JP2003168174A - Construction machine and worker contact prevention system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reliably detect only an operator without malfunction or blind spot in a detection range. A construction machine 1 includes a receiving antenna 8, a control device 10, alarm output devices 9 and 11, and a transmitter 13 mounted on an operator M, wherein the control device is a construction machine. When the distance is determined to be within a predetermined distance, an alarm is issued. Alternatively, when it is determined that the distance is within the predetermined distance, the operation of the construction machine is emergency stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for preventing contact between a construction machine and an operator.

[0002]

2. Description of the Related Art Accidents in which a worker comes into contact with a construction machine such as a drag shovel (backhoe excavator) that frequently turns, or is caught between an existing column or wall, a temporary structure, or equipment. There is no end. In order to prevent such accidents, in the public notice on the industrial accident prevention plan issued in March 1998, one of the construction industry's measures was "construction by developing and disseminating detection devices for contact accident prevention. "Improving the safety of machinery, etc."

Conventionally, in order to prevent such a contact accident, a direct operation system in which a contact sensor composed of a cushion is attached to a construction machine, or an indirect operation in which a construction machine is provided with an optical sensor or an ultrasonic sensor to detect an operator. System devices are commercially available.

[0004]

However, in any of the above-mentioned conventional methods, the work efficiency of the construction machine is lowered because it reacts with a person other than the operator such as the embankment, the pillar, the wall, and the equipment. There is a problem that the detection range has a blind spot and a non-detection range occurs, resulting in lack of reliability. In addition, the direct operation method has a problem that it is easily broken or damaged, and the indirect operation method has a malfunction due to a peripheral environment (electromagnetic noise, moisture, moisture, noise, light, etc.) and lacks reliability. I have a problem. Therefore, the above-mentioned commercially available device is not popular at present.

The present invention solves the above-mentioned conventional problems, and provides a contact prevention system between a construction machine and a worker, which is capable of reliably detecting only a worker without malfunction or blind spots in a detection range. The purpose is to do.

[0006]

To achieve the above object, a contact prevention system for a construction machine and a worker according to claim 1 of the present invention is provided with a receiving antenna disposed on the construction machine.
A control device and an alarm output device, and a transmitter mounted on the worker are provided, and the control device calculates a distance between the construction machine and the worker, and issues an alarm when it is determined that the distance is within a predetermined distance. The invention according to claim 2 is characterized in that the operation of the construction machine is emergency stopped when it is determined that the distance is within the predetermined distance.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of a system for preventing contact between a construction machine and an operator according to the present invention. FIG. 1 shows an example of a construction machine according to the present invention,
1A is a plan view, FIG. 1B is a side view, and FIG. 2 is FIG.
2A is a plan view and FIG. 2B is a side view.

In FIG. 1, a construction machine 1 is an example of a drag shovel, and can freely rotate on a caterpillar 2, a machine body 3 supported on the caterpillar 2, a counterweight 4 installed on the machine body 3, and a counterweight 4. It is equipped with a swivel arm 5 mounted on the vehicle, a shovel 6 connected to the tip of the swivel arm 5, a driver's seat 7 installed on the machine body 3, and the like. A receiving antenna 8 is provided on both sides of the rear part of the counterweight 4.
And a speaker 9 which is an external alarm signal output device is arranged at the center of the rear part. The number of receiving antennas 8 is arbitrary.

A control device 10 connected to a receiving antenna 8 is connected to the driver's seat 7, and an alarm device 11 as an internal alarm signal output device is arranged on the front surface of the driver's seat 7. The worker M wears the helmet 12.

As shown in FIG. 2, three ID tags (transmitters) 13 are arranged inside the helmet 12. The number of ID tags 13 provided is arbitrary.
The ID information (identification information) of the worker is stored in the ID tag 13, and the RF of several 100 kHz to several GHz is stored.
An ID (Radio Frequency Identification) is selected for transmission.

FIG. 3 is a block diagram of a control system showing an embodiment of the contact prevention system between a construction machine and a worker according to the present invention. FIG. 3 shows the ID tag 13, the receiving antenna 8, the control device 10, the external alarm signal output device 9, and the internal alarm signal output device 11 of the worker M described with reference to FIGS. 1 and 2. In addition, 14 is a power supply (heavy equipment battery).

A radio signal transmitted from the ID tag 13 of the worker M is received by the receiving antenna 8 and transmitted to the control device 10. In the control device 10, the distance between the construction machine 1 and the worker M is calculated, and when it is determined that the distance is within the predetermined distance, the control signal is sent to the external alarm signal output device 9 and the internal alarm signal output device 11. Send a feed alarm. It should be noted that the turning signal, the forward-backward movement, and the like of the construction machine 1 may be emergency stopped by this control signal.

This system is positioned as a preventive maintenance type safety device which detects an approach to a dangerous position (about 1 to 3 m) close to a contact or pinch position and issues an alarm in advance.

[0014]

As is apparent from the above description, according to the present invention, the operating speed of the construction machine, the surrounding environment / atmosphere (especially electromagnetic noise, etc.), the detection blind spot (the detection range limitation due to the directivity of the radio wave used) ) Etc. to improve the malfunction and inoperability, the frequency of the radio wave used, RFID of several 100 kHz to several G hertz can be selected, and the worker wears an ID tag, so it does not respond to anyone other than the worker. There is no unnecessary operation. The receivable distance of RFID is several tens of cm to several m (4 m at the microwave level as an example), avoiding unnecessary operations, highly reliable as a pinched contact detection sensor, and inexpensive to manufacture. You can

[Brief description of drawings]

1 shows an example of a construction machine according to the present invention, and FIG.
1A is a plan view and FIG. 1B is a side view.

2 shows the helmet of FIG. 1 and FIG. 2 (A) is a plan view,
FIG. 2B is a side view.

FIG. 3 is a configuration diagram of a control system showing an embodiment of a contact prevention system between a construction machine and an operator of the present invention.

[Explanation of symbols]

1 ... Construction machinery 8 ... Receiving antenna 9, 11 ... Alarm output device 10 ... Control device 13 ... ID tag (transmitter) M ... Worker

Continued front page    F-term (reference) 2D015 GA03 GB06                 5C086 AA53 BA19 CA06 CA25 CB40                       DA08 EA08 EA17 EA45 FA02

Claims (2)

[Claims] 1. A receiving antenna, a control device, and an alarm output device, which are arranged on a construction machine, and a transmitter mounted on a worker, wherein the control device controls the distance between the construction machine and the worker. A system for preventing contact between a construction machine and a worker, which calculates and issues an alarm when it is determined to be within a predetermined distance. 2. The system for preventing contact between a construction machine and an operator according to claim 1, wherein the operation of the construction machine is stopped in an emergency when it is determined that the distance is within the predetermined distance.