JP2004003202A - Emulsion spray device for asphalt finisher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily replenish an asphalt emulsion in a drum or the like into an emulsion tank while keeping the drum put on the ground, without newly providing a special pump. <P>SOLUTION: This emulsion spray device includes an emulsion circulation path 15 through which the asphalt emulsion retained in an emulsion tank 7 is fed from a discharge pump 13 via spray nozzles 10 and then back to the emulsion tank 7 by return ducts 9 and 9a when spraying of the emulsion is interrupted. A branch part 17 is provided in the suction side duct 8b of the discharge pump 13. By operating selector valves 11 and 21, the branch part is switched to either a path 18 leading to the emulsion tank 7 or a path 20 leading to, e.g., a drum 19 from which the emulsion is replenished into the emulsion tank from the outside. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an emulsion spraying device for an asphalt finisher.
[0002]
[Prior art]
As a leveling machine that spreads asphalt mix on unpaved roadbed, asphalt pavement and its cut surface, concrete pavement, etc., as a leveling machine, a hopper that stores asphalt mix in a traveling vehicle, an asphalt A device for delivering the mixture, a device for dispersing the emulsion, and a screed are provided, and the device for dispersing the asphalt mixture from the hopper onto the dispersed emulsion on the lower surface of the road while spraying the emulsion on the lower surface of the road with the disperser. There is known an asphalt finisher equipped with an emulsion dispersing device, which is sent out and spread by screed (JP-A-4-203006, U.S. Pat. No. 5,069,578).
[0003]
In the emulsion spraying device mounted on the asphalt finisher, an emulsion tank is provided at a substantially central portion of the traveling vehicle, and the asphalt emulsion stored therein is pumped by a discharge pump, and before the asphalt mixture is supplied. It can be sprayed on the lower road surface via a spray nozzle.
[0004]
[Problems to be solved by the invention]
By the way, the conventional emulsion dispersing apparatus described above has the following disadvantages.
That is, the emulsion tank is disposed at a relatively high position substantially at the center of the traveling vehicle, and a manhole, which is an emulsion injection port, associated with the emulsion tank is also disposed at a relatively high position. Therefore, when a small amount of asphalt emulsion is to be supplied from the drum into the emulsion tank in a trial work or the like, the drum has to be lifted to the height of the manhole, which is very troublesome.
[0005]
The present invention has been made in view of the above circumstances, and its purpose is to provide an asphalt emulsion inside to an emulsion tank while a drum or the like is installed on the ground without newly providing a dedicated pump. An object of the present invention is to provide an emulsion dispersing device in an asphalt finisher which can be easily replenished.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, in the emulsion spraying apparatus of the asphalt finisher according to the present invention, when spraying the emulsion, the asphalt emulsion stored in the emulsion tank is pressure-fed by a discharge pump and sprayed from a spray nozzle to spray the emulsion. At the time of stoppage, in the emulsion spraying device in the asphalt finisher provided with an emulsion circulation path for returning the asphalt emulsion stored in the emulsion tank from the discharge pump to the emulsion tank via a spray nozzle through a return pipe, the suction side of the discharge pump A branch portion is provided in the pipe so that a path can be switched between a path leading to the emulsion tank and a path leading to an emulsion supply source for replenishing the emulsion tank with emulsion from the outside.
According to a second aspect of the present invention, there is provided an emulsion dispersing device for an asphalt finisher according to the first aspect, wherein a filter is interposed between the branch portion and the discharge pump.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a side view of the asphalt finisher, and FIG. 2 is a plan view. As shown in these figures, an asphalt finisher is provided in a self-propelled traveling vehicle 1 with a hopper 2 containing asphalt mixture, an asphalt mixture delivery device 3, and an asphalt mixture in the delivery device 3. A pair of asphalt emulsion spray bars 4A and 4B are provided on the front side of the spreading screw 3b, which is a delivery section of the ascending and retractable, left and right and front and rear parts, and left and right and front and rear on the rear side of the spreading screw 3b. A pair of screeds 5A and 5B are provided so as to be extendable and contractible. The asphalt emulsion is sprayed on the unpaved roadbed 6 as a lower road surface by spray bars 4A and 4B, and the asphalt mixture is scattered from the hopper 2. The screeds 5A and 5B spread out the spread emulsion on the roadbed 6 and spread out the spread screeds 5A and 5B.
[0008]
The delivery device 3 includes a bar feeder 3a that carries out the asphalt mixture from the hopper 2, and the above-described spreading that spreads the asphalt mixture A carried by the bar feeder 3a in the width direction of the traveling vehicle 1 and sends the asphalt mixture A onto the roadbed 6. And a screw 3b. As described above, the spray bars 4A, 4B and the screeds 5A, 5B are supported by the traveling vehicle 1 such that the left and right pairs are displaced in parallel to the front and rear of the traveling direction of the traveling vehicle 1. In the width direction (left-right direction), so that the dispersion width of the emulsion and the spread width of the asphalt mixture A can be arbitrarily adjusted. The traveling vehicle 1 in the figure is a crawler type, but there is also a wheel type.
[0009]
Referring to the emulsion spraying device mounted on the asphalt finisher, as shown in FIG. 3, the spray bars 4A, 4B are connected to the emulsion tank 7 by emulsion feed pipes 8, 8a and return pipes 9, 9a. ing. The spray nozzles 10 provided on the spray bars 4A and 4B have built-in air cylinders, which are respectively opened and closed by the air cylinders.
[0010]
The feed pipe 8 is provided with an on-off valve 11, a filter 12, and an emulsion discharge pump 13 (hereinafter simply referred to as a discharge pump 13) in the above order from the upstream end to the downstream end of the feed pipe 8. The discharge pump 13 is rotated by a hydraulic motor 14, sends the emulsion in the emulsion tank 7 to the spray bars 4A, 4B, and ejects the emulsion from the spray nozzles 10. For example, a gear pump type or the like is used. Optionally, other discharge pumps can be used. Although a hydraulic motor of a piston pump type is used as the hydraulic motor 14, other types of rotation driving means such as an electric motor may be used.
[0011]
The feed pipes 8 and 8a, the return pipes 9 and 9a, and the discharge pump 13 form an emulsion circulation path 15. In the emulsion circulation path 15, when spraying the emulsion, the asphalt emulsion stored in the emulsion tank 7 is pressure-fed by the discharge pump 13, guided to the spray nozzle 10 through the feed pipes 8 and 8 a, and from there, the roadbed 6. When the emulsion spraying is stopped, the asphalt emulsion stored in the emulsion tank 7 is guided from the discharge pump 13 to the spraying nozzle 10 via the feed pipes 8 and 8a, and returned via the spraying nozzle 10. The pipes 9 and 9a return to the emulsion tank 7. The reason why the asphalt emulsion is circulated when the emulsion is not sprayed from the spray nozzle 10 is to ensure the fluidity of the asphalt emulsion.
[0012]
Here, a branch portion 17 is provided on a suction side pipe 8 b of the discharge pump 13 which is a part of the feed pipe 8. This branch portion 17 is connected to an emulsion tank side pipe 18 which is a path leading to the emulsion tank 7 and a supply side pipe 20 which is a path leading to an emulsion replenishment source such as a drum 19 for supplying emulsion to the emulsion tank 7 from the outside. Have been. The emulsion tank side pipe 18 and the supply side pipe 20 are provided with switching valves 11 and 21, respectively, for switching the suction side of the discharge pump 13 between the emulsion tank side pipe 18 and the supply side pipe 20. Arbitrarily.
[0013]
The on-off valves 11 and 13 may be switched by manual operation, or may be switched automatically such as a solenoid valve, or a three-way valve combining the functions of both on-off valves. It may be something like Further, the filter 12 is interposed between the branch portion 17 and the discharge pump 13.
[0014]
In FIG. 3, reference numeral 23 denotes a hot oil feed pipe, and 24 denotes a hot oil return pipe, which is used to heat the emulsion nozzle 10 so that the emulsion does not solidify. 25 is a drain pipe.
[0015]
Next, the operation of the asphalt finisher emulsion dispersing apparatus having the above configuration will be described.
When emulsion spraying is started by a driver's switch operation, compressed air is sent from an air circuit (not shown) to an air cylinder of the spraying nozzle 10, the spraying nozzle 10 is opened, and emulsion spraying is started.
That is, in advance, the on-off valve 11 is opened and the on-off valve 21 is closed, and the asphalt emulsion from the emulsion tank 7 is driven by the discharge pump 13 through the emulsion tank side pipe 18, the branch portion 17, and the suction side pipe 8b. It is sucked into the discharge pump 13, guided from the discharge part to the spray nozzles 10 of the spray bars 4 </ b> A and 4 </ b> B via the feed pipe 8, and sprayed on the roadbed 6 therefrom.
[0016]
On the other hand, when the spraying nozzle 10 stops spraying in the "closed" state, the discharge pon 13 is still driven, and the asphalt emulsion is discharged from the emulsion tank 7 through the emulsion tank side pipe 18 or the like as described above. From the discharge portion to the spray nozzles 10 of the spray bars 4A and 4B via the feed pipe 8, and returned to the emulsion tank 7 via the return pipes 9 and 9a via the spray nozzles 10.
[0017]
Here, when refilling the asphalt emulsion from the drum 19 into the emulsion tank, the on-off valve 18 is closed and the on-off valve 21 is opened in advance. In this state, the spray nozzle 10 is closed and the discharge pump 13 is driven. At this time, even if the drum 19 is kept in contact with the ground, the asphalt emulsion in the drum 19 can be sucked up by the suction action of the discharge pump 13, and the sucked asphalt emulsion is sent to the feeding pipe 8, The emulsion can be injected into the emulsion tank 7 through the return pipe 8a and the return pipes 9 and 9a.
[0018]
Further, in this embodiment, since the filter 12 is interposed between the branch portion 17 and the discharge pump 13, even if the asphalt emulsion in the emulsion tank 7 is used, an external emulsion replenishing source such as the drum 19 can be used. Even the asphalt emulsion supplied from the filter passes through the filter 12, so that only one filter 12 needs to be installed.
[0019]
The above-described embodiment is merely an example of the present invention, and the design can be appropriately changed as needed without departing from the gist of the invention.
For example, in the above-described embodiment, the case where the asphalt emulsion is sprayed on the lower road surface before the asphalt mixture is supplied has been described as an example. However, the present invention is not limited to this, and the asphalt emulsion may be spread on the lower road surface. The present invention is also applicable to the case where asphalt emulsion is sprayed on the paved surface of the asphalt mixture.
[0020]
【The invention's effect】
As described above, according to the present invention, the original emulsion circulation path can be used as it is for emulsion replenishment, and therefore, a drum can or the like is installed on the ground without newly providing a dedicated pump. The internal asphalt emulsion can be easily supplied to the emulsion tank.
If a filter is interposed between the branch and the discharge pump, the filter can be used for filtering the emulsion in the emulsion tank 7 or for filtering the emulsion from an external emulsion supply source. And the number of filters to be installed can be reduced.
[Brief description of the drawings]
FIG. 1 is an overall side view of an emulsion spraying device in an asphalt fischer according to the present invention.
FIG. 2 is a plan view of the body of the emulsion spraying device in the asphalt fischer according to the present invention.
FIG. 3 is a piping diagram of an emulsion spraying device in an asphalt finisher according to the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 traveling vehicle 3 delivery device 7 tank 4A, 4B spray bar 10 spray nozzle 11, 21 on-off valve 12 filter 13 emulsion discharge nozzle 17 branching section 18 emulsion tank side piping (path leading to emulsion tank)
19 Drum cans (emulsion supply source)
20 Supply side piping (path leading to emulsion supply source)

Claims (2)

When the emulsion is sprayed, the asphalt emulsion stored in the emulsion tank is pumped by a discharge pump and sprayed from the spray nozzle, and when the emulsion spraying is stopped, the asphalt emulsion stored in the emulsion tank is sprayed from the discharge pump through the spray nozzle. And an emulsion spraying device in an asphalt finisher having an emulsion circulation path returning to the emulsion tank by a return pipe,
An asphalt finisher characterized in that a branch portion is provided in a suction side pipe of the discharge pump so that a path leading to the emulsion tank and a path leading to an emulsion replenishing source for replenishing the emulsion tank with emulsion from the outside can be switched. Emulsion sprayer. The emulsion spraying device in the asphalt finisher according to claim 1,
An emulsion spraying device in an asphalt finisher, wherein a filter is interposed between the branch portion and the discharge pump.

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