JP2005248577A - Support device for work step of paving machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support device for a work step of a paving machine, which protects the operator so as to be hardly affected by vibrations of a screed. <P>SOLUTION: According to the structure of the support device for the work step, one end of a support bracket 17 which has the work step 16 mounted thereon so as to be separate from the screed 13, is mounted on a side surface of the screed 13 in a manner rotatable upward and downward, and a vibration control member 20 for expanding/contracting according to vibrations of the screed is interposed between the screed 13 and the support bracket 17. Thus the vertical vibrations of the screed 13 are absorbed by the expansion/contraction of the vibration control member 20, and therefore rotation of the support bracket 17 with respect to the screed 13 is inhibited, to thereby suppress the vibrations transmitted from the screed 13 to the work step 16. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a support device for a work step of a paving machine, and particularly to a support device for a work step provided at the rear portion of a screed.

Conventionally, this type of paving machine has a hopper for receiving asphalt mixture at the front part of the vehicle body, and extends a leveling arm from both sides of the vehicle body to the rear, and the screed is attached to the rear end of the leveling arm. The side is attached. Further, a work step is fixed to the rear part of the screed so that the worker can work while riding on the step while watching the paved state (see, for example, Patent Document 1).
JP-A-11-140816.

  In general, a paving machine performs leveling work while applying vibration to the screed to improve compaction of the asphalt mixture. Since the conventional step is fixed to the rear part of the screed, the vibration is transmitted to the work step and the worker is directly subjected to the vibration. This vibration causes fatigue on the worker's body and causes a long time. The work is difficult.

  Thus, there is a technical problem to be solved in order to provide a work step support device that is difficult for an operator to be affected by the screed vibration, and the present invention aims to solve this problem. .

  The present invention has been proposed to achieve the above object, and the invention according to claim 1 extends a pair of left and right leveling arms from both sides of the vehicle body toward the rear, and between the rear ends of the leveling arms. In a paving machine equipped with a screed, a pair of left and right support brackets, one end of which is rotatably attached to the side surface of the screed and the other end extends toward the rear of the screed, A work step that is separated from the screed and attached between the other ends of the pair of support brackets, and is provided between the screed and the support bracket so as to be stretchable and absorbs vibration in the vertical direction of the screed by the stretch. And a vibration damping member for restricting the rotation of the support bracket with respect to the screed, and a work step support device in a paving machine. That.

  The work step is arranged away from the screed, and the control step is configured to absorb the screed vibration and regulate the rotation of the support bracket relative to the screed due to the vertical vibration of the screed between the screed and the support bracket. A vibration member is provided. That is, when the screed vibrates in the vertical direction, the vibration damping member expands and contracts along with this vibration to absorb the vibration of the screed, and the support bracket tries to repeatedly rotate in the vertical direction with the attachment portion with the screed as a fulcrum. Therefore, the vibration transmitted from the screed to the work step is reduced.

  According to a second aspect of the present invention, there is provided an auxiliary damping member that is provided between the work step and the support bracket so as to be stretchable and absorbs vibration in the vertical direction of the work step relative to the support bracket by the stretch. A support device for a working step in a paving machine according to claim 1 is provided.

  In addition to the damping member provided between the screed and the support bracket, an auxiliary damping member is also provided between the support bracket and the work step. In this auxiliary vibration damping member, when vibration from the screed side is transmitted to the support bracket side without being restricted by the vibration damping member between the screed and the support bracket, the vibration transmitted to the support bracket side is It is absorbed by expansion and contraction of an auxiliary vibration damping member provided between the support bracket and the work step. Therefore, vibration from the screed side is absorbed by both the vibration damping member provided between the screed and the support bracket and the auxiliary vibration suppression member provided between the support bracket and the work step. Will be reduced.

  According to the first aspect of the present invention, the vibration transmitted from the screed to the work step side can be absorbed and reduced by the damping member provided between the screed and the support bracket. Therefore, the worker who is on the work step is not easily affected by the screed vibration, can prevent the worker from being fatigued by the vibration, and can work for a long time. Further, a complicated vibration isolator is unnecessary, and vibration can be prevented at a low cost with a simple configuration.

  According to the second aspect of the present invention, in addition to the vibration absorption by the vibration damping member provided between the screed and the support bracket, the vibration by the auxiliary vibration damping member provided between the support bracket and the work step is also provided. Since absorption is also obtained, in addition to the effect of the invention according to claim 1, the worker who is on the work step becomes more difficult to receive the vibration of the screed. Work becomes possible.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. For the purpose of making it difficult for the operator to be affected by the screed vibration, one end of the support bracket on which the work step is mounted away from the screed is attached to the side surface of the screed so as to be rotatable in the vertical direction. A damping member that expands and contracts with the vibration of the screed is interposed between the support bracket and the support bracket, and the vibration of the screed in the vertical direction is absorbed by the expansion and contraction of the damping member to restrict the rotation of the support bracket with respect to the screed. Realized by doing.

  1 to 3 show an asphalt finisher 10 as an example of a paving machine. A hopper 12 is arranged at the front of a vehicle body 11, and the asphalt mixture put into the hopper 12 is backed by a bar conveyor (not shown). To the road surface from the rear portion of the vehicle body 11 and spread by the screed 13 to a uniform thickness. Reference numeral 14 denotes left and right drive wheels, which are driven by a hydraulic motor (not shown).

  Leveling arms 15 extend rearward from the left and right sides of the vehicle body 11, and the outer surface of the screed 13 is mounted between the rear ends of the pair of left and right leveling arms 15. A work step 16 is attached to the rear portion of the screed 13 via a pair of left and right support brackets 17, 17 provided on the left and right sides of the screed 13.

  4 to 6 show details of the structure in which the work step 16 is supported on the screed 13 via the support bracket 17. In order to simplify the description, only one side (left side) structure is shown.

  In the working step support structure shown in FIGS. 4 to 6, the support bracket 17 is made of an elongated plate-like member. The front end 17a side of the support bracket 17 is attached to the outer surface of the screed 13 so as to be rotatable in the vertical direction using a shaft-shaped locking member 22. On the other hand, the rear end 17 b side of the support bracket 17 extends straight toward the rear of the screed 13.

  Further, on the front end 17 a side of the support bracket 17, the horizontal plate extends in a right angle outward from the side surface of the support bracket 17 and extends straight forward along the side surface of the screed 13. The portion 17c is fixed. Note that the horizontal plate is formed on the side surface of the screed 13 above the front end portion of the horizontal plate portion 17c so as to extend in parallel with the front end portion of the horizontal plate portion 17c from the side surface of the screed 13 to the outside. 19 is fixed. A damping member 20 is provided between the upper surface of the horizontal plate portion 17 c and the lower surface of the horizontal plate 19. The damping member 20 here is, for example, a coil spring or a vibration-proof rubber having low rigidity (spring constant).

  On the other hand, a horizontal plate portion 17d is formed on the rear end 17b side of the support bracket 17 so as to extend from the upper side surface of the support bracket 17 at a right angle inward. A work step 16 is placed on the upper surface of the horizontal plate portion 17d via an auxiliary damping member 21, and the work step 16 is mounted on the horizontal plate portion 17d in a state separated from the screed 13. ing. The auxiliary vibration damping member 21 here is, for example, a coil spring or a vibration-proof rubber having a low rigidity (spring constant), like the vibration damping member 20.

  Next, the operation of the working step support structure configured as described above will be described. When the screed 13 vibrates up and down, the vibration damping member 20 expands and contracts along with the vibration to absorb the vibration of the screed 13, and the support bracket 17 tries to repeatedly rotate up and down with the locking member 22 as a fulcrum. The movement, that is, the movement that becomes the vibration is regulated, and the vibration transmitted from the screed 13 side to the work step 16 side is suppressed.

  Further, the auxiliary vibration damping member 21 expands and contracts with the vibration of the support bracket 17 when the vibration from the screed 13 side is not completely restricted by the vibration damping member 20 and the support bracket 17 is vibrated. Then, the vibration of the support bracket 17 is absorbed by the expansion and contraction of the auxiliary vibration damping member 21 and the vibration transmitted from the support bracket 17 to the work step 16 is suppressed.

  Therefore, in the paving machine configured as described above, the vibration transmitted from the screed 13 to the work step 16 side is controlled by the vibration damping member 20 between the screed 13 and the support bracket 17, the support bracket 17, and the work step 16. This is absorbed and reduced by both members of the auxiliary damping member 21 between them. As a result, the worker who is on the work step 16 is less likely to receive the vibration of the screed 13, can prevent the worker from being fatigued by the vibration, and can work for a long time.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The side view of the asphalt finisher which attached the work step. The top view of the asphalt finisher which attached the work step. The rear view of the asphalt finisher which attached the work step. The perspective view of a work step support structure. The side view of the work step support structure. FIG. 6 is a cross-sectional view taken along the line AA in FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Asphalt finisher 11 Car body 12 Hopper 13 Screed 15 Leveling arm 16 Working step 17 Support bracket 17a Front end 17b Rear end 17c Horizontal flat plate portion 18 Mounting member 19 Horizontal flat plate 20 Damping member 21 Auxiliary damping member

Claims (2)

In a paving machine in which a pair of left and right leveling arms are extended from both sides of the vehicle body to the rear, and a screed is mounted between the rear ends of the leveling arms,
A pair of left and right support brackets, one end of which is attached to the side surface of the screed so as to be pivotable in the vertical direction, and the other end is extended toward the rear of the screed;
A working step attached between the other ends of the pair of support brackets apart from the screed;
A damping member provided between the screed and the support bracket so as to be extendable and absorbing vibrations in the vertical direction of the screed by the expansion and contraction, and restricting the rotation of the support bracket relative to the screed;
And a support device for a work step in a paving machine.   2. The pavement according to claim 1, further comprising an auxiliary vibration damping member that is provided between the work step and the support bracket so as to be stretchable and absorbs the vibration in the vertical direction of the work step with respect to the support bracket by the stretch. Support device for working steps in machines.

Images