JP2003129411A - Paving and leveling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep an emulsion melted without providing a heater separately on respective passages for supplying the emulsion to an emulsion diffuser so that the structure of the diffuser is simplified and energy consumed by the diffuser is saved. SOLUTION: A first feed pipe 25A for feeding the emulsion from a emulsion tank 17 to the emulsion diffuser 6 and a first feed back pipe 26A for feeding back the emulsion from the emulsion diffuser 6 to the emulsion tank 17 are arranged in contact with a lower layer hopper sideboard 28 so as to enable heat transmission from the sideboard to both pipes. Meanwhile, a second feed pipe 25B and a second feed back pipe 26B are arranged apart from the lower layer hopper sideboard 28. As heat from the heated lower layer hopper sideboard 28 is transmitted to the first feed pipe 25A and first feed back pipe 26A, the emulsion flowing through both pipes is heated. The flow passage of the emulsion is shifted between the first feed pipe 25A and the second feed pipe 25B when the direction of a directional control valve 20A is shifted, and between the first feed back pipe 26A and the second feed back pipe 26B when the direction of a directional control valve 20B is shifted. Thus, it becomes possible to discharge the emulsion, of which the temperature is controlled within a prescribed range, from a spray nozzle 6a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leveling machine such as an asphalt finisher for supplying and paving a paving material such as an asphalt mixture on a road surface sprayed with an asphalt emulsion.

[0002]

2. Description of the Prior Art As a leveling machine such as an asphalt finisher for supplying and spreading asphalt mixture on a road surface sprayed with asphalt emulsion, a hopper for storing the asphalt mixture in a self-propelled traveling vehicle, Asphalt mixture feeding device, a pair of left and right, front and rear expandable and contractible spray bar, a screw behind the spray bar to spread the asphalt mixture to the left and right, A pair of screeds that can be stretched to the left and right are provided.While asphalt emulsion is sprayed onto the unpaved roadbed with a spray bar, the asphalt mixture is sent onto the sprayed emulsion with a sending device and screwed onto the roadbed. There is known a leveling machine equipped with an asphalt emulsion spraying device for spreading and leveling with a screed (Japanese Patent Laid-Open No. HEI-1)
No. 1-256511).

A heater is attached to the emulsion tank of the asphalt emulsion spraying mechanism in the leveling machine to maintain the molten state so that the emulsion does not solidify. In addition, a plurality of pairs of nozzles are attached to the spray bar so as to face downward in the ejection direction, a heater is provided for each nozzle, and the nozzle temperature is constantly maintained at a predetermined temperature so that the emulsion does not solidify. There is.

[0004]

The asphalt emulsion spraying machine requires a heater to be attached to each of the emulsion tank and a plurality of pairs of nozzles in order to keep the emulsion in a molten state so that the emulsion does not solidify, resulting in a complicated structure. However, there is also a problem that extra energy is consumed. An object of the present invention is to provide a heater separately by arranging a feed pipe for supplying emulsion and a return pipe for returning emulsion on the side of a lower hopper heated by a pavement material such as high temperature asphalt mixture. It is an object of the present invention to provide a laying machine such as an asphalt finisher equipped with an emulsion spraying device that can maintain an emulsion in a molten state without using the emulsion, has a simple structure, and can save energy.

[0005]

In order to achieve the above object, a laying machine according to the invention of claim 1 is mounted on a self-propelled vehicle and a front side of the self-propelled vehicle to store a pavement material. Lower hopper, an upper hopper mounted on the rear side of the lower hopper to store the pavement material, a lower layer feeder that supplies the pavement material stored in the lower layer hopper to the road surface, and a pavement supplied from the lower layer hopper. The lower layer screw that spreads the material to the left and right, the lower layer screed that stretches the paving material spread by the lower layer screw, and the pavement material that is supplied from the upper layer hopper to the left and right of the lower layer screed In a laying machine equipped with an upper layer screw that expands and a pavement material that is spread by the upper layer screw and an upper layer screed that can expand and contract to the left and right, an emulsion tank that stores emulsion is located in front of the lower hopper. An emulsion spraying device for spraying emulsion on the road surface is installed in front of the rear end of the lower bar feeder, and a feed pipe for supplying emulsion from the emulsion tank to the emulsion spraying device and an emulsion tank from the emulsion spraying device. At least one of the return tubes for returning the emulsion to the lower layer hopper is arranged laterally of the lower layer hopper so as to be capable of conducting heat with the lower layer hopper.

A laying machine according to a second aspect of the invention is
The leveling machine according to claim 1, wherein a plurality of the feed pipes and the return pipes are provided, and a part of each of the feed pipes and the return pipes is a heating pipe that is in thermal conductive contact with the lower hopper, and the rest of each is provided. Is a non-heated pipe that is separated from the lower hopper.

A leveling machine according to a third aspect of the invention is
3. The leveling machine according to claim 2, wherein the heating pipe and the non-heating pipe are above the emulsion temperature supplied to the emulsion spraying device,
It is characterized in that the emulsion is allowed to flow by being selectively switched according to the lower limit value.

A leveling machine according to a fourth aspect of the invention is
The leveling machine according to any one of claims 1 to 3 is characterized in that the feed pipe and the return pipe are covered with a heat insulating material.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a leveling machine A such as an asphalt finisher for spraying an emulsion such as an asphalt emulsion and for leveling a paving material such as an asphalt mixture. This leveling machine A includes a self-propelled vehicle 1, a lower hopper 2 at a position on the front side of a main body frame 14 of the self-propelled vehicle 1, which stores a first paving material (paving material), and a lower hopper 2. An upper layer hopper 3 which is located above the rear side and stores the second pavement material (pavement material), and a pair of left and right lower layer bar feeders 4 which feed the first pavement material stored in the lower layer hopper 2 onto the road surface. 4 and a pair of left and right traveling crawlers 13, 13
Behind the pair of left and right traveling crawlers 13, and a lower layer screw 5 that can extend to the left and right to spread the first pavement material supplied on the road surface from the respective lower layer bar feeders 4 and 4 to the left and right. There is a pair of left and right lower layer bar feeders 4, 4 which are arranged in front of the rear ends of the lower layer feeders and which spreads the emulsion on the road surface. The lower layer screed 7 that is stretchable to the left and right for laying out the first pavement material and the second layer that is behind the lower layer screed 7 and has fallen from the upper layer hopper 3
An upper layer screw 9 that spreads the second paving agent supplied to the road surface through the upper layer spreader roll 8 that adjusts the supply amount of the paving material to the left and right and can be extended to the left and right, and an upper layer screw 9 that is behind the upper layer screw 9 An upper layer screed 10 that is stretchable to the left and right is installed to spread the second pavement material that is spread to the left and right.

In front of the lower layer hopper 2, a power unit 15 for driving a pair of left and right traveling crawlers 13, 13 is located on the upper side, and a hydraulic oil tank 16 is arranged on the lower side so that the main body frame 14 respectively. It is installed. The power unit 15 mainly includes an engine (not shown), a hydraulic pump (not shown) directly connected to the output shaft of the engine, and an emulsion pump 18. Also,
The emulsion unit 17 for storing emulsion is the power unit 15
Also, since it is mounted on the main body frame 14 between the hydraulic oil tank 16 and the lower hopper 2, and the bottom of the emulsion tank 17 projects to near the road surface of the bottom of the main body frame 14,
The capacity of the emulsion tank 17 is increasing. Of course, the emulsion tank 17 can be arranged at an appropriate position in front of the power unit 15 and the hydraulic oil tank 16.
Here, the height of the power unit 15 and the emulsion tank 1
It is preferable that the height of 7 and the height of the upper surface of the lower hopper 2 are substantially the same. By making the heights substantially the same, it is easy to load the first pavement material on the lower hopper 2, and the visibility from the driver's seat is widened to improve workability.

One end of a pair of left and right leveling arms 12, 12 arranged on both sides of the main body frame 14 rotates vertically on a pivot 11a at the lower end of a hydraulic cylinder 11 mounted on the main body frame 14 of the vehicle 1. It is rotatably mounted. At the other ends of the pair of left and right leveling arms 12, the lower layer screed 7 is located on the front side, and the upper layer screed 10 is located on the rear side, and they are suspended vertically so that their positions can be adjusted.

Lower layer screw 5 and upper layer screw 9
Are attached to a rear frame (not shown) of the main body by shifting their positions forward and backward, respectively, and can be vertically adjusted by hydraulic cylinders (not shown) and can be extended to the left and right. There is.

The emulsion pump 18 directly connected to the output shaft of the engine sucks up the emulsion from the emulsion tank 17 through the filter 19 and supplies the emulsion to the supply port of the switching valve 20A. The switching valve 20A has two discharge ports and is connected to one ends of the first feed pipe 25A and the second feed pipe 25B, respectively, and the other ends of the first and second feed pipes 25A and 25B are respectively Through the check valves 21A and 21B, they are gathered into one feed pipe 25C and connected to the first connection port of the three-way valve 22. The second connection port of the three-way valve 22 is a pipe 25.
Connected to the emulsion spraying device 6 by D, and the emulsion spraying device 6
In the pipe 25D near the
And a low temperature thermosensor 24. Three-way valve 2
The third connection port of 2 is a switching valve 20B by a pipe 25E.
Is connected to the supply port of. This switching valve 20B has two discharge ports, and each has a first return pipe 26A.
And the second return pipe 26B is connected to one end, and the other ends of the first and second return pipes 26A and 26B are combined into one return pipe 26C and connected to the emulsion tank 17.

When the high temperature thermosensor 23 and the low temperature thermosensor 24 respectively detect a preset upper limit temperature and a preset lower limit temperature, a signal is sent to a controller (not shown), and the controller notifies them. The switching valve 20A is switched so that the emulsion pump 18 and the second feed pipe 25B are connected, and the switching valve 20B is connected to the pipe 25E.
And the second return pipe 26B is switched to be connected.

The first feed pipe 25A and the first return pipe 26A are
Lower hopper side plates 28 on opposite sides of the lower hopper 2
It is attached to be in contact with the
The outer periphery is covered with a heat insulating material 27. The outer circumferences of the second feed pipe 25B and the second return pipe 26B are covered with the heat insulating material 27, and the second feed pipe 25B and the second return pipe 26B are separated from the lower hopper side plate 28 and are separated from the main body frame 1
It is attached to the No. 4 and is a non-heating pipe. Because of this structure, the first hopper stored in the lower hopper 2
The first feed pipe 25A and the first return pipe 26A are heated by heat conduction from the lower hopper side plate 28 heated by the paving material, and the temperature heated by the heat insulating material 27 is kept constant. Further, the second feed pipe 25B and the second return pipe 26B are
The lower hopper side plate 28 is provided by the heat insulating material 27 around them.
It is designed to be shielded from the nearby heated atmosphere.

Next, the operation of the leveling machine A having the above structure will be described. In order to spread the paving material, the first and second paving materials are moved from the self-propelled loading device (not shown) which is traveling alone in front of the self-propelled vehicle 1 to the lower hopper of the self-propelled vehicle 1. 2 and the upper hopper 3 are loaded respectively. On the other hand, in order to improve the adhesion between the road surface to be laid in the future and the first layer (first paving material layer) laid in the lower screed 7, the lower bar is located behind the traveling crawler 13. The emulsion is discharged onto the road surface from a plurality of spraying nozzles 6a attached to the lower end of the emulsion spraying device 6 in front of the falling position of the first pavement material supplied from the rear end of the feeder 4 onto the road surface. Then, the first pavement material is supplied onto the road surface from the rear end of the lower layer bar feeder 4, spread to the left and right by the lower layer screw 5, and spread by the lower layer screed 7 to form the first layer (first pavement material layer). The paved road surface is formed. Further, the second pavement material is supplied onto the first layer via the upper layer spreader roll 8, is spread left and right by the upper layer screw 9, and is spread by the upper layer screed 10 to form the second layer (second pavement material layer). Is formed, and the paved road surface consisting of two layers is finished.

According to the leveling machine A, the emulsion spraying step, the first layer leveling step and the second layer leveling step can be carried out continuously by one machine. Therefore, the construction period can be shortened, the traffic congestion due to the construction can be alleviated, or the vibration or noise can be reduced, which leads to the reduction of the construction cost such as the labor cost and the machine cost.

Usually, it is necessary to heat the emulsion to about 70 ° C. in the vicinity of a plurality of spray nozzles 6a of the emulsion spraying device 6 so that the emulsion can be easily discharged to a molten state. The first pavement material loaded from the self-propelled loading device to the lower hopper 2 is about 150 ° C-
Since it is heated to 180 ° C., the lower hopper side plate 28 is also heated by heat conduction. The first feed pipe 25A and the first return pipe 26A are attached in contact with the heated lower layer hopper side plate 28, so that the first feed pipe 2 is heated by heat conduction.
The emulsion in the tubes of 5A and the first return tube 26A is also heated. Since the high temperature thermosensor 23 detects the high temperature side of the emulsion temperature flowing in the vicinity of the plurality of spray nozzles 6a of the emulsion spraying device 6 and the low temperature thermosensor 24 detects the low temperature side, the spray nozzles are set. The temperature of the emulsion flowing near 6a is always maintained in the optimum temperature range of about 70 ° C.

For example, the emulsion discharged by the emulsion pump 18 flows in the first feed pipe 25A heated by the lower hopper side plate 28 and the temperature thereof is increased by the high temperature thermosensor 23.
If it is detected by the above, since the temperature is higher than the predetermined upper limit set temperature, the detected signal causes the discharge port of the switching valve 20A to be switched via the controller and the second feed not heated by the lower hopper side plate 28. The unheated emulsion flows in the pipe 25B, a part of the emulsion is discharged from the spray nozzle 6a, and the rest flows in the pipe 25E, the switching valve 20B and the second return pipe 26B and is returned to the emulsion tank 17 without being heated. Therefore, the emulsion temperature in the emulsion tank 17 gradually decreases.

On the contrary, when the emulsion discharged from the emulsion pump 18 flows through the first feed pipe 25A heated by the lower hopper side plate 28 and its temperature is detected by the low temperature thermosensor 24, it is heated. Since the predetermined temperature has not been reached by only the first feed pipe 25A, the detected signal switches the discharge port of the switching valve 20B via the controller, and the inside of the first return pipe 26A heated by the lower layer hopper side plate 28. And is stored in the emulsion tank 17, and the emulsion temperature in the emulsion tank 17 gradually rises. In this way, the heating pipes 25A and 26A and the non-heating pipes 25B and 26B are selectively switched according to the upper and lower limit values of the emulsion supplied to the emulsion spraying device 6 through the controller to flow the emulsion, By controlling the temperature, the spray nozzle 6
From a, an emulsion in a predetermined temperature range (about 70 ° C.) is discharged.

In the leveling machine A of the above embodiment, the feed pipes 25A and 25B and the return pipes 26A and 26B are provided.
Although two are provided for each, the number is not limited to this, and each may be one or a plurality of three or more.
In case of providing this, at least one of the feed pipe and the return pipe may be used as heating pipe, and in the case of providing a plurality of pipes, some of them shall be used as heating pipes and the remaining shall be non-heated pipes. You can

[0022]

As described above, in the leveling machine according to the first aspect of the present invention, at least the feed pipe for supplying the emulsion from the emulsion tank to the emulsion dispersion device and the return pipe for returning the emulsion from the emulsion dispersion device to the emulsion tank. One is disposed on the side of the lower layer hopper so as to be capable of conducting heat with the lower layer hopper, so by heat conduction from the lower layer hopper that is overheated by the stored pavement material,
Since the emulsion in at least one of the feed tube for supplying the emulsion and the return tube for returning the emulsion is heated, it is not necessary to provide a separate heater to maintain the molten state of the emulsion discharged from the emulsion spraying device. The structure is simple.

In the laying machine according to the second aspect, a plurality of feed pipes for supplying emulsion from the emulsion tank to the emulsion dispersion device and a plurality of return pipes for returning emulsion from the emulsion dispersion device to the emulsion tank are respectively arranged. The heating pipes that make contact with the lower layer hopper so as to be able to conduct heat are part of the heating pipes, and the remaining number is the non-heating pipes that are separated from the lower layer hopper. The temperature of the emulsion flowing to the emulsion disperser can be adjusted by switching to a feed pipe that is either piping or unheated piping, or by switching the emulsion returned to the emulsion tank to a return tube that is heated or unheated piping. .

According to a third aspect of the present invention, in the laying machine, the feeding pipe for supplying the emulsion from the emulsion tank to the emulsion dispersing device and the heating pipe and the non-heating pipe in the returning pipe for returning the emulsion from the emulsion dispersing device to the emulsion tank are composed of emulsion. The upper and lower limits of the emulsion temperature supplied to the spraying device are selectively switched according to the lower limit value so that the emulsion flows.Therefore, the temperature of the emulsion flowing to the emulsion spraying device is accurately adjusted to a predetermined temperature range, Can be maintained.

In the laying machine according to the present invention, the feed pipe for supplying the emulsion from the emulsion tank to the emulsion dispersing device and the return pipe for returning the emulsion from the emulsion dispersing device to the emulsion tank are covered with the insulating material. The emulsion in the feed tube and the return tube can be maintained at a controlled constant temperature without being affected by the external temperature.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a leveling machine according to the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a circuit diagram of an emulsion.

[Explanation of symbols]

1 self-propelled vehicle 2 Lower hopper 3 Upper layer hopper 4 Lower layer bar feeder 5 Lower layer screw 6 Emulsion spraying device 6a Spray nozzle 7 Lower screed 9 Upper screw 10 Upper screed 15 power units 17 Emulsion tank 18 emulsion pump 22 three-way valve 23 High temperature thermo sensor 24 Thermosensor for low temperature 25A first feed pipe 25B second feed pipe 26A 1st return pipe 26B Second return pipe 27 Insulation 28 Lower hopper side plate A laying machine

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinichiro Uchiyama             Niigata Prefecture Kitakanbara-gun Seiro-cho 5-2756-3 East Port             No. Niigata Iron Works Co., Ltd. Niigata construction machinery factory F-term (reference) 2D052 AA09 AB01 AC01 BA20 CA09                       DA02 DA14 DA21

Claims (4)

[Claims] 1. A self-propelled vehicle, a lower layer hopper mounted on the front side of the self-propelled vehicle to store the pavement material, an upper layer hopper mounted on the rear side of the lower layer hopper to store the pavement material, and a lower layer hopper. Lower layer bar feeder that supplies the paved material that has been supplied to the road surface, a lower layer screw that spreads the paving material that is supplied from the lower layer feeder to the left and right, and a lower layer screed that can stretch the paving material that is spread by the lower layer screw to the left and right And the upper layer screw that is placed behind the lower layer screed and spreads the paving material supplied from the upper layer hopper to the left and right, and the upper layer screed that can stretch to the left and right to spread the paving material spread by the upper layer screw. In the leveling machine, the emulsion tank that stores the emulsion is placed in front of the lower hopper, and the emulsion spraying device that sprays the emulsion on the road surface is installed from the rear end of the lower bar feeder. At least one of a feed pipe for supplying the emulsion from the emulsion tank to the emulsion dispersion device and a return pipe for returning the emulsion from the emulsion dispersion device to the emulsion tank to the side of the lower hopper and heat conduction with the lower hopper. A leveling machine characterized by being installed in. 2. A plurality of the feed pipes and the return pipes are respectively provided, a part of each of the feed pipes and the return pipes is a heating pipe that is in thermal contact with the lower layer hopper, and the remaining number of each is from the lower layer hopper. The leveling machine according to claim 1, wherein the unheated pipes are separated from each other. 3. The heating pipe and the non-heating pipe are selectively switched according to the upper and lower limits of the emulsion temperature supplied to the emulsion spraying device so that the emulsion flows. The leveling machine according to claim 2. 4. The leveling machine according to claim 1, wherein the feed pipe and the return pipe are covered with a heat insulating material.