A front and back mold ejector pin structure for injection molds

Abstract

The utility model provides a front and back mould ejector pin structure for injection mould, include: front mould fixed plate, backing plate, A board, front mould benevolence, B board, back mould benevolence, cushion block, back mould fixed plate, front ejector pin, front ejector pin board, rear ejector pin board, rear ejector pin, reset ejector pin and spring, the side of the backing plate close to A board is equipped with mounting hole, the side of A board away from B board is equipped with the hole of avoiding position, mounting hole and the hole of avoiding position intercommunication, front ejector pin board movably be equipped in the hole of avoiding position, one end of front ejector pin is fixed in front ejector pin board, the other end passes through A board and front mould benevolence and is set in front mould buckle position, one end of rear ejector pin is fixed in rear ejector pin board, the other end passes through B board and back mould benevolence and is set in back mould buckle position, one end of reset ejector pin is fixed in rear ejector pin board, the other end passes through B board and A board, and before opening mould, the hole bottom of front ejector pin board is separated from the hole of avoiding position to first interval, one end of spring is fixed in mounting hole, the other end is set on front ejector pin board telescopically.

Description

Technical Field

[0001] This utility model belongs to the field of complex mold technology, and in particular relates to a front and rear ejector pin structure for injection molds. Background Technology

[0002] like Figure 1 As shown, a common injection mold generally includes a front mold 80 and a rear mold 90. The front mold 80 includes a front mold fixing plate 81, an A plate 82, and a front mold core 83. The front mold fixing plate 81 and the A plate 82 are fixedly connected. The front mold core 83 is embedded and fixed on the A plate 82 on the side away from the front mold fixing plate 81. The rear mold 90 includes a B plate 91, a rear mold core 92, ejector pins 93, ejector plate 94, a spacer block 95, a rear mold base plate 96, and ejector rollers 97. The rear mold core 92 is embedded on the B plate 91 on the side closer to the A plate 82. The two ends of the spacer block 95 are respectively ejected and fixed between the B plate 91 and the rear mold base plate 96 along the mold opening direction, forming a movement space 98. The rear mold base plate 96 is fixed to the movable side of the injection molding machine. The ejector plate 94 is set in the motion space 98, which can be moved away from or closer to the B plate 91. One end of the ejector pin 93 is fixed in the ejector plate 94, and the other end passes through the B plate 91 and the rear mold core 92 in sequence. One end of the ejector roller 97 is connected to the drive shaft of the injection molding machine, and the other end can slide through the rear mold base plate 96 and be ejected on the ejector plate 94. When the injection molded product is completed, the B plate 91 is driven by the rear mold base plate 96 to gradually move away from the A plate 82 until the mold is opened. The injection molded product left on the rear mold 90 is ejected by the ejector pin 93 along the mold opening direction under the action of the ejector roller 97, and the molded part is obtained.

[0003] However, as Figure 2 As shown, when the injection molded product 101 has both a front mold snap-fit ​​and a rear mold snap-fit, there is a risk that the injection molded product will stick to the front mold during mold opening, thus affecting the injection quality. Therefore, how to prevent the injection molded product from sticking to the front mold during mold opening when the injection molded product has both a front mold snap-fit ​​and a rear mold snap-fit ​​becomes a problem that needs to be solved. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a front and rear mold ejector pin structure for injection molds, which solves the problem of how to prevent the injection molded product from sticking to the front mold during mold opening when the injection molded product has both front mold locking and rear mold locking.

[0005] This utility model provides a front and rear ejector pin structure for injection molds, including: a front mold fixing plate, a backing plate, an A plate, a front mold core, a B plate, a rear mold core, a spacer block, a rear mold fixing plate, a front ejector pin, a front ejector pin plate, a rear ejector pin, a rear ejector pin, a reset ejector pin, and a spring. The front mold fixing plate, the backing plate, and the A plate are sequentially fixedly connected along a first direction. A mounting hole is provided on the side of the backing plate closest to the A plate. The front mold core is disposed within the A plate near the B plate. A clearance hole is provided on the side of the A plate away from the B plate. The mounting hole communicates with the clearance hole. The front ejector pin plate is movably disposed within the clearance hole along the first direction. One end of the front ejector pin is fixed within the front ejector pin plate, and the other end of the front ejector pin passes through the A plate and the front mold core along the first direction and is ejected at the front mold fastener of the injection molded product. The rear mold core is disposed within the B plate near the A plate. The spacer block is provided with... Two ejector plates are fixed at both ends of plate B on the side away from plate A, and each pad is fixed to the rear mold fixing plate to form an ejection space. The rear ejector plate is movable in the ejection space along the first direction. One end of the rear ejector is fixed in the rear ejector plate, and the other end of the rear ejector passes through plate B and the rear mold core along the first direction and is ejected at the rear mold fastener of the injection molded product. One end of the reset ejector is fixed in the rear ejector plate, and the other end of the reset ejector passes through plate B and plate A. Before mold opening, the other end of the reset ejector pushes the front ejector plate away from the bottom of the relief hole to the first distance. It is used to drive the front ejector plate to retract the front ejector into the front mold core to complete the reset when the mold is closed. One end of the spring is fixed in the mounting hole, and the other end of the spring can extend and retract along the first direction and is ejected on the front ejector plate. It is used to push the front ejector plate toward the bottom of the relief hole when the mold is opened.

[0006] Optionally, the reset ejector pin is located on the outside of the front mold core and the rear mold core.

[0007] Optionally, the spring is a nitrogen spring, which includes a cylinder end and a plunger rod end. The cylinder end is fixed in the mounting hole, and the plunger rod end is telescopically mounted on the front ejector plate.

[0008] Preferably, the cylinder block end is fixed in the mounting hole by bolts.

[0009] Optionally, the front ejector plate includes a front ejector panel and a front ejector base plate, with one end of the front ejector pin pressed and fixed inside the front ejector panel by the front ejector base plate.

[0010] Optionally, a gap is left between the front ejector plate and the side wall of the clearance hole.

[0011] Optionally, the rear ejector plate includes a rear ejector panel and a rear ejector base plate. One end of the rear ejector is pressed and fixed inside the rear ejector panel by the rear ejector base plate, and one end of the reset ejector is pressed and fixed inside the rear ejector panel by the rear ejector base plate.

[0012] Optionally, gaps are left between the rear ejector plate and the two pads.

[0013] Optionally, the first spacing is greater than the release stroke of the front mold locking part of the injection molded product.

[0014] Optionally, the front mold fixing plate, the pad plate, and the A plate are detachably fixed together in sequence along the first direction.

[0015] Compared with the prior art, the front and rear mold ejector pin structure for injection molds provided by this utility model is ingeniously designed. It can effectively prevent the injection molded product from sticking to the front mold during mold opening, and greatly improve the efficiency and quality of injection molded products, especially when the injection molded product has both front mold locking and rear mold locking. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a commonly used injection mold.

[0018] Figure 2 This is a schematic diagram of the front and rear ejector pin structure of an injection mold according to an embodiment of the present invention before the front mold locking pin is disengaged.

[0019] Figure 3 This is a schematic diagram of the front and rear ejector pin structure of an injection mold according to an embodiment of the present invention after the front mold locking position is disengaged. Detailed Implementation

[0020] To provide a better understanding of the purpose, structure, features, and functions of this utility model, detailed descriptions are provided below with reference to specific embodiments.

[0021] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Please refer to the reference. Figure 2 and Figure 3As shown, this utility model provides a front and rear mold ejector pin structure 100 for injection molds, including: a front mold fixing plate 1, a pad plate 2, an A plate 3, a front mold core 4, a B plate 5, a rear mold core 6, a pad block 7, a rear mold fixing plate 8, a front ejector pin 9, a front ejector pin plate 10, a rear ejector pin 11, a rear ejector pin plate 12, a reset ejector pin 13, and a spring 14.

[0023] The front mold fixing plate 1, the pad plate 2, and the A plate 3 are fixedly connected in sequence along the first direction X.

[0024] Mounting hole 21 is provided on the side of pad 2 near plate A 3.

[0025] The front mold core 4 is located inside plate A 3 on the side close to plate B 5.

[0026] A clearance hole 31 is provided on the side of plate A 3 away from plate B 5, and mounting hole 21 is connected to clearance hole 31.

[0027] The front ejector plate 10 is movable in the first direction X within the clearance hole 31.

[0028] One end of the front ejector pin 9 is fixed inside the front ejector plate 10, and the other end of the front ejector pin 9 passes through the A plate 3 and the front mold core 4 along the first direction X and is then ejected onto the front mold fastener 201 of the injection molded product 200.

[0029] The rear mold core 6 is located inside plate B 5 on the side close to plate A 3.

[0030] The pad 7 has two ends that are respectively fixed on the side of the B plate 5 away from the A plate 3, and each pad 7 is fixed to the rear mold fixing plate 8 to form an ejection space 78.

[0031] The rear ejector plate 12 is movable along the first direction X in the ejection space 78.

[0032] One end of the rear ejector pin 11 is fixed inside the rear ejector plate 12, and the other end of the rear ejector pin 11 passes through the B plate 5 and the rear mold core 6 along the first direction X and is then ejected onto the rear mold retainer 202 of the injection molded product 200.

[0033] One end of the reset ejector pin 13 is fixed inside the rear ejector plate 12, and the other end of the reset ejector pin 13 passes through plate B 5 and plate A 3. Before the mold opens, the other end of the reset ejector pin 13 pushes the front ejector plate 10 away from the bottom of the relief hole 31 to the first distance L. When the mold closes, it drives the front ejector plate 10 to drive the front ejector pin 9 to retract into the front mold core 4 to complete the reset.

[0034] One end of the spring 14 is fixed in the mounting hole 21, and the other end of the spring 14 can be telescopically mounted on the front ejector plate 10 in the first direction X, so as to push the front ejector plate 10 toward the bottom of the clearance hole 31 when the mold is opened.

[0035] Optionally, the reset ejector pin 13 is located on the outside of the front mold core 4 and the rear mold core 6. This makes it easier to insert the reset ejector pin 13.

[0036] Optionally, spring 14 is a nitrogen spring 14, which includes a cylinder end 141 and a plunger rod end 142. The cylinder end 141 is fixed in the mounting hole 21, and the plunger rod end 142 is telescopically mounted on the front ejector plate 10. Nitrogen spring 14 is used because it is small in size, has high elasticity, long stroke, stable operation, is precisely manufactured, and has a long service life.

[0037] Preferably, the cylinder end 141 is fixed in the mounting hole 21 by bolts 143. This facilitates the disassembly and maintenance of the spring 14.

[0038] Optionally, the front ejector plate 10 includes a front ejector panel 101 and a front ejector base plate 102, with one end of the front ejector 9 pressed and fixed inside the front ejector panel 101 by the front ejector base plate 102. This facilitates the assembly and disassembly of the front ejector 9.

[0039] Optionally, a gap is left between the front ejector plate 10 and the side wall of the clearance hole 31. This facilitates the movement of the front ejector plate 10 within the clearance hole 31 with less resistance.

[0040] Optionally, the rear ejector plate 12 includes a rear ejector panel 121 and a rear ejector base plate 122. One end of the rear ejector 11 is pressed and fixed inside the rear ejector panel 121 by the rear ejector base plate 122, and one end of the reset ejector 13 is pressed and fixed inside the rear ejector panel 121 by the rear ejector base plate 122. This facilitates the assembly and disassembly of the rear ejector 11 and the reset ejector 13.

[0041] Optionally, a gap is left between the rear ejector plate 12 and the two pads 7. This facilitates the movement of the rear ejector plate 12 within the ejection space 78 with less resistance.

[0042] Optionally, the first gap L is greater than the release stroke of the front mold retainer 201 of the injection molded product 200. This can effectively ensure that when the ejector plate 10 moves the first gap and rests against the bottom of the hole in the clearance hole 31, the front mold retainer 201 of the injection molded product 200 has disengaged from the front mold core 4.

[0043] Optionally, the front mold fixing plate 1, the pad plate 2, and the A plate 3 are detachably fixed together in sequence along the first direction X. This facilitates the disassembly and maintenance of the front ejector pin 9 and the spring 14.

[0044] The operating principle of the front and rear ejector pin structure 100 for injection molds of this utility model is as follows: When the mold is opened, the B plate 5, the rear mold core 6, the pad block 7, the rear mold fixing plate 8 and the rear ejector plate 12 start to move away from the A plate 3 along the first direction X. The reset ejector 13 also gradually moves away from the A plate 3. At this time, the compressed spring 14 drives the front ejector plate 10 to approach the bottom of the hole 31 close to the reset ejector 13. This causes the front ejector 9 to push the front mold retainer 201 of the injection molded product 200 away from the front mold core 4 under the action of the front ejector plate 10, effectively preventing the injection molded product 200 from sticking to the front mold core 4.

[0045] When the mold is closed, when the reset ejector pin 13 begins to contact the front ejector plate 10, it drives the front ejector plate 10 to move away from the bottom of the relief hole 31 until it reaches the first gap L, thereby driving the front ejector pin 9 to retract into the front mold core 4 to complete the reset. At this time, the spring 14 is gradually compressed.

[0046] The front and rear ejector pin structure for injection molds provided by this utility model is ingeniously designed. It effectively prevents the injection molded product from sticking to the front mold during mold opening, thus greatly improving the efficiency and quality of the injection molded product, especially when the injection molded product has both front and rear mold fasteners.

[0047] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. Conversely, any modifications and refinements made without departing from the spirit and scope of this utility model are within the scope of patent protection of this utility model.

Claims

1. A front and rear ejector pin structure for an injection mold, the injection mold comprising: The mold comprises a front mold fixing plate, an A plate, a front mold core, a B plate, a rear mold core, a spacer block, a rear mold fixing plate, a rear ejector plate, and a rear ejector pin. The front mold core is disposed within the A plate near the B plate, and the rear mold core is disposed within the B plate near the A plate. The spacer block has two ends respectively fixed to the B plate on the side away from the A plate, and each spacer block is fixed to the rear mold fixing plate to form an ejection space. The rear ejector plate is movably disposed in the ejection space along a first direction. One end of the rear ejector pin is fixed within the rear ejector plate, and the other end of the rear ejector pin passes through the B plate and the rear mold core along the first direction and ejects from the rear mold of the injection molded product. The front and rear mold ejector pin structure includes: a spacer plate, a front ejector plate, a front ejector pin, a reset ejector pin, and a spring. The front mold fixing plate, the pad plate, and the A plate are sequentially fixedly connected along the first direction. The pad plate has a mounting hole on the side close to the A plate, and the A plate has a clearance hole on the side away from the B plate. The mounting hole and the clearance hole are connected. The front ejector plate is movably disposed within the clearance hole along the first direction; One end of the front ejector pin is fixed inside the front ejector pin plate, and the other end of the front ejector pin passes through the A plate and the front mold core along the first direction and is ejected at the front mold snap position of the injection molded product. One end of the reset ejector pin is fixed inside the rear ejector plate, and the other end of the reset ejector pin passes through the B plate and the A plate. Before the mold opens, the other end of the reset ejector pin pushes the front ejector plate away from the bottom of the clearance hole to the first distance. When the mold closes, the front ejector plate drives the front ejector pin to retract into the front mold core to complete the reset. One end of the spring is fixed in the mounting hole, and the other end of the spring can be telescopically pushed against the front ejector plate in the first direction, so as to push the front ejector plate towards the bottom of the clearance hole when the mold is opened.

2. The front and rear ejector pin structure for injection molds as described in claim 1, characterized in that, The reset ejector pin is located on the outside of the front mold core and the rear mold core.

3. The front and rear ejector pin structure for injection molds as described in claim 1, characterized in that, The spring is a nitrogen spring, which includes a cylinder end and a plunger rod end. The cylinder end is fixed in the mounting hole, and the plunger rod end is telescopically mounted on the front ejector plate.

4. The front and rear ejector pin structure for injection molds as described in claim 3, characterized in that, The cylinder block end is fixed in the mounting hole by bolts.

5. The front and rear ejector pin structure for injection molds as described in claim 1, characterized in that, The front ejector plate includes a front ejector panel and a front ejector base plate. One end of the front ejector is pressed and fixed inside the front ejector panel by the front ejector base plate.

6. The front and rear ejector pin structure for injection molds as described in claim 1, characterized in that, There is a gap between the front ejector plate and the side wall of the clearance hole.

7. The front and rear ejector pin structure for injection molds as described in claim 1, characterized in that, The rear ejector plate includes a rear ejector panel and a rear ejector base plate. One end of the rear ejector is pressed and fixed inside the rear ejector panel by the rear ejector base plate, and one end of the reset ejector is pressed and fixed inside the rear ejector panel by the rear ejector base plate.

8. The front and rear ejector pin structure for injection molds as described in claim 1, characterized in that, There are gaps between the rear ejector plate and the two pads.

9. The front and rear ejector pin structure for injection molds as described in claim 1, characterized in that, The first gap is greater than the release stroke of the front mold locking part of the injection molded product.

10. The front and rear ejector pin structure for injection molds as described in claim 1, characterized in that, The front mold fixing plate, the pad, and the A plate are detachably and fixedly connected in sequence along the first direction.

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