A plasma welding device for the production of offshore wind power towers

Abstract

The present invention relates to the technical field of welding equipment, and particularly to a plasma welding equipment for the production of offshore wind power towers, including a tower barrel, and further comprising: a lifting mechanism for supporting the tower barrel and preheating before welding and reheating after welding of the tower barrel; a transmission bevel gear ring driven by a servo motor; a moving frame driven by a linear transmission module; an integral circle frame, a grinding frame and two symmetrically arranged driving frames are respectively slidably installed on the moving frame; two integral circle rollers are rotatably installed on the integral circle frame; and two grinding rollers are rotatably installed on the inner wall of the grinding frame. The present invention realizes comprehensive and key pretreatment and post-treatment of the tower barrel through the lifting mechanism. Before welding, the electric heating rollers of the lifting mechanism are used to preheat the tower barrel to 80°C - 120°C, effectively reducing the thermal stress during welding and reducing welding defects.

Description

Technical Field

[0001] The present invention relates to the technical field of welding equipment, and particularly to a plasma welding equipment for the production of offshore wind power towers. Background Art

[0002] As a clean and renewable energy technology, offshore wind power has developed rapidly worldwide.

[0003] With the development of the industry, the production efficiency of traditional manually welded wind power towers is low, and modern industry has begun to use plasma welding devices to improve production and processing efficiency.

[0004] In the prior art, the following problems exist:

[0005] 1. Lack of effective pre-treatment and post-treatment: Existing welding equipment lacks the preheating and pre-grinding steps for the tower barrel before welding, and lacks the process of eliminating the reheat stress of the tower barrel after welding, as well as the functions of roundness fixing of the welded barrel and grinding of the weld seam;

[0006] 2. Difficult to precisely control the welding process: During the welding process, existing equipment is difficult to precisely control the welding position and welding parameters, making it easy to have welding defects during welding, such as uneven weld seams and insecure welding, seriously affecting the welding quality;

[0007] 3. Poor stability during tower barrel welding:

[0008] 4. Incomplete and inaccurate weld quality inspection;

[0009] Based on this, we propose a plasma welding equipment for the production of offshore wind power towers to solve the technical problems raised in the above background art. Summary of the Invention

[0010] The purpose of the present invention is to solve the drawbacks in the background art, and propose a plasma welding equipment for the production of offshore wind power towers.

[0011] To achieve the above object, the technical solution adopted by the present invention is: A plasma welding equipment for the production of offshore wind power towers, including a tower barrel, and further including:

[0012] A lifting mechanism for supporting the tower barrel and preheating before welding and reheating after welding of the tower barrel;

[0013] A transmission bevel gear ring driven by a servo motor;

[0014] A moving frame driven by a linear transmission module, on which a roundness fixing frame, a grinding frame and two symmetrically arranged driving frames are respectively slidably installed;

[0015] Two full-circle rollers are rotatably mounted on the full-circle frame, two grinding rollers are rotatably mounted on the inner wall of the grinding frame, a first linkage module linked with the transmission bevel gear ring is mounted at the tail of the grinding frame, an external welding gun is mounted on the full-circle frame, an internal welding gun is mounted on the grinding frame, and a laser displacement sensor and a visual acquisition probe are mounted on both the full-circle frame and the grinding frame;

[0016] A limit frame is slidably mounted on the driving frame, a group of balls are embedded on the side of the limit frame facing the tower, a tightening spring is installed between the driving frame and the limit frame, two rubber clamping rollers are rotatably mounted on the driving frame, and a second linkage module linked with the transmission bevel gear ring is installed at the tail of the driving frame;

[0017] Synchronous expansion mechanism, used to synchronously change the positions of the full circle frame, grinding frame and driving frame on the moving frame;

[0018] The vibration monitoring mechanism is used to detect the vibration pressure of the tower after welding.

[0019] Preferably, it also includes a base frame, on which a single-chip microcomputer and a plasma welder are installed, the outer welding gun and the inner welding gun are connected to the plasma welder through pipelines, the linear transmission module is installed on the base frame, the laser displacement sensor and the visual acquisition probe on the outer welding gun and the full-circle frame are both arranged on the outside of the tower, and the laser displacement sensor and the visual acquisition probe on the inner welding gun and the grinding frame are both arranged on the inside of the tower.

[0020] Preferably, the lifting mechanism includes a first bidirectional screw rotatably connected to a base frame, a first motor is mounted on the base frame, an output shaft end of the first motor is fixedly connected to the first bidirectional screw, a first positive thread segment and a first negative thread segment are respectively provided on the first bidirectional screw, a bracket is transmission-mounted on both the first positive thread segment and the first negative thread segment, an inner wall of the bracket is rotatably connected to an electric heating roller, an electric heating rod is built into the electric heating roller, and the temperature range of the electric heating rod is 80°C-120°C.

[0021] Preferably, a gear cylinder is rotatably mounted on the inner wall of the movable frame, the transmission bevel gear ring is fixedly mounted on the gear cylinder, and the output shaft end of the servo motor is transmission-connected to the gear cylinder via a first belt.

[0022] Preferably, the synchronous expansion mechanism includes a second bidirectional screw rotatably connected to the gear cylinder, a second motor is installed on the movable frame, the output shaft end of the second motor is transmission connected to the second bidirectional screw through a second belt, the second bidirectional screw is respectively provided with a second positive thread segment and a second negative thread segment, an expansion block is transmission-mounted on the second positive thread segment and the second negative thread segment, and a connecting rod is hinged between the driving frame and the two expansion blocks, between the full circle frame and the two expansion blocks, and between the driving frame and the two expansion blocks.

[0023] Preferably, the first linkage module includes a coupling fixedly installed at the tail of a grinding roller and a first bushing rotatably connected to the grinding frame. First bevel gears are installed on both the first bushing and the coupling, and the two first bevel gears mesh with each other. A first spline shaft is rotatably installed on the moving frame, and a first driven bevel gear meshing with the transmission bevel gear ring is fixedly installed at the tail of the first spline shaft. The first sleeve shaft is driven by the first spline shaft.

[0024] Preferably, the second linkage module includes a square shaft rotatably connected to the driving frame. A square groove with both ends open and slidably connected to the square shaft is fixedly formed inside the rubber pinch roller. The cross-sections of both the square groove and the square shaft are regular hexagons. A second bushing is rotatably installed on the driving frame. Second bevel gears are installed on both the second bushing and the square shaft, and the two second bevel gears mesh with each other. A second spline shaft is rotatably installed on the moving frame. The second bushing is driven by the second spline shaft, and a second driven bevel gear meshing with the transmission bevel gear ring is fixedly installed at the tail end of the second spline shaft.

[0025] Preferably, a first spline groove with both ends open and slidably connected to the first spline shaft is fixedly formed inside the first bushing. A second spline groove with both ends open and slidably connected to the second spline shaft is fixedly formed inside the second bushing. The cross-sections of the first spline shaft, the second spline shaft, the first spline groove, and the second spline groove are all regular hexagons. The axes of the first spline shaft and the second spline shaft are both perpendicular to the axis of the tower barrel.

[0026] Preferably, the vibration monitoring mechanism includes a plurality of lifting push rods installed on the moving frame and a vibration frame arranged directly above the tower barrel. The movable end of each lifting push rod is fixedly connected to the vibration frame through an elastic block. Two vibration pressure rollers are rotatably installed on the inner wall of the vibration frame, and an excitation motor is installed on the vibration frame.

[0027] Preferably, treatment gaps adapted to the tower barrel are provided between the two rubber pinch rollers, between the two grinding rollers, and between the two full-round rollers. Steel wire soft bristles are evenly distributed on the grinding rollers. The axes of the rubber pinch rollers, the grinding rollers, and the full-round rollers are all parallel to the axis of the tower barrel. A movable frame is hinged to the bottom frame, a retaining roller for limiting the tower barrel is rotatably installed on the movable frame, and a positioning pin cooperating with the bottom frame is arranged on the movable frame.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention realizes comprehensive and key pre-treatment and post-treatment of the tower barrel through a lifting mechanism. Before welding, the electrothermal roller of the lifting mechanism is used to preheat the tower barrel to 80°C - 120°C, effectively reducing the thermal stress during welding, reducing welding defects, and improving welding quality. At the same time, before welding, the device can also complete the pre-grinding treatment of the part to be welded. After welding, the electrothermal roller is used again to reheat the tower barrel to eliminate welding residual stress and improve the weld microstructure. At the same time, after welding, the device can also complete the roundness shaping, roundness detection and grinding treatment of the weld. Through the realization of the above process, the welding effect of the tower barrel in the wind power tower is effectively improved.

[0030] 2. The present invention installs a laser displacement sensor and a vision acquisition probe on the roundness frame and the grinding frame respectively. During the welding process, the laser displacement sensor monitors the distance between the external welding torch and the internal welding torch and the tower barrel in real time, and the vision acquisition probe collects the image information of the tower barrel surface and the weld, and transmits this information to the single-chip microcomputer. The single-chip microcomputer accurately controls the operation of the external welding torch and the internal welding torch according to these data, realizing real-time monitoring and accurate control of the welding process, greatly reducing defects such as uneven welds and insecure welding, and significantly improving welding quality.

[0031] 3. Through the second linkage module on the driving frame, the present invention drives the rubber pinch roller to rotate during the welding process. The rubber pinch roller can not only drive the tower barrel to rotate, but also provide a stable supporting force for the tower barrel, effectively solving the problem of shaking of the tower barrel during welding, improving the stability of the tower barrel during welding, thereby improving welding quality and ensuring the reliability of the welding effect.

[0032] 4. The vibration monitoring mechanism of the present invention plays a key role after welding is completed. The vibration frame is lowered through the lifting push rod, the vibration pressure roller contacts the surface of the tower barrel, and the excitation motor drives the vibration pressure roller to apply vibration pressure to the tower barrel. According to the vibration response of the tower barrel, the weld quality and whether there are defects inside can be comprehensively and accurately judged, welding defects can be detected in time, ensuring the quality and safety of the tower barrel, and filling the gap in the weld quality detection of the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of a plasma welding device for producing an offshore wind power tower pole of the present invention;

[0034] Figure 2 is a schematic structural diagram of the moving frame and the roundness roller of the present invention;

[0035] Figure 3 is the present invention Figure 2 is a partial enlarged structural diagram at A in;

[0036] Figure 4Schematic diagram of the structure of the external welding torch and plasma welding machine of the present invention;

[0037] Figure 5 Of the present invention Figure 4 Schematic diagram of the enlarged partial structure at position B in the present invention;

[0038] Figure 6 Schematic diagram of the structure of the full-circle frame and laser displacement sensor of the present invention;

[0039] Figure 7 Schematic diagram of the structure of the connecting rod and grinding frame of the present invention;

[0040] Figure 8 Schematic diagram of the structure of the lifting push rod and vibrating frame of the present invention;

[0041] Figure 9 Schematic diagram of the structure of the driving frame and rubber pinch roller of the present invention;

[0042] Figure 10 Of the present invention Figure 9 Schematic diagram of the enlarged partial structure at position C in the present invention.

[0043] 1, tower barrel; 2, servo motor; 3, moving frame; 4, linear transmission module; 5, full-circle frame; 6, grinding frame; 7, driving frame; 8, full-circle roller; 9, grinding roller; 10, external welding torch; 11, internal welding torch; 12, laser displacement sensor; 13, visual acquisition probe; 14, limit frame; 15, ball; 16, abutting spring; 17, rubber pinch roller; 18, chassis; 19, single-chip microcomputer; 20, plasma welding machine; 21, first bidirectional lead screw; 22, bracket; 23, electric heating roller; 24, toothed cylinder; 25, second bidirectional lead screw; 27, expanding support block; 28, connecting rod; 29, coupling; 30, first bushing; 31, first splined shaft; 32, square shaft; 33, second bushing; 34, second splined shaft; 35, lifting push rod; 36, vibrating frame; 37, elastic block; 38, vibrating pressure roller; 39, excitation motor; 40, movable frame; 41, retaining roller. Detailed implementation manners

[0044] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations.

[0045] As Figures 1 - 10 shown, a plasma welding device for the production of an offshore wind power tower includes a tower barrel 1, and further includes:

[0046] A lifting mechanism for supporting the tower barrel 1 and preheating before welding and reheating after welding of the tower barrel 1;

[0047] The lifting mechanism includes a first bidirectional lead screw 21 rotatably connected to the chassis 18. A first motor is installed on the chassis 18, and the output shaft end of the first motor is fixedly connected to the first bidirectional lead screw 21. A first positive thread section and a first reverse thread section are respectively arranged on the first bidirectional lead screw 21. A bracket 22 is drivingly installed on both the first positive thread section and the first reverse thread section. The inner wall of the bracket 22 is rotatably connected to an electric heating roller 23. An electric heating rod is built into the electric heating roller 23, and the temperature of the electric heating rod is 100°C;

[0048] Before welding the tower barrel 1, start the first motor. The first motor drives the first bidirectional lead screw 21 to rotate. Due to the first positive thread section and the first reverse thread section on the first bidirectional lead screw 21, the two brackets 22 move towards each other on the first bidirectional lead screw 21, lifting the tower barrel 1 smoothly. At this time, the electric heating rod built into the electric heating roller 23 starts to work, controlling the temperature at 100°C to preheat the tower barrel 1, which can effectively reduce the thermal stress during welding, reduce welding defects, and improve the welding quality;

[0049] After welding is completed, the electric heating rod works again to reheat the tower barrel 1, which helps to eliminate the welding residual stress and improve the organizational structure of the weld. In the prior art, many welding devices do not have the processes of preheating and reheating the tower barrel 1, resulting in unstable welding quality. This solution solves this technical problem. Through a simple structural design, effective pre-treatment and post-treatment of the tower barrel 1 are achieved, improving the welding quality and overall performance of the tower barrel 1;

[0050] The transmission bevel gear ring is driven by a servo motor 2;

[0051] The moving frame 3 is driven by a linear transmission module 4. A full-circle frame 5, a grinding frame 6, and two symmetrically arranged driving frames 7 are respectively slidably installed on the moving frame 3;

[0052] A toothed cylinder 24 is rotatably installed on the inner wall of the moving frame 3. The transmission bevel gear ring is fixedly installed on the toothed cylinder 24, and the output shaft end of the servo motor 2 is drivingly connected to the toothed cylinder 24 through a first belt;

[0053] It also includes a chassis 18. A single-chip microcomputer 19 and a plasma welding machine 20 are installed on the chassis 18. The linear transmission module 4 is installed on the chassis 18;

[0054] Two full-circle rollers 8 are rotatably installed on the full-circle frame 5. Two grinding rollers 9 are rotatably installed on the inner wall of the grinding frame 6. A first linkage module linked to the transmission bevel gear ring is installed at the tail of the grinding frame 6. An external welding gun 10 is installed on the full-circle frame 5. An internal welding gun 11 is installed on the grinding frame 6. A laser displacement sensor 12 and a vision acquisition probe 13 are installed on both the full-circle frame 5 and the grinding frame 6;

[0055] Both the external welding torch 10 and the internal welding torch 11 are connected to the plasma welding machine 20 through pipelines. The external welding torch 10, the laser displacement sensor 12 and the vision acquisition probe 13 on the full-circle frame 5 are all arranged on the outer side of the tower barrel 1;

[0056] The internal welding torch 11, the laser displacement sensor 12 and the vision acquisition probe 13 on the grinding frame 6 are all arranged on the inner side of the tower barrel 1;

[0057] During welding, the moving frame 3 moves, and then changes the positions of the external welding torch 10 and the internal welding torch 11. By changing the positions of the external welding torch 10 and the internal welding torch 11, the external butt joint and the internal butt joint welding operations of the tower barrel 1 are carried out;

[0058] During welding, by setting the rotation angle of the tower barrel 1, the tower barrel 1 can be rotated, and then the switching between the external butt joint welding state and the internal butt joint welding state can be completed;

[0059] At the same time, before welding, the grinding roller 9 on the grinding frame 6 contacts the tower barrel 1 and performs preliminary grinding on the external butt joint and the internal butt joint. Through the preliminary grinding, it is convenient for subsequent welding operations;

[0060] After welding is completed, the moving frame 3 drives the laser displacement sensor 12 and the vision acquisition probe 13 to move along the axis direction of the tower barrel 1, and realizes the visual inspection of the internal weld and the external weld;

[0061] When the full-circle shaping is completed, the laser displacement sensor 12 works and performs full-circle detection on the inner and outer walls of the tower barrel 1;

[0062] During full-circle detection, the monitoring position of the laser displacement sensor 12 is switched periodically, and the tower barrel 1 rotates slowly. Then, after welding is completed, the all-round full-circle detection of the tower barrel 1 is realized;

[0063] And during welding, the laser displacement sensor 12 can monitor the distance between the external welding torch 10 and the internal welding torch 11 and the tower barrel 1 in real time. The vision acquisition probe 13 collects the image information of the surface and the weld of the tower barrel 1 and transmits this information to the single-chip microcomputer 19;

[0064] At the same time during welding, the single-chip microcomputer 19 controls the work of the external welding torch 10 and the internal welding torch 11 according to this information to achieve precise welding;

[0065] The external welding torch 10 welds the outer side of the tower barrel 1, and the internal welding torch 11 welds the inner side of the tower barrel 1 to ensure the comprehensiveness and quality of welding;

[0066] In the prior art, it is difficult to precisely control the welding position and welding parameters during the welding process, and welding defects are likely to occur. In this solution, by setting up a laser displacement sensor 12 and a vision acquisition probe 13, real-time monitoring and precise control of the welding process are achieved, solving the technical problem of difficult precise control of the welding position and parameters, greatly improving the welding quality, and reducing the occurrence of welding defects;

[0067] The first linkage module includes a coupling 29 fixedly installed at the tail of a grinding roller 9 and a first bushing 30 rotatably connected to a grinding frame 6. First bevel gears are installed on both the first bushing 30 and the coupling 29, and the two first bevel gears mesh with each other. A first spline shaft 31 is rotatably installed on a moving frame 3, and a first driven bevel gear meshing with a transmission bevel gear ring is fixedly installed at the tail of the first spline shaft 31. The first sleeve is driven by the first spline shaft 31;

[0068] When the transmission bevel gear ring rotates, it drives the first driven bevel gear meshing with it to rotate. The first driven bevel gear is fixed on the first spline shaft 31, thereby causing the first spline shaft 31 to rotate;

[0069] The first spline shaft 31 drives the first bushing 30 to rotate through a first spline groove. The first bevel gear on the first bushing 30 meshes with the first bevel gear on the coupling 29, thereby driving the coupling 29 to rotate. The coupling 29 is fixed at the tail of the grinding roller 9, and finally the rotation of the grinding roller 9 is realized;

[0070] The wire soft hairs evenly distributed on the grinding roller 9 polish the surface of the tower barrel 1 to remove the surface oxide layer and impurities, improving the bonding strength of welding;

[0071] After welding is completed, the two grinding rollers 9 polish the weld again;

[0072] A limit frame 14 is slidably installed on a driving frame 7. A set of ball bearings 15 are embedded on the side of the limit frame 14 facing the tower barrel 1. A pressing spring 16 is installed between the driving frame 7 and the limit frame 14. Two rubber pinch rollers 17 are rotatably installed on the driving frame 7. A second linkage module linked to the transmission bevel gear ring is installed at the tail of the driving frame 7;

[0073] The second linkage module includes a square shaft 32 rotatably connected to the driving frame 7. A square groove with both ends open and slidably connected to the square shaft 32 is fixedly opened inside one rubber pinch roller 17. The cross-sections of the square groove and the square shaft 32 are both regular hexagons. A second bushing 33 is rotatably installed on the driving frame 7. Second bevel gears are installed on both the second bushing 33 and the square shaft 32, and the two second bevel gears mesh with each other. A second spline shaft 34 is rotatably installed on the moving frame 3. The second bushing 33 is driven by the second spline shaft 34, and a second driven bevel gear meshing with the transmission bevel gear ring is fixedly installed at the tail end of the second spline shaft 34;

[0074] During the welding process, the second linkage module starts to work, the transmission bevel gear ring rotates to drive the second flower shaft 34 to rotate, the second flower shaft 34 drives the second shaft sleeve 33 to rotate through the second flower groove, the second bevel gear on the second shaft sleeve 33 and the second bevel gear on the square shaft 32 are meshed with each other, so that the square shaft 32 rotates, and the square shaft 32 is slidably connected with the square groove inside the rubber clamping roller 17, and the cross-sections of the square groove and the square shaft 32 are both regular hexagons, so that the rotation of the square shaft 32 drives the rubber clamping roller 17 to rotate;

[0075] After the rubber roller 17 rotates, it drives the tower 1 to rotate;

[0076] In the prior art, the tower 1 is prone to shaking during welding, which affects the welding quality;

[0077] This solution drives the rubber clamping roller 17 to rotate and provide a stable supporting force through the second linkage module, thereby solving the technical problem of the tower 1 shaking during welding, improving the stability of the tower 1 during welding, and thus improving the welding quality, which is a prominent beneficial effect compared with the prior art;

[0078] The first sleeve 30 has a first flower groove with openings at both ends fixedly formed inside and slidably connected to the first flower axis 31. The second sleeve 33 has a second flower groove with openings at both ends fixedly formed inside and slidably connected to the second flower axis 34. The cross-sections of the first flower axis 31, the second flower axis 34, the first flower groove and the second flower groove are all regular hexagons. The axes of the first flower axis 31 and the second flower axis 34 are both perpendicular to the axis of the tower 1.

[0079] A synchronous expansion mechanism, used for synchronously changing the positions of the full circle frame 5, the grinding frame 6 and the driving frame 7 on the moving frame 3;

[0080] The synchronous expansion mechanism includes a second bidirectional screw 25 rotatably connected to the gear cylinder 24, a second motor is installed on the moving frame 3, the output shaft end of the second motor is transmission-connected to the second bidirectional screw 25 through a second belt, the second bidirectional screw 25 is respectively provided with a second positive thread segment and a second negative thread segment, an expansion block 27 is transmission-mounted on the second positive thread segment and the second negative thread segment, and a connecting rod 28 is hinged between the driving frame 7 and the two expansion blocks 27, between the full-circle frame 5 and the two expansion blocks 27, and between the driving frame 7 and the two expansion blocks 27;

[0081] When the positions of the rounding frame 5, the grinding frame 6 and the driving frame 7 on the moving frame 3 need to be adjusted, the second motor is started;

[0082] The second motor drives the second bidirectional screw 25 to rotate through the second belt, and the second positive thread segment and the second negative thread segment on the second bidirectional screw 25 make the two expansion blocks 27 move along the screw direction;

[0083] Since the driving frame 7, the full-circle frame 5 and the expanding support block 27 are hinged by a connecting rod 28, the movement of the expanding support block 27 will push the full-circle frame 5, the grinding frame 6 and the driving frame 7 to slide synchronously on the moving frame 3, so as to adjust their positions to adapt to tower barrels 1 of different sizes.

[0084] After welding is completed, the position of the full-circle frame 5 is adjusted by the synchronous expanding mechanism to ensure that the full-circle rollers 8 are in close contact with the tower barrel 1.

[0085] A vibration monitoring mechanism is used for vibration pressure detection of the tower barrel 1 after welding.

[0086] The vibration monitoring mechanism includes a plurality of lifting push rods 35 installed on the moving frame 3 and a vibration frame 36 arranged directly above the tower barrel 1. The movable end of each lifting push rod 35 is fixedly connected to the vibration frame 36 through an elastic block 37. Two vibration pressure rollers 38 are rotatably installed on the inner wall of the vibration frame 36, and an excitation motor 39 is installed on the vibration frame 36.

[0087] After welding is completed, the lifting push rods 35 are started. The movable ends of the lifting push rods 35 push the vibration frame 36 to descend through the elastic blocks 37, so that the vibration pressure rollers 38 are in contact with the surface of the tower barrel 1. Then, the excitation motor 39 is started to drive the vibration pressure rollers 38 to apply vibration pressure to the tower barrel 1. During the vibration process, by detecting the vibration response of the tower barrel 1, the quality of the weld seam and whether there are defects inside can be judged. If there are defects in the weld seam, its vibration response will be different from that of a normal weld seam. In the prior art, the detection method for the quality of the weld seam after welding is relatively single and it is difficult to accurately detect internal defects.

[0088] In this solution, through the vibration monitoring mechanism, the tower barrel 1 after welding is detected by means of vibration pressure application, which can detect the quality of the weld seam more comprehensively and accurately, solves the technical problems of incomplete and inaccurate detection of the weld seam quality, discovers welding defects in time, and ensures the quality and safety of the tower barrel 1.

[0089] Treatment seams adapted to the tower barrel 1 are arranged between two rubber pinch rollers 17, between two grinding rollers 9 and between two full-circle rollers 8. Steel wire soft hairs are evenly distributed on the grinding rollers 9. The axes of the rubber pinch rollers 17, the grinding rollers 9 and the full-circle rollers 8 are all parallel to the tower barrel 1. A movable frame 40 is hinged on the bottom frame 18, and a retaining roller 41 for limiting the tower barrel 1 is rotatably installed on the movable frame 40. A positioning pin cooperating with the bottom frame 18 is arranged on the movable frame 40.

[0090] A pin hole cooperating with the positioning pin is fixedly arranged on the bottom frame 18. By pulling the positioning pin, the angle of the movable frame 40 relative to the bottom frame 18 is changed. During operation, the retaining roller 41 is arranged perpendicular to the horizontal plane to limit the tower barrel 1.

[0091] The processing seams provided between the two rubber pinch rollers 17, between the two grinding rollers 9, and between the two full-round rollers 8 and adapted to the tower barrel 1 can enable these rollers to better fit the surface of the tower barrel 1, improving the working effect;

[0092] The steel wire soft bristles evenly distributed on the grinding rollers 9 can more comprehensively grind the surface of the tower barrel 1 to remove impurities;

[0093] The axes of the rubber pinch rollers 17, the grinding rollers 9, and the full-round rollers 8 are all parallel to the tower barrel 1, ensuring uniform distribution of force during the working process and avoiding damage to the tower barrel 1.

[0094] In the prior art, the degree of fit between the rollers and the tower barrel 1 is not good, which will affect the grinding, support, and transmission effects. This solution solves the technical problem of poor fit between the rollers and the tower barrel 1 by reasonably setting the processing seams and relevant parameters of the rollers, improving the grinding, support, and transmission effects, and thus enhancing the working performance of the entire welding equipment;

[0095] The working principle of the present invention is:

[0096] The working process of the plasma welding equipment for the production of offshore wind power tower poles of the present invention is as follows: Before welding, start the first motor to drive the first bidirectional lead screw 21 to rotate, so that the electric heating roller 23 on the bracket 22 holds up the tower barrel 1 and uses the electric heating rod to control the temperature at 100 °C for preheating;

[0097] During welding, the servo motor 2 drives the transmission bevel gear ring, and then drives the tooth cylinder 24 and related components on the moving frame 3 to move. The moving frame 3 is displaced under the drive of the linear transmission module 4 to change the positions of the external welding torch 10 and the internal welding torch 11 for external butt welding and internal butt welding operations of the tower barrel 1. At the same time, the welding state can be switched by setting the rotation angle of the tower barrel 1;

[0098] Before welding, the grinding rollers 9 on the grinding frame 6 rotate under the drive of the first linkage module, and use the steel wire soft bristles to preliminarily grind the internal and external butt joints of the tower barrel 1 to prepare for welding;

[0099] The laser displacement sensor 12 and the visual acquisition probe 13 real-time monitor the distance between the welding components and the tower barrel 1 and the image information of the surface and weld seam of the tower barrel 1, and transmit it to the single-chip microcomputer 19. The single-chip microcomputer 19 controls the precise welding of the external welding torch 10 and the internal welding torch 11 accordingly;

[0100] After welding is completed, the electric heating rod works again to reheat the tower barrel 1 to eliminate residual stress;

[0101] After welding is completed, start the lifting push rod 35 to lower the vibration frame 36, so that the vibration pressing roller 38 contacts the surface of the tower barrel 1, and the excitation motor 39 drives the vibration pressing roller 38 to apply vibration pressure to the tower barrel 1, and judge the weld quality according to the vibration response;

[0102] In addition, the retaining roller 41 of the movable frame 40 on the chassis 18 can limit the wind turbine tower 1, and the processing gap between the rubber pinch roller 17, the grinding roller 9 and the circularity roller 8 enables it to better fit the surface of the wind turbine tower 1, improving the working effect.

[0103] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A plasma welding device for producing offshore wind power towers, comprising a tower (1), characterized in that: Also includes: A lifting mechanism, used for supporting the tower (1) and preheating the tower (1) before welding and reheating it after welding; The lifting mechanism comprises a first bidirectional screw (21) rotatably connected to a base frame (18), a first motor being mounted on the base frame (18), an output shaft end of the first motor being fixedly connected to the first bidirectional screw (21), a first positive thread segment and a first negative thread segment being respectively arranged on the first bidirectional screw (21), the first positive thread segment and the first negative thread segment being both rotatably mounted with a bracket (22), an inner wall of the bracket (22) being rotatably connected with an electric heating roller (23), the electric heating roller (23) being internally provided with an electric heating rod, the temperature range of the electric heating rod being 80°C-120°C The transmission bevel gear ring is driven by a servo motor (2); The movable frame (3) is driven by a linear transmission module (4), and a full-circle frame (5), a grinding frame (6) and two symmetrically arranged driving frames (7) are slidably mounted on the movable frame (3); Two round rollers (8) are rotatably mounted on the round frame (5), two grinding rollers (9) are rotatably mounted on the inner wall of the grinding frame (6), a first linkage module linked to the transmission bevel gear ring is mounted at the tail of the grinding frame (6), an external welding gun (10) is mounted on the round frame (5), an internal welding gun (11) is mounted on the grinding frame (6), and a laser displacement sensor (12) and a visual acquisition probe (13) are mounted on both the round frame (5) and the grinding frame (6); a limit frame (14) is slidably mounted on the driving frame (7), and the limit frame (14) and a group of balls (15) are embedded on one side opposite to the tower (1); a pressing spring (16) is installed between the driving frame (7) and the limiting frame (14); two rubber clamping rollers (17) are rotatably installed on the driving frame (7); a second linkage module linked to the transmission bevel gear ring is installed at the tail of the driving frame (7); a synchronous expansion mechanism is used to synchronously change the positions of the full circle frame (5), the grinding frame (6) and the driving frame (7) on the moving frame (3); and a vibration monitoring mechanism is used to detect the vibration pressure of the tower (1) after welding.

2. The plasma welding equipment for producing offshore wind power towers according to claim 1, characterized in that: The invention also comprises a base frame (18), on which a single chip computer (19) and a plasma welder (20) are mounted, the outer welding gun (10) and the inner welding gun (11) are connected to the plasma welder (20) via pipelines, the linear transmission module (4) is mounted on the base frame (18), the laser displacement sensor (12) and the visual acquisition probe (13) on the outer welding gun (10) and the full circle frame (5) are both arranged on the outside of the tower (1), and the laser displacement sensor (12) and the visual acquisition probe (13) on the inner welding gun (11) and the grinding frame (6) are both arranged on the inside of the tower (1).

3. The plasma welding equipment for producing offshore wind power towers according to claim 1, characterized in that: A gear cylinder (24) is rotatably mounted on the inner wall of the movable frame (3), the transmission bevel gear ring is fixedly mounted on the gear cylinder (24), and the output shaft end of the servo motor (2) is transmission-connected to the gear cylinder (24) via a first belt.

4. The plasma welding equipment for producing offshore wind power towers according to claim 1, characterized in that: The synchronous expansion mechanism comprises a second bidirectional screw (25) rotatably connected to the gear cylinder (24); a second motor is mounted on the movable frame (3); an output shaft end of the second motor is transmission-connected to the second bidirectional screw (25) via a second belt; a second positive thread segment and a second negative thread segment are respectively provided on the second bidirectional screw (25); an expansion block (27) is transmission-mounted on the second positive thread segment and the second negative thread segment; a connecting rod (28) is hingedly connected between the driving frame (7) and the two expansion blocks (27), between the full-circle frame (5) and the two expansion blocks (27), and between the driving frame (7) and the two expansion blocks (27).

5. The plasma welding equipment for producing offshore wind power towers according to claim 1, characterized in that: The first linkage module comprises a coupling shaft (29) fixedly mounted on the rear end of a grinding roller (9) and a first shaft sleeve (30) rotatably connected to the grinding frame (6); first bevel gears are mounted on both the first shaft sleeve (30) and the coupling shaft (29); the two first bevel gears are meshed with each other; a first flower shaft (31) is rotatably mounted on the moving frame (3); a first passive bevel gear meshed with a transmission bevel gear ring is fixedly mounted on the rear end of the first flower shaft (31); and the first shaft sleeve (30) is driven by the first flower shaft (31).

6. The plasma welding equipment for producing offshore wind power towers according to claim 5, characterized in that: The second linkage module comprises a square shaft (32) rotatably connected to the driving frame (7); a square groove with two ends opened and slidably connected to the square shaft (32) is fixedly provided inside the rubber clamping roller (17); the cross-sections of the square groove and the square shaft (32) are both regular hexagons; a second shaft sleeve (33) is rotatably mounted on the driving frame (7); a second bevel gear is mounted on the second shaft sleeve (33) and the square shaft (32); the two second bevel gears are meshed with each other; a second flower shaft (34) is rotatably mounted on the moving frame (3); the second shaft sleeve (33) is driven by the second flower shaft (34); a second passive bevel gear meshing with a transmission bevel gear ring is fixedly mounted at the tail end of the second flower shaft (34).

7. The plasma welding equipment for producing offshore wind power towers according to claim 6, characterized in that: A first flower groove with openings at both ends and slidably connected to the first flower shaft (31) is fixedly provided inside the first shaft sleeve (30), and a second flower groove with openings at both ends and slidably connected to the second flower shaft (34) is fixedly provided inside the second shaft sleeve (33), wherein the cross-sections of the first flower shaft (31), the second flower shaft (34), the first flower groove and the second flower groove are all regular hexagons, and the axes of the first flower shaft (31) and the second flower shaft (34) are both perpendicular to the axis of the tower (1).

8. The plasma welding equipment for producing offshore wind power towers according to claim 1, characterized in that: The vibration monitoring mechanism comprises a plurality of lifting push rods (35) mounted on a movable frame (3) and a vibration frame (36) arranged directly above the tower (1); the movable end of each lifting push rod (35) is fixedly connected to the vibration frame (36) via an elastic block (37); two vibration rollers (38) are rotatably mounted on the inner wall of the vibration frame (36); and an exciting motor (39) is mounted on the vibration frame (36).

9. The plasma welding equipment for producing offshore wind power towers according to claim 2, characterized in that: A processing gap adapted to the tower (1) is provided between the two rubber clamping rollers (17), between the two grinding rollers (9) and between the two rounding rollers (8); the grinding rollers (9) are evenly covered with soft steel wire hairs; the axes of the rubber clamping rollers (17), the grinding rollers (9) and the rounding rollers (8) are parallel to the tower (1); a movable frame (40) is hingedly connected to the base frame (18); a stop roller (41) for limiting the position of the tower (1) is rotatably mounted on the movable frame (40); and a positioning pin cooperating with the base frame (18) is provided on the movable frame (40).

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