JP2000281296A - Safety device for high lift work car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a boom or a working table from interfering with an operator operating a lower operating device. SOLUTION: A high lift work car is provided with an upper operating device 10 installed on a working table, and a lower operating device 20 installed on a car body, and actuators 51, 52, 53 are operated in response to the operation of either one of these operating devices to control the operations such as turning derricking, telescoping and of a boom of the high lift work car. When it is detected that an operator operates the lower operating device 20, a warning is given by an alarm against the operation of the boom and the working table of intruding into the ambient area of the lower operating device 20 (the area surrounding the operator operating the lower operating device 20), or the operation of the actuators is regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a boom operably mounted on a vehicle body for turning, raising and lowering, expanding and contracting, etc., and a worktable attached to the tip of the boom so as to swing freely. Related to high altitude work vehicles.

[0002]

2. Description of the Related Art Such an aerial work vehicle moves a workbench on which an operator is boarded to a predetermined height, and works at a height, for example,
It has been widely used to perform wiring work for utility poles and the like. Boom operation (turning, undulating,
The operation of the workbench (horizontal rotation with respect to the boom tip, that is, swinging operation) is performed by the operator operating the operation lever. An operating device having such an operating lever is provided on a work table, a rear part of a vehicle body, and the like,
They are referred to as an upper operating device and a lower operating device, respectively.
The operator operates the upper operation device while riding on the work table, or controls the operation of the boom and the work table by operating the lower operation device on the ground.

[0003]

In such an aerial work vehicle, the boom operates on the vehicle body provided with the lower operation device, and the boom or the work table moves to the vicinity of the lower operation device. It is possible. Therefore, when the operator operates the operation lever of the lower operation device to control the operation of the boom and the work table, the boom or the work table may interfere with the operator operating the lower operation device. There is a problem.

The present invention has been made in view of such a problem, and is intended to prevent a worker operating a lower operating device from being interfered by a boom or a workbench. It is intended to provide a vehicle safety device.

[0005]

In order to achieve the above object, according to the present invention, there is provided an upper operating means disposed on a workbench for operating the boom and an upper operating means disposed on the vehicle body for operating the boom. The aerial work vehicle is configured to include a lower operating means for performing an operation, and to operate an operating means in accordance with an operation of the upper operating means or the lower operating means to control operations such as turning, raising and lowering, expanding and contracting the boom. ing. The aerial work vehicle further includes lower operation detecting means for detecting the presence or absence of operation of the lower operating means. When the lower operation detecting means detects that the lower operating means is being operated, the lower operating means detects the operation of the lower operating means. An alarm operation is performed by an alarm means for an operation of the boom such that the boom and the workbench enter the surrounding area.

[0006] Boom operating position detecting means for detecting the turning angle, the undulating angle and the amount of expansion and contraction of the boom are provided, and the alarm means is provided for detecting the position of the boom and the work table detected by the boom operating position detecting means. It is preferable that an alarm operation is performed for an operation of the boom that moves inward. Further, it is preferable that the surrounding area is set as an area surrounding an operator when operating the lower operation means.

According to the safety device for an aerial work vehicle of the present invention having such a configuration, when the operator operates the lower operating means to operate the boom, the boom or the work table is moved to the position of the operator. When the vehicle approaches the surrounding area and enters the surrounding area, an alarm is activated by the alarm means, so that the boom or the work table can be prevented from interfering with the worker. The alarm operation in this specification includes not only an alarm by an alarm lamp and an alarm buzzer, but also an operation of restricting the operation of the boom and issuing an alarm.

When the boom is operated by the operation of the upper operating means, there is no operator operating the lower operating means, so that the operation of the boom such that the boom and the work table enter the area around the lower operating means. Is allowed as is.

Another object of the present invention is to provide an aerial work vehicle in which a boom is turned, raised and lowered, and extended and contracted in response to an operation of an upper operating means or a lower operating means, and the presence or absence of an operator at an operating position of the lower operating means. A lower operating operator detecting means for detecting the presence of an operator at the operating position of the lower operating means when the lower operating operator detecting means detects that an operator is present at the operating position of the lower operating means. An alarm is activated for the operation of the boom that causes intrusion.

[0010] According to the safety device having such a configuration, a warning operation by the warning means can be always performed while the operator is located in front of the lower operation means to operate the lower operation means. Therefore, an alarm operation is performed for a boom operation in which the boom and the workbench enter the area around the lower operation means by operation of the lower operation means, and interference with the operator is prevented beforehand.

The size of the worker at the operating position of the lower operating means is detected by the lower operating worker detecting means, and the surrounding area is variably set according to the detected size of the worker. Is preferred. Thereby, an optimal surrounding area is set according to the size of the worker.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. An aerial vehicle equipped with a safety device according to the present invention is shown in FIGS.
The aerial work vehicle 1 is provided with a swivel base 3 which can be swiveled by a swivel motor (not shown) on a carrier frame of a truck-based body 2. A boom 4 is pivotally connected to the tip of a column constituting the revolving base 3 so as to be able to move up and down. The boom 4 is moved up and down by an up and down cylinder 5. The boom 4 is nested from a base end boom, an intermediate boom and a distal end boom, and is telescopically operated by a built-in telescopic cylinder (not shown).

A vertical post 6 is pivotally connected to the tip of the tip boom so as to be able to swing up and down. Workbench 7 on vertical post 6
The work table 7 is swingable about a vertical axis of the vertical post 6 in a horizontal plane. Outrigger jacks 8 are provided at four front, rear, left and right sides of the vehicle body 2 to stably support the vehicle body 2 during work.

In an aerial work vehicle having such a configuration, an operating device for performing the turning operation of the swivel 3, the raising / lowering operation and extension / retraction operation of the boom 4, and the swinging operation of the work table 7 is provided on the work table 7. Upper (this is referred to as upper operating device 10)
And a rear portion of the vehicle body 2 (this is referred to as a lower operation device 20).
And provided. For this reason, the worker who boarded the worktable 7 can control each of the above-mentioned operations by operating the operation lever 11 of the upper operation device 10, and the worker M located behind the vehicle body 2 on the ground can Each of the above operations can be controlled by operating the operation lever 21 of the lower operation device 20.

In the safety device according to the present invention, when the worker M operates the lower operating device 20 to operate the boom as described above, the boom 4 and the work table 7 interfere with the worker M. This is a device that prevents For this reason, a first predetermined area (surrounding area) A1 surrounding the worker M who operates this apparatus 20 is set in advance behind the lower operation device 20, and the worker M is located in the first predetermined area A1. When the lower operating device 20 is operated to restrict the operation of the boom 4 or the workbench 7 trying to enter the inside of the first predetermined area A1, an alarm buzzer, a lamp, etc. Or to activate an alarm.

FIG. 3 shows the configuration of an operation control device including this safety device. This operation control device has a controller 40 to which operation signals from the upper operation device 10 and the lower operation device 20 are input, and the controller 40 generates an up / down actuator 51, a telescopic actuator 52 based on the input operation signals. And the operation of the swing actuator 53 is controlled. The undulating actuator 5
Reference numeral 1 denotes an up / down cylinder 5 and an up / down control valve for controlling the supply of hydraulic oil to the up / down cylinder 5, and controls the operation of the up / down control valve in response to an up / down operation signal from the upper operating device 10 or the lower operating device 20. Undulating cylinder 5
Of the boom 4 is controlled. Similarly, the telescopic actuator 52 is composed of a telescopic cylinder and a telescopic control valve, and the swing actuator 53 is composed of a slewing motor and a slewing control valve. Turn control is performed.

The controller 40 has a surrounding area memory 41 for setting and storing the first predetermined area A1, and a lower operation detecting section 42 for detecting whether or not the lower operating device 20 is operated. The lower operation detecting unit 42 detects an input of an operation signal from the lower operation device 20, and determines whether or not the lower operation device 20 is operated based on the presence or absence of the operation signal. Further, an undulation angle sensor 31 for detecting the undulation angle of the boom 4, a boom length sensor 32 for detecting the extension length of the boom 4, a slewing angle sensor 33 for detecting a slewing angle of the slewing table 3, and a swing angle of the worktable 7. Is input to the controller 40 from the swing angle sensor 34 detecting In the controller 40, from these detection signals,
The positions of the boom 4 and the worktable 7 are calculated and obtained.

In the controller 40, the positions of the boom 4 and the workbench 7 obtained by the calculation are stored in the first predetermined area A1 stored in the surrounding area memory 41.
Boom 4 and work table 7 are partially
It is determined whether or not to enter the predetermined area A1. And
When the lower operation detector 42 detects that the operator M is operating the operation lever 21 of the lower operation device 20, the boom 4 or the workbench 7 may enter the first predetermined area A1. When activated, the alarm 55
(For example, sounding an alarm buzzer or turning on an alarm lamp). At this time, at the same time, the undulating, telescopic and pivoting actuators 5
The operation of the boom 4 or the workbench 7 is restricted such that the operation of the boom 4 or the workbench 7 enters the first predetermined area A1.

When the operation of the actuators 51, 52, 53 is stopped by the alarm operation as described above, the regulation release switch 36 is provided to restart the operation. When the first
The boom operation can be performed, including the operation of entering the predetermined area A1. Note that the boom operation in the direction in which the boom 4 and the worktable 7 are separated from the first predetermined area A1 can be performed without pressing the regulation release switch 36.

For example, a case where the worker M operates the raising / lowering operation lever 21 of the lower operation device 20 to move the boom 4 up and down from the state shown in FIG. 2 will be described. When the boom 4 is raised and lowered and the bottom surface of the worktable 7 moves to a position where it comes into contact with the upper surface of the first predetermined area A1, when the boom 4 is further raised and lowered, the worktable 7 enters into the first predetermined area A1. I do. At this time, the position of the boom 4 and the worktable 7 is detected by the controller 40, and the position of the boom 4 and the workbench 7 is detected. It is determined that it has moved to a position in contact with the upper surface of the first predetermined area A1. Then, when an operation of the up / down operation lever is performed so that the boom 4 is further raised / lowered, an alarm by the alarm 55 and an operation of raising / lowering the boom 4 by the up / down actuator 51 are regulated.

As a result, the boom 4 does not fall down further even if the raising / lowering operation lever is operated to lower and raise, so that the operation of the boom 4 and the worktable 7 to enter the first predetermined area A1 can be performed beforehand and surely. Is prevented. For this reason, the boom 4 and the worktable 7 can be prevented from interfering with the worker M, and the safety during work is improved. Thereafter, the operation operation in a direction to separate the boom 4 and the worktable 7 from the first predetermined area A1 is possible. Further, if the regulation release switch 36 is pressed, all the operation operations including the operation of entering the first predetermined area A1 become possible.

When the operator operates the upper operating device 10 while riding on the work table 7, there is no operator operating the lower operating device 20, so that the above-mentioned alarm 55 is activated by the alarm 55. Not done.

In the above embodiment, the lower operation detector 4
2, the presence or absence of operation of the lower operation means 20 is detected. However, since the operation of the boom and the work table entering the first predetermined area A1 in a state where an operator is in front of the lower operation means 20 is a problem. Alternatively, whether or not an operator is present in front of the lower operation means 20 may be detected. That is, as a different embodiment of the present invention, a sensor using an ultrasonic wave, an infrared ray or the like for detecting when the worker stands in front of the lower operation means 20 is provided, and the presence of the worker is detected by this sensor. When the operation is performed, an alarm operation may be performed for a boom operation in which the boom and the workbench enter the first predetermined area A1. In this case, the size of the worker may be detected by the sensor, and the first predetermined area A1 may be variably set according to the size of the worker.

The operation control device of the present embodiment has a region setting device 35, and the region setting device 35 allows an arbitrary surrounding region (for example, a second region set on the vehicle body) as shown in FIG.
A predetermined area A2, a third predetermined area set around the aerial work vehicle, etc.) are set, and the boom 4 and the workbench 7 are operated in such a manner that the boom moves into the set area. It is also configured so that an alarm operation can be performed. These surrounding areas, that is, the second predetermined area A2 and the third predetermined area A3 are appropriately set so as to surround the luggage or the device when, for example, loading the luggage on or around the vehicle body 2 or providing the device. You.

As a result, the operation in which the boom 4 and the workbench 7 enter into an arbitrary area set by the area setting device 35 is restricted and an alarm is issued. Etc. and boom 4 and workbench 7
Can be prevented beforehand and surely.

The present invention is not limited to the above embodiment. For example, a bending arm that can be vertically extended and retracted or a swing arm that can be turned horizontally is attached to the tip of a boom, and the distal end of the bending arm or the swing arm is attached. The present invention may be applied to an aerial work vehicle having a configuration in which a workbench is attached to a vehicle.

[0027]

As described above, according to the present invention,
When the lower operation detecting means detects that the lower operating means is being operated, or when it is detected that an operator is in front of the lower operating means, the boom and the work are moved to the area around the lower operating means. Since the alarm is activated for the operation of the boom such that the platform enters, the operator operates the lower operating means to activate the boom, and the boom or the platform adjusts the position of the worker. When approaching the surrounding area and intruding into the surrounding area, an alarm is activated by an alarm means, and it is possible to prevent the boom or the work platform from interfering with the worker, thereby preventing the work from being performed. Safety can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an aerial work vehicle equipped with a safety device according to the present invention.

FIG. 2 is a side view of the aerial work vehicle.

FIG. 3 is a block diagram showing a configuration of a safety device according to the present invention.

[Explanation of symbols]

 2 Body 3 Turntable 4 Boom 7 Workbench 10 Upper operating device 20 Lower operating device

Claims (6)

[Claims] 1. A safety device for an aerial work vehicle, comprising: a boom operably disposed on a vehicle body such as a swivel, an up-and-down operation, and an expansion and contraction operation, and a work table attached to a tip of the boom. An upper operation means disposed on the workbench for operating the boom; a lower operation means disposed on the vehicle body for operating the boom; and the upper operation means or the lower operation Operating means for turning, raising and lowering and expanding and contracting the boom in response to operation of the means; lower operation detecting means for detecting the presence or absence of operation of the lower operating means; and operating the lower operating means by the lower operation detecting means. Alarm means for alarming the operation of the boom such that the boom and the workbench enter the area around the lower operation means when the operation of the boom is detected. To become Te safety device of aerial work platforms, characterized in. 2. The vehicle according to claim 1, further comprising: a boom operating position detecting unit configured to detect a turning angle, an elevation angle, and an amount of expansion and contraction of the boom, wherein the warning unit detects the positions of the boom and the worktable detected by the boom operating position detecting unit. The safety device according to claim 1, wherein an alarm operation is performed in response to an operation of the boom that moves into the surrounding area. 3. The safety device according to claim 1, wherein the surrounding area is set as an area surrounding an operator when operating the lower operation unit. 4. When the boom is operated by the operation of the upper operation means, the operation of the boom such that the boom and the workbench enter the area around the lower operation means is allowed as it is. The safety device according to claim 1, characterized in that: 5. A safety device for an aerial work vehicle, comprising: a boom operably disposed on a vehicle body such as a swivel, an up-and-down operation, and an expansion / contraction operation; and a work table attached to a tip of the boom. An upper operation means disposed on the workbench for operating the boom; a lower operation means disposed on the vehicle body for operating the boom; and the upper operation means or the lower operation Operating means for turning, raising and lowering and expanding and contracting the boom in response to operation of the means; lower operating worker detecting means for detecting the presence or absence of a worker at the operating position of the lower operating means; and lower operating worker detecting means When it is detected that an operator is present at the operation position of the lower operation means, the boom and the work table are moved so that the boom and the work table enter the area around the lower operation means. Safety device for aerial platforms, characterized by comprising and a warning means for performing warning operation against. 6. The lower operating worker detecting means is capable of detecting the size of the worker at the operating position of the lower operating means, and changing the surrounding area according to the detected size of the worker. The safety device according to claim 5, wherein the safety device is set.