JPH0625518Y2 - Arm swing signal transmission device of Nibucket type aerial work vehicle for electric work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) In this invention, the first and second arms are attached to the distal end of a telescopic boom that can be undulated so that its base end can be horizontally swiveled. In a two-bucket type aerial work vehicle for electrical work, in which the first and second buckets are attached to the tips of the second arms, a bucket that responds to a turning signal of the arm while ensuring electrical insulation between the two buckets. The present invention relates to an arm turning signal transmission device for an aerial work vehicle for transmission to an aerial work vehicle.

(Technical Background and Prior Art) As shown in FIGS. 1 and 2, the aerial work vehicle for electric work as described above is configured such that as shown in FIG. 1 and FIG. 3 is provided, and the first and second arms 4 and 5 having the base end portions thereof horizontally attached to the distal end portion of the telescopic boom 3 are provided.
And the first and second arms at the tips of the second arms 4 and 5, respectively.
It is configured by attaching buckets 6 and 7. First and second arms for driving the first and second arms 4 and 5 respectively are provided on the base end side of the first and second arms 4 and 5, respectively.
First and second hydraulic motors 8 and 9 for arm drive are provided. Further, the first hydraulic motor 8 for driving the first arm swinging is provided with the hydraulic control device 8a provided in the first bucket 6.
The second hydraulic motor 9 for driving the turning of the second arm is operated by the hydraulic control device 9a provided in the second bucket 7. Between the base end portion of at least one of the first and second arms 4 and 5 and the first bucket 6 attached to the tip end portion of the first arm 4, insulation made of an electrically insulating material is provided. A section 10 is interposed, which constitutes an electrical insulation between the first and second buckets 6, 7. The first hydraulic motor 8 and the hydraulic control device 8a provided in the first bucket 6 for operating the first hydraulic motor 8 are also connected by a pair of electrically insulating hoses. An insulating section 11 made of an electrically insulating material is also provided in a part of the telescopic boom 3. The pressure oil for driving the first hydraulic motor 8 and the second hydraulic motor 9 is sent from the base end side of the telescopic boom 3 to the hydraulic control devices 8a and 9a via an electrically insulating hose, and also the hydraulic control device 8a. And 9a are circulated to the base end side of the telescopic boom 3 via an electrically insulating hose. The second hydraulic motor 9 and the second hydraulic motor 9
Control device provided in the second bucket 7 for operating
The pair of hoses are also connected between 9a, but the pair of hoses do not necessarily have to be electrically insulating hoses.

The above aerial work vehicles for electrical work are the first and second
Workers board the buckets 6 and 7, respectively, to work in high places. At that time, a worker who has boarded the first bucket 6 drives the first arm 4 to rotate by operating the hydraulic control device 8a, and a worker who has boarded the second bucket 7 must operate the hydraulic control device 9a. The second arm 5 is driven to rotate. For turning the swivel base 2, hoisting and retracting the telescopic boom 3, a hydraulic control device (not shown) provided on the swivel base 2 side may be operated by another worker on the swivel base 2 side. Alternatively, an operation signal generator is arranged in each of the buckets 6 and 7, the signal generated by the operation signal generator is converted into an optical signal, and then the optical signal is guided to the swivel base 2 side, where it is converted into an electric signal again. After the conversion, the signal is used to operate a hydraulic control device (not shown) that controls the swing of the swivel base 2, the ups and downs of the telescopic boom 3, and the extension and extension.

In the conventional two-bucket type aerial work vehicle for electrical work configured as described above, after the tip end portion of the telescopic boom 3 is localized at an arbitrary position, an operator who has boarded each bucket 6 and 7
Since the corresponding arms 4 and 5 can be pivoted to pivot the buckets 6 and 7 individually,
It is possible to carry out electrical work in high places extremely effectively. Moreover, since the three members of the first bucket 6, the second bucket 7, and the vehicle 1 are electrically insulated, the workers on the first and second buckets 6, 7 are protected from an electric shock accident. There is.

By the way, generally, in an aerial work vehicle with a swingable arm attached to the end of a telescopic boom and a bucket for the operator to ride on the end of the arm, the moment of fall direction acting on the telescopic boom is limited. When the value reaches the value, the bucket's working radius (horizontal distance from the hoisting fulcrum of the telescopic boom) increases, in other words, the swaying motion of the arm in the direction of increasing the fall direction moment acting on the telescopic boom is automatically increased. A controlled arm turning control system is installed to prevent the work vehicle from falling over due to the turning motion of the arm. As shown in Japanese Utility Model Laid-Open No. Sho 58-180900, this arm swing limiting system is provided at the center of swing of the arm, that is, the swinging state of the arm, that is, the right swinging arm when viewed from the base end side of the telescopic boom. The arm rotation state detector that generates a signal to determine whether it is in the area state or the left area state in which the vehicle is turning to the left, and when the fall direction moment acting on the telescopic boom mounted on the turntable reaches the limit value. A limit signal generator that detects and outputs a limit signal, and an operating means of a hydraulic control device for turning the arm provided in the bucket are operated to turn left with the arm or turn right. Is provided with an operation state detector that detects whether or not it is in an operated state, and guides the generated signals of the arm rotation state detector and the limit signal generator to the bucket, and When the limit signal generator is outputting the limit signal, the arm is in the right area state and left-handed, using the detection signals of the three of the swing state detector, the limit signal generator, and the operation state detector. The operation signal of the operating means is made impossible to be transmitted to the hydraulic control device or is supplied to the hydraulic control device when it is operated to rotate and when the arm is in the left region state and is operated to turn right. The unload valve that unloads high-pressure oil is activated.

When attempting to adopt this type of arm turning restriction system in a two-bucket type aerial work vehicle for electric work that includes the first and second arms as described above, the turning centers of the first and second arms 4 and 5 are It is necessary to provide an arm turning state detector for generating a signal for discriminating the turning state of each of these arms, and to transmit the detection result to the corresponding bucket.

(Problems to be solved by the invention) In this case, the detection result of the arm rotation state detector of the first arm 4 having the insulation section is used to maintain the electric insulation between the tip of the telescopic boom 3 and the first bucket 6. However, it is necessary to transmit to the first bucket 6, but since there is no suitable method, in the two-bucket type aerial work vehicle for this kind of electric work, the above-mentioned is applied to the first arm side having an insulation section. There is a problem in that it is not possible to provide an arm turning restriction system such as this.

In order to solve the above problems, the present invention provides a two-bucket type aerial work vehicle for electric work, which is provided at the base end of the first arm 4 having an insulating section or at the tip of the telescopic boom 3.
An arm swivel signal for transmitting the detection result of the arm swivel state detector of the first arm 4 that generates an electrical signal for determining the swivel state of the first arm 4 to the first bucket 6 side while maintaining electrical insulation. It is intended to provide a transmission device.

(Means for Solving the Problems) The arm swing signal transmission device of the two-bucket type aerial work vehicle for electric work of the present invention is configured as follows to achieve the above object.

That is, the detection result of the first arm turning state detector that is provided at the base end portion of the first arm 4 having the insulating section or the tip end of the telescopic boom 3 and that outputs the turning state of the first arm 4 as an electric signal is output. , When electrically insulatingly transmitting to the first bucket 6, the output electric signal of the first arm turning state detector is transferred to the electric signal-optical signal converting means provided in the second arm 5 or the second bucket 7 via an electric wire. It is configured such that it is guided, converted into an optical signal there, and then transmitted to the first bucket 6 via an optical fiber cable.

(Operation) With the above-described configuration, the power source mounted on the second arm 5 side, that is, the second arm 5 or the second bucket 7 is used to generate an electric signal as an output detected by the first arm turning state detector. It can be converted into a signal and transmitted to the first bucket 6 in an electrically insulating manner. The optical signal transmitted to the first bucket 6 is converted into an electric signal by the optical signal-electrical signal converting means there and used as an input signal to the arm turning restriction system and the like.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG. In FIG. 3, the portions corresponding to the corresponding portions of the two-bucket type aerial work vehicle shown in FIGS. 1 and 2 and described above are designated by the same reference numerals.

In FIG. 3, reference numeral 12 denotes a first arm turning state detector which is provided at the base end portion of the first arm 4 (or the tip end portion of the telescopic boom 3) and which detects and outputs the turning state of the first arm 4 as an electric signal. is there. The first arm turning state detector 12 is composed of a limit switch or a potentiometer. Reference numeral 13 is a power source (battery) provided in the second bucket 7. The first arm turning state detector 12 is a power source.
The electric wire is electrically input from 13 through the electric wire 14 arranged along the second arm 5, and the output signal thereof is the electric wire arranged along the second arm 5.
Electrical signal-optical signal converting means 16 provided on the second arm 5 or the second bucket 7 (the second bucket 7 in this example) via 15
Leading to. The electric signal-optical signal converting means 16 converts the electric signal output from the first arm turning state detector 12 into an optical signal, and converts the converted optical signal into the first bucket 6 via the electrically insulating optical fiber cable 17. I am trying to reach you. First bucket 6 via fiber optic cable 17
The optical signal transmitted to the first bucket 6 is converted into an electric signal again by the optical signal-electrical signal converting means 18 provided in the first bucket 6,
Used as a signal for the first arm turning restriction system 19. In FIG. 3, reference numeral 20 denotes a power source (battery) provided in the first bucket 6, which is used as an operating power source for the optical signal-electrical signal converting means 18 and the first arm turning restriction system 19. The first arm turning restriction system 19 includes a first arm turning state detector 12 and a hydraulic control device 8.
a, the operation state detector 8b, and a limit signal generator (which is provided on the swivel base 2) that detects when the falling direction moment acting on the telescopic boom 3 reaches a limit value and outputs a limit signal. ) Is operated as described in the background of the above-mentioned technology and the section of the prior art, but the limit signal from the limit signal generator provided on the swivel base 2 is as shown in FIG. It is led to the optical signal-electrical signal converting means 18 of the first bucket 6 via the electrically insulating optical fiber cable 21, where it is converted into an electric signal and transmitted to the first arm turning restriction system 19. The present invention is only an example of use in the first arm turning restriction system 19, and the present invention is not limited to this, and may be used when displaying the turning state of the first arm 4 on the first bucket 6. It is a good one.

(Effect) In any case, the arm swing signal transmission device of the two bucket type aerial work vehicle for electric work of the present invention does not impair the electric insulation of the insulating side arm, that is, the first arm 4,
The turning signal of the first arm 4 can be transmitted to the corresponding bucket, that is, the first bucket 6, which is a great practical effect.

[Brief description of drawings]

1 and 2 are explanatory views of a two-bucket type aerial work vehicle for electric work. FIG. 1 is a side view thereof, and FIG. 2 is a plan view of the vicinity of the telescopic boom tip of FIG. FIG. 3 is an explanatory view of an embodiment of the present invention. 3; telescopic boom, 4; first arm, 5; second arm,
6; first bucket, 7; second bucket, 10; insulation section,
12; first arm turning state detector, 14, 15; electric wire, 16; electric signal-optical signal converting means, 17; optical fiber cable,

Claims (1)

[Scope of utility model registration request] 1. A first and a first telescopic boom mounted on a vehicle so that the telescopic boom can be raised and lowered so that the telescopic boom can be driven to move up and down, and the base end of the telescopic boom can be horizontally swiveled. Two arms are provided for the first and second
The first and second buckets are attached to the tip ends of the arms, respectively, and the first and second buckets are provided on the base end sides of the first and second arms, respectively.
And driving of the first and second hydraulic motors for swinging the second arm is controlled by arm swinging control devices provided in the first and second buckets, respectively, and further, the first and second arms An insulating section made of an electrically insulating material is interposed between the base end portion of at least one of the first arms and the first bucket attached to the tip end portion of the first arm, and the first arm pivotally drives the first arm. A hydraulic motor for one-arm swivel drive and the arm swivel control device provided in the first bucket for controlling the drive of the hydraulic motor for the first arm swivel drive are electrically connected, and a part of the telescopic boom is provided. In a two-bucket type aerial work vehicle for electrical work in which an insulating section made of an electrical insulating material is interposed, a swivel of the first arm is provided at a base end of the first arm or a telescopic boom tip. When the detection result of the first arm turning state detector for detecting and outputting the state as an electric signal is transmitted to the first bucket in an electrically insulating manner, the output electric signal of the first arm turning state detector is transferred to the first bucket via an electric wire. 2 arms or 2nd
A two-bucket type aerial work for electrical work, characterized in that it is configured to be guided to an electric signal-optical signal converting means provided in a bucket, converted into an optical signal there, and then transmitted to the first bucket via an optical fiber cable. Car arm turn signal transmission device.