JP3247337B2 - Screed equipment for road paving machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road paving machine for paving a road surface by spreading an asphalt mixture with a screed, and more particularly to an expansion screed for expanding the range of spread of a main screed. The present invention relates to a screed device for a road paving machine having a screed.

[0002]

2. Description of the Related Art A conventional asphalt finisher as a road paving machine of this type generally uses an asphalt mixture (hereinafter referred to as "mixed material") filled in a hopper at a front part of the body by a feeder conveyor of the body to a rear end of the body. To the road surface from the rear end of the fuselage and spread to the left and right by the screw spreader arranged at the rear of the fuselage. It is configured so that it can be spread to a predetermined width and thickness.

As shown in FIG. 3A, the screed apparatus 1 includes a main screed 2 for laying a mixture to a predetermined width and thickness and paving a road surface. A pair of left and right telescopic screeds 3 are provided to extend the spread area of the main screed 2 substantially, and the telescopic screeds 3, 3 are connected to each other by a not-shown actuator such as a cylinder, a rack and a pinion. Move inward to adjust the spread range of the mix.

In this type of screed device, the spread range of the screed mixture, that is, the spread range of the width L of the main screed 2 and the total width L 'of the telescopic screed 3, is determined by the width of the road to be paved. Although it is desirable to make the determination based on the above, generally, the width is set to be less than the inner width of the truck bed for carrying by truck.

For this reason, the actual spread range of the screed device is at least approximately L for the width of one truck and at most 2 L for the width of two trucks. And
In the case where the screed pavement width is insufficient even in the screed device 1 as described above, as shown in FIGS. The expansion screeds 4 and 4 are arranged side by side, and the expansion screeds 4 and 4 are connected to the adjacent telescopic screeds 3 and 3 via hinges 5 and 5 so as to be foldable rearward in the traveling direction. Spreading using these extended screeds 4, 4 is performed.

Of course, these expanded screeds 4 and 4 are fixed to the adjacent telescopic screeds 3 and 3 by bolts 6 so as to prevent the extended screeds 4 and 4 from rotating freely due to the load of the composite material. .

[0007]

However, the expansion screed is heavy, and it takes a considerable amount of work to work alone by rotating the expansion screed to switch between the juxtaposed position and the folding position. On the other hand, if the screed device is inclined at a predetermined angle or more with respect to the horizontal plane, the extended screed may rotate by its own weight when the bolt is removed, and the worker may be pinched.

[0008] Further, the structure of connection by bolts requires time and labor corresponding to the number of bolt fastening points, requires special tools, and requires management corresponding to lost bolts. There is a problem that an extra burden is imposed.

Therefore, there arises a technical problem to be solved in order to be able to easily change the position of the expansion screed with respect to the telescopic screed, and the present invention aims to solve this problem. And

[0010]

DISCLOSURE OF THE INVENTION The present invention has been proposed to achieve the above object, and has a main screed for paving a road surface by spreading an asphalt mixture, and a left and right rear screed in a traveling direction of the main screed. A pair of telescoping screeds that substantially extend the spread area of the main screed, and are juxtaposed outside both ends of the telescoping screed, and hinged to the outer rear end of the telescoping screed. In a screed device for a road paver comprising a pair of left and right expansion screeds provided so as to be freely foldable and expandable, a folding link piece pivotally supported at a distal end portion at a rear portion of each of the corresponding telescopic screed and the expansion screed. Pivotally supporting the other end of one of the pieces, and mounting a cylinder on an inner portion of the telescopic screed, and connecting a cylinder rod of the cylinder to the folding ring. There is provided a screed device of a road paving machine forming that is pivotally supported on the pivot portion of the tip piece.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. The same components as those of the conventional example will be described using the same reference numerals.

In FIG. 1, reference numeral 9 denotes a screed device. The screed device 9 includes a main screed 2, a pair of telescopic screeds 3, 3 disposed on the left and right sides in the traveling direction of the main screed 2, and hinges 5 at the outer rear ends of the telescopic screeds 3, 3. 5 and a pair of left and right expansion screeds 4 and 4 which are provided so as to be foldable and extendable via a pair 5.

The main screed 2 is for paving a road surface by laying an asphalt mixture and flattening the road surface.
Reference numeral 4 denotes a structure which is capable of substantially expanding the spread area of the road surface.

The extended screeds 4, 4 are shown in FIG.
And as shown in FIG.
The base ends of the link pieces 6a, 6a are pivotally supported on the rear upper surfaces in the respective traveling directions, and the tip ends of the link pieces 6a, 6a are joined together. The folding links 6 and 6 are pivotally supported, respectively.

On the other hand, cylinders 8 and 8 are attached to the rear and inner ends of the telescopic screeds 3 and 3 respectively.
a, 8a to the link pins 7,
7 are each pivoting.

Therefore, as shown in FIG. 1, when the cylinders 8, 8 are reduced, the folding links 6, 6,
Are pivoted inward via pivotal support portions at their base ends, and left and right extended screeds 4, 4 pivotally supported by the folding links 6, 6 pivot the respective hinges 5, 5 around the pivots. The extended screeds 4, 4 overlap with the rear side surfaces of the telescopic screeds 3, 3 while rotating as shown in FIG. 2. Further, as shown in FIG. Extended screeds 4, 4 overlapping the rear sides of the screeds 3, 3 pivot outward via respective hinges 5, 5 and are linearly aligned with the outer sides of the telescopic screeds 3, 3. Will be.

When the expansion stroke is extended, the cylinders 8, 8 rotate to the position where the expansion screeds 4, 4 are arranged in series with respect to the expansion screeds 3, 3,
At the time of contraction, the expansion screeds 4, 4 are set so as to be able to rotate to the folded position by overlapping the expansion screeds 4, 4 with respect to the telescopic screeds 3, 3 in the traveling direction. Thus, the positions of the expansion screeds 4, 4 can be freely switched without requiring human power.

In this case, for example, telescopic screeds 3, 3
And the extension screeds 4, 4, and a cylinder is laid over the screeds 4, 4, and the position of the extension screeds 4, 4 is switched between the extended position and the folded position by expansion and contraction of the cylinder. The load on the cylinder 8 is reduced by the axle of the pivot portion of the link pieces 6a, 6a constituting the folding links 6, 6, and furthermore,
Since the expansion and contraction strokes of the cylinders 8 can be reduced, the cylinders 8 can be reduced in size and cost.

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.

[0020]

As described in detail in the above-described embodiment, the present invention provides a pair of left and right telescopic screeds which are respectively foldably and pivotally attached to the outer rear ends of the pair of right and left telescopic screeds via hinges. The expansion screed is configured to be able to be switched to either the folding position or the expansion position by the expansion and contraction operation of the cylinder via the folding link, so that the expansion screed can be freely switched without requiring human power. Therefore, the position of the expansion screed can be simply, quickly, and safely switched.

At this time, the expansion screed is switched by the expansion and contraction operation of the cylinder as described above. Since the switching is switched to one of the folding position and the expansion position via the folding link, The load is reduced by the axle of the pivot portion of the link piece constituting the folding link, and furthermore, the expansion and contraction stroke of the cylinder can be reduced, which can contribute to the miniaturization and cost reduction of the cylinder. .

[Brief description of the drawings]

FIG. 1 is a plan view showing a screed device for an asphalt finisher according to an embodiment of the present invention, in which an expanded screed is folded.

FIG. 2 is a plan view showing a state where the expansion screed of FIG. 1 is expanded.

FIG. 3A is an explanatory plan view showing a conventional screed device for an asphalt finisher. (B) An explanatory plan view showing a state where a conventional telescopic screed and expansion screed are expanded.

FIG. 4A is an explanatory plan view of a conventional screed device for an asphalt finisher. (B) An explanatory plan view showing a state where the expanded screed of FIG. 4 (A) is overlaid on a telescopic screed.

[Explanation of symbols]

 2 Main screed 3 Telescopic screed 4 Expansion screed 5 Hinge 6 Folding link 7 Link pin 8 Cylinder 9 Screed device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model 57-123810 (JP, U) Japanese Utility Model 6-20507 (JP, U) Japanese Utility Model 7-4509 (JP, U) Japanese Utility Model Sho 53- 8438 (JP, Y1) Jiko 56-47205 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) E01C 19/48

Claims (1)

(57) [Claims] 1. A main screed for paving a road surface by laying an asphalt mixture, and a telescopic screed disposed in a pair on the left and right sides behind the traveling direction of the main screed to substantially extend the spread area of the main screed. A screed device for a road paver comprising: a pair of left and right extended screeds arranged side by side at both ends of the telescopic screed and foldable and extendable via hinges at outer rear ends of the telescopic screed. In each of the corresponding telescopic screed and expansion screed, the other end of one of the folding link pieces whose front ends are pivotally supported is pivotally supported, and
A screed device for a road paving machine, wherein a cylinder is mounted on an inner portion of the telescopic screed, and a cylinder rod of the cylinder is pivotally supported on a pivot at a tip end of the folding link piece.