JP6900411B2 - Mold changer of molding machine and control method of mold changer of molding machine - Google Patents

Description

The present invention relates to a mold changing device for a molding machine and a method for controlling a mold changing device for a molding machine.

As a mold changing device for a molding machine such as an injection molding machine, the one described in Patent Document 1 is known. Patent Document 1 describes that the mold-mounted vehicle is advanced from the mold moving carriage to the mold mounting position by operating one mounted vehicle drive cylinder. However, in Patent Document 1, the vehicle equipped with the mold can be moved only by the stroke of the drive cylinder. Further, a drive cylinder having a long stroke is required, and as a result, there are problems that the arrangement space is restricted and the stopping accuracy is lowered.

As a solution to the above problem, as in Patent Document 2, a device capable of reciprocating a vehicle equipped with a mold by the total stroke amount of the first hydraulic cylinder mechanism and the second hydraulic cylinder mechanism is also known. is there. As a result, in Patent Document 2, the stroke amount of each hydraulic cylinder mechanism can be set small, and both cylinders are positioned so as to overlap each other in the moving direction of the mold-mounted vehicle under the piston contraction state. The arrangement space can be made sufficiently smaller than when a single hydraulic cylinder mechanism is used.

Further, as in Patent Document 2, a portion corresponding to a vehicle equipped with a mold is moved forward and backward in two stages, and as a vehicle using an electric motor as a driving means, the one described in Patent Document 3 is known. is there. Patent Document 3 describes that a mechanism using a winding transmission by a pinion, a rack, and a chain is adopted as a mold transfer device by driving an electric motor. Then, in Patent Document 3, a rack is fixed to the transport guide, and the transport guide is advanced by rotating the pinion by driving a motor that meshes with the rack. Further, another sprocket is rotated by the drive of the motor, and the chain wound around the sprocket moves. Then, the carrier and die plate fixed to the chain move forward. As a result, the die plate is advanced in two stages as shown in FIGS. 4 to 6. Further, in Patent Document 2, it is described in the left column of page 2 that a chain may be attached to the lower part of the transport guide instead of the rack and a sprocket may be used instead of the pinion.

Jikken No. 3-8407 (Claim 1, page 5, right column, Fig. 2) JP-A-5-104535 (Claim 1, 0031, 0037, FIG. 1) Japanese Patent Publication No. 59-42171 (Claim 1, right column on page 1, left column on page 2, FIG. 1, FIG. 4, FIG. 5, FIG. 6)

However, there is still a problem that oil leaks from the hydraulic cylinder even in the mold changing device in which the portion corresponding to the vehicle equipped with the mold is moved forward and backward by the hydraulic cylinder as in Patent Document 2. Further, there is a problem that the stop position accuracy of the mold changing device is deteriorated, and there is a problem that the speed control cannot be switched with high accuracy in the section until the stop even if the stopper is used at the time of the stop.

Further, even in a mold changing device for moving a part corresponding to a vehicle equipped with a mold in two stages forward and backward using an electric motor as in Patent Document 3, the cost is high when a rack and a pinion are used for the drive mechanism. There was a problem of becoming. Further, even when a chain is used, in Patent Document 3, the carrier and the die plate are moved by moving the endless chain by driving a motor, so that the amount of extension of the chain during aged use becomes large and the chain is moved. There was a problem that the accuracy was lowered.

Further, in Patent Document 3, since the carrier and the die plate are placed on the transport guide and a complicated drive mechanism is provided, the width of the advancing / retreating mechanism portion in the height direction is increased. There was a problem. Therefore, it becomes difficult to place the mold changing device on the mold transfer cart, and in the case of a vertical molding machine, the mold cannot be carried in unless the mold opening interval between the fixed plate and the movable plate is widened. There was a problem. Further, Patent Document 2 does not describe the control when moving or stopping by the electric motor, and it is not possible to know what kind of method is adopted.

Therefore, in view of the above problems, the first object of the present invention is to provide a mold changing device having good accuracy at the time of moving or stopping while suppressing the cost. A second object of the present invention is to provide a mold changing device capable of reducing the width of the advancing / retreating mechanism portion of the mold changing device in the height direction.

The mold changing device for a molding machine according to claim 1 of the present invention is a mold changing device for a molding machine that carries in or out a mold in a horizontal direction with respect to the molding machine. It is an electric motor, and a first advancing / retreating member that advances / retreats with respect to a base member via a first chain or belt by driving the electric motor, and an advancing / retreating member of the first advancing / retreating member that is partially attached to the base member. Along with this, a part of the first advancing / retreating member is displaced forward with respect to the first advancing / retreating member, and the first advancing / retreating member is advanced / retreated in the same direction as the advancing / retreating direction of the first advancing / retreating member via the second chain or belt. It is characterized by being provided with a second advancing / retreating member capable of advancing forward from the advancing / retreating position of the advancing / retreating member.

The mold changing device for a molding machine according to claim 2 of the present invention is a mold changing device for a molding machine that carries in or out a mold in a horizontal direction with respect to the molding machine, and is a motor attached to a base member. With respect to the drive sprocket or drive pulley fixed to the drive shaft of the electric motor, the first chain or belt meshed with the drive sprocket or drive pulley, and the base member attached to the first chain or belt. A first advancing / retreating member, a driven sprocket or a driven pulley that is rotatably attached to the first advancing / retreating member, and a part of the driven sprocket or the driven pulley that is wound around the driven sprocket or the driven pulley and is partially attached to the base member. A part is attached to a second chain or belt that is displaced as the first advancing / retreating member advances / retreats, and a mounting member that is provided on the second chain or belt and is displaced forward, and at least the first advancing / retreating member. It is forward and backward relative to the member, and a second reciprocating member advanceable in front or than the advanced position of the first reciprocating member, characterized by comprising a.

The mold changing device for a molding machine according to claim 3 of the present invention has, in claim 1 or 2, a chain or belt for advancing / retreating the first advancing / retreating member and a chain or belt for advancing / retreating the second advancing / retreating member. Is characterized in that either portion of both is provided at the same height in the horizontal direction.

The method for controlling a mold changing device for a molding machine according to claim 4 of the present invention is a method for controlling a mold changing device for a molding machine that carries in or out a mold in a horizontal direction with respect to the molding machine. The motor of the driving means of the switching device is a servomotor, and the first advancing / retreating member that advances / retreats with respect to the base member via the first chain or belt by driving the servomotor, and a part of the base member. part with respect to attached the first first reciprocating member advance and retreat motions of the reciprocating member via a second chain or belt to be displaced toward the front and back and forth direction of the first reciprocating members A second advancing / retreating member that can advance / retreat in the same direction and can advance forward from the advancing position of the first advancing / retreating member is provided, and the speed is controlled by the servomotor when the second advancing / retreating member advances / retreats. At the same time, when the second advancing / retreating member is stopped, it comes into contact with the stopper and is stopped.

The mold changing device of the molding machine of the present invention is a mold changing device of a molding machine that carries in or out a mold in a horizontal direction with respect to the molding machine. A first advancing / retreating member that is moved back and forth with respect to the base member via a first chain or belt, and a first advancing / retreating member that is partially attached to the base member and is advancing / retreating of the first advancing / retreating member . A part of the advancing / retreating member is moved forward through the second chain or belt in the same direction as the advancing / retreating direction of the first advancing / retreating member, and from the advancing position of the first advancing / retreating member. Since a second advancing / retreating member capable of advancing to the front is provided, the cost can be suppressed and the accuracy at the time of moving or stopping can be improved.

It is a top view of this embodiment, and is the figure which shows the state which the advancing / retreating member of a mold changing apparatus retracted. It is a top view of the main part of this embodiment. It is a front view of the main part of this embodiment. It is a side view of this embodiment, and is the figure which shows the state which the advancing / retreating member of a mold changing apparatus retracted. It is an arrow view of the main part of the CC line in FIG. It is an arrow view of the main part of the DD line in FIG. It is a side view of this embodiment, and is the figure which shows the state which the advancing / retreating member of a mold changing apparatus has advanced.

The mold transfer device and the mold exchange device of the injection molding machine (molding machine) of the present embodiment will be described with reference to FIGS. 1 to 6. The injection molding machine is a vertical injection molding machine 11 (hereinafter, simply referred to as an injection molding machine 11) similar to Patent Document 1. In the injection molding machine 11, each tie bar 13 is fixed in the vertical direction with respect to the lower plate 12 which is a fixed plate, and the upper portion of each tie bar 13 is fixed to the upper plate 14 which is a pressure receiving plate. Further, the movable platen 15 is provided so as to be raised and lowered by the mold opening / closing mechanism 16 guided by the tie bar 13. Further, the mold can be clamped by the mold clamping mechanism 17 such as the mold clamping cylinder. The injection molding machine 11 of the present embodiment is a multicolor injection molding machine, and a rotary table 19 is rotatably provided on the lower surface of the movable platen 15 with respect to the movable platen 15. Two movable molds 18 can be attached to the lower surface of the rotary table 19 by a clamper (not shown).

Similarly, the upper surface of the lower plate 12 can be attached by two fixing molds 20 and clampers (not shown). The number of molds attached to the injection molding machine 11 may be 1, 3, 4, or the like. The movable mold 18 and the fixed mold 20 are exchanged as a set of an integral mold 21. In the lower plate 12, a guide groove 24 for moving the mold 21 forward and backward, which is a second advancing / retreating member of the mold changing device 22 described later, is provided in the moving direction of the mold mounting vehicle 23. A plurality (here, two) are formed in a certain AA direction (vertical direction in FIG. 1). Furthermore, the periphery of the injection molding machine 11 is guarded by a safety cover (not shown) and a safety door that can be opened and closed.

A mold transfer device 25 is provided on the side of the injection molding machine 11. The mold transfer device 25 includes a base 26 arranged on the side of the injection molding machine 11. The base 26 is composed of a support column 27 provided perpendicular to the floor, each beam member 28 connecting the columns, and a rail 35 fixed to the upper surface of the beam member. The base 26 has a height slightly lower than that of the lower plate 12 of the injection molding machine 11. Then, on the rail 35 of the base 26, the mold moving carriage 29 moves in one side and the other side (BB direction) (left-right direction in FIG. 1) orthogonal to the loading / unloading direction of the mold 21. It is provided as possible. Although the driving means of the mold moving carriage 29 is not shown, it is desirable that an electric motor such as a servomotor is used, and the driving means is provided on either the base 26 or the mold moving carriage 29. In that case, as the power transmission mechanism, a winding transmission mechanism such as a chain or a belt, a rack and pinion mechanism, a wheel rotation mechanism, or the like is appropriately selected.

A mold exchange support base 30 is provided between the injection molding machine 11 and the base 26 of the mold transfer device 25. The mold exchange support base 30 is provided with a mold exchange device facing surface 32 on the upper surface of the support column 31. On the mold changing device facing surface 32, a first guide that guides the lower surface side of the intermediate member 33, which is the first advancing / retreating mechanism of the mold changing device 22 described later, toward the CC direction in FIG. A plurality of (two in this case) grooves 34a are formed. Further, on the outside of the first guide groove 34a of the mold changing device facing surface 32, a plurality of second guide grooves 34b for guiding the lower surface side of the mold-mounted vehicle 23 when moving are provided on each side (here). Then, two each) are formed. The second guide groove 34b of the mold exchange support base 30 is provided so as to be located on the same straight line as the guide groove 24 of the lower plate 12. In addition to the first guide groove 34a and the second guide groove 34b of the mold exchange support base 30, and the guide groove 24 of the lower plate 12, the mold exchange support is used as a guide means when the mold exchange device 22 is moved. Guide means such as one in which a rolling means such as a cam follower provided on one of the base 30 and the mold changing device 22 abuts on the guide surface of the other member may be provided.

Originally, it is desirable that the injection molding machine 11 and the mold transfer device 25 are close to each other, but in the following cases, they may not be provided close to each other. That is, when the movement locus of the crane in the factory for loading and unloading the mold 21 into the mold transport device 25 does not cover the vicinity of the injection molding machine 11. Or, when the crane of the factory moves near the injection molding machine 11, it interferes with some device or structure and hinders the loading and unloading of the mold 21. When it is necessary to arrange equipment such as a temperature control device, a control panel, a hydraulic device, and a take-out robot in the vicinity of the injection molding machine 11, and the mold transfer device 25 cannot be arranged in the vicinity of the injection molding machine 11. In such a case, since the mold transfer device 25 cannot be provided close to the injection molding machine 11, a mold exchange support base 30 is provided between the injection molding machine 11 and the mold transfer device 25, although it is not essential. It is desirable to provide it.

On the rail 35 on the base 26, a main body portion 36 composed of vertical beam members 41, 42 and horizontal beam members 51, 52 of the mold moving carriage 29 is placed. More specifically, wheels such as a cam follower 37 provided on the lower surface of the main body 36 are mounted on the rail 35. On the other hand, on the upper surface of the main body 36 of the mold moving carriage 29, a first mold changing device 38 and a second mold changing device 39 (collectively referred to as a mold changing device 22) are provided on one side and the other side. (Called) is installed. The first mold changing device 38 then mounts the mold 21 on the injection molding machine 11, and the second mold changing device 39 mounts the mold 21 removed from the injection molding machine 11. However, the structures of both are almost the same. The number of the mold changing devices 22 may be one, four, or the like, and the mold changing device 22 is directly provided on the base member on the floor without providing the mold moving carriage 29. But it may be.

Explaining the second mold changing device 39 on the other side, the second mold changing device 39 includes a base member 40, an intermediate member 33 which is a first advancing / retreating member, and a mold mounting which is a second advancing / retreating member. It is equipped with a car 23 and the like. The base member 40 is fixed to the upper surface of the main body 36. The base member 40 includes a plurality of vertical beam members 41 and 42 provided in the mold loading / unloading direction (AA direction). In the present embodiment, guide grooves 41a are formed on the upper surfaces of the two vertical beam members 41 on the center side of the vertical beam members. The guide groove 41a guides the wheels and the like on the lower surface side of the intermediate member 33. In addition, guide grooves 42a are formed on the upper surfaces of the two vertical beam members 42 on both outer sides of the vertical members. The guide groove 42a guides the wheels 69 and the like on the lower surface side of the mold-mounted vehicle 23. In addition to these guide grooves 41a and 42a, a plurality of rolling means such as cam followers provided in a row on one of the members as guide means when the intermediate member 33 moves are provided on the guide surface provided in the moving direction of the other member. A guide means such as a contacting mechanism may be provided.

Further, a plate 43 for mounting a motor is fixed to the base member 40 by connecting the vertical beam member 41. A bracket 44 for mounting the motor is fixed to the plate 43 for mounting the motor, and an electric motor is mounted on the bracket 44. The electric motor of this embodiment is a servomotor 45, which is controlled and driven by a servo amplifier or other control device (not shown). A speed reducer 46 is attached to the servomotor 45. The rotation shaft 47 of the speed reducer 46 is also provided in a direction orthogonal to the mold loading / unloading direction (AA direction), and the sprocket 48 (drive sprocket) is fixed to the rotating shaft 47. ing.

Further, as shown in FIG. 5 and the like, another bracket 49 fixed to the plate 43 for mounting the motor has two sprockets 50 (in the direction orthogonal to the mold loading / unloading direction (BB direction)). A driven sprocket) is provided so that it can rotate. The positional relationship between the sprocket 48 and the two sprockets 50 when the mold changing device 22 is viewed from the side is such that the teeth on both ends of the sprocket 50 are located above the teeth on both ends of the sprocket 48 in a plan view. Has been done.

Stoppers 53 and 54 are fixed to the cross beam member 51 on the injection molding machine side of the main body 36 and the cross beam member 52 on the far side from the injection molding machine, respectively. The stoppers 53 and 54 are for contacting a part of the mold-mounted vehicle 23 or a stopper (not shown) to stop the forward and backward movement of the mold-mounted vehicle 23, which will be described later. The stoppers 53 and 54 may be stopped by contacting a part of an intermediate member or a stopper (not shown). Further, if necessary, a limit switch or a proximity switch for switching or stopping the moving speed of the mold-mounted vehicle 23 may be attached.

Next, the intermediate member 33, which is the first advancing / retreating member that is advanced / retreated with respect to the base member 40 as shown in FIG. 6 and the like, will be described. The intermediate member 33 is provided with two vertical beam members 55, 55 in the longitudinal direction. Further, the chain mounting member 56 is provided by connecting the injection molding machine side of the vertical beam members 55, 55, and the chain mounting member 57 is provided by connecting the far side of the vertical beam members 55, 55 from the injection molding machine 11. There is. Then, one end of an endless chain 58 (first chain) for advancing / retreating the first advancing / retreating member is attached to the chain attachment member 56. Further, the other end of the chain 58 for advancing and retreating the first advancing / retreating member is attached to the chain attachment member 57. Therefore, the chain 58 is attached to the central portion of the lower surface of the intermediate member 33 in the AA direction. The central portion of the chain 58 is not fixed to the lower surface of the intermediate member 33, and the length of the chain 58 is longer than the distance between the chain mounting member 56 and the chain mounting member 57. Then, the chain 58 is wound around the sprockets 50 and 50, the direction is changed downward, and the chain 58 is wound on the lower side of the sprocket 48.

The first chain may be fixed in a state where the endless chain is extended over the entire lower surface of the intermediate member 33. In that case, the sprockets 50 and 50 are unnecessary, and the driving sprockets 48 are meshed with the extended chain from the lower surface side to form a shape similar to the rack and pinion mechanism. However, since the number of teeth of the sprocket 48 meshed with the meshing portion of the chain 58 is smaller than that of the present embodiment, it is not suitable for moving the heavy mold 21. However, even in that case, the mechanism using the chain can reduce the rigidity and accuracy of the entire device as compared with the rack and pinion mechanism, and as a result, the cost of the mold changing device can often be reduced.

Further, a sprocket mounting member 59 on the injection molding machine side is provided at a portion of the intermediate member 33 connected to the chain mounting member 56 of the two vertical beam members 55. Further, a sprocket mounting member 60 on the far side from the injection molding machine 11 is provided at a portion of the intermediate member 33 connected to the chain mounting member 57 of the two vertical beam members 55. A sprocket 61 (driven sprocket) is rotatably attached to the sprocket mounting member 59 by a bearing about an axis in a direction orthogonal to the mold loading / unloading direction (AA direction). Further, the sprocket 62 (driven sprocket) is rotatably attached to the sprocket mounting member 60 by a bearing about an axis in a direction orthogonal to the mold loading / unloading direction (AA direction). In the present embodiment, a total of two sets of these sprockets 61 and 62 are provided on the outside of the vertical beam member 55, one set each. The set of sprockets 61 and 62 may be only one set.

A chain 63 (second chain) for advancing and retreating the mold-mounted vehicle 23, which is a second advancing / retreating member, is wound around the sprockets 61 and 62 that are driven and rotated on one side. A similar chain 64 (second chain) is also wound around the sprockets 61 and 62 that are driven and rotated on the other side. One end and the other end of the chains 63 and 64 are fixed to the chain mounting member 65 on the injection molding machine side of the base member 40 at substantially close positions, respectively. More specifically, a chain mounting member 65 having a predetermined width is provided on the injection molding machine side of the upper surface of the vertical beam members 55, 55 of the base member 40. Then, one end and the other end of the chain 63 are fixed at positions near the upper surface of the chain mounting member 65 in the AA direction. Further, one end and the other end of the chain 64 are attached to positions on the opposite side of the central chain 58 from the fixed position of the chain 63 of the chain attachment member 65. The second chain may be an endless one fixed to the base member 40 at at least one place. Further, chain mounting members 72, 72 are provided on the upper surface side of the chains 63, 64 with respect to the sprockets 61, 62, and the chain mounting members 72, 72 are fixed to the lower surface of the main body 66 of the mold-mounted vehicle 23. .. That is, the positions where the chain mounting members 72 and 72 are mounted on the chains 63 and 64 are driven by the chain mounting members 72 and 72 when the mold-mounted vehicle 23 retracts from the injection molding machine 11 as shown in FIGS. The sprocket 62 is in a close position.

The mold changing device 22 is provided with any part of the chain 58 for advancing and retreating the first advancing / retreating member and the chains 63 and 64 for advancing / retreating the second advancing / retreating member at the same height in the horizontal direction. It is desirable to reduce the width of the advancing / retreating mechanism portion in the height direction. Further, making the height of the horizontal portion of the chain 58 and the height of the horizontal portion on the upper surface side of the chains 63 and 64 as high as possible also reduces the width of the advancing / retreating mechanism portion of the mold changing device 22 in the height direction. Desirable for In the present embodiment, the fixed portions at both ends of the chain 58 for advancing and retreating the first advancing / retreating member and the portions wound around the driven brackets 61 and 62 of the chains 63 and 64 for advancing / retreating the second advancing / retreating member are horizontally arranged. It is the same height.

Next, the mold-mounted vehicle 23, which is the second advancing / retreating member, will be described. The mold-mounted vehicle 23 includes a main body 66 and four (plural) mold mounting portions 67 extending horizontally from the main body 66 toward the injection molding machine. The main body 66 is located on the base member 40 on the far side from the injection molding machine 11 when the mold-mounted vehicle 23 is retracted. A horizontal portion on the upper surface side of the chains 63 and 64 is attached to the lower surface of the main body 66. The mold mounting portion 67 of the mold mounting vehicle 23 is provided so as to be located outside the intermediate member 33 in a plan view as shown in FIG. Further, as shown in FIG. 3, the mold mounting portion 67 of the mold mounting vehicle 23 is provided at substantially the same height as the intermediate member 33. The two mold mounting portions 67 on one side mount one of the molding dies 21, and the other mold mounting portion 67 mounts the other of the molding dies 21. .. It should be noted that a mold mounting plate on which at least two or more molds 21 are fixed may be placed on all the mold mounting portions 67. In the present embodiment, the upper surface of the mold mounting portion 67 of the mold mounting vehicle 23 is slightly higher than the upper surface of the intermediate member 33. By arranging the mold-mounted vehicle 23 outside the intermediate member 33, it is not possible to make the height of the upper surface of the mold mounting portion 67 of the mold-mounted vehicle 23 lower than the height of the upper end of the intermediate member 33. Not possible.

Further, a plurality of wheels 69 are provided on the lower surfaces of the main body 66 of the mold-mounted vehicle 23 and the legs 68 of the mold mounting portion 67, respectively, in the AA direction. The wheel 69 is for bearing the own weight of the mold-mounted vehicle 23 and the molding mold 21 on which the mold-mounted vehicle 23 is mounted. The wheels 69 of the mold-mounted vehicle 23 are guided and moved by the guide groove 42a of the base member when reversing.

In another embodiment of the present invention, chains 58, 63, 64 and sprockets 48, 50, 61, 62 are used as the transmission mechanism of the mold changing device 22. However, as the transmission member of the mold changing device 22, a belt such as a timing belt and a pulley (drive pulley and driven pulley) may be used for a part or all of them. Further, a roller or the like may be provided on the upper surface of the mold mounting portion 67 of the mold mounting vehicle 22, so that the mold 21 can move on the mold mounting portion 67.

Further, as another embodiment of the present invention, the mold changing device 22 may mount the mold 21 on the upper surface of the first advancing / retreating member. Specifically, a roller or the like is provided on the upper surface of the first advancing / retreating member of the mold changing device 22. Then, the replacement mold 21 is placed on the roller of the first advancing / retreating member. On the other hand, the second advancing / retreating member has only a function of pushing and pulling back the mold 21. Then, the second advancing / retreating member is connected to the rear portion of the mold 21 or simply abutted (only when pushed) to move the mold 21 on the roller. In that case, it is necessary to provide a plurality of rollers on the upper surface of the mold exchange support base 30 and the upper surface of the lower plate 12 of the injection molding machine 11 in the direction of conveying the mold.

Next, the operation of the mold transfer device 25 and the mold changing device 22 will be described mainly with reference to FIGS. 4 to 7. The first mold changing device 38 of the mold moving carriage 29 on the base 26 is located at the mold mounting position 70 on one side (right side), and the second mold changing device 39 is the injection molding machine 11. It is in the mold exchangeable position 71 facing directly between the two tie bars 13. The mold-mounted vehicle 23 of both the mold changing devices 38 and 39 is in the retracted position, and the mold 21 is not mounted on the mold mounting portion 67. First, the mold 21 to be used next is transferred to the upper surface of the mold mounting portion 67 of the first mold changing device 38 from another transfer device or mold storage using a crane or the like. Then, before mounting the mold 21 on the injection molding machine 11, setup work such as preliminary temperature control of the mold 21 is performed at the mold mounting position 70.

When the molding with the mold currently attached by the injection molding machine 11 is completed, the clamps of the movable mold 18 and the fixed mold 20 are removed, and a set of molds 21 (a plurality of molds are attached to the mold mounting plate). (Including the case where it is) is placed on the lower board 12. Next, the mold 21 is lifted by a mold lift device (not shown) of the lower plate 12, and a gap is created between the lower surface of the mold 21 and the upper surface of the lower plate 12. Alternatively, after locking the connection between the movable mold 18 and the fixed mold 20, only the clamp of the fixed mold 20 is removed first, and then the movable plate 15 and the mold 21 are slightly raised to slightly raise the lower surface and the lower plate of the mold 21. A gap may be created between the upper surfaces of the twelve.

A safety door (not shown) is opened, and then the mold-mounted vehicle 23, which is the second advancing / retreating device of the second mold changing device 39, and the mold mounting portion 67 thereof are advanced toward the injection molding machine 11. Specifically, when the servomotor 45 is driven by a command from a control measure including a servo amplifier, the sprocket 48 (drive sprocket) is rotated via the speed reducer 46. Then, the driving force is transmitted to the chain 58 wound around the sprocket 48, and the intermediate member 33, which is the first advancing / retreating member, is moved toward the left side in FIGS. 4 to 7.

At this time, the speed of the servomotor 45 is controlled, and low-speed movement control, high-speed movement control, and low-speed movement control are performed according to the forward position of the mold-mounted vehicle 23. Then, when it is found by detecting the pulse value of the encoder of the servomotor 45 or the torque value of the servomotor 45 that it has come into contact with the stopper 53 of the forward limit, the driving of the servomotor 45 is stopped. The stop control using such a stopper 53, a limit switch, or the like is tentatively compared with the control performed by detecting the position of the encoder of the servomotor 45, that is, the chain 58 of the first advance / retreat device or the second advance / retreat device Accurate stop control can be performed even if the chains 63 and 64 are stretched due to long-term use.

When the intermediate member 33 is moved, a part of the chains 63 and 64 wound around the sprockets 61 and 62 of the intermediate member 33 is fixed to the chain mounting member 65 on the injection molding machine side of the base member 40. , Chains 63, 64 are moved in the direction of arrow E in FIG. Along with this, the main body 66 and the mold mounting portion 67 of the mold mounting vehicle 23 are attached to the rear side of the chains 63 and 64 via the chain mounting members 72 and 72 at the retracted position of the mold mounting vehicle 23. Is advanced in the same direction as the intermediate member 33, and can be further advanced to the front of the intermediate member 33. Therefore, even if the length of the mold mounting portion 67 of the mold-mounted vehicle 23 is shorter than the forward distance required when replacing the injection mold 21, the forward distance can be advanced. The main body 66 and the mold mounting portion 67 of the mold-mounted vehicle 23 are supported and guided on the guide groove 42a of the base member 40 in the first half of the forward movement, and the guide groove 34b of the mold replacement support base 30 in the middle of the forward movement. Since it is supported and guided by the guide groove 24 on the upper surface of the lower plate 12 of the injection molding machine 11 in the latter half of the forward movement, it may be able to withstand a load below a certain level.

Then, as shown in FIG. 7, the mold mounting portion 67 of the mold-mounted vehicle 23 enters the gap between the lower surface of the mold 21 and the upper surface of the lower plate 12, and when the predetermined position is reached, the stopper 53 and the metal The mold-mounted vehicle 23 comes into contact with the mold-mounted vehicle 23, and the forward movement of the mold-mounted vehicle 23 is stopped. Next, a lift device (not shown) is lowered, and the mold 21 is lowered onto the mold mounting portion 67. Next, the mold changing device 22 is operated again in order to lower the mold 21 from the injection molding machine 11. The operation at the time of retreat is opposite to the operation at the time of retreat, but when the servomotor 45 is rotated in the reverse direction, the sprocket 48 is rotated and the intermediate member 33, which is the first advancing / retreating member, is retracted together with the chain 58. At the same time, since the chains 3 and 64 of the intermediate member 33 are also moved in the direction of the arrow F in FIG. 6, the mold mounting portion 67 of the mold mounting vehicle 23 is also moved backward. Then, when the mold-mounted vehicle 23 retreats to the retreating position, the movement is stopped by abutting the stopper 54 at the retreat limit with the mold-mounted vehicle 23.

Next, the mold moving carriage 29 on the base 26 is moved from one side to the other side, and the mold mounting portion 67 of the first mold changing device 38 on which the mold 21 to be used next time is mounted is a mold. Move to the mold exchangeable position 71. Then, the servomotor 45 is driven again in the same manner as in the above method, and the mold mounting portion 67 of the mold mounting vehicle 23 on which the intermediate member 33 and the mold 21 are mounted moves toward the injection molding machine 11, and the mold is formed. The mold mounting portion 67 stops at the replacement position. Next, the lift device of the injection molding machine 11 is lifted to receive the mold 21 from the mold mounting portion 67. After that, the mold mounting portion 67 of the mold changing device 22 retracts in a state where nothing is placed. On the other hand, the mold 21 is attached to the injection molding machine 11. In this case as well, in the case where the lift device is not used, the upper movable mold 18 can be moved while the mold 21 in which the movable mold 18 and the fixed mold 20 are coupled and locked is mounted on the mold mounting portion 67. It may be fixed to the board 15 first.

Although the present invention is not listed one by one, it is not limited to the above-described embodiment, and those skilled in the art have been modified based on the gist of the present invention or a part of each of the above-described embodiments is individually described. It goes without saying that it also applies to those combined with. The injection molding machine in the present embodiment is a vertical injection molding machine, but it may be a horizontal injection molding machine. In the case of a horizontal injection molding machine, the mold transfer device 25 and the mold changing device 22 are provided at lateral positions of the fixed plate of the injection molding machine and the movable plate in the mold open state. The side on which the mold transfer device 25 and the mold changing device 22 are provided may be either the side on the operating side or the side on the opposite side.

Further, the molding machine of the present invention is not limited to an injection molding machine as long as it is a molding machine that uses a mold. Specifically, a die casting machine, a press molding machine, a compression molding machine, a hollow molding machine, a foam molding machine, a vacuum molding machine, a casting molding machine, a transfer molding machine and the like may be used. The types of vertical and horizontal mechanisms of these molding machines are not limited, and the molded products to be molded are not limited.

11 Vertical injection molding machine (injection molding machine)
21 Die 22 Die changer 23 Die-equipped vehicle (second advancing / retreating member)
29 Mold moving trolley 30 Mold replacement support stand 33 Intermediate member (first advancing / retreating member)
38 First mold changing device 39 Second mold changing device 40 Base member 45 Servo motor (motor)
48 Sprocket (Drive Sprocket)
56, 57, 65, 72 Chain mounting member 59 Chain (first chain)
61,62 sprockets (driven sprockets)
63,64 chains (second chain)
66 Main body 67 Mold mounting part

Claims (4)

In the mold changing device of a molding machine that carries in or out the mold in the horizontal direction with respect to the molding machine.
The driving means of the mold changer is an electric motor,
A first advancing / retreating member that advances / retreats with respect to the base member via the first chain or belt by driving the electric motor.
A first via a second chain or belt, a part of which is attached to the base member and a part of the first advancing / retreating member is displaced forward with respect to the advancing / retreating member of the first advancing / retreating member. Mold exchange of a molding machine, characterized in that a second advancing / retreating member is provided, which can advance / retreat in the same direction as the advancing / retreating member of the advancing / retreating member and can advance to the front of the advancing / retreating position of the first advancing / retreating member. apparatus. In the mold changing device of a molding machine that carries in or out the mold in the horizontal direction with respect to the molding machine.
The motor attached to the base member and
With a drive sprocket or drive pulley fixed to the drive shaft of the motor,
With a first chain or belt meshed with the drive sprocket or drive pulley,
A first advancing / retreating member attached to the first chain or belt and advancing / retreating with respect to the base member.
A driven sprocket or driven pulley that is rotatably attached to the first advancing / retreating member,
A second chain or belt that is wound around the driven sprocket or driven pulley and is partially attached to the base member and displaced as the first advancing / retreating member advances / retreats.
A part is attached to a mounting member provided on the second chain or belt and displaced forward, and the member is moved forward or backward with respect to at least the first advancing / retreating member , and to the front of the advancing position of the first advancing / retreating member. A mold changing device for a molding machine, which comprises a second advancing / retreating member capable of advancing. 1. The mold changing device for a molding machine according to claim 2. In the control method of the mold changing device of the molding machine that carries in or out the mold in the horizontal direction with respect to the molding machine.
The electric motor of the driving means of the mold changer is a servomotor.
A first advancing / retreating member that advances / retreats with respect to the base member via the first chain or belt by driving the servomotor.
A part is attached to the base member, and a part of the first advancing / retreating member is displaced forward with respect to the advancing / retreating member of the first advancing / retreating member via a second chain or belt. It is provided with a second advancing / retreating member that can advance / retreat in the same direction as the advancing / retreating direction of the advancing / retreating member and can advance to the front from the advancing position of the first advancing / retreating member.
At the time of advancing and retreating of the second advancing / retreating member, the speed is controlled by the servomotor and the speed is controlled.
A method for controlling a mold changing device of a molding machine, characterized in that when the second advancing / retreating member is stopped, it comes into contact with a stopper and is stopped.

Images