Intelligent scribing trolley combined with unmanned aerial vehicle planning

Abstract

The invention relates to the technical field of engineering equipment, and discloses an intelligent marking trolley combined with unmanned aerial vehicle planning, the intelligent marking trolley comprises an AGV trolley and an aerial photography unmanned aerial vehicle, the front face of the AGV trolley is provided with a cleaning assembly, the top of the AGV trolley is provided with a storage assembly, and the outside of the AGV trolley is provided with a marking assembly. The cleaning assembly comprises a first electric push rod fixedly connected to the front face of the AGV trolley, a mounting support is fixedly connected to the output end of the first electric push rod, a first motor is fixedly connected to the side wall of the mounting support, and a cleaning roller is fixedly connected to an output shaft of the first motor. The storage assembly comprises a storage box fixedly connected to the top of the AGV. According to the intelligent scribing trolley planned in combination with the unmanned aerial vehicle, the aerial photography unmanned aerial vehicle can be stored and carried through the storage box, the aerial photography unmanned aerial vehicle and the scribing trolley are integrated, dust on the ground is cleaned through the cleaning roller, and the scribing definition is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering equipment, and in particular to an intelligent marking vehicle combined with drone planning. Background Art

[0002] In daily life, road marking vehicles are commonly used road marking tools. For example, lane dividing lines and zebra crossings on highways, track dividing lines on sports fields, basketball court boundaries, volleyball court boundaries, etc. all require road marking vehicles to mark boundaries.

[0003] At present, the commonly used road marking vehicles are hand-pushed road marking vehicles. However, with the development of the economy, road traffic marking has become one of the effective means to regulate road traffic. People have higher and higher requirements for road marking specifications, and there are also more and more stringent requirements for the boundary dimensions of some competitive sports fields. The marking method of manually pushing road marking vehicles will not only produce large errors, but also cause a certain amount of resource waste. In order to achieve high efficiency, save manpower, and mark accurately, and at the same time reduce the tedious steps of marking, some intelligent road marking vehicles have come into being.

[0004] At present, there is a problem that smart road marking vehicles are inconvenient to use. For example, patent publication number CN109989329A discloses a smart road marking vehicle guided by a drone. The invention uses the drone to drive the vehicle to perform longitudinal uniform linear motion, and at the same time uses a frame to enable the nozzle to achieve lateral reciprocating movement on the guide rail, so that the nozzle can make precise curved motion along the preset trajectory. However, the aerial photography drone of the invention is not compatible with the AGV vehicle, and manual labor is required to carry the aerial photography drone and recover and store the aerial photography drone, which is cumbersome. In addition, dust often remains on the ground, which affects the marking effect. Therefore, there is an urgent need for a smart road marking vehicle combined with drone planning to solve the above problems. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the present invention provides an intelligent marking vehicle combined with drone planning, which solves the problem of needing manpower to carry the aerial photography drone and recover and store the drone, which is cumbersome work, and dust often remains on the ground, which affects the marking effect.

[0007] (2) Technical solution

[0008] The technical solution of the present invention to solve the above technical problems is as follows: an intelligent marking trolley combined with drone planning, including an AGV trolley and an aerial photography drone, a cleaning component is provided on the front of the AGV trolley, a storage component is provided on the top of the AGV trolley, and a marking component is provided on the outside of the AGV trolley, and the cleaning component includes a first electric push rod fixedly connected to the front of the AGV trolley, a mounting bracket is fixedly connected to the output end of the first electric push rod, a first motor is fixedly connected to the side wall of the mounting bracket, a cleaning roller is fixedly connected to the output shaft of the first motor, a cleaning brush is fixedly connected to the outside of the cleaning roller, and an end of the cleaning roller away from the first motor is fixedly connected. A hollow connecting shaft is fixedly connected, and a rotating joint is provided at the end of the hollow connecting shaft away from the cleaning roller, and a dust suction hose is installed at the end of the rotating joint away from the hollow connecting shaft. The storage assembly includes a storage box fixedly connected to the top of the AGV trolley, and a first threaded rotating shaft is rotatably connected to the inner bottom wall of the storage box, and the external thread of the first threaded rotating shaft is connected to the lifting platform. The bottom of the lifting platform is fixedly connected to a second motor, and a bidirectional threaded rotating shaft is fixedly connected to the output shaft of the second motor, and the external thread of the bidirectional threaded rotating shaft is connected to a first sliding sleeve, and a fixed clamp is fixedly connected to the top of the first sliding sleeve, and the fixed clamp is adapted to the base bracket of the aerial photography drone.

[0009] The beneficial effects of the present invention are:

[0010] This intelligent marking trolley combined with drone planning can store and carry aerial photography drones through a storage box, integrating the aerial photography drone and the marking trolley into one, reducing labor intensity and improving marking accuracy. In addition, a cleaning roller is used to clean dust on the ground, thereby improving the clarity of the marking.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the number of the first sliding sleeves is two, and the two first sliding sleeves are symmetrically distributed at both ends of the bidirectional threaded shaft. A sliding groove opening is opened inside the lifting platform, and the fixed clamping block extends to the top of the lifting platform through the sliding groove opening. The interior of the storage box is fixedly connected to a limiting slide rod, and the lifting platform is slidably connected to the outside of the limiting slide rod.

[0013] The beneficial effect of adopting the above further solution is that when the second motor drives the bidirectional threaded shaft to rotate, the two first sliding sleeves move toward each other, and the base bracket of the aerial photography drone is clamped and fixed by the fixed clamp block.

[0014] Furthermore, a third motor is fixedly connected to the inner bottom wall of the storage box, a worm is fixedly connected to the output shaft of the third motor, and a worm wheel connected to the worm is fixedly connected to the outside of the first threaded shaft.

[0015] The beneficial effect of adopting the above further solution is that the worm drives the worm wheel to rotate through the third motor, thereby rotating the first threaded shaft and causing the lifting platform to move up and down.

[0016] Furthermore, a dust suction hole is opened inside the cleaning roller, and the cleaning brushes are arranged in a circular array on the outside of the cleaning roller. A dust box is fixedly connected to the top of the AGV cart, and a vacuum cleaner is fixedly installed on the side wall of the dust box. The end of the dust box away from the vacuum cleaner is fixedly connected to the dust suction hose.

[0017] The beneficial effect of adopting the above further solution is that, by starting the vacuum cleaner, suction is generated inside the cleaning drum, thereby sucking the raised dust into the dust collecting box.

[0018] Furthermore, the marking assembly includes a fourth motor fixedly connected to the top of the AGV trolley, a second threaded shaft is fixedly connected to the output shaft of the fourth motor, the external thread of the second threaded shaft is connected to a second sleeve, the top of the AGV trolley is fixedly connected to a positioning slide rod, and the second sleeve is slidably connected to the outside of the positioning slide rod.

[0019] The beneficial effect of adopting the above further solution is that the second threaded shaft is driven to rotate by starting the fourth motor, thereby causing the second sliding sleeve to move and adjust laterally.

[0020] Furthermore, a second electric push rod is fixedly connected to the top of the second sliding sleeve, and a marking spray gun is fixedly connected to the output end of the second electric push rod.

[0021] The beneficial effect of adopting the above further solution is that the height of the marking spray gun can be adjusted by activating the second electric push rod to meet different usage requirements.

[0022] Furthermore, a material box is fixedly connected to the top of the AGV trolley, a feeding pump is fixedly installed on the top of the material box, a feeding pipe is fixedly connected to the discharge end of the feeding pump, the end of the feeding pipe away from the feeding pump is fixedly connected to the marking spray gun, and a filling pipe is fixedly connected to the top of the material box.

[0023] The beneficial effect of adopting the above further solution is that the desired coating is delivered to the marking spray gun by the feeding pump.

[0024] Furthermore, an antenna is installed on the front of the storage box, a warning light is fixedly connected to the back of the AGV car, and a reflective sticker is pasted on the back of the AGV car.

[0025] The beneficial effect of adopting the above further solution is that the warning light can alert vehicles coming from behind, and the reflective stickers can be used to improve safety.

[0026] Furthermore, a fifth motor is fixedly connected to the inner wall of the storage box, a rotating rod is fixedly connected to the output shaft of the fifth motor, a gear is fixedly connected to the outside of the rotating rod, an exhibition board is slidably connected to the inside of the storage box, a tooth mark groove is provided inside the exhibition board, the gear is engaged with the tooth mark groove, and a rangefinder is fixedly installed on the side wall of the AGV cart.

[0027] The beneficial effect of adopting the above further solution is that the fifth motor drives the rotating rod to rotate, thereby causing the gear to drive the display board to move, making it easier for the two display boards to be expanded and retracted, thereby achieving protection for the aerial photography drone. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is a back view of the structure of the present invention;

[0030] Figure 3 Schematic diagram of the structure of the display board in the present invention;

[0031] Figure 4 A schematic diagram of the structure of the storage box of the present invention;

[0032] Figure 5 A schematic diagram of the structure of the cleaning roller of the present invention;

[0033] Figure 6 This is an enlarged structural diagram of Figure A in the present invention.

[0034] Figure: 1, AGV trolley; 2, first electric push rod; 3, mounting bracket; 4, first motor; 5, cleaning roller; 6, cleaning brush; 7, hollow connecting shaft; 8, rotary joint; 9, vacuum hose; 10, storage box; 11, first threaded shaft; 12, lifting platform; 13, second motor; 14, two-way threaded shaft; 15, first sliding sleeve; 16, fixed clamp; 17, limit slide; 18, third motor; 19, worm; 20, worm gear; 21, Dust suction hole; 22. Dust collection box; 23. Vacuum cleaner; 24. Fourth motor; 25. Second threaded shaft; 26. Second sleeve; 27. Positioning slide; 28. Second electric push rod; 29. ​​Marking spray gun; 30. Feed pipe; 31. Feed pump; 32. Material box; 33. Filling pipe; 34. Antenna; 35. Warning light; 36. Reflective sticker; 37. Fifth motor; 38. Rotating rod; 39. Gear; 40. Display board; 41. Aerial photography drone; 42. Rangefinder. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] In the embodiment, Figure 1-6 Provided is an intelligent marking trolley combined with drone planning. The present invention includes an AGV trolley 1 and an aerial photography drone 41. A cleaning component is provided on the front of the AGV trolley 1. The cleaning component includes a first electric push rod 2 fixedly connected to the front of the AGV trolley 1, a mounting bracket 3 is fixedly connected to the output end of the first electric push rod 2, a first motor 4 is fixedly connected to the side wall of the mounting bracket 3, a cleaning roller 5 is fixedly connected to the output shaft of the first motor 4, and a cleaning brush 6 is fixedly connected to the outside of the cleaning roller 5.

[0037] In this embodiment, in actual use, the first electric push rod 2 is started to move the cleaning roller 5 close to the ground, and the first motor 4 is used to drive the cleaning roller 5 to rotate, so that the cleaning brush 6 sweeps away the dust on the ground to ensure that the subsequent marking is clear.

[0038] Specifically, refer to Figure 5 The end of the cleaning roller 5 away from the first motor 4 is fixedly connected to a hollow connecting shaft 7, the end of the hollow connecting shaft 7 away from the cleaning roller 5 is provided with a rotary joint 8, the end of the rotary joint 8 away from the hollow connecting shaft 7 is installed with a dust suction hose 9, a dust suction hole 21 is opened inside the cleaning roller 5, and the cleaning brush 6 is arranged in a circular array on the outside of the cleaning roller 5. A dust collecting box 22 is fixedly connected to the top of the AGV car 1, and a dust collector 23 is fixedly installed on the side wall of the dust collecting box 22. The end of the dust collecting box 22 away from the dust collector 23 is fixedly connected to the dust suction hose 9.

[0039] In this embodiment, in actual use, a filter is provided at the connection between the vacuum cleaner 23 and the dust box 22 . By starting the vacuum cleaner 23 , suction is generated inside the cleaning roller 5 , thereby sucking the raised dust into the dust box 22 through the dust suction holes 21 .

[0040] Specifically, refer to Figure 4A storage component is provided on the top of the AGV trolley 1, and the storage component includes a storage box 10 fixedly connected to the top of the AGV trolley 1, and a first threaded shaft 11 is rotatably connected to the inner bottom wall of the storage box 10, and the external thread of the first threaded shaft 11 is connected to a lifting platform 12, and the bottom of the lifting platform 12 is fixedly connected to a second motor 13, and a bidirectional threaded shaft 14 is fixedly connected to the output shaft of the second motor 13, and the external thread of the bidirectional threaded shaft 14 is connected to a first sleeve 15, and the top of the first sleeve 15 is fixedly connected to a fixed clamp 16, which is adapted to the base bracket of the aerial photography drone 41.

[0041] There are two first sliding sleeves 15, and the two first sliding sleeves 15 are symmetrically distributed at both ends of the bidirectional threaded shaft 14. A sliding groove is opened inside the lifting platform 12, and the fixed clamping block 16 extends through the sliding groove to the top of the lifting platform 12. The interior of the storage box 10 is fixedly connected to the limiting slide rod 17, and the lifting platform 12 is slidably connected to the outside of the limiting slide rod 17.

[0042] In this embodiment, in actual use, by starting the second motor 13 to drive the bidirectional threaded shaft 14 to rotate, the two first sleeves 15 move toward each other, and the two fixed clamps 16 are brought close to each other to clamp and fix the base bracket of the aerial photography drone 41 to ensure stability during transportation.

[0043] In this embodiment, in actual use, a third motor 18 is fixedly connected to the inner bottom wall of the storage box 10, a worm 19 is fixedly connected to the output shaft of the third motor 18, and a worm wheel 20 that is transmission-connected to the worm 19 is fixedly connected to the outside of the first threaded shaft 11. The worm 19 drives the worm wheel 20 to rotate through the third motor 18, thereby rotating the first threaded shaft 11 and causing the lifting platform 12 to move up and down, allowing the aerial photography drone 41 to be inside the storage box 10.

[0044] Specifically, refer to Figure 3 A fifth motor 37 is fixedly connected to the inner wall of the storage box 10, a rotating rod 38 is fixedly connected to the output shaft of the fifth motor 37, a gear 39 is fixedly connected to the outside of the rotating rod 38, an exhibition board 40 is slidably connected to the inside of the storage box 10, a tooth groove is opened inside the exhibition board 40, and the gear 39 engages with the tooth groove. A rangefinder 42 is fixedly installed on the side wall of the AGV car 1.

[0045] In this embodiment, in actual use, the fifth motor 37 drives the rotating rod 38 to rotate, so that the gear 39 drives the display board 40 to move, so as to facilitate the expansion and retraction of the two display boards 40 to achieve protection for the aerial photography drone 41.

[0046] Specifically, refer to Figure 6A marking assembly is provided on the outside of the AGV trolley 1, and the marking assembly includes a fourth motor 24 fixedly connected to the top of the AGV trolley 1, a second threaded shaft 25 is fixedly connected to the output shaft of the fourth motor 24, and the external thread of the second threaded shaft 25 is connected to the second sleeve 26, a positioning slide rod 27 is fixedly connected to the top of the AGV trolley 1, and the second sleeve 26 is slidably connected to the outside of the positioning slide rod 27.

[0047] In this embodiment, in actual use, the top of the second sleeve 26 is fixedly connected to the second electric push rod 28, and the output end of the second electric push rod 28 is fixedly connected to the marking spray gun 29. By starting the fourth motor 24 to drive the second threaded shaft 25 to rotate, the second sleeve 26 is moved laterally and the position of the marking spray gun 29 is adjusted laterally. By starting the second electric push rod 28, the height of the marking spray gun 29 is adjusted to meet different usage requirements.

[0048] In this embodiment, in actual use, a material box 32 is fixedly connected to the top of the AGV trolley 1, a feeding pump 31 is fixedly installed on the top of the material box 32, a feeding pipe 30 is fixedly connected to the discharge end of the feeding pump 31, and the end of the feeding pipe 30 away from the feeding pump 31 is fixedly connected to the marking spray gun 29, and a filling pipe 33 is fixedly connected to the top of the material box 32, and the paint in the material box 32 is fed into the marking spray gun 29 through the feeding pump 31.

[0049] In this embodiment, in actual use, an antenna 34 is installed on the front of the storage box 10, a warning light 35 is fixedly connected to the back of the AGV cart 1, and a reflective strip 36 is pasted on the back of the AGV cart 1. The AGV cart includes a gyroscope, a controller, a battery and a wireless communication system arranged inside it, and the wireless communication device includes a wireless signal receiver, a decoder, an encoder and a wireless signal transmitter. The wireless communication device is used to connect the signal with the aerial camera on the drone and the engineering notebook in the hands of the construction workers in a wireless communication manner, so that the aerial camera can transmit image information to the AGV cart and the engineering notebook, and the construction workers can remotely control the work of the AGV cart. The AGV cart 1 is a conventional known device, and the control circuit of its internal controller can be realized by simple programming by technicians in this field. The warning light 35 is used to warn vehicles coming from behind, and the reflective strip 36 is used to improve safety.

[0050] Working principle:

[0051] First, technicians control the AGV 1 to move to the work site, and use the fifth motor 37 to drive the rotating rod 38 to rotate, thereby causing the gear 39 to drive the display board 40 to move, so that the two display boards 40 can be unfolded. At the same time, the third motor 18 is started to cause the worm 19 to drive the worm wheel 20 to rotate, thereby causing the first threaded shaft 11 to rotate, causing the lifting platform 12 to move upward. The second motor 13 is started to drive the bidirectional threaded shaft 14 to rotate, so that the two first sliding sleeves 15 drive the two fixed clamps 16 to move away from each other, canceling the fixed state of the base bracket of the aerial photography drone 41, and controlling the aerial photography drone 41 to ascend for aerial photography operations and route planning.

[0052] Then: the AGV trolley 1 moves according to the planned road, and the cleaning roller 5 is moved close to the ground by starting the first electric push rod 2, and the cleaning roller 5 is driven to rotate by the first motor 4, so that the cleaning brush 6 lifts the dust on the ground. At the same time, the vacuum cleaner 23 is started to generate suction inside the cleaning roller 5, so that the raised dust is sucked into the dust collecting box 22 through the dust suction hole 21, and the paint in the material box 32 is fed into the marking spray gun 29 through the feeding pump 31 for marking. The fourth motor 24 is driven to rotate the second threaded shaft 25, so that the second sleeve 26 is moved laterally and the position of the marking spray gun 29 is adjusted laterally. The height of the marking spray gun 29 is adjusted by starting the second electric push rod 28 to meet different usage requirements.

[0053] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0054] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent marking vehicle combined with drone planning, comprising an AGV vehicle (1) and an aerial photography drone (41), characterized in that: The front of the AGV trolley (1) is provided with a cleaning component, the top of the AGV trolley (1) is provided with a storage component, and the outside of the AGV trolley (1) is provided with a marking component; The cleaning assembly comprises a first electric push rod (2) fixedly connected to the front of the AGV trolley (1); a mounting bracket (3) fixedly connected to the output end of the first electric push rod (2); a first motor (4) fixedly connected to the side wall of the mounting bracket (3); a cleaning roller (5) fixedly connected to the output shaft of the first motor (4); a cleaning brush (6) fixedly connected to the outside of the cleaning roller (5); a hollow connecting shaft (7) fixedly connected to the end of the cleaning roller (5) away from the first motor (4); a rotary joint (8) is provided at the end of the hollow connecting shaft (7) away from the cleaning roller (5); and a dust suction hose (9) is installed at the end of the rotary joint (8) away from the hollow connecting shaft (7); The storage assembly includes a storage box (10) fixedly connected to the top of the AGV trolley (1), a first threaded shaft (11) is rotatably connected to the inner bottom wall of the storage box (10), the first threaded shaft (11) is externally threadedly connected to a lifting platform (12), the bottom of the lifting platform (12) is fixedly connected to a second motor (13), the output shaft of the second motor (13) is fixedly connected to a bidirectional threaded shaft (14), the external thread of the bidirectional threaded shaft (14) is connected to a first sliding sleeve (15), the top of the first sliding sleeve (15) is fixedly connected to a fixed clamping block (16), and the fixed clamping block (16) is adapted to the base bracket of the aerial photography drone (41).

2. The intelligent road marking vehicle combined with drone planning according to claim 1, characterized in that: The number of the first sliding sleeves (15) is two, and the two first sliding sleeves (15) are symmetrically distributed at both ends of the bidirectional threaded shaft (14). A sliding groove is provided inside the lifting platform (12), and the fixed clamping block (16) extends through the sliding groove to the top of the lifting platform (12). The interior of the storage box (10) is fixedly connected to a limiting sliding rod (17), and the lifting platform (12) is slidably connected to the outside of the limiting sliding rod (17).

3. The intelligent road marking vehicle combined with drone planning according to claim 1 is characterized in that: A third motor (18) is fixedly connected to the inner bottom wall of the storage box (10), a worm (19) is fixedly connected to the output shaft of the third motor (18), and a worm wheel (20) in transmission connection with the worm (19) is fixedly connected to the outside of the first threaded rotating shaft (11).

4. The intelligent road marking vehicle combined with drone planning according to claim 1, characterized in that: The cleaning roller (5) is provided with a dust suction hole (21) inside, the cleaning brush (6) is arranged in a circular array outside the cleaning roller (5), the top of the AGV trolley (1) is fixedly connected to a dust collecting box (22), a dust collector (23) is fixedly installed on the side wall of the dust collecting box (22), and the end of the dust collecting box (22) away from the dust collector (23) is fixedly connected to a dust suction hose (9).

5. The intelligent road marking vehicle combined with drone planning according to claim 1 is characterized in that: The marking assembly includes a fourth motor (24) fixedly connected to the top of the AGV trolley (1), a second threaded shaft (25) fixedly connected to the output shaft of the fourth motor (24), an external thread of the second threaded shaft (25) connected to a second sliding sleeve (26), a positioning slide rod (27) fixedly connected to the top of the AGV trolley (1), and the second sliding sleeve (26) slidably connected to the outside of the positioning slide rod (27).

6. The intelligent road marking vehicle combined with drone planning according to claim 5, characterized in that: A second electric push rod (28) is fixedly connected to the top of the second sliding sleeve (26), and a marking spray gun (29) is fixedly connected to the output end of the second electric push rod (28).

7. The intelligent road marking vehicle combined with drone planning according to claim 6, characterized in that: The top of the AGV trolley (1) is fixedly connected to a material box (32), a feeding pump (31) is fixedly installed on the top of the material box (32), a feeding pipe (30) is fixedly connected to the discharge end of the feeding pump (31), an end of the feeding pipe (30) away from the feeding pump (31) is fixedly connected to the marking spray gun (29), and a filling pipe (33) is fixedly connected to the top of the material box (32).

8. The intelligent road marking vehicle combined with drone planning according to claim 1, characterized in that: An antenna (34) is installed on the front of the storage box (10), a warning light (35) is fixedly connected to the back of the AGV trolley (1), and a reflective sticker (36) is attached to the back of the AGV trolley (1).

9. The intelligent road marking vehicle combined with drone planning according to claim 1, characterized in that: A fifth motor (37) is fixedly connected to the inner wall of the storage box (10), a rotating rod (38) is fixedly connected to the output shaft of the fifth motor (37), a gear (39) is fixedly connected to the outside of the rotating rod (38), an exhibition board (40) is slidably connected to the inside of the storage box (10), a tooth groove is provided inside the exhibition board (40), and the gear (39) is engaged with the tooth groove. A rangefinder (42) is fixedly installed on the side wall of the AGV trolley (1).

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