Self-adaptive anti-galloping device for galloping wire of power transmission tower

Abstract

The invention relates to a self-adaptive anti-galloping device for a galloping wire of a power transmission tower. Comprising a support fixedly connected with a cross arm, an upper hanging ring connected with a wire, a piston with the top end fixedly connected with the upper hanging ring, a spring bolt fixedly connected with the bottom end of the piston, a shell in sliding connection with the piston and a lower hanging ring fixedly connected with the shell. The shell is fixedly connected with the bracket; the lower hanging ring is fixedly connected with the insulator string; a jacking device is arranged between the spring bolt and the shell; an elastic pressing device is arranged between the piston and the shell; the device has the beneficial effects that through the arrangement of the piston, the spring bolt, the pressing device and the jacking device, the galloping energy is released, the inherent frequency of the system is reduced, the galloping amplitude is also reduced, and the tension of a wire hanging point is reduced, so that a power transmission line is protected, the probability of wire breakage is greatly reduced, and the loss caused by a power grid accident is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of conductor anti-dancing, in particular to an adaptive anti-dancing device for dancing conductors of a power transmission tower. Background Art

[0002] Transmission wires are an important part of transmission lines. As they are exposed to the atmosphere, they are easily affected by meteorological conditions such as temperature changes, strong winds, and icing. Among the large-scale vibration disasters of transmission line wires, galloping is the most serious form of disaster.

[0003] The inventor found that there are many types of anti-dancing devices now, but they only reduce the degree of dancing to a certain extent and do not completely solve the problem of power line dancing. There is still a large gap between my country and foreign countries in the design of anti-dancing devices. These gaps urge us to further explore methods for suppressing the dancing of power transmission lines. In view of the shortcomings of existing anti-dancing devices, the applicant optimized the basic structural form of the anti-dancing device, innovatively proposed a structural design adaptive anti-dancing, and provided a structural design adaptive anti-dancing for high-voltage transmission lines.

[0004] The patent application number is 201811228177.1, and its name is a patent for an anti-dance device, which discloses: side wings 3, main wings 4 and shaft 5; the main wing 4 is a concave structure, the side wings 3 are strip structures that match the concave part of the main wing 4, and the side wings 3 are placed in the concave part of the main wing 4; the two ends of the concave main wing 4 are axially connected to the side wings 3 through the shaft 5, which reduces the wind pressure on the surface of the anti-dance device, can effectively utilize wind energy, suppress the dancing of the wires, prevent damage to the wires, or cause damage such as broken wires due to excessive local stress; this scheme is a kind of hard connection, which can only reduce the wind pressure of the anti-dance device itself, and cannot fundamentally solve the problem of wire dancing, and has limitations. Summary of the invention

[0005] The purpose of the present invention is to provide an adaptive anti-dancing device for the design of a dancing conductor structure of a transmission tower, which absorbs dancing energy through an internally arranged energy-absorbing spring. The device is easy to install and can achieve an anti-dancing effect by repeated action and reset.

[0006] To solve the above problems, the present invention adopts the following technical solutions:

[0007] An adaptive anti-dancing device for dancing conductors of a transmission tower comprises a bracket fixedly connected to a cross arm, an upper hanging ring connected to the conductor, a piston fixedly connected to the upper hanging ring at the top end, a locking tongue fixedly connected to the bottom end of the piston, a shell slidably connected to the piston, and a lower hanging ring fixedly connected to the shell; the shell is fixedly connected to the bracket; the lower hanging ring is fixedly connected to an insulator string; a tightening device is provided between the locking tongue and the shell; and an elastic pressing device is provided between the piston and the shell.

[0008] Furthermore, the shell includes an upper cylinder and a lower cylinder fixedly connected to the upper cylinder; the lower hanging ring is fixedly connected to the lower cylinder.

[0009] Furthermore, the upper cylinder is provided with a first inner hole; the lower cylinder is provided with a second inner hole; the diameter of the second inner hole is smaller than the diameter of the first inner hole; the piston is provided with a flange; and the elastic clamping device presses the flange against the top end of the second inner hole.

[0010] Furthermore, the elastic clamping device includes a lock nut threadedly connected to the inner hole, a thrust ball bearing abutting the lock nut, and a spring abutting the thrust ball bearing; the spring abuts the flange; the lock nut is a hollow structure; the lock nut and the thrust ball bearing are sleeved on the piston; the piston is slidably connected to the thrust ball bearing.

[0011] Furthermore, the piston is provided with an annular groove, and the locking tongue is locked in the annular groove by a retaining spring.

[0012] Furthermore, the tightening device comprises four sets, which are evenly distributed along the circumference of the lock tongue [K1].

[0013] Furthermore, the tightening device includes a fixed cap fixedly connected to the lower cylinder, a movable cap threadedly connected to the fixed cap, a guide block fixedly connected to the movable cap, a guide rod slidably connected to the guide block, a slider fixedly connected to the guide rod, and a second spring arranged between the slider and the guide block; the second spring is sleeved on the guide rod; the end of the slider abuts against the locking tongue; the slider is slidably connected to the side wall of the lower cylinder; the slider is provided with a boss for limiting the position of the slider and the lower cylinder, and the boss abuts against the side wall of the cylinder.

[0014] Furthermore, the outer diameter of the locking tongue is larger than the inner diameter of the second inner hole.

[0015] Furthermore, the locking tongue is provided with an inclined surface, the sliding block is provided with a curved surface, and the inclined surface abuts against the curved surface.

[0016] Furthermore, the pre-tightening pressure of the spring on the flange is greater than the vertical component of the pressure applied by the second spring to the lock tongue.

[0017] The beneficial effects of the present invention are:

[0018] The action threshold of the adaptive protection device is determined by the vertical component of the contact force between the lock tongue and the piston inclined surface. Once the hanging point tension of the tension tower conductor exceeds the action threshold, the lock tongue will be pushed back into the fixed cap by the inclined surface of the piston, the piston will slide in the cylinder, and finally the lock tongue will abut against the inner hole end face of the lower cylinder, and the entire hardware will be extended; after the device is extended, due to the release of dancing energy and the reduction of the system's natural frequency, the dancing amplitude will also decrease, reducing the tension of the conductor hanging point, so that the transmission line is protected, greatly reducing the probability of wire breakage and reducing the losses caused by power grid accidents;

[0019] Through the set spring, the spring is given a certain pre-tightening force threshold through the locking nut and the thrust ball bearing. That is to say, by adjusting the position of the locking nut in the upper cylinder, the pre-tightening force threshold can be adjusted. For areas with strong winds, the locking nut is screwed down one or two more turns to increase the pre-tightening force threshold. For areas with low winds, the locking nut is screwed upward one or two turns to increase the chance of spring deformation and avoid the situation where the wind is too small to pull the spring and prevent dancing.

[0020] Through the set tightening device, the curved surface of the slider abuts against the inclined surface of the lock tongue. When the pressure of the second spring on the inclined surface of the lock tongue through the curved surface of the slider is greater than the tension of the wire dancing, the lock tongue does not move, that is, the second spring absorbs energy. When the tension of the wire dancing is greater than the inclined surface pressure of the curved surface of the slider on the lock tongue, the spring on the piston will be stressed. When the tension of the wire dancing is greater than the pre-tightening force threshold of the spring, the spring stretches, absorbs energy and reduces the vibration amplitude. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 for Figure 1 Enlarged view of point C;

[0023] Figure 3 for Figure 1 A schematic diagram of the connection between the piston and the locking tongue;

[0024] Figure 4 It is a schematic diagram of the structure of the present invention when it is working;

[0025] The numbers in the figure are

[0026] 1-upper cylinder, first inner hole 111;

[0027] 2- Bracket;

[0028] 3-Elastic clamping device;

[0029] 4-piston, 41-flange, 42-upper hanging ring;

[0030] 5-locking nut, 6-thrust ball bearing, 7-spring;

[0031] 8-lower cylinder, 81-second inner hole;

[0032] 9-fixed cap, 10-movable cap, 11-guide block, 12-guide rod, 13-second spring, 14-slider, 15-lock tongue, 16-circlip, 17-lower hanging ring. DETAILED DESCRIPTION

[0033] The following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0034] Example 1

[0035] like Figure 1 —4,

[0036] An adaptive anti-dancing device for dancing conductors of a power transmission tower, comprising a bracket 2 fixedly connected to a cross arm, an upper hanging ring 42 connected to the conductor, a piston 4 fixedly connected to the upper hanging ring 42 at the top, a locking tongue 15 fixedly connected to the bottom of the piston 4, a shell slidably connected to the piston 4, and a lower hanging ring 17 fixedly connected to the shell; the shell is fixedly connected to the bracket 2;

[0037] The lower hanging ring 17 is fixedly connected to the insulator string;

[0038] A tightening device is provided between the locking tongue 15 and the housing; the locking tongue 15 is subjected to pressure by the tightening device to prevent free sliding.

[0039] An elastic pressing device 3 is provided between the piston 4 and the housing. The pressure of the elastic pressing device 3 can be adjusted, and the elastic pressing force can be adjusted according to the local average wind speed to adapt to the conductor dancing in most areas.

[0040] like Figure 1-2 As shown, the shell includes an upper cylinder 2 and a lower cylinder 8 fixedly connected to the upper cylinder 2 by threads; the lower hanging ring 17 is fixedly connected to the lower cylinder 8 by threads.

[0041] The upper cylinder 2 is provided with a first inner hole 111; the lower cylinder 8 is provided with a second inner hole 81; the diameter of the second inner hole 81 is smaller than the diameter of the first inner hole 111; the piston 4 is provided with a flange 41;

[0042] The outer diameter of the flange 41 is larger than the diameter of the second inner hole 81, so that the piston 4 can overlap the side wall of the second inner hole 81 through the flange 41; it is convenient for the elastic clamping device 3 to apply a pre-tightening force when clamping, that is, to pre-store a certain amount of energy to absorb the energy of the wire dancing.

[0043] The elastic pressing device 3 presses the flange 41 against the side wall at the top end of the second inner hole 81 .

[0044] like Figure 1 As shown, the elastic pressing device 3 includes a lock nut 5 threadedly connected to the first inner hole 111, a thrust ball bearing 6 abutting against the lock nut 5, and a spring 7 abutting against the thrust ball bearing 6;

[0045] The spring 7 abuts against the flange 41;

[0046] The lock nut 5 is a hollow structure;

[0047] The lock nut 5 and the thrust ball bearing 6 are sleeved on the piston 4; the piston 4 is slidably connected to the inner hole of the thrust ball bearing 6.

[0048] The thrust ball bearing 6 is provided because when the wire dances, the piston 4 will not only be subjected to vertical force, but also to lateral force, so that the piston 4 can rotate in the hole of the thrust ball bearing 6 to prevent the piston 6 from being subjected to too much lateral force, causing deformation and affecting the elongation of the piston 4.

[0049] The depth to which the locking nut 5 is screwed into the upper cylinder 1 determines the preload force of the spring 7. The deeper it is screwed, the greater the pressure on the spring 7, and thus the critical point of the tension for absorbing the dancing of the wire, that is, the later the device deforms, and the greater the action threshold. The distance between the locking nut 5 and the flange 41 should be appropriate. Generally, in areas with strong winds, the spring 7 is compressed more, and in areas with weak winds, the spring 7 is compressed less, so as to absorb the tension when dancing.

[0050] The piston 4 is provided with an annular groove, and the locking tongue 14 is locked in the annular groove by a retaining spring 16 .

[0051] The tightening device is four sets, which are evenly distributed along the circumferential direction of the lock tongue 14. This arrangement can make the lock tongue 14 evenly stressed and avoid deformation of the lock tongue 14 due to single-sided stress.

[0052] The tightening device includes a fixed cap 9 fixedly connected to the lower cylinder 8, a movable cap 10 threadedly connected to the fixed cap 9, a guide block 11 fixedly connected to the movable cap 10, a guide rod 12 slidably connected to the guide block 11, a slider 14 fixedly connected to the guide rod 12, and a second spring 13 provided between the slider 14 and the guide block 11;

[0053] The second spring 13 is sleeved on the guide rod 12;

[0054] The end of the slider 14 abuts against the locking tongue 15;

[0055] The slider 14 is provided with a boss for limiting the position of the slider 14 and the lower cylinder 8;

[0056] In the normal state, under the action of the second spring 13, the boss abuts against the side wall of the lower cylinder 8; when the tension of the dancing wire is greater than the sum of the preload force of the spring 7 and the vertical component of the pressure applied by the curved surface of the slider 14 to the inclined surface of the locking tongue 15, the boss detaches from the side wall of the lower cylinder 8.

[0057] The slide block 14 is slidably connected to the side wall of the lower cylinder 8 ; the axis of the guide rod 12 is perpendicular to the axis of the piston 4 .

[0058] The outer diameter of the locking tongue 15 is larger than the inner diameter of the second inner hole 81 to avoid excessive tension when the wire dances in an extreme state, and the flange 41 of the piston 4 applies a pressure exceeding its allowable value on the spring 7, causing elastic failure and ineffectiveness.

[0059] The locking tongue 15 is provided with an inclined surface, and the sliding block 14 is provided with a curved surface, and the inclined surface abuts against the curved surface.

[0060] The pre-tightening pressure of the spring 7 on the flange 41 is greater than the vertical component of the pressure applied by the second spring 13 to the locking tongue 15 .

[0061] The use and working process of the present invention,

[0062] The action threshold is determined by the vertical component of the contact force between the locking tongue 15 and the inclined surface of the slider 14, so before the action, the locking tongue 15 and the slider 14 are kept stable to bear most of the tension of the hanging point.

[0063] Once the tension of the hanging point of the tension tower conductor exceeds the action threshold, the lock tongue 15 will be pushed back into the movable cap 9 by the inclined surface of the slider 14, the slider 14 will retract into the lower sleeve 8, and the lock tongue 15 will slide upward to the braking surface of the lower sleeve 1, so that the entire hardware is extended;

[0064] After extending the device, the dancing amplitude will decrease due to the release of dancing energy and the reduction of the system's natural frequency, thereby reducing the tension at the wire hanging point.

[0065] like Figure 4 As shown, when the wire dancing amplitude increases, the wire hanging point tension also increases continuously. Once the hanging point tension reaches the threshold set by the anti-dancing device, the trigger piston 4 automatically extends to overcome the resistance of the spring 7, thereby changing the wire tension and reducing the wire's natural frequency. At the same time, the dancing energy is released, thereby suppressing the wire dancing.

[0066] Example 2

[0067] The structure of this embodiment is basically the same as that of embodiment 1.

[0068] The difference between this embodiment and embodiment 1 is that:

[0069] like Figure 1 As shown, a flange is fixedly provided on the top outer wall of the upper cylinder 1, and the bracket 2 is connected to the flange by bolts and nuts, and then fixed on the cross arm. Due to the flange connection, it is easy to disassemble and use.

[0070] Example 3

[0071] The structure of this embodiment is basically the same as that of embodiment 1.

[0072] The difference between this embodiment and embodiment 1 is that:

[0073] like Figure 2 As shown, the movable cap 10 is screwed into the fixed cap 9. By tightening the movable cap 10, pressure can be applied to the second spring 13. The pressure is adjusted according to the local average wind force. For example, in Zhangbei area where the wind force is relatively strong, the movable cap 10 is screwed in a greater distance, while in the plain area of ​​Hebei, the movable cap 10 is screwed in a smaller distance. Since the movable cap 10 and the fixed cap 9 are threadedly connected, there is a risk of vibration loosening after adjusting the screw-in distance of the movable cap 10. Therefore, a locking screw is provided on the side wall of the fixed cap 9. After the preload force is adjusted, the locking screw is tightened to prevent the movable cap 10 from loosening and affecting the threshold of the action of the device.

[0074] The above description of the disclosed embodiments enables professionals in the field to implement or use the present invention. Various modifications to these embodiments will be obvious to professionals in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. The above description is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and improved concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0075] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. An adaptive anti-dancing device for dancing conductors of transmission towers, characterized in that: It comprises a bracket (2) fixedly connected to a cross arm, an upper hanging ring (42) connected to a conductor, a piston (4) whose top end is fixedly connected to the upper hanging ring (42), a locking tongue (15) fixedly connected to the bottom end of the piston (4), a shell slidably connected to the piston (4), and a lower hanging ring (17) fixedly connected to the shell; the shell is fixedly connected to the bracket (2); the lower hanging ring (17) is fixedly connected to an insulator string; a tightening device is provided between the locking tongue (15) and the shell; and an elastic pressing device (3) is provided between the piston (4) and the shell.

2. The device for adaptively preventing dancing conductors of power transmission towers according to claim 1 is characterized in that: The shell comprises an upper cylinder (2) and a lower cylinder (8) fixedly connected to the upper cylinder (2); the lower hanging ring (17) is fixedly connected to the lower cylinder (8).

3. The device for adaptively preventing dancing conductors of power transmission towers according to claim 2 is characterized in that: The upper cylinder (2) is provided with a first inner hole (111); the lower cylinder (8) is provided with a second inner hole (81); the diameter of the second inner hole (81) is smaller than the diameter of the first inner hole (111); the piston (4) is provided with a flange (41); the outer diameter of the flange (41) is larger than the diameter of the second inner hole (81); The elastic pressing device presses the flange (41) against the top end of the second inner hole (81).

4. The device for adaptively preventing dancing conductors of power transmission towers according to claim 3 is characterized in that: The elastic clamping device (3) comprises a lock nut (5) threadedly connected to the first inner hole (111), a thrust ball bearing (6) abutting against the lock nut (5), and a spring (7) abutting against the thrust ball bearing (6); the spring (7) abuts against the flange (41); the lock nut (5) is a hollow structure; the lock nut (5) and the thrust ball bearing (6) are sleeved on the piston (4); the piston (4) is slidably connected to the thrust ball bearing (6); the lock nut (5) applies a preload to the spring (7) between the thrust ball bearing (6) and the flange (41).

5. The device for adaptively preventing dancing conductors of power transmission towers according to claim 4 is characterized in that: The piston (4) is provided with an annular groove, and the locking tongue (14) is locked in the annular groove by a retaining spring (16).

6. The device for adaptively preventing dancing conductors of power transmission towers according to claim 5, characterized in that: The tightening devices are four sets, which are evenly distributed along the circumference of the locking tongue (14).

7. The device for adaptively preventing dancing conductors of a transmission tower according to claim 6, characterized in that: The tightening device comprises a fixed cap (9) fixedly connected to the lower cylinder (8), a movable cap (10) threadedly connected to the fixed cap (9), a guide block (11) fixedly connected to the movable cap (10), a guide rod (12) slidably connected to the guide block (11), a slider (14) fixedly connected to the guide rod (12), and a second spring (13) arranged between the slider (14) and the guide block (11); the second spring (13) is sleeved on the guide rod (12); the end of the slider (14) abuts against the locking tongue (15); the slider (14) is provided with a boss for limiting the slider (14) and the lower cylinder (8), the boss abuts against the side wall of the lower cylinder (8); the slider (14) is slidably connected to the side wall of the lower cylinder (8); the axis of the guide rod (12) is perpendicular to the axis of the piston (4).

8. The device for adaptively preventing dancing conductors of power transmission towers according to claim 7, characterized in that: The outer diameter of the locking tongue (15) is greater than the inner diameter of the second inner hole (81).

9. The device for adaptively preventing dancing conductors of a transmission tower according to claim 8, characterized in that: The locking tongue (15) is provided with an inclined surface, the sliding block (14) is provided with a curved surface, and the inclined surface abuts against the curved surface.

10. The device for adaptively preventing dancing conductors of power transmission towers according to claim 1, characterized in that: The pre-tightening pressure of the spring (7) on the flange (41) is greater than the vertical component of the pressure applied by the second spring (13) to the lock tongue (15) through the slider (14).

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