Overturning type high-voltage isolating switch overturning vehicle

Abstract

The utility model belongs to the technical field of bullet train high-voltage isolating switch maintenance, and discloses an overturning type high-voltage isolating switch overturning vehicle, which is used for overturning and transferring a high-voltage isolating switch, and comprises a supporting assembly, a rotating assembly, a driving assembly and an overturning frame, the rotating assembly comprises a rotating shaft, the rotating shaft is rotationally connected to the supporting assembly, the driving assembly is connected to the rotating shaft, the two ends of the overturning frame are connected to the rotating shaft respectively, the overturning frame can rotate relative to the supporting assembly under driving of the driving assembly and keep static at any angle, and the high-voltage isolation switch is arranged on the overturning frame. According to the utility model, the high-voltage isolation switches of various models can be compatible and can be circulated among the maintenance stations, so that the maintenance difficulty is reduced by fixing the overturning angle, the application range of equipment is expanded, and the cost of the equipment is saved.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage disconnect switch maintenance technology for high-speed trains, and in particular to a tilting type high-voltage disconnect switch tilting vehicle. Background Technology

[0002] Currently, the maintenance of high-voltage disconnect switches in locomotives at EMU depots typically requires disassembly and reassembly of the switches, necessitating transfer between different maintenance stations. However, existing technologies mostly employ fixed support frames for the high-voltage disconnect switches, hindering transfer between maintenance stations and increasing maintenance complexity. Furthermore, the dimensions and types of high-voltage disconnect switches vary across different EMU depots, and existing support frames are only suitable for one type, failing to accommodate multiple models and resulting in high maintenance costs. Therefore, finding a solution that allows compatibility with multiple high-voltage disconnect switch models and facilitates transfer between maintenance stations, reducing maintenance complexity while expanding equipment applicability and saving costs, is a problem that needs to be solved by those in the field. Utility Model Content

[0003] The purpose of this utility model is to provide a flip-type high-voltage disconnect switch flip-over vehicle that is compatible with various models of high-voltage disconnect switches and can be moved between various maintenance stations, reducing maintenance difficulty, expanding the scope of equipment application, and saving equipment costs.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A tilting-type high-voltage disconnector tilting trolley is used for tilting and transferring high-voltage disconnectors. The tilting-type high-voltage disconnector tilting trolley includes:

[0006] A support component, which is equipped with casters at its bottom;

[0007] A rotating assembly and a driving assembly, the rotating assembly including a rotating shaft rotatably connected to the support assembly, and the driving assembly connected to the rotating shaft;

[0008] A tilting frame, with its two ends connected to the rotating shaft, is capable of rotating relative to the support assembly under the drive of the drive assembly and remaining stationary at any angle. The high-voltage disconnecting switch is mounted on the tilting frame.

[0009] Optionally, the tilting frame includes a mounting plate, a fixing plate, and a support rod. The mounting plate is sleeved on the outside of the rotating shaft, the support rod is connected to the mounting plate through the fixing plate, and the high-voltage disconnecting switch is mounted on the support rod.

[0010] Optionally, the tilting frame also includes a fastener, and the support rod is provided with a fixing hole. The fastener passes through the fixing hole and the fixing plate in sequence to fix the support rod to the fixing plate.

[0011] Optionally, the support rod is provided with several connecting holes, and bolts are passed through the high-voltage disconnect switch and the connecting holes in sequence to fix the high-voltage disconnect switch to the flip frame.

[0012] Alternatively, the drive assembly includes a drive shaft, a reducer, and a crank, the drive shaft being connected to the rotating shaft, the output end of the reducer being connected to the drive shaft, and the crank being connected to the input end of the reducer.

[0013] Alternatively, the support assembly may be provided with a bracket on which the speed reducer is mounted.

[0014] Optionally, the rotating component is provided with a mounting sleeve, which is fixed to the support component, and the rotating shaft is rotatably connected to the mounting sleeve.

[0015] Optionally, the support assembly includes a bottom support frame and side support frames, with a side support frame vertically arranged at each end of the bottom support frame, the rotating component and the driving component both arranged on the side support frames, and the moving wheel arranged below the bottom support frame.

[0016] Optionally, the support assembly further includes a base plate that covers the bottom support frame and forms a rotation space between the base plate and the two side supports.

[0017] Optionally, the movable wheel includes directional wheels and omnidirectional wheels, with two directional wheels spaced apart on one side of the bottom of the support assembly and two omnidirectional wheels spaced apart on the other side of the bottom of the support assembly.

[0018] The beneficial effects of this utility model are:

[0019] This utility model discloses a tilting high-voltage disconnect switch tilting trolley that can be used for tilting and transferring different types of high-voltage disconnect switches. Compared with the existing technology where the support frame can only be used for a single model, it expands the applicability of the equipment, saves equipment costs, and achieves the effect of compatible use of multiple models of high-voltage disconnect switches. Furthermore, the support assembly is equipped with casters at the bottom, allowing the tilting high-voltage disconnect switch tilting trolley to move the high-voltage disconnect switch between various maintenance stations, which can significantly improve maintenance efficiency and reduce maintenance difficulty. Specifically, the rotating shaft in the rotating assembly is rotatably connected to the support assembly, and the drive assembly is connected to the rotating shaft to provide a power source, reducing manual labor and improving tilting efficiency. Furthermore, both ends of the tilting frame are connected to the rotating shaft, so that when the drive shaft of the drive assembly rotates, the tilting frame can rotate relative to the support assembly under the drive of the rotating shaft. In this utility model, the tilting frame can remain stationary after rotating at any angle, thus adapting to the maintenance needs of operators and achieving efficient maintenance. Attached Figure Description

[0020] Figure 1 This is a first axonometric view of the tilting cart of the tilting high-voltage disconnector described in this embodiment of the utility model;

[0021] Figure 2 This is a second axonometric view of the tilting cart of the tilting high-voltage disconnector described in this embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the support assembly in the tilting cart of the tilting high-voltage disconnector described in this embodiment of the utility model;

[0023] Figure 4 This is a bottom view of the support assembly in the tilting cart of the tilting high-voltage disconnector described in this embodiment of the utility model;

[0024] Figure 5 yes Figure 2 A magnified view of a portion of point A in the middle;

[0025] Figure 6 This is a schematic diagram of the support rod in the tilting vehicle of the tilting high-voltage disconnect switch described in this embodiment of the utility model;

[0026] Figure 7 This is a schematic diagram of the structure of the high-voltage disconnect switch mounted on the tilting vehicle according to an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the structure of the flip-type high-voltage disconnect switch flip-over vehicle described in this embodiment of the utility model, which loads the high-voltage disconnect switch and deflects it at a certain angle.

[0028] In the picture:

[0029] 100-High voltage disconnect switch; 10-Support assembly; 20-Rotating assembly; 30-Drive assembly; 40-Tilting frame; 50-Directional wheel; 60-Universal wheel;

[0030] 11-Bottom support frame; 12-Side support frame; 13-Bottom plate; 14-Connecting plate; 15-Support frame;

[0031] 111-Rib; 151-Support plate; 152-Rib plate;

[0032] 21-Shaft; 22-Mounting sleeve; 31-Drive shaft; 32-Reducer; 33-Handle;

[0033] 41-Mounting plate; 42-Fixing plate; 43-Support rod; 44-Fastener; 431-Fixing hole; 432-Connecting hole. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] Currently, the maintenance of high-voltage disconnect switches in locomotives at EMU depots typically requires disassembly and reassembly of the switches, necessitating transfer between different maintenance stations. However, existing technologies mostly employ fixed support frames for the high-voltage disconnect switches, hindering transfer between maintenance stations and increasing maintenance complexity. Furthermore, the dimensions and types of high-voltage disconnect switches vary across different EMU depots, and existing support frames are only suitable for one type, failing to accommodate multiple models and resulting in high maintenance costs. Therefore, finding a solution that allows compatibility with multiple high-voltage disconnect switch models and facilitates transfer between maintenance stations, reducing maintenance complexity while expanding equipment applicability and saving costs, is a problem that needs to be solved by those in the field.

[0038] The technical solution of this embodiment will be further described below with reference to the accompanying drawings and specific implementation methods.

[0039] like Figures 1-8 As shown, this embodiment provides a flip-type high-voltage disconnect switch flip-over cart for flipping and transporting the high-voltage disconnect switch 100. The flip-type high-voltage disconnect switch flip-over cart includes a support assembly 10, a rotating assembly 20, a drive assembly 30, and a flip frame 40. The support assembly 10 is provided with a moving wheel at its bottom. The rotating assembly 20 includes a rotating shaft 21, which is rotatably connected to the support assembly 10. The drive assembly 30 is connected to the rotating shaft 21. The two ends of the flip frame 40 are respectively connected to the rotating shaft 21, and the flip frame 40 can rotate relative to the support assembly 10 under the drive of the drive assembly 30 and remain stationary at any angle. The high-voltage disconnect switch 100 is mounted on the flip frame 40.

[0040] Specifically, in this embodiment, the tilting high-voltage disconnect switch tilting cart can be used for tilting and transferring different types of high-voltage disconnect switches 100. Compared with the existing technology where the support frame can only be used for a single model, this expands the applicability of the equipment, saves equipment costs, and achieves the effect of compatible use of multiple models of high-voltage disconnect switches 100. Furthermore, the support assembly 10 is equipped with casters at its bottom, enabling the tilting high-voltage disconnect switch tilting cart to move the high-voltage disconnect switch 100 between various maintenance stations, which can significantly improve maintenance efficiency and reduce maintenance difficulty. Specifically, the rotating shaft 21 in the rotating assembly 20 is rotatably connected to the support assembly 10, and the drive assembly 30 is connected to the rotating shaft 21 to provide a power source, reducing manual labor and improving tilting efficiency. Furthermore, both ends of the tilting frame 40 are connected to the rotating shaft 21, so that when the drive shaft 21 of the drive assembly 30 rotates, the tilting frame 40 can rotate relative to the support assembly 10 under the drive of the rotating shaft 21. In this embodiment, the tilting frame 40 can remain stationary after rotating at any angle, thus adapting to the maintenance needs of operators and achieving efficient maintenance.

[0041] The specific structure of the tilting cart for the tilting high-voltage disconnector in this embodiment will be described below.

[0042] Combination Figures 1-2 and Figures 7-8 As shown, in this embodiment, the tilting high-voltage disconnector trolley is mainly used for tilting and transporting the high-voltage disconnector 100 to improve its maintenance efficiency and quickly transport it to the target location. Furthermore, the tilting high-voltage disconnector trolley enables the transport and maintenance of different types of high-voltage disconnectors 100, achieving compatibility with different models, expanding its applicability, and saving equipment costs. Optionally, in this embodiment, the tilting high-voltage disconnector trolley includes a support assembly 10, a rotating assembly 20, a drive assembly 30, a tilting frame 40, and moving wheels. Optionally, the moving wheels are located at the bottom of the support assembly 10 to achieve the overall transport and movement of the support assembly 10. Further, both the rotating assembly 20 and the drive assembly 30 are mounted on the support assembly 10, and the drive assembly 30 is connected to the rotating assembly 20. Specifically, the two ends of the tilting frame 40 are respectively connected to the rotating component 20, and the tilting frame 40 can rotate relative to the supporting component 10 under the drive of the driving component 30 and the rotation component 20, and remain stationary at any angle, so that the operator can maintain the high-voltage disconnecting switch 100 at the optimal angle. Optionally, the high-voltage disconnecting switch 100 is mounted on the tilting frame 40, thereby enabling the tilting of the high-voltage disconnecting switch 100 using the tilting frame 40.

[0043] like Figure 3 and Figure 4 As shown, specifically, in this embodiment, the support assembly 10 includes a base support frame 11, side support frames 12, a base plate 13, a connecting plate 14, and a support frame 15. The base support frame 11 is provided with ribs 111, and the support frame 15 includes a support plate 151 and rib plates 152. Optionally, a side support frame 12 is vertically arranged at each end of the base support frame 11. The rotating assembly 20 and the driving assembly 30 are both arranged on the side support frames 12, and the moving wheels are arranged below the base support frame 11, thereby ensuring the movement of the entire vehicle body. Further, the base plate 13 covers the base support frame 11, and the base plate 13 and the two side support frames 12 form a rotation space, facilitating the subsequent adjustment of the rotation angle of the high-voltage disconnect switch 100 within the rotation space, ensuring the stable placement of the high-voltage disconnect switch 100, and avoiding interference with its rotation process. For example, the base support frame 11 is further provided with ribs 111 in the middle, thereby providing stable support for the base plate 13 when it is covered by the base support frame 11. For example, maintenance tools or other parts can also be placed on the base plate 13, which improves the space utilization of the support assembly 10 and realizes the multi-functionality of the tilting high-voltage disconnect switch tilting vehicle.

[0044] Furthermore, each side support 12 is provided with a connecting plate 14 at its top for connecting the rotating assembly 20, and one of the side support 12 is also provided with a support bracket 15 on its outer top for placing the drive assembly 30. Figure 4 As shown, the support plate 151 in the support frame 15 is arranged horizontally and spaced vertically from the connecting plate 14. Two ribs 152 are located below the support plate 151 and are perpendicular to it. Furthermore, the ribs 152 are triangular, with their two right-angled sides connected to the support plate 151 and the side support frame 12, respectively, to support the support plate 151 and ensure the stable placement of the drive assembly 30 on it. Figure 4 and Figure 1 As shown, exemplarily, the movable wheels in this embodiment include directional wheels 50 and omnidirectional wheels 60. In this embodiment, two directional wheels 50 and two omnidirectional wheels 60 are provided, with the two directional wheels 50 spaced apart on one side of the bottom of the base support frame 11, and the two omnidirectional wheels 60 spaced apart on the other side of the bottom of the base support frame 11, thereby ensuring the stability of the multi-angle adjustment and directional movement of the support assembly 10. Optionally, a square plate is installed at each of the four apex corners below the base support frame 11 for connecting the directional wheels 50 and the omnidirectional wheels 60.

[0045] like Figure 1 As shown, in this embodiment, the rotating component 20 includes a rotating shaft 21 and a mounting sleeve 22. Exemplarily, in this embodiment, the rotating shaft 21 is rotatably mounted on the side support frame 12 of the support component 10. The driving component 30 is connected to the rotating shaft 21, and both ends of the flipping frame 40 are also connected to the rotating shaft 21. Thus, the rotating shaft 21 can rotate on the side support frame 12 by the driving component 30, thereby causing the flipping frame 40 to rotate synchronously with it, achieving the rotation effect of the high-voltage disconnecting switch 100 after it is installed on the flipping frame 40. Specifically, in this embodiment, one end of the rotating shaft 21 is rotatably connected to the mounting sleeve 22, and the mounting sleeve 22 is fixedly connected to the connecting plate 14 on the support component 10. This allows for a rotatable connection between the rotating shaft 21 and the connecting plate 14. Therefore, when the rotating shaft 21 rotates relative to the mounting sleeve 22, the flipping frame 40 can rotate synchronously with it, ensuring relative rotation between the flipping frame 40 and the support component 10. Exemplarily, in this embodiment, the rotating shaft 21 can rotate 360°, thus the flipping frame 40 can also rotate 360°. In other embodiments, the rotatable connection between the rotating shaft 21 and the connecting plate 14 can also be achieved by bearings or other means, which are not limited here.

[0046] Combination Figure 1 and Figure 2As shown, in this embodiment, the drive assembly 30 includes a transmission shaft 31, a reducer 32, and a crank handle 33. Specifically, in this embodiment, the rotating assembly 20 is provided in two sets, that is, there are two rotating shafts 21 and two mounting sleeves 22, and each side support 12 is connected to a rotating shaft 21. Exemplarily, the drive assembly 30 is placed on the side support 12 with the support frame 15, and in this embodiment, only one set of drive assemblies 30 is provided, so that when one rotating shaft 21 is driven, the other rotating shaft 21 will passively rotate synchronously with it. Specifically, the transmission shaft 31 is connected to the rotating shaft 21, and the output end of the reducer 32 is connected to the transmission shaft 31, the crank handle 33 is connected to the input end of the reducer 32, and the reducer 32 is placed on the support frame 15, thereby ensuring the stable placement of the drive assembly 30 and realizing the stable output of the power source. For example, rotating the crank handle 33 drives the reducer 32 to operate, and its power is transmitted to the rotating shaft 21 via the drive shaft 31, thereby achieving the flipping effect of the tilting frame 40. Furthermore, with the reducer 32 in place, the position can be locked after flipping at any angle to keep it stationary, facilitating fixed-point maintenance by operators. The specific connection and locking methods are conventional in the art and will not be described in detail here. For example, the crank handle 33 is configured as a wheel-shaped structure, with a cylindrical handle protruding from the wheel-shaped structure for manual adjustment by operators.

[0047] like Figure 5 and Figure 6 As shown, in this embodiment, the tilting frame 40 includes a mounting plate 41, a fixing plate 42, a support rod 43, and fasteners 44. The support rod 43 has a fixing hole 431 and a connecting hole 432. Optionally, two mounting plates 41, fixing plates 42, and support rods 43 are provided. Each rotating shaft 21 has a mounting plate 41 sleeved on its outer side, and each mounting plate 41 is connected to a fixing plate 42. The two support rods 43 are parallel and spaced apart, and connected to the fixing plate 42. Thus, the support rods 43 can be fixedly connected to the mounting plate 41 via the fixing plate 42, so that when the mounting plate 41 rotates with the rotating shaft 21, the support rods 43 can rotate synchronously with it. Furthermore, the high-voltage disconnect switch 100 is mounted on the support rod 43, thereby achieving stable installation of the high-voltage disconnect switch 100 on the tilting high-voltage disconnect switch tilting vehicle.

[0048] For example, the fixing plate 42 is made of angle steel, and the two right-angled sides of the fixing plate 42 are respectively connected to the mounting plate 41 and the support rod 43. Figure 6As shown, specifically, both ends of the support rod 43 are provided with fixing holes 431. Fasteners 44 pass through the fixing holes 431 and fixing plates 42 in sequence, which can fix both ends of the support rod 43 to the two fixing plates 42 respectively, thereby achieving stable placement of a single support rod 43 on the two side supports 12. Correspondingly, another support rod 43 is also connected to the two fixing plates 42 by fasteners 44, so as to ensure the stable placement of the high-voltage disconnect switch 100 on the tilting frame 40 by the two support rods 43. For example, the support rod 43 is also provided with several connecting holes 432, and bolts pass through the mounting holes and connecting holes 432 on the edge of the high-voltage disconnect switch 100 in sequence, which can fix the high-voltage disconnect switch 100 to the tilting frame 40. Optionally, the position and number of connecting holes 432 can be set as needed to ensure that high-voltage disconnect switches 100 of different sizes can be installed on the tilting frame 40, thereby expanding the applicability of the tilting high-voltage disconnect switch tilting vehicle and achieving the purpose of multi-type compatibility.

[0049] Work process: Combining Figure 7 and Figure 8 As shown, the tilting frame 40 is adjusted to a horizontal position, and the high-voltage disconnecting switch 100 is stably installed on the tilting high-voltage disconnecting switch tilting cart using bolts; then the crank 33 is turned so that the tilting frame 40 drives the high-voltage disconnecting switch 100 to tilt to the target angle and hover at this position, where the operator can inspect the high-voltage disconnecting switch 100; finally, the moving wheels are used to push the support assembly 10 to transfer the tilting high-voltage disconnecting switch tilting cart and the high-voltage disconnecting switch 100 to other maintenance work positions.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A flip-type high-voltage disconnector flipping vehicle, used for flipping and transporting a high-voltage disconnector (100), characterized in that: The flip-over type high-voltage disconnector flip-over vehicle comprises: A support assembly (10), wherein a moving wheel is provided at the bottom of the support assembly (10); A rotating assembly (20) and a driving assembly (30), wherein the rotating assembly (20) comprises a rotating shaft (21), the rotating shaft (21) is rotatably connected to the supporting assembly (10), and the driving assembly (30) is connected to the rotating shaft (21); A flip frame (40), wherein both ends of the flip frame (40) are respectively connected to the rotating shaft (21), and the flip frame (40) can rotate relative to the supporting assembly (10) and remain stationary at any angle under the drive of the driving assembly (30), and the high-voltage disconnector (100) is mounted on the flip frame (40).

2. The flip-over type high-voltage disconnector flipping vehicle according to claim 1 is characterized in that: The flip frame (40) comprises a mounting plate (41), a fixing plate (42) and a support rod (43); the mounting plate (41) is sleeved on the outside of the rotating shaft (21); the support rod (43) is connected to the mounting plate (41) via the fixing plate (42); and the high-voltage disconnector (100) is mounted on the support rod (43).

3. The flip-over type high-voltage disconnector flipping vehicle according to claim 2 is characterized in that: The flip frame (40) further comprises a fastener (44), the support rod (43) is provided with a fixing hole (431), and the fastener (44) penetrates the fixing hole (431) and the fixing plate (42) in sequence to fix the support rod (43) to the fixing plate (42).

4. The flip-over type high-voltage disconnector flipping vehicle according to claim 2 is characterized in that: The support rod (43) is provided with a plurality of connection holes (432), and bolts are sequentially passed through the high-voltage disconnector (100) and the connection holes (432) so as to fix the high-voltage disconnector (100) on the flip frame (40).

5. The flip-over type high-voltage disconnector flipping vehicle according to claim 1 is characterized in that: The driving assembly (30) comprises a transmission shaft (31), a reducer (32) and a crank (33); the transmission shaft (31) is connected to the rotating shaft (21); the output end of the reducer (32) is connected to the transmission shaft (31); and the crank (33) is connected to the input end of the reducer (32).

6. The flip-over type high-voltage disconnector flipping vehicle according to claim 5 is characterized in that: The support assembly (10) is provided with a support bracket (15), and the reducer (32) is arranged on the support bracket (15).

7. The flip-over type high-voltage disconnector flipping vehicle according to claim 1 is characterized in that: The rotating assembly (20) is provided with a mounting sleeve (22), the mounting sleeve (22) is fixed on the supporting assembly (10), and the rotating shaft (21) is rotatably connected to the mounting sleeve (22).

8. The flip-over type high-voltage disconnector flipping vehicle according to claim 1 is characterized in that: The support assembly (10) comprises a bottom support frame (11) and a side support frame (12), wherein one side support frame (12) is vertically arranged at each end of the bottom support frame (11), the rotating assembly (20) and the driving assembly (30) are both arranged on the side support frame (12), and the moving wheel is arranged below the bottom support frame (11).

9. The flip-over type high-voltage disconnector flipping vehicle according to claim 8, characterized in that: The support assembly (10) further comprises a bottom plate (13), wherein the bottom plate (13) is covered on the top of the bottom support frame (11), and a rotation space is formed between the bottom plate (13) and the two side support frames (12).

10. The flip-over type high-voltage disconnector flipping vehicle according to claim 1, characterized in that: The movable wheels include fixed wheels (50) and universal wheels (60), wherein the two fixed wheels (50) are arranged at intervals on one side of the bottom of the support assembly (10), and the two universal wheels (60) are arranged at intervals on the other side of the bottom of the support assembly (10).

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