JPH0710024U - Liquid sprayer liquid sprayer - Google Patents

Abstract

(57) [Summary] [Purpose] The liquid spray amount of the liquid spray car is synchronized with the vehicle speed,
The amount of liquid sprayed per unit area can be controlled to be substantially constant. In a liquid spraying vehicle, a spraying pressure of a spraying pump Pf and a vehicle speed are detected, and the oil discharge amount of a variable displacement hydraulic pump Po is continuously increased / decreased based on the detected values. As a result, the amount of liquid sprayed by the liquid spray pump Pf is synchronized with the vehicle speed via the constant displacement hydraulic motor Mo.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid spraying device for a liquid spraying vehicle, which sprays water or antifreezing liquid on a road.

[0002]

[Prior art]

 In the liquid spraying device for the liquid spraying vehicle, the liquid spraying amount is automatically controlled so as to be synchronized with the running speed of the vehicle so that the spraying amount per unit area is substantially constant. It is well known (see Japanese Utility Model Publication No. 2-2726 and Japanese Utility Model Publication No. 4-7217).

[0003]

[Problems to be solved by the device]

 In this type of liquid sprayer for liquid sprayers, the number of revolutions of the spray pump and the vehicle speed are detected, and the oil discharge amount of the variable displacement hydraulic pump is controlled continuously based on the detected values. By doing so, the amount of liquid sprayed by the liquid spray pump is controlled via the constant displacement hydraulic motor so as to be synchronized with the vehicle speed.

By the way, in the conventional method for detecting the amount of liquid sprayed by the liquid spraying vehicle, the number of rotations of the liquid spraying pump is detected, so that pump performance is caused by wear of the impeller of the liquid spraying pump or the like. If there is a drop in the liquid flow rate or there is a liquid leak in the liquid spray circuit downstream of the pump, there is not only the problem that the amount of liquid spray synchronized with the vehicle speed cannot be secured, but there is also a rupture accident in the liquid spray circuit. There is also another problem that the driver may unknowingly discharge a large amount of liquid unnecessarily when it occurs.

The present invention solves such a problem and is capable of spraying a spray amount always in tune with the vehicle speed, and quickly when an accident such as a liquid leak or burst occurs in the spray circuit downstream of the spray pump. It is an object of the present invention to provide a new liquid spraying device for a liquid spraying vehicle, which can notify the driver of this and solve the above-mentioned problems.

[0006]

[Means for Solving the Problems]

 To achieve the above object, the features of the present invention include a variable displacement hydraulic pump driven by a traveling engine supported by a chassis through a power take-off device, and a constant displacement hydraulic pump driven by the pump. Type hydraulic motor, a sprinkling pump rotatably driven by the hydraulic motor, a sprinkling nozzle connected to the discharge side of the sprinkling pump via a sprinkling circuit, and a suction circuit on the suction side of the sprinkling pump. A liquid tank connected via a pressure detecting means for detecting the pressure of the liquid flowing in the liquid spattering circuit, and a power transmission system connecting the transmission of the engine and the drive wheels. Vehicle speed detecting means for detecting vehicle speed from the vehicle, flow rate control means connected to the variable displacement hydraulic pump for increasing / decreasing the discharge amount of the pump, and detection signals for the pressure detecting means and vehicle speed detecting means. And a sprinkling control means for controlling the operation of the flow rate control means based on the operation of the flow rate control means to control the amount of oil discharged from the hydraulic pump so that the sprinkling pump is operated by the sprinkling nozzle from the sprinkling nozzle. The aim is to synchronize the amount of sprayed liquid discharged with the vehicle speed.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

First, referring to FIGS. 1 to 5, a first embodiment of the present invention will be described. FIG. 1 is a schematic side view of a liquid spraying vehicle equipped with the device of the present invention, and FIG. FIG. 3 is a sprinkling control system diagram, FIG. 4 is a vehicle speed tuning and sprinkling block diagram, and FIG. 5 is a sprinkling pressure-vehicle speed diagram.

In FIG. 1, a liquid spraying vehicle V for spraying water, antifreeze chemicals, etc. on a road has a liquid tank T mounted on its chassis F, and a driver's cab C in front of the chassis F. Is set up. A traveling engine 1 is supported on a chassis F below the cab C, and an output shaft 3 extends rearward from a transmission 2 at the rear end of the engine 1. The output shaft 3 includes a parking brake 4 and a joint. 5 is connected to a propeller shaft 6 and the rear end of the propeller shaft 6 is connected to the left and right rear wheels 8 via a differential device 7. According to the normal operation of the engine 1, the left and right rear wheels are connected. 8 is driven and the liquid spraying vehicle V is driven.

Next, the structure of the liquid spraying device will be described mainly with reference to FIG. 2. The liquid spraying pump Pf for spraying the liquid contained in the liquid tank T 1 on the road is driven by the traveling engine 1. Drive control is performed via the hydraulic drive means Do. A power take-off device (flywheel PTO) 9 is connected to one side of the running engine 1. The output end of the power take-off device 9 is connected to the input end of the hydraulic drive means Do, and the output end thereof is connected to the sprinkling pump Pf. The hydraulic drive unit Do is configured by a combination of a variable displacement hydraulic pump Po and a constant displacement motor Mo. The hydraulic pump Po is a variable displacement swash plate type axial plunger pump. The motor Mo is a constant displacement type swash plate type axial plunger motor, and the oil discharge amount of the pump Po is controlled steplessly by the inclination angle control of the swash plate 10 of the hydraulic pump Po, whereby the rotation of the hydraulic motor Mo is controlled. The number is continuously controlled. Since the hydraulic pump Po and the hydraulic drive unit Do composed of the hydraulic motor Mo are well known in the art, a detailed description thereof will be omitted.

The suction side of the spray pump Pf is connected to the outlet of the liquid tank T via a suction circuit 11, and the discharge side thereof is connected to the spray circuit 12. The sprinkling circuit 12 extends along the front-rear direction of the chassis F, and an appropriate sprinkling nozzle 13 is connected thereto. Then, when the sprinkling pump Pf is driven, the stored liquid in the liquid tank T is sucked and pressurized by the pump Pf via the suction circuit 11, and the pressurized liquid is dispersed via the sprinkling circuit 12. It can be sprayed on the road from the liquid nozzle 13.

The number of revolutions of the spray pump Pf is automatically controlled to increase or decrease in accordance with the traveling speed of the liquid spraying vehicle V, and the spraying amount of the liquid spraying vehicle V is synchronized with the running speed to spray liquid per unit area. The amount can be controlled to be substantially constant, and the traveling drive system of the liquid sprinkling vehicle V is provided with vehicle speed detecting means Dv for detecting the vehicle speed, and in the middle of the sprinkling circuit 12. Is provided with a pressure detecting means Dp.

The vehicle speed detection means Dv is composed of an electromagnetic rotation detector, and this detector is connected to the transmission 2 of the engine 1 in the middle of a rotation system 15 for an existing speedometer 14 which has a gear. It is mounted via the box 16, and the rotation speed of the output shaft of the transmission 2 is detected by this, and the vehicle speed of the liquid spray vehicle can be detected based on this.

Further, the liquid pressure detecting means Dp is composed of a pressure sensor, and is attached to a pressure detecting circuit 17 connected in the middle of the liquid spraying circuit 12, and the liquid pressure detecting means Dp flows through the liquid spraying circuit 12 by this pressure sensor. The spray pressure can be detected, and the flow rate of the spray from the spray nozzle 13 can be detected based on this.

In FIG. 2, 18 is a liquid amount detection circuit, 19 is a level switch, and 20 is an alarm circuit.

The detection signals from the vehicle speed detection means Dv and the hydraulic pressure detection means Dp are both transmitted to the liquid dispersion control means Cr provided in the cab C. In the sprinkling control means Cr, both detection values are arithmetically processed in the arithmetic processing circuit 21 as shown in FIG. 3, and the output signal from the arithmetic processing circuit 21 passes through the command output circuit 22 and the flow rate of the hydraulic pump Po. It is transmitted to the control means Cf. Then, the control signal from the flow rate control means Cf operates the swash plate operating mechanism 10 ₁ of the pump Po to change and control the tilt angle of the swash plate 10 to continuously increase or decrease the rotational speed of the hydraulic motor Mo. Therefore, the discharge amount of the spray pump Pf can be controlled to be increased or decreased. Specifically, if the vehicle speed of the liquid spray vehicle V increases and the spray amount per unit area tends to decrease, the spray pump If the spraying flow rate of Pf is automatically increased, and if the vehicle speed of the liquid spraying vehicle V decreases and the spraying flow rate per unit area tends to increase, the spraying flow rate of the spray pump Pf is automatically reduced. As a result, it is possible to automatically increase / decrease the amount of liquid dispersion according to the vehicle speed.

As shown in FIG. 4, the sprinkling amount command signal is determined based on the vehicle speed signal, the sprinkling amount setting signal, and the lane width setting signal, and the sprinkling measurement signal is determined by the sprinkling pressure signal. . Then, the sprinkling control means Cr outputs a rotation control signal to be applied to the flow rate control means Cf based on the sprinkling amount command signal and the sprinkling amount measurement signal.

FIG. 5 is a diagram showing the relationship between the vehicle speed (km / hr) of the liquid spraying vehicle V and the pump pressure (kg · f / cm ² ) of the spraying pump Pf for each of 1 to 3 lanes. Shown. Two lanes are when the vehicle V is traveling in the traveling lane and sprinkles in both the traveling lane and the overtaking lane, and three lanes are when the vehicle V is traveling in the overtaking lane and traveling lanes on both sides of the lane. It shows the case of spraying on the line and other overtaking lanes. As can be seen from this diagram, as the vehicle speed increases, the spray pressure of the pump is controlled to increase substantially proportionally, and the pump pressure with respect to the vehicle speed is as shown in Fig. 5 depending on the number of lanes sprayed.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various embodiments can be made within the scope of the present invention. For example, in the above-described embodiment, the case where the pressure sensor as the liquid detecting means is provided in the liquid spraying circuit has been described, but this may be provided in the pipe line connecting the liquid spraying nozzle, and the vehicle speed detecting means is the transmission. It may be provided in the power transmission system thereafter.

[0020]

[Effect of device]

 As described above, according to the present invention, a variable displacement hydraulic pump driven by a traveling engine supported by a chassis through a power takeoff device, and a constant displacement hydraulic motor rotationally driven by the pump, A sprinkling pump rotatably driven by the hydraulic motor, a sprinkling nozzle connected to the discharge side of the sprinkling pump via a sprinkling circuit, and a suction side of the sprinkling pump to the suction side of the sprinkling pump. A liquid tank, a pressure detecting means connected in the middle of the liquid spraying circuit to detect the pressure of the liquid flowing in the circuit, and a vehicle speed from a power transmission system connecting the engine transmission and the drive wheels. Vehicle speed detecting means for detecting, flow rate controlling means connected to the variable displacement hydraulic pump to control the discharge amount of the pump, and the flow rate controlling means based on the detection signals of the pressure detecting means and the vehicle speed detecting means. And a sprinkling control means for controlling the operation of the stage, which controls the oil discharge amount of the hydraulic pump by the operation of the flow rate control means to discharge the spout from the sprinkling nozzle from the sprinkling nozzle via the sprinkling circuit. The amount of liquid discharge is synchronized with the vehicle speed. The liquid flow rate can be automatically increased / decreased in response to the vehicle speed, and the liquid distribution work can be performed easily and quickly. However, even if the pump performance deteriorates due to wear of the impeller, etc., the liquid pressure detection means can accurately detect the flow rate of the liquid sprayed from the liquid spray nozzle to control the amount of liquid sprayed in response to the vehicle speed. It is possible to greatly increase the level, and quickly detect abnormalities in the spray pressure due to leakage of the spray from the spray circuit, rupture of the spray circuit, or blockage of the hydraulic circuit, and then take the following measures promptly. And prevent accidents from occurring. It can be.

[Brief description of drawings]

FIG. 1 is an overall schematic side view of a liquid spraying vehicle equipped with the device of the present invention.

FIG. 2 is an overall schematic configuration diagram of the device of the present invention.

[Figure 3] Dispersion control system diagram

[Fig. 4] Block diagram of vehicle speed tuning

FIG. 5: Spray pressure-vehicle speed diagram

[Explanation of symbols]

 1-Engine 2-Transmission 8-Rear Wheel (Drive Wheel) 9-Power Extraction Device 11-Suction Circuit 12-・ ・ ・ Spraying circuit 13 ・ ・ ・ ・ ・ Spraying nozzle Cf ・ ・ ・ Flow rate control means Cr ・ ・ ・ Spraying control means Dp ・ ・ ・ ・ ・ Liquid pressure detection means Dv ・ ・ ・ ・ ・Vehicle speed detection means Dr ・ ・ ・ Spray pump rotation speed detection means F ・ ・ ・ ・ ・ ・ Car chassis Mo ・ ・ ・ Constant capacity hydraulic motor Pf ・ ・ ・ ・ ・ Sprinkle pump Po ・ ・ ・ ・ ・Variable displacement hydraulic pump T ・ ・ ・ ・ ・ ・ Liquid tank

Claims (1)

[Scope of utility model registration request] 1. A variable displacement hydraulic pump (Po) driven by a traveling engine (1) supported by a chassis (F) via a power take-off device (9), and rotationally driven by the pump (Po). Constant-capacity hydraulic motor (Mo) and a sprinkling pump (P) rotatably driven by the hydraulic motor (Mo)
f) and the spray circuit (1) on the discharge side of the spray pump (Pf).
2), a liquid spray nozzle (13), a liquid tank (T) connected to the suction side of the liquid spray pump (Pf) through a suction circuit (11), and the liquid spray circuit (T). 12)
Power transmission for connecting the transmission (2) of the engine (1) and the drive wheel (8) with the pressure detection means (Dp) connected to the middle of the circuit for detecting the pressure of the liquid flowing in the circuit (12). A vehicle speed detecting means (Dv) for detecting a vehicle speed from a system, a flow rate controlling means (Cf) connected to the variable displacement hydraulic pump (Po) for increasing / decreasing the discharge amount of the pump (Po), and the pressure detecting means. Means (Dp) and a liquid sprinkling control means (Cr) for controlling the operation of the flow rate control means (Cf) based on the detection signals of the vehicle speed detection means (Dv). The oil discharge amount of the pump (Po) is controlled to control the spray pump (P).
From f) via the spray circuit (12) the spray nozzle (13)
A liquid spraying device for a liquid spraying vehicle, characterized in that the amount of sprayed liquid discharged is synchronized with the vehicle speed.