JPH11123352A - Liquid spraying apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leakage of a liq. being continued for a long time after stopping a pump from occurring. SOLUTION: An oil spraying tank 5 is connected with a spray pipe 16 on which nozzles 19 are uniformly spaced. An electromagnetic on-off valve 34 is provided on the midway of a pipeline between the oil spraying pump 32 and the spray pipe 19 and the oil spraying pump 32 and an electric timer 39 are electrically linked therewith. The electromagnetic on-off valve 34 for spraying oil is opened and closed by being accompanied with driving and stopping of the oil spraying pump 32 and when the oil spraying pump 32 is stopped, the electric timer 39 keeps the electromagnetic valve 34 for spraying oil under open condition for a specified set time to rapidly decrease the pressure of gas oil or surfactant and air in the spray pipe 16 by letting them go to the oil spraying tank 5 and open air and thereby, leakage of liq. being continued for a long time is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an electromagnetic on-off valve which is provided in the middle of a pipe between a pump and a spray pipe, and which switches between open and closed states when the pump stops operating.
An industrial vehicle in which the drive of the pump is stopped and the electromagnetic on-off valve is opened for a certain period of time by the timer means when the electromagnetic on-off valve switches from the open state to the closed state to reduce the pressure in the spray pipe. Liquid spraying device.

[0002]

2. Description of the Related Art A conventional liquid spraying apparatus for an industrial vehicle is disclosed in Japanese Utility Model Publication No. 3-15607. In this, a water tank and a watering pump are connected by a suction pipe, and a watering pump and a watering nozzle for watering to front and rear wheels are connected by a discharge pipe. In order to prevent the water in the water tank from flowing out of the water spray nozzle due to the head pressure after stopping the watering pump, an electromagnetic switching valve for opening and closing the flow path is provided in the middle of the suction pipe connecting the water tank and the watering pump. It is interposed. The watering pump and the electromagnetic switching valve are electrically connected. When the vibration roller (industrial vehicle) moves forward and backward, the watering pump is automatically driven, and accordingly, the electromagnetic switching valve interposed in the middle of the suction pipe. Opens the flow path, pressurized water is supplied to the watering nozzle from the water tank and sprinkled on the front and rear wheels, and when the vibrating roller stops, the watering pump stops and the electromagnetic switching valve closes and the outflow of water stops. To prevent it.

[0003]

SUMMARY OF THE INVENTION In the prior art,
When the sprinkling pump is driven and the electromagnetic switching valve is opened and the sprinkling pump stops and the electromagnetic switching valve is closed, the water in the suction pipe and the discharge pipe and the pressure of the air remaining in the water are reduced by the water pressure of the sprinkling pump. This is a problem that a high pressure state is maintained due to the discharge pressure, which causes a water leak from the water spray nozzle over a long period of time until the pressure of water or air in the suction pipe or the discharge pipe drops after the water spray stops. was there. An object of the present invention is to prevent a long-term liquid leakage from a nozzle by rapidly reducing the pressure of residual air compressed by a discharge pressure of a pump after the pump is stopped.

[0004]

In order to solve the above problems, a nozzle for spraying a liquid is provided on a spray pipe, and the spray pipe and the tank are connected to each other via a pump. An electromagnetic on-off valve is provided in the middle of the pipe of the pump, and the electromagnetic on-off valve and the pump are electrically connected.When the pump is driven, the electromagnetic on-off valve is opened and the liquid is sprayed from the nozzle. In an industrial vehicle liquid spray device configured such that the on-off valve is closed and spraying of liquid from the nozzle is stopped, when the pump is stopped and the electromagnetic on-off valve switches from the open state to the closed state, the electromagnetic on-off valve is set to a predetermined position. Timer means for maintaining the open state during the set time (claim 1).

The predetermined time period is a time period from when the pressure in the spray pipe is stopped until the pressure at which the injection of the liquid from the nozzle is stopped by the pressure in the spray pipe after the pump stops. More specifically, the timer means is an electric timer.

[0006]

Next, an embodiment of the present invention will be described with reference to FIGS. The vehicle body 2 of the compaction roller vehicle 1 shown as an industrial vehicle has a vehicle body front portion 2a and a vehicle body rear portion 2b connected via a link mechanism 3. A rolling roller 4 which is a steel rolling wheel is rotatably supported on the front part 2a of the vehicle body, and an oil dispersion tank 5 in which light oil or oil is sealed is provided above the rolling roller 4. It is arranged.
The pressure roller 4 is driven by an engine (not shown). On the other hand, a driving operation unit 8 including a steering wheel 6, a driver's seat 7 and the like is provided in the rear part 2b of the vehicle body, and a watering tank 9 filled with water is provided below the driver's seat 7.
Are arranged. Further, under the sprinkling tank 9, a rolled tire 10 as a rubber rolling wheel is rotatably supported.

[0007] A spray pipe 11 for spraying water is provided in the front part 2 a of the vehicle body in the vicinity of the pressure roller 4 so as to extend in parallel with the rotation axis of the pressure roller 4, and is attached via a bracket 12. . A plurality of watering nozzles 14 for spraying water toward the surface of the pressure roller 4 at predetermined intervals along the longitudinal direction are attached to the watering spray pipe 11. A spray pipe 15 for spraying water and a spray pipe 1 for spraying oil, which extend in the rear part 2b of the vehicle body near the rolled tire 10 in parallel with the rotation axis of the rolled tire 10.
6 are respectively attached to brackets 17 by a U-shaped attachment member 18 as shown in FIG. these,
Spray pipe 15 for watering and spray pipe 1 for oiling
In the same manner as the spray pipe 11 for watering,
At predetermined intervals along the longitudinal direction, a plurality of watering nozzles 14 for spraying water toward the surface of the compacted tire 10 and an oiling nozzle 19 for spraying light oil or oil agent are attached.

[0008] The watering and oiling nozzles 14 and 19 are attached at equal intervals between the left and right ends of the spray pipes 11, 15 and 16, for example, as shown in FIG. 3. 14 and 19 are spray pipes 15
Are provided at positions corresponding to the center positions of the left and right outer rolled tires 10 and at positions corresponding to the center positions of the left and right inner rolled tires 10. Spray pipe 11, 1
Watering and oiling nozzle 1 attached to the middle part of 5 and 16
Reference numerals 4 and 19 are screwed obliquely downward to the lower outer periphery of the spray pipes 11, 15, and 16. Further, the water spraying to the left and right ends of the spray pipes 11, 15 and 16 and the mounting of the oil spray nozzles 14 and 19 have substantially the same configuration, and therefore, the description will be made herein by the mounting structure of the spray pipe 16 and the oil spray nozzle 19. As shown in FIG. 2, the oil spray nozzles 19 at the left and right ends of the oil spray pipe 16 are connected to the pipe joint 2 screwed so as to close the left and right ends of the oil spray pipe 16.
The inflow pipe 22 of the oil sprinkling nozzle 19 is screwed into the nozzle mounting hole 21 of the tire 0, and is attached to the oil spraying pipe 16 so as to extend diagonally downward. It is fixed so as to be directed toward. A check valve (not shown) which is closed in the middle of the inflow pipe 23 of the oil spray nozzle 19 by a ball urged by a spring during normal operation, and opened by the discharge pressure of the oil spray pump 32 during spraying of the oil agent. Is provided.

Next, the entire liquid spraying device 28 will be described with reference to FIG. A watering tank 9 is connected to the watering spray pipes 11 and 15 by a pipe 30 via a watering pump 29. This pipe 30 is connected downstream of the watering pump 29 with a watering electromagnetic opening / closing valve 31 that is normally urged to be in a closed state (when electricity is not supplied). Also, the pipe 30
Is branched downstream of the watering electromagnetic on-off valve 31,
One of the branch pipes 30a is connected to the spray pipe 11 for spraying water on the side of the pressure roller 4, and the other branch pipe 30a is connected to the branch pipe 30a.
b is connected to the spray pipe 15 for watering on the side of the compacted tire 10. The oiling tank 5 is connected to the oiling spray pipe 16 by a pipe 33 via an oiling pump 32. At the time of non-energization), an oil-spreading electromagnetic on-off valve 34 urged to a closed state is provided.

The watering pump 29 is electrically connected to a power source 36 via a watering switch 35.
Is turned on, the watering pump 29 is driven, and the watering electromagnetic on-off valve 31 is excited to the open state.
The open state is maintained until is turned OFF. The oil-spreading pump 32 and the oil-spreading electromagnetic on-off valve 34 are electrically connected to a power source 36 via an oil-spreading switch 37, and a timer is provided between the oil-spreading switch 37 and the oil-spreading electromagnetic on-off valve 34. An electric timer 39 as a means is electrically connected.

The electric timer 39 comprises a first relay 41 and a second
An electric circuit comprising a relay 40 and a timer 39a, and comprising an electric timer 39, an oiling pump 32, an oiling electromagnetic opening / closing valve 34, an oiling switch 37, and a power supply 36, is shown in detail in FIG. A first relay 41 and a second relay 40 that are connected to the power supply 36 and the oiling switch 37 are electrically connected to each other, and the oiling pump 32 and the timer 3 are connected to the first relay 41.
9a is electrically connected, and the second relay 40 is electrically connected to the oiling electromagnetic on-off valve 34 and the timer 39a. The oiling pump 32 is turned on by turning on the oiling switch 37.
Is driven, and the oil-spreading electromagnetic on-off valve 34 is excited to the open state. The oil-spreading switch 37 is turned on by a spring action.
It automatically returns to the FF state. When the oiling switch 37 changes from the ON state to the OFF state, the electric timer 39 sets a predetermined time from the OFF time (after the oiling pump 32 stops, the pressure in the oiling spray pipe 16 becomes atmospheric pressure). The current is maintained for a period of time until the pressure of the check valve of the oil distribution nozzle 19 becomes equal to or less than the sum of the pressures, and the oil distribution electromagnetic on-off valve 34 is excited to the open state. In addition, the oil distribution switch 37
Are arranged in the driving operation unit 8.

When the watering switch 35 is turned on to prevent asphalt from adhering to the rolling wheels 4 and 10 during the rolling work, water is pumped by the watering pump 29 to the watering spray pipes 11 and 15. The water is sprayed from the watering nozzle 14 toward the surfaces of the rolling wheels 4 and 10. At this time,
If asphalt adheres to the surface of the compacted tire 10 even when water is sprayed on the compacted tire 10 due to a high asphalt temperature or the like, the sprinkling switch 35 is provided to prevent this. Watering is stopped in the OFF state, and oiling to the compacted tire 10 is performed by turning on the oiling switch 37. When the oil-spreading switch 37 is turned on, the oil-spreading pump 32 is driven, and the oil-spreading electromagnetic on-off valve 34 is excited, and the oil-spraying electromagnetic on-off valve 34 is in an open state. Is sprayed by the oiling pump 32.
The check valve opens the inflow conduit 23 and is sprayed from the oil spray nozzle 19 onto the surface of the compacted tire 10. At this time, the remaining air in the oiling spray pipe 16 is compressed by the discharge pressure of the oiling pump 32.

After the oil film is formed on the compacted tire 10, the oil spray switch 37 is turned from the ON state to the OFF state. At this time, the oil spray electromagnetic on-off valve 34 is kept open for the time set by the timer 39a. Spray pipe for dripping oil 16
A pipe 33 between the oil spray tank 5 and the oil spray tank 5 communicates with each other. The pressure of the air compressed by the discharge pressure of the oil spray pump 32 becomes atmospheric pressure and the oil spray nozzle 1
Light oil or oil is sprayed from the oil spray nozzle 19 until the pressure is balanced with the sum of the pressure for closing the inflow line 23 of the check valve in the nozzle 9 and the pressure in the oil spray pipe 16 is rapidly increased. As a result, the liquid leakage from the nozzle, which has been reduced for a long time, is prevented. In the above description, the present invention is applied to an oiling system, but it is needless to say that the present invention can also be applied to a watering system.

[0014]

As described above, according to the present invention, when the pump is stopped, the open state of the solenoid on-off valve which switches from the open state to the closed state is maintained for a predetermined set time by the timer means. The pressure of the liquid and the residual air is released to the pump, and the liquid is ejected from the nozzle and the pressure of the liquid and the residual air in the spray pipe is rapidly increased until the air pressure becomes a pressure at which the liquid does not eject from the nozzle. Since the pressure is lowered, it is possible to prevent a long-term liquid leakage in which the liquid gradually leaks from the nozzle due to the air pressure after the conventional pump is stopped.

[Brief description of the drawings]

FIG. 1 is a side view of a compaction roller wheel.

FIG. 2 is an explanatory diagram showing a mounting structure of a nozzle.

FIG. 3 is a perspective view of FIG.

FIG. 4 is an explanatory view of the entire liquid spraying apparatus.

FIG. 5 is an explanatory diagram showing a part of an electric circuit of the liquid spray device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rolling roller car (industrial vehicle) 5 Oil spray tank 9 Water spray tank 11, 15 Spray pipe for water spray 14 Spray nozzle 16 Spray pipe for oil spray 19 Oil spray nozzle 28 Liquid spray device 29 Water spray pump 32 Oil spray pump 34 Electromagnetic opening and closing Valve 39 Electric timer (timer means)

Claims (3)

[Claims] 1. A nozzle for spraying a liquid is provided on a spray pipe, and the spray pipe and a tank are connected with a pipe via a pump, and an electromagnetic on-off valve is provided in the middle of the pipe between the spray pipe and the pump. The electromagnetic on-off valve and the pump are electrically connected, and when the pump is driven, the electromagnetic on-off valve is opened and the liquid is sprayed from the nozzle,
When the pump is stopped, the electromagnetic on-off valve is closed and the spraying of liquid from the nozzle is stopped.In the liquid spraying device of an industrial vehicle, when the pump is stopped and the electromagnetic on-off valve switches from the open state to the closed state, A liquid spray apparatus for an industrial vehicle, further comprising timer means for keeping an electromagnetic on-off valve open for a predetermined set time. 2. The method according to claim 1, wherein the predetermined time period is a time period from when the pressure in the spray pipe is stopped until the pressure at which the injection of the liquid from the nozzle is stopped by the pressure in the spray pipe after the pump is stopped. Item 2. A liquid spray device for an industrial vehicle according to Item 1. 3. The liquid spray apparatus for an industrial vehicle according to claim 1, wherein the timer means is an electric timer.