A mobile welding machine operable as a trailer

Abstract

The present application relates to the technical field of welding machine, disclose a kind of mobile welding machine of trailer operation, including the polishing assembly still includes slagging port, and the slagging port is opened in arc seat, by the slagging port is opened in arc seat, can utilize the flow guide surface of arc seat and make the welding slag generated by polishing along arc surface naturally slide and converge to slagging port, to realize the directional collection and concentrated discharge of welding slag, compared with the problem that traditional plane structure is easy to cause welding slag to splash everywhere, accumulation in equipment dead angle is difficult to clean, the present design significantly improves the collection efficiency of welding slag, avoids the interference or scratch workpiece surface caused by welding slag residue to subsequent process.

Description

Background Technology

[0002] This invention relates to the field of welding machine technology, and more specifically to a mobile welding machine that can be towed.

[0003] Generally speaking, mobile welding machines are suitable for outdoor welding operations in situations where there is no fixed work position, complex road conditions, and variable working conditions, such as steel structure construction sites, bridge maintenance, outdoor infrastructure construction, and equipment emergency repair.

[0004] The prior art discloses a high-frequency welding machine for welded pipe processing, with announcement number CN121755851A. This machine uses a three-dimensional radially constrained limiting channel formed by a controlled synchronously moving upper pressure roller and a pair of side pressure rollers. This allows for effective clamping and centering of the pipe blank from multiple directions, eliminating axial movement, radial runout, and circumferential rotation of the pipe blank caused by inertia or vibration during the start-up, operation, and stop of the support platform. This ensures that the relative position of the pipe blank and the high-frequency head remains unchanged, avoiding defects such as bending and irregularities in the weld. Electromagnetic coils are installed in the upper pressure roller, side pressure rollers, and axial auxiliary drive wheel, and a controllable current is provided by the power supply control unit. This allows a strong, directionally controllable external focusing magnetic field to be applied to the welding V-shaped opening area of ​​the pipe blank. This magnetic field significantly enhances the proximity effect of the high-frequency current, forcing the current to flow more tightly along the edge of the pipe blank, resulting in a high concentration of heat at the welding point and reducing heat loss to the base material. This not only significantly improves welding speed and quality and reduces energy consumption but also improves the problem of difficulty in welding thick-walled pipe blanks due to their large heat capacity.

[0005] However, the device still has the following problems: Although the above-mentioned patent (publication number CN121755851A) achieves multi-dimensional constraint on the tube blank and external focusing magnetic field enhancement through structures such as upper pressure roller, side pressure roller and electromagnet coil, effectively improving the quality and efficiency of high-frequency welding, the following technical defects still exist in practical applications: The device only focuses on clamping, centering and magnetic field control during the welding process, and does not set up any mechanism for surface treatment of the weld after welding. During the welding process, after the high-temperature molten metal cools and solidifies, burrs, spatter or uneven weld beads are often formed in the weld area. If they are not ground and repaired in time, it will not only affect the appearance quality of the welded pipe, but may also cause problems such as jamming, stress concentration or poor sealing in subsequent processes (such as pipe threading, coating, assembly), reducing the finished product qualification rate and service life. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a trailer-mountable mobile welding machine. This machine utilizes a centering clamping assembly with opposing double-seat movement and annularly distributed rubber rollers to ensure precise alignment of the pipe fitting without surface damage. A rotating assembly, driven by a gear ring-screw barrel-rubber head structure, generates stable friction to drive the pipe fitting to rotate at a uniform speed. Combined with the continuous wire feeding of the welding gun, this achieves a uniform and aesthetically pleasing annular weld. After welding, a grinding assembly, aided by the pre-pressure of a compression spring, keeps the grinding disc in constant contact with the pipe fitting surface, completing circumferential grinding as the pipe fitting rotates. This effectively removes weld slag and burrs, avoiding the unevenness or omissions associated with manual grinding, and ultimately improving the surface quality and consistency of the weld.

[0007] The objective of this invention can be achieved through the following technical solutions: A trailer-mountable mobile welding machine includes a trailer transfer assembly comprising a trailer chassis and a protective cover. The trailer chassis is equipped with a grinding assembly and a centering clamping assembly. The trailer chassis is fixedly connected to the protective cover. A welding assembly is mounted on the protective cover. The welding assembly includes a U-shaped frame, on which a servo motor is mounted. A ball screw is mounted on the servo motor, and a mounting base is mounted on the ball screw. A welding gun is mounted on the mounting base. The grinding assembly includes an arc-shaped seat. The arc-shaped seat is provided with several sliding rods. One end of each sliding rod is provided with a grinding disc, and the other end is fixedly connected to a limiting block. A compression spring is provided between the limiting block and the arc-shaped seat, and the compression spring is sleeved on the sliding rod. A lead screw is provided on one side of the arc-shaped seat, and a limiting sliding rod is provided on the other side. A servo motor is provided on the lead screw, and the servo motor is mounted on the trailer chassis via a fixing block. The centering clamping assembly includes a clamping seat one and a clamping seat two, both of which are provided with... The system includes a supporting slide. Multiple clamping and rolling assemblies are arranged in a ring on both clamping base one and clamping base two. Clamping base two is equipped with a driving rotation assembly. A lead screw two is threadedly connected to one side of clamping base one and clamping base two, and a limit slide rod three is slidably connected to the other side of clamping base one and clamping base two. A servo motor three is mounted on the lead screw two and is mounted on the trailer chassis. Each clamping and rolling assembly includes a screw rod with a fixed seat on it. A rotating shaft is mounted on the fixed seat, and a rotating component is rotatably connected to the rotating shaft. The rubber roller has a screw threadedly connected to clamping seat one and clamping seat two respectively. The rotating drive assembly includes a gear ring with teeth on its outer arc surface and studs arranged in annular pattern on its inner arc surface. A screw cylinder is threadedly connected to the studs, and a rubber head is provided on the screw cylinder. A combination groove is provided on the inner wall of clamping seat two, and the gear ring is slidably embedded in the combination groove. The gear ring is connected to a gear through toothed gear meshing, and a servo motor four is provided on the gear, and the servo motor four is fixedly mounted on clamping seat two.

[0008] As a further embodiment of the present invention: the trailer transfer assembly further includes an argon cylinder, a power distribution controller, a slag collection box, heat dissipation holes, and a folding protective door. The protective cover is provided with a partition, the argon cylinder and the power distribution controller are both located on the upper surface of the partition, the heat dissipation holes are located on one side of the protective cover, a slag discharge trough is provided on the trailer chassis, the slag collection box is located in the slag discharge trough and is slidably connected to the trailer chassis, and the folding protective door is located on one side of the protective cover.

[0009] As a further aspect of the present invention: the U-shaped frame is disposed on the lower surface of the partition on the protective cover, and the U-shaped frame is located directly above the slag chute.

[0010] As a further aspect of the present invention: the welding assembly further includes a limiting slide rod, which is symmetrically arranged on both sides of the ball screw, and the limiting slide rod is slidably connected to the mounting base, and the limiting slide rod is arranged on the U-shaped frame.

[0011] As a further aspect of the present invention: the grinding assembly further includes a slag discharge port, and the slag discharge port is formed on the arc-shaped seat.

[0012] As a further embodiment of the present invention: the centering clamping assembly further includes a support column, and the support slide is fixedly connected to clamping seat one and clamping seat two respectively through the support column.

[0013] As a further aspect of the present invention, the clamping and rolling assembly further includes an anti-slip knob, which is disposed at the end of the screw.

[0014] As a further embodiment of the present invention: the rotating component further includes a limiting ring, which is slidably embedded in the combination groove and fixedly mounted on the gear ring.

[0015] The beneficial effects of this invention are: (1) In this invention, the functions of trailer transportation, centering clamping, segmented positioning welding, continuous rotary welding and automatic grinding are integrated into a complete mobile equipment. The trailer chassis and traction hook enable rapid transfer. After arriving at the site, no additional hoisting or complex tooling is required. The centering and fixing of the pipe fittings, initial weld point locking, full-circumference continuous welding and weld grinding can be completed in sequence. This eliminates the tedious steps of disassembling and assembling workpieces and changing equipment multiple times in the traditional process, and greatly shortens the total working time of pipeline welding operation.

[0016] (2) In this invention, the centering clamping assembly is used to ensure that the pipe is accurately centered without damaging the surface by means of the two seats moving in opposite directions and the rubber rollers distributed in a ring. The rotating assembly is driven to generate stable friction through the toothed ring-screw barrel-rubber head structure to drive the pipe to rotate at a uniform speed. With the continuous wire feeding of the welding gun, a uniform and beautiful annular weld is achieved. After welding, the grinding assembly uses the pre-pressure of the compression spring to keep the grinding disc always in contact with the surface of the pipe. It completes the circumferential grinding with the rotation of the pipe, effectively removing welding slag and burrs, avoiding the problem of uneven or missed manual grinding, and improving the surface quality and consistency of the weld.

[0017] (3) In this invention, each execution component (welding, grinding, clamping, rotation) is driven by an independent servo motor and achieves precise linear or rotary motion through guide mechanisms such as lead screws and slides, which facilitates programmed control. At the same time, the design of the slide and spring in the grinding component allows the grinding disc to adapt to changes in pipe diameter and weld height without frequent manual adjustment. The screw of the clamping rolling component can adjust the clamping force of the rubber rollers individually to adapt to different pipe diameters. The overall layout is compact and integrated on the trailer chassis. The protective cover can shield against wind and sand and splashes, making it particularly suitable for mobile operation scenarios such as outdoor pipeline emergency repair and long-distance pipeline construction. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the trailer chassis structure in this invention; Figure 3 This is a schematic diagram of the internal structure of the protective cover in this invention; Figure 4 This is a schematic diagram of the welding assembly in this invention; Figure 5 This is a schematic diagram of the U-shaped frame in this invention; Figure 6 This is a schematic diagram of the grinding component in this invention; Figure 7 yes Figure 6 Enlarged view of point A in the middle; Figure 8 This is a schematic diagram of the structure of the clamping and rolling component in this invention; Figure 9 This is a cross-sectional view of the clamping seat two in this invention; Figure 10 This is a schematic diagram of the structure of the rotating component in this invention.

[0020] In the diagram: 1. Trailer transfer assembly; 2. Welding assembly; 3. Grinding assembly; 4. Centering clamping assembly; 101. Protective cover; 102. Folding protective door; 103. Slag collection box; 104. Trailer chassis; 105. Heat dissipation holes; 106. Power distribution controller; 107. Argon cylinder; 108. Slag chute; 201. Servo motor one; 202. Ball screw; 203. Limiting slide bar one; 204. U-shaped frame; 205. Mounting base; 206. Welding gun; 301. Servo motor two; 302. Limiting slide bar two; 303. Screw one; 304. Arc-shaped seat; 305. Grinding disc; 306. Slide bar; 30 7. Compression spring; 308. Limiting block; 401. Servo motor three; 402. Lead screw two; 403. Limiting slide rod three; 404. Clamping seat one; 405. Clamping rolling assembly; 406. Support slide; 407. Clamping seat two; 408. Servo motor four; 409. Driving rotation assembly; 4010. Slide groove; 4051. Anti-slip knob; 4052. Screw; 4053. Fixed seat; 4054. Rotating shaft; 4055. Rubber roller; 4081. Gear; 4091. Limiting ring; 4092. Tooth; 4093. Gear ring; 4094. Stud; 4095. Screw barrel; 4096. Rubber head. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1-10As shown, the present invention is a trailer-mountable mobile welding machine, including a trailer transfer assembly 1. The trailer transfer assembly 1 includes a trailer chassis 104 and a protective cover 101. A grinding assembly 3 and a centering clamping assembly 4 are disposed on the trailer chassis 104. The trailer chassis 104 is fixedly connected to the protective cover 101. A welding assembly 2 is disposed on the protective cover 101. The welding assembly 2 includes a U-shaped frame 204. A servo motor 201 is disposed on the U-shaped frame 204. A ball screw 202 is disposed on the servo motor 201. A mounting base 205 is disposed on the ball screw 202. A welding gun 206 is disposed on the mounting base 205. The grinding assembly 3 includes an arc-shaped seat 304. The system is equipped with several sliding rods 306. One end of each sliding rod 306 is fitted with a grinding disc 305, and the other end is fixedly connected to a limiting block 308. A compression spring 307 is positioned between the limiting block 308 and the arc-shaped seat 304, and the compression spring 307 is sleeved on the sliding rod 306. A lead screw 303 is located on one side of the arc-shaped seat 304, and a limiting sliding rod 302 is located on the other side. A servo motor 301 is mounted on the lead screw 303 and is mounted on the trailer chassis 104 via a fixing block. The centering clamping assembly 4 includes a clamping seat 404 and a clamping seat 407, both of which are equipped with supporting sliding blocks. Platform 406, the clamping seat one 404 and the clamping seat two 407 are each annularly arranged with multiple clamping rolling components 405, and the clamping seat two 407 is provided with a driving rotation component 409. One side of the clamping seat one 404 and the clamping seat two 407 is threadedly connected to a lead screw two 402, and the other side of the clamping seat one 404 and the clamping seat two 407 is slidably connected to a limit slide rod three 403. The lead screw two 402 is provided with a servo motor three 401, and the servo motor three 401 is mounted on the trailer chassis 104. The clamping rolling component 405 includes a screw 4052, a fixed seat 4053 is provided on the screw 4052, and a rotating shaft 4054 is provided on the fixed seat 4053. The rotating shaft 4054 is rotatably connected to... A rubber roller 4055 is attached. The screw 4052 is threadedly connected to clamping seat 1 404 and clamping seat 2 407 respectively. The rotating drive assembly 409 includes a gear ring 4093. The outer arc surface of the gear ring 4093 is provided with teeth 4092. The inner arc surface of the gear ring 4093 is provided with studs 4094 arranged in a ring. A screw barrel 4095 is threadedly connected to the studs 4094. A rubber head 4096 is provided on the screw barrel 4095. The inner wall of clamping seat 2 407 is provided with a sliding groove 4010. The gear ring 4093 is slidably embedded in the sliding groove 4010. The gear ring 4093 is meshed with a gear 4081 through teeth 4092. A servo motor 408 is provided on the gear 4081.Furthermore, the servo motor 408 is fixedly mounted on the clamping base 407.

[0023] It should be noted that servo motor 1 201, servo motor 2 301, servo motor 3 401, servo motor 4 408, lead screw 1 303, lead screw 2 402 and ball screw 202 are all prior art. This application does not improve them. Therefore, it is not necessary to disclose their specific mechanical structure and circuit structure, and it does not affect the integrity of this application.

[0024] The implementation principle of this invention is as follows: First, the entire machine is attached to a mobile vehicle via the connecting frame and towing hook on the front side of the trailer chassis 104 for convenient transportation. After arriving at the work site, the operator feeds the pipe to be welded into the centering clamping assembly 4. The centering clamping assembly 4 consists of clamping seat one 404 and clamping seat two 407, which are symmetrically arranged on the trailer chassis 104. The servo motor three 401 drives the lead screw two 402 to rotate, causing clamping seat one 404 and clamping seat two 407 to move towards each other along the limiting slide bar three 403, thereby clamping the pipe from both ends. Multiple clamping rolling assemblies 405 are arranged in a ring on each clamping seat. After the screw 4052 is screwed into clamping seat one 404 and clamping seat two 407, the rubber roller 405... 5. The pipe fitting is tightly attached to its outer wall, providing stable support without hindering subsequent rotation. Then, the welding stage begins. Welding assembly 2 is positioned above protective cover 101. U-shaped frame 204 spans the pipe fitting axis. Servo motor 1 201 drives mounting base 205 up and down via ball screw 202, precisely adjusting welding gun 206 to the weld position. During the initial welding, rotation is not initiated; only a small section of the pipe fitting between clamping base 1 404 and clamping base 2 407 is spot-welded to form an initial weld point, preventing pipe fitting displacement during subsequent rotation. After initial fixation, the rotating assembly 409 is activated: servo motor 408 drives gear 4081, which meshes with the teeth 4092 on the outer arc surface of gear ring 4093. 093 is embedded in the groove 4010 of the clamping seat 407 and can rotate freely. The screw 4094 arranged in annular on the inner arc surface of the gear ring 4093 is threaded to the screw barrel 4095. The front end of the screw barrel 4095 is equipped with a rubber head 4096. Before the gear ring 4093 rotates, the screw barrel 4095 is moved on the screw 4094 by manually rotating it, thereby driving the rubber head 4096 to press against the outer wall of the pipe fitting. Finally, the friction force drives the entire pipe fitting to rotate at a uniform speed. At this time, the welding gun 206 keeps the wire continuously output, realizing welding while rotating, thereby obtaining a uniform and beautiful annular weld. After the welding is completed, the grinding process is immediately started. The servo motor 301 in the grinding assembly 3 drives the arc seat 304 along the limit slide through the lead screw 303. The second rod 302 moves axially, bringing the arc-shaped seat 304 closer to the weld area. Multiple sliding rods 306 are evenly distributed on the arc-shaped seat 304. One end of the sliding rod 306 is equipped with a grinding disc 305, and the other end passes through the arc-shaped seat 304 and is fitted with a compression spring 307. A limiting block 308 prevents it from falling off. When the arc-shaped seat 304 is pushed forward, the grinding disc 305 always adheres to the surface of the pipe under the preload of the spring. At the same time, the rotating component 409 continues to drive the pipe to rotate. The grinding disc 305 can then uniformly grind the circumference of the weld, remove welding slag and burrs, and improve the surface quality. The entire process realizes an integrated operation from transfer, centering and clamping, segmented welding, continuous rotary welding to final automatic grinding, which greatly improves the efficiency and consistency of pipeline welding.

[0025] like Figures 1-2As shown, in a preferred embodiment of the present invention, the trailer transfer assembly 1 further includes an argon tank 107, a power distribution controller 106, a slag collection box 103, a heat dissipation hole 105, and a folding protective door 102. A partition is provided on the protective cover 101. The argon tank 107 and the power distribution controller 106 are both located on the upper surface of the partition. The heat dissipation hole 105 is located on one side of the protective cover 101. A slag discharge trough 108 is provided on the trailer chassis 104. The slag collection box 103 is located within the slag discharge trough 108 and is slidably connected to the trailer chassis 104. The folding protective door 102 is located on one side of the protective cover 101. It should be noted that by combining the argon tank 107 and the power distribution controller 106... The 06 components are centrally arranged above the partition of the protective cover 101, which not only makes full use of the internal space of the protective cover 101, making the overall structure more compact and orderly, but also avoids messy tangling of pipelines, making daily maintenance and quick repair easier. The heat dissipation holes 105 are opened on one side of the protective cover 101, which can effectively guide the heat generated during welding to be discharged in a directional manner, prevent the components from overheating, and extend the service life of the equipment. The slag chute 108 on the trailer chassis 104, together with the pull-out slag collection box 103, realizes the immediate separation and centralized cleaning of slag, eliminating the need for manual cleaning during machine shutdown, and greatly improving the efficiency of continuous operation. The design of the folding protective door 102 further optimizes the operation entrance. When opened, it occupies little space, and when closed, it forms a complete protection, ensuring safety without hindering the loading and unloading of workpieces.

[0026] like Figure 4 As shown, in a preferred embodiment of the present invention, the U-shaped frame 204 is disposed on the lower surface of the partition on the protective cover 101, and the U-shaped frame 204 is located directly above the slag chute 108. It should be noted that the U-shaped frame 204 is arranged below the partition of the protective cover 101, which not only makes full use of the internal space of the protective cover 101, making the overall structure more compact and regular, but also avoids the messy entanglement of pipelines.

[0027] like Figure 5As shown, in a preferred embodiment of the present invention, the welding assembly 2 further includes a limiting slide bar 203. The limiting slide bar 203 is symmetrically arranged on both sides of the ball screw 202, and the limiting slide bar 203 is slidably connected to the mounting base 205. The limiting slide bar 203 is mounted on the U-shaped frame 204. It should be noted that by symmetrically arranging the limiting slide bars 203 on both sides of the ball screw 202 and forming a sliding fit with the mounting base 205, the operation of the mounting base 205 can be significantly improved. Regarding the guiding accuracy and torsional resistance during the motion process, firstly, the parallel double-rod structure effectively constrains the rotational freedom of the mounting base 205 around the lead screw axis, avoiding eccentric loading or jamming due to unilateral force, thus ensuring that the welding head always moves stably along the predetermined trajectory. Secondly, the fixed connection between the limiting slide rod 203 and the U-shaped frame 204 enhances the overall rigidity, enabling the mounting base 205 to maintain a low amplitude and low noise operating state during high-speed reciprocating motion, significantly reducing the risk of weld seam displacement or molten pool fluctuation caused by vibration.

[0028] like Figures 6-7 As shown, in a preferred embodiment of the present invention, the grinding component 3 further includes a slag discharge port, which is located on the arc-shaped seat 304. It should be noted that by opening the slag discharge port on the arc-shaped seat 304, the guide surface of the arc-shaped seat 304 can be used to allow the welding slag generated during grinding to slide naturally along the arc surface and converge at the slag discharge port, thereby achieving directional collection and centralized discharge of welding slag. Compared with the traditional planar structure, which easily leads to welding slag splashing everywhere and accumulating in the dead corners of the equipment and being difficult to clean, this design significantly improves the collection efficiency of welding slag and avoids welding slag residue from interfering with subsequent processes or scratching the surface of the workpiece.

[0029] like Figure 8 As shown in the preferred embodiment of the present invention, the centering clamping assembly 4 further includes a support column. The support slide 406 is fixedly connected to the clamping seat 1 404 and the clamping seat 2 407 respectively through the support column. It should be noted that this effectively disperses the radial and axial forces generated during the clamping process, avoiding component deformation or displacement caused by local force concentration. This rigid connection not only suppresses vibration transmission, but also ensures that the clamping seats on both sides maintain a precise centering state under long-term reciprocating motion, thereby significantly reducing the error of repeated positioning.

[0030] like Figure 8As shown, in a preferred embodiment of the present invention, the clamping and rolling assembly 405 further includes an anti-slip knob 4051, which is disposed at the end of the screw 4052. It should be noted that, firstly, the surface of the anti-slip knob 4051 adopts a textured or uneven structure, which effectively increases the friction between the fingers and the knob. Even when the hands are wet, oily, or wearing gloves, the operator can easily apply force and rotate stably, avoiding adjustment failure or misoperation caused by slippage. Secondly, the knob is located at the end of the screw 4052, which allows the operator to directly rotate it manually without the aid of additional tools, greatly simplifying the clamping or releasing process and improving work efficiency.

[0031] like Figures 9-10 As shown in the preferred embodiment of the present invention, the rotating drive assembly 409 further includes a limiting ring 4091. The limiting ring 4091 is slidably embedded in the combination groove and is fixedly mounted on the gear ring 4093. It should be noted that, through the slidable fit between the limiting ring 4091 and the combination groove, the radial displacement and axial movement of the gear ring 4093 within the clamping seat 407 can be effectively limited, thereby significantly improving the smoothness and consistency of the gear ring 4093's rotation. This structure eliminates the vibration and noise caused by backlash or wobble in traditional gear transmissions, allowing the gear ring 4093 to maintain a precise meshing trajectory under high-speed or heavy-load conditions, avoiding damage to the transmission components from jamming or impact loads. At the same time, the limiting ring 4091, as an independent guiding element, can evenly distribute the lateral force on the gear ring 4093, reducing the risk of local wear and extending the service life of the clamping seat 407 and the gear ring 4093.

Claims

1. A trailer-mountable mobile welding machine, characterized in that, The trailer transfer assembly (1) includes a trailer chassis (104) and a protective cover (101). The trailer chassis (104) is provided with a grinding assembly (3) and a centering clamping assembly (4). The trailer chassis (104) is fixedly connected to the protective cover (101). The protective cover (101) is provided with a welding assembly (2). The welding assembly (2) includes a U-shaped frame (204), a servo motor (201) is provided on the U-shaped frame (204), a ball screw (202) is provided on the servo motor (201), a mounting base (205) is provided on the ball screw (202), and a welding gun (206) is provided on the mounting base (205). The grinding assembly (3) includes an arc-shaped seat (304), on which a plurality of slide rods (306) are provided. A grinding disc (305) is provided at one end of each slide rod (306), and a limiting block (308) is fixedly connected to the other end of each slide rod (306). A compression spring (307) is provided between the limiting block (308) and the arc-shaped seat (304), and the compression spring (307) is sleeved on the slide rod (306). A lead screw (303) is provided on one side of the arc-shaped seat (304), and a limiting slide rod (302) is provided on the other side of the arc-shaped seat (304). A servo motor (301) is provided on the lead screw (303), and the servo motor (301) is mounted on the trailer chassis (104) by a fixing block. The centering clamping assembly (4) includes a clamping seat one (404) and a clamping seat two (407). Both clamping seat one (404) and clamping seat two (407) are provided with a support slide (406). Both clamping seat one (404) and clamping seat two (407) are provided with a plurality of clamping rolling assemblies (405) arranged in a ring. The clamping seat two (407) is provided with a drive rotation assembly (409). One side of clamping seat one (404) and clamping seat two (407) is threadedly connected to a lead screw two (402). The other side of clamping seat one (404) and clamping seat two (407) is slidably connected to a limit slide rod three (403). The lead screw two (402) is provided with a servo motor three (401), and the servo motor three (401) is provided on the trailer chassis (104). The clamping and rolling assembly (405) includes a screw (4052), a fixed seat (4053) is provided on the screw (4052), a rotating shaft (4054) is provided on the fixed seat (4053), a rubber roller (4055) is rotatably connected to the rotating shaft (4054), and the screw (4052) is threadedly connected to clamping seat one (404) and clamping seat two (407) respectively; The rotating drive assembly (409) includes a gear ring (4093), the outer arc surface of the gear ring (4093) is provided with teeth (4092), the inner arc surface of the gear ring (4093) is provided with studs (4094) arranged in annularly, and a screw barrel (4095) is threadedly connected to the studs (4094), and a rubber head (4096) is provided on the screw barrel (4095). The inner wall of the clamping seat 2 (407) is provided with a combination groove, and the gear ring (4093) is slidably connected in the combination groove. The gear ring (4093) is connected to the gear (4081) through the gear teeth (4092). The gear (4081) is provided with a servo motor 4 (408), and the servo motor 4 (408) is fixedly mounted on the clamping seat 2 (407).

2. The mobile welding machine that can be towed according to claim 1, characterized in that, The trailer transfer assembly (1) also includes an argon tank (107), a power distribution controller (106), a slag collection box (103), a heat dissipation hole (105), and a folding protective door (102). A partition is provided on the protective cover (101). The argon tank (107) and the power distribution controller (106) are both located on the upper surface of the partition. The heat dissipation hole (105) is located on one side of the protective cover (101). A slag discharge trough (108) is provided on the trailer chassis (104). The slag collection box (103) is located in the slag discharge trough (108) and is slidably connected to the trailer chassis (104). The folding protective door (102) is located on one side of the protective cover (101).

3. A trailer-mountable mobile welding machine according to claim 1, characterized in that, The U-shaped frame (204) is set on the lower surface of the partition on the protective cover (101), and the U-shaped frame (204) is directly above the slag chute (108).

4. A trailer-mountable mobile welding machine according to claim 1, characterized in that, The welding assembly (2) also includes a limiting slide bar (203), which is symmetrically arranged on both sides of the ball screw (202), and the limiting slide bar (203) is slidably connected to the mounting base (205), and the limiting slide bar (203) is arranged on the U-shaped frame (204).

5. A trailer-mountable mobile welding machine according to claim 1, characterized in that, The grinding assembly (3) also includes a slag discharge port, which is located on an arc-shaped seat (304).

6. A trailer-mountable mobile welding machine according to claim 1, characterized in that, The centering clamping assembly (4) also includes a support column, and the support slide (406) is fixedly connected to clamping seat one (404) and clamping seat two (407) respectively through the support column.

7. A trailer-mountable mobile welding machine according to claim 1, characterized in that, The clamping and rolling assembly (405) also includes an anti-slip knob (4051), which is disposed at the end of the screw (4052).

8. A trailer-mountable mobile welding machine according to claim 1, characterized in that, The rotating drive assembly (409) also includes a limiting ring (4091), which is slidably embedded in the combination groove and is fixedly mounted on the gear ring (4093).

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