JPH0344787Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a work range regulating device for an aerial work vehicle.

For aerial work vehicles equipped with a work platform at the tip of the boom, in order to prevent the vehicle from tipping over during high-altitude work, the work radius of the boom is regulated according to the extended state of the outriggers, etc. Regulating devices are conventionally known, for example as described in Japanese Utility Model Application Publication No. 58-30700.

In order to make full use of the performance of the aerial work vehicle, this working range regulating device has a working range that is set approximately equal to the overturning limit of the aerial work vehicle. Depending on the location of the boom, the boom may have to be rotated and retracted many times to move the platform to the desired position.
There are problems in that workability deteriorates, the calculation and control become complicated, and the device itself becomes large.

To solve this problem, the work platform can be moved to the desired position without having to repeatedly rotate and retract the boom, making it easier to move the work platform to the desired position.
In order to simplify the calculation and control, the work range is set on the largest circumference located within the tipping limit range with the boom rotation center as a reference,
Based on the boom rotation center, the boom rotation range is divided into front, rear, left and right sides at fixed angles, and for each divided area, the distance from the boom rotation center to the nearest tipping limit range is determined as the working radius. Some machines are set in a circumferential fan shape, but these work ranges have a large sacrifice work range compared to the tipping limit range, and there is a problem that the work platform cannot be moved to the desired position. be.

The present invention was developed in view of the above circumstances, and the work range in front or rear of the aerial work vehicle is larger than the work radius of the left and right side work ranges, and the left and right ends are at the limit of work. Either a sector-shaped first working range has a turning angle that substantially touches the range, or a sector-shaped second working range has a working radius larger than the first working range and has a turning angle such that the left and right ends substantially touch the limit working range. Work range regulation for aerial work vehicles that allows for superior work efficiency and reduces the work range sacrificed to the overturning limit of aerial work vehicles by selectively changing the work range according to the work. The purpose is to provide a device.

Embodiments of the present invention will be described below with reference to the drawings. As shown in Fig. 1, the aerial work vehicle has a telescoping boom 3 pivotally supported on a turntable 2 provided on a vehicle body 1, and a work platform 4 held in equilibrium at the tip of the telescoping boom 3. The boom 3 is expanded and contracted by a built-in expansion and contraction device, and raised and lowered by a lifting cylinder 5. The turntable 2 is equipped with a boom rotation position detector 6 and a luffing angle detector 7, and the telescoping boom 3 is equipped with a boom extension/contraction length detector 8.

As shown in FIG. 2, in the work range regulating device, the boom extension/contraction length detector 8 and the up-and-down angle detector 7 are connected to a work radius calculator 9, and the swing position detector 6 is connected to the work radius calculator 9 via a changeover switch 10. , within the nearly elliptical limit work range L in which the work vehicle 15 can work stably without falling over, and the first one in which the turning angle is prioritized over the work radius.
First working range setting device 1 for setting the working range of
1, or connected to a second working range setting device 12 that sets a second working range in which the working radius is given priority over the turning angle, and each of the working range setting devices 11, 12
The rotation position detector 6 is detected from each set work range.
Outputs the set working radius according to the boom rotation position sent from. As shown in FIG. 3, the first working range setting device 11 is installed at the front and rear of the working vehicle 15 with a working radius b larger than the working radius a of the fan-shaped working range on the left and right sides circumscribing the limit working range L. , and a fan-shaped first working range M having a turning angle α such that the left and right ends contact the limit working range, whereas the second working range setting device sets the working range M as shown in FIG. When moving the car 15 forward and backward, the working radius c is larger than the working radius b set by the first working range setting device 11, and the left and right ends are set by the first working range setting device 11.
A fan-shaped second working range N having a turning angle β that is smaller than the turning angle α set in and in contact with the limit working range L is set. The working radius calculator 9, the first working range setting device 11, and the second working range setting device 12 are connected to a comparator 13, and the comparator 1
3 is connected to the operation regulating device 14, and the comparator 13 compares the working radius calculated by the working radius calculator 8 and the setting work sent from the first working range setting device 11 or the second working range setting device 12. Compare the radii, and when the working radius reaches the set working radius, comparator 1
3 is for outputting and stopping the operation of the boom by the operation regulating device 14.

With the above configuration, the boom length signal detected by the telescopic length detector 8 and the boom hoisting angle signal detected by the hoisting angle detector 7 are sent to the working radius calculator 9, and are calculated by the working radius calculator 9. The boom working radius signal thus obtained is sent to the comparator 13. If a large working radius is not required, by switching the changeover switch 10 to the first working range setting device 11 side, the first working range setting device 11 corresponds to the turning position detected by the turning position detector 6. Then, a set working radius signal corresponding to the swing position of the boom is output from the first working range shown in FIG. When this point is reached, the comparator 13 outputs an output and activates the operation regulating device 14 to stop the boom from moving outside the set working range. When a large working radius is required, by switching the changeover switch 10 to the second working range setting device 12 side, the second working range setting device 12 corresponds to the turning position detected by the turning position detector 6. Then, a set working radius signal corresponding to the swing position of the boom from the second working range shown in FIG. 4 is outputted to the comparator 13, and the working radius signal output from the working radius calculator 9 becomes the set working radius signal. When this is reached, the comparator 13 outputs an output and activates the operation regulating device 14. That is, by switching the changeover switch 10 to the first work range setting device 11 side, a wide angle range is set in the front and rear of the work vehicle, so that work can be performed without restrictions on turning. By switching the changeover switch 10 to the second work range setting device 12 side, work can be performed in the front and rear of the work vehicle with a small turning angle but a large work radius.

As described above, according to the present invention, the turning angle and working radius of the regulated work range can be changed depending on the work, so the present invention is effective in improving the workability and safety of aerial work vehicles. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of the aerial work vehicle, FIG. 2 is a block diagram of the working range regulating device, and FIGS. 3 and 4 are working range diagrams. 6... Turning position detector, 7... Luffing angle detector, 8... Extension/contraction length detector, 9... Working radius calculator, 10... Changeover switch, 11... First working range setting device, 12...Second working range setter, 1
3... Comparator, 14... Operation regulating device.

Claims (1)

[Scope of utility model registration request] The working range regulating device of the aerial work vehicle, which detects the swing angle of the boom and the working radius of the boom and regulates the operation of the boom when the boom reaches a predetermined position, ensures that the aerial work vehicle is stable without falling over. Within the limit work range that can be worked with, the work range in front or rear of the aerial work vehicle must have a work radius larger than the work radius of the left and right side work ranges, and the left and right ends approximately correspond to the limit work range. A fan-shaped first working range having a turning angle that touches the first working range, and a sector-shaped second working range having a working radius larger than the first working range and a turning angle such that the left and right ends substantially touch the limit working range. , a work range regulating device for an aerial work vehicle, characterized in that it can be selectively switched depending on the work.