JP2567987Y2 - Arm turning restriction device for aerial work vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] The present invention is based on the
The present invention relates to an aerial work vehicle to which a work table is attached via a rotatable arm, and more particularly to an arm rotation restricting device for an aerial work vehicle provided with means for restricting the arm from turning.

[0002]

2. Description of the Related Art A work platform for aerial work is provided with a swivel base that can be swiveled on a vehicle body, and a base end of a boom that can freely move up and down, and the like is swingably connected to the swivel base. . An arm that can move up and down and turns freely is attached to the tip of the boom, and a worktable is attached to the tip of the arm to improve workability. In such an aerial work vehicle, a work table attached to the tip of the arm may interfere with the boom when the arm is turned, depending on the elevation angle between the boom and the arm. For example, when the boom angle is the smallest and the arm angle is also the smallest, the turning angle before the arm interferes with the boom is the smallest. The greater the angle of the boom and arm up and down, the less the worktable interferes with the boom, so the angle at which the arm can pivot increases, and the worktable does not interfere with the boom when the boom and the arm up and down are at the maximum angle. It is possible to turn at an appropriate angle.

In such an aerial work vehicle, a stopper is provided to restrict the arm from turning in order to avoid interference between the work table and the boom when the arm is turned. In this case, although the turning angle of the arm varies depending on the boom and the up-and-down angle of the arm, a stopper is provided to adjust the turning of the arm uniformly when the turning angle of the arm is minimum.

[0004]

However, the above-mentioned minimum turning angle is when the boom and the arm are up and down at a minimum, which means that the workbench is located near the ground and the normal work is performed. Do not undulate. When the workbench is in the normal working position, the boom and the arm have a large up-and-down angle, so that the swing angle of the arm until the workbench interferes with the boom is larger than the swing angle regulated by the stopper. Therefore, even when there is a margin in the turning angle of the arm as described above, the turning is restricted by the stopper, so that there is a problem that the working range is narrowed.

The present invention has been made in view of such a problem, and provides an arm turning restricting device for an aerial work vehicle capable of restricting the turning angle of the arm in accordance with the boom and the up-and-down angle of the arm. It is intended to be.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, in the arm turning restricting device for an aerial work vehicle according to the present invention, an up-and-down moving boom is provided on a vehicle body. An arm is provided so as to freely rotate, and a work table is attached to a tip of the arm. The controller sends a signal to the arm turning mechanism based on a signal detected by at least one of the boom angle detection sensor for detecting the boom up / down angle and the arm angle detection sensor for detecting the arm up / down angle. To restrict the turning operation of the arm.

[0007]

With such an arm turning restricting device, the angle at which the arm is turned can be made small when the boom and the up-and-down angle of the arm are small, and the turning angle of the arm can be made large when the up-and-down angle is large. . Therefore, it is possible to increase the turning angle of the arm when the work table is moved to the normal working position, that is, when the boom and the arm have a large up-and-down angle.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, an aerial work vehicle equipped with the arm rotation restricting device according to the present invention will be described with reference to FIG. In the aerial work vehicle 1, the vehicle body 2
A swivel table 4 that can swivel with respect to is provided.
A base end of the boom 3 is pivotally mounted on the upper part of the boom 3. The boom 3 is composed of a two-stage boom member and is nested,
The telescopic cylinder 8 can be freely expanded and contracted by the telescopic operation. The boom 3 can be freely raised and lowered by the expansion and contraction operation of a boom raising and lowering cylinder 7 provided between the swivel 4 and the boom 3.

At the end of the boom 3, there is provided a vertical post 9 which is always held vertically by a leveling mechanism (not shown). An arm attachment member 11 is pivotally attached to the vertical post 9 so as to be freely rotatable, and the arm 6 is pivotally attached to the arm attachment member 11 so as to be able to move up and down. At the tip of the arm 6, a worktable 5 that is always horizontally held by a worktable leveling cylinder 13 regardless of the up-and-down angle of the arm 6 is attached. The turning operation of the arm mounting member 11 is performed by the movement of the arm turning mechanism 10 provided in the arm mounting member 11 at the pivotal connection between the arm mounting member 11 and the vertical post 9. The undulation of the arm 6
This is performed by the expansion and contraction operation of the arm up-and-down cylinder 12 provided between the vertical post 9 and the arm 6.

In the aerial work vehicle constructed as described above, the work table 5 is moved to a predetermined position by raising and extending the boom 3 and raising and lowering and turning the arm 6 to perform work. The turning of the arm can be performed up to an angle at which the work table 5 provided at the tip of the arm 6 does not interfere with the boom 3, but this angle differs depending on the angle of the arm 6 and the boom 3. Therefore, the arm turning restricting device 20 as shown in FIG. 2 restricts the arm turning angle (hereinafter referred to as arm turning angle) so that the arm 6 does not interfere with the boom 3. Arm turning restriction device 20
Is composed of a boom angle detection sensor 21, an arm angle detection sensor 22, and a controller 23 for detecting the boom undulation angle. Then, the controller 23 calculates the pivotable angle of the arm 6 based on signals from the boom angle detection sensor 21 and the arm angle detection sensor 22 and sends a signal to the arm rotation mechanism 10 to regulate the rotation angle of the arm 6.

Here, the pivotable angle θ of the arm due to the difference in the up-and-down angle of the arm and the boom will be described with reference to FIGS. 3 and 4. FIG. 3 and FIG. 4 are a top view and a rear view of the aerial platform vehicle when the boom 3 has the minimum undulation angle. FIG. 4 is a rear view of the aerial work vehicle, in which A, B, and C indicate cases where the undulating angle of the arm 6 is maximum, middle, and minimum, respectively. 3A shows the case where the angle of the arm is the largest, FIG. 3B shows the case where the angle of the arm is the middle, and FIG. 3C shows the case where the angle of the arm is the smallest. FIG. 3 is a top view of a boom provided in the aerial work vehicle, showing the swivelable angle of the vehicle by a two-dot chain line.

As shown in FIG. 3 (C), when the undulation angle of the arm 6 is minimum, the pivotable angle θ of the arm 6 is about 9
When the arm 6 is turned any further, the work table 5
And boom 3 will interfere. As shown in FIG. 3B, when the angle of the arm 6 is intermediate, the position where the work table 5 and the boom 3 interfere with each other is closer to the base end of the boom 3 than in the above state. The possible angle θ is about 100 °. Further, as shown in FIG. 3 (A), when the angle of undulation of the arm 6 is the maximum, the position where the work table 5 and the boom 3 interfere with each other is further on the base end side of the boom 3, so that the pivotable angle θ is It is about 120 °.

As shown in FIG. 5, FIG. 6, FIG. 7, and FIG. 8, as the up-and-down angle of the boom 3 or the up-and-down angle of the arm 6 increases, the position at which the work table 5 and the boom 3 interfere with each other increases. Since it is on the end side, the turnable angle θ is large. Also, as shown in FIG. 7, when the boom undulation angle is maximized, the worktable 5 and the boom 3 do not interfere with each other when the arm undulation angle is an intermediate undulation angle, so that the pivotable angle θ is obtained.
Is 180 °. Therefore, if the arm is turned in accordance with the boom up / down angle and the arm up / down angle, the maximum arm swivel angle θ at which the work table and the boom do not interfere with each other can be obtained.

Table 1 below shows an example of the arm pivotable angle θ depending on the difference between the boom and arm up / down angles.

[0015]

[Table 1]

In the above embodiment, the controller is operated based on the boom undulation angle and the arm undulation angle to determine the arm pivotable angle. However, the arm pivot angle regulating device according to the present invention is used. However, the present invention is not limited to this, and the pivotable angle may be obtained based on the angle of either the boom or the arm. Further, in the above embodiment, only the leveling mechanism that can always keep the work table horizontal at the tip of the arm is provided.However, the work table can be rotated while always maintaining the work table at the tip of the arm. It may be a mechanism that can perform the above.

[0017]

As described above, in the arm turning restricting device of the aerial work vehicle according to the present invention, the signal detected by at least one of the boom angle detecting sensor and the arm angle detecting sensor. And the controller controls the angle at which the arm is turned based on the arm rotation, and the arm is turned by the arm turning mechanism. For this reason, when the boom and the arm up and down angle, in which the work table and the boom are most likely to interfere with each other when the arm is turned, are at a minimum, the swingable angle of the arm is reduced, and the boom and the arm up and down angle are increased. When the work table and the boom do not interfere with each other, the swivelable angle can be increased. Therefore, the turning angle of the arm in a state where the normal work is performed can be made large, so that the work can be performed in a wide range.

[Brief description of the drawings]

FIG. 1 is a perspective view of an aerial work vehicle equipped with an arm rotation restricting device according to the present invention.

FIG. 2 is a block diagram of the arm rotation restricting device according to the present invention.

FIG. 3 is a top view of the aerial work vehicle when the boom angle is at a minimum.

FIG. 4 is a rear view of the aerial work vehicle when the boom angle is a minimum.

FIG. 5 is a top view of the aerial work vehicle when the boom angle is intermediate.

FIG. 6 is a rear view of the aerial work vehicle when the boom angle is intermediate.

FIG. 7 is a top view of the aerial work vehicle when the boom angle is the maximum.

FIG. 8 is a rear view of the aerial platform vehicle when the boom angle is the maximum.

[Explanation of symbols]

 Reference Signs List 1 aerial work platform 3 boom 5 work table 6 arm 9 vertical post 10 arm turning mechanism 11 arm mounting member 20 arm turning restricting device 21 boom angle detection sensor 22 arm angle detection sensor 23 controller

Claims (1)

(57) [Scope of request for utility model registration] A boom disposed on a vehicle body so as to be able to undulate freely; an arm provided at the tip of the boom so as to be able to undulate and rotate; a work table attached to the tip of the arm; An arm turning mechanism that performs a turning operation of an arm; an angle detection sensor that detects at least one of an up / down angle of the boom and an up / down angle of the arm; and the arm turning mechanism based on a signal detected by the angle detection sensor. And a controller that sends a signal to the arm to restrict the turning operation of the arm.