CN208310832U - A kind of pneumatic air door clamp plate type throttle locking device - Google Patents
A kind of pneumatic air door clamp plate type throttle locking device Download PDFInfo
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- CN208310832U CN208310832U CN201820261155.4U CN201820261155U CN208310832U CN 208310832 U CN208310832 U CN 208310832U CN 201820261155 U CN201820261155 U CN 201820261155U CN 208310832 U CN208310832 U CN 208310832U
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- 230000017105 transposition Effects 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 9
- 230000001050 lubricating effect Effects 0.000 claims description 7
- 238000009423 ventilation Methods 0.000 claims description 6
- 230000008602 contraction Effects 0.000 abstract description 2
- 229920003266 Leaf® Polymers 0.000 description 25
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of pneumatic air door clamp plate type throttle locking device, comprising: air inlet pipe and: the air door snap-gauge for being separately positioned on the passage cylinder of two pectinid doors and being driven by the passage cylinder；Each air door is respectively arranged with locking unit, and the air inlet pipe is connected to the air inlet of the locking unit of two air doors respectively, and the gas outlet of the locking unit of each air door is connected to the passage cylinder of another air door；The control device for being connected to or being disconnected with gas outlet by the air inlet for opening or closing the locking unit that triggering controls the air door of the air door is additionally provided on each air door.The utility model does power by using gas source, replaces rope traction, and using operated pneumatic valve as control element, cylinder to realize the stretching and contraction of air door snap-gauge, and then limits the unlatching of air door, easy to maintain, high safety, high reliablity as executive component.
Description
Technical field
The utility model relates to coal mine operation correlative technology field, especially a kind of pneumatic air door clamp plate type air door is closed
Locking device.
Background technique
Existing throttle locking device, mainly dragline type air door clamp plate type throttle locking device are passed using seizing wire
It is dynamic, it is pushed and pulled by two sides air door and generates power, limited two sides air door by adjusting the length of wirerope, prevent it from opening simultaneously
It opens.Through use after a period of time, it is found that the air door switch time is long, locking rope causes wirerope very with the friction back and forth of pulley
It is easy fracture of wire, one group of air door, more than ten of pulley, each lubricated maintenance time is longer, tens groups of underground air door, later maintenance task
It is heavy, it puts into quite big.
The structural principle of dragline type air door clamp plate type throttle locking device and there are the problem of: existing dragline type air door
Clamp plate type throttle locking device, the main circular shaft rotation using on resistance door device, which makes to be welded on the air door snap-gauge on circular shaft, to be done and moves down
It is dynamic, realize air door locking and unlock.The angle of air door clamp moving, which is subject to, thoroughly prevents two fan door openings (adjustable), by two
Root antiposition tension spring one is hung on the transverse slat of circular shaft top 30mm, and other end is fixed on the frame of resistance door device.Due to air door card
Plate own wt and direction graviational interaction can make air door snap-gauge be in the state downwardly turned over, and main extension spring is fixed on air door crossbeam
Tension spring is connect with the air door snap-gauge on resistance door device with wirerope, reduces frictional force, the connection of wirerope one end using pulley by end
The tension spring other end connects at the maximum angle of air door snap-gauge head, since the reversed tension spring stress on air door snap-gauge is above circular shaft
At 30mm, main spring connecting portion stress can overcome the drawing of reversed tension spring at air door snap-gauge 150mm under the action of lever principle
Power easily by air door snap-gauge pull-up, connects another steel cable in air door snap-gauge junction in main spring simultaneously and is slided by two guiding
Wheel is series on two force rods of opposite air door, and steel cord ends are fixed on the bolt at the 300mm of force rod front, is come real
Force rod movement can link the mechanical movement of opposite air door when existing door opening.
However, the locking rope of existing dragline type air door clamp plate type throttle locking device causes steel with the friction back and forth of pulley
Cord is easy to fracture of wire, tens groups of underground air door, and fracture of wire phenomenon often occurs in one group of air door, more than ten of pulley, and locking is caused to lose
Effect, causes great security risk to underground ventilating, and each lubricated maintenance time is longer, and later maintenance task is heavy, puts into phase
When big.And air door wirerope connect back and forth it is more complicated, every time more change steel rope can only special messenger be responsible for, it is very inconvenient.
Utility model content
Based on this, it is necessary to cause to be easy to appear fracture of wire due to using drawstring for the throttle locking device of the prior art
Phenomenon causes to be latched the technical issues of failing, provides a kind of pneumatic air door clamp plate type throttle locking device.
The utility model provides a kind of pneumatic air door clamp plate type throttle locking device, comprising: air inlet pipe and:
The air door snap-gauge for being separately positioned on the passage cylinder of two pectinid doors and being driven by the passage cylinder；
Each air door is respectively arranged with locking unit, the air inlet pipe respectively with the locking unit of two air doors
Air inlet connection, the gas outlet of the locking unit of each air door is connected to the passage cylinder of another air door；
The locking list for opening or closing triggering and controlling the air door by the air door is additionally provided on each air door
The control device that the air inlet of member is connected to or disconnects with gas outlet.
Further, each air door includes first door leaf, the second door leaf, and the locking unit includes the first pneumatic operated valve
Door, the second operated pneumatic valve, the air inlet pipe respectively with the air inlet of first operated pneumatic valve of each locking unit, institute
State the air inlet connection of the second operated pneumatic valve；
The gas outlet of first operated pneumatic valve of the locking unit of each air door, second operated pneumatic valve go out
Port is connected to the passage cylinder of another air door respectively；
The control device of each air door includes the triggering that opens or closes by the first door leaf, described in control
The air inlet of first operated pneumatic valve and the first controller of gas outlet on-off and touching is opened or closed by second door leaf
Hair controls the air inlet of second operated pneumatic valve and the second controller of gas outlet on-off.
Further, the locking unit further includes third operated pneumatic valve, the 4th operated pneumatic valve, the 4th pneumatic operated valve
The gas outlet of door is communicated with the atmosphere, the air inlet of the third operated pneumatic valve of the locking unit of each air door and another institute
State the passage cylinder connection of air door, the air inlet and same wind of the 4th operated pneumatic valve of the locking unit of each air door
The gas outlet connection of the third operated pneumatic valve of door.
Further, the control device of each air door includes opening or closing touching by the first door leaf
Hair, the air inlet for controlling first operated pneumatic valve are connected to gas outlet and control the air inlet and outlet of four operated pneumatic valve
Mouthful disconnect or control first operated pneumatic valve air inlet and gas outlet disconnect and control the 4th operated pneumatic valve into
The first controller that port is connected to gas outlet and the triggering that opens or closes by second door leaf, control described second
The air inlet of operated pneumatic valve is connected to gas outlet and controls the air inlet of the third operated pneumatic valve and gas outlet disconnects or controls
The air inlet and gas outlet for making second operated pneumatic valve disconnect and control air inlet and the gas outlet of the third operated pneumatic valve
The second controller of connection.
Further, first operated pneumatic valve is the first two-position three-way valve, and second operated pneumatic valve is second liang
Position three-way valve, the third operated pneumatic valve are third two-position three-way valve, and the 4th operated pneumatic valve is the 4th two-position three-way valve, often
First two-position three-way valve of a control device transposition valve body and the 4th two-position three-way valve transposition valve body by
The driving of first slide bar, the transposition valve body of second two-position three-way valve and the transposition valve body of the third two-position three-way valve are by second
Slide bar driving, first controller are that the doorframe of air door is arranged in contact with first door leaf and connect with first slide bar
The first magnet, the second controller be arranged in air door doorframe can be contacted with the second door leaf and with second slide bar connect
The second magnet connect.
It further, further include pneumatic pressure regulation air filtration component, the locking with two air doors respectively of described air inlet pipe one end
The air inlet of unit is connected to, and the other end is connect by the pneumatic pressure regulation air filtration component with mine pressure ventilation system.
It further, further include the pressure gauge and lubricating arrangement, the other end of the air inlet pipe passes sequentially through described
Lubricating arrangement, the pressure gauge, the pneumatic pressure regulation air filtration component are connect with mine pressure ventilation system.
Further, described air inlet pipe one end passes through the air inlet pipe threeway air inlet with the locking unit of two air doors respectively
Mouth connection.
It further, further include the reset spring being connect with the air door snap-gauge.
The utility model does power by using gas source, replaces rope traction, using operated pneumatic valve as control element,
Cylinder to realize the stretching and contraction of air door snap-gauge, and then limits the unlatching of air door, easy to maintain, safety as executive component
Property strong, high reliablity.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of pneumatic air door clamp plate type throttle locking device of the utility model；
Fig. 2 is the enlarged diagram of the utility model locking unit.
Specific embodiment
The utility model is described in more detail in the following with reference to the drawings and specific embodiments.
As depicted in figs. 1 and 2, a kind of pneumatic air door clamp plate type throttle locking device of the utility model, comprising: air inlet pipe 1,
And:
The air door snap-gauge for being separately positioned on the passage cylinder of two pectinid doors 2,3 and being driven by the passage cylinder；
Each air door 2,3 is respectively arranged with locking unit 4, as shown in Fig. 2, the air inlet pipe 1 is respectively and described in two
The air inlet of the locking unit of air door is connected to, the passage of the gas outlet of the locking unit of each air door and another air door
Cylinder 5 is connected to；
The locking list for opening or closing triggering and controlling the air door by the air door 2 is additionally provided on each air door
The control device that the air inlet of member is connected to or disconnects with gas outlet.
Specifically, the gas outlet of the locking unit of each air door passes through escape pipe 6,7 and another air door
Passage cylinder 5 is connected to.When a wherein air door, such as when air door 2 is opened, the control device of the unlatching triggering air door 2 of air door, control
The air inlet of locking unit is connected to gas outlet, so that locking unit of the air inlet pipe 1 through air door 2, passes through escape pipe 6 and air door 3
Passage cylinder 5 be connected to, to open the passage cylinder that air supply channel makes gas source enter air door 3, passage cylinder acting pushes wind
Badge plate realizes that air door 3 is latched.When a wherein air door, such as when air door 2 is closed, the control dress of the closing triggering air door 2 of air door
It sets, the air inlet and gas outlet for controlling locking unit disconnect, to close the air supply channel of 3 passage cylinder of air door, passage cylinder
Air door snap-gauge is no longer pushed, air door 3 is opened.
In normal state, since the air inlet of the locking unit of two pectinid doors and gas outlet are completely in off-state,
Air door snap-gauge is withdrawn, and two pectinid doors are first opened any one fan and are ok.As long as opening any one fan, will trigger mechanism movement,
Make the air door snap-gauge of another Yishanmen start to act, prevents another group of air door from opening, avoid Air escape branch, ensure that ventilating system
Safety and reliability.
As illustrated in fig. 1 and 2, each air door 2,3 includes first door leaf 21,31, second in one of the embodiments,
Door leaf 22,32, the locking unit 4 include the first operated pneumatic valve 41, the second operated pneumatic valve 42, and the air inlet pipe 1 is respectively and often
The air inlet connection of the air inlet, second operated pneumatic valve 42 of first operated pneumatic valve 41 of a locking unit；
The gas outlet of first operated pneumatic valve 41 of the locking unit 4 of each air door, second operated pneumatic valve
42 gas outlet is connected to the passage cylinder 5 of another air door respectively；
The control device of each air door includes the triggering that opens or closes by the first door leaf 21,31, control
Make the air inlet of first operated pneumatic valve 41 and the first controller of gas outlet on-off and by second door leaf 22,32
Open or close triggering, control the air inlet of second operated pneumatic valve 42 and the second controller of gas outlet on-off.
Specifically, each air door includes two door leafs, and opening or closing for each door leaf can trigger corresponding control respectively
Device controls the air inlet and gas outlet on-off of corresponding operated pneumatic valve.For example, when air door 2 opens first door leaf 21,
The air inlet that first door leaf 21 can trigger the first operated pneumatic valve 41 in the first controller control blocking device is connected to gas outlet, this
The gas source of Shi Huiyou 50% enters the passage cylinder of air door 3 by escape pipe 6, acts it slightly.It is beaten when in air door 2
When opening the second door leaf 22, the second door leaf 22 can trigger second controller control blocking device in the second operated pneumatic valve 42 into
Port is connected to gas outlet, and the gas source for having other 50% at this time passes through the passage cylinder that escape pipe 6 enters air door 3, this moment gas
Source passes through the passage cylinder that air inlet pipe 1 enters air door 3 completely, makes its full action, puts down snap-gauge, and air door 3 is prevented to open.
The locking unit 4 further includes third operated pneumatic valve 43, the 4th operated pneumatic valve 44 in one of the embodiments,
The gas outlet of 4th operated pneumatic valve 44 is communicated with the atmosphere, the third pneumatic operated valve of the locking unit 4 of each air door
The air inlet of door 43 is connected to the passage cylinder 5 of another air door, the 4th gas of the locking unit 4 of each air door
The air inlet of movable valve 44 is connected to the gas outlet of the third operated pneumatic valve 43 of same air door.
Specifically, the gas outlet of the 4th operated pneumatic valve 44 is communicated with the atmosphere, i.e., by the gas outlet of the 4th operated pneumatic valve 44
As leakage port.It is connected to by third operated pneumatic valve 43 and the 4th operated pneumatic valve 44 with the passage cylinder 5 of another air door, thus will
The high pressure gas of 5 the inside of passage cylinder imports third operated pneumatic valve 43, the 4th operated pneumatic valve 44 by discharge pipe and imports atmosphere
In, to realize losing heart for passage cylinder 5.
The control device of each air door includes by the unlatching of the first door leaf in one of the embodiments,
Or triggering is closed, the air inlet for controlling first operated pneumatic valve is connected to gas outlet and controls the air inlet of four operated pneumatic valve
Mouth disconnects or controls the air inlet of first operated pneumatic valve with gas outlet and gas outlet disconnects and controls the described 4th pneumatically
The first controller that the air inlet of valve is connected to gas outlet and the triggering that opens or closes by second door leaf, control
The air inlet of second operated pneumatic valve be connected to gas outlet and control the third operated pneumatic valve air inlet and gas outlet it is disconnected
The air inlet and gas outlet for opening or controlling second operated pneumatic valve disconnect and control the air inlet of the third operated pneumatic valve
The second controller being connected to gas outlet.
Specifically, for example, second controller controls second in blocking device when air door 2 closes the second door leaf 22
The air inlet of operated pneumatic valve 42 and gas outlet disconnect, and stop gas supply, at the same second controller control third operated pneumatic valve 43 into
Port is connected to gas outlet, so that the third in the high pressure gas of 5 the inside of passage cylinder and the blocking device of air door 1 of air door 3
Pneumatic air door 43 is connected.When air door 2 closes first door leaf 21, the first control controls the air inlet of the first operated pneumatic valve 41 and goes out
Port disconnects, and stops gas supply, while the air inlet of the first controller the 4th operated pneumatic valve 44 of control is connected to gas outlet, at this time wind
The high pressure gas of the inside of passage cylinder 5 of door 2 can by air hose 6, third operated pneumatic valve 43, the 4th operated pneumatic valve 44 subsequently into
In atmosphere.
First operated pneumatic valve is the first two-position three-way valve, second operated pneumatic valve in one of the embodiments,
For the second two-position three-way valve, the third operated pneumatic valve is third two-position three-way valve, and the 4th operated pneumatic valve is the 4th two
Triple valve, the transposition valve body of first two-position three-way valve and the changing for the 4th two-position three-way valve of each control device
Position valve body is driven by the first slide bar, the transposition valve of the transposition valve body and the third two-position three-way valve of second two-position three-way valve
Body is driven by the second slide bar, and first controller is that the doorframe of air door is arranged in contact with first door leaf and with described first
First magnet of slide bar connection, the second controller are that the doorframe of air door is arranged in contact with the second door leaf and with described the
Second magnet of two slide bars connection.
Specifically, two-position three-way valve includes closed chamber, air inlet and two gas outlets is provided in different location, in chamber
Between be transposition valve body, block or leak out different gas outlets by the movement of control transposition valve body, and air inlet be it is normally opened,
Therefore, when slide bar drive transposition valve body it is mobile when, different gas outlets can be made to be connected to air inlet.In the present embodiment
In, the first gas outlet of two-position three-way valve can be closed, using the second gas outlet as the gas outlet of operated pneumatic valve.Then work as slide bar
Driving transposition valve body is mobile, and when so that air inlet being connected to the first gas outlet, as the air inlet of operated pneumatic valve and gas outlet are disconnected
It opens, and when slide bar driving transposition valve body is mobile, when so that air inlet being connected to the second gas outlet, the as air inlet of operated pneumatic valve
It is connected to gas outlet.
First magnet and the second magnet are separately positioned on the doorframe of the first air door and the doorframe of the second air door.Pass through door leaf
It opens or closes, squeezes the magnet on roof door frame, thus the movement of driving slider, and obtain the movement of corresponding transposition valve body.
It in one of the embodiments, further include pneumatic pressure regulation air filtration component 8, described air inlet pipe one end is respectively and described in two
The air inlet of the locking unit of air door is connected to, and the other end is connect by the pneumatic pressure regulation air filtration component with mine pressure ventilation system.
In one of the embodiments, further include the pressure gauge 9 and lubricating arrangement 10, the other end of the air inlet pipe according to
It is secondary to be connect by the lubricating arrangement, the pressure gauge, the pneumatic pressure regulation air filtration component with mine pressure ventilation system 12.
In view of underground particular surroundings, the sundries in periodic cleaning filter is wanted for the air door being commonly used, to guarantee
Into the distinguished and admirable pure of system, extend the service life of cylinder.Lubricating oil periodically is added to lubricating arrangement, to guarantee cylinder energy
Enough sensitive unlatchings.
Described air inlet pipe one end is closed with two air doors respectively by air inlet pipe threeway 11 in one of the embodiments,
The air inlet of lock unit is connected to.
It in one of the embodiments, further include the reset spring being connect with the air door snap-gauge.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (9)
1. a kind of pneumatic air door clamp plate type throttle locking device characterized by comprising air inlet pipe and:
The air door snap-gauge for being separately positioned on the passage cylinder of two pectinid doors and being driven by the passage cylinder；
Each air door is respectively arranged with locking unit, the air inlet pipe air inlet with the locking unit of two air doors respectively
Mouth connection, the gas outlet of the locking unit of each air door is connected to the passage cylinder of another air door；
It is additionally provided on each air door by the locking unit for opening or closing the triggering control air door of the air door
The control device that air inlet is connected to or disconnects with gas outlet.
2. pneumatic air door clamp plate type throttle locking device according to claim 1, which is characterized in that each air door packet
First door leaf, the second door leaf are included, the locking unit includes the first operated pneumatic valve, the second operated pneumatic valve, the air inlet pipe difference
It is connected to the air inlet of the air inlet of first operated pneumatic valve of each locking unit, second operated pneumatic valve；
The gas outlet of first operated pneumatic valve of the locking unit of each air door, second operated pneumatic valve gas outlet
It is connected to respectively with the passage cylinder of another air door；
The control device of each air door includes the triggering that opens or closes by the first door leaf, control described first
The air inlet of operated pneumatic valve and the first controller of gas outlet on-off and triggering is opened or closed by second door leaf,
Control the air inlet of second operated pneumatic valve and the second controller of gas outlet on-off.
3. pneumatic air door clamp plate type throttle locking device according to claim 2, which is characterized in that the locking unit is also
Including third operated pneumatic valve, the 4th operated pneumatic valve, the gas outlet of the 4th operated pneumatic valve is communicated with the atmosphere, each air door
The air inlet of the third operated pneumatic valve of locking unit be connected to the passage cylinder of another air door, each air door
The air inlet of the 4th operated pneumatic valve of locking unit be connected to the gas outlet of the third operated pneumatic valve of same air door.
4. pneumatic air door clamp plate type throttle locking device according to claim 3, which is characterized in that each air door
The control device includes the triggering that opens or closes by the first door leaf, control the air inlet of first operated pneumatic valve with
Gas outlet is connected to and controls the air inlet of four operated pneumatic valve and gas outlet disconnects or controls first operated pneumatic valve
Air inlet and gas outlet disconnect and control the first controller that the air inlet of the 4th operated pneumatic valve is connected to gas outlet and
By the triggering that opens or closes of second door leaf, the air inlet for controlling second operated pneumatic valve is connected to and controls with gas outlet
The air inlet of the third operated pneumatic valve and gas outlet disconnect or control air inlet and the gas outlet of second operated pneumatic valve
Disconnect and control the second controller that the air inlet of the third operated pneumatic valve is connected to gas outlet.
5. pneumatic air door clamp plate type throttle locking device according to claim 4, which is characterized in that first pneumatic operated valve
Door is the first two-position three-way valve, and second operated pneumatic valve is the second two-position three-way valve, and the third operated pneumatic valve is third two
Position three-way valve, the 4th operated pneumatic valve are the 4th two-position three-way valve, first two-bit triplet of each control device
The transposition valve body of valve and the transposition valve body of the 4th two-position three-way valve are driven by the first slide bar, second two-position three-way valve
The transposition valve body of transposition valve body and the third two-position three-way valve is driven by the second slide bar, and first controller is to be arranged in wind
The first magnet that the doorframe of door can be contacted with first door leaf and be connect with first slide bar, the second controller are that setting exists
The second magnet that the doorframe of air door can be contacted with the second door leaf and be connect with second slide bar.
6. pneumatic air door clamp plate type throttle locking device according to claim 1, which is characterized in that further include pneumatic pressure regulation
Air filtration component, described air inlet pipe one end are connected to the air inlet of the locking unit of two air doors respectively, and the other end passes through described
Pneumatic pressure regulation air filtration component is connect with mine pressure ventilation system.
7. pneumatic air door clamp plate type throttle locking device according to claim 6, which is characterized in that further include pressure gauge and
Lubricating arrangement, the other end of the air inlet pipe pass sequentially through the lubricating arrangement, the pressure gauge, the pneumatic pressure regulation air filtration group
Part is connect with mine pressure ventilation system.
8. pneumatic air door clamp plate type throttle locking device according to claim 1, which is characterized in that described air inlet pipe one end
It is connected to respectively with the air inlet of the locking unit of two air doors by air inlet pipe threeway.
9. pneumatic air door clamp plate type throttle locking device according to claim 1, which is characterized in that further include and the wind
The reset spring of badge plate connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820261155.4U CN208310832U (en) | 2018-02-22 | 2018-02-22 | A kind of pneumatic air door clamp plate type throttle locking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820261155.4U CN208310832U (en) | 2018-02-22 | 2018-02-22 | A kind of pneumatic air door clamp plate type throttle locking device |
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| Publication Number | Publication Date |
|---|---|
| CN208310832U true CN208310832U (en) | 2019-01-01 |
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ID=64720552
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820261155.4U Active CN208310832U (en) | 2018-02-22 | 2018-02-22 | A kind of pneumatic air door clamp plate type throttle locking device |
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| CN (1) | CN208310832U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110486076A (en) * | 2019-08-25 | 2019-11-22 | 滁州方大矿业发展有限公司 | A kind of coal mine air door automatic blocking control interstage valve |
-
2018
- 2018-02-22 CN CN201820261155.4U patent/CN208310832U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110486076A (en) * | 2019-08-25 | 2019-11-22 | 滁州方大矿业发展有限公司 | A kind of coal mine air door automatic blocking control interstage valve |
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