CN2717416Y

CN2717416Y - Electric weldig goggles

Info

Publication number: CN2717416Y
Application number: CN 200420073952
Authority: CN
Inventors: 蒋群
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-11-03
Filing date: 2004-06-27
Publication date: 2005-08-17
Anticipated expiration: 2014-06-27

Abstract

The utility model relates to an electric welding goggle which can automatically change the light when the welding is started and before the electric arc light is generated. The lens is transversally assembled by LCD lens and ordinary black glass. The LCD light changing driving circuit is composed of a welding power supply voltage signal analyzing circuit, an oscillating circuit, and an LCD light changing circuit which are electrically connected in turn. According to the characteristic that the welding power supply voltage steeply drops down accordingly to the progressive increase of the arc current and the characteristic that the welding electric arc volt is quiet, when the work is in no-load or short circuit process, the driving circuit outputs no driving electric voltage, and the LCD is in light state; at this time, the welding point can be viewed or the short circuit can be processed through the LCD lens; when the welding is started, the welding current is generated, and the welding voltage drops down; the driving circuit obtains the trigger signals to output driving electric voltage, the LCD is in non-transparent state, and then the electric arc light is generated. Because the welding process can be viewed through the black glass at this time, the manufacturing technique of the LCD lens can use the dynamic scattering principle which is low in cost.

Description

Novel electric welding mirror

Affiliated technical field

This utility model relates to a kind of being used for and prevents the electric welding mirror that arclight damages eyes in electric welding work, and is especially can be when stopping welding transparent and play weldering and the novel electric welding mirror of deepening rapidly before arclight produces.

Background technology

At present, generally the electric welding mirror of Shi Yonging is a filter glass owing to generally being complete light tight state under the intensity of illumination, only can see solder joint clearly under the hard arc rayed, and inconvenience is arranged.Scheme and the new design of doing technological improvement thus have many, as the patent No. be: 87210173.8,91232458.9,9220803.9,93243505.X, 93244546.2, with 02204273.3, wherein last obviously takes advantage technically, its major technique feature is to utilize the optoelectronic induction technology, but still have weak point: one, though its response speed is exceedingly fast, at present, by the light-operated automatic color-changing mirror of Sanxin Electromechanical Inst., Hangzhou development by bright attitude to response time of dark attitude less than 0.5ms, but because LCD becomes the generation that light always lags behind arclight, so can not thoroughly eradicate the injury of arclight to eyes, for the moment that has reduced when weldering stimulates, the shade number when playing product and being bright attitude is 3～4; Two, must light modulation, under different welding current intensity, require the shade number difference of protective eye lens; Three, for the response speed that improves LCD and make no matter still can both see through the clear observation solder joint of LCD in dark attitude in bright attitude, the complex manufacturing technology of LCD, and must the special face shield of use, cost is too high.In addition, patent 93202624.9 adopts the two control techniques of magneto-optics, has solved above-mentioned defective (), but its poor anti jamming capability can not use by two above electric welding machines together, other machine that can produce electromagnetic interference can not be arranged in short range work.

Summary of the invention

For overcoming above-mentioned deficiency, this utility model patent provides a kind of can become light and the strong novel electric welding mirror of capacity of resisting disturbance before producing arclight.

The technical scheme that its technical problem that solves this utility model adopts is: increase and the volt-ampere static characteristic of rapid characteristic that reduces and welding arc with load according to source of welding current voltage, the voltage signal of the source of welding current is inputed to two voltage comparator circuits, one of them has been the floating voltage or the summary end that its comparative voltage of weldering voltage comparator circuit is set at the source of welding current, when playing weldering, source of welding current voltage reduces, and plays weldering voltage comparator circuit output signal upset (as by 1 → 0) this moment; Another is set in below the 10V for its comparative voltage of short-circuit voltage comparison circuit, because the shortest arc length is about 2mm, its smooth combustion voltage is between 10～20V, when short circuit appears in welding process, supply voltage levels off to 0V, short-circuit voltage comparison circuit output signal upset this moment.Then the signal of two voltage comparator circuit outputs is imported a gate circuit simultaneously, make when welding process is in normal processes, gate circuit output triggering signal is 1; When being in zero load or short circuit process, gate circuit output triggering signal is 0.Gate circuit output triggering signal is given an oscillating circuit, and when the gate circuit output signal was 1, oscillating circuit output square-wave voltage became optical circuit to LCD, and LCD is dark attitude; Otherwise the oscillating circuit output voltage is 0, and LCD is bright attitude.Total circuit structure is: source of welding current voltage signal is inputed to the voltage comparator circuit of two parallel connections, outputing signal to the light and shade state of oscillating circuit control LCD after handling through gate circuit.Two voltage comparator circuits and gate circuit can be referred to as source of welding current voltage signal analysis circuit.

Weld when initial, contact welding rod and weldment are instantaneous earlier, be short-circuited, the voltage of the source of welding current falls suddenly in this course, and triggering LCD moment becomes light; Powerful short circuit current causes the contact point place sharply to be heated up simultaneously, when mentioning welding rod rapidly, produces thermionic emission then, and forms welding arc.Because to mention be that process time must be greater than people's the natural reaction time from clicking to, approximately several seconds zero point, i.e. the generation of arclight lags behind the generation of welding current.And the change ray velocity of LCD is exceedingly fast, several milliseconds approximately, so eliminated the injury of arclight fully to eyes.In addition, in a single day LCD can brighten when being short-circuited in welding process, be convenient to timely processing.

More than be the circuit part principle, eyeglass part then becomes light microscopic by LCD and laterally combines with common filter glass, and when welding process is in just often, LCD is light tight, can see through filter glass observation solder joint this moment; When being in zero load or short circuit, LCD is bright attitude, can see through LCD spectroscopy welding quality this moment or carry out the short circuit processing.Owing in welding process, do not need to see through LCD sem observation solder joint, so the processing technology of LCD mirror can adopt dynamic scattering technology with low cost, and the high driving voltage that driving voltage can be transferred to fixedly that LCD becomes that light microscopic can bear makes it reach the maximum ray velocity that becomes, and need not light modulation.

Total structure is: the main circuit device is installed in the electric welding machine, is convenient to take source of welding current voltage signal and obtains the power supply of entire circuit from welder power (being generally 380V), and LCD mirror and common filter glass are combined into complete eyeglass and are installed on the face shield.Main circuit is connected with a shielding line parallel with the soldering turret line with the LCD mirror.

Must main circuit be the utility model proposes the differentiated slightly circuit design scheme of another kind with the defective that LCD change optical circuit links to each other with lead for overcoming, promptly on the design basis that does not change other circuit, source of welding current voltage signal analysis circuit and direct lead between the oscillating circuit are connected contact such as the remote sensing intermodule of using ultrasonic emitting, receiver module or frequency electromagnetic waves emission, receiver module instead send out.Source of welding current voltage signal analysis circuit and remote sensing transmitter module are installed in the welding machine in the circuit arrangement of this kind scheme, and remote sensing receiver module, vibration and LCD become light microscopic and be installed on the electric welder's helmet, and establish power supply in addition.

The beneficial effects of the utility model are: in first kind of design, owing to have only eyeglass to be installed on the face shield, thus do not need special face shield, simple in structure, with low cost; Second kind of design,, be not subjected to the interference of other machine works owing to adopt ultra-sonic remote control mode or adjustable electric magnetic wave remote control mode.Observe solder joint owing to not seeing solder joint but see through filter glass, so the manufacturing technology of LCD can adopt dynamic scattering technology with low cost through LCD at a postwelding.Because the change light of LCD is prior to the generation of arclight, arclight is to the injury of eyes in the time of can thoroughly preventing electric welding, and the transmitance during bright attitude can be set arbitrarily as required.

Description of drawings

Below in conjunction with drawings and Examples this utility model is further specified.

Fig. 1 is the circuit flow chart of first embodiment of this utility model.

Fig. 2 is the circuit flow chart of second embodiment of this utility model.

Fig. 3 is this utility model eyeglass structural map.

Fig. 4 is the physical circuit schematic diagram of first embodiment of this utility model.

Among the figure 1, LCD looking glass body 2, external electrode 3, transparency electrode 4, liquid crystal layer 5, sealing ring 6, filter glass

The specific embodiment

In first embodiment shown in Figure 1, be composed in series source of welding current voltage signal analysis circuit with a gate circuit after a weldering voltage comparator circuit and the parallel connection of short-circuit voltage comparison circuit; Source of welding current voltage signal analysis circuit, oscillating circuit and LCD become optical circuit and are electrically connected in proper order.

In second embodiment shown in Figure 2, between source of welding current voltage signal analysis circuit and oscillating circuit, be added with ultrasound wave or frequency electromagnetic waves remote sensing circuit, source of welding current voltage signal analysis circuit is launched the output state that receives control oscillation circuit through receiver module with processing signals by the remote sensing transmitter module, thus the light and shade state of control LCD.

In Fig. 3, the manufacturing technology of LCD mirror (1) is utilized the dynamic scattering principle; Liquid crystal layer (4) is a continuous level, and its area is shown in frame of broken lines; LCD mirror (1) is not fixedlyed connected with filter glass (5), so that use not homochromy number filter glass instead.External electrode (2) can adopt different processing technology.

In Fig. 4,, then welding electrode directly is connected on the dotted line place, and for AC welding set, then first blood pressure lowering rectification then is connected on the dotted line place again for DC welder.W1 is a divider resistance, and is generally more than several megaohms, adjustable at the welding realization of different floating voltages.R1～R4 is location resistance.Source of welding current voltage signal carries out voltage ratio through A1, A2 two voltage comparators, in normal welding process; A1, A2 export electronegative potential, through nor gate output high potential, and in zero load or short circuit process, A1 or A2 output high potential, nor gate output electronegative potential.The self-maintained circuit that oscillating circuit adopts 555 intervalometers to constitute.Nor gate output potential signal controlling 555 intervalometer forced resetting ends (4 end), when nor gate output high potential, oscillating circuit becomes optical circuit output square-wave voltage to LCD, LCD is dark attitude, when nor gate output electronegative potential, the output of oscillating circuit dead-beat signal, LCD is bright attitude.

Fig. 4 is the physical circuit schematic diagram of first embodiment, and second embodiment can add the remote sensing circuit between nor gate and 555 intervalometers, 4 ends.

Claims

1. novel electric welding mirror is characterized in that: eyeglass laterally combines with common filter glass by becoming the light microscopic sheet, becomes light microscopic sheet change light drive circuit and is electrically connected in proper order by source of welding current voltage signal analysis circuit, oscillating circuit and change light microscopic sheet circuit and forms.

2. novel electric welding mirror according to claim 1 is characterized in that: source of welding current voltage signal analysis circuit is composed in series with a gate circuit after by two voltage comparator circuit parallel connections.

3. novel electric welding mirror according to claim 1 is characterized in that: be added with ultrasound wave or frequency electromagnetic waves remote sensing circuit between source of welding current voltage signal analysis circuit and the oscillating circuit.

4. novel electric welding mirror according to claim 1 is characterized in that: become the light microscopic sheet and be installed on the electric welder's helmet with the filter glass combination, other partial circuit devices are installed in the electric welding machine, and are connected with change light microscopic sheet circuit with shielding line that the soldering turret line walks abreast with one.

5. novel electric welding mirror according to claim 3 is characterized in that: source of welding current voltage signal analysis circuit and remote sensing transmitting circuit are installed in the electric welding machine, the remote sensing receiving circuit, and oscillating circuit and change light microscopic sheet circuit arrangement are installed on the electric welder's helmet.