JPH0913311A - Sprayer of rolling compactor - Google Patents

Abstract

PURPOSE: To increase the workability, by providing a feed pipe connected to the delivery side of a pump at one end thereof, to return a liquid to a liquid tank from the other end, a spray nozzle installed in the feed pipe and an adjusting valve controlling the flow rate of liquid to the nozzle and the feed pipe. CONSTITUTION: A three-way changeover solenoid valve 11 is actuated at the same time with drive of a pump to open a check valve 9 and a liquid is sprayed from a nozzle 5 to a rolling compactor wheel to prevent asphalt from sticking to the compactor. The spraying volume is adjusted by a flow rate adjusting valve 20 and excess fluid is returned to a tank 1 through a return pipe 16. In this time, since the valve 20 can be manipulated while watching the spraying condition, an appropriate spraying condition can be kept and since the valve 20 is installed at the downstream side adjacently to the nozzle 5, the spray volume can be controlled almost without timelag when the opening of valve is adjusted. Further, the valve 11 is changed over at the same time with a halt of the pump and the liquid in the pipe 4 is returned to the tank 1 through the valves 11, 20 and hence, the valve 9 is closed instantly. In this way, the spray volume can be easily adjusted and the liquid can be prevented from dripping before and after spraying.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spraying device for spraying a liquid onto a compaction wheel or the like of a compacting machine, and in particular, it is possible to prevent the liquid from dripping at the start and stop of spraying, and at the same time, to spray from a nozzle. The present invention relates to a spraying device for a compaction machine capable of adjusting the injection amount while checking the state.

[0002]

2. Description of the Related Art When asphalt paving a road or the like, when a tire of a compaction machine or an iron wheel is used to compact the pavement surface, a heated asphalt mixture (hereinafter referred to as asphalt) adheres to the compaction surface of the compaction wheel, If the compaction is continued as it is, the deposits adversely affect the pavement quality. Therefore, in general, a spraying device is attached to a compaction machine, and water, oils, or a special anti-adhesive agent (hereinafter simply referred to as a liquid) is sprayed onto the compaction wheel by the spraying device to prevent asphalt from adhering. ing.

As a conventional atomizing device for a compaction machine, for example, the one disclosed in Japanese Utility Model Laid-Open No. 5-12324 is known. This one, as shown in Figure 6,
A pump 2 is mounted on a compaction machine, and a nozzle 5 and a check valve 9 for injecting liquid to the compaction wheel T _R are attached to an end of a discharge side liquid-delivery pipe 4 of the liquid-delivery pipe. An energization-closed two-way switching solenoid valve 11 is inserted in the middle of the pressure relief pipe 10 that branches from 4 and returns to the tank 14. When the switch 8 is turned on, the drive motor 3 of the pump 2 and the solenoid valve 11 are energized to start the pump 2 and the solenoid valve 11 is closed, so that the liquid supply pipe 4 is filled with the liquid in the tank 1. When the pressure of the liquid feed pipe 4 rises to a predetermined pressure, the check valve 9 is pushed open to bring the liquid feed pipe 4 into conduction, and the liquid is jetted from the nozzle 5 to start spraying. On the other hand, when the switch 8 is turned off, the pump 2 is stopped, and at the same time, the switching valve 11 is opened and the pressure relief pipe 10 is electrically connected,
The liquid in the liquid supply pipe 4 is discharged to the tank 1 and the pressure rapidly drops. As a result, the check valve 9 shuts off the conduction of the return liquid supply pipe 4 by the force of the spring. The check valve 9 opens and closes instantly in response to a rapid change in pressure in the liquid supply pipe 4 to prevent liquid “dripping” or “dripping” from the tip of the nozzle 5. ..

In FIG. 7, a manual valve 15 is used in place of the above two-way switching solenoid valve 11 to adjust the flow rate returning from the circuit between the pump 2 and the nozzle 5 to the tank 1. The flow rate of the spray from the nozzle 5 is adjusted by adjusting the throttle.

[0005]

In the conventional atomizing device for a compacting machine described above, for example, in the case of FIG. 6, the solenoid valve 11 is automatically closed instantly upon the start of the pump 2 and immediately sent. The pressure in the liquid pipe 4 is increased, and the solenoid valve 11 automatically opens instantly at the same time as the pump 2 is stopped, so that the pressure in the liquid supply pipe 4 immediately drops. The response of the valve 9 is good and no dripping occurs. However, since the solenoid valve 11 is only fully opened and fully closed, there is a problem that the spray amount of the nozzle 5 cannot be arbitrarily adjusted.

On the other hand, in the case of FIG. 7, it is possible to adjust the throttle amount of the manual valve 15 to adjust the liquid injection amount from the nozzle 5. However, since the opening and closing is performed manually, the pump 2 is started. There is a problem in that the pressure in the liquid supply pipe 4 cannot be instantaneously changed in response to the stop, and therefore the response of the check valve 9 becomes poor and it is difficult to completely prevent liquid dripping. .

The manual valve 15 for adjusting the spray amount of the nozzle 5 is attached to the upstream side of the nozzle as close to the pump 2 as possible by shortening the pipe length, and is separated from the nozzle 5. Therefore, when the flow rate adjusting operation is performed by the manual valve 15, there is a problem that a lag occurs until the spray pressure of the nozzle 5 becomes constant and the responsiveness from the switch operation to the nozzle spray start is not good.

Furthermore, it is difficult for an operator to adjust the spray amount with the manual valve 15 while directly observing the injection state of the nozzle 5 directly, and the operability is not good.
Further, in both cases of FIG. 6 and FIG. 7, the liquid sent to the nozzle 5 via the liquid sending pipe 4 is stagnant in the pipe line while the nozzle is closed, so that solid impurities in the liquid are deposited. However, there is a problem that the circuit is frequently blocked by being attached to the valve seat of the check valve or the ejection hole at the tip of the nozzle 5.

Therefore, the present invention has been made by paying attention to the problems of the conventional spraying device of the compacting machine, and it has a good responsiveness and can be adjusted while confirming the injection state from the nozzle. Moreover, it is an object of the present invention to provide a spraying device for a compaction machine in which circuit blockage is less likely to occur due to retention near the nozzle.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a pump for supplying a liquid from a liquid tank, and a liquid feed pipe for connecting one end to the discharge side of the pump and returning the other end to the liquid tank. And a flow rate adjusting valve for adjusting the flow rate of the liquid in the liquid transfer pipe, the nozzle being disposed in the liquid transfer pipe for spraying the liquid onto the pressure roller of the compaction machine. is there.

Here, the flow rate adjusting valve may be arranged downstream of the nozzle. Further, the position where the flow rate adjusting valve is arranged can be near the position where the nozzle attached to the liquid supply pipe is attached. Further, a three-way switching valve can be used as the flow rate adjusting valve, and one of the directions can be drained.

In addition, the pump for starting the pump is connected to the liquid delivery pipe.
A direction switching solenoid valve may be provided to switch the flow path between the nozzle and the tank return pipe depending on the stop. Further, a check valve is installed between the nozzle and the liquid supply pipe, which connects the liquid in the liquid supply pipe to the spray port of the nozzle when the pressure in the liquid supply pipe rises to a predetermined pressure. Can be one.

Further, a check valve and a filter for conducting the liquid in the liquid feed pipe to the spray port of the nozzle when the pressure in the liquid feed pipe rises to a predetermined pressure, a check valve for connecting the nozzle and the liquid feed pipe are provided. It may be attached between them.

[0014]

According to the present invention, a flow rate adjusting valve for adjusting the spray amount of the nozzle is arranged downstream of the nozzle attached to the liquid feeding pipe to control the flow rate. By this method, the flow rate can be adjusted at a position extremely close to the nozzle, and the worker controls the flow rate while directly checking the spray amount (spray state) of the nozzle with eyes. Further, there is little time lag between the flow rate adjusting operation and the change in the spray amount of the nozzle, and the response characteristic of the flow rate adjustment is good.

The liquid sent from the pump is adjusted by the flow rate adjusting valve to be sprayed at a predetermined amount, and the excess liquid is returned to the tank through the return pipe and pumped again to be circulated. By circulating the liquid in this way, deposition of solid impurities in the liquid is removed and cleaning is performed. When the spraying ends and the liquid supply is stopped, the liquid accumulates in the liquid supply pipe or the nozzle, and the solid impurities are likely to be deposited. In that case, if a three-way switching valve is used as the flow rate control valve and one of the ports is drained, the remaining two ports are constantly used to fluidly circulate the liquid through the nozzle during the spraying process to deposit the liquid. prevent. When the pump is stopped and spraying is stopped, the outlet of the flow rate control valve is switched to the drain side to drain the residual liquid in the spray nozzle and liquid transfer pipe. This prevents liquid retention in the tube and enhances the cleaning effect.

If a direction switching solenoid valve is provided in the liquid delivery pipe on the pump discharge side, the liquid delivery circuit is switched to the nozzle direction when the pump is started, and the liquid delivery circuit is switched to the tank return direction when the pump is stopped. In addition, the change in the liquid pressure in the nozzle at the time of starting and stopping the spray is extremely cut off, and liquid dripping from the nozzle tip can be prevented.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention, and FIG. 1 is a basic circuit diagram of a spraying device. The spraying device of this embodiment is an example installed in a compaction machine (combined roller) having an iron compaction wheel for the front wheel and a compaction wheel composed of a plurality of pneumatic tires for the rear wheel, as shown in FIG. to, the wheels T _R after the compaction machine T, by spraying the liquid from the nozzle 5 is to prevent the rolling asphalt from adhering to the圧輪T _R.

That is, a liquid tank 1 and a pump 2 are mounted on a compaction machine T, and a spring return type three-way switching solenoid valve 1 is provided in the middle of a liquid delivery pipe 4 connected to the pump discharge side.
1 is interposed and near the end of the liquid delivery pipe 4 beyond that,
The same number (4 in the figure) of nozzles 5 for injection as the plurality of compaction wheels T _R are connected. A check valve 9 is integrally attached to each nozzle 5 as described later. Further, at the end of the liquid delivery pipe downstream of the nozzle 5 and in the vicinity of the nozzle 5, the nozzle 5
A flow rate adjusting valve 20 for adjusting the liquid spray amount is attached. The flow rate adjusting valve 20 is a manual three-way switching valve, and operates the lever 20a to communicate the flow path of the liquid sending pipe 4 with the return pipe 16 to the tank 1 at an arbitrary opening degree.
Has a function of adjusting the flow rate of the liquid (including the on / off adjustment of whether or not to flow the liquid), and the flow path of the liquid supply pipe 4 is returned to the return pipe 16 and the drain pipe. It also has the function of freely switching between 17 and.

The liquid in the tank 1 is transferred to the strainer 12
As shown in FIG. 1, a drain drain valve 14, which is a manual three-way switching valve, is provided in the middle of a suction pipe 13 that is sucked into the pump 2 via the. Further, as an operation switch for turning on / off the pump 2 and the three-way switching solenoid valve 11 at the same time, an operation switch 7 for a site worker is arranged near the flow rate adjusting valve 20, and an operation switch for the driver's seat 6 is provided. The spraying device can be operated by any of the above.

3 (a) to 3 (d) show various nozzles Ass'y5 which can be used in the spraying device of the present invention.
It is an example of a. (A) is a type in which the spring type check valve 9 is built in the nozzle 5 and is integrally attached / detached, and (b) is a filter in which the spring type check valve 9 is built in at the rear end of the nozzle 5. It is a type in which 21 is screwed and integrally mounted. The type (c) is a type in which the nozzle 5 is screwed and attached to the tip of the body of the commercially available ready-made in-line check valve 9 and the filter 21 is screwed and attached to the rear end of the check valve, which is attached to the flank of the liquid feeding pipe 4. Pierce the boss 22
It is mounted by screwing into a mounting portion formed by welding.

(D) uses a pipe joint (a cross joint is shown in the figure, but may be a tee or an elbow) for the nozzle body, and has a check valve 9 and a filter 2 at one end thereof.
This is a new type in which the nozzle 5 is attached after internally installing 1 and the like, and it is possible to directly connect and install the liquid delivery pipe 4. Next, the operation of the spraying device will be described.

At the pavement site, the worker can use the rear wheel T of the compacting machine T.
It can be operated near the _R. Now, when the operation switch 7 at the site is turned on, the drive motor (not shown) of the pump 2 and the solenoid valve 11 are energized to start the pump 2, and at the same time, the three-way switching solenoid valve 11 is operated to bring the nozzle 5 into conduction. , Check valve 9 from nozzle 4 to liquid delivery pipe 4
The liquid fills up to the front. Pressure liquid feed pipe 4 spray a liquid against rolling surfaces of the rear wheels T _R from the check valve 9 is pushed open and conducts liquid supply tube 4 nozzle 5 when raised to a predetermined pressure is started. The spray amount is a flow amount that is adjusted in advance (or at the time of the first spray operation) by operating the lever of the flow rate adjusting valve 20, and the excess amount of the liquid pumped from the pump 2 is returned via the flow rate adjusting valve 20. It is returned to the tank 1 via the pipe 16. Of course, even during spraying, the flow rate adjusting valve 20 can be manually operated to freely adjust the spray amount. Since the operator can operate the flow rate adjusting valve 20 while actually observing the spray state from the nozzle 5 from near, it is possible to always maintain an appropriate spray state.

Further, since the flow rate adjusting valve 20 is installed on the downstream side adjacent to the nozzle 5, if the return opening of the valve is adjusted by operating the lever 20a of the flow rate adjusting valve 20, there is almost no time lag. Since the spray amount of 5 changes,
The responsiveness and operability of flow rate adjustment are very good. During spraying, part of the liquid passes through the return pipe 16 and the tank 1
It circulates and flows between the nozzle 5 and the nozzle 5, and the cleaning is effectively performed without staying in the pipe.

On the other hand, when the switch 8 is turned off, the switching valve 11 is switched at the same time when the pump 2 is stopped and the return pipe 1
6 becomes conductive. The liquid in the liquid supply pipe 4 can return to the tank 1 from both the three-way switching solenoid valve 11 and the flow rate adjusting valve 20 through the return pipe 16, so that a pressure pool is formed in the liquid supply pipe 4. In addition, the liquid in the liquid supply pipe 4 is rapidly discharged and the pressure drops sharply. Therefore, the check valve 9 is rapidly returned by the force of the spring to cut off the conduction of the liquid supply pipe 4. In this way, the check valve 9 that opens and closes the liquid conduction of the nozzle 5 instantly opens and closes in response to a rapid pressure change in the liquid supply pipe 4, so that the "slipping" of the liquid from the tip of the nozzle 5 is performed. It is possible to effectively prevent liquid dripping such as "sag". In addition, the deposition phenomenon of solid matter due to the retention of liquid is also prevented.

4 and 5 show another embodiment. In this embodiment, the spraying device of the present invention is applied to a tire roller in which a front wheel T _F and a rear wheel T _R of a compaction machine T are equipped with a plurality of pneumatic tires. The spray circuit for the front wheels T _F and the spray circuit for the rear wheels T _R differ only in the number of nozzles 5 provided according to the number of tires. In order to be able to perform work by arbitrarily selecting the two paths, and in order to divide into an appropriate flow rate according to each spray amount and each flow rate of the two paths,
A manual three-way switching valve 25 is provided on the discharge side of the pump 2,
The spray device is operated by selecting one of the paths by operating the lever 25a. Other configurations, operations, and effects are similar to those of the first embodiment.

The present invention is not limited to the above-described embodiments, but the type of the two-way switching solenoid valve 11 and the type of the flow rate adjusting valve 20 can be arbitrarily selected.

[0027]

As described above, according to the present invention,
Since the flow rate adjusting valve for adjusting the liquid spray amount of the nozzle in the atomizing device of the compacting machine is arranged downstream of the nozzle to adjust the spray amount, the response of the adjustment of the nozzle spray amount becomes good. Play. Also, because the position of the flow rate adjustment valve is near the position of the nozzle attached to the liquid delivery pipe, the operator can make adjustments while visually checking the spray state of the nozzle, and workability is extremely good. Has the effect of becoming.

Further, since a three-way switching valve is used as the flow rate adjusting valve and drainage is performed in one of the three directions, it is possible to eliminate solid matters which are apt to cause clogging of the nozzle from depositing in the liquid feeding pipe for cleaning. Therefore, it is possible to reduce the trouble of cleaning and replacing the nozzle. Also,
Since the direction switching solenoid valve was installed in the liquid delivery pipe to rapidly switch the flow path between the nozzle and the tank return pipe in response to the start / stop of the pump, the change in liquid delivery pressure was accelerated. The check valve is cut off more effectively, and the liquid drop prevention performance before and after spraying is further improved.

By mounting a check valve for opening and closing the spray, a filter for preventing nozzle clogging, etc. between the nozzle and the liquid supply pipe, it is possible to remove the nozzle alone for replacement or cleaning. The effect is that the efficiency of maintenance work is improved.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a spraying device according to a first embodiment of the present invention.

FIG. 2 is a side view of an actual machine arrangement shown by omitting a part of what is shown in FIG.

FIG. 3 Various spray nozzles Ass'y applicable to the present invention
It is the side view which illustrated.

FIG. 4 is a side view of an actual machine arrangement according to a second embodiment of the present invention.

5 is a circuit configuration diagram of the spraying device shown in FIG.

FIG. 6 is an example of a circuit configuration diagram of a conventional spraying device.

FIG. 7 is another example of a circuit configuration diagram of a conventional spraying device.

[Explanation of symbols]

 2 pump 4 liquid supply pipe 5 nozzle 9 check valve 11 directional switching solenoid valve 20 flow control valve 21 filter

Claims (7)

[Claims] 1. A pump for supplying a liquid from a liquid tank, a liquid feed pipe having one end connected to a discharge side of the pump and the other end returned to the liquid tank, and a compaction machine disposed on the liquid feed pipe. And a flow rate adjusting valve for adjusting the flow rate of the liquid in the liquid delivery pipe. A spraying device for a compacting machine. 2. The atomizing device for a compaction machine according to claim 1, wherein the flow rate adjusting valve is arranged downstream of the nozzle. 3. The spraying device for a compaction machine according to claim 1, wherein the position of the flow rate adjusting valve is near the position of the nozzle attached to the liquid feed pipe. 4. A spraying device for a compaction machine according to claim 1, wherein a three-way switching valve is used as the flow rate adjusting valve, and drainage is provided in one of the three directions. 5. A direction switching solenoid valve for switching the flow path between the nozzle and the tank return pipe in response to the start / stop of the pump is provided in the liquid supply pipe. 5. A spraying device for a compaction machine according to any one of 1 to 4. 6. A non-return valve is provided between the nozzle and the liquid feed pipe, the check valve being configured to conduct the liquid in the liquid feed pipe to the spray port of the nozzle when the pressure in the liquid feed pipe rises to a predetermined pressure. The spraying device for a compaction machine according to any one of claims 1 to 5, wherein 7. A check valve and a filter for conducting the liquid in the liquid feed pipe to a spray port of a nozzle when the pressure in the liquid feed pipe rises to a predetermined pressure, and a check valve is provided between the nozzle and the liquid feed pipe. The spraying device for a compaction machine according to any one of claims 1 to 5, wherein the spraying device is attached to the spraying device.