JP2002018334A - Device for controlling spray quantity in liquid chemical spray vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease a power loss in the control of the spray quantity of a liquid chemical in a liquid chemical spray vehicle. SOLUTION: The self-traveling liquid chemical spray car for sending the liquid chemical discharged from a pump 23 to a pest control spray device 5 and spraying the chemical is provided with a revolution number control means for controlling the revolution of the pump 23, a pressure sensor 33 for detecting the pressure of a high pressure passage 25 for sending the liquid chemical discharged from the pump 23 to the pest control spray device 5, a car speed sensor 17 for detecting the car speed of the traveling farm machine and a spray quantity uniformalization control means for uniformalizing the spray quantity of the liquid chemical sprayed from the pest control spray device 5 per unit surface area by detecting the car speed by the car speed sensor 17 and the pressure by the pressure sensor 33 and controlling the number of revolution of the pump 23 based on the detected car speed. The quantity of the liquid chemical nearly equal to the spray quantity of the pest control spray device 5 is discharged from the pump 23 by controlling the number of revolution of the pump 23 correspondingly to the high or low car speed to reduce the quantity of the liquid chemical returned to a liquid chemical tank 24 and to decrease the power loss and then, the durability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a spray amount adjusting device for a chemical sprayer.

[0002]

2. Description of the Related Art For example, Japanese Patent Publication No. 6-2248 discloses a medicine spraying apparatus controlled by a microcomputer of a self-propelled medicine spraying car. This technology controls the pressure of a high-pressure passage through which a chemical solution is fed in relation to the vehicle speed while driving the pump 23 at a constant rotation speed and maintaining a constant amount of the chemical solution, so that a constant amount per unit area is obtained. It sprays the chemical solution.

[0003]

In the prior art,
The pump is rotated at a predetermined number of revolutions to maintain a constant amount of the chemical solution discharged from the pump, and while the chemical solution is being sent from the pump at a constant rate, the control valve on the high-pressure path is adjusted to adjust the spray amount of the chemical solution. Therefore, when the vehicle speed is low, the excess chemical liquid that is not sprayed is discharged from the pump, and a large amount of the excess chemical liquid is returned to the tank, thereby causing a problem that drive loss and durability of the apparatus are poor.

Accordingly, the present invention is to solve such a problem.

[0005]

According to the first aspect of the present invention, the pump 23 of the mobile agricultural machine is connected to the engine 6 or the pump motor 3.
5 is a self-propelled chemical spraying vehicle that drives and sprays the chemical discharged from the pump 23 to the control spraying device 5,
A pressure sensor 33 for detecting the pressure of the high pressure passage 25 that is provided with discharge amount adjusting means for adjusting the discharge amount of the pump 23 and sends the chemical discharged from the pump 23 to the control spray device 5
And a vehicle speed sensor 17 for detecting the vehicle speed of the mobile agricultural machine, and controlling the discharge amount of the pump 23 based on the detected vehicle speed detected by the vehicle speed sensor 17 to spray the chemical solution per unit area sprayed from the control spray device 5. The apparatus is characterized in that a spray amount stabilization adjusting means for adjusting the spray amount is provided.

[0006]

According to the first aspect of the present invention, during the control operation, the vehicle speed is detected by the vehicle speed sensor 17 and the pressure of the high pressure passage 25 to which the chemical solution is pumped from the pump 23 is detected by the pressure sensor 33.
, And sends the detected data to the control unit 34 having a built-in microcomputer to perform arithmetic processing. The pump 23 is connected with the speed of the vehicle 23 so that the amount of the chemical sprayed per unit area on which the mobile agricultural machine runs is constant. Adjust the number of revolutions to high or low.

According to the present invention, the number of rotations of the pump 23 is adjusted to be high or low in relation to the level of the vehicle speed.
The chemical liquid close to the spray amount is discharged from the pump 23, the chemical liquid returning to the chemical liquid tank 24 is reduced, the horsepower loss is reduced, and the durability of the apparatus can be improved.

[0008]

Embodiments of the present invention will be described below. The body 2 of the passenger management machine 1 has the same diameter
Rear wheels 3 and 4 are provided, and a control spray device 5 is attached to the front of the body 2. An engine 6 is mounted above the left and right front wheels 3, 3, and the engine 6 is covered with a hood 7. A seat 8 is provided above the left and right rear wheels 4, 4, and a handle 9 is disposed in front of the seat 8. Handle 9 at the rear of the bonnet 7
An instrument panel 10 is provided below. Handle 9
Is steered left and right, the left and right front and rear wheels 3 and 4 are steered simultaneously. A chemical solution tank 11 is detachably mounted around the seat 8 above the body 2.

An engine 6 is mounted on the front of the body 2 and is shown in FIG.
As shown in FIG. 2, the traveling transmission belt 14 and the traveling second pulley 1
5. Power is transmitted to the front wheels 3 and the rear wheels 4 via the traveling transmission shaft 16, and the vehicle speed is detected by detecting the rotation speed of the traveling transmission shaft 16 by the vehicle speed sensor 17.

Power is transmitted from a work pulley 18 attached to an output shaft force 12 of the engine 6 to a continuously variable speed pulley 20 via a work transmission belt 19, and the continuously variable speed pulley 20 is pulled by a bell control motor 21. The speed is adjusted by adjusting the diameter of the clutch.
Power is transmitted to the pump 23 for the chemical via the second pump 2.

When the pump 23 is driven, the water supply passage 23a
, A chemical solution in a chemical solution tank 24 is supplied to a pump 23, and is pumped from the pump 23 to a high-pressure passage 25. Further, a water diversion unit 26, boom opening / closing cocks 27, 27,.
Central boom 29 and left / right boom 3 via 8, 28, ...
0, 30 and sprays the chemical from the spray nozzles 31, 31,..., And the excess chemical is returned to the chemical tank 24 from the spill port via the spillway 32.

During the control operation, the vehicle speed is detected by the vehicle speed sensor 17, the pressure in the high-pressure path 25 is detected by the pressure sensor 33, and the detected data is sent to the control unit 34 in the microcomputer for arithmetic processing. The bell control motor 21 is adjusted and driven so that the amount of chemical solution sprayed per unit area on which the vehicle 1 travels is constant, the number of revolutions of the continuously variable pulley 20 is controlled, and the number of revolutions of the pump 23 is related to the level of the vehicle speed. To adjust the height. This control may be applied to a powder chemical or fertilizer spraying device.

In a conventional medicine spraying apparatus controlled by a microcomputer of a self-propelled medicine spraying car, as disclosed in Japanese Patent Publication No. Hei 6-2248, for example, the pump 23 is driven at a constant rotation speed while the pump 23 is driven at a constant speed. It controls the pressure of the high-pressure passage to spray a certain amount of the chemical per unit area.

In this prior art, the discharge rate of the chemical liquid is kept constant while the rotation speed of the pump is kept constant, and the discharge pressure of the chemical liquid in the high-pressure path is adjusted to adjust the spray amount. Therefore, when the vehicle speed is slow, a large amount of extra chemical is discharged,
A large amount of excess chemical liquid is returned to the tank, causing problems such as drive loss and reduced durability of the apparatus.

However, in this embodiment, the speed of the pump 23 is adjusted to a high or low level by the continuously variable pulley 20 in relation to the level of the vehicle speed. By being discharged, the amount of the chemical liquid returning to the chemical liquid tank 24 can be reduced, the horsepower loss can be reduced, and the durability of the apparatus can be improved.

Instead of the above-mentioned embodiment, for example, a pump motor (not shown) with an inverter
3, the vehicle speed is detected by the vehicle speed sensor 17, the pressure of the high-pressure path 25 is detected by the pressure sensor 33, and the detected data is sent to the control unit 34 in the microcomputer for arithmetic processing. The number of rotations of a pump motor (not shown) may be controlled so that the amount of the chemical solution sprayed per unit area where the vehicle travels is constant, and the pump 23 may be adjusted to a higher or lower level in relation to the vehicle speed.

With such a configuration, the control unit 34 controls the pump motor (not shown) to adjust the rotation speed of the pump 23, so that transmission from the PTO shaft to the pump 23 becomes unnecessary, and the vehicle speed is reduced. Since the rotation speed of the pump 23 is adjusted to a high or low level by a pump motor (not shown) in relation to the height, a chemical solution close to the spray amount of the control spray device 5 is discharged from the pump 23, and the chemical solution returning to the chemical solution tank 24 is removed. It is possible to reduce the power loss and improve the durability of the apparatus.

In the spray control of the chemical liquid, the chemical liquid is discharged at a constant pressure in a state where the spraying of the control spraying device 5 is stopped or in a state where the riding management machine 1 stops running and the spraying of the control spraying device 5 is stopped. It may be controlled to drive the pump 23 to perform the operation. In this way, the high-pressure water at the time of the spraying stoppage is returned to the chemical solution tank 24 to stir the chemical solution in the tank, and the non-spraying state is eliminated when the ride management machine 1 is switched from stop to running, so that the chemical solution can be smoothly supplied. Spraying can be started.

Next, the embodiment shown in FIG. 3 will be described. As in the previous embodiment, the pump 23 for chemicals is driven by the work pulley 18, the work transmission belt 19, and the continuously variable pulley 20 attached to the output shaft force 12 of the engine 6, or the pump 23 is driven by the pump motor 35. The pump 23 is supplied with water from the chemical liquid tank 24 via the water supply path 23a, and the chemical liquid is discharged from the pump 23 to the high-pressure path 25. The central fitting hose 37 and the left and right spray hoses 38, 38 are provided by the branch fitting 36. Branch into the central boom 2
9 and the left and right booms 30, 30, and a chemical solution is sprayed from the boom 30, and a stirring hose 39 is branched from a branch fitting 36, and an end portion of the stirring hose 39 is connected to the chemical solution tank 24.

The central spray hose 37 and the left and right spray hoses 38, 38 are provided with switching cocks 40, 40,... So that the spill water is branched into the spill hoses 41, 41,. Are joined to the water collecting fitting 43, the starting end of the spillway 32 is connected to the water collecting fitting 43, and the terminal end of the spillway 32 is connected to the pump 23 in the water supply passage 23a. Is also connected to a portion near the chemical liquid tank 24. Then, a flow rate sensor 42 is provided at the start end of the water supply passage 23a, a pressure sensor 33 is provided in the branch fitting 36, a pressure adjusting motor 44 is provided in the water collecting fitting 43, and the vehicle speed sensor 17 is omitted from the drawing as in the previous embodiment. Is provided.

In this embodiment, as in the previous embodiment, a control is performed to spray a fixed amount of the chemical solution per unit area. At this time, the center spray hose 37 and the left and right spray hoses 38, 38 are controlled. Since the spill water from the feed water 38 flows back to the pump 23 side from the flow sensor 42 in the water supply passage 23a via the spill passage 32, the detection value of the flow sensor 42 becomes the total spray amount as it is, and this flow sensor 42 Is the water supply channel 23a
Since low-pressure flowing water is detected, the cost can be reduced.

Further, the flow to the spillway 32 is closed by the switching cocks 40, 40,... So that the spilled water discharged from the pump 23 after the spraying is returned to the drug solution tank 24 via the stirring hose 39. If so, measure the total amount of application as follows. That is, the total spray amount (x + y + z) = a
Calculate as -c. It should be noted that y is the spray amount of the central boom 29, x and z are the spray amounts of the left and right booms 30, 30, a is the measured value of the flow sensor 42, c is the measured value of the pressure sensor 33, the coefficient of the stirring hose 39 and It is a numerical value calculated by a predetermined formula using a loss coefficient. Thus, the flow sensor 4
Since it is calculated from the measured value of 2 and the numerical value of the stirring hose 39, the error can be reduced.

Next, the embodiment shown in FIG. 4 will be described. This embodiment relates to an operation device of a control device of the control spray device 5. The operation panel 45 of the control unit 34 includes:
The display unit 46 is provided, and when the display changeover switch 47 is turned on, the engine speed, the vehicle speed, the amount of chemical solution sprayed per unit area, and the total amount of spraying are sequentially switched and displayed. By operating the setting switch 48, the amount of application per unit area can be set, and the setting contents are displayed on the display unit 46. Further, a decrease switch 49 and an increase switch 50 are provided so that the set amount can be increased or decreased.

In accordance with the contents set by the setting switch 48, the spray amount of the control spraying apparatus 5 is controlled so that the set amount of the chemical solution is sprayed per unit area. When the decrease switch 49 or the increase switch 50 is turned on, the set amount per unit area is decreased or increased by a predetermined amount, and the set amount is changed.
Then, the set amount that has been increased or decreased becomes a new set amount. Further, for example, when the decrease switch 49 and the increase switch 50 are simultaneously turned on, the set value is changed to the set amount before the increase / decrease adjustment.

With this configuration, even if the weight reduction switch 49 or the increase switch 50 is erroneously pressed, the previous setting state can be restored by pressing the reduction switch 49 and the increase switch 50 simultaneously. Operation can be facilitated. Next, an adjusting spring of the adjusting valve 52 provided on the branch fitting 36 will be described with reference to FIG.

A high-pressure passage 25 communicating with the pump 23 and a spillway 32 communicating with the chemical solution tank 24 are connected to the branch fitting 36, respectively. A ball-shaped adjustment valve 52 for flowing a chemical solution only from the high pressure 251 to the spillway 32 side is provided.

The control valve 52 is provided with a long coil-shaped first spring 53 having a small diameter so as to constantly press the valve, and a large coil-shaped short second spring 54 with a large diameter. One end of the first spring 53 and one end of the second spring 54 are fixed to the seat plate 56 adjusted by the adjusting screw 55, and the forward and backward rotation of the valve adjusting motor 57 adjusts the seat plate 56 to advance and retreat. Adjustable configuration.

With the above configuration, when spraying a small amount, the pressure can be adjusted with only the first spring 53 having a low spring constant, and the pressure can be adjusted with high accuracy. In the case of spraying, when the adjustment valve 52 is pressed by the first spring 53 and the second spring 54 by moving and adjusting the seat plate 56 to the protruding side, the second spring 54 having a high spring constant is also entangled, The pressure can be quickly adjusted with a small stroke.

[Brief description of the drawings]

FIG. 1 is an overall side view of a passenger management machine.

FIG. 2 is a block diagram of a main part.

FIG. 3 is a block diagram of a main part.

FIG. 4 is a front view of a main part.

FIG. 5 is a plan view and a side view of a main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Riding machine 2 ... Body 3 ... Front wheel 4 ... Rear wheel 5 ... Control spraying device 6 ... Engine 7 ... Bonnet 8 ... Seat 9 ... Handle 10 ... Instrument panel 11 ... Chemical liquid tank 12 ... Output shaft 13 ... Traveling pulley 14 ... Traveling transmission belt 15 ... Traveling second pulley 16 ... Traveling transmission shaft 17 ... Vehicle speed sensor 18 ... Working pulley 19 ... Working transmission belt 20 ... Continuously variable speed pulley 21 ... Belcon control motor 22 ... Electromagnetic clutch 23 ... Pump 23a ... Water supply path 24 ... Chemical liquid tank 25 ... High pressure path 26 ... Diversion unit 27 ... Boom opening / closing cock 28 ... High pressure branch path 29 ... Center boom 30 ... Left / right boom 31 ... Spray nozzle 32 ... Spillway 33 ... Pressure sensor 34 ... Control unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2B121 CB03 CB24 CB25 CB33 CB53 FA04 FA11 FA14 4D074 AA05 BB06 CC04 CC34 CC39 CC57 4F035 AA02 BA22 BB35 BC06

Claims (1)

[Claims] 1. A self-propelled chemical sprayer which drives a pump 23 of a mobile agricultural machine by an engine 6 or a pump motor 35 to send and spray a chemical discharged from the pump 23 to a control spraying apparatus 5. And a pressure sensor 33 for detecting a pressure of a high pressure passage 25 for sending a chemical solution discharged from the pump 23 to the control spray device 5, and a vehicle speed for detecting a vehicle speed of the mobile agricultural machine. A sensor 17 is provided to control the discharge amount of the pump 23 based on the detected vehicle speed detected by the vehicle speed sensor 17 and to constantly adjust the spray amount of the chemical per unit area sprayed from the control spray device 5. A spray amount adjusting device for a chemical sprayer, comprising an adjusting means.