Electric power iron tower cable sag adjusting mechanism and adjusting method

Abstract

The invention discloses an electric power iron tower cable sag adjusting mechanism and method, and relates to the technical field of electric power cable adjusting.The electric power iron tower cable sag adjusting mechanism comprises two fixing assemblies, an adjusting assembly is arranged between the two fixing assemblies, and a positioning assembly for positioning the adjusting assembly is arranged in the middle of the adjusting assembly; the fixing assembly comprises a fixing seat, an inner fixing groove of the fixing seat is correspondingly matched with a pressing seat, a supporting shaft movably penetrates through the top of the fixing seat, the middle of the supporting shaft is fixedly sleeved with a connecting seat, the end of the outer side of the supporting shaft is sleeved with a torsional spring, the top of the connecting seat is connected with a swing seat through a connecting bolt, and a connecting block is arranged above the swing seat. A support is arranged at the bottom of the connecting block, and a limiting rod penetrates through the position between the support and the swing base. When the wind swing is increased due to the fact that the sag of the cable is large, intervention can be conducted actively in time, the wind swing amplitude of the cable is reduced by adjusting the sag of the cable, manual intervention is reduced, and meanwhile the safety of the tower body structure is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of power cable adjustment technology, specifically to a power tower cable sag adjustment mechanism and adjustment method. Background Technology

[0002] In high-voltage and ultra-high-voltage transmission lines, the sag of the cable is a key parameter affecting the safe and stable operation of the line. Excessive sag reduces the safe distance between the cable and the ground or the object it crosses, posing a safety hazard and potentially increasing the risk of wind swaying and galloping. Insufficient sag, on the other hand, leads to excessive internal stress in the cable, reducing its fatigue life and causing excessive tension due to contraction in low-temperature environments, which threatens the structural safety of the tower.

[0003] Chinese Patent Application No. 201910489900.X discloses a device for quickly adjusting the sag of a conductor, comprising a connecting sleeve, a movable sleeve connected to one side of the connecting sleeve, the movable sleeve being embedded in and fixedly connected to the connecting sleeve, a force-bearing handle fixedly connected to the outer surface of the connecting sleeve, a first threaded rod inserted and connected inside the movable sleeve, a first sag adjustment mechanism connected to the end of the first threaded rod away from the connecting sleeve, a first bearing seat rotatably connected to the end of the connecting sleeve away from the first sag adjustment mechanism, a second welding plate fixedly connected to the side wall of the first bearing seat away from the connecting sleeve, a first clamping plate fixedly connected to the side of the second welding plate away from the first bearing seat, a second clamping plate connected to the end of the first clamping plate away from the second welding plate, a movable part connected to the end of the second clamping plate away from the first clamping plate, and a second sag adjustment mechanism connected to the end of the movable part away from the second limiting bolt. However, the adjustment of sag mainly relies on the initial erection and adjustment during the construction of the line, or on manual climbing of the tower during power outage maintenance, using tools such as hoists and double hook tensioners for cumbersome and inefficient local adjustments.

[0004] Furthermore, existing adjustment devices and technologies lack dynamic adaptive capabilities. When the cable swings more violently due to excessive sag, they cannot respond and adjust in time, which can easily damage the tower structure. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a power tower cable sag adjustment mechanism and adjustment method. When the cable sag is too large and the wind swing is increased, timely and proactive intervention can be carried out to reduce the wind swing amplitude by adjusting the cable sag, effectively protecting the tower structure and effectively solving the problems in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sag adjustment mechanism for power tower cables, comprising two sets of fixing components, an adjustment component between the two sets of fixing components, and a positioning component for positioning the adjustment component in the middle of the adjustment component; The fixing component includes a fixing seat, a pressure seat correspondingly fitted inside the fixing groove of the fixing seat, a support shaft movably passing through the top of the fixing seat, a connecting seat fixedly sleeved in the middle of the support shaft, and a torsion spring sleeved on the outer end of the support shaft. The top of the connecting seat is connected to a swing seat by a connecting bolt. A connecting block is provided above the swing seat, and a support is provided at the bottom of the connecting block. A limit rod passes through the support and the swing seat. The adjustment assembly includes two symmetrically arranged transmission rods, the top ends of the two transmission rods are movably connected to a transmission seat, and wedge-shaped seats are respectively provided on both sides of the bottom of the transmission seat; The adjustment assembly also includes two symmetrically arranged side plates, each with a slide block sliding through its side. A wedge-shaped block is provided at the opposite end of each slide block, and a return spring is sleeved on the slide block. The adjustment assembly also includes a limiting seat and two symmetrically arranged slots. The slots have a trapezoidal groove in the middle. The limiting seat is fixedly sleeved on the limiting rod. Both sides of the limiting seat are provided with abutment blocks.

[0007] Preferably, the positioning component includes two symmetrically arranged guide seats, which are respectively disposed on the side plates on both sides. A movable frame is movably sleeved on each of the two guide seats. An elastic element is provided between the movable frame and the guide seat. The top of the movable frame is provided with positioning teeth. The positioning component also includes limiting teeth, which are evenly distributed on the bottom surface of the wedge-shaped blocks on both sides. The limiting teeth are inclined and cooperate with the positioning teeth.

[0008] Preferably, the positioning component further includes a base, which is located at the bottom of the two movable frames. Both sides of the base are provided with extension seats, and the ends of the extension seats are provided with contacts. The contacts on both sides correspond to the bottom of the opposite end of the fixed seats on both sides. The bottom of the base is provided with a pull rod.

[0009] Preferably, both sets of the fixing components are provided with insulator strings at the top, and the top of the insulator strings is provided with a hanger, which is connected to the crossarm of the external power tower.

[0010] Preferably, the pressure seat and the fixed seat are fixedly connected by fasteners, a cable is placed between the pressure seat and the fixed seat, and the limiting rod is arranged parallel to the cable; The two ends of the torsion spring are fixedly connected to the support shaft and the fixed seat, respectively.

[0011] Preferably, the top of the connecting block is connected to the insulator string, the support is correspondingly matched with the swing seat, and the limiting rod passes through the support on both sets of fixing components.

[0012] Preferably, the limiting rod is rotatably connected to the swing seat, the limiting rod is fixedly connected to the support, and the support shaft and connecting bolts are both set perpendicular to the limiting rod.

[0013] Preferably, the bottom ends of the two transmission rods are movably connected to the opposite ends of the pressure seats on both sides; The side plate is located between the opposite sides of the two connecting seats; The reset spring is located between the side plate and the wedge block.

[0014] Preferably, the wedge-shaped blocks on both sides respectively mate with the wedge-shaped seats on both sides. Both slot seats are respectively mounted on the slide seats on both sides via mounting bases, and the abutment blocks on both sides correspond to and cooperate with the trapezoidal slots on both sides, with a gap between the abutment blocks and the inner wall of the trapezoidal slots.

[0015] This invention also discloses a method for adjusting the sag of power transmission tower cables, comprising the following steps: S1. Place the cable between the fixing seat and the pressure seat of the fixing component, so that the fixing groove of the pressure seat and the fixing seat are matched to clamp the cable. S2. Rotate the two fixed seats to a horizontal position so that the torsion spring can store energy through elastic torsion. At this time, the fixed seat applies a downward pulling force to the transmission seat. The wedge seat and the wedge block cooperate to form a force that causes the wedge block to slide backward. The force is balanced with the spring force of the return spring, and the cable maintains its initial sag. S3. When the cable swings under the action of external force, it causes the fixed seat, connecting seat and side plate to swing around the limiting rod. When the swing amplitude is small, the trapezoidal groove does not contact the abutting blocks on both sides of the limiting seat. S4. When the swing reaches the set threshold, the inner wall of the trapezoidal groove is squeezed against the contact block, and the wedge block is driven to slide backward through the slide block. The reset spring is compressed. When the wedge block moves, the positioning teeth cooperate with the limit teeth under the action of the elastic element to realize the one-way locking of the wedge block. At the same time, the torsion spring releases the stored torque, causing the two fixed seats on both sides to rotate downward relative to one end, tightening the cable to reduce the sag and maintain the adjustment state. S5. When the downward rotation of the fixed seat at one end exceeds the set value, the bottom of the fixed seat presses the contact and drives the movable frame to move downward. The positioning tooth disengages from the limit tooth, the return spring extends and pushes the wedge block to move in the opposite direction. Through the wedge seat, the transmission seat moves upward, and the transmission rod pulls the fixed seat at one end to rotate upward, so that the cable sag is restored to a safe range.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. When the cable swings beyond a set threshold due to wind force, the fixed seat and side plate swing around the limiting rod, and the inner wall of the trapezoidal groove is squeezed against the contact block, forcing the two side slot seats and slide seats to move in opposite directions. This drives the wedge block to overcome the resistance of the return spring and slide outward. The outward movement of the wedge block releases part of the constraint on the wedge seat, and the stored torsion spring releases the torque, which pulls the transmission seat down through the transmission rod, causing the opposite end of the two fixed seats to rotate downward, thereby tensioning the cable, increasing the height and reducing the sag, and protecting the tower structure.

[0017] 2. In this invention, during the process of the wedge block being squeezed and moving outward, the inclined limiting teeth on its bottom surface move synchronously. When the tooth surface of the limiting teeth slides past the positioning teeth at the top of the movable frame, under the action of the elastic element, the positioning teeth quickly reset after passing the tooth top and form a meshing block with the vertical side of the limiting teeth, thereby realizing the one-way locking of the wedge block. This allows the wedge block to continue to move outward under the action of external force for further adjustment, but effectively prevents it from resetting inward under the action of the reset spring, thereby keeping the cable stably in the adjusted sag state, avoiding repeated loosening and tightening caused by wind changes, and enhancing the stability of line operation.

[0018] 3. When the wind force is continuously applied or the adjustment range is large, causing the fixed seat to rotate downward at an angle exceeding the safety setting value, the bottom of the fixed seat will contact and press down the contacts on both sides of the positioning component. After the contacts are pressed, they will drive the movable frame to move downward, causing the positioning teeth to disengage from the limiting teeth and releasing the one-way lock. Subsequently, the return spring extends and pushes the wedge blocks on both sides to move in opposite directions. The wedge blocks drive the wedge seat and the transmission seat to move upward, and then pull the fixed seat at the opposite end upward through the transmission rod, so that the cable releases part of the tension and the sag is appropriately restored, ensuring that the cable tension is always within the safe range. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the bottom first angle structure of the present invention; Figure 3 This is a schematic diagram of the bottom second angle structure of the present invention; Figure 4 This is a schematic diagram of the bottom third angle structure of the present invention; Figure 5 This is a schematic diagram of the fourth angle structure at the bottom of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle.

[0020] In the diagram: 1. Fixing component; 101. Fixing seat; 102. Pressure seat; 103. Fastener; 104. Support shaft; 105. Torsion spring; 106. Connecting seat; 107. Connecting bolt; 108. Swing seat; 109. Support; 110. Limiting rod; 111. Connecting block; 2. Insulator string; 3. Hanger; 4. Adjusting component; 401. Transmission rod; 402. Transmission seat; 403. Wedge seat 404. Side plate; 405. Slide block; 406. Wedge block; 407. Return spring; 408. Mounting base; 409. Slot seat; 410. Limiting seat; 411. Abutting block; 5. Positioning assembly; 501. Guide seat; 502. Movable frame; 503. Elastic element; 504. Positioning tooth; 505. Limiting tooth; 506. Base; 507. Extension seat; 508. Contact; 509. Pull rod. Detailed Implementation

[0021] 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.

[0022] Example 1 Please see Figures 1-6 This embodiment provides a sag adjustment mechanism for power tower cables, including two sets of fixing components 1. Each set of fixing components 1 is provided with an insulator string 2 at its top. The insulator string 2 is provided with a hanger 3 at its top. The hanger 3 is connected to the crossarm of the external power tower. An adjustment component 4 is provided between the two sets of fixing components 1. A positioning component 5 for positioning the adjustment component 4 is provided in the middle of the adjustment component 4.

[0023] Specifically, the fixing component 1 is used to fix the cable, the connection between the top of the insulator string 2 and the hanger 3 is a snap-fit ​​to limit the swing of the insulator string 2, and the adjusting component 4 is used to adjust the sag of the cable.

[0024] The fixing component 1 includes a fixing base 101, and a pressure base 102 is correspondingly fitted in the internal fixing groove of the fixing base 101. The pressure base 102 and the fixing base 101 are fixedly connected by a fastener 103, and a cable is placed between the pressure base 102 and the fixing base 101.

[0025] Specifically, the fastener 103 is preferably a U-shaped fastener. The cable is fixed by passing the cable through the bottom of the fixing groove in the fixing seat 101 and then pressing the pressure seat 102 into the fixing groove. The cable is fixed by passing the fastener 103 through the fixing seat 101 and the pressure seat 102 and tightening the nut.

[0026] A support shaft 104 is movably passed through the top of the fixed base 101. A connecting seat 106 is fixedly sleeved in the middle of the support shaft 104. A torsion spring 105 is sleeved on the outer end of the support shaft 104. The two ends of the torsion spring 105 are fixedly connected to the support shaft 104 and the fixed base 101, respectively.

[0027] Specifically, in the initial state, the opposite end of the two fixing seats 101 is lower than the opposite end, that is, the two fixing seats 101 are initially in an inverted "V" shape. At this time, the torsion spring 105 is in a normal state and is not twisted. When the two fixing seats 101 rotate to the position shown in the figure... Figure 3 and 4 In the horizontal position shown, the torsion spring 105 is twisted and in an energy storage state, and at this time there is slack in the cable located between the two fixing seats 101.

[0028] The top of the connecting seat 106 is connected to the swing seat 108 by the connecting bolt 107. A connecting block 111 is provided above the swing seat 108. The top of the connecting block 111 is connected to the insulator string 2. A support 109 is provided at the bottom of the connecting block 111. The support 109 and the swing seat 108 are correspondingly matched. A limit rod 110 passes through the support 109 and the swing seat 108. The limit rod 110 passes through the support 109 on the two sets of fixing components 1. The limit rod 110 is rotatably connected to the swing seat 108. The limit rod 110 is fixedly connected to the support 109. The limit rod 110 is arranged parallel to the cable. The support shaft 104 and the connecting bolt 107 are both arranged perpendicular to the limit rod 110.

[0029] Specifically, the connection method between the top of the connecting block 111 and the bottom of the insulator string 2 is preferably a snap-fit. The limiting rod 110 is fixedly connected to the support 109 to prevent relative rotation between the limiting rod 110 and the support 109. The limiting rod 110 is rotatably connected to the swing seat 108 to enable the swing seat 108 to rotate around the limiting rod 110. The limiting rod 110 is set parallel to the cable and perpendicular to the support shaft 104 and the connecting bolt 107 to ensure that the cable can only rotate around the limiting rod 110.

[0030] The adjustment assembly 4 includes two symmetrically arranged transmission rods 401. The bottom ends of the two transmission rods 401 are movably connected to the opposite ends of the pressure seats 102 on both sides. The top ends of the two transmission rods 401 are movably connected to a transmission seat 402. Wedge-shaped seats 403 are provided on both sides of the bottom of the transmission seat 402.

[0031] The adjustment assembly 4 also includes two symmetrically arranged side plates 404, which are located between the opposite sides of the two connecting seats 106. The sides of the two side plates 404 are slidably connected by slide seats 405. The opposite ends of the slide seats 405 on both sides are provided with wedge blocks 406, and the wedge blocks 406 on both sides cooperate with the wedge seats 403 on both sides respectively.

[0032] A return spring 407 is sleeved on the slide 405, and the return spring 407 is located between the side plate 404 and the wedge block 406.

[0033] Specifically, such as Figure 3 and 4 As shown, since the torsion spring 105 is in an energy storage state at this time, the opposite ends of the fixed seats 101 on both sides always provide a downward pulling force to the transmission rods 401 on both sides, and thus provide a downward pulling force to the transmission seat 402.

[0034] Simultaneously, due to the corresponding engagement of the wedge seat 403 and the wedge block 406, the downward pulling force on the transmission seat 402 is applied to the wedge block 406 through the wedge seat 403, causing the wedge blocks 406 on both sides to tend to move to the sides respectively. The return spring 407 is compressed, and the reverse force of the return spring 407 is used to prevent the wedge blocks 406 on both sides from moving in opposite directions, thereby preventing the transmission seat 402 from moving downward, thus achieving the goal of keeping the fixed seat 101 as it is under normal conditions. Figure 3 and 4 The horizontal state shown.

[0035] The adjustment assembly 4 also includes a limiting seat 410 and two symmetrically arranged slot seats 409. The two slot seats 409 are respectively mounted on the slide seats 405 on both sides via mounting seats 408. A trapezoidal groove is opened in the middle of the slot seat 409. The limiting seat 410 is fixedly sleeved on the limiting rod 110. Abutment blocks 411 are provided on both sides of the limiting seat 410. The abutment blocks 411 on both sides correspond to the trapezoidal grooves on both sides. There is a gap between the abutment blocks 411 and the inner wall of the trapezoidal groove.

[0036] Specifically, when the cable swings under the action of external wind, it causes the fixed seat 101 to swing. The fixed seat 101 causes the connecting seat 106 to swing, and the connecting seat 106 causes the swing seat 108 to swing around the limit rod 110. At the same time, the connecting seat 106 causes the side plate 404 to swing, and the side plate 404 causes the mounting seat 408 and the slot seat 409 to swing. Since there is a gap between the inner wall of the trapezoidal slot and the contact block 411, the inner wall of the trapezoidal slot of the slot seat 409 does not contact the contact block 411 when swinging at a small amplitude.

[0037] Furthermore, when the swing amplitude increases to a certain extent, the swing amplitude of the slot seat 409 increases, causing the inner wall of the trapezoidal slot of the slot seat 409 to be abutted by the abutment block 411, causing the slot seats 409 on both sides to move away from each other. This causes the wedge blocks 406 on both sides to move away from each other through the slide seat 405, and the return spring 407 is passively compressed. Under the return force of the torsion spring 105, the transmission seat 402 is driven to move downward through the transmission rod 401. At the same time, the opposite ends of the fixed seats 101 on both sides rotate downward, causing the opposite ends of the fixed seats 101 on both sides to rotate upward, thereby tightening the two sides of the cable and increasing the height of the cable, reducing the sag of the cable.

[0038] The positioning component 5 includes two symmetrically arranged guide seats 501, which are respectively located on the side plates 404 on both sides. Each guide seat 501 is movably fitted with a movable frame 502. An elastic element 503 is provided between the movable frame 502 and the guide seat 501. The top of the movable frame 502 is provided with a positioning tooth 504. The positioning component 5 also includes a limiting tooth 505, which is evenly distributed on the bottom surface of the wedge-shaped blocks 406 on both sides. The limiting tooth 505 is inclined and corresponds to and cooperates with the positioning tooth 504.

[0039] Specifically, when the wedge blocks 406 on both sides move away from each other, they will drive the bottom limiting tooth 505 to move. During the process of the limiting tooth 505 passing the positioning tooth 504, the end of the positioning tooth 504 moves along the inclined surface of the limiting tooth 505. At the same time, the movable frame 502 moves downward along the guide seat 501, and the elastic element 503 is compressed. The elastic element 503 is preferably an elastic sheet. When the positioning tooth 504 completely passes through a single limiting tooth 505, the side of the limiting tooth 505 will abut against the side of the positioning tooth 504 to prevent the separated wedge blocks 406 from resetting under the action of the reset spring 407, which would cause the sag adjustment to fail.

[0040] In use, the cable is clamped and fixed between the fixing seat 101 and the pressure seat 102. In the initial state, under the action of the torsion spring 105, the height of the opposite end of the fixing seat 101 on both sides is lower than the height of the opposite end. The fixing seats 101 on both sides are in an inverted "V" shape. At this time, the torsion spring 105 is in a natural state. When the fixing seats 101 on both sides are rotated to a horizontal state by the operator using tools, the fixing seats 101 on both sides tend to rotate around the support shaft 104 under the action of the elastic torque of the torsion spring 105, causing the opposite end of the fixing seats 101 on both sides to swing downward. In this horizontal state, the torsion spring 105 is in an energy storage state.

[0041] Under normal operating conditions without external interference, the mechanism needs to maintain the initial design sag of the cable. At this time, the torsion spring 105, which is in an energy storage state, always applies an elastic restoring torque to the fixed seat 101, causing one end to rotate downward. This torque is transmitted to the transmission rod 401 through the pressure seat 102, thereby applying a downward pulling force to the transmission seat 402. The wedge-shaped seat 403 at the bottom of the transmission seat 402 cooperates with the inclined surfaces of the wedge blocks 406 on both sides, decomposing the downward pulling force into a horizontal component force that causes the wedge blocks 406 on both sides to slide in opposite directions. This horizontal component force tends to make the wedge blocks 406 move outward against the elastic force of the return spring 407. However, in the initial equilibrium state, the preload of the return spring 407 is balanced with the horizontal component force generated by the wedge transmission, preventing the movement of the wedge blocks 406, and thus locking the downward movement of the transmission seat 402. Therefore, the fixed seat 101 is stabilized in a horizontal position, and the cable sag is maintained.

[0042] When the cable swings due to wind, it will cause the fixed seat 101 and the connecting seat 106 to swing together. The connecting seat 106 will cause the side plate 404 and the slot seat 409 fixed thereon to swing around the axis of the limiting rod 110. When the swing amplitude is small, there is a gap between the inner wall of the trapezoidal slot of the slot seat 409 and the abutting block 411 on the limiting seat 410, and the two do not come into contact, so the mechanism remains unchanged.

[0043] When the wind swing intensifies and the swing amplitude increases to a certain threshold, the swing angle of the slot seat 409 causes the inclined inner wall of the trapezoidal slot to come into contact with the abutment block 411 and generate compression. Since the trapezoidal slots of the two slot seats 409 are symmetrically arranged, the compression effect of the abutment blocks 411 on both sides forces the two slot seats 409 together with the mounting base 408 to move away from each other. This movement is transmitted to the wedge block 406 through the slide 405, overcoming the resistance of the return spring 407 and driving the two wedge blocks 406 to slide in opposite directions.

[0044] The outward movement of the wedge block 406 releases part of the locking effect of the wedge block 406 on the wedge seat 403. At this time, the reset torque of the energy-storing torsion spring 105 is released to a certain extent. The transmission rod 401 pulls the transmission seat 402 downward, and the opposite ends of the two fixed seats 101 rotate downward synchronously. According to the lever principle, when the opposite ends of the fixed seats 101 rotate downward, the opposite ends that are far apart rotate upward accordingly. At the same time, the previously reserved cable allowance is retracted to both sides, thereby tensioning the middle section of the cable, increasing the height of the cable above the ground, realizing the automatic adjustment of reducing the sag of the cable, and reducing the swing of the cable caused by external forces, thereby protecting the tower structure.

[0045] As the wedge block 406 moves outward under the drive of the slot seat 409, the inclined limiting tooth 505 on the bottom surface of the wedge block 406 moves accordingly. When the inclined surface of the limiting tooth 505 slides past the positioning tooth 504 at the top of the movable frame 502, it will press the positioning tooth 504 and the movable frame 502 to move downward along the guide seat 501, compressing the elastic element 503. Once the top of the positioning tooth 504 passes the tooth tip of the limiting tooth 505, under the restoring force of the elastic element 503, the movable frame 502 drives the positioning tooth 504 to move upward. At this position, the vertical side of the limiting tooth 505 engages with the side of the positioning tooth 504, thereby achieving a one-way locking state. This allows the wedge block 406 to continue moving outward under external force, but effectively prevents the wedge block 406 from resetting inward under the action of the return spring 407. Therefore, when the wind swing action continues intermittently for a long time, the wedge block 406 is locked in one direction, and the cable is maintained in the new state after adjustment with reduced sag, thus maintaining the adjustment effect and preventing frequent fluctuations in cable sag.

[0046] Example 2 However, if the downward rotation of the opposite end of the fixing seat 101 on both sides is too large, it will cause excessive internal stress in the cable, reducing its fatigue life, and will also cause excessive tension in the cable, threatening the safety of the external tower structure. Therefore: The positioning component 5 also includes a base 506, which is located at the bottom of the two movable frames 502. Both sides of the base 506 are provided with extension seats 507, and the ends of the extension seats 507 are provided with contacts 508. The contacts 508 on both sides correspond to the bottom of the opposite end of the fixed seats 101 on both sides. The bottom of the base 506 is provided with a pull rod 509.

[0047] As the cable sag gradually decreases, the downward rotation angle of the opposite ends of the fixed seats 101 on both sides gradually increases. When the downward rotation angle of the opposite ends of the fixed seats 101 on both sides exceeds a certain range, it will abut against the contact 508, causing the extension seat 507 to drive the base 506 to move downward. The base 506 drives the movable frames 502 on both sides to move downward, and the elastic element 503 is compressed, causing the positioning tooth 504 to disengage from the limiting tooth 505. This causes the return springs 407 on both sides to return to their original position and extend, driving the wedge blocks 406 on both sides to move in opposite directions. This, in turn, drives the transmission seat 402 to move upward through the wedge seat 403. Through the transmission rod 401, the opposite ends of the fixed seats 101 on both sides rotate upward by a certain range, thereby restoring a certain sag to the cable and preventing excessive cable tension to protect the cable and tower structure.

[0048] The pull rod 509 is designed so that workers can use a tool with a hook to pull the pull rod 509 downwards from a distance to quickly move the movable frame 502 downwards, thereby rapidly increasing the sag of the cable.

[0049] Example 3 This invention also discloses a method for adjusting the sag of power transmission tower cables, comprising the following steps: S1. Place the cable between the fixing seat 101 and the pressure seat 102 of the fixing component 1, so that the pressure seat 102 and the fixing groove of the fixing seat 101 are correspondingly engaged to clamp the cable. Specifically, when tightening, force should be applied evenly to avoid excessive tightening on one side, which could lead to localized stress concentration in the cable. After installation, check that the cable does not slip or twist in the fixing groove to ensure that the cable is reliably clamped without damaging the surface.

[0050] S2. Rotate the two fixed seats 101 to the horizontal position, so that the torsion spring 105 can elastically torsion and store energy. At this time, the fixed seat 101 applies a downward pulling force to the transmission seat 402. The wedge seat 403 and the wedge block 406 cooperate accordingly to form a force that causes the wedge block 406 to slide backward. The force is balanced with the elastic force of the return spring 407, and the cable maintains its initial sag. Specifically, using a special tool such as an insulated wrench, the two fixed seats 101 are rotated synchronously around the support shaft 104 to a horizontal state. At this time, the torsion spring 105 is twisted and stores elastic potential energy, the transmission seat 402 is subjected to a downward pulling force, and the wedge seat 403 contacts the inclined surface of the wedge block 406, forming a tendency for the wedge block 406 to move outward. This tendency is balanced with the preload of the return spring 407 so that the whole is in a stable initial state and the cable maintains the designed sag.

[0051] S3. When the cable swings under the action of external force, it causes the fixed seat 101, the connecting seat 106 and the side plate 404 to swing around the limiting rod 110. When the swing amplitude is small, the trapezoidal groove does not contact the abutment blocks 411 on both sides of the limiting seat 410. Specifically, when the wind force is small and the cable swing amplitude does not exceed the set threshold, the fixed seat 101 drives the connecting seat 106 and the side plate 404 to swing slightly around the limiting rod 110. Since there is a design gap between the inner wall of the trapezoidal groove of the slot seat 409 and the contact block 411, the two do not come into contact. The position of the wedge block 406 remains unchanged, the mechanism does not trigger the adjustment action, and the cable sag remains unchanged.

[0052] The swing threshold is determined by the size of the gap between the trapezoidal groove and the contact block 411, and can be adjusted during the design phase according to the actual wind zone level and cable type.

[0053] S4. When the swing amplitude reaches the set threshold, the inner wall of the trapezoidal groove is pressed against the abutment block 411, and the wedge block 406 is driven to slide backward through the slide block 405. The return spring 407 is compressed. When the wedge block 406 moves, the positioning tooth 504 is engaged with the limiting tooth 505 under the action of the elastic element 503 to realize the one-way locking of the wedge block 406. At the same time, the torsion spring 105 releases the stored torque, causing the two fixed seats 101 on both sides to rotate downward relative to one end, tightening the cable to reduce the sag and maintain the adjustment state. Specifically, when the wind force increases and the cable swing amplitude increases to the point that the inner wall of the trapezoidal groove contacts the contact block 411 and generates pressure, the mechanism enters the adjustment state: The two side slot seats 409 are squeezed and move in opposite directions. The slide seat 405 drives the wedge block 406 to move outward. The return spring 407 is compressed. The outward movement of the wedge block 406 releases part of the constraint on the wedge seat 403. The torsion spring 105 releases its stored energy and drives the transmission seat 402 to move downward. The transmission rod 401 pulls the fixed seat 101 to rotate downward at one end. The cable is tightened to both sides, and the sag is reduced. The bottom limit tooth 505 of the wedge block 406 cooperates with the positioning tooth 504 to achieve one-way locking and prevent the wedge block 406 from resetting, so as to maintain the adjusted state.

[0054] Under the action of the elastic element 503, the positioning tooth 504 is always engaged or in a state of waiting to be engaged with the limiting tooth 505, ensuring that the adjustment process is irreversible until the reset mechanism is triggered.

[0055] S5. When the downward rotation of the fixed seat 101 at one end exceeds the set value, the bottom of the fixed seat 101 presses the contact 508 and drives the movable frame 502 to move downward. The positioning tooth 504 disengages from the limiting tooth 505, the reset spring 407 extends and pushes the wedge block 406 to move in the opposite direction. Through the wedge seat 403, the transmission seat 402 moves upward, and the transmission rod 401 pulls the fixed seat 101 at one end to rotate upward, so that the cable sag is restored to a safe range.

[0056] Specifically, if the cable continues to be affected by wind or is over-adjusted, the fixed seat 101 rotates too much at one end, and its bottom contacts and presses down on the contact 508. The contact 508 is pressed down, causing the extension seat 507, the base 506 and the movable frame 502 to move down. The elastic element 503 is compressed, the positioning tooth 504 disengages from the limiting tooth 505, and the one-way lock is released. The return spring 407 pushes the wedge block 406 to move in opposite directions, the wedge seat 403 moves up, the transmission seat 402 rises accordingly, and the transmission rod 401 pulls the fixed seat 101 to lift up at one end, so that the cable sag is properly restored and excessive tension is avoided.

[0057] Furthermore, the pull rod 509 can be remotely hooked and pulled by hand using an insulated operating rod, which can actively trigger the reset mechanism and is suitable for maintenance or emergency adjustment.

[0058] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A sag adjustment mechanism for power transmission tower cables, comprising two sets of fixing components (1), characterized in that, An adjustment component (4) is provided between the two sets of fixed components (1), and a positioning component (5) for positioning the adjustment component (4) is provided in the middle of the adjustment component (4). The fixing component (1) includes a fixing seat (101), a pressure seat (102) corresponding to the internal fixing groove of the fixing seat (101), a support shaft (104) movably passing through the top of the fixing seat (101), a connecting seat (106) fixedly sleeved in the middle of the support shaft (104), and a torsion spring (105) sleeved on the outer end of the support shaft (104). The top of the connecting seat (106) is connected to the swing seat (108) by the connecting bolt (107). A connecting block (111) is provided above the swing seat (108), and a support (109) is provided at the bottom of the connecting block (111). A limit rod (110) passes through the support (109) and the swing seat (108). The adjustment assembly (4) includes two symmetrically arranged transmission rods (401), the top ends of the two transmission rods (401) are movably connected to a transmission seat (402), and wedge-shaped seats (403) are respectively provided on both sides of the bottom of the transmission seat (402). The adjustment assembly (4) also includes two symmetrically arranged side plates (404), and slide blocks (405) are slidably passed through the sides of the two side plates (404). A wedge block (406) is provided at the opposite end of the slide blocks (405) on both sides, and a return spring (407) is sleeved on the slide block (405). The adjustment component (4) also includes a limiting seat (410) and two symmetrically arranged slots (409). The slots (409) have a trapezoidal groove in the middle, and the limiting seat (410) has abutting blocks (411) on both sides.

2. The power tower cable sag adjustment mechanism according to claim 1, characterized in that: The positioning component (5) includes two symmetrically arranged guide seats (501), which are respectively located on the side plates (404) on both sides. Each guide seat (501) is movably sleeved with a movable frame (502). An elastic element (503) is provided between the movable frame (502) and the guide seat (501). The top of the movable frame (502) is provided with a positioning tooth (504). The positioning component (5) also includes a limiting tooth (505), which is evenly distributed on the bottom surface of the wedge-shaped blocks (406) on both sides. The limiting tooth (505) is inclined and corresponds to the positioning tooth (504).

3. The sag adjustment mechanism for power transmission tower cables according to claim 2, characterized in that: The positioning component (5) also includes a base (506), which is located at the bottom of the two movable frames (502) on both sides. Both sides of the base (506) are provided with extension seats (507), and the ends of the extension seats (507) are provided with contacts (508). The contacts (508) on both sides correspond to the bottom of the opposite end of the fixed seats (101) on both sides respectively. The bottom of the base (506) is provided with a pull rod (509).

4. The sag adjustment mechanism for power transmission tower cables according to claim 1, characterized in that: Both sets of fixed components (1) are provided with insulator strings (2) at the top, and the insulator strings (2) are provided with hangers (3) at the top, which are connected to the crossarm of the external power tower.

5. The sag adjustment mechanism for power transmission tower cables according to claim 1, characterized in that: The pressure seat (102) and the fixed seat (101) are fixedly connected by fasteners (103), and a cable is placed between the pressure seat (102) and the fixed seat (101). The limiting rod (110) is arranged parallel to the cable. The two ends of the torsion spring (105) are fixedly connected to the support shaft (104) and the fixed seat (101), respectively.

6. The power tower cable sag adjustment mechanism according to claim 4, characterized in that: The top of the connecting block (111) is connected to the insulator string (2), the support (109) is correspondingly engaged with the swing seat (108), and the limiting rod (110) passes through the support (109) on the two sets of fixing components (1).

7. The power tower cable sag adjustment mechanism according to claim 1, characterized in that: The limiting rod (110) is rotatably connected to the swing seat (108), and the limiting rod (110) is fixedly connected to the support (109). The support shaft (104) and the connecting bolt (107) are both set perpendicular to the limiting rod (110).

8. The sag adjustment mechanism for power transmission tower cables according to claim 1, characterized in that: The bottom ends of the two transmission rods (401) are movably connected to the opposite ends of the pressure seats (102) on both sides; The side plate (404) is located between the opposite sides of the two connecting seats (106); The reset spring (407) is located between the side plate (404) and the wedge block (406).

9. The sag adjustment mechanism for power transmission tower cables according to claim 1, characterized in that: The wedge-shaped blocks (406) on both sides respectively cooperate with the wedge-shaped seats (403) on both sides. Both of the slot seats (409) are respectively mounted on the slide seats (405) on both sides via mounting seats (408). The limiting seat (410) is fixedly sleeved on the limiting rod (110). The abutting blocks (411) on both sides correspond to the trapezoidal grooves on both sides respectively. There is a gap between the abutting block (411) and the inner wall of the trapezoidal groove.

10. A method for adjusting the sag of a power tower cable, wherein the method utilizes the power tower cable sag adjusting mechanism as described in claim 3 to adjust the cable sag, characterized in that... Includes the following steps: S1. Place the cable between the fixing seat (101) and the pressure seat (102) of the fixing component (1), so that the fixing seat (102) and the fixing groove of the fixing seat (101) are correspondingly engaged to clamp the cable. S2. Rotate the two fixed seats (101) to a horizontal position, so that the torsion spring (105) can store energy through elastic torsion. At this time, the fixed seat (101) applies a downward pulling force to the transmission seat (402). The wedge seat (403) and the wedge block (406) cooperate accordingly to form a force that causes the wedge block (406) to slide backward. The force is balanced with the elastic force of the return spring (407), and the cable maintains its initial sag. S3. When the cable swings under the action of external force, it causes the fixed seat (101), the connecting seat (106) and the side plate (404) to swing around the limiting rod (110). When the swing amplitude is small, the trapezoidal groove does not contact the abutting blocks (411) on both sides of the limiting seat (410). S4. When the swing amplitude reaches the set threshold, the inner wall of the trapezoidal groove is squeezed against the contact block (411), and the wedge block (406) is driven to slide backward through the slide block (405). The reset spring (407) is compressed. When the wedge block (406) moves, the positioning tooth (504) cooperates with the limiting tooth (505) under the action of the elastic element (503) to realize the one-way locking of the wedge block (406). At the same time, the torsion spring (105) releases the stored torque so that the two fixed seats (101) on both sides rotate downward relative to one end, tightening the cable to reduce the sag and maintain the adjustment state. S5. When the fixed seat (101) rotates downward more than the set value at one end, the bottom of the fixed seat (101) presses the contact (508) and drives the movable frame (502) to move downward. The positioning tooth (504) disengages from the limit tooth (505), the reset spring (407) extends and pushes the wedge block (406) to move in opposite directions. Through the wedge seat (403), the transmission seat (402) moves upward. The transmission rod (401) pulls the fixed seat (101) to rotate upward at one end, so that the cable sag is restored to a safe range.

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