A semi-trailer body longitudinal beam positioning and welding device

Abstract

The application discloses a semi-trailer compartment body longitudinal beam positioning and welding device and belongs to the field of longitudinal beam welding devices.The device comprises a base, first electric sliding rails are fixedly connected to the front and back sides of the top of the base, a moving frame is slidably connected to the surface of the first electric sliding rails, a second electric sliding rail is fixedly connected to the top of the moving frame, a welding head is slidably connected to the inside of the second electric sliding rail, a conveying assembly is fixedly connected to the middle of the top of the base, and a polishing assembly is arranged on one side of the top of the base.The device effectively removes rust and oxidation layers on both sides of the web through the guiding wheel limiting feeding and the biaxial synchronous driving polishing wheel, is favorable for improving the fusion effect of the base material, and thus improves the mechanical properties of the weld to a certain extent and reduces the probability of pores and cracks;simultaneously, the gear reduction cam mechanism drives the polishing wheel to reciprocatingly swing up and down, avoids local eccentric grinding of the grinding wheel, and prolongs the stable and reliable rust removal effect.

Description

Technical Field

[0001] This invention relates to the field of longitudinal beam welding equipment, and more specifically, to a positioning welding equipment for the longitudinal beams of a semi-trailer body. Background Technology

[0002] The longitudinal beams of a semi-trailer are an important component of the semi-trailer frame, bearing various impact loads and complex moments during the semi-trailer's operation. A longitudinal beam typically consists of two flanges and a web. The web is vertically positioned between the two parallel flanges, and the web is welded to the flanges, thus forming an I-beam shape after the longitudinal beam is welded.

[0003] During the longitudinal beam welding process, welding fixtures are typically used to clamp and position the flange and web. Then, manual spot welding is performed at the connection between the flange and web to complete the longitudinal beam assembly. Finally, the longitudinal beam is placed on the robotic welding workbench for clamping, and the welding robot performs full welding at the connection between the flange and web.

[0004] During the rolling, open-air storage, cutting, and transportation of raw steel plates, a dense hot-rolled oxide scale, yellow rust, surface rust, cutting slag, and edge burrs will form on the surface. Some plates may also be contaminated with rolling oil and residual protective film. If thorough grinding and rust removal are not performed before welding, welding defects such as slag inclusions and porosity are likely to occur. The oxide scale and rust layer decompose under the high temperature of the electric arc to produce hydrogen gas, making the weld prone to porosity, slag inclusions, and hydrogen-induced cooling cracks. Rust and debris hinder the metallurgical bonding of the molten pool, resulting in incomplete fusion of the weld and a decrease in mechanical strength. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide a semi-trailer body longitudinal beam positioning and welding equipment.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A semi-trailer body longitudinal beam positioning and welding equipment includes a base, a first electric slide rail is fixedly connected to the front and rear sides of the top of the base, a movable frame is slidably connected to the surface of the first electric slide rail, a second electric slide rail is fixedly connected to the top of the movable frame, a welding head is slidably connected inside the second electric slide rail, a conveying assembly is fixedly connected to the middle of the top of the base, and a grinding component is provided on one side of the top of the base. The grinding assembly includes a U-shaped frame fixed to the top of the base. Guide wheels are symmetrically rotatably connected to both sides of the top of the U-shaped frame. A dual-axis motor is fixedly connected to the middle of the top of the U-shaped frame. A transmission shaft is fixedly connected to the output end of the dual-axis motor. A first bevel gear is fixedly connected to one side of the transmission shaft. A spline shaft is rotatably connected to the other side of the top of the U-shaped frame. A second bevel gear is fixedly connected to the top of the spline shaft. A transmission sleeve is slidably fitted on the outer surface of the spline shaft. A grinding wheel is fixedly connected to the outer surface of the transmission sleeve. A shifting assembly is provided on one side inside the U-shaped frame. The shifting assembly is connected to the grinding wheel.

[0008] Furthermore, the top of the spline shaft extends through the interior of the U-shaped frame, the first bevel gear and the second bevel gear mesh with each other, and the distance between the two grinding wheels is the same as the distance between the two guide wheels.

[0009] Furthermore, the switching component includes a movable frame that slides on the front and rear sides inside the U-shaped frame, a first fixed plate fixed on the front and rear sides of the top of the U-shaped frame, and a first gear fixed on the outer surface of the transmission shaft. The bottom of the movable frame is fixedly connected to an annular groove, and a replacement component is slidably connected inside the annular groove. A second gear is rotatably connected to one side of the first fixed plate, and a cam is fixedly connected to one side of the second gear. A contact rod is fixedly connected to the top of one side of the movable frame, and return springs are fixedly connected to both sides of the bottom of the movable frame. The top of the return springs is fixedly connected to the top of the U-shaped frame.

[0010] Furthermore, the first gear and the second gear mesh with each other, the contact rod is in contact with the surface of the cam, the bottom of the moving frame extends into the interior of the U-shaped frame, and the transmission shaft passes through the interior of the first fixed plate and is connected to each other by bearings.

[0011] Furthermore, the replacement component includes two rotating rods slidably connected inside an annular groove. A limit ring is fixedly connected to the bottom of the outer surface of the rotating rod. An internal threaded sleeve is slidably connected to the outer surface of the rotating rod. An annular groove is formed on the inner surface of the internal threaded sleeve. A threaded post is threadedly connected to the inner thread of the internal threaded sleeve.

[0012] Furthermore, the bottom of the threaded column is fixedly connected to the top of the grinding wheel, and the limiting ring is located inside the annular groove and slides against it.

[0013] Furthermore, alignment components are provided on both sides of the conveying assembly. The alignment components include two second fixing plates fixed on both sides of the conveying assembly and a servo motor in the middle of one side of the conveying assembly. The output end of the servo motor is fixedly connected to a bidirectional threaded rod. An internal threaded plate is threadedly connected to the outer surface of the bidirectional threaded rod. A clamping plate is fixedly connected to the top of the two internal threaded plates. A threaded rod is rotatably connected to one side of the two clamping plates. A moving plate is threadedly connected to the outer surface of the threaded rod. Release components are provided at both ends of one side of the moving plate. An L-shaped clamping plate is provided on the release components.

[0014] Furthermore, the two ends of one side of the abutment plate are provided with limiting slide rods, and one side of the limiting slide rods penetrates the interior of the second fixed plate and slides against each other. The abutment plate is located above the conveying assembly, and the internal thread plate is located between the two rotating rollers on the conveying assembly.

[0015] Furthermore, the release assembly includes fixed sleeve blocks fixed to both ends of one side of the movable plate and a hinge rod rotating at the middle of the top of the abutment plate. A telescopic rod is slidably connected inside the fixed sleeve block, and a connecting rod is fixedly connected to the bottom of the two telescopic rods. A first spring is sleeved on the outer surface of the telescopic rod, and an abutment frame is fixedly connected to the middle of the top of the connecting rod.

[0016] Furthermore, a groove is provided in the middle of the top of the clamping frame, the hinge rod is adapted to the groove, the two ends of the first spring are fixedly connected to the fixed sleeve block and the connecting rod respectively, and the top of the telescopic rod is fixedly connected to the L-shaped card plate.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This device effectively removes rust and oxide layers from both sides of the main beam by using guide wheel limit feeding and dual-axis synchronous drive of the grinding wheel. This helps improve the fusion effect of the base material, thereby improving the mechanical properties of the weld to a certain extent and reducing the probability of porosity and cracks. At the same time, the gear reduction cam mechanism drives the grinding wheel to swing back and forth, avoiding local uneven wear of the grinding wheel that leads to a decrease in grinding depth. The rust removal effect is stable and reliable in the long term.

[0018] 2. This device uses a cam to drive the grinding wheel to oscillate periodically, increasing the effective grinding surface, balancing wheel wear, and significantly extending the grinding wheel's service life. The replacement components use an internal threaded sleeve and threaded column locking structure, allowing for quick disassembly and assembly of the grinding wheel simply by tightening the internal threaded sleeve, eliminating the need to disassemble a large number of auxiliary parts. This results in high equipment maintenance and replacement efficiency, reducing consumable and labor maintenance costs.

[0019] 3. This device relies on an adjustable L-shaped clamping plate with a threaded rod to adapt to wing plates of different thicknesses. A servo motor drives a bidirectional threaded rod to achieve synchronous centering and clamping on both sides, ensuring high fitting accuracy between the web plate and the wing plate and guaranteeing consistent welding dimensions. After welding, pressing the clamping frame releases the hinge rod, and the first spring quickly lifts the L-shaped clamping plate, which releases synchronously with the clamping plate, instantly releasing all constraints on the workpiece. The web plate can then be directly removed from the conveyor assembly. The positioning, welding, and unloading processes are seamless, significantly improving the overall production cycle of welding the semi-trailer longitudinal beams. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the grinding component structure of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the grinding component structure of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the transposition component structure of the present invention; Figure 5 This is a schematic diagram of the replacement component structure of the present invention; Figure 6 This is a schematic diagram of the alignment component structure of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the alignment component structure of the present invention. Figure 2 ; Figure 8 This is a schematic diagram of the release component structure of the present invention.

[0021] Explanation of the labels in the diagram: 1. Base; 2. First electric slide rail; 3. Moving frame; 4. Welding head; 5. Grinding assembly; 51. U-shaped frame; 52. Guide wheel; 53. Dual-axis motor; 54. Drive shaft; 55. Transposition assembly; 551. First fixed plate; 552. Cam; 553. First gear; 554. Second gear; 555. Moving frame; 556. Annular groove; 557. Replacement component; 5571. Rotating rod; 5572. Internal threaded sleeve; 5573. Annular groove; 5574. Limiting ring; 5575. Threaded post; 558. Contact rod; 559. Return spring; 56. First bevel gear; 57. Second bevel gear; 58. Grinding wheel; 59. Transmission sleeve; 510. Splined shaft; 6. Alignment assembly; 61. Second fixing plate; 62. Servo motor; 63. Clamping plate; 64. Threaded rod; 65. Moving plate; 66. L-shaped clamping plate; 67. Release assembly; 671. Fixing sleeve; 672. Telescopic rod; 673. First spring; 674. Connecting rod; 675. Clamping frame; 676. Hinge rod; 68. Double-threaded rod; 69. Internally threaded plate; 7. Conveyor assembly; 8. Second electric slide rail. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1 to 8 A semi-trailer body longitudinal beam positioning welding equipment includes a base 1, a first electric slide rail 2 fixedly connected to the front and rear sides of the top of the base 1, a movable frame 3 slidably connected to the surface of the first electric slide rail 2, a second electric slide rail 8 fixedly connected to the top of the movable frame 3, a welding head 4 slidably connected inside the second electric slide rail 8, a conveying assembly 7 fixedly connected to the middle of the top of the base 1, and a grinding component 5 provided on one side of the top of the base 1. like Figures 2-4 As shown, the grinding assembly 5 includes a U-shaped frame 51 fixed to the top of the base 1. Guide wheels 52 are symmetrically rotatably connected to both sides of the top of the U-shaped frame 51. A dual-axis motor 53 is fixedly connected to the middle of the top of the U-shaped frame 51. A transmission shaft 54 ​​is fixedly connected to the output end of the dual-axis motor 53. A first bevel gear 56 is fixedly connected to one side of the transmission shaft 54. A spline shaft 510 is rotatably connected to the other side of the top of the U-shaped frame 51. A second bevel gear 57 is fixedly connected to the top of the spline shaft 510. A transmission sleeve 59 is slidably fitted on the outer surface of the spline shaft 510. A grinding wheel 58 is fixedly connected to the outer surface of the transmission sleeve 59. A shifting assembly 55 is provided on one side inside the U-shaped frame 51. The shifting assembly 55 is connected to the grinding wheel 58.

[0024] The top of the spline shaft 510 extends through the interior of the U-shaped frame 51. The first bevel gear 56 and the second bevel gear 57 mesh with each other. The distance between the two grinding wheels 58 is the same as the distance between the two guide wheels 52.

[0025] Before welding, the web plate needs to be pre-treated to remove rust and oxide layers from both sides. The web plate is then passed through two guide wheels 52, which guide and limit its movement. Simultaneously, a dual-axis motor 53 is activated to drive two transmission shafts 54 to rotate synchronously. The transmission shafts 54 drive the second bevel gear 57 to rotate synchronously via the first bevel gear 56. The second bevel gear 57 drives the spline shaft 510 to rotate. The spline shaft 510 drives the grinding wheel 58 to rotate at high speed via the transmission sleeve 59. When both sides of the web plate reach the grinding wheel 58, the web plate moves at a constant speed under the action of external driving force. The grinding wheel 58 grinds the rust and oxide layers on both sides of the web plate. After cleaning, the plates are fully bonded, and the mechanical strength and impact toughness of the weld are greatly improved, reducing the risk of latent fracture of the load-bearing weld.

[0026] like Figures 3-4 As shown, the switching component 55 includes a movable frame 555 that slides on the front and rear sides inside the U-shaped frame 51, a first fixed plate 551 fixed on the front and rear sides of the top of the U-shaped frame 51, and a first gear 553 fixed on the outer surface of the transmission shaft 54. An annular groove 556 is fixedly connected to the bottom of the movable frame 555, and a replacement component 557 is slidably connected inside the annular groove 556. A second gear 554 is rotatably connected to one side of the first fixed plate 551, and a cam 552 is fixedly connected to one side of the second gear 554. A contact rod 558 is fixedly connected to the top of one side of the movable frame 555. Return springs 559 are fixedly connected to both sides of the bottom inside the movable frame 555, and the top of the return springs 559 is fixedly connected to the top inside the U-shaped frame 51.

[0027] The first gear 553 and the second gear 554 mesh with each other, the contact rod 558 and the surface of the cam 552 are in contact with each other, the bottom of the moving frame 555 extends into the interior of the U-shaped frame 51, and the drive shaft 54 ​​passes through the interior of the first fixed plate 551 and the connection is connected to each other by bearings.

[0028] When grinding both sides of the web, the horizontal height of the grinding wheel 58 remains constant, resulting in a fixed contact area between the grinding wheel 58 and the web. Furthermore, as the outer periphery of the contact area wears down, its diameter decreases, preventing automatic compensation of the grinding depth. This leads to a gradual decrease in grinding volume, substandard rust removal in the later stages, and a reduced lifespan for the grinding wheel 58. To address this, while the grinding wheel 58 is working, the drive shaft 54 ​​synchronously drives the first gear 553 to rotate. The diameter of the first gear 553 is smaller than that of the second gear 554, causing the second gear 554 to rotate slowly. The second gear 554 drives the cam 552 to rotate at a constant speed. The contact rod 558 moves from the closest end to the farthest end on the surface of the cam 552, pushing the contact rod 558 upwards. This causes the moving frame 555 and the annular slide groove 556 to move upwards as a whole. The annular slide groove 556 can be moved upwards by replacing the assembly. The component 557 drives the grinding wheel 58 to move upward. As the cam 552 continues to rotate, it moves from the farthest end to the nearest end. Under the combined action of the gravity of the grinding wheel 58 and the elastic force of the return spring 559 fixed between the bottom of the moving frame 555 and the top wall of the U-shaped frame, it automatically falls down. This can realize the up and down movement compensation of the grinding wheel 58 during grinding, widen the grinding area of ​​the grinding wheel 58, avoid continuous grinding of local areas of the grinding wheel 58, avoid substandard rust removal in the later stage, and effectively improve the service life of the grinding wheel 58.

[0029] like Figure 5 As shown, the replacement component 557 includes two rotating rods 5571 that are slidably connected inside the annular groove 556. A limit ring 5574 is fixedly connected to the bottom of the outer surface of the rotating rod 5571. An internal threaded sleeve 5572 is slidably connected to the outer surface of the rotating rod 5571. An annular groove 5573 is opened on the inner surface of the internal threaded sleeve 5572. A threaded post 5575 is threadedly connected to the inside of the internal threaded sleeve 5572.

[0030] The bottom of the threaded post 5575 is fixedly connected to the top of the grinding wheel 58, and the limiting ring 5574 is located inside the annular groove 5573 and slides against it.

[0031] After a certain period of use, the outer diameter of the grinding wheel 58 decreases, making it unable to effectively remove the rust oxide layer. The grinding wheel 58 needs to be replaced. At this time, rotate the inner threaded sleeve 5572 so that the inner threaded sleeve 5572 moves upward outside the rotating rod 5571 until the inner threaded sleeve 5572 is completely removed from the outside of the threaded post 5575, thus disengaging the threaded post 5575. At this time, the grinding wheel 58 can be removed as a whole, allowing for quick disassembly and assembly of the grinding wheel 58.

[0032] like Figures 6-8As shown, alignment components 6 are provided on both sides of the conveying assembly 7. The alignment components 6 include two second fixing plates 61 fixed on both sides of the conveying assembly 7 and a servo motor 62 in the middle of one side of the conveying assembly 7. The output end of the servo motor 62 is fixedly connected to a bidirectional threaded rod 68. The outer surface of the bidirectional threaded rod 68 is threadedly connected to an internal threaded plate 69. The top of the two internal threaded plates 69 is fixedly connected to a clamping plate 63. One side of the two clamping plates 63 is rotatably connected to a threaded rod 64. The outer surface of the threaded rod 64 is threadedly connected to a moving plate 65. The two ends of one side of the moving plate 65 are provided with release components 67. The release components 67 are provided with an L-shaped clamping plate 66.

[0033] Limiting slide rods are provided at both ends of one side of the clamping plate 63, and one side of the limiting slide rods passes through the interior of the second fixed plate 61 and slides against each other. The clamping plate 63 is located above the conveying assembly 7, and the internal thread plate 69 is located between the two rotating rollers on the conveying assembly 7.

[0034] like Figure 8 As shown, the release assembly 67 includes a fixed sleeve block 671 fixed at both ends of one side of the movable plate 65 and a hinge rod 676 rotatably located at the middle of the top of the abutment plate 63. A telescopic rod 672 is slidably connected inside the fixed sleeve block 671. A connecting rod 674 is fixedly connected to the bottom of the two telescopic rods 672. A first spring 673 is sleeved on the outer surface of the telescopic rod 672. A abutment frame 675 is fixedly connected to the middle of the top of the connecting rod 674.

[0035] A groove is provided in the middle of the top of the clamping frame 675. The hinge rod 676 is adapted to the groove. The first spring 673 is located between the fixed sleeve block 671 and the connecting rod 674. The top of the telescopic rod 672 is fixedly connected to the L-shaped card plate 66.

[0036] When welding the web and wing plates, they need to be aligned and fixed. At this time, the distance between the L-shaped clamping plate 66 and the abutment plate 63 is adjusted. The threaded rod 64 is rotated to move the moving plate 65. The moving plate 65 moves the L-shaped clamping plate 66 through the release component 67. The distance between the L-shaped clamping plate 66 and the abutment plate 63 is adjusted to match the thickness of the wing plate. After adjustment, the wing plate is inserted from top to bottom between the two L-shaped clamping plates 66. Then, the servo motor 62 is started to drive the bidirectional threaded rod 68 to rotate. Through the thread action, the two internal threaded plates 69 and the abutment plate 63 move closer to each other, and the two wing plates move closer to the sides of the web and make tight contact. At this time, the welding head 4 can be started to weld the connection between the web and the wing plate, so as to quickly complete the positioning and fixing of the web and the wing plate.

[0037] After welding is completed, the welded web plate needs to be removed. At this time, the L-shaped clamping plate 66 is released from its fixation. Pressing down on the clamping frame 675 causes the connecting rod 674 to move downward as a whole, so that the hinge rod 676 disengages from the inside of the groove. Rotating the hinge rod 676 causes it to move away from the top of the clamping frame 675. At this time, under the thrust of the two first springs 673, the telescopic rod 672 is pushed upward quickly, thereby causing the two L-shaped clamping plates 66 to move upward synchronously, so that the L-shaped clamping plates 66 are moved away from one side of the wing plate. Then, the servo motor 62 rotates the bidirectional threaded rod 68 in the opposite direction to drive the two clamping plates 63 away from each other, releasing the clamping plates 63 from fixing the wing plate. At this time, the web plate can be removed from the conveying assembly 7, thus quickly releasing the fixation of the web plate.

[0038] Instructions for use: Before welding, both sides of the web plate must be pre-treated to remove rust and oxide layers. The web plate passes through guide wheels 52 for guidance and positioning. The dual-axis motor 53 drives the transmission shaft 54 ​​to rotate synchronously, which in turn drives the grinding wheel 58 to rotate at high speed via the first bevel gear 56, the second bevel gear 57, the spline shaft 510, and the transmission sleeve 59. During the uniform feeding of the web plate, the grinding wheel 58 thoroughly grinds and cleans the rust and oxide layers on both sides, optimizing the fit of the plates, improving the mechanical strength and impact toughness of the weld, and avoiding the risk of hidden fracture of the load-bearing weld.

[0039] Traditional fixed-height grinding wheels 58 have a constant contact area, which easily leads to localized and continuous wear on the wheel body, wheel diameter reduction, and inability to compensate for grinding depth, resulting in substandard rust removal and a short equipment lifespan. During operation, this equipment uses a drive shaft 54 ​​to drive a small-diameter first gear 553, which in turn drives a large-diameter second gear 554 and a cam 552 to rotate at a low and uniform speed. The cam 552 pushes the contact rod 558, the moving frame 555, the annular slide groove 556, and the replacement component 557 to move the grinding wheel 58 upwards. After the cam 552 continues to rotate, the grinding wheel 58 falls back down due to its own weight. This reciprocating up-and-down oscillation of the grinding wheel 58 expands the grinding coverage area, avoids concentrated localized wear, stabilizes rust removal quality, and effectively extends the service life of the grinding wheel 58.

[0040] After long-term wear, the rust removal performance of the grinding wheel 58 decreases, and it needs to be replaced in time. Rotate the internal threaded sleeve 5572 so that it moves upward along the rotating rod 5571 and disengages from the threaded post 5575, thereby releasing the locking limit. This allows for quick disassembly and replacement of the grinding wheel 58, making disassembly and maintenance convenient and efficient.

[0041] Precise positioning and clamping are required before welding the web and flange. Rotating the threaded rod 64 moves the moving plate 65. The distance between the L-shaped clamping plate 66 and the abutment plate 63 is adjusted by the release component 67 to match the flange thickness. The flange is placed between the two sets of L-shaped clamping plates 66. The servo motor 62 is started to drive the bidirectional threaded rod 68 to rotate, causing the internal threaded plate 69 to move closer to the abutment plate 63, so that the flange and web are tightly fitted. Finally, the welding head 4 is started to complete the butt welding, realizing rapid positioning and welding of the workpiece.

[0042] After welding, the material can be quickly unlocked and unloaded. Press down on the clamping frame 675 to move the connecting rod 674 down, causing the hinge rod 676 to disengage from the slot and rotate to avoid it; the first spring 673 pushes the telescopic rod 672 up, causing the L-shaped clamping plate 66 to rise and disengage from the wing plate; the servo motor 62 drives the bidirectional threaded rod 68 in the opposite direction, causing the clamping plate 63 to loosen its limit, and the web plate can be removed from the conveying assembly 7 to complete the unloading.

[0043] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A semi-trailer body longitudinal beam positioning welding equipment, comprising a base (1), wherein a first electric slide rail (2) is fixedly connected to the front and rear sides of the top of the base (1), a movable frame (3) is slidably connected to the surface of the first electric slide rail (2), a second electric slide rail (8) is fixedly connected to the top of the movable frame (3), a welding head (4) is slidably connected inside the second electric slide rail (8), and a conveying assembly (7) is fixedly connected to the middle of the top of the base (1); Its features are: A polishing component (5) is provided on one side of the top of the base (1); The grinding assembly (5) includes a U-shaped frame (51) fixed to the top of the base (1). Guide wheels (52) are symmetrically rotatably connected to the top two sides of the U-shaped frame (51). A dual-axis motor (53) is fixedly connected to the middle of the top of the U-shaped frame (51). A transmission shaft (54) is fixedly connected to the output end of the dual-axis motor (53). A first bevel gear (56) is fixedly connected to one side of the transmission shaft (54). A spline shaft (510) is rotatably connected to the other side of the top of the U-shaped frame (51). A second bevel gear (57) is fixedly connected to the top of the spline shaft (510). A transmission sleeve (59) is slidably fitted on the outer surface of the spline shaft (510). A grinding wheel (58) is fixedly connected to the outer surface of the transmission sleeve (59). A shifting assembly (55) is provided on one side inside the U-shaped frame (51). The shifting assembly (55) is connected to the grinding wheel (58).

2. The semi-trailer body longitudinal beam positioning and welding equipment according to claim 1, characterized in that: The top of the spline shaft (510) extends through the interior of the U-shaped frame (51), the first bevel gear (56) and the second bevel gear (57) mesh with each other, and the distance between the two grinding wheels (58) is the same as the distance between the two guide wheels (52).

3. The semi-trailer body longitudinal beam positioning and welding equipment according to claim 2, characterized in that: The shifting assembly (55) includes a movable frame (555) that slides on the front and rear sides inside the U-shaped frame (51), a first fixed plate (551) fixed on the front and rear sides of the top of the U-shaped frame (51), and a first gear (553) fixed on the outer surface of the transmission shaft (54). The bottom of the movable frame (555) is fixedly connected to an annular groove (556), and a replacement assembly (557) is slidably connected inside the annular groove (556). A second gear (554) is rotatably connected to one side of the first fixed plate (551), and a cam (552) is fixedly connected to one side of the second gear (554). A contact rod (558) is fixedly connected to the top of one side of the movable frame (555), and return springs (559) are fixedly connected to both sides of the bottom inside the movable frame (555). The top of the return springs (559) is fixedly connected to the top inside the U-shaped frame (51).

4. The semi-trailer body longitudinal beam positioning and welding equipment according to claim 3, characterized in that: The first gear (553) and the second gear (554) mesh with each other, the contact rod (558) and the surface of the cam (552) are in contact with each other, the bottom of the moving frame (555) extends into the interior of the U-shaped frame (51), and the drive shaft (54) passes through the interior of the first fixed plate (551) and the connection is connected to each other by bearings.

5. The semi-trailer body longitudinal beam positioning and welding equipment according to claim 4, characterized in that: The replacement component (557) includes two rotating rods (5571) slidably connected inside an annular groove (556). A limit ring (5574) is fixedly connected to the bottom of the outer surface of the rotating rod (5571). An internal threaded sleeve (5572) is slidably connected to the outer surface of the rotating rod (5571). An annular groove (5573) is opened on the inner surface of the internal threaded sleeve (5572). A threaded post (5575) is threadedly connected to the inside of the internal threaded sleeve (5572).

6. The semi-trailer body longitudinal beam positioning and welding equipment according to claim 5, characterized in that: The bottom of the threaded post (5575) is fixedly connected to the top of the grinding wheel (58), and the limiting ring (5574) is located inside the annular groove (5573) and slides against it.

7. The semi-trailer body longitudinal beam positioning and welding equipment according to claim 1, characterized in that: Alignment components (6) are provided on both sides of the conveying assembly (7). The alignment components (6) include two second fixing plates (61) fixed on both sides of the conveying assembly (7) and a servo motor (62) in the middle of one side of the conveying assembly (7). The output end of the servo motor (62) is fixedly connected to a bidirectional threaded rod (68). The outer surface of the bidirectional threaded rod (68) is threadedly connected to an inner threaded plate (69). The top of the two inner threaded plates (69) is fixedly connected to a clamping plate (63). The side of the two clamping plates (63) is rotatably connected to a threaded rod (64). The outer surface of the threaded rod (64) is threadedly connected to a moving plate (65). The two ends of one side of the moving plate (65) are provided with release components (67). The release components (67) are provided with an L-shaped clamping plate (66).

8. The semi-trailer body longitudinal beam positioning and welding equipment according to claim 7, characterized in that: The two ends of one side of the abutment plate (63) are provided with limiting slide rods, and one side of the limiting slide rods passes through the interior of the second fixed plate (61) and slides against each other. The abutment plate (63) is located above the conveying assembly (7), and the internal thread plate (69) is located between the two rotating rollers on the conveying assembly (7).

9. The semi-trailer body longitudinal beam positioning and welding equipment according to claim 8, characterized in that: The release assembly (67) includes a fixed sleeve (671) fixed at both ends of one side of the movable plate (65) and a hinge rod (676) rotatably located at the middle of the top of the abutment plate (63). A telescopic rod (672) is slidably connected inside the fixed sleeve (671). A connecting rod (674) is fixedly connected to the bottom of the two telescopic rods (672). A first spring (673) is sleeved on the outer surface of the telescopic rod (672). A abutment frame (675) is fixedly connected to the middle of the top of the connecting rod (674).

10. The semi-trailer body longitudinal beam positioning and welding equipment according to claim 9, characterized in that: The top of the clamping frame (675) has a groove in the middle, the hinge rod (676) is adapted to the groove, the two ends of the first spring (673) are fixedly connected to the fixed sleeve block (671) and the connecting rod (674) respectively, and the top of the telescopic rod (672) is fixedly connected to the L-shaped card plate (66).

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