Polytetrafluoroethylene film airtight ring as well as shaping mold and vulcanizing mold thereof

Abstract

The utility model relates to the technical field of rubber products, and provides a polytetrafluoroethylene film airtight ring with only one splicing seam, and the polytetrafluoroethylene film airtight ring with one splicing seam is realized through a corresponding production process and a shaping mold and a vulcanizing mold used in the production process. Comprising an airtight ring body, a working face is formed on one side wall of the airtight ring body, a fixing face is formed on the other side wall of the airtight ring body, and a groove is formed between the fixing face and the working face. And a polytetrafluoroethylene film layer is arranged on the working surface. The polytetrafluoroethylene film airtight ring subjected to composite shaping is loaded into a vulcanization mold, the two ends of the polytetrafluoroethylene film airtight ring are in butt joint flatly, the vulcanization mold is assembled and loaded into a press vulcanizer for integral vulcanization forming, and the vulcanized product polytetrafluoroethylene film airtight ring only has one splicing seam.

Description

Technical Field

[0001] This utility model relates to the field of rubber product technology, specifically to a polytetrafluoroethylene film airtight ring and its shaping mold and vulcanization mold. Background Technology

[0002] Airtight rings are airtight products used in large equipment. They are relatively large, generally with an outer diameter between Ф900 and Ф1500 mm, and some even larger than Ф1500 mm. A polytetrafluoroethylene (PTFE) film is laminated to the surface of the airtight ring. Due to the large size of the airtight ring, it is impossible to laminate the PTFE film onto the product surface as a single piece. Therefore, the PTFE film must be laminated in several segments. Currently, the PTFE film needs to be laminated in at least four pieces to cover the rubber part of the airtight ring. This results in at least four PTFE film seams on the surface of the finished airtight ring. Numerous seams reduce the overall performance of the airtight ring, and the absence of PTFE film at the seams increases friction, posing a risk of reduced airtightness. Utility Model Content

[0003] The technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a polytetrafluoroethylene film airtight ring with only one splicing seam. The polytetrafluoroethylene film airtight ring with only one splicing seam is achieved through a corresponding production process and the shaping mold and vulcanization mold used in the production process.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a polytetrafluoroethylene (PTFE) film airtight ring, including an airtight ring body, a working surface formed on one side wall of the airtight ring body, a fixing surface formed on the other side wall of the airtight ring body, and a groove formed between the fixing surface and the working surface; the fixing surface includes a straight edge; the working surface includes a working surface straight edge, a working surface transition edge I, a working surface inclined edge, a working surface transition edge II, and a working surface abutment edge connected in sequence; the working surface inclined edge extends obliquely from the connecting end of the working surface transition edge I away from the fixing surface and connects to the working surface transition edge II, and the working surface straight edge is connected to the fixing surface straight edge through a bottom edge; the groove includes a groove straight edge, a groove inclined edge, and a groove arc edge, one end of the groove arc edge is connected to one end of the groove inclined edge, the other end of the groove inclined edge is connected to the working surface abutment edge through an arc edge, the other end of the groove arc edge is connected to one end of the groove straight edge, and the other end of the groove straight edge is connected to the fixing surface straight edge through a straight edge; a layer of polytetrafluoroethylene (PTFE) film is provided on the working surface.

[0005] Furthermore, one end of the polytetrafluoroethylene film layer is aligned with the bottom edge, and the other end of the polytetrafluoroethylene film layer extends to the junction of the arc edge and the oblique edge of the groove.

[0006] Furthermore, the highest point at the center of the arc edge is lower than that of the straight edge.

[0007] The manufacturing process of polytetrafluoroethylene (PTFE) film hermetic rings includes the following steps:

[0008] S1. The airtight ring body is made into a long strip, and the polytetrafluoroethylene film layer is made into a long strip, with the length of the polytetrafluoroethylene film layer being greater than the length of the airtight ring body.

[0009] S2. The long strip-shaped airtight ring body is inserted into the lower mold of the shaping mold, and the middle mold is attached to the straight edge, groove straight edge, groove arc edge, and groove oblique edge of the working surface. Then, the long strip-shaped polytetrafluoroethylene film layer is laid on the working surface of the airtight ring body, and the upper mold is closed.

[0010] S3. The shaping mold is vulcanized and shaped by applying pressure and heating with a flat vulcanizing machine to obtain a polytetrafluoroethylene film layer composite on the working surface.

[0011] S4. Repeat step S3 until the long strip of polytetrafluoroethylene film layer is evenly covered and bonded to the long strip of airtight ring body to obtain a shaped semi-finished product.

[0012] S5. Trim the shaped semi-finished product obtained in step S4, removing excess polytetrafluoroethylene film layer and adhesive edge.

[0013] S6. Cut both ends of the shaped semi-finished product obtained in step S5 flat and put it into the vulcanizing lower mold of the vulcanizing mold. First, put one end of the shaped semi-finished product into the vulcanizing docking point of the vulcanizing lower mold, and then put the other end of the shaped semi-finished product around the vulcanizing lower mold until it reaches the vulcanizing docking point. At this time, one end of the shaped semi-finished product is in contact with the other end. Then, attach the vulcanizing middle mold of the vulcanizing mold to the straight edge of the fixed surface of the airtight ring body, and then close the vulcanizing upper mold of the vulcanizing mold.

[0014] S7. The vulcanizing mold is pressurized and heated by a flat vulcanizing machine to form a finished circular polytetrafluoroethylene film airtight ring.

[0015] S8. The PTFE film airtight ring obtained in step S7 has only one splicing seam.

[0016] A shaping mold for a polytetrafluoroethylene film airtight ring includes a lower shaping mold, a middle shaping mold I, a middle shaping mold II, and an upper shaping mold; the lower shaping mold is inserted into the airtight ring body, the middle shaping mold I fixes the airtight ring body from one side of the working surface, the middle shaping mold II fixes the airtight ring body from one side of the groove, and the upper shaping mold presses the airtight ring body.

[0017] Further, the lower mold includes lower feature surface I, lower feature surface II, lower feature surface III, lower feature surface IV, lower feature surface V, lower feature surface VI, and lower feature surface VII; the middle mold I includes upper center feature surface I, upper center feature surface II, upper center feature surface III, upper center feature surface IV, and upper center feature surface V; the middle mold II includes lower center feature surface I, lower center feature surface II, lower center feature surface III, lower center feature surface IV, lower center feature surface V, lower center feature surface VI, and lower center feature surface VII; and the upper mold includes upper feature surface I, upper feature surface II, upper feature surface III, upper feature surface IV, and upper feature surface V.

[0018] Furthermore, the lower feature surface IV is used to place the airtight ring body, and the straight edge of the fixed surface is attached to the lower feature surface IV; the upper center feature surface III mates with the straight edge of the working surface and its polytetrafluoroethylene film layer, and the lower feature surface III; the upper center feature surface I mates with the lower feature surface I; the upper center feature surface II mates with the lower feature surface II; the lower center feature surface I mates with the arc edge of the groove; the lower center feature surface II mates with the straight edge of the groove and the lower feature surface V; and the lower center feature surface III mates with the lower feature surface VI. The fixed lower feature surface IV mates with the fixed lower feature surface VII, and the fixed lower feature surface VII mates with the groove chamfer; the fixed upper feature surface I mates with the fixed upper feature surface V, the fixed upper feature surface II mates with the fixed upper feature surface IV, the fixed upper feature surface III mates with the working surface transition edge I, the working surface chamfer, the working surface transition edge II, the working surface abutment edge, the arc edge, and their polytetrafluoroethylene film layer; the fixed upper feature surface IV mates with the fixed lower feature surface VI, and the fixed upper feature surface V mates with the fixed lower feature surface V.

[0019] A vulcanizing mold for a polytetrafluoroethylene (PTFE) film airtight ring includes an upper vulcanizing mold, two middle vulcanizing molds, and a lower vulcanizing mold. The middle vulcanizing molds are semi-circular in shape. A shaped semi-finished product is inserted into the lower vulcanizing mold. One end of the shaped semi-finished product is first inserted into the mating point, and the other end is wrapped back to the mating point to fit against one end of the shaped semi-finished product. The two middle vulcanizing molds are respectively inserted from the left and right sides of the lower vulcanizing mold and pressed against the straight edge of the fixed surface. The two middle vulcanizing molds are joined together to form a circle. The upper vulcanizing mold is pressed against the groove from the top of the lower vulcanizing mold.

[0020] Further, the upper vulcanizing mold includes sulfur upper characteristic surface I, sulfur upper characteristic surface II, sulfur upper characteristic surface III, sulfur upper characteristic surface IV, sulfur upper characteristic surface V, sulfur upper characteristic surface VI, sulfur upper characteristic surface VII, sulfur upper characteristic surface VIII, sulfur upper characteristic surface IX, and sulfur upper characteristic surface X; the middle vulcanizing mold includes sulfur middle characteristic surface I, sulfur middle characteristic surface II, sulfur middle characteristic surface III, sulfur middle characteristic surface IV, sulfur middle characteristic surface V, sulfur middle characteristic surface VI, and sulfur middle characteristic surface VII; the lower vulcanizing mold includes sulfur lower characteristic surface I, sulfur lower characteristic surface II, sulfur lower characteristic surface III, sulfur lower characteristic surface IV, sulfur lower characteristic surface V, sulfur lower characteristic surface VI, sulfur lower characteristic surface VII, sulfur lower characteristic surface VIII, sulfur lower characteristic surface IX, and sulfur lower characteristic surface X.

[0021] Furthermore, the lower sulfur feature surface V mates with the arc edge with the polytetrafluoroethylene (PTFE) film layer; the lower sulfur feature surface VI mates with the working surface abutting edge, working surface transition edge II, working surface inclined edge, and working surface transition edge I with the PTFE film layer; the lower sulfur feature surface VII mates with the straight edge of the working surface with the PTFE film layer; and the lower sulfur feature surface VIII mates with the bottom edge. The middle sulfur feature surface II mates with the straight edge of the fixed surface; the middle sulfur feature surface III mates with the lower sulfur feature surface VIII; the middle sulfur feature surface IV mates with the lower sulfur feature surface IX; and the middle sulfur feature surface V mates with the lower sulfur feature surface X.

[0022] The sulfur upper feature surface VI mates with the arc edge of the groove; the sulfur upper feature surface V mates with the inclined edge of the groove; the sulfur upper feature surface VII mates with the straight edge of the groove; the sulfur upper feature surface IV mates with the sulfur lower feature surface IV; the sulfur upper feature surface III mates with the sulfur lower feature surface III; the sulfur upper feature surface II mates with the sulfur lower feature surface II; the sulfur upper feature surface I mates with the sulfur lower feature surface I; the sulfur upper feature surface VIII mates with the sulfur middle feature surface VI; the sulfur upper feature surface IX mates with the sulfur middle feature surface I; and the sulfur upper feature surface X mates with the sulfur middle feature surface VII.

[0023] The advantages of this utility model of a polytetrafluoroethylene film airtight ring and its shaping mold and vulcanizing mold are:

[0024] The fixed side of the PTFE film airtight ring is bonded to Equipment I, while the working side with the PTFE film layer faces Equipment II. This compresses the PTFE film airtight ring to achieve a sealing effect. When Equipment II moves, it comes into contact with the PTFE film layer. Due to the low surface friction coefficient of the PTFE film layer, the resistance to movement is reduced, allowing the equipment to operate stably while ensuring airtightness.

[0025] The new PTFE film-coated hermetic ring manufacturing process solves the problem of several seams appearing on the surface of large-size hermetic rings after laminating them with PTFE film. This eliminates the need for segmented PTFE film application for hermetic rings and similar products. The process can meet the requirements for laminating PTFE film onto the surface of any size hermetic ring. By pre-forming the film into strips, laminating and shaping it, and then vulcanizing it, the PTFE film is applied to the required positions on the hermetic ring rubber, ensuring coating quality and improving product yield.

[0026] By utilizing the production process of PTFE film airtight rings and the combination of its shaping mold and vulcanization mold, the produced PTFE film airtight rings have high surface quality and are wrinkle-free. The airtight ring body, which is the rubber part, and the PTFE film layer are tightly bonded together, and only one splicing seam is needed to obtain a finished circular PTFE film airtight ring.

[0027] The long, airtight ring body is inserted into the shaping mold, and the long, PTFE film layer is laid on the working surface. The shaping mold is closed and the shape is formed by pressure application through a flat vulcanizing machine to obtain a composite of PTFE film layer and airtight ring body.

[0028] After the composite shaping, the PTFE film airtight ring is installed into the vulcanization mold. The two ends of the PTFE film airtight ring are aligned flat. The vulcanization mold is closed and installed into a flat vulcanizing machine for overall vulcanization. The vulcanized product, the PTFE film airtight ring, has only one splicing seam. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the airtight ring body structure in this utility model;

[0030] Figure 2 This is a schematic diagram of the gas-tight ring structure of the polytetrafluoroethylene film in this utility model;

[0031] Figure 3 This is a schematic diagram of the shaping mold structure in this utility model;

[0032] Figure 4 This utility model Figure 3 Schematic diagram of the AA-direction structure;

[0033] Figure 5 This utility model Figure 4 A schematic diagram of the exploded structure;

[0034] Figure 6 This is a schematic diagram of the vulcanizing mold structure in this utility model;

[0035] Figure 7 This utility model Figure 6 Enlarged schematic diagram of the explosion structure at point B;

[0036] Figure 8 This is a schematic diagram of the vulcanization lower mold structure in this utility model;

[0037] Figure 9 This is a schematic diagram of the vulcanization intermediate mold splicing structure in this utility model;

[0038] Figure 10 This is a schematic diagram of the polytetrafluoroethylene film airtight ring in use. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] A polytetrafluoroethylene (PTFE) film hermetic ring includes a hermetic ring body 1. One side wall of the hermetic ring body 1 has a working surface 11, and the other side wall has a fixing surface 12. A groove 13 is formed between the fixing surface 12 and the working surface 11. The fixing surface 12 includes a straight edge 121. The working surface 11 includes, in sequence, a straight edge 111, a transition edge I 114, a beveled edge 112, a transition edge II 115, and an abutment edge 113. The beveled edge 112 extends obliquely from the connecting end of the transition edge I 114 away from the fixing surface 12. Connected to the transition edge II 115 of the working surface, the straight edge 111 of the working surface is connected to the straight edge 121 of the fixed surface through the bottom edge 16; the groove 13 includes a groove straight edge 131, a groove inclined edge 132, and a groove arc edge 133. One end of the groove arc edge 133 is connected to one end of the groove inclined edge 132, the other end of the groove inclined edge 132 is connected to the working surface abutment edge 113 through the arc edge 14, the other end of the groove arc edge 133 is connected to one end of the groove straight edge 131, and the other end of the groove straight edge 131 is connected to the straight edge 121 of the fixed surface through the straight edge 15; a polytetrafluoroethylene film layer 2 is provided on the working surface 11.

[0045] Furthermore, one end of the polytetrafluoroethylene film layer 2 is aligned with the bottom edge 16, and the other end of the polytetrafluoroethylene film layer 2 extends to the connection between the arc edge 14 and the groove inclined edge 132.

[0046] Furthermore, the highest point of the center of the arc edge 14 is lower than that of the straight edge 15.

[0047] The manufacturing process of polytetrafluoroethylene (PTFE) film hermetic rings includes the following steps:

[0048] S1. The airtight ring body is made into a long strip, and the polytetrafluoroethylene film layer is made into a long strip, with the length of the polytetrafluoroethylene film layer being greater than the length of the airtight ring body.

[0049] The longitudinal section of the elongated airtight ring body is the same as the longitudinal section structure of the finished polytetrafluoroethylene film airtight ring, and the length of the elongated airtight ring body is greater than the circumference of the finished polytetrafluoroethylene film airtight ring.

[0050] S2. The long strip-shaped airtight ring body is inserted into the lower mold of the shaping mold, and the middle mold is attached to the straight edge, groove straight edge, groove arc edge, and groove oblique edge of the working surface. Then, the long strip-shaped polytetrafluoroethylene film layer is laid on the working surface of the airtight ring body, and the upper mold is closed.

[0051] The specific method of using the shaping mold is as follows: Place the airtight ring body 1 on the lower feature surface IV314, and attach one side of the straight edge 121 of the fixed surface to the lower feature surface IV314.

[0052] The upper center feature surface Ⅲ323 is bonded to the straight edge 111 of the working surface and its polytetrafluoroethylene film layer 2, and the lower center feature surface Ⅲ313; the upper center feature surface Ⅰ321 is bonded to the lower center feature surface Ⅰ311; and the upper center feature surface Ⅱ322 is bonded to the lower center feature surface Ⅱ312.

[0053] The lower center feature surface I 331 is in contact with the arc edge of the groove 133; the lower center feature surface II 332 is in contact with the straight edge of the groove 131 and the lower center feature surface V 315; the lower center feature surface III 333 is in contact with the lower center feature surface VI 316; the lower center feature surface IV 334 is in contact with the lower center feature surface VII 317; and the lower center feature surface VII 337 is in contact with the inclined edge of the groove 132.

[0054] The upper feature surface I341 is attached to the upper center feature surface V325, the upper feature surface II342 is attached to the upper center feature surface IV324, the upper feature surface III343 is fitted with the working surface transition edge I114, the working surface inclined edge 112, the working surface transition edge II115, the working surface abutment edge 113, the arc edge 14 and its polytetrafluoroethylene film layer 2, the upper feature surface IV344 is attached to the lower center feature surface VI336, and the upper feature surface V345 is attached to the lower center feature surface V335.

[0055] S3. The shaping mold is vulcanized and shaped by applying pressure and heating with a flat vulcanizing machine to obtain a polytetrafluoroethylene film layer composite on the working surface.

[0056] S4. Repeat step S3 until the long strip of polytetrafluoroethylene film layer is evenly covered and bonded to the long strip of airtight ring body to obtain a shaped semi-finished product.

[0057] S5. Trim the shaped semi-finished product obtained in step S4, removing excess polytetrafluoroethylene film layer and adhesive edge.

[0058] S6. The two ends of the shaped semi-finished product obtained in step S5 are cut flat and inserted into the vulcanizing lower mold of the vulcanizing mold. One end of the shaped semi-finished product is first inserted into the vulcanizing docking point 44 of the vulcanizing lower mold, and the other end of the shaped semi-finished product is inserted around the vulcanizing lower mold until it reaches the vulcanizing docking point 44. At this time, one end of the shaped semi-finished product is in contact with the other end and fits together. The vulcanizing middle mold of the vulcanizing mold is attached to the straight edge of the fixed surface of the airtight ring body, and then the vulcanizing upper mold of the vulcanizing mold is closed.

[0059] The specific usage method of the vulcanizing mold is as follows: the vulcanizing feature surface V435 is attached to the arc edge 14 with the polytetrafluoroethylene film layer 2; the vulcanizing feature surface VI436 is attached to the working surface abutment edge 113, working surface transition edge II 115, working surface inclined edge 112, and working surface transition edge I 114 with the polytetrafluoroethylene film layer 2; the vulcanizing feature surface VII437 is attached to the working surface straight edge 111 with the polytetrafluoroethylene film layer 2; and the vulcanizing feature surface VIII438 is attached to the bottom edge 16.

[0060] The sulfur-in-the-middle characteristic surface II 422 is attached to the straight edge 121 of the fixed surface; the sulfur-in-the-middle characteristic surface III 423 is attached to the sulfur-below characteristic surface VIII 438; the sulfur-in-the-middle characteristic surface IV 424 is attached to the sulfur-below characteristic surface IX 439; and the sulfur-in-the-middle characteristic surface V 425 is attached to the sulfur-below characteristic surface X 4310.

[0061] The sulfur upper feature surface VI416 is attached to the groove arc edge 133, the sulfur upper feature surface V415 is attached to the groove inclined edge 132, the sulfur upper feature surface VII417 is attached to the groove straight edge 131, the sulfur upper feature surface IV414 is attached to the sulfur lower feature surface IV434, the sulfur upper feature surface III413 is attached to the sulfur lower feature surface III433, the sulfur upper feature surface II412 is attached to the sulfur lower feature surface II432, the sulfur upper feature surface I411 is attached to the sulfur lower feature surface I431, the sulfur upper feature surface VIII418 is attached to the sulfur middle feature surface VI426, the sulfur upper feature surface IX419 is attached to the sulfur middle feature surface I421, and the sulfur upper feature surface X4110 is attached to the sulfur middle feature surface VII427.

[0062] S7. The vulcanizing mold is pressurized and heated by a flat vulcanizing machine to form a finished circular polytetrafluoroethylene film airtight ring.

[0063] S8. The PTFE film airtight ring obtained in step S7 has only one splicing seam.

[0064] A shaping mold for the production process of a polytetrafluoroethylene film airtight ring includes a lower shaping mold 31, a middle shaping mold I 32, a middle shaping mold II 33, and an upper shaping mold 34. The lower shaping mold 31 is inserted into the airtight ring body 1. The middle shaping mold I 32 fixes the airtight ring body 1 from one side of the working surface 11. The middle shaping mold II 33 fixes the airtight ring body 1 from one side of the groove 13. The upper shaping mold 34 presses the airtight ring body 1.

[0065] Further, the lower mold 31 includes lower feature surface I 311, lower feature surface II 312, lower feature surface III 313, lower feature surface IV 314, lower feature surface V 315, lower feature surface VI 316, and lower feature surface VII 317; the middle mold 32 includes upper center feature surface I 321, upper center feature surface II 322, upper center feature surface III 323, upper center feature surface IV 324, and upper center feature surface V 32. 5; The shaping middle mold II 33 includes a lower center feature surface I 331, a lower center feature surface II 332, a lower center feature surface III 333, a lower center feature surface IV 334, a lower center feature surface V 335, a lower center feature surface VI 336, and a lower center feature surface VII 337; The shaping upper mold 34 includes an upper center feature surface I 341, an upper center feature surface II 342, an upper center feature surface III 343, an upper center feature surface IV 344, and an upper center feature surface V 345.

[0066] The lower feature surface IV314 is used to place the airtight ring body 1, and the lower feature surface IV314 is attached to one side of the straight edge 121 of the fixed surface; the upper center feature surface III323 mates with the straight edge 111 of the working surface and its polytetrafluoroethylene film layer 2, and the lower feature surface III313; the upper center feature surface I321 mates with the lower feature surface I311; the upper center feature surface II322 mates with the lower feature surface II312; the lower center feature surface I331 mates with the arc edge 133 of the groove; the lower center feature surface II332 mates with the straight edge 131 of the groove and the lower feature surface V315; and the lower center feature surface III333 mates with the lower feature surface VI316. The lower centering feature surface IV334 mates with the lower centering feature surface VII317, and the lower centering feature surface VII337 mates with the groove inclined edge 132; the upper centering feature surface I341 mates with the upper centering feature surface V325, the upper centering feature surface II342 mates with the upper centering feature surface IV324, the upper centering feature surface III343 mates with the working surface transition edge I114, the working surface inclined edge 112, the working surface transition edge II115, the working surface abutment edge 113, the arc edge 14, and its polytetrafluoroethylene film layer 2; the upper centering feature surface IV344 mates with the lower centering feature surface VI336, and the upper centering feature surface V345 mates with the lower centering feature surface V335.

[0067] A vulcanizing mold for the production process of a polytetrafluoroethylene (PTFE) film airtight ring includes an upper vulcanizing mold 41, two middle vulcanizing molds 42, and a lower vulcanizing mold 43. The middle vulcanizing molds 42 are semi-circular in shape. The lower vulcanizing mold 43 is used to insert a shaped semi-finished product. One end of the shaped semi-finished product is first inserted into the mating point 44, and the other end is wrapped back to the mating point 44 to fit against one end of the shaped semi-finished product. The two middle vulcanizing molds 42 are respectively inserted from the left and right sides of the lower vulcanizing mold 43 and pressed against the straight edge 121 of the fixed surface. The two middle vulcanizing molds 42 are joined together to form a circle. The upper vulcanizing mold 41 is pressed against the groove 13 from the top of the lower vulcanizing mold 43.

[0068] Further, the vulcanizing upper mold 41 includes sulfur upper characteristic surface I 411, sulfur upper characteristic surface II 412, sulfur upper characteristic surface III 413, sulfur upper characteristic surface IV 414, sulfur upper characteristic surface V 415, sulfur upper characteristic surface VI 416, sulfur upper characteristic surface VII 417, sulfur upper characteristic surface VIII 418, sulfur upper characteristic surface IX 419, and sulfur upper characteristic surface X 4110; the vulcanizing middle mold 42 includes sulfur middle characteristic surface I 421, sulfur middle characteristic surface II 422, and sulfur middle characteristic surface III 4110. 23. Sulfur characteristic surface IV 424, sulfur characteristic surface V 425, sulfur characteristic surface VI 426, sulfur characteristic surface VII 427; the lower vulcanizing mold 43 includes sulfur lower characteristic surface I 431, sulfur lower characteristic surface II 432, sulfur lower characteristic surface III 433, sulfur lower characteristic surface IV 434, sulfur lower characteristic surface V 435, sulfur lower characteristic surface VI 436, sulfur lower characteristic surface VII 437, sulfur lower characteristic surface VIII 438, sulfur lower characteristic surface IX 439, sulfur lower characteristic surface X 4310.

[0069] The under-sulfur feature surface V435 mates with the arc edge 14 with the polytetrafluoroethylene film layer 2; the under-sulfur feature surface VI436 mates with the working surface abutment edge 113, working surface transition edge II 115, working surface inclined edge 112, and working surface transition edge I 114 with the polytetrafluoroethylene film layer 2; the under-sulfur feature surface VII437 mates with the straight edge 111 of the working surface with the polytetrafluoroethylene film layer 2; the under-sulfur feature surface VIII438 mates with the bottom edge 16; the sulfur-in-the-middle feature surface II422 mates with the straight edge 121 of the fixed surface; the sulfur-in-the-middle feature surface III423 mates with the under-sulfur feature surface VIII438; the sulfur-in-the-middle feature surface IV424 mates with the under-sulfur feature surface IX439; and the sulfur-in-the-middle feature surface V425 mates with the under-sulfur feature surface II434. X4310 fits; the sulfur upper feature surface VI416 fits with the groove arc edge 133, the sulfur upper feature surface V415 fits with the groove inclined edge 132, the sulfur upper feature surface VII417 fits with the groove straight edge 131, the sulfur upper feature surface IV414 fits with the sulfur lower feature surface IV434, the sulfur upper feature surface III413 fits with the sulfur lower feature surface III433, the sulfur upper feature surface II412 fits with the sulfur lower feature surface II432, the sulfur upper feature surface I411 fits with the sulfur lower feature surface I431, the sulfur upper feature surface VIII418 fits with the sulfur middle feature surface VI426, the sulfur upper feature surface IX419 fits with the sulfur middle feature surface I421, and the sulfur upper feature surface X4110 fits with the sulfur middle feature surface VII427.

[0070] One side of the fixed surface 12 of the PTFE film airtight ring is bonded to equipment I5, and the other side of the working surface 11 with the PTFE film layer faces equipment II6, so that the PTFE film airtight ring is compressed to achieve a sealing effect. When equipment II6 moves, it comes into contact with the PTFE film layer 2. Since the PTFE film layer 2 has a low surface friction coefficient, it can reduce the resistance to movement and ensure stable operation of the equipment while maintaining airtightness.

[0071] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. Polytetrafluoroethylene film airtight ring, characterized by: It comprises a gas-tight ring body (1), wherein a working surface (11) is formed on one side wall of the gas-tight ring body (1), a fixing surface (12) is formed on the other side wall of the gas-tight ring body (1), and a groove (13) is formed between the fixing surface (12) and the working surface (11); The fixing surface (12) comprises a fixing surface straight edge (121); The working surface (11) comprises a working surface straight edge (111), a working surface transition edge I (114), a working surface bevel edge (112), a working surface transition edge II (115), and a working surface abutting edge (113) which are connected in sequence; The working surface bevel (112) extends obliquely from the connecting end of the working surface transition edge I (114) in a direction away from the fixed surface (12) to connect to the working surface transition edge II (115), and the working surface straight edge (111) and the fixed surface straight edge (121) are connected via a bottom edge (16); The groove (13) comprises a groove straight edge (131), a groove bevel edge (132), and a groove arc edge (133); one end of the groove arc edge (133) is connected to one end of the groove bevel edge (132); the other end of the groove bevel edge (132) is connected to the working surface abutting edge (113) via an arc edge (14); the other end of the groove arc edge (133) is connected to one end of the groove straight edge (131); the other end of the groove straight edge (131) is connected to the fixing surface straight edge (121) via a straight edge (15); A polytetrafluoroethylene film layer (2) is provided on the working surface (11).

2. The polytetrafluoroethylene film airtight ring according to claim 1, characterized in that: One end of the polytetrafluoroethylene film layer (2) is aligned with the bottom edge (16), and the other end of the polytetrafluoroethylene film layer (2) extends to the connection between the arc edge (14) and the groove bevel edge (132).

3. The polytetrafluoroethylene film airtight ring according to claim 1, characterized in that: The highest point in the center of the arc edge (14) is lower than the straight edge (15).

4. Molding mold for polytetrafluoroethylene film airtight ring, characterized by: It comprises a shaping lower die (31), a shaping middle die I (32), a shaping middle die II (33), and a shaping upper die (34); The shaping lower mold (31) is loaded with the airtight ring body (1), the shaping middle mold I (32) fixes the airtight ring body (1) from the side of the working surface (11), the shaping middle mold II (33) fixes the airtight ring body (1) from the side of the groove (13), and the shaping upper mold (34) presses the airtight ring body (1).

5. The shaping mold for the polytetrafluoroethylene film airtight ring according to claim 4, characterized in that: The lower shaping mold (31) comprises a lower shaping characteristic surface I (311), a lower shaping characteristic surface II (312), a lower shaping characteristic surface III (313), a lower shaping characteristic surface IV (314), a lower shaping characteristic surface V (315), a lower shaping characteristic surface VI (316), and a lower shaping characteristic surface VII (317); The shaping middle mold I (32) comprises a centering upper characteristic surface I (321), a centering upper characteristic surface II (322), a centering upper characteristic surface III (323), a centering upper characteristic surface IV (324), and a centering upper characteristic surface V (325); The shaping middle mold II (33) comprises a lower characteristic surface I (331), a lower characteristic surface II (332), a lower characteristic surface III (333), a lower characteristic surface IV (334), a lower characteristic surface V (335), a lower characteristic surface VI (336), and a lower characteristic surface VII (337); The shaping upper mold (34) comprises a shaping upper characteristic surface I (341), a shaping upper characteristic surface II (342), a shaping upper characteristic surface III (343), a shaping upper characteristic surface IV (344), and a shaping upper characteristic surface V (345).

6. The shaping mold for the polytetrafluoroethylene film airtight ring according to claim 5, characterized in that: The airtight ring body (1) is placed on the lower characteristic surface IV (314), and one side of the straight edge (121) of the fixed surface is in contact with the lower characteristic surface IV (314); The centering upper characteristic surface III (323) cooperates with the straight edge (111) of the working surface and its polytetrafluoroethylene film layer (2), and the lower characteristic surface III (313); the centering upper characteristic surface I (321) cooperates with the lower characteristic surface I (311); and the centering upper characteristic surface II (322) cooperates with the lower characteristic surface II (312); The lower centering characteristic surface I (331) cooperates with the arc edge (133) of the groove, the lower centering characteristic surface II (332) cooperates with the straight edge (131) of the groove and the lower centering characteristic surface V (315), the lower centering characteristic surface III (333) cooperates with the lower centering characteristic surface VI (316), the lower centering characteristic surface IV (334) cooperates with the lower centering characteristic surface VII (317), and the lower centering characteristic surface VII (337) cooperates with the oblique edge (132) of the groove; The upper fixing characteristic surface I (341) cooperates with the upper fixing characteristic surface V (325), the upper fixing characteristic surface II (342) cooperates with the upper fixing characteristic surface IV (324), the upper fixing characteristic surface III (343) cooperates with the working surface transition edge I (114), the working surface bevel edge (112), the working surface transition edge II (115), the working surface abutment edge (113), the arc edge (14) and its polytetrafluoroethylene film layer (2), the upper fixing characteristic surface IV (344) cooperates with the lower fixing characteristic surface VI (336), and the upper fixing characteristic surface V (345) cooperates with the lower fixing characteristic surface V (335).

7. Vulcanization mold for polytetrafluoroethylene film airtight ring, characterized by: It comprises a vulcanization upper mold (41), two vulcanization middle molds (42), and a vulcanization lower mold (43); The vulcanization middle mold (42) is semicircular in shape; The vulcanization lower mold (43) is loaded with the shaped semi-finished product, one end of the shaped semi-finished product is first loaded into the docking point (44), and the other end is looped back to the docking point (44) to fit with one end of the shaped semi-finished product, the two vulcanization middle molds (42) are respectively inserted from the left and right sides of the vulcanization lower mold (43) and pressed against the straight edge (121) of the fixed surface, and the two vulcanization middle molds (42) are docked into a circle, and the vulcanization upper mold (41) is pressed against the groove (13) from the top of the vulcanization lower mold (43).

8. The vulcanization mold for the polytetrafluoroethylene film airtight ring according to claim 7, characterized in that: The vulcanization upper mold (41) includes a sulfur characteristic surface Ⅰ (411), a sulfur characteristic surface Ⅱ (412), a sulfur characteristic surface Ⅲ (413), a sulfur characteristic surface Ⅳ (414), a sulfur characteristic surface Ⅴ (415), a sulfur characteristic surface Ⅵ (416), a sulfur characteristic surface Ⅶ (417), a sulfur characteristic surface Ⅷ (418), a sulfur characteristic surface Ⅸ (419), and a sulfur characteristic surface Ⅹ (4110); The vulcanization middle mold (42) includes a sulfur middle characteristic surface I (421), a sulfur middle characteristic surface II (422), a sulfur middle characteristic surface III (423), a sulfur middle characteristic surface IV (424), a sulfur middle characteristic surface V (425), a sulfur middle characteristic surface VI (426), and a sulfur middle characteristic surface VII (427); The vulcanization lower mold (43) includes a sulfur lower characteristic surface I (431), a sulfur lower characteristic surface II (432), a sulfur lower characteristic surface III (433), a sulfur lower characteristic surface IV (434), a sulfur lower characteristic surface V (435), a sulfur lower characteristic surface VI (436), a sulfur lower characteristic surface VII (437), a sulfur lower characteristic surface VIII (438), a sulfur lower characteristic surface IX (439), and a sulfur lower characteristic surface X (4310).

9. The vulcanization mold for the polytetrafluoroethylene film airtight ring according to claim 8, characterized in that: The sulfur lower characteristic surface V (435) cooperates with the arc edge (14) of the polytetrafluoroethylene film layer (2), the sulfur lower characteristic surface VI (436) cooperates with the working surface abutting edge (113), the working surface transition edge II (115), the working surface bevel edge (112), and the working surface transition edge I (114) of the polytetrafluoroethylene film layer (2), the sulfur lower characteristic surface VII (437) cooperates with the working surface straight edge (111) of the polytetrafluoroethylene film layer (2), and the sulfur lower characteristic surface VIII (438) cooperates with the bottom edge (16); The characteristic surface II (422) in the sulfur cooperates with the straight edge (121) of the fixed surface, the characteristic surface III (423) in the sulfur cooperates with the characteristic surface VIII (438) under the sulfur, the characteristic surface IV (424) in the sulfur cooperates with the characteristic surface IX (439) under the sulfur, and the characteristic surface V (425) in the sulfur cooperates with the characteristic surface X (4310) under the sulfur; The sulfur upper characteristic surface VI (416) cooperates with the groove arc edge (133), the sulfur upper characteristic surface V (415) cooperates with the groove bevel edge (132), the sulfur upper characteristic surface VII (417) cooperates with the groove straight edge (131), the sulfur upper characteristic surface IV (414) cooperates with the sulfur lower characteristic surface IV (434), the sulfur upper characteristic surface III (413) cooperates with the sulfur lower characteristic surface III (433), and the sulfur The upper characteristic surface II (412) cooperates with the lower characteristic surface II (432) of sulfur, the upper characteristic surface I (411) of sulfur cooperates with the lower characteristic surface I (431) of sulfur, the upper characteristic surface VIII (418) of sulfur cooperates with the middle characteristic surface VI (426) of sulfur, the upper characteristic surface IX (419) of sulfur cooperates with the middle characteristic surface I (421) of sulfur, and the upper characteristic surface X (4110) of sulfur cooperates with the middle characteristic surface VII (427) of sulfur.

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