JPS6016525B2 - asphalt finisher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an asphalt finisher, particularly to an improvement in a screed portion for leveling an asphalt mixture.

Generally, the screed part of an asphalt finisher consists of a strike-off plate attached to a deflector plate, a tamper, and a screed, and these are arranged so that their lower end surfaces (asphalt pressure surfaces) are approximately equal to each other. The asphalt mixture is conveyed from a hopper to a bar conveyor and spread to a predetermined width with a screw auger, and is compressed and leveled to a uniform thickness. The asphalt mixture used for pavement is a wear-resistant asphalt mixture because spiked tires or chains are used, but compared to ordinary asphalt mixtures, this wear-resistant asphalt mixture has less asphalt mixed in. Large quantity and strong viscosity.

However, in the conventional asphalt finisher, the screed part has a strike-off plate 1 as shown in Fig. 2.
A tamper 16 is disposed between the screed 9 and the tamper 16, and the tamper 16 is rotated by an eccentric shaft 7 by a drive device 6.
Since the asphalt mixture 4 is installed in a vibration generating device such as the above, and is applied with vertical vibration to compress the asphalt mixture 4 spread in the width direction, it is difficult to secure a large area under the tamper, and it is inevitable that Therefore, the surface pressure of the face must be increased, which may cause the generation of craters due to slack and insufficient density, and the formation of sand on the sliding surfaces of the tamper 16, the strike-off plate 15, and the screed 9, and on the tamper edge. There are problems such as accelerating abrasion of the bog running surface due to loose aggregates being caught, and causing scratches on the paved surface.Furthermore, the strike-off plate 15 and the screed 9 are separated by the tamper 16.
Heat from the screed part is not sufficiently transmitted to the strike-off plate 15, and material (asphalt mixture) adheres to the strike-off plate 15 and tamper 16, causing scratches, etc. (cracks, surface scratches, etc.) on the leveled surface (paved surface). ) are also likely to occur and cause pavement troubles.

This invention has been made to solve the above-mentioned drawbacks, and by integrally configuring the gusset bar and the strike-off plate, the entire surface of the tamper can be expanded substantially, and the screed and the strike-off plate can be separated from each other. The above-mentioned problems are solved by configuring the screed so that the heat within the screed is sufficiently transferred to the strike-off plate.

The following will explain the embodiments shown in the drawings.

Reference numeral 1 denotes an asphalt finisher main body, and 2 a hopper, which is attached to the front of the main body 1 and receives an asphalt mixture 4 from a dump truck 3 or the like.

Reference numeral 5 denotes a screed portion, which is composed of a strike-off plate/tamper 8 mounted on an eccentric shaft 7 rotated by a drive device 6 such as a hydraulic motor, and a screed 9 mounted on the tamper 8. , and the strike-off plate and tamper 8 and the screed 9 have through holes 10, 10.
It is passed through the lotus through '...'.

Since the eccentric shaft 7 is used as a strike-off plate and tamper 8, the cross-sectional area (lower end surface) of the tamper is substantially doubled and the weight is also doubled.
/2 (approximately 1 skin) to avoid an increase in the amount of work and to prevent the cut amount of the asphalt mixture from becoming uneven due to the vertical vibration of the Suilike-off plate.

1 1 The deflector plate 12 attached to the main body 1 side of the strike-o-77 plate/tamper 8 is a heating device such as a propane burner.

13 is a bar conveyor for conveying the asphalt mixture 4 from the hopper 2 to the front of the screed section 5, and 14 is a screw auger for spreading the asphalt mixture 4 conveyed by the bar conveyor 13 in the width direction.

This invention has the above-mentioned configuration, and the asphalt mixture sent from the hopper 2 to the screw auger 14 via the bar conveyor 13 is spread in the width direction by the screw auger 14, reaches the screed part 5, and is moved to the strike-off plate and tamper 8. After being cut to a uniform thickness (ΔX) and subjected to cross-pressure, it is finished with a screed 9.

As described above, according to the present invention, since the traverse pressure is applied by the strike-off plate and tamper, it is possible to lower the traverse surface pressure compared to the face pressure by the conventional tamper.
Cracks do not occur on the pavement surface.

In addition, the sliding surface is only the joint surface between the strike-off plate and tamper and the screed, and the vertical vibration stroke is also short, so the asphalt mixture is cut uniformly, and the biting of sand and aggregate is reduced. There is hardly any catching or the like.

Furthermore, as the strike-off plate and tamper move between the screed and the screed, the heat of the screed portion is sufficiently transferred to the tamper side and is heated and kept warm, so that the asphalt mixture is cooled and does not stick to the screed.

[Brief explanation of drawings]

Figure 1 is a schematic side view of the asphalt finisher, Figure 2 is a schematic side view of the asphalt finisher.
The figure is a partially cut-out side view of a conventional screed part, and FIG. 3 is a partially cut-out side view of the screed part of the present invention. 5 screed part, 7: eccentric shaft, 8: strike-off plate and tamper, 9: screed, 10, 10' three through holes, 15: strike-off plate, 16: tamper. Figure 1: Line 2: Figure 3:

Claims (1)

[Claims] 1. A strike-off in which the strike-off plate and tamper of the asphalt finish screed part are integrally constructed, and these are communicated with the screed through a through hole, and the strike-off is integrally constructed. An asphalt finisher characterized by a plate and a tamper connected to a vibration generator such as an eccentric shaft.