A welding device applied to a railway open-spandrel continuous rigid-frame bridge

Abstract

The present invention relates to the technical field of welding equipment, and discloses a welding device applied to a railway open-web continuous rigid frame bridge, which includes a mobile welding mechanism. The mobile welding mechanism includes a mobile frame, on which a welding box capable of transverse movement and lifting is provided. A welding torch is provided at the bottom of the welding box. It also includes a discharging rack and a feeding mechanism. The discharging rack includes a plurality of longitudinal brackets, the top surface of the longitudinal brackets is inclined, longitudinal steel bars are placed on the top of the longitudinal brackets, and the feeding mechanism conveys transverse steel bars onto the longitudinal steel bars on the longitudinal brackets. The transverse steel bars move in a free rolling manner, and the welding torch is moved by the mobile frame to the intersection point of the longitudinal steel bars and the transverse steel bars for welding. This device realizes the automatic cloth feeding, discharging and welding of the steel bar mesh. Compared with the traditional manufacturing of steel bar meshes, it greatly improves the quality of the arrangement spacing of steel bars and the manufacturing efficiency. The uniquely designed welding track can improve the covering effect of the welding points and enhance the welding firmness of the steel bars.

Description

Technical Field

[0001] The present invention relates to the technical field of welding equipment, and specifically refers to a welding device applied to railway open-web continuous rigid frame bridges. Background Art

[0002] An open-web continuous rigid frame bridge is a type of bridge structure. It forms an integral structure through in-situ casting of formwork and reinforced concrete, and is mainly used for bridges that need to span large distances or require high wind resistance. Its main feature is that the main beam of the bridge is hollow, which reduces its self-weight while improving the overall stiffness and stability of the structure. To achieve the open-web structure and improve the stability of the structure, the layout density of the steel mesh is increased.

[0003] Constructing an open-web continuous rigid frame bridge requires a large amount of steel mesh. The steel mesh needs to be formed by arranging and welding multiple steel bars. The manufacture of the steel mesh requires manual material arrangement. After the material arrangement is completed, welding is carried out. The manual material arrangement speed is slow, and the controllability of the material arrangement spacing is poor, and the quality of the steel mesh cannot be well controlled. To improve the alignment, it is usually necessary to tie steel wires at the intersections of the steel bars before welding, which increases the labor cost and reduces the manufacturing efficiency. Moreover, manual welding is used for steel bar welding, and the quality of the welding points is inconsistent, and the forming degree of the steel mesh is poor. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the above difficulties and provide a welding device applied to railway open-web continuous rigid frame bridges.

[0005] To solve the above technical problem, the technical solution provided by the present invention is: a welding device applied to railway open-web continuous rigid frame bridges, including a mobile welding mechanism. The mobile welding mechanism includes a mobile frame, on which a welding box that can be horizontally translated and lifted is provided, and a welding gun is provided at the bottom of the welding box;

[0006] It also includes a material arrangement frame and a feeding mechanism. The material arrangement frame includes a plurality of longitudinal brackets, the top surface of the longitudinal brackets is inclined, longitudinal steel bars are placed on the top of the longitudinal brackets, and the feeding mechanism transports transverse steel bars onto the longitudinal steel bars on the longitudinal brackets. The transverse steel bars move by free rolling, and the welding gun is moved by the mobile frame to the intersection of the longitudinal steel bars and the transverse steel bars for welding;

[0007] A welding displacement mechanism is provided in the welding box. The welding displacement mechanism includes a motor three, a swing rod, and a displacement shaft. A turntable is provided at the output end of the motor three, an eccentric column is provided at the bottom of the turntable, a driving groove that slidably cooperates with the eccentric column is provided at one end of the swing rod, the other end of the swing rod drives the displacement shaft to rotate, a connecting rod is obliquely provided at the bottom of the displacement shaft, a clamping ring is provided at the end of the connecting rod, and the welding gun is provided on the clamping ring.

[0008] As an improvement: a top column is provided on the displacement shaft, an inclined ring platform is provided at the bottom of the welding box, the end of the top column is in contact with and cooperated with the bottom of the inclined ring platform, a spline shaft is provided on the top of the displacement shaft, a partition is provided in the middle section of the spline shaft, a spline groove 1 is provided at the end of the rocker arm, the spline groove 1 cooperates with the spline shaft above the partition, a spring connected to the welding box is provided at the bottom of the partition, a positioning ring is rotatably provided at the through hole at the bottom of the welding box, and a spline groove 2 cooperating with the spline shaft below the partition is provided at the axis center of the positioning ring.

[0009] As an improvement: a cross baffle is provided at the rear end of the longitudinal bracket, a feeding rack is provided between adjacent longitudinal brackets, the rear end of the feeding rack is hinged to the cross baffle, a hydraulic cylinder is provided at the bottom of the front end of the feeding rack, and a discharge trough is provided on the longitudinal bracket and the feeding rack, and the longitudinal ribs are placed in the discharge trough.

[0010] As an improvement: the feeding mechanism includes a motor 1, a drive shaft and a conveyor belt, the drive shaft is rotatably arranged at the bottom of the front end of the longitudinal bracket, the output end of the motor 1 is provided with a bevel tooth 1, the end of the drive shaft is provided with a bevel tooth 2 meshing with the bevel tooth 1, the inner side of the conveyor belt is provided with a lower rotating roller and an upper rotating roller, multiple lower rotating rollers are connected to the drive shaft, the upper rotating roller is rotatably arranged at the top of the front end of the longitudinal bracket, and multiple angle plates are evenly arranged on the outside of the conveyor belt, and the conveyor belt pushes the steel bars onto the longitudinal bracket through the angle plates.

[0011] As an improvement: an inclined plate is provided on the top of the front end of the longitudinal bracket, the upper rotating roller is rotatably arranged on the inclined plate, and the discharge trough on the longitudinal bracket extends to the inner side of the inclined plate.

[0012] As an improvement: the mobile frame includes two vertical frames, a horizontal beam and a horizontal sliding table. The two vertical frames are respectively arranged at the two ends of the horizontal beam. Wheels are arranged at the bottom of the vertical frames. The horizontal sliding table is arranged on the horizontal beam for horizontal sliding. A driving structure for driving the horizontal sliding table to move is arranged in the horizontal beam. The welding box is arranged on the horizontal sliding table for sliding up and down. A cylinder is arranged on the horizontal sliding table, and the output end of the cylinder is connected to the top of the welding box.

[0013] As an improvement: the driving structure includes a second motor, a threaded column is provided at the output end of the second motor, and a threaded hole matching the threaded column is provided on the transverse platform.

[0014] As an improvement: an alignment mechanism is provided on the inner side of the stand, the alignment mechanism comprises a cylinder 1, a push plate is provided at the output end of the cylinder 1, and a baffle 1 is provided on the front side of the push plate.

[0015] Compared with the prior art, the invention has the following beneficial effects: the device realizes the automatic laying, discharging and welding of the steel mesh, and greatly improves the quality of the steel bar arrangement spacing and the manufacturing efficiency compared with the traditional steel mesh manufacturing. The uniquely designed welding track can improve the welding point covering effect and improve the steel bar welding firmness. Specifically:

[0016] 1. The semi-circular swing welding is realized through the welding positioner mechanism, and it is further improved to inclined semi-elliptical swing welding through the inclined ring platform, which improves the welding coating effect at the intersection of the transverse ribs and longitudinal ribs and enhances the welding quality.

[0017] 2. Through the unique design of the discharging rack, the automatic discharging function is realized. Based on the longitudinal ribs on the longitudinal support bracket, the transverse ribs are welded on the longitudinal ribs. After the transverse ribs are arranged and welded, the welding of the longitudinal ribs is supplemented, so that the longitudinal and transverse spacing of the steel bars can be effectively controlled.

[0018] 3. The automatic feeding of the transverse ribs is realized through the feeding mechanism. Relying on the inclined design of the inclined plate and the top of the longitudinal support bracket, the transverse ribs can automatically roll to the preset position, and the transverse ribs stop and the ends of the steel bars are aligned through the alignment mechanism. Brief Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of a welding device applied to a railway open-spandrel continuous rigid-frame bridge according to the present invention.

[0020] Figure 2 It is a schematic structural diagram of the discharging rack of a welding device applied to a railway open-spandrel continuous rigid-frame bridge according to the present invention.

[0021] Figure 3 It is a sectional view of the discharging rack of a welding device applied to a railway open-spandrel continuous rigid-frame bridge according to the present invention.

[0022] Figure 4 It is a schematic structural diagram of the feeding supplement rack of a welding device applied to a railway open-spandrel continuous rigid-frame bridge according to the present invention.

[0023] Figure 5 It is a schematic structural diagram of the feeding mechanism of a welding device applied to a railway open-spandrel continuous rigid-frame bridge according to the present invention.

[0024] Figure 6 It is a schematic structural diagram of the moving rack of a welding device applied to a railway open-spandrel continuous rigid-frame bridge according to the present invention.

[0025] Figure 7 It is an exploded view of the moving rack of a welding device applied to a railway open-spandrel continuous rigid-frame bridge according to the present invention.

[0026] Figure 8 It is a schematic structural diagram of the welding box of a welding device applied to a railway open-spandrel continuous rigid-frame bridge according to the present invention.

[0027] Figure 9 It is a schematic structural diagram of the welding positioner mechanism of a welding device applied to a railway open-spandrel continuous rigid-frame bridge according to the present invention.

[0028] Figure 10It is an exploded view of the welding displacement structure of a welding device applied to a railway open-web continuous rigid frame bridge in the present invention.

[0029] As shown in the figure: 1. Discharge rack; 2. Loading mechanism; 3. Mobile welding mechanism; 4. Mobile frame; 5. Welding box; 6. Welding displacement mechanism; 7. Welding torch; 8. Hanging frame; 11. Longitudinal bracket; 12. Transverse baffle; 13. Supplementary material rack; 14. Discharge chute; 15. Cross bar; 16. Connecting beam; 17. Hydraulic cylinder 1; 18. Bottom plate; 19. Inclined plate; 21. Motor 1; 211. Bevel gear 1; 22. Driving shaft; 221. Bevel gear 2; 23. Conveyor belt; 231. Lower turning roller; 232. Upper turning roller; 24. Angle plate; 41. Vertical frame; 411. Wheel; 42. Cross beam; 43. Alignment mechanism; 431. Cylinder 1; 432. Pushing plate; 433. Baffle 1; 44. Driving structure; 441. Motor 2; 442. Threaded column; 45. Transverse moving table; 451. Cylinder; 51. Baffle 2; 61. Motor 3; 62. Turntable; 621. Eccentric column; 63. Swing rod; 631. Driving groove; 632. Spline groove 1; 64. Displacement shaft; 641. Spline shaft; 642. Partition plate; 643. Spring; 644. Connecting rod; 645. Clamping ring; 646. Top column; 65. Inclined ring platform; 66. Positioning ring; 661. Spline groove 2. Detailed implementation manners

[0030] The present invention will be further described in detail below with reference to the accompanying drawings.

[0031] Combined with the attached Figure 1 and the attached Figure 2 As shown, a welding device applied to a railway open-web continuous rigid frame bridge includes a mobile welding mechanism 3. The mobile welding mechanism 3 includes a mobile frame 4. A welding box 5 that can be horizontally moved and lifted is provided on the mobile frame 4. A welding machine is provided inside the welding box 5, and a welding torch 7 is provided at the bottom of the welding box 5. It also includes a discharge rack 1 and a loading mechanism 2. The discharge rack 1 includes a plurality of longitudinal brackets 11. The top surface of the longitudinal brackets 11 is inclined. The longitudinal bars are placed on the top of the longitudinal brackets 11. A hanging frame 8 is placed in front of the loading mechanism 2. An inclined plate is provided inside the hanging frame 8. The loading mechanism 2 conveys the transverse bars in the hanging frame 8 onto the longitudinal bars on the longitudinal brackets 11. The transverse bars move by free rolling. The welding torch 7 is moved to the intersection of the longitudinal bars and the transverse bars through the mobile frame 4 for welding.

[0032] Combined with the attached Figure 8 、the attached Figure 9 and the attached Figure 10As shown in the figure, a welding position-changing mechanism 6 is provided inside the welding box 5. The welding position-changing mechanism 6 includes a motor three 61, a swing rod 63, and a position-changing shaft 64. A turntable 62 is provided at the output end of the motor three 61. An eccentric column 621 is provided at the bottom of the turntable 62. One end of the swing rod 63 is provided with a driving groove 631 that slidably cooperates with the eccentric column 621. The other end of the swing rod 63 drives the position-changing shaft 64 to rotate. An inclined connecting rod 644 is provided at the bottom of the position-changing shaft 64. A clamping ring 645 is provided at the end of the connecting rod 644. A welding torch 7 is provided on the clamping ring 645. A top column 646 is provided on the position-changing shaft 64. An inclined ring platform 65 is provided at the bottom of the welding box 5. The end of the top column 646 is in contact and cooperation with the bottom of the inclined ring platform 65. A spline shaft 641 is provided at the top of the position-changing shaft 64. A partition 642 is provided in the middle section of the spline shaft 641. A first spline groove 632 is provided at the end of the swing rod 63. The first spline groove 632 cooperates with the spline shaft 641 above the partition 642. A spring 643 connecting to the welding box 5 is provided at the bottom of the partition 642. A positioning ring 66 is rotatably provided at the through hole at the bottom of the welding box 5. A second spline groove 661 that cooperates with the spline shaft 641 below the partition 642 is provided at the axis center of the positioning ring 66.

[0033] Working principle of the welding position-changing mechanism 6: The motor three 61 drives the turntable 62 to rotate. The eccentric column 621 rotates around the axis of the turntable 62 at the bottom of the turntable 62. Through the sliding cooperation between the eccentric column 621 and the driving groove 631, the swing rod 63 is driven to swing around the axis of the position-changing shaft 64, driving the position-changing shaft 64 to rotate reciprocally. The welding torch 7 fixed on the clamping ring 645 rotates with the rotation of the position-changing shaft 64, forming a semi-circular trajectory for the welding point, and performing semi-encapsulation welding on the intersection of the longitudinal bars and the transverse bars. In order to improve the encapsulation effect, the position-changing shaft 64 is improved by adding an inclined ring platform 65. An upward thrust is applied to the partition 642 through the spring 643, so that the end of the top column 646 always abuts against the inclined surface at the bottom of the inclined ring platform 65. When the position-changing shaft 64 rotates, the top column 646 moves from the middle position to both sides, and is limited by the inclined surface at the bottom of the inclined ring platform 65, causing the top column 646 to drive the position-changing shaft 64 to move downward. When the top column 646 moves from both sides to the middle position, the top column 646 drives the position-changing shaft 64 to move upward, enabling the position-changing shaft 64 to increase the lifting action during the reciprocating rotation process, stretching the semi-circular trajectory of the welding point into an inclined semi-elliptical trajectory. During this process, the angle of the welding torch 7 changes due to rotation, thereby improving the welding effect and the encapsulation effect of the welding point, and improving the welding point quality.

[0034] Combined with attached Figure 1 、attached Figure 2 、attached Figure 3 and attached Figure 4As shown, a transverse baffle 12 is provided at the rear end of the longitudinal bracket 11. A feeding rack 13 is provided between adjacent longitudinal brackets 11. The rear end of the feeding rack 13 is hinged to the transverse baffle 12. A cross bar 15 is provided at the bottom of the front end of the feeding rack 13. Adjacent cross bars 15 are connected by a connecting beam 16. A bottom plate 18 is provided at the bottom of the front end of the longitudinal bracket 11. A first hydraulic cylinder 17 is hinged on the bottom plate 18. The output end of the first hydraulic cylinder 17 is hinged to the cross bar 15. Discharge grooves 14 are provided on both the longitudinal bracket 11 and the feeding rack 13. The longitudinal steel bars are placed in the discharge grooves 14. An inclined plate 19 is provided at the top of the front end of the longitudinal bracket 11.

[0035] Working principle of the discharge rack 1: In the preparation stage of the welded steel bar mesh, the longitudinal steel bars are placed in the discharge grooves 14 on the longitudinal bracket 11 and the feeding rack 13. The end parts of the longitudinal steel bars are blocked by the transverse baffle 12 to make the end parts aligned. Subsequently, the transverse steel bars in the hanging frame 8 are conveyed to the longitudinal steel bars on the longitudinal bracket 11 through the feeding mechanism 2. Since the top of the longitudinal bracket 11 is inclined, and the inclined plate 19 increases the gravitational potential energy of the transverse steel bars, after the transverse steel bars roll from the inclined plate 19 onto the longitudinal steel bars on the longitudinal bracket 11, they roll towards the transverse baffle 12 and stop and align the end parts of the transverse steel bars under the block of the alignment mechanism 43, and then welding is carried out. After the welding of multiple rows of transverse steel bars is completed, the first hydraulic cylinder 17 pushes the feeding rack 13 upward, so that the longitudinal steel bars on the feeding rack 13 are attached to the lower side of the transverse steel bars, and then welding is carried out. In this way, the consistency of the vertical and horizontal arrangement intervals of the steel bar mesh is ensured.

[0036] Combined with attached Figure 2 、attached Figure 3 and attached Figure 5 As shown, the feeding mechanism 2 includes a first motor 21, a driving shaft 22 and a conveyor belt 23. The driving shaft 22 is rotatably arranged at the bottom of the front end of the longitudinal bracket 11. A first bevel gear 211 is provided at the output end of the first motor 21. A second bevel gear 221 meshing with the first bevel gear 211 is provided at the end of the driving shaft 22. A lower rotating roller 231 and an upper rotating roller 232 are provided inside the conveyor belt 23. Multiple lower rotating rollers 231 are all connected to the driving shaft 22. The upper rotating roller 232 is rotatably arranged on the inclined plate 19. The discharge groove 14 on the longitudinal bracket 11 extends to the inside of the inclined plate 19. A plurality of angle plates 24 are evenly provided on the outer side of the conveyor belt 23. The conveyor belt 23 pushes the steel bars onto the longitudinal bracket 11 through the angle plates 24.

[0037] Working principle of the feeding mechanism 2: The first motor 21 drives the first bevel gear 211 to rotate. Through the meshing transmission of the first bevel gear 211 and the second bevel gear 221, the driving shaft 22 rotates, driving multiple lower rotating rollers 231 to rotate synchronously, so that the conveyor belt 23 rotates. The transverse steel bars are lifted by a plurality of angle plates 24 on the outer side of the conveyor belt 23 and are thrown onto the inclined plate 19 at the top. The width of the angle plate 24 allows one steel bar to be placed. A detection system is arranged on the longitudinal bracket 11. After one transverse steel bar passes, the feeding stops, and the feeding resumes after the welding is completed.

[0038] Combined with attached Figure 1 、attached Figure 6and the attached Figure 7 As shown, the moving frame 4 includes two vertical frames 41, a cross beam 42 and a transverse moving table 45. The two vertical frames 41 are respectively arranged at both ends of the cross beam 42. Wheels 411 are provided at the bottoms of the two vertical frames 41. Power mechanisms for driving the wheels 411 to rotate are provided inside the two vertical frames 41. The transverse moving table 45 is horizontally slidably arranged on the cross beam 42. A slide rail is provided at the rear side of the transverse moving table 45, and a chute slidably matched with the slide rail is provided on the cross beam 42. A driving structure 44 is provided inside the cross beam 42. The driving structure 44 includes a second motor 441. A threaded column 442 is provided at the output end of the second motor 441. A threaded hole matched with the threaded column 442 is provided on the transverse moving table 45. The welding box 5 is vertically slidably arranged on the transverse moving table 45. A cylinder 451 is provided on the transverse moving table 45. The output end of the cylinder 451 is connected to the top of the welding box 5.

[0039] Working principle of the moving frame 4: The power mechanism inside the vertical frame 41 drives the wheels 411 to rotate, so that the moving frame 4 moves longitudinally. The second motor 441 drives the threaded column 442 to rotate. Through the cooperation between the threaded column 442 and the threaded hole on the transverse moving table 45, the transverse moving table 45 moves horizontally on the cross beam 42. The cylinder 451 drives the welding box 5 to perform a lifting action on the transverse moving table 45, so that the welding torch 7 can move to welding points at different positions.

[0040] Combined with the attached Figure 7 and the attached Figure 8 As shown, an alignment mechanism 43 is provided on the inner side surface of the vertical frame 41. The alignment mechanism 43 includes a first cylinder 431. A push plate 432 is provided at the output end of the first cylinder 431. A first baffle 433 is provided on the front side of the push plate 432. A second baffle 51 is provided at the bottom of the welding box 5.

[0041] Working principle of the alignment mechanism 43: During the feeding and rolling stages of the steel bars, since there is no restriction, the ends of the transverse steel bars are not aligned. When the steel bars roll to the preset position, the ends of the transverse steel bars are blocked by the first baffle 433, the middle position of the transverse steel bars is blocked by the second baffle 51, and the push plate 432 is driven to move by the first cylinder 431, so that the push plate 432 aligns the ends of the transverse steel bars.

[0042] In the specific implementation of the present invention, the longitudinal bars are placed into the discharge grooves 14 on the longitudinal support bracket 11 and the feeding rack 13. Subsequently, the hanging frame 8 containing the transverse bars is lifted and placed in front of the feeding mechanism 2. The transverse bars in the hanging frame 8 roll to the conveyor belt 23. Then, the feeding mechanism 2 conveys the transverse bars onto the longitudinal bars on the longitudinal support bracket 11. After the transverse bars roll from the inclined plate 19 onto the longitudinal bars on the longitudinal support bracket 11, they roll towards the transverse baffle 12 and are blocked by the alignment mechanism 43 to stop and align the ends of the transverse bars. Subsequently, welding is performed by the welding torch 7. By moving the moving frame 4, the welding torch 7 is transferred to different welding points. During welding, the welding trajectory is changed by the welding position-changing mechanism 6 to make the welding trajectory present an inclined semi-elliptical shape, improving the coating effect at the welding points and the welding quality. After all the transverse bars are welded to several longitudinal bars, the feeding rack 13 pushes the remaining longitudinal bars upward, and then the remaining longitudinal bars and transverse bars are welded.

[0043] The present invention and its implementation manners have been described above. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the present invention, creatively design structural manners and embodiments similar to the technical solution, they shall fall within the protection scope of the present invention.

Claims

1. A welding device for a railway hollow continuous rigid frame bridge, comprising a mobile welding mechanism (3), the mobile welding mechanism (3) comprising a mobile frame (4), a welding box (5) capable of being moved laterally and raised and lowered is arranged on the mobile frame (4), a welding gun (7) is arranged at the bottom of the welding box (5), and the device is characterized in that: It also includes a material discharging rack (1) and a feeding mechanism (2), wherein the material discharging rack (1) includes a plurality of longitudinal brackets (11), the top surfaces of the longitudinal brackets (11) are inclined, and the longitudinal ribs are placed on the tops of the longitudinal brackets (11). The feeding mechanism (2) transports the transverse ribs to the longitudinal ribs on the longitudinal brackets (11), and the transverse ribs are moved by free rolling. The moving rack (4) moves the welding gun (7) to the intersection of the longitudinal ribs and the transverse ribs for welding. A transverse baffle (12) is provided at the rear end of the longitudinal bracket (11), a feeding frame (13) is provided between adjacent longitudinal brackets (11), the rear end of the feeding frame (13) is hinged to the transverse baffle (12), a hydraulic cylinder (17) is provided at the bottom of the front end of the feeding frame (13), a discharge trough (14) is provided on both the longitudinal bracket (11) and the feeding frame (13), the longitudinal ribs are placed in the discharge trough (14), an inclined plate (19) is provided at the top of the front end of the longitudinal bracket (11), and the discharge trough (14) on the longitudinal bracket (11) extends to the inner side of the inclined plate (19); The welding box (5) is provided with a welding displacement mechanism (6), which comprises a motor three (61), a swing rod (63) and a displacement shaft (64); a turntable (62) is provided at the output end of the motor three (61); an eccentric column (621) is provided at the bottom of the turntable (62); a driving groove (631) slidably matched with the eccentric column (621) is provided at one end of the swing rod (63); the other end of the swing rod (63) drives the displacement shaft (64) to rotate; a connecting rod (644) is obliquely provided at the bottom of the displacement shaft (64); a clamping ring (645) is provided at the end of the connecting rod (644); and a welding gun (7) is arranged on the clamping ring (645); The displacement shaft (64) is provided with a top column (646), the bottom of the welding box (5) is provided with an inclined ring platform (65), the end of the top column (646) contacts and cooperates with the bottom of the inclined ring platform (65), the top of the displacement shaft (64) is provided with a spline shaft (641), the middle section of the spline shaft (641) is provided with a partition (642), the end of the swing rod (63) is provided with a spline groove 1 (632), the spline groove 1 (632) cooperates with the spline shaft (641) above the partition (642), the bottom of the partition (642) is provided with a spring (643) connected to the welding box (5), a positioning ring (66) is rotatably provided at the through hole at the bottom of the welding box (5), and a spline groove 2 (661) is provided at the axis of the positioning ring (66) to cooperate with the spline shaft (641) below the partition (642); The feeding mechanism (2) comprises a motor 1 (21), a drive shaft (22) and a conveyor belt (23); the drive shaft (22) is rotatably arranged at the bottom of the front end of the longitudinal bracket (11); an output end of the motor 1 (21) is provided with a bevel tooth 1 (211); an end of the drive shaft (22) is provided with a bevel tooth 2 (221) meshing with the bevel tooth 1 (211); a lower rotating roller (231) and an upper rotating roller (232) are arranged on the inner side of the conveyor belt (23); a plurality of lower rotating rollers (231) are all connected to the drive shaft (22); the upper rotating roller (232) is rotatably arranged on the inclined plate (19); a plurality of angle plates (24) are evenly arranged on the outer side of the conveyor belt (23); the conveyor belt (23) pushes the steel bars onto the longitudinal bracket (11) through the angle plates (24).

2. The welding device for a railway hollow continuous rigid frame bridge according to claim 1, characterized in that: The movable frame (4) comprises two vertical frames (41), a cross beam (42) and a transverse platform (45). The two vertical frames (41) are respectively arranged at both ends of the cross beam (42). Wheels (411) are arranged at the bottom of the vertical frames (41). The transverse platform (45) is arranged on the cross beam (42) for transverse sliding. A driving structure (44) for driving the transverse platform (45) to move is arranged in the cross beam (42). The welding box (5) is arranged on the transverse platform (45) for vertical sliding. A cylinder (451) is arranged on the transverse platform (45). The output end of the cylinder (451) is connected to the top of the welding box (5).

3. The welding device for railway hollow continuous rigid frame bridge according to claim 2 is characterized in that: The driving structure (44) comprises a second motor (441), the output end of the second motor (441) is provided with a threaded column (442), and the transverse platform (45) is provided with a threaded hole that matches the threaded column (442).

4. The welding device for railway hollow continuous rigid frame bridge according to claim 2 is characterized in that: An alignment mechanism (43) is provided on the inner side of the stand (41), and the alignment mechanism (43) comprises a cylinder 1 (431). A push plate (432) is provided at the output end of the cylinder 1 (431), and a baffle 1 (433) is provided on the front side of the push plate (432).

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