CN106344263B - A kind of multi-functional automatic darkening welding filter lens of high darkness - Google Patents
A kind of multi-functional automatic darkening welding filter lens of high darkness Download PDFInfo
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- CN106344263B CN106344263B CN201610762182.5A CN201610762182A CN106344263B CN 106344263 B CN106344263 B CN 106344263B CN 201610762182 A CN201610762182 A CN 201610762182A CN 106344263 B CN106344263 B CN 106344263B
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- 238000003466 welding Methods 0.000 title claims abstract description 40
- 230000003287 optical effect Effects 0.000 claims abstract description 30
- 238000001914 filtration Methods 0.000 claims abstract description 29
- 239000005304 optical glass Substances 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims description 2
- 238000005498 polishing Methods 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 3
- 101000894525 Homo sapiens Transforming growth factor-beta-induced protein ig-h3 Proteins 0.000 description 4
- 102100021398 Transforming growth factor-beta-induced protein ig-h3 Human genes 0.000 description 4
- 208000028485 lattice corneal dystrophy type I Diseases 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/04—Eye-masks ; Devices to be worn on the face, not intended for looking through; Eye-pads for sunbathing
- A61F9/06—Masks, shields or hoods for welders
- A61F9/065—Masks, shields or hoods for welders use of particular optical filters
Abstract
The invention discloses a kind of high multi-functional automatic darkening welding filter lens of darkness, including optical filtering mirror body, the optical filtering mirror body is by ultraviolet/infrared fileter, first LCD, 2nd LCD, 3rd LCD and optical glass sheet composition, it is connect in the bottom side of ultraviolet/infrared fileter with optical glass sheet, the first LCD is connected in turn in ultraviolet/infrared filtering on piece, 2nd LCD and the 3rd LCD, first LCD, the two sides of 2nd LCD and the 3rd LCD are mounted on control circuit, the input terminal and external power supply of control circuit are electrically connected, the output end of control circuit is electrically connected at the first LCD, on the two sides input interface of 2nd LCD and the 3rd LCD.The present invention realizes that automatic beam change optical filtering highest darkening darkness is 15 grades, meets the requirement of client's electric welding machine very high current welding by the improvement of LCD and the adjustment of control circuit；Simultaneously product it is standby or for polish function when reach 4 grades of darkness, convenient for client it is clearer observation welding or polishing workpiece.
Description
Technical field
The present invention relates to welding operation safety equipment technical field, especially a kind of multi-functional automatic beam change welding of high darkness
Optical filtering.
Background technique
Currently, automatic beam change optical filtering function is more and more, such as welding function, function of polishing, and cutting function, each function
Darkness level can be required inconsistent, for example it is No. 9 to No. 13 that welding function, which generally requires darkness level, darkness level according to
Welding current and personal use habit determine；Polishing function generally requires to be lower than No. 4, and darkness level is lower, and when sanding operation is seen
It is about clear to examine form；And cutting function then generally requires No. 5 to No. 8.
According to national standard " GBT 3609.2-2009 occupation eye face protection welding protection part 2 " clause 3 and European Union
The requirement of standard " BS EN 379-2003(people eye protection-automatic beam change optical filtering) " 4.3.1 clause, automatic beam change filter
Darkness level and product institute attainable highest darkness level no more than 9 darkness levels of the light microscopic when power supply is closed, than
If the most common darkness level is 4/9-13 to automatic beam change optical filtering at present, indicate that darkness is No. 4 when product does not work, product work
Adjustable darkness level range is No. 9 to No. 13 when making, and No. 13 are highest darkness level, and darkness level is just when not working
For 9 grades, meet the requirements of the standard.
B.3 and European Union according to national standard " GBT 3609.2-2009 occupation eye face protection welding protection part 2 " table
Standard " BS EN 379-2003(people eye protection-automatic beam change optical filtering) " requirement of Table A.3, if a automatic
The highest darkness level of darkening optical filtering is 13 grades, then under normal circumstances, maximum welding current is in 400A or so.
With the development and industrial demand of electric welding machine industry, the electric current of electric welding machine welding is increasing, at present city
The electric welding machine that many maximum currents are more than 500A is had already appeared on face, if the darkness level of automatic beam change optical filtering cannot mention
Height, then will be unsuitable for these novel high current welding machines.
A automatic beam change optical filtering improves highest darkness level and is relatively easy to.If improved to 14 grades, product exists
Darkness level must reach 5 grades when power supply is closed；If improved to 15 grades, product darkness level when power supply is closed is necessary
Reach 6 grades.The visible light transmittance that 5 grades of darkness is 1.2%-3.2%, and the visible light transmittance that 6 grades of darkness is 0.4%-1.2%, thoroughly
Cross that rate is so low, welder is difficult clearly to check the details of object when observing weld seam or sanding operation after the completion of welding, it will
Extreme influence production efficiency, while increasing the fatigue of welder's eyes.
Summary of the invention
The purpose of the present invention is to provide a kind of high multi-functional automatic darkening welding filter lens of darkness, to solve above-mentioned background
The problem of being proposed in technology.
To achieve the above object, the invention provides the following technical scheme:
A kind of multi-functional automatic darkening welding filter lens of high darkness, including optical filtering mirror body, the optical filtering mirror body is by ultraviolet/red
Outer optical filter, the first LCD, the 2nd LCD, the 3rd LCD and optical glass sheet composition, bottom side and light in ultraviolet/infrared fileter
Sheet glass connection is learned, is connected with the first LCD, the 2nd LCD and the 3rd LCD in turn in ultraviolet/infrared filtering on piece, described first
The two sides of LCD, the 2nd LCD and the 3rd LCD are mounted on control circuit, and the input terminal of control circuit electrically connects with external power supply
It connects, the output end of control circuit is electrically connected on the two sides input interface of the first LCD, the 2nd LCD and the 3rd LCD.
As a further solution of the present invention: when the external power supply of the first LCD, the 2nd LCD and the 3rd LCD are closed,
It is controlled by control circuit, the first LCD, the 2nd LCD and the 3rd both ends LCD no-voltage, the first LCD, the 2nd LCD and the 3rd LCD
It is in off position.
As a further solution of the present invention: polishing when the first LCD, the 2nd LCD and the 3rd LCD are in standby
Or stop welding observation state, it is controlled by control circuit, the 3rd LCD is changed into illuminated state by dark-state.
As a further solution of the present invention: when the first LCD, the 2nd LCD and the 3rd LCD are in welded condition, leading to
Control circuit control is crossed, the first LCD and the 2nd both ends LCD apply voltage, the first LCD and the 2nd in running order change of LCD13
Secretly；Voltage is not added in 3rd both ends LCD, it is made to restore dark-state.
As a further solution of the present invention: the optical filtering mirror body is fixedly mounted on protective face mask.
As a further solution of the present invention: the optical glass on piece is also equipped with light-sensitive detector.
Compared with prior art, the invention has the advantages that:
This high multi-functional automatic darkening welding filter lens of darkness plays the work of protection operating personnel's safety in welding operation
Tool；Sunshade lens are combined into using good LCD and glass plating group, the photoinduction system on eyeglass can be when detecting electric welding moment
The generation and disappearance of arc light drive rapidly liquid crystal shading discoloration etc. to reach safely and effectively filtering noxious light, to protect
The injury that eye, the face of welder avoids arc light from radiating, provides comprehensive protection preferably for welder.
This high multi-functional automatic darkening welding filter lens of darkness, when power supply is closed, darkness level is 6 grades, and in standby shape
It is 4 grades when state or polishing state, highest darkness level is then up to 15 grades, not only meets relevant criterion requirement, but also be applicable in each
Kind welding condition, while 15 grades of highest darkness are also the current highest darkness level of automatic beam change optical filtering on the market.
This high multi-functional automatic darkening welding filter lens of darkness is realized certainly by the improvement of LCD and the adjustment of control circuit
Dynamic darkening optical filtering highest darkening darkness is 15 grades, meets the requirement of client's electric welding machine very high current welding；Simultaneously product to
Machine or for polish function when reach 4 grades of darkness, convenient for client it is clearer observation welding or polishing workpiece；In addition, product
In the case where power supply is closed, darkness level is 6 grades, to meet CEEN379 standard, guarantees that product can export European market.
Detailed description of the invention
Fig. 1 is automatic darkening welding filter lens power down state structural schematic diagram of the invention；
Fig. 2 is automatic darkening welding filter lens standby mode structural schematic diagram of the invention；
Fig. 3 is automatic darkening welding filter lens welded condition structural schematic diagram of the invention；
Fig. 4 is circuit control principle figure of the invention.
In figure: 1- optical filtering mirror body, 11- be ultraviolet/infrared fileter, the first the 2nd the 3rd LCD of LCD, 14- of LCD, 13- of 12-,
15- optical glass sheet, 151- light-sensitive detector, 16- control circuit.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig. 1-4, in the embodiment of the present invention, a kind of high multi-functional automatic darkening welding filter lens of darkness, including filter
Light microscopic body 1, optical filtering mirror body 1 are fixedly mounted on protective face mask, optical filtering mirror body 1 by ultraviolet/infrared fileter 11, the first LCD12,
2nd LCD13, the 3rd LCD14 and optical glass sheet 15 form, and are also equipped with light-sensitive detector 151 on optical glass sheet 15,
The bottom side of ultraviolet/infrared fileter 11 is connect with optical glass sheet 15, is connected with first in turn on ultraviolet/infrared fileter 11
The two sides of LCD12, the 2nd LCD13 and the 3rd LCD14, the first LCD12, the 2nd LCD13 and the 3rd LCD14 are mounted on control electricity
Road 16, the input terminal and external power supply of control circuit 16 are electrically connected, and the output end of control circuit 16 is electrically connected at first
On the two sides input interface of LCD12, the 2nd LCD13 and the 3rd LCD14.
When the external power supply of first LCD12, the 2nd LCD13 and the 3rd LCD14 are closed, controlled by control circuit 16, the
One LCD12, the 2nd LCD13 and the 3rd both ends LCD14 no-voltage, the first LCD12, the 2nd LCD13 and the 3rd LCD14 are in not
Working condition, darkness level are No. 6.It polishes or stops when first LCD12, the 2nd LCD13 and the 3rd LCD14 are in standby
Observation state is welded, is controlled by control circuit 16, the 3rd LCD14 is changed into illuminated state by dark-state, and darkness level falls to 4 at this time
Number, form is apparent from.When first LCD12, the 2nd LCD13 and the 3rd LCD14 are in welded condition, controlled by control circuit 16
System, the first LCD12 and the 2nd both ends LCD13 apply voltage, adjust LCD both end voltage, and darkness level changes therewith, and first
LCD12 and the 2nd LCD13 are in running order dimmed；Voltage is not added in 3rd both ends LCD14, its is made to restore dark-state, in this way can be with
The operating voltage for reducing No. 1 and No. 2 LCD, reduces the power consumption of product.
Referring to Fig. 4, in the embodiment of the present invention, a kind of high multi-functional automatic darkening welding filter lens of darkness, in control electricity
It in road 16, is made of integrated circuit U1, integrated circuit U1 is a CD4093, it is by four 2 input terminal Schmidt trigger electricity
Road composition.Each circuit is 2 input nand gates for having Schmitt Trigger Function in two input terminals.Any one of NAND gate
Input terminal is low level, then other input terminals change in any case, and output is high level forever；When fully enter end all in
When high level, low level is just presented in output end.
Integrated circuit CD4093 realizes following functions:
First group of NAND gate U1A is used as self-maintained circuit, generates square-wave signal.1 foot and 2 feet are connected to resistance and capacitor
Between, by the charging and discharging of capacitor C1 and resistance R1, oscillation square wave is exported in 3 foot of output end, the frequency of square wave is by capacitor
The capacitance of C1 and the resistance value of resistance R1 determine, by taking U1A as an example, as capacitor C1=4700pf, and when resistance is 1.2M, the side of 3 feet output
Wave frequency rate is between 40-50Hz.
Second group of NAND gate U1B is overturn as signal, when input signal is high level, is exported as low level, conversely, working as
When input is low level, export as high level.When FB1 is high level, FB2 is low level；When FB1 is low level, FB2 is height
Level.
Third group NAND gate U1C and first group of U1A purposes are the same, are used as oneself oscillating circuit, generate square-wave signal.Square wave
Frequency determined by the capacitance of capacitor C2 and the resistance value of resistance R2, by taking U1C as an example, as capacitor C2=2.2uf, when resistance is 10MM,
The square wave frequency of 10 feet output is in 0.1Hz or so.
4th group of NAND gate U1D and second of U1B purposes are consistent, are used as signal and overturn.When K1 input signal is high level
When, K2 exports low level, on the contrary.K2 exports high level.
Integrated circuit U2 and U3 be all be HEF4053, it is a simulant electronic switch, includes three tunnels " single-pole double throw " and opens
It closes, is controlled by the signal of micro computer output, to switch over and select to signal.Using 16 foot dual inline type plastic package structures,
It is as shown in the table that it controls corresponding relationship.
When automatic beam change optical filtering is not subjected to, light-sensitive detector 151 is inputted without signal, controls signal
K1 is low level 0, no matter control signal FB1 and FB2 is in which kind of state, no electricity between two spelling feet of LCD1LCD2 at this time
Pressure, therefore LCD1 and LCD2 cannot work.Product is in standby.
When automatic beam change optical filtering is subjected to, light-sensitive detector 151 receives optical signal, and control signal K1 is height
Level 1, controlling signal FB1 and FB2 at this time is square-wave signal, and when one of them is high level, another is then low level.
Having pressure difference Vt, Vt between two spelling feet of LCD1LCD2 is an adjustable voltage, by adjusting the amplitude of Vt, can control LCD
Darkening darkness, realize and adjusted between darkness 9-15, therefore LCD1 and LCD2 are in running order.Product is in welded condition
After power supply is closed, chip does not have operating voltage, and output pin output voltage is 0, therefore LCD1 and LCD2 cannot
Work.Product is in close state.
When automatic beam change optical filtering is not subjected to, light-sensitive detector 151 is inputted without signal, controls signal
K1 is low level 0, and control K2 and K1 is on the contrary, K2 is high level 1.Control signal FB3 is square-wave signal at this time, no matter which kind of is in
State, having voltage VCC-H between two spelling feet of LCD3, wherein-VCC-H is a negative voltage, and negative pressure amplitude is about -10V,
It can guarantee to be in most bright state when LCD3 work, therefore the in running order illuminated state of LCD3, the darkness level of entire LCD combination
It is No. 4.Product is in standby.
When automatic beam change optical filtering is subjected to, light-sensitive detector 151 receives optical signal, and control signal K1 is height
Level 1, control K2 and K1 is on the contrary, K2 is low level 0.Signal FB3 is controlled at this time
No matter which kind of state be in, without voltage between two spelling feet of LCD3, therefore to be in off position dark by LCD3
The adjusting of darkness 9-15 grade may be implemented by the combination with LCD1 and LCD2 in state.Product is in welded condition.
After power supply is closed, chip does not have an operating voltage, and output pin output voltage is 0, therefore LCD3 does not work dark-state
The darkness level of entire LCD combination is No. 6.Product is in close state.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (2)
1. a kind of multi-functional automatic darkening welding filter lens of high darkness, including optical filtering mirror body (1), it is characterised in that: the optical filtering
Mirror body (1) is by ultraviolet/infrared fileter (11), the first LCD(12), the 2nd LCD(13), the 3rd LCD(14) and optical glass sheet
(15) it forms, is connect in the bottom side of ultraviolet/infrared fileter (11) with optical glass sheet (15), in ultraviolet/infrared fileter
(11) be connected with the first LCD(12 in turn), the 2nd LCD(13) and the 3rd LCD(14), the first LCD(12), the 2nd LCD
(13) and the 3rd LCD(14) two sides be mounted on control circuit (16), the input terminal of control circuit (16) and external power supply electricity
Property connection, the output end of control circuit (16) is electrically connected at the first LCD(12), the 2nd LCD(13) and the 3rd LCD(14) two
On the input interface of side；
Light-sensitive detector (151) are also equipped on the optical glass sheet (15)；
Wherein, the control circuit (16) is made of integrated circuit U1, integrated circuit U2 and integrated circuit U 3, the integrated circuit
U1 is made of four 2 input terminal Schmitt trigger circuits, and each circuit is to have Schmitt Trigger Function in 2 input terminals
2 input nand gates, respectively first group of NAND gate U1A, second group of NAND gate U1B, third group NAND gate U1C and the 4th group with it is non-
Door U1D, integrated circuit U2 and U3 are simulant electronic switches, include three tunnels " single-pole double throw " switch, the signal exported by micro computer
Control, to switch over and select to signal, using 16 foot dual inline type plastic package structures；
First group of NAND gate U1A is used as self-maintained circuit, generates square-wave signal, 1 foot of input terminal and 2 feet are connected to resistance and electricity
Between appearance, by the charging and discharging of capacitor C1 and resistance R1, oscillation square wave is exported in 3 foot of output end, the frequency of square wave is by electricity
The resistance value of the capacitance and resistance R1 of holding C1 determines；
Second group of NAND gate U1B is overturn as signal, when input signal is high level, is exported as low level, conversely, when input
When for low level, export as high level；
Third group NAND gate U1C and first group of U1A purposes are the same, are used as self-maintained circuit, generate square-wave signal, the frequency of square wave
Rate is determined by the capacitance of capacitor C2 and the resistance value of resistance R2；
4th group of NAND gate U1D and second of U1B purposes are consistent, are used as signal and overturn；
The control method of the multi-functional automatic darkening welding filter lens of high darkness are as follows:
When not being subjected to, the light-sensitive detector (151) without signal input, the first LCD(12), second
LCD(13) and the 3rd LCD(14) when being in standby, pass through control circuit (16) and control, the 3rd LCD(14) changed by dark-state
For illuminated state；
When automatic beam change optical filtering is subjected to, the light-sensitive detector (151) receives optical signal, the first LCD
(12), the 2nd LCD(13) and the 3rd LCD(14) be in welded condition when, pass through control circuit (16) control, the first LCD(12)
Apply voltage, the first LCD(12 with the both ends the 2nd LCD(13)) and the 2nd LCD(13) in running order, and pass through the group of the two
Closing, the adjusting of darkness level, the 3rd LCD(14 may be implemented) voltage is not added in both ends, and so that its is restored dark-state；
When power supply close after, the first LCD(12), the 2nd LCD(13) and the 3rd LCD(14) external power supply closing, pass through
Control circuit (16) control, the first LCD(12), the 2nd LCD(13) and the 3rd LCD(14) both ends no-voltage, the first LCD(12),
2nd LCD(13) and the 3rd LCD(14) it is in off position.
2. a kind of high multi-functional automatic darkening welding filter lens of darkness according to claim 1, it is characterised in that: the filter
Light microscopic body (1) is fixedly mounted on protective face mask.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610762182.5A CN106344263B (en) | 2016-08-29 | 2016-08-29 | A kind of multi-functional automatic darkening welding filter lens of high darkness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610762182.5A CN106344263B (en) | 2016-08-29 | 2016-08-29 | A kind of multi-functional automatic darkening welding filter lens of high darkness |
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| CN106344263A CN106344263A (en) | 2017-01-25 |
| CN106344263B true CN106344263B (en) | 2019-05-14 |
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| CN201610762182.5A Active CN106344263B (en) | 2016-08-29 | 2016-08-29 | A kind of multi-functional automatic darkening welding filter lens of high darkness |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102607506B1 (en) * | 2017-06-15 | 2023-11-30 | 쓰리엠 이노베이티브 프로퍼티즈 캄파니 | Eye-protective headgear with automatic darkening filter comprising an array of switchable shutters |
| DE202023102563U1 (en) | 2023-02-28 | 2023-07-18 | Anhui Hengyu Optical Electronics Co., Ltd | protective face mask |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2035629U (en) * | 1988-07-09 | 1989-04-12 | 韩登昌 | Colour-changing protective glasses for welding |
| CA2670903C (en) * | 2008-07-08 | 2016-06-21 | Gang Chen | Battery low-voltage warning apparatus for auto-darkening filter for welding helmet |
| CN201328927Y (en) * | 2009-01-09 | 2009-10-21 | 赵放放 | Automatically light changing protective spectacle for electric welding |
| CN102217988B (en) * | 2010-04-13 | 2014-11-12 | 杨乐 | Dipping liquid crystal welding goggle |
| CN102551953B (en) * | 2012-03-08 | 2013-11-20 | 厦门高科防静电装备有限公司 | Automatic light-transforming blinkers for welding operation |
| CN103006376B (en) * | 2012-12-11 | 2014-12-10 | 北京工业大学 | Automatic variable light protection mask device and use application thereof |
| CN104107107A (en) * | 2013-04-19 | 2014-10-22 | 李骥超 | Goggles assembly structure in automatic variable-light welding mask |
| CN203341907U (en) * | 2013-07-08 | 2013-12-18 | 宁波吉欧斯达电子有限公司 | Auto darkening welding filter lens with self-checking function |
| CN203802662U (en) * | 2013-12-12 | 2014-09-03 | 宁波吉欧斯达电子有限公司 | Double-external-adjustment automatic light changing welding filter |
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2016
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