Energy recovery electric tensioner for overhead lines and method

Abstract

The application discloses an energy recovery type electric tensioner for an overhead line and a method, relates to the technical field of overhead power transmission line construction equipment, and comprises a tension control mechanism arranged on a rack; the tension control mechanism comprises a mounting rack, a first driving mechanism and a fine adjustment mechanism; wherein the mounting rack is slidingly connected to the rack, and a cable is tensioned on the mounting rack; the first driving mechanism is installed on the rack and is used for driving the mounting rack to slide on the rack so as to control the tension of the cable; and the fine adjustment mechanism is installed on the mounting rack and is used for controlling the tensioning distance between the cable and the mounting rack. Through the first driving mechanism and the fine adjustment mechanism, the precision of coarse adjustment and fine adjustment is superposed, a pure mechanical tension control chain is adopted, the tension measurement error in a magnetic field is reduced, and the tension control precision is improved; and a double-stage control system is formed through the first driving mechanism and the fine adjustment mechanism, so that the tension adjustment range is ensured.

Description

Technical Field

[0001] This invention relates to the field of overhead transmission line construction equipment technology, specifically to an energy recovery type electric tensioner and method for overhead lines. Background Technology

[0002] An overhead transmission line tensioner is a mechanical device specifically used for tensioning conductors during transmission line construction, typically in conjunction with a traction machine. The traction machine is responsible for the initial pulling of the conductor, while the tensioner continuously provides and adjusts the required tension after the conductor is unfurled to ensure the stability and safety of the conductor laying. Most existing electric tensioners are equipped with energy recovery mechanisms to recover energy; however, these energy-recovery electric tensioners require high precision in tension control during operation.

[0003] For example, Chinese Patent CN118249252A discloses an electric tensioner for overhead transmission lines, including a frame, a wheel assembly mounted on the frame for conveying conductors, a power generation unit that generates electricity using the rotational motion of the wheel assembly, and a battery pack for storing electrical energy. By utilizing the resistance during power generation to provide tension for conductor traction, it facilitates partial recovery of the energy consumed by the traction machine, thereby avoiding energy loss when the tensioner itself provides tension to the conductors, realizing resource recycling and reuse, improving the overall energy efficiency of the operation. At the same time, it eliminates the complex hydraulic system and adopts an electric drive method, which not only simplifies the mechanical structure of the equipment but also reduces the overall weight, facilitating on-site disassembly and transportation, and improving the flexibility and efficiency of construction.

[0004] The aforementioned energy recovery electric tension machine has extremely high requirements for tension control accuracy. If the tension control accuracy is insufficient, it will lead to tension instability, which in turn will cause fluctuations in the motor's power generation, reduce energy recovery efficiency, and may also bring safety hazards. Furthermore, existing tension sensors are susceptible to common-mode interference of ±5%FS (full scale of the measuring device) in strong electromagnetic environments (such as near live lines). Once interfered with, the sensor output may exceed the overload threshold, causing the tension machine to brake erroneously.

[0005] Especially in environments with large temperature variations, sensors are more prone to failure, which can directly lead to wire slippage or hardware damage. This not only affects the quality of construction but may also pose a serious threat to the efficiency and safety of energy recovery. Summary of the Invention

[0006] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide an energy recovery electric tensioner and method for overhead lines, so as to solve the problem of low tension control accuracy of existing energy recovery electric tensioners mentioned in the background art.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] An energy-recovery electric tensioner for overhead power lines includes a tension control mechanism mounted on a frame. The tension control mechanism includes a mounting frame, a first drive mechanism, and a fine-tuning mechanism. The mounting frame is slidably connected to the frame, and the cable is tensioned on the mounting frame. The first drive mechanism is mounted on the frame and is used to drive the mounting frame to slide on the frame to control the cable tension. The fine-tuning mechanism is mounted on the mounting frame and is used to control the tension distance between the cable and the mounting frame.

[0009] Preferably, the first driving mechanism includes a first motor, a second screw, and a pair of second sliders; the frame is provided with a sliding groove, the pair of second sliders are fixed to the mounting frame and slidably connected to the sliding groove, the first motor is mounted on the frame, the output end of the first motor is coaxially connected to the second screw, and one of the second sliders is threadedly connected to the second screw.

[0010] Preferably, the fine-tuning mechanism includes a universal ball, a housing, a second drive mechanism, and multiple guide shafts; the universal ball is sleeved on the cable, the multiple guide shafts are fixed to the mounting frame, the housing is slidably connected to the guide shafts, and the universal ball is disposed inside the housing; the second drive mechanism is mounted on the mounting frame and is used to drive the housing to move along the axis of the guide shafts.

[0011] Preferably, the second drive mechanism includes a second motor, a worm, a worm wheel, and a first screw; the second motor is mounted on a mounting frame, the output end of the second motor is coaxially connected to the worm, the worm wheel is rotatably connected to the mounting frame around its axis, and the worm and the worm wheel mesh with each other; the first screw is fixed to the housing, and the worm wheel is threaded onto the first screw.

[0012] Preferably, the fine-tuning mechanism further includes an overload protection mechanism, which includes a first cam, a first spring, a connecting shaft, a second cam, a sliding sleeve, and a first slider. The connecting shaft is coaxially connected between the worm gear and the output end of the second drive mechanism. The first cam is fixed to the connecting shaft, and the second cam is coaxially sleeved on the output shaft of the second motor, with the first cam and the second cam abutting against each other. The second cam and the output shaft of the second motor are connected by the first spring. The overload protection mechanism is sleeved on the connecting shaft, which has a spiral groove. The sliding sleeve is slidably connected to the mounting bracket along the axis of the connecting shaft. The first slider is fixed to the inner wall of the sliding sleeve and is slidably connected within the spiral groove.

[0013] Preferably, the overload protection mechanism further includes an adjustment mechanism, which includes a slide rail, a third screw, a pair of limiting sleeves, and a threaded sleeve; the slide rail is fixed to the mounting bracket, the pair of limiting sleeves are respectively sleeved on both ends of the slide rail and the limiting sleeves are slidably connected to the slide rail, the third screw is fixed to the slide rail and the third screw is inserted into the pair of limiting sleeves, the pair of threaded sleeves are respectively rotatably connected to the limiting sleeves around their axes and the threaded sleeves are threadedly sleeved on the third screw.

[0014] Preferably, the tension control mechanism further includes a temperature compensation mechanism; the temperature compensation mechanism is connected to the fine-tuning mechanism and is used to control the tension of the cable according to temperature changes.

[0015] Preferably, the temperature compensation mechanism includes a base, a bimetallic strip, a support rod, a rotating rod, a damper, a pair of first contacts, and a second contact; the base is fixed to the mounting frame, the bimetallic strip is disposed on the base, the pair of first contacts are fixed on the upper and lower sides of the bimetallic strip, the support rod is fixed to the mounting frame, the rotating rod is rotatably connected to the support rod via a pin, the pair of second contacts are fixed to one end of the rotating rod, and the first and second contacts are aligned; the damper is mounted on the mounting frame, and the other end of the rotating rod is connected to the damper.

[0016] Preferably, the temperature compensation mechanism further includes a pair of limiting rings and a second spring; the pair of limiting rings are respectively fixed on the upper and lower sides of the bimetallic strip, and the limiting rings are sleeved on the first contact. The limiting rings are connected to the rotating rod through the second spring; when the second spring loses its restraint, the second spring is used to drive the second contact to separate from the first contact.

[0017] An energy-recovery electric tensioning method for overhead lines, employing the aforementioned energy-recovery electric tensioning machine for overhead lines, specifically includes the following steps:

[0018] Step 1, Coarse Tension Adjustment: The mounting bracket is moved by the first drive mechanism, changing the angle between the traction machine and the electric tensioner, thereby changing the cable tension;

[0019] Step 2, tension fine-tuning: Adjust the distance between the cable and the mounting bracket by using a fine-tuning mechanism to fine-tune the tension on the cable.

[0020] The beneficial effects of this invention are:

[0021] By setting up a first driving mechanism and a fine-tuning mechanism, the accuracy of coarse adjustment and fine adjustment is superimposed. By adopting a purely mechanical tension control chain, the tension measurement error in the magnetic field is reduced and the tension control accuracy is improved. Furthermore, the first driving mechanism and the fine-tuning mechanism form a two-stage control system to ensure the tension adjustment range.

[0022] By setting up an overload protection mechanism and responding mechanically, damage from transient overloads such as lightning strikes can be avoided. The slippage and idling design of the double cam can withstand impacts multiple times the rated load, protecting the transmission chain and reducing maintenance costs. Furthermore, the overload threshold can be set through the adjustment mechanism to adapt to the use of cables of different sizes.

[0023] By setting up a temperature compensation mechanism, the operation of the second motor is controlled by the principle that the bimetallic strip bends with temperature changes. In addition, the damper is used to extend the driving time of the second motor with temperature changes. Furthermore, by matching the temperature change characteristics of the bimetallic strip with the thermal expansion coefficient of the cable, when the bimetallic strip bends with the temperature rises, the cable expands and elongates with the temperature rises. At this time, the bent metal strip triggers the second motor to work, realizing automatic adjustment of cable tension. Attached Figure Description

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] Figure 1 This is a first-view three-dimensional structural diagram of the entire invention;

[0026] Figure 2 This is a schematic diagram of the overall second-view three-dimensional structure of the present invention;

[0027] Figure 3 This is the present invention. Figure 2 Enlarged structural diagram of region A in the middle;

[0028] Figure 4 This is a three-dimensional magnified structural diagram of the fine-tuning mechanism of the present invention;

[0029] Figure 5 This is a three-dimensional enlarged structural schematic diagram of the second driving mechanism of the present invention;

[0030] Figure 6 This is a three-dimensional magnified exploded view of the second driving mechanism of the present invention;

[0031] Figure 7 This is a partially cross-sectional, three-dimensional enlarged structural diagram of the overload protection mechanism of the present invention;

[0032] Figure 8 This is the present invention. Figure 6 Enlarged structural diagram of region B in the middle;

[0033] Figure 9 This is a three-dimensional enlarged structural diagram of a portion of the overload protection mechanism of the present invention;

[0034] Figure 10 This is a three-dimensional enlarged structural schematic diagram of the sliding sleeve of the present invention;

[0035] Figure 11This is a partially cross-sectional, enlarged three-dimensional structural diagram of the adjustment mechanism of the present invention;

[0036] Figure 12 This is a partially cross-sectional, enlarged three-dimensional structural diagram of the temperature compensation mechanism of the present invention;

[0037] Figure 13 This is the present invention. Figure 12 Enlarged structural diagram of region C in the middle;

[0038] Figure 14 This is a flowchart of the method of the present invention.

[0039] In the diagram: 1. Frame; 2. Tension control mechanism; 21. Mounting bracket; 22. First drive mechanism; 221. Second slider; 222. Slide groove; 223. First motor; 224. Second screw; 23. Fine-tuning mechanism; 231. Universal ball; 232. Housing; 233. Guide shaft; 234. Second drive mechanism; 2341. Second motor; 2342. Worm gear; 2343. Worm wheel; 2344. First screw; 235. Overload protection mechanism; 2351. First cam; 2352. First spring; 23 53. Connecting shaft; 2354. Second cam; 2355. Spiral groove; 2356. Sliding sleeve; 2357. First slider; 236. Adjusting mechanism; 2361. Slide rail; 2362. Limiting sleeve; 2363. Third screw; 2364. Threaded sleeve; 24. Temperature compensation mechanism; 241. Base; 242. Bimetallic strip; 243. First contact; 244. Support rod; 245. Rotating rod; 246. Second contact; 247. Damper; 248. Limiting ring; 249. Second spring; 3. Cable. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1: Please refer to Figures 1-13 An energy recovery electric tensioner for overhead power lines, such as Figures 1-4As shown, it includes a tension control mechanism 2 mounted on a frame 1; the tension control mechanism 2 includes a mounting frame 21, a first drive mechanism 22, and a fine-tuning mechanism 23; wherein, the mounting frame 21 is slidably connected to the frame 1, and the cable 3 is tensioned on the mounting frame 21; the first drive mechanism 22 is mounted on the frame 1 and is used to drive the mounting frame 21 to slide on the frame 1 to control the tension of the cable 3; the fine-tuning mechanism 23 is mounted on the mounting frame 21 and is used to control the tension distance between the cable 3 and the mounting frame 21.

[0042] It should be noted that the mounting frame 21 forms a linear sliding pair with the slide groove 222 of the frame 1 through a pair of second sliders 221. The cable 3 is tensioned on the mounting frame 21, which constitutes the mechanical basis for tension transmission. When adjusting the tension, the mounting frame 21 is driven to move horizontally through the first drive mechanism 22 to change the angle between the traction machine and the tensioning machine, thereby achieving coarse tension adjustment. Then, the tensioning distance of the cable 3 is directly adjusted through the fine adjustment mechanism 23, forming a superposition of coarse and fine adjustment accuracy. By adopting a purely mechanical tension control chain, the tension measurement error in the magnetic field is reduced. The first drive mechanism 22 and the fine adjustment mechanism 23 form a two-level control system to ensure the tension adjustment range and meet the construction requirements of large cross-section cables 3.

[0043] Please see Figures 1-3 The first drive mechanism 22 includes a first motor 223, a second screw 224, and a pair of second sliders 221. A slide groove 222 is provided on the frame 1. The pair of second sliders 221 are fixed to the mounting frame 21 and are slidably connected to the slide groove 222. The first motor 223 is mounted on the frame 1. The output end of the first motor 223 is coaxially connected to the second screw 224, and one of the second sliders 221 is threadedly connected to the second screw 224.

[0044] It should be noted that one of the second sliders 221 and the second screw 224 form a threaded pair; the first motor 223 drives the second screw 224 to drive one of the second sliders 221 to slide in the slide groove 222, thereby driving the mounting bracket 21 to move; by controlling the traction angle, the tension of the cable 3 is precisely controlled, and the tension control accuracy is improved.

[0045] Please see Figures 1-2 and Figure 4-5 The fine-tuning mechanism 23 includes a universal ball 231, a housing 232, a second drive mechanism 234, and multiple guide shafts 233. The universal ball 231 is sleeved on the cable 3, the multiple guide shafts 233 are fixed on the mounting frame 21, the housing 232 is slidably connected to the guide shafts 233, and the universal ball 231 is disposed inside the housing 232. The second drive mechanism 234 is mounted on the mounting frame 21 and is used to drive the housing 232 to move along the axis of the guide shafts 233.

[0046] It should be noted that the omnidirectional ball 231 is fitted onto the cable 3 and can roll at a large angle with the radial micro-movement of the cable 3, reducing friction loss; the housing 232 forms a linear guide pair with the mounting bracket 21 through the guide shaft 233, and the second drive mechanism 234 drives the housing 232 to move along the guide shaft 233. When the housing 232 moves, the omnidirectional ball 231 pushes the cable 3, changing the tension distance, thereby realizing the fine adjustment of tension; the tension of the cable 3 is further controlled by the fine adjustment mechanism 23, realizing the precise control of the tension of the cable 3, and through the pure mechanical structure, it can still work stably in environments with high dust concentration and strong magnetic field, ensuring work efficiency.

[0047] Please see Figures 5-6 The second drive mechanism 234 includes a second motor 2341, a worm 2342, a worm wheel 2343, and a first screw 2344. The second motor 2341 is mounted on the mounting bracket 21. The output end of the second motor 2341 is coaxially connected to the worm 2342. The worm wheel 2343 is rotatably connected to the mounting bracket 21 around its axis, and the worm 2342 and the worm wheel 2343 mesh with each other. The first screw 2344 is fixed to the housing 232, and the worm wheel 2343 is threaded onto the first screw 2344.

[0048] It should be noted that the second motor 2341 drives the worm gear 2342 to rotate; the worm wheel 2343 has a threaded inner hole, forming a threaded pair with the first screw 2344 fixed to the housing 232. When the worm gear 2342 drives the worm wheel 2343 to rotate, under the action of the internal thread of the worm wheel 2343 and the guidance of the guide shaft 233, the cable 3 is started to move, thereby controlling the tension distance between the cable 3 and the mounting bracket 21. The torque of the second motor 2341 is amplified through the transmission of the worm wheel 2343 and the worm gear 2342, so that the second motor 2341 is converted into driving torque, thereby increasing the tension driving range of the cable 3. In addition, through the cooperation of the first screw 2344, high-precision displacement control is achieved, and the backlash error of traditional gear transmission is eliminated, ensuring that the fine adjustment action is lag-free, thereby improving the tension control accuracy.

[0049] Please see Figure 5 and Figures 7-9The fine-tuning mechanism 23 also includes an overload protection mechanism 235, which includes a first cam 2351, a first spring 2352, a connecting shaft 2353, a second cam 2354, a sliding sleeve 2356, and a first slider 2357. The connecting shaft 2353 is coaxially connected between the worm gear 2342 and the output end of the second drive mechanism 234. The first cam 2351 is fixed to the connecting shaft 2353, and the second cam 2354 is coaxially sleeved on the output shaft of the second motor 2341. Cam 2351 abuts against second cam 2354. Second cam 2354 is connected to the output shaft of second motor 2341 by first spring 2352. Overload protection mechanism 235 is sleeved on connecting shaft 2353. Helical groove 2355 is provided on connecting shaft 2353. Sliding sleeve 2356 is slidably connected to mounting bracket 21 along axis of connecting shaft 2353. First slider 2357 is fixed on inner wall of sliding sleeve 2356 and slidably connected in helical groove 2355.

[0050] It should be noted that the second cam 2354 is elastically connected to the shaft of the second motor 2341 via the first spring 2352, and the working surface of the first cam 2351 is in contact with the working surface of the second cam 2354; the spiral groove 2355 of the connecting shaft 2353 and the first slider 2357 on the inner wall of the sliding sleeve 2356 form a sliding pair;

[0051] When the tension is normal, the second motor 2341 drives the second cam 2354 to rotate through the first spring 2352, which in turn drives the first cam 2351 to rotate, thereby driving the worm gear 2342 to rotate, thus achieving normal tension adjustment.

[0052] When the tension is overloaded, the first cam 2351 is first driven to rotate by the second cam 2354, which in turn causes the spiral groove 2355 to drive the first slider 2357 to move the sleeve 2356 axially until the movement of the sleeve 2356 is resisted. At this time, the torque of the worm gear 2343 and worm 2342 increases sharply, and the second cam 2354 compresses the first spring 2352, causing the second cam 2354 to slip on the first cam 2351 and no longer drive the first cam 2351 to rotate, thus achieving overload protection. It can be understood that a limit switch can be set at the position where the movement of the sleeve 2356 is resisted, and the power can be cut off by triggering the limit switch.

[0053] The mechanical trigger response can avoid damage from transient overloads such as lightning strikes, and the preload of the first spring 2352 can be set to an overload threshold to reduce errors and adapt to different cable specifications 3; the slippage and free rotation design of the first cam 2351 and the second cam 2354 can withstand multiple times the rated load impact, protect the transmission chain safety, and reduce maintenance costs.

[0054] Example 2: The technical solution in this example differs from that in Example 1 in that: Please refer to... Figure 5 and Figures 7-11 The overload protection mechanism 235 also includes an adjustment mechanism 236, which includes a slide rail 2361, a third screw 2363, a pair of limit sleeves 2362, and a threaded sleeve 2364. The slide rail 2361 is fixed to the mounting bracket 21. The pair of limit sleeves 2362 are respectively fitted on both ends of the slide sleeve 2366 and are slidably connected to the slide rail 2361. The third screw 2363 is fixed to the slide rail 2361 and is inserted into the pair of limit sleeves 2362. The pair of threaded sleeves 2364 are respectively rotatably connected to the limit sleeves 2362 around their axes and are fitted on the third screw 2363.

[0055] It should be noted that the adjusting mechanism 236 adjusts the axial position of the sliding sleeve 2356 through the threaded sleeve 2364, and the third screw 2363 passes through the limiting sleeve 2362. The threaded sleeve 2364 is rotatably connected to the limiting sleeve 2362 and forms a threaded pair with the third screw 2363. When the threaded sleeve 2364 is rotated, the limiting sleeve 2362 drives the sliding sleeve 2356 to move axially, changing the trigger position of the spiral groove 2355 and realizing overload threshold calibration. It can quickly adapt to different conductor specifications, adjust the overload range, and cover the tension requirements of all specifications of overhead lines.

[0056] Please see Figure 4 and Figures 12-13The tension control mechanism 2 also includes a temperature compensation mechanism 24; the temperature compensation mechanism 24 is connected to the fine-tuning mechanism 23 and is used to control the tension of the cable 3 according to temperature changes; the temperature compensation mechanism 24 includes a base 241, a bimetallic strip 242, a support rod 244, a rotating rod 245, a damper 247, a pair of first contacts 243, and a second contact 246; the base 241 is fixed to the mounting frame 21, the bimetallic strip 242 is disposed on the base 241, the pair of first contacts 243 are fixed on the upper and lower sides of the bimetallic strip 242, the support rod 244 is fixed to the mounting frame 21, the rotating rod 245 is rotatably connected to the support rod 244 via a pin, and the pair of second contacts 246 are fixed to one end of the rotating rod 245, with the first contacts 243 and the second contacts 246 aligned; the damper... Device 247 is mounted on mounting bracket 21, and the other end of rotating rod 245 is connected to damper 247; damper 247 is prior art and is a bidirectional oil damper, which will not be described in detail; it should be noted that the tension machine also includes a controller, the first contact 243 is electrically connected to the controller via a wire, and the second contact 246 is electrically connected to the second motor 2341 via a wire; it is understood that the controller is prior art and is not shown in the figure, so it will not be described in detail; when the first contact 243 located on the upper side of bimetallic strip 242 abuts against the second contact 246, the second motor 2341 is energized to achieve forward drive; when the first contact 243 located on the lower side of bimetallic strip 242 abuts against the second contact 246, the second motor 2341 is energized to achieve reverse drive.

[0057] It should be noted that the bimetallic strip 242 is existing technology and can be a copper-steel composite that bends towards the steel layer when the temperature changes; the first contacts 243 on the upper and lower sides and the second contacts 246 on the rotating rod 245 form a conductive pair, and the damper 247 delays the movement of the rotating rod 245;

[0058] When the temperature rises, the bimetallic strip 242 pushes the rotating rod 245 to rotate. Through the action of the damper 247, the closing time of the first contact 243 and the second contact 246 increases with the temperature. This controls the second motor 2341 to fine-tune the tension, making it suitable for cross-regional construction with large temperature differences between the north and south. Furthermore, the closing time of the first contact 243 and the second contact 246 is non-linearly positively correlated with the temperature, matching the thermal expansion coefficient of the cable 3.

[0059] Please see Figures 12-13 The temperature compensation mechanism 24 also includes a pair of limiting rings 248 and a second spring 249; the pair of limiting rings 248 are respectively fixed on the upper and lower sides of the bimetallic strip 242, and the limiting rings 248 are sleeved on the first contact 243. The limiting rings 248 and the rotating rod 245 are connected by the second spring 249; when the second spring 249 loses its restriction, the second spring 249 is used to drive the second contact 246 to separate from the first contact 243.

[0060] It should be noted that when the first contact 243 and the second contact 246 are closed and in contact, the second spring 249 is compressed. When the temperature recovers, the damper 247 loses its restraint. At this time, the first contact 243 and the second contact 246 are separated by the second spring 249, and the damper 247 is reset.

[0061] Please see Figures 1-14 An energy-recovery electric tensioning method for overhead lines, employing the aforementioned energy-recovery electric tensioning machine for overhead lines, specifically includes the following steps:

[0062] Step 1, Coarse tension adjustment: The mounting bracket 21 is moved by the first drive mechanism 22 to change the angle between the traction machine and the electric tensioner, thereby changing the tension of the cable 3;

[0063] Step 2, tension fine-tuning: Adjust the distance between cable 3 and mounting bracket 21 by adjusting the fine-tuning mechanism 23, thereby fine-tuning the tension on cable 3.

[0064] In the description of this invention, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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 specific orientational structure and operation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more.

[0065] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0066] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. An energy recovery type electric tensioner for overhead power lines, characterized in that, Includes a tension control mechanism (2) mounted on the frame (1); the tension control mechanism (2) includes: Mounting bracket (21), which is slidably connected to the frame (1), and cable (3) is tensioned on the mounting bracket (21); The first drive mechanism (22) is mounted on the frame (1) and is used to drive the mounting bracket (21) to slide on the frame (1) to control the tension of the cable (3); And a fine-tuning mechanism (23); the fine-tuning mechanism (23) is mounted on the mounting frame (21) and is used to control the tension distance between the cable (3) and the mounting frame (21); The fine-tuning mechanism (23) includes a universal ball (231), a housing (232), a second drive mechanism (234), and multiple guide shafts (233); the universal ball (231) is sleeved on the cable (3), the multiple guide shafts (233) are fixed on the mounting frame (21), the housing (232) is slidably connected to the guide shafts (233), and the universal ball (231) is disposed inside the housing (232); the second drive mechanism (234) is mounted on the mounting frame (21) and is used to drive the housing (232) to move along the axis of the guide shafts (233); The tension control mechanism (2) also includes a temperature compensation mechanism (24); the temperature compensation mechanism (24) is connected to the fine-tuning mechanism (23) and is used to control the tension of the cable (3) according to temperature changes; The temperature compensation mechanism (24) includes a base (241), a bimetallic strip (242), a support rod (244), a rotating rod (245), a damper (247), a pair of first contacts (243), and a second contact (246). The base (241) is fixed to the mounting frame (21), the bimetallic strip (242) is disposed on the base (241), a pair of first contacts (243) are fixed on the upper and lower sides of the bimetallic strip (242), the support rod (244) is fixed to the mounting frame (21), the rotating rod (245) is rotatably connected to the support rod (244) by a pin, a pair of second contacts (246) are fixed to one end of the rotating rod (245), and the first contacts (243) and the second contacts (246) are aligned. The damper (247) is mounted on the mounting frame (21), and the other end of the rotating rod (245) is connected to the damper (247). When the first contact (243) located on the upper side of the bimetallic strip (242) abuts against the second contact (246), the second motor (2341) of the second drive mechanism (234) is energized to achieve forward drive; when the first contact (243) located on the lower side of the bimetallic strip (242) abuts against the second contact (246), the second motor (2341) of the second drive mechanism (234) is energized to achieve reverse drive.

2. The energy recovery type electric tensioner for overhead power lines according to claim 1, characterized in that, The first drive mechanism (22) includes a first motor (223), a second screw (224) and a pair of second sliders (221); a slide groove (222) is provided on the frame (1), a pair of second sliders (221) are fixed on the mounting frame (21), and the second sliders (221) are slidably connected to the slide groove (222). The first motor (223) is mounted on the frame (1), the output end of the first motor (223) is coaxially connected to the second screw (224), and one of the second sliders (221) is threadedly connected to the second screw (224).

3. The energy recovery type electric tensioner for overhead lines according to claim 1, characterized in that, The second drive mechanism (234) includes a second motor (2341), a worm (2342), a worm wheel (2343), and a first screw (2344); the second motor (2341) is mounted on the mounting bracket (21), the output end of the second motor (2341) is coaxially connected to the worm (2342), the worm wheel (2343) is rotatably connected to the mounting bracket (21) around its axis, and the worm (2342) meshes with the worm wheel (2343), the first screw (2344) is fixed to the housing (232), and the worm wheel (2343) is threaded onto the first screw (2344).

4. The energy recovery type electric tensioner for overhead lines according to claim 3, characterized in that, The fine-tuning mechanism (23) further includes an overload protection mechanism (235), which includes a first cam (2351), a first spring (2352), a connecting shaft (2353), a second cam (2354), a sliding sleeve (2356), and a first slider (2357). The connecting shaft (2353) is coaxially connected between the worm gear (2342) and the output end of the second drive mechanism (234). The second cam (2354) is fixed to the connecting shaft (2353). The first cam (2351) is coaxially sleeved on the output shaft of the second motor (2341), and the first cam... The wheel (2351) abuts against the second cam (2354), and the first cam (2351) is connected to the output shaft of the second motor (2341) by the first spring (2352); the overload protection mechanism (235) is sleeved on the connecting shaft (2353), the connecting shaft (2353) is provided with a spiral groove (2355), the sliding sleeve (2356) is slidably connected to the mounting bracket (21) along the axis of the connecting shaft (2353), the first slider (2357) is fixed on the inner wall of the sliding sleeve (2356), and the first slider (2357) is slidably connected in the spiral groove (2355).

5. The energy recovery type electric tensioner for overhead lines according to claim 4, characterized in that, The overload protection mechanism (235) further includes an adjustment mechanism (236), which includes a slide rail (2361), a third screw (2363), a pair of limiting sleeves (2362), and a threaded sleeve (2364). The slide rail (2361) is fixed to the mounting bracket (21). The pair of limiting sleeves (2362) are respectively fitted onto both ends of the slide sleeve (2366), and the limiting sleeves (2362) are slidably connected to the slide rail (2361). The third screw (2363) is fixed to the slide rail (2361), and the third screw (2363) is inserted into the pair of limiting sleeves (2362). The pair of threaded sleeves (2364) are respectively rotatably connected to the limiting sleeves (2362) around their axes, and the threaded sleeves (2364) are fitted onto the third screw (2363).

6. The energy recovery type electric tensioner for overhead lines according to claim 1, characterized in that, The temperature compensation mechanism (24) further includes a pair of limiting rings (248) and a second spring (249); the pair of limiting rings (248) are respectively fixed on the upper and lower sides of the bimetallic strip (242), and the limiting rings (248) are sleeved on the first contact (243). The limiting rings (248) and the rotating rod (245) are connected by the second spring (249); when the second spring (249) loses its restriction, the second spring (249) is used to drive the second contact (246) to separate from the first contact (243).

7. An energy-recovery electric tensioning method for overhead power lines, characterized in that: The use of the energy recovery electric tensioner for overhead lines according to any one of claims 1-6 specifically includes the following steps: Step 1, Coarse tension adjustment: The mounting bracket (21) is moved by the first drive mechanism (22), thereby changing the angle between the traction machine and the electric tensioner; when the angle increases, the tension increases, and when the angle decreases, the tension decreases. Step 2, tension fine adjustment: The distance between the cable (3) and the mounting bracket (21) is precisely adjusted by the fine adjustment mechanism (23), which directly affects the stress state of the cable (3) and thus achieves fine adjustment of the tension of the cable (3).

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