Processing method and equipment for polytetrafluoroethylene sealing ring

Abstract

The invention discloses a polytetrafluoroethylene sealing ring processing method and equipment, and relates to the technical field of polytetrafluoroethylene sealing ring processing.The polytetrafluoroethylene sealing ring processing method comprises the following steps that raw materials are put in, a worker opens a cover plate, polytetrafluoroethylene materials are put into a mixing bin through a raw material inlet, and the raw materials are uniformly mixed; then adding a proper amount of a modifier, an antioxidant and a lubricant into the mixing bin through a raw material inlet according to needs; through cooperative work of all the devices and assemblies, comprehensive quality control and optimization in the machining process of the polytetrafluoroethylene sealing ring are achieved, and high quality and stability of products are ensured from precise feeding, mixing and drying of raw materials to melting, conveying and neutralizing of the materials to final pressing forming and cooling polishing. Due to the introduction of the ultrasonic generator, a guarantee is added for the processing process, even if a small amount of materials are caked or agglomerated, the materials can be broken in time, and the processing quality and efficiency are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of polytetrafluoroethylene sealing ring processing, in particular to a polytetrafluoroethylene sealing ring processing method and equipment. Background Art

[0002] As a high-performance sealing material, polytetrafluoroethylene (PTFE) seals are widely used in industrial production. However, traditional PTFE seal processing suffers from low efficiency, low molding precision, insufficient wear resistance, and static electricity generation during processing, making it difficult to meet the demand for high-quality seals in modern industry.

[0003] In the processing of polytetrafluoroethylene sealing rings, the problem of static electricity has always been a challenge that cannot be ignored. Due to the extremely high insulation performance of PTFE material, it is very easy to generate static electricity when it contacts or rubs with other materials. If this static electricity is not handled in time, it will cause the material to agglomerate and re-agglomerate, thereby affecting the processing efficiency and product quality. Especially in the process of conveying molten materials, the static electricity problem is particularly prominent because the material is in a high temperature and high viscosity state at this time. Once agglomerates or agglomerates are formed, it will be difficult to disperse and re-melt. In severe cases, it will directly lead to processing failure. Traditional treatment methods mostly use physical patting, chemical additives and other methods to reduce the generation of static electricity, but these methods often have disadvantages such as low efficiency, high cost, and affect material performance. For example, although physical patting can temporarily eliminate static electricity on the surface of the material, it cannot fundamentally solve the problem and is prone to introduce impurities. Although chemical additives can reduce the generation of static electricity in the material, they often have adverse effects on the chemical and physical properties of the material, reducing the overall quality of the product. Therefore, based on the above search and in combination with the existing technology, a polytetrafluoroethylene sealing ring processing method and equipment are proposed to solve the above problems. Summary of the Invention

[0004] The object of the present invention is to provide a polytetrafluoroethylene sealing ring processing method and equipment to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: The polytetrafluoroethylene sealing ring processing method comprises the following steps: A1: Put the raw materials in. The staff will open the cover and put the polytetrafluoroethylene material into the mixing chamber through the raw material inlet. Then, the modifier, antioxidant and lubricant will be added into the mixing chamber through the raw material inlet. A2: Mixing and drying: Turn on the drive motor to rotate the output shaft of the drive motor and drive the stirring blade 1 to rotate. The stirring blade 1 stirs the polytetrafluoroethylene material and the additive inside the mixing chamber. The resistance heating ring dries the polytetrafluoroethylene material to ensure that it is free of moisture. A3: Melting and conveying: Open the discharge valve to allow the mixed PTFE material in the mixing chamber to flow into the smelting chamber through the discharge pipe for melting, heating the PTFE material to a molten state. The molten PTFE material is then injected into the lower mold through the through hole, pneumatic diaphragm pump, inlet pipe, and outlet pipe in sequence; A4: Neutralization: During the transportation process, the static electricity generated by the contact or friction between the polytetrafluoroethylene material and the mold and the transportation pipeline is neutralized through the diversion chamber, ion air gun, diversion pipe 1, diversion pipe 2 and diversion pipe 3; A5: Compression molding: The upper mold is lowered by a hydraulic cylinder to cooperate with the lower mold. Under a certain temperature and pressure, the molten polytetrafluoroethylene material in the lower mold is pressed to form a sealing ring; A6: Cool the mold. After the temperature of the lower mold and the upper mold drops to 150-250°C, open the mold, remove the sealing ring, and then polish the parting line of the sealing ring.

[0006] Furthermore, in step A5, the certain temperature and pressure are: the temperature of hot pressing molding is 382-388° C., the pressure is 9-13 MPa, and the time is 2.5-3 hours.

[0007] Furthermore, a polytetrafluoroethylene sealing ring processing equipment for implementing the method includes: The bracket comprises a workbench fixedly mounted on the top surface of the bracket, a plurality of support blocks fixedly mounted on the top surface of the workbench, a mixing bin fixedly mounted on the top surfaces of the plurality of support blocks, a plurality of observation windows provided on the outer surface of the mixing bin, a raw material inlet provided on the top surface of the mixing bin, a cover plate slidably mounted on the inner wall of the raw material inlet, a stirring blade 1 rotatably connected to the inner wall of the mixing bin, a driving motor fixedly mounted on the left side wall of the mixing bin, an output shaft of the driving motor being connected to the left side wall of the stirring blade 1, a plurality of resistance heating rings provided on the inner wall of the mixing bin, and a discharge valve provided on the bottom surface of the mixing bin.

[0008] Furthermore, the processing equipment also includes: a melting machine, which is fixedly mounted on the right side wall of the workbench, a smelting bin is fixedly mounted on the inner wall of the melting machine, a second stirring blade is rotatably connected to the interior of the smelting bin, a servo motor is fixedly mounted on the bottom surface of the smelting bin, an output shaft of the servo motor is connected to the bottom surface of the second stirring blade, a plurality of heating elements are fixedly mounted on the top surface of the smelting bin, a temperature sensor is fixedly mounted on the side wall of the melting machine located above the smelting bin, and the processing equipment also includes a conveying component, a neutralization component and a pressing component.

[0009] Furthermore, the conveying assembly includes: a discharge pipe, one end of the discharge pipe is connected to the bottom surface of the discharge valve, and the other end passes through the top surface of the melting machine and extends to the top of the smelting bin, a through hole is opened inside the smelting bin, an electric push rod 1 is fixedly installed on the bottom surface of the smelting bin, and a sealing plate is fixedly installed on the output end of the electric push rod 1, an inclined block is fixedly installed inside the melting machine, and the inclined block is located below the through hole, an air-operated diaphragm pump is fixedly installed inside the melting machine, an inlet pipe is provided on one side of the air-operated diaphragm pump, and an outflow pipe is provided on the other side, an electric push rod 2 is fixedly installed on the side wall of the melting machine, and a connecting ring is fixedly installed on the output shaft of the electric push rod 2, the bottom surface of the connecting ring is connected to the end of the outflow pipe, and an ultrasonic generator is fixedly installed on the side wall of the connecting ring.

[0010] Furthermore, the neutralization component includes: a diversion bin, which is fixedly installed inside the melting machine, an ion air gun is fixedly installed on the bottom surface of the diversion bin, and the air outlet of the ion air gun is located in the diversion bin, and two diversion tubes 1 are fixedly installed on the top surface of the ion air gun, and the two diversion tubes 1 connect the diversion bin with the top surface of the inclined block, and the side walls of the diversion bin are respectively provided with diversion tube 2 and diversion tube 3, and the diversion tube 2 connects the diversion bin with the top of the smelting bin, and the diversion tube 3 connects the diversion bin with the discharge pipe.

[0011] Furthermore, the pressing assembly includes: a base, which is arranged on one side of the melting machine, and sliding rods are fixedly installed at the four corners of the top surface of the base, a lower mold is provided on the top surface of the base, and an upper mold is slidably connected to the sliding rod, a top plate is fixedly installed on the top surface of the sliding rod, and a hydraulic cylinder is fixedly installed on the bottom surface of the top plate, and the output end of the hydraulic cylinder is connected to the top surface of the upper mold.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention effectively solves the static electricity problem caused by contact or friction between polytetrafluoroethylene materials and other materials during processing by providing a neutralization component. The ion wind gun in the neutralization component works continuously in the diversion chamber, and accurately injects ion wind above the inclined block, the smelting chamber and the discharge pipe through the diversion pipe, comprehensively covering all aspects of material transportation and processing, effectively neutralizing static electricity, avoiding material agglomeration or agglomeration caused by static electricity, and significantly improving processing efficiency and product quality. 2. In the present invention, by providing a conveying assembly, not only the precise conveying of the molten material is achieved, but also the design of the electric push rod and the connecting ring ensures the precise positioning of the end of the outflow pipe, so that the molten material can be accurately injected into the lower mold, avoiding material waste and processing errors; 3. In the present invention, through the coordinated work of the mixing chamber, melting machine, conveying assembly, neutralization assembly and pressing assembly, comprehensive quality control and optimization of the polytetrafluoroethylene sealing ring processing process are achieved. From the precise placement, mixing and drying of raw materials, to the melting, conveying and neutralization of materials, to the final pressing, molding and cooling polishing, the high quality and stability of the product are ensured. In addition, the introduction of the ultrasonic generator adds a safeguard to the processing process. Even if a small amount of material forms lumps or agglomerates, they can be broken up in time, ensuring processing quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the left side structure of the present invention; Figure 2 It is a schematic diagram of the structure on the right side of the present invention; Figure 3 This is a schematic diagram of the rear structure of the present invention; Figure 4 This is a schematic diagram of the structure of the present invention when viewed from above; Figure 5 This is a schematic diagram of the partial split structure of the mixing bin of the present invention; Figure 6 This is a schematic diagram of the internal structure of the melting machine of the present invention; Figure 7 This is a schematic diagram of the internal structure of the melting machine of the present invention when viewed from above; Figure 8 This is a schematic diagram of the overall structure of the inclined block of the present invention; Figure 9 For the present invention Figure 4 Enlarged structural diagram at point A in the middle.

[0014] Figure: 1. Bracket; 2. Workbench; 3. Support block; 4. Mixing chamber; 5. Observation window; 6. Raw material inlet; 7. Cover plate; 8. Stirring blade 1; 9. Drive motor; 10. Resistance heating coil; 11. Discharge valve; 12. Discharge pipe; 13. Melting machine; 14. Melting chamber; 15. Stirring blade 2; 16. Servo motor; 17. Heating element; 18. Through hole; 19. Electric push rod 1; 20. Sealing plate ; 21. Inclined block; 22. Temperature sensor; 23. Pneumatic diaphragm pump; 24. Inflow pipe; 25. Outflow pipe; 26. Electric push rod 2; 27. Connecting ring; 28. Ultrasonic generator; 29. ​​Base; 30. Slide rod; 31. Lower mold; 32. Upper mold; 33. Top plate; 34. Hydraulic cylinder; 35. Diverter chamber; 36. Ion air gun; 37. Diverter pipe 1; 38. Diverter pipe 2; 39. Diverter pipe 3. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0016] In a typical implementation of this application, please refer to Figures 1 to 9 As shown, the polytetrafluoroethylene sealing ring processing method includes the following steps: A1: Add raw materials. The staff opens the cover and puts the polytetrafluoroethylene material into the mixing chamber 4 through the raw material inlet 6. Then, the modifier, antioxidant, and lubricant are added into the mixing chamber 4 through the raw material inlet 6. A2: Mixing and drying: By turning on the drive motor 9, the output shaft of the drive motor 9 rotates and the stirring blade 8 rotates, so that the stirring blade 8 stirs and mixes the polytetrafluoroethylene material and the additive inside the mixing chamber 4. The resistance heating ring 10 dries the polytetrafluoroethylene material to ensure that it is free of moisture. A3: Melting and conveying: Open the discharge valve 11 to allow the mixed polytetrafluoroethylene material in the mixing chamber 4 to flow into the smelting chamber 14 through the discharge pipe 12 for melting, heating the polytetrafluoroethylene material to a molten state. The molten polytetrafluoroethylene material is then injected into the lower mold 31 through the through hole 18, the pneumatic diaphragm pump 23, the inlet pipe 24, and the outlet pipe 25 in sequence; A4: Neutralization: During the conveying process, static electricity generated by the contact or friction between the polytetrafluoroethylene material and the mold and conveying pipeline is neutralized through the diversion chamber 35, ion air gun 36, diversion pipe 1 37, diversion pipe 2 38 and diversion pipe 39; A5: Compression molding: The upper mold 32 is lowered by the hydraulic cylinder 34 to cooperate with the lower mold 31. Under a certain temperature and pressure, the molten polytetrafluoroethylene material in the lower mold 31 is compressed to form a sealing ring; A6: Cool the mold. After the temperature of the lower mold 31 and the upper mold 32 drops to 150-250°C, open the mold, remove the sealing ring, and then polish the parting line of the sealing ring.

[0017] In step A5, the certain temperature and pressure are: the temperature of hot pressing molding is 382-388° C., the pressure is 9-13 MPa, and the time is 2.5-3 hours.

[0018] The polytetrafluoroethylene sealing ring prepared through the above steps was subjected to mechanical property test. The mechanical properties obtained from the test are shown in the following table:

[0019] It can be seen from the data in the above table that with the increase of the proportion of modifier added, the tensile strength, elongation at break and hardness of the polytetrafluoroethylene sealing ring all show a gradually increasing trend, which shows that the addition of modifier can significantly improve the mechanical properties of the sealing ring, so that it can still maintain good elasticity and wear resistance under higher intensity working conditions. When the proportion of modifier added reaches 20%, the tensile strength of the sealing ring reaches 31.5 MPa, the elongation at break reaches 340%, and the hardness reaches 72 Shore A, showing excellent comprehensive mechanical properties.

[0020] The polytetrafluoroethylene sealing ring prepared through the above steps is subjected to chemical performance tests, including chemical corrosion resistance test, solvent resistance test and aging resistance test. Specifically: Test Example 1 For the chemical corrosion resistance test, the prepared polytetrafluoroethylene sealing ring samples were immersed in different concentrations of acid such as sulfuric acid, hydrochloric acid, alkali such as sodium hydroxide and organic solvents such as toluene and ethanol solution, ensuring that the samples were completely immersed. The immersion time was recorded. After immersion for a certain period of time, such as 24 hours, 48 ​​hours, and 72 hours, the samples were taken out, rinsed with deionized water and dried. The chemical corrosion resistance of the samples was evaluated by observing the appearance and mass change rate. The results are shown in the following table:

[0021] From the analysis of the results in the above table, the polytetrafluoroethylene sealing ring prepared by the method of the present invention exhibits good corrosion resistance in different chemical media, with minimal mass loss and no significant decrease in mechanical properties, indicating that it has excellent chemical stability and can adapt to a variety of complex chemical environments.

[0022] Test Example 2 For the solvent resistance test, the sealing ring samples were immersed in different organic solvents such as gasoline, diesel, and acetone, and the immersion time was recorded. After immersion for a certain period of time, such as 24 hours, 48 ​​hours, and 72 hours, the samples were taken out and the appearance and quality change rate of the samples were observed. The results are shown in the following table:

[0023] From the analysis of the results in the above table, the sealing ring prepared by the method of the present invention has a very small dimensional change rate and a mass change rate after being immersed in various organic solvents, and there is no obvious damage on the surface, showing good solvent resistance and being able to meet the long-term use requirements in an organic solvent environment.

[0024] Test Example 3 For the aging resistance test, seal ring samples were placed in an aging test chamber and subjected to accelerated aging conditions such as high temperature (e.g., 150°C), high humidity (e.g., 90% relative humidity), and light (e.g., ultraviolet radiation). The aging time was recorded. After a certain aging period, the samples were removed and their appearance and mechanical properties (e.g., tensile strength) were tested. The results are shown in the following table:

[0025] From the analysis of the results in the above table, the sealing ring prepared by the method of the present invention can still maintain good appearance and performance under accelerated aging conditions, and the decrease in tensile strength is small, showing excellent aging resistance and being able to effectively extend its service life.

[0026] As a preferred implementation in this embodiment, please refer to Figures 1 to 5 As shown, a polytetrafluoroethylene sealing ring processing equipment for implementing the method, the processing equipment includes: a bracket 1, a workbench 2 is fixedly installed on the top surface of the bracket 1, a plurality of support blocks 3 are fixedly installed on the top surface of the workbench 2, a mixing bin 4 is fixedly installed on the top surface of the plurality of support blocks 3, the outer surface of the mixing bin 4 is provided with a plurality of observation windows 5, a raw material inlet 6 is opened on the top surface of the mixing bin 4, a cover plate 7 is slidably installed on the inner wall of the raw material inlet 6, the inner wall of the mixing bin 4 is rotatably connected to a stirring blade 8, a drive motor 9 is fixedly installed on the left side wall of the mixing bin 4, the output shaft of the drive motor 9 is connected to the left side wall of the stirring blade 8, a plurality of resistance heating rings 10 are provided on the inner wall of the mixing bin 4, and a discharge valve 11 is provided on the bottom surface of the mixing bin 4.

[0027] Through the above features, the polytetrafluoroethylene material and the additives can be stirred and mixed. Specifically, the polytetrafluoroethylene material and the additives are turned into the interior of the mixing bin 4 through the raw material inlet 6, and then the cover 7 is closed. At this time, the drive motor 9 is turned on to rotate the drive motor 9, and the stirring blade 8 connected to the output shaft of the drive motor 9 rotates synchronously to stir and mix the polytetrafluoroethylene material and the additives inside the mixing bin 4. During this process, the resistance heating coil 10 will be turned on to dry the polytetrafluoroethylene material. After the mixing is completed, the staff can open the discharge valve 11 to allow the polytetrafluoroethylene material in the mixing bin 4 to flow into the melting device for the next operation.

[0028] As a preferred implementation in this embodiment, please refer to Figure 6 、 Figure 7 and Figure 8 As shown, the processing equipment also includes: a melting machine 13, which is fixedly mounted on the right side wall of the workbench 2, and a smelting bin 14 is fixedly mounted on the inner wall of the melting machine 13. A second stirring blade 15 is rotatably connected to the interior of the smelting bin 14. A servo motor 16 is fixedly mounted on the bottom surface of the smelting bin 14, and the output shaft of the servo motor 16 is connected to the bottom surface of the second stirring blade 15. A plurality of heating elements 17 are fixedly mounted on the top surface of the smelting bin 14. A temperature sensor 22 is fixedly mounted on the side wall of the melting machine 13 above the smelting bin 14. The processing equipment also includes a conveying component, a neutralization component and a pressing component.

[0029] Through the above features, the polytetrafluoroethylene material can be melted. Specifically, the staff opens the discharge valve 11. At this time, the polytetrafluoroethylene material in the mixing chamber 4 will flow into the melting chamber 14 through the discharge pipe 12. At this time, the heating element 17 above the melting chamber 14 starts to work. At this time, the servo motor 16 will also work synchronously, driving the stirring blade 2 15 to rotate, stirring the polytetrafluoroethylene material in the melting chamber 14. After the polytetrafluoroethylene material in the melting chamber 14 is melted, it is transported to the mold through the conveying assembly.

[0030] As a preferred implementation in this embodiment, please refer to Figure 3 、 Figure 6 、 Figure 7 、 Figure 8 and Figure 9As shown, the conveying assembly includes: a discharge pipe 12, one end of the discharge pipe 12 is connected to the bottom surface of the discharge valve 11, and the other end passes through the top surface of the melting machine 13 and extends to the top of the smelting bin 14, a through hole 18 is opened inside the smelting bin 14, an electric push rod 19 is fixedly installed on the bottom surface of the smelting bin 14, and a sealing plate 20 is fixedly installed on the output end of the electric push rod 19, an inclined block 21 is fixedly installed inside the melting machine 13, and the inclined block 21 is located below the through hole 18, an air-operated diaphragm pump 23 is fixedly installed inside the melting machine 13, an inlet pipe 24 is provided on one side of the air-operated diaphragm pump 23, and an outflow pipe 25 is provided on the other side, an electric push rod 26 is fixedly installed on the side wall of the melting machine 13, and a connecting ring 27 is fixedly installed on the output shaft of the electric push rod 26, the bottom surface of the connecting ring 27 is connected to the end of the outflow pipe 25, and an ultrasonic generator 28 is fixedly installed on the side wall of the connecting ring 27.

[0031] Through the above features, the molten polytetrafluoroethylene material can be delivered to the mold. Specifically, when the polytetrafluoroethylene material in the smelting bin 14 is melted, the electric push rod 19 starts to work, causing the sealing plate 20 connected to the output shaft of the electric push rod 19 to shrink. At this time, the molten polytetrafluoroethylene material in the smelting bin 14 flows into the inclined block 21 through the through hole 18. At this time, the electric push rod 26 will work, and when passing through the connecting ring 27, the end of the outflow pipe 25 follows the connecting ring 27 to move to the top of the lower mold 31. After that, the pneumatic diaphragm pump 23 starts to work, and the molten polytetrafluoroethylene material on the inclined block 21 is injected into the lower mold 31 through the inflow pipe 24 and the outflow pipe 25. It is worth mentioning that the smelting chamber 14 , the sealing plate 20 , the inlet pipe 24 and the outlet pipe 25 are all made of high temperature resistant materials.

[0032] As a preferred implementation in this embodiment, please refer to Figure 3 、 Figure 6 、 Figure 7 、 Figure 8 and Figure 9 As shown, the neutralization component includes: a diverter bin 35, which is fixedly installed inside the melting machine 13, and an ion air gun 36 is fixedly installed on the bottom surface of the diverter bin 35, and the air outlet of the ion air gun 36 is located in the diverter bin 35, and two diverter tubes 37 are fixedly installed on the top surface of the ion air gun 36, and the two diverter tubes 37 connect the diverter bin 35 with the top surface of the inclined block 21, and the side walls of the diverter bin 35 are respectively provided with diverter tubes 2 38 and diverter tubes 3 39, and the diverter tube 2 38 connects the diverter bin 35 with the top of the smelting bin 14, and the diverter tube 3 39 connects the diverter bin 35 with the discharge pipe 12.

[0033] Through the above-mentioned features, the static electricity generated when the polytetrafluoroethylene material contacts or rubs with other materials such as molds, conveying pipes, etc. can be neutralized to avoid the formation of lumps or agglomerations. Specifically, during the operation of the conveying component and the melting device, the ion wind gun 36 will work and spray ion wind in the diversion chamber 35, and the ion wind in the diversion chamber 35 will be injected to the top of the inclined block 21 through the diversion pipe 1 37, so that the static electricity generated in the melted polytetrafluoroethylene material is neutralized. The ion wind in the diversion chamber 35 will also be injected into the smelting chamber 14 and the discharge pipe 12 in turn through the diversion pipe 2 38 and the diversion pipe 3 39 to avoid the generation of static electricity during the transportation of the polytetrafluoroethylene material. If there is still a small amount of polytetrafluoroethylene material that forms lumps or agglomerates, when it is injected into the lower mold 31, the ultrasonic generator 28 will continue to work to break up the lumps or agglomerates of polytetrafluoroethylene material.

[0034] As a preferred implementation in this embodiment, please refer to Figure 3 and Figure 4 As shown, the pressing assembly includes: a base 29, which is arranged on one side of the melting machine 13, and a sliding rod 30 is fixedly installed at the four corners of the top surface of the base 29, and a lower mold 31 is provided on the top surface of the base 29, and an upper mold 32 is slidably connected to the sliding rod 30, and a top plate 33 is fixedly installed on the top surface of the sliding rod 30, and a hydraulic cylinder 34 is fixedly installed on the bottom surface of the top plate 33, and the output end of the hydraulic cylinder 34 is connected to the top surface of the upper mold 32.

[0035] Through the above features, the melted polytetrafluoroethylene material can be pressed into a sealing ring. Specifically, first, the electric push rod 26 will drive the end of the outflow tube 25 to contract to avoid affecting the movement of the upper mold 32. At this time, the hydraulic cylinder 34 will open and drive the upper mold 32 to move toward the lower mold 31, so that it cooperates with the lower mold 31 to press the melted polytetrafluoroethylene material into a sealing ring.

[0036] Working principle: When in use, the staff first opens the cover 7, and accurately puts the polytetrafluoroethylene material and other necessary additives such as modifiers, antioxidants, and lubricants into the mixing chamber 4 through the raw material inlet 6. This step ensures the accurate placement of the raw materials and lays a solid foundation for subsequent processing. Then, the drive motor 9 is started, and its output shaft drives the stirring blade 8 to rotate at high speed in the mixing chamber 4 to achieve full mixing of the polytetrafluoroethylene material and the additives. At the same time, the resistance heating coil 10 starts to work to dry the mixed material to ensure that there is no moisture residue. The mixing state can be monitored at any time. After the mixing is completed, the discharge valve 11 is opened, and the mixed polytetrafluoroethylene material flows smoothly into the smelting bin 14 through the discharge pipe 12. At this time, the heating element 17 in the smelting bin 14 is started, and the servo motor 16 drives the stirring blade 2 15 to rotate to melt the material. When the material reaches the molten state, the electric push rod 19 drives the sealing plate 20 to contract, and the molten material flows into the inclined block 21 through the through hole 18. Subsequently, the pneumatic diaphragm pump 23 is started to accurately transport the molten material to the lower mold through the inlet pipe 24 and the outlet pipe 25. 31, during which the electric push rod 26 ensures the precise positioning of the outflow pipe 25. During the transportation of the molten material, the ion wind gun 36 continues to work in the diversion chamber 35, and injects the ion wind into the upper part of the inclined block 21, the smelting chamber 14 and the discharge pipe 12 through the diversion pipe 1 37, the diversion pipe 2 38 and the diversion pipe 3 39, respectively, to effectively neutralize the static electricity that may be generated during the transportation and processing of the material, and prevent the occurrence of agglomeration and agglomeration. After the molten material is injected into the lower mold 31, the hydraulic cylinder 34 drives the upper mold 32 to descend steadily along the slide rod 30, and the lower mold 3 1. The molten material is pressed closely at a set temperature of 382-388°C and a pressure of 9-13 MPa for 2.5-3 hours until a complete sealing ring is formed. After the pressing is completed, the mold is cooled to 150-250°C, the mold is opened, the sealing ring is removed, and the parting line is finely polished to ensure the perfect appearance and performance of the product. During the entire processing process, the ultrasonic generator 28 continues to work at critical moments to ensure that even if a small amount of material forms agglomerates or agglomerates, they can be broken up in time to ensure processing quality and efficiency.

[0037] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for processing a polytetrafluoroethylene sealing ring, characterized in that: The following steps are involved: A1: Putting in the raw materials, the staff opens the cover plate (7), puts the polytetrafluoroethylene material into the mixing chamber (4) through the raw material inlet (6), and then adds the modifier, antioxidant, and lubricant into the mixing chamber (4) through the raw material inlet (6); A2: Mixing and drying, by turning on the driving motor (9), so that the output shaft of the driving motor (9) rotates and drives the stirring blade (8) to rotate, so that the stirring blade (8) stirs and mixes the polytetrafluoroethylene material and the additive inside the mixing chamber (4), and the polytetrafluoroethylene material is dried by the resistance heating ring (10) to ensure that it is free of moisture; A3: Melting and conveying, opening the discharge valve (11) to allow the mixed polytetrafluoroethylene material in the mixing chamber (4) to flow into the smelting chamber (14) through the discharge pipe (12) for melting, so that the polytetrafluoroethylene material is heated to a molten state, and the molten polytetrafluoroethylene material is injected into the lower mold (31) in sequence through the through hole (18), the pneumatic diaphragm pump (23), the inflow pipe (24) and the outflow pipe (25); A4: Neutralization: During the conveying process, static electricity generated when the polytetrafluoroethylene material contacts or rubs against the mold or the conveying pipeline is neutralized through the diversion chamber (35), the ion air gun (36), the diversion pipe 1 (37), the diversion pipe 2 (38) and the diversion pipe 3 (38); A5: Pressing and molding, the upper mold (32) is lowered by a hydraulic cylinder (34) so ​​as to cooperate with the lower mold (31), and the molten polytetrafluoroethylene material in the lower mold (31) is pressed at a certain temperature and pressure, thereby forming a sealing ring; A6: Cooling the mold. After the lower mold (31) and the upper mold (32) are cooled to 150-250°C, the mold is opened, the sealing ring is removed, and the mold line of the sealing ring is polished.

2. The method for processing a polytetrafluoroethylene sealing ring according to claim 1, characterized in that: In step A5, the certain temperature and pressure are: the temperature of hot pressing molding is 382-388° C., the pressure is 9-13 MPa, and the time is 2.5-3 hours.

3. A polytetrafluoroethylene sealing ring processing equipment for implementing the method according to any one of claims 1 to 2, characterized in that: The processing equipment includes: A support (1), wherein a workbench (2) is fixedly mounted on the top surface of the support (1), a plurality of support blocks (3) are fixedly mounted on the top surface of the workbench (2), a mixing bin (4) is fixedly mounted on the top surfaces of the plurality of support blocks (3), a plurality of observation windows (5) are arranged on the outer surface of the mixing bin (4), a raw material inlet (6) is opened on the top surface of the mixing bin (4), a cover plate (7) is slidably mounted on the inner wall of the raw material inlet (6), a stirring blade (8) is rotatably connected to the inner wall of the mixing bin (4), a driving motor (9) is fixedly mounted on the left side wall of the mixing bin (4), an output shaft of the driving motor (9) is connected to the left side wall of the stirring blade (8), a plurality of resistance heating coils (10) are arranged on the inner wall of the mixing bin (4), and a discharge valve (11) is arranged on the bottom surface of the mixing bin (4).

4. The polytetrafluoroethylene sealing ring processing equipment according to claim 3 is characterized in that: The processing equipment also includes: A melting machine (13), the melting machine (13) is fixedly mounted on the right side wall of the workbench (2), a melting chamber (14) is fixedly mounted on the inner wall of the melting machine (13), a second stirring blade (15) is rotatably connected inside the melting chamber (14), a servo motor (16) is fixedly mounted on the bottom surface of the melting chamber (14), an output shaft of the servo motor (16) is connected to the bottom surface of the second stirring blade (15), a plurality of heating elements (17) are fixedly mounted on the top surface of the melting chamber (14), a temperature sensor (22) is fixedly mounted on the side wall of the melting machine (13) located above the melting chamber (14), and the processing equipment further comprises a conveying component, a neutralizing component and a pressing component.

5. The polytetrafluoroethylene sealing ring processing equipment according to claim 4, characterized in that: The conveying assembly comprises: A discharge pipe (12), one end of which is connected to the bottom surface of the discharge valve (11), and the other end of which passes through the top surface of the melting machine (13) and extends to the top of the melting chamber (14); a through hole (18) is provided inside the melting chamber (14); an electric push rod (19) is fixedly installed on the bottom surface of the melting chamber (14); a sealing plate (20) is fixedly installed on the output end of the electric push rod (19); an inclined block (21) is fixedly installed inside the melting machine (13); the inclined block (21) is located at the through hole (18) ), a pneumatic diaphragm pump (23) is fixedly installed inside the melting machine (13), an inlet pipe (24) is provided on one side of the pneumatic diaphragm pump (23), and an outlet pipe (25) is provided on the other side, an electric push rod 2 (26) is fixedly installed on the side wall of the melting machine (13), and a connecting ring (27) is fixedly installed on the output shaft of the electric push rod 2 (26), the bottom surface of the connecting ring (27) is connected to the end of the outlet pipe (25), and an ultrasonic generator (28) is fixedly installed on the side wall of the connecting ring (27).

6. The polytetrafluoroethylene sealing ring processing equipment according to claim 4, characterized in that: The neutralization component comprises: A diversion bin (35) is fixedly installed inside the melting machine (13); an ion air gun (36) is fixedly installed on the bottom surface of the diversion bin (35); an air outlet of the ion air gun (36) is located in the diversion bin (35); two diversion pipes (37) are fixedly installed on the top surface of the ion air gun (36); the two diversion pipes (37) connect the diversion bin (35) with the top surface of the inclined block (21); a diversion pipe (38) and a diversion pipe (39) are respectively provided on the side walls of the diversion bin (35); the diversion pipe (38) connects the diversion bin (35) with the upper side of the smelting bin (14); and the diversion pipe (39) connects the diversion bin (35) with the discharge pipe (12).

7. The polytetrafluoroethylene sealing ring processing equipment according to claim 4, characterized in that: The pressing assembly comprises: A base (29), wherein the base (29) is arranged on one side of the melting machine (13), and sliding rods (30) are fixedly installed at the four corners of the top surface of the base (29), and a lower mold (31) is arranged on the top surface of the base (29), and an upper mold (32) is slidably connected to the sliding rod (30), and a top plate (33) is fixedly installed on the top surface of the sliding rod (30), and a hydraulic cylinder (34) is fixedly installed on the bottom surface of the top plate (33), and the output end of the hydraulic cylinder (34) is connected to the top surface of the upper mold (32).

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