JPS58146795A - Safety work system in machine shop - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention is capable of issuing an alarm and automatically and forcibly causing the machine to operate when a person enters a dangerous area around the machine, such as the operating area of an automated machine or a workpiece in a machine shop. This relates to a safe work system in a machine shop that takes safety measures such as stopping machines at certain times to prevent accidents resulting in injury or death.

Generally, in a machine shop, multiple automated machines are surrounded by fences, etc., and people are warned not to trespass inside the railings, which are considered dangerous areas.

However, if, for example, one machine in the column breaks down, a worker who enters the column to repair it may inadvertently cause another machine to start operating, resulting in an accident resulting in injury or death. - For example, due to a mechanical failure, a worker operates an out-of-control control panel to stop all machines in the field, and then a third party enters the field and investigates the cause of the machine's failure. If a person carelessly operates the control panel, the machine inside the rail may start operating, and the moving parts of the machine may hit the worker inside the rail, causing an accident. For this reason, when a worker enters the field, the machine inside the field is automatically and forcibly stopped, etc.
Safety measures must be taken.

Therefore, the present invention was made in view of the above, and has functions such as wirelessly detecting when a worker enters a dangerous area within a shelf, and stopping the machine within the shelf upon detection. By activating the safety device, when a worker enters the shelf, safety measures such as automatically and forcibly stopping the machine inside the shelf can be taken to prevent unintentional operation of the machine. The purpose is to prevent accidents resulting in injury or death.

Therefore, the present invention has a receiving antenna whose reception range is a dangerous area around machines in a machine shop and which receives radio waves emitted from an oscillator carried by a worker, and a receiving antenna that is connected to the receiving antenna and which transmits the received waves. It is equipped with a receiving circuit that determines whether or not the radio waves are from the oscillator, and a safety device whose operation is controlled by the output signal of the receiving circuit, and the safety device is activated when a worker enters a dangerous area in the factory. It is something.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

Figure 1 shows the inside of the machine shop, 1,1. ... are automated machines, and the machines 1, 1 . ... is surrounded by a fence 2 that is as high as a person's waist, and inside the fence 2 are machines 1, 1, . ...The surrounding area has been designated as Dangerous Area D. Outside the fence 2 are the machines 1, 1.・・・
A control panel S for automatically controlling the fence 2 is provided, and a worker M operates the control panel 5 outside the fence 2 to control the fence 2.
Machines inside 1.1. It is configured to automatically control...

A loop-shaped receiving antenna 4 is provided on the upper part of the fence 2. As shown in enlarged detail in FIG. 2, each of the receiving antennas 4 is disposed inside a shield body 5 consisting of a hollow hemisphere with an open portion facing the dangerous area D, and is attached to the upper end of the fence 2. ing. As a result, each receiving antenna 4 has a corresponding shield body 5.
Directivity is given in the direction of the dangerous area D, and the receiving range is within the range shown by the dashed line in FIG. 1 of the dangerous area D. Therefore, if worker M enters dangerous area D for any reason,
When the worker M enters a range, the receiving antenna 4, which has that range as its reception range, receives radio waves from the geophone 6 of the worker M for the first time. The receiving antenna 4 is connected to a receiving circuit 7, as shown in FIG.

The receiving circuit 7 calculates the number of cycles of the received wave received by the receiving antenna 4 within a predetermined time and compares it with a predetermined number of cycles stored in advance. 6, and includes a receiving section 8 that receives the radio waves and a band filter 9 that filters the output of the receiving section 8.
, a level comparator 10 that compares the output of the bandpass filter 9 with a predetermined level, a pulse generator 11 that generates a predetermined pulse from the T1 to T3 terminals, and the level comparator 1
0 and an AND gate 12 receiving the output of the pulse generator 11
, a counter 15 which receives the output of the AND gate 12 at its T terminal and the output from the T2 terminal of the pulse generator 11 at its R terminal, a ROM 14 in which a predetermined number of cycles is stored, and a Q of the counter 15. A comparator 15 that compares the output from the terminal with the output of the ROM 14, a latch 16 that receives the output of the controller 15 at the D terminal, the pulse generator 110T, and the T terminal that receives the output from the terminal. We are prepared. The pulse generator 11 generates a pulse with a pulse width t shown in FIG. The pulse shown in the same figure (b) is generated from the T3 terminal, and then when the nozzle generation of the T3 terminal is finished, the pulse shown in the same figure (c) is generated from the T2 terminal, and then the pulse width is generated from the T terminal again. generates a pulse of t repeatedly. Further, the ROM 14 stores in advance the number of cycles f of the radio waves of the oscillator 6 carried by the worker M within the range of time t. Furthermore, the latch 16 is
Only when the number of cycles of the received wave within time t and the number of cycles f stored in advance in the ROM 14 match as compared with each other by the comparator 15, the Q output is set to H level and an output signal is generated. is input to the safety device 17.

The safety device 17 is installed on the machines 1, 1 . Open the switch 18 prepared for ... and turn on the machine 1.1. ... and a warning section 21 having a warning buzzer, a warning lamp, etc., and simultaneously open the switch 18 by the circuit breaker 20 upon receiving the output signal from the latch 16. The operation is controlled to sound an alarm buzzer or flash an alarm lamp.

Next, the operation of the above embodiment will be explained. For example, when the machine 1 inside the fence 2 breaks down for some reason, the worker M operates the control panel 3 to control the machine 1.1 inside the fence 2. ..., then enters fence 2 and attempts to investigate the cause of machine 1's failure.

Then, radio waves from the oscillator 6 carried by the worker M are received by the receiving antenna 4 whose reception range is around the failed machine 1. This received wave is outputted from the receiving section 8 of the receiving circuit 7 as a waveform as shown in FIG. Ru. As a result, the output waveform of the level comparator 10 becomes a pulse waveform as shown in FIG. Thereafter, when a pulse for t seconds as shown in FIG. positive pulses pass through the AND gate 12 and are output to the color/receiver 15. In this counter 16, n
The comparator 15 compares these n positive pulses with the number of cycles f stored in the ROM 14- in advance, and when it is confirmed that they match, the Q output of the comparator 15 becomes H level. Then, the Q output of the latch 16 becomes H level. As a result, the H of the latch 16
The output signal activates the safety device 17, and the switch 18 is opened in the circuit breaker 20, and the machines 1, 1, . ... is forcibly stopped, and at the same time the alarm buzzer sounds and the alarm lamp flashes.

Therefore, when the worker M enters the dangerous area D inside the fence 2, the machines 1, 1, . ...immediately closes switch 1
8 will automatically and forcibly stop operating, so even if a factory manager or the like who happens to be on patrol accidentally operates the control panel S, the machines 1, 1, . ... will never start operating. Moreover, it is possible to recognize that the worker M has entered the dangerous area D by the sound of the alarm buzzer and the blinking of the alarm lamp. Therefore, as before, the machine 1.1. ... can be prevented from occurring due to the careless operation of the fence 2. Moreover, the method for detecting that the worker M has entered the dangerous area D inside the fence 2 is based on the outer periphery of the fence 2. Since it is a wireless system consisting of a receiving antenna 4 provided and an oscillator 6 carried by the worker M, no expensive equipment is required and the cost of equipment for a safe work system can be kept low.

In the above embodiment, the receiving antenna 4 was installed at an appropriate location on the fence 2 to cover the dangerous area D around the machines in the machine shop. , it may be installed at an appropriate location within the machine shop so that the dangerous area D is within the receiving range. but,
The above embodiment is advantageous in that it can be easily installed using the existing fence 2.

As explained above, according to the present invention, a receiving antenna whose reception range is a dangerous area around machines in a machine shop is provided, and when a worker enters the dangerous area, the receiving antenna allows the worker to carry By receiving the radio waves emitted from the oscillator in the factory and activating the safety device, it is possible to automatically and forcibly stop the operation of the machinery in the factory while the worker is in the dangerous area. Since it is possible to issue an alarm or the like, it is possible to prevent personal accidents caused by careless operation of the machine, thereby improving safety.

Furthermore, since the system for detecting that a worker has entered a dangerous area is a wireless system that combines a receiving antenna and an oscillator carried by the worker, it can be implemented at low equipment cost.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a diagram showing the inside of a machine shop, FIG. 2 is an enlarged vertical side view showing the mounting state of the receiving antenna, and FIG. 3 is an electric circuit diagram showing the overall schematic configuration. FIG. 4 is a diagram of output waveforms from each terminal of the pulse generator, and FIG. 5 is a diagram of output waveforms of the main parts of the receiving circuit. 1.1. ...Machine, 2..Fence, D..Dangerous area,
M... worker, 4... receiving antenna, 5... shield body, 6... oscillator, 7... receiving circuit, 8... receiving section, 9...
・Band filter, 10...Level comparator, 11...Pulse generator, 12...AND gate, 15...Counter,
14... ROM, 15... comparator, 16... latch, 17... safety device, 20... circuit breaker, 21... warning section.

Claims (1)

[Claims] fl) A receiving antenna whose reception range is a dangerous area around machines in a machine shop and which receives radio waves emitted from an oscillator carried by a worker, and a receiving antenna connected to the receiving antenna. , is equipped with a receiving circuit that determines whether the received wave is a radio wave from the oscillator or not, and a safety device that is activated and controlled by the output signal of the receiving circuit, and when a worker enters a dangerous area in the factory, the safety device is activated. A safe work system in a machine shop characterized by being activated. (2) In a machine factory as described in claim (1), the receiving antenna is provided on a fence surrounding the machine via a shield body for providing directivity in the direction of a dangerous area. Safety work system.