Coal bunker air flow automatic blocking control method and heavy control type air flow automatic blocking control system

Abstract

The application discloses a kind of coal bunker wind flow automatic blocking control method and heavy control type wind flow automatic blocking control system, and wind flow in coal bunker is automatically turned on and off by heavy control type wind flow automatic blocking control system, under the action of adjustable counterweight, realize the closure of coal bunker lower end port bunker door and coal bunker wall, reach the effect of blocking wind flow in coal bunker.The application realizes automatic on-off wind flow in coal bunker by automatic opening and closing of bunker door, avoids gas abnormality or gas overrun risk of methane sensor existing in upper mouth of coal bunker, and avoids short circuit of wind flow at coal bunker to cause no wind or slight wind phenomenon in other related mining working face, effectively ensures the stability of mine ventilation system, realizes mine safety production;By connecting travel switch, PLC controller and other automation systems, effectively reduce the input of post worker at coal bunker, reduce the input of post worker per shift under the premise of intrinsic safety, further avoid a series of risks caused by the lack of responsibility or lack of experience of some workers, improve the safety management level of mine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine production safety, in particular to a coal bunker air flow automatic blocking and control method and a heavy control type air flow automatic blocking and control system. BACKGROUND

[0002] Stable mine ventilation system and scientific and reasonable ventilation are the basic guarantee for ensuring mine safety production. The coal flow transportation system often uses the coal chute as a necessary link for transfer. The relevant safety regulations clearly stipulate that all coal bunkers and coal chutes in the underground mine should maintain a certain amount of stored coal and should not be empty. Although many assessment mechanisms are developed for the post workers, because of the limitation of the comprehensive business quality and business ability of the workers, it is unavoidable that the stored coal in the coal chute is empty, which causes the air flow in the coal bunker to pass through the lower port to the upper port, the methane accumulated in the coal bunker is blown out by the short-circuit air flow, causing gas anomaly or over-limit at the location, and causing air flow short circuit in multiple related areas, air flow suddenly decreases or no air or slight air phenomenon in multiple related operation locations, gas cannot be effectively diluted and removed, gas anomaly or gas over-limit occurs, which seriously affects the safety production of the mine. SUMMARY

[0003] The present application provides a coal bunker air flow automatic blocking and control method and a heavy control type air flow automatic blocking and control system, which automatically turns on and off the air flow in the coal bunker, avoids the risk of gas anomaly or over-limit, ensures the stability of the ventilation system, and realizes safe mine production; reduces manual input and avoids safety risks caused by improper operation of some workers.

[0004] Technical scheme: In order to achieve the above-mentioned purpose, the coal bunker air flow automatic blocking and control method and the heavy control type air flow automatic blocking and control system automatically turn on and off the air flow in the coal bunker. Under the action of the adjustable counterweight assembly, the closure of the bunker door at the lower end of the coal bunker and the coal bunker wall is realized, the effect of blocking the air flow in the coal bunker is achieved, and the method is applied to actual mine operation, and specifically includes the following working steps:

[0005] Step I: the mining working face starts to discharge coal, the bunker door is automatically opened, and the coal feeder is started and continuously works: after the mining working face starts to discharge coal, a small amount of coal enters the bottom of the coal bunker through the pilot coal chute, when the weight of the coal stored in the coal bunker exceeds the weight of the counterweight, the bunker door is automatically opened, during which the travel switch is touched, the travel switch is powered on, the normally open terminal in the travel switch becomes a normally closed terminal, and the PLC controller supplies power to the vacuum electromagnetic starter control system loop, the weak current controls the strong current principle, the power supply loop of the vacuum electromagnetic starter is closed to supply power to the coal feeder, so that the coal feeder continuously works;

[0006] Step II, the coal mining face stops coal production, the door is automatically closed to block the air flow, and the coal feeder is automatically stopped: after the coal mining face stops coal production, the weight of the coal stored in the coal bunker is gradually less than the weight of the counterweight under pressure, the door is automatically closed under the action of the gravity of the counterweight under pressure, the air flow is blocked through the door, the door is separated from the travel switch, the normally closed terminal of the travel switch becomes a normally open terminal, the power supply circuit of the coal feeder is cut off, and the coal feeder is automatically stopped.

[0007] Further, in step II, the door is fixed by magnetic attraction after being closed and sealed by air bags: after the door is automatically closed under the action of the gravity of the counterweight under pressure, the metal lining plate inside the door enters the adsorption range of the magnetic adsorption seat, the metal lining plate is adsorbed and fixed by the magnetic adsorption seat through displacement, and the piston valve inside the air bag is triggered during displacement, so that the air bag is inflated, a sealing ring is formed by mutual extrusion of a plurality of air bags surrounding the edge of the door, the gap between the door and the wall of the coal bunker is filled, and the door is sealed.

[0008] Further, the door is hingedly installed at the coal outlet at the lower end of the coal bunker, an adjustable counterweight assembly is arranged at the fixed position of the outer side surface of the door, and a travel switch is arranged on the swing path of the adjustable counterweight assembly, followed by a PLC controller, a vacuum electromagnetic starter, and a coal feeder engine in electrical series.

[0009] The coal bunker has a vertical shaft structure, a plurality of coal mining faces are arranged in the vertical direction of the coal bunker, a plurality of pilot coal chute holes are uniformly arranged on the coal mining faces, and the coal feeder is installed at the same height as the lowermost coal mining face.

[0010] Further, the adjustable counterweight assembly comprises a high-strength screw rod, one end of the high-strength screw rod penetrates the door from the outer side surface of the door, and the other end of the high-strength screw rod is sleeved with the counterweight under pressure and threadedly connected with the inner side end of the high-strength screw rod through a lock nut outside the counterweight under pressure.

[0011] Further, the inner side surface of the door is parallel to the metal lining plate, the metal lining plate is fixedly connected to the movable end of an extension rod, the extension rod is vertically arranged to be telescopically arranged, and the metal lining plate and the inner side surface of the door are elastically connected through a plurality of return springs.

[0012] Further, the piston valve comprises a sliding pipe, the piston cavity in the sliding pipe is communicated with an air inlet and outlet path, the air inlet end of the air inlet and outlet path is provided with an air extraction pump, the air outlet end of the air inlet and outlet path is provided with an air outlet valve, the air extraction pump and the air outlet valve are controlled to open and close by an inductive switch, the inductive switch is arranged on the end surface of the piston cavity, a valve block is slidably arranged in the piston cavity, the valve block alternately controls the air inlet and the air outlet to open, the air inlet and the air outlet are both provided with a plurality of openings on the outer wall of the sliding pipe, a plurality of air inlets are arranged close to one end of the bunker door, and a plurality of air outlets are arranged close to one end of the metal lining plate, and a one-way air exhaust structure is arranged in the sliding direction of the valve block.

[0013] Further, the valve block is fixedly connected to the end of the telescopic rod, the telescopic rod is telescopically arranged relative to the end surface of the sliding pipe, the movable end of the telescopic rod is connected to the metal lining plate through screw cooperation, the telescopic rod is sleeved with the reset spring on the outside, the two ends of the reset spring are fixedly connected to the end surfaces of the metal lining plate and the sliding pipe respectively, a magnetic attraction seat is arranged close to the inner end surface of the metal lining plate, the magnetic attraction seat is arranged on the bunker wall of the coal bunker lower end coal outlet, the magnetic attraction surface of the magnetic attraction seat is arranged in parallel with the closed bunker door, and the distance between the magnetic attraction surface and the inner surface of the bunker door is greater than the distance between the metal lining plate and the bunker door.

[0014] Beneficial effects: the coal bunker air flow automatic blocking control method and the heavy control type air flow automatic blocking control system realize automatic on-off of the air flow in the coal bunker through automatic opening and closing of the bunker door, avoid gas abnormality or gas overrun risk of the methane sensor at the upper opening of the coal bunker, and avoid short circuit of the air flow at the coal bunker to cause no wind or slight wind phenomenon at other related mining faces, effectively ensure the stability of the mine ventilation system, and realize safe production of the mine; through the automatic system such as the travel switch and the PLC controller, the input of the post worker at the coal bunker is effectively reduced, the input of the post worker is reduced every shift under the premise of intrinsic safety, a series of risks caused by the lack of responsibility or the lack of business of part of the workers is further avoided, and the safety management level of the mine is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] ATTACHED Figure 1 is a work flow chart of the heavy control type air flow automatic blocking control method;

[0016] ATTACHED Figure 2 is a flow chart of sealing;

[0017] ATTACHED Figure 3 is a schematic diagram of the overall structure of the heavy control type air flow automatic blocking control system;

[0018] ATTACHED Figure 4 is a structure diagram of the adjusting counterweight assembly;

[0019] ATTACHEDFigure 5 is a schematic view of the state of the bin door being opened;

[0020] is a schematic view of the state of the bin door being opened; Figure 6 is a schematic view of the connection relationship between the bin door and the metal lining plate;

[0021] is a schematic view of the connection relationship between the bin door and the metal lining plate; Figure 7 is a schematic view of the relative position and structure of the air inlet and outlet paths;

[0022] is a schematic view of the relative position and structure of the air inlet and outlet paths; Figure 8 is a perspective view of the structure of the air bag and the internal piston valve;

[0023] is a perspective view of the structure of the air bag and the internal piston valve; Figure 9 is an exploded view of the one-way exhaust structure;

[0024] is an exploded view of the one-way exhaust structure; Figure 10 is a schematic view of the structure and distribution of the protrusions on the outer surface of the air bag. DETAILED DESCRIPTION

[0025] The present application will be further described below in conjunction with the accompanying drawings.

[0026] As shown in the accompanying drawings, Figures 1-10 a coal bin air flow automatic blocking and control method and a heavy control type air flow automatic blocking and control system, which automatically turns on and off the air flow in a coal bin 1, realizes the closure of the bin door 3 at the lower end of the coal bin 1 and the coal bin 1 wall under the action of an adjustable counterweight assembly 2, achieves the effect of blocking the air flow in the coal bin 1, and is applied to actual mine operations, and specifically includes the following working steps:

[0027] Step I: The mining working face 4 starts to discharge coal, the bin door 3 is automatically opened, and the coal feeder 5 is started and continuously works: after the mining working face 4 starts to discharge coal, a small amount of coal enters the bottom of the coal bin 1 through the pilot coal caving eye 6, when the weight of the coal stored in the coal bin 1 exceeds the weight of the counterweight, the bin door 3 is automatically opened, during which the travel switch 7 is touched, so that the travel switch 7 is powered, the normally open terminal inside the travel switch 7 becomes a normally closed terminal, and the PLC controller 8 provides power to the control system loop of the vacuum electromagnetic starter 9, which makes the power supply loop of the vacuum electromagnetic starter 9 closed through the principle of weak current controlling strong current, to supply power to the coal feeder 5, so that the coal feeder 5 continuously works;

[0028] Step II, the coal mining face 4 stops coal production, the door 3 is automatically closed to block the airflow, and the coal feeder 5 is automatically stopped: after the coal mining face 4 stops coal production, the weight of the coal stored in the coal bunker 1 is gradually less than the weight of the pressure-bearing counterweight 13, the door 3 is automatically closed under the gravity of the pressure-bearing counterweight 13, the airflow is blocked through the door 3, the door 3 is separated from the travel switch 7, the normally closed terminal of the travel switch 7 becomes a normally open terminal, the power supply circuit of the coal feeder 5 is cut off, and the coal feeder 5 is automatically stopped.

[0029] In step II, the door 3 is closed and fixed by magnetic attraction, and the sealing of the door 3 is realized by the air bag 18: when the door 3 is automatically closed under the gravity of the pressure-bearing counterweight 13, the metal lining plate 15 inside the door 3 enters the adsorption range of the magnetic adsorption seat 30, the metal lining plate 15 is adsorbed and fixed by the magnetic adsorption seat 30, and the displacement triggers the piston valve 19 inside the air bag 18, so that the air bag 18 is inflated, a plurality of air bags 18 around the edge of the door 3 are pressed to form a sealing ring, the gap between the door 3 and the wall of the coal bunker 1 is filled, and the sealing of the door 3 is realized.

[0030] The door 3 is hingedly installed at the lower end of the coal bunker 1, the adjustable counterweight assembly 2 is arranged at the fixed position of the outer end surface of the door 3, the travel switch 7 is arranged on the swing path of the adjustable counterweight assembly 2, and the PLC controller 8, the vacuum electromagnetic starter 9 and the coal feeder engine 10 are sequentially and electrically connected in series behind the travel switch 7; the coal bunker 1 is a vertical shaft structure, a plurality of coal mining faces 4 are arranged in the vertical direction of the coal bunker 1, a plurality of pilot coal chute eyes 6 are uniformly arranged on the coal mining faces 4, and the coal feeder 5 is installed at the same height as the lowermost coal mining face 4.

[0031] The adjustable counterweight assembly 2 includes a high-strength screw rod 11, one end of the high-strength screw rod 11 penetrates the door 3 from the outer end surface of the door 3, and the other end of the high-strength screw rod 11 is sleeved with the pressure-bearing counterweight 13, and the outer side of the pressure-bearing counterweight 13 is threadedly connected with the outer end of the high-strength screw rod 11 through the lock nut 14;

[0032] By changing the position of the adjusting nut and the lock nut on the high-strength screw rod, the position of the high-strength screw rod relative to the door is adjusted, and the position of the pressure-bearing weight relative to the high-strength screw rod is adjusted, thereby adjusting the distance between the pressure-bearing weight and the outer side of the door, and adjusting the natural downward position angle of the door by using the pressure-bearing weight, so that the door is closed with the coal bunker wall to block the air flow. By selecting pressure-bearing weights of different weights, the weight of the accumulated coal that can open the door is controlled, so that the door is opened to discharge coal when there is enough accumulated coal.

[0033] The inner side end surface of the door 3 is provided with the metal lining plate 15 parallel to the inner side end surface, and the metal lining plate 15 is fixedly connected to the movable end of the telescopic rod 16. The telescopic rod 16 is telescopically arranged perpendicular to the inner side end surface of the door 3. The metal lining plate 15 and the inner side surface of the door 3 are elastically connected by a plurality of return springs 17.

[0034] The telescopic rod and the return spring make the metal lining plate elastically float relative to the inner side surface of the door. During the opening and closing of the door, the metal lining plate plays a buffering role, reduces the influence of the weight of the accumulated coal on the door, and increases the pressure-bearing capacity of the door. In the state of opening the door, the metal lining plate plays a buffering role of the impact force caused by the falling of the coal during the discharging process.

[0035] The piston valve 19 includes a sliding pipe 21, and a piston cavity 22 in the sliding pipe 21 is communicated with an inlet and outlet air path 23. An air inlet end 24 of the inlet and outlet air path 23 is provided with a suction pump, and an air outlet end 25 of the inlet and outlet air path 23 is provided with an air outlet valve. The suction pump and the air outlet valve are both controlled to open and close by an induction switch 26. The induction switch 26 is arranged on the end surface of the piston cavity 22. A valve block 27 is slidably arranged in the piston cavity 22. The valve block 27 alternately controls the opening of an air inlet 28 and an air outlet 29. The air inlet 28 and the air outlet 29 are both provided with a plurality of openings around the outer wall of the sliding pipe 21. A plurality of air inlets 28 are arranged near one end of the door 3, and a plurality of air outlets 28 are arranged near one end of the metal lining plate 15. A one-way air outlet structure 31 is arranged in the valve block 27 along the sliding direction.

[0036] By moving the valve block to control the opening and closing of the air inlet and exhaust port, after the door is closed, the valve block is moved away from the air inlet, so that the air inlet is opened, and at the same time, the valve block is moved to and blocks the exhaust port until the valve block moves to the end of the piston cavity, the valve block touches the induction switch, so that the air pump works for a short time, air is extracted from the air inlet, flows through the inlet and outlet air path, enters the air bag through the air inlet, so that the air bag inflates, the adjacent air bags are pressed against each other, fill the gap, and achieve the effect of sealing; at the moment when the door is opened, the valve block is moved away from the exhaust port, so that the exhaust port is opened, and at the same time, the valve block is moved to and blocks the air inlet, during which the gas in the air bag enters the piston cavity through the exhaust port, and then enters the inlet and outlet air path through the one-way exhaust structure, at the same time, the valve block is separated from the induction switch to open the exhaust valve, so that the gas in the inlet and outlet air path is discharged, the air bag is deflated, the friction between the air bag and the bin wall is reduced, the air bag is protected, and the service life of the air bag is increased.

[0037] The valve block 27 is fixedly connected to the end of the telescopic rod 16, the telescopic rod 16 is telescopically arranged relative to the end face of the sliding pipe 21, the movable end of the telescopic rod 16 is connected with the metal lining plate 15 through threaded cooperation, the telescopic rod 16 is sleeved with the reset spring 17 outside, the reset spring 17 is fixedly connected to the end faces of the metal lining plate 15 and the sliding pipe 21 respectively, a magnetic attraction seat 30 is arranged close to the inner end face of the metal lining plate 15, the magnetic attraction seat 30 is located on the bin wall of the coal outlet at the lower end of the coal bunker 1, the magnetic attraction surface of the magnetic attraction seat 30 is arranged in parallel with the closed bin door 3, and the distance between the magnetic attraction surface and the inner side surface of the bin door 3 is greater than the distance between the metal lining plate 15 and the bin door 3;

[0038] Mine ventilation safety does not allow any possible safety risks. The warehouse door is fixed by the magnetic seat to provide protection for the closure of the warehouse door. The distance between the magnetic surface and the inner side of the warehouse door 3 is greater than the distance between the metal lining plate 15 and the warehouse door 3. When the warehouse door is closed, the metal lining plate enters the range of the magnetic seat, and then the metal lining plate is adsorbed and moved toward the magnetic seat, thereby pulling the telescopic rod away from the warehouse door. At the same time, the telescopic rod drives the valve block away from the air inlet to realize the inflation of the airbag, that is, the magnetic fixation and airbag sealing are realized at the moment the warehouse door is closed, and the linkage control is realized to quickly block the wind flow. Similarly, when the weight of the coal accumulated in the bin is sufficient to overcome the thrust provided by the pressure counterweight and the adsorption force provided by the magnetic seat, the moment the bin door is opened, the metal lining plate separates from the magnetic seat, and under the action of the reset spring pad, the metal lining plate is pulled close to the bin door, thereby causing the telescopic rod to contract and move close to the bin door. At the same time, the telescopic rod drives the valve block away from the exhaust hole, and continues the piston sliding motion to extract the gas in the airbag and discharge it through the one-way exhaust structure. That is, at the moment the bin door is opened, the extrusion of the metal lining plate and the extraction of the piston valve are utilized to achieve rapid deflation of the airbag, thereby protecting the airbag and reducing the resistance to opening the bin door.

[0039] The one-way exhaust structure 31 includes a bucket-shaped through hole 32 opened on the central axis of the valve block 27, a one-way air guide cylinder 33 is sleeved in the bucket-shaped through hole 32, and a porous mesh plate 34 is clamped on the large-diameter end of the bucket-shaped through hole 32, and the porous mesh plate 34 is fixed to the end of the telescopic rod 16; the one-way air guide cylinder 33 is a bucket-shaped rubber cylinder, one end of the one-way air guide cylinder 33 is a circular opening 35, and the other end is a strip-shaped closed end 36, the circular opening 35 is clamped and fixed to the large-diameter end of the bucket-shaped through hole 32 by the porous mesh plate 34, and the strip-shaped closed end 36 passes through the small-diameter end of the bucket-shaped through hole 32;

[0040] The one-way air guide cylinder is used to realize the one-way air guide function. The cylinder walls of the strip closed end are precisely attached together. When the valve block moves toward the exhaust hole, the air between the valve block and the end of the piston cavity is squeezed and the closed end of the strip closed end is pushed open, so that the air between the valve block and the end of the piston cavity is quickly discharged, reducing the sliding resistance of the valve block. When exhausting, the instantaneous rebound force generated by the reset spring causes the valve block to move quickly away from the exhaust port, so that the exhaust port is opened. Under the action of the subsequent metal lining plate continuously squeezing the airbag, the air in the airbag is squeezed into the chamber between the valve block and the end of the piston cavity, thereby pushing open the closed end of the strip closed end, so that the air between the valve block and the end of the piston cavity is quickly discharged, achieving the effect of rapid exhaust, and there will be no gas backflow during the valve block reset process.

[0041] The air bag 18 is a cylindrical elastic sleeve, two ports of the air bag 18 are attached to the end faces of the metal lining plate 15 and the door 3 respectively, and are fixed by two magnetic attraction rings 37, the two magnetic attraction rings 37 are sleeved outside the telescopic rod 16 and the sliding pipe 21 respectively, the outer surface of the air bag 18 is provided with a convex rib 38, the convex rib 38 is sequentially arranged with a broken wave convex rib 39, a wave convex rib 40 and a straight convex rib 41 from the door 3 to the metal lining plate 15, each of the convex ribs 38 is arranged with a plurality of layers of parallel arrangement, wherein the broken wave convex rib 39 is arranged with a plurality of layers of parallel arrangement.

[0042] The cylindrical sleeve structure and the magnetic attraction ring compression fixing can realize the quick installation and disassembly of the air bag, facilitate the replacement of the air bag, the convex ribs on the outer side of the air bag indirectly increase the thickness of the air bag and improve the inflation strength of the air bag, the convex ribs are used for contact with the wall of the warehouse, the wear resistance of the outer surface of the air bag is improved, and the shape and arrangement direction of the convex ribs are beneficial to effectively block the airflow and avoid the strong airflow from forcibly entering.

[0043] The above description is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the above principles of the present application, a number of improvements and refinements can also be made, and these improvements and refinements are also considered to be within the protection scope of the present application.

Claims

1. A method for automatically controlling and regulating the air flow of a coal bunker, characterized in that: The application discloses an automatic wind flow blocking and controlling system for coal bunker, which automatically opens and closes the wind flow in the coal bunker (1) and realizes the closure of the bunker door (3) at the lower end of the coal bunker (1) and the wall of the coal bunker (1) under the action of an adjustable counterweight assembly (2), so that the wind flow in the coal bunker (1) is blocked. Step I: when the coal mining face (4) starts to discharge coal, the bunker door (3) is automatically opened, the coal feeder (5) is started and continuously works; after the coal mining face (4) starts to discharge coal, a small amount of coal enters the bottom of the coal bunker (1) through a pilot caving coal hole (6), when the weight of the coal accumulated in the coal bunker (1) is greater than the weight of the pressure-bearing counterweight (13), the bunker door (3) is automatically opened, during which a travel switch (7) is touched, the travel switch (7) is powered, the normally open terminal in the travel switch (7) becomes a normally closed terminal, the PLC controller (8) supplies power to the control system loop of the vacuum electromagnetic starter (9), the weak current controls the strong current principle, the power supply loop of the vacuum electromagnetic starter (9) is closed, the coal feeder (5) is powered, and the coal feeder (5) continuously works; Step II: when the coal mining face (4) stops discharging coal, the bunker door (3) is automatically closed to block the wind flow, and the coal feeder (5) is automatically stopped: after the coal mining face (4) stops discharging coal, the weight of the coal accumulated in the coal bunker (1) is gradually less than the weight of the pressure-bearing counterweight (13), the bunker door (3) is automatically closed under the action of the gravity of the pressure-bearing counterweight (13), the wind flow is blocked through the bunker door (3), meanwhile, the bunker door (3) is separated from the travel switch (7), the normally closed terminal of the travel switch (7) becomes a normally open terminal, the power supply loop of the coal feeder (5) is cut off, and the coal feeder (5) is automatically stopped; The inner side surface of the bunker door (3) is provided with a metal lining plate (15) in parallel, the metal lining plate (15) is fixedly connected to the movable end of an extension rod (16), the extension rod (16) is vertically arranged in the extension rod (16), and the metal lining plate (15) and the inner side surface of the bunker door (3) are elastically connected through a plurality of reset springs (17); so that the metal lining plate (15) can elastically float relative to the inner side surface of the bunker door (3); After the bunker door (3) is closed, the bunker door (3) is fixed through magnetic attraction and sealed by air bags (18): when the bunker door (3) is automatically closed under the action of the gravity of the pressure-bearing counterweight (13), the metal lining plate (15) on the inner side of the bunker door (3) enters the adsorption range of the magnetic adsorption seat (30), the metal lining plate (15) is displaced by the magnetic attraction and is fixed by the magnetic adsorption seat (30); during the displacement, the piston valve (19) in the air bag (18) is triggered, the air bag (18) is inflated, a plurality of air bags (18) surrounding the edge of the bunker door (3) are pressed to form a sealing ring, the gap between the bunker door (3) and the wall of the coal bunker (1) is filled, and the sealing of the bunker door (3) is realized. When the weight of the coal accumulated in the bin is enough to overcome the thrust provided by the pressure-bearing counterweight (13) and the adsorption force provided by the magnetic seat (30), the bin door (3) is opened, and at the moment of opening, the metal lining plate (15) is separated from the magnetic seat (30); the reset spring (17) pulls the metal lining plate (15) close to the bin door (3), so that the telescopic rod (16) is retracted towards the bin door (3); the telescopic rod (16) drives the valve block (27) to move away from the exhaust port (29), and continuously performs piston movement to extract the gas in the air bag (18), and is discharged by the one-way exhaust structure (31); that is, at the moment of opening the bin door (3), the air bag (18) is rapidly deflated by using the extrusion of the metal lining plate (15) and the extraction of the piston valve (19).

2. A heavy-duty wind flow automatic blocking system, which adopts the coal bunker wind flow automatic blocking method according to claim 1, characterized in that: The adjustable counterweight assembly (2) is arranged on the outer side end surface of the bin door (3) at the coal outlet at the lower end of the coal bin (1), and the travel switch (7) is arranged on the swing path of the adjustable counterweight assembly (2). The travel switch (7) is electrically connected in series with a PLC controller (8), a vacuum electromagnetic starter (9) and a coal feeder engine (10) in sequence. The coal bin (1) is a vertical shaft structure, and a plurality of mining working faces (4) are arranged in the vertical direction of the coal bin (1). A plurality of pilot coal caving eyes (6) are uniformly arranged on each mining working face (4), and the coal feeder (5) is installed at the same height of the lowermost mining working face (4).

3. A heavy-duty wind flow automatic blocking system according to claim 2, characterized in that: The adjustable counterweight assembly (2) includes a high-strength screw rod (11), one end of the high-strength screw rod (11) penetrates the bin door (3) from the outer side end surface of the bin door (3) and is threadedly connected with the inner side end of the high-strength screw rod (11) from the inner side end surface of the bin door (3) through an adjusting nut (12). The other end of the high-strength screw rod (11) is sleeved with the pressure-bearing counterweight (13), and the outer side of the pressure-bearing counterweight (13) is threadedly connected with the outer side end of the high-strength screw rod (11) through a lock nut (14).

4. A heavy-duty wind flow automatic blocking system according to claim 3, characterized in that: The piston valve (19) includes a sliding pipe (21), and the piston cavity (22) in the sliding pipe (21) is communicated with an air inlet and outlet path (23). An air inlet end (24) of the air inlet and outlet path (23) is provided with an air extraction pump, and an air outlet end (25) of the air inlet and outlet path (23) is provided with an air outlet valve. The air extraction pump and the air outlet valve are both controlled to open and close by an induction switch (26), and the induction switch (26) is arranged on the end surface of the piston cavity (22). The valve block (27) is slidably arranged in the piston cavity (22), and the valve block (27) alternately controls the opening of the air inlet (28) and the exhaust port (29). The air inlet (28) and the exhaust port (29) are both arranged on the outer wall of the sliding pipe (21), and a plurality of air inlets (28) are arranged close to one end of the bin door (3), and a plurality of exhaust ports (29) are arranged close to one end of the metal lining plate (15). The one-way exhaust structure (31) is arranged through the valve block (27) in the sliding direction.

5. A heavy-duty wind flow automatic blocking system according to claim 4, characterized in that: The valve block (27) is fixedly connected to the end of the telescopic rod (16), the telescopic rod (16) is telescopically arranged relative to the end face of the sliding pipe (21), and the movable end of the telescopic rod (16) is connected to the metal lining plate (15) through threaded cooperation; The telescopic rod (16) is sleeved with the reset spring (17) outside, and the two ends of the reset spring (17) are fixedly connected to the end faces of the metal lining plate (15) and the sliding pipe (21) respectively; A magnetic attraction seat (30) is arranged close to the inner end face of the metal lining plate (15), the magnetic attraction seat (30) is located on the bin wall of the coal outlet at the lower end of the coal bunker (1), the magnetic attraction surface of the magnetic attraction seat (30) is arranged in parallel with the closed bin door (3), and the distance between the magnetic attraction surface and the inner side face of the bin door (3) is greater than the distance between the metal lining plate (15) and the bin door (3).

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