JPS6215290Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a leveling device such as an asphalt finisher or base paver used for road paving.

As is well known, in an asphalt finisher, as shown in FIG. 1, asphalt composite material (hereinafter abbreviated as composite material) is fed into a hopper 2 by a dump truck or the like and is fed to a bar feeder 3 while a traveling vehicle body 1 is running. It is sent to the rear screw conveyor 4, which spreads it evenly left and right, and it is spread flat with a screed 5.

By the way, when using the conventional asphalt finisher mentioned above to level the composite material on the road surface, the composite material was not laid evenly and holes were left in places on the road surface where the composite material had already been laid. There are often. Naturally, the occurrence of such holes must be suppressed, and in order to find out the cause of the occurrence of these holes, the inventor investigated details such as the operating conditions of the screed 5 and the screw conveyor 4, etc., and the supply status and properties of the mixed material. I investigated, but could not find the cause. However, as a result of a long-term investigation, it was found that a bridge of the composite material was actually formed between the rear frame 6 of the traveling vehicle body 1 and the screw conveyor 4, which appeared to be flowing smoothly from the outside. It was discovered that this was the cause of the formation of the holes mentioned above.

The present invention was developed based on the above background, in which a predetermined portion of the rear frame of a traveling vehicle body is formed to be inclined toward the front side of the traveling vehicle body, and a composite material is bridged between the rear frame and the screw conveyor. To provide a leveling device such as an asphalt finisher, which can prevent the above and proceed with paving work smoothly.

The present invention will be explained below based on the drawings.

2 to 4 show an embodiment of the present invention, in which the screw conveyor 4 is attached to the rear frame 6 of the traveling vehicle body 2 via a support member 7 at a predetermined distance, as in the conventional case. They are arranged along the width direction of the traveling vehicle body 2 at intervals and at a predetermined interval from the road surface, and the mixed material is supplied from the hopper 2 to the center of this screw conveyor 4 by a bar feeder 3. The screws are conveyed to both sides of the traveling vehicle body 2 by the rotating action of the screw conveyor 4, and are uniformly spread out on the road surface.

Further, an opening 6a for supplying the composite material is formed in the rear frame 6 over the width of the supply of composite material by the bar feeder 3, and a sprocket wheel of the bar feeder 3 is disposed outside of this opening 6a. The inner side 6b of the rear frame 6 is vertically formed from the upper end to the lower end as in the conventional case, and the outer side 6c of the rear frame 6 located outside the inner side 6b extends from the upper end to the screw conveyor 4. A predetermined height above the rotation center height, preferably approximately 1/1/2 of the radius of the screw conveyor 4.
The running vehicle body 1 extends vertically from the predetermined height position (lower end position of the vertical portion) above the rotation center height of the screw conveyor 4 to the lower end of the rear frame 6. The outer portion 6c is formed to be inclined at a predetermined angle θ toward the front side, and the length of the outer portion 6c in the vertical direction is slightly shorter than the inner portion 6b.

Here, it is preferable that the inclination angle θ of the lower part of the outer portion 6c is approximately the angle of repose of the composite material spread on the road surface. Further, a side plate 6d is provided between the inclined portion of the outer portion 6c and the end surface of the inner portion 6b to close the gap therebetween.

Next, the operation of the present invention will be explained.

When paving a road with asphalt using the asphalt finisher of the present invention, as in the past, the mixture is fed from the hopper 2 to the center of the screw conveyor 4 by the bar feeder 3 while the traveling vehicle body 2 is running at a predetermined speed. The mixed material is fed laterally by the screw conveyor 4 and spread uniformly on the road surface. Then, this composite material is spread on the road surface with a predetermined compaction using a screed 5. At this time, in the asphalt finisher of the present invention, the lower part of the outer part 6c of the rear frame 6 is inclined at a predetermined angle θ toward the front side of the traveling vehicle body 1, so that the rear frame 6 and the screw conveyor 4 are connected to each other. Since a sufficient distance is maintained, the conventional problem of bridging of the composite material between the rear frame 6 and the screw conveyor 4 is eliminated, and the paving work can proceed smoothly.

Incidentally, in the above, the lower part of the outer part 6c of the rear frame 6 is inclined at a predetermined angle θ, but if there is a sufficient distance between the outer part 6c and the screw conveyor 4, it can be bent, for example, in a curved state. It does not matter if it is tilted. However, simply widening the distance between the rear frame 6 and the screw conveyor 4 without tilting a predetermined lower portion of the outer portion 6c toward the front side of the vehicle body 1 is as follows:
Heavy objects such as the screed 5 disposed at the rear of the traveling vehicle body 1 via the support arm will be positioned further rearward, which is undesirable since it will cause problems in terms of overall weight balance.

As described above, according to the present invention, the composite material is not bridged between the rear frame and the screw conveyor, and therefore the work of laying the composite material can proceed smoothly and without defects. It is possible to provide a leveling device such as an asphalt finisher that can obtain a paved road surface.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional asphalt finisher, Figs. 2 to 4 show an embodiment of the present invention, Fig. 2 is a front view of the main parts, and Fig. 3 is Figure 4 is the - arrow view of Figure 3.
It is an arrow view. 1... Traveling vehicle body, 4... Screw conveyor, 6
... Rear frame, 6c ... Outer part.

Claims (1)

[Scope of utility model registration request] In a leveling device such as an asphalt finisher, which is equipped with a screw conveyor that spreads the asphalt mixture onto the road surface behind the rear frame of the running vehicle, a part of the rear frame is located at the center of rotation of the screw conveyor. A leveling device for an asphalt finisher or the like, characterized in that the leveling device is formed so as to be inclined toward the front side of a traveling vehicle body in a range extending from a position above the roadway to a lower end.