CN109779669A - A kind of device and its control method of double cylinder automatic control storm doors - Google Patents
A kind of device and its control method of double cylinder automatic control storm doors Download PDFInfo
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- CN109779669A CN109779669A CN201910238266.2A CN201910238266A CN109779669A CN 109779669 A CN109779669 A CN 109779669A CN 201910238266 A CN201910238266 A CN 201910238266A CN 109779669 A CN109779669 A CN 109779669A
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- 238000009423 ventilation Methods 0.000 claims 1
- 239000003245 coal Substances 0.000 abstract description 6
- 238000009434 installation Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 238000005065 mining Methods 0.000 description 1
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Abstract
The invention discloses the devices and its control method of a kind of double cylinder automatic control storm doors, the air-channel system includes first manual two five logical Pneumatic valves, second manual two five logical Pneumatic valves, the manual two five logical Pneumatic valves of third, the first 2/2-way Pneumatic valve, the second 2/2-way Pneumatic valve, the first master cylinder and the second master cylinder, and first manual two five logical Pneumatic valves, second manual two five logical Pneumatic valves and the manual two five logical Pneumatic valves of third are connect with air line；First master cylinder is connected by the first twin cable with the first air door, and the second master cylinder is connected by wirerope with the second air door, is mutually connected in mechanical connection；First air door is oppositely arranged with the second air door, and the first air door and the second air door are staggered the time unlatching；The present invention, which has, guarantees that air door can be opened in coal mine operation, and forms mutual lock-in control, ensures the advantage of mine operation safety.
Description
Technical field
The present invention relates to automation field, it is more particularly to device and its control of a kind of double cylinder automatic control storm doors
Method.
Background technique
It is taken over as coal mine digging is movable, mining depth is also deepened therewith, and the wind pressure in underground part place is very important.
The mode that the prior art opens air door is installation locking rope, but since underground work height is very high and job area is wide, peace
Dress locking rope needs worker to climb to very high location to set up, there are security risk, secondly because operation height is high and operation model
Enclosing extensively needs the amount of locking rope to be mounted more, and cost is very high.
In addition, the requirement to roadway is also big with the investment of large scale equipment, the design and size of air door also increase therewith,
In addition the intensification of mine depth, the increasing of air quantity, wind pressure is also increased with it therewith, causes air door to be opened very laborious.Coal mine is made
Two air doors being oppositely arranged in industry cannot be opened simultaneously, while open there are security risk, and the prior art passes through artificial
Two air doors are controlled not in the same time, working efficiency is not high and expends a large amount of manpowers, while the prior art passes through manually
Air door is controlled, in the case where wind pressure is excessive, air door is fail to open often, influences job schedule.
Although there is the device of producer's research and development cylinder control door opening, due to underground depth down, cylinder pulling force reaches
Less than requiring, and without reasonable air-path control system, can not be applied in coal mine operation well.
Summary of the invention
Technical problem to be solved by the present invention lies in the prior art, there are no perfect air-path control systems to control coal mine
In underground work the problem of door opening.
The present invention is to solve a kind of above-mentioned technical problem: dress of double cylinder automatic control storm doors by the following technical programs
Set, including air-channel system, the first air door, the second air door, the first twin cable, the second twin cable, the first fixed pulley and
Second fixed pulley, first air door include the first impetus, and second air door includes the second impetus, first air door
It is mounted among the wall of front side, the first master cylinder is mounted on the wall of left side, and peace above the first master cylinder is located on the wall of left side
Equipped with the first fixed pulley, the telescopic rod of the first master cylinder end connects the first twin cable, and the first twin cable passes through the
One fixed pulley is connect with the first impetus on the first air door；Second air door be mounted on the wall parallel with front side wall and with
First air door is oppositely arranged, and is located above the second master cylinder on the parallel wall and is installed the second fixed pulley, the second master cylinder
The telescopic rod of end connects the second twin cable, and the second twin cable passes through second on the second fixed pulley and the second air door
Impetus connection；First air door and the second air door are staggered the time unlatching；
The air-channel system includes first manual two five logical Pneumatic valves, the second manual two five logical Pneumatic valves, third hands
Control two five logical Pneumatic valves, the first 2/2-way Pneumatic valve, the second 2/2-way Pneumatic valve, the first master cylinder and the second main gas
Cylinder, described first manual two five logical Pneumatic valves, second manual two five logical Pneumatic valves and the manual two five logical Pneumatic valves of third
It is connect with air line；
First manual two five logical Pneumatic valves are connect with the first 2/2-way Pneumatic valve；Second manual two five logical Pneumatic valves
It is connect with the second 2/2-way Pneumatic valve；First 2/2-way Pneumatic valve connect with the second 2/2-way Pneumatic valve and with
Three manual two five logical Pneumatic valve connections；Third two five logical Pneumatic valves of manual control connect with the first master cylinder and the second master cylinder respectively
It connects；Connection in the air-channel system is air circuit connection.
Preferably, described first manual two five logical Pneumatic valves include it is double open double control switch S1 and S2, the switch S1 with
Switch S2 includes the first terminals, the second terminals and third terminals, the first terminals and switch S2 of the switch S1
The connection of the first terminals, the third terminals of the switch S1 connect with the third terminals of switch S2, the switch S1's
Second terminals are connect with air line.
Preferably, described second manual two five logical Pneumatic valves include it is double open double control switch S3 and S4, the switch S3 with
Switch S4 includes the first terminals, the second terminals and third terminals, the first terminals and switch S4 of the switch S3
The connection of the first terminals, the third terminals of the switch S3 connect with the third terminals of switch S4, the switch S4's
Second terminals are connect with air line.
Preferably, the manual two five logical Pneumatic valves of the third include normally closed switch S5 and normally closed switch S6, the switch
S5 and switch S6 includes the first terminals, the second terminals and third terminals, the second terminals of the switch S5 with open
It closes the second terminals connection of S6 and is connected with air line；The normally closed switch S5 includes the first control air source input end,
The normally closed switch S6 includes the second control air source input end, and the first control air source input end and the first 2/2-way Pneumatic valve connect
It connects, the second control air source input end is connect with the second 2/2-way Pneumatic valve.
Preferably, first master cylinder be two cylinders in parallel, two cylinders in parallel have the first air inlet and
Second air inlet, the first air inlet of two cylinders in parallel are connected to the first air inlet of the first master cylinder, two parallel connections
The second air inlet of cylinder be connected to the second air inlet of the first master cylinder；The first terminals of the normally closed switch S5 with
First air inlet of the first master cylinder connects, the third terminals of the normally closed switch S5 and the second air inlet of the first master cylinder
Connection.
Preferably, second master cylinder be two cylinders in parallel, two cylinders in parallel have third air inlet and
4th air inlet, the third air inlet of two cylinders in parallel are connected to the third air inlet of the second master cylinder, two parallel connections
The 4th air inlet of cylinder be connected to the 4th air inlet of the second master cylinder；The first terminals of the normally closed switch S6 with
The third air inlet of second master cylinder connects, the third terminals of the normally closed switch S6 and the 4th air inlet of the second master cylinder
Connection.
Preferably, the first 2/2-way Pneumatic valve includes the first air inlet, the first gas outlet and the second gas outlet, institute
State the first of the second terminals of the switch S2 of first manual two five logical Pneumatic valves and the first 2/2-way Pneumatic valve into
Port connection.
Preferably, the second 2/2-way Pneumatic valve includes the second air inlet, third gas outlet and the 4th gas outlet, institute
State the second of the second terminals of the switch S3 of second manual two five logical Pneumatic valves and the second 2/2-way Pneumatic valve into
Port connection；The third gas outlet is connect with the first gas outlet and the second control air source input end respectively；Second outlet
Mouth is connect with the 4th gas outlet and the first control air source input end respectively.
The present invention also provides a kind of control methods of the device of double cylinder automatic control storm doors, comprising:
Original state, the first master cylinder and the second master cylinder are failure to actuate, and the first air door and the second air door are failure to actuate, and are pressed manually
Any of dynamic switch S1, switch S2 switch；
Gas circuit conducting where first manual two five logical Pneumatic valves, the first of the first 2/2-way Pneumatic valve being attached thereto
Air inlet conducting, starts air inlet, and the gas come out from the first gas outlet enters the third gas outlet of the second 2/2-way Pneumatic valve
Air source input end is controlled with the second of two five logical Pneumatic valves of third gas control, when pressing opening for second manual two five logical Pneumatic valves
It closes S3 or switch S4, gas circuit conducting where second manual two five logical Pneumatic valves is formed with the gas come out from the first gas outlet
Pressure, normally closed switch S6 are failure to actuate, and the second master cylinder is failure to actuate, and the second air door is not turned on；
The gas come out from the second gas outlet enters the first control air source input end of two five logical Pneumatic valves of third gas control,
Its internal guide's valve events, normally closed switch S5 become normally opened, and gas circuit conducting where the first master cylinder, gas enters the first master cylinder
The first air inlet, and come out from the second air inlet of the first master cylinder, the work of the first master cylinder, drop the first air door, first
Door opening.
The present invention has the advantage that compared with prior art
(1) by designing the air-channel system of double cylinder automatic control storm doors, guarantee that air door can be opened in coal mine operation
It opens, and forms mutual lock-in control, guarantee that be oppositely arranged two air doors are not opened simultaneously, it is another after a door opening
A air door cannot be opened anyway, ensure mine operation safety.
(2) by the way that the air-channel system of double cylinder automatic control storm doors is arranged, air door is dropped using cylinder, is avoided using a large amount of
Locking rope, save material, save cost.
(3) design for passing through the first master cylinder and the second master cylinder, considerably increases the pulling force of air-channel system starting, solves
The problem of in underground work, depth of implements is deep, and air door pressure air door caused greatly is fail to open.
Detailed description of the invention
Fig. 1 is a kind of air-channel system unilateral side peace of the device of double cylinder automatic control storm doors disclosed in the embodiment of the present invention
Fill schematic diagram；
Fig. 2 is a kind of principle of the air-channel system of the device of double cylinder automatic control storm doors disclosed in the embodiment of the present invention
Schematic diagram.
Specific embodiment
It elaborates below to the embodiment of the present invention, the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following implementation
Example.
As shown in Figure 1, the air-channel system unilateral side scheme of installation of the device for double cylinder automatic control storm doors, double gas
The device of cylinder automatic control storm door includes air-channel system (figure do not mark), the first air door 9, the second air door (not shown), first bifilar
Wirerope 11, the second twin cable (not shown), the first fixed pulley 10 and the second fixed pulley (not shown), first air door
9 include the first impetus 12, and second air door includes the second impetus, has the first air door 9 among the wall of front side, in left side wall
Two cylinders in parallel are installed on body, i.e. the first master cylinder 6 installs the first fixed pulley 10 on the wall of the top of first master cylinder 6,
The telescopic rod of first master cylinder, 6 end connects the first twin cable 11, and the first twin cable 11 passes through the first fixed pulley 10
It is connect with the first impetus 12 on the first air door 9, when the first master cylinder 6 acts, telescopic rod is shunk, and twin cable 11 is drawn
First air door 9, the first air door 9 are opened；Other side installation and the unilateral side shown in Fig. 1 of the air-channel system of double cylinder automatic control storm doors
Installation site is opposite, and Fig. 1 is not shown, and the second air door is mounted on the wall parallel with front side wall to be set relatively with the first air door 9
It sets, the second master cylinder 7 is mounted on the parallel wall, and the second fixed pulley, 7 end of the second master cylinder are installed on the parallel wall
The telescopic rod in portion connects the second twin cable, and the second twin cable passes through second on the second fixed pulley and the second air door
Force connection, when the second master cylinder 7 acts, telescopic rod is shunk, and the second twin cable draws the second air door, and the second air door is beaten
It opens；When the first air door 9 has already turned on, when the second air door is fail to open or the second air door is opened, the first air door 9 can not be opened
It opens, that is, unlatching of staggering the time.
As shown in Fig. 2, a kind of air-channel system of double cylinder automatic control storm doors, including first manual two five logical Pneumatic valves
1, second manual two five logical Pneumatic valves 2, third manual two five logical Pneumatic valves 3,4, second liang of the first 2/2-way Pneumatic valve
Two logical Pneumatic valves 5 of position, the first master cylinder 6 and the second master cylinder 7.
Described first manual two five logical Pneumatic valves 1 open double control switch S1 and S2, the switch S1 and switch S2 including double
It include the first terminals, the second terminals and third terminals, the of the first terminals S11 and switch S2 of the switch S1
One terminals S21 connection, the third terminals S23 of the third terminals S13 and switch S2 of the switch S1 are connect, the switch
The second terminals S12 of S1 is connect with air line 8.
Described second manual two five logical Pneumatic valves 2 open double control switch S3 and S4, the switch S3 and switch S4 including double
It include the first terminals, the second terminals and third terminals, the of the first terminals S31 and switch S4 of the switch S3
One terminals S41 connection, the third terminals S43 of the third terminals S33 and switch S4 of the switch S3 are connect, the switch
The second terminals S42 of S4 is connect with air line 8.
The manual two five logical Pneumatic valves 3 of the third include normally closed switch S5 and normally closed switch S6, the switch S5 and open
Closing S6 includes the first terminals, the second terminals and third terminals, the second terminals S52 and switch S6 of the switch S5
The second terminals S62 connection and with air line 8 connect；The normally closed switch S5 includes the first control air source input end
S54, the normally closed switch S6 include the second control air source input end S64, the first control air source input end S54 and the first two two
Logical Pneumatic valve 4 connects, and the second control air source input end S64 is connect with the second 2/2-way Pneumatic valve 5.
The first 2/2-way Pneumatic valve 4 includes the first air inlet 41, the first gas outlet 42 and the second gas outlet 43, institute
State the of the second terminals S22 of the switch S2 of first manual two five logical Pneumatic valves 1 and the first 2/2-way Pneumatic valve 4
The connection of one air inlet 41.
The second 2/2-way Pneumatic valve 5 includes the second air inlet 51, third gas outlet 52 and the 4th gas outlet 53, institute
State the of the second terminals S32 of the switch S3 of second manual two five logical Pneumatic valves 2 and the second 2/2-way Pneumatic valve 5
The connection of two air inlets 51；The third gas outlet 52 is connect with the first gas outlet 42 and the second control air source input end S64 respectively；
Second gas outlet 43 is connect with the 4th gas outlet 53 and the first control air source input end S54 respectively.
First master cylinder 6 be two cylinders in parallel, two cylinders in parallel have the first air inlet and second into
Stomata, the first air inlet of two cylinders in parallel are connected to the first air inlet of the first master cylinder 6, two cylinders in parallel
The second air inlet be connected to the second air inlet of the first master cylinder 6；The first terminals S51 of the normally closed switch S5 and
First air inlet of one master cylinder 6 connects, the third terminals S53 of the normally closed switch S5 and the first master cylinder 6 second into
Stomata connection.
Second master cylinder 7 be two cylinders in parallel, two cylinders in parallel have third air inlet and the 4th into
Stomata, the third air inlet of two cylinders in parallel are connected to the third air inlet of the second master cylinder 7, two cylinders in parallel
The 4th air inlet be connected to the 4th air inlet of the second master cylinder 7；The first terminals S61 of the normally closed switch S6 and
The third air inlets of two master cylinders 7 connects, the third terminals S63 of the normally closed switch S6 and the second master cylinder 7 the 4th into
Stomata connection.
It should be noted that connection all in Fig. 2 be by air circuit connection, and it is all about first, second etc.
Ordinal number without sequence requirement, be intended merely to distinguish and the prefix that adds.
The course of work of the invention are as follows:
Original state, the first master cylinder 6 and the second master cylinder 7 are failure to actuate, and the first air door 9 and the second air door are failure to actuate, hand
It is dynamic to press any of switch S1, switch S2 switch；
First manual two five logical 1 place gas circuits of Pneumatic valve conductings, the of the first 2/2-way Pneumatic valve 4 being attached thereto
The conducting of one air inlet 41, starts air inlet, and the gas come out from the first gas outlet 42 enters the third of the second 2/2-way Pneumatic valve 5
The second of the two five logical Pneumatic valves in gas outlet 52 and third gas control controls air source input end S64, two five manual when pressing second
The switch S3 or switch S4 of logical Pneumatic valve 2, second manual two five logical 2 place gas circuits of Pneumatic valve conductings and from the first gas outlet 42
Gas out forms equipressure, and normally closed switch S6 is failure to actuate, and the second master cylinder 7 is failure to actuate, and the second air door is not turned on；
The gas come out from the second gas outlet 43 enters the first control gas source input of two five logical Pneumatic valves of third gas control
S54, internal guide's valve events are held, normally closed switch S5 becomes normally opened, the conducting of 6 place gas circuit of the first master cylinder, and gas enters the
First air inlet of one master cylinder 6, and being come out from the second air inlet of the first master cylinder 6, the work of the first master cylinder 6, traction the
One twin cable 11, drops the first air door 9, and the first air door 9 is opened.
Similarly, original state, the first master cylinder 6 and the second master cylinder 7 are failure to actuate, and the first air door 9 and the second air door are motionless
Make, any of manually actuated switch S3, switch S4 switch；Second door opening, the first air door 9 are fail to open.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (9)
1. a kind of device of double cylinder automatic control storm doors, which is characterized in that including air-channel system, the first air door, the second air door,
First twin cable, the second twin cable, the first fixed pulley and the second fixed pulley, first air door are puted forth effort including first
Point, second air door include the second impetus, and first air door is mounted among the wall of front side, and the first master cylinder is mounted on
On the wall of left side, it is located above the first master cylinder on the wall of left side and the first fixed pulley is installed, the first master cylinder end is stretched
Bar connects the first twin cable, and the first twin cable is connected by the first impetus on the first fixed pulley and the first air door
It connects；Second air door is mounted on the wall parallel with front side wall and is oppositely arranged with the first air door, on the parallel wall
Second fixed pulley is installed above the second master cylinder, the telescopic rod of the second master cylinder end connects the second twin cable, the
Two twin cables are connect by the second fixed pulley with the second impetus on the second air door；First air door and the second air door
It staggers the time unlatching；
The air-channel system includes first manual two five logical Pneumatic valves, the second manual two five logical Pneumatic valves, third manual controls two
Five logical Pneumatic valves of position, the first 2/2-way Pneumatic valve, the second 2/2-way Pneumatic valve, the first master cylinder and the second master cylinder,
First manual two five logical Pneumatic valves, second manual two five logical Pneumatic valves and the manual two five logical Pneumatic valves of third with
Air line connection；
First manual two five logical Pneumatic valves are connect with the first 2/2-way Pneumatic valve；Second manual two five logical Pneumatic valves and the
The connection of two 2/2-way Pneumatic valves；First 2/2-way Pneumatic valve connect with the second 2/2-way Pneumatic valve and with third hand
Two five logical Pneumatic valve connections of control；Third two five logical Pneumatic valves of manual control are connect with the first master cylinder and the second master cylinder respectively；
Connection in the air-channel system is air circuit connection.
2. a kind of device of double cylinder automatic control storm doors according to claim 1, which is characterized in that described first is manual
Two five logical Pneumatic valves open double control switch S1 and S2 including double, and the switch S1 and switch S2 include the first terminals, second
Terminals and third terminals, the first terminals of the switch S1 are connect with the first terminals of switch S2, the switch S1
Third terminals connect with the third terminals of switch S2, the second terminals of the switch S1 are connect with air line.
3. a kind of device of double cylinder automatic control storm doors according to claim 2, which is characterized in that described second is manual
Two five logical Pneumatic valves open double control switch S3 and S4 including double, and the switch S3 and switch S4 include the first terminals, second
Terminals and third terminals, the first terminals of the switch S3 are connect with the first terminals of switch S4, the switch S3
Third terminals connect with the third terminals of switch S4, the second terminals of the switch S4 are connect with air line.
4. a kind of device of double cylinder automatic control storm doors according to claim 3, which is characterized in that the third is manual
Two five logical Pneumatic valves include normally closed switch S5 and normally closed switch S6, the switch S5 and switch S6 include the first terminals,
Second terminals and third terminals, the second terminals of the switch S5 connect with the second terminals of switch S6 and with pressure
Air pipe line is connected；The normally closed switch S5 includes the first control air source input end, and the normally closed switch S6 includes the second control gas
Source input terminal, the first control air source input end are connect with the first 2/2-way Pneumatic valve, the second control air source input end and second
The connection of 2/2-way Pneumatic valve.
5. a kind of device of double cylinder automatic control storm doors according to claim 4, which is characterized in that the first main gas
Cylinder is two cylinders in parallel, and two cylinders in parallel have the first air inlet and the second air inlet, two cylinders in parallel
First air inlet is connected to the first air inlet of the first master cylinder, and the second air inlet of two cylinders in parallel is connected to
Second air inlet of one master cylinder；The first terminals of the normally closed switch S5 are connect with the first air inlet of the first master cylinder,
The third terminals of the normally closed switch S5 are connect with the second air inlet of the first master cylinder.
6. a kind of device of double cylinder automatic control storm doors according to claim 4, which is characterized in that the second main gas
Cylinder is two cylinders in parallel, and two cylinders in parallel have a third air inlet and the 4th air inlet, two cylinders in parallel
Third air inlet is connected to the third air inlet of the second master cylinder, and the 4th air inlet of two cylinders in parallel is connected to
4th air inlet of two master cylinders；The first terminals of the normally closed switch S6 are connect with the third air inlet of the second master cylinder,
The third terminals of the normally closed switch S6 are connect with the 4th air inlet of the second master cylinder.
7. a kind of device of double cylinder automatic control storm doors according to claim 5 or 6, which is characterized in that described first
2/2-way Pneumatic valve includes the first air inlet, the first gas outlet and the second gas outlet, the described first manual two five ventilations control
The second terminals of the switch S2 of valve are connect with the first air inlet of the first 2/2-way Pneumatic valve.
8. a kind of device of double cylinder automatic control storm doors according to claim 7, which is characterized in that described the second two
Two logical Pneumatic valves include the second air inlet, third gas outlet and the 4th gas outlet, described second manual two five logical Pneumatic valves
The second terminals of switch S3 are connect with the second air inlet of the second 2/2-way Pneumatic valve；The third gas outlet difference
It is connect with the first gas outlet and the second control air source input end；Second gas outlet is controlled with the 4th gas outlet and first respectively
Air source input end connection.
9. a kind of control method of the device of double cylinder automatic control storm doors according to claim 1-8, special
Sign is, comprising:
Original state, the first master cylinder and the second master cylinder are failure to actuate, and the first air door and the second air door are failure to actuate, manually actuated to open
Close any of S1, switch S2 switch；
Gas circuit conducting where first manual two five logical Pneumatic valves, the first air inlet of the first 2/2-way Pneumatic valve being attached thereto
Mouthful conducting, starts air inlet, the gas come out from the first gas outlet enters the third gas outlet and the of the second 2/2-way Pneumatic valve
Second control air source input end of the logical Pneumatic valve of three gas control two five, as the switch S3 for pressing second manual two five logical Pneumatic valves
Or switch S4, gas circuit conducting forms equipressure with the gas come out from the first gas outlet where second manual two five logical Pneumatic valves,
Normally closed switch S6 is failure to actuate, and the second master cylinder is failure to actuate, and the second air door is not turned on；
The gas come out from the second gas outlet enters the first control air source input end of two five logical Pneumatic valves of third gas control, in
Guide's valve events in portion, normally closed switch S5 become normally opened, gas circuit conducting where the first master cylinder, and gas enters the of the first master cylinder
One air inlet, and come out from the second air inlet of the first master cylinder, the work of the first master cylinder drops the first air door, the first air door
It opens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910238266.2A CN109779669B (en) | 2019-03-27 | 2019-03-27 | Control method of device for automatically controlling air door by double cylinders |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910238266.2A CN109779669B (en) | 2019-03-27 | 2019-03-27 | Control method of device for automatically controlling air door by double cylinders |
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| CN109779669B CN109779669B (en) | 2024-01-23 |
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| CN201910238266.2A Active CN109779669B (en) | 2019-03-27 | 2019-03-27 | Control method of device for automatically controlling air door by double cylinders |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114263489A (en) * | 2021-12-21 | 2022-04-01 | 山东东山新驿煤矿有限公司 | Small automatic air door for coal mine, control method and air door system |
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