JPH1121810A - Speed expansion device of asphalt finisher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge the maximum paving width by making an auxiliary screed accommodated within the car width of an asphalt finisher movable through a simple operation to stretch plural sets of auxiliary screeds. SOLUTION: Two sets of auxiliary screeds 15, 16 are laterally movably attached to a main screed 14. The first cylinder 21 of a multistage telescopic cylinder 20 is fixed inside a main screed 14. The top part 22a of the second cylinder 22 of the multistage telescopic cylinder 20 is attached to the side part 15a of the first auxiliary screed 15, and the tip part 23a of the rod 23 of the second cylinder is attached to the side part 16a of the second auxiliary screed 16. When the multistage telescopic cylinder 20 is driven in the direction of stretching, the second cylinder 22 protrudes from the first cylinder 21 and the auxiliary screed 15 moves outward, and the rod 23 protrudes from the second cylinder 22 and the second auxiliary screed 16 moves outward. Thus the first and the second auxiliary screed 15, 16 move laterally outward to the main screed 14 to expand a paving width.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screed expansion and contraction device for an asphalt finisher, and more particularly to a screed expansion and contraction device for an asphalt finisher in which two or more sets of auxiliary screeds are stored within the width of a vehicle.

[0002]

2. Description of the Related Art As shown in FIGS. 4 and 5, a conventional screed expansion / contraction device for an asphalt finisher is provided with left and right auxiliary screeds 2 at a rear portion of a main screed 1. The auxiliary screed 2 is housed within the vehicle width as shown in FIG. 4, and the paving width can be changed by moving the auxiliary screed 2 in the left-right direction as shown by the solid line in FIG. The movement of the auxiliary screed 2 is performed by the operation of a hydraulic cylinder or the like (not shown).

However, since an overlapping portion with the main screed 1 is required, even when the auxiliary screed 2 is maximized, the entire width that can be paved is two times the width of the main screed 1.
Cannot exceed twice. For this reason, when it is desired to further increase the pavement width, the attachment screed 3 is attached to the side of the auxiliary screed 2 with bolts or the like, as shown by the two-dot chain line in FIG.

[0004]

In the conventional screed expansion and contraction device for an asphalt finisher, the attachment screed is tightened with a bolt or the like when the pavement width is to be further extended than the extension width of the auxiliary screed. Since the weight of the screed is heavy, it is difficult to attach and remove the screed, and there is a danger. In addition, since the adjustment after the attachment screed requires skill, a great deal of labor and time are required.

Further, the auxiliary screed should be at least
It is possible to expand the maximum pavement width by expanding and contracting the auxiliary screed in two or more stages by the operation of multiple hydraulic cylinders, but it is possible to arrange a single hydraulic cylinder separately for each auxiliary screed. Becomes complicated.

Therefore, there is a technical problem to be solved in order to make the auxiliary screed housed within the vehicle width of the asphalt finisher movable by a simple operation and to extend a plurality of sets of auxiliary screeds to increase the maximum pavement width. Therefore, the present invention aims to solve this problem.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, and comprises at least two sets of left and right auxiliary screeds with respect to a main screed, and an auxiliary screed housed within a vehicle width. In a screed expansion and contraction device for an asphalt finisher that can be moved to the left and right to change the pavement width, the first cylinder of a multistage telescopic cylinder is fixed to the main screed, and the innermost side is attached immediately before or immediately after the main screed. The intermediate cylinder of the multi-stage telescopic cylinder is sequentially mounted from the auxiliary screed to the outer auxiliary screed, and the rod end of the multi-stage telescopic cylinder is mounted on the outermost auxiliary screed, and the auxiliary is provided by the expansion and contraction of the multi-stage telescopic cylinder. Asphalt finisher screed configured to move screed left and right There is provided a condensation device.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. Figure 1 shows asphalt finisher 1
0, the asphalt filled in the hopper 11 is sent backward by the feeder conveyor 12, dropped on the road surface, and then spread in the left-right direction by the screw spreader 13. Furthermore, the main screed 14 and the left and right auxiliary screeds 1
At 5 and 16, the asphalt is compacted to a predetermined width and thickness.

As shown in FIG. 2, an innermost first auxiliary screed 15 is attached immediately after the main screed 14, and the first auxiliary screed 15 is formed so as to be movable in the left-right direction along the main screed 14. ing. Also, the first
Immediately after the auxiliary screed 15, the outermost second auxiliary screed 16 is attached.
Are formed so as to be movable in the left-right direction along the first auxiliary screed 15.

A multi-stage telescopic cylinder 20 is provided inside the main screed 14 and operates to expand and contract by electric or hydraulic pressure. In the present embodiment, a second cylinder 22 is provided as an intermediate cylinder inside the first cylinder 21, and the second cylinder 22 is expanded and contracted along with the expansion and contraction of the rod 23 of the second cylinder 22.
A stepwise expansion / contraction operation is performed. It should be noted that a multi-stage telescopic cylinder having three or more stages can be used according to the number of combinations of auxiliary screeds.

As shown in FIG. 1, the first cylinder 21 is fixedly mounted on the main screed 14 such that the ends of the second cylinder 22 and the rod 23 are directed to the left and right sides of the main screed 14.
The top part 22a of the second cylinder 22 is mounted on the side part 15a of the first auxiliary screed 15. Furthermore, this side part 1
The rod 23 of the second cylinder is projected out of the first auxiliary screed 15 through 5 a, and the tip 23 a of the rod 23 is attached to the side surface 16 a of the second auxiliary screed 16.

When the multistage telescopic cylinder 20 is driven in the extension direction by remote control from the driver's seat, the second cylinder 22 projects from the first cylinder 21 and the side surface 15a of the first auxiliary screed 15 is pressed. Then, the first auxiliary screed 15 moves outward with respect to the main screed 14. Further, the rod 23 projects from the second cylinder 22 to press the side surface portion 16 a of the second auxiliary screed 16, and the second auxiliary screed 16 is
Moves outward.

Accordingly, as shown in FIG. 3, the first auxiliary screed 15 and the second auxiliary screed 16 can move to the left and right outside with respect to the main screed 14 to expand the pavement width. Can be more than twice the width of In moving the auxiliary screed, the multi-stage telescopic cylinder 20 may be driven by remote control, which can be performed very easily without any trouble of the operator.

On the other hand, when the multi-stage telescopic cylinder 20 is driven in the contracting direction, the first cylinder 21 is moved to the second cylinder 22.
Is retracted, and the rod 2 is inserted into the second cylinder 22.
3 is drawn. Therefore, the first auxiliary screed 15 and the second auxiliary screed 16 move inward in the left and right directions with respect to the main screed 14, and the left and right auxiliary screeds 1 move within the vehicle width.
5, 16 can be stored.

Although not shown, each auxiliary screed may be provided in front of the main screed. In this case as well, by driving the multi-stage telescopic cylinder in the same manner as described above, each auxiliary screed moves in the left-right direction, and the overall width that can be paved is changed.

Thus, the present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0017]

As described above, in the present invention, since two or more sets of auxiliary screeds are movably mounted on the main screed, the maximum pavement width can be increased to twice or more the width of the main screed. it can. In addition, since the auxiliary screed is moved by driving the multi-stage telescopic cylinder by remote control, the expansion and contraction operation of the auxiliary screed can be performed extremely easily and at a high speed, and the labor when expanding the pavement width is reduced, and the danger is reduced. There is no need to work safely.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is a plan view of an asphalt finisher in which an auxiliary screed is stored.

FIG. 2 shows the embodiment of the present invention and is a plan view of a screed expansion / contraction device.

FIG. 3 is a plan view showing an operation state of the asphalt finisher of FIG. 1;

FIG. 4 is a plan view of a conventional asphalt finisher.

FIG. 5 is a plan view showing an operation state of a conventional asphalt finisher.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Asphalt finisher 14 Main screed 15 1st auxiliary screed 16 2nd auxiliary screed 20 Multi-stage telescopic cylinder 21 1st cylinder 22 2nd cylinder 23 Rod

Claims (1)

[Claims] 1. A screed expansion and contraction device for an asphalt finisher having at least two sets of left and right auxiliary screeds with respect to a main screed and capable of changing a pavement width by moving an auxiliary screed housed within a vehicle width in a left-right direction. Then, the first cylinder of the multistage telescopic cylinder is fixed to the main screed, and the intermediate cylinder of the multistage telescopic cylinder is sequentially mounted from the innermost auxiliary screed attached immediately before or immediately after the main screed to the outer auxiliary screed. The screed expansion and contraction of the asphalt finisher is characterized in that the rod end of the multi-stage telescopic cylinder is attached to the outermost auxiliary screed so that the auxiliary screed can be moved in the left-right direction by the expansion and contraction of the multi-stage telescopic cylinder. apparatus.