mold clamping device

Abstract

Provided is a mold clamping device capable of suppressing inclination of a platen. A mold clamping device (10) according to an embodiment includes a support member (24) provided on a base (14) to support a movable platen (22). The support member (24) includes a support column portion (34) extending toward a side away from the base (14), and a link portion (36) extending from the support column portion (34) toward a fixed platen (16) side along an extension direction of a link rod (20) and linked to the movable platen (22).

Description

Technical Field

[0001] This invention relates to a mold closing device for an injection molding machine. Background Technology

[0002] An injection molding machine includes a mold clamping device for opening and closing a metal mold and an injection device for injecting resin into the metal mold. Japanese Patent Application Publication No. 2014-40087 discloses a mold clamping device comprising: a fixed pressure plate and a rear pressure plate separately disposed on a base; and a movable pressure plate configured to move along a plurality of connecting rods connecting the fixed pressure plate and the rear pressure plate. In Japanese Patent Application Publication No. 2014-40087, the fixed pressure plate and the movable pressure plate are arranged parallel to each other. Summary of the Invention

[0003] However, due to requirements such as improving the transferability of metal molds, the temperature of the metal mold is sometimes set higher than normal. In this case, the heat generated in the metal mold is transferred to the connecting rod, causing the connecting rod to expand thermally. This raises concerns that at least one of the fixed and movable pressure plates may tilt, disrupting their parallelism.

[0004] In mold clamping devices, due to heat generated in the metal mold escaping to the base through the fixed and movable pressure plates, the side opposite to the base tends to become hotter than the base side. Therefore, in the case of Japanese Patent Application Publication No. 2014-40087, the thermal expansion of the connecting rod farther from the base tends to be greater than that of the connecting rod closer to the base. Consequently, in Japanese Patent Application Publication No. 2014-40087, at least one of the fixed and movable pressure plates becomes prone to tilting, resulting in a greater distance between the fixed and movable pressure plates the further away from the base.

[0005] Therefore, the present invention provides a mold closing device capable of suppressing the tilting of the pressure plate.

[0006] The first aspect of the present invention is a mold clamping device for an injection molding machine, which includes:

[0007] Base;

[0008] A fixed pressure plate is fixed to the base;

[0009] A rear pressure plate, which is separately disposed on the base from the fixed pressure plate;

[0010] Multiple connecting rods connecting the fixed pressure plate to the rear pressure plate;

[0011] A movable pressure plate, through which the connecting rod passes, is configured to move along the extending direction of the passing connecting rod.

[0012] The mold clamping device includes a support component disposed on the base for supporting the movable pressure plate.

[0013] The support component includes:

[0014] A support portion extending toward a side away from the base; and

[0015] A connecting portion extends from the support portion along the extending direction toward the fixed pressure plate side and is connected to the movable pressure plate.

[0016] The second aspect of the present invention is a mold clamping device for an injection molding machine, which includes:

[0017] Base;

[0018] A fixed pressure plate is fixed to the base;

[0019] A rear pressure plate, which is separately disposed on the base from the fixed pressure plate;

[0020] Multiple connecting rods connecting the fixed pressure plate to the rear pressure plate;

[0021] A movable pressure plate, through which the connecting rod passes, is configured to move along the extending direction of the passing connecting rod.

[0022] The mold clamping device includes a support component disposed on the base to support the fixed pressure plate.

[0023] The support component includes:

[0024] The support portion extends toward the side away from the base;

[0025] A connecting portion extends from the support portion along the extending direction toward the movable pressure plate side and is connected to the fixed pressure plate.

[0026] According to the method of the present invention, the tilting of the pressure plate can be suppressed.

[0027] That is, in the first embodiment, when the connecting rod undergoes thermal expansion, a force acts on the movable pressure plate towards the rear pressure plate side; conversely, when the connecting part undergoes thermal expansion, a force acts on the movable pressure plate towards the fixed pressure plate side. On the other hand, in the second embodiment, when the connecting rod undergoes thermal expansion, a force acts on the fixed pressure plate towards the side opposite to the movable pressure plate side; conversely, when the connecting part undergoes thermal expansion, a force acts on the fixed pressure plate towards the movable pressure plate side.

[0028] That is, in either the first or the second method, the force acting on the pressure plate due to the thermal expansion of the connecting part can be used to counteract the force acting on the pressure plate due to the thermal expansion of the connecting rod. Therefore, it is possible to suppress the situation where the parallelism between the fixed pressure plate and the movable pressure plate is disrupted due to the tilting of the fixed pressure plate or the movable pressure plate.

[0029] This helps to prevent the pressure plate from tilting. Attached Figure Description

[0030] Figure 1 This is a schematic diagram showing the mold clamping device of the first embodiment.

[0031] Figure 2 Indicates inclusion Figure 1 The periphery of the movable pressure plate.

[0032] Figure 3 This is a conceptual diagram illustrating the state of the forces generated in the mold clamping device of the first embodiment.

[0033] Figure 4 This is a schematic diagram showing the mold clamping device according to the second embodiment.

[0034] Figure 5 Indicates inclusion Figure 4 The periphery of the fixed pressure plate.

[0035] Figure 6 This is a conceptual diagram illustrating the state of the forces generated in the mold clamping device of the second embodiment. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the accompanying drawings, following preferred embodiments.

[0037] [First Implementation Method]

[0038] Figure 1 This is a schematic diagram showing the mold clamping device 10 according to the first embodiment. Figure 1 The diagram shows the first orthogonal direction D1, the second direction D2, and the third orthogonal direction D3.

[0039] The mold closing device 10 opens and closes the metal mold 12, which consists of a fixed mold 12A and a moving mold 12B. The mold closing device 10 has a base 14, a fixed pressure plate 16, a rear pressure plate 18, multiple connecting rods 20, a movable pressure plate 22, and a support component 24.

[0040] The base 14 is a platform for mounting the mold clamping device 10. The length direction of the base 14 is aligned with the first direction D1. The width direction of the base 14 is aligned with the second direction D2. The height direction of the base 14 is aligned with the third direction D3. The mounting surface 14F of the base 14 for mounting the mold clamping device 10 can be arranged horizontally or in a direction other than horizontal. In this embodiment, the mounting surface 14F of the base 14 is arranged horizontally. Furthermore, in this embodiment, the direction orthogonal to the mounting surface 14F that moves away from the mounting surface 14F towards the mold clamping device 10 is defined as the upward direction, and the direction opposite to the upward direction that moves away from the mounting surface 14F towards the base 14 is defined as the downward direction.

[0041] A fixed pressure plate 16 is fixed to a base 14. The fixed pressure plate 16 extends upward from the mounting surface 14F of the base 14. A through hole 16H is formed in the fixed pressure plate 16. The through hole 16H is used to insert a nozzle of an injection device that injects resin into the metal mold 12. The through hole 16H passes through the fixed pressure plate 16 along a first direction D1. A fixed mold 12A is mounted on the side of the fixed pressure plate 16 opposite to the injection device side.

[0042] The rear pressure plate 18 is disposed on the side opposite to the injection device side of the fixed pressure plate 16. The rear pressure plate 18 is separate from the fixed pressure plate 16. The rear pressure plate 18 extends upward from the mounting surface 14F of the base 14. Furthermore, the rear pressure plate 18 can be fixed to the base 14 or configured to be movable relative to the base 14.

[0043] Each of the multiple connecting rods 20 is a rod-shaped component connecting the fixed pressure plate 16 and the rear pressure plate 18. One end of each connecting rod 20 is fixed to the fixed pressure plate 16, and the other end is fixed to the rear pressure plate 18. The multiple connecting rods 20 extend in the same direction. In this embodiment, there are four connecting rods 20. The extension direction of each of the four connecting rods 20 is designated as a first direction D1. Furthermore, in this embodiment, two of the four connecting rods 20 are positioned above the through hole 16H. These two connecting rods 20 are at the same distance from the mounting surface 14F. The remaining two of the four connecting rods 20 are positioned below the through hole 16H. These remaining two connecting rods 20 are also at the same distance from the mounting surface 14F.

[0044] A movable pressure plate 22 is disposed between the fixed pressure plate 16 and the rear pressure plate 18. The movable pressure plate 22 is configured to move along the extension direction of the connecting rods 20. Four connecting rods 20 pass through the movable pressure plate 22 respectively. A moving mold 12B is installed in the region inside the four connecting rods 20 and on the side of the movable pressure plate 22 opposite to the fixed pressure plate 16.

[0045] Support member 24 supports movable pressure plate 22. Support member 24 is disposed on base 14 via guide member 26. Guide member 26 is not particularly limited as long as it is a component that guides support member 24 so that it can slide relative to base 14 along the extension direction of connecting rod 20. In this embodiment, guide member 26 is mounted on mounting surface 14F of base 14. In addition, in this embodiment, guide member 26 has guide rail 28 extending along first direction D1 and sliding portion 30 that engages with guide rail 28.

[0046] The support member 24 is fixed to the sliding part 30 in a manner that does not impede the sliding of the sliding part 30 relative to the guide rail 28. Therefore, the movable pressure plate 22 supported by the support member 24 can move along the extension direction of the connecting rod 20 in both the mold closing direction and the mold opening direction. Furthermore, the mold closing direction is the direction in which the movable mold 12B is closed relative to the fixed mold 12A mounted on the fixed pressure plate 16. The mold opening direction is the direction in which the movable mold 12B is opened relative to the fixed mold 12A.

[0047] Figure 2 Indicates inclusion Figure 1 The movable pressure plate 22 is located around its periphery. Support members 24 are symmetrically arranged with respect to a plane F1 (hereinafter referred to as the virtual vertical plane F1) that passes through the virtual line VL and is orthogonal to the mounting surface 14F of the base 14. Furthermore, the virtual line VL is a virtual line that passes through the center of the through hole 16H of the fixed pressure plate 16 and extends straight along the extending direction of the connecting rod 20. Similarly to the support members 24, guide members 26 are also symmetrically arranged with respect to the virtual vertical plane F1. Furthermore, in Figure 2 In the original text, the guide component 26 and the moving mold 12B are omitted.

[0048] Both support members 24 have the same structure. Therefore, only one support member 24 will be described below. The support member 24 has a foot 32, a support column 34, and a connecting part 36.

[0049] The foot 32 is the base portion of the support member 24. The foot 32 is fixed to the sliding portion 30 of the guide member 26. Figure 1 The shape and number of feet 32 ​​are not particularly limited. In this embodiment, as... Figure 2 As shown, one foot 32 is formed as a rod extending along the first direction D1. Alternatively, the foot 32 may be omitted.

[0050] The support column 34 is a portion that extends toward the side (upper side) away from the base 14. The support column 34 is configured to be closer to the rear pressure plate 18 (see reference) than the side of the movable pressure plate 22 facing the fixed pressure plate 16. Figure 1The support portion 34 is fixed to the foot portion 32. Alternatively, if the foot portion 32 is omitted, the support portion 34 is fixed to the sliding portion 30 of the guide member 26. The support portion 34 can be integrally formed with the foot portion 32 (or the sliding portion 30), or it can be connected to the foot portion 32 (or the sliding portion 30) by fasteners such as bolts. The shape and number of support portions 34 are not particularly limited. In this embodiment, as... Figure 2 As shown, a support portion 34 is formed as a rod extending along a third direction D3 and is integrally formed with a foot portion 32.

[0051] The connecting portion 36 extends from the support portion 34 toward the fixed pressure plate 16 along the extending direction of the connecting rod 20. The connecting portion 36 is connected to the movable pressure plate 22. The connecting portion 36 is configured to be closer to the rear pressure plate 18 (see reference) than the surface of the movable pressure plate 22 facing the fixed pressure plate 16. Figure 1 The connecting portion 36 can be integrally formed with the support portion 34, or it can be connected to the support portion 34 by fasteners such as bolts. The connecting portion 36 extending from the support portion 34 is fixed to the protruding member 38 provided on the movable pressure plate 22. Regarding the fixing of the connecting portion 36 to the protruding member 38, fasteners such as bolts arranged along the first direction D1 are used, for example.

[0052] The protruding part 38 is a part that protrudes outward from the movable pressure plate 22 in the width direction (second direction D2) of the base 14, which is orthogonal to the extension direction (first direction D1) of the connecting rod 20. The protruding part 38 may be integrally formed with the movable pressure plate 22, or it may be connected to the movable pressure plate 22 by fasteners such as bolts.

[0053] The shape and number of connecting portions 36 are not particularly limited. In this embodiment, there are two connecting portions 36 in one support member 24. Each of the two connecting portions 36 is formed in the shape of a rod. The two connecting portions 36 extend from the support portion 34 towards the fixed pressure plate 16 along the extending direction (first direction D1) of the connecting rod 20. The two connecting portions 36 are positioned relative to the virtual line VL on the lower side (base 14 side) and the upper side (opposite to the base 14 side). Figure 1 and Figure 2 As shown, two connecting parts 36 are arranged symmetrically with respect to the surface F2 (hereinafter referred to as virtual parallel surface F2) which passes through the virtual line VL and is parallel to the mounting surface 14F of the base 14.

[0054] Figure 3This is a conceptual diagram illustrating the forces generated in the mold clamping device 10 of the first embodiment. Between the fixed pressure plate 16 and the movable pressure plate 22 of the mold clamping device 10, the connecting rod 20 thermally expands due to the heat generated in the metal mold 12. The connecting rod 20 positioned on the upper side (opposite to the base 14 side) tends to have a greater degree of thermal expansion than the connecting rod 20 positioned on the lower side (base 14 side). Therefore, as indicated by arrow A1, a force acts on the movable pressure plate 22 in a manner that causes it to tilt towards the rear pressure plate 18.

[0055] On the other hand, due to the heat generated in the metal mold 12, the support member 24 supporting the movable pressure plate 22 also thermally expands. The thermal expansion of the connecting portion 36 located on the upper side (opposite to the base 14 side) tends to be greater than that of the connecting portion 36 located on the lower side (base 14 side). Therefore, as shown by arrow A2, a force acts on the movable pressure plate 22 in such a way that it tilts towards the fixed pressure plate 16. That is, the force on the movable pressure plate 22 due to the thermal expansion of the connecting portion 36 acts to counteract the force on the movable pressure plate 22 due to the thermal expansion of the connecting rod 20. As long as the connecting portion 36 of the support member 24 extends from the support portion 34 along the extending direction of the connecting rod 20 towards the fixed pressure plate 16 and connects to the movable pressure plate 22, the above-mentioned force relationship holds regardless of the number and position of the connecting rod 20 and the connecting portion 36.

[0056] As described above, in this embodiment, the support member 24 for supporting the movable pressure plate 22 is connected to the movable pressure plate 22 via a connecting portion 36. The connecting portion 36 extends along the extending direction of the connecting rod 20 from a support portion 34 disposed near the rear pressure plate 18 relative to the surface of the movable pressure plate 22 facing the fixed pressure plate 16. Therefore, the force acting on the movable pressure plate 22 due to the thermal expansion of the connecting portion 36 can counteract the force acting on the movable pressure plate 22 due to the thermal expansion of the connecting rod 20. Thus, it is possible to prevent the movable pressure plate 22 from tilting, thereby compromising the parallelism between the fixed pressure plate 16 and the movable pressure plate 22.

[0057] Furthermore, in this embodiment, the support member 24 is mounted on the base 14 via the guide member 26. This allows the movable pressure plate 22 to be supported while suppressing its movable load.

[0058] Furthermore, in this embodiment, the support members 24 are arranged symmetrically with respect to the virtual vertical plane F1. This suppresses the deviation of the supporting force of the two support members 24 on the movable pressure plate 22, thereby enabling stable support of the movable pressure plate 22.

[0059] Furthermore, in this embodiment, the connecting portion 36 of the support member 24 is fixed to a protruding member 38 that protrudes outward from the movable pressure plate 22 toward the base 14 in the width direction (second direction D2). This allows the support member 24 to be positioned outside the movable area of ​​the movable pressure plate 22.

[0060] Furthermore, the two connecting portions 36 supported by the support member 24 are positioned on the lower side (base 14 side) and the upper side (opposite to the base 14 side) relative to the virtual line VL. As a result, in the event of thermal expansion of the connecting portions 36, the movable pressure plate 22 can generate a force that causes the movable pressure plate 22 to tilt toward the fixed pressure plate 16.

[0061] Furthermore, the connecting portion 36 is symmetrically arranged with respect to the virtual parallel plane F2. As a result, deviations in the supporting force of the support member 24 on the movable pressure plate 22 can be suppressed, thereby enabling stable support of the movable pressure plate 22.

[0062] [Second Implementation]

[0063] Figure 4 This is a schematic diagram showing the mold clamping device 10 according to the second embodiment. Figure 4 In this embodiment, structures identical to those described in the first embodiment are labeled with the same reference numerals. Furthermore, in the second embodiment, descriptions that are repeated in the first embodiment are omitted.

[0064] In the mold clamping device 10 of the second embodiment, a new support member 24X is provided. The support member 24X supports the fixed pressure plate 16. The support member 24X is directly provided on the base 14 without passing through the guide member 26.

[0065] Figure 5 Indicates inclusion Figure 4 The periphery of the fixed pressure plate 16. Furthermore, in Figure 5 In this diagram, the fixed mold 12A is omitted. The two support members 24X are arranged symmetrically with respect to the virtual vertical plane F1, similar to support member 24. The structures of the two support members 24X are identical. Therefore, only one support member 24X will be described below. Support member 24X has a foot 32X, a support column 34X, and a connecting part 36X.

[0066] The foot 32X is the base portion of the support member 24X. The foot 32X is fixed to the base 14. The shape and number of the feet 32X are not particularly limited. In this embodiment, as... Figure 5 As shown, there is one foot 32X. The single foot 32X is formed in a rod shape. Furthermore, the single foot 32X extends along the first direction D1. Alternatively, the foot 32X may be omitted.

[0067] The support portion 34X is the part that extends toward the side (upper side) away from the base 14. The support portion 34X is configured to be closer to the injection device (the side opposite to the movable pressure plate 22 side) than the side of the fixed pressure plate 16 facing the movable pressure plate 22 (see reference). Figure 4 The support portion 34X is fixed to the foot portion 32X. Alternatively, if the foot portion 32X is omitted, the support portion 34X is fixed to the base 14. The support portion 34X can be integrally formed with the foot portion 32X (or the base 14), or it can be connected to the foot portion 32X (or the base 14) by fasteners such as bolts. The shape and number of the support portions 34X are not particularly limited. In this embodiment, as... Figure 5 As shown, there is one support portion 34X. The single support portion 34X is formed in the shape of a rod. In addition, the single support portion 34X extends along the third direction D3. The single support portion 34X can also be integrally formed with the foot portion 32X.

[0068] The connecting portion 36X extends from the support portion 34X along the extending direction of the connecting rod 20 toward the movable pressure plate 22. The connecting portion 36X is connected to the fixed pressure plate 16. The connecting portion 36X is configured such that its side facing the movable pressure plate 22 is closer to the injection device than the side of the fixed pressure plate 16 (opposite to the side facing the movable pressure plate 22) (see reference). Figure 4 The connecting portion 36X can be integrally formed with the support portion 34X, or it can be connected to the support portion 34X by fasteners such as bolts. The connecting portion 36X extending from the support portion 34X is fixed to the protruding member 38X provided on the fixed pressure plate 16. Regarding the fixing of the connecting portion 36X to the protruding member 38X, fasteners such as bolts arranged along the first direction D1 are used, for example.

[0069] The protruding part 38X protrudes outward from the fixed pressure plate 16 in the width direction (second direction D2) of the base 14, which is orthogonal to the extension direction (first direction D1) of the connecting rod 20. The protruding part 38X can be integrally formed with the fixed pressure plate 16, or it can be connected to the fixed pressure plate 16 by fasteners such as bolts.

[0070] The shape and number of the connecting portions 36X are not particularly limited. In this embodiment, there are two connecting portions 36X. Each of the two connecting portions 36X is formed in the shape of a rod. Each of the two connecting portions 36X extends from the support portion 34X toward the movable pressure plate 22 along the extending direction (first direction D1) of the connecting rod 20. The two connecting portions 36X are positioned relative to the virtual line VL on the lower side (base 14 side) and the upper side (opposite to the base 14 side). Figure 4 and Figure 5 As shown, the two connecting parts 36X are symmetrically arranged with respect to the virtual parallel plane F2.

[0071] Figure 6This is a conceptual diagram illustrating the forces generated in the mold clamping device 10 according to the second embodiment. Between the fixed pressure plate 16 and the movable pressure plate 22 of the mold clamping device 10, the connecting rod 20 thermally expands due to the heat generated in the metal mold 12. The connecting rod 20 disposed on the upper side (the side opposite to the base 14 side) tends to have a greater degree of thermal expansion than the connecting rod 20 disposed on the lower side (the base 14 side). Therefore, as indicated by arrow A10, a force acts on the fixed pressure plate 16 in a manner that causes the fixed pressure plate 16 to tilt towards the injection device (the side opposite to the movable pressure plate 22 side).

[0072] On the other hand, due to the heat generated in the metal mold 12, the support member 24X supporting the fixed pressure plate 16 also thermally expands. The thermal expansion of the connecting portion 36X located on the upper side (opposite to the base 14 side) tends to be greater than that of the connecting portion 36X located on the lower side (base 14 side). Therefore, as indicated by arrow A20, a force acts on the fixed pressure plate 16 in such a way that it tilts towards the movable pressure plate 22. That is, the force on the fixed pressure plate 16 due to the thermal expansion of the connecting portion 36X acts to counteract the force on the fixed pressure plate 16 due to the thermal expansion of the connecting rod 20. As long as the connecting portion 36X of the support member 24X extends from the support portion 34X along the extending direction of the connecting rod 20 towards the movable pressure plate 22 and connects to the fixed pressure plate 16, the above-mentioned force relationship holds regardless of the number and position of the connecting rod 20 and the connecting portion 36X.

[0073] As described above, in this embodiment, the support member 24X supporting the fixed pressure plate 16 is connected to the fixed pressure plate 16 via a connecting portion 36X. The connecting portion 36X extends along the extending direction of the connecting rod 20 from the support portion 34X, which is positioned close to the injection device relative to the surface of the fixed pressure plate 16 facing the movable pressure plate 22. Therefore, the force acting on the fixed pressure plate 16 due to the thermal expansion of the connecting portion 36X can counteract the force acting on the fixed pressure plate 16 due to the thermal expansion of the connecting rod 20. Thus, it is possible to prevent the fixed pressure plate 16 from tilting, thereby disrupting the parallelism between the fixed pressure plate 16 and the movable pressure plate 22.

[0074] Furthermore, in this embodiment, since the support member 24 of the first embodiment is provided, tilting of both the fixed pressure plate 16 and the movable pressure plate 22 can be suppressed. Therefore, it is possible to further suppress the situation where the parallelism between the fixed pressure plate 16 and the movable pressure plate 22 is compromised.

[0075] Furthermore, in this embodiment, the support member 24X is symmetrically arranged with respect to the virtual vertical plane F1. This suppresses deviations in the supporting force of the support member 24X on the fixed pressure plate 16, thereby enabling stable support of the fixed pressure plate 16.

[0076] Furthermore, in this embodiment, the connecting portion 36X of the support member 24X is fixed to a protruding member 38X that protrudes outward from the fixed pressure plate 16 in the width direction (second direction D2) towards the base 14. As a result, the support member 24X can be arranged outside the region on the opposite side of the fixed pressure plate 16 facing the movable pressure plate 22.

[0077] Furthermore, the connecting portion 36X is positioned on the lower side (base 14 side) and the upper side (opposite to the base 14 side) relative to the virtual line VL. As a result, in the event of thermal expansion of the connecting portion 36X, the fixed pressure plate 16 can generate a force that causes it to tilt toward the movable pressure plate 22.

[0078] Furthermore, the connecting portion 36X is symmetrically arranged with respect to the virtual parallel plane F2. As a result, deviations in the supporting force of the supporting member 24X on the fixed pressure plate 16 can be suppressed, and the fixed pressure plate 16 can be stably supported.

[0079] [Variation Example]

[0080] Preferred embodiments of the present invention have been described, but the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0081] For example, in the mold clamping device 10 of the second embodiment, the connecting portion 36 and the protruding portion 38 of the support member 24 can be omitted. Furthermore, in the mold clamping device 10 of the second embodiment, the support column portion 34 of the support member 24 can also be fixed to the surface of the base 14 of the movable pressure plate 22 in the width direction (second direction D2). In fixing the support column portion 34 to the movable pressure plate 22, fasteners such as bolts arranged along the second direction D2 are used. This prevents the parallelism between the fixed pressure plate 16 and the movable pressure plate 22 from being compromised.

[0082] To summarize the above, the following is a summary.

[0083] The present invention is a mold clamping device (10) for an injection molding machine, comprising: a base (14); a fixed pressure plate (16) fixed on the base (14); a rear pressure plate (18) disposed separately from the fixed pressure plate (16) on the base (14); a plurality of connecting rods (20) connecting the fixed pressure plate (16) and the rear pressure plate (18); and a movable pressure plate (22) through which the connecting rods (20) pass and is configured to move along the extension direction of the through connecting rods (20).

[0084] The first type of mold clamping device (10) includes a support member (24) provided on a base (14) for supporting a movable pressure plate (22). The support member (24) includes a support column (34) extending toward a side away from the base (14); and a connecting portion (36) extending from the support column (34) toward the fixed pressure plate (16) along the extending direction and connecting to the movable pressure plate (22). Thus, the force acting on the movable pressure plate (22) due to the thermal expansion of the connecting portion (36) can counteract the force acting on the movable pressure plate (22) due to the thermal expansion of the connecting rod (20). Therefore, the situation where the movable pressure plate (22) tilts, disrupting the parallelism between the fixed pressure plate (16) and the movable pressure plate (22), is prevented. This suppresses the tilting of the pressure plate.

[0085] The first type of mold clamping device (10) includes a guide member (26) that guides the support member (24) to the base (14) in such a way that the support member (24) can slide along the extension direction. The support member (24) can be mounted on the base (14) via the guide member (26). Thus, the movable pressure plate 22 can be supported while suppressing the movable load of the movable pressure plate 22.

[0086] The first type of mold clamping device (10) includes a protruding member (38) which is provided on a movable pressure plate (22) and protrudes outward from the movable pressure plate (22) in the width direction of the base (14) orthogonal to the extension direction. A connecting portion (36) extending from the support column (34) can be fixed to the protruding member (38). As a result, a support member 24 can be arranged outside the movable area of ​​the movable pressure plate 22.

[0087] The second type of mold clamping device (10) includes a support member (24X) provided on the base (14) for supporting the fixed pressure plate (16). The support member (24X) includes: a support column (34X) extending toward a side away from the base (14); and a connecting part (36X) extending from the support column (34X) toward the movable pressure plate (22) along the extending direction and connecting to the fixed pressure plate (16). Thus, the force acting on the fixed pressure plate (16) due to the thermal expansion of the connecting part (36X) can counteract the force acting on the fixed pressure plate (16) due to the thermal expansion of the connecting rod (20). Therefore, the situation where the fixed pressure plate (16) tilts and the parallelism between the fixed pressure plate (16) and the movable pressure plate (22) is disrupted is prevented. This suppresses the tilting of the pressure plate.

[0088] The second type of mold clamping device (10) includes a protruding member (38X) which is provided on the fixed pressure plate (16) and protrudes outward from the fixed pressure plate (16) in the width direction of the base (14) orthogonal to the extending direction. A connecting portion (36X) extending from the support portion (34X) can be fixed to the protruding member (38X). Thus, a support member (24X) can be arranged outside the region on the opposite side of the fixed pressure plate (16) from the side opposite to the movable pressure plate (22).

[0089] In the first or second type of mold clamping device (10), the connecting parts (36, 36X) can be arranged relative to the virtual line (VL) on the opposite side of the base (14) side, wherein the virtual line (VL) passes through the center of the through hole (16H) of the fixed pressure plate (16) through which the nozzle is inserted and extends straight along the extension direction. Thus, in the first type, when the connecting part 36 thermally expands, a force can be applied to the movable pressure plate (22) to tilt it toward the fixed pressure plate (16). In the second type, when the connecting part (36X) thermally expands, a force can be applied to the fixed pressure plate (16) to tilt it toward the movable pressure plate (22).

[0090] In the first or second type of mold clamping device (10), the connecting parts (36, 36X) can be arranged symmetrically with respect to the surface (F2), wherein the surface (F2) passes through the virtual line (VL) and is parallel to the mounting surface (14F) of the base (14) on which the fixed pressure plate (16) is mounted. As a result, deviations in the supporting force of the supporting members (24, 24X) on the pressure plate can be suppressed, thereby enabling stable support of the pressure plate.

[0091] In the first or second type of mold clamping device (10), the support members (24, 24X) can be symmetrically arranged with respect to a surface (F1) that passes through a virtual line (VL) and is orthogonal to the mounting surface (14F) of the base (14) on which the fixed pressure plate (16) is mounted. The virtual line (VL) passes through the center of the through hole (16H) of the fixed pressure plate (16) through which the nozzle is inserted and extends straight along the extension direction. As a result, deviations in the supporting force of the support members (24, 24X) on the pressure plate can be suppressed, thereby enabling stable support of the pressure plate.

Claims

1. A clamp device of an injection molding machine, comprising: a base; a fixed platen fixed to the base; a rear platen disposed on the base separately from the fixed platen; a plurality of connecting rods linking the fixed platen and the rear platen; and a movable platen through which the connecting rods are inserted and which is arranged to be movable in an extension direction along the inserted connecting rods, characterized in that the clamp device comprises: a support member arranged on the base for supporting the movable platen; and a protruding member arranged on the movable platen and protruding from the movable platen to an outside of a width direction of the base orthogonal to the extension direction, the support member comprises: a support column portion extending toward a side away from the base; and a linking portion extending from the support column portion to the fixed platen side in the extension direction and linking the movable platen, and the protruding member and the support column portion are arranged at intervals in the extension direction by the linking portion.

2. The clamp device according to claim 1, characterized in that the clamp device comprises a guide member that guides the support member to the base in a manner that the support member is slidable in the extension direction, and the support member is arranged on the base via the guide member.

3. A clamp device of an injection molding machine, comprising: a base; a fixed platen fixed to the base; a rear platen disposed on the base separately from the fixed platen; a plurality of connecting rods linking the fixed platen and the rear platen; and a movable platen through which the connecting rods are inserted and which is arranged to be movable in an extension direction along the inserted connecting rods, characterized in that the clamp device comprises: a support member arranged on the base for supporting the fixed platen; and a protruding member arranged on the fixed platen and protruding from the fixed platen to an outside of a width direction of the base orthogonal to the extension direction, the support member comprises: a support column portion extending toward a side away from the base; and a linking portion extending from the support column portion to the movable platen side in the extension direction and linking the fixed platen, and the protruding member and the support column portion are arranged at intervals in the extension direction by the linking portion.

4. The clamp device according to any one of claims 1 to 3, characterized in that the linking portion is arranged on the base side and on the opposite side of the base side with respect to a virtual line that passes through a center of a through-hole of the fixed platen through which a nozzle is inserted and extends straight in the extension direction.

5. The clamp device according to claim 4, characterized in that the linking portion is arranged symmetrically with respect to a plane that passes through the virtual line and is parallel to a mounting surface of the base on which the fixed platen is mounted.

6. The clamp device according to claim 1, characterized in that ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The support member is symmetrically arranged with respect to a plane that passes through a virtual line and is orthogonal to a mounting surface of the base on which the fixed platen is mounted, wherein the virtual line passes through the center of the through-hole of the fixed platen through which the nozzle is inserted and extends straight along the extension direction.

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