Repair welding and surfacing device and method for inner opening of pipe body

Abstract

The invention relates to a pipe body inner opening repair welding surfacing device and method, and relates to the technical field of pipeline butt joint, the device comprises a fixing table and a mounting plate rotationally arranged on the fixing table, and a first sliding groove is formed in the mounting plate; a positioning assembly used for controlling the width of a repair welding surfacing layer and a welding gun support assembly used for assisting a welding gun in welding are arranged in the first sliding groove in a sliding mode. A monitoring assembly used for monitoring the interlayer temperature and the surface appearance in the welding process of the repair welding surfacing layer is arranged at the end of the mounting plate, and a monitoring and cooling integrated assembly used for monitoring the included angle between the repair welding surfacing layer and the axis of the pipe body and conducting air cooling on the repair welding surfacing layer is further arranged. The repair welding surfacing method is suitable for the condition that the alignment tolerance of the inner opening coating is relatively large when the composite pipes made of different materials are aligned, the alignment tolerance of the inner opening of the composite pipe is reduced through repair welding surfacing of the inner opening coating by manual argon arc welding, and the first-pass yield of butt welding seams of the composite pipe is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline butt joint, and specifically relates to a device and method for repair welding and surfacing of the inner orifice of a pipe. Background Technique

[0002] For the pipeline transportation of oil and gas fields under environmental conditions such as deep sea, desert, polar regions, and strong corrosive media with high content of H2S, CO2, Cl, etc., due to the large amount of corrosive media such as H2S, CO2, Cl in petroleum and natural gas, the characteristics of the pipes used are that in addition to having high strength and stiffness, they should also have the ability to resist corrosion of the above media. Generally, 316L / 8825 / 6625 composite pipe materials can be used. As the composite steel pipe for petroleum and natural gas transportation pipelines and oil wells, the above materials are usually selected as the inner layer pipe to ensure the corrosion resistance of the pipeline, while the outer layer material is usually ordinary carbon steel and other materials to ensure the strength of the pipeline and save the cost of materials at the same time.

[0003] Due to the manufacturing process of the composite pipe, the flanges, elbows and special pipe sections used in engineering construction are composite pipes with surfacing inner layer (cladding), while most of the straight pipe sections in construction are composite pipe sections rolled from composite plates. This results in a large deviation of 5 - 10 mm in the inner orifice diameter during the on-site butt welding operation of the composite pipe weld. According to the requirements of relevant specification standards, the misalignment deviation of the composite pipe weld should not be greater than 1 mm. If forced welding is carried out, the welding quality may not be guaranteed, and at the same time, a large step may be formed in the inner orifice weld. Over time, the flowing material may accumulate here, which will aggravate the corrosion of the inner orifice of the weld and reduce the service life of the composite pipe. Unlike pipes of the same material, if the misalignment of the inner orifice of pipes of the same material is large, as long as the strength of the pipeline is ensured, the problem of large misalignment can be solved by the method of unilateral inner orifice thinning, while this method cannot be used for composite pipes. When the existing composite pipes are butt-jointed, manual argon arc welding is generally used to repair weld and surfacing the inner cladding to reduce and eliminate the misalignment difference of the inner orifice of the composite pipe. During manual argon arc welding, since the whole process is completely manually operated, the welding quality depends to a large extent on the skill level, operation experience and concentration of the welder, resulting in the lack of stability in the quality of repair welding and surfacing of the inner cladding.

[0004] Therefore, we provide a device and method for repair welding and surfacing of the inner orifice of a pipe to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a device and method for repair welding and surfacing of the inner orifice of a pipe for the problems in the background technique.

[0006] The present invention realizes the above purpose through the following technical solutions:

[0007] A repair welding and surfacing device for the inner opening of a pipe, which is used to form a repair welding and surfacing layer at the inner opening of the pipe. The device includes a fixed table and a mounting plate rotatably arranged on the fixed table. The mounting plate is provided with a first chute, and a positioning component for controlling the width of the repair welding and surfacing layer and a welding torch support component for assisting the welding torch to weld are slidably arranged in the first chute; an end of the mounting plate is provided with a monitoring component for monitoring the interlayer temperature and surface topography during the welding process of the repair welding and surfacing layer, and a monitoring and cooling integrated component for monitoring the included angle between the repair welding and surfacing layer and the axis of the pipe and air-cooling the repair welding and surfacing layer.

[0008] As a further optimized solution of the present invention, one end of the mounting plate close to the fixed table is provided with a rotating shaft, the rotating shaft penetrates through the fixed table and a crank is fixedly arranged at its end; a locking member for restricting its rotation is arranged on the rotating shaft; a scale for indicating the rotation orientation of the mounting plate is arranged on the side of the fixed table close to the crank; a display screen for displaying the monitoring data of the monitoring component and the monitoring and cooling integrated component is hinged on the top of the fixed table.

[0009] As a further optimized solution of the present invention, the positioning component includes a first magnetic slider adsorbed into the first chute and a laser light plate fixed on the first magnetic slider; the laser light plate is vertically emitted towards the cladding.

[0010] As a further optimized solution of the present invention, the monitoring component includes an inclined plate rotatably arranged on the mounting plate by using a torsion spring and a temperature sensor and a camera fixed on the inclined plate; a first pulling rope for controlling the inclination angle of the inclined plate is arranged at one end of the inclined plate away from the torsion spring, a second magnetic slider is fixedly arranged at the end of the first pulling rope, and a second chute for cooperating with the second magnetic slider is arranged at one end of the mounting plate close to the fixed table.

[0011] As a further optimized solution of the present invention, the welding torch support component includes a third magnetic slider adsorbed into the first chute and a movable rod movably penetrating through the third magnetic slider; a support plate is fixedly arranged at the end of the movable rod, a ball joint seat for the welding torch to pass through is rotatably arranged in the support plate, and a first spring is sleeved on the movable rod between the support plate and the third magnetic slider.

[0012] As a further optimized solution of the present invention, the monitoring and cooling integrated component includes a plate body vertically inserted into the mounting plate and a plurality of distance measuring sensors fixedly arranged on the plate body at equal intervals; a second pulling rope for controlling the lifting of the plate body is arranged at one end of the plate body, a fourth magnetic slider is fixedly arranged at the end of the second pulling rope, a third chute for cooperating with the fourth magnetic slider is also arranged at one end of the mounting plate close to the fixed table, and a second spring is arranged between the plate body and the inner cavity bottom surface of the mounting plate; a plurality of air outlet holes are arranged on both sides of the distance measuring sensor, a heat dissipation fan is arranged inside the fixed table, and an air duct is arranged between the heat dissipation fan and the plate body.

[0013] As a further optimized solution of the present invention, a scrubbing assembly for cleaning the inner opening of the composite pipe is fixedly provided at the end of the mounting plate. The scrubbing assembly includes a mounting frame and an acetone storage cylinder located inside the mounting frame; a valve is provided at the top of the acetone storage cylinder. Adjusting rods are movably penetrated through both ends of the mounting frame. The adjusting rods are locked by setscrew knobs, and mounting seats are hinged at their ends. Cleaning brushes are mounted on the mounting seats, and an infusion tube is provided between the valve and the mounting seat.

[0014] The present invention also provides a method for repairing and surfacing the inner opening of a pipe body, including the following steps:

[0015] S1. When two sections of pipe bodies are butted, if the misalignment difference of the inner opening > 1 mm, a repair and surfacing layer is welded by using a repair and surfacing device;

[0016] S2. The welding torch is assisted by a welding torch support assembly during welding. During the welding process, the width of the repair and surfacing layer is controlled by a positioning assembly, the interlayer temperature and surface morphology of the repair and surfacing layer are monitored in real time by a monitoring assembly, the angle between the repair and surfacing layer and the axis of the pipe body is controlled by a monitoring and cooling integration assembly, and air cooling is used to control the interlayer temperature;

[0017] S3. After welding is completed, the end face of the pipe body and the repair and surfacing layer are polished.

[0018] As a further optimized solution of the present invention, the width of the repair and surfacing layer is 24 - 26 mm; the angle between the repair and surfacing layer and the axis of the pipe body is 14° ± 1°.

[0019] As a further optimized solution of the present invention, the angle of the end face of the pipe body after polishing is 37° ± 3°.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The repair and surfacing method of the present invention is applicable to the situation where the misalignment amount of the inner cladding of the inner opening is relatively large when different - material composite pipes are butted. By manual argon arc welding for repairing and surfacing the inner cladding of the inner opening, the misalignment difference of the inner opening of the composite pipe is reduced, avoiding defects such as incomplete fusion and incomplete penetration in the backing welding of the butt weld of the composite pipe, improving the first - pass qualification rate of the butt weld of the composite pipe. The welding process is simple, the process connection is tight, the work efficiency is high, it is economical and practical, easy to operate, and easy for welders to quickly master.

[0023] 2. The repair and surfacing device of the present invention, with the welding torch assisted by a welding torch support assembly, can efficiently and qualitatively complete the welding of the repair and surfacing layer by controlling the welding specifications and welding parameters of the repair and surfacing layer in real time through a positioning assembly, a monitoring assembly, and a monitoring and cooling integration assembly.

[0024] 3. The repair welding and surfacing device of the present invention can scrub the composite pipe with acetone before and after welding through the scrubbing component, effectively improving the cleaning efficiency and uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the repair welding and surfacing device of the present invention;

[0026] Figure 2 It is a schematic diagram of the structures of various components on the mounting plate of the repair welding and surfacing device of the present invention;

[0027] Figure 3 It is a schematic diagram of the bottom structure of the mounting plate of the repair welding and surfacing device of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the welding torch support assembly of the repair welding and surfacing device of the present invention;

[0029] Figure 5 It is a schematic diagram of the structure of the monitoring and cooling integrated component of the repair welding and surfacing device of the present invention;

[0030] Figure 6 It is a schematic diagram of the structure of the scrubbing component of the repair welding and surfacing device of the present invention;

[0031] Figure 7 It is a front sectional view of the repair welding and surfacing of the inner opening of the composite pipe of the present invention;

[0032] Figure 8 It is an effect diagram of the repair welding and surfacing of the inner opening of the composite pipe of the present invention;

[0033] Figure 9 It is a circumferential distribution diagram for measurement when the composite pipes of the present invention are butted;

[0034] Figure 10 It is a sectional welding zoning diagram for the repair welding and surfacing of the inner opening of the composite pipe of the present invention.

[0035] In the figure:

[0036] 1. Base layer; 2. Covering layer; 3. Repair welding surfacing layer; 4. Fixing table; 401. Display screen; 402. Dial; 5. Mounting plate; 501. First slide; 502. Rotating shaft; 503. Crank; 504. Locking piece; 505. Second slide; 506. Third slide; 6. Positioning assembly; 601. First magnetic slider; 602. Laser light board; 7. Monitoring assembly; 701. Inclined plate; 702. Temperature sensor; 703. Camera; 704. First pull rope; 705. Second magnetic slider; 8. Welding gun bracket assembly; 801. Third magnetic slider Slider; 802, movable rod; 803, support plate; 804, ball joint; 805, first spring; 9, monitoring and cooling integrated component; 901, plate body; 902, distance sensor; 903, air outlet; 904, second spring; 905, second pull rope; 906, fourth magnetic slider; 907, air duct; 908, cooling fan; 10, scrubbing component; 1001, mounting bracket; 1002, acetone storage cylinder; 1003, valve; 1004, adjusting rod; 1005, mounting seat; 1006, cleaning brush; 1007, infusion tube. DETAILED DESCRIPTION

[0037] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0038] Embodiment 1

[0039] As the name implies, a composite pipe is a pipe made of two or more materials combined through a composite process. The composite pipe used in this project is a composite pipe with an outer carbon steel pipe and a 2.5-3.5mm layer of 8825 nickel-based alloy or 316L stainless steel on the inner end, so as to achieve both pipe strength and corrosion resistance. However, due to the manufacturing process, in the composite pipe assembly, the inner end of a part of the composite pipe has a large misalignment. If forced welding is performed, the welding quality may not be guaranteed. At the same time, a large step may be formed in the weld at the inner end. Over time, flowing materials may accumulate here, which will aggravate the corrosion of the inner end of the weld and reduce the service life of the composite pipe. Moreover, unlike pipes of the same material, if the inner end of the composite pipe has a large misalignment, as long as the strength of the pipe is guaranteed, the problem of large misalignment can be solved by thinning the inner end on one side. In order to solve the problem that when the two sections of the composite pipe are butt-jointed, if there is a large deviation, such as a 5-10mm deviation in the inner end diameter, the existing butt welding method is prone to defects such as incomplete fusion and incomplete penetration. Please refer to Figures 7 - 10, a method for repair welding and surfacing of the inner opening of a pipe body provided by the present invention achieves and solves the above-mentioned problems through the repair welding and surfacing of the inner opening of a composite pipe. At the same time, it increases the corrosion-resistant thickness of the cladding layer on the inner surface of the composite pipe at high temperature, acid, and alkali, and indirectly ensures the qualified rate of non-destructive testing of the weld. The composite pipe is provided with a base layer 1 and a cladding layer 2 on the inner surface of the base layer 1, and the repair welding and surfacing layer 3 is attached to the inner surface of the cladding layer 2, including the following steps:

[0040] S1. Use acetone to scrub the inner openings at both ends of the welded joint of the assembled composite pipe to remove the dirt inside the opening and improve the cleanliness of the inner opening.

[0041] S2. Use a pipe alignment device to assemble two sections of composite pipes, and adjust the concentricity and coaxiality of the two pipe sections through the alignment device to prevent excessive local out-of-tolerance on the outer walls of the two pipe orifices of the assembled composite pipe. When there is no misalignment or uniform misalignment on the outer walls of the two pipe sections after adjustment, evenly divide the two aligned pipe sections into 8 inner opening misalignment measurement points in the clockwise direction, as Figure 9 shown, and clearly mark them on the outer edge of the pipe. Use a misalignment detection ruler to measure the misalignment amount in the clockwise direction along the marked inner opening misalignment measurement points, and record the measurement data. If the detection data of all 8 points are < 1 mm, directly perform butt welding. If the local misalignment of the detection data of 8 points > 1 mm or all misalignments > 1 mm, reopen the welded joint of the assembly, and then perform manual argon arc repair welding or surfacing.

[0042] S3. Use acetone to scrub the repair welding and surfacing position of the composite pipe. Use a welding wire of the same material as the cladding layer 2. In this project, 8825 nickel-based alloy or 316L stainless steel is used, and the repair welding and surfacing layer 3 is formed by welding with a welding torch.

[0043] Among them, (1) when selecting the diameter of the welding torch nozzle, it is 2 - 3 times the diameter of the tungsten electrode plus 4 mm to achieve the best argon protection range;

[0044] (2) When selecting the tungsten electrode, determine the diameter of the tungsten electrode according to the workpiece characteristics and the welding wire specifications to avoid the tungsten electrode being too small and easily melting and evaporating, causing unstable arc and tungsten inclusion in the weld, and the tungsten electrode being too large and easily causing arc deflection;

[0045] (3) The angle between the argon arc welding torch and the welding reverse direction is controlled between 60 - 70 degrees to facilitate the efficient agitation of the molten pool by the welding arc, forcing the molten droplets to flow, and allowing the harmful gases and impurities contained therein to escape;

[0046] (4) The oxide and floating ash on the surface of each weld seam need to be removed to avoid poor fusion at the overlapping part of the fusion line between weld seams or shrinkage holes at the end of the arc on the outer surface;

[0047] (5) Before using the welding wire, clean it with a cotton cloth dipped in propanol to remove the surface floating ash. During the welding process, the welding wire head should always be kept under the argon protection of the argon arc welding torch to prevent the welding wire head from being contaminated by air when it is out of the argon protection. If the welding wire head is contaminated, use pliers to cut off the contaminated end of the welding wire head and then proceed with normal welding;

[0048] (6) During the process of repair welding and surfacing welding, under any circumstances, the interlayer temperature shall not exceed 120 °C to prevent the separation of the clad layer 2 and the base layer 1 of the composite pipe caused by excessive current or increase the tendency to generate welding cracks;

[0049] (7) During the process of repair welding and surfacing welding, such as Figure 10 , adopt sectional welding. After welding a weld in each area, then weld the next area weld bead until the entire weld is completed, and then weld the next weld bead to better control the interlayer temperature during welding, eliminate welding defects, and ensure the welding quality;

[0050] (8) During the process of repair welding and surfacing welding, adopt multi-pass and multi-layer welding. The width of each weld bead shall not be > 3 times the diameter of the welding wire. Such as Figures 7 - 8 , the width of the repair welding and surfacing layer 3 is 24 - 26 mm, and the included angle between the repair welding and surfacing layer 3 and the clad layer 2 is 14° ± 1°;

[0051] S4. After the repair welding and surfacing layer 3 meets the requirements, conduct PMI testing to detect whether the alloy composition of the weld is the same as that of the clad layer 2 material and whether it can meet the corrosion resistance requirements. After passing the test, set up a plugging facility at the inner mouth of the composite pipe to prevent the dust from the grinding wheel during subsequent grinding of the repair welding and surfacing part from contaminating the inner mouth of the composite pipe and reduce the contamination area of the clad layer 2 at the inner mouth of the composite pipe. The angle of the composite pipe end face after grinding is 37° ± 3°. After grinding, first clean the inner mouth of the composite pipe with a brush and then wipe it with acetone to improve the cleanliness of the inner mouth;

[0052] S5. Conduct LPT testing to detect whether there are defects such as cracks, slag inclusions, and pores on the weld surface. If there are defects, repair them locally by manual argon arc welding and test until qualified (the number of repairs does not exceed 2 times). After passing the test, carry out butt welding of the composite pipe.

[0053] Example Two

[0054] On the basis of Example One, in order to complete the welding of the repair welding and surfacing layer 3 efficiently and with high quality and reduce the inner mouth misalignment difference when two sections of composite pipes are butted, a kind of inner mouth repair welding and surfacing device for the pipe body provided by the present invention is as Figures 1 - 2As shown in the figure, it includes a fixed table 4 and a mounting plate 5 rotatably arranged on the fixed table 4. A first sliding groove 501 is provided on the mounting plate 5. A positioning component 6 for controlling the width of the repair welding surfacing layer 3 and a welding torch support component 8 for assisting the welding torch to weld are slidably arranged in the first sliding groove 501. A monitoring component 7 for monitoring the interlayer temperature and surface topography during the welding process of the repair welding surfacing layer 3 is provided at the end of the mounting plate 5, and a monitoring and cooling integrated component 9 for monitoring the included angle between the repair welding surfacing layer 3 and the cladding layer 2 and quickly cooling the repair welding surfacing layer 3 is also provided. During the repair welding and surfacing process, the welding torch is assisted to weld by the welding torch support component 8, and the welding specifications and welding parameters of the repair welding surfacing layer 3 are controlled in real time by the positioning component 6, the monitoring component 7 and the monitoring and cooling integrated component 9.

[0055] As Figures 2 - 3 shown, one end of the mounting plate 5 close to the fixed table 4 is provided with a rotating shaft 502. The rotating shaft 502 penetrates the fixed table 4 and a crank 503 is fixedly arranged at its end. A locking member 504 for restricting its rotation is provided on the rotating shaft 502. A scale disk 402 for indicating the rotation orientation of the mounting plate 5 is provided on the side of the fixed table 4 close to the crank 503. A display screen 401 for displaying the monitoring data of the monitoring component 7 and the monitoring and cooling integrated component 9 is hinged on the top of the fixed table 4. The setting of the display screen 401 makes the device more intuitive and can more conveniently grasp the welding quality. By rotating the crank 503, the crank 503 drives the rotating shaft 502 to rotate, the rotating shaft 502 drives the mounting plate 5 to rotate, and the mounting plate 5 drives the various components thereon to rotate, so as to realize the regional welding of the repair welding surfacing layer 3, and the welding efficiency is higher.

[0056] As Figure 2 shown, the positioning component 6 includes a first magnetic slider 601 adsorbed in the first sliding groove 501 and a laser light plate 602 fixed on the first magnetic slider 601. The laser light plate 602 is vertically irradiated onto the cladding layer 2. The position of the positioning component 6 in the first sliding groove 501 can be adjusted according to actual needs. In this project, through the irradiation positioning of the laser light plate 602, it is ensured that the width of the repair welding surfacing layer 3 is 24 - 26 mm.

[0057] As Figures 2 - 3As shown in the figure, the monitoring component 7 includes an inclined plate 701 rotatably arranged on the mounting plate 5 by a torsion spring, and a temperature sensor 702 and a camera 703 fixed on the inclined plate 701; one end of the inclined plate 701 away from the torsion spring is provided with a first pulling rope 704 for controlling the inclination angle of the inclined plate 701, and a second magnetic slider 705 is fixedly arranged at the end of the first pulling rope 704. One end of the mounting plate 5 close to the fixed table 4 is provided with a second chute 505 cooperating with the second magnetic slider 705. The interlayer temperature is controlled not to exceed 120°C by the temperature sensor 702, and the surface morphology of the repair welding surfacing layer 3 is photographed in real time by the camera 703 to facilitate timely detection of appearance defects. By adjusting the position of the second magnetic slider 705 in the second chute 505, the second magnetic slider 705 drives the first pulling rope 704 to move, and the first pulling rope 704 drives the inclined plate 701 to rotate, so as to adjust the orientations of the temperature sensor 702 and the camera 703 and improve the comprehensiveness of monitoring.

[0058] As Figure 4 shown in the figure, the welding torch support component 8 includes a third magnetic slider 801 adsorbed into the first chute 501 and a movable rod 802 movably penetrating through the third magnetic slider 801; a support plate 803 is fixedly arranged at the end of the movable rod 802, and a ball joint seat 804 for the welding torch to pass through is rotatably arranged in the support plate 803. A first spring 805 is sleeved on the movable rod 802 between the support plate 803 and the third magnetic slider 801. The welding torch is supported by the ball joint seat 804, making it easier for the welder to control the welding torch and avoid the welding torch from shaking.

[0059] As Figure 5 shown in the figure, the monitoring and cooling integrated component 9 includes a plate body 901 vertically inserted into the mounting plate 5 and a plurality of distance sensors 902 equally spaced and fixed on the plate body 901; one end of the plate body 901 is provided with a second pulling rope 905 for controlling the lifting of the plate body 901, and a fourth magnetic slider 906 is fixedly arranged at the end of the second pulling rope 905. One end of the mounting plate 5 close to the fixed table 4 is further provided with a third chute 506 cooperating with the fourth magnetic slider 906. A second spring 904 is arranged between the plate body 901 and the inner cavity bottom surface of the mounting plate 5; a plurality of air outlet holes 903 are arranged on both sides of the distance sensor 902, a heat dissipation fan 908 is arranged inside the fixed table 4, and an air duct 907 is arranged between the heat dissipation fan 908 and the plate body 901. The distance to the surface of the repair welding surfacing layer 3 is measured by the plurality of distance sensors 902, and the included angle between the repair welding surfacing layer 3 and the cladding layer 2 is calculated and controlled to be 14°±1°; the external cold air is conveyed into the plate body 901 by the heat dissipation fan 908 through the air duct 907 and sprayed out from the air outlet holes 903 to quickly cool the repair welding surfacing layer 3, effectively controlling the interlayer temperature and improving the welding efficiency.

[0060] Embodiment III

[0061] Based on the first and second embodiments, in order to improve the cleaning efficiency and uniformity, as Figure 1 , Figure 6 shown, a scrubbing assembly 10 for cleaning the inner opening of the composite pipe with acetone is fixedly provided at the end of the mounting plate 5. The inner openings of the ends of two composite pipes to be butted can be scrubbed with acetone by the scrubbing assembly 10 before measurement, the acetone scrubbing can be carried out on the repair welding and surfacing positions by the scrubbing assembly 10 before welding, and the composite pipe after grinding can be scrubbed with acetone by the scrubbing assembly 10, effectively improving the cleaning efficiency and uniformity.

[0062] The scrubbing assembly 10 includes a mounting frame 1001 and an acetone storage cylinder 1002 located inside the mounting frame 1001; a valve 1003 is provided at the top of the acetone storage cylinder 1002, adjusting rods 1004 are movably penetrated through both ends of the mounting frame 1001, the adjusting rods 1004 are locked by a setscrew knob, and a mounting seat 1005 is hinged at the end thereof. A cleaning brush 1006 is mounted on the mounting seat 1005, and an infusion tube 1007 is provided between the valve 1003 and the mounting seat 1005. During use, by rotating the crank 503, the crank 503 drives the mounting plate 5 to rotate, the mounting plate 5 drives the scrubbing assembly 10 to rotate, and under the action of centrifugal force, the acetone in the acetone storage cylinder 1002 is conveyed to the cleaning brush 1006 through the infusion tube 1007, so as to scrub the composite pipe with acetone. The protruding length of the cleaning brush 1006 can be freely adjusted to adapt to the use of composite pipes of different specifications.

[0063] The above-described embodiments merely represent one implementation manner of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several variations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A pipe body inner opening repair welding cladding device, used for forming a repair welding cladding layer (3) at the pipe body inner opening, characterized in that: The device comprises a fixed platform (4) and a mounting plate (5) rotatably arranged on the fixed platform (4); a first slide groove (501) is arranged on the mounting plate (5); a positioning component (6) for controlling the width of the repair welding cladding layer (3) and a welding gun support component (8) for assisting welding with a welding gun are slidably arranged in the first slide groove (501); The end of the mounting plate (5) is provided with a monitoring component (7) for monitoring the interlayer temperature and surface morphology during the welding process of the repair welding overlay layer (3), and is also provided with a monitoring and cooling integrated component (9) for monitoring the angle between the repair welding overlay layer (3) and the axis of the pipe body and for air cooling the repair welding overlay layer (3).

2. A pipe body inner opening repair welding device according to claim 1, characterized in that: A rotating shaft (502) is provided at one end of the mounting plate (5) close to the fixing platform (4), the rotating shaft (502) passes through the fixing platform (4) and a crank (503) is fixedly provided at the end thereof, and a locking member (504) for limiting the rotation of the rotating shaft (502); A dial (402) for indicating the rotational position of the mounting plate (5) is provided on the side of the fixing platform (4) close to the crank (503); The top of the fixed platform (4) is hingedly provided with a display screen (401) for displaying monitoring data of the monitoring component (7) and the monitoring cooling integrated component (9).

3. The pipe body inner opening repair welding device according to claim 1, characterized in that: The positioning component (6) comprises a first magnetic slider (601) adsorbed into the first slide groove (501) and a laser light board (602) fixed on the first magnetic slider (601); The laser light panel (602) is vertically irradiated toward the coating (2).

4. The pipe body inner opening repair welding device according to claim 1, characterized in that: The monitoring assembly (7) comprises an inclined plate (701) arranged on the mounting plate (5) and rotated by a torsion spring, and a temperature sensor (702) and a camera (703) fixed on the inclined plate (701); A first pull rope (704) for controlling the tilt angle of the inclined plate (701) is provided at one end of the inclined plate (701) away from the torsion spring, a second magnetic slider (705) is fixedly provided at the end of the first pull rope (704), and a second slide groove (505) matching with the second magnetic slider (705) is provided at one end of the mounting plate (5) close to the fixed platform (4).

5. The pipe body inner opening repair welding device according to claim 1, characterized in that: The welding gun support assembly (8) comprises a third magnetic slider (801) adsorbed into the first slide groove (501) and a movable rod (802) movably penetrating the third magnetic slider (801); A support plate (803) is fixedly provided at the end of the movable rod (802), a ball joint (804) for a welding gun to pass through is rotatably provided inside the support plate (803), and a first spring (805) is sleeved on the movable rod (802) between the support plate (803) and the third magnetic slider (801).

6. The pipe body inner opening repair welding device according to claim 1, characterized in that: The monitoring and cooling integrated component (9) comprises a plate body (901) vertically inserted into the mounting plate (5) and a plurality of equally spaced distance measuring sensors (902) fixed on the plate body (901); A second pull rope (905) for controlling the lifting of the plate body (901) is provided at one end of the plate body (901); a fourth magnetic slider (906) is fixedly provided at the end of the second pull rope (905); a third slide groove (506) matching with the fourth magnetic slider (906) is also provided at one end of the mounting plate (5) close to the fixing platform (4); and a second spring (904) is provided between the plate body (901) and the bottom surface of the inner cavity of the mounting plate (5); A plurality of air outlets (903) are provided on both sides of the distance measuring sensor (902), a heat dissipation fan (908) is provided inside the fixing platform (4), and an air supply pipe (907) is provided between the heat dissipation fan (908) and the plate body (901).

7. The pipe body inner opening repair welding device according to claim 1, characterized in that: A scrubbing assembly (10) for cleaning the inner opening of the composite pipe is also fixedly provided at the end of the mounting plate (5), wherein the scrubbing assembly (10) comprises a mounting frame (1001) and an acetone storage cylinder (1002) located in the mounting frame (1001); A valve (1003) is provided on the top of the acetone storage cylinder (1002); adjusting rods (1004) are movably provided at both ends of the mounting frame (1001); the adjusting rod (1004) is locked by a top screw knob and a mounting seat (1005) is hingedly provided at its end; a cleaning brush (1006) is installed on the mounting seat (1005); and an infusion tube (1007) is provided between the valve (1003) and the mounting seat (1005).

8. A method for repair welding and cladding of the inner opening of a pipe body, using a repair welding and cladding device for the inner opening of a pipe body according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. When two sections of pipe bodies are butt-jointed, if the inner edge misalignment is greater than 1 mm, a repair welding device is used to form a repair welding layer (3); S2, assisting the welding of the welding gun by means of a welding gun support assembly (8), during the welding process, controlling the width of the repair welding cladding layer (3) by means of a positioning assembly (6), monitoring the interlayer temperature and surface morphology of the repair welding cladding layer (3) in real time by means of a monitoring assembly (7), controlling the angle between the repair welding cladding layer (3) and the axis of the pipe body by means of a monitoring cooling integrated assembly (9), and using air cooling to control the interlayer temperature; S3. After welding is completed, the end face of the pipe body and the repair weld overlay layer (3) are polished.

9. A pipe body inner opening repair welding method according to claim 8, characterized in that: The width of the repair welding cladding layer (3) is 24-26 mm; The angle between the repair welding layer (3) and the axis of the pipe body is 14°±1°.

10. A pipe body inner opening repair welding method according to claim 8, characterized in that: The angle of the tube body end surface after grinding is 37°±3°.

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