CN2032869U - Automatic light-covered protecting device for welding - Google Patents
Automatic light-covered protecting device for welding Download PDFInfo
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- CN2032869U CN2032869U CN 88201776 CN88201776U CN2032869U CN 2032869 U CN2032869 U CN 2032869U CN 88201776 CN88201776 CN 88201776 CN 88201776 U CN88201776 U CN 88201776U CN 2032869 U CN2032869 U CN 2032869U
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- liquid crystal
- potentiometer
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Abstract
The utility model relates to an automatic light-covered device used for protective helmets or protective hoods. The utility model is composed of a control circuit, a liquid crystal filter piece and a photoresistor. After the photoresistor acts on the control circuit, the transparence of liquid crystal is changed, and thus the light flux entering retina can be kept within a constant range to prevent strong light from glaring with arc light and observe operating point without the arc light. The light-electro response time reaches 0.02 seconds, the variance range of transmittance of the liquid crystal electric control adapts to various levels of arc light brightness.
Description
This utility model is the appliances for labor protection that block high light when being used for arc welding.Can be installed on head protector or the protective cover.
What the manual electric welder's helmet of existing insulation (BG85023524) adopted is openable screening glass, and the pressing bat-handle switch makes screening glass open, and forms 6～13MM window, makes the workman can observe the welding job orientation before striking.Because the arc light incandescent, striking is lighted after often under optical filter turnover, and this brings error to accurate grasp operating point, uses also inconvenient.United States Patent (USP) (U.S4237557) is the control system of a welding head protector, its major technique feature is: after welding arc extinguishes, the liquid crystal optical screen is opened automatically, and delayed time for 2～3 seconds, so that allow the welder observe weldment and do back works such as preheating welding rod, the circuit that provides adopts alternately time expander method, be that the liquid crystal shading screen is to occur transparent and opaque two states periodically, the welder must observe weldment and welding work pieces under the restriction in this cycle, use inconvenient, and control circuit can not guarantee it is square wave, and this brings liquid crystal and have a strong impact on service life.
The purpose of this utility model is in order to solve: no matter welding arc extinguishes or lights when electric welding, enters the adaptable normal range of eyes that amphiblestroid luminous flux remains on the people automatically, and the welder can handled easily.
In order to achieve the above object, design of the present utility model is: adopt liquid crystal material to make variable filter, after light detects to external world, change the output signal of control circuit through light-sensitive element, the transmittance of control liquid crystal makes to enter amphiblestroid luminous flux and keep constant substantially.
According to design, this utility model is a kind of device that is used on head protector or the protective cover, tumble in liquid crystal filter (or light filter) and photoconductive resistance at itself and the corresponding position of binocular, a control circuit is arranged on head protector or the protective cover, this circuit is connected with liquid crystal filter (or light filter) with photoconductive resistance, connects with the mains.
For satisfying the shading index of strong arc light, the minimum light transmission rate of liquid crystal filter should reach 4 * 10
-5About.The bright LCD panel of full impregnated of China's production at present, monolithic minimum light transmission rate can adopt three synergetic methods of LCD panel to make the minimum light transmission rate reach 4 * 10 about 3%
-5, this stack is three LCD panels and four alternately stacks of polarized light piece.This structure has light transmission preferably when having guaranteed no arc light, can see operating point clearly; Guaranteed also that when high light adjusting by light sensor and control circuit reaches shading and protects the purpose effect.
Fig. 1: for this utility model is used in entity sketch map on the head protector.Protective cover (5) can rotate around axle (10), and controls semi-automatic on and off switch (6) with power supply (9) connecting and disconnecting.Other relative section is regulator potentiometer (1) (according to the thickness of workpiece different adjustment), control circuit (2), photoconductive resistance (3), liquid crystal shading screen (4), switch (6), head protector (7), battery folder (8), battery (9).
Fig. 2: be the schematic diagram of control circuit (2).With integrated package (2,1) is core, different peripheral cells is set respectively reaches the control function.(1) square-wave generator is formed in capacitor (16), resistance (14), (15), (17) and (27), and frequency is by electric capacity (16) and resistance (17) decision.(2) resistance (26), (28), (29) are that the bipolarity waveform forms circuit.(3) lead-in wire (18), (25) later signal input circuit are sensing element and the functional devices relevant with control.Wherein have: resistance (19), (24), electric capacity (20), (23), potentiometer (1), photoconductive resistance (3), light modulation LCD panel (4.1), (4.2), resistance (19) is in parallel with electric capacity (20), potentiometer (1), photoconductive resistance (3) respectively with LCD panel (4.1), (4.2) parallel connection in parallel, three parallel circuits link to each other with integrated package (2.1) by lead-in wire (18), (25) series connection.(4) power circuit of being made up of battery (9), switch (6), resistance (12), audion (13), stabilivolt (30), it is provided with for prolonging battery service life and job stability.
Fig. 3: be the in parallel wiring schematic diagram of liquid crystal shading screen (4) among Fig. 1 with photoconductive resistance (3).
Fig. 4: among Fig. 3 along the cutaway view of A～A line.Wherein (32) are polarized light piece, and (33) are liquid crystal group sheet, and they are formed by stack.
Fig. 5: when adopting different initial transmittance optical filter, component is made the schematic diagram of change.Photoconductive resistance (3,1) is in parallel with capacitor (20), photoconductive resistance (3,2) is in parallel with capacitor (23), link to each other with two ends (21), (22) of the LCD panel of parallel connection respectively, in parallel with potentiometer (1) again, two ends link with resistance (41), (42) respectively, connect with integrated package (2,1) by lead-in wire (18), (25).Liquid crystal filter among the figure (4,1), (4,2) are transparent when adding the signal of telecommunication and be zero, claim that it is a positive, and be just opposite with optical filter among Fig. 2 (4,1), (4,2).
Fig. 6: for replace the situation of variable resistance (1) among Fig. 2 with bias light photoconductive resistance (43).Photoconductive resistance (43) produces the arc light of different mean flow rates when only detecting owing to welding different-thickness workpiece.Therefore photoconductive resistance (43) be placed on direct projection less than the place: the character of this light is similar to bias light (L
1).Because photoconductive resistance (43) is arranged, it can change manually is automatically, and photoconductive resistance (3) is to detect direct light (L).
Fig. 7: for detect the situation that photoconductive resistance (43) replaces the variable resistance (1) among Fig. 5 with bias light, LCD panel (4,1) (4,2) is a positive.
Accompanying drawing has also provided embodiment of the present utility model simultaneously, in conjunction with it is described further.When putting on head protector, on and off switch moving plate (34) and stator (35) are connected among Fig. 8, this power supply passes through by audion (13), the mu balanced circuit that stabilivolt (30) and resistance (12) are formed is added on the integrated package (2,1), this voltage makes by resistance (14), (15), (17), (27) and capacitor (16) and produces a stable square-wave signal.But this square wave is a unipolar signal, can not be added on the two ends of liquid crystal filter (4,1), (4,2), therefore, pass through the reversed polarity translation circuit of peripheral resistance (26), (28), (29) composition again, at lead-in wire (18), polarity reversing signal of (25) two ends output, the characteristics of this signal are: average current and voltage at lead-in wire (18), (25) two ends are zero, and the instantaneous voltage value of signal approaches the output amplitude of audion (13).
Suppose the liquid crystal filter (4 that we adopt, 1), (4,2) be negative film, the situation of Fig. 2, when promptly being added on its dipolar instantaneous voltage value and being zero, be opaque, shading mechanism in this case is: when direct projection at photoconductive resistance (3) and liquid crystal filter (4,1), (4, when the light 2) is strong, the resistance of then photoconductive resistance (3) will be littler, therefore by resistance (19), (24), the equivalent resistance of photoconductive resistance (3) and variable resistance (1) equivalent resistance in parallel, and electric capacity (20), (23) bleeder circuit of forming with the equivalent capacity of liquid crystal filter institute tool, the instantaneous voltage amplitude at liquid crystal filter two ends is diminished, according to liquid crystal filter is the characteristic of negative film, its light transmission is little, and promptly liquid crystal filter is under high light, and its light transmission is poor.
Secondly, when the light of direct light on photoconductive resistance (3) and liquid crystal filter (4,1), (4,2) when being weak, the resistance of then photoconductive resistance (3) is big.According to the potentiometer principle, the magnitude of voltage that is distributed on the liquid crystal filter will be bigger, and according to the function of liquid crystal negative film, its transmittance will be preferably.Be light when weak, the optical filter light transmission is good.
When welding during steel plate, its arc light is brighter, at this moment variable resistance (1) is turned down, makes in the voltage decreases at liquid crystal filter two ends a bit, so transmittance becomes littler.As when welding sheet metal, variable resistance (1) is transferred big, to adapt to the workpiece that welds various different-thickness.
In order to reach the light about 0.02 second---the electroresponse time, capacitor (20), (23) play an important role, and this is because they satisfy following condition:
{ R(19)+R(14)+R(21) 11R(3) } { C(23), series connection C(20) }
=R(19) (C(20) C(23 that connects)) 11C(liquid crystal equivalent capacity)
Fig. 5 is the situation that adopts positive: when direct light when being strong, photoconductive resistance (3,1), (3,2) resistance diminish, so eclipser (4,1), (4,2) both end voltage are higher, and transparency is descended.Opposite situation is then also opposite.
Fig. 6 is with detection background light (L
1) photoconductive resistance (43) replaced the variable resistance among Fig. 2 (1), the different mean arc brightness that make it can regulate work piece thickness difference automatically and occur can change according to the size of human eye pupil to cause the luminous flux that enters eyes.
Fig. 7 is with the potentiometer (1) among photoconductive resistance (43) replacement Fig. 5, analyzes the same.
Claims (7)
1, a kind of welding is with automatic sunscreen protection device, by control circuit (2), power supply (9), LCD filters (4) protective cover (5) are formed, and it is characterized in that being provided with in the control circuit (2) the described signal input circuit employing of a signal input circuit photoconductive resistance is signal receiving element.
2, preventer according to claim 1 is characterized in that: liquid crystal filter device (4) is formed by stacking by one or more pieces liquid crystal filters (33) and polarized light piece (32) intersection.
3, preventer according to claim 1, it is characterized in that control circuit by integrated package (2.1), square-wave generator, power circuit, the bipolarity waveform forms circuit and signal input circuit is formed.
4, preventer according to claim 3, it is characterized in that signal input circuit is by resistance (19), (24), electric capacity (20), (23), potentiometer (1) and photoconductive resistance (3) are formed, resistance (19) is in parallel with electric capacity (20), potentiometer (1), photoconductive resistance (3) respectively with LCD panel (4.1), (4.2) parallel connection in parallel, resistance (24) is in parallel with electric capacity (23), three parallel circuits link with integrated package (2.1) by the series connection of lead-in wire (18) (25).
5, preventer according to claim 4 is characterized in that: replace potentiometer (1) with photoconductive resistance (43).
6, preventer according to claim 3: it is characterized in that: signal input circuit is by resistance (41), (42), potentiometer (1), capacitor (20), (23), photoconductive resistance (3.1), (3.2) form, photoconductive resistance (3.1) is in parallel with capacitor (20), photoconductive resistance (3.2) is in parallel with capacitor (23), respectively with the two ends (21) of LCD panel in parallel, (22) link to each other, in parallel with potentiometer (1) again, two ends respectively with resistance (41), (42) link to each other, by lead-in wire (18), (25) connect with integrated package (2.1).
7, preventer according to claim 6 is characterized in that: replace potentiometer (1) with photoconductive resistance (43).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88201776 CN2032869U (en) | 1988-03-01 | 1988-03-01 | Automatic light-covered protecting device for welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88201776 CN2032869U (en) | 1988-03-01 | 1988-03-01 | Automatic light-covered protecting device for welding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2032869U true CN2032869U (en) | 1989-02-22 |
Family
ID=4836919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88201776 Withdrawn CN2032869U (en) | 1988-03-01 | 1988-03-01 | Automatic light-covered protecting device for welding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2032869U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102362827A (en) * | 2011-06-28 | 2012-02-29 | 吴江市精工铝字制造厂 | Protecting cap |
| CN107966834A (en) * | 2016-10-20 | 2018-04-27 | 泰克曼(南京)电子有限公司 | The automatic beam change filter of high shade number can be achieved |
-
1988
- 1988-03-01 CN CN 88201776 patent/CN2032869U/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102362827A (en) * | 2011-06-28 | 2012-02-29 | 吴江市精工铝字制造厂 | Protecting cap |
| CN107966834A (en) * | 2016-10-20 | 2018-04-27 | 泰克曼(南京)电子有限公司 | The automatic beam change filter of high shade number can be achieved |
| CN107966834B (en) * | 2016-10-20 | 2020-08-28 | 泰克曼(南京)电子有限公司 | Automatic light-changing filter capable of realizing high shading number |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |