Elastic needle structure for improving front mold adhesion of three-plate mold and injection mold

Abstract

The utility model relates to an elastic needle structure for improving the front mold adhesion of a three-plate mold. The elastic needle structure comprises a panel, a stripper plate, a plate A and a plate B which are arranged in sequence, a front mold core is arranged on the plate A, and a rear mold core matched with the front mold core is arranged on the plate B; a drawing needle and a first spring for providing upward reset elastic force for the drawing needle are longitudinally and movably arranged in the plate A, and a pressing needle for downwards extruding the drawing needle is arranged on the stripper plate; the plate A is further provided with a movable sleeve and a movable hole matched with the movable sleeve, the first spring is arranged in the movable sleeve, the lower end of the first spring is fixedly connected with the movable sleeve, a second spring providing downward elastic acting force for the pressing needle is arranged in the movable sleeve, and the upper end of the second spring is fixedly connected with the inner top of the movable sleeve. The lower end of the pressing needle and the upper end of the drawing needle extend into the movable sleeve; by applying the popping needle structure, a double-spring structural form is adopted, the purpose of upward pulling of the pulling needle can be guaranteed, and the reliability of the elastic pulling needle is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, and more specifically to an elastic needle structure and an injection mold for improving the adhesion of a three-plate mold to a front mold. Background Art

[0002] Injection mold is a commonly used plastic product processing mold. For some plastic products that require core pulling processing on the upper surface, it is usually necessary to design a separate power or a bevel to assist in core pulling. China application, application number CN201821709869.3 A front mold needle-first pulling structure provides a structure that relies on a spring to pull the core. Although it can solve the above problems, since the action is located inside the mold and is not visible, and the reliability of the spring itself is relatively poor, if the spring is stuck or the elastic force is insufficient, resulting in a core pulling failure, the core pulling cannot be completed, resulting in a defective product. A more reliable elastic needle structure to improve the three-plate mold bonding front mold is needed. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a spring pin structure for improving the front mold bonding of a three-plate mold in view of the above-mentioned defects of the prior art, and also provide an injection mold.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A spring pin structure for improving the front mold adhesion of a three-plate mold is constructed, wherein the structure comprises a face plate, a nozzle plate, an A plate and a B plate which are arranged in sequence; the A plate is provided with a front mold core, and the B plate is provided with a rear mold core which cooperates with the front mold core; a pull-out pin and a first spring which provides an upward reset elastic force for the pull-out pin are longitudinally movably arranged in the A plate, and a pressing pin which presses the pull-out pin downward is arranged on the nozzle plate; a movable sleeve and a movable hole which cooperates with the movable sleeve are also arranged on the A plate, the first spring is arranged in the movable sleeve and the lower end of the first spring is fixedly connected to the movable sleeve, a second spring which provides a downward elastic force for the pressing pin is arranged in the movable sleeve, the upper end of the second spring is fixedly connected to the inner top of the movable sleeve, and the lower end of the pressing pin and the upper end of the pull-out pin both extend into the movable sleeve.

[0006] The utility model provides an improved spring pin structure for bonding the front mold of the three-plate mold, wherein the upper surface of the A plate is provided with an opening for the pressing pin to penetrate, the size of the opening matches the size of the pressing pin, and the opening is connected to the movable hole.

[0007] The utility model discloses an elastic needle structure for improving the front mold bonding of a three-plate mold, wherein an extrusion head for extruding the extraction needle is arranged at the lower end of the pressing needle, and the outer diameter of the extrusion head is larger than the outer diameter of the pressing needle.

[0008] The utility model provides an elastic needle structure for improving the bonding of a three-plate mold to a front mold, wherein the upper end of the extraction needle is provided with a head that cooperates with the extrusion head, and the outer diameter of the head is larger than the outer diameter of the extraction needle.

[0009] The utility model provides an elastic needle structure for improving the bonding of a three-plate mold to a front mold, wherein the first spring is sleeved on the extraction needle, and the inner diameter of the first spring is smaller than the outer diameter of the head.

[0010] The utility model discloses an elastic needle structure for improving the bonding of a three-plate mold to a front mold, wherein the second spring is sleeved on the pressing needle, and the inner diameter of the second spring is smaller than the outer diameter of the extrusion head.

[0011] The utility model provides an improved spring pin structure for bonding the front mold of the three-plate mold, wherein the lower end of the extraction pin is provided with an inserting pin, the outer diameter of the inserting pin is smaller than the outer diameter of the extraction pin, and the front mold core is provided with a limiting hole for limiting the extraction pin and a pin inserting hole cooperating with the inserting pin, and the limiting hole is connected to the movable hole and the pin inserting hole.

[0012] An injection mold, wherein the injection mold is provided with the elastic pin structure as described above for improving the adhesion of the three-plate mold to the front mold.

[0013] The beneficial effect of the utility model is that the elastic needle structure of the present application is applied, and a double-spring structure is adopted. When the mold is closed, the nozzle plate and the A plate are fitted together, and the pressure needle presses against the extraction needle to prevent it from moving, thereby ensuring smooth injection molding. When the mold is opened, the nozzle plate and the A plate are separated first, and the pressure needle moves upward to release the pressure on the extraction needle. At the same time, the upward force of the pressure needle will give the movable sleeve an upward force through the second spring, and finally drive the movable sleeve upward. The first spring will give the extraction needle an upward force to make the extraction needle move upward. Even if the elasticity of the first spring is weakened or stuck, the purpose of pulling up the extraction needle can still be guaranteed, thereby ensuring the reliability of the elastic extraction needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0015] Figure 1 It is a schematic diagram of the elastic pin structure of improving the front mold of the three-plate mold bonding according to a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the following will be combined with the technical solution in the embodiments of the utility model for a clear and complete description. Obviously, the described embodiments are partial embodiments of the utility model, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] The preferred embodiment of the utility model improves the elastic needle structure of the three-plate die bonding front die, such as Figure 1 As shown, it includes a panel 1, a nozzle plate 2, an A plate 3 and a B plate which are arranged in sequence; a front mold core 4 is arranged on the A plate 3, and a rear mold core which cooperates with the front mold core is arranged on the B plate; a pull-out needle 5 and a first spring 6 which provides an upward return elastic force to the pull-out needle 5 are longitudinally movably arranged in the A plate 3, and a pressing needle 7 which presses the pull-out needle downward is arranged on the nozzle plate 2; a movable sleeve 30 and a movable hole 31 which cooperates with the movable sleeve are also arranged on the A plate 3, the first spring 6 is arranged in the movable sleeve 30 and the lower end of the first spring 6 is fixedly connected to the movable sleeve 30, a second spring 8 which provides a downward elastic force for the pressing needle 7 is arranged in the movable sleeve 30, the upper end of the second spring 8 is fixedly connected to the inner top of the movable sleeve 30, and the lower end of the pressing needle 7 and the upper end of the pull-out needle 5 both extend into the movable sleeve 30;

[0018] The elastic needle structure of the present application adopts a double-spring structure. When the mold is closed, the nozzle plate 2 and the A plate 3 are fitted together, and the pressing needle 7 presses against the extraction needle 5 to prevent it from moving, thereby ensuring smooth injection molding. When the mold is opened, the nozzle plate 2 and the A plate 3 are separated first, and the pressing needle 7 moves upward to release the pressure on the extraction needle 5. At the same time, the upward force of the pressing needle 7 will give the movable sleeve 30 an upward force through the second spring 8, and finally drive the movable sleeve 30 upward. The first spring 6 will give the extraction needle 5 an upward force to make the extraction needle 5 move upward. Even if the elasticity of the first spring is weakened or stuck, the purpose of pulling up the extraction needle 5 can still be guaranteed, thereby ensuring the reliability of the elastic extraction needle.

[0019] Preferably, the upper surface of the A plate 3 is provided with an opening 32 for the pressing needle to penetrate, the size of the opening 32 matches the size of the pressing needle 7, and the opening 32 is communicated with the movable hole 31; the lower end of the pressing needle 7 is provided with an extrusion head 70 for squeezing and extracting the needle, and the outer diameter of the extrusion head 70 is larger than the outer diameter of the pressing needle; the structure is reasonable and compact, and can well limit the upward position of the movable sleeve 30.

[0020] Preferably, the upper end of the extraction needle 5 is provided with a head 50 that cooperates with the extrusion head 70, and the outer diameter of the head 50 is larger than the outer diameter of the extraction needle; the first spring 6 is sleeved on the extraction needle, and the inner diameter of the first spring 6 is smaller than the outer diameter of the head 50; the structural design is simple and has good integrity. The first spring is arranged inside the movable sleeve, which can effectively isolate external interference and ensure the reliability of operation.

[0021] Preferably, the second spring 8 is sleeved on the pressure needle 7, and the inner diameter of the second spring 8 is smaller than the outer diameter of the extrusion head 70; similarly, the second spring 8 is arranged inside the movable sleeve, which can effectively isolate external interference and ensure the reliability of operation.

[0022] Preferably, a needle inserting pin 9 is provided at the lower end of the extraction needle 5, and the outer diameter of the needle inserting pin 9 is smaller than the outer diameter of the extraction needle 5. A limiting hole 40 for limiting the extraction needle and a needle inserting hole 41 cooperating with the needle inserting pin are provided on the front mold core 4. The limiting hole 40 connects the movable hole 31 and the needle inserting hole 41. The structure is simple, the operation reliability is good, and it is easy to assemble.

[0023] An injection mold, wherein the injection mold is provided with the elastic pin structure as described above for improving the adhesion of the three-plate mold to the front mold.

[0024] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to the utility model.

Claims

1. A spring pin structure for improving the bonding of a three-plate mold to a front mold, characterized in that: It includes a panel, a nozzle plate, an A plate and a B plate which are arranged in sequence; the A plate is provided with a front mold core, and the B plate is provided with a rear mold core which cooperates with the front mold core; a pull-out needle and a first spring which provides an upward reset elastic force for the pull-out needle are longitudinally movably arranged in the A plate, and a pressing needle which presses the pull-out needle downward is arranged on the nozzle plate; a movable sleeve and a movable hole which cooperates with the movable sleeve are also arranged on the A plate, the first spring is arranged in the movable sleeve and the lower end of the first spring is fixedly connected to the movable sleeve, a second spring which provides a downward elastic force for the pressing needle is arranged in the movable sleeve, the upper end of the second spring is fixedly connected to the inner top of the movable sleeve, the lower end of the pressing needle and the upper end of the pull-out needle both extend into the movable sleeve.

2. The elastic pin structure for improving the front mold bonding of three-plate molds according to claim 1 is characterized in that: An opening for the pressing needle to penetrate is arranged on the upper surface of the A plate, the size of the opening matches the size of the pressing needle, and the opening is communicated with the movable hole.

3. The elastic pin structure for improving the front mold bonding of three-plate molds according to claim 2 is characterized in that: An extrusion head for extruding the extraction needle is arranged at the lower end of the pressing needle, and the outer diameter of the extrusion head is larger than the outer diameter of the pressing needle.

4. The elastic pin structure for improving the front mold bonding of three-plate molds according to claim 3 is characterized in that: The upper end of the extraction needle is provided with a head portion matched with the extrusion head, and the outer diameter of the head portion is larger than the outer diameter of the extraction needle.

5. The elastic pin structure for improving the front mold bonding of three-plate molds according to claim 4 is characterized in that: The first spring is sleeved on the withdrawal needle, and the inner diameter of the first spring is smaller than the outer diameter of the head.

6. The elastic pin structure for improving the front mold bonding of three-plate molds according to claim 3 is characterized in that: The second spring is sleeved on the pressing needle, and the inner diameter of the second spring is smaller than the outer diameter of the extrusion head.

7. The elastic pin structure for improving the front mold bonding of three-plate molds according to any one of claims 1 to 6, characterized in that: A setting pin is arranged at the lower end of the extraction pin, and the outer diameter of the setting pin is smaller than the outer diameter of the extraction pin. A limiting hole for limiting the extraction pin and a pin setting hole cooperating with the setting pin are arranged on the front mold core, and the limiting hole connects the movable hole and the pin setting hole.

8. An injection mold, characterized in that: The injection mold is provided with a spring pin structure for improving the three-plate mold bonding front mold as described in any one of claims 1-7.

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