JP2001276691A - Prevention liquid spreading control device for boom sprayer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the increase in sprayed particle diameter by informing the lowering of the spray pressure of a boom sprayer. SOLUTION: In the boom sprayer having spray nozzle 2 for spraying a liquid forcibly fed by a liquid pump 1, the change in the flow rate or the pressure is displayed by the detection of the liquid flow rate and the liquid pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boom sprayer control apparatus for spraying a control liquid on a boom sprayer.

[0002]

2. Description of the Related Art When a chemical liquid is ejected from a spray nozzle of a boom sprayer, when a predetermined liquid pressure is reached, a part of the liquid is reduced by a liquid pump to a liquid tank, and the amount of the liquid to the spray nozzle or the liquid pressure is reduced. Is controlled to be constant.

[0003]

When the spray nozzle wears out due to the spraying of the chemical solution, even if the spraying amount is adjusted, the atomized droplets of the sprayed drug become large, the adhesion to the crop is reduced, and the medicinal effect is reduced. Sometimes it goes down. In particular, it is remarkable when a small amount is sprayed or when the vehicle speed is interlocked with a low speed. The present invention solves such a defect.

[0004]

According to a first aspect of the present invention, there is provided a boom sprayer having a spray nozzle for spraying a liquid pumped by a liquid pump, the flow rate of the liquid being changed by detecting the liquid flow rate and the liquid pressure. , Or a change in pressure is displayed.

According to a second aspect of the present invention, when the spray flow rate or spray pressure of the control liquid from the spray nozzle 2 is equal to or less than a predetermined value, the liquid is driven by driving the auxiliary pump 3 to reduce the spray flow rate or spray pressure. It is characterized by being kept constant.

[0006]

According to the first aspect of the present invention, when the flow rate at the predetermined pressure or the change in the pressure at the predetermined flow rate greatly changes, these changes are displayed, so that the spray state can be known. It is possible to confirm whether or not the particle size of the spray is large.

According to the second aspect of the present invention, during the spraying operation, when the spraying flow rate or spraying pressure of the control liquid from the spray nozzle 2 falls below a predetermined value, the spraying nozzle 2 receives the liquid sent by the drive of the auxiliary pump 3. Since the spraying flow rate or spraying pressure at is maintained constant, the spray particle size can be kept constant and dripping can be prevented.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be implemented as a boom sprayer which carries out a spraying operation while traveling on a field by mounting a spraying boom on a vehicle body for riding. The invention according to claim 1 is a boom sprayer having a spray nozzle for spraying a liquid pumped by a liquid pump,
Controlling liquid spray control device that displays flow rate change or pressure change by detecting liquid flow rate and liquid pressure, and knows chemical liquid flow rate and pressure change at spray nozzle during work. Thus, it is easy to determine and confirm whether or not the spray particle size is large.

According to a second aspect of the present invention, when the spraying flow rate or spraying pressure of the control liquid from the spray nozzle is equal to or lower than a predetermined value, the auxiliary pump is driven to feed the spraying liquid to keep the spraying flow rate or spraying pressure constant. This is characterized in that the spray flow rate or the spray pressure at the spray nozzle is kept constant by the liquid supply from the auxiliary pump, and the spray particle size is kept constant.

[0010] Here, the boom sprayer sets characteristics such as a spraying liquid pressure and a spraying liquid flow rate to predetermined values in advance according to a spraying width, a crop to be sprayed, and the like. Spray work is performed while maintaining and controlling the spray flow rate and pressure. At this time, if the spraying flow rate or the pressure deviates greatly from these characteristic values, a warning is given by a display device or a buzzer.

Further, the auxiliary pump is independent of the liquid pump, and the liquid sent by the auxiliary pump may be the liquid in the same liquid tank sent by the liquid pump. May use liquid from a separate auxiliary liquid tank. Further, mere water may be used instead of the chemical liquid as the liquid of the auxiliary liquid tank.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment will be described with reference to FIGS. The boom sprayer mounted on the tractor vehicle body 4 in the riding traveling mode is mounted to be able to move up and down by a lift link 5 on the front side of the vehicle body 4, and is moved up and down by expansion and contraction of a lift cylinder 6. The vehicle body 4 has front wheels 9 steered by a steering wheel 8 in front of a driver's seat 7 and rear wheels 10, and can be driven and driven by an engine E mounted below the hood 11. A liquid tank 12 that surrounds the driver's seat 7 is mounted at the rear of the vehicle body 4, and the liquid pump 1 is mounted at the rear of the liquid tank 12, and is linked with the PTO shaft on the vehicle body 4 side.

A spraying boom 13 having a spray nozzle 2 mounted on the front side of the vehicle body 4 is attached to a lift frame 14 at the front end of the lift link 5 which is lifted and lowered in a horizontal horizontal position. The spraying boom 13 is made of a pipe material, and the spray nozzles 2 are arranged at predetermined intervals. Also,
The scatter boom 13 includes a centric boom disposed in front of the lift frame 14 and side boom portions on both the left and right sides. it can. Reference numeral 15 denotes a suction port of the liquid tank 12, and a pump circuit 16 and a hydraulic circuit 17 formed of a hose are connected across the spraying boom 13.
Reference numeral 18 denotes a pressure tank, and 19 denotes a flow control valve. The flow control valve 19 is adjusted by a flow control actuator 33 that is electromagnetically output from the controller 29.

At the base of the spraying boom 13, there are provided a flow sensor 20 for detecting the flow rate of the drug solution and a pressure sensor 21 for detecting the pressure of the fluid. A control panel 23 is provided on a steering post 22 on which the steering handle 8 is disposed. The control panel 23 has a display 24, a spray amount setting switch 25 for setting a spray amount, a display changeover switch 26, and a spray boom 13 A spray width setting switch 27 for setting the spray width according to, a control switch 28 and the like are provided.

A controller 29 is provided below the control panel 23 to control the sensors 20 and 2.
1, the switches 25 to 27, the display 24, and the like are connected to the input unit or the output unit. Further, a vehicle speed sensor 30 for detecting a vehicle speed from the transmission rotation to the rear wheel 10 is provided at an input portion of the controller 29, and a pressure control actuator 31 for adjusting a fluid pressure of the spraying boom 13 is provided at an output portion. Is provided. As the pressure control actuator 31, for example, a drainage circuit 32 is provided with a pressure control valve for adjusting the pressure by releasing the overpressure from the pressure tank 18, and the pressure can be adjusted by the electromagnetic output from the controller 29.

By setting the flow rate by the spray flow rate setting switch 25 and setting the spray width by the spray width setting switch 27, a control line graph of flow rate and pressure as shown in FIG. 6 is selected or formed. For example, A
The line indicates that the spray amount is 100 l (per are)
The line B indicates a case where the spray width is set to 10 m, and the line B indicates a case where the spray width is set to 10 m with a small amount of 25 l. The C line has a spraying amount of 100 l and a spraying width of 8 m.
Line D is a case where the spraying amount is 25 l and the spraying width is 8 m.

As described above, when the spray flow rate and the spray width by the spray boom 13 are determined by the setting operation of the spray amount setting switch 25 and the spray width setting switch 27, the control lines A to D by the controller 29 are determined. For this reason, the spraying action from the spray nozzle 2 is performed by driving the liquid pump 1. At this time, the spraying amount is controlled and maintained so as to be the amount set by the setting switch 25 by the detection by the flow rate sensor 20. With pressure sensor 2
By the detection by 1, the spraying pressure corresponding to the control lines A to D corresponding to the flow rate and the spraying width is controlled and maintained. At this time, the flow control is performed by the flow control valve 19 which is the flow control actuator 33, and the pressure control is performed by the pressure control valve 32 which is the pressure control actuator 31.

The liquid pressure detected by the pressure sensor 21 is displayed on a display 24. Moreover, when the displayed fluid pressure drops significantly from the pressure range along the control lines A to D, it is displayed that the detected pressure is abnormal, and the alarm is notified.
At this time, the driver issues such a display or warning
The correction is performed so that appropriate control is performed.

Although the pressure control in the spraying boom 13 is performed based on the spraying flow rate, the flow rate control may be similarly performed based on the spraying pressure. Differences from the above example will be described mainly on the second embodiment with reference to FIG. An auxiliary circuit 34 for supplying the liquid supplied from the auxiliary pump 3 to the hydraulic circuit 17 of the spraying boom 13 is connected via a check valve 35, and the pressure sensor 21 in the hydraulic circuit 17 is set to a certain value or less. By driving the motor 37 with the output from the controller 36 to drive the auxiliary pump 3, the pressure is increased by sending liquid from the hydraulic circuit 17 to the spraying boom 13. Maintain a constant hydraulic pressure. The liquid supplied to the spraying boom 13 by the auxiliary pump 3 uses water stored in an auxiliary liquid tank 38 independent of the liquid tank 12 for storing the medicine by the liquid pump 1. In this case, the liquid in the liquid tank 12 may be sucked by the auxiliary pump 3 and supplied.

When the pressure sensor 21 of the hydraulic circuit 17 detects a hydraulic pressure below a certain level, the auxiliary pump 3 is driven and the water in the auxiliary liquid tank 38 is supplied to the hydraulic circuit 17. , The hydraulic pressure at the spraying boom 13 is increased. And a pressure sensor 2 that rises to a constant pressure
1 and the output of the controller 36, the driving of the auxiliary liquid pump 3 is stopped. For this reason, dripping from the spray nozzle 2 can be prevented.

The third embodiment will be described mainly with reference to FIGS. A carrier frame 40 having a rear end formed in a loop shape is connected to the rear of a rear axle housing 39 on which the rear wheel 10 of the vehicle body 4 is mounted, and a carrier base 41 is provided on an upper side. The carrier frame 40 is connected to the upper portion of the rear end of the main frame 42 of the vehicle body 4 by a reinforcing frame 43 that is vertically inclined. The liquid pump 1 and the like can be mounted on the carrier frame 40, but an operator can ride on the carrier frame 40 and perform operations such as supplying medicine to the liquid tank 12.

When the front portion of the vehicle body 4 rises from the ground contact surface and is inclined rearward and downward, the carrier frame 40 contacts the rear end portion of the carrier frame 40 to prevent the vehicle body 4 from falling backward. 44 is a carrier step.

[Brief description of the drawings]

FIG. 1 is a spray circuit diagram of a boom sprayer showing a first embodiment of the present invention.

FIG. 2 is a plan view when mounted on a tractor.

FIG. 3 is a side view thereof.

FIG. 4 is a block diagram of a controller.

FIG. 5 is a plan view of a display unit.

FIG. 6 is a control graph thereof.

FIG. 7 is a scatter circuit diagram showing a second embodiment.

FIG. 8 is a side view of a vehicle body showing a third embodiment.

FIG. 9 is a plan view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid pump 2 Spray nozzle 3 Auxiliary pump 24 Display

Continued on the front page F-term (reference) 2B121 CB03 CB33 CB42 FA04 FA11 FA14 4D074 AA05 BB06 CC04 CC34 CC51 CC57 CC60

Claims (2)

[Claims] In a boom sprayer having a spray nozzle for spraying a liquid pumped by a liquid pump, a change in flow rate or a change in pressure is displayed by detecting a liquid flow rate and a liquid pressure. Liquid spray control device. 2. When the spray flow rate or spray pressure of the control liquid from the spray nozzle 2 is equal to or lower than a predetermined value, a liquid is sent by driving the auxiliary pump 3 to maintain the spray flow rate or spray pressure constant. The control device for spraying a control liquid on a boom sprayer according to claim 1.