Cable tension adjusting device on electric power tower

Abstract

The invention relates to a cable tension adjusting device on an electric power tower, and belongs to the technical field of overhead cable installation. The device comprises a tower frame and a cable, the front side and the rear side of the top of the tower frame are each provided with a first limiting wheel and a second limiting wheel which are used for supporting the cable in a rolling mode, and an automatic tension adjusting mechanism used for adjusting the tension of the cable is correspondingly arranged between each first limiting wheel and the corresponding second limiting wheel. The automatic tension adjusting mechanism comprises a sliding plate, a fixing plate, a sliding rail, a pulley A, a traction wheel, a pulley B, a pulley C, a pulley D and a cable, a pulley groove of the traction wheel is clamped above the cable, and the vertical pressure applied to the cable by the traction wheel is larger than the gravity of the counterweight assembly through a pulley block formed by the pulley A, the pulley B, the pulley C and the pulley D. The device is simple and reliable in structure and easier to implement.

Description

Technical Field

[0001] The invention relates to a cable tension regulating device on a power pole tower, belonging to the technical field of overhead cable installation. Background Art

[0002] Power towers are supporting structures used to support transmission lines in overhead transmission lines. According to their functions, they can be divided into load-bearing towers, straight towers, transposition towers and large-span towers. Towers are mostly made of steel or reinforced concrete and are the main supporting structures for overhead transmission lines. In the power grid lines for residential power supply, the scraping of wires against buildings or tree branches is a common safety hazard. This is mainly because the cables installed over a long span expand and contract due to the influence of the temperature. This makes the cables longer when the temperature is high, and their falling arc becomes significantly larger. The cables between the two towers become loose. When it is windy and rainy, the cable shakes more, which will aggravate the friction between the cable insulation and the building or branches, which can easily cause cable leakage. In addition, when the temperature is low, the cable shortens, and the cable between the two towers will be overly tight, which will cause the top of the tower to be subjected to greater force, thereby affecting the service life of the tower. In order to keep the cables between the towers in a reasonable tight state, the existing technology usually considers adding a cable tension adjustment device to the top of the power tower.

[0003] For example, a Chinese patent document with publication number CN216971592U discloses a wire and cable tension adjustment device, comprising a vertical rod, wherein both sides of the top of the vertical rod are respectively fixedly connected with cross rods, and the ends of the cross rods are respectively rotatably installed with support wheels, and the surfaces of two groups of the support wheels support cables, and the support wheels include two groups of first rotating disks that are relatively distributed, and the two side walls opposite to each other of the two groups of first rotating disks are rotatably connected with two groups of first guide rollers that are relatively distributed, and the cable passes through the two groups of first guide rollers, and the top of the vertical rod is provided with an adjustment mechanism that cooperates with the cable, and the adjustment mechanism includes a load-bearing wheel and a lifting part, and the lifting part is connected to the load-bearing wheel, and the load-bearing wheel includes two groups of second rotating disks that are relatively distributed, and the two groups of the second rotating disks are rotatably connected with two groups of second guide rollers that are relatively distributed, and a vibration mechanism that cooperates with the first rotating disk is provided inside the vertical rod, and the vibration mechanism includes a connecting rod and a shaking part, and one end of the support rod is rotatably connected to the surface of the first rotating disk, and the other end of the support rod is connected to the shaking part. In its specific implementation, the motor is mainly used to drive the load-bearing wheel to rise and fall, change the force applied by the load-bearing wheel to the cable, and thus realize the cable tension adjustment. This solution involves the control and use of the motor, and the operation and control are relatively cumbersome, and there may be situations where the adjustment is not timely. If the cable tension detection mechanism or the cable sag detection mechanism is considered to realize the linkage control, the overall structure is relatively complex and the cost is relatively high.

[0004] In addition, a Chinese patent document with the publication number CN220775336U discloses a power line sag tool, including: a base, a telegraph pole is fixedly connected to the top of the base; a support mechanism for adjusting the sag of the cable is installed at the top of the surface of the telegraph pole; by setting the support mechanism, when adjusting the sag degree of the cable body, the electric push rod drives one end of the L-shaped adjusting rod at the bottom of the mounting plate to move up and down, and drives one end of the cross bar to tilt up through the connection with the rotating shaft on one side of the bottom of the cross bar, and then rotates and supports the cable body through the support wheel, jacks up both ends of the cable body, and expands both ends of the cable body to both sides of the cross bar. This solution involves the control and use of the electric push rod and has the same disadvantages as the technical solution provided by the Chinese patent document with the publication number CN216971592U. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a cable tension adjusting device on a power pole tower, which has a simple and reliable structure and is easier to implement.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a cable tension adjusting device on a power pole tower, including a pole tower frame and a cable. A set of limit wheels are respectively installed on the front side and the rear side of the top of the pole tower frame through brackets. Each set of limit wheels includes a first limit wheel arranged on the left side of the pole tower frame and a second limit wheel arranged on the right side of the pole tower frame. The first limit wheel and the second limit wheel are used for rolling support of the cable. A tension automatic adjustment mechanism for adjusting the cable tension is correspondingly arranged between each set of the first limit wheel and the second limit wheel. The tension automatic adjustment mechanism includes a sliding plate and a fixing plate. A vertically arranged slide rail is arranged on the side surface of the pole tower frame. The sliding plate is slidably connected to the side surface of the pole tower frame through the slide rail. A rotating shaft is fixed to the top of the sliding plate, and a pulley A and a pulling wheel arranged coaxially are rotatably sleeved on the rotating shaft. The pulley groove of the pulling wheel is clamped above the cable. A pulley B is rotatably installed at the bottom end of the sliding plate; the fixing plate is fixedly arranged on the side surface of the pole tower frame and in the area below the vertical slide rail. A pulley C is rotatably installed at the top of the fixing plate, and a pulley D is rotatably installed at the bottom of the fixing plate. A cable is fixed to the bottom end of the sliding plate. One end of the cable away from the sliding plate sequentially bypasses the pulley C, the pulley B, the pulley D and the pulley A, and extends below the fixing plate and then is connected with a counterweight assembly. The axes of the pulley A, the pulling wheel, the pulley B, the pulley C, the pulley D and the limit wheel are all horizontally arranged along the front-rear direction. The pulley group composed of the pulley A, the pulley B, the pulley C and the pulley D makes the vertical pressure exerted by the pulling wheel on the cable greater than the gravity of the counterweight assembly itself.

[0007] To make the structure simple and reliable, a further preferred solution is that the pulley B, the pulley C and the pulley D are all directly below the pulley A, and the diameter value of the pulley B = the diameter value of the pulley C < the diameter value of the pulley D < the diameter value of the pulley A.

[0008] For the purpose of making the structure simple and reliable, a further preferred solution is that, in the horizontal direction, the pulling wheel is arranged at the exact middle position between the first limiting wheel and the second limiting wheel.

[0009] For better ensuring the safety of the power system, a further preferred solution is that the limiting wheels, pulley A, pulling wheel, pulley B, pulley C and pulley D are all made of ceramic materials.

[0010] For the purpose of making the structure simple and reliable and easy to assemble and implement, a further preferred solution is that the counterweight assembly includes a box body and a plurality of counterweight blocks. A vertically arranged limiting rod is fixedly connected inside the box body. The counterweight blocks are clamped inside the box body through the limiting rod, and a card slot for the limiting rod to be inserted is provided on the side surface of the counterweight block.

[0011] For the purpose of making the structure simple and reliable and easy to assemble and implement, a further preferred solution is that a vertically arranged sliding rod is fixedly provided on the side surface of the pole tower frame, and the box body is slidably arranged on the side surface of the pole tower frame through the sliding rod.

[0012] For the purpose of making the structure more reliable, a further preferred solution is that there are two limiting rods arranged side by side, and each counterweight block has a card slot corresponding to the limiting rod one by one.

[0013] For the purpose of making the structure more reliable, a further preferred solution is that a sliding cavity communicating with the two card slots is formed inside the counterweight block. Two clamping blocks are slidably connected inside the sliding cavity, and the two clamping blocks are respectively located at both ends of the sliding cavity. A compression spring is arranged inside the sliding cavity and is located between the two clamping blocks; a limiting protrusion is provided on the side surface of each clamping block, and a limiting cavity matching the limiting protrusion is provided on the inner wall of the sliding cavity; when the compression spring is in a natural state, the limiting protrusions respectively abut against the end faces of the limiting cavity, and one end of the clamping block extends into the card slot; for this end of the clamping block extending into the card slot, driving guide surfaces are provided on the two side surfaces of the clamping block corresponding to the direction of the limiting rod inserting into the card slot and the direction opposite to the limiting rod inserting into the card slot. The driving guide surfaces are arc surfaces or inclined surfaces. When the limiting rod is inserted into the card slot or the limiting rod disengages from the card slot, the contact between the limiting rod and the driving guide surface can squeeze the clamping block to retract into the sliding cavity.

[0014] For the purpose of making the structure more reliable, a further preferred solution is that the upper and lower adjacent counterweight blocks form a clamping and positioning fit through a positioning boss and a positioning slot.

[0015] The beneficial effects of the present invention are as follows: By the gravity of the counterweight assembly and using the cable to pull the skateboard downward, the cable is kept in a taut state, avoiding large-scale sagging of the cable. At the same time, through the pulley group structure composed of pulley A, pulley B, pulley C, and pulley D, the pulling force received by the skateboard can be several times the gravity of the counterweight assembly, that is, with a relatively light counterweight assembly, a large downward pulling force can be achieved on the skateboard and the cable. That is to say, while ensuring the pulling force on the cable, the weight of the counterweight assembly can be reduced, so as to reduce the load on the pole tower and improve the service life of the pole tower.

[0016] In the specific implementation process, the cable is pulled downward by the gravity of the counterweight assembly. Due to the nature of the cable's own thermal expansion and contraction, when the temperature is high, the cable elongates. At this time, the counterweight assembly moves downward to keep the cable in a taut state to avoid cable slack. In addition, when the temperature is low, the cable contracts. When the contraction force is large, that is, when the contraction force of the cable is greater than the vertical pressure exerted on the cable by the counterweight assembly for the pulling wheel, the counterweight assembly moves upward to avoid the phenomenon that the cable is too taut, and to avoid excessive force on the top of the pole tower, which affects its service life. The present invention can keep the cable in a reasonable taut state when the temperature is high or low, avoid large-scale sagging or excessive tautness of the cable, and the self-adaptive adjustment is realized by the counterweight assembly, without additional driving mechanisms and control systems, greatly improving the convenience of operation and implementation.

[0017] In the present invention, by arranging a plurality of detachable counterweight blocks in the counterweight assembly, it is convenient to adjust the gravity of the counterweight assembly itself according to the force conditions during the implementation process, and it is also convenient to clamp the counterweight blocks inside the box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structure schematic diagram of the present invention;

[0019] Figure 2 is a front view structure schematic diagram of the present invention;

[0020] Figure 3 is a three-dimensional structure schematic diagram of the top of the pole tower in the present invention;

[0021] Figure 4 is a three-dimensional structure schematic diagram of the tension automatic adjustment mechanism in the present invention Figure 1 ;

[0022] Figure 5 is a front cross-sectional view of pulley A, pulley B, pulley C, and pulley D in the present invention;

[0023] Figure 6 is a three-dimensional structure schematic diagram of the tension automatic adjustment mechanism in the present invention Figure 2 ;

[0024] Figure 7Schematic three-dimensional structure diagram of the counterweight assembly in the present invention;

[0025] Figure 8 Schematic three-dimensional structure diagram of the counterweight block in the present invention;

[0026] Figure 9 Schematic top sectional structure diagram of the counterweight block in the present invention.

[0027] In the figure, the markings are: 1, pole tower frame; 2, bracket; 3, limit wheel; 4, slide rail; 5, slide plate; 6, rotating shaft; 7, pulley A; 8, pulling wheel; 9, pulley B; 10, fixing plate; 11, pulley C; 12, pulley D; 13, cable; 14, counterweight assembly; 141, box body; 142, limit rod; 143, counterweight block; 1431, card slot; 1432, sliding cavity; 1433, card block; 1434, compression spring; 1435, positioning boss; 15, slide bar; 16, cable. Detailed implementation manners

[0028] The present invention will be further described below with reference to the accompanying drawings. It should be noted that the definitions of the front, back, left, right and other orientations in the present invention are only for facilitating the understanding of the technical solution.

[0029] As Figures 1 to 6 shown, the present invention includes a pole tower frame 1 and a cable 16. A set of limit wheels 3 are respectively installed on the front side and the rear side of the top of the pole tower frame 1 through brackets 2. Each set of limit wheels 3 includes a first limit wheel arranged on the left side of the pole tower frame 1 and a second limit wheel arranged on the right side of the pole tower frame 1. The first limit wheel and the second limit wheel are used for rolling support of the cable 16 (that is, the limit wheel 3 is rotatably arranged). The limit wheel 3 can be understood in a broad sense. Generally, the cable 16 can be directly clamped in the annular groove of the limit wheel 3. Of course, reference can also be made to the prior art and tensioning rollers arranged at intervals can be used to realize the rolling support of the cable 16. The bracket 2 only needs to provide a supporting effect for the limit wheel 3 and install the limit wheel 3 at the designed position.

[0030] A tension automatic adjustment mechanism for adjusting the tension of the cable 16 is respectively arranged corresponding between each set of the first limit wheel and the second limit wheel, that is, a tension automatic adjustment mechanism is respectively arranged on the front side and the rear side of the pole tower frame 1.

[0031] The tension automatic adjustment mechanism includes a slide plate 5 and a fixing plate 10. A vertically arranged slide rail 4 is arranged on the side surface of the pole tower frame 1. The slide plate 5 is slidably connected to the side surface of the pole tower frame 1 through the slide rail 4. The vertical arrangement of the slide rail 4 means that the moving direction of the slide plate 5 is vertically arranged. The slide rail 4 can be understood in a broad sense as long as it can provide a sliding guiding effect for the slide plate 5. In this embodiment, it is preferably in the form of directly opening a chute on the side surface of the pole tower frame 1. In some alternative embodiments, the slide rail 4 can also be an external independent component.

[0032] A rotating shaft 6 is fixed to the top of the skateboard 5. A pulley A 7 and a pulling wheel 8 arranged coaxially are rotatably sleeved on the rotating shaft 6. The pulley groove of the pulling wheel 8 is clamped above the cable 16, that is, the cable 16 is equivalent to being arranged in the pulley groove at the bottom of the pulling wheel 8. The cable 16 forms a rolling fit with the pulling wheel 8, and the pressure applied by the pulling wheel 8 to the cable 16 is downward from top to bottom. A pulley B 9 is rotatably installed at the bottom end of the skateboard 5; a fixing plate 10 is fixedly arranged on the side of the pole tower 1 and in the area below the vertical slide rail 4. A pulley C 11 is rotatably installed at the top of the fixing plate 10, and a pulley D 12 is rotatably installed at the bottom of the fixing plate 10. A cable 13 is fixed to the bottom end of the skateboard 5. One end of the cable 13 away from the skateboard 5 sequentially bypasses the pulley C 11, the pulley B 9, the pulley D 12 and the pulley A 7, and extends below the fixing plate 10 and then is connected with a counterweight assembly 14. The axes of the pulley A 7, the pulling wheel 8, the pulley B 9, the pulley C 11, the pulley D 12 and the limiting wheel 3 are all horizontally arranged along the front-back direction. The pulley group formed by the pulley A 7, the pulley B 9, the pulley C 11 and the pulley D 12 makes the vertical pressure applied by the pulling wheel 8 to the cable 16 greater than the gravity of the counterweight assembly 14 itself. The specific multiple of the gravity can be flexibly designed according to the actual situation. The pulling force received by the skateboard 5 is several times the gravity of the counterweight assembly 14, that is, only a relatively light counterweight assembly 14 can achieve a relatively large downward pulling force on the skateboard 5 and the cable 16. That is to say, while ensuring the pulling force on the cable 16, the weight of the counterweight assembly 14 required can be reduced to reduce the load on the pole tower 1 and improve the service life of the pole tower 1.

[0033] The design principle of the present invention is that the cable 16 is pulled downward by the gravity of the counterweight assembly 14. Due to the property of thermal expansion and contraction of the cable 16 itself, when the temperature is relatively high, the cable 16 elongates. At this time, the counterweight assembly 14 moves downward to keep the cable 16 in a taut state to avoid the cable 16 from being slack. In addition, when the temperature is relatively low, the cable 16 contracts. When the contraction force is relatively large, that is, when the contraction force of the cable 16 is greater than the downward pulling force received by the skateboard 5 and the cable 16, the counterweight assembly 14 moves upward to avoid the cable 16 from being overly taut and avoid the top of the pole tower 1 from being subjected to a large force and affecting its service life. In summary, the present invention can keep the cable 16 in a reasonable taut state when the temperature is relatively high or low, and avoid the cable 16 from dropping significantly or being overly taut.

[0034] In some preferred embodiments, the pulley B 9, the pulley C 11 and the pulley D 12 are all directly below the pulley A 7, and the diameter value of the pulley B 9 = the diameter value of the pulley C 11 < the diameter value of the pulley D 12 < the diameter value of the pulley A 7. In this way, a relatively more reasonable pulley group structure can be formed, and the friction received by the cable 13 can be reduced.

[0035] In some preferred embodiments, in the horizontal direction, the pulling wheel 8 is disposed at the exact middle position between the first limiting wheel and the second limiting wheel. That is, the vertical distance in the horizontal direction between the axis line of the pulling wheel 8 and the axis line of the first limiting wheel is equal to the vertical distance in the horizontal direction between the axis line of the pulling wheel 8 and the axis line of the second limiting wheel. This can make the overall force more balanced.

[0036] In some preferred embodiments, the materials of the limiting wheel 3, the pulley A 7, the pulling wheel 8, the pulley B 9, the pulley C 11 and the pulley D 12 are all ceramic materials. It can be understood that the specific strength of the selected ceramic material should meet the design requirements. The overall components are made of ceramic materials, which is more convenient to implement and can effectively ensure the insulation effect between the cable 16 and the pole tower 1.

[0037] Further referring to Figures 7 to 9 , in some preferred embodiments, the counterweight assembly 14 includes a box body 141 and a plurality of counterweight blocks 143. A vertically arranged limiting rod 142 is fixedly connected inside the box body 141. The counterweight blocks 143 are clamped inside the box body 141 through the limiting rod 142. The side surface of the counterweight block 143 has a card slot 1431 for the limiting rod 142 to be inserted. The counterweight blocks 143 are clamped inside the box body 141 through the limiting rod 142, which can better ensure the structural safety and prevent the counterweight blocks 143 from accidentally falling. At the same time, the counterweight blocks 143 are arranged in a clamping manner, which can also facilitate adjusting the self-gravity of the counterweight assembly 14 by adding or replacing the counterweight blocks 143 according to the force condition during the implementation process. It can be understood that in some alternative embodiments, the counterweight blocks 143 can also be directly connected to the cable 13 through connecting members such as sling rings. In some other alternative embodiments, the counterweight blocks 143 can also be directly supported and fixed by a support bottom plate, and limiting rods 142 can also be added to the support bottom plate to clamp a plurality of counterweight blocks 143.

[0038] In some preferred embodiments, a vertically arranged sliding rod 15 is fixedly provided on the side surface of the pole tower 1. The box body 141 is slidably arranged on the side surface of the pole tower 1 through the sliding rod 15, which can ensure that the counterweight assembly 14 can move up and down more smoothly. It can be understood that in some alternative embodiments, the counterweight assembly 14 can also be directly suspended.

[0039] In some preferred embodiments, there are two limiting rods 142 arranged in parallel, and each counterweight block 143 has a card slot 1431 corresponding to the limiting rod 142 one by one, so as to further improve the reliability of the guiding structure.

[0040] In some preferred embodiments, a sliding cavity 1432 communicating with two card slots 1431 is formed inside the counterweight block 143. Two clamping blocks 1433 are slidably connected inside the sliding cavity 1432, and the two clamping blocks 1433 are respectively located at both ends of the sliding cavity 1432. A compression spring 1434 is arranged inside the sliding cavity 1432, and the compression spring 1434 is located between the two clamping blocks 1433; a limiting protrusion is provided on the side surface of each clamping block 1433, and a limiting cavity matching the limiting protrusion is provided on the inner wall of the sliding cavity 1432; when the compression spring 1434 is in a natural state, the limiting protrusions respectively abut against the end faces of the limiting cavity, and one end of the clamping block 1433 extends into the card slot 1431; for the end of the clamping block 1433 extending into the card slot 1431, driving guide surfaces are provided on the two side surfaces of the clamping block 1433 corresponding to the direction facing the insertion of the limiting rod 142 into the card slot 1431 and the direction away from the insertion of the limiting rod 142 into the card slot 1431. The driving guide surface is an arc surface or an inclined surface. When the limiting rod 142 is inserted into the card slot 1431 or the limiting rod 142 disengages from the card slot 1431, the contact between the limiting rod 142 and the driving guide surface can squeeze the clamping block 1433 to retract into the sliding cavity 1432. After the limiting rod 142 is inserted in place or the limiting rod 142 completely disengages from the card slot 1431, under the reset elastic force of the compression spring 1434, the clamping block 1433 returns to its initial state (that is, the limiting protrusions on the side surface of the clamping block 1433 respectively abut against the end faces of the limiting cavity, and one end of the clamping block 1433 extends into the card slot 1431). After adopting the above structure, when the counterweight block 143 is clamped inside the box body 141, the two card slots 1431 of the counterweight block 143 are respectively clamped outside the two limiting rods 142, and at the same time, the compression spring 1434 is used to push the two clamping blocks 1433 to be clamped outside the two limiting rods 142, so that the counterweight block 143 can be clamped inside the box body 141. The clamping block 1433 can play a role in limiting the limiting rod 142, preventing the limiting rod 142 from disengaging from the card slot 1431, and better ensuring the structural safety.

[0041] In some preferred embodiments, two adjacent counterweight blocks 143 are engaged and positioned by a positioning boss 1435 and a positioning slot, which facilitates the installation of multiple counterweight blocks 143 inside the box body 141 and ensures the stability of multiple counterweight blocks 143 inside the box body 141. In a preferred embodiment, a positioning boss 1435 is provided on the upper surface of each counterweight block 143, and a positioning slot corresponding to the positioning boss 1435 is provided on the bottom surface of the counterweight block 143. In some alternative embodiments, a positioning boss 1435 may also be provided on the lower surface of each counterweight block 143, and a positioning slot corresponding to the positioning boss 1435 is provided on the top surface of the counterweight block 143. In this embodiment, a positioning slot corresponding to the positioning boss 1435 needs to be additionally provided on the upper surface of the bottom plate of the box body 141. In some other alternative embodiments, the bottom surface of the lowermost counterweight block 143 may be designed to be horizontal, and only a positioning slot is provided on the top surface, while the other counterweight blocks 143 are provided with a positioning boss 1435 on the lower surface and a positioning slot corresponding to the positioning boss 1435 on the top surface.

[0042] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

Claims

1. Cable tension adjusting device on a power transmission tower, comprising a tower frame (1) and a cable (16). A set of limit wheels (3) are respectively installed on the front side and the rear side of the top of the tower frame (1) through brackets (2). Each set of limit wheels (3) includes a first limit wheel arranged on the left side of the tower frame (1) and a second limit wheel arranged on the right side of the tower frame (1). The first limit wheel and the second limit wheel are used for rolling support of the cable (16). A tension automatic adjusting mechanism for adjusting the tension of the cable (16) is respectively arranged corresponding to each set of the first limit wheel and the second limit wheel. It is characterized in that: The tension automatic adjustment mechanism includes a sliding plate (5) and a fixing plate (10). A vertically arranged slide rail (4) is provided on the side of the pole tower frame (1). The sliding plate (5) is slidably connected to the side of the pole tower frame (1) through the slide rail (4). A rotating shaft (6) is fixed to the top of the sliding plate (5). A pulley A (7) and a pulling wheel (8) arranged coaxially are rotatably sleeved on the rotating shaft (6). The pulley groove of the pulling wheel (8) is clamped above the cable (16). A pulley B (9) is rotatably installed at the bottom end of the sliding plate (5). The fixing plate (10) is fixedly arranged on the side of the pole tower frame (1) and in the lower area of the vertical slide rail (4). A pulley C (11) is rotatably installed at the top of the fixing plate (10), and a pulley D (12) is rotatably installed at the bottom of the fixing plate (10). A cable (13) is fixed to the bottom end of the sliding plate (5). One end of the cable (13) away from the sliding plate (5) sequentially bypasses the pulley C (11), the pulley B (9), the pulley D (12), and the pulley A (7), and extends below the fixing plate (10) and then is connected to a counterweight assembly (14). The axes of the pulley A (7), the pulling wheel (8), the pulley B (9), the pulley C (11), the pulley D (12), and the limiting wheel (3) are all horizontally arranged along the front-back direction. The pulley group composed of the pulley A (7), the pulley B (9), the pulley C (11), and the pulley D (12) makes the vertical pressure exerted by the pulling wheel (8) on the cable (16) greater than the self-weight of the counterweight assembly (14).

2. The cable tension adjusting device on the power transmission tower according to claim 1, characterized in that: The pulley B (9), the pulley C (11), and the pulley D (12) are all directly below the pulley A (7). The diameter value of the pulley B (9) = the diameter value of the pulley C (11) < the diameter value of the pulley D (12) < the diameter value of the pulley A (7).

3. The cable tension adjusting device on the power pole tower according to claim 1, wherein: In the horizontal direction, the pulling wheel (8) is arranged at the middle position between the first limiting wheel and the second limiting wheel.

4. The cable tension adjusting device on the power transmission tower according to claim 1, characterized in that: The materials of the limiting wheel (3), the pulley A (7), the pulling wheel (8), the pulley B (9), the pulley C (11), and the pulley D (12) are all ceramic materials.

5. The cable tension adjusting device on the power pole tower according to any one of claims 1 to 4, characterized in that: The counterweight assembly (14) includes a box body (141) and a plurality of counterweight blocks (143). A vertically arranged limiting rod (142) is fixedly connected inside the box body (141). The counterweight blocks (143) are clamped inside the box body (141) through the limiting rod (142). The side surface of the counterweight block (143) has a card slot (1431) for the limiting rod (142) to be inserted into.

6. The cable tension adjusting device on the power pole tower according to claim 5, characterized in that: A vertically arranged sliding rod (15) is fixedly arranged on the side of the pole tower frame (1). The box body (141) is slidably arranged on the side of the pole tower frame (1) through the sliding rod (15).

7. The cable tension adjusting device on the power pole tower according to claim 5, characterized in that: The limiting rods (142) are two arranged in parallel, and each counterweight block (143) has a card slot (1431) corresponding to the limiting rod (142) one by one.

8. The cable tension adjusting device on the power pole tower according to claim 7, wherein: A sliding cavity (1432) communicating with two clamping grooves (1431) is formed inside the counterweight block (143). Two clamping blocks (1433) are slidably connected inside the sliding cavity (1432), and the two clamping blocks (1433) are respectively located at two ends of the sliding cavity (1432). A compression spring (1434) is arranged inside the sliding cavity (1432), and the compression spring (1434) is located between the two clamping blocks (1433); a limiting protrusion is provided on the side surface of each clamping block (1433), and a limiting cavity matching with the limiting protrusion is provided on the inner wall of the sliding cavity (1432); when the compression spring (1434) is in a natural state, the limiting protrusions respectively abut against the end faces of the limiting cavity, and one end of the clamping block (1433) extends into the clamping groove (1431); for the end of the clamping block (1433) extending into the clamping groove (1431), driving guide surfaces are provided on the two side surfaces of the clamping block (1433) corresponding to the direction facing the limiting rod (142) inserted into the clamping groove (1431) and the direction facing away from the limiting rod (142) inserted into the clamping groove (1431). The driving guide surface is an arc surface or an inclined surface. When the limiting rod (142) is inserted into the clamping groove (1431) or the limiting rod (142) disengages from the clamping groove (1431), the contact between the limiting rod (142) and the driving guide surface can squeeze the clamping block (1433) to retract into the sliding cavity (1432).

9. The cable tension adjusting device on the power pole tower according to claim 5, characterized in that: Two adjacent upper and lower counterweight blocks (143) are in clamping and positioning cooperation through a positioning boss (1435) and a positioning slot.

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