A slider inner hole column sticking prevention plunger needle structure and application method

Abstract

The application relates to a structure of a plunger needle of a plunger and a method, which comprises an insert, a sliding block and an inclined guide column; the sliding block is connected with a plunger needle, and the plunger needle is provided with a plunger sleeve; the front end of the plunger needle exceeds the plunger sleeve, and the outer surface of the exceeding part is formed with a forming step position matched with a BOSS column of a product in cooperation with the front end of the plunger sleeve; the insert is provided with a forming hole matched with the forming step position; the tail end of the plunger needle is provided with a protrusion, the tail end of the plunger sleeve is provided with a movable slot matched with the protrusion, the tail end of the plunger sleeve is connected with a plunger needle, the sliding block is provided with a horizontal through hole corresponding to the plunger needle, and the tail end of the plunger needle penetrates through the sliding block; the outer surface of the plunger sleeve is provided with a step position, and a spring is sleeved on the step position; the plunger needle and the plunger sleeve are combined to form a forming hole structure of a BOSS column, and the plunger needle and the plunger sleeve are provided with a structure of demolding in sequence, so that the structure can be simplified, the demolding and sticking situation can be reduced, and the reliability of demolding can be ensured.

Description

Technical Field

[0001] This invention relates to the field of plastic mold technology, and more specifically, to a sleeve spring pin structure and application method for preventing the inner hole pillar of the slider from sticking to the mold. Background Technology

[0002] In the processing of plastic products, the BOSS pillars on the product are often formed by using a slider to drive the inlaid pillars. Although this structure has a good demolding force, there is a risk of the inlaid pillars sticking to the mold during the demolding stage. Therefore, a sleeve spring pin structure is needed to prevent the inlaid pillars of the slider from sticking to the mold. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a sleeve spring pin structure and application method for preventing the inner hole pin of the slider from sticking to the mold, in view of the above-mentioned defects of the prior art.

[0004] The technical solution adopted by this invention to solve its technical problem is: A sleeve pin structure is constructed to prevent the insert pin inside the slider from sticking to the mold. The structure includes an insert, a slider, and an inclined guide pin that drives the slider. An ejector pin is connected to the slider, and an ejector sleeve is fitted over the ejector pin. The front end of the ejector pin extends beyond the ejector sleeve, and the outer surface of the extended portion forms a molding step with the front end of the ejector sleeve to mate with the BOSS pin of the product. The insert has a molding hole that mates with the molding step and an opening for the ejector sleeve to extend into. A protrusion is provided at the rear end of the ejector pin, and a movable groove that mates with the protrusion is provided at the rear end of the ejector sleeve. When the slider moves, the protrusion drives the ejector pin to move. The ejector pin moves; a spring pin is connected to the tail end of the ejector sleeve, and a transverse through hole corresponding to the spring pin is provided on the slider, through which the tail end of the spring pin passes; a step is provided on the outer surface of the ejector sleeve, and a spring is fitted on the step. After the mold is closed, the spring is in a compressed state. A receiving hole is provided on the insert to accommodate the step and the spring, and the end of the protrusion extends beyond the opening of the receiving hole; a groove is formed in the middle of the inclined surface of the inclined guide post, and the inner wall of the groove includes a straight surface that maintains the holding force on the spring pin when the mold is opened. A pushing inclined surface is formed at the lower end of the inclined surface of the inclined guide post to push the spring pin when the mold is closed.

[0005] The ejector pin structure for preventing the inner hole column of the slider from sticking to the mold according to the present invention includes a limiting protrusion provided on the outer surface of the front end of the ejector pin, and a limiting groove that cooperates with the limiting protrusion is provided at the front opening of the transverse through hole.

[0006] The ejector pin structure for preventing the inner hole column of the slider from sticking to the mold according to the present invention, wherein the movable groove connects the upper and lower surfaces of the ejector sleeve, and the upper and lower ends of the protrusion both extend beyond the movable groove.

[0007] The ejector pin structure for preventing the inner hole column of the slider from sticking to the mold according to the present invention includes a limiting step at the opening of the receiving hole that cooperates with the protrusion.

[0008] The ejector pin structure for preventing the inner hole post of the slider from sticking to the mold according to the present invention, wherein the tail end of the ejector pin is provided with a fixing post, and the fixing post forms the protrusion.

[0009] The ejector pin structure for preventing the inner hole column of the slider from sticking to the mold according to the present invention includes a positioning block formed at the tail end of the ejector pin to prevent the ejector pin from twisting, and a positioning groove formed inside the ejector sleeve for the positioning block to slide, wherein the positioning groove is connected to the movable groove.

[0010] The ejector pin structure for preventing the inner hole column of the slider from sticking to the mold according to the present invention, wherein the movable groove is provided on the end face of the tail end of the ejector sleeve, and the ejector pin closes the opening of the movable groove.

[0011] A method for applying a spring pin structure to prevent the inner hole pillar of the slider from sticking to the mold, wherein the spring pin structure for preventing the inner hole pillar of the slider from sticking to the mold is as described above, and the implementation method is as follows: During the mold closing stage: The inclined guide post moves downward toward the slider, pushing the inclined surface to first contact the spring needle and causing the spring needle to move laterally a certain distance. The inclined guide post continues to move downward toward the slider and contact the slider. The inclined guide post causes the slider to move and fit the insert. The tail end of the spring needle fits the straight surface under the compression of the spring. During the mold-making stage: The inclined guide post moves upward, causing the slider to move, which in turn causes the ejector pin to move. The protrusion moves in the movable groove, and the ejector pin first comes out of the inner hole of the BOSS post. After the spring pin leaves the straight surface, the limit on the spring pin is released. When the protrusion moves to the end of the movable groove, it will drive the ejector sleeve to move synchronously, and the ejector sleeve will disengage from the BOSS post.

[0012] The beneficial effects of this invention are as follows: In the mold closing stage: the inclined guide post moves downward toward the slider, pushing the inclined surface to first contact the spring pin and drive the spring pin to move laterally a certain distance. The inclined guide post continues to move downward toward the slider and contacts the slider. The inclined guide post drives the slider to move and fit the insert. The tail end of the spring pin fits the straight surface under the compression of the spring. In the mold opening stage: the inclined guide post moves upward, driving the slider to move, and then driving the ejector pin to move. The protrusion moves in the movable groove. The ejector pin first comes out of the inner hole of the BOSS pillar. After the spring pin leaves the straight surface, the limit on the spring pin is released. When the protrusion moves to the end of the movable groove, it will drive the ejector sleeve to move synchronously. The ejector sleeve leaves the BOSS pillar. Using the method of this application, the structure is very compact. The ejector pin and ejector sleeve combine to form the molding hole structure of the BOSS pillar. At the same time, the ejector pin and ejector sleeve adopt a sequential demolding structure, which can simplify the structure and reduce the occurrence of demolding sticking, ensuring the reliability of demolding. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or 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 those skilled in the art, other drawings can be obtained based on these drawings without creative effort: Figure 1 This is a preferred embodiment of the present invention, which is a sleeve spring pin structure for preventing the inner hole column of the slider from sticking to the mold. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0015] The preferred embodiment of the present invention provides a sleeve spring pin structure for preventing the inner hole pillar of the slider from sticking to the mold, such as... Figure 1As shown, the device includes an insert 1, a slider 2, and an inclined guide post 3 that drives the slider 2; a ejector pin 4 is connected to the slider 2, and an ejector sleeve 5 is fitted over the ejector pin 4; the front end of the ejector pin 4 extends beyond the ejector sleeve 5, and the outer surface of the extended part forms a molding step 50 with the front end of the ejector sleeve 5 to mate with the BOSS post 6 of the product; the insert 1 is provided with a molding hole 10 that mates with the molding step 50 and an opening 11 for the ejector sleeve to extend into; a protrusion 40 is provided at the tail end of the ejector pin 4, and a movable groove 51 that mates with the protrusion 40 is provided at the tail end of the ejector sleeve 5; when the slider 2 moves, the ejector pin 4 is moved through the protrusion 40; the tail end of the ejector sleeve 5... The end is connected to a spring pin 7, and the slider 2 is provided with a transverse through hole 20 corresponding to the spring pin 7. The tail end of the spring pin 7 passes through the slider 2. The outer surface of the sleeve 5 is provided with a step position 54, and a spring 52 is sleeved on the step position 54. After the mold is closed, the spring 52 is in a compressed state. The insert 1 is provided with a receiving hole 12 to accommodate the step position 54 and the spring 52. The end of the protrusion 40 extends beyond the opening of the receiving hole 12. The middle part of the inclined surface of the inclined guide post 3 is formed with a groove. The inner wall of the groove includes a straight surface 30 that provides pressure to the spring pin 7 when the mold is opened. The lower end of the inclined surface of the inclined guide post 3 is formed with a pushing inclined surface 31 that pushes the spring pin 7 when the mold is closed. During the mold closing stage: the inclined guide post 3 moves downward toward the slider 2, pushing the inclined surface 31 to contact the spring pin 7 first and causing the spring pin 7 to move laterally a certain distance. The inclined guide post 3 continues to move downward toward the slider 2 and contact the slider 2. The inclined guide post 3 causes the slider 2 to move and fit the insert 1. The tail end of the spring pin 7 fits the straight surface under the compression of the spring 52. During the mold opening stage: the inclined guide post 3 moves upward, driving the slider 2 to move, which in turn drives the ejector pin 4 to move. The protrusion 40 moves in the movable groove 51. The ejector pin 4 first comes out of the inner hole of the BOSS post 6. After the spring pin 7 leaves the straight surface, the limit on the spring pin 7 is released. When the protrusion 40 moves to the end of the movable groove 51, it will drive the ejector sleeve 5 to move synchronously. The ejector sleeve 5 leaves the BOSS post 6. The method of this application results in a very compact structure. The ejector pin 4 and ejector sleeve 5 are combined to form the molding hole structure of the BOSS pillar 6. At the same time, the ejector pin 4 and ejector sleeve 5 adopt a sequential demolding structure, which can simplify the structure, reduce the occurrence of demolding sticking, and ensure the reliability of demolding.

[0016] Preferably, a limiting protrusion 70 is provided on the outer surface of the front end of the spring pin 7, and a limiting groove 21 that cooperates with the limiting protrusion 70 is provided at the front opening of the transverse through hole 20; the cooperation between the limiting protrusion 70 and the limiting groove 21 can ensure the stability of the movement of the spring pin 7 while limiting the maximum movement distance of the spring pin 7, and prevent the spring pin 7 from coming out when the mold is opened.

[0017] Preferably, the movable groove 51 connects the upper and lower surfaces of the ejector sleeve 5, and the upper and lower ends of the protrusion 40 extend beyond the movable groove 51; a limiting step 120 that cooperates with the protrusion 40 is provided at the opening of the receiving hole 12; a preferred protrusion forming method can be: a fixing post is provided at the tail end of the ejector pin 4, and the fixing post forms the protrusion 40, or the protrusion can be formed by integral molding; a positioning block 41 is formed at the tail end of the ejector pin 4 to prevent the ejector pin from twisting, and a positioning groove 53 for the positioning block slider is formed inside the ejector sleeve 5, and the positioning groove 53 is connected to the movable groove 51; the positioning block 41 is set to position the ejector pin to prevent it from twisting during injection molding.

[0018] Preferably, the end face of the sleeve 5 is provided with a movable groove 51, and the spring pin 7 closes the opening of the movable groove 51; the structure is simple and easy to form.

[0019] A method for applying a spring-loaded ejector pin structure to prevent the inner hole pillar of the slider from sticking to the mold, wherein the spring-loaded ejector pin structure for preventing the inner hole pillar of the slider from sticking to the mold, as described above, is implemented as follows: During the mold closing stage: The inclined guide post moves downward toward the slider, pushing the inclined surface to first contact the spring needle and causing the spring needle to move laterally a certain distance. The inclined guide post continues to move downward toward the slider and contact the slider. The inclined guide post causes the slider to move and fit the insert. The tail end of the spring needle fits the straight surface under the compression of the spring. During the mold-making stage: The inclined guide post moves upward, causing the slider to move, which in turn causes the ejector pin to move. The protrusion moves in the movable groove, and the ejector pin first comes out of the inner hole of the BOSS post. After the spring pin leaves the straight surface, the limit on the spring pin is released. When the protrusion moves to the end of the movable groove, it will drive the ejector sleeve to move synchronously, and the ejector sleeve will disengage from the BOSS post. The method and approach of this application result in a very compact structure. The ejector pin and ejector sleeve are combined to form the molding hole structure of the BOSS column. At the same time, the ejector pin and ejector sleeve adopt a sequential demolding structure, which can simplify the structure, reduce the occurrence of demolding sticking, and ensure the reliability of demolding.

[0020] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A sleeve spring pin structure for preventing the inner hole pillar of the slider from sticking to the mold, characterized in that, The device includes an insert, a slider, and a guide post for driving the slider. A ejector pin is connected to the slider, and an ejector sleeve is fitted over the ejector pin. The front end of the ejector pin extends beyond the ejector sleeve, and the outer surface of the extended portion forms a molding step with the front end of the ejector sleeve to mate with the product's boss post. The insert has a molding hole that mates with the molding step and an opening for the ejector sleeve to extend into. A protrusion is provided at the tail end of the ejector pin, and a movable groove that mates with the protrusion is provided at the tail end of the ejector sleeve. When the slider moves, the ejector pin moves via the protrusion. A spring pin is connected to the tail end of the ejector sleeve, and a transverse through hole corresponding to the spring pin is provided on the slider. The tail end of the spring pin passes through the slider. A step is provided on the outer surface of the ejector sleeve, and a spring is fitted on the step. After mold closing, the spring is in a compressed state. The insert has a receiving hole to accommodate the step and the spring. The end of the protrusion extends beyond... The receiving hole has an opening; the inclined guide post has a groove formed in the middle of its inclined surface, the inner wall of the groove includes a straight surface that provides pressure to the spring pin when the mold is opened, and the lower end of the inclined guide post has a pushing inclined surface that pushes the spring pin when the mold is closed; a limiting protrusion is provided on the outer surface of the front end of the spring pin, and a limiting groove that cooperates with the limiting protrusion is provided at the front opening of the transverse through hole; the movable groove connects the upper and lower surfaces of the ejector sleeve, and the upper and lower ends of the protrusion both extend beyond the movable groove; a limiting step that cooperates with the protrusion is provided at the opening of the receiving hole; a fixing post is provided at the tail end of the ejector pin, and the fixing post forms the protrusion; a positioning block is formed at the tail end of the ejector pin to prevent the ejector pin from twisting, and a positioning groove for the positioning block to slide is formed inside the ejector sleeve, and the positioning groove is connected to the movable groove; the movable groove is opened on the end face of the tail end of the ejector sleeve, and the spring pin closes the opening of the movable groove.

2. A method for applying a sleeve spring pin structure to prevent the inner hole pillar of a slider from sticking to the mold, wherein the sleeve spring pin structure for preventing the inner hole pillar of a slider from sticking to the mold as described in claim 1 is characterized in that, The implementation method is as follows: During the mold closing stage: The inclined guide post moves downward toward the slider, pushing the inclined surface to first contact the spring needle and causing the spring needle to move laterally a certain distance. The inclined guide post continues to move downward toward the slider and contact the slider. The inclined guide post causes the slider to move and fit the insert. The tail end of the spring needle fits the straight surface under the compression of the spring. During the mold-making stage: The inclined guide post moves upward, causing the slider to move, which in turn causes the ejector pin to move. The protrusion moves in the movable groove, and the ejector pin first comes out of the inner hole of the BOSS post. After the spring pin leaves the straight surface, the limit on the spring pin is released. When the protrusion moves to the end of the movable groove, it will drive the ejector sleeve to move synchronously, and the ejector sleeve will disengage from the BOSS post.

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