An automatic mapping device and method for land surveying

By designing protective and limiting air-blowing mechanisms on the total station, the problems of pollution and high temperature affecting the total station in open-air environments are solved, achieving self-cleaning and protective functions and ensuring measurement accuracy.

CN122349192APending Publication Date: 2026-07-07SHANDONG GANTU GEOGRAPHIC INFORMATION CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG GANTU GEOGRAPHIC INFORMATION CO LTD
Filing Date
2026-03-20
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing total stations are susceptible to pollution and high temperatures in open-air environments, leading to a decline in measurement performance and making dust cleaning inconvenient.

Method used

An automatic land surveying and mapping device was designed, equipped with a protective mechanism and a limiting air blowing mechanism, including a cover, a dust collection box and a fan, for protection and cleaning. When the total station is not in use, it forms a protective cover, and at high temperatures, it dissipates heat and removes dust.

Benefits of technology

It effectively prevents the total station from being contaminated by the outside world, maintains its measurement performance, achieves self-cleaning function, and prevents dust accumulation and high temperature effects.

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Abstract

The application relates to the technical field of land surveying, and discloses a land surveying automatic mapping device and method, which comprises a machine body assembly, a foot stand assembly is installed at the bottom of the machine body assembly, a protection mechanism is further arranged at the outer side of the machine body assembly, the protection mechanism comprises cover plates, the cover plates are movably installed on the machine body assembly, the cover plates are mutually spliced to form a cover body, the machine body assembly is located in the cover body, a dust suction box is further arranged in the protection mechanism, dust adhered to the machine body assembly in the cover body is sucked and removed, a limiting air blowing mechanism is further installed on the foot stand assembly, the machine body assembly comprises a base plate, the foot stand assembly is installed at the bottom of the base plate, a horizontal adjusting mechanism is installed on the base plate, an installation plate is installed on the horizontal adjusting mechanism, a machine body is installed on the installation plate, a front display screen is arranged at the front side of the machine body, a horizontal control screw is arranged on the machine body, and a vertical control screw is arranged on the machine body, so that the machine body is protected and dust is sucked.
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Description

Technical Field

[0001] This invention relates to the field of land surveying technology, and more specifically to an automatic land surveying and mapping device and method. Background Technology

[0002] In land surveying work, in order to complete various complex surveying tasks, staff generally use total station equipment. A total station is a high-tech measuring instrument that integrates electronic angle measurement, electronic distance measurement and microprocessor. Its core function is to accurately determine the three-dimensional coordinates of ground points. For geomorphic feature points within the land survey area, the total station can perform detailed measurements, collect the three-dimensional coordinates of a large number of points, and thus draw an accurate digital topographic map; However, total stations with existing technology still have the following shortcomings in practical use; First, total stations are generally used in open-air environments. When a total station is placed at a measurement point, it will remain at that point for a period of time even after it has not been used or has been used. This increases the risk of the total station being contaminated by the external environment, thus affecting its measurement performance. Secondly, under the current technology, when the airflow in the environment is insufficient, the total station is prone to high temperature during use, which affects its performance. In addition, the dust that accumulates on the machine body cannot be cleaned in time. Therefore, in order to solve the above problems, there is a need to provide an automatic land surveying and mapping device and method. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides an automatic land surveying and mapping device and method to solve the problems existing in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an automatic land surveying and mapping device, comprising a body assembly, a tripod assembly installed at the bottom of the body assembly, and a protective mechanism provided on the outer side of the body assembly; The protective mechanism includes a cover plate, which is movably mounted on the body assembly; The cover panels are assembled together to form a cover body, and the body assembly is located inside the cover body; The protective mechanism is also equipped with a dust collection box, which removes dust adhering to the body components inside the cover.

[0005] Furthermore, the tripod assembly is also equipped with a limiting air-blowing mechanism.

[0006] Furthermore, the body assembly includes a base plate, the tripod assembly is mounted on the bottom of the base plate, a horizontal adjustment mechanism is mounted on the base plate, a mounting plate is mounted on the horizontal adjustment mechanism, the body is mounted on the mounting plate, a front display screen is provided on the front side of the body, a horizontal control screw is provided on the body, a vertical control screw is provided on the body, an objective lens is mounted on the front side of the body, and a handle is provided at the top of the body.

[0007] Furthermore, a rear display screen is provided on the rear side of the fuselage, and an eyepiece is installed on the rear side of the fuselage component. The eyepiece is equipped with a telescope focusing screw.

[0008] Furthermore, the protective mechanism includes a movable groove, which is formed on the base plate. Connecting shafts are installed on both sides of the movable groove. Cover plates are movably installed on the movable groove through the connecting shafts. The cover plates are assembled with each other to form a complete cover body, and the body assembly is located in the cover body.

[0009] Furthermore, the cover has evenly distributed air grooves, and magnetic strips are installed on the sides of the cover. When the cover is assembled, it is attracted by adjacent magnetic strips. The top of the cover has a top groove, and the cover is also provided with a cover plate. The bottom of the cover plate has a mating edge protrusion. After the air grooves are assembled, the mating edge protrusion and the top groove are mated together.

[0010] Furthermore, dust collection boxes are installed at the bottom of the inner walls on both sides of the cover, a through groove is opened at the upper end of the dust collection box, a filter plate is fixedly installed in the dust collection box, and a fan is installed at the bottom of the dust collection box.

[0011] Furthermore, the filter plate has an opening on its upper inner side, and a soft cotton brush is movably fitted into the opening. The inner wall of the cover plate has a track groove, and a medium air box is fixedly installed in the track groove. Elastic telescopic airbags are symmetrically installed on both sides of the medium air box, and a slider is installed on the outer end of each elastic telescopic airbag. The slider is movably fitted into the track groove.

[0012] Furthermore, a flexible rod is connected between the slider and the soft cotton brush, and air holes are provided on the cover, which are connected to the central air box.

[0013] Furthermore, the limiting air-blowing mechanism includes a mounting cavity plate, which is fixedly mounted on the foot assembly and corresponds to the cover plate respectively. An air pump is installed inside the mounting cavity plate, and the output end of the air pump is fixedly connected to a limiting tube. The end of the limiting tube is nested with the air hole and limits its movement. The present invention also provides a method for using an automatic land surveying and mapping device, comprising the following steps: S1. When using this device, after setting it up at a known location, level the device using the horizontal adjustment mechanism. After inputting the current coordinates and instrument height into the instrument, aim at another known location using the eyepiece and objective lens. A prism can be installed at this location for aiming. After inputting the coordinates and azimuth of this location, take a measurement. Repeat the above operation to obtain point data at different locations. The instrument connects the point data into lines to draw a land topographic map. S2. When the instrument is not in use or has been used and placed in the external environment, the cover pieces are spliced ​​together to form a cover body. The adjacent magnetic strips are attracted and fixed. After the cover plate covers the cover body, the mating edge protrusion matches the top groove to make the cover body stable. S3. When the ambient temperature is too high, the fan starts to exhaust downwards. The airflow flows downwards along the air groove, thereby dissipating heat from the machine body. Dust and impurities attached to the machine body are drawn into the dust collection box with the airflow and are intercepted and filtered by the filter plate. S4. When the cover is opened, it moves downwards, and the air hole engages with the limiting tube. At this time, the air pump is started to blow air into the air box through the limiting tube. The elastic telescopic airbags on both sides begin to expand, causing the slider to push the soft rod and soft cotton brush into the upper space of the filter plate. The soft rod and soft cotton brush will deform in accordance with the curved space when they move. This method is used to clean the dust and impurities intercepted on the filter plate. After the elastic telescopic airbags are reset, the dust brought out by the cleaning will slide down along the inner wall of the cover.

[0014] The technical effects and advantages of this invention are as follows: When the instrument is not in use or has been used and placed in the external environment, the cover pieces are spliced ​​together to form a cover body. The adjacent magnetic strips are attracted and fixed. After the cover plate is placed over the cover body, the mating edge protrusion fits into the top groove to make the cover body stable. This method is used to protect the machine components and prevent the external environment from contaminating the machine body. When the ambient temperature is too high, the fan starts to exhaust downwards, and the airflow flows downwards along the air groove, thereby dissipating heat from the machine. Dust and impurities attached to the machine are drawn into the dust collection box with the airflow and are intercepted and filtered by the filter plate. This is how the machine achieves its heat dissipation and cleaning functions. When the cover is opened, it moves downwards, and the air vents engage with the limiting tube. At this time, the air pump is activated to blow air into the central air box through the limiting tube. The elastic telescopic airbags on both sides begin to expand, causing the slider to push the soft rod and soft cotton brush into the upper space of the filter plate. The soft rod and soft cotton brush deform in accordance with the curved space during movement, thus cleaning the dust and impurities intercepted on the filter plate. After the elastic telescopic airbags return to their original position, the dust carried out by the cleaning will slide down along the inner wall of the cover. This method achieves the cleaning effect on the filter plate. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the body component structure of the present invention; Figure 3 This is a schematic diagram of the eyepiece structure of the present invention; Figure 4 This is a schematic diagram of the protective mechanism structure of the present invention; Figure 5 This is a schematic diagram of the dust collection box structure of the present invention; Figure 6 This is a schematic diagram of the structure at the pores of the present invention; Figure 7 This is a schematic diagram of the structure of the cover sheet of the present invention when it is lowered; Figure 8 This is a schematic diagram of the limiting air blowing mechanism of the present invention.

[0016] The attached figures are labeled as follows: 1. Body assembly; 101. Base plate; 102. Horizontal adjustment mechanism; 103. Mounting plate; 104. Body; 105. Front display screen; 106. Horizontal control screw; 107. Vertical control screw; 108. Body component; 109. Objective lens; 110. Handle; 111. Rear display screen; 112. Eyepiece; 113. Telescope focusing screw; 2. Tripod assembly; 3. Protective mechanism; 301. Movable groove; 302. Connecting shaft; 30 3. Cover plate; 304. Air groove; 305. Magnetic strip; 306. Top groove; 307. Cover plate; 308. Fitting edge protrusion; 309. Dust collection box; 310. Through groove; 311. Filter plate; 312. Fan; 313. Soft cotton brush; 314. Rail groove; 315. Middle air box; 316. Elastic telescopic airbag; 317. Slider; 318. Flexible rod; 319. Air hole; 4. Limiting air blowing mechanism; 401. Mounting cavity plate; 402. Air pump; 403. Limiting tube. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The automatic land surveying and mapping equipment and method involved in the present invention are not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Reference Figure 1 The present invention provides an automatic land surveying and mapping equipment and method, including a body assembly 1, a tripod assembly 2 installed at the bottom of the body assembly 1, a protective mechanism 3 provided on the outside of the body assembly 1, and a limiting air blowing mechanism 4 installed on the tripod assembly 2. When the device is in use, the body component 1 is placed on the measurement point by the tripod assembly 2. The staff uses the body component 1 to survey and map the land. When the body component 1 is not in use or after use, the protective mechanism 3 can protect the body component 1 to prevent it from being contaminated by the external environment. After the protective mechanism 3 is opened, the limiting air blowing mechanism 4 is used to limit the protective mechanism 3.

[0019] Reference Figure 2 and Figure 3 The body assembly 1 includes a base plate 101, a tripod assembly 2 installed at the bottom of the base plate 101, a horizontal adjustment mechanism 102 installed on the base plate 101, a mounting plate 103 installed on the horizontal adjustment mechanism 102, a body 104 installed on the mounting plate 103, a front display screen 105 provided on the front side of the body 104, a horizontal control screw 106 provided on the body 104, a vertical control screw 107 provided on the body 104, a body component 108 installed in the body 104, an objective lens 109 installed on the front side of the body component 108, and a handle 110 provided at the upper end of the body 104. The rear display screen 111 is provided on the rear side of the body 104, and the eyepiece 112 is installed on the rear side of the body component 108. The eyepiece 112 is provided with a telescope focusing screw 113. When using this device, after setting it up at a known location, the device is leveled using the horizontal adjustment mechanism 102. After inputting the current coordinates and instrument height into the instrument, the eyepiece 112 and objective lens 109 are used to aim at another known location. A prism can be installed at this location for aiming. After inputting the coordinates and azimuth of this location, the measurement is performed. By repeating the above operation, point data at different locations can be obtained. The instrument connects the point data into lines to draw a land topographic map. Since the above-described workflow is existing technology known to those skilled in the art, its surveying principles and structural details will not be described in detail in this embodiment.

[0020] Reference Figures 4-6 The protective mechanism 3 includes a movable groove 301, which is opened on the base plate 101. Connecting shafts 302 are installed on both sides of the movable groove 301. Cover plates 303 are movably installed on the movable groove 301 through the connecting shafts 302. The cover plates 303 are spliced ​​together to form a complete cover. The body assembly 1 is located in the cover. The cover plates 303 are provided with evenly distributed air grooves 304. Magnetic strips 305 are installed on the sides of the cover plates 303. When the cover plates 303 are spliced, they are attracted by adjacent magnetic strips 305. The upper end of the cover plates 303 is provided with a top groove 306. The cover plates 303 are also provided with a cover plate 307. The bottom of the cover plate 307 is provided with a mating edge protrusion 308. After the air grooves 304 are spliced ​​together, the mating edge protrusion 308 and the top groove 306 are mated together. Dust collection boxes 309 are installed at the bottom of the inner walls on both sides of the cover 303. A through groove 310 is opened at the upper end of the dust collection box 309. A filter plate 311 is fixedly installed in the dust collection box 309. A fan 312 is installed at the bottom of the dust collection box 309. An opening is provided on the upper side of the filter plate 311 near the inner position. A soft cotton brush 313 is movably sleeved at the opening. A rail groove 314 is opened on the inner wall of the cover 303. A middle air box 315 is fixedly installed in the rail groove 314. Elastic telescopic airbags 316 are symmetrically installed on both sides of the middle air box 315. A slider 317 is installed on the outer end of each elastic telescopic airbag 316. The slider 317 is movably sleeved in the rail groove 314. A flexible rod 318 is connected between the slider 317 and the soft cotton brush 313. An air hole 319 is opened on the cover 303. The air hole 319 communicates with the middle air box 315. When the device is in use, and the instrument is not in use or has been used and placed in the external environment, the cover plates 303 are spliced ​​together to form a cover body, and the adjacent magnetic strips 305 are attracted and fixed. After the cover plate 307 covers the cover body, the mating edge protrusion 308 and the top groove 306 are mated to make the cover body stable. This method is used to protect the machine body component 1 and prevent the external environment from contaminating the machine body. When the ambient temperature is too high, the fan 312 starts to exhaust downwards, and the airflow flows downwards along the air groove 304, thereby dissipating heat from the machine body. Dust and impurities attached to the machine body are drawn into the dust collection box 309 with the airflow and are intercepted and filtered by the filter plate 311. This is how the machine achieves its heat dissipation and cleaning functions.

[0021] Reference Figure 7 and Figure 8 The limiting air-blowing mechanism 4 includes a mounting cavity plate 401, which is fixedly mounted on the bracket assembly 2 and corresponds to the cover plate 303 respectively. An air pump 402 is installed inside the mounting cavity plate 401. The output end of the air pump 402 is fixedly connected to a limiting tube 403. The end of the limiting tube 403 is nested with the air hole 319 and limits its movement. When the device is in use, after the cover 303 is opened, the cover 303 moves downward, and the air hole 319 engages with the limiting tube 403. At this time, the air pump 402 is started to blow air into the air box 315 through the limiting tube 403. The elastic telescopic air bladders 316 on both sides begin to expand, causing the slider 317 to push the soft rod 318 and the soft cotton brush 313 into the upper space of the filter plate 311. When the soft rod 318 and the soft cotton brush 313 move, they will deform in accordance with the curved space. This method is used to clean the dust and impurities intercepted on the filter plate 311. After the elastic telescopic air bladder 316 returns to its original position, the dust brought out by the cleaning will slide down along the inner wall of the cover 303. This method achieves the cleaning effect of the filter plate 311.

[0022] The working principle of this invention is as follows: When using the device, after setting it up at a known location, the device is leveled using the horizontal adjustment mechanism 102. After inputting the current coordinates and instrument height into the instrument, the eyepiece 112 and objective lens 109 are used to aim at another known location. A prism can be installed at this location for aiming. After inputting the coordinates and azimuth of this location, the measurement is performed. By repeating the above operation, point data at different locations can be obtained. The instrument connects the point data into lines to draw a land topographic map. When the instrument is not in use or has been used and placed in the external environment, the cover plates 303 are spliced ​​together to form a cover body, and the adjacent magnetic strips 305 are attracted and fixed. After the cover plate 307 covers the cover body, the mating edge protrusion 308 and the top groove 306 are mated to make the cover body stable. This method is used to protect the machine body component 1 and prevent the external environment from contaminating the machine body. When the ambient temperature is too high, the fan 312 starts to exhaust downwards, and the airflow flows downwards along the air groove 304, thereby dissipating heat from the machine body. Dust and impurities attached to the machine body are drawn into the dust collection box 309 with the airflow and are intercepted and filtered by the filter plate 311. This is how the heat dissipation and cleaning functions are achieved. When the cover 303 is opened, it moves downwards, and the air hole 319 engages with the limiting tube 403. At this time, the air pump 402 is activated to blow air into the air box 315 through the limiting tube 403. The elastic telescopic airbags 316 on both sides begin to expand, causing the slider 317 to push the soft rod 318 and the soft cotton brush 313 into the upper space of the filter plate 311. The soft rod 318 and the soft cotton brush 313 will deform in accordance with the curved space when they move, and the dust and impurities intercepted on the filter plate 311 will be cleaned in this way. After the elastic telescopic airbags 316 are reset, the dust carried out by the cleaning will slide down the inner wall of the cover 303. The cleaning effect of the filter plate 311 is achieved in this way.

[0023] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic land surveying and mapping device, comprising a body assembly (1), wherein a tripod assembly (2) is mounted on the bottom of the body assembly (1), characterized in that: The outer side of the body component (1) is also provided with a protective mechanism (3); The protective mechanism (3) includes a cover (303), which is movably mounted on the body assembly (1); The cover plates (303) are assembled together to form a cover body, and the body assembly (1) is located inside the cover body; The protective mechanism (3) is also provided with a dust collection box (309), which removes dust adhering to the body components (1) inside the cover.

2. The automatic land surveying and mapping equipment according to claim 1, characterized in that: The tripod assembly (2) is also equipped with a limiting air-blowing mechanism (4).

3. The automatic land surveying and mapping equipment according to claim 2, characterized in that: The body assembly (1) includes a base plate (101), the tripod assembly (2) is installed at the bottom of the base plate (101), a horizontal adjustment mechanism (102) is installed on the base plate (101), a mounting plate (103) is installed on the horizontal adjustment mechanism (102), a body (104) is installed on the mounting plate (103), a front display screen (105) is provided on the front side of the body (104), a horizontal control screw (106) is provided on the body (104), a vertical control screw (107) is provided on the body (104), an organic component (108) is installed in the body (104), an objective lens (109) is installed on the front side of the organic component (108), and a handle (110) is provided at the upper end of the body (104).

4. The automatic land surveying and mapping equipment according to claim 3, characterized in that: The rear display screen (111) is provided on the rear side of the fuselage (104), and the eyepiece (112) is installed on the rear side of the body component (108). The eyepiece (112) is provided with a telescope focusing screw (113).

5. The automatic land surveying and mapping equipment according to claim 4, characterized in that: The protective mechanism (3) includes a movable groove (301), which is opened on the base plate (101). Connecting shafts (302) are installed on both sides of the movable groove (301). Cover plates (303) are movably installed on the movable groove (301) through the connecting shafts (302). The cover plates (303) are assembled together to form a complete cover. The body assembly (1) is located in the cover.

6. The automatic land surveying and mapping equipment according to claim 5, characterized in that: The cover (303) has evenly distributed air grooves (304). Magnetic strips (305) are installed on the sides of the cover (303). When the cover (303) is assembled, it is attracted by adjacent magnetic strips (305). The top end of the cover (303) has a top groove (306). The cover (303) is also provided with a cover plate (307). The bottom of the cover plate (307) is provided with a mating edge protrusion (308). After the air grooves (304) are assembled, the mating edge protrusion (308) and the top groove (306) are mated together. Dust collection boxes (309) are installed at the bottom of the inner walls on both sides of the cover (303). The top end of the dust collection box (309) has a through groove (310). A filter plate (311) is fixedly installed in the dust collection box (309). A fan (312) is installed at the bottom of the dust collection box (309).

7. The automatic land surveying and mapping equipment according to claim 6, characterized in that: The filter plate (311) has an opening on its upper inner side, and a soft cotton brush (313) is movably fitted into the opening. The inner wall of the cover plate (303) has a rail groove (314), and a medium air box (315) is fixedly installed in the rail groove (314). Elastic telescopic airbags (316) are symmetrically installed on both sides of the medium air box (315). A slider (317) is installed on the outer end of each elastic telescopic airbag (316), and the slider (317) is movably fitted into the rail groove (314).

8. The automatic land surveying and mapping equipment according to claim 7, characterized in that: A flexible rod (318) is connected between the slider (317) and the soft cotton brush (313). An air hole (319) is provided on the cover (303), and the air hole (319) is connected to the central air box (315).

9. The automatic land surveying and mapping equipment according to claim 8, characterized in that: The limiting air-blowing mechanism (4) includes a mounting cavity plate (401), which is fixedly mounted on the bracket assembly (2) and corresponds to the cover plate (303). An air pump (402) is installed inside the mounting cavity plate (401), and the output end of the air pump (402) is fixedly connected to a limiting tube (403). The end of the limiting tube (403) is nested with the air hole (319) and limits its movement.

10. The method of using an automatic land surveying and mapping equipment according to claim 9, characterized in that, Includes the following steps: S1. When using the device, after setting it up at a known point, use the horizontal adjustment mechanism (102) to level the device. After inputting the current coordinates and instrument height into the instrument, use the eyepiece (112) and objective lens (109) to aim at another known point. A prism can be installed at this point for aiming. After inputting the coordinates and azimuth of this point, take a measurement. Repeat the above operation to obtain point data at different locations. The instrument connects the point data into lines to draw a land topographic map. S2. When the instrument is not in use or has been used and placed in the external environment, the cover (303) is spliced ​​together to form a cover body, the adjacent magnetic strips (305) are attracted and fixed, and the cover plate (307) is covered to cover the cover body. The mating edge protrusion (308) and the top groove (306) are mated to make the cover body stable. S3. When the ambient temperature is too high, the fan (312) starts to exhaust downwards, and the airflow flows downwards along the air groove (304) to dissipate heat from the machine body. The dust and impurities attached to the machine body are drawn into the dust collection box (309) with the airflow and are intercepted and filtered by the filter plate (311). S4. When the cover (303) is opened, the cover (303) moves downward and the air hole (319) engages with the limiting tube (403). At this time, the air pump (402) is started to blow air into the air box (315) through the limiting tube (403). The elastic telescopic airbags (316) on both sides begin to expand, so that the slider (317) pushes the soft rod (318) and the soft cotton brush (313) into the upper space of the filter plate (311). When the soft rod (318) and the soft cotton brush (313) move, they will deform in accordance with the curved space. This method is used to clean the dust and impurities intercepted on the filter plate (311). After the elastic telescopic airbag (316) is reset, the dust brought out by the cleaning will slide down along the inner wall of the cover (303).