Multi-stage ejection mechanism matched with mold

Abstract

The utility model discloses a multi-stage ejection mechanism matched with a mold in the technical field of injection molds. The multi-stage ejection mechanism comprises a male mold plate, a male mold bottom plate, a stroke control rod fixedly connected with the male mold bottom plate, an ejector pin base plate, an ejector pin plate, a left ejector rod and a right ejector rod. The left ejector rod and the right ejector rod are symmetrically arranged on the two sides of the stroke control rod and fixedly connected with the ejector pin base plate, the stroke control rod is movably connected with the left ejector rod and the right ejector rod in a clamped mode through bearing fixing blocks, an ejector rod guide cover is installed on the side wall of the ejector pin plate, and the bearing fixing blocks are installed in corresponding sliding grooves in the inner side of the ejector rod guide cover. The ejector base plate drives the ejector plate to move through left and right ejector rods. And an ejector rod is arranged on the male mold bottom plate in a penetrating manner and pushes the ejector pin base plate to move, so that multi-stage ejection action is realized. The injection mold is simple in structure, reliable in movement and capable of effectively improving the segmented control capacity and the ejection stability of the injection mold during forced demolding or ejection of complex structural parts, product deformation is avoided, and the demolding efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a multi-stage ejection mechanism that works with a mold, belonging to the field of injection mold technology. Background Technology

[0002] Injection molding is widely used, and each product is manufactured using a corresponding mold. In daily life, we often encounter products with assembly clips that require a forced demolding structure due to insufficient space. Examples include common bottle caps and buttons.

[0003] Traditional injection molds mostly use a single-stage ejection structure, which means that a single ejector plate pushes the product out of the mold cavity. This structure performs well for products with simple shapes and low demolding resistance. However, for products with complex snap-fit ​​structures, deep cavities, or products that require forced demolding, single-stage ejection often cannot meet the actual production needs. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and to solve the problems of uneven ejection, easy deformation and unreliable resetting in the single-stage ejection structure when ejecting complex structures or products with strong demolding in existing injection molds.

[0005] To solve the above-mentioned technical problems, this utility model is implemented using the following technical solution:

[0006] A multi-stage ejection mechanism for use with a mold is provided, including a male mold plate, a male mold base plate, a stroke control rod fixedly connected to the male mold base plate, an ejector plate, an ejector plate, a left ejector rod, and a right ejector rod;

[0007] A space for ejection is formed between the male mold plate and the male mold base plate; the left ejector rod and the right ejector rod are arranged opposite each other on both sides of the stroke control rod, one end of the stroke control rod is fixedly connected to the male mold base plate, and bearing fixing blocks are respectively provided on both sides of the stroke control rod; an ejector rod guide cover is installed on the side wall of the ejector plate, and the bearing fixing blocks are installed in the corresponding grooves inside the ejector rod guide cover; the stroke control rod is movably engaged with the left ejector rod and the right ejector rod respectively through the bearing fixing blocks; both the left ejector rod and the right ejector rod are fixedly connected to the ejector base plate;

[0008] The ejector plate is moved by bearing fixing blocks that are movably engaged with the left ejector rod and the right ejector rod respectively.

[0009] The surface of the mold base plate is perforated by an ejector pin, and the ejector pin base plate is displaced by the drive of the ejector pin.

[0010] Furthermore, the bearing fixing block is equipped with two ball bearings, each ball bearing being installed inside the bearing fixing block by a fourth locating pin.

[0011] Furthermore, the left push rod and the right push rod are arranged in a mirror image of the stroke control rod, and a first groove that engages with the bearing fixing block is provided on the side near the stroke control rod. The number of first grooves on the surfaces of the left push rod and the right push rod is the same, and the number of first grooves on the surface of the left push rod is the same as the number of first grooves on the ejector plate.

[0012] Furthermore, both side walls of the stroke control rod are provided with a second groove for engaging the bearing fixing block;

[0013] The number of second grooves on one side of the stroke control lever is the same as the number of ejector pins.

[0014] Furthermore, the ejector plate includes a first ejector plate; the bearing fixing block includes a first bearing fixing block;

[0015] When the ejection action is not performed, the distance between the upper surface of the first ejector plate and the lower surface of the male template is the first stroke distance, and the distance between the first bearing fixing block and the second groove is the same as the first stroke distance.

[0016] Furthermore, the ejector plate includes a second ejector plate and a third ejector plate; the bearing fixing block includes a second bearing fixing block and a third bearing fixing block;

[0017] When the ejection action is not performed, the distance between the upper surface of the second ejector plate and the lower surface of the male template is the second stroke distance, and the distance between the second bearing fixing block and the second groove is the same as the second stroke distance;

[0018] The distance between the second ejector plate and the third ejector plate is the third stroke distance, and the distance from the third bearing fixing block to the nearest second groove is the sum of the third stroke distance and the second stroke distance.

[0019] Furthermore, the ejector plate is equipped with a ejector rod guide cover on its side wall, which includes: a first positioning pin is fixedly connected to the side wall of the ejector plate, and the ejector rod guide cover is fixedly connected to the side wall of the ejector plate through the first positioning pin.

[0020] Furthermore, both the left and right push rods are fixedly connected to the push pin base plate via a second positioning pin;

[0021] One end of the stroke control rod is fixedly connected to the mold base plate via a third positioning pin.

[0022] Furthermore, the outer periphery of the left and right push rods is fitted with push rod guide covers, which are also fitted onto the stroke control rod; the bearing fixing block is limited within the push rod guide covers.

[0023] Furthermore, a limiting post penetrates the surface of the ejector plate; the diameter of the limiting post gradually increases from top to bottom in the vertical direction, and the diameter of the notch on the ejector plate surface at the upper end in the vertical direction for the limiting post to penetrate is smaller than the diameter of the notch on the ejector plate surface at the lower end for the limiting post to penetrate.

[0024] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0025] This invention achieves multi-stage, layered ejection by setting a stroke control rod and coordinating with left and right ejector rods, bearing fixing blocks, and multiple ejector plates. The sequential ejection of multiple ejector plates effectively reduces single-point stress during forced demolding, preventing product deformation, and is particularly suitable for complex injection molded parts with snap-fit ​​structures or deep cavities. Simultaneously, the guiding and engaging relationship between the stroke control rod and the bearing fixing block ensures stable switching of the ejector plate movements, guaranteeing synchronous coordination during multi-stage ejection. Limiting and guiding mechanisms between the bearing fixing block, ejector plates, and stroke control rod allow for precise resetting after ejection, improving the continuity and stability of equipment operation. Attached Figure Description

[0026] Figure 1 The figure shown is a cross-sectional view along the Y axis of the three-stage ejection mold in the assembled state of the moving mold side, according to Embodiment 1 of this utility model.

[0027] Figure 2 The image shown is a right-side view of the three-stage ejection mold in the assembled state of the moving mold side, as provided in Embodiment 1 of this utility model.

[0028] Figure 3 The image shown is a right-side split view of the three-stage ejection mold in the assembled state of the moving mold side, as provided in Embodiment 1 of this utility model.

[0029] Figure 4 The figure shown is an exploded view of the three-stage ejection controller assembly provided in Embodiment 1 of this utility model;

[0030] Figure 5 The diagram shown is a Y-axis sectional view of the moving mold side of the two-stage ejection mold provided in Embodiment 2 of this utility model.

[0031] Figure 6 The image shown is a right-side view of the moving mold side of the two-stage ejector mold provided in Embodiment 2 of this utility model, in its assembled state.

[0032] Figure 7 The image shown is a right-side split view of the moving mold side of the two-stage ejection mold provided in Embodiment 2 of this utility model, in its assembled state.

[0033] Figure 8 The figure shown is an exploded view of the two-stage ejector controller assembly provided in Embodiment 2 of this utility model.

[0034] Figure label:

[0035] 1. Ejector rod guide cover; 2. First positioning pin; 3. Left ejector rod; 4. Right ejector rod; 5. Second positioning pin; 6. Stroke control rod; 7. Third positioning pin; 8. Limiting post; 9. Ball bearing; 10. Fourth positioning pin; 11. Ejector roller; 12. Male mold base plate; 13. Male mold plate; 14. Second ejector plate; 15. Third ejector plate; 16. Ejector base plate; 17. First ejector plate; 18. First groove; 19. Second groove; 20. First bearing fixing block; 21. Second bearing fixing block; 22. Third bearing fixing block. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example 1:

[0038] This embodiment provides a three-stage ejection mechanism that works in conjunction with a mold, such as... Figure 1 , Figure 2 and Figure 3 As shown, the structure includes a male mold plate 13, a male mold base plate 12, a stroke control rod 6 fixedly connected to the male mold base plate 12, an ejector plate 16, an ejector plate, a left ejector rod 3, and a right ejector rod 4;

[0039] A space for ejection is formed between the male mold plate 13 and the male mold base plate 12; the left ejector rod 3 and the right ejector rod 4 are arranged opposite to each other on both sides of the stroke control rod 6, one end of the stroke control rod 6 is fixedly connected to the male mold base plate 12, and bearing fixing blocks are respectively provided on both sides of the stroke control rod 6. The bearing fixing blocks are limited to the side wall of the ejector plate, and the stroke control rod 6 is movably engaged with the left ejector rod 3 and the right ejector rod 4 respectively through the bearing fixing blocks; the left ejector rod 3 and the right ejector rod 4 are both fixedly connected to the ejector base plate 16.

[0040] The ejector plate 16 is driven to move by bearing fixing blocks that are movably engaged with the left ejector rod 3 and the right ejector rod 4 respectively.

[0041] The surface of the mold base plate 12 is penetrated by an ejector roller 11, and the ejector pin base plate 16 is displaced by the drive of the ejector roller 11.

[0042] like Figure 4 As shown, the side walls of the second ejector plate 14 and the third ejector plate 15 are both fixedly connected with first positioning pins 2. The second bearing fixing block 21 and the third bearing fixing block 22 have the same structure. The name distinction is only for the convenience of describing the positional relationship. In this embodiment, the second bearing fixing block 21 also acts on the third fixing block. The second bearing fixing block 21 and the third bearing fixing block 22 are both snapped into the sliding groove of the ejector rod guide cover 1. The second bearing fixing block 21 is provided with two ball bearings 9. Each ball bearing 9 is installed in the second bearing fixing block 21 by the fourth positioning pin 10. It should be mentioned that each second bearing fixing block 21 is provided with two ball bearings. The bearing 9, and the ball bearing 9 is partially exposed due to the limitation of the fourth positioning pin 10, so that it can be movably engaged with the left push rod 3 or the right push rod 4. It can also make the bearing fixing block move more easily in the corresponding groove inside the push rod guide cover when it is ejected, so as to avoid being stuck due to tolerance issues such as machining and assembly. At the same time, the second bearing fixing block 21 is limited to the side wall of the ejector plate by the groove of the push rod guide cover 1. In this embodiment, the first positioning pin 2 is set to four and forms a rectangle. Thus, the second bearing can only move in the horizontal direction, thereby realizing the function of the left push rod 3 driving the second ejector plate 14 to move through the second bearing fixing block 21.

[0043] like Figure 3 As shown, the left push rod 3 and the right push rod 4 are arranged in a mirror image of the stroke control rod 6, and a first groove 18 is provided on the side near the stroke control rod 6 to engage with the second bearing fixing block 21. The number of first grooves 18 on the surfaces of the left push rod 3 and the right push rod 4 is the same, and the number of first grooves 18 on the surface of the left push rod 3 is the same as the number of ejector plates. Both side walls of the stroke control rod 6 are provided with second grooves 19 for engaging with the second bearing fixing block 21. The number of second grooves 19 on one side of the stroke control rod 6 is the same as the number of ejector plates.

[0044] Specifically, such as Figure 2As shown, the left push rod 3 and the right push rod 4 are fitted with push rod guide covers 1 on their outer peripheries, and the push rod guide covers 1 are also fitted on the stroke control rod 6; thus, the left push rod 3 and the right push rod 4 are restricted in their direction of movement by the push rod guide covers 1, thereby ensuring stability during the ejection process; in this embodiment, the surface of the stroke control rod 6 is provided with four second grooves 19, and two are provided on each of the two sides of the stroke control rod 6, and they are symmetrical with respect to the center line; since there are two ejector plates, namely the second ejector plate and the third ejector plate 15, the number of second grooves 19 on one side is set to two, which are used to engage with the second bearing fixing block 21.

[0045] One point that needs to be mentioned, such as Figure 1 and Figure 3 As shown, in the state where the ejection action is not performed, the distance between the upper surface of the second ejector plate 14 and the lower surface of the male template 13 is the second stroke distance, the distance between the second bearing fixing block 21 and the second groove 19 is the same as the second stroke distance; the distance between the second ejector plate 14 and the third ejector plate 15 is the third stroke distance, and the distance from the third bearing fixing block 22 to the nearest second groove 19 is the sum of the third stroke distance and the second stroke distance.

[0046] Based on this, when the ejector roller 11 is pushed by an external force, one end of the stroke control rod 6 is fixedly connected to the male mold base plate 12 through the third positioning pin 7, thus the stroke control rod 6 is stationary; the ejector roller 11 pushes the ejector pin base plate 16, and since the side wall of the ejector pin base plate 16 is fixedly connected to the left ejector rod 3 and the right ejector rod 4 through the second positioning pin 5, the left ejector rod 3 and the right ejector rod 4 are driven to move vertically upward. At this time, the second bearing fixing block 21 and the third bearing fixing block 22 are engaged with the first groove 18 on the surface of the left ejector rod 3, and under the action of the first positioning pin 2 and the ejector rod guide cover 1, the second bearing fixing block 21 and the third bearing fixing block 22 cannot move independently, thus driving the second ejector plate 14 and the third ejector plate 15 to move; until the second ejector plate 14 is in contact with the lower surface of the male mold plate 13, at this time the second bearing fixing block 21 and the second groove 19 at the uppermost end of the stroke control rod 6 are on the same horizontal plane, and the ejector roller 11 continues to move. The ball bearing 9 is connected to the bearing fixing block 21 via the fourth pin 10. The second bearing fixing block 21 is disengaged from the first groove 18 via the ball bearing 9 and then engages with the second groove 19 on the same horizontal plane. The left push rod 3 continues to push, and the first groove 18 is not on the same horizontal plane as the second groove 19. At this time, the second ejector plate 14 remains in contact with the male template 13 and is limited by the second groove 19. Similarly, the distance between the second ejector plate 14 and the third ejector plate 15 has been reduced by the second stroke distance, leaving the length of the third stroke distance. When the second ejector plate 14 and the third ejector plate 15 are in contact, the third bearing fixing block 22 can engage with another second groove 19, just like the second bearing fixing block 21, thereby fixing the third ejector plate 15 until the push rod 11 continues to push out, pushing the ejector base plate 16 to the position where it is in contact with the third ejector plate 15. This is the three-stage ejection process of this embodiment.

[0047] like Figure 1 As shown, the surface of the ejector plate is permeated with a limiting post 8; the diameter of the limiting post 8 gradually increases from top to bottom in the vertical direction, and the diameter of the notch on the ejector plate surface at the upper end in the vertical direction for the limiting post 8 to pass through is smaller than the diameter of the notch on the ejector plate surface at the lower end for the limiting post 8 to pass through.

[0048] Specifically, when the ejection ends and the retraction occurs, the ejector rod 11 retracts its force, and the left ejector rod 3 and the right ejector rod 4 move vertically downwards, the same as the ejection process. Combined with the gravity of the second bearing fixing block 21, the third bearing fixing block 22, the second ejector plate 14, and the third ejector plate 15, they are locked back into the first groove 18, thereby achieving reset.

[0049] It should be mentioned that the limiting post 8 is provided with different diameters on different horizontal planes, which are used to engage with the second ejector plate 14 and the third ejector plate 15 respectively. At the same time, since the limiting post 8 passes through the two ejector plates, the diameters of the notches for the limiting post 8 to pass through the second ejector plate 14 and the third ejector plate 15 are different, thereby limiting the second ejector plate 14 and the third ejector plate 15. Example 2:

[0050] like Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, this embodiment provides a two-stage ejection mechanism that works with a mold. The difference from Embodiment 1 is that in this embodiment, there is only one ejector plate, namely the first ejector plate 17; the bearing fixing block includes the first bearing fixing block 20.

[0051] When the ejection action is not performed, the distance between the upper surface of the first ejector plate 17 and the lower surface of the male template 13 is the first stroke distance, and the distance between the first bearing fixing block 20 and the second groove 19 is the same as the first stroke distance.

[0052] Furthermore, the ejection stage is set to two levels, which are only used to achieve the bonding of the first ejector plate 17 with the male template 13 and the bonding of the ejector base plate 16 with the first ejector plate 17.

[0053] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A multi-stage ejection mechanism for use with a mold, characterized in that, include: The mold base plate (13), the mold base plate (12), the stroke control rod (6) fixedly connected to the mold base plate (12), the ejector plate (16), the ejector plate, the left ejector rod (3) and the right ejector rod (4); The male mold plate (13) and the male mold base plate (12) form a space for ejection; the left ejector rod (3) and the right ejector rod (4) are arranged opposite to each other on both sides of the stroke control rod (6), one end of the stroke control rod (6) is fixedly connected to the male mold base plate (12), and bearing fixing blocks are respectively provided on both sides of the stroke control rod (6). The ejector plate is equipped with an ejector rod guide cover (1), and the bearing fixing block is installed in the corresponding slide groove inside the ejector rod guide cover (1). The bearing fixing block is limited to the side wall of the ejector plate. The stroke control rod (6) is movably engaged with the left ejector rod (3) and the right ejector rod (4) respectively through the bearing fixing block; the left ejector rod (3) and the right ejector rod (4) are both fixedly connected to the ejector base plate (16); The ejector plate (16) is driven to move by bearing fixing blocks that are movably engaged with the left ejector rod (3) and the right ejector rod (4) respectively; The surface of the mold base plate (12) is penetrated by an ejector pin (11), and the ejector pin base plate (16) is displaced by the ejector pin (11).

2. The multi-stage ejection mechanism for the mold according to claim 1, characterized in that, The bearing fixing block is equipped with two ball bearings (9), each ball bearing (9) is installed in the bearing fixing block by a fourth positioning pin (10).

3. The multi-stage ejection mechanism for the mold according to claim 1, characterized in that, The left push rod (3) and the right push rod (4) are arranged in a mirror image relative to the stroke control rod (6), and a first groove (18) that engages with the bearing fixing block is provided on the side near the stroke control rod (6). The number of first grooves (18) on the surface of the left push rod (3) and the right push rod (4) is the same, and the number of first grooves (18) on the surface of the left push rod (3) is the same as that of the ejector plate.

4. The multi-stage ejection mechanism for the mold according to claim 3, characterized in that, The stroke control rod (6) has a second groove (19) on both side walls for engaging the bearing fixing block. The number of second grooves (19) on one side of the stroke control lever (6) is the same as the number of ejector plates.

5. The multi-stage ejection mechanism for the mold according to claim 4, characterized in that, The ejector plate includes a first ejector plate (17); the bearing fixing block includes a first bearing fixing block (20). When the ejection action is not performed, the distance between the upper surface of the first ejector plate (17) and the lower surface of the male template (13) is the first stroke distance, and the distance between the first bearing fixing block (20) and the second groove (19) is the same as the first stroke distance.

6. The multi-stage ejection mechanism for the mold according to claim 4, characterized in that, The ejector plate includes a second ejector plate (14) and a third ejector plate (15); the bearing fixing block includes a second bearing fixing block (21) and a third bearing fixing block (22). When the ejection action is not performed, the distance between the upper surface of the second ejector plate (14) and the lower surface of the male template (13) is the second stroke distance, and the distance between the second bearing fixing block (21) and the second groove (19) is the same as the second stroke distance; The distance between the second ejector plate (14) and the third ejector plate (15) is the third stroke distance, and the distance from the third bearing fixing block (22) to the nearest second groove (19) is the sum of the third stroke distance and the second stroke distance.

7. The multi-stage ejection mechanism for the mold according to claim 1, characterized in that, The ejector plate is equipped with a push rod guide cover (1) on its side wall, which includes: a first positioning pin (2) is fixedly connected to the side wall of the ejector plate, and the push rod guide cover (1) is fixedly connected to the side wall of the ejector plate through the first positioning pin (2).

8. The multi-stage ejection mechanism for the mold according to claim 1, characterized in that, The left push rod (3) and the right push rod (4) are both fixedly connected to the push pin base plate (16) by the second positioning pin (5); One end of the stroke control rod (6) is fixedly connected to the mold base plate (12) via a third positioning pin (7).

9. The multi-stage ejection mechanism for the mold according to claim 1, characterized in that, The left push rod (3) and the right push rod (4) are fitted with push rod guide covers (1) on their outer periphery. The push rod guide covers (1) are also fitted on the stroke control rod (6). The bearing fixing block is limited inside the push rod guide covers (1).

10. The multi-stage ejection mechanism for the mold according to claim 1, characterized in that, The surface of the ejector plate is permeated with a limiting post (8); the diameter of the limiting post (8) gradually increases from top to bottom in the vertical direction, and the diameter of the notch on the ejector plate surface at the upper end in the vertical direction for the limiting post (8) to pass through is smaller than the diameter of the notch on the ejector plate surface at the lower end for the limiting post (8) to pass through.

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