Adjustable positive feeder anti-galloping device and method thereof

Abstract

The invention discloses an adjustable positive feeder anti-galloping device and method, belongs to the technical field of railway contact networks, and solves the problem that an existing positive feeder is prone to galloping. The device comprises a device body which comprises an insulator, one end of the insulator is fixedly connected with a positive feeder line, and the other end of the insulator is fixedly connected with an elastic damper; the steel cable length adjusting assembly comprises a steel cable with the adjustable length, and the movable end of the steel cable is fixedly connected with the elastic damper; and the control assembly comprises an upper computer, an environment sensor and a tension sensor used for detecting the tension of the positive feeder line. An elastic damper and a steel rope length adjusting assembly are combined to form tension closed-loop control, an anti-galloping protection system with real-time monitoring, dynamic adjusting and impact buffering capabilities is constructed, the closed-loop control capability enables the device to automatically adjust tension according to real-time data, passive anti-galloping is upgraded to active anti-galloping, and the anti-galloping protection system has the advantages of being simple in structure, convenient to operate and high in practicability. And the overall safety and the operation efficiency of the high-speed rail overhead line system are improved.

Description

Technical Field

[0001] This invention relates to the field of railway catenary technology, specifically to an adjustable positive feeder anti-galling device and method. Background Technology

[0002] The overhead contact line feeder serves as a crucial channel for transmitting electrical energy from the substation to the overhead contact system, providing a continuous and stable power source for trains. In recent years, extreme weather events have become increasingly frequent globally, leading to a rise in overhead contact line safety accidents caused by severe weather. Particularly during winter and early spring, prolonged periods of low temperatures and snow can easily cause icing on the overhead contact line. Icing transforms the cross-section of the positive feeder from a circular shape to an irregular one, making it susceptible to aerodynamic instability under wind loads, potentially causing conductor galloping and seriously threatening traction power supply safety. Summary of the Invention

[0003] To address the aforementioned shortcomings of existing technologies, this invention provides an adjustable positive feeder anti-galling device and method, which solves the problem of easy galling of existing positive feeders.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0005] On one hand, an adjustable positive feeder anti-galling device is provided, comprising: a device body, which includes an insulator, one end of which is fixedly connected to the positive feeder and the other end of which is fixedly connected to an elastic damper; a steel cable length adjustment assembly, which includes an adjustable steel cable, the movable end of which is fixedly connected to the elastic damper; and a control assembly, which includes a host computer, an environmental sensor, and a tension sensor for detecting the tension of the positive feeder, wherein the host computer is electrically connected to the environmental sensor, the tension sensor, and the steel cable length adjustment assembly.

[0006] Furthermore, the two ends of the insulator are fixedly connected to a bolt-type clamp and an elastic damper respectively by a fixing steel cable, and the bolt-type clamp is fixedly connected to the positive feeder.

[0007] Furthermore, the cable length adjustment assembly also includes a winch for adjusting the length of the cable, and the motor in the winch is electrically connected to the host computer.

[0008] Furthermore, the cable length adjustment assembly also includes a fixing seat with lugs for the cable to pass through.

[0009] On the other hand, a method for providing an adjustable positive feeder anti-glamping device includes the following steps:

[0010] S1. The tension of the positive feed line is obtained through a tension sensor and an environmental sensor, respectively. And environmental parameters, including wind speed ,temperature and relative humidity ;

[0011] S2, based on temperature and relative humidity Calculate the icing determination factor and based on and wind speed Calculate the icing thickness of the positive feeder Utilizing ice thickness Calculate the equivalent diameter of the positive feeder and mass per unit length and based on , , Calculate the minimum tension value required to suppress positive feeder galloping. At the same time, the maximum tension of the positive feeder design was calculated. ;

[0012] S3, based on wind speed Icing determination factor Calculate the shrinkage coefficient and based on , and To obtain the optimal tension range for the positive feeder;

[0013] S4. Adjusting tension by changing the length of the steel cable. Within the optimal tension range.

[0014] Furthermore, icing determination factors .

[0015] Furthermore, the equivalent diameter Ice thickness and mass per unit length The calculation expressions are as follows:

[0016] ; ;

[0017] in, and These are the initial diameter and initial unit mass of the positive feed line, respectively; The density of ice; This represents the icing weighting coefficient.

[0018] Furthermore, and The calculation expressions are as follows:

[0019] ;

[0020] Where |H| is the negative aerodynamic damping strength parameter; ζ is the equivalent damping ratio of the positive feeder; The positive feeder is designed to withstand stress. This is the safety factor for the strength of the positive feeder; For span.

[0021] Furthermore, the shrinkage coefficient The calculation is expressed as:

[0022] ;

[0023] in, and These are the wind speed weighting coefficient and the icing weighting coefficient, respectively. and These are the preset minimum shrinkage coefficient and the preset maximum shrinkage coefficient, respectively.

[0024] Furthermore, the optimal tension range is , and The expressions are as follows:

[0025] ;

[0026] in, and These are the lower and upper limits for optimal tension control, respectively.

[0027] Compared with the prior art, the present invention has the following significant advantages:

[0028] 1. A tension closed-loop control system is formed by combining elastic dampers with cable length adjustment components, constructing an anti-galloping protection system with real-time monitoring, dynamic adjustment, and impact buffering capabilities. The closed-loop control capability allows the device to automatically adjust the tension based on real-time data, upgrading from "passive anti-galloping" to "active galloping suppression," thus improving the overall safety and operational efficiency of the high-speed railway catenary system. This device collects axial tension data of the feeder in real time at millisecond frequencies through tension sensors directly deployed on the positive feeder, and integrates environmental sensors for parameters such as wind speed, temperature, and humidity to form the system's sensing layer. The acquired multi-source real-time data (tension, wind speed, temperature, and humidity) is synchronously transmitted to the host computer, providing accurate and reliable input for subsequent algorithm-based intelligent tension judgment and dynamic adjustment control. Furthermore, elastic dampers are installed at the bottom of the insulators and the connection points of the steel cables. When the positive feeder experiences sudden and severe galloping under conditions such as strong winds or ice shedding, the elastic damper can rapidly dissipate vibration energy using its nonlinear mechanical properties, effectively limiting amplitude growth and reducing impact loads. This prevents transient dynamic tension peaks from adversely affecting the device structure and the overhead contact system. The synergistic effect of the tension sensor and the elastic damper enables this anti-galloping device to not only achieve precise static control of feeder tension but also possess excellent dynamic buffering and impact absorption capabilities. This significantly improves the overall protection reliability of the overhead contact system under extreme weather conditions, providing dual protection for the safe and stable operation of the high-speed railway traction power supply system.

[0029] 2. By tightening the bolts of the bolt-type wire clamp, a strong clamping force is generated, which makes the clamp body of the bolt-type wire clamp tightly press against the positive feed line. The serrated pattern designed on the clamping surface effectively increases the friction and engagement depth, thereby forming a reliable mechanical gripping force, which is sufficient to resist wire displacement and prevent slippage.

[0030] 3. The motor-driven winch enables the adjustment of the steel cable length, making tension control more precise and automated, avoiding errors caused by manual intervention, and improving response speed and control stability.

[0031] 4. The fixing seat guides the steel cable through the lugs, effectively dispersing the impact force generated by wind load and galloping, preventing stress concentration, and enhancing the fatigue resistance and anchoring reliability of the device.

[0032] 5. By acquiring parameters such as tension, wind speed, temperature, and humidity through sensor data, and calculating icing parameters and optimal tension range for the positive feeder based on these parameters, the scientific rigor and adaptability of the blasting suppression strategy are improved. Simultaneously, quantifying icing risk based on temperature and relative humidity enables the system to accurately assess the intensity of icing development. Furthermore, considering the impact of environmental parameters on tension allows the control strategy to respond to climate changes in real time, preventing over- or under-adjustment and ensuring the stable operation of the positive feeder under extreme weather conditions.

[0033] 6. Considering that the tension drop is difficult to predict accurately during the forward and reverse rotation of the motor due to factors such as mechanism clearance, friction and inertia, a contraction coefficient is introduced to narrow the tension control range in order to improve the stability of closed-loop control and reduce the risk of overshoot. This reduces overshoot and oscillation during motor adjustment and improves the smoothness and reliability of closed-loop control. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the adjustable positive feeder anti-glamping device.

[0035] Figure 2 A schematic diagram of the tension adjustment method for an adjustable positive feeder anti-galling device;

[0036] The components include: 1. Bolt-type clamp; 2. Positive feeder; 3. Bolt; 4. Insulator; 5. Tension sensor; 6. Elastic damper; 7. Hanging lug; 8. Expansion bolt; 9. Fixing base; 10. Winch; 11. Motor; 12. Host computer; 13. Environmental sensor. Detailed Implementation

[0037] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0038] Existing catenary feeders are prone to galloping in severe weather conditions such as wind and snow. To address this issue, patent CN112886515B discloses a test device and anti-galloping effect detection system for transmission lines, comprising a scaled-down conductor model, a conductor fixing device, an anti-galloping damper, a tension sensor, and a damper fixing device. This device installs an anti-galloping damper at the end of the conductor model, generating damping force by cutting magnetic field lines with a conductor copper plate, thus reducing vibration of the conductor model. While it can quickly and easily change the damping coefficient of the damper and obtain real-time tension data of the conductor model through tension sensors, tension sensors, dynamic strain gauges, and computers, it cannot determine the range of tension suppression for different environments, lacking adaptability to various conditions and failing to guarantee long-term stable operation of the catenary. This embodiment, to address the problem of easy galloping of existing feeders and to ensure long-term stable operation of the catenary, provides an adjustable feeder anti-galloping device, comprising a main body, a cable length adjustment component, and a control component. (Refer to...) Figure 1 .

[0039] The main body of the device includes an insulator 4. The two ends of the insulator 4 are fixedly connected to a bolt-type clamp 1 and an elastic damper 6 respectively by a fixed steel cable. The bolt-type clamp 1 is fixedly connected to the positive feeder 2.

[0040] In this embodiment, insulator 4 is designed and manufactured in strict accordance with the relevant technical standards for electrified railway contact networks. Its structure consists of three parts: a core rod made of epoxy glass fiber ductile rods serves as the core load-bearing component, providing extremely high mechanical tensile strength to withstand all the adjustment tension from the positive feeder 2; a high-temperature vulcanized silicone rubber shed and sheath are integrally injection molded on the outside of the core rod. This material has excellent hydrophobicity and arc resistance, ensuring reliable electrical insulation performance even under harsh weather conditions such as rain, snow, humidity, and environmental pollution, isolating the energized positive feeder 2 (up to 27.5kV) from the grounding base; the metal ends of insulator 4 are reliably connected to the upper and lower fixing cables via hanging rings, thereby achieving efficient transmission of mechanical tension. This structural design ensures that insulator 4 can stably perform its dual core functions of electrical isolation and mechanical connection in complex outdoor environments.

[0041] In this implementation, the bolt-type clamp 1 is made of high-strength copper-tin alloy to ensure excellent mechanical strength and corrosion resistance; its bolt 3 and nut are made of high-strength rust-proof materials such as hot-dip galvanized steel. By tightening the bolt 3, a strong clamping force is generated, and the clamp body of the bolt-type clamp 1 tightly presses against the positive feed line 2. The serrated pattern designed on the clamping surface of the clamp body effectively increases friction and engagement depth, thereby forming a reliable mechanical gripping force sufficient to resist conductor displacement and prevent slippage.

[0042] The cable length adjustment assembly includes a winch 10, which is used to adjust the length of the cable on the device. The moving end of the cable is fixedly connected to an elastic damper 6. The cable length adjustment assembly also includes a fixing seat 9, on which a lug 7 is provided for the cable to pass through.

[0043] In this embodiment, both the steel cable and the fixing cable use galvanized steel strands with a 1×19 structure. This structure is made of multiple high-strength steel wires tightly twisted concentrically, possessing both excellent flexibility and extremely high tensile strength, enabling efficient transmission of the adjusting tension applied to suppress galloping. Regarding materials and protection, the steel wire body of the cable is made of high-quality high-carbon steel, and a robust anti-corrosion layer is formed on its surface through a hot-dip galvanizing process, providing excellent weather resistance and corrosion resistance to withstand harsh environments such as wind, frost, rain, and snow along the railway line. To ensure the reliability and durability of the connection with the bolt-type clamp 1, insulator 4, and fixing seat 9, galvanized steel pull rings are crimped at both ends of the steel cable. The internal parts are cold-pressed for deformation and engagement, while the external thread design facilitates precise engagement with the adjusting hardware. This allows for precise control of the tension applied to the positive feeder 2 by fine-tuning the fixing cable connected to the positive feeder 2 or by significantly adjusting the steel cable connected to the fixing seat 9. This is the key to achieving the adjustable anti-galoping function of the device.

[0044] In this embodiment, the mounting base 9 is welded from low-alloy high-strength structural steel, possessing excellent load-bearing capacity and structural stability. To ensure reliability for long-term outdoor use, the mounting base 9 undergoes a systematic heavy-duty anti-corrosion treatment: first, sandblasting removes rust to achieve the necessary surface cleanliness; then, hot-dip galvanizing or arc spraying zinc-aluminum alloy processes form a long-lasting anti-corrosion underlayer; finally, a UV-resistant and aging-resistant outdoor thick-film epoxy topcoat is applied, thus forming a multi-layered protection system to ensure its durability in harsh environments such as humidity, salt spray, and chemical pollution. For installation, the mounting base 9 is fixed using a set of high-strength alloy steel expansion bolts 8. The bolt set adopts a symmetrical distribution design, reliably transferring the tensile and horizontal shear forces borne by the device to the pre-cast concrete foundation. This installation scheme effectively ensures the anchoring reliability of the mounting base 9 under long-term wind vibration, fatigue loads, and extreme weather conditions, providing a stable support foundation for the upper anti-swing structure.

[0045] The control components include a host computer 12, an environmental sensor 13, and a tension sensor 5 for detecting the tension of the positive feeder 2. The host computer 12 is electrically connected to the environmental sensor 13, the tension sensor 5, and the motor 11 in the winch 10. The tension sensor 5 is located at the connection between the positive feeder 2 and the contact wire.

[0046] As a further embodiment, this embodiment provides a method for an adjustable positive feeder anti-galling device, including the following steps:

[0047] S1. The tension of the positive feed line is obtained by tension sensor 13 and environmental sensor 5 respectively. And environmental parameters, including wind speed ,temperature and relative humidity , The range is 0 to 1.

[0048] S2, based on temperature and relative humidity Calculate the icing determination factor and based on and wind speed Calculate the icing thickness of the positive feeder. Utilizing ice thickness Calculate the equivalent diameter of the positive feeder and mass per unit length and based on , , Calculate the minimum tension value required to suppress positive feeder galloping. At the same time, the maximum tension of the positive feeder design was calculated. .

[0049] Icing determination factor The expression is: Icing determination factor Dimensionless, used to characterize the relative weights of the probability of icing occurring on positive feeder 2 and the intensity of icing development.

[0050] equivalent diameter Ice thickness and mass per unit length The calculation expressions are as follows:

[0051] ; ;

[0052] in, and These are the initial diameter and initial unit mass of the positive feed line, respectively; The density of ice; This represents the icing weighting coefficient.

[0053] and The calculation expressions are as follows:

[0054] ;

[0055] Where |H| is the negative aerodynamic damping strength parameter (related to the derivative of the aerodynamic coefficient of the positive feeder); ζ is the equivalent damping ratio of the positive feeder; The positive feeder is designed to withstand stress. The positive feeder strength safety factor (related to conductor type, service life, etc.); For span.

[0056] S3, based on wind speed Icing determination factor Calculate the shrinkage coefficient and based on , and To obtain the optimal tension range and shrinkage coefficient of the positive feed line The calculation is expressed as:

[0057] ;

[0058] in, and These are the wind speed weighting coefficient and the icing weighting coefficient, respectively. (This is related to the maximum wind speed and icing conditions in the area). and These are the preset minimum shrinkage coefficient and the preset maximum shrinkage coefficient, respectively.

[0059] The optimal tension range is , and The expressions are as follows:

[0060] ;

[0061] in, and These are the lower and upper limits for optimal tension control, respectively.

[0062] In this embodiment, considering that the forward and reverse rotation of the motor 11 is affected by factors such as mechanism clearance, friction and inertia, the amount of tension drop is difficult to predict accurately. In order to improve the stability of closed-loop control and reduce the risk of overshoot, a contraction coefficient is introduced to contract the tension control range, thereby reducing overshoot and oscillation during the adjustment process of the motor 11 and improving the smoothness and reliability of closed-loop control.

[0063] S4. Adjusting tension by changing the length of the steel cable. Within the optimal tension range.

[0064] refer to Figure 2 The adjustment method is as follows: when When the positive feeder tension is determined to be within the optimal control range, the current state of the steel cable is maintained; when When insufficient tension is detected, the host computer 12 controls the drive motor 11 to rotate forward, increasing the tension of the positive feeder by contracting the steel cable until the tension is within the optimal range, thereby enhancing anti-galloping capability and suppressing galloping; when If the tension is too high, the host computer 12 controls the motor 11 to reverse and release the steel cable to reduce the tension of the feeder until the tension is within the optimal tension range, thereby avoiding overload damage to the feeder and the mounting bracket.

[0065] In summary, this solution constructs an adaptive anti-galloping system integrating intelligent sensing, algorithmic decision-making, dynamic adjustment, and buffer protection, realizing a transformation from traditional "passive fixed anti-galloping" to "active and precise galloping suppression." Its fundamental advantage lies in the fusion of structural adjustability and intelligent state sensing: on the one hand, the device adjusts the length of the steel cable via motor 11, directly changing the constraint tension on the positive feeder 2, achieving controllable and adjustable tension; on the other hand, the host computer 12, based on real-time wind speed, temperature, icing thickness, and other multi-source environmental parameters, combined with online feedback from the high-precision tension sensor 5, dynamically calculates and tracks the optimal galloping suppression tension through a built-in algorithm, achieving adaptive control. Furthermore, the series-connected elastic damper 6 is specifically designed to efficiently dissipate the impact energy of sudden galloping and suppress amplitude, while high-strength, corrosion-resistant materials and reliable anchoring design ensure long-term environmental adaptability. Through the synergistic effects of known status, evidence-based decision-making, precise adjustment, effective buffering, and reliable connection, this system forms a closed-loop active suppression of ice-covered positive feeder galloping, which can improve the operational safety and long-term reliability of the high-speed rail traction power supply system under extreme weather conditions.

Claims

1. An adjustable positive feeder anti-galling device, characterized in that, include: The main body of the device includes an insulator (4), one end of which is fixedly connected to the positive feed line (2) and the other end is fixedly connected to the elastic damper (6); A steel cable length adjustment assembly includes a steel cable with adjustable length, the movable end of which is fixedly connected to the elastic damper (6). The control component includes a host computer (12), an environmental sensor (13), and a tension sensor (5) for detecting the tension of the positive feeder (2), wherein the host computer (12) is electrically connected to the environmental sensor (13), the tension sensor (5), and the cable length adjustment component.

2. The adjustable positive feeder anti-galling device according to claim 1, characterized in that, The two ends of the insulator (4) are fixedly connected to the bolt-type clamp (1) and the elastic damper (6) respectively by a fixed steel cable. The bolt-type clamp (1) is fixedly connected to the positive feeder (2).

3. The adjustable positive feeder anti-galling device according to claim 1, characterized in that, The cable length adjustment assembly also includes a winch (10) for adjusting the length of the cable, wherein the motor (11) in the winch (10) is electrically connected to the host computer (12).

4. The adjustable positive feeder anti-galling device according to claim 1, characterized in that, The cable length adjustment assembly also includes a fixing seat (9), on which a lug (7) is provided for the cable to pass through.

5. The method for the adjustable positive feeder anti-galling device according to any one of claims 1 to 4, characterized in that, Including the following steps: S1. The tension of the positive feed line is obtained by the tension sensor (5) and the environmental sensor (13) respectively. And environmental parameters, including wind speed ,temperature and relative humidity ; S2, based on temperature and relative humidity Calculate the icing determination factor and based on and wind speed Calculate the icing thickness of the positive feeder Utilizing ice thickness Calculate the equivalent diameter of the positive feeder and mass per unit length and based on , , Calculate the minimum tension value required to suppress positive feeder galloping. Simultaneously calculate the maximum tension of the positive feeder design. ; S3, based on wind speed Icing determination factor Calculate the shrinkage coefficient and based on , and To obtain the optimal tension range for the positive feeder; S4. Adjusting tension by changing the length of the steel cable. Within the optimal tension range.

6. The method for the adjustable positive feeder anti-galling device according to claim 5, characterized in that, Icing determination factor .

7. The method for the adjustable positive feeder anti-galling device according to claim 5, characterized in that, equivalent diameter Ice thickness and mass per unit length The calculation expressions are as follows: ； ； in, and These are the initial diameter and initial unit mass of the positive feed line, respectively; Density of ice; This represents the icing weighting coefficient.

8. The method for the adjustable positive feeder anti-galling device according to claim 5, characterized in that, and The calculation expressions are as follows: ； Where |H| is the negative aerodynamic damping strength parameter; ζ is the equivalent damping ratio of the positive feeder; The positive feeder is designed to withstand stress. This is the safety factor for the strength of the positive feeder; For span.

9. The method for the adjustable positive feeder anti-galling device according to claim 8, characterized in that, Shrinkage coefficient The calculation is expressed as: ； in, and These are the wind speed weighting coefficient and the icing weighting coefficient, respectively. and These are the preset minimum shrinkage coefficient and the preset maximum shrinkage coefficient, respectively.

10. The method for the adjustable positive feeder anti-galling device according to claim 9, characterized in that, The optimal tension range is , and The expressions are as follows: ； in, and These are the lower and upper limits for optimal tension control, respectively.

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