A pipeline detector for surveying and mapping and its use method

Abstract

The present application relates to a pipeline detector for surveying and mapping and a method of using the same, and relates to the field of pipeline detectors, which includes a transmitter and a receiver, wherein the receiver includes a receiver body, a handle and a display, wherein the handle is fixedly mounted on one side of the upper end of the receiver body, and the display is fixedly mounted on one end of the handle away from the receiver body, and a powder box is provided on one side of the lower end of the receiver body, and a discharge port is provided at the lower end of the powder box, and the receiver body is provided with a driving device for driving the discharge port to open and close, and the receiver body is provided with a fan, and an air port of the fan is connected to a first air pipe, and the end of the first air pipe away from the fan extends to the lower end of the receiver body. The present application can use a fan to blow air to clean the ground before the powder is spilled for marking, which has a more convenient effect of cleaning and recycling the powder.

Description

Technical Field

[0001] The present invention relates to the field of pipeline detectors, and in particular to a pipeline detector for surveying and mapping and a use method thereof. Background Art

[0002] The pipeline detector is mainly used to detect the direction and depth of underground pipelines by using the signals of the transmitter and receiver in a trenchless manner when pipeline detection is needed. For different pipelines, the pipeline detector has detection methods such as direct connection method, clamp method and induction method, and can be used with specific software to map the pipeline to achieve pipeline mapping.

[0003] Related technologies can refer to the Chinese patent with announcement number CN213750370U, which discloses a pipeline detector belonging to the field of exploration tools, including a detector body, a marking mechanism installed on the detector body, the marking mechanism including a tank body and a driving mechanism installed on the detector body, the tank body is filled with marking pigment, a material leakage port is opened at the bottom of the tank body, and a cover is movable on the leakage port, the driving mechanism includes a mounting plate and a driving rod, the mounting plate is arranged above the tank body and fixed to the detector body, the driving rod is arranged vertically and one end along the axial direction extends into the tank body and is connected to the cover, and the end of the driving rod away from the cover passes through the mounting plate and is connected to the mounting plate thread. This application does not need to use auxiliary marking tools such as benchmarks to mark the position and direction of the pipeline, so that the position and direction of the pipeline can be marked while detecting.

[0004] With respect to the above-mentioned related technologies, the inventors believe that when the pipeline detector detects a damaged point in the pipeline or needs to mark the pipeline path, the powder in the tank is sprinkled to the location for marking. Due to the complex and changeable ground environment, it is inconvenient to clean and recover the powder after it is sprinkled. Summary of the invention

[0005] In order to facilitate the cleaning and recovery of powder, the present application provides a pipeline detector for surveying and mapping and a method for using the same.

[0006] In the first aspect, the present application provides a pipeline detector for surveying and mapping, which adopts the following technical solution:

[0007] A pipeline detector for surveying and mapping includes a transmitter and a receiver. The receiver includes a receiver body, a handle and a display. The handle is fixedly arranged on one side of the upper end of the receiver body, and the display is fixedly arranged on the end of the handle away from the receiver body. A powder box is provided on one side of the lower end of the receiver body, and a discharge port is provided at the lower end of the powder box. The receiver body is provided with a driving device for driving the discharge port to open and close. The receiver body is provided with a fan, and an air outlet of the fan is connected to a first air pipe. The end of the first air pipe away from the fan extends to the lower end of the receiver body.

[0008] By adopting the above technical solution, after placing the transmitter, the user uses the handle to hold the receiver for pipeline detection. When marking is required, the fan is controlled to blow air to the ground through the first air pipe to clean up the debris and dust on the ground. Then the drive device is used to open the discharge port. The powder falls on the ground through the discharge port under the action of gravity for marking. Since the ground has been cleaned, it is more convenient to clean and recycle the powder.

[0009] Optionally, a recovery box is connected to the middle position of the first air pipe, a filter bag is provided in the recovery box, the inside of the filter bag is connected to the part of the first air pipe close to the fan, the part of the first air pipe close to the lower end of the receiver body is connected to the part outside the filter bag in the recovery box, the powder box is connected to the part outside the filter bag in the recovery box via a return pipe, and the return pipe is provided with a valve.

[0010] By adopting the above technical solution, when cleaning the powder, the user aligns the lower end of the first air pipe with the powder on the ground, and then controls the fan to flip and draw air from the first air pipe, and then draws the powder into the recovery box. The powder is intercepted by the filter bag. After the user opens the valve, the powder can return to the powder box, realizing the recovery of the powder. The structure is simple and the recovery is convenient.

[0011] Optionally, the driving device includes a pull rope, a hand pressure rod and a baffle, the baffle is located in the powder box and closes the discharge port, an elastic member is provided between the side of the baffle away from the discharge port and the powder box, one end of the pull rope is connected to the side of the baffle away from the discharge port, and the other end is connected to one end of the hand pressure rod, the hand pressure rod is located below the handle, and the end of the hand pressure plate away from the pull rope is hinged to the display.

[0012] By adopting the above technical solution, the elastic member automatically presses the baffle against the discharge port to block the discharge port in a natural state. The user manually pulls the hand pressure rod upwards, and the baffle can be pulled up via the pull rope, so that the powder can be sprinkled through the discharge port. The structure is simple and the control is convenient.

[0013] Optionally, the lower end of the first air pipe is connected to a shunt pipe, and the shunt pipe is provided with a strip hole arranged along the width direction of the receiver body.

[0014] By adopting the above technical solution, the air in the first air pipe is blown onto the ground through the strip holes. The air can expand the effective area along the width direction of the receiver body through the strip holes, which is beneficial to improving the cleaning effect.

[0015] Optionally, a filter plate is provided in the strip-shaped hole.

[0016] By adopting the above technical solution, the dust enters the first air pipe through the strip holes and then enters the recovery box. The filter plate can intercept impurities accidentally sucked into the strip holes, thereby achieving a filtering effect and helping to improve the cleanliness of the recovered dust.

[0017] Optionally, a windshield is fixedly provided on one side of the lower end of the shunt pipe close to the receiver body.

[0018] By adopting the above technical solution, when the diverter pipe blows air outward to clean the ground and the powder is scattered, the diverter plate can play a wind blocking role, and the wind blown out by the diverter pipe is not easy to affect the scattering position of the powder, which is conducive to improving the marking accuracy.

[0019] Optionally, the handle outer shell is provided with a sleeve, the sleeve is coaxially arranged with the handle, and a plurality of balls are rollingly connected between the sleeve and the handle.

[0020] By adopting the above technical solution, the sleeve can achieve relative rotation with less friction under the action of the ball. The user can swing the receiver in place, and the receiver will automatically remain perpendicular to the ground under the action of gravity. The user does not need to move left or right, which improves the convenience of use.

[0021] Optionally, a lighting lamp is provided at the lower end of the display.

[0022] By adopting the above technical solution, when detecting at night or on the ground with dim light, the user can turn on the lighting for illumination without holding additional lighting equipment, thereby improving the convenience of use.

[0023] In a second aspect, the present application provides a method for using a pipeline detector for surveying and mapping, comprising the following steps:

[0024] S1: Install the transmitter, select the appropriate detection method according to the pipeline type, and place the transmitter above the pipeline;

[0025] S2: Detect the direction of the pipeline. Move the handheld receiver above the ground and determine the direction of the pipeline based on the data on the display.

[0026] S3: Clean the ground and control the fan to blow air to the ground below the receiver body through the first air pipe;

[0027] S4: Powder marking, use the drive device to control the discharge port to open, so that the powder falls on the ground.

[0028] By adopting the above technical solution, before using powder for marking, a fan is used to blow air to the ground through the first air pipe to clean the dirt on the ground, so as to facilitate the subsequent cleaning and recovery of the powder spilled on the ground.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] By setting the fan and the first air pipe, the user places the transmitter and uses the handle to hold the receiver for pipeline detection. When marking is required, the fan is controlled to blow air to the ground through the first air pipe to clean up the debris and dust on the ground. Then the drive device is used to open the discharge port, and the powder falls on the ground through the discharge port under the action of gravity for marking. Since the ground has been cleaned, it is more convenient to clean and recycle the powder.

[0031] By setting a recovery box, a return pipe and a valve, when cleaning the powder, the user aligns the lower end of the first air pipe with the powder on the ground, and then controls the fan to flip and draw air from the first air pipe, and then draws the powder into the recovery box, and the powder is retained by the filter bag. After the user opens the valve, the powder can return to the powder box through the return pipe, thereby realizing the recovery of the powder. The structure is simple and the recycling is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of a pipeline detector for surveying and mapping of the present application.

[0033] Figure 2 It is a schematic diagram of the cross-sectional structure of the receiver of the present application.

[0034] Figure 3 yes Figure 2 Enlarged schematic diagram of part A.

[0035] Figure 4 It is a flowchart of a method for using a pipeline detector for surveying and mapping in the present application.

[0036] Explanation of the accompanying drawings: 1. Transmitter; 2. Receiver; 21. Receiver body; 22. Handle; 221. Sleeve; 222. Ball; 23. Display; 231. Light; 3. Powder box; 31. Discharge port; 4. Driving device; 41. Pull rope; 42. Hand pressure rod; 43. Baffle; 431. Arc connecting plate; 44. Elastic member; 5. Fan; 6. First air pipe; 7. Diverter pipe; 71. Strip hole; 72. Filter plate; 8. Recovery box; 81. Filter bag; 9. Return pipe; 91. Valve; 10. Wind shield. DETAILED DESCRIPTION

[0037] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0038] The embodiment of the present application discloses a pipeline detector for surveying and mapping.

[0039] Reference Figure 1A pipeline detector for surveying and mapping includes a transmitter 1 and a receiver 2. Before use, the user places the transmitter 1 above the pipeline. If the detected pipeline has a part exposed on the surface, the transmitter 1 is connected to the pipeline, and then the handheld receiver 2 is moved above the surface. After determining the specific direction of the pipeline, the user controls the receiver 2 to move left and right, while keeping the lower end of the receiver 2 vertical to the ground, so as to detect the specific position of the pipeline and the buried depth of the pipeline.

[0040] Reference Figure 1 The receiver 2 includes a receiver body 21, a handle 22 and a display 23. The handle 22 is fixedly installed on the upper end of the receiver body 21. The handle 22 is cylindrical and convenient for the user to hold. When in use, the axis of the handle 22 is in a horizontal state, and the user holds the handle 22 with one hand; at this time, under the action of gravity, the lower end of the receiver body 21 is automatically in a vertical state perpendicular to the ground. The user controls the lower end of the receiver body 21 to maintain a suitable distance of 10-20cm from the ground, and then turns on the receiver 2 for motion detection.

[0041] Reference Figure 1 and Figure 2 The display 23 is installed at the end of the handle 22 away from the receiver body 21. The user determines the position and buried depth of the pipeline by observing the content displayed on the display 23. A lighting lamp 231 is installed at the lower end of the display 23. When the user performs night surveying or is in a dimly lit scene, the lighting lamp 231 can be turned on. The light of the lighting lamp 231 is tilted downward to illuminate the ground in front of the user, which is convenient for the user to judge the road situation in time and reduce the risk of tripping and other dangerous phenomena caused by the user concentrating on observing the display 23.

[0042] Reference Figure 1 and Figure 2 A sleeve 221 is disposed outside the handle 22, and the sleeve 221 is coaxially arranged with the handle 22. A gap is left between the outer wall surface of the handle 22 and the inner wall surface of the sleeve 221, and a plurality of balls 222 are installed in the gap. A part of the balls 222 is embedded in the handle 22 and abuts against the inner wall of the sleeve 221. Under the action of the balls 222, the friction between the sleeve 221 and the handle 22 is small; the user holds the sleeve 221 to hold the receiver 2, and when the receiver body 21 needs to be moved left and right, he only needs to shake his arm left and right. At this time, the receiver body 21 pulls the handle 22 and the sleeve 221 to rotate relative to each other under the action of gravity, and then keeps shaking left and right in a state perpendicular to the ground, without the need for the user to shake his body left and right to ensure that the receiver body 21 is perpendicular to the ground, and the user's operation is more convenient and labor-saving.

[0043] Reference Figure 1A fan 5 is fixedly installed on the side of the upper end of the receiver body 21 facing away from the user. The fan 5 is a dual-purpose fan for exhaust and blowing. One air outlet of the fan 5 is connected to a first air pipe 6, and the first air pipe 6 is divided into an upper and lower section; a recovery box 8 is installed in the middle position in the height direction of the receiver body 21, and the lower end of the upper section of the first air pipe 6 is connected to the inside of the recovery box 8 from the upper end of the recovery box 8; when it is necessary to mark the direction of the pipeline or detect a damaged point in the pipeline, etc., the user turns on the blowing state of the fan 5 to blow air into the first air pipe 6 and the recovery box 8.

[0044] Reference Figure 1 and Figure 3 The lower section of the first air pipe 6 is connected to the inside of the recovery box 8 from the lower end of the recovery box 8, and the lower end of the lower section extends to the lower end of the receiver body 21. The wind blown into the recovery box 8 by the fan 5 extends to the lower end of the receiver body 21 through the lower section of the first air pipe 6; a shunt pipe 7 is fixedly installed at the lower end of the receiver body 21, and the shunt pipe 7 is provided with a strip hole 71 arranged along the width direction of the receiver body 21. The wind in the lower section is blown out to the outside of the shunt pipe 7 through the strip hole 71. Under the action of the strip hole 71, strong wind is blown out at different positions in the width direction of the receiver body 21.

[0045] Reference Figure 3 The opening of the strip hole 71 is located at the lower end of the shunt pipe 7 and is inclined toward the direction of the receiver body 21 away from the user, thereby blowing away the debris on the ground below and in front of the receiver body 21, and the ground that the user needs to mark is relatively clean.

[0046] Reference Figure 2 and Figure 3 A powder box 3 is fixedly installed on the side of the lower end of the receiver body 21 close to the user. Before the surveying and mapping begins, the user needs to confirm whether there is enough powder left in the powder box 3. The powder is dyed sand. If there is less powder, it needs to be added to the powder box 3; the lower end face of the powder box 3 is inclined, and gradually becomes closer to the receiver body 21 from top to bottom. A discharge port 31 is opened on the box wall of this face of the powder box 3. Under the action of gravity, it can be ensured that there is enough powder in the powder box 3 near the discharge port 31. The receiver body 21 is equipped with a driving device 4 for driving the discharge port 31 to open and close. Under normal conditions, the discharge port 31 is in a closed state under the action of the driving device 4, and the powder is not easy to leak accidentally.

[0047] Reference Figure 2 and Figure 3The driving device 4 includes a pull rope 41, a hand pressure rod 42 and a baffle 43. The hand pressure rod 42 is located below the handle 22. The projection of the hand pressure rod 42 on the horizontal plane is parallel to the axis of the handle 22. The end of the hand pressure rod 42 facing away from the user is hinged to the lower end of the display screen, and the other end is connected to the upper end of the pull rope 41 and its height is lower than the height of the other end; the user hooks the hand pressure rod 42 with the fingers of the hand holding the sleeve 221, and then presses the end of the hand pressure rod 42 close to the pull rope 41 in the direction close to the handle 22, thereby driving the pull rope 41 to move upward.

[0048] Reference Figure 3 The baffle 43 is located at the discharge port 31, and an arc-shaped connecting plate 431 is installed on the side of the baffle 43 close to the inside of the powder box 3. An elastic member 44 is installed on the side of the arc-shaped connecting plate 431 away from the baffle 43. The elastic member 44 is made of rubber blocks. When the elastic member 44 is in a natural state, the baffle 43 completely closes the discharge port 31. The lower end of the baffle 43 is hinged to the powder box 3, and the axis of the arc-shaped connecting plate 431 is at the hinge between the baffle 43 and the powder box 3; the end of the pull rope 41 away from the hand pressure rod 42 passes through the receiver body 21 and extends downward into the powder box 3 and is connected to the upper end of the baffle 43.

[0049] Reference Figure 3 Under the pull of the pull rope 41, the upper end of the baffle 43 rotates toward the direction close to the receiver body 21, and at the same time the arc-shaped connecting plate 431 compresses the elastic member 44. At this time, the discharge port 31 gradually opens, and the inside and outside of the powder box 3 are connected at the discharge port 31. The powder automatically falls to the position below the receiver body 21 under the action of gravity to achieve marking. Since the ground has been cleaned by air blowing in advance, it is not easy for too many impurities to remain on the ground and mix with the powder.

[0050] Reference Figure 2 A windshield 10 is fixedly installed just below the receiver body 21. The windshield 10 separates the shunt pipe 7 from the space below the powder box 3. The windshield 10 is close to the ground. When the powder needs to be sprinkled continuously for marking the direction of the hanging line, and the fan 5 continues to blow air to clean the ground, the windshield 10 can effectively block the wind blown out of the shunt pipe 7. The fast-flowing air is not easy to turn at the ground to affect the scattering direction of the powder. The marking accuracy is high, and the powder is not easy to be blown away, which is convenient for cleaning and recycling the powder afterwards.

[0051] Reference Figure 2 and Figure 3When the powder needs to be cleaned and recovered after the surveying is completed, the user aligns the strip hole 71 with the powder on the ground, and then controls the fan 5 to be in the exhaust state. At this time, the outside air drives the powder on the ground to be sucked into the shunt pipe 7 through the strip hole 71, and then enters the recovery box 8 through the lower section of the first air pipe 6. Under the action of the strip hole 71 of the shunt pipe 7, the exhaust range of the lower end of the receiver body 21 is large, and the user's operation is more convenient. A filter plate 72 is fixedly installed in the strip hole 71. The mesh number of the filter plate 72 is slightly larger than the mesh number of the powder. Impurities such as stones that are accidentally sucked into the strip hole 71 and have a mesh number larger than the powder are intercepted by the filter plate 72.

[0052] Reference Figure 2 , a filter bag 81 is installed in the recovery box 8, and the filter bag 81 is wrapped outside the upper section of the first air pipe 6. After passing through the filter bag 81, the air passes through the upper section of the first air pipe 6 and the fan 5, and is discharged from another air port of the fan 5. At the same time, the powder is trapped in the recovery box 8 and outside the filter bag 81. The lower end surface of the recovery box 8 is inclined, and the lower end with a lower height extends to the top of the powder box 3. A return pipe 9 is connected between the powder box 3 and the recovery box 8. A valve 91 is installed on the return pipe 9 to close the return pipe 9 in the normal state and the cleaning state. After the powder is cleaned, the user turns off the fan 5 and opens the valve 91. At this time, the powder in the recovery box 8 automatically flows back to the powder box 3 through the return pipe 9 under the action of gravity, so as to realize the recovery of the powder.

[0053] The implementation principle of the pipeline detector for surveying and mapping of the present application embodiment is as follows: when it is necessary to mark the direction of the pipeline or detect a damaged point of the pipeline, the user uses the fan 5 to blow air to the ground through the first air pipe 6 and the shunt pipe 7 to blow away the debris on the ground; then the user presses the end of the hand pressure rod 42 close to the pull rope 41 in the direction close to the handle 22, and pulls the baffle 43 through the pull rope 41 to move and open the discharge port 31, and the powder is automatically sprinkled to achieve marking. Since the ground has been cleaned by air blowing in advance, it is not easy for too many impurities to remain on the ground and mix with the powder. When recovering the powder, the user aligns the strip hole 71 with the powder on the ground, and then controls the fan 5 to exhaust air, and the powder is sucked into the recovery box 8 and intercepted by the filter bag 81; after the user turns off the fan 5 and opens the valve 91, the powder in the recovery box 8 automatically flows back to the powder box 3 through the return pipe 9 under the action of gravity, and the cleaning and recovery of the powder is more convenient.

[0054] The embodiment of the present application also discloses a method for using a pipeline detector for surveying and mapping.

[0055] Reference Figure 4 A method for using a pipeline detector for surveying and mapping comprises the following steps:

[0056] S1: Install the transmitter 1. The user selects a suitable detection method such as direct connection method, clamp method or induction method according to the type of pipeline to be detected, and places the transmitter 1 above the pipeline and turns on the power of the transmitter 1;

[0057] S2: To detect the direction of the pipeline, the user holds the sleeve 221 at the handle 22, keeps the lower end of the receiver 2 vertical to the ground, and then controls the receiver 2 to move above the ground, determines the direction of the pipeline according to the data on the display 23, and shakes the arm left and right to determine the specific position and buried depth of the pipeline, and makes a record;

[0058] S3: Cleaning the ground, the user starts the blowing state of the fan 5, controls the strip holes 71 of the shunt pipe 7 to distribute the wind to different positions in the width direction of the receiver body 21, blows the wind to the ground below the receiver body 21, blows away the dust and most of other dirt on the ground, and improves the cleanliness of the ground;

[0059] S4: Powder marking, the user holds the hand pressure lever 42, pulls the pull rope 41 upward, controls the baffle 43 to open the discharge port 31, and makes the powder automatically fall on the ground under the action of gravity for marking. After the surveying and mapping is completed, the user turns on the exhaust state of the fan 5, and aligns the strip hole 71 with the powder on the ground. The powder sucked into the recovery box 8 is intercepted by the filter bag 81. The user turns off the fan 5 and opens the valve 91. The powder in the recovery box 8 automatically flows back to the powder box 3 through the return pipe 9 under the action of gravity.

[0060] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pipeline detector for surveying and mapping, comprising a transmitter (1) and a receiver (2), characterized in that: The receiver (2) comprises a receiver body (21), a handle (22) and a display (23), wherein the handle (22) is fixedly arranged at one side of the upper end of the receiver body (21), and the display (23) is fixedly arranged at one end of the handle (22) away from the receiver body (21). A powder box (3) is arranged at one side of the lower end of the receiver body (21), and a discharge port (31) is arranged at the lower end of the powder box (3). The receiver body (21) is provided with a driving device (4) for driving the discharge port (31) to open and close. The receiver body (21) is provided with a fan (5), and an air port of the fan (5) is connected to a first air pipe (6), and an end of the first air pipe (6) away from the fan (5) extends to the lower end of the receiver body (21); The middle position of the first air pipe (6) is connected to a recovery box (8), a filter bag (81) is arranged in the recovery box (8), the inside of the filter bag (81) is connected to the part of the first air pipe (6) close to the fan (5), the part of the first air pipe (6) close to the lower end of the receiver body (21) is connected to the part outside the filter bag (81) in the recovery box (8), the powder box (3) is connected to the part outside the filter bag (81) in the recovery box (8) through a return pipe (9), and the return pipe (9) is provided with a valve (91).

2. A pipeline detector for surveying and mapping according to claim 1, characterized in that: The driving device (4) comprises a pull rope (41), a hand pressure rod (42) and a baffle (43); the baffle (43) is located in the powder box (3) and closes the discharge port (31); an elastic member (44) is provided between the side of the baffle (43) facing away from the discharge port (31) and the powder box (3); one end of the pull rope (41) is connected to the side of the baffle (43) facing away from the discharge port (31), and the other end is connected to one end of the hand pressure rod (42); the hand pressure rod (42) is located below the handle (22); and one end of the hand pressure plate facing away from the pull rope (41) is hinged to the display (23).

3. A pipeline detector for surveying and mapping according to claim 1, characterized in that: The lower end of the first air pipe (6) is connected to a shunt pipe (7), and the shunt pipe (7) is provided with a strip-shaped hole (71) arranged along the width direction of the receiver body (21).

4. A pipeline detector for surveying and mapping according to claim 3, characterized in that: A filter plate (72) is provided in the strip-shaped hole (71).

5. The pipeline detector for surveying and mapping according to claim 3, characterized in that: A windshield plate (10) is fixedly provided on one side of the lower end of the shunt pipe (7) close to the receiver body (21).

6. The pipeline detector for surveying and mapping according to claim 1, characterized in that: The handle (22) is provided with a sleeve (221) on its outer shell. The sleeve (221) and the handle (22) are coaxially arranged. A plurality of balls (222) are rollingly connected between the sleeve (221) and the handle (22).

7. The pipeline detector for surveying and mapping according to claim 1, characterized in that: The lower end of the display (23) is provided with an illumination lamp (231).

8. A method for using a pipeline detector for surveying and mapping, applied to a pipeline detector for surveying and mapping as claimed in any one of claims 1 to 7, comprising the following steps: S1: Install the transmitter (1), select a suitable detection method according to the pipeline type, and place the transmitter (1) above the pipeline; S2: Detect the direction of the pipeline, move the handheld receiver (2) above the ground, and determine the direction of the pipeline based on the data on the display (23); S3: cleaning the ground, controlling the fan (5) to blow air toward the ground below the receiver body (21) through the first air pipe (6); S4: marking the powder, using the driving device (4) to control the discharge port (31) to open, so that the powder falls on the ground.

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