Heating pad, base assembly and transportation equipment

Abstract

The utility model provides a heating pad, a base assembly and a transportation device. The heating pad comprises a heating pad body and a base assembly, the heating pad plug is arranged on the heating pad body; the heating pad plug comprises a connecting part and a plug part, the connecting part is connected with the heating pad body, and the plug part is arranged on one side of the connecting part and connected with the plug part so as to be connected with or disconnected from the socket component; wherein the connecting part comprises a first fixing plate and a second fixing plate, the plug part is arranged on one of the first fixing plate and the second fixing plate, the first fixing plate and the second fixing plate are located on the two opposite sides of the heating pad body respectively, and the first fixing plate, the heating pad body and the second fixing plate are detachably connected through a plurality of first heating pad fasteners. The problem that in the prior art, a heating pad used in a transport case is complex in structure is solved.

Description

Technical Field

[0001] The utility model relates to the field of material transportation, and in particular to a heating pad, a base assembly and transportation equipment. Background Art

[0002] At present, turnover boxes are widely used in the packaging and transportation of liquid goods or granular or powdered goods. The turnover boxes generally include a base and a column arranged on the base, and the column is detachably inserted into the base. When the turnover box is in a storage state, the column needs to be pulled out from the base.

[0003] However, when a heating pad needs to be provided at the bottom of the turnover box, the heating pad used in the transport box in the prior art has a relatively complex structure and will occupy the space required for the materials. Utility Model Content

[0004] The main purpose of the utility model is to provide a heating pad, a base assembly and a transport device to solve the problem that the structure of the heating pad used in the transport box in the prior art is relatively complicated.

[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the utility model, a heating pad is provided, comprising: a heating pad body; a heating pad plug, the heating pad plug is arranged on the heating pad body; the heating pad plug comprises a connecting part and a plug part, the connecting part is connected to the heating pad body, the plug part is arranged on one side of the connecting part and is connected to the plug part, so as to be plugged in or disconnected with the socket component; wherein the connecting part comprises a first fixing plate and a second fixing plate, the plug part is arranged on one of the first fixing plate and the second fixing plate, the first fixing plate and the second fixing plate are respectively located on opposite sides of the heating pad body, and the first fixing plate, the heating pad body and the second fixing plate are detachably connected by a plurality of first heating pad fasteners.

[0006] Furthermore, the first fixing plate and the second fixing plate are both strip-shaped plates extending along a predetermined direction.

[0007] Furthermore, one of the first fixing plate and the second fixing plate is provided with a plurality of first through holes, the other of the first fixing plate and the second fixing plate is provided with a plurality of first threaded holes, and the heating pad body is provided with a plurality of second through holes. The plurality of first through holes, the plurality of first threaded holes and the plurality of second through holes are all provided in one-to-one correspondence with the plurality of first heating pad fasteners, and the threaded ends of the respective first heating pad fasteners are all passed through the corresponding first through holes and the corresponding second through holes and then tightened in the corresponding first threaded holes.

[0008] Furthermore, the first fixing plate and the second fixing plate both include an integrally injection-molded main board body, and one of the first fixing plate and the second fixing plate includes a plurality of second heating pad fasteners arranged on the main board body, and the plurality of first threaded holes are arranged one-to-one on the plurality of second heating pad fasteners.

[0009] Furthermore, the heating pad plug is detachably mounted at the position to be installed through a plurality of second heating pad fasteners; a plurality of third through holes are arranged on one of the first fixing plate and the second fixing plate, a plurality of fourth through holes are arranged on the other of the first fixing plate and the second fixing plate, a plurality of fifth through holes are arranged on the heating pad body, and a plurality of second threaded holes are arranged at the position to be installed, and the plurality of third through holes, the plurality of second threaded holes, the plurality of fifth through holes and the plurality of second threaded holes are all arranged one-to-one correspondingly to the plurality of second heating pad fasteners, and the threaded ends of the respective second heating pad fasteners are all passed through the corresponding third through holes, the corresponding fifth through holes and the corresponding fourth through holes and then tightened in the corresponding second threaded holes.

[0010] Furthermore, the plug part includes: a plug shell, the plug shell is integrally injection molded with one of the first fixing plate and the second fixing plate, and the side of the plug shell away from the heating pad body is used for plugging and mating with the socket shell of the socket component; a plug conductive component, the first end of the plug conductive component is electrically connected to the heating pad body after passing through the plug shell, and the second end of the plug conductive component is located outside the plug shell for conductive contact with the socket conductive component of the socket component.

[0011] According to a second aspect of the utility model, a base assembly is provided, comprising: a base; a heating pad, the heating pad being the above-mentioned heating pad, and the heating pad being located on a bearing surface of the base.

[0012] Furthermore, the base assembly includes a socket component, and the base is provided with: a fixed plate avoidance groove, the fixed plate avoidance groove is used to avoid one of the first fixed plate and the second fixed plate; a socket mounting groove, the socket mounting groove is used to install the socket component, and the socket mounting groove is connected to the fixed plate avoidance groove.

[0013] Furthermore, the socket component includes a socket shell and a socket conductive component installed on the socket shell, the first end of the socket shell is used for the plug shell of the plug part to be inserted, the first end of the socket conductive component is used for conductive contact with the plug conductive component of the plug part, and the second end of the socket conductive component is connected to the external power supply device through an external wiring harness.

[0014] Furthermore, the heating pad plug is detachably mounted on the base through a plurality of second heating pad fasteners; a plurality of second metal nuts are arranged on the bottom surface of the fixing plate avoidance groove, and the plurality of second metal nuts are arranged one-to-one correspondingly to the plurality of second heating pad fasteners, and the threaded end of each second heating pad fastener is tightened into the second threaded hole on the corresponding second metal nut after passing through the heating pad plug.

[0015] According to a third aspect of the utility model, a transport device is provided, which is placed on a supporting base surface, and the transport device comprises: a base assembly, which is the above-mentioned base assembly; a bracket, which is connected to the base, and the bracket comprises a plurality of column stops, which are arranged on the base at intervals along the circumference of the base, and the first end of each column stop passes through the base to reach a side of the base close to the supporting base surface, and the second end of each column stop is located on a side of the base away from the supporting base surface; a plurality of columns, which are installed on the plurality of column stops in a one-to-one correspondence, and each column is located on a side of the base away from the supporting base surface, and each column is movably arranged relative to the corresponding column stop to have an unfolded position perpendicular to the base and a stored position parallel to the base.

[0016] Applying the technical solution of the utility model, the heating pad of the utility model comprises: a heating pad body; a heating pad plug, which is arranged on the heating pad body; the heating pad plug comprises a connecting part and a plug part, the connecting part is connected to the heating pad body, the plug part is arranged at one side of the connecting part and is connected to the plug part, so as to be plugged in or disconnected with the socket component; wherein the connecting part comprises a first fixing plate and a second fixing plate, the plug part is arranged on one of the first fixing plate and the second fixing plate, the first fixing plate and the second fixing plate are respectively located on opposite sides of the heating pad body, the first fixing plate, the heating pad body and the second fixing plate are detachably connected by a plurality of first heating pad fasteners, so as to solve the problem that the structure of the heating pad used in the transport box in the prior art is relatively complex. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of the structure of a heating pad according to an embodiment of the utility model in one direction is shown;

[0019] Figure 2 Shows Figure 1 A partial enlarged view of the heating pad shown;

[0020] Figure 3 Shows Figure 1A schematic diagram of the structure of the heating pad shown in another direction;

[0021] Figure 4 Shows Figure 3 A partial enlarged view of the heating pad shown;

[0022] Figure 5 Shows Figure 1 A side view of the heating pad is shown;

[0023] Figure 6 Shows Figure 1 A schematic structural diagram of a heating pad body of the heating pad shown;

[0024] Figure 7 A schematic structural diagram of an embodiment of a base assembly according to the utility model when a heating pad is not included is shown;

[0025] Figure 8 Shows Figure 7 A top view of the base assembly is shown;

[0026] Fig. 9 Shows Figure 7 A schematic diagram of the structure of the base assembly shown includes a heating pad;

[0027] Fig.10 Shows Figure 7 A schematic structural diagram of the socket component of the base assembly shown;

[0028] Fig.11 Shows Fig.10 A top view of the socket shown;

[0029] Fig.12 A schematic structural diagram of an embodiment of the transport equipment according to the utility model is shown.

[0030] The above drawings include the following reference numerals:

[0031] 1. Base; 11. Socket mounting slot; 110. Fixing plate avoidance slot; 1101. Second threaded hole;

[0032] 2. Column stopper;

[0033] 3. Column;

[0034] 73. Socket component; 730. Socket housing; 735. Socket conductive component;

[0035] 9. Heating pad; 90. Heating pad body; 901. Second through hole; 902. Fifth through hole; 903. Main body; 91. Heating pad plug; 92. Connecting part; 93. Plug part; 931. Plug shell; 932. Plug conductive part; 94. First fixing plate; 941. First through hole; 942. Third through hole; 95. Second fixing plate; 951. First threaded hole; 952. Fourth through hole; 96. Second heating pad fastener. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] like Figures 1 to 6 As shown, the utility model provides a heating pad, comprising: a heating pad body 90; a heating pad plug 91, the heating pad plug 91 is arranged on the heating pad body 90; the heating pad plug 91 comprises a connecting portion 92 and a plug portion 93, the connecting portion 92 is connected to the heating pad body 90, the plug portion 93 is arranged on one side of the connecting portion 92 and is connected to the plug portion 93, so as to be plugged in or disconnected with the socket component 73; wherein, the connecting portion 92 comprises a first fixing plate 94 and a second fixing plate 95, the plug portion 93 is arranged on one of the first fixing plate 94 and the second fixing plate 95, the first fixing plate 94 and the second fixing plate 95 are respectively located on opposite sides of the heating pad body 90, the first fixing plate 94, the heating pad body 90 and the second fixing plate 95 are detachably connected by a plurality of first heating pad fasteners, so as to solve the problem that the structure of the heating pad used in the transport box in the prior art is relatively complex.

[0038] like Figures 1 to 6 As shown, the first fixing plate 94 and the second fixing plate 95 are both strip-shaped plates extending along a predetermined direction.

[0039] like Figures 1 to 6 As shown, one of the first fixing plate 94 and the second fixing plate 95 is provided with a plurality of first through holes 941, the other of the first fixing plate 94 and the second fixing plate 95 is provided with a plurality of first threaded holes 951, and the heating pad body 90 is provided with a plurality of second through holes 901. The plurality of first through holes 941, the plurality of first threaded holes 951 and the plurality of second through holes 901 are all provided in one-to-one correspondence with the plurality of first heating pad fasteners, and the threaded ends of the respective first heating pad fasteners are all passed through the corresponding first through holes 941 and the corresponding second through holes 901 and then tightened in the corresponding first threaded holes 951.

[0040] like Figures 1 to 6As shown, the first fixing plate 94 and the second fixing plate 95 both include an integrally injection-molded main board body 903, and one of the first fixing plate 94 and the second fixing plate 95 includes a plurality of second heating pad fasteners 96 arranged on the main board body 903, and a plurality of first threaded holes 951 are arranged one-to-one on the plurality of second heating pad fasteners 96.

[0041] like Figures 1 to 6 As shown, the heating pad plug 91 is detachably mounted at the position to be installed by means of a plurality of second heating pad fasteners 96; a plurality of third through holes 942 are provided on one of the first fixing plate 94 and the second fixing plate 95, a plurality of fourth through holes 952 are provided on the other of the first fixing plate 94 and the second fixing plate 95, a plurality of fifth through holes 902 are provided on the heating pad body 90, and a plurality of second threaded holes 1101 are provided at the position to be installed, the plurality of third through holes 942, the plurality of second threaded holes 1101, the plurality of fifth through holes 902 and the plurality of second threaded holes 1101 are all arranged one-to-one correspondingly to the plurality of second heating pad fasteners 96, and the threaded ends of the respective second heating pad fasteners 96 are all passed through the corresponding third through holes 942, the corresponding fifth through holes 902 and the corresponding fourth through holes 952 and then tightened in the corresponding second threaded holes 1101.

[0042] Specifically, the first heating pad fastener is a bolt, and the second heating pad fastener 96 is a nut.

[0043] like Figures 1 to 6 As shown, the plug portion 93 includes: a plug shell 931, the plug shell 931 is integrally injection-molded with one of the first fixing plate 94 and the second fixing plate 95, and the side of the plug shell 931 away from the heating pad body 90 is used for plugging and mating with the socket shell 730 of the socket component 73; a plug conductive component 932, a first end of the plug conductive component 932 is electrically connected to the heating pad body 90 after passing through the plug shell 931, and a second end of the plug conductive component 932 is located outside the plug shell 931 for conductive contact with the socket conductive component 735 of the socket component 73.

[0044] like Figures 7 to 11 As shown, the utility model provides a base assembly, including: a base 1; a heating pad 9, the heating pad 9 is the above-mentioned heating pad, and the heating pad 9 is located on the bearing surface of the base 1.

[0045] like Figures 7 to 11 As shown, the base assembly includes a socket component 73, and the base 1 is provided with: a fixed plate avoidance groove 110, the fixed plate avoidance groove 110 is used to avoid one of the first fixed plate 94 and the second fixed plate 95; a socket mounting groove 11, the socket mounting groove 11 is used to install the socket component 73, and the socket mounting groove 11 is connected to the fixed plate avoidance groove 110.

[0046] like Figures 7 to 11 As shown, the socket component 73 includes a socket shell 730 and a socket conductive component 735 installed on the socket shell 730, the first end of the socket shell 730 is used for the plug shell 931 of the plug part 93 to be inserted, the first end of the socket conductive component 735 is used for conductive contact with the plug conductive component 932 of the plug part 93, and the second end of the socket conductive component 735 is connected to an external power supply device through an external wiring harness.

[0047] like Figures 7 to 11 As shown, the heating pad plug 91 is detachably mounted on the base 1 through a plurality of second heating pad fasteners 96; a plurality of second metal nuts are arranged on the bottom surface of the fixing plate avoidance groove 110, and the plurality of second metal nuts are arranged one-to-one correspondingly to the plurality of second heating pad fasteners 96, and the threaded end of each second heating pad fastener 96 passes through the heating pad plug 91 and is tightened into the second threaded hole 1101 on the corresponding second metal nut.

[0048] like Fig.12 As shown, the utility model also provides a transportation device, which is placed on a supporting base surface, and the transportation device includes: a base assembly, which is the above-mentioned base assembly; a bracket, which is connected to the base 1, and the bracket includes a plurality of column stops 2, which are arranged on the base 1 at intervals along the circumference of the base 1, and the first end of each column stop 2 passes through the base 1 and reaches the side of the base 1 close to the supporting base surface, and the second end of each column stop 2 is located on the side of the base 1 away from the supporting base surface; a plurality of columns 3, the plurality of columns 3 are installed on the plurality of column stops 2 one by one, and each column 3 is located on the side of the base 1 away from the supporting base surface, and each column 3 is movably arranged relative to the corresponding column stop 2 to have an unfolded position perpendicular to the base 1 and a stored position parallel to the base 1.

[0049] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0050] The heating pad of the utility model comprises: a heating pad body 90; a heating pad plug 91, the heating pad plug 91 is arranged on the heating pad body 90; the heating pad plug 91 comprises a connecting portion 92 and a plug portion 93, the connecting portion 92 is connected to the heating pad body 90, the plug portion 93 is arranged on one side of the connecting portion 92 and connected to the plug portion 93, so as to be plugged in or disconnected with the socket component 73; wherein, the connecting portion 92 comprises a first fixing plate 94 and a second fixing plate 95, the plug portion 93 is arranged on one of the first fixing plate 94 and the second fixing plate 95, the first fixing plate 94 and the second fixing plate 95 are respectively located on opposite sides of the heating pad body 90, the first fixing plate 94, the heating pad body 90 and the second fixing plate 95 are detachably connected by a plurality of first heating pad fasteners, so as to solve the problem that the structure of the heating pad used in the transport box in the prior art is relatively complicated.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts described in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0053] In the description of the present application, it should be understood that the components or component placement relationships indicated by component terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the components or component placement relationships described in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these component terms do not indicate or imply that the referred device or element must have specific components or be constructed and operated with specific components, and therefore cannot be understood as limiting the scope of protection of the present application; the component terms "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0054] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial component position relationship between a device or feature and other devices or features as described in the figure. It should be understood that the spatially relative terms are intended to include different components of the device in use or operation in addition to the components described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be followed by components that are defined as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be defined in other different ways (rotated 90 degrees or in other components), and the spatially relative descriptions used here are interpreted accordingly.

[0055] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0056] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A heating pad, characterized in that: include: A heating pad body (90); A heating pad plug (91), the heating pad plug (91) being arranged on the heating pad body (90); the heating pad plug (91) comprising a connecting portion (92) and a plug portion (93), the connecting portion (92) being connected to the heating pad body (90), the plug portion (93) being arranged on one side of the connecting portion (92) and connected to the plug portion (93) so as to be connected to or disconnected from the socket component (73); Wherein, the connecting portion (92) includes a first fixing plate (94) and a second fixing plate (95), the plug portion (93) is arranged on one of the first fixing plate (94) and the second fixing plate (95), the first fixing plate (94) and the second fixing plate (95) are respectively located on opposite sides of the heating pad body (90), and the first fixing plate (94), the heating pad body (90) and the second fixing plate (95) are detachably connected by a plurality of first heating pad fasteners.

2. The heating pad according to claim 1, characterized in that The first fixing plate (94) and the second fixing plate (95) are both strip-shaped plates extending along a predetermined direction.

3. The heating pad according to claim 1, characterized in that A plurality of first through holes (941) are provided on one of the first fixing plate (94) and the second fixing plate (95), a plurality of first threaded holes (951) are provided on the other of the first fixing plate (94) and the second fixing plate (95), and a plurality of second through holes (901) are provided on the heating pad body (90). The plurality of first through holes (941), the plurality of first threaded holes (951) and the plurality of second through holes (901) are all provided in one-to-one correspondence with the plurality of first heating pad fasteners, and the threaded ends of the respective first heating pad fasteners are all passed through the corresponding first through hole (941) and the corresponding second through hole (901) and then tightened in the corresponding first threaded hole (951).

4. The heating pad according to claim 3, characterized in that The first fixing plate (94) and the second fixing plate (95) both include an integrally injection-molded main plate body (903), and one of the first fixing plate (94) and the second fixing plate (95) includes a plurality of second heating pad fasteners (96) arranged on the main plate body (903), and the plurality of first threaded holes (951) are arranged one-to-one on the plurality of second heating pad fasteners (96).

5. The heating pad according to claim 1, characterized in that The heating pad plug (91) is detachably mounted at the position to be installed via a plurality of second heating pad fasteners (96); a plurality of third through holes (942) are provided on one of the first fixing plate (94) and the second fixing plate (95); a plurality of fourth through holes (952) are provided on the other of the first fixing plate (94) and the second fixing plate (95); a plurality of fifth through holes (902) are provided on the heating pad body (90); and a plurality of second threaded holes (1102) are provided at the position to be installed. 1), the plurality of third through holes (942), the plurality of second threaded holes (1101), the plurality of fifth through holes (902) and the plurality of second threaded holes (1101) are all arranged in one-to-one correspondence with the plurality of second heating pad fasteners (96), and the threaded ends of each of the second heating pad fasteners (96) pass through the corresponding third through hole (942), the corresponding fifth through hole (902) and the corresponding fourth through hole (952) and are then tightened in the corresponding second threaded hole (1101).

6. The heating pad according to claim 1, characterized in that The plug portion (93) comprises: a plug shell (931), the plug shell (931) being integrally injection-molded with one of the first fixing plate (94) and the second fixing plate (95), and a side of the plug shell (931) away from the heating pad body (90) being used for plugging and mating with the socket shell (730) of the socket component (73); A plug conductive component (932), wherein a first end of the plug conductive component (932) passes through the plug shell (931) and is electrically connected to the heating pad body (90), and a second end of the plug conductive component (932) is located outside the plug shell (931) for conductive contact with the socket conductive component (735) of the socket component (73).

7. A base assembly, characterized in that: include: Base (1); A heating pad (9), wherein the heating pad (9) is the heating pad according to any one of claims 1 to 6, and the heating pad (9) is located on the bearing surface of the base (1).

8. The base assembly according to claim 7, characterized in that: The base assembly comprises a socket component (73), and the base (1) is provided with: A fixing plate avoidance groove (110), the fixing plate avoidance groove (110) being used to avoid one of the first fixing plate (94) and the second fixing plate (95); A socket installation groove (11), the socket installation groove (11) is used to install the socket component (73), and the socket installation groove (11) is connected to the fixing plate avoidance groove (110).

9. The base assembly according to claim 8, characterized in that: The socket component (73) comprises a socket shell (730) and a socket conductive component (735) mounted on the socket shell (730); the first end of the socket shell (730) is used for the plug shell (931) of the plug part (93) to be inserted; the first end of the socket conductive component (735) is used for conductive contact with the plug conductive component (932) of the plug part (93); and the second end of the socket conductive component (735) is connected to an external power supply device via an external wiring harness.

10. The base assembly according to claim 8, characterized in that: The heating pad plug (91) is detachably mounted on the base (1) via a plurality of second heating pad fasteners (96); a plurality of second metal nuts are arranged on the bottom surface of the fixing plate avoidance groove (110), and the plurality of second metal nuts are arranged one-to-one correspondingly to the plurality of second heating pad fasteners (96), and the threaded end of each second heating pad fastener (96) passes through the heating pad plug (91) and is tightened into the second threaded hole (1101) on the corresponding second metal nut.

11. A transport device, characterized in that: The transport equipment is placed on a supporting base, and the transport equipment comprises: A base assembly, wherein the base assembly is the base assembly according to any one of claims 7 to 10; A bracket, the bracket being connected to the base (1), the bracket comprising a plurality of column stoppers (2), the plurality of column stoppers (2) being arranged on the base (1) at intervals along the circumference of the base (1), the first end of each column stopper (2) passing through the base (1) and reaching a side of the base (1) close to the supporting base surface, and the second end of each column stopper (2) being located on a side of the base (1) away from the supporting base surface; A plurality of columns (3), the plurality of columns (3) being mounted one by one on the plurality of column stoppers (2), each of the columns (3) being located on a side of the base (1) away from the supporting base surface, and each of the columns (3) being movably arranged relative to the corresponding column stopper (2) to have an extended position perpendicular to the base (1) and a stored position parallel to the base (1).

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