JP2656210B2 - Screed equipment for paving machines, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screed device for a pavement machine and a repair machine, and more particularly to a screed device capable of arbitrarily changing a pavement width.

[0002]

2. Description of the Related Art A conventional hydraulic telescopic screed apparatus capable of changing the width of a pavement is composed of a main screed 2 connected to a rear portion of a pavement machine 1 as shown in FIGS.
And a pair of left and right telescopic screeds 3 movably mounted laterally by hydraulic cylinders (not shown) at the rear (or front) of the main screed, and the paving machine 1 receives the paving material 5 received from the dump truck 4. Is conveyed to the rear by a bar conveyor, dropped on a road surface to be paved, spread laterally by a screw conveyor 6, and then, while advancing in the direction A, a pavement material having a predetermined width W and a predetermined width by the main screed 2 and the telescopic screed 3. Paving to thickness T.

The right and left telescopic screeds 3 are moved toward the center during the transportation of the pavement machine 1 so that the left and right outer ends fall within the width of the main screed 2, and are expanded according to the width of the pavement during the pavement.

[0004]

The maximum pavement width of a conventional hydraulic telescopic screed device of the above construction is limited to less than twice the main screed width. The reason is that if the body width W 'exceeds a certain width (2.5 m) when transporting the pavement machine, a large trailer must be used and the cost increases, so the width of the main screed is limited to the body width. One telescopic screed must be wide enough to fit within the width of the main screed when contracted. Therefore, the width of the telescopic screed 3 is at most half the width of the main screed 2.
In addition, the movable stroke of the telescopic screed 3 is obtained by subtracting the width of the connecting arm 7 with the main screed and the overlap 8 with the main screed required for pavement. The full width of the screed does not exceed twice the width of the main screed, even in the fully extended state. For this reason, even if the width of the main screed is set to 2.5 m, which is full of the transportation economic limit, the width that can be paved by the conventional screed device is less than 5 m.

[0005] Therefore, when a larger pavement width is required, the attachment 9 is attached to the outer end of the telescopic screed 3 with bolts 10 as shown in FIG. The attachment 9 is heavy and difficult to attach and detach, and in order to form a high quality pavement surface, adjustment is required to align the telescopic screed 3 with the bottom surface 11 of the attachment 9 and the bottom surface of the compaction device. This is an operation that requires skill. These attaching and detaching and adjusting operations have to be performed for preparation before pavement and for transportation after pavement, and therefore, there is a problem in that the method of using the attachment requires a great deal of labor and time. This
If you change the pavement width during the pavement,
Stop the paving machine and remove the attachment
However, this would result in long paving work interruptions.
Deteriorates processing accuracy. Some overseas machines have a main screed width of about 3 m and a maximum widening width of 5 m or more. However, as described above, there is a disadvantage that a great deal of transportation cost is required.

[0006]

According to the present invention SUMMARY OF], the screed apparatus paver provided with a telescopic screed can stretch in both directions of the main screed, the extendable subscriptions
The screed has a width no greater than half the width of the main screed,
At least two telescopic screws in each of these telescopic directions.
The lead is configured to expand and contract parallel to the main screed,
There is provided a screed device characterized in that when the telescopic screed is expanded to the maximum, the entire width of the screed is increased to twice or more the width of the main screed.

In one embodiment of the present invention, the expansion
The creed is located in front of the main screed,
In an embodiment, the telescopic screed is a main screed.
It is provided at the rear.

In another embodiment of the invention, the telescopic screed has a width substantially equal to the width of the main screed and is provided one at the front and the rear of the main screed, and the two telescopic screeds are opposite to each other. Characterized by being configured to move and expand and contract in the direction of.

[0009]

FIG. 1 is a perspective view showing a half of an embodiment of a screed device of the present invention, FIG. 2 is a side view of the screed device of FIG. 1 as viewed from the left side, and FIG. 3 is a plan view thereof. In these figures, reference numeral 12 denotes a main screed having a sheet metal welding structure, and a pair of upper and lower elevating frames 13 and
Are welded, and two guide rods 14, 14 extending in the vertical direction are attached between the vertical lifting frames 13, 13. Provided adjacent to the rear surface of the main screed 12 is a box-shaped block 15 made of a box-shaped structure through which the two guide rods 14 penetrate and which can move up and down between the lifting frames 13.

A first telescopic screed 16 having a sheet metal welding structure is arranged behind the main screed 12 in parallel with the main screed. The upper half of the front wall of the first telescopic screed 16 is open over the entire width, and the half of the block 15 protrudes into the first telescopic screed 16 through the opening 17 to support the hydraulic cylinder 18 above the horizontal. The block 15 supports a rod 19 slidably in the horizontal direction below and in parallel with the hydraulic cylinder 18. The tip of the piston rod 20 of the hydraulic cylinder 18 and one end of the rod 19 (FIG. 1)
3 is fixed to one side wall of the telescopic screed 16 (the left side wall in FIGS. 1 and 3), and the other end of the load 19 is fixed to the other side wall of the telescopic screed 16. Further, the other side wall is provided with a hole 21 through which the hydraulic cylinder 18 penetrates, so that the telescopic screed 16 can move left and right with respect to the main screed 12 as the piston rod 20 expands and contracts.

Behind the first telescopic screed 16, a second telescopic screed 16 'having a sheet metal welding structure is arranged parallel to the first telescopic screed 16. The second telescopic screed 16 'is the main screed 1
The first telescopic screed 16 is mounted on the first telescopic screed 16 in exactly the same manner as the method of mounting the first telescopic screed 16 on the second telescopic screed 16. That is, a pair of vertical frames 13 ', 13' is welded to the rear surface near the outer end of the first telescopic screed 16, and two guide rods 14 'extending vertically between the vertical frames 13', 13 '. A block 15 'is provided that can move up and down along 14'. The block 15 'projects into the second telescopic screed 16' through an opening 17 'in the upper half of the front wall of the second telescopic screed 16' and is parallel to and parallel to a hydraulic cylinder 18 'extending horizontally above and below the protruding portion. The rod 19 'is supported horizontally. The tip of the piston rod 20 'of the hydraulic cylinder 18' and the rod 1
One end of 9 'is fixed to one side wall of the second telescopic screed 16', and the other end of the rod 19 'is connected to the second telescopic screed 16'.
Is fixed to the other side wall. Further, a hole 21 'through which the hydraulic cylinder 18' penetrates is provided on the other side wall, so that the second telescopic screed 1 is formed as the piston rod 20 'expands and contracts.
6 ′ can move left and right with respect to the first telescopic screed 16.

According to the above configuration, the first pavement machine is transported during transportation.
And the hydraulic cylinders 18, 18 'of the second telescopic screeds 16, 16' contract the piston rods 20, 20 'so that both telescopic screeds 16, 16' are accommodated within the width of the main screed 12. Piston rod 2 in paving work
When the 0 is fully extended, the first telescopic screed 16 is fully extended to obtain a screed width substantially equal to the conventional expanded width which is about twice the main screed width. If it is desired to further increase the pavement width, the piston rod 2
0 'is extended and the second telescopic screed 16' is further expanded. Thus, a screed width that is at least twice the main screed width is obtained.

The blocks 15, 15 'are provided between the upper and lower lifting frames 13, 13, 13', 13 '.
14, 14 ′, 14 ′, so that the first telescopic screed 16 can move vertically with respect to the main screed 12 and the second telescopic screed 16 ′ can move vertically with respect to the first telescopic screed 16. , But for the following reasons: That is, in the actual pavement, the pavement thickness T is determined by inclining the screed device with respect to the road surface and setting the working angle θ (about 1 ° to 1.5 °) as shown in FIG. The pavement thickness increases as the angle θ increases, and decreases as the angle θ decreases. Since this final pavement thickness T is determined by the height of the lower edge of the rear surface of the main screed 12, the first telescopic screed 16 and the second telescopic screed 16 'are respectively raised by B and C, and the lower edge of each rear surface is raised. If the height does not match the lower edge of the rear surface of the main screed 12, a step is formed on the pavement surface.
For this reason, it is necessary that the screeds be connected to each other so as to be relatively movable in the vertical direction.

In the above embodiment, the two-stage telescopic screed is mounted behind the main screed, but the telescopic screed may be mounted in front of the main screed 12 as shown in FIG. In this case, a large amount of asphalt mixture 22 is provided on the front surfaces of the main screed 12 and the first telescopic screed 16.
Stagnation, increasing the traction resistance of the vehicle body, causing the vehicle to slip, and causing a decrease in turning performance. Therefore, the main screed 12 and the first telescopic screed 16
Are provided with mix-material inflow prevention covers 23 and 24 at positions substantially corresponding to the position of the front surface of the second telescopic screed 16 'so that an appropriate amount of the mix material flows into the front surfaces of the main screed 12 and the first telescopic screed. . FIG. 6 shows a cross section taken along the line VI-VI of FIG. 5, and shows a mixture inflow prevention cover 23 of the main screed 12 and a mixture inflow prevention cover 24 of the first telescopic screed 16.
The height of the mixture to the first telescopic screed 16 is adjusted to B ', and the height of the mixture to the main screed 12 is adjusted to C', thereby obtaining a predetermined final pavement thickness T.
It shows that you get. Although the above embodiment has two stages of telescopic screeds, it will be apparent that three or more telescopic screeds can be provided as needed.

FIG. 7 shows another embodiment of the present invention, in which telescopic screeds 25, 26 are provided one before and after the main screed 12, and the width of the telescopic screeds 25, 26 is the width of the main screed 12. Is made approximately equal to One telescopic screed 25 expands and contracts to the left of the main screed 12 by the action of a hydraulic cylinder (not shown), and the other screed 26
Expands and contracts to the right. When both telescopic screeds 25, 26 are fully spread, the overall width of the screed is equal to the main screed 1
The width is more than twice and almost three times the width of 2. Also in this case, in order to adjust the amount of the mixture that flows into the front surfaces of the main screed 12 and the rear elastic screed 26, these screeds are positioned at positions substantially matching the positions of the front surfaces of the front elastic screeds 25. 27 and 28.

FIGS. 8, 9 and 10 show the main screed and the first screed.
FIG. 8 shows a modification of the method of connecting the telescopic screed and the second telescopic screed. FIG. 8 shows a guide rail 30 provided on a longitudinally extending holding member 29 attached to the top of the main screed 12. The first telescopic screed 16 can be extended and contracted in the width direction with respect to the main screed 12 by engaging the attached bracket 31 having a T-shaped cross section. The mounting is performed by the hydraulic cylinder 18 and the rod 1 in the embodiment shown in FIGS.
The extension and contraction mechanism according to No. 9 was performed sideways. FIG. 9 shows a holding member 29 also attached to the top of the main screed 12 with a hydraulic cylinder 18 and a rod 19 of the embodiment of FIGS.
The first telescopic screed 16 is expanded and contracted by extending the first telescopic screed 16 horizontally.
The telescopic screed 16 is connected to the telescopic screed 16 by vertically attaching the telescopic mechanism in the same manner as in the embodiment of FIGS. FIG. 10 shows a second telescopic mechanism of the first telescopic screed 16 by vertically attaching two hydraulic cylinders 18 and two rods 19 to a bracket suspended from a holding member 29 mounted on the top of the main screed 12. The telescopic screed 16 'is obtained by attaching the same telescopic mechanism as in the embodiment of FIGS.

[0017]

The screed device of the present invention is the same as a conventional hydraulic telescopic screed device because the screed can be accommodated within the width of the main screed in a contracted state, even though the telescopic screed can be extended to more than twice the main screed. It can be transported at the transportation cost, and the desired large pavement width can be obtained only by one-touch hydraulic operation without attaching the attachment, so the management and maintenance cost of the attachment can be reduced, and the labor and skill required for mounting and removing the attachment Therefore, there is an effect that a higher quality pavement surface can be obtained without the need for a pavement.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a half part of an embodiment of a screed device according to the present invention.

FIG. 2 is a side view of the screed device of FIG. 1;

FIG. 3 is a plan view of the screed device of FIG. 1;

FIG. 4 is a side view showing a state of pavement work by the screed device of FIG. 1;

FIG. 5 is a plan view of an embodiment in which a telescopic screed is provided in front of a main screed.

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5;

FIG. 7 is a plan view of an embodiment in which telescopic screeds are provided one by one before and after a main screed.

FIG. 8 is a side view of a first modified example in which a connection method between a main screed and each telescopic screed of the screed device of FIGS. 1, 2 and 3 is modified.

FIG. 9 is a side view of the second modified example.

FIG. 10 is a side view of the third modified example.

FIG. 11 is a plan view of a pavement machine provided with a conventional hydraulic telescopic screed device.

FIG. 12 is a side view of the paving machine of FIG. 11;

FIG. 13 is a rear view showing a state in which an attachment is attached to an outer end of a telescopic screed in a conventional screed device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pavement machine 12 Main screed 13 Bracket 13 'Bracket 14 Guide rod 14' Guide rod 15 Block 15 'Block 16 First telescopic screed 16' Second telescopic screed 18 Hydraulic cylinder 18 'Hydraulic cylinder 19 Rod 19' Rod 23 Mixing material inflow Prevention cover 24 mixture inflow prevention cover 25 elastic screed 26 elastic screed 27 mixture inflow prevention cover 28 mixture inflow prevention cover

Claims (6)

(57) [Claims] 1. A screed device for a pavement machine and a repair machine provided with a telescopic screed capable of expanding and contracting in both left and right directions of a main screed, wherein the telescopic screed is a main screen.
Have a width equal to or less than half the width of the
At least two telescopic screeds for each main screw
A screed device configured to expand and contract in parallel with the screed so that when the telescopic screed is fully extended, the entire width of the screed is at least twice as large as the width of the main screed. 2. A screed according to claim 1, characterized in that a said extendable screed to the front of the main screed. 3. The main screed has a mixture inflow prevention cover at a position corresponding to the front surface of the frontmost telescopic screed, and a telescopic screed other than the frontmost expansion screed is a mixture inflow prevention cover of the main screed. 3. The screed device according to claim 2 , wherein each of the screed devices has a cover for preventing inflow of the mixture material substantially on the same line as the screed device. 4. The screed device according to claim 1 , wherein the extendable screed is provided at a rear portion of the main screed. 5. The main screed can expand and contract in both left and right directions.
Paving and repair machine screens with telescopic screeds
In the lead device, the telescopic screed has a width substantially equal to the width of the main screed and is provided one at a front part and a rear part of the main screed, and the two telescopic screeds move and expand and contract in directions opposite to each other. A screed device characterized by being constituted. 6. The main screed has a mixture inflow prevention cover at a position corresponding to a front surface of the front expansion and contraction screed, and the rear expansion and contraction screed is substantially collinear with the mixture inflow prevention cover of the main screed. 6. The screed device according to claim 5 , further comprising a cover for preventing inflow of the mixture.