Steel structure bridge truss welding device

Abstract

This invention relates to the field of bridge truss welding technology, and provides a steel structure bridge truss welding device, including a base, a bearing plate at the top center of the base, a frame on one side of the bearing plate, a truss positioning fixture on the top of the frame, and angle adjustment parts symmetrically arranged on both sides of the truss positioning fixture; a moving mechanism on the top of the bearing plate, a welding adjustment mechanism on the moving mechanism, a strong cooling mechanism and a dual-welding-gun alternating welding mechanism on the welding adjustment mechanism; the dual-welding-gun alternating welding mechanism includes a rotating plate, which is movably connected to the welding adjustment mechanism, a motor three on one side inside the rotating plate, an output shaft connected to the output end of the motor three, the output shaft passing through the rotating plate, and a main gear two on the top. When the temperature exceeds a preset threshold, the device automatically switches to a backup welding gun to continue welding, while simultaneously forcibly cooling the overheated welding gun to avoid welding defects caused by overheating, without requiring machine shutdown for cooling.

Description

Technical Field

[0001] This invention provides a steel structure bridge truss welding device, belonging to the field of bridge truss welding technology. Background Technology

[0002] Steel bridge trusses are widely used in bridge engineering due to their high strength, light weight, and large span. Truss welding is the core process in the manufacture of steel bridge structures, and the welding quality directly determines the overall safety and service life of the bridge.

[0003] Chinese invention patent CN115106694B discloses a welding device for steel bridge trusses, including a base plate. A workbench is horizontally fixed on the upper surface of the base plate. A cylindrical groove is vertically formed on the upper surface of the workbench. A turntable is coaxially rotatably mounted in the cylindrical groove. Two cylindrical adjustment grooves are symmetrically and vertically formed through the upper surface of the turntable. A cylindrical adjustment block is coaxially rotatably mounted in each adjustment groove. Each adjustment block has a vertically formed placement groove. A drive groove is coaxially and vertically formed in the turntable. In this invention, through the cooperation of a first servo motor, a turntable, and a welding mechanism, the automated welding of steel bridge trusses can be achieved by the operator periodically placing web members into the corresponding placement grooves at the corresponding positions. This results in high work efficiency. Furthermore, when welding web members to the angle steel body, the pressure of the top plate on the web members ensures the welding stability between the web members and the angle steel body.

[0004] However, the above-mentioned patent still has the following shortcomings in actual use: the welding torch of the patent performs spray welding at the contact point between the web member and the two angle steel bodies. Since there are a large number of web members to be welded, the temperature of the welding torch will increase as the welding operation continues. It is necessary to stop the machine to cool the welding torch. Moreover, continuous welding with a single welding torch for a long time will cause the torch head to overheat, resulting in defects such as slag inclusion, porosity, and burn-through in the weld. Furthermore, overheating of the welding torch will accelerate electrode wear, and frequent shutdowns to replace the welding torch will significantly reduce welding efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a welding device for steel structure bridge trusses.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] A steel bridge truss welding device includes a base, a bearing plate at the center of the top of the base, a frame on one side of the bearing plate, a truss positioning fixture on the top of the frame, and symmetrical angle adjustment parts on both sides of the truss positioning fixture; a moving mechanism on the top of the bearing plate, a welding adjustment mechanism on the moving mechanism, a strong cooling mechanism and a double welding torch alternating welding mechanism on the welding adjustment mechanism; the double welding torch alternating welding mechanism includes a rotating plate, which is movably connected to the welding adjustment mechanism; a motor three is located on one side of the rotating plate, the output end of the motor three is connected to an output shaft, the output shaft passes through the rotating plate, and a main gear two is located on the top of the output shaft, with one side of the main gear two located at... A meshing secondary gear is located at the center of the top of the rotating plate. A rotating disk is located on top of the secondary gear. A working welding torch and a spare welding torch are located on opposite sides of the top of the rotating disk. A main cooling sleeve and a spare cooling sleeve are respectively fitted onto the ends of the working welding torch and the spare welding torch. Both the main cooling sleeve and the spare cooling sleeve are fixedly installed on the rotating disk through connecting ends. The main cooling sleeve is connected to the spare cooling sleeve through a connecting pipe, and the spare cooling sleeve is connected to the forced cooling mechanism through a hose. An infrared temperature sensor is located at the center of the top of the rotating disk. A controller is located on the moving mechanism. The controller is electrically connected to the moving mechanism, the welding adjustment mechanism, the forced cooling mechanism, and the dual welding torch alternating welding mechanism.

[0008] Furthermore, the main cooling jacket and the backup cooling jacket are internally configured with a spiral structure. The main cooling jacket has a main cooling pipe on one side, and the backup cooling jacket has a backup cooling pipe on the side corresponding to the main cooling pipe. The two ends of the connecting pipe are respectively connected to the main cooling pipe and the backup cooling pipe.

[0009] Furthermore, the welding adjustment mechanism includes a set of symmetrically arranged inverted L-shaped frames. The top of the inverted L-shaped frames is provided with a support, and a rotating shaft is transversely arranged between the supports. The rotating shaft passes through the rotating plate. A sector gear is provided on one side of the rotating plate. A main gear is provided below the sector gear. A gear shaft is inserted in the middle of one side of the main gear. A motor is provided at the end of the gear shaft away from the main gear. A motor support is provided at the bottom of the motor. The motor support is fixedly installed on the moving mechanism.

[0010] Furthermore, the forced cooling mechanism includes a cooling water tank, which is fixedly installed on the moving mechanism. A variable frequency water pump is installed inside the cooling water tank, and a water supply pipeline is connected to the variable frequency water pump. The other end of the water supply pipeline is connected to a pipe connection port provided on one side of the top of the cooling water tank. The other side of the pipe connection port is connected to the end of a flexible hose. A backup cooling pipeline is connected to the side of the flexible hose away from the pipe connection port. The backup cooling pipeline is connected to the lower side of the backup cooling jacket.

[0011] Furthermore, a boss is provided on the top of the support plate near the frame, and the moving mechanism is fixed on the side of the boss away from the frame.

[0012] Furthermore, the truss positioning fixture includes a support column, which is fixedly installed inside the frame. A U-shaped frame is provided at the top of the support column. A lower groove is provided at the center of the bottom wall of the U-shaped frame groove. A full gear is provided above the lower groove. A shaft is inserted through the middle of the full gear. Both ends of the shaft pass through both sides of the U-shaped frame. Several pressure plates are evenly fitted on the shaft. A pressure groove is provided at the bottom outer end of the pressure plate. A frame plate is provided at the top of the side of the frame away from the moving mechanism. A cylinder is provided at the top of the frame plate. A telescopically cooperating air rod is provided inside the cylinder. The air rod passes through the cylinder. A fixing block is provided at the top. A side toothed plate that meshes with the full gear is provided on the side of the fixing block corresponding to the full gear. The lower part of the side toothed plate passes through the frame plate.

[0013] Furthermore, the frame is symmetrically provided with an upper clamping plate and a lower clamping plate II on the upper and lower parts of one side of the bearing plate, and the distance between the upper clamping plate and the lower clamping plate II is adjusted according to the height of the truss to be welded.

[0014] Furthermore, the angle adjustment unit includes a mounting plate, which is detachably mounted on the outer edge of the side of the frame. A second motor is provided on the upper outer side of the mounting plate away from the frame. A lead screw is connected to the output end of the second motor. Two sets of threaded structures are symmetrically arranged on the lead screw, and an upper column is fitted on each of the threaded structures. A guide rod is provided on the lower outer side of the mounting plate away from the second motor. Two sets of lower columns are fitted on the guide rod. The lower columns are connected and fixed to the upper columns by a vertical rod. Clamping blocks are symmetrically arranged at the top of the adjacent set of upper columns and the bottom of the lower columns. An expansion semi-circular block is provided on the inner wall of the clamping block.

[0015] Furthermore, the moving mechanism includes a second track, which is fixedly installed at the top center of the support plate. A second electric slide block is provided on the second track, and a moving plate is provided on the top of the second electric slide block. Several inlay grooves are provided on the inner side of the moving plate, and a support spring is provided in the inlay groove. The outer end of the support spring passes through the inlay groove and is fixed to the outer wall of the lower clamping plate. A fixed plate is provided on the top of the moving plate, and a first track is provided at the top center of the fixed plate. A first electric slide block is provided on the first track, and the welding adjustment mechanism and the strong cooling mechanism are both fixed on the top of the first electric slide block.

[0016] Furthermore, limiting blocks are provided on both sides of the fixing plate.

[0017] The beneficial effects of this invention are:

[0018] The working welding torch temperature is monitored in real time by an infrared temperature sensor. When the temperature exceeds the preset threshold, the backup welding torch is automatically switched to continue welding. At the same time, the overheated welding torch is forcibly cooled to avoid welding defects caused by overheating of the welding torch. There is no need to stop the machine to wait for cooling.

[0019] The cooling jacket adopts a spiral guide groove structure to increase the heat exchange area between the coolant and the welding torch and extend the heat exchange time; the standby welding torch is pre-cooled through a connecting pipe in standby mode and can reach the optimal working temperature immediately after switching.

[0020] The truss positioning fixture uses a gear and rack driven pressure plate clamping, which provides uniform clamping force and high positioning accuracy. The angle adjustment unit achieves multi-angle precise adjustment of truss members through screw and nut transmission, and can adapt to any welding angle within the range of 0-90°.

[0021] The moving mechanism can move automatically in both forward and backward and left and right directions, while the welding adjustment mechanism can automatically adjust the welding angle from 0 to 120°. Together with the controller, it can achieve fully automated welding, reduce manual labor intensity, and improve welding consistency.

[0022] The clamping block adopts an inflatable expansion semi-circular block design, which can ensure a firm clamping while avoiding scratches and deformations on the surface of the truss members caused by rigid clamping. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of a steel bridge truss welding device according to the present invention;

[0025] Figure 2 This is a schematic diagram of the connection structure between the truss positioning fixture and the frame of a steel structure bridge truss welding device according to the present invention;

[0026] Figure 3 This is a schematic diagram of the pressure plate structure of a steel bridge truss welding device according to the present invention;

[0027] Figure 4 This is a schematic diagram of the truss positioning fixture structure of a steel structure bridge truss welding device according to the present invention;

[0028] Figure 5 This is a schematic diagram of the gear drive structure of the truss positioning fixture of a steel structure bridge truss welding device according to the present invention.

[0029] Figure 6 This is a schematic diagram of the angle adjustment section of a steel bridge truss welding device according to the present invention;

[0030] Figure 7 This is a schematic diagram of the alternating welding mechanism of a double welding gun in a steel structure bridge truss welding device according to the present invention;

[0031] Figure 8 This is a schematic diagram of the welding adjustment mechanism of a steel structure bridge truss welding device according to the present invention;

[0032] Figure 9 This is a schematic diagram of the plate-moving structure of a steel bridge truss welding device according to the present invention.

[0033] In the diagram, 1. Base; 2. Bearing plate; 3. Frame; 4. Truss positioning fixture; 41. Support column; 42. U-shaped frame; 43. Lower groove; 44. Full gear; 45. Shaft; 46. Pressure plate; 47. Pressure groove; 48. Frame plate; 49. Cylinder; 410. Air rod; 411. Fixing block; 412. Side toothed plate; 5. Angle adjustment part; 51. Mounting plate; 52. Motor II; 54. Lead screw; 55. Upper column; 56. Guide rod; 57. Lower column; 58. Upright pole; 59. Clamping block; 6. Moving mechanism; 61. Controller; 62. Track II; 63. Electric slide II; 64. Moving plate; 65. Support spring; 66. Lower clamping plate I; 67. Fixing plate; 68. Track I; 69. Electric slide 7. Welding adjustment mechanism; 71. Inverted L-shaped frame; 72. Support; 73. Rotating shaft; 74. Sector gear; 75. Main gear one; 76. Motor one; 77. Motor support; 8. Strong cooling mechanism; 81. Cooling water tank; 82. Pipe connection port; 83. Backup cooling pipe one; 9. Dual welding torch alternating welding mechanism; 91. Rotating plate; 93. Main gear two; 94. Secondary gear; 95. Rotary disk; 96. Working welding torch; 97. Backup welding torch; 98. Main cooling jacket; 99. Backup cooling jacket; 910. Connecting pipe; 911. Hose; 912. Infrared temperature sensor; 913. Main cooling pipe; 914. Backup cooling pipe two; 10. Boss; 11. Upper clamping plate; 12. Lower clamping plate two. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1-9This invention provides a technical solution for a steel structure bridge truss welding device, including a base 1, a bearing plate 2 at the top center of the base 1, a frame 3 on one side of the bearing plate 2, a truss positioning fixture 4 on the top of the frame 3, and angle adjustment parts 5 symmetrically arranged on both sides of the truss positioning fixture 4; a moving mechanism 6 on the top of the bearing plate 2, a welding adjustment mechanism 7 on the moving mechanism 6, a strong cooling mechanism 8 and a double welding gun alternating welding mechanism 9 on the welding adjustment mechanism 7; the double welding gun alternating welding mechanism 9 includes a rotating plate 91, which is movably connected to the welding adjustment mechanism 7, a motor 92 on one side inside the rotating plate 91, an output shaft connected to the output end of the motor 92, the output shaft passing through the rotating plate 91, a main gear 93 on the top of the output shaft, and one side of the main gear 93 located on the top of the rotating plate 91. A secondary gear 94 is provided at the center of the part, and a rotating disk 95 is provided on the top of the secondary gear 94. A working welding torch 96 and a spare welding torch 97 are respectively provided on the two sides of the top of the rotating disk 95. A main cooling sleeve 98 and a spare cooling sleeve 99 are respectively fitted on the ends of the working welding torch 96 and the spare welding torch 97. The main cooling sleeve 98 and the spare cooling sleeve 99 are both fixedly installed on the rotating disk 95 through connecting ends. The main cooling sleeve 98 is connected to the spare cooling sleeve 99 through a connecting pipe 910. The spare cooling sleeve 99 is connected to the strong cooling mechanism 8 through a hose 911. An infrared temperature sensor 912 is provided at the center of the top of the rotating disk 95. A controller 61 is provided on the moving mechanism 6. The controller 61 is electrically connected to the moving mechanism 6, the welding adjustment mechanism 7, the strong cooling mechanism 8 and the dual welding torch alternating welding mechanism 9.

[0036] Infrared temperature sensor monitors the temperature of the working welding torch in real time. When the temperature exceeds the preset threshold, the controller automatically controls the motor to rotate, and the rotating disk 95 rotates 180° through gear transmission, switching the standby welding torch 97 to the working position. At the same time, the cooling system automatically forces the overheated welding torch to cool down.

[0037] Initially, the working welding torch 96 is aligned with the node to be welded, while the standby welding torch 97 is in a standby pre-cooling state. The welding program is started, and the working welding torch 96 begins welding. The infrared temperature sensor 912 monitors the temperature of the working welding torch 96 in real time. When the temperature of the working welding torch 96 exceeds the preset maximum temperature, the controller 61 immediately sends a signal to pause welding and simultaneously starts motor three. Motor three drives the main gear two 93 to rotate, which meshes with the secondary gear 94, driving the secondary gear 94 and the rotating disk 95 to rotate 180°, switching the standby welding torch 97 to the working position and the original working welding torch 96 to the standby cooling position. After rotation to the correct position, the controller 61 controls the standby welding torch 97 to continue welding, while the strong cooling mechanism 8 increases the coolant flow rate to rapidly cool the original working welding torch 96. When the temperature of the original working welding torch 96 drops below the preset minimum temperature, it enters the standby pre-cooling state, waiting for the next switch. These steps are repeated to achieve alternating continuous welding with dual welding torches until all welding nodes are completed.

[0038] See Figure 7 , Figure 8 The main cooling jacket 98 and the backup cooling jacket 99 are internally configured with a spiral guide channel structure. A main cooling pipe 913 is located on one side of the main cooling jacket 98, and a backup cooling pipe 914 is located on the opposite side of the backup cooling pipe 913 on the backup cooling jacket 99. The two ends of the connecting pipe 910 are connected to the main cooling pipe 913 and the backup cooling pipe 914, respectively. A one-way return valve is located at the end of the main cooling pipe 913. The return valve is connected to the return port of the cooling water tank 81 via a return hose, forming a complete cooling cycle. The welding adjustment mechanism 7 includes a set of symmetrically arranged inverted L-shaped frames 71. The top of the inverted L-shaped frame 71 is provided with a support 72, and a rotating shaft 73 is transversely arranged between the supports 72. The rotating shaft 73 passes through the rotating plate 91. A sector gear 74 is provided on one side of the rotating plate 91. A meshing main gear 75 is provided below the sector gear 74. A gear shaft is inserted in the middle of the side of the main gear 75. A motor 76 is provided at the end of the gear shaft away from the main gear 75. A motor support 77 is provided at the bottom of the motor 76. The motor support 77 is fixedly installed on the moving mechanism 6. Angle encoders are provided at both ends of the rotating shaft 73. The angle encoders are electrically connected to the controller 61 to realize closed-loop control of the welding angle.

[0039] The motor drives the gear to mesh with the sector gear 74, which in turn drives the rotating shaft 73 and the rotating plate 91 to rotate, thereby realizing continuous adjustment of the welding angle of the welding gun. This is combined with the angle encoder to achieve closed-loop control.

[0040] Based on the bevel angle of the node to be welded, the required welding angle is set on the controller 61; the motor 76 is started, which drives the main gear 75 to rotate. The main gear 75 meshes with the sector gear 74, driving the sector gear 74 and the rotating shaft 73 to rotate synchronously; the rotating shaft 73 drives the rotating plate 91 and the double welding gun alternating welding mechanism 9 to rotate as a whole, adjusting the tilt angle of the welding gun; the angle encoder detects the rotation angle of the rotating shaft 73 in real time and feeds the signal back to the controller 61. When the preset angle is reached, the controller 61 controls the motor 76 to stop running; during the welding process, the welding angle can be finely adjusted in real time according to the weld formation.

[0041] See Figure 7 , Figure 8The forced cooling mechanism 8 includes a cooling water tank 81, which is fixedly installed on the moving mechanism 6. A variable frequency water pump is installed inside the cooling water tank 81, and a water supply pipeline is connected to the variable frequency water pump. The other end of the water supply pipeline is connected to a pipe connection port 82 provided on one side of the top of the cooling water tank 81. The other side of the pipe connection port 82 is connected to the end of a flexible hose 911. A backup cooling pipeline 83 is connected to the side of the flexible hose 911 away from the pipe connection port 82. The backup cooling pipeline 83 is connected to the lower side of the backup cooling jacket 99. A refrigeration coil and a temperature sensor are installed inside the cooling water tank 81. The temperature sensor is electrically connected to the controller 61.

[0042] The low-temperature coolant is delivered to the cooling jacket by a variable frequency water pump. A spiral flow guiding structure is used to achieve full heat exchange between the coolant and the welding torch. At the same time, the standby welding torch 97 is pre-cooled through the connecting pipe 910.

[0043] Add sufficient coolant to the cooling water tank 81; start the cooling coil and temperature sensor in the cooling water tank 81 to cool the coolant temperature to the preset value; 5 minutes before welding begins, start the variable frequency water pump to circulate the coolant in the cooling system and pre-cool the main cooling jacket 98 and the backup cooling jacket 99; during welding, the controller 61 automatically adjusts the speed of the variable frequency water pump and controls the coolant flow rate according to the welding torch temperature detected by the infrared temperature sensor 912 to ensure that the welding torch temperature is stable within the optimal working range; after welding is completed, the variable frequency water pump continues to run for 5 minutes until the welding torch temperature drops to room temperature before stopping.

[0044] See Figures 3-5 The top of the bearing plate 2, near the side of the frame 3, has a boss 10. The moving mechanism 6 is fixed on the side of the boss 10 away from the frame 3. The truss positioning fixture 4 includes a support column 41, which is fixedly installed inside the frame 3. The top of the support column 41 has a U-shaped frame 42. The center of the bottom wall of the U-shaped frame 42 has a lower groove 43. Above the lower groove 43 is a full gear 44. A shaft 45 is inserted through the middle of the full gear 44. Both ends of the shaft 45 pass through both sides of the U-shaped frame 42. Several pressure plates 46 are evenly fitted on the shaft 45. The bottom outer end of the pressure plate 46 has a pressure groove 47. The top of the frame 3, away from the moving mechanism 6, has a frame plate 48. The top of the frame 8 is equipped with a cylinder 49, and the cylinder 49 is equipped with a telescopically cooperating air rod 410. The air rod 410 passes through the cylinder 49. The top is equipped with a fixing block 411. The fixing block 411 is equipped with a side tooth plate 412 that meshes with the full gear 44 on one side. The lower part of the side tooth plate 412 passes through the frame plate 48 and is slidably connected to the frame plate 48. The frame 3 is symmetrically equipped with an upper clamping plate 11 and a lower clamping plate 2 on the upper and lower parts of the side of the bearing plate 2. The distance between the upper clamping plate 11 and the lower clamping plate 2 is adjusted according to the height of the truss to be welded. The bottom of the upper clamping plate 11 and the top of the lower clamping plate 2 are equipped with anti-slip rubber pads to increase the clamping friction.

[0045] The cylinder 49 drives the side gear plate 412 to move up and down, which in turn drives the full gear 44 to rotate, thereby causing the pressure plate 46 on the shaft 45 to swing synchronously, thus realizing the rapid clamping and loosening of the main members of the truss.

[0046] Adjust the distance between the upper clamping plate 11 and the lower clamping plate 12 to match the height of the truss to be welded, and tighten the fixing bolts; start the cylinder 49, the air rod 410 drives the fixing block 411 and the side toothed plate 412 to move upward, the side toothed plate 412 meshes with the full gear 44, driving the full gear 44 to rotate clockwise; the full gear 44 drives the shaft 45 to rotate synchronously, and the multiple pressure plates 46 on the shaft 45 swing downward at the same time, the pressure groove 47 at the bottom of the pressure plate 46 presses against the upper surface of the main member of the truss, completing the initial positioning and clamping of the truss; after welding is completed, the cylinder 49 moves in the opposite direction, the air rod 410 drives the side toothed plate 412 to move downward, the full gear 44 rotates counterclockwise, the pressure plate 46 is lifted upward, and the truss is released.

[0047] See Figure 6 The angle adjustment part 5 includes a mounting plate 51, which is detachably mounted on the outer edge of the side of the frame 3. A second motor 52 is provided on the upper outer side of the mounting plate 51 away from the frame 3. A lead screw 54 is connected to the output end of the second motor 52. Two sets of threaded structures with opposite directions are symmetrically arranged on the lead screw 54. An upper column 55 is fitted on each of the threaded structures. A guide rod 56 is provided on the lower outer side of the mounting plate 51 away from the second motor 52. Two sets of lower columns 57 are fitted on the guide rod 56. The lower columns 57 and the upper columns 55 are connected and fixed by a vertical rod 58. Clamping blocks 59 are symmetrically arranged on the top of an adjacent set of upper columns 55 and the bottom of a set of lower columns 57. An expansion semicircular block is provided on the inner wall of the clamping block 59. An air chamber is provided inside the expansion semicircular block. The flexible clamping of the truss members is achieved by inflating with an external air pump.

[0048] The motor drives the screws 54 to rotate in opposite directions, which in turn causes the two sets of upper columns 55 to move in opposite directions along the screws 54. This, in turn, causes the truss members to rotate around the main node through the clamping block 59, thus achieving precise adjustment of the welding angle.

[0049] According to the length and angle of the truss members to be welded, the two sets of angle adjustment parts 5 are installed in the corresponding positions of the frame 3 by bolts; the second motor 52 is started, and the second motor 52 drives the lead screw 54 to rotate. Since the two sets of threads on the lead screw 54 rotate in opposite directions, the two sets of upper columns 55 move in opposite directions along the lead screw 54; the upper columns 55 drive the lower columns 57 to move synchronously along the guide rod 56 through the upright 58, so that the upper and lower sets of clamping blocks 59 gradually approach the truss members; when the clamping blocks 59 contact the truss members, the external air pump is started to inflate the air chamber of the expansion semicircle, so that the expansion semicircle expands and clamps the truss members; the second motor 52 is controlled to rotate, and the two sets of clamping blocks 59 drive the truss members to rotate around the main node. The angle is observed and adjusted through the angle scale on the frame 3 until the preset welding angle is reached; after welding is completed, the gas in the expansion semicircle is first discharged, and then the second motor 52 is controlled to rotate in the opposite direction, so that the clamping blocks 59 release the truss members.

[0050] See Figure 4 , Figure 5 , Figures 8-9 The moving mechanism 6 includes a second track 62, which is fixedly installed at the top center of the support plate 2. A sliding electric slide 63 is mounted on the second track 62. A moving plate 64 is mounted on the top of the electric slide 63. Several inlay grooves are provided on the inner side of the moving plate 64, and a support spring 65 is installed in each groove. The outer end of the support spring 65 protrudes from the inlay groove and is fixed to the outer wall of the lower clamping plate 66. A fixing plate 67 is mounted on the top of the moving plate 64. A first track 68 is located at the top center of the fixing plate 67. A sliding electric slide 69 is mounted on the first track 68. The welding adjustment mechanism 7 and the strong cooling mechanism 8 are both fixed on the top of the electric slide 69. Limiting blocks are provided on both sides of the fixing plate 67. Scale lines are provided on both the first track 68 and the second track 62 to facilitate precise adjustment of the welding position.

[0051] The welding mechanism can move precisely in both forward and backward and left and right directions by sliding along the track with an electric slide block, adapting to welding nodes at different positions.

[0052] Start the electric slide block 2 63, which moves back and forth along the track 2 62, driving the moving plate 64 and the welding mechanism above to move back and forth as a whole, adjusting the front and back position of the welding; start the electric slide block 1 69, which moves left and right along the track 1 68, driving the welding adjustment mechanism 7 and the double welding gun alternating welding mechanism 9 to move left and right, adjusting the left and right position of the welding; during the movement, observe the movement distance through the scale lines on the track, and stop the electric slide block when the welding mechanism is aligned with the node to be welded; the lower clamping plate 1 66 is elastically connected to the moving plate 64 through the support spring 65, which can provide auxiliary support for the truss during the welding process, and at the same time absorb the vibration generated by welding.

[0053] The circuits and electronic components, modules and controllers, or the heat dissipation holes and maintenance doors in the space of the adapted electrical equipment are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated. The content protected by this application does not involve improvements to software and methods or heat dissipation and maintenance.

[0054] During use, check that all components of the device are functioning properly, add coolant to the cooling water tank 81, connect the power and air supply, and input welding parameters and welding torch temperature threshold into the controller 61; place the truss to be welded on the truss positioning fixture 4, start the cylinder 49 to complete the initial clamping, and then use the angle adjustment unit 5 to clamp and position the ends of the truss members; adjust the front, back, left, and right positions of the welding mechanism through the moving mechanism 6, and adjust the welding angle of the welding torch through the welding adjustment mechanism 7 to ensure that the welding torch is accurately aligned with the node to be welded; start the welding program, with the two welding torches welding alternately, and the strong cooling mechanism 8 simultaneously cooling the welding torches, while the controller 61 monitors the welding process in real time; after all nodes are welded, stop the welding program, turn off the strong cooling mechanism 8, loosen the angle adjustment unit 5 and the truss positioning fixture 4, and remove the welded truss; clean the welding slag and debris from the device, check the condition of the welding torch and cooling system, and replace any worn parts in a timely manner.

[0055] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A steel structure bridge truss welding device, characterized in that, It includes a base (1), a bearing plate (2) at the top center of the base (1), a frame (3) on one side of the bearing plate (2), a truss positioning fixture (4) on the top of the frame (3), and angle adjustment parts (5) symmetrically arranged on both sides of the truss positioning fixture (4); a moving mechanism (6) on the top of the bearing plate (2), a welding adjustment mechanism (7) on the moving mechanism (6), a strong cooling mechanism (8) and a double welding gun alternating welding mechanism (9) on the welding adjustment mechanism (7); The alternating welding mechanism (9) includes a rotating plate (91), which is movably connected to the welding adjustment mechanism (7). A motor (92) is provided on one side of the rotating plate (91). An output shaft is connected to the output end of the motor (92). The output shaft passes through the top of the rotating plate (91) and is provided with a main gear (93). A meshing secondary gear (94) is provided on one side of the main gear (93) at the center of the top of the rotating plate (91). A rotating disk (95) is provided on the top of the secondary gear (94). Working welding guns (94) are provided on both sides of the top of the rotating disk (95). 6) and spare welding gun (97). The working welding gun (96) and spare welding gun (97) are respectively fitted with a main cooling sleeve (98) and a spare cooling sleeve (99). The main cooling sleeve (98) and the spare cooling sleeve (99) are fixedly installed on the rotating disk (95) through the connecting end. The main cooling sleeve (98) is connected to the spare cooling sleeve (99) through the connecting pipe (910). The spare cooling sleeve (99) is connected to the strong cooling mechanism (8) through the hose (911). An infrared temperature sensor (912) is provided at the center of the top of the rotating disk (95). The moving mechanism (6) is equipped with a controller (61), which is electrically connected to the moving mechanism (6), the welding adjustment mechanism (7), the strong cooling mechanism (8), and the dual welding gun alternating welding mechanism (9).

2. The steel structure bridge truss welding device according to claim 1, characterized in that, The main cooling jacket (98) and the backup cooling jacket (99) are internally spiral structures. The main cooling jacket (98) has a main cooling pipe (913) on one side, and the backup cooling jacket (99) has a backup cooling pipe (914) on the side corresponding to the main cooling pipe (913). The two ends of the connecting pipe (910) are connected to the main cooling pipe (913) and the backup cooling pipe (914) respectively.

3. The steel structure bridge truss welding device according to claim 1, characterized in that, The welding adjustment mechanism (7) includes a set of symmetrically arranged inverted L-shaped frames (71). The top of the inverted L-shaped frames (71) is provided with a support (72). A rotating shaft (73) is provided between the supports (72). The rotating shaft (73) passes through the rotating plate (91). A sector gear (74) is provided on one side of the rotating plate (91). A meshing main gear (75) is provided below the sector gear (74). A gear shaft is inserted in the middle of the side of the main gear (75). A motor (76) is provided at the end of the gear shaft away from the main gear (75). A motor support (77) is provided at the bottom of the motor (76). The motor support (77) is fixedly installed on the moving mechanism (6).

4. The steel structure bridge truss welding device according to claim 1, characterized in that, The forced cooling mechanism (8) includes a cooling water tank (81), which is fixedly installed on the moving mechanism (6). The cooling water tank (81) is equipped with a variable frequency water pump, and a water supply pipeline is connected to the variable frequency water pump. The other end of the water supply pipeline is connected to a pipe connection port (82) set on one side of the top of the cooling water tank (81). The other side of the pipe connection port (82) is connected to the end of the hose (911). A backup cooling pipeline (83) is connected to the side of the hose (911) away from the pipe connection port (82). The backup cooling pipeline (83) is connected to the lower side of the backup cooling sleeve (99).

5. The steel structure bridge truss welding device according to claim 1, characterized in that, The top of the support plate (2) is provided with a boss (10) on the side near the frame (3), and the moving mechanism (6) is fixed on the side of the boss (10) away from the frame (3).

6. The steel structure bridge truss welding device according to claim 1, characterized in that, The truss positioning fixture (4) includes a support column (41), which is fixedly installed in the frame (3). A U-shaped frame (42) is provided at the top of the support column (41). A lower groove (43) is provided at the center of the bottom wall of the U-shaped frame (42). A full gear (44) is provided above the lower groove (43). A shaft (45) is inserted in the middle of the full gear (44). Both ends of the shaft (45) pass through both sides of the U-shaped frame (42). Several pressure plates (46) are evenly fitted on the shaft (45). A pressure groove (47) is provided at the bottom outer end of the pressure plate (46). The top of the frame (3) away from the moving mechanism (6) is provided with a frame plate (48), the top of the frame plate (48) is provided with a cylinder (49), the cylinder (49) is provided with a telescopically cooperating air rod (410), the air rod (410) passes through the cylinder (49), and the top is provided with a fixing block (411). The fixing block (411) is provided with a side tooth plate (412) on the side corresponding to the full gear (44) that meshes with the full gear (44), and the lower part of the side tooth plate (412) passes through the frame plate (48).

7. A steel structure bridge truss welding device according to claim 1, characterized in that, The frame (3) is symmetrically provided with an upper clamping plate (11) and a lower clamping plate (12) on the upper and lower sides of one side of the bearing plate (2). The distance between the upper clamping plate (11) and the lower clamping plate (12) is adjusted according to the height of the truss to be welded.

8. A steel structure bridge truss welding device according to claim 1, characterized in that, The angle adjustment part (5) includes a mounting plate (51). The mounting plate (51) is detachably mounted on the outer edge of the side of the frame (3). A second motor (52) is provided on the upper side of the outer side of the mounting plate (51) away from the frame (3). A lead screw (54) is connected to the output end of the second motor (52). Two sets of threaded structures are symmetrically arranged on the lead screw (54). An upper column (55) is sleeved on each of the threaded structures. A guide rod (56) is provided on the lower outer side of the mounting plate (51) away from the motor (52). Two sets of lower columns (57) are sleeved on the guide rod (56). The lower columns (57) and the upper columns (55) are connected and fixed by a vertical rod (58). Clamping blocks (59) are symmetrically provided on the top of the adjacent set of upper columns (55) and the bottom of the lower columns (57). The inner wall of the clamping blocks (59) is provided with an expansion semi-circular block.

9. A steel structure bridge truss welding device according to claim 1, characterized in that, The moving mechanism (6) includes a second track (62), which is fixedly installed at the top center of the bearing plate (2). The second track (62) is provided with a sliding electric slide (63), and the top of the electric slide (63) is provided with a moving plate (64). The inner side of the moving plate (64) is provided with several inlay grooves, and a support spring (65) is provided in the inlay groove. The outer end of the support spring (65) passes through the inlay groove and is fixed on the outer wall of the lower clamping plate (66). The top of the moving plate (64) is provided with a fixed plate (67), and a track (68) is provided at the center of the top of the fixed plate (67). A sliding electric slide (69) is provided on the track (68). The welding adjustment mechanism (7) and the strong cooling mechanism (8) are both fixed on the top of the electric slide (69).

10. A steel structure bridge truss welding device according to claim 9, characterized in that, Limiting blocks are provided on both sides of the fixing plate (67).

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