Batch injection molding device for sealing ring machining

Abstract

The invention discloses a batch injection molding device for sealing ring processing, relates to the technical field of sealing ring injection molding, and aims to solve the problems that sealing rings cannot be separated from mold cavities when a mold is opened due to large contact area and friction force between the mold cavities of the sealing rings, and a traditional demolding mode mainly depends on an ejection mechanism of the mold, so that the sealing rings cannot be separated from the mold cavities when the mold is opened. However, the wall of the sealing ring is thin, the ejection acting force of an ejection structure can cause deformation and even breakage of the sealing ring, and the service life and the production stability of the mold are influenced. A damping ring of a spring rod is used for controlling the separation speed of a fixed mold and a positioning plate, and a first mold cavity is deformed through a traction block and an extension belt and is actively separated from a rubber ring; the situation that the rubber ring is damaged due to uneven stress or overlarge local pressure during demolding is reduced, especially for the sealing ring at the inner ring of the first mold cavity, gradual stripping can be achieved, the influence on a product is reduced to the maximum degree, and the quality and efficiency of machining and injection molding of the sealing ring are overall improved.

Description

Technical Field

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

[0002] Injection molding is one of the main process methods for manufacturing sealing rings. The process is to heat and melt the plastic raw materials in the injection molding machine until they are molten, and then inject the molten material into the pre-designed mold cavity under a certain pressure. After cooling and solidification, 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 shooting platform assembly, a plasticizing assembly and a screw assembly, wherein the plasticizing assembly and the screw assembly are connected, the screw assembly runs through the shooting platform assembly, and the shooting platform assembly is provided with openings on both sides along the first direction, and the screw assembly drives the plasticizing assembly to perform a glue injection action on the shooting platform assembly. An injection molding machine is also provided, including the injection molding device as described above. The invention provides an injection molding device and an injection molding machine, which change the installation direction of the plasticizing seat assembly, so that the shooting platform assembly is not easily deformed when subjected to force, and is easy to process. The injection guide rail is installed on the side wall of the bottom plate, and the slider moves in a direction perpendicular to the injection direction when the shooting platform assembly is subjected to force, and the guide rail and the slider are not easily damaged. Changing the installation position of the plasticizing assembly is easy to install and maintain.

[0004] Due to the large contact area and friction between the sealing ring and the mold cavity, the sealing ring cannot be separated from the mold cavity when the mold is opened. The traditional demolding method mainly relies on the ejection mechanism of the mold. However, the wall of the sealing ring is 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 demoulding in the background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a batch injection molding device for processing sealing rings, comprising an operating platform, the top surface of the operating platform is connected to an injection molding extruder, the top surface of the injection molding extruder is installed with a feed hopper, the top surface of the operating platform is also connected to a positioning plate, an extrusion tube is embedded in the injection molding extruder, one side of the positioning plate is connected to a demoulding component, the demoulding component comprises a spring rod, the spring rod 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, an injection tube is embedded in the fixed mold, the injection tube is connected to the extrusion tube, a first mold cavity is opened in the fixed mold, an injection port is opened on the inner wall of the first mold cavity, a lining groove is opened in the fixed mold, and a drain pipe is also embedded in the fixed mold;

[0008] A traction block is embedded in the lining groove, the end of the extension belt is connected to the traction block, the end of the traction block away from the extension belt is connected to a positioning plate, a water injection pipe is embedded in the drain pipe, a second mold cavity is opened in the movable mold, a water injection pipe is embedded in the movable 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 in the interior of the operating platform, and the cooling water tank is arranged directly below the fixed mold and the movable mold, and the cooling water tank is used to cool the sealing ring after demoulding.

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

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

[0012] Preferably, a through hole is opened on the surface of the perfusion tube, the perfusion tube penetrates the outer wall of the fixed mold until it extends to the inside of the fixed mold, and the perfusion tube and the fixed mold are rotatably connected.

[0013] Preferably, when the through hole on the perfusion tube corresponds to the perfusion port, the perfusion tube, the perfusion port and the interior of the first mold cavity are connected, and the molten injection material is transported to the interior of the perfusion tube through the positioning plate to finally fill the interior of the first mold cavity and the second mold cavity.

[0014] Preferably, the drainage tube passes through the interior of the fixed mold, and the bottom end is attached to the surface of the perfusion tube, and the through holes opened on the drainage tube and the perfusion tube are matched.

[0015] Preferably, the first mold cavity is configured as an annular structure, the inner annular wall of the first mold cavity is made of silicone, and injection ports are provided on the inner walls of the first mold cavity and the second mold cavity.

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

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

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention provides a batch injection molding device for processing sealing rings. The problem of hollow sealing rings caused by air in the starting section of the raw material is effectively solved through an infusion pipe and a discharge pipe, thereby improving 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 is deformed through a traction block and an extension belt to actively separate from the rubber ring, thereby reducing the situation where the rubber ring is damaged due to uneven force or excessive local pressure during demolding. In particular, for the sealing ring at the inner ring of the first mold cavity, gradual peeling can be achieved to minimize the impact on the product, thereby improving the quality and efficiency of the sealing ring processing injection molding as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

[0025] Figure 6 It is a schematic diagram of the structure of the present invention when the movable mold and the fixed mold are separated;

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

[0027] Figure 8It is a schematic diagram of the explosion structure of the fixed mold and the movable mold of the structure of the present invention.

[0028] In the figure: 11, operating platform; 12, injection molding extruder; 13, feed hopper; 14, fixed mold; 15, movable mold; 16, hydraulic push rod; 17, cooling water trough; 18, positioning plate; 19, extrusion tube; 2, demoulding assembly; 21, first mold cavity; 22, spring rod; 23, injection port; 24, injection tube; 25, drain pipe; 26, lining groove; 27, extension belt; 28, traction block; 29, support block; 30, water injection pipe; 31, second mold cavity. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0031] Combination Figure 1-Figure 8 The present invention discloses a batch injection molding device for processing a sealing ring, comprising an operating platform 11, the top surface of the operating platform 11 is connected to an injection molding extruder 12, the top surface of the injection molding extruder 12 is installed with a feed hopper 13, the top surface of the operating platform 11 is also connected to a positioning plate 18, and an extrusion tube 19 is embedded in the injection molding extruder 12. In the sealing ring processing link, the masterbatch is put into the feed hopper 13, and the masterbatch is heated by the injection molding extruder 12 to form a molten state, and then the raw material is transported to the inside of the extrusion tube 19 by the injection molding extruder 12, and then poured into the inside of the fixed mold 14, so as to realize the processing and molding of the rubber ring;

[0032] One side of the positioning plate 18 is connected to a demoulding assembly 2, and the demoulding assembly 2 includes a spring rod 22, which is fixedly connected to the positioning plate 18, and one end of the spring rod 22 away from the positioning plate 18 is connected to the fixed mold 14. A cooling water tank 17 is embedded in the operating platform 11, and the cooling water tank 17 is arranged directly below the fixed mold 14 and the movable mold 15. The cooling water tank 17 is used to cool the sealing ring after demoulding. A hydraulic push rod 16 is also installed on the top of the operating platform 11, and the output of the hydraulic push rod 16 The movable mold 15 is connected to the end thereof, and the hydraulic push rod 16 is used to control the horizontal movement of the movable mold 15. The horizontal movement of the movable mold 15 is wrapped around the fixed mold 14 until the second mold cavity 31 inside the movable mold 15 and the first mold cavity 21 inside the fixed mold 14 are fully engaged to form a sealed chamber, and then the movable mold 15 stops moving in the horizontal direction. The fixed mold 14 and the positioning plate 18 are connected by a spring rod 22. A perfusion pipe 24 is embedded in the fixed mold 14, and a through hole is opened on the surface of the perfusion pipe 24. The perfusion pipe 24 is filled with a through hole. The injection tube 24 penetrates the outer wall of the fixed mold 14 until it extends to the inside of the fixed mold 14. The injection tube 24 and the fixed mold 14 are rotatably connected. The injection tube 24 is connected to the extrusion tube 19. A first mold cavity 21 is opened inside the fixed mold 14. The first mold cavity 21 is set to an annular structure. The inner ring wall of the first mold cavity 21 is made of silicone. The first mold cavity 21 and the inner wall of the second mold cavity 31 are both provided with a injection port 23. The inner wall of the first mold cavity 21 is provided with a injection port 23. The through hole on the injection tube 24 and the injection port 23, the infusion pipe 24, the infusion port 23 and the interior of the first mold cavity 21 are connected, and the molten injection material is transported to the interior of the infusion pipe 24 through the positioning plate 18 to finally fill the interior of the first mold cavity 21 and the second mold cavity 31. A lining groove 26 is provided inside the fixed mold 14, and a drainage pipe 25 is also embedded in the fixed mold 14. The drainage pipe 25 runs through the interior of the fixed mold 14, and the bottom end is attached to the surface of the infusion pipe 24, and the drainage pipe 25 is matched with the through hole provided on the infusion pipe 24;

[0033] During the injection molding stage, the fixed mold 14 and the movable mold 15 need to be overlapped first. After the overlap, the first mold cavity 21 and the second mold cavity 31 inside the fixed mold 14 and the movable mold 15 are completely fitted together to form a closed space, so that the raw material is squeezed into the first mold cavity 21 and the second mold cavity 31 to be formed. In addition, during batch production, a plurality of first mold cavities 21 and second mold cavities 31 are arranged inside the fixed mold 14 and the movable mold 15, wherein the first mold cavity 21 and the second mold cavity 31 are connected through the injection port 23, so that during injection molding, the raw material can be injected into each of the first mold cavity 21 and the second mold cavity 31 through the injection port 23, thus realizing batch production.

[0034] When the fixed mold 14 and the movable mold 15 are overlapped, the hydraulic push rod 16 starts to work first. When the hydraulic push rod 16 works, it pushes the movable mold 15. As the movable mold 15 moves, the movable mold 15 is wrapped 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 completely fitted, the fixed mold 14 is pushed to move as the movable mold 15 moves. At this time, the fixed mold 14 is pushed to move toward the side of the positioning plate 18. During this period, the spring rod 22 is compressed. When the back side of the fixed mold 14 is completely 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 completely fitted together, and the support block 29 will gradually embed into the interior of the lining groove 26 during the pushing process; at this time, the preparation work before injection molding is completed;

[0035] In order to improve the quality of injection molding of the sealing ring, the raw material is transported to the inside of the fixed mold 14 through the perfusion tube 24. At the beginning of the transportation, the through hole on the perfusion tube 24 and the perfusion port 23 are staggered, that is, the raw material inside the perfusion tube 24 cannot enter the inside of the perfusion port 23 through the through hole. The first thing to contact with the through hole is the discharge tube 25. When the through hole on the perfusion tube 24 and the discharge tube 25 coincide with each other, the raw material of the starting section will be squeezed into the inside of the discharge tube 25. At this time, because the raw material of the starting section contains a lot of air, if it is directly injected into the inside of the first mold cavity 21, it will cause a lot of hollows inside the molded sealing ring. In order to eliminate the air in the raw material in the starting section of the raw material, part of the raw material and the air in the raw material are discharged through the discharge tube 25. The accompanying air is squeezed during this process, so that the air between the raw materials can be eliminated. When the raw materials are output stably and there is no air inside, the filling tube 24 is rotated to align the filling tube 24 and the filling port 23. After alignment, the raw material inside the filling tube 24 will enter the filling port 23 through the through hole, and then be transported to the first mold cavity 21 by the filling port 23. Finally, the raw material completely fills the first mold cavity 21 and the second mold cavity 31, and the injection molding is completed. After cooling for a period of time, the sealing rings located inside the first mold cavity 21 and the second mold cavity 31 are separated from them through the separation between the fixed mold 14 and the movable mold 15, and then fall into the cooling water tank 17, and the molded sealing rings are cooled by the cooling water tank 17.

[0036] A traction block 28 is embedded in the lining groove 26, and the end of the extension belt 27 is connected to the traction block 28. The end of the traction block 28 away from the extension belt 27 is connected to the positioning plate 18. The extension belt 27 is set in a U shape. The extension belt 27 is divided into a fixed part, a curved part and a flexible part. The flexible part of the extension belt 27 is fixedly connected to the 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 curved part, and the side of the curved 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 in the drain pipe 25, and a second mold cavity 31 is opened in the movable mold 15. A water injection pipe 30 is embedded in the movable mold 15, and one end of the water injection pipe 30 is connected to a support block 29. The support block 29 is embedded in the lining groove 26, and the extension belt 27 is wrapped on the support block 29. The support block 29 corresponds to the lining groove 26.

[0037] During the demolding process, in order to facilitate the removal of the injection molded sealing ring from the first mold cavity 21 and the second mold cavity 31, if the ejection method is directly adopted, the sealing ring will be damaged due to the small contact area and the large local pressure. In order to solve this problem, during the demolding, first, the coolant is transported to the inside of the support block 29 through the water injection pipe 30, and the coolant circulates inside the water injection pipe 30. After circulating for a period of time, the temperature of the surface of the fixed mold 14 and the movable mold 15 is taken away by the coolant, so that 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 movable mold 15 are separated. At the beginning of the separation, the movable mold 15 moves and the fixed mold 14 also moves. This is because the spring rod 22 begins to expand when the force of the movable mold 15 is lost. When expanding, the fixed mold 14 also separates from the surface of the positioning plate 18. In order to avoid the positioning plate 18 and the fixed mold 14 from separating too quickly, a spring rod 22 is set inside The damping ring and the spring extension need to push the damping ring to move, so that the expansion process of the spring becomes slow. When the fixed mold 14 and the movable mold 15 are separated, the lining groove 26 and the support block 29 are also separated. In this process, the first mold cavity 21 and the second mold cavity 31 are also separated. As the spring rod 22 continues to extend, the distance between the fixed mold 14 and the positioning plate 18 continues to increase. At this time, the traction block 28 on the positioning plate 18 will pull the extension belt 27. When the extension belt 27 is pulled, the extension belt 27 pulls the inner wall of the lining groove 26, thereby causing the first mold cavity 21 to deform. When the first mold cavity 21 is deformed to the rear side, the rubber ring embedded in the first mold cavity 21 will be separated 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 of the first mold cavity 21, the inner ring of the first mold cavity 21 is pulled by the flexible portion on the extension band 27, causing the inner ring of the first mold cavity 21 to recess inward. During this process, the sealing ring will be peeled off from the inner ring of the first mold cavity 21, and is in a gradual 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, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the 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 operating platform (11), characterized in that: The top surface of the operating platform (11) is connected to an injection molding extruder (12), a feed hopper (13) is installed on the top surface of the injection molding extruder (12), and the top surface of the operating platform (11) is also connected to a positioning plate (18), an extrusion tube (19) is embedded in the injection molding extruder (12), and one side of the positioning plate (18) is connected to a demoulding component (2), and the demoulding component (2) includes a spring rod (22), and the spring rod (22) is fixedly connected to the positioning plate (18), and the spring rod (22) is away from the positioning plate. One end of the fixed mold (18) is connected to a fixed mold (14), the fixed mold (14) and the positioning plate (18) are connected via a spring rod (22), a filling pipe (24) is embedded in the fixed mold (14), the filling pipe (24) is connected to the extrusion pipe (19), a first mold cavity (21) is provided in the fixed mold (14), a filling port (23) is provided on the inner wall of the first mold cavity (21), a lining groove (26) is provided in the fixed mold (14), and a discharge pipe (25) is also embedded in the fixed mold (14); A traction block (28) is embedded in the lining groove (26), the end of the traction block (28) is connected to an extension belt (27), the end of the traction block (28) away from the extension belt (27) is connected to a positioning plate (18), a water injection pipe (30) is embedded in the drain pipe (25), a hydraulic push rod (16) is also installed on the top of the operating platform (11), the output end of the hydraulic push rod (16) is connected to a movable mold (15), a second mold cavity (31) is opened in the movable mold (15), a water injection pipe (30) is embedded in the movable mold (15), one end of the water injection pipe (30) is connected to a support block (29), and the support block (29) corresponds to the lining groove (26).

2. The batch injection molding device for sealing ring processing according to claim 1 is characterized in that: A cooling water trough (17) is embedded inside the operating platform (11). The cooling water trough (17) is arranged directly below the fixed mold (14) and the movable mold (15). The cooling water trough (17) is used to cool the sealing ring after demoulding.

3. The batch injection molding device for sealing ring processing according to claim 1 is characterized in that: The hydraulic push rod (16) is used to control the horizontal movement of the movable mold (15).

4. The batch injection molding device for sealing ring processing according to claim 3 is characterized in that: The movable mold (15) moves horizontally and wraps around the fixed mold (14) until the second mold cavity (31) inside the movable mold (15) and the first mold cavity (21) inside the fixed mold (14) are fully engaged to form a sealed chamber, and then the movable mold (15) stops moving horizontally.

5. The batch injection molding device for sealing ring processing according to claim 1 is characterized in that: A through hole is provided on the surface of the perfusion pipe (24), and the perfusion pipe (24) penetrates the outer wall of the fixed mold (14) until it extends to the inside of the fixed mold (14), and the perfusion pipe (24) and the fixed mold (14) are rotatably connected.

6. The batch injection molding device for processing sealing rings according to claim 5, characterized in that: When the through hole on the injection pipe (24) corresponds to the injection port (23), the injection pipe (24), the injection port (23) and the interior of the first mold cavity (21) are connected, and the injection material in a molten state is transported to the interior of the injection pipe (24) through the positioning plate (18) and finally fills the interior of the first mold cavity (21) and the second mold cavity (31).

7. The batch injection molding device for sealing ring processing according to claim 1 is characterized in that: The drainage pipe (25) passes through the interior of the fixed mold (14), and the bottom end is attached to the surface of the perfusion pipe (24). The through holes opened on the drainage pipe (25) and the perfusion pipe (24) are matched.

8. The batch injection molding device for sealing ring processing according to claim 1 is characterized in that: The first mold cavity (21) is configured as an annular structure, the inner annular wall of the first mold cavity (21) is made of silicone rubber, and the inner walls of the first mold cavity (21) and the second mold cavity (31) are both provided with injection ports (23).

9. The batch 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 fixed portion, a curved portion and a flexible portion. The flexible portion of the extension belt (27) is fixedly connected to a side of the inner wall of the lining groove (26) close to the center of the circle, the end of the flexible portion is connected to the curved portion, and the side of the curved portion away from the flexible portion is connected to the fixed portion. The fixed portion is arranged on the outer side of the inner wall of the lining groove (26).

10. The batch injection molding device for processing sealing rings according to claim 9, characterized in that: The support block (29) is embedded in the lining groove (26), and the extension belt (27) is wrapped around the support block (29).

Images