JP2004003199A - Emulsion spray device for asphalt finisher equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately spray an asphalt emulsion by selecting spray nozzles to match the width over which the emulsion is sprayed, and to selectively and efficiently wash the spray nozzles needed. <P>SOLUTION: An asphalt finisher equipped with an emulsion spray device has an emulsion spray mechanism 15 with a plurality of spray nozzles 19 attached to a spray bar 18. Each of the spray nozzles 19 includes an emulsion valve 21 for opening or closing a flow passage through which the asphalt emulsion fed from an emulsion tank 13 to the spray bar 18 is supplied into the spray nozzles 19, and a washing solenoid selector valve (washing valve) 27 for opening or closing another flow passage through which cleaning air is supplied from a compressor (source of compressed air) 16 into the spray nozzles 19. The plurality of emulsion valves 21 are individually operated for opening or closing by means of air supplied to an air cylinder via a solenoid selector valve 25 for the emulsion, which valve is selected using an emulsion switch 26. Of the plurality of washing solenoid selector valves 27, those selected using a washing selector switch 28 are individually operated for opening or closing. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emulsion dispersing device in an asphalt finisher provided with an emulsion dispersing device for dispersing an asphalt emulsion on a lower road where an asphalt mixture is spread.
[0002]
[Prior art]
Conventionally, as an asphalt finisher equipped with an emulsion spraying device, a plurality of spraying nozzles are provided at intervals on a spray bar arranged in the width direction of a traveling vehicle, and the spray bar is mounted on an emulsion tank mounted on the traveling vehicle. The asphalt emulsion supplied to the, by the spray nozzle, while spraying on an unpaved roadbed or asphalt pavement, or a lower road surface such as a concrete pavement, while sending out the asphalt mixture put into the hopper, In order to prevent the asphalt emulsion from sticking in the spraying nozzle and causing the spraying nozzle to be clogged, the spouting nozzle is sent out onto the sprayed asphalt emulsion and spread by a screed. A device that supplies cleaning air is known (see Japanese Patent Application Laid-Open No. H11-256511).
[0003]
[Problems to be solved by the invention]
However, in the asphalt finisher provided with the emulsion spraying device, each spraying nozzle opens and closes an emulsion valve that opens and closes a flow path for supplying asphalt emulsion from the spray bar into the spraying nozzle by air pressure at the same time. Since the spraying method for all the spray nozzles that sprays the emulsion onto the lower road surface is used, when the spray width of the asphalt emulsion on the lower road surface changes, the asphalt emulsion is selectively sprayed from the required spray nozzles according to the spray width. I couldn't. For this reason, an excess emulsion collecting means for receiving the asphalt emulsion sprayed from the spray nozzle which does not need to be sprayed with respect to the spray width to the tray and returning it to the emulsion tank is required.
Further, in the circuit for supplying the cleaning air from the compressed air supply source to each of the spray nozzles, an open / close valve is provided on the upstream side, and when the open / close valve is opened, the wash air is supplied to all the spray nozzles at once. The cleaning air is supplied to the spray nozzles that do not need to be cleaned, and only the clogged spray nozzles that need to be cleaned are selectively concentrated to send the cleaning air. There was dissatisfaction that washing of can not be performed.
[0004]
The present invention has been made in view of the above circumstances, and it is possible to appropriately spray an asphalt emulsion by selecting a spray nozzle corresponding to a spray width, and selectively and efficiently wash necessary spray nozzles. It is an object of the present invention to provide an emulsion dispersing device in an asphalt finisher equipped with an emulsion dispersing device.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a spray bar arranged in a width direction of a traveling vehicle with a plurality of spray nozzles at intervals, and the spray bar is mounted on an emulsion tank mounted on the traveling vehicle. The asphalt emulsion supplied to the asphalt finisher equipped with an emulsion spraying device for spraying the asphalt emulsion on the lower road surface where the asphalt mixture is spread, by the spraying nozzles. An emulsion valve for individually opening and closing a flow path for supplying asphalt emulsion to the asphalt emulsion; and a cleaning valve for individually opening and closing a flow path for supplying cleaning air into the spray nozzle from a compressed air supply source mounted on the traveling vehicle. It is characterized by being provided.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an emulsion spraying device of an asphalt finisher with an emulsion spraying device according to an embodiment of the present invention will be described with reference to the drawings.
1 and 2, reference numeral 1 denotes an asphalt finisher with an emulsion spraying device. The asphalt finisher 1 with an emulsion spraying device has a vehicle body 2 supported by front wheels (steering wheels) 2a and rear wheels (drive wheels) 2b, and runs with the power of an engine in a power unit 3 mounted on the vehicle body 2. A self-propelled vehicle (running vehicle) 4, a hopper 5 provided at the front of the vehicle 4 for storing asphalt mixture, and a rear portion of the vehicle 4 in the width direction of the vehicle 2 (in FIG. A spreading screw (delivery device) 6 supported in a vertical direction (vertical direction in FIG. 2) and a front-rear direction (see FIG. 2) of the vehicle body 2 between the bottom of the hopper 5 and the spreading screw 6. 1, a bar feeder (sending device) 7 provided along the left and right direction (in FIG. 2), a front end rotatably supported on both sides of a center of the vehicle 4 in the front and rear direction, and a rear end on a cylinder 8a. Up and down on the body 2 A leveling arm 8 that is supported so as to be movable, a screed 9 that is supported at the rear end of the leveling arm 8 and that can be rotated up and down by a cylinder 8a, and that is extendable and contractible in the width direction of the vehicle 4; And a driver's seat 12 having a control device 11. This configuration is basically the same as the configuration of an asphalt finisher provided with a conventional emulsion spraying device.
[0007]
The emulsion spraying device 10 is provided at an upper portion of the emulsion tank 13 in the center of the vehicle body 2 in the front-rear direction and at a lower portion of one side of the center of the vehicle body 2 in the front-rear direction. An emulsion pump 14 that sucks in through an emulsion pipe n (see FIGS. 3 and 4); and an emulsion pump 14 that is supported by the vehicle body 2 behind the rear wheel 2b and in front of the spreading screw 6 from the emulsion pump 14. An emulsion dispersing mechanism 15 for dispersing asphalt emulsion supplied through an emulsion pipe n (see FIGS. 3 and 4) to a lower road surface; and an emulsion dispersing mechanism 15 installed on the other side of the center of the vehicle body 2 in the front-rear direction. (Compressed air supply source) 16 for supplying washing air (compressed air) to the apparatus, and a control device for controlling the supply of asphalt emulsion and washing air to the emulsion spraying mechanism 15 7 and a (see FIG. 3).
[0008]
As shown in FIGS. 3 and 4, the emulsion spraying mechanism 15 includes a rectangular cylindrical spray bar 18 extending along the width direction of the vehicle 4 and a longitudinal direction of the spray bar 18 (the width direction of the vehicle 4). ), A plurality of spray nozzles 19 attached to the lower part of the spray bar 18 at predetermined intervals, and an emulsion valve 21 for opening and closing a flow path 20 for supplying asphalt emulsion from the spray bar 18 to the spray nozzle 19. I have.
The spraying nozzle 19 has a nozzle 23 attached to a lower end of a nozzle body 22, and is fixed to the spray bar 18 by vertically penetrating the nozzle 23, and communicates with the inside of the spray bar 18 through a through hole 24 a. The nozzle body 22 is connected to a lower end of the nozzle body 24.
[0009]
An air pipe a from the emulsion pump 14 is connected to a side portion of the nozzle main body 22 so as to communicate with an inside 22 a of the nozzle main body 22. The emulsion valve 21 includes a conical valve body 21b below a valve shaft 21a inserted into the support cylinder 24, and the valve shaft 21a is provided in an air cylinder 21c fixed to an upper end of the support cylinder 24. Connected to the piston. An air pipe a from the compressor 16 is connected to the air cylinder 21c, and when compressed air is supplied into the air cylinder 21c, the piston is constantly pressed downward by the biasing force of a spring. The valve body 21b, which is in contact with the valve seat 22c at the upper end of the sleeve 22b mounted inside the upper part of the main body 22, is pushed upward to connect the flow path 20 connecting the inside of the spray bar 18 and the inside 22a of the nozzle body 22. When the supply of compressed air to the air cylinder 21c is stopped, the valve body 22b descends and comes into contact with the valve seat 22c, whereby the flow path 20 is closed.
[0010]
The control device 17 is provided with an emulsion electromagnetic opening / closing valve 25 corresponding to each emulsion valve 21 of each spraying nozzle 19 in the emulsion spraying mechanism 15, and each emulsion electromagnetic switching valve 25 is provided in the control device. These are individually operated by an emulsion changeover switch 26 that is selectively operated via an operation switch (not shown) provided. When the emulsion changeover switch 26 is ON, the valve is opened, and compressed air from the compressor 16 is opened. Is supplied to the air cylinder 21 c of the emulsion valve 21, the valve body 22 b is raised to open the flow path 20, and the valve is closed when the emulsion changeover switch 26 is OFF, so that the compressor 16 supplies the emulsion. The supply of compressed air to the air cylinder 21c of the valve 21 is stopped, the valve body 22b is lowered, and the flow path 20 is closed.
[0011]
The controller 17 is provided with a cleaning electromagnetic on-off valve (cleaning valve) 27 corresponding to each of the spray nozzles 19 in the emulsion spraying mechanism 15. The cleaning switch 28, which is selectively operated via an operation switch (not shown) provided in the apparatus, is individually operated. The cleaning air is supplied to the inside 22ac of the nozzle body 19 of the spray nozzle 19, and the inside of the nozzle 23 is air-cleaned. When the cleaning switch 28 is turned off, the valve is opened, and the emulsion valve 21 is transmitted from the compressor 16 to the emulsion valve 21. The supply of the cleaning air to the inside 22a of the nozzle body 19 is stopped, and the air cleaning in the nozzle 23 is stopped.
The electromagnetic on-off valve 25 for emulsion and the electromagnetic on-off valve 27 for cleaning are combined into one electromagnetic valve block or are combined into individual electromagnetic valve blocks, and the emulsion pump 14, the compressor 16, or the spray bar It is installed on the vehicle body 2 near 18 or attached to the spray bar 18.
[0012]
The control device 17 further includes an operation time timer (not shown) for setting an operation time (a supply time of the cleaning air to the spray nozzle 19) from an ON operation to an OFF operation of the cleaning switch 28, and a cleaning timer. A cycle timer for setting a cycle in which the ON operation of the changeover switch 28 is performed, a cleaning cycle setting unit 29 for changing and adjusting the cycle of the cycle timer, and automatically operating the air cleaning by operating the operation time timer and the cycle timer. An automatic cleaning changeover switch 30 for selecting whether or not to perform the cleaning is provided. When the automatic cleaning changeover switch 30 is turned on, the cleaning electromagnetic on-off valve 27 is periodically opened and closed, and the cleaning air is supplied to the spray nozzle 19. Is supplied, and the spray nozzle 19 is air-cleaned at a cycle determined by the cleaning cycle setter 29.
[0013]
Next, the operation of the emulsion dispersing device 10 of the asphalt finisher with the emulsion dispersing device according to the embodiment will be described.
When paving a road with the asphalt finisher 1 with the emulsion spraying device, the starter switch of the control device 11 is operated to make the asphalt finisher 1 with the emulsion spraying device operable, and then the vehicle 4 is caused to travel forward. When the pavement operation is started, each emulsion changeover switch 26 is turned ON by a command from the control device 17 to open each emulsion electromagnetic on-off valve 25, and compressed air is supplied from the compressor 16 to each spray nozzle 19 of the emulsion spraying mechanism 15. Since each emulsion valve 21 is opened by being sent to the air cylinder 21 c, the asphalt emulsion sent from the emulsion tank 13 to the spray bar 18 passes through the through hole 24 a of the support cylinder 24 and the flow path 20, and flows into the nozzle 23. It is sprayed on the lower road surface F of the road to be paved from the tip. Then, the asphalt mixture put into the hopper 5 of the vehicle 4 is sent to the front of the spreading screw 6 by the bar feeder 7 and falls on the lower road surface F on which the asphalt emulsion is scattered. 6, the asphalt mixture spread on the lower road surface F is spread by the screed 9.
[0014]
In this paving work, for example, when the width of the road to be paved becomes narrow and it becomes unnecessary to spray asphalt emulsion from all the spray nozzles 19 over the entire length of the spray bar 18, an operation switch (not shown) of the control device 17 is provided. For example, when the emulsion changeover switches 26 corresponding to the spraying nozzles 19 (such as a required number of spraying nozzles located on both sides of the spray bar 18) that do not need to be sprayed are individually selected and turned off, the selection is performed. The emulsion electromagnetic opening / closing valve 25 corresponding to the selected emulsion changeover switch 26 is closed, the air supply from the compressor 16 to the cylinder 21c of the selected emulsion valve 21 is stopped, and the emulsion valve 21 is closed and the spray bar is closed. The supply of the asphalt emulsion from the spray nozzle 18 to the nozzle 23 in the spray nozzle 19 that does not need to be sprayed is stopped. Thereby, useless consumption of asphalt emulsion can be eliminated.
[0015]
In the above description, an example in which one spray bar 18 is provided along the width direction of the vehicle 4 is shown. However, usually, the spray bar 18 is a pair of spray bars which are provided at positions shifted in the front-rear direction of the vehicle 4. The bar is configured as a telescopic spray bar that is relatively moved in the width direction of the vehicle 4. In this case, when the spray bar is expanded or contracted according to the width of the road to be paved, the front and rear spray bars overlap at the center of the vehicle 4 in the width direction, and asphalt emulsion is overlapped and sprayed on this portion. Therefore, by selectively stopping the spraying of the asphalt emulsion from the spraying nozzle 19 of one of the spray bars corresponding to the overlapping portion in the same manner as described above, the excess asphalt emulsion is sprayed on the lower road surface F. Can be prevented. Therefore, there is no need to provide a surplus emulsion collecting means for receiving the surplus asphalt emulsion in the tray and collecting the surplus asphalt emulsion in the emulsion tank 13.
[0016]
Next, if the pavement operation is continued for a long time, the emulsion adheres to the nozzle 23 of the spraying nozzle 19 of the emulsion spraying mechanism 15 and a problem that the spraying angle becomes narrow occurs. In the control device 17, by operating an operation switch or the like (not shown) to individually select and turn on the cleaning changeover switches 28 corresponding to the spray nozzles 19 in which the malfunction has occurred, the selected cleaning changeover switches 28 Since the cleaning electromagnetic on-off valve 27 corresponding to each of the nozzles is opened, air is supplied from the compressor 16 to the inside 22a of the nozzle body 22 of the selected spray nozzle 19, and the cleaning air is strongly jetted from the nozzle 23, The asphalt emulsion attached to the nozzle 22a and the nozzle 23 is discharged to the outside, and the air cleaning of the selected spraying nozzle 19 can be performed at the same time. That.
As a result, the cleaning air can be sent only to the spray nozzles 19 where the asphalt emulsion is attached and clogged, and the spray nozzles 19 can be preferentially air-cleaned, so that the air cleaning work can be performed efficiently. Can be.
[0017]
When the automatic cleaning changeover switch 30 is turned on in the control device 17 separately from the air cleaning described above, the operation time timer and the cycle timer in the control device 17 are operated, and the cleaning cycle setting device is operated. 29, all the electromagnetic switching valves 27 for cleaning are operated by the operation time timer in accordance with a time period set by the periodic timer at a time interval, for example, a time interval until the pavement advances by a predetermined distance. Are opened all at once for a predetermined time set in the above, the cleaning air is sent from the compressor 16 to all the spray nozzles 19, and the air washing of the spray nozzles 19 is automatically performed. It goes without saying that the paving work is interrupted when this automatic air cleaning is performed.
[0018]
As described above, all the spray nozzles 19 attached to the spray bar 18 are air-cleaned periodically (periodically) and automatically, so that the spray angle of all the spray nozzles 19 by the nozzles 23 is asphalt adhesion. , It is possible to always spray a uniform asphalt emulsion without narrowing. Therefore, it is not necessary for the operator of the machine to constantly monitor the spraying state of the asphalt emulsion from the spraying nozzle 19 during paving work and find any clogging of the spraying nozzle 19, thereby reducing the work load on the operator. can do.
[0019]
【The invention's effect】
As described above, according to the emulsion spraying device of the asphalt finisher with the emulsion spraying device according to the present invention, the spray nozzle attached to the spray bar of the emulsion spraying mechanism supplies the asphalt emulsion from the spray bar into the spray nozzle. Roads to be paved because emulsion valves that individually open and close flow paths and cleaning valves that individually open and close flow paths that supply cleaning air from the compressed air supply source into the spray nozzle are provided. Spraying can be stopped by appropriately selecting a spray nozzle that does not require asphalt emulsion depending on the width, and wasteful consumption of asphalt emulsion can be eliminated.
[0020]
Further, when the emulsion spraying mechanism has a spray bar that expands and contracts in the width direction of the vehicle, the spray nozzle of one of the spray bars in the overlapping portion of the spray bar is selected according to the pavement width, and the spray nozzle is selected from the selected spray nozzle. Therefore, it is necessary to provide a surplus emulsion collecting means for collecting the surplus asphalt emulsion sprayed from the spray nozzle of one of the spray bars in the overlapping portion into the emulsion tank as in the related art. Absent.
Furthermore, since cleaning air can be individually supplied to a plurality of spray nozzles, it is possible to select a spray nozzle that requires air cleaning and send cleaning air to the nozzle in a concentrated manner to efficiently perform air cleaning. it can.
[Brief description of the drawings]
FIG. 1 is a side view showing an asphalt finisher with an emulsion dispersing device provided with an emulsion dispersing device according to one embodiment of the present invention.
FIG. 2 is a plan view of the same.
FIG. 3 is a system diagram showing an emulsion spraying device in an asphalt finisher with an emulsion spraying device according to one embodiment of the present invention.
FIG. 4 is a longitudinal sectional view showing a spray nozzle portion of the emulsion spray apparatus.
[Explanation of symbols]
1 Asphalt finisher with emulsion spraying device 2 Body 4 Vehicle (running vehicle)
5 Hopper 6 Spreading screw 7 Bar feeder 9 Screed 10 Emulsion spraying device 13 Emulsion tank 14 Emulsion pump 15 Emulsion spraying mechanism 16 Compressor (compressed air supply source)
17 Control device 18 Spray bar 19 Spray nozzle 20 Flow path 21 Emulsion valve 21b Valve element 21c Air cylinder 22 Nozzle body 23 Nozzle 25 Emulsion solenoid on-off valve 26 Emulsion switch 27 Washing solenoid on-off valve (wash valve)
28 Cleaning switch 29 Cleaning cycle setting device 30 Automatic cleaning switch

Claims (1)

A plurality of spray nozzles are provided at intervals on a spray bar arranged in the width direction of the traveling vehicle, and the asphalt emulsion supplied from the emulsion tank mounted on the traveling vehicle to the spray bar, the asphalt mixture is used. In an asphalt finisher equipped with an emulsion spraying device for spraying on the lower road surface to be spread by each of the spray nozzles,
Each of the spray nozzles individually opens and closes a flow path for supplying asphalt emulsion from the spray bar into the spray nozzle, and a cleaning air from the compressed air supply source mounted on the traveling vehicle into the spray nozzle. An emulsion spraying device for an asphalt finisher with an emulsion spraying device, comprising: a washing valve that individually opens and closes supply channels.

Images