A semi-trailer chassis frame welding device

Abstract

This invention relates to the field of truck bed frame welding technology, and discloses a semi-trailer truck bed chassis frame welding device, including a main frame placed at the angle between two intersecting frame profiles, and a fixing mechanism and a spot welding mechanism. The fixing mechanism includes fixing blocks respectively disposed on both sides of the main frame. Each fixing block has a telescopic rod assembly on the side away from the main frame. The two telescopic rod assemblies are perpendicular to each other. The end of the telescopic rod assembly is provided with a mounting bracket. The end of the mounting bracket is rotatably connected to a main shaft. A rotating seat is fixedly connected to the middle of the main shaft. A fixed suction head is provided on one side of the rotating seat, and a mounting plate is provided on the other side of the rotating seat. This invention uses magnetic suction wheels on both sides to contact the frame profiles, utilizing the rolling adsorption characteristics of the magnetic suction wheels on the steel plate surface to enable the device to vertically clamp and position the I-beams and square tubes.

Description

Technical Field

[0001] This invention relates to the field of welding technology for the chassis frame of a semi-trailer, specifically a welding device for the chassis frame of a semi-trailer. Background Technology

[0002] In existing technologies, during the manufacturing process of a semi-trailer chassis frame, multiple I-beams are typically used as the main supporting beams, arranged parallel and spaced along the length of the chassis. Square tubes are placed between adjacent I-beams as reinforcing ribs to enhance the overall structural strength and load-bearing capacity of the frame. When welding the square tubes to the I-beams, to ensure their perpendicularity and that the relative positional accuracy and geometric tolerances of the frame components meet design requirements, the commonly used method is to pre-design and manufacture a large clamping fixture that matches the chassis frame's dimensions. This clamping fixture is equipped with multiple positioning slots and corresponding clamping mechanisms, enabling it to position and clamp all I-beams and square tubes according to their preset relative positions, ensuring that each component remains in its original position during welding. After all components are clamped and positioned, the operator uses a welding torch to spot weld each connection node to initially fix the relative positions of the components. After the spot welding is completed, the entire spot-welded frame is lifted and rotated from a horizontal position to a vertical position using lifting equipment so that each weld can be fully welded, thus completing the overall welding and manufacturing of the chassis frame.

[0003] However, the aforementioned existing technical solutions have significant shortcomings in practical production applications. Due to the large overall size of the semi-trailer chassis frame, in order to meet the requirement of simultaneously and effectively fixing all components, the clamping fixture needs to have a correspondingly large structural size and high structural rigidity. This results in a complex fixture structure, containing numerous positioning and clamping elements. During clamping operations, operators must sequentially position and clamp each I-beam and square tube, making the clamping steps cumbersome and time-consuming, severely restricting the improvement of welding efficiency. Existing clamping fixtures adopt a clamping method that fixes all components at once, and the fixture structure lacks the flexibility to adapt to step-by-step welding processes, leading to an unreasonable connection between clamping operations and welding processes. Therefore, there is an urgent need for a semi-trailer chassis frame welding device with a simpler structure and more convenient operation to overcome the shortcomings of the existing technology. Summary of the Invention This invention provides a welding device for the chassis frame of a semi-trailer, which solves the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A semi-trailer box chassis frame welding device includes a main frame, which is placed at the included angle of two intersecting frame profiles, and also includes a fixing mechanism and a spot welding mechanism. The fixing mechanism includes fixing blocks respectively disposed on both sides of the main frame. Each fixing block has a telescopic rod assembly on the side away from the main frame. The two telescopic rod assemblies are arranged perpendicular to each other. The end of the telescopic rod assembly is provided with a mounting frame. The end of the mounting frame is rotatably connected to a main shaft. A rotating seat is fixedly connected to the middle of the main shaft. A fixing suction head is provided on one side of the rotating seat. A mounting plate is provided on the other side of the rotating seat. At least two magnetic suction wheels are provided on the side of the mounting plate along the length direction of the frame profile. The mounting frame is provided with a positioning component that drives the mounting plate to be kept perpendicular to the telescopic rod assembly. A spot welding mechanism is located in the middle of the main frame and is used to spot weld the contact points of the two frame profiles.

[0005] As a preferred embodiment of the present invention, the mounting plate is provided with at least two magnetic rollers along the width direction of the frame profile. When the magnetic rollers are attracted to the surface of the frame profile or the fixed suction head is attracted to the surface of the frame profile, the telescopic rod assembly is arranged perpendicular to the surface of the frame profile. A pulling device is provided on the side of the mounting plate near the contact position of the two frame profiles. The pulling device is used to drive the mounting plate to move toward the contact position of the two frame profiles.

[0006] As a preferred embodiment of the present invention, the pulling device includes a limiting block fixedly connected to the side of the mounting plate, a pulling rod slidably connected to the middle of the limiting block, a limiting plate provided at one end of the pulling rod near the center of the mounting plate, a pulling spring provided between the limiting plate and the limiting block, a fixing rod provided at one end of the pulling rod away from the center of the mounting plate, a connecting block provided in the middle of the fixing rod, and a magnetic block for adsorbing the frame profile provided on the side of the connecting block.

[0007] As a preferred embodiment of the present invention, the fixing rod is rotatably connected to the connecting block. When the magnetic block rotates to the side of the mounting plate away from the magnetic wheel, the side of the connecting block away from the magnetic block is in contact with the side of the mounting plate.

[0008] As a preferred embodiment of the present invention, the positioning component includes a sliding sleeve fixedly connected to the inside of the mounting bracket, a sliding rod slidably connected to the sliding sleeve, a positioning plate provided at the end of the sliding rod, and a spring provided inside the sliding sleeve for driving the sliding rod to move away from the sliding sleeve. When the end of the fixed suction head or the magnetic suction wheel abuts against the positioning plate, the mounting plate is perpendicular to the telescopic rod assembly.

[0009] As a preferred embodiment of the present invention, the telescopic rod assembly includes guide rods disposed on both sides of the fixed block. The ends of the guide rods are fixedly connected to a fixed plate disposed parallel to the fixed block. A telescopic plate is slidably connected to the middle of the guide rods. A telescopic screw is threadedly connected to the middle of the telescopic plate. The two ends of the telescopic screw are rotatably connected to the fixed block and the fixed plate, respectively. A telescopic rod is disposed at the end of the telescopic plate and slidably connected to the fixed plate. A suspension plate is fixedly connected to the end of the telescopic rod away from the fixed block. The mounting bracket is fixedly connected to the side of the suspension plate.

[0010] As a preferred embodiment of the present invention, the spot welding mechanism includes a positioning block that slides along the inner side of the main frame, a universal connector is provided between the two positioning blocks, a flipping block is provided in the middle of the universal connector, a gripping rod is slidably connected in the middle of the flipping block, and a welding device is provided at one end of the gripping rod near the frame profile.

[0011] As a preferred embodiment of the present invention, the welding device includes an extension rod slidably connected to the gripping rod, the end of the extension rod being provided with a welding head, and the end of the gripping rod being threadedly connected with a locking nut, the locking nut being used to limit the extension length of the extension rod.

[0012] As a preferred embodiment of the present invention, a fixing ring is provided in the middle of the gripping rod, and a return spring is provided between the fixing ring and the flipping block. The return spring is used to drive the gripping rod to move away from the frame profile.

[0013] As a preferred embodiment of the present invention, a fixing beam is provided on the side of the fixing ring, and a positioning clip is provided at the end of the fixing beam, the positioning clip engaging with the positioning block.

[0014] The present invention has the following advantages: 1. Simplified Structure and Reduced Cost: This invention utilizes magnetic rollers on both sides of the device. By contacting the square tubes and I-beams with these rollers, the welding device itself can vertically clamp and position the frame profiles, eliminating the need for complex and bulky specialized clamping fixtures for the entire chassis frame, as required by existing technologies. This structural simplification directly reduces the hardware and construction costs of welding processing.

[0015] 2. Convenient Operation and Improved Efficiency: This invention, through its adjustable telescopic rod assembly and spot welding mechanism, can quickly adapt to chassis frame nodes of different sizes. Furthermore, due to the use of magnetic wheels for positioning, the operator only needs to place the device at the node to complete the positioning, eliminating the cumbersome individual clamping steps of existing technologies and significantly improving the efficiency of welding operations.

[0016] 3. Improved Positioning Accuracy and Reliability: The fixing mechanism of this invention, through the cooperation of the rotating base and the positioning component, can switch between two working modes: "magnetic wheel positioning" or "fixed suction head positioning". In magnetic wheel mode, the four magnetic wheels simultaneously attract and forcibly correct the perpendicularity of the square tube and the I-beam, ensuring the positioning accuracy of the welding joint. Under high-precision requirements, the fixed suction head mode provides a more stable reference, further improving the reliability of welding positioning.

[0017] 4. Welding Quality Assurance: The reset spring and positioning clamp in the spot welding mechanism of this invention work together to automatically reset and lock the welding head when not in operation, preventing the welding head from deviating from the predetermined welding position due to accidental contact or free swinging of the universal joint. At the same time, the pulling device can automatically compensate when the welding gap is large, ensuring that the square tube and the I-beam fit tightly together, thereby effectively improving the quality of spot welding.

[0018] 5. High adaptability and flexible production: This invention can position and weld each intersection node in a step-by-step and independent manner. This working mode gives it excellent flexibility and adaptability. No matter how the size of the chassis frame changes, or only local nodes need to be repaired by welding, this invention can be used directly without reconfiguration or adjustment of large tooling, overcoming the shortcomings of the lack of flexibility and adaptability of tooling in the prior art. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0020] Figure 1 This is a schematic diagram of the connection between a semi-trailer chassis frame welding device and frame profiles.

[0021] Figure 2 This is a schematic diagram of a welding device for the chassis frame of a semi-trailer.

[0022] Figure 3 This is a schematic diagram of the fixing mechanism in a welding device for the chassis frame of a semi-trailer.

[0023] Figure 4 This is a schematic diagram of the positioning component in a welding device for the chassis frame of a semi-trailer.

[0024] Figure 5 This is a schematic diagram of the traction device in a semi-trailer chassis frame welding device.

[0025] Figure 6This is a schematic diagram of the structure of a semi-trailer chassis frame welding device when the magnetic block and the magnetic wheel are located on the same side of the mounting plate.

[0026] Figure 7 This is a schematic diagram of the structure of a welding device for a semi-trailer chassis frame when the fixed suction head rotates to the outside of the mounting frame.

[0027] Figure 8 This is a schematic diagram of the spot welding mechanism in a semi-trailer chassis frame welding device.

[0028] Figure 9 This is a schematic diagram of the structure of a welding device for the chassis frame of a semi-trailer, showing the cooperation between the universal joint and the tilting block.

[0029] In the diagram: 1. Main frame; 2. Fixing mechanism; 3. Spot welding mechanism; 4. Fixing block; 5. Guide rod; 6. Telescopic plate; 7. Telescopic screw; 8. Telescopic rod; 9. Fixing plate; 10. Suspension plate; 11. Telescopic rod assembly; 12. Mounting bracket; 13. Sliding sleeve; 14. Sliding rod; 15. Positioning plate; 16. Positioning assembly; 17. Main shaft; 18. Rotary seat; 19. Mounting plate; 20. Magnetic suction wheel; 21. Fixed suction head; 22. Pulling mechanism. Device; 23. Frame profile; 24. Limiting block; 25. Limiting plate; 26. Pull rod; 27. Pull spring; 28. Fixing rod; 29. ​​Connecting block; 30. Magnetic block; 31. Holding rod; 32. Locking nut; 33. Extension rod; 34. Welding head; 35. Fixing ring; 36. Flipping block; 37. Universal connector; 38. Return spring; 39. Welding device; 40. Positioning block; 41. Positioning clip; 42. Fixing beam. Detailed Implementation

[0030] 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.

[0031] In one embodiment, see Figure 1 and Figure 2 A welding device for a semi-trailer chassis frame includes a U-shaped main frame 1. The main frame 1 is placed at the angle formed by intersecting I-beam longitudinal beams and square tube crossbeams during use. Fixing mechanisms 2 are respectively provided on the outer sides of the two sides of the main frame 1, corresponding to the longitudinal beams and crossbeams respectively. A spot welding mechanism 3 is provided in the middle of the main frame 1.

[0032] In one instance of this embodiment, please refer to Figures 1-7Specifically, fixing blocks 4 are fixedly connected to both sides of the main frame 1. Each of the two fixing blocks 4 is equipped with a telescopic rod assembly 11, and the two telescopic rod assemblies 11 are perpendicular to each other. Each telescopic rod assembly 11 includes two parallel guide rods 5, one end of which is fixedly connected to the fixing block 4, and the other end is fixedly connected to the fixing plate 9. A telescopic plate 6 is slidably sleeved on the guide rod 5, and a telescopic screw 7 is threadedly connected to the middle of the telescopic plate 6. Both ends of the telescopic screw 7 are rotatably connected to the fixing block 4 and the fixing plate 9 respectively via bearings. A handwheel is fixed to the outer end of the telescopic screw 7; rotating the handwheel moves the telescopic plate 6 along the guide rod 5. Two parallel telescopic rods 8 are fixedly connected to the end of the telescopic plate 6. The telescopic rods 8 pass through the fixing plate 9 and are slidably connected to the fixing plate 9. A suspension plate 10 is fixedly connected to the outer end of the telescopic rod 8, and a mounting bracket 12 is fixedly connected to the outer side of the suspension plate 10.

[0033] The mounting bracket 12 has a U-shaped structure, with its open end rotatably connected to a main shaft 17 via a bearing. A rotating seat 18 is fixedly connected to the middle of the main shaft 17. The rotating seat 18 has a cuboid structure, with a fixed suction head 21 fixedly connected to one side and a mounting plate 19 fixedly connected to the opposite side. The fixed suction head 21 uses neodymium iron boron permanent magnets with a suction force of not less than 500N and a manual release lever on its side. The mounting plate 19 is a rectangular steel plate with four magnetic rollers 20 mounted on its outer side in a 2×2 array. The magnetic rollers 20 use radially multi-pole magnetized neodymium iron boron magnets, with a 1mm thick polyurethane rubber coating on their surface. The suction force of a single magnetic roller 20 is not less than 200N, allowing it to roll freely on the steel plate surface without slipping.

[0034] The mounting bracket 12 is internally equipped with a positioning component 16 to ensure that the mounting plate 19 remains perpendicular to the telescopic rod assembly 11. The positioning component 16 includes a sliding sleeve 13 fixed to the inner wall of the mounting bracket 12. A sliding rod 14 is slidably connected within the sliding sleeve 13, and a positioning plate 15 is fixed to the outer end of the sliding rod 14. A compression spring is installed inside the sliding sleeve 13, and the spring constantly pushes the sliding rod 14 outwards. When the rotating seat 18 rotates to the point where the magnetic suction wheel 20 faces outwards, the side of the fixed suction head 21 abuts against the positioning plate 15, at which point the mounting plate 19 is perpendicular to the telescopic rod assembly 11. When the rotating seat 18 rotates 180° to the point where the fixed suction head 21 faces outwards, the magnetic suction wheel 20 abuts against the positioning plate 15, at which point the magnetic suction surface of the fixed suction head 21 is also perpendicular to the telescopic rod assembly 11.

[0035] A pulling device 22 is installed on the side of the mounting plate 19 near the abutting side of the two frame profiles 23, for driving the mounting plate 19 to move toward the frame profiles 23. For example, when one of the fixed suction heads 21 attracts an I-beam and the magnetic suction wheel 20 on the other side attracts a square tube, the pulling device 22 will press the end of the square tube tightly against the side of the I-beam. The pulling device 22 includes a limiting block 24 fixed to the side of the mounting plate 19, a pulling rod 26 slidably passing through the limiting block 24, a limiting plate 25 fixed to one end of the pulling rod 26 near the center of the mounting plate 19, and a pulling spring 27 sleeved between the limiting plate 25 and the limiting block 24. A fixing rod 28 perpendicular to the pulling rod 26 is fixedly connected to the outer end of the pulling rod 26, a connecting block 29 is rotatably connected to the middle of the fixing rod 28, and a magnetic suction block 30 is fixed to the side of the connecting block 29. The magnetic suction block 30 is made of neodymium iron boron permanent magnet. When the magnetic block 30 is attracted to the surface of the square tube, the tension spring 27 pushes the square tube to move away from the mounting plate 19, that is, pushes the square tube to move towards the I-beam. The fixing rod 28 is rotatably connected to the connecting block 29. When the magnetic block 30 rotates to the side of the mounting plate 19 away from the magnetic wheel 20, the side of the connecting block 29 away from the magnetic block 30 is in contact with the side of the mounting plate 19. Therefore, a protrusion can be provided on the mounting plate 19. When the magnetic block 30 is not needed, the connecting block 29 can be rotated to a state parallel to the mounting plate 19, pushing the connecting block 29 over the protrusion, so that the connecting block 29 is confined inside the mounting plate 19, achieving the effect of limiting and fixing.

[0036] In one instance of this embodiment, please refer to Figure 1 , Figure 8 and Figure 9 The main frame 1 has a spot welding mechanism 3 on its inner side for spot welding intersecting nodes. The spot welding mechanism 3 includes two positioning blocks 40 that can slide along a groove on the inner side of the main frame 1. The two positioning blocks 40 are connected by a universal connector 37. The universal connector 37 can swing at any angle, facilitating spot welding at different positions. A flipping block 36 is fixedly connected to its center, and a gripping rod 31 slides through the flipping block 36. A welding device 39 is installed at the front end of the gripping rod 31. The welding device 39 includes an extension rod 33 slidably connected to the gripping rod 31. A CO2 gas shielded welding head 34 is installed at the front end of the extension rod 33. A locking nut 32 is threadedly connected to the front end of the gripping rod 31. Tightening the locking nut 32 fixes the extension length of the extension rod 33.

[0037] A fixing ring 35 is fixed to the middle of the gripping rod 31. A return spring 38 is sleeved between the fixing ring 35 and the flipping block 36. The return spring 38 constantly pushes the gripping rod 31 to move backward, so that the welding head 34 is away from the welding surface. A fixing beam 42 is fixedly connected to the side of the fixing ring 35. A positioning clip 41 is provided at the end of the fixing beam 42. The end of the positioning clip 41 has a U-shaped structure. When the return spring 38 pulls the gripping rod 31 to move backward, the U-shaped part of the positioning clip 41 is sleeved on the outside of the positioning block 40, thereby fixing the relative angle and position of the gripping rod 31. The gripping rod 31 will not swing freely due to the connection of the universal connector 37, thus fixing the spot welding mechanism 3 in the welding position without requiring the worker to hold it continuously.

[0038] The complete working process of this invention is as follows: Step S1: Preliminary Preparations Based on the dimensions of the semi-trailer chassis to be welded, two I-beam main longitudinal beams are placed parallel to each other on the welding platform, the spacing is adjusted, and they are temporarily fixed. Then, square tube crossbeams are placed vertically between the two longitudinal beams according to the design position, forming multiple cross-shaped nodes. In this step, the square tubes and longitudinal beams only need to be approximately perpendicular; subsequent precise adjustment and fixing can be achieved using the device of this invention.

[0039] Step S2: Device Adjustment Rotate the handwheels on the two telescopic rod assemblies 11 to drive the telescopic lead screw 7 to rotate, thereby adjusting the position of the telescopic plate 6 on the guide rod 5 so that the distance between the two mounting brackets 12 matches the size of the node to be welded. Subsequently, adjust the extension length of the extension rod 33 in the spot welding mechanism 3 so that the welding head 34 can be precisely aligned with the weld position of the intersection node, and tighten the locking nut 32 to fix it.

[0040] Step S3: Device Placement and Vertical Positioning The main frame 1 is placed at the included angle of the first cross intersection, with its two right-angled sides facing the longitudinal and transverse beams respectively. The rotating base 18 is rotated so that the four magnetic rollers 20 face outwards and adhere to the surface of the frame profile 23, allowing the device to roll freely along the profile surface. First, one side of the magnetic roller 20 is placed on the I-beam, and the entire welding device 39 is moved until the four magnetic rollers 20 on the other side simultaneously contact the side of the square tube. Due to the synchronized adsorption of the four magnetic rollers 20, the square tube and I-beam are forcibly adjusted to be perpendicular to each other under magnetic force, thus achieving vertical positioning.

[0041] Step S4: Spot welding operation Adjust the angles of the universal connector 37 and the flip block 36 to align the welding head 34 with the weld seam. The operator pushes the gripping rod 31 towards the connection point, causing the welding head 34 to contact the weld seam and perform spot welding. During welding, the operator can move the gripping rod 31 up and down or deflect it using the flip block 36, allowing the welding head 34 to weld at different locations, thus ensuring weld strength.

[0042] Step S5: Complete all welding Following steps S3 and S4 above, complete the spot welding of all intersecting nodes in sequence. After spot welding is completed, the frame is hoisted and flipped, and the operator uses a handheld welding gun to fully weld the spot-welded areas, thus achieving the welding and manufacturing of the chassis frame without the need for complex clamping devices.

[0043] Step S6: Welding process requiring high-precision positioning When high precision is required in the connection position of the square tube and the I-beam, the following operations can be performed: First, push the positioning plate 15 to disengage it from the fixed suction head 21; then flip the rotating seat 18 to move the fixed suction head 21 to the outside and the magnetic suction wheel 20 to the inside of the mounting bracket 12; next, release the positioning plate 15, and under the action of the spring, the positioning plate 15 simultaneously abuts against the four magnetic suction wheels 20, stopping the rotation of the main shaft 17. At this time, place the fixed suction head 21 in a fixed position on the side of the I-beam, thereby keeping the position of the welding device 39 fixed. Subsequently, move the square tube so that the side of the square tube simultaneously contacts the four magnetic suction wheels 20 on the other side, thereby completing the high-precision vertical placement of the square tube and the I-beam, followed by spot welding for fixation.

[0044] Step S7: Welding treatment with high weld gap requirements When only one side of the square tube contacts the I-beam, resulting in a large gap between the square tube and the I-beam, the following steps can be performed: First, following step S3, the magnetic rollers 20 on both sides are brought into contact with the sides of the I-beam and the square tube respectively, keeping them perpendicular. Then, the magnetic block 30 is moved towards the mounting plate 19, and then rotated to face the square tube, so that the magnetic block 30 is attracted to the outside of the square tube. At this time, since the tension spring 27 is in a stretched state, its restoring force drives the magnetic block 30 to move away from the mounting plate 19, thereby moving the square tube towards the I-beam, pressing the square tube tightly against the outside of the I-beam. Spot welding is then performed.

[0045] In this embodiment, the present invention provides a semi-trailer chassis frame welding device 39. Through the contact of the magnetic rollers 20 on both sides with the frame profile 23, and utilizing the rolling adsorption characteristics of the magnetic rollers 20 on the steel plate surface, the device itself completes the vertical clamping and positioning of the I-beams and square tubes. This eliminates the need for complex and bulky dedicated clamping fixtures for the entire chassis frame, as required by existing technologies, significantly reducing welding processing difficulty and hardware costs. Simultaneously, the cooperation between the rotating seat 18 and the positioning component 16 enables the switching between the magnetic rollers 20 and the fixed suction head 21, meeting high-precision positioning requirements. The traction device 22 and the reset spring 38 and positioning clamp 41 in the spot welding mechanism 3 ensure automatic compensation of the welding gap and reliable locking of the welding head 34 position, effectively improving welding quality. Furthermore, the present invention can independently complete positioning and welding for each intersection node, possessing excellent flexibility and overcoming the shortcomings of traditional fixtures that lack the flexibility for step-by-step welding.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A semi-trailer chassis frame welding device comprising a main frame placed at the included angle of two frame profiles arranged crosswise, characterized in that It also includes fixing mechanisms and spot welding mechanisms; The fixing mechanism includes fixing blocks respectively disposed on both sides of the main frame. Each fixing block has a telescopic rod assembly on the side away from the main frame. The two telescopic rod assemblies are arranged perpendicular to each other. The end of the telescopic rod assembly is provided with a mounting frame. The end of the mounting frame is rotatably connected to a main shaft. A rotating seat is fixedly connected to the middle of the main shaft. A fixing suction head is provided on one side of the rotating seat. A mounting plate is provided on the other side of the rotating seat. At least two magnetic suction wheels are provided on the side of the mounting plate along the length direction of the frame profile. The mounting frame is provided with a positioning component that drives the mounting plate to be kept perpendicular to the telescopic rod assembly. A spot welding mechanism is located in the middle of the main frame and is used to spot weld the contact points of the two frame profiles.

2. A semi-trailer chassis frame welding apparatus according to claim 1, characterised in that, The mounting plate is provided with at least two magnetic rollers along the width direction of the frame profile. When the magnetic rollers are attracted to the surface of the frame profile or the fixed suction head is attracted to the surface of the frame profile, the telescopic rod assembly is arranged perpendicular to the surface of the frame profile. A pulling device is provided on the side of the mounting plate near the contact position of the two frame profiles. The pulling device is used to drive the mounting plate to move toward the contact position of the two frame profiles.

3. The semi-trailer chassis frame welding device according to claim 2, characterized in that, The pulling device includes a limiting block fixedly connected to the side of the mounting plate, a pulling rod slidably connected to the middle of the limiting block, a limiting plate provided at the end of the pulling rod near the center of the mounting plate, a pulling spring provided between the limiting plate and the limiting block, a fixing rod provided at the end of the pulling rod away from the center of the mounting plate, a connecting block provided in the middle of the fixing rod, and a magnetic block for adsorbing the frame profile provided on the side of the connecting block.

4. The semi-trailer chassis frame welding device according to claim 3, characterized in that, The fixing rod is rotatably connected to the connecting block. When the magnetic block rotates to the side of the mounting plate away from the magnetic wheel, the side of the connecting block away from the magnetic block is in contact with the side of the mounting plate.

5. The semi-trailer chassis frame welding device according to claim 1, characterized in that, The positioning component includes a sliding sleeve fixedly connected to the inside of the mounting bracket. A sliding rod is slidably connected to the sliding sleeve. A positioning plate is provided at the end of the sliding rod. A spring is provided inside the sliding sleeve. The spring is used to drive the sliding rod to move away from the sliding sleeve. When the end of the fixed suction head or the magnetic suction wheel abuts against the positioning plate, the mounting plate is perpendicular to the telescopic rod assembly.

6. The semi-trailer chassis frame welding device according to claim 1, characterized in that, The telescopic rod assembly includes guide rods disposed on both sides of the fixed block. The ends of the guide rods are fixedly connected to fixed plates disposed parallel to the fixed block. The middle of the guide rods is slidably connected to a telescopic plate. The middle of the telescopic plate is threadedly connected to a telescopic screw. The two ends of the telescopic screw are rotatably connected to the fixed block and the fixed plate, respectively. The end of the telescopic plate is provided with a telescopic rod slidably connected to the fixed plate. The end of the telescopic rod away from the fixed block is fixedly connected to a suspension plate. The side of the suspension plate is fixedly connected to the mounting bracket.

7. The semi-trailer chassis frame welding device according to claim 1, characterized in that, The spot welding mechanism includes a positioning block that slides along the inner side of the main frame, a universal connector is provided between two positioning blocks, a flipping block is provided in the middle of the universal connector, a gripping rod is slidably connected in the middle of the flipping block, and a welding device is provided at one end of the gripping rod near the frame profile.

8. The semi-trailer chassis frame welding device according to claim 7, characterized in that, The welding device includes an extension rod slidably connected to the gripping rod, with a welding head at the end of the extension rod. A locking nut is threadedly connected to the end of the gripping rod, and the locking nut is used to limit the extension length of the extension rod.

9. A semi-trailer chassis frame welding device according to claim 7, characterized in that, A fixing ring is provided in the middle of the gripping rod, and a return spring is provided between the fixing ring and the flipping block. The return spring is used to drive the gripping rod to move away from the frame profile.

10. A semi-trailer chassis frame welding device according to claim 9, characterized in that, The fixed ring has a fixed beam on its side, and a positioning clip is provided at the end of the fixed beam. The positioning clip engages with the positioning block.

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