Web joint welding equipment for road and bridge construction

Abstract

The invention discloses web joint welding equipment for road and bridge construction, and relates to the technical field of road and bridge construction welding equipment.The web joint welding equipment comprises a portal frame, the top of the portal frame is provided with a plate frame, the plate frame is internally provided with a driving shaft rod and a follow-up shaft rod, the periphery of the plate frame is sleeved with a cam disc and a swing plate, an arm plate is installed between the cam disc and the swing plate, and a shaft sleeve is installed on the swing plate; and an output shaft rod and a swing plate are arranged in the shaft sleeve, a limiting assembly is installed at the inner end of the output shaft rod, a carrying plate is fixedly installed at the outer end of the output shaft rod, and a laser welding machine is installed on the outer side of the carrying plate. A traditional three-axis servo system is replaced by a mechanical transmission mechanism driven by a single alternating current motor, so that the equipment cost and the debugging difficulty are greatly reduced, and the reliability of welding operation is improved; while the web joint welding process requirements are met, dual optimization of the purchase cost and the operation and maintenance burden is achieved, and popularization and application of the laser welding technology in the field of road and bridge construction are powerfully promoted.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology for road and bridge construction, and specifically discloses a welding equipment for web joints in road and bridge construction. Background Technology

[0002] In bridge and road construction, I-beams, as core load-bearing components, are widely used in temporary supports, permanent structures, and composite beam systems due to their excellent bending resistance and moment of inertia, effectively bearing various dynamic and static loads during construction and operation. To ensure the stability and safety of the overall structure, the web joints must be tightly welded. As the main shear-bearing part, welding the joints of the web ensures the continuous transfer of the steel's mechanical properties, effectively preventing localized stress concentration or excessive shear deformation caused by gaps in the joints. At the same time, high-quality welding significantly improves the overall stiffness and fatigue resistance of the beam, and prevents moisture and impurities from entering the joints and causing corrosion, thereby extending the service life of the structure.

[0003] The utility model with authorization announcement number CN222818208U discloses a large I-beam welding platform. This prior art can effectively adapt to I-beams of various sizes by using multiple sets of positioning mechanisms. The core components of the above welding platform are a laterally sliding pad and a vertically adjustable pressure block. The former achieves flexible centering of the support point through a T-shaped slide groove and a threaded tube, while the latter achieves arbitrary adjustment of the clamping height by means of a limiting guide groove and an adjusting stud.

[0004] Since the web joint of the I-beam consists of two parallel three-dimensional linear welds, in order to enable the laser welding head to move along the length of the weld, switch laterally between the two welds, and adjust the focusing distance according to the height of the web, it must have independent movement capabilities in the X, Y, and Z axes. Three-axis machine tools, due to their mature structure and simple control, can be used in conjunction with the above-mentioned existing technologies for welding operations.

[0005] In practical applications of automated welding for I-beam web joints, achieving precise positioning of the laser welding head in three axes typically requires at least three sets of high-performance servo motors and drive systems, along with expensive mechanical components such as high-precision linear guides and ball screws, resulting in high equipment procurement costs. More critically, the servo motors and their control systems have inherent technical limitations. Relying on encoder closed-loop feedback and complex PID parameter tuning, they are not only difficult to debug but also demand highly skilled operators. In bridge and road construction or steel structure fabrication sites, dust and temperature variations can easily affect the servo motor's response accuracy and heat dissipation performance. Furthermore, their overload capacity is limited, and prolonged high-frequency operation can easily lead to overheating. Driver maintenance relies on specialized equipment, making on-site troubleshooting and repair extremely difficult in case of malfunction, severely impacting continuous operation. For relatively simple and highly repetitive linear trajectories like I-beam web welding, the multi-functional motion redundancy provided by three-axis machine tools results in significant resource waste. The high purchase costs and heavy maintenance burden greatly restrict the development of laser welding technology in the steel structure manufacturing field. Summary of the Invention

[0006] To address the issues of high equipment procurement costs and difficulties in troubleshooting and maintenance in current web joint welding operations for I-beams, this invention provides a web joint welding device for bridge and road construction.

[0007] To address the above problems, the present invention provides the following technical solution: A welding device for web joints in bridge and road construction includes a gantry frame. A plate frame is fixedly installed on one side of the top of the gantry frame. A drive shaft and a follower shaft with rotational engagement are installed inside the plate frame. A cam disk and a swing plate are respectively fastened to the periphery of the drive shaft and the follower shaft. A transmission engagement arm plate is loaded between the cam disk and the swing plate. A bushing is fixedly installed on the swing plate. An output shaft with rotational engagement is provided inside the bushing. A limiting component is installed at the inner end of the swing plate and the output shaft. A mounting plate is fastened to the outer end of the output shaft. The limiting component is used to limit the transmission mounting plate to rotate 90° around the axis of the output shaft. A laser welding machine is fixedly installed on the outer side of the mounting plate.

[0008] Preferably, a motor carrier is fixedly installed on the gantry frame, an AC motor is stably installed on the motor carrier, and the output shaft of the AC motor is connected to the drive shaft rod.

[0009] Preferably, the cam plate has a cam groove, the arm plate has an L-shaped structure, a central bearing shaft is fastened to the middle of the arm plate, the central bearing shaft can rotate with the plate frame, a first plug rod is fixedly installed at one end of the swing plate, a first ring is rotatably installed at the inner end of the first plug rod, the first ring is arranged in the cam groove and slides with it, a connecting rod is hinged to the outer side of the other end of the arm plate, and a clamping plate is installed on the swing plate, the clamping plate is hinged to the connecting rod.

[0010] Preferably, the cam groove includes a first circular groove portion and a second circular groove portion, the first circular groove portion and the second circular groove portion are smoothly connected, and the arc radius of the first circular groove portion is larger than the arc radius of the second circular groove portion.

[0011] Preferably, the limiting component includes a linkage plate hinged to the inner end of the output shaft rod. The linkage plate is arranged between the plate frame and the swing plate. A second plug rod is fixedly installed on the linkage plate. A second ring is rotatably installed on the inner end of the second plug rod. A first strip-shaped through groove is provided on the plate frame. The second ring is arranged in the first strip-shaped through groove and slides in cooperation with it.

[0012] Preferably, the angle between the first strip groove and the horizontal direction is 45°.

[0013] Preferably, the limiting component further includes an arc-shaped rail plate, which is arranged on the outside of the swing plate and fastened to the plate frame. A second strip-shaped through groove is provided in the swing plate, and a third plug rod is fixedly installed in the second strip-shaped through groove. A third ring is rotatably installed on the periphery of the third plug rod, and the outer wall of the third ring can slide with the inner side of the arc-shaped rail plate.

[0014] Preferably, the bottom of the gantry frame is provided with a passageway to facilitate the passage of the I-beams, the passageway is arranged below the plate frame, and the welding head of the laser welding machine is a telescopic structure.

[0015] Preferably, a control box is fixedly installed on the outside of the frame. The control box has an operation area and a display area. The operation area has a power switch, an emergency stop switch, a reset button, and a shutter control button. The display area has a progress display screen and a parameter display screen. A multi-lamp warning device is installed on the top of the control box.

[0016] Preferably, a suspension frame is fixedly installed on the inner side of the plate frame, and multiple wire-passing holes arranged on the plate frame are provided above the suspension frame. A vision sensor is fixedly installed inside the suspension frame, with the head of the vision sensor facing downwards.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention addresses the core problems of high equipment cost, complex debugging, and difficult on-site maintenance caused by the use of three-axis servo motor machine tools in existing technologies. It proposes an innovative mechanical automation solution. This equipment uses a single ordinary AC motor as the sole power source, completely eliminating the need for multiple high-performance servo motors, precision ball screws, and complex closed-loop control systems required in traditional solutions. Its core lies in the coordinated operation of a mechanical mechanism consisting of a cam plate, arm plate, swing plate, and motion-limiting components, successfully transforming the single rotational motion of the AC motor into the positioning and switching actions required by the laser welding machine in three-dimensional space. This design not only significantly reduces the initial purchase cost of the equipment but also significantly improves reliability under harsh working conditions at bridge and road construction sites due to the use of environmentally adaptable ordinary motors and mechanical transmissions. It avoids the drawbacks of servo systems being susceptible to dust and temperature fluctuations, as well as the cumbersome debugging and difficult troubleshooting. This achieves dual optimization of equipment purchase and maintenance costs while meeting the welding process requirements of web joints, powerfully promoting the development of laser welding technology in the steel structure manufacturing field.

[0018] 2. This invention utilizes the combined motion of a cam disc and a motion-limiting component. Because the cam disc has a closed annular cam groove with varying radius, when driven to rotate at a constant speed by an AC motor, the cam groove drives the arm plate to oscillate at varying speeds via the first ring. This, in turn, drives the oscillating plate to oscillate back and forth around the follower shaft via a connecting rod. Simultaneously, the linkage plate, hinged to the inner end of the output shaft, is constrained by the first strip-shaped through slot on the plate frame. Combined with the guiding action of the arc-shaped rail plate and the third ring, this forms the motion-limiting component. This component forcibly converts the reciprocating oscillation of the oscillating plate into an intermittent rotational motion where the output shaft precisely rotates 90° with each oscillation, thereby driving the mounting plate and laser welding machine to periodically switch between two parallel web joints. This design utilizes a single power source and mechanical linkage to achieve the welding angle switching problem of the welding head, avoiding the complexity and high cost associated with multi-axis control systems.

[0019] 3. The gantry frame of this invention has a passageway at its bottom, which can cooperate with the conveyor roller table to realize continuous or segmented conveying of I-beams, improving the continuity of the operation process. A suspension frame is fixedly installed on the plate frame, which is equipped with a vision sensor to monitor the weld position and welding quality in real time, and feeds back the collected image signals to the programmable logic controller in the control box. The control system then fine-tunes the speed of the AC motor and corrects the power output of the laser welding machine in real time, thereby effectively compensating for possible errors in mechanical transmission and workpiece positioning deviations, ensuring that the welding head is always accurately aligned with the weld and maintaining a stable weld penetration and formation. In addition, the control box integrates operation and display functions and is equipped with a multi-light warning device to facilitate on-site personnel to monitor the equipment status. Each moving part is designed with a lubrication structure, which enhances the durability and maintainability of the equipment, so that the entire system can achieve automated welding while taking into account the ease of operation and environmental adaptability. Attached Figure Description

[0020] To more clearly illustrate the technical solution of the present invention, the drawings used in the description 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. Figure 1 This is a schematic diagram of the front structure of the overall device of the present invention; Figure 2 This is a schematic diagram of the overall rear structure of the device according to the present invention; Figure 3 This is a schematic diagram of the plate frame structure of the present invention; Figure 4 This is a schematic diagram of the arm plate mounting structure of the present invention; Figure 5 This is a schematic diagram of the cam disk structure of the present invention; Figure 6 This is a schematic diagram of the linkage plate mounting structure of the present invention; Figure 7 This is a schematic diagram of the swing plate mounting structure of the present invention; Figure 8 This is a schematic diagram of the control box structure of the present invention; In the diagram: 1. Gantry frame, 2. Plate frame, 3. Drive shaft, 4. Follower shaft, 5. Cam plate, 6. Swing plate, 7. Arm plate, 8. Bushing, 9. Output shaft, 10. Limiting assembly, 1001. Linkage plate, 1002. Second connecting rod, 1003. Second ring, 1004. First slotted groove, 1005. Arc-shaped rail plate, 1006. Second slotted groove, 1007. Third connecting rod, 1008. Third ring, 11. Mounting plate, 12. Laser welding machine, 13. Motor carrier, 1 4. AC motor; 15. Cam groove; 1501. First circular groove; 1502. Second circular groove; 16. Central bearing shaft; 17. First connector rod; 18. First ring; 19. Connecting rod; 20. Clamping plate; 21. Travel area; 22. Control box; 23. Power switch; 24. Emergency stop switch; 25. Reset button; 26. Shutter control button; 27. Progress display screen; 28. Parameter display screen; 29. ​​Multi-lamp warning device; 30. Suspension frame; 31. Wiring hole; 32. Vision sensor. Detailed Implementation

[0021] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] This specific embodiment provides a welding device for web joints in bridge and road construction, such as... Figures 1-8 As shown, the system includes a gantry frame 1, which serves as the load-bearing foundation for the entire equipment. It is constructed from high-strength structural steel and possesses sufficient rigidity and stability. A plate frame 2 is fixedly installed on one side of the top of the gantry frame 1. Ear plate structures are provided on both sides of the plate frame 2, which are bolted to the gantry frame 1, thus securing the plate frame 2 to the gantry frame 1 and forming a stable assembly structure. A passageway 21 is provided at the bottom of the gantry frame 1. This passageway 21 is used to place a conveyor roller table for transporting I-beams. The passageway 21 is located directly below the plate frame 2 (described later), allowing the I-beams to be welded to pass longitudinally through the gantry frame 1, enabling continuous or segmented welding operations. The height and width of the passageway 21 are designed according to the specifications of common I-beams to accommodate the passage requirements of various large I-beams in road and bridge construction.

[0023] The drive shaft 3 and follower shaft 4 are installed inside the plate frame 2. The drive shaft 3 and follower shaft 4 are rotatably engaged with the plate frame 2 by means of ball bearings. A cam disk 5 and a swing plate 6 are respectively fastened to the periphery of the drive shaft 3 and follower shaft 4. The cam disk 5 and swing plate 6 are both arranged on the front side of the plate frame 2. A motor carrier 13 is fixedly installed on the gantry frame 1. The motor carrier 13 is arranged on the rear side of the plate frame 2. An AC motor 14 is stably installed on the motor carrier 13. The AC motor 14 is the main power source of this equipment. The AC motor 14 is a common three-phase asynchronous motor, which has the advantages of low cost, good environmental adaptability and simple maintenance compared with servo motors. The output shaft of the AC motor 14 can be connected to the drive shaft 3 through a coupling. When the AC motor 14 starts, it drives the drive shaft 3 and the cam disk 5 to rotate continuously.

[0024] A central bearing shaft 16 is installed inside the plate frame 2. The central bearing shaft 16 is arranged between the drive shaft 3 and the follower shaft 4, and can rotate with the plate frame 2 by installing a ball bearing. An arm plate 7 is fastened to the periphery of the central bearing shaft 16, and the arm plate 7 is arranged on the front side of the plate frame 2. The arm plate 7 has an L-shaped structure, and the central bearing shaft 16 is arranged in the middle of the arm plate 7. A first insertion rod 17 is fixedly installed at the shorter end of the L-shape of the swing plate 6, and a first ring 18 is rotatably installed at the inner end of the first insertion rod 17.

[0025] The cam disk 5 has a cam groove 15, which is a closed annular groove, including a first arc groove portion 1501 and a second arc groove portion 1502. The first arc groove portion 1501 and the second arc groove portion 1502 are smoothly connected to form a continuous trajectory. The radius of the first arc groove portion 1501 is larger than that of the second arc groove portion 1502; this difference in radius is designed to achieve speed changes and position switching during subsequent movements. The first ring 18 is arranged in the cam groove 15 of the cam disk 5 and slides with it. The first ring 18 is made of wear-resistant material and its surface in contact with the cam groove 15 is lubricated to reduce friction and wear. When the cam disk 5 rotates, the cam groove 15 drives the first ring 18 to move along the groove, thereby driving the arm plate 7 to rotate along the central bearing shaft 16.

[0026] A connecting rod 19 is provided between the swing plate 6 and the arm plate 7. Both ends of the connecting rod 19 are fitted with fisheye connectors, and each fisheye connector contains a spherical bearing. One end of the connecting rod 19 can be hinged to the longer L-shaped end of the swing plate 6 via the spherical bearing. A clamping plate 20 is fixedly installed around the periphery of the swing plate 6, and the other end of the connecting rod 19 can be hinged to the clamping plate 20 via the spherical bearing. Thus, the rotational motion of the cam disc 5 can be converted into the swinging motion of the arm plate 7, which is then transmitted to the swing plate 6 via the connecting rod 19, driving the swing plate 6 to reciprocate around the follower shaft 4.

[0027] A bushing 8 is fixedly mounted on the swing plate 6, and the bushing 8 is perpendicular to the surface of the swing plate 6. The bushing 8 is located at the end furthest from the follower shaft 4, and its axis is parallel to the axis of the follower shaft 4. An output shaft 9 is disposed inside the bushing 8, passing through the bushing 8, with both ends extending outside the bushing 8. A rolling bearing is installed between the output shaft 9 and the bushing 8 to ensure flexible rotation and minimize radial clearance.

[0028] A limiting assembly 10 is installed on the inner end (i.e., the end facing the interior of the plate frame 2) of the swing plate 6 and the output shaft 9. This limiting assembly 10 limits the rotation angle of the output shaft 9; specifically, it limits the intermittent reciprocating rotation of the mounting plate 11 (described later) around the axis of the output shaft 9 by 90°. The mounting plate 11 is securely fitted onto the outer end (i.e., the end away from the plate frame 2) of the output shaft 9. The mounting plate 11 is made of lightweight, high-strength material, primarily aluminum alloy, to reduce moment of inertia. A laser welding machine 12 is fixedly installed on the outer side of the mounting plate 11, with its welding head facing downwards and aligned with the web joint of the I-beam to be welded. The welding head of the laser welding machine 12 is preferably a telescopic structure, automatically adjusting its extension length according to the web height to accommodate I-beams of different specifications.

[0029] The specific structure of the limiting component 10 is as follows. The limiting component 10 includes a linkage plate 1001 hinged to the inner end of the output shaft 9. The linkage plate 1001 is arranged in the space between the plate frame 2 and the swing plate 6. A second insertion rod 1002 is fixedly installed on the linkage plate 1001, and the second insertion rod 1002 extends perpendicularly to the plate surface of the linkage plate 1001. A second ring 1003 is rotatably installed at the inner end of the second insertion rod 1002. A first strip-shaped through groove 1004 is obliquely arranged on the plate frame 2. The first strip-shaped through groove 1004 makes an angle of 45° with the horizontal direction. The second ring 1003 is arranged in the first strip-shaped through groove 1004 and slides with it. When the swing plate 6 swings, it drives the linkage plate 1001 to move, and the second ring 1003 slides in the first strip-shaped through groove 1004, thereby constraining the rotation of the output shaft 9.

[0030] The limiting component 10 also includes an arc-shaped rail plate 1005, which is arranged on the outside of the swing plate 6 and on the inside of the connecting rod 19. Both ends of the swing plate 6 are fastened to the plate frame 2. The arc-shaped rail plate 1005 is arc-shaped. A second strip-shaped through groove 1006 is provided in the swing plate 6. The second strip-shaped through groove 1006 extends along the length direction of the swing plate 6. A third plug-in rod 1007 is fixedly installed in the second strip-shaped through groove 1006. The third plug-in rod 1007 is perpendicular to the axis of the follower shaft 4. A third ring 1008 is rotatably installed on the periphery of the third plug-in rod 1007. The outer wall of the third ring 1008 slides in cooperation with the inner side of the arc-shaped rail plate 1005. The arc-shaped track plate 1005 and the third ring 1008 work together to guide the swing plate 6 to maintain a stable posture during the swing process, and work together with the linkage plate 1001 to constrain the motion trajectory of the output shaft rod 9, so that the output shaft rod 9 reciprocates intermittently when the swing plate 6 completes one swing.

[0031] The design principle of the aforementioned limiting component 10 is as follows: when the swing plate 6 swings, the arc-shaped rail plate 1005 and the third ring 1008 guide the swing plate 6 to move along a predetermined trajectory; at the same time, the linkage plate 1001 is constrained by the first strip-shaped through groove 1004, and its movement trajectory is limited to a 45° oblique straight line movement. Since the linkage plate 1001 is hinged to the output shaft 9, the movement of the output shaft 9 is determined by the swing of the swing plate 6 and the constraint of the linkage plate 1001, ultimately realizing the intermittent rotational movement of the output shaft 9, which rotates 90° with each swing during the swing process, thereby enabling the welding head of the laser welding machine 12 to automatically switch between the two parallel seams of the I-beam web.

[0032] For ease of operation and control, a control box 22 is fixedly installed on the outer side of the frame 2. The control box 22 features a sealed structure design, providing dust and water resistance, and is suitable for the harsh environment of road and bridge construction sites. The control box 22 includes an operating area and a display area. The operating area is equipped with a power switch 23, an emergency stop switch 24, a reset button 25, and a shutter control button 26, facilitating start-up, shutdown, reset, and laser control by the operator. The display area includes a progress display screen 27 and a parameter display screen 28, used to display welding progress, equipment status, and key process parameters in real time. The control box 22 contains a programmable logic controller (PLC) that receives signals from various sensors and controls the start-up, shutdown, and speed of the AC motor 14, as well as the power output of the laser welding machine 12.

[0033] The top of the control box 22 is equipped with a multi-light warning device 29, which includes indicator lights of different colors (such as red, yellow, and green) to correspond to different operating states of the equipment: green indicates normal operation, yellow indicates standby or ready, and red indicates a fault alarm. The multi-light warning device 29 helps on-site operators to understand the equipment status remotely, improving operational safety.

[0034] To improve welding quality and automation, a suspension frame 30 is fixedly installed on the inner side of the plate frame 2, and the suspension frame 30 is located on the rear side of the plate frame 2. Multiple wire-passing holes 31 are arranged on the plate frame 2 above the suspension frame 30 for threading and organizing power cables, signal cables, and other conduits, preventing messy tangles from affecting the normal operation of moving parts.

[0035] A vision sensor 32 is fixedly installed inside the suspension frame 30, with its head facing downwards and aligned with the welding area below. The vision sensor 32 employs an industrial-grade CCD camera and a laser contour sensor to monitor the weld position, track the weld trajectory, and detect the weld formation quality in real time. The image signals collected by the vision sensor 32 are transmitted to a PLC or dedicated image processing unit in the control box 22. After analysis and processing, the speed of the AC motor 14 can be fine-tuned, or the welding parameters of the laser welding machine 12 can be corrected in real time, achieving closed-loop control and ensuring welding accuracy.

[0036] In addition, to extend the service life of the equipment, grease filling ports are provided at the hinge points and sliding surfaces of all moving parts, facilitating regular grease application and reducing friction and wear. The equipment adopts a modular design, with all components connected by bolts, facilitating on-site disassembly and maintenance.

[0037] The working principle of this invention is as follows: Step 1: Preparation. Adjust the position of the gantry frame 1 according to the specifications of the I-beam to be welded, ensuring the conveyor rollers pass through the passage area 21 of the gantry frame 1. Check that all moving parts are flexible and properly lubricated. Connect the power supply and start the equipment using the power switch 23 on the control box 22. Observe whether the multi-light warning device 29 displays a normal status.

[0038] The second step is to place the workpiece. The I-beam to be welded is hoisted onto the conveyor roller table, and its position is adjusted so that the two longitudinal joints of its web are within the movement trajectory of the laser welding machine's 12 welding heads. Initial positioning can be done manually or with an auxiliary positioning device.

[0039] The third step is parameter setting. Welding process parameters, including laser power, welding speed, and oscillation frequency, are set via the operating area on the control box 22. The parameter display screen 28 shows the current settings, which the operator can adjust according to process requirements. Simultaneously, the vision sensor 32 automatically performs initial weld seam identification and feeds the data back to the control system.

[0040] Step 4: Start welding. Turn on the power switch 23, and the AC motor 14 starts to rotate, driving the drive shaft 3 and the cam plate 5 to rotate. The cam groove 15 drives the arm plate 7 to swing around the central bearing shaft 16 through the first ring 18. The swing of the arm plate 7 is transmitted to the swing plate 6 through the connecting rod 19, causing the swing plate 6 to swing back and forth around the follower shaft 4.

[0041] Step 5: Welding head switching and welding. During the swinging process of the swing plate 6, the limiting component 10 plays a role: the linkage plate 1001 is constrained by the first strip-shaped through groove 1004, and with the guidance of the arc-shaped rail plate 1005 and the third ring 1008, the output shaft 9 generates an intermittent rotation of 90° with each swing. Specifically, when the swing plate 6 swings in one direction, the output shaft 9 drives the mounting plate 11 and the laser welding machine 12 to rotate 90°, so that the welding head of the laser welding machine 12 is aligned with the first web joint, the AC motor 14 stops rotating, and the conveying roller table continues to convey the I-beam, thereby performing welding operations on its first web joint; after the AC motor 14 is restarted, the swing plate 6 swings back, and the output shaft 9 rotates 90° again, so that the welding head switches to the second web joint and moves along the second joint to perform welding. This achieves alternating welding of the two joints.

[0042] Step 6: Real-time monitoring and adjustment. During the welding process, the vision sensor 32 continuously acquires weld images, detecting the weld position and welding quality in real time. If weld misalignment or poor formation is detected, the control system automatically adjusts the speed of the AC motor 14 or the power of the laser welding machine 12 to ensure the welding quality meets requirements. The progress display screen 27 shows the welding progress in real time, allowing operators to monitor the operation.

[0043] Step 7: Complete welding. Once both seams of the web of the I-beam are welded, the control system automatically stops the AC motor 14 and the laser welding machine 12, and the multi-light warning device 29 issues a completion notification (e.g., a flashing green light). The operator presses the emergency stop switch 24 and the reset button 25 to reset the equipment. Then, the welded I-beam is moved away from the welding area by the conveyor rollers and flipped over by the hoisting equipment to begin welding the two web seams on the other side of the I-beam.

[0044] Step 8: Equipment Maintenance. After the operation is completed, turn off the power switch 23, clean the welding slag and dust from the equipment surface, lubricate and maintain all moving parts, check the wear of vulnerable parts, and replace severely worn parts in a timely manner to ensure long-term stable operation of the equipment.

[0045] In summary, the web joint welding equipment for bridge and road construction of the present invention, driven by a single AC motor 14 and coupled with a mechanical transmission mechanism consisting of a cam disc 5, a boom plate 7, a swing plate 6, and a limiting component 10, achieves automatic switching welding between two parallel joints of the web of an I-beam by a laser welding machine 12. This equipment completely eliminates the need for multiple servo motors, high-precision linear guides, and complex control systems required by traditional three-axis machine tools, significantly reducing equipment procurement costs and maintenance difficulty. Simultaneously, closed-loop control is achieved using a vision sensor 32, ensuring welding accuracy and stability. This equipment features a simple structure, reliable operation, and low cost, making it particularly suitable for batch welding operations of large I-beams in bridge and road construction, and possesses significant potential for widespread application.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A welding device for web joints in bridge and road construction, comprising a gantry (1), characterized in that, A plate frame (2) is fixedly installed on one side of the top of the gantry frame (1). A drive shaft (3) and a follower shaft (4) with rotational engagement are installed inside the plate frame (2). A cam plate (5) and a swing plate (6) are respectively fastened to the periphery of the drive shaft (3) and the follower shaft (4). A transmission engagement arm plate (7) is loaded between the cam plate (5) and the swing plate (6). A bushing (8) is fixedly installed on the swing plate (6). An output shaft (9) with rotational engagement is provided inside the bushing (8). A limiting component (10) is installed at the inner end of the swing plate (6) and the output shaft (9). A mounting plate (11) is fastened to the outer end of the output shaft (9). The limiting component (10) is used to limit the transmission mounting plate (11) to rotate 90° around the axis of the output shaft (9). A laser welding machine (12) is fixedly installed on the outer side of the mounting plate (11).

2. The web joint welding equipment for bridge and road construction according to claim 1, characterized in that, A motor carrier (13) is fixedly installed on the gantry frame (1), and an AC motor (14) is stably installed on the motor carrier (13). The output shaft of the AC motor (14) is connected to the drive shaft rod (3) for transmission.

3. The web joint welding equipment for bridge and road construction according to claim 1, characterized in that, The cam disk (5) has a cam groove (15) inside. The arm plate (7) has an L-shaped structure. The middle of the arm plate (7) is fastened with a central bearing shaft (16). The central bearing shaft (16) can rotate with the plate frame (2). One end of the swing plate (6) is fixedly installed with a first plug rod (17). The inner end of the first plug rod (17) is rotatably installed with a first ring (18). The first ring (18) is arranged in the cam groove (15) and slides with it. The other end of the arm plate (7) is hinged with a connecting rod (19). The swing plate (6) is installed with a clamping plate (20). The clamping plate (20) is hinged with the connecting rod (19).

4. The web joint welding equipment for bridge and road construction according to claim 3, characterized in that, The cam groove (15) includes a first circular groove portion (1501) and a second circular groove portion (1502). The first circular groove portion (1501) and the second circular groove portion (1502) are smoothly connected. The radius of the arc of the first circular groove portion (1501) is larger than the radius of the arc of the second circular groove portion (1502).

5. The web joint welding equipment for bridge and road construction according to claim 1, characterized in that, The limiting component (10) includes a linkage plate (1001) hinged to the inner end of the output shaft rod (9). The linkage plate (1001) is arranged between the plate frame (2) and the swing plate (6). A second plug rod (1002) is fixedly installed on the linkage plate (1001). A second ring (1003) is rotatably installed on the inner end of the second plug rod (1002). A first strip-shaped through groove (1004) is opened on the plate frame (2) and the second ring (1003) is arranged in the first strip-shaped through groove (1004) and slides in cooperation with it.

6. The web joint welding equipment for bridge and road construction according to claim 5, characterized in that, The first strip groove (1004) has an angle of 45° with the horizontal direction.

7. The web joint welding equipment for bridge and road construction according to claim 1, characterized in that, The limiting component (10) also includes an arc-shaped rail plate (1005), which is arranged on the outside of the swing plate (6) and fastened to the plate frame (2). A second strip-shaped through groove (1006) is provided in the swing plate (6), and a third plug rod (1007) is fixedly installed in the second strip-shaped through groove (1006). A third ring (1008) is rotatably installed on the periphery of the third plug rod (1007), and the outer wall of the third ring (1008) can slide with the inner side of the arc-shaped rail plate (1005).

8. The web joint welding equipment for bridge and road construction according to claim 1, characterized in that, The bottom of the gantry (1) is provided with a passage area (21) to facilitate the passage of the I-beam. The passage area (21) is arranged below the plate frame (2). The welding head of the laser welding machine (12) is a telescopic structure.

9. The web joint welding equipment for bridge and road construction according to claim 1, characterized in that, A control box (22) is fixedly installed on the outside of the frame (2). The control box (22) is provided with an operation area and a display area. The operation area is provided with a power switch (23), an emergency stop switch (24), a reset button (25), and a shutter control button (26). The display area is provided with a process display screen (27) and a parameter display screen (28). A multi-lamp warning device (29) is installed on the top of the control box (22).

10. The welding equipment for web joints in bridge construction according to claim 1, characterized in that, A suspension frame (30) is fixedly installed on the inner side of the plate frame (2), and a plurality of wire holes (31) arranged on the plate frame (2) are provided above the suspension frame (30). A vision sensor (32) is fixedly installed inside the suspension frame (30), and the head of the vision sensor (32) is arranged downward.

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