Explosion-proof hydrogen storage device with early warning and detection functions

Abstract

The invention discloses an explosion-proof hydrogen storage device with early warning and detection functions, and belongs to the field of gas storage tanks, the device comprises a storage tank and a plastic shell, the storage tank and the plastic shell are fixedly connected through a countersunk bolt, and a gas outlet valve body is arranged at an opening in the top end of the storage tank; a supporting leg assembly and a traction assembly are arranged on the outer side of the plastic shell; and a hydrogen generation assembly is arranged in the storage tank. When the device is used, the five groups of plastic pockets on the outer side of the vertical pipe are filled into the annular bags, the vertical pipe is inserted into a storage tank filled with a sulfuric acid solution, a worker manually drags the traction sliding block to slide downwards by a unit distance, and the cutting knife in the vertical pipe can cut one annular bag; after the annular bags are cut, metal zinc particles can be released to reach the sulfuric acid solution to generate hydrogen, and after a certain amount of hydrogen in the storage tank is released from the gas outlet valve body, the metal zinc particles in the next annular bag are cut, so that the pressure in the storage tank can be reduced.

Description

Technical Field

[0001] The invention relates to the field of gas storage tanks, and in particular to an explosion-proof hydrogen storage device with an early warning detection function. Background Art

[0002] With the development of industrial technology, modern gas tank technology has become more and more perfect. Hydrogen can form liquid under high pressure, but it takes a lot of pressure to form liquid for cleaning. The pressure that the pressure tank needs to withstand is also relatively large, and there is a risk of rupture of the pressure tank.

[0003] Secondly, the storage tank is easy to tip over when it is standing up, and the storage tank is easy to break after tipping over. In addition, the storage tank is relatively bulky and the storage tank is also troublesome during transportation. Summary of the invention

[0004] The purpose of the present invention is to provide an explosion-proof hydrogen storage device with an early warning detection function. When the device is in use, the five groups of plastic bags on the outside of the riser are loaded into annular bags, and the riser is inserted into a storage tank filled with sulfuric acid solution. The staff manually drags the pulling slider and slides down a unit distance, and the cutting knife inside the riser will cut an annular bag. After the annular bag is cut, metal zinc particles will be released to reach the sulfuric acid solution to produce hydrogen. After a certain amount of hydrogen inside the storage tank is released from the outlet valve body, the metal zinc particles inside the next annular bag will be cut, thereby reducing the pressure inside the storage tank. Compared with the existing method of storing hydrogen, the previous hydrogen storage tank directly compresses hydrogen into liquid. The pressure of this storage method is very high. If the hydrogen storage tank is hit, it is easy to rupture and leak, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an explosion-proof hydrogen storage device with an early warning detection function, comprising a storage tank and a plastic shell, wherein the storage tank and the plastic shell are fixedly connected by countersunk bolts, and a gas outlet valve body is arranged at the top opening of the storage tank; a support leg assembly and a pulling assembly are arranged on the outside of the plastic shell; a hydrogen generating assembly is arranged inside the storage tank; the hydrogen generating assembly comprises a riser inside the storage tank, a bolt head is arranged at the bottom end of the riser, a threaded opening matching the bolt head is arranged at the bottom of the storage tank, and the inner side wall of the storage tank and the threaded opening A polytetrafluoroethylene coating is provided on the top, and a sulfuric acid solution is poured into the bottom of the storage tank, and the sulfuric acid solution is one-fifth of the internal volume of the storage tank; a stabilizing mechanism is provided at the top of the riser; five groups of plastic pockets in a straight-line array are provided at the top of the riser, and the plastic pockets include bearing tiles and plastic spring pieces, a cutting wire groove is provided on the side wall of the riser, and an avoidance notch that is connected to the cutting wire groove is provided on the bearing tile, and a cutting mechanism is provided inside the riser; an annular capsule is provided between the bearing tile and the plastic spring piece, the outside of the annular capsule is a rubber capsule, and the inside of the annular capsule is wrapped with metal zinc particles.

[0006] The stabilizing mechanism comprises a filling cap at the end of the vertical pipe, and a plurality of filling sheets in an annular array are arranged on the outer side wall of the filling cap, and the outer edges of the filling sheets abut against the inner side wall of the bottle mouth of the storage tank.

[0007] The cutting mechanism includes a magnetic cutting knife, which is composed of a cylindrical block and a blade. The cross-section of the cylindrical block matches the cross-section inside the vertical pipe. The blade is inserted between the wire groove and the avoidance gap. The cylindrical block is filled with strong magnets. A magnetic pulling mechanism matching the magnetic cutting knife is provided on the outer wall of the plastic shell.

[0008] The magnetic pulling mechanism includes a pulling guide rail on the outer wall of the plastic shell, a pulling slider is slidably installed on the pulling guide rail, a push-pull rod is arranged on the outer wall of the pulling slider, and magnet tiles that attract each other with the cylindrical block are arranged on both sides of the pulling slider. The pulling slider is fixedly plugged into the side wall of the pulling guide rail through a pin rod bar.

[0009] The support leg assembly includes three rectangular shallow grooves in a circular array on the outer wall of the plastic shell, and support guide rods are fixedly installed inside the three rectangular shallow grooves. A support slider is slidably installed on the support guide rod, and the support slider is fixed and locked by a screw valve and the side wall of the support guide rod. A hinge block is also fixedly installed on the side wall of the support slider, and a support leg is rotatably arranged on one side of the hinge block. A grounding assembly is arranged at the bottom end of the support leg, and a limit strip matching the support leg is also arranged on the side wall of the hinge block. A plastic buckle matching the support leg is arranged at the bottom end of the support guide rod.

[0010] The grounding assembly comprises a steel ball at the end of a supporting leg, a threaded short rod is arranged on the steel ball, and a threaded opening matching the threaded short rod is arranged at the bottom end of the supporting leg.

[0011] The pulling assembly comprises two wheel frames on the outer side wall of the plastic shell, two rollers are arranged on the outer side wall of the wheel frame, and the wheel frame is fixedly connected to the outer side wall of the plastic shell through an assembly sheet.

[0012] A wall-leaning block is arranged at the top of the plastic shell, the outline of the wall-leaning block is L-shaped, and a rubber pad is arranged on the outer side wall of the wall-leaning block.

[0013] In summary, due to the adoption of the above technology, the beneficial effects of the present invention are:

[0014] Firstly, when the device is in use, the five groups of plastic bags on the outside of the riser are loaded into annular bags, and the riser is inserted into a storage tank filled with sulfuric acid solution. The staff manually drags the pulling slider in and slides down a unit distance, and the cutting knife inside the riser will cut an annular bag. After the annular bag is cut, metal zinc particles will be released into the sulfuric acid solution to produce hydrogen. After a certain amount of hydrogen inside the storage tank is released from the outlet valve body, the metal zinc particles inside the next annular bag will be cut, thereby reducing the pressure inside the storage tank. Compared with the existing method of storing hydrogen, the previous hydrogen storage tank directly compresses hydrogen into liquid. The pressure of this storage method is very high. If the hydrogen storage tank is hit, it is easy to rupture and leak.

[0015] Secondly, when the storage tank is erected, the staff pulls the supporting legs out of the plastic buckles, and the maximum opening angle of the supporting legs fits on the limit strips. The supporting sliders and supporting legs are pushed down along the supporting guide rods until the steel balls touch the ground. The materials inside the storage tank are emptied before the storage tank is laid down for transportation. After the rollers touch the ground, the supporting legs on the side walls of the storage tank facing away from the wheel frame can act as pulling rods. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a front view of an explosion-proof hydrogen storage device with an early warning detection function.

[0017] Figure 2 It is a schematic diagram of a side view of an explosion-proof hydrogen storage device with early warning detection function.

[0018] Figure 3 It is a schematic diagram of a cross-section of an explosion-proof hydrogen storage device with an early warning detection function.

[0019] Figure 4 This is a schematic diagram of a support guide rod for an explosion-proof hydrogen storage device with an early warning detection function.

[0020] Figure 5 This is a schematic diagram of a support slider for an explosion-proof hydrogen storage device with an early warning detection function.

[0021] Figure 6 This is a schematic diagram of a roller of an explosion-proof hydrogen storage device with an early warning detection function.

[0022] Figure 7 This is a schematic diagram of a magnetic tile of an explosion-proof hydrogen storage device with an early warning detection function.

[0023] Figure 8 This is a schematic diagram of a column of an explosion-proof hydrogen storage device with an early warning detection function.

[0024] Fig. 9 This is a schematic diagram of an annular capsule of an explosion-proof hydrogen storage device with an early warning detection function.

[0025] Fig.10 It is a schematic diagram of a chopping knife of an explosion-proof hydrogen storage device with early warning detection function.

[0026] Description of reference numerals:

[0027] Storage tank 1, air outlet valve body 101, plastic shell 2, wall block 201, support leg 3, support slider 301, screw valve 302, hinge block 303, limit stop bar 304, pulling guide rail 4, pulling slider 401, magnet tile 402, push-pull rod 403, support guide rod 5, plastic buckle 501, wheel frame 6, roller 601, assembly sheet 602, riser 7, bolt head 701, bearing tile 702, plastic spring piece 703, avoidance notch 704, cutting wire groove 705, annular bag 8, magnetic cutting knife 9, filling cap 10, filling sheet 1001. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] The present invention provides Figure 1-Figure 10The explosion-proof hydrogen storage device with early warning detection function shown in the figure comprises a storage tank 1 and a plastic shell 2, wherein the storage tank 1 and the plastic shell 2 are fixedly connected by countersunk bolts, and the top opening of the storage tank 1 is provided with a gas outlet valve body 101; the outer side of the plastic shell 2 is provided with a supporting leg assembly and a pulling assembly; the interior of the storage tank 1 is provided with a hydrogen generating assembly; the hydrogen generating assembly comprises a riser 7 inside the storage tank 1, the bottom end of the riser 7 is provided with a bolt head 701, and the bottom of the storage tank 1 is provided with a bolt head 701. The storage tank 1 and the threaded opening have matching threaded openings, and polytetrafluoroethylene coatings are provided on the inner side walls of the storage tank 1 and the threaded openings. The bottom of the storage tank 1 is perfused with sulfuric acid solution, and the sulfuric acid solution is one-fifth of the internal volume of the storage tank 1; the top of the standpipe 7 is provided with a stabilizing mechanism; the top of the standpipe 7 is provided with five groups of plastic pockets in a straight-line array, and the plastic pockets include bearing tiles 702 and plastic spring pieces 703. The side walls of the standpipe 7 are provided with cutting grooves 705, and the bearing tiles 702 are provided with avoidance notches 704 that are mutually docked with the cutting grooves 705. The standpipe 7 A cutting mechanism is arranged inside the standpipe 702; an annular capsule 8 is arranged between the bearing tile 702 and the plastic spring sheet 703, the outside of the annular capsule 8 is a rubber capsule, the inside of the annular capsule 8 is wrapped with metal zinc particles, the five groups of plastic bags outside the standpipe 7 are put into the annular capsule 8, the standpipe 7 is inserted into the storage tank 1 filled with sulfuric acid solution, the bolt head 701 at the bottom of the standpipe 7 is aligned with the threaded opening at the bottom of the storage tank 1 and inserted, the standpipe 7 and the annular capsule 8 mounted outside thereof can be located at the center of the storage tank 1, the cutting mechanism slides down a unit distance, The cutting mechanism inside the vertical pipe 7 will cut an annular capsule 8. After the annular capsule 8 is cut, the metal zinc particles will be released to reach the sulfuric acid solution to generate hydrogen. After a certain amount of hydrogen inside the storage tank 1 is released from the gas outlet valve body 101, the metal zinc particles inside the next annular capsule 8 will be cut. Compared with the hydrogen storage method of the prior art, the previous hydrogen storage tank body directly compresses hydrogen into liquid. The pressure of this storage method is very high. If the hydrogen storage tank body is prone to rupture and leakage after being hit, the present invention can reduce the pressure inside the storage tank 1.

[0030] The stabilizing mechanism includes a filling cap 10 at the end of the stand pipe 7, and a plurality of filling pieces 1001 in a circular array are arranged on the outer wall of the filling cap 10, and the outer edge of the filling piece 1001 abuts against the inner wall of the bottle mouth of the storage tank 1. The stand pipe 7 is inserted into the position inside the storage tank 1, and the filling cap 10 and the outer filling piece 1001 are firmly fixed in the bottle mouth of the storage tank 1, thereby increasing the stability of the stand pipe 7.

[0031] The cutting mechanism includes a magnetic cutting knife 9, which is composed of a cylindrical block and a blade. The cross-section of the cylindrical block matches the cross-section inside the vertical pipe 7. The blade is inserted between the line groove and the avoidance gap 704. The cylindrical block is filled with strong magnetism. A magnetic pulling mechanism matching the magnetic cutting knife 9 is provided on the outer wall of the plastic shell 2. The cutting knife 9 inside the vertical pipe 7 will cut an annular capsule 8 every time it advances one unit of distance downward. The cutting knife 9 is attracted by the magnetic mechanism outside the plastic shell 2, and there will be no operating gap between it and the side wall of the storage tank 1, thereby increasing the sealing of the storage tank 1.

[0032] The magnetic pulling mechanism includes a pulling guide rail 4 on the outer wall of the plastic shell 2, a pulling slider 401 is slidably installed on the pulling guide rail 4, a push-pull rod 403 is provided on the outer wall of the pulling slider 401, and magnet tiles 402 that attract each other with the cylindrical block are provided on both sides of the pulling slider 401. The pulling slider 401 is fixedly plugged in with the side wall of the pulling guide rail 4 through a pin bar. The staff manually drags the pulling slider 401 in and slides it down a unit distance. The chopping knife 9 inside the vertical pipe 7 maintains a certain relative distance through the pulling force of the magnet tile 402, and the chopping knife 9 will cut an annular capsule 8 under the magnetic pulling force.

[0033] The support leg assembly includes three rectangular shallow grooves in a circular array on the outer wall of the plastic shell 2, and support guide rods 5 are fixedly installed inside the three rectangular shallow grooves. A support slider 301 is slidably installed on the support guide rod 5, and the support slider 301 is fixedly locked by a screw valve 302 and the side wall of the support guide rod 5. A hinge block 303 is also fixedly installed on the side wall of the support slider 301, and a support leg 3 is rotatably arranged on one side of the hinge block 303. The bottom end of the support leg 3 is provided with a grounding assembly, and a limit stop bar 304 matching the support leg 3 is also provided on the side wall of the hinge block 303. A plastic buckle 501 matching the support leg 3 is provided at the bottom end of the support guide rod 5. When the storage tank 1 is erected, the staff pulls the support leg 3 out of the plastic buckle 501, and the maximum opening angle of the support leg 3 fits on the limit stop bar 304. The support slider 301 and the support leg 3 are pushed downward along the support guide rod until the bottom end of the support leg 3 touches the ground.

[0034] The grounding component includes a steel ball at the end of the supporting leg 3, a threaded short rod is arranged on the steel ball, and a threaded opening matching the threaded short rod is arranged at the bottom end of the supporting leg 3. When the depth of the steel ball at the end of the supporting leg 3 sunk into the soil is less than the radius of the steel ball, the deeper the steel ball sunk into the soil, the larger the contact area between the steel ball and the ground will be.

[0035] The pulling assembly includes two wheel frames 6 on the outer wall of the plastic shell 2, and two rollers 601 are arranged on the outer wall of the wheel frame 6. The wheel frame 6 is fixedly connected to the outer wall of the plastic shell 2 through an assembly sheet 602. Before the storage tank 1 is laid down for transportation, the material inside the storage tank 1 is emptied. After the roller 601 contacts the ground, the support leg 3 on the side wall of the storage tank 1 facing away from the wheel frame 6 can act as a pulling rod.

[0036] A wall block 201 is arranged at the top of the plastic shell 2, and the outline of the wall block 201 is L-shaped. A rubber pad is arranged on the outer wall of the wall block 201. When the storage tank 1 is stored upright, the wall block 201 can fit tightly against the wall to increase the stability of storage.

[0037] Working principle: the five sets of plastic bags on the outside of the standpipe 7 are put into the annular capsule 8, and the standpipe 7 is inserted into the storage tank 1 filled with sulfuric acid solution. The bolt head 701 at the bottom of the standpipe 7 is aligned with the threaded opening at the bottom of the storage tank 1 and inserted. The standpipe 7 and the annular capsule 8 mounted on the outside can be located at the center of the storage tank 1. The cutter mechanism slides down a unit distance, and the cutter mechanism inside the standpipe 7 will cut an annular capsule 8. After the annular capsule 8 is cut, the metal zinc particles will be released to reach the sulfuric acid solution to generate hydrogen. The hydrogen inside the storage tank 1 will be released from the outlet valve body 101 to a certain extent. After the amount is collected, the metal zinc particles inside the next annular capsule 8 are cut. Compared with the existing method of storing hydrogen, the previous hydrogen storage tank directly compresses hydrogen into liquid. The pressure of this storage method is very high. If the hydrogen storage tank is easily broken and leaked after being hit, the present invention can reduce the pressure inside the storage tank 1. The standpipe 7 is inserted into the position inside the storage tank 1. The filling cap 10 and the outer filling sheet 1001 are firmly fixed in the bottle mouth of the storage tank 1, which increases the stability of the standpipe 7. The chopping knife 9 inside the standpipe 7 will cut a unit of distance when it moves downward. An annular bag 8 is formed, and the chopping knife 9 is attracted by the magnetic mechanism on the outside of the plastic shell 2, so there will be no operating gap between it and the side wall of the storage tank 1, which increases the sealing of the storage tank 1. The staff manually drags the pulling slider 401 and slides down a unit distance. The chopping knife 9 inside the vertical pipe 7 maintains a certain relative distance through the pulling force of the magnet tile 402. The chopping knife 9 will cut an annular bag 8 under the magnetic pulling force. When the storage tank 1 is erected, the staff pulls the supporting leg 3 out of the plastic buckle 501, and the maximum opening angle of the supporting leg 3 fits in On the limiting bar 304, the supporting slider 301 and the supporting leg 3 are pushed downward along the supporting guide rod until the bottom end of the supporting leg 3 touches the ground. When the depth of the steel ball at the end of the supporting leg 3 embedded in the soil is less than the radius of the steel ball, the deeper the steel ball is embedded in the soil, the larger the contact area between the steel ball and the ground will be. Before the storage tank 1 is laid down for transportation, the material inside the storage tank 1 is emptied. After the roller 601 touches the ground, the supporting leg 3 on the side wall of the storage tank 1 facing away from the wheel frame 6 can act as a pulling rod. When the storage tank 1 is stored upright, the wall block 201 can fit closely to the wall to increase the stability of storage.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. An explosion-proof hydrogen storage device with early warning detection function, characterized in that: It comprises a storage tank (1) and a plastic shell (2), wherein the storage tank (1) and the plastic shell (2) are fixedly connected by countersunk bolts, and a gas outlet valve body (101) is provided at the top opening of the storage tank (1); A supporting leg assembly and a pulling assembly are arranged on the outer side of the plastic shell (2); A hydrogen generation component is arranged inside the storage tank (1); The hydrogen generation assembly comprises a standpipe (7) inside a storage tank (1), a bolt head (701) is arranged at the bottom end of the standpipe (7), a threaded opening matching the bolt head (701) is arranged at the bottom of the storage tank (1), a polytetrafluoroethylene coating is arranged on the inner side walls of the storage tank (1) and the threaded opening, and a sulfuric acid solution is poured into the bottom of the storage tank (1), and the sulfuric acid solution accounts for one fifth of the internal volume of the storage tank (1); The top end of the standpipe (7) is provided with a stabilizing mechanism; The top of the vertical pipe (7) is provided with five groups of plastic pockets in a straight line array, the plastic pockets include a bearing tile (702) and a plastic spring sheet (703), a cutting line groove (705) is provided on the side wall of the vertical pipe (7), the bearing tile (702) is provided with an avoidance notch (704) that is mutually connected with the cutting line groove (705), and a cutting mechanism is provided inside the vertical pipe (7); An annular capsule (8) is arranged between the bearing pad (702) and the plastic spring sheet (703), the outside of the annular capsule (8) is a rubber capsule, and the inside of the annular capsule (8) is wrapped with metal zinc particles.

2. An explosion-proof hydrogen storage device with early warning detection function according to claim 1, characterized in that: The stabilizing mechanism comprises a filling cap (10) at the end of the standpipe (7), a plurality of filling sheets (1001) in a circular array are arranged on the outer side wall of the filling cap (10), and the outer edges of the filling sheets (1001) abut against the inner side wall of the bottle mouth of the storage tank (1).

3. The explosion-proof hydrogen storage device with early warning detection function according to claim 1 is characterized in that: The cutting mechanism comprises a magnetic cutting knife (9), which is composed of a cylindrical block and a blade. The cross section of the cylindrical block matches the cross section inside the vertical pipe (7). The blade is inserted between the line slot and the avoidance notch (704). Strong magnetism is charged into the cylindrical block. A magnetic pulling mechanism matching the magnetic cutting knife (9) is arranged on the outer wall of the plastic shell (2).

4. The explosion-proof hydrogen storage device with early warning detection function according to claim 3 is characterized in that: The magnetic pulling mechanism comprises a pulling guide rail (4) on the outer wall of the plastic shell (2), a pulling slider (401) is slidably mounted on the pulling guide rail (4), a push-pull rod (403) is arranged on the outer wall of the pulling slider (401), and magnet tiles (402) that attract the cylindrical block are arranged on both sides of the pulling slider (401), and the pulling slider (401) is fixedly plugged into the side wall of the pulling guide rail (4) through a pin bar.

5. The explosion-proof hydrogen storage device with early warning detection function according to claim 1 is characterized in that: The support leg assembly comprises three rectangular shallow grooves in an annular array on the outer wall of the plastic shell (2), a support guide rod (5) is fixedly installed inside the three rectangular shallow grooves, a support slider (301) is slidably installed on the support guide rod (5), the support slider (301) is fixedly locked by a screw valve (302) and the side wall of the support guide rod (5), a hinge block (303) is also fixedly installed on the side wall of the support slider (301), a support leg (3) is rotatably arranged on one side of the hinge block (303), a grounding assembly is arranged at the bottom end of the support leg (3), a limit stop bar (304) matching the support leg (3) is also arranged on the side wall of the hinge block (303), and a plastic buckle (501) matching the support leg (3) is arranged at the bottom end of the support guide rod (5).

6. The explosion-proof hydrogen storage device with early warning detection function according to claim 5 is characterized in that: The grounding assembly comprises a steel ball at the end of a supporting leg (3), a threaded short rod is arranged on the steel ball, and a threaded opening matching the threaded short rod is arranged at the bottom end of the supporting leg (3).

7. The explosion-proof hydrogen storage device with early warning detection function according to claim 1 is characterized in that: The pulling assembly comprises two wheel frames (6) on the outer side wall of the plastic shell (2), two rollers (601) are arranged on the outer side wall of the wheel frame (6), and the wheel frame (6) is fixedly connected to the outer side wall of the plastic shell (2) via an assembly sheet (602).

8. The explosion-proof hydrogen storage device with early warning detection function according to claim 1 is characterized in that: A wall-leaning block (201) is arranged at the top end of the plastic shell (2); the outline of the wall-leaning block (201) is L-shaped; and a rubber pad is arranged on the outer side wall of the wall-leaning block (201).

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