JPS633906Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a traveling device for an asphalt finisher.

An asphalt finisher that applies pavement to a road surface has a screed at the rear of the tractor that spreads the composite material to a predetermined paving width and a screed that finishes the scattered composite material to a desired thickness and uniformity. by the way,
When performing paving work with an asphalt finisher,
In order to maintain a good finished surface depending on the thickness of the paving, it is necessary to control the positional relationship with the tip of the screed by changing the height of the screed. For this reason, conventionally the height of the screw itself was adjusted independently depending on the pavement thickness, but
Adjustment is extremely troublesome, and adjustments must be made frequently during work, which hinders improvement in paving work efficiency.

Furthermore, when loading an asphalt finisher onto a transport vehicle, the conventional asphalt finisher was hit by the screws and screeds, which caused the inconvenience that loading work could not be carried out quickly.

This idea was created in view of the above points, and by making the height of the rear of the tractor variable while ensuring the crawler's close contact with the road surface, it improves running performance during paving work. To provide a traveling device for an asphalt finisher that can freely set the height of the screw while maintaining the same height, and can quickly load the asphalt finisher by climbing a slope with a large inclination angle when loading. The purpose is to

Therefore, in order to achieve this purpose, this invention includes a screw that is fixed to the rear of the tractor and spreads the mixture over a predetermined pavement width, and a screw that is attached to the tractor so that it can move up and down behind the screw. A screed is attached to the rear of the tractor to finish the spread material to a predetermined thickness, a crawler is attached to the starting wheels and idler wheels provided at the front and rear of the main frame of the tractor, and is driven, and one end of the screed is attached to the rear of the main frame. an operating link rotatably attached to one side; a balance arm having a central portion rotatably attached to the other end of the operating link; and a crawler rotatably attached to each end of the balance arm. a movable roller that engages with the ground side of the main frame, and a cylinder bottom side rotatably attached to the rear of the main frame,
The present invention is characterized by comprising a hydraulic cylinder whose rod tip is rotatably attached to the operation link.

This invention will be explained below with reference to an illustrated embodiment.

As shown in FIGS. 1 and 2, the asphalt finisher has a hopper H at the front of the tractor 1 into which mixed material is fed, and a hopper H at the rear of the tractor.
It has a screed S that spreads the mixed material sent from the hopper H over a predetermined pavement width, and a screed D that can be moved up and down by a leveling arm and finishes the spread material to a uniform thickness. At the rear of the main frame 2 of the tractor 1, there are left and right starting wheels 3, 3.
However, left and right idlers 4, 4 are provided at the front, and crawlers 5, 5 are mounted between the starting wheels 3, 3 and the idlers 4, 4, respectively.

Support shafts 6, 6 are fixed to the main frame 2 at positions near the idler wheels 4, 4 and protrude laterally, and arms 7, which have different arm lengths, are attached to the support shafts 6, 6. 7 is rotatably fitted. Rolling wheels 8, 8 are attached to the front ends of the arms 7, 7, and support shafts 9, 9 are fixedly attached to the rear ends of the arms 7, 7. Balance arms 10, 10 are attached to the support shafts 9, 9.
are each fitted in a rotatable manner. Rolling wheels 11 and 12 are attached to each of the balance arms 10 and 10, and the left and right rolling wheels 11 and 12 and the rolling wheel 8 are engaged with the grounding sides of the crawlers 5 and 5.

Further, the main frame 2 includes a starting wheel 3,
Fixed shafts 13, 13 are fixedly provided at positions near 3, projecting laterally, and one ends of operating links 14, 14 are rotatably attached to the fixed shafts 13, 13. Further, support shafts 15, 15 are fixedly provided on the other end sides of the operation links 14, 14 so as to protrude laterally.
is rotatably fitted in the center thereof, and movable wheels 17, 18 are rotatably provided at both front and rear ends of each balance arm 16, 16, respectively. Note that the rollers 17 and 18 are the crawlers 5 and 5.
is engaged with the ground side of the The cylinder bottom sides of left and right hydraulic cylinders 19, 19 are fixed to the main frame 2 of the tractor 1 via pins 19a, 19a as operating means for the movable wheels 17, 18. The tip of the rod connects to the bracket 14a at the center of the operation link 14, 14 through the pin 19b, 19b.
14a. The hydraulic cylinders 19, 19 can be extended and contracted from the driver's seat by a hydraulic control device (not shown) installed in the tractor 1.

Therefore, when the hydraulic cylinders 19, 19 are contracted, the tractor 1 is moved to the left and right wheels 8, 1.
1 and 12 and movable wheels 17 and 18.

The effect of the above configuration will be explained next.

First, when performing paving work, a mixture of Hoppa H is sent to the rear side of the tractor 1 and is spread by a screw S over a predetermined paving width. Then, the screed D is moved up and down to set a predetermined pavement thickness M, and the spread material is finished with the pavement thickness M by the screed D. By the way, at this time,
The height L of the screw S depends on the size of the above pavement thickness M.
It is necessary to change the position of the screed D and control the positional relationship with the tip of the screed D to obtain a good paved surface. Therefore, as shown in Fig. 4, the hydraulic cylinder 1
Extend 9 and 19. That is, the operation link 14,
14 is the fixed shaft 13, 13 on the main frame 2 side.
It rotates counterclockwise in the drawing centering on the movable roller 1.
7 and 18 are pushed down against the asphalt finisher's own weight to relatively raise the rear vehicle height of the tractor 1 and press the crawler 5 against the road surface.

That is, as the starting wheel 3 side of the main frame 2 having the starting wheel 3 and the idler wheel 4 to which the crawler 5 is attached rises, the vehicle height at the rear of the vehicle body increases, and the height of the screw S changes from the standard height L to a predetermined level. is increased to the height _L2 , but the length of contact of the crawler 5 with the road surface is maintained. Therefore, by adjusting the screed D by moving it up and down, the positional relationship between the newly set height of the screed S and the tip of the screed D can always be controlled, that is, kept constant, as shown in FIG. From the above, in paving work,
By changing the vehicle height at the rear of the vehicle body while maintaining driving performance, the height of the screw S can be easily set to maintain a good pavement finish depending on the size of the predetermined pavement thickness M. Rework can be reduced.

Next, as shown in FIG. 6, when the paving work is finished and the asphalt finisher is to be loaded onto the transport vehicle, the hydraulic cylinders 19, 19 are fully extended and the movable wheels 17, 18 are placed on the tractor 1. After raising the height of the rear of the tractor 1 by pushing down on the other hand and raising the height of the screed S and the screed D,
If the asphalt finisher is moved backwards, the screw S can be used even on the loading platform where the loading angle θ cannot be made small.
And the screed D can be quickly loaded onto the carrier without hitting the loading platform.

In addition, in any of the above cases, the hydraulic cylinder 1
9 and 19 are extended and the height of the rear portion of the tractor 1 is raised, the front portion of the tractor 1 is lowered.

As explained above, according to the present invention, a crawler-type traveling device for an asphalt finisher has a basic configuration in which a crawler is provided with a screed and a screed, and a crawler is wound around a starting wheel and an idler wheel provided at the front and rear of a main frame. In this, two rolling wheels that engage with the ground side of the crawler are swingably provided at the rear end of the main frame via an operation link and a balance arm, and a hydraulic cylinder provided between the main frame and the operation link By forcibly pressing the wheels toward the ground side of the crawler, the rear part of the main frame can be raised to an arbitrary height. Therefore, during paving work, the height of the screw can be set freely while keeping the crawler in secure contact with the road surface, so it is possible to maintain a good pavement finish depending on the thickness of the pavement, improving the quality of the pavement. This has the effect of increasing the efficiency of work, and also has the effect of allowing the screws and screeds to be loaded quickly without getting in the way when loading onto a transport vehicle.

[Brief explanation of drawings]

FIG. 1 is a side view showing an asphalt finish equipped with an embodiment of the traveling device according to the invention, FIG. 2 is a plan view showing the traveling device of the same asphalt finish, and FIG. 3 is a hydraulic FIG. 4 is an explanatory diagram showing a state in which the cylinder is contracted. FIG. 4 is an explanatory diagram showing a state in which the hydraulic cylinder is extended and the rear vehicle height of the tractor is raised. FIG. 5 is an explanatory diagram showing the positional relationship between the screed and the screed. FIG. 6 is an explanatory diagram showing a state in which an asphalt finisher is loaded onto a transport vehicle. 5...Crawler, 14...Operation link, 16...
... Balance arm, 17, 18... Movable roller, 19...
...Hydraulic cylinder, S...Screed, D...Screed.

Claims (1)

[Scope of utility model registration request] A screw that is fixed to the rear of the tractor and spreads the mixture to a predetermined pavement width, and a screw that is attached to the rear of the tractor so that it can move up and down behind the screw and finishes the spread mixture to a predetermined thickness. a screed, a crawler that is driven by being attached to a starting wheel and an idler wheel provided at the front and rear of the main frame of the tractor, an operation link whose one end is rotatably attached to the rear of the main frame, and the operation link. a balance arm whose central portion is rotatably attached to the other end of the link; movable wheels rotatably attached to both ends of the balance arm and engaged with the ground side of the crawler; and the main frame. 1. A traveling device for an asphalt finisher, comprising: a hydraulic cylinder whose cylinder bottom side is rotatably attached to the rear part of the hydraulic cylinder, and whose rod end is rotatably attached to the operation link.