Polytetrafluoroethylene isostatic molding apparatus

Abstract

The present application relates to the technical field of pipeline lining, and particularly relates to a polytetrafluoroethylene isobaric forming equipment. The polytetrafluoroethylene isobaric forming equipment comprises a tubular outer membrane, a tubular inner membrane, a rubber soft membrane, two adjusting mechanisms, a plurality of first reset mechanisms and second reset mechanisms. The tubular outer membrane is sleeved on the tubular inner membrane. The adjusting mechanism comprises a shell, a fixed plate, a connecting piece, a piston plate, a pressing plate assembly and a blocking ring assembly. The pressing plate assembly comprises a first pressing plate, a second pressing plate and a third pressing plate. The blocking ring assembly comprises a rubber blocking ring and a plurality of fixed steel needles. The first reset mechanism is used for promoting and delaying the reset of the piston plate, and the second reset mechanism is used for resetting the connecting piece. The present application provides a polytetrafluoroethylene isobaric forming equipment to solve the problem that in the prior art, the rubber soft membrane is fixed between the outer membrane and the inner membrane to place powder, and is repeatedly compressed, the contact part of the rubber soft membrane and the pressing plate is repeatedly bent, and is finally damaged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline lining, in particular to a polytetrafluoroethylene isobaric forming equipment. BACKGROUND

[0002] Pipeline lining is a kind of pipeline skeleton with steel or hard structure outside, and lining rubber with wear resistance, corrosion resistance and high temperature resistance as lining layer. Through the physical and chemical properties of rubber, the effect of pipeline conveying medium on the external structure such as impact force and corrosion is reduced. Due to the buffering effect of rubber, the service life of pipeline is greatly prolonged, and the cost of users is reduced. Since polytetrafluoroethylene has the characteristics of acid and alkali resistance, resistance to various organic solvents, and almost insoluble in all solvents. At the same time, polytetrafluoroethylene has the characteristics of high temperature resistance, and its friction coefficient is very low, so it can be used as lubrication, and also becomes an ideal coating for easy cleaning wok and water pipe inner layer. Therefore, lining polytetrafluoroethylene is more popular, especially in organic silicon, aniline and other projects. The existing polytetrafluoroethylene lined pipeline generally adopts isobaric process, that is, the pipeline steel shell itself is used as part of the lining mold during production.

[0003] Patent 201210075199.5 discloses a polytetrafluoroethylene isostatic forming device and a pipeline lining method using the device. The mold is placed in the high pressure cabin liquid surface of the isostatic pressing machine, the high pressure cabin is pressurized to the process pressure, and the polytetrafluoroethylene blank is cold pressed to form, that is, the isostatic pressing process is adopted. After sintering and drawing of the ejection blank, it is placed into the pipeline, and after heating, the polytetrafluoroethylene pipe blank rebounds, so that the polytetrafluoroethylene pipe is tightly lined in the pipeline. The lining has good high temperature and high pressure resistance, and meets the full vacuum use requirement under the condition of 232 DEG C high temperature. The structure of the present application has the advantages of the above-mentioned patent, but when the isobaric process is used for production, the rubber soft film is fixed between the outer film and the inner film to place the powder, and is repeatedly compressed. The contact part of the rubber soft film and the pressing plate is repeatedly bent and finally damaged. SUMMARY

[0004] The present application provides a polytetrafluoroethylene isobaric forming equipment to solve the problem that in the existing technology, the rubber soft film is fixed between the outer film and the inner film to place the powder, and is repeatedly compressed. The contact part of the rubber soft film and the pressing plate is repeatedly bent and finally damaged.

[0005] The polytetrafluoroethylene isobaric forming equipment of the present application adopts the following technical scheme: a polytetrafluoroethylene isobaric forming equipment includes a tubular outer film, a tubular inner film, a rubber soft film, two adjusting mechanisms, a plurality of first reset mechanisms and second reset mechanisms. The tubular inner film is vertically arranged, and a plurality of transverse grooves are arranged on the tubular inner film. The tubular outer film is sleeved on the tubular inner film, a plurality of first through holes are formed on the tubular outer film, and the rubber soft film is flatly attached to the inner wall surface of the tubular outer film.

[0006] Two adjusting mechanisms are respectively arranged at upper and lower ends of the tubular outer membrane. The adjusting mechanism comprises a shell, a fixed plate, a connecting piece, a piston plate, a pressing plate assembly and a blocking ring assembly. The shell is provided with a first cavity and a second cavity, and the second cavity is concentrically arranged in the shell. The fixed plate is fixedly arranged at one end of the shell. The connecting piece comprises a baffle part and a connecting rod part, the baffle part is vertically arranged in the first cavity, the baffle part is provided with a blocking ring, the outer peripheral wall of the blocking ring is provided with a ring groove, and the connecting rod part is slidably arranged in the second cavity. The piston plate is slidably arranged in the first cavity, and the piston plate is provided with a stopper, and the stopper is slidably arranged in the ring groove.

[0007] The pressing plate assembly comprises a first pressing plate, a second pressing plate and a third pressing plate. One end of the first pressing plate is fixedly arranged on the piston plate, and the other end of the first pressing plate is provided with a first inclined surface. One end of the second pressing plate is fixedly arranged on the baffle part of the connecting piece, and the other end of the second pressing plate is provided with a second inclined surface. One end of the third pressing plate is fixedly arranged on the fixed plate, and the other end of the third pressing plate is provided with a third inclined surface. The inner peripheral wall of the first pressing plate is in abutment with the outer peripheral wall of the second pressing plate, and the inner peripheral wall of the second pressing plate is in abutment with the outer peripheral wall of the third pressing plate. In the initial state, the top ends of the first inclined surface, the second inclined surface and the third inclined surface are at the same horizontal height.

[0008] The blocking ring assembly comprises a rubber blocking ring and a plurality of fixed steel needles. The rubber blocking ring is sleeved on the tubular inner membrane, and the rubber blocking ring is provided with a fourth inclined surface on the peripheral wall. In the initial state, the rubber blocking ring is in a stretched state, and the inclined surface of the fourth inclined surface is in abutment with the first inclined surface. The plurality of fixed steel needles are uniformly arranged, one end of each fixed steel needle is fixedly arranged on the inner peripheral wall of the rubber blocking ring, and the other end of each fixed steel needle is slidably arranged in the horizontal groove. The first reset mechanism is used to promote and delay the reset of the piston plate, and the second reset mechanism is used to reset the connecting piece.

[0009] Further, the first reset mechanism comprises a damping cylinder, a damping rod and two first springs. The damping cylinder is vertically arranged in the first cavity, the damping rod is slidably arranged in the damping cylinder, one end of the damping rod is fixedly connected to the piston plate, and a damping plate is fixedly arranged on the damping rod. The first spring is arranged in the damping cylinder, and the two first springs are arranged on both sides of the damping plate.

[0010] Further, the second reset mechanism comprises a second spring, and the second spring is sleeved on the connecting rod part.

[0011] Further, the adjusting mechanism further comprises a first sealing ring, the first sealing ring is sleeved on the piston plate, and the outer peripheral wall of the first sealing ring is in abutment with the inner peripheral wall of the shell.

[0012] Further, the first inclined surface gradually inclines outward from one end of the first pressing plate to the middle of the first pressing plate. The second inclined surface gradually inclines outward from one end of the second pressing plate to the middle of the second pressing plate. The third inclined surface gradually inclines outward from one end of the third pressing plate to the middle of the third pressing plate. The fourth inclined surface gradually inclines inward from the edge of the piston plate to the center of the piston plate.

[0013] Further, the width of the fourth inclined surface is greater than the first inclined surface, the second inclined surface and the third inclined surface respectively.

[0014] Further, the piston plate is provided with a plurality of mounting holes, the first pressing plate is provided with a plurality of connecting rods, the fixed plate is provided with a plurality of second through holes, and the connecting rods are arranged in the mounting holes through the second through holes.

[0015] Further, the adjusting mechanism further comprises a second sealing ring and a plurality of sealing plates. The second sealing ring is arranged in the fixed plate and blocks the plurality of second through holes. The first sealing ring is provided with a plurality of through holes, the connecting rods pass through the second through holes and the through holes. The sealing plates are arranged at each through hole to block the through hole.

[0016] Further, the two ends of the tubular outer membrane are provided with connecting plates, and the connecting plates are provided with a plurality of threaded holes. The fixed plate is provided with a plurality of threaded holes, and the connecting plates and the fixed plate are fixed by bolts.

[0017] Further, the shell is provided with a positioning ring, and the outer peripheral wall of the positioning ring abuts against the inner peripheral wall of the tubular inner membrane.

[0018] The beneficial effects of the present application are that the first inclined surface, the second inclined surface and the third inclined surface of the first pressing plate, the second pressing plate and the third pressing plate of the polytetrafluoroethylene isochoric forming equipment are finally on the same inclined surface, which avoids the rubber soft membrane being bent by 90° after being compressed each time and improves the fatigue life of the rubber soft membrane.

[0019] The blocking ring assembly can eliminate the burrs after the powder is compressed, prevent the rubber soft membrane from being embedded in the narrow space formed by the first pressing plate, the second pressing plate and the third pressing plate, and prevent the rubber soft membrane from being worn by contacting the sharp edges of the first pressing plate, the second pressing plate and the third pressing plate, thereby further protecting the rubber soft membrane. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1Structure diagram of an embodiment of the polytetrafluoroethylene isostatic forming equipment of the present application.

[0022] Figure 2 Sectional view of an embodiment of the polytetrafluoroethylene isostatic forming equipment of the present application in an initial state.

[0023] Figure 3 Structure diagram of a piston plate of an embodiment of the polytetrafluoroethylene isostatic forming equipment of the present application. Figure 2 Enlarged view of the middle A.

[0024] Figure 4 Sectional view of an embodiment of the polytetrafluoroethylene isostatic forming equipment of the present application in a final state.

[0025] Figure 5 Structure diagram of a connecting piece of an embodiment of the polytetrafluoroethylene isostatic forming equipment of the present application. Figure 4 Enlarged view of the middle B.

[0026] Figure 6 Top view of an embodiment of the polytetrafluoroethylene isostatic forming equipment of the present application.

[0027] Figure 7 Structure diagram of a connecting piece of an embodiment of the polytetrafluoroethylene isostatic forming equipment of the present application. Figure 6 Sectional view of the middle C-C.

[0028] Figure 8 Exploded view of part of the structure of an embodiment of the polytetrafluoroethylene isostatic forming equipment of the present application.

[0029] Figure 9 Structure diagram of a piston plate of an embodiment of the polytetrafluoroethylene isostatic forming equipment of the present application.

[0030] Figure 10 Top view of a piston plate of an embodiment of the polytetrafluoroethylene isostatic forming equipment of the present application.

[0031] Figure 11 Structure diagram of a connecting piece of an embodiment of the polytetrafluoroethylene isostatic forming equipment of the present application. Figure 10 Sectional view of the middle D-D.

[0032] Figure 12 Structure diagram of a connecting piece of an embodiment of the polytetrafluoroethylene isostatic forming equipment of the present application.

[0033] Figure 13 Structure diagram of a housing of an embodiment of the polytetrafluoroethylene isostatic forming equipment of the present application.

[0034] Figure 14 Sectional view of a housing of an embodiment of the polytetrafluoroethylene isostatic forming equipment of the present application.

[0035] Figure 15 Structure diagram of a rubber blocking ring of an embodiment of the polytetrafluoroethylene isostatic forming equipment of the present application.

[0036] Figure 16 This is a cross-sectional view of a rubber retaining ring according to an embodiment of a polytetrafluoroethylene isobaric molding apparatus of the present invention.

[0037] In the diagram: 110, tubular outer membrane; 120, tubular inner membrane; 130, rubber diaphragm; 140, retaining ring assembly; 141, rubber retaining ring; 142, fixing steel pin; 210, pressure plate assembly; 211, first pressure plate; 212, second pressure plate; 213, third pressure plate; 220, housing; 221, positioning ring; 231, fixing plate; 232, second sealing ring; 233, sealing plate; 241, piston plate; 242, first sealing ring; 243, mounting hole; 250, first reset mechanism; 251, damping rod; 252, damping cylinder; 253, first spring; 260, second reset mechanism; 261, connecting piece; 262, second spring. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] An embodiment of the polytetrafluoroethylene isobaric molding equipment of the present invention, such as... Figures 1 to 16 As shown, a polytetrafluoroethylene (PTFE) isobaric molding apparatus includes a tubular outer membrane 110, a tubular inner membrane 120, a rubber membrane 130, two adjusting mechanisms, and multiple first reset mechanisms 250 and second reset mechanisms 260. The tubular inner membrane 120 is vertically arranged and has multiple transverse grooves. The tubular outer membrane 110 is fitted onto the tubular inner membrane 120, and the tubular outer membrane 110 has multiple first through holes. The rubber membrane 130 is flatly attached to the inner wall surface of the tubular outer membrane 110. There is a gap between the rubber membrane 130 and the tubular inner membrane 120.

[0040] Two adjusting mechanisms are respectively located at the upper and lower ends of the tubular outer membrane 110. Each adjusting mechanism includes a housing 220, a fixing plate 231, a connecting member 261, a piston plate 241, a pressure plate assembly 210, and a retaining ring assembly 140. The housing 220 contains a first cavity and a second cavity, the second cavity being concentrically arranged with the housing 220. The fixing plate 231 is fixedly disposed at one end of the housing 220. The connecting member 261 includes a baffle portion and a connecting rod portion. The baffle portion is vertically disposed within the first cavity, and a retaining ring is provided on the baffle portion. An annular groove is provided on the outer peripheral wall of the retaining ring. The connecting rod portion is slidably disposed within the second cavity. The piston plate 241 is slidably disposed within the first cavity, and a stop block is provided on the piston plate 241, the stop block being slidably disposed within the annular groove.

[0041] The pressing plate assembly 210 comprises a first pressing plate 211, a second pressing plate 212 and a third pressing plate 213. One end of the first pressing plate 211 is fixedly arranged on the piston plate 241, and the other end of the first pressing plate 211 is provided with a first inclined surface. One end of the second pressing plate 212 is fixedly arranged on the baffle part of the connecting piece 261, and the other end of the second pressing plate 212 is provided with a second inclined surface. One end of the third pressing plate 213 is fixedly arranged on the fixed plate 231, and the other end of the third pressing plate 213 is provided with a third inclined surface. The inner circumferential wall of the first pressing plate 211 abuts against the outer circumferential wall of the second pressing plate 212, and the inner circumferential wall of the second pressing plate 212 abuts against the outer circumferential wall of the third pressing plate 213. In the initial state, the top ends of the first inclined surface, the second inclined surface and the third inclined surface are at the same horizontal height.

[0042] The blocking ring assembly 140 comprises a rubber blocking ring 141 and a plurality of fixed steel needles 142. The rubber blocking ring 141 is sleeved on the tubular inner film 120, and a fourth inclined surface is arranged on the circumferential wall of the rubber blocking ring 141. In the initial state, the rubber blocking ring 141 is in a stretched state, and the inclined surface of the fourth inclined surface abuts against the first inclined surface. The plurality of fixed steel needles 142 are uniformly arranged, one end of each fixed steel needle 142 is fixedly arranged on the inner circumferential wall of the rubber blocking ring 141, and the other end of each fixed steel needle 142 is slidably arranged in the horizontal groove. The first reset mechanism 250 is used to promote and delay the reset of the piston plate 241, and the second reset mechanism 260 is used to reset the connecting piece 261.

[0043] In the embodiment, as shown in Figure 3 The first reset mechanism 250 comprises a damping cylinder 252, a damping rod 251 and two first springs 253. The damping cylinder 252 is vertically arranged in the first cavity, the damping cylinder 252 contains damping liquid, the damping rod 251 is slidably arranged in the damping cylinder 252, one end of the damping rod 251 is fixedly connected to the piston plate 241, a damping plate is fixedly arranged on the damping rod 251, and the first springs 253 are arranged in the damping cylinder 252 and arranged on both sides of the damping plate. When the first springs 253 are to recover the deformation, the first springs 253 recover the deformation at a slower speed due to the damping liquid in the damping cylinder 252, so that the piston plate 241 is slowly reset.

[0044] In the embodiment, as shown in Figure 7 The second reset mechanism 260 comprises a second spring 262, and the second spring 262 is sleeved on the connecting rod part. Under the action of the second spring 262, the connecting piece 261 moves upward or downward, and drives the second pressing plate 212 to move upward or downward.

[0045] In the embodiment, as shown in Figure 7As shown, the adjusting mechanism further comprises a first sealing ring 242, which is sleeved on the piston plate 241, and the outer peripheral wall of the first sealing ring 242 abuts against the inner peripheral wall of the second cavity. The piston plate 241 and the shell 220 form a sealed space for the first cavity due to the effect of the first sealing ring 242.

[0046] In the embodiment, as shown in Figure 3 and Figure 5 , the first inclined surface gradually inclines outward along one end of the first pressing plate 211 to the middle part of the first pressing plate 211. The second inclined surface gradually inclines outward along one end of the second pressing plate 212 to the middle part of the second pressing plate 212. The third inclined surface gradually inclines outward along one end of the third pressing plate 213 to the middle part of the third pressing plate 213. The fourth inclined surface gradually inclines inward along the edge of the piston plate 241 to the center of the piston plate 241. In the initial state, the top ends of the first inclined surface, the second inclined surface and the third inclined surface are on the same horizontal plane, and in the final state, the first inclined surface, the second inclined surface and the third inclined surface are on the same inclined plane.

[0047] In the embodiment, as shown in Figure 3 and Figure 5 , the width of the fourth inclined surface is greater than that of the first inclined surface, the second inclined surface and the third inclined surface, and the fourth inclined surface is always in contact with the first inclined surface and the second inclined surface or the second inclined surface and the third inclined surface at the same time.

[0048] In the embodiment, as shown in Figure 11 , the piston plate 241 is provided with a plurality of mounting holes 243, the first pressing plate 211 is provided with a plurality of connecting rods, the fixed plate 231 is provided with a plurality of second through holes, and the connecting rods are arranged in the mounting holes 243 through the second through holes. The first pressing plate 211 is fixedly connected with the piston plate 241 through the connecting rods.

[0049] In the embodiment, as shown in Figure 7 , the adjusting mechanism further comprises a second sealing ring 232 and a plurality of sealing plates 233, the second sealing ring 232 is arranged in the fixed plate 231 and blocks the plurality of second through holes. The second sealing ring 232 is provided with a plurality of through holes, the connecting rods pass through the second through holes and the through holes, and the sealing plates 233 are arranged at each through hole to block the through holes.

[0050] In the embodiment, as shown in Figure 2 , the two ends of the tubular outer membrane 110 are provided with connecting plates, and the connecting plates are provided with a plurality of threaded holes. The fixed plate 231 is provided with a plurality of threaded holes, and the connecting plates and the fixed plate 231 are fixedly connected through bolts. The shell 220 is provided with a plurality of threaded holes, and the shell 220 and the fixed plate 231 are fixedly connected through bolts.

[0051] In the embodiment, as shown in Figure 13As shown, the shell 220 is provided with a positioning ring 221, and the outer peripheral wall of the positioning ring 221 abuts against the inner peripheral wall of the tubular inner film 120. The positioning ring 221 defines the position of the tubular inner film 120.

[0052] Working process: the powder is filled into the gap between the tubular inner film 120 and the rubber soft film 130, and then the connecting plate fixing plate 231 is fixed and connected by bolts. After the device is assembled, the device is placed into an isostatic machine.

[0053] The adjusting mechanism at the lower end, due to the action of the first sealing ring 242, makes the piston plate 241 and the shell 220 seal the first cavity to form a sealed space, and the pressure outside the piston plate 241 is greater than the pressure inside the sealed space. Under the action of the pressure, the piston plate 241 moves downward and compresses the air in the sealed space, and drives the first pressing plate 211 to move downward. The damping rod 251 moves downward, so that the damping plate compresses the first spring 253. Since the fourth inclined surface abuts against the first inclined surface in the initial state, the first pressing plate 211 moves downward, so that the rubber blocking ring 141 gradually shrinks inward. After the piston plate 241 moves downward by a distance, the stop block cooperates with the ring groove, drives the connecting piece 261 to move downward, and compresses the second spring 262. After the connecting piece 261 drives the second pressing plate 212 to move downward by a distance and stops, the inclined surfaces of the first inclined surface, the second inclined surface, the third inclined surface and the fourth inclined surface are at the same inclined surface, and the fourth inclined surface abuts against the second inclined surface and the third inclined surface. At this time, the rubber soft film 130 is compressed to the state as shown, and the angle of the rubber soft film 130 deflected to the tubular inner film 120 is less than 90°, so that the angle of the bending part of the rubber soft film 130 is greater than 90°. The device is taken out of the isostatic machine, and the air in the sealed space formed by the first cavity is compressed, so that the internal pressure of the sealed space is greater than the external pressure. Under the action of the pressure and the first spring 253, the piston plate 241 moves upward, and drives the first pressing plate 211 to move upward. Under the action of the recovery of the second spring 262, the connecting piece 261 moves upward, and drives the second pressing plate 212 to move upward. Since there is damping liquid in the damping cylinder 252, the recovery speed of the first spring 253 is slower than the recovery speed of the second spring 262, and under the cooperation of the ring groove, the second spring 262 quickly recovers to drive the connecting piece 261 to move upward. The connecting piece 261 drives the piston plate 241 to move upward, so that the first pressing plate 211 and the second pressing plate 212 can synchronously move upward by a distance, and the rubber blocking ring 141 is stretched outward by a distance, so that the fourth inclined surface comes to the first inclined surface. After the connecting piece 261 is reset, the first pressing plate 211 continues to move upward by a distance under the action of the first spring 253, and the rubber blocking ring 141 is stretched outward by a distance again, so that it is reset. Figure 5

[0054] ​The adjusting mechanism of the upper end, due to the action of the first sealing ring 242, makes the piston plate 241 and the shell 220 seal the first cavity to form a sealed space, and the pressure outside the piston plate 241 is greater than the pressure inside the sealed space. Under the action of the pressure, the piston plate 241 moves upward and compresses the air in the sealed space, and drives the first pressing plate 211 to move upward. The damping rod 251 moves upward, so that the damping plate compresses the first spring 253. Since the fourth inclined surface is in abutment with the first inclined surface in the initial state, the upward movement of the first pressing plate 211 causes the rubber blocking ring 141 to gradually shrink inward. After the piston plate 241 moves upward by a distance, the stop block cooperates with the ring groove, drives the connecting piece 261 to move upward, and compresses the second spring 262. After the connecting piece 261 drives the second pressing plate 212 to move upward by a distance, the inclined surfaces of the first inclined surface, the second inclined surface, the third inclined surface and the fourth inclined surface are in the same inclined surface, and the fourth inclined surface is in abutment with the second inclined surface and the third inclined surface. When the device is taken out of the isostatic pressing machine, the air in the sealed space formed by the first cavity is compressed, and the internal pressure of the sealed space is greater than the external pressure. Under the action of the pressure and the first spring 253, the piston plate 241 moves downward, and drives the first pressing plate 211 to move downward. Under the action of the recovery of the deformation of the second spring 262, the connecting piece 261 moves downward, and drives the second pressing plate 212 to move downward. Due to the damping liquid in the damping cylinder 252, the recovery speed of the first spring 253 is slower than the recovery speed of the second spring 262, and under the cooperation of the ring groove, the second spring 262 quickly recovers the deformation to drive the connecting piece 261 to move downward. The connecting piece 261 drives the piston plate 241 to move downward, so that the first pressing plate 211 and the second pressing plate 212 can move downward by a distance synchronously, stretch the rubber blocking ring 141 outward by a distance, and make the fourth inclined surface come to the first inclined surface. After the connecting piece 261 is reset, the first pressing plate 211 continues to move downward by a distance alone under the action of the first spring 253, stretches the rubber blocking ring 141 outward by a distance again, and resets it.

[0055] The blocking ring assembly 140 can eliminate the burrs of the powder after compression, and also prevent the rubber soft film 130 from being embedded in the narrow space formed by the first pressing plate 211, the second pressing plate 212 and the third pressing plate 213, and contacting the sharp edges of the first pressing plate 211, the second pressing plate 212 and the third pressing plate 213 to cause wear of the rubber soft film 130, and further protect the rubber soft film 130. The first inclined surface, the second inclined surface and the third inclined surface are finally in the same inclined surface, which avoids the rubber soft film 130 being bent by 90 degrees after being compressed each time, and improves the fatigue life of the rubber soft film 130.

[0056] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A polytetrafluoroethylene isobaric molding equipment, characterized in that: It includes a tubular outer membrane, a tubular inner membrane, a rubber soft membrane, two adjustment mechanisms, and multiple first reset mechanisms and second reset mechanisms; the tubular inner membrane is vertically arranged and has multiple transverse grooves; the tubular outer membrane is fitted onto the tubular inner membrane and has multiple first through holes; the rubber soft membrane is flat against the inner wall surface of the tubular outer membrane. Two adjustment mechanisms are respectively located at the upper and lower ends of the tubular outer membrane; the adjustment mechanism includes a housing, a fixing plate, a connecting member, a piston plate, a pressure plate assembly, and a retaining ring assembly; the housing has a first cavity and a second cavity, the second cavity being concentrically arranged with the housing; the fixing plate is fixedly arranged at one end of the housing; the connecting member includes a baffle portion and a connecting rod portion, the baffle portion being vertically arranged in the first cavity, a retaining ring being provided on the baffle portion, and an annular groove being provided on the outer peripheral wall of the retaining ring; the connecting rod portion is slidably arranged in the second cavity; the piston plate is slidably arranged in the first cavity, and a stop block is provided on the piston plate, the stop block being slidably arranged in the annular groove; The pressure plate assembly includes a first pressure plate, a second pressure plate, and a third pressure plate; one end of the first pressure plate is fixedly mounted on the piston plate, and the other end of the first pressure plate is provided with a first inclined surface; one end of the second pressure plate is fixedly mounted on the baffle portion of the connector, and the other end of the second pressure plate is provided with a second inclined surface; one end of the third pressure plate is fixedly mounted on the fixing plate, and the other end of the third pressure plate is provided with a third inclined surface; the inner peripheral wall of the first pressure plate abuts against the outer peripheral wall of the second pressure plate, and the inner peripheral wall of the second pressure plate abuts against the outer peripheral wall of the third pressure plate; in the initial state, the tops of the first, second, and third inclined surfaces are at the same horizontal height; The retaining ring assembly includes a rubber retaining ring and multiple fixed steel pins; the rubber retaining ring is sleeved on the tubular inner membrane, and a fourth inclined surface is provided on the peripheral wall of the rubber retaining ring; in the initial state, the rubber retaining ring is in a stretched state, and the inclined surface of the fourth inclined surface abuts against the first inclined surface; the multiple fixed steel pins are evenly arranged, one end of each fixed steel pin is fixedly set on the inner peripheral wall of the rubber retaining ring, and the other end of each fixed steel pin is slidably set in the transverse groove; the first reset mechanism is used to promote and delay the reset of the piston plate, and the second reset mechanism is used to reset the connecting piece.

2. The polytetrafluoroethylene isobaric molding equipment according to claim 1, characterized in that: The first reset mechanism includes a damping cylinder, a damping rod, and two first springs. The damping cylinder is vertically disposed in the first cavity, and the damping rod is slidably disposed in the damping cylinder. One end of the damping rod is fixedly connected to a piston plate, and a damping plate is fixedly disposed on the damping rod. The first springs are disposed in the damping cylinder, and the two first springs are disposed on both sides of the damping plate.

3. The polytetrafluoroethylene isobaric molding equipment according to claim 1, characterized in that: The second reset mechanism includes a second spring, which is sleeved on the connecting rod.

4. The polytetrafluoroethylene isobaric molding equipment according to claim 1, characterized in that: The adjusting mechanism also includes a first sealing ring, which is sleeved on the piston plate, and the outer peripheral wall of the first sealing ring abuts against the inner peripheral wall of the housing.

5. The polytetrafluoroethylene isobaric molding equipment according to claim 1, characterized in that: The first inclined surface gradually slopes outward from one end of the first pressure plate to the middle of the first pressure plate; the second inclined surface gradually slopes outward from one end of the second pressure plate to the middle of the second pressure plate; the third inclined surface gradually slopes outward from one end of the third pressure plate to the middle of the third pressure plate; and the fourth inclined surface gradually slopes inward from the edge of the piston plate to the center of the piston plate.

6. The polytetrafluoroethylene isobaric molding equipment according to claim 5, characterized in that: The width of the fourth inclined plane is greater than that of the first, second, and third inclined planes, respectively.

7. The polytetrafluoroethylene isobaric molding equipment according to claim 1, characterized in that: The piston plate is provided with multiple mounting holes, the first pressure plate is provided with multiple connecting rods, and the fixing plate is provided with multiple second through holes. The connecting rods pass through the second through holes and are installed in the mounting holes.

8. The polytetrafluoroethylene isobaric molding equipment according to claim 7, characterized in that: The adjustment mechanism also includes a second sealing ring and multiple sealing plates. The second sealing ring is located inside the fixed plate and blocks multiple second through holes. The first sealing ring has multiple through holes, through which the connecting rod passes. The sealing plate is located at each through hole to block the through hole.

9. The polytetrafluoroethylene isobaric molding equipment according to claim 1, characterized in that: The tubular outer membrane has connecting plates at both ends, each with multiple threaded holes; the fixing plate has multiple threaded holes, and the connecting plates and fixing plates are fixed together by bolts.

10. The polytetrafluoroethylene isobaric molding equipment according to claim 1, characterized in that: A positioning ring is provided on the shell, and the outer peripheral wall of the positioning ring abuts against the inner peripheral wall of the tubular inner membrane.

Images