JPH01271534A - Safety device for construction vehicle having upper part turning structure - Google Patents

Abstract

PURPOSE:To enhance safety by setting up an ultrasonic sensor in a turning structure in its one part and stopping turning the turning structure when a human body or an obstacle is sensed by this ultrasonic sensor. CONSTITUTION:A pressure of oil, generated in an oil hydraulic pump 21 driven by an engine 20, is supplied to a turn motor 24 through a turn valve 22. The turn valve 22 is placed in its position A, when the turn motor 24 performs a right turn, a solenoid selector valve 23 is switched to a position C when an ultrasonic sensor 7 senses an obstacle, and a pressure oil circuit to the turn motor 24 is disconnected, stopping its rotation. When an obstacle is sensed by an ultrasonic sensor 8, also the solenoid selector valve 23 is similarly switched to a position D, and the rotation of the turn motor 24 is stopped.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a safety device for a construction vehicle having an upper revolving structure such as a power sill when turning, and prevents a collision by not only giving a warning but also stopping the turning itself. Regarding equipment.

(Prior Art) Conventionally, as this type of safety device, a warning device such as a warning light, a buzzer, etc. installed on the revolving body is known.

(Problem to be Solved by the Invention) Conventional safety devices only provide a warning, but if the warning is ignored or the warning is not noticed, the warning has no effect. In addition, there was a need for a safety device that would automatically detect obstacles and stop turning.

(Means for Solving the Problems) The present invention has been made in view of the above-mentioned problems, and includes an ultrasonic sensor (ultrasonic transmitter and receiver) installed in a part of the upper revolving body, This system provides a system in which an ultrasonic sensor detects when a vehicle enters the rotation range of a rotating body and stops the rotation.

(Operation) When a person or an obstacle enters the turning range of the rotating body, the ultrasonic waves emitted from the transmitting device of the ultrasonic sensor are reflected by them, and the receiving device senses this. The received signal interrupts the hydraulic circuit of the swing drive hydraulic motor,
This is to stop the hydraulic motor.

If you need work that does not require an ultrasonic sensor,
It is also possible to turn off the sensor switch so that the ultrasonic sensor does not operate.

(Example) Examples will be described based on the drawings.

Figure m1 is an overall top view of the power shovel, Figure 2 is a side view, and Figure 3 is a front view.

In FIG. 2, 1 is a traveling device, 2 is an upper revolving body mounted on the traveling device so as to be able to rotate horizontally, and 3 in FIG. 1 is the center of rotation of the upper revolving body 2. In FIG.

Reference numeral 4 designates a boom that is pivotally attached to the upper revolving body with a pin 11, 5 is an arm that is pivoted to the boom 4 with a pin 12, and 6 is a packet that is attached to the arm 5 with a pin 13.

7.8 is an ultrasonic sensor that can transmit ultrasonic waves and receive reflected waves from people or objects that have entered the rotation range, and is installed on both the left and right sides of the upper rotating body 2 as shown in the figure. ing.

FIG. 4 is a diagram showing the turning range, and the turning range is a circle 9 with a turning radius R when the boom 4-7-5 is operated so that the packet 6 is farthest from the turning center.

If 10 is a person or an obstacle that has entered the circle 9 with the radius R, the ultrasonic wave emitted from the excess sound sensor 7 hits lO and is reflected, and the receiving part of the sensor receives it and receives the oil pressure as described later. A circuit is activated to stop the rotation.

FIG. 5 is a circuit diagram showing the relationship between the ultrasonic sensors 7 and 8 and the hydraulic system for rotating the upper revolving structure 2. As shown in FIG.

Pressurized oil generated by a hydraulic pump 21 driven by an engine 20 is switched to A or B by a rotating pulp 22, thereby causing a rotating motor 24 to rotate to the right or to the left. Now the swing valve 22 is in position A and the swing motor 24
When the is turning to the right, if the ultrasonic sensor 7 detects an obstacle, the electromagnetic switching valve 23 transmits the signal from the ultrasonic sensor 7 through the conductor 31! of the break switching valve 23.

The position is switched to C, the hydraulic circuit to the swing motor 24 is cut off, and its rotation is stopped. When an obstacle is detected by the ultrasonic sensor 8, the electromagnetic switching valve 23 is similarly switched to position D by the conductor 32, similarly cutting off the hydraulic circuit to the swing motor and stopping its rotation.

When the sardine sensor is not used, a switch may be provided on the conductive wires 31 and 32 to turn them off. Note that 25 corresponds to the upper revolving structure 2 in FIG. 2.

(Effect of the invention) Since the present invention is configured as described above.

This produces the following effects.

With conventional warning and warning methods alone, collisions with people or objects that are ignored or that enter the turning range without realizing it are unavoidable and extremely dangerous; however, the present invention eliminates these situations. It is also possible to automatically stop turning when the vehicle is turned, making it extremely practical as a safety device.

[Brief explanation of the drawing]

Fig. 1 is an overall plan view of the power shovel, Fig. 2 is a side view, Fig. 3 is a plan view, Fig. 4 is an explanatory diagram of the turning range and its relationship with obstacles, and Fig. 5 is an ultrasonic wave. FIG. 3 is a circuit diagram showing the relationship between a sensor and a hydraulic circuit. 2... Upper rotating body 7.8... Ultrasonic sensor 9.
...Turning range 10...Person or obstacle Patent applicant Komatsu Ltd. Representative (patent attorney) Oka 1) Kazuki Figure 4 Figure 5

Claims (1)

[Claims] In a construction vehicle with an upper revolving body, an ultrasonic sensor that can receive and transmit is installed on a part of the revolving body, and when a person or an obstacle enters the turning range of the revolving body, this is detected and the rotation is stopped. 1. A safety device for a construction vehicle having a revolving upper body, characterized in that the vehicle can be rotated.