High-voltage cable mounting rack capable of automatically loosening and tightening

Abstract

The high-voltage cable mounting rack capable of automatically loosening and tightening comprises a power transmission tower, a cantilever support is arranged at the upper end of the power transmission tower, and a loosening and tightening adjusting mechanism is arranged on the cantilever support; the tightness adjusting mechanism comprises a sliding guide rail arranged on the cantilever support, a movable pulley is slidably connected into the sliding guide rail and slides in the length direction of the high-voltage cable, a fixed pulley is rotatably connected to the cantilever support, and a steel wire rope is fixedly connected to one end of the connecting piece. The steel wire rope extends from the connecting piece, sequentially surrounds the outer edges of the fixed pulley and the movable pulley and then extends out of the outer edge of the movable pulley; through the arrangement of the fixed pulley, the movable pulley and the steel wire rope, the output force of the telescopic mechanism in the high-voltage cable tightness adjusting process can be remarkably reduced, energy loss is reduced, mechanical equipment with high output power does not need to be selected, and the positive effects on cost control and installation of machines and power transmission towers are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of high - voltage power transmission, and specifically relates to a high - voltage cable mounting bracket with automatic tension adjustment. Background Technique

[0002] If the overhead of the high - voltage cable between two transmission towers is too loose, it will cause the excessive sag in the middle of the cable in this section, and then increase the cable laying length between the two transmission towers. When the cable is fixed to the transmission tower, its tightness needs to be adjusted to reduce the sag in the middle of the cable. However, the cable itself will expand and contract due to the influence of environmental temperature. In summer, the cable expands due to the high environmental temperature, causing the length of the cable between the two transmission towers to elongate, and the sag of the cable will increase. On the contrary, in winter, the cable contracts due to low temperature, and the sag of the cable decreases. In order to control the tightness of the cable within a reasonable range all the time, the tightness of the high - voltage cable needs to be adjusted in real time.

[0003] The existing devices for adjusting the tightness of high - voltage cables mostly add several counterweights greater than the weight of the cable at both ends of the cable, and straighten the cable by the gravity of the counterweights. When the length of the high - voltage cable is too long, the self - weight of the high - voltage cable is large, and the effect of straightening the cable in this way is not obvious, and more counterweights need to be installed, the operation is cumbersome, and the counterweights will also increase the load of the transmission tower. Content of the Utility Model

[0004] To solve the above problems, the utility model provides a high - voltage cable mounting bracket with automatic tension adjustment.

[0005] The technical solution of the utility model is as follows:

[0006] A high - voltage cable mounting bracket with automatic tension adjustment, including a transmission tower, an overhanging bracket is provided at the upper end of the transmission tower, and a tension adjustment mechanism is provided on the overhanging bracket;

[0007] The tension adjustment mechanism includes a sliding guide rail arranged on the overhanging bracket, a movable pulley is slidably connected in the sliding guide rail, the movable pulley slides along the length direction of the high - voltage cable, and a connecting piece is rotatably connected to the center of the movable pulley;

[0008] A fixed pulley is rotatably connected to the overhanging bracket, one end of the connecting piece is fixedly connected with a steel wire rope, the steel wire rope extends from the connecting piece and successively winds around the outer edges of the fixed pulley and the movable pulley and then extends out from the outer edge of the movable pulley. An expansion mechanism is provided on the transmission tower, the expansion end of the expansion mechanism is fixed to the end of the steel wire rope far from the connecting piece, and a connecting part for connecting the high - voltage cable is provided on the connecting piece.

[0009] In order to adjust the tightness of multiple high-voltage cables installed on a transmission tower simultaneously, rotating shafts are symmetrically and fixedly connected to the outer sides of both ends of the connecting arm. A connecting plate is rotatably connected to the rotating shafts. A connecting hole is provided at the upper end of the connecting plate. Connecting cables are fixed between the two connecting holes and the connecting member.

[0010] In order to improve the stability of the connecting arm and prevent the connecting arm from deflecting laterally under the action of external forces, rotating shafts are symmetrically and fixedly connected to the outer sides of both ends of the connecting arm. A connecting plate is rotatably connected to the rotating shafts. A connecting hole is provided at the upper end of the connecting plate. Connecting cables are fixed between the two connecting holes and the connecting member.

[0011] In order to make the high-voltage cable parallel to the sliding direction of the moving pulley and reduce the force loss, the extending direction of the cantilever frame is arranged parallel to the length direction of the high-voltage cable.

[0012] In order to shorten the contraction stroke of a single tightness adjustment mechanism, two cantilever frames and the tightness adjustment mechanisms on the cantilever frames are symmetrically arranged.

[0013] In order to facilitate the connection and fixation of the moving pulley with the steel wire rope and the connecting part, the connecting member includes a rotating shaft that rotates coaxially with the moving pulley. A connecting rod is fixedly connected to the rotating shaft. One end of the connecting rod is fixed to the steel wire rope, and the other end of the connecting rod is hinged to the connecting part.

[0014] In order to facilitate the stable connection of the high-voltage cable, the connecting part includes a fixed block, and a fastener for fixing the high-voltage cable is provided at the lower end of the fixed block.

[0015] In order to facilitate guiding the end of the steel wire rope to be in the same straight line as the telescopic direction of the telescopic end of the telescopic mechanism, a guide pulley is rotatably connected to the upper end of the transmission tower. After the steel wire rope extends out from the outer edge of the automatic pulley, it passes through the guide pulley from top to bottom and is fixed to the telescopic end of the telescopic mechanism.

[0016] In order to realize the control of the retraction and extension of the steel wire rope, the telescopic mechanism includes a hydraulic telescopic rod. The fixed end of the hydraulic telescopic rod is fixed to the transmission tower, and the telescopic end of the hydraulic telescopic rod is fixed to the steel wire rope.

[0017] In order to avoid short circuits caused by the contact between the steel wire rope and multiple high-voltage cables arranged at intervals, an insulating layer is wrapped around the steel wire rope.

[0018] The beneficial effects of the present utility model are as follows:

[0019] 1. The utility model relates to a high-voltage cable mounting bracket with automatic tension adjustment. By setting up a fixed pulley, a movable pulley and a steel wire rope, the force output during the tension adjustment of the high-voltage cable can be significantly reduced. When staff assemble the mechanical equipment for tension output, they do not need to select mechanical equipment with a higher output power, which has a positive effect on cost control and the installation of the machine and the transmission tower. The specific mechanical equipment for tension output is a telescopic mechanism. By controlling the extension of the telescopic end of the telescopic mechanism, the movable pulley slides to the right, reducing the tension of the high-voltage cable. On the contrary, by controlling the retraction of the telescopic end of the telescopic mechanism, the movable pulley slides to the left, pulling the high-voltage cable to be tightened.

[0020] 2. Through the settings of the connecting arm, the connecting block, the wire-passing hole and the tightening bolt, multiple high-voltage cables installed on the transmission tower can be connected simultaneously, so as to synchronously adjust the tension of multiple high-voltage cables. And through the spaced connecting blocks, a safe distance can be maintained between multiple high-voltage cables, preventing contact and interference between the high-voltage cables. Through the setting of the hinge rod, the angle of the connecting arm can be adaptively adjusted according to the force change and position change, eliminating the stress of the connecting arm.

[0021] 3. When the sag of the high-voltage cable section fixed by two transmission tower brackets is relatively large, the tension adjustment mechanism on the adjacent cantilever frames between two adjacent transmission towers applies tension to both ends of the high-voltage cable section simultaneously, increasing the efficiency of adjusting the high-voltage cable and reducing the displacement of the output end of the single-side tension adjustment mechanism.

[0022] 4. Through the setting of the guide pulley, it is convenient to guide the steel wire rope, eliminating the angle between the steel wire rope and the telescopic end of the telescopic mechanism, and thus reducing the horizontal component force of the tension applied by the telescopic mechanism to the steel wire rope.

[0023] 5. Through the setting of the reinforcing plate, it is convenient to strengthen the structure of the cantilever frame and increase the bearing capacity of the cantilever frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By reading the detailed description of the preferred embodiments below, the solutions and advantages of this application will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the utility model.

[0025] In the drawings:

[0026] Figure 1 is a schematic structural diagram of the utility model;

[0027] Figure 2 is the utility model Figure 1 partial enlarged view of part A;

[0028] Figure 3 is a schematic structural diagram of the connecting part of the utility model;

[0029] The components represented by the reference numerals in the figure are as follows:

[0030] 1. Transmission tower; 2. Cantilever frame; 21. Reinforcing plate; 3. Sliding guide rail; 4. Guide wheel; 41. Steel wire rope; 5. Fixed pulley; 6. Movable pulley; 61. Connecting rod; 62. Connecting part; 621. Connecting arm; 622. Connecting block; 623. Threading hole; 624. Tightening bolt; 625. Rotating shaft; 626. Connecting plate; 627. Connecting hole; 7. High-voltage cable; 8. Hydraulic telescopic rod. Specific embodiments

[0031] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted that these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. The present disclosure can be implemented in various forms and should not be limited by the embodiments described herein.

[0032] Embodiment

[0033] Referring to Figures 1-3 , an automatic tensioning and loosening high-voltage cable mounting rack includes a transmission tower 1. A cantilever frame 2 is provided at the upper end of the transmission tower 1. A tensioning and loosening adjustment mechanism is provided on the cantilever frame 2. The tensioning and loosening adjustment mechanism includes a sliding guide rail 3 provided on the cantilever frame 2. A movable pulley 6 is slidably connected in the sliding guide rail 3. The movable pulley 6 slides along the length direction of the high-voltage cable 7. A connecting member is rotatably connected to the center of the movable pulley 6. A fixed pulley 5 is rotatably connected to the cantilever frame 2. One end of the connecting member is fixedly connected to a steel wire rope 41. The steel wire rope 41 extends from the connecting member and successively winds around the outer edges of the fixed pulley 5 and the movable pulley 6 and then extends out from the outer edge of the movable pulley 6. A telescopic mechanism is provided on the transmission tower 1. The telescopic end of the telescopic mechanism is fixedly connected to the end of the steel wire rope 41 away from the connecting member. A connecting part 62 for connecting the high-voltage cable 7 is provided on the connecting member.

[0034] Those skilled in the art can understand that a fixing device for fixing the high-voltage cable 7 is provided on the transmission tower 1. The length direction of the high-voltage cable 7 is parallel to the extending direction of the cantilever frame 2. Through this design, the included angle between the movable pulley 6 and the high-voltage cable 7 in the horizontal direction is reduced, and the force required to pull the high-voltage cable 7 tight is reduced. Under the action of its own gravity, the high-voltage cable 7 exerts a pulling force on the movable pulley 6 through the connecting member. The movable pulley 6 divides the pulling force equally among each section of the steel wire rope 41 that exerts a pulling force on the movable pulley 6, so as to Figure 2For example, through force analysis, it is obtained that when pulling the movable pulley 6 to slide along the sliding guide 3, three steel wire ropes 41 apply tensile forces to the movable pulley 6. Let the horizontal component of the force applied by the high-voltage cable 7 to the movable pulley 6 be G. When it is necessary to pull the high-voltage cable 7 to be tightened, only 1 / 3G needs to be applied to the end of the steel wire rope 41, significantly reducing the force output during the tension adjustment process of the high-voltage cable 7. When staff assemble the mechanical device for tensile force output, they can choose mechanical equipment with a relatively low output power, which has a positive effect on cost control and the installation of the mechanical device and the transmission tower 1. The specific mechanical device for tensile force output is a telescopic mechanism. By controlling the telescopic end of the telescopic mechanism to extend, the movable pulley 6 slides to the right, reducing the tension of the high-voltage cable 7. On the contrary, by controlling the telescopic end of the telescopic mechanism to retract, the movable pulley 6 slides to the left, pulling the high-voltage cable 7 to be tightened.

[0035] It should be reminded that in order to prevent the steel wire rope 41 from contacting multiple high-voltage cables 7 arranged at intervals and causing a short circuit, the outside of the steel wire rope 41 is wrapped with an insulating layer.

[0036] As a preferred implementation manner of the connecting portion 62, referring to Figure 3 , the connecting portion 62 includes a connecting arm 621. The length direction of the connecting arm 621 is perpendicular to the length direction of the high-voltage cable 7. A number of connecting blocks 622 with the same number as the high-voltage cables 7 are arranged at intervals below the connecting arm 621. A wire passing hole 623 is provided in the connecting block 622. A tightening bolt 624 penetrating into the wire passing hole 623 is threadedly connected to the side wall of the connecting block 622. The settings of the connecting arm 621, the connecting blocks 622, the wire passing holes 623, and the tightening bolts 624 can connect multiple high-voltage cables 7 installed on the transmission tower 1 at the same time, facilitating the synchronous adjustment of the tightness of multiple high-voltage cables 7. Moreover, the spaced connecting blocks 622 can keep a safe distance between multiple high-voltage cables 7, preventing contact and interference between high-voltage cables 7.

[0037] Furthermore, symmetrically fixed to the outer sides of both ends of the connecting arm 621 are rotating shafts 625. A connecting plate 626 is rotatably connected to the rotating shafts 625. A connecting hole 627 is provided at the upper end of the connecting plate 626. Connecting cables are fixed between each of the two connecting holes 627 and the connecting member. Through the settings of the rotating shafts 625 and the connecting plates 626, the angle of the connecting arm 621 can be adaptively adjusted according to the change in the force direction during the movement of the high-voltage cable 7, eliminating the stress of the connecting arm 621. At the same time, it is also beneficial to prevent the connecting arm 621 from laterally shifting during the movement.

[0038] The present application does not limit the specific implementation manner of the telescopic mechanism, and it can adopt any one of the following implementation manners:

[0039] Embodiment 1, the telescopic mechanism includes a hydraulic telescopic rod 8. The fixed end of the hydraulic telescopic rod 8 is fixed to the transmission tower 1, and the telescopic end of the hydraulic telescopic rod 8 is fixed to the steel wire rope 41. The hydraulic telescopic rod 8.

[0040] Embodiment 2, the telescopic mechanism includes a vertical hydraulic tension machine. The tension output end of the vertical hydraulic tension machine is fixed to the steel wire rope 41.

[0041] It should be noted that both the hydraulic telescopic rod 8 and the vertical hydraulic tension machine are common commercially available products and are mature existing technologies. Those skilled in the art can flexibly select a hydraulic telescopic rod 8 or a vertical hydraulic tension machine with a matching output power according to the magnitude of the force required to pull the high-voltage cable 7, and no further elaboration will be made here.

[0042] It should be noted that referring to Figure 1 , two cantilever frames 2 and the tension adjustment mechanisms on the cantilever frames 2 are symmetrically arranged. When the sag of the high-voltage cable 7 section fixed by the two transmission tower 1 brackets is relatively large, the tension adjustment mechanisms on the adjacent cantilever frames 2 between two adjacent transmission towers 1 apply tension to both ends of the high-voltage cable 7 in this section simultaneously, increasing the efficiency of adjusting the high-voltage cable 7 and reducing the displacement of the output end of the single-side tension adjustment mechanism.

[0043] As a specific embodiment of the connecting member, referring to Figure 2 , the connecting member includes a rotating shaft that rotates coaxially with the movable pulley 6. A connecting rod 61 is fixedly connected to the rotating shaft. One end of the connecting rod 61 is fixed to the steel wire rope 41, and the other end of the connecting rod 61 is hinged to the connecting portion 62.

[0044] Referring to Figure 1 and Figure 2 , a guide wheel 4 is rotatably connected to the upper end of the transmission tower 1. After the steel wire rope 41 extends out from the outer edge of the movable pulley 6, it passes through the guide wheel 4 from top to bottom and is fixed to the telescopic end of the telescopic mechanism. The setting of the guide wheel 4 facilitates guiding the steel wire rope 41, eliminating the angle between the steel wire rope 41 and the telescopic end of the telescopic mechanism, and thus reducing the horizontal component of the tension applied by the telescopic mechanism to the steel wire rope 41.

[0045] As a preferred embodiment of itself, referring to Figure 1 , a reinforcing plate 21 is fixedly connected between one end of the cantilever frame 2 away from the transmission tower 1 and the transmission tower 1. The setting of the reinforcing plate 21 facilitates strengthening the structure of the cantilever frame 2 and increasing the bearing capacity of the cantilever frame 2.

Claims

1. An automatic tightening and loosening high-voltage cable mounting frame, arranged on a transmission tower (1), wherein a plurality of high-voltage cables (7) are arranged at intervals on the transmission tower (1), characterized in that: It comprises a cantilever frame (2) arranged at the upper end of the transmission tower (1), and a tension adjustment mechanism is provided on the cantilever frame (2); The tension adjustment mechanism comprises a sliding guide rail (3) connected to the cantilever frame (2), the sliding guide rail (3) being slidably connected to a movable pulley (6), the movable pulley (6) being able to slide along the length direction of the high-voltage cable (7), and a connecting piece being rotatably connected to the axis of the movable pulley (6); A fixed pulley (5) is rotatably connected to the cantilever frame (2); a steel wire rope (41) is fixedly connected to one end of the connecting member; an end of the steel wire rope (41) extends from the connecting member and passes through the fixed pulley (5) and the movable pulley (6) in sequence before being connected to the telescopic end of the telescopic mechanism on the transmission tower (1); a connecting portion (62) for connecting a plurality of high-voltage cables (7) is provided below the connecting member.

2. The automatic tightening and loosening high-voltage cable installation frame according to claim 1, characterized in that: The connecting portion (62) comprises a connecting arm (621), the length direction of the connecting arm (621) is perpendicular to the length direction of the high-voltage cable (7), a plurality of connecting blocks (622) whose number is the same as the number of the high-voltage cables (7) are arranged at intervals below the connecting arm (621), a threading hole (623) is arranged in the connecting block (622), and a tightening bolt (624) that penetrates the threading hole (623) is threadedly connected to the side wall of the connecting block (622).

3. The automatic tightening and loosening high-voltage cable installation frame according to claim 2, characterized in that: The outer sides of the two ends of the connecting arm (621) are symmetrically fixedly connected to the rotating shaft (625), and the rotating shaft (625) is rotatably connected to a connecting plate (626). The upper end of the connecting plate (626) is provided with a connecting hole (627), and connecting ropes are fixed between the two connecting holes (627) and the connecting member.

4. The automatic tightening and loosening high-voltage cable installation frame according to claim 1, characterized in that: The extension direction of the cantilever frame (2) is arranged parallel to the length direction of the high-voltage cable (7).

5. The automatic tightening and loosening high-voltage cable installation frame according to claim 2, characterized in that: The cantilever frame (2) and the tension adjustment mechanism on the cantilever frame (2) are both symmetrically arranged with two.

6. The automatic tightening and loosening high-voltage cable installation frame according to claim 1, characterized in that: The connecting member comprises a rotating shaft coaxially rotating with the movable pulley (6), a connecting rod (61) being fixedly connected to the rotating shaft, one end of the connecting rod (61) being fixed to the steel wire rope (41), and the other end of the connecting rod (61) being hinged to the connecting portion (62).

7. The automatic tightening and loosening high-voltage cable installation frame according to claim 1, characterized in that: The transmission tower (1) is rotatably connected to a guide wheel (4) at the upper end of the telescopic mechanism, and the steel wire rope (41) passes around the guide wheel (4) before connecting to the telescopic end of the telescopic mechanism.

8. The automatic tightening and loosening high-voltage cable installation frame according to claim 6, characterized in that: The telescopic mechanism comprises a hydraulic telescopic rod (8), the fixed end of the hydraulic telescopic rod (8) is fixed to the transmission tower (1), and the telescopic end of the hydraulic telescopic rod (8) is fixed to the steel wire rope (41).

9. The automatic tightening and loosening high-voltage cable installation frame according to claim 8, characterized in that: The steel wire rope (41) is externally wrapped with an insulating layer.

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