JPH0637054Y2 - On-site protection device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is designed for use in a dangerous area when entering within a certain range due to the turning motion of a robot or an excavator, or around a manhole under construction. The present invention relates to an on-site protection device that suspends both ends of a flexible tube and gives an alarm when a person comes into contact with the flexible tube to change its flexible state.

[Conventional technology]

Conventionally, in such a dangerous area, it is dangerous to install a protective fence or hook both ends of a rope or flexible tube on a pillar standing on the ground or floor and indicate that it is dangerous. Was.

In recent years, in order to ensure the safety of work, an observer has been set up outside the dangerous area to give attention to entering or peeping inside.

[Problems to be solved by the device]

Thus, keeping a watchman near the dangerous area at all times increases the work cost in the present day when labor costs are soaring.

In addition, for the robots installed in the factory, the same protective fence and flexible tube as above are installed in the work area, but since there are no supervisors, the protective fence can be collapsed, Bending of the flexible tube can cause visitors and other workers to enter the work area and become dangerous.

[Purpose of device]

The present invention, when a passerby, a visitor, or another worker comes into contact with a flexible tube indicating a hazardous area without a guard,
By using the change in the bending state of the flexible tube, the purpose is to alert the passers-by, visitors, and other workers with a buzzer to avoid the danger.

[Means for Solving the Problems]

The present invention relates to a means of an entrance protection device for achieving the above-mentioned object, between a pair of spring conductive bands,
An insulating spacer is interposed at a fixed distance to hold two elastic conductive bands in parallel with each other, and a sensor whose outer surface is covered with an insulating coating is built in a flexible tube, and both ends of the flexible tube are integrated. The object is achieved by attaching a hooking metal to the sensor and connecting the lead wire connected to the spring-like conductive band of the sensor to an alarm device for issuing an alarm by the contact of the spring-like conductive band.

[Example of device]

 Next, an example of implementation of the present invention will be described with reference to the drawings.

FIG. 1 is a circuit diagram thereof, 1 is an alarm device, and 2 is a sensor having a pair of two elastic conductive bands 2a and 2b for detecting a change in the bending state of a flexible tube.

As shown in FIGS. 2 and 3, this sensor 2 has insulating spacers 3 interposed at regular intervals between the elastic conductive bands 2a and 2b, and an outer periphery thereof is covered with a synthetic resin film 4. It is covered.

Therefore, when the sensor 2 is in a predetermined curved state, the two elastic conductive bands 2a and 2b do not contact each other, but as shown in FIG. 4, when the curved state of the sensor 2 changes, The two elastic conductive bands 2a and 2b come into contact with each other and are in a short-circuited state.

As shown in FIG. 5, this sensor 2 is housed in a flexible tube 5 such as vinyl chloride.

At both ends of the tube 5, cut out two protruding pieces 5a.
The projecting piece 5a is attached to the mounting member 7 with the screw 6, and the mounting member 7 is mounted with the hooking member 9 via the decorative metal member 8 fitted to this.

On the other hand, lead wires 10a, 11a, 10b, 11b are connected to both ends of the spring conductive bands 2a, 2b, respectively.
The a, 11a, 10b and 11b are led out from the hole 8a of the decorative metal fitting 8 to the outside.

As shown in FIG. 1, the alarm device 1 is provided with a power transformer 12 in which a primary side coil 12a is connected to a power source of AC100V, and the lead wire 10a is connected to a power transformer 12 via a resistor R. Is connected to one terminal of the secondary coil 12b.

The lead wire 11b is connected to the other terminal of the secondary coil 12b,
The lead wires 10b and 11a are connected to both ends of the coil RL ₁ of the relay RL.

The power transformer 12 is further provided with one secondary coil 12c, which has a contact S ₁ of the switch SW of the relay RL.
Buzzer B and alarm lamp L ₁ are connected via.

Furthermore, the switch SW of the relay RL is connected to the secondary coil 12c.
The power lamp L ₂ is connected via the contact S ₂ of the.

In the alarm device 1, when the spring conductive bands 2a and 2b are not in contact with each other, the current of the secondary coil 12b is the spring conductive bands 2a and 2b.
b, because the coil RL _{1 of the} relay RL flows through the resistor R,
The switch SW is pulled to contact the contact S ₂ .

Therefore, the current of the secondary coil 12c, which was lit by flowing a power light L _2, to indicate that the circuit is operating normally.

On the other hand, if the spring conductive bands 2a, 2b come into contact with each other to cause a short circuit, or if any of the lead wires 10a, 11a, 10b, 11b is disconnected, no current will flow in the coil RL _{1 of the} relay RL. .

Therefore, the switch SW leaves the contact S ₂ and contacts the contact S ₁ , so that the current of the secondary coil 12c is the buzzer B and the alarm lamp L.
₁ , the buzzer B emits an alarm sound, and the alarm lamp L ₁ lights up to indicate that there is a danger.

In the sensor 2 housed in the tube 5, the two elastic conductive bands 2a and 2b come into contact with each other when the curved state of the tube 5 changes.

Therefore, as shown in FIG. 7, if a pillar 13 is erected at the boundary of the dangerous work area and the hanging metal fitting 9 is hung on the hanging metal fitting 14, the observer or the like can lean into the dangerous work area. When the tube 5 is touched and the curved state is changed, as described above, the buzzer B of the alarm device 1 sounds and the alarm lamp L ₁ lights up to warn a visitor or the like of a dangerous state. It is a thing.

In the above-described embodiment, of the lead wires 10a, 11a, 10b, 11b led out of the decorative metal fitting 8, the thickness of the lead wires 10b, 11b returning inside the tube 5 is arbitrarily set.

Then, depending on the bending state of the tube 5, this lead wire
The degree of pressing of the synthetic resin film 4 of the sensor 2 is changed by 10b and 11b, and the degree of curvature of the tube 5 for contacting the elastic conductive bands 2a and 2b can be arbitrarily set. Therefore, sensitivity adjustment must be performed. Is something that can be done.

When the number of columns 13 is three or more and the tubes 5 are hung between the columns 13, the lead wires 10b and 11b are led out from the other decorative metal fitting 8 and the lead wire 10a of the next tube 5 is drawn. ,
Each sensor 2 is connected in series so as to be connected to 11a.

By doing so, any one of the tubes 5
When an observer or the like comes into contact with, a warning similar to the above can be issued.

Furthermore, by fitting a ring of a desired length in the middle of the tube 5 and screwing a screw into this ring, and tightening this screw, the tube 5 is deformed and the synthetic resin coating 4
The degree of pressing changes, and the sensitivity can be adjusted in the same manner as described above.

[Effect of device]

According to the present invention, as described above, if a sensor made up of two elastic conductive bands is housed in a tube and stretched around a dangerous work area such as a robot or an excavator, it is possible When a person leans into the dangerous work area and comes into contact with the tube and changes the curved state, the buzzer or lighting can warn of the danger.

Therefore, it is not necessary to place a supervisor for the dangerous area in the work range, the labor cost can be saved, and the work cost can be reduced.

Then, the setting of the dangerous range has effects such that the setting of the tube is simple and the range can be easily changed.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an alarm device used in an embodiment of the present invention, FIG. 2 is a perspective view of a sensor, FIG. 3 is a sectional view thereof, FIG. 4 is a perspective view of a short-circuited state thereof, and FIG. FIG. 6 is an exploded perspective view of an embodiment of the present invention, FIG. 6 is an assembled perspective view thereof, and FIG. 7 is a perspective view of a state of use thereof. 1 ... Alarm device, 2 ... Sensor, 2a, 2b ... Spring conductive band, 3 ... Insulating spacer, 4 ... Synthetic resin coating, 7 ...
Mounting metal fittings, 8 ... decorative metal fittings, 9 ... hook metal fittings, 10a, 10b, 11
a, 11b …… Lead wire.

Claims (1)

[Scope of utility model registration request] 1. An insulating spacer is interposed between a pair of spring-like conductive bands to hold the two spring-like conductive bands in parallel and to insulate the outer surface thereof. A sensor covered with a film is built in a flexible tube, hooking metal fittings are attached to both ends of the flexible tube, and a lead wire connected to a spring conductive band of the sensor is alarmed by contact of the spring conductive band. An on-site protection device characterized by being connected to an alarm device that emits.