CN212508396U - HA mine air door pneumatic control system - Google Patents
HA mine air door pneumatic control system Download PDFInfo
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- CN212508396U CN212508396U CN202020952766.0U CN202020952766U CN212508396U CN 212508396 U CN212508396 U CN 212508396U CN 202020952766 U CN202020952766 U CN 202020952766U CN 212508396 U CN212508396 U CN 212508396U
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Abstract
The utility model discloses a HA mine air door pneumatic control system, which comprises a main gas circuit, a first air door control gas circuit, a first pedestrian door control gas circuit, a second air door control gas circuit and a second pedestrian door control gas circuit which are respectively connected with the main gas circuit, the main gas path comprises a gas inlet main valve arranged at a gas source inlet and a gas source processing element connected with the gas inlet main valve through a gas path, a gas source enters the gas source processing element through the gas inlet main valve and is conveyed to the whole system after being filtered, the opening and the mutual locking of the front air door and the rear air door can be realized by utilizing compressed air under a mine with an air source, namely, one air door is opened while the other air door is locked by air pressure, and meanwhile, the system integrates the locking of the pedestrian door, when interlocking two air doors, the pedestrian doors are also interlocked, so that the problem that the pedestrian doors are not locked is effectively solved, and the two air doors are prevented from being opened simultaneously to cause the short circuit of a mine ventilation system.
Description
Technical Field
The utility model belongs to the technical field of the mine air door, especially, relate to a HA mine air door pneumatic control system.
Background
With the construction of modern mines, air doors become core equipment in a ventilation system of a coal mine, and the management difficulty of the ventilation system is determined by whether the air doors are stable in operation and whether the locking performance is good. At present, the main door leaf of the pneumatic air door is pushed by the air cylinder to realize automatic opening and closing and mutual locking, the main supply of vehicles passes, and the standard pedestrian door on the main door leaf supplies a small amount of pedestrians to come in and go out at ordinary times and is manually opened and closed, so that mutual locking is realized. Under the condition of ensuring normal operation in a system, the two air door main door leaves and the standard pedestrian door leaves on the two air door main door leaves are locked together, so that the stability of a coal mine ventilation system is improved, and the system becomes a new concern.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a HA mine air door pneumatic control system can utilize compressed air to realize opening and shutting each other of front and back twice air door in the mine that HAs the air supply down, another door is died by the atmospheric pressure lock when opening a door promptly, and this system HAs integrated the shutting of pedestrian's door simultaneously, in interlocking twice air door, with pedestrian's door also interlocking, HAs effectively solved the problem that pedestrian's door does not shut, prevents that twice air door from opening simultaneously and causing the short circuit of mine ventilation system.
In order to achieve the purpose of the utility model, the technical proposal is as follows:
as shown in fig. 1, an HA mine air door pneumatic control system comprises a main air path, and a first air door control air path, a first pedestrian door control air path, a second air door control air path and a second pedestrian door control air path which are respectively connected with the main air path, wherein the main air path comprises an air inlet main valve installed at an air source inlet and an air source processing element connected with the air inlet main valve through an air path, and an air source enters the air source processing element through the air inlet main valve, is filtered and then is delivered to the whole system;
the first air door control air path comprises a first pilot valve, a first air door outer side switch control valve, a first air door inner side switch control valve, a first execution valve, a first closing valve, a first reset valve, a second execution valve, a first adjustable throttle valve and a first air cylinder, the first pilot valve, the second execution valve and the first reset valve are respectively connected with the air source processing element through air paths, the first pilot valve is respectively connected with the first air door outer side switch control valve and the first air door inner side switch control valve through air paths, the first air door outer side switch control valve and the first air door inner side switch control valve are respectively connected with the first execution valve through air paths, the first execution valve is connected with the second execution valve through a first control air path main channel, the second execution valve is connected with the first adjustable throttle valve through air paths, the first adjustable throttle valve is respectively connected with the first closing valve and the first air cylinder through air paths, the first air cylinder is connected with the first air door and controls the action of the first air cylinder;
the first pedestrian door control gas circuit comprises a third execution valve, a first one-way tee joint, a first stroke valve, a first thin cylinder and a first three-way valve, the third execution valve and the first stroke valve are respectively connected with the gas source processing element through gas circuits, the first one-way tee joint is respectively connected with the third execution valve and the first thin cylinder through the gas circuits, the third execution valve is connected with the first execution valve through the gas circuits, the first thin cylinder is connected with the first pedestrian door and controls the action of the first pedestrian door, the first pedestrian door is arranged on the first air door, and the first stroke valve is connected with the first three-way valve through a first pedestrian door interlocking gas circuit;
the second air door control air path comprises a second pilot valve, a second air door outer side switch control valve, a second air door inner side switch control valve, a fourth execution valve, a second closing valve, a second reset valve, a fifth execution valve, a second adjustable throttle valve and a second air cylinder, the second pilot valve, the fifth execution valve and the second reset valve are respectively connected with the air source processing element through air paths, the second pilot valve is respectively connected with the second air door outer side switch control valve and the second air door inner side switch control valve through air paths, meanwhile, the second pilot valve is connected with the second pilot valve through a first interlocking air path channel, the second air door outer side switch control valve and the second air door inner side switch control valve are respectively connected with the fourth execution valve through air paths, the second control air path main channel is connected with the first one-way tee joint through air paths, and the fourth execution valve is connected with the second adjustable throttle valve through air paths, the second adjustable throttle valve is respectively connected with a second locking valve and a second air cylinder through an air path, the second air cylinder is connected with a second air door and controls the action of the second air door, and the second locking valve is connected with the first pilot valve through a second interlocking air path channel;
the second pedestrian door control gas circuit comprises a sixth execution valve, a second one-way tee joint, a second stroke valve, a second thin cylinder and a second three-way valve, the sixth execution valve and the second stroke valve are respectively connected with the air source processing element through air passages, the second one-way tee joint is respectively connected with the sixth execution valve and the second thin cylinder through the air passages, the sixth execution valve is connected with the fourth execution valve through the air passages, meanwhile, a sixth execution valve is connected with a second three-way valve through an air passage, a second thin cylinder is connected with a second pedestrian door and controls the action of the second pedestrian door, meanwhile, the second one-way tee joint is connected with the first control gas path main channel through a gas path, the second pedestrian door is arranged on the second air door, the second travel valve is connected with the second three-way valve through a second pedestrian door interlocking gas path, the first three-way valve is respectively connected with the first execution valve, the third execution valve and the first reset valve through the gas path, and the second reset valve is connected with the second three-way valve through the gas path.
When the switch control valve at the outer side of the first air door or the switch control valve at the inner side of the first air door is opened, the main channel of the first control air path is communicated, at the moment, the second execution valve connected with the main channel of the first control air path is reversed to convey an air source to the tail part of the first air cylinder, and the first air cylinder rod is pushed out to control the opening of the first air door; meanwhile, the air source is conveyed to the first locking valve to change the direction of the first locking valve, and the air path of the second pilot valve is cut off, so that the main channel of the second control air path can not supply air, and the second air door can not be opened; in addition, through the switch-on of the second one-way tee bend that the gas circuit links to each other with first control gas circuit main entrance for the slim jar of second stretches out and pins the second pedestrian's door, thereby realizes when first air door is opened, and second air door, second pedestrian's door are all pinned, prevent that two air doors from opening simultaneously and causing the ventilation short circuit, otherwise, when the second air door is opened the same reason.
When the first pedestrian door is manually opened, the first stroke valve resets, the interlocking gas circuit of the first pedestrian door is communicated, at the moment, the fourth execution valve is reversed to cut off the main channel of the second control gas circuit, the second cylinder is in a closed state to forbid the opening of the second air door, meanwhile, the sixth execution valve is reversed to be communicated with the second one-way tee joint, the second thin cylinder extends out to forbid the opening of the second pedestrian door, so that when the first pedestrian door is opened, the second air door and the second pedestrian door are both locked to prevent the ventilation short circuit caused by the opening of the second pedestrian door, otherwise, the operation is the same when the second pedestrian door is opened.
The first pedestrian door and the second pedestrian door are manually opened and closed, when the first pedestrian door is not tightly closed, the opening of the second air door is affected, the second reset valve can be pressed down, the second three-way valve is reversed, the interlocking air circuit of the first pedestrian door is further cut off, the fourth execution valve and the sixth execution valve are unlocked, and the second air door is smoothly opened to achieve the purpose of remote unlocking.
Preferably, the pneumatic control system for the mine air door further comprises a first one-way throttle valve and a second one-way throttle valve with an exhaust function, and the first one-way throttle valve and the second one-way throttle valve are respectively connected with the first control air path main channel and the second control air path main channel.
Preferably, the first pilot valve and the second pilot valve are pneumatic control two-position three-way pilot valves.
Preferably, the first, third, fourth and sixth execution valves are pneumatically-controlled two-position three-way execution valves.
Preferably, the first locking valve and the second locking valve are pneumatic control small two-position five-way locking valves.
Preferably, the second execution valve and the fifth execution valve are pneumatic control large two-position five-way execution valves.
Preferably, the first three-way valve and the second three-way valve are pneumatically controlled two-position three-way valves.
The utility model has the advantages that: the utility model discloses the system constitutes the novelty, has accomplished entire system through using a small amount of pneumatic element and other auxiliary assembly and has constituteed, belongs to forward position development system in the air door system control of the same kind, and this system is in accord with under the prerequisite that the steady operation air door was opened, effectively solves the requirement that big or small air door together locked in the ventilation of modern mine, and system performance is stable, and easy the maintenance and repair rate are less.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example 1
A HA mine air door pneumatic control system comprises a main air path, and a first air door control air path, a first pedestrian door control air path, a second air door control air path and a second pedestrian door control air path which are respectively connected with the main air path, wherein the main air path comprises an air inlet main valve 1 arranged at an air source inlet and an air source processing element 2 connected with the air inlet main valve 1 through an air path, and an air source enters the air source processing element 2 through the air inlet main valve 1, is filtered and then is conveyed to the whole system;
the first air door control air path comprises a first pilot valve 4, a first air door outer side switch control valve 5, a first air door inner side switch control valve 6, a first execution valve 7, a first locking valve 8, a first reset valve 9, a second execution valve 10, a first adjustable throttle valve 11 and a first air cylinder 12, wherein the first pilot valve 4, the second execution valve 10 and the first reset valve 9 are respectively connected with the air source processing element 2 through air paths, the first pilot valve 4 is respectively connected with the first air door outer side switch control valve 5 and the first air door inner side switch control valve 6 through air paths, the first air door outer side switch control valve 5 and the first air door inner side switch control valve 6 are respectively connected with the first execution valve 7 through air paths, the first execution valve 7 is connected with the second execution valve 10 through a first control air path main channel, the second execution valve 10 is connected with the first adjustable throttle valve 11 through air paths, and the first adjustable throttle valve 11 is respectively connected with the first locking valve 8, the second execution valve 10 is connected with the first air path, The first cylinder 12 is connected with the first air door, and the first cylinder 12 is connected with the first air door and controls the action of the first air door;
the first pedestrian door control gas circuit comprises a third execution valve 13, a first one-way tee 14, a first stroke valve 15, a first thin cylinder 16 and a first three-way valve 31, the third execution valve 13 and the first stroke valve 15 are respectively connected with the gas source processing element 2 through gas circuits, the first one-way tee 14 is respectively connected with the third execution valve 13 and the first thin cylinder 16 through gas circuits, the third execution valve 13 is connected with the first execution valve 7 through a gas circuit, the first thin cylinder 16 is connected with the first pedestrian door and controls the action of the first pedestrian door, the first pedestrian door is arranged on the first air door, and the first stroke valve 15 is connected with the first three-way valve 31 through a first pedestrian door interlocking gas circuit;
the second air door control air path comprises a second pilot valve 18, a second air door outer side switch control valve 19, a second air door inner side switch control valve 20, a fourth execution valve 21, a second locking valve 22, a second reset valve 23, a fifth execution valve 24, a second adjustable throttle valve 25 and a second air cylinder 26, the second pilot valve 18, the fifth execution valve 24 and the second reset valve 23 are respectively connected with the air source processing element 2 through air paths, the second pilot valve 18 is respectively connected with the second air door outer side switch control valve 19 and the second air door inner side switch control valve 20 through air paths, meanwhile, the second pilot valve 18 is connected with the second pilot valve 18 through a first interlocking air path channel, the second air door outer side switch control valve 19 and the second air door inner side switch control valve 20 are respectively connected with the fourth execution valve 21 through air paths, and the second control air path main channel is connected with the first one-way tee 14 through air paths, the fourth execution valve 21 is connected with a second adjustable throttle valve 25 through an air path, the second adjustable throttle valve 25 is respectively connected with a second locking valve 22 and a second air cylinder 26 through the air path, the second air cylinder 26 is connected with a second air door and controls the action of the second air door, and the second locking valve 22 is connected with the first pilot valve 4 through a second interlocking air path channel;
the second pedestrian valve control gas circuit comprises a sixth execution valve 27, a second one-way three-way valve 28, a second stroke valve 29, a second thin cylinder 30 and a second three-way valve 32, the sixth execution valve 27 and the second stroke valve 29 are respectively connected with the gas source processing element 2 through gas circuits, the second one-way three-way valve 28 is respectively connected with the sixth execution valve 27 and the second thin cylinder 30 through gas circuits, the sixth execution valve 27 is connected with the fourth execution valve 21 through a gas circuit, the sixth execution valve 27 is connected with the second three-way valve 32 through a gas circuit, the second thin cylinder 30 is connected with the second pedestrian valve and controls the action of the second pedestrian valve, the second one-way three-way valve 28 is connected with the first control gas circuit main channel through a gas circuit, the second pedestrian valve is arranged on the second air door, the second stroke valve 29 is connected with the second three-way valve 32 through a second pedestrian valve interlocking gas circuit, and the first three-way valve 31 is respectively connected with the first execution valve 7, the, The third execution valve 13 is connected with the first reset valve 9, and the second reset valve 23 is connected with the second three-way valve 32 through an air path.
Example 2
Based on the structure of embodiment 1, the pneumatic control system for the mine air door further comprises a first one-way throttle valve 3 and a second one-way throttle valve 17 which have an exhaust function, wherein the first one-way throttle valve 3 and the second one-way throttle valve 17 are respectively connected with a first control air path main channel and a second control air path main channel.
Example 3
Based on the structure of embodiment 1, the first pilot valve 4 and the second pilot valve 18 are pneumatically controlled two-position three-way pilot valves.
The first executive valve 7, the third executive valve 13, the fourth executive valve 21 and the sixth executive valve 27 are pneumatic control two-position three-way executive valves.
The first locking valve 8 and the second locking valve 22 are pneumatic control small two-position five-way locking valves.
The second and fifth execution valves 10 and 24 are pneumatic control large two-position five-way execution valves.
The first three-way valve 31 and the second three-way valve 32 are pneumatically controlled two-position three-way valves.
In this embodiment, the air source processing element 2 may adopt other air source processing elements 2 such as a triplet AC3000-03, and the present invention is not limited to this.
The working principle is as follows: when the switch control valve 5 at the outer side of the first air door or the switch control valve 6 at the inner side of the first air door is opened, the main channel of the first control air channel is communicated, at the moment, the second execution valve 10 connected with the main channel of the first control air channel is reversed to convey an air source to the tail part of the first air cylinder 12, and the first air cylinder 12 pushes out to control the opening of the first air door; meanwhile, the air source is conveyed to the first locking valve 8 to change the direction of the first locking valve, and the air path of the second pilot valve 18 is cut off, so that the main channel of the second control air path can not supply air, and further the second air door can not be opened; in addition, the second one-way tee 28 connected with the main channel of the first control air path through the air path is communicated, so that the second thin cylinder 30 extends out to lock the second pedestrian door, the second air door and the second pedestrian door are both locked when the first air door is opened, the two air doors are prevented from being opened simultaneously to cause ventilation short circuit, and otherwise, the operation is carried out in the same way when the second air door is opened.
When the first pedestrian door is manually opened, the first stroke valve 15 is reset, the interlocking gas circuit of the first pedestrian door is communicated, at the moment, the fourth execution valve 21 is reversed to cut off the main channel of the second control gas circuit, the second cylinder 26 is in a closed state to forbid the opening of the second air door, meanwhile, the sixth execution valve 27 is reversed to communicate the second one-way tee 28, the second thin cylinder 30 extends out to forbid the opening of the second pedestrian door, so that when the first pedestrian door is opened, the second air door and the second pedestrian door are both locked to prevent the ventilation short circuit caused by the opening of the second pedestrian door, otherwise, when the second pedestrian door is opened, the same is carried out.
The first pedestrian door and the second pedestrian door are manually opened and closed, when the first pedestrian door is not tightly closed, the opening of the second air door is affected, the second reset valve 23 can be pressed down, the second three-way valve 32 is reversed, the first pedestrian door is further enabled to be interlocked with the air circuit to be cut off, the fourth execution valve 21 and the sixth execution valve 27 are unlocked, and therefore the second air door is smoothly opened, and the purpose of remote unlocking is achieved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement or combination made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a HA mine air door pneumatic control system, includes total gas circuit and first air door control gas circuit, first pedestrian's door control gas circuit, second air door control gas circuit and the pedestrian's door control gas circuit of second that is connected with total gas circuit respectively, total gas circuit is including installing the main valve that admits air at the air supply entry and the air supply processing component who passes through the gas circuit with the main valve that admits air and be connected, and the air supply gets into air supply processing component through the main valve that admits air, carries for entire system, its characterized in that after filtering:
the first air door control air path comprises a first pilot valve, a first air door outer side switch control valve, a first air door inner side switch control valve, a first execution valve, a first locking valve, a first reset valve, a second execution valve, a first adjustable throttle valve and a first air cylinder, the first pilot valve, the second execution valve and the first reset valve are respectively connected with the air source processing element through air paths, the first pilot valve is respectively connected with the first air door outer side switch control valve and the first air door inner side switch control valve through air paths, the first air door outer side switch control valve and the first air door inner side switch control valve are respectively connected with the first execution valve through air paths, the first execution valve is connected with the second execution valve through a first control air path main channel, the second execution valve is connected with the first adjustable throttle valve through air paths, the first adjustable throttle valve is respectively connected with the first locking valve and the first air cylinder through air paths, the first air cylinder is connected with the first air door and controls the action of the first air cylinder;
the first pedestrian door control gas circuit comprises a third execution valve, a first one-way tee joint, a first stroke valve, a first thin cylinder and a first three-way valve, the third execution valve and the first stroke valve are respectively connected with the gas source processing element through gas circuits, the first one-way tee joint is respectively connected with the third execution valve and the first thin cylinder through the gas circuits, the third execution valve is connected with the first execution valve through the gas circuits, the first thin cylinder is connected with the first pedestrian door and controls the action of the first pedestrian door, and the first stroke valve is connected with the first three-way valve through a first pedestrian door interlocking gas circuit;
the second air door control air path comprises a second pilot valve, a second air door outer side switch control valve, a second air door inner side switch control valve, a fourth execution valve, a second closing valve, a second reset valve, a fifth execution valve, a second adjustable throttle valve and a second air cylinder, the second pilot valve, the fifth execution valve and the second reset valve are respectively connected with the air source processing element through air paths, the second pilot valve is respectively connected with the second air door outer side switch control valve and the second air door inner side switch control valve through air paths, meanwhile, the second pilot valve is connected with the second pilot valve through a first interlocking air path channel, the second air door outer side switch control valve and the second air door inner side switch control valve are respectively connected with the fourth execution valve through air paths, the second control air path main channel is connected with the first one-way tee joint through air paths, and the fourth execution valve is connected with the second adjustable throttle valve through air paths, the second adjustable throttle valve is respectively connected with a second locking valve and a second air cylinder through an air path, the second air cylinder is connected with a second air door and controls the action of the second air door, and the second locking valve is connected with the first pilot valve through a second interlocking air path channel;
the second pedestrian door control gas circuit comprises a sixth execution valve, a second one-way tee joint, a second stroke valve, a second thin cylinder and a second three-way valve, the sixth execution valve and the second stroke valve are respectively connected with the air source processing element through air passages, the second one-way tee joint is respectively connected with the sixth execution valve and the second thin cylinder through the air passages, the sixth execution valve is connected with the fourth execution valve through the air passages, meanwhile, a sixth execution valve is connected with a second three-way valve through an air passage, a second thin cylinder is connected with a second pedestrian door and controls the action of the second pedestrian door, meanwhile, the second one-way tee joint is connected with the first control gas path main channel through a gas path, the second stroke valve is connected with the second three-way valve through a second pedestrian door interlocking gas path, the first three-way valve is respectively connected with the first execution valve, the third execution valve and the first reset valve through gas paths, and the second reset valve is connected with the second three-way valve through a gas path.
2. The HA mine damper pneumatic control system of claim 1, wherein: when the switch control valve at the outer side of the first air door or the switch control valve at the inner side of the first air door is opened, the main channel of the first control air path is communicated, at the moment, the second execution valve connected with the main channel of the first control air path is reversed to convey an air source to the tail part of the first air cylinder, and the first air cylinder rod is pushed out to control the opening of the first air door; meanwhile, the air source is conveyed to the first locking valve to change the direction of the first locking valve, and the air path of the second pilot valve is cut off, so that the main channel of the second control air path can not supply air, and the second air door can not be opened; in addition, through the switch-on of the second one-way tee bend that the gas circuit links to each other with first control gas circuit main entrance for the slim jar of second stretches out and pins the second pedestrian's door, thereby realizes when first air door is opened, and second air door, second pedestrian's door are all pinned, prevent that two air doors from opening simultaneously and causing the ventilation short circuit, otherwise, when the second air door is opened the same reason.
3. The HA mine damper pneumatic control system of claim 1, wherein: when the first pedestrian door is manually opened, the first stroke valve resets, the interlocking gas circuit of the first pedestrian door is communicated, at the moment, the fourth execution valve is reversed to cut off the main channel of the second control gas circuit, the second cylinder is in a closed state to forbid the opening of the second air door, meanwhile, the sixth execution valve is reversed to be communicated with the second one-way tee joint, the second thin cylinder extends out to forbid the opening of the second pedestrian door, so that when the first pedestrian door is opened, the second air door and the second pedestrian door are both locked to prevent the ventilation short circuit caused by the opening of the second pedestrian door, otherwise, the operation is the same when the second pedestrian door is opened.
4. The HA mine damper pneumatic control system of claim 1, wherein: the first pedestrian door and the second pedestrian door are manually opened and closed, when the first pedestrian door is not tightly closed, the opening of the second air door is affected, the second reset valve can be pressed down, the second three-way valve is reversed, the interlocking air circuit of the first pedestrian door is further cut off, the fourth execution valve and the sixth execution valve are unlocked, and the second air door is smoothly opened to achieve the purpose of remote unlocking.
5. The HA mine damper pneumatic control system of claim 1, wherein: the mine air door pneumatic control system further comprises a first one-way throttle valve and a second one-way throttle valve which have an exhaust function, and the first one-way throttle valve and the second one-way throttle valve are respectively connected with the first control air path main channel and the second control air path main channel.
6. The HA mine damper pneumatic control system of claim 1, wherein: the first pilot valve and the second pilot valve are pneumatic control two-position three-way pilot valves.
7. The HA mine damper pneumatic control system of claim 1, wherein: the first execution valve, the third execution valve, the fourth execution valve and the sixth execution valve are pneumatic control two-position three-way execution valves.
8. The HA mine damper pneumatic control system of claim 1, wherein: the first locking valve and the second locking valve are pneumatic control small two-position five-way locking valves.
9. The HA mine damper pneumatic control system of claim 1, wherein: the second execution valve and the fifth execution valve are pneumatic control large two-position five-way execution valves.
10. The HA mine damper pneumatic control system of claim 1, wherein: the first three-way valve and the second three-way valve are pneumatic control two-position three-way valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020952766.0U CN212508396U (en) | 2020-05-29 | 2020-05-29 | HA mine air door pneumatic control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020952766.0U CN212508396U (en) | 2020-05-29 | 2020-05-29 | HA mine air door pneumatic control system |
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| Publication Number | Publication Date |
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| CN212508396U true CN212508396U (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020952766.0U Active CN212508396U (en) | 2020-05-29 | 2020-05-29 | HA mine air door pneumatic control system |
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| CN (1) | CN212508396U (en) |
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