JP5481174B2 - Slide table type vertical injection molding machine - Google Patents

Description

  The present invention relates to a slide table type vertical injection molding machine including a slide table for moving a mold alternately between a mold clamping position and a working position, and more particularly to a means for improving workability and safety.

  Conventionally, a slide table that is slidably arranged on a base plate is driven to reciprocate linearly using a drive means having a motor and a ball screw mechanism, and a lower mold mounted on the slide table is moved to a predetermined clamping position. There has been proposed a slide table type vertical injection molding machine that can be alternately moved to a working position (retracted position) (see, for example, Patent Document 1).

  In the slide table type vertical injection molding machine described in Patent Document 1, since the screw shaft constituting the ball screw mechanism is passed through the slide table, the molding machine is compared with the case where the screw shaft is arranged on the side surface of the slide table. Since there is no need to work away from the screw shaft when setting the insert product in the lower mold at the work position or taking out the molded product from the lower mold, the work efficiency is improved. Can be improved.

JP 2002-1756 A

  By the way, in a molding factory, in order to be able to freely set a line layout, it is required to appropriately change an operator's standing position with respect to a slide table type vertical injection molding machine. In the slide table type vertical injection molding machine, after the injection filling process is completed, the mold attached to the slide table is moved from the mold clamping position to the working position, so that the mold is moved to the working position. In principle, it is possible to perform operations such as setting an insert product and taking out a molded product from not only the end surface side of the slide table but also the right side surface or the left side surface. However, when the mold is mounted at a fixed mold mounting position determined on the slide table, the distance to the mold mounting position changes according to the operator's standing position, so the operator can work in a cramped posture. In practice, it is difficult to perform a desired work with high efficiency from any of the end surface side, the right side surface, and the left side surface of the slide table. For example, when the mold mounting position for the slide table is determined so that the operator standing on the end surface side of the slide table can work easily, the operator stands on the right side or the left side of the slide table and works. Attempting to do so increases the distance from the operator's standing position to the mold mounting position, so the operator must work while standing, and the operator is likely to get tired and work efficiency is reduced. . Patent Document 1 does not disclose any technique for adjusting the mounting position of the mold in accordance with the standing position of the operator. Therefore, depending on the slide table type vertical injection molding machine described in Patent Document 1, depending on the molding factory, It is impossible to meet the technical requirement to increase the flexibility of layout.

  In addition, the slide table type vertical injection molding machine has a high level of safety so that operators and other people do not collide with these moving objects because the heavy-weight slide table and mold move back and forth linearly. Is required. That is, as described above, the slide table type vertical injection molding machine can access any one of the end surface side, the right side surface, and the left side surface of the slide table. Even if work is performed while confirming safety, there is a risk of collision with moving objects when a person other than the operator who is working inadvertently enters a place other than the operator's standing position. It is necessary to prevent it. Patent Document 1 does not disclose any technology related to ensuring the safety of operators and other persons, and cannot respond to such technical requests.

  The present invention has been made to eliminate such deficiencies in the prior art, and an object of the present invention is to increase the degree of freedom of layout in a molding factory and to improve productivity and safety. The object is to provide a type vertical injection molding machine.

  In order to solve the above problems, the present invention provides a slide table slidably disposed on a base plate, a mold mounted on the slide table by a mold mounting means, and a predetermined mold clamping. In a slide table type vertical injection molding machine provided with a driving means for reciprocating linearly driving the slide table so as to alternately move between a position and a working position, the mold attaching means is provided on the slide table. The screw hole and a fastening bolt screwed into the screw hole, and the screw hole is either at a position where the mold can be attached to the central portion on the slide table, or more than the central portion. It was set as the structure which opens in the position which can attach the said metal mold | die near one edge side, and the position which can attach the said metal mold | die near either one side rather than a center part.

  According to such a configuration, by changing the screw hole into which the fastening bolt for fixing the die is screwed, the die is appropriately attached to the central portion on the slide table, the end side, and the side side. Therefore, the distance from the operator standing position to the mold mounting position can be optimized regardless of the operator standing position with respect to the slide table type vertical injection molding machine. Therefore, the operator can work in a comfortable posture, can reduce the fatigue of the operator, and can maintain a high work efficiency. In addition, since the operator's standing position with respect to the slide table type vertical injection molding machine can be changed as appropriate, the degree of freedom of layout in the molding factory can be increased.

  Further, in order to solve the above-mentioned problems, the present invention uses the left and right hands by the operator at a portion that is outside the moving range of the slide table and that is opposed to the end side and side portion of the slide table. A push button of a two-hand push switch that starts movement of the slide table by the driving means by operating simultaneously is provided.

  According to such a configuration, in order to start the movement of the slide table, it is necessary for the operator to operate the push buttons of the two-hand push switch at the same time using both left and right hands. The move will not start. Further, since the push button of the two-hand push switch is provided outside the moving range of the slide table, it is difficult for the operator's body to inadvertently touch the moving slide table and the mold. From these, the safety of the operator can be ensured.

  According to another aspect of the present invention, the drive means includes an electric servo motor, a screw shaft connected to an output shaft of the electric servo motor, and a rotational motion of the screw shaft that is a linear motion of the slide table. It consists of a nut body that converts to.

  According to this configuration, the slide table (die) can be accurately stopped at an arbitrary predetermined stop position based on the output signal of the rotary encoder provided in the electric servo motor. It is possible to easily cope with a change in the mounting position of the mold.

  In order to solve the above problems, the present invention is configured to include a mold position detection sensor that detects that the mold is in the mold clamping position and that the mold is in the working position.

  According to such a configuration, it is possible to detect whether or not the slide table (die) is stopped at a predetermined mold clamping position or working position. Therefore, the slide table (die) due to a failure of the rotary encoder provided in the electric servomotor or the like. ) Can be detected and the reliability of the molding machine can be improved.

  According to the present invention, the mold attachment means includes a screw hole formed in the slide table and a fastening bolt screwed into the screw hole, and the screw hole is formed in the center portion on the slide table. Is opened at a position where one can be attached closer to either end than the center, and a position where one can be attached closer to either side than the center. Therefore, the mounting position of the mold with respect to the slide table can be changed as appropriate by changing the screw hole into which the fastening bolt is screwed. Therefore, regardless of the operator's standing position with respect to the slide table type vertical injection molding machine, the distance from the operator's standing position to the mold mounting position can be optimized, and the operator's fatigue can be reduced. High work efficiency can be maintained. In addition, since the operator's standing position with respect to the slide table type vertical injection molding machine can be changed as appropriate, the degree of freedom of layout in the molding factory can be increased.

It is a perspective view of a slide table type vertical injection molding machine according to an embodiment. It is a top view of the operation part concerning an embodiment. It is a side view of the work part concerning an embodiment. It is an end view of a work part concerning an embodiment. It is principal part sectional drawing which shows the attachment method of the lower metal mold | die with respect to the slide table which concerns on embodiment. It is a top view which illustrates the attachment position of the lower metal mold | die with respect to the slide table which concerns on embodiment.

  Hereinafter, a slide table type vertical injection molding machine according to an embodiment will be described with reference to the drawings. The slide table type vertical injection molding machine of this example is a horizontal injection type in which molten resin is injected and filled into a mold cavity from the side of the mold, and as shown in FIG. A molten resin injection filling part 2 arranged on the side of the clamping part 1, a working part 3 protruding from the mold clamping part 1 in a direction perpendicular to the injection filling part 2, and a hinge 5 on the working part 3 It is mainly comprised from the controller 4 attached so that turning was possible. The controller 4 includes an input device and a display device.

  The mold clamping unit 1 includes a tie bar 11, a fixed die plate (not shown) to which a slide table 13 is attached, a lower mold 14 (see FIGS. 5 and 6) fixed to the slide table 13, and an upper end portion of the tie bar 11. A movable die plate 12 fixed to the tie bar 11 and moved up and down together with the tie bar 11, an upper die (not shown) attached to the movable die plate 12 and opened and closed with respect to the lower die 14, and a lower end of the tie bar 11 (not shown). There is a mold clamping means (not shown) provided between the tail stock and the fixed die plate and the tail stock. The upper die can be attached to the movable die plate 12, or is configured as a separate body independent of the movable die plate 12, and is integrated with the lower die 14 so that the mold clamping part 1 and the working part are connected to each other. It can also be configured to reciprocate between.

  The injection filling unit 2 includes a heating cylinder 21 in which an injection screw (not shown) is incorporated, a hopper 22 that supplies a pellet-shaped raw resin into the heating cylinder 21, and an injection device 23 that rotates and moves the injection screw forward and backward. have.

  As shown in FIGS. 2 to 4, the working unit 3 includes a base plate 32 mounted on the base frame 31, two guide rails 33 provided in parallel along the long side of the base plate 32, A slide block 34 that is attached to the lower surface of the slide table 13 and is combined with the guide rail 33, and driving means 35 that drives the slide table 13 to reciprocate linearly along the guide rail 33. The drive means 35 is for screwing the screw shaft 38 with an electric servo motor 36 attached to the base plate 32, a screw shaft 38 connected to the output shaft of the electric servo motor 36 via a required coupling 37. A screw hole is opened and the nut body 39 is attached to the lower surface of the slide table 13. The screw shaft 38 and the nut body 39 constitute a ball screw mechanism, and the rotational motion of the electric servo motor 36 (screw shaft 38) is converted into the linear motion of the nut body 39 and transmitted to the slide table 13, and the slide table. 13 is moved to a mold clamping position P1 and a work position P2 shown in FIG. As the guide rail 33 and the sliding block 34, an LM guide comprising a combination of an LM rail and an LM block can be used. In this way, the drive means of the slide table 13 is attached to the electric servo motor 36, the screw shaft 38 connected to the output shaft of the electric servo motor 36, and the lower surface of the slide table 13, and the screw shaft 38 is screwed together. When constituted by a ball screw mechanism comprising a nut body 39, the slide table 13 (lower die 14) is brought to a predetermined arbitrary stop position based on an output signal of a rotary encoder provided in the electric servo motor 36. Since it can be stopped accurately, it is possible to easily cope with a change in the mounting position of the lower mold 14 with respect to the slide table 13.

  As shown in FIG. 2, the base plate 32 includes a first proximity sensor 40a for detecting whether or not the slide table 13 has stopped at a predetermined mold clamping position P1, and the slide table 13 stopped at a predetermined work position P2. And a second proximity sensor 40b for detecting whether or not the operation has been performed. In the present embodiment, when the slide table 13 stops at a predetermined mold clamping position P1, an ON signal is output from the first proximity sensor 40a, and an OFF signal is output from the second proximity sensor 40b. When the slide table 13 stops at the predetermined work position P2, an OFF signal is output from the first proximity sensor 40a, and an ON signal is output from the second proximity sensor 40b. As described above, in the slide table type vertical injection molding machine according to the present embodiment, the output signal is selected when the slide table 13 stops at the predetermined mold clamping position P1 and when the slide table 13 stops at the predetermined work position P2. Since the proximity sensors 40a and 40b are arranged so as to be switched automatically, the controller 4 monitors the output signals of the proximity sensors 40a and 40b and the output signal of the rotary encoder provided in the electric servo motor 36. Thus, a failure of each part of the machine can be detected.

  That is, since the controller 4 can obtain the movement position of the slide table 13 relative to the base plate 32 from the output signal of the rotary encoder by calculation, it is determined whether or not the slide table 13 has reached the predetermined mold clamping position P1, and The controller 4 can also determine whether or not the slide table 13 has reached the predetermined work position P2. However, even when it is determined from the output signal of the rotary encoder that the slide table 13 has reached the predetermined mold clamping position P1 or the work position P2, the first and second proximity sensors 40a and 40b are both ON. Alternatively, when both are OFF, the slide table 13 has not actually reached the predetermined mold clamping position P1 or the working position P2, so that it can be seen that a failure has occurred in the rotary encoder or the drive means 35 of the slide table 13.

  A plurality of screw holes 41 for attaching lower molds are formed at the four corners of the slide table 13, and five eject pin through holes 42 a to 42 e are equally divided at the center of the slide table 13. It has been established. On the other hand, the eject pins 43a to 43e are set to be movable up and down at portions corresponding to the opening positions of the eject pin through holes 42a to 42e at the take-out position P2 of the base plate 32.

  As shown in FIG. 5, the lower mold 14 includes a fastening bolt 44 that is screwed into any of the plurality of screw holes 41, and a fixing plate 45 that transmits a tightening force of the fastening bolt 44 to the lower mold 14. Then, it is fixed on the slide table 13 by using a mold attaching means comprising a spacer 46 that supports the lower surface of the fixing plate 45. The fixing plate 45 and the spacer 46 can be integrated. As described above, in the slide table type vertical injection molding machine according to the present embodiment, a plurality of screw holes 41 for attaching the lower mold are opened at the four corners of the slide table 13, and the fastening bolts 44 are screwed together. By appropriately selecting the screw hole 41 to be performed, as shown in FIG. 6, the lower mold 14 is also located at the center portion of the slide table 13, at a position biased closer to either one end than the center portion, It is possible to fix to a position biased closer to either one side than the central portion. As a result, when the operator stands on the end side of the slide table 13 or when the operator stands on the side of the slide table 13, the lower mold 14 is positioned at a position where the operator can easily work. Since the insert can be set in the lower mold 14 and the molded product can be taken out from the lower mold 14, workability can be improved.

  The eject pin through-holes 42a to 42e are respectively a center portion of the slide table 13, a position biased closer to one end side than the center portion, and a position biased closer to any one side than the center portion. And will be opened. The eject pin through hole 42a at the center is used to project the eject pin 43a when the lower mold 14 is attached to the center of the slide table 13. The lower die 14 is attached to the eject pin through holes 42b and 42c that are biased closer to one end side than the central portion at a position that is biased closer to one end side than the central portion of the slide table 13. This is used to eject the eject pins 43b and 43c. Further, the eject pin through holes 42d and 42e that are biased closer to one side than the central portion are positioned so that the lower mold 14 is positioned closer to either side than the central portion of the slide table 13. It is used for ejecting the eject pins 43d and 43e when attached.

  As shown in FIGS. 1 and 2, the periphery of the working unit 3 is surrounded by a structure including four columns 51 a to 51 d and three beams 52 connecting adjacent columns, and slides. On the lower outer surface of the two pillars 51a and 51b facing the end sides of the table 13, the operator operates the electric servo motor 36 simultaneously with both left and right hands to activate the movement of the slide table 13. Push buttons 53a and 53b of a two-hand push switch for starting are provided. In addition, push buttons 53c and 53d of a double-handed push switch similar to those described above are also provided on the lower outer surfaces of the two columns 51b and 51c facing one side of the slide table 13. Although illustration is omitted, a push button of a two-hand push switch similar to the above can be provided on the lower outer surface of the two columns 51a, 51d facing the other side of the slide table 13. The operation states of the push buttons 53a, 53b and 53c, 53d are monitored by a controller (not shown). When the push button 53a and the push button 53b or the push button 53c and the push button 53d are operated at the same time, the controller 4 operates the electric servo. The drive signal of the motor 36 is output and the drive of the slide table 13 is started.

  Thus, when the pushbuttons 53a, 53b and 53c, 53d of the two-hand push switch are provided on the lower outer surface of the two columns 51a, 51b and 51b, 51c corresponding to each standing position of the operator, the operator uses both left and right hands. Since the movement of the slide table 13 is not started unless the push buttons 53a, 53b or 53c, 53d of the two-hand push switch are operated at the same time, the movement of the slide table 13 and the mold is not started at a timing not intended by the operator. . Further, since the push buttons 53a, 53b and 53c, 53d of the two-hand push switch are provided outside the moving range of the slide table 13, the operator's body is unlikely to contact the moving slide table 13 and the mold carelessly. . Therefore, the safety of the operator can be ensured from these things. Note that which of the two sets of push buttons 53a, 53b and 53c, 53d is enabled is set on the controller 4 side according to the standing position of the operator.

  Further, a line-shaped light emitter 54a for detecting that an operator or another person has approached the facing surfaces of the two columns 51a and 51b facing the end sides of the slide table 13, and the line-shaped light emission. A first area sensor comprising a combination of line-shaped light receivers 55a for receiving the light from the receiver 54a is provided. Further, a second area sensor comprising a combination of the light emitter 54b and the light receiver 55b similar to the above is provided on the opposing surfaces of the two columns 51b and 51c facing one side of the slide table 13. . Although not shown, a third area sensor comprising a combination of a light emitter and a light receiver similar to the above is provided on the opposing surfaces of the two columns 51a and 51d that face the other side of the slide table 13. It can also be provided. The light receiving state of the light emitted from the light emitters 54a and 54b by the light receivers 55a and 55b is monitored by the controller 4, and the light emission of the light emitters 54a and 54b to be received by the light receivers 55a and 55b is cut off. In this case, the controller 4 can stop the operation of the injection molding machine.

  As described above, the first and second area sensors are provided on the opposing surfaces of the two pillars 51a, 51b and 51b, 51c corresponding to the respective standing positions of the operator, and any one of the area sensors is provided by the operator or another person. When the controller 4 is configured to stop the operation of the injection molding machine when the other area sensor detects the approach of the operator or another person while the approach is being detected, the controller 4 has inadvertently approached the injection molding machine. Since it is possible to prevent an accident such as a person coming into contact with the movable part of the injection molding machine, the safety of the injection molding machine can be improved.

  Hereinafter, the usage method and operation of the slide table type vertical injection molding machine according to the present embodiment will be described.

  When using the slide table type vertical injection molding machine, first, the lower mold 14 is attached to the slide table 13. The lower mold 14 is attached to the slide table 13 using the mold attaching means shown in FIG. 5 in a state where the slide table 13 is moved to the work position P2 stored in the controller 4 in advance. At that time, an optimal screw hole 41 for screwing the fastening bolt 43 as the die attachment means is appropriately selected in accordance with the attachment position of the lower die 14 with respect to the slide table 13. Thereby, the setting position of the lower mold 14 can be adjusted in accordance with the standing position of the operator so that the operator can work in a comfortable posture. Further, in the case of using a mold in which the spool for receiving the molten resin supplied from the injection filling unit 2 is not opened at the center of the mold, the setting position of the lower mold 14 is shifted from the center of the slide table 13. As a result, the opening position of the spool can be set at the center of the slide table 13.

  After the lower die 14 is attached to the slide table 13, the electric servo motor 36 is driven to move the slide table 13 to the mold clamping position P1, and the fine adjustment of the drive of the electric servo motor 36 is performed. The opening position is matched with the setting position of the injection nozzle provided in the injection filling device 2. The matched position is stored in the controller 4 as a mold clamping position P1. Further, the injection filling device 2 is driven to determine the forward and backward positions of the injection nozzle, and these are stored in the controller 4.

  Thereafter, the controller 4 is operated to start the continuous molding operation. At that time, the operator can set the end side of the slide table 13 as the standing position according to the mounting position of the lower mold 14 with respect to the slide table 13, or set the side side of the slide table 13 as the standing position. You can also

  The present invention can be used for a slide table type vertical injection molding machine.

DESCRIPTION OF SYMBOLS 1 Mold clamping part 2 Injection filling part 3 Working part 4 Controller 11 Tie bar 12 Movable die plate 13 Slide table 14 Lower mold 21 Heating cylinder 22 Hopper 23 Injection device 31 Base frame 32 Base plate 33 Guide rail 34 Sliding block 35 Driving means 36 Electric servo motor 37 Coupling 38 Screw shaft 39 Nut body 40a, 40b Proximity sensor 41 Screw hole for attaching lower die 42a to 42e Eject pin through hole 43a to 43e Eject pin 44 Fastening bolt 45 Fixing plate 46 Spacer 51a to 51d Column 52 Beams 53a to 53d Pushbuttons 54a and 54b of both hand push switches Area sensor light emitters 55a and 55b Area sensor light receivers

Claims (4)

A slide table that is slidably disposed on the base plate, a mold that is mounted on the slide table by a mold mounting means, and the mold is alternately moved to a predetermined mold clamping position and a working position. In addition, a slide table type vertical injection molding machine provided with driving means for reciprocating linearly driving the slide table,
The mold attaching means includes a screw hole established in the slide table and a fastening bolt screwed into the screw hole, and the screw hole is formed in the middle portion on the slide table. At a position where one of the molds can be attached closer to one end side than the central part, and a position where the mold can be attached closer to one side side than the central part A slide table type vertical injection molding machine characterized by its establishment.   When the operator operates the left and right hands at the same time, using the left and right hands, on the part that is outside the moving range of the slide table and that is opposed to the side and the side of the slide table, the slide by the driving means 2. The slide table type vertical injection molding machine according to claim 1, further comprising a push button of a two-hand push switch for starting the movement of the table.   The drive means comprises an electric servo motor, a screw shaft connected to the output shaft of the electric servo motor, and a nut body that converts the rotational motion of the screw shaft into the linear motion of the slide table. The slide table type vertical injection molding machine according to any one of claims 1 and 2.   4. The mold position detection sensor according to claim 1, further comprising: a mold position detection sensor configured to detect that the mold is in the mold clamping position and that the mold is in the working position. The slide table type vertical injection molding machine described in the paragraph.

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