Stay cable viscous shear damper with limiting and spill-proof device and adjustable damping force

Abstract

The utility model relates to a damping-force-adjustable stay cable viscous shear damper with a limiting and spill-proof device, which comprises an upper box body, a stay cable connecting part is arranged at the upper part of the upper box body, a dustproof shell is arranged at the lower part of the upper box body, a damping plate is arranged in the middle of the dustproof shell, a lower box body is sleeved in the dustproof shell in a sliding manner, and the lower box body comprises a damping liquid shell. The damping liquid shell is sleeved with the dustproof shell, the damping plate is arranged in the damping liquid shell in a sliding mode, and damping liquid is injected into the damping liquid shell. According to the utility model, through the internal friction among molecules of the macromolecular viscous damping liquid filled between the upper box body and the lower box body, the movement energy is converted into heat energy to be dissipated, so that the damping effect is achieved. The interior is of a non-sealing structure, no working pressure exists, no sealing ring is arranged, working is reliable, and the service life is long; when the inhaul cable is subjected to unpredictable wind and rain vibration or vehicle-mounted vibration, the installation position of the damper is prevented from deviating, and viscous damping liquid is prevented from wriggling and overflowing due to forced wriggling.

Description

Technical Field

[0001] This utility model belongs to the technical field of external dampers for cable stays, and relates to a viscous shear damper for cable stays with limiting and anti-overflow devices and adjustable damping force. Background Technology

[0002] With the continuous development of modern bridge construction technology, bridge structures are trending towards taller, lighter, and lower-damped designs. Developing ultra-long, long-span flexible bridges is an international trend. In recent years, the spans and cables of cable-stayed bridges built both domestically and internationally have been steadily increasing. Cable stays are one of the main load-bearing components of cable-stayed bridges. Due to their small mass, high flexibility, and low internal damping, cable stays are highly susceptible to vibration under external environmental excitation. Continuous cable vibration can cause fatigue in the cables and anchor heads, damage to the protective layer, shorten the service life of the cables, increase bridge maintenance costs, and raise concerns about the safety of cable-stayed bridges among pedestrians. Therefore, suppressing cable vibration is essential, and many existing cable vibration damping products are available.

[0003] Existing cable-stayed cable-mounted viscous shear dampers have the following shortcomings:

[0004] 1. In existing viscous shear dampers, the upper and lower housings are flexibly connected by a high-viscosity damping fluid without any lateral restraint measures. When the stay cables are subjected to unpredictable wind and rain vibrations or vehicle-borne vibrations, if the vibration force exceeds the clamping friction of the damper cable clamps, the upper housing of the damper will rotate laterally and deviate from the center position. This may affect the aesthetics of the appearance, or even affect the performance of the damper and cause the upper and lower housings to collide rigidly, resulting in damage to the damper.

[0005] 2. To meet the required damping force, the gap between the upper damping plate and the inner wall of the lower housing of a viscous shear damper is generally small. When the damper operates at large displacements for a long time, the viscous damping fluid between the two will exhibit creeping. However, the existing lower housing structure of viscous shear dampers is open, allowing the viscous damping fluid to creep out along the inner wall, resulting in viscous damping fluid overflow and affecting the damper's performance.

[0006] 3. The viscosity of viscous damping fluid is significantly affected by ambient temperature. As the ambient temperature decreases, the viscosity of the damping fluid increases. When a certain low temperature is reached, high molecular weight viscous damping fluid becomes approximately solid, at which point the damper becomes almost a rigid connection and loses its vibration damping effect on the cables. Therefore, existing viscous shear dampers are not suitable for use in low-temperature environments, their vibration damping performance is greatly affected by temperature, and their application environments are somewhat limited.

[0007] 4. Existing cable-stayed bridge viscous (oil) dampers and similar products consist of a sealed structure composed of an end cap, cylinder, piston rod, and piston, filled with silicone oil. When external motion drives the piston rod, it compresses the internal silicone oil, causing it to dissipate energy through small holes in the piston, thus achieving vibration reduction. During operation, due to the low compressibility of silicone oil, high pressure inevitably arises inside the cylinder. If the processing and assembly precision of the damper components is insufficient, or if the seals wear out, oil leakage will occur, directly affecting the damper's service life.

[0008] 5. Most existing cable-stayed cable external dampers cannot be adjusted after assembly. A few types of dampers can be adjusted after assembly, but cannot be adjusted after being installed on the cable.

[0009] 6. Most existing external dampers for cable stays have rotating connection parts, which means there are assembly gaps. Therefore, they cannot respond quickly or suppress small high-frequency vibrations generated by the cable stays. Summary of the Invention

[0010] The purpose of this invention is to provide a viscous shear damper for stay cables with a limiting and anti-overflow device and adjustable damping force. Its features include a non-contact internal connection, no internal working pressure, no sealing ring, reliable operation, and long service life. It can not only suppress low-frequency vibrations with large amplitudes in stay cables but also effectively control small-amplitude high-frequency vibrations. Furthermore, the damper can be used normally in low-temperature environments, with minimal performance impact from temperature. The damping force can be adjusted by controlling the temperature, allowing the damper to control the vibration of stay cables with different parameters. It can prevent the damper's installation position from shifting and the viscous damping fluid from overflowing due to forced creep when the stay cable is subjected to unpredictable wind, rain, or vehicle-borne vibrations.

[0011] According to the technical solution provided by this utility model: a cable-stayed viscous shear damper with limiting and anti-overflow devices and adjustable damping force includes an upper housing, the upper part of which is a cable-stayed connection part, a dustproof shell provided at the lower part of the upper housing, a damping plate provided in the middle of the dustproof shell, a lower housing slidably fitted inside the dustproof shell, the lower housing including a damping liquid shell, the damping liquid shell being fitted inside the dustproof shell, the damping plate being slidably disposed in the damping liquid shell, the damping liquid shell being filled with damping liquid, an overflow mechanism being installed between the damping liquid shell and the upper housing, and a limiting device being provided between the damping liquid shell and the dustproof shell.

[0012] As a further improvement of this utility model, an electric heating film and a temperature sensor are installed on the damping fluid housing, and the electric heating film and temperature sensor wires are connected to an external power supply and a temperature control system.

[0013] As a further improvement of this utility model, the middle part of the upper box is a connecting pipe, the cable connection part is a cable clamp, the cable clamp is a split clamp structure, the cable clamp of the split clamp structure is connected and fixed by the first bolt, and the lower part of the cable clamp is connected to the connecting pipe.

[0014] As a further improvement of this utility model, the dustproof shell includes a top dustproof plate, and vertical dustproof plates and horizontal dustproof plates are symmetrically arranged on the four sides of the bottom of the top dustproof plate. A damping plate is installed in the middle of the bottom of the top dustproof plate.

[0015] As a further improvement of this utility model, the damping fluid housing includes a base plate, and the top of the base plate is vertically and symmetrically provided with a transverse side panel and a longitudinal side panel that are connected to each other. The heating film and the temperature sensor are installed inside the longitudinal side panel. The outer side of the heating film is covered with a protective plate, which is fixed to the longitudinal side panel with mounting bolts. The protective plate has holes.

[0016] As a further improvement of this utility model, the overflow mechanism includes an overflow trough and an overflow bellows. The overflow trough is installed on the top of the damping fluid housing, the bottom of the overflow bellows is fixedly connected to the overflow trough, and the top of the overflow bellows is connected to the dust cover through a detachable structure.

[0017] As a further improvement of this utility model, the anti-overflow corrugated pipe is made of rubber vulcanization and has a tapered rectangular tubular structure with a cord embedded inside the rubber; an installation ring is glued to the bottom of the anti-overflow corrugated pipe.

[0018] As claimed in the cable-stayed viscous shear damper with limiting and anti-overflow devices and adjustable damping force, the detachable structure, as a further improvement of the present invention, includes a thin steel sheet and a magnetic steel sheet, wherein the thin steel sheet is installed on the top of the anti-overflow corrugated pipe and the magnetic steel sheet is installed on the dustproof shell.

[0019] As a further improvement of this utility model, the limiting device includes a connecting seat, on which a roller shaft is connected by roller shaft mounting bolts. A bearing is sleeved on the outer circumference of the roller shaft, and the bearing is embedded in the roller.

[0020] As a further improvement of this utility model, the bearing is an oil-free bearing.

[0021] 1. This utility model utilizes the internal friction between molecules of a high-molecular-weight viscous damping fluid filled between the upper and lower housings to convert the energy of motion into heat energy for dissipation, thereby achieving vibration reduction. The interior is a non-sealed structure, with no working pressure and no sealing rings, ensuring reliable operation and a long service life.

[0022] 2. This utility model can prevent the damper installation position from shifting and the viscous damping fluid from overflowing due to forced creep when the cable is subjected to unpredictable wind and rain vibration or vehicle vibration.

[0023] 3. This utility model allows for adjustment of the damping force at any time after installation to adapt to the vibration of cables with different parameters.

[0024] 4. This utility model can be used normally in low-temperature environments, and its performance is less affected by temperature. It can be used in northern my country and other cold environments, and has good market prospects.

[0025] 5. Because this utility model has no moving connecting parts and no assembly gaps, it can quickly respond to and suppress small-amplitude high-frequency vibrations of the stay cable. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the installation of this utility model.

[0027] Figure 2 for Figure 1 AA sectional view.

[0028] Figure 3 This is a schematic diagram of the upper housing.

[0029] Figure 4 for Figure 3 BB cross-sectional view.

[0030] Figure 5 This is a schematic diagram of the lower housing.

[0031] Figure 6 for Figure 5 CC section view.

[0032] Figure 7 This is a schematic diagram of an anti-overflow corrugated pipe.

[0033] Figure 8 This is a schematic diagram of the limiting device. Detailed Implementation

[0034] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of 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 should fall within the protection scope of the present invention.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of the utility model described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover the inclusion, for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0037] Figure 1-8 The components include: 1. Stay cable; 2. First bolt; 3. Upper housing; 3. Cable clamp; 3-1. Connecting pipe; 3-2. Top dustproof plate; 3-3. Magnet; 3-4. Longitudinal dustproof plate; 3-5. Damping plate; 3-6. Transverse dustproof plate; 3-7. Overflow-proof corrugated pipe; 4. Thin steel sheet; 4-1. Second bolt; 5. Lower housing; 6. Overflow-proof groove; 6-1. Longitudinal side panel; 6-2. Heating film; 6-4. Temperature sensor; 6-5. Base plate; 6-6. Transverse side panel; 6-7. Damping fluid; 7. Third bolt; 8. Bracket; 9. Limiting device; 10. Roller; 10-1. Bearing; 10-2. Roller shaft; 10-3. Roller shaft mounting bolt; 10-4. Connecting seat; 10-5. Fourth bolt; 11. Power supply and temperature control system; 12, etc.

[0038] like Figure 1 As shown, this utility model is a cable-stayed viscous shear damper with a limiting and anti-overflow device and adjustable damping force. It includes an upper housing 3, the upper part of which is the cable-stayed connection part. A dustproof shell is provided at the lower part of the upper housing 3, and a damping plate 3-6 is provided in the middle of the dustproof shell. A lower housing 6 is slidably fitted inside the dustproof shell. The lower housing 6 includes a damping fluid shell, which is fitted inside the dustproof shell. The damping plate 3-6 is slidably disposed in the damping fluid shell, which is filled with damping fluid 7. An overflow mechanism is installed between the damping fluid shell and the upper housing 3, and a limiting device 10 is provided between the damping fluid shell and the dustproof shell.

[0039] like Figure 5 As shown, an electric heating film 6-4 and a temperature sensor 6-5 are installed on the damping fluid housing. The electric heating film 6-4 and the temperature sensor 6-5 are connected to an external power supply and a temperature control system 12.

[0040] like Figure 3 As shown, the middle part of the upper box 3 is the connecting pipe 3-2, the cable connection part is the cable clamp 3-1, the cable clamp 3-1 is a split clamp structure, the cable clamp 3-1 of the split clamp structure is connected and fixed by the first bolt 2, and the lower part of the cable clamp 3-1 is connected to the connecting pipe 3-2 by welding process.

[0041] like Figure 3-4As shown, the dustproof housing includes a top dustproof plate 3-3, which is a horizontally positioned rectangle. At the bottom of the top dustproof plate 3-3, vertical dustproof plates 3-5 and horizontal dustproof plates 3-7 are symmetrically arranged on all four sides via welding. A damping plate 3-6 is installed in the middle of the bottom of the top dustproof plate 3-3. There can be one or more damping plates 3-6, depending on the specific application requirements; the more plates, the greater the drag coefficient.

[0042] like Figure 5-6 As shown, the damping fluid housing includes a base plate 6-6, and the top of the base plate 6-6 is vertically and symmetrically provided with a transverse side panel 6-7 and a longitudinal side panel 6-2 connected to each other by a welding process.

[0043] like Figure 5 As shown, the heating film 6-4 and the temperature sensor 6-5 are installed inside the longitudinal side panel 6-2. The heating film 6-4 is covered with a protective plate, which is fixed to the longitudinal side panel 6-2 with mounting bolts 6-3. The protective plate has holes for the wires of the heating film 6-4 to pass through.

[0044] like Figure 1 , 5 As shown, the overflow mechanism is used to prevent the damping fluid 7 from splashing out of the damping fluid housing during the buffering process. It includes an overflow channel 6-1 and an overflow bellows 4. The overflow channel 6-1 is bolted to the top of the damping fluid housing. The bottom of the overflow bellows 4 is fixedly connected to the overflow channel 6-1, and the top of the overflow bellows 4 is connected to the dust cover via a detachable structure.

[0045] like Figure 7 As shown, the anti-overflow corrugated pipe 4 is made of rubber vulcanization and has a tapered rectangular tubular structure with a cord fabric 4-2 embedded inside the rubber. The bottom of the anti-overflow corrugated pipe 4 is glued to the mounting ring 4-3, which has a hole for connecting with the screw hole on the upper part of the anti-overflow groove 6-1 and is fixed with the second bolt 5.

[0046] The detachable structure includes a thin steel sheet 4-1 and a magnetic steel sheet 3-4. The thin steel sheet 4-1 is bonded to the top of the anti-overflow corrugated pipe 4, and the magnetic steel sheet 3-4 is installed on the top dustproof plate 3-3. Under normal conditions, the thin steel sheet 4-1 and the magnetic steel sheet 3-4 are combined to prevent the damping fluid 7 from splashing out during the buffering process. When the displacement between the upper box 3 and the lower box 6 gradually increases, the thin steel sheet 4-1 and the magnetic steel sheet 3-4 can move and connect within a certain range until they exceed the adjustment range and detach, preventing damage to the anti-overflow corrugated pipe 4.

[0047] The specific installation position of the limiting device 10 is adapted to the vibration direction of the cable stay. It is installed between the transverse dustproof plate 3-7 of the upper housing 3 and the transverse side panel 6-7 of the lower housing 6. The bottom plate 6-6 of the lower housing 6 is connected to the bracket 9 and fixed with the third bolt 8. There are bolt holes on the transverse dustproof plate 3-7 for connecting the limiting device 10.

[0048] like Figure 8 As shown, the limiting device 10 of this utility model mainly includes a roller 10-1, a bearing 10-2, a roller shaft 10-3, a roller shaft mounting bolt 10-4, and a connecting seat 10-5. The roller shaft 10-3 is connected to the connecting seat 10-5 by the roller shaft mounting bolt 10-4. The bearing 10-2 is sleeved on the outer circumference of the roller shaft 10-3 and embedded in the roller 10-1. The roller 10-1 can be made of soft materials such as rubber, polyurethane, or nylon. The connecting seat 10-5 has bolt holes and is connected to the transverse dustproof plate 3-7, and is fixed with a fourth bolt 11.

[0049] Bearing 10-2 is an oilless bearing, which has the advantages of high load capacity, impact resistance, high temperature resistance and strong self-lubrication.

[0050] Damping fluid 7 is a viscous damping fluid.

[0051] The working process of this utility model is as follows:

[0052] During installation, the upper housing 3 is connected to the cable clamp 3-1 on the stay cable 1. When the stay cable 1 vibrates, the vibration force is transmitted to the damping plate 3-6 through the cable clamp 3-1. The damping plate 3-6 reciprocates within the lower housing 6. The high-molecular-weight viscous damping fluid 7 filling the space between the damping plate 3-6 and the inner wall of the lower housing generates intermolecular friction under tension and compression, converting the kinetic energy of the motion into heat energy, which is dissipated into the atmosphere through the lower housing wall, thus suppressing the vibration of the stay cable. The damping force can be adjusted by an internal temperature control device.

[0053] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A cable-stayed cable viscous shear damper with limiting and anti-overflow device and adjustable damping force, characterized in that, The upper box (3) is provided with a cable-stayed connection at the top and a dustproof shell at the bottom. A damping plate (3-6) is provided in the middle of the dustproof shell. The lower box (6) is slidably fitted inside the dustproof shell. The lower box (6) includes a damping liquid shell, which is fitted inside the dustproof shell. The damping plate (3-6) is slidably installed in the damping liquid shell. The damping liquid shell is filled with damping liquid (7). An overflow mechanism is installed between the damping liquid shell and the upper box (3). A limiting device (10) is provided between the damping liquid shell and the dustproof shell.

2. The stay cable viscous shear damper with position limiting and anti-overflowing device and adjustable damping force according to claim 1, wherein An electric heating film (6-4) and a temperature sensor (6-5) are installed on the damping fluid housing. The electric heating film (6-4) and the temperature sensor (6-5) are connected to an external power supply and a temperature control system (12).

3. The cable-stayed cable viscous shear damper with limiting and anti-overflowing device and adjustable damping force according to claim 1, wherein, The middle part of the upper box body (3) is the connecting pipe (3-2), the cable connection part is the cable clamp (3-1), the cable clamp (3-1) is a split clamp structure, the cable clamp (3-1) of the split clamp structure is connected and fixed by the first bolt (2), and the lower part of the cable clamp (3-1) is connected to the connecting pipe (3-2).

4. The cable-stayed viscous shear damper with limiting and anti-overflowing device and adjustable damping force according to claim 1, wherein, The dustproof enclosure includes a top dustproof plate (3-3), and vertical dustproof plates (3-5) and horizontal dustproof plates (3-7) are symmetrically arranged on the four sides of the bottom of the top dustproof plate (3-3). A damping plate (3-6) is installed in the middle of the bottom of the top dustproof plate (3-3).

5. The stay cable viscous shear damper with position limiting and spill-proof device and adjustable damping force according to claim 1, wherein The damping fluid housing includes a base plate (6-6). The top of the base plate (6-6) is vertically and symmetrically provided with a transverse side panel (6-7) and a longitudinal side panel (6-2) that are connected to each other. An electrothermal film (6-4) and a temperature sensor (6-5) are installed inside the longitudinal side panel (6-2). The outer side of the electrothermal film (6-4) is covered with a protective plate. The protective plate is fixed to the longitudinal side panel (6-2) with mounting bolts (6-3). The protective plate has holes.

6. The stay cable viscous shear damper with position limiting and spill-proof device and adjustable damping force according to claim 1, wherein The overflow mechanism includes an overflow trough (6-1) and an overflow bellows (4). The overflow trough (6-1) is installed on the top of the damping fluid housing. The bottom of the overflow bellows (4) is fixedly connected to the overflow trough (6-1). The top of the overflow bellows (4) is connected to the dust cover through a detachable structure.

7. The stay cable viscous shear damper with position limiting and anti-overflowing device and adjustable damping force according to claim 6, wherein, The anti-overflow corrugated pipe (4) is made of rubber vulcanization and has a tapered rectangular tubular structure with a cord (4-2) embedded inside the rubber; the bottom of the anti-overflow corrugated pipe (4) is attached with an installation ring (4-3).

8. The stay cable viscous shear damper with position limiting and anti-overflowing device and adjustable damping force according to claim 6, wherein, The detachable structure includes a thin steel sheet (4-1) and a magnetic steel sheet (3-4). The thin steel sheet (4-1) is installed on the top of the anti-overflow corrugated pipe (4), and the magnetic steel sheet (3-4) is installed on the dustproof shell.

9. The stay cable viscous shear damper with position limiting and anti-overflowing device and adjustable damping force according to claim 1, wherein, The limiting device (10) includes a connecting seat (10-5), and the connecting seat (10-5) is connected to the roller shaft (10-3) by a roller shaft mounting bolt (10-4). The outer circumference of the roller shaft (10-3) is fitted with a bearing (10-2) through a bearing (10-2), and the bearing (10-2) is embedded in the roller (10-1).

10. The stay cable viscous shear damper with position limiting and anti-overflowing device and adjustable damping force according to claim 9, wherein, The bearing (10-2) is an oil-free bearing.

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