Ejector pin retreating mechanism of injection mold
By designing the thimble retraction mechanism of the injection mold, the coordination of the limit step and the compression spring is used to solve the problem that the plastic parts are easily stuck on the thimble when ejected, and the smooth disengagement and removal of the plastic parts are achieved.
Patent Information
- Application Number
- CN202422222557.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-09-10
AI Technical Summary
When the existing injection molds are opened and ejected from plastic parts, the plastic parts are easily stuck on the thimble and difficult to remove due to the thermal expansion and contraction of the plastic parts.
A thimble retraction mechanism for injection molds is designed, including a bottom plate, a rear mold, a first thimble mounting plate, a die core and a front mold. By providing the first and second thimble mounting plates, limit steps and steps, combined with the function of the compression spring, the retreat of the thimble and the smooth separation of the plastic parts are achieved.
It effectively solves the problem of plastic parts stuck on the thimble. Through the coordination of the limit structure and the compression spring, it ensures that the plastic parts can be removed from the thimble smoothly and easily taken out.
Smart Images
Figure CN223001026U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of injection molds, and particularly relates to an ejector pin retraction mechanism for an injection mold. Background Art
[0002] At present, when the existing injection mold is opened and the plastic part is ejected, due to the thermal expansion and contraction of the plastic part, after the plastic part cools, the plastic part is easily stuck on the ejector pin, and it is very difficult to take out the plastic part. Therefore, the structure of the existing injection mold needs to be further improved. Summary of the Utility Model
[0003] The purpose of the utility model is to provide an ejector pin retraction mechanism for an injection mold where the plastic part can be easily taken out.
[0004] The purpose of the utility model is achieved as follows:
[0005] An ejector pin retraction mechanism for an injection mold includes a bottom plate, a rear mold, a first ejector pin mounting plate, a mold core, and a front mold. The rear mold is arranged on the front side of the bottom plate and is fixedly connected to the bottom plate. The mold core is fixed on the front surface of the rear mold. The first ejector pin mounting plate is horizontally slidably arranged between the bottom plate and the rear mold. Multiple first ejector pins are arranged on the first ejector pin mounting plate. The mold core is provided with a first relief long hole corresponding to the first ejector pins. The front end of the first ejector pin horizontally passes through the rear mold and extends into the first relief long hole. Its characteristics are that it further includes a second ejector pin mounting plate. The second ejector pin mounting plate is arranged on the front surface of the first ejector pin mounting plate. Multiple second ejector pins are arranged on the second ejector pin mounting plate. The mold core is provided with a second relief long hole corresponding to the second ejector pins. The front end of the second ejector pin horizontally passes through the rear mold and extends into the second relief long hole. A first limiting step is arranged in the second relief long hole. A first limiting step is arranged on the side wall of the second ejector pin. The first limiting step and the first limiting step cooperate with each other. Corresponding to the second ejector pins, a first installation channel and a second installation channel are respectively arranged on the first ejector pin mounting plate and the second ejector pin mounting plate. A second limiting step is arranged in the second installation channel. A second limiting step is arranged on the side wall of the second ejector pin. The second limiting step and the second limiting step cooperate with each other. A compression spring is arranged in the first installation channel. The front end of the compression spring abuts against the rear end of the second ejector pin.
[0006] The utility model can be further improved as follows.
[0007] The front end of the second ejector pin is in a stepped shape.
[0008] The utility model further includes a push rod. The push rod is horizontally slidably arranged in the first installation channel. The compression spring is sleeved on the push rod. The front end of the compression spring abuts against the push rod. The front end of the push rod abuts against the rear end of the second ejector pin.
[0009] The push rod is in a T shape.
[0010] The beneficial effects of the utility model are as follows:
[0011] The first ejector pin and the second ejector pin of the present utility model eject the plastic part together. The plastic part is clamped on the second ejector pin. Subsequently, due to the first limit step and the first stepped limit function, the second ejector pin stops sliding forward, and the first ejector pin continues to slide forward. The plastic part is pushed away from the front end of the second ejector pin by the first ejector pin, so that the plastic part is separated from the first ejector pin and the second ejector pin, facilitating extraction. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 is a schematic structural view of the injection mold of the present utility model.
[0013] Figure 2 is a schematic structural view of the injection mold of the present utility model from another angle.
[0014] Figure 3 is the front view of the injection mold of the present utility model.
[0015] Figure 4 is Figure 3 the cross-sectional view at A-A in
[0016] Figure 5 is Figure 3 the cross-sectional view at B-B in
[0017] Figure 6 is the exploded view of the injection mold of the present utility model.
[0018] Figure 7 is the schematic structural view of the injection mold of the present utility model after omitting the front mold and the rear mold (the ejector pins are not ejected).
[0019] Figure 8 is Figure 7 the cross-sectional view of
[0020] Figure 9 is the schematic structural view of the injection mold of the present utility model after omitting the front mold and the rear mold (the ejector pins are ejected).
[0021] Figure 10 is Figure 9 the cross-sectional view of DETAILED DESCRIPTION OF THE EMBODIMENTS
[0022] The present utility model will be further described below in conjunction with the drawings and embodiments.
[0023] Embodiment 1, as Figures 1 to 10As shown in the figure, an ejector pin retraction mechanism for an injection mold includes a bottom plate 1, a rear mold 2, a first ejector pin mounting plate 4, a mold core 21, and a front mold 3. The rear mold 2 is disposed on the front side of the bottom plate 1 and fixedly connected to the bottom plate 1. The mold core 21 is fixed on the front surface of the rear mold 2. The first ejector pin mounting plate 4 is horizontally slidably disposed between the bottom plate 1 and the rear mold 2. A plurality of first ejector pins 41 are provided on the first ejector pin mounting plate 4. The mold core 21 is provided with a first relief long hole 611 corresponding to the first ejector pins 41. The front ends of the first ejector pins 41 horizontally pass through the rear mold 2 and extend into the first relief long hole 611. It is characterized in that it further includes a second ejector pin mounting plate 5. The second ejector pin mounting plate 5 is disposed on the front surface of the first ejector pin mounting plate 4. A plurality of second ejector pins 61 are provided on the second ejector pin mounting plate 5. The mold core 21 is provided with a second relief long hole 612 corresponding to the second ejector pins 61. The front ends of the second ejector pins 61 horizontally pass through the rear mold 2 and extend into the second relief long hole 612. A first limiting step 67 is provided in the second relief long hole 612. A first limiting step 65 is provided on the side wall of the second ejector pin 61. The first limiting step 67 and the first limiting step 65 cooperate with each other. The first ejector pin mounting plate 4 and the second ejector pin mounting plate 5 are respectively provided with a first mounting channel 69 and a second mounting channel 610 corresponding to the second ejector pins. A second limiting step 66 is provided in the second mounting channel 610. A second limiting step 64 is provided on the side wall of the second ejector pin 61. The second limiting step 66 and the second limiting step 64 cooperate with each other. A compression spring 62 is provided in the first mounting channel 69. The front end of the compression spring 62 abuts against the rear end of the second ejector pin 61.
[0024] As a more specific technical solution of the present invention.
[0025] The front end of the second ejector pin 61 is in a stepped shape.
[0026] The front end of the second ejector pin 61 is exposed on the front surface of the mold core 21.
[0027] The present invention further includes a push rod 63. The push rod 63 is horizontally slidably disposed in the first mounting channel 69. The compression spring 62 is sleeved on the push rod 63. The front end of the compression spring 62 abuts against the push rod 63. The front end of the push rod 63 abuts against the rear end of the second ejector pin 61.
[0028] The push rod 63 is in a T shape.
[0029] The working principle of the present invention is:
[0030] When the plastic part 7 is ejected by the present utility model, the bottom plate 1, the rear mold 2 and the mold core 21 are fixed. The oil cylinder presses the first ejector pin mounting plate 4 and the second ejector pin mounting plate 5 forward. The first ejector pin mounting plate 4 and the second ejector pin mounting plate 5 slide forward. When the first ejector pin 41 and the second ejector pin 61 eject the plastic part 7 forward together, the plastic part 7 is separated from the mold core 21. Due to thermal expansion and contraction, the plastic part 7 is clamped on the second ejector pin 61. Due to the first limit step 65 and the first stepped limit function, the second ejector pin 61 stops sliding forward. The first ejector pin 41 continues to slide forward, and the plastic part is pushed away from the front end of the second ejector pin 61 by the first ejector pin 41, so that the plastic part is separated from the first ejector pin 41 and the second ejector pin 61, which is convenient for taking out.
Claims
1. An ejector retraction mechanism for an injection mold, comprising a base plate (1), a rear mold (2), a first ejector mounting plate (4), a mold core (21) and a front mold (3), wherein the rear mold (2) is arranged on the front side of the base plate (1) and is fixedly connected to the base plate (1), and the mold core (21) is fixed on the front surface of the rear mold (2), wherein: The mold core (21) is provided with a first long hole (611) corresponding to the first ejector pin (41); the front end of the first ejector pin (41) passes through the rear mold (2) horizontally and extends into the first long hole (611); the second ejector pin mounting plate (5) is arranged on the front surface of the first ejector pin mounting plate (4); the second ejector pin mounting plate (5) is provided with a plurality of second ejector pins (61); the mold core (21) is provided with a second long hole (612) corresponding to the second ejector pin (61); the front end of the second ejector pin (61) passes through the rear mold (2) horizontally and extends into the second long hole (611); 12), a first limiting step (67) is provided in the second yielding long hole (612), a first limiting step (65) is provided on the side wall of the second ejector pin (61), the first limiting step (67) and the first limiting step (65) cooperate with each other, a first installation channel (69) and a second installation channel (610) are respectively provided on the first ejector pin installation plate (4) and the second ejector pin installation plate (5) corresponding to the second ejector pin, a second limiting step (66) is provided in the second installation channel (610), a second limiting step (64) is provided on the side wall of the second ejector pin (61), the second limiting step (66) and the second limiting step (64) cooperate with each other, a compression spring (62) is provided in the first installation channel (69), and the front end of the compression spring (62) abuts against the rear end of the second ejector pin (61).
2. The ejector pin retraction mechanism of the injection mold according to claim 1, characterized in that: The front end of the second ejector pin (61) is step-shaped.
3. The ejector pin retraction mechanism of the injection mold according to claim 1, characterized in that: It also includes a push rod (63) which is horizontally slidably arranged in the first installation channel (69), a compression spring (62) is sleeved on the push rod (63), a front end of the compression spring (62) abuts against the push rod (63), and a front end of the push rod (63) abuts against a rear end of the second push pin (61).
4. The ejector pin retraction mechanism of the injection mold according to claim 1, characterized in that: The ejector pin (63) is in a T-shape.