A mass injection molding device for processing sealing rings

Abstract

The present invention discloses a batch injection molding device for the processing of sealing rings, which relates to the technical field of injection molding of sealing rings. Due to the large contact area and friction force between the cavities of the sealing ring mold, when the mold is opened, the sealing ring cannot be separated from the mold cavity. The traditional demolding method mainly relies on the ejection mechanism of the mold. However, the wall of the sealing ring is relatively thin, and the ejection force of the ejection structure will cause it to deform or even break, affecting the service life of the mold and the stability of production. The present invention uses the damping ring of the spring rod to control the separation speed of the fixed mold and the positioning plate, and makes the first cavity deform through the traction block and the extension belt, and actively separates from the rubber ring, reducing the damage of the rubber ring due to uneven force or excessive local pressure during demolding. Especially for the sealing ring at the inner ring of the first cavity, it can be gradually peeled off, minimizing the impact on the product, and overall improving the quality and efficiency of the injection molding of the sealing ring processing.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding of sealing rings, and specifically to a batch injection molding device for processing sealing rings. Background Art

[0002] Injection molding is one of the main processing methods for manufacturing sealing rings. In this process, plastic raw materials are heated and melted in an injection molding machine to a molten state, and then the molten material is injected into a pre-designed mold cavity under a certain pressure. After cooling and solidifying, a sealing ring product with a specific shape and size is formed.

[0003] In this regard, the patent document with publication number CN114953333B discloses an injection molding device, including a shot sleeve base assembly, a plasticizing assembly, and a lead screw assembly. The plasticizing assembly is connected to the lead screw assembly, and the lead screw assembly passes through the shot sleeve base assembly. The shot sleeve base assembly is provided with openings on the left and right sides along the first direction. The lead screw assembly drives the plasticizing assembly to perform injection actions on the shot sleeve base assembly. An injection molding machine is also provided, including the injection molding device as described above. The injection molding device and the injection molding machine provided by this invention change the installation direction of the plasticizing seat assembly, so that the shot sleeve base assembly is not easily deformed when stressed, and it is also convenient for processing. The injection guide rail is installed on the side wall of the bottom plate. When the shot sleeve base assembly is stressed, the slider moves in a direction perpendicular to the injection direction, and the guide rail and the slider are not easily damaged. Changing the installation position of the plasticizing assembly is easy for installation and maintenance.

[0004] Due to the large contact area and friction force between the mold cavities of the sealing ring, when the mold is opened, the sealing ring cannot be detached from the mold cavity. The traditional demolding method mainly relies on the ejection mechanism of the mold. However, the wall of the sealing ring is relatively thin, and the ejection force of the ejection structure will cause it to deform or even break, affecting the service life of the mold and the stability of production.

[0005] In view of the above problems, a batch injection molding device for processing sealing rings is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a batch injection molding device for processing sealing rings, which solves the problem of difficult demolding in the background art.

[0007] To achieve the above object, the present invention provides the following technical solution: A batch injection molding device for processing sealing rings, including an operation platform, on the top surface of which an injection extrusion machine is connected. On the top surface of the injection extrusion machine, a feed hopper is installed. On the top surface of the operation platform, a positioning plate is also connected. An extrusion pipe is embedded inside the injection extrusion machine. On one side of the positioning plate, a demolding assembly is connected. The demolding assembly includes a spring rod, which is fixedly connected to the positioning plate. One end of the spring rod away from the positioning plate is connected to a fixed mold. The fixed mold and the positioning plate are connected by the spring rod. A perfusion pipe is embedded inside the fixed mold. The perfusion pipe is connected to the extrusion pipe. A first mold cavity is opened inside the fixed mold. A perfusion port is opened on the inner wall of the first mold cavity. A lining groove is opened inside the fixed mold. A discharge pipe is also embedded inside the fixed mold;

[0008] A traction block is embedded inside the lining groove. The end of the extension belt is connected to the traction block. One end of the traction block away from the extension belt is connected to the positioning plate. A water injection pipe is embedded inside the discharge pipe. A second mold cavity is opened inside the moving mold. A water injection pipe is embedded inside the moving mold. One end of the water injection pipe is connected to a support block, and the support block corresponds to the lining groove.

[0009] Preferably, a cooling water tank is embedded inside the operation platform. The cooling water tank is arranged directly below the fixed mold and the moving mold, and is used to cool the demolded sealing ring.

[0010] Preferably, a hydraulic push rod is also installed on the top end of the operation platform. The output end of the hydraulic push rod is connected to the moving mold, and the hydraulic push rod is used to control the horizontal movement of the moving mold.

[0011] Preferably, the horizontal movement of the moving mold wraps around the fixed mold until the second mold cavity inside the moving mold and the first mold cavity inside the fixed mold are completely engaged to form a sealed chamber, and then the horizontal movement of the moving mold stops.

[0012] Preferably, a through hole is opened on the surface of the perfusion pipe. The perfusion pipe penetrates through the outer wall of the fixed mold and extends into the interior of the fixed mold. The perfusion pipe is rotatably connected to the fixed mold.

[0013] Preferably, when the through hole on the perfusion pipe corresponds to the perfusion port, the perfusion pipe, the perfusion port and the interior of the first mold cavity are connected and communicated. The molten injection molding raw material is transported through the positioning plate into the interior of the perfusion pipe and finally fills the interiors of the first mold cavity and the second mold cavity.

[0014] Preferably, the discharge pipe penetrates through the interior of the fixed mold, and the bottom end is attached to the surface of the perfusion pipe. The discharge pipe is adapted to the through hole opened on the perfusion pipe.

[0015] Preferably, the first mold cavity is arranged in an annular structure. The inner ring wall of the first mold cavity is made of silica gel. Pouring ports are provided on the inner walls of both the first mold cavity and the second mold cavity.

[0016] Preferably, the extension belt is arranged in a U shape. The extension belt is divided into a fixed part, a bending part, and a flexible part. The flexible part of the extension belt is fixedly connected to one side of the inner wall of the lining groove close to the center of the circle. The end of the flexible part is connected to a bending part. The side of the bending part away from the flexible part is connected to a fixed part, and the fixed part is arranged on the outer side of the inner wall of the lining groove.

[0017] Preferably, the support block is embedded inside the lining groove, and the extension belt is wrapped around the support block.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. A batch injection molding device for processing sealing rings provided by the present invention effectively solves the problem of air in the starting section of the raw material causing air pockets in the sealing ring through the pouring pipe and the discharge pipe, improving the product quality. Secondly, the damping ring of the spring rod is used to control the separation speed of the fixed mold and the positioning plate, and the first mold cavity deforms through the traction block and the extension belt, actively separating from the rubber ring, reducing the damage of the rubber ring due to uneven force or excessive local pressure during demolding. Especially for the sealing ring at the inner ring of the first mold cavity, it can be gradually peeled off, minimizing the impact on the product, and overall improving the quality and efficiency of the injection molding of the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 is a structural schematic diagram of the fixed mold and the moving mold of the present invention;

[0022] Figure 3 is a structural schematic diagram of the positioning plate and the spring rod of the present invention;

[0023] Figure 4 is a structural schematic diagram of the first mold cavity of the present invention;

[0024] Figure 5 is a structural schematic diagram of the present invention in the state of the extension belt and the traction block;

[0025] Figure 6 is a structural schematic diagram of the separation state of the moving mold and the fixed mold of the present invention;

[0026] Figure 7 is a three-dimensional structural schematic diagram of the operation platform and the cooling water tank of the present invention;

[0027] Figure 8This is an exploded structural schematic diagram of the fixed mold and the moving mold of the present invention's structure.

[0028] In the figure: 11, operation platform; 12, injection molding extruder; 13, feed hopper; 14, fixed mold; 15, moving mold; 16, hydraulic push rod; 17, cooling water tank; 18, positioning plate; 19, extrusion pipe; 2, demolding assembly; 21, first mold cavity; 22, spring rod; 23, filling port; 24, filling pipe; 25, discharge pipe; 26, lining groove; 27, extension belt; 28, traction block; 29, support block; 30, water injection pipe; 31, second mold cavity. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] To further understand the content of the present invention, the present invention will be described in detail in conjunction with the accompanying drawings.

[0031] Combined with Figures 1-8 , a batch injection molding device for processing sealing rings of the present invention includes an operation platform 11. The top surface of the operation platform 11 is connected with an injection molding extruder 12. The top surface of the injection molding extruder 12 is provided with a feed hopper 13. The top surface of the operation platform 11 is also connected with a positioning plate 18. An extrusion pipe 19 is embedded in the injection molding extruder 12. In the process of processing the sealing ring, by putting the masterbatch into the interior of the feed hopper 13, heating the masterbatch by the injection molding extruder 12 to make it in a molten state, and then transporting the raw material into the interior of the extrusion pipe 19 by the injection molding extruder 12, and then pouring it into the interior of the fixed mold 14, the processing and forming of the rubber ring are realized;

[0032] One side of the positioning plate 18 is connected with a demolding assembly 2. The demolding assembly 2 includes a spring rod 22. The spring rod 22 is fixedly connected to the positioning plate 18. One end of the spring rod 22 away from the positioning plate 18 is connected with a fixed mold 14. A cooling water tank 17 is embedded inside the operation platform 11. The cooling water tank 17 is arranged directly below the fixed mold 14 and the moving mold 15. The cooling water tank 17 is used to cool the demolded sealing ring. A hydraulic push rod 16 is also installed at the top of the operation platform 11. The output end of the hydraulic push rod 16 is connected with a moving mold 15. The hydraulic push rod 16 is used to control the horizontal movement of the moving mold 15. The horizontal movement of the moving mold 15 wraps around the fixed mold 14 until the second mold cavity 31 inside the moving mold 15 and the first mold cavity 21 inside the fixed mold 14 are completely engaged to form a sealed chamber. Subsequently, the moving mold 15 stops its horizontal movement. The fixed mold 14 and the positioning plate 18 are connected by a spring rod 22. A perfusion tube 24 is embedded inside the fixed mold 14. A through hole is formed on the surface of the perfusion tube 24. The perfusion tube 24 penetrates through the outer wall of the fixed mold 14 and extends into the interior of the fixed mold 14. The perfusion tube 24 is rotatably connected to the fixed mold 14. The perfusion tube 24 is connected to an extrusion tube 19. The interior of the fixed mold 14 is provided with a first mold cavity 21. The first mold cavity 21 is arranged in a ring structure. The inner ring wall of the first mold cavity 21 is made of silica gel. Perfusion ports 23 are formed on the inner walls of both the first mold cavity 21 and the second mold cavity 31. When the through hole on the perfusion tube 24 corresponds to the perfusion port 23, the perfusion tube 24, the perfusion port 23 and the interior of the first mold cavity 21 are connected and communicated. The molten injection molding raw material is transported through the positioning plate 18 into the interior of the perfusion tube 24 and finally fills the interiors of the first mold cavity 21 and the second mold cavity 31. A lining groove 26 is formed inside the fixed mold 14. A discharge tube 25 is also embedded inside the fixed mold 14. The discharge tube 25 penetrates through the interior of the fixed mold 14 and its bottom end is in contact with the surface of the perfusion tube 24. The discharge tube 25 is adapted to the through hole formed on the perfusion tube 24;

[0033] In the injection molding stage, first, the fixed mold 14 and the moving mold 15 need to be overlapped. After overlapping, the first mold cavity 21 and the second mold cavity 31 inside the fixed mold 14 and the moving mold 15 are completely attached together, forming a sealed space. In this way, the raw material is extruded into the interiors of the first mold cavity 21 and the second mold cavity 31 for molding. Additionally, during mass production, multiple first mold cavities 21 and second mold cavities 31 are arranged inside the fixed mold 14 and the moving mold 15. Among them, the first mold cavity 21 and the second mold cavity 31 are connected through the perfusion port 23. In this way, during injection molding, the raw material can be injected into each first mold cavity 21 and second mold cavity 31 through the perfusion port 23, thus achieving mass production.

[0034] When the fixed mold 14 and the movable mold 15 are aligned, first, the hydraulic push rod 16 starts to work. After the hydraulic push rod 16 works, it pushes the movable mold 15. As the movable mold 15 moves, the movable mold 15 wraps around the outer wall of the fixed mold 14 to ensure the seal between the two. When the fixed mold 14 and the movable mold 15 are fully fitted, as the movable mold 15 moves, it will push the fixed mold 14 to move. At this time, the fixed mold 14 will be pushed to move towards the positioning plate 18. During this period, the spring rod 22 is compressed. When the back side of the fixed mold 14 is fully fitted to the positioning plate 18, the hydraulic push rod 16 stops pushing. At this time, the first mold cavity 21 and the second mold cavity 31 are also fully fitted together, and the support block 29 will gradually embed into the inner part of the lining groove 26 during the pushing process. At this time, the preparatory work before injection molding is completed.

[0035] To improve the quality of the injection molding of the sealing ring, the raw material is transported into the fixed mold 14 through the perfusion pipe 24. At the beginning of the transportation, the through hole on the perfusion pipe 24 and the perfusion port 23 are misaligned. That is to say, the raw material inside the perfusion pipe 24 cannot enter the perfusion port 23 through the through hole. The first thing that contacts the through hole is the discharge pipe 25. When the through hole on the perfusion pipe 24 coincides with the discharge pipe 25, the raw material at the starting section will be squeezed into the discharge pipe 25. At this time, because the raw material at the starting section contains a large amount of air, if it is directly injected into the first mold cavity 21, it will cause a large number of air voids in the formed sealing ring. To eliminate the air in the raw material at the starting section of the raw material, part of the raw material and the air accompanying the raw material are discharged through the discharge pipe 25. During this process, with the extrusion, the air between the raw materials can be eliminated. When the raw material is stably output and there is no air inside, then rotate the perfusion pipe 24 to align the perfusion pipe 24 with the perfusion port 23. After alignment, the raw material inside the perfusion pipe 24 will enter the perfusion port 23 through the through hole, and then be transported to the first mold cavity 21 through the perfusion port 23. Finally, the raw material completely fills the inside of the first mold cavity 21 and the second mold cavity 31, completing the injection molding. After cooling for a period of time, through the separation between the fixed mold 14 and the movable mold 15, the sealing ring located inside the first mold cavity 21 and the second mold cavity 31 is separated from it and then falls into the cooling water tank 17, and the formed sealing ring is cooled by the cooling water tank 17.

[0036] A traction block 28 is embedded inside the lining groove 26. One end of the extension belt 27 is connected to the traction block 28. One end of the traction block 28 away from the extension belt 27 is connected to a positioning plate 18. The extension belt 27 is arranged in a U shape and is divided into a fixed part, a bent part and a flexible part. The flexible part of the extension belt 27 is fixedly connected to one side of the inner wall of the lining groove 26 close to the center of the circle. The end of the flexible part is connected to the bent part. One side of the bent part away from the flexible part is connected to the fixed part. The fixed part is arranged on the outer side of the inner wall of the lining groove 26. A water injection pipe 30 is embedded inside the discharge pipe 25. A second mold cavity 31 is formed inside the moving mold 15. A water injection pipe 30 is embedded inside the moving mold 15. One end of the water injection pipe 30 is connected to a support block 29. The support block 29 is embedded inside the lining groove 26. The extension belt 27 wraps around the support block 29, and the support block 29 corresponds to the lining groove 26.

[0037] During the demolding process, in order to facilitate taking out the injection-molded sealing ring from the first mold cavity 21 and the second mold cavity 31, if the ejection method is directly adopted, due to the small contact area and large local pressure, the sealing ring will be damaged. To solve this problem, during demolding, first, coolant is conveyed into the support block 29 through the water injection pipe 30. The coolant circulates inside the water injection pipe 30. After circulating for a period of time, the temperature of the surfaces of the fixed mold 14 and the moving mold 15 is carried away by the coolant. In this way, the temperature of the first mold cavity 21 and the second mold cavity 31 can also be better dissipated. After cooling, the fixed mold 14 and the moving mold 15 are separated. At the beginning of the separation, when the moving mold 15 moves, the fixed mold 14 also follows. This is because when the spring rod 22 loses the acting force of the moving mold 15, it starts to expand. When it expands, the fixed mold 14 disengages from the surface of the positioning plate 18. To avoid the too-fast separation speed between the positioning plate 18 and the fixed mold 14, a damping ring is arranged inside the spring rod 22. When the spring expands, it needs to push the damping ring to move, so the expansion process of the spring becomes slow. When the fixed mold 14 and the moving mold 15 are separated, the lining groove 26 and the support block 29 are also separated. During this process, the first mold cavity 21 and the second mold cavity 31 are also separated. As the spring rod 22 continues to expand, the distance between the fixed mold 14 and the positioning plate 18 continuously increases. At this time, the traction block 28 on the positioning plate 18 will traction the extension belt 27. When the extension belt 27 is tractioned, the inner wall of the lining groove 26 is pulled by the extension belt 27, thereby causing the first mold cavity 21 to deform. When the first mold cavity 21 deforms backward, the rubber ring embedded inside the first mold cavity 21 will disengage from the first mold cavity 21. By pulling the first mold cavity 21 to one side, the first mold cavity 21 is deformed, driving the first mold cavity 21 to actively separate from the rubber ring. In this way, the rubber ring can be prevented from being damaged by force.

[0038] In addition, during the deformation process of the first cavity 21, the inner ring of the first cavity 21 is pulled by the flexible part on the extension belt 27, causing the inner ring of the first cavity 21 to be recessed inward. During this process, the sealing ring will be peeled off from the inner ring of the first cavity 21, and it is in a gradually peeling process, which can also reduce the impact on the sealing ring.

[0039] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0040] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A batch injection molding device for processing sealing rings, comprising an operation platform (11), characterized in that: The top surface of the operation platform (11) is connected with an injection extrusion machine (12). The top surface of the injection extrusion machine (12) is equipped with a feed hopper (13). The top surface of the operation platform (11) is also connected with a positioning plate (18). An extrusion pipe (19) is embedded in the injection extrusion machine (12). One side of the positioning plate (18) is connected with a demoulding assembly (2). The demoulding assembly (2) includes a spring rod (22). The spring rod (22) is fixedly connected to the positioning plate (18). The end of the spring rod (22) away from the positioning plate (18) is connected with a fixed mould (14). The fixed mould (14) and the positioning plate (18) are connected by the spring rod (22). A perfusion pipe (24) is embedded in the fixed mould (14). The perfusion pipe (24) is connected with the extrusion pipe (19). A first mould cavity (21) is formed inside the fixed mould (14). A perfusion port (23) is arranged on the inner wall of the first mould cavity (21). A lining groove (26) is formed inside the fixed mould (14). A discharge pipe (25) is also embedded in the fixed mould (14). A traction block (28) is embedded in the lining groove (26). The end of the traction block (28) is connected with an extension belt (27). The end of the traction block (28) away from the extension belt (27) is connected with the positioning plate (18). A water injection pipe (30) is embedded in the discharge pipe (25). A hydraulic push rod (16) is also installed at the top of the operation platform (11). The output end of the hydraulic push rod (16) is connected with a moving mould (15). A second mould cavity (31) is formed inside the moving mould (15). A water injection pipe (30) is embedded in the moving mould (15). One end of the water injection pipe (30) is connected with a support block (29). The support block (29) corresponds to the lining groove (26).

2. The mass injection molding device for processing sealing rings according to claim 1, characterized in that: A cooling water tank (17) is embedded in the operation platform (11). The cooling water tank (17) is arranged directly below the fixed mould (14) and the moving mould (15). The cooling water tank (17) is used to cool the demoulded sealing ring.

3. The mass injection molding device for processing sealing rings according to claim 1, characterized in that: The hydraulic push rod (16) is used to control the horizontal movement of the moving mould (15).

4. A batch injection molding device for processing sealing rings according to claim 3, characterized in that: The horizontal movement of the moving mould (15) wraps around the fixed mould (14) until the second mould cavity (31) inside the moving mould (15) and the first mould cavity (21) inside the fixed mould (14) are completely engaged to form a sealed chamber. Then, the moving mould (15) stops its horizontal movement.

5. A mass injection molding device for processing sealing rings according to claim 1, characterized in that: A through hole is formed on the surface of the perfusion pipe (24). The perfusion pipe (24) penetrates through the outer wall of the fixed mould (14) and extends into the fixed mould (14). The perfusion pipe (24) is rotatably connected with the fixed mould (14).

6. The mass injection molding device for processing sealing rings according to claim 5, wherein: When the through hole on the perfusion pipe (24) corresponds to the perfusion port (23), the perfusion pipe (24), the perfusion port (23) and the inside of the first mould cavity (21) are connected. The molten injection raw material is transported to the inside of the perfusion pipe (24) through the positioning plate (18) and finally fills the inside of the first mould cavity (21) and the second mould cavity (31).

7. A mass injection molding device for processing sealing rings according to claim 1, characterized in that: The discharge pipe (25) penetrates through the inside of the fixed mold (14), and the bottom end thereof is attached to the surface of the perfusion pipe (24). The through holes formed in the discharge pipe (25) and the perfusion pipe (24) are adapted to each other.

8. A batch injection molding device for processing sealing rings according to claim 1, characterized in that: The first mold cavity (21) is arranged in a ring structure. The inner ring wall of the first mold cavity (21) is made of silica gel. Perfusion ports (23) are formed in the inner walls of both the first mold cavity (21) and the second mold cavity (31).

9. The mass injection molding device for processing sealing rings according to claim 1, characterized in that: The extension belt (27) is arranged in a U shape and is divided into a fixing part, a bending part and a flexible part. The flexible part of the extension belt (27) is fixedly connected to one side of the inner wall of the lining groove (26) close to the center of the circle. The end of the flexible part is connected to a bending part, and the side of the bending part away from the flexible part is connected to a fixing part. The fixing part is arranged on the outer side of the inner wall of the lining groove (26).

10. The mass injection molding device for processing sealing rings according to claim 9, wherein: The support block (29) is embedded into the inside of the lining groove (26), and the extension belt (27) is wrapped around the support block (29).

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