Pipe joint grinding assembly device

Abstract

This invention relates to a pipe joint grinding assembly device, the inner tensioning device comprising an inner rotating shaft and a sleeve; an outer shaft tube is fixedly fitted onto the outside of the inner rotating shaft; the grinding device includes a telescopic frame, a transmission device, rubber rollers, and a grinding rod; the upper side wall of the telescopic frame facing the inner tensioning device is provided with a rubber roller connecting block for connecting the rubber rollers and a grinding rod fixing block for connecting the grinding rod; the transmission device is connected to the telescopic frame and the grinding rod respectively; the bottom of the telescopic frame is rotatably connected to the surface of the outer shaft tube; the switchable sleeve clamp includes a clamp sleeve and a clamp fixedly connected to one end of the clamp sleeve. The pipe joint grinding assembly device provided by this invention can improve construction efficiency, while reducing labor intensity, lowering safety hazards, and increasing the welding qualification rate of steel-reinforced PE pipes.

Description

Technical Field

[0001] This invention relates to the field of pipe assembly welding technology, and more specifically, to a pipe joint grinding and assembly device. Background Technology

[0002] Steel-reinforced PE pipes are increasingly being used in the construction of industries such as petrochemicals, coal chemicals, and wastewater treatment. Steel-reinforced PE pipes are a new type of environmentally friendly pipe material made by continuously extruding high-strength steel wire as the reinforcing skeleton and high-density polyethylene as the matrix, bonded together with hot melt adhesive. It retains the excellent pressure-bearing performance of steel pipes and the good hygienic properties of plastic pipes, and features reliable technology and a long service life. Furthermore, steel-reinforced PE pipes are lighter than carbon steel pipes, resistant to acids and alkalis, require no internal or external corrosion protection, and have good thermal insulation properties and low internal flow loss (0.22-0.47 microns).

[0003] In the construction of the coal chemical synthesis material base water resource fractionation crystallization comprehensive utilization (zero discharge) project undertaken by the applicant, steel-reinforced PE pipes were extensively used to replace traditional metal pipes. The current construction procedure is as follows: before welding the steel-reinforced PE pipes, the outer side of the pipes and the inner side of the fittings are ground evenly using grinding tools such as angle grinders. The pipes and fittings are then tied with steel wire ropes, and the pipes are tightened by the side of a tensioner to press the sockets together. Finally, a special welding machine for steel-reinforced PE pipes is used for welding.

[0004] The above construction methods have the following defects: Grinding steel-reinforced PE pipes and fittings requires one person to rotate the pipe while another uses an angle grinder or other grinding tools to evenly grind the outside of the pipe and the inside of the fitting. This is not only time-consuming and labor-intensive, but uneven grinding can also cause welding defects. Furthermore, before welding, the pipe and fitting need to be socketed. To ensure welding quality, the grinding is generally shallow. The socket connection uses steel wire rope to bind the pipe and fitting, and then tightens it from the side with a tensioner. However, binding straight pipes is time-consuming and labor-intensive, the pressing process is cumbersome, and there is a risk of rope slippage or lateral stress. On bent or inclined pipes, because the stress is not on a straight line, the socket pressing effect is deflected, resulting in uneven gaps between the pipe and fitting. This prevents the molten high-density polyethylene from evenly filling the weld, causing welding defects. Our on-site measurements revealed that welding a single joint typically takes 60-90 minutes. However, the actual welding time (taking DN500 as an example, the longest is 16 minutes, but we'll consider 20 minutes) only accounts for 1 / 3 to 1 / 5 of the total time. The pre-welding grinding process takes up 2 / 3 or even more of the construction time. Furthermore, the vibrations during the existing grinding process pose a safety hazard, and the grinding personnel, limited by their skills and physical abilities, will spend even more time, resulting in a decrease in construction efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a pipe joint grinding and assembly device, so as to improve the grinding, assembly and pressing efficiency of pipes, shorten the welding time of steel frame, and reduce the labor intensity of construction personnel.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0007] A pipe joint grinding assembly device includes a pipe grinding device and a clamping and pressing device; the pipe grinding device includes an internal tensioning device, a grinding device, and a switchable sleeve clamp.

[0008] The internal tensioning device includes an inner rotating shaft and a sleeve; an outer shaft tube is fixedly fitted on the outside of the inner rotating shaft, and multiple internal expansion arc plates are evenly arranged on the surface of the sleeve. A shaft fixing frame is provided at the front end of the sleeve, and the outer shaft tube is connected to the middle of the shaft fixing frame through a bearing I.

[0009] The grinding device includes a telescopic frame, a transmission device, rubber rollers, and a grinding rod; the upper part of the side wall of the telescopic frame facing the inward tensioning device is provided with a rubber roller connecting block for connecting the rubber rollers and a grinding rod fixing block for connecting the grinding rods; the transmission device is connected to the telescopic frame and the grinding rods respectively; the bottom of the telescopic frame is rotatably connected to the surface of the outer sleeve tube;

[0010] The switchable sleeve clamp includes a clamp sleeve and a clamp fixedly connected to one end of the clamp sleeve. The clamp is connected to a power source, and the clamp sleeve is selectively connected to a transmission device in the grinding device.

[0011] Furthermore, the internal tensioning device also includes a connecting rod disc with a square hole in the center. The front end of the inner rotating shaft is fixedly inserted into the square hole on the connecting rod disc. One end of the inner expansion plate is hinged to the surface of the sleeve, and a through hole is opened on the lower part of the sleeve surface of the inner expansion plate. The inner expansion plate and the connecting rod disc are connected by a connecting rod passing through the through hole. The connecting rod disc has the same number of pins as the inner expansion plate, and the line connecting the pins is located between the center of the connecting rod disc and the edge of the connecting rod disc. One end of the connecting rod is hinged to the lower surface of the inner expansion plate, and the other end is rotatably connected to the pin.

[0012] Furthermore, in the grinding device, the telescopic frame includes a telescopic inner frame and a telescopic outer frame; the telescopic inner frame and the telescopic outer frame are connected by a socket, and a tension spring is connected between the top of the telescopic outer frame and the middle or lower part of the telescopic inner frame, and a through hole is opened on the side wall of the telescopic outer frame for the tension spring to pass through.

[0013] Furthermore, in the grinding device, both the rubber roller and the grinding rod are mounted on the telescopic inner frame; the rubber roller connecting block includes an outer wall rubber roller guide slider mounted above the grinding rod fixing block and an inner wall rubber roller guide slider mounted below the grinding rod fixing block; the inner wall of the telescopic inner frame is provided with vertical slides that respectively cooperate with the outer wall rubber roller guide slider and the inner wall rubber roller guide slider; a compression spring I is connected between the outer wall rubber roller guide slider and the top of the telescopic inner frame, and a compression spring II is connected between the inner wall rubber roller guide slider and the bottom of the telescopic inner frame.

[0014] Furthermore, in the grinding device, the transmission mechanism includes a gear tube shaft, meshing gears, bevel gear I, bevel gear II, shaped gear I, and shaped gear II.

[0015] The telescopic outer frame is connected to an L-shaped fixing sleeve on the side. The vertical surface of the L-shaped fixing sleeve has a hole and a gear tube shaft is connected to the hole through a bearing. A gear is provided on the circumferential edge of one side of the gear tube shaft. The axial middle part of the gear tube shaft is installed on the outer shaft tube through a bearing.

[0016] The horizontal plane of the L-shaped fixing sleeve has an opening, and a vertical shaft is connected to the vertical shaft through a bearing inside the opening. The top of the vertical shaft is connected to bevel gear I. A gear shaft is installed inside the grinding rod fixing block through a bearing. One end of the gear shaft is connected to the grinding rod, and the other end of the gear shaft is connected to bevel gear II. Bevel gear I and bevel gear II mesh. The bottom of the vertical shaft is connected to a meshing gear, which meshes with the gear tube shaft.

[0017] The telescopic outer frame is connected to a special-shaped gear I. The middle part of special-shaped gear I is connected to the outer tube shaft through a bearing. Special-shaped gear I meshes with special-shaped gear II. Special-shaped gear II and the meshing gear at the bottom of the vertical shaft are fixed coaxially.

[0018] Furthermore, the clamp sleeve has two bolt holes, and positioning bolt I and positioning bolt II are respectively connected to the two bolt holes; the rear end of the gear tube shaft has a threaded hole for connecting with positioning bolt I, and the rear end of the inner rotating shaft has a threaded hole for connecting with positioning bolt II.

[0019] Furthermore, the clamping and pressing device includes a first clamping sleeve and a second clamping sleeve that are respectively connected to two interface pipes. The first clamping sleeve has sliding sleeves on both sides, and the second clamping sleeve has fixed sleeves on both sides. A connecting rod connects the sliding sleeves and fixed sleeves of the first and second clamping sleeves. A rack is provided on the outside of the connecting rod. A gear that meshes with the rack is provided on the first clamping sleeve. The gear shaft of the gear is connected to an electric drill.

[0020] Furthermore, the clamping sleeve includes two semi-circular ring-shaped rubber bushings, the two ends of which are connected by bolts.

[0021] Compared with existing steel-reinforced PE pipe construction methods, the device described in this invention allows for more efficient pipe wall grinding. First, the internal tensioning device is fixed to the inner wall of the pipe. The grinding device is then installed on the outer sleeve of the internal tensioning device. When grinding the outer wall, the grinding rod is placed against the outer wall of the pipe to be ground, and the rubber roller is against the inner wall. When grinding the inner wall, the grinding rod is placed against the inner wall of the pipe to be ground, and the rubber roller is against the outer wall. After connecting the clamp to the electric drill, the clamp sleeve is connected to the inner rotating shaft. The electric drill is turned on and rotated clockwise to tighten the inner expansion plate against the inner wall of the pipe. Then, the clamp sleeve is connected to the gear shaft, and the electric drill is turned on. The transmission device drives the telescopic frame and grinding rod to rotate. Depending on the required grinding range, the grinding rod rotates along the inner or outer wall of the pipe for 30-60 seconds until the inner wall of the fitting is ground. Finally, the inner and outer wall grinding devices are removed, and the inner and outer wall grinding is complete. This device improves efficiency, reduces labor intensity, and lowers safety hazards.

[0022] After grinding, use a brush or air pump to clean away the sand or debris. Fix the two clamping sleeves of the mechanical clamping and pressing assembly to the pipe fittings. Connect the drill to the gear shaft, turn on the drill, and the connecting rod will pull the two clamping sleeves to move in opposite directions, thus achieving the socket pressing of the pipe fittings. Compared with traditional wire rope tensioning, this method is more efficient and faster, and the socket pressing force is more uniform, greatly improving work efficiency and pressing quality. The uniform circumferential pressing also provides excellent conditions for welding fusion.

[0023] In summary, compared with existing steel frame construction technologies, the pipe interface grinding and assembly device provided by this invention can improve construction efficiency, while reducing labor intensity, lowering safety hazards, and increasing the welding qualification rate of steel frame PE pipes. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the pipe grinding device described in this invention.

[0025] Figure 2 This is a schematic diagram of the clamping and pressing device described in this invention.

[0026] In the diagram, 1-inner tensioning device, 101-outer shaft tube, 102-sleeve, 103-inner expansion plate, 104-inner rotating shaft, 104-1 square end, 104-2 round end, 105-bearing I, 106-connecting rod, 107-connecting rod disc; 2-grinding device, 201-rubber roller, 202-grinding rod, 203-1-outer wall rubber roller guide slider, 203-2-grinding rod fixing block, 203-3-inner wall rubber roller guide slider, 204-1-compression spring I, 204-2-compression spring II, 205-1 bevel gear II, 205-2-bearing IV, 205-3-gear shaft, 206-1-bevel gear I, 206-2-vertical shaft fixing sleeve II, 206-3-vertical shaft bearing, 206- 4 Upper vertical shaft, 207-1 Telescopic inner frame, 207-2 Telescopic outer frame, 207-3 Tension spring, 207-4 Fixing bolt I, 208-1 Vertical shaft fixing sleeve I, 208-2 Lower vertical shaft, 208-3 Bearing III, 208-4 Meshing gear, 208-5 Special-shaped gear II, 208-6 L-shaped fixing sleeve, 208-7 Bearing II, 209-1 Fixing bolt II, 209-2 Special-shaped gear I, 3-1 Gear tube shaft, 3-2 Bearing V; 3-3 Bearing VI; 3-4 Clamp handle tube sleeve; 3-5 Clamp handle; 3-6 Positioning bolt I; 3-7 Positioning bolt II; 4 First clamping sleeve, 5 Second clamping sleeve, 6 Sliding sleeve, 7 Fixed sleeve, 8 Connecting rod, 9 Gear, 10 Bolt. Detailed Implementation

[0027] A typical embodiment of the present invention provides a pipe interface grinding assembly device, including a pipe grinding device and a clamping and pressing device; the pipe grinding device includes an internal tensioning device, a grinding device, and a switchable sleeve clamp.

[0028] like Figure 1 As shown, the internal tensioning device 1 includes an inner rotating shaft 104 and a sleeve 102; an outer shaft tube 101 is fixedly fitted on the outside of the inner rotating shaft 104, and multiple inner expansion arc plates 103 are evenly arranged on the surface of the sleeve 102. A shaft fixing frame is provided at the front end of the sleeve 102, and the outer shaft tube 101 is connected to the middle of the shaft fixing frame through a bearing I105.

[0029] The inner rotating shaft 104 has a square end 104-1 and a round end 104-2 at its two ends, respectively. The square end 104-1 is connected to the square hole on the connecting rod disc 107. The round end 104-2 on the inner rotating shaft 104 is connected to or disconnected from the clamp sleeve 3-4 by a wing bolt 3-6.

[0030] The grinding device includes a telescopic frame 207, a transmission device, a rubber roller 201, and a grinding rod 202; the upper part of the side wall of the telescopic frame 207 facing the inner tensioning device 1 is provided with a rubber roller connecting block for connecting the rubber roller 201 and a grinding rod fixing block 203-2 for connecting the grinding rod 202; the transmission device is connected to the telescopic frame 207 and the grinding rod 202 respectively; the bottom of the telescopic frame 207 is rotatably connected to the surface of the outer sleeve tube 101.

[0031] The switchable sleeve clamp includes a clamp sleeve 3-4 and a clamp 3-5 fixedly connected to one end of the clamp sleeve 3-4. The clamp 3-5 is connected to a power source, and the clamp sleeve 3-4 is selectively connected to the transmission device in the grinding device 2.

[0032] The internal tensioning device 1 further includes a connecting rod disc 107, with a square hole in the center of the connecting rod disc 107. The front end of the inner rotating shaft 104 is fixedly inserted into the square hole on the connecting rod disc 107. One end of the inner expansion arc plate 103 is hinged to the surface of the sleeve 102, and a through hole is opened on the surface of the sleeve 102 at the lower part of the inner expansion arc plate 103. The inner expansion arc plate 103 and the connecting rod disc 107 are connected by a connecting rod 106 passing through the through hole. The connecting rod disc 107 has the same number of pins as the inner expansion arc plate 103, and the line connecting each pin is located between the center of the connecting rod disc 107 and the edge of the connecting rod disc 107. The length of the connecting rod 106 is greater than the radius of the connecting rod disc 107. One end of the connecting rod 106 is hinged to the lower surface of the inner expansion arc plate 103, and the other end of the connecting rod 106 is rotatably connected to the pin.

[0033] In the grinding device 2, the telescopic frame includes a telescopic inner frame 207-1 and a telescopic outer frame 207-2; the telescopic inner frame 207-1 and the telescopic outer frame 207-2 are connected by a socket joint, with the telescopic inner frame 207-1 located on top of the telescopic outer frame 207-2. A tension spring 207-3 is connected between the top of the telescopic outer frame 207-2 and the middle or lower part of the telescopic inner frame 207-1, and a through hole is provided on the side wall of the telescopic outer frame 207-2 for the tension spring 207-3 to pass through.

[0034] A detachable fixing bolt I207-4 is connected between the telescopic inner frame 207-1 and the telescopic outer frame 207-2, which is used to fix the telescopic inner frame 207-1 and the telescopic outer frame 207-2 after the position of the telescopic frame is adjusted.

[0035] The telescopic outer frame 207-1 is equipped with a fixing bolt II on its side. The front end of the fixing bolt II passes through the telescopic outer frame 207-1 and can lock the outer sleeve tube 101 when necessary.

[0036] In the grinding device 2, both the rubber roller 201 and the grinding rod 202 are mounted on the telescopic inner frame 207-1. The rubber roller connecting block includes an outer wall rubber roller guide slider 203-1 mounted above the grinding rod fixing block 203-2 and an inner wall rubber roller guide slider 203-3 mounted below the grinding rod fixing block 203-2. The inner wall of the telescopic inner frame 207-1 is provided with vertical slides that cooperate with the outer wall rubber roller guide slider 203-1 and the inner wall rubber roller guide slider 203-3 respectively. A compression spring I204-1 is connected between the outer wall rubber roller guide slider 203-1 and the top of the telescopic inner frame 207-1, and a compression spring II204-2 is connected between the inner wall rubber roller guide slider 203-3 and the bottom of the telescopic inner frame.

[0037] The grinding device includes a transmission mechanism comprising a gear tube shaft 3-1, meshing gears, bevel gear I, bevel gear II, shaped gear I, and shaped gear II.

[0038] The telescopic outer frame 207-2 is connected to an L-shaped fixing sleeve 208-6 on its side. The L-shaped fixing sleeve 208-6 has a hole on its vertical surface and a gear tube shaft 3-1 is connected to the gear tube shaft 3-1 through the bearing in the hole. A gear is provided on the circumferential edge of one side of the gear tube shaft 3-1. The axial middle part of the gear tube shaft 3-1 is installed on the outer shaft tube 101 through the bearing II208-7.

[0039] The L-shaped fixing sleeve 208-6 has a horizontal opening and is connected to the vertical shaft through the bearing III 208-3 inside the opening. The top of the vertical shaft is connected to the bevel gear I 206-1. The grinding rod fixing block 203-2 has a gear shaft 205-3 installed inside through the bearing IV 205-2. One end of the gear shaft 205-3 is connected to the grinding rod 202, and the other end of the gear shaft 205-3 is connected to the bevel gear II 205-1. The bevel gear I 206-1 meshes with the bevel gear II 205-1. The bottom of the vertical shaft is connected to the meshing gear 208-4, which meshes with the gear tube shaft 3-1.

[0040] More specifically, the telescopic outer frame 207-2 has a vertical shaft fixing sleeve I208-1 on its side. The vertical shaft passes through the bearing in the middle of the vertical shaft fixing sleeve I208-1. The upper vertical shaft of the vertical shaft fixing sleeve 208-1 is the upper vertical shaft 206-4, and the lower vertical shaft is the lower vertical shaft 208-2. The telescopic inner frame 207-1 has a vertical shaft fixing sleeve II206-2 on its side. The vertical shaft fixing sleeve II206-2 has a vertical shaft bearing 206-3 in the middle. The upper vertical shaft 206-4 passes through the vertical shaft bearing 206-3.

[0041] The telescopic outer frame 207-2 is connected to the inner side of the special gear I209-2. The middle part of the special gear I209-2 is connected to the outer sleeve shaft 101 through a bearing. The special gear I209-2 meshes with the special gear II208-5. The special gear II208-5 and the meshing gear 208-4 at the bottom of the vertical shaft are coaxially fixed.

[0042] The clamp sleeve 3-4 has two bolt holes, and positioning bolts I3-6 and II3-7 are connected to the two bolt holes respectively; the rear end of the tube wall of the gear tube shaft 3-1 has a threaded hole for connecting with positioning bolt I3-6, and the rear end of the inner rotating shaft 104 has a threaded hole for connecting with positioning bolt II3-7.

[0043] like Figure 2 As shown, the clamping and pressing device includes a first clamping sleeve 4 and a second clamping sleeve 5 that are respectively connected to two interface pipes. The first clamping sleeve 4 has sliding sleeves 6 on both sides, and the second clamping sleeve 6 has fixed sleeves 7 on both sides. A connecting rod 8 connects the sliding sleeves 6 and fixed sleeves 7 of the first clamping sleeve 4 and the second clamping sleeve 5. A rack is provided on the outside of the connecting rod 8. A gear 9 that meshes with the rack is provided on the first clamping sleeve 4. The gear shaft of the gear 9 is connected to an electric drill.

[0044] The clamping sleeve includes two semi-circular ring-shaped rubber liner plates, and the two ends of the two rubber liner plates are connected by bolts 10.

[0045] The following uses a steel-reinforced PE pipe assembly as an example to illustrate the usage process of this invention.

[0046] Before constructing the steel-reinforced PE pipeline, determine the specifications (outer diameter) of the steel-reinforced pipeline and manufacture the corresponding mechanical clamping and pressing assembly device according to its outer diameter.

[0047] Grinding the inner wall of the pipe: Tighten the rubber roller 201 to the outer wall rubber roller guide slider 203-1, raise the end of the pipe / fitting to be ground, insert the inner tensioning device 1 into the pipe, and press the telescopic inner frame 207-1 so that the pipe wall is in the gap between the rubber roller 201 and the grinding rod 202 of the grinding device, tighten the positioning bolt II3-7, loosen the positioning bolt I3-6, use an electric drill to hold the clamp handle 3-5 and rotate it clockwise, drive the connecting rod disc 107 through the inner rotating shaft 104 to make the inner expansion arc plate 103 on the inner tensioning device 1 expand to the inner wall of the pipe. Then loosen the fixing bolt II3-7 and tighten the fixing bolt I3-6. Turn the electric drill clockwise. The grinding rod 202 and the telescopic frame are driven by the clamp sleeve 3-4, gear tube shaft 3-1, meshing gear 208-4, and special gear 208-5. The grinding rod 202 rotates at high speed through the gear system of meshing gear 208-4, bevel gear I206-1, and bevel gear II205-1. The special gear I209-2 connected to the telescopic frame 207-2 slowly drives the telescopic inner frame 207-1, telescopic inner frame 207-2, and rubber roller 201 to rotate circumferentially along the pipe wall through the special gear II208-5. The grinding rod 202 rotates at high speed along the inner wall of the pipe to grind the inner wall of the pipe.

[0048] Grinding the outer wall of the pipe: Unscrew the rubber roller 201 from the outer wall rubber roller guide slider 203-1, tighten it with the inner wall rubber roller guide slider 203-3, raise the end of the pipe / fitting to be ground, insert the inner tensioning device 1 into the pipe, and press the telescopic inner frame 207-1 so that the pipe wall is in the gap between the grinding rod 202 and the rubber roller 201 of the grinding device. Tighten the positioning bolt II3-7 and loosen the positioning bolt I3-6. Use an electric drill to hold the clamp handle 3-5 and rotate it clockwise. Drive the connecting rod disc 107 through the inner rotating shaft 104 to make the inner expansion arc plate 103 on the inner tensioning device 1 expand to the inner wall of the pipe. Then loosen the fixing bolt II3-7 and tighten the fixing bolt I3-6. Turn the electric drill clockwise. The grinding rod 202 and the telescopic frame are driven by the clamp sleeve 3-4, gear tube shaft 3-1, meshing gear 208-4, and special gear 208-5. The grinding rod 202 rotates at high speed through the gear system of meshing gear 208-4, bevel gear I206-1, and bevel gear II205-1. The special gear I209-2 connected to the telescopic frame 207-2 slowly drives the telescopic inner frame 207-1, telescopic inner frame 207-2, and rubber roller 201 to rotate around the pipe wall. The grinding rod rotates at high speed along the outer wall of the pipe to grind the outer wall of the pipe.

[0049] After the inner and outer walls are polished, clean the polished areas with a brush or air pump.

[0050] Place the first clamping sleeve 4 and the second clamping sleeve 5 onto the two steel-framed PE pipes that need to be butt-welded, staggering them by 50mm from the socket weld line, and tighten the bolts 10. Then, install the two ends of the connecting rod 8 into the sliding sleeve 6 and the fixed sleeve 7, respectively, with one end of the sliding sleeve 6 being the movable end and one end of the fixed sleeve 7 being the fixed end. Clamp the shaft of the gear 9 with an electric drill, turn on the electric drill, and drive the gear 9 counterclockwise to press the pipe fittings together.

[0051] After the pipe fittings are pressed together, confirm the welding conditions and welding process, connect the welding line, and take appropriate sun protection and wind protection measures (for temperatures of -5℃ to 40℃, heat preservation or cooling measures are required). Weld according to the welding process (four stages: preheating, interval time, welding time, and cooling time). After making records, open and remove the mechanical clamping and pressing assembly device to complete the fusion welding.

Claims

1. A pipe joint grinding assembly device, comprising a pipe grinding device and a clamping and pressing device; characterized in that: The pipe grinding device includes an internal tensioning device, a grinding device, and a switchable sleeve clamp; The internal tensioning device includes an inner rotating shaft and a sleeve; an outer shaft tube is fixedly fitted on the outside of the inner rotating shaft, and multiple internal expansion arc plates are evenly arranged on the surface of the sleeve. A shaft fixing frame is provided at the front end of the sleeve, and the outer shaft tube is connected to the middle of the shaft fixing frame through a bearing I. The grinding device includes a telescopic frame, a transmission device, rubber rollers, and a grinding rod; the upper part of the side wall of the telescopic frame facing the inward tensioning device is provided with a rubber roller connecting block for connecting the rubber rollers and a grinding rod fixing block for connecting the grinding rods; the transmission device is connected to the telescopic frame and the grinding rods respectively; the bottom of the telescopic frame is rotatably connected to the surface of the outer sleeve tube; The switchable sleeve clamp includes a clamp sleeve and a clamp fixedly connected to one end of the clamp sleeve. The clamp is connected to a power source, and the clamp sleeve is selectively connected to a transmission device in the grinding device. In the grinding device, the telescopic frame includes a telescopic inner frame and a telescopic outer frame; the telescopic inner frame and the telescopic outer frame are connected by a socket, and a tension spring is connected between the top of the telescopic outer frame and the middle or lower part of the telescopic inner frame; a through hole is opened on the side wall of the telescopic outer frame for the tension spring to pass through. In the grinding device, both the rubber roller and the grinding rod are mounted on the telescopic inner frame. The rubber roller connecting block includes an outer wall rubber roller guide slider located above the grinding rod fixing block and an inner wall rubber roller guide slider located below the grinding rod fixing block. The inner wall of the telescopic inner frame is provided with vertical slides that respectively cooperate with the outer wall rubber roller guide slider and the inner wall rubber roller guide slider. A compression spring I is connected between the outer wall rubber roller guide slider and the top of the telescopic inner frame, and a compression spring II is connected between the inner wall rubber roller guide slider and the bottom of the telescopic inner frame. The grinding device includes a transmission mechanism comprising a gear tube shaft, meshing gears, bevel gear I, bevel gear II, shaped gear I, and shaped gear II. The telescopic outer frame is connected to an L-shaped fixing sleeve on the side. The vertical surface of the L-shaped fixing sleeve has a hole and a gear tube shaft is connected to the hole through a bearing. A gear is provided on the circumferential edge of one side of the gear tube shaft. The axial middle part of the gear tube shaft is installed on the outer shaft tube through a bearing. The horizontal plane of the L-shaped fixing sleeve has an opening, and a vertical shaft is connected to the vertical shaft through a bearing inside the opening. The top of the vertical shaft is connected to bevel gear I. A gear shaft is installed inside the grinding rod fixing block through a bearing. One end of the gear shaft is connected to the grinding rod, and the other end of the gear shaft is connected to bevel gear II. Bevel gear I and bevel gear II mesh. The bottom of the vertical shaft is connected to a meshing gear, which meshes with the gear tube shaft. The telescopic outer frame is connected to a special-shaped gear I. The middle part of special-shaped gear I is connected to the outer tube shaft through a bearing. Special-shaped gear I meshes with special-shaped gear II. Special-shaped gear II and the meshing gear at the bottom of the vertical shaft are fixed coaxially.

2. The pipe joint grinding assembly device according to claim 1, characterized in that: The internal tensioning device further includes a connecting rod disc with a square hole in its center. The front end of the inner rotating shaft is fixedly inserted into the square hole on the connecting rod disc. One end of the inner expansion plate is hinged to the surface of the sleeve, and a through hole is opened on the lower part of the sleeve surface of the inner expansion plate. The inner expansion plate and the connecting rod disc are connected by a connecting rod passing through the through hole. The connecting rod disc has the same number of pins as the inner expansion plate, and the line connecting the pins is located between the center of the connecting rod disc and the edge of the connecting rod disc. One end of the connecting rod is hinged to the lower surface of the inner expansion plate, and the other end is rotatably connected to the pin.

3. The pipe joint grinding assembly device according to claim 2, characterized in that: The clamp sleeve has two bolt holes, and positioning bolt I and positioning bolt II are respectively connected in the two bolt holes; the rear end of the gear tube shaft has a threaded hole for connecting with positioning bolt I, and the rear end of the inner rotating shaft has a threaded hole for connecting with positioning bolt II.

4. The pipe joint grinding assembly device according to claim 1 or 3, characterized in that: The clamping and pressing device includes a first clamping sleeve and a second clamping sleeve that are respectively connected to two interface pipes. The first clamping sleeve has sliding sleeves on both sides, and the second clamping sleeve has fixed sleeves on both sides. A connecting rod connects the sliding sleeves and fixed sleeves of the first and second clamping sleeves. A rack is provided on the outside of the connecting rod. A gear that meshes with the rack is provided on the first clamping sleeve. The gear shaft of the gear is connected to an electric drill.

5. The pipe joint grinding assembly device according to claim 4, characterized in that: The first clamping sleeve and the second clamping sleeve include two semi-circular ring-shaped rubber liner plates, and the two ends of the two rubber liner plates are connected by bolts.

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