JP3017689B2 - Screed device in asphalt finisher - 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 an asphalt finisher that can expand and contract according to the width of a road to be paved.

[0002]

2. Description of the Related Art Conventionally, a screed device of this kind of asphalt finisher has a structure in which sub-screeds having a width of about 1/2 of the width of the main screed are arranged on the right and left sides of a main screed. What is known is that the left and right sub-screeds are respectively expanded and contracted in the pavement width direction according to the pavement width. However, even when the secondary screed is extended to the maximum length, the pavement width is approximately twice or less the width of the main screed. The screed must be bolted and attached, which requires labor and labor and reduces the work efficiency.

[0003] For this reason, for example, Japanese Patent Application Laid-open No. Hei 7-10252
As described in Japanese Patent Application Publication No. 1 (1993) -1994, first support blocks are vertically movably mounted on both sides of a rear surface of a main screed, and a first hydraulic cylinder and a first hydraulic cylinder are mounted on these first support blocks.
The first and second guide rods are respectively mounted on the left and right first guide rods so that a pair of left and right first telescopic screeds are slidably supported in the pavement width direction, and these first telescopic screeds are respectively expanded and contracted by a first hydraulic cylinder. Further, a second support block on which the second hydraulic cylinder and the second guide rod are mounted is attached to the rear surfaces of the left and right first telescopic screeds in the same manner as described above, and these second hydraulic cylinder and the second guide rod are interposed. A screed device configured to expand and contract the second telescopic screed in the width direction of the pavement has been developed.

[0004]

However, in the structure of the screed device, the main screed is provided with the first hydraulic cylinder and the first guide rod, which are the telescopic mechanism of the first telescopic screed, and the first screed is mounted on the first telescopic screed. Since the second hydraulic cylinder and the second guide rod, which are the telescopic mechanism of the second telescopic screed, are provided, the entire apparatus becomes large and complicated, requiring time and labor for the assembling work, and weight and cost. However, there is a problem that it is difficult to put to practical use.

The present invention has been made in view of such a problem, and an object of the present invention is to use a single fluid pressure cylinder disposed on each of the left and right sides to position the first and second left and right sides of the main screed. To provide a screed device in an asphalt finisher in which a sub-screed is expanded and contracted in the width direction of a pavement, and a vertical movement of a first and a second sub-screed with respect to a main screed can be easily and accurately adjusted according to a pavement thickness. is there.

[0006]

In order to achieve the above object, a screed device according to a first aspect of the present invention comprises a screed device which is symmetrical to a rear portion of a main screed disposed below a rear end of an asphalt finisher. The first sub-screed and the second sub-screed are arranged in a superimposed state in the front-rear direction, and two-stage fluid pressure cylinders extending and contracting in the width direction of the pavement are mounted on the left and right inside the support frame portion of the main screed. The left and right first sub screed mounting frames are moved in the direction of the pavement width by the first stage telescopic rods of the hydraulic fluid cylinder, and the left and right second sub screed mounting frames are moved by the second stage telescopic rods. It is configured to be moved in the direction of the pavement width.

[0007] The invention according to claim 2 is the invention according to claim 1.
In the screed apparatus described in the above, a pair of front and rear fixed guide pipes are fixed to the left and right of the support frame of the main screed in parallel with the two-stage fluid pressure cylinder, and the first-stage telescopic pipe and the A first stage in which the inner side plate of the inner and outer plates on which the first sub-screed mounting frame is formed by slidably inserting a second-stage telescopic pipe smaller in diameter than the first-stage telescopic pipe is inserted into the fixed guide pipe. When the outer side plate is fixed to the inner end side of the first expansion / contraction pipe, the outer side plate is fixed to the outer end side of the first stage expansion / contraction guide pipe, and the inner side plate of the inner / outer plate forming the mounting frame for the second sub screed is the first side plate.
A horizontal guide rod fixed between the inner and outer plates of the sub-screed is slidably supported, and the outer side plate is fixed to the tip of a second-stage telescopic guide pipe.

Further, according to a third aspect of the present invention, in the screed device according to the first or second aspect, the first and second sub-screeds are mounted on the lower ends of the left and right side plates of the respective mounting frames. It is characterized in that it is supported so that its height can be adjusted.

[0009]

When the first-stage telescopic rod of the two-stage hydraulic cylinder mounted in the support frame of the main screed is extended,
The first sub-screed is extruded from the main screed in the pavement width direction. At this time, the second-stage telescopic rod extends integrally with the first-stage telescopic rod in a state of being housed in the first-stage telescopic rod, and the second sub-screed overlaps with the first sub-screed back and forth. And is extruded integrally in the width direction of the pavement. When the second-stage telescopic rod is extended with respect to the first-stage telescopic rod after extruding the first sub screed, the second
The secondary screed is further extruded from the first secondary screed in the direction of the width of the pavement, so that the large screed corresponding to the sum of the width of the main screed and the widths of the first and second secondary screeds can be provided. After extending the second-stage telescopic rod to extrude the second sub-screed in the width direction of the pavement,
The first sub-screed may be extruded in the pavement width direction by extending the first-stage telescopic rod.

According to the second aspect of the present invention, the first
The inner and outer plates forming the mounting frame for the sub-screed are fixed to the inner and outer ends of the first-stage telescopic pipe inserted into the fixed guide pipe fixed to the supporting frame of the main screed. Thus, the first sub-screed can be slidably supported in the width direction of the pavement in a stable and constant posture without being detoured in the front-rear direction. The inner side plate of the side plate is slidably supported by a horizontal guide rod fixed between the inner and outer plates of the first sub screed, and the outer side plate is fixed to the tip of the second-stage telescopic guide pipe. Are stably supported in a state in which they can slide smoothly in the width direction of the pavement without being deviated in the front-rear direction.

In addition, when the two-stage type hydraulic cylinder is contracted, the outer side plate of the mounting frame of the first sub-screed overlaps with the outer side surface of the outer frame of the support frame of the main screed, and the second sub-screed is closed. The outer side plate of the mounting frame overlaps the outer side surface of the outer side plate of the mounting frame of the first sub screed so that the first and second sub screeds can be compactly and smoothly stored in the main screed.

Further, the thickness of the pavement is set by the inclination angle of the main screed with respect to the road surface. Since the first and second sub-screeds are arranged at the rear of the main screed in an overlapping state, the screed device is grounded. When this is done, the bottom surface of the rearmost second sub screed is inclined obliquely upward from the bottom surface of the main screed, and when paving is performed in this state, a step occurs in the pavement surface in the width direction of the pavement. Therefore, in the present invention, the first and second sub-screeds are supported in a height-adjustable manner by hydraulic cylinders mounted on the lower ends of the left and right side plates of the respective mounting frames. With this configuration, the operator can operate the hydraulic cylinder by remote control to easily and accurately adjust the first and second screeds to the same height position with respect to the main screed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, a specific embodiment of the present invention will be described. In FIGS. 1 to 3, reference numeral 1 denotes a main screed having a width substantially equal to the width of an asphalt finisher body A. The first sub screeds 2 and 2 having a width equal to substantially half the width of the main screed 1 are disposed with their front end faces facing the left half and the right half of the rear end face. At the same time, second sub-screeds 3, 3, which are formed to have substantially the same width as or narrower than the first sub-screed 2, with their front end faces facing the rear end faces of the left and right first sub-screeds 2, 2. ing. That is, the first sub screed and the second sub screed are disposed in a state of being symmetrically arranged on the rear part of the main screed 1 in the left-right direction.

The main screed 1 and the first and second sub screeds 2 and 3 are formed in a horizontally long rectangular box shape by a metal plate, and the main screed 1 is fixed and supported on a lower end of a support frame 4. And the first and second sub-screeds 2, 3 are supported by the lower ends of the mounting frames 5, 6, respectively. The support frame 4 is formed in a flat U-shape in which side L-shaped outer side plates 4a, 4a protruding rearward at right angles are integrally provided on both left and right ends of a front plate 4c equal to the width of the main screed 1. The outer side plates 4a, 4a
The left and right sides of the main screed 1 are integrally fixed to the lower end of the front side plate. Further, the front plate 4c of the support frame 4
The inner side plates 4b, 4b having the same shape as the outer side plates 4a, 4a project rearward at the center of the main screed 1 between the left and right inner and outer side plates 4a, 4b facing each other. The left and right space portions 11, 11 substantially equal to the width of / 2 are provided.

Reference numerals 7, 7 denote two-stage hydraulic cylinders disposed in the left and right spaces 11, 11, respectively. The first-stage telescopic rod 7a and the second-stage telescopic rod 7b are accommodated in the cylinder 7. The bottom surface of which is the inner side plate 4b of the support frame 4.
The opening end from which the telescopic rods 7a and 7b are extruded is fixed to the upper part of the outer side plate 4a of the support frame 4 in a penetrating state and is fixed to the center part in the front-rear direction in the upper part of the support frame 4. It is mounted on the frame 4 with the pavement widthwise.

Reference numerals 8 and 9 denote fixed guide pipes in the form of short cylinders arranged on the outer side plate 4a of the support frame 4 with the two-stage hydraulic cylinder 7 at the center and parallel to the front and rear portions thereof. Is fixedly supported by the outer side plate 4a while being inserted therethrough, and the inner end opening is fixedly supported by the intermediate fixed plate 4d disposed parallel to the inside of the outer side plate 4a while being inserted therethrough. First-stage telescopic guide pipes 8a and 9a longer than the fixed guide pipes are slidably inserted into these fixed guide pipes 8 and 9, respectively. Is the second-stage telescopic guide pipe 8
b and 9b are slidably inserted respectively.

The mounting frame 5 for the first sub screed 2
As is clear from FIG. 4, the inner and outer plates 5 arranged on the left and right
a, 5b, and a lower end of these inner and outer plates 5a, 5b
The left and right sides of the sub screed 2 are supported in a suspended state via hydraulic cylinders 10 to be described later, and the inner side plate 5b is disposed between the inner and outer plates 4a and 4b of the support frame 4, and the upper end thereof is formed. First-stage telescopic guide pipe 8 formed long in the front-rear direction and protruding inward from fixed guide pipes 8 and 9
The upper end of the outer side plate 5a is also formed to be longer in the front-rear direction, and the center and both front and rear ends of the outer side plate 5a are fixed to the first-stage telescopic rod 7a of the two-stage hydraulic cylinder 7. They are fixed to the distal end face and the outer opening ends of the front and rear first-stage telescopic guide pipes 8a and 9a, respectively. A hole 21 through which the two-stage hydraulic cylinder 7 is inserted is provided at the center of the inner side plate 5b of the mounting frame 5.

Therefore, when the first-stage telescopic rod 7a of the two-stage hydraulic cylinder 7 is retracted and housed in the two-stage hydraulic cylinder 7, the inner and outer plates 5a of the mounting frame 5 for the first sub-screed 2 are provided. 5b are superposed on the outer surfaces of the inner and outer plates 4a, 4b of the support frame 4 of the main screed 1, respectively.
In this state, the front end faces are arranged close to the left and right rear sides of the rear end face.

Similarly, the mounting frame 6 for the second sub screed 3 also includes inner and outer plates 6a and 6b arranged on the left and right, and the left and right ends of the second sub screed 3 are attached to the lower ends of these inner and outer plates 6a and 6b, respectively. A horizontal guide rod supported in a suspended state via a hydraulic cylinder 16 to be described later and having an upper end portion of the inner side plate 6b fixed between lower end portions of the inner and outer plates 5a and 5b of the mounting frame 5 of the first sub screed 2. The upper end of the outer side plate 6a is formed to be long in the forward direction, and the end surface of the second-stage telescopic rod 7b of the two-stage hydraulic cylinder 7 is provided at the center and both front and rear ends thereof. The front end faces of the front and rear second-stage telescopic guide pipes 8b and 9b are fixed to each other.

Therefore, when the second-stage telescopic rod 7b of the two-stage hydraulic cylinder 7 is retracted and housed in the one-stage retractable rod 7a, the inner side plate 6b of the mounting frame 6 of the second sub-screed 3 is Mounting frame 5 for first sub screed 2
, The outer side plate 6a overlaps the outer side surface of the outer side plate 5a of the mounting frame 5 for the first sub-screed 2, and the second sub-screed 3 is
The front end face is brought close to the rear end face.

To mount the first sub screed 2 at the lower end of the inner and outer plates 5a, 5b of the mounting frame 5 in a suspended state, a short stroke hydraulic cylinder 10 is mounted at the center of the lower end of the facing surface of the inner and outer plates 5a, 5b. , 10 are fixed in a vertical state, and the lower ends of the rods are respectively connected and fixed to the upper central portions of both side ends of the first sub screed 2, and a vertical guide is formed at the front and rear ends of the upper surface at both side ends of the first sub screed 2. By fixing the lower ends of the rods 12 and 13, these vertical guide rods 12 and 13 are
A guide tube 1 fixed to the front and rear portions of the lower surface of the facing surfaces of a and 5b
4, and 15 are slidably inserted respectively (see FIG. 7).

The structure in which the second sub screed 3 is mounted in a suspended state between the lower ends of the inner and outer plates 6a and 6b of the mounting frame 6 is the same as that of the first sub screed 2. That is, the short-stroke hydraulic cylinders 16 and 16 are fixed vertically in the center of the lower ends of the facing surfaces of the inner and outer plates 6a and 6b, and the lower ends of the rods are respectively positioned at the center of the upper surface of both side ends of the second sub screed 3. At the same time, the lower ends of the vertical guide rods 17 and 18 are fixed to the front and rear ends of the upper surface at both side ends of the second sub screed 3 so that these vertical guide rods 17 and 18 are attached to the inner and outer plates 6.
A guide tube 1 fixed to the front and rear portions of the lower surface of the opposing surfaces of a and 6b
They are slidably inserted through 9, 20 respectively (see FIG. 6).

As the structure of the two-stage hydraulic cylinder 7 for expanding and contracting the first and second sub screeds 2 and 3 in the width direction of the pavement with respect to the main screed 1, a known structure is used, for example, as shown in FIG. The piston 7a 'of the first-stage telescopic rod 7a is slidably provided in the cylinder body 7'.
The first stage telescopic rod 7a is configured to operate by supplying and discharging pressure oil from ports formed at both ends in the length direction of 7 ', and the hollow inside of the first stage telescopic rod 7a The piston 7b 'of the second-stage telescopic rod 7b is slidably provided, and the pressure oil from the one port is supplied to the piston 7a' of the first-stage telescopic rod 7a to the piston 7b 'of the second-stage telescopic rod 7b. Drilling holes on the back side for supply and discharge,
Further, the piston 7a 'of the first-stage telescopic rod 7a is provided with a passage (not shown) for supplying and discharging the pressure oil from the other port to the front side of the second-stage telescopic rod 7b. is there. The two-stage hydraulic cylinder 7 is not limited to a hydraulic pressure, and may use other fluid pressures.

As shown in FIG. 2, the left and right arms of the screed device constructed as described above have the support frame 4 of the main screed 1 pivotally mounted on both side surfaces of the asphalt finisher main body A at the base ends so as to be vertically rotatable. The pivotal portion of the left and right arm members 23 is fixed and supported at the tip of a member 23, and is supported up and down by a hydraulic cylinder 24 mounted on the main body A, and is connected between the upper ends of the rear surfaces of the main body A. The tip of the left and right arm members 23 is vertically rotated by the working hydraulic cylinder 25 to raise and lower the entire screed device, and by operating the base-side hydraulic cylinder 24, the height of the main screed 1 with respect to the road surface, That is, it is configured to adjust the pavement thickness.

In order to perform the pavement work, after asphalt mixture is put into the hopper 26 mounted on the main body A, the main body A is moved slowly on the road surface to be paved and stretched on the bottom side of the main body A. When driving around the bar conveyor 27
The asphalt mixture is supplied onto the bar conveyor 27 from the lower end of the opening of the hopper 26, is conveyed backward by the bar conveyor 27, and is discharged from the discharge end to the road surface. Further, the asphalt mixture discharged on the road surface is spread in the width direction of the road surface by a screw gombar 28 disposed at the lower rear portion of the main body A, and then paved to a predetermined width and thickness by a screed device. Things.

At this time, the width of the screed device is adjusted in accordance with the width of the road surface to be paved, and the adjustment is performed by disposing the screed device in the left and right spaces 11, 11 of the support frame 4 of the main screed 1. First stage telescopic rod of two-stage hydraulic cylinder 7
The first and second sub-screeds 2 and 3 are sequentially extended from the main screed 1 in the direction of the pavement width by sequentially extending the 7a and the second-stage telescopic rod 7b, and the extended end is located on the road shoulder. Done. Since the operation of the first and second sub screeds 2 and 3 is the same on the left and right sides, as shown in FIGS. 1 and 4, the paving by the first and second sub screeds 2 and 3 disposed on the left side is performed. The method of adjusting the width will be described in detail below.

First, when the first-stage telescopic rod 7a of the two-stage hydraulic cylinder 7 is extended, the outer side plate of the mounting frame 5 of the first sub screed 2 integrally fixed to the rod end is provided.
A first-stage telescopic guide pipe 8a that is integrally moved in the road surface width direction and is fixed to both front and rear ends of the outer side plate 5a;
9a is drawn out through the fixed guides 8, 9 and the inner side plates 5b fixed to the inner ends of the first-stage telescopic guide pipes 8a, 9a also move integrally, and the inner side plates 5a, 5b The suspended first sub screed 2 is pushed out from the rear side of the main screed 1 in the road surface width direction. At this time, since the outer side plate 6a of the mounting frame 6 of the second sub screed 3 overlaps the outer side surface of the outer side plate 5a of the first sub screed 2, the second sub screed 3 also overlaps behind the first sub screed. In this state, it is integrally pulled out in the road surface width direction.

The first-stage telescopic rod of the two-stage hydraulic cylinder 7
If the first sub-screed 2 does not reach the end of the pavement width on the road surface even if 7a extends to the maximum, then the second-stage telescopic rod 7b of the two-stage hydraulic cylinder 7 is extended. When the rod 7b is extended, the outer side plate 6a of the mounting frame 6 of the second sub-screed 3 moves integrally in the width direction of the road and is fixed to the front and rear end portions of the outer side plate 6a in the second and subsequent stages. Guide pipes 8b and 9b are the first-stage telescopic guide pipes 8a,
9a, the inner side plate 6b slides on the horizontal guide rod 22 in the mounting frame 5 of the first sub screed 2 so that the second sub screed 3 is moved from the rear side of the first sub screed 2 in the road surface width direction. When it is extruded and reaches the pavement width, it is stopped and pavement work is performed. When the first and second sub screeds 2 and 3 on the left and right are extended to the maximum, the maximum pavement width is approximately 2.5 times the width of the main screed 1, and within this range, these first and second sub screeds 2 and 3 are provided. The two or three hydraulic cylinders 7 adjust the lengths of the two or three extending in the road surface width direction, and paving them in accordance with the road surface width.

As described above, the two-stage hydraulic cylinder 7
Without first extending the first-stage telescopic rod 7a and the second-stage telescopic rod 7b sequentially to extend the first and second sub-screeds 2, 3 sequentially in the road surface width direction. To extend the second sub-screed 2 in the road surface width direction to a position where the bottom surface 2a of the second sub-screed 2 is viewed from the front and the continuity with the bottom surface 1a of the main screed 1 is not interrupted. The second sub screed 3 may be further extended in the road surface width direction by extending the first sub screed 2.

In this case, when the second sub screed 3 is extended, the first sub screed 2 overlaps the rear part of the main screed 1. However, when the first sub screed 2 is extended, the first The distal end of the telescopic rod 7a abuts against the inner side surface of the outer side plate 5a of the mounting frame 5 of the first sub screed 2,
At the time of storage, first, the second-stage telescopic rod 7b is contracted so that the outer side plate 6a of the mounting frame 6 of the second sub-screed 3 is moved to the first position.
After being brought into contact with the outer side surface of the outer side plate 5a of the sub screed 2, the second-stage telescopic rod 7b is further connected to the first-stage telescopic rod 7a.
Therefore, it is not necessary to fix the distal end of the first-stage telescopic rod 7a to the outer side plate 5a of the mounting frame 5.

To adjust the pavement thickness, first, when the left and right arm members 23, 23 provided on both sides of the main body A are rotated downward by the hydraulic cylinder 25, the bottom rear edge of the second sub screed 3 is grounded. From the bottom surface 3a, which is the iron portion of the second sub screed 3, the bottom surface 1a, which is the iron portion of the main screed 1,
To a state inclined obliquely upward. In this state, the pavement thickness is adjusted by operating the hydraulic cylinder 24 on the base end side of the left and right arm members 23, 23 to set the inclination angle thereof. When paving is performed by extending the first and second sub screeds 2 and 3 in the width direction of the road surface in a state where 1a to 3a are inclined,
The thickness paved by the bottom surfaces 2a, 3a of the first and second sub screeds 2, 3 becomes smaller stepwise than the thickness paved by the bottom surface 1a of the main screed 1. Therefore, the mounting frames 5a of the first and second sub screeds 2, 3
Hydraulic cylinders 10, 16 attached to the lower ends of 5b, 6a, 6b
To remotely contract its piston rod,
After the bottom surfaces 2a and 3a of the second sub screeds 2 and 3 are adjusted to be the same height as the bottom surface 1a of the main screed 1 with respect to the road surface, pavement work is performed.

[0032]

As described above, according to the screed device in the asphalt finisher of the present invention, the first sub-screed and the second sub-screed are arranged in a symmetrical manner at the rear part of the main screed, respectively, in a longitudinally superposed state. At the same time, two-stage hydraulic cylinders that expand and contract in the width direction of the pavement are mounted on the left and right inside the support frame portion of the main screed, and the left and right first sub-screeds are formed by the first-stage telescopic rods of these left and right two-stage hydraulic cylinders. Since the mounting frames of the left and right second sub-screeds are respectively moved in the direction of the pavement width by the second-stage telescopic rods, the mounting frames are moved in the direction of the pavement width. The first and second sub-screeds are sequentially moved in the pavement width direction with respect to the main screed by the More than twice the width of the pavement, and the width adjustment work can be performed accurately and easily, improving work efficiency, having a simple structure and a small overall weight, and reducing manufacturing costs and realizing practical use. Is what you can do.

Further, the inner side plate of the inner and outer plates forming the mounting frame of the first sub screed is fixed to the inner end side of the first-stage telescopic pipe inserted into the fixed guide pipe fixed to the support frame of the main screed. The outer side plate is fixed to the outer end side of the first-stage telescopic guide pipe, so that the first sub-screed does not move in the front-rear direction with respect to the main screed, and has a stable and stable posture in the pavement width direction. Similarly, the inner side plates of the inner and outer plates forming the mounting frame for the second sub-screed can be slid on the horizontal guide rod fixed between the inner and outer plates of the first sub-screed. And the outer side plate is fixed to the tip of the second-stage telescopic guide pipe, so that the second sub-screed can also slide smoothly in the width direction of the pavement without moving in the front-back direction. It may have been stably supported in a state.

In addition, when the two-stage type hydraulic cylinder is contracted, the outer side plate of the mounting frame of the first sub-screed overlaps with the outer side surface of the outer frame of the support frame of the main screed, and the second sub-screed is closed. The outer side plate of the mounting frame overlaps the outer side surface of the outer side plate of the mounting frame of the first sub screed so that the first and second sub screeds can be compactly and smoothly accommodated in the main screed.

Further, since the first and second sub-screeds are integrally connected to the lower ends of the rods of the hydraulic cylinders mounted on the lower ends of the left and right side plates of the respective mounting frames, the operator can remotely control these hydraulic screeds. By operating the cylinder, the first and second screeds can be easily and accurately adjusted to the same height position with respect to the main screed, and the pavement work can be performed smoothly and accurately.

[Brief description of the drawings]

FIG. 1 is a perspective view of a left half of a screed device;

FIG. 2 is a side view of an asphalt finisher,

FIG. 3 is a simplified front view of a screed device extended by a two-stage hydraulic cylinder,

FIG. 4 is a partial longitudinal rear view of first and second sub screeds supported via a guide pipe;

FIG. 5 is a simplified plan view showing a state in which first and second sub screeds are moved in a widening direction with respect to a main screen.

FIG. 6 is a side view of a screed device,

FIG. 7 is a vertical side view of a first sub screed portion.

[Explanation of symbols]

 A Asphalt finisher body 1 Main screed 2 First sub-screed 3 Second sub-screed 4 Support frame 5, 6 Mounting frame 7 Two-stage hydraulic cylinder 7a First-stage telescopic rod 7b Second-stage telescopic rod 8, 9 Fixed guide pipe 8a , 9a First stage telescopic guide pipe 8b, 9b Second stage telescopic guide pipe 10, 16 Hydraulic cylinder

Claims (3)

(57) [Claims] 1. A first sub-screed and a second sub-screed are symmetrically arranged at a rear portion of a main screed disposed at a lower end of a rear end of an asphalt finisher. Two-stage hydraulic cylinders that expand and contract in the width direction of the pavement are mounted on the left and right sides of the frame portion, and the left and right two-stage hydraulic cylinders use the first-stage telescopic rods to attach the left and right first sub-screed mounting frames to the pavement width. The screed device in the asphalt finisher, wherein the screed device is configured to move the mounting frames of the left and right second sub-screeds in the direction of the width of the pavement by means of the second-stage telescopic rods. 2. A pair of front and rear fixed guide pipes are fixed to the left and right sides of the support frame of the main screed in parallel with the two-stage type fluid pressure cylinder. And a second-stage telescopic pipe smaller in diameter than the first-stage telescopic pipe are slidably inserted, and the inner side plates of the inner and outer plates forming the mounting frame of the first sub-screed are inserted through the fixed guide pipe. When fixed to the inner end of the first-stage telescopic pipe, the outer side plate is fixed to the outer end of the first-stage telescopic guide pipe, and the inner side plate of the inner and outer plates forming the mounting frame for the second sub-screed is connected to the first sub-screed. 2. The asphalt fin according to claim 1, wherein the outer side plate is fixed to a tip end of a second-stage telescopic guide pipe slidably supported by a horizontal guide rod fixed between the inner and outer plates. Screed device in the washer. 3. The first and second sub screeds are integrally connected to the lower end of a rod of a hydraulic cylinder mounted on the lower end of the inner and outer plates of each mounting frame, and the vertical movement is adjusted by the operation of the hydraulic cylinder. The screed device in the asphalt finisher according to claim 1 or 2, wherein the screed device is configured to be capable of being configured.