Injection device

Abstract

According to an embodiment of the present disclosure, an injection device is provided with: a screw that can move in a predetermined direction; a front plate; a rear plate which receives a reaction force in the predetermined direction by pressing the screw through a push plate; a base that supports the front plate and the rear plate from below; and an attachment member extending in the predetermined direction. Only one plate is fixed to the base so as not to move in the predetermined direction, and the attachment member has a first member connected to the front plate and a second member connected to the rear plate and separated from the first member.

Description

Technical Field

[0001] The present disclosure relates to an injection device. Background Art

[0002] Japanese Patent Application Laid-Open No. 2020-157682 discloses a bracket (accessory component) for an injection device. The bracket is secured to a front support member and a rear support member. If the injection device includes a cover member, the cover member can be secured to the bracket. In this case, the cover member covers the entire bracket, metering motor, injection motor, front support member, and rear support member. Summary of the Invention

[0003] It is desired to improve the accuracy of injection molding using an injection device.

[0004] One embodiment of the present disclosure is an injection device that injects a molding material supplied to a cylinder into a metal mold, wherein the injection device includes: a screw, which is inserted into the above-mentioned cylinder and can move in a predetermined direction; a front plate, which fixes the above-mentioned cylinder; a push plate, which faces the front end of the above-mentioned cylinder to which the above-mentioned molding material is supplied and presses the above-mentioned screw in the above-mentioned predetermined direction; a rear plate, which is subjected to a reaction force in the above-mentioned predetermined direction by the above-mentioned push plate pressing the above-mentioned screw; a base, which supports the above-mentioned front plate and the above-mentioned rear plate from below; and an auxiliary component, which extends in the above-mentioned predetermined direction and exists at least between the above-mentioned front plate and the above-mentioned rear plate, the above-mentioned predetermined direction is the axial direction of the above-mentioned screw, and only one of the above-mentioned front plate and the above-mentioned rear plate is fixed to the above-mentioned base so as to be unable to move at least in the above-mentioned predetermined direction relative to the above-mentioned base, and the above-mentioned auxiliary component includes: a first component, which is connected to the above-mentioned front plate; and a second component, which is separate from the above-mentioned first component, and is connected to the above-mentioned rear plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 This is a diagram schematically showing an injection device according to one embodiment.

[0006] Figure 2 This is a diagram schematically showing an injection device according to Modification 1.

[0007] Figure 3 This is a diagram schematically showing an injection device according to a second modification.

[0008] Figure 4 This is a diagram schematically showing an injection device according to a third modification.

[0009] Figure 5A as well as Figure 5B It is a top view of the injection device of Modification 3. DETAILED DESCRIPTION

[0010] In an injection device, for example, a front plate may be fixed to a base, while a rear plate may be placed loosely on the base. If an accessory component is fixed to the front plate and the rear plate in this state, the following problems may occur.

[0011] The injection action of the injection device transmits a reaction force to the rear plate. This reaction force causes the rear plate, which is not fixed to the base, to move relative to the base. However, since the rear plate is fixed to the attachment, it cannot move relative to the attachment. As a result, the rear plate becomes tilted relative to the front plate, making it impossible to maintain the front and rear plates parallel. This can reduce the accuracy of injection molding.

[0012] Figure 1 This figure schematically shows an injection device 10 according to one embodiment. The injection device 10 and a mold clamping device (not shown) are used in an injection molding machine. The injection device 10 injects molding material into a metal mold. The mold clamping device opens and closes the metal mold.

[0013] The injection device 10 includes a barrel 12, a screw 14, a base 16, a front plate 18, a rear plate 20, and a plurality of tie rods 22. The injection device 10 also includes a push plate 24, an injection ball screw 26, a nut 28, and an accessory 30.

[0014] Molding material is supplied into the barrel 12. A nozzle hole 12a is formed at the front end of the barrel 12. A screw 14 is inserted into the barrel 12. The screw 14 is movable in a predetermined direction DA within the barrel 12. The predetermined direction DA is the direction of the axis AX of the screw 14. As the screw 14 moves in the predetermined direction DA within the barrel 12 toward the nozzle hole 12a, the molding material is injected from the nozzle hole 12a.

[0015] The injection device 10 is arranged with the base 16 positioned underneath. A front plate 18 and a rear plate 20 are both vertically mounted on the base 16. The base 16 supports the front plate 18 and rear plate 20 from below. The downward direction corresponds to the direction in which gravity is applied in the vertical direction DB. The front plate 18 and rear plate 20 are connected by a plurality of tie rods 22. The front plate 18 secures the barrel 12.

[0016] The push plate 24 is located between the front plate 18 and the rear plate 20 and is guided by a plurality of tie rods 22 so as to be movable in a predetermined direction DA. The push plate 24 rotatably supports the screw 14. A nut 28 is mounted on the push plate 24 and is threadably engaged with the injection ball screw 26. The rear plate 20 rotatably supports the injection ball screw 26.

[0017] When the injection ball screw 26 is driven by a motor (not shown), the push plate 24 moves in the predetermined direction DA together with the nut 28. As a result, the push plate 24 presses the screw 14 in the predetermined direction DA toward the nozzle hole 12a. As described above, the molding material is injected from the nozzle hole 12a.

[0018] In addition, the push plate 24 pushes the screw 14 inward, and the rear plate 20 receives a reaction force in a predetermined direction DA. The direction of the reaction force received by the rear plate 20 is opposite to the direction in which the screw 14 moves.

[0019] The accessory part 30 extends along the predetermined direction DA and exists at least between the front plate 18 and the rear plate 20. Figure 1 As shown, the accessory component 30 may not completely cover the space between the front plate 18 and the rear plate 20 in the predetermined direction DA.

[0020] exist Figure 1 In the embodiment, the attachment member 30 is provided to cover the upper surfaces of the front plate 18 and the rear plate 20 , but may be provided to cover the side surfaces of the front plate 18 and the rear plate 20 .

[0021] In this embodiment, the accessory component 30 is capable of mounting a cover (not shown) of the injection device 10. However, the accessory component 30 itself may serve as the cover of the injection device 10. Furthermore, the accessory component 30 may be used for purposes other than mounting a cover. For example, the accessory component 30 may be used for cable routing. Components other than the cover may also be mounted on the accessory component 30.

[0022] The accessory part 30 includes a first part 30a and a second part 30b which is separate from the first part 30a. The first part 30a is connected to the front plate 18. The second part 30b is connected to the rear plate 20. Figure 1 In the illustrated example, the first member 30 a and the second member 30 b are separated from each other by a gap GA, but they do not necessarily need to be separated from each other.

[0023] Only one of the front plate 18 and the rear plate 20 is fixed to the base 16 so as to be immovable at least in the predetermined direction DA relative to the base 16. In this embodiment, only the front plate 18 is fixed to the base 16 by, for example, bolting or welding. Therefore, the front plate 18 is immovable relative to the base 16 in the predetermined direction DA.

[0024] In addition, for ease of understanding, Figure 1 1 and 2 show that the front plate 18 is supported by the support portion F1 of the base 16. The front plate 18 is fixed to the base 16 at the support portion F1.

[0025] The other of the front plate 18 and the rear plate 20 is supported by the base 16 so as to be movable in the predetermined direction DA relative to the base 16. In the present embodiment, the rear plate 20 is not fixed to the base 16.

[0026] The rear plate 20 may be supported by the base 16 via a sliding mechanism SR. In this case, the rear plate 20 can be moved relative to the base 16 in a predetermined direction DA by the sliding mechanism SR. Figure 1It is shown that the rear plate 20 is supported on a supporting portion R1 of the base 16 .

[0027] The sliding mechanism SR enables smooth linear movement of the rear plate 20. The sliding mechanism SR is comprised of, for example, guide rails, rollers, or bearings disposed between the rear plate 20 and the base 16. The convex and concave portions formed on one side of the rear plate 20 and the other side of the base 16 also function as the sliding mechanism SR. When the rear plate 20 is moved by the sliding mechanism SR, friction and vibration caused by the movement are minimized. This prevents damage to the rear plate 20 and other components.

[0028] Alternatively, the slide mechanism SR may not be used, and only the rear plate 20 may be placed on the base 16. The rear plate 20 may be not fixed to the base 16 but may be movable relative to the base 16 in the predetermined direction DA.

[0029] In this embodiment, the first component 30a is connected to the front panel 18 at a support portion F2 where the front panel 18 supports the first component 30a. The second component 30b is connected to the rear panel 20 at a support portion R2 where the rear panel 20 supports the second component 30b.

[0030] As described above, the rear panel 20 is sometimes subjected to a reaction force in the predetermined direction DA. In this embodiment, the rear panel 20, along with the second component 30b, can move relative to the base 16 in the predetermined direction DA, away from the front panel 18, in response to the reaction force applied to the rear panel 20. In other words, the rear panel 20, along with the second component 30b, can move unrestricted relative to the base 16. Therefore, the front panel 18 and the rear panel 20 can be maintained parallel to each other.

[0031] However, when the cover is attached to the attachment member 30, the cover can slide relative to the attachment member 30 in response to movement of the attachment member 30 (the first member 30a and the second member 30b) relative to the base 16. The cover being able to slide relative to the attachment member 30 can prevent deformation of the cover due to movement of the attachment member 30.

[0032] Alternatively, only the rear plate 20 may be fixed to the base 16. In this case, the front plate 18 is not fixed to the base 16. Based on the reaction force applied to the rear plate 20, the front plate 18 can move relative to the base 16 along the predetermined direction DA, away from the rear plate 20, together with the first member 30a. In other words, the front plate 18 can move relative to the base 16 without restriction, together with the first member 30a. Even in this case, the front plate 18 and the rear plate 20 can be maintained parallel.

[0033] The above embodiment can also be modified as follows. In the following modification, the description repeated with the embodiment is omitted. In addition, in the drawings used in the following modification, the same symbols are marked for the same structures as those described in the embodiment.

[0034] (Variant 1)

[0035] In the above embodiment, the front plate 18 and the rear plate 20 are formed separately and connected to each other via the plurality of tie rods 22. However, the front plate 18 and the rear plate 20 may be formed integrally without the plurality of tie rods 22. Figure 2 1 is a diagram schematically showing an injection device 10 according to Modification 1. In Modification 1, the front plate 18 and the rear plate 20 are integrally formed.

[0036] The push plate 24 is supported from below by the base 16 between the front plate 18 and the rear plate 20. Figure 2 As shown, the push plate 24 may be supported by the base 16 via a slide mechanism SP. The push plate 24 is guided by the base 16 and can move linearly in a predetermined direction DA. Alternatively, the push plate 24 may be placed on the base 16 without using the slide mechanism SP.

[0037] The slide mechanism SP is composed of, for example, guide rails, rollers, or bearings provided between the push plate 24 and the base 16. Convex and concave portions formed on one of the push plate 24 and the base 16 can also serve as the slide mechanism SP.

[0038] In this modification 1, the rear plate 20 can also move relative to the base 16 and the attachment 30 in the predetermined direction DA away from the front plate 18 according to the reaction force received by the rear plate 20. Therefore, the front plate 18 and the rear plate 20 can be kept parallel.

[0039] (Variant 2)

[0040] Figure 3 This figure schematically illustrates an injection device 10 according to a second modification. The first component 30a and the second component 30b may also be connected so as to be relatively movable in a predetermined direction DA. In this second modification, the first component 30a and the second component 30b are connected to each other via a sliding mechanism SL. The sliding mechanism SL enables relative movement of the first component 30a and the second component 30b.

[0041] Therefore, if Figure 3 As shown, the attachment member 30 can completely cover the space between the front plate 18 and the rear plate 20 in the predetermined direction DA. In this case, the cover can be easily hooked onto the injection device 10.

[0042] The sliding mechanism SL facilitates the relative movement of the first and second components 30a, 30b. The sliding mechanism SL is comprised of, for example, a guide rail or bearing disposed between the first and second components 30a, 30b. The convex and concave portions formed on one and the other of the first and second components 30a, 30b, respectively, can also serve as the sliding mechanism SL.

[0043] In this modification 2, only the front plate 18 is fixed to the base 16 by, for example, bolting or welding. Figure 3 The rear panel 20 is fixed to the base 16 at the support portion F1 shown. Based on the reaction force applied to the rear panel 20, the rear panel 20, together with the second component 30b, can move relative to the base 16 in a predetermined direction DA away from the front panel 18. In other words, the rear panel 20, together with the second component 30b, can move unrestricted relative to the base 16. Therefore, the front panel 18 and the rear panel 20 can be maintained parallel.

[0044] However, when the cover is attached to the attachment member 30 , the cover can slide relative to the moving attachment member 30 (the first member 30 a and the second member 30 b ).

[0045] Alternatively, only the rear plate 20 may be fixed to the base 16. In this case, the front plate 18 is not fixed to the base 16. Based on the reaction force applied to the rear plate 20, the front plate 18 can move relative to the base 16 along the predetermined direction DA, away from the rear plate 20, together with the first member 30a. In other words, the front plate 18 can move relative to the base 16 without restriction, together with the first member 30a. Even in this case, the front plate 18 and the rear plate 20 can be maintained parallel.

[0046] (Variant 3)

[0047] Figure 4 This figure schematically illustrates an injection device 10 according to a third modification. In this third modification, only the front plate 18 is fixed to the base 16. The rear plate 20 is not fixed to the base 16. The first member 30a is rotatably connected to the front plate 18 via a first rotation axis B1 extending in a vertical direction DB intersecting the predetermined direction DA. A bearing may be provided between the first rotation axis B1 and the first member 30a.

[0048] The second member 30b is rotatably connected to the rear plate 20 via a second rotation axis B2 parallel to the first rotation axis B1. A bearing may be provided between the second rotation axis B2 and the second member 30b.

[0049] The first member 30a and the second member 30b are rotatably connected to each other via a third rotation axis B3 parallel to the first rotation axis B1. Bearings may be provided between the third rotation axis B3 and the first member 30a and between the third rotation axis B3 and the second member 30b.

[0050] The first rotation axis B1 and the third rotation axis B3 are respectively arranged at both ends of the length direction of the first member 30a. The end of the first member 30a where the first rotation axis B1 is arranged corresponds to the support portion F2 (see FIG. 1 ) where the front plate 18 supports the first member 30a in the above embodiment. Figure 1The second rotation axis B2 and the third rotation axis B3 are respectively arranged at both ends of the second component 30b in the longitudinal direction. The end of the second component 30b where the second rotation axis B2 is arranged corresponds to the support portion R2 of the rear plate 20 supporting the second component 30b in the above embodiment (refer to Figure 1 ).

[0051] Figure 5A and Figure 5B It is a top view of the injection device 10 according to the third modification. Figure 5A The following illustrates the initial state of the accessory component 30 before injection molding. The first component 30a extends in a first direction D1 that differs from the second component 30b in a second direction D2. When injection molding begins, the rear plate 20 moves relative to the base 16 in a predetermined direction DA, away from the front plate 18, in response to a reaction force applied to the rear plate 20.

[0052] As the rear panel 20 moves in the predetermined direction DA, the first component 30a rotates about the first rotation axis B1. The second component 30b rotates about the second rotation axis B2. The first component 30a and the second component 30b rotate relative to each other about the third rotation axis B3. When the rear panel 20 moves away from the front panel 18, both the first direction D1 and the second direction D2 change and approach the predetermined direction DA.

[0053] The movable positions of the rear panel 20 are limited by the distance between the ends of the first component 30a and the distance between the ends of the second component 30b. As described above, the first rotation axis B1 and the third rotation axis B3 are arranged at the ends of the first component 30a. The second rotation axis B2 and the third rotation axis B3 are arranged at the ends of the second component 30b.

[0054] Therefore, the distance between the two ends of the first component 30a and the distance between the two ends of the second component 30b can be determined based on the position where the rear plate 20 can move to the maximum extent due to the reaction force. Based on the distance between the two ends of the first component 30a and the distance between the two ends of the second component 30b, the lengths of the first component 30a and the second component 30b in the longitudinal direction can be determined. The longer the lengths of the first component 30a and the second component 30b in the longitudinal direction are, the better the Figure 5A In the initial state shown, the angle formed by the first direction D1 and the second direction D2 is larger.

[0055] Figure 5BThe following illustrates the state of the accessory component 30 after the rear panel 20 has moved to its maximum extent. Both the first direction D1 and the second direction D2 correspond to the predetermined direction DA. Thus, by rotating the first component 30a and the second component 30b, the rear panel 20 can move in the predetermined direction DA. This allows the front panel 18 and the rear panel 20 to remain parallel. However, the cover attached to the accessory component 30 can slide relative to the moving accessory component 30.

[0056] Alternatively, only the rear plate 20 may be fixed to the base 16. In this case, the front plate 18 is not fixed to the base 16. Based on the reaction force applied to the rear plate 20, the front plate 18 can move relative to the base 16 in a predetermined direction DA away from the rear plate 20. Even in this case, the front plate 18 and the rear plate 20 can be maintained parallel.

[0057] (Variant 4)

[0058] The above-mentioned modifications 1 to 3 may be appropriately combined within a range not in conflict.

[0059] In the above-described embodiment and the modified example, the front plate 18 and the rear plate 20 are kept parallel during injection molding, thereby improving the precision of injection molding and preventing damage to the attachment member 30 .

[0060] The following supplementary notes are further disclosed regarding the above-mentioned embodiment and modifications.

[0061] (Note 1)

[0062] The present invention discloses an injection device 10 for injecting a molding material supplied into a cylinder 12 into a metal mold, and includes: a screw 14 inserted into the cylinder and movable in a predetermined direction DA; a front plate 18 that fixes the cylinder; a push plate 24 that faces the front end of the cylinder into which the molding material is supplied and presses the screw in the predetermined direction; a rear plate 20 that is subjected to a reaction force in the predetermined direction as the push plate presses the screw; a base 16 that supports the front plate and the rear plate from below; and an auxiliary member 30 that extends in the predetermined direction and exists at least between the front plate and the rear plate, the predetermined direction being the direction of the screw axis AX, and only one of the front plate and the rear plate being fixed to the base so as to be immovable relative to the base in at least the predetermined direction, the auxiliary member including: a first member 30a connected to the front plate; and a second member 30b that is separate from the first member and connected to the rear plate.

[0063] (Note 2)

[0064] The injection device according to Supplementary Note 1 may further include a plurality of tie rods 22 connecting the front plate and the rear plate.

[0065] (Note 3)

[0066] According to the injection device described in Supplementary Note 1, the front plate and the rear plate can be formed integrally.

[0067] (Note 4)

[0068] According to the injection device according to any one of Supplementary Notes 1 to 3, the first component and the second component are separable from each other.

[0069] (Note 5)

[0070] According to the injection device according to any one of Supplementary Notes 1 to 3, the first member and the second member may be connected so as to be relatively movable in the predetermined direction.

[0071] (Note 6)

[0072] According to the injection device described in Supplementary Note 5, the first member and the second member can be connected to each other via the sliding mechanism SL.

[0073] (Note 7)

[0074] According to the injection device described in any one of Appendixes 1 to 3, the first component may be rotatably connected to the front plate via a first rotation axis B1 extending in a direction DB intersecting the predetermined direction, the second component may be connected to the rear plate via a second rotation axis B2 parallel to the first rotation axis, and the first component and the second component may be rotatably connected to each other via a third rotation axis B3 parallel to the first rotation axis.

[0075] The present disclosure has been described in detail, but the present disclosure is not limited to the above-mentioned embodiments. These embodiments can be variously added, replaced, changed, partially deleted, etc. without departing from the scope of the present disclosure, or without departing from the scope of the present disclosure derived from the contents recorded in the claims and their equivalents. In addition, these embodiments can also be implemented in combination. For example, in the above-mentioned embodiments, the order of each action and the order of each processing are shown as an example and are not limited to this. In addition, the same applies to the case where numerical values ​​or mathematical formulas are used in the description of the above-mentioned embodiments.

[0076] Explanation of symbols

[0077] 10—injection device, 12—barrel, 14—screw, 16—base, 18—front plate, 20—rear plate, 22—pull rod, 24—push plate, 26—ball screw for injection, 28—nut, 30—accessories.

Claims

1. An injection device that injects a molding material supplied into a cylinder into a metal mold, The injection device is characterized by comprising: a screw, which is inserted into the barrel and can move in a predetermined direction; a front plate, which fixes the cylinder; a push plate directed toward the front end of the cylinder to which the molding material is supplied and pressing the screw in the predetermined direction; a rear plate, which is pressed into the screw by the push plate and receives a reaction force in the predetermined direction; a base supporting the front plate and the rear plate from below; and an auxiliary component extending along the predetermined direction and existing at least between the front plate and the rear plate, The predetermined direction is the axial direction of the screw, Only one of the front plate and the rear plate is fixed to the base so as to be unable to move relative to the base at least in the predetermined direction. The accessory component includes a first component connected to the front plate and a second component separate from the first component and connected to the rear plate.

2. The injection device according to claim 1, characterized in that A plurality of tie rods are further provided, and the tie rods connect the front plate and the rear plate.

3. The injection device according to claim 1, characterized in that The front plate and the rear plate are formed integrally.

4. The injection device according to any one of claims 1 to 3, characterized in that The first component and the second component are separated from each other.

5. The injection device according to any one of claims 1 to 3, characterized in that The first component and the second component are connected so as to be relatively movable in a predetermined direction.

6. The injection device according to claim 5, characterized in that The first component and the second component are connected to each other via a sliding mechanism.

7. The injection device according to any one of claims 1 to 3, characterized in that The first member is rotatably connected to the front plate via a first rotation axis extending in a direction intersecting the predetermined direction. The second component is connected to the rear plate via a second rotation axis parallel to the first rotation axis, The first member and the second member are rotatably connected to each other via a third rotation axis parallel to the first rotation axis.

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