Bridge cable damper

Abstract

The invention discloses a bridge inhaul cable damper, and belongs to the technical field of dampers, the bridge inhaul cable damper comprises a damping sleeve, a movable rod is slidably mounted in the damping sleeve, the ends, away from each other, of the damping sleeve and the movable rod are fixedly connected with a multi-point vibration reduction mechanism, the multi-point vibration reduction mechanism comprises a fixed seat, and a universal ball is rotatably mounted in the fixed seat; the outermost end of the universal ball is connected with a vibration transmission mechanism through a connecting rod, the vibration transmission mechanism comprises a supporting bottom plate fixedly connected with the connecting rod, a plurality of guide groove bodies are fixedly installed on the periphery of the supporting bottom plate, and sliding blocks are installed in the guide groove bodies in a sliding mode; buffering rods are fixedly connected between the two sides of the sliding blocks and the inner side walls of the guiding groove bodies, and a connecting base is fixedly installed in the center of the top of the supporting bottom plate. According to the multi-stage vibration reduction device, multi-stage vibration reduction arrangement is adopted, the vibration reduction effect is more comprehensive, the equipment type selection and operation and maintenance cost of a project can be greatly reduced, and the multi-stage vibration reduction device is particularly suitable for complex vibration control scenes of long-span bridge super-long inhaul cables.

Description

Technical Field

[0001] This invention belongs to the technical field of dampers, specifically a bridge cable damper. Background Technology

[0002] Bridge cables are the core load-bearing components of long-span bridges. Their flexible nature makes them highly susceptible to external factors such as wind loads, pulsating vehicle loads, and temperature stress, resulting in multimodal vibration responses including in-plane oscillation, out-of-plane torsion, and high-frequency small-amplitude vibrations. Prolonged irregular vibrations can cause fatigue damage to the cable wires and cracking and peeling of the protective layer, and may also trigger bridge structural resonance, seriously threatening the bridge's operational safety and service life. Therefore, configuring efficient cable dampers is a key technical means to suppress cable vibration and ensure bridge safety.

[0003] Currently, existing bridge cable dampers generally adopt a design scheme with a single stress point and fixed structural parameters, which has many technical defects. First, traditional dampers are mostly connected to the cable through a single hinge support or cable clamp, and the vibration load can only be transmitted through a single point. The vibration reduction parameters cannot be adjusted after leaving the factory, making it difficult to adapt to the different vibration characteristics of the cable under different wind conditions, load levels, and temperature conditions. The suppression effect on large-area out-of-field vibration or high-frequency small-amplitude vibration is limited, and there is a significant vibration reduction blind zone. Second, the contact constraint range of existing dampers is fixed, which can only match cables of a specific diameter. Different models of dampers need to be customized for different specifications of cables, which not only increases the project procurement and inventory costs, but also prolongs the construction and installation cycle. Third, traditional dampers are mostly single-stage energy dissipation structures, and the vibration load is directly transmitted to the core damping component. There is a lack of buffering and energy dissipation links for instantaneous peak loads, which can easily lead to overload damage of the damper. At the same time, it is difficult to achieve full-dimensional energy dissipation of multi-directional vibration, resulting in low vibration reduction efficiency.

[0004] In summary, existing cable dampers suffer from poor adaptability, low versatility, and limited vibration reduction efficiency, failing to meet the vibration reduction requirements of long-span bridge cables under complex working conditions. Therefore, developing a cable damper that can adapt to different cable specifications, adjust vibration reduction parameters, and possess multi-stage buffering and energy dissipation functions has become an urgent technical challenge to be solved in this field. Summary of the Invention

[0005] This invention provides a bridge cable damper that can solve the following problems in the prior art: (1) Traditional dampers are mostly connected to cables through a single hinge support or cable clamp. Vibration loads can only be transmitted through a single point. The damping parameters cannot be adjusted after leaving the factory. It is difficult to adapt to the different vibration characteristics of cables under different wind conditions, load levels and temperature conditions. The damping effect is limited on large-scale external vibration or high-frequency small-amplitude vibration, and there is an obvious damping blind zone. (2) The contact constraint range of the existing dampers is fixed and can only match cables of a specific diameter. Different models of dampers need to be customized for cables of different specifications, which not only increases the engineering procurement and inventory costs, but also extends the construction and installation cycle. (3) Traditional dampers are mostly single-stage energy dissipation structures. Vibration loads are directly transmitted to the core damping components. They lack a buffer and energy dissipation link for instantaneous peak loads, which can easily lead to overload damage of the damper. At the same time, it is difficult to achieve full-dimensional energy dissipation of multi-directional vibrations, resulting in low vibration reduction efficiency.

[0006] A bridge cable damper includes a damping sleeve, a movable rod slidably installed inside the damping sleeve, and a multi-point vibration damping mechanism fixedly connected to the ends of the damping sleeve and the movable rod that are away from each other. The multi-point vibration damping mechanism includes a fixed base, in which a universal ball is rotatably mounted, and the outermost end of the universal ball is connected to a vibration transmission mechanism via a connecting rod.

[0007] As a further technical solution of the present invention, the vibration transmission mechanism includes a support base plate fixedly connected to a connecting rod. A plurality of guide grooves are fixedly installed on the periphery of the support base plate. A slider is slidably installed in the guide groove. Buffer rods are fixedly connected between the two sides of the slider and the inner sidewall of the guide groove. A connecting base is fixedly installed at the top center of the support base. A lead screw is rotatably installed in the connecting base. A threaded sleeve is threadedly connected to the outside of the lead screw. A receiving base plate is fixedly installed around the threaded sleeve. A plurality of movable seats one are fixedly installed at the bottom edge of the receiving base plate. A movable seat two is fixedly installed on the top of the slider. A branch rod is movably connected between adjacent movable seats one and movable seats two.

[0008] As a further technical solution of the present invention, a top plate is fixedly connected to the top end of the lead screw, and a nut is integrally connected to the outside of the top plate, and a hinge seat is fixedly connected to the top end of the top plate.

[0009] As a further technical solution of the present invention, a planar bearing is embedded inside the connecting base, and one end of the lead screw located inside it is rotatably connected to the planar bearing.

[0010] As a further technical solution of the present invention, the branch rod is installed at an angle, and a shaft is fixedly installed on the inner side of both the movable seat one and the movable seat two. The two ends of the branch rod are movably connected to the corresponding movable seat one and movable seat two through the shaft.

[0011] As a further technical solution of the present invention, a sliding groove is also provided inside the guide groove, and the slider is slidably connected to the sliding groove.

[0012] As a further technical solution of the present invention, the buffer rod includes a fixed cylinder, a sliding rod is slidably connected inside the fixed cylinder, and a limiting plate one is fixedly connected to one end of the sliding rod inside the fixed cylinder, a limiting plate two is fixedly installed at the bottom end of the sliding rod, and a spring is connected between the limiting plate one and the limiting plate two.

[0013] As a further technical solution of the present invention, a guide sleeve is embedded at the top of the fixed cylinder, and the sliding rod is sleeved on the inner side of the guide sleeve.

[0014] As a further technical solution of the present invention, the end of the fixed cylinder away from the sliding rod is fixedly connected to the inner side wall of the guide groove, and the end of the sliding rod away from the fixed cylinder is fixedly connected to the side wall of the slider.

[0015] As a further technical solution of the present invention, the damping sleeve and the fixed seat that are fixedly connected to the opposite end of the movable rod are symmetrically installed, the upper hinge seat is used to connect and fix with the cable, and the lower hinge seat is used to connect and fix with the bridge beam.

[0016] The beneficial effects of the present invention are as follows: By setting up a multi-point vibration reduction mechanism and using multiple branch rods to transmit vibration, the present invention effectively avoids the problem that the vibration reduction parameters of the traditional damper are fixed when there is only a single force point, and cannot cope with the changes in the vibration characteristics of the cable under different wind conditions, loads and temperatures. By setting a lead screw and a threaded sleeve, the position of the threaded sleeve on its surface can be adjusted by rotating the lead screw, thereby adjusting the position of the base plate. By moving the base plate up and down, the expansion range of multiple branch rods can be adjusted. When used with cables of different diameters, the expansion range of the corresponding branch rods can be adjusted to adapt to the vibration intensity of cables of different diameters. Furthermore, by setting a slider and buffer rods on both sides inside the guide groove, the slider is connected to the branch rod through the movable seat two. When the branch rod transmits vibration, the supporting base plate drives the slider to slide in the groove of the guide groove through the branch rod. At this time, the spring of the buffer rod is stretched or compressed to complete the first stage of buffering. At the same time, the remaining vibration is transmitted to the universal ball through the supporting base plate. The universal ball rotates adaptively to match the vibration direction and is then transmitted to the damping rod through the fixed seat. The damping rod completes the second stage of energy dissipation and vibration reduction, thereby achieving a multi-stage vibration reduction effect and making the overall effect of the damper better. Attached Figure Description

[0017] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a structural diagram of the multi-point vibration damping mechanism of the present invention; Figure 3 This is an assembly structure diagram of the receiving base plate of the present invention; Figure 4 This is a structural diagram of the guide groove in this invention; Figure 5 This is a diagram of the internal structure of the buffer rod in this invention.

[0019] In the diagram: 1. Damping sleeve; 2. Movable rod; 3. Multi-point vibration damping mechanism; 301. Fixed seat; 302. Universal ball; 303. Support base plate; 304. Guide groove; 305. Lead screw; 306. Connecting base; 307. Threaded sleeve; 308. Support base plate; 309. Hinge seat; 310. Top plate; 311. Nut; 312. Movable seat one; 313. Branch rod; 314. Slider; 315. Slide groove; 316. Buffer rod; 3161. Fixed cylinder; 3162. Sliding rod; 3163. Limiting plate one; 3164. Limiting plate two; 3165. Spring; 317. Movable seat two. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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] like Figures 1-5 As shown, a bridge cable damper includes a damping sleeve 1, a movable rod 2 slidably installed inside the damping sleeve 1, and a multi-point damping mechanism 3 fixedly connected to one end of the damping sleeve 1 and the movable rod 2 away from each other. The multi-point vibration damping mechanism 3 includes a fixed base 301, in which a universal ball 302 is rotatably mounted, and the outermost end of the universal ball 302 is connected to a vibration transmission mechanism via a connecting rod.

[0022] The vibration transmission mechanism includes a support base plate 303 fixedly connected to a connecting rod. Several guide grooves 304 are fixedly installed on the periphery of the support base plate 303. A slider 314 is slidably installed in the guide groove 304. Buffer rods 316 are fixedly connected between the two sides of the slider 314 and the inner sidewall of the guide groove 304. A connecting base 306 is fixedly installed at the top center of the support base plate 303. A lead screw 305 is rotatably installed in the connecting base 306. A threaded sleeve 307 is threadedly connected to the outside of the lead screw 305. A receiving base plate 308 is fixedly installed around the threaded sleeve 307. Several movable seats 312 are fixedly installed at the bottom edge of the receiving base plate 308. A movable seat 317 is fixedly installed on the top of the slider 314. A branch rod 313 is movably connected between adjacent movable seats 312 and movable seats 317.

[0023] Specifically, when the lead screw 305 rotates, its external threaded sleeve 307 can move up and down on its surface. The up and down movement of the threaded sleeve 307 drives the branch rod 313 to move up and down. Since both ends of the branch rod 313 are movably connected, the branch rod 313 tilts adaptively with the movement of the base plate 308. At this time, the slider 314 can slide in the guide groove 304, thereby adapting to the tilt angle of the branch rod 313. As the slider 314 slides, the corresponding buffer rod 316 is stretched or compressed, thereby playing a buffering role.

[0024] A top plate 310 is fixedly connected to the top end of the lead screw 305, and a nut 311 is integrally connected to the outside of the top plate 310. A hinge seat 309 is fixedly connected to the top end of the top plate 310. A plane bearing is embedded inside the connecting base 306, and one end of the lead screw 305 located inside it is rotatably connected to the plane bearing.

[0025] Specifically, by setting nut 311, the screw 305 can be rotated by rotating nut 311, thereby adjusting the position of threaded sleeve 307 on its outside.

[0026] The branch rod 313 is installed at an angle. The inner sides of the movable seat 312 and the movable seat 317 are both fixedly installed with shafts. The two ends of the branch rod 313 are movably connected to the corresponding movable seat 312 and movable seat 317 through the shafts.

[0027] Specifically, because the branch rod 313 is movably connected to the corresponding movable seat 312 and movable seat 317 via the shaft, its two ends can move and can adapt to the up and down movement of the support base plate 303 to make changes in the tilt angle.

[0028] The guide groove 304 is also provided with a sliding groove 315, and the slider 314 is slidably connected to the sliding groove 315.

[0029] Specifically, by setting the slider 314 to slide in the groove 315, the slider 314 can slide inside the guide groove 304 when the inclination of the branch rod 313 changes.

[0030] The buffer rod 316 includes a fixed cylinder 3161, a sliding rod 3162 is slidably connected inside the fixed cylinder 3161, and a limiting plate 3163 is fixedly connected to one end of the sliding rod 3162 inside the fixed cylinder 3161. A limiting plate 3164 is fixedly installed at the bottom of the inner side of the sliding rod 3162. A spring 3165 is connected between the limiting plate 3163 and the limiting plate 3164. A guide sleeve is embedded at the top of the fixed cylinder 3161, and the sliding rod 3162 is sleeved on the inner side of the guide sleeve. The end of the fixed cylinder 3161 away from the sliding rod 3162 is fixedly connected to the inner side wall of the guide groove 304, and the end of the sliding rod 3162 away from the fixed cylinder 3161 is fixedly connected to the side wall of the slider 314.

[0031] Specifically, as the tilt angle of the branch rod 313 changes, it pulls the slider 314 to move, thereby stretching the buffer rod 316 on one side of the slider 314 and compressing the buffer rod 316 on the other side, thus playing a buffering role.

[0032] The damping sleeve 1 and the fixed base 301, which are fixedly connected to one end of the movable rod 2 away from each other, are installed symmetrically. The upper hinge base 309 is used to connect and fix with the cable, and the lower hinge base 309 is used to connect and fix with the bridge beam.

[0033] The present invention discloses a bridge cable damper. In use, the damping sleeve 1 is connected to the movable rod 2 to form a damping rod. The two ends of the damping rod are connected to the multi-point vibration reduction mechanism 3, so that both ends have a vibration reduction effect. The multi-point vibration reduction mechanism 3 at the upper and lower ends is respectively connected and fixed to the cable and the main beam of the bridge.

[0034] During the pre-installation stage, the cable diameter and target vibration conditions are measured first. If a large-diameter cable is suitable, the nut 311 is rotated to make the screw 305 drive the threaded sleeve 307 to move down, and the receiving base plate 308 descends synchronously. The branch rod 313 opens outward with the movable seat 1 312 and movable seat 2 317 as the axial direction, which can stably constrain the large-scale outward vibration of the cable.

[0035] If it is suitable for small-diameter cables, the nut 311 is rotated in the opposite direction to move the threaded sleeve 307 upward, the base plate 308 is raised, and the branch rod 313 is retracted inward to adapt to small-amplitude high-frequency vibration.

[0036] After installation, the fixed cylinder 3161 of the buffer rod 316 cooperates with the sliding rod 3162. The first limiting plate 3163 and the second limiting plate 3164 can prevent the spring 3165 from disengaging, ensuring the stability of the first-level buffer. The universal ball 302 is embedded in the cavity of the fixed seat 301. When rotating, it relies on the radial constraint of the cavity. After the vibration disappears, it can automatically reset with the rebound force of the spring 3165, ensuring the reliability of long-term vibration reduction.

[0037] When the cable vibrates, it is first transmitted to the receiving base plate 308 through the hinge seat 309 at the top of the lead screw 305. Multiple branch rods 313 transmit the vibration. As the universal ball 302 rotates, the receiving base plate 308 drives the slider 314 to slide in the groove 315 of the guide groove 304 through the branch rods 313. At this time, the spring 3165 of the buffer rod 316 is stretched or compressed to complete the first-level buffer. At the same time, the remaining vibration is transmitted to the universal ball 302 through the support base plate 303. The universal ball 302 rotates adaptively to match the vibration direction and is then transmitted to the damping rod through the fixed seat 301. The damping rod completes the second-level energy dissipation and vibration reduction, thereby achieving the vibration reduction effect.

[0038] When used with different cables, the expansion range of the branch rod 313 can be adjusted. By rotating the nut 311, the lead screw 305 is driven to rotate. When the lead screw 305 is rotated, the threaded sleeve 307 moves down on its surface. Because the branch rod 313 is movably connected to the corresponding movable seat 312 and movable seat 317 through the shaft, its two ends can move. As the base plate 308 moves down, the expansion range of each branch rod 313 increases. At this time, it can be adapted to large-scale external vibration.

[0039] Conversely, when the rotating lead screw 305 causes the threaded sleeve 307 to move up on its surface, the upward movement of the receiving base plate 308 can reduce the expansion range of each branch rod 313, making it suitable for small-amplitude high-frequency vibration. This allows for adjustments to be made before pre-installation for different cable operating conditions.

[0040] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A bridge cable damper, comprising a damping sleeve (1), wherein a movable rod (2) is slidably installed inside the damping sleeve (1), characterized in that, The damping sleeve (1) and the movable rod (2) are both fixedly connected to a multi-point vibration damping mechanism (3) at the ends away from each other. The multi-point vibration damping mechanism (3) includes a fixed base (301), a universal ball (302) is rotatably installed inside the fixed base (301), and the outermost end of the universal ball (302) is connected to a vibration transmission mechanism through a connecting rod.

2. A bridge cable damper according to claim 1, characterized in that, The vibration transmission mechanism includes a support base plate (303) fixedly connected to a connecting rod. Several guide grooves (304) are fixedly installed on the periphery of the support base plate (303). A slider (314) is slidably installed in the guide groove (304). Buffer rods (316) are fixedly connected between the two sides of the slider (314) and the inner sidewall of the guide groove (304). A connecting base (306) is fixedly installed at the top center of the support base plate (303). A lead screw (305) is rotatably installed in the connecting base (306). A threaded sleeve (307) is threadedly connected to the outside of the lead screw (305). A receiving base plate (308) is fixedly installed around the threaded sleeve (307). Several movable seats (312) are fixedly installed at the bottom edge of the receiving base plate (308). A movable seat (317) is fixedly installed on the top of the slider (314). A branch rod (313) is movably connected between adjacent movable seats (312) and movable seats (317).

3. A bridge cable damper according to claim 2, characterized in that, The top end of the lead screw (305) is fixedly connected to a top plate (310), and a nut (311) is integrally connected to the outside of the top plate (310). The top end of the top plate (310) is fixedly connected to a hinge seat (309).

4. A bridge cable damper according to claim 2, characterized in that, The connecting base (306) is internally fitted with a planar bearing, and one end of the lead screw (305) located inside it is rotatably connected to the planar bearing.

5. A bridge cable damper according to claim 3, characterized in that, The branch rod (313) is installed at an angle. The inner sides of the movable seat one (312) and the movable seat two (317) are fixedly installed with shafts. The two ends of the branch rod (313) are movably connected to the corresponding movable seat one (312) and movable seat two (317) through the shafts.

6. A bridge cable damper according to claim 5, characterized in that, The guide groove (304) is also provided with a sliding groove (315), and the slider (314) is slidably connected to the sliding groove (315).

7. A bridge cable damper according to claim 5, characterized in that, The buffer rod (316) includes a fixed cylinder (3161), a sliding rod (3162) is slidably connected inside the fixed cylinder (3161), and a limiting plate (3163) is fixedly connected to one end of the sliding rod (3162) inside the fixed cylinder (3161). A limiting plate (3164) is fixedly installed at the bottom inside the sliding rod (3162), and a spring (3165) is connected between the limiting plate (3163) and the limiting plate (3164).

8. A bridge cable damper according to claim 7, characterized in that, The top of the fixed cylinder (3161) is fitted with a guide sleeve, and the sliding rod (3162) is sleeved on the inner side of the guide sleeve.

9. A bridge cable damper according to claim 7, characterized in that, The end of the fixed cylinder (3161) away from the sliding rod (3162) is fixedly connected to the inner wall of the guide groove (304), and the end of the sliding rod (3162) away from the fixed cylinder (3161) is fixedly connected to the side wall of the slider (314).

10. A bridge cable damper according to claim 9, characterized in that, The damping sleeve (1) and the fixed seat (301) that are fixedly connected to the movable rod (2) at one end are installed symmetrically. The upper hinge seat (309) is used to connect and fix with the cable, and the lower hinge seat (309) is used to connect and fix with the bridge beam.

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