A type of overmolding injection mold

Abstract

This utility model relates to the field of papermaking processing and discloses a rubber-coating injection mold, including a lower mold, an upper mold at the top of the lower mold, an ejection assembly inside the lower mold, and a replacement assembly inside the lower mold. The ejection assembly includes two mounting slots, which are respectively located inside the two ends of the lower mold. A rectangular groove is formed on one side of each mounting slot. An electric push rod is fixedly connected to the inner wall of the rectangular groove. A bracket is fixedly connected to the inner wall of the mounting slot. An inclined block is slidably connected to the bottom wall of the bracket. A sliding rod is slidably connected to the top of the bracket. A disc is fixedly connected to the bottom end of the sliding rod. In this utility model, the automatic ejection of the roller core is achieved through the linkage of the electric push rod, the inclined block, the pulley, and the spring, solving the problem that improper force applied by operators during the removal process can easily damage and deform the surface of the rubber roller, affecting product quality.

Description

Technical Field

[0001] This utility model relates to the field of papermaking and processing, and in particular to a rubber-coated injection mold. Background Technology

[0002] In industrial production, rubber rollers need to combine the rigid support of the roller core with the elasticity and wear resistance of the outer rubber layer. In traditional processes, the connection between the roller core and the rubber layer often falls off due to poor adhesion, and the production efficiency is low. To solve this problem, a rubber-coating injection mold has emerged. This type of rubber-coating injection mold typically consists of two parts: a fixed mold and a moving mold. After the fixed mold and the moving mold are closed, they form a cavity that matches the shape of the rubber roller. The inner side of the cavity is reserved for the thickness of the outer layer of rubber material. The roller core can be fixed in the center of the cavity by a positioning mechanism to ensure that its relative position with the rubber material is accurate. During operation, the pre-made roller core is first fixed on the mold positioning structure. After the mold is closed, molten rubber material is injected into the cavity through the injection port. Under pressure, the rubber material fills the cavity and tightly covers the surface of the roller core. After cooling and solidification, the moving mold and the fixed mold are separated to obtain the coated rubber roller. Existing overmolding injection molds lack a dedicated ejection device. After the rubber roller cools and solidifies in the cavity, due to the adhesion between the rubber material and the mold cavity wall, and the weight and size of the rubber roller itself, it is difficult for operators to remove it directly from the cavity smoothly. During the removal process, improper force can easily damage and deform the surface of the rubber roller, affecting product quality. Therefore, an overmolding injection mold is proposed to solve the above problems. Utility Model Content

[0003] To overcome the above shortcomings, this utility model provides a rubber-coated injection mold, which aims to improve the problem that in the prior art, it is difficult for operators to directly and smoothly remove the mold from the cavity, and improper force during the removal process can easily damage and deform the surface of the rubber roller, affecting product quality.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a rubber-coating injection mold, including a lower mold, an upper mold at the top of the lower mold, an ejection assembly inside the lower mold, a replacement assembly inside the lower mold, the ejection assembly including two mounting slots, the two mounting slots respectively located inside both ends of the lower mold, a rectangular groove on one side of the two mounting slots, an electric push rod fixedly connected to the inner wall of the rectangular groove, a bracket fixedly connected to the inner wall of the mounting slot, an inclined block slidably connected to the bottom wall of the bracket, a sliding rod slidably connected to the top of the bracket, a disc fixedly connected to the bottom end of the sliding rod, an extrusion ring fixedly connected to the top end of the sliding rod through the lower mold, a spring fixedly connected to the top end of the disc, and a pulley fixedly connected to the bottom end of the disc; As a further description of the above technical solution: The replacement component includes two rectangular slots, which are respectively located inside the two ends of the lower mold above the ejection component. A spring is fixedly connected to one side of each rectangular slot, a baffle is fixedly connected to one end of each spring, a pin is fixedly connected to the middle of the baffle, and a limit block is fixedly connected to one end of the pin. A storage slot is provided inside the two ends of the lower mold behind the rectangular slots. As a further description of the above technical solution: The lower mold has two arc-shaped grooves on its surface, and a roller core abuts between the lower mold and the upper mold. As a further description of the above technical solution: The extrusion ring is inserted into the arc-shaped groove, and the output end of the electric push rod passes through the bracket and is fixedly connected to the side of the inclined block near the rectangular groove. As a further description of the above technical solution: The top outer side of the slide rod is slidably connected to the inside of both ends of the lower mold, and the spring is sleeved on the outer side of the slide rod; As a further description of the above technical solution: One end of the spring is fixedly connected to the top wall of the bracket, and the pulley abuts against the surface of the inclined block; As a further description of the above technical solution: The second spring is sleeved on the outside of the pin, the pin passes through both sides of the second rectangular groove, and the baffle is slidably connected inside the second rectangular groove; As a further description of the above technical solution: The limiting block has an arc shape on one side, and the limiting block is inserted into the inside of the roller core and the receiving groove.

[0005] This utility model has the following beneficial effects: 1. In this utility model, the automatic ejection of the roller core is achieved through the linkage of electric push rod, inclined block, pulley and spring. The ejection force and stroke can be controlled to avoid damage to the rubber layer due to uneven external force, ensure the cylindricity of the finished rubber roller, improve the yield rate, and solve the problem that it is difficult for operators to directly remove it from the cavity smoothly. During the removal process, improper force can easily damage and deform the surface of the rubber roller, affecting the product quality.

[0006] 2. In this utility model, the structure design of spring elastic reset and arc-shaped limiting block allows for quick replacement of roller cores of different sizes without replacing the entire set of molds. Production specifications can be switched through simple plugging and unplugging and reset actions, reducing the mold procurement cost for producing multiple types of rubber rollers. Moreover, the adaptation process does not require complicated debugging, shortening the changeover time and improving the production line's response speed to diversified market demands. Attached Figure Description

[0007] Figure 1This is a three-dimensional schematic diagram of an overmolding injection mold proposed in this utility model; Figure 2 This is a schematic diagram of the arc-shaped groove of an overmolding injection mold proposed in this utility model; Figure 3 This is a schematic diagram of the extrusion ring of an overmolded injection mold proposed in this utility model; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the structure of a limiting block for an overmolding injection mold proposed in this utility model.

[0008] Legend: 1. Lower mold; 2. Upper mold; 3. Arc groove; 4. Mounting groove; 5. Rectangular groove one; 6. Electric push rod; 7. Bracket; 8. Inclined block; 9. Slide rod; 10. Disc; 11. Pulley; 12. Spring one; 13. Extrusion ring; 14. Rectangular groove two; 15. Spring two; 16. Baffle; 17. Pin; 18. Storage groove; 19. Limiting block; 20. Roller core. Detailed Implementation

[0009] 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.

[0010] Reference Figures 1-4This utility model provides an embodiment of a rubber-coating injection mold, including a lower mold 1 and an upper mold 2 on top of the lower mold 1. When the two are closed, they form a cavity that matches the shape of the rubber roller, providing a closed space for injection molding and ensuring the coating accuracy of the roller core 20 by the lower mold 1 and the upper mold 2. An ejection assembly is provided inside the lower mold 1 to automatically eject the molded rubber roller from the cavity formed by the lower mold 1 and the upper mold 2, avoiding damage to the rubber layer on the surface of the roller core 20 during manual removal. A replacement assembly is provided inside the lower mold 1 to accommodate roller cores 20 of different sizes, improving the mold's applicability to diverse production needs. The ejection assembly includes two mounting slots 4, providing installation space for the electric push rod 6 and the bracket 7, ensuring a reasonable layout of each component. The mounting slots 4 are respectively set inside the two ends of the lower mold 1, symmetrically distributed to ensure balanced ejection force on the roller core 20 and prevent the roller core 20 from tilting during ejection. A rectangular slot 5 is opened on one side of each mounting slot 4 to accommodate and fix the electric push rod 6, limiting the displacement of the electric push rod 6 and ensuring its working stability. The electric push rod 6 is fixedly connected to the inner wall of the rectangular slot 5, serving as the power source for the ejection action and providing stable thrust for the sliding of the inclined block 8. A bracket 7 is fixedly connected to the inner wall of the mounting slot 4, providing support and guidance for the sliding of the inclined block 8 and the lifting of the slide rod 9, ensuring accurate movement trajectory of the components. The inclined block 8 is slidably connected to the bottom wall of the bracket 7. By sliding along the bottom wall of the bracket 7, the inclined surface drives the pulley 11 to rise, realizing the conversion of horizontal power to vertical power. A sliding rod 9 is slidably connected to the top of the support 7, allowing it to slide vertically along the top of the support 7. This transmits the lifting force of the pulley 11 to the extrusion ring 13. A disc 10 is fixedly connected to the bottom of the sliding rod 9, serving to connect the pulley 11 and the sliding rod 9, and also providing a lower force point for the spring 12. The top of the sliding rod 9 passes through the lower mold 1 and is fixedly connected to the extrusion ring 13, directly contacting the roller core 20 and applying an ejection force. Its arc-shaped structure is adapted to the outer circle of the roller core 20. A spring 12 is fixedly connected to the top of the disc 10. After the ejection action is completed, the spring 12 uses its own elasticity to reset the disc 10, the sliding rod 9, and the extrusion ring 13, preparing for the next ejection. A pulley 11 is fixedly connected to the bottom of the disc 10, allowing it to roll along the surface of the inclined block 8, reducing frictional resistance and simultaneously leveling the inclined block 8. The motion is converted into the vertical motion of the slide bar 9. Two arc-shaped grooves 3 are opened on the surface of the lower mold 1 to provide a guide channel for the lifting and lowering of the extrusion ring 13, avoiding motion interference between the extrusion ring 13 and the lower mold 1, and ensuring that the extrusion ring 13 is accurately ejected along the axial direction of the roller core 20. The roller core 20, which serves as the base material of the rubber roller, is covered by the rubber material during the injection molding process and is the core processing object of the mold. The extrusion ring 13 is inserted into the arc-shaped groove 3 to ensure that the extrusion ring 13 moves along the trajectory of the arc-shaped groove 3, ensuring accurate ejection direction of the roller core 20. The output end of the electric push rod 6 passes through the bracket 7 and is fixedly connected to the side of the inclined block 8 near the rectangular groove 5, so that the electric push rod 6 can directly drive the inclined block 8 to slide along the bottom wall of the bracket 7, resulting in efficient and lossless power transmission.The top outer side of the slide rod 9 is slidably connected to the inside of both ends of the lower mold 1, restricting the slide rod 9 to move only in the vertical direction, preventing lateral displacement, and ensuring stability in the ejection direction. Spring 12 is sleeved on the outside of the slide rod 9, saving installation space and ensuring that the extension and retraction direction of spring 12 is consistent with the movement direction of the slide rod 9, guaranteeing stable transmission of the reset force. The top of spring 12 is fixedly connected to the top wall of the bracket 7, providing a fixed force point at the upper end of spring 12, ensuring stable compression when the disc 10 rises and effective release of elasticity during reset. Pulley 11 abuts against the surface of the inclined block 8, ensuring that the inclined block 8 can push pulley 11 upwards through the inclined surface when sliding, achieving continuous power conversion.

[0011] Reference Figures 1-3 and Figure 5The replacement components include two rectangular slots 14, providing installation and movement space for spring 15 and baffle 16, ensuring coordinated operation of the components. The two rectangular slots 14 are respectively located inside both ends of the lower mold 1, above the ejector assembly, and distributed vertically with the ejector assembly to avoid interference between the two during movement, thus optimizing the internal space layout of the mold. Spring 15 is fixedly connected to one side of rectangular slot 14, providing continuous elastic preload to limit block 19, ensuring it tightly engages with roller core 20 and preventing roller core 20 from shifting during injection molding. Baffle 1 is fixedly connected to one end of spring 15. 6. The elastic force of spring 15 is transmitted to pin 17 and limit block 19, while limiting the extension and retraction direction of spring 15 to prevent lateral deformation. Pin 17 is fixedly connected to the middle of baffle 16, serving as a rigid structure connecting baffle 16 and limit block 19, transmitting the force of baffle 16, and driving limit block 19 to extend and retract. One end of pin 17 is fixedly connected to limit block 19, directly contacting roller core 20, and achieving precise positioning of roller core 20 through snap-fit, preventing roller core 20 from shaking during injection molding. The interior of both ends of the lower mold 1 is provided behind rectangular groove 14. The receiving groove 18 provides space for the retracted limiting block 19 when the roller core 20 is replaced, preventing the limiting block 19 from obstructing the loading and unloading of the roller core 20. Spring 2 15 is sleeved on the outside of pin 17, ensuring that the extension and retraction direction of spring 2 15 is consistent with the movement direction of pin 17, guaranteeing efficient transmission of elastic force to the limiting block 19. Pin 17 is inserted on both sides of rectangular groove 2 14, restricting pin 17 to move only in the horizontal direction, ensuring accurate extension and retraction trajectory of the limiting block 19. Baffle 16 is slidably connected inside rectangular groove 2 14, allowing baffle 16 to slide smoothly along rectangular groove 2 14, ensuring… The elastic force of spring 15 is evenly transmitted to pin 17. One side of the limiting block 19 is arc-shaped. When roller cores 20 of different sizes are placed in, the arc-shaped surface can guide the roller core 20 to smoothly squeeze the limiting block 19 to shrink, reduce installation resistance, and improve the efficiency of changing the shape. The limiting block 19 is inserted into the inside of the roller core 20. Through the matching snap-fit ​​with the roller core 20, the limiting block 19 can achieve stable positioning of roller cores 20 of different sizes, ensuring injection molding accuracy. The limiting block 19 is inserted into the storage groove 18. When changing the roller core 20, it can be completely retracted into the storage groove 18 to avoid the limiting block 19 protruding and obstructing the picking and putting-in operation of the roller core 20.

[0012] Working principle: When the roller core 20 needs to be extruded from the mold, the pin 17 is pulled outward, the electric push rod 6 starts and extends, and its output end pushes the inclined block 8 to slide on the bottom wall of the bracket 7. Since the slide rod 9 is limited by the bracket 7 and the lower mold 1, it can only move up and down in the vertical direction, while the pulley 11 abuts against the surface of the inclined block 8. As the inclined block 8 slides, the pulley 11 will roll upward along the inclined surface of the inclined block 8. During this rolling process, the pulley 11 drives the disc 10 and the parts fixedly connected to the disc 10. As the slide bar 9 moves upward, the extrusion ring 13 at the top of the slide bar 9 also moves upward within the arc-shaped groove 3. Simultaneously, the upward movement of the disc 10 compresses the spring 12. When the extrusion ring 13 moves upward, it contacts the roller core 20 and applies an upward force, overcoming the friction between the roller core 20 and the mold, thus ejecting the roller core 20 from the cavity of the lower mold 1, completing the part removal action. When the electric push rod 6 retracts, the inclined block 8 moves back, the spring 12 returns to its original deformation, causing the disc 10, slide bar 9, and extrusion ring 13 to reset. To prepare for the next injection molding, if a different sized roller core 20 needs to be replaced, pull the pin 17 outward. The pin 17 moves the baffle 16 within the rectangular groove 14, compressing the spring 15. This causes the limiting block 19 to be pulled out of the limiting structure of the current roller core 20 and stored in the receiving groove 18, releasing the limitation on the current roller core 20. After removing the current roller core 20 and inserting the new sized roller core 20, release the pin 17. The spring 15, relying on its own elasticity, pushes the baffle 16 back, thereby moving the pin 17. 7 and the limiting block 19 are reset. Because one side of the limiting block 19 is arc-shaped, during the insertion of the new roller core 20, the roller core 20 will squeeze the limiting block 19 to temporarily contract it. After the roller core 20 is placed in place, the limiting block 19 pops out with the help of the elastic force of the second spring 15 and locks into the corresponding limiting position of the new roller core 20. Different sizes of roller cores 20 can be effectively locked by designing a matching limiting structure, so as to realize the positioning of different sizes of roller cores 20 and complete the replacement of roller cores 20 to meet production needs.

[0013] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An overmoulding mould comprising a lower mould (1), characterised in that: The lower mold (1) is provided with an upper mold (2) on its top, and the lower mold (1) is provided with an ejection assembly inside, and the lower mold (1) is provided with a replacement assembly inside; The ejection assembly includes two mounting slots (4), which are respectively located inside the two ends of the lower mold (1). A rectangular slot (5) is provided on one side of each of the two mounting slots (4). An electric push rod (6) is fixedly connected to the inner wall of the rectangular slot (5). A bracket (7) is fixedly connected to the inner wall of the mounting slot (4). An inclined block (8) is slidably connected to the bottom wall of the bracket (7). A sliding rod (9) is slidably connected to the top of the bracket (7). A disc (10) is fixedly connected to the bottom end of the sliding rod (9). An extrusion ring (13) is fixedly connected to the top end of the sliding rod (9) through the lower mold (1). A spring (12) is fixedly connected to the top end of the disc (10). A pulley (11) is fixedly connected to the bottom end of the disc (10).

2. An overmolding mold according to claim 1, characterized in that: The replacement component includes two rectangular slots (14), which are respectively located inside the two ends of the lower mold (1) above the ejection component. A spring (15) is fixedly connected to one side of the rectangular slot (14), and a baffle (16) is fixedly connected to one end of the spring (15). A pin (17) is fixedly connected to the middle of the baffle (16), and a limit block (19) is fixedly connected to one end of the pin (17). A storage slot (18) is provided inside the two ends of the lower mold (1) behind the rectangular slots (14).

3. An overmolding mold according to claim 1, characterized in that: The lower mold (1) has two arc-shaped grooves (3) on its surface, and a roller core (20) abuts between the lower mold (1) and the upper mold (2).

4. An overmolding mold according to claim 1, characterized in that: The extrusion ring (13) is inserted into the arc groove (3), and the output end of the electric push rod (6) passes through the bracket (7) and is fixedly connected to the side of the inclined block (8) near the rectangular groove (5).

5. An overmolding mold according to claim 1, characterized in that: The top outer side of the slide rod (9) is slidably connected to the inside of both ends of the lower mold (1), and the spring (12) is sleeved on the outer side of the slide rod (9).

6. An overmolding mold according to claim 1, characterized in that: The top of the spring (12) is fixedly connected to the top wall of the bracket (7), and the pulley (11) abuts against the surface of the inclined block (8).

7. An overmolding mold according to claim 2, characterized in that: The second spring (15) is sleeved on the outside of the pin (17), the pin (17) is inserted through both sides of the second rectangular groove (14), and the baffle (16) is slidably connected inside the second rectangular groove (14).

8. An overmolding mold according to claim 2, characterized in that: The limiting block (19) has an arc shape on one side, and the limiting block (19) is inserted into the roller core (20) and the receiving groove (18).

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