Airbag ignition test device

Abstract

The utility model relates to a safety air bag explosion test device. The safety air bag explosion test device comprises an explosion device main body frame, an instrument panel unit, a windshield glass unit, a central control display screen unit and a data acquisition unit, the instrument panel unit, the windshield glass unit and the central control display screen unit are fixedly connected to the main body frame of the ignition device; the data acquisition unit comprises a first acquisition module and a second acquisition module. According to the safety air bag explosion testing device, impact data at the position of the windshield glass unit and the position of the central control display screen unit during explosion of the safety air bag are collected through the first collection module arranged on the windshield glass unit and the second collection module arranged on the central control display screen unit respectively, and theoretical support is provided for cabin design of a real vehicle; the vehicle geometric environment can be adjusted, matched and verified in the vehicle modeling design stage, the later development failure risk is reduced, and the development period is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile safety testing, in particular to a safety airbag point explosion testing device. BACKGROUND

[0002] With the rapid development of the automobile industry, the global automobile ownership is rising. With the change of market demand, people have higher and higher requirements for automobile styling. The interior styling of automobile cabin is becoming more and more novel and peculiar. The automobile instrument panel, windshield and other parts are rapidly developing to meet new demands. The center display screen is also getting larger, and the arrangement of the front airbag of the co-pilot is more challenging. At present, the existing test device lacks the function of real-time monitoring of the impact force caused by the internal components during the unfolding of the airbag, and it is difficult to provide data support for the optimization of the automobile cabin. CONTENT OF THE UTILITY MODEL

[0003] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a safety airbag point explosion testing device.

[0004] In a first aspect, the present application provides a safety airbag point explosion testing device, which comprises a point explosion device main frame, an instrument panel unit, a windshield unit, a center display screen unit and a data acquisition unit.

[0005] The instrument panel unit, the windshield unit and the center display screen unit are fixedly connected to the point explosion device main frame.

[0006] The data acquisition unit comprises a first acquisition module and a second acquisition module. The first acquisition module is arranged on the windshield unit and is used to acquire impact data at the windshield unit when the safety airbag explodes. The second acquisition module is arranged on the center display screen unit and is used to acquire impact data at the center display screen unit when the safety airbag explodes.

[0007] Optionally, the instrument panel unit comprises an instrument panel platform, a safety airbag accommodating cavity, a support platform, an angle adjusting structure, an instrument panel unit stabilizing rod and a first connecting structure.

[0008] The support platform is connected to the point explosion device main frame through the first connecting structure.

[0009] The instrument panel platform is fixed to the support platform through the angle adjusting structure.

[0010] The safety airbag accommodating cavity is arranged in the instrument panel platform.

[0011] The instrument panel unit stabilizing rod is used to support the support platform.

[0012] Optionally, the first connecting structure comprises a lifting rod and a height adjusting motor.

[0013] The lifting rod is fixed to the point explosion device main frame, and the height adjusting motor is used to drive the support platform to move up and down on the lifting rod.

[0014] Optionally, the windshield glass unit comprises a windshield glass, a second connecting structure and a windshield glass fixing module.

[0015] The second connecting structure connects the point explosion device main frame.

[0016] The windshield glass fixing module fixes the windshield glass to the second connecting structure.

[0017] The first collecting module is arranged in the middle area of the windshield glass away from the airbag side.

[0018] Optionally, the second connecting structure comprises a windshield glass lower rotating mechanism, a windshield glass angle adjusting mechanism and a windshield glass angle locking mechanism; wherein the upper end of the windshield glass is connected with the windshield glass angle adjusting mechanism, the lower end of the windshield glass is connected with the windshield glass lower rotating mechanism, and the windshield glass angle locking mechanism is used to lock the windshield glass lower rotating mechanism and the windshield glass angle adjusting mechanism.

[0019] Optionally, the first collecting module is a pressure sensor.

[0020] Optionally, the central control display screen unit comprises a third connecting structure and a central control display screen.

[0021] The central control display screen is connected with the point explosion device main frame through the third connecting structure.

[0022] The second collecting module is fixed to the back of the central control display screen.

[0023] Optionally, the third connecting structure comprises a central control display screen front and rear adjusting mechanism, a central control display screen height adjusting mechanism, a central control display screen lateral adjusting mechanism and a central control display screen locking mechanism.

[0024] The central control display screen front and rear adjusting mechanism connects the point explosion device main frame; the central control display screen lateral adjusting mechanism connects the central control display screen front and rear adjusting mechanism; the central control display screen height adjusting mechanism connects the central control display screen lateral adjusting mechanism; the central control display screen is fixed to the central control display screen height adjusting mechanism; and the central control display screen locking mechanism is used to lock the central control display screen front and rear adjusting mechanism, the central control display screen height adjusting mechanism and the central control display screen lateral adjusting mechanism.

[0025] Optionally, the second acquisition module comprises four pressure sensors, which are uniformly distributed to the back of the central control display screen.

[0026] Optionally, the point explosion device main frame comprises a vertical rod, a bottom horizontal rod, a windshield fixed rod, a stabilizing rod, a universal wheel and a bottom support block.

[0027] The vertical rod is arranged between the bottom horizontal rod and the windshield fixed rod; the stabilizing rod is connected to the vertical rod and the windshield fixed rod respectively.

[0028] The universal wheel is arranged at four corner regions below the bottom horizontal rod; the bottom support block is arranged at four corner regions below the bottom horizontal rod; the number of the bottom support block is the same as that of the universal wheel.

[0029] The beneficial effects of the present application are as follows:

[0030] The airbag point explosion testing device provided by the embodiment of the present application comprises a point explosion device main frame, an instrument panel unit, a windshield unit, a central control display screen unit and a data acquisition unit; the instrument panel unit, the windshield unit and the central control display screen unit are fixedly connected to the point explosion device main frame; the data acquisition unit comprises a first acquisition module and a second acquisition module; wherein the first acquisition module is arranged at the windshield unit and is used for acquiring impact data at the windshield unit when the airbag explodes; the second acquisition module is arranged at the central control display screen unit and is used for acquiring impact data at the central control display screen unit when the airbag explodes. The airbag point explosion testing device acquires impact data at the windshield unit and the central control display screen unit when the airbag explodes through the first acquisition module arranged at the windshield unit and the second acquisition module arranged at the central control display screen unit, thereby providing theoretical support for the design of the real vehicle cabin, adjusting and matching the vehicle geometric environment in the vehicle modeling design stage, reducing the risk of late development failure and shortening the development cycle. BRIEF DESCRIPTION OF DRAWINGS

[0031] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application.

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without creative labor.

[0033] Figure 1A structural schematic diagram of a safety airbag point explosion testing device provided for an embodiment of the present application;

[0034] Figure 2 A structural schematic diagram of a point explosion device main frame provided for an embodiment of the present application;

[0035] Figure 3 A structural schematic diagram of an instrument panel unit provided for an embodiment of the present application;

[0036] Figure 4 A partial structural schematic diagram of a windshield glass unit provided for an embodiment of the present application;

[0037] Figure 5 A partial structural schematic diagram of a windshield glass unit provided for an embodiment of the present application;

[0038] Figure 6 A structural schematic diagram of a central control display screen unit provided for an embodiment of the present application.

[0039] The reference signs are as follows:

[0040] 100 - point explosion device main frame; 200 - instrument panel unit; 300 - windshield glass unit; 400 - central control display screen unit; 500 - data acquisition unit;

[0041] 101 - vertical rod; 102 - bottom horizontal rod; 103 - windshield glass fixing rod; 104 - stabilizing rod; 105 - universal wheel; 106 - bottom support block;

[0042] 201 - instrument panel platform; 202 - safety airbag accommodating cavity; 203 - support platform; 204 - angle adjusting structure; 205 - instrument panel unit stabilizing rod; 206 - lifting rod; 207 - height adjusting motor;

[0043] 301 - windshield glass fixing module; 302 - windshield glass; 303 - first acquisition module; 304 - windshield glass lower part rotating mechanism; 305 - windshield glass angle adjusting mechanism; 306 - windshield glass angle locking mechanism;

[0044] 401 - central control display screen front and back adjusting mechanism; 402 - central control display screen height adjusting mechanism; 403 - central control display screen transverse adjusting mechanism; 404 - central control display screen locking mechanism; 405 - second acquisition module; 406 - central control display screen. DETAILED DESCRIPTION

[0045] The present application will be described in detail with reference to the drawings and preferred embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure herein. The present application can also be implemented or applied by other different specific embodiments, and various modifications or changes can be made to the details in the specification based on different views and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, but not for limiting the protection scope of the present application.

[0046] The first embodiment of the present application provides a kind of air bag point explosion test device, such as Figure 1 , air bag point explosion test device includes: point explosion device main frame 100, instrument panel unit 200, windshield unit 300, central control display screen unit 400 and data acquisition unit 500. Among them, instrument panel unit 200, windshield unit 300 and central control display screen unit 400 are fixedly connected in point explosion device main frame 100.

[0047] Specifically, data acquisition unit 500 includes first acquisition module 303 and second acquisition module 405. Among them, first acquisition module 303 is arranged in windshield unit 300, for collecting impact data at windshield unit 300 when air bag point explosion, second acquisition module 405 is arranged in central control display screen unit 400, for collecting impact data at central control display screen unit 400 when air bag point explosion, the air bag for testing can be co-driver air bag. Of course, data acquisition unit 500 can also include connection wire harness, data analyzer etc., to collect and analyze the collected data.

[0048] Point explosion device main frame 100 is used for installing and supporting instrument panel unit 200, windshield unit 300 and central control display screen unit 400, the air bag point explosion test device, by first acquisition module 303 arranged in windshield unit and second acquisition module 405 arranged in central control display screen unit, respectively, impact data at windshield unit and central control display screen unit when air bag point explosion is collected, to provide theoretical support for real vehicle cabin design, can adjust matching verification to vehicle geometric environment in vehicle modeling design stage, reduce the risk of late development failure, shorten development cycle.

[0049] In one embodiment, the structural diagram of point explosion device main frame 100 is as shown in Figure 2 , including: vertical rod 101, bottom cross bar 102, windshield fixed rod 103, stabilizing rod 104, universal wheel 105 and bottom support block 106.

[0050] The vertical rod 101 is arranged between the bottom horizontal rod 102 and the windshield glass fixing rod 103, the stabilizing rod 104 is connected with the vertical rod 101 and the windshield glass fixing rod 103 respectively, the universal wheel 105 is arranged at four corner regions below the bottom horizontal rod 102, and the bottom supporting block 106 is arranged at four corner regions below the bottom horizontal rod 102, and the number of the bottom supporting block 106 is same as that of the universal wheel 105.

[0051] In the embodiment, the main body of the point explosion device main frame can adopt high-strength steel, each fixed structure such as the vertical rod 101 can be welded and connected between the bottom horizontal rod 102 and the windshield glass fixing rod 103, the stabilizing rod 104 is connected with the vertical rod 101 and the windshield glass fixing rod 103 respectively, and plays a reinforcing role on the windshield glass fixing rod 103, and the connection mode is not limited, and welding can also be performed. The bottom of the point explosion device main frame can be provided with lockable universal wheels 105, such as one universal wheel 105 that can be arbitrarily rotated is arranged at each of four corner regions of the bottom horizontal rod 102, so that the movement of the airbag point explosion test device is facilitated, and the flexibility is high. When the point explosion test is performed, the universal wheels 105 can be suspended by adjusting the extension of the bottom supporting block 106, so that the fixing of the airbag point explosion test device is realized.

[0052] In one embodiment, a structural schematic diagram of the instrument panel unit 200 is as shown in Figure 3 , which comprises an instrument panel platform 201, an airbag accommodating cavity 202, a supporting platform 203, an angle adjusting structure 204, an instrument panel unit stabilizing rod 205 and a first connecting structure.

[0053] The supporting platform 203 is connected with the point explosion device main frame 100 through the first connecting structure, the instrument panel platform 201 is fixed to the supporting platform 203 through the angle adjusting structure 204, the airbag accommodating cavity 202 is arranged on the instrument panel platform 201, and the instrument panel unit stabilizing rod 205 is used for supporting the supporting platform 203.

[0054] In the embodiment, the instrument panel platform 201 can rotate under the adjustment of the angle adjusting structure 204, and different angles of the instrument panel platform 201 can be simulated in the point explosion test. When the point explosion test is performed, the airbag is arranged in the airbag accommodating cavity 202 of the instrument panel platform 201, so as to improve the stability of the supporting platform 203, and the supporting platform 203 is reinforced and supported through the instrument panel unit stabilizing rod 205.

[0055] In one embodiment, the first connecting structure comprises a lifting rod 206 and a height adjusting motor 207. The lifting rod 206 is fixed to the point explosion device main frame 100, and the height adjusting motor 207 is used for driving the supporting platform 203 to move up and down on the lifting rod 206.

[0056] In this embodiment, the first connecting structure includes a lifting rod 206 and a height adjusting motor 207, so that the height of the support platform 203 can be adjusted up and down. When the point explosion test is performed, the vertical distance between the airbag and the windshield glass can be adjusted by the height adjusting motor 207 driving the lifting rod 206 according to the geometric parameters to be verified as needed; the point explosion angle of the airbag is adjusted by the angle adjusting structure 204, and can be confirmed by the scale line on the device. After the above adjustment is in place, it is locked, thereby realizing the up and down height adjustment of the instrument panel platform 201. Cooperating with the angle adjusting structure 204, the height and angle of the instrument panel platform 201 relative to the airbag are arbitrarily adjusted, any vehicle model with the instrument panel platform 201 in different three-dimensional positions is adapted, and the cost of customized development is reduced.

[0057] In one embodiment, a partial structure diagram of the windshield glass unit 300 is as shown in Figure 4 which includes: a windshield glass 302, a second connecting structure, and a windshield glass fixing module 301.

[0058] In this embodiment, the second connecting structure connects the point explosion device main frame 100, the windshield glass fixing module 301 fixes the windshield glass 302 on the second connecting structure, and the first acquisition module 303 is arranged in the middle region of the side of the windshield glass 302 away from the airbag.

[0059] Specifically, the windshield glass fixing module 301 can include a plurality of windshield glass clamping mechanisms, for example, the windshield glass 302 is fixed by 6 windshield glass clamping mechanisms. The first acquisition module 303 can be a pressure sensor, which can be selected in a circular structure, such as a diameter of 100 mm or more, without limitation. It can be fixed on the back of the windshield glass 302 by bolts. The fixed position can be the central region in contact with the windshield glass 302 when the airbag is deployed. The back here refers to the side of the windshield glass 302 away from the airbag, which can avoid the case that the airbag directly impacts the pressure sensor during the point explosion test, thereby improving the service life of the pressure sensor. The airbag will impact the windshield glass 302 when it is deployed, and the pressure sensor can monitor the impact force of the airbag in the X-Y-Z three directions during the deployment process, and transmit the data to the data analyzer. The data analyzer can calculate the impact force on the windshield glass, thereby evaluating the risk of breaking the windshield glass and guiding the design of the windshield glass.

[0060] In one embodiment, a partial structure diagram of the windshield glass unit 300 is as shown in Figure 5 wherein the second connecting structure includes a windshield glass lower rotating mechanism 304, a windshield glass angle adjusting mechanism 305, and a windshield glass angle locking mechanism 306.

[0061] In this embodiment, the upper end of the windshield 302 is connected with the windshield angle adjusting mechanism 305, and the lower end of the windshield 302 is connected with the windshield lower rotating mechanism 304, that is, the upper and lower ends of the windshield 302 are both connected with the movable mechanism, so that the angle of the windshield 302 is adjustable. During the test, the angle between the windshield 302 and the airbag can be adjusted by rotating the windshield angle adjusting mechanism 305 and the windshield lower rotating mechanism 304, and the windshield angle locking mechanism 306 is used for locking.

[0062] In one embodiment, a structural schematic diagram of the central control display screen unit 400 is as shown in Figure 6 , which comprises a third connecting structure and a central control display screen 406. The third connecting structure comprises a central control display screen front and rear adjusting mechanism 401, a central control display screen height adjusting mechanism 402, a central control display screen transverse adjusting mechanism 403, and a central control display screen locking mechanism 404.

[0063] The central control display screen 406 is connected with the main frame 100 of the point explosion device through the third connecting structure, and the second acquisition module 405 is fixed to the back of the central control display screen 406. The central control display screen front and rear adjusting mechanism 401 is connected with the main frame 100 of the point explosion device, the central control display screen transverse adjusting mechanism 403 is connected with the central control display screen front and rear adjusting mechanism 401, the central control display screen height adjusting mechanism 402 is connected with the central control display screen transverse adjusting mechanism 403, the central control display screen 406 is fixed to the central control display screen height adjusting mechanism 402, and the central control display screen locking mechanism 404 is used for locking the central control display screen front and rear adjusting mechanism 401, the central control display screen height adjusting mechanism 402, and the central control display screen transverse adjusting mechanism 403.

[0064] In this embodiment, the position of the central control display screen 406 relative to the airbag can be adjusted by the central control display screen front and rear adjusting mechanism 401, the central control display screen height adjusting mechanism 402, and the central control display screen transverse adjusting mechanism 403, such as adjusting the front and rear, up and down, and left and right positions. The position of the central control display screen can be adjusted according to the need for verification, and the central control display screen locking mechanism 404 is used for locking after the adjustment is completed.

[0065] In one embodiment, the second acquisition module 405 comprises four pressure sensors, which are uniformly distributed to the back of the central control display screen 406.

[0066] In this embodiment, the second acquisition module 405 can include four pressure sensors, such as four circular structure pressure sensors, which can be 20 mm or 10 mm in diameter, and can be fixed on the back of the center control display screen 406 by bolts or by adhesion, without limitation. The fixed position is the contact area of the airbag deployment and the center control display screen 406. The sensor can monitor the impact force of the center control display screen 406 in the X-Y-Z three directions during the airbag deployment. The impact force on the center control display screen can be calculated by the data analyzer, and the impact force information can be used to evaluate whether the fixing structure of the center control display screen is firm and whether it will break and fly out.

[0067] In the above embodiments of the present application, the airbag point explosion test device can adjust and match the vehicle geometric environment during the vehicle modeling design stage, reduce the failure risk in the later development, shorten the development cycle, and support multi-degree-of-freedom adjustment during verification, such as supporting three-dimensional adjustment of the relative positions of the windshield angle and height, the instrument panel height and angle, the center control display screen, and the airbag, which can be adapted to any vehicle model, reduce the customized development cost, and through the pressure sensors mounted on the windshield and the center control display screen, the impact force data of the surrounding components during the airbag deployment can be collected in real time, and data support can be provided for the design optimization of the surrounding components.

[0068] In the embodiments provided in the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, and the division of the modules is only a logical function division, and actual implementation can have another division manner, for example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed units can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0069] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place or distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0070] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0071] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of the embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk or an optical disk, and various program code storage media.

[0072] It should be noted that, in this document, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0073] The above embodiments are only preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Any equivalent replacement or transformation of the present application made by those skilled in the art based on the present application is within the protection scope of the present application.

Claims

1. An airbag burst test apparatus characterized by comprising: The airbag point explosion testing device comprises a point explosion device main frame, an instrument panel unit, a windshield glass unit, a central control display screen unit and a data acquisition unit; The instrument panel unit, the windshield glass unit and the central control display screen unit are fixedly connected to the point explosion device main frame; The data acquisition unit comprises a first acquisition module and a second acquisition module; the first acquisition module is arranged on the windshield glass unit and is used for acquiring impact data at the windshield glass unit when the airbag explodes; and the second acquisition module is arranged on the central control display screen unit and is used for acquiring impact data at the central control display screen unit when the airbag explodes.

2. The airbag burst test apparatus according to claim 1, characterized by The instrument panel unit comprises an instrument panel platform, an airbag accommodating cavity, a support platform, an angle adjusting structure, an instrument panel unit stabilizing rod and a first connecting structure; The support platform is connected to the point explosion device main frame through the first connecting structure; The instrument panel platform is fixed to the support platform through the angle adjusting structure; The airbag accommodating cavity is arranged in the instrument panel platform; The instrument panel unit stabilizing rod is used for supporting the support platform.

3. The airbag burst test apparatus according to claim 2, wherein The first connecting structure comprises a lifting rod and a height adjusting motor; The lifting rod is fixed to the point explosion device main frame, and the height adjusting motor is used for driving the support platform to move up and down on the lifting rod.

4. The airbag burst test apparatus of claim 1, wherein The windshield glass unit comprises a windshield glass, a second connecting structure and a windshield glass fixing module; The second connecting structure is connected to the point explosion device main frame; The windshield glass fixing module fixes the windshield glass to the second connecting structure; The first acquisition module is arranged at the middle region of the windshield glass away from the airbag.

5. The airbag burst test apparatus according to claim 4, wherein The second connecting structure comprises a windshield glass lower rotating mechanism, a windshield glass angle adjusting mechanism and a windshield glass angle locking mechanism; the upper end of the windshield glass is connected to the windshield glass angle adjusting mechanism, the lower end of the windshield glass is connected to the windshield glass lower rotating mechanism, and the windshield glass angle locking mechanism is used for locking the windshield glass lower rotating mechanism and the windshield glass angle adjusting mechanism.

6. The airbag burst test apparatus according to claim 4, wherein The first acquisition module is a pressure sensor.

7. The airbag burst test apparatus of claim 1, wherein The central control display screen unit comprises a third connecting structure and a central control display screen; The central control display screen is connected to the point explosion device main frame through the third connecting structure; The second acquisition module is fixed to the back of the central control display screen.

8. The airbag burst test apparatus according to claim 7, wherein The third connecting structure comprises a central control display screen front and back adjusting mechanism, a central control display screen height adjusting mechanism, a central control display screen lateral adjusting mechanism and a central control display screen locking mechanism; The central control display screen front and back adjusting mechanism is connected to the point explosion device main frame; the central control display screen lateral adjusting mechanism is connected to the central control display screen front and back adjusting mechanism; the central control display screen height adjusting mechanism is connected to the central control display screen lateral adjusting mechanism; the central control display screen is fixed to the central control display screen height adjusting mechanism; and the central control display screen locking mechanism is used for locking the central control display screen front and back adjusting mechanism, the central control display screen height adjusting mechanism and the central control display screen lateral adjusting mechanism.

9. The airbag burst test apparatus of claim 7, wherein The second acquisition module comprises four pressure sensors which are uniformly distributed to the back of the central control display screen.

10. The airbag burst test apparatus of claim 1, wherein The point explosion device main frame comprises a vertical pole, a bottom horizontal pole, a windshield glass fixing pole, a stabilizing pole, universal wheels and bottom supporting blocks. The vertical pole is arranged between the bottom horizontal pole and the windshield glass fixing pole. The stabilizing pole is connected to the vertical pole and the windshield glass fixing pole respectively. The universal wheels are arranged at four corner regions below the bottom horizontal pole. The bottom supporting blocks are arranged at four corner regions below the bottom horizontal pole. The number of the bottom supporting blocks is the same as that of the universal wheels.

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