CN111776289A - Port sealing structure for stainless steel pipe and use method thereof - Google Patents

Abstract

The invention relates to the field of pipe fitting sealing, in particular to a port sealing structure for a stainless steel pipe and a use method thereof. According to the port sealing structure for the stainless steel pipe and the using method of the port sealing structure, the end cover is used for sealing, and the end cover is prevented from being separated from the port of the stainless steel pipe under the condition of vibration through the expansion mechanism, so that the sealing effect is ensured, and the service life of the stainless steel pipe is prolonged.

Description

Port sealing structure for stainless steel pipe and use method thereof

Technical Field

The invention relates to the field of pipe fitting sealing, in particular to a port sealing structure for a stainless steel pipe and a using method thereof.

Background

The stainless steel pipe is a hollow long-strip round steel material, and is mainly widely used for industrial conveying pipelines and mechanical structural parts such as petroleum, chemical engineering, medical treatment, food, light industry, mechanical instruments and the like, and is applied to various industries after being produced, processed and molded. Generally, in the transportation process of the stainless steel pipe, due to simple storage measures, dust, water and corrosive pollutants in the external environment easily enter the stainless steel pipe from the port of the stainless steel pipe, so that the inside of the stainless steel pipe is corroded, but the stainless steel pipe is not convenient to clean and maintain, and the service life of the stainless steel pipe is shortened.

Disclosure of Invention

The present invention is directed to a port sealing structure for stainless steel pipe and a method for using the same, which solves the above problems of the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

the application at first provides a port sealing structure that stainless steel was used, including the end cover, the side integration of a terminal surface of end cover is fixed with annular protruding, and through the protruding cartridge of annular on stainless steel pipe's port lateral wall, the protruding inboard of annular of end cover is provided with the tight post that expands, the tight post that expands passes through branch fixed connection on the terminal surface of the end cover that corresponds, end cover and the tight post that expands are provided with expanding mechanism between, be provided with the tight mechanism that expands on the tight post that expands, expanding mechanism is connected with the tight mechanism transmission that expands, one side of the tight post that expands of end cover orientation is fixed with pressure relief mechanism, pressure relief mechanism is linked together with the tight mechanism that expands, and expanding mechanism can be connected with the pressure relief.

Preferably, the expansion mechanism comprises a second cavity arranged at the center of the inner part of the expansion column, the second cavity is a cylindrical cavity, the central axis of the second cavity coincides with the central axis of the expansion column, a piston plate is slidably connected inside the second cavity, and the bottom surface of the piston plate is connected with the bottom surface of the second cavity through a second spring.

Preferably, tight mechanism expands still including seting up at the inside cavity one of the tight post that expands, cavity one is the cavity of annular form, and cavity two is located cavity one inboard, and the central axis of cavity one coincides with the central axis of cavity two, has seted up a plurality of slides on the lateral wall of the tight post that expands, and is a plurality of the slide moves towards equidistant range along the circumference of the periphery wall of the tight post that expands, and the trend perpendicular to of slide expands the central axis of tight post, and the slide is linked together with cavity one, and the inside sliding connection of slide has the ejector pin, and the one end that the ejector pin is located the slide outside is fixed with the stripper plate.

Preferably, the end cover is provided with exhaust holes penetrating through two sides of the end cover, one end of each exhaust hole, facing the expansion column, is communicated with the air outlet end of the pressure relief mechanism, an exhaust channel is arranged inside the expansion column, one end of the exhaust channel is communicated with the first cavity, the other end of the exhaust channel is communicated with the lower end of the exhaust pipe, the upper end of the exhaust pipe is communicated with the air inlet end of the pressure relief mechanism, a connecting channel is arranged inside the expansion column, two ends of the connecting channel are respectively communicated with the first cavity and the second cavity, a check valve II is arranged inside the connecting channel, and the conduction direction of the check valve II points to.

Preferably, an air inlet hole penetrating through two sides of the end cover is formed in the end cover, a first check valve and an air inlet pipe are respectively connected to two ports of the air inlet hole, the first check valve is located on one side, away from the expansion column, of the end cover, the conduction direction of the first check valve points to the air inlet hole, one end, away from the air inlet hole, of the air inlet pipe is communicated with an air inlet channel formed in the expansion column, and the air inlet channel is communicated with the upper end portion of the second cavity.

Preferably, the pressure relief mechanism comprises an exhaust funnel fixed on the end cover, the central axis of the exhaust funnel is perpendicular to the central axis of the end cover, a right port of the exhaust funnel is communicated with the exhaust pipe, a through hole is formed in the left end of the upper side wall of the exhaust funnel and is communicated with a lower port of the exhaust hole, a sealing ring is fixed on the inner wall of the exhaust funnel and is located on the right side of the through hole, a through groove is formed in the center of the sealing ring, a plug is arranged on the left side of the sealing ring and can be plugged, the right end of the plug is connected with the convex rod through a third spring, and the convex rod is fixedly connected to the.

Preferably, a connecting rod penetrates through the side wall of the left end of the exhaust funnel, the connecting rod can slide left and right on the side wall of the left end of the exhaust funnel, the right end of the connecting rod is fixedly connected with the left end face of the plug, a gap is reserved between the connecting rod and the inner wall of the through groove, a top block is fixed at the left end of the connecting rod, and the left side face of the top block is an inclined plane inclined downwards.

Preferably, the expansion mechanism comprises a screw rod, the lower end shaft of the screw rod is rotatably connected to the center of the upper end face of the expansion column, the upper end of the screw rod penetrates through the end cover and is located on the upper side of the end cover, the screw rod can rotate on the end cover in a fixed-shaft mode, a rotary disc is fixed to the upper end of the screw rod, the screw rod and the end cover share the central axis, a threaded sleeve is sleeved on the screw rod and is in threaded connection with the screw rod, and the threaded sleeve can be in abutting-buckling contact with the inclined plane of the ejector block.

Preferably, be connected through the telescopic link respectively between swivel nut and each stripper plate, the telescopic link includes the sleeve, telescopic both ends inboard sliding connection has slide bar one and slide bar two respectively, slide bar one and slide bar two are located the inside one end of sleeve and are connected through spring one, slide bar one is located the outside one end of sleeve and is connected with the upper end dead axle rotation of the stripper plate that corresponds, slide bar two is located the outside one end of sleeve and is connected with the periphery wall dead axle rotation of swivel nut.

Correspondingly, the application provides a using method of the port sealing structure for the stainless steel pipe on the basis of the structure, and the using method comprises the following steps:

the method comprises the following steps: the expansion mechanism is driven by the expansion mechanism to be connected with the stainless steel pipe;

step two: the extrusion force between the stainless steel pipe and the expansion mechanism is increased by driving the expansion mechanism through vibration;

step two: the expansion mechanism drives the pressure relief mechanism to relieve pressure of the expansion mechanism, and the expansion mechanism is reset, so that the end cover can be taken down from the stainless steel pipe.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the expansion mechanism is driven by the expansion mechanism to be connected with the stainless steel pipe, the installation and fastening of the end cover are realized by utilizing the pre-tightening effect of the expansion mechanism, the extrusion force between the expansion mechanism and the stainless steel pipe is increased by driving the expansion mechanism through vibration, external force application is not required, the connection between the extrusion plate and the inner side wall of the stainless steel pipe is more stable, and the end cover is prevented from being separated from the port of the stainless steel pipe under the vibration condition, so that the sealing effect of the end cover on the stainless steel pipe in the transportation process is ensured, and external dust, water, corrosive pollutants and the like are prevented from entering the inside of the stainless steel pipe, so that the service life of the stainless steel pipe is prolonged, the whole.

Drawings

FIG. 1 is a first schematic view of the cross-sectional structure of the final assembly of the present invention;

FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1;

FIG. 3 is an enlarged view of the structure at B in FIG. 1;

FIG. 4 is a schematic view of the cross-sectional structure of the final assembly of the present invention;

fig. 5 is an enlarged schematic view of the structure at C in fig. 4.

In the figure: 1. an end cap; 2. a turntable; 3. a one-way valve I; 4. an air inlet; 5. a strut; 6. a sleeve; 7. a first sliding rod; 8. an air inlet pipe; 9. a first spring; 10. a second sliding rod; 11. a threaded sleeve; 12. a screw; 13. an air intake passage; 14. a second one-way valve; 15. an exhaust hole; 16. an exhaust funnel; 17. an exhaust pipe; 18. an exhaust passage; 19. a telescopic rod; 20. a slideway; 21. a first cavity; 22. a piston plate; 23. a second spring; 24. a second cavity; 25. expanding the column; 26. a top rod; 27. a pressing plate; 28. a nose bar; 29. a third spring; 30. a seal ring; 31. a plug; 32. a connecting rod; 33. a top block; 34. a connecting channel.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Generally, in the transportation process of the stainless steel pipe, due to simple storage measures, dust, water and corrosive pollutants in the external environment are easy to enter the stainless steel pipe from the port, and the port sealing structure on the market is unstable, so that the problems still occur in the using process.

Referring to fig. 1 to 5, the present invention provides a technical solution:

the utility model provides a port seal structure that nonrust steel pipe was used, including end cover 1, the side integration of an end face of end cover 1 is fixed with annular bulge, this annular bulge can customize the pipe diameter of adaptation in the nonrust steel pipe of difference, and through the protruding cartridge of annular on the port lateral wall of nonrust steel pipe, the protruding inboard of annular of end cover 1 is provided with the tight post 25 that expands, the tight post 25 that expands is through 5 fixed connection of branch on the terminal surface of the end cover 1 that corresponds, be provided with expanding mechanism between end cover 1 and the tight post 25 that expands, be provided with the tight mechanism that expands on the tight post 25 that expands, expanding mechanism is connected with the tight mechanism transmission that expands, one side of the tight post 25 that expands of end cover 1 orientation is fixed with pressure relief mechanism, pressure relief mechanism is linked together with the tight mechanism that expands.

In this embodiment, as shown in fig. 1, 2 and 4, the expansion mechanism includes a second cavity 24 opened at the center inside the expansion column 25, the second cavity 24 is a cylindrical cavity, the central axis of the second cavity 24 coincides with the central axis of the expansion column 25, a piston plate 22 is slidably connected inside the second cavity 24, the bottom surface of the piston plate 22 is connected with the bottom surface of the second cavity 24 through a second spring 23, the piston plate 22 is made of a metal material with a relatively high density, such as iron, so that the piston plate has a sufficient inertia force, and a sealing ring is embedded in the outer peripheral wall of the piston plate 22 to ensure airtightness between the outer peripheral wall of the piston plate 22 and the inner side wall of the second cavity 24.

In this embodiment, as shown in fig. 1, fig. 2, and fig. 4, the expansion mechanism further includes a first cavity 21 provided inside the expansion column 25, the first cavity 21 is a ring-shaped cavity, a second cavity 24 is located inside the first cavity 21, a central axis of the first cavity 21 coincides with a central axis of the second cavity 24, a plurality of slideways 20 are provided on an outer side wall of the expansion column 25, the slideways 20 are arranged at equal intervals along a circumferential direction of an outer peripheral wall of the expansion column 25, a direction of the slideways 20 is perpendicular to the central axis of the expansion column 25, the slideways 20 are communicated with the first cavity 21, an ejector rod 26 is slidably connected inside the slideways 20, a pressing plate 27 is fixed to one end of the ejector rod 26 located outside the slideways 20, and a sealing ring is used for sealing between the ejector rod 26 and an inner wall of the slideways 20, so as to ensure air tightness.

In this embodiment, as shown in fig. 1 and 4, the end cap 1 is provided with an exhaust hole 15 penetrating through two sides of the end cap 1, one end of the exhaust hole 15 facing the expansion column 25 is communicated with an air outlet end of the pressure relief mechanism, an exhaust channel 18 is provided inside the expansion column 25, one end of the exhaust channel 18 is communicated with the first cavity 21, the other end is communicated with a lower end of the exhaust pipe 17, an upper end of the exhaust pipe 17 is communicated with an air inlet end of the pressure relief mechanism, a connecting channel 34 is provided inside the expansion column 25, two ends of the connecting channel 34 are respectively communicated with the first cavity 21 and the second cavity 24, a check valve second 14 is provided inside the connecting channel 34, and a conduction direction of the check valve second 14 points to the first cavity 21.

In this embodiment, as shown in fig. 1 and 4, an air inlet 4 penetrating through two sides of the end cover 1 is formed in the end cover 1, two ports of the air inlet 4 are respectively connected with a first check valve 3 and an air inlet pipe 8, the first check valve 3 is located on one side of the end cover 1 departing from the expansion column 25, the conduction direction of the first check valve 3 points to the air inlet 4, one end, away from the air inlet 4, of the air inlet pipe 8 is communicated with an air inlet channel 13 formed inside the expansion column 25, and the air inlet channel 13 is communicated with the upper end of the second cavity 24.

In this embodiment, as shown in fig. 3 and 5, the pressure relief mechanism includes an exhaust funnel 16 fixed on the end cover 1, a central axis of the exhaust funnel 16 is perpendicular to a central axis of the end cover 1, a right port of the exhaust funnel 16 is communicated with the exhaust pipe 17, a left end of an upper side wall of the exhaust funnel 16 is provided with a through hole, the through hole is communicated with a lower port of the exhaust hole 15, a sealing ring 30 is fixed on an inner wall of the exhaust funnel 16, the sealing ring 30 is located on a right side of the through hole, a through groove is formed in a center of the sealing ring 30, a plug 31 is arranged on a left side of the sealing ring 30, the plug 31 can plug the through groove, a right end of the plug 31 is connected with a convex rod 28 through a spring three 29.

In this embodiment, as shown in fig. 3 and 5, a connecting rod 32 penetrates through a left end side wall of the exhaust funnel 16, the connecting rod 32 can slide left and right on the left end side wall of the exhaust funnel 16, a right end of the connecting rod 32 is fixedly connected with a left end surface of the plug 31, a gap is left between the connecting rod 32 and an inner wall of the through groove, a top block 33 is fixed at a left end of the connecting rod 32, and a left side surface of the top block 33 is an inclined surface inclined downward.

In this embodiment, as shown in fig. 1 and 4, the expansion mechanism includes a screw 12, a lower end shaft of the screw 12 is rotatably connected to a center of an upper end face of the expansion column 25, an upper end of the screw 12 passes through the end cover 1 and is located on an upper side of the end cover 1, the screw 12 can perform fixed-axis rotation on the end cover 1, a turntable 2 is fixed to an upper end of the screw 12, the screw 12 and the end cover 1 share a central axis, a threaded sleeve 11 is sleeved on the screw 12, the threaded sleeve 11 is in threaded connection with the screw 12, and the threaded sleeve 11 can be in abutting-buckling contact with an inclined plane of the top block 33.

In this embodiment, as shown in fig. 1 and 4, the screw sleeve 11 is connected to each of the extrusion plates 27 through an expansion link 19, the expansion link 19 includes a sleeve 6, inner sides of two ends of the sleeve 6 are connected to a first sliding rod 7 and a second sliding rod 10 in a sliding manner, ends of the first sliding rod 7 and the second sliding rod 10, which are located inside the sleeve 6, are connected through a first spring 9, an end of the first sliding rod 7, which is located outside the sleeve 6, is connected to an upper end of the corresponding extrusion plate 27 in a fixed-axis rotating manner, and an end of the second sliding rod 10, which is located outside the sleeve 6, is connected to an outer peripheral wall of.

In order to embody the using method and the advantages of the invention, the application provides a method for using the port sealing structure for the stainless steel pipe in sealing the port of the stainless steel pipe, which comprises the following steps:

the method comprises the following steps: as shown in fig. 4, the annular protrusion of the end cap 1 is clamped on the outer side wall of the port of the stainless steel tube, and the state shown in fig. 4 is an initial state, at this time, the screw sleeve 11 is at the upper end of the screw rod 12, and the expansion rod 19 pulls the extrusion block 27 to approach the outer peripheral wall of the expansion column 25, so as to keep the expansion diameter of the extrusion plate 27 small, and thus the extrusion plate can be smoothly inserted into the port of the stainless steel tube;

after the end cover 1 is sealed, the rotary disc 2 is held by hand and the rotary disc 2 is rotated, so that the rotary disc 2 synchronously drives the screw 12 to rotate, the screw 12 drives the threaded sleeve 11 to move downwards under the action of screw transmission, the downward movement of the threaded sleeve 11 applies outward thrust to the corresponding extrusion plate 27 through each telescopic rod 19, the thrust enables the extrusion plate 27 to move towards one side away from the periphery of the expansion column 25 and approach towards the inner side wall of the stainless steel pipe, as shown in fig. 1, after the extrusion plate 27 is buckled with the inner side wall of the stainless steel pipe, because the inner side wall of the stainless steel pipe is limited, after the extrusion plate 27 is buckled with the inner side wall of the stainless steel pipe, because the inner side wall of the stainless steel pipe applies a reaction force to the extrusion plate 27, the extrusion plate does not move any more, because the threaded sleeve 11 continuously moves downwards, the threaded sleeve 11 applies a downward force to the sliding rod two 10, and further the sliding rod two 10 compresses the, the first spring 9 stores elastic force, the elastic force applies pressure to the extrusion plate 27 through the first sliding rod 7, the component force of the pressure in the direction parallel to the ejector rod 26 enables the extrusion plate 27 to tightly press the inner side wall of the stainless steel pipe, and the pre-tightening effect is achieved, so that the expansion column and the end cover 1 are fixed at the port of the stainless steel pipe under the action of friction force between the extrusion plate 27 and the stainless steel pipe, the end cover 1 is installed and fastened, the whole operation is simple and convenient, the extrusion plates 27 are in contact with the inner side wall of the stainless steel pipe at equal intervals, the stainless steel pipe is stressed uniformly and cannot deform, a thread force application mode is adopted, the effect of saving power is achieved, the thread has axial self-locking performance, the stability of the screw sleeve 11 in the axial direction is guaranteed, and the extrusion plate 27 is prevented from being separated from the inner side wall of;

step two: after the end cover 1 is installed, in the transportation process of the stainless steel pipe, the stainless steel pipe shakes due to road surface bumping, as shown in fig. 1, the shaking of the stainless steel pipe enables the piston plate 22 to have inertia force, so that the piston plate 22 slides up and down in the cavity two 24, when the piston plate 22 moves up in the cavity two 24, air in the cavity two 24 is compressed and pressurized, because the conduction direction of the check valve one 3 points to the air inlet 4, and the conduction direction of the check valve two 14 points to the cavity one 21, the pressurized air in the cavity two 24 enters the cavity one 21 through the connecting channel 34, so that the internal pressure of the cavity one 21 is increased, the spring two 23 is stretched while the piston plate 22 moves up, so that the spring two 23 obtains a downward restoring force, after the upward inertia force of the piston plate 22 disappears, the piston plate 22 moves down under the downward restoring force of the spring two 23, the downward movement of the piston plate 22 increases the internal volume of the cavity II 24 and generates a suction force, and because the conduction direction of the check valve I3 points to the air inlet 4 and the conduction direction of the check valve II 14 points to the cavity I21, the suction force enables external air to enter the cavity II 24 through the check valve I3, the air inlet 4, the air inlet pipe 8 and the air inlet channel 13, so that the automatic supplement of the air in the cavity II 24 is realized, the internal part of the cavity I21 is pressurized when the stainless steel pipe vibrates next time, and the stainless steel pipe is driven by vibration energy to pressurize and work in the cavity I21 in the transportation process;

after the internal pressure of the first cavity 21 is increased, the air pressure applies a thrust force pointing to the outer side of the expansion column 25 to the ejector rod 26, so that the ejector rod 26 applies pressure to the extrusion plate 27, the extrusion force between the extrusion plate 27 and the inner side wall of the stainless steel tube is increased, connection between the extrusion plate 27 and the inner side wall of the stainless steel tube is more stable, the end cover 1 is prevented from being separated from the port of the stainless steel tube under the condition of vibration, the sealing effect of the end cover 1 on the stainless steel tube in the transportation process is ensured, external dust, water, corrosive pollutants and the like are prevented from entering the stainless steel tube, the service life of the stainless steel tube is prolonged, external force application is not needed in the whole process, and the structure is;

step three: as shown in fig. 1 and 3, when the extrusion plate 27 is in abutting-buckling contact with the inner side wall of the stainless steel tube, the threaded sleeve 11 is not in contact with the ejector block 33, and at this time, the plug 31 plugs the through groove in the middle of the sealing ring 30 under the action of the spring iii 29, so that air in the cavity i 21 is not discharged from the exhaust funnel 16, and therefore, the pressure relief condition in the cavity i 21 is ensured in the transportation process, and the extrusion stability of the extrusion plate 27 and the inner side wall of the stainless steel tube is ensured;

when the end cover 1 needs to be taken down from the stainless steel pipe, the rotary disc 2 is held by hand and the rotary disc 2 is rotated reversely, so that the rotary disc 2 synchronously drives the screw 12 to rotate reversely, the reverse rotation of the screw 12 drives the screw sleeve 11 to move upwards under the action of screw transmission, the screw sleeve 11 moves upwards to stretch the spring I9 through the slide rod II 10, so that the spring I9 is stretched and stores elastic force, the elastic force applies pulling force to the extrusion plate 27 through the slide rod I7, the component force of the pressure in the direction parallel to the ejector rod 26 enables the extrusion plate 27 to have the tendency of being far away from the inner side wall of the stainless steel pipe and approaching the expansion column 25, but the ejector rod 26 still bears larger pressure under the action of the air pressure in the cavity I21, so that the extrusion plate 27 cannot return in time, as shown in figures 4 and 4, when the screw sleeve 11 moves upwards to abut against and lock with the inclined surface of the rear ejector block 33, thereby make kicking block 33 drive connecting rod 32 and exert the thrust of right to end cap 31, thereby make end cap 31 move to the right, and compress spring three 29 simultaneously, make spring three 29 obtain a resilience of left, end cap 31 moves to the right back and no longer blocks up to the through groove on the sealing washer 30, the inside air of cavity one 21 passes through exhaust passage 18, blast pipe 17, aiutage 16 and exhaust hole 15 and discharges, thereby make the inside pressure of cavity one 21 reduce, and do not have atmospheric pressure to ejector pin 26, thereby make stripper plate 27 be close to and reset to the tight post 25 of expanding under the spring action of spring one 9, and keep away from contactless with the inside wall of stainless steel pipe simultaneously, and then make end cover 1 can follow the port department of stainless steel pipe and take off, the operation is simple and convenient, and whole device can recycle.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. The utility model provides a port seal structure that nonrust steel pipe was used, includes end cover (1), the side integration of a terminal surface of end cover (1) is fixed with annular protruding, and through the protruding cartridge of annular on the port lateral wall of nonrust steel pipe, its characterized in that: the utility model discloses an end cover (1) for the automobile, including the annular protruding inboard of end cover (1), the protruding inboard of annular is provided with bloated tight post (25), bloated tight post (25) are through branch (5) fixed connection on the terminal surface of the end cover (1) that corresponds, end cover (1) and expand and be provided with expanding mechanism between tight post (25), it expands tight mechanism to be provided with on tight post (25) to expand, expanding mechanism is connected with the transmission of the tight mechanism that expands, one side of end cover (1) orientation bloated tight post (25) is fixed with pressure relief mechanism, pressure relief mechanism is linked together with the tight mechanism that expands, and expanding mechanism can be connected with the transmission of pressure relief mechanism.

2. The port sealing structure for stainless steel pipe as claimed in claim 1, wherein: the expansion mechanism comprises a second cavity (24) which is arranged at the center of the inner part of the expansion column (25), the second cavity (24) is a cylindrical cavity, the central axis of the second cavity (24) coincides with the central axis of the expansion column (25), a piston plate (22) is connected to the inner part of the second cavity (24) in a sliding mode, and the bottom surface of the piston plate (22) is connected with the bottom surface of the second cavity (24) through a second spring (23).

3. The port sealing structure for stainless steel pipe as claimed in claim 2, wherein: the expansion mechanism further comprises a first cavity (21) arranged inside the expansion column (25), the first cavity (21) is a ring-shaped cavity, the second cavity (24) is located on the inner side of the first cavity (21), the central axis of the first cavity (21) is overlapped with the central axis of the second cavity (24), a plurality of slide ways (20) are arranged on the outer side wall of the expansion column (25), the slide ways (20) are arranged at equal intervals along the circumferential direction of the outer peripheral wall of the expansion column (25), the direction of the slide ways (20) is perpendicular to the central axis of the expansion column (25), the slide ways (20) are communicated with the first cavity (21), a push rod (26) is connected inside the slide ways (20) in a sliding mode, and an extrusion plate (27) is fixed at one end, located on the outer side of the slide ways (20), of the push rod (26); set up exhaust hole (15) that link up end cover (1) both sides on end cover (1), exhaust hole (15) are linked together towards the one end of the tight post of expanding (25) and the end of giving vent to anger of pressure relief mechanism and are held, tight post of expanding (25) inside exhaust passage (18) of having seted up, the one end and the cavity one (21) of exhaust passage (18) are linked together, and the other end is linked together with the lower extreme of blast pipe (17), the upper end and the inlet end of pressure relief mechanism of blast pipe (17) hold the intercommunication, connecting channel (34) have been seted up to the inside of tight post of expanding (25), and the both ends of connecting channel (34) communicate cavity one (21) and cavity two (24) respectively, and connecting channel (34) inside be provided with check valve two (14), the directional cavity one (21) of the direction of switching on of check valve.

4. A port closure structure for a stainless steel pipe according to claim 3, wherein: the end cover (1) is provided with an air inlet hole (4) penetrating through two sides of the end cover (1), two ports of the air inlet hole (4) are respectively connected with a one-way valve (3) and an air inlet pipe (8), the one-way valve (3) is located on one side, deviating from the expansion column (25), of the end cover (1), and the conduction direction of the one-way valve (3) points to the air inlet hole (4).

5. A port closure structure for a stainless steel pipe according to claim 4, wherein: one end of the air inlet pipe (8), which is far away from the air inlet hole (4), is communicated with an air inlet channel (13) which is arranged inside the expansion column (25), and the air inlet channel (13) is communicated with the upper end part of the second cavity (24).

6. A port closure structure for a stainless steel pipe according to claim 3, wherein: the pressure relief mechanism comprises an exhaust funnel (16) fixed on the end cover (1), the central axis of the exhaust funnel (16) is vertical to the central axis of the end cover (1), the right port of the exhaust funnel (16) is communicated with an exhaust pipe (17), the left end of the upper side wall of the exhaust funnel (16) is provided with a through hole, the through hole is communicated with the lower port of the exhaust hole (15), a sealing ring (30) is fixed on the inner wall of the exhaust cylinder (16), the sealing ring (30) is positioned at the right side of the through hole, a through groove is arranged at the center of the sealing ring (30), a plug (31) is arranged on the left side of the sealing ring (30), the plug (31) can plug the through groove, the right end of the plug (31) is connected with a convex rod (28) through a spring III (29), and the convex rod (28) is fixedly connected to the inner wall of the exhaust funnel (16).

7. The port sealing structure for stainless steel pipe as claimed in claim 6, wherein: the exhaust pipe is characterized in that a connecting rod (32) penetrates through the side wall of the left end of the exhaust pipe (16), the connecting rod (32) can slide left and right on the side wall of the left end of the exhaust pipe (16), the right end of the connecting rod (32) is fixedly connected with the left end face of the plug (31), a gap is reserved between the connecting rod (32) and the inner wall of the through groove, a top block (33) is fixed at the left end of the connecting rod (32), and the left side face of the top block (33) is an inclined plane inclined downwards.

8. The port sealing structure for stainless steel pipe as claimed in claim 7, wherein: the expansion mechanism comprises a screw rod (12), the lower end of the screw rod (12) is rotatably connected to the center of the upper end face of the expansion column (25) in a shaft rotating mode, the upper end of the screw rod (12) penetrates through the end cover (1) and is located on the upper side of the end cover (1), the screw rod (12) can rotate on the end cover (1) in a fixed shaft mode, a rotary disc (2) is fixed to the upper end of the screw rod (12), the screw rod (12) and the end cover (1) share the central axis, a threaded sleeve (11) is sleeved on the screw rod (12), the threaded sleeve (11) is in threaded connection with the screw rod (12), and the threaded sleeve (11) can be in abutting-buckling contact with the inclined plane of the ejector block (33).

9. The port sealing structure for stainless steel pipe as claimed in claim 8, wherein: be connected through telescopic link (19) respectively between swivel nut (11) and each stripper plate (27), telescopic link (19) include sleeve (6), there are slide bar (7) and slide bar two (10) in the both ends inboard sliding connection respectively of sleeve (6), slide bar (7) and slide bar two (10) are located the inside one end of sleeve (6) and are connected through spring (9), slide bar (7) are located the outside one end of sleeve (6) and are connected with the upper end dead axle rotation of corresponding stripper plate (27), slide bar two (10) are located the outside one end of sleeve (6) and are connected with the periphery wall dead axle rotation of swivel nut (11).

10. The method of using a port closure structure for a stainless steel pipe as claimed in any one of claims 1 to 9, wherein: the method comprises the following steps:

the method comprises the following steps: the expansion mechanism is driven by the expansion mechanism to be connected with the stainless steel pipe;

step two: the extrusion force between the stainless steel pipe and the expansion mechanism is increased by driving the expansion mechanism through vibration;

step two: the expansion mechanism drives the pressure relief mechanism to relieve pressure of the expansion mechanism, and the expansion mechanism is reset, so that the end cover (1) can be taken down from the stainless steel pipe.

Images