SU1586705A1 - Method and apparatus for protecting organs of vision in electric welding - Google Patents

Abstract

This invention relates to a welding technique for protecting eyes. The purpose of the invention is to increase the reliability of protection of organs of sight and improve the view of the welding zone. The method of protection of the organs of vision consists in blocking the luminous flux at the time of the electric arc flash before its termination, interrupting the welding current with a frequency equal to or greater than 16 Hz, delaying the unlocking moment of the welding current relative to the moment of locking the light-emitter. A device for implementing the method comprises a sync signal unit 1, a welding circuit 2, a first communication channel 3, a signal generator 4 connected to a light switch 5 and a power supply unit 6, serially connected differentiation unit 7, first diode 8, delay unit 9, second channel 10 b and a current interrupter 11, a second diode 12, a third communication channel 13 connected to a current interrupter 11. The device provides the convenience of the welder and the overview of the welding zone in the absence of the invention flicker. 2 п.ф. 1 il.

Description

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The invention relates to means of visu- ation of organs of vision during electric welding.

The purpose of the invention is to increase the efficiency and reliability of protection of the organs of z-rhenium and improve the view of the welding zone.

The method is carried out as follows.

The luminous flux is blocked at times of electric arc flash until it reaches about 1/1 and for the duration of its action, the welding current is interrupted at a frequency equal to or greater than 16 Hz, and the moment of unblocking the welding current is delayed relative to the locking of the svetozatvor.

The drawing shows a structural one (a device for carrying out

both.

The device comprises a synchronization unit 1, a welding circuit 2, a first channel 3 (|; in, a signal generator 4 connected by |; a light switch 5 and a power supply unit 6, | successively connected differentiation unit 7, first diode 8, unit 9 delays, a second communication channel 10 and a current interrupter 11, connected via a second diode 12 and third connection 13 to a second output of a differentiation unit 7 via a second input.

The method is based on the visual inertia of the eye. When the welding process with a frequency above 16 Hz is interrupted, the luminous flux from the welding zone IB is completely closed: the instant of extinction of the electric arc is closed from IB and fully closed at the time of the flash. The protection of the eyes when opening, the luminous shutter with a delay in relation to the moment of electric arc extinction is provided by the inertia of the luminous shutter, and the protection of the welding flux is delayed by: rant eye protection against ultraviolet radiation at the moment of arc flash. In this case, the welder freely observes the welding zone in the absence of flicker and harmful effects,

An example. The implementation of the method is illustrated by a device that operates as follows.

When welding on a direct current, the signal generator 4 in an autonomous mode generates control voltage pulses, which are fed to the light sensor 5 and to the differentiation unit 7. Svetozatvor 5 is transferred to the closed state. A pulse formed at the leading edge of the control voltage from the output of the differentiation unit 7 through the diode 8, the delay unit 9 and the second communication channel is fed to the first unlocking input of the pulse-controlled current interrupter 11

The delay time for switching on the welding current is not less than the maximum response time of the light gate 5. After the termination of the control voltage pulse, a pulse corresponding to the falling edge is formed at the second output of the differentiation unit 7, which through the second diode 12 and the third link 13 goes to the second blocking input breaker 11 current. Electric arc goes out. After the recovery time has elapsed, the lightning shutter opens, providing a guaranteed time guard interval.

As a result of gating the stream of light directed to the welder's eyes, the glow of the hot weld can be reduced to a value that allows one to dispense with the additional light filter.

Example 2. When operating at an alternating or pulsating current, the signal generator 4 operates in the synchronization mode using voltage pulses generated by the sync signal unit 1. The active phase and pause of the welding process are synchronized with the period of the welding voltage.

The communication channels between the welding target 2 and the mask for the convenience of welding work are performed by wireless ultrasonic or radio channels.

Claims (2)

1. A method of protection of organs of sight during electric welding, in which at the time of a flash of an electric arc they block the luminous flux before the end of its action time, characterized in that, in order to increase the reliability of protection of organs of sight and improve the view of the welding zone, the welding current is interrupted with a frequency equal to or more than 16 Hz, and the time of unlocking of the welding current is delayed in relation to the moment of locking the svetozatvor. 2. A device for protection of organs during electrical welding, containing a sync signal unit, an input connected to the welding circuit, and an output, via a communication channel, to a signal generator connected to a lightning plug and a power supply unit, in order to increase efficiency and reliability of protection of the organs of vision, the series-connected differentiation unit, the first diode, the delay unit, the second communication channel, and the current interrupter, connected in series with the sync signal unit in the welding circuit, are additionally introduced into it second differentiating unit output via a second diode and a third communication channel coupled to the second input of chopper current, and input - with the output signal generator, the communication channels are made in the form of a wireless radio or ultrasound.