Multi-point balanced ejection mechanism for preventing deformation of plastic parts during ejection

Abstract

The utility model relates to injection mold technical field, concretely is a kind of multi-point balanced ejection mechanism for preventing plastic part ejection deformation, including first mounting plate, first mounting plate left side surface fixed mounting has push mechanism, first mounting plate right side surface outer end fixed mounting has connecting frame, connecting frame right side surface fixed mounting has second mounting plate, second mounting plate right side surface fixed mounting has movable template, movable template right side is provided with fixed template, and fixed template right side surface fixed mounting has third mounting plate;Push mechanism includes hydraulic cylinder, fixed mounting in the push plate of hydraulic cylinder telescopic rod top and the several ejection mechanisms of being arranged in second mounting plate.This utility model is distributed in the ejection mechanism of five respectively in the rectangular four corner positions and diagonal intersection position, is balanced to exert force to plastic part in ejection and is ejected to plastic part, can effectively prevent the deformation of plastic part caused by the force of single region of plastic part.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a multi-point balanced ejection mechanism to prevent deformation of plastic parts during ejection. Background Technology

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. The advantages of injection molding include high production speed and efficiency, automated operation, a wide variety of designs and shapes (from simple to complex), and sizes ranging from large to small. It also produces dimensionally accurate products, facilitates product updates and replacements, and can create complex shapes. Injection molding is suitable for mass production and molding processes involving complex shapes.

[0003] Utility model patent CN215283191U discloses a plastic part ejection mechanism. This utility model includes a moving mold plate and a fixed mold plate. A push rod is provided on one side of the moving mold plate, with both ends of the push rod connected to a hydraulic cylinder and a top plate. A first ejector pin and a second ejector pin are provided on the top plate. Both the first and second ejector pins include a thick rod and a thin rod. One end of the thick rod has a first threaded hole, and one end of the thin rod is disposed in the first threaded hole and threadedly connected to the thick rod. A mold cavity is provided on one side of the fixed mold plate, and a flow channel is provided through the fixed mold plate, communicating with the mold cavity. Both the first and second ejector pins include a thick rod and a thin rod threaded together. The thicker diameter of the thicker rod ensures a longer service life and reduces production costs, while the thinner diameter avoids leaving obvious marks on the surface of the product. The connection between the thin and thick rods is reliable, and disassembly and assembly are convenient and quick, facilitating the replacement of broken thin rods and saving production costs.

[0004] While the aforementioned utility model allows for convenient replacement of the thin rods, it only provides ejector rods at three positions (top, middle, and bottom) within the same vertical plane. During ejection, force can only be applied to a specific area of ​​the product on that vertical plane, resulting in concentrated force and potentially causing deformation. Therefore, we propose a multi-point balanced ejection mechanism to prevent deformation of the plastic part during ejection. Utility Model Content

[0005] This invention provides a multi-point balanced ejection mechanism to prevent deformation of plastic parts during ejection, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A multi-point balanced ejection mechanism for preventing deformation of plastic parts during ejection includes a first mounting plate, a pushing mechanism fixedly mounted on the left side surface of the first mounting plate, a connecting frame fixedly mounted on the outer end of the right side surface of the first mounting plate, a second mounting plate fixedly mounted on the right side surface of the connecting frame, a movable template fixedly mounted on the right side surface of the second mounting plate, a fixed template provided on the right side of the movable template, and a third mounting plate fixedly mounted on the right side surface of the fixed template. The pushing mechanism includes a hydraulic cylinder, a pushing plate fixedly installed at the top of the hydraulic cylinder telescopic rod, and a plurality of ejection mechanisms disposed in the second mounting plate; The ejection mechanism includes a mounting sleeve fixedly installed inside the second mounting plate, a baffle welded to the top of the inner surface of the mounting sleeve, and an ejection plate slidably connected inside the mounting sleeve. Sliding blocks are welded to both the left and right sides of the outer surface of the ejection plate. Two sliding grooves are provided on the inner surface of the mounting sleeve for the two sliding blocks to slide and connect. An ejection rod is welded to the middle position of the upper surface of the ejection plate. A through hole is provided on the upper surface of the baffle for the ejection rod to slide through. A spring is provided between the lower surface of the baffle and the upper surface of the ejection plate.

[0007] As a preferred technical solution, five push rods are welded to the right surface of the push plate, and the five push rods are distributed at the four corners of the rectangle on the right surface of the push plate and at the intersection of the diagonals.

[0008] This design uses a five-point distribution method of "four corners + center" to make the force of the push rod on the subsequent ejection mechanism more evenly distributed, avoiding excessive local force that could damage the ejected product.

[0009] As a preferred technical solution, there are five ejection mechanisms, and their positions correspond one-to-one with the positions of the push rods. The lower surface of the ejection plate is in close contact with the upper surface of the push rod.

[0010] This design ensures a tight fit between the ejector plate and the push rod, eliminating gaps between them, reducing lag and loss during force transmission, guaranteeing synchronous ejection, further improving ejection balance, and reducing the probability of plastic part deformation.

[0011] As a preferred technical solution, the bottom surface of the internal cavity of the moving template is provided with an ejection hole for the ejection rod to slide and connect. When the hydraulic cylinder is not started, the upper surface of the ejection rod and the bottom surface of the internal cavity of the moving template are located in the same plane.

[0012] This setting provides a sliding path for the ejector pin, limits the movement trajectory of the ejector pin, and prevents the ejector pin from deviating and scratching the moving mold or plastic part, thus protecting the appearance of the plastic part and the structure of the moving mold.

[0013] As a preferred technical solution, the inner bottom wall of the sliding groove is located on the upper side of the lower surface of the mounting sleeve, and the inner top wall of the sliding groove is flush with the upper surface of the mounting sleeve.

[0014] This feature, where the inner bottom wall of the sliding groove is higher than the lower surface of the mounting sleeve, limits the downward movement of the ejector plate to its extreme position, preventing the ejector plate from excessively moving downward and detaching from the mounting sleeve, thus ensuring the structural integrity of the ejection mechanism.

[0015] As a preferred technical solution, the vertical height of the mounting sleeve is equal to the thickness of the second mounting plate, and the inner surface of the mounting sleeve is smooth.

[0016] This setting ensures that the vertical height of the mounting sleeve is consistent with the thickness of the second mounting plate, allowing the mounting sleeve to be fully embedded inside the second mounting plate. This prevents the mounting sleeve from protruding or sinking, which could affect the fit between the second mounting plate and the moving template and connecting frame, thus guaranteeing the overall assembly accuracy of the mechanism.

[0017] As a preferred technical solution, when no external force is applied, the spring is in a compressed state, and the lower surface of the ejector plate is flush with the lower surface of the mounting sleeve.

[0018] This design, with the lower surface of the ejector plate flush with the lower surface of the mounting sleeve, provides a flat contact surface for the push rod to fit against the ejector plate, ensuring more uniform force transmission and preventing uneven force distribution on the ejector rod due to the tilt of the ejector plate, thus further improving ejection balance.

[0019] As a preferred technical solution, when the hydraulic cylinder is not started, the hydraulic cylinder telescopic rod passes through the first mounting plate and is fixedly connected to the left side surface of the push plate. At this time, the left side surface of the push plate is in contact with the right side surface of the first mounting plate.

[0020] This design, where the hydraulic cylinder telescopic rod passes through the first mounting plate, limits the direction of the telescopic rod's movement to prevent the push plate from tilting due to rod deviation. This ensures the stability of the push plate's movement of the push rod and provides directional assurance for subsequent balanced ejection.

[0021] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model sets up five ejection mechanisms distributed at the four corners of a rectangle and at the intersection of the diagonals, so as to apply force evenly to multiple points of the plastic part during ejection, thereby ejecting the plastic part and effectively preventing deformation of the plastic part that may be caused by force on a single area.

[0022] 2. This utility model uses a spring to buffer the force applied to the hydraulic press during transmission, preventing sudden loading of force from causing impact loads. Attached Figure Description

[0023] Figure 1This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the ejection mechanism in this utility model; Figure 3 This is a schematic diagram of the push rod structure in this utility model; Figure 4 This is a cross-sectional view of the ejection mechanism in this utility model; The meanings of the labels in the diagram are as follows: 100. First mounting plate; 200. Pushing mechanism; 210. Hydraulic cylinder; 220. Pushing plate; 221. Pushing rod; 230. Ejection mechanism; 231. Mounting sleeve; 232. Sliding groove; 233. Baffle; 234. Ejection rod; 235. Spring; 236. Sliding block; 237. Ejection plate; 300. Connecting frame; 400. Second mounting plate; 500. Moving template; 600. Fixed template; 700. Third mounting plate. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0025] Please see Figures 1-4 This embodiment provides a technical solution: A multi-point balanced ejection mechanism for preventing deformation of plastic parts during ejection includes a first mounting plate 100, a pushing mechanism 200 fixedly mounted on the left side surface of the first mounting plate 100, a connecting frame 300 fixedly mounted on the outer end of the right side surface of the first mounting plate 100, a second mounting plate 400 fixedly mounted on the right side surface of the connecting frame 300, a movable template 500 fixedly mounted on the right side surface of the second mounting plate 400, a fixed template 600 provided to the right of the movable template 500, and a third mounting plate 700 fixedly mounted on the right side surface of the fixed template 600.

[0026] The pushing mechanism 200 includes a hydraulic cylinder 210, a pushing plate 220 fixedly installed at the top of the telescopic rod of the hydraulic cylinder 210, and a plurality of ejection mechanisms 230 disposed within the second mounting plate 400; the pushing plate 220 is slidably disposed inside the connecting frame 300. The ejection mechanism 230 includes a mounting sleeve 231 fixedly installed inside the second mounting plate 400, a baffle 233 welded to the top of the inner surface of the mounting sleeve 231, and an ejection plate 237 slidably connected inside the mounting sleeve 231. Sliding blocks 236 are welded to both sides of the outer surface of the ejection plate 237. Two sliding grooves 232 are opened on the inner surface of the mounting sleeve 231 for sliding connection of the two sliding blocks 236. An ejection rod 234 is welded to the middle position of the upper surface of the ejection plate 237. A through hole is opened on the upper surface of the baffle 233 for the ejection rod 234 to slide through. A spring 235 is disposed between the lower surface of the baffle 233 and the upper surface of the ejection plate 237. With the above-mentioned mechanism, when the product needs to be removed after the injection molding process is completed, the product can be ejected by applying pressure evenly at multiple points through five ejection mechanisms, which can effectively prevent the product from deforming during ejection.

[0027] Furthermore, such as Figure 2 As shown, five push rods 221 are welded to the right surface of the push plate 220. The five push rods 221 are distributed at the four corners of the rectangle on the right surface of the push plate 220 and the intersection of the diagonals. There are five ejection mechanisms 230 in total, and their positions correspond one-to-one with the positions of the push rods 221. The lower surface of the ejection plate 237 is in close contact with the upper surface of the push rods 221 to ensure that the force can be smoothly transmitted after the hydraulic cylinder 210 is started.

[0028] In this embodiment, as Figure 1 As shown, the bottom surface of the internal cavity of the moving template 500 is provided with an ejection hole for the ejection rod 234 to slide. When the hydraulic cylinder 210 is not started, the upper surface of the ejection rod 234 and the bottom surface of the internal cavity of the moving template 500 are in the same plane, and will not affect the product being produced inside the cavity of the moving template 500.

[0029] In this embodiment, as Figure 4 As shown, the inner bottom wall of the sliding groove 232 is located above the lower surface of the mounting sleeve 231, and the inner top wall of the sliding groove 232 is flush with the upper surface of the mounting sleeve 231 to prevent the sliding block 236 from sliding out from the lower end of the sliding groove 232. The vertical height of the mounting sleeve 231 is equal to the thickness of the second mounting plate 400, and the inner surface of the mounting sleeve 231 is smooth to reduce the friction generated by the contact between the ejector plate 237 and the mounting sleeve 231.

[0030] When no external force is applied, the spring 235 is in a compressed state, and the lower surface of the ejector plate 237 is flush with the lower surface of the mounting sleeve 231, ensuring that the ejector plate 237 can receive the transmitted force as soon as the hydraulic cylinder 210 is activated. When the hydraulic cylinder 210 is not activated, the telescopic rod of the hydraulic cylinder 210 passes through the first mounting plate 100 and is fixedly connected to the left side surface of the push plate 220. At this time, the left side surface of the push plate 220 is in contact with the right side surface of the first mounting plate 100. The telescopic rod of the hydraulic cylinder 210, which is installed on the left side surface of the first mounting plate 100, is set to the right and passes through the first mounting plate 100 before connecting with the push plate 220, so that the hydraulic cylinder 210 installed on the left side of the first mounting plate 100 can control the push plate 220 located on the right side of the first mounting plate 100 to move to the right.

[0031] It is worth noting that the structure and working principle of the hydraulic cylinder 210 and spring 235 involved in this embodiment are as known to those skilled in the art, and will not be described in detail here.

[0032] In this embodiment, the multi-point balanced ejection mechanism for preventing deformation of the plastic part during ejection operates as follows: After the product is injection molded between the moving mold plate 500 and the fixed mold plate 600, the moving mold plate 500 moves to the left. Once the moving mold plate 500 reaches its leftmost position, the hydraulic cylinder 210 is activated. The extension rod of the hydraulic cylinder 210 extends, pushing the push plate 220 located to the right of the first mounting plate 100 to the right. This rightward movement of the push plate 220 causes the push rod 221 to apply a rightward thrust to the ejection plate 237. This force controls the ejection plate 237. 7. Move to the right to compress the spring 235, allowing the top of the ejector rod 234 to enter the cavity of the moving template 500 and eject the injection-molded product from the cavity. Then, control the hydraulic cylinder 210 to retract, pushing the plate 220 back to its original position. At the same time, the spring 235, without external force, begins to apply a pushing force to both ends. The baffle at the upper end of the spring 235 is welded and fixed and cannot move. Under the action of this force, the ejector plate 237 at the lower end of the spring 235 moves along the sliding groove 232 to the bottom of the mounting sleeve 231 and returns to its original position, waiting for the next ejection action.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A multi-point balanced ejection mechanism for preventing deformation of plastic parts during ejection, comprising a first mounting plate (100), characterized in that: A pushing mechanism (200) is fixedly installed on the left side surface of the first mounting plate (100), a connecting frame (300) is fixedly installed on the outer end of the right side surface of the first mounting plate (100), a second mounting plate (400) is fixedly installed on the right side surface of the connecting frame (300), a moving template (500) is fixedly installed on the right side surface of the second mounting plate (400), a fixed template (600) is provided on the right side of the moving template (500), and a third mounting plate (700) is fixedly installed on the right side surface of the fixed template (600). The pushing mechanism (200) includes a hydraulic cylinder (210), a pushing plate (220) fixedly installed at the top of the telescopic rod of the hydraulic cylinder (210), and a plurality of ejection mechanisms (230) disposed in the second mounting plate (400). The ejection mechanism (230) includes an installation sleeve (231) fixedly installed inside the second installation plate (400), a baffle (233) welded to the top of the inner surface of the installation sleeve (231), and an ejection plate (237) slidably connected inside the installation sleeve (231). Sliding blocks (236) are welded to both sides of the outer surface of the ejection plate (237). Two sliding grooves (232) are opened on the inner surface of the installation sleeve (231) for sliding connection of the two sliding blocks (236). An ejection rod (234) is welded to the middle position of the upper surface of the ejection plate (237). A through hole is opened on the upper surface of the baffle (233) for the ejection rod (234) to slide through. A spring (235) is provided between the lower surface of the baffle (233) and the upper surface of the ejection plate (237).

2. The multi-point balanced ejection mechanism for preventing deformation of plastic parts during ejection as described in claim 1, characterized in that: Five push rods (221) are welded to the right surface of the push plate (220). The five push rods (221) are distributed at the four corners of the rectangle on the right surface of the push plate (220) and at the intersection of the diagonals.

3. The multi-point balanced ejection mechanism for preventing deformation of plastic parts during ejection as described in claim 2, characterized in that: There are five ejection mechanisms (230), and their positions correspond one-to-one with the positions of the push rods (221). The lower surface of the ejection plate (237) is in close contact with the upper surface of the push rods (221).

4. The multi-point balanced ejection mechanism for preventing deformation of plastic parts during ejection as described in claim 3, characterized in that: The bottom surface of the inner cavity of the moving template (500) is provided with an ejection hole for the ejector rod (234) to slide and connect. When the hydraulic cylinder (210) is not started, the upper surface of the ejector rod (234) and the bottom surface of the inner cavity of the moving template (500) are located in the same plane.

5. The multi-point balanced ejection mechanism for preventing deformation of plastic parts during ejection as described in claim 4, characterized in that: The inner bottom wall of the sliding groove (232) is located on the upper side of the lower surface of the mounting sleeve (231), and the inner top wall of the sliding groove (232) is flush with the upper surface of the mounting sleeve (231).

6. The multi-point balanced ejection mechanism for preventing deformation of plastic parts during ejection as described in claim 5, characterized in that: The vertical height of the mounting sleeve (231) is equal to the thickness of the second mounting plate (400), and the inner surface of the mounting sleeve (231) is smooth.

7. The multi-point balanced ejection mechanism for preventing deformation of plastic parts during ejection as described in claim 6, characterized in that: When no external force is applied, the spring (235) is in a compressed state, and the lower surface of the ejector plate (237) is flush with the lower surface of the mounting sleeve (231).

8. The multi-point balanced ejection mechanism for preventing deformation of plastic parts during ejection as described in claim 7, characterized in that: When the hydraulic cylinder (210) is not started, the telescopic rod of the hydraulic cylinder (210) passes through the first mounting plate (100) and is fixedly connected to the left side surface of the push plate (220). At this time, the left side surface of the push plate (220) is in contact with the right side surface of the first mounting plate (100).

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