Suspender bridge cable saddle rolling friction force measuring structure and measuring method

Abstract

This invention relates to the field of cable saddle rolling friction measurement technology, and discloses a structure and method for measuring the rolling friction of suspension bridge cable saddles. The rolling friction measurement structure includes a base plate, a frame fixedly mounted on the upper surface of the base plate, multiple sets of rollers installed inside the frame, and buffer value display mechanisms mounted on both the left and right sides of the upper surface of the base plate. This invention utilizes a trigger-activated buffer assembly, in which an L-shaped slider is slidably mounted in a guide groove of a fixed plate. One end of a spring is fixedly mounted to the left side of the L-shaped slider, and the other end is fixedly mounted to the right side of a connecting block. When the output rod of the jack extends and pushes the connecting block to the right, the relative distance between the connecting block and the L-shaped slider shortens, and the spring is gradually compressed, converting the rigid thrust of the jack into an elastic buffer force, absorbing the stick-slip impact energy caused by the difference in static and dynamic friction coefficients.

Description

Technical Field

[0001] This invention relates to the field of cable saddle rolling friction measurement technology, specifically to a structure and method for measuring the rolling friction of suspension bridge cable saddles. Background Technology

[0002] In the construction of suspension bridges, after the cable saddle support system adopts a roller structure, the sliding friction between it and the tower top is transformed into rolling friction. In order to accurately control the jacking force amplitude in the active jacking process, it is necessary to accurately measure the rolling friction coefficient. The accurate measurement of the rolling friction force of the suspension bridge cable saddle has become a core technical link in the control of the active jacking process and the assurance of the cable saddle positioning accuracy.

[0003] In existing technologies, high-precision force and displacement sensors are typically installed at the top of the tower to simultaneously collect data on the jacking force and cable saddle displacement response during active jacking. The actual rolling friction coefficient is then calculated in reverse using a structural mechanics model. This coefficient is affected by multiple factors, such as the machining accuracy of the rollers, the characteristics of the contact surface materials, the lubrication status, and the load level. Therefore, multiple on-site calibration tests are required under different construction stages and different load conditions to establish a reliable basis for determining the friction coefficient value.

[0004] However, during operation, when the jacking jack slowly increases pressure, the cable saddle remains stationary. As the pressure continues to rise to a certain threshold, the cable saddle will suddenly jut out a few millimeters, and the pressure will drop instantly. This is not a one-time occurrence, but a recurring stick-slip phenomenon, which will cause the measured jacking force data to be distorted, unable to accurately reflect the true rolling friction coefficient, and will affect the main cable alignment and the structural safety of the tower.

[0005] Although the above problems can be solved by using a spring preload assembly, the operator cannot receive prompts to accurately read the compression at the moment of startup. This results in the dispersion of measurement data, making it impossible to establish a stable basis for the rolling friction coefficient and to understand the specific numerical issues while receiving prompts. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a structure and method for measuring the rolling friction force of suspension bridge cable saddles. This method has the advantages of preventing sudden movement of the cable saddle and ensuring data accuracy, thus solving the problems mentioned in the background art.

[0007] The present invention provides the following technical solution: a structure for measuring the rolling friction force of a suspension bridge cable saddle, comprising a base plate, a frame fixedly installed on the upper surface of the base plate, multiple sets of rollers installed inside the frame, and buffer value display mechanisms installed on both the left and right sides of the upper surface of the base plate. The power input end of the buffer numerical display mechanism is equipped with a start-trigger buffer component that converts the pushing force into a buffering force, and the power output end of the start-trigger buffer component is equipped with a trigger indicator component that converts the translational force into a meshing force. The start-up trigger buffer assembly includes a fixed plate, a spring component, a telescopic rod, a connecting block, a placement block, and an L-shaped slider; The trigger indicator assembly includes an extension frame, a rack, a gear, a rotating shaft, a trigger bar, a rectangular base, a mechanical trigger bell, and a rectangular frame. The buffer value display mechanism consists of a trigger buffer component and a trigger indicator component.

[0008] Preferably, the bottom of the fixing plate is fixedly installed on the upper surface of the base plate, the inside of the fixing plate is provided with a guide groove, the lower surface of the L-shaped slider is slidably connected to the inner wall of the guide groove, one end of the spring is fixedly installed on the left side of the L-shaped slider, one end of the telescopic rod is fixedly installed on the left side of the L-shaped slider, the right side of the connecting block is fixedly installed on the other end of the spring and the telescopic rod, and the inside of the placement block is abutted against the outer surface of the connecting block.

[0009] Preferably, the bottom of the rectangular frame is fixedly installed to the upper surface of the base plate, the outer surface of the first rotating shaft is rotatably installed to the inner wall of the rectangular frame, the outer surface of the first gear is fixedly installed to the outer surface of one end of the first rotating shaft, the lower surface of the first rack meshes with the outer surface of the first gear, the front of the extension frame is fixedly installed to the back of the first rack, the lower surface of the rectangular seat is fixedly installed to the upper surface of the base plate, the lower surface of the mechanical trigger bell is fixedly installed to the upper surface of the rectangular seat, and the inside of the trigger bar is fixedly installed to the outer surface of the first gear.

[0010] Preferably, the trigger bar contacts a mechanical trigger bell when it rotates, providing an audible alert.

[0011] Preferably, a pulley is fixedly mounted on the outer surface of one end of the rotating shaft, and a transmission belt is driven onto the outer surface of the pulley.

[0012] Preferably, the inner ring of the transmission belt is equipped with a second pulley, and a second rotating shaft is fixedly installed inside the second pulley. The outer surface of one end of the second rotating shaft rotates with the inner wall of the frame.

[0013] Preferably, a gear two is fixedly mounted on the outer surface of the rotating shaft two, and a rack two meshes with the outer surface of the gear two.

[0014] Preferably, a limiting block is fixedly installed on the upper surface of the base plate, the interior of the limiting block is slidably connected to the outer surface of the rack, and a scale mark is provided on the upper surface of the base plate.

[0015] Preferably, a saddle is rolled on the upper surface of the roller, the right side of the saddle is fixedly installed on the left side of the placement block, a fixing block is fixedly installed on the upper surface of the base plate, a jacking jack is installed on the upper surface of the fixing block, an output rod is installed at the output end of the jacking jack, and one end of the output rod is fixedly installed on the right side of the L-shaped slider.

[0016] A method for measuring rolling friction force of suspension bridge cable saddles, using a structure for measuring rolling friction force of suspension bridge cable saddles as described above, includes the following specific steps: S1. Fix the base plate to the top of the suspension bridge tower so that the multiple sets of rollers inside the frame can stably support the cable saddle; install the jacking jack on the upper surface of the base plate through the fixing block, and fix one end of the output rod to the right side of the connecting block; ensure that the spring and the telescopic rod are in the initial unloaded state, the trigger bar and the mechanical trigger bell are separated, and the front end of the rack points to the zero point of the scale. S2. Start the jacking mechanism to slowly extend the output rod and push the connecting block to the right. Since the L-shaped slider is slidably installed in the guide groove and its left side is fixedly connected to the spring and one end of the telescopic rod, when the connecting block moves to the right, the relative distance between the connecting block and the L-shaped slider shortens and the spring is gradually compressed. S3. When the compression of the spring gradually increases to a level sufficient to overcome the maximum static friction between the saddle and the roller, the saddle begins to slowly roll to the right, and drives the placement block fixedly installed on its right side to move to the right in sync. The placement block drives the rack to move to the right through the extension frame. The rack meshes with the gear, causing the rotating shaft to rotate within the rectangular frame, which in turn drives the trigger bar fixedly installed on the outer surface of the gear to deflect synchronously. During the rotation, the trigger bar contacts and collides with the mechanical trigger bell fixedly installed on the upper surface of the rectangular seat. S4. When the rotating shaft rotates, it drives the pulley fixedly mounted on its outer surface to rotate. The pulley drives the second pulley to rotate synchronously through the transmission belt. The second pulley drives the rotating shaft fixedly mounted inside to rotate. The rotating shaft drives the gear fixedly mounted on its outer surface to rotate. The gear meshes with the rack, driving the rack to move linearly to the right under the guidance of the limit block. The operator can obtain the precise compression of the spring at the moment of start-up by reading the scale value on the upper surface of the base plate pointed to by the front end of the rack. According to Hooke's law, the rolling friction between the saddle and the roller is calculated.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This structure for measuring the rolling friction of suspension bridge cable saddles utilizes a trigger buffer assembly. An L-shaped slider is slidably mounted in a guide groove on a fixed plate. One end of a spring is fixedly mounted to the left side of the L-shaped slider, and the other end is fixedly mounted to the right side of a connecting block. When the output rod of the jack extends and pushes the connecting block to the right, the relative distance between the connecting block and the L-shaped slider shortens, and the spring is gradually compressed. This converts the rigid thrust of the jack into an elastic buffer force, absorbing the stick-slip impact energy caused by the difference in static and dynamic friction coefficients. This prevents the cable saddle from suddenly jutting out several millimeters, thus protecting the main cable alignment and the structural safety of the tower. Simultaneously, the extension frame in the trigger indicator assembly moves with the cable saddle, driving a rack and pinion to mesh, causing the trigger bar to contact and collide with the mechanical trigger bell on the upper surface of the rectangular seat. A crisp sound is emitted the instant the cable saddle begins to roll, solving the problem of the operator being unable to accurately obtain the starting timing. This ensures the uniqueness and repeatability of the spring compression reading, significantly reducing the dispersion of the measurement data.

[0018] 2. This structure for measuring the rolling friction force of suspension bridge cable saddles transmits the rotational motion of rotating shaft one to rotating shaft two through the transmission cooperation of pulley one, transmission belt, and pulley two. This drives gear two to mesh with rack two, causing rack two to slide under the guidance of a limiting block. Its end precisely points to the scale mark on the upper surface of the base plate, allowing the operator to read the accurate compression of the spring component simultaneously with the mechanical trigger bell's audible prompt, without relying on experience or secondary observation. In multiple measurements, this structure can be repeatedly reset while maintaining consistent trigger sensitivity and reading accuracy, providing a reliable purely mechanical measurement method for establishing a stable basis for the rolling friction coefficient. This meets the engineering requirements for accurate measurement of rolling friction force in the active jacking process during suspension bridge construction. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention; Figure 2 For the present invention Figure 1 A top-view structural diagram; Figure 3 For the present invention Figure 1 A schematic diagram of the side view structure; Figure 4 For the present invention Figure 1 A schematic diagram of the cross-sectional structure; Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point A; Figure 6 For the present invention Figure 4 Enlarged schematic diagram of the structure at point B.

[0020] In the diagram: 1. Base plate; 2. Frame; 3. Roller; 4. Cable saddle; 5. Fixing block; 6. Push jack; 7. Output rod; 8. Start trigger buffer assembly; 801. Fixing plate; 802. Guide groove; 803. Spring component; 804. Telescopic rod; 805. Connecting block; 806. Placement block; 807. L-shaped slider; 9. Trigger indicator assembly; 901. Extension frame; 902. Rack one; 903. Gear one; 904. Rotating shaft one; 905. Trigger bar; 906. Rectangular seat; 907. Mechanical trigger bell; 908. Pulley one; 909. Transmission belt; 910. Pulley two; 911. Rotating shaft two; 912. Gear two; 913. Rack two; 914. Limit block; 915. Rectangular frame; 916. Scale mark. Detailed Implementation

[0021] 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.

[0022] Please see Figure 1 , Figure 4 and Figure 5 A structure for measuring the rolling friction of cable saddles in suspension bridges includes a base plate 1, a frame 2 fixedly mounted on the upper surface of the base plate 1, multiple sets of rollers 3 installed inside the frame 2, and buffer value display mechanisms installed on both the left and right sides of the upper surface of the base plate 1. The power input end of the buffer value display mechanism is equipped with a start-trigger buffer assembly 8 that converts the pushing force into a buffering force, and the power output end of the start-trigger buffer assembly 8 is equipped with a trigger indicator assembly 9 that converts the translational force into a meshing force. The start-up trigger buffer assembly 8 includes a fixed plate 801, a spring 803, a telescopic rod 804, a connecting block 805, a placement block 806, and an L-shaped slider 807; The trigger indicator assembly 9 includes an extension frame 901, a rack 902, a gear 903, a rotating shaft 904, a trigger bar 905, a rectangular base 906, a mechanical trigger bell 907, and a rectangular frame 915; The buffer value display mechanism is composed of a trigger buffer assembly 8 and a trigger indicator assembly 9. The bottom of the fixed plate 801 is fixedly installed on the upper surface of the base plate 1. A guide groove 802 is provided inside the fixed plate 801. The lower surface of the L-shaped slider 807 is slidably connected to the inner wall of the guide groove 802. One end of the spring 803 is fixedly installed on the left side of the L-shaped slider 807. One end of the telescopic rod 804 is fixedly installed on the left side of the L-shaped slider 807. The right side of the connecting block 805 is fixedly installed on the other end of the spring 803 and the telescopic rod 804. The inside of the placement block 806 abuts against the outer surface of the connecting block 805.

[0023] Specifically, the base plate 1 is a rectangular flat plate structure, extending along the direction of the cable saddle movement in the length direction and perpendicular to the direction of movement in the width direction. The frame 2 is a rectangular frame composed of longitudinal beams on the left and right sides and transverse beams on the front and rear sides, welded or bolted together. It is hollow inside to accommodate the rollers 3. The frame 2 is centrally located on the upper surface of the base plate 1, with space left on its left and right sides and the edges of the base plate 1 for mounting the fixing plate 801. The inner bottom surface is coplanar with the upper surface of the base plate 1. The frame 2 is fixedly connected to the base plate 1 by welding or high-strength bolts. Multiple sets of rollers 3 are arranged at equal intervals along the length of the frame 2, with a spacing of 1.2 to 1.5 times the roller diameter. The axis is perpendicular to the direction of the cable saddle movement. The bottom of the fixing plate 801 is fixedly installed on the upper surface of the base plate 1. The fixing plate 801 has a guide groove 802 inside. The guide groove 802 is rectangular or T-shaped, with a width matching the L-shaped slider 807 and a length greater than the maximum compression stroke of the spring 803. The lower surface of the L-shaped slider 807 is slidably connected to the inner wall of the guide groove 802. One end of the spring 803 is fixedly installed on the left side of the L-shaped slider 807, and the other end is fixedly installed on the right side of the connecting block 805. When the jacking jack 6 pushes the connecting block 805 to the right, the L-shaped slider 807 slides in the guide groove 802, the relative distance between the connecting block 805 and the L-shaped slider 807 shortens, and the spring 803 is gradually compressed, converting the rigid thrust of the jacking jack 6 into an elastic buffer force. This effectively absorbs the stick-slip impact energy caused by the difference in static and dynamic friction coefficients, avoiding the phenomenon of the cable saddle 4 suddenly jutting out several millimeters, thus protecting the main cable alignment and the safety of the tower under stress. The telescopic rod 804 is a multi-section sleeve-type guide rod, arranged parallel to the spring 803, and its length is telescopic. It plays an auxiliary guiding and limiting role, ensuring that the connecting block 805 and the L-shaped slider 807 make stable linear movements in the guide groove 802, improving the stability and safety of the measurement process. The connecting block 805 is a rectangular or U-shaped block, fixedly connected to one end of the spring 803 and the telescopic rod 804 on its right side, and abutting against the placement block 806 on its left side. The placement block 806 is a rectangular block, fixed to the cable saddle 4 on its left side, and has a groove on its right side to engage with the connecting block 805. The extension frame 901 is an L-shaped or straight rod-shaped bracket, horizontally arranged, with its left end fixed to the right side of the placement block 806 and its right end fixed to the rack 902. The rack 902 is a straight rack, horizontally placed with its teeth facing down. The gear 903 is a cylindrical gear that meshes with the rack 902 and is fixed to one end of the rotating shaft 904 by a key or welding. The rotating shaft 904 is a cylindrical shaft, with both ends mounted on the rectangular frame 915 by bearings, and is horizontally arranged. The trigger bar 905 is a slender rod or plate-like structure, with one end fixed to the outer side of the gear 903 and the other end pointing towards the mechanical trigger bell 907. The rectangular base 906 is a rectangular boss that is fixed to the upper surface of the base plate 1.Through the meshing transmission structure of rack-902 and gear-903 in the trigger indicator component 9, the translational force is efficiently converted into meshing force. The rack-902 moves linearly under the push of the connecting block 805, driving gear-903 to rotate around the rotating shaft-904. The rotational motion is then transmitted to the mechanical trigger bell 907 through the trigger bar 905, realizing a complete force transmission link from the thrust input to the sound of the trigger bell. The transmission process is precise and reliable, and it is not easy to produce slippage error, ensuring consistent sensitivity for each trigger.

[0024] Please see Figure 1 , Figure 4 and Figure 6The bottom of the rectangular frame 915 is fixedly installed on the upper surface of the base plate 1. The rectangular frame 915 is a U-shaped or rectangular bracket, fixed on the base plate 1, and is used to support the rotating shaft 904. The outer surface of the rotating shaft 904 is rotatably installed on the inner wall of the rectangular frame 915. The outer surface of the gear 903 is fixedly installed on the outer surface of one end of the rotating shaft 904. The lower surface of the rack 902 meshes with the outer surface of the gear 903. The front of the extension frame 901 is fixedly installed on the back of the rack 902. The lower surface of the rectangular seat 906 is fixedly installed on the upper surface of the base plate 1. The lower surface of the mechanical trigger bell 907 is fixedly installed on the upper surface of the rectangular seat 906. The inside of the trigger bar 905 is fixedly installed on the outer surface of the gear 903. The trigger bar 905 rotates... When in contact with the mechanical trigger bell 907, an audible prompt is made. A pulley 908 is fixedly mounted on the outer surface of one end of the rotating shaft 904. A transmission belt 909 is driven to the outer surface of the pulley 908. A pulley 910 is driven to the inner ring of the transmission belt 909. A rotating shaft 911 is fixedly mounted inside the pulley 910. One end of the outer surface of the rotating shaft 911 rotates with the inner wall of the frame 2. A gear 912 is fixedly mounted on the outer surface of the rotating shaft 911. A rack 913 meshes with the outer surface of the gear 912. A limit block 914 is fixedly mounted on the upper surface of the base plate 1. The interior of the limit block 914 is slidably connected to the outer surface of the rack 913. A scale mark 916 is opened on the upper surface of the base plate 1. Belt pulley 908 and belt pulley 910 are V-type or synchronous pulleys. Belt pulley 908 is fixed to the other end of rotating shaft 904, and belt pulley 910 is fixed to one end of rotating shaft 911. The two are connected by a transmission belt 909. The transmission belt 909 is a rubber synchronous belt or V-belt, tensioned between the pulleys. Rotating shaft 911 is a cylindrical shaft, supported at both ends by frame 2 or additional brackets. Gear 912 is a cylindrical gear, fixed to the middle of rotating shaft 911 by a key connection. Rack 913 is a straight rack, horizontally arranged, meshing with gear 912. Limiting block 914 is a rectangular block with guide holes or grooves, fixed to the base plate 1. Rack 913 passes through limiting block 914 and slides with it. Scale mark 916 is a scale etched or printed on the upper surface of the base plate 1, with an accuracy of 0.1mm, located below or to the side of the front end of rack 913.

[0025] Specifically, by setting up a contact engagement structure between the trigger bar 905 and the mechanical trigger bell 907, when gear 1 903 rotates via rotating shaft 1 904, the trigger bar 905, fixedly installed on the outer surface of gear 1 903, rotates accordingly and periodically contacts and collides with the mechanical trigger bell 907, thereby producing a clear audible prompt. This achieves instant auditory feedback when the friction force reaches a preset threshold, allowing operators to quickly perceive the measurement status in noisy environments without relying on electronic display equipment, thus improving the convenience and reliability of outdoor field operations. Through a belt drive mechanism consisting of pulley 1 908, transmission belt 909, and pulley 2 910, the rotational motion of rotating shaft 1 904 is transmitted over a long distance to rotating shaft 2 911. Transmission belt 909 has good elastic buffering and overload protection functions. When the instantaneous impact force is too large, transmission belt 909 will produce a slight elastic slippage, effectively absorbing the peak impact and protecting the rear gear 2 912 and rack 2 913 from hard damage. At the same time, the belt drive structure is easy to install, low in cost, and convenient for later maintenance and replacement.

[0026] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 A saddle 4 is mounted on the upper surface of the roller 3. The right side of the saddle 4 is fixedly mounted to the left side of the placement block 806. A fixing block 5 is fixedly mounted on the upper surface of the base plate 1. A jacking jack 6 is mounted on the upper surface of the fixing block 5. An output rod 7 is mounted on the output end of the jacking jack 6. One end of the output rod 7 is fixedly mounted to the right side of the L-shaped slider 807.

[0027] Specifically, the bottom of the cable saddle 4 is a flat or arc-shaped contact surface, the width of which matches the length of the roller 3. It is placed on the upper surface of the roller 3, and its right side is fixedly connected to the left side of the placement block 806 by bolts or welding. The roller 3 and the frame 2 have a rolling fit and no fixed connection. By setting the rolling fit structure between the roller 3 and the cable saddle 4, the upper surface of the cable saddle 4 rolls smoothly on the roller 3, realistically simulating the actual rolling friction condition of the suspension bridge cable saddle. This makes the measurement data closer to the real working state, avoids the measurement deviation caused by the fixed sliding friction method, and effectively improves the accuracy and engineering reference value of rolling friction measurement. The jacking jack 6 is a hydraulic jack, which is installed on the right side of the upper surface of the base plate 1 by the fixing block 5. The output rod 7 is a cylindrical push rod with a flat or spherical contact head at the front end and the axis pointing horizontally to the left. The fixing block 5 is welded or bolted to the base plate 1, and the jacking jack 6 is fixed to the fixing block 5 by flanges or clamps. The left end of the output rod 7 is connected to the right side of the L-shaped slider 807 by a threaded connection or a ball joint. Through the hydraulic drive of the jack 6, the operator can precisely adjust the magnitude of the thrust applied to the cable saddle 4, realizing the gradual loading from zero load to the preset load. Combined with the buffer absorption function of the start-up trigger buffer component 8, the rolling process of the cable saddle 4 on the roller 3 is always in a stable and controlled state, effectively avoiding the measurement change caused by the instantaneous excessive thrust, and improving the accuracy of friction measurement and the stability of data acquisition.

[0028] A method for measuring rolling friction force of cable saddles in suspension bridges includes the following specific steps: S1. Fix the base plate 1 to the top of the suspension bridge tower, so that the multiple sets of rollers 3 inside the frame 2 can stably support the cable saddle 4; install the jacking jack 6 on the upper surface of the base plate 1 through the fixing block 5, and fix one end of the output rod 7 to the right side of the connecting block 805; ensure that the spring 803 and the telescopic rod 804 are in the initial unloaded state, the trigger bar 905 and the mechanical trigger bell 907 are kept separate, and the front end of the rack 2 913 points to the zero point of the scale mark 916; S2. Start the jack 6 to slowly extend the output rod 7 and push the connecting block 805 to the right. Since the L-shaped slider 807 is slidably installed in the guide groove 802 and its left side is fixedly connected to the spring 803 and one end of the telescopic rod 804, when the connecting block 805 moves to the right, the relative distance between the connecting block 805 and the L-shaped slider 807 is shortened, and the spring 803 is gradually compressed. S3. When the compression of the spring 803 gradually increases to a level sufficient to overcome the maximum static friction between the saddle 4 and the roller 3, the saddle 4 begins to slowly roll to the right, causing the placement block 806 fixedly mounted to its right to move to the right in sync. The placement block 806 drives the rack 902 to move to the right through the extension frame 901. The rack 902 meshes with the gear 903, causing the rotating shaft 904 to rotate within the rectangular frame 915, which in turn causes the trigger bar 905 fixedly mounted on the outer surface of the gear 903 to deflect synchronously. During the rotation, the trigger bar 905 contacts and collides with the mechanical trigger bell 907 fixedly mounted on the upper surface of the rectangular seat 906. S4. When the rotating shaft 904 rotates, it drives the pulley 908 fixedly mounted on its outer surface to rotate. The pulley 908 drives the pulley 910 to rotate synchronously through the transmission belt 909. The pulley 910 drives the rotating shaft 911 fixedly mounted inside to rotate. The rotating shaft 911 drives the gear 912 fixedly mounted on its outer surface to rotate. The gear 912 meshes with the rack 913, driving the rack 913 to move linearly to the right under the guidance of the limit block 914. The operator can obtain the precise compression of the spring 803 at the moment of start-up by reading the value of the scale mark 916 on the upper surface of the base plate 1 pointed to by the front end of the rack 913. According to Hooke's law, the rolling friction between the saddle 4 and the roller 3 is calculated.

[0029] Working principle: During use, the base plate 1 is fixedly installed on the top of the suspension bridge tower, so that multiple sets of rollers 3 inside the frame 2 can stably support the cable saddle 4; the jacking jack 6 is installed on the upper surface of the base plate 1 through the fixing block 5, and one end of the output rod 7 is fixedly connected to the right side of the connecting block 805; at this time, the L-shaped slider 807 is slidably installed in the guide groove 802 of the fixing plate 801, one end of the spring 803 and the telescopic rod 804 are fixedly installed on the left side of the L-shaped slider 807, and the other end is fixedly installed on the right side of the connecting block 805. The spring 803 is in an initial free state, neither stretched nor compressed; the trigger bar 905 is separated from the mechanical trigger bell 907 on the upper surface of the rectangular seat 906, and the rack 2 913 is at the limit block 9. Guided by jack 14, its front end points to the zero point of the scale mark 916 on the upper surface of the base plate 1. The jack 6 is activated, causing the output rod 7 to slowly extend and push the connecting block 805 to the right. Since the L-shaped slider 807 is slidably installed in the guide groove 802 and its left side is fixedly connected to the spring 803 and one end of the telescopic rod 804, when the connecting block 805 moves to the right, the relative distance between the connecting block 805 and the L-shaped slider 807 shortens. The spring 803 is gradually compressed, gradually accumulating elastic potential energy in the guide groove 802 of the fixed plate 801. This converts the rigid thrust of the jack 6 into an elastic buffer force, effectively suppressing the stick-slip impact caused by the difference in static and dynamic friction coefficients between the saddle 4 and the roller 3. When the compression of the spring 803 gradually increases to a level sufficient to overcome the maximum static friction between the saddle 4 and the roller 3, the saddle 4 begins to slowly roll to the right, causing the placement block 806, which is fixedly mounted to its right, to move to the right in sync. The placement block 806 drives the rack 902 to move to the right via the extension frame 901. The rack 902 meshes with the gear 903, causing the rotating shaft 904 to rotate within the rectangular frame 915, which in turn causes the trigger bar 905, which is fixedly mounted on the outer surface of the gear 903, to deflect synchronously. During rotation, the trigger bar 905 contacts and collides with the mechanical trigger bell 907, which is fixedly mounted on the upper surface of the rectangular seat 906, emitting a crisp sound to inform the operator that the saddle 4 has begun to roll. To accurately read the compression amount of spring 803, when the rotating shaft 904 rotates, it drives the pulley 908 fixedly mounted on its outer surface to rotate. The pulley 908 drives the pulley 910 to rotate synchronously through the transmission belt 909. The pulley 910 drives the rotating shaft 911 fixedly mounted inside to rotate. The rotating shaft 911 drives the gear 912 fixedly mounted on its outer surface to rotate. The gear 912 meshes with the rack 913, driving the rack 913 to move linearly to the right under the guidance of the limit block 914. The operator can obtain the accurate compression amount of spring 803 at the moment of start-up by reading the value of the scale mark 916 on the upper surface of the base plate 1 pointed to by the front end of the rack 913.According to Hooke's Law, the rolling friction force between the saddle 4 and the roller 3 can be calculated by multiplying the compression by the known stiffness coefficient of the spring 803. After a single measurement, the jack 6 is depressurized and retracted. The compressed spring 803 stretches due to its elastic restoring force, pushing the connecting block 805 and the L-shaped slider 807 to the left. The connecting block 805 drives the placement block 806 and the saddle 4 to return to their left positions. At the same time, the rack 902 moves to the left, causing the gear 903 to rotate in the opposite direction, and the trigger bar 905 disengages from the mechanical trigger bell 907. The operator manually pushes the rack 913 back to the zero position to perform the next repeated measurement, thus establishing a stable basis for the rolling friction coefficient through multiple measurements.

[0030] The jacking jack 6 can be a large-tonnage hydraulic jack that meets the requirements of tower top construction, such as the RCH-306 or CLRG-506 model. Its output rod 7 is directly fixed to the right side of the connecting block 805 to provide initial rigid pushing force. The mechanical trigger bell 907 uses a purely physical structure that does not require electrical power, such as a combination of a small copper bell and an elastic trigger bar. Its lower surface is fixedly installed on the upper surface of the rectangular base 906, and it emits a crisp sound based on the physical collision of the trigger bar 905 when it rotates. The base plate 1 and frame 2 should be made of high-strength low-alloy steel to adapt to the complex stress at the tower top and resist the decrease in impact toughness under low-temperature conditions. Multiple sets of rollers 3 are recommended to be made of bearing steel. The entire component undergoes quenching treatment to reduce rolling friction and prevent crushing of the contact surface. Spring component 803 and telescopic rod 804 should be made of high-quality spring steel and undergo rigorous high-pressure treatment and fatigue testing to ensure stable stiffness coefficients during repeated compression and rebound, preventing plastic deformation or creep. Load-bearing components such as fixed plate 801, guide groove 802, and connecting block 805 should be made of 45 steel and heat-treated to improve overall mechanical properties. Transmission components such as rack 902, gear 903, rack 913, gear 912, rotating shaft 904, and rotating shaft 911 should be made of 40Cr or 20CrMnTi and undergo carburizing and quenching to ensure wear resistance and meshing accuracy of the tooth surfaces.

[0031] During use, the pressurization rate of the jack 6 must be strictly controlled within a slow range to avoid impact compression of the spring 803, which could affect the accuracy of the starting critical point. Before each measurement, the initial gap between the mechanical trigger bell 907 and the trigger bar 905 should be confirmed to ensure there is no rust or foreign object jamming, and to prevent wind-induced shaking from causing non-measuring engagement between rack 902 and gear 903. The cumulative number of compressions of the spring 803 in the starting trigger buffer assembly 8 should be recorded manually or tracked by the built-in mechanical counter. When the allowable fatigue life specified by the factory is exceeded, it must be replaced in time to maintain the accuracy of the stiffness coefficient. The scale 916 and the front end of rack 913 should be kept clean and wiped with a soft cloth before each reading to prevent dust accumulation from causing reading deviations. After measurement, the jack 6 should be completely depressurized to allow the spring 803 to return to its free state, preventing creep caused by prolonged pressure. At the same time, the saddle 4 should be fixed to the base plate 1 using a temporary locking device to prevent accidental slippage. If a significant meshing gap is found between rack 902 and gear 903 during measurement, or if the mechanical trigger bell 907 produces a dull or intermittent sound, the machine should be stopped immediately to check the tension of the corresponding transmission belt 909 and the wear condition of the gears and racks. The overall accuracy of the measuring structure should be checked periodically on an indoor calibration platform. Standard weights should be used to compare the spring 803 with known stiffness to ensure that the correspondence between rack 913 and scale 916 is consistent with the actual compression. If the deviation exceeds ±2%, the scale should be recalibrated or worn parts should be replaced.

[0032] It should be noted that the scope of protection of this invention does not involve improvements to the internal structure and methods; furthermore, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are 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.

[0033] 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 structure for measuring rolling friction force of suspension bridge cable saddles, characterized in that: Includes a base plate (1), on the upper surface of the base plate (1) a frame (2) is fixedly installed, and multiple sets of rollers (3) are installed inside the frame (2). Buffer numerical display mechanisms are installed on both the left and right sides of the upper surface of the base plate (1). The power input end of the buffer numerical display mechanism is equipped with a start-trigger buffer assembly (8) that converts the pushing force into a buffering force, and the power output end of the start-trigger buffer assembly (8) is equipped with a trigger indicator assembly (9) that converts the translational force into a meshing force. The start-up trigger buffer assembly (8) includes a fixed plate (801), a spring (803), a telescopic rod (804), a connecting block (805), a placement block (806), and an L-shaped slider (807). The trigger indicator assembly (9) includes an extension frame (901), a rack (902), a gear (903), a rotating shaft (904), a trigger bar (905), a rectangular base (906), a mechanical trigger bell (907), and a rectangular frame (915). The buffer value display mechanism consists of a trigger buffer component (8) and a trigger indicator component (9).

2. The structure for measuring rolling friction force of suspension bridge cable saddles according to claim 1, characterized in that: The bottom of the fixing plate (801) is fixedly installed on the upper surface of the base plate (1). The fixing plate (801) has a guide groove (802) inside. The lower surface of the L-shaped slider (807) is slidably connected to the inner wall of the guide groove (802). One end of the spring (803) is fixedly installed on the left side of the L-shaped slider (807). One end of the telescopic rod (804) is fixedly installed on the left side of the L-shaped slider (807). The right side of the connecting block (805) is fixedly installed on the other end of the spring (803) and the telescopic rod (804). The interior of the placement block (806) abuts against the outer surface of the connecting block (805).

3. The structure for measuring rolling friction force of suspension bridge cable saddles according to claim 2, characterized in that: The bottom of the rectangular frame (915) is fixedly installed on the upper surface of the base plate (1), the outer surface of the rotating shaft (904) is rotatably installed on the inner wall of the rectangular frame (915), the outer surface of the gear (903) is fixedly installed on the outer surface of one end of the rotating shaft (904), the lower surface of the rack (902) meshes with the outer surface of the gear (903), the front of the extension frame (901) is fixedly installed on the back of the rack (902), the lower surface of the rectangular seat (906) is fixedly installed on the upper surface of the base plate (1), the lower surface of the mechanical trigger bell (907) is fixedly installed on the upper surface of the rectangular seat (906), and the interior of the trigger bar (905) is fixedly installed on the outer surface of the gear (903).

4. The structure for measuring rolling friction force of suspension bridge cable saddles according to claim 3, characterized in that: When the trigger bar (905) rotates, it comes into contact with the mechanical trigger bell (907) to provide an audible prompt.

5. A structure for measuring rolling friction force of suspension bridge cable saddles according to claim 4, characterized in that: A pulley (908) is fixedly mounted on the outer surface of one end of the rotating shaft (904), and a transmission belt (909) is driven on the outer surface of the pulley (908).

6. A structure for measuring rolling friction force of suspension bridge cable saddles according to claim 5, characterized in that: The inner ring of the transmission belt (909) is equipped with a pulley two (910), and a rotating shaft two (911) is fixedly installed inside the pulley two (910). The outer surface of one end of the rotating shaft two (911) rotates with the inner wall of the frame (2).

7. A structure for measuring rolling friction force of suspension bridge cable saddles according to claim 6, characterized in that: Gear 2 (912) is fixedly installed on the outer surface of the rotating shaft 2 (911), and rack 2 (913) meshes with the outer surface of gear 2 (912).

8. A structure for measuring rolling friction force of suspension bridge cable saddles according to claim 7, characterized in that: A limiting block (914) is fixedly installed on the upper surface of the base plate (1). The interior of the limiting block (914) is slidably connected to the outer surface of the rack (913). A scale mark (916) is opened on the upper surface of the base plate (1).

9. A structure for measuring rolling friction force of suspension bridge cable saddles according to claim 8, characterized in that: A saddle (4) is rolled on the upper surface of the roller (3). The right side of the saddle (4) is fixedly installed on the left side of the placement block (806). A fixing block (5) is fixedly installed on the upper surface of the base plate (1). A jacking jack (6) is installed on the upper surface of the fixing block (5). An output rod (7) is installed at the output end of the jacking jack (6). One end of the output rod (7) is fixedly installed on the right side of the L-shaped slider (807).

10. A method for measuring rolling friction force of a suspension bridge cable saddle, using the structure for measuring rolling friction force of a suspension bridge cable saddle as described in claim 9, characterized in that, The specific steps include the following: S1. Fix the base plate (1) to the top of the suspension bridge tower so that the multiple sets of rollers (3) inside the frame (2) can stably support the cable saddle (4); install the jack (6) on the upper surface of the base plate (1) through the fixing block (5), and fix one end of the output rod (7) to the right side of the connecting block (805); ensure that the spring (803) and the telescopic rod (804) are in the initial unstressed state, the trigger bar (905) and the mechanical trigger bell (907) are separated, and the front end of the rack (913) points to the zero point of the scale (916); S2. Start the jack (6) to slowly extend the output rod (7) and push the connecting block (805) to the right; since the L-shaped slider (807) is slidably installed in the guide groove (802) and its left side is fixedly connected to one end of the spring (803) and the telescopic rod (804), when the connecting block (805) moves to the right, the relative distance between the connecting block (805) and the L-shaped slider (807) is shortened, and the spring (803) is gradually compressed; S3. When the compression of the spring (803) gradually increases to the point that it is sufficient to overcome the maximum static friction between the saddle (4) and the roller (3), the saddle (4) begins to slowly roll to the right, and drives the placement block (806) fixedly installed on its right side to move to the right in sync. The placement block (806) drives the rack (902) to move to the right through the extension frame (901). The rack (902) meshes with the gear (903) to make the rotating shaft (904) rotate in the rectangular frame (915), which in turn drives the trigger bar (905) fixedly installed on the outer surface of the gear (903) to deflect synchronously. During the rotation, the trigger bar (905) contacts and collides with the mechanical trigger bell (907) fixedly installed on the upper surface of the rectangular seat (906). S4. When the rotating shaft (904) rotates, it drives the pulley (908) fixedly installed on its outer surface to rotate. The pulley (908) drives the pulley (910) to rotate synchronously through the transmission belt (909). The pulley (910) drives the rotating shaft (911) fixedly installed inside to rotate. The rotating shaft (911) drives the gear (912) fixedly installed on its outer surface to rotate. The gear (912) meshes with the rack (913) and drives the rack (913) to move straight to the right under the guidance of the limit block (914). The operator can obtain the precise compression of the spring (803) at the moment of start-up by reading the value of the scale (916) opened on the upper surface of the base plate (1) pointed to by the front end of the rack (913). According to Hooke's law, the rolling friction between the saddle (4) and the roller (3) is calculated.

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