A mine-used intrinsically safe intelligent dustproof mask of feeling type

Abstract

The application discloses a mining intrinsically safe intelligent breath-sensing type dust mask, and relates to the technical field of dust masks, which comprises a mask main body, a connecting pipe, a filtering mechanism and an air inlet mechanism. The connecting pipe is arranged in a corrugated pipe structure between the mask main body and the filtering mechanism. One end of the connecting pipe is fixedly connected to the inner chamber of the mask main body. The mask forms negative pressure in the cavity by relying on the human body's inhalation action, drives the axial sliding of the sliding sleeve in the first filtering pipe, drives the first magnetic ring to overcome the magnetic repulsion of the second magnetic ring to move upwards, and makes the sliding sleeve side wall communication hole realize flow passage conduction. The air inlet mechanism actively sends air, forces the external airflow to pass through the filter element to complete purification and then enters the inside of the mask, and effectively reduces the breathing ventilation resistance. When the human body stops inhaling, the magnetic repulsion of the first magnetic ring and the second magnetic ring drives the sliding sleeve to reset, the communication hole and the flow passage are mutually dislocated and cut off the air path, the filter element temporarily stops the ventilation work, reduces the filter element loss, and effectively prolongs the service life of the filter element.

Description

Technical Field

[0001] This invention relates to the field of dust mask technology, specifically to an intrinsically safe intelligent breathable dust mask for mining. Background Technology

[0002] The underground working environment in mines is complex, with a large amount of mineral dust permeating the work space. Long-term inhalation of dust can easily lead to occupational diseases such as pneumoconiosis. Therefore, dust masks are essential personal protective equipment for underground workers. Currently, most conventional mining dust masks on the market use a pure negative pressure breathing structure, relying entirely on the air pressure difference created by the human body's own breathing to complete air intake and exhaust. As the filter element inside the mask is used continuously, the pores of the filter element will gradually become blocked by dust, and the airflow resistance will continue to increase. This significantly increases the breathing burden on workers, and prolonged wear can easily cause discomfort such as chest tightness and shortness of breath, seriously affecting work efficiency and wearing comfort.

[0003] Meanwhile, most existing mining dust masks only have a single filtration channel. When the filter becomes clogged, emergency ventilation and temporary filtration are impossible. Workers often cannot detect filter failure in time, and failure to replace the filter promptly leads to a significant decrease in dust protection, allowing dust to directly enter the respiratory tract and posing a major health and safety hazard. Furthermore, traditional dust mask filtration components have a single function; the filter is constantly in a ventilation state, resulting in rapid filter wear and a short lifespan, increasing the frequency of replacement and the cost of protective equipment.

[0004] Furthermore, conventional mining dust masks lack automatic detection and alert mechanisms for filter clogging. Relying on manual visual inspection of the filter is not only cumbersome but also makes it difficult to accurately assess the degree of clogging, failing to promptly remind workers to replace the filter. This makes it difficult to meet the inherent safety and intelligent protection requirements of underground mining. To address these shortcomings of existing technologies, there is an urgent need for a mining dust mask that can reduce breathing resistance, extend filter lifespan, and possess emergency filtration and intelligent filter malfunction alert functions. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an intrinsically safe intelligent breathable dust mask for mining, solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an intrinsically safe intelligent breathable dust mask for mining, comprising a mask body, a connecting tube, a filter mechanism, and an air intake mechanism. The connecting tube is arranged in a corrugated tubular structure between the mask body and the filter mechanism. One end of the connecting tube is fixedly connected to the inner cavity of the mask body, and the other end of the connecting tube is fixedly connected to the upper end face of the filter mechanism. The air intake mechanism is movably assembled at the bottom of the filter mechanism. The mask body, connecting tube, filter mechanism, and air intake mechanism are sequentially connected and assembled into an integrated structure.

[0007] Preferably, the filtration mechanism includes a first filter tube, which is arranged side-by-side with a second filter tube. The connecting port is integrally formed at the top of the first filter tube and seals with the end of the connecting tube. A columnar filter element can be detachably installed in the hollow cavity of both the first and second filter tubes. This dual-filter tube parallel structure allows for switching between main and backup filtration channels. The detachable filter element design facilitates future replacement and maintenance. The overall sealed connection structure effectively prevents leakage of unfiltered dust, improving overall dustproof reliability.

[0008] Preferably, the sliding sleeve is coaxially fitted within the internal cavity of the first filter tube and can slide freely along the axial direction of the first filter tube. The connecting holes are evenly distributed circumferentially on the side wall of the sliding sleeve. The first magnetic ring is tightly fixed to the outer circumferential side wall of the sliding sleeve, and the second magnetic ring is fixedly embedded in the inner side wall of the first filter tube. The second magnetic ring and the first magnetic ring are vertically aligned. Automatic sliding of the sliding sleeve is achieved by relying on the negative pressure of breathing combined with the repulsive force of the magnetic rings, completing the dynamic control of the airway opening and closing. The structure is highly sensitive and requires no additional electrical control components, meeting the inherent safety requirements for mining applications. Simultaneously, the filtration channel can be started and stopped according to the breathing status.

[0009] Preferably, a pressure relief hole is provided through the side wall of the first filter tube. The pressure relief hole is arranged radially along the tube wall, and its two ends are respectively connected to the external space of the first filter tube and the internal hollow cavity of the first filter tube. The pressure relief hole can balance the air pressure inside and outside the filter tube, avoid abnormal pressure in the cavity causing the sliding sleeve to jam or malfunction, ensure smooth sliding of the sliding sleeve, and improve the overall operational stability of the device.

[0010] Preferably, the air intake mechanism includes a rotating base, an air intake fan, a battery compartment, and a connector. The air intake fan and battery compartment are both fixedly embedded inside the rotating base. The connector is located between the rotating base and the filter mechanism. The rotating base is rotatably connected to the bottom end face of the filter mechanism via the connector. The rotary installation structure allows for flexible switching of the air intake fan's working position. The integrated layout of the battery compartment provides neat wiring. The overall rotary connection method is simple in structure, easy to assemble and disassemble, and adaptable to complex downhole operating scenarios.

[0011] Preferably, the upper end face of the rotating base is provided with an independent first air inlet groove and a second air inlet groove. The opening of the first air inlet groove is vertically opposite to the bottom opening of the first filter tube, and the opening of the second air inlet groove is vertically opposite to the bottom opening of the second filter tube. The two sets of independent air inlet grooves correspond to two filter channels respectively, ensuring precise airflow guidance and stable airflow into the corresponding filter tube, effectively preventing airflow cross-flow and ensuring the filtration and air delivery effect.

[0012] Preferably, a valve plate, a spring, and a pressure sensor are sequentially arranged in the internal cavity of the rotating seat corresponding to the airflow channel position of the air inlet slot. The valve plate movably blocks the channel opening of the second air inlet slot, one end of the spring abuts against the bottom of the valve plate, and the other end of the spring is fitted and installed against the outside of the pressure sensor. The valve plate, spring, and pressure sensor form a linked detection structure, which can detect the blockage status of the main filter element in real time and output a signal to realize automatic monitoring and early warning of filter element failure, reminding operators to replace the filter element in time.

[0013] Preferably, an inlet valve and an outlet valve are fixedly installed on the surface of the mask body, respectively. Both the inlet and outlet valves are connected to the internal cavity of the mask body. A locking buckle is installed at the connection point where the mask body and the connecting tube meet. The inlet and outlet valves allow for unidirectional airflow, preventing backflow of exhaled air. The buckle structure strengthens the connection between the mask and the connecting tube, preventing the interface from loosening during use and improving the sealing and secureness of the fit.

[0014] This invention provides an intrinsically safe intelligent breathable dust mask for mining. It has the following beneficial effects: (1) This mask relies on the negative pressure generated inside the cavity by the human body's inhalation action to drive the sliding sleeve inside the first filter tube to slide axially, causing the first magnetic ring to overcome the magnetic repulsion of the second magnetic ring and move upward, so that the connecting hole on the side wall of the sliding sleeve can realize the flow channel; the air intake mechanism actively delivers air, forcing the external airflow to flow through the filter element to complete the purification before entering the mask, effectively reducing breathing resistance. When the human body stops inhaling, the magnetic repulsion of the first and second magnetic rings drives the sliding sleeve to reset, the connecting hole and the flow channel are misaligned and cut off the air path, the filter element stops the ventilation operation, reduces filter element wear, and effectively extends the service life of the filter element; (2) When the filter element in the first filter tube becomes clogged and fails, the negative pressure generated by the intake air can open the valve plate channel corresponding to the second filter tube, allowing the filter element in the second filter tube to perform emergency filtration and ensure continuous protection. The valve plate is lifted by the negative pressure and compresses the spring, triggering the pressure sensor to output a detection signal, which, together with the alarm device, realizes intelligent early warning of filter element blockage, reminding personnel to replace the filter element in time. The rotating seat of the intake mechanism is rotatably connected to the filter tube, which can switch the working position of the intake fan to achieve auxiliary air intake; at the same time, the rotating seat is fixed by the magnetic attraction structure, improving the stability of the device operation. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the overall appearance structure of the present invention; Figure 2 is a schematic diagram of the main structure of the mask of the present invention; Figure 3 is a schematic diagram of the internal cross-sectional structure of the air intake mechanism of the present invention; Figure 4 is a side view of the assembled state of the filter mechanism and the air intake mechanism of the present invention. Figure 5 is a partial cross-sectional view of the sliding sleeve, magnetic ring and connecting hole inside the first filter tube of the present invention. Figure 6 is a schematic diagram of the arrangement structure of the first filter tube and the second filter tube of the present invention; Figure 7 is an enlarged schematic diagram of the internal sensing and valve control components of the intake mechanism of the present invention.

[0016] In the diagram, 1. Mask body; 2. Connecting tube; 3. Buckle; 4. Filtering mechanism; 401. First filter tube; 402. Second filter tube; 403. Connecting port; 404. Filter element; 405. Connecting hole; 406. Sliding sleeve; 407. First magnetic ring; 408. Second magnetic ring; 409. Pressure relief hole; 5. Air intake mechanism; 501. Rotating seat; 502. First air intake slot; 503. Second air intake slot; 504. Battery compartment; 505. Connector; 506. Air intake fan; 507. Pressure sensor; 508. Valve plate; 509. Spring; 6. Air intake valve; 7. Air outlet valve. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1: Please see Figure 1-7This invention provides a technical solution: an intrinsically safe intelligent breathable dust mask for mining, comprising a mask body 1, a connecting pipe 2, a filter mechanism 4, and an air intake mechanism 5. The connecting pipe 2 is arranged in a corrugated tubular structure between the mask body 1 and the filter mechanism 4. One end of the connecting pipe 2 is fixedly connected to the inner cavity of the mask body 1, and the other end is fixedly connected to the upper end face of the filter mechanism 4. The air intake mechanism 5 is movably assembled at the bottom of the filter mechanism 4. The mask body 1, connecting pipe 2, filter mechanism 4, and air intake mechanism 5 are sequentially connected and assembled into an integral structure. The filter mechanism 4 includes a first filter pipe 401, which is arranged in parallel with a second filter pipe 402. A connecting port 403 is integrally formed at the top of the first filter pipe 401 and connected to the connecting pipe. The two ends are sealed and connected. Columnar filter elements 404 can be detachably installed in the hollow cavities of both the first filter tube 401 and the second filter tube 402. A sliding sleeve 406 is coaxially sleeved in the hollow cavity of the first filter tube 401 and can slide freely along the axial direction of the first filter tube 401. A connecting hole 405 is evenly opened on the side wall of the sliding sleeve 406 in the circumferential direction. A first magnetic ring 407 is tightly fixed on the outer circular side wall of the sliding sleeve 406. A second magnetic ring 408 is fixedly embedded in the inner side wall of the first filter tube 401. The second magnetic ring 408 and the first magnetic ring 407 are vertically aligned. A pressure relief hole 409 is opened through the side wall of the first filter tube 401. The pressure relief hole 409 is arranged radially along the tube wall. The two ends of the pressure relief hole 409 are respectively connected to the external space of the first filter tube 401 and the hollow cavity inside the first filter tube 401. In this embodiment, when the mask is in use, air is drawn through the connecting pipe 2 and connected to the connection port 403 inside the filter mechanism 4 during inhalation. This creates a negative pressure in the cavity at the top of the first filter tube 401. Under this negative pressure, the sliding sleeve 406 moves upward. Simultaneously, the sliding sleeve 406 moves the first magnetic ring 407 upward. The upward movement of the first magnetic ring 407 overcomes the repulsive force between the second magnetic ring 408 above it. This allows the sliding sleeve 406 to slide up and down, aligning the grooves on its surface with the connecting hole 405. This connects the cavity at the top of the first filter tube 401 with the cavity at the bottom where the filter element 404 is placed. Under the action of the air intake mechanism 5, external air is forced into the first filter tube 401, passing through the filter element 404 and then through the connecting hole 405 into the first filter. The filter tube 401 is located in the cavity at the top, allowing fresh air to be drawn into the mask body 1 and then discharged through the exhaust valve. Under the action of the air intake mechanism 5, external air can be actively drawn into the filter element 404 for filtration, greatly reducing breathing resistance and preventing the filter element from accumulating impurities and causing breathing difficulties over time. When not inhaling, the repulsive force between the first magnetic ring 407 and the second magnetic ring 408 can push the sliding sleeve 406 to reset, allowing the sliding sleeve 406 to move up and down through the connecting hole 405 on its surface, thus disconnecting the connecting tube 2 from the channel inside the first filter tube 401. This prevents external air from being actively blown into the first filter tube 401 under the action of the air intake mechanism 5, thereby reducing the frequency of use of the filter element 404 inside the first filter tube 401 and extending its service life.

[0019] Example 2: Please see Figure 1-7This invention provides a technical solution: the air intake mechanism 5 includes a rotating base 501, an air intake fan 506, a battery compartment 504, and a connector 505. The air intake fan 506 and the battery compartment 504 are both fixedly embedded inside the body of the rotating base 501. The connector 505 is disposed between the rotating base 501 and the filter mechanism 4. The rotating base 501 is rotatably connected to the bottom end face of the filter mechanism 4 via the connector 505. The upper end face of the rotating base 501 is respectively provided with an independent first air intake groove 502 and a second air intake groove 503. The opening position of the first air intake groove 502 is vertically opposite to the bottom opening of the first filter tube 401, and the opening position of the second air intake groove 503 is vertically opposite to the bottom opening of the first filter tube 401. The bottom opening of the second filter tube 402 is positioned vertically opposite to the bottom opening of the filter tube 402. In the internal cavity of the rotating seat 501, a valve plate 508, a spring 509, and a pressure sensor 507 are sequentially arranged at the airflow channel position corresponding to the air inlet slot. The valve plate 508 is movably blocked at the channel opening of the second air inlet slot 503. One end of the spring 509 abuts against the bottom of the valve plate 508, and the other end of the spring 509 is attached to the outside of the pressure sensor 507. An air inlet valve 6 and an air outlet valve 7 are fixedly installed on the surface of the mask body 1. Both the air inlet valve 6 and the air outlet valve 7 are connected to the internal cavity of the mask body 1. A buckle 3 for locking and fixing is installed at the connection position where the mask body 1 and the connecting tube 2 meet. In this embodiment, when the filter element 404 inside the first filter tube 401 is blocked, a negative pressure is generated inside the second filter tube 402, which is connected to the first filter tube 401, during air intake. This negative pressure then lifts the valve plate 508 inside the slot at the other end of the rotating seat 501, allowing outside air to enter the rotating seat 501. The air then enters the second filter tube 402 through the slot aligned with the bottom of the second filter tube 402, where the filter element 404 provides temporary filtration. Furthermore, when the valve plate 508 is lifted, it compresses the spring 509 at the top, thus... 08 will trigger the pressure sensor 507 on the top, so that the alarm installed inside the rotating seat receives the signal fed back by the pressure sensor 507, thereby replacing the filter element 404 inside the first filter tube in time. The connection between the rotating seat 501 and the first filter tube 401 and the second filter tube 402 is rotatably connected. By rotating the rotating seat, the intake fan 506 can be rotated from the bottom of the first filter tube 401 to the bottom of the second filter tube 402, thereby playing a role in assisting air intake at the bottom of the first filter tube 401. At the same time, a magnetic ring is embedded on the surface of the rotating seat, which is aligned with the first filter tube 401 and the second filter tube 402, so that the rotating seat 501 can be fixed.

[0020] Working principle: This intrinsically safe intelligent breathable dust mask for mining relies on the coordinated operation of air pressure changes generated by human respiration, magnetic repulsion, mechanical valve control, and sensor detection structure. Combined with an active air supply mechanism, it achieves intelligent ventilation, graded filtration, 404 filter status monitoring, and emergency protection. The overall operation process is as follows: When a worker wears a mask and inhales, a negative pressure is created inside the mask body 1. This negative pressure is transmitted through the connecting pipe 2 and the connecting port 403 to the top cavity of the first filter tube 401. The negative pressure inside the cavity pulls the sliding sleeve 406 to slide axially upward along the inner wall of the first filter tube 401. The sliding sleeve 406 drives the outer first magnetic ring 407 to move upward synchronously, gradually overcoming the magnetic repulsion force generated by the upper second magnetic ring 408, until the connecting hole 405 on the side wall of the sliding sleeve 406 is aligned with the internal flow channel of the first filter tube 401, and the upper and lower cavities of the first filter tube 401 are connected. At this time, the intake fan 506 of the intake mechanism 5 operates, and outside air is sent into the first filter tube 401 through the first intake slot 502 on the rotating seat 501. The airflow passes through the filter element 404 from top to bottom to complete dust filtration. The purified air enters the mask body 1 through the connecting hole 405, the top cavity of the first filter tube 401, and the connecting pipe 2 for the worker to breathe. The active air delivery system significantly reduces ventilation resistance caused by spontaneous breathing, improving wearing comfort.

[0021] When the operator stops inhaling and begins exhaling, the negative pressure inside the mask and the first filter tube 401 disappears. The magnetic repulsion between the first magnetic ring 407 and the second magnetic ring 408 pushes the sliding sleeve 406 downwards to reset. The connecting hole 405 on the side wall of the sliding sleeve 406 is misaligned with the internal flow channel, and the air passage inside the first filter tube 401 is cut off. The airflow from the intake fan 506 cannot enter the first filter tube 401, and the filter element 404 stops working, effectively reducing the working time and dust accumulation of the filter element 404 and extending its overall service life. At the same time, the exhaust valve 7 on the mask body 1 opens, and the exhaled exhaust gas is directly discharged. The pressure relief hole 409 on the side wall of the first filter tube 401 can balance the air pressure inside and outside the tube in real time, preventing pressure imbalance from causing the sliding sleeve 406 to jam and ensuring smooth and reliable reciprocating sliding motion of the sliding sleeve 406.

[0022] During long-term use, if the filter element 404 inside the first filter tube 401 becomes completely clogged with dust, the airflow through the main filtration channel will be obstructed. The negative pressure generated by the inhalation of personnel will act on the backup second filter tube 402. This negative pressure will lift the valve plate 508 at the second air inlet slot 503, compressing the bottom spring 509 and opening the passage of the second air inlet slot 503. Outside air will then enter the second filter tube 402 through the second air inlet slot 503 and undergo emergency filtration by the internal filter element 404, ensuring the mask continues to provide dust protection. The displacement of the valve plate 508 under pressure will trigger the pressure sensor 507 below. The sensor will transmit a detection signal to the alarm component, triggering an intelligent alarm for filter element 404 blockage, reminding personnel to replace the failed filter element 404 inside the first filter tube 401 in a timely manner.

[0023] Furthermore, the rotating seat 501 of the air intake mechanism 5 is rotatably connected to the bottom of the filter mechanism 4 via a connector 505. Operators can rotate the rotating seat 501 according to usage needs to switch the air intake fan 506 to the bottom of the second filter tube 402, achieving flexible adjustment of the air supply position. A magnetic structure can be used to position and fix the rotated seat 501, preventing displacement during use and ensuring stable operation of the air supply and filtration system. The entire structure relies on mechanical linkage and simple sensing to achieve breath control, dual-path filtration, and status self-checking. The structure is safe and reliable, meeting the inherent safety standards for use in underground mines.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0025] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A mining intrinsically safe intelligent breathable dust mask, characterized in that: The mask includes a main body 1, a connecting tube 2, a filter mechanism 4, and an air intake mechanism 5. The connecting tube 2 is arranged in a corrugated tubular structure between the main body 1 and the filter mechanism 4. One end of the connecting tube 2 is fixedly connected to the inner cavity of the main body 1, and the other end of the connecting tube 2 is fixedly connected to the upper end face of the filter mechanism 4. The air intake mechanism 5 is movably assembled at the bottom of the filter mechanism 4. The main body 1, the connecting tube 2, the filter mechanism 4, and the air intake mechanism 5 are sequentially connected and assembled into a single structure.

2. The intrinsically safe intelligent breathable dust mask for mining as described in claim 1, characterized in that: The filtration mechanism 4 includes a first filter tube 401, which is arranged in parallel with a second filter tube 402. The connection port 403 is integrally formed at the top of the first filter tube 401 and is sealed and connected to the end of the connection tube 2. A columnar filter element 404 can be detachably installed in the hollow cavity inside the first filter tube 401 and the second filter tube 402.

3. The intrinsically safe intelligent breathable dust mask for mining as described in claim 2, characterized in that: The sliding sleeve 406 is coaxially sleeved in the internal cavity of the first filter tube 401 and can slide freely along the axial direction of the first filter tube 401. The connecting hole 405 is evenly opened on the side wall of the sliding sleeve 406 in the circumferential direction. The first magnetic ring 407 is tightly fixed on the outer circular side wall of the sliding sleeve 406. The second magnetic ring 408 is fixedly embedded on the inner side wall of the first filter tube 401. The second magnetic ring 408 and the first magnetic ring 407 are arranged vertically opposite each other.

4. The intrinsically safe intelligent breathable dust mask for mining as described in claim 3, characterized in that: A pressure relief hole 409 is provided through the side wall of the first filter tube 401. The pressure relief hole 409 is arranged radially along the tube wall, and the two ends of the pressure relief hole 409 are respectively connected to the external space of the first filter tube 401 and the internal hollow cavity of the first filter tube 401.

5. The intrinsically safe intelligent breathable dust mask for mining as described in claim 1, characterized in that: The air intake mechanism 5 includes a rotating base 501, an air intake fan 506, a battery compartment 504, and a connector 505. The air intake fan 506 and the battery compartment 504 are both fixedly embedded inside the body of the rotating base 501. The connector 505 is disposed between the rotating base 501 and the filter mechanism 4. The rotating base 501 is rotatably connected to the bottom end face of the filter mechanism 4 through the connector 505.

6. The intrinsically safe intelligent breathable dust mask for mining as described in claim 5, characterized in that: The upper end face of the rotating seat 501 is provided with a first air inlet groove 502 and a second air inlet groove 503, which are independent of each other. The opening position of the first air inlet groove 502 is vertically opposite to the bottom opening of the first filter tube 401, and the opening position of the second air inlet groove 503 is vertically opposite to the bottom opening of the second filter tube 402.

7. The intrinsically safe intelligent breathable dust mask for mining as described in claim 5, characterized in that: In the internal cavity of the rotating seat 501, a valve plate 508, a spring 509, and a pressure sensor 507 are sequentially arranged at the airflow channel position corresponding to the air inlet slot. The valve plate 508 is movably blocked at the channel opening of the second air inlet slot 503. One end of the spring 509 abuts against the bottom of the valve plate 508, and the other end of the spring 509 is attached to the outside of the pressure sensor 507.

8. The intrinsically safe intelligent breathable dust mask for mining as described in claim 1, characterized in that: An air inlet valve 6 and an air outlet valve 7 are fixedly installed on the surface of the mask body 1. The air inlet valve 6 and the air outlet valve 7 are connected to the internal cavity of the mask body 1. A buckle 3 for locking and fixing is installed at the connection position where the mask body 1 and the connecting tube 2 meet.

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