JPH09258801A - Emergency shutdown system for plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize liaison between workers, the emergency stop of a plant and the individual stop/start of each machine by providing a transmitter-receiver provided with a wireless telephone function and the transmitter-receiver to transmit/receive an emergency stop signal. SOLUTION: When the emergency stop button of a second transmitter 20e is pushed, the emergency stop signal is transmitted by a radio wave. When a second receiver 20d receives this signal, it transmits an electric emergency stop signal to a control panel 20a. The control panel 20a emergency-stops the respective driving motors of a hopper 10a, a conveyor 10b and a crusher 10c at a time. Besides, by operating the dial buttons of a cordless telephone to constitute a first transmitter 10c by combining them properly, a desired machine can be stopped/started. If plural first transmitter-receivers 20c are prepared, and yard workers have them beforehand, the liaison can be established between the first receiver 20b as a host machine and each transmitter.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an emergency stop device for a plant.

[0002]

2. Description of the Related Art Plants often encounter situations in which they must be brought to an emergency stop. For example, in a crushing plant, a hopper receives rocks, and the rocks are appropriately taken out from a hopper by a feeder and supplied to a crusher or a mill as a crushing device by a belt conveyor to crush the rocks to a predetermined particle size. However, stones may be caught in the belt conveyor, or sand may cause the belt to idle and break. In such cases, it is necessary to stop the plant in an emergency. In other cases, it may be necessary to stop only a certain device.

On the other hand, a large number of workers perform their respective works at predetermined positions in the plant, but it is also necessary to promptly and appropriately communicate between these workers, and workers in a large premises must be used. Work efficiency declines when moving and contacting face-to-face.

[0004]

SUMMARY OF THE INVENTION The present invention has a technical problem to solve such a problem, and enables an emergency stop of a plant and individual stop and start of each device while enabling communication between workers. It is an object of the present invention to provide a plant emergency stop device that enables the above.

[0005]

According to the present invention, there is provided a control panel which is electrically connected to a drive unit of a component equipment of a plant and which controls start and stop of the equipment, and electrically connected to the control panel. A first receiving device having a wireless telephone function for generating an electric signal for starting and stopping the device; and a wireless telephone function cooperating with the first receiving device via radio waves. A first transmitting device provided, a second receiving device that is electrically connected to the control panel and generates an electric signal that causes an emergency stop of the device, and cooperates with the second receiving device via radio waves. The gist is an emergency stop device for a plant including a second transmission device.

[0006]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to FIG. In the following description, an embodiment of the present invention will be described by taking the case where the present invention is applied to a crushed stone plant for crushing rock as an example, but the present invention is applicable to other plants that require an emergency stop. Needless to say.

The crushing stone plant 10 is equipped with a hopper 10a having a feeder for receiving rocks to be crushed and appropriately supplying them. A conveyor 10b is arranged at the exit of the feeder of the hopper 10a, and the rocks supplied to the hopper 10a are taken out from the hopper 10a by a proper amount by the feeder and supplied to the conveyor 10b. The rock taken out from the hopper 10a is supplied to the crusher or mill 10c by the conveyor 10b, and crushed into a predetermined particle size by the crusher 10c. The crushed rocks are further transferred to another hopper or quarry by a conveyor (not shown) appropriately arranged downstream of the crusher 10c.

The emergency stop device 20 of the present invention is a control panel 20a.
Is provided. The control panel 20a includes, for example, a ROM and
It can be configured by a microcomputer including a RAM, a CPU, an input port, an output port, and a bidirectional bus interconnecting these ROM, RAM, CPU, input port, and output port. Control panel 2
0a is a drive motor (not shown) of the feeder device of the hopper 10a via the A / D converter, and the conveyor 10b.
Drive motor (not shown) and the drive motor (not shown) of the crusher 10c.

The emergency stop device 20 further comprises a wireless type telephone device function, for example, a first receiving device 20b which is a base unit of a cordless phone and a second receiving device which is appropriately arranged in the premises. A device 20d, a transmitter having a wireless telephone function, which cooperates with the first receiver 20b, for example, a first transmitter 20c that is a cordless phone slave unit, and the second receiver. Device 20
and a second transmitter 20e as a portable stop device cooperating with d. First and second receiving device 20
b and 20d are connected to the control panel 20a via an A / D converter by a cable or a wire. The first receiving device 20b and the first transmitting device 20c are wirelessly connected to each other and are configured to transmit and receive signals by radio waves. The second receiving device 20d and the second transmitting device 20e are also wirelessly connected to each other, and are configured to transmit and receive signals by radio waves.

When the emergency stop button of the second transmitter 20e is pressed, an emergency stop signal is transmitted by radio waves from the second transmitter 20e. When the second receiving device 20d receives this emergency stop signal, the second receiving device transmits an electrical emergency stop signal to the control panel 20a. When the control board 20a receives the electrical emergency stop signal from the second receiving device 20d, the control board 20a simultaneously stops the drive motor of the feeder of the hopper 10a, the drive motor of the conveyor 10b, and the drive motor of the crusher 10c. If there is another device that requires an emergency stop at the same time as these, it is possible to make an emergency stop at the same time by appropriately connecting to the control panel 20a.

When the crushed stone plant is stopped by using the first transmitting device 20c, the dial buttons provided in the cordless phone cordless handset constituting the first transmitting device 20c are appropriately combined and operated. Thus, it is possible to stop and start a desired device. For example,
By pressing the 11 dial button of the second transmitter 20c, the feeder of the hopper 10a is stopped, by pressing the 12 dial button, the conveyor 10b is stopped, and by pressing the 13 dial button, the crusher 10c is stopped. be able to. Further, by pressing the dial button 99, it is possible to stop all the devices in an emergency.

On the contrary, when the stopped device is to be restarted, for example, the dial button of 811 of the second transmitter 20c is pressed to activate the feeder of the hopper 10a, and the dial button of 812 is pressed. Thus, the conveyor 10b can be activated, and the crusher 10c can be activated by pressing the dial button 813. Further, it is possible to restart all the devices by pressing the dial button 899.

Further, since the second transmitting device 20c has the wireless type telephone device function as described above, a plurality of second transmitting devices 20c should be prepared and carried by the on-site worker. For example, the first receiving device 20b, which is the master device, and the respective transmitting devices can communicate with each other. For example, if the first receiving device 20b is installed in the central monitoring room in the plant, the central monitoring room can issue the same command to all workers at once, or can issue individual commands to each worker.

Although the embodiment of the present invention has been described by taking the crushed stone plant as an example, the present invention is not limited to the crushed stone plant, and may be applied to, for example, a cement manufacturing plant, a coal supply system in a power generation plant, an iron making plant, or the like. Applicable.

[0015]

Since the present invention is constructed as described above, it has the following effects. Since the first transmission device has a wireless telephone device function, it is possible to selectively stop and start the desired device and the entire plant by combining the dial buttons.

Further, since the first transmitting device has the function of the wireless type telephone device, the workers can appropriately make contact with each other as needed, so that a contact error can be prevented. . In particular, it is possible to instruct an appropriate treatment in case of an emergency and to perform a prompt treatment or operation through the first transmitting device based on this instruction. Therefore, it is possible to prevent an accident in advance or prevent the damage from spreading.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a preferred embodiment of the present invention.

[Explanation of symbols]

 10 ... Crushed plant 10a ... Hopper 10b ... Conveyor 10c ... Crusher 20 ... Emergency stop device 20a ... Control panel 20b ... 1st receiver 20c ... 1st transmitter 20d ... 2nd receiver 20e ... 2nd transmitter

Claims (1)

[Claims] 1. A control panel that is electrically connected to a drive unit of a component device of a plant and controls start and stop of the device; and a control panel that is electrically connected to the control panel to start and stop the device. A first receiving device having a wireless type telephone function for generating an electric signal for use, and a first transmitting device having a wireless type telephone function that cooperates with the first receiving device via radio waves. A second receiver that is electrically connected to the control panel and that generates an electrical signal that causes an emergency stop of the device; and a second transmitter that cooperates with the second receiver via radio waves. Emergency stop device for plant.