JP3129999B2 - Method and apparatus for removing residual solution in asphalt solution spraying apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asphalt solution spraying apparatus mounted on an asphalt spraying vehicle for paving asphalt on a road surface, and a method for removing a residual solution remaining in pipes and spraying pipes after asphalt is sprayed. And an apparatus for performing the method.

[0002]

2. Description of the Related Art When asphalt solution is sprayed on a road surface by an asphalt solution spraying device mounted on an asphalt solution spraying vehicle and paving is performed, the asphalt solution in an asphalt tank is distributed to a rear end of a vehicle body through a pipe by a pressure pump. The asphalt solution is sprayed on the road surface from a plurality of spray nozzles attached to this spray pipe, and after spraying, the inside of the pipe from the pressure pump to the spray pipe is sprayed. , The asphalt solution remains, so it is necessary to eliminate this residual solution.

For this reason, conventionally, for example, actual fairness 1-1
As described in Japanese Patent No. 1775, by reversing the pressure pump with the spray nozzle open, a method of sucking the residual solution in the pipe and the spray pipe and collecting it in the asphalt tank or a compressor connected to the pipe A method is known in which the remaining solution in the piping and the spray tube is pushed out by the air pressure of the compressor.

[0004]

However, according to the former method, when the pressure pump is reversed, air is sucked from the spray nozzle and the suction force for the residual solution in the pipe is reduced. The residual solution in the pipe and the spray pipe cannot be effectively collected in the asphalt tank. Therefore, there is a problem that the asphalt solution remaining in the pipe or the spray nozzle is cooled and hardened to cause a clogging phenomenon, which adversely affects the next spraying operation. Also,
In the latter method of extruding the compressor by air pressure, a large-capacity compressor and an air tank are required to effectively remove the residual solution in the pipes and the spraying pipes. Not only is it difficult to mount the compressor on an air conditioner, but mounting a compressor and an air tank also poses a problem in terms of cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a solution pumping pipe, a spraying pipe, and a spraying nozzle with a simple structure and operation without using a pumping pump or a compressor. It is an object of the present invention to provide a method for removing a residual solution in an asphalt solution spraying apparatus capable of efficiently and promptly removing an asphalt solution remaining therein, and an apparatus for removing the same.

[0006]

According to a first aspect of the present invention, there is provided an asphalt solution spraying apparatus, comprising: an asphalt solution tank mounted on an asphalt solution spraying vehicle; In an asphalt solution spraying apparatus for supplying and spraying an asphalt solution to a spray pipe provided with a plurality of spray nozzles through a solution pumping pipe by a pressure pump from a solution pump, after spraying, the exhaust of an engine of an asphalt solution spraying car is sent to the solution pumping pipe. And recovering the remaining solution in the solution pressure feeding pipe and the spray pipe by the exhaust pressure into the asphalt solution tank through the return pipe.

According to a second aspect of the present invention, in the method for removing a residual solution in the asphalt solution spraying apparatus according to the first aspect, the residual solution in the solution pressure feeding pipe and the spraying pipe is returned by the exhaust pressure of the engine of the asphalt solution spraying car. After being collected in an asphalt solution tank through a pipe, the exhaust gas of the engine is pumped to a plurality of spray nozzles provided in the spray pipe to discharge the remaining solution in all the spray nozzles to the outside.

According to a third aspect of the present invention, there is provided an apparatus for performing the residual solution discharging method in the asphalt solution spraying apparatus according to the first aspect, wherein a pressure pump is provided to an asphalt solution tank installed on an asphalt solution spraying vehicle. Via a return pipe having a switching valve, and connecting the solution pressure feed pipe to an asphalt solution inflow port of a spray pipe provided with a plurality of spray nozzles and connecting the asphalt solution return port of the spray pipe with the switching valve. In the asphalt solution spraying device connected to the asphalt solution tank,
The exhaust pipe of the engine of the asphalt solution spraying vehicle is connected to and communicated with the solution pressure feed pipe through an exhaust introduction pipe having an open / close valve.

[0009]

[Operation and Effect] With this configuration, when the asphalt solution is sprayed, the pressure pump is driven to allow the asphalt solution in the asphalt solution tank to flow through the solution pipe through the solution pressure pipe, and the return pipe is opened from the switching valve opened. The asphalt solution is sprayed from the spray nozzle to the road surface by closing the switching valve and opening the spray nozzle attached to the spray pipe from the state of reflux and circulation in the asphalt solution tank through the spray nozzle.

Next, when the asphalt solution spraying operation is completed and the inside of the asphalt solution spraying apparatus is to be cleaned by removing the residual solution in the solution pressure feeding pipe and the spraying pipe, first, the spraying wheel and the pressure feeding apparatus are used. Stop the pump and close the spray nozzle and open the switching valve. In this state, the on-off valve of the exhaust introduction pipe connected to and connected to the solution pumping pipe is opened, and the engine of the sprayer is driven to introduce the engine exhaust gas into the solution pumping pipe, thereby increasing the engine speed. Then, the exhaust gas quickly flows from the solution pumping pipe through the dispersion pipe and the return pipe, and the residual solution remaining in the solution pumping pipe, the spray pipe and the return pipe can be collected in the asphalt solution tank.

Further, according to the invention of claim 2, after the residual solution in the solution pressure feeding pipe, the spray pipe and the return pipe is recovered in the asphalt solution tank, the switching valve is closed, and the opening and closing valve of each spray nozzle is opened. The exhaust of the engine is supplied to the solution pumping pipe with the valve open, so that the exhaust is rapidly blown from the solution pumping pipe through the spraying pipe to the outside air from all the spray nozzles, and all the spraying is performed by the exhaust force at that time. The solution remaining in the nozzle can be instantaneously discharged and removed to the outside, and the spray nozzle can be cleaned.

[0012] The displacement of the engine of the spraying vehicle used in the spraying device is extremely large, and the exhaust gas quickly flows through the solution pumping pipe, the spraying pipe and the return pipe in the spraying apparatus and remains in these pipes. The asphalt solution can be quickly and reliably recovered in the asphalt solution tank, and the remaining solution in all the spray nozzles attached to the spray tube can be reliably discharged to the outside by the exhaust pressure.

[0013] Further, the engine of the spraying vehicle is used, and the exhaust from the engine is sent through the same distribution pipe as when asphalt solution is sprayed, that is, through the solution pumping pipe, into the spraying pipe and circulated to discharge the residual solution. Because
With a simple structure in which the exhaust pipe of the engine is connected to the exhaust pipe of the engine to the existing piping system, the residual solution can be reliably discharged, and the operation is easy and the cost is beneficial.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, an asphalt solution spraying vehicle 1 has a truck chassis of a 4 ton class, and an asphalt solution is spread on a vehicle body 1a. Solution tank 2 stored
And a pressure pump 3 for asphalt solution directly connected to a hydraulic motor (not shown). Further, an asphalt solution spray pipe 4 is provided at the rear end of the vehicle body 2. A plurality of spray nozzles 5, 5,... 5 are attached to the solution spray tube 4 at small intervals in the length direction.
By opening and closing the on-off valve 6 attached to each spray nozzle 5, the spray nozzle 5 is connected to the spray pipe 4 to spray the asphalt solution.

FIG. 2 shows an asphalt solution piping system between the solution tank 2 and the spraying pipe 4, wherein the solution tank 2 and the suction port of the pressure pump 3 are connected by a solution supply pipe 7 and pressure-fed. An asphalt solution pressure feed pipe 8 is connected between the discharge port of the pump 3 and the asphalt solution inlets 4a, 4a of the spray pipe 4 in a communicating state, and is further connected between the asphalt solution return port 4b of the spray pipe 4 and the solution tank 2. Is connected to a solution return pipe 9 in a communicating state.

In this piping system, a strainer 10 is interposed in the solution supply pipe 7, and the solution supply pipe 7 between the strainer 10 and the pressure pump 3 and the solution near the discharge port of the pressure pump 3 are connected. A bypass pipe 12 having a relief valve 11 is connected between the pressure feeding pipes 8, and the asphalt solution fed through the pressure feeding pipe 8 is sprayed on the pipe section of the solution return pipe 9 on the side of the spray pipe 4. And a circulation valve 13 for switching between the circulation mode and the circulation mode. Although only one solution spray tube 4 is shown in the figure, usually, two solution spray tubes 4 are paved by extending and contracting in mutually opposing length directions. It is configured to correspond to the required road width.

The on-off valve 6 mounted on each of the spray nozzles 5 is normally closed by the force of a spring (not shown) provided therein, and is connected through a pipe 15 from a compressor 14 installed on the vehicle body 1a. By supplying compressed air into each of the on-off valves 6, the valve body is pushed up and opened against the spring force. The switching valve 13 is opened and closed by operating its on-off cock 13a by a hydraulic cylinder 16, and the hydraulic cylinder 16 and the compressor 14 are configured to be operated by operation from a driver's seat. .

While the piping system for the asphalt solution is constructed as described above, the driving engine 17 of the asphalt solution spraying vehicle 1 has a muffler 19 and a switching damper 20 arranged in the exhaust pipe 18 in this order to perform the switching. The exhaust pipe is configured to be exhausted to the outside (outside air) via the damper 20, and an exhaust introduction pipe is provided between the switching damper 20 and the muffler 19.
One end of 21 is connected in a branched state, and this exhaust introduction pipe 21
The other end is connected to the discharge port of the asphalt solution pressure pump 3, and is connected to the base end of the solution pressure pipe 8, that is, the pipe on the discharge port side of the pressure pump 3. An on-off valve 22 composed of a stop valve is provided in the exhaust introduction pipe 21.
Are arranged.

In order to spray the asphalt solution on the road surface by the asphalt solution spraying device configured as described above,
First, an exhaust introduction pipe 21 branched from an exhaust pipe 18 of an engine 17 is closed by an on-off valve 22 so that the exhaust of the engine 17 is discharged to the outside through a switching damper 20 and attached to the spray pipe 4. The asphalt solution in the solution tank 2 is supplied to the supply pipe 7 and the pressure pump 3 by driving the pressure pump 3 with the on-off valve 6 of each spray nozzle 5 closed and the switching valve 13 of the return pipe 9 opened. , The pressure feed pipe 8, the spray pipe 4, the return pipe 9, and the solution tank 2 are sequentially circulated.

In this state, the spraying width of the spraying pipe 4 is set in accordance with the path width, and compressed air is supplied from the compressor 14 to the on-off valve 6 of the spraying nozzle 5 to open the on-off valve 6 and to open the hydraulic cylinder 16 When the switching valve 13 is closed, the asphalt solution in the solution tank 2 sucked through the supply pipe 7 by the pressure pump 3 is sent out to the solution pressure pipe 8 as shown by an arrow in FIG. It is introduced into the spray pipe 4 and sprayed from the spray nozzle 5 onto the road surface. The switching valve 13 and the opening / closing valve 6 of the spray nozzle 5 are configured to work together. When the switching valve 13 is closed, the opening / closing valve 6 of the spray nozzle 5 is opened, and when the switching valve 13 is opened, the spraying is performed. The on-off valve 6 of the nozzle 5 is closed.

When the spraying operation is interrupted, the hydraulic cylinder
The switching valve 13 is opened by 16 and the supply of the compressed air from the compressor 14 is stopped in conjunction with the switching valve 13, so that the communication of all the spray nozzles 5 to the spray pipe 4 is cut off. In this state, the asphalt solution pumped into the spraying pipe 4 from the solution tank 2 side by the pressure feed pump 3 through the supply pipe 7 and the solution pressure feed pipe 8 is circulated again into the solution tank 2 through the return pipe 9. In addition,
The solution tank 2 is provided with a heating device to keep the asphalt solution inside at a constant temperature.

Next, when the spraying operation is completed, the inside of the asphalt solution is discharged by discharging the asphalt solution remaining in the asphalt solution pressure feeding pipe 8 and the spraying tube 4 and the spraying nozzle 5 to the outside. In order to perform the cleaning in the pipe, first, the spraying wheel 1 and the solution pump 3 are stopped, and the on-off valves 6 of all the spray nozzles 5 mounted on the spraying pipe 4 are closed. Release 13. In this state, an exhaust introduction pipe connected to and connected to the solution pressure supply pipe 9
By opening the on-off valve 22 of 21 and closing the switching damper 20 in the exhaust pipe 18 to drive the engine 17 of the spraying vehicle 1 so as not to exhaust the exhaust to the outside, the exhaust from the engine 17 passes through the exhaust introduction pipe 21. It is introduced into the solution pressure feed pipe 7. When the rotation speed of the engine 17 is increased, as shown by arrows in FIG. 3, the exhaust gas rapidly flows from the solution pressure feeding pipe 8 through the spraying pipe 4 and the return pipe 9, and these pipes 4, 8 , 9 are collected in the asphalt solution tank 2.

After the residual solution in the solution pressure feed pipe 8 and the spray pipe 4 and the return pipe 9 is recovered in the asphalt solution tank 2 in this manner, the open / close valves 6 of all the spray nozzles 5 are subsequently recovered.
And the switching valve 13 is closed in conjunction with the opening, and the exhaust from the engine 17 is discharged from all the spray nozzles 5 through the solution pressure feed pipe 8 through the spray pipe 4 as shown by arrows in FIG. By discharging the asphalt solution remaining in all the spray nozzles 5 to the outside by the exhausting force by ejecting the spray to the outside (outside air), the inside of the spray nozzle 5 is cleaned.

As described above, the solution pressure feed pipe 8 and the spray pipe 4
Then, the inside of the return pipe 9 and the inside of the spray nozzle 5 are cleaned by removing the residual solution, so that the next spraying operation can be performed smoothly. Normally, the truck chassis used for the spreader 1 is of the 4-ton class, as described above, so the engine 17 has a displacement of at least about 6000 cc, and the displacement at 2000 rpm is 12000 liters per minute. And the exhaust amount is comparable to that of a very large compressor, so that the exhaust gas has a large capacity and a large pressure, and rapidly flows from the solution pressure feeding pipe 8 and the spray pipe 4 to the return pipe 9. Circulates, these solution pressure feeding pipe 8, spraying pipe 4, return pipe 9
The residual solution in the spray nozzle 5 can be quickly and reliably recovered in the solution tank 2, and the exhaust solution is blown out from all the spray nozzles 5 to eject and remove the residual solution in the spray nozzles 5 to the outside. Also, the inside of the spray nozzle 5 can be reliably washed.

[Brief description of the drawings]

FIG. 1 is a simplified side view of a spreading vehicle,

FIG. 2 is a piping diagram of a solution spraying apparatus,

FIG. 3 is a discharge route diagram of a residual solution showing a residual solution discharge state in a pipe;

FIG. 4 is a discharge route diagram of the residual solution showing a state of discharging the residual solution in the spray nozzle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Asphalt solution spraying vehicle 2 Solution tank 3 Pressure pump 4 Spraying pipe 5 Spray nozzle 6 On / off valve 8 Solution pressure feeding piping 13 Switching valve 17 Engine 18 Exhaust pipe 20 Switching damper 21 Exhaust introduction pipe 22

Claims (3)

(57) [Claims] 1. An asphalt solution spraying device for supplying and spraying an asphalt solution from an asphalt solution tank mounted on an asphalt solution spraying vehicle to a spraying tube having a plurality of spraying nozzles through a solution pumping pipe by a pressure pump, after spraying, An asphalt solution spraying device, wherein exhaust gas from an engine of an asphalt solution spraying vehicle is sent to the solution pressure feeding pipe, and the residual pressure in the solution pressure feeding pipe and the spraying pipe is collected in the asphalt solution tank through a return pipe by the exhaust pressure. Method for removing residual solution in 2. The asphalt solution spraying vehicle collects the residual solution in the solution pumping pipe and the spraying pipe into the asphalt solution tank through the return pipe by the exhaust pressure of the engine of the asphalt solution spraying car, and then applies the engine to a plurality of spraying nozzles provided in the spraying pipe. 2. The method for removing a residual solution in an asphalt solution spraying apparatus according to claim 1, wherein the residual solution in all the spray nozzles is discharged to the outside by pumping the exhaust gas. 3. An asphalt solution tank connected to an asphalt solution spraying vehicle is connected to a solution pressure feeding pipe via a pressure pump, and the solution pressure feeding pipe is connected to an asphalt solution inlet of a spray pipe having a plurality of spray nozzles. In addition, in the asphalt solution spraying apparatus having the asphalt solution return port of the spraying pipe connected to the asphalt solution tank through a return pipe having a switching valve, the exhaust pipe of the engine of the asphalt solution spraying car is provided with an on-off valve. A residual solution removing device in an asphalt solution spraying device, which is connected to and communicates with said solution pressure-feeding pipe through a pipe.