A method of forming a polytetrafluoroethylene bushing for a stopcock valve

Abstract

The present application relates to the technical field of stopcock valve bushing production, and proposes a stopcock valve polytetrafluoroethylene bushing forming method, the forming of the bushing includes the following steps: step one: pressurization, sintering forming; step two: outer surface grinding; step three: turning forming; wherein, step one specifically includes: polytetrafluoroethylene is passed through a mold, pressurization is performed by a die casting device, the mold is placed in a sintering device, sintering is performed by the sintering device, after sintering is completed, a hollow cylindrical body rough casting is removed; step two specifically includes: the hollow cylindrical body rough casting is placed in a grinding device for grinding. Through the above technical solution, the existing stopcock valve polytetrafluoroethylene bushing forming processing is to rotate the raw material, the turning tool is usually horizontally moved for turning, but this way of cutting the raw material processing is relatively simple, since the blade only moves horizontally, the forming process is simple, but it cannot process complex structure bushing, and the application range is small.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stopcock valve bushing production, in particular to a stopcock valve polytetrafluoroethylene bushing forming method. BACKGROUND

[0002] The stopcock valve bushing is a structure used for sealing inside the stopcock valve, and the polytetrafluoroethylene is a high molecular compound formed by polymerization of tetrafluoroethylene, which has excellent chemical stability, corrosion resistance, sealing, high lubrication, electrical insulation and good aging resistance, and is therefore used in various construction machinery, mainly used for sealing or reducing noise in the connection between mechanical equipment, and mainly used for sealing in the stopcock valve;

[0003] After searching, the application publication number CN115716341A discloses a stopcock valve polytetrafluoroethylene bushing forming method, which adopts a batch preparation method for inner and outer sleeves, and wraps fiber filaments on the outer wall of the inner sleeve, and finally the inner and outer sleeves are joined and sintered twice to achieve the purpose of preparing a high-strength bushing.

[0004] However, the existing stopcock valve polytetrafluoroethylene bushing forming process is to rotate the raw material, and the turning tool is usually moved horizontally for turning, but this way of cutting the raw material processing is relatively simple, and since the blade only moves in the horizontal plane, the forming process is simple, but it cannot process complex bushings, and the scope of application is small. Therefore, we propose a stopcock valve polytetrafluoroethylene bushing forming method. SUMMARY

[0005] The present application proposes a stopcock valve polytetrafluoroethylene bushing forming method, which solves the problem of the existing stopcock valve polytetrafluoroethylene bushing forming process mentioned in the background art, which is to rotate the raw material, and the turning tool is usually moved horizontally for turning, but this way of cutting the raw material processing is relatively simple, and since the blade only moves in the horizontal plane, the forming process is simple, but it cannot process complex bushings, and the scope of application is small.

[0006] The technical scheme of the present application is as follows:

[0007] A stopcock valve polytetrafluoroethylene bushing forming method, the forming of the bushing includes the following steps:

[0008] Step 1: pressurize and sinter form;

[0009] Step 2: outer surface grinding;

[0010] Step 3: turning forming;

[0011] The step one specifically comprises: putting the polytetrafluoroethylene through a mold, pressurizing by a die casting equipment, putting the mold in a sintering equipment, sintering by the sintering equipment, and taking out the formed hollow cylindrical body roughcast after sintering is completed;

[0012] The step two specifically comprises: putting the hollow cylindrical body roughcast in a grinding equipment to grind the surface of the roughcast to a smooth state to form a processed piece;

[0013] The step three specifically comprises: putting the polished processed piece on a working equipment, turning the processed piece by a turning equipment, first turning the upper end shape of the outer groove, then cutting the one end of the processed piece by a cutting equipment to form the whole structure of the middle sleeve and the outer groove;

[0014] Then, the end of the processed piece is continuously turned by the turning equipment to turn the groove-shaped structure of the inner groove, and then the formed upper sleeve is cut by the cutting equipment;

[0015] Then, a section of the processed piece is cut by the cutting equipment to form a lower sleeve;

[0016] The middle sleeve, the upper sleeve and the lower sleeve are assembled to form a set of bushings.

[0017] As a further technical scheme of the present application, the equipment used for forming the bushing comprises a die casting equipment, a grinding equipment, a sintering equipment, a working table, a moving assembly for turning and a cutting assembly for cutting, the bushing comprises a middle sleeve, upper and lower ends of the middle sleeve are movably provided with an upper sleeve and a lower sleeve respectively, a lower end of the upper sleeve is provided with an inner groove, an upper end of the middle sleeve is fixedly connected with an outer groove matched with the inner groove, an outer surface of the working table is provided with a strip-shaped groove, a lower end of the moving assembly is provided with a telescopic base, an outer surface of the working table is provided with a positioning structure, an outer surface of a rear end of the working table is provided with a positioning electric cylinder, and an output end of the positioning electric cylinder is fixedly connected with a jacking plate.

[0018] As a further technical scheme of the present application, the positioning structure comprises a telescopic air cylinder fixedly connected to an outer surface of an upper end of the working table, an output end of the telescopic air cylinder is fixedly connected with a connecting bracket, a lower end of the connecting bracket is fixedly connected with a telescopic piece, a lower end of the telescopic piece is fixedly connected with a pressing plate, and an outer surface of the telescopic piece is sleeved with a jacking spring.

[0019] As a further technical scheme of the present application, the cutting assembly comprises a cutting bracket, a cutting knife is rotatably connected to a head end of the cutting bracket, and a cutting motor is fixedly connected to an outer surface of the cutting bracket corresponding to the center of the cutting knife.

[0020] As a further technical scheme of the present application, the inside of the telescopic base is lifted by an extendable air cylinder, the moving assembly comprises an electric guide rail fixedly connected to the top of the telescopic base, the outer surface of the moving assembly is slidably connected with a vertical guide rail, the outer surface of the vertical guide rail is slidably connected with a turning machine, one end of the vertical guide rail is fixedly connected with a bracket, a top drive air cylinder is connected between the bracket and the rear end of the turning machine, and the turning machine is used for turning the workpiece.

[0021] As a further technical scheme of the present application, the positioning cylinder is embedded on the outer surface of the rear end of the machining table, the movement of the machined object is realized by the contraction of the positioning cylinder, and the movement position of the machining piece is adjusted by the strip-shaped groove.

[0022] As a further technical scheme of the present application, the number of the positioning structures is two groups and is arrayed, the telescopic pieces are two groups of telescopic sliding sleeve joints, the lower end of the extrusion plate is fixedly connected with a layer of cushion layer, the cushion layer is made of anti-skid material, and the outer surface of the cushion layer is an arc structure matched with the outer surface of the machining piece.

[0023] As a further technical scheme of the present application, the number of the groups of the connecting brackets corresponding to the telescopic cylinders is two groups and is symmetrically distributed, and the positioning and fixing of the machining piece position are realized by the contraction of the telescopic cylinders.

[0024] As a further technical scheme of the present application, one end of the cutting bracket is fixedly connected with the output end of the robot, the cutting position of the cutting knife is adjusted by moving the robot, the output end of the cutting motor is fixedly connected with the cutting knife, and the machining piece is cut by the cutting knife.

[0025] As a further technical scheme of the present application, the electric guide rail is perpendicular to the vertical guide rail, the telescopic end of the top drive air cylinder is fixedly connected with the turning machine, the machining piece is turned by the turning machine, and the vertical guide rail slides along the length direction of the electric guide rail.

[0026] The working principle and beneficial effects of the present application are as follows:

[0027] In the present application, the machining piece can be conveniently fixed by the action of the positioning structure, so that one end of the machining piece can be conveniently machined, and the mode of fixing the machining piece in traditional machining is changed, the machining of the machining piece in complex conditions can be coped with, and the machining effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0028] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0029] Figure 1 It is an overall structure schematic view of the formed bushing of the present application.

[0030] Figure 2 A schematic diagram of the partial structure of the disassembled bushing of the present invention;

[0031] Figure 3 It is a structural schematic diagram of the forming part device of the present invention;

[0032] Figure 4 For the present invention Figure 3 Schematic diagram of the local structure from another perspective;

[0033] Figure 5 For the present invention Figure 3 Schematic diagram of the local structure at the middle positioning structure;

[0034] Figure 6 For the present invention Figure 3 Schematic diagram of the local structure of the moving component.

[0035] In the figure: 1. middle sleeve; 2. upper sleeve; 3. lower sleeve; 4. inner groove; 5. outer groove; 6. processing table; 7. telescopic base; 8. strip groove; 9. processing part; 10. positioning structure; 101. telescopic cylinder; 102. connecting bracket; 103. telescopic part; 104. extrusion plate; 105. ejecting spring; 11. moving assembly; 111. electric guide rail; 112. vertical guide rail; 113. turning machine; 114. ejecting cylinder; 12. cutting assembly; 121. cutting bracket; 122. cutter; 123. cutting motor; 13. positioning electric cylinder; 14. ejecting plate. DETAILED DESCRIPTION

[0036] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 any creative efforts are within the scope of protection of the present invention. Example 1

[0037] like Figures 1-5 As shown, this embodiment provides a method for forming a polytetrafluoroethylene bushing for a plug valve, and the bushing forming includes the following steps:

[0038] Step 1: Pressurization and sintering;

[0039] Step 2: Surface grinding;

[0040] Step 3: Turning forming;

[0041] The step one specifically comprises: putting the polytetrafluoroethylene through a mold, pressurizing by a pressure casting equipment, putting the mold in a sintering equipment, sintering by the sintering equipment, and taking out the formed hollow cylindrical body roughcast after sintering is completed;

[0042] The step two specifically comprises: putting the hollow cylindrical body roughcast in a grinding equipment to grind the surface of the roughcast to a smooth state to form the processed piece 9.

[0043] The step three specifically comprises: putting the polished processed piece 9 on a working equipment, turning the processed piece 9 by a turning equipment, first turning the upper end shape of the outer groove 5, then cutting the one end of the processed piece 9 by a cutting equipment to form the integral structure of the middle sleeve 1 and the outer groove 5.

[0044] Then, the end of the processed piece 9 is continuously turned by the turning equipment to turn the groove-shaped structure of the inner groove 4, and then the formed upper sleeve 2 is cut by the cutting equipment.

[0045] Then, a section of the processed piece 9 is cut by the cutting equipment to form the lower sleeve 3.

[0046] The middle sleeve 1, the upper sleeve 2 and the lower sleeve 3 are assembled to form a set of bushings.

[0047] The equipment used for forming the bushing comprises a pressure casting equipment, a grinding equipment, a sintering equipment, a processing table 6, a moving assembly 11 for turning and a cutting assembly 12 for cutting. The bushing comprises the middle sleeve 1, the upper sleeve 2 and the lower sleeve 3 movably arranged at the upper and lower ends of the middle sleeve 1 respectively, the inner groove 4 arranged at the lower end of the upper sleeve 2, the outer groove 5 fixedly connected with the inner groove 4 and arranged at the upper end of the middle sleeve 1, the strip-shaped groove 8 arranged on the outer surface of the processing table 6, the telescopic base 7 arranged at the lower end of the moving assembly 11, the positioning structure 10 arranged on the outer surface of the processing table 6, the positioning electric cylinder 13 arranged on the outer surface of the rear end of the processing table 6, and the top driving plate 14 fixedly connected with the output end of the positioning electric cylinder 13.

[0048] The positioning structure 10 comprises the telescopic cylinder 101 fixedly connected with the outer surface of the upper end of the processing table 6, the connecting bracket 102 fixedly connected with the output end of the telescopic cylinder 101, the telescopic piece 103 fixedly connected with the lower end of the connecting bracket 102, the extrusion plate 104 fixedly connected with the lower end of the telescopic piece 103, and the top driving spring 105 sleeved with the outer surface of the telescopic piece 103.

[0049] The positioning structure 10 is in two groups and arrayed, the telescopic part 103 is a columnar structure which is telescopic and sleeved, the lower end of the extrusion plate 104 is fixedly connected with a layer of cushion layer, the cushion layer is made of anti-skid material and the outer surface of the cushion layer is arc-shaped matching the outer surface of the workpiece 9; the number of the set of connecting supports 102 corresponding to the telescopic cylinders 101 is two and symmetrically distributed, and the position of the workpiece 9 is fixed by the contraction of the telescopic cylinders 101.

[0050] In the embodiment, the workpiece 9 can be conveniently fixed, so that the end of the workpiece 9 can be conveniently machined, and the mode of fixing the workpiece 9 in traditional machining is changed, the machining of the workpiece 9 in complex conditions can be coped with, the machining effect is better, and after the turning of the end of the workpiece 9 is completed, the workpiece 9 can be cut in sections, so that bushing structures of different lengths can be machined. Embodiment 2

[0051] As shown in Figure 6 on the basis of embodiment 1, it is further proposed that the inside of the telescopic base 7 is lifted by an extendable cylinder, the moving assembly 11 comprises an electric guide rail 111 fixedly connected to the lifting top of the telescopic base 7, the outer surface of the moving assembly 11 is slidably connected with a vertical guide rail 112, the outer surface of the vertical guide rail 112 is slidably connected with a turning machine 113, one end of the vertical guide rail 112 is fixedly connected with a support, and a jacking cylinder 114 is connected between the support and the rear end of the turning machine 113, and the turning machine 113 is used for turning the workpiece.

[0052] The electric guide rail 111 is perpendicular to the vertical guide rail 112, the telescopic end of the jacking cylinder 114 is fixedly connected with the turning machine 113, the workpiece 9 is turned by the turning machine 113, and the vertical guide rail 112 slides along the length direction of the electric guide rail 111.

[0053] In the embodiment, the position of the turning machine 113 can be adjusted in three-dimensional structure, so that the turning machine 113 can machine different machining parts of the workpiece 9, and the characteristics of different parts of the turning machine 113 can be adjusted to meet the turning machining of workpieces of different sizes. Embodiment 3

[0054] On the basis of embodiment 2, it is further proposed that the cutting assembly 12 comprises a cutting support 121, the head end of the cutting support 121 is rotatably connected with a cutting knife 122, and the outer surface of the cutting support 121 is fixedly connected with a cutting motor 123 at the center of the cutting knife 122.

[0055] The one end of the cutting support 121 which is originally fixed with the cutter 122 is fixedly connected with the output end of the mechanical arm, the cutter 122 is fixedly connected with the output end of the cutting motor 123, and the cutter 122 is used for cutting the workpiece 9.

[0056] In summary, in the use process, the user first places the workpiece 9 in the strip-shaped groove 8, and then shrinks the positioning electric cylinder 13 until the abutting plate 14 is attached to one end of the workpiece 9, and then shrinks the telescopic cylinder 101 to drive the connecting support 102 and the telescopic part 103 to move downward until the lower end of the extrusion plate 104 extrudes and fixes the position of the workpiece 9, at this time, the telescopic part 103 is retracted, the abutting spring 105 abuts the extrusion plate 104 to move downward, and at this time, the workpiece 9 is abutted and extruded by the extrusion plate 104 to be fixed;

[0057] After the workpiece 9 is fixed, the telescopic base 7 is telescoped to move the moving assembly 11 to a suitable machining height, the vertical guide rail 112 is moved transversely on the electric guide rail 111 to a suitable position, the turning machine 113 is moved by the extension of the abutting cylinder 114, and the machining head of the turning machine 113 is used for turning the workpiece 9, at this time, the outer groove 5 of the center sleeve 1 or the inner groove 4 of the upper sleeve 2 is machined according to the cooperation of the moving assembly 11 and the telescopic base 7.

[0058] After the inner groove 4 or the outer groove 5 is machined, the cutter 122 is moved by the mechanical arm to approach the machining head of the workpiece 9, the machining head of the workpiece 9 is cut by the cutter 122, and part of the sleeve is obtained, according to the actual production needs, the upper sleeve 2, the center sleeve 1 or the lower sleeve 3 can be produced respectively, and cutting is performed, and the machining is completed.

[0059] It should be noted that when the workpiece 9 is not long enough to extend from the outer surface of the front end of the machining table 6, the telescopic cylinder 101 is extended, so that the extrusion plate 104 is separated from the workpiece 9, at this time, the positioning electric cylinder 13 is retracted to a suitable distance, and the workpiece 9 is fixed by the positioning structure 10, and the machining is performed.

[0060] It should be noted that the workpiece 9 in the application is a hollow cylindrical structure.

[0061] The above is only a preferred embodiment of the application, and is not used to limit the application, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application should be included in the protection scope of the application.

Claims

1. A method for forming a polytetrafluoroethylene bushing for a plug valve, characterized in that: The forming of the bushing includes the following steps: Step 1: Pressurization and sintering; Step 2: Surface grinding; Step 3: Turning forming; The first step specifically includes: passing polytetrafluoroethylene through a mold, pressurizing it through a die-casting device, placing the mold in a sintering device, sintering it through the sintering device, and after sintering, removing the formed hollow cylindrical blank; Step 2 specifically includes: placing the hollow cylindrical blank in a grinding device for grinding, grinding the surface of the blank to a smooth state, and forming a workpiece (9); Step three specifically includes: placing the polished workpiece (9) on the working equipment, turning the workpiece (9) by a turning device, first turning out the upper end shape of the outer groove (5), and then cutting one end of the workpiece (9) by a cutting device to form an integral structure of the middle sleeve (1) and the outer groove (5); The end of the workpiece (9) is then turned by a turning device to form a groove-shaped structure of the inner groove (4), and then the upper sleeve (2) is cut into shape by a cutting device; Then, a section of the workpiece is cut by a cutting device to form a lower sleeve (3); Assembling the middle sleeve (1), the upper sleeve (2) and the lower sleeve (3) to form a set of bushings; The equipment used for bushing molding includes die-casting equipment, grinding equipment, sintering equipment and a processing table (6), as well as a moving component (11) for turning and a cutting component (12) for cutting. The bushing includes a middle sleeve (1), and the upper and lower ends of the middle sleeve (1) are respectively movably provided with an upper sleeve (2) and a lower sleeve (3), the lower end of the upper sleeve (2) is provided with an inner groove (4), the upper end of the middle sleeve (1) is fixedly connected with an outer groove (5) matching the inner groove (4), the outer surface of the processing table (6) is provided with a strip groove (8), the lower end of the moving component (11) is provided with a telescopic base (7), the outer surface of the processing table (6) is provided with a positioning structure (10), the outer surface of the rear end of the processing table (6) is provided with a positioning electric cylinder (13), and the output end of the positioning electric cylinder (13) is fixedly connected with a top plate (14).

2. The method for forming a polytetrafluoroethylene bushing for a plug valve according to claim 1, characterized in that: The positioning structure (10) comprises a telescopic cylinder (101) fixedly connected to the outer surface of the upper end of the processing table (6); the output end of the telescopic cylinder (101) is fixedly connected to a connecting bracket (102); the lower end of the connecting bracket (102) is fixedly connected to a telescopic member (103); the lower end of the telescopic member (103) is fixedly connected to an extrusion plate (104); and the outer surface of the telescopic member (103) is sleeved with a push spring (105).

3. The method for forming a polytetrafluoroethylene bushing for a plug valve according to claim 2, characterized in that: The cutting assembly (12) comprises a cutting bracket (121), a head end of the cutting bracket (121) being rotatably connected to a cutter (122), and a cutting motor (123) being fixedly connected to an outer surface of the cutting bracket (121) corresponding to the center of the cutter (122).

4. The method for forming a polytetrafluoroethylene bushing for a plug valve according to claim 1, characterized in that: The interior of the telescopic base (7) is lifted and lowered by an extendable cylinder. The moving assembly (11) includes an electric guide rail (111) fixedly connected to the lifting top of the telescopic base (7). The outer surface of the moving assembly (11) is slidably connected to a vertical guide rail (112). The outer surface of the vertical guide rail (112) is slidably connected to a turning machine (113). One end of the vertical guide rail (112) is fixedly connected to a bracket. A top cylinder (114) is connected between the bracket and the rear end of the turning machine (113). The turning machine (113) is used to turn a workpiece.

5. The method for forming a polytetrafluoroethylene bushing for a plug valve according to claim 1, characterized in that: The positioning electric cylinder (13) is embedded in the rear end outer surface of the processing table (6), and the processing object is moved by contraction of the positioning electric cylinder (13), and the moving position of the processing workpiece (9) is adjusted by the strip groove (8).

6. The method for forming a polytetrafluoroethylene bushing for a plug valve according to claim 2, characterized in that: The number of the positioning structures (10) is two groups and they are distributed in an array. The telescopic parts (103) are two groups of telescopic sliding sleeve columnar structures. The outer surface of the lower end of the extrusion plate (104) is fixedly connected with a cushion layer, which is made of anti-slip material and has an outer surface of an arc structure that matches the outer surface of the processed part (9).

7. The method for forming a polytetrafluoroethylene bushing for a plug valve according to claim 6, characterized in that: The number of telescopic cylinders (101) corresponding to one set of the connecting brackets (102) is two and they are symmetrically distributed. The position of the workpiece (9) is positioned and fixed by the contraction of the telescopic cylinders (101).

8. The method for forming a polytetrafluoroethylene bushing for a plug valve according to claim 3, characterized in that: One end of the cutting blade (122) of the cutting bracket (121) is fixedly connected to the output end of the manipulator, and the cutting position of the cutting blade (122) is adjusted by the movement of the manipulator. The output end of the cutting motor (123) is fixedly connected to the cutting blade (122), and the workpiece (9) is cut by the cutting blade (122).

9. The method for forming a polytetrafluoroethylene bushing for a plug valve according to claim 4, characterized in that: The electric guide rail (111) is perpendicular to the vertical guide rail (112), and the telescopic end of the push cylinder (114) is fixedly connected to the turning machine (113). The workpiece (9) is turned by the turning machine (113), and the vertical guide rail (112) slides along the length direction of the electric guide rail (111).

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