Injection device

Abstract

According to an aspect of the present invention, an injection device is provided with: a screw capable of moving in a predetermined direction; a front plate; the rear plate is pressed into the screw rod through a push plate so as to be subjected to counter-acting force in the preset direction; 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 being fixed to the base so as to be at least unable to move in the predetermined direction, and only one plate being fixed to the attachment member so as to be at least unable to move in the predetermined direction.

Description

Technical Field

[0001] The present invention 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 entirety of the 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 mold, the injection device comprising: a screw that is inserted into the cylinder and is capable of moving in a predetermined direction; a front plate that fixes the cylinder; a push plate that presses the screw in the predetermined direction toward the front end of the cylinder to which the molding material is supplied; a rear plate that is subjected to a reaction force in the predetermined direction by the push plate pressing the screw; a base that supports the front plate and the rear plate from below; and an auxiliary component that extends in the predetermined direction and exists at least between the front plate and the rear plate, the predetermined direction being the axial direction of the screw, only one of the front plate and the rear plate being fixed to the base so as to be unable to move at least in the predetermined direction relative to the base, and only one of the front plate and the rear plate being fixed to the auxiliary component so as to be unable to move at least in the predetermined direction relative to the auxiliary component. 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 5 This is a diagram schematically showing an injection device according to a fourth modification.

[0010] Figure 6 This is a diagram schematically showing an injection device according to a fifth modification.

[0011] Figure 7 This is a diagram schematically showing an injection device according to a sixth modification. DETAILED DESCRIPTION

[0012] In an injection device, for example, a front plate is sometimes fixed to a base, while a rear plate is not fixed to the base. In such a state, if an accessory is fixed to the front plate and the rear plate, the following problems arise.

[0013] 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, and the front and rear plates cannot be maintained parallel. This can reduce the accuracy of injection molding.

[0014] 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 mold. The mold clamping device opens and closes the mold.

[0015] 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.

[0016] 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. When 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.

[0017] The injection device 10 is positioned with the base 16 facing downward. 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.

[0018] A push plate 24 is positioned between the front plate 18 and the rear plate 20 and is movable in a predetermined direction DA, guided by a plurality of tie rods 22. 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.

[0019] 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.

[0020] In addition, the rear plate 20 receives a reaction force in a predetermined direction DA due to the push plate 24 pressing the screw 14. The direction of the reaction force received by the rear plate 20 is opposite to the direction in which the screw 14 moves.

[0021] 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 In the example shown, the accessory member 30 completely covers the space between the front plate 18 and the rear plate 20 in the predetermined direction DA. However, the accessory member 30 does not necessarily need to completely cover the space between the front plate 18 and the rear plate 20.

[0022] exist Figure 1 In the embodiment, the attachment member 30 is provided so as to cover the upper surfaces of the front plate 18 and the rear plate 20 , but may be provided so as to cover the side surfaces of the front plate 18 and the rear plate 20 .

[0023] In this embodiment, the accessory component 30 is capable of mounting the 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 the 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.

[0024] Only one of the front plate 18 and the rear plate 20 is fixed to the base 16 so as to be unable to move 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 unable to move relative to the base 16 in the predetermined direction DA.

[0025] In addition, for ease of understanding, Figure 1 3 shows a support portion F1 where the front plate 18 is supported by the base 16. The front plate 18 is fixed to the base 16 at the support portion F1.

[0026] 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.

[0027] The rear plate 20 may be supported by the base 16 via the sliding mechanism SR1. In this case, the rear plate 20 can be moved relative to the base 16 in a predetermined direction DA by the sliding mechanism SR1. Figure 1A support portion R1 where the rear plate 20 is supported by the base 16 is shown.

[0028] The sliding mechanism SR1 enables smooth linear movement of the rear plate 20. The sliding mechanism SR1 is comprised of, for example, guide rails, rollers, or bearings disposed between the rear plate 20 and the base 16. Convex and concave portions formed on one side of the rear plate 20 and the other side of the base 16 can also be used as the sliding mechanism SR1. When the rear plate 20 is moved by the sliding mechanism SR1, friction and vibration caused by the movement are minimized. Consequently, damage to the rear plate 20 and other components can be prevented.

[0029] Alternatively, the slide mechanism SR1 may not be used, and only the rear plate 20 may be placed on the base 16. The rear plate 20 is not fixed to the base 16, and only needs to be movable relative to the base 16 in the predetermined direction DA.

[0030] Only one of the front plate 18 and the rear plate 20 is fixed to the attachment member 30 so as to be unable to move at least in the predetermined direction DA relative to the attachment member 30. In the present embodiment, only the front plate 18 is fixed to the attachment member 30 by, for example, bolting or welding. Therefore, the front plate 18 is unable to move relative to the attachment member 30 in the predetermined direction DA.

[0031] In addition, for easier understanding, Figure 1 The figure shows a support portion F2 where the front plate 18 supports the attachment member 30. The front plate 18 is fixed to the attachment member 30 at the support portion F2.

[0032] The other of the front plate 18 and the rear plate 20 supports the accessory 30 so that it can move in the predetermined direction DA relative to the accessory 30. In this embodiment, the rear plate 20 is not fixed to the accessory 30. The rear plate 20 may also support the accessory 30 via the sliding mechanism SR2. In this case, the rear plate 20 can move in the predetermined direction DA relative to the accessory 30 via the sliding mechanism SR2. In addition, for ease of understanding, Figure 1 A support portion R2 of the rear plate 20 at which the accessory component 30 is supported is shown.

[0033] The sliding mechanism SR2 facilitates the linear movement of the rear plate 20. The sliding mechanism SR2 is comprised of, for example, guide rails, rollers, or bearings disposed between the rear plate 20 and the accessory component 30. The convex and concave portions formed on one side of the rear plate 20 and the other side of the accessory component 30 can also function as the sliding mechanism SR2. When the rear plate 20 moves via the sliding mechanism SR2, friction and vibration caused by the movement are minimized. This prevents deformation or damage to the accessory component 30 and the like.

[0034] Alternatively, the slide mechanism SR2 may not be used, and only the attachment 30 may be placed on the rear plate 20. The rear plate 20 is not fixed to the attachment 30, and only needs to be movable relative to the attachment 30 in the predetermined direction DA.

[0035] 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 is capable of moving relative to the base 16 and the attachment 30 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 is capable of unrestricted movement relative to either the base 16 or the attachment 30. Therefore, the front panel 18 and the rear panel 20 can be maintained parallel to each other.

[0036] 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.

[0037] (Variant 1)

[0038] 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.

[0039] 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 only on the base 16 without using the slide mechanism SP.

[0040] The slide mechanism SP is composed of, for example, guide rails, rollers, or bearings provided between the push plate 24 and the base 16. A convex portion and a concave portion formed on one of the push plate 24 and the base 16 may be used as the slide mechanism SP.

[0041] 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.

[0042] (Variant 2)

[0043] Figure 31 is a diagram schematically showing an injection device 10 according to a second modification. In this second modification, only the rear plate 20 is fixed to the base 16, for example, by bolting or welding. Figure 3 The support portion R1 shown is fixed to the base 16 .

[0044] In this modification 2, the front plate 18 is not fixed to the base 16. The front plate 18 may be supported by the base 16 via the sliding mechanism SF1. In this case, the front plate 18 is Figure 3 The support portion F1 shown is supported by the base 16. Alternatively, the front plate 18 may be placed only on the base 16 without using the sliding mechanism SF1.

[0045] In this modification 2, only the rear plate 20 is fixed to the attachment member 30 by, for example, bolting or welding. Figure 3 The support region R2 shown is fixed to the attachment component 30 .

[0046] The front plate 18 is not fixed to the attachment 30. The front plate 18 may also support the attachment 30 via the sliding mechanism SF2. In this case, the front plate 18 is Figure 3 The support portion F2 shown supports the attachment member 30. Alternatively, the attachment member 30 may be placed only on the front plate 18 without using the slide mechanism SF2.

[0047] As described above, the rear panel 20 is sometimes subjected to a reaction force in the predetermined direction DA. In this second modification, the front panel 18 can move relative to the base 16 and the attachment 30 in the predetermined direction DA, away from the rear panel 20, in response to the reaction force applied to the rear panel 20. In other words, the front panel 18 can move unrestricted relative to both the base 16 and the attachment 30. Therefore, the front panel 18 and the rear panel 20 can be maintained parallel.

[0048] (Variant 3)

[0049] Figure 4 Schematic diagram of the injection device 10 according to Modification 3. In Modification 3, only the front plate 18 is fixed to the base 16, and only the rear plate 20 is fixed to the attachment 30. The front plate 18 is not fixed to the attachment 30, and the rear plate 20 is not fixed to the base 16.

[0050] In this third modification, the rear plate 20 can move relative to the base 16 in a predetermined direction DA, away from the front plate 18, together with the attachment 30, in response to the reaction force applied to the rear plate 20. That is, the rear plate 20 can move relative to the base 16 without restriction, together with the attachment 30. Therefore, the front plate 18 and the rear plate 20 can be maintained parallel to each other.

[0051] Alternatively, only the rear plate 20 may be fixed to the base 16 , and only the front plate 18 may be fixed to the attachment 30 . In this case, the rear plate 20 is not fixed to the attachment 30 , and the front plate 18 is not fixed to the base 16 .

[0052] In response to the reaction force applied to the rear panel 20, the front panel 18 can move relative to the base 16 in a predetermined direction DA, together with the attachment 30, in a direction away from the rear panel 20. In other words, the front panel 18 can move relative to the base 16 without restriction, together with the attachment 30. Therefore, even in this case, the front panel 18 and the rear panel 20 can be maintained parallel.

[0053] However, the cover and other components attached to the attachment 30 can slide relative to the attachment 30 in accordance with the movement of the attachment 30 relative to the base 16. By making the cover and other components slidable relative to the attachment 30, the cover and other components can be prevented from being deformed in accordance with the movement of the attachment 30.

[0054] (Variant 4)

[0055] Figure 5 : is a diagram schematically showing an injection device 10 of a modification 4. In this modification 4, only the front plate 18 is fixed to the base 16 and fixed to the attachment 30. The rear plate 20 may not be fixed to the base 16 and may be separated from the attachment 30. Figure 5 In the illustrated example, the rear plate 20 and the attachment member 30 are separated by a gap GA.

[0056] In this fourth modification, the rear plate 20 can move in a predetermined direction DA away from the front plate 18 in response to the reaction force applied to the rear plate 20. In other words, the rear plate 20 can move without restriction relative to either the base 16 or the attachment 30. Therefore, the front plate 18 and the rear plate 20 can be maintained parallel to each other.

[0057] (Variant 5)

[0058] Figure 6 : is a diagram schematically showing the injection device 10 of the modification 5. In the modification 5, only the rear plate 20 is fixed to the base 16 and fixed to the attachment 30. The front plate 18 is not fixed to the base 16 and is separated from the attachment 30. Figure 6 In the illustrated example, the front plate 18 and the attachment member 30 are separated by a gap GB.

[0059] In this fifth modification, the front plate 18 can move in a predetermined direction DA away from the rear plate 20 in response to the reaction force applied to the rear plate 20. In other words, the front plate 18 can move without restriction relative to either the base 16 or the attachment 30. Therefore, the front plate 18 and the rear plate 20 can be maintained parallel to each other.

[0060] (Variant 6)

[0061] Figure 7 : is a diagram schematically showing the injection device 10 of the modification 6. In the modification 6, only the front plate 18 is fixed to the attachment 30, and only the rear plate 20 is fixed to the base 16. The front plate 18 is not fixed to the base 16, and the rear plate 20 is separated from the attachment 30. Figure 7 In the illustrated example, the rear plate 20 and the attachment member 30 are separated by a gap GA.

[0062] In this sixth variation, the front panel 18 can move relative to the base 16, along with the attachment 30, in a predetermined direction DA, away from the rear panel 20, in response to the reaction force exerted on the rear panel 20. Specifically, the front panel 18 can move relative to the base 16 without restriction, along with the attachment 30. Therefore, the front panel 18 and the rear panel 20 can be maintained parallel. However, components such as a cover attached to the attachment 30 can slide relative to the moving attachment 30.

[0063] Alternatively, only the front plate 18 may be fixed to the base 16 , and only the rear plate 20 may be fixed to the attachment member 30 . In this case, the front plate 18 and the attachment member 30 are separated, and the rear plate 20 is not fixed to the base 16 .

[0064] In response to the reaction force applied to the rear panel 20, the rear panel 20 can move relative to the base 16 in a predetermined direction DA, away from the front panel 18, together with the attachment 30. In other words, the rear panel 20 can move relative to the base 16 without restriction, together with the attachment 30. Therefore, even in this case, the front panel 18 and the rear panel 20 can be maintained parallel.

[0065] (Variant 7)

[0066] The above-mentioned Modifications 1 to 6 may be appropriately combined within a range not in conflict.

[0067] In the above-described embodiment and modified examples, the front plate 18 and the rear plate 20 are kept parallel during injection molding, thereby improving the precision of injection molding and preventing deformation or damage to the accessory parts 30 and the like.

[0068] The following supplementary notes are further disclosed regarding the above-mentioned embodiment and modifications.

[0069] (Note 1)

[0070] The present disclosure is an injection device 10 that injects a molding material supplied into a cylinder 12 into a mold, the injection device 10 comprising: a screw 14 inserted into the cylinder and movable in a predetermined direction DA; a front plate 18 that secures the cylinder; a push plate 24 that presses the screw in the predetermined direction toward the front end of the cylinder into which the molding material is supplied; 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 and rear plates from below; and an accessory member 30 that extends in the predetermined direction and exists at least between the front and rear plates, the predetermined direction being the direction of the screw axis AX, the front plate and the rear plate being fixed to the base so as to be immovable relative to the base at least in the predetermined direction, and the accessory member being immovable relative to the accessory member at least in the predetermined direction.

[0071] (Note 2)

[0072] 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.

[0073] (Note 3)

[0074] The injection device according to Supplementary Note 1, wherein the front plate and the rear plate may be formed integrally.

[0075] (Note 4)

[0076] The injection device according to any one of Supplementary Notes 1 to 3, wherein the other plate of the front plate and the rear plate, which is different from the one plate fixed to the attachment, may support the attachment so as to be movable relative to the attachment in the predetermined direction.

[0077] (Note 5)

[0078] The injection device according to Supplementary Note 4, wherein the other plate may support the accessory component via sliding mechanisms SR2 and SF2.

[0079] (Note 6)

[0080] The injection device according to any one of Supplementary Notes 1 to 3, wherein the other plate of the front plate and the rear plate, which is different from the one plate fixed to the attachment member, may be separate from the attachment member.

[0081] 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 scope of the technical solution and its equivalents. In addition, these embodiments can also be implemented in combination. For example, in the above-mentioned embodiment, 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.

[0082] Explanation of symbols

[0083] 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 for injecting a molding material supplied into a cylinder into a mold, the injection device 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 into 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 at least in the predetermined direction relative to the base. Only one of the front plate and the rear plate is fixed to the attachment member so as to be unable to move at least in the predetermined direction relative to the attachment member.

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

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

4. The injection device according to any one of claims 1 to 3, characterized in that The other plate of the front plate and the rear plate, which is different from the one plate fixed to the attachment, supports the attachment so as to be movable relative to the attachment in the predetermined direction.

5. The injection device according to claim 4, characterized in that The other plate supports the attachment member via a sliding mechanism.

6. The injection device according to any one of claims 1 to 3, characterized in that The other plate of the front plate and the rear plate, which is different from the one plate fixed to the attachment member, is separated from the attachment member.

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