CN108009446B

CN108009446B - Computer automation control system protection device

Info

Publication number: CN108009446B
Application number: CN201710989865.9A
Authority: CN
Inventors: 孙笛
Original assignee: Shaoguan Cloud Valley Software Co ltd
Current assignee: Shaoguan cloud valley software Co.,Ltd.
Priority date: 2017-10-23
Filing date: 2017-10-23
Publication date: 2021-01-26
Anticipated expiration: 2037-10-23
Also published as: CN108009446A

Abstract

The invention discloses a protection device for an automatic control system of a computer, which comprises an automatic control system computer, wherein a bottom plate is installed at the bottom end of the automatic control system computer, supporting legs are installed on the left side and the right side of the bottom end of the bottom plate, the inner side of a first spring is connected with the center of the outer side of the automatic control system computer, a loop bar is connected with a first buckling block through a first convex bar at the bottom of the inner side, a top plate is installed at the top end of the first buckling block, and a handle is installed at the center of the top end of the top plate. Through curb plate and fixing device's cooperation, the top of curb plate is fixed through fixing device, and the loop bar drives first nose bar and first knot piece through rotating and carries out the lock and consolidate and be connected, can fix the curb plate through fixing device, and the curb plate can protect automatic control system computer, and the surface of curb plate is covered with the cavity simultaneously and can make inside ventilation, can dispel the heat to inside simultaneously.

Description

Computer automation control system protection device

Technical Field

The invention relates to the technical field of computers, in particular to a protection device for a computer automation control system.

Background

At present, due to the convenience brought by an automatic control system, the automatic control system is used in most industrialized production, but on one hand, some existing control systems cannot make humanized typesetting on a display screen according to the requirements of users; on the other hand, due to the existence of the buttons, the layout size of the display screen is limited to a great extent, so that much key information cannot be displayed due to the too small layout, and meanwhile, the system cannot be corrected after an error occurs, and in the prior art, for example, the invention patent with the application number of 201520919421.4, comprises a touch operation screen, a monitoring system, a feedback system, a control system and a correction system, the input port of the control system is connected with the touch operation screen, the output port of the control system is connected with the correction system, the feedback system is connected with the touch operation screen in a wireless mode, the monitoring system is respectively connected with the feedback system and the touch operation screen, although the patent can make timely error modification, the computer of the general automatic control system lacks protection, and can be touched in work, and in severe cases, the computer can be damaged to influence the work.

Disclosure of Invention

The present invention is directed to a concrete mixer for building construction to solve the problems of the background art.

In order to achieve the purpose, the invention provides the following technical scheme: a protection device of a computer automatic control system comprises an automatic control system computer, wherein a bottom plate is installed at the bottom end of the automatic control system computer, supporting legs are installed on the left side and the right side of the bottom end of the bottom plate, second buckling blocks are installed at the left end and the right end of the top of the bottom plate, a side plate is sleeved on the inner wall of each second buckling block, a third supporting rod is sleeved at the bottom of each side plate and penetrates through the corresponding second buckling block and the corresponding side plate respectively, a third buckling block is installed on the inner side of each third supporting rod, a second spring is installed at the center of the bottom end of each third buckling block, the bottom end of each second spring is connected with the outer side of the bottom plate through a spring box, a first stop block is installed at the center of each side plate, the side plates are connected with the first springs through the first stop blocks, the inner sides of the first springs are connected with the center of the outer sides of the automatic, the utility model discloses a handle of roof, curb plate, fixing device, first spring, first dog, first buckle piece, first spring runs through curb plate center department through first dog, the outside center department of first dog installs the second branch, the outer wall of second branch has all cup jointed the second dog, fixing device is installed on the top of curb plate, fixing device includes first buckle piece, the top of curb plate runs through first buckle piece, first branch has been cup jointed at the top of curb plate, first branch runs through first buckle piece and curb plate respectively, first bull stick is all installed to the left and right sides of first branch, the loop bar has been cup jointed to the outer wall of first bull stick, the loop bar links to each other with first buckle piece through the first protruding pole of inboard bottom, the roof is installed on the top of first buckle piece, the handle is installed to the top center department of roof.

Preferably, the tool box is installed on the left of the top of roof, the second bull stick is installed on the left of the top of tool box, the top cap has been cup jointed to the inside of second bull stick, the inner wall center department of tool box installs the inner panel, both ends link to each other with the tool box through the second nose bar about the inner panel, the third spring is all installed to the bottom left and right sides of inner panel, the outside and the tool box of third spring link to each other.

Preferably, a first support rod is installed between the inner sides of the support legs.

Preferably, a second support rod is arranged between the bottom end of the spring box and the support leg.

Preferably, the bottom end of the supporting leg is provided with a first gasket.

Preferably, a second gasket is arranged at the intersection of the third supporting rod and the third buckle block.

Preferably, a third gasket is arranged at the intersection of the side plate and the first buckle block.

Preferably, a fourth gasket is arranged at the intersection of the first convex rod and the first buckle block.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention discloses a method for supporting a bottom plate by supporting the bottom plate by supporting legs, wherein an automatic control system computer is fixed on the bottom plate, the automatic control system is a control system which can enable a production process or other processes to be carried out according to an expected rule or a preset program without direct participation of people, the automatic control system is a main means for realizing automation, the automatic control system computer is called an automatic control system for short, a convex part on the surface of the bottom plate clamps the automatic control system computer to prevent the automatic control system computer from shaking, the bottom plate is supported by the supporting legs, the bottom plate can be supported by the supporting legs, holes are distributed on the surface of the bottom plate to dissipate heat, and the inside of the bottom plate can dissipate heat through the bottom plate by the supporting legs.

2. The invention discloses a novel automatic control system, which is characterized in that a side plate is matched with a first spring, the center of the side plate is fixed by the first spring, the side plate is fixed on an automatic control system computer by the first spring, the first spring is fixed by a first stop block, the first spring is a compression spring, the compression spring is also called a compression spring and is a spiral spring bearing pressure, the section of the material used by the automatic control system computer is mostly circular, the automatic control system is also coiled by rectangular and multi-strand steel beams, the spring is generally at equal pitch, and the shape of the compression spring is as follows: cylindrical, conical, well convex and well spill and a small amount of non-circular etc, there is certain clearance between compression spring's circle and the circle, spring shrinkage deformation when receiving external load, store deformability, can outwards push away the curb plate when the curb plate takes place to scrape through the characteristic of first spring, second branch runs through the fixed first dog of curb plate, the second dog cup joints and fixes at second branch outer wall, can fix the central part of curb plate through first spring, prevent to drop.

3. According to the invention, the bottom of the side plate is fixed through the second buckling block through the matching of the side plate and the second buckling block, the side plate penetrates through the second buckling block for fixing, the third supporting rod penetrates through the second buckling block and the side plate for reinforcing connection, the third supporting rod and the third buckling block are buckled for fixing, the convex parts of the third buckling block and the third supporting rod are buckled for preventing falling, and the side plate can be fixed on the surface of the bottom plate through the second buckling block for preventing falling.

4. The invention relates to a method for fixing a spring in a spring box, which comprises the steps of connecting a third fastening block and a second spring in a reinforcing connection through the cooperation of the third fastening block and the second spring, wherein the second spring is an extension spring, the working principle of the extension spring is opposite to that of a compression spring, the compression spring is opposite to that of the extension spring, the extension spring is opposite to that of the extension spring when being compressed, the extension spring is opposite to that of the extension spring when being extended or extended, when two ends of the extension spring are extended, the spring tries to pull the extension spring back together, like the compression spring, the extension spring also absorbs and stores energy, but unlike the compression spring, most extension springs are usually under certain tension even under no load, the initial tension determines the tightness of the winding of the extension spring under no load, the third fastening block can be tightly pulled through the characteristic of the second spring, and the second spring is fixed in the spring box, the spring box can fix the second spring on two sides of the bottom plate, and the third buckling block can be tightly fixed through the second spring, so that the connection of the third buckling block is reinforced.

5. According to the invention, through the matching of the side plate and the fixing device, the top of the side plate is fixed through the fixing device, the side plate penetrates through the interior of the first buckling block to be fixed, the first supporting rod penetrates through the first buckling block and the side plate to be connected in a reinforcing manner, the loop bar rotates through the first rotating rod fixed on the first supporting rod, the loop bar is sleeved on the outer wall of the first supporting rod to rotate, the first convex rod is driven to rotate through the loop bar, the loop bar drives the first convex rod to be buckled and connected with the first buckling block in a reinforcing manner through rotation, the side plate can be fixed through the fixing device, the side plate can protect an automatic control system computer, and meanwhile, the surface of the side plate is fully provided with holes to ventilate the interior and radiate the interior.

Drawings

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

FIG. 2 is a schematic cross-sectional view of a second fastening block of the present invention;

FIG. 3 is a schematic structural elevation view of a third bar of the present invention;

FIG. 4 is a front view of the first spring of the present invention;

FIG. 5 is a schematic cross-sectional view of a first fastener of the present invention;

fig. 6 is a schematic sectional view of the tool box of the present invention.

In the figure: 1. an automatic control system computer, 2, a side plate, 3, a bottom plate, 4, a support leg, 5, a fixing device, 501, a first buckle block, 502, a first support rod, 503, a first rotating rod, 504, a loop bar, 505, a first convex rod, 6, a first spring, 7, a first stop, 8, a second support rod, 9, a second stop, 10, a second buckle block, 11, a third support rod, 12, a third buckle block, 13, a spring box, 14, a second spring, 15, a top plate, 16, a handle, 17, a tool box, 18, a second rotating rod, 19, a top cover, 20, an inner plate, 21, a second convex rod, 22, a third spring, 23, a first support rod, 24, a second support rod, 25, a first gasket, 26, a second gasket, 27, a third gasket, 28, and a fourth gasket.

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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides a technical solution: a computer automatic control system protection device comprises an automatic control system computer 1, wherein the automatic control system is a control system which can enable the production process or other processes to be carried out according to expected rules or preset programs under the condition of no direct participation of people, the automatic control system is a main means for realizing automation, the automatic control system is called as an automatic control system for short, a bottom plate 3 is installed at the bottom end of the automatic control system computer 1, the automatic control system computer 1 is fixed on the bottom plate 3, the automatic control system computer 1 is clamped by a convex part on the surface of the bottom plate 3, supporting legs 4 are installed on the left side and the right side of the bottom end of the bottom plate 3, the supporting legs 4 are used for supporting the bottom plate 3, holes are fully distributed on the surface of the bottom plate 3 for heat dissipation, first gaskets 25 are installed at the bottom ends of the supporting legs 4, the first gaskets 25 are made of rubber, and the friction force at the bottoms of the, the supporting legs 4 can be more stably fixed on the ground, the first supporting rods 23 are arranged between the inner sides of the supporting legs 4, the first supporting rods 23 can better fix the supporting legs 4, the firmness degree between the supporting legs 4 can be increased, the second buckling blocks 10 are arranged at the left end and the right end of the top of the bottom plate 3, the bottoms of the side plates 2 are fixed by the second buckling blocks 10, the inner walls of the second buckling blocks 10 are sleeved with the side plates 2, the side plates 2 penetrate through the second buckling blocks 10, the bottoms of the side plates 2 are sleeved with the third supporting rods 11, the third supporting rods 11 respectively penetrate through the second buckling blocks 10 and the side plates 2, the inner sides of the third supporting rods 11 are provided with the third buckling blocks 12, the second gaskets 26 are arranged at the intersections of the third supporting rods 11 and the third buckling blocks 12, the second gaskets 26 are made of rubber, the rubber is a high-elasticity polymer material with reversible deformation, the elasticity is rich at room temperature, and can generate, the rubber can restore to the original shape after external force is removed, meanwhile, the rubber has a sealing function, a second spring 14 is installed at the center of the bottom end of a third buckling block 12, the bottom end of the second spring 14 is connected with the outer side of a bottom plate 3 through a spring box 13, a third supporting rod 11 penetrates through a second buckling block 10 and a side plate 2 to be fixed, the third supporting rod 11 is buckled with the third buckling block 12 to be fixed, the third buckling block 12 is connected and fixedly connected with the second spring 14, the second spring 14 is an extension spring, the working principle of the extension spring is opposite to that of a compression spring, the compression spring acts in a reverse direction when being compressed, the extension spring acts in a reverse direction when being extended or extended, when two ends of the extension spring are extended, the spring tries to pull the extension spring back together, like a compression spring, the extension spring also absorbs and stores energy, but unlike the compression spring, most extension springs are usually under a certain degree of tension, even in the absence of any load, the initial tension determines the tightness of the tension spring winding in the absence of any load, the third buckle block 12 can be tightly held by the characteristics of the second spring 14, the second spring 14 is fixed in the spring case 13, the second spring 14 can be fixed on both sides of the bottom plate 3 by the spring case 13, the second support rod 24 is installed between the bottom end of the spring case 13 and the leg 4, the second support rod 24 can better fix the spring case 13 and the leg 4, the first stopper 7 is installed at the center of the side plate 2, the side plate 2 is connected with the first spring 6 by the first stopper 7, the inner side of the first spring 6 is connected with the outer center of the automation control system computer 1, the first spring 6 penetrates the center of the side plate 2 by the first stopper 7, the first stopper 7 fixes the first spring 6, the first spring 6 is a compression spring, compression spring is also called the pressure spring and bears the helical spring to pressure, and the material cross-section that it used is mostly circular, also has rectangle and stranded steel silk to roll up, and the spring is generally the equidistance, and compression spring's shape has: the compression spring is cylindrical, conical, convex in the middle, concave in the middle, small in quantity, non-circular and the like, a certain gap is reserved between rings of the compression spring, when the compression spring is subjected to external load, the spring shrinks and deforms to store deformation energy, the side plate 2 can be pushed outwards when the side plate 2 is scraped and touched through the characteristics of the first spring 6, the automatic control system computer 1 can be protected by the side plate 2 to prevent the automatic control system computer 1 from being scratched and touched to generate faults, the second supporting rod 8 is installed at the center of the outer side of the first stopping block 7, the second stopping block 9 is sleeved on the outer wall of the second supporting rod 8, the fixing device 5 is installed at the top end of the side plate 2, the fixing device 5 comprises a first buckling block 501, the top end of the side plate 2 penetrates through the first buckling block 501, the top end of the side plate 2 is fixed by the fixing device 5, a third gasket 27 is installed at the intersection of the side plate 2 and the first buckling block 501, the third gasket 27, the top of the side plate 2 is sleeved with a first supporting rod 502, the first supporting rod 502 penetrates through the first buckle block 501 and the side plate 2 respectively, the side plate 2 penetrates through the inside of the first buckle block 501, the first supporting rod 502 penetrates through the first buckle block 501 and the side plate 2 to be fixed, the left side and the right side of the first supporting rod 502 are both provided with first rotating rods 503, the outer wall of each first rotating rod 503 is sleeved with a sleeve rod 504, the sleeve rod 504 is connected with the first buckle block 501 through a first convex rod 505 at the bottom of the inner side, the sleeve rod 504 is rotated by the first rotating rod 503 fixed on the first supporting rod 502, the sleeve rod 504 is sleeved on the outer wall of the first supporting rod 503 to be rotated, a fourth gasket 28 is arranged at the intersection of the first convex rod 505 and the first buckle block 501, the fourth gasket 28 is made of rubber, the rubber is soft in texture and can increase friction, the first convex rod 505 can be better connected with the first buckle block 501 through the fourth gasket 28, the sleeve rod 504 drives the first convex rod 505 to be connected with the first buckle block 501 in a fastening way through rotation, the top end of the first buckle block 501 is provided with a top plate 15, the top center of the top plate 15 is provided with a handle 16, the first buckle block 501 fixes the top plate 15, the top plate 15 can be taken down through the handle 16, the top plate 15 can be taken down through reversely operating the first support rod 502, the top left side of the top plate 15 is provided with a tool box 17, the tool box 17 can be internally provided with a maintenance tool for the automatic control system computer 1, the top left side of the tool box 17 is provided with a second rotating rod 18, the second rotating rod 18 is internally sleeved with a top cover 19, the top cover 19 can rotate through the second rotating rod 18, the inner wall center of the tool box 17 is provided with an inner plate 20, the surface of the inner plate 20 can be provided with tools or articles, the capacity of the tool box 17 can be increased, the left and right ends of the inner plate 20 are connected with the tool box 17 through second convex rods 21, the second convex rods 21 can hold the inner plate 20, the left and right sides of the bottom, the third spring 22 is a compression spring, the inner plate 20 can be fixed by the characteristics of the compression spring, the third spring 22 can be compressed by applying a force to one surface of the inner plate 20, the other side of the inner plate 20 can be pulled out, and the outer side of the third spring 22 is connected with the tool box 17.

When the automatic control system computer is installed, the automatic control system computer 1 is fixed on the bottom plate 3, the automatic control system computer 1 is clamped by the convex part on the surface of the bottom plate 3, the supporting legs 4 are used for supporting the bottom plate 3, the surface of the bottom plate 3 is fully distributed with holes for heat dissipation, the center of the side plate 2 is fixed by the first spring 6, the side plate 2 is fixed on the automatic control system computer 1 by the first spring 6, the first spring 6 is fixed by the first stop dog 7, the first spring 6 is a compression spring, the side plate 2 can be pushed outwards when the side plate 2 is scraped and touched by the characteristics of the first spring 6, the second supporting rod 8 penetrates through the side plate 2 to fix the first stop dog 7, the second stop dog 9 is sleeved on the outer wall of the second supporting rod 8 to be fixed, the bottom of the side plate 2 is fixed by the second buckling block 10, the side plate 2 penetrates through the second buckling block 10, the third supporting rod 11 penetrates through the second buckling block, the third pole support 11 is buckled with the third buckle block 12 for fixing, the third buckle block 12 is connected and connected with the second spring 14 in a reinforcing way, the second spring 14 is an extension spring, the third buckle block 12 can be tightly pulled by the characteristic of the second spring 14, the second spring 14 is fixed in the spring box 13, the spring box 13 can fix the second spring 14 on two sides of the bottom plate 3, the top of the side plate 2 is fixed by the fixing device 5, the side plate 2 penetrates through the inside of the first buckle block 501, the first strut 502 penetrates through the first buckle block 501 and the side plate 2 to be fixed, the loop bar 504 rotates by the first rotating rod 503 fixed on the first strut 502, the loop bar 504 is sleeved on the outer wall of the first strut 503 to rotate, the loop bar 504 drives the first protruding rod 505 to be buckled and reinforced with the first buckle block 501 by rotation, the first buckle block 501 fixes the top plate 15, the top plate 15 can be taken down by the handle 16, and the top plate 15 can be taken down by reversely operating the first strut 502.

In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A computer automation control system protection device, comprising an automation control system computer (1), characterized in that: the bottom plate (3) is installed at the bottom end of the automatic control system computer (1), the supporting legs (4) are installed on the left side and the right side of the bottom end of the bottom plate (3), the second buckling blocks (10) are installed at the left end and the right end of the top of the bottom plate (3), the side plate (2) is sleeved on the inner wall of each second buckling block (10), the third supporting rod (11) is sleeved on the bottom of the side plate (2), the third supporting rod (11) penetrates through the second buckling blocks (10) and the side plate (2) respectively, the third buckling blocks (12) are installed on the inner side of each third supporting rod (11), the second springs (14) are installed at the centers of the third buckling blocks (12), the bottom ends of the second springs (14) are connected with the outer side of the bottom plate (3) through spring boxes (13), the first stop blocks (7) are installed at the centers of the side plates (2), and the side plate (2) is connected with the first springs (6) through the first stop blocks (7, the inner side of the first spring (6) is connected with the outer side center of the automatic control system computer (1), the first spring (6) penetrates through the center of the side plate (2) through the first stop block (7), the outer side center of the first stop block (7) is provided with the second supporting rod (8), the outer wall of the second supporting rod (8) is sleeved with the second stop block (9), the top end of the side plate (2) is provided with the fixing device (5), the fixing device (5) comprises the first buckling block (501), the top end of the side plate (2) penetrates through the first buckling block (501), the top of the side plate (2) is sleeved with the first supporting rod (502), the first supporting rod (502) penetrates through the first buckling block (501) and the side plate (2) respectively, the left side and the right side of the first supporting rod (502) are both provided with the first rotating rod (503), the outer wall of the first rotating rod (503) is sleeved with the loop bar (504), the loop bar (504) is connected with a first buckle block (501) through a first convex rod (505) at the bottom of the inner side, the top plate (15) is installed at the top end of the first buckle block (501), a handle (16) is installed at the center of the top end of the top plate (15), a tool box (17) is installed on the left side of the top end of the tool box (15), a second rotating rod (18) is installed on the left side of the top end of the tool box (17), a top cover (19) is sleeved inside the second rotating rod (18), an inner plate (20) is installed at the center of the inner wall of the tool box (17), the left end and the right end of the inner plate (20) are connected with the tool box (17) through a second convex rod (21), third springs (22) are installed on the left side and the right side of the bottom end of the inner plate (20), the outer side of each third spring (22) is connected with the tool box (17), and a first supporting rod (23) is installed between the, all install second bracing piece (24) between the bottom of spring box (13) and landing leg (4), first gasket (25) are installed to the bottom of landing leg (4), second gasket (26) are installed to the crossing department of third branch (11) and third knot piece (12), third gasket (27) are installed to the crossing department of curb plate (2) and first knot piece (501), fourth gasket (28) are installed to crossing department of first nose bar (505) and first knot piece (501).

2. A computer automation control system protection method is characterized in that: an automatic control system computer 1 is fixed on a bottom plate 3, the automatic control system computer 1 is clamped by a convex part on the surface of the bottom plate 3, a supporting leg 4 is used for supporting the bottom plate 3, holes are distributed on the surface of the bottom plate 3 for heat dissipation, the center of a side plate 2 is fixed by a first spring 6, the side plate 2 is fixed on the automatic control system computer 1 by the first spring 6, the first spring 6 is fixed by a first stop dog 7, the first spring 6 is a compression spring, the side plate 2 can be pushed outwards when the side plate 2 is scraped and touched by the characteristics of the first spring 6, a second supporting rod 8 penetrates through the side plate 2 to fix the first stop dog 7, a second stop dog 9 is sleeved on the outer wall of the second supporting rod 8 to fix, the bottom of the side plate 2 is fixed by a second buckling block 10, the side plate 2 penetrates through the second buckling block 10, a third supporting rod 11 penetrates through the second buckling block 10 and the side plate 2 to fix, and the third supporting rod 11 is buckled with a third buckling block 12, the third buckle block 12 and the second spring 14 are connected and fixedly connected, the second spring 14 is an extension spring, the third buckle block 12 can be tightly pulled by the characteristics of the second spring 14, the second spring 14 is fixed in the spring box 13, the second spring 14 can be fixed on two sides of the bottom plate 3 by the spring box 13, the top of the side plate 2 is fixed by the fixing device 5, the side plate 2 penetrates through the inside of the first buckle block 501, the first support rod 502 penetrates through the first buckle block 501 and the side plate 2 to be fixed, the loop bar 504 is rotated by the first rotating rod 503 fixed on the first support rod 502, the loop bar 504 is sleeved on the outer wall of the first support rod 503 to be rotated, the loop bar 504 drives the first convex rod 505 to be buckled and fixedly connected with the first buckle block 501 through rotation, the top plate 15 is fixed by the first buckle block 501, the top plate 15 can be taken down by the handle 16, and the top plate 15 can be taken down by reversely operating the first support rod 502.