CN112813885B

CN112813885B - Highway anticollision loss prevention guardrail

Info

Publication number: CN112813885B
Application number: CN202110138797.1A
Authority: CN
Inventors: 郭超; 马晋; 李彦伟; 王辉辉; 苏鹏
Original assignee: Shandong Junan Road Engineering Co ltd
Current assignee: Shandong Junan Road Engineering Co Ltd
Priority date: 2021-01-23
Filing date: 2021-01-23
Publication date: 2022-09-06
Anticipated expiration: 2041-01-23
Also published as: CN112813885A

Abstract

The invention discloses a road anti-collision damage-prevention guardrail which comprises a guardrail main body, wherein the guardrail main body comprises supporting columns and protection units, the supporting columns are arranged on two sides of a road at equal intervals, each group of protection units are respectively arranged in a gap between every two groups of supporting columns, and the outer sides of the supporting columns are provided with telescopic mechanisms. The protection unit is inclined towards the lower right corner integrally, so that the guidance of an automobile in the collision process is facilitated, the protection unit can be deviated after the automobile is in the straight-face collision, the impact force of the front collision is weakened as much as possible, the protective guard is effectively protected, meanwhile, when the protective guard is inclined, the elastic block made of hard elastic rubber is matched, the collision force of the automobile can be effectively reduced, the protective guard is prevented from being damaged to a large extent and a large range due to the fact that the automobile has too large collision force, the necessity of replacing the protective guard in a large quantity is reduced, materials are effectively saved, excessive spreading waste of the materials is avoided, and the national call for energy conservation and environmental protection is responded.

Description

Highway anticollision loss prevention guardrail

Technical Field

The invention relates to the field of road administration, in particular to a road anti-collision loss-prevention guardrail.

Background

The anti-collision guardrail is a very common road traffic safety device, is widely applied to certain dangerous areas, such as a turning part of a road, an exit and an entrance of the road, a highway with higher speed and the like, has a very necessary traffic safety infrastructure, can effectively play a role of prevention and warning and safety protection, reduces the loss generated after an accident occurs, furthest protects the safety of lives and properties of people from being infringed, is very necessary for building safe anti-collision series projects such as anti-collision guardrails with better anti-collision effect in areas such as expressways, first-level roads, second-level roads, roads with higher speed, provincial roads, county roads, rural road scenic areas, large parking lots and the like, and has the main function of preventing the traffic accidents that abnormal running vehicles cross the road or cross a central separation zone to enter opposite lanes due to driver errors or other reasons, the road side pedestrian, the building, the automobile driver and the vehicle passenger are protected, and the functions of guiding the sight of the driver, increasing the driving safety and beautifying the road environment are achieved.

But current crash barrier shock-absorbing capacity is generally relatively poor, and when the vehicle hit, under its huge impulsive force effect, because crash barrier design firm enough, anti striking ability reinforce, and shock-absorbing capacity is not good enough moreover, not only can make crash barrier body structure warp and lead to the damage and the waste of resource, still can scratch vehicle or personnel easily, causes the damage of car and threatens personnel's safety even

Disclosure of Invention

The invention aims to provide a road anti-collision damage-prevention guardrail to solve the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: a highway anti-collision damage-prevention guardrail comprises a guardrail main body, wherein the guardrail main body comprises supporting columns and protection units, the supporting columns are arranged on two sides of a highway at equal intervals, each group of protection units are respectively arranged in gaps between every two groups of supporting columns, a telescopic mechanism is arranged on the outer side of each supporting column, a first groove is formed in each supporting column, and a first roller is arranged in each first groove in a sliding mode;

the protection unit comprises a support positioned at one end of the support, a protection plate is welded at one end of the support, a concave surface is arranged at the middle position of the protection plate, and an anti-collision mechanism is fixedly connected at one end of the protection plate in the concave surface;

the anti-collision mechanism comprises a support rod and a fixed plate which are positioned inside a concave surface, the middle position of the support rod is connected with an inclined plate through a pin shaft in a hinged manner, the joint of the inclined plate and the support rod is provided with a torsion spring, one end of the inclined plate is provided with a second groove, the inner wall of the second groove is connected with a second roller through a pin shaft in a hinged manner, the other end of the inclined plate is provided with a through groove, the inner wall of the through groove is connected with a linkage rod through a pin shaft in a hinged manner, one side of the inclined plate is provided with a support shell, one end of the support shell is provided with a third groove, the inner wall of the third groove is connected with a third roller through a pin shaft in a hinged manner, one side of the fixed plate is provided with a sliding groove, the inside of the sliding groove is connected with a sliding block in a sliding manner, one side of the sliding block is welded with the linkage rod, one side of the fixed plate is fixedly connected with an elastic block, the inside of the outer side of the support is provided with an inclined first groove, and the first recess in left side is the form that the left side is high right low, and the first recess in right side is the form that the left side is low right high, the fixed plate top is connected with first dead lever and second dead lever respectively, the opposite side and the second dead lever of one side of elastic block contact.

Preferably, telescopic machanism is including the fixed block that is located the pillar both sides, and is a set of the front surface of fixed block is connected with first telescopic link through the round pin axle is articulated, and is a set of the front surface of fixed block is connected with the second telescopic link through the round pin axle is articulated.

Preferably, the second mounting block is sleeved outside the first telescopic rod, a second through hole is formed in the second mounting block, a second spring is connected to the inner wall of the second through hole in a welded mode, and the top of the second spring is connected with the bottom of the first telescopic rod in a welded mode.

Preferably, a first mounting block is sleeved outside the second telescopic rod, a first through hole is formed in the first mounting block, a first spring is connected to the inner wall of the first through hole in a welded mode, the top of the first spring is connected with the bottom of the outer side of the second telescopic rod in a welded mode, mounting pads are arranged on the bottom of the first mounting block and the bottom of the second mounting block, and the bottom of each mounting pad is fixedly connected with the top of the support through a bolt.

Preferably, one side of each of the first fixing rod and the second fixing rod is welded with a stop block, two sides of the inside of the concave surface are provided with moving grooves, one end of each of the first fixing rod and the second fixing rod is provided with a moving block, and the moving block is slidably connected with the moving grooves.

Preferably, the elastic block is made of hard elastic rubber, and one side of the elastic block is in contact with the second fixing rod.

Preferably, the two ends of the inner wall of the first groove are provided with clamping grooves, the two ends of the first fixing rod and the second fixing rod are provided with clamping blocks, and the clamping blocks are connected with the clamping grooves in a sliding mode.

3. Advantageous effects

1. According to the automobile damping device, the inclined plate can be in an inclined state under the action of the torsion spring, when an automobile collides with the inclined plate, the inclination degree of the inclined plate is increased, the second roller and the third roller are made of hard elastic rubber, the automobile firstly collides with the second roller, then the inclined plate is inclined, the third roller starts to move outwards, the second roller moves inwards, the third roller and the second roller are enabled to be positioned on the same horizontal plane, the third roller and the second roller can well damp and protect the automobile, and meanwhile, the automobile can be properly decelerated.

2. According to the automobile guardrail, the plurality of groups of inclined plates are hinged to the same linkage rod through the pin shaft, so that when an automobile collides part of the inclined plates, the inclined plate inclines to drive the linkage rod to move rightwards, the linkage rod and the sliding block can move downwards in the sliding groove under the action of the stop block, meanwhile, the linkage rod can drive the fixing plate and the first fixing rod to move rightwards in the moving groove, and the elastic block at one end of the first fixing rod is made of hard elastic rubber, so that the linkage rod in the next group of protection units can be driven to move rightwards after the elastic block is compressed to the maximum degree, and further, part of impact force of the automobile can be dispersed by the plurality of groups of linkage rods and the elastic block, and the guardrail main body is prevented from being damaged to a greater degree.

3. In the invention, the second fixed rod can also move rightwards when the arranged first fixed rod moves rightwards, because the tops of the first fixed rod and the second fixed rod are respectively fixed with two groups of first rollers, and the first groove is inclined, and in the two groups of first rollers, the first roller at the top of the first fixed rod is positioned at the lower end surface position of the first groove, and the first roller at the top of the second fixed rod is positioned at the high end surface position of the first groove, when the first fixed rod moves rightwards, the first roller at the top of the first fixed rod can slide rightwards and downwards, so that the first fixed rod drives the right end surface of the protection unit to move downwards, and the second fixed rod also moves rightwards, and the first roller at the top of the second fixed rod can slide rightwards and upwards, so that the second fixed rod drives the left end surface of the protection unit to move upwards, and the protection unit is in a state of inclining rightwards and downwards, the help car has a guiding nature when the striking for the car can make the protection unit take place the skew after the straight-sided striking, has weakened the impact force of head-on collision as far as, has also given the driver to have more times to put the car of stopping, avoids the car directly to hit the guardrail and takes place great loss, has also protected personnel's the security of lives and property as far as possible simultaneously.

4. According to the automobile protection plate, the first spring and the second spring can be compressed when the protection plate inclines, and the elastic block made of hard elastic rubber is matched, so that the impact force of an automobile can be effectively reduced, the injury probability of personnel is reduced, and unnecessary damage caused by overlarge impact force of the automobile is avoided.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a partial schematic view of the present invention;

FIG. 3 is a partial structural view of the protection unit of the present invention;

FIG. 4 is a schematic structural view of the telescoping mechanism of the present invention;

FIG. 5 is a schematic side view of the protection unit of the present invention;

fig. 6 is a schematic side view of the crash prevention mechanism of the present invention.

In the figure: 1. a guardrail main body; 2. a pillar; 201. a first groove; 202. a first roller; 203. a card slot; 3. a protection unit; 301. a support; 302. a protection plate; 303. a concave surface; 4. an anti-collision mechanism; 401. a strut; 402. an inclined plate; 403. a second groove; 404. a second roller; 405. a through groove; 406. a linkage rod; 407. supporting a shell; 408. a third groove; 409. a third roller; 410. a fixing plate; 411. a chute; 412. a slider; 413. a first fixing lever; 414. a second fixing bar; 415. a stopper; 416. a moving groove; 417. an elastic block; 418. a torsion spring; 5. a telescoping mechanism; 501. a fixed block; 502. a first telescopic rod; 503. a second telescopic rod; 504. a mounting mat; 505. a first mounting block; 506. a first through hole; 507. a first spring; 508. a second mounting block; 509. a second through hole; 510. a second spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Referring to fig. 1-6, an embodiment of the present invention is shown: a highway anti-collision damage-prevention guardrail comprises a guardrail main body 1, wherein the guardrail main body 1 comprises supporting columns 2 and protection units 3, the supporting columns 2 are arranged on two sides of a highway at equal intervals, each group of protection units 3 is respectively arranged in a gap between every two groups of supporting columns 2, a telescopic mechanism 5 is arranged on the outer side of each supporting column 2, a first groove 201 is formed in each supporting column 2, and a first roller 202 is arranged in each first groove 201 in a sliding mode;

the protection unit 3 comprises a support 301 positioned at one end of the support column 2, one end of the support 301 is connected with a protection plate 302 in a welding mode, a concave surface 303 is arranged in the middle of the protection plate 302, and an anti-collision mechanism 4 is fixedly connected to one end of the protection plate 302, which is positioned in the concave surface 303;

the anti-collision mechanism 4 comprises a support rod 401 and a fixing plate 410 which are positioned inside the concave surface 303, an inclined plate 402 is hinged at the middle position of the support rod 401 through a pin shaft, a torsion spring 418 is arranged at the joint of the inclined plate 402 and the support rod 401, a second groove 403 is arranged at one end of the inclined plate 402, a second roller 404 is hinged at the inner wall of the second groove 403 through a pin shaft, a through groove 405 is arranged at the other end of the inclined plate 402, a linkage rod 406 is hinged at the inner wall of the through groove 405 through a pin shaft, a support shell 407 is arranged at one side of the inclined plate 402, a third groove 408 is arranged at one end of the support shell 407, a third roller 409 is hinged at the inner wall of the third groove 408 through a pin shaft, a sliding groove 411 is arranged at one side of the fixing plate 410, a sliding block 412 is slidably connected inside the sliding groove 411, one side of the sliding block 412 is welded with the linkage rod 406, an elastic block 417 is fixedly connected at one side of the fixing plate 410, the inside first recess 201 that all is provided with the slope of pillar 2 outside, and the first recess 201 in left side is the high right low form in left side, and the first recess 201 in right side is the low right high form in left side, and the fixed plate 410 top is connected with first dead lever 413 and second dead lever 414 respectively, and the opposite side and the second dead lever 414 of one side of elastic block 417 contact.

In the invention, the second fixing rod 414 moves rightwards while the first fixing rod 413 moves rightwards, because the tops of the first fixing rod 413 and the second fixing rod 414 are respectively fixed with the two groups of first rollers 202, the first groove 201 is inclined, and in the two groups of first rollers 202, the first roller 202 at the top of the first fixing rod 413 is positioned at the lower end surface position of the first groove 201, the first roller 202 at the top of the second fixing rod 414 is positioned at the high end surface position of the first groove 201, when the first fixing rod 413 moves rightwards, the first roller 202 at the top of the first fixing rod 413 can slide rightwards and downwards, so that the first fixing rod 413 drives the right end surface of the protection unit 3 to move downwards, and the second fixing rod 414 also moves rightwards, the first roller 202 at the top of the second fixing rod 414 can slide rightwards and upwards, so that the second fixing rod 414 drives the left end surface of the protection unit 3 to move upwards, and then make the whole lower angle tilt state that is of protection unit 3, help the car have a guiding nature when striking for the car can make the protection unit take place the skew after the straight-face striking, has weakened the impact force of head-on collision as far as, has also given the driver to have more time to put the car of stopping, avoids the car directly to hit the guardrail and takes place great loss, has also protected personnel's the security of lives and property simultaneously as far as possible.

Please refer to fig. 4, the telescopic mechanism 5 includes fixing blocks 501 disposed at two sides of the pillar 2, a first telescopic rod 502 is hinged to a front surface of one of the fixing blocks 501 via a pin, a second telescopic rod 503 is hinged to a front surface of one of the fixing blocks 501 via a pin, a second mounting block 508 is sleeved to an outer portion of the first telescopic rod 502, a second through hole 509 is disposed inside the second mounting block 508, a second spring 510 is welded to an inner wall of the second through hole 509, a top portion of the second spring 510 is welded to a bottom portion of the first telescopic rod 502, a first mounting block 505 is sleeved to an outer portion of the second telescopic rod 503, a first through hole 506 is disposed inside the first mounting block 505, a first spring 507 is welded to an inner wall of the first through hole 506, a top portion of the first spring 507 is welded to a bottom portion of an outer side of the second telescopic rod 503, mounting pads 504 are disposed at a bottom portion of the first mounting block 505 and a bottom portion of the second mounting block 508, and the bottom of the mounting pad 504 is fixedly connected with the top of the bracket 301 through bolts.

This kind of highway anticollision loss prevention guardrail can compress when protection plate 302 inclines through first spring 507 and the second spring 510 that sets up, and for the slope of cooperation protection plate 302, first telescopic link 502 and second telescopic link 503 are located the position of second spring 510 and first spring 507 inner wall respectively inequality, cooperation stereoplasm elasticity rubber material's elastic block 417, the at utmost has reduced the impact of car, personnel's injury probability has also been reduced simultaneously, also avoid the car impact too big and take place unnecessary damage simultaneously.

Please refer to fig. 3, one side of each of the first fixing rod 413 and the second fixing rod 414 is welded with a stopper 415, two sides of the inside of the concave surface 303 are provided with a moving slot 416, one end of each of the first fixing rod 413 and the second fixing rod 414 is provided with a moving block, and the moving block is slidably connected with the moving slot 416.

This kind of highway anticollision loss prevention guardrail is mutually supported with shifting chute 416 through the movable block that sets up (not shown), and dog 415 supports concave surface 303, makes things convenient for first dead lever 413 and second dead lever 414 to slide right only then, the slope of the guard plate 302 of being convenient for.

Please refer to fig. 3, the elastic block 417 is made of hard elastic rubber, and one side of the elastic block 417 contacts with the second fixing rod 414.

This kind of highway anticollision loss prevention guardrail compresses to can drive the trace 406 in a set of protection unit down and carry out the motion right after the at utmost through the elastic block 417 who sets up, and then makes the partial impact of car can be by multiunit trace 406 and the trace 406 with

The elastic block 417 disperses to avoid damaging the guardrail body 1 to a greater extent, and of course, the elastic block 417 always contacts the next set of second fixing rods 414, so that the displacement distance of the next set of second fixing rods 414 is less than the distance between the first fixing rod 413 and the second fixing rod 414 inside the collision protection unit 3, and then the force is reasonably dispersed.

Please refer to fig. 4, two ends of the inner wall of the first groove 201 are both provided with a locking groove 203, two ends of the first fixing rod 413 and the second fixing rod 414 are both provided with a locking block, and the locking block is slidably connected with the locking groove 203.

The road anti-collision damage-prevention guardrail can be clamped into the clamping groove 203 through clamping blocks (not shown) at two ends of the first fixing rod 413 and the second fixing rod 414, so that the directional movement of the first fixing rod 413 and the second fixing rod 414 is better ensured.

The working principle is as follows: when the guardrail is used, the pillars 2 are sequentially installed along two sides of a road at equal intervals, then the brackets 301 on the protection unit 3 and the mounting pads 504 on the telescopic mechanism 5 are installed through bolts, and further the installation of the guardrail main body 1 is completed, under a normal state, the inclined plate 402 is in an inclined state under the action of the torsion spring 418, when an automobile hits the inclined plate 402, the inclined degree of the inclined plate 402 is increased, because the second roller 404 and the third roller 409 are made of hard elastic rubber, the automobile hits the second roller 404 firstly, then the inclined plate 402 inclines, the third roller 409 starts to move downwards, the second roller 404 moves upwards, so that the third roller 409 and the second roller 404 are positioned on the same horizontal plane, the third roller 409 and the second roller 404 can well absorb shock and protect the automobile, and can properly decelerate the automobile, and simultaneously, because a plurality of groups of inclined plates 402 are hinged on the same linkage rod 406 through a pin shaft, therefore, when the automobile collides with the partial inclined plate 402, the partial inclined plate 402 inclines to drive the linkage rod 406 to move rightwards, under the action of the stopper 415, the linkage rod 406 and the sliding block 412 move downwards in the sliding slot 411, and the linkage rod 406 also drives the fixing plate 410 and the first fixing rod 413 to move rightwards in the moving slot 416, because the elastic block 417 at one end of the first fixing rod 413 is made of hard elastic rubber, the linkage rod 406 in the next set of protection unit is driven to move rightwards after the elastic block 417 is compressed to the maximum extent, so that partial impact force of the automobile can be dispersed by the groups of linkage rods 406 and elastic blocks 417, and the guardrail main body 1 is prevented from being damaged to a greater extent, meanwhile, because the first fixing rod 413 moves rightwards, the second fixing rod 414 also moves rightwards, and simultaneously the tops of the first fixing rod 413 and the second fixing rod 414 are respectively fixed with the two groups of first rollers 202, in addition, the first groove 201 is inclined, and in the two groups of first rollers 202, the first roller 202 at the top of the first fixing rod 413 is located at the lower end surface of the first groove 201, the first roller 202 at the top of the second fixing rod 414 is located at the higher end surface of the first groove 201, when the first fixing rod 413 moves to the right, the first roller 202 at the top of the first fixing rod 413 can slide to the lower right corner, so that the first fixing rod 413 drives the right end surface of the protection unit 3 to move downwards, the second fixing rod 414 also moves to the right, the first roller 202 at the top of the second fixing rod 414 can slide to the upper right corner, so that the second fixing rod 414 drives the left end surface of the protection unit 3 to move upwards, so that the protection unit 3 is integrally in a lower corner inclined state, which helps the automobile to have guidance during collision, so that the automobile can shift the protection unit after straight collision, and impact force of the front face is reduced as much as possible, the driver has also been given more times and has been put the car of stopping, avoid the car directly to hit the guardrail and take place great loss, also protected personnel's life and property safety as far as simultaneously, and when protection plate 302 inclines, first spring 507 and second spring 510 can compress, and the elasticity piece 417 of stereoplasm elasticity rubber material is being cooperated, and further the impact with the car reduces, has reduced personnel's injury probability, and the existence of elasticity piece 417 has also prolonged first spring 507 and second spring 510's life simultaneously.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof.

Claims

1. A road anti-collision damage-prevention guardrail comprises a guardrail main body (1) and is characterized in that the guardrail main body (1) comprises pillars (2) and protection units (3), the pillars (2) are located on two sides of a road and installed at equal intervals, each protection unit (3) is respectively located in a gap between every two groups of pillars (2), a telescopic mechanism (5) is arranged on the outer side of each pillar (2), a first groove (201) is formed in each pillar (2), and first idler wheels (202) are arranged in each first groove (201) in a sliding mode;

the protection unit (3) comprises a support (301) positioned at one end of the support column (2), one end of the support (301) is connected with a protection plate (302) in a welding mode, a concave surface (303) is arranged in the middle of the protection plate (302), and an anti-collision mechanism (4) is fixedly connected to one end of the protection plate (302) positioned in the concave surface (303);

the anti-collision mechanism (4) comprises a support rod (401) and a fixing plate (410) which are located inside a concave surface (303), a tilting plate (402) is hinged to the middle position of the support rod (401) through a pin shaft, a torsion spring (418) is arranged at the joint of the tilting plate (402) and the support rod (401), a second groove (403) is formed in one end of the tilting plate (402), a second roller (404) is hinged to the inner wall of the second groove (403) through a pin shaft, a through groove (405) is formed in the other end of the tilting plate (402), a linkage rod (406) is hinged to the inner wall of the through groove (405) through a pin shaft, a support shell (407) is arranged on one side of the tilting plate (402), a third groove (408) is formed in one end of the support shell (407), a third roller (409) is hinged to the inner wall of the third groove (408) through a pin shaft, a sliding groove (411) is formed in one side of the fixing plate (410), and the inside sliding connection of spout (411) has slider (412), one side and trace (406) welded connection of slider (412), one side fixed connection elastic block (417) of fixed plate (410), pillar (2) outside inside all is provided with first recess (201) of slope, and first recess (201) in left side are high right side low form, and first recess (201) in right side are low right side high form, fixed plate (410) top is connected with first dead lever (413) and second dead lever (414) respectively, the opposite side and the second dead lever (414) of one side of elastic block (417) contact.

2. A road crash barrier according to claim 1 wherein: telescopic machanism (5) are including fixed block (501) that are located pillar (2) both sides, and are a set of the front surface of fixed block (501) is connected with first telescopic link (502) through the round pin axle is articulated, and is a set of the front surface of fixed block (501) is connected with second telescopic link (503) through the round pin axle is articulated.

3. A road crash barrier according to claim 2 wherein: the outside of first telescopic link (502) has cup jointed second installation piece (508), and the inside of second installation piece (508) is provided with second through-hole (509), the inner wall welded connection of second through-hole (509) has second spring (510), and the top of second spring (510) and the bottom welded connection of first telescopic link (502).

4. A road crash barrier according to claim 2 or 3 wherein: first installation piece (505) has been cup jointed to the outside of second telescopic link (503), and the inside of first installation piece (505) is provided with first through-hole (506), the inner wall welded connection of first through-hole (506) has first spring (507), and the top of first spring (507) and the bottom welded connection in second telescopic link (503) outside, the bottom of first installation piece (505) and the bottom of second installation piece (508) all are provided with mounting pad (504), and the bottom of mounting pad (504) and the top of support (301) pass through bolt fixed connection.

5. A road crash barrier according to claim 1 wherein: one side of each of the first fixing rod (413) and the second fixing rod (414) is connected with a stop block (415) in a welding mode, two sides of the inner portion of the concave surface (303) are provided with moving grooves (416), one end of each of the first fixing rod (413) and the second fixing rod (414) is provided with a moving block, and the moving block is connected with the moving grooves (416) in a sliding mode.

6. A road crash barrier according to claim 1 wherein: the elastic block (417) is made of hard elastic rubber, and one side of the elastic block (417) is in contact with the second fixing rod (414).

7. A road crash barrier according to claim 1 wherein: the two ends of the inner wall of the first groove (201) are provided with clamping grooves (203), clamping blocks are arranged at the two ends of the first fixing rod (413) and the second fixing rod (414), and the clamping blocks are connected with the clamping grooves (203) in a sliding mode.