JP2678427B2 - Screed device for paving machine - 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 applied to a paving machine such as an asphalt finisher or a repaver / remixer.

[0002]

2. Description of the Related Art Conventionally, a paving machine such as an asphalt finisher or a repaver / remixer, or a repairing machine has been used for construction such as road paving or road repairing. In this specification, for convenience of description, they will be referred to as a paving machine as a representative, and a conventional screed device will be described by an example applied to an asphalt finisher. Referring to FIG. 8, in the asphalt finisher 2, a hopper 4 for receiving the mixture 3 is arranged in front of the driver's seat 6. Further, a bar conveyor 8 for conveying the mixture 3 in the hopper 4 is provided,
The bar conveyor 8 conveys the mixture 3 in the hopper 4 to the rear part of the machine. At the rear part, a conveyor screw 10 is provided, which spreads the conveyed mixture material 3 on the road surface and discharges it. Behind the conveyor screw 10,
A screed device 12 is provided for compacting the composite material 3 spread on the road surface and finishing the surface smooth, that is, for finishing the paved road surface. Screed device 12
Is a main screed 14 arranged in the central portion in the width direction, and a pair of elastic portion screeds 16 and 18 arranged in the rear portion of the main screed 14 and movably provided outward in the width direction.
And The elastic part screeds 16 and 18 have substantially the same structure. A deflector 15 is provided at the front end portion of the main screed 14, and the expandable portion screed 16 is provided.
The front ends of and 18 and 18 are deflectors 17 and 19 respectively.
Is provided. By the way, the construction width of the road paved using the asphalt finisher 2 varies, and the construction width may change in the middle of construction. The expansion / contraction part screeds 16 and 18 are provided to cope with the above circumstances. In the present specification, the width direction means the asphalt finisher 2
Means a left-right direction (left-right direction in FIG. 8) orthogonal to the traveling direction (upper direction in FIG. 8), front means a position closer to the traveling direction or the position closer to the traveling direction, and rear means a direction opposite to the traveling direction. It means a position in the direction (downward in FIG. 8) or in the direction opposite to the traveling direction.

[0003] When the construction work on the paved road surface is performed by the asphalt finisher 2 constructed as described above and the construction width is wider than the main screed 14, the expansion portion screeds 16 and 18 are set to the construction width in advance. It is moved (widened) outward in the width direction to accommodate it. Into the hopper 4 on the front side of the machine, for example, the composite material 3 is loaded from a dump truck (not shown) which travels in parallel forward. The composite material 3 is conveyed to the rear part by the bar conveyor 8 and is discharged while being spread to the construction width on the road surface by the conveyor screw 10. The discharged composite material 3 is spread by the deflector 15 and the main screed 14 in the widthwise central portion, and by the deflector 17 and the expansion / contraction portion screed 16 and the deflector 19 and the expansion / contraction portion screed 18 and the like in the wider portion, respectively. The paved road surface is evenly formed, and the construction work for a series of asphalt paving is completed.

When the construction width of the paved road surface is wider than the width of the main screed 14 plus the expansion portion screeds 16 and 18, the expansion portion screeds 16 and 1 are responsive to the construction width.
An auxiliary screed 20 having substantially the same structure is sequentially and additionally connected to the outer side in the width direction of 8. The structure and connection mode of the auxiliary screed 20 will be specifically described with reference to FIGS. 9 and 10. Note that, here, the auxiliary screed 20 connected to the expandable portion screed 16 will be representatively described. A base plate member 21 having a flat lower surface is provided at the bottom of the auxiliary screed 20, and the deflector 2 is provided at the front end of the base plate member 21.
2 are provided upright. Side plates 24 are provided upright on both sides of the auxiliary screed 20, respectively.
An opening 26 is formed in each of the four. A channel type frame 28 extending in the width direction is provided on the upper surface of the base plate member 21, and both ends thereof are connected to the side plates 24. The expandable section screed 16 is also provided with a base plate member 31, a deflector (not shown), a side plate 30 and a frame 32 in the same manner. An opening 34 is formed in the side plate 30. The shapes and positions of the frames 28 and 32 and the openings 26 and 34 are defined so that they are arranged in a mutually aligned form when viewed in the width direction.

Auxiliary screed 20 and elastic screed 1
6 is connected to the measuring plate 24 and the side plate 3 by connecting bolts 38 at the three connecting portions via the contact plates 36, respectively.
This is done by connecting 0 and 0. Similarly, the auxiliary screeds 20 are connected to each other at three connecting portions by connecting the measuring plates 24 to each other with connecting bolts 38 via the contact plates 36. In such bolt connection work, since it is necessary to ensure the flatness of the pavement finish surface, the bottom surface of the base plate member 21 of the auxiliary screed 20 and the bottom surface of the base plate member 31 of the expandable screed 16 are positioned on the same plane. Must be connected to each other. Two adjusting fittings 40 are used for this purpose. Each adjustment fitting 40
Is composed of a block member having a concave portion formed on the lower surface of the central portion in the width direction. One end of each adjustment fitting 40 is connected to the upper surface of the frame 28 of the auxiliary screed 20 by a bolt, and the other end is positioned so as to project laterally outward from the opening 26. The adjustment fittings 40 are arranged on the upper surface of the frame 28 at intervals in the front-rear direction. An adjustment bolt 42 is attached to the other end of each adjustment fitting 40 such that the lower end thereof projects from the lower surface of each adjustment fitting 40.

The procedure for connecting the auxiliary screed 20 and the expansion / contraction part screed 16 using each adjustment fitting 40 is as follows. That is, first, the recessed portion of each adjustment fitting 40 of the auxiliary screed 20 is hooked on the edge of the opening 34 of the expansion / contraction part screed 16 which is a connection partner, so that the weight of the auxiliary screed 20 to be connected is stored in the expansion / contraction part screed 16. To Next, the connection bolts 38 are temporarily tightened, and the adjustment fittings 4 located at the front and rear are provided.
The connection bolts 38 are tightened while adjusting the vertical level and the inclination in the front-back direction of the auxiliary screed 20 using the adjustment bolt 42 of 0. By this adjustment and tightening work, the bottom surface of the auxiliary screed 20 can be positioned on the same plane as the bottom surface of the telescopic portion screed 16. After adjusting the level and inclination, adjust bolt 42
Is locked in position by a nut 44. The connection between the auxiliary screeds 20, which is performed by using the respective adjustment fittings 40, is similarly performed.

[0007]

It is important that the attachment / detachment work of the auxiliary screed 20 and the expansion / contraction part screed 16 and the attachment / detachment work of the auxiliary screeds 20 are performed quickly and efficiently. However, in the conventional widening operation of the screed device 12, the weight of the auxiliary screed 20 to be connected is set to the expansion part screed 1 which is the connection partner.
6 or auxiliary screed 20 for each adjustment fitting 4
It includes the process of supporting by using 0 to deposit.
On the contrary, when the auxiliary screed 20 is to be removed from the expandable portion screed 16 or the auxiliary screed 20, the work of removing each adjustment fitting 40 from the mating opening 26 or 34 must be performed. Since the weight of the auxiliary screed 20 is heavy, it imposes a heavy burden on the operator and has a problem in the workability of expanding and contracting the construction width. Further, since the weight is heavy, it is not easy to carry the auxiliary screed 20 for transportation.

On the other hand, the adjustment work for making the bottom surface of the auxiliary screed 20 and the bottom surface of the expansion part screed 16 or the auxiliary screed 20 which is the connection partner the same plane must be performed while looking at the two points of the level and the inclination. There is. Therefore, the adjustment while turning the adjustment bolts 42 of the two adjustment fittings 40 is complicated and requires skill, and even a skilled person requires a considerable amount of time. As a result, there is a problem in terms of workability of expansion and contraction of construction width and work efficiency.

The present invention has been made on the basis of the above facts, and its main purpose is to provide a screed for an improved pavement machine, which has almost no burden on the operator in the work of expanding and contracting the working width and has a significantly high work efficiency. It is to provide a device.

[0010]

In order to achieve the above main object, according to the present invention, a main screed arranged in a widthwise central portion and a main screed arranged at a rear portion of the main screed and moved outward in the widthwise direction. In a screed device for a paving machine including a pair of elastic section screeds that are freely provided, each of the elastic section screeds is provided with an elastic section widener, and each of the elastic section screeds is arranged at a front end portion. A deflector, a first guide means provided on the deflector, a second guide means provided on the rear side of the deflector, and a hydraulic cylinder including a piston rod are provided. A side frame that is provided so as to extend in the front-rear direction at an outer end in the direction, a deflector that is arranged at a front end portion, and one end of which is connected to the side frame; A first guided means provided on the deflector and a second guided means provided on the rear side of the deflector and having one end connected to the side frame. One guided means is movably supported by the first guide means, and the second guided means
The guided means of the second guide means is movably supported by the second guide means, and the side frame is connected to one end of the piston rod. A paving machine movably supported and characterized in that the deflector of each of the telescopic wideners is defined such that the movement is along the front surface of the deflector of each of the telescopic screeds. A screed device is provided.

[0011]

In the non-widening operation, each of the elastic portion wideners is positioned so as to be substantially housed in the structure of each of the elastic portion screeds. At the time of widening, each of the expansion / contraction part screeds is moved outward in the width direction by a known expansion / contraction device and positioned at a predetermined position. Next, pressure oil is supplied into each hydraulic cylinder of the expandable screed, and each piston rod is moved outward in the width direction. Since each side frame of the expandable portion widener is moved outward in the width direction, each first guided means of the expandable portion widener moves in the same direction along each first guide means of the expandable portion screed. Then, the second guided means is moved in the same direction along the second guide means of each of the expandable section screeds. Each of the deflectors, one end of which is connected to each of the side frames, is moved outward in the width direction along the front surface of each of the deflectors of the elastic section screed. The amount of movement of each expander / retractor widener for each expander / retractor screed is:
It is decided according to the required construction width. After the paving of the road surface is completed, pressure oil is supplied into each hydraulic cylinder of the expandable screed, and each piston rod is moved inward in the width direction. Each of the elastic portion wideners is moved inward in the width direction opposite to the above, and is positioned so as to be substantially housed in each structure of the elastic portion screed. In this way, since the expansion / contraction operation of the construction width is performed by the operation of the hydraulic cylinder, there is almost no burden on the operator in the expansion / contraction work of the construction width, and the work efficiency is significantly increased.

The height of the lower end of each deflector of the expansion / contraction widener is set to be substantially the same as the height (minimum ground clearance) of the lower surface of each of the expansion / contraction screeds in advance, so that The pavement thickness by the deflector can be made substantially the same as the pavement thickness by each of the elastic section screeds. Each first guide means of the expansion / contraction part screed is vertically movable with respect to each deflector of the expansion / contraction part screed, and each deflector of the expansion / contraction part widener is vertically movable with respect to each side frame. Is preferred. In the case of this structure, the height of the lower end of each deflector of the expansion / contraction widener can be adjusted within a predetermined range. As a result, the pavement thickness can be changed appropriately, and the accuracy of the pavement surface can be further improved.

It is preferable that a sliding plate member extending in the width direction is provided at a position rearward of the deflector in each of the expansion / contraction wideners. The front end of each of the sliding plate members is rotatably supported by each of the expansion / contraction wideners by the shaft means, and the rear end of each of the sliding plate members is supported by being connected to each of the expansion / contraction wideners by a connecting member. To be done. The formation of the paved road surface by each of the expansion and contraction widener,
The composite material discharged to the road surface by the conveyor screw is first spread by the respective deflectors so as to have a uniform height, and then spread by the sliding plate members located at the rear of the respective deflectors. Be done. In the case of the configuration including the sliding plate member in addition to the deflector, each of the expander / contractor wideners forms a pavement road surface with higher accuracy.

Each sliding plate member is preferably provided with an inclination adjusting means capable of adjusting the inclination in the front-rear direction or a level adjusting means capable of adjusting the height of each. With these configurations, a paved road surface that meets the conditions of the composite material is formed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a screed device constructed according to the present invention will be described with reference to FIGS. Note that FIG.
In FIG. 4, the same parts as those in FIGS. 8 to 10 are designated by the same reference numerals, and the description thereof will be omitted. 1 to 3, an asphalt finisher, generally designated by the numeral 50, comprises a screed device 52 constructed in accordance with the present invention. The screed device 52 includes a main screed 14 arranged in the widthwise central portion, and a pair of elastic portion screeds 54 and 56 arranged in the rear portion of the main screed 14 and movably provided outward in the widthwise direction. There is. Telescopic part screed 5
The basic structure of 4 and 56 is the same as that of the conventional expandable screed 1
Substantially the same as 6 and 18. Telescopic screed 54
The expansion / contraction part widener 58 is provided in the expansion / contraction part screed 56, and the expansion / contraction part widener 60 is provided in the expansion / contraction part screed 56. The elastic section screeds 54 and 56 have substantially the same configuration, and the elastic section wideners 58 and 60 have substantially the same configuration. Therefore, the expansion / contraction part screed 54 and the expansion / contraction part widener 58 will be described below as representatives thereof.

The expansion / contraction part screed 54 is provided with a deflector 17 arranged substantially upright at the front end, a first guide means provided on the deflector 17, which will be described later, and the deflector 17.
It includes a second guide means, which will be described later, provided at the rear of the hydraulic cylinder 64, and a hydraulic cylinder 64 including the piston rod 62. The first guide means is provided in the width direction along the upper edge of the front surface of the deflector 17, and the deflector 17 is provided.
The guide member 66 is mounted so as to extend in the width direction along the upper edge of the front surface of the. The guide member 66 is detachably attached to the elongated plate 65 fixed to the front upper edge of the deflector 17 by welding with a plurality of bolts 67. That is, the guide member 66 is formed with a plurality of elongated holes 66a extending in the vertical direction, and each bolt 67 is formed in the elongated hole 6a.
It penetrates 6a and is screwed to the plate 65. Therefore, the mounting position of the guide member 66 can be adjusted in the vertical direction by the elongated holes 66a. A guide groove 68 is formed on the side of the guide member 66 facing the front surface of the deflector 17. The guide groove 68 has a substantially channel shape. A gap is formed between the surface of the guide member 66 facing the front surface of the deflector 17 and the front surface of the deflector 17. The second guide means includes three cylindrical guide members 70 that extend in parallel to the width direction,
It is composed of 72 and 74. The guide members 70 and 72 are vertically spaced apart at a position near the deflector 17. The guide member 74 is arranged at a position further rearward than the guide members 70 and 72. Each of the guide members 70, 72 and 74 is arranged at a position closer to the outer end (left end) in the width direction of the expansion / contraction part screed 54, and is fixed and supported by a support bracket (not shown). The hydraulic cylinder 64 includes guide members 70 and 7
It is arranged at an intermediate portion in the vertical direction of 2 and is fixed and supported by a support bracket (not shown). The guide groove 68 of the guide member 66, the guide members 70, 72 and 74, and the hydraulic cylinder 64 are arranged in parallel.

The expander / contractor widener 58 has a side frame 76 provided at the outer end (left end) in the width direction so as to extend in the front-rear direction, a deflector 78 arranged at the front end and having one end connected to the side frame, and a deflector. 7
8 and a first guided member, which will be described later, and one end of the side frame 7 which is provided behind the deflector 78.
And a second guided member which will be described later and is connected to the control unit 6. The side frame 76 is composed of a box-shaped structure,
A protruding portion 77 extending in the vertical direction at an outer side position where the guide members 70 and 72 and the hydraulic cylinder 64 are provided.
Are formed. The deflector 78 is the deflector 1 described above.
It is shaped so as to be in close contact with the front surface of 7. A support plate 78a extending in the vertical direction is fixed above the left end portion of the deflector 78, and a support member 76a is provided upright inside the width direction of the side frame 76. The support member 76 a is a projecting portion 77 of the side frame 76.
It is provided so as to project upward from the inner part of the. A long hole 76b extending vertically is formed in the support member 76a. The deflector 78 is connected to the inside of the side frame 76 in the width direction by a plurality of bolts 76c via a support plate 78a and a support member 76a. Bolt 76
The c is fitted in a predetermined position of the support plate 78a, penetrates the elongated hole 76b of the support member 76a, and is fastened. Therefore, by loosening the bolt 76c, the vertical position of the deflector 78 is adjusted along the elongated hole 76b.
A curved portion that extends rearward is formed at the lower end of the deflector 78.

The first guided member comprises a guided member 79 fixed so as to extend in the width direction along the upper edge of the front surface of the deflector 78. The guided member 79 is composed of a square bar having a rectangular cross section. Therefore, a protrusion formed by the guided member 79 is formed on the upper edge of the front surface of the deflector 78. The second guided member includes three guided rod members 8 each having a circular cross section and extending parallel to the width direction.
It is composed of 0, 82 and 84. The left end of each guided rod member 80, 82 and 84 is the side frame 7
It is fixed to the inner side of 6 in the width direction. The guided rod member 80 is disposed substantially on the same axis as the guide member 70,
The guided rod member 82 is arranged substantially on the same axis as the guide member 72, and the guided rod member 84 is arranged substantially on the same axis as the guide member 74.

The guided member 79 is movably (slidingly) fitted and supported in the guide groove 68 of the guide member 66, and the guided rod member 80 is movably fitted and supported in the guide member 70 to be guided. The rod member 82 is movably fitted and supported by the guide member 72, the guided rod member 84 is movably fitted and supported by the guide member 74, and the left end of the piston rod 62 is further attached to the side frame 7.
By being connected to the inner side in the width direction of 6, the expansion / contraction widener 58 is supported movably outward in the width direction with respect to the expansion / contraction screed 54. The position of the deflector 78 of the expansion / contraction widener 58 is defined so that the deflector 78 of the expansion / contraction screed 54 can be moved along the front surface of the deflector 17.

Referring to FIGS. 2 to 4, a sliding plate member 90 having a substantially rectangular flat surface extending in the width direction is provided at a position rearward of the deflector 78 (the rearmost position in the embodiment) in the expansion / contraction widener 58. Is provided. The sliding plate member 90 includes a base plate member 91. The base plate member 91 has a flat bottom surface, and its front end portion is formed to extend upward while curving (formed in a sled shape). Side plates 92 and 94 are provided upright on both ends in the width direction of the sliding plate member 90, and a rear plate 96 is provided upright on the rear end. The front end portion of the sliding plate member 90 is rotatably supported by the expansion / contraction widener 58 by a shaft means described later. The rear end of the sliding plate member 90 is supported by being connected to the expander / contractor widener 58 by a chain 98 that is a connecting member. Chain 9
One end of 8 is connected to the side frame 76 via a bracket 99, and the other end is connected to the side plate 92. One end of the chain 98 is located higher than the other end, so that the rear end of the sliding plate member 90, which tends to rotate downward around the shaft means of the front end, is hung by the chain 98 on the expansion / contraction widener 58. It is supported by the form. Chain 98
The connection by is done loosely. Therefore, the inclination of the sliding plate member 90 in the front-rear direction is free because it is only on the paved road surface.

Support frames 100 and 102 are provided at the rear end of the side frame 76 and the other end of the guided rod 84 included in the second guided means, respectively. The support frame 100 is attached so as to extend downward from the rear end of the side frame 76.
2 is attached so as to extend downward from the other end of the guided rod 84. The support frames 100 and 102 are spaced apart from each other, face each other, and are positioned parallel to each other. Minor shafts 104 and 106 are fixed so as to face each other at coaxial positions inside the support frames 100 and 102. Minor axis 104
Both ends of a cylindrical rotary shaft member 108 are rotatably fitted and supported on the shafts 106 and 106. Link members 110 and 112 are fixed and supported at both ends of the rotary shaft member 108 at the same position in the rotation direction. Link member 110
Is longer than the link member 112. Support pins 114 and 116, which are pin members, are projected and fixed at coaxial positions inside the link members 110 and 112 so as to face each other. Sliding plate member 9
The shaft means 0 comprises support pins 114 and 116. Both side plates 92 and 94 at the front end of the sliding plate member 90 are rotatably supported by these support pins 114 and 116, respectively.

Support frame 100 for the side frame 76
Is provided with level adjusting means for the sliding plate member 90, which supports the tip of the link member 110 and can move the position of the tip in the vertical direction. The level adjusting means is engaged with the level adjusting bolt 118 supported by the support frame 100 so as to be rotatable about the vertical axis and not movable in the axial direction, and the thread portion of the level adjusting bolt 118, and interferes with the support frame 100. Level adjusting nut 120 positioned so as not to rotate and the level adjusting nut 12 so as to project inward in the width direction in the horizontal direction.
Level adjustment pin 122 provided at 0.
The level adjusting pin 122 is rotatably fitted in a hole formed at the tip of the link member 110. More specifically, at the rear end portion of the support frame 100, a frame body 124 made of a channel type block member when viewed from the side.
Has been fixed. A level adjusting bolt 118 is rotatably supported on a horizontal portion above the frame body 124. A screw is formed in a portion of the level adjusting bolt 118 located in the channel portion (space portion), and the level adjusting nut 120 is engaged with this screw portion. The level adjusting nut 120 has a square cross section, and one side portion (one side portion) of the level adjusting nut 120 is the frame body 12.
4 is in contact with the upright wall portion. Level adjustment pin 122
Protrudes inward in the width direction from one side of the level adjusting nut 120. When the level adjustment bolt 118 is rotated,
The level adjustment nut 120 moves up and down along the level adjustment bolt 118. This vertical movement is caused by the level adjustment nut 12
It is transmitted to the link member 110 via the level adjusting pin 122 of 0. The link member 110 rotates about the minor shafts 104 and 106 via the rotary shaft member 108. The other link member 112 fixed to the rotary shaft member 108 also rotates at the same time. As a result, the support pins 114 and 116 fixed to the link members 110 and 112 are moved up and down, so that the front end of the sliding plate member 90 is moved up and down, and the level of the sliding plate member 90 is adjusted. According to the above configuration,
Since the level of the sliding plate member 90 is adjusted by simply rotating one level adjusting bolt 118, the level adjusting work is extremely easy and the work efficiency is high.

The sliding plate member 90 may be provided with a well-known heating burner 90a if necessary. When the sliding plate member 90 is provided with the heating burner 90a, the temperature of the bottom surface of the sliding plate member 90 can be increased, so that a good paved road surface can be obtained according to the temperature of the composite material 3 and the environment. . The sliding plate member 90 can also be provided with a well-known vibrator 90b as required. When the vibrator 90b is provided on the sliding plate member 90, the sliding plate member 90 can be vibrated, so that the degree of compaction of the paved road surface can be increased. If necessary, a weight (not shown) can be added to the sliding plate member 90. When weight is added to the sliding plate member 90,
Compaction by the sliding plate member 90 can be supported.

Next, the operation of the screed device 52 configured as described above (mainly the operation relating to the present invention) will be described. For the same reason as above, the operation of the expandable section screed 54 and the expandable section widener 58 will be described. Referring to FIG. 2, when the expander-widener 58 is not widened, the expander-widener 58 is positioned so as to be substantially accommodated in the structure of the expandable-section screed 54 ((A) of FIG. 2).
Position). When expanding the width, the screed 54
Is moved outwardly in the width direction (leftward in FIG. 2) together with the expansion / contraction widener 58 by a known expansion / contraction device, and is positioned at a predetermined position (position shown in FIG. 2B). Next, pressure oil is supplied to one chamber (not shown) which is divided by the piston in the hydraulic cylinder 64 of the expansion / contraction part screed 54, and the piston rod 62 is moved outward in the width direction. Since the side frame 76 of the expansion / contraction widener 58 is moved outward in the width direction, the guided member 79 of the expansion / compression widener 58 is moved in the same direction along the guide groove 68 of the guide member 66 of the expansion / contraction screed 54, The guided rod members 80, 82 and 84 of the expansion / contraction widener 58 are moved in the same direction along the corresponding guide members 70, 72 and 74 of the expansion / contraction screed 54. The deflector 78 whose one end is connected to the side frame 76 is moved outward in the width direction along the front surface of the deflector 17 of the expansion / contraction part screed 54. The sliding plate member 90 is also moved integrally with the side frame 76 and the guided rod member 84 (FIG. 2).
(C) position). Of the expansion / contraction widener 58,
The amount of movement with respect to the expansion / contraction part screed 54 is determined according to the required construction width.

The pavement road surface is formed by the expander / contractor widener 58 so that the composite material 3 discharged onto the road surface by the conveyor screw 10 is first spread by the deflector 78 to a uniform height, and then on the rear part of the deflector 78. It is performed by further laying it out by the sliding plate member 90 located. The height of the lower end of the deflector 78 is set to a position higher than the minimum ground clearance of the sliding plate member 90. Reference symbol R in FIG. 3 indicates a road foundation, and reference symbols L1 and L2 indicate paved road surfaces leveled by the main screed 14 and the expansion / contraction part screed 54, respectively, and are finished to have substantially the same height. Further, reference numeral L3 is an expander / contractor widener 5.
8 shows the paved road surface leveled by the deflector 78, and the symbol L4 indicates the paved road surface leveled by the sliding plate member 90. After the paving of the road surface is completed, pressure oil is supplied to the other chamber (not shown) in the hydraulic cylinder 64 of the expansion / contraction screed 54, and the piston rod 62 moves inward in the width direction (see FIG. 2).
To the right of). The expansion / contraction part widener 58 is moved inward in the width direction opposite to the above direction, and is positioned so as to be substantially accommodated in the structure of the expansion / contraction part screed 54 (the position shown in FIG. 2B). Next, the expandable section screed 54
Is moved inward in the width direction together with the expansion / contraction widener 58 by a known expansion / contraction device, and is positioned at a non-widening position (position shown in FIG. 2A). In this way, since the expansion and contraction of the construction width of the expansion and contraction widener 58 with respect to the expansion and contraction screed 54 is performed by the operation of the hydraulic cylinder 64, there is almost no burden on the operator in the expansion and contraction work of the construction width, and the work efficiency is significantly improved. To do.

A guide member 66 for the retractable screed 54.
Is provided so as to be vertically movable with respect to the deflector 17 of the elastic portion screed 54, and the deflector 78 of the elastic portion widener 58 is vertically movable with respect to the side frame 76. That is, by operating the bolt 67 of the guide member 66 and the bolt 76c of the support plate 78a,
The vertical position of the deflector 78 is adjusted.

FIG. 5 shows an embodiment in which the connecting member for supporting the rear end of the sliding plate member 90 comprises a turnbuckle 130 instead of the chain 98. Since other configurations are substantially the same as those shown in FIGS. 1 to 4, the same parts are designated by the same reference numerals. The turnbuckle 130 constitutes an inclination adjusting means capable of adjusting the longitudinal inclination of the sliding plate member 90 by adjusting the length thereof. When the turnbuckle 130 is operated to change its axial length, the sliding plate member 90 moves to the support pin 114.
And 116 (see FIG. 4). As a result, the inclination of the sliding plate member 90 in the front-back direction is adjusted. The turnbuckle 130 may be a well-known turnbuckle. According to the above configuration, since the tilt of the sliding plate member 90 in the front-rear direction is adjusted by merely rotating one turnbuckle 130, the tilt adjustment work is extremely easy and the work efficiency is high. . Further, by using it in combination with the level adjusting means, the road surface that matches the conditions of the composite material 3 is paved, and the accuracy of the road surface is improved.

FIG. 6 shows another embodiment of the second guide means provided on the expandable section screed 54 and the second guided means provided on the expandable section widener 58.
Since other configurations are substantially the same as those shown in FIGS. 1 to 4, the same parts are designated by the same reference numerals. The second guide means is composed of two cylindrical guide members 140 and 142 that extend in parallel to the width direction, and the second guided means has two circular cross sections that extend in parallel to the width direction. It is composed of guided rod members 144 and 146. The guided rod member 144 is the guide member 1.
40 is movably fitted and supported, and the guided rod member 146 is movably fitted and supported by the guide member 142. As is clear from comparison with FIG. 3, the positions of the guide member 140 and the guided rod member 144 are located at the same positions as the hydraulic cylinder 64 of FIG. 3, and the positions of the guide member 142 and the guided rod member 146 are Schematic 3
The guide member 74 and the guided rod member 84 are positioned at the same position. The hydraulic cylinder 64 is positioned at the same position as the guide member 72 and the guided rod member 82 shown in FIG. The configuration of FIG. 6 is a form in which the guide member 70 and the guided rod member 80 in FIG. 3 are omitted as compared with the configuration of FIG. 3, and therefore the configuration is simplified accordingly.

FIG. 7 shows the expansion / contraction widener 5 shown in FIG.
8 is an example in which the sliding plate member 90 is removed. Due to this, the rear portion (the right portion in FIG. 7) of the side frame 76 from the projecting portion 77 is deleted. In the case of this embodiment, the vertical position of the deflector 78 is adjusted by the above-mentioned operation,
The height of the lower end is made to coincide with the height of the rear end of the base plate member 31 of the expansion / contraction screed 54 to make the pavement thickness of the road surface equal, or the paved road surface L3 of the deflector 78.
It is preferable that the pavement road surface thickness after rolling is made uniform by adding a certain amount of excess to the extent that the expansion part screed 54 has a lower degree of compaction than the paved road surface L2. It should be noted that this form is mainly used when the pavement finishing surface accuracy is not so required as compared with the form in which the sliding plate member 90 is attached.

Although the present invention has been described in detail based on the embodiments above, the present invention is not limited to the above embodiments, and various modifications or alterations can be made within the scope of the present invention. is there.

[0031]

According to the screed device for pavement machine constructed according to the present invention, in the work of expanding and contracting the construction width, the auxiliary screed is manually attached to and detached from the screed of the expandable part or other auxiliary screed as in the conventional case. Since it is not necessary to do so, the burden on the worker in the telescopic work can be almost eliminated, and the working conditions are improved. Further, since the expansion / contraction part widener is provided in the expansion / contraction part screed, and the expansion / contraction part widener is moved outward in the width direction from the expansion / contraction part screed by the hydraulic cylinder, the expansion / contraction work efficiency of the construction width is significantly increased.

[Brief description of the drawings]

FIG. 1 is a schematic top view showing an embodiment of an asphalt finisher equipped with a screed device constructed according to the present invention.

2 is a schematic plan view for explaining the screed device shown in FIG. 1 together with its operation.

FIG. 3 is a view taken in the direction of arrow B in FIG. 2;

FIG. 4 is a schematic cross-sectional view taken along the line AA of FIG.

5 is a view similar to FIG. 3 showing another embodiment of the screed device constructed according to the present invention.

FIG. 6 is a view showing still another embodiment of the screed device constructed according to the present invention and is similar to FIG.

FIG. 7 is a view showing still another embodiment of the screed device constructed according to the present invention and is similar to FIG. 3.

FIG. 8 is a schematic top view showing an asphalt finisher equipped with a conventional screed device.

FIG. 9 is a sectional view taken along the line BB of FIG. 8;

10 is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

 3 compound material 4 hopper 8 bar conveyor 10 conveyor screw 14 main screed 17 and 19 deflector 52 screed device 54 and 56 expansion / contraction part screed 58 and 60 expansion / contraction part widener 62 piston rod 64 hydraulic cylinder 66 guide member 67 bolt 68 guide groove 70, 72 And 74 Guide member 76 Side frame 78 Deflector 80, 82 and 84 Guided rod member 90 Sliding plate member 91 Base plate member 98 Chain 108 Rotating shaft member 110 and 112 Link member 114 and 116 Support pin 118 Level adjusting bolt 120 Level adjusting nut 130 Turtle buckle

 ─────────────────────────────────────────────────── ───Continued from the front page (56) References JP-A-7-102521 (JP, A) JP-A-7-119113 (JP, A) Actually opened 58-194207 (JP, U) Actually opened 56- 100508 (JP, U) Actually open Sho 53-18832 (JP, U) Japanese Patent Sho 53-23144 (JP, B2)

Claims (6)

(57) [Claims] 1. A screed of a paving machine, comprising: a main screed arranged in a widthwise central portion; and a pair of elastic portion screeds arranged at a rear portion of the main screed and movably outward in the widthwise direction. In the device, each of the elastic section screeds is provided with an elastic section widener, and each of the elastic section screeds is provided with a deflector arranged at a front end portion, a first guide means provided on the deflector, and the deflector. A second guide means provided at the rear of the vehicle and a hydraulic cylinder including a piston rod, and each of the expander / contractor wideners has a side frame provided at the outer end in the width direction and extending in the front-rear direction, and a front end. And a first deflector provided on the deflector, the deflector being disposed at a portion and having one end connected to the side frame.
And a second guided means provided at the rear of the deflector and having one end connected to the side frame, wherein each of the expandable / contractible wideners has the first guided means. By being movably supported by the first guide means, the second guided means being movably supported by the second guide means, and by further connecting the side frame to one end of the piston rod, The expander screed is movably supported outward in the respective width directions, and the deflector of each expander widener is moved along the front surface of the deflector of each expander screed. A screed device for a paving machine, the position of which is specified so that 2. Each of the first guide means is provided so as to be vertically movable with respect to each of the deflectors of each of the elastic section screeds, and each of the deflectors of each of the elastic section wideners is provided with respect to each of the side frames. It was provided to move up and down,
The screed device for a paving machine according to claim 1. 3. A sliding plate member extending in the width direction is provided at a position rearward of the deflector in each of the expanding and contracting wideners, and a front end portion of each of the sliding plate members is provided in each of the expanding and contracting wideners. It is rotatably supported by the shaft means,
The screed device for a paving machine according to claim 1 or 2, wherein a rear end of each of the sliding plate members is supported by being connected to each of the expander / contractor wideners by a connecting member. 4. The paving machine according to claim 3, wherein each of the connecting members includes a tilt adjusting means configured to adjust a longitudinal tilt of each of the sliding plate members by adjusting a length thereof. Screed device. 5. A support frame is provided at each of a rear end portion of the side frame and the other end of the second guided member, and a rotary shaft member is provided between the support frames. Link members are respectively supported at the same position in the rotational direction on both ends, and the shaft means is composed of pin members provided on each of the link members and having a common axis line. Both sides of the front end of the sliding plate member are rotatably supported, and one end of the link member is supported by the support frame of the side frame and the position of the end can be moved in the vertical direction. The screed device for a paving machine according to claim 3 or 4, further comprising level adjusting means for the sliding plate member. 6. The level adjusting means is engaged with a level adjusting bolt supported by the support frame so as to be rotatable about a vertical axis and not movable in the axial direction, and a threaded portion of the level adjusting bolt. The level adjusting nut is positioned so as not to rotate by interfering with the support frame, and the level adjusting pin provided on the level adjusting nut so as to project in the horizontal direction. The level adjusting pin includes one of the one of the link members. The screed device of the paving machine according to claim 5, which is connected to the tip portion.