WO2022147855A1

WO2022147855A1 - Upper air duct-based air supply mechanism, head-mounted protector, and electric protection device

Info

Publication number: WO2022147855A1
Application number: PCT/CN2021/072969
Authority: WO
Inventors: 高为人
Original assignee: 常州迅安科技股份有限公司
Priority date: 2021-01-08
Filing date: 2021-01-21
Publication date: 2022-07-14
Also published as: CN112717294A; CN112717294B

Abstract

An upper air duct-based air supply mechanism, a head-mounted protector (30), and an electric protection device. The upper air duct-based air supply mechanism comprises a helmet band structure (10) and an upper air supply assembly (20). The upper air supply assembly (20) comprises an arc-shaped ventilation pipe (21); the front end of the arc-shaped ventilation pipe (21) is provided with an air outlet (21a), a bottom plate (22) provided on the bottom side of the air outlet (21a) and extending towards the air outlet direction, and a cover plate (23) detachably fixed on the bottom plate (22) and provided with an opening on the end of the air outlet direction; an air outlet cavity is formed between the cover plate (23) and the bottom plate (22), and the front end of the bottom plate (22) is flared; and an air outlet area of the air outlet cavity covers an entire face area of a wearer. By fixing the upper air supply assembly (20) on the helmet band structure (10), air input from the rear portion of the upper air duct-based air supply mechanism is blown out from the front end; and by means of the bottom plate (22) provided at the front end of the arc-shaped ventilation pipe (21) and the provision of a flow guide member (24) on the bottom plate (22), a part of the air blown to a human face is transferred to both sides of the front side of the human face, thus reducing the discomfort caused by direct blowing to the front side, and improving the degree of comfort during a wearing operation.

Description

An upper air duct air supply mechanism, headgear and electric protective equipment

technical field

The invention relates to the technical field of headgear, in particular to an upper air duct air supply mechanism, a headgear and an electric protection device.

Background technique

In the field of machining technology, especially in the fields of welding and grinding that require wearing headgear, with the improvement of occupational health and personal protection standards awareness, electric protective equipment has also been paid more and more attention. Because in a working environment with poor air quality, electric protective equipment can filter out the air that is harmful to human health, thereby reducing human injury.

In the related art, the filtered air is often fed into the headgear by a direct blowing method, so that the air flow is blown directly to the frontal area of the operator's face, thereby providing the operator with fresh air. However, the above-mentioned direct blowing method has discomfort during long-term use, especially in the eyes, mouth and nose. Long-term direct blowing can cause problems such as dry eyes, dry mouth and so on.

The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is: to provide an upper air duct air supply mechanism, a headgear and an electric protection device, so as to improve the wearing comfort of the operator.

In order to achieve the above object, the technical scheme adopted in the present invention is:

In one aspect, an upper air duct air supply mechanism is provided, including a cap strap structure and an upper air supply assembly;

The chinstrap structure includes a horizontal annular fastening chinstrap and a transverse chinstrap, the horizontal annular fastening chinstrap is used to fix the position around the wearer's head, and both ends of the transverse chinstrap are fastened to the horizontal annular shape The chin strap is connected, and is bent and arranged in a direction away from the horizontal annular compression chin strap;

The upper air supply assembly includes an arc-shaped ventilation pipe. The arc-shaped ventilation pipe is integrally arranged vertically with the horizontal hat strap. The front and rear ends of the arc-shaped ventilation pipe are connected to the horizontal annular fastening hat strap. connected, and the bottom of the arc-shaped ventilation pipe is fixedly connected with the top of the lateral chinstrap;

Wherein, the front end of the arc-shaped ventilation pipe has an air outlet, a bottom plate arranged on the bottom side of the air outlet and extending toward the air outlet direction, and a cover plate detachably fixed on the bottom plate and opened at one end of the air outlet direction, An air outlet cavity is formed between the cover plate and the bottom plate, and the front end of the bottom plate is flared, and the air outlet area of the air outlet cavity covers the entire face area of the wearer;

The bottom plate is provided with a flow guide piece, the flow guide piece is arranged at the middle position of the front end of the air outlet, and the flow guide piece has two symmetrically arranged flow guide wings, and the two flow guide wings face the bottom plate Both sides of the front end are extended, and the extension length does not exceed 1/4 of the width of the air outlet, so that most of the wind blown from the air outlet is blown toward the areas on both sides of the face.

Further, the air guide member further includes a support plate, and the support plate is fixed between the two air guide wings.

Further, a compression port is provided at the central position of the front end of the air outlet, and the compression port corresponds to the position of the support plate.

Further, it also includes two deflectors, the two deflectors are arranged at the front end of the air outlet cavity formed by the bottom plate and the cover plate, and are located on the extension line of the two deflectors. There is a space between the deflector and the two guide vanes, and the two deflectors are fixed on the bottom plate and/or the cover plate.

Further, it also includes a wind direction adjustment assembly, the wind direction adjustment assembly includes two guide plates and a drive assembly that drives the same ends of the two guide plates to approach or move away from each other, and the guide plates are arranged between the guide wings and the between the guide plates, and one end of the guide plate is hinged on the connecting line between the guide vane and the guide plate, and the driving assembly is used to drive the two guide plates to the first position and the switch between the second positions;

When the two guide plates are in the first position, the two guide plates are in a substantially vertical and parallel state, and most of the air blown out from the air outlet is blown out between the two guide plates;

When the two guide plates are in the second position, the two guide plates and their corresponding guide vanes and guide plates are on the same straight line, so as to guide most of the wind to the two sides of the air outlet cavity.

Further, the drive assembly includes a rotating member and two transmission members rotatably arranged between the two guide plates, one end of the two transmission members is rotatably connected with the rotating member, and the other end is connected with the inner side of the corresponding side guide plate. For rotational connection, the drive assembly further includes a knob that is rotatably arranged on the cover plate and is fixedly connected to the rotating member.

Further, the rotating member is also provided with an arc-shaped positioning groove, the bottom plate or the cover plate is provided with a positioning column, and the positioning column is arranged in the arc-shaped positioning groove to limit the rotation of the rotating member angle.

Further, the guide plate is provided with a gear at its hinge point, and the drive assembly is a wheel set arranged between the two guide plates, the wheel set at least includes a main tooth and a pair of gears connected with one of the gears. teeth, and the drive assembly further includes a knob that is rotatably arranged on the cover plate and is fixedly connected with the main teeth.

In another aspect, the present invention also provides a headgear, comprising the above-mentioned upper air channel air supply mechanism and a protective head cover, the protective head cover is connected to the cap strap structure of the upper air channel air supply mechanism, and the There is an inner space inside the protective hood for accommodating the wearer's head, the front end of the protective hood has a semi-open window, and the upper half of the window is communicated with the cover plate of the upper air duct air supply mechanism, so The lower half of the window is fixed with a lens.

In yet another aspect, the present invention also provides an electric protective device, comprising the above-mentioned headgear and an air filter connected to the headgear, the air filter being connected to the headgear to connect the headgear to the headgear. The filtered air is input into the headgear.

The beneficial effects of the present invention are: by fixing the upper air supply assembly on the chin strap structure, the air is input from the rear of the upper air supply mechanism and blown out from the front end, and the upper air supply assembly is fixed by the chin strap structure, and the head is also improved. The strength of wearing protective gear, through the bottom plate arranged at the front end of the arc-shaped ventilation duct and the setting of the deflector on the bottom plate, part of the air blown on the face is transferred to the positions on both sides of the front of the face, which is different from the existing one. Compared with the technology, the discomfort caused by direct blowing on the front is reduced, and the comfort level of the operator when wearing and operating is improved.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments described in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is the exploded structure schematic diagram of the upper air duct air supply mechanism in the embodiment of the present invention;

Fig. 2 is the partial enlarged view of A in Fig. 1 in the embodiment of the present invention;

3 is a schematic structural diagram of a flow guide in an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of the wind direction adjusting assembly in the embodiment of the present invention when it is closed;

5 is a schematic structural diagram of another drive assembly in the wind direction adjustment assembly in the embodiment of the present invention;

6 is a schematic diagram of the wind flow direction when the wind direction adjustment assembly is opened in an embodiment of the present invention;

7 is a schematic diagram of the wind flow when the wind direction adjustment assembly is closed when the upper air duct air supply mechanism is worn in the embodiment of the present invention;

8 is a perspective view of a headgear in an embodiment of the present invention;

9 is a side view of the headgear in the embodiment of the present invention;

10 is a schematic three-dimensional structure diagram of a head-wearing protective gear in an embodiment of the present invention;

11 is a cross-sectional view of a micro air filter in an embodiment of the present invention;

FIG. 12 is a cross-sectional view of a vibrating membrane in a microfilter according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The upper air duct air supply mechanism shown in FIGS. 1 to 7 includes a cap strap structure 10 and an upper air supply assembly 20;

The chin strap structure 10 includes a horizontal annular tightening chin strap 11 and a horizontal chin strap 12. The horizontal annular tightening chin strap 11 is used to fix the position around the wearer's head. connected, and bent and arranged in the direction away from the horizontal annular fastening cap strap 11; the cap strap structure 10 is a structure commonly used in the field, and its function is to connect the headgear or face mask connected to the cap strap structure 10 so as to be firmly fixed. on the wearer's head.

The upper air supply assembly 20 includes an arc-shaped ventilation pipe 21. The arc-shaped ventilation pipe 21 is vertically arranged with the horizontal cap strap 12 as a whole. The bottom of the air-shaped ventilation pipe 21 is fixedly connected with the top of the horizontal cap strap 12; it should be pointed out here that, as shown in FIG. It roughly fits with the top of the wearer's head; the arc-shaped ventilation pipe 21 can be made of metal or other materials such as plastic; when specifically fixing, as shown in FIG. The end adopts a fixing sleeve fixed on the rear end of the cap strap structure 10, and the rear end of the arc-shaped ventilation pipe 21 is fixed with a fastener after passing through the fixing sleeve.

The front end of the arc-shaped ventilation pipe 21 has an air outlet 21a, a bottom plate 22 arranged on the bottom side of the air outlet 21a and extending toward the air outlet direction, and a cover plate detachably fixed on the bottom plate 22 and opened at one end of the air outlet direction. 23, an air outlet cavity is formed between the cover plate 23 and the bottom plate 22, and the front end of the bottom plate 22 is flared, and the air outlet area of the air outlet cavity covers the entire face area of the wearer; The mouth is arranged to cover most areas of the front and side of the human face, and the structure is simple and easy to implement; and it should be pointed out here that the shape of the bottom plate 22 is not a straight plate, but has a certain arc from the inside to the outside, so that the The bottom plate 22 also has a certain guiding function, and the two sides of the bottom plate 22 also have slots for installing the cover plate 23. During the specific installation, the cover plate 23 has a bayonet, and the upper part of the air outlet 21a has a buckle. There is also a threaded blind hole on the top, and the installation of the cover plate 23 is more convenient and reliable through the arrangement of the slot, the buckle and the threaded blind hole.

The bottom plate 22 is provided with a deflector 24 , the deflector 24 is arranged in the middle position of the front end of the air outlet 21 a , and the deflector 24 has two symmetrically arranged deflector wings 24 a , and the two deflector wings 24a face both sides of the front end of the bottom plate 22 . It is extended and the extension length does not exceed 1/4 of the width of the air outlet 21a, so that most of the wind blown out from the air outlet 21a is blown toward the areas on both sides of the face. It should be pointed out here that, as shown in FIG. 3 , the air guide 24 can be integrally formed. With this arrangement, the fixing stability of the air guide 24 can be improved on the one hand, and the processing efficiency can also be improved on the other hand.

In the above embodiment, by fixing the upper air supply assembly 20 on the chin strap structure 10, the air input from the rear of the upper air supply mechanism is blown out from the front end, and the upper air supply assembly 20 is fixed by the chin strap structure 10. The strength of the headgear 30 is due to the bottom plate 22 provided at the front end of the arc-shaped ventilation pipe 21 and the setting of the guide member 24 on the bottom plate 22, so that a part of the air blown on the human face is transferred to both sides of the front of the human face. At the position, compared with the prior art, the discomfort caused by blowing the front face is reduced, and the comfort level of the operator when wearing and operating is improved.

On the basis of the above-mentioned embodiment, in order to improve the stability of the air guide 24, please continue to refer to FIG. 3, the air guide 24 further includes a support plate 24b, and the support plate 24b is fixed between the two guide wings 24a. Through the arrangement of the support plate 24b, on the one hand, the contact area between the flow guide 24 and the bottom plate 22 is increased when the flow guide 24 is fixed, and the strength during bonding is improved, and on the other hand, the arrangement of the support can resist the air outlet. The impact of wind flow at 21a increases the service life of the air guide 24 .

Further, in order to further improve the use reliability of the air guide 24, in the embodiment of the present invention, as shown in FIG. 1 and FIG. 2 , a compression port 21b is provided at the center of the front end of the air outlet 21a, and the compression port 21b is connected to the support plate. The position of 24b corresponds. The arrangement of the compression port 21b can reduce the amount of air blowing directly to the top of the deflector 24 to reduce the impact on the deflector 24. On the other hand, the arrangement of the compression port 21b can also improve the structural strength of the air outlet 21a. , it can also reduce noise to a certain extent.

In the embodiment of the present invention, in order not to cause excessive influence on the wind direction blowing to the central position, the length of the guide vane 24a is often set to be relatively short. As a result, part of the wind is blown in from the middle. In order to overcome this problem, in the embodiment of the present invention, as shown in FIG. 1 and FIG. The front end position inside the formed air outlet cavity is located on the extension line of the two guide wings 24a. There is a distance between the two guide plates 23a and the two guide wings 24a. The two guide plates 23a are fixed on the bottom plate 22 and 24a. / or on the cover plate 23 . It should be pointed out here that the fixing position of the deflector 23a may be fixed on the bottom plate 22 as shown in FIG. 4 , or may be fixed on the inner side of the cover plate 23 as shown in FIG. One. Through the arrangement of the deflector 23a, the direction of the wind blowing into the face of the person from the front is further adjusted, thereby improving the wearing comfort of the operator.

In the embodiment of the present invention, the wind direction adjustment function is also provided, so as to facilitate the defogging operation on the lens disposed at the front end of the face that is fogged. Specifically, in an embodiment of the present invention, as shown in FIG. 2 and FIG. 4 The wind direction adjustment assembly 25 includes two guide plates 25a and a drive assembly that drives the same ends of the two guide plates 25a to approach or move away from each other, and the guide plate 25a is arranged between the guide wings 24a and the guide plate 23a , and one end of the guide plate 25a is hinged on the connecting line between the guide wings 24a and the guide plate 23a, and the driving assembly is used to drive the two guide plates 25a to switch between the first position and the second position; here the first position As shown in Figure 2, when the two guide plates 25a are in the first position, the two guide plates 25a are in a substantially vertical and parallel state, and most of the air blown out from the air outlet 21a is blown out between the two guide plates 25a; As shown in Fig. 6, through this arrangement, the main flow of the wind can be blown from the middle part to the front part of the human face, so as to blow away the fog on the lens facing the human eye without affecting the normal observation of the operator , it should be pointed out here that most of the air blown out from the air outlet 21a is blown out from the middle part, but a small part is still blown out from both sides.

The second position is shown in Fig. 4. After the lens defogging is completed, the operator can adjust the two guide plates 25a to the second position. As shown in Fig. 7, when the two guide plates 25a are in the second position, the two guide plates 25a are in the second position. 25a and its corresponding guide vanes 24a and guide plates 23a are on the same straight line, so as to guide most of the wind out of the two sides of the wind cavity. At this time, most of the wind is blown out from both sides, and only a small part is left in the middle. Through this setting, the discomfort caused by direct blowing of the eyes, mouth and nose is reduced, and the wearing comfort is improved.

In the embodiment of the present invention, two kinds of drive assemblies for adjusting the guide plates 25a are provided, as shown in FIG. 1 and FIG. 2 , in an optional embodiment of the present invention, the drive assemblies include a rotatably arranged between the two guide plates 25a. The rotating member 25c and two transmission members 25b, one end of the two transmission members 25b is rotatably connected with the rotating member 25c, and the other end is rotatably connected with the inner side of the guide plate 25a on the corresponding side. 25c is fixedly connected to the knob 25d. 2 and 4, when the rotating member 25c is twisted to the right, the transmission member 25b on the right is pulled down, and the rotating member 25c on the left is pulled to the right, so that both guide plates 25a are pulled to the middle. Pull; in order to prevent the two transmission members 25b from being pushed in the opposite direction due to the excessive pulling distance, please continue to refer to FIG. 2, the rotating member 25c is also provided with an arc-shaped positioning groove 25c1, and the bottom plate 22 or the cover plate 23 has a positioning column for positioning The post is arranged in the arc-shaped positioning groove 25c1 to limit the rotation angle of the rotating member 25c. Through the setting of the positioning groove, the normal driving of the rotating member 25c in the forward and reverse directions is ensured;

In another optional embodiment of the present invention, as shown in FIG. 5 , the guide plate 25a is provided with a gear at its hinge point, and the driving component is a wheel set disposed between the two guide plates 25a. The wheel set at least includes a main The tooth and the auxiliary tooth connected with one of the gears, the drive assembly also includes a knob 25d which is rotatably arranged on the cover plate 23 and is fixedly connected with the main tooth. In the above two embodiments, the knobs 25d are arranged on the outside of the cover plate 23, and the wind direction can be adjusted by turning the knobs 25d, without the need for external equipment and without taking off the headgear 30, which improves the operator's safety. Ease of operation.

In the embodiment of the present invention, there is also provided a headgear 30, an upper air duct air supply mechanism and a protective hood as shown in Figs. 10 connection, there is an inner space inside the protective hood for accommodating the wearer's head, the front end of the protective hood has a semi-open window 31, the upper half of the window 31 is communicated with the cover plate 23 of the upper air duct air supply mechanism, and the window The lower half of 31 is fixed with a lens. It should be pointed out here that the headgear 30 in the embodiment of the present invention may be a semi-enclosed headgear 30, a fully enclosed headgear 30, or a face mask.

In the embodiment of the present invention, an electric protective device is also claimed, including the above-mentioned headgear 30 and an air filter (not shown in the figure) connected to the headgear 30, the air filter and the headgear The headgear 30 is connected to input the filtered air into the headgear 30 . It should be pointed out here that the air filter with aerodynamic power is the prior art, which includes a filter screen and an air suction mechanism, and the air inhaled from the outside can be sent to the inside of the headgear 30 after being filtered by the filter screen .

In the embodiment of the present invention, in order to reduce the weight of the air filter in the prior art and reduce the load bearing of the wearer, a micro air filter is also involved, as shown in FIG. 11 and FIG. It is fixed at the rear end of the arc-shaped ventilation pipe 21, including a casing connected to the rear end of the arc-shaped ventilation pipe 21, a filter screen fixed at one end of the casing for filtering air, a vibrating membrane fixed inside the casing, A ceramic piezoelectric sheet in the middle of the vibrating membrane and a driving power supply connected to the ceramic piezoelectric sheet arranged outside the casing; wherein, a hole position is opened on the vibrating membrane, the surface of the hole position facing the outside is provided with a blocking net, and the hole position is also A windshield that can swing freely is provided. When the ceramic piezoelectric sheet is energized, the vibrating membrane is driven to vibrate in a direction close to or away from the arc-shaped ventilation pipe 21. When the vibrating membrane is close to the arc-shaped ventilation duct 21, the wind shield is fixed in the hole position due to the setting of the blocking net, and the vibrating membrane cannot allow the air to pass through. Therefore, the air is forced into the arc-shaped ventilation pipe 21, and when the vibrating membrane vibrates continuously, a one-way blowing sheet is formed, so that the air is continuously blown into the upper air duct air supply mechanism.

Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Various changes and modifications fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims

An upper air duct air supply mechanism, characterized in that it comprises a cap strap structure and an upper air supply assembly;

The chinstrap structure includes a horizontal annular fastening chinstrap and a transverse chinstrap, the horizontal annular fastening chinstrap is used to fix the position around the wearer's head, and both ends of the transverse chinstrap are fastened to the horizontal annular shape The chin strap is connected, and is bent and arranged in a direction away from the horizontal annular compression chin strap;

The upper air supply assembly includes an arc-shaped ventilation pipe. The arc-shaped ventilation pipe is integrally arranged vertically with the horizontal hat strap. The front and rear ends of the arc-shaped ventilation pipe are connected to the horizontal annular fastening hat strap. connected, and the bottom of the arc-shaped ventilation pipe is fixedly connected with the top of the lateral chinstrap;

Wherein, the front end of the arc-shaped ventilation pipe has an air outlet, a bottom plate arranged on the bottom side of the air outlet and extending toward the air outlet direction, and a cover plate detachably fixed on the bottom plate and opened at one end of the air outlet direction, An air outlet cavity is formed between the cover plate and the bottom plate, and the front end of the bottom plate is flared, and the air outlet area of the air outlet cavity covers the entire face area of the wearer;

The bottom plate is provided with a flow guide piece, the flow guide piece is arranged at the middle position of the front end of the air outlet, and the flow guide piece has two symmetrically arranged flow guide wings, and the two flow guide wings face the bottom plate Both sides of the front end are extended, and the extension length does not exceed 1/4 of the width of the air outlet, so that most of the wind blown from the air outlet is blown toward the areas on both sides of the face.
The air supply mechanism of the upper air duct according to claim 1, wherein the air guide member further comprises a support plate, and the support plate is fixed between the two air guide wings.
The upper air duct air supply mechanism according to claim 2, wherein a compression port is provided at the center of the front end of the air outlet, and the compression port corresponds to the position of the support plate.
The upper air duct air supply mechanism according to any one of claims 1 to 3, characterized in that it further comprises two air guide plates, and the two air guide plates are arranged inside the air outlet cavity formed by the bottom plate and the cover plate. The front-end position is located on the extension line of the two guide vanes, there is a distance between the two guide plates and the two guide vanes, and the two guide plates are fixed on the bottom plate and/or the cover plate superior.
The upper air duct air supply mechanism according to claim 4, further comprising an air direction adjustment assembly, the air direction adjustment assembly comprising two guide plates and a drive assembly for driving the same ends of the two guide plates to approach or move away from each other, The guide plate is arranged between the guide vane and the guide plate, and one end of the guide plate is hinged on the connecting line between the guide vane and the guide plate, and the drive the assembly is used to drive the two guide plates to switch between the first position and the second position;

When the two guide plates are in the first position, the two guide plates are in a substantially vertical and parallel state, and most of the air blown out from the air outlet is blown out between the two guide plates;

When the two guide plates are in the second position, the two guide plates and their corresponding guide vanes and guide plates are on the same straight line, so as to guide most of the wind to the two sides of the air outlet cavity.
The upper air duct air supply mechanism according to claim 5, wherein the driving assembly comprises a rotating member and two transmission members rotatably arranged between the two guide plates, and one end of the two transmission members is connected to the rotating member. The other end is rotatably connected with the inner side of the guide plate on the corresponding side, and the driving assembly further includes a knob which is rotatably arranged on the cover plate and is fixedly connected with the rotating piece.
The upper air duct air supply mechanism according to claim 6, characterized in that, the rotating member is further provided with an arc-shaped positioning groove, the bottom plate or the cover plate is provided with a positioning column, and the positioning column is arranged on the arc In the shape positioning groove, it is used to limit the rotation angle of the rotating member.
The upper air duct air supply mechanism according to claim 5, wherein the guide plate is provided with a gear at its hinge point, the driving component is a wheel set disposed between the two guide plates, and the The wheel set at least includes a main tooth and an auxiliary tooth connected with one of the gears, and the driving assembly further includes a knob rotatably arranged on the cover plate and fixedly connected with the main tooth.
A headgear, characterized in that it comprises the upper air duct air supply mechanism and a protective hood according to any one of claims 1 to 8, the protective hood and the upper air duct air supply mechanism. The headband is structurally connected, the protective hood has an inner space for accommodating the wearer's head, the front end of the protective hood has a semi-open window, and the upper half of the window is supplied with the upper air duct The cover plate of the mechanism is communicated, and the lower half of the window is fixed with a lens.
An electric protective device, characterized in that it comprises the headgear according to claim 9 and an air filter connected with the headgear, wherein the air filter is connected with the headgear, to input the filtered air into the headgear.