JPS5822300A - Work safety device for boom loading car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a work safety device for a vehicle equipped with a boom.

Generally, in a boom-mounted vehicle, such as an aerial work vehicle, in order to move the work platform over the entire working range, it is necessary to operate the outriggers to the maximum extended state. Therefore, if the outriggers cannot be extended to their maximum extent, the working range will naturally become narrower.

The present invention has been made in view of these points, and the configuration of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, 1 is the body of an aerial work vehicle V on which a boom 2 is mounted, and a swivel platform 6 is erected at the rear thereof. The boom 2 is composed of a telescopic boom 2&, which is freely telescopic, and a tank boom 21B that is connected to the tip of the telescopic boom 2a and selects between a lateral storage position and an extended working position, and the base end of the telescopic boom 210 is a rotating base. A workbench 4 is mounted on the tip of the auxiliary boom 2b via a connecting member 5.

In addition, seven outriggers 6 are provided at the front and rear sides of the vehicle body 10 so that they can extend freely to the sides, and a jack 7 is provided at the tip of the outrigger 6 so that it can extend and contract downward, and each supports the vehicle body 1 during work. It is something to do.

In addition, although I will not explain in detail, there is a ☆) for the aerial work vehicle V.
An outrigger cylinder that locates the trigger 6, a jack cylinder that extends and retracts the jack 7, a lifting cylinder 8 that raises and lowers the boom 2, a swing motor 9 that turns the swivel base 3 (see figure 1), a telescoping cylinder that extends and contracts the telescoping boom 2, etc. On the other hand, the high-altitude work vehicle is equipped with a work safety device, and this work safety device includes a 119th detection system that detects the turning state of the swivel platform 3, as shown in FIG. Means 1
0. In response to the detection operations of the second detection means 11 and each detection means 10.11 for detecting the extended state of the outrigger 6, boom-related operations in the direction exceeding the work safety limit are controlled, and The boom is comprised of a control means 12 for controlling the boom rotation operation to the other working area.

The first detection means 10 consists of two arc-shaped detection pieces 13 and 14 fixed on the side 41 provided on the swivel table 3. Switches 8Rf and 8Rr are for the front and rear sections.

B and the right side working area 0 are separated and detected. In the clockwise direction, the switch SRf comes into contact with the arc-shaped detection piece 13, and in the counterclockwise direction, the switch 8Rr first comes into contact with the arc-shaped detection piece 13 and is activated. In addition, the switch! ! 11f and SLr are for separating and detecting the front and rear working areas M, B and the left side working area. In the clockwise direction, the switch 81+r is used, while in the counterclockwise direction, the switch 8Lf is used to detect the arc-shaped detection piece 14, respectively. First, it is something that comes into contact and operates.

The second detection means 11 activates the limit switches Rf' and Rr when the outrigger 6 is extended to its maximum extension state.

Lf, TJr are operated.The control means 12, as shown in the electric circuit in Figure 3, includes a power supply 1, limit switches Rr, Lr, and switches ant, SRr,
8Lf.

8Lr, solenoids 15a and 16m of a swing regulating solenoid valve 15.1<S, which will be described later, and a working range regulating circuit 17 are appropriately wired.

By the way, as shown in FIG.
, when moving from B to the right (left) side work area 0 (D), it operates if the outrigger 6 is not fully extended, and stops turning to the side work area 0 (D). . Further, the working range regulation circuit 17 detects the working range determined by the extension amount and core angle of the boom 2, and increases the working range when it is equal to or exceeds a preset safe working range. Boom-related operations in the direction of
This stops the expansion. Note that the switches in the electric circuit shown in FIG. 3 are all in an activated state.

Therefore, when it becomes necessary to work at heights, a hydraulic power source (not shown) is used to perform work at high places. When the Shirt Dragon 7 is extended, the first switch is activated.

Xar switches to upper position. Therefore, the current from the power supply 1 flows through the switch if, Rr or the switch Lr.
It flows through the work range regulation circuit 17, and when the work platform 4 is placed within the safe work range regulated by the circuit 17, no hindrance (boom related operation) is possible.

On the other hand, if, due to road conditions, it is not possible to extend the right ARA (13 gal), the limit switches Re and Rr will be inoperative and their contacts will remain in the downward position, so the control means 12 will not be able to rotate. The rotation is restricted depending on the rotation state of the table 6. That is, when the workbench 4 is in the front work area or the rear work area 1, the switch
Since fsRt, 8Rr, SLr, and 8Lf are held in the lower position, the current is input to the work range regulation circuit 17, and if it is within the safe work range, boom-related operations can be performed freely. In this case, when the swivel base 3 turns from the front work area M to the right side work area 0, the switch 8Rf contacts the cam 15 and switches to the upper position, and as a result, the current flows through the solenoid of the solenoid valve 15 for regulating right turn. 15& is energized.

As a result, the right turning operation is stopped.

As described above, in the present invention, the control means for controlling the boof-related operation in the direction exceeding the safety limit and for controlling the swing operation to the side work area is controlled by the swing state of the swing base and the actuator. Since it is activated depending on the extended state of the workpiece, high-place work can be carried out safely and automatically in accordance with each work state.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall side view of the vehicle for aerial work, FIG. 2 is a partially omitted schematic plan view of the vehicle for aerial work, and FIG. 3 is an electrical diagram of the control means. The circuit diagram and FIG. 4 are partially omitted hydraulic circuit diagrams for the swing motor. 2-0 Poom, 4...Work, 6--Ausiriga 9
...Swivel motor, SR1, IRr, EIXaf,
8Lr battle*s switch, Rf, Rr, Lf,
Lr...Limit switch, 15116...Solenoid valve for swing regulation, 17@...Working range regulation circuit

Claims (1)

[Claims] (1) A telescoping boom is pivotally supported in a layered manner on a swivel platform mounted on the vehicle body, while outriggers are provided on the vehicle body so that they can freely extend to the sides, and a jack is attached to the tip of the outrigger to support the vehicle body. In a boom-mounted vehicle that is extendably provided with a boom tower, the first detection means detects the turning state of the swivel base, and the boom-related operation in the direction exceeding the safety limit of (a) is controlled. 1. A work safety device for a boom tower-mounted vehicle, characterized in that it is provided with a control means for controlling boom turning operation to a working area. (2) The work safety device for a boom tower-mounted vehicle according to claim 1, wherein the seventh detection means comprises a switch for detecting the turning position of the side castle.