JP5700796B2 - Unmanned helicopter chemical spraying device - Google Patents

Description

  The present invention relates to a chemical liquid spraying device mounted on an unmanned helicopter.

  2. Description of the Related Art Conventionally, a technique of a chemical solution spraying device for mounting a chemical solution spraying device on an unmanned helicopter and performing spraying of the chemical solution in the air is known. For example, a chemical spraying device in Patent Document 1 is provided with a pair of left and right chemical tanks on a machine body, a support arm (boom) protruding from the machine body to the left and right sides, an atomizer spraying device arranged at the tip of the boom, and a pump. An unmanned helicopter chemical spraying device is disclosed in which a chemical liquid in a chemical tank is sucked and discharged from an atomizer spray device.

Japanese Patent Laid-Open No. 11-138068

  However, in the atomizer spray device of Patent Document 1, since the chemical liquid is discharged from the chemical liquid supply nozzle toward the drive shaft, the chemical liquid is discharged to the left and right sides or discharged to the drive shaft side. However, the chemical solution may not be uniformly dispersed and sprayed with the mist (particles) being unevenly distributed. There was a problem that.

The present invention has been made in view of the above situation, and provides an unmanned helicopter chemical solution spraying device that can further atomize the chemical solution discharged from the atomizer spraying device and spray it uniformly.

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

The present invention provides a chemical solution spraying device comprising a chemical solution tank that stores a chemical solution, a pump that pumps the chemical solution sucked from the chemical solution tank, and an atomizer spraying device that atomizes and sprays the chemical solution discharged from the pump. The atomizer spraying device includes a chemical liquid supply nozzle that discharges the chemical liquid sent from the pump, a disk that receives the chemical liquid discharged from the chemical liquid supply nozzle and scatters it in the outer peripheral direction by centrifugal force, and a disk that supports the chemical liquid supply nozzle. A cover that covers the top of the disk, a drive source that rotationally drives the disk, and a dispersion guide that is disposed between the discharge port of the chemical liquid supply nozzle and the rotational drive shaft of the disk to disperse the discharged chemical liquid, The dispersion guide is composed of a rod having a substantially triangular shape in a plan sectional view, and the dispersion guide extends downward from the inner surface of the cover. The guide is arranged so that one vertex of the substantially triangular shape in a plan sectional view is directed toward the chemical solution supply nozzle side, and the one vertex is on a line connecting the center line of the chemical solution supply nozzle and the axis of the drive shaft. Is to be placed .

  As effects of the present invention, the following effects can be obtained.

In the present invention, the chemical liquid discharged from the chemical liquid supply nozzle hits the dispersion guide and is dispersed. Therefore, since the chemical liquid discharged from the chemical liquid supply nozzle is diffused on the disk, atomization of the chemical liquid can be promoted, and the dispersion of the particles of the chemical liquid to be sprayed can be reduced.

Further , the chemical liquid discharged from the chemical liquid supply nozzle is divided on both sides of the rotational drive shaft of the disk and dispersed on the outer peripheral side of the disk.

Therefore, the chemical liquid discharged from the chemical liquid supply nozzle can be evenly dispersed on the disk.

The side view which shows the whole structure of the unmanned helicopter carrying the chemical | medical solution spraying apparatus of the unmanned helicopter of this invention. The top view which shows the whole structure of the unmanned helicopter carrying the chemical | medical solution spraying device of the unmanned helicopter of this invention. (A) Front sectional drawing of an atomizer spraying apparatus. (B) An enlarged front sectional view in the vicinity of the dispersion guide. (A) XX sectional drawing in Fig.3 (a). (B) The expanded sectional view of the dispersion guide vicinity in FIG. 3 (a). The piping system figure of the chemical | medical solution spraying apparatus of the unmanned helicopter of this invention.

  First, the whole structure of the unmanned helicopter 1 which mounts the chemical | medical solution spraying apparatus 5 which concerns on this invention is demonstrated. In the following description, the direction of the arrow A shown in FIG. 1 is defined as the front of the unmanned helicopter 1.

  As shown in FIGS. 1 and 2, the unmanned helicopter 1 is mainly composed of a main rotor 3, 3, a tail rotor 4, an engine main body, and a chemical liquid spraying device 5.

  The main rotors 3 and 3 are provided in the upper part of the airframe and can be driven to rotate by an engine (not shown) mounted on the airframe. The main rotors 3 and 3 change the lift applied to the airframe by the rotational drive thereof, so that the airframe is levitated in the air, and the airframe is raised or lowered. The main rotor 3. 3 can change its rotational speed and the inclination formed between the blade surface of the main rotor 3. 3 and the rotation shaft 3 a of the main rotor 3. The main rotors 3 and 3 impart a force for moving in the front-rear direction or the left-right direction to the airframe by tilting the rotation shaft 3 a in the front-rear direction or the left-right direction of the airframe.

  The tail rotors 4 and 4 are provided at the rear part of the airframe and can be driven to rotate by the engine. The tail rotors 4 and 4 have a magnitude of a force that counteracts a reaction torque (force to rotate the machine body in a direction opposite to the direction in which the main rotors 3 and 3 rotate) acting on the machine body by the rotation of the main rotors 3 and 3. Is changed so that the aircraft turns right or left, or the direction of the nose is held in a substantially constant direction. The tail rotors 4 and 4 can change the rotation speed and the inclination formed by the blade surfaces of the tail rotors 4 and the rotation axis of the tail rotors 4 and 4.

  The chemical spraying device 5 is provided on both the left and right sides and the lower part of the machine body. The chemical solution spraying device 5 is a device for spraying a liquid chemical solution in the air from an unmanned helicopter 1 in flight toward a field or the like.

  Hereinafter, the configuration of the chemical solution spraying device 5 will be described.

  As shown in FIGS. 1, 2 and 5, the chemical spraying device 5 includes a frame 51, a pair of left and right chemical tanks 52L and 52R, a pair of left and right pumps 53L and 53R, and a pair of left and right booms 54L and 54R. The spraying device 55, a pair of left and right orifices 66L and 66R, and a three-way cock 64 are mainly configured.

  The frame 51 is a member that fixes other parts constituting the chemical solution spraying device 5 to the machine body. The frame 51 is disposed from the lower part of the aircraft to the left side and the right side of the aircraft, and is detachably attached to the aircraft.

  The pair of left and right chemical liquid tanks 52L and 52R are containers for storing a chemical liquid. The pair of left and right chemical liquid tanks 52L and 52R are disposed in proximity to the left side and the right side of the machine body, and are detachably attached to the machine body via a frame 51.

  The pair of left and right pumps 53L and 53R pumps the chemical liquid stored in the pair of left and right chemical liquid tanks 52L and 52R, respectively. The pumps 53L and 53R are gear pumps, are connected to a motor (not shown), and are driven by the motor. However, the pumps 53L and 53R are not limited to gear pumps, and may be constituted by vane pumps, plunger pumps, or the like.

  The pair of left and right booms 54L and 54R are provided so as to extend horizontally from the frame 51 at the lower part of the body in the left-right direction and project outward from the body. The pair of left and right booms 54L and 54R are in a posture of projecting outward from the left and right sides of the aircraft when the chemical solution is sprayed in the air by the chemical solution spraying device 5, and are rotated upward when the unmanned helicopter 1 is transported when the chemical solution is not sprayed. The storage posture is set along the side surface of the machine body. The pair of left and right booms 54L and 54R are provided with rotation angle adjusting parts 50L and 50R in the middle in the longitudinal direction. By adjusting the rotation angle adjusting portions 50L and 50R, the tip ends (the outer end portions of the fuselage) of the booms 54L and 54R are vertically moved with respect to the base portions (the inner end portions of the fuselage) of the booms 54L and 54R in the horizontal state It can be rotated.

  The spraying device 55 is a device that sprays the chemical solution supplied from the pair of left and right chemical solution tanks 52L and 52R. The spray device 55 is mainly composed of a pair of left and right atomizer spray devices 55L and 55R and a center nozzle 55C.

  The pair of left and right atomizer spraying devices 55L and 55R are atomizer type chemical spraying devices, and each is attached to the tip (outer end of the body) of the pair of left and right booms 54L and 54R. The center nozzle 55 </ b> C is a nozzle type chemical spraying device, and is attached to the center portion of the frame 51 facing downward.

  As shown in FIG. 2, the atomizer spray devices 55L and 55R are disposed at the outer ends of the booms 54L and 54R. Since the atomizer spray devices 55L and 55R have the same configuration on the left and right, the left atomizer spray device 55L will be described.

  As shown in FIG. 3, the atomizer spraying device 55 </ b> L mainly includes an attachment stay 71, a motor 72, a disk 78, a cover 80, a multi-layer disk 81, and a chemical solution supply nozzle 82.

  The attachment stay 71 is a member fixed to the outer end of the boom 54L and for attaching the atomizer spraying device 55L. The mounting stay 71 is formed to be bent in a substantially L shape in sectional view, the vertical portion is fixed to the tip of the boom 54L, the motor 72 is fixed to the upper surface of the horizontal portion, and the spraying portion is attached to the lower surface of the horizontal portion. .

  The motor 72 is for rotating the disk 78. The output shaft 74 of the motor 72 protrudes downward through a through hole opened in the horizontal portion of the mounting stay 71. A drive shaft 75 is fixed to the output shaft 74 on a concentric extension. The drive shaft 75 is a rotational drive shaft of the disk 78. The motor 72 is protected by a cover 73 fixed to the mounting stay 71.

  A center portion of the disk 78 is fixed to the lower end of the drive shaft 75 by a bolt 79. The drive shaft 75 is rotatably supported on the cover 80 via bearings 76 and 76. An umbrella-attached collar 77 is fixed in the middle of the drive shaft 75.

  The collar 77 with an umbrella prevents the chemical liquid from flowing upward and entering the bearing 76 side when the chemical liquid is discharged and sprayed below the cover 80. The insertion portion of the drive shaft 75 in the disk 78 is formed in a spline shape and is configured so as not to rotate relative to the disk 78.

  The disk 78 is driven to rotate by the motor 72, and the chemical solution that has flowed down to the upper surface of the disk 78 is discharged and dispersed by flowing in the outer peripheral direction by the centrifugal force caused by the rotation. On the upper surface on the outer peripheral side of the disk 78, a stacked ring-shaped multi-layer disk 81 is fixed with screws.

  Further, an umbrella-shaped cover 80 is fixed on the mounting stay 71 side above the multi-layer disk 81. A chemical solution supply nozzle 82 is inserted into and fixed to the cover 80 from the outside. The chemical liquid supply nozzle 82 is disposed such that its axis, that is, the discharge direction of the chemical liquid supply nozzle 82 faces the drive shaft 75. A dispersion guide 83 is disposed inside the cover 80 and between the tip of the chemical liquid supply nozzle 82 (the discharge port of the chemical liquid supply nozzle 82) and the drive shaft 75.

  The dispersion guide 83 disperses the chemical liquid discharged from the chemical liquid supply nozzle 82 to the left and right. As shown in FIG. 3, the dispersion guide 83 extends downward from the inner surface of the cover 80. In this embodiment, it is detachably fixed with screws from below. As shown in FIG. 4, the dispersion guide 83 is formed of a rod material having a substantially triangular shape in a plan sectional view. Specifically, as shown in FIG. 4B, the dispersion guide 83 is configured in a substantially isosceles triangle shape in cross-sectional view, and the side from the one vertex 83a to the vertices 83b and 83b on both sides is concaved toward the center side. It is formed into a shape. One vertex 83 a and the center 83 c are disposed on a line connecting the center line of the chemical solution supply nozzle 82 and the axis of the drive shaft 75. However, the position of one vertex 83a of the dispersion guide 83 is decentered to the downstream side of the rotation of the disk 78, or the angle of the upstream side and the downstream side of the disk 78 is different. The chemical solution is scattered from the outer periphery of the disk 78 such that the curvature radius of the curve is different between the left and right so that a large amount of the chemical is discharged downstream in the rotation direction of the disk 78 with respect to the axis of the drive shaft 75. It is also possible to configure so that the amount of time is substantially uniform over the entire circumference of the disk 78.

  By configuring the dispersion guide 83 in this way, as shown in FIG. 4B, the chemical liquid discharged from the chemical liquid supply nozzle 82 hits one vertex 83a of the dispersion guide 83 and is divided into left and right parts. It is guided to both sides of the dispersion guide 83 along the sides extending from 83a to the apexes 83b and 83b on both sides, and is scattered on the upper surfaces of the disks 78 on both sides of the drive shaft 75. Therefore, compared with the case where the chemical liquid discharged from the chemical liquid supply nozzle 82 hits the drive shaft 75 and is dispersed, the spread of the chemical liquid is increased and the degree of dispersion of the chemical liquid can be increased. That is, since the chemical solution spreads over the entire circumference of the disk 78 and the action of the multi-layer disk 81 is added, a mist of chemical solution particles with little variation can be generated, so that the chemical solution can be uniformly spread and sprayed. The other end of the chemical solution supply nozzle 82 is connected to the left and right supply pipe 61 via an orifice 66L described later, and is connected to the pump 53L. That is, the chemical liquid fed from the pump 53L is supplied to the chemical liquid supply nozzle 82 via the left and right supply pipes 61 and the orifice 66L.

  As shown in FIG. 3, a multi-layer disk 81 is provided around the lower part of the umbrella-shaped cover 80 so as to be covered with the cover 80. A gap is provided between the stacked disks 81 so that the chemical solution can be diffused. For this reason, the chemical liquid supplied to the atomizer spraying devices 55L and 55R is discharged from the chemical liquid supply nozzle 82, hits the dispersion guide 83, is divided in two directions, scatters to the outer peripheral side of the disk 78, and the multi-layer disk 81 To. Then, the disk 78 is rotationally driven by the power of the motor 72 to be introduced into the gap between the disks of the multi-layer disk 81 provided on the circumferential portion of the disk 78, and the chemical solution is further atomized, It is discharged from the gap to the outside by centrifugal force. With the above-described configuration, the chemical liquid discharged from the chemical liquid supply nozzle 82 has a small droplet diameter, so that the performance of attaching the chemical liquid released from the atomizer spraying devices 55L and 55R to the crop is improved.

  As described above, the chemical liquid tanks 52L and 52R for storing the chemical liquid, the pumps 53L and 53R for pumping the chemical liquid sucked from the chemical liquid tanks 52L and 52R, and the chemical liquid discharged from the pumps 53L and 53R are atomized and dispersed. In the chemical solution spraying device 5 including the atomizer spraying devices 55L and 55R, the atomizer spraying devices 55L and 55R discharge the chemical solution supplied from the pumps 53L and 53R and the chemical solution supply nozzle 82. A disc 78 that receives the chemical solution and scatters it in the outer peripheral direction by centrifugal force; a cover 80 that supports the chemical solution supply nozzle 82 and covers the upper portion of the disc 78; , Disposed between the discharge port of the chemical liquid supply nozzle 82 and the rotational drive shaft 75 of the disk 78, And a dispersion guide 83 that disperses the discharged chemical liquid. The chemical liquid discharged from the chemical liquid supply nozzle 82 strikes the dispersion guide 83 and is dispersed and the atomization is promoted by the diffusion of the chemical liquid. Particle variation can be reduced.

  Further, the dispersion guide 83 is formed in a substantially triangular shape in cross section, and one vertex is arranged toward the chemical solution supply nozzle 82 side, so that the discharged chemical solution is divided on both sides of the drive shaft and is applied to the disk 78. It is dispersed on the outer peripheral side and can be dispersed evenly.

  As shown in FIG. 5, the three-way cock 64 has one inlet 64a, two outlets 64b and 64c, and a valve body (not shown). The three-way cock 64 is configured such that a chemical solution can be discharged from either one of the two outlets 64b and 64c by rotating and switching the valve body. The valve body is connected to the output shaft of the motor 65 and is rotated by driving the motor 65 to switch the discharge direction of the chemical liquid. In the three-way cock 64 of this embodiment, the inlet 64a is connected to the chemical tanks 52L and 52R, one outlet 64b is connected to a pair of left and right atomizer sprayers 55L and 55R, and the other outlet 64c is connected to the center nozzle 55C. Thus, the discharge of the chemical solution from the atomizer spray devices 55L and 55R and the discharge of the chemical solution from the center nozzle 55C can be selected.

  Next, the piping configuration of the chemical solution spraying device 5 will be described.

  As shown in FIG. 5, the piping in the chemical spraying device 5 includes a pair of left and right supply pipes 57L and 57R, a merging pipe 58, a water absorption side pipe 59, a discharge side pipe 60L and 60R, a left and right supply pipe 61, The main supply pipe 62 is mainly configured.

  One end of the supply pipe 57L is connected to the bottom of the chemical liquid tank 52L. One end of the supply pipe 57R is connected to the bottom of the chemical liquid tank 52R. The other ends of the supply pipes 57L and 57R are joined together and connected to one end of the join pipe 58.

  A line filter 70 is provided at an appropriate location (for example, midway) of the merge pipe 58. The line filter 70 is for preventing clogging of piping by filtering dust and particulates mixed in the chemical solution. The chemical solution supplied from the pair of left and right supply pipes 57L and 57R and joined at one place is joined. When passing through the pipe 58, dust and particulate matter mixed in the chemical solution are filtered. As described above, the chemical liquid is filtered by one line filter 70 with respect to the left and right chemical liquid tanks 52L and 52R (two chemical liquid tanks), thereby reducing the number of filters and shortening the length of the pipe. Therefore, the number of parts and cost can be reduced, the configuration and assembly work of the piping can be simplified, and the trouble of cleaning and maintenance of the filter and piping can be reduced.

  The line filter 70 is detachably provided in the middle part of the merge pipe 58. In other words, couplers or the like are provided on both the inlet side 70a and the outlet side 70b of the line filter 70 so that the line filter 70 can be easily attached and detached, and the line filter 70 can be easily cleaned and the elements can be easily replaced. . Furthermore, since the piping between the chemical liquid tanks 52L and 52R and the pumps 53L and 53R can be shortened, the location where the air pool is generated can be reduced, and the air biting can be prevented, and the water absorption of the pumps 53L and 53R is improved. As a result, it is not necessary to provide an air vent cock for water absorption.

  The water absorption side pipes 59 and 59 are pipes branched from the other end of the merge pipe 58 and connected to the pair of left and right pumps 53L and 53R. That is, one end of the water suction side pipes 59 and 59 is connected to the other end of the merge pipe 58, and the other end of the water suction side pipes 59 and 59 is connected to the water suction port of the left pump 53L and the water suction port of the right pump 53R. Each is connected.

  The discharge side pipes 60L and 60R are pipes connected to the discharge ports of the pair of left and right pumps 53L and 53R and one end of the discharge side merging pipe 67. One ends of the discharge side pipes 60L and 60R are connected to the discharge ports of the pumps 53L and 53R, respectively. The other ends of the discharge side pipes 60 </ b> L and 60 </ b> R are joined at one place and connected to one end of the discharge side join pipe 67.

  The discharge side merging pipe 67 is connected to the merging portion of the discharge side pipes 60L and 60R and one end (inlet 64a) of the three-way cock 64. A drain / drip device 63 is provided at an appropriate location of the discharge side joining pipe 67. The drain / drip device 63 evaporates the moisture of the leaked chemical liquid.

  The left and right supply pipe 61 is a pipe that connects the outlet 64b of the three-way cock 64 and the atomizer spray devices 55L and 55R. One end of the left and right supply pipe 61 is connected to the outlet 64b of the three-way cock 64, and the other end of the left and right supply pipe 61 is branched in the left and right directions in the middle, and one is left atomizer spraying device 55L via the left orifice 66L. The other is connected to the right atomizer spraying device 55R via the right orifice 66R. The left and right orifices 66L and 66R adjust the discharge pressure of the chemical solution from the atomizer spray devices 55L and 55R. And the discharge pressure of the said chemical | medical solution is changed by changing the hole diameter of the passage hole in said orifice 66L * 66R.

  The central supply pipe 62 is a pipe that connects the outlet 64c of the three-way cock 64 and the center nozzle 55C. One end of the central supply pipe 62 is connected to the outlet 64c of the three-way cock 64, and the other end is connected to the center nozzle 55C.

  In such a configuration, when a chemical solution spraying operation is performed, first, the chemical solution spraying by the atomizer spray devices 55L and 55R or the chemical solution spraying by the center nozzle 55C is selected. When the spraying of the chemical solution by the atomizer spray devices 55L and 55R is selected by selecting means such as a wireless device, the motor 65 is driven to switch the three-way cock 64, and the inlet 64a and the outlet 64b are communicated. In this state, the unmanned helicopter 1 is allowed to fly and the pumps 53L and 53R are operated at a desired spraying position, whereby the spraying operation of the chemical solution by the atomizer spraying devices 55L and 55R can be performed. At this time, the chemical liquid is sucked into the pumps 53L and 53R from the chemical liquid tanks 52L and 52R through the supply pipes 57L and 57R, the merging pipe 58, the line filter 70, and the water suction side pipe 59 by driving the pumps 53L and 53R. Then, the chemical liquid is supplied from the discharge ports of the pumps 53L and 53R to the atomizer sprayers 55L and 55R via the discharge side pipes 60L and 60R, the discharge side junction pipe 67, the three-way cock 64, the left and right supply pipes 61, and the orifices 66L and 66R. It is sent and sprayed from the atomizer spraying devices 55L and 55R.

  As described above, the chemical spraying device 5 of the unmanned helicopter 1 includes the chemical liquid tanks 52L and 52R for storing the chemical liquid, the pumps 53L and 53R for pumping the chemical liquid sucked from the chemical liquid tanks 52L and 52R, and the pumps 53L and 53R. In the chemical liquid spraying device 5 provided with atomizer spraying devices 55L and 55R for atomizing the chemical liquid discharged from the sprayer, the atomizer spraying devices 55L and 55R discharge the chemical liquid supplied from the pumps 53L and 53R. 82, a disk 78 that receives the chemical liquid discharged from the chemical liquid supply nozzle 82 and scatters it in the outer circumferential direction by centrifugal force, a cover 80 that supports the chemical liquid supply nozzle 82 and covers the upper side of the disk 78, and the disk 78 A motor 72 (drive source) that rotates, a discharge port of the chemical solution supply nozzle 82, and a disk 78 A dispersion guide 83 for dispersing the chemical liquid to be ejected is disposed between the drive shaft 75 (the rotary drive shaft), but with a.

  By configuring the chemical liquid spraying device 5 of the unmanned helicopter 1 in this way, the chemical liquid discharged from the chemical liquid supply nozzle 82 hits the dispersion guide 83 and is dispersed. Therefore, since the chemical liquid discharged from the chemical liquid supply nozzle 82 is diffused on the disk 78, the atomization of the chemical liquid can be promoted, and the dispersion of the particles of the chemical liquid to be sprayed can be reduced.

  Further, in the chemical liquid spraying device 5 of the unmanned helicopter 1, the dispersion guide 83 is configured in a substantially triangular shape in cross section, and one apex is arranged facing the chemical liquid supply nozzle 82 side.

  By configuring the chemical liquid spraying device 5 of the unmanned helicopter 1 in this way, the chemical liquid discharged from the chemical liquid supply nozzle 82 is divided on both sides of the drive shaft 75 of the disk 78 and dispersed on the outer peripheral side of the disk 78. Therefore, the chemical liquid discharged from the chemical liquid supply nozzle 82 can be evenly dispersed on the disk 78.

DESCRIPTION OF SYMBOLS 1 Unmanned helicopter 5 Chemical solution spraying device 52L Left chemical solution tank 52R Right chemical solution tank 53L Left pump 53R Right pump 55 Spraying device 55L / 55R Atomizer spraying device 72 Motor 75 Drive shaft 78 Disk 80 Cover 82 Chemical solution supply nozzle 83 Dispersion guide

Claims (1)

In a chemical solution spraying device comprising a chemical solution tank for storing a chemical solution, a pump for pumping the chemical solution sucked from the chemical solution tank, and an atomizer spraying device for atomizing and spraying the chemical solution discharged from the pump,
The atomizer spray device is
A chemical supply nozzle for discharging the chemical sent from the pump;
A disk that receives the chemical liquid discharged from the chemical liquid supply nozzle and scatters it in the outer circumferential direction by centrifugal force;
A cover that supports the chemical solution supply nozzle and covers the upper side of the disk;
A drive source for rotating the disk;
A dispersion guide that is disposed between the discharge port of the chemical solution supply nozzle and the rotational drive shaft of the disk and disperses the discharged chemical solution;
The dispersion guide is composed of a substantially triangular bar material in a plan sectional view, and the dispersion guide extends downward from the inner surface of the cover,
The dispersion guide is arranged such that one vertex of the substantially triangular shape in plan sectional view is arranged toward the chemical solution supply nozzle side, and the one vertex connects the center line of the chemical solution supply nozzle and the axis of the drive shaft. An unmanned helicopter chemical spraying device characterized by being arranged on a line .

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