Pipe end face sealing system and sealing method thereof

Abstract

This invention relates to the field of pipe processing technology, and more specifically, to a pipe end-face sealing system and method. The system includes a guiding drive device, an expansion and fixing device, an end-face coating device, and an extrusion welding gun. The guiding drive device includes a first guiding drive part and a second guiding drive part, with a connecting part rotatably connected to the second guiding drive part. The expansion and fixing device includes a movable clamping plate assembly and an expansion member, with the movable clamping plate assembly being drively connected to the first guiding drive part. When the expansion and fixing device expands and fixes, the movable clamping plate assembly extends into the expansion member and makes an interference fit with it. The end-face coating device includes a first abutting coating mechanism and a second abutting coating mechanism, and the first abutting coating mechanism, the second abutting coating mechanism, and the extrusion welding gun are all connected to the connecting part, with the extrusion end of the extrusion welding gun facing the end-face coating device. This invention can be used for effective coating of the pipe end face with exposed interlayer after sawing, thereby improving the quality of pipe laying.

Description

Technical Field

[0001] This invention relates to the field of pipe processing technology, and more specifically, to a pipe end-face sealing system and sealing method thereof. Background Technology

[0002] During the manufacturing and processing of pipes, such as composite pipes with a sandwich design like polyethylene composite pipes, to prevent the pipe wall sandwich layer from being exposed at the end face after sawing, it is necessary to seal the end face of the pipe after sawing. Currently, on pipeline laying sites, when sealing the pipe end face, the pipe is first clamped and fixed using clamps, and then the welding fluid is applied manually. However, this sealing method requires a certain amount of space when clamping the pipe, making it unsuitable for narrow or other complex pipeline laying environments. Furthermore, manually applying the welding fluid consumes a lot of manpower and resources and is prone to uneven coating, making it difficult to effectively improve the quality of pipeline laying. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pipe end face sealing system and sealing method that is easy to use and can be used for effective coating of pipe end faces with exposed interlayer after sawing, thereby improving the quality of pipe laying.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A pipe end-face sealing system is provided, including a guide drive device, and further including an expansion fixing device, an end-face roller coating device, and an extrusion welding gun arranged sequentially. The expansion fixing device, the end-face roller coating device, and the extrusion welding gun are all connected to the guide drive device. The guide drive device includes a first guide drive part and a second guide drive part connected to the first guide drive part, with a connecting part rotatably connected to the second guide drive part. The expansion fixing device includes a movable clamp assembly and an expansion member disposed at the movable clamp assembly. The movable clamp assembly is drively connected to the first guide drive part. When the first guide drive part drives the expansion fixing device to expand and fix, the movable clamp assembly extends into the expansion member and is interference-fitted with the expansion member. The end-face roller coating device includes a first abutting roller coating mechanism for abutting the inner ring of the pipe and a second abutting roller coating mechanism for abutting the outer ring of the pipe. The first abutting roller coating mechanism, the second abutting roller coating mechanism, and the extrusion welding gun are all connected to the connecting part, with the extrusion end of the extrusion welding gun facing the end-face roller coating device.

[0006] This invention includes a pipe end-face sealing system. An expansion fixing device is inserted into the pipe, and a movable clamping plate assembly is driven by a first guide drive unit to extend into the expansion member and make an interference fit with the expansion member. The expansion member can be tightly fitted to the inner wall of the pipe to achieve fixation. This system can be used to stably control the coating thickness of the welding fluid at the pipe end face. An extrusion welding gun is used to extrude the welding fluid onto the pipe end face. Then, a first abutting roller coating mechanism and a second abutting roller coating mechanism are used for rotating abutting roller coating of the inner and outer rings of the pipe, respectively, to complete the effective, rapid and uniform coating of the pipe end face, reducing the waste of manpower and material resources and improving work efficiency.

[0007] Preferably, the movable clamping plate assembly includes a first clamping plate and a second clamping plate, and the expansion member is an expansion sleeve disposed between the first clamping plate and the second clamping plate. The first clamping plate is drivenly connected to the first guide drive unit, and the second clamping plate is slidably connected to the first guide drive unit. An elastic reset component is also provided between the first clamping plate and the second clamping plate. When the first guide drive unit is driven to extend the first clamping plate and the second clamping plate into the expansion sleeve, there is an interference fit between the first clamping plate and the expansion sleeve, and between the second clamping plate and the expansion sleeve.

[0008] Preferably, the cross-sectional areas of the first clamping plate and the second clamping plate gradually decrease from the end away from the expansion sleeve to the end closer to the expansion sleeve; the expansion sleeve includes a first accommodating section, a connecting section, and a second accommodating section connected in sequence, and the cross-sectional areas of the first accommodating section and the second accommodating section gradually decrease from the end away from the connecting section to the end closer to the connecting section; when the first clamping plate and the second clamping plate are inserted into the expansion sleeve, the first accommodating section is interference-fitted with the first clamping plate, and the second accommodating section is interference-fitted with the second clamping plate.

[0009] Preferably, the first contact roller coating mechanism includes a wheel frame and a plurality of first rollers connected to the wheel frame. The wheel frame is connected to the connecting part, and the rolling surface of the first rollers is provided with a first step structure for contacting the end of the pipe.

[0010] Preferably, the wheel frame is provided with a radial adjustment structure, and the first roller is connected to the wheel frame through the radial adjustment structure.

[0011] Preferably, the second contact coating mechanism includes an adjusting rod, an adjusting seat, and a second roller. The rolling surface of the second roller is provided with a second stepped structure for contacting the end of the pipe. The second roller is connected to the adjusting rod, and the adjusting rod is slidably connected to the adjusting seat. The adjusting rod can slide on the adjusting seat in a first direction. The adjusting seat is slidably connected to the connecting part, and the adjusting seat can slide on the connecting part in a second direction. The first direction and the second direction are perpendicular to each other.

[0012] Preferably, the extrusion welding gun includes an extrusion welding gun body connected to the connecting part, a heating extrusion cylinder connected to the extrusion welding gun body, and a wire feeding tube connected to the heating extrusion cylinder, wherein the extrusion end of the heating extrusion cylinder faces the end face coating device; the extrusion welding gun also includes a hot air tube, wherein the air outlet end of the hot air tube faces the end face coating device.

[0013] Preferably, the first guide drive part includes a first connecting shaft, and the second guide drive part includes a second connecting shaft coaxially connected to the first connecting shaft. The connecting part includes a sleeve structure, which is rotatably connected to the second connecting shaft through an elastic guide component, and the sleeve structure can also be slidably connected to the second connecting shaft through the elastic guide component. The movable end of the movable clamping plate assembly is connected to the first connecting shaft through a threaded drive. The first abutting roller coating mechanism, the second abutting roller coating mechanism, and the extrusion welding gun are all connected to the sleeve structure.

[0014] Preferably, the pipe end sealing system further includes a clamping bracket for clamping the pipe, the clamping bracket being close to the expansion fixing device; wherein, the clamping bracket includes a first support arm, a second support arm, and a clamping strap, the first support arm and the second support arm being arranged crosswise, and the intersection of the first support arm and the second support arm being connected by a height adjustment structure, and the two ends of the clamping strap being detachably connected to the first support arm and the second support arm respectively.

[0015] The present invention also provides a sealing method for a pipe end-face sealing system, comprising the following steps:

[0016] S1. Sawing and cleaning the end face of the pipe;

[0017] S2. Insert the expansion fixing device into the pipe until the coating end of the first abutting roller coating mechanism and the coating end of the second abutting roller coating mechanism abut against the inner ring and outer ring of the pipe respectively, and the coating end of the first abutting roller coating mechanism and the coating end of the second abutting roller coating mechanism are close to the end face of the pipe.

[0018] S3. The movable clamping plate assembly is driven by the first guide drive unit to extend into the expansion member. The expansion member is interference-fitted with the movable clamping plate assembly. The expansion member expands radially and fits tightly against the inner wall of the pipe, thus completing the fixation between the pipe and the pipe end face sealing system.

[0019] S4. Activate the extrusion welding gun to extrude the welding fluid to the end face of the pipe, and rotate the connecting part to make the first abutting roller coating mechanism rotate circumferentially at the inner circle of the pipe and the second abutting roller coating mechanism rotate circumferentially at the outer circle of the pipe. The roller coating ends of the first abutting roller coating mechanism and the second abutting roller coating mechanism coat and seal the end face of the pipe circumferentially. During the rotation, the outermost edge of the roller coating trajectory of the first abutting roller coating mechanism is tangent or nearly tangent to the innermost edge of the roller coating trajectory of the second abutting roller coating mechanism.

[0020] S5. After the coating and sealing of the pipe end face is completed, the movable clamping plate assembly is driven by the first guide drive unit to exit the expansion member, the expansion member is separated from the inner wall of the pipe, and the expansion fixing device is removed from the pipe.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] This invention relates to a pipe end-face sealing system and method. An expansion fixing device is inserted into the pipe, and a first connecting shaft drives both a first clamping plate and a second clamping plate to extend into the expansion sleeve, where they are interference-fitted. The expansion sleeve can tightly adhere to the inner wall of the pipe for fixation, enabling stable control of the coating thickness of the fusion fluid at the pipe end face. A hot air duct is used to blow hot air onto the pipe end face for preheating, and a heated extrusion cylinder is used to extrude the fusion fluid onto the pipe end face. Then, the first step structure of the first roller and the second step structure of the second roller are used for rotational abutment and roller coating of the inner and outer rings of the pipe, respectively, to achieve effective, rapid, and uniform coating of the pipe end face, reducing waste of manpower and resources and improving work efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a pipe end-face sealing system according to the present invention;

[0024] Figure 2 This is a schematic diagram of the pipe end sealing system of the present invention from another perspective;

[0025] Figure 3 This is a schematic diagram of the structure of the first clamping plate of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the second clamping plate of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the expansion component of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the first and second abutment roller coating mechanisms of the present invention;

[0029] Figure 7 for Figure 6The main view;

[0030] Figure 8 This is a schematic diagram of the internal structure of a pipe end-face sealing system according to the present invention;

[0031] Figure 9 This is a schematic diagram of the structure of the guide drive device of the present invention;

[0032] Figure 10 This is a schematic diagram of the extrusion welding gun of the present invention;

[0033] Figure 11 This is a diagram illustrating the usage state of a pipe end-face sealing system according to the present invention.

[0034] Figure 12 This is a schematic diagram of the structure of the clamping bracket of the present invention;

[0035] Figure 13 This is a flowchart of a pipe end-face sealing method according to the present invention.

[0036] The markings in the diagram are explained below:

[0037] 1-Guide drive device, 11-First guide drive part, 12-Second guide drive part, 13-Connecting part, 131-Sleeve, 132-First clamp, 133-Second clamp, 14-Elastic guide assembly, 141-First spring, 142-Ball bushing, 15-Limit nut, 16-Handle, 17-Limit assembly, 171-Limit step, 172-Limit sleeve, 18-Baffle, 19-Bearing, 2-Expansion fixing device, 21-First clamp, 211-First retaining ring, 212-Transmission nut, 22-Second clamp, 221-Second retaining ring, 23-Expansion component, 231-First receiving section, 232-Connecting section, 233-Second receiving section, 24-Elastic reset assembly, 2 41-Guide post, 242-Second spring, 243-Stop block, 3-First abutting roller coating mechanism, 31-First roller, 311-First step structure, 32-Wheel frame, 321-Cylindrical frame, 322-Support, 323-Radial adjustment structure, 4-Second abutting roller coating mechanism, 41-Adjusting rod, 42-Adjusting seat, 421-Second oblong hole, 43-Second roller, 431-Second step structure, 5-Extrusion welding gun, 51-Extrusion welding gun body, 52-Heating extrusion cylinder, 521-Extrusion nozzle, 522-Air outlet, 53-Wire feeding tube, 54-Hot air tube, 6-Clamping bracket, 61-First support arm, 62-Second support arm, 63-Clamping strap, 64-Height adjustment structure, 7-Pipe. Detailed Implementation

[0038] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0039] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0040] Example 1

[0041] like Figures 1 to 9 The diagram shows a first embodiment of a pipe end-face sealing system according to the present invention, including a guide drive device 1, and further including an expansion fixing device 2, an end-face roller coating device, and an extrusion welding gun 5 arranged sequentially. The expansion fixing device 2, the end-face roller coating device, and the extrusion welding gun 5 are all connected to the guide drive device 1. The guide drive device 1 includes a first guide drive part 11 and a second guide drive part 12 connected to the first guide drive part 11, with a connecting part 13 rotatably connected to the second guide drive part 12. The expansion fixing device 2 includes a movable clamping plate assembly and an expansion member 23 disposed at the movable clamping plate assembly. The movable clamping plate assembly is drively connected to the first guide drive part 11. When the first guide drive part 11 drives the expansion fixing device 2 to expand and fix, the movable clamping plate assembly extends into the expansion member 23 and is interference-fitted with the expansion member 23. The end face coating device includes a first contact coating mechanism 3 for contact coating of the inner ring of the pipe and a second contact coating mechanism 4 for contact coating of the outer ring of the pipe. The first contact coating mechanism 3, the second contact coating mechanism 4, and the extrusion welding gun 5 are all connected to the connecting part 13. The extrusion end of the extrusion welding gun 5 faces the end face coating device.

[0042] The expansion fixing device 2 is inserted into the pipe 7, and the movable clamp assembly is driven by the first guide drive part 11 to extend into the expansion member 23 and be interference-fitted with the expansion member 23. The expansion member 23 can be tightly fitted to the inner wall of the pipe 7 to achieve fixation, which can be used to stably control the coating thickness of the fusion fluid at the end face of the pipe 7. The extrusion welding gun 5 is used to extrude the fusion fluid onto the end face of the pipe 7. Then, the first abutting roller coating mechanism 3 and the second abutting roller coating mechanism 4 are used for the rotational abutting roller coating of the inner ring and outer ring of the pipe 7, respectively, to complete the effective, fast and uniform coating of the end face of the pipe 7, reduce the waste of manpower and material resources, and improve the work efficiency. The pipe end face sealing system of the present invention can be applied to the pipe end face sealing of glass fiber wound reinforced polyethylene composite pipes.

[0043] like Figures 1 to 5 As shown, the movable clamping plate assembly includes a first clamping plate 21 and a second clamping plate 22. The expansion member 23 is an expansion sleeve disposed between the first clamping plate 21 and the second clamping plate 22. The first clamping plate 21 is connected to the first guide drive unit 11 in a transmission manner, and the second clamping plate 22 is slidably connected to the first guide drive unit 11. An elastic reset component 24 is also provided between the first clamping plate 21 and the second clamping plate 22. When the first guide drive unit 11 is driven to extend the first clamping plate 21 and the second clamping plate 22 into the expansion sleeve, the first clamping plate 21 and the expansion sleeve, and the second clamping plate 22 and the expansion sleeve are both interference fits.

[0044] In this embodiment, the cross-sectional areas of the first clamping plate 21 and the second clamping plate 22 gradually decrease from the end furthest from the expansion sleeve to the end closest to the expansion sleeve. This gradually decreasing cross-sectional area facilitates the entry and exit of the first clamping plate 21 and the second clamping plate 22 into and out of the expansion sleeve, improving operational convenience. In this embodiment, the outer contours of the first clamping plate 21 and the second clamping plate 22 are both frustum-shaped. The expansion sleeve includes a first accommodating section 231, a connecting section 232, and a second accommodating section 233 connected in sequence. The cross-sectional areas of the first accommodating section 231 and the second accommodating section 233 gradually decrease from the end furthest from the connecting section 232 to the end closest to the connecting section 232. When the first clamping plate 21 and the second clamping plate 22 are inserted into the expansion sleeve, the first accommodating section 231 is press-fitted with the first clamping plate 21, and the second accommodating section 233 is press-fitted with the second clamping plate 22. The first accommodating section 231, the connecting section 232, and the second accommodating section 233 are integrally formed. In this embodiment, the expansion sleeve is an expansion rubber ring.

[0045] like Figure 3 and Figure 4 As shown, in order to avoid excessive expansion of the expansion sleeve by the first clamping plate 21 and the second clamping plate 22, a first retaining ring 211 is connected to the first clamping plate 21, and the outer diameter of the first retaining ring 211 is larger than the diameter of the expansion sleeve; a second retaining ring 221 is connected to the second clamping plate 22, and the outer diameter of the second retaining ring 221 is larger than the diameter of the expansion sleeve.

[0046] like Figure 8As shown, the elastic reset assembly 24 includes a guide post 241 and a second spring 242 sleeved on the guide post 241. The guide post 241 passes through the first clamping plate 21 and the second clamping plate 22, and the second spring 242 is located between the first clamping plate 21 and the second clamping plate 22. Stops 243 are fixedly connected to both ends of the guide post 241. In this embodiment, the stops 243 can be used to limit the first clamping plate 21 and the second clamping plate 22, preventing them from slipping off the guide post 241. Specifically, at least two sets of elastic reset assemblies 24 are evenly distributed on the first clamping plate 21 and the second clamping plate 22.

[0047] like Figure 6 and Figure 7 As shown, the first contact roller coating mechanism 3 includes a wheel frame 32 and a plurality of first rollers 31 connected to the wheel frame 32. The wheel frame 32 is connected to the connecting part 13. The rolling surface of the first rollers 31 is provided with a first step structure 311 for contacting the end of the pipe. The concave surface of the first step structure 311 faces the end face of the pipe. The wheel frame 32 is provided with a radial adjustment structure 323, and the first rollers 31 are connected to the wheel frame 32 through the radial adjustment structure 323.

[0048] The wheel frame 32 includes a cylindrical frame 321 and multiple supports 322 fixed to the cylindrical frame 321. The cylindrical frame 321 is connected to the connecting part 13. The radial adjustment structure 323 is a first oblong hole provided on the support 322, and the extension direction of the first oblong hole is along the radial direction of the cylindrical frame 321. The first roller 31 is connected to the support 322 after passing through the first oblong hole with bolts. In this embodiment, three first rollers 31 are evenly distributed on the wheel frame 32, and correspondingly, three supports 322 are also provided. The diameter of the coating trajectory of the first abutting roller coating mechanism 3 can be adjusted by adjusting the position of the first roller 31 through the first oblong hole, so that the first abutting roller coating mechanism 3 can be used for rolling coating of pipe end faces of different specifications.

[0049] like Figure 6 and Figure 7 As shown, the second contact roller coating mechanism 4 includes an adjusting rod 41, an adjusting seat 42, and a second roller 43. The rolling surface of the second roller 43 is provided with a second step structure 431 for contacting the end of the pipe, and the concave surface of the second step structure 431 faces the end face of the pipe. The second roller 43 is connected to the adjusting rod 41, and the adjusting rod 41 is slidably connected to the adjusting seat 42. The adjusting rod 41 can slide on the adjusting seat 42 in a first direction. The adjusting seat 42 is slidably connected to the connecting part 13, and the adjusting seat 42 can slide on the connecting part 13 in a second direction. The first direction and the second direction are perpendicular to each other.

[0050] In this embodiment, the adjusting rod 41 is an adjusting screw, and the second roller 43 is connected to the end of the adjusting screw. The adjusting seat 42 is provided with a first internal thread, and the adjusting screw is connected to the adjusting seat 42 through the first internal thread. The adjusting seat 42 is provided with a plurality of second oblong holes 421, and the adjusting seat 42 is connected to the connecting part 13 after passing through the second oblong holes 421 with bolts. The direction of movement of the adjusting screw is perpendicular to the extension direction of the second oblong holes 421. When the second abutting roller coating mechanism 4 is mounted on the end face of the pipe 7, the adjusting screw can be used to adjust the position of the second roller 43 in the axial direction of the pipe 7, and the second oblong holes 421 can be used to adjust the position of the second roller 43 in the radial direction of the pipe.

[0051] like Figure 1 , Figure 2 , Figures 6 to 9 As shown, the first guide drive unit 11 includes a first connecting shaft, and the second guide drive unit 12 includes a second connecting shaft. The first end of the first connecting shaft and the first end of the second connecting shaft are coaxially connected. When the first connecting shaft rotates, the second connecting shaft will also rotate synchronously. The connecting part 13 includes a sleeve structure, which includes a sleeve 131 and a clamping assembly connected to the outer wall of the sleeve 131. The sleeve 131 is rotatably connected to the second connecting shaft through an elastic guide assembly 14, and the sleeve 131 can also be slidably connected to the second connecting shaft through the elastic guide assembly 14.

[0052] like Figure 8 and Figure 9 As shown, in this embodiment, the first connecting shaft has a first external thread near the second end, and the first clamping plate 21 is connected to the first external thread via a transmission nut 212. To reduce friction between the second clamping plate 22 and the first connecting shaft, the second clamping plate 22 and the first connecting shaft are also connected by several bearings 19. Figure 6 As shown, the first abutting roller coating mechanism 3 is sleeved with the sleeve 131 via the wheel frame 32. Specifically, the cylindrical frame 321 is sleeved with the sleeve 131 via bolts. In this embodiment, the clamping assembly includes a first clamping seat 132 and a second clamping seat 133. The first clamping seat 132 is fixedly connected to the sleeve 131. Both the first clamping seat 132 and the second clamping seat 133 are provided with semi-annular grooves. The extrusion welding gun 5 is engaged with the clamping assembly via the semi-annular grooves. Specifically, the first clamping seat 132 and the second clamping seat 133 are connected by bolts. The distance between the first clamping seat 132 and the second clamping seat 133 can be adjusted by the bolts connecting them, facilitating the clamping operation of the extrusion welding gun 5. In this embodiment, the second abutting roller coating mechanism 4 is connected to the side of the first clamping seat 132 via an adjusting seat 42. Specifically, the adjusting seat 42 is connected to the side of the first clamping seat 132 via bolts passing through the second oblong hole 421.

[0053] like Figure 8 and Figure 9 As shown, the elastic guide assembly 14 includes a first spring 141, one end of which abuts against the sleeve 131, and the other end abuts against the second clamping plate 22. To enable smooth sliding between the sleeve 131 and the second connecting shaft, the elastic guide assembly 14 also includes a ball bushing 142 between the sleeve 131 and the second connecting shaft; the operability between the sleeve 131 and the second connecting shaft can be further improved by providing a bearing 19.

[0054] like Figure 2 , Figure 8 and Figure 9 As shown, a second external thread is provided on the second connecting shaft near its second end. A limit nut 15 is driven and connected to the second external thread. The limit nut 15 is located on the outside of the sleeve 131 and can be used to limit the sleeve 131 sliding on the second connecting shaft. A handle 16 is also fixedly connected to the second end of the second connecting shaft. By rotating the handle 16, the first connecting shaft and the second connecting shaft can be rotated simultaneously. In turn, the movement of the first clamp 21 can be controlled by the transmission nut 212, thereby switching the expansion fixing device 2 between the expanded and non-expanded states.

[0055] like Figure 8 and Figure 9 As shown, to prevent the first clamping plate 21 from slipping off the first connecting shaft, a baffle 18 is bolted to the second end of the first connecting shaft. To limit the travel of the first clamping plate 21 and the second clamping plate 22, a limiting component 17 is also provided on the first connecting shaft. Specifically, the limiting component 17 includes a limiting step 171 located near the center of the first connecting shaft, and a limiting sleeve 172 is fitted onto the first connecting shaft, abutting against the limiting step 171. The first clamping plate 21 is limited by the baffle 18 and the limiting sleeve 172, and the second clamping plate 22 is limited by the limiting step 171.

[0056] Example 2

[0057] This embodiment is similar to Embodiment 1, except that, as Figure 1 , Figure 2 and 10 As shown, in this embodiment, the extrusion welding gun 5 includes an extrusion welding gun body 51 connected to the connecting part 13, a heating extrusion cylinder 52 connected to the extrusion welding gun body 51, and a wire feeding tube 53 connected to the heating extrusion cylinder 52. The extrusion end of the heating extrusion cylinder 52 faces the end face coating device. The extrusion welding gun 5 also includes a hot air tube 54, and the air outlet end of the hot air tube 54 faces the end face coating device.

[0058] like Figure 10As shown, the heating extrusion cylinder 52 is provided with an extrusion nozzle 521 for extruding the welding fluid, and an air outlet 522 for discharging air. The wire feeding tube 53 is connected to the extrusion nozzle 521 through the heating extrusion cylinder 52, and the hot air duct 54 is connected to the air outlet 522 through the heating extrusion cylinder 52. It should be noted that the extrusion welding gun body 51 and the heating extrusion cylinder 52 are existing technologies and will not be described in detail here.

[0059] Example 3

[0060] This embodiment is similar to Embodiment 1 or 2, except that, as Figures 11 to 12 As shown, in this embodiment, the pipe end sealing system also includes a clamping bracket 6 for clamping the pipe 7. The clamping bracket 6 is positioned near one end of the expansion fixing device 2. The clamping bracket 6 includes a first support arm 61, a second support arm 62, and a clamping strap 63. The first support arm 61 and the second support arm 62 are arranged crosswise, and the intersection of the first support arm 61 and the second support arm 62 is connected by a height adjustment structure 64. The two ends of the clamping strap 63 are detachably connected to the first support arm 61 and the second support arm 62, respectively. In this embodiment, the height adjustment structure 64 includes a plurality of first through holes arranged along a certain trajectory on the first support arm 61, and a plurality of second through holes arranged along a certain trajectory on the second support arm 62. The first support arm 61 and the second support arm 62 can be connected by bolts passing through the first through holes and the second through holes at different positions in sequence, thereby changing the cross position between the first support arm 61 and the second support arm 62, thereby adjusting the height of the clamping bracket 6 supporting the pipe 7, and then clamping the pipe 7 with the clamping strap 63, thereby supporting the pipe 7.

[0061] It should be noted that the first support arm 61 and the second support arm 62 can also be connected by a pivot, and the angle between the first support arm 61 and the second support arm 62 can be adjusted by the height adjustment structure 64, thereby realizing the height adjustment of the support position of the clamping bracket 6 on the pipe 7.

[0062] Example 4

[0063] like Figure 13 The illustration shows an embodiment of a pipe end-face sealing method according to the present invention, applied to the pipe end-face sealing system described in any one of embodiments 1 to 3, comprising the following steps:

[0064] S1. Sawing and cleaning the end face of pipe 7;

[0065] S2. Insert the expansion fixing device 2 into the pipe 7 until the coating end of the first abutting roller coating mechanism 3 and the coating end of the second abutting roller coating mechanism 4 abut against the inner ring and outer ring of the pipe 7 respectively, and both are close to the end face of the pipe 7.

[0066] S3. The movable clamping plate assembly is driven by the first guide drive unit 11 to extend into the expansion member 23. The expansion member 23 is interference-fitted with the movable clamping plate assembly. The expansion member 23 expands radially and fits tightly against the inner wall of the pipe 7, thus completing the fixation between the pipe 7 and the pipe end face sealing system.

[0067] S4. Start the extrusion welding gun 5 to extrude the welding fluid to the end face of the pipe 7, and rotate the connecting part 13 to make the first abutting roller coating mechanism 3 rotate circumferentially at the inner circle of the pipe 7 and the second abutting roller coating mechanism 4 rotate circumferentially at the outer circle of the pipe 7. The roller coating ends of the first abutting roller coating mechanism 3 and the second abutting roller coating mechanism 4 coat and seal the end face of the pipe 7 circumferentially. During the rotation, the outermost edge of the roller coating trajectory of the first abutting roller coating mechanism 3 is tangent or nearly tangent to the innermost edge of the roller coating trajectory of the second abutting roller coating mechanism 4.

[0068] S5. After the coating and sealing of the end face of the pipe 7 is completed, the movable clamping plate assembly is driven out of the expansion member 23 by the first guide drive unit 11. The expansion member 23 is separated from the inner wall of the pipe 7, and the expansion fixing device 2 is removed from the pipe 7.

[0069] Specifically, step S1 includes the following steps:

[0070] S11. Sawing and cleaning the end face of pipe 7;

[0071] S12. Use the clamping bracket 6 to support and fix the pipe 7; wherein the pipe 7 is placed between the first support arm 61 and the second support arm 62, and the pipe 7 is clamped by the clamping strap 63.

[0072] Specifically, step S2 includes the following steps:

[0073] S21. Insert the expansion fixing device 2 into the pipe, and then observe whether the rolling surface of the first roller 31 can abut against the inner ring of the pipe 7, whether the rolling surface of the second roller 43 can abut against the outer ring of the pipe 7, and whether the first roller 31 and the second roller 43 are in the same circumferential plane position; if all of the above are true, then proceed to step S23, otherwise proceed to step S22;

[0074] S22. Adjust the position of the first roller 31 through the first oblong hole so that the rolling surface of the first roller 31 abuts against the inner ring of the pipe 7; adjust the position of the second roller 43 through the second oblong hole 421 so that the rolling surface of the second roller 43 abuts against the outer ring of the pipe 7; adjust the position of the second roller 43 through the adjusting rod 41 so that the first roller 31 and the second roller 43 are in the same circumferential plane position, and then execute step S23;

[0075] S23. Slide the sleeve 131 along the direction towards the end face of the pipe 7 on the second connecting shaft until a gap of 1-3 mm is left between the first step structure 311 and the second step structure 431 and the end face of the pipe. Then limit the sleeve 131 in the axial direction by the limiting nut 15. It should be noted that at this time, the sleeve 131 can still drive the first abutting roller coating mechanism 3, the second abutting roller coating mechanism 4, and the extrusion welding gun 5 to rotate on the second connecting shaft. Then execute step S24. It should be noted that in step S23, the thickness of the coating on the end face of the pipe 7 can be controlled by the size of the gap.

[0076] Specifically, step S3 includes: rotating the handle 16 to drive the first connecting shaft to rotate, thereby driving the first clamping plate 21 to move closer to the second clamping plate 22, until both the first clamping plate 21 and the second clamping plate 22 are inserted into the expansion sleeve. At this time, the first clamping plate 21 and the expansion sleeve, and the second clamping plate 22 and the expansion sleeve are all interference fit. The expansion sleeve expands radially outward and fits tightly against the inner wall of the pipe 7, completing the fixation between the pipe end sealing system and the pipe 7, keeping the size of the gap reserved in step S23 unchanged, and avoiding affecting the reserved coating thickness. It should be noted that at this time, the second spring 242 is in a compressed state. Since the second clamping plate 22 has the abutment and limiting effect of the first spring 141 and the sleeve 131, the second clamping plate 22 can also achieve the limiting effect.

[0077] Specifically, step S4 includes the following steps:

[0078] S41. Feed the welding wire from the wire feeding tube 53 into the heated extrusion cylinder 52;

[0079] S42. Start the hot air duct 54. Hot air is blown through the air outlet 522 to the end face of the pipe 7 for preheating.

[0080] S43. The heating extrusion cylinder 52 is started to be heated by the extrusion welding gun body 51. The welding wire melts into a welding fluid and is extruded through the screw pressure roller inside the heating extrusion cylinder 42 to the gap position reserved in step S23 by the extrusion nozzle 521.

[0081] S44. Rotate the extrusion welding gun 4. Since the first contact roller coating mechanism 3 and the second contact roller coating mechanism 4 are both installed on the sleeve 131, the first roller 31 can roll along the inner circle of the pipe end face, and the second roller 43 can roll along the outer circle of the pipe end face. The outermost edge of the roller coating trajectory of the first step structure 311 is tangent or nearly tangent to the innermost edge of the roller coating trajectory of the second step structure 431, thus completing the uniform coating of the entire pipe end face.

[0082] Specifically, step S5 includes: rotating the handle 16 in the opposite direction, the first clamp 21 and the second clamp 22 gradually moving away from each other, and the first clamp 21 and the second clamp 22 can be quickly disengaged from the expansion sleeve by the elastic force of the second spring 242, the expansion sleeve is disengaged from the pipe 7, and the pipe end sealing system can be withdrawn from the pipe 7.

[0083] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A pipe end-face sealing system, characterized in that, It includes a guide drive device (1), and also includes an expansion fixing device (2), an end face roller coating device, and an extrusion welding gun (5) arranged in sequence, wherein the expansion fixing device (2), the end face roller coating device, and the extrusion welding gun (5) are all connected to the guide drive device (1); wherein: The guide drive device (1) includes a first guide drive part (11) and a second guide drive part (12) connected to the first guide drive part (11), and a connecting part (13) is rotatably connected to the second guide drive part (12); The expansion fixing device (2) includes a movable clamping plate assembly and an expansion member (23) disposed at the movable clamping plate assembly. The movable clamping plate assembly is connected to the first guide drive unit (11) for transmission. When the first guide drive unit (11) drives the expansion fixing device (2) to expand and fix, the movable clamping plate assembly extends into the expansion member (23) and is interference-fitted with the expansion member (23). The end face coating device includes a first contact coating mechanism (3) for contact coating of the inner ring of the pipe (7) and a second contact coating mechanism (4) for contact coating of the outer ring of the pipe (7). The first contact coating mechanism (3), the second contact coating mechanism (4), and the extrusion welding gun (5) are all connected to the connecting part (13). The extrusion end of the extrusion welding gun (5) faces the end face coating device.

2. The pipe end-face sealing system according to claim 1, characterized in that, The movable clamping plate assembly includes a first clamping plate (21) and a second clamping plate (22). The expansion member (23) is an expansion sleeve disposed between the first clamping plate (21) and the second clamping plate (22). The first clamping plate (21) is connected to the first guide drive unit (11) in a transmission connection, and the second clamping plate (22) is slidably connected to the first guide drive unit (11). An elastic reset assembly (24) is also provided between the first clamping plate (21) and the second clamping plate (22). When the first guide drive unit (11) is driven to extend the first clamp (21) and the second clamp (22) into the expansion sleeve, the first clamp (21) and the expansion sleeve, and the second clamp (22) and the expansion sleeve are both interference fits.

3. The pipe end sealing system according to claim 2, characterized in that, The cross-sectional areas of the first clamping plate (21) and the second clamping plate (22) gradually decrease from the end away from the expansion sleeve to the end closer to the expansion sleeve; the expansion sleeve includes a first accommodating section (231), a connecting section (232), and a second accommodating section (233) connected in sequence, and the cross-sectional areas of the first accommodating section (231) and the second accommodating section (233) gradually decrease from the end away from the connecting section (232) to the end closer to the connecting section (232); when the first clamping plate (21) and the second clamping plate (22) are inserted into the expansion sleeve, the first accommodating section (231) is in an interference fit with the first clamping plate (21), and the second accommodating section (233) is in an interference fit with the second clamping plate (22).

4. The pipe end-face sealing system according to claim 1, characterized in that, The first contact roller coating mechanism (3) includes a wheel frame (32) and a plurality of first rollers (31) connected to the wheel frame (32). The wheel frame (32) is connected to the connecting part (13). The first rollers (31) have a first step structure (311) on their rolling surface for contacting the end of the pipe (7).

5. The pipe end sealing system according to claim 4, characterized in that, The wheel frame (32) is provided with a radial adjustment structure (323), and the first roller (31) is connected to the wheel frame (32) through the radial adjustment structure (323).

6. The pipe end-face sealing system according to claim 1, characterized in that, The second contact roller coating mechanism (4) includes an adjusting rod (41), an adjusting seat (42), and a second roller (43). The rolling surface of the second roller (43) is provided with a second step structure (431) for contacting the end of the pipe (7). The second roller (43) is connected to the adjusting rod (41), and the adjusting rod (41) is slidably connected to the adjusting seat (42). The adjusting rod (41) can slide on the adjusting seat (42) along a first direction. The adjusting seat (42) is slidably connected to the connecting part (13), and the adjusting seat (42) can slide on the connecting part (13) along a second direction. The first direction and the second direction are perpendicular to each other.

7. The pipe end sealing system according to claim 1, characterized in that, The extrusion welding gun (5) includes an extrusion welding gun body (51) connected to the connecting part (13), a heating extrusion cylinder (52) connected to the extrusion welding gun body (51), and a wire feeding tube (53) connected to the heating extrusion cylinder (52). The extrusion end of the heating extrusion cylinder (52) faces the end face coating device. The extrusion welding gun (5) also includes a hot air cylinder (54), and the air outlet end of the hot air cylinder (54) faces the end face coating device.

8. The pipe end-face sealing system according to claim 1, characterized in that, The first guide drive part (11) includes a first connecting shaft, the second guide drive part (12) includes a second connecting shaft coaxially connected to the first connecting shaft, the connecting part (13) includes a sleeve structure, the sleeve structure is rotatably connected to the second connecting shaft through an elastic guide component (14), and the sleeve structure can also be slidably connected to the second connecting shaft through the elastic guide component (14); The movable end of the movable clamp assembly is connected to the first connecting shaft via a threaded drive. The first abutting roller coating mechanism (3), the second abutting roller coating mechanism (4), and the extrusion welding gun (5) are all connected to the sleeve structure.

9. The pipe end-face sealing system according to any one of claims 1 to 8, characterized in that, It also includes a clamping bracket (6) for clamping the pipe (7), the clamping bracket (6) being close to the expansion fixing device (2); wherein, the clamping bracket (6) includes a first support arm (61), a second support arm (62), and a clamping strap (63), the first support arm (61) and the second support arm (62) being arranged crosswise, and the intersection of the first support arm (61) and the second support arm (62) being connected by a height adjustment structure (64), and the two ends of the clamping strap (63) being detachably connected to the first support arm (61) and the second support arm (62) respectively.

10. A sealing method applied to the pipe end-face sealing system according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Sawing and cleaning the end face of the pipe (7); S2. Insert the expansion fixing device (2) into the pipe (7) until the coating end of the first abutting coating mechanism (3) and the coating end of the second abutting coating mechanism (4) abut against the inner and outer rings of the pipe (7) respectively, and both are close to the end face of the pipe (7). S3. Drive the movable clamping plate assembly to extend into the expansion member (23) through the first guide drive part (11). The expansion member (23) is interference-fitted with the movable clamping plate assembly. The expansion member (23) expands radially and fits tightly against the inner wall of the pipe (7), thus completing the fixation between the pipe (7) and the pipe end face sealing system. S4. Start the extrusion welding gun (5) to extrude the welding fluid to the end face of the pipe (7), and rotate the connecting part (13) to make the first abutting roller coating mechanism (3) rotate circumferentially at the inner circle of the pipe (7) and the second abutting roller coating mechanism (4) rotate circumferentially at the outer circle of the pipe (7). The roller coating ends of the first abutting roller coating mechanism (3) and the second abutting roller coating mechanism (4) coat and seal the end face of the pipe (7) circumferentially. During the rotation, the outermost edge of the roller coating trajectory of the first abutting roller coating mechanism (3) is tangent or nearly tangent to the innermost edge of the roller coating trajectory of the second abutting roller coating mechanism (4). S5. After the coating and sealing of the end face of the pipe (7) is completed, the movable clamping plate assembly is driven out of the expansion member (23) by the first guide drive part (11), the expansion member (23) is separated from the inner wall of the pipe (7), and the expansion fixing device (2) is removed from the pipe (7).

Images