Rail transit maintenance equipment

Abstract

The utility model belongs to the technical field of track maintenance equipment, and particularly relates to track traffic maintenance equipment which comprises a track main body, a movable vehicle body arranged on the track main body and a tool maintenance mechanism installed on the upper surface of the movable vehicle body. The detector corresponds to the two ends of the track main body, an auxiliary assembly is installed on the mobile vehicle body, and the auxiliary assembly comprises a bottom plate arranged below the mobile vehicle body and jacks fixedly installed between the bottom plate and the mobile vehicle body and symmetrically arranged. Therefore, when the detector performs flaw detection on the surface of the track main body, the flaw detection precision is prevented from being affected by sundries, the detection effect is improved, the use effect is better, meanwhile, the mobile vehicle body does not need to be carried by multiple persons to be separated from the track main body, convenience is provided for operation, and the labor intensity of workers is relieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of track maintenance equipment, and in particular relates to a track transportation maintenance equipment. Background Art

[0002] Rail transit refers to a type of transportation vehicle or transportation system in which operating vehicles need to travel on specific tracks. It is widely used in urban public transportation over medium and short distances. In order to ensure safe operation, it is often necessary to use rail transit maintenance equipment to inspect and repair the tracks.

[0003] After checking the public (announcement) number; CN216886700U discloses a rail transit maintenance equipment. This technology discloses "including an inspection plate and a mounting plate, the two mounting plates are respectively arranged on the front and rear surfaces of the inspection plate, and ultrasonic flaw detectors and cameras are respectively installed on the left and right sides of the lower surface of the mounting plate to inspect and photograph the track. Grooves are opened on the front and rear sides of the lower surface of the inspection plate, and a fixing rod is fixed on the upper surface of the groove. The technical scheme facilitates the movement of the device and supports the bottom of the device, ensuring the stability of the device. The maintenance personnel do not need to hold the device all the time. The ultrasonic flaw detector further detects the track surface behind the roller, which improves the detection effect. The camera is combined to photograph the track surface for later re-inspection to prevent detection loopholes, which greatly improves the practicality of the device and other technical effects".

[0004] The above design facilitates the movement of the device when in use, and supports the bottom of the device, ensuring the stability of the device, and there is no need for maintenance personnel to always hold the device. However, when the device is in use, when the maintenance is completed or in an emergency, the vehicle body needs to be detached from the track, which requires multiple people to carry it. This operation increases the use cost of the staff and the labor intensity of the staff. In addition, when the ultrasonic flaw detector is detecting flaws on the track, the debris attached to the track cannot be cleaned. When detecting flaws, the debris on the track is not cleaned, which affects the detection accuracy and reduces the use effect of the device.

[0005] In order to solve the above problems, a rail transit maintenance equipment is proposed in the present application. Utility Model Content

[0006] To solve the problems raised in the above background technology. The utility model provides a rail transit maintenance equipment, which has a detector that can avoid the impact of debris on the flaw detection accuracy when detecting flaws on the surface of the track body, improve the detection effect, and achieve better use effect. At the same time, it does not require multiple people to carry the mobile body to separate the mobile body from the track body, which provides convenience for operation, reduces the labor intensity of the staff, and improves the use effect of the device.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a rail transit maintenance equipment, comprising a rail main body, a mobile body arranged on the rail main body, and a tool maintenance mechanism installed on the upper surface of the mobile body, a symmetrically arranged detector is installed on one side of the mobile body, and the detector corresponds to two ends of the rail main body, an auxiliary component is installed on the mobile body, the auxiliary component comprises a base plate arranged under the mobile body, and jacks fixedly installed and symmetrically arranged between the base plate and the mobile body and a U-shaped rod fixed between two groups of pressing ends of the jacks, square blocks are arranged on both sides of the base plate, and a rotating rod is rotatably connected to the interior of the square block through a bearing, a cleaning brush plate is fixed on the surface of the rotating rod, a moving wheel is fixed to the bottom end of the rotating rod, and a plurality of groups of equidistantly arranged rectangular grooves are provided on the lower surface of the base plate, and a roller is arranged in the rectangular groove, and the roller is rotatably connected to the base plate through a rotating shaft.

[0008] As a preferred rail transit maintenance equipment of the utility model, one side of the interior of the base plate is threadedly connected with symmetrically arranged limiting bolts.

[0009] As a preferred rail transit maintenance equipment of the utility model, a side of the base plate surface away from the limit bolt is provided with a symmetrically arranged strip support rod, and locking holes 2 and 1 are respectively provided at both ends of the surface of the strip support rod, a strip groove is provided on the side of the base plate surface close to the strip support rod, the strip support rod is located in the strip groove, and a locking bolt 1 is threadedly connected on the side of the base plate surface close to the strip support rod, and one end of the locking bolt 1 extends into the interior of the locking hole 1.

[0010] As a preferred rail transit maintenance equipment of the utility model, a mounting seat is fixed on one side of the upper surface of the base plate close to the rotating rod, a U-shaped plate is slidably connected inside the mounting seat, an adjusting bolt is rotatably connected to one side of the mounting seat through a bearing, the adjusting bolt and the U-shaped plate are threadedly connected, and the square block is installed on the surface of the U-shaped plate.

[0011] As a preferred rail transit maintenance equipment of the utility model, a limiting hole matched with the U-shaped plate is opened on the surface of the mounting seat, and the U-shaped plate and the mounting seat are slidably connected through the limiting hole.

[0012] As a preferred rail transit maintenance equipment of the utility model, the surface of the U-shaped plate is provided with a slot adapted to the square block, the square block is located in the slot, and a locking bolt 2 is threadedly connected to one side of the U-shaped plate close to the square block, and one end of the locking bolt 2 is in conflict with the square block.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] By setting up auxiliary components and using a cleaning brush to clean up debris on the surface of the track body, the detector can avoid the impact of debris on the flaw detection accuracy when performing flaw detection on the track body surface, thereby improving the detection effect and achieving better use effect. At the same time, there is no need for multiple people to carry the mobile vehicle body to separate the mobile vehicle body from the track body, which provides convenience for operation, reduces the labor intensity of staff, and improves the use effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the structure of the connecting parts such as the jack and the U-shaped rod in the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the disassembled middle strip support rod of the utility model;

[0019] Figure 4 It is a schematic diagram of the structure of the turning rod flipping in the utility model.

[0020] In the figure: 1. Track body; 2. Moving body; 3. Tool maintenance mechanism; 4. Detector; 5. Auxiliary components; 501. Bottom plate; 502. Jack; 503. U-shaped rod; 504. Roller; 505. Limit bolt; 506. Strip support rod; 507. Locking hole one; 508. Locking hole two; 509. Locking bolt one; 510. Mounting seat; 511. U-shaped plate; 512. Adjusting bolt; 513. Locking bolt two; 514. Square block; 515. Rotating rod; 516. Cleaning brush plate; 517. Moving wheel. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Example 1

[0023] like Figure 1 As shown:

[0024] A rail transit maintenance equipment comprises a rail body 1, a mobile body 2 arranged on the rail body 1 and a tool maintenance mechanism 3 installed on the upper surface of the mobile body 2. A symmetrically arranged detector 4 is installed on one side of the mobile body 2, and the detector 4 corresponds to the two ends of the rail body 1.

[0025] In this embodiment: the existing device {publication (announcement) number}: CN216886700U discloses a rail transit maintenance equipment. The tool maintenance mechanism 3 and the detector 4 in the present application document adopt the same technical means in this prior art. This technical means is not repeated here. This application makes further improvements on this existing subject. For details, please refer to the following disclosed technology; in order to solve the technical problems existing in this prior art, as disclosed in the background technology above, "the above-mentioned design facilitates the movement of the device when in use, and at the same time supports the bottom of the device, ensuring the stability of the device, and no maintenance is required The personnel always hold the device, but when the device is in use, when the maintenance is completed or in an emergency, the car body needs to be detached from the track, so multiple people are needed to carry it. This operation increases the use cost of the staff and increases the labor intensity of the staff. Moreover, when the ultrasonic flaw detector is detecting the track, the debris attached to the track cannot be cleaned. During the flaw detection, the debris on the track is not cleaned, which affects the flaw detection accuracy and reduces the use effect of the device. "Combined with the use, this problem is obviously a real problem that exists and is difficult to solve. Therefore, in order to solve this technical problem, auxiliary component 5 is added to the application document.

[0026] It should be noted that the accessories used by the tool inspection mechanism 3 and the detector 4 have been disclosed by publication number CN216886700U, and their use effects can refer to publication number CN216886700U (that is, "ultrasonic flaw detector, camera, groove, fixed plate, fixed rod, spring, infrared rangefinder, movable frame, roller, auxiliary wheel, lamp pole, lighting lamp, mounting block, display screen, operation box, tool box, movable push rod, warning light" disclosed in this prior art).

[0027] More specifically:

[0028] like Figure 1-Figure 4 As shown:

[0029] An auxiliary component 5 is installed on the mobile body 2, and the auxiliary component 5 includes a base plate 501 arranged below the mobile body 2, and jacks 502 fixedly installed between the base plate 501 and the mobile body 2 and arranged symmetrically, and a U-shaped rod 503 fixed between the pressing ends of the two groups of jacks 502. Square blocks 514 are arranged on both sides of the base plate 501. The interior of the square block 514 is rotatably connected to a rotating rod 515 through a bearing. A cleaning brush plate 516 is fixed on the surface of the rotating rod 515. A moving wheel 517 is fixed to the bottom end of the rotating rod 515. A plurality of groups of equidistantly arranged rectangular grooves are provided on the lower surface of the base plate 501, and rollers 504 are arranged in the rectangular grooves. The rollers 504 are rotatably connected to the base plate 501 through a rotating shaft.

[0030] In this embodiment: when the rail transit inspection and maintenance equipment is in use, when the mobile car body 2 moves on the track body 1, it drives the detector 4 to move synchronously, and the track body 1 is inspected in real time by the detector 4. When the mobile car body 2 moves on the track body 1, the friction force generated by the contact between the moving wheel 517 and the surface of the track body 1 drives the rotating rod 515 to rotate, and the cleaning brush plate 516 is driven to rotate by the rotating rod 515, and the debris on the surface of the track body 1 is cleaned by the cleaning brush plate 516, so that when the detector 4 performs flaw detection on the surface of the track body 1, the flaw detection accuracy is avoided to be affected by debris, the detection effect is improved, and the use effect is better. When the mobile car body 2 is separated from the track body 1, the square block 514 and the bottom plate 501 are disassembled, and the U-shaped rod 503 is pressed back and forth, so that the jack 502 is lifted up. The reaction force generated thereby drives the bottom plate 501 to move downward until the bottom plate 501 contacts the surface of the track body 1. As the jack 502 continues to rise, the bottom plate 501 is blocked by the track body 1, and the mobile body 2 is lifted up, so that the running wheels of the mobile body 2 are separated from the surface of the track body 1, and then the mobile body 2 is pushed, thereby driving the bottom plate 501 to slide on the surface of the track body 1. Since multiple groups of rollers 504 are arranged at the bottom of the bottom plate 501, the friction between the bottom plate 501 and the track body 1 can be reduced, thereby better promoting the movement of the mobile body 2 until the mobile body 2 drives the bottom plate 501 to separate from the track body 1. Therefore, through this operation, there is no need for multiple people to carry the mobile body 2 to separate the mobile body 2 from the track body 1, which provides convenience for operation, reduces the labor intensity of the staff, and improves the use effect of the device.

[0031] It should be noted that: when the mobile body 2 is placed on the track body 1, the mobile body 2 is brought close to the track body 1, and then a group of support blocks (not shown in the figure) are placed under the bottom plate 501. The height of this support block is higher than the height of the track body 1, and then it is lifted up by the jack 502. The reaction force generated thereby drives the bottom plate 501 to move downward, and lifts the mobile body 2, and passes over the track body 1. By pushing the mobile body 2, the mobile body 2 drives the roller 504 on the bottom plate 501 to slide on the support block, and the mobile body 2 drives the bottom plate 501 to be pushed onto the track body 1, and then the bottom plate 501 is reset by the jack 502. At this time, the mobile body 2 is stuck on the track body 1, and the placement is completed, so that there is still no need for multiple people to operate, thereby improving the use effect of the device.

[0032] It should be noted that the surface of the moving wheel 517 and the cleaning surface of the cleaning brush plate 516 are both in contact with the track body 1 .

[0033] Going further;

[0034] In an optional embodiment, one inner side of the bottom plate 501 is threadedly connected with symmetrically arranged limiting bolts 505 .

[0035] In this embodiment: before the base plate 501 moves downward, it moves downward to a certain distance by rotating the limit bolt 505. When the base plate 501 contacts the track body 1, the limit bolt 505 is located on the outside of the track body 1. Due to the setting of the roller 504, the friction between the base plate 501 and the track body 1 is very small, and the stability is poor. During this process, the staff is located on the side of the base plate 501 away from the limit bolt 505 to push the mobile body 2. Therefore, the setting of the limit bolt 505 can limit the mobile body 2, prevent the mobile body 2 from sliding to the side of the staff, and improve the safety of the staff.

[0036] Going further;

[0037] In an optional embodiment, a side of the surface of the base plate 501 away from the limiting bolt 505 is provided with symmetrically arranged strip-shaped support rods 506, and locking holes 508 and 507 are respectively provided at both ends of the surface of the strip-shaped support rods 506. A strip groove is provided on the side of the surface of the base plate 501 close to the strip-shaped support rod 506, and the strip-shaped support rod 506 is located in the strip groove. A locking bolt 509 is threadedly connected to the side of the surface of the base plate 501 close to the strip-shaped support rod 506, and one end of the locking bolt 509 extends to the interior of the locking hole 507.

[0038] In this embodiment: while the base plate 501 is moved downward, the locking bolt 509 is rotated until the locking bolt 509 is disengaged from the locking hole 507, thereby releasing the lock on the strip support rod 506, and then the strip support rod 506 is moved and the locking bolt 509 is tightened so that the locking bolt 509 is inserted into the interior of the locking hole 508, thereby extending the length of one side of the base plate 501 through the provision of the strip support rod 506, and when the mobile body 2 is pushed horizontally, the roller 504 on the base plate 501 is driven to slide on the surface of the track body 1, which can effectively prevent one side of the base plate 501 from sinking into the middle part of the track body 1 due to tilting, affecting the pushing effect on the mobile body 2, and further improving the use effect of the device.

[0039] It should be noted that: when the base plate 501 is completely detached from the track body 1, the running wheels on the mobile body 2 are completely detached from the track body 1, and then the U-shaped rod 503 is pressed in the reverse direction, and the jack 502 is driven to contract, thereby driving the base plate 501 to move upward, and then driving the strip support rod 506 to move upward, so that the strip support rod 506 located on the track body 1 is detached from the track body 1, and the friction between the strip support rod 506 and the track body 1 will not affect the movement of the mobile body 2.

[0040] Going further;

[0041] In an optional embodiment, a mounting seat 510 is fixed on one side of the upper surface of the bottom plate 501 close to the rotating rod 515, a U-shaped plate 511 is slidably connected inside the mounting seat 510, an adjusting bolt 512 is rotatably connected to one side of the mounting seat 510 through a bearing, the adjusting bolt 512 is threadedly connected to the U-shaped plate 511, and a square block 514 is installed on the surface of the U-shaped plate 511;

[0042] A limiting hole matching the U-shaped plate 511 is provided on the surface of the mounting seat 510 , and the U-shaped plate 511 and the mounting seat 510 are slidably connected via the limiting hole.

[0043] In this embodiment: by rotating the adjusting bolt 512, the U-shaped plate 511 is driven to move, and through the movement of the U-shaped plate 511, the rotating rod 515 is driven to move synchronously through the square block 514, and the moving wheel 517 is driven to move synchronously through the rotating rod 515, so that the moving wheel 517 can fit more closely with the side of the track body 1, increasing the friction force, improving the rotation of the rotating rod 515, and thus making the rotation effect of the cleaning brush plate 516 better.

[0044] Going further;

[0045] In an optional embodiment, a slot matching the square block 514 is provided on the surface of the U-shaped plate 511, and the square block 514 is located in the slot. A locking bolt 2 513 is threadedly connected to one side of the U-shaped plate 511 close to the square block 514, and one end of the locking bolt 2 513 is in conflict with the square block 514.

[0046] In this embodiment: when the base plate 501 is moved downward, the locking bolt 513 is first rotated to release the squeezing of the square block 514, and then the square block 514 is pulled out from the slot opened in the U-shaped plate 511, and turned to 90°, and the square block 514 is inserted into the slot again, and then the locking bolt 513 is rotated to squeeze the square block 514. Through this operation, the downward movement of the base plate 501 is not affected, and the use of the device is further improved.

[0047] The working principle and use process of the utility model are as follows: when the rail transit inspection and maintenance equipment is in use, when the mobile vehicle body 2 moves on the rail body 1, it drives the detector 4 to move synchronously, and the rail body 1 is inspected in real time by the detector 4. When the mobile vehicle body 2 moves on the rail body 1, the friction force generated by the contact between the moving wheel 517 and the surface of the rail body 1 drives the rotating rod 515 to rotate, and the cleaning brush plate 516 is driven to rotate by the rotating rod 515, and the debris on the surface of the rail body 1 is cleaned by the cleaning brush plate 516, so that when the detector 4 performs flaw detection on the surface of the rail body 1, the flaw detection accuracy is avoided to be affected by debris, the detection effect is improved, and the use effect is better. By rotating the adjusting bolt 5 12, thereby driving the U-shaped plate 511 to move, and through the movement of the U-shaped plate 511, the rotating rod 515 is driven to move synchronously through the square block 514, and the moving wheel 517 is driven to move synchronously through the rotating rod 515, so that the moving wheel 517 can be more closely fitted with the side of the track body 1, increasing the friction force, improving the rotation of the rotating rod 515, and thus making the rotation effect of the cleaning brush plate 516 better. When the mobile vehicle body 2 is separated from the track body 1, the U-shaped rod 503 is pressed back and forth, so that the jack 502 is lifted up, and the reaction force generated thereby drives the bottom plate 501 to move downward until the bottom plate 501 contacts the surface of the track body 1. As the jack 502 continues to rise, the bottom plate 501 The moving vehicle body 2 is blocked by the track body 1, and then the moving vehicle body 2 is lifted up, so that the running wheels of the moving vehicle body 2 are separated from the surface of the track body 1, and then the moving vehicle body 2 is pushed, thereby driving the bottom plate 501 to slide on the surface of the track body 1. Since multiple groups of rollers 504 are arranged at the bottom of the bottom plate 501, the friction between the bottom plate 501 and the track body 1 can be reduced, thereby better promoting the movement of the moving vehicle body 2, until the moving vehicle body 2 drives the bottom plate 501 to separate from the track body 1. Through this operation, there is no need for multiple people to carry the moving vehicle body 2 to separate the moving vehicle body 2 from the track body 1, which provides convenience for operation, reduces the labor intensity of the staff, and improves the use effect of the device. When the bottom plate 501 is moved down, first First, turn the locking bolt 513 to release the squeezing of the square block 514, then pull the square block 514 out of the slot provided in the U-shaped plate 511, turn it to 90°, and insert the square block 514 into the slot again, then turn the locking bolt 513 to squeeze the square block 514. This operation will not affect the downward movement of the bottom plate 501, and further improve the use of the device. Before the bottom plate 501 moves downward, it is moved downward to a certain distance by turning the limit bolt 505. When the bottom plate 501 contacts the track body 1, the limit bolt 505 is located on the outside of the track body 1. Due to the setting of the roller 504, the friction between the bottom plate 501 and the track body 1 is very small, and the stability is poor. In this process,The staff is located on the side of the bottom plate 501 away from the limiting bolt 505 to push the mobile body 2. Therefore, the setting of the limiting bolt 505 can limit the mobile body 2, prevent the mobile body 2 from sliding toward the side of the staff, and improve the safety of the staff. While the bottom plate 501 is moved downward, the locking bolt 1 509 is rotated until the locking bolt 1 509 is disengaged from the locking hole 1 507, and the lock of the strip support rod 506 is released. Then the strip support rod 506 is moved and the locking bolt 1 509 is tightened, so that the locking bolt 1 509 is inserted into the inside of the locking hole 2 508. Therefore, the length of one side of the bottom plate 501 is extended by the setting of the strip support rod 506. When the mobile body 2 is pushed horizontally, the roller 504 on the bottom plate 501 is driven to slide on the surface of the track body 1, which can effectively prevent one side of the bottom plate 501 from sinking into the middle part of the track body 1 due to tilting, affecting the pushing effect of the mobile body 2, and further improving the use effect of the device.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A rail transit maintenance equipment, comprising a rail body (1), a mobile vehicle body (2) arranged on the rail body (1), and a tool maintenance mechanism (3) installed on the upper surface of the mobile vehicle body (2), wherein a detector (4) arranged symmetrically is installed on one side of the mobile vehicle body (2), and the detector (4) corresponds to the two ends of the rail body (1), characterized in that: An auxiliary component (5) is installed on the mobile body (2), and the auxiliary component (5) comprises a bottom plate (501) arranged below the mobile body (2), and jacks (502) fixedly installed between the bottom plate (501) and the mobile body (2) and arranged symmetrically, and a U-shaped rod (503) fixed between two groups of pressing ends of the jacks (502); square blocks (514) are arranged on both sides of the bottom plate (501); a rotating rod (515) is rotatably connected to the inside of the square block (514) via a bearing; a cleaning brush plate (516) is fixed to the surface of the rotating rod (515); a moving wheel (517) is fixed to the bottom end of the rotating rod (515); a plurality of groups of rectangular grooves arranged at equal intervals are provided on the lower surface of the bottom plate (501), and rollers (504) are arranged in the rectangular grooves; the rollers (504) are rotatably connected to the bottom plate (501) via a rotating shaft.

2. A rail transit maintenance equipment according to claim 1, characterized in that: One side of the interior of the bottom plate (501) is threadedly connected with symmetrically arranged limiting bolts (505).

3. A rail transit maintenance equipment according to claim 2, characterized in that: A symmetrically arranged strip-shaped support rod (506) is provided on the side of the surface of the base plate (501) away from the limiting bolt (505), and a locking hole 2 (508) and a locking hole 1 (507) are respectively provided at two ends of the surface of the strip-shaped support rod (506). A strip-shaped groove is provided on the side of the surface of the base plate (501) close to the strip-shaped support rod (506), and the strip-shaped support rod (506) is located in the strip-shaped groove. A locking bolt 1 (509) is threadedly connected to the side of the surface of the base plate (501) close to the strip-shaped support rod (506), and one end of the locking bolt 1 (509) extends to the interior of the locking hole 1 (507).

4. A rail transit maintenance equipment according to claim 3, characterized in that: A mounting seat (510) is fixed on one side of the upper surface of the base plate (501) close to the rotating rod (515); a U-shaped plate (511) is slidably connected inside the mounting seat (510); an adjusting bolt (512) is rotatably connected to one side of the mounting seat (510) via a bearing; the adjusting bolt (512) and the U-shaped plate (511) are threadedly connected; and the square block (514) is mounted on the surface of the U-shaped plate (511).

5. A rail transit maintenance equipment according to claim 4, characterized in that: A limiting hole matching the U-shaped plate (511) is provided on the surface of the mounting seat (510), and the U-shaped plate (511) and the mounting seat (510) are slidably connected via the limiting hole.

6. A rail transit maintenance equipment according to claim 5, characterized in that: The surface of the U-shaped plate (511) is provided with a slot adapted to the square block (514), the square block (514) is located in the slot, and a second locking bolt (513) is threadedly connected to one side of the U-shaped plate (511) close to the square block (514), and one end of the second locking bolt (513) is in conflict with the square block (514).

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