Anti-rotation structure of ejector pin of injection mold

Abstract

The utility model discloses an anti-rotation structure of an injection mold ejector pin, and relates to the field of injection molds, the anti-rotation structure comprises an ejector pin and a mounting seat coaxially sleeving the outer side of the ejector pin, a first mounting groove is formed in the mounting seat, the ejector pin is fixed in the first mounting groove, and the ejector pin and the first mounting groove are arranged in a clearance fit mode; a positioning mechanism for fixing the ejector pin is arranged on the outer side of the mounting seat and comprises a positioning rod integrally formed on the outer side of the mounting seat, a positioning seat arranged at one end, far away from the mounting seat, of the positioning rod, and a positioning groove formed in the positioning seat; the side, extending into the positioning groove, of the positioning rod is attached to the inner wall of the positioning groove. The problem that when a mold with the high precision requirement is produced, the overall precision and the appearance quality of the mold can be affected by tiny rotation of the ejector pin is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of injection molds, in particular to an anti-rotation structure of an injection mold ejector pin. BACKGROUND

[0002] Injection molds are widely used in the production process of plastic products, and an ejector pin in the injection mold pushes the molded product out of the mold cavity through an ejection action, so that demolding is achieved. However, when the surface of the product is not a flat surface, the rotation of the ejector pin will cause uneven stress, thereby causing the product to deform or be damaged. Therefore, it is necessary to ensure the stability of the ejector pin during the working process and prevent the rotation of the ejector pin.

[0003] In the existing design of injection molds, in order to prevent the rotation of the ejector pin, a method of performing edge cutting on the boss at the lower end of the ejector pin is adopted, and a mounting groove is formed on the mold plate, and the shape of the inner wall of the mounting groove is matched with the shape of the outer wall of the boss. This method can effectively prevent the rotation of the ejector pin. However, in order to facilitate the installation of the ejector pin, the installation between the boss and the mounting groove is arranged in a clearance fit, which will cause the boss to rotate slightly in the circumferential direction in the mounting groove, thereby causing the ejector pin to be unstable during the ejection process. In the production of molds with high precision requirements, the slight rotation of the ejector pin will affect the overall precision and appearance quality of the mold. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the problem that the slight rotation of the ejector pin will affect the overall precision and appearance quality of the mold when producing molds with high precision requirements, the application provides an anti-rotation structure of an injection mold ejector pin.

[0005] The anti-rotation structure of the injection mold ejector pin provided by the application adopts the following technical scheme:

[0006] An anti-rotation structure of an injection mold ejector pin, comprising an ejector pin, a mounting seat coaxially sleeved outside the ejector pin, a first mounting groove is formed on the mounting seat, the ejector pin is fixed in the first mounting groove, the ejector pin and the first mounting groove are arranged in a clearance fit, a positioning mechanism for fixing the ejector pin is arranged on the outside of the mounting seat, the positioning mechanism comprises a positioning rod integrally formed on the outside of the mounting seat, a positioning seat arranged at the end of the positioning rod away from the mounting seat, and a positioning groove formed on the positioning seat, and the side of the positioning rod extending into the positioning groove is matched with the inner wall of the positioning groove.

[0007] By adopting the technical scheme, the positioning rod is inserted into the positioning groove during use, so that the ejector pin can be stably fixed on the positioning seat, the rotation of the ejector pin during work can be effectively prevented, the overall precision and appearance quality of the mold caused by the slight rotation of the ejector pin during production of the high-precision mold can be avoided, the stability of the ejector pin during ejection or resetting can be ensured, the precise cooperation between the ejector pin and other components of the mold can be ensured, and therefore the quality and consistency of the injection-molded product can be improved, the ejector pin can be prevented from being installed in the reverse direction, the rework after installation error can be reduced, and the installation efficiency of the ejector pin can be improved.

[0008] Optionally, the positioning rod and the positioning groove are both in a cylindrical shape, and a connecting mechanism is arranged on the side wall of the end of the positioning rod away from the positioning seat.

[0009] By adopting the technical scheme, the cylindrical arrangement increases the contact area between the positioning rod and the positioning groove, can provide more stable support, effectively prevents the ejector pin from loosening or shifting during work, and therefore improves the service life of the mold. The structure of the positioning rod and the positioning groove is simple, and the positioning rod and the positioning groove are convenient to process and assemble. The connecting mechanism makes the connection between the positioning rod and the positioning groove more stable.

[0010] Optionally, the connecting mechanism comprises a plurality of second mounting grooves circumferentially arranged at the end of the positioning rod close to the mounting seat, a spring fixed in the second mounting groove, and a sliding block fixed at the end of the spring away from the second mounting groove. The sliding block is in a trapezoidal shape and can slide in the second mounting groove.

[0011] By adopting the technical scheme, the sliding block is manually pressed into the second mounting groove during use, and then the positioning rod is slid into the positioning groove, so that the ejector pin is fixed on the positioning seat. At this time, the spring is compressed to generate elastic potential energy, so that one end of the sliding block abuts against the inner wall of the positioning groove to be fixed. The trapezoidal shape of the sliding block makes the sliding block have better stability when sliding in the second mounting groove, and provides guidance for the sliding route.

[0012] Optionally, a plurality of third mounting grooves are circumferentially arranged on the inner wall of the positioning groove, and the third mounting grooves are in a square shape. The sliding block can slide into the third mounting groove.

[0013] By adopting the technical scheme, when the positioning rod slides to a certain position in the positioning groove, the sliding block slides into the third mounting groove under the action of the spring, and at this time, the end wall of the sliding block abuts against the inner wall of the third mounting groove, thereby enhancing the connection strength between the positioning rod and the positioning groove.

[0014] Optionally, an end of the positioning rod away from the mounting base is provided with a connecting seat, the connecting seat and the positioning groove are both provided in a circular truncated cone shape, a first tapered guide surface is provided outside the connecting seat, a second tapered guide surface is provided on the inner wall of the positioning groove, and the first tapered guide surface is in close contact with the second tapered guide surface.

[0015] By adopting the above technical scheme, the cooperation of the first tapered guide surface and the second tapered guide surface can effectively guide the alignment of the positioning rod and the positioning groove, reduce the alignment error in the assembly process, ensure the accurate cooperation of the two, and the circular truncated cone shape provides a larger contact area and enhances the stability of the connection.

[0016] Optionally, a mounting hole is provided between the positioning seat and the positioning rod, and a positioning bolt is arranged in the mounting hole.

[0017] By adopting the above technical scheme, the positioning bolt is mounted in the mounting hole through threaded connection during use, which ensures that the connection between the positioning rod and the positioning seat is more firm, and also facilitates disassembly, maintenance and replacement of parts.

[0018] Optionally, an anti-skid ring is arranged on the inner wall of the positioning groove.

[0019] By adopting the above technical scheme, the anti-skid ring can enhance the friction between the positioning rod and the positioning groove, effectively prevent the positioning rod from sliding or shifting in the positioning groove, ensure the close cooperation between the positioning rod and the positioning groove, and further ensure the stability of the ejector pin during the working process, thereby reducing looseness caused by vibration or external force.

[0020] Optionally, a rubber ring is arranged on the side wall of the positioning rod.

[0021] By adopting the above technical scheme, the rubber ring can provide elastic buffering on one hand, reduce looseness of the positioning rod caused by vibration or impact, and on the other hand, reduce wear and tear and improve service life.

[0022] In summary, the present application has at least one of the following beneficial technical effects:

[0023] 1. During use, the positioning rod is inserted into the positioning groove, so that the ejector pin can be stably fixed on the positioning seat, which can effectively prevent the ejector pin from rotating during the working process, avoid problems in the overall precision and appearance quality of the mold caused by the slight rotation of the ejector pin during the production of high-precision molds, ensure that the ejector pin always remains stable during the ejection or resetting process, ensure the accurate cooperation between the ejector pin and other parts of the mold, thereby improving the quality and consistency of the injection-molded products, and also preventing the ejector pin from being installed in the wrong circumferential position and reducing the rework after installation error, which helps to improve the installation efficiency of the ejector pin;

[0024] 2. The cylindrical arrangement increases the contact area between the positioning rod and the positioning groove, provides more stable support, effectively prevents the ejector pin from loosening or shifting during work, and improves the service life of the mold. The positioning rod and the positioning groove have a simple structure, are easy to process and assemble, and the connection mechanism makes the connection between the positioning rod and the positioning groove more stable.

[0025] 3. When in use, the slider is first manually pressed into the second mounting groove, and then the positioning rod is slid into the positioning groove, so that the ejector pin is fixed on the positioning seat. At this time, the spring is compressed to generate elastic potential energy, so that one end of the slider abuts against the inner wall of the positioning groove and is fixed. The trapezoidal arrangement of the slider provides better stability when the slider slides in the second mounting groove, and provides guidance for the sliding route. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 is the overall structure diagram of the anti-rotation structure of the ejector pin of the injection mold of the embodiment 1 of the present application.

[0028] Figure 2 is the exploded view of the anti-rotation structure of the ejector pin of the injection mold of the embodiment 1 of the present application.

[0029] Figure 3 is the exploded view of the anti-rotation structure of the ejector pin of the injection mold of the embodiment 2 of the present application.

[0030] Figure 4 is the exploded view of the anti-rotation structure of the ejector pin of the injection mold of the embodiment 3 of the present application.

[0031] Reference signs: 1, ejector pin; 2, mounting seat; 3, first mounting groove; 4, positioning mechanism; 5, positioning rod; 6, positioning seat; 7, positioning groove; 8, connecting mechanism; 9, second mounting groove; 10, spring; 11, slider; 12, third mounting groove; 13, connecting seat; 14, first conical guide surface; 15, second conical guide surface; 16, mounting hole; 17, positioning bolt; 18, anti-skid ring; 19, rubber ring. DETAILED DESCRIPTION

[0032] The following will be described in combination with the drawings Figures 1-4 The present application will be further described in detail.

[0033] The embodiment of the present application discloses an anti-rotation structure of an ejector pin of an injection mold.

[0034] Embodiment 1

[0035] With reference to Figure 1 A rotation-preventing structure of an injection mold ejector pin includes an ejector pin 1 and a mounting seat 2, the mounting seat 2 is coaxially sleeved outside the ejector pin 1, the ejector pin 1 and the mounting seat 2 are both cylindrically arranged, a first mounting groove 3 is arranged on the mounting seat 2, and the ejector pin 1 is fixed in the first mounting groove 3. In order to avoid the phenomenon that the ejector pin 1 is stuck due to thermal expansion or machining error, a connecting mode that the ejector pin 1 is in clearance fit with the first mounting groove 3 is arranged.

[0036] With reference to Figure 1 And Figure 2 Since the prior art can cause the ejector pin 1 to produce slight rotation when producing a high-precision mold, thereby affecting the overall precision and appearance quality of the mold, the embodiment is provided with a positioning mechanism 4 outside the mounting seat 2 to ensure that the ejector pin 1 always remains stable during the ejection or resetting process. The positioning mechanism 4 is used for fixing the ejector pin 1, and the positioning mechanism 4 includes a positioning rod 5, a positioning seat 6 and a positioning groove 7. The positioning rod 5 is integrally formed outside the mounting seat 2, a rubber ring 19 is fixed on the side wall of the positioning rod 5, which can provide certain elastic buffer and reduce wear and improve service life. The positioning seat 6 is arranged at the end of the positioning rod 5 away from the mounting seat 2, the positioning groove 7 is arranged on the positioning seat 6, an anti-skid ring 18 is arranged on the inner wall of the positioning groove 7, which can enhance the friction between the positioning rod 5 and the positioning groove 7, effectively prevent the positioning rod 5 from sliding or shifting in the positioning groove 7, the positioning rod 5 and the positioning groove 7 are both cylindrically arranged, so that the contact area between the positioning rod 5 and the positioning groove 7 is increased to provide stable support and effectively prevent the ejector pin 1 from loosening or shifting during the working process, thereby improving the service life of the mold. The side of the positioning rod 5 extending into the positioning groove 7 is attached to the inner wall of the positioning groove 7, and the structure of the positioning rod 5 and the positioning groove 7 is simple, which is convenient for processing and assembly.

[0037] The implementation principle of the rotation-preventing structure of the injection mold ejector pin is that the positioning rod 5 is directly inserted into the positioning groove 7 during use, at this time the ejector pin 1 is stably fixed on the positioning seat 6, which can effectively prevent the ejector pin 1 from rotating during the working process, thereby ensuring the accurate fit between the ejector pin 1 and other components of the mold when producing a high-precision mold, and improving the quality and consistency of the injection products.

[0038] Embodiment 2

[0039] With reference to Figure 1 And Figure 3, in order to make the connection between the positioning rod 5 and the positioning groove 7 more stable, the embodiment is provided with a connecting mechanism 8 on the side wall of the end of the positioning rod 5 away from the positioning seat 6, the connecting mechanism 8 comprises a second mounting groove 9, a spring 10 and a sliding block 11, the second mounting groove 9 is axially provided on the end of the positioning rod 5 close to the mounting seat 2, four second mounting grooves 9 are provided in the embodiment, the spring 10 is fixed in the second mounting groove 9, and the sliding block 11 is fixed at the end of the spring 10 away from the second mounting groove 9, in order to make the sliding block 11 slide in the second mounting groove 9 have better stability and directivity, the sliding block 11 is provided in a trapezoidal shape, and when the spring 10 is compressed, the sliding block 11 slides in the second mounting groove 9. Four third mounting grooves 12 are circumferentially provided on the inner wall of the positioning groove 7, and the third mounting grooves 12 are provided in a square shape, when the sliding block 11 is in a state of restoring elastic deformation, the sliding block 11 slides into the third mounting groove 12, and at this time, the end wall of the sliding block 11 abuts against the inner wall of the third mounting groove 12.

[0040] The implementation principle of the anti-rotation structure of the injection mold ejector pin provided in the embodiment of the application is as follows: in use, the positioning rod 5 is inserted into the positioning groove 7, the four sliding blocks 11 are manually pressed into the second mounting groove 9 first, at this time, the spring 10 is compressed and has elastic potential energy, then the positioning rod 5 is slid into the positioning groove 7, when the positioning rod 5 slides to the position of the third mounting groove 12, the sliding block 11 slides into the third mounting groove 12, and at this time, the end wall of the sliding block 11 abuts against the inner wall of the third mounting groove 12, thereby achieving the fastening connection between the positioning rod 5 and the positioning seat 6, and achieving the stable connection of the ejector pin 1.

[0041] Embodiment 3

[0042] With reference to Figure 1 and Figure 4 , the end of the positioning rod 5 away from the mounting seat 2 is provided with a connecting seat 13, and the connecting seat 13 and the positioning groove 7 are both provided in a circular truncated cone shape, the circular truncated cone shape provides a larger contact area and enhances the stability of the connection, the outer side of the connecting seat 13 is provided with a first tapered guide surface 14, the inner wall of the positioning groove 7 is provided with a second tapered guide surface 15, the first tapered guide surface 14 is in close contact with the second tapered guide surface 15, which can effectively guide the alignment of the positioning rod 5 and the positioning groove 7, reduce the alignment error in the assembly process, and ensure the accurate cooperation between the two. The mounting hole 16 is axially provided between the positioning seat 6 and the positioning rod 5, and the positioning bolt 17 is mounted in the mounting hole 16, the positioning bolt 17 is mounted in the mounting hole 16 through bolt connection, and the connection between the positioning rod 5 and the positioning seat 6 is more firm.

[0043] The implementation principle of the anti-rotation structure of the injection mold ejector pin is as follows: during use, the positioning rod 5 is inserted into the positioning groove 7, at this time, the connecting seat 13 is tightly attached to the positioning groove 7, then the positioning bolt 17 is installed into the mounting hole 16, the fastening connection between the positioning rod 5 and the positioning seat 6 is realized, and thus the stable connection of the ejector pin 1 is realized.

[0044] Unless otherwise defined, technical terms or scientific terms used in the present application shall be understood as having the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms "first", "second", "third" and the like used in the specification and claims of the present application do not denote any order, quantity or importance, but are used to distinguish different components. The terms "one" or "a" and the like do not denote a quantity limitation, but denote the existence of at least one. The terms "including", "containing" and the like mean that the elements or objects appearing before the terms "including" or "containing" cover the elements or objects listed after the terms "including" or "containing" and their equivalents, and do not exclude other elements or objects. The terms "upper", "lower", "left", "right" and the like only represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships may also be changed accordingly.

[0045] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A rotation-preventing structure of an injection mold ejector pin, comprising an ejector pin (1), a mounting base (2) coaxially sleeved outside the ejector pin (1), a first mounting groove (3) being formed on the mounting base (2), the ejector pin (1) being fixed in the first mounting groove (3), and the ejector pin (1) and the first mounting groove (3) being arranged in a clearance fit, characterized in that: The outer side of the mounting base (2) is provided with a positioning mechanism (4) for fixing the ejector pin (1), the positioning mechanism (4) comprises a positioning rod (5) integrally formed on the outer side of the mounting base (2), a positioning seat (6) provided at the end of the positioning rod (5) away from the mounting base (2), and a positioning groove (7) opened on the positioning seat (6), and the side of the positioning rod (5) extending into the positioning groove (7) is attached to the inner wall of the positioning groove (7).

2. The anti-rotation structure of an injection mold ejector pin according to claim 1, wherein: The positioning rod (5) and the positioning groove (7) are both cylindrical, and the side wall of the end of the positioning rod (5) away from the positioning seat (6) is provided with a connecting mechanism (8).

3. The anti-rotation structure of an injection mold ejector pin according to claim 2, wherein: The connecting mechanism (8) comprises a plurality of second mounting grooves (9) circumferentially opened at the end of the positioning rod (5) close to the mounting base (2), a spring (10) fixed in the second mounting groove (9), and a sliding block (11) fixed at the end of the spring (10) away from the second mounting groove (9), wherein the sliding block (11) is trapezoidal, and the sliding block (11) can slide in the second mounting groove (9).

4. The anti-rotation structure of an injection mold ejector pin according to claim 3, wherein: A plurality of third mounting grooves (12) are circumferentially opened on the inner wall of the positioning groove (7), the third mounting grooves (12) are square, and the sliding block (11) can slide into the third mounting grooves (12).

5. The anti-rotation structure of an injection mold ejector pin according to claim 1, wherein: The end of the positioning rod (5) away from the mounting base (2) is provided with a connecting seat (13), the connecting seat (13) and the positioning groove (7) are both circular truncated cone, the outer side of the connecting seat (13) is provided with a first tapered guide surface (14), the inner wall of the positioning groove (7) is provided with a second tapered guide surface (15), and the first tapered guide surface (14) is attached to the second tapered guide surface (15).

6. The anti-rotation structure of an injection mold ejector pin according to claim 5, wherein: The mounting hole (16) is provided between the positioning seat (6) and the positioning rod (5), and the mounting hole (16) is provided with a positioning bolt (17).

7. The anti-rotation structure of an injection mold ejector pin according to claim 1, wherein: The inner wall of the positioning groove (7) is provided with an anti-skid ring (18).

8. The anti-rotation structure of an injection mold ejector pin according to claim 1, wherein: The side wall of the positioning rod (5) is provided with a rubber ring (19).

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