A slide block multi-layer ejection mechanism for injection molds

Abstract

This invention provides a multi-layer ejection mechanism for a slider in injection molds, belonging to the field of mold equipment technology. It includes a base driven by a hydraulic cylinder, a fixed mold slider with its end face being the cavity surface fixed to the base, a base disposed on the side of the fixed mold slider away from the cavity surface, and an ejector pin fixing seat fixed above the base. The fixed mold slider has several inclined ejector pin through holes, and ejector pins slide within these through holes. One end of each ejector pin extends beyond the cavity surface of the fixed mold slider and has an actuating end for forming a barb. The other end of the ejector pin is movably connected to the ejector pin fixing seat. When the hydraulic cylinder drives the base plate to move, the ejector pin moves along the inclined direction of the ejector pin through holes, and the actuating end of the ejector pin disengages from the notch direction of the barb. This invention has the advantage of efficient demolding of plastic parts with multiple undercut structures on one side, improving manufacturing efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of mold equipment technology, and specifically refers to a slider multi-layer ejection mechanism for injection molds. Background Technology

[0002] Injection molding is a common process in the production of plastic products. For complex plastic parts, especially those with features such as undercuts, bosses, or grooves on the sides, these features can hinder direct mold separation in the mold opening direction, making direct demolding impossible through simple moving and fixed mold structures. Automotive parts, such as the armrest boxes of trams or cars, are typical examples of such complex components. To securely connect to the car body or other parts, their outer peripheral walls typically feature multiple recessed or laterally recessed undercut structures on their end faces.

[0003] Traditionally, for plastic parts with undercuts, a slider mechanism driven by inclined guide pillars is used. This involves the inclined guide pillars moving laterally to disengage the undercut area of ​​the plastic part, making room for subsequent ejection and demolding. However, as plastic part designs become increasingly complex and functionally integrated, more undercut structures appear on the end faces. Traditional slider mechanisms now require more complexity, longer demolding times, and lower efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a multi-layer ejection mechanism for a slider in injection molds, which can efficiently release the undercut structure of plastic parts and achieve complete demolding without damage.

[0005] The purpose of this utility model is achieved as follows:

[0006] A multi-layer ejection mechanism for a slider in an injection mold includes a base plate driven by a hydraulic cylinder. A fixed mold slider with its end face being the cavity surface is fixed on the base plate. A base is provided on the side of the fixed mold slider away from the cavity surface. An ejector pin fixing seat is fixed above the base. Several inclined ejector pin through holes are opened in the fixed mold slider. An ejector pin slides in the ejector pin through holes, and one end of the ejector pin extends out of the cavity surface of the fixed mold slider and is formed with an actuating end for forming a barb. The other end of the ejector pin is movably connected to the ejector pin fixing seat. When the hydraulic cylinder drives the base plate to move, the ejector pin moves along the inclined direction of the ejector pin through hole, and the actuating end of the ejector pin disengages from the notch direction of the barb.

[0007] The present invention is further configured such that a limiting protrusion is provided on the base, and the top rod fixing seat is fixed to one side of the limiting protrusion. When the oil cylinder drives the base plate to move to the side close to the top rod fixing seat, the side wall of the base plate abuts against the other side of the limiting protrusion.

[0008] The present invention is further configured such that a guide seat is provided on the side of the ejector rod fixing seat away from the fixed mold slider, and a plurality of guide slide pillars are fixed on the fixed mold slider, the guide slide pillars passing through the ejector rod fixing seat and the guide seat in sequence.

[0009] The present invention is further configured such that a limiting notch is provided on the side of the guide seat near the top rod fixing seat. When the hydraulic cylinder drives the base plate to move to the side near the top rod fixing seat, the bottom of the base plate abuts against the side of the limiting protrusion, and the side wall of the top rod fixing seat is embedded in the limiting notch.

[0010] The present invention is further provided in that the sidewalls of the base and the substrate are provided with guide grooves, and guide sliders are provided on the guide grooves.

[0011] The present invention is further configured such that the ejector pin fixing seat has several mounting grooves on the side near the fixed mold slider, and an upper clamping seat and a lower clamping seat are provided in the mounting grooves. A clamping opening for the end of the ejector pin to extend into is formed between the upper clamping seat and the lower clamping seat. The upper clamping seat and the lower clamping seat have clamping opening grooves facing each other. The end of the ejector pin is fixed with an ejector pin slider whose upper and lower ends are respectively embedded in the upper and lower clamping opening grooves.

[0012] The present invention is further configured such that the end of the push rod is fixed to the push rod slider by means of a hinge pin.

[0013] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0014] 1. The multi-layer ejection mechanism of the slider provided by this utility model uses a fixed mold slider to make the inclined ejector rod slide laterally when it moves, so that the plastic part with the barbed structure can be demolded first at this position. This method can enable plastic parts with different snapping directions on one end face to achieve rapid demolding. Furthermore, during the movement, the fixed mold slider will separate the cavity surface from the plastic part, thereby achieving efficient demolding.

[0015] 2. This utility model has a limiting protrusion on the base, which can limit the sliding distance of the fixed mold slider, so that the ejector pin opens a suitable distance during lateral movement, ensuring normal demolding.

[0016] 3. The addition of a guide seat and guide slide in this utility model further enhances the guiding stability and makes the demolding process smoother.

[0017] 4. In this utility model, an installation groove is opened on the ejector pin fixing seat and an ejector pin slider is placed there. It can effectively set different directions of buckles on one side of the plastic part and has a wide range of applications. At the same time, the ejector pin slider is fixed by means of hinge pin, which can effectively prevent the ejector pin from rotating and ensure demolding accuracy. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the mechanism of this utility model. Figure 2 ;

[0020] Figure 3 This is a cross-sectional schematic diagram of the fixed mold slider of this utility model;

[0021] Figure 4 This is a schematic diagram of the barb structure on the end face of a plastic part;

[0022] Figure 5 This is a schematic diagram of the structure of the top rod fixing seat of this utility model;

[0023] Figure 6 - This is a structural diagram of the new installation slot in this utility model;

[0024] Figure label:

[0025] 1-Substrate; 10-Hydraulic cylinder; 11-Guide groove;

[0026] 2-Fixed mold slide; 20-Ejector pin through hole;

[0027] 3-Base; 30-Limiting protrusion;

[0028] 4-Top rod fixing seat; 40-Mounting groove; 41-Upper clamp; 42-Lower clamp; 43-Clamping opening; 44-Clamping opening slide groove;

[0029] 5-Push rod; 50-Actuating end; 51-Push rod slider;

[0030] 6-Guide seat; 60-Guide slide; 61-Limit notch;

[0031] 7-Guide slider;

[0032] 8a - barb; 8b - barb; 8c - barb. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1 — Figure 6 :

[0034] A multi-layer ejection mechanism for a slider in an injection mold includes a base plate 1 driven by a hydraulic cylinder 10. A fixed mold slider 2 with its end face being the cavity surface is fixed on the base plate 1. A base 3 is provided on the side of the fixed mold slider 2 away from the cavity surface. An ejector pin fixing seat 4 is fixed above the base 3. A plurality of inclined ejector pin through holes 20 are opened in the fixed mold slider 2. An ejector pin 5 slides in the ejector pin through holes 20, and one end of the ejector pin 5 extends out of the cavity surface of the fixed mold slider 2 and is formed with an action end 50 for forming a barb. The other end of the ejector pin 5 is movably connected to the ejector pin fixing seat 4. When the hydraulic cylinder 10 drives the base plate 1 to move, the ejector pin 5 moves along the inclined direction of the ejector pin through hole 20, and the action end 50 of the ejector pin 5 disengages from the notch direction of the barb.

[0035] like Figure 4 As shown in the figure, 8a, 8b and 8c are all barbed positions.

[0036] During implementation, the hydraulic cylinder 10 drives the fixed mold slider 2 to move towards the ejector pin fixing seat 4, while the ejector pin fixing seat 4 remains stationary, preventing the end of the ejector pin 5 from sliding in the inclined direction. The ejector pin 5 will slide along the ejector pin through hole 20. Since the ejector pin through hole 20 is inclined, that is, inclined relative to the direction of movement of the fixed mold slider 2, after injection molding is completed, the end of the ejector pin 5 will disengage in the direction of the barb notch.

[0037] Furthermore, after the action end 50 of the ejector pin 5 disengages from the barb or clip of the plastic part, it can achieve complete separation of the cavity surface, thus achieving efficient demolding.

[0038] It is worth mentioning that, taking the end face perpendicular to the moving direction of the fixed mold slider 2 as the reference plane, and the end point of the ejector rod 5 in the movable connecting ejector rod fixing seat 4 as the center, and the other end point of the ejector rod as the radius, the moving direction of the action end 50 during the movement of the fixed mold slider 2 is the direction from the center of the circle to the end point of the radius. If multiple snap-fit ​​or barb structures are formed on the cavity surface of the plastic part, and the direction of the notch is determined, it is convenient to open corresponding inclined through holes on the fixed mold slider 2, so that when the fixed mold slider 2 moves, several ejector rods can simultaneously disengage from the barb notch, achieving efficient demolding in the subsequent process.

[0039] Preferably, the base 3 is provided with a limiting protrusion 30, and the top rod fixing seat 4 is fixed to one side of the limiting protrusion 30. When the oil cylinder 10 drives the base plate 1 to move to the side close to the top rod fixing seat 4, the side wall of the base plate 1 abuts against the other side of the limiting protrusion 30.

[0040] In the above structure, since the relative error of the barb size in a plastic part is not too large, an appropriate release distance is set. The limit protrusion 30 on the fixed seat 4 limits the stroke length of the fixed mold slider 2, thereby avoiding the normal demolding of the action end 50 due to excessive or insufficient stroke distance.

[0041] Preferably, a guide seat 6 is provided on the side of the ejector pin fixing seat 4 away from the fixed mold slider 2, and a plurality of guide slide pillars 60 are fixed on the fixed mold slider 2. The guide slide pillars 60 pass through the ejector pin fixing seat 4 and the guide seat 6 in sequence. The guide seat 6 plays a guiding and stabilizing role in the fixed mold slider 2.

[0042] Preferably, a limiting notch 61 is provided on the side of the guide seat 6 near the top rod fixing seat 4. When the oil cylinder 10 drives the base plate 1 to move to the side near the top rod fixing seat 4, the bottom of the base plate 1 abuts against the side of the limiting protrusion 30, and the side wall of the top rod fixing seat 4 is embedded in the limiting notch 61.

[0043] In the above structure, the distance between the limiting notch 61 and the ejector pin fixing seat 4 is the complete demolding distance between the plastic part and the fixed mold slider 2.

[0044] Preferably, both the base 3 and the sidewall of the substrate 1 are provided with guide grooves 11, and guide sliders 7 are provided on the guide grooves 11. This structure further enhances stability during guidance.

[0045] Preferably, the ejector rod fixing seat 4 has several mounting grooves 40 on the side near the fixed mold slider 2. An upper clamping seat 41 and a lower clamping seat 42 are provided in the mounting grooves 40. A clamping opening 43 is formed between the upper clamping seat 41 and the lower clamping seat 42 for the end of the ejector rod 5 to extend into. The upper clamping seat 41 and the lower clamping seat 42 are provided with clamping opening grooves 44 facing each other. The end of the ejector rod 5 is fixed with an ejector rod slider 51 whose upper and lower ends are respectively embedded in the upper and lower clamping opening grooves 44.

[0046] During implementation, since the ejector pin 5 will shift within the ejector pin through hole 20 as the fixed mold slider 2 moves, the end of the ejector pin 5 on the side wall of the ejector pin fixing seat 4 needs to move. With the above structure, the end of the ejector pin 5 will slide and shift along the length of the groove in the clamping groove 44.

[0047] It is worth mentioning that the length direction of the groove 44 is adjusted according to the actual notch direction of the plastic part's barb or buckle, so as to adapt to the injection molding of multiple barbs or buckles in such plastic parts.

[0048] Preferably, the end of the push rod 5 is fixed to the push rod slider 51 by means of a hinge pin.

[0049] In the above structure, the end of the top rod 5 is fixed by a hinged pin, which can effectively prevent deflection during the offset process, so as to accurately disengage from the direction of the inverted notch.

[0050] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A multi-layer ejection mechanism for a slider in an injection mold, characterized in that, The system includes a base plate (1) driven by a hydraulic cylinder (10). The base plate (1) is fixed with a fixed mold slider (2) whose end face is a cavity surface. A base (3) is provided on the side of the fixed mold slider (2) away from the cavity surface. A push rod fixing seat (4) is fixed above the base (3). The fixed mold slider (2) has several inclined push rod through holes (20). A push rod (5) is slidably provided in the push rod through holes (20). One end of the push rod (5) extends out of the cavity surface of the fixed mold slider (2) and is formed with an action end (50) for forming a barb. The other end of the push rod (5) is movably connected to the push rod fixing seat (4). When the hydraulic cylinder (10) drives the base plate (1) to move, the push rod (5) moves along the inclined direction of the push rod through hole (20), and the action end (50) of the push rod (5) disengages from the notch direction of the barb.

2. The slider multi-layer ejection mechanism for injection molds according to claim 1, characterized in that, The base (3) is provided with a limiting protrusion (30), and the top rod fixing seat (4) is fixed to one side of the limiting protrusion (30). When the oil cylinder (10) drives the base plate (1) to move to the side close to the top rod fixing seat (4), the side wall of the base plate (1) abuts against the other side of the limiting protrusion (30).

3. A multi-layer ejection mechanism for a slider in an injection mold according to claim 2, characterized in that, The ejector pin fixing seat (4) is provided with a guide seat (6) on the side away from the fixed mold slider (2). Several guide slides (60) are fixed on the fixed mold slider (2). The guide slides (60) pass through the ejector pin fixing seat (4) and the guide seat (6) in sequence.

4. A multi-layer ejection mechanism for a slider in an injection mold according to claim 3, characterized in that, A limiting notch (61) is provided on the side of the guide seat (6) near the top rod fixing seat (4). When the oil cylinder (10) drives the base plate (1) to move to the side near the top rod fixing seat (4), the bottom of the base plate (1) abuts against the side of the limiting protrusion (30), and the side wall of the top rod fixing seat (4) is embedded in the limiting notch (61).

5. A multi-layer ejection mechanism for a slider in an injection mold according to claim 1, characterized in that, Guide grooves (11) are provided on the side walls of the base (3) and the substrate (1), and guide sliders (7) are provided on the guide grooves (11).

6. A multi-layer ejection mechanism for a slider in an injection mold according to claim 1, characterized in that, The ejector pin fixing seat (4) has several mounting slots (40) on the side near the fixed mold slider (2). An upper clamping seat (41) and a lower clamping seat (42) are provided in the mounting slots (40). A clamping opening (43) for the end of the ejector pin (5) to extend into is formed between the upper clamping seat (41) and the lower clamping seat (42). A clamping opening groove (44) is provided opposite to the upper clamping seat (41) and the lower clamping seat (42). An ejector pin slider (51) with its upper and lower ends respectively embedded in the upper and lower clamping opening grooves (44) is fixed at the end of the ejector pin (5).

7. A multi-layer ejection mechanism for a slider in an injection mold according to claim 6, characterized in that, The end of the push rod (5) is fixed to the push rod slider (51) by means of a hinge pin.

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