A mold ejector mechanism for preventing sticking of injection molded products

Abstract

The utility model belongs to injection mould field, concretely relates to a mould ejector mechanism of preventing injection moulded product from sticking to mould, including lower mould, the top of lower mould is provided with upper mould, the bottom of upper mould extends to the inside of lower mould, the bottom of lower mould is provided with cavity groove, both sides in cavity groove inside are provided with ejector rod, the top of ejector rod penetrates to the inside of lower mould, the bottom of ejector rod is provided with lift mechanism, the utility model discloses add cavity groove etc. Structure on lower mould, make the top of ejector rod can accurate extension to the product forming area inside lower mould, and the distribution of ejector point is even, can effectively avoid the product deformation or ejecting failure problem caused by the stress of single ejector point too big, cavity groove provides independent installation and movement space for ejector rod and lift mechanism, reduces the interference with other components of mould, ensures that the ejecting process is smooth, improves the forming quality and demoulding success rate of injection moulded product.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to a mold ejector mechanism for preventing injection molded products from sticking to the mold. Background Technology

[0002] In the field of injection molding, the ejector mechanism is the core component for product demolding, and its performance directly affects the molding quality, production efficiency, and mold life. Currently, traditional mold ejector mechanisms mostly use a single ejector or a simple ejection structure, resulting in uneven distribution of ejection points and low precision in ejection force control. This can easily lead to sticking of highly viscous injection molding materials or complex products, causing not only difficulty in demolding but also potential scratches, deformation, or even damage to the mold cavity. Some ejector mechanisms lack a reliable automatic reset structure, requiring additional drive devices, which not only increases mold manufacturing costs but also reduces the flexibility and adaptability of the mechanism's operation. Utility Model Content

[0003] The purpose of this utility model is to provide a mold ejector mechanism to prevent injection molded products from sticking to the mold. It solves the problems of traditional mold ejector mechanisms, which mostly use a single ejector or a simple ejector structure. The uneven distribution of ejector points and low precision of ejector force control make it easy for highly viscous injection molding materials or complex products to stick to the mold. This not only makes demolding difficult, but may also cause product scratches, deformation, or even damage to the mold cavity. Some ejector mechanisms lack a reliable automatic reset structure and require an additional drive device, which not only increases the mold manufacturing cost, but also reduces the flexibility and adaptability of the mechanism.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a mold ejector mechanism for preventing injection molded products from sticking to the mold, comprising a lower mold, an upper mold at the top of the lower mold, the bottom of the upper mold extending into the interior of the lower mold, a cavity groove at the bottom of the lower mold, ejector rods on both sides inside the cavity groove, the top of the ejector rods penetrating into the interior of the lower mold, and a lifting mechanism at the bottom of the ejector rods.

[0005] Preferably, the lifting mechanism includes an inclined block, which is fixedly connected to the bottom of the ejector rod. A push rod is provided on the inner side of the inclined block, and a push plate is fixedly connected to the inner side of the push rod. A rotating plate is provided on the inner side of the push plate, and a motor is fixedly connected to the rear side of the rotating plate. The rear side of the motor is fixedly connected to the rear side of the inner wall of the cavity groove. Through the motor, the motor drives the rotating plate to rotate. The rotational motion is converted into the linear motion of the push plate through the cooperation of the rotating plate and the push plate. Then, the push rod transmits the thrust to the inclined block, ultimately driving the ejector rod to move up and down. This power transmission method has high transmission efficiency and low energy loss. It can accurately control the lifting speed and pushing force of the ejector rod. According to the size, weight, and viscosity characteristics of different injection molded products, personalized ejection settings can be achieved by adjusting the motor speed or rotating plate structure parameters. This ensures the reliability of demolding and avoids product damage caused by excessive pushing force, improving the adaptability and practicality of the mechanism.

[0006] Preferably, pulleys are movably connected to both the top and bottom of the rotary plate, and the surface of the pulleys contacts the surface of the push plate. By setting the pulleys, the sliding friction between the rotary plate and the push plate is converted into rolling friction of the pulleys, which greatly reduces the frictional resistance and wear between the two; it reduces energy loss in the power transmission process, makes the lifting action more sensitive and smooth, and avoids the lifting jamming problem caused by excessive frictional resistance; it effectively protects the contact surface of the rotary plate and the push plate, reduces the replacement frequency of components, extends the service life of the entire lifting mechanism, and reduces equipment maintenance costs.

[0007] Preferably, a stabilizing plate is fitted onto the surface of the push rod, and the surface of the stabilizing plate is fixedly connected to the inner wall of the cavity groove. The stabilizing plate provides precise guidance and limiting for the push rod, ensuring that the push rod always maintains a parallel axis during linear movement, avoiding bending, offset, or shaking caused by the push rod's long length or uneven force. This allows the push rod to accurately transmit the thrust to the wedge and the ejector rod, ensuring the consistency of the ejector rod's lifting height and the accuracy of the ejector position, further improving the stability of demolding and the product forming accuracy. It also reduces the additional wear caused by the push rod's offset and extends the service life of the push rod.

[0008] Preferably, a push wheel is provided on the outer side of the push rod, and the surface of the push wheel contacts the surface of the inclined block. By setting the push wheel, the contact mode between the push rod and the inclined block is changed from surface contact to point contact rolling of the push wheel. This not only reduces the frictional resistance between the two, making the thrust transmission smoother and more efficient, but also effectively avoids the problem of the push rod and the inclined block getting stuck due to insufficient surface machining accuracy of the inclined block or long-term wear. At the same time, the push wheel can adapt to the tilt angle of the inclined block, ensuring that the push rod and the inclined block always maintain a good contact state during the lifting process, ensuring the continuity and stability of thrust transmission, and improving the reliability of the lifting mechanism.

[0009] Preferably, the inclined block is internally slidably connected to a vertical rod, which is fixedly connected to both sides inside the cavity groove. The vertical rod provides strict guidance and limitation for the movement direction of the inclined block, ensuring that the inclined block can only slide up and down along the axis of the vertical rod, thus preventing the inclined block from shifting left and right, tilting, or swaying during the force application process. This allows the inclined block to precisely drive the ejector rod to perform vertical lifting and lowering movements, ensuring the positional accuracy of the ejector rod's top ejection point, avoiding product misalignment, deformation, or demolding failure due to ejector rod offset, and improving the ejection stability and reliability of the mechanism.

[0010] Preferably, a spring is fitted onto the surface of the vertical rod. The bottom of the spring is fixedly connected to the bottom of the inner wall of the cavity groove, and the other side of the spring is fixedly connected to the bottom of the inclined block. Through the spring, the elastic restoring force of the spring can quickly pull the inclined block to slide downward along the vertical rod, causing the top rod to automatically reset to the initial position. No additional reset drive device is required, which simplifies the overall structure of the mechanism and reduces the manufacturing cost of the equipment. At the same time, the buffering effect of the spring can also absorb the impact force during the lifting and reset of the top rod, reduce rigid collisions between components, reduce noise and wear, extend the service life of the mechanism, and the preload of the spring can be adjusted according to actual needs, further improving the adaptability of the mechanism.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model, by adding a cavity groove and other structures to the lower mold, enables the top of the ejector rod to extend precisely into the product molding area inside the lower mold, and the ejector points are evenly distributed, which can effectively avoid product deformation or ejector failure caused by excessive force on a single ejector point; at the same time, the cavity groove provides independent installation and movement space for the ejector rod and the lifting mechanism, reducing interference with other parts of the mold, ensuring a smooth and stable ejection process, and improving the molding quality and demolding success rate of injection molded products.

[0012] 2. This utility model, by adding a push rod and other structures to the lower mold, can quickly and evenly separate the molded product from the mold cavity through the stable pushing force provided by the lifting mechanism, avoiding demolding difficulties, product scratches, or mold damage caused by product sticking to the mold. Compared with traditional demolding methods, this mechanism does not require additional manual assistance for peeling, shortens the demolding cycle, and significantly improves production efficiency. It is especially suitable for injection molding materials with strong adhesion or injection molding products with complex structures. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a three-dimensional cross-sectional view of the lower mold of this utility model; Figure 3This is a perspective view of the top material rod of this utility model.

[0014] In the diagram: 1. Lower mold; 2. Upper mold; 3. Cavity groove; 4. Ejector rod; 51. Inclined block; 52. Push rod; 53. Push plate; 54. Rotary plate; 55. Motor; 56. Pulley; 57. Stabilizing plate; 58. Push wheel; 6. Vertical rod; 7. Spring. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1 A mold ejector mechanism for preventing injection molded products from sticking to the mold includes a lower mold 1, an upper mold 2 is provided on the top of the lower mold 1, the bottom of the upper mold 2 extends into the interior of the lower mold 1, a cavity groove 3 is provided on the bottom of the lower mold 1, ejector rods 4 are provided on both sides inside the cavity groove 3, the top of the ejector rods 4 penetrates into the interior of the lower mold 1, and a lifting mechanism is provided at the bottom of the ejector rods 4.

[0017] Please see Figure 1 - The lifting mechanism includes an inclined block 51, which is fixedly connected to the bottom of the top material rod 4. A push rod 52 is provided on the inner side of the inclined block 51. A push plate 53 is fixedly connected on the inner side of the push rod 52. A rotating plate 54 is provided on the inner side of the push plate 53. A motor 55 is fixedly connected to the rear side of the rotating plate 54. The rear side of the motor 55 is fixedly connected to the rear side of the inner wall of the cavity groove 3.

[0018] Furthermore, through the setting of motor 55, motor 55 drives the rotating plate 54 to rotate. Through the cooperation of rotating plate 54 and push plate 53, the rotational motion is converted into the linear motion of push plate 53. Then, push rod 52 transmits the thrust to inclined block 51, which finally drives the ejector rod 4 to move up and down. This power transmission method has high transmission efficiency and low energy loss. It can accurately control the lifting speed and pushing force of ejector rod 4. According to the size, weight and viscosity characteristics of different injection molded products, personalized ejection settings can be achieved by adjusting the speed of motor 55 or the structural parameters of rotating plate 54. This ensures the reliability of demolding and avoids product damage caused by excessive pushing force, thus improving the adaptability and practicality of the mechanism.

[0019] Please see Figure 3 Both the top and bottom of the rotary plate 54 are movably connected to pulleys 56, and the surface of the pulleys 56 is in contact with the surface of the push plate 53.

[0020] Furthermore, by setting up pulley 56, the sliding friction between the rotary plate 54 and the push plate 53 is converted into the rolling friction of the pulley 56, which greatly reduces the frictional resistance and wear between the two; reduces energy loss in the power transmission process, makes the lifting action more sensitive and smooth, and avoids the lifting jamming problem caused by excessive frictional resistance; effectively protects the contact surface of the rotary plate 54 and the push plate 53, reduces the replacement frequency of parts, extends the service life of the entire lifting mechanism, and reduces equipment maintenance costs.

[0021] Please see Figure 3 A stabilizing plate 57 is fitted onto the surface of the push rod 52, and the surface of the stabilizing plate 57 is fixedly connected to the inner wall of the cavity groove 3.

[0022] Furthermore, the stabilizing plate 57 provides precise guidance and limiting for the push rod 52, ensuring that the push rod 52 remains parallel to its axis during linear movement. This prevents the push rod 52 from bending, deviating, or wobbling due to its long length or uneven force. This allows the push rod 52 to accurately transmit the thrust to the inclined block 51 and the ejector rod 4, ensuring the consistency of the ejector rod 4's lifting height and the accuracy of the ejector position. This further improves the stability of demolding and the product forming accuracy, while also reducing the additional wear caused by the push rod 52's deviation and extending its service life.

[0023] Please see Figure 3 A push wheel 58 is provided on the outer side of the push rod 52, and the surface of the push wheel 58 is in contact with the surface of the inclined block 51.

[0024] Furthermore, by setting the push wheel 58, the contact mode between the push rod 52 and the inclined block 51 is changed from surface contact to point contact rolling of the push wheel 58. This not only reduces the frictional resistance between the two, making the thrust transmission smoother and more efficient, but also effectively avoids the problem of the push rod 52 and the inclined block 51 getting stuck due to insufficient surface machining accuracy of the inclined block 51 or long-term wear. At the same time, the push wheel 58 can adapt to the tilt angle of the inclined block 51, ensuring that the push rod 52 and the inclined block 51 always maintain a good contact state during the lifting process, ensuring the continuity and stability of thrust transmission, and improving the reliability of the lifting mechanism.

[0025] Please see Figure 3 The inclined block 51 has a vertical rod 6 that is slidably connected inside, and the vertical rod 6 is fixedly connected to both sides inside the cavity groove 3.

[0026] Furthermore, the vertical rod 6 provides strict guidance and limitation for the movement direction of the inclined block 51, ensuring that the inclined block 51 can only slide up and down along the axis of the vertical rod 6, thus preventing the inclined block 51 from shifting left and right, tilting, or swaying during the force application process. This allows the inclined block 51 to precisely drive the ejector rod 4 to perform vertical lifting and lowering movements, ensuring the positional accuracy of the ejector point at the top of the ejector rod 4, and preventing product misalignment, deformation, or demolding failure caused by the offset of the ejector rod 4, thereby improving the ejector stability and reliability of the mechanism.

[0027] Please see Figure 3 A spring 7 is fitted on the surface of the vertical rod 6. The bottom of the spring 7 is fixedly connected to the bottom of the inner wall of the cavity groove 3, and the other side of the spring 7 is fixedly connected to the bottom of the inclined block 51.

[0028] Furthermore, through the setting of spring 7, the elastic restoring force of spring 7 can quickly pull the inclined block 51 to slide down along the vertical rod 6, causing the top rod 4 to automatically reset to the initial position. There is no need to set up an additional reset drive device, which simplifies the overall structure of the mechanism and reduces the manufacturing cost of the equipment. At the same time, the buffering effect of spring 7 can also absorb the impact force during the lifting and reset of the top rod 4, reduce rigid collisions between components, reduce noise and wear, and extend the service life of the mechanism. Moreover, the preload of spring 7 can be adjusted according to actual needs, further improving the adaptability of the mechanism.

[0029] The specific implementation process of this utility model is as follows: When in use, after the lower mold 1 and the upper mold 2 are closed, the material is injected into the interior of the lower mold 1 through the injection hole at the top of the upper mold 2. Then, the lower mold 1 and the upper mold 2 form the material. After the material is formed, the upper mold 2 exits from the interior of the lower mold 1. At this time, the product is located inside the lower mold 1 and is difficult to remove. When it is necessary to remove the product from the lower mold 1, start the motor 55. The motor 55 drives the rotating plate 54 to rotate. When the roller 56 rotates, and the roller 56 moves to the horizontal position, it can push the push plates 53 on both sides. The push plates 53 drive the push rod 52 and the push wheel 58 to move to both sides. The push wheel 58 drives the inclined block 51 to move upward. The inclined block 51 drives the ejector rod 4 to move upward. The ejector rod 4 lifts the product from the lower mold 1.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mold ejector mechanism for preventing injection molded products from sticking to the mold, comprising a lower mold (1), characterized in that: The lower mold (1) is provided with an upper mold (2) at its top. The bottom of the upper mold (2) extends into the interior of the lower mold (1). The bottom of the lower mold (1) is provided with a cavity groove (3). Both sides of the cavity groove (3) are provided with ejector rods (4). The top of the ejector rods (4) penetrates into the interior of the lower mold (1). The bottom of the ejector rods (4) is provided with a lifting mechanism.

2. The mold ejector mechanism for preventing injection molded products from sticking to the mold according to claim 1, characterized in that: The lifting mechanism includes an inclined block (51), which is fixedly connected to the bottom of the top material rod (4). A push rod (52) is provided on the inner side of the inclined block (51). A push plate (53) is fixedly connected on the inner side of the push rod (52). A rotating plate (54) is provided on the inner side of the push plate (53). A motor (55) is fixedly connected to the rear side of the rotating plate (54). The rear side of the motor (55) is fixedly connected to the rear side of the inner wall of the cavity groove (3).

3. The mold ejector mechanism for preventing injection molded products from sticking to the mold according to claim 2, characterized in that: The top and bottom of the rotating plate (54) are movably connected to pulleys (56), and the surface of the pulleys (56) is in contact with the surface of the push plate (53).

4. The mold ejector mechanism for preventing injection molded products from sticking to the mold according to claim 2, characterized in that: The surface of the push rod (52) is fitted with a stabilizing plate (57), and the surface of the stabilizing plate (57) is fixedly connected to the inner wall of the cavity groove (3).

5. A mold ejector mechanism for preventing injection molded products from sticking to the mold according to claim 2, characterized in that: A push wheel (58) is provided on the outer side of the push rod (52), and the surface of the push wheel (58) is in contact with the surface of the inclined block (51).

6. A mold ejector mechanism for preventing injection molded products from sticking to the mold according to claim 2, characterized in that: The inclined block (51) is slidably connected to a vertical rod (6), which is fixedly connected to both sides inside the cavity groove (3).

7. A mold ejector mechanism for preventing injection molded products from sticking to the mold according to claim 6, characterized in that: A spring (7) is fitted on the surface of the vertical rod (6). The bottom of the spring (7) is fixedly connected to the bottom of the inner wall of the cavity groove (3), and the other side of the spring (7) is fixedly connected to the bottom of the inclined block (51).

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