Trolley for transferring step support

Abstract

The utility model relates to a trolley for transferring step supports, and relates to the technical field of automobile part transferring equipment. The mounting frame is arranged on the transfer trolley; the clamping structure comprises a plurality of clamping assemblies which are arranged at intervals, the clamping assemblies are arranged on the mounting frame and comprise first clamping plates and second clamping plates which are connected with each other, rectangular grooves are formed in the upper sides of the first clamping plates and used for being matched with the transfer trolley to place and transfer the square step supports, and arc-shaped grooves are formed in the upper sides of the second clamping plates and used for being matched with the transfer trolley to transfer the square step supports. The device is used for being matched with a transfer trolley to place and transfer round step supports. The two stepping supports can be fixedly placed through the clamping assemblies, different trolleys do not need to be switched to transfer the two stepping supports, the transfer efficiency is improved, and the problems that the prior art is difficult to adapt to different types of stepping supports, a plurality of trolleys are needed to transfer different types of stepping supports, and the transfer efficiency is reduced are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile part transfer equipment, and particularly relates to a trolley for transferring step supports. Background Art

[0002] For commercial vehicle enterprises with multi-variety and small-batch mixed production, due to the diversity of their own products, a variety of step supports are required. Using forklifts for transfer may cause logistics chaos and reduce the economy of short-distance in-line transportation.

[0003] In the prior art, for example, a transfer and placement rack for an automobile exhaust pipe in CN218431361U includes a trolley device for limiting the bottom of the automobile exhaust pipe and moving it, and further includes a bracket device provided on the trolley device for limiting the top of the automobile exhaust pipe. A plurality of clamping devices for telescopically clamping the automobile exhaust pipe are symmetrically arranged in the bracket device; the bracket device includes a fixed frame, a plurality of fixed seats are symmetrically arranged before and after the fixed frame, a U-shaped groove is arranged in the middle of the fixed seat, and two grooves are symmetrically arranged on both sides of the fixed seat; the clamping device includes a sliding rod, and a limiting plate is fixedly installed at one end of the sliding rod. The transfer and placement rack for an automobile exhaust pipe of the utility model, through the independent limitation setting of each automobile exhaust pipe, facilitates the individual picking and placing of each automobile exhaust pipe; through the elastic clamping setting, the convenience of picking and placing operations is increased; through the setting of multiple limiting positions, the number of automobile exhaust pipes transferred at one time is guaranteed.

[0004] However, by cooperating the clamping device and the bracket device to clamp the workpiece to be transferred, the type of the workpiece to be transferred is related to the shape of the U-shaped groove. Since the step support includes a square step support and a circular step support, the prior art is difficult to be applicable to different types of step supports, and multiple trolleys are required to transfer different types of step supports, resulting in the problem of reduced transfer efficiency. Summary of the Utility Model

[0005] This application provides a trolley for transferring step supports, which can solve the problem in the prior art that by cooperating the clamping device and the bracket device to clamp the workpiece to be transferred, the type of the workpiece to be transferred is related to the shape of the U-shaped groove. Since the step support includes a square step support and a circular step support, the prior art is difficult to be applicable to different types of step supports, and multiple trolleys are required to transfer different types of step supports, resulting in the problem of reduced transfer efficiency.

[0006] In a first aspect, an embodiment of this application provides a trolley for transferring step supports, which includes:

[0007] A transfer trolley;

[0008] A mounting rack, which is arranged on the transfer trolley;

[0009] The clamping structure includes a plurality of clamping components arranged at intervals. The clamping components are arranged on the mounting frame and include a first clamping plate and a second clamping plate connected to each other. A rectangular groove is formed on the upper side of the first clamping plate for placing and transporting the square step support in cooperation with the transfer trolley. An arc groove is formed on the upper side of the second clamping plate for placing and transporting the circular step support in cooperation with the transfer trolley.

[0010] In one embodiment, the first clamping plate is connected to the mounting frame. The second clamping plate is located on the side of the first clamping plate away from the mounting frame, and the second clamping plate is outside the horizontal projection range of the rectangular groove on the first clamping plate.

[0011] In one embodiment, the mounting frame includes:

[0012] Two support columns, which are arranged on the transfer trolley at intervals;

[0013] A mounting cross beam, which is arranged between the two support columns and connected to the upper ends of the support columns. A plurality of the clamping components are arranged at intervals along the length direction on the mounting cross beam.

[0014] In one embodiment, the two support columns are respectively arranged in the middle of both sides of the transfer trolley. Two of the clamping components are arranged on the mounting cross beam, and the two clamping components are respectively located on both sides of the mounting cross beam.

[0015] In one embodiment, a slide rail is arranged on the mounting cross beam, and the clamping component is slidably arranged on the slide rail.

[0016] In one embodiment, a reinforcing cross beam is further arranged between the two support columns. Both ends of the reinforcing cross beam are respectively connected to the two support columns, and the reinforcing cross beam is located below the mounting cross beam.

[0017] In one embodiment, the support column includes two vertical rods arranged at intervals, and two horizontal rods arranged between the two vertical rods. The two horizontal rods are arranged at intervals along the length direction of the vertical rods. Both ends of the upper horizontal rod are connected to the upper ends of the two vertical rods. Both ends of the lower horizontal rod are connected to the middle parts of the two vertical rods. The middle part of the upper horizontal rod is connected to the mounting cross beam. The middle part of the lower horizontal rod is connected to the reinforcing cross beam.

[0018] In one embodiment, reinforcing plates are arranged on both sides of the support column, and the reinforcing plates are connected to the transfer trolley.

[0019] In one embodiment, the transfer trolley includes:

[0020] The base frame is provided with the mounting frame thereon and is used to support the square step support and the circular step support.

[0021] Four legs are arranged in a rectangle on the lower side of the base frame, and moving wheels are provided at the lower ends of the legs.

[0022] In one embodiment, the base frame includes:

[0023] The upper frame and the lower frame which are arranged at intervals and have the same cross-sectional area;

[0024] A plurality of connecting blocks are arranged at intervals along the circumference of the lower frame and are used to connect the upper frame and the lower frame.

[0025] The beneficial effects brought by the technical solution provided by the embodiment of the present application include:

[0026] When manufacturing the trolley for transporting the step support, the mounting frame is arranged on the transport trolley, and a plurality of clamping components arranged at intervals are all arranged on the mounting frame. The clamping component includes a first clamping plate and a second clamping plate which are connected to each other. A rectangular groove is opened on the upper side of the first clamping plate, and an arc groove is opened on the upper side of the second clamping plate. Since the rectangular groove opened on the upper side of the first clamping plate is used to cooperate with the transport trolley to place and transport the square step support, and the arc groove opened on the upper side of the second clamping plate is used to cooperate with the transport trolley to place and transport the circular step support, the fixed placement of the two types of step supports can be realized through the clamping component, and there is no need to switch different trolleys to transport the two types of step supports, which improves the transport efficiency and solves the problem in the prior art that the type of the workpiece to be transported is clamped by the cooperation of the clamping device and the bracket device, and the type of the workpiece to be transported is related to the shape of the U-shaped groove. Since the step support includes a square step support and a circular step support, it is difficult for the prior art to be applicable to different types of step supports, and multiple trolleys are required to transport different types of step supports, resulting in the problem of reduced transport efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a schematic structural diagram of an embodiment of a trolley for transporting a step support according to the present utility model.

[0029] Figure 2 It is a schematic structural diagram of an embodiment of a trolley for transporting a step support according to the present utility model after placing the square step support and the circular step support.

[0030] In the figure: 1. Transfer trolley; 11. Base frame; 111. Upper frame; 112. Lower frame; 113. Connecting block; 12. Leg; 13. Movable wheel; 2. Mounting frame; 21. Support column; 211. Vertical rod; 212. Horizontal rod; 22. Mounting cross beam; 23. Reinforcing cross beam; 3. Clamping assembly; 31. First clamping plate; 311. Rectangular groove; 32. Second clamping plate; 321. Arc groove; 4. Square step support; 5. Circular step support; 6. Reinforcing plate. Specific implementation mode

[0031] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0032] The embodiment of this application provides a trolley for transporting step supports, which can solve the problem in the prior art that by cooperating a clamping device and a bracket device to clamp the piece to be transported, the type of the piece to be transported is related to the shape of the U-shaped groove. Since the step support includes a square step support and a circular step support, it is difficult for the prior art to be applicable to different types of step supports, and multiple trolleys are required to transport different types of step supports, resulting in the problem of reduced transportation efficiency.

[0033] As Figure 1 and Figure 2 shown, this application provides a trolley for transporting step supports, which includes:

[0034] Transfer trolley 1;

[0035] Mounting frame 2, which is arranged on the transfer trolley 1;

[0036] Clamping structure, which includes a plurality of clamping components 3 arranged at intervals. The clamping components 3 are arranged on the mounting frame 2 and include a first clamping plate 31 and a second clamping plate 32 connected to each other. A rectangular groove 311 is opened on the upper side of the first clamping plate 31 for placing and transporting the square step support 4 in cooperation with the transfer trolley 1, and an arc groove 321 is opened on the upper side of the second clamping plate 32 for placing and transporting the circular step support 5 in cooperation with the transfer trolley 1.

[0037] When manufacturing the trolley for transporting the step supports, the mounting bracket 2 is arranged on the transport trolley 1, and a plurality of spaced clamping components 3 are all arranged on the mounting bracket 2. The clamping component 3 includes a first clamping plate 31 and a second clamping plate 32 which are connected to each other. A rectangular groove 311 is formed on the upper side of the first clamping plate 31, and an arc groove 321 is formed on the upper side of the second clamping plate 32. Since the rectangular groove 311 formed on the upper side of the first clamping plate 31 is used to cooperate with the transport trolley 1 to place and transport the square step support 4, and the arc groove 321 formed on the upper side of the second clamping plate 32 is used to cooperate with the transport trolley 1 to place and transport the circular step support 5, the fixed placement of the two types of step supports can be realized through the clamping component 3, without switching different trolleys to transport the two types of step supports, improving the transport efficiency, and solving the problem in the prior art that the type of the workpiece to be transported is held by cooperating a clamping device and a bracket device, and the type of the workpiece to be transported is related to the shape of the U-shaped groove. Since the step support includes a square step support and a circular step support, it is difficult for the prior art to be applicable to different types of step supports, and multiple trolleys are required to transport different types of step supports, resulting in the problem of reducing the transport efficiency.

[0038] As Figure 1 shown, in an alternative embodiment, the first clamping plate 31 is connected to the mounting bracket 2, the second clamping plate 32 is located on the side of the first clamping plate 31 away from the mounting bracket 2, and the second clamping plate 32 is located outside the horizontal projection range of the rectangular groove 311 on the first clamping plate 31.

[0039] In this embodiment, the first clamping plate 31 is connected to the mounting bracket 2, the second clamping plate 32 is located on the side of the first clamping plate 31 away from the mounting bracket 2, and the second clamping plate 32 is located outside the horizontal projection range of the rectangular groove 311 on the first clamping plate 31, reducing the mutual interference between the rectangular groove 311 and the arc groove 321. The structure is simple, and both the square step support 4 and the circular step support 5 can be conveniently placed on the clamping component 3.

[0040] In this example, the lower sides of the first clamping plate 31 and the second clamping plate 32 are in the same plane, and the openings of the rectangular groove 311 and the arc groove 321 are both upward.

[0041] As Figure 1 and Figure 2 shown, in an alternative embodiment, the mounting bracket 2 includes:

[0042] Two support columns 21 which are spaced on the transport trolley 1;

[0043] A mounting cross beam 22 which is arranged between the two support columns 21 and is connected to the upper ends of the support columns 21. A plurality of clamping components 3 are arranged at intervals along the length direction on the mounting cross beam 22.

[0044] In this embodiment, the structure of the mounting bracket 2 is specifically described. The mounting bracket 2 includes a mounting cross beam 22 and two support columns 21. Among them, the two support columns 21 are arranged at intervals on the transfer trolley 1. The mounting cross beam 22 is arranged between the two support columns 21 and is connected to the upper ends of the support columns 21. A plurality of clamping components 3 are arranged at intervals along the length direction on the mounting cross beam 22. The structure is simple and it is convenient to be installed on the transfer trolley 1.

[0045] As Figure 1 and Figure 2 shown, in an alternative embodiment, the two support columns 21 are respectively arranged in the middle of both sides of the transfer trolley 1. Two clamping components 3 are arranged on the mounting cross beam 22, and the two clamping components 3 are respectively located on both sides of the mounting cross beam 22.

[0046] In this embodiment, the two support columns 21 are respectively arranged in the middle of both sides of the transfer trolley 1. Two clamping components 3 are arranged on the mounting cross beam 22, and the two clamping components 3 are respectively located on both sides of the mounting cross beam 22, which can facilitate the distinction between the left and right step supports, and it is not easy to be confused and picked up wrongly, which is convenient for identification and management.

[0047] In this example, the orientations of the two clamping components 3 are different.

[0048] In an alternative embodiment, a slide rail is arranged on the mounting cross beam 22, and the clamping component 3 is slidably arranged on the slide rail.

[0049] In this embodiment, a slide rail is arranged on the mounting cross beam 22, and the clamping component 3 is slidably arranged on the slide rail. The distance between adjacent clamping components 3 can be adjusted according to requirements, which is convenient for placing step supports of different types and sizes, and improves the applicability of the trolley for step support transfer.

[0050] As Figure 1 shown, in an alternative embodiment, a reinforcing cross beam 23 is further arranged between the two support columns 21. Both ends of the reinforcing cross beam 23 are respectively connected to the two support columns 21, and the reinforcing cross beam 23 is located below the mounting cross beam 22.

[0051] In this embodiment, a reinforcing cross beam 23 is further arranged between the two support columns 21. Both ends of the reinforcing cross beam 23 are respectively connected to the two support columns 21, and the reinforcing cross beam 23 is located below the mounting cross beam 22, which improves the stability of the mounting bracket 2.

[0052] As Figure 1 and Figure 2As shown, in an alternative embodiment, the support column 21 includes two vertically arranged rods 211 spaced apart from each other, and two cross rods 212 disposed between the two vertically arranged rods 211. The two cross rods 212 are spaced apart along the length direction of the vertically arranged rods 211. The two ends of the upper cross rod 212 are connected to the upper ends of the two vertically arranged rods 211, and the two ends of the lower cross rod 212 are connected to the middle parts of the two vertically arranged rods 211. The middle part of the upper cross rod 212 is connected to the mounting cross beam 22, and the middle part of the lower cross rod 212 is connected to the reinforcement cross beam 23.

[0053] In this embodiment, the specific structure of the support column 21 is described. The support column 21 includes two vertically arranged rods 211 spaced apart from each other, and two cross rods 212 disposed between the two vertically arranged rods 211. The two cross rods 212 are spaced apart along the length direction of the vertically arranged rods 211. The two ends of the upper cross rod 212 are connected to the upper ends of the two vertically arranged rods 211, and the two ends of the lower cross rod 212 are connected to the middle parts of the two vertically arranged rods 211. The middle part of the upper cross rod 212 is connected to the mounting cross beam 22, and the middle part of the lower cross rod 212 is connected to the reinforcement cross beam 23. The structure is simple, and the hollow design is more conducive to the lightweight of the trolley for transporting the step support.

[0054] As Figure 1 and Figure 2 shown, in an alternative embodiment, reinforcing plates 6 are provided on both sides of the support column 21, and the reinforcing plates 6 are connected to the transfer trolley 1.

[0055] In this embodiment, reinforcing plates 6 are provided on both sides of the support column 21, and the reinforcing plates 6 are connected to the transfer trolley 1, which improves the connection strength between the support column 21 and the transfer trolley 1 and further improves the stability of the mounting frame 2.

[0056] As Figure 1 and Figure 2 shown, in an alternative embodiment, the transfer trolley 1 includes:

[0057] A base frame 11, on which a mounting frame 2 is provided and which is used to support the square step support 4 and the circular step support 5;

[0058] Four legs 12, which are arranged in a rectangle on the lower side of the base frame 11, and moving wheels 13 are provided at the lower ends of the legs 12.

[0059] In this embodiment, the specific structure of the transfer trolley 1 is described. The transfer trolley 1 includes a base frame 11 and four legs 12. Among them, a mounting frame 2 is provided on the base frame 11 and it is used to support the square step support 4 and the circular step support 5. The four legs 12 are arranged in a rectangle on the lower side of the base frame 11, and moving wheels 13 are provided at the lower ends of the legs 12. The structure is simple, and the lightweight of the trolley for transporting the step support is further improved.

[0060] In this example, among the four moving wheels 13, two on the same side are fixed rollers, and the other two are universal rollers.

[0061] As Figure 1 shown, in an alternative embodiment, the base frame 11 includes:

[0062] An upper frame 111 and a lower frame 112 arranged at intervals, and the upper frame 111 and the lower frame 112 have the same cross-sectional area;

[0063] A plurality of connecting blocks 113, which are arranged at intervals along the circumferential direction of the lower frame 112 and are used to connect the upper frame 111 and the lower frame 112.

[0064] In this embodiment, the specific structure of the base frame 11 is described. The base frame 11 includes an upper frame 111, a lower frame 112 and a plurality of connecting blocks 113. Among them, the upper frame 111 and the lower frame 112 are arranged at intervals and have the same cross-sectional area. The plurality of connecting blocks 113 are arranged at intervals along the circumferential direction of the lower frame 112 and are used to connect the upper frame 111 and the lower frame 112, which is convenient for the forklift to lift and transfer the trolley 1.

[0065] In this example, the cross-sections of the upper frame 111 and the lower frame 112 are rectangular, and the four connecting blocks 113 are respectively arranged at the four corners of the rectangle, and the legs 12 are arranged corresponding to the connecting blocks 113.

[0066] In summary, when manufacturing the trolley for transporting the step support, the mounting frame 2 is arranged on the transfer trolley 1, and a plurality of clamping components 3 arranged at intervals are all arranged on the mounting frame 2. The clamping component 3 includes a first clamping plate 31 and a second clamping plate 32 which are connected to each other. A rectangular groove 311 is opened on the upper side of the first clamping plate 31, and an arc-shaped groove 321 is opened on the upper side of the second clamping plate 32. Since the rectangular groove 311 opened on the upper side of the first clamping plate 31 is used to cooperate with the transfer trolley 1 to place and transfer the square step support 4, and the arc-shaped groove 321 opened on the upper side of the second clamping plate 32 is used to cooperate with the transfer trolley 1 to place and transfer the circular step support 5, the fixed placement of the two types of step supports can be realized through the clamping component 3, without switching different trolleys to transfer the two types of step supports, improving the transfer efficiency, and solving the problem in the prior art that by using a clamping device and a bracket device to cooperate to clamp the workpiece to be transferred, the type of the workpiece to be transferred is related to the shape of the U-shaped groove. Since the step support includes a square step support and a circular step support, it is difficult for the prior art to be applicable to different types of step supports, and multiple trolleys are required to transfer different types of step supports, resulting in the problem of reducing the transfer efficiency.

[0067] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installed", "connected" and "coupled" 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, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0068] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0069] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A trolley for transporting a step support, characterized in that: include: Transfer trolley (1); A mounting frame (2) arranged on the transfer vehicle (1); A clamping structure, comprising a plurality of spaced-apart clamping assemblies (3), the clamping assemblies (3) being arranged on the mounting frame (2), and comprising a first clamping plate (31) and a second clamping plate (32) connected to each other, the first clamping plate (31) having a rectangular groove (311) on its upper side for cooperating with the transfer trolley (1) to place and transport a square step support (4), the second clamping plate (32) having an arc groove (321) on its upper side for cooperating with the transfer trolley (1) to place and transport a circular step support (5).

2. A trolley for transporting a step support as claimed in claim 1, characterized in that: The first clamping plate (31) is connected to the mounting frame (2), the second clamping plate (32) is located on a side of the first clamping plate (31) away from the mounting frame (2), and the second clamping plate (32) is located outside the horizontal projection range of the rectangular groove (311) on the first clamping plate (31).

3. A trolley for transporting a step support as claimed in claim 1, characterized in that: The mounting frame (2) comprises: Two supporting columns (21), the two supporting columns (21) being arranged at intervals on the transfer vehicle (1); A mounting crossbeam (22) is arranged between the two supporting columns (21) and connected to the upper ends of the supporting columns (21). A plurality of the clamping assemblies (3) are arranged at intervals along the length direction on the mounting crossbeam (22).

4. A trolley for transporting a step support as claimed in claim 3, characterized in that: The two support columns (21) are respectively arranged in the middle of both sides of the transfer trolley (1); the installation beam (22) is provided with two clamping assemblies (3), and the two clamping assemblies (3) are respectively located on both sides of the installation beam (22).

5. A trolley for transporting a step support as claimed in claim 3, characterized in that: A slide rail is provided on the installation crossbeam (22), and the clamping assembly (3) is slidably arranged on the slide rail.

6. A trolley for transporting a step support as claimed in claim 3, characterized in that: A reinforcing crossbeam (23) is also provided between the two supporting columns (21), and the two ends of the reinforcing crossbeam (23) are respectively connected to the two supporting columns (21), and the reinforcing crossbeam (23) is located below the installation crossbeam (22).

7. A trolley for transporting a step support as claimed in claim 6, characterized in that: The supporting column (21) comprises two vertical rods (211) arranged at intervals, and two cross rods (212) arranged between the two vertical rods (211), the two cross rods (212) being arranged at intervals along the length direction of the vertical rods (211), the two ends of the upper cross rod (212) being connected to the upper ends of the two vertical rods (211), the two ends of the lower cross rod (212) being connected to the middle parts of the two vertical rods (211), the middle part of the upper cross rod (212) being connected to the mounting cross beam (22), and the middle part of the lower cross rod (212) being connected to the reinforcing cross beam (23).

8. A trolley for transporting a step support as claimed in claim 3, characterized in that: Reinforcement plates (6) are provided on both sides of the support column (21), and the reinforcement plates (6) are connected to the transfer trolley (1).

9. A trolley for transporting a step support as claimed in claim 1, characterized in that: The transfer vehicle (1) comprises: A base frame (11) on which the mounting frame (2) is provided and used to support the square step support (4) and the circular step support (5); Four supporting legs (12), the four supporting legs (12) are arranged in a rectangular shape on the lower side of the base frame (11), and moving wheels (13) are provided at the lower ends of the supporting legs (12).

10. A trolley for step support transfer as claimed in claim 9, characterized in that: The base frame (11) comprises: An upper skeleton (111) and a lower skeleton (112) are arranged at intervals, and the upper skeleton (111) and the lower skeleton (112) have the same cross-sectional area; A plurality of connection blocks (113) are arranged at intervals along the circumference of the lower skeleton (112) and are used to connect the upper skeleton (111) and the lower skeleton (112).

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