Automatic assembling and welding equipment for main frame of semi-trailer

Abstract

The invention relates to the technical field of welding, and particularly discloses automatic assembly welding equipment for a main frame of a semi-trailer, which is used for performing assembly welding processing on a main longitudinal beam and an auxiliary longitudinal beam in the main frame and comprises a placing frame, a transverse moving unit, a longitudinal moving unit, a pressing unit, a welding unit and a guiding unit, the transverse moving unit drives the auxiliary longitudinal beam to transversely move, and it is ensured that the auxiliary longitudinal beam is accurately attached to the main longitudinal beam; a top pressing roller of the pressing unit applies vertical downward pressure to the auxiliary longitudinal beam, a side pressing roller applies lateral extrusion force, buckling deformation of the auxiliary longitudinal beam in the welding process is effectively restrained through the dual effects, the assembly straightness and relative position precision of the main longitudinal beam and the auxiliary longitudinal beam are guaranteed, and dislocation is avoided; the guide unit guides the welding gun head in real time based on the extending path of the V-shaped groove of the auxiliary longitudinal beam, it is ensured that the welding gun head always moves along a preset track in the welding process, and deviation is prevented. And the longitudinal moving unit is combined to drive the welding gun to feed at a constant speed, so that the centering degree and continuity of a V-shaped groove welding seam are effectively improved, and the welding quality consistency is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and more specifically, to an automatic welding equipment for the main frame of a semi-trailer. Background Technology

[0002] In the manufacturing of the semi-trailer main frame, the main frame 100 is usually formed by two sets of parallel main longitudinal beams 110 connected by crossbeams 120 to form a frame structure; in order to enhance the load-bearing strength, secondary longitudinal beams 130 need to be welded to the inside of the main longitudinal beams 110 for reinforcement, and a V-shaped groove 140 is formed at the joint of the main longitudinal beams 110 and the corresponding secondary longitudinal beams 130 as the weld path. When welding the main longitudinal beam 110 and the corresponding secondary longitudinal beam 130, the welding thermal stress can easily cause the secondary longitudinal beam 130 to warp vertically or twist laterally, destroying its initial fit with the main longitudinal beam 110 and causing the V-groove 140 to misalign, affecting the straightness and positional accuracy of the assembly. In addition, the V-groove 140 is long and narrow along the inner side of the main longitudinal beam 110. Traditional welding equipment lacks a dynamic correction mechanism, and the welding torch is prone to deviating from the preset path, resulting in poor weld alignment and insufficient continuity, which weakens the structural strength. Summary of the Invention

[0003] To overcome the above-mentioned technical problems, this invention proposes an automatic welding equipment for the main frame of a semi-trailer.

[0004] The objective of this invention can be achieved through the following technical solutions: An automatic welding equipment for assembling and welding the main longitudinal beams and secondary longitudinal beams of a semi-trailer frame, comprising: A placement rack is used to place the main longitudinal beams; The transverse unit, which is movably mounted on the placement frame and can move laterally relative to the placement frame, is used to place the secondary longitudinal beam; The longitudinal moving unit is movably mounted on the transverse moving unit and can move longitudinally relative to the transverse moving unit; The pressing unit is disposed on the longitudinal moving unit and includes a top pressing roller adapted to the upper end face of the secondary longitudinal beam and a side pressing roller adapted to the side wall of the secondary longitudinal beam. A welding unit, which is disposed on the longitudinal moving unit, includes a welding torch, the bottom of which is provided with a welding torch head corresponding to the V-shaped groove between the main longitudinal beam and the secondary longitudinal beam; A guide unit, which is disposed on the pressing unit, is used to guide the welding torch head according to the extension path of the V-groove.

[0005] As a further aspect of the present invention: the transverse unit includes a transverse slide rail fixed horizontally on the placement frame and a transverse bracket slidably mounted on the transverse slide rail. The transverse bracket is provided with a transverse slide table that is slidably adapted to the transverse slide rail. The bottom of the placement frame is provided with a transverse cylinder for driving the transverse bracket.

[0006] As a further aspect of the present invention: the longitudinal movement unit includes a longitudinal movement groove longitudinally opened on the transverse bracket and a longitudinal movement slide table slidably embedded in the longitudinal movement groove. A longitudinal movement screw is rotatably installed in the longitudinal movement groove. The longitudinal movement screw is threadedly connected to the longitudinal movement slide table. A longitudinal movement motor for driving the longitudinal movement screw is also installed at one end of the transverse bracket.

[0007] As a further aspect of the present invention, it also includes a lifting unit disposed on the placement frame. The lifting unit includes a lifting cylinder and a fixing plate that are vertically fixedly installed on the lifting unit. The output end of the lifting cylinder is connected to the lifting plate, and a lifting guide rod that movably penetrates the fixing plate is vertically installed on the lifting plate.

[0008] As a further embodiment of the present invention: the pressing unit further includes a lifting cylinder vertically mounted on the longitudinal moving unit and an L-shaped bracket movably disposed below the longitudinal moving unit. The output end of the lifting cylinder is connected to a vertical slider, and a lifting guide rod that slides through the longitudinal moving unit is vertically fixed on the vertical slider. The L-shaped bracket is provided with a vertical slide groove and a horizontal slide groove. The vertical slider is vertically slidably embedded in the vertical slide groove, and the horizontal slider is horizontally slidably embedded in the horizontal slide groove. A connecting frame is fixed on the horizontal slider, and a connecting rod is hinged between the vertical slider and the horizontal slider. The top pressure roller is rotatably installed at the bottom of the L-shaped bracket, and the side pressure roller is rotatably installed on the connecting frame.

[0009] As a further aspect of the present invention: a transverse guide rod is horizontally fixed inside the transverse groove, the transverse slider moves through the transverse guide rod, and a first spring is movably sleeved on the transverse guide rod, the first spring being located on the side of the transverse slider away from the secondary longitudinal beam.

[0010] As a further embodiment of the present invention: the guiding unit includes two sets of transverse guide rails horizontally fixed to the bottom of the L-shaped bracket. A transverse slide table is slidably embedded in the transverse guide rail. A through groove is opened in the transverse slide table. A swing frame is movably inserted in the through groove. The welding unit is installed in the middle of the swing frame. A strip-shaped slide groove is symmetrically opened at both ends of the swing frame. A locking pin adapted to the corresponding strip-shaped slide groove is provided in the through groove. A rotating frame is rotatably installed at both ends of the swing frame. A guide roller is rotatably installed at the bottom of the rotating frame.

[0011] As a further aspect of the present invention, it also includes a cleaning unit disposed on the guiding unit, the cleaning unit comprising an air tube and an air nozzle disposed below the air tube.

[0012] As a further aspect of the present invention: the cleaning unit further includes a lifting rod that is vertically slidably installed on the guide unit, the lower end of the lifting rod is equipped with a vibrating block adapted to the V-groove, the top end of the lifting rod is provided with a limiting plate, and the upper end of the lifting rod is movably sleeved with a second spring that abuts against the limiting plate.

[0013] As a further aspect of the present invention: a cam adapted to a limiting plate is rotatably mounted on the outside of the trachea, and a blade coaxially and fixedly connected to the cam is movably disposed inside the trachea.

[0014] The beneficial effects of this invention are: The secondary longitudinal beam is driven to move laterally by the transverse unit to ensure that it fits precisely with the main longitudinal beam; the top pressure roller of the pressing unit applies vertical downward pressure to the secondary longitudinal beam, and the side pressure roller applies lateral extrusion pressure. The dual action effectively suppresses the warping deformation of the secondary longitudinal beam during welding, ensuring the straightness and relative position accuracy of the assembly of the main longitudinal beam and the secondary longitudinal beam, and avoiding misalignment. The guiding unit guides the welding torch head in real time based on the V-groove extension path of the secondary longitudinal beam, ensuring that the welding torch head always moves along the predetermined trajectory during the welding process and preventing deviation; combined with the longitudinal movement unit driving the welding torch to feed at a uniform speed, it effectively improves the centering and continuity of the V-groove weld and ensures consistent welding quality. Attached Figure Description

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] Figure 1 This is a perspective view of the present invention; Figure 2 This is a perspective view of the invention from another angle; Figure 3 This is a schematic diagram of the main frame structure in this invention; Figure 4 This is a schematic diagram of the transverse and longitudinal movement units in this invention; Figure 5 This is a partial structural diagram of the present invention; Figure 6 This is a schematic diagram of the pressing unit in this invention; Figure 7 This is a schematic diagram of the guiding unit in this invention; Figure 8 This is a schematic diagram of the welding unit and cleaning unit in this invention; Figure 9 This is a partial structural diagram of the cleaning unit in this invention.

[0017] In the picture: 100. Main frame; 110. Main longitudinal beam; 120. Crossbeam; 130. Secondary longitudinal beam; 140. V-groove; 200. Shelf; 300. Lifting unit; 310. Lifting cylinder; 320. Fixing plate; 330. Lifting plate; 340. Lifting guide rod; 400. Lateral movement unit; 410. Lateral movement slide rail; 420. Lateral movement slide table; 430. Lateral bracket; 500. Longitudinal traverse unit; 510. Longitudinal traverse groove; 520. Longitudinal traverse slide table; 530. Longitudinal traverse lead screw; 540. Longitudinal traverse motor; 600, Pressing unit; 610, Lifting cylinder; 620, Vertical slider; 630, Lifting guide rod; 640, L-shaped bracket; 641, Vertical slide groove; 642, Horizontal slide groove; 643, Horizontal guide rod; 644, First spring; 650, Horizontal slider; 651, Connecting frame; 660, Connecting rod; 670, Top pressure roller; 680, Side pressure roller; 700, Guide unit; 710, Transverse guide rail; 720, Transverse slide table; 721, Through groove; 722, Locking pin; 730, Swing frame; 731, Strip slide groove; 740, Rotating frame; 750, Guide roller; 800. Welding unit; 810. Welding torch; 820. Welding torch head; 900. Cleaning unit; 910. Air pipe; 920. Air nozzle; 930. Lifting rod; 940. Vibrating block; 950. Limiting plate; 960. Second spring; 970. Cam; 971. Blade. Detailed Implementation

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0019] Please see Figure 1 , Figure 2 and Figure 3 This invention discloses an automatic welding equipment for a semi-trailer main frame, used for welding the main longitudinal beam 110 and the secondary longitudinal beam 130 in the main frame 100. The equipment includes a placement frame 200, a transverse movement unit 400, a longitudinal movement unit 500, a pressing unit 600, a guiding unit 700, and a welding unit 800. The transverse movement unit 400 is movably mounted on the placement frame 200 and can move laterally relative to the placement frame 200. The longitudinal movement unit 500 is movably mounted on the transverse movement unit 400 and can move longitudinally relative to the transverse movement unit 400. Please see Figure 5 and Figure 6The pressing unit 600 is disposed on the longitudinal moving unit 500 and includes a top pressing roller 670 adapted to the upper end face of the secondary longitudinal beam 130 and a side pressing roller 680 adapted to the side wall of the secondary longitudinal beam 130. Please see Figure 7 and Figure 8 The welding unit 800 is disposed on the longitudinal movement unit 500 and includes a welding torch 810. The bottom of the welding torch 810 is provided with a welding torch head 820 corresponding to the V-groove 140. The guide unit 700 is disposed on the pressing unit 600 and is used to guide the welding torch head 820 according to the extension path of the V-groove 140. Specifically, the secondary longitudinal beam 130 is first placed on the transverse moving unit 400, and then the main longitudinal beam 110 is placed on the placement frame 200. The secondary longitudinal beam 130 is driven to move laterally by the transverse moving unit 400 until the secondary longitudinal beam 130 is in contact with the main longitudinal beam 110 on the same side. Before welding, the drive pressing unit 600 moves downward until the top pressure roller 670 contacts the top surface of the secondary longitudinal beam 130, and at the same time the side pressure roller 680 contacts the side wall of the secondary longitudinal beam 130. The top pressure roller 670 applies downward pressure to the secondary longitudinal beam 130, and the side pressure roller 680 applies lateral extrusion force to the secondary longitudinal beam 130, thereby preventing the secondary longitudinal beam 130 from warping, ensuring the straightness of the secondary longitudinal beam 130, and avoiding misalignment between the secondary longitudinal beam 130 and the main longitudinal beam 110. During welding, the welding torch 810 is turned on, and the welding torch head 820 is used to weld the V-groove 140 between the secondary longitudinal beam 130 and the main longitudinal beam 110. At the same time, the longitudinal movement unit 500 drives the welding torch 810 to feed at a constant speed along the V-groove 140. During the feeding process of the welding torch 810, the welding torch head 820 is guided by the guide unit 700 so that the welding torch head 820 always moves along the extension path of the V-groove 140, so as to avoid the welding torch head 820 from deviating from the V-groove 140 and affecting the alignment of the weld.

[0020] It should be noted that the transverse unit 400 drives the secondary longitudinal beam 130 to move laterally, ensuring that it is precisely fitted with the main longitudinal beam 110; the top pressure roller 670 of the pressing unit 600 applies vertical downward pressure to the secondary longitudinal beam 130, and the side pressure roller 680 applies lateral extrusion pressure. The dual action effectively suppresses the warping deformation of the secondary longitudinal beam 130 during the welding process, ensuring the straightness and relative position accuracy of the assembly of the main longitudinal beam 110 and the secondary longitudinal beam 130, and avoiding misalignment. The guiding unit 700 guides the welding torch head 820 in real time based on the extension path of the V-groove 140 of the secondary longitudinal beam 130, ensuring that the welding torch head 820 always moves along the predetermined trajectory during the welding process and preventing deviation; combined with the longitudinal movement unit 500 driving the welding torch 810 to feed at a uniform speed, it effectively improves the centering and continuity of the V-groove 140 weld and ensures the consistency of welding quality.

[0021] In one embodiment, please refer to Figure 3 and Figure 4 The transverse unit 400 includes a transverse slide rail 410 horizontally fixed on the placement frame 200 and a transverse bracket 430 slidably mounted on the transverse slide rail 410. The transverse bracket 430 is provided with a transverse slide table 420 that is slidably adapted to the transverse slide rail 410. The bottom of the placement frame 200 is provided with a transverse cylinder (not shown in the figure) for driving the transverse bracket 430. Further, please refer to Figure 3 and Figure 4 The longitudinal movement unit 500 includes a longitudinal movement groove 510 longitudinally opened on the transverse bracket 430 and a longitudinal movement slide table 520 slidably embedded in the longitudinal movement groove 510. A longitudinal movement screw 530 is rotatably installed in the longitudinal movement groove 510. The longitudinal movement screw 530 is threadedly connected to the longitudinal movement slide table 520. A longitudinal movement motor 540 for driving the longitudinal movement screw 530 is also installed at one end of the transverse bracket 430. Specifically, the transverse slide rail 410 and the transverse slide table 420 constitute a rigid guiding system to ensure that the transverse bracket 430 moves laterally in a straight line when carrying the secondary longitudinal beam 130, avoiding deviation; the transverse cylinder drives the transverse slide table 420 to realize the automated transverse feeding of the secondary longitudinal beam 130, so that it can quickly and accurately fit with the main longitudinal beam 110, providing an initial positioning reference for subsequent pressing and straightening. The threaded transmission mechanism of the longitudinal lead screw 530 and the longitudinal slide table 520 precisely controls the displacement and speed through the longitudinal motor 540, driving the welding torch 810 to move at a uniform speed along the longitudinal slide 510, ensuring the trajectory stability and speed consistency of the welding torch head 820 during the welding process of the V-groove 140, eliminating weld fluctuations, and improving welding quality.

[0022] Furthermore, please refer to Figure 1 and Figure 2 It also includes a lifting unit 300 disposed on the placement frame 200. The lifting unit 300 includes a lifting cylinder 310 and a fixing plate 320 that are vertically fixedly installed on the lifting unit 300. The output end of the lifting cylinder 310 is connected to the lifting plate 330. A lifting guide rod 340 that movably passes through the fixing plate 320 is vertically installed on the lifting plate 330. Specifically, after the main longitudinal beam 110 and the secondary longitudinal beam 130 are welded together, the lifting cylinder 310 drives the lifting plate 330 to lift upwards, so that the entire main frame 100 can be lifted off the placement frame 200 by the lifting plate 330, which facilitates the subsequent transfer of the main frame 100.

[0023] In yet another embodiment, please refer to Figure 5 and Figure 6The pressing unit 600 further includes a lifting cylinder 610 vertically mounted on the longitudinal moving unit 500 and an L-shaped bracket 640 movably disposed below the longitudinal moving unit 500. The output end of the lifting cylinder 610 is connected to a vertical slider 620, and a lifting guide rod 630 that slides through the longitudinal moving unit 500 is vertically fixed on the vertical slider 620. The L-shaped bracket 640 is provided with a vertical sliding groove 641 and a horizontal sliding groove 642. The vertical slider 620 is vertically slidably embedded in the vertical sliding groove 641, and a horizontal slider 650 is horizontally slidably embedded in the horizontal sliding groove 642. A connecting frame 651 is fixed on the horizontal slider 650, and a connecting rod 660 is hinged between the vertical slider 620 and the horizontal slider 650. The top pressure roller 670 is rotatably mounted on the bottom of the L-shaped bracket 640, and the side pressure roller 680 is rotatably mounted on the connecting frame 651. Specifically, in the initial state, the output end of the lifting cylinder 610 retracts, at which time the vertical slider 620 is located at the upper end of the vertical slide 641. Under the transmission of the connecting rod 660, the horizontal slider 650 is located on the side of the horizontal slide 642 close to the secondary longitudinal beam 130. The entire L-shaped bracket 640 is in a suspended state, and neither the top pressure roller 670 nor the side pressure roller 680 is in contact with the secondary longitudinal beam 130. After the secondary longitudinal beam 130 and the main longitudinal beam 110 are initially in contact, the lifting cylinder 610 drives the vertical slider 620 downward, which in turn drives the L-shaped bracket 640 downward until the top pressure roller 670 is in contact with the top surface of the secondary longitudinal beam 130. Then, the lifting cylinder 610 drives the vertical slider 620 to continue downward. At this time, because the secondary longitudinal beam 130 restricts the top pressure roller 670, the L-shaped bracket 640 cannot continue to move downward, thus forcing the vertical slider 620 to begin sliding downward along the vertical slide groove 641. Then, under the transmission of the connecting rod 660, it drives the lateral... The slider 650 slides horizontally along the transverse groove 642 toward the side away from the secondary longitudinal beam 130, thereby driving the side pressure roller 680 on the connecting frame 651 to gradually approach the side wall of the secondary longitudinal beam 130 until the side pressure roller 680 is in contact with the side wall of the secondary longitudinal beam 130. In this way, the top pressure roller 670 can be used to press the top of the secondary longitudinal beam 130, and the side pressure roller 680 can be used to press the side wall of the secondary longitudinal beam 130, thereby preventing the secondary longitudinal beam 130 from warping and deforming vertically and laterally, and ensuring the straightness of the secondary longitudinal beam 130 and the main longitudinal beam 110.

[0024] It should be noted that when the lifting cylinder 610 drives the vertical slider 620 to move downward, the L-shaped bracket 640 drives the top pressure roller 670 to contact the top surface of the secondary longitudinal beam 130 first, forming a vertical downward pressure. After the top pressure roller 670 is limited by the workpiece, the vertical slider 620 continues to move downward and slides along the vertical slide groove 641. Through the connecting rod 660, it pushes the horizontal slider 650 to move horizontally outward along the horizontal slide groove 642, which drives the side pressure roller 680 to automatically fit against the side wall of the secondary longitudinal beam 130, realizing the synchronous loading of lateral extrusion pressure. A single cylinder can complete the coordinated application of vertical and horizontal bidirectional pressure, avoiding warping or lateral displacement of the secondary longitudinal beam 130. The vertical slide 641 and the horizontal slide 642 constitute a rigid guide system, which ensures that the movement trajectory of the vertical slider 620 and the horizontal slider 650 is strictly limited. The hinge design of the connecting rod 660 converts the vertical displacement into the horizontal displacement. After the top pressure roller 670 touches the top, the side pressure roller 680 is forcibly triggered to move, eliminating the risk of pressure interference and ensuring that the secondary longitudinal beam 130 is subjected to balanced force. Both the top pressure roller 670 and the side pressure roller 680 are rotated and can roll along the surface of the secondary longitudinal beam 130 during the welding feed process, continuously applying stable pressure. The combination of bidirectional pressure effectively counteracts the vertical bending and lateral twisting caused by welding thermal deformation, ensuring that the secondary longitudinal beam 130 and the main longitudinal beam 110 are in close contact throughout the process.

[0025] Further, please refer to Figure 6 A transverse guide rod 643 is horizontally fixed inside the transverse slide groove 642. The transverse slider 650 moves through the transverse guide rod 643. A first spring 644 is movably sleeved on the transverse guide rod 643. The first spring 644 is located on the side of the transverse slider 650 away from the secondary longitudinal beam 130. Specifically, when the transverse slider 650 slides along the transverse groove 642 toward the side away from the secondary longitudinal beam 130, it can compress the first spring 644, thereby causing the first spring 644 to gradually store energy. When the welding is completed, the lifting cylinder 610 drives the vertical slider 620 to rise. Under the elastic force of the first spring 644, the horizontal slider 650 is first driven to slide along the horizontal groove 642 toward the side of the secondary longitudinal beam 130, thereby causing the side pressure roller 680 to separate from the side wall of the secondary longitudinal beam 130. Until the horizontal slider 650 slides to the initial position, under the transmission of the connecting rod 660, the vertical slider 620 also slides to the upper end of the vertical groove 641. Then the lifting cylinder 610 drives the vertical slider 620 to continue to rise, which can drive the L-shaped bracket 640 to rise synchronously, causing the top pressure roller 670 to separate from the top of the secondary longitudinal beam 130.

[0026] It should be noted that the first spring 644 is pre-pressed on the side of the transverse slider 650 away from the secondary longitudinal beam 130 to form a reserve of reset elastic force. When the lifting cylinder 610 rises, the first spring 644 releases its elastic force first, pushing the transverse slider 650 to slide along the transverse guide rod 643 toward the side of the secondary longitudinal beam 130, and immediately driving the side pressure roller 680 to disengage from the side wall of the secondary longitudinal beam 130. This avoids the side pressure roller 680 from hard friction with the side wall of the secondary longitudinal beam 130 due to thermal expansion and contraction of the workpiece after welding or residual stress, and prevents surface scratches or structural disturbance. During the reset process of the side pressure roller 680, the connecting rod 660 pulls the vertical slider 620 to slide up along the vertical slide groove 641 to the initial position. After the horizontal slider 650 is fully reset, the lifting cylinder 610 continues to lift the vertical slider 620, driving the L-shaped bracket 640 to rise as a whole, so that the top pressure roller 670 is separated from the top surface of the secondary longitudinal beam 130. After the lateral constraint is released, the vertical pressure is still maintained briefly to ensure the stability of the workpiece posture.

[0027] Furthermore, please refer to Figure 5 and Figure 7 The guiding unit 700 includes two sets of transverse guide rails 710 horizontally fixed to the bottom of the L-shaped bracket 640. A transverse slide table 720 is slidably embedded in the transverse guide rail 710. A through groove 721 is opened in the transverse slide table 721. A swing frame 730 is movably inserted in the through groove 721. The welding unit 800 is installed in the middle of the swing frame 730. A strip-shaped slide groove 731 is symmetrically opened at both ends of the swing frame 730. A locking pin 722 adapted to the corresponding strip-shaped slide groove 731 is provided in the through groove 721. A rotating frame 740 is rotatably installed at both ends of the swing frame 730. A guide roller 750 is rotatably installed at the bottom of the rotating frame 740. Specifically, when the top pressure roller 670 at the bottom of the L-shaped bracket 640 contacts the top surface of the secondary longitudinal beam 130, the two sets of guide rollers 750 are also just embedded in the V-shaped groove 140, and the rotating frame 740 can rotate around the Z-axis relative to the swing frame 730, so that the guide rollers 750 can flexibly turn along the V-shaped groove 140. When the extension path of the V-groove 140 deviates slightly, it can drive the corresponding guide roller 750 to deflect synchronously, thereby causing the transverse slide 720 to slide laterally adaptively along the transverse guide rail 710. At the same time, the swing frame 730 also deflects at a certain angle within the through groove 721. In this way, during the welding process of the welding unit 800, the guide rollers 750 at both ends can roll adaptively following the extension path of the V-groove 140, thereby causing the swing frame 730 to deflect adaptively as a whole. This ensures that the welding torch head 820 in the welding unit 800 is always directly above the current V-groove 140, preventing the welding torch head 820 from deviating from the V-groove 140 and affecting the centering and welding strength of the weld.

[0028] It should be noted that the two sets of guide rollers 750 are embedded in the V-groove 140, and through the Z-axis rotation function of the rotating frame 740, they adapt to the horizontal turning changes of the V-groove 140 in real time; the transverse slide 720 slides along the transverse guide rail 710, responding to the transverse offset of the V-groove 140; the swing frame 730 achieves angle deflection through the cooperation of the strip groove 731 and the locking pin 722, compensating for the angle deviation of the V-groove 140; the welding gun head 820 is always dynamically aligned with the V-groove 140 during the welding process, eliminating the weld skewing caused by path offset; The slight offset of the V-groove 140 pushes the guide roller 750 to deflect, thereby driving the rotating frame 740 to rotate, which in turn causes the swing frame 730 to deflect and the transverse slide 720 to slide, thereby driving the welding torch head 820 to move synchronously, achieving zero-delay trajectory correction and ensuring weld continuity and alignment. The locking pin 722 limits the swing range of the strip groove 731 to prevent excessive deflection. The rotation design of the rotating frame 740 and the swing frame 730 ensures both the sensitivity of the correction and avoids the mechanical structure from jamming due to overload.

[0029] In further embodiments, please refer to Figure 5 and Figure 8 It also includes a cleaning unit 900 disposed on the guide unit 700, the cleaning unit 900 including an air tube 910 and an air nozzle 920 disposed below the air tube 910; Specifically, during the welding process, compressed air is connected to the air pipe 910, so that the compressed air is sprayed out from the air nozzle 920 to blow away the welding slag and dust generated during the welding process, ensuring the cleanliness of the V-groove 140 and the entire main frame 100.

[0030] Further, please refer to Figure 8 Considering that the weld slag formed during welding usually adheres to the outside of the weld and cannot be blown away by the airflow, the cleaning unit 900 also includes a lifting rod 930 that is vertically slidably installed on the guide unit 700. The lower end of the lifting rod 930 is equipped with a vibrating block 940 that is adapted to the V-groove 140. The top end of the lifting rod 930 is provided with a limiting plate 950. The upper end of the lifting rod 930 is movably sleeved with a second spring 960 that abuts against the limiting plate 950. Specifically, during the welding process, by periodically pushing the limiting plate 950 downward, in conjunction with the elastic force of the second spring 960, the lifting rod 930 can be driven to move up and down reciprocally, thereby realizing the reciprocating vibration and tapping of the vibrating block 940 on the V-groove 140, so as to break up the weld slag skin attached to the weld seam formed by welding, and make it easier for compressed air to blow the weld slag skin away from the main frame 100.

[0031] Furthermore, please refer to Figure 9The trachea 910 is rotatably mounted on the outside of the trachea 910 and is adapted to the limiting plate 950. The trachea 910 is movably disposed inside the trachea 910 and is fixedly connected to the cam 970 on the same axis. Specifically, when the air tube 910 continuously flows through the inside of the air tube 910, it can drive the blade 971 to rotate synchronously, thereby driving the cam 970 to rotate circumferentially. The cam 970 can then periodically press down on the limiting plate 950. In conjunction with the second spring 960, the vibrating block 940 can reciprocate to knock the surface of the welding slag inside the V-groove 140.

[0032] It should be noted that the air nozzle 920 sprays compressed air to immediately remove loose welding slag and dust inside the V-groove 140, ensuring a clean welding field of view; the vibrating block 940 periodically taps the weld surface of the V-groove 140 to break up the stubborn welding slag skin, solving the problem of hard deposits that the airflow cannot remove, thus effectively treating welding slag with different adhesion strengths and achieving deep cleaning of the weld surface. When compressed air flows through the air pipe 910, it drives the blade 971 to rotate, and the linkage cam 970 rotates synchronously, periodically pressing down the limit plate 950. The second spring 960 provides a reset force after the cam 970 disengages from the limit plate 950, causing the lifting rod 930 to drive the vibrating block 940 to reciprocate at high frequency. It directly uses the energy of the cleaning airflow to drive the vibration action, without the need for an additional power source, thus achieving energy-saving and fully automatic operation. The tapping action of the vibratory block 940 is synchronized with the blowing action of the air nozzle 920. The vibration breaks up the surface of the welding slag, which is instantly blown away from the weld area by the airflow. The vertical sliding design of the lifting rod 930 ensures that the vibratory block 940 accurately and vertically taps the V-groove 140, avoiding skew damage to the weld. The cleaning action and the welding process are seamlessly coordinated, improving the efficiency of continuous operation.

[0033] The specific embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention, all of which are within the protection scope of the present invention.

Claims

1. An automatic welding equipment for the main frame of a semi-trailer, characterized in that, The assembly and welding of the main longitudinal beams (110) and secondary longitudinal beams (130) in the main frame (100) includes: Placement rack (200) for placing main longitudinal beam (110); A transverse unit (400), which is movably mounted on a placement frame (200) and can move laterally relative to the placement frame (200), is used to place the secondary longitudinal beam (130). The longitudinal moving unit (500) is movably mounted on the transverse moving unit (400) and can move longitudinally relative to the transverse moving unit (400); The pressing unit (600) is disposed on the longitudinal moving unit (500) and includes a top pressing roller (670) adapted to the upper end face of the sub-longitudinal beam (130) and a side pressing roller (680) adapted to the side wall of the sub-longitudinal beam (130). Welding unit (800), which is disposed on longitudinal unit (500), includes welding torch (810), the bottom of welding torch (810) is provided with welding torch head (820) corresponding to V-groove (140) between main longitudinal beam (110) and secondary longitudinal beam (130). A guide unit (700), which is disposed on the pressing unit (600), is used to guide the welding torch head (820) according to the extension path of the V-groove (140).

2. The automatic welding equipment for the main frame of a semi-trailer according to claim 1, characterized in that, The transverse unit (400) includes a transverse slide rail (410) horizontally fixed on the placement frame (200) and a transverse bracket (430) slidably mounted on the transverse slide rail (410). The transverse bracket (430) is provided with a transverse slide table (420) that is slidably adapted to the transverse slide rail (410). The bottom of the placement frame (200) is provided with a transverse cylinder for driving the transverse bracket (430).

3. The automatic welding equipment for the main frame of a semi-trailer according to claim 2, characterized in that, The longitudinal movement unit (500) includes a longitudinal movement groove (510) longitudinally opened on the transverse bracket (430) and a longitudinal movement slide (520) slidably embedded in the longitudinal movement groove (510). A longitudinal movement screw (530) is rotatably installed in the longitudinal movement groove (510). The longitudinal movement screw (530) is threadedly connected to the longitudinal movement slide (520). A longitudinal movement motor (540) for driving the longitudinal movement screw (530) is also installed at one end of the transverse bracket (430).

4. The automatic welding equipment for the main frame of a semi-trailer according to claim 1, characterized in that, It also includes a lifting unit (300) mounted on a placement frame (200). The lifting unit (300) includes a lifting cylinder (310) and a fixing plate (320) that are vertically fixed on the lifting unit (300). The output end of the lifting cylinder (310) is connected to a lifting plate (330). A lifting guide rod (340) that movably passes through the fixing plate (320) is vertically mounted on the lifting plate (330).

5. The automatic welding equipment for the main frame of a semi-trailer according to claim 1, characterized in that, The pressing unit (600) also includes a lifting cylinder (610) vertically mounted on the longitudinal moving unit (500) and an L-shaped bracket (640) movably disposed below the longitudinal moving unit (500). The output end of the lifting cylinder (610) is connected to a vertical slider (620), and a lifting guide rod (630) that slides through the longitudinal moving unit (500) is vertically fixed on the vertical slider (620). The L-shaped bracket (640) is provided with a vertical slide groove (641) and a horizontal slide groove (642). The vertical slider (620) is vertically slidably embedded in the vertical slide groove (641). The horizontal slider (650) is horizontally slidably embedded in the horizontal slide groove (642). A connecting frame (651) is fixed on the horizontal slider (650). A connecting rod (660) is hinged between the vertical slider (620) and the horizontal slider (650). The top pressure roller (670) is rotatably installed on the bottom of the L-shaped bracket (640), and the side pressure roller (680) is rotatably installed on the connecting frame (651).

6. The automatic welding equipment for the main frame of a semi-trailer according to claim 5, characterized in that, A horizontal guide rod (643) is fixed horizontally inside the transverse slide groove (642). The transverse slider (650) moves through the transverse guide rod (643). A first spring (644) is movably sleeved on the transverse guide rod (643). The first spring (644) is located on the side of the transverse slider (650) away from the secondary longitudinal beam (130).

7. The automatic welding equipment for semi-trailer main frame according to claim 5, characterized in that, The guiding unit (700) includes two sets of transverse guide rails (710) horizontally fixed to the bottom of the L-shaped bracket (640). A transverse slide table (720) is slidably embedded in the transverse guide rail (710). A through groove (721) is opened in the transverse slide table (720). A swing frame (730) is movably inserted in the through groove (721). The welding unit (800) is installed in the middle of the swing frame (730). A strip-shaped slide groove (731) is symmetrically opened at both ends of the swing frame (730). A locking pin (722) adapted to the corresponding strip-shaped slide groove (731) is provided in the through groove (721). A rotating frame (740) is rotatably installed at both ends of the swing frame (730). A guide roller (750) is rotatably installed at the bottom of the rotating frame (740).

8. The automatic welding equipment for the main frame of a semi-trailer according to claim 1, characterized in that, It also includes a cleaning unit (900) disposed on the guide unit (700), the cleaning unit (900) including an air tube (910) and an air nozzle (920) disposed below the air tube (910).

9. The automatic welding equipment for the main frame of a semi-trailer according to claim 8, characterized in that, The cleaning unit (900) also includes a lifting rod (930) that is vertically slidably installed on the guide unit (700). The lower end of the lifting rod (930) is equipped with a vibrating block (940) that is adapted to the V-groove (140). The top end of the lifting rod (930) is provided with a limiting plate (950). The upper end of the lifting rod (930) is movably sleeved with a second spring (960) that abuts against the limiting plate (950).

10. The automatic welding equipment for the main frame of a semi-trailer according to claim 9, characterized in that, A cam (970) adapted to a limiting plate (950) is rotatably mounted on the outside of the trachea (910), and a blade (971) coaxially and fixedly connected to the cam (970) is movably arranged inside the trachea (910).

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