Concrete pole framework winding device

By adding a sliding displacement wire feeding and double-end clamping structure to the concrete pole skeleton winding device, the problems of long winding time and unstable clamping are solved, and efficient and stable winding operations are achieved. It is suitable for pole skeletons of various specifications.

CN223316208UActive Publication Date: 2025-09-09ZIYUN QIANGUAN POWER EQUIP CO LTD
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Patent Information

Application Number
CN202422506494.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-16
Publication Date
2025-09-09
Estimated Expiration
2034-10-16

AI Technical Summary

Technical Problem

The existing concrete pole skeleton winding operation is time-consuming, the mechanical clamping stability is poor, it is difficult to adapt to a variety of specifications, and manual wire feeding is dangerous and has high work risks.

Method used

The sliding displacement wire feeding structure and the double-end sliding adjustable clamping structure are added, combined with the rotary drive motor and arc-shaped bracket to achieve synchronous wire feeding and stable clamping, adapting to concrete pole skeletons of different sizes.

Benefits of technology

It reduces manual labor, shortens winding time, improves work progress, enhances clamping stability, reduces work risks, and is suitable for various specifications of pole frames.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a concrete pole framework winding device which comprises a bearing rack, sliding adjusting grooves are symmetrically formed in the two sides of the upper end of the bearing rack, and a bearing supporting column is fixedly installed in the middle of the upper end of the bearing rack. A first-stage clamping bearing plate is movably mounted at the upper end of the sliding adjusting groove in one side of the upper end of the bearing rack, and a second-stage clamping bearing plate is movably mounted at the upper end of the sliding adjusting groove in the other side of the upper end of the bearing rack. And positioning clamping discs are movably mounted in the middle positions of the inner sides of the first-stage clamping bearing plate and the second-stage clamping bearing plate correspondingly. According to the utility model, the wire feeding structure capable of sliding and displacing synchronously with the rotation operation of the framework is additionally arranged, so that the required manual labor force is effectively reduced, the time consumed by the winding operation is greatly reduced, and the whole work progress is accelerated.
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Description

Technical Field

[0001] The utility model relates to the technical field of concrete pole winding, in particular to a concrete pole skeleton winding device. Background Art

[0002] The winding operation of concrete poles is an indispensable and important processing link in the preparation process of concrete poles. Winding is to wrap steel wires of corresponding sizes around the concrete pole frame to reinforce its frame.

[0003] The existing concrete pole skeleton winding operations are mostly completed by mechanical rotation devices combined with manual wire feeding operations, which takes a long time. In addition, the clamping stability of the mechanical rotation device for the concrete pole skeleton is relatively general, and it is difficult to perform appropriate clamping and adjustment operations according to its specific size, so that it is impossible to achieve the use effect of winding operations for concrete pole skeletons of various specifications. At the same time, during the winding operation, due to the use of manual wire feeding operation mode, generally during the rotation of the skeleton, manual labor needs to move with the rotation to ensure the uniform winding of the steel wire on the skeleton, which poses certain dangers and high work risks.

[0004] Based on this, the present invention proposes a concrete pole skeleton winding device to solve the above problems. Utility Model Content

[0005] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and in the abstract and title of the present invention to avoid obscuring the purpose of this section, the abstract and the title of the utility model, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0006] In view of the above problems and / or the problems existing in the design of existing concrete pole winding devices, the present utility model is proposed.

[0007] Therefore, one of the purposes of the present invention is to provide a concrete pole skeleton winding device, which effectively reduces the required manual labor and greatly reduces the time required for winding operations by adding a wire feeding structure that can slide and displace synchronously with the skeleton rotation operation, thereby helping to speed up the overall work progress. Moreover, by adopting a double-end slidably adjustable clamping structure, the device as a whole can be appropriately adjusted according to the size of the pole skeleton to be processed, so as to achieve a stable positioning clamping effect.

[0008] To achieve the above-mentioned effect, the utility model provides the following technical solutions: a concrete pole skeleton winding device comprises a supporting frame, sliding adjustment grooves are symmetrically provided on both sides of the upper end of the supporting frame, a load-bearing pillar is fixedly installed at the middle position of the upper end of the supporting frame, a first-level clamping supporting plate is movably installed at the upper end position of the sliding adjustment groove on one side of the upper end of the supporting frame, and a second-level clamping supporting plate is movably installed at the upper end position of the sliding adjustment groove on the other side of the upper end of the supporting frame, a positioning clamping disk is movably installed at the middle position of the inner sides of the first-level clamping supporting plate and the second-level clamping supporting plate, a rotating drive motor is fixedly installed at the middle position of the outer side of the first-level clamping supporting plate, and the output shaft of the rotating drive motor passes through the first-level clamping supporting plate and is fixedly connected to the positioning clamping disk.

[0009] As a preferred solution of the concrete pole skeleton winding device of the utility model, wherein: the corner positions of the bottom of the carrying frame are symmetrically fixed with stable supporting feet, the side positions of the lower end of the outer side of the carrying frame are fixedly installed with a displacement drive motor, the lower end position of the outer side of the carrying frame is horizontally opened with a displacement adjustment groove, the displacement adjustment screw is movably installed inside the displacement adjustment groove, and the output shaft of the displacement drive motor passes through the displacement adjustment groove and is fixedly connected to the displacement adjustment screw;

[0010] As a preferred solution of the concrete pole skeleton winding device of the utility model, wherein: an arc-shaped bracket is fixedly installed on the upper end of the load-bearing pillar, and load-bearing rollers are movably installed in the interior of the arc-shaped bracket in an arc-shaped structure with equal intervals, and the height position of the arc-shaped bracket at the upper end of the load-bearing frame is at the same level as the height position of the first-level clamping load-bearing plate and the second-level clamping load-bearing plate at the upper end of the load-bearing frame;

[0011] By adding a mid-section support structure with an arc-shaped bracket and a load-bearing roller, the concrete pole skeleton to be wound can obtain a more stable support effect during the alignment and clamping operation.

[0012] As a preferred solution of the concrete pole skeleton winding device of the utility model, wherein: a sliding bracket is movably installed on the outside of the displacement adjustment groove, a receiving sliding block is fixedly installed on the bottom of the sliding bracket, the external specifications of the receiving sliding block correspond to the internal specifications of the displacement adjustment groove, the sliding bracket is connected to the displacement adjustment groove by sliding between the receiving sliding block, a threaded connection hole is opened through the middle position of the side of the receiving sliding block, and the internal thread specifications of the threaded connection hole correspond to the external thread specifications of the displacement adjustment screw;

[0013] By adding a sliding wire feeding structure with a sliding bracket, the device can perform uniform winding operations on concrete poles in synchronization with their rotation.

[0014] As a preferred solution of the concrete pole skeleton winding device of the utility model, wherein: sliding adjustment blocks are symmetrically fixedly installed at the two side positions of the bottom of the primary clamping bearing plate and the secondary clamping bearing plate, the fixed installation positions of the sliding adjustment blocks at the bottom of the primary clamping bearing plate and the secondary clamping bearing plate and the opening positions of the sliding adjustment slots at the upper end of the bearing frame correspond to each other, and the external specifications of the sliding adjustment blocks are adapted to the internal specifications of the sliding adjustment slots, and the primary clamping bearing plate and the secondary clamping bearing plate are both slidably connected between the sliding adjustment blocks and the sliding adjustment slots;

[0015] Through the sliding connection structure of the primary clamping bearing plate and the secondary clamping bearing plate, the device can be appropriately adjusted and clamped according to the size of the concrete pole frame to be wound, making the device suitable for winding operations of concrete pole frames of various sizes and specifications, enriching the overall functionality.

[0016] As a preferred solution of the concrete pole skeleton winding device of the utility model, wherein: the outer ring of the positioning clamping disk is symmetrically and evenly spaced with adjusting screw holes, the adjusting screw holes are movably installed with adjusting studs, the external thread specifications of the adjusting studs correspond to the internal thread specifications of the adjusting screw holes, and the adjusting studs are rotatably connected to the clamping plate through the adjusting screw holes, and the width size of the clamping plate corresponds to the width size of the positioning clamping disk;

[0017] By using the clamping plate to perform double-end alignment clamping operations on the concrete pole frame, it is effectively ensured that the device clamps the concrete pole frame more stably, and can effectively prevent the concrete pole frame from slipping and falling during normal winding work, thereby effectively reducing the overall risk of use.

[0018] As a preferred solution of the concrete pole skeleton winding device of the utility model, wherein: a rotating hole is opened at the upper end of the sliding bracket, a rotating carrier block is movably installed at the upper end of the sliding bracket, a rotating connector is fixedly installed at the bottom of the rotating carrier block, the external specifications of the rotating connector are adapted to the internal specifications of the rotating hole, and a wire through hole is opened through the side position of the rotating carrier block;

[0019] By adopting a rotating carrier block with a rotating connection, the device is made smoother and more stable when performing winding operations on the concrete skeleton.

[0020] The beneficial effects of the present invention are as follows: the present invention effectively reduces the manual labor required and greatly reduces the time required for winding operations by adding a wire feeding structure that can slide and displace synchronously with the rotation operation of the skeleton, which helps to speed up the overall work progress. Moreover, by adopting a double-end slidably adjustable clamping structure, the device as a whole can be appropriately adjusted according to the size of the pole skeleton to be processed to achieve a stable positioning clamping effect. On the basis of ensuring the stability of the overall winding operation, the overall functionality of use is enriched. At the same time, by adding a rotatable wire feeding structure, the overall stability of the steel wire during the wire conveying operation of the winding operation is guaranteed to a great extent, so that the device has a broader application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort. Among them:

[0022] Figure 1 This is a schematic diagram of the split structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the overall structure of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the clamping bearing support plate displacement adjustment state of the utility model;

[0025] Figure 4 This is a schematic diagram of the front structure of the utility model;

[0026] Figure 5 This is a side view of the load-bearing support plate of the utility model in displacement adjustment state;

[0027] Figure 6 It is a schematic diagram of the top view of the structure of the load-bearing support plate in the displacement adjustment state of the utility model.

[0028] Numbers in the figure: 1. Load-bearing frame; 2. Stable supporting foot; 3. Displacement drive motor; 4. Displacement adjustment slot; 5. Sliding adjustment slot; 6. Load-bearing pillar; 7. Primary clamping load-bearing plate; 8. Secondary clamping load-bearing plate; 9. Arc bracket; 10. Displacement adjustment screw; 11. Sliding bracket; 12. Sliding adjustment block; 13. Rotation drive motor; 14. Positioning clamping plate; 15. Load-bearing roller; 16. Supporting sliding block; 17. Adjustment screw hole; 18. Adjustment stud; 19. Clamping plate; 20. Rotation hole; 21. Rotation carrier; 22. Wire through hole; 23. Threaded connection hole; 24. Rotation connector. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation scheme disclosed below.

[0031] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, cross-sectional views of device structures may be partially enlarged and not to scale when describing the embodiments of the present invention. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0032] See also Figures 1-6The utility model provides a technical solution: a concrete pole skeleton winding device, including a bearing frame 1, a stable supporting foot 2, a displacement drive motor 3, a displacement adjustment slot 4, a sliding adjustment slot 5, a load-bearing pillar 6, a first-level clamping bearing plate 7, a second-level clamping bearing plate 8, an arc bracket 9, a displacement adjustment screw 10, a sliding bracket 11, a sliding adjustment block 12, a rotation drive motor 13, a positioning clamping plate 14, a bearing roller 15, a receiving sliding block 16, an adjusting screw hole 17, an adjusting stud 18, a clamping plate 19, a rotating hole 20, a rotating carrier block 21, a wire through hole 22, a threaded connection hole 23 and a rotating connector 24. The sliding adjustment slots 5 are symmetrically opened on both sides of the upper end of the bearing frame 1, and the middle position of the upper end of the bearing frame 1 is fixedly installed. It is equipped with a load-bearing pillar 6, a first-level clamping bearing plate 7 is movably installed at the upper end position of the sliding adjustment slot 5 on one side of the upper end of the carrying frame 1, and a second-level clamping bearing plate 8 is movably installed at the upper end position of the sliding adjustment slot 5 on the other side of the upper end of the carrying frame 1. The middle position of the inner sides of the first-level clamping bearing plate 7 and the second-level clamping bearing plate 8 are movably installed with a positioning clamping disk 14, and a rotation drive motor 13 is fixedly installed at the middle position of the outer side of the first-level clamping bearing plate 7. The output shaft of the rotation drive motor 13 passes through the first-level clamping bearing plate 7 and is fixedly connected to the positioning clamping disk 14. The corner positions of the bottom of the carrying frame 1 are symmetrically fixed with stable supporting feet 2, and the side positions of the lower end of the outer side of the carrying frame 1 are fixedly installed with displacement drive motors 3. A displacement adjustment slot 4 is laterally opened at the lower end of the side, and a displacement adjustment screw 10 is movably installed inside the displacement adjustment slot 4. The output shaft of the displacement drive motor 3 passes through the displacement adjustment slot 4 and is fixedly connected to the displacement adjustment screw 10. An arc bracket 9 is fixedly installed on the upper end of the load-bearing pillar 6, and a load-bearing roller 15 is movably installed inside the arc bracket 9 with an arc structure symmetrically and evenly spaced. The height position of the arc bracket 9 at the upper end of the load-bearing frame 1 is at the same horizontal height as the height position of the first-level clamping load-bearing plate 7 and the second-level clamping load-bearing plate 8 at the upper end of the load-bearing frame 1. A sliding bracket 11 is movably installed outside the displacement adjustment slot 4, and a receiving sliding block 16 is fixedly installed at the bottom of the sliding bracket 11. The external specifications of the receiving sliding block 16 are consistent with the displacement adjustment slot 4, the specifications in the slots thereof correspond to each other, the sliding bracket 11 is slidably connected with the displacement adjustment slot 4 by receiving the sliding block 16, and a threaded connection hole 23 is provided through the middle position of the side of the receiving sliding block 16, and the thread specifications in the threaded connection hole 23 correspond to the external thread specifications of the displacement adjustment screw 10, and the sliding adjustment blocks 12 are symmetrically fixedly installed on both sides of the bottom of the primary clamping bearing plate 7 and the secondary clamping bearing plate 8, and the fixed installation position of the sliding adjustment block 12 at the bottom of the primary clamping bearing plate 7 and the secondary clamping bearing plate 8 corresponds to each other between the opening position of the sliding adjustment slot 5 at the upper end of the carrier frame 1, and the external specifications of the sliding adjustment block 12 are adapted to the specifications in the slot of the sliding adjustment slot 5.The first-level clamping carrier plate 7 and the second-level clamping carrier plate 8 are both slidably connected between the sliding adjustment block 12 and the sliding adjustment groove 5. The outer ring of the positioning clamping disk 14 is symmetrically and evenly spaced with adjusting screw holes 17. The adjusting screw holes 17 are movably installed with adjusting studs 18. The external thread specifications of the adjusting studs 18 correspond to the internal thread specifications of the adjusting screw holes 17, and the adjusting studs 18 pass through the adjusting screw holes 17 and are rotatably connected to the clamping plate 19. The width size of the clamping plate 19 corresponds to the width size of the positioning clamping disk 14. A rotating hole 20 is provided at the upper end of the sliding bracket 11, and a rotating carrier block 21 is movably installed at the upper end of the sliding bracket 11. A rotating connector 24 is fixedly installed at the bottom of the rotating carrier block 21. The external specifications of the rotating connector 24 match the specifications in the hole of the rotating hole 20, and a through-hole 22 is provided on the side of the rotating carrier block 21.

[0033] By adding a middle support structure with an arc-shaped bracket 9 and a load-bearing roller 15, the concrete pole skeleton to be wound can obtain a more stable support effect during the alignment and clamping operation. By adding a sliding wire feeding structure of the sliding bracket 11, the device can perform uniform winding operations on the concrete pole in synchronization with its rotation. Through the sliding connection structure of the first-level clamping bearing plate 7 and the second-level clamping bearing plate 8, the device can appropriately adjust and clamp the concrete pole skeleton according to the size of the concrete pole skeleton to be wound, so that the device can be suitable for winding operations of concrete pole skeletons of various sizes and specifications, enriching the overall functionality of use. By adopting the clamping plate 19 to perform double-end alignment and clamping operations on the concrete pole skeleton, it is effectively ensured that the device clamps the concrete pole skeleton more stably, and can effectively prevent the concrete pole skeleton from slipping and falling during normal winding operations, thereby effectively reducing the overall risk of use. By adopting a rotating carrier block 21 with a rotatable connection, the device can be smoother and more stable when winding the concrete skeleton.

[0034] Working principle:

[0035] First, the concrete pole skeleton to be wound is stably placed on the arc bracket 9 fixedly connected to the load-bearing pillar 6 at the upper end of the carrier frame 1, and then, according to the specific size of the concrete pole skeleton to be processed, the first-level clamping bearing plate 7 and the second-level clamping bearing plate 8 are slidably connected between the upper end of the carrier frame 1 and the sliding adjustment groove 5 through the sliding adjustment block 12. The first-level clamping bearing plate 7 and the second-level clamping bearing plate 8 are slid to adjust the size of the concrete pole skeleton to be processed. The two ends of the concrete pole skeleton to be processed are placed inside the positioning clamping disk 14, and the rotating adjustment stud 18 utilizes the threaded adaptation structure between itself and the adjusting screw hole 17, as well as the rotating connection structure between itself and the clamping plate 19, to drive the clamping plate 19 to clamp toward the center of the positioning clamping disk 14, thereby achieving the clamping and tightening effect of the end of the concrete pole skeleton to be processed. Then, the steel wire to be wound is passed through the wire through-hole 22 and the steel wire to be processed. The concrete pole skeleton is fixed between them, and the rotation drive motor 13 and the displacement drive motor 3 are started, so that the positioning clamping plate 14 drives the clamped concrete pole skeleton to rotate stably and continuously under the drive of the rotation drive motor 13. At the same time, under the sliding connection structure between the receiving sliding block 16 and the displacement adjustment groove 4, and the adaptive threaded connection structure between the threaded connection hole 23 opened by the receiving sliding block 16 and the displacement adjustment screw 10, the displacement adjustment screw 10 is driven to rotate by the displacement drive motor 3, thereby driving the sliding bracket 11 as a whole to stably perform directional displacement sliding operation on the supporting frame 1. The rotation connection structure between the rotating carrier block 21 and the sliding bracket 11 can ensure the stable and uniform winding operation of the steel wire on the outside of the concrete pole skeleton during rotation, effectively reducing the manual intervention part without affecting the overall working performance, correspondingly accelerating the overall work progress, and helping to improve the overall processing efficiency.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A concrete pole skeleton winding device, comprising a bearing frame (1), characterized in that: Sliding adjustment grooves (5) are symmetrically provided on both sides of the upper end of the carrying frame (1); a load-bearing pillar (6) is fixedly installed at the middle position of the upper end of the carrying frame (1); a first-level clamping bearing plate (7) is movably installed at the upper end position of the sliding adjustment groove (5) on one side of the upper end of the carrying frame (1); a second-level clamping bearing plate (8) is movably installed at the upper end position of the sliding adjustment groove (5) on the other side of the upper end of the carrying frame (1); a positioning clamping disk (14) is movably installed at the middle position of the inner sides of the first-level clamping bearing plate (7) and the second-level clamping bearing plate (8); a rotating drive motor (13) is fixedly installed at the middle position of the outer side of the first-level clamping bearing plate (7); the output shaft of the rotating drive motor (13) passes through the first-level clamping bearing plate (7) and is fixedly connected to the positioning clamping disk (14).

2. The concrete pole skeleton winding device according to claim 1, characterized in that: The corner positions of the bottom of the supporting frame (1) are symmetrically fixedly installed with stable supporting feet (2); the side position of the lower end of the outer side of the supporting frame (1) is fixedly installed with a displacement driving motor (3); the lower end position of the outer side of the supporting frame (1) is laterally opened with a displacement adjustment groove (4); the interior of the displacement adjustment groove (4) is movably installed with a displacement adjustment screw (10); the output shaft of the displacement driving motor (3) passes through the displacement adjustment groove (4) and is fixedly connected to the displacement adjustment screw (10).

3. The concrete pole skeleton winding device according to claim 2, characterized in that: An arc bracket (9) is fixedly mounted on the upper end of the load-bearing pillar (6), and inside the arc bracket (9) are movably mounted load-bearing rollers (15) symmetrically and evenly spaced in an arc structure. The height position of the arc bracket (9) at the upper end of the load-bearing frame (1) is at the same level as the height positions of the primary clamping load-bearing plate (7) and the secondary clamping load-bearing plate (8) at the upper end of the load-bearing frame (1).

4. The concrete pole skeleton winding device according to claim 3, characterized in that: The displacement adjustment groove (4) is movably mounted with a sliding bracket (11), and a receiving sliding block (16) is fixedly mounted on the bottom of the sliding bracket (11). The external specifications of the receiving sliding block (16) correspond to the internal specifications of the displacement adjustment groove (4). The sliding bracket (11) is movably connected to the displacement adjustment groove (4) through the receiving sliding block (16). A threaded connection hole (23) is provided through the middle position of the side of the receiving sliding block (16). The internal thread specifications of the threaded connection hole (23) correspond to the external thread specifications of the displacement adjustment screw (10).

5. The concrete pole skeleton winding device according to claim 4, characterized in that: Sliding adjustment blocks (12) are symmetrically fixedly installed at both sides of the bottom of the primary clamping bearing plate (7) and the secondary clamping bearing plate (8), and the fixed installation positions of the sliding adjustment blocks (12) at the bottom of the primary clamping bearing plate (7) and the secondary clamping bearing plate (8) correspond to each other between the opening positions of the sliding adjustment slot (5) at the upper end of the bearing frame (1), and the external specifications of the sliding adjustment blocks (12) are adapted to the internal specifications of the sliding adjustment slot (5), and the primary clamping bearing plate (7) and the secondary clamping bearing plate (8) are both slidably connected between the sliding adjustment blocks (12) and the sliding adjustment slot (5).

6. The concrete pole skeleton winding device according to claim 5, characterized in that: The outer ring of the positioning clamping disk (14) is symmetrically provided with adjusting screw holes (17) at equal intervals, and the adjusting screw holes (17) are movably installed with adjusting studs (18). The external thread specifications of the adjusting studs (18) correspond to the internal thread specifications of the adjusting screw holes (17), and the adjusting studs (18) pass through the adjusting screw holes (17) and are rotatably connected to a clamping plate (19). The width dimension of the clamping plate (19) corresponds to the width dimension of the positioning clamping disk (14).

7. The concrete pole skeleton winding device according to claim 6, characterized in that: A rotating hole (20) is provided at the upper end of the sliding bracket (11), a rotating carrier (21) is movably mounted at the upper end of the sliding bracket (11), a rotating connector (24) is fixedly mounted at the bottom of the rotating carrier (21), the external specifications of the rotating connector (24) are adapted to the internal specifications of the rotating hole (20), and a wire through hole (22) is provided through the side of the rotating carrier (21).