Suspension bridge cable torsion and strand length difference detection and adjustment device and method
By combining laser positioning and a worm gear rotation mechanism with an internal wire resistance length measurement method, the system achieves automated and precise detection and adjustment of cable torsion and strand length differences in suspension bridges. This solves the problems of low cable installation accuracy and safety hazards, and improves the load-bearing capacity and service life of suspension bridges.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CCCC SECOND HIGHWAY ENG CO LTD
- Filing Date
- 2026-03-31
- Publication Date
- 2026-07-21
AI Technical Summary
Existing technologies cannot accurately detect and adjust the torsion of suspension bridge cables and the difference in the length of steel strands, resulting in low installation accuracy, significant safety hazards, poor versatility of detection and adjustment equipment, complex operation, and insufficient safety.
By employing laser positioning and a worm gear rotation mechanism in conjunction with surface markings on the sling, the system achieves automated and precise detection and synchronous correction of the sling's torsion angle. It also accurately detects the length difference of the steel strands through a built-in wire resistance length measurement method, and achieves quantitative measurement and elimination of the length difference of the steel strands through segmented micro-tensioning adjustment.
It enables precise detection and automatic correction of the sling torsion angle, eliminates the hidden dangers of additional bending moment and anti-corrosion layer wear, improves the load-bearing capacity and service life of the sling, and is compatible with slings of different lengths and specifications, thus improving the accuracy and safety of detection and adjustment.
Smart Images
Figure CN122428591A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of suspension bridge construction equipment technology, specifically to a device and method for detecting and adjusting the torsion of suspension bridge cables and the difference in the length of steel strands. Background Technology
[0002] As the core structural form of long-span bridges, suspension bridges rely heavily on their suspenders as key force-transmitting components. These suspenders play a crucial role in transferring the weight of the stiffening girder, bridge deck loads, and wind loads to the main cables. The installation accuracy and structural integrity of the suspenders directly determine the load-bearing capacity, service safety, and lifespan of the suspension bridge. Suspension bridge suspenders are typically composed of multiple high-strength steel strands twisted together. A single suspender can be tens or even hundreds of meters long and is quite heavy. To facilitate transportation from the factory to the construction site, the suspenders are rolled into a ring structure before leaving the factory, reducing the space required for transportation and lowering transportation difficulty and costs.
[0003] However, during the winding and transportation of the sling, the circular winding causes uneven compressive, bending, and torsional stresses on the internal steel strands. Even if the sling is straightened as a whole at the construction site using tensioning equipment, the residual deformation caused by these stresses cannot be completely eliminated. On the one hand, the entire sling will experience slight torsion due to the uneven force during winding, causing it to fail to maintain the designed vertical posture after installation. This results in additional bending moments at the connection nodes with the main cable and stiffening beam, which can easily lead to fatigue damage at the nodes during long-term service. At the same time, the torsion will exacerbate the wear of the anti-corrosion coating on the sling surface, shortening the sling's service life. On the other hand, the material uniformity and stranding position of each steel strand have slight differences. The bending radius and stress of each steel strand during winding are different, resulting in a small but not negligible length difference between the steel strands after straightening. This length difference will cause uneven stress on each steel strand after the sling is installed and tensioned. Some steel strands will prematurely fail due to fatigue caused by overload, while others will not be able to fully perform their load-bearing function due to insufficient force, seriously affecting the overall load-bearing performance of the sling and creating potential safety hazards for the bridge.
[0004] To address the aforementioned issues, the industry currently lacks dedicated integrated testing and adjustment technology and equipment. Related methods are rather crude and have numerous shortcomings: cable torsion testing often relies on manual visual observation or simple ruler comparison, failing to quantify torsion parameters and leading to frequent misjudgments and omissions; the length difference of steel strands cannot be directly and accurately measured, only indirectly inferred from overall tension elongation, resulting in significant errors; the testing and adjustment processes are disconnected, leading to haphazard adjustments with low accuracy and efficiency; existing simple equipment lacks versatility, only adapting to specific cable specifications, and is complex to operate and lacks safety. Therefore, there is an urgent need to develop a dedicated integrated testing and adjustment device to solve the problem of residual deformation after cable winding and transportation, ensuring the quality of cable installation. Summary of the Invention
[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a device and method for detecting and adjusting the torsion of suspension bridge cables and the length difference of internal steel strands. This device and method can accurately detect and synchronously adjust the overall torsion state of the suspension cables and the length difference of internal steel strands after the suspension bridge cables are transported from the factory to the construction site, thereby ensuring the installation accuracy of the cables and the service safety of the suspension bridge. This invention also solves the problems mentioned in the background technology.
[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a suspension bridge cable torsion and strand length difference detection and adjustment device, comprising a frame and a slide rail, the slide rail being fixedly mounted on the upper surface of the frame, a length difference detection device being fixedly mounted at one end of the upper surface of the frame, a plurality of cable positioning mechanisms being slidably mounted from left to right on the upper side of the slide rail, a rotating sleeve being rotatably mounted in the middle of the cable positioning mechanism, a cavity being opened in the middle of the cable positioning mechanism, a rotating mechanism for driving the rotating sleeve to rotate being mounted inside the cavity, a cable clamping mechanism being mounted inside the rotating sleeve, a cable body being threaded between the plurality of cable positioning mechanisms and the length difference detection device, and wires of the same length as the cable being mounted around the cable body.
[0007] Preferably, the rotating mechanism includes a worm gear and a worm. The worm gear is disposed inside the cavity and is fixedly sleeved to the outer wall of the rotating sleeve. The worm is meshed on one side of the worm gear, and both ends of the worm are rotatably connected to the inner wall of the corresponding cavity via bearings. A first bevel gear is fixedly sleeved on the lower end of the worm. A side plate is fixedly provided on the lower inner wall of the cavity and on one side of the worm. A transmission rod is rotatably sleeved on the middle of the side plate. A second bevel gear is fixedly sleeved on the end of the transmission rod near the worm. The first bevel gear and the second bevel gear mesh with each other. A motor is fixedly provided on the side of the side plate away from the transmission rod, and the output end of the motor is fixedly connected to one end of the transmission rod.
[0008] Preferably, the sling clamping mechanism includes rotating bars and clamping blocks. A transmission ring is rotatably disposed on the front outer wall of the rotating sleeve. Multiple rotating rods are arranged in a circular array around the center of the rotating sleeve on the inner side of the transmission ring. The rear ends of the multiple rotating rods are rotatably connected to the front outer wall of the rotating sleeve. Multiple rotating bars are fixedly sleeved on the front ends of the corresponding rotating rods. Multiple clamping blocks are fixedly disposed at the ends of the rotating bars away from the rotating rods. A drive ring is concentrically rotatably connected to the front side of the rotating sleeve. An internal gear ring is fixedly sleeved on the inner wall of the drive ring. Gears are fixedly sleeved on the front ends of the multiple rotating rods. The internal gear ring meshes with the multiple gears. An annular groove is formed inside the rotating sleeve. A drive mechanism for rotating the multiple drive rings is disposed inside the annular groove.
[0009] Preferably, the driving mechanism includes an electric push rod and an arc-shaped transmission block. The front inner wall of the annular groove has an arc-shaped opening, and the rear inner wall of the annular groove has an arc-shaped groove. The arc-shaped transmission block is slidably disposed inside the arc-shaped groove. A connecting rod is fixedly disposed on the front side of the arc-shaped transmission block. The front end of the connecting rod passes through the arc-shaped opening and is fixedly connected to the transmission ring. The electric push rod is disposed inside the annular groove and located on one side of the arc-shaped groove. A rotating block is fixedly disposed at the tail end of the electric push rod. An installation rod is fixedly sleeved inside the rotating block. One end of the installation rod is rotatably connected to the inner wall of the annular groove. A connecting ring is fixedly disposed at the end of the piston rod of the electric push rod. The connecting ring is rotatably sleeved with the outer wall of the connecting rod.
[0010] Preferably, an arc-shaped limiting groove is formed on one inner wall of the arc-shaped groove, and an arc-shaped limiting block is slidably arranged inside the arc-shaped limiting groove. One side of the arc-shaped limiting block is fixedly connected to the arc-shaped transmission block.
[0011] Preferably, the motor is a geared motor.
[0012] Preferably, the outer walls of the plurality of clamping blocks are provided with anti-slip textures.
[0013] Preferably, the length difference detection device is equipped with a laser positioning device inside, and the outer wall of the sling is provided with four vertical lines arranged in a circular array with the center of the sling as the axis, and five circular marks are arranged on the outer wall of the sling from top to bottom.
[0014] A method for detecting and adjusting the torsion of suspension bridge cables and the difference in the length of steel strands, using a device for detecting and adjusting the torsion of suspension bridge cables and the difference in the length of steel strands as described above, includes the following steps: Step 1: Pass the sling through multiple sling positioning mechanisms and length difference detection devices in sequence, and clamp and fix the sling using the sling clamping mechanism; Step 2: Using the laser positioning device inside the length difference detection device, along with the four vertical lines and five ring marks pre-set on the outer wall of the sling, automatically track and compare the alignment of the laser beam with the intersection of the vertical lines and ring marks. If the beam is not completely aligned with the intersection, it is determined that the sling is twisted as a whole. Step 3: Based on the judgment result of Step 2, control the rotating mechanism to drive the rotating sleeve to rotate the sling clamping mechanism and the sling until the laser is completely aligned with all intersections and the four vertical lines on the sling surface are restored to a vertical state, thus completing the automatic return of the sling torsion. Step 4: Collect the resistance values of multiple wires of the same length as the steel strands inside the sling using a length difference detection device. Calculate the actual length of the corresponding steel strands based on the proportional relationship between resistance and length. Determine the length difference of the steel strands by comparing the resistance differences of the multiple wires and locate the position of the shorter steel strand. Step 5: Based on the test results of Step 4, perform micro-level tensioning on the steel strands that are too short. During the tensioning process, continuously collect the resistance value of the built-in wires and calculate the corresponding steel strand length in real time. When the resistance values of multiple built-in wires are completely consistent, it is determined that the corresponding steel strand lengths are consistent, and tensioning is stopped to complete the automatic adjustment of the steel strand length difference. Step 6: After completing the torsion correction and length difference adjustment, a second verification test is performed. After confirming that the sling is not twisted and the length difference of the steel strands is zero, the sling clamping mechanism is automatically released to complete the test and adjustment operation.
[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a device for detecting and adjusting the torsion of suspension bridge cables and the difference in the length of steel strands, which has the following advantages: 1. The suspension bridge cable torsion and strand length difference detection and adjustment device uses laser positioning and worm gear rotation mechanism in conjunction with cable surface markings to achieve automated and accurate detection and synchronous correction of cable torsion angle. This solves the problems of large errors and blind adjustments caused by manual visual inspection, ensures the vertical installation posture of the cable, and eliminates the hidden dangers of additional bending moment and anti-corrosion layer wear.
[0016] 2. The suspension bridge cable torsion and strand length difference detection and adjustment device accurately detects the length of each strand through the built-in wire resistance length measurement method. Combined with segmented micro-tensioning adjustment, it realizes the quantitative measurement and accurate elimination of strand length difference, avoids fatigue fracture caused by uneven stress, and greatly improves the load-bearing performance and service life of the cable.
[0017] 3. The suspension bridge cable torsion and strand length difference detection and adjustment device adopts a multi-segment movable clamping and positioning mechanism, which can be adapted to suspension bridge cables of different lengths and specifications, and has strong versatility. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of a suspension bridge cable torsion and steel strand length difference detection and adjustment device proposed in this invention; Figure 2 for Figure 1 Front view of the sling positioning mechanism; Figure 3 for Figure 2 Internal structure diagram Figure 4 for Figure 2 Enlarged view of part A of the structure; Figure 5 for Figure 3 Enlarged view of part B of the structure.
[0019] In the diagram: 1. Frame; 2. Length difference detection device; 3. Sling positioning mechanism; 4. Rotating sleeve; 5. Slide rail; 6. Rotating rod; 7. Gear; 8. Internal gear ring; 9. Rotating bar; 10. Clamping block; 11. Transmission ring; 12. Worm gear; 13. First bevel gear; 14. Worm; 15. Transmission rod; 16. Side plate; 17. Second bevel gear; 18. Motor; 19. Arc-shaped transmission block; 20. Connecting rod; 21. Connecting ring; 22. Mounting rod; 23. Rotating block; 24. Electric push rod; 25. Arc-shaped limit block. Detailed Implementation
[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0021] Please see Figure 1-5 A suspension bridge cable torsion and strand length difference detection and adjustment device includes a frame 1 and a slide rail 5. The slide rail 5 is fixedly mounted on the upper surface of the frame 1. A length difference detection device 2 is fixedly mounted at one end of the upper surface of the frame 1. Multiple cable positioning mechanisms 3 are slidably mounted from left to right on the upper side of the slide rail 5. A rotating sleeve 4 is rotatably mounted in the middle of the cable positioning mechanism 3. A cavity is opened in the middle of the cable positioning mechanism 3, and a rotating mechanism that drives the rotating sleeve 4 to rotate is set inside the cavity. A cable clamping mechanism is set inside the rotating sleeve 4. A cable body is inserted between the multiple cable positioning mechanisms 3 and the length difference detection device 2. Wires of the same length as the cable are arranged around the cable body. A laser positioning device is set inside the length difference detection device 2. Four vertical markings are arranged in a circular array around the center of the cable, and five circular markings are arranged from top to bottom on the outer wall of the cable. The marking lines are made of high-contrast paint or reflective material. Each sling positioning mechanism 3 has a slider at its bottom that mates with the slide rail 5. The slider contains a locking mechanism, such as an electromagnetic lock or a manual locking bolt, to secure the sling positioning mechanism 3 to its set position on the slide rail 5 before adjustment. The slide rail 5 has length markings on its surface, facilitating quick positioning of the spacing between multiple sling positioning mechanisms 3 according to the sling length. A slewing bearing is provided between the rotating sleeve 4 and the sling positioning mechanism 3 to ensure smooth rotation under high loads, preventing eccentricity or jamming. The laser positioning device includes at least two laser emitters that project cross-shaped beams of light, forming multiple intersection points with four vertical lines and five circular marks on the sling surface. An industrial camera and image processing algorithm automatically identify the offset of the laser beams at the intersection points and calculate the torsion angle with an accuracy of ±0.5°.
[0022] Please see Figure 1-5 The rotating mechanism includes a worm gear 12 and a worm 14. The worm gear 12 is disposed inside the cavity and is fixedly sleeved to the outer wall of the rotating sleeve 4. The worm 14 is meshed on one side of the worm gear 12. Both ends of the worm 14 are rotatably connected to the inner wall of the corresponding cavity through bearings. A first bevel gear 13 is fixedly sleeved on the lower end of the worm 14. A side plate 16 is fixedly disposed on the lower inner wall of the cavity and on one side of the worm 14. A transmission rod 15 is rotatably sleeved on the middle of the side plate 16. A second bevel gear 17 is fixedly sleeved on the end of the transmission rod 15 near the worm 14. The first bevel gear 13 and the second bevel gear 17 are meshed. A motor 18 is fixedly disposed on the side of the side plate 16 away from the transmission rod 15. The output end of the motor 18 is fixedly connected to one end of the transmission rod 15. The motor 18 is a geared motor.
[0023] Please see Figure 1-5 The sling clamping mechanism includes a rotating bar 9 and a clamping block 10. A transmission ring 11 is rotatably mounted on the front outer wall of the rotating sleeve 4. Multiple rotating rods 6 are arranged in a circular array around the center of the rotating sleeve 4 on the inner side of the transmission ring 11. The rear ends of the multiple rotating rods 6 are rotatably connected to the front outer wall of the rotating sleeve 4. Multiple rotating bars 9 are fixedly sleeved on the front ends of the corresponding rotating rods 6. Multiple clamping blocks 10 are fixedly mounted on the ends of the rotating bars 9 away from the rotating rods 6. The outer walls of the multiple clamping blocks 10 are provided with anti-slip textures. A drive ring 11 is concentrically rotatably connected to the front side of the rotating sleeve 4. An internal gear ring 8 is fixedly sleeved on the inner wall of the drive ring 11. Gears 7 are fixedly sleeved on the front ends of the multiple rotating rods 6. The internal gear ring 8 meshes with the multiple gears 7. An annular groove is opened inside the rotating sleeve 4. A drive mechanism that drives the multiple drive rings 11 to rotate is set inside the annular groove. The clamping surfaces of multiple clamping blocks 10 are designed with an arc shape to fit against the outer wall of the sling. The clamping blocks 10 are embedded with flexible and wear-resistant materials such as polyurethane rubber to prevent damage to the anti-corrosion layer on the sling surface during clamping. Rolling elements or sliding bearings are provided between the drive ring 11 and the rotating sleeve 4 to ensure smooth rotation of the drive ring 11.
[0024] Please see Figure 1-5The driving mechanism includes an electric push rod 24 and an arc-shaped transmission block 19. An arc-shaped opening is formed on the front inner wall of the annular groove, and an arc-shaped groove is formed on the rear inner wall of the annular groove. The arc-shaped transmission block 19 is slidably disposed inside the arc-shaped groove. A connecting rod 20 is fixedly disposed on the front side of the arc-shaped transmission block 19. The front end of the connecting rod 20 passes through the arc-shaped opening and is fixedly connected to the transmission ring 11. The electric push rod 24 is disposed inside the annular groove and located on one side of the arc-shaped groove. A rotating block 23 is fixedly disposed at the tail end of the electric push rod 24. An installation rod 22 is fixedly sleeved inside the rotating block 23. One end of the installation rod 22 is rotatably connected to the inner wall of the annular groove. A connecting ring 21 is fixedly disposed at the end of the piston rod of the electric push rod 24. The connecting ring 21 is rotatably sleeved with the outer wall of the connecting rod 20. An arc-shaped limiting groove is formed on one side inner wall of the arc-shaped groove. An arc-shaped limiting block 25 is slidably disposed inside the arc-shaped limiting groove. One side of the arc-shaped limiting block 25 is fixedly connected to the arc-shaped transmission block 19.
[0025] In summary, the suspension bridge cable torsion and strand length difference detection and adjustment device, when in use, involves passing the cable through multiple cable positioning mechanisms 3 and length difference detection devices 2, and activating the electric push rod 24. This push rod 24 drives the arc-shaped transmission block 19, causing the transmission ring 11 to rotate. The internal gear ring 8 on the inner wall of the transmission ring 11 drives multiple gears 7 to rotate, thereby causing multiple rotating bars 9 to rotate, which in turn drives multiple clamping blocks 10 to clamp the cable. Four longitudinal marks and five circumferential marks are pre-set on the outer wall of the cable. The device projects light in real time through a laser positioning device to automatically track and align with the longitudinal marks. The intersection points with the circumferential marks are recorded; when the light is not fully aligned with the intersection points, it is determined that the sling has an overall twist; the control system drives the rotating mechanism to drive the clamping mechanism to rotate synchronously, that is, the motor 18 drives the second bevel gear 17 to rotate, which in turn drives the first bevel gear 13 to rotate, which in turn drives the worm gear 14 to rotate the worm wheel 12, thereby causing the rotating sleeve 4 to rotate, thus realizing the twist of the sling, until the laser is fully aligned with all intersection points, and the four longitudinal marks on the sling surface return to a vertical state, that is, the automatic return of the sling to its original position is completed; the principle of steel strand length difference detection is that the sling is evenly distributed inside. Built-in wires of the same length as the steel strands are used. Based on the principle that resistance is proportional to length: the length difference detection device 2 collects the resistance values of multiple built-in wires in real time, and calculates the actual length of the corresponding steel strand by converting the resistance values; by comparing the resistance differences of multiple wires, the length difference of the steel strands can be accurately determined, and the position of the shorter steel strand can be located; the steel strand length difference adjustment principle control system drives the micro-tensioning adjustment mechanism to perform micro-level tensioning of the shorter steel strand based on the detected length difference data; during the tensioning process, the length detection mechanism continuously collects the resistance values of the built-in wires in real time, and calculates the resistance value of the shorter steel strand in real time. The length of the steel strands should be considered. When the resistance values of multiple built-in wires are completely consistent, it is determined that the corresponding steel strand lengths are consistent, and tensioning is stopped, completing the automatic adjustment of the steel strand length difference. The overall collaborative working principle is that after the sling clamping mechanism automatically completes the clamping and positioning of the sling, the torsion detection and adjustment module and the steel strand length difference detection and adjustment module work synchronously. First, the overall torsion of the sling is returned to the correct position, and then the slight tensioning adjustment of the steel strand length difference is performed. After the adjustment is completed, the device automatically performs a second verification test. After confirming that the sling has no torsion and the steel strand length difference is zero, the clamping mechanism is automatically released, completing all detection and adjustment operations.
[0026] A method for detecting and adjusting the torsion of suspension bridge cables and the difference in the length of steel strands, using a device for detecting and adjusting the torsion of suspension bridge cables and the difference in the length of steel strands as described above, includes the following steps: Step 1: Pass the sling through multiple sling positioning mechanisms 3 and length difference detection devices 2 in sequence, and clamp and fix the sling using the sling clamping mechanism; Step 2: Using the laser positioning device inside the length difference detection device 2, along with the four vertical lines and five ring marks pre-set on the outer wall of the sling, automatically track and compare the alignment of the laser beam with the intersection of the vertical lines and ring marks. If the beam is not completely aligned with the intersection, it is determined that the sling is twisted as a whole. Step 3: Based on the judgment result of Step 2, control the rotating mechanism to drive the rotating sleeve 4 to drive the sling clamping mechanism and the sling to rotate until the laser is completely aligned with all intersections and the four vertical lines on the sling surface return to the vertical state, thus completing the automatic return of the sling torsion. Step 4: Collect the resistance values of multiple wires of the same length as the steel strands inside the sling using the length difference detection device 2. Calculate the actual length of the corresponding steel strands based on the proportional relationship between resistance and length. Determine the length difference of the steel strands by comparing the resistance differences of the multiple wires and locate the position of the shorter steel strand. Step 5: Based on the test results of Step 4, perform micro-level tensioning on the steel strands that are too short. During the tensioning process, continuously collect the resistance value of the built-in wires and calculate the corresponding steel strand length in real time. When the resistance values of multiple built-in wires are completely consistent, it is determined that the corresponding steel strand lengths are consistent, and tensioning is stopped to complete the automatic adjustment of the steel strand length difference. Step 6: After completing the torsion correction and length difference adjustment, a second verification test is performed. After confirming that the sling is not twisted and the length difference of the steel strands is zero, the sling clamping mechanism is automatically released to complete the test and adjustment operation.
[0027] It should be noted that the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A device for detecting and adjusting the torsion of suspension bridge cables and the difference in the length of steel strands, comprising a frame (1) and a slide rail (5), characterized in that: The slide rail (5) is fixedly installed on the upper surface of the frame (1). A length difference detection device (2) is fixedly installed at one end of the upper surface of the frame (1). Multiple sling positioning mechanisms (3) are slidably installed on the upper side of the slide rail (5) from left to right. A rotating sleeve (4) is rotatably installed in the middle of the sling positioning mechanism (3). A cavity is opened in the middle of the sling positioning mechanism (3). A rotating mechanism that drives the rotating sleeve (4) to rotate is installed inside the cavity. A sling clamping mechanism is installed inside the rotating sleeve (4). A sling body is passed between the multiple sling positioning mechanisms (3) and the length difference detection device (2). Wires of the same length as the sling are installed around the sling body.
2. The suspension bridge cable torsion and strand length difference detection and adjustment device according to claim 1, characterized in that: The rotating mechanism includes a worm gear (12) and a worm (14). The worm gear (12) is disposed inside the cavity and is fixedly sleeved to the outer wall of the rotating sleeve (4). The worm (14) is meshed on one side of the worm gear (12). Both ends of the worm (14) are rotatably connected to the inner wall of the corresponding cavity through bearings. The lower end of the worm (14) is fixedly sleeved with a first bevel gear (13). The lower inner wall of the cavity is located on the worm (14). A side plate (16) is fixedly provided on one side. A transmission rod (15) is rotatably sleeved in the middle of the side plate (16). A second bevel gear (17) is fixedly sleeved at one end of the transmission rod (15) near the worm gear (14). The first bevel gear (13) meshes with the second bevel gear (17). A motor (18) is fixedly provided on the side of the side plate (16) away from the transmission rod (15). The output end of the motor (18) is fixedly connected to one end of the transmission rod (15).
3. The suspension bridge cable torsion and strand length difference detection and adjustment device according to claim 2, characterized in that: The sling clamping mechanism includes rotating bars (9) and clamping blocks (10). A transmission ring (11) is rotatably arranged on the front outer wall of the rotating sleeve (4). Multiple rotating rods (6) are arranged in a circular array around the center of the rotating sleeve (4) on the inner side of the transmission ring (11). The rear ends of the multiple rotating rods (6) are rotatably connected to the front outer wall of the rotating sleeve (4). The multiple rotating bars (9) are fixedly sleeved on the front ends of the corresponding rotating rods (6). The multiple clamping blocks (10) are fixedly arranged... The rotating sleeve (4) is placed at one end of the rotating bar (9) away from the rotating rod (6). The front side of the rotating sleeve (4) is concentrically connected to the drive ring (11). The inner wall of the drive ring (11) is fixedly sleeved with an internal gear ring (8). The front ends of the multiple rotating rods (6) are all fixedly sleeved with gears (7). The internal gear ring (8) meshes with the multiple gears (7). The rotating sleeve (4) has an annular groove inside. The annular groove is provided with a drive mechanism that drives the multiple drive rings (11) to rotate.
4. The suspension bridge cable torsion and strand length difference detection and adjustment device according to claim 3, characterized in that: The driving mechanism includes an electric push rod (24) and an arc-shaped transmission block (19). An arc-shaped opening is provided on the front inner wall of the annular groove, and an arc-shaped groove is provided on the rear inner wall of the annular groove. The arc-shaped transmission block (19) is slidably disposed inside the arc-shaped groove. A connecting rod (20) is fixedly disposed on the front side of the arc-shaped transmission block (19). The front end of the connecting rod (20) passes through the arc-shaped opening and is fixedly connected to the transmission ring (11). The electric push rod (24) is disposed inside the annular groove and located on one side of the arc-shaped groove. A rotating block (23) is fixedly disposed at the tail end of the electric push rod (24). An installation rod (22) is fixedly sleeved inside the rotating block (23). One end of the installation rod (22) is rotatably connected to the inner wall of the annular groove. A connecting ring (21) is fixedly disposed at the piston rod end of the electric push rod (24). The connecting ring (21) is rotatably sleeved with the outer wall of the connecting rod (20).
5. The suspension bridge cable torsion and strand length difference detection and adjustment device according to claim 4, characterized in that: An arc-shaped limiting groove is provided on one side of the inner wall of the arc-shaped groove, and an arc-shaped limiting block (25) is slidably arranged inside the arc-shaped limiting groove. One side of the arc-shaped limiting block (25) is fixedly connected to the arc-shaped transmission block (19).
6. The suspension bridge cable torsion and strand length difference detection and adjustment device according to claim 5, characterized in that: The motor (18) is a geared motor.
7. The suspension bridge cable torsion and strand length difference detection and adjustment device according to claim 6, characterized in that: The outer walls of the multiple clamping blocks (10) are provided with anti-slip textures.
8. The suspension bridge cable torsion and strand length difference detection and adjustment device according to claim 7, characterized in that: The length difference detection device (2) is equipped with a laser positioning device inside. The outer wall of the sling is provided with four vertical lines arranged in a circular array with the center of the sling as the axis. The outer wall of the sling is provided with five circular marks from top to bottom.
9. A method for detecting and adjusting the torsion of suspension bridge cables and the difference in the length of steel strands, using the device for detecting and adjusting the torsion of suspension bridge cables and the difference in the length of steel strands as described in claim 8, characterized in that... Includes the following steps: Step 1: Pass the sling through multiple sling positioning mechanisms (3) and length difference detection devices (2) in sequence, and clamp and fix the sling through the sling clamping mechanism; Step 2: Using the laser positioning device inside the length difference detection device (2), in conjunction with the four vertical line marks and five ring marks pre-set on the outer wall of the sling, automatically track and compare the alignment of the laser beam with the intersection of the vertical line marks and the ring marks. If the beam is not completely aligned with the intersection, it is determined that the sling has an overall twist. Step 3: Based on the judgment result of Step 2, control the rotating mechanism to drive the rotating sleeve (4) to drive the sling clamping mechanism and the sling to rotate until the laser is completely aligned with all intersections and the four vertical lines on the sling surface return to the vertical state, thus completing the automatic return of the sling torsion. Step 4: Collect the resistance values of multiple wires of the same length as the steel strands inside the sling by using the length difference detection device (2). Calculate the actual length of the corresponding steel strands based on the proportional relationship between resistance and length. Determine the length difference of the steel strands by comparing the resistance differences of the multiple wires and locate the position of the shorter steel strands. Step 5: Based on the test results of Step 4, perform micro-level tensioning on the steel strands that are too short. During the tensioning process, continuously collect the resistance value of the built-in wires and calculate the corresponding steel strand length in real time. When the resistance values of multiple built-in wires are completely consistent, it is determined that the corresponding steel strand lengths are consistent, and tensioning is stopped to complete the automatic adjustment of the steel strand length difference. Step 6: After completing the torsion correction and length difference adjustment, a second verification test is performed. After confirming that the sling is not twisted and the length difference of the steel strands is zero, the sling clamping mechanism is automatically released to complete the test and adjustment operation.