JP3929562B2 - Side shake prevention device for leveling equipment in asphalt finisher - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for preventing a leveling apparatus from swinging sideways when an asphalt finisher is forwarded or leveled.
[0002]
[Prior art]
An asphalt finisher is known in which a leveling device that divides a pair of left and right screeds into front and rear and bends up and down is suspended on a pair of leveling arms that are provided on both sides of the traveling vehicle. ing. In this asphalt finisher, when a gap is provided between the traveling vehicle and the leveling arm, the leveling arm can be moved up and down smoothly, and the pair of screeds are bent into a square shape to spread the crown on the road surface. The narrowing of the distance between the pair of leveling arms generated in the above is absorbed.
[0003]
[Problems to be solved by the invention]
In the above-mentioned asphalt finisher, the leveling device is lifted from the road surface by the lifting cylinder provided in the traveling vehicle and sent, but the above-mentioned gap provided for the purpose of smoothing the leveling work is adversely affected. In addition, there is a problem that the leveling device swings sideways when the asphalt finisher is steered or when the leveling device is lowered to the road surface to perform leveling work.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for preventing a horizontal run-out of a leveling device in an asphalt finisher that can prevent a horizontal run-out of the leveling device during asphalt finisher forwarding or leveling.
Another object of the present invention is to provide an apparatus for preventing a horizontal runout of a leveling device in an asphalt finisher that has a simple structure and can be easily applied to an existing asphalt finisher.
[0005]
[Means for Solving the Problems]
In order to achieve at least one of the above objects, an invention according to claim 1 is an asphalt finisher in which a leveling device is suspended on a pair of leveling arms provided vertically on both left and right sides of a traveling vehicle. A restraining means for restraining the lateral movement of the pair of leveling arms with respect to the traveling vehicle is provided between the traveling vehicle and at least one leveling arm, and the restraining means is disposed near the leveling device of the traveling vehicle and the leveling arm. The ball joints are attached to each other, and the connecting rods are connected to each other by connecting the ball joints to each other by screwing the threaded portions into the screw holes of the respective ball joints that are reversely threaded .
[0006]
With the above configuration, when lifting the leveling device and forwarding the asphalt finisher, the restraining means works to restrain the lateral movement of the pair of leveling arms relative to the traveling vehicle. Can be prevented. Even when the leveling device is lowered on the road surface, the restraining means works to restrain the horizontal movement of the pair of leveling arms relative to the traveling vehicle. The side shake of the device is prevented.
[0007]
Furthermore , it is possible to prevent the spread of the spreader with a simple structure, and it is easy to implement on an existing asphalt finisher.
[0008]
Further, the restraining means can be configured as a pair of restraining cylinders provided in the traveling vehicle so that the piston rods can be brought into contact with the leveling arms, respectively (claim 2 ). In this case, when the asphalt finisher is forwarded or leveled, the piston rods of the pair of restraining cylinders are brought into contact with the leveling arms to prevent the leveling device from sideways. At the time of leveling, at least one piston rod is separated from the leveling arm to release the restraint. With this structure, it is possible to more reliably prevent the spread of the spreader. It is preferable to form the tip of the piston rod is brought into contact with the leveling arm in a circle (claim 3).
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the invention will be described with reference to the drawings.
1 to 4 show an embodiment of the present invention. Reference numeral 1 denotes a traveling vehicle. The traveling vehicle 1 includes a steering wheel 2 and a driving wheel 3 and is driven by an operator who arrives at a driver's seat 4.
[0010]
A pair of leveling arms 6 are provided on both the left and right sides of the traveling vehicle 1 so as to be rotatable up and down around the pivot 7 at the front end with a gap g between the traveling vehicle 1 and the rear end. The spreader 8 is suspended. Each pivot 7 can be moved up and down by a vertical cylinder 9, and the attack angle of the spreader 8 can be adjusted by moving the pivot 7 up and down.
[0011]
The spreader 8 has a pair of left and right screeds 11. The pair of screeds 11 are provided separately at the front and rear with their positions shifted to the left and right so that they can be bent in the shape of a letter. The traveling vehicle 1 includes an asphalt composite hopper 12, a spreading screw 13 that spreads the asphalt composite sent from the hopper 12 by a bar feeder (not shown) on the road surface, and a leveling agent when the asphalt finisher is transported. A lifting cylinder 14 is provided for lifting the lifting device 8. The lifting cylinder 14 is omitted in FIGS.
[0012]
The structure of the asphalt finisher is well-known, and the asphalt mixture fed from the hopper 12 and spread on the road surface by the spreading screw 13 is spread by the screeds 11 and 11 of the spreader 8 and spread. The leveling device 8 can be lifted from the road surface by the lifting cylinder 14 and sent.
[0013]
Mounting seats 16 and 17 are provided on the rear surface of the traveling vehicle 1 and the inner surface of one leveling arm 6, and ball joints 18 and 19 are respectively attached to the mounting seats 16 and 17. Each of the ball joints 18 and 19 includes balls 20 and 21 having screw portions 20a and 21a, and sockets 22 and 23 having screw holes 22a and 23b and fitted into the balls 20 and 21, respectively. The threaded portions 20a and 21a of the balls 20 and 21 are screwed to the mounting seats 16 and 17, respectively, and are detachably attached to the mounting seats 16 and 17, respectively.
[0014]
The ball joints 18 and 19 are connected to each other by a connecting rod 25 in which screw portions 25a and 25b are screwed into screw holes 22a and 23b of the sockets 22 and 23, which are screwed in opposite directions.
[0015]
The ball joints 18 and 19 and the connecting rod 25 constitute a restraining means 26 to restrain the lateral movement of the pair of leveling arms 6 with respect to the traveling vehicle 1, and the traveling vehicle 1 of the leveling arm 6 to which the ball joint 19 is attached. The vertical movement with respect to is made free. The leveling arm 6 of the asphalt finisher shown in the figure moves from the state shown in FIG. 4 in which the connecting rod 25 of the restraining means 26 is leveled up to 250 mm in the suspended state of the spreader 8 and is lowered 250 mm. Although the leveling device 8 is lowered to the road surface, the leveling device 8 may be in a lifted or lowered state in FIG. 4 or a state close thereto.
[0016]
Next, the operation of the lateral shake prevention device of the spreader in the asphalt finisher having the above-described configuration will be described.
The asphalt mixture leveling operation is performed by lowering the leveling device 8 on the road surface and freely extending and retracting the lifting cylinder 14 and running the traveling vehicle 1.
At this time, the connecting rod 25 of the restraining means 26 freely moves up and down by the action of the ball joints 18 and 19, so that the original functions of the screeds 11 and 11 are not impaired by the restraining means 26 as in the past. Move up and down and level the asphalt mixture. The restraining means 26 prevents unnecessary swinging of the leveling device 8 in the left-right direction during leveling work.
[0017]
When the pair of screeds 11 and 11 are bent in a U-shape in order to apply a crown to the leveling road surface, the leveling arm 6 to which the ball joint 19 of the restraining means 26 is not attached (the upper leveling in FIG. 1). The arm 6) approaches the traveling vehicle 1 and narrows the distance between the leveling arms 6 and 6 according to the degree of bending of the screeds 11 and 11.
[0018]
When the asphalt finisher is forwarded, the spreader 8 is lifted by the lifting cylinder 14 in the same manner as in the prior art. At this time, the restraining means 26 bends at the ball joints 18 and 19 as the spreader 8 is raised. . Leveling with the ball joint 19 attached even if a lateral force (width direction of the traveling vehicle 1, vertical direction in FIG. 1) acts on the leveling device 8 by steering or the like when the asphalt finisher is forwarded. Since the restraining means 26 restrains the movement of the arm 6 in the right direction and the left direction relative to the traveling vehicle 1, the lateral shaking of the spreader 8 is prevented.
[0019]
FIG. 5 shows another embodiment of the present invention. In this figure, reference numeral 31 denotes a restraining cylinder made up of a hydraulic cylinder or an air cylinder. The restraining cylinder 31 is horizontally attached to the rear surface of the traveling vehicle 1 with a pair of left and right piston rods 31a arranged outside. Each constraining cylinder 31 makes the circular (including spherical) tip 31b of the piston rod 31a abut against the inner surface of each leveling arm 6 in the extended state, thereby moving the pair of leveling arms 6 in the raised state laterally. The restraint means 32 is configured.
[0020]
Since the structure of the main part of the asphalt finisher is the same as that of the asphalt finisher of FIGS. 1 to 4, the same reference numerals are assigned to the same members and the description thereof is omitted. In FIG. 5, the spreader is omitted.
[0021]
In the case of the asphalt finisher of FIG. 5, each constraining cylinder 31 is reduced so that the end 31 b of each piston rod 31 a is separated from each leveling arm 6, and the leveling device is lowered on the road surface. In addition, each restraining cylinder 31 is extended in a state where the spreader is lifted, and the tip 31b of each piston rod 31a is brought into contact with each leveling arm 6 and fed.
[0022]
Even when a lateral force is applied to the spreader by steering or the like when the asphalt finisher is transported, the horizontal swing of the spreader in either direction is prevented by the action of the pair of restraining cylinders 31. Become.
[0023]
The circular tip 31b of each piston rod 31a facilitates the vertical movement of the leveling arm 6 in contact therewith. For this reason, the leveling work can be performed with the tip 31b of one or both piston rods 31a lightly touching the leveling arm 6. Also in this case, unnecessary swinging of the spreader in the lateral direction is prevented.
[0024]
In addition to the spreader shown in the figure, there is known a spreader in which three screeds are shifted to the left and right and arranged in two stages in the front and rear. However, the present invention is also applicable to such spreader. Can be applied.
[0025]
【The invention's effect】
As described above, the invention according to claim 1 is an asphalt finisher in which a leveling device is suspended on a pair of leveling arms that are vertically provided on both left and right sides of a traveling vehicle. A restraining means for restraining the lateral movement of the pair of leveling arms with respect to the traveling vehicle is provided between the one leveling arm, and the restraining means are respectively attached to the vicinity of the leveling device of the traveling vehicle and the leveling arm. The length of the ball joints is adjustable by connecting the ball joints to each other by screwing the threaded portions into the threaded holes of the respective ball joints that are oppositely threaded. When the finisher is forwarded, it is possible to prevent the spread of the spreader.
[0026]
In addition , the structure is simple, which is advantageous in terms of cost and maintenance, and can be easily implemented on an existing asphalt finisher.
[0027]
Further, when the restraining means is configured as a pair of restraining cylinders provided in the traveling vehicle so that the piston rod can be brought into contact with each leveling arm, it is possible to more reliably prevent the spread of the spreading device. .
[Brief description of the drawings]
FIG. 1 is a plan view of an asphalt finisher showing an embodiment of the present invention.
FIG. 2 is a side view of the asphalt finisher of FIG.
FIG. 3 is a rear view of the asphalt finisher of FIG. 1;
FIG. 4 is a front view of the restraining means partially broken.
FIG. 5 is a rear view of an asphalt finisher showing another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Traveling vehicle 6 Leveling arm 8 Spreading device 11 Screed 18, 19 Ball joint 25 Connecting rod 26 Restriction means 31 Restriction cylinder 31a Piston rod 31b Tip 32 Restriction means g Crevice

Claims (3)

In an asphalt finisher in which a leveling device is suspended on a pair of leveling arms provided on both left and right sides of a traveling vehicle,
Between the traveling vehicle and at least one leveling arm, a restraining means for restraining lateral movement of the pair of leveling arms with respect to the traveling vehicle is provided ,
The restraining means includes a ball joint attached to each of the traveling vehicle and the leveling arm and the vicinity of the leveling arm, and a screw portion screwed into a screw hole of each ball joint that is reversely threaded to each other. An asphalt finisher with a connecting rod connected to each other . In an asphalt finisher in which a leveling device is suspended on a pair of leveling arms provided on both left and right sides of a traveling vehicle,
Between the traveling vehicle and at least one leveling arm, a restraining means for restraining lateral movement of the pair of leveling arms with respect to the traveling vehicle is provided,
Restraining means, the horizontal vibration preventing device of the sock leveling device in the feature and be luer scan Middelfart finisher that is a pair of restraining cylinder provided with a piston rod abutting freely vehicle to each leveling arm. 3. The apparatus according to claim 2, wherein the tip end of the piston rod brought into contact with the leveling arm is formed in a circular shape .

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