Ejection mechanism for injection moulds

Abstract

The utility model relates to injection mold technical field discloses a kind of ejection mechanism of injection mold, including pressure plate, telescopic push column connected with power mechanism is equipped on pressure plate, push column is connected with push plate, and push plate is equipped with fixed plate, and fixed plate four corners are connected with movable mould by slide column, and one side of movable mould is equipped with fixed mould, and fixed mould is connected with material conveying pipe.Compared with prior art, the advantages are that: through the uniform distribution of the multiple ejector rods of demoulding unit, the buffering action of the combination of ejector block and telescopic spring is realized, the ejection force is balanced, the deformation, cracking or sticking mold caused by local excessive stress of plastic parts is effectively avoided, the product pass rate is improved;The telescopic groove of push plate and fixed plate is slidably connected with convex column, the abutment of top column and convex column triggers demolding action, ensures the power transmission of push column and the action synchronization of demoulding unit, improves the coordination and efficiency of ejection, avoids ejection lag or over-ejection.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an ejection mechanism for an injection mold. Background Technology

[0002] In the injection molding process, the ejection efficiency and stability after mold opening directly affect the production schedule. Meanwhile, the uniformity of ejection force and the timeliness of part cooling also affect product molding quality and ejection safety. Existing injection mold ejection mechanisms typically suffer from the following problems:

[0003] Traditional ejection mechanisms often rely on a single ejector pin or a simple push plate structure, which can lead to uneven distribution of ejection force, resulting in deformation, cracking, or sticking of the plastic part, increasing the scrap rate. The coordination between the demolding components and the power mechanism is poor, and the push pin's stroke is not synchronized with the demolding unit's movement, which can easily lead to delayed or excessive ejection, affecting ejection efficiency. In addition, after the moving mold and fixed mold are closed for injection molding, the plastic part cools down slowly. If ejection is started before it is fully formed, it can easily lead to damage to the plastic part. The waiting process for cooling will prolong the production cycle, making it difficult to meet the needs of efficient and stable injection molding production. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the existing ejection mechanism of injection mold has problems such as uneven ejection force, which easily leads to deformation or sticking of plastic parts; poor coordination between the demolding unit and the power mechanism, which affects the ejection efficiency; and untimely cooling of plastic parts, which delays the ejection time and affects the molding quality. The present invention aims to achieve balanced ejection force, improve the coordination accuracy between the demolding unit and the power mechanism, and accelerate the cooling of plastic parts to optimize the ejection process, thereby improving ejection efficiency and molding quality of plastic parts.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] An ejection mechanism for an injection mold includes a pressure plate, a push column connected to a power mechanism that is telescopically mounted on the pressure plate, a push plate connected to the push column, a fixed plate on the push plate, a moving mold connected to the four corners of the fixed plate via sliding columns, a fixed mold on one side of the moving mold, and a material conveying pipe connected to the fixed mold.

[0007] The pressure plate is provided with a protruding post, and a demolding unit is provided between the moving mold and the fixed plate. The demolding unit cooperates with the protruding post to eject the plastic part formed between the moving mold and the fixed mold and separate it.

[0008] The moving mold is equipped with a cooling unit, which is connected to a liquid cooling mechanism to cool and lower the temperature of the plastic part between the moving mold and the fixed mold until it is formed.

[0009] As an improvement, a movable plate is fixed to the fixed plate, and a top post is provided on the side of the movable plate facing the protruding post. Both the push plate and the fixed plate have telescopic grooves in the middle that slide with the protruding post. The telescopic grooves provide sliding space for the protruding post, ensuring that the protruding post can slide stably along the telescopic grooves when the push post pushes the push plate and the fixed plate to move. At the same time, the cooperation between the top post and the protruding post can trigger the precise action of the demolding unit.

[0010] As an improvement, the demolding unit includes a fixed column fixed between the fixed plate and the moving mold, and the fixed column is slidably connected to the moving plate, providing a sliding guide for the moving plate; the moving plate is provided with several ejector rods, the other end of which extends to the end of the moving mold and is slidably connected to the moving mold, and the multiple ejector rods are evenly distributed to achieve balanced ejection; ejector blocks are slidably provided on the rods near the moving plate and the moving mold, and telescopic springs are connected between the ejector blocks, which can buffer the ejection force and avoid excessive ejection that could damage the plastic part.

[0011] As an improvement, the moving mold is provided with a protrusion for molding the plastic part. The protrusion and the fixed mold cooperate to form a complete injection cavity. When the protrusion and the ejector pin abut against each other until the telescopic spring is compressed to its shortest length, the plastic part falls freely off the moving mold. The ejection limit is limited by the compression stroke of the telescopic spring to ensure that the plastic part just detaches and does not collide with the moving mold.

[0012] As an improvement, the cooling unit includes a cooling pipe connector located on one side of the moving mold. The moving mold has a cooling cavity that surrounds the shape of the molded part. The cooling cavity is connected to the cooling pipe connector and extends from the other side to connect to the liquid cooling mechanism, forming a cooling circulation loop. The surrounding cooling cavity allows the coolant to evenly coat the molded part, accelerating the cooling speed. Simultaneously, the circulation loop ensures continuous coolant flow, maintaining a stable cooling effect.

[0013] The advantages of this utility model compared with the prior art are as follows:

[0014] 1. This utility model achieves balanced ejection force by evenly distributing multiple ejector rods in the demolding unit, combined with the buffering effect of the ejector block and the telescopic spring. This effectively avoids deformation, cracking or sticking to the mold caused by excessive local force on the plastic parts, thereby improving the product qualification rate.

[0015] 2. The telescopic grooves of the push plate and the fixed plate of this utility model slide with the protrusion, and the contact between the push post and the protrusion triggers the demolding action, ensuring that the power transmission of the push post is synchronized with the action of the demolding unit, improving the ejection coordination and efficiency, and avoiding ejection lag or over-ejection.

[0016] 3. The surrounding cooling chamber of the cooling unit of this utility model forms a circulating cooling circuit, which can quickly and evenly cool the plastic parts, ensure timely molding of the plastic parts, shorten the production cycle of waiting for cooling, and improve the molding quality of the plastic parts. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the appearance of this utility model.

[0018] Figure 2 This is an exploded schematic diagram of this utility model.

[0019] Figure 3 This is a cross-sectional view of some components of this utility model. Figure 1 .

[0020] Figure 4 This is a cross-sectional view of some components of this utility model. Figure 2 .

[0021] As shown in the figure: 1. Pressure plate; 2. Push column; 21. Push plate; 3. Fixed plate; 4. Sliding column; 5. Moving mold; 6. Fixed mold; 7. Material conveying pipe; 8. Protruding column; 9. Demolding unit; 91. Fixed column; 92. Ejector rod; 93. Ejector block; 94. Telescopic spring; 10. Cooling unit; 101. Cooling pipe joint; 102. Cooling chamber; 11. Moving plate; 12. Ejector column; 13. Telescopic groove; 14. Protrusion. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] Please see the appendix Figure 1 Appendix Figure 2 As shown, an injection mold for easy part removal includes a pressure plate 1 providing a support base for the overall structure. A pusher 2 is vertically mounted on the upper surface of the pressure plate 1, with its bottom end fixedly connected to the output end of an external power mechanism (such as a hydraulic cylinder) and its top end welded to the pusher plate 21. A fixing plate 3 is bolted to the upper surface of the pusher plate 21. The top ends of the sliding columns 4 at the four corners of the fixing plate 3 are bolted to the moving mold 5. The sliding columns 4 ensure that the moving mold 5 remains horizontal when it rises and falls with the fixing plate 3, preventing deviation. A fixed mold 6 is mounted on a frame on one side of the moving mold 5 (the frame is not marked in the figure). When the fixed mold 6 and the moving mold 5 are in contact, the groove of the fixed mold 6 and the protrusion 14 of the moving mold 5 form a molding cavity for injection molding. A material conveying pipe 7 passes through the fixed mold 6 and communicates with the molding cavity to convey molten raw materials.

[0024] A protruding post 8 is welded to the middle of the upper surface of the pressure plate 1. The push plate 21 and the telescopic groove 13 in the middle of the fixed plate 3 are sleeved on the outside of the protruding post 8, and the protruding post 8 can slide along the telescopic groove 13. A movable plate 11 is welded to the side of the upper surface of the fixed plate 3 away from the fixed mold 6. A top post 12 is welded to the side of the movable plate 11 facing the protruding post 8. The top post 12 is coaxially set with the protruding post 8 to ensure that they can accurately abut against each other in the future.

[0025] See appendix Figure 2 Appendix Figure 3As shown, the fixed column 91 of the demolding unit 9 is welded and fixed to the fixed plate 3 and the moving mold 5 at both ends respectively. The moving plate 11 is provided with sliding holes adapted to the fixed column 91, and the moving plate 11 can slide vertically along the fixed column 91. Three to four push rods 92 (evenly distributed around the circumference of the protrusion 14) are welded to the side of the moving plate 11 facing the moving mold 5. The push rods 92 pass through the through hole of the moving mold 5 and extend to the inner wall of the molding cavity. The push rods 92 slide with the through hole of the moving mold 5. The two push blocks 93 on the push rods 92 are respectively attached to the sides of the moving plate 11 and the moving mold 5. The telescopic spring 94 is sleeved on the outside of the push rod 92 and its two ends are welded to the push blocks 93. In the initial state, the telescopic spring 94 is in a naturally extended state.

[0026] See appendix Figure 2 Appendix Figure 4 As shown, the cooling pipe connector 101 of the cooling unit 10 is fixed to the outer wall of one side of the moving mold 5 by threads. The cooling cavity 102 inside the moving mold 5 is annularly surrounding the protrusion 14. The inlet of the cooling cavity 102 is connected to the cooling pipe connector 101, and the outlet is connected to the return port of the external liquid cooling mechanism through another pipe. The outlet of the liquid cooling mechanism is connected to the cooling pipe connector 101 through a pipe, forming a coolant circulation loop.

[0027] In specific implementation of this utility model: during the mold closing and injection molding stage: the external power mechanism drives the push column 2 to descend, the push plate 21 and the fixed plate 3 descend with the push column 2, and the sliding column 4 drives the moving mold 5 to approach the fixed mold 6 until the moving mold 5 and the fixed mold 6 are tightly fitted (mold closing state); the external injection molding machine injects molten raw material into the molding cavity (formed by the protrusion 14 of the moving mold 5 and the groove of the fixed mold 6) through the material delivery pipe 7, and at the same time starts the liquid cooling mechanism. The coolant enters the cooling cavity 102 through the cooling pipe joint 101, circulates around the molding part, and cools the molding part until the molding part is completely solidified and formed.

[0028] During the mold opening and moving stage: After the mold opening and moving stage, the ejection and demolding stage begins: After the plastic part is formed, the external power mechanism drives the pusher 2 to rise, and the pusher plate 21 and the fixed plate 3 rise with the pusher 2. The sliding column 4 drives the moving mold 5 to separate from the fixed mold 6 (mold opening); During the continuous rising process, the moving plate 11 on the fixed plate 3 drives the ejector 12 to rise synchronously. When the ejector 12 abuts against the top of the protrusion 8, the moving plate 11 can no longer rise, while the fixed plate 3 continues to rise under the drive of the pusher 2. At this time, the moving plate 11 slides down along the fixed column 91 relative to the fixed plate 3. The moving plate 11 pushes the ejector 92 to move towards the plastic cavity. The top of the ejector 92 contacts the plastic part and pushes it; At the same time, the ejector block 93 on the ejector 92 compresses the telescopic spring 94. The telescopic spring 94 provides buffer force to prevent the plastic part from being deformed due to excessive force; When the telescopic spring 94 is compressed to its shortest length, the ejector 92 completely ejects the plastic part from the surface of the protrusion 14 of the moving mold 5, and the plastic part falls freely, completing the demolding;

[0029] During the reset preparation stage: After the plastic part is detached, the external power mechanism drives the push column 2 to descend, the push plate 21 and the fixed plate 3 descend with the push column 2, the top column 12 separates from the protrusion 8, the telescopic spring 94 returns to its natural extension state, and drives the push rod 92 and the moving plate 11 to reset; the moving mold 5 continues to descend with the fixed plate 3 to the initial position, ready for the next mold closing injection cycle.

[0030] If different specifications of molded parts need to be adapted, simply disassemble the moving mold 5, replace it with a moving mold 5 with a corresponding specification protrusion 14, and ensure that the cooling cavity 102 is compatible with the protrusion 14 of the new moving mold 5. There is no need to adjust the ejection mechanism and other parts of the cooling unit 10. It is easy to operate and highly versatile.

[0031] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An ejection mechanism for an injection mold, comprising a pressure plate (1), characterized in that: The pressure plate (1) is provided with a push column (2) that is connected to the power mechanism. The push column (2) is connected to a push plate (21). The push plate (21) is provided with a fixed plate (3). The four corners of the fixed plate (3) are connected to a moving mold (5) through a sliding column (4). A fixed mold (6) is provided on one side of the moving mold (5). A material conveying pipe (7) is connected to the fixed mold (6). The pressure plate (1) is provided with a protrusion (8), and a demolding unit (9) is provided between the moving mold (5) and the fixed plate (3). The demolding unit (9) cooperates with the protrusion (8) to eject the plastic part formed between the moving mold (5) and the fixed mold (6). The moving mold (5) is provided with a cooling unit (10), which is connected to a liquid cooling mechanism to cool and reduce the temperature of the plastic part between the moving mold (5) and the fixed mold (6) until it is formed.

2. The ejection mechanism of an injection mold according to claim 1, characterized in that: A movable plate (11) is fixed on the fixed plate (3). A top column (12) is provided on the side of the movable plate (11) facing the protrusion (8). Both the push plate (21) and the fixed plate (3) are provided with a telescopic groove (13) that is slidably connected to the protrusion (8).

3. The ejection mechanism of an injection mold according to claim 2, characterized in that: The demolding unit (9) includes a fixed column (91) fixed between the fixed plate (3) and the moving mold (5), and the fixed column (91) is slidably connected to the moving plate (11). The moving plate (11) is provided with a plurality of push rods (92). The other end of the push rod (92) extends to the end of the moving mold (5) and is slidably connected to the moving mold (5). The push rod (92) is slidably provided with a push block (93) on the rod body near the moving plate (11) and the moving mold (5). A telescopic spring (94) is connected between the push blocks (93).

4. The ejection mechanism of an injection mold according to claim 2, characterized in that: The moving mold (5) is provided with a protrusion (14) for forming the plastic part. When the protrusion (8) and the top post (12) abut against each other until the telescopic spring (94) is compressed to its shortest length, the plastic part falls freely off the moving mold (5).

5. The ejection mechanism of an injection mold according to claim 1, characterized in that: The cooling unit (10) includes a cooling pipe joint (101) disposed on one side of the moving mold (5). The moving mold (5) is provided with a cooling cavity (102) surrounding the shape of the plastic part of the moving mold (5). The cooling cavity (102) is connected to the cooling pipe joint (101) and extends out from the other side to connect with the liquid cooling mechanism to form a cooling circulation loop.

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