Traffic sign post

Abstract

The utility model provides a traffic sign post. The traffic sign post comprises a supporting column, an extending column, a lifting assembly, a mounting base and a moving assembly. The lifting assembly is adjusted to drive the extending column to slide in the height direction of the supporting column, the extending column slides in the height direction of the supporting column, the two sets of mounting rods drive the mounting base to slide in the height direction of the supporting column, and the mounting base slides in the height direction of the supporting column to drive the signboard to slide in the height direction of the supporting column. The mounting seat is driven to slide in the radial direction of the supporting column by adjusting the moving assembly, and the mounting seat slides in the radial direction of the supporting column to drive the signboard to slide in the radial direction of the supporting column, so that the horizontal mounting position of the signboard is adjusted, and the mounting height and the horizontal mounting position of the signboard are adjusted; supporting columns with different lengths do not need to be replaced, the signboard does not need to be disassembled, the installation height and the horizontal position of the signboard are convenient and labor-saving to adjust, and the practicability of the device is improved.

Description

Technical Field

[0001] The utility model specifically relates to a traffic sign pole. Background Art

[0002] Traffic sign poles are also called road sign poles and highway sign poles. They are pillars on both sides of the highway used to indicate traffic routes. In road traffic planning and construction, it is very important to reasonably set up and maintain traffic sign poles. They play an important role in traffic safety and smoothness.

[0003] For example, a Chinese patent with patent number 202222729062.9 discloses a traffic sign pole that facilitates the installation of signboards, including a pole body, two connecting seats are provided on the pole body, a cantilever is connected to one side of each connecting seat, a plurality of auxiliary rods are provided between the two connecting seats, a mounting plate is provided between the plurality of auxiliary rods, the mounting plate is fixed on one side of the auxiliary rod, and a clamping assembly is provided on the mounting plate.

[0004] The rod bodies in existing traffic sign poles are mostly integral structures. When the installation height of the sign needs to be adjusted, the rod bodies of different lengths need to be replaced. When the horizontal installation position of the sign needs to be adjusted, the sign needs to be removed from the rod body, moved horizontally, and then installed on the rod body again. It is troublesome and laborious to adjust the installation height and horizontal position of the sign, which reduces the practicality of the device. Therefore, in view of the above technical problems, a traffic sign pole is proposed. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a traffic sign pole, which is convenient and labor-saving to adjust the installation height and horizontal position of the sign board, thereby improving the practicability of the device.

[0006] A traffic sign pole, comprising:

[0007] A support column, the bottom end of which can be fixed to the bottom surface by bolts;

[0008] An extension column, which can be slidably arranged on the support column along the height direction of the support column;

[0009] A lifting assembly is arranged on the support column and connected to the extension column, and adjusting the lifting assembly can drive the extension column to slide;

[0010] A mounting seat, wherein two groups of mounting rods are arranged at the top of the extension column, and the mounting seat can be radially slidably arranged on the two groups of mounting rods along the support column, and a signboard is arranged on the mounting seat; and

[0011] The moving assembly is arranged on the extension column and connected with the mounting seat. The moving assembly can be adjusted to drive the mounting seat to slide.

[0012] The beneficial effects of the above-mentioned traffic sign pole are:

[0013] By adjusting the lifting assembly, the extension column is driven to slide along the height direction of the support column. The extension column slides along the height direction of the support column and drives the mounting seat to slide along the height direction of the support column through two sets of mounting rods. The mounting seat slides along the height direction of the support column to drive the signboard to slide along the height direction of the support column, thereby adjusting the installation height of the signboard. By adjusting the moving assembly, the mounting seat is driven to slide radially along the support column. The mounting seat slides radially along the support column to drive the signboard to slide radially along the support column, thereby adjusting the horizontal installation position of the signboard. When adjusting the installation height and horizontal installation position of the signboard, there is no need to replace support columns of different lengths and disassemble the signboard. Adjusting the installation height and horizontal position of the signboard is convenient and labor-saving, thereby improving the practicability of the device.

[0014] In one embodiment, a first guide hole is provided at the top of the support column, and the bottom end of the extension column can be slidably inserted into the first guide hole along the height direction of the support column, and multiple groups of first slide grooves are provided around the first guide hole, and multiple groups of first sliders are provided around the extension column, and multiple groups of first sliders are slidably set in multiple groups of first slide grooves. The stability of the extension column sliding can be improved by providing the first guide hole to cooperate with the extension column, and the extension column is inserted into the support column to reduce the volume of the extension column and the support column, and the phenomenon of relative rotation between the extension column and the support column when sliding can be avoided by providing multiple groups of first slide grooves and multiple groups of first sliders.

[0015] In one embodiment, the lifting assembly includes a first screw, a rotating shaft and a first bevel gear; the first screw is rotatably arranged in the first guide hole, and is arranged parallel to the support column and is threadedly connected to the extension column; the rotating shaft is rotatably arranged on the support column, and a mounting cavity is provided in the support column; one end of the first screw and the rotating shaft extends into the mounting cavity, and the first bevel gears are respectively arranged, and two groups of the first bevel gears are meshed. By rotating the rotating shaft, the rotation of the rotating shaft can drive the first screw to rotate through the cooperation of the two groups of first bevel gears, and the rotation of the first screw and the extension column thread can drive the extension column to slide, which is convenient for driving the extension column to slide, and stopping the rotation of the rotating shaft stops the first screw from rotating, and the first screw stops rotating and cooperates with the extension column thread to fix the extension column, which is convenient for fixing the extension column.

[0016] In one embodiment, the mounting seat is provided with two groups of through slots, and the two groups of through slots can be radially slidable along the support column and sleeved on the two groups of mounting rods. The bottom end of the mounting seat is threadedly connected to a limiting bolt, and the bottom end of one group of mounting rods is provided with a limiting slide groove, and one end of the limiting bolt can be radially slidable along the support column and is arranged in the limiting slide groove. When the mounting seat slides, the mounting seat drives the limiting bolt to slide, and at this time, the limiting bolt cooperates with the limiting slide groove to prevent the mounting seat from slipping off the two groups of mounting rods.

[0017] In one embodiment, the moving assembly includes a second screw rod; the second screw rod is rotatably disposed on the extension column and is disposed parallel to the mounting rod, and the second screw rod is threadedly connected to the mounting seat. The mounting seat can be driven to slide by rotating the second screw rod and engaging with the mounting seat thread, and driving the mounting seat to slide is convenient. The mounting seat can be fixed by stopping the rotation of the second screw rod and engaging with the mounting seat thread, and fixing the mounting seat is convenient.

[0018] In one embodiment, the moving assembly further includes a first transmission rod, a second transmission rod and a second bevel gear, the first transmission rod is arranged parallel to the support column and can be rotatably arranged on the support column, a second guide hole is provided at the top end of the first transmission rod, the bottom end of the second transmission rod can slide and penetrate in the second guide hole along the height direction of the support column, and the top end can be rotatably arranged on the extension column, multiple groups of second slide grooves are provided around the second guide hole, multiple groups of second sliders are provided around the second transmission rod, multiple groups of second sliders are slidably arranged in multiple groups of second slide grooves, the top end of the second transmission rod and one end of the second screw are both provided with the second bevel gear, and the two groups of the second bevel gears are meshed. By rotating the first transmission rod, the first transmission rod rotates through multiple groups of second slide grooves and cooperates with the second slider to drive the second transmission rod to rotate, and the second transmission rod rotates through the meshing of two groups of second bevel gears to drive the second screw to rotate, which is convenient for driving the second screw to rotate, and there is no need to adjust the height when adjusting the horizontal position of the signboard, thereby improving the safety of the device.

[0019] In one of the embodiments, the mounting seat is provided with two groups of through slots, and the signboard is provided with two groups of blocks. The two groups of blocks can pass through the two groups of slots. A connecting shaft is provided on the mounting seat, and a fixing rod is rotatably provided on the connecting shaft. The ends of the two groups of blocks passing through the two groups of slots are provided with fixing slots. Rotating the fixing rod can make the fixing rod be clamped in the two groups of fixing slots. A torsion spring is sleeved on the connecting shaft, and the two ends of the torsion spring are respectively connected to the fixing rod and the connecting shaft. When replacing the signboard, the torsion spring is twisted by rotating the fixing rod. When the fixing rod rotates and withdraws from the two sets of fixing grooves, the two sets of card blocks can be taken out from the two sets of card slots, thereby removing the signboard. When installing the signboard, the two sets of card blocks are inserted into the two sets of card slots, and then the force on the fixing rod is canceled. The reaction force of the torsion spring drives the fixing rod to rotate in the opposite direction. The fixing rod rotates in the opposite direction so that the fixing rod is stuck in the two sets of fixing grooves to fix the card blocks, thereby installing the signboard. The signboard is easy to disassemble and install, and it is convenient to replace the signboard. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation of the utility model, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0021] Figure 1 A schematic diagram of the three-dimensional structure of a traffic sign pole provided by an embodiment of the utility model;

[0022] Figure 2 for Figure 1 An exploded view of a traffic sign pole shown;

[0023] Figure 3 for Figure 1 An exploded view of a lifting assembly in a traffic sign pole is shown;

[0024] Figure 4 for Figure 1 An exploded view of a mounting base in a traffic sign pole shown;

[0025] Figure 5 for Figure 1 An exploded view of a moving component in a traffic sign pole is shown.

[0026] Reference numerals:

[0027] 10. Support column; 101. First guide hole; 1011. First slide groove; 102. Installation cavity;

[0028] 20. Extension column; 201. Mounting rod; 202. First sliding block;

[0029] 30. Lifting assembly; 301. First screw rod; 302. First bevel gear; 303. Rotating shaft; 304. First hand wheel;

[0030] 40, mounting seat; 401, through slot; 402, limiting bolt; 403, clamping slot; 404, connecting shaft; 405, torsion spring; 406, fixing rod;

[0031] 50, signboard; 501, card block; 5011, fixing slot;

[0032] 60. Moving assembly; 601. Second screw rod; 602. Second bevel gear; 603. Second transmission rod; 6031. Second slider; 604. First transmission rod; 6041. Second guide hole; 6042. Second hand wheel. DETAILED DESCRIPTION

[0033] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0034] See also Figures 1 to 5 In one embodiment, a traffic sign pole includes a support column 10, an extension column 20, a lifting assembly 30, a mounting seat 40 and a moving assembly 60.

[0035] The bottom end of the support column 10 can be fixed on the bottom surface by bolts. The extension column 20 can be slidably arranged on the support column 10 along the height direction of the support column 10. Specifically, a first guide hole 101 is provided at the top of the support column 10, and the bottom end of the extension column 20 can be slidably arranged in the first guide hole 101 along the height direction of the support column 10. A plurality of first slide grooves 1011 are provided around the first guide hole 101, and a plurality of first sliders 202 are provided around the extension column 20. The plurality of first sliders 202 are slidably arranged in the plurality of first slide grooves 1011. The first guide hole 101 is provided to cooperate with the extension column 20 to improve the sliding stability of the extension column 20, and the extension column 20 is provided in the support column 10 to reduce the volume of the extension column 20 and the support column 10. The plurality of first slide grooves 1011 and the plurality of first sliders 202 can be provided to cooperate to avoid the relative rotation between the extension column 20 and the support column 10 when the extension column 20 slides.

[0036] The lifting assembly 30 is arranged on the support column 10 and connected to the extension column 20. The lifting assembly 30 can be adjusted to drive the extension column 20 to slide. Two groups of mounting rods 201 are arranged at the top of the extension column 20. The mounting seat 40 can be radially slidably arranged on the two groups of mounting rods 201 along the support column 10. A signboard 50 is arranged on the mounting seat 40. Specifically, two groups of through grooves 401 are provided on the mounting seat 40. The two groups of through grooves 401 can be radially slidably arranged on the two groups of mounting rods 201 along the support column 10. The bottom end of the mounting seat 40 is threadedly connected with a limiting bolt 402. A limiting slide groove is provided at the bottom end of one group of mounting rods 201. One end of the limiting bolt 402 can be radially slidably arranged in the limiting slide groove along the support column 10. When the mounting seat 40 slides, the mounting seat 40 drives the limiting bolt 402 to slide. At this time, the limiting bolt 402 cooperates with the limiting slide groove to prevent the mounting seat 40 from slipping off the two groups of mounting rods 201.

[0037] The moving assembly 60 is disposed on the extension column 20 and connected to the mounting seat 40 . The moving assembly 60 can be adjusted to drive the mounting seat 40 to slide.

[0038] See also Figure 2 , Figure 3 On the basis of the above embodiment, further, the lifting assembly 30 includes a first screw rod 301, a rotating shaft 303 and a first bevel gear 302; the first screw rod 301 is rotatably arranged in the first guide hole 101, and is arranged parallel to the support column 10, and is threadedly connected to the extension column 20, the rotating shaft 303 is rotatably arranged on the support column 10, and the support column 10 is provided with a mounting cavity 102, one end of the first screw rod 301 and the rotating shaft 303 extends into the mounting cavity 102, and is respectively provided with a first bevel gear 302, and two sets of first bevel gears 302 are meshed. Specifically in this embodiment, a first hand wheel 304 is arranged on the rotating shaft 303. The first hand wheel 304 is arranged to facilitate the rotation of the rotating shaft 303.

[0039] When the first screw 301 is stopped, the first screw 301 is rotated to rotate and the first screw 301 is engaged with the extension column 20 thread. The extension column 20 slides upward and drives the mounting seat 40 and the sign board 50 to move upward through the two sets of mounting rods 201, thereby increasing the installation height of the sign board 50. Conversely, by rotating the rotating shaft 303 in the opposite direction, the first screw 301 rotates in the opposite direction and the first screw 301 is engaged with the extension column 20 thread to drive the extension column 20 to move downward. The downward movement of the extension column 20 can reduce the installation height of the sign board 50. When the installation height of the sign board 50 is adjusted, the rotating shaft 303 is stopped to stop the first screw 301 from rotating. The first screw 301 stops rotating and engages with the extension column 20 thread to fix the extension column 20, thereby fixing the installation height of the sign board 50, and adjusting the installation height of the sign board 50 is convenient.

[0040] See also Figure 2 , Figure 4 , Figure 5 On the basis of the above embodiment, further, the moving assembly 60 includes a second screw 601; the second screw 601 is rotatably arranged on the extension column 20 and is arranged parallel to the mounting rod 201, and the second screw 601 is threadedly connected to the mounting seat 40.

[0041] In the above embodiment, the mounting seat 40 can be driven to slide by rotating the second screw 601 and engaging with the thread of the mounting seat 40. The sliding of the mounting seat 40 can drive the signboard 50 to slide, and the horizontal position of the signboard 50 can be easily adjusted. The mounting seat 40 can be fixed by stopping the rotation of the second screw 601 and engaging with the thread of the mounting seat 40, thereby fixing the signboard 50. The signboard 50 can be easily fixed after the horizontal position is adjusted.

[0042] On the basis of the above embodiment, further, the moving assembly 60 also includes a first transmission rod 604, a second transmission rod 603 and a second bevel gear 602, the first transmission rod 604 is arranged parallel to the support column 10, and can be rotatably arranged on the support column 10, the top of the first transmission rod 604 is provided with a second guide hole 6041, the bottom of the second transmission rod 603 can slide and penetrate in the second guide hole 6041 along the height direction of the support column 10, and the top is rotatably arranged on the extension column 20, the second guide hole 6041 is provided with multiple groups of second slide grooves around the side, the second transmission rod 603 is provided with multiple groups of second sliders 6031 around the side, and the multiple groups of second sliders 6031 are slidably arranged in the multiple groups of second slide grooves, the top of the second transmission rod 603 and one end of the second screw 601 are both provided with a second bevel gear 602, and the two groups of second bevel gears 602 are meshed. Specifically in this embodiment, the bottom of the first transmission rod 604 is provided with a second hand wheel 6042. By providing the second hand wheel 6042, it is convenient to drive the first transmission rod 604 to rotate.

[0043] In the above embodiment, by rotating the first transmission rod 604, the first transmission rod 604 rotates through multiple sets of second slide grooves and cooperates with the second slider 6031 to drive the second transmission rod 603 to rotate. The second transmission rod 603 rotates through the engagement of two sets of second bevel gears 602 to drive the second screw 601 to rotate, which is convenient for driving the second screw 601 to rotate. When adjusting the horizontal position of the signboard 50, there is no need to climb up to adjust, thereby improving the safety of the device.

[0044] See also Figure 2 , Figure 4 In one embodiment, two groups of through-going slots 403 are provided on the mounting base 40, and two groups of card blocks 501 are provided on the signboard 50. The two groups of card blocks 501 can pass through the two groups of slots 403. A connecting shaft 404 is provided on the mounting base 40, and a fixing rod 406 is rotatably provided on the connecting shaft 404. The ends of the two groups of card blocks 501 passing through the two groups of slots 403 are both provided with fixing grooves 5011. Rotating the fixing rod 406 can make the fixing rod 406 be stuck in the two groups of fixing grooves 5011. A torsion spring 405 is sleeved on the connecting shaft 404, and the two ends of the torsion spring 405 are respectively connected to the fixing rod 406 and the connecting shaft 404.

[0045] In the above embodiment, when replacing the signboard 50, the torsion spring 405 is twisted by rotating the fixing rod 406. When the fixing rod 406 rotates and withdraws from the two groups of fixing grooves 5011, the two groups of card blocks 501 can be taken out from the two groups of card slots 403, thereby removing the signboard 50. When installing the signboard 50, the two groups of card blocks 501 are inserted into the two groups of card slots 403, and then the force on the fixing rod 406 is canceled. At this time, the reaction force of the torsion spring 405 drives the fixing rod 406 to rotate in the opposite direction. The fixing rod 406 rotates in the opposite direction so that the fixing rod 406 is stuck in the two groups of fixing grooves 5011 to fix the card block 501, thereby installing the signboard 50. The disassembly and installation of the signboard 50 is convenient, and the replacement of the signboard 50 is convenient.

[0046] The specific implementation of the above-mentioned traffic sign pole is as follows:

[0047] When it is necessary to adjust the installation height of the signboard 50, the first screw 301 can be driven to rotate by rotating the rotating shaft 303 and cooperating through the two sets of first bevel gears 302. The first screw 301 rotates and cooperates with the extension column 20 thread to drive the extension column 20 to slide upward. The extension column 20 slides upward and drives the mounting seat 40 and the signboard 50 to move upward through the two sets of mounting rods 201, thereby increasing the installation height of the signboard 50. Conversely, the installation height of the signboard 50 can be lowered by rotating the rotating shaft 303 in the opposite direction. It is convenient to adjust the installation height of the signboard 50. When the installation height of the signboard 50 is adjusted, the extension column 20 can be fixed by stopping rotating the rotating shaft 303. It is convenient to fix the installation height of the signboard 50. When the extension column 20 slides, the extension column 20 drives the second transmission rod 603 to slide in the first transmission rod 604.

[0048] When it is necessary to adjust the horizontal installation position of the sign board 50, by rotating the first transmission rod 604, the first transmission rod 604 rotates through multiple groups of second slide grooves and cooperates with the second sliding block 6031 to drive the second transmission rod 603 to rotate, and the second transmission rod 603 rotates through the two groups of second bevel gears 602 to mesh and drive the second screw rod 601 to rotate. The second screw rod 601 rotates and cooperates with the thread of the mounting seat 40 to drive the mounting seat 40 to slide. The sliding of the mounting seat 40 can drive the sign board 50 to slide, and the horizontal position of the sign board 50 can be easily adjusted. By stopping the rotation of the second transmission rod 603, the second screw 601 stops rotating and cooperates with the thread of the mounting seat 40 to fix the mounting seat 40, thereby fixing the sign board 50. The fixing of the sign board 50 after the horizontal position is adjusted is convenient. When adjusting the installation height and horizontal installation position of the sign board 50, there is no need to replace support columns 10 of different lengths and disassemble and assemble the sign board 50. It is convenient and labor-saving to adjust the installation height and horizontal position of the sign board 50, thereby improving the practicality of the device.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A traffic sign pole, characterized in that: include: A support column (10), the bottom end of which can be fixed to the bottom surface by bolts; An extension column (20) capable of being slidably disposed on the support column (10) along a height direction of the support column (10); A lifting assembly (30) is arranged on the support column (10) and connected to the extension column (20), and the lifting assembly (30) can be adjusted to drive the extension column (20) to slide; A mounting seat (40), two groups of mounting rods (201) are arranged at the top of the extension column (20), the mounting seat (40) can be radially slidably arranged on the two groups of mounting rods (201) along the support column (10), and a signboard (50) is arranged on the mounting seat (40); and The moving assembly (60) is arranged on the extension column (20) and connected to the mounting seat (40). The moving assembly (60) can be adjusted to drive the mounting seat (40) to slide.

2. A traffic sign pole according to claim 1, characterized in that: The top end of the support column (10) is provided with a first guide hole (101), and the bottom end of the extension column (20) can be slidably inserted into the first guide hole (101) along the height direction of the support column (10), and a plurality of groups of first slide grooves (1011) are provided around the first guide hole (101), and a plurality of groups of first sliding blocks (202) are provided around the extension column (20), and the plurality of groups of first sliding blocks (202) are slidably arranged in the plurality of groups of first slide grooves (1011).

3. A traffic sign pole according to claim 2, characterized in that: The lifting assembly (30) comprises a first screw rod (301), a rotating shaft (303) and a first bevel gear (302); the first screw rod (301) is rotatably arranged in the first guide hole (101), and is arranged parallel to the support column (10), and is threadedly connected to the extension column (20); the rotating shaft (303) is rotatably arranged on the support column (10); an installation cavity (102) is provided in the support column (10); one end of the first screw rod (301) and the rotating shaft (303) extend into the installation cavity (102), and the first bevel gears (302) are respectively arranged thereon, and two groups of the first bevel gears (302) are meshed.

4. A traffic sign pole according to claim 1, characterized in that: The mounting seat (40) is provided with two groups of through grooves (401), and the two groups of through grooves (401) can be radially slidably arranged on the two groups of mounting rods (201) along the support column (10). The bottom end of the mounting seat (40) is threadedly connected with a limiting bolt (402), and a limiting sliding groove is provided at the bottom end of one group of the mounting rods (201), and one end of the limiting bolt (402) can be radially slidably arranged in the limiting sliding groove along the support column (10).

5. A traffic sign pole according to claim 4, characterized in that: The moving assembly (60) comprises a second screw rod (601); the second screw rod (601) is rotatably arranged on the extension column (20) and is arranged parallel to the mounting rod (201); the second screw rod (601) is threadedly connected to the mounting seat (40).

6. A traffic sign pole according to claim 5, characterized in that: The moving assembly (60) further comprises a first transmission rod (604), a second transmission rod (603) and a second bevel gear (602); the first transmission rod (604) is arranged parallel to the support column (10) and is rotatably arranged on the support column (10); a second guide hole (6041) is provided at the top end of the first transmission rod (604); the bottom end of the second transmission rod (603) can be slidably inserted into the second guide hole (6041) along the height direction of the support column (10), and the top end is rotatably arranged on the extension column (20); a plurality of groups of second sliding grooves are provided around the second guide hole (6041); a plurality of groups of second sliding blocks (6031) are provided around the second transmission rod (603); the plurality of groups of second sliding blocks (6031) are slidably arranged in the plurality of groups of second sliding grooves; the second bevel gear (602) is provided at the top end of the second transmission rod (603) and one end of the second screw rod (601); and the two groups of the second bevel gears (602) are meshed.

7. A traffic sign pole according to claim 1, characterized in that: The mounting seat (40) is provided with two groups of through-going slots (403), the signboard (50) is provided with two groups of clamping blocks (501), the two groups of clamping blocks (501) can penetrate the two groups of slots (403), the mounting seat (40) is provided with a connecting shaft (404), a fixing rod (406) is rotatably provided on the connecting shaft (404), the ends of the two groups of clamping blocks (501) penetrating the two groups of slots (403) are provided with fixing grooves (5011), the fixing rod (406) can be locked in the two groups of fixing grooves (5011) by rotating the fixing rod (406), the connecting shaft (404) is sleeved with a torsion spring (405), the two ends of the torsion spring (405) are respectively connected to the fixing rod (406) and the connecting shaft (404).

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