JPH11131419A - Leveling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leveling machine having a screed plate in which a mix can be uniformly leveled by the screed plate, the regulating work is easy, compared with a conventional one, and a beautiful finished surface can be formed. SOLUTION: An asphalt mix laid on a road surface is leveled while being pressed by a heated screed plate. In this case, the front surface of a screed plate 7A (7B) is provided with an inclined part 7a having an inclined sweep-back angle to the lateral direction of a leveling machine in the direction situated in the rear side of the leveling machine toward the sides of the screed plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leveling machine having a screed plate (bottom plate) such as an asphalt finisher, a repaver and a remixer used for leveling an asphalt mixture in asphalt pavement work.

[0002]

2. Description of the Related Art An asphalt finisher, which is an example of a leveling machine used for asphalt pavement work, will be described with reference to FIG. As shown in FIG. 4, a screed device 60 is provided on the rear side of the asphalt finisher 1 (see FIG. 1) via a support arm 50 by a pull point 51. The screed device 60
Is a main screed plate 53 and a telescopic screed plate 54 provided behind the screed plate 53.
By adjusting the thickness control 55 provided over the support arm 50 and the upper end side of the main screed plate 54, the road surface is rotated around the screed pivot point 52 of the support arm 50 and spread. The so-called attack angle φ is adjusted.

[0003] For this reason, while driving a crawler or a wheel to travel in the direction of arrow a, an asphalt mixture (hereinafter, referred to as a mixture), which is a heated mixture, charged into a hopper device is fed to a bar feeder device (see FIG. 1). To the rear auger device 57, and the auger device 57 uniformly spreads the mixture over the width, which is the left and right working width. Then, the spread mixture is flattened on the road surface by the main screed plate 53 of the screed device 60 suspended behind the support arm 50 and the telescopic screed plate 54 expanded and contracted by a hydraulic cylinder on the left and right sides of the main screed plate 53. At the same time, the spread mixture is compacted by the vibrator device 56 provided in the screed device 60 to be formed into a predetermined width and a predetermined thickness.

The main screed plate 53 of the screed device 60 for the asphalt finisher described above.
In order to spread the mixture spread by the auger device 57 with a predetermined thickness, the road surface contact portion is formed in a direction perpendicular to the traveling direction. Therefore, when the resistance that the mixture pushes up the main screed plate and the force with which the main screed plate presses the mixture are balanced, the mixture is accurately spread at a certain height. .

[0005]

However, according to the construction of the conventional spreading machine, the screed plate is formed in a direction orthogonal to the traveling direction, so that the screed plate abuts on the screed plate. The resistance of the mixture was large, and it was difficult to adjust the mixture to spread it evenly, resulting in cases where it was not possible to form a clean finished surface.

If the amount of the mixture sent to the screed plate is not uniform, it is difficult to spread the mixture uniformly with a screed plate formed in a direction perpendicular to the traveling direction. And adversely affected the finished surface.

Further, since the screed plate is supported in the direction of always pressing the mixture and is in contact with the mixture, the screed plate is liable to be distorted.
In addition, the load on the pull point or the screed pivot point, which is an adjustment part of the screed plate, increases. Therefore, if the screed plate is distorted and the joints such as the pull point are severely worn, it will be difficult to adjust the screed plate to evenly spread the mixture, especially if the screed plate is perpendicular to the direction of travel. If the screed plate is formed in such a direction, the resistance from the mixed material is large, so that the insufficient adjustment of the screed plate greatly affects the finished surface.

The present invention solves the above-mentioned problems of the conventional screed plate, allows the mixture to be spread evenly by the screed plate, and the adjustment work is easier than the conventional one. An object of the present invention is to provide a leveling machine capable of forming a clean finished surface.

[0009]

In order to achieve the above object, according to the present invention, there is provided a spread leveling machine for spreading and spreading an asphalt mixture spread on a road surface while pressing the same with a heated screed plate. The front of the plate, towards the side of the screed plate,
The laying machine is configured as a laying machine having a sloping portion that makes an inclined receding angle with respect to a lateral direction of the laying machine in a direction located on the rear side of the laying machine.

The inclined portion of the screed plate may be configured to form a receding angle from the center of the screed plate toward both sides of the screed plate, and the inclined portion may have an inclined angle of 5 degrees. To 10 degrees.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view showing the entire asphalt finisher, FIG. 2 is a side view of the asphalt finisher, FIG. 3A is a plan view showing a main part of the screed plate, and FIG. 3B is a screed plate. FIG. 4 is a principle view showing a state of a mixture material spread and spread.

As shown in FIGS. 1 and 2, the asphalt finisher 1 drives a drive unit such as a wheel 8 (crawler) to move the vehicle body 2 and, at the same time, feed the mixture put into the hopper 3 to a bar feeder device. 4 to the auger device 5 at the rear, and uniformly diffused by the auger device 5,
The mixture is spread evenly on the road surface by a screed device 7 suspended behind the support arm 6, and the spread mixture is compacted by a vibrator 9, and the mixture is formed to a predetermined width and a predetermined thickness. It is constituted so that it may be molded into.

The screed device 7 comprises a main screed plate 7A, a telescopic screed plate 7B provided behind the main screed plate 7A, and the like.
Included are inclined portions 7a, 7a which form an inclined receding angle with respect to the lateral direction of the asphalt finisher 1 in a direction located behind the asphalt finisher 1 from the center of the main screed plate 7A toward both sides. doing.

The inclined portion is formed symmetrically with respect to the center top 7b, and is configured such that the inclination angle θ is in the range of 5 to 10 degrees.

If the inclination angle of the inclined portion 7a is smaller than 5 degrees, the resistance from the mixture increases, and the inclined portion 7a
It would be inconvenient to spread it smoothly along the sloped part. In addition, if the inclination angle of the inclined portion 7a is larger than 10 degrees, it is necessary to improve other parts when laying the mixture, so that the angle is set in the range of 5 degrees to 10 degrees.

Therefore, the main screed plate 7
In the case where the asphalt finisher 1 provided with A is used to spread the mixture, the following operation is performed. When the mixture is sent to the inclined portion 7a side of the main screed plate 7A by the bar feeder device 4 or the auger device 5, FIG.
The operation as shown in FIG. That is, the inclined portion 7a
Exerts a force on the composite material in the direction of the composite force direction α between the rectilinear direction x and the orthogonal direction y depending on the inclination angle of the inclined portion 7a.

Therefore, the mixture sent to the inclined portion 7a smoothly moves from the top 7b of the main screed plate 7A to the left and right outside along the inclination angle of the inclined portion 7a, while moving the main screed plate 7A. Is smoothed only underneath, and spread evenly.

Therefore, the mixed material spread evenly by the main screed plate 7A is compacted by the telescopic screed plate 7B and the vibrator 9, and can be formed into a clean finished surface.

The inclination angle of the inclined portion may be changed according to conditions such as the type of the mixture spread on the road surface and the thickness of the mixture spread. Further, it is convenient that the inclined portion is provided on both the main screed plate and the extendable screed plate. Further, the inclined portion may be formed from one end to the other end of the main screed plate (a configuration in which the inclined portion becomes one place). Further, the inclined portion is formed linearly, but may be formed with a gentle curve.

[0020]

As described above, according to the spreading machine having the screed plate according to the present invention, the front surface of the screed plate moves toward the side of the screed plate. In the direction located on the rear side, since there is an inclined portion that forms an inclined receding angle with respect to the lateral direction of the spreading machine, the mixture sent to the screed plate follows the inclined portion of the screed plate. Since the surfaces of the mixture spread by the screed plate can be formed uniformly, a beautiful finished surface can be formed.

[0021] In addition, in the spread leveling machine, the slope of the screed plate is formed at the road surface contact portion, so that the flow of the mixture becomes smooth, the resistance from the mixture to the screed plate is reduced, and the screed plate is reduced. Causes such as distortion can be minimized.

Further, since the spreading machine can minimize the resistance of the mixture to the screed plate, the load on the joints such as the pull points supporting the screed plate can be reduced. At the same time, the attack angle can be easily adjusted.

[Brief description of the drawings]

FIG. 1 is a plan view showing the entire asphalt finisher of the present invention.

FIG. 2 is a side view of the asphalt finisher of the present invention.

FIG. 3 (a) is a plan view showing a main part of a screed plate of the present invention, and FIG. 3 (b) is a principle view showing a state of a composite material spread by the screed plate of the present invention.

FIG. 4 is a side view of a conventional screed plate.

[Description of Signs] 1 Asphalt finisher 2 Body 3 Hopper 4 Bar feeder device 5 Auger device 6 Support arm 7 Screed device 7A Main screed plate 7B Telescopic screed plate 7a Inclined portion 7b Top 8 Wheel 9 Vibrator

Claims (3)

[Claims] 1. A spread leveling machine that spreads an asphalt mixture spread on a road surface while pressing it with a heated screed plate.
The screed plate further includes an inclined portion that is inclined backward with respect to a lateral direction of the spreading machine in a direction located on a rear side of the spreading machine toward a side of the screed plate. Spreading machine. 2. The leveling machine according to claim 1, wherein the inclined portion of the screed plate has an inclined receding angle from the center of the screed plate toward both sides of the screed plate. 3. The inclined part has an inclination angle of 5 degrees to 1 degree.
3. The spreading machine according to claim 1, wherein the spreading machine is formed in a range of 0 degrees.