Abstract: A method of controlling shade of light valve for auto darkening filter includes: controlling the current shade of the light valve at a first shade, continuously detecting a welding arc signal until it is detected; controlling the first shade of the light valve to change to a target shade, and maintaining the target shade for welding work until the welding arc signal is interrupted; controlling the light valve to transition from the target shade to the first shade within a time period T2, wherein at least one intermediate shade is passed during the transition. For the conventional ADF, after the welding arc signal disappears, the control circuit immediately switches the light valve from the target shade to the light state shade. The switch of the light valve from the target shade to the light state shade occurs instantaneously, therefore the user may feel dazzling, causing damage to vision.

Abstract: An air supply mechanism with lower air duct, a headgear and an electric protective equipment are disclosed. The air supply mechanism with lower air duct includes: an air inlet mask, the front of the air inlet mask being raised in an arc shape and the back of the air inlet mask being arranged to fit to the human face, the air inlet mask including a first ventilation structure and a second ventilation structure connecting the front and back; an air supply pipe fixed on one side of the air inlet mask and in communication with the first ventilation structure and the second ventilation structure to supply air to the front of the air inlet mask; and a filter screen fixedly covering the first ventilation structure to filter the air entering the first ventilation structure from the front of the air inlet mask.

Abstract: A near-eye display module includes a fixed base connected to the front end of a headgear, and an imaging module housing connected to the fixed base and provided with an imaging lens on the bottom thereof. The imaging module housing is provided with a projection component inside, the projection component is configured to project text and graphic information indicating the working state of the filter and further configured to display text and graphic information of the working state of the welding machine and other equipment communicating with it. The projection component is configured to project an image toward the imaging lens and is within the observation range of one eye of the wearer. With the structure in which the near-eye display module is fixed on the headgear, the operator can clearly see the adjusted parameters and operating parameters, and the influence on the operator's line of sight is reduced.

Abstract: An automatic darkening filter with adaptive parameter adjustment includes: a welding arc intensity detection unit configured to provide a first signal for determining the welding arc intensity; a solar power supply module configured to provide electric energy for the welding arc intensity detection unit and provide a second signal for determining the ambient light intensity; and a CPU and a light valve, the CPU being configured to calculate a difference between the welding arc intensity and the ambient light intensity based on the first and second signals, and control the scale number of the light valve based on the difference. The automatic darkening filter can realize the automatic adjustment of the scale number, and in the adjustment process, the welding arc intensity signal can be revised based on the ambient light intensity, which can effectively ensure the accuracy of the final determination of the scale number.

Abstract: An automatic darkening filter with adaptive parameter adjustment includes: a welding arc intensity detection unit configured to provide a first signal for determining the welding arc intensity; a solar power supply module configured to provide electric energy for the welding arc intensity detection unit and provide a second signal for determining the ambient light intensity; and a CPU and a light valve, the CPU being configured to calculate a difference between the welding arc intensity and the ambient light intensity based on the first and second signals, and control the scale number of the light valve based on the difference. The automatic darkening filter can realize the automatic adjustment of the scale number, and in the adjustment process, the welding arc intensity signal can be revised based on the ambient light intensity, which can effectively ensure the accuracy of the final determination of the scale number.

Abstract: An air supply mechanism with lower air duct, a headgear and an electric protective equipment are disclosed. The air supply mechanism with lower air duct includes: an air inlet mask, the front of the air inlet mask being raised in an arc shape and the back of the air inlet mask being arranged to fit to the human face, the air inlet mask including a first ventilation structure and a second ventilation structure connecting the front and back; an air supply pipe fixed on one side of the air inlet mask and in communication with the first ventilation structure and the second ventilation structure to supply air to the front of the air inlet mask; and a filter screen fixedly covering the first ventilation structure to filter the air entering the first ventilation structure from the front of the air inlet mask.

Abstract: A near-eye display module includes a fixed base connected to the front end of a headgear, and an imaging module housing connected to the fixed base and provided with an imaging lens on the bottom thereof. The imaging module housing is provided with a projection component inside, the projection component is configured to project text and graphic information indicating the working state of the filter and further configured to display text and graphic information of the working state of the welding machine and other equipment communicating with it. The projection component is configured to project an image toward the imaging lens and is within the observation range of one eye of the wearer. With the structure in which the near-eye display module is fixed on the headgear, the operator can clearly see the adjusted parameters and operating parameters, and the influence on the operator's line of sight is reduced.