Molding device

Abstract

To provide a mold clamping device capable of maintaining good balance of a tie bar axis.SOLUTION: A mold clamping device 31 has: a fixed platen 32a on which a fixed mold 102 is fixed; a movable platen 32b to which a movable mold 103 is fixed; a toggle mechanism 37 that moves the movable platen 32b forward and backward; and a toggle support 34 that supports the toggle mechanism 37 and is connected to the fixed platen 32a via a tie bar 32c. The toggle support 34 has: a tie bar connection 34a to which the tie bar 32c is connected; a link connection 34b to which the toggle mechanism 37 is connected; and a restraining part 34c that is located between the tie bar connection 34a and the link connection 34b to restrain transmission of inclination of one connection 34a, 34b to the other connection 34a, 34b.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a mold clamping device, and more particularly to a toggle-type mold clamping device. [Background technology]

[0002] A clamping device of a mold apparatus having a fixed mold and a movable mold is known. Patent Document 1 describes an example of a mold clamping mechanism in which tie bars are placed on the top, bottom, left and right between a fixed platen fixed to a bed and a pressure-receiving platen, a movable platen is movably attached to these tie bars, and the mold is clamped by the movable platen and the fixed platen.

[0003] Patent Document 2 describes an example of a toggle-link type clamping device that includes a platen base portion having tie bar insertion holes at the four corners, and a platen upper wall portion and a platen lower wall portion, in which the platen upper wall portion and the platen lower wall portion have a predetermined space portion for suppressing deformation in the vertical direction.

[0004] Patent Document 3 describes an example of an injection molding machine with a toggle support. The injection molding machine has a toggle support having a toggle support main body including a load receiving portion at a corner that receives a load from a tie bar, and a link pin attachment portion to which a link pin of a toggle mechanism is attached, and a recess is provided between the load receiving portions provided on both sides of the link pin attachment portion and the link pin attachment portion and the load receiving portion. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2016-34752 A [Patent Document 2] JP 2012-166423 A [Patent Document 3] International Publication No. 2017 / 164422 Summary of the Invention [Problem to be solved by the invention]

[0006] Toggle-type clamping devices as described in Patent Documents 1 to 3 open and close a mold using the clamping force generated when a toggle mechanism expands and contracts. Therefore, when joint parts of the toggle mechanism, such as a toggle pin, a pin hole, or a bush, wear out, the platen supporting the toggle mechanism may tilt, causing the axis of the tie bar connected to the tilted platen to become unbalanced. When the axis of the tie bar becomes unbalanced, an excessive moment is applied to the screw shaft for moving the toggle mechanism forward and backward, shortening the life of the screw shaft or causing problems such as deterioration in the parallelism of the platen connected to the mold via the tie bar.

[0007] In view of the above problems, the present invention provides a mold clamping device capable of maintaining good balance of the axes of the tie bars. [Means for solving the problem]

[0008] In order to solve the above problems, according to an embodiment of the present invention, a clamping device is provided that includes a fixed platen to which a fixed mold is fixed, a movable platen to which a movable mold is fixed, a toggle mechanism that moves the movable platen back and forth, and a toggle support that supports the toggle mechanism and is connected to the fixed platen via a tie bar, and the toggle support includes a tie bar connection portion to which the tie bar is connected, a link connection portion to which the toggle mechanism is connected, and a suppression portion that is disposed between the tie bar connection portion and the link connection portion and suppresses the transmission of a tilt of one connection portion to the other connection portion. Effect of the Invention

[0009] According to the present invention, it is possible to provide a mold clamping device capable of maintaining good balance of the tie bar axes. [Brief description of the drawings]

[0010] [Figure 1] 1 is a partial cross-sectional view showing an example of an injection molding machine that can be used for a mold clamping device according to an embodiment of the present invention. [Diagram 2] 1 is a partial cross-sectional view showing a mold clamping device according to a first embodiment. [Diagram 3] 1 is a partial cross-sectional view showing a mold clamping device according to a first embodiment. [Figure 4] 4 is a partial cross-sectional view showing the mold clamping device as viewed from a cross section taken along line IV-IV in FIG. 3. [Diagram 5] 4 is a partial cross-sectional view showing the mold clamping device as seen from a cross section taken along line VV in FIG. 3. [Figure 6] FIG. 11 is a partial cross-sectional view of a mold clamping device according to a second embodiment, showing the mold clamping device as viewed from the operation direction (side surface side). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are given the same or similar reference numerals. The embodiments shown below are examples of devices and methods for embodying the technical idea of ​​this invention, and the technical idea of ​​this invention does not limit the structure, arrangement, etc. of each component to those described below.

[0012] (injection molding machine) A mold clamping device 31 according to an embodiment of the present invention can be applied to, for example, an injection molding machine 1 as shown in Fig. 1. The injection molding machine 1 includes an injection device 11 that melts molding material inside a cylinder 12 and injects it into a mold device 101, a movement device 21 that moves the injection device 11 forward and backward relative to the mold device 101, a mold clamping device 31 that opens and closes the mold device 101 between a mold clamped state and a mold open state, and an ejector device 41 that pushes out and ejects a molded product from the mold device 101 in the mold open state.

[0013] In the following description, the direction approaching the fixed platen 32a of the mold clamping unit 31 to which the fixed mold 102 of the mold device 101 is attached is the front side, and the direction moving away from the fixed platen 32a is the rear side. Therefore, for the injection unit 11 located to the right of the fixed platen 32a in Fig. 1, the left direction approaching the fixed platen 32a is the front side, and the right direction moving away from the fixed platen 32a is the rear side. On the other hand, for the ejector unit 41 and the mold clamping unit 31 located to the left of the fixed platen 32a in the paper, the right direction approaching the fixed platen 32a is the front side, and the left direction moving away from the fixed platen 32a is the rear side.

[0014] The mold assembly 101 includes, for example, a fixed mold 102 in which a cavity is defined in the clamped state, a movable mold 103 facing the fixed mold 102, and a movable member 104 such as an ejector pin that is displaced by an ejector device 41 to push out a molded product. The mold assembly 101 in Fig. 1 can be called a two-plate mold divided into two, the fixed mold 102 and the movable mold 103, but it can also be a three-plate mold divided into three by having a slide mold, a slide core, or a stripper plate. The mold assembly 101 can be attached to the injection molding machine 1 and replaced as appropriate depending on the shape of the molded product to be manufactured.

[0015] The injection device 11 includes a cylinder 12 having a cylindrical shape or the like extending toward the mold device 101, a screw 13 arranged inside the cylinder 12 with its central axis parallel to the cylinder 12 and having flights spirally arranged around its periphery, a heater 14 having a band shape or the like arranged on the outer periphery of the cylinder 12 surrounding it, and a motor box 15 arranged behind the cylinder 12 and the screw 13.

[0016] The cylinder 12 is provided with a supply port 12a near the motor box 15 to which a hopper for feeding the molding material into the cylinder 12 can be attached. A nozzle 12b having a smaller cross-sectional area at the front side is provided at the tip of the cylinder 12. The molding material fed into the cylinder 12 from the supply port 12a is melted based on the rotation of the screw 13 driven by the metering motor under heating by the heater 14 on the outer periphery side of the cylinder 12, and is sent toward the mold device 101 inside the cylinder 12 to fill the tip of the cylinder 12. At this time, the screw 13 is displaced backward by the injection motor to form a space at the tip of the cylinder 12 where the molding material is filled. A cooler 12c using water cooling or the like can be provided near the supply port 12a.

[0017] The moving device 21 is provided below the motor box 15 of the injection device 11, and moves the injection device 11 forward and backward relative to the fixed platen 32a to which the fixed mold 102 is fixed. Various mechanisms can be adopted as the forward and backward drive mechanism constituting the moving device 21. The moving device 21 shown in the figure is configured to include a hydraulic or other hydraulic pump 22, an electric or other pump operating motor 23 that operates the hydraulic pump 22, and a double-acting hydraulic cylinder 24 that receives hydraulic fluid from the hydraulic pump 22 and performs an extrusion and retraction movement of a piston rod, the tip of which is fixed to the fixed platen 32a.

[0018] The moving device 21 further includes a slide base 25 to which the above-mentioned hydraulic pump 22, pump actuation motor 23, and hydraulic cylinder 24 are attached, and a linear guide 26 that is laid on the frame Fr and guides the linear motion of the slide base 25. Thereby, forward and backward displacement of the injection device 11 placed on the upper part of the slide base 25 is realized.

[0019] The ejector unit 41 has an ejector rod 42 that extends through the movable platen 32b and is driven to advance and retreat so as to press a movable member 104, such as an ejector pin, of the mold unit 101 from the rear side, and a rod drive source 43 including a motion conversion mechanism, such as a motor and a ball screw, for operating the ejector rod 42. The ejector unit 41 makes it possible to advance the ejector rod 42 driven by the rod drive source 43, to eject the movable member 104 within the mold unit 101, and to push out the molded product from the mold unit 101. After the movable member 104 has been ejected, the ejector rod 42 can be retreated by the rod drive source 43 to return it to its original position.

[0020] The mold clamping device 31 is a device for displacing the movable mold 103 relative to the fixed mold 102 of the mold device 101 to open and close the mold device 101 and set the mold device 101 in a mold clamped state, mold closed state, or mold open state. The mold clamping device 31 includes a fixed platen 32a to which the fixed mold 102 is fixed, a movable platen 32b to which the movable mold 103 is fixed, and a platen operating mechanism 33 for operating the movable platen 32b relative to the fixed platen 32a.

[0021] At a position where the movable platen 32b is separated from the fixed platen 32a, the movable mold 103 of the mold device 101 is in a mold open state in which it is open from the fixed mold 102. By moving the movable platen 32b toward the fixed platen 32a from this separated position, the movable mold 103 is in a mold closed state in which it is closed against the fixed mold 102. When the movable platen 32b is further moved toward the fixed platen 32a, the movable mold 103 is pressed against the fixed mold 102 in a mold clamped state.

[0022] The platen operating mechanism 33 is placed on the frame Fr and includes a toggle support 34 positioned at a distance from the fixed platen 32a, a clamping motor 35, a motion conversion mechanism 36 that converts the rotational motion of the clamping motor 35 into linear motion, and a toggle mechanism 37 that amplifies the force transmitted to the motion conversion mechanism 36 and transmits it to the movable platen 32b.

[0023] In the mold clamping device 31 according to the embodiment of the present invention, when the mold device 101 is opened, the multiple links 37a-37c and 37e-37g constituting the toggle mechanism 37 are bent in a direction toward the radial inside of the shaft portion 36a of the motion converting mechanism 36, that is, toward the center of the machine, which is called an "inward-winding toggle mechanism." Conversely to the inward-winding toggle mechanism, when the mold device 101 is opened, the links 37a-37c and 37e-37g are bent in a direction away from the center of the machine, which is called an "outward-winding toggle mechanism."

[0024] (First embodiment) 2, the mold clamping device 31 according to the first embodiment is an example of a mold clamping device 31 equipped with a toggle mechanism 37 having an inward-rolling toggle mechanism. The mold clamping device 31 is equipped with a fixed platen 32a to which a fixed mold 102 is fixed, a movable platen 32b to which a movable mold 103 is fixed, a toggle mechanism 37 that moves the movable platen 32b forward and backward, and a toggle support 34 that supports the toggle mechanism 37 and is connected to the fixed platen 32a via a tie bar 32c.

[0025] One end of each of a plurality of tie bars 32c is attached to the fixed platen 32a. Typically, four tie bars 32c extending parallel to each other are formed on the surface of the fixed platen 32a facing the mold device 101. The four tie bars 32c are attached at equal intervals. The other end of each of the tie bars 32c is attached to a toggle support 34 that faces the fixed platen 32a with a gap therebetween, sandwiching the mold device 101 and the toggle mechanism 37 therebetween, as shown in FIG. 1.

[0026] The toggle support 34 includes a tie bar connection portion 34a, a link connection portion 34b, and a suppression portion 34c. The tie bar connection portion 34a is placed on the frame Fr. The tie bars 32c are supported by the tie bar connection portion 34a and the fixed platen 32a so that the axial directions of the tie bars 32c are substantially parallel to each other. The tie bar connection portion 34a has a front surface 341a facing the link connection portion 34b and a rear surface 342a which is the surface opposite to the front surface 341a. The rear surface 342a of the tie bar connection portion 34a may be provided with a reinforcing portion (not shown) that reinforces the tie bar connection portion 34a in order to suppress deformation of the tie bar connection portion 34a when the mold device 101 is clamped.

[0027] The link connection portion 34b is disposed between the movable platen 32b and the tie bar connection portion 34a and spaced apart from the tie bar connection portion 34a. The link connection portion 34b has a front surface 341b to which the toggle mechanism 37 is connected and a rear surface 342b facing the tie bar connection portion 34a. The toggle mechanism 37 has a pair of ground side link groups 37A provided below the front surface 341b of the link connection portion 34b, a pair of top side link groups 37B provided above the front surface 341b of the link connection portion 34b, and a crosshead 37d connecting the ground side link group 37A and the top side link group 37B to each other.

[0028] The bottom link group 37A includes a link 37a connected to the link connection part 34b via an arm 42A protruding from the front surface 341b of the link connection part 34b, a link 37c having one end connected to the link 37a and the other end connected to the lower part of the movable platen 32b, and a link 37b connected between the link 37a and the crosshead 37d. The top link group 37B includes a link 37e connected to the link connection part 34b via an arm 42B protruding from the front surface 341b of the link connection part 34b, a link 37g having one end connected to the link 37e and the other end connected to the upper part of the movable platen 32b, and a link 37f connected between the link 37e and the crosshead 37d. The links 37a to 37c and 37e to 37g are connected to each other between the link connection part 34b and the fixed platen 32a by joint members 371 such as pins, pin holes, and bushes so as to be able to swing with each other. The number, positions and shapes of the links 37a to 37c, 37e to 37g and the joint member 371 can be changed as appropriate.

[0029] A through hole 121 penetrating the front surface 341b and the rear surface 342b is provided in the center 343b of the link connection part 34b, and the motion conversion mechanism 36 is disposed in the through hole. For the motion conversion mechanism 36, various mechanisms are used that can convert the rotational motion of the mold clamping motor 35 into linear motion along the axial direction of a shaft part 36a provided in the motion conversion mechanism 36. Here, the motion conversion mechanism 36 includes a shaft part (screw shaft) 36a that is rotationally driven by the mold clamping motor 35, and a nut 36b that screws onto the shaft part 36a. For the motion conversion mechanism 36, a ball screw may also be used.

[0030] FIG. 3 is a partial cross-sectional view showing the periphery of the tie bar connection portion 34a and the link connection portion 34b as viewed from a cross section different from that of FIG. 2. The ground side link group 37A is connected to an arm portion 42A extending forward from the link connection portion 34b. The top side link group 37B is connected to an arm portion 42B extending forward from the link connection portion 34b. As shown in FIG. 5, the arm portion 42A is provided so as to protrude forward from a front surface 341b of the link connection portion 34b at multiple points with a gap therebetween. Then, the link 37a of the ground side link group 37A is disposed between the adjacent arm portions 42A and 42A, and the arm portion 42A and the link 37a are connected to each other using a joint member such as a pin. Similarly, the arm portion 42B is provided so as to protrude forward from a front surface 341b of the link connection portion 34b at multiple points with a gap therebetween. Link 37e of top link group 37B is disposed between adjacent arm portions 42B and 42B, and the links are connected to each other by a joint member.

[0031] In the example of Fig. 3, since an inward-rolling toggle mechanism is shown, when the crosshead 37d is moved backward along the shaft 36a during mold opening, the links 37b and 37f connected to the crosshead 37d move backward toward the link connection part 34b side. As a result, the links 37a and 37e are displaced toward the center of the machine, so that the bottom link group 37A and the top link group 37B are bent toward the center of the machine. The links 37c and 37f connected to the links 37a and 37e are similarly displaced toward the center of the machine as the links 37a and 37e move toward the center of the machine.

[0032] One end of the shaft portion 36a of the motion conversion mechanism 36 is supported by the link connection portion 34b, and the tip portion of the shaft portion 36a is not supported. A crosshead guide 39 for guiding the crosshead 37d in the axial direction of the shaft portion 36a is provided around the shaft portion 36a of the motion conversion mechanism 36. One end of the crosshead guide 39 is fixed to the link connection portion 34b. The crosshead 37d is connected so as to be slidable along the crosshead guide 39. The crosshead guides 39 extend parallel to each other along the axial direction of the shaft portion 36a from the front surface 341b of the link connection portion 34b. As shown in FIG. 5, the crosshead guides 39 are arranged to surround the periphery of the shaft portion 36a. The crosshead guides 39 are attached at equal distances from the center P4 of the through hole 121 for accommodating the shaft portion 36a of the motion conversion mechanism 36, and four crosshead guides 39 are attached at intervals on the top, bottom, left and right.

[0033] As shown in Fig. 3, the mold clamping motor 35 is connected to and fixed to the link connection part 34b. In this way, the crosshead guide 39, the mold clamping motor 35, the motion conversion mechanism 36, and the crosshead 37d are connected to the link connection part 34b, and are not fixed to the tie bar connection part 34a. Therefore, as shown in Fig. 2, even if the upper part of the link connection part 34b is tilted toward the movable platen 32b by an inclination θ due to minute wear (Δr) of the joint member 371 caused by long-term use, the relative positions of the mold clamping motor 35, the shaft part 36a, the crosshead 37d, and the crosshead guide 39 connected to the link connection part 34b and the link connection part 34b are maintained constant.

[0034] According to the mold clamping device 31 of the first embodiment, the mold clamping motor 35, the shaft portion 36a, the crosshead 37d, and the crosshead guide 39 are all connected to the link connection portion 34b. Therefore, even if wear Δr occurs in the joint member 371 connecting the top link group 37B and the link connection portion 34b is tilted by an angle θ due to this wear Δr, the tilt of the shaft portion 36a is always constant with respect to the link connection portion 34b, so that the load on the shaft portion 36a of the motion conversion mechanism 36 can be reduced and the life of the shaft portion 36a can be extended.

[0035] The suppression portion 34c is disposed between a front surface 341a of the tie bar connection portion 34a and a rear surface 342b of the link connection portion 34b. As shown in FIG. 4, the tie bar connection portion 34a has a through hole 120 into which the mold clamping motor 35 is inserted with a gap d on its inner circumference. The suppression portions 34c are disposed so that their centers P2 are approximately aligned with a height (y / 2) that is exactly midway between the centers P3 of the upper and lower tie bars 32c, and are provided opposite each other across the through hole 120. The suppression portions 34c are disposed so that their centers P2 are spaced apart from the center P1 of the through hole 120 by an equal distance (x / 2). The upper and lower tie bars 32c connected to the tie bar connection portion 34a are disposed so that they are each spaced the same distance from the center P1 of the through hole 120 of the tie bar connection portion 34a. These two suppressing portions 34c balance the forces of the tie bar connection portion 34a and the link connection portion 34b at the intermediate portions of the front surface 341a and the rear surface 342b. For example, if the force applied from the link connection portion 34b is a compressive force F, the compressive force F is concentrated at the intermediate portion of the tie bar connection portion 34a and transmitted to the tie bar connection portion 34a, and is configured to be balanced by the same tensile force (F / 2) by the upper and lower tie bars 32c located at the same position from the intermediate portion.

[0036] 2, when a displacement occurs due to minute wear (Δr) in the joint member 371 and the link connection part 34b tilts forward from the vertical direction at an angle θ, the suppression part 34c elastically deforms and bends. As a result, the suppression part 34c can suppress the transmission of the tilt of one link connection part 34b to the other tie bar connection part 34a. The material of the suppression part 34c is not limited to the following, but it is preferable that the suppression part 34c is made of, for example, chrome molybdenum steel or the like.

[0037] The shape of the suppression part 34c is not particularly limited. For example, the suppression part 34c may include a first load receiving part 341 having a surface that receives a load from the link connection part 34b, a second load receiving part 342 having a surface that receives a load from the tie bar connection part 34a, and a recessed part 343 provided between the first load receiving part 341 and the second load receiving part 342 and having recesses formed at the top and bottom for releasing deformation of the first load receiving part 341 or the second load receiving part 342. By providing the recessed part 343 in the suppression part 34c, elastic deformation of the suppression part 34c is more likely to occur, and the inclination of the link connection part 34b due to wear (Δr) of the joint member 371 can be made less likely to be transmitted to the tie bar connection part 34a.

[0038] According to the mold clamping device 31 of the first embodiment, by providing the toggle support 34 including the tie bar connection portion 34a, the link connection portion 34b, and the suppression portion 34c, even if the link connection portion 34b is tilted by the inclination θ due to wear (Δr) of the joint member 371 of the toggle mechanism 37, the suppression portion 34c is elastically deformed, and the forces are balanced between the front surface 341a of the tie bar connection portion 34a and the rear surface 342b of the link connection portion 34b. As a result, even if the link connection portion 34b is tilted by the inclination θ, the tie bar connection portion 34a supporting the tie bar 32c is not tilted. Since the tie bar connection portion 34a is not tilted together with the link connection portion 34b, the tie bar connection portion 34a can more appropriately support the tie bar 32c, and the balance in the vertical direction of the axis of the tie bar 32c is less likely to be lost. Therefore, according to the mold clamping device 31 of the first embodiment, it is possible to stably and satisfactorily maintain the balance of the axis of the tie bar 32c even if a small change occurs due to wear (Δr) in the joint member 371 of the toggle mechanism 37. Since the loss of balance of the axis of the tie bar 32c is suppressed, the surface pressure distribution of the mold device 101 is also uniform.

[0039] (Second embodiment) As shown in FIG. 6, the mold clamping device 31 according to the second embodiment is an example of a mold clamping device 31 having an outward winding toggle mechanism. The toggle support 34 includes a tie bar connection portion 34a, a link connection portion 34b, and a suppression portion 34c. The tie bar 32c is connected to the tie bar connection portion 34a. The tie bar 32c is supported between the tie bar connection portion 34a and the fixed platen 32a such that the axial directions of the multiple tie bars 32c are substantially parallel to each other and the axis balance is maintained. The link connection portion 34b is connected to the tie bar connection portion 34a via the elastically deformable suppression portion 34c, and the forces are balanced by the elastic deformation of the suppression portion 34c.

[0040] A pair of bottom link groups 37A including links 37a, 37b, and 37c, and a pair of top link groups 37B including links 37e, 37f, and 37g are connected to the link connection portion 34b. The bottom link group 37A and the top link group 37B are connected to a crosshead 37d. Although not shown, the crosshead 37d is connected to the shaft portion of the motion conversion mechanism via a nut connected thereto so as to be movable forward and backward in the axial direction of the shaft portion. The crosshead guide 39 extends from the link connection portion 34b along the axial direction of the shaft portion of the motion conversion mechanism, and is fixed to the upper and lower parts of the link connection portion 34b. The crosshead guide 39 is connected to the crosshead 37d, and extends slidably along the axial direction of the shaft portion of the motion conversion mechanism. The tie bar connection portion 34a includes a through hole 120 capable of accommodating the clamping motor 35 connected to the link connection portion 34b, and the suppression portion 34c is disposed at a height intermediate between the upper and lower tie bars 32c. The suppression portion 34c is elastically deformably disposed between the tie bar connection portion 34a and the link connection portion 34b so as to suppress the transmission of the inclination of one of the connection portions, the tie bar connection portion 34a or the link connection portion 34b, to the other connection portion.

[0041] Even in the mold clamping device 31 equipped with a toggle mechanism having an external winding toggle mechanism, the length of the upper and lower link groups changes due to a small displacement caused by wear of the joint members connecting the links of the toggle mechanism, and the toggle support 34 connected to the link groups may tilt forward by an inclination θ. In the mold clamping device 31 according to the second embodiment, by providing the toggle support 34 equipped with the tie bar connection portion 34a, the link connection portion 34b, and the suppression portion 34c, even if the link connection portion 34b tilts by an inclination θ due to wear of the joint members of the toggle mechanism 37, the suppression portion 34c elastically deforms so that the forces between the tie bar connection portion 34a and the link connection portion 34b are balanced. At this time, even if the link connection portion 34b tilts by an inclination θ and the axial direction of the shaft portion (not shown) tilts from direction A to direction B, the tie bar connection portion 34a supporting the tie bar 32c does not tilt. Therefore, according to the mold clamping unit 31 according to the second embodiment, the tie bar connection portion 34a can appropriately support the tie bar 32c between itself and the fixed platen 32a, so that the axis of the tie bar 32c is less likely to become unbalanced.

[0042] Furthermore, according to the mold clamping unit 31 of the second embodiment, the size of the link connection portion 34b can be made smaller than that of the mold clamping unit 31 including the toggle mechanism 37 having the inward-winding toggle mechanism of the first embodiment. This allows the mold clamping unit 31 to be made lighter and smaller.

[0043] Although the present invention has been described by the above embodiment, the description and drawings forming a part of this disclosure should not be understood as limiting the present invention. In other words, the present disclosure is not limited to the above embodiment, and the components can be combined and modified to be embodied without departing from the spirit of the present disclosure. [Explanation of symbols]

[0044] 1…Injection molding machine 11...Injection device 21...Moving device 31…Mold clamping device 32a…Fixed platen 32b... Movable platen 32c…Tie bar 33...Platen operating mechanism 34…Toggle support 34a…Tie bar connection 34b…Link connection part 34c...Suppression part 35...Mold clamping motor 36...Movement conversion mechanism 36a...Shaft part 36b...Nut 37…Toggle mechanism 37a-37c, 37e-37g... Link 37d…Crosshead 37A…Ground link group 37B…Top links 39…Crosshead guide 41...Ejector device 101...Molding equipment 102…Fixed mold 103... Movable mold 104... Movable member 341...First load receiving portion 342...Second load receiving part 343…Recess 371...Joint material

Claims

1. a fixed platen on which a fixed mold is fixed; a movable platen to which the movable mold is fixed; A toggle mechanism that moves the movable platen forward and backward; a toggle support that supports the toggle mechanism and is connected to the fixed platen via a tie bar; The toggle support is a tie bar connection portion to which the tie bar is connected; a link connection portion to which the toggle mechanism is connected; a suppression portion disposed between the tie bar connection portion and the link connection portion and suppressing transmission of a tilt of one connection portion to the other connection portion; Equipped with The toggle mechanism comprises: a plurality of link groups each including a plurality of links disposed between the movable platen and the link connection portion; a crosshead connected to the plurality of link groups, A mold clamping device in which the crosshead is connected to a shaft portion of a motion conversion mechanism that moves the crosshead along an axial direction, and the shaft portion is fixed to the link connection portion.

2. The mold clamping device according to claim 1 , further comprising a mold clamping motor connected to the link connection portion.

3. The mold clamping device according to claim 1 or 2, further comprising a crosshead guide extending from the link connection portion along the axial direction of the shaft portion, connected to the crosshead, and guiding the crosshead along the axial direction.

4. The mold clamping device according to any one of claims 1 to 3, wherein the toggle mechanism has an inward-rolling toggle mechanism.

5. The mold clamping device according to any one of claims 1 to 3, wherein the toggle mechanism has an external winding type toggle mechanism.

6. A stationary platen to which a stationary mold is fixed; a movable platen to which the movable mold is fixed; A toggle mechanism that moves the movable platen forward and backward; a toggle support that supports the toggle mechanism and is connected to the fixed platen via a tie bar; The toggle support is a tie bar connection portion to which the tie bar is connected; a link connection portion to which the toggle mechanism is connected; a suppression portion disposed between the tie bar connection portion and the link connection portion and suppressing transmission of a tilt of one connection portion to the other connection portion; Equipped with A clamping device in which the tie bar connection portion has a through hole capable of accommodating a clamping motor connected to the link connection portion, and the suppression portions are arranged opposite each other across the through hole at a height that is midway between the upper and lower tie bars.

7. A stationary platen to which a stationary mold is fixed; a movable platen to which the movable mold is fixed; A toggle mechanism that moves the movable platen forward and backward; a toggle support that supports the toggle mechanism and is connected to the fixed platen via a tie bar; The toggle support is a tie bar connection portion to which the tie bar is connected; a link connection portion to which the toggle mechanism is connected; a suppression portion disposed between the tie bar connection portion and the link connection portion and suppressing transmission of a tilt of one connection portion to the other connection portion; Equipped with The suppression portion is a first load receiving portion that receives a load from the link connection portion; A second load receiving portion that receives a load from the tie bar connection portion; a recessed portion provided between the first load receiving portion and the second load receiving portion, the recessed portion having a recess for releasing deformation of the first load receiving portion or the second load receiving portion; A mold clamping device comprising:

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