Pipeline butt joint weld reinforcement polishing device and polishing method

Abstract

The invention discloses a pipeline butt joint welding seam surplus height grinding device and method, the grinding device comprises an electric control module, a vehicle body module and a milling and grinding device module, and the appearance of a main body of the grinding device is of a cuboid trolley structure with an n-shaped handheld handle on the upper portion; the vehicle body module comprises a vehicle body shell, a lifting hand wheel hole and a metal magnetic wheel; the electric control module is located on the upper portion of the vehicle body module and provides power for the grinding device and controls electrical equipment. The milling and grinding device module is located in a vehicle body shell of the vehicle body module and comprises a lifting hand wheel, a speed reducer, a motor, a frame body and a spiral milling cutter. The grinding device makes contact with a to-be-treated pipeline through the metal magnetic wheel, the position of the milling and grinding device module is controlled by rotating the lifting hand wheel, then the carry distance of the spiral milling cutter is controlled, and the purpose of milling and grinding the weld reinforcement is achieved. The device is compact in structure, convenient to carry, simple in structure, low in use and maintenance cost and easy to operate, and the grinding speed and quality are improved.

Description

Technical Field

[0001] The invention relates to a grinding device and a grinding method for the excess height of a pipe butt joint weld, which are suitable for grinding the excess height of a pipe butt joint weld and a plate butt joint weld, and belong to the field of mechanical equipment manufacturing. Background Art

[0002] "NB / T47013.3-2023 Nondestructive Testing of Pressure Equipment Part 3: Ultrasonic Testing" clearly stipulates: During Class B testing, if the welded joint is limited by environmental conditions or its own structure and can only be tested on one side or one side, the excess height of the welded joint on the test surface should be ground flat. At this time, the probe movement area should include the entire width of the welded joint, that is, the probe should be scanned and tested directly above the weld.

[0003] In the power industry and petrochemical industry, there are many pipe butt joints with straight pipes and elbows. Especially in power plant unit projects, most pipe butt joints are straight pipes with elbows without straight sections. The straight pipe section on one side of the welded joint can be normally ultrasonically scanned, while the curvature of the pipe surface on the other side of the elbow varies greatly, and the movable detection area of ​​the ultrasonic probe is limited, so it is impossible to implement a comprehensive scan. According to the current standard requirements, the weld height of the pipe butt joint needs to be ground flat. For this reason, the work of grinding the weld height of the pipe welding joint has increased dramatically, and the workload is unprecedentedly huge. Since most pressure pipes are made of high alloy materials, the weld hardness is high, the grinding is difficult, and there are many types of pipe specifications and no special grinding devices. Conventional grinders are usually installed with grinding wheels and manually polished on site. This method has uneven grinding surfaces, poor grinding quality, and poor ultrasonic detection coupling effect. In addition, this method has a slow grinding speed. It usually takes 2-3 days to grind a weld. The labor cost has increased sharply, which has increased the investment in engineering funds and seriously affected the project schedule. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a portable weld excess height grinding device and grinding method which are simple in structure and easy to use in view of the defects in the prior art.

[0005] In order to solve this technical problem, the present invention provides a pipeline butt joint weld excess height grinding device, including an electric control module, a car body module and a milling device module. The main body shape is a rectangular trolley structure with an "n"-shaped hand-held handle on the upper part; the car body module includes a car body shell, a lifting hand wheel hole and a metal magnetic wheel, and two rows of metal magnetic wheels are arranged at the lower part of the car body shell, and a lifting hand wheel hole is processed at the center of the upper surface; the electric control module is located at the upper part of the car body module, provides power for the grinding device and controls the electrical equipment; the milling device module is located inside the car body shell of the car body module, and includes a lifting hand wheel, a reducer, a motor, a frame and a spiral milling cutter, the motor is connected to the reducer and installed at the rear of the frame, the front end of the transmission shaft on both sides of the reducer is installed with a bevel gear 1, and the rear end of the central axis of the spiral milling cutter is provided with a bevel gear 2, the bevel gear 1 and the bevel gear 2 are meshed with each other, and the rotation of the motor drives the spiral milling cutter to rotate; the threaded rod at the lower part of the lifting handwheel passes through the lifting handwheel hole on the upper surface of the vehicle body shell and is connected to the reducer; the grinding device contacts with the pipeline to be processed through the metal magnetic wheel and is firmly adsorbed on the surface of the pipeline to be processed, and the position of the milling device module inside the vehicle body module can be controlled by rotating the lifting handwheel, thereby controlling the advance distance of the spiral milling cutter, so as to achieve the purpose of controlling the excess height depth of the milling weld.

[0006] The electric control module has an "n" shape, and its upper crossbeam is a handle. A square LED display screen is provided at the front end of the handle to display the battery power and motor speed; a frustum-shaped speed control knob is provided at the rear of the display screen, which can control the start and stop of the motor, and can also adjust the motor speed by adjusting the duty cycle of the square wave signal.

[0007] A rectangular battery compartment is provided at the lower rear end of the handle, and the battery is inserted into the battery compartment from one side. A toggle battery locking switch is provided on the upper part of the battery. After the battery is inserted into the predetermined position, the battery locking switch is toggled to lock the battery; a circular plug-in power interface is provided on one side of the battery compartment, which can be used for on-board charging of the battery or directly powering the grinding device through an external power adapter.

[0008] The vehicle body shell is in the shape of a rectangular parallelepiped, with a trapezoidal groove on its inner wall, two rows of metal magnetic wheels on the lower part, three coaxial metal magnetic wheels on each row, and a lifting handwheel hole on the center of the upper surface of the vehicle body shell, which is a threaded hole.

[0009] The metal magnetic wheels are highly magnetic, and the six metal magnetic wheels are in contact with the pipe to be processed at the same time, so that the grinding device is firmly adsorbed on the surface of the pipe to be processed; the metal magnetic wheels can rotate along the wheel axle, thereby realizing the circumferential movement of the grinding device on the surface of the pipe to be processed.

[0010] The frame is made of aluminum alloy steel and is provided with trapezoidal protrusions on both sides. The two trapezoidal protrusions match the trapezoidal grooves on the inner wall of the vehicle body shell. The trapezoidal protrusions of the frame can move smoothly inside the trapezoidal grooves on the inner wall of the vehicle body shell to ensure that the milling device module moves vertically up and down inside the vehicle body module without deviation.

[0011] The milling device module also includes a guard plate and screws. The guard plate is located in front of the spiral milling cutter and is fixed to the front end of the frame by screws on both sides. When replacing the spiral milling cutter, the screws are removed and the spiral milling cutter is pulled out for replacement. After the replacement is completed, the guard plate is installed and the screws on both sides are tightened.

[0012] The milling device module also includes bearings. Bearings are installed at both ends of the spiral milling cutter. The bearing at one end is embedded in the frame, and the bearing at the other end is embedded in the front guard plate. The bearings at both ends are used to reduce the rotation friction of the central axis of the spiral milling cutter. The spiral milling cutter and the bearings are both arranged at the front of the frame.

[0013] The present invention also provides a method for grinding the weld excess height using the above-mentioned pipe butt joint weld excess height grinding device, which is characterized by comprising the following steps:

[0014] 1) Measure the diameter of the pipe to be processed and the height of the weld seam of the pipe butt joint, rotate the lifting hand wheel to unscrew the lower threaded rod, drive the milling device module to rise inside the car body module, and make the spiral milling cutter not contact the weld seam of the pipe butt joint;

[0015] 2) Hold the handle and place the grinding device on the outer surface of the pipe to be processed, ensuring that the spiral milling cutter is located directly above the excess height of the weld of the pipe butt joint. The six metal magnetic wheels are tightly adsorbed on the outer surface of the pipe to be processed and can be flexibly rotated, so that the grinding device can move smoothly along the circumferential direction on the outer surface of the pipe to be processed;

[0016] 3) Turn the speed knob to select the corresponding speed according to the hardness of the weld seam of the pipe butt joint, and turn the lifting handwheel to slowly move the milling device module downward until the spiral milling cutter contacts the weld seam of the pipe butt joint;

[0017] 4) According to the hardness of the weld, rotate the lifting handwheel again to lower the milling and grinding device module by 1mm to 2mm: when the weld excess hardness of the pipe butt joint is high, select a smaller spiral milling cutter to lower the distance; when the weld excess hardness of the pipe butt joint is low, select a larger spiral milling cutter to lower the distance; then stop turning the lifting handwheel, at this time, hold the handle and slowly push and pull the grinding device back and forth along the outer surface of the pipe to be processed, and grind the weld excess of the pipe butt joint in sections until the spiral milling cutter is no longer strained, indicating that the weld excess of the pipe butt joint under this advance distance has been milled.

[0018] 5) Repeat the above steps until the excess height of the weld of the pipe butt joint is completely milled, turn the speed knob to turn off the motor, remove the grinding device by the carrying handle, and complete all the grinding work.

[0019] Beneficial effects: the present invention adopts a large torque motor, and the spiral milling cutter has a stable rotation speed. The milling cutter rotation speed can be flexibly adjusted according to the hardness of the welding joint, the specific size, etc., the operation is simple, the grinding speed is fast, and the grinding efficiency is high; a milling and grinding device module height adjustment mechanism is designed, and the milling cutter advance distance is adjusted by turning the lifting handwheel, and the milling cutter rotation speed can be flexibly adjusted by using the speed regulating knob, and the weld excess height milling and grinding are integrated into one, no other processing is required, and the grinding quality is high; its lower part is processed into an arc surface, which has a wide range of applications and can be used for the weld excess height grinding of butt joints of pipes with different diameters, and can also be used for the weld excess height grinding of flat-plate butt joints; modular design is adopted, and each module is easy to disassemble and assemble, which is convenient for later maintenance and replacement of accessories, and the manufacturing cost and use cost are low. At the same time, the grinding head can also be replaced to replace the spiral milling cutter to realize the integrated operation of weld grinding and parent material grinding, with good process applicability, strong versatility and high economic benefits; the structure is single-sided grinding, which can realize the weld excess height grinding of straight pipe and straight pipe butt joints, and can also realize the weld excess height grinding of straight pipe and elbow butt joints.

[0020] The present invention has a compact structure, each module device is small in size, and is battery-powered, easy to carry, safe and reliable, and is particularly suitable for engineering projects at high altitudes, in narrow spaces, and in complex construction environments; it has a simple structure, low use and maintenance costs, and is easy to operate. Compared with manual grinding with existing grinders, the grinding speed and grinding quality are greatly improved, and the grinding cost is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the overall structure of the present invention from the bottom perspective;

[0023] Figure 3 It is a schematic diagram of the structural decomposition of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the electric control module of the present invention;

[0025] Figure 5 It is a structural schematic diagram of a vehicle body module of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the milling device module of the present invention;

[0027] Figure 7 It is a schematic diagram of the field application of the present invention.

[0028] In the figure: 1. Electronic control module; 2. Vehicle body module; 3. Milling device module; 4. Pipe to be processed; 5. Pipe joint weld excess height; 11. Handle; 12. Display screen; 13. Speed ​​knob; 14. Battery lock switch; 15. Indicator light; 16. Power interface; 17. Battery; 21. Vehicle body shell; 22. Lifting hand wheel hole; 23. Metal magnetic wheel; 31. Lifting hand wheel; 32. Reducer; 321. Bevel gear 1; 33. Motor; 34. Frame; 36. Spiral milling cutter; 361. Bevel gear 2; 37. Bearing; 38. Guard plate; 39. Screw. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0030] like Figure 1-Figure 7 As shown, the present invention provides a pipeline butt joint weld excess height grinding device, including an electric control module 1, a body module 2 and a milling device module 3. The main body is a rectangular trolley structure with an "n"-shaped hand-held handle 11 on the upper part, which is convenient for personnel to hold and carry; the body module 2 includes a body shell 21, a lifting handwheel hole 22 and a metal magnetic wheel 23, and two rows of metal magnetic wheels 23 are provided at the lower part of the body shell 21, and the lifting handwheel hole 22 is processed at the center of the upper surface; the electric control module 1 is located at the upper part of the body module 2, provides power for the grinding device and controls electrical equipment; the milling device module 3 is located inside the body shell 21 of the body module 2, and includes a lifting handwheel 31, a reducer 32, a motor 33, a frame 34 and a spiral milling cutter 36, the motor 33 is connected to the reducer 32 and installed at the rear of the frame 34, and the front end of the transmission shaft on both sides of the reducer 32 is installed Bevel gear one 321, bevel gear two 361 is provided at the rear end of the middle shaft of the spiral milling cutter 36, bevel gear one 321 and bevel gear two 361 are meshed with each other, so that the power of the motor 33 is smoothly output to the spiral milling cutter 36 at mutually perpendicular axial angles, the motor 33 rotates to transmit the power to the reducer 32, and the reducer 32 outputs the power through the transmission shafts on both sides after deceleration, driving the spiral milling cutter 36 to rotate; the lifting handwheel 31 is arranged between the handle 11 and the lower body shell 21, and the lower threaded rod of the lifting handwheel 31 passes through the lifting handwheel hole 22 on the upper surface of the body shell 21 and is connected to the reducer 32; the grinding device contacts the pipeline 4 to be processed through the metal magnetic wheel 23 and is firmly adsorbed on the surface of the pipeline 4 to be processed, and the position of the milling device module 3 inside the body module 2 can be controlled by rotating the lifting handwheel 31, thereby controlling the advance distance of the spiral milling cutter 36, so as to achieve the purpose of controlling the excess height depth of the milling weld.

[0031] The electric control module 1 has an "n" shape, and its upper crossbeam is a handle 11. A square LED display screen 12 is provided at the front end of the handle 11 for displaying the battery power and the motor speed. A frustum-shaped speed regulating knob 13 is provided at the rear of the display screen 12. The motor speed is controlled by the knob. Different milling cutter speeds can be selected according to the actual situation of the weld to be polished. The motor start and stop can be controlled, and the motor speed can also be adjusted by adjusting the duty cycle of the square wave signal.

[0032] A rectangular battery compartment is provided at the lower rear end of the handle 11, and the battery 17 is inserted into the battery compartment from one side. A toggle battery locking switch 14 is provided on the upper part of the battery 17. After the battery 17 is inserted into the predetermined position, the battery locking switch 14 is toggled to lock the battery 17; a circular plug-in power interface 16 is provided on one side of the battery compartment, which can be used for on-board charging of the battery or directly powering the grinding device through an external power adapter. A power indicator light 15 is provided next to the power interface 16, and the different colors of the indicator light 15 indicate the operation of the grinding device and the charging and discharging status of the battery 17.

[0033] The vehicle body shell 21 is in the shape of a rectangular parallelepiped, and its inner wall is provided with a trapezoidal groove, and two rows of metal magnetic wheels 23 are provided at the lower part, with three coaxial metal magnetic wheels 23 arranged in each row. A lifting handwheel hole 22 is provided at the center of the upper surface of the vehicle body shell 21. The lifting handwheel hole 22 is a threaded hole, and the size matches the threaded rod at the lower part of the lifting handwheel 31. The extension length of the threaded rod in the vehicle body shell 21 can be controlled by rotating the lifting handwheel 31. By rotating the lifting handwheel 31, the height of the internal milling device module 3 can be accurately adjusted to adapt to different weld excess heights and milling progresses, so as to facilitate the milling of the weld excess height layer by layer until the weld excess height is completely ground away.

[0034] The metal magnetic wheels 23 are highly magnetic, and six metal magnetic wheels 23 are in contact with the pipe to be processed 4 at the same time, so that the grinding device is firmly adsorbed on the surface of the pipe to be processed 4; the metal magnetic wheels 23 can rotate along the wheel axle, thereby realizing the circumferential movement of the grinding device on the surface of the pipe to be processed.

[0035] The frame 34 is made of aluminum alloy steel, and the rectangular frame 34 constitutes the skeleton of the milling device module 3, and other related accessories are fixed at specific positions of the frame 34. Trapezoidal protrusions are arranged on both sides of the frame 34, and the two trapezoidal protrusions match the trapezoidal grooves on the inner wall of the vehicle body shell 21. The trapezoidal protrusions of the frame 34 can move smoothly inside the trapezoidal grooves on the inner wall of the vehicle body shell 21 to ensure that the milling device module 3 moves vertically up and down inside the vehicle body module 2 without deviation.

[0036] The milling device module 3 also includes a guard plate 38 and screws 39. The guard plate 38 is located in front of the spiral milling cutter 36 and is fixed to the front end of the frame 34 by the screws 39 on both sides. When replacing the spiral milling cutter 36, the screws 39 are removed and the spiral milling cutter 36 is pulled out for replacement. After the replacement is completed, the guard plate 38 is installed and the screws 39 on both sides are tightened. The operation is simple, the cost of maintaining and replacing the spiral milling cutter 36 is low, and the maintenance and replacement of the spiral milling cutter 36 are convenient.

[0037] The milling device module 3 also includes bearings 37. Bearings 37 are installed at both ends of the spiral milling cutter 36. The bearing 37 at one end is embedded in the frame 34, and the bearing 37 at the other end is embedded in the front guard plate 38. The bearings 37 at both ends are used to reduce the rotation friction of the central axis of the spiral milling cutter 36. The spiral milling cutter 36 and the bearings 37 are both arranged at the front of the frame 34.

[0038] The present invention also provides a method for grinding the weld excess height using the above-mentioned pipe butt joint weld excess height grinding device, which is characterized by comprising the following steps:

[0039] 1) Measure the diameter of the pipe 4 to be processed and the height of the weld excess 5 of the pipe butt joint, rotate the lifting hand wheel 31 to rotate the lower threaded rod out, drive the milling device module 3 to rise inside the vehicle body module 2, and make the spiral milling cutter 36 not contact the weld excess 5 of the pipe butt joint;

[0040] 2) Holding the handle 11, place the grinding device on the outer surface of the pipe to be processed 4, ensure that the spiral milling cutter 36 is located directly above the weld excess height 5 of the pipe butt joint, and the six metal magnetic wheels 23 are tightly adsorbed on the outer surface of the pipe to be processed 4 and can be flexibly rotated, so that the grinding device can move smoothly along the circumferential direction on the outer surface of the pipe to be processed 4;

[0041] 3) Turn the speed knob 13 to select the corresponding speed according to the hardness of the weld reinforcement 5 of the pipe butt joint, and turn the lifting hand wheel 31 to slowly move the milling device module 3 downward until the spiral milling cutter contacts the weld reinforcement 5 of the pipe butt joint;

[0042] 4) According to the hardness of the weld, rotate the lifting hand wheel 31 again to lower the milling device module 3 by 1 mm to 2 mm: when the hardness of the weld excess height 5 of the pipe butt joint is high, select a smaller spiral milling cutter 36 to lower the distance; when the hardness of the weld excess height 5 of the pipe butt joint is low, select a larger spiral milling cutter 36 to lower the distance; then stop rotating the lifting hand wheel 31, at this time, hold the handle 11 and slowly push and pull the grinding device back and forth along the outer surface of the pipe 4 to be processed, and grind the weld excess height 5 of the pipe butt joint in sections until the spiral milling cutter 36 is no longer strained, indicating that the weld excess height 5 of the pipe butt joint under this advance distance has been milled.

[0043] 5) Repeat the above steps until the weld excess height 5 of the pipe butt joint is completely milled, rotate the speed knob 13 to turn off the motor, and remove the grinding device by the carrying handle 11 to complete all the grinding work.

[0044] If the spiral milling cutter 36 is damaged and needs to be replaced, rotate the lifting hand wheel 31 to slowly lower the milling device module 3 until the guard plate 38 is removed from the vehicle body shell 21, remove the screws 39 on both sides with a screwdriver, remove the guard plate 38, then pull out the damaged spiral milling cutter 36, replace it with a new spiral milling cutter 36, then install the guard plate 38, and tighten the screws 39 on both sides with a screwdriver. Then rotate the lifting hand wheel 31 in the opposite direction to reset the milling device module 3.

[0045] When used for grinding the weld excess height of a flat plate butt joint, the metal magnetic wheel 23 is sucked on the plate, and the metal magnetic wheel 23 at the bottom of the grinding device can move along the weld of the flat plate joint, and the grinding of the weld excess height is completed according to the operating steps.

[0046] The invention adopts a large torque motor, and the speed of the spiral milling cutter is stable. The speed of the milling cutter can be flexibly adjusted according to the hardness of the welding joint, the specific size, etc., the operation is simple, the grinding speed is fast, and the grinding efficiency is high; the design also has a milling and grinding device module height adjustment mechanism, the milling cutter advance distance is adjusted by turning the lifting hand wheel, and the milling cutter speed is flexibly adjusted by using the debugging knob, the weld excess height milling and grinding are integrated, no other processing is required, and the grinding quality is high; its lower part is processed into an arc surface, which has a wide range of applications and can be used for the weld excess height grinding of butt joints of pipes with different diameters, and can also be used for the weld excess height grinding of flat butt joints; the modular design is adopted, and each module is easy to disassemble and assemble, which is convenient for later maintenance and replacement of accessories, and the manufacturing cost and use cost are low. At the same time, the grinding head can also be replaced to replace the spiral milling cutter to realize the integrated operation of weld grinding and parent material grinding, the process has good applicability, strong versatility and high economic benefit; the structure is single-sided grinding, which can realize the weld excess height grinding of the butt joints of straight pipes and straight pipes, and can also realize the weld excess height grinding of the butt joints of straight pipes and elbows.

[0047] The present invention has a compact structure, each module device is small in size, and is battery-powered, easy to carry, safe and reliable, and is particularly suitable for engineering projects at high altitudes, in narrow spaces, and in complex construction environments; it has a simple structure, low use and maintenance costs, and is easy to operate. Compared with manual grinding with existing grinders, the grinding speed and grinding quality are greatly improved, and the grinding cost is greatly reduced.

[0048] The above embodiments of the present invention are merely illustrative and not exclusive, and all modifications within the scope of the present invention or equivalent to the scope of the present invention are encompassed by the present invention.

Claims

1. A pipeline butt joint weld excess height grinding device, characterized in that: The invention comprises three parts: an electric control module (1), a vehicle body module (2) and a milling device module (3). The main body is a rectangular trolley structure with an "n"-shaped hand-held handle (11) on the upper part; the vehicle body module (2) comprises a vehicle body shell (21), a lifting hand wheel hole (22) and a metal magnetic wheel (23). The lower part of the vehicle body shell (21) is provided with two rows of metal magnetic wheels (23), and the central part of the upper surface thereof is processed with a lifting hand wheel hole (22); the electric control module (1) is located on the upper part of the vehicle body module (2), provides power for the grinding device and controls the electrical equipment; the milling device module (3) is located inside the vehicle body shell (21) of the vehicle body module (2), comprises a lifting hand wheel (31), a reducer (32), a motor (33), a frame (34) and a spiral milling cutter (36), and the motor (33) and the reducer (32) are connected to each other. The two components are connected and installed at the rear of the frame (34); the front ends of the transmission shafts on both sides of the reducer (32) are provided with a first umbrella gear (321); the rear end of the central axis of the spiral milling cutter (36) is provided with a second umbrella gear (361); the first umbrella gear (321) and the second umbrella gear (361) are meshed with each other; the motor (33) rotates to drive the spiral milling cutter (36) to rotate; the threaded rod at the lower part of the lifting hand wheel (31) passes through the lifting hand wheel hole (22) on the upper surface of the vehicle body shell (21) and is connected to the reducer (32); the grinding device contacts the pipeline to be processed (4) through the metal magnetic wheel (23) and is firmly adsorbed on the surface of the pipeline to be processed (4); the position of the milling device module (3) inside the vehicle body module (2) can be controlled by rotating the lifting hand wheel (31), thereby controlling the advance distance of the spiral milling cutter (36), so as to achieve the purpose of controlling the excess height depth of the milling weld.

2. The pipeline butt joint weld excess height grinding device according to claim 1 is characterized in that: The electric control module (1) has an "n" shape, and its upper crossbeam is a handle (11). A square LED display screen (12) is arranged at the front end of the handle (11) for displaying the battery power and the rotation speed of the motor (33). A truncated cone-shaped speed regulating knob (13) is arranged at the rear of the display screen (12), which can control the start and stop of the motor (33) and can also adjust the rotation speed of the motor (33) by adjusting the duty cycle of the square wave signal.

3. The pipeline butt joint weld excess height grinding device according to claim 1 is characterized in that: A rectangular battery compartment is provided at the lower rear end of the handle (11), and a battery (17) is inserted into the battery compartment from one side. A toggle-type battery locking switch (14) is provided at the upper part of the battery (17). After the battery (17) is inserted into a predetermined position, the battery locking switch (14) is toggled to lock the battery (17); a circular plug-in power interface (16) is provided at one side of the battery compartment, which can be used for onboard battery charging or for directly powering the grinding device through an external power adapter.

4. The pipeline butt joint weld excess height grinding device according to claim 1 is characterized in that: The vehicle body shell (21) is in the shape of a rectangular parallelepiped, and its inner wall is provided with a trapezoidal groove. Two rows of metal magnetic wheels (23) are provided at the lower part, and three coaxial metal magnetic wheels (23) are arranged in each row. A lifting hand wheel hole (22) is provided at the center of the upper surface of the vehicle body shell (21), and the lifting hand wheel hole (22) is a threaded hole.

5. The pipeline butt joint weld excess height grinding device according to claim 1 is characterized in that: The metal magnetic wheels (23) are highly magnetic, and the six metal magnetic wheels (23) are in contact with the pipe to be processed (4) at the same time, so that the grinding device is firmly adsorbed on the surface of the pipe to be processed (4); the metal magnetic wheels (23) can rotate along the wheel axle, thereby realizing the circumferential movement of the grinding device on the surface of the pipe to be processed (4).

6. The pipeline butt joint weld excess height grinding device according to claim 1 is characterized in that: The frame (34) is made of aluminum alloy steel and is provided with trapezoidal protrusions on both sides. The two trapezoidal protrusions match the trapezoidal grooves on the inner wall of the vehicle body shell (21). The trapezoidal protrusions of the frame (34) can move smoothly inside the trapezoidal grooves on the inner wall of the vehicle body shell (21) to ensure that the milling device module (3) moves vertically up and down inside the vehicle body module (2) without deviation.

7. The pipeline butt joint weld excess height grinding device according to claim 1 is characterized in that: The milling device module (3) also includes a guard plate (38) and screws (39). The guard plate (38) is located in front of the spiral milling cutter (36). The guard plate (38) is fixed to the front end of the frame (34) by screws (39) on both sides. When replacing the spiral milling cutter (36), the screws (39) are removed, and the spiral milling cutter (36) is pulled out for replacement. After the replacement is completed, the guard plate (38) is installed and the screws (39) on both sides are tightened.

8. The pipeline butt joint weld excess height grinding device according to any one of claims 1 to 7, characterized in that: The milling device module (3) also includes a bearing (37). Bearings (37) are installed at both ends of the spiral milling cutter (36). The bearing (37) at one end is embedded in the frame (34), and the bearing (37) at the other end is embedded in the front guard plate (38). The bearings (37) at both ends are used to reduce the rotation friction of the central axis of the spiral milling cutter (36). The spiral milling cutter (36) and the bearing (37) are both arranged at the front of the frame (34).

9. A method for grinding weld excess height using the weld excess height grinding device for pipe butt joints according to any one of claims 1 to 8, characterized in that: The steps include: 1) Measure the diameter of the pipeline (4) to be processed and the height of the weld excess (5) of the pipeline butt joint, rotate the lifting hand wheel (31) to rotate the lower threaded rod out, drive the milling device module (3) to rise inside the vehicle body module (2), and make the spiral milling cutter (36) not contact the weld excess (5) of the pipeline butt joint; 2) Holding the handle (11), the grinding device is placed on the outer surface of the pipe to be processed (4), ensuring that the spiral milling cutter (36) is located directly above the weld excess height (5) of the pipe butt joint, and the six metal magnetic wheels (23) are tightly adsorbed on the outer surface of the pipe to be processed (4) and can be flexibly rotated, so that the grinding device can move smoothly along the circumferential direction on the outer surface of the pipe to be processed (4); 3) Turn the speed knob (13) to select a corresponding speed according to the hardness of the weld excess height (5) of the pipe butt joint, and turn the lifting hand wheel (31) to slowly move the milling device module (3) downward until the spiral milling cutter (36) contacts the weld excess height (5) of the pipe butt joint; 4) According to the hardness of the weld, the lifting hand wheel (31) is rotated again to lower the milling device module (3) by 1 mm to 2 mm, and then the lifting hand wheel (31) is stopped. At this time, the handle (11) is held and slowly reciprocated to push and pull the grinding device along the outer surface of the pipe to be processed (4), and the weld excess height (5) of the pipe butt joint is ground in sections until the spiral milling cutter (36) is no longer strained, indicating that the weld excess height (5) of the pipe butt joint under this advance distance has been milled. 5) Repeat the above steps until the pipe butt joint weld excess height (5) is completely milled, rotate the speed knob (13) to turn off the motor (33), and remove the grinding device by the carrying handle (11), completing the entire grinding work.

10. The grinding method according to claim 9, characterized in that: In step 4), the descending distance of 1 mm to 2 mm of the milling device module (3) is: when the hardness of the weld excess height (5) of the pipe butt joint is high, a smaller spiral milling cutter (36) descending distance is selected; when the hardness of the weld excess height (5) of the pipe butt joint is low, a larger spiral milling cutter (36) descending distance is selected.

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