Protective mask

Abstract

The utility model discloses a protective mask, which belongs to the technical field of protective equipment and comprises a shell capable of wrapping the face of a human body, a visible window is arranged on the shell corresponding to the eyes of the human body, a main filter and two auxiliary filters are mounted on the visible window, and the two auxiliary filters are respectively distributed on two sides of the main filter; the light transmittance of the main filter is variable, and the light transmittance of the main filter is automatically adjusted by a control unit mounted on the inner side of the shell; the light transmittance of the two auxiliary filters is fixed. The main filter and the two auxiliary filters are installed on the visual window, the face of the human body can be protected, the view field can be greatly widened, and welding work of an operator is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of protective equipment, and in particular relates to a protective mask. Background Art

[0002] In the manual welding process, the protective mask is one of the indispensable equipment for protecting the human face. The traditional protective mask is a handheld welding protective mask, which includes a mask shell with a low transmittance filter in the middle of the shell. A handle is connected under the shell to facilitate the operator to fit the mask on the face when using it. This welding mask has the following limitations when used:

[0003] (1) First, the use steps are cumbersome, and the mask needs to be frequently removed from the face to obtain vision.

[0004] (2) Because the filter on the mask is dark and has a fixed light transmittance, the welder's vision is interrupted, making it difficult to control the welding quality.

[0005] (3) The light during welding can easily damage the eyes.

[0006] (4) The welder uses both hands to hold the welding gun and welding cap at the same time and cannot straighten the workpiece or do other auxiliary work.

[0007] In response to the above problems, the Chinese invention patent publication number CN106344263A disclosed a high-darkness multifunctional automatic darkening welding filter on January 25, 2017, including a filter body, the filter body is composed of an ultraviolet / infrared filter, a first LCD, a second LCD, a third LCD and an optical glass sheet, the bottom side of the ultraviolet / infrared filter is connected to the optical glass sheet, the first LCD, the second LCD and the third LCD are sequentially connected to the ultraviolet / infrared filter, and the first LCD, the second LCD and the third LCD are installed on both sides of the first LCD, the second LCD and the third LCD. The input end of the control circuit is electrically connected to the external power supply, and the output end of the control circuit is electrically connected to the input interface on both sides of the first LCD, the second LCD and the third LCD. The above invention realizes that the highest dimming degree of the automatic darkening filter is 15 levels through the improvement of LCD and the adjustment of the control circuit, which meets the requirements of customers for ultra-high current welding of electric welding machines; at the same time, the product reaches a darkness level of 4 when in standby or used for grinding function, which is convenient for customers to observe the welded or polished workpiece more clearly.

[0008] The above invention patent solves the problem of frequently removing the mask during welding by making the filter transmittance variable, so that the operator can work without removing the mask. However, this will also cause a new problem of insufficient field of view. In the prior art, the problem of insufficient field of view is generally solved by enlarging the visible window and the filter size. However, as the filter area increases, there are disadvantages such as increased power consumption of the control circuit, reduced mask usage time, and increased mask production costs. Utility Model Content

[0009] 1. Problems to be eliminated

[0010] In view of the technical problems faced by variable transmittance filter masks in the prior art when expanding the field of view, such as increased power consumption of the control circuit, increased mask weight and increased mask production cost, the utility model solves the problems by arranging a main filter and a sub-filter in the visible window, with the main filter having a variable transmittance and the sub-filter having a fixed transmittance.

[0011] 2. Technical solution

[0012] In order to eliminate the above problems, the utility model adopts the following technical solutions:

[0013] A protective mask comprises a shell capable of wrapping a human face, wherein a visual window is arranged on the shell at a position corresponding to the human eye, and a main filter and two auxiliary filters are installed on the visual window, wherein the two auxiliary filters are respectively distributed on both sides of the main filter; the main filter has a variable light transmittance, and the two auxiliary filters have a fixed light transmittance.

[0014] Preferably, a control unit is installed in the protective mask for changing the transmittance of the main filter; the control unit includes an infrared light sensor arranged on the protective mask and a controller electrically connected to the infrared light sensor, and the controller changes the transmittance of the main filter accordingly after receiving the light-sensing signal sent by the infrared light sensor.

[0015] Preferably, the light sensor is located on the main filter.

[0016] Preferably, the protective mask is provided with a solar panel for supplying power to the control unit, and the solar panel is located in the visual window.

[0017] Preferably, the secondary filter is an infrared and ultraviolet protection filter.

[0018] Preferably, the visible light transmittance of the secondary filter is greater than 3%.

[0019] Preferably, a transparent protective sheet for closing the visible window is provided on the housing, and the transparent protective sheet is located directly in front of the main filter and the two auxiliary filters.

[0020] Preferably, the transparent protective sheet has a plurality of positioning holes, and the plurality of positioning holes are correspondingly engaged with the positioning pins on the shell.

[0021] Preferably, the transparent protective sheet has a plurality of anti-dropout lock holes, and the plurality of anti-dropout lock holes are correspondingly engaged in the anti-dropout lock pins on the shell.

[0022] Preferably, the visible window has a recessed continuous curved window frame to seal and accommodate the inner edge and contour of the transparent protective sheet.

[0023] 3. Beneficial effects

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] (1) The utility model has a visual window, on which a main filter and two auxiliary filters are installed. The two auxiliary filters have a high fixed light transmittance and can filter out ultraviolet rays and infrared rays. The side light of the welder's eyes can be seen through it at any time to see the left and right environment and workpieces. The technical solution of the utility model can not only play a role in protecting the human face, but also the operator can observe the situation on both sides through the two auxiliary filters, which greatly widens the field of vision and is conducive to the operator's welding work.

[0026] (2) The utility model adopts a main filter that can sense and automatically change the transmittance, and two auxiliary filters that cannot be dimmed, which not only meets the use requirements (eye and face protection) but also reduces the range of the dimmer. Compared with the main filter and the auxiliary filter both using the dimmer solution, the technical solution of the utility model greatly simplifies the control circuit and helps reduce production costs.

[0027] (3) The utility model arranges solar panels below and above the main filter, which can convert the light generated during welding into electrical energy for the control unit, thereby effectively reducing energy consumption and extending its use time.

[0028] (4) The utility model has a transparent protective sheet arranged in front of the main filter and the auxiliary filter. The transparent protective sheet can effectively prevent the main filter and the auxiliary filter from being scratched and burned by splashes during welding. The transparent protective sheet can be replaced at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the 3D structure of the protective mask;

[0030] Figure 2 It is a schematic diagram of the main structure of the protective mask;

[0031] Figure 3 It is a schematic diagram of unfolding the transparent protective sheet;

[0032] In the figure:

[0033] 1. Shell; 2. Visible window; 21. Window frame; 3. Main filter; 4. Auxiliary filter; 5. Control unit; 51. Infrared light sensor; 6. Solar window; 61. Solar panel; 7. Transparent protective sheet; 71. Positioning hole; 72. Positioning pin; 73. Anti-drop lock hole; 74. Anti-drop lock pin; 75. Contour. DETAILED DESCRIPTION

[0034] The following detailed description of the exemplary embodiments of the utility model refers to the accompanying drawings, which form a part of the description, and in which exemplary embodiments that can be implemented by the utility model are shown as examples. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to implement the utility model, it should be understood that other embodiments can be implemented and various changes can be made to the utility model without departing from the spirit and scope of the utility model. The following more detailed description of the embodiments of the utility model is not intended to limit the scope of the utility model required, but is only for illustration and does not limit the description of the characteristics and features of the utility model, so as to propose the best way to perform the utility model, and is sufficient to enable those skilled in the art to implement the utility model. Therefore, the scope of the utility model is limited only by the appended claims.

[0035] The following is a detailed description with reference to the accompanying drawings:

[0036] like Figure 1 As shown, a protective mask is used to protect the human face during welding, including a mask shell 1, the shape of the mask shell 1 corresponds to the facial features of the human body, and can cover the entire human face and neck. A visual window 2 is provided on the shell 1 facing the human eye. When in use, the operator can observe the external situation through the visual window 2. The overall size of the visual window 2 accounts for about 1 / 2 of the entire mask area, so the operator can obtain a relatively large field of view.

[0037] like Figure 2 As shown, a filter that can filter light is installed in the main viewing window. The filters are divided into a main filter 3 and a sub-filter 4. The main filter 3 mainly filters the strong light, ultraviolet rays and infrared rays entering the human eye, and the sub-filter 4 mainly filters the ultraviolet rays, infrared rays and part of the strong light irradiating the side face of the human body. The main filter 3 is located in the visual window directly opposite the human eye. The sub-filter 4 is divided into two pieces, one is located on the left side of the main filter 3, and the other is located on the right side of the main filter 3. The main filter 3 and the two sub-filters 4 together occupy the entire visual window. Therefore, the light generated during welding will be filtered by the main filter 3 or the two sub-filters 4 before entering the inside of the mask. The utility model adopts a main filter 3 and two sub-filters 4. When it is necessary to observe the situation on the left and right sides, it can be observed through the left and right sub-filters 4, so the field of vision of the welding operator can be greatly improved.

[0038] The transmittance of the main filter 3 is variable. When the main filter 3 is in use, its transmittance is changed by the control unit 5. The control unit 5 is composed of a light sensor 51 and a controller. The preferred light sensor is an infrared light sensor 51, and there are four of them. The four infrared light sensors 51 are all located at the top or bottom of the main filter 3 lens near the main filter position. The infrared light sensor 51 transmits the collected light-sensing signal to the control unit 5 through the wiring connected to the controller. After being analyzed by the control unit 5, the main filter 3 is controlled to change the light transmittance.

[0039] The main filter 3, control unit 5 and light sensor 51 device components can directly use existing products, such as the automatic darkening welding core box of model XA-1009, XA-1001F(G), XA-1011 or XA-1122E produced by a company in Changzhou. When using, install each component in the corresponding position of the mask, and then use wiring to correctly connect each component in sequence.

[0040] The protective mask is provided with a solar panel 61 for supplying power to the control unit 5, and the solar panel 61 is located in the solar window 6 in the visual window 2. In one embodiment, there are two solar panels 61, which are respectively located on the upper and lower sides of the main filter 3. During welding, strong light is irradiated on the solar panel 61, and the solar panel 61 supplies power to the control unit, thereby reducing the consumption of the protective lithium battery inside the filter box. Since the transmittance of the main filter 3 is variable, the operator does not need to repeatedly remove the mask to always see the weld and the molten pool of the workpiece being welded. During welding, the mask is exposed to strong light, and the main filter 3 automatically reduces the transmittance to adapt to the operator's welding. After welding is completed, the main filter 3 automatically increases the transmittance to allow the operator to obtain a good field of vision.

[0041] The main function of the auxiliary filter 4 is to protect the human face from long-term exposure to ultraviolet rays, infrared rays and strong light radiation. The two auxiliary filters 4 use filters with fixed transmittance and anti-ultraviolet and infrared rays. In addition, it should be noted that the two auxiliary filters 4 do not need to use the control unit 5 to control their light change like the main filter 3, which not only increases power consumption and increases the weight of the mask, but also increases the production cost and complexity of the mask. However, the two auxiliary filters 4 need to be able to prevent ultraviolet rays or infrared rays to prevent ultraviolet rays or infrared rays from irradiating the human skin and causing damage to the human skin. Therefore, the auxiliary filter 4 can meet international and domestic protection standards through optical coating. The auxiliary filter 4 has certain requirements for the transmittance of visible light, and the operator can observe the external situation through the auxiliary filter 4. Generally, the transmittance of visible light of the auxiliary filter 4 is greater than 3%, preferably about 8%.

[0042] like Figure 2 and Figure 3As shown, a transparent protective sheet 7 is also provided on the shell 1 of the mask. The transparent protective sheet 7 is made of soft transparent PC resin and can be freely bent to a certain arc. The transparent protective sheet 7 is specifically located in front of the main filter 3 and the two auxiliary filters 4 of the visual window 2, and wraps the main filter 3 and the two auxiliary filters 4 inside the shell 1. The transparent protective sheet 7 can protect the main filter 3 and the two auxiliary filters 4, and prevent welding slag or foreign matter from splashing and scratching or scalding the main filter 3 and the two auxiliary filters 4. The transparent protective sheet 7 can be detachably installed on the shell 1 and can be replaced at any time. The transparent protective sheet 7 is generally elliptical, and its specific shape and size are adapted to the outer frame of the visual window 2. The transparent protective sheet 7 has a plurality of positioning holes 71, and the plurality of positioning holes 71 are correspondingly engaged in the positioning pins 72 on the shell 1. Through the cooperation of the positioning holes 71 and the positioning pins 72, the transparent protective sheet 7 has the same curvature as the visible window 2 of the mask, ensuring that the shell 1 of the mask and the transparent protective sheet 7 are matched after installation, and no gap caused by deformation will be generated. The transparent protective sheet 7 has a plurality of anti-slip lock holes 73, a plurality of anti-slip lock holes 73 (preferably two), and a plurality of anti-slip lock holes 73 are symmetrically distributed on the transparent protective sheet 7, and are correspondingly engaged in the anti-slip lock pins 74 on the shell 1 to prevent the transparent protective sheet 7 from falling off the shell 1. The visible window 2 has a sunken continuous arc window frame 21, and the window frame 21 is used to seal and accommodate the contour 75 at the edge of the transparent protective sheet 7. After the contour 75 at the edge of the transparent protective sheet is installed in the window frame 21, the sealed packaging of the visible window 2 is realized.

[0043] The protective mask can be used in conjunction with a fan, and the fan air duct can be used to ventilate the inside of the protective mask to meet the ventilation requirements of the mask user.

[0044] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A protective mask, comprising a shell (1) capable of wrapping a human face, wherein a visible window (2) is provided on the shell (1) corresponding to a human eye, and wherein: A main filter (3) and two auxiliary filters (4) are installed on the visual window (2), and the two auxiliary filters (4) are respectively distributed on both sides of the main filter (3); The main filter (3) has a variable light transmittance, and the two auxiliary filters (4) have fixed light transmittance.

2. The protective mask according to claim 1, characterized in that: A control unit (5) is installed in the protective mask for changing the light transmittance of the main filter (3); the control unit (5) is electrically connected to a light sensor (51) arranged on the protective mask, and receives a light-sensing signal sent by the light sensor (51).

3. The protective mask according to claim 2, characterized in that: The light sensor (51) is located outside the main filter (3).

4. The protective mask according to claim 2, characterized in that: The protective mask is provided with a solar panel (61) for supplying power to the control unit (5); the solar panel (61) is located in the visual window (2).

5. The protective mask according to claim 1, characterized in that: The auxiliary filter (4) is an infrared and ultraviolet protection filter.

6. The protective mask according to claim 1, characterized in that: The visible light transmittance of the secondary filter (4) is greater than 3%.

7. The protective mask according to claim 1, characterized in that: The housing (1) is provided with a transparent protective sheet (7) for closing the visible window (2); the transparent protective sheet (7) is located directly in front of the main filter (3) and the two auxiliary filters (4).

8. The protective mask according to claim 7, characterized in that: The transparent protective sheet (7) has a plurality of positioning holes (71), and the plurality of positioning holes (71) are correspondingly engaged in positioning pins (72) on the housing (1).

9. The protective mask according to claim 7, characterized in that: The transparent protective sheet (7) has a plurality of anti-dropout locking holes (73), and the plurality of anti-dropout locking holes (73) are correspondingly engaged in the anti-dropout locking pins (74) on the housing (1).

10. The protective mask according to claim 7, characterized in that: The viewing window (2) has a recessed continuous curved window frame (21) to seal and accommodate the inner edge and contour (75) of the transparent protective sheet (7).

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