A welding device and welding method for steel structure of building construction

Abstract

The present invention belongs to the technical field of welding devices, and in particular relates to a welding device and method for steel structures used in construction, comprising a base, a clamping and rotating mechanism fixedly mounted on one side of the upper end of the base, two sections of welded steel pipes fixedly clamped in the clamping and rotating mechanism, an intermediate supporting mechanism fixedly mounted on the upper end of the base and connected to the lower end of the welded steel pipe, and a steel pipe outer wall cleaning mechanism fixedly mounted on the intermediate supporting mechanism. The present invention can effectively clean the weld joint of the welded steel pipe, ensure that the surface of the steel structure material in the welding area is clean, and remove possible impurities such as rust and oxides, thereby ensuring the quality of subsequent welding, so that subsequent defect detection and welding work can change with the position of the weld, thereby ensuring the quality of detection and welding, without the need for complex precision programming welding equipment, and having a wider applicability.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding devices, and in particular relates to a welding device and a welding method for a steel structure in construction. Background Art

[0002] In construction, it is often necessary to perform steel pipe welding operations according to on-site construction requirements to meet different construction and use needs.

[0003] The following problems are encountered in the current reagent welding of steel pipes:

[0004] 1. In order to ensure the welding quality of steel pipes, the welding ends of steel pipes are often made into lace-shaped structures. The lace-shaped structure can increase the area of ​​the weld, enhance the strength and rigidity of the weld, and disperse the stress and load on the weld to a larger area, reducing the concentrated stress of the weld and improving the load-bearing capacity of the weld. However, this setting method also requires the position of the welding head to be constantly changed during welding to meet welding requirements. However, welding equipment that can be programmed is expensive and not all construction parties can use it. Most of the time, manual welding is still used, which not only has low welding efficiency but also is prone to errors, resulting in welding quality that does not meet actual needs.

[0005] 2. Welding temperature and speed have a direct impact on the strength of the welded joint. Especially when there are defects and holes at the welded joint of the steel pipe, it is necessary to increase the welding temperature and reduce the welding speed. Increasing the welding temperature can improve the fluidity and wettability of the weld, which helps to fill defects and holes. Slowing down the welding speed can provide more time to fill defects and holes and ensure that the weld entity is fully melted. However, the welding of steel pipes cannot be adaptively adjusted according to this characteristic. It still needs to be visually inspected and adjusted by experienced masters. It is time-consuming and labor-intensive. Moreover, it obviously cannot keep up with the processing progress for large-scale steel pipe welding work and cannot meet the actual welding needs well.

[0006] Therefore, we propose a welding device and a welding method for building construction steel structures to solve the above problems. Summary of the Invention

[0007] The object of the present invention is to provide a welding device and a welding method for steel structures in construction in order to solve the above problems.

[0008] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a welding device for steel structures for construction, comprising a base, wherein one side of the upper end of the base is fixedly provided with a clamping and rotating mechanism, and two sections of welding steel pipes are fixedly clamped in the clamping and rotating mechanism, and the upper end of the base is also fixedly provided with an intermediate supporting mechanism connected to the lower end of the welding steel pipe, and the intermediate supporting mechanism is also fixedly provided with a steel pipe outer wall cleaning mechanism, and the other side of the upper end of the base is fixedly provided with a weld line memory mechanism, and the rear side of the upper end of the base is also fixedly provided with an L-shaped vertical plate, the lower end of the horizontal part of the L-shaped vertical plate is slidably connected to a linkage rod, the lower side of one end of the linkage rod is fixedly connected to an identification and detection welding mechanism, and the lower side of the other end of the linkage rod is connected to the weld line memory mechanism, and a PLC controller and a welding temperature and speed control mechanism are fixedly provided on the upper end of the L-shaped vertical plate, and the clamping and rotating mechanism, the steel pipe outer wall cleaning mechanism, the weld line memory mechanism, the identification and detection welding mechanism and the welding temperature and speed control mechanism are all electrically connected to the PLC controller.

[0009] In the above-mentioned welding device for steel structure construction, the clamping and rotating mechanism includes two side plates symmetrically fixedly connected to the upper end of the base, and the upper end of the base is also fixedly installed with a clamping dual-axis motor located between the two side plates, and the output ends of both ends of the clamping dual-axis motor are fixedly connected to an adjusting screw, one end of the adjusting screw is rotatably connected to the side wall of the side plate through a bearing, and the rod wall of the adjusting screw is also threadedly sleeved with a support plate, and multiple guide rods are fixedly connected between the two side plates, and the side wall of the support plate is provided with a guide hole slidably sleeved with the guide rod, and the upper end side wall of the support plate is provided with a through hole, and a rotating shaft is rotatably sleeved in the corresponding through hole through a bearing, one end of the rotating shaft extends into the welded steel pipe and is fixedly connected to a support block, and the outer wall of the support block is fixedly connected to multiple micro electric push rods, and the output ends of multiple micro electric push rods on the same side are fixedly connected to the same rubber support plate, and the outer wall of one of the support plates is fixedly installed with a rotating motor, and the output end of the rotating motor is fixedly connected to one end of the rotating shaft.

[0010] In the above-mentioned welding device for steel structures in construction, the intermediate supporting mechanism includes two arc-shaped supporting plates symmetrically supported on the outer side of the lower end of the welded steel pipe, and multiple support columns are fixedly connected between the lower end of the arc-shaped supporting plate and the upper end of the base. The inner wall of the arc-shaped supporting plate is evenly provided with multiple ball grooves, and universal balls are fixedly installed in the corresponding ball grooves through a ball installation mechanism.

[0011] In the above-mentioned welding device for steel structure construction, the steel pipe outer wall cleaning mechanism includes a U-shaped positioning plate fixedly connected between two arc-shaped supporting plates, the horizontal part of the U-shaped positioning plate is provided with a plurality of through holes, and a push rod is movably inserted in the corresponding through holes, and the upper ends of the plurality of push rods are fixedly connected to the same lifting plate, the surface of the lifting plate is evenly provided with a plurality of through holes, and a transmission shaft is rotatably sleeved in the corresponding through holes through a bearing, the upper end of the transmission shaft is fixedly connected to a cleaning brush disc, and the lower end of the lifting plate is symmetrical There are two bearing seats fixedly connected, and the same wheel axle is rotatably connected in the two bearing seats through bearings. Both ends of the wheel axle are fixedly connected to driving rollers, and the wheel axle and the transmission shaft are connected through a bevel gear assembly. The lower ends of multiple push rods are fixedly connected to the same push plate, the lower end of the U-shaped positioning plate is fixedly connected to an attraction electromagnetic plate, and the upper end of the push plate is fixedly connected to an attraction permanent magnet plate. The lower end of the U-shaped positioning plate and the upper end of the push plate are fixedly connected to multiple downward pressure springs sleeved on the outside of the push rod.

[0012] In the above-mentioned welding device for steel structures in construction, the weld line memory mechanism includes a mounting bracket fixedly connected to the upper end of the base, the inner side of the upper end of the mounting bracket is rotatably connected to a synchronous roller, the upper end of the base is fixedly provided with a DC dual-axis motor located in the mounting bracket, the output ends of the DC dual-axis motor and the two ends of the synchronous roller are connected by a pulley drive assembly, the outer wall of the synchronous roller is symmetrically slidably connected to a plurality of force rods, the inner wall of the synchronous roller is slidably connected to a plurality of connecting rods corresponding to the positions of the force rods, and the rod walls on the opposite sides of the force rods and the connecting rods are fixedly embedded with synchronous racks, The outer wall of the synchronous drum is provided with a plurality of rectangular openings located between the force-bearing rod and the connecting rod, and a synchronous gear meshing with the synchronous rack is rotatably connected in the corresponding rectangular openings. The inner and outer walls of the synchronous drum are fixedly connected with a plurality of guide cylinders slidably sleeved outside the force-bearing rod and the connecting rod. A fixed electromagnetic block is fixedly embedded in the guide cylinder, and a fixed permanent magnet block is fixedly embedded in the rod walls of the force-bearing rod and the connecting rod. One end of multiple force-bearing rods on the same side is fixedly connected to the same flexible side strip, and the lower side of one end of the linkage rod is fixedly connected to a vertical rod, and the lower end of the vertical rod is fixedly connected to a push-pull ball located between the two flexible side strips.

[0013] In the above-mentioned welding device for steel structures for construction, the identification and detection welding mechanism includes a fixed plate fixedly connected to the lower side of one end of the linkage rod, a steering motor is fixedly installed on the lower side wall of the fixed plate, the output end of the steering motor extends through the fixed plate and is fixedly connected to a mounting block, a weld follow-up rod is fixedly installed on the lower end of the mounting block, and a motor rotating assembly is also fixedly installed on the upper end of the mounting block, the upper output end of the motor rotating assembly is fixedly connected to a horizontal plate, and the two ends of the horizontal plate are respectively fixedly connected to an ultrasonic detection probe and an arc welding head.

[0014] In the above-mentioned welding device for steel structures in construction, the welding temperature and speed control mechanism includes an insulating shell, and the upper and lower inner walls of the opposite sides of the insulating shell are respectively fixedly connected with an arc welding resistance rod and a motor resistance rod, and one side wall of the insulating shell is fixedly sleeved with an adjusting electric push rod, and the output end of the adjusting electric push rod is fixedly connected with an insulating block, and the upper and lower ends of the insulating block are respectively fixedly connected with an arc welding conductive contact and a motor conductive contact, the arc welding resistance rod and the arc welding conductive contact are electrically connected to the power supply circuit of the welding mechanism at the rear end of the arc welding head, and the motor conductive contact and the motor resistance rod are electrically connected to the power supply circuit of the DC dual-axis motor.

[0015] A welding method for a steel structure welding device for building construction, comprising the following steps:

[0016] S1. First, two sections of welded steel pipe are placed on the outside of multiple rubber support plates. The PLC controller controls the movement of the micro-electric actuator, which pushes the rubber support plates to move, quickly and stably securing the welded steel pipe. The clamping dual-axis motor is then activated, which drives the adjustment screw to rotate. The threaded connection between the adjustment screw and the support plate brings the two sections of welded steel pipe closer together, ensuring stable and accurate contact between the two sections.

[0017] S2. The steering motor drives the mounting block to rotate, so that the weld following rod rotates to the lower side and extends into the weld between the two sections of welded steel pipes. The rotating motor is started, and the rotating motor drives the two sections of welded steel pipes to rotate. The DC dual-axis motor is synchronously controlled by the PLC controller to move synchronously. As the two sections of welded steel pipes rotate, the weld following rod moves in the weld, thereby driving the weld following rod to continuously move in the horizontal position to identify the specific position of the weld. The weld following rod drives the vertical rod and the push-pull ball to continuously move in the horizontal position along with the weld through the mounting block, the fixed plate, and the linkage rod. The DC dual-axis motor drives the synchronous drum to rotate through the pulley drive assembly. The lateral displacement of the push-pull ball cooperates with the rotation of the synchronous drum, so that the push-pull ball squeezes on the flexible edge strip, thereby pushing different positions. The stressed rod moves left and right as the weld position changes. The movement of the stressed rod on one side drives the stressed rod on the other side through the synchronous rack and synchronous gear driving connecting rod, so that the distance between the two stressed rods remains constant, and then the position change of the weld between the two sections of welded steel pipes is simulated between the two flexible side strips. The outer diameter of the welded steel pipe here is the same as the outer diameter of the synchronous drum, so the weld change of the welded steel pipe can be completely presented on the outside of the synchronous drum. After rotating one circle, the rotating motor and the DC dual-axis motor stop synchronously to complete the memory fixation of the weld route. At this time, the PLC controller supplies power to the fixed electromagnetic block, and the fixed electromagnetic block cooperates with the fixed permanent magnet block to make the guide cylinder fix the stressed rod and the connecting rod, so as to realize the memory fixation of the weld route.

[0018] S3. When memorizing the route of the weld, power is simultaneously supplied to the suction electromagnetic plate. The suction electromagnetic plate is energized to generate magnetism, which cooperates with the suction permanent magnet plate to drive the push plate to overcome the elastic force of the downward pressure spring and move upward, thereby causing the driving roller and the cleaning brush plate to contact the lower ends of the two sections of welded steel pipes. As the welded steel pipes rotate, the cleaning brush plate and the welded steel pipes move relative to each other to quickly clean the outer wall of the welded steel pipes. The driving roller rotates accordingly, driving the wheel shaft to rotate. The wheel shaft drives multiple transmission shafts to rotate synchronously through the bevel gear assembly. The transmission shaft drives the cleaning brush plate to further rotate, thereby further grinding and cleaning the outer wall of the weld seam of the welded steel pipes.

[0019] S4. The mounting block is then rotated 180 degrees by the steering motor, and the cross plate is driven to rotate by the motor rotation assembly, so that the ultrasonic detection probe moves to the upper end of the welded steel pipe. The PLC controller starts the rotating motor and the DC dual-axis motor. Since the outer surface of the synchronous drum uses two flexible edge strips to fix the weld route, the push-pull ball is squeezed and pushed by the two flexible edge strips and the force rod to drive the linkage rod to move laterally, and then the position change of the weld is fed back to the ultrasonic detection probe, so that the ultrasonic detection probe always keeps synchronized with the position change of the weld of the welded steel pipe. When the ultrasonic wave propagates to discontinuities such as defects or holes in the material, part of the sound energy will be reflected due to the discontinuity of the medium. The amplitude and waveform of the reflection depend on factors such as the shape, size, position and material properties of the defect or hole, so that the ultrasonic detection probe can accurately detect defects and holes in the weld and feed back the detected defects to the PLC controller. The PLC controller adjusts the action of the electric push rod according to the number of defects and holes. Specifically, the more defects and holes there are, the longer the movement distance of the output end of the electric push rod is adjusted;

[0020] S5. Then drive the horizontal plate to rotate 180 degrees through the motor rotation assembly, so that the arc welding head moves to the upper end of the weld, start the rotating motor and the DC dual-axis motor, so that the arc welding head changes synchronously with the position of the weld, and performs stable welding operations. During welding, the arc welding conductive contact and the motor conductive contact are driven by the adjusting electric push rod through the insulating block to move on the arc welding resistance rod and the motor resistance rod respectively, so that the resistance of the arc welding resistance rod connected to the power supply circuit of the welding mechanism at the rear end of the arc welding head is reduced, thereby increasing the power supply current, thereby controlling the energy and heat input of the welding arc, thereby increasing the welding temperature, and the resistance of the motor resistance rod connected to the power supply circuit of the DC dual-axis motor is increased, thereby reducing the power supply current, reducing the power speed of the DC dual-axis motor, slowing down the welding speed, and realizing adaptive adjustment of the welding temperature and speed based on defects and hole formation at the welding end of the welded steel pipe.

[0021] Compared with the existing technology, the beneficial effects of the present invention are:

[0022] 1. Through the provided base, clamping and rotating mechanism, intermediate supporting mechanism and welded steel pipe, the two sections of welded steel pipe can be clamped and fixed quickly and accurately, and the welding ends of the two sections of welded steel pipe can be kept in the middle position, which is convenient for subsequent welding operations.

[0023] 2. The outer wall cleaning mechanism of the steel pipe can effectively clean the welding joint of the welded steel pipe, ensure the surface of the steel structure material in the welding area is clean, and remove possible impurities such as rust and oxides to ensure the subsequent welding quality.

[0024] 3. Through the set weld line memory mechanism and identification and detection welding mechanism, the weld curve changes at the welded end of the welded steel pipe can be automatically detected, and the weld curve changes can be memorized and fixed, so that subsequent defect detection and welding work can change with the position of the weld, ensuring the quality of detection and welding. It does not require complex precision programming welding equipment, has a wider applicability and lower use cost.

[0025] 4. Through the set identification and detection welding mechanism, welding temperature and speed control mechanism, and PLC controller, the welding temperature and speed can be adaptively adjusted according to the defects at the welding end of the welded steel pipe, effectively overcoming the problem of defect position affecting welding quality and improving welding quality.

[0026] In summary: the present invention can effectively clean the welding joint of the welded steel pipe, ensure that the surface of the steel structure material in the welding area is clean, and remove possible impurities such as rust and oxides, thereby ensuring the subsequent welding quality, so that subsequent defect detection and welding work can change accordingly with the position of the weld, thereby ensuring the quality of detection and welding, without the need for complex precision programming welding equipment, with wider applicability and lower use cost, effectively overcoming the problem of defect position affecting welding quality, and improving welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural schematic diagram of a steel structure welding device for construction provided by the present invention;

[0028] Figure 2 This is a schematic cross-sectional view of a clamping and rotating mechanism of a welding device for a steel structure in construction provided by the present invention;

[0029] Figure 3 This is a structural schematic diagram of an intermediate supporting mechanism of a steel structure welding device for construction provided by the present invention;

[0030] Figure 4 This is a structural schematic diagram of a steel pipe outer wall cleaning mechanism of a steel structure welding device for construction provided by the present invention;

[0031] Figure 5 This is a partially enlarged structural diagram of a weld line memory mechanism of a steel structure welding device for construction provided by the present invention;

[0032] Figure 6 This is a structural schematic diagram of an identification and detection welding mechanism of a steel structure welding device for construction provided by the present invention;

[0033] Figure 7 The present invention provides a cross-sectional structural diagram of a welding temperature and speed control mechanism of a steel structure welding device for construction.

[0034] In the figure: 1 base, 2 clamping rotation mechanism, 21 side plate, 22 clamping dual-axis motor, 23 adjusting screw, 24 support plate, 25 guide rod, 26 rotating shaft, 27 support block, 28 micro electric push rod, 29 rubber support plate, 210 rotating motor, 3 intermediate support mechanism, 31 arc support plate, 32 support column, 33 universal ball, 4 steel pipe outer wall cleaning mechanism, 41 U-shaped positioning plate, 42 push rod, 43 lifting plate, 44 transmission shaft, 45 cleaning brush plate, 46 bearing seat, 47 wheel axle, 48 driving roller, 49 bevel gear assembly, 410 push plate, 411 suction electromagnetic plate, 412 suction permanent magnet plate, 413 downward pressure spring, 5 weld line memory mechanism, 51 mounting bracket, 52 synchronous roller, 53 DC dual-axis motor , 54 pulley drive assembly, 55 force rod, 56 connecting rod, 57 synchronous rack, 58 synchronous gear, 59 guide cylinder, 510 fixed electromagnetic block, 511 fixed permanent magnet block, 512 flexible edge strip, 513 vertical pole, 514 push-pull ball, 6 identification and detection welding mechanism, 61 fixed plate, 62 steering motor, 63 mounting block, 64 weld following rod, 65 motor rotation assembly, 66 cross plate, 67 ultrasonic detection probe, 68 arc welding head, 7 welding temperature and speed control mechanism, 71 insulating shell, 72 arc welding resistance rod, 73 motor resistance rod, 74 adjusting electric push rod, 75 insulating block, 76 arc welding conductive contact, 77 motor conductive contact, 8 welding steel pipe, 9 L-shaped vertical plate, 10 linkage rod, 11PLC controller. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] like Figure 1-Figure 7As shown, a welding device for steel structures for construction includes a base 1, a clamping and rotating mechanism 2 is fixedly installed on one side of the upper end of the base 1, and the clamping and rotating mechanism 2 includes two side plates 21 symmetrically fixedly connected to the upper end of the base 1. The upper end of the base 1 is also fixedly installed with a clamping dual-axis motor 22 located between the two side plates 21. The output ends of the clamping dual-axis motor 22 are fixedly connected to an adjusting screw 23 at both ends. One end of the adjusting screw 23 is rotatably connected to the side wall of the side plate 21 through a bearing. The rod wall of the adjusting screw 23 is also threadedly sleeved with a support plate 24. A plurality of guide rods 2 are also fixedly connected between the two side plates 21. 5. The side wall of the support plate 24 is provided with a guide hole that is slidably sleeved with the guide rod 25. The upper end side wall of the support plate 24 is provided with a through hole, and a rotating shaft 26 is rotatably sleeved in the corresponding through hole through a bearing. One end of the rotating shaft 26 extends into the welded steel pipe 8 and is fixedly connected to a support block 27. The outer wall of the support block 27 is fixedly connected to a plurality of micro electric push rods 28. The output ends of the plurality of micro electric push rods 28 on the same side are fixedly connected to the same rubber support plate 29. A rotating motor 210 is fixedly installed on the outer wall of one of the support plates 24, and the output end of the rotating motor 210 is fixedly connected to one end of the rotating shaft 26.

[0037] The clamping and rotating mechanism 2 is fixed with two sections of welded steel pipes 8. The upper end of the base 1 is also fixedly provided with an intermediate supporting mechanism 3 that is supported on the lower end of the welded steel pipe 8. The intermediate supporting mechanism 3 includes two arc-shaped supporting plates 31 that are symmetrically supported on the outer side of the lower end of the welded steel pipe 8. A plurality of support columns 32 are fixedly connected between the lower end of the arc-shaped supporting plate 31 and the upper end of the base 1. A plurality of ball grooves are evenly opened on the inner wall of the arc-shaped supporting plate 31, and universal balls 33 are fixedly installed in the corresponding ball grooves through a ball mounting mechanism.

[0038] A steel pipe outer wall cleaning mechanism 4 is also fixedly installed on the intermediate supporting mechanism 3. The steel pipe outer wall cleaning mechanism 4 includes a U-shaped positioning plate 41 fixedly connected between the two arc-shaped supporting plates 31. The horizontal portion of the U-shaped positioning plate 41 is provided with a plurality of through holes, and a push rod 42 is movably inserted into the corresponding through holes. The upper ends of the plurality of push rods 42 are fixedly connected to the same lifting plate 43. The surface of the lifting plate 43 is evenly provided with a plurality of through holes, and a transmission shaft 44 is rotatably sleeved in the corresponding through holes through a bearing. The upper end of the transmission shaft 44 is fixedly connected to a cleaning brush disc 45, and the lower end of the lifting plate 43 is symmetrically fixedly connected to two There are two bearing seats 46, and the same wheel axle 47 is rotatably connected in the two bearing seats 46 through bearings. Both ends of the wheel axle 47 are fixedly connected to the driving rollers 48. The wheel axle 47 and the transmission shaft 44 are connected by a bevel gear assembly 49. The lower ends of multiple push rods 42 are fixedly connected to the same push plate 410, the lower end of the U-shaped positioning plate 41 is fixedly connected to the attraction electromagnetic plate 411, and the upper end of the push plate 410 is fixedly connected to the attraction permanent magnet plate 412. The lower end of the U-shaped positioning plate 41 and the upper end of the push plate 410 are fixedly connected to multiple downward pressure springs 413 sleeved on the outside of the push rod 42.

[0039] A weld line memory mechanism 5 is fixedly installed on the other side of the upper end of the base 1. The weld line memory mechanism 5 includes a mounting bracket 51 fixedly connected to the upper end of the base 1. The inner side of the upper end of the mounting bracket 51 is rotatably connected to a synchronous drum 52. A DC dual-axis motor 53 located in the mounting bracket 51 is fixedly installed on the upper end of the base 1. The output ends of the DC dual-axis motor 53 and the two ends of the synchronous drum 52 are connected by a pulley drive assembly 54. The outer wall of the synchronous drum 52 is symmetrically slidably connected to a plurality of force rods 55. The inner wall of the synchronous drum 52 is slidably connected to a plurality of connecting rods 56 corresponding to the positions of the force rods 55. The force rods 55 and the connecting rods 56 are fixedly embedded with synchronous racks 57 on the rod walls on the opposite sides. The outer wall of 52 is provided with a plurality of rectangular openings located between the force-bearing rod 55 and the connecting rod 56, and a synchronous gear 58 meshing with the synchronous rack 57 is rotatably connected in the corresponding rectangular opening. The inner and outer walls of the synchronous roller 52 are fixedly connected with a plurality of guide cylinders 59 slidingly sleeved outside the force-bearing rod 55 and the connecting rod 56. A fixed electromagnetic block 510 is fixedly embedded in the guide cylinder 59, and a fixed permanent magnet block 511 is fixedly embedded in the rod wall of the force-bearing rod 55 and the connecting rod 56. One end of multiple force-bearing rods 55 on the same side is fixedly connected to the same flexible side strip 512, and the lower side of one end of the linkage rod 10 is fixedly connected to a vertical rod 513, and the lower end of the vertical rod 513 is fixedly connected to a push-pull ball 514 located between the two flexible side strips 512.

[0040] An L-shaped vertical plate 9 is also fixedly installed on the rear side of the upper end of the base 1, and the lower end of the horizontal part of the L-shaped vertical plate 9 is slidably connected to a linkage rod 10. The lower side of one end of the linkage rod 10 is fixedly connected to an identification and detection welding mechanism 6. The identification and detection welding mechanism 6 includes a fixed plate 61 fixedly connected to the lower side of one end of the linkage rod 10, and a steering motor 62 is fixedly installed on the lower side wall of the fixed plate 61. The output end of the steering motor 62 extends through the fixed plate 61 and is fixedly connected to a mounting block 63. A weld follow-up rod 64 is fixedly installed on the lower end of the mounting block 63, and a motor rotating assembly 65 is also fixedly installed on the upper end of the mounting block 63. The upper output end of the motor rotating assembly 65 is fixedly connected to a horizontal plate 66, and the two ends of the horizontal plate 66 are respectively fixedly connected to an ultrasonic detection probe 67 and an arc welding head 68.

[0041] The lower side of the other end of the linkage rod 10 is connected to the weld line memory mechanism 5, and the upper end of the L-shaped vertical plate 9 is fixedly installed with a PLC controller 11 and a welding temperature speed control mechanism 7. The welding temperature speed control mechanism 7 includes an insulating shell 71, and the upper and lower opposite inner walls of the insulating shell 71 are respectively fixedly connected with an arc welding resistance rod 72 and a motor resistance rod 73. One side wall of the insulating shell 71 is fixedly inserted with an adjusting electric push rod 74, and the output end of the adjusting electric push rod 74 is fixedly connected with an insulating block 75. The upper and lower ends of the insulating block 75 are respectively fixedly connected with an arc welding conductive contact 76 and a motor conductive contact 77. The arc welding resistance rod 72 and the arc welding conductive contact 76 are electrically connected to the power supply circuit of the welding mechanism at the rear end of the arc welding head 68, and the motor conductive contact 77 and the motor resistance rod 73 are electrically connected to the power supply circuit of the DC dual-axis motor 53.

[0042] The clamping and rotating mechanism 2 , the steel pipe outer wall cleaning mechanism 4 , the weld line memory mechanism 5 , the identification and detection welding mechanism 6 and the welding temperature and speed control mechanism 7 are all electrically connected to the PLC controller 11 .

[0043] The operating principle of the present invention is described as follows: first, two sections of welded steel pipe 8 are placed on the outside of a plurality of rubber support plates 29, respectively. The PLC controller 11 controls the movement of the micro electric push rod 28, which pushes the rubber support plate 29 to move, thereby quickly and stably fixing the welded steel pipe 8. Then, the clamping dual-axis motor 22 is started, and the clamping dual-axis motor 22 drives the adjusting screw 23 to rotate. The threaded connection between the adjusting screw 23 and the support plate 24 brings the two sections of welded steel pipe 8 closer to each other, so that the two sections of welded steel pipe 8 are in stable and accurate contact with each other.

[0044] The steering motor 62 drives the mounting block 63 to rotate, so that the weld following rod 64 rotates to the lower side and extends into the weld between the two sections of welded steel pipes 8, and starts the rotating motor 210. The rotating motor 210 drives the two sections of welded steel pipes 8 to rotate, and the DC dual-axis motor 53 is synchronously controlled by the PLC controller 11 to move synchronously. As the two sections of welded steel pipes 8 rotate, the weld following rod 64 moves in the weld, thereby driving the weld following rod 64 to continuously move in the horizontal position to identify the specific position of the weld. The weld following rod 64 drives the vertical rod 513 and the push-pull ball 514 in the horizontal position continuously along with the weld through the mounting block 63, the fixed plate 61, and the linkage rod 10. The DC dual-axis motor 53 drives the synchronous drum 52 to rotate through the pulley drive assembly 54. The lateral displacement of the push-pull ball 514 cooperates with the rotation of the synchronous drum 52, so that the push-pull ball 514 is squeezed and pushed on the flexible edge strip 512, thereby pushing the The stressed rods 55 at the same position move left and right as the weld position changes. The movement of the stressed rod 55 on one side drives the connecting rod 56 to drive the stressed rod 55 on the other side to move through the synchronous rack 57 and the synchronous gear 58, so that the distance between the two stressed rods 55 remains constant, and then the position change of the weld between the two sections of welded steel pipes 8 is simulated between the two flexible edge strips 512. The outer diameter of the welded steel pipe 8 here is the same as the outer diameter of the synchronous drum 52, so the weld change of the welded steel pipe 8 can be completely presented on the outside of the synchronous drum 52. After rotating one circle, the rotating motor 210 and the DC dual-axis motor 53 stop moving synchronously to complete the memory fixation of the weld route. At this time, the PLC controller 11 supplies power to the fixed electromagnetic block 510, and the fixed electromagnetic block 510 cooperates with the fixed permanent magnet block 511 to enable the guide cylinder 59 to fix the stressed rod 55 and the connecting rod 56, thereby realizing the memory fixation of the weld route.

[0045] When the route of the weld is memorized, power is supplied to the suction electromagnetic plate 411 synchronously. The suction electromagnetic plate 411 is energized to generate magnetism, and the suction permanent magnet plate 412 drives the push plate 410 to overcome the elastic force of the downward pressure spring 413 and move upward, thereby causing the driving roller 48 and the cleaning brush plate 45 to contact the lower ends of the two sections of welded steel pipe 8. As the welded steel pipe 8 rotates, the cleaning brush plate 45 and the welded steel pipe 8 move relative to each other to achieve rapid cleaning of the outer wall of the welded steel pipe 8, and the driving roller 48 rotates accordingly to drive the wheel shaft 47 to rotate. The wheel shaft 47 drives multiple transmission shafts 44 to rotate synchronously through the bevel gear assembly 49, and the transmission shaft 44 drives the cleaning brush plate 45 to further rotate, thereby achieving further grinding and cleaning of the outer wall of the weld seam of the welded steel pipe 8;

[0046] Then, the steering motor 62 drives the mounting block 63 to rotate 180 degrees, and the motor rotating assembly 65 drives the cross plate 66 to rotate, so that the ultrasonic detection probe 67 moves to the upper end of the welded steel pipe 8. The PLC controller 11 starts the rotating motor 210 and the DC dual-axis motor 53. Since the outer surface of the synchronous roller 52 uses two flexible side strips 512 to fix the route of the weld, the push-pull ball 514 is pushed by the two flexible side strips 512 and the force rod 55 to drive the linkage rod 10 to move horizontally, and then the position of the weld is changed and fed back to the ultrasonic detection probe 67, so that the ultrasonic detection probe 67 is always in contact with the weld of the welded steel pipe 8. The transformation of the seam position keeps the position change synchronously. When the ultrasonic wave propagates to the discontinuity such as defects or holes in the material, part of the sound energy will be reflected due to the discontinuity of the medium. The amplitude and waveform of the reflection depend on factors such as the shape, size, position and material properties of the defect or hole, so that the ultrasonic detection probe 67 can accurately detect the defects and holes in the weld and feed back the detected defects to the PLC controller 11. The PLC controller 11 adjusts the movement of the electric push rod 74 according to the number of defects and holes. Specifically, the more defects and holes there are, the longer the moving distance of the output end of the electric push rod 74 is adjusted.

[0047] Then, the motor rotation assembly 65 drives the cross plate 66 to rotate 180 degrees, so that the arc welding head 68 moves to the upper end of the weld, and the rotating motor 210 and the DC dual-axis motor 53 are started, so that the arc welding head 68 changes synchronously with the position of the weld, and a stable welding operation is performed. During welding, the electric push rod 74 is adjusted to drive the arc welding conductive contact 76 and the motor conductive contact 77 to move on the arc welding resistor rod 72 and the motor resistor rod 73 respectively through the insulating block 75, so that the resistance of the power supply circuit of the arc welding resistor rod 72 connected to the rear end welding mechanism of the arc welding head 68 is reduced, thereby increasing the power supply current, thereby controlling the energy and heat input of the welding arc, thereby increasing the welding temperature, and the resistance of the power supply circuit of the motor resistor rod 73 connected to the DC dual-axis motor 53 is increased, thereby reducing the power supply current, reducing the power speed of the DC dual-axis motor 53, slowing down the welding speed, and realizing adaptive adjustment of the welding temperature and speed based on the defects and hole formation at the welding end of the welded steel pipe 8.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A welding device for steel structures for building construction, comprising a base (1), characterized in that: A clamping rotation mechanism (2) is fixedly installed on one side of the upper end of the base (1), and two sections of welded steel pipes (8) are fixedly clamped in the clamping rotation mechanism (2). An intermediate supporting mechanism (3) connected to the lower end of the welded steel pipe (8) is also fixedly installed on the upper end of the base (1), and a steel pipe outer wall cleaning mechanism (4) is also fixedly installed on the intermediate supporting mechanism (3). A weld line memory mechanism (5) is fixedly installed on the other side of the upper end of the base (1). An L-shaped vertical plate (9) is also fixedly installed on the rear side of the upper end of the base (1), and the lower horizontal portion of the L-shaped vertical plate (9) is fixedly mounted. The end is slidably connected to a linkage rod (10), the lower side of one end of the linkage rod (10) is fixedly connected to an identification and detection welding mechanism (6), the lower side of the other end of the linkage rod (10) is connected to a weld line memory mechanism (5), the upper end of the L-shaped vertical plate (9) is fixedly provided with a PLC controller (11) and a welding temperature and speed control mechanism (7), and the clamping and rotating mechanism (2), the steel pipe outer wall cleaning mechanism (4), the weld line memory mechanism (5), the identification and detection welding mechanism (6) and the welding temperature and speed control mechanism (7) are all electrically connected to the PLC controller (11); The weld line memory mechanism (5) comprises a mounting bracket (51) fixedly connected to the upper end of the base (1); the inner side of the upper end of the mounting bracket (51) is rotatably connected to a synchronous roller (52); the upper end of the base (1) is fixedly provided with a DC double-axis motor (53) located in the mounting bracket (51); the output ends of the DC double-axis motor (53) and the two ends of the synchronous roller (52) are connected to each other through a pulley drive assembly (54); the outer wall of the synchronous roller (52) is symmetrically slidably connected to a plurality of force-bearing rods (55); the inner wall of the synchronous roller (52) is slidably connected to a plurality of connecting rods (56) corresponding to the positions of the force-bearing rods (55); the rod walls on opposite sides of the force-bearing rods (55) and the connecting rods (56) are fixedly embedded with synchronous racks (57); the outer wall of the synchronous roller (52) is provided with a plurality of A rectangular opening is located between the force-bearing rod (55) and the connecting rod (56), and a synchronous gear (58) meshing with the synchronous rack (57) is rotatably connected in the corresponding rectangular opening. The inner wall and outer wall of the synchronous roller (52) are fixedly connected with a plurality of guide cylinders (59) slidingly sleeved outside the force-bearing rod (55) and the connecting rod (56). A fixed electromagnetic block (510) is fixedly embedded in the guide cylinder (59). The rod walls of the force-bearing rod (55) and the connecting rod (56) are fixedly embedded with a fixed permanent magnet block (511). One end of multiple force-bearing rods (55) on the same side is fixedly connected to the same flexible side strip (512). The lower side of one end of the linkage rod (10) is fixedly connected to a vertical rod (513). The lower end of the vertical rod (513) is fixedly connected to a push-pull ball (514) located between two flexible side strips (512). The identification and detection welding mechanism (6) includes a fixed plate (61) fixedly connected to the lower side of one end of the linkage rod (10), a steering motor (62) is fixedly installed on the lower side wall of the fixed plate (61), an output end of the steering motor (62) extends through the fixed plate (61) and is fixedly connected to a mounting block (63), a weld follower rod (64) is fixedly installed on the lower end of the mounting block (63), a motor rotating assembly (65) is also fixedly installed on the upper end of the mounting block (63), the upper output end of the motor rotating assembly (65) is fixedly connected to a transverse plate (66), and the two ends of the transverse plate (66) are respectively fixedly connected to an ultrasonic detection probe (67) and an arc welding head (68).

2. A welding device for steel structure in construction according to claim 1, characterized in that: The clamping rotation mechanism (2) comprises two side plates (21) symmetrically fixedly connected to the upper end of the base (1); a clamping double-axis motor (22) located between the two side plates (21) is fixedly installed on the upper end of the base (1); both output ends of the clamping double-axis motor (22) are fixedly connected with an adjusting screw (23); one end of the adjusting screw (23) is rotatably connected to the side wall of the side plate (21) through a bearing; the rod wall of the adjusting screw (23) is also threadedly sleeved with a support plate (24); a plurality of guide rods (25) are fixedly connected between the two side plates (21); the side wall of the support plate (24) is provided with a screw threadedly connected to the guide rod (25); ) a guide hole for sliding sleeve connection, a through hole is opened on the upper side wall of the support plate (24), and a rotating shaft (26) is rotatably sleeved in the corresponding through hole through a bearing, one end of the rotating shaft (26) extends into the welded steel pipe (8) and is fixedly connected to a support block (27), a plurality of micro electric push rods (28) are fixedly connected to the outer wall of the support block (27), and the output ends of the plurality of micro electric push rods (28) on the same side are fixedly connected to the same rubber support plate (29), a rotating motor (210) is fixedly installed on the outer wall of one of the support plates (24), and the output end of the rotating motor (210) is fixedly connected to one end of the rotating shaft (26).

3. A welding device for steel structure in construction according to claim 2, characterized in that: The intermediate supporting mechanism (3) comprises two arc-shaped supporting plates (31) symmetrically supported on the outer side of the lower end of the welded steel pipe (8), a plurality of support columns (32) are fixedly connected between the lower end of the arc-shaped supporting plate (31) and the upper end of the base (1), a plurality of ball grooves are evenly opened on the inner wall of the arc-shaped supporting plate (31), and universal balls (33) are fixedly installed in the corresponding ball grooves through a ball installation mechanism.

4. A welding device for steel structure in construction according to claim 3, characterized in that: The steel pipe outer wall cleaning mechanism (4) includes a U-shaped positioning plate (41) fixedly connected between two arc-shaped supporting plates (31), a horizontal portion of the U-shaped positioning plate (41) is provided with a plurality of through holes, and a push rod (42) is movably inserted into the corresponding through holes, the upper ends of the plurality of push rods (42) are fixedly connected to the same lifting plate (43), a surface of the lifting plate (43) is evenly provided with a plurality of through holes, and a transmission shaft (44) is rotatably sleeved in the corresponding through holes through a bearing, the upper end of the transmission shaft (44) is fixedly connected to a cleaning brush disc (45), the lower end of the lifting plate (43) is symmetrically fixedly connected to two bearing seats (46), the two bearing seats (46) ) is rotatably connected to a same wheel axle (47) through a bearing, both ends of the wheel axle (47) are fixedly connected to a driving roller (48), the wheel axle (47) and the transmission shaft (44) are connected in transmission via a bevel gear assembly (49), the lower ends of the plurality of push rods (42) are fixedly connected to a same push plate (410), the lower end of the U-shaped positioning plate (41) is fixedly connected to an attractive electromagnetic plate (411), the upper end of the push plate (410) is fixedly connected to an attractive permanent magnetic plate (412), the lower end of the U-shaped positioning plate (41) and the upper end of the push plate (410) are fixedly connected to a plurality of downward pressure springs (413) sleeved on the outside of the push rods (42).

5. A welding device for steel structure in construction according to claim 4, characterized in that: The welding temperature and speed control mechanism (7) comprises an insulating shell (71), wherein the inner walls of the upper and lower opposite sides of the insulating shell (71) are respectively fixedly connected with an arc welding resistance rod (72) and a motor resistance rod (73), and a side wall of one side of the insulating shell (71) is fixedly sleeved with an adjusting electric push rod (74), and the output end of the adjusting electric push rod (74) is fixedly connected with an insulating block (75), and the upper and lower ends of the insulating block (75) are respectively fixedly connected with an arc welding conductive contact (76) and a motor conductive contact (77), and the arc welding resistance rod (72) and the arc welding conductive contact (76) are electrically connected to the power supply circuit of the rear end welding mechanism of the arc welding head (68), and the motor conductive contact (77) and the motor resistance rod (73) are electrically connected to the power supply circuit of the DC dual-axis motor (53).

6. A welding method based on the construction steel structure welding device according to claim 5, characterized in that: The steps include: S1. First, two sections of welded steel pipe (8) are placed on the outside of a plurality of rubber support plates (29), and the micro electric push rod (28) is controlled by the PLC controller (11). The micro electric push rod (28) pushes the rubber support plate (29) to move, thereby quickly and stably fixing the welded steel pipe (8). Then, the clamping double-axis motor (22) is started, and the clamping double-axis motor (22) drives the adjusting screw (23) to rotate. The two sections of welded steel pipe (8) are brought close to each other through the threaded connection between the adjusting screw (23) and the support plate (24), so that the two sections of welded steel pipe (8) are stably and accurately contacted with each other. S2. The steering motor (62) drives the mounting block (63) to rotate, so that the weld follower rod (64) rotates to the lower side and extends into the weld between the two sections of welded steel pipes (8). The rotating motor (210) is started, and the rotating motor (210) drives the two sections of welded steel pipes (8) to rotate. The DC dual-axis motor (53) is synchronously controlled by the PLC controller (11) to operate synchronously. As the two sections of welded steel pipes (8) rotate, the weld follower rod (64) moves in the weld, thereby driving the weld follower rod (64) in the horizontal direction. The position is constantly moving to identify the specific position of the weld. The weld following rod (64) drives the vertical rod (513) and the push-pull ball (514) to move in the horizontal position along with the weld through the mounting block (63), the fixed plate (61), and the linkage rod (10). The DC dual-axis motor (53) drives the synchronous drum (52) to rotate through the pulley drive assembly (54). The lateral displacement of the push-pull ball (514) is coordinated with the rotation of the synchronous drum (52), so that the push-pull ball (514) is squeezed on the flexible edge strip (512) to proceed. The force rods (55) at different positions are pushed to move left and right as the position of the weld changes. The movement of the force rod (55) on one side drives the connecting rod (56) through the synchronous rack (57) and the synchronous gear (58) to drive the force rod (55) on the other side to move, so that the distance between the two relative force rods (55) remains constant, and then the position change of the weld between the two sections of welded steel pipes (8) is simulated between the two flexible side strips (512). Here, the outer diameter of the welded steel pipe (8) is equal to the outer diameter of the synchronous roller (52). Therefore, the weld seam changes of the welded steel pipe (8) can be completely presented on the outside of the synchronous roller (52). After one rotation, the rotating motor (210) and the DC dual-axis motor (53) stop moving synchronously, completing the memory fixation of the weld seam route. At this time, the PLC controller (11) supplies power to the fixed electromagnetic block (510), and the fixed electromagnetic block (510) cooperates with the fixed permanent magnet block (511) to enable the guide cylinder (59) to fix the stress rod (55) and the connecting rod (56), thereby achieving the memory fixation of the weld seam route. S3. When the path of the weld is memorized, power is supplied to the suction electromagnetic plate (411) synchronously. The suction electromagnetic plate (411) is energized to generate magnetism and cooperate with the suction permanent magnet plate (412) to drive the push plate (410) to overcome the elastic force of the downward pressure spring (413) and move upward, thereby causing the driving roller (48) and the cleaning brush plate (45) to contact the lower ends of the two sections of the welded steel pipe (8). As the welded steel pipe (8) rotates, the cleaning brush plate (45) and the welded steel pipe (8) move relative to each other to achieve rapid cleaning of the outer wall of the welded steel pipe (8), and the driving roller (48) rotates accordingly to drive the wheel shaft (47) to rotate. The wheel shaft (47) drives multiple transmission shafts (44) to rotate synchronously through the bevel gear assembly (49). The transmission shaft (44) drives the cleaning brush plate (45) to further rotate, thereby achieving further grinding and cleaning of the outer wall of the weld seam of the welded steel pipe (8); S4. Then, the mounting block (63) is driven to rotate 180 degrees by the steering motor (62), and the horizontal plate (66) is driven to rotate by the motor rotating assembly (65), so that the ultrasonic detection probe (67) moves to the upper end of the welded steel pipe (8). The PLC controller (11) starts the rotating motor (210) and the DC dual-axis motor (53). Since the outer surface of the synchronous roller (52) uses two flexible side strips (512) to fix the route of the weld, the push-pull ball (514) is pushed by the two flexible side strips (512) and the force rod (55) to drive the linkage rod (10) to move horizontally, thereby changing the position of the weld and feeding it back to the ultrasonic detection probe (67), so that the ultrasonic detection probe ( 67) always keeps the position change synchronous with the change of the weld position of the welded steel pipe (8). When the ultrasonic wave propagates to the discontinuity such as the defect or hole in the material, part of the sound energy will be reflected due to the discontinuity of the medium. The amplitude and waveform of the reflection depend on factors such as the shape, size, position and material properties of the defect or hole. Therefore, the ultrasonic detection probe (67) can accurately detect the defects and holes at the weld and feed back the detected defects to the PLC controller (11). The PLC controller (11) adjusts the action of the electric push rod (74) according to the number of defects and holes. Specifically, the more defects and holes there are, the longer the moving distance of the output end of the electric push rod (74) is adjusted. S5. Then, the motor rotating assembly (65) drives the horizontal plate (66) to rotate 180 degrees, so that the arc welding head (68) moves to the upper end of the weld, and the rotating motor (210) and the DC dual-axis motor (53) are started, so that the arc welding head (68) changes synchronously with the position change of the weld, and a stable welding operation is performed. During welding, the electric push rod (74) is adjusted to drive the arc welding conductive contact (76) and the motor conductive contact (77) to move on the arc welding resistance rod (72) and the motor resistance rod (73) respectively through the insulating block (75). The resistance value of the power supply circuit of the arc welding resistance rod (72) connected to the rear end welding mechanism of the arc welding head (68) is reduced, thereby increasing the power supply current, thereby controlling the energy and heat input of the welding arc, thereby increasing the welding temperature. The resistance value of the power supply circuit of the motor resistance rod (73) connected to the DC dual-axis motor (53) is increased, thereby reducing the power supply current, reducing the power speed of the DC dual-axis motor (53), slowing down the welding speed, and realizing adaptive adjustment of the welding temperature and speed based on defects and hole formation at the welding end of the welded steel pipe (8).

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