JPH08253908A - Liquid-spraying apparatus for industrial vehicle - Google Patents

Abstract

PURPOSE: To prevent liquid from leaking through nozzles in the condition that water spray is stopped, by a method wherein a nozzle of which the water- guiding pipe is inserted into the flowing-in hole of a flowing-in pipe and is fastened thereto, is screwed directing its head downward to a spray pipe, and the top end of an inlet for the nozzle is extended to the upper part of the inside of a spray pipe. CONSTITUTION: The opening level of the top end of a pipe, which acts as an inlet for a nozzle 16, is positioned at the upper part of the inside of a spray pipe 8. In this way, the inside of the spray pipe 8 is filled with water supplied in the spray pipe 8, following which the water is supplied to the nozzles 16. Air in the spray pipe 8 is pushed-out to the inlets for the nozzles 16 by water pressure and is atomized from the nozzles 16 together with the water, and hence the air does not stay behind in the spray pipe 8. Thus the water pressure in the spray pipe is immediately lowered, water spray from the nozzles 16 is instantaneously stopped and water is prevented from leaking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention collects water and oil in a tank,
It is a liquid spraying device that pumps it to a spray pipe and ejects it from a nozzle attached to the spray pipe, and in particular, the spray pipe is fixed in a horizontal position on a vehicle such as a cleaning car or a roller compactor roller for road paving. The present invention relates to a liquid spraying device for an industrial vehicle.

[0002]

2. Description of the Related Art Conventionally, in an industrial vehicle, for example, in the case of a compaction roller vehicle, water in a water tank arranged above a compaction tire which is a rear wheel is horizontally arranged in front and rear by a pump arranged on a vehicle body. As shown in FIG. 7, the spray pipe 8 is connected to the discharge passage 9c, and the lower portion of the spray pipe 8 is screwed and attached at intervals in the longitudinal direction to the front and rear wheels. A liquid spraying device for spraying the outer peripheral surface is mounted. Further, in a tire roller vehicle for asphalt pavement, a liquid such as light oil or oil is sprayed on the tire in order to prevent the tire from adhering to the tire by a similar method.

[0003]

Since the suction port of the nozzle is open to the inner wall surface of the lower part of the spray pipe, the water supplied to the spray pipe is supplied to the nozzle through the lower part of the spray pipe and sprayed. The air accumulated on the upper part of the pipe remains without being discharged. The air in the spray pipe is compressed by the discharge pressure of the pump. Therefore, when the pump is stopped and the injection of the liquid is stopped, the water in the spray pipe is injected from the injection port of the nozzle after the pump is stopped by the pressure of the air remaining in the spray pipe, causing liquid leakage.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to prevent fluid injection from a nozzle after a pump is stopped, and the structure is such that the tip of the inlet of the nozzle is inside the pipe of the spray pipe. Located in the upper space at
This is to prevent air from remaining in the spray pipe. The nozzle is attached to the lower side of the spray pipe, and an extension having a length reaching the upper part of the pipe is provided at the inlet, or at the outer periphery of the spray pipe, one end is opened to the upper part of the spray pipe. It is possible to open the inlet of the nozzle to the upper part in the spray pipe by attaching a water conduit to the nozzle and attaching a nozzle to the other end of the water conduit.

[0005]

[Operation] By opening the inlet of the nozzle on the upper surface of the spray pipe where air is likely to collect, the air collected at the upper part is pushed out by the pressure of the liquid to the inlet, and the air remains in the spray pipe. Never. Therefore,
When the pump is stopped and the fluid supply to the spray pipe is stopped, the fluid ejection from the nozzle is immediately stopped.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which a liquid spraying device according to the present invention is implemented by a compaction roller wheel will be described with reference to the drawings. First, a roller compaction roller will be described. As shown in FIGS. 1A and 1B, a vehicle body 2 having a driving operation unit 1 such as a steering wheel at the center has a compaction roller 3 as a front wheel at the front.
The support frame 2a is provided so as to be rollable, and has a rear portion, which rollably supports a compaction tire 4 as a rear wheel.
However, it is attached so that it can be steered in the left-right direction. The compaction tire 4 is used as a driving wheel, and the rotation of an engine (not shown) is transmitted to the driving wheel. In addition, the vehicle body 2 has a seat 5 at a position corresponding to an upper portion of the compaction tire 4.
Is attached.

In the vehicle body 2, a water tank 6 is provided under the seat 5, and a centrifugal pump having an impeller is provided at a position lower than the water tank 6 between the two compaction rollers 3 and 4. 7
Is provided, and spray pipes 8, 8 are arranged parallel to the axes of the respective pressure rollers 3, 4 at positions closer to the outer peripheral surfaces of the respective pressure rollers 3, 4. The front spray pipe 8 is attached to the vehicle body 2, and the rear spray pipe 8 is attached to the support frame 2a. A water sprinkler is configured by connecting the water tank 6, the pump 7, and the spray pipe 8 through the flow path 9. The car body 2
In the case of a rolling roller vehicle in which the front body and the rear vehicle body are rollably supported by rolling rollers, respectively, and the rear vehicle body is steerably connected to the front vehicle body, The spray pipes 8 and 8 are attached to the front and rear vehicle bodies, respectively.

Next, the water sprinkler will be described in detail. In FIG. 2, the water tank 6 is provided with a water supply port 6a at its upper part and is normally closed by a lid 6b. A suction passage 9a communicating with the suction inlet 7a of the pump 7 is connected to the pump outlet of the water intake portion 6c, which is recessed in the lower portion of the bottom, and is formed in the upper wall of the pump chamber of the pump 7. An extension pipe 9c of an air vent passage 9b connected to the air vent hole 10 is penetrated, and the extension pipe 9c is fixed to the water tank 6 so as to extend straightly upward in the water tank, and the air exhaust at the tip is exhausted. The outlet 11 is opened in the upper part of the tank. A check valve 12 is inserted and connected to the air vent channel 9b so as to be closed when a constant water pressure (water pressure due to the drop between the water tank and the pump) is applied from the pump side.

The discharge port 7b of the pump 7 and each of the spray pipes 8 and 8 have a discharge passage 9d provided with a switching valve 13.
The check valve 14 is connected to the discharge passage 9d.
And the filter 15 are respectively inserted and connected. Further, a plurality of nozzles 16, 16 for ejecting water to the surfaces of the respective pressure rollers 3, 4 are attached to the respective spray pipes 8, 8.

The nozzle 16 is, as illustrated in FIG.
The hole provided on the lower outer periphery of the spray pipe 8 is approximately 45
The nozzle 1 is installed by screwing it diagonally downward.
A water guide pipe 16b made of synthetic resin is inserted and fixed in the inflow hole of the inflow pipe 16a in No. 6 by using elastic force, whereby the tip of the inflow port of the nozzle 16 extends to the upper part in the spray pipe 8. It has been done. The tip of the water pipe 16a is cut obliquely so that the opening surface has an angle close to horizontal.

In the liquid spraying device thus formed,
When the pump 7 is started, the water in the water tank 6 is sucked and discharged from the discharge port 7b, the check valve 14 is opened by the discharge pressure, and the spray pipes 8 and 8 selected by the switching valve 13 are selected. Nozzle 16, 16 attached to the spray pipe 8, (8)
Ejected from. Even when the water in the water tank is used up, the pump 7 is located at a lower position than the water tank 6, and the air vent hole 10 formed in the upper portion of the pump 7 is provided with the check valve 12. Withdrawal channel 9
Since b is connected, when water is supplied into the water tank 6,
The air in the pump 7 is automatically discharged from the air vent channel 9b, and after the air is discharged, the check valve 12 is automatically closed by water pressure, and the spray can be immediately sprayed only by starting the pump.

Since the opening surface at the tip of the pipe, which is the inlet of the nozzle 16, is located in the upper part of the spray pipe 8,
The water supplied into the spray pipe 8 is filled into the spray pipe 8 and then supplied to the nozzles 16, and the air in the spray pipes 8 is hydraulically pushed out to the inlets of the nozzles 16 and together with the water. Then, it is ejected from the nozzle 16 and no air remains in the spray pipe 8. Therefore, when the pump is stopped, the water pressure in the spray pipe immediately decreases, the jet of water from the nozzle is stopped instantaneously, and water leakage does not occur.

In the above-described embodiment, the water guide pipe is inserted and fixed to the tip of the nozzle to extend the inflow port of the nozzle to a length reaching the upper part in the spray pipe 8. Therefore, it is necessary to change the mounting position of the nozzle. Not only that, but it can be realized simply by inserting and fixing the introduction pipe into the conventional nozzle.
Incidentally, as illustrated in FIG. 4, a nozzle 16 ′ in which an inflow pipe 16c having a threaded portion 17 is integrally extended is adopted, or as illustrated in FIG. The water pipe 8a is integrally provided by welding such that one end of the water pipe 8a opens into the upper space of the spray pipe 8,
The form of the extension can be changed as appropriate, for example, by screwing and fixing the nozzle 16 to the other end of the water conduit 8a.

In each of these embodiments, the nozzle is attached to the lower part of the spray pipe, but as shown in FIG. 6, the upper end of the spray pipe 8 communicates with the inside of the spray pipe 8 and the tip thereof is connected. It is also possible to adopt a structure in which a curved pipe 18 exemplified as a water pipe directed obliquely downward is integrally provided by welding, and the nozzle 16 is screwed and fixed to the tip of the curved pipe 18. With such a structure, when the spray pipe 8 is horizontally arranged,
Air is preferentially pushed into each nozzle. Also, even if the spray pipe is installed in an inclined shape or the vehicle is tilted to the left or right, there are multiple nozzles in the longitudinal direction of the spray pipe, so the air gathers in the highest part and reaches the shortest distance. It is discharged from a nozzle. Note that the liquid spraying device of this embodiment sprays water, but even a device spraying a liquid such as oil can be expected to have similar effects with the same configuration. A centrifugal pump is used in the spraying device of the embodiment, but a gear pump and other pumps can be used, and the nozzle mounting structure is not limited to the embodiment.

[0015]

According to the present invention, the air in the spray pipe can be quickly introduced into the inlet of the nozzle and discharged, so that the air can be prevented from remaining in the spray pipe and the pump is stopped. It is possible to immediately stop the ejection of the liquid from the nozzle, and to eliminate the liquid leakage that is called back drip.

[Brief description of drawings]

1A and 1B are explanatory views of a compaction roller vehicle equipped with a liquid spraying device according to the present invention.

FIG. 2 is an explanatory diagram of a liquid spraying device.

FIG. 3 is an explanatory view showing a nozzle mounting structure.

FIG. 4 is an explanatory diagram showing a modified example of a nozzle mounting structure.

FIG. 5 is an explanatory diagram showing a modified example of a nozzle mounting structure.

FIG. 6 is an explanatory diagram showing a modified example of a nozzle mounting structure.

FIG. 7 is an explanatory diagram of a conventional example.

[Explanation of symbols]

1 ... Driving operation part, 2 ... Car body, 3 Rolling roller, 4
..Rolled tires, 5 ... Seats, 6 ... Water tanks, 6a
・ Water supply port, 6b ・ ・ Intake part, 7 ・ ・ Pump, 7a ・ ・ Suction port, 8 ・ ・ Spray pipe, 8a ・ ・ Water pipe, 9
..Flow passages, 9a..Intake passages, 9b..Air bleeding passages, 9c..Extension pipes, 9d..Discharge passages, 10 ...
Air vent hole, 11 ... Air discharge port, 12 ... Check valve, 13 ... Switching valve, 14 ... Check valve, 15 ... Filter, 16, 16 '... Nozzle,
16a, 16c ... inflow pipe, 16b ... water transfer pipe, 1
7 ・ ・ Screwed part, 18 ・ ・ Curved pipe.

Claims (3)

[Claims] 1. A liquid spraying apparatus for an industrial vehicle in which a liquid in a tank is jetted from a nozzle by a pump through a spray pipe, and an inlet end of the nozzle is located in an upper space in the pipe of the spray pipe. Liquid spray device for industrial vehicles. 2. The liquid spraying apparatus for an industrial vehicle according to claim 1, wherein the nozzle is attached to a lower side of the spray pipe, and an extension of a length reaching an upper portion of the pipe is provided at an inlet of the nozzle. 3. A spray pipe is provided with a water guide pipe, one end of which is open to the upper part in the pipe, the nozzle is attached to the other end of the water pipe, and an inlet of the nozzle is opened to the upper part of the pipe. The liquid spraying apparatus for an industrial vehicle according to claim 1, wherein the liquid spraying apparatus is used.