JP2003104693A - Vehicle for high lift work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle for high lift work that can make a distance between a working floor and a vehicle body long without making the length of a boom long. SOLUTION: In this vehicle for high lift work, a post is derrickingly provided at the tip of a boom swingingly provided on a vehicle body, and a working floor is provided in a horizontally swingable manner at the tip part of the post. The working floor is mounted offset to the post so that one side face out of both right and left side faces of the working floor does not project outward from a plane including the vehicle body side end part of the post in the case of positioning the boom at a right angle to the axis of the vehicle body, positioning the post in the vertical state and positioning the working floor so that the longitudinal centerline of the working floor is parallel with the axis of the vehicle body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerial work vehicle in which a work floor is horizontally rotatable via a post at the tip of a boom provided on a vehicle body.

[0002]

2. Description of the Related Art The work floor of this aerial work vehicle is horizontally swingable at the tip of an extendable post that is provided at the tip of an extendable boom that is provided on the vehicle body so that it can be swung and raised and lowered. The post is attached to the bottom of the work floor, or the post is attached to a member that projects laterally from the work floor. It is provided on the center line in the front-rear direction.

Such an aerial work vehicle is installed on the backside of the bridge by combining a boom work, a hoisting motion, a telescopic motion, a post telescopic motion, and a horizontal rotary motion of the work floor from the aerial work vehicle installed on the bridge. It is used to locate the work floor and perform maintenance work on the underside of the bridge. In such a bridge backside inspection work, it is necessary to position the work floor outside the obstacle by swinging, hoisting, and extending the boom so as to straddle the obstacle on the side of the vehicle body. It is necessary to maintain a long distance from the side of the floor.

[Problems to be Solved by the Invention]

However, when the length of the boom is increased in order to increase the distance between the side of the vehicle body and the side surface of the work floor, the weight of the boom is increased and the strength and the strength of members supporting the boom are increased. The weight of the vehicle is significantly increased due to the necessity of increasing the rigidity, which leads to an increase in cost. In addition, the boom may not be able to be lengthened depending on the storage form of the boom and work floor and the length of the vehicle body.

The present invention has been made in view of these problems, and it is possible to increase the boom length without increasing the boom length.
It is an object of the present invention to provide an aerial work vehicle capable of increasing the distance between the work floor and the vehicle body.

[Means for Solving the Problems]

In order to achieve such an object, the aerial work vehicle according to the present invention is provided with a post at the tip of a boom rotatably provided on the vehicle body so that the boom can be raised and lowered horizontally. In an aerial work vehicle that has a work floor freely installed, the boom is positioned at a right angle to the axis of the vehicle body, the posts are positioned vertically, and the longitudinal centerline of the work floor is aligned with the axis of the vehicle body. When the work floor is positioned so that it is parallel to the work floor, one of the left and right side surfaces of the work floor does not project outward from the plane including the end of the post on the vehicle body side. Offset and installed.

Thus, of the left and right side surfaces of the work floor,
Since one side does not protrude outside the plane including the end of the post on the vehicle body side, it is possible to increase the distance between the work floor and the vehicle body without increasing the boom length. It is possible to position the work floor outside the obstacle by straddling the obstacle.

Further, in the aerial work vehicle in which a post is provided at the tip of a boom rotatably provided on the vehicle body so that it can be raised and lowered, and a work floor is provided at the tip of the post so that the work floor can be horizontally swung. Position the work floor at a right angle to the axis of the car body, and when the post is positioned vertically, place the work floor on the post so that the horizontal turning center of the work floor is located farther from the car body than the post. It may be offset and attached.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are rear views of an aerial work vehicle according to the present invention. This aerial work vehicle 1
Is configured based on a truck vehicle having front and rear wheels 2b and capable of traveling and having a driving cabin 2a at the front. Beams 31 are provided on the front, rear, left and right sides of the vehicle body 2 of the truck vehicle so as to be laterally extended with respect to the vehicle body 2 by built-in overhanging cylinders (not shown). Outriggers 3 each of which is composed of a jack 32 which is expandable and contractible downward by a jack cylinder (not shown) and a roller 33 which is attached to the lower end of the jack and is rotatable in the traveling direction of the vehicle body 2 are provided. These outriggers 3 are the body 2
An operator operates the outrigger operation device 34 provided at the rear portion to allow the beam 31 to project to the side of the vehicle body 2, the storage operation, and the extension and contraction operation of the jack 32. During work, the beam 32 is extended to the side of the vehicle body 2, and the jack 32 is extended to ground the roller 33 to the ground, thereby stably supporting the vehicle body 2 during work.

A swivel base 4 which is swung by a swivel motor (not shown) is provided on the vehicle body 2, and a boom 5 is pivotably supported on the swivel base 4 by a shaft 4a so that the boom 5 can swing. The boom hoisting cylinder 6 pivotally supported at both ends by the boom 5 hoists and hoists around the shaft 4a. This boom 5 is a base boom 5 pivotally supported by the swivel 4.
The telescopic cylinder (a) and the tip boom 5b are nested, and the telescopic cylinder (not shown) incorporated in the boom 5 extends and retracts the tip boom 5b with respect to the base boom 5a. In addition,
Although the boom 5 has a two-stage telescopic boom configuration here,
This may be a three-stage telescopic boom or a multi-stage telescopic boom configuration with more than three stages.

A support arm 7 is provided at the tip of the tip boom 5b.
A base end portion of is rotatably supported by a shaft 8. In addition, the link 9 formed in an inverted V shape is provided with the tip boom 5
The tip end of b is rotatably supported by a shaft 8 which supports the support arm 7 at its bent portion. Both ends of a post leveling cylinder 10 are pivotally supported by the upper end of the link 9 and the end of the tip boom 5b. The post-leveling cylinder 10 is connected by an oil passage (not shown) so as to expand and contract in association with the expansion and contraction operation of the boom hoisting cylinder 6, and keeps the support arm 7 in a constant posture regardless of the hoisting operation of the boom 5. Hold. In addition, the post hoisting cylinder 11 is attached to the lower end of the link 9 and the support arm 7.
Both ends are pivoted. The support arm 7 moves up and down with respect to the tip boom 5b about the shaft 8 by the expansion and contraction operation of the post hoisting cylinder 11.

A post 12 is attached to the tip of the support arm 7 so as to be a vertical body when the post hoisting cylinder 11 is contracted to its maximum size. The post 12 includes a holder 12e, which is attached to a side surface of a support arm and has a quadrangular cross section, which is formed in a hollow shape, a proximal post 12a having a quadrangular cross section, which is movably held in the holder 12e in the axial direction. A first section having a quadrangular cross section that is inserted into the end post 12a so as to be expandable and contractible.
An intermediate post 12b, and a second intermediate post 12c having a quadrangular cross section that is inserted into the first intermediate post 12b so as to extend and contract,
The distal end post 12d, which has a quadrangular cross section and is inserted into the second intermediate post 12c so as to be able to extend and contract, is telescopically configured to extend downward. The first intermediate post 12b, the second intermediate post 12c, and the tip post 1 with respect to the base end post 12a.
2d is expanded and contracted by a built-in expansion and contraction cylinder (not shown). Although the post 12 has a four-stage telescopic configuration except for the holder 12e, it may have a multi-stage telescopic configuration such as two-stage or three-stage telescopic configuration.

A moving cylinder 13 for moving the base end post 12a in the axial direction (vertical direction) with respect to the holder 12e is attached to the holder 12e and the base end post 12a as shown. In this moving cylinder 13, the cylinder tube 13a is attached to the holder 12e, and the rod 1
The tip of 3b is pivotally supported by the upper end of the base post 12a, and the rod 13b is expanded and contracted with respect to the cylinder tube 13a, so that the base post 12a is held by the holder 12e.
Can be moved up and down with respect to.

The bracket 14 is provided on the side of the tip of the tip post 12d, and the swivel mechanism 1 provided at the tip of the bracket 14.
A work floor leveling cylinder 16 is pivotally supported so as to be capable of swinging. The work floor leveling cylinder 16 expands and contracts in response to a signal from a tilt detection sensor (not shown) that detects the tilt of the work floor 17, which will be described later, to move the turning mechanism 15 up and down to keep the floor surface 17a of the work floor 17 horizontal.
A work floor 17 is provided below the turning mechanism 15 with a work floor bracket 1
It is attached so as to be horizontally rotatable via 8. This work floor 17 drives the swing mechanism 15 by an operation of a horizontal swing motor (not shown) to horizontally swing.

The work floor 17 includes a floor surface 17a and a floor surface 1a.
Handrail 17 constructed by standing upright from the edge of 7a
b. The work floor 17 is provided with an operating device 19 including an operation lever that is operated by an operator on the work floor to operate the swivel 4, the boom 5, the posts 12, and the work floor 17. . The vehicle body 2 is also provided with a similar operating device (not shown), and the operations other than the horizontal turning of the work table 17 can be similarly operated.

The attachment of the work floor 17 to the turning mechanism 15 will be described in detail with reference to FIG. The lower end of the work floor bracket 18 is attached to the upper surface of a mounting portion 17c that is provided at the rear end of the floor surface 17a of the work floor 17 at the center of the left and right sides, and the upper end of the work floor bracket 18 is attached to the lower part of the turning mechanism 15. Has been. As shown in FIG. 3, the horizontal turning center S of the work floor 17 is located on the front-rear center line L1 of the work floor 17 and is offset from the axis L3 of the post 12 by a distance P in the left-right direction. Thus, it is attached to the tip of the bracket 14 via the turning mechanism 15. Further, the left side surface 17e of the work floor 17 is positioned substantially in the same plane as the vertical surface G so as not to project outward (arrow T side) from the vertical surface G including the side surface 12f facing the boom 5 of the post 12. A work floor 17 is attached to the post 12 while being offset to the right. As shown in FIG. 1, the boom 5 is positioned at a right angle to the axis L2 of the vehicle body 2, the posts 12 are in a vertical state, and the center line L1 of the working floor 17 in the front-rear direction is the vehicle body 2.
The left side surface 17e of the work floor 17 when positioned so as to be parallel to the axis L2 of the
The work floor 17 is attached to the post 12 while being offset to the right side so as to be located substantially in the same plane as the vertical plane G including 2a.

The bridge inspection work by the aerial work vehicle 1 configured as described above will be described. The bridge inspection work performed by the aerial work vehicle 1 includes inspection and repair work on the outside surface of the bridge 40 and the underside 42 of the bridge 40 over the side fence 41 on the bridge 40 (or an elevated road). Etc.

When performing this work at high places, first, the beam 31 is extended to the side of the vehicle body 2 and then the jack 3 is used.
2 is extended downward and the roller 33 is grounded to support the vehicle body 2. Then, after raising the boom 5 to raise it,
While the swivel base 4 is swung and the boom 5 is extended, the post 12 is positioned in the vertical state, the work floor 17 is swung horizontally, and the post 12 and the tip of the post 12 are attached as shown in FIG. Work floor 17 fence 4
Move above 1. At this time, the moving cylinder 13 is fully extended so that the post 12 and the work floor 17 are located at the highest position with respect to the boom 5, and the post 12 and the work can be performed without increasing the elevation angle and extension amount of the boom 5. Floor 17
Can be moved outside over the fence 41. Subsequently, the work floor 17 is swung with respect to the post 12 and is positioned parallel to the fence 41 so that the work floor 17 does not come into contact with the fence 41.

In this way, the post 12 and the work table 17 are
Is moved over the fence 41 to the outside, the moving cylinder 13 is then contracted to move the base post 12a.
To the tip post 12d are moved to the most downwardly moved position with respect to the holder 12e. As a result, the work floor 17
Is moved down together with the base post 12a. Next, the work floor 17 is moved downward along the outer surface of the bridge 40 by extending the first intermediate post 12b, the second intermediate post 12c, and the tip post 12d with respect to the base post 12a. Thereby, the work floor 17 can be largely moved down with respect to the boom 5. By horizontally swinging the work floor 17 with the work floor 17 being moved to the outside surface side of the bridge 40 in this way, as shown in FIG. Inspection and repair work is performed on the outer side surface (the outer side surface of the fence 41) and the lower surface, as well as the underside 42 of the bridge.

In FIG. 1, the boom 5 is raised and extended, and with the post 12 fully retracted, the boom 5 is swung in a direction perpendicular to the axis L2 of the vehicle body 2 (to the side of the vehicle body 2) and work is performed. The floor 17 is the center line L1 in the front-rear direction of the work floor 17.
Is positioned so as to be parallel to the axis L2 of the vehicle body 2, and the left side surface 17e, which is closer to the post 12, of the left and right side surfaces of the work floor 17 is horizontally turned so as to face the vehicle body 2 side. There is. The shaded area R in FIG. 1 is an area where obstacles and the like can be avoided when the work vehicle 1 is operated at a high place, and the wider the shaded area R, the wider the working range.

Further, the work floor 57 shown by the chain double-dashed line in FIG. 1 shows the case where the horizontal turning center of the work floor 57 is on the axis L3 of the post 12. In the case of 1, the work area becomes wider by the offset (distance P) than in the conventional case, that is, the distance between the vehicle body 2 and the left side surface 17e of the work floor 17 becomes longer.

As described above, in the present invention, the work floor 1
As shown in FIG.
Since it is provided at a position offset leftward from the axis L3 of the post 12, the left side surface 1 of the work floor 17
By arranging the work floor 17 so that 7e faces the vehicle body 2 side, the distance between the vehicle body 2 and the work floor 17 can be made longer than in the conventional case. Therefore, the working range can be expanded without increasing the boom length, and
The work floor 17 can be positioned outside the obstacle by straddling an obstacle such as the fence 41 on the side of the vehicle body 2.

In the above embodiment, the horizontal turning center S of the working floor 17 is located on the center line L1 in the front-rear direction of the working floor 17, but the horizontal turning center S of the working floor 17 is set to the working floor 17.
The distance between the work floor 17 and the vehicle body 2 can be made longer by offsetting to the left side closer to the post 12 than the longitudinal centerline L1.

[0024]

As described above, according to the present invention,
Of the left and right sides of the work floor, the work floor is attached to the post in an offset manner so that one side does not project outward from the plane including the end of the post on the vehicle body side. It is possible to extend the work area without increasing the boom length, as compared with the case where the horizontal turning center is provided on the post axis. Also, by positioning the boom, post, and work floor so that the horizontal swing center of the work floor is farther than the car body across the post, the distance between the car body and the work floor can be increased, so the boom length can be reduced. It is possible to avoid obstacles without increasing the size.

[Brief description of drawings]

FIG. 1 is a rear view of an aerial work vehicle according to the present invention.

FIG. 2 is a rear view showing a working state of an aerial work vehicle according to the present invention.

FIG. 3 is a plan view of a work floor of the aerial work vehicle.

[Explanation of symbols]

1 aerial work vehicle 2 car body 5 boom 12 posts Side of 12f post 17 work floor 17e Left side of work floor G plane L1 Front-back centerline L2 axis (car body) L3 axis (post) S horizontal turning axis

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3F333 AA11 AC02 BA04 BA12 BB09                       BB26 BD02 BE02 BE08 CA15                       DA02 DB10

Claims (2)

[Claims] 1. A vehicle body, a boom rotatably provided on the vehicle body, a post rotatably provided at a tip end portion of the boom, and a work horizontally rotatably provided at a tip end portion of the post. In an aerial work vehicle having a floor, the boom is positioned at a right angle to the axis of the vehicle body, the posts are positioned vertically, and the longitudinal centerline of the working floor is the axis of the vehicle body. When the working floor is positioned so as to be parallel with the above-mentioned working floor, one of the left and right side surfaces of the working floor does not project outward from a plane including the end portion of the post on the vehicle body side. An aerial work vehicle, wherein a work floor is attached to the post in an offset manner. 2. A vehicle body, a boom rotatably provided on the vehicle body, a post rotatably provided at a tip end portion of the boom, and a work horizontally rotatably provided at a tip end portion of the post. In an aerial work vehicle having a floor, when the boom is positioned at a right angle to the axis of the vehicle body and the post is positioned in a vertical state, the horizontal swing center of the work floor is relative to the post. An aerial work vehicle, wherein the work floor is attached to the post in an offset manner so as to be located farther from the vehicle body.