Battering ram for road construction

Abstract

The utility model discloses a battering ram for road construction, which relates to the technical field of road construction equipment and comprises a battering ram main body, a plurality of fixing shafts are fixedly connected to the outer wall of the battering ram main body, a plurality of handrails are fixedly connected to the outer walls of the fixing shafts, a damping mechanism is arranged on the outer wall of the battering ram main body, and the handrail is fixedly connected to the outer wall of the battering ram main body. The damping mechanism comprises a mounting plate, the pressing plates are arranged, when equipment needs to be used and before the equipment is used, different pressing plates are selected for mounting according to the actual use condition, limiting blocks on the pressing plates are inserted into second sliding grooves, in the inserting process of the limiting blocks, the limiting blocks can extrude the second limiting blocks to enable third springs to be compressed, and the third springs are compressed; and meanwhile, a second limiting block moves to drive a sliding rod to slide in a sliding rod sleeve, the supporting and protecting effect on a third spring is achieved, the device can be freely replaced or adjusted, the installation mode of the device is simple, and meanwhile the device can be supported and protected when not used.

Description

TECHNICAL FIELD

[0001] The utility model belongs to road construction equipment technical field, especially, relate to a road construction with impact rammer. BACKGROUND

[0002] Impact rammer is a kind of for building engineering construction process, compacts the foundation, is convenient for subsequent construction's auxiliary device, it has been widely used in building construction equipment technical field;The existing building construction with shock absorbing impact rammer is by the worker hand holds the handle of impact rammer when using, controls impact rammer and compacts the ground:

[0003] The existing equipment is inconvenient for equipment shock absorption protection when using, when equipment violent vibration, can cause internal parts damage, simultaneously inconveniently according to actual use situation freely adjusts device, and when device pauses using, it is inconvenient to support equipment, can cause device to dump damage, therefore we propose a kind of road construction with impact rammer. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of road construction with impact rammer, by mounting plate, solve the existing equipment when using, simultaneously, it is inconvenient for equipment shock absorption protection, when equipment violent vibration, can cause internal parts damage, simultaneously inconveniently according to actual use situation freely adjusts device, and when device pauses using, it is inconvenient to support equipment, can cause device to dump damage problem.

[0005] To solve the above technical problem, the utility model is realized by the following technical scheme:

[0006] The utility model is a kind of road construction with impact rammer, including impact rammer main part, the outer wall of impact rammer main part is fixedly connected with several fixed axles, the outer wall of fixed axle is fixedly connected with several handrails;

[0007] The outer wall of the impact ram body is provided with a damping mechanism, the damping mechanism comprises a mounting plate, the outer wall of one end of the impact ram body away from the mounting plate is fixedly connected with a mounting plate two, the top outer wall of the mounting plate two is fixedly connected with a plurality of fixing bases, the outer wall of the fixing base is rotatably connected with a pull rod, the outer wall of the pull rod is fixedly connected with a spring, the bottom outer wall of the mounting plate is fixedly connected with a plurality of sliding rails, the inner wall of the sliding rail is slidably connected with a fixing base two, the outer wall of the fixing base two is rotatably connected with the outer wall of the pull rod, the bottom outer wall of the mounting plate is fixedly connected with a plurality of fixing bases three, the top outer wall of the mounting plate two is fixedly connected with a plurality of fixing bases four, the outer wall of the fixing base four is rotatably connected with a pull rod two, the inner wall of one end of the pull rod two away from the fixing base four is rotatably connected with a sliding block, the outer wall of the sliding block is fixedly connected with a shock absorber, the outer wall of the shock absorber is slidably connected with a sliding rail two, the outer wall of the sliding rail two is fixedly connected with the outer wall of the shock absorber, the inner wall of one end of the sliding rail two close to the sliding block is fixedly connected with a plurality of springs two, the outer wall of a plurality of the springs two is fixedly connected with the outer wall of the sliding block, and the outer wall of the mounting plate two is provided with a supporting mechanism.

[0008] Through the above technical scheme, the specific model of the impact ram body is HCD70A, which has the effects of rearranging the particles of soil or foundation material, making them more compact and stable, and improving the bearing capacity of the foundation.

[0009] Further, the supporting mechanism comprises a pressing plate, the outer wall of the pressing plate is slidably connected with the outer wall of the impact ram body, and the top outer wall of the pressing plate is fixedly connected with a limiting block.

[0010] Through the above technical scheme, different construction requirements can be realized by replacing different pressing plates, and the applicability of the device is expanded.

[0011] Further, the inner wall of one end of the impact ram body close to the limiting block is provided with a sliding groove two, the inner wall of the sliding groove two is slidably connected with a sliding rod sleeve, and the inner wall of the sliding rod sleeve is slidably connected with a sliding rod.

[0012] Through the above technical scheme, the sliding rod sleeve can limit the movement track of the sliding rod, so that the movement process of the sliding rod is more stable.

[0013] Further, the outer wall of one end of the sliding rod away from the sliding rod sleeve is fixedly connected with a limiting block two, the outer wall of the limiting block two is fixedly connected with a spring three, and the outer wall of the spring three is fixedly connected with the inner wall of the sliding groove two.

[0014] Through the above technical scheme, the spring three can extrude the limiting block two, so that the limiting block two always fixes the limiting block, preventing the pressing plate from falling off.

[0015] Further, the impact ram body is provided with a sliding groove in the inner wall of one end of the spring three, the outer wall of the sliding block is fixedly connected with the outer wall of the limiting block two.

[0016] Through the above technical scheme, the sliding block can drive the limiting block two to compress the spring three, and then cancel the locking relationship between the limiting block two and the limiting block.

[0017] Further, the outer wall of one end of the mounting plate two away from the sliding rail is fixedly connected with a plurality of arc-shaped fixing seats, the inner wall of the arc-shaped fixing seat is provided with a plurality of positioning holes, and the outer wall of the arc-shaped fixing seat is fixedly connected with a fixed shaft two.

[0018] Through the above technical scheme, by setting different positioning holes, the position of the supporting leg can be fixed by inserting the limiting shaft into different positions of the positioning hole.

[0019] Further, the outer wall of the fixed shaft two is rotatably connected with a supporting leg, the outer wall of one end of the supporting leg close to the positioning hole is fixedly connected with a limiting shaft, and the outer wall of the limiting shaft is slidably connected with the inner wall of the positioning hole.

[0020] Through the above technical scheme, the supporting leg can support the impact ram body when it is not used, so as to prevent the impact ram body from falling and being damaged.

[0021] Further, the outer wall of one end of the supporting leg away from the fixed shaft two is fixedly connected with an anti-skid pad, the outer wall of one end of the supporting leg close to the fixed shaft two is fixedly connected with a spring four, and the outer wall of the spring four is fixedly connected with the outer wall of the arc-shaped fixing seat.

[0022] Through the above technical scheme, the anti-skid pad is arranged to prevent the supporting leg from slipping, and the stability of the impact ram body is further improved.

[0023] The utility model has the following beneficial effects:

[0024] 1, the utility model discloses a pressing plate is set up, when the equipment needs to use, before use, according to actual use, select different pressing plate and install, the limiting block on the pressing plate is inserted into the sliding groove two, in the insertion process of limiting block, limiting block will extrude limiting block two and make spring three compression, and the movement of limiting block two will drive the sliding bar to slide in the sliding bar sleeve, and the supporting protection of spring three is played, prevents spring three from breaking, reaches the user according to actual use, freely changes or adjusts device, and the installation mode of device is relatively simple, and when the device stops using, it can be supported and protected, prevents the device from falling and being damaged.

[0025] 2, the utility model discloses a mounting plate is set, when the equipment is used, the impact ram main body is started, and the impact ram main body will produce violent vibration in the operation process, can cause the impact ram main body to be damaged, and the impact ram main body will drive mounting plate no. 2 to move when moving, because mounting plate and mounting plate no. 2 are installed on both sides of the damping part of the impact ram main body, when mounting plate no. 2 moves, a plurality of fixing bases are moved, and the fixing base movement drives the pull rod to move and makes the fixing base no. 2 of the other end of pull rod slide in the slide rail, reaches the effective protection of equipment, ensures the shock absorption protection of equipment when the equipment is used, and the equipment will not be damaged due to violent vibration, and the equipment is protected by buffering, thereby reducing maintenance cost.

[0026] Of course, it is not necessary for any product embodying the utility model to achieve all the advantages mentioned above simultaneously. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced the drawings needed to be used for the embodiment description, obviously, the drawings in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, other drawings can also be obtained according to these drawings.

[0028] Figure 1 It is the overall structure schematic view of the utility model;

[0029] Figure 2 It is the overall structure sectional view of the utility model;

[0030] Figure 3 It is the sectional view of the support mechanism of the utility model;

[0031] Figure 4 It is the utility model Figure 3 It is the enlarged view of A in the utility model;

[0032] Figure 5 It is the sectional view of the damping mechanism of the utility model.

[0033] In the drawings, the component list represented by each sign is as follows:

[0034] 1, impact ram main body; 101, fixed shaft; 102, handrail; 2, damping mechanism; 201, mounting plate; 202, mounting plate two; 203, fixed seat; 204, pull rod; 205, spring; 206, slide rail; 207, fixed seat two; 208, fixed seat three; 209, fixed seat four; 210, pull rod two; 211, sliding block; 212, shock absorber; 213, spring two; 214, slide rail two; 3, support mechanism; 301, limit block; 302, slide groove two; 303, slide rod sleeve; 304, slide rod; 305, spring three; 306, limit block two; 307, arc fixed seat; 308, positioning hole; 309, fixed shaft two; 310, support leg; 311, non-slip pad; 312, spring four; 313, limit shaft; 314, pressing plate; 315, slide groove; 316, push block. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] Please refer to Figures 1-5As shown, the utility model is a kind of road construction with impact rammer, including impact rammer main body 1, the outer wall of impact rammer main body 1 is fixedly connected with several fixed shafts 101, the outer wall of fixed shaft 101 is fixedly connected with several handrails 102;The outer wall of handrail 102 is slidably connected with the outer wall of fixed shaft 101, by the handrail 102 of setting, it is convenient for impact rammer main body 1 to be controlled to impact rammer main body 1 when using, the outer wall of impact rammer main body 1 is provided with damping mechanism 2, damping mechanism 2 includes mounting plate 201, the outer wall of one end of impact rammer main body 1 away from mounting plate 201 is fixedly connected with mounting plate two 202, the top outer wall of mounting plate two 202 is fixedly connected with several fixed seats 203, the outer wall of fixed seat 203 is rotatably connected with pull rod 204, the inner wall of pull rod 204 is rotatably connected with fixed seat 203, and fixed seat 203 can fix the position of pull rod 204, so that pull rod 204 can only move around the circumference of fixed seat 203 seat, the outer wall of pull rod 204 is fixedly connected with spring 205, the bottom outer wall of mounting plate 201 is fixedly connected with several slide rails 206, the inner wall of slide rail 206 is slidably connected with fixed seat two 207, the outer wall of fixed seat two 207 is rotatably connected with the outer wall of pull rod 204, the bottom outer wall of mounting plate 201 is fixedly connected with several fixed seats three 208, the outer wall of fixed seat three 208 is fixedly connected with the outer wall of mounting plate 201, by the fixed seat three 208 and fixed seat four 209 of setting, the position of pull rod two 210 can be fixed, to prevent pull rod two 210 from falling off, the top outer wall of mounting plate two 202 is fixedly connected with several fixed seats four 209, the outer wall of fixed seat four 209 is rotatably connected with pull rod two 210, the inner wall of one end of pull rod two 210 away from fixed seat four 209 is rotatably connected with sliding block 211, the outer wall of sliding block 211 is fixedly connected with shock absorber 212, the outer wall of shock absorber 212 is slidably connected with slide rail two 214, the outer wall of slide rail two 214 is slidably connected with slide rail two 214, by the shock absorber 212 of setting, impact rammer main body 1 can be buffered and protected, to prevent impact rammer main body 1 from being damaged due to violent vibration, the outer wall of slide rail two 214 is fixedly connected with the outer wall of shock absorber 212, the inner wall of one end of slide rail two 214 close to sliding block 211 is fixedly connected with several spring two 213, the outer wall of several spring two 213 is fixedly connected with the outer wall of sliding block 211, the outer wall of mounting plate two 202 is provided with support mechanism 3, the outer wall of spring two 213 is slidably connected with the outer wall of sliding block 211, by the spring two 213 of setting, sliding block 211 can be buffered and limited to a certain extent, improve the protection of impact rammer main body 1.

[0037] When the impact ram main body 1 is started, it will produce violent vibration, and the impact ram main body 1 will drive the mounting plate 201 and 02 to move, and then the pull rod 204 and the pull rod 210 will move as a whole, and through the setting of the spring 205 and the shock absorber 212 and the spring 213, the impact ram main body 1 can be buffered and protected.

[0038] The supporting mechanism 3 comprises a pressing plate 314, the outer wall of the pressing plate 314 is slidably connected with the outer wall of the impact ram main body 1, the top outer wall of the pressing plate 314 is fixedly connected with a limiting block 301, the inner wall of one end of the impact ram main body 1 close to the limiting block 301 is provided with a sliding groove 302, the inner wall of the sliding groove 302 is slidably connected with a sliding rod sleeve 303, the inner wall of the sliding rod sleeve 303 is slidably connected with a sliding rod 304, the sliding rod sleeve 303 can limit the movement track of the sliding rod 304, so that the movement process of the sliding rod 304 is more stable, the inner wall of the sliding rod sleeve 303 is slidably connected with the sliding rod 304, the outer wall of one end of the sliding rod 304 away from the sliding rod sleeve 303 is fixedly connected with a limiting block 306, the outer wall of the limiting block 306 is fixedly connected with a spring 305, the outer wall of the spring 305 is fixedly connected with the sliding groove 302, the outer wall of the spring 305 is fixedly connected with the sliding groove 302, through the color spring 305, the limiting block 306 can always be clamped in the limiting groove of the limiting block 301, so as to fix the position of the pressing plate 314, the inner wall of one end of the impact ram main body 1 close to the spring 305 is provided with a sliding groove 315, the inner wall of the sliding groove 315 is slidably connected with a pushing block 316, the outer wall of the pushing block 316 is fixedly connected with the outer wall of the limiting block 306, and the outer wall of the pushing block 316 is slidably connected with the outer wall of the sliding groove 315, through the setting of the pushing block 316, the pushing block 316 can drive the limiting block 306 to move and make the limiting block 306 compress the spring 305, so as to cancel the fixing relationship between the limiting block 306 and the limiting block 301.

[0039] The limiting block 301 on the pressing plate 314 is inserted into the sliding groove 302, the limiting block 301 will extrude the limiting block 306 to make the spring 305 contract, when the limiting block 301 moves to the appropriate position, the spring 305 will reset to extrude the limiting block 306 to always clamp the clamping groove of the limiting block 301, so as to fix the pressing plate 314.

[0040] The outer wall of one end of the mounting plate two 202 away from the slide rail 206 is fixedly connected with a plurality of arc-shaped fixing seats 307, a plurality of positioning holes 308 are formed in the inner wall of the arc-shaped fixing seat 307, the outer wall of the arc-shaped fixing seat 307 is fixedly connected with a second fixing shaft 309, the outer wall of the second fixing shaft 309 and the outer wall of the supporting leg 310 are rotatable parts, the position of the supporting leg 310 can be fixed through the second fixing shaft 309, so that the supporting leg 310 can only move in a circular motion around the second fixing shaft 309, the outer wall of the second fixing shaft 309 is rotatably connected with the supporting leg 310, the outer wall of one end of the supporting leg 310 close to the positioning hole 308 is fixedly connected with a limiting shaft 313, the outer wall of the limiting shaft 313 and the inner wall of the positioning hole 308 are slidably connected, the outer wall of the limiting shaft 313 and the outer wall of the positioning hole 308 are slidably connected, the position of the supporting leg 310 can be fixed by inserting the limiting shaft 313 into the positioning hole 308 in different positions, the outer wall of one end of the supporting leg 310 away from the second fixing shaft 309 is fixedly connected with an anti-skid pad 311, the outer wall of one end of the supporting leg 310 close to the second fixing shaft 309 is fixedly connected with a fourth spring 312, the outer wall of the fourth spring 312 and the outer wall of the arc-shaped fixing seat 307 are fixedly connected, and the outer wall of the fourth spring 312 and the outer wall of the supporting leg 310 are slidably connected. The fourth spring 312 can prevent the supporting leg 310 from moving by itself and causing the limiting shaft 313 to come off the positioning hole 308.

[0041] The supporting legs 310 are pushed, the limiting shaft 313 is inserted into different positioning holes 308, the fourth spring 312 can prevent the supporting leg 310 from moving by itself and causing the limiting shaft 313 to come off the positioning hole 308, so as to support the impact ram main body 1, prevent the impact ram main body 1 from falling, and the anti-skid pad 311 can prevent the supporting leg 310 from sliding and improve the supporting effect of the supporting leg 310.

[0042] One specific application of the embodiment is:

[0043] When the staff needs to use the device, before use, according to the actual use, select different pressing plate 314 for installation, the limiting block 301 on the pressing plate 314 is inserted into the sliding groove two 302, in the process of inserting the limiting block 301, the limiting block 301 will extrude the limiting block two 306 and make the spring three 305 compressed, at the same time, the movement of the limiting block two 306 will drive the sliding rod 304 to slide in the sliding rod sleeve 303, which supports and protects the spring three 305, preventing the spring three 305 from breaking, when the limiting block 301 moves to the appropriate position, the spring three 305 resets to compress the limiting block two 306 in the opposite direction, so that the limiting block two 306 is clamped in the limiting groove of the limiting block 301, fixing the limiting block 301 and the pressing plate 314, when the pressing plate 314 needs to be replaced, the knob 316 is pulled, the movement of the knob 316 in the sliding groove 315 will drive the limiting block two 306 to move, so that the limiting block two 306 compresses the spring three 305, and then the limiting block 301 can be pulled out, after installation is completed, the impact ram body 1 is started, the impact ram body 1 will produce violent vibration during operation, which may cause damage to the impact ram body 1, the impact ram body 1 will drive the installation plate 201 and the installation plate two 202 to move when moving, since the installation plate 201 and the installation plate two 202 are installed on both sides of the shock absorbing part of the impact ram body 1, when the installation plate two 202 moves, it will drive a plurality of fixing seats 203 to move, the movement of the fixing seat 203 will drive the pull rod 204 to move, so that the fixing seat two 207 at the other end of the pull rod 204 slides in the sliding rail 206, at the same time, the movement of the pull rod 204 will stretch the spring 205, since the spring 205 can rebound to a certain extent, it can buffer and protect the impact ram body 1, at the same time, the movement of the installation plate two 202 will drive the fixing seat four 209 and the fixing seat three 208 to move, the movement of the fixing seat three 208 and the fixing seat four 209 will drive the pull rod two 210 to move, so that the sliding block 211 moves, the movement of the sliding block 211 will extrude the shock absorber 212, at the same time, it will compress the spring two 213, the shock absorber 212 and the spring two 213 can further increase the buffering and protection effect, when the device is not in use, the supporting legs 310 are pulled to insert the limiting shaft 313 into different positioning holes 308, the spring four 312 can prevent the supporting legs 310 from moving by itself to make the limiting shaft 313 separate from the positioning hole 308, so as to support the impact ram body 1 and prevent the impact ram body 1 from falling and being damaged.

[0044] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0045] The preferred embodiments disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details and do not limit the utility model to the specific embodiments described. Obviously, according to the content of the description, many modifications and changes can be made. The description selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that the skilled in the art can well understand and utilize the utility model. The utility model is limited by the claims and the entire scope and equivalents thereof.

Claims

1. A rammer compactor for road construction comprising a rammer compactor main body (1), characterized in that: The impact ram body (1) is fixedly connected with a plurality of fixed shafts (101) on the outer wall of the impact ram body (1), and the outer wall of the fixed shaft (101) is fixedly connected with a plurality of handrails (102). The outer wall of the impact ram body (1) is provided with a damping mechanism (2), the damping mechanism (2) comprises a mounting plate (201), the outer wall of one end of the impact ram body (1) away from the mounting plate (201) is fixedly connected with a mounting plate two (202), the top outer wall of the mounting plate two (202) is fixedly connected with a plurality of fixed seats (203), the outer wall of the fixed seat (203) is rotatably connected with a pull rod (204), the outer wall of the pull rod (204) is fixedly connected with a spring (205), the bottom outer wall of the mounting plate (201) is fixedly connected with a plurality of sliding rails (206), the inner wall of the sliding rail (206) is slidably connected with a fixed seat two (207), the outer wall of the fixed seat two (207) is rotatably connected with the outer wall of the pull rod (204), the bottom outer wall of the mounting plate (201) is fixedly connected with a plurality of fixed seats three (208), the top outer wall of the mounting plate two (202) is fixedly connected with a plurality of fixed seats four (209), the outer wall of the fixed seat four (209) is rotatably connected with a pull rod two (210), the inner wall of one end of the pull rod two (210) away from the fixed seat four (209) is rotatably connected with a sliding block (211), the outer wall of the sliding block (211) is fixedly connected with a shock absorber (212), the outer wall of the shock absorber (212) is slidably connected with a sliding rail two (214), the outer wall of the sliding rail two (214) is fixedly connected with the outer wall of the shock absorber (212), the inner wall of one end of the sliding rail two (214) close to the sliding block (211) is fixedly connected with a plurality of springs two (213), the outer wall of the plurality of springs two (213) is fixedly connected with the outer wall of the sliding block (211), and the outer wall of the mounting plate two (202) is provided with a supporting mechanism (3).

2. The impact rammer for road construction according to claim 1, wherein The supporting mechanism (3) comprises a pressing plate (314), and the outer wall of the pressing plate (314) is slidably connected with the outer wall of the impact ram body (1).

3. The impact rammer for road construction according to claim 2, wherein The inner wall of one end of the impact ram body (1) close to the limiting block (301) is provided with a second sliding groove (302), the inner wall of the second sliding groove (302) is slidably connected with a sliding rod sleeve (303), and the inner wall of the sliding rod sleeve (303) is slidably connected with a sliding rod (304).

4. The impact rammer for road construction according to claim 3, wherein The outer wall of one end of the sliding rod (304) away from the sliding rod sleeve (303) is fixedly connected with a limiting block two (306), the outer wall of the limiting block two (306) is fixedly connected with a spring three (305), and the outer wall of the spring three (305) is fixedly connected with the inner wall of the second sliding groove (302).

5. The impact rammer for road construction according to claim 4, wherein The inner wall of one end of the impact ram body (1) close to the spring three (305) is provided with a sliding groove (315), the inner wall of the sliding groove (315) is slidably connected with a pushing block (316), and the outer wall of the pushing block (316) is fixedly connected with the outer wall of the limiting block two (306).

6. The impact rammer for road construction according to claim 5, wherein The outer wall of one end of the mounting plate two (202) is fixedly connected with a plurality of arc-shaped fixing seats (307) away from the slide rail (206), a plurality of positioning holes (308) are formed in the inner wall of the arc-shaped fixing seat (307), and the outer wall of the arc-shaped fixing seat (307) is fixedly connected with a second fixing shaft (309).

7. The impact rammer for road construction according to claim 6, wherein The outer wall of the second fixing shaft (309) is rotatably connected with a supporting leg (310), the outer wall of one end of the supporting leg (310) close to the positioning hole (308) is fixedly connected with a limiting shaft (313), and the outer wall of the limiting shaft (313) is slidably connected with the inner wall of the positioning hole (308).

8. The impact rammer for road construction according to claim 7, characterized by The outer wall of one end of the supporting leg (310) away from the second fixing shaft (309) is fixedly connected with an anti-skid pad (311), The outer wall of one end of the supporting leg (310) close to the second fixing shaft (309) is fixedly connected with a fourth spring (312), The outer wall of the fourth spring (312) is fixedly connected with the outer wall of the arc-shaped fixing seat (307).

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