JP5764020B2 - Injection molding machine - Google Patents

Description

  The present invention relates to an injection molding machine including an electromagnet that drives a mold clamping operation.

  2. Description of the Related Art Conventionally, in an injection molding machine, resin is injected from an injection nozzle of an injection device, filled into a cavity space between a fixed mold and a movable mold, and solidified to obtain a molded product. ing. A mold clamping device is provided to move the movable mold relative to the fixed mold to perform mold closing, mold clamping, and mold opening.

  The mold clamping device includes a hydraulic mold clamping device that is driven by supplying oil to a hydraulic cylinder, and an electric mold clamping device that is driven by an electric motor. It is widely used because it has high controllability, does not pollute the surroundings, and has high energy efficiency. In this case, by driving the electric motor, the ball screw is rotated to generate a thrust, and the thrust is expanded by a toggle mechanism to generate a large mold clamping force.

  However, since the electric type mold clamping device having the configuration uses a toggle mechanism, it is difficult to change the mold clamping force due to the characteristics of the toggle mechanism, and the responsiveness and stability are improved. Unfortunately, the clamping force cannot be controlled during molding. Therefore, a mold clamping device is provided in which the thrust generated by the ball screw can be directly used as a mold clamping force. In this case, since the torque of the electric motor and the mold clamping force are proportional, the mold clamping force can be controlled during molding.

  However, in the conventional mold clamping device, the load resistance of the ball screw is low, and not only a large mold clamping force cannot be generated, but also the mold clamping force fluctuates due to torque ripple generated in the electric motor. In addition, in order to generate the mold clamping force, it is necessary to constantly supply current to the motor, and the power consumption and heat generation amount of the motor increase. Therefore, it is necessary to increase the rated output of the motor by that amount. The cost of the device becomes high.

  Therefore, a mold clamping device using a linear motor for the mold opening / closing operation and utilizing the attractive force of an electromagnet for the mold clamping operation is conceivable (for example, Patent Document 1).

WO05 / 090052 pamphlet

  By the way, in the injection molding machine, a mechanical stopper mechanism for forcibly stopping the mold opening / closing operation when a predetermined condition is satisfied is provided for mold protection and the like. In a configuration using a toggle mechanism for mold clamping operation, the stopper mechanism is, for example, a rod-shaped member fixed to the movable platen and formed with a groove, and a locking member provided on the rear platen and fitted in the groove of the rod-shaped member. The mechanical locking is realized by driving the locking member and fitting the locking member in the groove of the rod-shaped member.

  On the other hand, in the case of using a mold clamping device that uses the attractive force of an electromagnet as described in Patent Document 1, if a rod-shaped member is provided between the movable platen and the rear platen, the gap between the movable platen and the rear platen is set. Since the distance is changed by adjusting the mold thickness, there arises a problem that the length of the rod-like member becomes relatively long. That is, the length of the rod-shaped member should be determined based on the maximum distance between the movable platen and the rear platen (minimum mold thickness). Also need to be long.

  Accordingly, the present invention provides an injection molding machine capable of minimizing the length of the rod-shaped member constituting the stopper mechanism while adopting a mold clamping force generating mechanism that generates a mold clamping force with an attractive force of an electromagnet. With the goal.

In order to achieve the above object, according to one aspect of the present invention, a first fixing member to which a fixed mold is attached;
A second fixing member disposed opposite to the first fixing member;
A first movable member to which a movable mold is attached;
A second movable member that is connected to the first movable member and moves together with the first movable member, and generates a mold clamping force by an attractive force of an electromagnet in cooperation with the second fixed member. A second movable member constituting a mold clamping force generating mechanism to be caused;
One end is provided between the second movable member and the second fixed member, one end of the second movable member and the second fixed member is fixed to the second movable member, and the second fixed member. A rod-like member whose other end extends to the other of the movable member and the second fixed member,
A locking member that is movable between an engagement position that engages with the rod-shaped member and a disengagement position that separates from the rod-shaped member, and the second movable member is moved when in the engagement position. An injection molding machine is provided, comprising: a locking member for preventing.

  ADVANTAGE OF THE INVENTION According to this invention, the injection molding machine which can suppress the length of the rod-shaped member which comprises a stopper mechanism to the minimum is obtained, employ | adopting the mold clamping force generation | occurrence | production mechanism which generate | occur | produces mold clamping force with the attraction force by an electromagnet. It is done.

It is a figure which shows the state at the time of the mold closing of the mold clamping apparatus in the injection molding machine of embodiment of this invention. It is a figure which shows the state at the time of the mold opening of the mold clamping apparatus in the injection molding machine of embodiment of this invention. It is a figure which shows one Example of the stopper mechanism. 5 is a cross-sectional view showing an example of an operation mode of a stopper mechanism 90. FIG. It is a figure which shows stopper mechanism 90 'by other one Example. It is sectional drawing which shows the state which the latching member 94 fitted in stopper groove | channel 93 '.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In the present embodiment, for the mold clamping device, the moving direction of the movable platen when closing the mold is the front, the moving direction of the movable platen when opening the mold is the rear, and the injection device is the injection The description will be made assuming that the moving direction of the screw when performing the measurement is the front and the moving direction of the screw when performing the measurement is the rear.

  FIG. 1 is a diagram showing a state when a mold clamping device is closed in an injection molding machine according to an embodiment of the present invention, and FIG. 2 is a state when the mold clamping device is opened in the injection molding machine according to the embodiment of the present invention. FIG. In FIGS. 1 and 2, the hatched members show the main cross section.

  In the figure, 10 is a mold clamping device, Fr is a frame (frame) of an injection molding machine, Gd is a guide movable with respect to the frame Fr, 11 is a guide not shown or fixed on the frame Fr. A rear platen 13 is disposed at a predetermined distance from the fixed platen 11 and opposed to the fixed platen 11, and four tie bars 14 (in the figure) are disposed between the fixed platen 11 and the rear platen 13. Shows only two of the four tie bars 14). The rear platen 13 is fixed with respect to the frame Fr.

  A screw portion (not shown) is formed at the front end portion (right end portion in the figure) of the tie bar 14, and the front end portion of the tie bar 14 is fixed to the fixed platen 11 by screwing and tightening the nut n1 to the screw portion. Is done. The rear end of the tie bar 14 is fixed to the rear platen 13.

  A movable platen 12 is disposed along the tie bar 14 so as to face the fixed platen 11 so as to be movable back and forth in the mold opening / closing direction. For this purpose, the movable platen 12 is fixed to the guide Gd, and a guide hole or notch (not shown) for penetrating the tie bar 14 is formed at a position corresponding to the tie bar 14 in the movable platen 12. A suction plate 22 described later is also fixed to the guide Gd. As shown in the figure, the guide Gd may be provided separately for each of the suction plate 22 and the movable platen 12, or may be configured by a single unit common to the suction plate 22 and the movable platen 12. .

A fixed mold 15 is fixed to the fixed platen 11 and a movable mold 16 is fixed to the movable platen 12. The fixed mold 15 and the movable mold 16 are brought into contact with and separated from each other as the movable platen 12 advances and retreats. Then, mold closing, mold clamping and mold opening are performed. As the mold clamping is performed, a cavity space (not shown) is formed between the fixed mold 15 and the movable mold 16, and resin (not shown) injected from the injection nozzle 18 of the injection device 17 is formed in the cavity space. It is Filling in. A mold device 19 is configured by the fixed mold 15 and the movable mold 16.

  The suction plate 22 is fixed to the guide Gd in parallel with the movable platen 12. As a result, the suction plate 22 can move forward and backward behind the rear platen 13. The suction plate 22 may be formed of a magnetic material. For example, the suction plate 22 may be configured by an electromagnetic laminated steel plate formed by laminating thin plates made of a ferromagnetic material. Alternatively, the suction plate 22 may be formed by casting.

  The linear motor 28 is provided on the guide Gd in order to advance and retract the movable platen 12. The linear motor 28 includes a stator 29 and a mover 31, and the stator 29 is formed on the frame Fr in parallel with the guide Gd and corresponding to the moving range of the movable platen 12. Is formed at a lower end of the movable platen 12 so as to face the stator 29 and over a predetermined range.

  The mover 31 includes a core 34 and a coil 35. The core 34 includes a plurality of magnetic pole teeth 33 that are protruded toward the stator 29 and formed at a predetermined pitch, and the coil 35 is wound around each magnetic pole tooth 33. The magnetic pole teeth 33 are formed in parallel to each other in a direction perpendicular to the moving direction of the movable platen 12. The stator 29 includes a core (not shown) and a permanent magnet (not shown) formed to extend on the core. The permanent magnet is formed by alternately magnetizing the N and S poles. When the linear motor 28 is driven by supplying a predetermined current to the coil 35, the movable element 31 is advanced and retracted, and accordingly, the movable platen 12 is advanced and retracted by the guide Gd to perform mold closing and mold opening. it can.

  In the present embodiment, the permanent magnet is disposed on the stator 29 and the coil 35 is disposed on the mover 31, but the coil is disposed on the stator and the permanent magnet is disposed on the mover. You can also. In this case, since the coil does not move as the linear motor 28 is driven, wiring for supplying power to the coil can be easily performed.

  The movable platen 12 and the suction plate 22 are not limited to be fixed to the guide Gd, and a movable element 31 of the linear motor 28 may be provided on the movable platen 12 or the suction plate 22. Further, the mold opening / closing mechanism is not limited to the linear motor 28, and may be a hydraulic type or an electric type.

  When the movable platen 12 is moved forward and the movable mold 16 abuts against the fixed mold 15, the mold is closed and subsequently the mold is clamped. An electromagnet unit 37 for clamping the mold is disposed between the rear platen 13 and the suction plate 22. A center rod 39 that extends through the rear platen 13 and the suction plate 22 and connects the movable platen 12 and the suction plate 22 is disposed so as to freely advance and retract. The center rod 39 advances and retracts the attracting plate 22 in conjunction with the advance and retreat of the movable platen 12 when the mold is closed and opened, and transmits the attracting force generated by the electromagnet unit 37 to the movable platen 12 when the mold is clamped. To do.

  The fixed platen 11, the movable platen 12, the rear platen 13, the suction plate 22, the linear motor 28, the electromagnet unit 37, the center rod 39, and the like constitute the mold clamping device 10.

  The electromagnet unit 37 includes an electromagnet 49 formed on the rear platen 13 side and a suction portion 51 formed on the suction plate 22 side. Further, a predetermined portion of the rear end surface of the rear platen 13, in this embodiment, a groove 45 is formed around the center rod 39, a core 46 is formed inside the groove 45, and a yoke 47 is formed outside the groove 45. Is done. A coil 48 is wound around the core 46 in the groove 45. The core 46 and the yoke 47 are formed of an integral casting structure, but may be formed by laminating thin plates made of a ferromagnetic material to form an electromagnetic laminated steel plate.

  In the present embodiment, the electromagnet 49 may be formed separately from the rear platen 13, and the adsorption portion 51 may be formed separately from the adsorption plate 22, or the electromagnet may be adsorbed as a part of the rear platen 13 and adsorbed as a part of the adsorption plate 22. A part may be formed. Further, the arrangement of the electromagnet and the attracting part may be reversed. For example, the electromagnet 49 may be provided on the suction plate 22 side, and the suction portion may be provided on the rear platen 13 side.

  When an electric current is supplied to the coil 48 in the electromagnet unit 37, the electromagnet 49 is driven to attract the attracting part 51 and generate a mold clamping force.

  The center rod 39 is connected to the suction plate 22 at the rear end and is connected to the movable platen 12 at the front end. Therefore, the center rod 39 is advanced together with the movable platen 12 when the mold is closed to advance the suction plate 22, and is retracted together with the movable platen 12 when the mold is opened to retract the suction plate 22. For this purpose, a hole 41 through which the center rod 39 passes is formed in the central portion of the rear platen 13.

  The driving of the linear motor 28 and the electromagnet 49 of the mold clamping device 10 is controlled by the control unit 60. The control unit 60 includes a CPU, a memory, and the like, and also includes a circuit for supplying current to the coil 35 of the linear motor 28 and the coil 48 of the electromagnet 49 according to the result calculated by the CPU. A load detector 55 is also connected to the control unit 60. The load detector 55 is installed at a predetermined position (a predetermined position between the fixed platen 11 and the rear platen 13) of at least one tie bar 14 in the mold clamping device 10, and detects a load applied to the tie bar 14. . In the drawing, an example in which a load detector 55 is installed on two upper and lower tie bars 14 is shown. The load detector 55 is constituted by, for example, a sensor that detects the extension amount of the tie bar 14. The load (strain) detected by the load detector 55 is sent to the control unit 60. The controller 60 detects the mold clamping force based on the output of the load detector 55. Note that the control unit 60 is omitted for the sake of convenience in FIG.

  In the illustrated example, a mold thickness adjusting mechanism 44 is provided on the rear side of the suction plate 22. The mold thickness adjusting mechanism 44 is a mechanism that adjusts the relative position of the movable platen 12 and the suction plate 22 (that is, the distance between them) in accordance with the thickness of the mold apparatus 19. The configuration itself of the mold thickness adjusting mechanism 44 may be arbitrary. For example, the mold thickness adjusting mechanism 44 varies the position of the center rod 39 with respect to the suction plate 22 by a mold thickness adjusting motor (not shown). Thereby, the position of the center rod 39 with respect to the suction plate 22 is adjusted, and the position of the movable platen 12 with respect to the fixed platen 11 is adjusted. That is, the mold thickness is adjusted by changing the relative positions of the movable platen 12 and the suction plate 22.

  Next, the operation of the mold clamping device 10 will be described.

  The mold closing process is controlled by the mold opening / closing processor 61 of the controller 60. In the state of FIG. 2 (the state at the time of mold opening), the mold opening / closing processor 61 supplies current to the coil 35. Subsequently, the linear motor 28 is driven, the movable platen 12 is advanced, and the movable mold 16 is brought into contact with the fixed mold 15 as shown in FIG. At this time, a gap δ is formed between the rear platen 13 and the suction plate 22, that is, between the electromagnet 49 and the suction portion 51. Note that the force required for mold closing is sufficiently reduced compared to the mold clamping force.

  Subsequently, the mold clamping processing unit 62 of the control unit 60 controls the mold clamping process. The mold clamping unit 62 supplies current to the coil 48 and attracts the attracting unit 51 by the attracting force of the electromagnet 49. Along with this, the clamping force is transmitted to the movable platen 12 through the suction plate 22 and the center rod 39, and clamping is performed. When changing the clamping force such as at the start of clamping, the clamping unit 62 generates a target clamping force to be obtained by the change, that is, a target clamping force in a steady state. Control is performed so that the necessary steady-state current value is supplied to the coil 48.

The mold clamping force is detected by the load detector 55. The detected mold clamping force is sent to the control unit 60, where the current supplied to the coil 48 is adjusted so that the mold clamping force becomes a set value, and feedback control is performed. During this time, the resin was melted in the injection apparatus 17 is injected from the injection nozzle 18, it is Filling the cavity of the mold apparatus 19.

  When the resin in the cavity space is cooled and solidified, the mold opening / closing processor 61 controls the mold opening process. The mold clamping processing unit 62 stops the supply of current to the coil 48 in the state of FIG. Along with this, the linear motor 28 is driven, the movable platen 12 is moved backward, and the movable mold 16 is placed in the retracted limit position as shown in FIG.

  Here, the stopper mechanism 90 will be described with reference to FIG. 1 and 2 are sectional views, the stopper mechanism 90 is not shown. The stopper mechanism 90 may be provided on the side of the injection molding machine, for example.

  FIG. 3 is a view showing an example of the stopper mechanism 90. FIG. 4 is a cross-sectional view showing an example of an operation mode of the stopper mechanism 90, and shows an example of a mode in which the locking member 94 is fitted to the rod-shaped member 92.

  As shown in FIG. 3, the stopper mechanism 90 is provided between the rear platen 13 and the suction plate 22. Specifically, the stopper mechanism 90 includes a rod-shaped member 92 provided between the rear platen 13 and the suction plate 22 and a locking member 94.

  The rod-shaped member 92 is a high-strength / rigid member made of metal or the like, and extends between the rear platen 13 and the suction plate 22. The rod-shaped member 92 may be a round bar, a square bar, or may have an arbitrary cross-sectional shape. The rod-shaped member 92 has a length substantially corresponding to the distance between the rear platen 13 and the suction plate 22 in the mold open state (see FIGS. 2 and 3). The rod-shaped member 92 is coupled to the suction plate 22 at the rear end. The front end portion of the rod-shaped member 92 extends to the rear platen 13. The rod-shaped member 92 moves forward (see arrow Y in FIG. 3) together with the suction plate 22 when the mold is closed. It should be noted that the rod-shaped member 92 passes through the side of the rear platen 13 (the front side in the vertical direction in FIG. 3) during such forward movement (also during backward movement) and does not interfere with the rear platen 13.

  The rod-shaped member 92 has a plurality of stopper grooves 93 (five in this example). The stopper groove 93 is formed in a shape such that a later-described locking member 94 is fitted. Note that the number and interval of the stopper grooves 93 may be arbitrary. As shown in FIGS. 3 and 4, the stopper groove 93 has a cross section that reaches the bottom surface 93c on the inclined surface 93a from the front side and rises on a locking surface 93b that is perpendicular to the rear side of the bottom surface 93c.

  The locking member 94 is a high-strength and rigid member made of metal or the like, and has an end portion that fits into the stopper groove 93 of the rod-shaped member 92 as shown in FIG. The locking member 94 has an engagement position (see FIG. 4B) that fits into the stopper groove 93 of the rod-shaped member 92 and a disengagement position (see FIG. 4A) that separates from the stopper groove 93 of the rod-shaped member 92. It can be moved between. The locking member 94 is driven by an actuator (not shown).

  When the stopper mechanism 90 is not operated, the locking member 94 is held at the disengaged position (see FIG. 4A). In this case, the rod-shaped member 92 and the suction plate 22 can be moved in the direction of the rear platen 13 (see arrow Y in FIG. 3) and the opposite direction. That is, a mold opening / closing operation is possible. On the other hand, when the stopper mechanism 90 is operated, the locking member 94 is driven from the disengaged position to the engaged position (see FIG. 4B). In this case, the suction plate 22 cannot move in the direction of the rear platen 13 due to the force F (see FIG. 4B) that the bar-shaped member 92 receives from the locking surface 93 b of the stopper groove 93. That is, the suction plate 22 cannot move further forward when the rod-shaped member 92 hits the locking surface 93b of the stopper groove 93.

  The operation of the stopper mechanism 90, that is, the switching control of the position of the locking member 94 may be realized by the control unit 60. The control unit 60 drives the locking member 94 to the engagement position by an actuator (not shown) when a predetermined condition for operating the stopper mechanism 90 is satisfied. The predetermined condition is arbitrary, but may include, for example, a case where the door of the injection molding machine is opened. When the locking member 94 is driven to the engagement position, the locking member 94 is fitted into any one of the plurality of stopper grooves 93. Specifically, the plurality of stopper grooves 93 are provided so that the locking member 94 can be received even when the stopper mechanism 90 is actuated at any time during the movement of the suction plate 22 when the mold is closed. Depending on the positional relationship between the suction plate 22 and the rear platen 13 when the stopper mechanism 90 is operated, the locking member 94 may be fitted directly into the stopper groove 93 when the stopper mechanism 90 is operated. It may hit a portion other than the groove 93 and fit into the stopper groove 93 via the inclined surface 93a. The inclined surface 93a has a function of assisting the smooth fitting of the locking member 94 into the stopper groove 93 when the stopper mechanism 90 is operating during mold closing.

  In the example shown in FIGS. 3 and 4, from the viewpoint of strength against collision with the locking member 94, the plurality of stopper grooves 93 are not formed continuously but are formed apart from each other. That is, when the distance from the inclined surface 93a of the front stopper groove 93 to the engaging surface 93b of the next stopper groove 93 on the front side is zero, the top of the inclined surface 93a becomes sharp, and the engaging member 94 Therefore, a certain distance is provided between the inclined surface 93 a of the stopper groove 93 and the locking surface 93 b of the adjacent stopper groove 93. In the example shown in FIGS. 3 and 4, all of the plurality of stopper grooves 93 have a locking surface 93 b on the rear side and an inclined surface 93 a on the front side, so that the stopper mechanism 90 is substantially In addition, it works only when the mold is closed. That is, when the mold is opened, even if the locking member 94 is fitted in the stopper groove 93, the locking member 94 cannot be locked by the inclined surface 93a, so that the rearward movement of the suction plate 22 is allowed.

  As described above, according to the stopper mechanism 90 shown in FIG. 3, since the rod-shaped member 92 is provided between the rear platen 13 and the suction plate 22, the length necessary for the rod-shaped member 92 (length in the mold opening / closing direction) is The stroke for mold opening and closing is enough. On the other hand, as a comparative example, when a similar stopper mechanism (and its rod-shaped member) is provided between the rear platen 13 and the movable platen 12, the rod-shaped member has a mold opening / closing stroke and mold thickness adjustment allowance. A length of minutes is required. This is because the distance between the rear platen 13 and the suction plate 22 does not change due to the mold thickness adjustment, whereas the distance between the rear platen 13 and the movable platen 12 changes due to the mold thickness adjustment. . Thus, by arranging the stopper mechanism 90 between the rear platen 13 and the suction plate 22 whose distance does not change by mold thickness adjustment, the length of the rod-shaped member 92 can be minimized.

  FIG. 5 is a view showing a stopper mechanism 90 ′ according to another embodiment. FIG. 6 is a cross-sectional view showing a state in which the locking member 94 is fitted in the stopper groove 93 ′.

  The stopper mechanism 90 ′ of the present embodiment is mainly different from the stopper mechanism 90 described with reference to FIGS. 3 and 4 in that the stopper groove 93 on the rearmost side is replaced with the stopper groove 93 ′. . That is, the rod-shaped member 92 ′ of the stopper mechanism 90 ′ has a plurality of stopper grooves 93 (four in this example) and stopper grooves 93 ′, and the stopper groove 93 ′ is formed on the rearmost side.

  As shown in FIGS. 5 and 6, the stopper groove 93 ′ has a cross section that rises at a right locking surface 93 a ′ at the front side of the bottom surface 93 c and rises at a right locking surface 93 b at the rear side of the bottom surface 93 c. . The stopper groove 93 ′ in the rod-shaped member 92 ′ is such that when the locking member 94 is fitted, the distance between the rear platen 13 and the suction plate 22 corresponds to the gap δ (see FIG. 1) at the time of mold clamping. Formed at various positions. That is, in the state shown in FIG. 6, the suction plate 22 cannot be moved rearward (in the mold opening direction) by the force F1 that the locking member 94 receives from the locking surface 93a ′ of the stopper groove 93 ′. In this state, the distance between the rear platen 13 and the suction plate 22 is made to correspond to the gap δ at the time of mold clamping. As a result, when the mold is exchanged (including the exchange for the purpose of mold maintenance), so-called non-feedless clamping of the mold to the fixed platen 11 and the movable platen 12 becomes possible. Specifically, the stopper mechanism 90 ′ is operated in a state where the distance between the rear platen 13 and the suction plate 22 becomes the gap δ at the time of mold clamping. As a result, as shown in FIG. 6, the suction plate 22 cannot be moved rearward (in the mold opening direction) by the force F1 received by the locking member 94 from the locking surface 93a ′ of the stopper groove 93 ′. Therefore, in this state, the gap δ is always maintained during the mold replacement without requiring the electromagnet 49 to be driven, and the mold replacement work can be performed efficiently. For example, a desired mold clamping force can be generated by advancing the movable platen 12 by the mold thickness adjusting mechanism 44 with the locking member 94 fitted in the stopper groove 93 ′. As a result, the main clamping operation of the mold apparatus 19 can be performed in a state where a desired mold clamping force is maintained between the fixed platen 11 and the movable platen 12.

  In the embodiment described above, the “first fixed member” in the claims corresponds to the fixed platen 11, and the “first movable member” in the claims corresponds to the movable platen 12. . The “second fixing member” in the claims corresponds to the rear platen 13, and the “second movable member” in the claims corresponds to the suction plate 22. Further, the “first groove” in the claims corresponds to the stopper groove 93, and the “second groove” in the claims corresponds to the stopper groove 93 ′.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, in the above-described embodiment, the inclined surface 93a is formed in the stopper groove 93, and only the movement of the rear platen 13 in the mold closing direction is locked, and the locking member 94 is smoothly fitted into the stopper groove 93. Although realized, a similar inclined surface can be formed at the end of the locking member 94 to obtain the same effect.

  In the embodiment described above, the locking member 94 is provided on the rear platen 13, but it may be provided on another fixing member such as the frame Fr. For example, the locking member 94 may be configured to move upward from the frame Fr to the engagement position. In this case, the stopper groove 93 (the same applies to the stopper groove 93 ′) may be formed on the lower surface side of the bar-shaped member 92 (the same applies to the bar-shaped member 92 ′).

  In the above-described embodiment, the rod-shaped member 92 is fixed to the suction plate 22 side and the locking member 94 is provided to the rear platen 13 side. However, the reverse configuration is also possible. That is, the rod-shaped member 92 may be fixed to the rear platen 13 (or another fixing member such as the frame Fr), and the locking member 94 may be provided on the suction plate 22. In the latter case, the rod-shaped member 92 may be configured integrally with the frame Fr.

  Further, in the above description, the mold clamping device 10 having a specific configuration is illustrated, but the mold clamping device 10 may have any configuration that performs mold clamping using an electromagnet.

Fr frame Gd guide 10 mold clamping device 11 fixed platen 12 movable platen 13 rear platen 14 tie bar 15 fixed mold 16 movable mold 17 injection device 18 injection nozzle 19 mold device 22 suction plate 28 linear motor 29 stator 31 mover 33 magnetic pole Teeth 34 Core 35 Coil 37 Electromagnet unit 39 Center rod 41 Hole 44 Mold thickness adjusting mechanism 45 Groove 46 Core 47 Yoke 48 Coil 49 Electromagnet 51 Adsorption part 55 Load detector 60 Control part 61 Mold opening / closing process part 62 Mold clamping process part 90, 90 'stopper mechanism 92, 92' rod-like member 93, 93 'stopper groove 93a inclined surface 93a' locking surface 93b locking surface 94 locking member

Claims (4)

A first fixing member to which a fixed mold is attached;
A second fixing member disposed opposite to the first fixing member;
A first movable member to which a movable mold is attached;
A second movable member that is connected to the first movable member and moves together with the first movable member, and generates a mold clamping force by an attractive force of an electromagnet in cooperation with the second fixed member. A second movable member constituting a mold clamping force generating mechanism to be caused;
One end is provided between the second movable member and the second fixed member, one end of the second movable member and the second fixed member is fixed to the second movable member, and the second fixed member. A rod-like member whose other end extends to the other of the movable member and the second fixed member,
A locking member that is movable between an engagement position that engages with the rod-shaped member and a disengagement position that separates from the rod-shaped member, and the second movable member is moved when in the engagement position. An injection molding machine comprising: a locking member for preventing.   The injection molding machine according to claim 1, wherein the rod-shaped member is formed with a plurality of grooves into which the locking members at the engagement positions are fitted.   The plurality of grooves, when the locking member is fitted, a first groove that functions to lock the movement of the second movable member in the mold closing direction, and when the locking member is fitted, The injection molding machine according to claim 2, further comprising: a second groove that functions to lock movement of the second movable member in the mold opening direction.   In the second groove in the rod-shaped member, when the locking member is fitted, the distance between the second movable member and the second fixed member is a distance corresponding to the gap at the time of mold clamping. The injection molding machine according to claim 3, wherein the injection molding machine is formed at such a position.

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