CN221039693U - Automatic dimming system for welding helmet and welding helmet including the same - Google Patents
Automatic dimming system for welding helmet and welding helmet including the same Download PDFInfo
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- CN221039693U CN221039693U CN202323060682.9U CN202323060682U CN221039693U CN 221039693 U CN221039693 U CN 221039693U CN 202323060682 U CN202323060682 U CN 202323060682U CN 221039693 U CN221039693 U CN 221039693U
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Abstract
自动变光系统包括具有液晶盒组件(LCD)的滤光镜及暗度控制系统，控制系统包括：微控制单元(MCU)；与其电连接的检测单元、参数设置单元、供电控制电路，检测单元检测起弧和熄弧操作下的光信号并将其转换为电信号发送至MCU；设置单元发送工作参数至MCU；MCU基于电信号及工作参数产生输出控制信号发送至控制电路；及在控制电路下游与其电连接的驱动电路，控制电路基于控制信号向驱动电路提供驱动LCD所需控制电压；驱动电路驱动LCD使其在亮、暗态间变换，熄弧操作后的一时延范围内，LCD连续暗度曲线按时序如下分布：一阶段暗度不变；二阶段暗度及变化率递减；三阶段暗度维持线性分布。本申请还涉及包括该自动变光系统的焊接面罩。
The automatic dimming system includes a filter with a liquid crystal box assembly (LCD) and a darkness control system, and the control system includes: a microcontroller unit (MCU); a detection unit, a parameter setting unit, and a power supply control circuit electrically connected thereto, wherein the detection unit detects light signals under arc starting and arc extinguishing operations and converts them into electrical signals and sends them to the MCU; the setting unit sends working parameters to the MCU; the MCU generates an output control signal based on the electrical signal and the working parameters and sends it to the control circuit; and a driving circuit electrically connected thereto downstream of the control circuit, wherein the control circuit provides the driving circuit with a control voltage required to drive the LCD based on the control signal; the driving circuit drives the LCD to switch between bright and dark states, and within a time delay range after the arc extinguishing operation, the LCD continuous darkness curve is distributed in the following time sequence: the darkness remains unchanged in the first stage; the darkness and the rate of change decrease in the second stage; the darkness maintains a linear distribution in the third stage. The present application also relates to a welding mask including the automatic dimming system.
Description
Technical Field
The utility model relates to the technical field of electric welding protection, in particular to an automatic dimming system with a mixed time delay characteristic for a welding mask.
Background
In the operations of welding, smelting, glass, ceramics, mechanical hot working and the like, production workers often contact heat sources such as a high-temperature furnace, the temperature of the heat sources is generally 1050-2150 ℃, and the corresponding heat radiation is in the middle-short infrared band of 0.78-3 microns. At this temperature, infrared rays and a large amount of visible light and ultraviolet rays can be generated in an amount of about 70% or more. Wherein, the ultraviolet ray generated by electric welding irradiates the eye ball for a short time to cause the damage of cornea and conjunctiva tissues (the most serious with 28nm light); and the intense infrared rays generated tend to cause clouding of the eye crystals. The goggles for electric welding can well block the infrared rays and ultraviolet rays. The lens is based on optical glass, adopts coloring agents such as ferric oxide, cobalt oxide, chromium oxide and the like, and is added with a certain amount of cerium oxide to increase the absorption of ultraviolet rays. The appearance is green or yellowish green. Can block all ultraviolet rays, has the infrared transmittance of less than 5 percent and the visible light transmittance of about 0.1 percent.
Typical goggles are non-variable light, filters for variable light are typically during welding, while in post-weld observations generally only provide a simple delay in weld protection darkness, fix darkness settings, and present a large range jump problem for darkness. The darkness mode of the conventional welding process is shown in fig. 1, and after the original darkness is maintained for a certain delay time after arc extinction, the dark state is steeply returned to the bright state, so that the temperature and the light intensity change of a high-current high-temperature welding pool cannot be flexibly adapted.
In an actual welding process, there are generally two types of scenes that are not very comfortable to apply. The method is characterized in that the method is high-current welding, the work piece keeps long light-emitting time after arc extinction, and a large time delay is required to be set, so that the work piece is easily invisible for a long time after arc extinction; the second type is rapid continuous spot welding, which must be set with a small delay, which can easily result in excessive contrast for withdrawal, causing repetitive irritation and fatigue of the eye. There is a need to find better delay control methods to solve these problems.
Currently there are generally two approaches to seek improvement. The first is for spot welding, after arc extinction, the spot welding enters a fixed lower darkness, and the spot welding is maintained for a period of time and then is restored to a bright state, wherein the darkness mode is shown in fig. 2; the second is to change the darkness from the working darkness step to the bright state during the arc quenching for a period of time after the arc quenching, and the darkness mode is shown in fig. 3. The first method described above can improve the rapid spot welding contrast, but the transition after arc extinction is too hard, still prone to glare, and is ineffective for long light-emitting times of high current welding workpieces. The second method has the advantages that the total time is required to be short during rapid spot welding, and the effect of reducing contrast cannot be achieved; for high current welding the work piece the total time must be set long, the speed of seeing the work piece is also delayed a little faster than without darkening, but still longer time is required.
It should be noted that the "background" section is only for aiding in understanding the present utility model, and thus the disclosure in the "background" section may contain some of the prior art that does not form part of the knowledge of one skilled in the art. The matters disclosed in the "background" section are not representative of the matters or problems to be solved by one or more embodiments of the present utility model, and are known or recognized by those skilled in the art prior to the application of the present utility model.
Disclosure of utility model
In view of the above-mentioned drawbacks of the prior art, it is necessary to provide an automatic dimming system capable of providing good protection after arc extinction under various welding conditions and a method for controlling the time delay and darkness after welding operation thereof, for various welding conditions such as long light holding time of the high-current molten pool and continuous spot welding.
To achieve the above object, the present utility model provides an automatic dimming system for a welding mask, the automatic dimming system including an automatic dimming filter including a liquid crystal cell assembly, and a control system controlling darkness thereof, the control system comprising:
a micro control unit;
The photoelectric sensor detection unit is electrically connected with the micro-control unit and is used for detecting light signals under the arc starting and extinguishing operation, converting the light signals into electric signals and sending the electric signals to the micro-control unit;
the working parameter setting unit is electrically connected with the micro control unit and is used for sending working parameters to the micro control unit;
the liquid crystal power supply control circuit is electrically connected with the micro control unit, and the micro control unit can generate an output control signal based on the electric signal and the working parameter and send the output control signal to the liquid crystal power supply control circuit; and
A liquid crystal driving circuit electrically connected to the liquid crystal power supply control circuit downstream thereof, wherein the liquid crystal power supply control circuit is capable of supplying a control voltage required to drive the liquid crystal cell assembly to the liquid crystal driving circuit based on an output control signal from the micro control unit;
The liquid crystal driving circuit drives the liquid crystal box assembly to change between a bright state and a dark state, wherein the continuous darkness curves of the liquid crystal box assembly are distributed in a time sequence within a certain time delay range after arc quenching operation as follows: in the first stage of the time delay range, the darkness is maintained unchanged; in the second stage of the time delay range, the darkness and the change rate of the darkness are decreased; and in a third phase of the time delay, the darkness maintains a linear distribution.
Preferably, the working parameters are preset working parameters when the automatic dimming system leaves a factory or manually input by an operator based on actual working conditions, and the working parameters comprise duration, starting darkness and ending darkness of each stage of the time delay range.
Preferably, the duration of the first phase is adjustable between 0 and 1000 milliseconds, the starting darkness and the ending darkness of the first phase being the first darkness of the liquid crystal cell assembly during an arc quenching operation.
Preferably, the duration of the second stage is adjustable between 100 and 300 milliseconds, the starting darkness of the second stage being a first darkness of the liquid crystal cell assembly during an arc quenching operation, the ending darkness of the second stage being a second darkness that is less than the first darkness.
Preferably, the duration of the third stage is adjustable between 0 and 2 seconds, the starting darkness of the third stage being the ending darkness of the second stage, and the ending darkness of the third stage being no greater than the starting darkness of the third stage and no less than the bright state darkness of the liquid crystal cell assembly.
Preferably, the first darkness is between DIN8 and 15 and the second darkness is between DIN3 and 7.
Preferably, the liquid crystal power supply control circuit includes a first liquid crystal power supply control circuit and a second liquid crystal power supply control circuit, and the automatic dimming system further includes a switch selectively turned on with the first liquid crystal power supply control circuit and the second liquid crystal power supply control circuit, wherein the first liquid crystal power supply control circuit is turned on with the switch in the first stage to supply the driving voltage to the liquid crystal driving circuit; and the second liquid crystal power supply control circuit is turned on with the change-over switch in the second stage and the third stage to supply the driving voltage to the liquid crystal driving circuit.
Preferably, the liquid crystal power supply control circuit comprises at least one of a digital-to-analog conversion module, a pulse width modulation module and an RC discharge module.
Preferably, the output control signal includes information about control voltages for driving the liquid crystal cell assembly at different timings within the time delay range, the control voltage of the first stage is greater than the control voltage of the entire second stage, and the control voltage at the end of the second stage is greater than the control voltage of the third stage.
According to yet another aspect of the present utility model, there is provided a welding mask, comprising: the automatic dimming system comprises a mask body and the automatic dimming system as described above, wherein an automatic dimming filter in the automatic dimming system is installed at a front opening of the mask body, and a control system in the automatic dimming system is integrally installed at the mask body.
According to the present application, a method for darkness control of an automatic darkening system for a welding helmet comprises the steps of:
Providing an automatic dimming system as described above;
setting the working mode of the automatic dimming system in a mixed time delay mode through the working parameter setting unit, and sending corresponding working parameters to the micro control unit;
Detecting optical signals under the arc starting and extinguishing operations by using the photoelectric sensor detection unit, converting the optical signals into electric signals and sending the electric signals to the micro-control unit;
When the micro control unit receives an electric signal representing an arc quenching operation, the micro control unit transmits an output control signal generated based on the working parameter to the liquid crystal power supply control circuit;
The liquid crystal power supply control circuit provides the control voltage required for driving the liquid crystal box component to the liquid crystal driving circuit based on an output control signal from the micro control unit; and
The liquid crystal driving circuit drives the liquid crystal box component to change between a bright state and a dark state, and the magnitude and the duration of the control voltage are configured so that the continuous darkness curve of the liquid crystal box component is distributed in the following time sequence within a certain time delay range after the arc quenching operation: in the first stage of the time delay range, the darkness is maintained unchanged; in the second stage of the time delay range, the darkness and the change rate of the darkness are decreased; and in a third phase of the time delay, the darkness maintains a linear distribution.
Preferably, the liquid crystal power supply control circuit adjusts the control voltage by means of at least one of digital-to-analog conversion, pulse width modulation and RC discharge.
Drawings
The foregoing and other aspects of the utility model are more fully understood and appreciated in conjunction with the following drawings, in which:
FIG. 1 is a schematic illustration of darkness pattern during a typical welding process according to the prior art;
FIG. 2 is a schematic illustration of a post-weld specific darkness pattern for a spot welding operation improvement of the prior art;
FIG. 3 is a schematic illustration of a post-weld specific darkness pattern modified for general operation in the prior art;
FIG. 4 is a schematic illustration of a darkness pattern of an optimized welding process in accordance with a preferred embodiment of the present utility model;
FIG. 5 is a schematic block diagram of an automatic dimming system with hybrid delay characteristics according to the present utility model;
FIG. 6 shows another alternative to the liquid crystal power control circuit used by the automatic dimming system of FIG. 5;
FIG. 7 is a schematic illustration of a welding mask equipped with an automatic dimming system having a hybrid delay feature according to the present utility model;
Fig. 8 is a block flow diagram of the operation of an automatic dimming system with mixed delay characteristics in accordance with the present utility model.
Detailed Description
In order to make the technical problems, technical solutions and advantageous technical effects to be solved by the present utility model more apparent, the present utility model will be further described in detail with reference to the accompanying drawings and exemplary embodiments. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the utility model. Unless explicitly stated otherwise in the drawings, the dimensions, locations, etc. of the various components, features, elements, etc. and any distances between them are not necessarily drawn to scale and may be disproportionate and/or exaggerated for clarity.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be recognized that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. When a range of values is recited, the upper and lower limits of the range, as well as any subranges therebetween, are included unless otherwise indicated. Unless otherwise indicated, terms such as "first," "second," and the like are used merely to distinguish one element from another. For example, one element may be referred to as a "first element" and, similarly, another element may be referred to as a "second element" and vice versa. The section headings used herein are for organizational purposes only and are not to be construed as limiting the subject matter described.
Unless expressly indicated otherwise, the terms "about," "substantially," and the like mean that quantities, dimensions, formulations, parameters, and other quantities and characteristics are not and need not be exact, but may be approximated and/or greater or lesser as desired.
All connections and all operative connections may be direct or indirect, unless expressly stated otherwise. Likewise, all connections and all operative connections may be rigid or non-rigid unless explicitly indicated otherwise. In addition, the term "connected" in the present utility model encompasses not only mechanical connections, but also electrical connections and communicative coupling between components and/or modules with each other.
Like numbers refer to like elements throughout. Accordingly, the same or similar reference numerals may be described with reference to other drawings even though they are neither mentioned nor described in the corresponding drawings. Moreover, even elements not labeled with a reference numeral may be described with reference to other figures.
Aiming at the problems in the background art, the application provides a method for controlling the mixed time delay of the darkness change of liquid crystal after arc extinction, and an automatic dimming system and a welding mask which can support the mixed time delay function.
Referring to FIG. 4, a schematic diagram of an optimized post-weld process darkness pattern is shown, according to a preferred embodiment of the present utility model. Compared with the darkness modes adopted in the prior art in fig. 1 to 3, the darkness change and the time delay of the automatic dimming system after welding are divided into three types according to time sequence, namely basic time delay, transition time delay and slow change time delay, so that the splicing of the three types of time delay and the connection corresponding to the darkness change of three stages are realized.
Three types of delay stages are described in detail below in connection with fig. 4. Note that, the ordinate in the figure shows DIN darkness (i.e., a shading number) defined in the industry, that is, the closer to the dark state, the greater the DIN darkness (corresponding to lower light transmittance); conversely, closer to the bright state indicates less DIN darkness (corresponding to higher light transmittance). Firstly, the time starts from the arc-quenching operation to a first phase (basic time delay phase t 1), the duration of which is adjustable between 0 and 1000 milliseconds, during which the darkness/shading number (generally between DIN8 and 15) of the weld upon arc-quenching is maintained, that is to say the starting darkness and the ending darkness D 1 of which remain consistent with the darkness D 0 (for example DIN 11) of the arc-quenching, thus meeting the protection requirements of the ultra-bright phase of the weld puddle of the workpiece immediately after arc-quenching. Next, when the first phase ends, a second phase (transition delay phase t 2) is entered, the duration of which is adjustable between 100 and 300 milliseconds (in the preferred embodiment set to 200 milliseconds, for example), the darkness transitions from the end darkness D 1 of the base delay to a second darkness D 2 (typically between DIN3 and 7, for example DIN5.5 in the illustrated preferred embodiment) that is lower than the end darkness of the base delay. In the second stage of the utility model the rate of change of darkness over time is decreasing, as compared to the stepwise change of darkness from the operating darkness to the bright state upon arc extinction in fig. 3. That is, in the second stage, the closer to the start point of the transition delay (i.e., the end point of the base delay) the greater the rate of change of darkness at that point in time (shown as steeper the darkness change curve in the figure), and the closer to the end point of the transition delay with time the lesser the rate of change of darkness at the corresponding point in time (shown as flatter the darkness change curve in the figure). Through the arrangement, the requirements of comfortable transition between darkness in a basic time delay stage and a gradual change time delay stage (described below) can be met, the problem of discomfort of visual contrast caused by the decline of darkness cliff is solved, and the operation environment of a workpiece can be observed clearly as soon as possible. Finally, when the second phase is ended, a third phase (slow-change delay phase t 3) is entered, the duration of which is adjustable (in the preferred embodiment set to 2 seconds, for example) between 0 and 3 seconds, the darkness transitions linearly from the ending darkness D 2 of the transition delay to a darkness (i.e. ending darkness D 3 of the third phase) which is no greater than the ending darkness of the transition delay and no less than the darkness corresponding to the bright state of the liquid crystal cell assembly of the automatic darkening filter (typically DIN 3-4). Taking the darkness mode shown in fig. 4 as an example, the ending darkness D 3 of the third stage is between the ending darkness D 2 of the second stage and the bright darkness D 4 of the liquid crystal cell assembly. However, it will be appreciated by those skilled in the art that the third darkness has two limit values, namely, when the third darkness is equal to the ending darkness D 2 of the second stage, the entire third stage corresponds to maintaining the ending darkness of the second stage unchanged (as shown by the broken line I in fig. 4); and when the third darkness is equal to the bright darkness D 4 of the liquid crystal cell assembly, the darkness change curve of the third stage is shown as a broken line II in fig. 4. Through the arrangement of the third stage (the slow-changing stage), a certain darkness of the liquid crystal box assembly before entering the bright state can be maintained, eyes of an operator can be protected from being stimulated by strong light, and the operator can be ensured to clearly observe the environment of a workpiece.
An automatic dimming system for realizing the mixed delay concept of the present utility model is described in terms of hardware. Referring to fig. 5, a schematic block diagram of an automatic dimming system according to the present utility model is shown. As shown in the drawing, the automatic dimming system includes an automatic dimming filter 10 (the automatic dimming filter is symbolically represented by a liquid crystal cell assembly LCD therein in a block diagram for simplicity, a filter for filtering infrared rays, ultraviolet rays, etc. is omitted), and a control system 20 for controlling darkness/shade number of the automatic dimming filter 10. The control system 20 comprises a micro control unit MCU, a photoelectric sensor detection unit 201, an operating parameter setting unit 202, a liquid crystal power supply control circuit 203 and a liquid crystal driving circuit 204, wherein the photoelectric sensor detection unit 201, the operating parameter setting unit 202, the liquid crystal power supply control circuit 203 and the liquid crystal driving circuit 204 are electrically connected with the liquid crystal power supply control circuit 203 at the downstream of the liquid crystal power supply control circuit 203. Wherein the photoelectric sensor detection unit 201 is configured to detect and convert optical signals in the arc starting and extinguishing operations into electrical signals and send the electrical signals to the micro control unit MCU. The working parameter setting unit 202 is configured to send working parameters to the MCU. In the present utility model, the micro control unit MCU can receive the operation parameters preset or input in the standby state from the operation parameter setting unit 202. The preset or input working parameters comprise welding parameters such as darkness control parameters, sensitivity control parameters, time delay control parameters and the like, and working mode parameters such as grinding, welding, cutting and the like. It will be appreciated by those skilled in the art that preset values for the base delay, the transition delay and the ramp delay may be preset for different operation modes at the time of shipment, including the duration of each delay stage and darkness values at the beginning and end of each delay stage, so that the hybrid delay control as shown in fig. 4 may be automatically performed according to the preset values in a desired operation mode. However, the present utility model is not limited thereto, and the operator may manually set the relevant parameters in conjunction with the actual conditions before the welding operation. Further, the micro control unit MCU can generate an output control signal based on the electric signal from the photosensor detecting unit 201 and the preset or input operation parameter from the operation parameter setting unit 202 and transmit it to the liquid crystal power supply control circuit 203. The liquid crystal power supply control circuit 203 in turn supplies a control voltage required to drive the liquid crystal cell assembly LCD to the liquid crystal driving circuit 204 based on an output control signal from the micro control unit MCU. In practical operation, driving signals representing corresponding control voltages in different time periods are sent to the liquid crystal driving circuit 204 by means of the liquid crystal power supply control circuit 203, and then the corresponding control voltages are applied to the liquid crystal cell assembly LCD of the automatic darkening filter 10 by the liquid crystal driving circuit 204, the transmittance of light in the dark state is adjusted by using the change in the orientation of the liquid crystal molecules in the liquid crystal cell to obtain a desired darkness, and the liquid crystal cell assembly LCD is caused to shift between the bright state and the dark state, thereby achieving a darkness higher in the time delay range immediately following the arc extinguishing operation as described above to protect the eyes of the operator from the stimulus of the bright molten pool, and a gradual decrease in darkness over a longer period of time to ensure that the operator is able to clearly view the welded workpiece and the surrounding environment.
As can be seen from the preferred embodiment shown in fig. 5, the lc supply control circuit 203 is implemented by a set of circuits that provide a constant control voltage in a first phase, an initially rapidly varying and then decreasing rate of change control voltage in a second phase, and a control voltage that maintains a linear distribution of the darkness of the lc cell assembly LCD in a third phase. It should be noted that, for the conventional automatic darkening filter 10, the modularized liquid crystal cell assembly LCD thereof is generally in a form of sandwiching a positive liquid crystal plate between a polarizing plate and a polarizing plate. That is, in the case where the driving voltage is 0 (i.e., not powered on), the liquid crystal cell assembly LCD is in a bright state in a standby state; with the increase of the driving voltage, the LCD is in a dark state and the darkness value is gradually increased. In an embodiment of the present utility model, the control voltage required to drive the liquid crystal cell assembly LCD is provided by the liquid crystal power supply control circuit 203 to the liquid crystal drive circuit 204 within a certain time delay range after the arc extinguishing operation, wherein the control voltage in the first stage (i.e., the basic time delay stage) of the time delay range is greater than the control voltage in the whole second stage (i.e., the transition time delay stage) so that the darkness value in the first stage (typically between DIN8 and 15) is greater than the darkness value in the second stage (from between initial DIN8 and 15 to between DIN3 and 7), and the control voltage at the end of the second stage is greater than the control voltage in the third stage (i.e., the ramp time delay stage) so that the darkness value of the liquid crystal cell assembly LCD after entering the third stage is further reduced to approach or reach between bright state darkness (DIN 3 and 4). It should be noted that, in practical operation, it is necessary to ensure that the ending darkness in the second stage is not lower than the final bright state darkness, so that when there is an overlapping range or the same endpoint value between the two darkness, it means that the bright state of the automatic darkening filter 10 under normal standby is reached when the second stage is ended. In other words, the darkness in the bright state will be maintained throughout the third stage so that the darkness of this stage is still in a linear distribution.
Further, fig. 6 shows an alternative embodiment in which the liquid crystal power control circuit is implemented by two sets of circuits (some of the blocks in fig. 5 are omitted for clarity). To this end, the control system further comprises a changeover switch 205. In the first stage, the first lc power supply control circuit 203 1 is turned on with the switch 205 to provide a constant control voltage; and starts to switch to the second liquid crystal power supply control circuit 203 2 and switch on the switch 205 in the second phase, so that the control voltage with initial rapid change and gradual decrease of the change rate is provided by the second liquid crystal power supply control circuit 203 2; further, the second lc power supply control circuit 203 2 continues to provide the control voltage for maintaining the darkness of the LCD cell assembly in a linear distribution during the third stage. It should be noted that, the gradual or gradual change of the darkness of the liquid crystal display element by each liquid crystal power supply control circuit may be implemented by the following modes: DAC (digital to analog) conversion, PWM adjustment (pulse width modulation), RC (resistance-capacitance) discharge, and the like. For this purpose, the liquid crystal power supply control circuit of the utility model comprises at least one of a digital-to-analog conversion module, a pulse width modulation module and an RC discharge module. The control voltage adjusting principle and method are well known to those skilled in the art, and are not described herein.
Further, fig. 7 shows a general schematic of a welding mask according to the present utility model, comprising a mask body 30 and an automatic dimming system as described previously in the specification, wherein the mask body 30 is adapted to be coupled to a headgear structure (not shown) to be worn on the head of an operator. Further as shown, the auto-darkening filter 10 is mounted at the front opening of the mask body 30 such that, with the operator wearing it, the liquid crystal cell assembly LCD of the auto-darkening filter 10 is aligned with the eyes of the operator and the control system 20 is integrally mounted to the mask body 30.
The workflow of the automatic dimming system with the hybrid delay characteristic according to the present utility model will be briefly described with reference to fig. 8. Firstly, in the system standby state in S101, the working mode of the automatic dimming system is set in the mixed time delay mode through the working parameter setting unit 202, and the working parameters preset by the factory or manually input by the operator based on the actual working condition are sent to the micro control unit MCU according to the requirement, wherein the working parameters include, but are not limited to, working darkness, sensitivity, basic time delay and the like. For parameter input and display, the operation parameter setting unit 202 may preferably input the operation parameter to be adjusted by using a setting manner of a selection key and display the adjusted operation parameter via a display device in the form of an LED screen. Those skilled in the art will also envision adjusting the operating parameters described above using knobs, resistive or capacitive touch screens, and the like. From the foregoing description, it will be appreciated that for an automatic darkening filter 10 that typically employs a positive liquid crystal cell assembly, the display is in a bright state (see the leftmost portion of the schematic of FIG. 4) in the standby state to facilitate operator viewing of the workpieces to be welded and their surrounding work environment. Next, at S102, the photoelectric sensor detection unit 201 performs arc starting detection, and if the ambient light has not changed, it indicates that the operator has not started the welding operation, and returns to the initial standby state to continue arc starting detection. When arc welding occurs, the photoelectric sensor in the photoelectric sensor detection unit 201 detects the change of the ambient light, and after the change is processed by the operational amplifier, the photoelectric sensor detection unit 201 converts the detected light signal into an arcing electric signal and transmits the arcing electric signal to the micro control unit MCU. In this case, the welding process control step S103 shown in fig. 8 is entered, and the micro control unit MCU may set the darkness of the automatic darkening filter 10 accordingly according to the intensity of the detected welding arc or based on the operator' S own settings or inputs. The MCU may include a single-chip microcomputer, and when in operation, the single-chip microcomputer reads the working parameters preset or input by the user, and sends corresponding output control signals to the LCD power supply control circuit 203, so that the LCD driving circuit 204 applies corresponding control voltages to the LCD module to adjust the darkness of the welding arc light after passing through the automatic dimming filter 10, so as to protect eyes of the operator from injury (see fig. 4 for a welding uv and ir protection stage). Next, at step S104, arc extinction detection is started (i.e., whether the welding operation is ended is judged) with the photosensor detection unit 201. If the photosensor detection unit 201 does not detect a light signal indicating an arc extinction, it indicates that the welding operation has not been completed, and thus, continues to return to the previous step to repeat the normal welding process control. When the photosensor detecting unit 201 detects an optical signal indicating arc extinction, it converts the optical signal into an arc extinction electric signal and transmits the arc extinction electric signal to the micro control unit MCU. In this case, the process advances to darkness control step S105 shown in fig. 8. As described above, the micro control unit MCU at this time transmits the generated output control signal to the liquid crystal power supply control circuit 203 based on the operation parameters (including the duration, the start darkness, and the end darkness of each stage of the delay range) previously set or input via the operation parameter setting unit 202. It will be appreciated that the output control signal at this time includes information about the control voltages for driving the liquid crystal cell assembly LCD at different timings within a certain time delay range after the arc extinction operation. Further, the liquid crystal power supply control circuit 203 supplies a control voltage required for driving the liquid crystal cell assembly LCD to the liquid crystal driving circuit 204, and drives the liquid crystal cell assembly LCD via the liquid crystal driving circuit 204 so that the darkness distribution exhibited after passing through the automatic dimming filter 10 after the arc extinguishing operation has the characteristic of a mixing time delay as shown in fig. 4, and finally returns to the bright state in the standby state.
In summary, by adopting the technical scheme of the utility model, the mixed time delay design practically solves the waiting problem caused by overlong high-current bright light holding time, also solves the rapid observation requirement of rapid spot welding, and avoids the discomfort of eyes caused by excessive darkness contrast, thereby having good practical value.
It is to be understood that the foregoing description of the principles of the utility model has been presented by way of example only of the preferred embodiment. However, the present utility model is not limited to the specific structure in the above-described preferred embodiment, but various modifications can be made.
For example, in the above preferred embodiment, the process of implementing the hybrid delay function of the present utility model is described with respect to one liquid crystal power supply control circuit and switching between two liquid crystal power supply control circuits using the switch 205, respectively. However, it will be appreciated by those skilled in the art that the corresponding lc power control circuits may be provided for three different types of delay stages in the hybrid delay, so as to switch between the three lc power control circuits to implement the functionality of the present utility model.
In addition, in the schematic diagram of the optimized welding process darkness pattern shown in fig. 4 according to the preferred embodiment of the present utility model, the darkness of the entire first stage (i.e., the first darkness D 1) remains unchanged from the darkness D 0 at the time of the welding just-quenched arc. However, as will be appreciated by those skilled in the art, the magnitude of the first darkness D 1 may be manually set as desired so as to be above or below the darkness D 0 upon arc extinction.
In addition, the present utility model is illustrated and described in the preferred embodiments and figures by way of example only with respect to a single liquid crystal cell assembly. It will be appreciated by those skilled in the art that any number of modular liquid crystal cell assemblies may be provided, for example, as desired, and that a corresponding number of liquid crystal drive circuits may be used to drive different liquid crystal cell assemblies, respectively.
The above describes in detail, by means of the accompanying drawings, a possible but non-limiting embodiment of an automatic dimming system according to the present utility model and a welding mask comprising the same. Modifications and additions to the techniques and structures, and rearrangements of the features of the embodiments, as will become apparent to those skilled in the art without departing from the scope and spirit of the disclosure as set forth and defined by the following claims, are intended to be encompassed within the scope of the utility model. Accordingly, such modifications and additions as are contemplated under the teachings of the present utility model are intended to be part of this disclosure. The scope of the present disclosure is defined by the claims appended hereto and include known equivalents and equivalents not yet foreseen at the time of filing date of the present disclosure.
Claims (10)
1. An automatic darkening system for a welding mask, the automatic darkening system comprising an automatic darkening filter (10) and a control system that controls the darkness thereof, the automatic darkening filter (10) comprising a liquid crystal cell assembly (LCD), the control system comprising:
a Micro Control Unit (MCU);
A photosensor detection unit (201) electrically connected to the Micro Control Unit (MCU) for detecting and converting optical signals under the arc starting and extinguishing operations into electrical signals and transmitting the electrical signals to the Micro Control Unit (MCU);
An operating parameter setting unit (202) electrically connected to the Micro Control Unit (MCU) for transmitting operating parameters to the Micro Control Unit (MCU);
The liquid crystal power supply control circuit (203) is electrically connected with the Micro Control Unit (MCU), and the Micro Control Unit (MCU) can generate an output control signal based on the electric signal and the working parameter and send the output control signal to the liquid crystal power supply control circuit (203); and
A liquid crystal driving circuit (204) electrically connected downstream of the liquid crystal power supply control circuit (203), wherein the liquid crystal power supply control circuit (203) is capable of supplying a control voltage required to drive the liquid crystal cell assembly (LCD) to the liquid crystal driving circuit (204) based on an output control signal from the Micro Control Unit (MCU);
The liquid crystal drive circuit (204) drives the liquid crystal cell assembly (LCD) to change between a bright state and a dark state, wherein a continuous darkness curve of the liquid crystal cell assembly (LCD) is distributed in a time sequence over a time delay after an arc quenching operation as follows: in the first stage of the time delay range, the darkness is maintained unchanged; in the second stage of the time delay range, the darkness and the change rate of the darkness are decreased; and in a third phase of the time delay, the darkness maintains a linear distribution.
2. The automatic dimming system as claimed in claim 1, wherein the operation parameters are preset operation parameters when the automatic dimming system leaves a factory or manually input by an operator based on actual conditions, and the operation parameters include duration, starting darkness and ending darkness of each stage of a time delay range.
3. The automatic dimming system of claim 2, wherein the duration of the first stage is adjustable between 0 and 1000 milliseconds, the starting darkness and ending darkness of the first stage being a first darkness of the liquid crystal cell assembly (LCD) during an arc quenching operation.
4. The automatic dimming system of claim 2, wherein the duration of the second stage is adjustable between 100-300 milliseconds, the starting darkness of the second stage being a first darkness of the liquid crystal cell assembly (LCD) during an arc quenching operation, the ending darkness of the second stage being a second darkness less than the first darkness.
5. The automatic dimming system of claim 2, wherein the duration of the third stage is adjustable between 0-2 seconds, the starting darkness of the third stage is the ending darkness of the second stage, and the ending darkness of the third stage is no greater than the starting darkness of the third stage and no less than the bright state darkness of the liquid crystal cell assembly (LCD).
6. The automatic dimming system of claim 4, wherein the first darkness is between DIN8 and 15 and the second darkness is between DIN3 and 7.
7. The automatic dimming system of any one of claims 1 to 6, wherein the liquid crystal power supply control circuit comprises a first liquid crystal power supply control circuit (203 1) and a second liquid crystal power supply control circuit (203 2), the automatic dimming system further comprising a switch (205) selectively turned on with the first liquid crystal power supply control circuit (203 1) and the second liquid crystal power supply control circuit (203 2), wherein the first liquid crystal power supply control circuit (203 1) is turned on with the switch (205) to provide the driving voltage to the liquid crystal driving circuit (204) in the first phase; and the second liquid crystal power supply control circuit (203 2) is turned on with the change-over switch (205) in the second stage and the third stage to supply the driving voltage to the liquid crystal driving circuit (204).
8. The automatic dimming system of any one of claims 1 to 6, wherein the liquid crystal power supply control circuit comprises at least one of a digital-to-analog conversion module, a pulse width modulation module, and an RC discharge module.
9. The automatic dimming system of any one of claims 1 to 6, wherein the output control signal includes information about control voltages for driving a liquid crystal cell assembly (LCD) at different timings within the time delay range, the control voltage of the first stage is greater than the control voltage of the entire second stage, and the control voltage at the end of the second stage is greater than the control voltage of the third stage.
10. A welding mask, comprising: mask body (30) and an automatic dimming system according to any one of claims 1 to 9, wherein an automatic dimming filter (10) in the automatic dimming system is mounted at a front opening of the mask body (30), and a control system in the automatic dimming system is integrally mounted to the mask body (30).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323060682.9U CN221039693U (en) | 2023-11-10 | 2023-11-10 | Automatic dimming system for welding helmet and welding helmet including the same |
| PCT/CN2024/129653 WO2025098283A1 (en) | 2023-11-10 | 2024-11-04 | Auto-darkening system for welding mask and method for controlling darkness thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323060682.9U CN221039693U (en) | 2023-11-10 | 2023-11-10 | Automatic dimming system for welding helmet and welding helmet including the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221039693U true CN221039693U (en) | 2024-05-28 |
Family
ID=91134478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323060682.9U Withdrawn - After Issue CN221039693U (en) | 2023-11-10 | 2023-11-10 | Automatic dimming system for welding helmet and welding helmet including the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221039693U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117311028A (en) * | 2023-11-10 | 2023-12-29 | 泰克曼(南京)安全防护设备有限公司 | Automatic dimming system for welding mask and method for controlling its darkness |
| WO2025098283A1 (en) * | 2023-11-10 | 2025-05-15 | Tecmen Electronics Co., Ltd | Auto-darkening system for welding mask and method for controlling darkness thereof |
-
2023
- 2023-11-10 CN CN202323060682.9U patent/CN221039693U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117311028A (en) * | 2023-11-10 | 2023-12-29 | 泰克曼(南京)安全防护设备有限公司 | Automatic dimming system for welding mask and method for controlling its darkness |
| WO2025098283A1 (en) * | 2023-11-10 | 2025-05-15 | Tecmen Electronics Co., Ltd | Auto-darkening system for welding mask and method for controlling darkness thereof |
| CN117311028B (en) * | 2023-11-10 | 2026-03-17 | 泰克曼(南京)安防技术股份有限公司 | Automatic dimming system for welding masks and method for controlling their darkness |
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Address after: No.8, Huyue East Road, Longchi street, Liuhe District, Nanjing City, Jiangsu Province Patentee after: Techman (Nanjing) Security Technology Co.,Ltd. Country or region after: China Address before: No.8, Huyue East Road, Longchi street, Liuhe District, Nanjing City, Jiangsu Province Patentee before: Tecman (Nanjing) safety protection equipment Co.,Ltd. Country or region before: China |
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