JPH07252096A - Boom operating range regulator - Google Patents

Abstract

PURPOSE:To secure a boom operating range regulator of a high lift work vehicle capable of safely performing the detachable operations of a work unit being free of attachment or detachment to or from a boom tip part. CONSTITUTION:A booming state of a boom 13 constituted with a workbench at the tip part free of detachment is detected by a boom-state detecting means, while removal of this workbench 21 is also detected by a work unit detecting means. In addition, boom state at a time when this workbench 21 is removed is stored in memory by a boom-state storage means, and simultaneously, while the workbench 21 is being removed, such boom operation as turning to an operating radius beyond that of the boom 13 in the boom state when the workbench is removed is regulated by a boom-state regulating means. With this constitution, in the case where the workbench 21 is reattached to the boom tip part, the boom operation will not come to the operation radius exceeding that of the booms in a work unit removal booth state stored by the boom-state storage means, so that its overturning moment will in no cage grow larger at all.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boom working range control device for a high-altitude work vehicle in which a support device for mounting a column is provided at the tip of a boom.

[0002]

2. Description of the Related Art When performing distribution work on a telephone pole,
There is a case where a strut-mounting workbench device configured so that a workbench on which an operator rides can be mounted on a telephone pole is used. As shown in FIG. 1, this support device for mounting a column is detachably attached to the tip of the boom 13 of the aerial work vehicle 10. The boom 13 is erected on a swivel base 12 that is rotatably mounted on the vehicle body 11 so as to be extendable and retractable. Then, by performing ups and downs of the boom 13, the work table device 20 for mounting the column is moved to a desired utility pole D.
The work table mounting member 23 is moved to a higher place and is detachably attached to the electric pole D. After the support device 20 for attaching the support pillar is attached to the utility pole D, the work vehicle 10 at a high place is moved to a vacant land or the like so as not to obstruct the traffic in the vicinity of the utility pole D on which work is being performed. Utility pole D again after work
The aerial work vehicle 10 is moved to the vicinity of the position, and the boom 13 is raised and lowered and extended and retracted, so that the attachment / detachment hook 14 is again hooked on the attachment / detachment bar 22 to support the support column work table device 20.
Is removed from telephone pole D.

In the aerial work vehicle 10 as described above,
The boom 13 is pivotally supported by the swivel base 12 so as to be swingable, and the hoisting cylinder 15 is capable of performing hoisting operation by expanding and contracting. Therefore, the boom 13 has the undulating cylinder 1
A moment acts in the direction of compressing 5 (the direction in which the vehicle body 11 falls) (hereinafter, this moment is referred to as "falling moment"). This tipping moment not only acts in the direction of tipping the vehicle body 11, but also puts a heavy load on the boom 13 itself. Therefore, in such an aerial work vehicle 10, the overturning moment acting on the boom 13 is calculated by detecting the amount of extension and contraction of the telescopic boom 13, the undulation angle, and the load acting on the tip of the boom 13. The boom operating range restricting means prevents the falling moment from falling within a predetermined range, and the extension amount and the undulation of the boom 13 are supported by the boom operation range restricting means so as to prevent the load from being insufficiently strong. It is configured to regulate the corners.

Here, the weight of the workbench main body to which the workbench mounting member 22 of the strut mounting workbench apparatus 20 is attached is as heavy as about 140 kg. Therefore, when the column mounting workbench device 20 is attached to the tip of the boom 13, the movable range of the tip of the boom 13 that can stably support the vehicle body 11 against the falling moment (workbench). The boom operation allowable range during mounting) is the range indicated by B in FIG. In addition, the workbench device 2 for mounting the column
When 0 is removed, the movable range of the tip of the boom 13 (boom operation allowable range when the workbench is removed) is the range indicated by A and B.

For example, as shown by the solid line in FIG.
The aerial work vehicle 10 is parked at a position where the distance from the power pole D to the pivotal support portion of the boom 13 is L1 and the work platform device 20 for mounting the column is installed.
In the case of performing the mounting work of No. 2, the boom 13 is located in the boom operation allowable range B at the time of mounting the workbench. When the workbench device 20 for mounting the column is removed, in order to prevent the overturning moment from increasing, the aerial work vehicle 10 is parked at the same position as when it is installed, so that the boom 13 is the same as when it is installed. It was moved to the position and removed.

[0006]

However, when the pole mounting workbench device 20 is removed, when the aerial work vehicle 10 is parked at a position away from the electric pole D to L2 as shown by the alternate long and short dash line, As-is work table device 2 for mounting columns
When the removal work of 0 is attempted, the boom 13 is tilted and extended so that the working radius of the boom 13 becomes larger than that when the supporting pole workbench device 20 is attached. At this time, even if the boom operation exceeds the boom operation allowable range B when the workbench is mounted, the overturning moment is small and the boom operation allowable range A when the workbench is removed is small.
The boom operation is not restricted because it is within the range.
Therefore, the attachment / detachment bar 22 is hooked on the attachment / detachment hook 14 to attach the attachment / detachment bar 22 to the tip end portion of the boom 13 for supporting the column.
After the support pole mounting workbench device 20 is detached from the utility pole D after mounting, the overturning moment acting on the vehicle body 11 becomes large, the vehicle body becomes unstable, and a large force acts on the telescopic boom 13. was there.

The present invention has been made in view of the above problems, and provides a boom operating range restricting device for an aerial work vehicle capable of safely attaching and detaching a work device detachably attached to the boom tip. It is intended to be provided.

[0008]

In order to achieve the above-mentioned object, the boom operating range restricting device of the present invention comprises:
A work device is detachably attached to the tip of a boom that is configured to be capable of undulating and extending and contracting with respect to the vehicle body. The boom state of the boom is detected by the boom state detecting means, and the removal of the work device from the boom is detected by the work device detecting means. The boom state storage means stores the state of the work equipment removal boom when the work equipment removal detection signal is transmitted from the work equipment detection means, and the boom operation restriction means stores the boom during the transmission of the work equipment removal detection signal. It is configured to restrict the boom operation, which is a working radius exceeding the working radius of the boom in the boom for removing the working device stored by the state storage means.

According to such a boom operating range restricting device, when the working device attached to the boom tip portion is once removed and then attached to the boom tip portion again, the work device removal boom state stored by the boom state storage means is set. It is not possible to extend or collapse the boom so that the working radius exceeds the working radius of the boom. Therefore, even if the moment acting on the boom when the working device is attached to the tip of the boom again becomes larger than the moment acting on the boom before the working device is removed, the boom is arranged. The vehicle body will not become unstable, and the moment that a large force acts on the boom itself will not occur.

Further, the working device is a strut mounting workbench configured to be attachable to and detachable from a strut such as a telephone pole, and the boom state storage means stores a boom state when the strut mounting workbench is removed. Is configured to
After attaching the pole mounting workbench attached to the tip of the boom to the pole, remove the pole mounting workbench from the tip of the boom, move the car body once, then remove the pole mounting workbench from the pole again, and then boom tip If the vehicle is stopped at a position different from the vehicle stop position when the support column is attached, the work radius does not become larger than the boom work radius when the support column is attached. Therefore, when the work table for mounting the support columns is attached, the vehicle body does not become unstable and a large force does not act on the boom itself.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. First, referring to FIG.
An aerial work vehicle equipped with the boom operation range restricting device according to the present invention will be described. The work vehicle 10 for aerial work is provided with a swivel base 12 which is rotatable on a vehicle body 11 which can travel freely, and a boom 13 is pivotally supported on the swivel base 12 so as to be capable of undulating.
The boom 13 is telescopically formed (nested) by a plurality of boom members, and can be freely extended and retracted by the telescopic cylinder 16 as described above, and can be freely hoisted and retracted by the undulating cylinder 15. Is configured.

In this work support device 20 for mounting a support, a base end is detachably fixed to a utility pole (support) D, and a work mount mounting member 23 whose tip extends to the side of the utility pole D, and this work. It is composed of a workbench 21 for mounting an operator on the tip of a base mounting member 23. An attachment / detachment bar 22 is attached to the workbench 21 on the side opposite to the attachment position of the workbench attachment member 23. The attachment / detachment hook 14 attached to the tip of the boom 13 is attached to the attachment / detachment bar 2.
By mounting on the work support device 20
Can be attached to the tip of the boom 13.

The column mounting workbench device 20 is moved to the upper part of the electric pole D by the operation of the boom 13. Then, after fixing the base end portion of the workbench mounting member 23 to the upper portion of the electric pole D, the boom 13 is operated to disengage the attachment / detachment hooks 14 from the attachment / detachment bar 22, so that the support attachment workbench device 20 is obtained. It can be left on the utility pole D side. In addition, the boom 13 is operated again to hook the attachment / detachment hook 14 on the attachment / detachment bar 22, and then the base end portion of the workbench attachment member 23 is attached to the utility pole D.
From the power pole D
Can be removed from.

In the aerial work vehicle 10 constructed as described above, a tipping moment acts on the vehicle body 11 via the telescopic cylinder 15, and the tipping moment causes the boom 13 to extend and contract, perform a hoisting action and the boom 13. It changes depending on the load on the tip of the. That is, the larger the amount of extension of the boom 13 and the smaller the undulation angle, the larger the falling moment, and the larger the load on the tip of the boom 13, the larger the falling moment. If the overturning moment becomes too large, the vehicle body 11 becomes unstable, and the deflection of the boom 13 itself also becomes large, which is not preferable in terms of work safety and safety of the aerial work vehicle 10 itself. In the work vehicle 10, the boom 13
When the overturning moment exceeds a predetermined moment, a boom operation range restricting device is provided for restricting the boom operation in the direction in which the moment becomes larger (the direction in which the working radius becomes larger).

As shown in FIG. 3, this boom operating range restricting device comprises an operating device 31, a hoisting angle sensor 32, an extension / contraction amount sensor 33, a load sensor 34, a signal transmitting portion of a work bench sensor 35, and a controller 40. Then, the operation control of the undulating cylinder 15 and the telescopic cylinder 16 is performed by the operation signal from the controller 40.

The operation device 31 is arranged on the vehicle body 11 and transmits an operation signal for controlling the operation of the boom 13 such as ups and downs and expansion and contraction. The undulation angle sensor 32 is the undulation cylinder 1
5, the up-and-down angle of the boom 13 due to the extension / contraction operation of the boom 13 is detected, and the extension / contraction amount sensor 33 detects the extension / contraction amount of the boom 13 due to the extension / contraction operation of the extension / contraction cylinder 16. In addition, the load sensor 34
Is for detecting the load applied to the tip end portion of the boom 13, and the workbench sensor (working device detection means) 35 is attached to the tip end portion of the boom 13 for the workbench device 20 for mounting the column or is removed. To detect
Then, these detection signals are transmitted to the controller 40. In addition, the up-and-down angle sensor 32 and the expansion / contraction amount sensor 33 constitute the boom state detecting means described in the claims.

The controller 40 controls an operation signal from the operation device 31, and sends an operation signal to the undulating cylinder 15 and the telescopic cylinder 16. The controller 40 is provided with a boom operation restriction unit 41 and a boom state storage unit 42. The boom operation restricting means 41 irrespective of the operation signal from the operation device 31 causes the boom 13 to operate.
The operation of the boom 13 that exceeds the range of B in FIG. 2 is restricted in a state in which the strut mounting workbench device 20 is attached to the tip end of the. Boom state storage means 42
Is a workbench device 2 for mounting a column by a workbench sensor 35.
The detection values of the up-and-down angle sensor 32 and the expansion / contraction amount sensor 33 when 0 is detected to be removed are stored.

In the case of carrying out the work of removing the pole mounting workbench device 20 from the power pole D using the work vehicle 10 for height mounting provided with the boom operation range restricting device constructed as described above, first, the power pole D The aerial work vehicle 10 is stopped in the vicinity of. At this time, when the distance from the electric pole D to the aerial work vehicle 10 is equal to or shorter than L1, the raising and extending operations of the boom 13 can be performed without being restricted. The tip portion of the boom 13 can be moved to the strut mounting workbench device 20 attached to the.

When the distance from the utility pole D to the work vehicle 10 at a height is L1 or more, the boom 13 is raised and extended toward the support pole mounting work table device 20 on the utility pole D. Then, the operation of the boom 13 is stopped by the extension amount and the hoisting angle of the boom 13 stored in the boom state storage means 42. In this case, the operator again moves the work vehicle 10 at a height, stops the work vehicle 10 at a position where the distance from the telephone pole D is L1, and sets the extension amount of the boom 13 and the undulation angle to the work for mounting the column. The extension amount and the undulation angle are the same as when the base device 20 is attached. As a result, even when the support table 20 for mounting the column is attached to the tip of the boom 13, the vehicle body 1
1 does not become unstable and the boom 13 is not heavily loaded.

In the above embodiment, the detection values of the up-and-down angle sensor 32 and the extension / contraction amount sensor 33 when the work bench sensor 35 detects that the support pole work bench device 20 is removed are in the boom state. The storage means 42 stores the data, but the present invention is not limited to this. That is, the boom state stored in the boom state storage means 42 may be the work table-attached boom operation allowable range indicated by B in FIG. As a result, even if the distance from the utility pole D to the work vehicle 10 is L1 or more, if the boom operating permissible range B when the work bench is mounted is within the boom operation allowable range B, the extension amount and the undulation angle of the boom 13 are set to the work pole device for mounting the prop. Although it is possible to make the extension amount and the tilt angle larger than those when the boom 20 is attached, the vehicle body 11 may become unstable or the boom 1 may become unstable even when the support work table 20 is attached to the tip of the boom 13.
No heavy load on 3. Further, when the operation of the boom 13 is stopped by the extension amount and the hoisting angle of the boom 13 stored in the boom state storage means 42, a warning device such as a buzzer is sounded to alert the operator. But of course

[0021]

As described above, according to the boom operating range restricting device of the present invention, the boom state detecting means detects the boom state of the boom having the working device detachably attached to the tip end thereof, and the working device is detected. Detecting removal of the work implement from the boom by means. The boom state storage means stores the boom state when the work device is removed, and while the work device is removed, the work radius of the boom in the boom state when the work device is removed is exceeded. Boom operation, which is the working radius, is restricted by boom operation restriction means. Therefore, when the work device attached to the boom tip is once removed and then attached to the boom tip again, the work device removal stored in the boom state storage means does not exceed the work radius of the boom in the boom state. , Even if the moment that acts on the boom when the work device is attached to the tip of the boom again becomes larger than the moment that acts on the boom before the work device is removed, the boom is installed. Also, the car body will not become unstable, and the boom itself will not have a moment to exert a large force.

In addition, the working device is a support pole mounting work bench device configured to be attachable to and detachable from a support pole such as a utility pole,
When the boom state storage means is configured to store the boom state when the pole mounting workbench is removed, when the pole mounting workbench device attached to the utility pole is removed, the vehicle stop position Even when the position is different from the stop position of the vehicle body when the support column is attached, the work radius does not become larger than the boom work radius when the support column is attached.
For this reason, when re-installing the strut mounting workbench,
There is no instability of the car body or large force on the boom itself.

[Brief description of drawings]

FIG. 1 is a side view of an aerial work vehicle provided with a boom operation restriction device according to the present invention.

FIG. 2 is a side view showing a boom operation regulation range of the above-mentioned work platform.

FIG. 3 is a block diagram of the boom operation restriction device.

[Explanation of symbols]

 10 High-altitude work vehicle 11 Vehicle body 12 Revolving base 13 Boom 14 Attachment / removal hook 15 Elevating cylinder 16 Telescopic cylinder 20 Strut mounting workbench device 21 Workbench 22 Detachment bar 23 Workbench mounting member D Utility pole

Claims (2)

[Claims] 1. A vehicle body, a boom that is configured to move up and down and extend and retract with respect to the vehicle body, a work device that is detachably attached to a tip portion of the boom, and a boom state of the boom is detected. Boom state detection means, work device detection means for detecting removal of the work device from the boom, and boom state for storing work device detached boom state when a work device detachment detection signal is transmitted from the work device detection means Storage means and a boom operation restriction that restricts the boom operation that is a working radius that exceeds the working radius of the boom in the work device removal boom state stored by the boom state storage means during transmission of the work device removal detection signal. A boom operating range restricting device comprising: 2. The work device is a support column mounting worktable that is detachable from a support column, and the boom state storage means stores a boom state when the support column mounting worktable is removed. The boom operation range limiting device according to claim 1, which is characterized in that.