Ditching equipment for cable laying

By designing the wall fixing mechanism and bulldozing mechanism in the trench opening equipment for cable laying, the problems of trench collapse and soil fallback caused by soft geology are solved, and a more stable trench opening and cable laying process is achieved.

CN222923830UActive Publication Date: 2025-05-30HONY CONSTR GRP CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202422020812.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-20
Publication Date
2025-05-30
Estimated Expiration
2034-08-20

AI Technical Summary

Technical Problem

During the trenching process, existing trenching equipment for cable laying can easily lead to trench collapse and soil fall back, affecting cable laying.

Method used

A trenching equipment for cable laying is designed, including a wall fixing mechanism and a bulldozing mechanism. The wall-fixing mechanism strengthens the trench wall through the first threaded rod and the guide rod to prevent collapse; the bulldozing mechanism pushes the excavated soil out of the trench through the second threaded rod and the bulldozing plate.

Benefits of technology

Effectively prevent trench collapse and soil fall back, improving the stability of trench opening and the efficiency of cable laying.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222923830U_ABST
    Figure CN222923830U_ABST
Patent Text Reader

Abstract

The utility model relates to the technical field of cable laying, in particular to ditching equipment for cable laying, which comprises a fixed plate, a turnover mechanism is arranged in front of the fixed plate, support plates are fixedly connected to two ends of the front end of the fixed plate, turnover plates are hinged to the front of the two support plates, and the turnover plates are hinged to the front of the fixed plate. The sides, close to each other, of the two overturning plates are fixedly connected with adapter plates, a ditching mechanism is arranged between the two adapter plates, and the wall fixing mechanism is used for reinforcing the ditch wall, and the bulldozing mechanism is used for pushing soil on the two sides of a gully away. By arranging the wall fixing mechanism, the side wall of the groove can be reinforced in the groove, the groove is prevented from collapsing, by arranging the bulldozing mechanism, soil on the two sides of a gully can be pushed away in the ditching process, dug soil is prevented from entering the groove, and by arranging the ditching mechanism, the requirement for grooves with different widths can be met in the ditching process.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the technical field of cable laying, in particular to a trench digging device for cable laying. Background Technique

[0002] After retrieving the patent document with the publication number of CN220953595U, this patent document drives the movement of the moving block that is in threaded cooperation with the lead screw by setting an adjusting mechanism, drives the connecting rod and the triangular rod connected to the moving block to move, thereby driving the rotating sprocket at the top of the moving block, the driven sprocket at the front end of the connecting rod, and the driving sprocket connected to the triangular rod to move, so that the chain moves;

[0003] During the trench digging process of this patent document, when encountering soft geology, when the driving sprocket drives the chain to dig the trench, the excavated soil will fall back into the trench, affecting cable laying. It is necessary to continuously dig out the fallen soil. Due to the soft geology, the side walls of the trench are difficult to support, resulting in the collapse of the trench, and it is necessary to reinforce the side walls of the trench, increasing the difficulty of trench digging. Content of the Utility Model

[0004] The purpose of the utility model is to provide a trench digging device for cable laying in order to solve the above problems.

[0005] The utility model realizes the above purpose through the following technical solutions:

[0006] A trench digging device for cable laying includes a fixing plate. A flipping mechanism is arranged in front of the fixing plate. Both ends of the front end of the fixing plate are fixedly connected with support plates. Flipping plates are hinged in front of both support plates. Connecting plates are fixedly connected to one side of both flipping plates close to each other. A trench digging mechanism is arranged between both connecting plates. A wall fixing mechanism for reinforcing the trench wall and a soil pushing mechanism for pushing the soil on both sides of the gully away are also included;

[0007] The wall fixing mechanism includes a first threaded rod and a guide rod. Both the first threaded rod and the guide rod are rotatably connected between both connecting plates. A wall fixing motor is fixedly arranged at the input end of the first threaded rod. One end of the first threaded rod extending out of the connecting plate is fixedly connected with a driving pulley. Two connecting plates are arranged on the first threaded rod and the guide rod. Both connecting plates are in threaded connection with the first threaded rod. Both connecting plates are slidably connected with the guide rod. Fixing plates are rotatably connected to the front ends of both connecting plates;

[0008] The soil pushing mechanism includes a second threaded rod. The second threaded rod is rotatably connected between both connecting plates. Two soil pushing plates are in threaded connection with the second threaded rod. One end of the second threaded rod extending out of the connecting plate is fixedly connected with a driven pulley. The driven pulley is synchronously rotationally connected with the driving pulley through a belt.

[0009] Preferably, the flipping mechanism includes a fixed seat located at the center of the fixed plate. A round rod for rotation within the fixed plate is provided at the rear end of the fixed seat. The front end of the fixed seat is fixedly connected to a hydraulic cylinder. The telescopic part of the hydraulic cylinder is fixedly connected to a first rotating shaft, and the first rotating shaft is rotatably connected to the rear end of the connecting block. The front end of the connecting block is fixedly connected to a fixed shaft, and both ends of the fixed shaft are fixedly connected to two flipping plates and two adapter plates.

[0010] Preferably, the ditching mechanism includes a third threaded rod and a driving shaft. Both the third threaded rod and the driving shaft are rotatably connected inside two adapter plates. The third threaded rod is located in front of the driving shaft. A sliding key for sliding is provided on the outer part of the driving shaft. Two connecting rods are jointly arranged on the third threaded rod and the driving shaft. Both connecting rods are threadedly connected to the third threaded rod and are slidably connected to the driving shaft. Driving sprockets are provided at the rear ends of both connecting rods. Chutes for cooperating with the sliding key on the outer part of the driving shaft are provided on the inner walls of both driving sprockets. Rotating sprockets are provided in the middle of both connecting rods. Rolling bearings for rotation on the third threaded rod are provided on the inner walls of both rotating sprockets. The front ends of both connecting rods are rotatably connected to driven sprockets. The two driven sprockets and the two rotating sprockets are synchronously rotatably connected through two chains to the two driving sprockets.

[0011] Preferably, the second threaded rod penetrates through the interiors of both connecting rods. Two opposite threads are provided on the second threaded rod. Two earth-pushing plates are symmetrically arranged on the second threaded rod, and the two earth-pushing plates are respectively located on the sides of both connecting rods away from each other.

[0012] Preferably, the two connecting rods are symmetrically arranged on the third threaded rod and the driving shaft. Two opposite threads are provided on the third threaded rod. First grooves for the rotation of the two driving sprockets are provided at the rear ends of both connecting rods. Second grooves for the rotation of the two driven sprockets are provided at the front ends of both connecting rods. First through grooves for the rotation of the two rotating sprockets are provided in the middle of both connecting rods. Uniform blades for ditching are provided on the two chains. Threads for threaded cooperation with the third threaded rod are provided on the inner walls of both rolling bearings.

[0013] Preferably, two opposite threads are provided on the first threaded rod. Two connecting plates are symmetrically arranged on the first threaded rod and the guide rod. The widths of the two solid wall plates are equal to the widths of the two connecting rods.

[0014] Preferably, a second through groove for the rotation of the fixed seat is provided on the fixed plate.

[0015] The beneficial effects compared with the prior art are as follows:

[0016] 1. By providing the solid wall mechanism, the side walls of the trench can be reinforced within the trench to prevent the trench from collapsing. By providing the earth-pushing mechanism, during the ditching process, the soil on both sides of the gully can be pushed away to prevent the excavated soil from entering the trench.

[0017] 2. By setting up a ditching mechanism, ditches with different widths can be satisfied during the ditching process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of a ditching device for cable laying according to the present invention;

[0020] Figure 2 It is a front view of a ditching device for cable laying according to the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the flipping mechanism of a ditching device for cable laying according to the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the wall - fixing mechanism of a ditching device for cable laying according to the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the earth - pushing mechanism of a ditching device for cable laying according to the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of the ditching mechanism of a ditching device for cable laying according to the present invention;

[0025] Figure 7 It is a front view of partial parts of the ditching mechanism of a ditching device for cable laying according to the present invention.

[0026] The description of the reference numerals is as follows:

[0027] 1. Fixed plate; 2. Support plate; 3. Flipping plate; 4. Adapter plate; 5. Flipping mechanism; 501. Fixed seat; 502. Hydraulic cylinder; 503. First rotating shaft; 504. Connecting block; 505. Fixed shaft; 6. Wall-fixing mechanism; 601. First threaded rod; 602. Guide rod; 603. Connecting plate; 604. Wall-fixing plate; 605. Driving pulley; 606. Wall-fixing motor; 7. Earth-pushing mechanism; 701. Earth-pushing plate; 702. Second threaded rod; 703. Driven pulley; 704. Belt; 8. Ditch-digging mechanism; 801. Connecting rod; 802. Third threaded rod; 803. Driving shaft; 804. Driving sprocket; 805. Rotating sprocket; 806. Driven sprocket; 807. Chain. Detailed implementation manners

[0028] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0029] The present invention will be further described below with reference to the accompanying drawings:

[0030] As Figures 1-7 shown, a ditch-digging device for cable laying includes a fixed plate 1. A flipping mechanism 5 is provided in front of the fixed plate 1. Both ends of the front end of the fixed plate 1 are fixedly connected with support plates 2. Flipping plates 3 are hinged in front of the two support plates 2. Adapter plates 4 are fixedly connected to the sides of the two flipping plates 3 close to each other. A ditch-digging mechanism 8 is provided between the two adapter plates 4. It also includes a wall-fixing mechanism 6 for strengthening the ditch walls and an earth-pushing mechanism 7 for pushing the soil on both sides of the gully away.

[0031] In this embodiment: The ditching mechanism 8 includes a third threaded rod 802 and a drive shaft 803. Both the third threaded rod 802 and the drive shaft 803 are rotatably connected inside the two adapter plates 4. The third threaded rod 802 is located in front of the drive shaft 803. A sliding key for sliding is provided on the outside of the drive shaft 803. Two connecting rods 801 are jointly provided on the third threaded rod 802 and the drive shaft 803. Both of the two connecting rods 801 are threadedly connected to the third threaded rod 802 and are slidably connected to the drive shaft 803. Drive sprockets 804 are provided at the rear ends of both of the two connecting rods 801. Chutes for cooperating with the sliding key on the outside of the drive shaft 803 are provided on the inner walls of both of the two drive sprockets 804. Rotating sprockets 805 are provided in the middle of both of the two connecting rods 801. Rolling bearings for rotating on the third threaded rod 802 are provided on the inner walls of both of the two rotating sprockets 805. Driven sprockets 806 are rotatably connected to the front ends of both of the two connecting rods 801. The two driven sprockets 806 and the two rotating sprockets 805 are synchronously rotatably connected through two chains 807. The two connecting rods 801 are symmetrically arranged on the third threaded rod 802 and the drive shaft 803. Two opposite threads are provided on the third threaded rod 802. First grooves for the rotation of the two drive sprockets 804 are provided at the rear ends of both of the two connecting rods 801. Second grooves for the rotation of the two driven sprockets 806 are provided at the front ends of both of the two connecting rods 801. First through grooves for the rotation of the two rotating sprockets 805 are provided in the middle of both of the two connecting rods 801. Uniform blades for ditching are provided on the two chains 807. Threads for threadedly cooperating with the third threaded rod 802 are provided on the inner walls of both of the two rolling bearings. When the drive shaft 803 rotates, it drives the two drive sprockets 804 that are keyway-fitted with the drive shaft 803 to rotate, and drives the two rotating sprockets 805 and the two driven sprockets 806 to rotate through the two chains 807. When the ditching width needs to be adjusted, the third threaded rod 802 is rotated. Since the rolling bearings on the inner walls of the two rotating sprockets 805 are threadedly connected to the third threaded rod 802, the two rotating sprockets 805 move away from each other, causing the two connecting rods 801 that are threadedly connected to the third threaded rod 802 to move away from each other. The two connecting rods 801 slide on the drive shaft 803, driving the two drive sprockets 804 at the rear ends of the two connecting rods 801 and the two driven sprockets 806 at the front ends of the two connecting rods 801 to move, thereby causing the two chains 807 to move. Since two opposite thread directions are provided on the third threaded rod 802, the two connecting rods 801 move away from and close to each other.

[0032] In this embodiment: The wall-fixing mechanism 6 includes a first threaded rod 601 and a guide rod 602. Both the first threaded rod 601 and the guide rod 602 are rotatably connected between two adapter plates 4. A wall-fixing motor 606 is fixedly arranged at the input end of the first threaded rod 601. One end of the first threaded rod 601 extending out of the adapter plate 4 is fixedly connected with a driving pulley 605. There are two connecting plates 603 on the first threaded rod 601 and the guide rod 602. Both of the two connecting plates 603 are threadedly connected with the first threaded rod 601 and are slidably connected with the guide rod 602. The front ends of both of the two connecting plates 603 are rotatably connected with wall-fixing plates 604. The first threaded rod 601 is provided with two opposite threads. The two connecting plates 603 are symmetrically arranged on the first threaded rod 601 and the guide rod 602. The widths of the two wall-fixing plates 604 are equal to the widths of the two connecting rods 801. During operation, the wall-fixing motor 606 drives the first threaded rod 601 to rotate, causing the two connecting plates 603 threadedly connected with the first threaded rod 601 to move on the guide rod 602, driving the two wall-fixing plates 604 at the front ends of the two connecting plates 603 to move. Due to the two opposite thread directions on the first threaded rod 601, the two connecting plates 603 move away from and close to each other, causing the two wall-fixing plates 604 to move away from and close to each other, and squeezing and strengthening the side walls of the groove.

[0033] In this embodiment: The earth-pushing mechanism 7 includes a second threaded rod 702. The second threaded rod 702 is rotatably connected between two adapter plates 4. Two earth-pushing plates 701 are threadedly connected with the second threaded rod 702. One end of the second threaded rod 702 extending out of the adapter plate 4 is fixedly connected with a driven pulley 703. The driven pulley 703 is synchronously rotationally connected with the driving pulley 605 through a belt 704. The second threaded rod 702 penetrates through the interiors of the two connecting rods 801. The second threaded rod 702 is provided with two opposite threads. The two earth-pushing plates 701 are symmetrically arranged on the second threaded rod 702. The two earth-pushing plates 701 are respectively located on one side where the two connecting rods 801 are away from each other. Since the first threaded rod 601 rotates, the driving pulley 605 fixedly connected to one end of the first threaded rod 601 rotates. When the driving pulley 605 rotates, it drives the driven pulley 703 to rotate synchronously through the belt 704, causing the second threaded rod 702 to rotate, thereby driving the two earth-pushing plates 701 threadedly connected with the second threaded rod 702 to move. Due to the two opposite thread directions on the second threaded rod 702, the two earth-pushing plates 701 move away from and close to each other, pushing the excavated soil to both sides.

[0034] In this embodiment: The flipping mechanism 5 includes a fixed seat 501. The fixed seat 501 is located at the central position of the fixed plate 1. A round rod for rotating within the fixed plate 1 is provided at the rear end of the fixed seat 501. A hydraulic cylinder 502 is fixedly connected to the front end of the fixed seat 501. The telescopic part of the hydraulic cylinder 502 is fixedly connected to a first rotating shaft 503. The first rotating shaft 503 is rotatably connected to the rear end of a connecting block 504. A fixed shaft 505 is fixedly connected to the front end of the connecting block 504. Both ends of the fixed shaft 505 are fixedly connected to two flipping plates 3 and two adapter plates 4. A second through groove for the rotation of the fixed seat 501 is provided on the fixed plate 1. The hydraulic cylinder 502 fixed on the fixed seat 501 pushes the first rotating shaft 503 fixedly connected to the telescopic part of the hydraulic cylinder 502 to rotate at the rear end of the connecting block 504, causing the fixed shaft 505 fixedly connected to the connecting block 504 to move, thereby driving the two flipping plates 3, which are both hinged to the two support plates 2, to flip around the two support plates 2, and causing the two adapter plates 4 to flip synchronously.

[0035] Working principle: Fix the fixed plate 1 to the mobile end. The mobile end takes the entire device to the trenching position. The drive shaft 803 rotates, driving the two drive sprockets 804 that are keyway - fitted with the drive shaft 803 to rotate, so that the two rotating sprockets 805 and the two driven sprockets 806 connected by the two chains 807 rotate synchronously. The hydraulic cylinder 502 is used to push the first rotating shaft 503 to rotate within the connecting block 504, so that the connecting block 504 drives the fixed shaft 505 to move. Since the two turning plates 3 fixedly connected to the fixed shaft 505 are both hinged to the two support plates 2, the two turning plates 3 are turned around the two support plates 2, thereby driving the two adapter plates 4 to turn synchronously. Since the third threaded rod 802 and the drive shaft 803, as well as the first threaded rod 601 and the guide rod 602, are all rotatably connected between the two adapter plates 4, the two chains 807 and the two connecting plates 603 move downward. The evenly - distributed blades on the two chains 807 touch the ground and start trenching. The wall - fixing motor 606 drives the first threaded rod 601 to rotate, so that the two connecting plates 603 thread - connected to the first threaded rod 601 move away from each other on the guide rod 602. The movement of the two connecting plates 603 drives the two wall - fixing plates 604 to move away from each other, so that the two wall - fixing plates 604 squeeze the trench for reinforcement. At the same time, the driving pulley 605 at the end of the first threaded rod 601 rotates, driving the driven pulley 703 connected by the belt 704 to rotate synchronously, so that the second threaded rod 702 rotates. The rotation of the second threaded rod 702 drives the two earth - pushing plates 701 thread - connected to the second threaded rod 702 to move. Since the second threaded rod 702 has two opposite thread directions, the two earth - pushing plates 701 move away from each other, pushing the excavated soil away. When it is necessary to adjust the trenching width, rotate the third threaded rod 802. Since the rolling bearings inside the two rotating sprockets 805 are thread - connected to the third threaded rod 802, the two rotating sprockets 805 move. At the same time, the two connecting rods 801 thread - connected to the third threaded rod 802 move. The two connecting rods 801 move on the drive shaft 803, driving the two drive sprockets 804 at the rear ends of the two connecting rods 801 and the two driven sprockets 806 at the front ends of the two connecting rods 801 to move, thereby driving the two chains 807 to move and adjusting them to the required width.

[0036] The above shows and describes the basic principle, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above - mentioned embodiments. What is described in the above - mentioned embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed.

Claims

1. A trenching device for cable laying, comprising a fixed plate (1), a flip mechanism (5) is provided in front of the fixed plate (1), both ends of the front end of the fixed plate (1) are fixedly connected to support plates (2), the front of the two support plates (2) are hinged with flip plates (3), the sides of the two flip plates (3) close to each other are fixedly connected to adapter plates (4), and a trenching mechanism (8) is provided between the two adapter plates (4), characterized in that: It also includes a wall-fixing mechanism (6) for reinforcing the ditch wall and a pusher mechanism (7) for pushing away soil on both sides of the ditch; The wall fixing mechanism (6) comprises a first threaded rod (601) and a guide rod (602), the first threaded rod (601) and the guide rod (602) are both rotatably connected between the two adapter plates (4), a wall fixing motor (606) is fixedly arranged at the input end of the first threaded rod (601), one end of the first threaded rod (601) extending out of the adapter plate (4) is fixedly connected to a driving pulley (605), two connecting plates (603) are arranged on the first threaded rod (601) and the guide rod (602), the two connecting plates (603) are both threadedly connected to the first threaded rod (601), the two connecting plates (603) are both slidably connected to the guide rod (602), and the front ends of the two connecting plates (603) are both rotatably connected to a wall fixing plate (604); The bulldozer mechanism (7) comprises a second threaded rod (702), the second threaded rod (702) being rotatably connected between the two adapter plates (4), two bulldozer plates (701) being threadedly connected to the second threaded rod (702), one end of the second threaded rod (702) extending out of the adapter plate (4) being fixedly connected to a driven pulley (703), and the driven pulley (703) being rotatably connected synchronously with the driving pulley (605) via a belt (704).

2. A trenching device for cable laying according to claim 1, characterized in that: The flip mechanism (5) comprises a fixed seat (501), the fixed seat (501) is located at the center of the fixed plate (1), a round rod for rotating in the fixed plate (1) is provided at the rear end of the fixed seat (501), a hydraulic cylinder (502) is fixedly connected to the front end of the fixed seat (501), a telescopic part of the hydraulic cylinder (502) is fixedly connected to a first rotating shaft (503), the first rotating shaft (503) is rotatably connected to the rear end of a connecting block (504), a fixed shaft (505) is fixedly connected to the front end of the connecting block (504), and two ends of the fixed shaft (505) are fixedly connected to the two flip plates (3) and the two adapter plates (4).

3. A trenching device for cable laying according to claim 1, characterized in that: The ditching mechanism (8) includes a third threaded rod (802) and a drive shaft (803), wherein the third threaded rod (802) and the drive shaft (803) are both rotatably connected to the inside of the two adapter plates (4), the third threaded rod (802) is located in front of the drive shaft (803), and a sliding key is provided on the outside of the drive shaft (803) for sliding, and two connecting rods (801) are provided on the third threaded rod (802) and the drive shaft (803), and the two connecting rods (801) are both threadedly connected to the third threaded rod (802), and the two connecting rods (801) are both slidably connected to the drive shaft (803). The rear ends of the connecting rods (801) are each provided with a driving sprocket (804), the inner walls of the two driving sprockets (804) are each provided with a sliding groove for cooperating with a sliding key on the outside of the driving shaft (803), the middle parts of the two connecting rods (801) are each provided with a rotating sprocket (805), the inner walls of the two rotating sprockets (805) are each provided with a rolling bearing for rotating on the third threaded rod (802), the front ends of the two connecting rods (801) are each rotatably connected with a driven sprocket (806), the two driven sprockets (806) and the two rotating sprockets (805) are synchronously rotatably connected with the two driving sprockets (804) via two chains (807).

4. A trenching device for cable laying according to claim 3, characterized in that: The second threaded rod (702) passes through the interior of the two connecting rods (801), and the second threaded rod (702) is provided with two opposite threads. The two bulldozer plates (701) are symmetrically arranged on the second threaded rod (702), and the two bulldozer plates (701) are respectively located on the sides of the two connecting rods (801) that are away from each other.

5. A trenching device for cable laying according to claim 3, characterized in that: The two connecting rods (801) are symmetrically arranged on the third threaded rod (802) and the driving shaft (803), and two opposite threads are provided on the third threaded rod (802). The rear ends of the two connecting rods (801) are provided with a first groove for the rotation of the two driving sprockets (804), and the front ends of the two connecting rods (801) are provided with a second groove for the rotation of the two driven sprockets (806). The middle parts of the two connecting rods (801) are provided with a first through groove for the rotation of the two rotating sprockets (805). The two chains (807) are provided with uniform blades for grooving, and the inner walls of the two rolling bearings are provided with threads for matching with the threads of the third threaded rod (802).

6. A trenching device for cable laying according to claim 3, characterized in that: The first threaded rod (601) is provided with two opposite threads, the two connecting plates (603) are symmetrically arranged on the first threaded rod (601) and the guide rod (602), and the width of the two fixing plates (604) is equal to the width of the two connecting rods (801).

7. A trenching device for cable laying according to claim 2, characterized in that: The fixing plate (1) is provided with a second through slot for the fixing seat (501) to rotate.