JPH022726Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a liquid spraying device for a liquid spraying vehicle.

(Prior Art) Conventionally, Japanese Patent Laid-Open No. 104423/1984 has been known as a spraying vehicle for spraying water, anti-freezing chemicals, etc. onto roads.

(Problem to be solved by the invention) By the way, conventional spray vehicles drive the spray pump by an independent drive means such as an independent engine, but it is difficult to drive the spray pump by the driving engine of the vehicle. Although it is relatively easy to control the amount of spray, a portion of the space above the vehicle chassis must be used as installation space for the independent engine and its fuel tank, so depending on the installation space and weight of the liquid tank. It had a fatal drawback as a liquid spray vehicle: the absolute volume decreased.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a liquid spraying vehicle that can control the spraying amount to be constant per unit area without reducing the liquid tank volume.

(Means for Solving the Problems) The liquid dispersion device for a liquid transport vehicle of the present invention includes a hydraulic drive means consisting of a variable displacement hydraulic pump and a hydraulic motor driven from a traveling engine via a power extraction device, and a hydraulic drive means for a hydraulic motor. a liquid spray pump linked to a motor; a flow rate control means linked to the hydraulic drive means to control the discharge amount of the variable displacement hydraulic pump; A liquid sprinkler that uses a detection device to detect and an output signal from the detection device to operate a flow rate control means to synchronize the rotation speed of a hydraulic motor or a liquid sprinkler pump with the traveling speed to keep the amount of liquid sprinkled per unit area constant. The present invention is characterized by comprising a control means.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, 1 is a liquid spraying vehicle that sprays water, antifreeze chemicals, etc. on roads, and a liquid tank 5 is mounted on the chassis 2 behind the driver's cab 3.
is listed. In front of the chassis 2 is a power take-off device (flywheel PTO) from the traveling engine 35.
A hydraulic drive means 6 connected via a hydraulic drive means 4 and a liquid spray pump 7 linked to the hydraulic drive means 6 are provided.

In addition, the main passage 10 of the liquid distribution piping system is connected to the liquid tank 5.
The three-way valve 11 and the liquid spray pump 7 are connected in this order from the front lower part of the 3-way valve 11 to branch into the right liquid spray path 12a and the left liquid spray path 12b.
5a, 15b and rear nozzles 16a, 16b are connected. The main passage 10 includes an in-tank stirring pipe 19, left and right discharge passages 21a and 21b having two-way valves 20a and 20b, and a water cannon connection passage 22.
is branched off, and the stirring pipe 19 is introduced into the tank 5.

Therefore, by driving the liquid spray pump 7, the tank 5
The liquid inside flows through the front, rear, left and right nozzles 15a, 15b, 1
Dispersed from 6a and 16b.

The hydraulic drive means 6 mainly includes a variable displacement hydraulic pump P and a constant discharge hydraulic motor M,
A servo cylinder 61 is installed on the swash plate 60 of the hydraulic pump P.
The servo cylinder 61 is connected to a discharge amount control valve 62.

Note that 62 is a charge pump.

Further, a flow rate control means 28 and a liquid spray control means 29 are linked to the hydraulic drive means 6, and the flow rate control means 28 is connected to a stepping motor 65 and an operating lever 67 connected to a control handle 64 of a discharge amount control valve 62. It controls the tilting angle of the swash plate of the hydraulic pump P, that is, the discharge amount per revolution. The liquid spray control means 29 operates the flow rate control means 28 so as to keep the amount of liquid sprinkled per unit area constant, and includes a tachometer generator 31, a microcomputer 32, and a pulse motor drive circuit 3.
3 are connected in this order, while the transmission 36 of the travel engine 35 and the tacho-generator 37 are connected in this order. Each tachometer generator 31,
37 is a detection device that detects the rotation speed and running speed (rotation speed of the drive shaft 9) of the hydraulic motor M (or liquid spray pump 7; the same applies hereinafter), and the microcomputer 32 detects the rotation speed and running speed of the hydraulic motor M. This output signal operates the pulse motor 65 to operate the flow rate control means 28 so as to synchronize the rotational speed of the hydraulic motor M with the travel speed.

Furthermore, the flow rate control means 28 and the liquid level detection circuit 44 of the liquid tank 5 are connected to an abnormality alarm display means 45 through the microcomputer 32, and the abnormality alarm display means 45 detects that the rotation speed of the hydraulic motor M is higher than the setting, the engine 6 and the drive This indicates an imbalance with the rotational speed of the shaft 9 and an insufficient amount of liquid in the liquid tank 5, respectively.

The liquid level detection circuit 44 is connected to a level switch 50 in the tank 5, which detects the liquid level at an appropriate number of positions including the alarm position.

Next, liquid spraying control will be explained. First of all,
With the power extraction device 4 in contact, the hydraulic drive means 6 is driven to rotate the liquid spray pump 7, while the vehicle is driven to spread the liquid. In this state, each tachometer generator 31, 37 detects the rotational speed and traveling speed of the hydraulic motor M of the hydraulic drive means 6, that is, the rotational speed of the drive shaft 9, and the microcomputer 32 compares and calculates the two rotational speeds.

Subsequently, the output signal of the microcomputer 32 is input to the pulse motor 65 via the drive circuit 33, and the discharge amount control valve 62 is actuated by driving the pulse motor 65, and the discharge amount of the hydraulic pump P is controlled to increase the hydraulic pressure. The rotation speed of the motor M is synchronized with the traveling speed, the rotation of the liquid spray pump 7 changes according to the traveling speed, and the amount of liquid sprinkled per unit area is always constant.
That is, in the case of high-speed running, each nozzle 15a, 15
The amount of liquid released from b or 16a, 16b is large,
This decreases when driving at low speeds.

Therefore, since various abnormalities can be quickly recognized, appropriate measures can be taken quickly, and liquid dispersion work can be performed safely and reliably.

In addition, the rotation speed detection device is the tachometer generator 3.
It is not limited to 1,37.

Furthermore, the detection of the traveling speed is not limited to the number of revolutions of the drive shaft 9, and the number of revolutions detecting section is, of course, not limited to the transmission 36 as in the embodiment.

(Effects of the invention) As described above, according to the invention, a sufficient tank capacity can be secured by using the traveling engine as a drive source without installing a separate drive source, and a liquid spray pump and a flow rate control means are used as hydraulic drive means. A liquid spray control means is provided which operates the flow rate control means so as to synchronize the rotational speed of the hydraulic drive means with the running speed of the vehicle, and the amount of liquid sprayed per unit area is kept constant. Even if the running speed changes, the liquid can be spread evenly, so the amount of spraying can be automatically increased or decreased according to the running speed without requiring advanced operating techniques, making the spraying work easier. This can be done quickly and efficiently, and at the same time, the liquid can be sprayed efficiently.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a side view of a liquid dispersing vehicle, FIG. 2 is a piping system diagram of the liquid dispersing vehicle, and FIG. 3 is a schematic configuration diagram of a liquid dispersing device. Figure 4 is a schematic explanatory diagram of the hydraulic drive means;
FIG. 5 is a block diagram of the liquid dispersion control means. 1...Liquid spray vehicle, 4...Power extraction device, 5...
...Liquid tank, 6...Hydraulic drive means, 7...Sprinkle pump, 9...Drive shaft, 28...Flow rate control means, 29...Sprinkle control means, 31, 37...
...Tachogenerator (detection device).

Claims (1)

[Scope of utility model registration request] A hydraulic drive means consisting of a variable displacement hydraulic pump and a hydraulic motor driven by a traveling engine via a power take-off device, a liquid spray pump linked to the hydraulic motor, and a variable displacement pump linked to the hydraulic drive means. a flow control means for controlling the discharge amount of the hydraulic pump; a detection device for detecting the running speed of the vehicle and the rotational speed of the hydraulic motor or the spray pump; A liquid spraying device for a liquid spraying vehicle, comprising a liquid spraying control means that operates a flow rate control means so as to synchronize the rotational speed of a pump to keep the amount of liquid sprayed per unit area constant.