JP2012197906A - Safety shutdown system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety shutdown system that can arbitrarily shut down a machine that operates by receiving energy supplied from an energy source, can improve capability of coping with a contingency, and can improve the safety of work.SOLUTION: A safety shutdown system 1 is formed by a terminal 10 configured to transmit a first signal S1 by the operation of a worker, a receiver 24 configured to receive the first signal S1 from the terminal 10 and to transmit a second signal S2, and a controller 30 configured to receive the second signal S2 from the receiver 24 and to shut off transmission of power supplied to a work machine 52 from a power source 54.

Description

  The present invention relates to a safety stop device that arbitrarily stops a machine that operates by receiving supply of energy from an energy source.

Various work is done every day. Various work machines have been developed to reduce the labor of workers and improve work efficiency. Such work machines often have movable parts that generate very large forces.
An example of such a working machine is an excavation work vehicle that peels off the surface layer of a paved road (see Patent Document 1). This excavation work vehicle has rotating excavation discharge means as a movable part. This rotary excavation discharge means discharges crushed materials generated by excavation while forming excavation grooves on the road surface of the paved road.

JP-A-9-324404

Since the force generated by the rotary excavation discharge means of the excavation work vehicle described above is very large, workers and the like keep a sufficient distance from the rotary excavation discharge means for safety. And in case of an unexpected situation, the excavation work vehicle is equipped with an emergency stop device for rotating excavation discharge means.
However, the possibility that the emergency stop device does not operate due to various accidental accumulations cannot be completely denied.
The present invention solves the above-mentioned problems, and the object of the present invention is to arbitrarily stop a machine that operates by receiving energy supply from an energy source, improving the ability to cope with unexpected situations. And providing a safety stop device that improves work safety.

  The present invention adopts the following configuration in order to solve the problem. A safety stop device according to a first aspect of the present invention is a safety stop device that arbitrarily stops a machine that operates by receiving energy supply from an energy source, and transmits a first signal by an operation of an operator. Receiving the first signal transmitted by the terminal and transmitting a second signal; and receiving the second signal transmitted by the receiver directly or indirectly to receive the second signal; A controller for interrupting transmission of energy supplied by the energy source to the machine.

When the worker immediately stops the operating machine, the worker sends a first signal to the receiver by operating the terminal. When the receiver receives the first signal, it transmits a second signal to the controller. When the controller receives the second signal, it interrupts transmission of energy supplied by the energy source to the machine. As a result, the operating machine stops.
Examples of the energy transmission medium supplied from the energy source to the machine include electricity, compressed air, fluid such as hydraulic oil and water, light, sound, heat, and the like. In addition, when the machine uses a physical force supplied from the outside as an energy source, a structure that transmits the physical force is an energy transmission medium.

For example, a terminal can be carried by a plurality of workers. As long as it is a worker carrying the terminal, anyone who feels necessary can immediately shut down the operating machine.
The first signal transmitted from the terminal may be a signal transmitted to the receiver wirelessly, or may be a signal transmitted to the receiver by wire. From the viewpoint of the degree of freedom of action of the worker carrying the terminal device, the first signal transmitted by the terminal device is more preferably a signal transmitted wirelessly to the receiver.

For example, when the machine stopped by the safety stop device is operated by electricity, a switch that cuts off the current supplied from the power source can be used as the controller.
When the machine stopped by the safety stop device operates using light, heat, or sound as an energy source, the controller may cut off the light, heat, or sound input path or transmission path.
When the machine stopped by the safety stop device drives with compressed air or hydraulic oil as an energy source, a valve that shuts off the flow path of the compressed air or hydraulic oil can be used as the controller. In this case, it is preferable that the installation position of the valve is closer if it is close to the machine that is stopped by the safety stop device. This is because the amount of compressed air and hydraulic oil flowing to the machine after the valve is activated can be reduced, and the time from when the valve is activated until the machine is stopped can be further shortened. is there.

When the machine stopped by the safety stop device operates using physical force such as rotational force supplied from the outside as an energy source, the controller may forcibly cut off the transmission of the physical force from the outside. . For example, if the controller is a clutch, the second signal may be disengaged.
It should be noted that the receiver and the controller may be configured integrally or may be configured separately.

A safety stop device according to a second aspect of the present invention is the safety stop device according to the first aspect, wherein the first signal transmitted from the terminal is the receiver that receives the first signal. The receiver transmits the second signal only when the first signal includes the identification information.
The identification information stored in the storage unit by the terminal device identifies the receiver that should receive the first signal transmitted by the terminal device. Due to the identification information contained in the first signal, the receiver reacts only to the first signal transmitted by a specific terminal. Thereby, even if it is a case where a some machine is operating, the worker can stop only the target machine exactly.

A safety stop device according to a third aspect of the present invention is the safety stop device according to the second aspect, wherein the terminal has a storage unit for storing the identification information in a rewritable manner.
By rewriting the identification information stored in the storage unit, the same terminal can be associated with an arbitrary receiver. As a result, even if the number of machines stopped by the safety stop device increases, the number of terminals can be prevented from increasing, and the management of terminals can be facilitated.

  A safety stop device according to a fourth aspect of the present invention is the safety stop device according to any one of the first to third aspects, wherein the machine is powered by energy supplied from the energy source. A movable part that operates, and a brake that stops the operation of the movable part, and the controller receives the second signal transmitted by the receiver directly or indirectly to receive the brake. Operate.

When the machine stopped by the safety stop device has a movable part that operates by the energy supplied from the energy source, even if the transmission of the energy supplied from the energy source is interrupted, the movable part will continue its operation by inertia. And Even in such a case, when the worker operates the terminal, the controller activates the brake and the operation of the movable portion stops.
Note that the operation of the movable portion is a physical motion operation such as a rotation operation, a forward operation, a reverse operation, a striking operation, or a vibration operation.

  Since it is a safety stop device as described above, it is possible to arbitrarily stop a machine that operates by receiving energy supply from an energy source, improve the ability to cope with unexpected situations, and work safety Can be improved.

It is a block diagram of a safety stop device.

A safety stop device according to the present invention will be described with reference to FIG.
The safety stop device 1 includes a terminal device 10, a receiver 24, and a controller 30.
The work vehicle 50 is equipped with a power source 54 as an energy source and a work machine 52 that drives electricity as energy. The work machine 52 includes a rotation mechanism 58 that rotates using electricity as energy, and a brake 60 that stops the rotation of the rotation mechanism 58. The rotation mechanism 58 forms a movable part of the work machine 52.

The terminal device 10 is an independent entity, and is configured so that a worker can always carry the terminal device 10. The terminal device 10 has a hanging string (not shown) for an operator to hang the terminal device 10 from the neck.
The terminal device 10 includes a main switch 12, a storage unit 14, a signal transmission unit 16, and a release switch 18.
The main switch 12 is configured to be switchable between an ON state and an OFF state. And the main switch 12 has the structure which transmits signal S3 which shows that the main switch 12 was set to the ON state to the signal transmission part 16. FIG.

The storage unit 14 stores identification information D. The identification information D is information given corresponding to the receiver 24. The storage unit 14 is configured to be able to rewrite the stored identification information D.
The signal transmission unit 16 has a configuration that wirelessly transmits the first signal S1 to the receiver 24 when the signal S3 from the main switch 12 is received. The first signal S1 includes identification information D that the signal transmission unit 16 reads from the storage unit 14.
The release switch 18 has a configuration for returning the main switch 12 in the ON state to the OFF state, and returns the main switch 12 to the OFF state only when the operator manually operates the release switch 18. It has a configuration.

The receiver 24 and the controller 30 are installed in the work vehicle 50.
The receiver 24 is configured to receive the first signal S <b> 1 from the signal transmission unit 16. The receiver 24 has a configuration for transmitting the second signal S2 to the controller 30 only when the identification information D included in the first signal S1 corresponds to the receiver 24. .
The controller 30 is installed on a line 56 that connects the power source 54 and the work machine 52. The controller 30 has a configuration in which only when the second signal S2 is received from the receiver 24, the line 56 is cut off and the power supplied from the power source 54 to the work machine 52 is cut off.

The controller 30 is connected to the brake 60 and has a configuration for transmitting an operation signal S4 for operating the brake 60 only when the second signal S2 is received from the receiver 24. The brake 60 is configured to operate upon receiving the operation signal S4 and stop the rotation of the rotation mechanism 58.
The controller 30 has a manual return switch 32. The return switch 32 has a configuration in which the line 56 disconnected by the controller 30 is reconnected only when the operator manually operates the return switch 32. The return switch 32 also has a configuration that releases the operation of the brake 60 only when the operator manually operates the return switch 32.

The safety stop device 1 has the above-described configuration. Next, the effect which the safe stop apparatus 1 show | plays is demonstrated.
Three workers A, B, and C perform work using the work machine 52.
Each of workers A, B, and C carries one terminal device 10 and hangs the terminal device 10 from the neck. During the work, the worker A operates the work vehicle 50, the worker B operates the work machine 52, and the worker C watches the entire work from a slightly separated position.

Assume that during the work, for example, a part of the clothes of the worker B is likely to be caught in the rotating rotating mechanism 58. In this case, one of the workers A, B, and C who notices the occurrence of the situation immediately operates the main switch 12 of the terminal device 10 carried by him and turns the main switch 12 on. .
When the main switch 12 is turned on, the main switch 12 transmits the signal S3 to the signal transmission unit 16. When the signal transmission unit 16 receives the signal S3 from the main switch 12, the signal transmission unit 16 wirelessly transmits the first signal S1 to the receiver 24. The first signal S <b> 1 includes the identification information D read from the storage unit 14 by the signal transmission unit 16.

The receiver 24 receives the first signal S1 from the signal transmission unit 16. Since the first signal S 1 includes the identification information D corresponding to the receiver 24, the receiver 24 transmits the second signal S 2 to the controller 30.
When receiving the second signal S <b> 2 from the receiver 24, the controller 30 cuts off the line 56 and cuts off the electric power supplied to the work machine 52. The work machine 52 stops when the power is cut off. At the same time, the controller 30 transmits an operation signal S4 to the brake 60. The brake 60 operates by receiving the operation signal S4, and the rotation of the rotation mechanism 58 stops.

The work machine 52 is stopped, and the rotation of the rotation mechanism 58 is also stopped, so that the worker B can obtain nothing.
The worker C confirms the safety of the worker B. Next, among the workers A, B, and C, the person who operates the main switch 12 of the terminal device 10 operates the release switch 18 of his / her terminal device 10 to turn the main switch 12 that has been turned on to the OFF state. Return.
Then, the worker B operates the return switch 32 of the controller 30 to reconnect the line 56 disconnected by the controller 30, release the operation of the brake 60, and resume the work.

  If any one of the workers A, B, and C operates the main switch 12 of the terminal device 10 to turn it on, the work machine 52 stops and the rotation of the rotation mechanism 58 stops. The work machine 52 does not start to move again unless the release switch 18 is operated to return the main switch 12 to the OFF state and the return switch 32 is operated to disconnect the line 56 that has been disconnected. Further, unless the return switch 32 is operated to release the operation of the brake 60, the rotation mechanism 58 does not start rotating again.

  Even when a plurality of work machines 52 are used, the terminal 10 and the terminal 10 are operated by changing the identification information D corresponding to the receiver 24 of each work machine 52. The work machine 52 to be stopped can be associated. Therefore, the terminal device 10 is prevented from stopping the work machine 52 that does not need to be stopped.

If the identification information D stored in the storage unit 14 of the terminal device 10 is rewritten, two of the same terminal devices 10 can be used in different work machines. An increase in the number of terminal devices 10 can be prevented, and management of the terminal devices 10 is facilitated.
In addition, although the terminal device 10 has a hanging strap for an operator to hang the terminal device 10 from the neck, the terminal device 10 has a clip for the operator to hold the terminal device 10 on clothes. You may do it.

  Since the safety stop device is as described above, the machine can be stopped immediately when necessary, which is useful for ensuring the safety of work more reliably.

DESCRIPTION OF SYMBOLS 1 Safety stop apparatus 10 Terminal 12 Main switch 14 Memory | storage part 16 Signal transmission part 18 Release switch 24 Receiver 30 Controller 32 Return switch 50 Work vehicle 52 Work machine 54 Power supply of work machine 56 Power supply and work of work machine 58 Rotating mechanism 60 Brake S3 First signal S2 Second signal S3 Signal indicating that the main switch is turned on S4 Brake operation signal D Identification information stored in the storage unit

Claims (4)

A safety stop device that arbitrarily stops a machine that operates by receiving energy supply from an energy source,
A terminal that transmits the first signal by the operation of the worker;
A receiver that receives the first signal transmitted by the terminal and transmits a second signal;
A safety stop device comprising: a controller that directly or indirectly receives the second signal transmitted by the receiver and interrupts transmission of energy supplied from the energy source to the machine. . The first signal transmitted from the terminal includes identification information given corresponding to the receiver that receives the first signal;
The safety stop device according to claim 1, wherein the receiver transmits the second signal only when the first signal includes the identification information.   The safety stop device according to claim 2, wherein the terminal includes a storage unit that stores the identification information in a rewritable manner. The machine has a movable part that operates by energy supplied from the energy source, and a brake that stops the operation of the movable part,
The said controller receives the said 2nd signal which the said receiver transmits directly or indirectly, and operates the said brake, The claim in any one of Claims 1-3 characterized by the above-mentioned. The safety stop device according to the paragraph.

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