Ejection device for injection-moulding tools

Abstract

This utility model discloses an ejection device for injection molds, including a moving mold body. A cavity is provided on one side of the moving mold body, and a top cover is provided on the top of the moving mold body. A mounting plate is fixed to one side of the inner wall of the moving mold body, and a hydraulic cylinder is provided on the inner wall of the mounting plate. A telescopic plate is fixedly connected to the telescopic end of the hydraulic cylinder. A guide post is fixedly connected to one side of the inner wall of the moving mold body, and the outer wall of the guide post is sleeved with the telescopic plate. An ejection mechanism is provided on one side of the telescopic plate, and a connecting plate is fixedly connected to one side of the ejection mechanism, with the connecting plate sleeved on the outer wall of the guide post. A limiting mechanism is provided on one side of the ejection mechanism. A sleeve is fixed to one side of the telescopic plate, and a pusher is slidably connected to the inner wall of the sleeve. This utility model uses a slow initial ejection by the ejection mechanism to allow the injection molded part to initially leave the cavity, followed by a secondary accelerated ejection, thereby reducing the ejection time per cycle and improving production efficiency. Furthermore, the limiting mechanism prevents excessive ejection that could lead to deformation of the injection molded part.

Description

Technical Field

[0001] This utility model relates to the field of injection molding ejection technology, and in particular to an ejection device for injection molds used in injection molding parts. Background Technology

[0002] In the existing technology, the ejection device of the injection mold is the core functional component responsible for demolding in the injection molding cycle. Its main function is to eject the mold with a stable and uniform ejection force and a reasonable ejection path after the mold has completed melt filling, pressure holding and cooling. This is achieved through actuators such as ejector pins, ejector plates, ejector tubes and push blocks, under the power drive of the injection molding machine's mold clamping system (such as hydraulic or mechanical transmission).

[0003] A search revealed a utility model patent with Chinese patent publication number CN217514462U, which discloses an ejection device for injection molded parts. This device includes a first and second support that can slide relative to each other, and a power mechanism for driving the first and second supports to slide relative to each other. The first support has at least one core post penetrating the second support, and the end of the core post has a molding core surface forming the inner wall of the injection molded part. A stop surface is located on the side of the second support away from the first support. When demolding is required, the stop surface moves towards the end of the core post, ejecting the injection molded part from the molding core surface. While this utility model features a simple and compact overall structure, easy and convenient operation, and the ability to automatically demold difficult-to-demold injection molded products, exhibiting high reliability and long service life, its single ejection method is problematic. For deep-cavity products such as boxes or barrels with significant depth, the initial ejection stage already significantly reduces the product's clamping force, while the subsequent ejection stage maintains the original speed, resulting in a prolonged overall ejection time. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing an ejection device for injection molds used in injection molding.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An ejection device for an injection mold for injection molded parts includes a moving mold body, a cavity on one side of the moving mold body, an mounting plate fixed on one side of the inner wall of the moving mold body, a hydraulic cylinder on the inner wall of the mounting plate, a telescopic plate fixedly connected to the telescopic end of the hydraulic cylinder, an ejection mechanism on one side of the telescopic plate, a connecting plate fixedly connected to one side of the ejection mechanism, a guide post sleeved on the outer wall of the connecting plate, and a limit mechanism on one side of the ejection mechanism.

[0006] As a further embodiment of this utility model: the top of the moving mold body is provided with a top cover, the guide column is fixedly connected to one side of the inner wall of the moving mold body, and the outer wall of the guide column is sleeved with the telescopic plate.

[0007] As a further embodiment of this utility model: the ejection mechanism includes a bracket, a rocker plate, a sleeve, an ejector pin, a baffle, a push plate, a spring, and a telescopic rod, and the sleeve is fixed to one side of the telescopic plate.

[0008] As a further embodiment of this utility model: the push plate is slidably connected to the inner wall of the sleeve, one end of the spring is fixed to one side of the push plate, and the other end of the spring is fixedly connected to one side of the inner wall of the sleeve, the telescopic rod is welded to one side of the push plate, and a connecting plate is fixedly connected to one side of the telescopic rod.

[0009] As a further embodiment of this utility model: the bracket is fixed to one side of the telescopic plate, the rocker plate is rotatably connected to both sides of the inner wall of the bracket, the ejector pin is fixed to the other side of the connecting plate, and the baffle is installed on the inner wall of the moving mold body on the side away from the mounting plate.

[0010] As a further embodiment of this utility model: the limiting mechanism includes a limiting plate, a slider, a limiting switch and a screw. The limiting plate is fixed to the outer surface of the baffle. A scale is provided on one side of the limiting plate, and a groove is provided on one side of the limiting plate.

[0011] As a further embodiment of this utility model: the slider is slidably connected to the inner wall of the groove opened in the limiting plate, the limit switch is installed on the inner wall of the slider, the screw is rotatably connected to one side of the baffle, and the screw and the slider are connected by threads.

[0012] Compared with the prior art, the present invention provides an ejection device for injection molds for injection molded parts, which has the following advantages: When the injection molded part needs to be ejected, the hydraulic cylinder is activated, pushing the telescopic plate to move along the guide post towards the cavity. This, in turn, drives the ejection mechanism and the connecting plate to move synchronously. The ejection mechanism begins to contact and push the product. The ejection mechanism first slowly pushes the product, allowing it to gradually detach from the inner wall of the cavity. As the movement continues, the ejection mechanism triggers a second acceleration ejection to push the product out of the cavity completely at a faster speed. After ejection is complete, the connecting plate contacts the limiting mechanism, which stops the hydraulic cylinder from extending and retracts. Thus, by first slowly ejecting the injection molded part to initially detach it from the cavity and then accelerating it a second time, the ejection time per ejection is reduced, improving production efficiency. In addition, the limiting mechanism can prevent excessive ejection that could cause deformation of the injection molded part.

[0013] When the molded part is ejected, the telescopic end of the hydraulic cylinder extends outward, pushing the telescopic plate along the guide post towards the cavity. At this time, the sleeve, connecting plate, and ejector pin move synchronously. The ejector pin gradually passes through the cavity, and the ejector pin initially ejects the molded part. The reaction force of the ejector pin is transmitted to the telescopic rod, causing the push plate to press tightly against the inner wall of the sleeve. With the continuous displacement of the telescopic plate, the rocker plate gradually approaches the baffle. When one end of the rocker plate contacts the baffle, the rocker plate rotates around the bracket connection point, thereby triggering a secondary acceleration ejection. At this time, the other end of the rocker plate contacts the connecting plate and pushes the connecting plate. The displacement occurs simultaneously with the connecting plate moving along the outer wall of the guide post. At this time, the telescopic rod moves synchronously with the connecting plate, slides on the inner wall of the sleeve, and drives the push plate to squeeze the spring. At the same time, the ejector pin suddenly accelerates, causing the product to completely detach from the cavity. Thus, the initial slow ejection of the injection molded part can prevent the barrel product from cracking due to excessive local stress. After the injection molded part initially detaches from the cavity, it undergoes a second acceleration ejection. At this time, the clamping force between the product and the cavity has been greatly reduced. The acceleration force will not cause surface scratches on the product and can also reduce the time of a single ejection, thereby increasing production efficiency.

[0014] Depending on the product's depth, the screw is rotated. At this time, the slider is affected by the thread, but the slider is slidably connected to the groove of the limiting plate. Under this restriction, the slider's rotation is limited, thus converting the screw's rotational motion into the limiting plate's translational motion. This causes the slider to slide along the inner wall of the groove opened on the limiting plate, and the distance can be observed and adjusted according to the scale. When the ejection mechanism enters the secondary ejection stage, the connecting plate drives the ejector pin to extend out of the cavity. As the connecting plate continues to move, its edge gradually approaches the limit switch. Then, the limit switch sends a signal to the external controller of the hydraulic cylinder, causing it to retract. The retraction of the hydraulic cylinder drives the telescopic plate, connecting plate, and ejector pin to move in the opposite direction. This prevents the ejector pin from extending excessively, which could cause the injection molded part to dent or deform, thereby improving the product's pass rate.

[0015] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model has a simple structure and is easy to operate. Attached Figure Description

[0016] Figure 1 This is a front view of an injection mold ejection device for injection molded parts proposed in this utility model; Figure 2 This is a cross-sectional view of an injection mold ejection device for injection molded parts proposed in this utility model; Figure 3 This is a schematic diagram of the ejection mechanism in an ejection device for injection molds of injection molded parts, as proposed in this utility model. Figure 4 This is a partial sectional view of the ejection mechanism in an ejection device for injection molds of injection molded parts, as proposed in this utility model. Figure 5This is a schematic diagram of the limiting mechanism in the ejection device of an injection mold for injection molded parts proposed in this utility model.

[0017] In the diagram: 1. Moving mold body; 2. Cavity; 3. Mounting plate; 4. Hydraulic cylinder; 5. Guide pillar; 6. Telescopic plate; 7. Connecting plate; 8. Ejection mechanism; 9. Limiting mechanism; 801. Bracket; 802. Rocker; 803. Sleeve; 804. Ejector pin; 805. Baffle; 806. Push plate; 807. Spring; 808. Telescopic rod; 901. Limiting plate; 902. Slider; 903. Limit switch; 904. Screw. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] An ejection device for injection molded parts, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the device includes a moving mold body 1, a cavity 2 on one side of the moving mold body 1, a top cover on the top of the moving mold body 1, an mounting plate 3 fixed on one side of the inner wall of the moving mold body 1, a hydraulic cylinder 4 on the inner wall of the mounting plate 3, a telescopic plate 6 fixedly connected to the telescopic end of the hydraulic cylinder 4, a guide post 5 fixedly connected to one side of the inner wall of the moving mold body 1, and the outer wall of the guide post 5 sleeved with the telescopic plate 6, an ejection mechanism 8 on one side of the telescopic plate 6, a connecting plate 7 fixedly connected to one side of the ejection mechanism 8, and the connecting plate 7 sleeved with the outer wall of the guide post 5, and a limit mechanism 9 on one side of the ejection mechanism 8.

[0022] When the injection molded part needs to be ejected, the hydraulic cylinder 4 is activated, pushing the telescopic plate 6 to move along the guide post 5 towards the cavity 2, thereby driving the ejection mechanism 8 and the connecting plate 7 to move synchronously. The ejection mechanism 8 begins to contact and push the product. The ejection mechanism 8 first slowly pushes the product, allowing the product to gradually detach from the inner wall of the cavity 2. With continuous movement, the ejection mechanism 8 triggers a second acceleration ejection, pushing the product out of the cavity 2 completely at a faster speed. After ejection is completed, the connecting plate 7 contacts the limiting mechanism 9, which causes the hydraulic cylinder 4 to stop extending and retract. Thus, by first slowly ejecting the injection molded part and then accelerating it a second time, the ejection time per ejection is reduced, improving production efficiency. In addition, the limiting mechanism 9 can prevent excessive ejection from causing deformation of the injection molded part.

[0023] To improve the ejection efficiency of deep-cavity products such as box-shaped or barrel-shaped products with greater depth, such as Figure 3 and Figure 4 As shown, the ejection mechanism 8 includes a bracket 801, a rocker plate 802, a sleeve 803, an ejector pin 804, a baffle 805, a push plate 806, a spring 807, and a telescopic rod 808. The sleeve 803 is fixed to one side of the telescopic plate 6, the push plate 806 is slidably connected to the inner wall of the sleeve 803, one end of the spring 807 is fixed to one side of the push plate 806, and the other end of the spring 807 is fixedly connected to one side of the inner wall of the sleeve 803. The telescopic rod 808 is welded to one side of the push plate 806, and a connecting plate 7 is fixedly connected to one side of the telescopic rod 808. The bracket 801 is fixed to one side of the telescopic plate 6, the rocker plate 802 is rotatably connected to both sides of the inner wall of the bracket 801, the ejector pin 804 is fixed to the other side of the connecting plate 7, and the baffle 805 is installed on the inner wall of the moving mold body 1 on the side away from the mounting plate 3.

[0024] When the injection molded part is ejected, the telescopic end of the hydraulic cylinder 4 extends outward, pushing the telescopic plate 6 to move along the guide post 5 towards the cavity 2. At this time, the sleeve 803, connecting plate 7, and ejector pin 804 move synchronously. The ejector pin 804 gradually passes through the cavity 2, and the ejector pin 804 initially ejects the injection molded part. The reaction force of the ejector pin 804 is transmitted to the telescopic rod 808, causing the push plate 806 to press tightly against the inner wall of the sleeve 803. Under the continuous displacement of the telescopic plate 6, the rocker plate 802 gradually approaches the baffle 805. When one end of the rocker plate 802 contacts the baffle 805, the rocker plate 802 rotates around the connection point of the bracket 801, thereby triggering a secondary acceleration ejection. At this time, the other end of the rocker plate 802... The end contacts the connecting plate 7 and pushes the connecting plate 7 to move. At the same time, the connecting plate 7 moves along the outer wall of the guide post 5. At this time, the telescopic rod 808 moves synchronously with the connecting plate 7. The telescopic rod 808 slides on the inner wall of the sleeve 803 and drives the push plate 806 to squeeze the spring 807. At the same time, the ejector pin 804 suddenly accelerates, so that the product completely separates from the cavity 2. Thus, the initial slow ejection of the injection molded part can prevent the barrel product from cracking due to excessive local force. After the injection molded part initially separates from the cavity 2, it is ejected with secondary acceleration. At this time, the clamping force between the product and the cavity 2 has been greatly reduced. The acceleration force will not cause the product surface to be scratched and can reduce the time of a single ejection, thereby increasing production efficiency.

[0025] To prevent the ejector pin 804 from extending excessively and causing damage to the injection molded part, such as Figure 5 As shown, the limiting mechanism 9 includes a limiting plate 901, a slider 902, a limiting switch 903, and a screw 904. The limiting plate 901 is fixed to the outer surface of the baffle 805. A scale is provided on one side of the limiting plate 901, and a groove is opened on one side of the limiting plate 901. The slider 902 is slidably connected to the inner wall of the groove opened in the limiting plate 901. The limiting switch 903 is installed on the inner wall of the slider 902. The screw 904 is rotatably connected to one side of the baffle 805, and the screw 904 and the slider 902 are connected by threads. The model of the limiting switch 903 is DME TSW-2220.

[0026] Depending on the product's depth, the screw 904 is rotated. At this time, the slider 902 is affected by the thread, but the slider 902 is slidably connected in the groove of the limiting plate 901. Under this restriction, the slider 902 is limited from rotating, thus converting the rotational motion of the screw 904 into the translational motion of the limiting plate 901. This allows the slider 902 to slide along the inner wall of the groove opened in the limiting plate 901, and the distance can be observed and adjusted according to the scale. When the ejection mechanism 8 enters the secondary ejection stage, the connecting plate 7 drives the ejector pin 804 to extend out of the cavity 2. As the connecting plate 7 continues to move, its edge gradually approaches the limit switch 903. Then, the limit switch 903 sends a signal to the external controller of the hydraulic cylinder 4 to retract it. The retraction of the hydraulic cylinder 4 drives the telescopic plate 6, the connecting plate 7, and the ejector pin 804 to move in the opposite direction. This prevents the ejector pin 804 from over-extending, which could cause the injection molded part to be dented or deformed, thereby improving the product qualification rate.

[0027] Working principle: When the injection molded part needs to be ejected, the hydraulic cylinder 4 is activated, pushing the telescopic plate 6 to move along the guide post 5 towards the cavity 2. This, in turn, drives the ejection mechanism 8 and the connecting plate 7 to move synchronously. The ejection mechanism 8 begins to contact and push the product. Initially, the ejection mechanism 8 slowly pushes the product, gradually detaching it from the inner wall of the cavity 2. With continued movement, the ejection mechanism 8 triggers a secondary acceleration ejection, pushing the product out of the cavity 2 completely at a faster speed. After ejection is complete, the connecting plate 7 contacts the limiting mechanism 9, which stops the hydraulic cylinder 4 from extending and causes it to retract. When the injection molded part is ejected, the telescopic end of the hydraulic cylinder 4 extends outward, pushing the telescopic plate 6 to move along the guide post 5 towards the cavity 2. At this time, the sleeve 803, connecting plate 7, and ejector pin 804 move synchronously. The ejector pin 804 gradually passes through the cavity 2, and the ejector pin 804 initially ejects the injection molded part. The reaction force of the ejector pin 804 is transmitted to the telescopic rod 808, causing the push plate 806 to press tightly against the inner wall of the sleeve 803. Under the continuous displacement of the telescopic plate 6, the rocker plate 802 gradually approaches the baffle 805. When the rocker plate 802... After the end contacts the baffle 805, the rocker 802 rotates around the connection point of the bracket 801, triggering a secondary acceleration ejection. At this time, the other end of the rocker 802 contacts the connecting plate 7 and pushes the connecting plate 7 to move. Simultaneously, the connecting plate 7 moves along the outer wall of the guide post 5. At this time, the telescopic rod 808 moves synchronously with the connecting plate 7. The telescopic rod 808 slides on the inner wall of the sleeve 803 and drives the push plate 806 to compress the spring 807. At the same time, the ejector pin 804 suddenly accelerates, causing the product to completely detach from the cavity 2. According to the depth of the product, the screw 904 is rotated. At this time, the slider 902 is affected by the thread, but the slider 902 is slidably connected in the groove of the limiting plate 901. Under this restriction, the slider 902 is restricted from rotating, so that the rotational motion of the screw 904 is converted into the translational motion of the limiting plate 901, so that the slider 902 slides along the inner wall of the groove opened in the limiting plate 901. The distance can be observed and adjusted according to the scale. When the ejection mechanism 8 enters the secondary ejection stage, the connecting plate 7 drives the ejector pin 804 to extend out of the cavity 2. As the connecting plate 7 continues to move, its edge gradually approaches the limit switch 903. Then the limit switch 903 sends a signal to the external controller of the hydraulic cylinder 4 to retract it. The retraction of the hydraulic cylinder 4 drives the telescopic plate 6, the connecting plate 7 and the ejector pin 804 to move in the opposite direction.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An ejection device for injection-molding molds for injection-molded parts, comprising a movable mold body (1), characterized in that The moving mold body (1) has a cavity (2) on one side, and an installation plate (3) is fixed on one side of the inner wall of the moving mold body (1). An oil cylinder (4) is provided on the inner wall of the installation plate (3). A telescopic plate (6) is fixedly connected to the telescopic end of the oil cylinder (4). An ejection mechanism (8) is provided on one side of the telescopic plate (6). A connecting plate (7) is fixedly connected to one side of the ejection mechanism (8). The outer wall of the guide column (5) is sleeved with the connecting plate (7). A limit mechanism (9) is provided on one side of the ejection mechanism (8).

2. An ejection device for injection molds for injection-molded parts as claimed in claim 1, characterized in that The top of the moving mold body (1) is provided with a top cover, and the guide column (5) is fixedly connected to one side of the inner wall of the moving mold body (1), and the outer wall of the guide column (5) is sleeved with the telescopic plate (6).

3. An ejection device for injection molds for injection-molded parts as claimed in claim 1, characterized in that The ejection mechanism (8) includes a bracket (801), a rocker (802), a sleeve (803), an ejector pin (804), a baffle (805), a push plate (806), a spring (807), and a telescopic rod (808), with the sleeve (803) fixed to one side of the telescopic plate (6).

4. An ejection device for injection molds for injection-molded parts according to claim 3, characterized in that The push plate (806) is slidably connected to the inner wall of the sleeve (803). One end of the spring (807) is fixed to one side of the push plate (806), and the other end of the spring (807) is fixedly connected to one side of the inner wall of the sleeve (803). The telescopic rod (808) is welded to one side of the push plate (806), and a connecting plate (7) is fixedly connected to one side of the telescopic rod (808).

5. An ejection device for injection molds for injection-molded parts according to claim 3, characterized in that The bracket (801) is fixed to one side of the telescopic plate (6), the rocker (802) is rotatably connected to both sides of the inner wall of the bracket (801), the ejector pin (804) is fixed to the other side of the connecting plate (7), and the baffle (805) is installed on the inner wall of the moving mold body (1) away from the mounting plate (3).

6. An ejection device for injection molds for injection-molded parts as claimed in claim 1, characterized in that The limiting mechanism (9) includes a limiting plate (901), a slider (902), a limiting switch (903) and a screw (904). The limiting plate (901) is fixed to the outer surface of the baffle (805). A scale is provided on one side of the limiting plate (901), and a groove is provided on one side of the limiting plate (901).

7. An ejection device for injection molds for injection-molded parts according to claim 6, characterized in that The slider (902) is slidably connected to the inner wall of the groove opened in the limiting plate (901), the limiting switch (903) is installed on the inner wall of the slider (902), the screw (904) is rotatably connected to one side of the baffle (805), and the screw (904) and the slider (902) are connected by threads.

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