Cover body detection equipment for lower cover plate assembly of instrument panel

Abstract

The utility model relates to a cover body detection device of an instrument board lower cover plate assembly. A cup holder and a storage box are integrated on the instrument board lower cover plate assembly. The cover body detection equipment fixing seat can fix an instrument board lower cover plate assembly in an installation state. And the two distance sensors can respectively correspond to a cup holder on the lower cover plate assembly of the instrument panel and two cover bodies of the storage box. The driving ends of the two first air cylinders correspond to the two cover bodies respectively, and pressure sensors are correspondingly arranged at the driving ends of the two first air cylinders. The two first air cylinders can drive the pressure sensors to horizontally move in the direction facing the corresponding cover bodies so that the pressure sensors can abut against the cover bodies and open and close the cover bodies. Or the two first air cylinders can drive the pressure sensors to horizontally move in the direction away from the corresponding cover bodies so as to avoid the opened cover bodies. The instrument board lower cover plate assembly has the beneficial effects that the instrument board lower cover plate assembly can automatically detect values of opening force, closing force and opening time of a cover body of a cup holder and a storage box, so that the detection efficiency and the detection precision are improved, and related detection data can be conveniently stored.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts detection equipment, in particular to a cover body detection equipment of a lower cover plate assembly of an instrument panel. Background Art

[0002] The cup holder on the dashboard lower cover assembly with integrated cup holder and storage box is a pull-out structure, and the storage box is a flip-over structure. The pull-out cup holder is opened and closed in the following ways: press the cup holder cover, the press-and-pop-up mechanism on the cup holder cover is deformed, the cup holder cover is unlocked and drives the cup holder body to pop out horizontally from the cup holder box body, after pushing and pressing the cup holder cover, the press-and-pop-up mechanism on the cup holder cover is deformed and then restored, the cup holder cover is locked and drives the cup holder body to be inserted and snapped into the cup holder box. The flip-over storage box is opened and closed in the following ways: press the storage box cover, the press-and-flip mechanism on the storage box cover is deformed, the storage box cover is unlocked and drives the storage box body to flip and pop out from the storage box body, after pushing and pressing the storage box cover, the press-and-flip mechanism on the storage box cover is deformed and then restored, the storage box cover is locked and drives the storage box body to flip and insert and snap into the storage box body. During the production stage of the dashboard lower cover assembly, it is necessary to test whether the opening force, closing force and opening time of the cup holder and storage box cover meet the standards. At present, the opening and closing forces of the cover are generally detected by manually operating a push-pull force gauge, and the opening time is timed by a stopwatch. This detection process is time-consuming and labor-intensive, and the detection process has large errors, the detection result accuracy is low, and the detection data cannot be stored quickly and accurately. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a cover body detection device for the lower cover assembly of the instrument panel, which solves the technical problems in the prior art of manually operating a push-pull dynamometer and a stopwatch to detect the opening and closing of the cup holder and the storage box, which is time-consuming and labor-intensive, has low detection accuracy, and is difficult to store data.

[0005] (II) Technical solution

[0006] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0007] The embodiment of the utility model provides a cover body detection device of an instrument panel lower cover assembly, wherein the instrument panel lower cover assembly is integrated with a cup holder and a storage box, and the cover body detection device comprises a fixing seat, two spacing sensors, a cylinder seat, two first cylinders and two pressure sensors;

[0008] The fixing seat is capable of fixing the instrument panel lower cover assembly in an installed state, and the two spacing sensors and the cylinder seat are both located on a first side of the fixing seat;

[0009] The two distance sensors can correspond to the cup holder on the instrument panel lower cover assembly and the two covers of the storage box respectively;

[0010] The fixed ends of the two first cylinders are arranged on the cylinder seat at intervals, the driving ends of the two first cylinders correspond to the two cover bodies respectively, and the driving ends of the two first cylinders are both correspondingly provided with the pressure sensor;

[0011] The two first cylinders can drive the pressure sensor to move horizontally in a direction toward the corresponding cover body so that the pressure sensor is pressed against the cover body and opens and closes the cover body; or, the two first cylinders can drive the pressure sensor to move horizontally in a direction away from the corresponding cover body to avoid the cover body during the opening process.

[0012] According to the utility model, the fixing seat includes a bracket and a receiving box, and the bracket and the receiving box are arranged opposite to each other along the opening direction of the cover body;

[0013] An L-shaped step portion is provided on the top of the bracket, and the step portion is used to support and abut against two vertical side walls of the upper part of the instrument panel lower cover assembly;

[0014] The accommodating box is used to accommodate the lower part of the instrument panel lower cover assembly, and the opposite side walls of the accommodating box are both provided with limit members protruding upwards, and the two limit members are used to abut against the two sides of the lower part of the instrument panel lower cover assembly.

[0015] According to the utility model, the cover body detection device further comprises a second cylinder located on the first side of the fixing seat;

[0016] The driving end of the second cylinder is fixedly connected to the cylinder seat, and the driving end of the second cylinder is used to drive the cylinder seat to move horizontally in a direction toward or away from the cover body;

[0017] When the second cylinder drives the two first cylinders to move horizontally a first distance in the direction toward the cover body through the cylinder seat and the driving ends of the two first cylinders drive the pressure sensors to move horizontally a second distance in the direction toward the cover body, the two pressure sensors can press and open and close the corresponding cover body;

[0018] When the second cylinder drives the two first cylinders to move horizontally a first distance away from the cover body through the cylinder seat and the two first cylinders move horizontally a second distance away from the cover body, the two pressure sensors can avoid the cover body during the opening process.

[0019] According to the utility model, the cover detection device further comprises a sensor bracket located on a first side of the fixing seat;

[0020] The two distance sensors are both arranged on the sensor bracket.

[0021] According to the utility model, the cover body detection device also includes a PLC controller;

[0022] The two spacing sensors, the two first cylinders, the second cylinder and the two pressure sensors are all connected to the PLC controller.

[0023] According to the utility model, the cover detection device also includes a display and a printer;

[0024] The display is connected to the PLC controller and the printer, and the printer is used to print labels with information on the opening force, closing force and opening time of the two cover bodies.

[0025] According to the utility model, the cover detection device further includes a support frame;

[0026] The fixing seat, the sensor bracket, the main body of the second cylinder, the display and the printer are all fixed on the supporting frame.

[0027] According to the utility model, an alarm is arranged on the supporting frame, and a wheel body is arranged at the bottom of the supporting frame.

[0028] (III) Beneficial effects

[0029] The beneficial effect of the utility model is that the detection process of the cover body detection device of the instrument panel lower cover assembly of the utility model is:

[0030] S1: First, fix the instrument panel lower cover assembly in the installed state on the vehicle on the fixing seat to avoid displacement during the detection process.

[0031] S2: The two first cylinders respectively drive the pressure sensors to move horizontally toward the corresponding cover bodies until the pressure sensors press against the corresponding cover bodies. The two cover bodies are opened by the pressing force of the pressure sensors, and the pressure sensors detect the opening force value borne by the cover bodies.

[0032] S3: During the opening process of the two covers, the two first cylinders can drive the pressure sensors to move horizontally away from the corresponding covers to avoid the covers. The two spacing sensors detect the opening time required for the covers to be fully opened through the change in the spacing between the corresponding covers and the spacing sensors.

[0033] S4: When the two covers are opened, the two first cylinders drive the pressure sensors to move horizontally toward the corresponding covers until the pressure sensors press against the corresponding covers. The two covers are closed by the pressing force of the pressure sensors, and the pressure sensors detect the closing force values ​​borne by the covers.

[0034] Therefore, the dashboard lower cover assembly can automatically detect the values ​​of the opening force, closing force and opening time of the cup holder and storage box cover to improve the detection efficiency and detection accuracy, and also facilitate the storage of relevant detection data. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a three-dimensional schematic diagram of the lower cover assembly of the instrument panel of the utility model;

[0036] Figure 2 for Figure 1 main view.

[0037] [Description of Reference Numerals]

[0038] 1: fixing seat; 11: bracket; 111: step portion; 12: receiving box;

[0039] 2: spacing sensor; 21: sensor bracket;

[0040] 3: Cylinder seat;

[0041] 4: First cylinder;

[0042] 5: Pressure sensor;

[0043] 6: Second cylinder;

[0044] 7: Instrument panel lower cover assembly; 71: Cover; 721: Cup holder box body; 722: Cup holder cover; 731: Storage box body; 732: Storage box cover;

[0045] 8: Printer. DETAILED DESCRIPTION

[0046] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below in conjunction with the accompanying drawings through specific implementation methods. Figure 2 The orientation is used as a reference.

[0047] See also Figure 1 and 2 The cover body detection device of the instrument panel lower cover assembly proposed in the embodiment of the utility model has a cup holder and a storage box integrated on the instrument panel lower cover assembly 7 .

[0048] The instrument panel lower cover assembly 7 comprises a cover 71, a cup holder and a storage box. The cup holder and the storage box are both integrated on the cover 71.

[0049] Among them, the cup holder is a pull-out cup holder. The cup holder includes a cup holder box body 721, a cup holder main body and a cup holder cover 722. The cup holder box body 721 is integrated on the cover plate 71, the cup holder main body is inserted in the cup holder box body 721, the cup holder cover 722 is fixed to the end of the cup holder main body, and a press-pop-up mechanism is provided on the cup holder cover 722. The pull-out cup holder is opened in the following manner: the cup holder cover 722 is pressed, the press-pop-up mechanism on the cup holder cover 722 is deformed, the cup holder cover 722 is unlocked and drives the cup holder main body to horizontally pop out from the cup holder box body 721. The pull-out cup holder is closed in the following manner: after pushing and pressing the cup holder cover 722, the press-pop-up mechanism on the cup holder cover 722 is deformed and then restored, the cup holder cover 722 is locked and drives the cup holder main body to be inserted and snapped into the cup holder box.

[0050] The storage box is a flip storage box. The storage box includes a storage box body 731, a storage box main body and a storage box cover 732. The storage box body 731 is integrated on the cover plate 71, the storage box main body is hinged in the storage box body 731, the storage box cover 732 is fixed to the end of the storage box main body, and a pressing and flipping mechanism is provided on the storage box cover 732. The flip storage box is opened in the following manner: the storage box cover 732 is pressed, the pressing and flipping mechanism on the storage box cover 732 is deformed, the storage box cover 732 is unlocked and drives the storage box main body to flip and pop out from the storage box body 731. The flip storage box is closed in the following manner: after pushing and pressing the storage box cover 732, the pressing and flipping mechanism on the storage box cover 732 is deformed and then restored, the storage box cover 732 is locked and drives the storage box main body to flip and insert and be clamped in the storage box body 731.

[0051] It should be noted that the push-to-pop-up structure of the pull-out cup holder and the push-to-flip mechanism of the flip storage box are both existing mechanisms.

[0052] Specifically, the cup holder and the storage box on the instrument panel lower cover assembly 7 in the installed state on the vehicle are arranged from top to bottom.

[0053] Furthermore, the cover body detection device includes a fixing seat 1 , two spacing sensors 2 , a cylinder seat 3 , two first cylinders 4 and two pressure sensors 5 .

[0054] The fixing base 1 can fix the lower instrument panel cover assembly 7 in the installed state, and the two spacing sensors 2 and the cylinder base 3 are both located on the first side of the fixing base 1. The two spacing sensors 2 can correspond to the cup holder and the two covers of the storage box on the lower instrument panel cover assembly 7 respectively. The fixing ends of the two first cylinders 4 are spaced apart on the cylinder base 3, and the driving ends of the two first cylinders 4 correspond to the two covers respectively, and the driving ends of the two first cylinders 4 are both correspondingly provided with pressure sensors 5.

[0055] The two first cylinders 4 can drive the pressure sensor 5 to move horizontally in the direction toward the corresponding cover body so that the pressure sensor 5 is pressed against the cover body and opens and closes the cover body; or, the two first cylinders 4 can drive the pressure sensor 5 to move horizontally in the direction away from the corresponding cover body to avoid the cover body during the opening process.

[0056] Furthermore, the detection process of the cover body detection device of the lower cover assembly of the instrument panel is as follows:

[0057] S1: First, fix the instrument panel lower cover assembly 7 in the installed state on the vehicle on the fixing seat 1 to avoid displacement during the detection process.

[0058] S2: The two first cylinders 4 respectively drive the pressure sensors 5 to move horizontally toward the corresponding cover bodies until the pressure sensors 5 press against the corresponding cover bodies. The two cover bodies are opened by the pressing force of the pressure sensors 5, and the pressure sensors 5 detect the opening force value borne by the cover bodies.

[0059] S3: During the opening process of the two covers, the two first cylinders 4 can drive the pressure sensor 5 to move horizontally away from the corresponding cover to avoid the cover. The two spacing sensors 2 detect the opening time required for the cover to be fully opened through the change in the spacing between the corresponding cover and the spacing sensor 2.

[0060] S4: When the two covers are opened, the two first cylinders 4 drive the pressure sensors 5 to move horizontally toward the corresponding covers until the pressure sensors 5 press against the corresponding covers. The two covers are closed by the pressing force of the pressure sensors 5, and the pressure sensors 5 detect the closing force value borne by the covers.

[0061] Therefore, the cover detection device can automatically detect the values ​​of the opening force, closing force and opening time of the cover of the cup holder and the storage box to improve the detection efficiency and detection accuracy, and also facilitate the storage of relevant detection data.

[0062] It should be noted that when the cup holder cover 722 and the storage box cover 732 require different opening and closing pressing forces, the two first cylinders 4 drive the pressure sensor 5 to move at different strokes to provide different pressing forces to the corresponding cover bodies.

[0063] Furthermore, the fixing base 1 includes a bracket 11 and a receiving box 12, and the bracket 11 and the receiving box 12 are arranged opposite to each other along the opening direction of the cover.

[0064] An L-shaped step 111 is provided at the top of the bracket 11, and the step 111 is used to support and abut against the two vertical side walls of the upper part of the instrument panel lower cover assembly 7. The storage box 12 is used to accommodate the lower part of the instrument panel lower cover assembly 7, and the opposite side walls of the storage box 12 are both protruding upward to be provided with stoppers (not shown), and the two stoppers are used to abut against the two sides of the lower part of the instrument panel lower cover assembly 7.

[0065] Thus, the bracket 11 and the receiving box 12 can fix the lower instrument panel cover assembly 7 on both sides along the opening direction of the cover body, thereby preventing the lower instrument panel cover assembly 7 from shifting during detection.

[0066] Specifically, the cup holder box 721 of the instrument panel lower cover assembly 7 supports and abuts against the step portion 111 of the bracket 11. The receiving box 12 is a slot structure with an upper opening, and the lower portion of the instrument panel lower cover assembly 7 can be inserted into the receiving box 12.

[0067] Furthermore, the cover body detection device also includes a second cylinder 6 located on the first side of the fixing seat 1 .

[0068] The driving end of the second cylinder 6 is fixedly connected to the cylinder base 3, and the driving end of the second cylinder 6 is used to drive the cylinder base 3 to move horizontally in a direction toward or away from the cover body.

[0069] When the second cylinder 6 drives the two first cylinders 4 to move horizontally a first distance in the direction toward the cover body through the cylinder seat 3 and the driving ends of the two first cylinders 4 drive the pressure sensors 5 to move horizontally a second distance in the direction toward the cover body, the two pressure sensors 5 can press and open and close the corresponding cover body;

[0070] When the second cylinder 6 drives the two first cylinders 4 to move horizontally a first distance away from the cover body through the cylinder base 3 and the two first cylinders 4 move horizontally a second distance away from the cover body, the two pressure sensors 5 can avoid the cover body during the opening process.

[0071] Among them, the two first cylinders 4 are used to drive the pressure sensors 5 to press the corresponding cover body, and the driving stroke is limited, while the second cylinder 6 can extend the overall moving stroke of the first cylinder 4, so as to drive the first cylinder 4 away from the fixing seat 1 in the initial stage, so as to facilitate the fixation of the lower cover assembly 7 of the instrument panel, and can drive the first cylinder 4 away from the lower cover assembly 7 of the instrument panel during the opening process of the cover body, so as to avoid the cover body during the opening process.

[0072] It should be noted that when the opening and closing pressing forces of the support cover 722 and the storage box cover 732 are different, the driving strokes of the driving ends of the two first cylinders 4 are different, that is, the second distances that the driving ends of the two first cylinders 4 drive the pressure sensor 5 to move horizontally are different.

[0073] Furthermore, the cover detection device further comprises a sensor bracket 21 located at a first side of the fixing base 1. Two spacing sensors 2 are both arranged on the sensor bracket 21 to correspond to the two covers respectively and detect the opening time of the corresponding covers.

[0074] Preferably, the distance sensor 2 is an infrared distance measuring sensor, which is used to emit infrared rays to the cover to obtain the distance between the distance sensor 2 and the corresponding cover, and detect the opening time of the cover being fully opened through the change of the distance.

[0075] Specifically, two spacing sensors 2 are arranged on the sensor bracket 21 from top to bottom to correspond to the cup holder cover 722 and the storage box cover 732 on the instrument panel lower cover assembly 7 respectively.

[0076] Furthermore, the cover body detection device also includes a PLC controller.

[0077] The two distance sensors 2, the two first cylinders 4, the second cylinder 6 and the two pressure sensors 5 are all connected to the PLC controller.

[0078] Among them, the pressure sensor 5 is used to transmit the opening force value and closing force value of pressing the cover body to the PLC controller. The spacing sensor 2 is used to transmit the spacing data between the spacing sensor 2 and the corresponding cover body to the PLC controller, and the PLC controller receives the opening time of the cover body fully opened. The PLC controller can receive and store the data of the opening force value, closing force value and opening time of the cover body, and compare each data with the standard value to determine whether the cover body is qualified. The PLC controller can also control the opening and closing and driving direction of the first cylinder 4 and the second cylinder 6, and when the PLC controller receives the spacing data sent by the spacing sensor 2 to be reduced, it determines that the cover body is open, and controls the driving ends of the first cylinder 4 and the second cylinder 6 to move in the direction away from the cover body to avoid the cover body during the opening process.

[0079] Therefore, the cover body detection equipment can automatically obtain the information of the opening force, closing force and opening time of the cover body and automatically determine whether the cover body is qualified. Its detection accuracy and efficiency are high, ensuring the production quality of the lower cover assembly 7 of the dashboard.

[0080] Preferably, the cover body detection device further comprises a button, which is connected to a PLC controller. When the button is pressed, the PLC controller can control the cover body detection device to perform detection, so as to facilitate operation.

[0081] Preferably, the cover body detection device further includes a display and a printer 8 .

[0082] The display is connected to the PLC controller and the printer 8. The display is used to receive the data of the opening force value, closing force value and opening time of the cover body transmitted by the PLC controller and display the data of the opening force value, closing force value and opening time of the cover body, and transmit the data of the opening force value, closing force value and opening time of the cover body to the printer 8, and the printer 8 is used to print a label printed with the information of the opening force, closing force and opening time of the two cover bodies.

[0083] When the opening force, closing force and opening time of the two covers of the lower instrument panel cover assembly 7 are qualified, the printer 8 can print a label with information of the opening force, closing force and opening time of the two covers, and the label can be pasted on the lower instrument panel cover assembly 7 to facilitate subsequent traceability of the product.

[0084] Furthermore, the cover detection device also includes a supporting frame.

[0085] The fixing base 1, the sensor bracket 21, the main body of the second cylinder 6, the display and the printer 8 are all fixed on the supporting frame, and the supporting frame is used to support the cover body detection device as a whole.

[0086] Preferably, an alarm is arranged on the support frame to sound an alarm when the cover is detected to be unqualified. A wheel body is arranged at the bottom of the support frame to facilitate changing the position of the cover detection device.

[0087] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0088] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A cover body detection device for an instrument panel lower cover assembly, wherein the instrument panel lower cover assembly (7) is integrated with a cup holder and a storage box, characterized in that: The cover body detection device comprises a fixing seat (1), two spacing sensors (2), a cylinder seat (3), two first cylinders (4) and two pressure sensors (5); The fixing seat (1) is capable of fixing the instrument panel lower cover assembly (7) in an installed state, and the two spacing sensors (2) and the cylinder seat (3) are both located on a first side of the fixing seat (1); The two distance sensors (2) can respectively correspond to the cup holder on the instrument panel lower cover assembly (7) and the two covers of the storage box; The fixed ends of the two first cylinders (4) are arranged at intervals on the cylinder seat (3), the driving ends of the two first cylinders (4) correspond to the two cover bodies respectively, and the driving ends of the two first cylinders (4) are both correspondingly provided with the pressure sensor (5); The two first air cylinders (4) can drive the pressure sensor (5) to move horizontally in a direction toward the corresponding cover body so that the pressure sensor (5) is pressed against the cover body and opens and closes the cover body; or, the two first air cylinders (4) can drive the pressure sensor (5) to move horizontally in a direction away from the corresponding cover body so as to avoid the cover body during the opening process.

2. The instrument panel lower cover assembly cover detection device as claimed in claim 1, characterized in that: The fixing seat (1) comprises a bracket (11) and a receiving box (12), wherein the bracket (11) and the receiving box (12) are arranged opposite to each other along the opening direction of the cover body; An L-shaped stepped portion (111) is provided at the top of the bracket (11), and the stepped portion (111) is used to support and abut against two vertical side walls of the upper portion of the instrument panel lower cover assembly (7); The accommodating box (12) is used to accommodate the lower part of the instrument panel lower cover assembly (7), and the opposite side walls of the accommodating box (12) are both provided with stoppers protruding upwards, and the two stoppers are used to abut against the two sides of the lower part of the instrument panel lower cover assembly (7).

3. The instrument panel lower cover assembly cover detection device as claimed in claim 1, characterized in that: The cover body detection device further comprises a second cylinder (6) located on a first side of the fixing seat (1); The driving end of the second cylinder (6) is fixedly connected to the cylinder seat (3), and the driving end of the second cylinder (6) is used to drive the cylinder seat (3) to move horizontally in a direction toward or away from the cover body; When the second cylinder (6) drives the two first cylinders (4) to move horizontally a first distance in the direction toward the cover body through the cylinder seat (3), and the driving ends of the two first cylinders (4) drive the pressure sensors (5) to move horizontally a second distance in the direction toward the cover body, the two pressure sensors (5) can press and open and close the corresponding cover body; When the second cylinder (6) drives the two first cylinders (4) to move horizontally a first distance in a direction away from the cover body through the cylinder seat (3) and the two first cylinders (4) move horizontally a second distance in a direction away from the cover body, the two pressure sensors (5) can avoid the cover body during the opening process.

4. The instrument panel lower cover assembly cover detection device as claimed in claim 3, characterized in that: The cover detection device further comprises a sensor bracket (21) located on a first side of the fixing base (1); The two distance sensors (2) are both arranged on the sensor bracket (21).

5. The instrument panel lower cover assembly cover detection device as claimed in claim 4, characterized in that: The cover body detection device also includes a PLC controller; The two distance sensors (2), the two first cylinders (4), the second cylinder (6) and the two pressure sensors (5) are all connected to the PLC controller.

6. The instrument panel lower cover assembly cover detection device as claimed in claim 5, characterized in that: The cover body detection device also includes a display and a printer (8); The display is connected to the PLC controller and the printer (8), and the printer (8) is used to print labels with information on the opening force, closing force and opening time of the two cover bodies.

7. The instrument panel lower cover assembly cover detection device as claimed in claim 6, characterized in that: The cover detection device also includes a support frame; The fixing seat (1), the sensor bracket (21), the main body of the second cylinder (6), the display and the printer (8) are all fixed on the supporting frame.

8. The instrument panel lower cover assembly cover detection device as claimed in claim 7, characterized in that: An alarm is arranged on the supporting frame, and a wheel body is arranged at the bottom of the supporting frame.

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