CN111813136B - Method for quickly forming extinction type bioaerosol at preset height - Google Patents
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- G05D1/10—Simultaneous control of position or course in three dimensions
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Abstract
The invention discloses a method for quickly forming extinction type bioaerosol at a preset height, which comprises the following steps: determining the time required to form a sheet of the extinction-type bioaerosol; calculating the flying height to be reached by the unmanned aerial vehicle; calculating the spraying flow of the unmanned aerial vehicle spraying device; putting the extinction type biological particles into an extinction type biological particle box of an unmanned aerial vehicle spraying device, and then covering an upper end cover of the extinction type biological particle box; after the unmanned aerial vehicle is controlled to fly to reach the flying height, the posture of the unmanned aerial vehicle is adjusted to enable the spray pipe to be parallel to the plane where the extinction type bioaerosol is located and to be suspended above one side edge of the piece of extinction type bioaerosol; the blower is turned on through remote control and the unmanned aerial vehicle is controlled to fly back and forth between the left side and the right side of the extinction type bioaerosol to be formed into a piece at the flying speed and spray at the spraying flow rate. The invention can quickly form extinction type bioaerosol with certain area, thickness and concentration at a preset height to achieve the aim of extinction.
Description
Technical Field
The invention belongs to the technical field of bioaerosol generation, and particularly relates to a method for quickly forming extinction bioaerosol at a preset height.
Background
The aerosol is formed in the atmosphere and is uniformly distributed, and has an extinction effect so as to attenuate electromagnetic waves with specific wavelengths propagating in the aerosol.
Atmospheric aerosols are primarily derived from the emissions of natural and human activities. Natural sources of aerosols include surface sources, marine sources, atmospheric self-generation, and external space injection. Artificial aerosol is various particles discharged by human activities, including primary particles and secondary aerosol generated by chemical or photochemical reaction of polluted gas, and mainly comes from combustion of fossil fuel, industrial and agricultural production activities and the like. The important functions of atmospheric aerosol in many atmospheric processes, such as visibility, radiation balance, atmospheric electronic characteristics, air pollution and cloud formation, are increasingly paid more and more attention, and the size of aerosol particles is closely related to the optical and electrical characteristics thereof. The aerosol formed by the particles sprayed by the existing method can not be connected into a sheet in the air and form long-time suspension, and can not form extinction type bioaerosol with certain area, thickness and concentration, thereby achieving the aim of extinction.
Disclosure of Invention
The invention aims to provide a method for quickly forming extinction type bioaerosol at a preset height, which can quickly form extinction type bioaerosol with a certain area, thickness and concentration at the preset height so as to achieve the aim of extinction.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for rapidly forming a extinction-type bioaerosol at a predetermined height, the method comprising the steps of:
step one, according to the horizontal direction length s of the extinction type bioaerosol to be formed into a sheet2Unmanned aerial vehicle flight speed v2And the extinction type biological particle descending speed v1Extinction type bioaerosol diffusion velocity v0Determining the time t required to form a sheet of the extinction type bioaerosol0；
Step two, according to the time t needed by the extinction type bioaerosol to be formed into a sheet0Extinction type biological particle descending speed v1And the preset height h' of the edge on the extinction type biological aerosol to be formed into a piece is calculated, and the flying height h to be reached by the unmanned aerial vehicle is calculated;
step three, according to the horizontal direction length s of the extinction type bioaerosol to be formed into a sheet2Extinction type biological particle descending speed v1And the minimum concentration C of the extinction type bioaerosol, and calculating the spraying flow Q of the unmanned aerial vehicle spraying device;
fourthly, filling the extinction type biological particles into an extinction type biological particle box 1 of the unmanned aerial vehicle spraying device, and then covering an upper end cover 2 of the extinction type biological particle box 1;
fifthly, controlling the unmanned aerial vehicle to fly to reach the flying height h, adjusting the posture of the unmanned aerial vehicle to enable the material spraying pipe (6) to be parallel to the plane where the extinction type bioaerosol is to be formed, and hovering the unmanned aerial vehicle above the edge of one side of the aerosol to be formed;
sixthly, turning on the blower 5 through remote control; and controlling the unmanned aerial vehicle to fly back and forth between the left side and the right side of the extinction type bioaerosol to be formed into a sheet at the flying speed v2, and spraying at the spraying flow rate Q.
Further, in the step one, the time t required for forming the extinction type bioaerosol into the sheet is t0Comprises the following steps:
t0＝v1·s2/(v2·v0)；
wherein v is1For extinction type of the falling speed of the biological particles, s2For the horizontal length, v, of the mat-type bioaerosol to be formed into a sheet2For unmanned aerial vehicle flight speed, v0The diffusion speed of the extinction type bioaerosol is obtained.
Further, in the second step, the unmanned aerial vehicle is required to reach the flying height h;
h＝t0·v1+h'；
wherein, t0Time required for formation of a sheet of the extinction type bioaerosol, v1H' is the height of the position where the upper edge of the extinction type biological aerosol to be formed into a sheet is located, for the descending speed of the extinction type biological particles.
Further, in the third step, unmanned aerial vehicle sprinkler sprays flow Q and is:
Q＝k·s2·v1·C；
wherein s is2For the horizontal length, v, of the mat-type bioaerosol to be formed into a sheet1The dropping speed of the extinction type biological particles, C is the minimum concentration of the extinction type biological aerosol, and k is the ratio of the initial time concentration and the ending time concentration of the extinction type biological aerosol formed into a sheet.
Further, the unmanned aerial vehicle spraying device comprises a delustering type biological particle box 1, an air blower 5 and 2 material spraying pipes 6;
the upper end cover 2 of the extinction type biological particle box 1 is connected with an unmanned aerial vehicle rotor wing through an unmanned aerial vehicle rotor wing supporting structure 3; a discharge port 4 at the bottom end of the extinction type biological particle box 1 is connected with an inlet of the air blower 5; the blower 5 is turned on and off by remote control;
two symmetrical outlets 51 of the blower 5 are respectively connected with the 2 material spraying pipes 6; the other end of the material spraying pipe 6 far away from the blower 5 is closed;
a plurality of nozzles 61 are uniformly distributed on the side wall of each material spraying pipe 6 along the axial direction; and an air volume control valve 62 for controlling the spraying flow of the corresponding nozzle 61 to account for the total spraying flow is arranged between every two adjacent nozzles 61.
Further, the unmanned aerial vehicle rotor support structure 3 comprises a bayonet 31, a support arm connecting shaft 32 and 2 unmanned aerial vehicle rotor support arms 34;
the bayonet 31 is arranged on the edge of the upper end cover 2; the support arm connecting shaft 32 is arranged in the middle of the upper end cover 2; the 2 unmanned aerial vehicle rotor wing supporting arms 34 are vertically connected through the supporting arm connecting shaft 32; the 2 unmanned aerial vehicle rotor wing supporting arms 34 are fixed through corresponding bayonets 31;
4 unmanned aerial vehicle rotors are installed respectively on the both ends 33 of 2 unmanned aerial vehicle rotor support arms 34.
Further, the extinction type biological particle box 1 is shaped as a table body with a wide upper part and a narrow lower part.
Further, the structure of the material spraying pipe 6 is a telescopic structure.
Further, the spout 61 is a flat spout;
the long edge of the flat nozzle is parallel to the axial direction of the material spraying pipe 6, and the orientation of the long edge is horizontal.
Further, the shape of the nozzle 61 is a shape with two wide ends and a thin middle, and the two ends are horn-shaped;
the orientation of the trumpet-shaped nozzle is horizontal.
The invention has the beneficial effects that:
the invention passes through the horizontal direction length s of the extinction type bioaerosol to be formed into a sheet2Unmanned aerial vehicle flying speed v2 and extinction type biological particle descending speed v1The diffusion speed v0 of extinction type bioaerosol, the preset height h' of extinction type bioaerosol to be formed into a piece, and the flying height h to be reached by the unmanned aerial vehicle is determined so as to ensure that extinction type bioaerosol with a certain area is formedAerosol of matter; and according to the horizontal length s of the extinction type bioaerosol to be formed into a sheet2Extinction type biological particle descending speed v1Calculating the spraying flow Q of the unmanned aerial vehicle spraying device to ensure that the extinction type bioaerosol with certain thickness and concentration is formed; through the material spraying pipe in the unmanned aerial vehicle spraying device, the spraying flow Q and the flying speed v of the unmanned aerial vehicle are realized2The control of the spraying device achieves uniform spraying, and realizes the rapid formation of the extinction type bioaerosol with certain area, thickness and concentration at the preset height and in the preset time, thereby achieving the aim of extinction; meanwhile, the spraying efficiency is improved, the spraying device is particularly suitable for severe environments, and the cost is low.
Drawings
Fig. 1 is a schematic structural view of an unmanned aerial vehicle spraying device in the invention;
FIG. 2 is a schematic view of a flat spout configuration;
FIG. 3 is a schematic view of a trumpet-shaped nozzle structure;
FIG. 4 is a schematic diagram showing the concentration variation curve of the extinction type bioaerosol after spraying the biological particles;
fig. 5 is a schematic diagram of the positions and flight routes of the extinction type bioaerosol and the unmanned aerial vehicle.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
This example presents a method for the rapid formation of a biological aerosol of extinction type at a predetermined height, comprising the steps of:
step one, according to the horizontal direction length s of the extinction type bioaerosol to be formed into a sheet2Unmanned aerial vehicle flight speed v2And the extinction type biological particle descending speed v1Extinction type bioaerosol diffusion velocity v0Determining the time t required to form a sheet of the extinction type bioaerosol0。
The shorter the diffusion time, the better, because the smoke concentration (i.e. extinction type bioaerosol) is smaller and smaller along with the increase of the time, the extinction performance is weakened, and the nozzles are also consistentAt a certain distance, the concentration of the extinction type bioaerosol formed immediately after spraying is not uniform, and the diffusion time cannot be infinitely small due to the limitation of the flight speed of the unmanned aerial vehicle. In the case of not considering the wind speed, the point where the concentration of the extinction type bioaerosol is the largest after spraying is reduced due to the influence of gravity, and the aerosol is diffused due to the influence of turbulence. Let the extinction type biological particle descending speed be v1m/s, the diffusion velocity v of the extinction type bioaerosol to be formed0m/s, the distance of the back and forth movement of the unmanned aerial vehicle, i.e. the horizontal length s of the aerosol smoke screen (i.e. the sheet of extinction type bioaerosol) to be formed2The flying speed of the unmanned plane is v2m/s, then a single flight time is t2＝s2/v2The distance of the extinction type biological particles is s1＝v1·s2/v2。
In order to ensure that when the unmanned aerial vehicle returns to the starting point, the extinction type bioaerosol formed by spraying extinction type biological particles again can be connected with the extinction type bioaerosol formed by spraying at the point in the previous time to form a whole after diffusion, and the required minimum diffusion time is the time t required by the extinction type bioaerosol to be formed0Comprises the following steps:
t0＝v1·s2/(v2·v0)；
wherein v is1For extinction type of the falling speed of the biological particles, s2For the horizontal length, v, of the mat-type bioaerosol to be formed into a sheet2For unmanned aerial vehicle flight speed, v0The diffusion speed of the extinction type bioaerosol is obtained.
Step two, according to the time t needed by the extinction type bioaerosol to be formed into a sheet0Extinction type biological particle descending speed v1And calculating the flying height h of the unmanned aerial vehicle to be achieved by the preset height h' of the upper edge of the extinction type biological aerosol to be formed into a piece.
The unmanned aerial vehicle of this embodiment will reach flying height h and be:
h＝t0·v1+h'；
wherein the content of the first and second substances,t0time required for formation of a sheet of the extinction type bioaerosol, v1H' is the height of the position where the upper edge of the extinction type biological aerosol to be formed into a sheet is located, for the descending speed of the extinction type biological particles.
Let t0＝2s，v1＝0.5m/s，v0＝0.125m/s，s25m, the flying speed of the unmanned aerial vehicle is v210m/s, over t0The descending distance of the central point of the rear smoke screen is 1m, so that the flying height of the unmanned aerial vehicle can be 1m higher than the height h' of the position where the edge of the extinction type bio-aerosol to be formed is located.
Step three, according to the horizontal direction length s of the extinction type bioaerosol of the product to be formed2Extinction type biological particle descending speed v1And the minimum concentration C of the extinction type bioaerosol, and calculating the spraying flow Q of the unmanned aerial vehicle spraying device.
The unmanned aerial vehicle sprinkler of this embodiment sprays flow Q and is:
Q＝k·s2·v1·C；
wherein s is2For the horizontal length, v, of the mat-type bioaerosol to be formed into a sheet1The extinction type biological aerosol concentration is the minimum extinction type biological particle descending speed, C is the minimum extinction type biological aerosol concentration, k is the ratio of the initial time concentration and the termination time concentration of the formed extinction type biological aerosol, and the termination time aerosol concentration is the minimum aerosol concentration meeting the extinction requirement, so that the extinction type biological aerosol concentration after spraying is guaranteed to still meet the extinction requirement.
When the minimum concentration of the extinction type bioaerosol is C and the vertical length of the extinction type bioaerosol is h', the minimum spraying flow is Qmin＝s2·v1C, actually, the concentration is reduced due to the diffusion of the aerosol after spraying, the normalized concentration change curve of the extinction type bioaerosol after spraying is shown in FIG. 4, and the time t required for forming the extinction type bioaerosol with the vertical length h ″, is3＝h”/v1. Suppose C is 10g/m2H ″, 5m, then t3Control concentration profile of 10sThe graph shows that the concentration after 10s is 0.1, that is, 0.1 times of the initial concentration, and the actual spraying flow rate Q is 10 · s so that the extinction type bioaerosol concentration after 10s still satisfies the extinction requirement2·v1·C＝250g/s。
And step four, filling the extinction type biological particles into an extinction type biological particle box 1 of the unmanned aerial vehicle spraying device, and then covering an upper end cover 2 of the extinction type biological particle box 1.
In this embodiment, unmanned aerial vehicle sprinkler structure refers to fig. 1, including extinction type biological particle case 1, air- blower 5 and 2 material pipes 6 that spout. An upper end cover 2 of the extinction type biological particle box 1 is connected with an unmanned aerial vehicle rotor wing through an unmanned aerial vehicle rotor wing supporting structure 3; a discharge port 4 at the bottom end of the extinction type biological particle box 1 is connected with an inlet of an air blower 5; the blower 5 is turned on and off by remote control; two symmetrical outlets 51 of the blower 5 are respectively connected with 2 material spraying pipes 6; the other end of the spray pipe 6 far away from the blower 5 is closed; a plurality of nozzles 61 are uniformly distributed on the side wall of each material spraying pipe 6 along the axial direction; an air volume control valve 62 for controlling the particle flow rate of the spraying nozzle 61 to be in proportion to the total flow rate is arranged between two adjacent nozzles 61. The air quantity control valve is arranged between adjacent nozzles in a multi-nozzle spraying mode, the flow of each nozzle can be adjusted, sprayed particles are uniform, and the possibility of forming uniform extinction type bioaerosol is provided.
The unmanned aerial vehicle rotor support structure 3 of this embodiment includes bayonet 31, support arm connecting axle 32 and 2 unmanned aerial vehicle rotor support arms 34. The bayonet 31 is arranged at the edge of the upper end cover 2; a support arm coupling shaft 32 is provided in the middle of the upper end cap 2; the 2 rotor support arms 34 of the unmanned aerial vehicle are vertically connected through a support arm connecting shaft 32; the 2 unmanned aerial vehicle rotor wing supporting arms 34 are fixed through corresponding bayonets 31; 4 unmanned aerial vehicle rotors are installed respectively on the both ends 33 of 2 unmanned aerial vehicle rotor support arms 34.
The extinction type biological particle box 1 of the embodiment is a table body with a wide upper part and a narrow lower part, the upper opening is wide, so that extinction type biological particles can be conveniently filled, and the lower opening is narrow, so that the extinction type biological particle box can be conveniently connected with a feeding hole of an air blower.
The structure of the spray tube 6 in this embodiment is a telescopic structure, and when the length in the horizontal direction of the extinction type bioaerosol formed is smaller than the maximum length of the spray tube, the length of the spray tube can be shortened to the length in the horizontal direction of the extinction type bioaerosol; when the length of the extinction type bioaerosol in the horizontal direction is greater than or equal to the maximum length of the material spraying pipe, the length of the material spraying pipe can be adjusted to the maximum length. .
Rotor unmanned aerial vehicle can form decurrent air current in the rotor below when flight, and spouts material pipe 6 to be located the rotor under, in order to reduce the influence that the air current that the rotor formed descends and spreads extinction type bioaerosol, should make extinction type bioaerosol who sprays keep away from the position under the rotor as early as possible, consequently, spout 61 sets up the lateral wall at the spray tube on spouting material pipe 6, and the orientation of spout 61 is the horizontal orientation.
The nozzle 61 of this embodiment may be a flat nozzle, and the long side of the flat nozzle is parallel to the axial direction of the material spraying pipe 6, referring to fig. 2, so as to ensure that the extinction type bioaerosols sprayed from adjacent nozzles can be connected together after diffusion. Because each nozzle is separated by a certain distance, the distance between two adjacent nozzles can be reduced by using the flat shape, the initial shape of the extinction type bioaerosol formed by ejecting the extinction type biological particles is also flat, and the particles ejected by the adjacent nozzles can be quickly connected to form the spatially continuous extinction type bioaerosol. The spraying device can also be in a shape with two wide ends and a thin middle part, and the two ends are in a horn shape, referring to fig. 3, the spraying speed of the extinction type biological particles can be increased, the sprayed extinction type biological particles can be sprayed to the side surface of the spraying pipe at a higher horizontal speed, and the air flow formed by the rotor wing can be kept away as soon as possible.
Fifthly, controlling the unmanned aerial vehicle to fly to reach the flying height h, adjusting the posture of the unmanned aerial vehicle to enable the material spraying pipe 6 to be parallel to the plane where the extinction type bioaerosol is to be formed, and hovering the unmanned aerial vehicle above the edge of one side of the aerosol to be formed;
the present embodiment controls the drone to fly to the desired flying height h and hover over the side edge of the sheet of extinction-type bioaerosol, see fig. 5.
Sixthly, turning on the blower 5 through remote control; and areControlling an unmanned aerial vehicle to fly at a speed v2The extinction type bioaerosol to be formed into a sheet flies back and forth between the left side and the right side, and is sprayed at a spraying flow rate Q.
This embodiment controls unmanned aerial vehicle with airspeed v2The extinction type bioaerosol to be formed into a piece flies back and forth between the left side and the right side, and the flying route of the unmanned aerial vehicle refers to the figure 5.
In actual operation, when the concentration of the extinction type bioaerosol is too light, the air quantity of the air blower 5 is increased; when the concentration of the extinction type bioaerosol is too thick, the air quantity of the air blower 5 is reduced. When the concentration distribution of the extinction type bioaerosol in the vertical direction is not uniform, the back-and-forth movement speed of the unmanned aerial vehicle in the horizontal direction is increased.
The embodiment passes through the horizontal direction length s of the extinction type bioaerosol to be formed2Unmanned aerial vehicle flight speed v2Extinction type biological particle descending speed v1The diffusion velocity v of the extinction type bioaerosol to be formed0Determining the flying height h of the unmanned aerial vehicle to be reached so as to ensure that the extinction type bioaerosol with a certain area is formed; and according to the horizontal direction length s of the extinction type bioaerosol to be formed2Calculating the spraying flow Q of the unmanned aerial vehicle spraying device so as to ensure that the extinction type bioaerosol with certain thickness and concentration is formed; through the material spraying pipe in the unmanned aerial vehicle spraying device, the spraying flow Q and the flying speed v of the unmanned aerial vehicle are realized2The control of the spraying device achieves uniform spraying, and realizes that the extinction type bioaerosol with certain area, thickness and concentration is quickly formed in the preset height and the preset time, thereby achieving the aim of extinction and being beneficial to increasing the attenuation of the electromagnetic wave with specific wavelength transmitted in the extinction type bioaerosol; meanwhile, the spraying efficiency is improved, the spraying device is particularly suitable for severe environments, and the cost is low.
Although the embodiments of the present invention have been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the embodiments of the present invention.
Claims (7)
1. A method for rapidly forming a biological aerosol in extinction form at a predetermined height, said method comprising the steps of:
step one, according to the horizontal direction length s of the extinction type bioaerosol to be formed into a sheet2Unmanned aerial vehicle flight speed v2And the extinction type biological particle descending speed v1Extinction type bioaerosol diffusion velocity v0Determining the time t required to form a sheet of the extinction type bioaerosol0；
In the first step, the time t required for forming the extinction type bioaerosol into the sheet0Comprises the following steps:
t0＝v1·s2/(v2·v0)；
wherein v is1For extinction type of the falling speed of the biological particles, s2For the horizontal length, v, of the mat-type bioaerosol to be formed into a sheet2For unmanned aerial vehicle flight speed, v0The diffusion speed of the extinction type bioaerosol is obtained;
step two, according to the time t needed by the extinction type bioaerosol to be formed into a sheet0Extinction type biological particle descending speed v1And the preset height h' of the edge on the extinction type biological aerosol to be formed into a piece is calculated, and the flying height h to be reached by the unmanned aerial vehicle is calculated;
in the second step, the flying height h of the unmanned aerial vehicle is as follows:
h＝t0·v1+h'；
wherein, t0Time required for formation of a sheet of the extinction type bioaerosol, v1H' is the height of the position of the upper edge of the extinction type biological aerosol to be formed into a piece in order to increase the descending speed of the extinction type biological particles;
step threeAccording to the horizontal length s of the extinction type bioaerosol to be formed into a sheet2Extinction type biological particle descending speed v1And the minimum concentration C of the extinction type bioaerosol, and calculating the spraying flow Q of the unmanned aerial vehicle spraying device;
in the third step, unmanned aerial vehicle sprinkler sprays flow Q and is:
Q＝k·s2·v1·C；
wherein s is2For the horizontal length, v, of the mat-type bioaerosol to be formed into a sheet1The dropping speed of the extinction type biological particles is C, the minimum concentration of the extinction type biological aerosol is C, and k is the ratio of the initial time concentration and the ending time concentration of the extinction type biological aerosol formed into a sheet;
fourthly, filling the extinction type biological particles into an extinction type biological particle box (1) of the unmanned aerial vehicle spraying device, and then covering an upper end cover (2) of the extinction type biological particle box (1);
fifthly, controlling the unmanned aerial vehicle to fly to reach the flying height h, adjusting the posture of the unmanned aerial vehicle to enable the material spraying pipe (6) to be parallel to the plane where the extinction type bioaerosol is to be formed, and hovering the unmanned aerial vehicle above the edge of one side of the aerosol to be formed;
sixthly, turning on the blower (5) through remote control; and controlling the unmanned aerial vehicle to fly at the flying speed v2The extinction type bioaerosol to be formed into a sheet flies back and forth between the left side and the right side, and is sprayed at a spraying flow rate Q.
2. The method according to claim 1, characterized in that the unmanned aerial vehicle spraying device comprises a delustring type biological particle box (1), a blower (5) and 2 spraying pipes (6);
the upper end cover (2) of the extinction type biological particle box (1) is connected with an unmanned aerial vehicle rotor wing through an unmanned aerial vehicle rotor wing supporting structure (3); a discharge port (4) at the bottom end of the extinction type biological particle box (1) is connected with an inlet of the air blower (5); the blower (5) is turned on and off by remote control;
two symmetrical outlets (51) of the blower (5) are respectively connected with the 2 material spraying pipes (6); the other end of the material spraying pipe (6) far away from the blower (5) is closed;
a plurality of nozzles (61) are uniformly distributed on the side wall of each material spraying pipe (6) along the axial direction; an air volume control valve (62) for controlling the spraying flow of the corresponding nozzle (61) to account for the proportion of the total spraying flow is arranged between every two adjacent nozzles (61).
3. The method according to claim 2, wherein the drone rotor support structure (3) comprises a bayonet (31), a support arm connection shaft (32) and 2 drone rotor support arms (34);
the bayonet (31) is arranged at the edge of the upper end cover (2); the support arm connecting shaft (32) is arranged in the middle of the upper end cover (2); the 2 unmanned aerial vehicle rotor wing supporting arms (34) are vertically connected through the supporting arm connecting shaft (32); the 2 unmanned aerial vehicle rotor wing supporting arms (34) are fixed through corresponding bayonets (31);
4 unmanned aerial vehicle rotor install respectively on both ends (33) of 2 unmanned aerial vehicle rotor support arms (34).
4. The method according to claim 2, wherein the box (1) is shaped as a table with a wide top and a narrow bottom.
5. Method according to claim 2, characterized in that the structure of the spray pipe (6) is a telescopic structure.
6. Method according to claim 2, characterized in that the spout (61) is a flat spout;
the long edge of the flat nozzle is parallel to the axial direction of the material spraying pipe (6), and the orientation of the long edge is horizontal.
7. The method according to claim 2, wherein the shape of the spout (61) is a shape which is wide at both ends and thin in the middle, and both ends are trumpet-shaped;
the orientation of the trumpet-shaped nozzle is horizontal.
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