A welding device for bridge guardrail

Abstract

The present invention discloses a welding device for bridge guardrails, belonging to the technical field of guardrail welding, comprising two support plates, a movable connecting plate is arranged on one side of the support plate, a deburring assembly is arranged on the top of the connecting plate, and a limiting assembly is arranged on the bottom of the deburring assembly. In the present invention, a rotating tube cooperates with a limiting slider and a limiting slide groove to drive a moving rod to rotate, and the moving rod drives a grinding brush to rotate, so that the grinding brush grinds and polishes the welding part between the longitudinal rod and the cross rod of the guardrail during the movement, reduces burrs, improves the smoothness of the welding part, makes the welding part evenly stressed in all directions and not easy to break, and improves the quality of the finished product. At the same time, the mounting seat and the moving rod are arranged so that the moving rod can be adjusted as the height of the second screw seat is adjusted, so as to realize the adaptability of the grinding brush to guardrails of different specifications, and improve the applicability of the equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of guardrail welding, and in particular relates to welding equipment for bridge guardrails. Background Art

[0002] Bridge guardrails refer to guardrails installed on bridges. Their purpose is to prevent out-of-control vehicles from going over the bridge. They have the function of preventing vehicles from breaking through, passing under, or climbing over the bridge, as well as beautifying the bridge structure. This type of guardrail is mostly produced by welding.

[0003] The invention patent with publication number CN117961352B discloses a road guardrail welding device, which belongs to the field of guardrail welding, and includes legs, wherein the number of the legs is two groups and they are parallelly distributed on the left and right sides, and a lifting assembly is arranged on the upper side of the legs, and the lifting assembly includes a support plate 1 fixedly connected to the outer surface of the upper end of the left leg, and a support plate 2 is fixedly connected to the outer surface of the upper end of the right leg, and the support plate 1 and the support plate 2 are both L-shaped structures, and a clamping assembly is arranged on the upper side of the support plate 2, and the clamping assembly includes a hydraulic rod fixedly connected to the support plate 2, which can achieve that before welding the road guardrail, by adjusting the spacing between adjacent fixing seats, the spacing between the two rectangular materials can be flexibly adjusted through the fixing seats, which can not only meet the processing requirements of road guardrails of different sizes, but also keep the spacing between the two adjacent groups of fixing seats consistent, thereby greatly improving the functionality and flexibility of the guardrail welding device, but in the actual welding process, the welding part of the guardrail is uneven, which easily causes uneven force on the welding part, thereby affecting the quality of welding. Summary of the invention

[0004] The purpose of the present invention is to propose a welding device for bridge guardrails in order to solve the problem that the welding part of the guardrail is uneven, which easily causes uneven force on the welding part and thus affects the quality of welding.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A welding device for a bridge guardrail comprises two support plates, a movable connecting plate is arranged on one side of the support plate, a deburring assembly is arranged on the top of the connecting plate, a limit assembly is arranged on the bottom of the deburring assembly, and two turning over assemblies for turning over the guardrail are arranged between the two support plates;

[0007] The deburring assembly includes two movable connecting boxes, one side of the connecting box is connected to a first mounting block, a rotating tube is rotatably connected in the first mounting block, a driven wheel is connected to the top of the rotating tube, the top of the connecting box is rotatably connected to a driving wheel through a rotating shaft, a transmission belt is transmitted between the driving wheel and the driven wheel, a driving gear is connected to the outer surface of the rotating shaft, one side of the driving gear is meshedly connected to a fixed rack, both sides of the top of the connecting plate are connected to fixed plates, a moving rod is slidably connected to the bottom of the rotating tube, and a grinding brush is connected to the bottom of the moving rod. When the connecting box moves, the driving gear and the fixed rack cooperate to drive the grinding brush to grind the guardrail welding point to make the welding point smooth and flat.

[0008] As a further description of the above technical solution:

[0009] The fixed rack is connected between the two fixed plates, and two movable screws are rotatably connected between the two fixed plates. The two movable screws are fixedly connected, the two movable screws are symmetrically distributed along the center position, and the thread directions of the two movable screws are opposite. The outer surface of the movable screw is threadedly connected to a first screw seat, the top of the first screw seat is connected to the bottom of the connecting box, a driving motor is connected to one side of the fixed plate, and one end of the output shaft of the driving motor extends to the other side of the fixed plate and is connected to one end of one of the movable screws.

[0010] As a further description of the above technical solution:

[0011] Both sides of the bottom of the rotating tube are connected to limit sliding blocks, and both sides of the moving rod are provided with limit sliding grooves, and the limit sliding blocks are slidably connected in the limit sliding grooves.

[0012] As a further description of the above technical solution:

[0013] The limiting assembly includes two sleeves, which are rotatably connected in a connecting box, a third bevel gear is connected to an outer surface of the sleeve, one side of the third bevel gear is meshedly connected to a second bevel gear, one side of the second bevel gear is connected to a connecting shaft, a side of the connecting shaft away from the second bevel gear is connected to the first bevel gear, one side of the bottom of the first bevel gear is meshedly connected to a fourth bevel gear, an adjusting screw is connected to the bottom of the fourth bevel gear, one end of the adjusting screw extends to the outside of the connecting box, the outer surface of the adjusting screw is threadedly connected to a second screw seat, and the bottom of the second screw seat is connected to an extrusion wheel for fitting into the top of the guardrail and limiting the guardrail.

[0014] As a further description of the above technical solution:

[0015] The outer surface of the connecting shaft is rotatably connected with a mounting piece, and the mounting piece is connected to the bottom of the inner wall of the connecting box. Fixed sliding rods are connected to both sides of the bottom of the connecting box. The two fixed sliding rods are symmetrically distributed on both sides of the adjusting screw. Sliding holes are opened on both sides of the top of the second screw seat. The fixed sliding rod is slidably connected to the sliding holes. A mounting seat is connected to one side of the second screw seat, and the mounting seat is rotatably connected to the moving rod.

[0016] As a further description of the above technical solution:

[0017] A rotating rod is slidably connected inside the sleeve, and the cross-sectional shapes of the rotating rod and the inner wall of the sleeve are both regular hexagons. The rotating rod is rotatably connected between the two fixed plates.

[0018] As a further description of the above technical solution:

[0019] The flip assembly includes a fixed ring, one side of the fixed ring is rotatably connected to a rotating gear ring, two mounting rods are arranged inside the rotating gear ring in a mirror-symmetrical manner, one side of the mounting rod is connected to two electric push rods, the other end of the electric push rod is connected to the inner side of the rotating gear ring, both sides of the mounting rod are connected to limiting slide bars, the other end of the limiting slide bar is slidably connected to a clamping block, the end of the clamping block away from the limiting slide bar is connected to a fitting wheel, and one side of the fitting wheel fits with the inner wall of the rotating gear ring.

[0020] As a further description of the above technical solution:

[0021] A return spring is sleeved on the outer surface of the limit sliding rod, and two ends of the return spring are respectively connected to one side of the mounting rod and one side of the clamping block.

[0022] As a further description of the above technical solution:

[0023] Mounting blocks are connected to both sides of the fixing ring, one side of the mounting blocks is connected to one side of the support plate, one side of the top of one of the mounting blocks is connected to a flip motor through the mounting plate, one end of the flip motor output end is connected to a transmission gear, and one side of the transmission gear is meshed with a rotating gear ring.

[0024] As a further description of the above technical solution:

[0025] The bottoms of the two support plates are connected to the same base plate, movable modules are arranged on both sides of the top of the base plate, an adjustment module is connected between the tops of the two movable modules, a welding gun body is arranged on one side of the adjustment module, a plurality of driving cylinders are connected to one side of the support plate, the other end of the driving cylinder is connected to one side of the connecting plate, and a placement plate is connected to the bottom of the connecting plate.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0027] 1. In the present invention, by setting a burr removal component, after welding is completed, the driving motor drives the rotating tube to rotate through the moving screw, the first screw seat, the connecting box, the driving gear, the fixed rack, the active wheel, the transmission belt and the driven wheel, and the rotating tube cooperates with the limiting slider and the limiting slide groove to drive the moving rod to rotate, and the moving rod drives the grinding brush to rotate, so that the grinding brush grinds and polishes the welding joints between the longitudinal rod and the cross rod of the guardrail during the movement, thereby reducing burrs and improving the smoothness of the welding joints, making the welding joints evenly stressed in all directions and not easy to break, thereby improving the quality of the finished product. At the same time, the mounting seat and the moving rod are arranged so that the moving rod can be adjusted as the height of the second screw seat is adjusted, thereby realizing the adaptability of the grinding brush to guardrails of different specifications and improving the applicability of the equipment.

[0028] 2. In the present invention, by setting a limit assembly, the rotating rod drives the adjusting screw to rotate through the sleeve, the third bevel gear, the second bevel gear, the first bevel gear and the fourth bevel gear, and the adjusting screw drives the extrusion wheel to move downward through the second screw seat, so that the extrusion wheel cooperates with the placement plate to limit the cross bar of the guardrail, thereby avoiding the cross bar of the guardrail from moving during the welding process, improving the stability of the guardrail welding, and thus improving the quality and effect of the finished product of the guardrail welding. At the same time, the movable screw rotates under the drive of the driving motor, which can drive the first screw seat to move, the second screw seat drives the connecting box to move, and the connecting box drives the extrusion wheel to move, which can change the limiting position of the extrusion wheel on the cross bar of the guardrail, avoid interference with the welding gun, and improve the flexibility of the equipment.

[0029] 3. In the present invention, by setting a flipping assembly, the electric push rod moves through the mounting rod, the limit sliding rod, the clamping block and the fitting wheel, and the two clamping blocks close to each other clamp the cross bars of the two guardrails. After that, the staff releases the limit of the guardrail by the limit assembly and moves the connecting plate away from the guardrail. The flipping motor is started, and the transmission gear drives the rotating gear ring to rotate 180 degrees, so that the guardrail is flipped as a whole, realizing automatic flipping of the guardrail, improving the degree of automation, and improving welding efficiency. At the same time, the clamping block that can be telescopically moved can be suitable for guardrails of different sizes, thereby improving the applicability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0031] Figure 2 It is a top view of the three-dimensional structure of the present invention;

[0032] Figure 3 It is a schematic diagram of a partially exploded three-dimensional structure of the present invention;

[0033] Figure 4 It is a schematic diagram of the three-dimensional structure of the deburring assembly and the limiting assembly of the present invention;

[0034] Figure 5 For the present invention Figure 4 The enlarged structural diagram of part A in the middle;

[0035] Figure 6 It is a partial three-dimensional structural schematic diagram of the limiting assembly of the present invention;

[0036] Figure 7 It is a partial three-dimensional structural schematic diagram of the deburring assembly of the present invention;

[0037] Figure 8 It is a schematic diagram of the three-dimensional structure of the flip assembly of the present invention.

[0038] Legend:

[0039] 1. Base plate; 2. Mobile module; 3. Support plate; 4. Turnover assembly; 401. Fixed ring; 402. Mounting block; 403. Turnover motor; 404. Transmission gear; 405. Rotating gear ring; 406. Electric push rod; 407. Mounting rod; 408. Limiting slide rod; 409. Reset spring; 410. Clamping block; 411. Fitting wheel; 5. Deburring assembly; 501. Fixed rack; 502. Driving wheel; 503. Driving motor; 504. Connection box; 505. First screw seat; 506. Moving screw; 507. Transmission belt; 508. Driving wheel; 509, rotating tube; 510, limiting slider; 511, limiting slide groove; 512, moving rod; 513, grinding brush; 514, driving gear; 6, adjustment module; 7, welding gun body; 8, limiting assembly; 801, rotating rod; 802, fixed slide rod; 803, second screw seat; 804, extrusion wheel; 805, adjusting screw; 806, first bevel gear; 807, connecting shaft; 808, second bevel gear; 809, third bevel gear; 810, sleeve; 811, fourth bevel gear; 9, placement plate; 10, connecting plate; 11, driving cylinder. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-Figure 8 , the present invention provides a technical solution:

[0042] A welding device for a bridge guardrail comprises two support plates 3, a movable connecting plate 10 is arranged on one side of the support plate 3, a burr removal assembly 5 is arranged on the top of the connecting plate 10, a limit assembly 8 is arranged on the bottom of the burr removal assembly 5, and two flipping assemblies 4 for flipping the guardrail are arranged between the two support plates 3, the bottoms of the two support plates 3 are connected to the same base plate 1, both sides of the top of the base plate 1 are arranged with movable modules 2, an adjustment module 6 is connected between the tops of the two movable modules 2, a welding gun body 7 is arranged on one side of the adjustment module 6, a plurality of driving cylinders 11 are connected to one side of the support plate 3, the other end of the driving cylinder 11 is connected to one side of the connecting plate 10, and a placement plate 9 is connected to the bottom of the connecting plate 10.

[0043] The deburring assembly 5 includes two movable connecting boxes 504, one side of the connecting box 504 is connected to a first mounting block, a rotating tube 509 is rotatably connected in the first mounting block, a driven wheel 508 is connected to the top of the rotating tube 509, the top of the connecting box 504 is rotatably connected to the driving wheel 502 through a rotating shaft, a transmission belt 507 is connected between the driving wheel 502 and the driven wheel 508, a driving gear 514 is connected to the outer surface of the rotating shaft, one side of the driving gear 514 is meshedly connected to a fixed rack 501, both sides of the top of the connecting plate 10 are connected to fixed plates, a moving rod 512 is slidably connected to the bottom of the rotating tube 509, and a grinding brush 513 is connected to the bottom of the moving rod 512. When the connecting box 504 moves, the driving gear 514 cooperates with the fixed rack 501 to drive the grinding brush 513 to grind the guardrail welding position The welding part is smooth and flat, the fixed rack 501 is connected between the two fixed plates, and there are two movable screws 506 rotatably connected between the two fixed plates, the two movable screws 506 are fixedly connected, the two movable screws 506 are symmetrically distributed along the center position, and the thread directions of the two movable screws 506 are opposite, the outer surface of the movable screw 506 is threadedly connected with a first screw seat 505, the top of the first screw seat 505 is connected to the bottom of the connecting box 504, a driving motor 503 is connected to one side of the fixed plate, one end of the output shaft of the driving motor 503 extends to the other side of the fixed plate and is connected to one end of one of the movable screws 506, both sides of the bottom of the rotating tube 509 are connected to limit sliders 510, and both sides of the moving rod 512 are provided with limit slide grooves 511, and the limit slider 510 is slidably connected in the limit slide grooves 511.

[0044] The specific implementation method is as follows: by setting the burr removal component 5, after welding is completed, the driving motor 503 drives the rotating tube 509 to rotate through the moving screw 506, the first screw seat 505, the connecting box 504, the driving gear 514, the fixed rack 501, the driving wheel 502, the transmission belt 507 and the driven wheel 508, and the rotating tube 509 cooperates with the limiting slider 510 and the limiting slide groove 511 to drive the moving rod 512 to rotate, and the moving rod 512 drives the grinding brush 513 to rotate, so that the grinding brush 513 grinds and polishes the welding point between the longitudinal rod and the cross rod of the guardrail during the movement, thereby reducing burrs, improving the smoothness of the welding point, and improving the quality of the finished product.

[0045] The limiting assembly 8 includes two sleeves 810, which are rotatably connected to the connecting box 504. The outer surface of the sleeve 810 is connected to a third bevel gear 809, one side of the third bevel gear 809 is meshedly connected to the second bevel gear 808, one side of the second bevel gear 808 is connected to a connecting shaft 807, and the side of the connecting shaft 807 away from the second bevel gear 808 is connected to the first bevel gear 806, and the bottom side of the first bevel gear 806 is meshedly connected to the fourth bevel gear 811, and the bottom of the fourth bevel gear 811 is connected to an adjusting screw 805, one end of the adjusting screw 805 extends to the outside of the connecting box 504, the outer surface of the adjusting screw 805 is threadedly connected to the second screw seat 803, and the bottom of the second screw seat 803 is connected to an extrusion screw. The pressure wheel 804 is used to fit the top of the guardrail and limit the guardrail. The outer surface of the connecting shaft 807 is rotatably connected to a mounting piece, and the mounting piece is connected to the bottom of the inner wall of the connecting box 504. Both sides of the bottom of the connecting box 504 are connected to fixed slide rods 802. The two fixed slide rods 802 are symmetrically distributed on both sides of the adjustment screw 805. Sliding holes are opened on both sides of the top of the second screw seat 803. The fixed slide rod 802 is slidably connected in the sliding holes. A mounting seat is connected to one side of the second screw seat 803, and the mounting seat is rotatably connected to the moving rod 512. A rotating rod 801 is slidably connected in the sleeve 810. The cross-sectional shapes of the rotating rod 801 and the inner wall of the sleeve 810 are both regular hexagons, and the rotating rod 801 is rotatably connected between the two fixed plates.

[0046] The specific implementation method is as follows: by setting a limit assembly 8, the rotating rod 801 drives the adjusting screw 805 to rotate through the sleeve 810, the third bevel gear 809, the second bevel gear 808, the first bevel gear 806 and the fourth bevel gear 811, and the adjusting screw 805 drives the extrusion wheel 804 to move downward through the second screw seat 803, so that the extrusion wheel 804 cooperates with the placement plate 9 to limit the cross bar of the guardrail, thereby preventing the cross bar of the guardrail from moving during the welding process, improving the stability of the guardrail welding, and thus improving the quality and effect of the finished product of the guardrail welding. At the same time, the movable screw 506 rotates under the drive of the driving motor 503, which can drive the first screw seat 505 to move, the second screw seat 803 drives the connecting box 504 to move, and the connecting box 504 drives the extrusion wheel 804 to move, which can change the extrusion wheel 804 The cross bar limit position of the guardrail.

[0047] The flip assembly 4 includes a fixed ring 401, one side of the fixed ring 401 is rotatably connected to a rotating gear ring 405, the rotating gear ring 405 has two mounting rods 407 arranged inside in a mirror-symmetrical manner, one side of the mounting rod 407 is connected to two electric push rods 406, the other end of the electric push rod 406 is connected to the inner side of the rotating gear ring 405, both sides of the mounting rod 407 are connected to limit slide rods 408, the other end of the limit slide rod 408 is slidably connected to a clamping block 410, the end of the clamping block 410 away from the limit slide rod 408 is connected to a fitting wheel 411, and the fitting wheel 411 1, one side is in contact with the inner wall of the rotating gear ring 405, a reset spring 409 is sleeved on the outer surface of the limiting slide rod 408, and both ends of the reset spring 409 are respectively connected to one side of the mounting rod 407 and one side of the clamping block 410, and both sides of the fixing ring 401 are connected to the mounting blocks 402, and one side of the mounting blocks 402 is connected to one side of the supporting plate 3, and one side of the top of one of the mounting blocks 402 is connected to the flip motor 403 through the mounting plate, and one end of the output end of the flip motor 403 is connected to the transmission gear 404, and one side of the transmission gear 404 is meshed with the rotating gear ring 405.

[0048] The specific implementation method is as follows: by setting the flipping component 4, the electric push rod 406 moves through the installation rod 407, the limit slide rod 408, the clamping block 410 and the fitting wheel 411, and the two clamping blocks 410 close to each other clamp the cross bars of the two guardrails. After that, the staff releases the limit of the guardrail by the limit component 8 and moves the connecting plate 10 away from the guardrail. The flipping motor 403 is started, and the transmission gear 404 drives the rotating gear ring 405 to rotate 180 degrees, so that the guardrail is flipped as a whole, realizing automatic flipping of the guardrail and improving the degree of automation.

[0049] Working principle: When in use, the staff adjusts the distance between the two connecting plates 10 according to the actual size of the bridge guardrail, and drives the cylinder 11 to drive the two connecting plates 10 to move closer or farther away from each other. After completing the adjustment of the distance between the two connecting plates 10, the staff passes the cross bar of the guardrail through the two clamping blocks 410 and places the cross bar of the guardrail on the placement plate 9, and makes one side of the cross bar of the guardrail fit with one side of the connecting plate 10. After that, the staff rotates the turntable, which drives the rotating rod 801 to rotate, and the rotating rod 801 drives the sleeve 810 to rotate, and the sleeve The cylinder 810 drives the third bevel gear 809 to rotate, the third bevel gear 809 drives the second bevel gear 808 to rotate, the second bevel gear 808 drives the first bevel gear 806 to rotate through the connecting shaft 807, the first chasing bevel gear drives the fourth bevel gear 811 to rotate, the fourth bevel gear 811 drives the adjusting screw 805 to rotate, the adjusting screw 805 drives the second screw seat 803 to move downward, the second screw seat 803 drives the extruding wheel 804 to move downward, the extruding wheel 804 fits against the cross bar of the guardrail, and cooperates with the placement plate 9 to limit the cross bar of the guardrail.

[0050] After completing the limit of the horizontal bar of the guardrail, the staff will place the cut longitudinal bars of the guardrail equidistantly between the horizontal bars of the two guardrails, and the two ends of the longitudinal bars of the guardrail are respectively located on the placement plate 9. At this time, the moving module 2 and the adjustment module 6 cooperate with each other and drive the welding gun body 7 to weld the contact between the longitudinal bar of the guardrail and the horizontal bar of the guardrail. After the welding is completed, the driving motor 503 is started, and the driving motor 503 drives the two moving screws 506 to rotate, and the moving screw 506 drives the first screw seat 505 to move relatively, and the first screw seat 505 drives the connecting box 504 to move, and the connecting box 504 drives The driving gear 514 moves on the fixed rack 501, and the driving gear 514 rotates driven by the fixed rack 501. The driving gear 514 drives the driving wheel 502 to rotate. The driving wheel 502 drives the driven wheel 508 to rotate through the transmission belt 507. The driven wheel 508 drives the rotating tube 509 to rotate. The rotating tube 509 cooperates with the limiting slider 510 and the limiting slide groove 511 to drive the moving rod 512 to rotate. The moving rod 512 drives the grinding brush 513 to rotate, so that the grinding brush 513 grinds and polishes the welding joints between the longitudinal rod and the horizontal rod of the guardrail during the movement.

[0051] After completing the welding and grinding of the welding point on one side, the electric push rod 406 drives the installation rod 407 to move to the center position, so that the installation rod 407 drives the limiting slide rod 408, the clamping block 410 and the fitting wheel 411 to move. During this process, the fitting wheel 411 is always in contact with the inner wall of the rotating gear ring 405, and the reset spring 409 drives the clamping block 410 to move to both sides. At the same time, the two clamping blocks 410 close to each other clamp the cross bars of the two guardrails. After completing this step, the staff flips the rotating turntable so that the limiting assembly 8 releases the limit on the cross bar of the guardrail. After that, the driving cylinder 11 drives the connecting plate 10 away from the cross bar of the guardrail. After that, the flipping motor 403 is started, and the flipping motor 403 drives the transmission gear 404 to rotate, and the transmission gear 404 drives the rotating gear ring 405 to rotate 180 degrees, so that the guardrail is flipped as a whole. After that, the driving cylinder 11 drives the connecting plate 10 back to its original position, and repeats the previous steps to perform welding operations on the reverse side of the guardrail.

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A welding device for bridge guardrail, comprising two support plates (3), characterized in that: A movable connecting plate (10) is provided on one side of the supporting plate (3), a deburring assembly (5) is provided on the top of the connecting plate (10), a limiting assembly (8) is provided on the bottom of the deburring assembly (5), and two flipping assemblies (4) for flipping the guardrail are provided between the two supporting plates (3), a plurality of driving cylinders (11) are connected to one side of the supporting plate (3), the other end of the driving cylinder (11) is connected to one side of the connecting plate (10), and a placement plate (9) is connected to the bottom of the connecting plate (10); The deburring assembly (5) comprises two movable connection boxes (504), one side of the connection box (504) is connected to a first mounting block, a rotating tube (509) is rotatably connected inside the first mounting block, a driven wheel (508) is connected to the top of the rotating tube (509), a driving wheel (502) is rotatably connected to the top of the connection box (504) via a rotating shaft, a transmission belt (507) is connected between the driving wheel (502) and the driven wheel (508), a driving gear (514) is connected to the outer surface of the rotating shaft, one side of the driving gear (514) is meshedly connected to a fixed rack (501), both sides of the top of the connection plate (10) are connected to fixed plates, a moving rod (512) is slidably connected to the bottom of the rotating tube (509), a grinding brush (513) is connected to the bottom of the moving rod (512), and the connection box (504) is movable. When the guardrail welding part is polished, the polishing brush (513) is driven to polish the guardrail welding part through the cooperation of the driving gear (514) and the fixed rack (501), so that the welding part is smooth and flat. The fixed rack (501) is connected between the two fixed plates, and two movable lead screws (506) are rotatably connected between the two fixed plates. The two movable lead screws (506) are fixedly connected to each other, and the two movable lead screws (506) are symmetrically distributed along the center position, and the thread directions of the two movable lead screws (506) are opposite. The outer surface of the movable lead screw (506) is threadedly connected to a first lead screw seat (505), and the top of the first lead screw seat (505) is connected to the bottom of the connection box (504). A driving motor (503) is connected to one side of the fixed plate, and one end of the output shaft of the driving motor (503) extends to the other side of the fixed plate and is connected to one end of one of the movable lead screws (506); The limiting assembly (8) comprises two sleeves (810), wherein the sleeves (810) are rotatably connected in the connection box (504), and the outer surface of the sleeve (810) is connected to a third bevel gear (809), one side of the third bevel gear (809) is meshingly connected to the second bevel gear (808), one side of the second bevel gear (808) is connected to a connecting shaft (807), the side of the connecting shaft (807) away from the second bevel gear (808) is connected to the first bevel gear (806), the bottom side of the first bevel gear (806) is meshingly connected to a fourth bevel gear (811), and the fourth bevel gear (812) is meshingly connected to the first bevel gear (806). An adjusting screw (805) is connected to the bottom of the bevel gear (811), one end of the adjusting screw (805) extends to the outside of the connection box (504), the outer surface of the adjusting screw (805) is threadedly connected to a second screw seat (803), the bottom of the second screw seat (803) is connected to an extrusion wheel (804) for fitting against the top of the guardrail and limiting the guardrail, a rotating rod (801) is slidably connected inside the sleeve (810), the cross-sectional shapes of the rotating rod (801) and the inner wall of the sleeve (810) are both regular hexagons, and the rotating rod (801) is rotatably connected between the two fixed plates; The flip assembly (4) comprises a fixed ring (401), one side of the fixed ring (401) is rotatably connected to a rotating gear ring (405), the interior of the rotating gear ring (405) is provided with two mounting rods (407) in a mirror-symmetrical manner, one side of the mounting rod (407) is connected to two electric push rods (406), the other end of the electric push rod (406) is connected to the inner side of the rotating gear ring (405), both sides of the mounting rod (407) are connected to limit sliding rods (408), the other end of the limit sliding rod (408) is slidably connected to a clamping block (410), the end of the clamping block (410) away from the limit sliding rod (408) is connected to a fitting wheel (411), the fitting One side of the wheel (411) is in contact with the inner wall of the rotating gear ring (405); a reset spring (409) is sleeved on the outer surface of the limiting slide rod (408); two ends of the reset spring (409) are respectively connected to one side of the mounting rod (407) and one side of the clamping block (410); both sides of the fixing ring (401) are connected to mounting blocks (402); one side of the mounting blocks (402) is connected to one side of the support plate (3); one side of the top of one of the mounting blocks (402) is connected to a flip motor (403) through the mounting plate; one end of the output end of the flip motor (403) is connected to a transmission gear (404); one side of the transmission gear (404) is meshed with the rotating gear ring (405).

2. A welding device for bridge guardrail according to claim 1, characterized in that: Both sides of the bottom of the rotating tube (509) are connected to limit sliding blocks (510), and both sides of the moving rod (512) are provided with limit sliding grooves (511), and the limit sliding blocks (510) are slidably connected in the limit sliding grooves (511).

3. A welding device for bridge guardrail according to claim 1, characterized in that: The outer surface of the connecting shaft (807) is rotatably connected to a mounting piece, and the mounting piece is connected to the bottom of the inner wall of the connecting box (504). Both sides of the bottom of the connecting box (504) are connected to fixed slide bars (802), and the two fixed slide bars (802) are symmetrically distributed on both sides of the adjustment screw (805). Both sides of the top of the second screw seat (803) are provided with sliding holes, and the fixed slide bars (802) are slidably connected in the sliding holes. One side of the second screw seat (803) is connected to a mounting seat, and the mounting seat is rotatably connected to the moving rod (512).

4. A welding device for bridge guardrail according to claim 1, characterized in that: The bottoms of the two support plates (3) are connected to the same base plate (1), and movable modules (2) are arranged on both sides of the top of the base plate (1). An adjustment module (6) is connected between the tops of the two movable modules (2), and a welding gun body (7) is arranged on one side of the adjustment module (6).

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