Ejector pin pulling-back device and injection molding mechanism with ejector pin pulling-back device

Abstract

The utility model relates to the technical field of mold injection molding, and particularly discloses an ejector pin pullback device and an injection molding mechanism with the ejector pin pullback device. The ejector pin pullback device is arranged on one side of a rear mold plate of the mold and comprises an ejector retainer plate, an ejector base plate, an ejector pin and a pullback piece. The ejector retainer plate and the rear mold plate are oppositely arranged; the ejector base plate and the ejector retainer plate are stacked, a mounting hole is formed in the ejector base plate, and an anti-falling structure is arranged on the inner wall of the bottom of the mounting hole; one end of the ejector pin abuts against the side face of the ejector base plate, and the other end of the ejector pin penetrates through the ejector retainer plate and penetrates into a cavity of the mold from the rear mold plate to abut against a product. A limiting structure is arranged at one end of the pullback piece, penetrates into the mounting hole from the top of the mounting hole and moves to the bottom of the mounting hole, and the limiting structure is connected between the ejector retainer plate and the anti-falling structure in an abutting mode. The scheme is simple to install and does not depend on external auxiliary equipment, and the mold installation period is shortened; the number of workpieces is small, manufacturing is easy, and cost is low; connection is firm, pull-back performance is reliable, and maintenance is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of mold injection, in particular to an ejector pin pulling back device and an injection molding mechanism with the same. Background Art

[0002] Injection molding is a processing method used in mass production of certain parts with complex shapes. The specific principle is that the heated and melted plastic raw materials are pushed by the injection molding machine screw and injected into the mold cavity of the plastic mold under high pressure. After cooling and solidification, the plastic molded product is obtained.

[0003] The plastic mold consists of two parts: the movable mold and the fixed mold. The movable mold is installed on the movable mold plate of the injection molding machine, and the fixed mold is installed on the fixed mold plate of the injection molding machine. During injection molding, the movable mold and the fixed mold are closed to form a pouring system and a cavity. When the mold is opened, the movable mold and the fixed mold are separated to take out the plastic product.

[0004] During the injection molding process, when the mold cavity is filled with glue and begins to demold, the mold pusher plate behind the mold pushes the ejector pin to the preset position, and the mold ejector pin pushes the product out to separate the product from the mold.

[0005] However, the ejector pin must be fully retracted when the mold is closed, and the ejector plate needs to have a pull-back structure. Currently, the pull-back structure is complicated to install, which prolongs the mold installation time and reduces production efficiency. Utility Model Content

[0006] In view of this, the utility model provides an ejector pin pulling back structure and a mold having the same, so as to solve the problems that the existing pulling back structure is complicated to install, prolongs the mold installation time, and reduces the production efficiency.

[0007] In the first aspect, the utility model provides an ejector pin retracting device, which is arranged on one side of the rear template of the mold, and includes a face pin plate, a bottom pin plate, an ejector pin and a retracting member. The face pin plate is arranged opposite to the rear template; the bottom pin plate and the face pin plate are arranged in a stacked manner, the bottom pin plate is provided with a mounting hole, and the bottom inner wall of the mounting hole has an anti-slip structure; one end of the ejector pin abuts against the side of the bottom pin plate, and the other end passes through the face pin plate and penetrates from the rear template into the mold cavity to abut against the product; one end of the retracting member has a limiting structure, which penetrates from the top of the mounting hole and moves to the bottom of the mounting hole, and the limiting structure abuts between the face pin plate and the anti-slip structure.

[0008] In an optional embodiment, the ejector pin pulling back device further comprises a bottom plate, the bottom plate and the bottom needle plate are stacked, the bottom plate is provided with an avoidance hole, and the other end of the pulling back member is provided with the avoidance hole.

[0009] In an optional implementation, the avoidance hole is consistent in size with the mounting hole.

[0010] In an optional embodiment, the ejector pin pulling back device further includes an ejector rod of an injection molding machine, and the ejector rod of the injection molding machine is detachably connected to the other end of the pulling back member.

[0011] In an optional embodiment, the ejector pin pulling back device further includes a rear plate of the injection molding machine, which is stacked with the bottom plate, and the rear plate of the injection molding machine is provided with a guide hole, and the ejector pin of the injection molding machine is penetrated with the guide hole.

[0012] In an optional embodiment, the guide hole and the bottom area of ​​the mounting hole are consistent in size.

[0013] In an optional embodiment, the bottom plate has a guide column, which passes through the bottom needle plate, the surface needle plate and the rear template in sequence, and the bottom needle plate and the surface needle plate approach or move away from the rear template along the guide column.

[0014] In an optional embodiment, the ejector pin pulling back device further includes a partition plate, which is abutted between the rear template and the bottom plate.

[0015] In an optional embodiment, the anti-slip structure includes a non-return flange, and the limiting structure includes an annular protrusion, and the annular protrusion abuts between the face needle plate and the non-return flange.

[0016] In a second aspect, the utility model further provides an injection molding mechanism, including a mold and the ejector pin pulling device in the first aspect, a hanging ring is provided on the top of the mold, and the ejector pin pulling device is provided on one side of the rear template of the mold.

[0017] Beneficial effects:

[0018] In the first aspect, the ejector pin pulling back device is provided with an anti-slip structure at the bottom of the mounting hole of the bottom needle plate. The limiting structure of the pulling back member is first inserted from the top of the mounting hole, and then the bottom needle plate is moved upward or the pulling back member is moved downward, so that the limiting structure of the pulling back member is abutted between the surface needle plate and the anti-slip structure. The installation is simple, does not rely on external auxiliary equipment, and shortens the mold installation cycle. Moreover, this solution has fewer workpieces, simple manufacturing, and low cost. In addition, this solution has a firm connection, reliable pulling back performance, and simple maintenance.

[0019] The injection molding mechanism of the second aspect includes the ejector pin pulling back device of the first aspect, so the injection molding mechanism of the second aspect has all the beneficial effects of the ejector pin pulling back device of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is the structural schematic diagram of the injection molding mechanism before improvement;

[0022] Figure 2 It is a structural schematic diagram of the injection molding mechanism described in an embodiment of the utility model.

[0023] Description of reference numerals:

[0024] 1. Face needle plate; 2. Bottom needle plate; 201. Mounting hole; 202. Anti-slip structure; 3. Ejector; 4. Pull-back piece; 401. Limiting structure; 5. Bottom plate; 501. Avoidance hole; 502. Guide column; 6. Ejector rod of injection molding machine; 7. Back plate of injection molding machine; 701. Guide hole; 8. Partition plate; 9. Back template; 10. Back mold core; 11. Product; 12. Sliding position; 13. Lifting ring. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0026] In order to deepen the understanding of the solution of the utility model, it is necessary to elaborate on the technical problems in detail in combination with relevant technologies. The specific contents are as follows:

[0027] Injection molding is a processing method used in mass production of certain parts with complex shapes. The specific principle is that the heated and melted plastic raw materials are pushed by the injection molding machine screw and injected into the mold cavity of the plastic mold under high pressure. After cooling and solidification, the plastic molded product is obtained.

[0028] The plastic mold consists of two parts: the movable mold and the fixed mold. The movable mold is installed on the movable mold plate of the injection molding machine, and the fixed mold is installed on the fixed mold plate of the injection molding machine. During injection molding, the movable mold and the fixed mold are closed to form a pouring system and a cavity. When the mold is opened, the movable mold and the fixed mold are separated to take out the plastic product.

[0029] During the injection molding process, when the mold cavity is filled with glue and begins to demold, the mold pusher plate behind the mold pushes the ejector pin to the preset position, and the mold ejector pin pushes the product out to separate the product from the mold.

[0030] However, the ejector pin must be fully retracted when the mold is closed, and the ejector plate needs to have a pull-back structure. Currently, the pull-back structure is complicated to install, which prolongs the mold installation time and reduces production efficiency.

[0031] Further, referring to the figure, the pull-back part is first installed on the bottom needle plate, and then the bottom needle plate and the surface needle plate are fixed together. In this way, the entire pull-back structure is first fixed and installed in the mold. Then the injection molding machine top rod is screwed into the pull-back structure first, and after screwing, the other end of the injection molding machine top rod is screwed into the injection molding machine. Because both sides have to be screwed in, both sides must be aligned, and the mold has a thousand pounds on this side, and it is difficult to align when the crane moves, so each installation is very difficult, which complicates the mold installation and prolongs the mold installation time.

[0032] In order to alleviate the above technical problems, the utility model provides a ejector pin retracting device and an injection molding mechanism having the same. Figure 2 The embodiments of the present utility model are described in detail.

[0033] First, refer to Figure 2 The utility model provides an ejector pin retracting device, which is arranged on one side of the rear template 9 of the mold, and includes a face pin plate 1, a bottom pin plate 2, an ejector pin 3 and a retracting member 4. The face pin plate 1 is arranged opposite to the rear template 9; the bottom pin plate 2 is arranged in a stacked manner with the face pin plate 1, the bottom pin plate 2 is provided with a mounting hole 201, and the bottom inner wall of the mounting hole 201 has an anti-slip structure 202; one end of the ejector pin 3 abuts against the side of the bottom pin plate 2, and the other end passes through the face pin plate 1 and penetrates into the mold cavity of the mold from the rear template 9 to abut against the product 11; one end of the retracting member 4 has a limiting structure 401, which penetrates from the top of the mounting hole 201 and moves to the bottom of the mounting hole 201, and the limiting structure 401 abuts between the face pin plate 1 and the anti-slip structure 202.

[0034] Specifically, the ejector pin pulling back device is implemented by setting an anti-slip structure 202 at the bottom of the mounting hole 201 of the bottom needle plate 2, and the limiting structure 401 of the pulling back member 4 is first inserted from the top of the mounting hole 201, and then the bottom needle plate 2 is moved upward or the pulling back member 4 is moved downward, so that the limiting structure 401 of the pulling back member 4 is abutted between the surface needle plate 1 and the anti-slip structure 202. The installation is simple, does not rely on external auxiliary equipment, and shortens the mold installation cycle. Moreover, the present solution has fewer workpieces, simple manufacturing, and low cost. In addition, the present solution has a firm connection, reliable pulling back performance, and simple maintenance.

[0035] More specifically, the rear template 9 of the mold is connected to the rear mold core 10, and a cavity is formed between the rear mold core 10 and the front mold core of the front template. The product 11 is formed by injection molding in the cavity, and the ejector pin 3 penetrates into the cavity to eject the product 11 from the rear mold core 10; in addition, a slide 12 is provided above the cavity. When demolding, the slide 12 moves up to separate from the product 11, making it convenient for the ejector pin 3 to eject the product 11.

[0036] In some embodiments, reference Figure 2The ejector pin pulling device further comprises a bottom plate 5, which is stacked with the bottom needle plate 2, and the bottom plate 5 is provided with an avoidance hole 501, and the other end of the pulling member 4 is provided with the avoidance hole 501.

[0037] Specifically, the bottom plate 5 is suitable for limiting the movement of the bottom needle plate 2 .

[0038] In some embodiments, reference Figure 2 , the avoidance hole 501 is consistent in size with the mounting hole 201 .

[0039] Specifically, the pulling member 4 passes through the avoidance hole 501 and the mounting hole 201 in sequence, and then moves downward, and the limiting structure 401 of the pulling member 4 moves to between the anti-slip structure 202 of the mounting hole 201 and the needle plate 1, and there is no interference with the avoidance hole 501 throughout the process.

[0040] In some embodiments, reference Figure 2 The ejector pin pulling device further comprises an injection molding machine ejector rod 6, and the injection molding machine ejector rod 6 is detachably connected to the other end of the pulling member 4.

[0041] Specifically, the injection molding machine push rod 6 is screwed to the pull-back member 4, and the other end of the injection molding machine push rod 6 is connected to the injection molding machine. The corresponding mechanism of the injection molding machine drives the injection molding machine push rod 6 to move back, and then drives the pull-back member 4 to move back. The pull-back member 4 pulls the surface needle plate 1 and the bottom needle plate 2 away from the rear template 9, thereby allowing the ejector pin 3 to exit the mold cavity.

[0042] In some embodiments, reference Figure 2 The ejector pin pulling device further comprises an injection molding machine rear plate 7, which is stacked with the bottom plate 5, and the injection molding machine rear plate 7 is provided with a guide hole 701, and the injection molding machine ejector rod 6 is provided with the guide hole 701.

[0043] Specifically, the injection molding machine rear plate 7 is connected to the injection molding machine, and the injection molding machine rear plate 7 guides the movement of the injection molding machine ejector rod 6 through the guide hole 701 to prevent the movement from being offset.

[0044] In some embodiments, reference Figure 2 The guide hole 701 is consistent in size with the bottom area of ​​the mounting hole 201 .

[0045] Specifically, the diameter of the guide hole 701 is smaller than the diameters of the mounting hole 201 and the avoidance hole 501 , and the guide hole 701 is only slightly larger than the diameter of the injection molding machine ejector rod 6 , thereby better limiting the injection molding machine ejector rod 6 .

[0046] In some embodiments, reference Figure 2 The bottom plate 5 has a guide column 502 , and the guide column 502 passes through the bottom needle plate 2 , the surface needle plate 1 and the rear template 9 in sequence. The bottom needle plate 2 and the surface needle plate 1 approach or move away from the rear template 9 along the guide column 502 .

[0047] Specifically, the guide column 502 in this solution provides a guide for the movement of the surface needle plate 1 and the bottom needle plate 2 to avoid deviation caused by movement and thus causing the ejector pins 3 to bend.

[0048] In some embodiments, reference Figure 2 The ejector pin pulling device further includes a partition plate 8 , which is abutted between the rear template 9 and the bottom plate 5 .

[0049] Specifically, the partition 8 in the present scheme supports the rear template 9 and the bottom plate 5, so that a gap is formed between the rear template 9 and the bottom plate 5, and the face needle plate 1 and the bottom needle plate 2 move in the gap; when the bottom needle plate 2 moves toward the rear template 9, the ejector 3 extends toward the product 11, which is used to eject the product 11 after the injection molding of the product 11 is completed, so that the product 11 is separated from the rear mold core 10; when the pull-back member 4 drives the bottom needle plate 2 to move away from the rear template 9, it drives the ejector 3 to retract, which is convenient for the next injection molding of the product 11.

[0050] In some embodiments, reference Figure 2 The anti-slip structure 202 includes a non-return flange, and the limiting structure 401 includes an annular protrusion, which abuts between the needle plate 1 and the non-return flange.

[0051] Specifically, this solution is a specific connection method between the anti-slip structure 202 of the bottom needle plate 2 and the limiting structure 401 of the pulling back member 4, which has a simple structure and a firm connection.

[0052] Secondly, refer to Figure 2 The utility model also provides an injection molding mechanism, including a mold and an ejector pin pulling device. A hanging ring 13 is provided on the top of the mold, and the ejector pin pulling device is provided on one side of a rear mold plate 9 of the mold.

[0053] Specifically, the injection molding mechanism in this solution includes an ejector pin retracting device, so the injection molding mechanism in this solution has all the beneficial effects of the ejector pin retracting device. In addition, the injection molding mechanism in this solution also includes other components, and only the components related to this solution are listed here, but it does not limit the composition of the injection molding mechanism.

[0054] More specifically, the injection molding machine top rod 6 is first connected to the injection molding machine, and then the injection molding machine top rod 6 is inserted into the injection molding machine rear plate 7 and connected to the pull-back member 4; the lifting device is used to hook the lifting ring 13 to lift the mold; the limiting structure 401 of the pull-back member 4 is successively inserted into the avoidance hole 501 of the bottom plate 5 and the mounting hole 201 of the bottom needle plate 2; then the lifting device is used to move the mold upward, so that the limiting structure 401 of the pull-back member 4 moves to the anti-slip structure 202 of the avoidance hole 501, and abuts against the surface needle plate 1 and the anti-slip structure 202.

[0055] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An ejector pin retracting device, arranged on one side of the rear mold plate (9) of the mold, It is characterized in that include: A face needle plate (1) is arranged opposite to the rear template (9); A bottom needle plate (2) is stacked with the surface needle plate (1), the bottom needle plate (2) is provided with a mounting hole (201), and the bottom inner wall of the mounting hole (201) has an anti-slip structure (202); An ejector pin (3), one end of which abuts against the side surface of the bottom needle plate (2), and the other end of which penetrates the surface needle plate (1) and penetrates from the rear mold plate (9) into the mold cavity of the mold to abut against the product (11); The pulling back member (4) has a limiting structure (401) at one end, and the limiting structure (401) penetrates from the top of the mounting hole (201) and moves to the bottom of the mounting hole (201), and the limiting structure (401) abuts between the needle plate (1) and the anti-slip structure (202).

2. The ejector pin retracting device according to claim 1, It is characterized in that The ejector pin retracting device further comprises a bottom plate (5), the bottom plate (5) being stacked with the bottom needle plate (2), the bottom plate (5) being provided with an avoidance hole (501), and the other end of the retracting member (4) being provided with the avoidance hole (501).

3. The ejector pin retracting device according to claim 2, It is characterized in that The avoidance hole (501) is consistent in size with the mounting hole (201).

4. The ejector pin retracting device according to claim 3, It is characterized in that The ejector pin pulling back device also includes an injection molding machine ejector rod (6), and the injection molding machine ejector rod (6) is detachably connected to the other end of the pulling back member (4).

5. The ejector pin retracting device according to claim 4, It is characterized in that The ejector pin retracting device further comprises an injection molding machine rear plate (7), wherein the injection molding machine rear plate (7) is stacked with the bottom plate (5), the injection molding machine rear plate (7) is provided with a guide hole (701), and the injection molding machine ejector pin (6) is penetrated by the guide hole (701).

6. The ejector pin retracting device according to claim 5, It is characterized in that The guide hole (701) and the bottom area of ​​the mounting hole (201) are of the same size.

7. The ejector pin retracting device according to claim 2, It is characterized in that The bottom plate (5) has a guide column (502), and the guide column (502) passes through the bottom needle plate (2), the surface needle plate (1) and the rear template (9) in sequence. The bottom needle plate (2) and the surface needle plate (1) approach or move away from the rear template (9) along the guide column (502).

8. The ejector pin retracting device according to claim 2, It is characterized in that The ejector pin retracting device further comprises a partition plate (8), wherein the partition plate (8) is abutted between the rear template (9) and the bottom plate (5).

9. The ejector pin retracting device according to any one of claims 1 to 8, It is characterized in that The anti-slip structure (202) comprises a non-return flange, and the limiting structure (401) comprises an annular protrusion, wherein the annular protrusion abuts between the face needle plate (1) and the non-return flange.

10. An injection molding mechanism, It is characterized in that It comprises a mold and the ejector pin pulling back device according to any one of claims 1 to 9, wherein a hanging ring (13) is provided on the top of the mold, and the ejector pin pulling back device is arranged on one side of the rear template (9) of the mold.

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