Ejection mechanism for injection mould

Abstract

The utility model relates to injection mold technical field especially relates to a kind of injection mold ejection mechanism. Including bottom plate, several ejector pins, top plate and replacement device, the peripheral angle of the bottom plate is fixedly connected with support, the surface of the support is fixedly connected with pneumatic cylinder, the output end of the pneumatic cylinder is fixedly connected with moving plate, the inner wall of the moving plate is slidably connected with support, the lower surface of the moving plate is fixedly connected with upper die holder, the position of the bottom plate corresponding upper die holder is fixedly connected with object table, the section of the object table is "U" shape, the upper surface of the object table is fixedly connected with lower die holder, the arc surface of the ejector pin is slidably penetrated with lower die holder and object table, the ejector pin is fixedly connected with top plate by replacement device, the position of the bottom plate corresponding lower die holder is equipped with ejection mechanism. The injection mold ejection mechanism provided by the utility model has the advantage that the injection molding product can be ejected by uniform force.

Description

Technical Field

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

[0002] The working principle of an injection mold is to inject molten plastic material into the mold cavity, which then cools and solidifies to obtain a part of a predetermined shape. The ejection mechanism of an injection mold is mainly responsible for smoothly ejecting the molded plastic part from the mold cavity, ensuring that the product is demolded without damage. It mainly includes ejector pins, ejector plates, guide devices, and drive devices.

[0003] Existing technologies, such as the utility model patent with publication number CN223173497U, disclose an ejector injection mold. This utility model proposes an ejector injection mold with a material handling function, including a base, a limiting ring, etc. The limiting ring is fixedly connected to the base, and a turntable is rotatably connected inside the limiting ring. A motor is mounted on the top of the base, and the output shaft of the motor is connected to a rotating shaft via a coupling. The rotating shaft is fixedly connected to the turntable, and molds are mounted on both the left and right sides of the upper side of the turntable. A demolding assembly for ejecting plastic products is provided inside the base. A guide seat is fixedly connected to the rear of the base, and an electric push rod is rotatably connected inside the guide seat. This utility model first achieves rapid demolding through a cylinder and an ejector frame, and then automatically removes the demolded product from the mold through the electric push rod, vacuum suction cup, sliding rod, and S-shaped groove on the guide seat. This reduces operating time and the workload of workers, thereby improving production efficiency.

[0004] During the production process using injection molds, it has been found that the molded products can adhere to the mold surface, making them difficult to remove and even causing damage. This necessitates the use of an ejector mechanism to remove the molded products. However, traditional ejector mechanisms, which directly push the product using ejector pins and other mechanical components, can lead to uneven force distribution on the product during ejection, resulting in deformation or breakage of the molded products. Utility Model Content

[0005] The purpose of this invention is to solve the problem in the prior art where the molded product adheres to the mold surface, making it difficult to remove or even damaging the product. This necessitates an ejection mechanism to eject the molded product. However, traditional ejection mechanisms directly push the product through mechanical parts such as ejector pins, which can lead to uneven force on the product during ejection, resulting in deformation or breakage of the molded product.

[0006] To solve the above technical problems, this utility model provides an ejection mechanism for an injection mold, comprising: a base plate, a plurality of ejector pins, an ejector plate, and a replacement device. A bracket is fixedly connected to the four corners of the base plate. A cylinder is fixedly connected to the surface of the bracket. A movable plate is fixedly connected to the output end of the cylinder. The inner wall of the movable plate is slidably connected to the bracket. An upper mold base is fixedly connected to the lower surface of the movable plate. A platform is fixedly connected to the base plate at a position corresponding to the upper mold base. The platform has a U-shaped cross-section. A lower mold base is fixedly connected to the upper surface of the platform. The arc surface of the ejector pin slides through the lower mold base and the stage. The ejector pin is fixedly connected to the top plate via a replacement device. The bottom plate is provided with an ejection device corresponding to the position of the lower mold base. The ejection device includes a first screw and a support block. The lower end surface of the first screw is rotatably connected to the bottom plate, and a first bevel gear is fixedly connected to the lower end of the first screw. The lower surface of the support block is fixedly connected to the bottom plate, and a second screw is rotatably connected to the inner wall of the support block. A second bevel gear is fixedly connected to one end of the second screw, and the lower end surface of the first screw is rotatably connected to the bottom plate. The first screw is fixedly connected to the second bevel gear at the position corresponding to the first screw. The tooth surface of the first bevel gear meshes with the tooth surface of the second bevel gear. A push plate is threaded through the arc surface of the first screw. Limiting frames are fixedly connected to both sides of the inner wall of the platform. The cross-section of the limiting frame is "U" shaped. The inner wall of the limiting frame abuts against the push plate. Supports are fixedly connected to both ends of the upper surface of the push plate. A rotating plate is rotatably connected to the inner wall of the support. The rotating plate includes a short arm end and a long arm end. The side of the short arm end of the rotating plate away from the long arm end... The rotating plate is tilted, with a pressing wheel rotatably connected to the inner wall of the short arm end. The arc surface of the pressing wheel abuts against a limiting plate. One side of the limiting plate is fixedly connected to a platform. A pulley is rotatably connected to the inner wall of the long arm end of the rotating plate. A groove is provided on the top plate corresponding to the position of the pulley. The inner wall of the groove is slidably connected to the pulley. Two telescopic rods are fixedly connected to the upper surface of the push plate. The upper surfaces of the two telescopic rods are fixedly connected to the same top plate. Two limiting blocks are fixedly connected to the upper surface of the push plate. The upper surfaces of the two limiting blocks abut against the top plate.

[0007] The effect achieved by the above components is as follows: When the injection-molded product needs to be ejected from the lower mold base, rotating the second screw causes the second bevel gear to drive the first bevel gear and the first screw to rotate, causing the push plate to move upward. When the push plate moves upward, the rotating plate also moves upward. As the rotating plate moves upward, the short arm end of the rotating plate is squeezed by the limiting plate, causing the rotating plate to rotate around the support. This causes the pulley to slide in the groove while pushing the top plate upward. The top plate and the push plate are relatively displaced, and the ejector pin is also moved upward, so that the product can be ejected. Then, rotating the second screw in the opposite direction causes the first screw to move the push plate downward until the push plate abuts against the limiting frame. The top plate also moves downward under the action of gravity until it abuts against the limiting block. The rotating plate is also pushed in the opposite direction by the top plate. At the same time, the upper surface of the ejector pin returns to its original position, which is convenient for the next processing.

[0008] Preferably, the surface of the telescopic rod is fitted with a spring, and the two ends of the spring are fixedly connected to the top plate and the push plate, respectively.

[0009] The effect achieved by the above components is that when the top plate and the push plate are relatively displaced, the spring can provide elastic force to prevent the pulley from falling off the slide.

[0010] Preferably, two limiting rods are fixedly connected to the upper surface of the base plate, the upper surface of the limiting rods is fixedly connected to the platform, and the arc surface of the limiting rods slides through the push plate and the top plate.

[0011] The effect achieved by the above components is that the limit rods limit the movement of the push plate and the top plate.

[0012] Preferably, a plurality of anti-slip patterns are formed on the arc surface of one end of the second screw, and the plurality of anti-slip patterns are evenly distributed on the arc surface of one end of the second screw.

[0013] The effect achieved by the above components is that the anti-slip texture increases friction, making it easier to rotate the second screw.

[0014] Preferably, the replacement device is located on the top plate surface corresponding to the ejector pin. The replacement device includes a fixing block with an "L"-shaped cross-section. The lower surface of the fixing block is fixedly connected to the top plate. A limiting seat is fixedly connected to the surface of the fixing block. A fixing clamp is fixedly connected to the inner wall of the limiting seat. One side of the fixing clamp abuts against the ejector pin. The cross-section of the fixing clamp corresponding to the ejector pin is arc-shaped. A rotating clamp is rotatably connected to the inner wall of the limiting seat. One side of the rotating clamp abuts against the ejector pin. The cross-section of the rotating clamp corresponding to the ejector pin is arc-shaped. One side of the rotating clamp abuts against one side of the fixing clamp. Two insert rods are threaded through the inner wall of the fixing clamp. The arc surfaces of the two insert rods are threaded through the same rotating clamp.

[0015] The effect achieved by the above components is as follows: when the ejector needs to be replaced after a long period of use, first turn out the two insert rods, then turn the rotating clamp to remove the old ejector, put the new ejector back in its original position so that the ejector abuts against the fixed clamp, then turn the rotating clamp to make the rotating clamp abut against the ejector, and then turn the two insert rods back to fix the rotating clamp, thus the ejector is replaced.

[0016] Preferably, the inner arc surface of the limiting seat is fitted with two coil springs, and the two ends of the coil springs are respectively fixedly connected to the fixed clamping block and the rotating clamping block.

[0017] The effect achieved by the above components is that the coil spring can make the rotating clamp block rotate continuously in the direction of the fixed clamp block, which facilitates the replacement of the ejector pin.

[0018] Preferably, friction pads, which are rubber pads, are fixedly connected to the sides of the fixed clamping block and the rotating clamping block that are close to each other.

[0019] The effect achieved by the above components is that the rubber pad has a good anti-slip effect, which can make the ejector pin be fixed more tightly.

[0020] Compared with related technologies, the injection mold ejection mechanism provided by this utility model has the following beneficial effects:

[0021] When ejecting the injection-molded product from the lower mold base, the second screw is first rotated, causing the second bevel gear to drive the first bevel gear and the first screw to rotate. This moves the push plate upward along the limiting rod. As the push plate moves upward, the support and rotating plate also move upward. During this upward movement, the short arm end of the rotating plate is pressed by the limiting plate, causing the rotating plate to rotate around the support. This causes the pulley to slide within the groove while pushing the top plate upward. The top plate and push plate then experience relative displacement, and the ejector pin is also moved upward by the top plate, thus ejecting the product. Then, the second screw is rotated in the opposite direction, causing the first screw to move the push plate downward until it abuts against the two limiting brackets. The top plate, under gravity, also moves downward until it abuts against the limiting block. The rotating plate is also pushed in the opposite direction by the top plate, and simultaneously, the upper surface of the ejector pin returns to its original position for subsequent processing. By operating the ejection device, the injection-molded product is ejected.

[0022] When the ejector pin needs to be replaced after prolonged use, first unscrew the two insert rods, then rotate the clamping block to remove the old ejector pin. Place the new ejector pin back in its original position, making it abut against the fixed clamping block. Then rotate the clamping block again, making it abut against the ejector pin. Finally, turn the two insert rods back to fix the clamping block in place. The ejector pin is now replaced. By operating the replacement device, the ejector pin can be replaced. Attached Figure Description

[0023] Figure 1A schematic diagram of the structure of an ejection mechanism for an injection mold provided by this utility model;

[0024] Figure 2 for Figure 1 A side view of an ejection mechanism for an injection mold is shown.

[0025] Figure 3 for Figure 2 The enlarged view at point A is shown below;

[0026] Figure 4 for Figure 1 The diagram shows the structure of the ejection device.

[0027] Figure 5 for Figure 4 A partial structural schematic diagram of the ejection device is shown;

[0028] Figure 6 for Figure 4 A partial structural schematic diagram of the ejection device is shown;

[0029] Figure 7 for Figure 3 The diagram shows the structure of the replacement device.

[0030] Figure 8 for Figure 7 The diagram shows the disassembled structure of the replacement device.

[0031] Labels in the diagram: 1. Base plate; 2. Support; 3. Cylinder; 4. Moving plate; 5. Platform; 6. Lower mold base; 7. Upper mold base; 8. Ejector pin; 9. Ejection device; 901. First screw; 902. First bevel gear; 903. Second bevel gear; 904. Second screw; 905. Support block; 906. Anti-slip texture; 907. Push plate; 908. Limiting frame; 909. Support; 91. 0. Turning plate; 911. Extrusion wheel; 912. Limiting plate; 913. Pulley; 914. Limiting block; 915. Telescopic rod; 916. Spring; 917. Top plate; 918. Limiting rod; 919. Slide groove; 10. Changing device; 101. Fixing block; 102. Limiting seat; 103. Fixing clamp; 104. Rotating clamp; 105. Coil spring; 106. Insert rod; 107. Friction pad. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0033] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0034] Please see Figures 1 to 8 This utility model provides an injection mold ejection mechanism, including: a base plate 1, a plurality of ejector pins 8, a top plate 917, and a replacement device 10. A bracket 2 is fixedly connected to the four corners of the base plate 1. A cylinder 3 is fixedly connected to the surface of the bracket 2. A movable plate 4 is fixedly connected to the output end of the cylinder 3. The inner wall of the movable plate 4 is slidably connected to the bracket 2. An upper mold base 7 is fixedly connected to the lower surface of the movable plate 4. A platform 5 is fixedly connected to the base plate 1 at the position corresponding to the upper mold base 7. The platform 5 has a U-shaped cross section. A lower mold base 6 is fixedly connected to the upper surface of the platform 5. The arc surface of the ejector pin 8 slides through the lower mold base 6 and the platform 5. The ejector pin 8 is fixedly connected to the top plate 917 by means of the replacement device 10. An ejection device 9 is provided on the base plate 1 at the position corresponding to the lower mold base 6. The replacement device 10 is located on the surface of the top plate 917 at the position corresponding to the ejector pin 8.

[0035] In the embodiments of this utility model, please refer to Figures 4 to 6The ejector device 9 includes a first screw 901 and a support block 905. The lower end surface of the first screw 901 is rotatably connected to the base plate 1, and a first bevel gear 902 is fixedly connected to the lower end of the first screw 901. The lower surface of the support block 905 is fixedly connected to the base plate 1, and a second screw 904 is rotatably connected to the inner wall of the support block 905. A second bevel gear 903 is fixedly connected to one end of the second screw 904. The lower end surface of the first screw 901 is connected to the base plate 1. 1. A rotating connection is established, with a first bevel gear 902 fixedly connected to the first screw 901 at the position corresponding to the second bevel gear 903. The tooth surface of the first bevel gear 902 meshes with the tooth surface of the second bevel gear 903. A push plate 907 is threaded through the arc surface of the first screw 901. Limiting frames 908 are fixedly connected to both sides of the inner wall of the platform 5. The cross-section of the limiting frame 908 is U-shaped, and the inner wall of the limiting frame 908 abuts against the push plate 907. Supports 909 are fixedly connected to both ends of the upper surface of plate 907. A rotating plate 910 is rotatably connected to the inner wall of the support 909. The rotating plate 910 includes a short arm end and a long arm end. The side of the short arm end of the rotating plate 910 away from the long arm end is inclined. A pressing wheel 911 is rotatably connected to the inner wall of the short arm end of the rotating plate 910. The arc surface of the pressing wheel 911 abuts against a limiting plate 912. One side of the limiting plate 912 is fixedly connected to the stage 5. The inner wall of the long arm end of the rotating plate 910... The wall is rotatably connected to a pulley 913. The top plate 917 has a groove 919 corresponding to the position of the pulley 913. The inner wall of the groove 919 is slidably connected to the pulley 913. The upper surface of the push plate 907 is fixedly connected to two telescopic rods 915. The upper surfaces of the two telescopic rods 915 are fixedly connected to the same top plate 917. The upper surface of the push plate 907 is fixedly connected to two limiting blocks 914. The upper surfaces of the two limiting blocks 914 abut against the top plate 917. When the injection-molded product needs to be ejected from the lower mold base 6, the second screw 904 is rotated, causing the second bevel gear 903 to drive the first bevel gear 902 and the first screw 901 to rotate, causing the push plate 907 to move upward. When the push plate 907 moves upward, the rotating plate 910 also moves upward. As the rotating plate 910 moves upward, its short arm end is squeezed by the limiting plate 912, causing the rotating plate 910 to rotate around the support 909. This causes the pulley 913 to slide in the groove 919 while pushing the top plate 917 towards... As the top plate 917 moves upward, the relative displacement between it and the push plate 907 causes the ejector pin 8 to move upward as well, thus ejecting the product. Then, the second screw 904 rotates in the opposite direction, causing the first screw 901 to move the push plate 907 downward until it abuts against the limit frame 908. Under gravity, the top plate 917 also moves downward until it abuts against the limit block 914. The rotating plate 910 is also pushed in the opposite direction by the top plate 917, and simultaneously, the upper surface of the ejector pin 8 returns to its original position for subsequent processing. A spring 916 is fitted onto the surface of the telescopic rod 915, with both ends of the spring 916 fixedly connected to the top plate 917 and the push plate 907, respectively.When the top plate 917 and the push plate 907 undergo relative displacement, the spring 916 provides elastic force to prevent the pulley 913 from falling off the slide groove 919. Two limiting rods 918 are fixedly connected to the upper surface of the base plate 1. The upper surface of the limiting rods 918 is fixedly connected to the platform 5, and the arc surface of the limiting rods 918 slides through the push plate 907 and the top plate 917. The limiting rods 918 limit the movement of the push plate 907 and the top plate 917. Several anti-slip patterns 906 are evenly distributed on the arc surface of one end of the second screw 904. The anti-slip patterns 906 increase friction, making it easier to rotate the second screw 904.

[0036] In the embodiments of this utility model, please refer to Figure 7 and Figure 8 The replacement device 10 includes a fixing block 101 with an "L"-shaped cross-section. The lower surface of the fixing block 101 is fixedly connected to the top plate 917. A limiting seat 102 is fixedly connected to the surface of the fixing block 101. A fixing clamp 103 is fixedly connected to the inner wall of the limiting seat 102. One side of the fixing clamp 103 abuts against the ejector pin 8. The cross-section of the fixing clamp 103 corresponding to the position of the ejector pin 8 is arc-shaped. A rotating clamp 104 is rotatably connected to the inner wall of the limiting seat 102. One side of the rotating clamp 104 abuts against the ejector pin 8. The cross-section of the rotating clamp 104 corresponding to the position of the ejector pin 8 is arc-shaped. One side of the rotating clamp 104 abuts against one side of the fixing clamp 103. Two insert rods 106 are threaded through the inner wall of the fixing clamp 103. The arc surfaces of the two insert rods 106 are threaded through the same rotating clamp 104. When the ejector pin 8 needs to be replaced after prolonged use, first rotate the two insert rods 106 out, then rotate the rotating clamp 104 to remove the old ejector pin 8, and put the new ejector pin 8 back in its original position so that the ejector pin 8 abuts against the fixed clamp 103. Then rotate the rotating clamp 104 so that the rotating clamp 104 abuts against the ejector pin 8, and then rotate the two insert rods 106 back to fix the rotating clamp 104. In this way, the ejector pin 8 is replaced. The inner arc surface of the limiting seat 102 is fitted with two coil springs 105. The two ends of the coil springs 105 are fixedly connected to the fixed clamp 103 and the rotating clamp 104, respectively. The coil springs 105 can make the rotating clamp 104 rotate continuously in the direction of the fixed clamp 103, which facilitates the replacement of the ejector pin 8. Friction pads 107, which are rubber pads, are fixedly connected to the sides of the fixed clamp 103 and the rotating clamp 104 that are close to each other. The rubber pad has a good anti-slip effect, which can make the ejector pin 8 more secure;

[0037] The working principle of the injection mold ejection mechanism provided by this utility model is as follows: When it is necessary to eject the injection-molded product from the lower mold base 6, firstly rotate the second screw 904 to make the second bevel gear 903 drive the first bevel gear 902 and the first screw 901 to rotate, so that the push plate 907 moves upward along the limiting rod 918. When the push plate 907 moves upward, the support 909 and the rotating plate 910 also move upward. When the rotating plate 910 moves upward, the short arm end of the rotating plate 910 will be squeezed by the limiting plate 912, so that the rotating plate 910 rotates around the support 909. In this way, the pulley 913 will be in the slide groove 91. While sliding inside, the top plate 917 is pushed upward, causing relative displacement between the top plate 917 and the push plate 907. The ejector pin 8 is also moved upward by the top plate 917, allowing the product to be ejected. Then, the second screw 904 is rotated in the opposite direction, causing the first screw 901 to move the push plate 907 downward until the push plate 907 abuts against the two limit frames 908. Under the action of gravity, the top plate 917 also moves downward until it abuts against the limit block 914. The rotating plate 910 is also pushed in the opposite direction by the top plate 917. At the same time, the upper surface of the ejector pin 8 returns to its original position for easy processing next time.

[0038] When the ejector pin 8 needs to be replaced after long-term use, first turn out the two insert rods 106, then turn the rotating clamp 104 to remove the old ejector pin 8, put the new ejector pin 8 back in its original position so that the ejector pin 8 abuts against the fixed clamp 103, then turn the rotating clamp 104 so that the rotating clamp 104 abuts against the ejector pin 8, and then turn the two insert rods 106 back to fix the rotating clamp 104. In this way, the ejector pin 8 is replaced.

[0039] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0040] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An ejection mechanism for an injection mold, characterized in that, include: The base plate (1), several ejector pins (8), a top plate (917), and a replacement device (10) are provided. A bracket (2) is fixedly connected to the four corners of the base plate (1). A cylinder (3) is fixedly connected to the surface of the bracket (2). A movable plate (4) is fixedly connected to the output end of the cylinder (3). The inner wall of the movable plate (4) is slidably connected to the bracket (2). An upper mold base (7) is fixedly connected to the lower surface of the movable plate (4). A platform (5) is fixedly connected to the base plate (1) at a position corresponding to the upper mold base (7). The platform (5) has a U-shaped cross-section. A lower mold base (6) is fixedly connected to the upper surface of the platform (5). The arc surface of the ejector pin (8) slides through the lower mold base (6) and the platform (5). The ejector pin (8) is fixedly connected to the top plate (917) by means of a replacement device (10). The bottom plate (1) is provided with an ejector device (9) at the position corresponding to the lower mold base (6). The ejector device (9) includes a first screw (901) and a support block (905). The lower end surface of the first screw (901) is rotatably connected to the bottom plate (1). A first bevel gear (902) is fixedly connected to the lower end of the first screw (901). The lower surface of the support block (905) is fixedly connected to the bottom plate (1). A second screw (904) is rotatably connected to the inner wall of the support block (905). A second bevel gear (903) is fixedly connected to one end of the second screw (904). The first screw (901) The lower end surface is rotatably connected to the base plate (1). The first screw (901) is fixedly connected to the position of the second bevel gear (903) with the first bevel gear (902). The tooth surface of the first bevel gear (902) meshes with the tooth surface of the second bevel gear (903). The arc surface of the first screw (901) is threaded through the push plate (907). Limiting frames (908) are fixedly connected to both sides of the inner wall of the platform (5). The cross-section of the limiting frame (908) is "U". The inner wall of the limiting frame (908) abuts against the push plate (907). Supports (909) are fixedly connected to both ends of the upper surface of the push plate (907). The inner wall of the support (909) is rotatably connected to a rotating plate (909). 910), the rotating plate (910) includes a short arm end and a long arm end. The side of the short arm end of the rotating plate (910) away from the long arm end is inclined. An extrusion wheel (911) is rotatably connected to the inner wall of the short arm end of the rotating plate (910). The arc surface of the extrusion wheel (911) abuts against a limiting plate (912). One side of the limiting plate (912) is fixedly connected to the platform (5). A pulley (913) is rotatably connected to the inner wall of the long arm end of the rotating plate (910). A groove (919) is opened on the top plate (917) corresponding to the position of the pulley (913). The inner wall of the groove (919) is slidably connected to the pulley (913). Two telescopic rods (915) are fixedly connected to the upper surface of the push plate (907).The upper surfaces of both telescopic rods (915) are fixedly connected to the same top plate (917), and the upper surface of the push plate (907) is fixedly connected to two limiting blocks (914), the upper surfaces of which abut against the top plate (917).

2. The ejection mechanism of an injection mold according to claim 1, characterized in that, The surface of the telescopic rod (915) is fitted with a spring (916), and the two ends of the spring (916) are fixedly connected to the top plate (917) and the push plate (907) respectively.

3. The ejection mechanism of an injection mold according to claim 1, characterized in that, Two limiting rods (918) are fixedly connected to the upper surface of the base plate (1). The upper surface of the limiting rods (918) is fixedly connected to the platform (5). The arc surface of the limiting rods (918) slides through the push plate (907) and the top plate (917).

4. The ejection mechanism of an injection mold according to claim 1, characterized in that, The second screw (904) has a plurality of anti-slip patterns (906) on one end of its arc surface, and the plurality of anti-slip patterns (906) are evenly distributed on one end of the arc surface of the second screw (904).

5. The ejection mechanism of an injection mold according to claim 1, characterized in that, The replacement device (10) is located on the surface of the top plate (917) corresponding to the ejector pin (8). The replacement device (10) includes a fixing block (101) with an "L"-shaped cross-section. The lower surface of the fixing block (101) is fixedly connected to the top plate (917). A limiting seat (102) is fixedly connected to the surface of the fixing block (101). A fixing clamp (103) is fixedly connected to the inner wall of the limiting seat (102). One side of the fixing clamp (103) abuts against the ejector pin (8). The cross section corresponding to the position of the ejector pin (8) is arc-shaped. The inner wall of the limiting seat (102) is rotatably connected to a rotating clamping block (104). One side of the rotating clamping block (104) abuts against the ejector pin (8). The cross section corresponding to the position of the ejector pin (8) of the rotating clamping block (104) is arc-shaped. One side of the rotating clamping block (104) abuts against one side of the fixed clamping block (103). The inner wall of the fixed clamping block (103) is threaded through by two insert rods (106). The arc surfaces of the two insert rods (106) are threaded through the same rotating clamping block (104).

6. The ejection mechanism of an injection mold according to claim 5, characterized in that, The inner arc surface of the limiting seat (102) is fitted with two coil springs (105), and the two ends of the coil springs (105) are fixedly connected to the fixed clamping block (103) and the rotating clamping block (104) respectively.

7. The ejection mechanism of an injection mold according to claim 5, characterized in that, The fixed clamping block (103) and the rotating clamping block (104) are both fixedly connected to friction pads (107) on the side close to each other. The friction pads (107) are rubber pads.

Images