Aircraft hydraulic system pipeline exhaust auxiliary device

Abstract

The utility model belongs to the technical field of airplanes, and discloses an airplane hydraulic system pipeline exhaust auxiliary device which comprises a device body and a pipeline assembly, the pipeline assembly comprises a first exhaust pipe, a second exhaust pipe, a third exhaust pipe and a pipeline conversion piece, and the first exhaust pipe, the second exhaust pipe and the third exhaust pipe are all detachably connected with the device body. The pipeline conversion piece is connected with the first exhaust pipe, the second exhaust pipe and the third exhaust pipe. Thus, the first exhaust pipe is connected with an EDP pressure pipeline, the second exhaust pipe is connected with an EDP oil return pipeline, the third exhaust pipe is connected with an EDP oil suction pipeline, and the first exhaust pipe can be communicated with the second exhaust pipe or the third exhaust pipe under the action of the pipeline conversion piece, so that the pressure pipeline, the oil return pipeline and the oil suction pipeline of the EDP are subjected to exhaust work according to needs; and pipeline conversion tools of different specifications are prevented from being configured for multiple times, connection between the on-board pipeline and the ground oil vehicle pipeline is repeatedly disconnected, and the exhaust efficiency of the internal pipeline of the EDP is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aircraft, in particular to an auxiliary exhaust device for pipelines of an aircraft hydraulic system. Background Art

[0002] An airplane is a heavier-than-air aircraft with wings and one or more engines that can fly in the atmosphere under its own power. There are civil aircraft, military aircraft, etc. Civil aircraft, as a means of transport for people and goods, provide a key means of transportation for globalization.

[0003] In the related technology, the hydraulic energy system, as the secondary energy of the aircraft, can provide a power source for the ram air turbine. The hydraulic energy system of modern civil aircraft is generally composed of multiple hydraulic systems, and the power source of the hydraulic system is usually provided by EDP (Engine Driven Pump). Since air may be mixed between the components during the assembly process, there is a lot of air in the hydraulic pipelines and hydraulic user actuators and other components. The high air content in the hydraulic system may cause insufficient oil suction of the hydraulic pump, reduce the elastic modulus of the hydraulic oil, and cause cavitation of the hydraulic pump components, thereby affecting the performance, working stability and service life of the hydraulic pump. Therefore, after the aircraft hydraulic system is assembled, the internal pipeline of the EDP needs to be vented.

[0004] Since there are many pipes inside the EDP and the pipe joints have different specifications, multiple pipes of different specifications need to be configured to connect the oil truck pipes with the EDP pipes when exhausting or cleaning the EDP. When the exhaust pipes are removed, the operation space is small and the installation of the exhaust pipes takes a long time. After the exhaust work is completed, when the pipes are removed, the hydraulic oil may leak through the pipes, requiring the staff to spend extra time cleaning, resulting in low exhaust efficiency of the EDP internal pipes. Utility Model Content

[0005] The utility model aims to provide an auxiliary device for exhausting pipelines of an aircraft hydraulic system, so as to solve the problem of low exhaust efficiency of pipelines inside an EDP.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A pipeline exhaust auxiliary device for an aircraft hydraulic system includes a device body and a pipeline assembly, wherein the pipeline assembly includes a first exhaust pipe, a second exhaust pipe, a third exhaust pipe and a pipeline conversion component, wherein the first exhaust pipe, the second exhaust pipe and the third exhaust pipe are all detachably connected to the device body, and the pipeline conversion component is respectively connected to the first exhaust pipe, the second exhaust pipe and the third exhaust pipe, so as to enable the first exhaust pipe to be selectively connected to the second exhaust pipe or the third exhaust pipe.

[0008] Preferably, the pipeline assembly further includes a cleaning pipe, which is connected to the pipeline conversion component and is used for cleaning the first exhaust pipe, the second exhaust pipe and the third exhaust pipe.

[0009] Preferably, the pipeline conversion component is a two-position three-way reversing valve, and two of the two-position three-way reversing valves are provided. The two two-position three-way reversing valves are both arranged on the device body, the first exhaust pipe and the second exhaust pipe are respectively connected to the two connecting ports on one of the two-position three-way reversing valves, the third exhaust pipe and the cleaning pipe are respectively connected to the two connecting ports on the other two-position three-way reversing valve, and the two two-position three-way reversing valves are connected.

[0010] Preferably, the pipeline assembly further comprises a connecting pipe, both ends of which are respectively connected to the connecting ports on the two two-position three-way reversing valves.

[0011] Preferably, the aircraft hydraulic system pipeline exhaust auxiliary device also includes a first storage cabinet, which is connected to the device body and is used to store pipes that make up the pipeline.

[0012] Preferably, the aircraft hydraulic system pipeline exhaust auxiliary device also includes a second storage cabinet, a plug and a plug cap, and the second storage cabinet is connected to the device body and is used to store the plug and the plug cap.

[0013] Preferably, a bearing platform is provided in the second storage cabinet, and a plurality of placement holes are provided on the top surface of the bearing platform for storing the plug and the plug cap.

[0014] Preferably, the top surface of the device body is rotatably connected to a cover.

[0015] Preferably, a handle is fixedly connected to a side of the cover facing the inside of the device body, and / or a handle is fixedly connected to a side of the cover facing away from the inside of the device body.

[0016] Preferably, a handrail is fixedly connected to the side wall of the device body, and / or a pipe bracket is fixedly arranged on the side wall of the device body, and / or a plurality of universal wheels are arranged on the bottom surface of the device body, and / or a plurality of directional wheels are arranged on the bottom surface of the device body.

[0017] Beneficial effects of the utility model:

[0018] A pipeline exhaust auxiliary device for an aircraft hydraulic system includes a device body and a pipeline assembly, wherein the pipeline assembly includes a first exhaust pipe, a second exhaust pipe, a third exhaust pipe and a pipeline conversion component, wherein the first exhaust pipe, the second exhaust pipe and the third exhaust pipe are all detachably connected to the device body, and the pipeline conversion component is respectively connected to the first exhaust pipe, the second exhaust pipe and the third exhaust pipe, so as to enable the first exhaust pipe to be selectively connected to the second exhaust pipe or the third exhaust pipe.

[0019] In this way, when it is necessary to exhaust the internal pipeline of the EDP, the main body of the device is moved to the vicinity of the EDP, and the first exhaust pipe is connected to the EDP pressure pipeline, the second exhaust pipe is connected to the EDP return oil pipeline, and the third exhaust pipe is connected to the EDP oil suction pipeline. The first exhaust pipe can be connected to the second exhaust pipe or the third exhaust pipe through the pipeline conversion part according to work needs, avoiding repeated configuration of pipeline conversion tooling of different specifications and repeated disconnection of the on-board pipeline and the ground oil truck pipeline, thereby improving the efficiency of exhausting the internal pipeline of the EDP. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an auxiliary device for exhausting pipelines of an aircraft hydraulic system in one embodiment of the utility model;

[0021] Figure 2 It is a top view of an auxiliary device for exhausting pipelines of an aircraft hydraulic system in one embodiment of the utility model;

[0022] Figure 3 It is a side view of an auxiliary device for exhausting pipelines of an aircraft hydraulic system in one embodiment of the utility model;

[0023] Figure 4 It is a schematic diagram of the local structure of the supporting platform in one embodiment of the utility model.

[0024] In the figure:

[0025] 1. Device body; 11. Operating chamber; 12. Machine cover; 121. Handle; 13. Handrail; 14. Pipe support; 15. Universal wheel; 16. Fixed wheel; 2. Pipe assembly; 21. First exhaust pipe; 22. Second exhaust pipe; 23. Third exhaust pipe; 24. Pipe conversion piece; 25. Cleaning pipe; 26. Connecting pipe; 3. First storage cabinet; 4. Second storage cabinet; 41. Carrying platform; 411. Placement hole. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0027] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0030] See also Figure 1 and Figure 2 The utility model provides an aircraft hydraulic system pipeline exhaust auxiliary device, including a device body 1 and a pipeline assembly 2, the pipeline assembly 2 includes a first exhaust pipe 21, a second exhaust pipe 22, a third exhaust pipe 23 and a pipeline conversion member 24, the first exhaust pipe 21, the second exhaust pipe 22 and the third exhaust pipe 23 are all detachably connected to the device body 1, the pipeline conversion member 24 is respectively connected to the first exhaust pipe 21, the second exhaust pipe 22, and the third exhaust pipe 23, and is used to make the first exhaust pipe 21 selectively connected to the second exhaust pipe 22 or the third exhaust pipe 23.

[0031] In this embodiment, the device body 1 is a rectangular structure, the first exhaust pipe 21 and the second exhaust pipe 22 are detachably arranged on one side of the device body 1, the third exhaust pipe 23 is arranged on the other side of the device body 1, the end of the first exhaust pipe 21 away from the device body 1 is provided with a joint compatible with the EDP pressure pipeline joint, the end of the second exhaust pipe 22 away from the device body 1 is provided with a joint compatible with the EDP return oil pipeline joint, the end of the third exhaust pipe 23 away from the device body 1 is provided with a joint compatible with the EDP oil suction pipeline, and the pipeline conversion part 24 is arranged on the top surface of the device body 1.

[0032] In this way, the device body 1 is moved to the vicinity of the EDP, and the first exhaust pipe 21, the second exhaust pipe 22, and the third exhaust pipe 23 are respectively connected to the pressure pipeline, the oil return pipeline, and the oil suction pipeline of the EDP. The first exhaust pipe 21 is connected to the second exhaust pipe 22 or the third exhaust pipe 23 by controlling the pipeline conversion component 24. The different pipelines inside the EDP can be cleaned according to actual needs. At the same time, the number of times of replacing and configuring pipeline conversion tooling of different specifications is reduced, and repeated disconnection of the on-board pipeline and the ground oil truck pipeline is avoided. The situation where the hydraulic oil inside the pipeline flows to the outside due to disconnection of the pipeline is reduced, and the exhaust efficiency of the internal pipeline of the EDP is improved.

[0033] See also Figure 1 In some embodiments, the pipeline assembly 2 further includes a cleaning pipe 25 , which is connected to the pipeline conversion component 24 and is used to clean the first exhaust pipe 21 , the second exhaust pipe 22 and the third exhaust pipe 23 .

[0034] In this embodiment, the first exhaust pipe 21 , the second exhaust pipe 22 , the third exhaust pipe 23 and the cleaning pipe 25 are all hoses for facilitating the transportation of hydraulic oil; the cleaning pipe 25 is arranged on one side of the device body 1 connected to the third exhaust pipe 23 .

[0035] It can be understood that when it is necessary to clean the inside of the first exhaust pipe 21, the second exhaust pipe 22, and the third exhaust pipe 23, one end of the cleaning pipe 25 is connected to the ground oil truck, and the cleaning pipe 25 is connected to the first exhaust pipe 21, the second exhaust pipe 22, and the third exhaust pipe 23 respectively by operating the pipeline conversion part 24, so as to clean each pipeline.

[0036] It should be understood that the materials of the first exhaust pipe 21 , the second exhaust pipe 22 , the third exhaust pipe 23 and the cleaning pipe 25 can be adjusted according to actual needs, and no more details are given here.

[0037] See also Figure 2In some embodiments, the pipeline conversion component 24 is a two-position three-way reversing valve (not shown in the figure), two two-position three-way reversing valves are provided, and the two two-position three-way reversing valves are both provided on the device body 1, the first exhaust pipe 21 and the second exhaust pipe 22 are respectively connected to the two connecting ports on one of the two-position three-way reversing valves, the third exhaust pipe 23 and the cleaning pipe 25 are respectively connected to the two connecting ports on the other two-position three-way reversing valve, and the two two-position three-way reversing valves are connected. In this embodiment, an operating chamber 11 is opened on the top surface of the device body 1, and the two two-position three-way reversing valves are both provided in the operating chamber 11.

[0038] It can be understood that the pipeline conversion component 24 can also be a flow control valve (not shown in the figure). There are four flow control valves. The first exhaust pipe 21, the second exhaust pipe 22, the third exhaust pipe 23, and the cleaning pipe 25 are respectively connected to a flow control valve. The staff can adjust the connection relationship between the pipelines according to actual needs.

[0039] It should be noted that the structure of the pipeline conversion member 24 can be adjusted according to actual needs, and no further details are given here.

[0040] In this way, by adjusting the two two-position three-way reversing valves, the cleaning pipe 25 can be connected with each pipe when the first exhaust pipe 21, the second exhaust pipe 22, and the third exhaust pipe 23 are cleaned, thereby reducing the blockage of the first exhaust pipe 21, the second exhaust pipe 22, and the third exhaust pipe 23 due to the accumulation of hydraulic oil, and avoiding affecting the exhaust work of the internal pipeline of the EDP; when the internal pipeline of the EDP is exhausted, the first exhaust pipe 21 is connected with the second exhaust pipe 22 or the third exhaust pipe 23, thereby improving the exhaust efficiency of the internal pipeline of the EDP.

[0041] See also Figure 2 In some embodiments, the pipeline assembly 2 further includes a connecting pipe 26, and both ends of the connecting pipe 26 are respectively connected to the connecting ports on the two two-position three-way reversing valves. In this embodiment, the connecting pipe 26 is a hard pipe.

[0042] It should be noted that the connecting pipe 26 can be made of hard materials such as plastic, and the material of the connecting pipe 26 can be adjusted according to actual needs, which will not be listed in detail here.

[0043] In this way, the two two-position three-way reversing valves are connected through the connecting pipe 26, so that the cleaning pipe 25 and the third exhaust pipe 23 can be connected with the first exhaust pipe 21 and the second exhaust pipe 22 through the connecting pipe 26, so as to achieve the effect of cleaning the internal pipelines of the EDP separately according to actual needs, eliminating the step of configuring pipeline conversion tooling of different specifications according to the pipelines to be exhausted.

[0044] See also Figure 1In some embodiments, the aircraft hydraulic system pipeline exhaust auxiliary device further includes a first storage cabinet 3, which is connected to the device body 1 and is used to store pipes constituting the pipeline.

[0045] In this embodiment, the first storage cabinet 3 is located below the operating cavity 11, and the first storage cabinet 3 is a drawer structure, and the first storage cabinet 3 is slidably connected to the side wall of the device body 1. Further, a plurality of partitions (not shown in the figure) can be provided in the first storage cabinet 3 to store each pipeline separately.

[0046] In this way, the replaced first exhaust pipe 21, second exhaust pipe 22, third exhaust pipe 23, and cleaning pipe 25 can be stored in the first storage cabinet 3, which is convenient for staff to replace and load and unload, saves time for reconfiguring the pipeline, and improves the exhaust efficiency of the internal pipeline of the EDP.

[0047] See also Figure 1 and Figure 4 In some embodiments, the aircraft hydraulic system pipeline exhaust auxiliary device also includes a second storage cabinet 4, a plug (not shown in the figure) and a plug cap (not shown in the figure), and the second storage cabinet 4 is connected to the device body 1 for storing the plug and the plug cap.

[0048] In this embodiment, the second storage cabinet 4 is a drawer structure, and the second storage cabinet 4 is slidably connected to the side of the device body 1 connected to the first storage cabinet 3, and the pipeline conversion component 24, the first storage cabinet 3 and the second storage cabinet 4 are arranged in sequence along the height direction of the device body 1.

[0049] In this way, connecting the plug and the plug cap to the pipeline assembly 2 can prevent the residual liquid in the pipeline from leaking, thereby polluting the surrounding environment, and can prevent external pollutants from entering the pipeline and causing pipeline blockage.

[0050] See also Figure 4 In some embodiments, a carrying platform 41 is provided in the second storage cabinet 4, and a plurality of placement holes 411 are opened on the top surface of the carrying platform 41 for storing plugs and plug caps.

[0051] The shapes of the plurality of placement holes 411 are adapted to the shapes of the plugs or plug caps, and are used to limit the positions of the plugs and plug caps on the support platform 41. Furthermore, holes (not shown in the figure) are provided on the sides of the first storage cabinet 3 and the second storage cabinet 4 facing the outside, so that the staff can move the first storage cabinet 3 and the second storage cabinet 4 easily.

[0052] In this way, the staff can store plugs and caps of different specifications in the second storage cabinet 4 in advance according to actual needs. After disconnecting the pipeline assembly 2 from the internal pipeline of the EDP, the staff can quickly access the plugs and caps in the second storage cabinet 4 to promptly block the ends of each pipeline to avoid liquid leakage in the pipeline and improve the exhaust efficiency of the internal pipeline of the EDP.

[0053] It should be noted that the supporting platform 41 is fixedly connected to the second storage cabinet 4 by gluing, welding, etc., and can also be detachably connected to the second storage cabinet 4 by bolts. The connection method between the supporting platform 41 and the second storage cabinet 4 can be adjusted according to actual needs, which will not be listed in detail here.

[0054] See also Figure 1 and Figure 3 In some embodiments, the top surface of the device body 1 is rotatably connected to a cover 12. In some embodiments, the cover 12 is fixedly connected to a handle 121 on both the side facing the inside of the device body 1 and the side away from the inside of the device body 1.

[0055] In this way, when the cover 12 is closed on the device body 1, the pipeline conversion part 24 can be protected to prevent external pollutants from contacting the pipeline conversion part 24, thereby affecting the normal use of the pipeline conversion part 24. Handles 121 are provided on both sides of the cover 12 to facilitate the staff to turn the cover 12 to open it or close it with the device body 1.

[0056] See also Figure 3 In some embodiments, a handrail 13 is fixedly connected to the side wall of the device body 1, a pipe bracket 14 is fixedly arranged on the side wall of the device body 1, a plurality of universal wheels 15 are arranged on the bottom surface of the device body 1, and a plurality of directional wheels 16 are arranged on the bottom surface of the device body 1.

[0057] In this embodiment, the handrail 13 is arranged on the side wall opposite to the side where the device body 1 is connected to the first storage cabinet 3 and the second storage cabinet 4. The pipe bracket 14 is an L-shaped structure, and two pipe brackets 14 are provided. The two pipe brackets 14 are detachably arranged on the side where the device body 1 is connected to the first exhaust pipe 21 and the side where the device body 1 is connected to the cleaning pipe 25 by bolts; two universal wheels 15 and two directional wheels 16 are respectively provided, and the two universal wheels 15 are arranged on the side where the device body 1 is connected to the handrail 13, and the directional wheels 16 are arranged on the side where the device body 1 is connected to the first storage cabinet 3.

[0058] In this way, the pipe support 14 can support the first exhaust pipe 21, the second exhaust pipe 22, the third exhaust pipe 23 and the cleaning pipe 25, so that they are not easy to fall on the ground and cause inconvenience in operation. When it is necessary to exhaust the internal pipeline of the EDP, the staff can hold the handrail 13 to push the device body 1, so that the device body 1 can be quickly moved to the vicinity of the EDP under the action of the universal wheel 15 and the directional wheel 16.

[0059] It should be noted that the number of pipe supports 14 can be adjusted according to actual needs, and no further enumeration is given here.

[0060] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. An auxiliary device for exhausting pipelines of an aircraft hydraulic system, characterized in that: The invention comprises a device body (1) and a pipeline assembly (2), wherein the pipeline assembly (2) comprises a first exhaust pipe (21), a second exhaust pipe (22), a third exhaust pipe (23) and a pipeline conversion component (24), wherein the first exhaust pipe (21), the second exhaust pipe (22) and the third exhaust pipe (23) are all detachably connected to the device body (1), and the pipeline conversion component (24) is respectively connected to the first exhaust pipe (21), the second exhaust pipe (22) and the third exhaust pipe (23), so as to enable the first exhaust pipe (21) to selectively communicate with the second exhaust pipe (22) or the third exhaust pipe (23).

2. The aircraft hydraulic system pipeline exhaust auxiliary device according to claim 1, characterized in that: The pipeline assembly (2) further comprises a cleaning pipe (25), wherein the cleaning pipe (25) is connected to the pipeline conversion component (24) and is used for cleaning the first exhaust pipe (21), the second exhaust pipe (22) and the third exhaust pipe (23).

3. The aircraft hydraulic system pipeline exhaust auxiliary device according to claim 2, characterized in that: The pipeline conversion component (24) is a two-position three-way reversing valve. Two two-position three-way reversing valves are provided. Both two-position three-way reversing valves are provided on the device body (1). The first exhaust pipe (21) and the second exhaust pipe (22) are respectively connected to two connecting ports on one of the two-position three-way reversing valves. The third exhaust pipe (23) and the cleaning pipe (25) are respectively connected to the two connecting ports on the other two-position three-way reversing valve, and the two two-position three-way reversing valves are connected to each other.

4. The aircraft hydraulic system pipeline exhaust auxiliary device according to claim 3, characterized in that: The pipeline assembly (2) also includes a connecting pipe (26), and two ends of the connecting pipe (26) are respectively connected to the connecting ports on the two two-position three-way reversing valves.

5. The aircraft hydraulic system pipeline exhaust auxiliary device according to any one of claims 1 to 4, characterized in that: The aircraft hydraulic system pipeline exhaust auxiliary device also includes a first storage cabinet (3), which is connected to the device body (1) and is used to store pipes that constitute the pipeline.

6. The aircraft hydraulic system pipeline exhaust auxiliary device according to any one of claims 1 to 4, characterized in that: The aircraft hydraulic system pipeline exhaust auxiliary device also includes a second storage cabinet (4), a plug and a plug cap, wherein the second storage cabinet (4) is connected to the device body (1) and is used to store the plug and the plug cap.

7. The aircraft hydraulic system pipeline exhaust auxiliary device according to claim 6, characterized in that: A bearing platform (41) is arranged in the second storage cabinet (4), and a plurality of placement holes (411) are provided on the top surface of the bearing platform (41) for storing the plug and the plug cap.

8. The aircraft hydraulic system pipeline exhaust auxiliary device according to any one of claims 1 to 4, characterized in that: The top surface of the device body (1) is rotatably connected to a cover (12).

9. The aircraft hydraulic system pipeline exhaust auxiliary device according to claim 8, characterized in that: A handle (121) is fixedly connected to the side of the machine cover (12) facing the inside of the device body (1), and / or a handle (121) is fixedly connected to the side of the machine cover (12) facing away from the inside of the device body (1).

10. The aircraft hydraulic system pipeline exhaust auxiliary device according to any one of claims 1 to 4, characterized in that: The side wall of the device body (1) is fixedly connected to a handrail (13), and / or the side wall of the device body (1) is fixedly provided with a pipe bracket (14), and / or the bottom surface of the device body (1) is provided with a plurality of universal wheels (15), and / or the bottom surface of the device body (1) is provided with a plurality of directional wheels (16).

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