JP2000227982A - Safety device and equipment equipped with the device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To ensure the safety of workers in a facility area. SOLUTION: A danger detection means 3 for detecting a danger behavior of a worker in a facility area, a disaster prevention means 7 for performing a disaster prevention operation according to a detection signal of the danger detection means 3, and a disaster by the disaster prevention means 7 A safety device comprising a resetting device comprising a reset button switch 19 and the like for canceling the protection state, wherein the danger detecting device 3 transmits the disaster preventing device 7 when the working device disposed in the facility area is activated.
A release operation detecting means 8 for detecting that the release means has been operated after a control signal for operating the release means has been output, and at the time when the release operation detection means 8 detects that the release means has been operated, Operation permitting means 9 for permitting operation of the working device is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for ensuring the safety of workers in a facility area where various working devices such as a press machine or a shearing machine are installed, and to a facility equipped with the device. .

[0002]

2. Description of the Related Art Conventionally, as shown in, for example, Japanese Patent Application Laid-Open No. 7-301397, a light emitting element and a light receiving element are arranged to face each other via a predetermined dangerous area, and the light emitting element is projected from the light emitting element to the light receiving element. When the interruption of the light beam is detected based on the output of the light receiving element, in the self-check system of the light beam type safety device which generates an emergency stop signal of a required device, the drive signal is transmitted to the drive device of the press machine. An intermittent switch circuit, a microcomputer that outputs a pseudo signal to the light beam safety device, and inputs a light blocking signal from the light beam safety device, the light blocking signal, and the validity of the light beam safety device output from the microcomputer.・ Input any high level signal with the invalid switching signal, output the open / close signal to the switch circuit, and correct the check system to the microcomputer. Abnormal identification signal that is constituted by an RS flip-flop circuit for outputting is known.

[0003]

The self-check system of the above-mentioned light beam type safety device has an advantage that the operation of the whole system can be easily confirmed by a compact structure, but the pseudo output from the microcomputer is provided. Since the configuration is such that an abnormality of the light beam type safety device is artificially detected according to the signal, there has been a problem that the reliability of the detection result of the abnormality is insufficient. That is, even when it is detected that the beam-type safety device has an abnormality in response to the pseudo signal, whether the abnormality is caused by a failure of the beam-type safety device, or whether the abnormality is caused by the output of the pseudo-signal or the like. Since it is not possible to clearly determine whether the error was caused by a failure of the check system, even if it is detected that the above-mentioned abnormality has occurred, it is not a failure of the above-mentioned light beam type safety device, and the worker is free to do so. In some cases, the drive device of the press machine is operated upon making a determination, and it has been desired to prevent such a situation from occurring.

The present invention has been made in view of the above circumstances, and provides a safety device capable of ensuring the safety of workers in a facility area, and a facility including the device.

[0005]

The invention according to claim 1 is
Danger detection means for detecting a dangerous behavior of a worker in the equipment area, disaster prevention means for performing a disaster prevention operation according to a detection signal of the danger detection means, and release means for releasing a disaster prevention state by the disaster prevention means. A safety device comprising: a safety device that, when starting up a working device disposed in the facility area, outputs a control signal for activating a disaster prevention device from the danger detection device and operates the release device. A release operation detecting means for detecting, and an operation permitting means for permitting the operation of the working device when the release means is detected to be operated by the release operation detecting means.

[0006] According to the above configuration, at the time of activation of the working device disposed in the equipment area, the worker performs an operation of confirming whether or not the danger detecting means is operating properly. After the control signal for activating the disaster prevention means is output from the means, it is detected by the release operation detection means that the release means is operated and the operation of releasing the disaster prevention state by the disaster prevention means is performed. At this point, since the operation of the working device is permitted by the operation permitting means, it is possible to prevent the occurrence of a situation in which the working device is activated even though the danger detecting means is not operating properly. become.

According to a second aspect of the present invention, in the safety device according to the first aspect, the danger detecting means is an optical system comprising a light emitter and a light receiver for detecting that an operator has entered the equipment area. It is constituted by detecting means.

[0010] According to the above configuration, when starting up the working device disposed in the equipment area, there is a danger of detecting the optical system including the light emitter and the light receiver for detecting that an operator has entered the equipment area. The operation of the working device is kept in a prohibited state until it is detected that the operation of checking whether the detection means is operating properly is properly performed.

According to a third aspect of the present invention, in the safety device according to the first aspect, the danger detecting means includes a safety plug switch for detecting that an operator has entered the facility area. .

[0010] According to the above configuration, at the time of activation of the working device provided in the equipment area, whether the danger detecting means including the safety plug switch for detecting that an operator has entered the equipment area is operating properly. Until it is detected that the operation of confirming whether or not the operation has been properly performed, the operation of the operation device is held in a state in which the operation of the operation device is prohibited by the operation permission unit.

According to a fourth aspect of the present invention, there is provided the above-described first to fourth aspects.
The safety device according to any one of the above, further comprising an alarm unit for issuing an alarm when the disaster prevention unit performs a disaster prevention operation, and activating the alarm unit in response to a detection signal of the danger detection unit.

According to the above configuration, when the work device disposed in the equipment area is activated, when the operation for confirming whether or not the danger detection means is operating properly is performed, the alarm means is appropriately operated. It is confirmed at the same time whether an alarm is issued.

According to a fifth aspect of the present invention, in the safety device according to the fourth aspect, the working device uses a hydraulic cylinder as a drive source, the release means releases a stopped state of the working device, and an alarm. Constituted by a reset button switch having a function of stopping the operation of the means,
At the time of starting the working device, when the reset button switch is turned ON, a stop operation of the working device is released to allow the operation preparation operation to start supplying hydraulic pressure to the hydraulic cylinder, and the alarm is generated. The operation of the means is stopped.

According to the above configuration, at the time of starting the working device disposed in the equipment area, the supply of the starting hydraulic pressure to the hydraulic cylinder driving the working device is prohibited until the reset button switch is turned on. Only after the reset button switch is turned on, the working device is operated by turning on the operation preparation switch for starting the supply of the working oil pressure to the hydraulic cylinder, and the alarm device is operated. Will be stopped.

According to a sixth aspect of the present invention, there is provided a danger detecting means for detecting a danger behavior of a worker in a facility area, a disaster prevention means for performing a disaster prevention operation in accordance with a detection signal of the danger detection means, and a disaster prevention means. Releasing means for releasing the disaster prevention state by means, and the release means is operated after a control signal for activating the disaster prevention means is output from the danger detection means at the time of activation of the working device arranged in the equipment area. A safety device having a release operation detecting means for detecting that the release device has been operated, and an operation permitting means for permitting the operation of the working device when the operation of the release means is detected by the release operation detecting means. Things.

[0016] According to the above configuration, when starting the work equipment disposed in the equipment area, the worker performs an operation of confirming whether or not the danger detecting means is operating properly. After the control signal for operating the disaster prevention means is output from the means, when the release operation detecting means detects that the release means has been operated, the operation permitting means permits the operation of the working device. Therefore, it is possible to prevent a situation in which the operation device is operated even though the danger detecting means is not operating properly.

[0017]

FIG. 1 shows an embodiment of a facility provided with a safety device according to the present invention. The equipment includes a working device 1 such as a press machine driven by a hydraulic cylinder.
A fence 2 for partitioning the equipment area in which the working device 1 is disposed, a danger detecting means 3 for detecting a dangerous behavior of a worker in the equipment area partitioned by the fence 2, and the working device 1 And a control panel 4 for controlling the control panel 4. The control panel 4 includes a display means 5 comprising a grease lamp indicating that the danger detection means 3 is in an appropriate operating state, and a detection signal of the danger detection means 3. Alarm means 6 comprising a red lamp for issuing an alarm in response thereto is attached.

The danger detecting means 3 comprises an optical system detecting means constituted by a light emitting element such as a light emitting element for detecting that an operator has entered the equipment area and a light receiving element such as a light receiving element. It is configured to detect that the space between the light emitter and the light receiver is shielded by an operator or the like, and to output this detection signal to the control panel 4.

As shown in FIG. 2, the control panel 4 includes a disaster prevention means 7 for performing a disaster prevention operation in accordance with the detection signal of the danger detection means 3 and a disaster prevention means when the work apparatus 1 is started. 7, a release operation detecting means 8 for detecting whether or not an operation for releasing the disaster prevention operation has been performed, and the release operation detecting means 8 detects that the operation for releasing the disaster prevention operation has been performed. There is provided an operation permitting unit 9 that allows the working device 1 to operate, that is, supplies operating hydraulic pressure to the working device 1, and controls so as to prohibit the operation of the working device 1 until then.

The disaster prevention means 7 serves as a drive source of the work apparatus 1 when the danger detection means 3 detects that a worker has entered the facility area in the operating state of the work apparatus 1 or the like. The system is configured to perform a disaster prevention operation by disabling a hydraulic pump that supplies an operating hydraulic pressure to a hydraulic cylinder and outputting a control signal that activates the alarm unit 6 to generate an alarm.

The release operation detecting means 8 is activated when the working device 1 is started, that is, when a key switch 10 described later is turned on.
After the operation, the worker performs an operation of shutting off the light emitting device and the light receiving device of the danger detecting means 6 and outputs a control signal for activating the disaster prevention means 7. When it is detected that the release means consisting of is operated, the detection signal is outputted to the operation permitting means 9 and a control signal for turning on the display means 5 is outputted. .

The operation permitting means 9 includes a key switch 10
Is turned on to output the control signal to deactivate the hydraulic pump to the working device 1 via the disaster prevention means 7 from the start of the working device 1 in which the danger detecting means 3 is activated, and The operation of the working device 1 is permitted by stopping the output of the control signal for disabling the hydraulic pump in response to the detection signal of the release operation detecting means 8. As a result, after the release operation detecting means 8 confirms that the danger detecting means 3 is operating properly, the operation preparation operation for starting the supply of the operating hydraulic pressure to the hydraulic cylinder is permitted, and When the operation preparation switch provided on the panel 4 is turned on, the supply of the operating oil pressure to the hydraulic cylinder is started, and thereafter, the working device 1 can be operated.

The specific configuration and operation of the above safety device will be described with reference to a ladder chart shown in FIG. 3 and a time chart shown in FIG. At the time T1 when the key switch 10 is turned ON when the working device 1 is started, the light emitting device 11 constituting the danger detecting means 3
2, the light is received by the light receiver 12, and the coil 13 of the relay X1 is energized to turn on the contact 14 of the relay X1 and turn off the contact 15 of the relay X1. Becomes As a result, the coil 25 of the relay X2 is energized, and the contact 16 of the relay X2 is turned on.
At this time T1, a control signal (light reception confirmation signal) indicating that the danger detection means 3 has received light normally is output to the release operation detection means 8 at time T1.

Then, the operator inserts a hand or an appropriate tool between the light emitter 11 and the light receiver 12, for example.
At the time T2 when the operation of temporarily interrupting the connection between the light emitter 11 and the light receiver 12 is performed, the coil 1 of the relay X1 is turned off.
3 is stopped, the contact 14 is turned off, and the contact 15 is turned on. As a result, the coil 17 of the relay X3 is energized and
At this time T2, a control signal (light-shielding confirmation signal) indicating that the danger detection means 3 is operating properly is output to the release operation detection means 8 and the display at the time T2. The green lamp constituting the means 5 is turned on. Further, at time T2 when the light-shielding operation is performed, the contact 18 of the relay X3 is turned on, so that the red lamp constituting the alarm means 6 is simultaneously turned on.

Further, when a control signal indicating that the danger detecting means 3 is operating properly is output to the releasing operation detecting means 8, the reset button switch 19 for stopping the operation of the alarm means 6 is set. An ON operation can be performed. As a result, the reset button switch 1
At the time T3 when the switch 9 is turned on, the coil 2 of the relay X4 is turned on.
Since the contact 21 of the relay X4 is turned on and the contact 22 of the relay X4 is turned off, the power supply to the alarm means 6 is stopped and the red lamp is turned off.

Further, the reset button switch 19
Is turned on, a control signal that allows the operation preparation switch for starting the supply of the operating oil pressure to the hydraulic cylinder of the working device 1 to be turned on is transmitted from the release operation detecting means 8 to the operation permission. By outputting to the disaster prevention means 7 via the means 9, the operation prohibition state of the working device 1 is released.

Thereafter, as shown in FIG. 4, at time T4 when the operation preparation switch is turned ON, the hydraulic pump is activated, and the operation of the working device 1 is permitted. Further, in the operating state of the working device 1, when the danger detecting means 3 detects that a worker has entered the equipment area, that is, the light receiving device 12
When the power supply to the coil 13 of the relay X1 is stopped at the time T5 when the output of the light receiving signal is stopped, the contact 14 of the relay X1 is turned off, and the power supply to the coil 20 of the relay X4 is stopped. Is done.

As a result, the contact 22 of the relay X4 provided on the power supply line for the alarm means 6 is turned on, and the alarm means 6 comprising the red lamp is turned on. At the same time, the output of the control signal allowing the ON operation of the operation preparation switch is stopped, and this state is determined by the reset button switch 19 being turned off.
It is held until time T6 when N operations are performed. Further, at the time T5, the operation state of the hydraulic pump is stopped, and
This state is maintained until time T7 when the operation preparation switch is turned on.

As described above, the danger detecting means 3 for detecting the danger behavior of the worker in the equipment area, the disaster preventing means 7 for performing a disaster preventing operation according to the detection signal of the danger detecting means 3, and the disaster preventing means A safety device including a reset button switch 19 and the like for releasing the disaster prevention state by the safety device 7 from the danger detection device 3 to the disaster prevention device 7 when the working device 1 disposed in the facility area is activated. A release operation detecting means 8 for detecting that the release means has been operated after a control signal for operating the release means has been output, and at the time when the release operation detection means 8 detects that the release means has been operated, Since the operation permitting means 9 for permitting the operation of the working device is provided, the danger detecting means 3 for detecting the danger behavior of the worker in the facility area operates properly. Despite not, the occurrence of a situation that the operation of the working device 1 is performed can be prevented.

That is, when the working device 1 is started, the worker performs an operation of shutting off the light emitting device and the light receiving device of the danger detecting means 6 and outputs a control signal for activating the disaster prevention means 7. After that, when the release operation detecting means 8 detects that the release means including the reset button switch 19 has been operated, the danger detecting means 3
Until it is confirmed that the hydraulic pump is operating properly, the operation permitting means 9 keeps the hydraulic pump supplying the hydraulic oil to the hydraulic cylinder of the working device 1 in a non-operating state.
Before the danger detecting means 3 is determined to be operating properly, the supply of the operating oil pressure can be started even if the operation preparation switch for starting the supply of the operating oil pressure to the hydraulic cylinder is turned ON. No, this will ensure work safety.

In the above embodiment, the light projector 11 and the light receiver 12 detect that an operator has entered the equipment area.
Although the example in which the danger detection means 3 is constituted by the detection means of the optical system described above has been described, the danger detection means is not limited thereto, and may be a safety plug switch, a door switch, a mat switch, or the like provided on the fence 2. By
It may be configured to detect a dangerous behavior of a worker in the equipment area.

In the above embodiment, the disaster prevention means 7
Alarm means 6 for issuing an alarm at the time of a disaster prevention operation according to the present invention, and the alarm means 6 is configured to be activated.
When the work apparatus 1 arranged in the equipment area is activated, when the release operation detecting means 8 detects whether or not the danger detecting means 3 is operating properly, the alarm means 6 appropriately issues an alarm. Can be detected at the same time.
That is, at the time when the working device 1 is started, when the worker performs an operation of temporarily shutting off between the light emitter 11 and the light receiver 12 of the danger detecting means 3, the alarm means 6 is activated.
Because it is configured to output a control signal to turn on
There is an advantage that the presence or absence of the failure can be detected according to the lighting state of the alarm means 6. Instead of the above-mentioned red lamp, or together with this red lamp, a structure may be provided in which a warning means such as a buzzer which emits a predetermined warning sound is provided.

Further, in the above-described embodiment, the facility provided with the working device 1 driven by the hydraulic cylinder has the function of releasing the stopped state of the working device 1 and the function of stopping the operation of the alarm means 6. Reset button switch 19
When the reset button switch 19 is turned on when the working device 1 is started, the stopped state of the working device 1 is released and the supply of the working oil pressure to the hydraulic cylinder is started. And the operation of the warning means 6 is stopped, and the operation of the working device 1 is performed despite the presence of a worker in the facility area. Can be effectively prevented.

For example, when the work apparatus 1 is stopped and a worker who inspects the work apparatus 1 is in the work area, the work apparatus 1 is turned on until the reset button switch 19 is turned on. The alarm means 6 is maintained in the operating state. Then, in order for another worker who does not know the presence of the worker to operate the work apparatus 1, the reset button switch 19 must be turned ON. The transition from the operating state to the non-operating state will be made. Therefore,
Since the worker can detect the above-mentioned situation according to the state of the alarm means 6, the operation preparation operation for starting the supply of the working oil pressure to the hydraulic cylinder is completed and before the work apparatus 1 starts operating, It is possible to secure time for the worker to retreat to a safe position.

[0035]

As described above, the present invention provides a danger detecting means for detecting a dangerous behavior of an operator in a facility area, and a disaster preventing means for performing a disaster prevention operation in accordance with a detection signal of the danger detecting means. Release means for releasing the disaster prevention state by the disaster prevention means, and the above-mentioned release after the control signal for activating the disaster prevention means is output from the danger detection means at the time of activation of the working device arranged in the facility area. Release operation detecting means for detecting that the means has been operated;
An operation permitting means for permitting the operation of the working device when the release means is operated by the release operation detecting means, so that the danger detection for detecting a dangerous behavior of a worker in the equipment area is provided. There is an advantage that a situation in which the working device is operated even though the means is not operating properly can be prevented, and work safety can be ensured.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a specific example of equipment provided with a safety device according to the present invention.

FIG. 2 is a block diagram showing an embodiment of a safety device according to the present invention.

FIG. 3 is a ladder chart showing a specific configuration of the safety device.

FIG. 4 is a time chart showing an operation state of the safety device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 work equipment 3 danger detection means 6 alarm means 7 disaster prevention means 8 release operation detection means 9 operation permission means 11 light emitter 12 light receiver 19 reset button switch

Claims (6)

[Claims] 1. A danger detecting means for detecting a dangerous behavior of a worker in a facility area, a disaster preventing means for performing a disaster preventing operation in accordance with a detection signal of the danger detecting means, and a disaster preventing state by the disaster preventing means. A safety device comprising: a release device for releasing the safety device, wherein the release device outputs a control signal for activating the disaster prevention device from the danger detection device when the working device disposed in the facility area is activated. Release operation detecting means for detecting that the operation has been performed, and operation permission means for permitting operation of the working device at the time when the operation of the release means is detected by the release operation detection means. And safety equipment. 2. A safety device according to claim 1, wherein said danger detecting means is constituted by an optical system detecting means comprising a light emitter and a light receiver for detecting that an operator has entered the facility area. A safety device characterized by the following. 3. A safety device according to claim 1, wherein said danger detecting means is constituted by a safety plug switch for detecting that an operator has entered the facility area. 4. The safety device according to claim 1, further comprising alarm means for issuing an alarm when a disaster prevention operation is performed by the disaster prevention means, wherein the alarm is issued in response to a detection signal of the danger detection means. A safety device characterized in that it is configured to activate the means. 5. The safety device according to claim 4, wherein the working device uses a hydraulic cylinder as a drive source, and the releasing means releases a stop state of the working device and a function of stopping the operation of the alarm device. And a reset button switch with
When the reset button switch is turned ON,
A safety device configured to release a stop state of the working device and to allow an operation preparation operation for starting supply of operating hydraulic pressure to the hydraulic cylinder, and to stop operation of the alarm unit. 6. A danger detecting means for detecting a danger behavior of a worker in a facility area, a disaster prevention means for performing a disaster prevention operation according to a detection signal of the danger detection means, and a disaster prevention state by the disaster prevention means. Release means for releasing, and a release for detecting that the release means has been operated after a control signal for activating the disaster prevention means has been output from the danger detection means when the working device arranged in the facility area is started up. A facility comprising a safety device having an operation detecting means and an operation permitting means for permitting the operation of the working device when the operation of the releasing means is detected by the releasing operation detecting means. .