JPH09217315A - Asphalt finisher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To treat a high-fluidity high-temperature asphalt compound. SOLUTION: A screed 5 is provided to the rear end by an arm 6 that has been connected to the body of an asphalt finisher 1. A level roller 10 is arranged in the central part of the arm. An outer pipe 12 is vertically moved by a hydraulic cylinder 18 that has been fixed to the arm. The hydraulic motor 13 is arranged to the upper end of the outer pipe 2. The hydraulic motor turns the screw rod in the inside of the outer pipe. An inner pipe is inserted inside the outer pipe 12, and a nut part is provided to the upper end of the inner pipe. The screw rod is engaged with the nut part. A roller 17 is arranged to the lower end of the inner pipe. The outer pipe is quickly and roughly moved by the hydraulic cylinder 18, and the inner pipe 15 and the roller 17 are finely moved by the hydraulic motor 13 with regard to the outer pipe 12. The level roller 10 is adjusted to suit a high-fluidity compound, and the position of the screed 5 is set up. When there is any obstacle during the work, the level roller 10 is immediately extended by the hydraulic cylinder 18 to raise up the position of the screed 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asphalt finisher used for laying a heated asphalt mixture in a desired thickness on an unpaved surface.

[0002]

2. Description of the Related Art FIGS. 1 and 2 are a plan view and a side view of a general asphalt finisher. In front of the body 1 which moves by wheels along the unpaved surface, is a hopper 2 for storing heated asphalt. To the hopper 2, the heated asphalt mixture is supplied from the outside of the asphalt finisher. The asphalt mix of hopper 2 is
It is conveyed backward by the conveying device 3 of the asphalt mixture supplying means and is supplied onto the unpaved surface. The asphalt mixture is spread by the spreader 4 installed at the rear of the main body 1.
It is expanded along the width direction of the unpaved surface that is orthogonal to the traveling direction of the main body 1. Behind the spreader 4, there is provided a screed 5 which is a leveling means for leveling the asphalt mixture to a predetermined thickness.

The screed 5 is connected to the main body 1 via an arm 6. The arm 6 is attached to the body via a leveling cylinder 7 at the tip. The arm 6 is attached to the main body via a screed cylinder 8 at the rear end portion. A level roller 9 is provided in the middle of the arm 6. The level roller 9 is a device that has rollers at the lower end and support legs whose length can be adjusted. By extending and contracting the support legs of the level roller 9, the arm 6 can be swung to set the distance between the screed 5 and the unpaved surface to a desired constant value. If the tip end of the arm 6 is moved with respect to the main body by the leveling cylinder 7 with the level roller 9 set in an appropriate state as a fulcrum, the angle of the screed 5 with respect to the unpaved surface can be adjusted. . By swinging the arm 6 with the screed cylinder 8, the position of the spreading and leveling means with respect to the unpaved surface can be arbitrarily set.

[0004]

In the case of an ordinary asphalt mixture used for paving roads for general roads, it is 140-
It is shipped at a relatively low temperature of 170 ° C. for paving. In the case of laying out such an ordinary asphalt mixture, the conventional asphalt finisher described above is used and adjustment is not performed by the screed cylinder 8 while the screed 5 is floated on the asphalt mixture. We are paving.

However, an asphalt mixture used for pavement such as a highway where durability is required, for example, a goose asphalt mixture or a mastic asphalt mixture having a temperature of about 220 to 260 ° C. at the time of laying it. When used, the above-mentioned asphalt finisher could not be laid evenly. This is because the goose asphalt mixture has a relatively low viscosity at high temperature when it is laid, so it is easy to spread thinly, and the desired pavement thickness can be achieved with conventional equipment that performs paving while floating the screed on the asphalt mixture. It was difficult.

Therefore, conventionally, the arm 6 of the screed 5 is used.
As described above, the level roller 9 is provided in the middle portion of the above so as to keep the distance between the screed 5 and the unpaved surface constant. However, this conventional level roller 9 has a problem that it takes a long time for adjustment because the screw shaft is manually rotated to adjust the length. For example, the unpaved surface of the road has seams at predetermined intervals, and a connecting pin projects upward at this seam. When the asphalt finisher under paving crossed this seam, it was necessary to lift the screed 5 each time so that the screed 5 did not get caught on the pin. For that purpose, it is necessary to lengthen the height of the level roller 9, but the work is very complicated with the conventional human power adjusting mechanism. The situation is the same when avoiding other obstacles on the unpaved surface.

An object of the present invention is to provide an asphalt finisher capable of handling a high-viscosity asphalt mixture having high viscosity such as goose asphalt mixture. Specifically, the first purpose is to provide an asphalt finisher that can quickly adjust the level roller, and to spread evenly viscous or highly fluid asphalt mixture on an unpaved surface. A second object is to provide an asphalt finisher capable of adjusting a screed cylinder and a leveling cylinder for adjusting the position of the screed.

[0008]

An asphalt finisher according to claim 1 is a movable main body, and an asphalt mixture supply means provided on the main body for supplying an asphalt mixture onto an unpaved surface. An arm whose front end is attached to the main body so that it can be swung, and an asphalt mixture that is provided at the rear end of the arm and supplied to the unpaved surface are spread evenly to a predetermined thickness. In an asphalt finisher having a leveling means and a level roller that is provided in the arm to set the distance between the spreading and leveling means and the unpaved surface and rolls in contact with the unpaved surface, the level roller is A driving source fixed to the arm and rotating; a male screw connected to the driving source to rotate; and a female screw engaged with the male screw. A roller which to move vertically,
It is characterized in that it has drive means provided on the arm for moving the roller in the vertical direction.

The asphalt finisher according to a second aspect of the present invention is the asphalt finisher according to the first aspect, wherein the tip end of the arm is moved with respect to the main body with the level roller as a fulcrum. A leveling cylinder that adjusts an angle with respect to the unpaved surface; and a screed cylinder that sets the distance between the paving means and the unpaved surface by swinging the arm, and further has the leveling cylinder. It is characterized by having position adjusting means for operating the at least one of the screed cylinders to adjust the position of the spreading and leveling means.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described with reference to FIGS.
The characteristic portion will be described with reference to FIGS. It should be noted that detailed description of portions having substantially the same configuration as the conventional asphalt finisher described with reference to FIGS. 1 and 2 will be omitted except for the portions necessary for the description of the characteristic portions. For example, a main body 1 that moves on an unpaved surface, a conveying device 3 provided on the main body 1 as an asphalt mixture supplying means for supplying an asphalt mixture to the unpaved surface, and an asphalt supplied on the unpaved surface are predetermined. A screed 5 as a leveling means provided on the main body 1
The arm 6, the leveling cylinder 7, the screed cylinder 8 and the like for attaching the screed 5 to the main body have the same structure as the conventional general asphalt finisher and the asphalt finisher of this example.

As shown in FIG. 3, the screed 5 is attached to the rear end of the arm 6 attached to the main body at the tip end side. A level roller 10 for supporting the arm 6 on the unpaved surface is provided in front of the spreader 4 provided at the rear portion of the main body 1 at a substantially middle portion of the arm 6.

The structure of the level roller 10 will be described with reference to FIG. The level roller 10 includes a pair of left and right arms 6,6
Are provided respectively. A holding bracket 11 is fixed to the arm 6. A cylindrical outer tube 12 is attached to the holding bracket 11 so as to be movable in the vertical direction. A hydraulic motor 13 as a drive source is fixed vertically downward to the upper end of the outer tube 12. In the outer pipe 12, a screw rod 14 which is a screw is connected to the rotary shaft of the hydraulic motor 13 via a coupling. Inside the outer tube 12, a cylindrical inner tube 15 is slidably inserted in the vertical direction. A nut portion 16 as an internal thread is provided on the upper end of the inner pipe 15. The threaded rod 14 of the outer tube 12 is engaged with the nut portion 16 of the inner tube 15. At the lower end of the inner pipe 15, the roller 1 that contacts the unpaved surface
7 is rotatably provided.

A rear end of a hydraulic cylinder 18 as a driving means is connected to the arm 6 via a pin. The tip of the rod of the hydraulic cylinder 18 is connected to the lower end of the outer tube 12 via a pin.

A guide groove 19 is formed near the lower end of the inner pipe 15 along the vertical direction. A bolt 20 as a guide protrusion is provided near the lower end of the outer pipe 12 to guide the guide groove 1
It engages with 9 so that relative movement is possible. A guide groove 21 is formed in a substantially central portion of the outer tube 12 along the vertical direction. A bolt 22 as a stopper member is provided on the holding bracket 11 and engages with the guide groove 21 so as to be relatively movable.

FIG. 5 is a hydraulic circuit diagram of the hydraulic motor 13 and the hydraulic cylinder 18. This hydraulic circuit is provided for each of the pair of level rollers 10, 10. The switching valve A of the hydraulic cylinder 18 and the switching valve C of the hydraulic motor 13 are connected to the switching valve A connected to the hydraulic power source. By switching the switching valve A, hydraulic pressure is supplied to either the hydraulic motor 13 or the hydraulic cylinder 18. By operating the switching valve B, the operation of the hydraulic cylinder 18 can be selected from push, pull, and stop. By operating the switching valve C, the operation of the hydraulic motor 13 can be selected from forward rotation, reverse rotation, and stop.
The switching valves A, B, C are controlled by an electric circuit to combine the operations.

In controlling the level roller 10,
The drive amounts of the hydraulic cylinder 18 and the hydraulic motor 13 can be arbitrarily controlled. In addition, the position of the screed 5 suitable for the type of asphalt mixture to be used, construction conditions, etc. is stored in the storage means of the control device, and the position control of the level roller 10 is automatically performed by inputting various construction conditions. You may want to be told.

The operation of the above configuration will be described. This example is suitable for paving a relatively flat unpaved surface. The asphalt mixture having a predetermined temperature is supplied to the hopper 2 of the main body 1, conveyed from the hopper 2 to the rear of the main body 1, and then spread on the unpaved surface by the spreader 4 to be supplied onto the unpaved surface. It The screed 5 is set at a position in the same direction according to the width of the unpaved surface, and the asphalt mixture is spread by the screed 5 on the unpaved surface to a predetermined thickness.

When laying an asphalt mixture having a relatively low viscosity at high temperature during laying, for example, goose asphalt mixture, the screed 5 is placed on the asphalt mixture supplied on the unpaved surface as in the conventional case. Since it cannot be floated, the laying thickness of the asphalt mixture cannot be set to a desired constant value. In this example, in the level roller 10, the position of the outer tube 12 with respect to the arm 6 and the position of the inner tube 15 with respect to the outer tube 12 are set to adjust the position of the roller 17. As a result, the height of the arm 6 with respect to the unpaved surface is adjusted, and the distance between the screed 5 attached to the rear end of the arm 6 and the unpaved surface is set to a desired value. Therefore, even an asphalt mixture having low viscosity and in which the screed 5 cannot be floated can be laid in a desired thickness.

The position of the level roller 10 is adjusted by the outer tube 12
And a coarse movement operation in which the inner pipe 15 and the roller 17 connected thereto are rapidly moved by the hydraulic cylinder 18, and the inner pipe 15 and the roller 17 are moved to the outer pipe 12 by the hydraulic motor 1.
3 and a fine movement operation by moving the screw rod 14 or the like. Depending on the position of the roller 17,
In some cases it may be sufficient to perform only slight movements. If the adjustment range is large, the roller 17 may be roughly moved by the hydraulic cylinder 18, and then the position of the roller 17 may be finely adjusted by the hydraulic motor 13.

A case where the level roller 10 is adjusted by using both the hydraulic cylinder 18 and the hydraulic motor 13 will be described. When adjusting the level roller 10, the operator operates the hydraulic circuit shown in FIG. 5 by an electric operation from the driver's seat. The switching valve A switches the hydraulic pressure to the switching valve B, and the switching valve B operates the hydraulic cylinder 18 in the required direction by the required switching operation.
When the hydraulic cylinder 18 operates, the outer pipe 12 slides with respect to the holding bracket 11 of the arm 6 together with the inner pipe 15 and the roller 17. When the position of the outer pipe 12 is set, the switching valve A switches the hydraulic pressure to the switching valve C.
The hydraulic motor 13 rotates in the required direction, and the screw rod 14 that meshes with the nut portion 16 of the inner pipe 15 rotates. Since the inner tube 15 is prevented from rotating in the rotational direction with respect to the outer tube 12,
The inner pipe 15 slides in the vertical direction with respect to the outer pipe 12 as the screw rod 14 rotates. Compared to the movement of the outer pipe 12 by the hydraulic cylinder 18, the rotation of the screw rod 14 and the movement of the inner pipe 15 by the nut portion 16 have a low speed, and it is easy to adjust a fine position.

When the asphalt finisher is paving an unpaved surface and encounters a seam of a road,
If necessary, the position of the arm 6 is adjusted to raise the screed 5 to avoid contact between the screed 5 and a road joint or the like. Examples of such obstacles include seams provided at predetermined intervals on the unpaved surface of the road, finger joints on the upper unpaved surface of the iron bridge, and obstacles such as manholes on the unpaved surface of the road. There is. When the asphalt finisher encounters these, the hydraulic cylinder 18 is promptly operated in the extension direction to raise the position of the arm 6, and the clearance between the screed 5 and the road surface is increased to avoid the obstacle. The operation by the hydraulic cylinder 18 is quick and much more efficient than the conventional manual level adjustment. After overcoming obstacles, hydraulic cylinder 18
Are reversely operated to restore the state of the level roller 10 to the original state.

A second embodiment of the present invention will be described. The apparatus of this example has the configuration described with reference to FIGS. 1 to 5, but further includes means for adjusting the screed position by moving both the leveling cylinder 7 and the screed cylinder 8 up and down. There is. This example is suitable for an uneven paved surface which is difficult to deal with only by the level roller 10. This example, like the first example, is suitable for paving work using a fluid asphalt mixture.

The characteristic part of this example will be described with reference to FIG. As shown in FIG. 6, a leveling cylinder 7 and a screed cylinder 8 are connected to a switching valve D connected to a hydraulic power source (not shown) via a synchronize cylinder 30. By operating the switching valve D, the leveling cylinder 7 and the screed cylinder 8 simultaneously operate in the same direction. The position of the screed can be finely adjusted according to the unevenness of the unpaved surface. Further, since the leveling cylinder 7 and the screed cylinder 8 are simultaneously moved up and down, the angle of the screed 5 with respect to the unpaved surface (attack angle).
The height of the screed 5 can be adjusted while keeping constant.

A third embodiment of the present invention will be described. The apparatus of this example has the configuration described with reference to FIGS. 1 to 5, but further includes means for adjusting the screed position by moving only the screed cylinder 8 up and down. This example is suitable for an uneven paved surface which is difficult to deal with only by the level roller 10. This example, like the first example, is suitable for paving work using a fluid asphalt mixture. In this example, the leveling cylinder 7 is locked.

A fourth embodiment of the present invention will be described. The apparatus of this example has the configuration described with reference to FIGS. 1 to 5, but further includes means for adjusting the screed position by moving only the leveling cylinder 7 up and down. This example is suitable for an uneven paved surface which is difficult to deal with only by the level roller 10. This example, like the first example, is suitable for paving work using a fluid asphalt mixture. In this example, the position of the level roller 10 is adjusted in advance, and the screed position is adjusted by moving the arm 6 up and down by the operation of the leveling cylinder 7 using the position as a fulcrum. The screed cylinder 8 is in a free state.

[0026]

According to the asphalt finisher of the present invention, the distance between the leveling means and the unpaved surface can be arbitrarily set and can be easily changed depending on the construction conditions. It is possible to perform paving work with a specified pavement thickness using asphalt mixture that has high fluidity and is handled at high temperatures such as timber, and is efficient even when there are obstacles on uneven paved or unpaved surfaces. The effect is that good paving work can be performed.

[Brief description of drawings]

FIG. 1 is a plan view of a general asphalt finisher.

FIG. 2 is a front view of a general asphalt finisher.

FIG. 3 is an enlarged front view around the screed according to the embodiment of the present invention.

FIG. 4 is a level roller 1 according to an embodiment of the present invention.
0 is an enlarged sectional view of FIG.

FIG. 5 is a level roller 1 according to the embodiment of the present invention.
It is a hydraulic circuit diagram of 0.

FIG. 6 is a hydraulic circuit diagram of the leveling cylinder 7 and the screed cylinder 8 in the embodiment of the present invention.

[Explanation of symbols]

 1 main body 3 conveying device as asphalt mixture supplying means 5 screed 6 as leveling means 6 arm 7 leveling cylinder 8 screed cylinder 10 level roller 13 hydraulic motor as drive source 14 threaded rod as male thread 16 as female thread Nut part 17 Roller 18 Hydraulic cylinder as drive means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirokazu Watanabe 1-9-3 Kamatahonmachi, Ota-ku, Tokyo Inside Niigata Construction Machinery Co., Ltd. (72) Inventor Isahiro Sasa 730, Gunma-gun, Gunma-gun Munetaka Niigata Construction Machinery Co., Ltd. (72) Inventor Toshihiro Nagura 2 Nihonbashi Hakozakicho, Chuo-ku, Tokyo 2 Stock Company Nagura Manufacturing (72) Inventor Hideo Matsubashi 27 Nihonbashi Hakozaki-cho, Chuo-ku, Tokyo 2 Stock Company Nagura Inside the factory

Claims (2)

[Claims] 1. A movable main body, an asphalt mixture supplying means provided on the main body for supplying an asphalt mixture onto an unpaved surface, and a tip end portion attached to the main body so as to be swingable. Between the arm and the paving means for paving the asphalt mixture provided on the unpaved surface provided at the rear end of the arm to a predetermined thickness, and the paving means and the paved surface An asphalt finisher comprising a level roller provided on the arm for setting a distance and rolling in contact with the unpaved surface, wherein the level roller is fixed to the arm and rotates, and the drive source. A male screw that is connected to the source and rotates,
It has a female screw that meshes with the male screw, and has a roller that moves vertically with respect to the arm as the male screw rotates, and drive means that is provided on the arm and moves the roller vertically. Asphalt finisher. 2. A leveling cylinder that adjusts an angle of the spreading and leveling means with respect to the unpaved surface by moving a tip end portion of the arm with respect to the main body with the level roller as a fulcrum, and the arm is rocked. The asphalt finisher according to claim 1, further comprising: the spreading means and the screed cylinder that sets the distance between the unpaved surfaces by operating at least one of the leveling cylinder and the screed cylinder. An asphalt finisher having position adjusting means for adjusting the position of the leveling means.