JP6458850B2 - Chemical spraying work vehicle - Google Patents

Description

  The present invention relates to a chemical solution spraying vehicle for spraying a chemical solution stored in a chemical tank to a field.

  Conventionally, a chemical solution spreading boom consisting of a center boom and side booms that can be spread on both sides of the center boom is provided on the front part of the machine body so as to be able to roll freely, and the chemical solution etc. from these spreading booms can be applied to the application targets that are growing in the field. 2. Description of the Related Art A chemical spraying work vehicle that sprays crops is known.

  According to the invention described in Patent Document 1, there is described a chemical solution spraying vehicle that forms an air curtain around the sprayed chemical solution so that the chemical solution does not scatter from the chemical solution spraying region. Moreover, according to invention of patent document 2, the several nozzle for spraying a chemical | medical solution to a spraying boom is provided, and the several blower opening which sprays air is provided in the front and back of this nozzle, or any one side. A chemical spraying work vehicle is described. Furthermore, according to the invention described in Patent Document 3, there is described a chemical liquid spraying work vehicle provided with an air jet opening that forms a downward air curtain around the cabin so that the sprayed chemical liquid does not reach the cabin. .

JP 2009-2014487 A JP 2009-33989 A JP 2009-82003 A

  In an area where a chemical solution having a high concentration is sprayed, the drug spraying work vehicle described in Patent Documents 1 to 3 cannot sufficiently protect the worker from the sprayed chemical solution.

  Then, the subject of this invention is providing the chemical | medical agent spraying work vehicle which can fully protect an operator, even when spraying a high concentration chemical | medical solution.

  The above-described problems of the present invention are solved by the following solution means.

  The invention according to claim 1 is provided with a chemical tank 13 and a fresh water tank 92 on the traveling vehicle body 1, and a spray boom 15 that discharges a chemical liquid sent from the chemical tank 13 downward to the front of the vehicle body from a plurality of chemical spray nozzles 15 a. The mist spraying pipe 93 is connected to the fresh water tank 92, and a plurality of mist sprays for blowing water substantially parallel to the ground from the front to the rear or from the rear to the front of the traveling vehicle body 1 are provided. The chemical solution spraying vehicle is characterized in that the nozzle 94 is provided in a mist ejection pipe 93 disposed in front of the traveling vehicle body 1.

  The invention according to claim 2 is the chemical solution spraying work vehicle according to claim 1, wherein the spray port of the mist spray nozzle 94 is arranged at a position higher than the spray port of the chemical solution spray nozzle 15a.

  According to the third aspect of the present invention, when the control pump 24 that sprays the chemical solution from the chemical solution spray nozzle 15a is turned on and the traveling of the traveling vehicle body 1 is detected by the vehicle speed sensor 90, fresh water is discharged from the mist spray nozzle 94. It is comprised so that it may spread in a mist state, It is a chemical | medical solution spraying work vehicle of Claim 1 or 2.

  According to the first aspect of the present invention, a mist curtain is formed by blowing mist from a plurality of mist (water) spray nozzles 94 in parallel with the ground from the front to the rear or from the rear to the front of the traveling vehicle body 1. As a result, the chemical liquid discharged from the chemical liquid spray nozzle 15a can be prevented from splashing upward, so that the operator can continue the chemical liquid spraying operation safely even for a long time. Further, since the chemical solution discharged from the chemical solution spray nozzle 15a does not scatter upward, the amount of the chemical solution attached to the crop can be improved as compared with the prior art, and the crop yield is also higher than before.

  According to invention of Claim 2, since the sprayed chemical | medical solution and mist curtain do not overlap, mist curtain formation is not inhibited.

  According to the invention of claim 3, since the mist curtain is formed in conjunction with the chemical solution spraying, the mist curtain is reliably formed.

It is a front view of the chemical | medical solution spraying work vehicle of one Example of this invention. It is a side view of the chemical | medical solution spraying work vehicle of FIG. It is a top view of the chemical | medical solution spraying work vehicle of FIG. It is a bottom view of the chemical | medical solution spraying work vehicle of FIG. It is a top view which shows the mission case and pump of the chemical | medical solution spraying work vehicle of FIG. It is a figure explaining the mission case inside of the chemical | medical solution spraying work vehicle of FIG. It is a figure explaining the inside of the bonnet of the chemical | medical solution spraying work vehicle of FIG. It is a figure explaining the structure of the brake of the chemical | medical solution spraying work vehicle of FIG. It is a front view which shows the mode at the time of the spraying operation | work of the chemical | medical solution spraying work vehicle of FIG. It is a side view of the chemical | medical solution spraying work vehicle of one Example of this invention. It is a top view which shows the state which expand | deployed the side boom on the both sides of the center boom of the chemical | medical solution spraying work vehicle of FIG. It is a side view of the front part of the chemical | medical solution spraying work vehicle of one Example of this invention. It is a side view of the chemical | medical solution spraying work vehicle of one Example of this invention. It is a top view of the chemical | medical solution spraying work vehicle of one Example of this invention. It is a side view of the chemical | medical solution spraying work vehicle of one Example of this invention. It is the side view (FIG. 16 (a)) and top view (FIG. 16 (b)) of the chemical | medical solution spraying work vehicle of one Example of this invention. It is a control block diagram of the chemical | medical solution spraying work vehicle of one Example of this invention. It is a top view of the base part of the chemical | medical solution spraying work vehicle of one Example of this invention. It is a side view of the base part of the chemical | medical solution spraying work vehicle of one Example of this invention. It is a side view of the chemical | medical solution spraying work vehicle of one Example of this invention. It is a block diagram which shows the chemical | medical agent spraying piping system of the chemical | medical solution spraying work vehicle of one Example of this invention. It is the side view (FIG.22 (a)) and top view (FIG.22 (b)) of the chemical | medical solution spraying work vehicle of one Example of this invention. It is the side view (FIG. 23 (a)) and top view (FIG. 23 (b)) of the chemical | medical solution spraying work vehicle of one Example of this invention. It is a side view of the front part of the chemical | medical solution spraying work vehicle of one Example of this invention. It is the side view (FIG. 25 (a)) and top view (FIG.25 (b)) of the chemical | medical solution spraying work vehicle of one Example of this invention. 1 is a partially enlarged view of a plan view of a chemical solution spraying vehicle according to an embodiment of the present invention. 1 is a partially enlarged view of a plan view of a chemical solution spraying vehicle according to an embodiment of the present invention. It is a partial enlarged view of the side view of the chemical | medical solution spraying work vehicle of one Example of this invention. It is a partial enlarged view of the side view of the chemical | medical solution spraying work vehicle of one Example of this invention. It is the side view (FIG. 30 (a)) and top view (FIG. 30 (b)) of the chemical | medical solution spraying work vehicle of one Example of this invention.

  Embodiments of the present invention will be described with reference to the drawings.

  A schematic configuration of a chemical solution spraying work vehicle that is a work vehicle according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the forward direction side of the chemical spraying vehicle is referred to as the front side.

  FIG. 1 shows a front view of a chemical spraying work vehicle according to an embodiment of the present invention, and FIG. 2 shows a side view of the chemical spraying work vehicle of FIG.

  A pair of left and right front wheels 2 and rear wheels 3 are provided on the traveling vehicle body 1, and as shown in FIG. 7, a radiator 4, a reserve tank 5 for storing coolant for replenishing the radiator 4, an engine 6, and the like are provided on the front side of the traveling vehicle body 1. And is covered with a bonnet 7.

  A steering handle 8 is provided behind the bonnet 7, and a driver seat 9 is provided behind the steering handle 8. A step 10 is provided below the steering handle 8 and the driver seat 9, and a fuel tank 11, a mission case 12 (FIG. 5) and a pump 24 (FIG. 5) described later are provided below the step 10. The transmission case 12 and the pump 24 are mounted and mounted on a vehicle body frame 18 extending in the front-rear direction.

  A chemical tank 13 for storing a chemical solution is provided behind the driver seat 9, an operation panel 14 is provided on the left and right sides of the driver seat 9, and various operation tools for a chemical spraying operation such as a pump on / off operation lever 17 described later. It has.

  As shown in FIG. 9, the boom 15 for spraying the chemical is spread on both the left and right sides of the traveling vehicle body 1 and sprays the chemical from a large number of nozzles 15a attached to the boom 15 (151 and 152). In FIGS. 1 to 4, the boom 15 is in a retracted state, and is in a rear obliquely upward posture on both the left and right sides of the traveling vehicle body 1.

  Next, the transmission configuration will be mainly described with reference to FIG.

  An input shaft 20 for the power of the engine 6 (FIG. 7) is provided, a main clutch 21 is provided on the upper side of the input shaft 20, and a first gear 22 and a second gear for shifting in the transmission case 12 toward the lower side. A gear 23 is provided. A work output shaft 25 for driving a pump 24 for supplying the chemical solution in the chemical solution tank 13 to the nozzle 15a of the boom 15 is provided on the same shaft center on the further lower side of the second speed change gear 23. The work gear 26 provided on the slide 20 is slid by a shifter 27a to be turned on and off. The shifter 27 a is operated by the pump on / off operating lever 17.

  In the present embodiment, the first shift refers to a so-called main shift, and the second shift refers to a so-called sub shift, but the first shift may be a sub shift and the second shift may be a main shift.

  The first speed change gear 22 includes a high speed gear 28, a low speed gear 29, and a first transmission gear 30, and is configured to idle with respect to the input shaft 20 via a bearing 52. The second speed change gear 23 includes a low speed gear 31, a medium speed gear 32, and a high speed gear 33, and is configured to rotate together with the input shaft 20.

  The shift adjustment shaft 34 provided in parallel with the input shaft 20 is provided with a slidable first shift setting gear 35 and a second shift setting gear 36.

  Also, between the first gear setting gear 35 and the second gear setting gear 36, a first gear low-speed meshing gear 37 that always meshes with the first gear low-speed gear 29, and a second gear speed low-speed gear. A low-speed meshing gear 38 for the second shift that is always meshed with the gear 31 is provided, the low-speed meshing gear 37 for the first shift is configured to rotate together with the shift adjustment shaft 34, and the low-speed meshing gear 38 for the second shift is a gearshift adjustment. In this configuration, the shaft 34 is idled via a bearing 53.

  Further, a reverse gear 39 that rotates together with the shift adjustment shaft 34 is provided at one end of the shift adjustment shaft 34.

  The first shift setting gear 35 includes a high speed unit 40 that sets the first shift to a high speed and a low speed unit 41 that sets the first shift to a low speed. The high speed portion 40 of the first shift setting gear 35 of the present embodiment forms a meshing gear that meshes with the high speed gear 28 of the first shift, and the low speed portion 41 of the first shift setting gear 35 is the first speed change gear 35. A gear receiving portion for fitting with the fitting gear 54 formed integrally with the low speed meshing gear 37 is formed. The first shift setting gear 35 is formed with a reverse gear receiving portion 56 that fits with a fitting gear 55 that is formed integrally with the reverse gear 39.

  The second shift setting gear 36 includes a high speed unit 42 that sets the second shift to a high speed, a medium speed unit 43 that sets the second shift to a medium speed, and a low speed unit 44 that sets the second shift to a low speed. . The high speed portion 42 of the second shift setting gear 36 of the present embodiment forms a meshing gear that meshes with the high speed gear 33 for the second shift, and the middle speed portion 43 of the second shift setting gear 36 is the second speed change gear. A meshing gear that meshes with the high-speed gear 33 is formed, and the low-speed portion 44 of the second shift setting gear 36 is fitted with a gear receiving portion 57 that is formed integrally with the low-speed meshing gear 38 for the second shift. The gear is made.

  The transmission shaft 45 arranged in parallel with the input shaft 20 and the speed change adjusting shaft 34 includes a reverse meshing gear 46 that always meshes with the reverse gear 39, a second transmission gear 47 that always meshes with the first transmission gear 30, and a later-described gear. And a third transmission gear 48 that is transmitted to the traveling output shaft 49. The reverse meshing gear 46, the second transmission gear 47, and the third transmission gear 48 are configured to rotate together with the transmission shaft 45.

  A traveling output shaft 49 provided in parallel with the transmission shaft 45 is provided with a fourth transmission gear 50 and a brake 51 that are always meshed with the third transmission gear 48. The traveling output shaft 49 protrudes outward from the front and rear of the transmission case 12, and forms a front wheel transmission shaft 58 forward and a rear wheel transmission shaft 59 rearward. That is, the chemical solution spraying work vehicle of the present embodiment is a four-wheel drive work vehicle.

  Next, power transmission from the engine 6 to the drive unit will be mainly described with reference to FIG.

  When the input shaft 20 transmitted from the engine 6 (FIG. 7) rotates, the second speed change gear 23 rotates together.

  When the second shift setting lever 36 (FIG. 3) is operated to set the second shift setting gear 36 to any one of low speed, medium speed, and high speed, the rotation of the input shaft 20 is transmitted to the shift adjustment shaft 34. Further, when the first transmission setting gear 35 is operated by the first transmission operation lever 61 (FIG. 3) to set either the low speed or the high speed, the first transmission gear 30 rotates together, and the second transmission gear. The transmission shaft 45 is transmitted to 47 and rotates. When the transmission shaft 45 rotates, the third transmission gear 48 and the fourth transmission gear 50 rotate together, the traveling output shaft 49 rotates, and the traveling wheel moves forward at the set speed.

  When the first shift setting gear 35 is moved backward, the reverse gear 39 and the reverse meshing gear 46 rotate together, and are transmitted to the traveling output shaft 49 via the third transmission gear 48 and the fourth transmission gear 50. The

  By providing the input shaft 20 in the upper part of the mission case 12 and providing the traveling output shaft 49 in the lower part of the mission case 12, it is possible to provide a high installation ground height position while the mission case 12 is compact. A crop that passes below the mission case 12 is unlikely to interfere with the mission case 12, and the work in a smooth field can be performed.

  The input shaft 20, the transmission adjusting shaft 34, the transmission shaft 45, and the traveling output shaft 49 are provided in parallel in the mission case 12. A main clutch 21 is provided in which the upper end of the input shaft 20 is provided so as to protrude outside the transmission case 12. The upper part of the main clutch 21 is covered with a cover 65, and the cover 65 is supported by the input shaft 20 and the transmission case 12.

  The structure inside the bonnet 7 of FIG. 7 will be described. The reserve tank 5 is provided on the front end side of the traveling vehicle body 1 and using the space above the flywheel 62. Therefore, the space can be used effectively and the maintenance such as water supply to the reserve tank 5 is easy.

  The operation configuration of the brake 51 in FIG. 8 will be described.

  The brake 51 is provided in the lower part in the mission case 12 and is operated by depressing a brake pedal 63 provided in step 10. The brake pedal 63 and the brake 51 are connected by a brake rod 64. The brake rod 64 is configured to be supported by the vehicle body frame 18, and the lower end portion of the brake rod 64 is provided higher than the lower end surface of the transmission case 12 to secure the ground height of the traveling vehicle body 1, and below the traveling vehicle body 1. Prevent contact with the passing crop.

  The brake pedal 63 is provided on the left and right sides of the front side of Step 10, and the clutch pedal 64 that operates the main clutch 21 is provided on the left and right sides of Step 10.

  As shown in FIG. 10, the chemical solution spraying vehicle according to an embodiment of the present invention includes a chemical solution tank 13 and a blower 67 on the traveling vehicle body 1, and further supplies a chemical solution sent from the chemical solution tank 13 downward to the front of the vehicle body. A spray boom 15 for discharging from a plurality of chemical spray nozzles 15a is provided, a blower pipe (fan duct) 68 is connected to the blower 67, and air 69 is substantially parallel to the ground from the front to the rear of the traveling vehicle body 1. A plurality of air outlets 68 a to be blown out are provided in a blower pipe 68 disposed in front of the traveling vehicle body 1.

  Although FIG. 10 shows a chemical solution spraying vehicle with a cabin 71, the embodiment of the present invention is also applied to a chemical solution spraying vehicle without a cabin 71.

  The configuration shown in FIG. 10 is provided with an air outlet 68a that blows out air 69 from the front to the rear of the traveling vehicle body 1 in parallel with the ground. Since the chemical liquid discharged from 15a can be prevented from being scattered upward by the air 69, the operator can continue the chemical liquid spraying operation safely even for a long time. Further, since the chemical discharged from the spray nozzle 15a does not scatter upward, the amount of the chemical applied to the crop can be improved as compared with the conventional amount, and the crop yield is also increased as compared with the conventional method.

  In the configuration shown in FIG. 10 above, in a region where a chemical solution such as a high concentration of agricultural chemicals is sprayed, the chemical solution discharged from the chemical solution spray nozzle 15a is sucked by the operator (operator) of the chemical solution spraying vehicle so as not to cause any health damage. It is necessary to have a structure that does not exist.

  Further, as shown in a plan view showing a state in which the side booms 152 are unfolded on both sides of the center boom 151 in FIG. 11, a plurality of air outlets 68 a are provided in the air supply pipes (air supply ducts) 68 disposed in front of the traveling vehicle body 1. It is desirable to provide at intervals. By providing a plurality of air outlets 68a at equal intervals, the air curtain 69a is formed from the plurality of air outlets 68a substantially parallel to the ground from the front to the rear of the traveling vehicle body 1, and is thus scattered by the air curtain 69a. The subsequent chemical liquid is prevented from splashing upward, and the operator can continue the chemical liquid spraying operation safely even for a long time. In addition, the air curtain 69a can reliably prevent the discharged chemical liquid from splashing upward, so that the amount of the chemical liquid attached to the crop can be improved more than before, and the crop yield can be increased more than before.

  As shown in a plan view showing a state in which the side booms 152 are unfolded on both sides of the center boom 151 in FIG. 11, the spray boom 15 is disposed immediately in front of a plurality of air outlets 68 a provided at a plurality of equal intervals in the air supply pipe (air supply duct) 68. A chemical solution spray nozzle 15a may be disposed. The rear area of the chemical solution spraying nozzle 15a during the control operation is an area where the most chemical liquid is scattered, and the air blowout amount 68a is located at that portion, so that the amount of air blown from the nozzle 15a and the air blowout port 68a. Since many regions can be stacked, there is a merit that chemical solution scattering can be suppressed.

  As shown in a plan view showing a state in which the side booms 152 are unfolded on both sides of the center boom 151 in FIG. 11, the air outlets at both ends in a plurality of air outlets 68 a provided in the air blowing pipe (air blowing duct) 68 at equal intervals. The air curtain 69a may be configured such that the air curtain 69a formed by the air blown from the plurality of air blowing ports 68a covers the entire area of the traveling vehicle body 1 at a position substantially in front of the front wheel 2.

  Since the air outlets 68a at both ends in the air outlet 68a are disposed substantially in front of the front wheel 2, there is an effect of further reducing the amount of scattered chemical liquid particles to the operator (operator) of the chemical liquid spraying work vehicle. Further, since the scattered chemical liquid particles are blocked by the air curtain 69a and do not adhere to the traveling vehicle body 1, troubles such as yellowing and paint floating do not occur in the traveling vehicle body 1, so that there is an advantage that the machine lasts longer.

  As shown in the side view of the front part of the chemical solution spraying vehicle in FIG. 12, the air curtain 69a is horizontally oriented toward the rear of the traveling vehicle body provided on the boom link 75 that supports the spraying boom 15 and can lift and lower the spraying boom 15. You may provide the angle adjustment arm 73 which rotates and adjusts the air duct 68 long in the vehicle body width direction of the front side which has the air blowing port 68a to form. FIG. 12 illustrates a case where the air curtain 69 a is formed in the horizontal direction with the air duct 68 facing the rear of the traveling vehicle body 1, and a case where the air curtain 69 a is formed with the air duct 68 facing the rear downward of the traveling vehicle body 1. .

  There are two types of spraying of chemicals, herbicide spraying with large chemical particle size and conventional spraying with small particle size, but with so-called conventional spraying with small particle size, spray chemicals are easily carried in the wind and scattered. It is an advantage that the formation angle of the air curtain 69a can be arbitrarily set according to these chemical spraying modes. For example, in the spraying form of the chemical liquid that is likely to be scattered, it is possible to suppress the chemical liquid scattering by setting the angle of the air curtain 69a to be inclined backward and downward.

  Further, the air outlet 68a that forms the air curtain 69a toward the rear of the traveling vehicle body 1 provided on the boom link 75 is inclined slightly downward rather than horizontally, so that the air curtain 69a is slightly inclined downward. If it is configured to be formed, there is an effect of pressing scattered chemical liquid particles to the crop side, so that the scattered chemical liquid is blocked by the air curtain 69a and falls downward, so that the chemical liquid adheres to the crop. Is further enhanced. In this way, it is possible to obtain an effect of reducing the spraying amount of the chemical solution against the surface.

  If the length of the air 69 blown out to the rear of the traveling vehicle body 1 is short, the chemical liquid particles will slip through from the tip of the air 69, so the effect becomes small. Accordingly, it is important to form an air curtain 69a that secures the air volume so that the air 69 can reach the position closer to the driver seat 9, and to reduce the chemical particles from slipping through the tip of the air curtain 69a.

  A plurality of air outlets 68a for blowing air substantially parallel to the ground from the front to the rear of the traveling vehicle body 1 as shown in the drawings showing the state in which the side booms 152 are deployed on both sides of the center boom 151 in FIGS. Is provided in the blower pipe (duct) 68 in the configuration in which the air curtain 69a is formed by blowing air from the blowout port 68a provided in the blower pipe 68. It is desirable to arrange the outlet 68a near the chemical spray nozzle 15a.

  With such a configuration, the chemical solution does not scatter and has a double effect of improving the adhesion of the sprayed chemical solution to the crop.

  Adhesion of sprayed chemicals to the crop includes primary adhesion in which the chemical discharged from the chemical spray nozzle 15a directly adheres to the crop and secondary adhesion in which the scattered chemical is blocked by the air 69 and falls downward and adheres to the crop. However, with the two chemical solution adhesion effects as described above, there is an advantage that it is possible to reduce the amount of sprayed chemical solution per hit and to reduce production costs.

  As shown in the side view showing the side boom 152 deployed on both sides of the center boom 151 in FIG. 13, the air duct (front) 68 provided with the air outlet 68a of the air 69 is attached to the boom link 75 for raising and lowering the boom. It is also possible to adopt a configuration.

  The height of the chemical spray nozzle 15 may be changed by raising and lowering the boom link 75 according to changes in topography and the like, and the chemical spraying height may be changed according to the difference in crop growth during the work. However, since the height of the air curtain 69a can be changed according to the raising and lowering of the boom link 75, there is an advantage that the shape and angle of the air curtain 69a can be kept constant, and there is no difference in performance in reducing chemical splashes.

  Further, as shown in FIG. 13, when the bellows portion 68b is provided at the front portion of the air duct 68, when the boom link 75 being controlled by the chemical solution is moved up and down by the lift cylinder 76, the air in the air duct 68 is caused by the bellows portion 68b. There is an advantage that the position of the outlet 68a can be easily held in a certain direction.

  As shown in the plan view of the state in which the side boom 152 is deployed on both sides of the center boom 151 in FIG. 14, the positions of both ends of the air outlet 68 a of the air duct 68 are overhanged to be larger than the width dimension of the traveling vehicle body 1. When arranged, both end portions of the air curtain 69a are larger than the width of the traveling vehicle body 1, so that the chemical liquid particles ejected from the chemical spray nozzle 15a attached to the side boom 152 even when receiving wind from diagonally forward during the control work. The possibility of the operator being exposed to the explosion is eliminated.

  Next, countermeasures for reducing chemical exposure in a chemical spraying vehicle with a cabin will be described.

  As shown in a side view showing a state in which the side booms 152 are deployed on both sides of the center boom 151 in FIG. 15, in the chemical solution spraying work vehicle with the cabin 71, the simplified cabin (both sides of the cabin are opened and the cabin rear is also opened. However, there is a problem that the chemical liquid adheres to the windshield 71a in front of the cabin 71 and the chemical liquid cannot be wiped even if the wiper is operated.

  Therefore, in the chemical solution spraying work vehicle provided with the chemical solution spray nozzle 15 in front of the traveling vehicle body 1 shown in FIG. 15, from a plurality of air outlets 68 a of the air duct 68 that is provided immediately after the chemical solution spray nozzle 15 in the vehicle body width direction. By blowing air in the rearward horizontal direction to form an air curtain 69a and combining the air curtain 69a with a windshield 71a provided on the front side of the cabin 71, it is possible to prevent scattering of the chemical liquid particles upward. There is an advantage that the amount of chemical solution attached to the windshield 71a can be reduced, forward visibility can be ensured, and comfortable work can be continued.

  Further, even when the simplified cabin 71 in which the both side portions of the cabin 71 and the rear portion of the cabin 71 are opened without glass is used, the sprayed chemical liquid is less exposed to the operator with the above configuration, and the both sides of the cabin 71 By not providing glass at the rear part of the cabin 71, cost reduction and weight reduction of the cabin 71 can be achieved. In particular, there is a merit in the paddy field control traveling performance by reducing the weight of the traveling vehicle body 1 in the wetland area.

  As shown in the side view of FIG. 16 (a) and the plan view of FIG. 16 (b), the air outlet 68a of the air duct (front) 68 in the foremost row of the boom link 75 and directed perpendicular to the advancing direction of the machine body. Further, it may be a chemical solution spraying work vehicle that is provided toward the front side of the traveling vehicle body 1 and that forms an air curtain 69a in an area on the traveling direction side to perform the control work.

  During the control work, there is a case where the work is received by a tailwind from the rear of the traveling vehicle body 1. In this case, the chemical liquid particles ejected from the chemical liquid spray nozzle 15a ride on the tailwind, and when the majority of the chemical liquid scatters to the front of the nozzle 15a and rises to the sky, the operator may be bombed and cause health damage. . In such a case, as shown in FIG. 16, an air curtain 69a is formed in a region on the traveling direction side to effectively cope with such a case. Moreover, there is also an effect that chemical solution adhesion (secondary adhesion effect) to crops can be enhanced by suppressing scattering of the chemical solution particles.

  In the chemical solution spraying vehicle shown in FIGS. 16 (a) and 16 (b), the air blowing for forming the air curtain 69a from the air outlet 68a of the blower duct 68 and the chemical solution spraying from the chemical spray nozzle 15a are performed simultaneously. Then, there is a merit that safety work can be performed at all times so as not to be exposed to the chemical liquid due to a driver's operation mistake such as forgetting to push the drive switch of the blower 67.

  16 (a) and 16 (b), the air curtain 69a from the air outlet 68a of the blower duct 68 provided toward the front side of the machine body is used for the chemical solution spraying of the foremost chemical solution spray nozzle. It is configured to be formed before and after the region.

  Even though the work is controlled by the tailwind, the chemical solution spatters when it hits the crop, and some chemical particles are scattered behind the chemical spray nozzle. However, the above-described air curtain 69a in FIG. 15 has an advantage of reducing the upward scattering of the chemical liquid scattered backward.

  In the chemical solution spraying vehicle shown in FIGS. 16A and 16B, the chemical solution spray nozzle 15a of the spray boom 15 is disposed immediately before the air outlets 68a provided at a plurality of equal intervals in the blower pipe 68. Also good.

  In general, the front and rear areas of the chemical spray nozzle 15a during the control operation are areas where the most chemical liquid particles are scattered, and by positioning the air outlet 68a of the air 69 at that portion, the chemical liquid particles are generated in the area where the air volume is large. Since it can block, there is a merit that the chemical solution can be suppressed.

  Further, in the chemical solution spraying vehicle shown in FIGS. 16A and 16B, the air outlets 68a at both ends of the air outlets 68a provided in the air blowing pipe 68 at equal intervals are provided on the traveling vehicle body 1. An air curtain 69a formed by the air 69 blown out from the plurality of air blowing ports 68a at a position substantially in front of the front wheel 2 may be configured to cover the entire area of the traveling vehicle body 1.

  In this case, there is an effect that it is possible to further reduce the scattering amount of the chemical liquid particles to the operator, and the scattered chemical liquid particles are blocked by the air curtain 69a and do not adhere to the traveling vehicle body 1, so that problems such as yellowing and paint floating occur. Since it does not occur, there is an advantage that the machine lasts longer.

  16 (a) and 16 (b), in a chemical solution spraying vehicle equipped with a chemical spray nozzle 15 in front of the traveling vehicle body 1, an air duct 68 long in the vehicle body width direction provided immediately after the chemical spray nozzle 15 is provided. Since the air curtain 69a is formed by blowing air in the forward horizontal direction from the plurality of outlets 68a, the chemical liquid particles can be prevented from scattering upward, so that the amount of chemical liquid adhering to the windshield 71a of the cabin 71 can be reduced. There is an advantage that forward visibility can be secured and comfortable work can be continued.

  Further, even when the simplified cabin 71 in which the both side portions of the cabin 71 and the rear portion of the cabin 71 are opened without glass is used, the sprayed chemical liquid is less exposed to the operator with the above configuration, and the both sides of the cabin 71 By not providing glass at the rear part of the cabin 71, cost reduction and weight reduction of the cabin 71 can be achieved. In particular, there is an advantage in paddy field control running performance by reducing the weight of the running body in the wetland area.

  As shown in FIG. 6, the drive transmission unit of the chemical spraying work vehicle, FIG. 18 is a plan view of the base part of the chemical spraying work vehicle, and FIG. 19 is a side view of the base part of the chemical spraying work vehicle. In a chemical spraying work vehicle (also referred to as a control machine) having a blower 67 for forming the transmission, a drive pulley 81 is provided on a transmission upper shaft (a work output shaft for driving the control pump 24), The control pump 24 is driven by a belt 85 wound around a drive pulley 81, the upper shaft (working output shaft) 25 and a drive shaft 82 extending rearward are connected, and the blower 67 is connected to the rear end of the drive shaft 82. Using the mechanical transmission structure of power connected to the driving pulley 86 (FIG. 18) to drive, the pump on / off operating lever 17 is operated. Configured to permitting and blocking power transmission to the drive pulley 81 and the drive pulley 86.

  Conventionally, an electromagnetic clutch (not shown) is internally provided in the driving pulley 81 of the control pump 24 and the blower 67, and the control pump 24 and the blower 67 are simultaneously operated by a switch 80 (FIG. 3) next to the driver seat 9. A configuration for turning on and off is known. However, the above configuration is effective as one means for not forgetting to operate the blower 67 in the control work, but the electromagnetic clutch is expensive and is a factor that presses down the design cost.

  Therefore, the pump on / off operation lever 17 is turned on, and the work gear 26 is moved to the left side in FIG. 6 by the shifter 27 a of the shifter stay 27 to be connected to the high speed gear 33. Thus, engine power is transmitted from the gear 33 to the work output shaft 25 via the gear 26, and the pump 24 can be driven from the work output shaft 25 via the drive pulley 81 and the belt 85. The power from the work output shaft 25 can actuate the blower 67 through the drive shaft 82.

  By adopting such a configuration that is very simple and has a large cost reduction effect, it has been devised so that the control pump 24 and the blower 67 can be driven at the same time. Since there is no forgetting to start or delay of the blower 67, the control work can be performed without worrying about the exposure of the chemical liquid particles.

  An example of the control block diagram of the present invention is shown in FIG.

  In the configuration including the mechanical transmission mechanism shown in FIG. 6, the control pump 24 is driven by the drive pulley 86 (FIG. 18), and the blower 67 is driven by the drive shaft 82.

  Therefore, drive transmission from the engine 6 to the blower 67 is simple and easy, can be configured compactly in terms of space, and has a very rational structure.

  As shown in FIGS. 18 and 19, the control pump 24 is disposed above the work output shaft 25 to which the drive pulley 81 is attached, and is driven by a belt 85. The drive shaft 82 drives the blower 67 by the belt 85. Drive. The drive shaft 82 is disposed below the control pump 24.

  Thus, in the drive transmission from the engine 6 to the blower 67, there is an advantage that a simple structure with a small number of parts can be realized and a compact design (small space design) can be achieved in terms of space.

  Further, the drive shaft 82 that drives the blower 67 is devised in terms of the positional relationship between the work output shaft 25 that is the upper shaft of the transmission and the drive pulley 86 (FIG. 19) of the blower 67 so that transmission is not hindered by the chemical tank 13. And provided below the bottom of the chemical tank 13.

  Thus, the drive of the blower 67 can be easily transmitted between the transmission and the blower 67 arranged at the rearmost part of the traveling vehicle body 1, although the large-capacity chemical tank 13 is placed.

  The pump on / off operation lever 17 for turning on and off the transmission of the drive pulley 86 (FIG. 19) provided on the transmission upper shaft (working output shaft) 25 is provided with a change shifter 27a (see FIG. 6) in the vicinity of the drive pulley 81. They are connected and arranged on the right side of the driver's seat 9 located above the control pump 24.

  As shown in the enlarged view in the frame A of FIG. 3, the boom lance (left boom operation lever 84L, right boom operation lever 84R), spray lever (left spray lever 87L, central spray lever 87C, right) The spray lever 87R) and the pressure adjusting device (pressure dial 91) are operated in a concentrated manner on the right side of the driver's seat, and can be prevented from being erroneously operated with the pump on / off operating lever 17 by being arranged on the right side in relation to this.

  In general, there is an inclined surface at the entrance to the paddy field from the farm road, and the chemical solution spraying vehicle usually enters the inclined surface while spraying the chemical solution to the paddy rice in the paddy field. When entering the paddy field, the vehicle advances while selecting a travel path that reduces the chance of stepping on rice with tires, operates the control pump drive switch 80 (FIG. 17), adjusts the distance between the crop and the spray nozzle 15a, and the spray lever 87. The operation load and the complicated operation overlap, and the operation load on the operator is large.

  When the chemical spraying vehicle enters the paddy field while traveling on the inclined surface, the traveling vehicle body 1 is tilted forward, so the chemical spraying nozzle 15a and the paddy rice may interfere with each other. Although the average appropriate distance between 15a and the crop is 30 cm, the chemical spray nozzle 15a and the paddy rice are too close to each other, and spray unevenness may occur.

  In order to solve this problem, the chemical spraying vehicle of this embodiment automatically detects the chemical spraying boom when the slope sensor 88 (FIG. 20) disposed at the bottom of the traveling vehicle body 1 detects a predetermined inclination of the traveling vehicle body 1. 15 (center boom 151 and side boom 152) is raised, and an automatic boom raising control mechanism A for controlling so that paddy rice and the chemical spray nozzle 15a do not interfere with each other is provided.

  Therefore, it is possible to reduce the operation load of the operator by automatically raising the boom 15 so that the chemical spray nozzle 15a does not interfere with the paddy rice during advance while the chemical spray vehicle is tilted forward. Moreover, since it can prevent that the crop and the chemical | medical solution spraying nozzle 15a are too close, spraying precision is stabilized.

  In addition, as a condition for starting the raising control of the entire boom 15 by the automatic boom raising control mechanism A, it is assumed that the inclination angle of the farm scene is not less than a predetermined angle and the drive switch 80 of the control pump 24 is turned on. By doing so, the control conditions were limited and the device was devised in terms of safety so that the chemical spraying boom 15 would not rise in a state unexpected by the operator.

  Further, the boom raising / lowering switch 89 (FIG. 17) is manually operated by an operator so that the automatic boom raising control is cleared. This is because the manual operation for raising the boom is given priority over the automatic boom raising control so that the operator can operate the boom 15 as desired.

  Further, in the chemical solution spreading work vehicle equipped with the flow rate sensor 114 (FIG. 21), the control device 100 may detect the flow rate of the chemical solution based on the detection value of the flow rate sensor 114 and start the boom raising control at the same time. good.

  With the above-described control configuration, boom raising control can be performed only for the control work, so that a safe work can be performed.

  Further, when the chemical boom 15 is raised to the set maximum elevation height, the crop and the chemical spray nozzle 15a are too far away from each other, so that they are easily affected by the wind, and the chemical spray pressure is insufficient, so that the chemical solution reaches the plant stock. There is a fault that does not reach. Further, since the chemical liquid particles drift and the operator is exposed to the agricultural chemical, it is necessary to stop the rise of the chemical boom 15 during the ascending process up to the maximum ascent height.

  Therefore, if the automatic boom raising control mechanism A on the approach path of the chemical solution spraying work vehicle to the paddy field is configured to automatically stop at a predetermined time after the boom 15 starts to rise, the boom 15 is prevented from being raised too much. be able to.

  FIG. 20 shows a side view when the chemical spraying work vehicle is on an inclined surface entering the paddy field. In combination with the control start condition of the boom automatic ascent control mechanism A, the pulse signal of the vehicle speed sensor 90 (FIG. 21) is shown. When there is no occurrence, that is, when the traveling is stopped, the boom 15 is not automatically raised even if the prevention pump 24 is on or the traveling vehicle body 1 is tilted forward.

  That is, the boom 15 is not automatically raised when the traveling vehicle body 1 is stopped on the inclined surface entering the paddy field.

  When the traveling vehicle body 1 is stopped at the inclined surface entering the paddy field, usually, the operator is examining the optimum route on the approach route from the traveling vehicle body 1 to the paddy field. If the boom 15 is raised when the vehicle body 1 is stopped, the rise timing is too early and the crop and the spray nozzle 15a are separated too much. Prohibit automatic ascent.

  In addition, when spraying a high concentration of agricultural chemicals as in China, it is necessary to have a structure in which the operator does not suck the chemical liquid particles discharged from the chemical liquid spray nozzle 15a so as not to cause health damage.

  Accordingly, a center boom 151 is disposed in front of the traveling vehicle body 1 having the clear water tank 92 and the chemical liquid tank 13 for storing the chemical liquid shown in FIG. 21, and an angle of 90 degrees with the chemical liquid spraying direction of the chemical liquid spray nozzle 15a on the front side. It is also possible to provide a chemical solution spraying vehicle including a mist ejection pipe 93 having a mist spray nozzle 94 that forms a mist curtain 94a by spraying water forward or backward.

  The mist curtain 94a can be formed simply by attaching a mist spraying pipe 93 having a mist spray nozzle 94 for the mist curtain 94a by attaching to a conventional chemical solution spraying vehicle used in the embodiment of the present invention. There is no possibility that the chemical sprayed by the curtain 94a flows to the operator side.

  FIG. 21 is a configuration diagram showing a medicine spraying piping system of the medicine spraying work vehicle of FIG. 1. This medicine spraying work vehicle is provided with a water supply cock 102 in a water supply path (hose) 101 from the chemical liquid tank 13, and the water supply A control pump 24 is provided at the outlet of the suction filter 104 provided in the water supply path (hose) 101 downstream from the cock 102. A water discharge hose 106 is connected to an outlet portion of the control pump 24, and a tip of the water discharge hose 106 is connected to an installation portion of the spray cock 109 via a chemical solution path 107. A safety valve 110, an air chamber 111, a flow rate control valve 113, and a flow rate sensor 114 are installed in this order from the upstream side between the water discharge hose 106 and the chemical solution path 107.

  Water is sprayed in the form of mist from the vicinity of the center boom 151 from the fresh water tank 92 via the mist ejection pipe 93. The spraying power is performed by an electric gear pump 112 provided in the mist ejection pipe 93. The same number of nozzles 94 for spraying mist-like water as the chemical spray nozzles 15a are provided at positions corresponding to the respective chemical spray nozzles 15a of the center boom 151 of the mist spray pipe 93 for spraying water in the mist form. The mist-like water is designed to form a mist curtain 94a as a whole. Moreover, since the mist-shaped water blowing direction forming the mist curtain 94a is at an angle of 90 degrees with the chemical spraying direction toward the crop of the chemical spray nozzle 15a, it is the front or rear direction of the traveling vehicle body and the horizontal direction. A water curtain is formed in the form of a mist, enabling the protection of the operator and the application of chemicals to the crop.

  Further, a spillage hose 115 is connected between the water discharge hose 106 of the pressure setting unit of the safety valve 110 and the chemical liquid tank 13. When the safety valve 110 is opened, excess chemical solution in the water discharge hose 106 can be returned to the chemical solution tank 13. Further, a stirring hose 116 branched from the water discharge hose 106 on the upstream side from the installed portion of the spillage hose 115 and connected to the chemical tank 13 is also provided. The opening degree of the flow control valve 113 is controlled by a flow control motor (not shown).

  The chemical solution in the chemical solution tank 13 is supplied to the center boom 151 and the side boom 152 via the spray cock 109. The supply amount of the chemical solution per unit area to each boom 151, 152 can be adjusted by the flow control valve 113.

  For example, a vehicle speed sensor 90 that measures the number of rotations of an axle with a vehicle speed pulse is provided, and a vehicle speed obtained from the vehicle speed sensor 90 is calculated by the controller 100 on the machine side and used for drug spray control (medicine spray control). Function).

  As described above, since the mist spray nozzle 94 for the mist curtain 94a is only newly attached by attaching to the chemical spraying work vehicle, the mounting work is facilitated, and no confusion with the original chemical spraying system or operation error occurs. There are benefits.

  An electric gear pump 112 can be used as a power source for forming the mist curtain 94a. In this case, there is an advantage that the system for forming the mist curtain 94a operates quietly without noise and does not deteriorate the operating environment of the operator.

  The on / off operation of the electric gear pump 112 provided in the mist jet pipe 93 for supplying water from the fresh water tank 92 to the mist spray nozzle 94 is controlled by the chemical controller for the chemical spraying work vehicle 100 serving as the base system. For example, a control configuration is adopted in which the control pump 100 is turned on and the control controller 100 detects the output of the vehicle speed sensor 90 and simultaneously the electric gear pump 112 is driven.

  In this way, since the operation of the mechanism for forming the mist curtain 94a is linked with the operation of the chemical solution spraying mechanism for controlling, it is possible to greatly reduce operator error without forgetting to form the mist curtain 94a. . The mist spray pipe 93 is provided with a mist spray cock 109, and the amount of water for forming the mist curtain 94a can be adjusted manually.

  When the chemical spraying vehicle stops running in the field for some reason, for example, the chemical amount check operation, the output from the vehicle speed sensor 90 is lost, so the electric gear pump 112 can be stopped at the same time, and the mist curtain 94a Are not formed at the same time.

  The fresh water tank 92 is desirably smaller in consideration of the front-rear balance of the traveling vehicle body 1. Therefore, unnecessary water mist curtain 94a can be eliminated and the water in the fresh water tank 92 can be extended.

  As shown in the side view of FIG. 22 (a) and the plan view of FIG. 22 (b), a mist jet having a water jet nozzle 94 so as to form a mist curtain 94a in front of the chemical spray nozzle 15a toward the front in the horizontal direction. A pipe 93 is provided, and both sides and the rear portion of the driver seat 9 are opened, and a chemical spraying work vehicle having a simple cabin 71 with a glass 71a attached to the front surface, and air curtains 121b are formed on both sides and the rear portion of the driver seat 9. As described above, when the air pipe 121 provided with a large number of air outlets 121a is connected to the blower pipe 68 of the blower 67, the operator can be protected from chemical exposure while maintaining light weight.

  As shown in FIG. 22, both sides and the rear part of the driver's seat 9 are opened, and a chemical solution spraying vehicle having a simple cabin 71 with a glass 71a attached to the front side is used in front of the traveling vehicle body 1 in the horizontal direction in addition to chemical solution spraying. By combining the configuration for forming the mist curtain 94a, the operator is not exposed to the chemical liquid.

  If the mist curtain 94a is formed instead of forming the air curtain 121b on both sides and the rear of the driver's seat of the control machine shown in FIG. 22, a good environment can be maintained especially during work in summer.

  The mist curtain 94a shown in FIGS. 21 and 22 is located in the vicinity of the center boom 151 disposed in front of the chemical solution spraying vehicle (control machine) shown in the side view of FIG. 23 (a) and the plan view of FIG. 23 (b). Thus, a mist spray nozzle 94 having a 90-degree jetting direction different from that of the chemical liquid is disposed only in the mist jet pipe 93 corresponding to the downward spraying chemical liquid spraying nozzle 15a provided on the center boom 151.

  By spraying high-pressure mist from the spray nozzle 94 dedicated to water, the chemical liquid particles that soar from below (drift) were blocked, and the scattering of the chemical liquid particles toward the operator was greatly reduced.

  This mist curtain system has the advantage that it is lighter and less expensive than the air curtain system.

  A mist ejection pipe 93 is provided in parallel with the center boom 151 having the chemical solution spray nozzle 15a, and nozzles 94 for spraying water particles (mist) are provided at substantially equal intervals on the mist ejection pipe 93 to form a mist curtain 94a. Then, when the intervals of the nozzles 94 for spraying water are not uniform, an extra gap is generated between the mist curtains 94a formed by the nozzles 94, and the chemical solution is scattered from the gap (space) to the sky. However, this embodiment does not have such a drawback.

  Further, since the nozzle 94 for mist (water) spraying is provided on the extension line in the traveling direction of the chemical spray nozzle 15a provided on the center boom 151, as shown in the side view of the front portion of the chemical spray vehicle in FIG. The spray chemical solution directly under the chemical solution spray nozzle 15a has the largest amount and may overlap the region where the mist curtain 94a is formed in a region that tends to scatter.

  In this case, the amount of the spray chemical solution directly under the chemical spray nozzle 15a is the largest and can be overlapped with the region where the mist curtain 94a is formed in the region where the spray solution tends to be scattered. Can be reduced.

  As shown in FIG. 23B, the width of the mist curtain 94a formed by the mist spray from the nozzle 94 for mist (water) spraying is such that the width of the traveling vehicle body 1 is overhang and formed. Therefore, the area where the mist curtain 94a is formed can be widened, and there is an effect of suppressing the entry of the chemical liquid particles into the driver seat 9 from the lateral direction.

  As shown in the partially enlarged view of the side view of the chemical solution spraying vehicle in FIG. 24, in the arrangement relationship between the chemical solution spray nozzle 15 and the mist spray nozzle 94 forming the mist curtain 94a, the spray port of the mist spray nozzle 94 is a chemical solution. You may arrange | position in the position higher than the spray outlet of the spray nozzle 15. FIG.

  In the case of this configuration, since there is no occurrence of a discontinuous portion in the mist curtain 94a, there is an effect that it is possible to prevent the medicinal liquid particles from slipping over. That is, when the spray chemical and the mist curtain 94a overlap each other, the curtain formation may be hindered and the effect may be reduced, but such a problem is solved.

  The mist spray nozzle 94 provided in the mist jet pipe 93 is arranged toward the rear of the traveling vehicle body 1 as shown in the side view in FIG. 25A and the plan view in FIG. A configuration in which the mist curtain 94a is formed on the rear side of the aircraft from 151 may be adopted.

  In normal control work, since the traveling vehicle body 1 passes through the chemical liquid region sprayed by the chemical spray nozzle 15a, chemical liquid particles are often retained and scattered behind the center boom 151, so that the chemical liquid scattering is greatly reduced. There is a merit that it is possible to provide safe work by suppressing the exposure of chemicals to the operator.

  In addition, the spraying from the nozzle 94 is mist, and in the control work under the hot weather in summer, the inside of the engine room becomes hot and may cause overheating, but the effect that also serves as a cooling effect in the engine room can be expected. .

  Further, the mist spray nozzles 94 provided with the mist ejection pipes 93 are arranged at regular intervals, so that the effect of suppressing the scattering of the chemical liquid particles is high, and a safe operation can be provided.

  Further, the nozzle 94 for mist spraying is provided on the extension line in the traveling direction of the chemical solution spray nozzle 15a provided on the center boom 151, so that the effect of suppressing scattering of the chemical solution particles is high, and a safe operation can be provided.

  Further, since the nozzle 94 is disposed so that the width of the mist curtain 94a formed by the mist spray from the nozzle 94 for mist spraying is overhanging the width of the traveling vehicle body 1, the area for forming the mist curtain 94a is defined. There is an effect of suppressing the invasion of the liquid chemical particles into the driver's seat 9 from the lateral direction.

  As shown in the partially enlarged view of the plan view of FIG. 26, the spraying direction of the water spraying nozzle 94 provided with the mist spraying pipe 93 for forming the mist curtain 94a by water spraying can be manually switched arbitrarily. The nozzle 94 can also be used.

  In this case, for example, when it is desired to form the mist curtain 94a in either the front direction or the rear direction of the center boom 151, the mist curtain 94a is formed in an arbitrary direction by rotating and switching the spray nozzle 94. be able to. Since the spraying environment conditions such as the wind direction change during the control work, adaptability can be enhanced by using the above configuration.

  Further, as shown in the partially enlarged view of the plan view of the chemical solution spraying vehicle in FIG. 27, spraying of only one specific nozzle 94 among the spray nozzles 94 for mist spraying provided in a plurality of mist spraying pipes 93. A structure in which the opening degree is fully opened, the spraying direction can be manually switched arbitrarily, the mist spraying direction of the other nozzles 94 is rotated 90 degrees, and these are closed to provide a cleaning function for the pesticide bottle 122 It can be.

  All of the undissolved pesticide in the pesticide bottle 122 can be put into the chemical tank 13, so that the waste of the pesticide can be eliminated, and the agrochemical bottle in the subsequent process can be washed, and maintenance before work can be performed efficiently. Moreover, this structure has the merit which can be utilized also for the hand-washing after mixing an agrochemical, and can provide a safe operation | work. Furthermore, since it is a pressure spray, there is an effect that the attached chemical solution can be easily removed.

  As shown in the partially enlarged view of the side view of the chemical solution spraying vehicle in FIG. 28, both the nozzles 15 and 94 are disposed in a state where the chemical solution spray nozzle 15 is disposed at a position lower than the mist spray nozzle 94 forming the mist curtain 94a. The boom 15 and the mist ejection pipe 93 for supplying the chemical solution and water to the boom raising / lowering link 75 can be integrally raised and lowered.

  The height of the crops to be sprayed with chemicals varies greatly depending on the type of crop, but with the above configuration, it is not affected by the height of the crops. Can provide a machine.

  As shown in the partially enlarged view of the side view of the chemical liquid spraying work vehicle in FIG. 29, the mist spray nozzle 94 can be inclined forward, and the mist curtain 94a can be inclined forward. In this case, since the scattering is suppressed by the mist curtain 94a before the chemical solution spreads, the scattering prevention effect is high.

  Further, the water spray nozzle 94 may have a rotating structure so that the mist curtain 94a can be formed at an arbitrary angle. In the case of treating the undissolved chemical solution in the pesticide bottle 122 (FIG. 27), there is a merit that it is easy to handle the spray of water in the forward inclination because the chemical solution in the pesticide bottle 122 does not spill, and the effect of expanding the use Is expensive.

  In the embodiment shown in the side view of FIG. 30 (a) and the plan view of FIG. 30 (b), the mist spray nozzle 94 provided with the mist ejection pipe 93 is arranged as a two-way nozzle toward the front and rear of the traveling vehicle body 1. These mist spray nozzles 94 may be provided at predetermined intervals so that the forward mist curtain 94a and the backward mist curtain 94a can be formed simultaneously.

  By forming the mist curtain 94a in a wide range in the front and rear rather than the conventional unidirectional mist curtain 94a formation, there is a great effect of substantially suppressing the scattering of the chemical liquid particles. In addition, since the operator's chemical exposure and splashing to the vicinity (adhesion to people and laundry, pesticide residue problems on adjacent crops) are reduced, mental stress in the control work is also reduced.

DESCRIPTION OF SYMBOLS 1 Traveling vehicle body 13 Chemical solution tank 15 Chemical solution spray boom 15a Chemical solution spray nozzle 24 Control pump 67 Blower device 68 Blower piping (blower duct)
68a Air outlet 69 Air 69a Air curtain 90 Vehicle speed sensor 92 Fresh water tank 93 Mist ejection pipe 94 Mist spray nozzle 94a Mist curtain

Claims (3)

A chemical solution tank (13) and a fresh water tank (92) are provided on the traveling vehicle body (1), and a chemical solution sent from the chemical solution tank (13) downwards to the front of the vehicle body is discharged from a plurality of chemical solution spray nozzles (15a). In the chemical spraying vehicle with the boom (15),
A plurality of mist spray nozzles (94) for connecting a mist jet pipe (93) to the fresh water tank (92) and blowing water substantially parallel to the ground from the front to the rear of the traveling vehicle body (1) or from the rear to the front. ) Is provided in a mist ejection pipe (93) disposed in front of the traveling vehicle body (1).   The chemical spray vehicle according to claim 1, wherein the spray port of the mist spray nozzle (94) is disposed at a position higher than the spray port of the chemical spray nozzle (15a).   When the control pump (24) for spraying the chemical liquid from the chemical liquid spray nozzle (15a) is turned on and the traveling of the traveling vehicle body (1) is detected by the vehicle speed sensor (90), the mist spray nozzle (94) 3. The chemical solution spraying work vehicle according to claim 1, wherein the clear water is sprayed in a mist state.

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