A fully automatic ladder-type bridge frame welding production line

Abstract

The present invention discloses a fully automatic ladder - type bridge frame welding production line, which sequentially includes a feeding mechanism, a front - side welding mechanism, a material receiving mechanism, and a back - side welding mechanism arranged from left to right. An unloading mechanism is arranged below the back - side welding mechanism; the front - side welding mechanism includes two opposite support platforms I, brackets, a ladder - edge conveying unit, an upper - and - lower clamping unit, and a welding mechanism I. An opening - and - closing driving unit for driving the two brackets to slide relative to each other is arranged on the support platform I; the back - side welding mechanism includes two opposite support platforms II, a flipping unit arranged between the two support platforms, and a welding mechanism II arranged above the support platform II. The welding mechanism II is slidably connected to the top end of the support platform II. By adopting the fully automatic ladder - type bridge frame welding production line with the above structure, the present invention can accurately fix the welding positions of the ladder edges, and respectively weld the connection positions between the ladder edges and the ladder beams through the front - side welding mechanism and the back - side welding mechanism, making the welding more firm and increasing the welding efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of welding equipment, and particularly to a fully automatic ladder-type bridge frame welding production line. Background Art

[0002] At present, cable bridge frames are divided into structures such as trough-type cable bridge frames, tray-type cable bridge frames, ladder-type cable bridge frames, and grid bridge frames. Among them, the ladder-type bridge frame includes two opposite ladder edges and a plurality of ladder supports welded between the two ladder edges. However, at present, both the ladder edges and the ladder supports need to be manually positioned and welded during the welding of the ladder-type bridge frame, resulting in inaccurate welding positions, defective products, low welding efficiency, and large labor intensity. Moreover, the current welding equipment cannot weld ladder supports with different widths between the two ladder edges, and the applicability of the equipment is not wide. Summary of the Invention

[0003] The object of the present invention is to provide a fully automatic ladder-type bridge frame welding production line to solve the problems of inaccurate welding positions, low welding efficiency, and the inability of the welding equipment to be applicable to the welding of ladder supports with different widths during the welding process of the ladder-type bridge frame.

[0004] To achieve the above object, the present invention provides a fully automatic ladder-type bridge frame welding production line, which sequentially includes a feeding mechanism for receiving ladder edges, a front welding mechanism, a material receiving mechanism, and a back welding mechanism arranged from left to right. An unloading mechanism is arranged below the back welding mechanism;

[0005] The front welding mechanism includes two opposite support platforms I, a bracket arranged on the support platform I, a ladder edge conveying unit for conveying the ladder edges, an upper and lower clamping unit for clamping the top and bottom ends of the ladder edges, and a welding mechanism I arranged above the support platform I. An opening and closing driving unit for driving the two brackets to slide relatively is arranged on the support platform I, and the ladder edge conveying unit and the upper and lower clamping unit are both installed on the bracket;

[0006] The back welding mechanism includes two opposite support platforms II, a flipping unit arranged between the two support platforms, and a welding mechanism II arranged above the support platform II. The welding mechanism II is slidably connected to the top end of the support platform II.

[0007] Preferably, the ladder-side conveying unit includes a plurality of conveying rollers and a plurality of inner pinch rollers respectively arranged on both sides of the ladder side. The conveying rollers are arranged in the bracket. A conveying shaft penetrates through the middle of the conveying rollers. A follower wheel is arranged at the top end of the conveying shaft, and a driven wheel is arranged at the bottom end of the conveying shaft. The plurality of follower wheels are sequentially connected by a synchronous belt. A tensioning roller is arranged on one side of the synchronous belt, and the tensioning roller is slidably connected to the top end of the bracket. The plurality of driven wheels are sequentially connected by a driven belt. The driven wheel is connected to the driving wheel by a driving belt, and the driving wheel is connected to the conveying motor;

[0008] The top end of the inner pinch roller is rotatably connected to the bottom end of the inner pinch shaft. The top ends of the plurality of inner pinch shafts are connected to the inner pinch cross beam. One side of the inner pinch cross beam away from the inner pinch shaft is connected to one end of a plurality of adjusting slide bars. A fixed block is sleeved in the middle of the adjusting slide bar. The fixed block is fixedly connected to the top end of the bracket. A left-right adjusting spring is sleeved on the other end of the adjusting slide bar. One end of the left-right adjusting spring is connected to the fixed block, and the other end of the left-right adjusting spring abuts against a nut one screwed on the other end of the adjusting slide bar.

[0009] Preferably, a left-right clamping unit is arranged on one side of the conveying roller away from the inner pinch roller. The left-right clamping unit includes a clamping cylinder, a clamping rack, a clamping gear, a clamping screw rod and a clamping roller. The clamping cylinder is connected to the clamping rack. The clamping rack is meshed with the clamping gear. The middle of the clamping gear is connected to the clamping screw rod. The clamping screw rod is connected to a fixed bracket. The clamping roller is rotatably connected to the fixed bracket, and the clamping roller abuts against the ladder side.

[0010] Preferably, the up-down clamping unit includes an adjusting plate, an adjusting rod, an up-down adjusting spring, a plurality of drag rollers and a plurality of upper pressure wheels respectively arranged at the bottom end and the top end of the ladder side. The drag rollers are connected to the bottom end of the bracket through drag shafts. The plurality of upper pressure wheels are connected to the adjusting plate through upper pressure shafts. The adjusting plate is arranged in the bracket. Both ends of the adjusting plate penetrate into both ends of the bracket. The bracket is provided with indicating scales corresponding to both ends of the adjusting plate. The top end of the adjusting rod passes through the adjusting plate and is fixed by a nut two. A support block is sleeved in the middle of the adjusting plate and fixedly connected thereto. The up-down adjusting spring is arranged between the adjusting plate and the support block, and the up-down adjusting spring is sleeved on the adjusting rod.

[0011] Preferably, the opening and closing drive unit includes an opening and closing motor 1, an opening and closing lead screw 1, and a slider 1 disposed at the bottom end of the bracket. A linear guide rail 1 is provided between the two support platforms 1. The bracket is slidably connected to the support platform 1 through the linear guide rail 1. The opening and closing motor 1 is connected to one end of the opening and closing lead screw 1. The other end of the opening and closing lead screw 1 sequentially passes through the two sliders 1 and is rotatably connected thereto.

[0012] Preferably, the flipping unit includes two opposite cross beams and two groups of opposite vertical beam groups. One vertical beam group and the top end of the cross beam and the other vertical beam group and the bottom end of the cross beam respectively enclose two mirror-symmetrical flipping platforms. The vertical beam group includes two opposite vertical beams. Linear guide rails 2 are provided at both the top and bottom ends of the cross beam. Both ends of the vertical beam are slidably connected to the two cross beams through the linear guide rails 2. A flipping drive assembly for driving the flipping platform to flip 180 degrees is provided on the cross beam. A spacing adjustment assembly for driving the two vertical beams to slide on the cross beam is provided on the cross beam. A clamping assembly for conveying and fixing the ladder edge is provided on the cross beam.

[0013] Preferably, the flipping drive assembly includes a flipping cylinder, a flipping rack, and a flipping gear. The flipping cylinder is connected to the flipping rack. The flipping rack is meshed with the flipping gear. A rotating shaft is penetrated through the middle of the flipping gear. One end of the rotating shaft is connected to a bearing seat. The other end of the rotating shaft is connected to the cross beam.

[0014] Preferably, the spacing adjustment assembly includes an opening and closing motor 2, an opening and closing lead screw 2, and a slider 2 disposed at the bottom end of the vertical beam. The opening and closing motor 2 is connected to one end of the opening and closing lead screw. The other end of the opening and closing lead screw sequentially passes through the two sliders 2 and is rotatably connected thereto.

[0015] Preferably, the clamping assembly includes a plurality of receiving rollers disposed at the bottom end of the ladder edge and a plurality of clamping members for clamping and fixing the ladder edge. The receiving rollers are connected to the vertical beam through receiving shafts. The clamping member includes a pneumatic lifting slide table and a fixed rotating cylinder disposed on the pneumatic lifting slide table. A clamping jaw is provided on the fixed rotating cylinder. The bottom end of the ladder edge is disposed between the receiving rollers and the clamping jaw.

[0016] Preferably, the receiving mechanism includes a magnet and a receiving drive unit for driving the magnet to extend out of the vertical beam.

[0017] Therefore, the fully automatic ladder-type bridge welding production line adopting the above structure in the present invention has the following beneficial effects:

[0018] 1. The ladder side conveying unit clamps both sides of the ladder side using conveying rollers and inner pinch rollers, and transports the ladder side to the lower part of the first welding mechanism by the rolling of the conveying rollers to weld the connection position between the ladder side and the ladder crossbar. When there is an error in the length of the ladder crossbar (the length of the ladder crossbar is slightly smaller than the distance between the two ladder sides), the left and right clamping units can be used to push the ladder side towards the inner pinch rollers to make the ladder side fit the ladder crossbar, facilitating welding;

[0019] 2. The opening and closing drive unit can adjust the distance between the two brackets, so that the ladder crossbars between the two ladder sides can adopt different lengths, with a wider range of use;

[0020] 3. The upper and lower clamping units can clamp the top and bottom ends of the ladder side, and the upper pressure wheel can finely adjust the distance between the upper pressure wheel and the drag roller through the up and down adjusting spring, being applicable to ladder sides of different heights;

[0021] 4. The present invention can achieve automatic welding of the connection position between the ladder side and the ladder crossbar, requiring less manual labor and having a higher welding efficiency.

[0022] The technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of an embodiment of a fully automatic ladder - type bridge welding production line of the present invention;

[0024] Figure 2 is a schematic structural diagram of the front - side welding mechanism of an embodiment of a fully automatic ladder - type bridge welding production line of the present invention;

[0025] Figure 3 is a front view of the front - side welding mechanism of an embodiment of a fully automatic ladder - type bridge welding production line of the present invention;

[0026] Figure 4 is a rear view of the front - side welding mechanism of an embodiment of a fully automatic ladder - type bridge welding production line of the present invention;

[0027] Figure 5 is a schematic structural diagram of the bracket of an embodiment of a fully automatic ladder - type bridge welding production line of the present invention;

[0028] Figure 6 is a schematic structural diagram of the ladder - side conveying unit and the upper and lower clamping units of an embodiment of a fully automatic ladder - type bridge welding production line of the present invention;

[0029] Figure 7 is a schematic structural diagram of the flipping unit of an embodiment of a fully automatic ladder - type bridge welding production line of the present invention;

[0030] Figure 8It is a side view of the flipping unit of an embodiment of a fully automatic ladder - type bridge frame welding production line of the present invention;

[0031] Figure 9 It is a schematic structural diagram of the material clamping assembly of an embodiment of a fully automatic ladder - type bridge frame welding production line of the present invention;

[0032] Figure 10 is Figure 7 the enlarged view of

[0033] In the figure: 1. Feeding mechanism; 11. Feeding rack; 12. Feeding roller;

[0034] 2. Front - side welding mechanism; 21. First support platform; 22. Bracket; 23. Ladder - side conveying unit; 2301. Conveying roller; 2302. Inner clamping conveying roller; 2303. Conveying shaft; 2304. Follow - up wheel; 2305. Driven wheel; 2306. Synchronous belt; 2307. Tensioning roller; 2308. Driven belt; 2309. Driving wheel; 2310. Conveying motor; 2311. Inner clamping conveying shaft; 2312. Inner clamping conveying cross - beam; 2313. Adjusting slide bar; 2314. Left - right adjusting spring; 2315. First nut; 24. Up - down clamping unit; 2401. Adjusting plate; 2402. Adjusting rod; 2403. Up - down adjusting spring; 2404. Drag roller; 2405. Upper pressure wheel; 2406. Drag shaft; 2407. Upper pressure shaft; 2408. Indication scale; 2409. Support block; 25. First welding mechanism; 26. Opening - closing driving unit; 2601. First opening - closing motor; 2602. First opening - closing lead screw; 2603. First slider; 2604. First linear guide; 27. Left - right clamping unit; 2701. Clamping cylinder; 2702. Clamping rack; 2703. Clamping gear; 2704. Clamping screw; 2705. Clamping roller; 2706. Fixed bracket;

[0035] 3. Material receiving mechanism; 31. Magnet; 32. Material receiving driving unit;

[0036] 4. Back - side welding mechanism; 41. Second support platform; 42. Flipping unit; 4201. Cross - beam; 4202. Vertical beam; 4203. Second linear guide; 43. Second welding mechanism; 44. Flipping driving assembly; 4401. Flipping cylinder; 4402. Flipping rack; 4403. Flipping gear; 4404. Flipping shaft; 4405. Bearing seat; 45. Spacing adjusting assembly; 4501. Second opening - closing motor; 4502. Second opening - closing lead screw; 4503. Second slider; 46. Material clamping assembly; 4601. Material receiving roller; 4602. Material receiving shaft; 4603. Pneumatic lifting slide table; 4604. Rotary cylinder; 4605. Claw;

[0037] 5. Discharging mechanism; 51. Discharging rack; 52. Discharging tray; 53. Discharging motor; 54. Driving sprocket; 55. Transmission chain; 56. Conveyor chain; 57. Roller

[0038] 6. Ladder side; 7. Lifting cylinder; 8. Cleaner Specific embodiments

[0039] The technical solutions of the present invention will be further described below with reference to the drawings and embodiments

[0040] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the field to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "comprising" or "including" mean that the elements or objects appearing before the term cover the elements or objects listed after the term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly

[0041] The embodiments of the present invention will be further described below with reference to the drawings. As Figures 1-10 shown, a full-automatic ladder-type bridge welding production line includes a feeding mechanism 1 for receiving the ladder side 6, a front welding mechanism 2, a material receiving mechanism 3 and a back welding mechanism 4 arranged in sequence from left to right. A discharging mechanism 5 is arranged below the back welding mechanism 4; the front welding mechanism 2 includes two opposite support platforms 21, a bracket 22 arranged on the support platform 21, a ladder side conveying unit 23 for conveying the ladder side 6, an upper and lower clamping unit 24 for clamping the top and bottom ends of the ladder side 6, and a welding mechanism 25 arranged above the support platform 21. An opening and closing driving unit 26 for driving the two brackets 22 to slide relative to each other is arranged on the support platform 21. The ladder side conveying unit 23 and the upper and lower clamping unit 24 are both installed on the bracket 22; the back welding mechanism 4 includes two opposite support platforms 41, a flipping unit 42 arranged between the two support platforms, and a welding mechanism 43 arranged above the support platform 41. The welding mechanism 43 is slidably connected to the top end of the support platform 41. The feeding mechanism 1 includes a feeding rack 11 and a plurality of feeding rollers 12 arranged on the feeding rack 11. The feeding rollers 12 are rotatably connected to the feeding rack 11, and the ladder side 6 is placed on the plurality of feeding rollers 12

[0042] The ladder edge conveying unit 23 includes a plurality of conveying rollers 2301 and a plurality of inner pinch rollers 2302 respectively arranged on both sides of the ladder edge 6. The conveying rollers 2301 are arranged in the bracket 22. A conveying shaft 2303 is penetrated through the middle of the conveying roller 2301. A follower wheel 2304 is arranged at the top end of the conveying shaft 2303, and a driven wheel 2305 is arranged at the bottom end of the conveying shaft 2303. A plurality of follower wheels 2304 are sequentially connected by a synchronous belt 2306. A tensioning roller 2307 is arranged on one side of the synchronous belt 2306. The tensioning roller 2307 is slidably connected to the top end of the bracket 22. A plurality of driven wheels 2305 are sequentially connected by a driven belt 2308. The driven wheel 2305 is connected to the driving wheel 2309 by a driving belt, and the driving wheel 2309 is connected to the conveying motor 2310, so as to convey the ladder edge 6 placed on the feeding mechanism 1 between the inner pinch rollers 2302 and the conveying rollers 2301. The inner pinch rollers 2302 and the conveying rollers 2301 clamp both sides of the ladder edge 6. The conveying motor 2310 drives a plurality of conveying rollers 2301 to rotate, so as to move the ladder edge 6 towards the direction of the welding mechanism 1 25. An operator places the ladder carrier between two ladder edges 6 and aligns it with the welding position. The welding mechanism 1 25 includes a first welding machine and a second welding machine. The first welding machine and the second welding machine respectively weld the two welding positions. The synchronous belt 2306 ensures the stability and synchronism of the rotation of the conveying rollers 2301, and the tensioning roller 2307 can move towards the synchronous belt 2306 and abut against the synchronous belt 2306 to ensure that the synchronous belt 2306 is in a tensioned state, so as to make a plurality of follower wheels 2304 rotate synchronously. The tensioning roller 2307 moves along the direction away from or close to the synchronous belt 2306 at the top end of the bracket 22 to tension the synchronous belt 2306. When the tensioning roller 2307 moves to a suitable position, it can be fixedly clamped.

[0043] The top end of the inner pinch roller 2302 is rotatably connected to the bottom end of the inner pinch shaft 2311. The top ends of a plurality of inner pinch shafts 2311 are connected to the inner pinch cross beam 2312. One side of the inner pinch cross beam 2312 away from the inner pinch shaft 2311 is connected to one end of a plurality of adjusting slide bars 2313. A fixing block is sleeved in the middle of the adjusting slide bar 2313. The fixing block is fixedly connected to the top end of the bracket 22. The other end of the adjusting slide bar 2313 is sleeved with a left - right adjusting spring 2314. One end of the left - right adjusting spring 2314 is connected to the fixing block, and the other end of the left - right adjusting spring 2314 abuts against a nut 1 2315 screwed on the other end of the adjusting slide bar 2313. Due to the different thicknesses of the ladder edge 6, when the thickness of the ladder edge 6 is relatively thick, the ladder edge 6 enters between the conveying roller 2301 and the inner pinch roller 2302. The inner pinch roller 2302 drives the inner pinch cross beam 2312 to move inwards. The adjusting slide bar 2313 slides in the fixing block in the direction away from the nut 1 2315, and the left - right adjusting spring 2314 is compressed. Therefore, the left - right adjusting spring 2314 can finely adjust the distance between the inner pinch roller 2302 and the conveying shaft 2303, so as to adapt to ladder edges 6 of different thicknesses.

[0044] A lifting cylinder 7 is arranged between two brackets 22, and a washer 8 is arranged at the top end of the lifting cylinder 7. The washer 8 is aligned with the first welding machine and the second welding machine. The washer 8 is mainly used to clean the welding torches of the first welding machine and the second welding machine when the entire production line stops. It should be noted that the first welding mechanism 25 and the second welding mechanism 43 are both commonly used welding machines in the art and will not be elaborated here.

[0045] A left - right clamping unit 27 is arranged on the side of the conveying roller 2301 away from the inner pinch roller 2302. The left - right clamping unit 27 includes a clamping cylinder 2701, a clamping rack 2702, a clamping gear 2703, a clamping screw 2704 and a clamping roller 2705. The clamping cylinder 2701 is connected to the clamping rack 2702. The clamping rack 2702 meshes with the clamping gear 2703. The middle of the clamping gear 2703 is connected to the clamping screw 2704. The clamping screw 2704 is connected to a fixed bracket 2706. The clamping roller 2705 is rotatably connected to the fixed bracket 2706. The clamping roller 2705 abuts against the ladder side 6. When the length of the ladder carrier is slightly less than the distance between the two ladder sides, the two ends of the ladder carrier cannot fit with the two ladder sides. At this time, the clamping cylinder 2701 extends to drive the clamping rack 2702 to move, thereby driving the clamping gear 2703 to rotate. The clamping screw 2704 extends to make the clamping roller 2705 contact the ladder side 6. The clamping roller 2705 pushes the ladder side towards the ladder carrier until the ladder side fits with the ladder carrier, which is convenient for welding.

[0046] The upper and lower clamping unit 24 includes an adjusting plate 2401, an adjusting rod 2402, an upper and lower adjusting spring 2403, a plurality of material dragging rollers 2404 and a plurality of upper pressing wheels 2405 respectively arranged at the bottom end and the top end of the ladder side 6. The material dragging rollers 2404 are connected to the bottom end of the bracket 22 through a material dragging shaft 2406, and the plurality of upper pressing wheels 2405 are connected to the adjusting plate 2401 through an upper pressing shaft 2407. The adjusting plate 2401 is arranged in the bracket 22. The two ends of the adjusting plate 2401 penetrate into the two ends of the bracket 22. The bracket 22 is provided with indicating scales 2408 corresponding to the two ends of the adjusting plate 2401. The top end of the adjusting rod 2402 passes through the adjusting plate 2401 and is fixed by a second nut. A support block 2409 is sleeved on the middle part of the adjusting plate 2401 and is fixedly connected thereto. An upper and lower adjusting spring 2403 is arranged between the adjusting plate 2401 and the support block 2409. The upper and lower adjusting spring 2403 is sleeved on the adjusting rod 2402. When the ladder side 6 enters between the inner conveying rollers 2302 and the conveying rollers 2301, at the same time, the upper pressing wheels 2405 and the material dragging rollers 2404 clamp the top end and the bottom end of the ladder side 6. When the height of the ladder side 6 is relatively high, the upper pressing wheels 2405 move upward, the adjusting plate 2401 moves upward along the adjusting rod 2402, and the moving distance can be seen from the scales on the bracket 22. The upper and lower adjusting spring 2403 elongates. Therefore, the upper and lower adjusting spring 2403 can finely adjust the distance between the upper pressing wheels 2405 and the material dragging rollers 2404 to adapt to ladder sides 6 of different heights.

[0047] The opening and closing driving unit 26 includes an opening and closing motor one 2601, an opening and closing lead screw one 2602 and a slider one 2603 arranged at the bottom end of the bracket 22. A linear guide rail one 2604 is arranged between the two support platforms one 21. The bracket 22 is slidably connected to the support platform one 21 through the linear guide rail one 2604. The opening and closing motor one 2601 is connected to one end of the opening and closing lead screw one 2602. The other end of the opening and closing lead screw one 2602 sequentially passes through the two sliders one 2603 and is rotatably connected thereto. Since the lengths of the ladder carriers welded between the two ladder sides 6 are different, the opening and closing motor one 2601 is rotated to drive the opening and closing lead screw one 2602 to rotate. Then, the two brackets 22 move towards each other or away from each other, thereby driving the ladder side conveying unit 23 and the upper and lower clamping unit 24 on the bracket 22 to move towards or away from each other. The distance between the two ladder sides 6 becomes smaller or larger to adapt to ladder carriers of different lengths.

[0048] The flipping unit 42 includes two opposite crossbeams 4201 and two groups of opposite vertical beams 4202. One group of vertical beams 4202 and the top end of the crossbeam 4201, and the other group of vertical beams 4202 and the bottom end of the crossbeam 4201 respectively enclose two mirror-symmetrical flipping platforms. Each group of vertical beams 4202 includes two opposite vertical beams 4202. Linear guide rails two 4203 are provided at both the top end and the bottom end of the crossbeam 4201. The two ends of the vertical beam 4202 are respectively slidably connected to the two crossbeams 4201 through the linear guide rails two 4203. A flipping drive assembly 44 for driving the flipping platform to flip 180 degrees is provided on the crossbeam 4201. A spacing adjustment assembly 45 for driving the two vertical beams 4202 to slide on the crossbeam 4201 is provided on the crossbeam 4201. A clamping assembly 46 for conveying and fixing the ladder edge 6 is provided on the crossbeam 4201. After the front welding mechanism 2 finishes welding, it enters the flipping platform. The clamping assembly 46 clamps and fixes the bottom end of the ladder edge 6. The flipping drive assembly 44 rotates the flipping platform 180 degrees. The welding mechanism two 43 includes two welding machines, namely welding machine three and welding machine four. Welding machine three and welding machine four respectively weld the connection positions of the ladder edge 6 and the ladder support. The flipping drive assembly 44 includes a flipping cylinder 4401, a flipping rack 4402, and a flipping gear 4403. The flipping cylinder 4401 is connected to the flipping rack 4402. The flipping rack 4402 meshes with the flipping gear 4403. A rotating shaft 4404 passes through the middle of the flipping gear 4403. One end of the rotating shaft 4404 is connected to a bearing seat 4405. The other end of the rotating shaft 4404 is connected to the crossbeam 4201. The flipping cylinder 4401 drives the flipping rack 4402 to move, thereby driving the flipping gear 4403 to rotate. The rotating shaft 4404 drives the crossbeam 4201 to rotate, and thus the flipping platform rotates.

[0049] The spacing adjustment assembly 45 includes an opening and closing motor two 4501, an opening and closing lead screw two 4502, and a slider two 4503 disposed at the bottom end of the vertical beam 4202. The opening and closing motor two 4501 is connected to one end of the opening and closing lead screw. The other end of the opening and closing lead screw sequentially passes through the two sliders two 4503 and is rotatably connected thereto. Since the lengths of the ladder carriers are different, it is necessary to adjust the distance between the two vertical beams 4202. At this time, the opening and closing motor two 4501 drives the opening and closing lead screw two 4502 to rotate, and the two sliders two 4503 drive the two vertical beams 4202 to move towards or away from each other on the cross beam 4201, so that the distance between the two vertical beams 4202 adapts to the length of the ladder carrier. The material clamping assembly 46 includes a plurality of receiving rollers 4601 disposed at the bottom end of the ladder side 6 and a plurality of material clamping members for clamping and fixing the ladder side 6. The receiving rollers 4601 are connected to the vertical beam 4202 via a receiving shaft 4602. The material clamping member includes a pneumatic lifting slide 4603 and a fixed rotary cylinder 4604 disposed on the pneumatic lifting slide 4603. A clamping jaw 4605 is disposed on the fixed rotary cylinder 4604. The bottom end of the ladder side 6 is disposed between the receiving roller 4601 and the clamping jaw 4605. When the front welding of the connection between the ladder side 6 and the ladder carrier is completed and transported to the turning table, the pneumatic lifting slide 4603 drives the rotary cylinder 4604 to rise. After the clamping jaw 4605 is aligned with the ladder side 6, the rotary cylinder 4604 drives the clamping jaw 4605 to rotate, and the clamping jaw 4605 and the receiving roller 4601 clamp and fix the ladder side 6. Then, the turning pneumatic assembly turns the turning table, and thus the ladder side 6 and the ladder carrier are turned 180 degrees. The welding mechanism two 43 welds the back of the connection between the ladder carrier and the ladder side 6. After the welding is completed, the rotary cylinder 4604 rotates the clamping jaw 4605 to release the ladder side 6, and the ladder-type bridge falls onto the discharging mechanism 5.

[0050] The receiving mechanism 3 includes a magnet 31 and a receiving driving unit 32 that drives the magnet 31 to extend out of the vertical beam 4202. The receiving driving unit 32 is a commonly used telescopic mechanism in the art. One type of receiving driving unit 32 is a telescopic cylinder, and the telescopic cylinder is disposed in the vertical beam 4202; another type of receiving driving unit 32 includes a telescopic rack, a telescopic gear, and a telescopic motor. The telescopic motor and the telescopic gear are disposed in the vertical beam 4202. The telescopic motor drives the telescopic gear to rotate, and the telescopic gear meshes with the telescopic rack. The telescopic rack extends out of the vertical beam 4202 to align the magnet 31 with the ladder side 6 transported from the front welding mechanism 2, and then the telescopic motor drives the telescopic rack to retract into the vertical beam 4202, and at the same time pulls the ladder side 6 towards the turning table.

[0051] The discharging mechanism 5 includes a discharging frame 51, a discharging tray 52, and a discharging motor 53. One side of the discharging frame 51 is arranged below the turning table, and the other side of the discharging frame 51 extends beyond the turning table. The discharging tray 52 reciprocally slides on the discharging frame 51 through a plurality of rollers 57, aligning with the lower part of the turning table or moving out from below the turning table. The discharging motor 53 is connected to the driving sprocket 54, the driving sprocket 54 is connected to a driven sprocket through a transmission chain 55, one driven sprocket is connected to another driven sprocket through the transmission chain 55, the transmission chain 55 is connected to the bottom end of the discharging tray 52. The rotation of the transmission chain 55 drives the discharging tray 52 to reciprocally move on the discharging frame 51, and transports the welded ladder-type bridge out from below the turning table.

[0052] The specific implementation process of the present invention is as follows:

[0053] (1) The front welding process of the ladder-type bridge is as follows: First, place the two ladder sides 6 on the feeding rollers 12 of the feeding mechanism 1 respectively, and then send the ladder sides 6 into the space between the inner pinch rollers 2302 and the conveying rollers 2301. Under the adjustment of the left and right adjusting springs 2314 and the left and right clamping units 27, the inner pinch rollers 2302 and the conveying rollers 2301 clamp both sides of the ladder sides 6. At the same time, the upper pressing wheel 2405 and the drag roller 2404 clamp the top and bottom ends of the ladder sides 6 through the up and down adjusting springs 2403. Then, drive the two brackets 22 to move towards each other or away from each other through the opening and closing motor one 2601 until the distance between the two ladder sides 6 is the same as the distance between the middle ladder bearers, forming two welding positions by overlapping. At this time, the conveying motor 2310 drives the conveying rollers 2301 to rotate, and the two ladder sides 6 move towards the welding mechanism one 25 simultaneously. Manually place the ladder bearer between the two ladder sides 6 and align the two ends of the ladder bearer with the ladder sides 6. The welding machine one and the welding machine two weld the two welding positions respectively until the entire front welding is completed.

[0054] (2) The back welding process of the ladder-type bridge is as follows: After the welding mechanism one 25 finishes welding, the material receiving driving unit 32 drives the magnet 31 to extend out of the vertical beam 4202 until the magnet 31 adsorbs the ladder side 6. At this time, the material receiving driving unit 32 retracts the vertical beam 4202, and at the same time, the magnet 31 moves the ladder-type bridge with the front side welded to the turning table. The material receiving roller 4601 supports the ladder-type bridge, and the pneumatic lifting slide 4603 rises to drive the rotary cylinder 4604 to rise until the clamping jaws 4605 align with the ladder side 6. The rotary cylinder 4604 rotates, and then the clamping jaws 4605 rotate. The clamping jaws 4605 and the material receiving roller 4601 clamp the bottom end of the ladder side 6 and fix it. Then, the turning cylinder 4401 extends to drive the turning gear 4403 to rotate, and the turning shaft 4404 drives the turning table to rotate 180 degrees. The welding mechanism two 43 moves along the extending direction of the ladder-type bridge and welds the back sides of the two welding positions in sequence until the back welding is completed.

[0055] (3) Discharging process of the ladder-type bridge: The rotating cylinder 4604 drives the clamping jaw 4605 to rotate. Under the action of gravity, the ladder-type bridge descends to the discharging tray 52. The discharging motor 53 rotates the driving sprocket 54 to drive the conveying chain 56 to rotate. Then, the discharging tray 52 moves on the discharging frame 51 until it moves out from under the turning table. Then, the ladder-type bridge with the front and back sides welded is removed from the discharging tray 52 for the next process. At this time, the discharging tray 52 returns under the turning table, and the next ladder-type bridge with the front side welded is re-placed on another turning table to complete the back-side welding process and enter the next cycle.

[0056] Therefore, the full-automatic ladder-type bridge welding production line adopting the above structure in the present invention uses the ladder edge conveying unit and the upper and lower clamping units to clamp and convey the ladder edges, realizes the automatic welding of the ladder-type bridge, uses less labor, and has high welding efficiency.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An automatic ladder-type bridge frame welding production line, characterized in that: It includes a feeding mechanism for receiving the ladder edge, a front welding mechanism, a material receiving mechanism, and a back welding mechanism arranged in sequence from left to right, and a discharging mechanism is arranged below the back welding mechanism; The front welding mechanism includes two opposite support platforms I, a bracket arranged on the support platform I, a ladder edge conveying unit for conveying the ladder edge, an upper and lower clamping unit for clamping the top and bottom ends of the ladder edge, and a welding mechanism I arranged above the support platform I. An opening and closing driving unit for driving the two brackets to slide relative to each other is arranged on the support platform I, and the ladder edge conveying unit and the upper and lower clamping units are both installed on the bracket; The upper and lower clamping unit includes an adjusting plate, an adjusting rod, an upper and lower adjusting spring, a plurality of drag rollers and a plurality of upper pressing wheels respectively arranged at the bottom end and the top end of the ladder edge. The drag rollers are connected to the bottom end of the bracket through drag shafts, and the plurality of upper pressing wheels are connected to the adjusting plate through upper pressing shafts. The adjusting plate is arranged in the bracket, and both ends of the adjusting plate penetrate into both ends of the bracket. The bracket is provided with indicating scales corresponding to both ends of the adjusting plate. The top end of the adjusting rod passes through the adjusting plate and is fixed by a second nut. A support block is sleeved and fixedly connected to the middle of the adjusting plate, and the upper and lower adjusting spring is arranged between the adjusting plate and the support block. The upper and lower adjusting spring is sleeved on the adjusting rod; The back welding mechanism includes two opposite support platforms II, a flipping unit arranged between the two support platforms II, and a welding mechanism II arranged above the support platform II. The welding mechanism II is slidably connected to the top end of the support platform II. The flipping unit includes two opposite cross beams and two groups of opposite vertical beam groups. One vertical beam group and the top end of the cross beam and the other vertical beam group and the bottom end of the cross beam respectively enclose two mirror-symmetrical flipping platforms. The vertical beam group includes two opposite vertical beams. Linear guide rails II are arranged at both the top end and the bottom end of the cross beam. Both ends of the vertical beam are respectively slidably connected to the two cross beams through the linear guide rails II. A flipping driving component for driving the flipping platform to flip 180 degrees is arranged on the cross beam. A spacing adjusting component for driving the two vertical beams to slide on the cross beam is arranged on the cross beam. A material clamping component for fixing the ladder edge is arranged on the cross beam.

2. The fully automatic ladder-type bridge frame welding production line according to claim 1, characterized in that: The ladder edge conveying unit includes a plurality of conveying rollers and a plurality of inner clamping rollers respectively arranged on both sides of the ladder edge. The conveying rollers are arranged in the bracket. A conveying shaft penetrates through the middle of the conveying rollers. A follower wheel is arranged at the top end of the conveying shaft, and a driven wheel is arranged at the bottom end of the conveying shaft. The plurality of follower wheels are sequentially connected through a synchronous belt. A tensioning roller is arranged on one side of the synchronous belt. The tensioning roller is slidably connected to the top end of the bracket. The plurality of driven wheels are sequentially connected through a driven belt. The driven wheel is connected to the driving wheel through a driving belt, and the driving wheel is connected to the conveying motor; The top end of the inner pinch roll is rotatably connected to the bottom end of the inner pinch shaft. The top ends of multiple inner pinch shafts are connected to the inner pinch cross beam. One side of the inner pinch cross beam away from the inner pinch shaft is connected to one end of multiple adjusting slide bars. A fixing block is sleeved in the middle of the adjusting slide bar. The fixing block is fixedly connected to the top end of the bracket. A left-right adjusting spring is sleeved on the other end of the adjusting slide bar. One end of the left-right adjusting spring is connected to the fixing block, and the other end of the left-right adjusting spring abuts against a nut one tightened on the other end of the adjusting slide bar.

3. The fully automatic ladder-type bridge frame welding production line according to claim 2, wherein: A left-right clamping unit is arranged on one side of the conveying roll away from the inner pinch roll. The left-right clamping unit includes a clamping cylinder, a clamping rack, a clamping gear, a clamping screw rod, and a clamping roll. The clamping cylinder is connected to the clamping rack. The clamping rack is meshed with the clamping gear. The middle of the clamping gear is connected to the clamping screw rod. The clamping screw rod is connected to a fixed bracket. The clamping roll is rotatably connected to the fixed bracket. The clamping roll abuts against the ladder edge.

4. The fully automatic ladder-type bridge frame welding production line according to claim 1, characterized in that: The opening and closing driving unit includes a first opening and closing motor, a first opening and closing lead screw, and a first slider arranged at the bottom end of the bracket. A first linear guide rail is arranged between two first support platforms. The bracket is slidably connected to the first support platform through the first linear guide rail. The first opening and closing motor is connected to one end of the first opening and closing lead screw. The other end of the first opening and closing lead screw sequentially passes through the two first sliders and is rotatably connected to them.

5. The full-automatic ladder-type bridge frame welding production line according to claim 1, wherein: The flipping driving assembly includes a flipping cylinder, a flipping rack, and a flipping gear. The flipping cylinder is connected to the flipping rack. The flipping rack is meshed with the flipping gear. A flipping shaft is penetrated through the middle of the flipping gear. One end of the flipping shaft is connected to a bearing seat. The other end of the flipping shaft is connected to the cross beam.

6. The fully automatic ladder-type bridge frame welding production line according to claim 1, characterized in that: The spacing adjusting assembly includes a second opening and closing motor, a second opening and closing lead screw, and a second slider arranged at the bottom end of the vertical beam. The second opening and closing motor is connected to one end of the second opening and closing lead screw. The other end of the second opening and closing lead screw sequentially passes through the two second sliders and is rotatably connected to them.

7. The fully automatic ladder-type bridge frame welding production line according to claim 1, characterized in that: The material clamping assembly includes multiple receiving rolls arranged at the bottom end of the ladder edge and multiple material clamping members for clamping and fixing the ladder edge. The receiving rolls are connected to the vertical beam through receiving shafts. The material clamping member includes a pneumatic lifting slide table and a fixed rotating cylinder arranged on the pneumatic lifting slide table. A clamping jaw is arranged on the fixed rotating cylinder. The bottom end of the ladder edge is arranged between the receiving roll and the clamping jaw.

8. A fully automatic ladder-type bridge welding production line according to claim 1, characterized in that: The receiving mechanism includes a magnet and a receiving driving unit for driving the magnet to extend out of the vertical beam.

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