JP2000191278A - Warning system for crane operation - Google Patents

Abstract

(57) [Summary] [PROBLEMS] The present invention relates to an alarm system in a crane operation, and an object of the present invention is to further enhance the safety of the crane operation . On the lane 11 side, a jib 13 is provided with an alarm transmitter 14, and a revolving unit 11 a is provided with an operator detection alarm transmitter 12, an operator display device, and a control device, and on a worker 15 side. Is provided with a receiver and an alarm confirmation switch, and issues an alarm with the two transmitters 12 and 14 on the crane 11 side to cause the worker 15 to recognize that he / she is within the danger range, and to provide an alarm on the worker 15 side. An alarm system for crane operation, in which the crane side also confirms safety with a confirmation signal from a confirmation switch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warning system in a crane operation, and more particularly, to a worker who has received an alert from a crane side to not only evacuate but also voluntarily take care of the warning. The present invention relates to an alarm system constructed so as to confirm safety by receiving a confirmation signal from a worker, communicate with the worker and a crane operator to further enhance safe work.

[0002]

2. Description of the Related Art Hitherto, various improvements have been proposed in crane operations in order to prevent accidents caused by falling of suspended loads. For example, as shown in FIG. 6, a projection device 7 is provided at the tip of the jib 2 of the crane 1. A certain range of danger zone 8 (for example, 8a, 8b) is formed by the projection device 7 vertically below by illumination of colored light.

[0003] Workers 4 can be put on, for example, a helmet, shoulders, wrists, etc. of the head, which are clothes or parts of the body.
The ultrasonic alarm device 9, the color display device, and the voice alarm device are attached.

The ultrasonic alarm device 9 is electrically connected to an ultrasonic transmitter for transmitting ultrasonic waves upward, an ultrasonic receiver for receiving the ultrasonic waves, and the ultrasonic transceiver. And a control unit.

[0005] A color display device and an audio alarm device are electrically connected to the ultrasonic alarm device 9 respectively. In the color display device, for example, a green, yellow, or red lamp or a thin plate-like EL (electroluminescence) is appropriately selected and turned on by a command from the control device via a driver.

The voice alarm device emits a high-pitched sound as a warning sound, for example, from a speaker of the main body of the device in response to a command from the control device, or outputs a "dangerous" sound from a speaker via an amplifier by a voice synthesis device. Please evacuate. "(Japanese Patent Laid-Open No. 10-7384).

[0007]

However, in the crane alarm device according to the above-mentioned conventional example, for example, when the signal is transmitted only from the crane tip of the crane, the shadow of the suspended load 6 becomes blind spot and may not react. There is a problem that the worker may overlook the color-based reception warning, and there is a shortage of time from confirming the warning to evacuating because the warning is immediately below a suspended load. The alarm system according to the present invention is proposed to solve such a problem.

[0008]

The gist of the present invention for solving the above-mentioned problems of the crane operation alarm system according to the present invention is as follows.
On the crane side, an alarm transmitter is provided on the jib, and a worker detection warning transmitter, a worker display device, and a control device are provided on the revolving unit, and a receiver and an alarm confirmation switch are provided on the worker side. A warning is issued by two transmitters on the crane side to make the worker recognize that he is in the danger area, and the crane side also confirms safety by a confirmation signal from the worker's alarm confirmation switch. It is.

[0009] Further, when the confirmation signal from the worker cannot be received in response to the alarm by the alarm transmitter of the jib, the control device may prevent the crane's suspended load from lowering.

According to the warning system for crane work according to the present invention, not only can the worker confirm the warning from the two transmitters on the crane side, but also the crane operator can monitor the worker with the monitor. Can be confirmed to be within the danger range, and it can be confirmed that the worker has recognized the alarm. Therefore, communication regarding work danger is established between the crane operator and the worker, and safety is enhanced. Furthermore,
The forcible drop of the suspended load by the control device also prevents human error in operation.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an alarm system for a crane operation according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the revolving unit 11 of the jib crane 11
a is provided with a radar transmitter 12 which is a worker detection alarm transmitter. A transmitter 14 is provided at the tip 13a of the jib 13 as a warning transmitter.

In the worker 15, as shown in FIG. 2, a receiver 17 is provided on a helmet 16 on the head.
When the receiver 17 receives a signal from the radar transmitter 12, a sound generator for warning is produced by a sound generator installed in the receiver.

The receiver 17 has a vibration device built therein. When a signal from the transmitter 14 is received, the vibration device operates to operate in a stepwise (strong or weak) manner.
(Discontinuous) vibrations are reliably transmitted to workers as alarms.

Further, the receiver 17 is provided with an alarm confirmation switch. When the signal of the radar transmitter 12 is received, the worker 15 confirms the reception, and presses the alarm confirmation switch, whereby a confirmation signal is returned to a monitor, which will be described later, of the revolving unit 11a of the jib crane 11, For example, a red mark indicating the worker 15 is changed to a blue mark and displayed. Thus, the alarm system is provided with the alarm confirmation means. The radar transmitter 12, the transmitter 14, and the monitor are each connected to a control device.

The revolving superstructure 11a is provided with a receiver for receiving the reflected wave together with the radar transmitter 12, and is displayed on a monitor in an operator room. On the monitor, each worker 15 within the radar detection range A is displayed with a red mark, so that the arrangement of the workers within the crane operation dangerous range can be grasped at a glance.

According to the alarm system of the present invention configured as described above, referring to FIGS. 3 to 5, during the crane operation of the jib crane 11, the jib 13 is suspended while the suspended load 18 is suspended. When rotated in a desired direction, the worker 15 within the sensing range A of the radar transmitter 12 is displayed as a red mark on the monitor of the revolving unit 11a. Thereby, the crane operator in the operator room recognizes that the worker 15 is within the crane operation dangerous range. Here, the crane operator temporarily stops the progress of the suspended load operation.

The workers 15a and 15b receive a warning signal from the radar transmitter 12, and the receiver 17 uses a voice for warning, for example, a voice synthesizer to say, "The cargo approaches. Please be careful." Since a small chime sound or the like is uttered, it is recognized that the user is in the danger area, and the user can prepare for evacuation.

Then, when the workers 15a and 15b press the alarm confirmation switch, the red mark on the monitor changes to a blue mark. Thus, it is confirmed by the crane operator that the workers 15a and 15b recognize that the suspended load 18 is approaching in their own direction.

When the marks indicating the presence and position of the worker displayed on the monitor are all blue marks, the operation of the crane is restarted. Next, when the worker 15c is directly below the suspended load 18 (range B), the vibrating device is operated by the receiver 17 of the worker 15c immediately below by the alarm signal from the transmitter 14, and the vibration is directly generated. It is transmitted to the worker 15c in a targeted and reliable manner.

Further, since the alarm signal from the radar transmitter 12 and the alarm signal from the transmitter 14 at the jib tip 13a are simultaneously received, a voice with a high urgency, for example, "a cargo is coming directly below." Please leave the place. "Or a loud chime will be spoken.

In this state, the mark indicating the worker 15c immediately below the suspended load 18 is a red mark on the monitor. Then, when the worker 15c presses the second alarm confirmation switch, the red mark on the monitor changes to blue. The crane operator confirms that the worker 15c has separated from immediately below the suspended load 18 by looking at the monitor, and lowers the suspended load 18. In addition, as another embodiment, when the worker 15 exists immediately below the suspended load 18, the wire driving device of the jib crane 11 is stopped so that the suspended load 18 cannot be forcibly lowered. To Thereby, safety can be ensured.

As described above, not only the alarm is issued to the worker, but also the warning is confirmed by the worker, and the fact that the worker is aware of the danger can be confirmed by the crane operator. Thereby, the safety of the crane operation is further improved.

[0023]

As described above, in the crane operation alarm system according to the present invention, an alarm transmitter is provided on the jib on the crane side, and a worker detection alarm transmitter and a worker display are provided on the revolving unit. Providing a device and a control device,
On the worker side, a receiver and an alarm confirmation switch are provided, and a warning is issued by two transmitters on the crane side so that the worker can recognize that he / she is within the danger area, and an alarm confirmation switch on the worker side. The safety signal is also checked on the crane side by the confirmation signal of the crane side, so the crane side and the worker side confirm the safety with each other, and by communicating both, the excellent effect that the safety of the crane work is surely enhanced To play.

When the confirmation signal from the worker cannot be received in response to the alarm from the jib warning transmitter, the control device prevents the suspended load of the crane from lowering. An operational effect can be prevented, and an excellent effect that safety is further improved can be achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an alarm system according to the present invention.

FIG. 2 is an explanatory diagram showing a state in which a worker-side receiver is provided in the alarm system according to the present invention.

FIG. 3 is an explanatory diagram showing a flow of a safety confirmation method by the alarm system according to the present invention.

FIG. 4 is an explanatory diagram showing a use state of the alarm system according to the present invention.

FIG. 5 is an explanatory diagram showing a use state of the alarm system according to the present invention.

FIG. 6 is an explanatory diagram showing a configuration of an alarm system according to a conventional example.

[Explanation of symbols]

11 jib crane, 11a revolving superstructure, 12 radar transmitter, 13 jib, 13a jib tip, 14 transmitter, 15 workers, 15a, 15b, 15c workers, 16 helmet, 17 receiver, 18 load.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Junji Koyama 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. Tokyo Branch (72) Inventor Masashi Tsumura 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. Tokyo Branch (72) Inventor Naoki Sakurada 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. Tokyo Branch (72) Inventor Hisanori Okura 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Corporation Tokyo Branch (72) Inventor Yoshinori Oe 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Corporation Tokyo Branch (72) Inventor Shinji Sakuma 1-7- Kyobashi, Chuo-ku, Tokyo 1 F-term in the Tokyo branch of Toda Construction Co., Ltd. (reference) 3F204 AA04 CA05 DA08 FA02 FB18 FC04 FC05 FC06 FC08 FD01

Claims (2)

[Claims] A crane is provided with an alarm transmitter on its jib, an operator detection alarm transmitter, an operator display device, and a control device on a revolving unit.
Providing a receiver and an alarm confirmation switch, the two transmitters on the crane side issue an alarm to make the worker recognize that he is in the danger area, and the crane side using the confirmation signal from the worker's alarm confirmation switch. However, an alarm system for crane work characterized by safety checks. 2. If the confirmation signal from the worker is not received in response to the alarm from the jib alarm transmitter, the control device prevents the crane's suspended load from lowering. Item 2. An alarm system for crane operation according to item 1.