JP2006193888A - Spray nozzle-cleaning device for asphalt solution-spraying equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly perform the next spraying operation by eliminating a residual asphalt solution in a spray nozzle during the interruption of the operation, in the case of asphalt solution spraying equipment which is constituted to spray an asphalt solution onto a road surface from a plurality of spray nozzles mounted on a spray pipe arranged at a back end, while a spray vehicle is traveled. <P>SOLUTION: In this spray nozzle cleaning device, the spray nozzle 7 is mounted on the spray pipe 5 via an opening/closing cock 6, and the inside of the base end of each spray nozzle 7 communicates with an air tank 3 via an air supply pipe 10 which is provided with a solenoid valve 12. In the interruption of the spraying operation, high-pressure air is pressure-fed into each spray nozzle 7 by closing the opening/closing cock 6 and opening the solenoid valve 12, and the asphalt solution remaining in the nozzle is eliminated by being jetted onto the road surface from a leading-end opening. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to an apparatus for cleaning an asphalt solution spray nozzle when an asphalt solution spray is interrupted in an asphalt solution spray apparatus that is mounted on an asphalt solution spray vehicle and performs paving by spraying an asphalt asphalt solution on a road surface. .

  Conventionally, an asphalt solution spraying device mounted on an asphalt solution spraying vehicle is a method of compressing an asphalt solution in a solution tank installed on the spraying vehicle by a pump or by pressurizing the solution tank with high-pressure air from a compressor. The pipe is supplied to a spray pipe arranged in the width direction of the car body at the lower rear end of the car body through the pipe, and the open / close cock attached to the sprinkler pipe at regular intervals in the length direction is opened. The asphalt solution is sprayed on the road surface from a plurality of spray nozzles connected and communicated with each other in the spray pipe. For the purpose of spraying a certain amount of asphalt solution at a predetermined spray angle, the spray nozzle is formed in a small-diameter orifice, so that clogging due to foreign matter or in the spray nozzle after spraying Clogging due to consolidation of the remaining asphalt solution is likely to occur.

  As a countermeasure against such clogging of the spray nozzle, for example, as described in Patent Document 1, a plurality of spray nozzles are provided through a solution pumping pipe by a pump from a solution tank mounted on an asphalt solution sprayer. In an asphalt solution spraying device that supplies and sprays an asphalt solution to the spray pipe, after spraying, the exhaust of the engine of the spray truck is introduced into the solution pumping pipe, and the residual solution in the solution pumping pipe and the spray pipe is removed by the exhaust pressure. The solution is collected in the solution tank through a return pipe, and then the exhaust solution is pumped through all the spray nozzles through the solution pressure feed pipe to discharge the residual solution in the spray nozzle to the outside.

Further, as a device for dissolving only the asphalt solution solidified in the spray nozzle irrespective of the asphalt solution remaining in the solution pressure feeding pipe or the spray tube, for example, as described in Patent Document 2, the spray tube While providing a block portion having a vertical flat surface to all the spray nozzles mounted on, a single strip heater is mounted in contact with the vertical flat surface of all the spray nozzles, An apparatus is known in which a spray nozzle is heated by this heater to dissolve an asphalt solution solidified in the nozzle.
Japanese Patent Laid-Open No. 11-50413 JP 2000-38708 A

  However, according to the former asphalt solution spraying device, before removing the remaining asphalt solution in the spray nozzle, the asphalt in the return pipe and the solution pressure pipe connected and communicated between the solution tank and the spray pipe The solution must be collected in the tank, and the residual asphalt solution is discharged into the spray nozzle by the exhaust pressure through the solution pressure feed pipe and spray tube. After the pavement work is completed, it is very effective to clean such pipes and spray nozzles after pavement work, but during paving work performed intermittently, It is extremely inefficient to employ cleaning work in such pipes, spray pipes and spray nozzles when the work is interrupted. Can not. The same problem as described above also arises in a spraying device configured to pressurize the inside of the solution tank with high-pressure air from a compressor and pump the asphalt solution in the tank to the spraying tube side through the pumping piping.

  On the other hand, according to the latter device, the asphalt solution in the pipes and spray pipes is left as it is when paving work is interrupted, and only the residual asphalt in the small-diameter spray nozzle that tends to solidify during the suspension is heated. Since it dissolves, it can be moved to the next spraying operation immediately after the work is interrupted. However, attaching a heating means such as a heater not only makes the whole apparatus complicated and expensive. It takes a relatively long time to energize the heater and raise the inside of the spray nozzle to a predetermined temperature by the heat, and in order to efficiently transmit the heat generated from the heater to the spray nozzle, There is a problem that it is necessary to provide a block portion having a vertical flat surface as described above for increasing the contact area.

  The present invention has been made in view of such problems, and the object of the present invention is to disperse by simply and quickly removing only the asphalt solution in the spray nozzle during paving work interruption with a simple structure. An object of the present invention is to provide a spray nozzle cleaning device in an asphalt solution spraying device capable of reliably cleaning only the nozzle.

  In order to achieve the above object, the spray nozzle cleaning device in the asphalt solution spraying device according to the present invention includes a plurality of spray nozzles at a small interval in the longitudinal direction at the lower end of the rear end of the asphalt solution spraying vehicle. In an asphalt solution spraying device configured to disperse a spray pipe equipped with a spray nozzle and to supply and spray the asphalt solution from the solution tank mounted on the asphalt solution spray vehicle to each spray nozzle from the above spray pipe through the pipe, Each spray nozzle is communicated with an air tank through an air supply pipe and a valve, and the valve is opened so that the asphalt solution in all the spray nozzles is discharged to the outside by high-pressure air.

  In the spray nozzle cleaning device in the asphalt solution spray device configured as described above, the invention according to claim 2 is that the spray nozzles communicate with the spray pipe via the spray opening / closing cock and the base end portion of each spray nozzle. And an air supply pipe is connected to the air inlet through a check valve.

  Furthermore, the invention according to claim 3 is such that all the air supply pipes connected to the plurality of spray nozzles are connected to and communicated with a single collecting pipe, and the collecting pipe is provided with an air tank provided with a valve. It is connected through a tube.

  According to the spray nozzle cleaning device in the asphalt solution spray device according to claim 1, since the plurality of spray nozzles attached to the spray tube are connected to the air tank via the air supply tube and the valve, the spray nozzle When paving work is interrupted by spraying asphalt solution from the tank, by opening the valve, high-pressure air in the air tank is supplied to all spray nozzles, and the asphalt solution in the spray nozzles is instantaneously and reliably discharged to the outside. In this cleaning operation, the asphalt solution supply pipe extending from the solution tank to the spray pipe and the asphalt solution remain in the spray pipe without causing the high-pressure air to act. Therefore, the next pavement operation can be continued immediately after cleaning the spray nozzle.

  In addition, as described above, the high-pressure air in the air tank is supplied only to the spray nozzle and only a small amount of asphalt solution remaining in the nozzle is discharged, so that the discharge work is performed at the end of the spray work. However, there is no risk of any problems occurring, and since the asphalt solution removal work from the spray nozzle can be performed in the spray area, there is no environmental problem, and a slight amount The spray nozzle can be cleaned simply by using high-pressure air, so not only can the spray nozzles be cleaned every time paving work is interrupted, but the nozzle cleaning work is greatly increased. The problem of caking of the asphalt solution in the spray nozzle that occurs within the spray standby time can be reliably solved.

  Furthermore, the spray nozzle cleaning device may be configured by connecting the air source and each spray nozzle by an air supply pipe using an air source such as an air tank that is normally installed in an asphalt solution spray vehicle. As a result, the structure is simple, and it can be implemented economically with only air supply piping costs. As a spray nozzle cleaning device attached to an existing asphalt solution sprayer without replacing the spray nozzle. Can be adopted.

  According to the second aspect of the present invention, each spray nozzle is communicated with the spray pipe through the opening / closing cock, and an air inlet is provided at the base end of each spray nozzle, and the air inlet is non-returned. Since the air supply pipe is connected via a valve, when the asphalt solution is supplied into the spray nozzle by spraying the open / close cock, it is reversed that the asphalt solution enters the air supply pipe. The stop valve can be surely blocked, and when cleaning the spray nozzle after spraying work, the open / close cock is closed while the valve in the air supply pipe is opened, so that the high-pressure air in the air tank is removed. Asphalt attached to the inner wall of the spray nozzle can be removed easily and reliably by supplying concentrated to only all the spray nozzles and remaining in the spray nozzle. It can be washed clean by eliminating up to the minute.

  According to the invention of claim 3, all the air supply pipes connected to the plurality of spray nozzles are connected to and communicated with one collecting pipe, and the collecting pipe is connected to the air tank with an air introduction valve. Since it is connected via a pipe, the high pressure air in the air tank is pumped to the collecting pipe by opening the valve, and the high pressure air is evenly distributed to all the air supply pipes through this polymerization pipe. The nozzle can be smoothly cleaned by supplying high-pressure air of a predetermined pressure all at once into the spray nozzle communicating with the pipe.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes an asphalt solution spray vehicle body, and an asphalt solution tank 2 (hereinafter, referred to as an asphalt solution tank 2) on the vehicle body of the spray vehicle body 1. An asphalt solution spraying pipe 5 (hereinafter simply referred to as a spraying pipe) comprising a rectangular tube long in the road width direction at the lower rear end of the spraying vehicle main body 1 is installed and installed. 2 and 3, and a spray nozzle 7 is attached to the spray pipe 5 through an opening / closing cock 6 at small intervals in the length direction as shown in FIGS. 2 and 3.

  These spray nozzles 7 are attached in a state in which the solution injection opening end 7a at the tip formed in the small-diameter orifice is directed downward and the base end (upper end) side is communicated with the discharge side of the opening / closing cock 6. At the same time, an air introduction port 7b is opened at the base end portion of each spray nozzle 7, that is, the peripheral wall portion in the vicinity of the discharge side of the opening / closing cock 6, and the air introduction port 7b is connected to the air introduction port 7b via a nipple 8 as shown in FIG. As shown in FIG. 2, a check valve 9 is attached, and an air supply pipe 10 made of a flexible tube is connected to each spray nozzle 7 through the check valve 9 to pass through the air supply pipe 10. The check valve 9 is opened by the pressure of the high-pressure air so that the high-pressure air can be introduced into the air introduction port 7b.

  Further, all the air supply pipes 10 are connected to and communicated with a single collecting pipe 11 arranged at an appropriate position of the spray vehicle main body 1, and this collecting pipe 11 is provided with a solenoid valve 12 and an air regulator 13. It is connected to and communicated with the air tank 3 through a pipe 14. High pressure air (compressed air) is supplied into the air tank 3 from the compressor 4 driven by the vehicle engine. As shown in FIG. 4, the open / close cock 6 is attached to the front tube wall of the spray tube 5 via a nipple 15 and communicates with the spray tube 5.

  As shown in FIGS. 2 and 3, the opening / closing cock 6 is composed of several pairs, and the tip of the cock rotating lever 6 a of each pair of opening / closing cocks 6 is rotatably connected by a single connecting bar 16. At the same time, each connecting bar 16 is connected to a fluid pressure cylinder 17 disposed on the spray pipe 5 and connected to a piston rod 17a, and the piston rod 17a is expanded and contracted to rotate the cock rotating lever 6a. It is configured to open and close all at once. Note that the spray pipe 5 is configured to have a length that can be extended to the width of the vehicle body or more by addition or the like.

  The spray nozzle cleaning device configured as described above is attached to a known asphalt solution spray device, and the asphalt solution spray device sprays the asphalt solution on the road surface while slowly moving the spray vehicle body 1 to paved the road surface. After that, before paving work is interrupted and the next paving work is performed, the cleaning device is operated, and the asphalt solution remaining in all spray nozzles 7 is sprayed and discharged on the road surface to clean the spray nozzles 7. To do. As described above, the spray nozzle 7 has a small-diameter orifice at the solution injection opening, and is likely to be clogged with foreign matter or asphalt solution consolidated, and is particularly useful for the next spraying work during spraying work in winter. Consolidates in a short time during standby. Before this consolidation occurs, the asphalt solution remaining in the spray nozzle 7 is ejected and removed by high-pressure air.

  Specifically, the open / close cocks 6 of all the spray nozzles 7 corresponding to the road surface width to be paved are closed by the fluid pressure cylinder 17 when the operation is interrupted. Even in this state, the heated asphalt solution is refluxed through the conduit with the solution tank 2 in the spray pipe 5, and the communication to the spray nozzle 7 side is blocked by closing the open / close cock 6. After the opening / closing cock 6 is closed, if the solenoid valve 12 is opened by moving the spray vehicle main body 1 into the spraying area and operating a solenoid valve opening / closing button switch (not shown) in the driver's seat, High-pressure air is pumped into the collecting pipe 11 through the air introducing pipe 14 and flows into the air introducing ports 7b of all the spray nozzles 7 from the collecting pipe 11 through the air supply pipes 10 while pushing the check valves 9 open. The asphalt solution remaining in the spray nozzle 7 is circulated through the nozzle, and is pushed out by the high-pressure air to be instantaneously injected and discharged from the solution injection opening end 7a onto the road surface.

  In this case, since the spray nozzle 7 has a very small diameter and only a small amount of asphalt solution remains in the inside thereof, the amount of high-pressure air used is also small and can be repeatedly cleaned. In addition, there is no problem even if it is discharged at the end of the spraying operation, and there is no environmental problem because it is discharged to the road surface in the spraying area. The asphalt residual liquid in the spray nozzle 7 is instantaneously discharged by the supply of high-pressure air, and after discharge, the solenoid valve 12 is closed to prepare for the next spraying operation.

  The solenoid valve 12 and the opening / closing cock 6 may be electrically connected to be interlocked so that the solenoid valve 12 is opened at the same time as the spray cock 6 is closed. Further, instead of the solenoid valve 12, an appropriate manual valve is adopted, and the operator operates the manual valve to supply and stop supplying high-pressure air from the air tank 3 to the spray nozzle 7. It may be left. Thus, the asphalt solution remaining in the spray nozzle 7 is discharged by high-pressure air before the asphalt solution is consolidated, and then the asphalt solution is sprayed onto the road surface of the next spray area.

  As an example of the asphalt solution spraying device, a device as described in Patent Document 1 can be adopted. Briefly explaining the structure of this asphalt solution spraying device, as shown in FIG. 6, the solution tank 2 is connected to the solution inlet 5 a of the spraying tube 5 through a solution supply pipe 19 provided with a solution pump 18. In addition to being connected in communication, the solution return port 5b of the spray tube 5 is connected to the solution tank 2 through the solution return tube 20 in communication.

  In this piping system, a strainer 21 is interposed on the inlet side of the solution pump 18 in the solution supply pipe 19, and a bypass pipe having a relief valve 22 between the inlet and outlet of the solution pump 18 Further, a switching valve 24 is provided in the return pipe 20 for switching the asphalt solution pumped through the solution supply pipe 19 between spraying and circulation.

  On the other hand, the driving engine 25 of the sprinkler vehicle body 1 is configured such that a muffler 26 and a switching damper 27 are sequentially disposed in the exhaust pipe 30 and exhausted to the outside through the switching damper 27. One end of an exhaust introduction pipe 28 is connected to the exhaust pipe portion between the switching damper 27 and the muffler 26 in a branched state, and the other end of the exhaust introduction pipe 28 is connected to the solution pump 18 in the solution supply pipe 19. Connected to the discharge port side. An open / close valve 29 comprising a stop valve is disposed in the exhaust introduction pipe 28.

  In order to spray the asphalt solution on the road surface by the asphalt solution spraying device configured as described above, first, the exhaust pipe 28 is closed by the on-off valve 29, and the exhaust of the engine 25 is discharged to the outside through the switching damper 27. In addition, the opening and closing cocks 6 of all the spray nozzles 7 are closed and the switching valve 24 of the return pipe 20 is opened, and the pressure pump 18 is driven to supply the asphalt solution in the solution tank 2 to the supply pipe 19. Through the spray pipe 5, the return pipe 20, and the solution tank 2 in order.

  When the open / close cock 6 is opened in this state and the switching valve 24 is closed, the asphalt solution pumped from the solution tank 2 side by the pumping pump 18 is introduced into the spraying pipe 5 through the supply pipe 19 and passed from the spraying nozzle 7 to the road surface. Sprayed on. At this time, a check valve 9 is provided on the side of the air supply pipe 10 connected to and communicated with the base end of the spray nozzle 7, so that the asphalt solution flows into the air supply pipe 10 from the spray nozzle 7. This check valve 9 can prevent this. When the operation of spraying the asphalt solution on the road surface is interrupted, the switching valve 24 is opened and the open / close cock 6 is closed, and the asphalt solution is supplied into the solution tank 2 through the supply pipe 19, the spray pipe 5 and the return pipe 20 as described above. To prepare for the next spraying operation. In addition, the solution tank 2 is provided with a heating device, and keeps the internal asphalt solution at a constant temperature.

  In addition, after the spraying operation for all the spraying areas is completed, the solution pressure pump 18 is stopped in order to collect the asphalt solution remaining in the solution supply pipe 19, the spraying pipe 5, and the return pipe 20 in the solution tank 2. At the same time, the open / close cocks 6 of all the spray nozzles 7 mounted on the spray pipe 5 are closed, and the switching valve 24 is opened in conjunction with the closing. When the engine 25 is driven after opening the on-off valve 29 of the exhaust introduction pipe 28 in this state and closing the switching damper 27, the exhaust is introduced into the solution supply pipe 19 through the exhaust introduction pipe 28. The asphalt residual liquid in these pipes 5, 19, 20 can be made to flow into the solution tank 2 and collected through the spray pipe 5 and the return pipe 20.

  The asphalt solution spraying device shown in FIG. 6 is configured to send the asphalt solution in the solution tank 2 from the solution supply pipe 19 to the spray pipe 5 side by the solution pressure pump 18. Without pressurization, that is, high pressure air is pumped into the solution tank 2 by the compressor to pressurize the solution tank 2, and the asphalt solution is supplied from the solution tank 2 to the solution supply pipe 19 side by the applied pressure. You may employ | adopt the asphalt solution spraying apparatus comprised so that it might send out.

The simplified side view of an asphalt solution dispersion vehicle. The piping system diagram of a spray nozzle cleaning device. The front view of the spray pipe equipped with the spray nozzle. The side view of the spray nozzle attached to the spray pipe. The front view. The piping system figure of a solution spraying apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sprinkler wheel body 2 Solution tank 3 Air tank 4 Compressor 5 Spray pipe 6 Opening / closing cock 7 Spray nozzle 9 Check valve
11 Collecting pipe
12 Solenoid valve
14 Air inlet pipe

Claims (3)

  Dispersion pipes equipped with multiple spray nozzles at small intervals along the length of the rear end of the asphalt solution sprayer are installed, and the asphalt solution from the solution tank mounted on the asphalt solution sprayer is sprinkled through the pipe. In the asphalt solution spraying device configured to supply and spray to each spray nozzle from within the pipe, each spray nozzle is connected to an air tank via an air supply pipe and a valve, and all the spray nozzles are opened by opening the valve. A spray nozzle cleaning device in an asphalt solution spraying device, wherein the asphalt solution is discharged to the outside by high-pressure air.   Each spray nozzle communicates with the spray pipe through an open / close cock, and an air inlet is provided at the base end of each spray nozzle, and an air supply pipe is connected to the air inlet through a check valve. The spray nozzle cleaning device in the asphalt solution spraying device according to claim 1.   All air supply pipes connected to a plurality of spray nozzles are connected to and communicated with a single collecting pipe, and this collecting pipe is connected to an air tank via an air introduction pipe equipped with a valve. A spray nozzle cleaning device in the asphalt solution spraying device according to claim 1 or 2.

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