Power transmission tower flexible connecting and monitoring structure based on dynamic damping

Abstract

The invention discloses a power transmission tower flexible connecting and monitoring structure based on dynamic damping, which relates to the technical field of power transmission tower structures, and comprises an adjustable spherical hinge anchorage device arranged at the tower body end and a universal joint connecting seat arranged at the cross arm end, the adjustable spherical hinge anchorage device is connected with the universal joint connecting base through a high-strength galvanized steel strand, a multi-stage damping device is arranged in the middle of the high-strength galvanized steel strand, a displacement sensor is arranged in the universal joint connecting base, and a vibration sensor is arranged at the joint of the cross arm end and the universal joint connecting base. Through flexible connection of the steel strands and the synergistic effect of the multi-stage damping shock absorption device and the intelligent regulation and control system, the problem of stress concentration of traditional rigid connection is solved, and self-adaptive absorption of vibration energy of different frequencies is achieved.

Description

Technical Field

[0001] This invention relates to the field of power transmission tower structure technology, and in particular to a flexible connection and monitoring structure for power transmission towers based on dynamic damping. Background Technology

[0002] Traditional power transmission towers typically use rigid connections between the crossarm and the tower body, such as welding or bolting. When ground deformation, strong winds, or earthquake loads occur, stress concentration at the connection point can easily lead to structural damage.

[0003] In mining areas, surface subsidence or horizontal displacement forces the crossarm and tower body to move relative to each other. Rigid connections cannot release deformation energy, leading to tower tilting and main material fracture. In typhoon areas, high-frequency vibrations caused by strong winds can easily cause fatigue cracking of rigid nodes, or even tower collapse. In seismic zones, seismic loads cause violent structural vibrations. Rigid connections lack energy dissipation mechanisms and are prone to brittle failure.

[0004] In existing technologies, flexible connection technologies often use a single damping element, such as a rubber pad, but using a single damping element has certain drawbacks.

[0005] First, a single damping element cannot adapt to different frequency loads; it is prone to insufficient energy dissipation during low-frequency vibrations and damping saturation during high-frequency vibrations. Second, it is difficult to adjust the preload of a single damping element, making it difficult to balance connection stiffness and deformation adaptability. Finally, traditional systems lack real-time monitoring and intelligent control, making it impossible to dynamically optimize connection performance.

[0006] Therefore, a flexible connection and monitoring structure for transmission towers based on dynamic damping is provided to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a flexible connection and monitoring structure for transmission towers based on dynamic damping. By using methods such as multi-level energy consumption, intelligent control, and flexible force transmission, this invention solves the stress concentration problem of traditional rigid connections in transmission towers and improves the safety and reliability of the towers under complex working conditions.

[0008] To achieve the above objectives, the present invention provides a flexible connection and monitoring structure for transmission towers based on dynamic damping, including an adjustable ball joint anchor at one end of the tower body and a universal joint connector at the other end of the crossarm. The adjustable ball joint anchor and the universal joint connector are connected by high-strength galvanized steel strand. A multi-stage damping and vibration reduction device is provided in the middle of the high-strength galvanized steel strand. A displacement sensor is provided inside the universal joint connector, and a vibration sensor is provided at the connection between the crossarm and the universal joint connector.

[0009] Preferably, the displacement sensor, vibration sensor, and multi-stage damping shock absorber are all connected to the central controller via electrical circuits. The accuracy of the displacement sensor is set to ±0.1mm, the monitoring frequency range of the vibration sensor is set to 0.1Hz-50Hz, and the adjustment response time of the central controller is no more than 0.1s.

[0010] Preferably, the adjustable ball joint anchor includes a ball head base and a rotating ball head disposed inside the ball head base. The rotating ball head is equipped with a hydraulic jack, the rotation range of the rotating ball head is set to 0°-360°, and the deflection angle of the rotating ball head is set to ±5°.

[0011] Preferably, the multi-stage damping shock absorption device includes a magnetorheological fluid damper and a weather-resistant rubber energy-dissipating sleeve disposed on the outside of the magnetorheological fluid damper. The magnetorheological fluid damper includes a cylinder and a drive device disposed on the top of the cylinder. A push rod is disposed at the bottom of the drive device.

[0012] Preferably, the push rod is located inside the cylinder body, with a helical spring at the top of the push rod, a piston in the middle of the push rod, an iron core at the bottom of the push rod, an electromagnetic coil on the outer surface of the iron core, and magnetorheological fluid in the internal cavity of the cylinder body.

[0013] Preferably, the elastic coefficient of the helical spring is set to be in the range of 50N / mm-100N / mm, the damping coefficient of the magnetorheological fluid damper is set to be in the range of 0.5N·s / mm-5N·s / mm, the Shore hardness of the weather-resistant rubber energy-dissipating sleeve is set to 60A, and the Shore hardness error of the weather-resistant rubber energy-dissipating sleeve is set to ±5A.

[0014] Preferably, the diameter range of the high-strength galvanized steel strand is set to 12mm-16mm, and the breaking tensile strength of the high-strength galvanized steel strand is not less than 150kN.

[0015] Therefore, the present invention employs the above-mentioned flexible connection and monitoring structure for transmission towers based on dynamic damping, which has the following beneficial effects:

[0016] (1) This scheme has significant stress release capability. The combination of flexible steel strand connection with ball joint and universal joint can effectively avoid stress concentration at the connection, release more than 90% of rigid stress, and significantly reduce the internal stress of the structure caused by external load or deformation. It has been tested and can withstand mining deformation with a surface inclination rate of no more than 3‰, showing excellent deformation coordination capability and stability.

[0017] (2) This solution has high energy efficiency in multiple frequencies. The three-level energy dissipation system of helical spring, magnetorheological fluid damper and rubber sleeve is divided into three levels according to frequency band. It can cover the full frequency band vibration from 0.1Hz to 50Hz, avoid the performance shortcomings of a single structure under wide frequency vibration, and comprehensively improve the energy conversion efficiency. The energy dissipation efficiency is more than 50% higher than that of a single damping structure.

[0018] (3) This solution can achieve intelligent adaptive control. The vibration sensor and the central controller form a closed-loop control. The vibration sensor monitors the vibration state in real time and feeds the data back to the central controller to achieve dynamic optimization and adjustment of the damping parameters. The damping parameter adjustment response time is no more than 0.1s. It seamlessly integrates sensing, decision-making and execution, and can match the working conditions in real time to achieve intelligent and efficient damping control, significantly improving equipment life and operating efficiency.

[0019] (4) This solution is highly adaptable to the environment. The weather-resistant rubber sleeve and hot-dip galvanized steel strand can adapt to the temperature range of -40℃ to 80℃ and corrosive environments such as acid rain and salt spray. It can maintain structural integrity and functional stability even in harsh environments, with a service life of not less than 30 years. It has excellent environmental adaptability and long-term durability.

[0020] The method of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a structural diagram of a flexible connection and monitoring structure for transmission towers based on dynamic damping, according to the present invention.

[0022] Figure 2 This is a structural diagram of the transmission tower of the present invention;

[0023] Figure 3 This is a structural diagram of the adjustable ball joint anchor of the present invention;

[0024] Figure 4 This is a structural diagram of the multi-stage damping vibration reduction device of the present invention.

[0025] The components include: 1. Tower body end; 2. Adjustable ball joint anchor; 3. Crossarm end; 4. Universal joint connector; 5. High-strength galvanized steel strand; 6. Multi-stage damping and vibration reduction device; 7. Displacement sensor; 8. Vibration sensor; 9. Electrical wiring; 10. Central controller; 11. Ball head base; 12. Rotating ball head; 13. Hydraulic jack; 14. Helical spring; 15. Magnetorheological fluid damper; 16. Weather-resistant rubber energy-consuming sleeve; 17. Magnetorheological fluid; 18. Cylinder; 19. Drive device; 20. Iron core; 21. Push rod; 22. Piston; 23. Electromagnetic coil. Detailed Implementation

[0026] The method of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Unless otherwise defined, the methodological or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0028] The terms "comprising" or "including" as used in this invention mean that the element preceding the term encompasses the element listed after the term, and do not exclude the possibility of encompassing other elements. Terms such as "inner," "outer," "upper," and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. In this invention, unless otherwise explicitly specified and limited, the term "attached" and similar terms should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two elements or the interaction relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] Example

[0030] like Figure 1-Figure 4 As shown, the present invention provides a flexible connection and monitoring structure for transmission towers based on dynamic damping, including an adjustable ball joint anchor 2 installed at the tower body end 1 and a universal joint connector 4 installed at the crossarm end 3. The adjustable ball joint anchor 2 includes a ball head base 11 and a rotating ball head 12 installed inside the ball head base 11. A hydraulic jack 13 is installed on the rotating ball head 12. The adjustable ball joint anchor 2 dynamically adjusts the preload of the high-strength galvanized steel strand 5 through the hydraulic jack 13 to adapt to the load requirements under different working conditions.

[0031] The rotation range of the rotating ball head 12 is set to 0°-360°, and the deflection angle of the rotating ball head 12 is set to ±5°. That is, the rotating ball head 12 can generate a relative rotation of ±5° between the tower end 1 and the crossarm end 3, thereby releasing bending stress.

[0032] The adjustable ball joint anchor 2 and the universal joint connecting seat 4 are connected by a high-strength galvanized steel strand 5. The diameter of the high-strength galvanized steel strand 5 is set to 12mm-16mm, and the breaking tensile force of the high-strength galvanized steel strand 5 is not less than 150kN. A multi-stage damping and shock absorption device 6 is set in the middle of the high-strength galvanized steel strand 5. Compared with traditional rigid connectors, the high-strength galvanized steel strand 5 uses its flexible characteristics to transmit dynamic loads, allowing relative displacement between the crossarm end 3 and the tower body end 1.

[0033] The joint of the universal joint connector 4 can rotate in multiple directions, allowing the crossarm end 3 to deflect freely in the horizontal and vertical directions, reducing the bending moment of the connection node. The universal joint connector 4 is equipped with a displacement sensor 7, the accuracy of which is set to ±0.1mm, to monitor the relative displacement of the connection node between the tower end 1 and the crossarm end 3 in real time.

[0034] A vibration sensor 8 is installed at the connection between the crossarm end 3 and the universal joint connector 4. The monitoring frequency range of the vibration sensor 8 is set to 0.1Hz-50Hz, and it collects data such as vibration amplitude and frequency in real time.

[0035] Displacement sensor 7, vibration sensor 8, and multi-stage damping shock absorber 6 are all connected to central controller 10 via electrical circuit 9. Displacement sensor 7 and vibration sensor 8 output displacement data of the connection node to central controller 10 in real time. The algorithm built into central controller 10 automatically adjusts the current of magnetorheological fluid damper according to vibration frequency and amplitude, automatically matching the optimal damping parameters. The adjustment response time of central controller 10 is no more than 0.1s, forming a closed loop of monitoring, analysis, and control.

[0036] The multi-stage damping shock absorber 6 is a three-layer concentric cylindrical structure, including a helical spring 14, a magnetorheological fluid damper 15, and a weather-resistant rubber energy-dissipating sleeve 16. The helical spring 14 provides initial buffering in the inner layer and preferentially absorbs low-frequency energy, such as slow deformation caused by mining. The magnetorheological fluid damper 15 in the middle changes the damping coefficient by adjusting the current, adaptively matching medium and high frequency vibrations, such as wind vibration and earthquakes. It has a fast response speed and can adjust the energy dissipation capacity in real time. The weather-resistant rubber energy-dissipating sleeve 16 wraps the magnetorheological fluid damper 15, isolating the environment in the outer layer to prevent magnetorheological fluid leakage, and at the same time assisting in energy dissipation through the elastic deformation of the rubber.

[0037] The weather-resistant rubber energy-dissipating sleeve 16 is set outside the magnetorheological fluid damper 15. The Shore hardness of the weather-resistant rubber energy-dissipating sleeve 16 is set to 60A, and the Shore hardness error of the weather-resistant rubber energy-dissipating sleeve 16 is set to ±5A.

[0038] The damping coefficient of the magnetorheological fluid damper 15 is set in the range of 0.5 N·s / mm to 5 N·s / mm, and the damping coefficient is adjusted by an electromagnetic coil.

[0039] The magnetorheological fluid damper 15 includes a cylinder 18 and a drive device 19 disposed on the top of the cylinder 18. A push rod 21 is disposed at the bottom of the drive device 19 and is disposed inside the cylinder 18. A helical spring 14 is disposed at the top of the push rod 21 and the elastic coefficient of the helical spring 14 is set to be in the range of 50N / mm-100N / mm.

[0040] A piston 22 is provided in the middle of the push rod 21, an iron core 20 is provided at the bottom of the push rod 21, an electromagnetic coil 23 is provided on the outer surface of the iron core 20, and a magnetorheological fluid 17 is provided in the internal cavity of the cylinder 18.

[0041] Before practical application, the structure must be installed. The installation process specifically includes:

[0042] Weld connecting lugs to the tower body end 1 and crossarm end 3, and fix the high-strength galvanized steel strand 5 to the adjustable ball joint anchor 2 and universal joint connecting seat 4 with high-strength bolts; install the multi-stage damping shock absorption device 6 in the middle of the high-strength galvanized steel strand 5 to ensure that the components of each layer are installed coaxially; connect the electrical circuit 9 to the central controller 10 through the waterproof connector; adjust the preload of the high-strength galvanized steel strand 5 to the design value, such as 50kN-80kN, through the hydraulic jack 13; calibrate the initial displacement of the connection node through the displacement sensor 7.

[0043] Then, debugging and monitoring are carried out. The debugging and monitoring process specifically includes:

[0044] A vibration table was used to simulate loads at different frequencies. In this embodiment, the simulated load frequencies were 0.5Hz, 10Hz, and 30Hz, respectively. The energy dissipation effect of the damping device was tested, and the parameters of the central controller 10 were adjusted to the optimal value. The damping device was inspected regularly, and the preload of the high-strength galvanized steel strand 5 was checked to ensure that the preload error of the high-strength galvanized steel strand 5 was not greater than ±5%. The working current of the magnetorheological fluid damper 15, the integrity of the weather-resistant rubber energy dissipation sleeve 16, and the stability of sensor data transmission were also checked.

[0045] When the connection structure of this embodiment is applied to power transmission towers in mining areas, it can reduce the risk of structural damage caused by surface deformation; when applied to power transmission towers in typhoon areas or earthquake zones, it can improve wind and earthquake resistance and reduce vibration fatigue damage; when applied to newly built power transmission lines, it can be directly used as a standard flexible connection structure to replace traditional rigid nodes.

[0046] In practical applications, the connection structure of this embodiment includes three stages: a flexible force transmission stage, a multi-level energy consumption stage, and an intelligent control stage. Specifically, these stages are as follows:

[0047] (1) Flexible force transmission stage: When the tower is subjected to mining or wind load, the tower end 1 and the crossarm end 3 will have relative displacement. The high-strength galvanized steel strand 5 absorbs part of the stress through flexible deformation. The adjustable ball joint anchor 2 and the universal joint connection seat 4 release the rotational degree of freedom, avoiding stress concentration in the rigid connection.

[0048] (2) Multi-stage energy consumption stage: When mining deformation occurs and the frequency is less than 1Hz, it is a low-frequency vibration. The helical spring 14 is compressed first, and the energy is buffered through elastic deformation.

[0049] When wind-induced vibration or earthquake occurs, and the frequency is between 1Hz and 50Hz, it is a medium-to-high frequency vibration. The vibration sensor 8 triggers the central controller 10 to adjust the working current of the magnetorheological fluid damper 15, increase the damping coefficient, and quickly absorb energy.

[0050] Under all operating conditions, the weather-resistant rubber energy-dissipating sleeve 16 dissipates residual energy through hysteretic deformation and protects internal components;

[0051] (3) Intelligent control stage: The central controller 10 dynamically adjusts the damping parameters according to real-time vibration data, and increases the damping coefficient under strong wind conditions to suppress high-frequency vibration;

[0052] When slow deformation occurs, the damping coefficient is reduced to allow the high-strength galvanized steel strand 5 to stretch flexibly and avoid hard breakage.

[0053] Therefore, this invention adopts the above-mentioned flexible connection and monitoring structure for transmission towers based on dynamic damping. It transmits dynamic loads through high-strength steel strands, utilizes helical springs, magnetorheological fluid dampers, and weather-resistant rubber sleeves to form a multi-level damping three-level energy dissipation system, and dynamically adjusts damping parameters through vibration sensors and a central controller to improve the tower's resistance to deformation and safety under different working conditions such as mining, wind vibration, and earthquakes. At the same time, the sensor data can be used to analyze the tower's condition.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the method of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the method of the present invention, and these modifications or equivalent substitutions should not cause the modified method to deviate from the spirit and scope of the method of the present invention.

Claims

1. A flexible connection and monitoring structure for transmission towers based on dynamic damping, characterized in that, It includes an adjustable ball joint anchor installed at the tower end and a universal joint connector installed at the crossarm end. The adjustable ball joint anchor and the universal joint connector are connected by high-strength galvanized steel strand. The middle of the high-strength galvanized steel strand is equipped with a multi-stage damping and shock absorption device. The universal joint connector is equipped with a displacement sensor inside and a vibration sensor is installed at the connection between the crossarm end and the universal joint connector.

2. The flexible connection and monitoring structure for transmission towers based on dynamic damping according to claim 1, characterized in that, The displacement sensor, vibration sensor, and multi-stage damping shock absorber are all connected to the central controller via electrical circuits. The accuracy of the displacement sensor is set to ±0.1mm, the monitoring frequency range of the vibration sensor is set to 0.1Hz-50Hz, and the adjustment response time of the central controller is no more than 0.1s.

3. The flexible connection and monitoring structure for transmission towers based on dynamic damping according to claim 1, characterized in that, The adjustable ball joint anchor includes a ball head base and a rotating ball head disposed inside the ball head base. The rotating ball head is equipped with a hydraulic jack. The rotation range of the rotating ball head is set to 0°-360°, and the deflection angle of the rotating ball head is set to ±5°.

4. The flexible connection and monitoring structure for transmission towers based on dynamic damping according to claim 1, characterized in that, The multi-stage damping shock absorption device includes a magnetorheological fluid damper and a weather-resistant rubber energy-dissipating sleeve disposed on the outside of the magnetorheological fluid damper. The magnetorheological fluid damper includes a cylinder and a drive device disposed on the top of the cylinder. A push rod is disposed at the bottom of the drive device.

5. The flexible connection and monitoring structure for transmission towers based on dynamic damping according to claim 4, characterized in that, The push rod is located inside the cylinder body. A helical spring is installed at the top of the push rod, a piston is installed in the middle of the push rod, an iron core is installed at the bottom of the push rod, an electromagnetic coil is installed on the outer surface of the iron core, and magnetorheological fluid is installed in the internal cavity of the cylinder body.

6. The flexible connection and monitoring structure for transmission towers based on dynamic damping according to claim 4, characterized in that, The spring constant of the helical spring is set to 50 N / mm-100 N / mm, the damping constant of the magnetorheological fluid damper is set to 0.5 N·s / mm-5 N·s / mm, the Shore hardness of the weather-resistant rubber energy-dissipating sleeve is set to 60 A, and the Shore hardness error of the weather-resistant rubber energy-dissipating sleeve is set to ±5 A.

7. The flexible connection and monitoring structure for transmission towers based on dynamic damping according to claim 1, characterized in that, The diameter range of high-strength galvanized steel strand is set at 12mm-16mm, and the breaking tensile strength of high-strength galvanized steel strand is not less than 150kN.

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