JP7019488B2 - Injection molding machine - Google Patents

Description

The present invention relates to an injection molding machine.

The injection molding machine described in Patent Document 1 is for a rotary table held so as to be rotatable on a fixed plate, a plurality of fixed dies arranged at equal angles on the rotary table, and a fixed mold. It has a movable mold that can move up and down. The injection molding machine intermittently rotates the rotary table to sequentially inject and fill the mold placed at the injection position. This injection molding machine has a safety door that can be opened and closed on one side of the space where the movable mold moves up and down. When the safety door is opened, the movement of the movable mold in the mold closing direction is mechanically locked.

Japanese Unexamined Patent Publication No. 2006-347017

When the safety door is provided, it is necessary to open and close the safety door every time the worker takes out the molded product from the mold, which is complicated. Therefore, an opening that is always open to the outside is provided on one surface of the space where the movable mold moves up and down, and an intrusion detector (for example, a light curtain) that detects an object that invades from the outside to the inside through the opening. May be provided. If the intrusion detector detects the intrusion of an object during mold closing, the mold closing is interrupted. Therefore, it is possible to prevent a part of the worker's body from being pinched between the member that moves while the mold is closed (for example, a movable mold) and the member that does not move while the mold is closed (for example, a fixed mold).

Conventionally, when the intrusion detector detects the intrusion of an object during mold closing, the mold closing is interrupted. Therefore, the worker could not take out the molded product while the mold was closed, and the molded product was taken out after waiting for the completion of the mold closing. Therefore, there is a problem that a wasteful waiting time occurs and the molding cycle time becomes long.

One aspect of the embodiment is that the worker can take out the molded product while the mold is closed, and a part of the worker's body is between a member that moves during the mold closing and a member that does not move during the mold closing. The main purpose is to be able to prevent the pinching.

The injection molding machine of one aspect of the embodiment is
An injection molding machine having a mold clamping device for mold-clamping an upper mold and a lower mold.
The mold clamping device is
The upper platen to which the upper mold is attached and
A rotary table to which the plurality of lower molds can be attached, and
A lower platen that rotatably supports the rotary table from below,
A rotation mechanism that rotates the rotary table and
It has an elevating mechanism for elevating and lowering the upper platen.
The mold clamping device is
A mold clamping area in which the upper mold and one lower mold are clamped by raising and lowering the upper platen.
A molded product take-out area in which the molded product molded in the mold clamping area is taken out is formed.
A safety cover is provided between the mold clamping area and the molded product take-out area to limit the intrusion from the molded product take-out area into the mold clamping area .
The safety cover has a lower cover attached to the upper surface of the rotary table and rotating with the rotary table, and an upper cover provided above the lower cover and fixed to the lower platen .

According to one embodiment of the embodiment, the worker can take out the molded product while the mold is closed, and the member of the worker's body is between a member that moves during the mold closing and a member that does not move during the mold closing. It is possible to prevent a part from being pinched.

FIG. 1 is a diagram showing a state at the time of completion of mold opening of an injection molding machine according to an embodiment. FIG. 2 is a diagram showing a state at the time of mold clamping of the injection molding machine according to the embodiment. FIG. 3 is a perspective view showing an injection molding machine according to an embodiment. FIG. 4 is a plan view showing the mold clamping device shown in FIG. FIG. 5 is a front view showing a part of the mold clamping device shown in FIG. FIG. 6 is a plan view showing a mold clamping device when the rotary table shown in FIG. 4 is rotated by 90 ° and the safety door is opened. FIG. 7 is a front view showing a part of the mold clamping device shown in FIG. FIG. 8 is a flowchart showing a molding operation when the safety cover according to the embodiment does not exist at the mounting position. FIG. 9 is a flowchart showing a molding operation when the safety cover according to the embodiment is present at the mounting position. FIG. 10 is a perspective view showing a state when the mold closing of the safety cover is completed according to the modified example. FIG. 11 is a perspective view of the safety cover shown in FIG. 10 as viewed from an angle different from that of FIG. FIG. 12 is a diagram showing the first fixing guide shown in FIG. 11 in a broken state. FIG. 13 is a diagram showing the second fixing guide shown in FIG. 11 in a broken state. FIG. 14 is a plan view showing a mold clamping device on which the safety cover shown in FIG. 10 is mounted. FIG. 15 is a front view showing a part of the mold clamping device shown in FIG. FIG. 16 is a flowchart showing the processing of the control device during mold closing when the safety cover shown in FIG. 10 is present at the mounting position.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In each drawing, the same or corresponding configurations are designated by the same or corresponding reference numerals and the description thereof will be omitted.

(Injection molding machine)
FIG. 1 is a diagram showing a state at the time of completion of mold opening of an injection molding machine according to an embodiment. FIG. 2 is a diagram showing a state at the time of mold clamping of the injection molding machine according to the embodiment. In FIGS. 1 and 2, the X direction, the Y direction, and the Z direction are perpendicular to each other. The X and Y directions represent the horizontal direction, and the Z direction represents the vertical direction. When the mold clamping device 100 is a vertical mold, the Z direction is the mold opening / closing direction. As shown in FIGS. 1 to 2, the injection molding machine 10 includes a mold clamping device 100, an ejector device 200, an injection device 300, a moving device 400, a control device 700, and a frame 900. Hereinafter, each component of the injection molding machine 10 will be described.

(Molding device)
The mold clamping device 100 closes, molds, and opens the mold of the mold device 800. The mold clamping device 100 is, for example, a vertical mold, and the mold opening / closing direction is the vertical direction. The mold clamping device 100 includes an upper platen 110, a lower platen 120, a toggle support 130, a tie bar 140, a toggle mechanism 150, a mold clamping motor 160, a motion conversion mechanism 170, and a mold thickness adjusting mechanism 180.

The upper platen 110 is arranged above the lower platen 120 and is movable up and down with respect to the frame 900. The upper mold 810 is attached to the surface (lower surface) of the upper platen 110 facing the lower platen 120.

The lower platen 120 is fixed to the frame 900. A plurality of lower molds 820 are attached to the facing surface (upper surface) of the lower platen 120 with the upper platen 110 via the rotary table 121. The mold device 800 is composed of the upper mold 810 and the lower mold 820.

The lower platen 120 rotatably supports the rotary table 121 from below. A plurality of (for example, two) lower molds 820 are attached to the rotary table 121. When the rotary table 121 is rotated by 180 °, the lower mold 820 moves between the position facing the upper mold 810 and the position where the molded product is taken out. The position for taking out the molded product may also serve as the setup position for setting the insert material in the lower mold 820. The number of lower molds 820 is not limited to two, and may be one or three or more.

The toggle support 130 is movable up and down with respect to the frame 900 below the lower platen 120 and is connected to the upper platen 110. By raising and lowering the toggle support 130, the upper platen 110 is moved up and down.

The tie bar 140 connects the upper platen 110 and the toggle support 130 at intervals L in the mold opening / closing direction. A plurality of (for example, three) tie bars 140 may be used. Each tie bar 140 is parallel to the mold opening / closing direction and extends according to the mold clamping force. At least one tie bar 140 may be provided with a tie bar strain detector 141 that detects the distortion of the tie bar 140. The tie bar strain detector 141 sends a signal indicating the detection result to the control device 700. The detection result of the tie bar strain detector 141 is used for detecting the mold clamping force and the like.

In the present embodiment, the tie bar strain detector 141 is used as the mold clamping force detector for detecting the mold clamping force, but the present invention is not limited to this. The mold clamping force detector is not limited to the strain gauge type, and may be a piezoelectric type, a capacitive type, a hydraulic type, an electromagnetic type, or the like, and the mounting position thereof is not limited to the tie bar 140.

The toggle mechanism 150 is disposed between the lower platen 120 and the toggle support 130, and raises and lowers the toggle support 130 with respect to the lower platen 120. The toggle mechanism 150 is composed of a crosshead 151, a pair of links, and the like. Each link group has a first link 152 and a second link 153 that are flexibly connected by a pin or the like. The first link 152 is swingably attached to the lower platen 120 with a pin or the like, and the second link 153 is swingably attached to the toggle support 130 with a pin or the like. The second link 153 is attached to the crosshead 151 via the third link 154. When the crosshead 151 is moved up and down relative to the toggle support 130, the first link 152 and the second link 153 bend and stretch, and the toggle support 130 is moved up and down with respect to the lower platen 120.

The configuration of the toggle mechanism 150 is not limited to the configuration shown in FIGS. 1 and 2. For example, in FIGS. 1 and 2, the number of nodes in each link group is 5, but it may be 4, and one end of the third link 154 is connected to the nodes of the first link 152 and the second link 153. May be done.

The mold clamping motor 160 operates the toggle mechanism 150. The mold clamping motor 160 bends and stretches the first link 152 and the second link 153 by raising and lowering the crosshead 151 relative to the toggle support 130, and raises and lowers the upper platen 110. The mold clamping motor 160 is connected to the motion conversion mechanism 170 via a belt, a pulley, or the like, but may be directly connected to the motion conversion mechanism 170.

The motion conversion mechanism 170 converts the rotational motion of the mold clamping motor 160 into a linear motion of the crosshead 151. The motion conversion mechanism 170 includes a screw shaft 171 and a screw nut 172 screwed onto the screw shaft 171. A ball or roller may be interposed between the screw shaft 171 and the screw nut 172.

The mold clamping motor 160 is attached to the toggle support 130, the screw shaft 171 is rotatably supported by the toggle support 130, and the screw nut 172 is fixed to the crosshead 151. When the mold clamping motor 160 is driven to rotate the screw shaft 171, the screw nut 172 and the crosshead 151 are moved up and down relative to the toggle support 130. As a result, the first link 152 and the second link 153 are bent and stretched, and the toggle support 130 is moved up and down.

Although the mold clamping motor 160 of this embodiment is attached to the toggle support 130, it may be attached to the frame 900. In this case, the upper end of the screw shaft 171 is rotatably supported by the crosshead 151, the lower end of the screw shaft 171 is spline-coupled to a rotating member rotatably held by the frame 900, and the screw nut 172 is a toggle support 130. May be fixed to. When the mold clamping motor 160 is driven to rotate the rotating member, the screw shaft 171 moves up and down while rotating, and the crosshead 151 moves up and down relative to the toggle support 130. As a result, the first link 152 and the second link 153 are bent and stretched, and the toggle support 130 is moved up and down.

The mold clamping device 100 performs a mold closing step, a mold clamping step, a mold opening step, and the like under the control of the control device 700.

In the mold closing process, the upper platen 110 is lowered by driving the mold clamping motor 160 to raise the crosshead 151 relative to the toggle support 130 to the mold closing completion position at a set speed, and the upper mold 810 is moved. Touch the lower mold 820. The position and speed of the crosshead 151 are detected by using, for example, a mold clamping motor encoder 161. The mold clamping motor encoder 161 detects the rotation of the mold clamping motor 160, and sends a signal indicating the detection result to the control device 700. The crosshead position detector that detects the position of the crosshead 151 and the crosshead speed detector that detects the speed of the crosshead 151 are not limited to the mold clamping motor encoder 161 and general ones can be used. Further, the movable platen position detector that detects the position of the movable platen (upper platen 110 in this embodiment) and the movable platen speed detector that detects the speed of the movable platen are not limited to the mold clamping motor encoder 161 and are generally used. Can be used.

In the mold clamping step, the mold clamping force is generated by further driving the mold clamping motor 160 to raise the crosshead 151 relative to the toggle support 130 from the mold closing completion position to the mold clamping position. At the time of mold clamping, a cavity space 801 (see FIG. 2) is formed between the upper mold 810 and the lower mold 820, and the injection device 300 fills the cavity space 801 with a liquid molding material. A molded product is obtained by solidifying the filled molding material. The number of cavity spaces 801 may be plural, in which case a plurality of molded articles can be obtained at the same time.

In the mold opening process, the upper platen 110 is raised and the upper mold 810 is raised by driving the mold clamping motor 160 and lowering the crosshead 151 relative to the toggle support 130 to the mold opening completion position at a set speed. Separate from the lower mold 820. After that, the rotary table 121 is rotated, and the ejector device 200 projects the molded product from the lower mold 820 located at the position where the molded product is taken out.

The setting conditions in the mold closing process and the mold clamping process are collectively set as a series of setting conditions. For example, the speed and position of the crosshead 151 (including the mold closing start position, speed switching position, mold closing completion position, and mold clamping position) and the mold clamping force in the mold closing process and the mold clamping process are set as a series of setting conditions. , Set together. The mold closing start position, speed switching position, mold closing completion position, and mold closing position are arranged in this order from the lower side to the upper side, and represent the start point and the end point of the section in which the speed is set. The speed is set for each section. The speed switching position may be one or a plurality. The speed switching position does not have to be set. Only one of the mold clamping position and the mold clamping force may be set.

The setting conditions in the mold opening process are also set in the same manner. For example, the speed and position (including the mold opening start position, the speed switching position, and the mold opening completion position) of the crosshead 151 in the mold opening process are collectively set as a series of setting conditions. The mold opening start position, speed switching position, and mold opening completion position are arranged in this order from the upper side to the lower side, and represent the start point and the end point of the section in which the speed is set. The speed is set for each section. The speed switching position may be one or a plurality. The speed switching position does not have to be set. The mold opening start position and the mold clamping position may be the same position. Further, the mold opening completion position and the mold closing start position may be the same position.

Instead of the speed and position of the crosshead 151, the speed and position of the movable platen (upper platen 110 in this embodiment) may be set. Further, the mold clamping force may be set instead of the position of the crosshead (for example, the mold clamping position) or the position of the movable platen.

By the way, the toggle mechanism 150 amplifies the driving force of the mold clamping motor 160 and transmits it to the upper platen 110. The amplification factor is also called the toggle magnification. The toggle magnification changes according to the angle θ between the first link 152 and the second link 153 (hereinafter, also referred to as “link angle θ”). The link angle θ is obtained from the position of the crosshead 151. When the link angle θ is 180 °, the toggle magnification is maximized.

When the thickness of the mold device 800 changes due to replacement of the mold device 800 or a temperature change of the mold device 800, the mold thickness is adjusted so that a predetermined mold clamping force can be obtained at the time of mold clamping. In the mold thickness adjustment, for example, the distance L between the upper platen 110 and the toggle support 130 is set so that the link angle θ of the toggle mechanism 150 becomes a predetermined angle at the time of the mold touch when the upper mold 810 touches the lower mold 820. To adjust.

The mold clamping device 100 has a mold thickness adjusting mechanism 180 that adjusts the mold thickness by adjusting the distance L between the upper platen 110 and the toggle support 130. The mold thickness adjusting mechanism 180 is a mold that rotates a screw shaft 181 formed at the lower end of the tie bar 140, a screw nut 182 rotatably held by the toggle support 130, and a screw nut 182 screwed to the screw shaft 181. It has a thickness adjusting motor 183.

The screw shaft 181 and the screw nut 182 are provided for each tie bar 140. The rotation of the mold thickness adjusting motor 183 may be transmitted to the plurality of screw nuts 182 via the rotation transmission unit 185. A plurality of screw nuts 182 can be rotated synchronously. By changing the transmission path of the rotation transmission unit 185, it is possible to rotate the plurality of screw nuts 182 individually.

The rotation transmission unit 185 is composed of, for example, a gear or the like. In this case, a passive gear is formed on the outer circumference of each screw nut 182, a drive gear is attached to the output shaft of the mold thickness adjusting motor 183, and a plurality of passive gears and an intermediate gear that meshes with the drive gear are located at the center of the toggle support 130. It is held rotatably. The rotation transmission unit 185 may be composed of a belt, a pulley, or the like instead of the gear.

The operation of the mold thickness adjusting mechanism 180 is controlled by the control device 700. The control device 700 drives the mold thickness adjusting motor 183 to rotate the screw nut 182, thereby adjusting the position of the toggle support 130 that holds the screw nut 182 rotatably with respect to the tie bar 140, and adjusts the position of the toggle support 130 with respect to the upper platen 110 and the toggle. Adjust the distance L from the support 130. A plurality of mold thickness adjusting mechanisms may be used in combination.

The interval L is detected by using the mold thickness adjusting motor encoder 184. The mold thickness adjusting motor encoder 184 detects the rotation amount and the rotation direction of the mold thickness adjusting motor 183, and sends a signal indicating the detection result to the control device 700. The detection result of the mold thickness adjustment motor encoder 184 is used for monitoring and controlling the position and interval L of the toggle support 130. The toggle support position detector for detecting the position of the toggle support 130 and the interval detector for detecting the interval L are not limited to the mold thickness adjustment motor encoder 184, and general ones can be used.

(Ejector device)
The ejector device 200 projects a molded product from the mold device 800. For example, the ejector device 200 projects the molded product from the lower mold 820 located at the position where the molded product is taken out. The ejector device 200 includes an ejector motor 210, a motion conversion mechanism 220, an ejector rod 230, and the like.

The ejector motor 210 is attached to the lower platen 120. The ejector motor 210 is directly connected to the motion conversion mechanism 220, but may be connected to the motion conversion mechanism 220 via a belt, a pulley, or the like.

The motion conversion mechanism 220 converts the rotational motion of the ejector motor 210 into a linear motion of the ejector rod 230. The motion conversion mechanism 220 includes a screw shaft and a screw nut screwed onto the screw shaft. A ball or roller may be interposed between the screw shaft and the screw nut.

The ejector rod 230 penetrates the lower platen 120 and the rotary table 121, and comes into contact with the movable member 830 disposed so as to be able to move up and down inside the lower mold 820. The ejector rod 230 retracts from the through hole of the rotary table 121 when the rotary table 121 rotates.

The ejector device 200 performs the ejection process under the control of the control device 700.

In the ejection step, the ejector motor 210 is driven to raise the ejector rod 230 from the standby position to the ejection position at a set speed, whereby the movable member 830 is raised and the molded product is ejected. After that, the ejector motor 210 is driven to lower the ejector rod 230 at a set speed, and the movable member 830 is lowered to the original standby position. The position and speed of the ejector rod 230 are detected by using, for example, the ejector motor encoder 211. The ejector motor encoder 211 detects the rotation of the ejector motor 210, and sends a signal indicating the detection result to the control device 700. The ejector rod position detector that detects the position of the ejector rod 230 and the ejector rod speed detector that detects the speed of the ejector rod 230 are not limited to the ejector motor encoder 211, and general ones can be used.

(Injection device)
The injection device 300 includes a slide base 302 that moves up and down along a guide 301 provided on the frame 900, and is moved up and down with respect to the upper platen 110. The injection device 300 touches the mold device 800 and fills the cavity space 801 in the mold device 800 with the molding material. The injection device 300 includes, for example, a cylinder 310, a nozzle 320, a screw 330, a measuring motor 340, an injection motor 350, a pressure detector 360, and the like.

The cylinder 310 heats the molding material supplied internally from the supply port 311. The molding material includes, for example, a resin. The molding material is formed, for example, in the form of pellets and is supplied to the supply port 311 in a solid state. The supply port 311 is formed on the upper part of the cylinder 310. A cooler 312 such as a water-cooled cylinder is provided on the outer periphery of the upper portion of the cylinder 310. Below the cooler 312, a heater 313 such as a band heater and a temperature detector 314 are provided on the outer periphery of the cylinder 310.

The cylinder 310 is divided into a plurality of zones in the axial direction of the cylinder 310 (vertical direction in FIGS. 1 and 2). A heater 313 and a temperature detector 314 are provided in each zone. The control device 700 controls the heater 313 so that the detection temperature of the temperature detector 314 becomes the set temperature for each zone.

The nozzle 320 is provided at the lower end of the cylinder 310 and is pressed against the mold device 800. A heater 313 and a temperature detector 314 are provided on the outer periphery of the nozzle 320. The control device 700 controls the heater 313 so that the detected temperature of the nozzle 320 becomes the set temperature.

The screw 330 is rotatably and vertically movable in the cylinder 310. When the screw 330 is rotated, the molding material is fed downward along the spiral groove of the screw 330. The molding material is gradually melted by the heat from the cylinder 310 while being fed downward. As the liquid molding material is fed below the screw 330 and accumulated in the lower part of the cylinder 310, the screw 330 is raised. After that, when the screw 330 is lowered, the liquid molding material accumulated under the screw 330 is ejected from the nozzle 320 and filled in the mold apparatus 800.

A backflow prevention ring 331 is movably attached to the lower portion of the screw 330 as a backflow prevention valve for preventing backflow of the molding material from the lower side to the upper side of the screw 330 when the screw 330 is pushed downward.

When the backflow prevention ring 331 is lowered, the backflow prevention ring 331 is pushed upward by the pressure of the molding material below the screw 330, and is relative to the screw 330 up to the closing position (see FIG. 2) that blocks the flow path of the molding material. Rise. This prevents the molding material accumulated under the screw 330 from flowing back upward.

On the other hand, the backflow prevention ring 331 is pushed downward by the pressure of the molding material sent downward along the spiral groove of the screw 330 when the screw 330 is rotated, and the opening position opens the flow path of the molding material. It descends relative to the screw 330 to (see FIG. 1). As a result, the molding material is sent below the screw 330.

The backflow prevention ring 331 may be either a co-rotating type that rotates with the screw 330 or a non-co-rotating type that does not rotate with the screw 330.

The injection device 300 may have a drive source for raising and lowering the backflow prevention ring 331 between the open position and the closed position with respect to the screw 330.

The metering motor 340 rotates the screw 330. The drive source for rotating the screw 330 is not limited to the metering motor 340, and may be, for example, a hydraulic pump.

The injection motor 350 raises and lowers the screw 330. Between the injection motor 350 and the screw 330, a motion conversion mechanism or the like for converting the rotational motion of the injection motor 350 into the linear motion of the screw 330 is provided. The motion conversion mechanism has, for example, a screw shaft and a screw nut screwed to the screw shaft. A ball, a roller, or the like may be provided between the screw shaft and the screw nut. The drive source for raising and lowering the screw 330 is not limited to the injection motor 350, and may be, for example, a hydraulic cylinder.

The pressure detector 360 detects the pressure transmitted between the injection motor 350 and the screw 330. The pressure detector 360 is provided in the force transmission path between the injection motor 350 and the screw 330 and detects the pressure acting on the pressure detector 360.

The pressure detector 360 sends a signal indicating the detection result to the control device 700. The detection result of the pressure detector 360 is used for controlling and monitoring the pressure received by the screw 330 from the molding material, the back pressure on the screw 330, the pressure acting on the molding material from the screw 330, and the like.

The injection device 300 performs a weighing step, a filling step, a pressure holding step, and the like under the control of the control device 700.

In the weighing process, the weighing motor 340 is driven to rotate the screw 330 at a set rotation speed, and the molding material is fed downward along the spiral groove of the screw 330. Along with this, the molding material is gradually melted. As the liquid molding material is fed below the screw 330 and accumulated in the lower part of the cylinder 310, the screw 330 is raised. The rotation speed of the screw 330 is detected by using, for example, a measuring motor encoder 341. The metering motor encoder 341 detects the rotation of the metering motor 340 and sends a signal indicating the detection result to the control device 700. The screw rotation speed detector that detects the rotation speed of the screw 330 is not limited to the metering motor encoder 341, and a general screw can be used.

In the weighing process, the injection motor 350 may be driven to apply a set back pressure to the screw 330 in order to limit the sudden rise of the screw 330. The back pressure on the screw 330 is detected using, for example, a pressure detector 360. The pressure detector 360 sends a signal indicating the detection result to the control device 700. When the screw 330 rises to the weighing completion position and a predetermined amount of molding material is accumulated under the screw 330, the weighing process is completed.

In the filling step, the injection motor 350 is driven to lower the screw 330 at a set speed, and the liquid molding material accumulated under the screw 330 is filled in the cavity space 801 in the mold apparatus 800. The position and speed of the screw 330 are detected using, for example, an injection motor encoder 351. The injection motor encoder 351 detects the rotation of the injection motor 350 and sends a signal indicating the detection result to the control device 700. When the position of the screw 330 reaches the set position, switching from the filling process to the pressure holding process (so-called V / P switching) is performed. The position where V / P switching is performed is also called the V / P switching position. The set speed of the screw 330 may be changed according to the position and time of the screw 330.

After the position of the screw 330 reaches the set position in the filling step, the screw 330 may be temporarily stopped at the set position, and then V / P switching may be performed. Immediately before the V / P switching, instead of stopping the screw 330, the screw 330 may be lowered or increased at a slow speed. Further, the screw position detector for detecting the position of the screw 330 and the screw speed detector for detecting the speed of the screw 330 are not limited to the injection motor encoder 351 and general ones can be used.

In the pressure holding step, the injection motor 350 is driven to push the screw 330 downward, and the pressure of the molding material (hereinafter, also referred to as “holding pressure”) at the lower end of the screw 330 is maintained at a set pressure in the cylinder 310. The remaining molding material is pushed toward the mold device 800. The shortage of molding material due to cooling shrinkage in the mold apparatus 800 can be replenished. The holding pressure is detected using, for example, a pressure detector 360. The pressure detector 360 sends a signal indicating the detection result to the control device 700. The set value of the holding pressure may be changed according to the elapsed time from the start of the holding pressure step and the like.

In the pressure holding step, the molding material in the cavity space 801 in the mold apparatus 800 is gradually cooled, and when the pressure holding step is completed, the inlet of the cavity space 801 is closed with the solidified molding material. This state is called a gate seal, and the backflow of the molding material from the cavity space 801 is prevented. After the pressure holding step, the cooling step is started. In the cooling step, the molding material in the cavity space 801 is solidified. A weighing step may be performed during the cooling step to reduce the molding cycle time.

The injection device 300 of the present embodiment is an in-line screw system, but may be a pre-plastic system or the like. The pre-plastic injection device supplies the molded material melted in the plasticized cylinder to the injection cylinder, and injects the molding material from the injection cylinder into the mold device. A screw is rotatably or rotatably arranged in the plastic cylinder so as to be able to move up and down, and a plunger is rotatably arranged in the injection cylinder.

Further, the injection device 300 of the present embodiment is a vertical type in which the axial direction of the cylinder 310 is in the vertical direction, but may be a horizontal type in which the axial direction of the cylinder 310 is in the horizontal direction.

(Mobile device)
The moving device 400 raises and lowers the injection device 300 with respect to the frame 900. Further, the moving device 400 presses the nozzle 320 against the mold device 800 to generate a nozzle touch pressure. The moving device 400 includes an injection device moving motor 410, a motion conversion mechanism 420 that converts the rotational motion of the ejection device moving motor 410 into a linear motion (elevating motion) of the ejection device 300, and the like. The motion conversion mechanism 420 includes a screw shaft 421 and a screw nut 422 screwed onto the screw shaft 421. A ball or roller may be interposed between the screw shaft 421 and the screw nut 422.

For example, the injection device moving motor 410 is attached to the slide base 302, the screw shaft 421 is rotatably supported with respect to the slide base 302, and the screw nut 422 is fixed to the upper platen 110. When the screw shaft 421 is rotated by driving the injection device moving motor 410, the screw shaft 421 moves up and down, and the injection device 300 moves up and down with respect to the upper platen 110.

Although the injection device moving motor 410 of the present embodiment is attached to the slide base 302, it may be attached to the upper platen 110. In this case, the screw shaft 421 may be rotatably supported with respect to the upper platen 110, and the screw nut 422 may be fixed to the slide base 302. When the screw shaft 421 is rotated by driving the injection device moving motor 410, the screw nut 422 moves up and down, and the injection device 300 moves up and down with respect to the upper platen 110.

(Control device)
The control device 700 is composed of, for example, a computer, and has a CPU (Central Processing Unit) 701, a storage medium 702 such as a memory, an input interface 703, and an output interface 704 as shown in FIGS. 1 to 2. The control device 700 performs various controls by causing the CPU 701 to execute the program stored in the storage medium 702. Further, the control device 700 receives a signal from the outside through the input interface 703 and transmits the signal to the outside through the output interface 704.

The control device 700 repeatedly manufactures a molded product by repeatedly performing a mold closing step, a mold clamping step, a mold opening step, and the like. Further, the control device 700 performs a weighing step, a filling step, a pressure holding step, and the like during the mold clamping step. A series of operations for obtaining a molded product, for example, an operation from the start of a weighing process to the start of the next weighing process is also referred to as a "shot" or a "molding cycle". Further, the time required for one shot is also referred to as "molding cycle time".

A single molding cycle has, for example, a weighing step, a mold closing step, a molding step, a filling step, a pressure holding step, a cooling step, a mold opening step, and a protrusion step in this order. The order here is the order of starting each process. The filling step, the pressure holding step, and the cooling step are performed from the start of the mold clamping step to the end of the mold clamping step. The end of the mold clamping process coincides with the start of the mold opening process. In addition, in order to shorten the molding cycle time, a plurality of steps may be performed at the same time. For example, the weighing step may be performed during the cooling step of the previous molding cycle, in which case the mold closing step may be performed at the beginning of the molding cycle. Further, the filling step may be started during the mold closing step. Further, the ejection process may be started during the mold opening process. If an on-off valve that opens and closes the flow path of the nozzle 320 is provided, the mold opening step may be started during the weighing step. This is because even if the mold opening process is started during the weighing process, the molding material does not leak from the nozzle 320 if the on-off valve closes the flow path of the nozzle 320.

The control device 700 is connected to the operation device 750 and the display device 760. The operation device 750 receives an input operation by the user and outputs a signal corresponding to the input operation to the control device 700. The display device 760 displays an operation screen corresponding to an input operation in the operation device 750 under the control of the control device 700.

The operation screen is used for setting the injection molding machine 10 and the like. Multiple operation screens are prepared, and they can be switched and displayed or displayed in layers. The user sets the injection molding machine 10 (including input of a set value) by operating the operation device 750 while looking at the operation screen displayed on the display device 760.

The operating device 750 and the display device 760 may be composed of, for example, a touch panel and may be integrated. Although the operation device 750 and the display device 760 of the present embodiment are integrated, they may be provided independently. Further, a plurality of operating devices 750 may be provided.

(Removal of molded product)
FIG. 3 is a perspective view showing an injection molding machine according to an embodiment. FIG. 4 is a plan view showing the mold clamping device shown in FIG. FIG. 5 is a front view showing a part of the mold clamping device shown in FIG. FIG. 6 is a plan view showing a mold clamping device when the rotary table shown in FIG. 4 is rotated by 90 ° and the safety door is opened. FIG. 7 is a front view showing a part of the mold clamping device shown in FIG.

The mold clamping device 100 molds the upper mold 810 and the lower mold 820. The mold clamping device 100 has an upper platen 110 to which the upper mold 810 is attached, a rotary table 121 to which a plurality of lower molds 820 are attached, and a lower platen 120 that rotatably supports the rotary table 121 from below. The lower platen 120 is fixed to the frame 900, and the upper platen 110 can be raised and lowered above the rotary table 121. A plurality of lower molds 820 are attached to the upper surface of the rotary table 121. The plurality of lower molds 820 are arranged at equal pitches around the rotation center 122 of the rotary table 121. On the other hand, on the lower surface of the upper platen 110, one lower mold 820 and one upper mold 810 arranged to face each other are attached.

The rotary table 121 is horizontally arranged above the lower platen 120. A circular fixed core 124 (see FIG. 4) is provided at the rotation center 122 of the rotary table 121. The fixed core 124 is fixed to the lower platen 120 and does not rotate together with the rotary table 121. A fixed pillar 125 extending in the Z direction is attached to the upper surface of the fixed core 124.

In addition to the lower mold 820, the piping connector 126 is fixed to the upper surface of the rotary table 121. The piping connector 126 rotates together with the rotary table 121. One end of the pipe is connected to the connection port 127 (see FIG. 5) of the pipe connector 126, and the other end of the pipe is connected to the connection port of the lower mold 820. As the piping, for example, a supply pipe that supplies a heat medium (refrigerant or heat medium) such as water that regulates the temperature of the lower mold 820 to the inside of the lower mold 820, and a heat medium from the inside of the lower mold 820 to the outside. Examples include a discharge pipe for discharging. The middle portion of these pipes is attached to the fixed column 125.

Further, in addition to the lower mold 820, the wiring connector 128 is fixed to the upper surface of the rotary table 121. The wiring connector 128 is provided on the side opposite to the piping connector 126 with the fixed core 124 interposed therebetween, and rotates together with the rotary table 121. One end of the wiring is connected to the connection port 129 (see FIG. 5) of the wiring connector 128, and the other end of the wiring is connected to the connection port of the lower mold 820. Examples of the wiring include a strong electric wire that supplies electric power to a heater that heats the lower mold 820, a weak electric wire that transmits an electric signal from a thermocouple that measures the temperature of the lower mold 820, and the like.

The mold clamping device 100 has an elevating mechanism 190 (see FIG. 4) for elevating and lowering the upper platen 110. The elevating mechanism 190 raises and lowers the upper mold 810 by raising and lowering the upper platen 110. The elevating mechanism 190 includes, for example, a toggle mechanism 150, a mold clamping motor 160, and a motion conversion mechanism 170 shown in FIGS. 1 and 2.

The elevating mechanism 190 raises and lowers the upper platen 110 under the control of the control device 700. For example, by lowering the upper platen 110 from the mold closing start position to the mold closing completion position, the mold is closed and the upper mold 810 is brought into contact with the lower mold 820. Subsequently, the upper platen 110 is further lowered from the mold closing completion position to the mold clamping position to perform mold clamping. A cavity space 801 (see FIG. 2) is formed between the upper mold 810 and the lower mold 820 in the mold-clamped state. A molded product is obtained by filling the cavity space 801 with a liquid molding material and cooling and solidifying the filled molding material. After that, the mold is opened by raising the upper platen 110 from the mold clamping position to the mold opening completion position. The mold opening completion position and the mold closing start position are the same positions.

The mold clamping device 100 has a rotation mechanism 123 (see FIG. 4) for rotating the rotary table 121. The rotation mechanism 123 includes a rotation motor, and the rotation driving force of the rotation motor is transmitted to the rotation table 121 by a timing belt, gears, or the like. The rotation mechanism 123 rotates the rotary table 121 for the replacement of the lower mold 820 located at the mold clamping position P1 and the replacement of the lower mold 820 located at the molded product take-out position P2.

As shown in FIG. 4, for example, two lower molds 820 are attached to the rotary table 121 at a pitch of 180 °. Every time the rotary table 121 is rotated by 180 °, the lower mold 820 located at the mold clamping position P1 is replaced and the lower mold 820 located at the molded product take-out position P2 is replaced. The rotation direction of the rotary table 121 may be only one direction, or may be switched alternately in one direction and the opposite direction. The rotation of the rotary table 121 is performed in the mold open state, and is performed under the control of the control device 700.

The upper mold 810 is in contact with the lower mold 820 located at the mold clamping position P1. A cavity space 801 for molding a molded product is formed between the upper mold 810 and the lower mold 820 in the mold-clamped state. On the other hand, the molded product is taken out from the lower mold 820 located at the molded product take-out position P2. The molded product take-out position P2 may also serve as a setup position. The setup position is a position where the insert material is set in the lower mold 820 from which the molded product is taken out.

The lower mold 820 in which the insert material is set is moved from the molded product take-out position P2 to the mold clamping position P1. The upper mold 810 is abutted against the lower mold 820 located at the mold clamping position P1, and the insert material is arranged in a part of the cavity space 801. By filling the other part of the cavity space 801 with the molding material, a molded product containing the insert material can be obtained. The insert material may be formed of the same material as the molding material (for example, resin), or may be formed of a material different from the molding material (for example, metal).

The number of lower molds 820 is two in the present embodiment, but may be three or more. When the number of lower molds 820 is three or more, a temporary stop position different from the mold clamping position P1 and the molded product take-out position P2 may be provided. For example, the molded product take-out position P2 and the setup position may be provided separately. In this case, the lower mold 820 is temporarily stopped at the setup position while moving from the molded product take-out position P2 to the mold clamping position P1.

By the way, as shown in FIG. 3, the mold clamping device 100 has four side panels 101 to 104 extending upward from the outer edge portion of the rectangular lower platen 120. Of the four side panels 101 to 104, the two side panels 102 and 104 facing in the Y direction have a safety door 191 and a safety door frame to which the safety door 191 is attached, respectively, as shown in FIGS. 4 and 6, respectively. Includes 199 and. The safety door frame 199 is fixed to the lower platen 120.

The safety door 191 has, for example, a sliding door 192 and a revolving door 193. The slide door 192 is attached to the safety door frame 199 via a guide 194 that expands and contracts in the X direction, and is slidable in the X direction. On the other hand, the revolving door 193 is attached to the slide door 192 with a hinge 195 or the like, and is rotatable around the hinge 195.

When the sliding door 192 is slid from the closed position shown in FIG. 4 to the open position shown in FIG. 6, and / or the revolving door 193 is rotated from the closed position shown in FIG. 4 toward the open position shown in FIG. If so, the control device 700 interrupts all molding operations of the injection molding machine 10. All molding operations of the injection molding machine 10 are allowed only when the slide door 192 is located in the closed position shown in FIG. 4 and the revolving door 193 is located in the closed position shown in FIG.

When the sliding door 192 is located in the open position shown in FIG. 6 and the revolving door 193 is located in the open position shown in FIG. 6, the lower mold 820 is replaced (removed and attached) from both sides of the rotary table 121 in the Y direction. Work) is possible, and the replacement work of one lower mold 820 and the replacement work of the other lower mold 820 can be carried out at the same time. These replacement operations are performed after removing the safety cover 500, which will be described later. By removing the safety cover 500, the lower mold 820 can be suspended by a crane without catching the lower mold 820 on the safety cover 500. The rotation angle of the rotary table 121 (see FIG. 6) when these replacement operations are performed is shifted by 90 ° with respect to the rotation angle of the rotary table 121 (see FIG. 4) when the molded product is manufactured.

The rotation angle of the rotary table 121 may be the same when the lower mold 820 is replaced and when the molded product is manufactured. In this case, the lower mold 820 is replaced in the molded product take-out area A1 described later. Since the safety cover 500 is provided at the boundary between the molded product take-out area A1 and the mold clamping area A2 as described later, the safety cover 500 is not removed when the lower mold 820 is replaced in the molded product take-out area A1. However, it is possible to suspend the lower mold 820 with a crane without catching the lower mold 820 on the safety cover 500. When the replacement work of one lower mold 820 is completed, the rotary table 121 is rotated by 180 °, and the replacement work of the other lower mold 820 is performed.

Of the remaining two side panels 101 and 103 facing in the X direction, one side panel 101 is provided with an opening 105. As shown in FIG. 3, the opening 105 is formed in the side panel 101 to which the operation device 750 and the display device 760 are attached. The operator can easily access the lower mold 820 located at the molded product take-out position P2 through the opening 105, and can easily take out the molded product from the lower mold 820.

Inside surrounded by the four side panels 101 to 104, a mold clamping area A2 in which the upper mold 810 and one lower mold 820 are molded by raising and lowering the upper platen 110, and a mold clamping area A2 are formed. A molded product take-out area A1 in which the molded product is taken out from the other lower mold 820 is formed. The mold clamping area A2 is provided on the side opposite to the opening 105 of the side panel 101 (on the negative direction side in the X direction) with the molded product take-out area A1 as a reference. The opening 105 is always open. Therefore, for example, during the rotation of the rotary table 121, an operator can mistakenly enter the molded product take-out area A1 through the opening 105.

Therefore, the mold clamping device 100 has a molded product take-out area intrusion detector 710 that detects an object that invades the molded product take-out area A1 from the opening 105 of the side panel 101. The molded product take-out area intrusion detector 710 is, for example, a light curtain, and as shown in FIG. 4, includes a floodlight 711 such as an LED and a light receiver 712 that receives light from the floodlight 711. The floodlight 711 and the light receiver 712 are provided so as to sandwich the opening 105 in the Y direction.

As shown in FIG. 3, a first mounting portion 713 extending linearly in the Z direction is provided at the end portion of the opening 105 on the negative direction side in the Y direction. On the other hand, at the end of the opening 105 on the positive direction side in the Y direction, a second mounting portion 714 extending linearly in the Z direction is provided. A floodlight 711 and a light receiver 712 (only one of which is shown in FIGS. 4 and 6) are attached to the first attachment portion 713 and the second attachment portion 714, respectively. The floodlight 711 and the light receiver 712 are arranged so as to be alternately and repeatedly arranged in the Z direction. It should be noted that a plurality of devices having both functions of the floodlight 711 and the light receiver 712 may be arranged at intervals in the Z direction.

The floodlight 711 irradiates a beam of light in the Y direction. The light receiver 712 receives the light from the floodlight 711 at the same height as the light receiver 712, and transmits a signal according to the amount of light received to the control device 700. When an object (for example, an operator) invades the molded product take-out area A1 from the opening 105 of the side panel 101, the object blocks the light from the floodlight 711, so that the amount of light received by the photoreceiver 712 becomes less than the threshold value.

Therefore, when the light receiving amount of the light receiving device 712 is less than the threshold value, the control device 700 determines that an object has entered the molded product taking-out area A1 from the opening 105 of the side panel 101. On the other hand, when the light receiving amount of the light receiving device 712 is equal to or larger than the threshold value, the control device 700 determines that no object has entered the molded product taking-out area A1 from the opening 105 of the side panel 101.

As will be described in detail later, when the control device 700 detects the intrusion of an object from the opening 105 of the side panel 101 into the molded product take-out area A1 while the rotary table 121 is rotating, the control device 700 interrupts the rotation of the rotary table 121. As a result, the rotation of the rotary table 121 is stopped halfway. Therefore, between the member that rotates with the rotary table 121 (for example, lower mold 820, piping connector 126, wiring connector 128) and the member that does not rotate with the rotary table 121 (for example, upper mold 810, tie bar 140), the operator It is possible to prevent a part of the body (for example, a hand) from being pinched.

In the present embodiment, both the floodlight 711 and the light receiver 712 are mounted on the first mounting portion 713, but only the floodlight 711 (or only the light receiver 712) may be mounted. Further, although both the floodlight 711 and the light receiver 712 are mounted on the second mounting portion 714 in the present embodiment, only the light receiver 712 (or only the floodlight 711) may be mounted.

By the way, since the opening 105 of the side panel 101 is always open, it is possible for an operator to invade the molded product take-out area A1 from the opening 105. Since there is no member (for example, upper platen 110 or upper mold 810) that moves during mold closing in the molded product take-out area A1, it is permissible for an operator to invade while the mold is closed. On the other hand, since there is a member that moves during the mold closing in the mold clamping area A2, the intrusion of the operator during the mold closing is restricted by the safety cover 500 described later.

The mold clamping device 100 includes a safety cover 500 between the mold clamping area A2 and the molded product take-out area A1 to limit the intrusion from the molded product take-out area A1 into the mold clamping area A2. The safety cover 500 restricts an object that has entered the molded product take-out area A1 through the opening 105 of the side panel 101 from further entering the mold clamping area A2. The safety cover 500 can limit the operator from entering the mold clamping area A2 while the mold is closed. As a result, it is possible to allow the operator to enter the molded product take-out area A1 through the opening 105 of the side panel 101 while the mold is closed. This is because there is no member (for example, the upper platen 110 or the upper mold 810) that moves while the mold is closed in the molded product take-out area A1. Therefore, as will be described in detail later, the mold closing and the taking out of the molded product can be performed in parallel, and the molding cycle time can be shortened.

The safety cover 500 has a lower cover 510 attached to the upper surface of the rotary table 121 and rotating together with the rotary table 121, and an upper cover 520 provided above the lower cover 510 and fixed to the lower platen 120. Since neither the lower cover 510 nor the upper cover 520 moves up and down as the upper platen 110 moves up and down, the gap between the lower cover 510 and the upper cover 520 does not open as the upper platen 110 moves up and down. Therefore, when the mold closing start position of the upper platen 110 is changed in the vertical direction along with the mold thickness adjustment, it is not necessary to replace or position the lower cover 510 and replace or position the upper cover 520. If the height of the safety cover 500 is higher than the upper limit of the height of the upper platen 110, it is possible to restrict the operator from entering the mold clamping area A2 while the mold is closed, regardless of the result of the mold thickness adjustment.

The lower cover 510 is provided on the upper surface of the rotary table 121, and is provided linearly from the inner peripheral portion of the rotary table 121 to the outer peripheral portion of the rotary table 121 in a vertical direction as shown in FIG. As shown in FIG. 4, a pair of lower covers 510 are provided so as to sandwich the fixed core 124 in a vertical direction, and each of them rotates together with the rotary table 121.

As shown in FIG. 5, the lower cover 510 includes a rectangular parallelepiped metal block 511 and a transparent resin plate 513 that covers the opening 512 of the metal block 511. While the worker is restricted from entering the mold clamping area A2 from the opening 512 of the metal block 511 while the mold is closed, the worker can see the state of the mold clamping area A2 from the opening 512 of the metal block 511 while the mold is closed. It can be visually recognized. Further, since the metal block 511 is used, the strength of the lower cover 510 can be ensured.

As shown in FIG. 5, a rectangular notch 514 is formed on the lower surface of the metal block 511. The piping connector 126 or the wiring connector 128 is inserted into the notch 514. The size of the notch 733 is slightly larger than the size of the member to be inserted (piping connector 126 or wiring connector 128).

The upper cover 520 has an upper cover main body portion 521 provided above the lower cover 510, a first mounting portion 525 attached to the safety door frame 199, and a second mounting portion 526 attached to the fixed pillar 125. The upper cover 520 is formed so that the lower cover 510 (see FIG. 5) and the lower mold 820 (see FIG. 7) can pass under the upper cover main body portion 521 when the rotary table 121 is rotated. As shown in FIG. 4, a pair of upper covers 520 are provided so as to sandwich the fixed core 124 in a vertical direction.

As shown in FIG. 4, the upper cover main body portion 521 is provided linearly from the inner peripheral portion of the rotary table 121 to the outer peripheral portion of the rotary table 121 in a vertical direction. As shown in FIG. 5, the upper cover main body portion 521 includes a metal plate 522 and a transparent resin plate 524 that covers the opening 523 of the metal plate 522. While the worker is restricted from entering the mold clamping area A2 from the opening 523 of the metal plate 522 while the mold is closed, the worker can see the state of the mold clamping area A2 from the opening 523 of the metal plate 522 while the mold is closed. It can be visually recognized. Further, since the metal plate 522 is used, the strength of the upper cover 520 can be ensured.

As shown in FIG. 5, the first mounting portion 525 projects downward from the upper cover main body portion 521 and closes the gap formed between the lower cover 510 and the safety door frame 199 (see FIG. 4). The first mounting portion 525 is composed of, for example, a flat plate.

The second mounting portion 526 projects downward from the upper cover main body portion 521 like the first mounting portion 525, and closes the gap formed between the lower cover 510 and the fixed pillar 125. The second mounting portion 526 is composed of, for example, a plate bent in a Z shape.

Although the upper cover 520 is attached to both the safety door frame 199 and the fixed pillar 125 in this embodiment, it may be attached to only one of them. Therefore, the upper cover 520 has both the first mounting portion 525 and the second mounting portion 526 in the present embodiment, but may have only one of them.

As shown in FIG. 4, the mold clamping device 100 includes a safety cover presence detector 530 that detects the presence of the safety cover 500 at the mounting position where the safety cover 500 is attached. The presence / absence of the safety cover 500 can be confirmed by the safety cover presence detector 530. When the safety cover 500 is not attached, an operator who has entered the molded product take-out area A1 through the opening 105 of the side panel 101 while the mold is closed can enter the mold clamping area A2 where the mold is closed. Therefore, when the safety cover 500 is not attached, the mold closing is interrupted when the operator enters the molded product take-out area A1 through the opening 105 of the side panel 101 during the mold closing. As a result, the work is performed between the member that moves while the mold is closed (for example, the upper platen 110 or the upper mold 810) and the member that does not move while the mold is closed (for example, the lower platen 120, the rotary table 121, or the lower mold 820). It is possible to prevent a part of a person's body (for example, a hand) from being pinched.

As shown in FIG. 4, the safety cover presence detector 530 has a lower cover presence detector 531 that detects the presence of the lower cover 510 at the mounting position where the lower cover 510 is attached. The lower cover presence detector 531 is, for example, a magnetic proximity sensor and includes a permanent magnet 532 fixed to the lower cover 510 and a magnetic detection element 533 fixed to the rotary table 121. The magnetic detection element 533 detects the proximity of the permanent magnet 532 by detecting the magnetism of the permanent magnet 532. The magnetic detection element 533 transmits a signal indicating the detection result to the control device 700. When the control device 700 detects the presence of the permanent magnet 532 by the magnetic detection element 533, the control device 700 determines that the lower cover 510 is present at the mounting position thereof. On the other hand, when the control device 700 detects the absence of the permanent magnet 532 by the magnetic detection element 533, the control device 700 determines that the lower cover 510 does not exist at the mounting position thereof.

The arrangement of the permanent magnet 532 and the magnetic detection element 533 may be reversed. That is, in the present embodiment, the permanent magnet 532 is fixed to the lower cover 510 and the magnetic detection element 533 is fixed to the rotary table 121, but the permanent magnet 532 is fixed to the rotary table 121 and the magnetic detection element 533 is fixed to the lower cover 510. It may be fixed to. Further, the installation position of the lower cover presence detector 531 is not limited to the position shown in FIG. Further, although a non-contact type proximity sensor is used in this embodiment, a contact type limit switch may be used.

As shown in FIG. 4, the safety cover presence detector 530 has an upper cover presence detector 535 that detects the presence of the upper cover 520 at the mounting position where the upper cover 520 is attached. The top cover presence detector 535 is, for example, a magnetic proximity sensor and includes a permanent magnet 536 fixed to the top cover 520 and a magnetic detection element 537 fixed to the safety door frame 199. The magnetic detection element 537 detects the proximity of the permanent magnet 536 by detecting the magnetism of the permanent magnet 536. The magnetic detection element 537 transmits a signal indicating the detection result to the control device 700. When the control device 700 detects the presence of the permanent magnet 536 by the magnetic detection element 537, the control device 700 determines that the upper cover 520 is present at the mounting position thereof. On the other hand, when the control device 700 detects the absence of the permanent magnet 536 by the magnetic detection element 537, the control device 700 determines that the upper cover 520 does not exist at the mounting position.

The arrangement of the permanent magnet 536 and the magnetic detection element 537 may be reversed. That is, in the present embodiment, the permanent magnet 536 is fixed to the upper cover 520 and the magnetic detection element 537 is fixed to the safety door frame 199, but the permanent magnet 536 is fixed to the safety door frame 199 and the magnetic detection element 537 is on the top. It may be fixed to the cover 520. Further, the installation position of the upper cover presence detector 535 is not limited to the position shown in FIG. Further, although a non-contact type proximity sensor is used in this embodiment, a contact type limit switch may be used.

FIG. 8 is a flowchart showing a molding operation when the safety cover according to the embodiment does not exist at the mounting position. Among the molding operations shown in FIG. 8, the operation of the mold clamping device 100 and the operation of the ejector device 200 are performed under the control of the control device 700. Further, among the molding operations shown in FIG. 8, the taking out of the molded product and the installation of the insert material are performed by the operator. The processing after step S101 shown in FIG. 8 is performed when the safety cover 500 does not exist at the mounting position, that is, when the safety cover 500 is removed. Whether or not the safety cover 500 is present at the mounting position can be confirmed by the safety cover presence detector 530. If at least one of the pair of lower covers 510 and the pair of upper covers 520 is not present at the mounting position, the controller 700 determines that the safety cover 500 is not present at the mounting position.

First, the mold clamping device 100 rotates the rotary table 121 by 180 ° (step S101). As a result, one lower mold 820 moves from the mold clamping position P1 to the molded product take-out position P2, and the other lower mold 820 moves from the molded product take-out position P2 to the mold clamping position P1.

During the rotation of the rotary table 121, the control device 700 monitors the presence / absence of intrusion of an object from the opening 105 of the side panel 101 into the molded product take-out area A1 by the molded product take-out area intrusion detector 710. In the molded product take-out area A1, a member that rotates with the rotary table 121 (for example, lower mold 820, piping connector 126, wiring connector 128) and a member that does not rotate with the rotary table 121 (for example, upper mold 810, tie bar 140) are provided. This is because both exist.

If an object intrudes into the molded product take-out area A1 from the opening 105 of the side panel 101 during the rotation of the rotary table 121, the control device 700 interrupts the rotation of the rotary table 121. Therefore, the rotation of the rotary table 121 is stopped halfway. Therefore, it is possible to prevent a part of the worker's body (for example, a hand) from being pinched between the member that rotates with the rotary table 121 and the member that does not rotate with the rotary table 121.

On the other hand, if there is no intrusion of an object from the opening 105 of the side panel 101 into the molded product take-out area A1 during the rotation of the rotary table 121, the control device 700 continues the rotation of the rotary table 121.

After the rotation of the rotary table 121 (step S101), the mold clamping device 100 closes the mold in the mold clamping area A2 (step S102). Further, after the rotation of the rotary table 121 (step S101), the ejector device 200 projects the molded product from the lower mold 820 in the molded product take-out area A1 (step S201).

After projecting the molded product from the lower mold 820 (step S201), the operator takes out the molded product from the lower mold 820 in the molded product take-out area A1 (step S301). As shown in FIG. 8, the removal of the molded product (step S301) is performed after waiting for the end of the mold closing (step S102). Therefore, a waiting time occurs.

If an operator accidentally enters the molded product take-out area A1 through the opening 105 of the side panel 101 while the mold is closed, the safety cover 500 is removed, so that the operator may invade the mold clamping area A2. In the mold clamping area A2, a member that moves while the mold is closed (for example, the upper platen 110 and the upper mold 810) and a member that does not move during the mold closing (for example, the lower platen 120, the rotary table 121, and the lower mold 820) Both are present and these members approach during mold closure.

Therefore, when the intrusion of an object is detected by the molded product take-out area intrusion detector 710 during the mold closing, the control device 700 interrupts the mold closing. This makes it possible to prevent a part of the worker's body (for example, a hand) from being pinched between the member that moves while the mold is closed and the member that does not move while the mold is closed.

On the other hand, if the intrusion of the object is not detected by the molded product take-out area intrusion detector 710 during the mold closing, the control device 700 continues the mold closing.

After the mold closing (step S102), the mold clamping device 100 performs mold clamping (step S103). A cavity space 801 (see FIG. 2) is formed between the upper mold 810 and the lower mold 820 in the mold-clamped state. A molded product is obtained by filling the cavity space 801 with a liquid molding material and cooling and solidifying the filled molding material. After that, the mold clamping device 100 performs mold opening (step S104). The mold opening is continued regardless of whether or not an object has invaded the molded product take-out area A1 from the opening 105 of the side panel 101. As the mold opening progresses, the distance between the member that moves during the mold opening and the member that does not move during the mold opening increases, so that a part of the worker's body (for example, a hand) may be caught between these members. Because it does not occur.

Further, after closing the mold (step S102), the operator takes out the molded product from the lower mold 820 in the molded product take-out area A1 (step S301). After that, the ejector device 200 performs a return operation of lowering the ejector rod 230 (step S202).

While the ejector rod 230 is descending, the control device 700 monitors the presence or absence of intrusion of an object from the opening 105 of the side panel 101 into the molded product removal area A1 by the molded product removal area intrusion detector 710. This is because the molded product take-out area A1 contains both a member (for example, a movable member 830) that descends together with the ejector rod 230 and a lower mold 820.

If an object intrudes into the molded product take-out area A1 from the opening 105 of the side panel 101 during the descent of the ejector rod 230, the control device 700 interrupts the descent of the ejector rod 230. Therefore, the descent of the ejector rod 230 is stopped halfway. Therefore, for example, it is possible to prevent a part of the worker's body (for example, a hand) from being drawn between the movable member 830 and the lower mold 820.

On the other hand, if there is no intrusion of an object from the opening 105 of the side panel 101 into the molded product take-out area A1 during the descent of the ejector rod 230, the control device 700 continues the descent of the ejector rod 230.

In addition, unlike the lowering of the ejector rod 230 (step S202), the ascending of the ejector rod 230 (step S201) is performed regardless of whether or not an object has invaded the molded product take-out area A1 from the opening 105 of the side panel 101. Will continue. This is because there is no situation in which a part of the worker's body (for example, a hand) is pulled between the movable member 830 and the lower mold 820 while the ejector rod 230 is ascending.

After the return operation of the ejector device 200 (step S202), the operator installs the insert material in the lower mold 820 in the molded product take-out area A1 (step S302). In this way, this process is completed. After this process, the processes after step S101 are performed again. The process shown in FIG. 8 may be repeated a preset number of times.

As described above, when the safety cover 500 is removed, the molded product is taken out (step S301) after waiting for the end of mold closing (step S102) as shown in FIG. Due to the waiting time, not only the take-out of the molded product (step S301) but also the return operation of the ejector device 200 (step S202) and the installation of the insert material (step S302) are delayed.

On the other hand, when the safety cover 500 is attached, the molded product is taken out (step S301) without waiting for the end of the mold closing (step S102) as described later. FIG. 9 is a flowchart showing a molding operation when the safety cover according to the embodiment is present at the mounting position. Whether or not the safety cover 500 is present at the mounting position can be confirmed by the safety cover presence detector 530. Only when a pair of lower covers 510 and a pair of upper covers 520 are present at their respective mounting positions, the controller 700 determines that the safety cover 500 is present at that mounting position. Hereinafter, the differences between the operation flow shown in FIG. 8 and the operation flow shown in FIG. 9 will be mainly described.

When the safety cover 500 is present at the mounting position, that is, when the safety cover 500 is mounted, the operator cannot enter the mold clamping area A2 while the mold is closed. Therefore, an operator is placed between a member that moves while the mold is closed (for example, the upper platen 110 or the upper mold 810) and a member that does not move while the mold is closed (for example, the lower platen 120, the rotary table 121, or the lower mold 820). The safety cover 500 can prevent a part of the body (for example, a hand) from being pinched. In addition, unlike the mold clamping area A2, the molded product take-out area A1 does not have a member that moves while the mold is closed.

Therefore, when the molded product take-out area intrusion detector 710 detects the intrusion of an object during the mold closing, the control device 700 continues the mold closing. Thereby, the mold closing (step S102) and the taking out of the molded product (step S301) can be performed in parallel. As a result, the timing of the return operation of the ejector device 200 (step S202) and the installation of the insert material (step S302) can be accelerated, and the molding cycle time can be shortened. This is possible by attaching the safety cover 500.

The control device 700 prohibits the continuation of mold closing when the molded product take-out area intrusion detector 710 detects the intrusion of an object during mold closing until the safety cover presence detector 530 detects the presence of the safety cover 500. .. A member that moves while the mold is closed (for example, the upper platen 110 or the upper mold 810) and a member that does not move while the mold is closed (for example, the lower platen 120 or the rotary table 121) when the operator forgets to attach the safety cover 500. It is possible to prevent a part of the worker's body (for example, a hand) from being caught between the lower mold 820) and the lower mold 820).

If the safety cover 500 is irremovably attached to the upper platen 110 by welding or the like, the safety cover presence detector 530 may be omitted.

(Modification example of safety cover)
FIG. 10 is a perspective view showing a state when the mold closing of the safety cover is completed according to the modified example. FIG. 11 is a perspective view of the safety cover shown in FIG. 10 as viewed from an angle different from that of FIG. FIG. 12 is a diagram showing the first fixing guide shown in FIG. 11 in a broken state. FIG. 13 is a diagram showing the second fixing guide shown in FIG. 11 in a broken state. FIG. 14 is a plan view showing a mold clamping device on which the safety cover shown in FIG. 10 is mounted. FIG. 15 is a front view showing a part of the mold clamping device shown in FIG. In FIG. 15, the alternate long and short dash line indicates the positions of the first elevating cover 541 and the second elevating cover 542 at the start of mold closing, and the solid line indicates the positions of the first elevating cover 541 and the second elevating cover 542 when the mold closing is completed. show. Hereinafter, the differences between the safety cover 500 of the above embodiment and the safety cover 500A of this modification will be mainly described.

The safety cover 500A of this modification has a first elevating cover 541 that elevates and descends together with the upper platen 110. As shown in FIG. 15, the first elevating cover 541 forms a gap S1 with the upper surface of the rotary table 121. As the upper platen 110 descends from the mold closing start position to the mold closing completion position, the first elevating cover 541 descends from the position shown by the alternate long and short dash line in FIG. 15 to the position shown by the solid line in FIG. Along with this, the gap S1 gradually narrows. The size of the gap S1 when the mold closing is completed is set so that an object cannot enter the gap S1 when the mold closing is completed. Since the first elevating cover 541 moves up and down together with the upper platen 110, when the mold closing completion position of the upper platen 110 is changed due to the mold thickness adjustment, the first elevating cover 541 is replaced or the position is adjusted. A pair of first elevating covers 541 are provided, for example, and include a first fixed cover 550 and a first movable cover 560, respectively.

The first fixing cover 550 is fixed to the upper platen 110 and projects downward from the upper platen 110. The first fixing cover 550 is made of, for example, a metal plate and is attached to a vertical surface 111 parallel to the side panel 101 of the upper platen 110 as shown in FIG.

The first movable cover 560 is movably suspended upward with respect to the first fixed cover 550. As shown in FIG. 11, the first fixing cover 550 is provided with a pair of first fixing guides 551. As shown in FIG. 12, guide grooves 552 extending in the vertical direction are formed in each of the pair of first fixed guides 551. The first movable cover 560 is movable along the guide groove 552.

The first movable cover 560 is inserted into, for example, the guide groove 552 of the first fixed guide 551 from above, and is suspended by the stopper groove 553 of the first fixed guide 551. The first movable cover 560 has a side edge portion 561 inserted into the guide groove 552 and a retaining portion 562 protruding from the side edge portion 561. The retaining portion 562 is inserted into the stopper groove 553 and placed on the lower surface of the stopper groove 553.

As shown in FIG. 15, the first movable cover 560 projects downward from the first fixed cover 550 and forms a gap S1 with the upper surface of the rotary table 121. Since the first movable cover 560 moves up and down together with the upper platen 110, the gap S1 gradually narrows while the mold is closed. When an object has entered the gap S1, the first movable cover 560 is pushed back by the object and therefore rises with respect to the first fixed cover 550. Therefore, it is possible to prevent the gap S1 from becoming narrower, and it is possible to reduce the pressure acting on the object that has entered the gap S1.

The first movable cover 560 is made of, for example, a transparent resin plate, and closes the openings 555 and 557 of the first fixed cover 550 as shown in FIG. It is prohibited for the worker to enter the mold clamping area A2 from the metal plate opening 555, 557 while the mold is closed, and the worker is prohibited from entering the mold clamping area A2 from the metal plate opening 555, 557 while the mold is closed. You can see the situation. Further, since the metal plate is used, the strength of the first elevating cover 541 can be ensured.

As shown in FIG. 11, the first movable cover 560 has a first notch 563 in order to prevent interference with the upper platen 110. Further, the first movable cover 560 has a second notch 564 in order to prevent interference with the piping connector 126 or the wiring connector 128. The first notch 563 and the second notch 564 are formed at two opposite corners of the rectangular transparent resin plate.

The second notch 564 of the first movable cover 560 protrudes downward from the notch 554 of the first fixed cover 550 as shown in FIG. 15, and is connected to the piping connector 126 or the wiring connector 128 when the mold is closed in the X direction. A slight gap is formed between them. It should be noted that this gap does not have to be formed. It is sufficient that the piping connector 126, the wiring connector 128, and the lower mold 820 can pass under the first movable cover 560 when the rotary table 121 is rotated after the mold is opened. Since the upper platen 110 rises when the mold is opened, the first movable cover 560 also rises, and the gap is widened.

As shown in FIG. 10, the first elevating cover 541 detects the rise of the first movable cover 560 with respect to the first fixed cover 550 due to the intrusion of an object into the gap between the first movable cover 560 and the rotary table 121. 1 Movable cover rise detector 590 is attached. The first movable cover rise detector 590 is, for example, a magnetic proximity sensor and includes a permanent magnet 591 fixed to the first fixed cover 550 and a magnetic detection element 592 fixed to the first movable cover 560. The magnetic detection element 592 detects the proximity of the permanent magnet 591 by detecting the magnetism of the permanent magnet 591. The permanent magnet 591 and the magnetic detection element 592 are arranged so as to cross the lower edge 556 of the opening 555 of the first fixed cover 550, for example.

When the first movable cover 560 is suspended from the first fixed cover 550, the magnetic detection element 592 detects the magnetism of the permanent magnet 591 because the distance between the permanent magnet 591 and the magnetic detection element 592 is short. On the other hand, when an object is caught in the gap S1 and the first movable cover 560 rises with respect to the first fixed cover 550, the distance between the permanent magnet 591 and the magnetic detection element 592 becomes long, so that the magnetic detection element 592 is the permanent magnet 591. It stops detecting magnetism.

The arrangement of the permanent magnet 591 and the magnetic detection element 592 may be reversed. That is, in the present embodiment, the permanent magnet 591 is fixed to the first fixed cover 550 and the magnetic detection element 592 is fixed to the first movable cover 560, but the permanent magnet 591 is fixed to the first movable cover 560 and magnetic detection is performed. The element 592 may be fixed to the first fixing cover 550. Further, the installation position of the first movable cover rise detector 590 is not limited to the position shown in FIG.

The magnetic detection element 592 transmits a signal indicating the detection result to the control device 700. When the control device 700 detects the presence of the permanent magnet 591 by the magnetic detection element 592, the first movable cover 560 is suspended from the first fixed cover 550, and the first movable cover is suspended from the first fixed cover 550. It is determined that 560 has not risen. On the other hand, when the control device 700 detects the absence of the permanent magnet 591 by the magnetic detection element 592, it determines that the object is caught in the gap S1 and the first movable cover 560 is raised with respect to the first fixed cover 550.

The first movable cover rise detector 590 may also serve as a first lift cover presence detector that detects the presence of the first lift cover 541 at the mounting position where the first lift cover 541 is attached. When the presence of the permanent magnet 591 is detected by the magnetic detection element 592, it can be determined that the first elevating cover 541 is present at the mounting position. On the other hand, when the absence of the permanent magnet 591 is detected by the magnetic detection element 592, it can be determined that the first elevating cover 541 does not exist at the mounting position.

In the present embodiment, the first movable cover rise detector 590 also serves as the first elevating cover presence detector, but the first elevating cover presence detector may be provided separately from the first movable cover rise detector 590. .. Further, although a non-contact type proximity sensor is used in this embodiment, a contact type limit switch may be used.

Further, the safety cover 500A of this modification has a second elevating cover 542 that elevates and descends together with the upper platen 110. As shown in FIG. 15, the second elevating cover 542 forms a gap S2 with the upper surface of the rotary table 121. As the upper platen 110 descends from the mold closing start position to the mold closing completion position, the second elevating cover 542 descends from the position shown by the alternate long and short dash line in FIG. 15 to the position shown by the solid line in FIG. Along with this, the gap S2 gradually narrows. The size of the gap S2 when the mold is closed is set so that an object cannot enter the gap S2 when the mold is closed. Since the second elevating cover 542 moves up and down together with the upper platen 110, when the mold closing completion position of the upper platen 110 is changed due to the mold thickness adjustment, the second elevating cover 542 is replaced or the position is adjusted. The second elevating cover 542 is provided, for example, in a pair, and includes a second fixed cover 570 and a second movable cover 580, respectively.

The second fixed cover 570 is fixed to the upper platen 110 and projects downward from the upper platen 110. The second fixing cover 570 is made of, for example, a metal plate and is attached to a vertical surface 112 inclined with respect to the side panel 101 of the upper platen 110 as shown in FIG.

The second movable cover 580 is movably suspended upward with respect to the second fixed cover 570. As shown in FIG. 11, the second fixing cover 570 is provided with a pair of second fixing guides 571. As shown in FIG. 13, guide grooves 572 extending in the vertical direction are formed in each of the pair of second fixed guides 571. The second movable cover 580 is movable along the guide groove 572.

The second movable cover 580 is inserted into, for example, the guide groove 572 of the second fixed guide 571 from above, and is suspended by the stopper groove 573 of the second fixed guide 571. The second movable cover 580 has a side edge portion 581 inserted into the guide groove 572 and a retaining portion 582 protruding from the side edge portion 581. The retaining portion 582 is inserted into the stopper groove 573 and placed on the lower surface of the stopper groove 573.

As shown in FIG. 15, the second movable cover 580 projects downward from the second fixed cover 570 and forms a gap S2 with the upper surface of the rotary table 121. Since the second movable cover 580 moves up and down together with the upper platen 110, the gap S2 gradually narrows while the mold is closed. When an object has entered the gap S2, the second movable cover 580 is pushed back by the object and therefore rises with respect to the second fixed cover 570. Therefore, it is possible to prevent the gap S2 from becoming narrower, and it is possible to reduce the pressure applied to the object that has entered the gap S2.

The second movable cover 580 is made of, for example, a transparent resin plate, and closes the opening 575 of the second fixed cover 570 as shown in FIG. While the worker is prohibited from entering the mold clamping area A2 through the opening 575 of the metal plate while the mold is closed, the worker visually recognizes the state of the mold clamping area A2 from the opening 575 of the metal plate while the mold is closed. be able to. Further, since the metal plate is used, the strength of the second elevating cover 542 can be ensured.

The second movable cover 580 has a notch 583 to prevent interference with the fixed core 124 as shown in FIG.

As shown in FIG. 10, the second elevating cover 542 detects the rise of the second movable cover 580 with respect to the second fixed cover 570 due to the intrusion of an object into the gap between the second movable cover 580 and the rotary table 121. 2 Movable cover rise detector 595 is attached. The second movable cover rise detector 595 is, for example, a magnetic proximity sensor and includes a permanent magnet 596 fixed to the second fixed cover 570 and a magnetic detection element 597 fixed to the second movable cover 580. The magnetic detection element 597 detects the proximity of the permanent magnet 596 by detecting the magnetism of the permanent magnet 596. The permanent magnet 596 and the magnetic detection element 597 are arranged so as to cross the lower edge 576 of the opening 575 of the second fixed cover 570, for example.

When the second movable cover 580 is suspended from the second fixed cover 570, the magnetic detection element 597 detects the magnetism of the permanent magnet 596 because the distance between the permanent magnet 596 and the magnetic detection element 597 is short. On the other hand, when an object is caught in the gap S2 and the second movable cover 580 rises with respect to the second fixed cover 570, the distance between the permanent magnet 596 and the magnetic detection element 597 becomes long, so that the magnetic detection element 597 is the permanent magnet 596. It stops detecting magnetism.

The arrangement of the permanent magnet 596 and the magnetic detection element 597 may be reversed. That is, in the present embodiment, the permanent magnet 596 is fixed to the second fixed cover 570 and the magnetic detection element 597 is fixed to the second movable cover 580, but the permanent magnet 596 is fixed to the second movable cover 580 and magnetic detection is performed. The element 597 may be fixed to the second fixed cover 570. Further, the installation position of the second movable cover rise detector 595 is not limited to the position shown in FIG.

The magnetic detection element 597 transmits a signal indicating the detection result to the control device 700. When the control device 700 detects the presence of the permanent magnet 596 by the magnetic detection element 597, the second movable cover 580 is suspended from the second fixed cover 570, and the second movable cover is suspended from the second fixed cover 570. It is determined that 580 has not risen. On the other hand, when the control device 700 detects the absence of the permanent magnet 596 by the magnetic detection element 597, it determines that the object is caught in the gap S2 and the second movable cover 580 is raised with respect to the second fixed cover 570.

The second movable cover rise detector 595 may also serve as a second lift cover presence detector that detects the presence of the second lift cover 542 at the mounting position where the second lift cover 542 is attached. When the presence of the permanent magnet 596 is detected by the magnetic detection element 597, it can be determined that the second elevating cover 542 is present at the mounting position. On the other hand, when the absence of the permanent magnet 596 is detected by the magnetic detection element 597, it can be determined that the second elevating cover 542 does not exist at the mounting position.

In the present embodiment, the second movable cover ascending detector 595 also serves as the second elevating cover presence detector, but the second elevating cover presence detector may be provided separately from the second movable cover ascending detector 595. .. Further, although a non-contact type proximity sensor is used in this embodiment, a contact type limit switch may be used.

FIG. 16 is a flowchart showing the processing of the control device during mold closing when the safety cover shown in FIG. 10 is present at the mounting position. Whether or not the safety cover 500A is present at the mounting position can be confirmed by the first elevating cover presence detector and the second elevating cover presence detector. The first elevating cover presence detector and the second elevating cover presence detector constitute a safety cover presence detector. Only when the pair of first elevating covers 541 and the pair of second elevating covers 542 are present at the respective mounting positions, the control device 700 determines that the safety cover 500A is present at the mounting position. The process shown in FIG. 16 is started at the start of mold closing and is repeated during mold closing.

The control device 700 uses the detection result of the molded product take-out area intrusion detector 710 to determine whether or not an object has invaded the molded product take-out area A1 from the opening 105 of the side panel 101 while the mold is closed. Step S401). Here, the object is a part of the worker's body (for example, a hand).

When the object does not enter the molded product take-out area A1 from the opening 105 of the side panel 101 (steps S401 and No), the object enters the mold clamping area A2 from the molded product take-out area A1 through the gaps S1 and S2. There is no such thing. Therefore, the control device 700 continues to close the mold (step S402), and ends the current process. As described above, the process shown in FIG. 16 is repeated while the mold is closed.

On the other hand, when an object enters the molded product take-out area A1 from the opening 105 of the side panel 101 (steps S401, Yes), the object enters the mold clamping area A2 from the molded product take-out area A1 through the gaps S1 and S2. there is a possibility. Therefore, in this case, the control device 700 determines whether or not the first movable cover 560 is raised with respect to the first fixed cover 550 by using the detection result of the first movable cover rise detector 590, and the second movable cover is second movable. Using the detection result of the cover rise detector 595, it is determined whether or not the second movable cover 580 is raised with respect to the second fixed cover 570 (step S403).

If neither the rise of the first movable cover 560 with respect to the first fixed cover 550 nor the rise of the second movable cover 580 with respect to the second fixed cover 570 is detected (steps S403, No), the object is in the mold clamping area A2. Even if the object has not invaded or the object has invaded the mold clamping area A2, the mold closing has not progressed to the extent that the object is pinched. Therefore, the control device 700 continues to close the mold (step S402), and ends the current process. As described above, the process shown in FIG. 16 is repeated while the mold is closed.

On the other hand, when at least one of the rise of the first movable cover 560 with respect to the first fixed cover 550 and the rise of the second movable cover 580 with respect to the second fixed cover 570 is detected (step S403, Yes), the object is in the mold clamping area. It is invading A2. Therefore, the control device 700 interrupts the mold closing (step S404) and ends the current process.

As described above, the control device 700 detects at least one of the rise of the first movable cover 560 with respect to the first fixed cover 550 and the rise of the second movable cover 580 with respect to the second fixed cover 570 while the mold is closed. Before doing so, continue mold closing. While the mold is closed, the operator can enter the molded product take-out area A1 and take out the molded product from the lower mold 820 in the molded product take-out area A1. Therefore, as shown in FIG. 9, the mold closing (step S102) and the taking out of the molded product (step S301) can be performed in parallel. As a result, the timing of the return operation of the ejector device 200 (step S202) and the installation of the insert material (step S302) can be accelerated, and the molding cycle time can be shortened. This is possible by attaching the safety cover 500A.

Further, when the control device 700 detects at least one of the rise of the first movable cover 560 with respect to the first fixed cover 550 and the rise of the second movable cover 580 with respect to the second fixed cover 570 during the mold closing, the mold is closed. To interrupt. As a result, the lowering of the upper platen 110 is stopped, so that the member that moves while the mold is closed (for example, the upper platen 110 or the upper mold 810) and the member that does not move during the mold closing (for example, the lower platen 120 or the rotary table 121). , It is possible to prevent a part of the worker's body (for example, a hand) from being caught between the lower mold 820).

The processing of the control device 700 during mold closing when the safety cover 500A is not present at the mounting position is the processing of the control device 700 during mold closing when the safety cover 500 of the above embodiment is not present at the mounting position. Since it is the same as the above, the description thereof will be omitted. If at least one of the pair of first elevating covers 541 and the pair of second elevating covers 542 is not present at the mounting position, the controller 700 determines that the safety cover 500A is not present at the mounting position.

If the safety cover 500A is irremovably attached to the upper platen 110 by welding or the like, the safety cover presence detector may be omitted.

Although the embodiments of the injection molding machine have been described above, the present invention is not limited to the above embodiments and the like, and various modifications and variations are made within the scope of the gist of the present invention described in the claims. Improvement is possible.

10 Injection molding machine 100 Mold clamping device 101 Side panel 105 Opening 110 Upper platen 120 Lower platen 121 Rotating table 122 Rotating center 123 Rotating mechanism 190 Elevating mechanism 500 Safety cover 510 Lower cover 520 Upper cover 541 First elevating cover 542 Second elevating Cover 550 1st fixed cover 560 1st movable cover 570 2nd fixed cover 580 2nd movable cover 590 1st movable cover ascending detector 595 2nd movable cover ascending detector 700 Control device 710 Molded product take-out area intrusion detector 800 gold Molding device 810 Upper mold 820 Lower mold A1 Molded product take-out area A2 Molding area

Claims (5)

An injection molding machine having a mold clamping device for mold-clamping an upper mold and a lower mold.
The mold clamping device is
The upper platen to which the upper mold is attached and
A rotary table to which the plurality of lower molds can be attached, and
A lower platen that rotatably supports the rotary table from below,
A rotation mechanism that rotates the rotary table and
It has an elevating mechanism for elevating and lowering the upper platen.
The mold clamping device is
A mold clamping area in which the upper mold and one lower mold are clamped by raising and lowering the upper platen.
A molded product take-out area in which the molded product molded in the mold clamping area is taken out is formed.
A safety cover is provided between the mold clamping area and the molded product take-out area to limit the intrusion from the molded product take-out area into the mold clamping area .
The safety cover is an injection molding machine having a lower cover attached to the upper surface of the rotary table and rotating together with the rotary table, and an upper cover provided above the lower cover and fixed to the lower platen . An injection molding machine having a mold clamping device for mold-clamping an upper mold and a lower mold.
The mold clamping device is
The upper platen to which the upper mold is attached and
A rotary table to which the plurality of lower molds can be attached, and
A lower platen that rotatably supports the rotary table from below,
A rotation mechanism that rotates the rotary table and
It has an elevating mechanism for elevating and lowering the upper platen.
The mold clamping device is
A mold clamping area in which the upper mold and one lower mold are clamped by raising and lowering the upper platen.
A molded product take-out area in which the molded product molded in the mold clamping area is taken out is formed.
A safety cover is provided between the mold clamping area and the molded product take-out area to limit the intrusion from the molded product take-out area into the mold clamping area.
The safety cover is an injection molding machine having an elevating cover that moves up and down together with the upper platen. The injection molding according to claim 2 , wherein the elevating cover has a fixed cover that is fixed to the upper platen and protrudes downward from the upper platen, and a movable cover that is movably suspended upward from the fixed cover. Machine. A movable cover rise detector that detects the rise of the movable cover with respect to the fixed cover due to the intrusion of an object into the gap between the movable cover and the rotary table.
It is equipped with a control device that controls the elevating mechanism.
The injection molding machine according to claim 3 , wherein the control device interrupts mold closing when the movable cover rise detector detects the rise of the movable cover with respect to the fixed cover. An injection molding machine having a mold clamping device for mold-clamping an upper mold and a lower mold.
The mold clamping device is
The upper platen to which the upper mold is attached and
A rotary table to which the plurality of lower molds can be attached, and
A lower platen that rotatably supports the rotary table from below,
A rotation mechanism that rotates the rotary table and
It has an elevating mechanism for elevating and lowering the upper platen.
The mold clamping device is
A mold clamping area in which the upper mold and one lower mold are clamped by raising and lowering the upper platen.
A molded product take-out area in which the molded product molded in the mold clamping area is taken out is formed.
A safety cover is provided between the mold clamping area and the molded product take-out area to limit the intrusion from the molded product take-out area into the mold clamping area.
An injection molding machine having a safety cover presence detector that detects the presence of the safety cover at a mounting position where the safety cover is attached.

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