Large-diameter cylindrical member inner wall surface welding device and welding method

Abstract

The application belongs to the technical field of automatic welding, and particularly relates to a large-diameter cylindrical inner wall welding device and a welding method thereof. The device comprises a driving roller frame, a driven roller frame, a feeding mechanism and a welding assembly. The driving roller frame is driven by a motor and a speed reducer, and is provided with a ball screw to realize accurate position adjustment. Meanwhile, the device is provided with a cutting and welding material. The feeding mechanism comprises a hydraulic cylinder, a working support table and a guide rail push plate. The whole device is driven to work by the movement of the hydraulic cylinder. The welding assembly comprises a transformer, an electrode plate and a roller frame, and cooperates with each other to weld the large-diameter cylindrical workpiece. The welding method provided by the application adjusts the driving roller frame, the driven roller frame and the feeding mechanism, so that the welding assembly is welded. Finally, the cutting knife is adjusted to cut off the welding material. The application can bear and weld cylindrical workpieces with different diameters, so that the workpiece rotates at a uniform speed. The thin sheet welding material is welded on the surface of the workpiece by electric current, so that the overall quality of the welding product is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic welding, and in particular relates to a device for welding the inner wall of a large-diameter cylindrical part and a welding method thereof. Background Art

[0002] As an indispensable and critical tool in modern industrial manufacturing, welding equipment's development and technological innovation have consistently paralleled the progress of industrial civilization. Early welding equipment relied primarily on manual operation, with a relatively simple structure and limited functionality. With the continuous advancement of industrial technology, welding equipment has gradually become mechanized and automated, significantly improving production efficiency and quality. With the introduction of advanced technologies such as computer technology, sensor technology, and control technology, welding equipment has begun to develop in an intelligent and digital direction, facilitating equipment maintenance and management and significantly improving welding precision and efficiency. The application of big data technology helps companies better understand the operating status of welding equipment, optimize welding processes, and improve production efficiency.

[0003] In terms of technological innovation in welding equipment, significant progress has been made in the research and application of welding power sources, welding processes, and welding materials. For example, the advent of inverter welding power sources has made welding equipment more energy-efficient and environmentally friendly. The application of new welding processes such as laser welding and plasma welding has enabled precise and rapid welding of material surfaces. Compared to traditional welding methods, new surface welding technologies offer advantages such as a smaller heat-affected zone, faster welding speeds, and higher weld quality, making them particularly suitable for applications with stringent welding quality requirements. Furthermore, the development of new welding materials has enabled welding equipment to adapt to a wider variety of materials and more complex working conditions.

[0004] However, the current problem is that there is no equipment that can quickly weld materials on the surface of large cylindrical parts. In the past, welding materials for cylindrical workpieces was either done by laser cladding, which covered the welding material on the workpiece surface, which was a slow method, or by traditional welding, which attached the welding material to the workpiece surface in the form of a thin sheet and then only welded the joints. In this way, the contact between the welded workpiece and the welding material was insufficient, and the weld was not reliable. Summary of the Invention

[0005] In response to the above situation, the present invention provides a large-diameter cylindrical inner wall welding device and a welding method thereof, which overcome the shortcomings of the existing technology. Using the butt welding principle, electrodes are connected to the workpiece surface and the thin sheet material, and then the two are brought into contact by pressing. The current forms a loop, so that the thin sheet material is welded to the inner surface of the cylindrical workpiece under the action of the current. The entire welding process is then completed by the feeding device using an axial or circumferential working mode, thereby improving the welding efficiency and ensuring the welding quality of the welding material on the workpiece surface.

[0006] The technical solution adopted by the present invention is to provide a large-diameter cylindrical part inner wall welding device, which includes an active roller frame, a driven roller frame, a feeding mechanism and a welding assembly. The active roller frame specifically includes a first roller frame body, a first roller support frame, a first rubber roller, a first linear guide track, a first linear guide slider, a first linear guide slide, a motor, a reducer and a first turning tool fixing frame. The motor and the reducer are installed on the first linear guide slide, the motor output shaft is connected to the reducer, the reducer output shaft is connected to the first rubber roller, the first linear guide slide is installed on the first linear guide track through the first linear guide slider, the first linear guide track is arranged on the first roller frame body, and the second end of the first linear guide slide is provided with a first turning tool fixing frame.

[0007] The driven roller frame includes a second roller frame body, a second roller support frame, a second rubber roller, a second linear guide track, a second linear guide slider, a second linear guide slide and a second turning tool fixing frame. The second linear guide slide is provided with a second roller support frame, and the second rubber roller is installed on the second roller support frame. The second linear guide slide is installed on the second linear guide track through the second linear guide slider. The second linear guide track is provided on the second roller frame body, and the second end of the second linear guide slide is provided with a first turning tool fixing frame.

[0008] The feeding mechanism includes a hydraulic cylinder support platform, a foot seat, a hydraulic cylinder, a slider, a slide rail, a guide rail push plate, a welding box, a working support platform, a liquid tank and a guide platform. The first end of the piston rod of the hydraulic cylinder is connected to the guide rail push plate through a self-locking nut, and the guide rail push plate is arranged at the first end of the guide platform. The welding box is fixedly arranged on the guide platform, and the first end of the welding box is provided with a liquid tank. The foot seat of the hydraulic cylinder is installed at the first end of the base plate through the hydraulic cylinder support platform, and the second end of the base plate is provided with a slide rail. The guide platform is installed on the slide rail through the slider, and the working support platform is arranged on the second side of the welding box. The working support platform is connected to the second end of the guide shaft extending out of the welding box. The first end of the guide shaft is connected to the welding box through a lock nut. The first side of the working support platform is provided with a welding hydraulic cylinder, and the second side is provided with a cutting knife and a welding quality detector.

[0009] The welding assembly includes an electrode plate connector, a roller frame, a first electrode plate, a second electrode plate, a transformer, a semi-annular electrode plate connector, a pressure roller, a feed roller and a conductive roller. The first electrode plate is arranged on the first end face of the guide platform, the second electrode plate is arranged on the welding box, the second end of the roller frame is equipped with a pressure roller, a feed roller and a conductive roller, the first end of the first electrode plate is connected to the transformer through a wire, the second end of the first electrode plate is provided with an electrode plate connector, the first end of the second electrode plate is connected to the transformer through a wire, the second end of the second electrode plate is provided with a semi-annular electrode plate connector, and the second electrode plate is installed on the work support table.

[0010] Preferably, a motor support platform is provided at the first end of the first linear guide slide, the motor is installed at the first end of the motor support platform, the reducer is installed at the second end of the motor support platform, the output shaft of the motor is connected to the input flange, the output flange is connected to the input shaft of the reducer, the input flange and the output flange are connected by bolts, the output shaft of the reducer passes through the first roller support frame and is connected to the first rubber roller by a key, and a bearing end cover is installed on the rotating shaft of the first rubber roller.

[0011] Preferably, the first roller support frame, the first rubber roller, the first linear guide slide, the motor and the reducer are respectively provided in two sets and are symmetrically installed at the first end and the second end of the first roller frame body.

[0012] Preferably, the second roller support frame, the second rubber roller and the second linear guide slide are respectively provided in two sets and are symmetrically installed at the first end and the second end of the second roller frame body.

[0013] Preferably, a first ball screw is provided on the first roller frame body, wherein the fixed end of the first ball screw is provided at a first side position of the first roller frame body, the supporting end of the first ball screw is provided at a middle position of the first roller frame body and is fixedly connected to the first roller frame body through a first angle joint, the first nut seat of the first ball screw is installed on the first end face of the first linear guide slide, the second end of the first ball screw is installed on the first roller frame body through a first ball bearing, the first end of the first ball screw is connected to the first servo motor through a first coupling, and the first servo motor is installed on the first roller frame body through a first motor fixing plate.

[0014] Preferably, a second ball screw is provided on the second roller frame body, wherein the fixed end of the second ball screw is arranged at the first side position of the second roller frame body, the supporting end of the second ball screw is arranged at the middle position of the second roller frame body and is fixedly connected to the second roller frame body through a second angle joint, the second nut seat of the second ball screw is installed on the first end face of the second linear guide slide, the second end of the second ball screw is installed on the second roller frame body through a second ball bearing, the first end of the second ball screw is connected to the second servo motor through a second coupling, and the second servo motor is installed on the second roller frame body through a second motor fixing plate.

[0015] Preferably, a transformer is installed on the guide platform, the output pressure pipe of the liquid tank is connected to the hydraulic cylinder, an electric box is installed on the second end face of the welding box, a notch is provided on the first side of the welding box, criss-cross ribs are provided inside the welding box, a first linear bearing is provided between the guide shaft and the welding box, the working support table is provided with an open box structure, and the welding hydraulic cylinder is provided at the center of the working support table.

[0016] Preferably, the welding hydraulic cylinder is connected to the roller frame through a roller frame connecting plate, a second linear bearing is provided between the roller frame and the second end of the work support platform, the welding hydraulic cylinder piston rod is embedded in the second linear bearing, and the roller frame connecting plate can rotate 90° around the axis.

[0017] Furthermore, preferably, the conductive roller is set to a conductive material, the pressure roller and the feed roller are set to an insulating material, the electrode plate materials of the first electrode plate and the second electrode plate are both copper, and the end surfaces of the first electrode plate and the second electrode plate in contact with the welding box are both wrapped with insulating material.

[0018] A second aspect of the present invention provides a welding method for a large-diameter cylindrical inner wall welding device, comprising the following steps:

[0019] S1: Adjust the driving roller frame and the driven roller frame so that the large cylindrical part is placed on them;

[0020] S2: placing the sheet material to be welded on the feed roller so that the starting end of the welded sheet material passes through the conductive roller;

[0021] S3: Start the feeding mechanism and adjust the welding assembly so that the first electrode plate is in close contact with the outer surface edge of the large cylindrical member;

[0022] S4: The welding hydraulic cylinder adjusts the position of the conductive roller in the welding structure so that the conductive roller, the pressure roller, and the feed roller are in close contact with the inner surface edge of the large cylindrical member, and the rolling direction is along the circumferential direction. At the same time, the conductive roller presses the welding sheet material against the inner surface of the large cylindrical member;

[0023] S5: The transformer is energized, and current flows into the large cylindrical member and the conductive roller through the first electrode plate and the second electrode plate respectively, and starts to electrically heat the large cylindrical member and the conductive roller;

[0024] S6: When the temperature of the welding end surface of the large cylindrical part and the welding sheet material reaches the melting point, the motor in the active roller frame is started to make the large cylindrical part start to roll at a uniform speed, and at the same time, the hydraulic cylinder in the feeding mechanism is started to push the welding assembly to be fed radially along the large cylindrical part at a uniform speed;

[0025] S7: The large cylindrical member rotates at a constant speed, causing the welding material sheet on it to spread along the inner surface of the cylindrical member. The fluxing hydraulic cylinder always applies pressure to tightly compact the weld joint between the large cylindrical member and the welding material sheet, forming a good weld connection. The welding quality detector feeds synchronously to detect the welding effect. The feeding mechanism continues to work. The rotation of the large cylindrical member completes the spiral welding of the welding assembly. After welding is completed, execute step S8;

[0026] S8: When welding reaches the edge of the workpiece, the motors on the feed mechanism and the active roller frame stop working, the welding hydraulic cylinder on the work support table stops applying pressure, and the cutting knife arranged on the side of the work support table cuts off the welding sheet material;

[0027] S9: Start the hydraulic cylinder in the feeding mechanism to restore the welding assembly to its initial position;

[0028] S10: Start the welding edge cleaning device, adjust the angle of the first turning tool fixing frame, and perform cutting cleaning on the welding portion of the edge of the workpiece to remove the residue generated by welding.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] 1. The present invention can carry out load-bearing welding on cylindrical parts of different diameters and can provide the uniform rotation required for the workpieces to complete welding.

[0031] 2. The present invention is specially designed for surface welding of large cylindrical parts. It can efficiently weld thin sheet welding materials to the surface of the workpiece through electric current, achieve close fit between the welding material and the workpiece surface, and improve the overall quality of the welding product.

[0032] 3. The present invention can adopt two different welding methods by adjusting the direction of the roller frame and replacing the rollers, one is working along the circumferential direction, and the other is working along the axial direction of the workpiece.

[0033] 4. The present invention can ensure that the overlap degree of welding materials is always consistent, and the overlapping parts of welding materials do not affect the welding quality.

[0034] 5. The present invention is equipped with a welding quality detector, which can follow up the welding process in real time, achieve full coverage monitoring of the welding process, and ensure the welding effect and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a first view of the inner wall welding device of a large-diameter cylindrical member according to the present invention;

[0036] Figure 2 This is a first cross-sectional view of the device for welding the inner wall of a large-diameter cylindrical member according to the present invention;

[0037] Figure 3 A second view of the inner wall welding device for a large-diameter cylindrical member according to the present invention;

[0038] Figure 4 Schematic diagram of the active roller frame of the large-diameter cylindrical inner wall welding device of the present invention;

[0039] Figure 5 Schematic diagram of the driven roller frame of the large-diameter cylindrical inner wall welding device of the present invention;

[0040] Figure 6 This is a first schematic diagram of the feeding mechanism of the large-diameter cylindrical inner wall welding device of the present invention;

[0041] Figure 7 This is a second schematic diagram of the feeding mechanism of the large-diameter cylindrical inner wall welding device of the present invention;

[0042] Figure 8 A first view of the welding assembly of the large-diameter cylindrical inner wall welding device of the present invention;

[0043] Figure 9 A second view of the welding assembly of the large-diameter cylindrical inner wall welding device of the present invention;

[0044] Figure 10 The figure is a flow chart of the welding method of the large-diameter cylindrical part inner wall welding device of the present invention. DETAILED DESCRIPTION

[0045] To fully describe the technical content, structural features, objectives and effects of the present invention, the following is a detailed description with reference to the accompanying drawings.

[0046] The present invention provides a device for welding the inner wall of a large diameter cylindrical part. Figures 1 to 9 As shown, the large-diameter cylindrical part provided by the present invention refers to a cylindrical part with an inner diameter of 3.5m to 4.5m and a wall thickness of 0.15m to 0.3m, including an active roller frame 101, a driven roller frame 102, a feeding mechanism 103 and a welding assembly 104. The active roller frame 101 specifically includes a first roller frame body 13, a first roller support frame 14, a first rubber roller 15, a first linear guide track 18, a first linear guide slider 19, a first linear guide slide 20, The motor 22, the reducer 24 and the first turning tool fixing frame 48 are installed on the first linear guide slide 20. The output shaft of the motor 22 is connected to the reducer 24. The output shaft of the reducer 24 is connected to the first rubber roller 15. The first linear guide slide 20 is installed on the first linear guide track 18 through the first linear guide slider 19. The first linear guide track 18 is set on the first roller frame body 13. The second end of the first linear guide slide 20 is provided with the first turning tool fixing frame 48.

[0047] The driven roller frame 102 includes a second roller frame body 131, a second roller support frame 141, a second rubber roller 151, a second linear guide track 181, a second linear guide slider 191, a second linear guide slide 201 and a second turning tool fixing frame 481. The second linear guide slide 201 is provided with a second roller support frame 141, and the second rubber roller 151 is installed on the second roller support frame 141. The second linear guide slide 201 is installed on the second linear guide track 181 through the second linear guide slider 191. The second linear guide track 181 is provided on the second roller frame body 131, and the second end of the second linear guide slide 201 is provided with a first turning tool fixing frame 481.

[0048] The feeding mechanism 103 includes a hydraulic cylinder support platform 2, a foot seat 3, a hydraulic cylinder 4, a slider 6, a slide rail 7, a guide rail push plate 8, a welding box 11, a working support platform 29, a liquid tank 10 and a guide platform 51. The first end of the piston rod 5 of the hydraulic cylinder 4 is fixedly connected to the guide rail push plate 8 through a self-locking nut 9. The guide rail push plate 8 is arranged at the first end of the guide platform 51. The guide platform 51 is fixedly provided with a welding box 11. The first end of the welding box 11 is provided with a liquid tank 10. The foot seat 3 of the hydraulic cylinder 4 is connected to the guide rail push plate 8 through a self-locking nut 9. The support platform 2 is installed at the first end of the base plate 1, and the second end of the base plate 1 is provided with a slide rail 7. The guide platform 51 is installed on the slide rail 7 through the slider 6. The working support platform 29 is provided on the second side of the welding box 11. The working support platform is connected to the second end of the guide shaft 30 extending out of the welding box 11. The first end of the guide shaft 30 is connected to the welding box 11 through the anti-loosening nut 35. The first side of the working support platform 29 is provided with a welding hydraulic cylinder 28, and the second side is installed with a cutting knife 49 and a welding quality detector 50.

[0049] The welding assembly 104 includes an electrode plate connector 25, a roller frame 26, a first electrode plate 32, a second electrode plate 33, a transformer 34, a semi-annular electrode plate connector 45, a pressure roller 461, a feed roller 463 and a conductive roller 462. The first electrode plate 32 is arranged on the first end face of the guide platform 51, and the second electrode plate 33 is arranged on the welding box 11. The second end of the roller frame 26 is equipped with a pressure roller 461, a feed roller 463 and a conductive roller 462. The first end of the first electrode plate 32 is connected to the transformer 34 through a wire, and the second end of the first electrode plate 32 is provided with an electrode plate connector 25. The first end of the second electrode plate 33 is connected to the transformer 34 through a wire, and the second end of the second electrode plate 33 is provided with a semi-annular electrode plate connector 45. The second electrode plate 33 is installed on the work support table 29.

[0050] A motor support platform 21 is provided at the first end of the first linear guide slide 20, the motor 22 is installed at the first end of the motor support platform 21, the reducer 24 is installed at the second end of the motor support platform 21, the output shaft of the motor 22 is connected to the input flange 23, the output flange 44 is connected to the input shaft of the reducer 24, the input flange 23 and the output flange 44 are connected by bolts, the output shaft of the reducer 24 passes through the first roller support frame 14 and is connected to the first rubber roller 15 by a key, and a bearing end cover 36 is installed on the rotating shaft of the first rubber roller 15.

[0051] The first roller support frame 14 , the first rubber roller 15 , the first linear guide slide 20 , the motor 22 and the reducer 24 are respectively provided in two sets and are symmetrically mounted on the first end and the second end of the first roller frame body 13 .

[0052] The second roller support frame 141 , the second rubber roller 151 and the second linear guide rail slide 201 are respectively provided in two sets and are symmetrically mounted at the first end and the second end of the second roller frame body 131 .

[0053] A first ball screw 43 is provided on the first roller frame body 13, wherein the first ball screw fixed end 16 is provided at a first side position of the first roller frame body 13, the first ball screw supporting end 41 is provided at a middle position of the first roller frame body 13 and is fixedly connected to the first roller frame body 13 through a first angle joint 42, the first nut seat 39 of the first ball screw 43 is installed on the first end face of the first linear guide slide 20, the second end of the first ball screw 43 is installed on the first roller frame body 13 through the first ball bearing 40, the first end of the first ball screw 43 is connected to the first servo motor 17 through the first coupling 37, and the first servo motor 17 is installed on the first roller frame body 13 through the first motor fixing plate 38.

[0054] A second ball screw 431 is provided on the second roller frame body 131, wherein the second ball screw fixed end 161 is arranged at the first side position of the second roller frame body 131, the second ball screw supporting end 411 is arranged at the middle position of the second roller frame body 131 and is fixedly connected to the second roller frame body 131 through the second angle joint 421, the second nut seat 391 of the second ball screw 431 is installed on the first end face of the second linear guide slide 201, the second end of the second ball screw 431 is installed on the second roller frame body 131 through the second ball bearing 401, the first end of the second ball screw 431 is connected to the second servo motor 171 through the second coupling 371, and the second servo motor 171 is installed on the second roller frame body 131 through the second motor fixing plate 381.

[0055] A transformer 34 is installed on the guide platform 51, the output pressure pipe 52 of the liquid tank 10 is connected to the hydraulic cylinder 4, an electric box 47 is installed on the second end face of the welding box 11, a notch 53 is provided on the first side of the welding box 11, and crisscross ribs 54 are provided inside the welding box 11. A first linear bearing 31 is provided between the guide shaft 30 and the welding box 11.

[0056] The work support platform 29 is configured as an open box structure, and the fluxing hydraulic cylinder 28 is disposed at the center of the work support platform 29 .

[0057] The welding hydraulic cylinder 28 is connected to the roller frame 26 through the roller frame connecting plate 27. A second linear bearing 311 is arranged between the roller frame 26 and the second end of the work support platform 29. The welding hydraulic cylinder piston rod 281 is embedded in the second linear bearing 311. The roller frame connecting plate 27 can rotate 90° around the axis. The conductive roller 462 is set to a conductive material, the pressure roller 461 and the feed roller 463 are set to an insulating material, the electrode plate materials of the first electrode plate 32 and the second electrode plate 33 are both copper, and the end surfaces of the first electrode plate 32 and the second electrode plate 33 that are in contact with the welding box 11 are both wrapped with insulating material.

[0058] like Figure 10 As shown, the welding method of the large-diameter cylindrical part inner wall welding device of the present invention includes the following steps:

[0059] S1: Adjust the driving roller frame 101 and the driven roller frame 102 so that the large cylindrical member 12 is placed thereon.

[0060] S2: The sheet material to be welded is placed on the feeding roller 463 , and the starting end of the welded sheet material passes through the conductive roller 462 .

[0061] S3: Start the feeding mechanism 103 and adjust the welding assembly 104 so that the first electrode plate is in close contact with the edge of the outer surface of the large cylindrical member 12 .

[0062] S4: The welding hydraulic cylinder 28 adjusts the position of the conductive roller 462 in the welding structure so that the conductive roller 462, the pressure roller 461, and the feed roller 463 are all in close contact with the inner surface edge of the large cylindrical part 12, and the rolling direction is along the circumferential direction. At the same time, the conductive roller 462 presses the welding sheet material against the inner surface of the large cylindrical part 12.

[0063] S5: The transformer 34 is energized, and current flows into the large cylindrical member 12 and the conductive roller 462 through the first electrode plate 32 and the second electrode plate 33 respectively, and the large cylindrical member 12 and the conductive roller 462 begin to be electrically heated.

[0064] S6: When the temperature of the welding end surface of the large cylindrical part 12 and the welding sheet material reaches the melting point, the motor 22 in the active roller frame 101 is started to make the large cylindrical part 12 start to roll at a uniform speed, and at the same time, the hydraulic cylinder 4 in the feeding mechanism 103 is started to push the welding assembly 104 to feed radially along the large cylindrical part 12 at a uniform speed.

[0065] S7: The large cylindrical part 12 rotates at a uniform speed, so that the welding material sheet thereon is spread along the inner surface of the cylindrical part. The welding hydraulic cylinder 28 always applies pressure, so that the welding joint between the large cylindrical part 12 and the welding material sheet is tightly compacted to form a good welding connection. The welding quality detector 50 feeds synchronously to detect the welding effect. The feeding mechanism 103 works continuously. Through the rotation of the large cylindrical part 12, the welding assembly 104 completes the spiral welding work. After the welding is completed, execute step S8.

[0066] S8: When welding to the edge of the workpiece, the motor 22 on the feeding mechanism 103 and the active roller frame 101 stops working, the welding hydraulic cylinder 28 on the work support table 29 stops applying pressure, and the cutting knife 49 arranged on the side of the work support table 29 cuts off the welding sheet material.

[0067] S9: Start the hydraulic cylinder 4 in the feeding mechanism 103 to restore the welding assembly 104 to its initial position.

[0068] S10: Start the welding edge cleaning device, adjust the angle of the first turning tool fixing frame 48, and perform cutting cleaning on the welding portion of the workpiece edge to remove the residue generated by welding.

[0069] Specifically, in the first embodiment of the present invention, first, the large cylindrical part 12 is placed on the active roller frame 101 and the driven roller frame 102, the feeding mechanism 103 starts to start, the hydraulic cylinder 4 starts to work, and the piston rod 5 pushes the guide rail push plate 8 to move, driving the first electrode plate 32 and the second electrode plate 33 on the slide rail 7 and the work support platform 29 to move. After the electrode plate connector 25 of the first electrode plate 32 moves to the bottom of the large cylindrical part 12, it is ensured that it is in close contact with the outer surface of the large cylindrical part 12 so that the current can be smoothly conducted. When the roller frame 26 moves to the upper inner side of the large cylindrical part 12, the welding hydraulic cylinder 28 starts working, applying pressure to the roller frame 26 to complete the welding operation, and then the motor 22 in the active roller frame 101 starts to run, and the first rubber roller 15 in the active roller frame 101 drives the large cylindrical part 12 to start rolling at a uniform speed. The feed roller 463 in the roller frame 26 starts to rotate under the drive of the large cylindrical part 12, so that the welding material sheet thereon spreads along the inner surface of the large cylindrical part 12, and the conductive roller 462 transmits current to the welding material sheet under the current input of the second electrode plate 33. The electrode plate connector 25 of the first electrode plate 32 and the conductive roller 462 form a loop through the welding material sheet and the large cylindrical part 12. Under the pressing action of the clamping roller 461, the welding material sheet is welded to the inner surface of the large cylindrical part 12, and the feeding mechanism 103 continues to work, and through the rotation of the large cylindrical part 12, the welding structure completes the spiral welding work. When welding to the edge of the workpiece, the feeding mechanism 103 stops working, the welding hydraulic cylinder 28 on the work support table 29 stops applying pressure, and the cutting knife 49 arranged on the side of the work support table 29 cuts off the welding material. At the same time, the first turning tool fixing frame 48 adjusts the angle to process the welding part of the edge of the workpiece.

[0070] In the second embodiment of the present invention, the roller frame 26 is removed from the roller frame connecting plate 27, rotated 90°, and then reinstalled on the roller frame connecting plate 27. The feed mechanism 103 propels the first electrode plate 32, the second electrode plate 33, and the work support 29 along the inside of the large cylindrical member 12 in a straight line. Under the action of the fluxing hydraulic cylinder 28, the conductive roller 462, the pressure roller 461, and the feed roller 463 begin welding, welding from the first side of the large cylindrical member 12 to the second side. The fluxing hydraulic cylinder 28 pauses, and the cutting blade 49 cuts the welding material. At this point, the motor 22 on the active roller frame 101 begins operating, rotating the large cylindrical member 12 a certain angle. The fluxing hydraulic cylinder 28 resumes operation, and the hydraulic cylinder 4 begins its return stroke, driving the first electrode plate 32, the second electrode plate 33, and the work support 29 in the opposite direction, completing the welding process. After the welding process is completed, the turning tool arranged on the first roller frame body 13 begins adjusting its angle and working to process the edge of the welded workpiece. The present invention is suitable for welding surface metal materials of various large cylindrical parts, for welding cylindrical parts with special requirements for surface materials or surface properties, and for welding cylindrical workpieces of various lengths and diameters.

[0071] The above description is a preferred embodiment of the present application, which does not limit the scope of protection of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of this technology, and these improvements and modifications should also be regarded as the scope of protection of this application.

Claims

1. A device for welding the inner wall of a large-diameter cylindrical part, characterized in that: Large diameter cylindrical parts refer to cylindrical parts with inner diameters between 3.5m and 4.5m and wall thickness between 0.15m and 0.3m, which include active roller frame, driven roller frame, feeding mechanism and welding components. The active roller frame includes a first roller frame body, a first roller support frame, a first rubber roller, a first linear guide track, a first linear guide slider, a first linear guide slide, a motor, a reducer and a first turning tool fixing frame, the motor and the reducer are mounted on the first linear guide slide, the motor output shaft is connected to the reducer, the reducer output shaft is connected to the first rubber roller, the first linear guide slide is mounted on the first linear guide track through the first linear guide slider, the first linear guide track is set on the first roller frame body, and the second end of the first linear guide slide is provided with a first turning tool fixing frame; The driven roller frame includes a second roller frame body, a second roller support frame, a second rubber roller, a second linear guide track, a second linear guide slider, a second linear guide slide and a second turning tool fixing frame, the second linear guide slide is provided with a second roller support frame, the second roller support frame is mounted on the second rubber roller, the second linear guide slide is mounted on the second linear guide track through the second linear guide slider, the second linear guide track is provided on the second roller frame body, and the second end of the second linear guide slide is provided with a first turning tool fixing frame; The feeding mechanism includes a hydraulic cylinder support platform, a foot seat, a hydraulic cylinder, a slider, a slide rail, a guide rail push plate, a welding box, a working support platform, a liquid tank and a guide platform. The first end of the piston rod of the hydraulic cylinder is connected to the guide rail push plate through a self-locking nut. The guide rail push plate is arranged at the first end of the guide platform. The welding box is fixedly arranged on the guide platform. The first end of the welding box is provided with a liquid tank. The foot seat of the hydraulic cylinder is installed at the first end of the base plate through the hydraulic cylinder support platform. The second end of the base plate is provided with a slide rail. The guide platform is installed on the slide rail through the slider. The working support platform is arranged on the second side of the welding box. The working support platform is connected to the second end of the guide shaft extending out of the welding box. The first end of the guide shaft is connected to the welding box through a lock nut. The first side of the working support platform is provided with a welding hydraulic cylinder, and the second side is provided with a cutting knife and a welding quality detector. The welding assembly includes an electrode plate connector, a roller frame, a first electrode plate, a second electrode plate, a transformer, a semi-annular electrode plate connector, a pressure roller, a feed roller and a conductive roller. The first electrode plate is arranged on the first end face of the guide platform, the second electrode plate is arranged on the welding box, the second end of the roller frame is equipped with a pressure roller, a feed roller and a conductive roller, the first end of the first electrode plate is connected to the transformer through a wire, the second end of the first electrode plate is provided with an electrode plate connector, the first end of the second electrode plate is connected to the transformer through a wire, the second end of the second electrode plate is provided with a semi-annular electrode plate connector, and the second electrode plate is installed on the work support table.

2. The large diameter cylindrical part inner wall welding device according to claim 1, characterized in that: A motor support platform is provided at the first end of the first linear guide slide, the motor is installed at the first end of the motor support platform, the reducer is installed at the second end of the motor support platform, the output shaft of the motor is connected to the input flange, the output flange is connected to the input shaft of the reducer, the input flange and the output flange are connected by bolts, the output shaft of the reducer passes through the first roller support frame and is connected to the first rubber roller by a key, and a bearing end cover is installed on the rotating shaft of the first rubber roller.

3. The large diameter cylindrical part inner wall welding device according to claim 1 or 2, characterized in that: The first roller support frame, the first rubber roller, the first linear guide slide, the motor and the reducer are respectively provided in two sets and are symmetrically installed at the first end and the second end of the first roller frame body.

4. The large diameter cylindrical part inner wall welding device according to claim 1, characterized in that: The second roller support frame, the second rubber roller and the second linear guide rail slide are respectively provided in two sets and are symmetrically installed at the first end and the second end of the second roller frame body.

5. The large diameter cylindrical part inner wall welding device according to claim 1, characterized in that: A first ball screw is provided on the first roller frame body, wherein the fixed end of the first ball screw is provided at a first side position of the first roller frame body, the supporting end of the first ball screw is provided at a middle position of the first roller frame body and is fixedly connected to the first roller frame body through a first angle joint, the first nut seat of the first ball screw is installed on the first end face of the first linear guide slide, the second end of the first ball screw is installed on the first roller frame body through a first ball bearing, the first end of the first ball screw is connected to the first servo motor through a first coupling, and the first servo motor is installed on the first roller frame body through a first motor fixing plate.

6. The large diameter cylindrical part inner wall welding device according to claim 1, characterized in that: A second ball screw is provided on the second roller frame body, wherein the fixed end of the second ball screw is arranged at a first side position of the second roller frame body, the supporting end of the second ball screw is arranged at a middle position of the second roller frame body and is fixedly connected to the second roller frame body through a second angle joint, the second nut seat of the second ball screw is installed on the first end face of the second linear guide slide, the second end of the second ball screw is installed on the second roller frame body through a second ball bearing, the first end of the second ball screw is connected to the second servo motor through a second coupling, and the second servo motor is installed on the second roller frame body through a second motor fixing plate.

7. The large diameter cylindrical part inner wall welding device according to claim 1, characterized in that: A transformer is installed on the guide platform, the output pressure pipe of the liquid tank is connected to the hydraulic cylinder, an electric box is installed on the second end face of the welding box, a notch is provided on the first side of the welding box, crisscross ribs are provided inside the welding box, a first linear bearing is provided between the guide shaft and the welding box, the work support table is provided with an open box structure, and the welding hydraulic cylinder is provided in the center of the work support table.

8. The large diameter cylindrical part inner wall welding device according to claim 1, characterized in that: The welding hydraulic cylinder is connected to the roller frame through a roller frame connecting plate. A second linear bearing is provided between the roller frame and the second end of the work support platform. The welding hydraulic cylinder piston rod is embedded in the second linear bearing. The roller frame connecting plate can rotate 90° around the axis.

9. The large diameter cylindrical part inner wall welding device according to claim 1, characterized in that: The conductive roller is set to conductive material, the pressure roller and the feed roller are set to insulating material, the electrode plate materials of the first electrode plate and the second electrode plate are both copper, and the end surfaces of the first electrode plate and the second electrode plate in contact with the welding box are wrapped with insulating material.

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