Three-time ejection mechanism and injection mold

Abstract

The utility model relates to a three-time ejection mechanism and an injection mold, and relates to the technical field of molds, the three-time ejection mechanism comprises a mold core assembly, the mold core assembly comprises an ejector sleeve needle, an ejector sleeve, a mold core and a fixing sleeve, one end of the ejector sleeve needle, one end of the ejector sleeve, one end of the mold core and one end of the fixing sleeve penetrate through a mold core plate to be in contact with a product, and the other end of the fixing sleeve is in contact with the product. The mold core and the other end of the fixing sleeve are fixedly arranged; the ejector sleeve and the other end of the ejector sleeve needle are fixed on the push plate assembly, and the push plate assembly is used for driving the ejector sleeve and the ejector sleeve needle to move; the stroke control assembly is used for controlling the moving stroke of the push plate assembly and the core plate; the push plate assembly is used in cooperation with the stroke control assembly and used for enabling the product to be sequentially separated from the fixing sleeve, the mold core plate, the mold core and the ejector sleeve. By means of the step-by-step ejection mechanism, impact on the internal structure of the product can be reduced, complete ejection of the product can be achieved, and the yield of the product is increased.

Description

Technical Field

[0001] The present application relates to the field of mold technology, and in particular to a three-time ejection mechanism and an injection mold. Background Art

[0002] In the production of plastic bottle caps, mold design and application are crucial. Bottle caps are typically produced using injection molding, a process that requires specially designed molds for high precision and efficiency. However, the complex internal structure of bottle caps presents challenges during demolding.

[0003] Prior art typically relies on a single ejection device to remove the bottle cap from the mold after molding. While this solution successfully ejects the cap from the mold in most cases, it fails to account for the complex internal structure of the cap. This can easily result in excessive mechanical stress on the cap during ejection, damaging the integrity of its internal structure. This not only leads to substandard products, but also directly impacts production efficiency and wastes resources.

[0004] Therefore, improving the effectiveness and safety of the bottle cap demoulding process is particularly important. To solve this problem, it is urgent to design a new ejection structure that can adopt a step-by-step ejection method based on the internal structural characteristics of the bottle cap to ensure the integrity of the bottle cap and improve the product yield. Utility Model Content

[0005] In order to ensure the structural integrity of the product during the demoulding process, the present application provides a three-time ejection mechanism and an injection mold.

[0006] The present application provides a three-stage ejection mechanism and an injection mold that adopt the following technical solutions:

[0007] A three-stage ejection mechanism is used to eject a product from a mold, wherein the mold includes a core plate for molding the product; the three-stage ejection mechanism includes:

[0008] A core assembly, comprising a sleeve needle, a sleeve, a core, and a fixed sleeve, wherein one end of the sleeve needle, the sleeve, the core, and the fixed sleeve passes through the core plate and contacts the product, and the other end of the core and the fixed sleeve are fixedly arranged;

[0009] A push plate assembly, on which the other ends of the sleeve and the sleeve needle are fixed, and the push plate assembly is used to drive the sleeve and the sleeve needle to move;

[0010] A stroke control assembly, used for controlling the movement stroke of the core assembly and the core plate;

[0011] The push plate assembly is used in conjunction with the stroke control assembly to enable the product to sequentially separate from the fixed sleeve, the core plate and the core, and the sleeve.

[0012] By adopting the above technical solution, the present application utilizes a step-by-step ejection mechanism to effectively reduce the impact on the internal structure of the product during the demolding process and improve the yield rate of the product; by designing a stroke control component, the stroke of the push plate assembly, the core assembly and the core plate can be adjusted and controlled to ensure that each stage of the ejection action is within a predetermined range, avoiding over-ejection or under-ejection; through the effective cooperation of the push plate assembly and the stroke control assembly, not only the accuracy and safety of the ejection process are improved, but also the production efficiency and product quality are significantly improved, ensuring the smooth progress of the demolding process; and the design of the mechanism allows flexible adjustment according to products of different shapes and sizes, which can adapt to the molding requirements of a variety of products and improve the versatility and flexibility of the mold.

[0013] In a specific possible implementation scheme, the push plate assembly includes a first push plate and a second push plate, the sleeve needle passes through the second push plate and is connected to the first push plate, the sleeve is connected to the second push plate, and the first push plate is movably connected to the second push plate and the core plate through the stroke control assembly.

[0014] By adopting the above technical solution, by effectively controlling the movement of the second push plate and the core plate, it is ensured that the ejection process each time is controllable, and it can be ejected in steps according to the structure of the product, ensuring the molding integrity of the product and improving the overall quality of the product.

[0015] In a specific possible implementation scheme, the stroke control assembly includes a spring block part, a movable rod and a control rod. The core plate and the second push plate are both provided with the spring block part. The control rod is fixedly arranged. The movable rod is connected to the first push plate and slides inside the control rod. The movable rod is clamped and connected to the spring block part to drive the spring block part to move. The control rod is used to squeeze the spring block part to disconnect the movable rod from the spring block part.

[0016] By adopting the above technical solution, the design precisely controls the movement of the movable rod through the cooperation of the spring block and the control rod, making the ejection process controllable and orderly. The disconnection mechanism effectively prevents excessive movement, reduces the risk of product damage, and enhances operational safety. The component design can meet the ejection requirements of various products and can be flexibly adjusted according to different situations.

[0017] In a specific possible implementation scheme, the spring block includes a fixed seat, a spring block and a spring arranged in the fixed seat. The fixed seat is fixed on the core plate or the second push plate. One end of the spring is connected to the core plate or the second push plate, and the other end is connected to the spring block. The spring block slides in the fixed seat, and the spring block extends out of the fixed seat and engages with the movable rod.

[0018] By adopting the above technical solution, step-by-step ejection is achieved through the combination of the spring block and the movable rod, and the ejection process can be adjusted according to the requirements of the product to ensure the molding integrity of the product; the clamping mechanism of the spring block and the movable rod can effectively convert the movement of the first push plate into the movement of the second push plate and the core plate, thereby improving the efficiency of ejection; the presence of the spring provides a reset force for the spring block, ensuring that the spring block can quickly return to its initial position after demolding, thereby preventing damage caused by malfunction or excessive movement.

[0019] In a specific possible implementation scheme, the movable rod is provided with a locking protrusion, the locking protrusion is correspondingly arranged with the elastic block, the locking protrusion is locked with the elastic block, and the locking protrusion and the elastic block are connected by a plane locking connection.

[0020] By adopting the above technical solution, when the movable rod moves, the engaging protrusion transmits the movement directly to the spring block by engaging with the spring block, converting the movement of the first push plate into the movement of the second push plate and the core plate, thereby achieving coordinated work; the flat engaging design provides a larger contact area, increases the stability of the connection, and prevents loosening or falling off during movement.

[0021] In a specific possible implementation scheme, the control rod is provided with an extrusion slope, and the spring block is provided with a matching slope, and the extrusion slope is used to squeeze the matching slope to disengage the spring block from the engaging protrusion and retract it into the fixing seat.

[0022] By adopting the above technical solution, when the control rod moves, the extrusion slope will squeeze the matching slope of the spring block, thereby disengaging the spring block from the engaging protrusion, and the spring block will retract into the fixed seat, releasing the engaging relationship between the spring block and the movable rod, and the corresponding core plate or second push plate will stop moving, thereby realizing stroke control.

[0023] In a specific possible implementation manner, the engaging protrusion is provided with a reset inclined surface, and the reset inclined surface is used to press the matching inclined surface to retract the spring block into the fixing seat, thereby achieving the reset of the movable rod.

[0024] By adopting the above technical solution, when the movable rod returns to its initial position, the reset slope will squeeze the matching slope of the spring block, prompting the spring block to retract into the fixed seat. After the spring block retracts, the movable rod can smoothly return to its original position, ensuring the normal operation of the entire system.

[0025] In a specific embodiment, a clearance groove is provided on the outer wall of the elastic block, and the clearance groove is used to prevent the elastic block from getting stuck due to overtightening when moving.

[0026] By adopting the above technical solution, the gap groove provides a certain space, allowing the bullet to have sufficient freedom when moving, preventing the bullet from getting stuck due to being too close to the fixed seat or other components during movement, and ensuring the smooth operation of the bullet during operation.

[0027] In a specific possible implementation scheme, the elastic block is provided with a groove, a bearing is rotatably provided in the groove, the bearing extends out of the groove, a rolling groove is provided on the fixing seat, the bearing is inserted into the rolling groove and rolls in the rolling groove.

[0028] By adopting the above technical solution, the rolling of the bearing allows the bullet to obtain lower friction during movement, significantly improving the stability and smoothness of movement, thereby improving the working efficiency of the entire device, and reducing component wear, thereby extending the service life of the bullet and its related parts.

[0029] An injection mold comprises the three-time ejection mechanism described above.

[0030] In summary, the present application includes at least one of the following beneficial technical effects: the design of the three-time ejection mechanism allows the product to be ejected in stages, which can achieve complete ejection of the product and ensure that the product structure is not damaged; by utilizing the coordinated work between the stroke control component, the core component, and the push plate component, the stroke of the push plate component, the core component and the core plate can be adjusted and controlled by the stroke control component, thereby ensuring that each stage of the ejection action is within a predetermined range, avoiding excessive or insufficient ejection, which not only improves the accuracy and safety of the ejection process, but also significantly improves production efficiency and product quality, and ensures the smooth progress of the demolding process; the mechanism can adapt to products of different shapes and sizes, improves the versatility and flexibility of the injection mold, and is suitable for the production of a variety of injection molded products. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural diagram showing the injection mold and the three-time ejection mechanism.

[0032] Figure 2 It is a cross-sectional view used to show the three-stage ejection mechanism.

[0033] Figure 3 It is an exploded view used to show the stroke control components.

[0034] Figure 4 This is a cross-sectional view showing the stroke control assembly.

[0035] Figure 5 It is a cross-sectional view used to show the three-step ejection mechanism during injection molding.

[0036] Figure 6 It is a cross-sectional view showing the three-stage ejection mechanism during the first ejection.

[0037] Figure 7 It is a cross-sectional view showing the three-stage ejection mechanism during the second ejection.

[0038] Figure 8 It is a cross-sectional view showing the three-time ejection mechanism during the third ejection.

[0039] Figure 9 It is a cross-sectional view used to show the bullet, bearing, and fixed seat.

[0040] Explanation of the accompanying reference numerals: 1. Injection mold; 11. Core plate; 12. Bottom plate; 13. Fixed plate; 14. Top plate; 2. Core assembly; 21. Sleeve needle; 22. Sleeve; 23. Core; 24. Fixed sleeve; 3. Push plate assembly; 31. First push plate; 32. Second push plate; 4. Stroke control assembly; 5. Movable rod; 51. Engaging protrusion; 52. Reset slope; 6. Control rod; 61. Extrusion slope; 7. Spring block; 71. Fixed seat; 72. Spring block; 73. Spring; 74. Matching slope; 75. Clearance groove; 76. Groove; 77. Bearing; 78. Rolling groove; 8. Ejector pin. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-9 This application is described in further detail.

[0042] Example 1

[0043] Reference Figure 1 and Figure 2 The embodiment of the present application discloses a three-stage ejection mechanism, including but not limited to being applied to an injection mold 1. In this embodiment, the injection mold 1 includes a bottom plate 12, a fixed plate 13, a top plate 14, and a core plate 11 arranged from bottom to top. The core plate 11 has a cavity for molding a product. There is a movable space between the fixed plate 13 and the bottom plate 12 and the top plate 14. In this embodiment, the injection mold 1 includes but is not limited to being provided with four sets of three-stage ejection mechanisms, and the three-stage ejection mechanisms are symmetrically arranged in pairs.

[0044] The three-time ejection mechanism includes: a core assembly 2, which is inserted into the injection mold 1. The core assembly 2 includes a sleeve needle 21, a sleeve 22, a core 23 and a fixed sleeve 24, which are sequentially mounted from the inside to the outside. One end of the sleeve needle 21, the sleeve 22, the core 23 and the fixed sleeve 24 all pass through the core plate 11 and contact the product. The other ends of the core 23 and the fixed sleeve 24 are fixedly arranged on the top plate 14. In this embodiment, the heights of the sleeve needle 21, the sleeve 22, the core 23 and the fixed sleeve 24 decrease from the inside to the outside.

[0045] The push plate assembly 3, the other end of the sleeve 22 and the sleeve needle 21 are fixed to the push plate assembly 3, and the push plate assembly 3 is used to drive the sleeve 22 and the sleeve needle 21 to move; in this embodiment, the three-time ejection mechanism also includes an ejector pin 8, which is connected to the push plate assembly 3 and is used to drive the push plate assembly 3 to move;

[0046] The stroke control assembly 4 is used to control the movement stroke of the core assembly 2 and the core plate 11;

[0047] The push plate assembly 3 is used in conjunction with the stroke control assembly 4 to sequentially separate the product from the fixed sleeve 24, the core plate 11 and the core 23, and the sleeve 22;

[0048] When the injection molding is completed, the product still remains on the core plate 11 of the injection mold 1, and the ejection mechanism is in standby state; during the demoulding work, the ejector pin 8 starts to drive the push plate assembly 3 to move upward, and the push plate assembly 3 will drive the sleeve 22 and the sleeve needle 21 as well as the core plate 11 to move upward, and the sleeve 22 and the sleeve needle 21 will eject the product from the fixed sleeve 24, completing one ejection; after the product is separated from the fixed sleeve 24, the push plate assembly 3 continues to move and drives the sleeve 22 and the sleeve needle 21 to move upward. At this time, the core plate 11 stops moving, and the sleeve 22 and the sleeve needle 21 eject the product from the core plate 11 and the core 23, completing the second ejection; the push plate assembly 3 continues to move and drives the sleeve needle 21 to move. At this time, the sleeve 22 stops moving, and the sleeve needle 21 completely ejects the product from the sleeve 22, completing three ejections, thereby achieving complete ejection of the product;

[0049] During the demolding process, by adopting a step-by-step ejection mechanism, the impact on the internal structure of the product during the demolding process can be reduced, and the product yield rate can be improved; by designing the stroke control component 4, the stroke of the push plate component 3, the core component 2 and the core plate 11 can be adjusted to ensure that each stage of the ejection action is within the predetermined range, avoiding over-ejection or under-ejection.

[0050] Reference Figure 2-Figure 4, the push plate assembly 3 includes a first push plate 31 and a second push plate 32. In this embodiment, the first push plate 31 is arranged between the bottom plate 12 and the fixed plate 13, and the second push plate 32 is arranged between the fixed plate 13 and the top plate 14. The ejector pin 8 passes through the bottom plate 12 and is connected to the first push plate 31, thereby driving the first push plate 31 to move. The first push plate 31 and the second push plate 32 are movably arranged. The end of the sleeve 22 away from the product sequentially passes through the core plate 11 and the top plate 14 and is connected to the second push plate 32. The end of the sleeve needle 21 away from the product sequentially passes through the core plate 11, the top plate 14, the second push plate 32, and the fixed plate 13 and is connected to the first push plate 31.

[0051] The first push plate 31 is movably connected to the second push plate 32 and the core plate 11 through the stroke control assembly 4; when the stroke control assembly 4 is connected to the second push plate 32 and / or the core plate 11, the first push plate 31 drives the second push plate 32 and / or the core plate 11 to move; when the stroke control assembly 4 is disconnected from the second push plate 32 and / or the core plate 11, the second push plate 32 and / or the core plate 11 stop moving;

[0052] The stroke control assembly 4 includes a spring member 7, a movable rod 5, and a control rod 6. The core plate 11 and the second push plate 32 are both provided with a spring member 7. In this embodiment, one end of the control rod 6 is fixed to the bottom plate 12, and the other end is fixed to the top plate 14. The movable rod 5 and the control rod 6 are provided on the outer wall of the injection mold 1 and are both provided along the height direction of the injection mold 1. The movable rod 5 is connected to the first push plate 31. The movable rod 5 is embedded in the control rod 6 and slides within the control rod 6.

[0053] During demolding, the movable rod 5 is engaged with the elastic block 7 to drive the elastic block 7 to move, thereby driving the second push plate 32 and the core plate 11 connected to the elastic block 7 to move. The control rod 6 is used to squeeze the elastic block 7 to disconnect the movable rod 5 from the elastic block 7. This design precisely controls the movement of the movable rod 5 through the cooperation between the elastic block 7 and the control rod 6, making the ejection process controllable and orderly. The disconnection mechanism can prevent excessive movement, reduce the risk of product damage, and enhance operational safety.

[0054] The two sets of spring block members 7 each include a fixing seat 71 and a spring block 72 and a spring 73 arranged in the fixing seat 71. In the present embodiment, the fixing seat 71 and the spring block 72 are arranged horizontally, and the fixing seat 71 is fixed to the core plate 11 and the second push plate 32 respectively. One end of the spring 73 is connected to the core plate 11 or the second push plate 32, and the other end is connected to the spring block 72. The spring block 72 slides in the fixing seat 71, and the end of the spring block 72 away from the spring 73 extends out of the fixing seat 71; the movable rod 5 is provided with two engaging protrusions 51, the engaging protrusions 51 and the spring block 72 are arranged correspondingly, and one end of the spring block 72 extending out of the fixing seat 71 is engaged with the engaging protrusion 51, and the engaging protrusion 51 and the spring block 72 are connected by a plane engaging connection;

[0055] The combination of the spring block 72 and the movable rod 5 realizes step-by-step ejection, and the ejection process can be adjusted according to the requirements of the product, thereby ensuring the molding integrity of the product. When the movable rod 5 moves, the engaging protrusion 51 directly transmits the motion to the spring block 72 by engaging with the spring block 72. The engaging mechanism between the spring block 72 and the movable rod 5 effectively converts the motion of the first push plate 31 into the motion of the second push plate 32 and the core plate 11, thereby improving the ejection efficiency. In addition, the planar engaging design of the engaging protrusion 51 and the spring block 72 can provide a larger contact area and increase the stability of the connection. In actual operation, the presence of the spring 73 provides a reset force for the spring block 72, ensuring that after demolding, the spring block 72 can quickly return to its original position to prepare for the next round of operation, and can prevent damage caused by malfunction or excessive movement.

[0056] In this embodiment, clearance grooves 75 are provided on the upper and lower outer walls of the spring block 72. The clearance grooves 75 are used to prevent the spring block 72 from getting stuck due to being too tight when moving. The clearance grooves 75 can provide a certain amount of space, allowing the spring block 72 to have sufficient freedom when moving, and prevent the spring block 72 from getting stuck due to being too tight with the fixing seat 71 or other components during movement, thereby ensuring smooth operation of the spring block 72 during operation.

[0057] The control rod 6 is provided with an extrusion bevel 61, and the spring block 72 is provided with a matching bevel 74. When the control rod 6 moves, the extrusion bevel 61 will squeeze the matching bevel 74 of the spring block 72, thereby disengaging the spring block 72 from the engaging protrusion 51, allowing the spring block 72 to retract into the fixed seat 71. After the spring block 72 is retracted, when the control rod 6 is released, the spring block 72 can return to its original position by virtue of the release force after the compressed energy storage, ready for the next operation. This design can effectively control the disengagement and retraction of the spring block 72, improve the smoothness of operation, and enhance the reliability of the entire system.

[0058] The engaging protrusion 51 is provided with a reset slope 52, which is used to squeeze the matching slope 74 to retract the spring block 72 into the fixed seat 71, thereby realizing the reset of the movable rod 5; the design of the reset slope 52 enables the spring block 72 to automatically reset after the movable rod 5 completes the movement, reducing the need for manual intervention, which not only improves the operating efficiency, but also enhances the overall stability and durability.

[0059] Reference Figure 5-Figure 8 In the initial state, the first push plate 31 is connected to the second push plate 32 and the core plate 11 through the stroke control assembly 4. At this time, the spring blocks 72 on the second push plate 32 and the core plate 11 are fixedly engaged with the engaging protrusions 51 on the movable rod 5, thereby achieving the connection between the first push plate 31, the second push plate 32 and the core plate 11;

[0060] During demoulding, the ejector pin 8 starts to drive the first push plate 31 to move upward. When the first push plate 31 moves upward, the movable rod 5 connected to the first push plate 31 will drive the elastic block 72 connected to it to move upward, thereby driving the second push plate 32 and the core plate 11 to move upward. In the process of the first push plate 31 and the second push plate 32 moving upward, the sleeve 22 and the sleeve needle 21 connected to them will be pushed upward. The sleeve 22 and the sleeve needle 21 will together eject the product from the fixed sleeve 24, completing one ejection work;

[0061] The first push plate 31 continues to move. At this time, the spring block 72 on the core plate 11 will first encounter the extrusion inclined surface 61 of the control rod 6. At this time, the control rod 6 squeezes the matching inclined surface 74 of the spring block 72 through the extrusion inclined surface 61, causing the spring block 72 to retract into the fixed seat 71, releasing the clamping relationship between the spring block 72 and the movable rod 5, thereby stopping the movement of the core plate 11. At this time, the first push plate 31 continues to drive the first push plate 31 to move, and drives the sleeve 22 and the sleeve needle 21 to move. The sleeve 22 and the sleeve needle 21 eject the product from the core plate 11 and the core 23, completing the secondary ejection work;

[0062] When the first push plate 31 continues to move, the spring block 72 on the second push plate 32 encounters the extrusion slope 61 of the control rod 6. At this time, the control rod 6 squeezes the matching slope 74 of the spring block 72 through the extrusion slope 61, causing the spring block 72 to retract into the fixed seat 71, releasing the engagement between the spring block 72 and the movable rod 5, thereby stopping the second push plate 32 and the sleeve 22 from moving. At this time, the first push plate 31 continues to move and drives the sleeve needle 21 to move. The sleeve needle 21 is fully ejected and the product is ejected from the sleeve 22, completing three ejection operations.

[0063] After the demoulding work is completed, the reset work needs to be performed. The ejector 8 starts to drive the first push plate 31 to move downward, driving the movable rod 5 connected to it to move downward. When the engaging protrusion 51 on the movable rod 5 encounters the elastic block 72, the reset inclined surface 52 of the engaging protrusion 51 will squeeze the matching inclined surface 74 of the elastic block 72, prompting the elastic block 72 to retract into the fixed seat 71. After the elastic block 72 retracts, the movable rod 5 can continue to move downward, thereby being able to smoothly return to its original position, ensuring the normal operation of the entire system.

[0064] The injection mold 1 of the present application utilizes a three-stage ejection mechanism design to allow for staged ejection of the product, thereby enabling complete ejection of the product and ensuring that the product structure is not damaged. The stroke control assembly 4, the core assembly 2, and the push plate assembly 3 work in coordination, and the stroke of the push plate assembly 3, the core assembly 2, and the core plate 11 can be adjusted and controlled by the stroke control assembly 4 to enable the product to sequentially detach from the fixed sleeve 24, the core plate 11, the core 23, and the sleeve 22, thereby ensuring that the product can be completely ejected and that each stage of the ejection action is within a predetermined range, thereby avoiding over-ejection or under-ejection.

[0065] The design of the three-stage ejection mechanism not only improves the accuracy and safety of the ejection process, but also significantly enhances production efficiency and product quality, ensuring a smooth demoulding process. Furthermore, the mechanism can adapt to products of different shapes and sizes, thereby enhancing the versatility and flexibility of the mold assembly and making it suitable for the production of a variety of injection molded products.

[0066] Example 2

[0067] Reference Figure 9 The difference between this embodiment and the first embodiment is that a groove 76 is provided at the bottom of the spring block 72, a bearing 77 is rotatably provided in the groove 76, the bearing 77 extends out of the groove 76, and a rolling groove 78 is provided on the fixed seat 71. In this embodiment, the rolling groove 78 is provided along the moving direction of the spring block 72 in and out of the fixed seat 71, and the side of the bearing 77 extending out of the groove 76 is inserted into the rolling groove 78, and the bearing 77 rolls in the rolling groove 78;

[0068] During the demoulding process, as the movable rod 5 moves, the elastic block 72 is driven to move. When the elastic block 72 encounters the extrusion inclined surface 61 of the control rod 6, the extrusion inclined surface 61 presses the matching inclined surface 74, exerting pressure on the elastic block 72 and the spring 73, causing the elastic block 72 to retract into the fixed seat 71. During this process, the elastic block 72 can achieve smoother displacement through the rolling of the bearing 77, so that the elastic block 72 can be retracted into the fixed seat 71 more quickly.

[0069] The design of the bearing 77 can effectively reduce sliding friction, improve the system's movement efficiency, and extend the service life of the component. The design of the bearing 77 also provides better support and stability, ensuring that the spring block 72 will not deviate or get stuck during operation, thereby improving the movement efficiency and reliability of the stroke control component 4 and ensuring a smooth and precise ejection process.

[0070] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A three-stage ejection mechanism for ejecting a product from a mold, wherein the mold comprises a core plate (11) for molding the product; characterized in that: include: A core assembly (2), the core assembly (2) comprising a sleeve needle (21), a sleeve (22), a core (23), and a fixed sleeve (24), one end of the sleeve needle (21), the sleeve (22), the core (23), and the fixed sleeve (24) passing through the core plate (11) to contact the product, and the other end of the core (23) and the fixed sleeve (24) being fixedly arranged; A push plate assembly (3), the other ends of the sleeve (22) and the sleeve needle (21) are fixed on the push plate assembly (3), and the push plate assembly (3) is used to drive the sleeve (22) and the sleeve needle (21) to move; A stroke control component (4) for controlling the movement stroke of the core component (2) and the core plate (11); The push plate assembly (3) is used in conjunction with the stroke control assembly (4) to enable the product to sequentially separate from the fixed sleeve (24), the core plate (11), the core (23), and the sleeve (22).

2. The three-stage ejection mechanism according to claim 1, characterized in that: The push plate assembly (3) includes a first push plate (31) and a second push plate (32), the sleeve needle (21) passes through the second push plate (32) and is connected to the first push plate (31), the sleeve (22) is connected to the second push plate (32), and the first push plate (31) is movably connected to the second push plate (32) and the core plate (11) through the stroke control assembly (4).

3. The three-stage ejection mechanism according to claim 2, characterized in that: The stroke control assembly (4) includes a spring block (7), a movable rod (5) and a control rod (6); the core plate (11) and the second push plate (32) are both provided with the spring block (7); the control rod (6) is fixedly arranged; the movable rod (5) is connected to the first push plate (31) and slides inside the control rod (6); the movable rod (5) is snap-connected with the spring block (7) to drive the spring block (7) to move; and the control rod (6) is used to squeeze the spring block (7) to release the connection between the movable rod (5) and the spring block (7).

4. The three-stage ejection mechanism according to claim 3, characterized in that: The spring block (7) includes a fixed seat (71), a spring block (72) and a spring (73) arranged in the fixed seat (71); the fixed seat (71) is fixed on the core plate (11) or the second push plate (32); one end of the spring (73) is connected to the core plate (11) or the second push plate (32), and the other end is connected to the spring block (72); the spring block (72) slides in the fixed seat (71), and the spring block (72) extends out of the fixed seat (71) and is engaged with the movable rod (5).

5. The three-stage ejection mechanism according to claim 4, characterized in that: The movable rod (5) is provided with a snap-fitting protrusion (51), the snap-fitting protrusion (51) and the elastic block (72) are arranged correspondingly, the snap-fitting protrusion (51) and the elastic block (72) are snap-fitted, and the snap-fitting protrusion (51) and the elastic block (72) are connected via a plane snap-fitting connection.

6. The three-stage ejection mechanism according to claim 5, characterized in that: The control rod (6) is provided with an extrusion bevel (61), and the spring block (72) is provided with a matching bevel (74). The extrusion bevel (61) is used to squeeze the matching bevel (74) so ​​that the spring block (72) is disengaged from the engaging protrusion (51) and retracted into the fixing seat (71).

7. The three-stage ejection mechanism according to claim 6, characterized in that: The engaging protrusion (51) is provided with a reset bevel (52), and the reset bevel (52) is used to press the matching bevel (74) to retract the elastic block (72) into the fixing seat (71), thereby achieving the reset of the movable rod (5).

8. The three-stage ejection mechanism according to claim 4, characterized in that: The outer wall of the elastic block (72) is provided with a clearance groove (75), and the clearance groove (75) is used to prevent the elastic block (72) from getting stuck due to being too tight when moving.

9. The three-stage ejection mechanism according to claim 4, characterized in that: The elastic block (72) is provided with a groove (76), a bearing (77) is rotatably provided in the groove (76), the bearing (77) extends out of the groove (76), a rolling groove (78) is provided on the fixing seat (71), the bearing (77) is inserted into the rolling groove (78) and rolls in the rolling groove (78).

10. An injection mold, characterized in that: It comprises the three-time ejection mechanism as described in any one of claims 1 to 9.

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