A portable welding device for building construction

Abstract

This invention discloses a portable welding device for construction applications, comprising a pair of interlocking mobile carts. A guide beam is installed in the mobile cart, and a welding table is slidably connected to the guide beam and connected to a welding torch. An electrical distributor and battery within the mobile carts supply power to the welding table via cables or data transmission lines within the guide beams. The mobile carts are equipped with a fixed frame containing a C-frame, a U-frame, and clamping rods, as well as a rotating clamping device. An inclination sensor is installed on the C-frame to monitor the levelness and ensure the surface of the mobile cart is level. During welding, the fixed frame supports the workpiece, and the rotating clamping device rotates tubular or regular cross-section workpieces to achieve continuous welding. Its portability is reflected in its convenient storage function; the guide beam can be stored in the mobile cart, and the welding table can be detached or clipped for storage, facilitating transportation and on-site deployment. It is suitable for the complex environments of construction sites and easily achieves efficient and stable welding operations.

Description

Technical Field

[0001] This invention relates to the field of welding equipment, and in particular to a portable welding device for building construction. Background Technology

[0002] Existing welding equipment used in building construction mainly includes types such as electric arc welding, gas shielded welding, and resistance welding. Manual electric arc welding equipment uses welding rods as electrodes, is flexible in operation, and is suitable for welding in multiple positions such as rebar connections and steel structure joints; submerged arc welding equipment has a high degree of automation, large welding current, and high efficiency, and is often used for splicing long welds in large steel structures.

[0003] Chinese invention CN118720564A discloses a steel structure welding device for building construction. The device uses a climbing mechanism to pull the welding mechanism up and down on the vertical support column of the steel structure building, thereby bringing the welding mechanism to the weld. Then, the welding mechanism is transmitted to the display screen in real time via a camera. Construction personnel can control the welding mechanism according to the image on the display screen to realize automated welding operation.

[0004] Chinese invention CN114406517A discloses a steel mesh welding equipment and welding method for building construction. The beneficial effect of this invention is that the bottom of the transverse steel bars also contacts the longitudinal steel bars. In conjunction with the welding of the welding head, the transverse steel bars are placed using the longitudinal steel bars to determine the welding height, thereby achieving the effect of adjusting the welding position by utilizing the height of the longitudinal steel bars.

[0005] In the current construction engineering field, the widely used welding equipment is not portable. Traditional welding equipment is often bulky and heavy, making it inconvenient for construction workers to move and operate flexibly in confined spaces. Existing equipment has poor adaptability, with limited workpiece fixing range and adaptability to different types of workpieces, making it difficult to adapt to welding different types and lengths of workpieces, which directly affects welding quality and construction efficiency. Summary of the Invention

[0006] The core of this invention lies in its portable structural design, which integrates a retractable guide beam and a detachable welding table. Combined with tilt sensor-based horizontal monitoring, workpiece support via a fixed frame, and continuous welding functionality via a rotating clamping device, it addresses the shortcomings of existing welding equipment used in construction, such as insufficient portability, poor adaptability to complex environments, and low welding stability. Simultaneously, it achieves efficient and stable welding operation and intelligent working mode switching, meeting the needs of dispersed locations and long-distance, high-precision welding on construction sites.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A portable welding device for building construction includes a pair of interlocking mobile carts, a welding table between the pair of mobile carts, a guide beam between the pair of mobile carts, one end of the guide beam being slidably inserted into one of the mobile carts, the other end of the guide beam being connected to a butt joint, and a butt seat matching the butt joint being hinged on the other mobile cart.

[0009] The welding table is slidably connected to the guide beam. A welding feed module is installed inside the welding table, and a welding gun is connected to the welding table via a flexible hose. A power distributor and a battery are installed inside the mobile vehicle, and a data transmission line electrically connected to the power distributor is threaded through the guide beam. A cable is detachably connected between the welding table and the power distributor, and a pair of connectors matching the cable are connected to the lower end of the welding table.

[0010] A fixed frame is detachably connected to the upper surface of one end of a pair of mobile vehicles that are close to each other. The fixed frame includes a C-shaped frame, and a U-shaped frame is detachably connected to the C-shaped frame. The U-shaped frame has a pair of oblique screw holes and a straight screw hole that matches the disassembly and assembly hole. A clamping rod is detachably connected to the oblique screw hole and the straight screw hole. A support member is detachably connected to the top of the clamping rod. An tilt sensor is fixedly connected to the outer wall of the C-shaped frame. A disassembly and assembly hole for installing the support member is opened in the middle of the C-shaped frame.

[0011] The end of the mobile vehicle away from the fixed frame is connected to a rotary clamping device, which includes an electric motor. A turntable is fixedly connected to the power output end of the electric motor, and two pairs of electric grippers are connected to the turntable.

[0012] Furthermore, a laser transmitter is mounted on one C-frame, and a laser rangefinder and a laser receiver matched with the laser transmitter are mounted on another C-frame.

[0013] Furthermore, a lifting device connects the C-frame to the mobile vehicle, and a placement platform is provided on the upper surface of the C-frame, with assembly / disassembly holes penetrating the placement platform and the C-frame.

[0014] Furthermore, the mobile vehicle includes a mobile box, on which a worktable for mounting a fixing frame and a rotating clamping device is fixedly connected, and two pairs of adjustable feet are connected to the lower end of the mobile box.

[0015] Furthermore, a displacement sensor is installed inside the welding station, and a control switch and zeroing button that match the displacement sensor are installed on the welding station.

[0016] Furthermore, the bottom of the welding table is connected to a telescopic bracket, and a wind-cooling device is installed inside the welding table. An air outlet matching the wind-cooling device is provided at the end of the welding table away from the guide beam.

[0017] Furthermore, the mobile vehicle is equipped with slide rails that match the rotary clamping device, with the rotary clamping device positioned at the two ends of the slide rails, one away from and one close to the fixed frame.

[0018] Furthermore, it also includes an auxiliary welding system, which comprises a data acquisition module, a control module, and a display module;

[0019] The data acquisition module is used to collect monitoring data from various sensors;

[0020] The control module is used to control the power distribution unit to distribute power and to determine whether a pair of mobile vehicles work synchronously; the control module has an independent working mode and a synchronous working mode.

[0021] The display module is used to display error information.

[0022] Furthermore, when both mobile carriages are connected to the welding table via cables or electrically via guide beams, they are set to synchronous working mode. Before operation, the tilt sensor is used to detect whether both mobile carriages are on a horizontal plane. If so, the laser emitter and laser receiver are used to detect whether a pair of fixed frames are matched. After the detection is passed, the synchronous working mode is set. In synchronous working mode, a pair of rotating clamping devices work synchronously.

[0023] Furthermore, when the docking joint is separated from the docking seat and the welding table is not simultaneously connected to the two mobile vehicles with cables, it is set to independent working mode; in independent working mode, the rotating clamping devices on the mobile vehicles are controlled independently.

[0024] Compared with the prior art, the advantages of this invention are:

[0025] (1) This solution monitors the levelness through an inclination sensor to ensure that the surface of the mobile vehicle is level. During the welding process, the fixed frame supports the workpiece, and the rotating clamping device rotates the tubular or regular cross-section workpiece to achieve continuous welding. Its portability is reflected in its convenient storage function. The guide beam can be stored in the mobile vehicle, and the welding table can be disassembled or snapped for storage, which is convenient for transportation and on-site deployment. It is suitable for the complex environment of construction sites and is easy to achieve efficient and stable welding operations.

[0026] (2) It can realize intelligent switching and collaborative control of mobile working mode; when the equipment is working in a narrow space or scattered locations, the independent working mode gives a single mobile vehicle and the corresponding rotating clamping device autonomous working ability, significantly improving the flexibility of equipment layout; while in scenarios such as long-distance, high-precision butt welding, the synchronous working mode ensures that a pair of fixed frames are accurately aligned through the dual verification of tilt sensor and laser positioning system. Attached Figure Description

[0027] Figure 1 This is a perspective view of the workpiece to be welded in this invention.

[0028] Figure 2 This is a perspective view of the welding station of the present invention in its stored state when it is not removed.

[0029] Figure 3 This is a cross-sectional view of the workpiece to be welded in accordance with the present invention.

[0030] Figure 4 for Figure 3 Schematic diagram of the structure at point A;

[0031] Figure 5 This is a side sectional view of the tubular workpiece being fixed according to the present invention;

[0032] Figure 6 This is a cross-sectional view of the single mobile vehicle working in conjunction with the welding table in the independent working mode of the present invention.

[0033] Figure 7 This is a perspective view of the mobile cart in its storage state after the welding table of the present invention has been removed;

[0034] Figure 8 This is a system block diagram of the present invention.

[0035] Explanation of the labels in the diagram:

[0036] 1. Moving vehicle; 11. Guide beam; 12. Butt joint; 13. Butt seat; 2. Welding table; 3. Fixing frame; 31. C-shaped frame; 311. Laser emitter; 32. U-shaped frame; 33. Clamping rod; 4. Rotary clamping device; 41. Electric motor; 42. Turntable; 43. Electric gripper. Detailed Implementation

[0037] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0038] First implementation method:

[0039] Please see Figures 1-7 A portable welding device for construction includes a pair of interlocking mobile carts 1, with a welding table 2 between the pair of mobile carts 1. Each mobile cart 1 includes a mobile box, on which a workbench for mounting a mounting bracket 3 and a rotating clamping device 4 is fixedly connected. The lower end of the mobile box is connected to two pairs of adjustable feet for leveling the mobile cart 1.

[0040] A guide beam 11 is provided between a pair of mobile vehicles 1. One end of the guide beam 11 is slidably inserted into a mobile vehicle 1. The guide beam 11 can be completely retracted into a mobile vehicle 1. The guide beam 11 has a rectangular cross section and its upper surface is parallel to the upper surface of the mobile vehicle 1. The other end of the guide beam 11 is connected to a docking joint 12. A docking seat 13 that matches the docking joint 12 is hinged on the other mobile vehicle 1.

[0041] Welding table 2 is slidably connected to guide beam 11. Welding supply module is installed inside welding table 2. Welding gun is connected to welding table 2 through hose. Power distributor and battery are installed inside mobile vehicle 1. Data transmission line electrically connected to power distributor is passed through guide beam 11. Docking seat 13 and docking joint 12 are electrically connected to two power distributors respectively.

[0042] The welding station 2 is detachably connected to the power distributor by a cable (the specific method of detachable connection shall be set by those skilled in the art according to the actual situation, including but not limited to existing detachable installation methods such as buckles and connectors). The cable includes a data cable and a power supply cable. A pair of connectors matching the cable are connected to the lower end of the welding station 2. A power distribution control unit is provided inside the welding station 2. When the welding station 2 is connected to the power distributor in the two mobile vehicles 1, the power distribution control unit selects the priority power supply. After the power distribution control unit is connected to the two cables, the data transmission connection between the mobile vehicle 1 and the welding station 2 is successfully established.

[0043] A fixed frame 3 is detachably connected to the upper surface of one end of a pair of mobile vehicles 1 that are close to each other. The fixed frame 3 includes a C-shaped frame 31. A lifting device is connected between the C-shaped frame 31 and the mobile vehicle 1. The fixed end of the lifting device is installed inside the mobile vehicle 1, and the telescopic end of the lifting device extends to the upper side of the mobile vehicle 1. A placement platform is provided on the upper surface of the C-shaped frame 31, and a disassembly hole penetrates the placement platform and the C-shaped frame 31.

[0044] A U-shaped frame 32 is detachably connected to the C-shaped frame 31. A retaining strip is connected to the inner wall of the C-shaped frame 31. A strip groove matching the retaining strip is opened on the U-shaped frame 32. Fixing holes are evenly distributed at both ends of the U-shaped frame 32. Fixing bolts that can be inserted into the fixing holes are threaded to both ends of the C-shaped frame 31.

[0045] The top of the U-shaped bracket 32 ​​has a pair of oblique threaded holes and a straight threaded hole that matches the disassembly / assembly hole. The disassembly / assembly hole and the straight threaded hole are coaxially matched. A clamping rod 33 is detachably connected to the oblique threaded hole and the straight threaded hole. The clamping rod 33 can be threaded to both the oblique threaded hole and the straight threaded hole. The oblique threaded hole is used to install the clamping rod 33 at an angle to fix the workpiece whose upper surface is not planar (e.g., Figure 5 (The tubular workpiece shown); the straight threaded hole is used to vertically mount the clamping rod 33 to fix the workpiece whose upper surface is flat;

[0046] The top of the clamping rod 33 is detachably connected to a support member, and an inclination sensor is fixedly connected to the outer wall of the C-frame 31 (the inclination sensor adopts existing technology, and a suitable sensor in the existing technology is selected and installed by a person skilled in the art). When the mobile vehicle 1 is located on a slope, the C-frame 31 will tilt, and the tilt sensor will detect whether the C-frame 31 is tilted.

[0047] The C-frame 31 has a disassembly hole in the middle for installing support components; if the size of the workpiece to be welded changes, it can be quickly adapted by replacing the support components of the clamping rod 33. For example, for irregularly shaped workpieces, an adjustable angle universal support component can be selected to further improve welding stability.

[0048] The end of the mobile carriage 1 away from the fixed frame 3 is connected to a rotating clamping device 4. The rotating clamping device 4 includes a motor 41. A turntable 42 is fixedly connected to the power output end of the motor 41. Two pairs of electric grippers 43 are connected to the turntable 42. The mobile carriage 1 is equipped with a slide rail that matches the rotating clamping device 4. The housing of the motor 41 is slidably connected to the slide rail. When the rotating clamping device 4 is located at both ends of the slide rail, it is away from and close to the fixed frame 3 respectively. The motor 41 is connected to the power distributor by a flexible wire.

[0049] A displacement sensor is installed inside the welding table 2. A control switch and a zeroing button that match the displacement sensor are installed on the welding table 2. The welding table 2 is installed on the guide beam 11 and is attached to a moving car 1. The control switch is turned on and the zeroing button is used to zero the displacement sensor. When the welding table 2 moves along the guide beam 11;

[0050] The bottom of the welding table 2 is connected to a telescopic bracket. A cooling device is installed inside the welding table 2. An air outlet matching the cooling device is provided at the end of the welding table 2 away from the guide beam 11. The air outlet is equipped with a filter screen. The cooling device is used to assist in cooling the weld.

[0051] In use: First, fix a pair of moving carriages 1 to the docking seat 13 by connecting the docking joint 12 of the guide beam 11. Place the workpiece to be welded on the fixed frame 3 and fix it. The tilt sensor assists in calibrating the verticality. At this time, the adjustable foot pins can be adjusted to ensure that the moving carriage 1 is horizontal. When the tilt sensor detects that it is vertical, the workpiece is locked by the clamping rod 33. At this time, the workpiece is locked and fixed. According to the shape of the workpiece to be welded, select the support component for installation to assist in the support of the workpiece. For example, when the workpiece to be welded is a tubular structure, select the support component with a rounded top surface for installation; if the workpiece cross-section is rectangular or regular polygonal, select the support component with a flat top.

[0052] After the welding table 2 is connected to at least one mobile vehicle 1, the cable is connected to the power distribution unit to push the welding table 2 to slide along the guide beam 11 to the starting point. The technician then uses the welding gun connected to the welding table 2 to perform welding.

[0053] If the workpiece needs to rotate during the welding process, before fixing the workpiece, first push the rotating clamping device 4 along the slide rail to the position close to the fixed frame 3, then place the workpiece to be welded on the C-shaped frame 31 driven to rise by the lifting device, and make the end face of the workpiece to be welded fit against the surface of the turntable 42. Then control the electric gripper 43 to clamp the workpiece to be welded. Then, according to the shape of the workpiece to be welded, select a suitable support for installation to assist in the support of the workpiece. For example, when the workpiece to be welded is a tubular structure, select a support with rollers on the top for installation, so that the pipe pile workpiece can be assisted in fixing and ensured to rotate by at least three rollers.

[0054] After the work is completed, turn off the power, load the cables onto welding table 2, and combine a pile of mobile carts 1 so that the guide beam 11 can be stored within one mobile cart 1. Welding table 2 can be detached from the guide beam 11 for separate storage (e.g., Figure 8 (As shown), it can also be clipped onto a pair of mobile carts 1 for storage (such as...) Figure 2 (As shown).

[0055] This solution uses an inclination sensor to monitor the levelness to ensure that the surface of the mobile vehicle 1 is level. During the welding process, the fixed frame 3 supports the workpiece, and the rotating clamping device 4 rotates the tubular or regular cross-section workpiece to achieve continuous welding. Its portability is reflected in its convenient storage function. The guide beam 11 can be stored in the mobile vehicle 1, and the welding table 2 can be detached or snapped for storage, which facilitates transportation and on-site deployment. It is suitable for the complex environment of construction sites and can easily achieve efficient and stable welding operations.

[0056] Adjustable feet ensure the equipment is level, tilt sensors assist in calibrating verticality, and replaceable supports adapt to irregularly shaped workpieces, improving welding accuracy and safety. Meanwhile, the equipment's air-cooling device effectively dissipates heat and prevents overheating damage. The displacement sensor and control switch work together to facilitate precise control of the welding trajectory and avoid errors.

[0057] Second implementation method:

[0058] Please see Figure 2 and Figure 8 The difference between this implementation method and the first implementation method is that:

[0059] A laser transmitter 311 is mounted on one C-frame 31, and a laser rangefinder and a laser receiver matched with the laser transmitter 311 are mounted on another C-frame 31.

[0060] It also includes an auxiliary welding system, which comprises a data acquisition module, a data processing module, a control module, and a display module;

[0061] The data acquisition module is used to collect monitoring data from various sensors; for example:

[0062] Displacement sensing data acquisition: Real-time displacement and position coordinate data of the displacement sensor built into welding station 2 are acquired to provide basic parameters for precise control of welding trajectory;

[0063] Laser sensing data acquisition: signals from laser emitter 311, laser receiver and laser range sensor to acquire data on the length of the workpiece to be welded, the relative distance between the two moving carriages 1 and the positional deviation.

[0064] Inclination sensor data acquisition: Collect verticality monitoring data from the inclination sensor on the outer wall of C-frame 31 to determine whether the longitudinal verticality of the workpiece meets the welding reference requirements;

[0065] The data processing module is used to process and analyze the monitoring data. The analysis results provide a basis for the specific working instructions of the control module. The data processing module is connected to a processor, which is installed in the mobile vehicle 1 that can be retracted into the guide beam 11.

[0066] The control module is used to control the power distribution unit to distribute power and whether the pair of mobile vehicles 1 work synchronously; the control module is set with independent working mode and synchronous working mode;

[0067] During power distribution control, the power distributor allocates power to the welding torch, displacement sensor, rotary clamping device 4 and other equipment as needed according to the welding process and the working status of each module (such as the start of the welding material supply module, the clamping of the electric gripper 43, etc.) to optimize energy consumption.

[0068] Independent working mode: When the docking joint 12 is separated from the docking seat 13 and the welding table 2 is not connected to the two mobile carriages 1 at the same time, it is set to independent working mode; in independent working mode, the rotating clamping device 4 on the mobile carriage 1 is controlled independently; a single mobile carriage operates independently, driving its fixing frame 3, rotating clamping device 4 and welding table 2 to complete the welding operation alone.

[0069] Synchronous working mode: When both mobile carriages 1 are connected to the welding table 2 via cables or electrically via guide beams 11, the synchronous working mode is set. Before operation, the tilt sensor is used to detect whether both mobile carriages 1 are on a horizontal plane. If so, the laser emitter 311 and laser receiver are used to detect whether the pair of fixed frames 3 are matched. After the detection is passed, the synchronous working mode is set. In synchronous working mode, a pair of rotating clamping devices 4 work synchronously to ensure that the clamping of both ends of the workpiece is coordinated with the welding action.

[0070] Anomaly Handling: When anomalies such as excessive verticality or insufficient clamping force are detected, an alarm is triggered and the power supply to non-essential modules is cut off to protect the equipment and the workpiece.

[0071] The display module is used to display real-time parameters, device status, and abnormal conditions.

[0072] The specific parameters displayed include: real-time coordinates of welding table 2, verticality deviation value, laser ranging dimension, clamping force of electric gripper 43, and rotation angle of turntable 42, etc.

[0073] Equipment status displays include, for example: the current working mode (independent / synchronous), power distribution status of the power distributor, and the lifting height of the C-frame 31.

[0074] When abnormal conditions are displayed: abnormal alarm information such as "verticality error" and "clamping not in place" are displayed through text / icons, and adjustment suggestions are provided (such as "level the adjustable feet" and "increase the clamping force").

[0075] This implementation enables intelligent switching and collaborative control of mobile working modes. When the equipment operates in confined spaces or at scattered locations, the independent working mode grants each mobile vehicle 1 and its corresponding rotating clamping device 4 autonomous operating capabilities, significantly improving the flexibility of equipment layout. In scenarios such as long-distance, high-precision butt welding, the synchronous working mode ensures precise alignment of a pair of fixed frames 3 through dual verification by tilt sensors and a laser positioning system, enabling a pair of rotating clamping devices 4 to rotate and weld in strict synchronization, effectively guaranteeing the consistency of the welding trajectory and the accuracy of structural butt welding. The control module's real-time management of the power distribution unit's power supply status, combined with the abnormal information feedback from the display module, further enhances the safety and reliability of equipment operation, thereby meeting the core requirements of complex construction sites for portable welding equipment that is efficient, precise, and highly adaptable.

[0076] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A portable welding device for building construction, comprising a pair of interlocking mobile carts (1), wherein a welding table (2) is provided between the pair of mobile carts (1), characterized in that: A guide beam (11) is provided between a pair of the mobile vehicles (1). One end of the guide beam (11) is slidably inserted into one of the mobile vehicles (1), and the other end of the guide beam (11) is connected to a docking joint (12). A docking seat (13) matching the docking joint (12) is hinged on the other mobile vehicle (1). The welding table (2) is slidably connected to the guide beam (11). A welding material supply module is installed inside the welding table (2). A welding gun is connected to the welding table (2) via a flexible hose. A power distributor and a battery are installed inside the mobile vehicle (1). A data transmission line electrically connected to the power distributor is passed through the guide beam (11). A cable is detachably connected between the welding table (2) and the power distributor. A pair of connectors matching the cable are connected to the lower end of the welding table (2). A fixed frame (3) is detachably connected to the upper surface of one end of the pair of mobile vehicles (1) that are close to each other. The fixed frame (3) includes a C-shaped frame (31). A U-shaped frame (32) is detachably connected to the C-shaped frame (31). A pair of oblique screw holes and a straight screw hole that matches the disassembly hole are provided on the U-shaped frame (32). A clamping rod (33) is detachably connected to the oblique screw hole and the straight screw hole. A support member is detachably connected to the top of the clamping rod (33). An angle sensor is fixedly connected to the outer wall of the C-shaped frame (31). A disassembly hole for installing the support member is provided in the middle of the C-shaped frame (31). The mobile vehicle (1) is connected to a rotating clamping device (4) at one end away from the fixed frame (3). The rotating clamping device (4) includes a motor (41). A turntable (42) is fixedly connected to the power output end of the motor (41). Two pairs of electric grippers (43) are connected to the turntable (42).

2. The portable welding equipment for building construction according to claim 1, characterized in that: A laser transmitter (311) is mounted on one of the C-frames (31), and a laser rangefinder and a laser receiver matched with the laser transmitter (311) are mounted on the other C-frame (31).

3. The portable welding equipment for building construction according to claim 1, characterized in that: A lifting device is connected between the C-shaped frame (31) and the mobile vehicle (1). A placement platform is provided on the upper surface of the C-shaped frame (31), and the disassembly hole passes through the placement platform and the C-shaped frame (31).

4. The portable welding equipment for building construction according to claim 1, characterized in that: The mobile vehicle (1) includes a mobile box, on which a workbench for installing a mounting bracket (3) and a rotating clamping device (4) is fixedly connected. Two pairs of adjustable feet are connected to the lower end of the mobile box.

5. A portable welding device for building construction according to claim 1, characterized in that: A displacement sensor is installed inside the welding table (2), and a control switch and a zeroing button matching the displacement sensor are installed on the welding table (2).

6. A portable welding device for building construction according to claim 1, characterized in that: The bottom end of the welding table (2) is connected to a telescopic bracket. A wind-cooling device is installed inside the welding table (2). An air outlet matching the wind-cooling device is provided at the end of the welding table (2) away from the guide beam (11).

7. A portable welding device for building construction according to claim 1, characterized in that: The mobile vehicle (1) is equipped with a slide rail that matches the rotating clamping device (4). When the rotating clamping device (4) is located at both ends of the slide rail, it is away from and close to the fixed frame (3).

8. A portable welding device for building construction according to claim 1, characterized in that: It also includes an auxiliary welding system, which includes a data acquisition module, a control module, and a display module; The data acquisition module is used to collect monitoring data from various sensors; The control module is used to control the power distribution device to distribute power and whether a pair of mobile vehicles (1) work synchronously; the control module is equipped with an independent working mode and a synchronous working mode; The display module is used to display abnormal information.

9. A portable welding device for building construction according to claim 8, characterized in that: When both of the aforementioned mobile carts (1) are connected to the welding table (2) via cables or electrically via guide beams (11), they are set to synchronous working mode. Before working, the tilt sensor is used to detect whether both mobile carts (1) are on the horizontal plane. If so, the laser emitter (311) and laser receiver are used to detect whether a pair of fixed frames (3) are matched. After the detection is passed, the synchronous working mode is set. In synchronous working mode, a pair of rotating clamping devices (4) work synchronously.

10. A portable welding device for building construction according to claim 8, characterized in that: When the docking joint (12) is separated from the docking seat (13) and the welding table (2) is not connected to the two mobile vehicles (1) by cables at the same time, it is set to independent working mode; in independent working mode, the rotating clamping device (4) on the mobile vehicle (1) is controlled independently.

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