JP2005248579A - 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, elastic bodies 22a, 22b, 22c, 22d are arranged between the screed 13 and a front end 17a of a support bracket 17, for holding the position of the support bracket 17 at right angles to a guide bar 21 arranged on the screed 13. Thus vertical vibrations of the screed 13 are absorbed by expansion/contraction of the elastic bodies 22a, 22b, 22c, 22d to inhibit rotations of the support bracket 17 upward, downward, rightward, and leftward with respect to the screed 13, to thereby suppress vibrations transmitted from the screed 13 to the support bracket 17. <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 guide bar provided in the vertical direction at the rear part of the screed, a through hole on the front end side, and the guide bar is passed through the through hole, The front end side is slidably engaged with the guide bar in the vertical direction, and the rear end side is extended toward the rear of the screed, and is attached to the support bracket away from the screed. A work step, and a stretchable elastic body that holds the posture of the support bracket at a substantially right angle to the guide bar between the screed and the front end side of the support bracket. For example, to provide a supporting device in the working step to a paving machine which is adapted to vertical vibration of the screed absorbed by expansion and contraction of the elastic body.

  When the screed vibrates in the vertical direction, the guide bar moves up and down in the through hole while the elastic body expands and contracts, and the elastic body expands and contracts to absorb the vibration and keep the position of the support bracket in that position. The vibration transmitted to the support bracket from is controlled. Therefore, the vibration of the work step disposed on the support bracket away from the screed is also regulated together with the support bracket.

  According to a second aspect of the present invention, there is provided a work step for a paving machine according to the first aspect, wherein one end of the elastic body is pressed against the front end side of the support bracket from four directions, up and down and left and right. A support device is provided.

  The posture of the support bracket is always held at a substantially right angle with respect to the guide bar by the elastic body pressed against the front end side of the support bracket from four directions up and down and left and right, and the screed is vertically and horizontally The vibration is absorbed by the expansion and contraction of the elastic body.

  According to a third 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 the vibration in the vertical direction of the work step relative to the support bracket by the stretch. A work step support device for a paving machine according to claim 1 or 2 is provided.

  In addition to the elastic body 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 completely regulated by the elastic body between the screed and the support bracket, the vibration transmitted to the support bracket side is supported. It is absorbed by the expansion and contraction of the auxiliary vibration damping member provided between the bracket and the work step. Therefore, the vibration from the screed side is absorbed by both the elastic body provided between the screed and the support bracket and the auxiliary damping member provided between the support bracket and the work step. Will be reduced.

  According to the first aspect of the present invention, when the screed vibrates in the vertical direction, the guide bar moves in the vertical direction in the through hole while expanding and contracting the elastic body, and the position of the support bracket is held at that position. Since the movement with respect to the support bracket is restricted, vibration transmitted from the screed to the work step can be reduced. 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.

  Since the invention according to claim 2 holds the posture by pressing one end side of the support bracket with the elastic body from the four directions of up and down and left and right, in addition to the effect of the invention of claim 1, the support is supported from the screed side. In addition to the vertical vibration transmitted to the bracket side, the horizontal vibration can also be actively absorbed and reduced. As a result, the worker on the work step becomes more difficult to receive screed vibration.

  According to the third aspect of the present invention, in addition to the vibration absorption by the elastic body provided between the screed and the support bracket, the vibration absorption by the auxiliary vibration damping member provided between the support bracket and the work step. Therefore, in addition to the effects of the first or second aspect of the invention, the worker who is on the work step is more difficult to receive the screed vibration.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Stretchable to maintain the posture of the support bracket at a substantially right angle with respect to the guide bar provided on the screed side between the screed and the front end side of the support bracket, with the aim of making the operator less susceptible to screed vibration This is realized by providing a flexible elastic body, absorbing the vertical vibration of the screed by expansion and contraction of the elastic body, and restricting the vertical and horizontal rotation of the support bracket with respect to the screed.

  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 7 show details of the structure in which the work step 16 is attached to 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 7, the support bracket 17 is made of an elongated plate-like member. The support bracket 17 is disposed substantially horizontally with the plane faced up and down, and the front end 17 a side is attached to the rear end surface 13 a of the screed 13 using the attachment member 18, and the rear end 17 b side is behind the screed 13. It is extended straight towards.

  In addition, an engagement hole 19 penetrating vertically is provided on the front end 17a side of the support bracket 17, and vertical plate portions 17c and 17d are vertically fixed on both the left and right sides. doing. On the other hand, the work step 16 is attached to the upper surface on the rear end 17 b side of the support bracket 17 via the auxiliary vibration damping member 20 while being separated from the screed 13. The auxiliary vibration damping member 20 here is, for example, a coil spring or a vibration-proof rubber having low rigidity.

  The mounting member 18 includes a pair of upper and lower horizontal plate portions 18a and 18b, a pair of left and right vertical plate portions 18c and 18d, and a round bar-shaped guide bar 21. The pair of upper and lower horizontal plate portions 18 a and 18 b extend straight and parallel from the rear end surface 13 a of the screed 13 to the rear so as to be positioned above and below the front end 17 a of the support bracket 17. The pair of left and right vertical plate portions 18c and 18d are positioned on the left and right sides of the support bracket 17, and have the planes facing inward, and the vertical plate portions 17c and 17c of the support bracket 17 straight from the rear end surface 13a of the screed 13 to the rear. It extends in parallel with 17d. The guide bar 21 is a round bar-like member that passes through the engagement hole 19 of the support bracket 17 and has upper and lower ends fixed to the horizontal plate portion 18a and the horizontal plate portion 18b, respectively. A play is created between the guide bar 21 and the engagement hole 19, and the play allows the guide bar 21 to slide up and down in the engagement hole 19 and rotate in the horizontal direction. It is possible to move.

  The elastic bodies 22a and 22b are disposed in a compressed state between the horizontal plate portion 18a and the upper surface of the support bracket 17 and between the horizontal plate portion 18b and the lower surface of the support bracket 17, respectively. The support bracket 17 is held in a horizontally balanced posture by the inward pressing by the elastic body 22a and the inward pressing by the elastic body 22b. Further, the elastic bodies 22c and 22d are also arranged in a compressed state between the vertical plate portion 18c and the vertical plate portion 17c of the support bracket 17 and between the vertical plate portion 18d and the vertical plate portion 17d of the support bracket. ing. And the support bracket 17 is hold | maintained with the attitude | position balanced right and left by the press to the inner side by these elastic bodies 22c and the press to the inner side by the elastic body 22d. Accordingly, since the front end 17a side of the support bracket 17 is pressed and balanced by the elastic bodies 22a, 22b, 22c, and 22d in the four directions of up and down and left and right, the support bracket 17 is usually It is held in a posture that is perpendicular to the guide bar 21 at the same balanced position.

  The elastic bodies 22a, 22b, 22c, and 22d are, for example, a coil spring or a vibration-proof rubber having low rigidity, like the auxiliary 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 guide bar 21 moves up and down in the engagement hole (through hole) 19 with the expansion and contraction of the elastic bodies 22a to 22d, and the vibration is absorbed by the expansion and contraction of the elastic bodies 22a to 22d. Then, the position of the support bracket 17 is held at that position, the vibration transmitted from the screed 13 to the support bracket 17 is restricted, and the vibration transmitted from the screed 13 side to the work step 16 side is suppressed.

  Further, the auxiliary damping member 20 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 elastic bodies 22a to 22d and the support bracket 17 vibrates. Then, the vibration of the support bracket 17 is absorbed by the expansion and contraction of the auxiliary vibration damping member 20, and the vibration transmitted from the support bracket 17 to the work step 16 is suppressed.

  Therefore, in the paving machine configured in this way, when the screed 13 vibrates in the vertical direction, the guide bar 21 moves in the vertical direction in the engagement hole (through hole) 19 while the elastic bodies 22a to 22d expand and contract. Thus, the position of the support bracket 17 is held at that position, and the movement with respect to the work step 16 and the support bracket 17 is restricted, so that vibration transmitted from the screed 13 to the work step 16 can be reduced. As a result, the worker who is on the work step is unlikely to receive 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.

  In the structure of the present embodiment, the structure in which the auxiliary vibration damping member 25 is provided between the support bracket 17 and the work step 16 is disclosed. However, this is not always necessary, but the auxiliary vibration damping member 25 is provided. Is provided, the vibration from the screed 13 side is absorbed by both the elastic bodies 22a to 22d and the auxiliary damping member 25, and the vibration can be further reduced.

  In addition, 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 one.

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 seen from the arrow A direction of FIG. The top view of the work step support structure. FIG. 7 is a cross-sectional view taken along the line B-B in FIG. 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Asphalt finisher 11 Car body 13 Screed 15 Leveling arm 16 Working step 17 Support bracket 17a Front end 17b Rear end 17c Vertical plate portion 17d Vertical plate portion 18 Mounting member 18a Horizontal plate portion 18b Horizontal plate portion 18c Vertical plate portion 18d Vertical plate portion 19 Engagement hole 20 Auxiliary vibration damping member 21 Guide bar 22a-22d Elastic body

Claims (3)

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 guide bar provided at the rear part of the screed in the vertical direction;
There is a through hole on the front end side, the guide bar is passed through the through hole, the front end side is slidably engaged with the guide bar in the vertical direction, and the rear end side is connected to the screed. A support bracket extending rearward,
A working step attached to the support bracket away from the screed;
A stretchable elastic body that holds the posture of the support bracket substantially perpendicular to the guide bar between the screed and the front end side of the support bracket;
An apparatus for supporting a working step in a paving machine, wherein the vertical vibration of the screed is absorbed by expansion and contraction of the elastic body.   2. The support device for a working step in a paving machine according to claim 1, wherein one end of the elastic body is pressed against the front end side of the support bracket from four directions, up and down and left and right.   3. The auxiliary damping member is provided between the work step and the support bracket so as to be extendable and retractable, and absorbs vibration in the vertical direction of the work step relative to the support bracket by the extension and contraction. Support device for work steps in Japanese paving machines.

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