Automatic sprue removal structure

Abstract

The utility model discloses an automatic sprue structure of taking off, including dental core, transmission assembly and ejection assembly, dental core top end sets the sprue groove, and the sprue groove is used to accommodate the sprue of injection molding material formation, transmission assembly is connected with dental core to drive dental core to carry out the rotation movement, and make product and sprue separate, the thread type cavity groove of dental core side surface setting in the rotation process, with the thread structure of product inner wall relatively moves, and this relative movement makes the thread bite cooperation between dental core and product gradually reduce, until dental core and product loosen, ejection assembly is used for after dental core rotates and will sprue from dental core on top, and push the pipe and take out product from dental core on top, because in the demoulding before through dental core rotation makes product and dental core loosen, the binding force between product and dental core greatly reduces, avoided the product deformation problem of traditional demolding mode because of local excessive stress, and the sprue is taken out from the sprue groove of dental core when the ejector pin rises, realized the quick separation of sprue and dental core.

Description

Technical Field

[0001] This utility model relates to the field of gate removal structure technology, specifically an automatic gate removal structure. Background Technology

[0002] With the widespread application of injection molding technology in industrial production, the requirements for product quality and production efficiency are constantly increasing. As a common gate type, side gate has the advantages of simple structure, convenient processing and wide applicability, and has been widely used in injection molds.

[0003] After the product with a threaded structure is molded, the bonding force between the product and the core is large due to the interlocking effect of the threads. Traditional ejection demolding methods are difficult to make the product detach smoothly from the core. If forced ejection is performed, the threads of the product may be torn or damaged, or the surface of the core may be worn, affecting the service life of the mold and the quality of the product.

[0004] Furthermore, during the demolding process, due to the large friction and bonding forces between the product and the core, traditional demolding methods may subject the product to uneven forces, resulting in deformation. This is especially true for some thin-walled, complex-shaped threaded plastic products, where traditional demolding methods may distort the product's shape and fail to meet design requirements. Utility Model Content

[0005] In order to overcome the shortcomings of existing technical solutions, this utility model provides an automatic gate removal structure, which can effectively solve the technical problems raised in the background art.

[0006] The technical solution adopted by this utility model to solve its technical problem is: an automatic gate removal structure, including a core, a transmission component and an ejection component. A gate groove is provided at the top of the core for accommodating the gate formed by the injection molding material. The transmission component is connected to the core to drive the core to rotate and separate the product from the gate. The ejection component is used to eject the gate from the core after the core rotates.

[0007] Furthermore, the transmission assembly includes a driving member, a drive gear, and a transmission gear. The tooth core is formed with a meshing part. The driving member drives the drive gear to rotate. The drive gear meshes with the transmission gear. The transmission gear further meshes with the meshing part of the tooth core, causing the tooth core to rotate.

[0008] Furthermore, the ejection assembly includes an ejector plate and an ejector pin. The ejector pin is mounted on the ejector plate and moves up and down together with it. When the ejector pin rises, it ejects the gate from the gate slot of the core.

[0009] Furthermore, a sliding groove is provided in the center of the tooth core, and the sliding groove is connected to the gate groove. The ejector pin is located inside the sliding groove, and the ejector pin is coaxial with the sliding groove and slides along the sliding groove.

[0010] Furthermore, the tooth core has a threaded cavity groove on its side for forming the internal thread structure of the molded product, a protrusion is formed at the top of the tooth core, a gate groove is located at the center of the protrusion, and a glue injection channel is provided on the side of the protrusion. The glue injection channel is connected to the gate groove to form a lateral glue injection path.

[0011] Furthermore, an anti-rotation tooth insert is coaxially mounted on the outer side of the tooth core. The anti-rotation tooth insert is used to prevent rotation of the inner wall of the molded product. A push tube is fitted on the outer side of the anti-rotation tooth insert. The push tube is used to push the product out of the tooth core during demolding.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] The transmission component is connected to the tooth core, which drives the tooth core to rotate. The tooth core drives the gate to rotate together, thereby separating the gate from the product. Since the separation process between the gate and the product is accomplished by the rotation of the tooth core, the force generated by the rotation is evenly distributed and continuous. Unlike the traditional gate removal method, it does not produce sudden and excessive impact force. This uniform force transmission method can effectively avoid excessive impact on the thread structure of the product, thereby protecting the integrity and fitting accuracy of the thread structure and ensuring that the product can still meet the thread performance requirements of the design after the gate is removed.

[0014] During rotation, the threaded cavity groove on the side of the tooth core moves relative to the threaded structure on the inner wall of the product. This relative movement gradually reduces the thread engagement between the tooth core and the product until the tooth core and the product are released. This step creates favorable conditions for the subsequent demolding operation.

[0015] Subsequently, the ejector pushes the product out of the core. Because the product is loosened from the core by rotating it before demolding, the bonding force between the product and the core is greatly reduced. Therefore, the resistance encountered by the ejector when ejecting the product is relatively uniform, avoiding the product deformation problem caused by excessive local force in traditional demolding methods. At the same time, when the ejector pin rises, it pushes the gate out of the gate groove of the core, realizing the rapid separation of the gate and the core. Attached Figure Description

[0016] Figure 1 This is a diagram showing the separation structure of the gate and the core.

[0017] Figure 2 This is a cross-sectional view of the tooth core;

[0018] Figure 3 This is a schematic diagram of the transmission assembly.

[0019] Figure 4 A three-dimensional diagram of the tooth core;

[0020] Figure 5 This is a schematic diagram of the overall structure of an injection mold with an automatic gate removal mechanism.

[0021] Figure 6 This is a cross-sectional view of an injection mold with an automatic gate removal structure;

[0022] Figure 7 for Figure 6 Enlarged view of the structure of part A in the middle.

[0023] Numbering on the map:

[0024] 1. Hot runner plate; 2. Fixed mold base plate; 3. Cavity plate; 4. Moving mold support plate; 5. Moving mold base plate; 6. Ejector plate; 7. Screw; 8. Inner re-threaded sleeve; 9. First spring; 10. Second limit screw; 11. Second spring; 12. Ejector pin; 13. Product; 14. Gate; 15. Main runner; 16. Sub-runner; 17. Sprue; 18. First limit screw; 19. First front mold insert; 20. Second front mold insert; 21. Tooth core; 22. Sprue groove; 23. Engaging part; 24. Sliding groove; 25. Ejector tube; 26. Anti-rotation tooth insert; 28. Transmission gear; 29. ​​Drive gear; 30. Groove; 31. Threaded cavity groove; 32. Protrusion; 33. Injection channel; 34. Boost; 35. Ejector rod. Detailed Implementation

[0025] 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.

[0026] like Figure 1-4As shown, this utility model provides an automatic gate removal structure, including a core 21, a transmission assembly, and an ejection assembly. The core 21 has a gate groove 22 at its top for accommodating a gate 14 formed from injection molding material. The core 21 also has a threaded cavity groove 31 on its side for the internal thread structure of the molded product 13. A protrusion 32 is formed at the top of the core 21, with the gate groove 22 located at its center. A glue injection channel 33 is formed on the side of the protrusion 32, communicating with the gate groove 22 to form a lateral glue injection path. A sliding groove 24 communicating with the gate groove 22 is formed at the center of the core 21. The core 21 also has... In addition to the meshing part 23, an anti-rotation tooth insert 26 is coaxially mounted on the outer side of the tooth core 21. The anti-rotation tooth insert 26 is used to prevent rotation of the inner wall of the molded product 13. Specifically, the top surface of the anti-rotation tooth insert 26 is provided with a plurality of spaced protrusions 34. Two adjacent protrusions 34 are spaced to form a groove 30. During molding, the inner wall of the product 13 is formed with anti-rotation blocks. During the process of the tooth core 21 driving the gate 14 to rotate, the product 13 remains stationary relative to the tooth core 21 under the cooperation of the anti-rotation blocks and protrusions 34. The outer side of the anti-rotation tooth insert 26 is fitted with a push tube 25. The push tube 25 is used to push the product 13 out of the tooth core 21 during demolding.

[0027] The transmission assembly is connected to the tooth core 21 and drives the tooth core 21 to rotate. Specifically, the transmission assembly includes a driving component, a drive gear 29, and a transmission gear 28. The driving component includes a screw 7 and an inner multi-threaded sleeve 8. One end of the screw 7 is connected to the fixed mold assembly. The outer wall of the screw 7 is provided with teeth. The inner wall of the inner multi-threaded sleeve 8 meshes with the teeth. Therefore, when the moving mold assembly moves away from the fixed mold assembly, the screw 7 rotates the inner multi-threaded sleeve 8. The inner multi-threaded sleeve 8 meshes with the drive gear 29. The drive gear 29 further meshes with the transmission gear 28. The tooth core 21 is formed with a meshing part 23. The transmission gear 28 meshes with the meshing part 23 of the tooth core 21, causing the tooth core 21 to rotate. The tooth core 21 drives the gate 14 to rotate together, realizing the separation of the product 13 and the gate 14.

[0028] The ejection assembly is used to eject the gate 14 from the core 21 after the core 21 rotates, and to push the product 13 out of the anti-rotation tooth insert 26. Specifically, the ejection assembly includes an ejector plate 6, an ejector pin 12, and a push rod 35. The ejector pin 12 and the push rod 35 are mounted on the ejector plate 6 and move up and down together. The mold pushes the ejector plate 6 to move up. When the ejector pin 12 rises, it ejects the gate 14 from the gate groove 22 of the core 21. When the push rod 35 rises, it drives the moving mold support plate 4 and the push tube 25 to move forward. At this time, the push tube 25 pushes the product 13 out of the anti-rotation tooth insert 26.

[0029] In one embodiment, as shown in 5-7, the injection mold includes a fixed mold assembly and a moving mold assembly. An automatic gate 14 is structurally disposed on the moving mold assembly. The moving mold assembly includes a moving mold base plate 5 and a moving mold support plate 4. The fixed mold assembly includes a fixed mold base plate 2, a cavity plate 3, a hot runner plate 1, a main runner 15 disposed within the hot runner plate 1, and a branch runner 16 connected to the main runner 15. The cavity plate 3 is fitted with a first front mold insert 19 and a second front mold insert 20. The first front mold insert 19 is fitted onto the outside of the second front mold insert 20, and the first front mold insert 19 and the second front mold insert 20 constitute a cavity for molding the shape of the plastic product 13. The mold base plate 2 is equipped with nozzles 17 corresponding to the number of runners 16. The nozzles 17 are provided with melt flow channels. The ends of the runners 16 are connected to the melt flow channels, so that each product 13 is provided with one nozzle 17. On the one hand, the mold parting surface is reduced, and the melt enters the melt flow channel of the nozzle 17 directly through the runners 16, which reduces the problem of uneven melt distribution in the runner network 16. On the other hand, it can effectively reduce the flow path length of the melt from the main runner 15 to the product 13, reduce the heat loss and pressure drop of the melt during the flow process, and the shortening of the melt flow path and the uniformity of filling reduce the residual stress inside the product 13.

[0030] It also includes a first limiting component and a second limiting component. The first limiting component includes a first limiting screw 18 and a first spring 9 fitted on its outer side. The second limiting component includes a second limiting screw 10 and a second spring 11 fitted on its outer side. The first spring 9 and the second spring 11 are used to spring open the moving mold support plate 4 and the moving mold base plate 5. When the fixed mold assembly and the moving mold assembly are closed, the first spring 9 and the second spring 11 are compressed. After the mold is opened, the first spring 9 and the second spring 11 will spring open the moving mold support plate 4 and the moving mold base plate 5. The product 13 moves together with the moving mold support plate 4 and the moving mold base plate 5. The product 13 has a displacement relative to the tooth core 21.

[0031] Working principle:

[0032] Driven by the injection molding machine's clamping system, the moving mold assembly moves towards the fixed mold assembly. The mating surfaces of the moving mold assembly and the fixed mold assembly fit together with high precision to form a closed cavity. Plastic granules, driven by the injection molding machine's feeder, are heated and melted before entering the hot runner. The main runner 15 in the hot runner distributes the molten plastic to various branch runners 16, reaching the gate 14 of the mold cavity. During the injection process, the molten plastic flows into the gate groove 22 and then along the side injection path into the mold cavity until the molten plastic fills the entire mold cavity. During the filling process, under high pressure, the molten plastic tightly adheres to the threaded cavity groove 31 of the core 21 and the anti-rotation insert 26, forming the shape of the product 13 and its relationship with the product 13. When the mold is opened, the injection molding machine moves the moving mold assembly and separates it from the fixed mold assembly. The screw 7 rotates the inner reamer sleeve 8, which drives the drive gear 29 to rotate. The drive gear 29 meshes with the transmission gear 28, and the transmission gear 28 further meshes with the meshing part 23 of the tooth core 21, thereby driving the tooth core 21 to rotate. During the rotation of the tooth core 21, the gate 14 rotates, causing the gate 14 to separate from the product 13. In addition, the threaded cavity groove 31 provided on the side of the tooth core 21 moves relative to the threaded structure on the inner wall of the product 13 during the rotation, causing the tooth core 21 to loosen from the product 13. Under the action of the anti-rotation block and the protrusion 34, the product 13 remains stationary relative to the tooth core 21.

[0033] Furthermore, during mold opening, the first spring 9 and the second spring 11 spring the moving mold support plate 4 and the moving mold base plate 5 apart, and the product 13 moves together with the moving mold support plate 4 and the moving mold base plate 5. The product 13 is displaced relative to the tooth core 21. The mold pushes the ejector plate 6 upward. When the ejector pin 12 rises, it pushes the gate 14 out of the gate groove 22 of the tooth core 21. When the push rod 35 rises, it drives the moving mold support plate 4 and the push tube 25 forward. At this time, the push tube 25 pushes the product 13 out of the anti-rotation tooth insert 26.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An automatic gate removal structure, characterized in that, The device includes a core, a transmission assembly, and an ejection assembly. The core has a gate groove at its top for receiving the gate formed by the injection molding material. The transmission assembly is connected to the core to drive the core to rotate and separate the product from the gate. The ejection assembly ejects the gate from the core after it rotates.

2. The automatic gate removal structure according to claim 1, characterized in that, The transmission assembly includes a driving component, a drive gear, and a transmission gear. The tooth core is formed with a meshing part. The driving component drives the drive gear to rotate. The drive gear meshes with the transmission gear. The transmission gear further meshes with the meshing part of the tooth core, causing the tooth core to rotate.

3. The automatic gate removal structure according to claim 1, characterized in that, The ejection assembly includes an ejector plate and an ejector pin. The ejector pin is mounted on the ejector plate and moves up and down together with it. When the ejector pin rises, it ejects the gate from the gate slot of the core.

4. The automatic gate removal structure according to claim 3, characterized in that, The tooth core has a sliding groove in the center, which is connected to the gate groove. The ejector pin is located inside the sliding groove, and is coaxial with the sliding groove and slides along the sliding groove.

5. The automatic gate removal structure according to claim 4, characterized in that, The tooth core has a threaded cavity groove on its side for forming the internal thread structure of the product. A protrusion is formed at the top of the tooth core. A gate groove is located at the center of the protrusion. An injection channel is provided on the side of the protrusion. The injection channel is connected to the gate groove to form a lateral injection path.

6. The automatic gate removal structure according to claim 1, characterized in that, An anti-rotation tooth insert is coaxially mounted on the outer side of the tooth core. The anti-rotation tooth insert is used to prevent rotation of the inner wall of the molded product. A push tube is fitted on the outer side of the anti-rotation tooth insert. The push tube is used to push the product out of the tooth core during demolding.

Images