Fireproof goods shelf

Abstract

The invention relates to the technical field of storage equipment, and discloses a fireproof goods shelf which comprises a shelf body, laminates, a fireproof component, a monitoring assembly and a control assembly. The layer plates are connected to the frame body, the thickness of the layer plates extends in the height direction, and the layer plates are used for bearing goods. The fireproof component is arranged above the laminate in the height direction; the monitoring assembly is used for monitoring whether goods are on fire or not and electrically connected with the control assembly. Wherein the fireproof part is connected with the control assembly, the control assembly is configured to enable the fireproof part to move downwards based on a signal of the monitoring assembly so that the fireproof part can cover the goods, the fireproof goods shelf has a fireproof function, the fireproof goods shelf is used for storing the goods, and fire spreading can be effectively controlled when the goods are on fire.

Description

Technical Field

[0001] The invention relates to the technical field of storage equipment, in particular to a fireproof shelf. Background Art

[0002] At present, common shelves are mainly used to store ordinary goods. Their design does not fully consider the special safety needs of lithium batteries and lacks effective fire prevention measures. When lithium batteries experience thermal runaway or catch fire on the shelves, ordinary shelves cannot effectively block and control the fire. The fire will quickly spread to the lithium batteries on the surrounding shelves, forming a chain reaction, leading to larger-scale fire accidents, causing serious property losses, and posing a huge threat to people's lives. Summary of the invention

[0003] The primary purpose of the present invention is to provide a fireproof shelf, which is used to store goods and can effectively control the spread of fire when the goods catch fire.

[0004] In order to achieve the above-mentioned object, the present invention provides a fireproof shelf, including a frame body, a layer board, a fireproof component, a monitoring component and a control component;

[0005] The layer plate is connected to the frame, the thickness of the layer plate extends along the height direction, and the layer plate is used to carry goods;

[0006] The fireproof component is arranged above the layer board along the height direction;

[0007] The monitoring component is used to monitor whether the cargo is on fire, and the monitoring component is electrically connected to the control component;

[0008] Wherein, the fireproof component is connected to the control component, and the control component is configured to move the fireproof component downward based on the signal of the monitoring component so that the fireproof component covers the goods.

[0009] In a specific embodiment of the present invention, there are multiple layer plates, and the multiple layer plates are spaced apart along the height direction, and the fireproof component and the monitoring component are provided between two adjacent layer plates;

[0010] Among them, among the two adjacent layer boards, the layer board located on the upper side along the height direction is the first layer board, the monitoring component is connected to the bottom side of the first layer board, and the fireproof component is located on the side of the monitoring component away from the first layer board.

[0011] In a specific embodiment of the present invention, the monitoring component includes a hydrogen sensor and a carbon monoxide sensor, the hydrogen sensor and the carbon monoxide sensor are connected at intervals on the bottom side of the first layer board, and the hydrogen sensor and the carbon monoxide sensor are electrically connected to the control component.

[0012] In a specific embodiment of the present invention, the control assembly includes an electric control box and a first electromagnet component, the first electromagnet component includes a first electromagnetic male seat and a first electromagnetic female seat, the first electromagnetic female seat is electrically connected to the electric control box, and the monitoring assembly is electrically connected to the electric control box;

[0013] A plurality of the first electromagnet components are provided between two adjacent layers, wherein a plurality of the first electromagnetic male seats are connected to the edge of the fireproof component at intervals, a plurality of the first electromagnetic female seats are connected to the bottom side surface of the first layer, and each of the first electromagnetic male seats is detachably connected to one of the first electromagnetic female seats.

[0014] In a specific embodiment of the present invention, the control assembly further comprises a second electromagnet component, the second electromagnet component comprises a second electromagnetic male seat and a second electromagnetic female seat, and the second electromagnetic female seat is electrically connected to the electric control box;

[0015] The second electromagnet component is provided between two adjacent layers, wherein the second electromagnetic male seat is connected to the middle part of the fireproof component, the second electromagnetic female seat is connected to the bottom side of the first layer, and the second electromagnetic male seat and the second electromagnetic female seat are detachably connected.

[0016] In a specific embodiment of the present invention, the fireproof shelf further comprises a guide assembly, the guide assembly comprises a guide rod and a slider, the length of the guide rod extends along the height direction, and the slider is slidably connected to the guide rod;

[0017] A plurality of guide assemblies are provided between two adjacent layer plates, and each of the first electromagnetic suction male seats is connected to a guide assembly, wherein the first electromagnetic suction male seat is connected to the slider, and the guide rod is connected to the frame.

[0018] In a specific embodiment of the present invention, the control component further comprises an uninterruptible power supply, and the uninterruptible power supply is electrically connected to the electric control box.

[0019] In a specific embodiment of the present invention, the fireproof shelf further comprises a counterweight, and the counterweight is connected to the edge of the fireproof component.

[0020] In a specific embodiment of the present invention, the counterweight is ring-shaped, arranged around the center of the fireproof component, and located on the top side of the fireproof component.

[0021] In a specific embodiment of the present invention, the frame is provided with a plurality of buckle holes;

[0022] The layer plate includes a plate body and a buckle body, the thickness of the plate body extends along the height direction, and the plate body is used to carry the goods; the number of the buckle bodies is multiple, and the multiple buckle bodies are connected to the plate body;

[0023] Wherein, each of the button holes can be detachably clamped with a button body, the button body is plate-shaped, and the button body is inclined from top to bottom toward the button hole.

[0024] Compared with the prior art, the fireproof shelf of the embodiment of the present invention has the following beneficial effects:

[0025] In actual application, the fireproof shelf of the present invention has goods placed on the shelf. If the monitoring component detects that the goods are on fire, the monitoring component will transmit a signal to the control component. Based on the signal, the control component moves the fireproof component downward to cover the goods, which can effectively block the contact between air and goods, thereby suppressing the spread of fire and extinguishing the combustion quickly due to lack of oxygen. That is, the fireproof shelf of the present invention has a fireproof function. When the fireproof shelf is used to store goods, the spread of fire can be effectively controlled when the goods catch fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a three-dimensional diagram of a fireproof shelf according to an embodiment of the present invention;

[0027] Figure 2 Embodiment of the present invention Figure 1 A is an enlarged schematic diagram;

[0028] Figure 3 This is a front view of a fireproof shelf according to an embodiment of the present invention;

[0029] Figure 4 is a side view of a fireproof shelf according to an embodiment of the present invention;

[0030] Figure 5 Embodiment of the present invention Figure 4 A magnified schematic diagram of B;

[0031] Figure 6 This is a structural diagram of a fireproof shelf when the fireproof components are covered on the goods according to an embodiment of the present invention;

[0032] Figure 7 It is a structural diagram of the cooperation between the layer plate and the fireproof component when the fireproof component covers the goods according to an embodiment of the present invention.

[0033] In the figure, Z, height direction; 100, cargo; 1, frame; 101, buckle hole; 2, layer board; 2A, first layer board; 21, plate body; 22, buckle body; 3, fireproof component; 4, monitoring component; 41, hydrogen sensor; 42, carbon monoxide sensor; 5, control component; 51, electric control box; 52, first electromagnet component; 521, first electromagnetic suction male socket; 522, first electromagnetic suction female socket; 53, second electromagnet component; 531, second electromagnetic suction male socket; 532, second electromagnetic suction female socket; 54, uninterruptible power supply; 6, guide component; 61, guide rod; 62, slider; 7, counterweight. DETAILED DESCRIPTION

[0034] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] like Figures 1 to 5 As shown, a fireproof shelf of a preferred embodiment of the present invention includes a frame 1, a shelf 2, a fireproof component 3, a monitoring component 4 and a control component 5; the shelf 2 is connected to the frame 1, the thickness of the shelf 2 extends along the height direction Z, and the shelf 2 is used to carry goods 100; the fireproof component 3 is arranged above the shelf 2 along the height direction Z; the monitoring component 4 is used to monitor whether the goods 100 are on fire, and the monitoring component 4 is electrically connected to the control component 5; wherein, the fireproof component 3 is connected to the control component 5, and the control component 5 is configured to move the fireproof component 3 downward based on the signal of the monitoring component 4, so that the fireproof component 3 covers the goods 100.

[0039] In actual application, the goods 100 are placed on the shelf 2. If the monitoring component 4 detects that the goods 100 are on fire, the monitoring component 4 will transmit a signal to the control component 5. The control component 5 moves the fireproof component 3 downward based on the signal so that the fireproof component 3 covers the goods 100. At this time, the structure of the fireproof shelf is as follows: Figure 6 As shown, the contact between air and goods 100 can be effectively blocked, thereby suppressing the spread of fire and extinguishing the combustion quickly due to lack of oxygen. That is, the fireproof shelf of the present invention has a fireproof function. When the goods 100 are stored on the fireproof shelf, the spread of fire can be effectively controlled when the goods 100 catch fire.

[0040] The above-mentioned goods 100 can be lithium batteries, etc., and the fireproof component 3 can be a fireproof blanket or fireproof cloth, which is not limited in this application.

[0041] like Figure 4 and Figure 5As shown, there are multiple layers 2, and the multiple layers 2 are spaced apart along the height direction Z, and fireproof components 3 and monitoring components 4 are provided between two adjacent layers 2; wherein, among the two adjacent layers 2, the layer 2 located at the upper side along the height direction Z is the first layer 2A, and the monitoring component 4 is connected to the bottom side of the first layer 2A, and the fireproof component 3 is located on the side of the monitoring component 4 away from the first layer 2A, at this time, the fireproof component 3 is used to cover the goods 100 on the layer 2 located below it, specifically, there are multiple layers 2, and at this time, the layer 2 located below the two adjacent layers 2 is used to carry the goods 100, thereby, the fireproof shelf can store more goods 100, and the fireproof shelf has the advantage of a large storage capacity; and the monitoring component 4 is arranged on the bottom side of the first layer 2A, which can quickly monitor whether the goods 100 located below it are on fire, thereby, being able to quickly curb the spread of the fire.

[0042] like Figure 5 As shown, the monitoring component 4 includes a hydrogen sensor 41 and a carbon monoxide sensor 42, which are spaced apart and connected to the bottom side of the first layer 2A, and the hydrogen sensor 41 and the carbon monoxide sensor 42 are both electrically connected to the control component 5. Specifically, the monitoring component 4 monitors whether the cargo 100 is on fire through the hydrogen sensor 41 and the carbon monoxide sensor 42, and has high sensitivity and high fault tolerance, and does not need to contact the cargo 100, and is easy to install. For example, the cargo 100 is a lithium battery, and the fireproof component 3 is a fireproof blanket. The lithium battery will During the thermal runaway process, some specific gases such as hydrogen and carbon monoxide will be released first. The gases will pass through the fire blanket and be detected by the hydrogen sensor 41 and / or the carbon monoxide sensor 42. At this time, the hydrogen sensor 41 and the carbon monoxide sensor 42 will generate a signal and transmit the signal to the control component 5, which will then trigger the fireproof component 3 to cover the lithium battery. Based on this, the hydrogen sensor 41 and the carbon monoxide sensor 42 are used to monitor whether the lithium battery is on fire. The advantage is that the fireproof component 3 is triggered to cover the lithium battery before an open flame appears in the lithium battery, so that fire prevention is timely.

[0043] In other embodiments, the monitoring component 4 may also be a temperature sensor or a smoke sensor, which is not limited in the present application.

[0044] like Figure 2As shown, the control component 5 includes an electric control box 51 and a first electromagnet component 52, the first electromagnet component 52 includes a first electromagnetic male seat 521 and a first electromagnetic female seat 522, the first electromagnetic female seat 522 is electrically connected to the electric control box 51, and the hydrogen sensor 41 and the carbon monoxide sensor 42 of the monitoring component 4 are electrically connected to the electric control box 51; a plurality of first electromagnet components 52 are arranged between two adjacent layer plates 2, wherein a plurality of first electromagnetic male seats 521 are connected to the edge of the fireproof component 3 at intervals, a plurality of first electromagnetic female seats 522 are connected to the bottom side of the first layer plate 2A, and each first electromagnetic male seat 521 is detachably connected to a first electromagnetic female seat 522; specifically, the first electromagnetic female seat 522 generates magnetic force when electricity is supplied to it, and the first electromagnetic female seat 522 is magnetically connected to the first electromagnetic male seat 521, when the first When the electromagnetic suction mother seat 522 is powered off, the magnetic force it generates disappears, and thus, the first electromagnetic suction mother seat 521 will separate from the first electromagnetic suction mother seat 522 due to the action of gravity and move downward, thereby driving the fireproof component 3 to fall to cover the goods 100. Based on this process, in actual application, the first electromagnetic suction mother seat 522 is initially in a powered state to be connected to the first electromagnetic suction mother seat 521, and when the hydrogen sensor 41 and the carbon monoxide sensor 42 detect that the goods 100 are on fire, the two generate signals and transmit the signals to the electrical control box 51. The electrical control box 51 controls the first electromagnetic suction mother seat 522 to be powered off based on the signal, so that the first electromagnetic suction mother seat 521 drives the fireproof component 3 to fall to cover the goods 100, that is, the fireproof shelf uses the method of turning on and off the power of the electromagnet to make the fireproof component 3 cover the goods 100, which has a simple structure and is easy to control.

[0045] Since the fireproof component 3 is a fireproof cloth or a fireproof blanket, in order to ensure that the fireproof component 3 can cover the goods 100, in actual application, the area of ​​the fireproof component 3 needs to be set larger. For example, the area of ​​the fireproof component 3 is larger than the area of ​​the side of the layer 2 that carries the goods 100, thereby ensuring that the fireproof component 3 can smoothly cover the goods 100. However, it is difficult to avoid sagging in the middle of a large-area fireproof component 3, which affects the operator's operation of storing and retrieving the goods 100. In the present application, Figure 5As shown, the control assembly 5 also includes a second electromagnet component 53, and the second electromagnet component 53 includes a second electromagnetic suction male seat 531 and a second electromagnetic suction female seat 532, and the second electromagnetic suction female seat 532 is electrically connected to the electric control box 51; a second electromagnet component 53 is provided between two adjacent layer boards 2, wherein the second electromagnetic suction male seat 531 is connected to the middle part of the fireproof component 3, and the second electromagnetic suction female seat 532 is connected to the bottom side of the first layer board 2A, and the second electromagnetic suction male seat 531 and the second electromagnetic suction female seat 532 are detachably connected, thereby, the fireproof component The middle part of the fireproof component 3 is connected to the first layer 2A by the second electromagnet component 53, the middle part of the fireproof component 3 will not sag, and the fireproof component 3 will not affect the operator's operation of storing and retrieving the goods 100; similarly, the second electromagnetic suction nut 532 is connected to the second electromagnetic suction nut 531 when powered on, and is separated from the second electromagnetic suction nut 532 when powered off. When the goods 100 catch fire, the electric control box 51 cuts off the power to the first electromagnetic suction nut 522 and the second electromagnetic suction nut 532 at the same time based on the signal of the monitoring component 4 to ensure that the fireproof component 3 can fall smoothly to cover the goods 100.

[0046] like Figure 1 and Figure 2 As shown, the fireproof shelf also includes a guide assembly 6, which includes a guide rod 61 and a slider 62. The length of the guide rod 61 extends along the height direction Z, and the slider 62 is slidably connected to the guide rod 61; a plurality of guide assemblies 6 are provided between two adjacent layer boards 2, and each first electromagnetic suction male seat 521 is connected to a guide assembly 6, wherein the first electromagnetic suction male seat 521 is connected to the slider 62, and the guide rod 61 is connected to the frame 1. The setting of the guide rod 61 and the slider 62 can ensure that the first electromagnetic suction male seat 521 can stably move along the height direction Z, thereby ensuring that the fireproof component 3 can smoothly cover the goods 100.

[0047] like Figure 3 As shown, the control component 5 also includes an uninterruptible power supply 54, which is electrically connected to the electric control box 51. The uninterruptible power supply 54 is a constant voltage and frequency uninterruptible power supply 54 containing an energy storage device and an inverter as a main component. It can provide continuous power supply to the electric control box 51 when the city power is interrupted, thereby preventing the fire protection component 3 from mistakenly triggering downward movement due to an accidental power outage.

[0048] In this embodiment, the fireproof shelf also includes a counterweight 7, which is connected to the edge of the fireproof component 3. Therefore, after the fireproof component 3 covers the goods 100, the counterweight 7 can press the edge of the fireproof component 3 against the shelf 2, thereby achieving a good covering effect and reducing the risk of open flames jumping out of the gap between the fireproof component 3 and the shelf 2.

[0049] Preferably, Figure 7As shown, the counterweight 7 is ring-shaped, and is arranged around the center of the fireproof component 3, and the counterweight 7 is located on the top side of the fireproof component 3. Therefore, the fireproof component 3 has a better covering effect on the cargo 100 and can prevent open flames from jumping out.

[0050] like Figure 2 As shown, the frame 1 is provided with a plurality of buckle holes 101; the layer plate 2 includes a plate body 21 and a buckle body 22, the thickness of the plate body 21 extends along the height direction Z, and the plate body 21 is used to carry goods 100; the number of buckle bodies 22 is multiple, and the multiple buckle bodies 22 are connected to the plate body 21; wherein each buckle hole 101 can be detachably clamped with a buckle body 22, the buckle body 22 is plate-shaped, and the buckle body 22 is inclined from top to bottom toward the buckle hole 101, and the buckle body 22 of this structure has the advantage that it not only ensures the stable connection between the layer plate 2 and the frame 1, but also facilitates the separation of the layer plate 2 from the frame 1; in actual application, when the goods 100 on the layer plate 2 catches fire, the layer plate 2 can be lifted upward by equipment such as a forklift to remove the layer plate 2 together with the fireproof component 3 from the frame 1, so as to facilitate the fire extinguishing work, and the structure after the layer plate 2 together with the fireproof component 3 are removed from the frame 1 is as shown Figure 7 shown.

[0051] In this embodiment, the control component 5 may also include an alarm, which is electrically connected to the electrical control box 51. After receiving the signal that the cargo 100 is on fire, the electrical control box 51 controls the alarm to operate so as to serve as a prompt, so that the staff can quickly locate the fire location; wherein the alarm can be at least one of a horn and a flashing light, and this application does not impose any restrictions on this.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A fireproof shelf, characterized in that: It comprises a frame (1), a layer board (2), a fireproof component (3), a monitoring component (4) and a control component (5); The layer plate (2) is connected to the frame (1), the thickness of the layer plate (2) extends along the height direction (Z), and the layer plate (2) is used to carry goods (100); The fireproof component (3) is arranged above the layer board (2) along the height direction (Z); The monitoring component (4) is used to monitor whether the cargo (100) is on fire, and the monitoring component (4) is electrically connected to the control component (5); The fireproof component (3) is connected to the control component (5), and the control component (5) is configured to move the fireproof component (3) downward based on the signal of the monitoring component (4) so ​​that the fireproof component (3) covers the cargo (100).

2. The fireproof shelf according to claim 1, characterized in that: There are a plurality of layer plates (2), and the plurality of layer plates (2) are arranged at intervals along the height direction (Z), and the fireproof component (3) and the monitoring component (4) are provided between two adjacent layer plates (2); Among the two adjacent layer boards (2), the layer board (2) located on the upper side along the height direction (Z) is the first layer board (2A), the monitoring component (4) is connected to the bottom side of the first layer board (2A), and the fireproof component (3) is located on the side of the monitoring component (4) away from the first layer board (2A).

3. The fireproof shelf according to claim 2, characterized in that: The monitoring component (4) comprises a hydrogen sensor (41) and a carbon monoxide sensor (42), wherein the hydrogen sensor (41) and the carbon monoxide sensor (42) are connected to the bottom side of the first layer board (2A) at intervals, and the hydrogen sensor (41) and the carbon monoxide sensor (42) are both electrically connected to the control component (5).

4. The fireproof shelf according to claim 2, characterized in that: The control component (5) comprises an electric control box (51) and a first electromagnet component (52), the first electromagnet component (52) comprises a first electromagnetic male seat (521) and a first electromagnetic female seat (522), the first electromagnetic female seat (522) is electrically connected to the electric control box (51), and the monitoring component (4) is electrically connected to the electric control box (51); A plurality of the first electromagnet components (52) are provided between two adjacent layers (2), wherein a plurality of the first electromagnetic male seats (521) are connected to the edge of the fireproof component (3) at intervals, a plurality of the first electromagnetic female seats (522) are connected to the bottom side of the first layer (2A), and each of the first electromagnetic male seats (521) is detachably connected to a first electromagnetic female seat (522).

5. The fireproof shelf according to claim 4, characterized in that: The control assembly (5) further comprises a second electromagnet component (53), the second electromagnet component (53) comprising a second electromagnetic male seat (531) and a second electromagnetic female seat (532), the second electromagnetic female seat (532) being electrically connected to the electric control box (51); The second electromagnet component (53) is provided between two adjacent layers (2), wherein the second electromagnetic male seat (531) is connected to the middle of the fireproof component (3), and the second electromagnetic female seat (532) is connected to the bottom side of the first layer (2A), and the second electromagnetic male seat (531) and the second electromagnetic female seat (532) are detachably connected.

6. The fireproof shelf according to claim 4, characterized in that: The fireproof shelf further comprises a guide assembly (6), wherein the guide assembly (6) comprises a guide rod (61) and a slider (62), wherein the length of the guide rod (61) extends along the height direction (Z), and the slider (62) is slidably connected to the guide rod (61); A plurality of guide assemblies (6) are provided between two adjacent layer plates (2), and each of the first electromagnetic suction male seats (521) is connected to one guide assembly (6), wherein the first electromagnetic suction male seat (521) is connected to the slider (62), and the guide rod (61) is connected to the frame (1).

7. The fireproof shelf according to claim 4, characterized in that: The control component (5) further comprises an uninterruptible power supply (54), and the uninterruptible power supply (54) is electrically connected to the electric control box (51).

8. The fireproof shelf according to claim 1, characterized in that: The fireproof shelf further comprises a counterweight (7), and the counterweight (7) is connected to the edge of the fireproof component (3).

9. The fireproof shelf according to claim 8, characterized in that: The counterweight (7) is ring-shaped, arranged around the center of the fireproof component (3), and located on the top side of the fireproof component (3).

10. The fireproof shelf according to claim 1, characterized in that: The frame (1) is provided with a plurality of buckle holes (101); The layer plate (2) comprises a plate body (21) and a buckle body (22); the thickness of the plate body (21) extends along the height direction (Z); the plate body (21) is used to carry the goods (100); there are a plurality of buckle bodies (22), and a plurality of buckle bodies (22) are connected to the plate body (21); Wherein, each of the button holes (101) can be detachably clamped with a button body (22), the button body (22) is plate-shaped, and the button body (22) is inclined from top to bottom toward the inside of the button hole (101).

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