Automatic longitudinal prestress threading device for continuous rigid frame bridge

Abstract

The present application relates to the technical field of threading device, and particularly discloses a continuous rigid frame bridge longitudinal prestress automatic threading device, which comprises a gear cavity, a plurality of gear sets are installed in the gear cavity, the gear sets comprise upper gears and lower gears arranged in an up-down mode, the corresponding upper gears and lower gears are engaged and matched, a wheel set structure for moving steel strands is arranged outside the gear cavity, a worm is horizontally rotatably arranged in the gear cavity, a turbine is coaxially fixed to each of the lower gears, the turbines are engaged and matched with the worm, and a drive motor for driving the worm to rotate is arranged at the side of the gear cavity. The present application can be spliced by multiple devices to meet the threading requirements of longer distances, i.e. multiple threading requirements, and is flexible and efficient in installation and setting, and can realize lifting by itself without the need of additional lifting equipment.

Description

Technical Field

[0001] This invention relates to the field of threading device technology, and more particularly to an automatic threading device for longitudinal prestressing of continuous rigid frame bridges. Background Technology

[0002] Prestressed steel strands are stranded steel cables composed of 2, 3, 7, or 19 high-strength steel wires, and undergo stress-relief treatment. They are suitable for prestressed concrete and similar applications. The main characteristics of prestressed steel strands are high strength and good relaxation performance; they also tend to be relatively straight when unwound. Continuous rigid frame bridges are a major bridge structure in highway transportation, capable of bearing large traffic loads and playing a crucial role in transportation. The longitudinal prestressing method of continuous rigid frame bridges has a key impact on their performance and durability. Longitudinal prestress is a force applied to the continuous rigid frame bridge by tensioning steel strands and other materials. Its main purpose is to shorten the span, increase stiffness, and improve the bridge's load-bearing capacity.

[0003] Most existing automatic prestressing strand threading devices for continuous rigid frame bridges are used for threading steel strands within a set specification range. Since the motor cannot be changed, it cannot handle situations exceeding its own threading requirements. Therefore, it cannot be effectively used in the face of changing construction environments and has poor flexibility.

[0004] Therefore, in order to solve such problems, we propose an automatic prestressing device for continuous rigid frame bridges. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an automatic prestressing device for longitudinal prestressing of continuous rigid frame bridges.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An automatic prestressing device for longitudinal prestressing of a continuous rigid frame bridge includes a gear cavity. Several gear sets are installed inside the gear cavity. Each gear set includes upper and lower gears arranged vertically. The upper and lower gears mesh with each other. A wheel structure for moving the steel strands is provided outside the gear cavity. A worm gear is provided inside the gear cavity for transverse rotation. Several lower gears are coaxially fixed with worm gears. Several worm gears mesh with the worm gear. A drive motor for driving the worm gear to rotate is provided on the side of the gear cavity.

[0008] The gear cavity is provided with a lubrication mechanism for lubricating steel strands on the side. Both ends of the worm pass through the gear cavity and are coaxially fixed with rollers. One roller is coaxially fixed with an insert block, and the other roller is provided with an insertion hole that matches the insert block. Both ends of the gear cavity are provided with a moving mechanism, and a support frame mechanism is provided outside the gear cavity.

[0009] Preferably, a support frame is fixed to the outside of the gear cavity, and there is a gap between the two ends of the support frame and the gear cavity. The drive motor is also fixedly connected to the support frame, and the two ends of the support frame are flush with the end faces of the two rollers respectively.

[0010] Preferably, the wheel assembly structure includes several rollers, which are coaxially corresponding to several upper gears and several lower gears and are detachably and fixedly connected.

[0011] Preferably, the gear cavity is fixed with an outer shell, which covers several rollers. A steel strand passes through between two corresponding upper and lower rollers. A first pipe and a second pipe are fixed horizontally at both ends of the outer shell. The steel strand passes through the inside of the first pipe and the second pipe. The first pipe and the second pipe can be fitted end-to-end and matched.

[0012] Preferably, the drive shaft of the drive motor passes through the side wall of the gear cavity and is coaxially fixed with a first bevel gear, and the worm is coaxially fixed with a second bevel gear, and the first bevel gear and the second bevel gear mesh and match.

[0013] Preferably, the lubrication mechanism includes a rectangular box disposed below the first pipe, with an opening below the first pipe. The rectangular box contains an oil cavity communicating with the opening below the first pipe. A brush wheel is rotatably disposed in the oil cavity. A third bevel gear is rotatably disposed at the bottom of the gear cavity. The third bevel gear meshes with the first bevel gear. The third bevel gear is connected to a reduction gear set for transmission. The brush wheel is connected to the reduction gear set for transmission.

[0014] Preferably, the moving mechanism includes two driving gears symmetrically arranged on one side of the support frame and two driven gears symmetrically arranged on the other side of the support frame. Both the driving gears and driven gears are rotatably connected to the support frame and are located at the top corner of the support frame. The inner sides of both ends of the support frame are fixed with first electric telescopic rods corresponding to the two driving gears respectively. The telescopic end of the first electric telescopic rod is fixed with a V-shaped frame. Both ends of the V-shaped frame are rotatably provided with driving pulleys. The driving gears are coaxially fixed with driven pulleys. The driven pulleys are connected to the two corresponding driving pulleys through belt drive. The first electric telescopic rod can drive the belt to abut against the side of the roller.

[0015] Preferably, the clamping mechanism includes a second electric telescopic rod fixedly disposed on the side of the gear cavity. The two second electric telescopic rods are vertically disposed and their telescopic ends are positioned opposite each other. Each telescopic end of the two second electric telescopic rods is rotatably provided with a squeezing wheel. A power motor is mounted on the side of the squeezing wheel. The power motor is slidably disposed with the gear cavity. The two squeezing wheels correspond to the positions of the two rollers respectively.

[0016] Preferably, the support frame mechanism ensures the rectangular frame, the support frame is located inside the rectangular frame, the support frame slides and matches the rectangular frame, and the four side rods of the rectangular frame are provided with racks, and the four racks correspond to and mesh with two driving gears and two driven gears respectively.

[0017] Preferably, four third electric telescopic rods are horizontally fixed at the bottom of the support frame. The four third electric telescopic rods are respectively aligned with the four side rods of the rectangular frame. Several positioning blocks are evenly fixed on the top and bottom of the side rods of the rectangular frame. The positioning blocks are provided with round holes, and the corresponding third electric telescopic rods can be inserted and matched with the round holes.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. In this invention, two or more support frames can be spliced ​​together, that is, by increasing the number of docking devices, the torque can be increased to meet various threading requirements, that is, it can meet the threading requirements of longer distances, and it is also easy to transport and move after being disassembled, occupying less operating space. The overall device is flexible in setting and has high working efficiency.

[0020] 2: In this invention, by setting a worm gear and several turbines, and setting a lubrication mechanism, when the drive motor starts and drives the threading operation, it can also drive the brush wheel to continuously brush lubricating oil onto the steel strand. The lubricating oil is conducive to the threading of the steel strand, and the brushing speed can be increased accordingly as the speed increases.

[0021] 3: In this invention, by setting up a moving mechanism, the starting effect of the drive motor can also drive the active gear to rotate, and then, in conjunction with the rack, it can drive the entire support frame to slide precisely on the rectangular frame, that is, to move up and down, so as to achieve precise height adjustment and achieve the effect of adjusting the working height of the steel strand. Attached Figure Description

[0022] Figure 1 This is the first isometric view of the present invention;

[0023] Figure 2 This is the second isometric view of the present invention;

[0024] Figure 3 This is a schematic diagram of the gear cavity structure of the present invention;

[0025] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0026] Figure 5 This is a schematic diagram of the upper gear, lower gear, and worm gear of the present invention;

[0027] Figure 6This is a schematic diagram of the first and second bevel gears of the present invention;

[0028] Figure 7 This is a schematic diagram of the roller structure of the present invention;

[0029] Figure 8 This is the front view of the present invention;

[0030] Figure 9 This is a schematic diagram of the structure after the two support frames of the present invention are connected.

[0031] In the diagram: 1. Gear cavity; 2. Upper gear; 3. Lower gear; 4. Worm gear; 5. Turbine; 6. Drive motor; 7. Roller; 8. Insert block; 9. Insertion hole; 10. Support frame; 11. Roller; 12. First bevel gear; 13. Second bevel gear; 14. Outer shell; 15. First pipe; 16. Second pipe; 17. Rectangular box; 18. Oil cavity; 19. Brush wheel; 20. Third bevel gear; 21. Reduction gear set; 22. Drive gear; 23. Driven gear; 24. First electric telescopic rod; 25. Drive pulley; 26. Driven pulley; 27. Second electric telescopic rod; 28. Extrusion wheel; 29. ​​Rectangular frame; 30. Third electric telescopic rod; 31. Positioning block. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] Reference Figure 1-9 An automatic prestressing cable threading device for longitudinal prestressing of continuous rigid frame bridges includes a gear cavity 1. The main body of the gear cavity 1 is a three-dimensional rectangle, providing a stable platform for the installation of other components. Several gear sets are installed inside the gear cavity 1, including upper gears 2 and lower gears 3 arranged vertically. The upper gears 2 and lower gears 3 mesh with each other and are rotatably connected to the gear cavity 1. A wheel assembly structure for moving the steel strands is provided outside the gear cavity 1. A worm gear 4 is laterally rotatable inside the gear cavity 1. Several lower gears 3 are coaxially fixed with worm gears 5, which mesh with the worm gear 4. The rotation of the worm gear 4 drives the worm gears 5 to rotate, which in turn drives the lower gears 3 to rotate, thereby driving the upper gears 2 to rotate in opposite directions. A drive motor 6 for driving the worm gear 4 is provided on the side of the gear cavity 1.

[0034] The gear cavity 1 has a lubrication mechanism for lubricating steel strands on its side. Both ends of the worm 4 pass through the gear cavity 1 and are coaxially fixed with rollers 7. One roller 7 is coaxially fixed with an insert block 8, and the other roller 7 has an insertion hole 9 that matches the insert block 8. When two gear cavities 1 are installed, they can be mated together, meaning there are two worms 4. When the two worms 4 are mated end-to-end, the corresponding insert block 8 will be inserted into the corresponding insertion hole 9. The insert block 8 has a polygonal cross-section. Both ends of the gear cavity 1 have moving mechanisms, and a support frame mechanism is provided outside the gear cavity 1.

[0035] As an optimized technical solution of the present invention, a support frame 10 is fixed to the outside of the gear cavity 1, and the support frame 10 is used to stably support the gear cavity 1. There is a gap between the two ends of the support frame 10 and the gear cavity 1; the support frame 10 is not fitted tightly to the gear cavity 1, but only its bottom is fixedly connected to the gear cavity 1. The drive motor 6 is also fixedly connected to the support frame 10, and the two ends of the support frame 10 are flush with the end faces of the two rollers 7. When the two gear cavities 1 are mated, the end faces of the two rollers 7 closest to one end abut against each other, and the corresponding insert 8 is inserted into the corresponding insertion hole 9. Furthermore, when the two gear cavities 1 are mated, the corresponding two support frames 10 can be bolted together.

[0036] As a technical optimization of the present invention, the wheel assembly structure includes a plurality of rollers 11, which are coaxially corresponding to and detachably fixedly connected to a plurality of upper gears 2 and a plurality of lower gears 3. That is, when the plurality of upper gears 2 and the plurality of lower gears 3 rotate, they can drive the corresponding plurality of rollers 11 to rotate. The plurality of rollers 11 can be disassembled and replaced, that is, damaged replacement or replacement of size specifications can be realized.

[0037] As an optimized technical solution of the present invention, a housing 14 is fixed to the outside of the gear cavity 1. The housing 14 covers several rollers 11 and serves a protective function. A steel strand passes through the space between two corresponding upper and lower rollers 11. When the two rollers 11 rotate, they are driven to rotate by corresponding upper gears 2 and lower gears 3, respectively. Since the rotation directions of the two rollers 11 are opposite, the steel strand between them can be squeezed out. A first pipe 15 and a second pipe 16 are horizontally fixed at both ends of the housing 14. The interiors of the first pipe 15 and the second pipe 16 are used to pass through the steel strand, i.e., to position the steel strand. The first pipe 15 and the second pipe 16 can be fitted end-to-end for mating. That is, when the two gear cavities 1 are mated, the first pipe 15 and the second pipe 16 can be fitted end-to-end for mating.

[0038] As a technical optimization of the present invention, the drive shaft of the drive motor 6 passes through the side wall of the gear cavity 1 and is coaxially fixed with a first bevel gear 12, and the worm gear 4 is coaxially fixed with a second bevel gear 13, with the first bevel gear 12 and the second bevel gear 13 meshing and matching. The drive motor 6 drives the first bevel gear 12 to rotate, which in turn drives the second bevel gear 13 to rotate, and finally drives the worm gear 4 to rotate.

[0039] As an optimized technical solution of the present invention, the lubrication mechanism includes a rectangular box 17 disposed below the first pipe 15. An opening is provided below the first pipe 15. An oil chamber 18 communicating with the opening below the first pipe 15 is provided inside the rectangular box 17. An oil filling port communicating with the oil chamber 18 is also provided on the side wall of the rectangular box 17. The oil chamber 18 is used to hold lubricating oil. A brush wheel 19 is rotatably disposed inside the oil chamber 18. A third bevel gear 20 is rotatably disposed at the bottom of the gear cavity 1. The third bevel gear 20 meshes with and is matched with the first bevel gear 12. A reduction gear set 21 is matched and driven by the third bevel gear 20. The brush wheel 19 is matched and driven by the reduction gear set 21. The reduction gear set 21 consists of multiple meshing gears, enabling the rotation of the third bevel gear 20 to drive the rotation of the brush wheel 19, and the rotational speed of the brush wheel 19 is lower than that of the third bevel gear 20. The rotation of the first bevel gear 12 drives the rotation of the third bevel gear 20, which in turn drives the brush wheel 19 to rotate via the reduction gear set 21. The rotation of the brush wheel 19 continuously brushes the lubricating oil in the oil chamber 18 onto the steel strand, which facilitates the threading of the steel strand. The brushing speed also increases with the speed of rotation.

[0040] As a technical optimization of the present invention, the moving mechanism includes two driving gears 22 symmetrically arranged on one side of the support frame 10 and two driven gears 23 symmetrically arranged on the other side of the support frame 10. The two driving gears 22 and the two driven gears 23 are symmetrically arranged. Both the driving gears 22 and the driven gears 23 are rotatably connected to the support frame 10 and located at the top corner of the support frame 10. First electric telescopic rods 24, corresponding to the two driving gears 22, are fixed to the inner sides of both ends of the support frame 10. A V-shaped frame is fixed to the telescopic end of the first electric telescopic rod 24. Driving pulleys 25 are rotatably provided at both ends of the V-shaped frame. Driven pulleys 26 are coaxially fixed to the driving gears 22. The driven pulleys 26 are connected to the corresponding two driving pulleys 25 via belt drive. The two driving pulleys 25 and the driven pulleys 26 can effectively support the belt. The first electric telescopic rods 24 can drive the belt to abut against the side of the roller 7. A support plate is fixed to the support frame 10 to support and position the belt. When the first electric telescopic rod 24 drives the belt to abut against the side of the roller 7, the rotation of the roller 7 drives the belt drive, thereby driving the driven pulley 26 to rotate, and then driving the drive gear 22 to rotate. After the first electric telescopic rod 24 retracts, the rotation of the roller 7 will not affect the drive gear 22.

[0041] As an optimized technical solution of the present invention, the clamping mechanism includes two second electric telescopic rods 27 fixedly disposed on the side of the gear cavity 1. The two second electric telescopic rods 27 are vertically arranged, and their telescopic ends are positioned opposite each other. Each telescopic end of the two second electric telescopic rods 27 is rotatably equipped with a pressing wheel 28. A power motor is mounted on the side of the pressing wheel 28, and the power motor is slidably installed with the gear cavity 1, allowing it to slide. The two pressing wheels 28 correspond to the positions of the two rollers 11. The two second electric telescopic rods 27 can drive the corresponding two pressing wheels 28 to move, and the two pressing wheels 28 can press the steel strand between them, thus positioning and fixing the steel strand. Simultaneously, when the two power motors are started, they can drive the corresponding pressing wheels 28 to rotate, thereby moving the steel strand.

[0042] As a technical optimization of the present invention, the support frame mechanism ensures the rectangular frame 29, with the support frame 10 located inside the rectangular frame 29. The support frame 10 and the rectangular frame 29 are slidably matched. Each of the four side rods of the rectangular frame 29 is equipped with a rack, and the four racks correspond to and mesh with two driving gears 22 and two driven gears 23, respectively. When the two driving gears 22 rotate, in conjunction with the racks, they can drive the support frame 10 to slide and move up and down on the rectangular frame 29.

[0043] As a technical optimization of the present invention, four third electric telescopic rods 30 are horizontally fixed at the bottom of the support frame 10. The four third electric telescopic rods 30 are respectively aligned with the four side rods of the rectangular frame 29. Several positioning blocks 31 are evenly fixed at the top and bottom of the side rods of the rectangular frame 29. The positioning blocks 31 are provided with round holes, and the corresponding third electric telescopic rods 30 can be inserted into the round holes. The support frame 10 can be precisely moved and controlled so that the four third electric telescopic rods 30 at its bottom are respectively aligned with the four positioning blocks 31, and the third electric telescopic rods 30 can be extended and retracted into the round holes of the positioning blocks 31, thereby positioning and fixing the support frame 10.

[0044] In use, during the steel strand threading operation, the steel strand is inserted into the equipment. The first pipe 15 and the second pipe 16 position the steel strand, which enters through the second pipe 16 and exits through the first pipe 15. The steel strand is positioned between several corresponding upper and lower rollers 11. Notably, these rollers 11 are removable and replaceable, allowing for replacement due to damage or size variations, ensuring effective threading of the specified steel strand. Specifically, the drive motor 6 rotates the first bevel gear 12, which in turn rotates the second bevel gear 13, ultimately driving the worm gear 4. The worm gear 4 rotates several worm gears 5, which in turn rotate several lower gears 3, which in turn rotate several upper gears 2 in opposite directions. Since the two corresponding upper and lower rollers 11 are driven to rotate by their respective upper and lower gears 2 and 3, and their rotation directions are opposite, the steel strand positioned between them is compressed and continuously pushed in one direction.

[0045] As the steel strand is continuously advanced, the rotation of the first bevel gear 12 also drives the rotation of the third bevel gear 20. The third bevel gear 20 drives the brush wheel 19 to rotate through the reduction gear set 21. The rotation of the brush wheel 19 can continuously brush the lubricating oil in the oil chamber 18 onto the steel strand, and the lubricating oil is beneficial to the strand threading operation.

[0046] Meanwhile, after the stranding of the steel strands at this height is completed, the support frame 10 can be automatically raised and lowered. That is, the support frame 10 moves on the rectangular frame 29 to adjust the working height of the steel strands without the need for additional lifting equipment. First, the steel strands that have been threaded at this height are cut. Then, the rollers 11 are activated to push the steel strands in the opposite direction between the two pressing rollers 28. The two second electric telescopic rods 27 are activated to drive the corresponding two pressing rollers 28 to move. The two pressing rollers 28 can press the steel strands in between, thereby fixing the steel strands. It is worth noting that the position of pressing the steel strands is close to the end of the steel strands. At this time, there are no steel strands between the rollers 11. Then, the first electric telescopic rods 24 at both ends drive the belt to abut against the side of the roller 7, and the third electric telescopic rod 30 at the bottom of the support frame 10 is pulled out of the round hole of the positioning block 31. At this time, the support frame 10 can move. Since the belt abuts against the roller 7, the driven pulley 26 will not rotate, that is, the driving gear 22 cannot rotate, and the entire support frame 10 is positioned on the rectangular frame 29. Then, the drive motor 6 controls the worm gear 4 to rotate, which in turn controls the roller 7 to rotate. The roller 7 can drive the belt drive by abutting against the belt, thereby driving the driven pulley 26 to rotate, which in turn drives the driving gear 22 to rotate. At this time, the driving gear 22 rotates accordingly. The rotation of the two driving gears 22, in conjunction with the rack effect, can drive the entire support frame 10 to slide precisely on the rectangular frame 29, that is, to move up and down, so as to achieve precise height adjustment. After each movement and adjustment, the four third electric telescopic rods 30 at the bottom of the support frame 10 align with the four positioning blocks 31, and the third electric telescopic rods 30 extend and retract into the round holes of the positioning blocks 31, thereby fixing the support frame 10 and ensuring its stability. During the threading operation, the two extrusion rollers 28 extrude the steel strand, and the corresponding two power motors start, driving the corresponding extrusion rollers 28 to rotate, moving the steel strand into the space between several rollers 11. Then, the two second electric telescopic rods 27 drive the corresponding two extrusion rollers 28 to separate, and the corresponding first electric telescopic rod 24 drives the belt to separate from the side of the roller 7. The rotation of the roller 7 does not affect the drive gear 22, at which point normal threading can be performed.

[0047] This device can also be used to splice two or more support frames 10. Specifically, two gear cavities 1 are mated together, and the corresponding two support frames 10 can be bolted together. At this time, the corresponding two worm gears 4 are mated end-to-end, meaning the end faces of the two rollers 7 closest to one end abut against each other. The corresponding inserts 8 are inserted into the corresponding insertion holes 9, and the corresponding first pipe 15 and second pipe 16 are mated end-to-end. Simultaneously, two drive motors 6 start synchronously, driving the corresponding worm gears 4 to rotate. The two worm gears 4 are connected in pairs, effectively increasing torque and enabling longer-distance strand threading operations. By increasing the number of mating devices, torque can be increased to meet various threading requirements, including higher threading demands. Furthermore, after disassembly, it is easy to transport and move, occupying less space, and the overall device setup is flexible. Similarly, when the number of mating support frames 10 is increased, the corresponding number of rectangular frames 29 can also be set accordingly, and the two rectangular frames 29 can be threaded together.

[0048] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automatic prestressing tendon threading device for a continuous rigid frame bridge, comprising a gear cavity (1), characterized in that, The gear cavity (1) is equipped with several gear sets, including an upper gear (2) and a lower gear (3) arranged vertically. The upper gear (2) and the lower gear (3) mesh with each other. The gear cavity (1) is equipped with a wheel set structure for moving the steel strand. The gear cavity (1) is equipped with a worm gear (4) that rotates laterally inside. Several lower gears (3) are all coaxially fixed with turbines (5). Several turbines (5) mesh with the worm gear (4). The gear cavity (1) is equipped with a drive motor (6) on the side for driving the worm gear (4) to rotate. The gear cavity (1) is provided with a lubrication mechanism for lubricating steel strands on its side. Both ends of the worm (4) pass through the gear cavity (1) and are coaxially fixed with rollers (7). One roller (7) is coaxially fixed with a plug (8), and the other roller (7) is provided with a plug hole (9) that matches the plug (8). Both ends of the gear cavity (1) are provided with a moving mechanism, and the gear cavity (1) is provided with a support frame mechanism on its exterior. The gear cavity (1) is fixed with a support frame (10) on the outside. There is a gap between the two ends of the support frame (10) and the gear cavity (1). The drive motor (6) is also fixedly connected to the support frame (10). The two ends of the support frame (10) are flush with the end faces of the two rollers (7). The wheel assembly structure includes several rollers (11), which are coaxially connected to several upper gears (2) and several lower gears (3) respectively and can be detachably fixed. The gear cavity (1) is fixed with a shell (14) on the outside. The shell (14) covers several rollers (11). The upper and lower corresponding rollers (11) are used to pass through the steel strand. The shell (14) is horizontally fixed with a first pipe (15) and a second pipe (16) at both ends. The first pipe (15) and the second pipe (16) are used to pass through the steel strand. The first pipe (15) and the second pipe (16) can be fitted and matched end to end. The moving mechanism includes two driving gears (22) symmetrically arranged on one side of the support frame (10) and two driven gears (23) symmetrically arranged on the other side of the support frame (10). The driving gears (22) and driven gears (23) are rotatably connected to the support frame (10) and are located at the top corner of the support frame (10). The inner sides of both ends of the support frame (10) are fixed with first electric telescopic rods (24) corresponding to the two driving gears (22). The telescopic end of the first electric telescopic rod (24) is fixed with a V-shaped frame. Both ends of the V-shaped frame are rotatably provided with driving pulleys (25). The driving gears (22) are coaxially fixed with driven pulleys (26). The driven pulleys (26) are connected to the two corresponding driving pulleys (25) through belt drive. The first electric telescopic rod (24) can drive the belt to abut against the side of the roller (7).

2. The automatic prestressing tendon threading device for continuous rigid frame bridges according to claim 1, characterized in that, The drive shaft of the drive motor (6) passes through the side wall of the gear cavity (1) and is coaxially fixed with the first bevel gear (12). The worm (4) is coaxially fixed with the second bevel gear (13). The first bevel gear (12) and the second bevel gear (13) mesh and match.

3. The automatic prestressing tendon threading device for continuous rigid frame bridges according to claim 2, characterized in that, The lubrication mechanism includes a rectangular box (17) located below the first pipe (15). The first pipe (15) has an opening below it. The rectangular box (17) has an oil chamber (18) inside that communicates with the opening below the first pipe (15). A brush wheel (19) is rotatably arranged inside the oil chamber (18). A third bevel gear (20) is rotatably arranged at the bottom of the gear cavity (1). The third bevel gear (20) meshes with the first bevel gear (12). The third bevel gear (20) is matched with a reduction gear set (21) for transmission. The brush wheel (19) is matched with the reduction gear set (21) for transmission.

4. The automatic prestressing tendon threading device for continuous rigid frame bridges according to claim 1, characterized in that, The clamping mechanism includes a second electric telescopic rod (27) fixedly installed on the side of the gear cavity (1). The two second electric telescopic rods (27) are vertically arranged, and the telescopic ends of the two second electric telescopic rods (27) are arranged opposite each other. Each telescopic end of the two second electric telescopic rods (27) is provided with a squeezing wheel (28). A power motor is installed on the side of the squeezing wheel (28). The power motor is slidably installed with the gear cavity (1). The two squeezing wheels (28) correspond to the positions of the two rollers (11) respectively.

5. The automatic prestressing tendon threading device for continuous rigid frame bridges according to claim 1, characterized in that, The support frame mechanism includes a rectangular frame (29), a support frame (10) located inside the rectangular frame (29), the support frame (10) and the rectangular frame (29) are slidably matched, and the four side rods of the rectangular frame (29) are provided with racks, and the four racks correspond to and mesh with two driving gears (22) and two driven gears (23) respectively.

6. The automatic prestressing tendon threading device for continuous rigid frame bridges according to claim 5, characterized in that, The bottom of the support frame (10) is horizontally fixed with four third electric telescopic rods (30). The four third electric telescopic rods (30) are respectively aligned with the four side rods of the rectangular frame (29). The side rods of the rectangular frame (29) are evenly fixed with a number of positioning blocks (31) on the top and bottom. The positioning blocks (31) are provided with round holes, and the corresponding third electric telescopic rods (30) can be inserted and matched with the round holes.

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