Pneumatic control system for full-time locking of mine air door

Abstract

The invention belongs to the field of pneumatic control, and discloses a pneumatic control system for full-time locking of a mine air door, which comprises an air cylinder for driving the air door to open and close and an air door control gas circuit connected with the air cylinder, the air door control air path comprises an air door outer side / inner side door opening control valve, a door closing control valve, an unlocking valve, an air cylinder execution valve, a locking signal valve, a locking execution valve and an air source processing device. The two independent air door control air paths are connected through a locking signal valve and a locking execution valve, and locking of the two doors is achieved. When no locking exists, a door opening pneumatic signal can smoothly reach the air cylinder execution valve through the locking execution valve to drive the air cylinder execution valve to reverse. When any air door is in an opening process, a closing process or a completely-opened locking state, the locking signal valve completes conversion of pneumatic signals, particularly, the gradually-reduced pneumatic signals in the closing process of the air door can be changed into more stable pneumatic signals, the more stable pneumatic signals are transmitted to the locking execution valve in time, transmission of opening pneumatic signals of the other air door is cut off, and the air door is locked. And full-time locking is realized.

Description

Technical Field

[0001] This invention belongs to the field of pneumatic control technology and relates to a pneumatic control system for all-time locking of mine air doors, which is applied to the locking of two air doors in a mine connecting roadway. Background Technology

[0002] In underground engineering projects such as mines, ventilation doors are typically installed between key connecting roadways, primarily serving the purposes of personnel and cargo transportation and ventilation network control. The stability and reliable locking of ventilation doors during operation are crucial to mine safety. With the development of pneumatic control technology, the opening method of ventilation doors has evolved from manual push-pull to automatic control via pneumatic or hydraulic systems, significantly improving passage efficiency. Simultaneously, the locking methods have also evolved from traditional mechanical locking to various types of locking systems, including pneumatic locking.

[0003] Most currently used pneumatic control damper systems can achieve interlocking in most situations, but interlocking failures can occur under certain circumstances, such as air supply interruption or during damper closure. These control systems lack an effective, real-time interlocking mechanism. If interlocking fails, and both dampers are opened simultaneously, it will cause airflow short-circuiting, resulting in airflow turbulence and potential safety hazards such as gas accumulation. Therefore, there is an urgent need for a pneumatic control system for real-time interlocking of mine dampers to improve mine safety. Summary of the Invention

[0004] In view of this, the purpose of this invention is to solve the problem of the lack of an effective full-time locking mechanism in the prior art, and to provide a pneumatic control system for full-time locking of mine air doors. By utilizing the changes in the air path state during the opening or closing of the air door, the locking signal valve transmits the locking signal, drives the locking execution valve, realizes the locking of the air door, and improves mine safety.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A pneumatic control system for the all-time locking of a mine ventilation door includes a cylinder for driving the opening and closing of the ventilation door and a ventilation control air circuit connected to the cylinder and controlling its operation. The damper control air circuit includes an outer damper opening control valve, an outer damper closing control valve, an inner damper opening control valve, an inner damper closing control valve, an unlocking valve, a cylinder actuation valve, a lockout signal valve, a lockout actuation valve, and an air source processing device. The air source processing device is located at the beginning of the damper control air path, providing a stable and clean air source for the entire control air path; Specifically, the air outlet of the air source processing device is connected to the air inlet of the cylinder actuator valve, the air inlet of the outer door opening control valve of the damper, the air inlet of the outer door closing control valve of the damper, the air inlet of the inner door opening control valve of the damper, the air inlet of the inner door closing control valve of the damper, the air inlet of the lockout signal valve, and the control port of the unlocking valve.

[0006] The outlets of the outer and inner opening control valves of the damper are connected to the inlet of the locking actuator valve via a three-way connector. The outlet of the locking actuator valve is then connected to the first control port of the cylinder actuator valve. This allows the pneumatic signal for opening the damper to be transmitted via the locking actuator valve to the cylinder actuator valve, driving the cylinder actuator valve to its first operating state, causing the cylinder to extend and thus opening the damper. The air outlets of the outer and inner closing control valves of the damper are connected to the second control port of the cylinder actuator valve via a three-way connector. This allows the closing pneumatic signal to be directly transmitted to the cylinder actuator valve, driving it to the second operating state, causing the cylinder to retract and closing the damper. The first outlet of the cylinder actuator valve is connected to the rodless chamber interface of the cylinder and the control port of the lock-up signal valve via a three-way connector, and the second outlet is connected to the inlet of the unlocking valve; the outlet of the unlocking valve is connected to the rod chamber interface of the cylinder. Furthermore, the unlocking valve has an automatic unlocking function. When the air supply is sufficient, it maintains a certain air pressure in the rod chamber of the cylinder to keep the damper tightly closed; when the air supply is interrupted, it automatically depressurizes, allowing the damper to be manually pushed.

[0007] The pneumatic control system for full-time locking of mine ventilation doors according to the present invention has two ventilation door control air paths, which drive two cylinders respectively, and the two ventilation door control air paths have independent and joint locking control.

[0008] In the two damper control air circuits, the outlet of the interlocking signal valve is connected to the control port of the interlocking execution valve.

[0009] Specifically, the locking signal valve is a two-position three-normally-off pneumatic control valve. During the opening process and when the damper is fully open, it can convert the pneumatic signal from the first outlet of the cylinder actuator valve into a stable pneumatic signal and transmit it to the locking actuator valve of the other damper control air path. During the closing process, it can also convert the gradually decreasing pneumatic signal discharged from the rodless chamber of the cylinder into a stable pneumatic signal and transmit it to the locking actuator valve of the other damper control air path.

[0010] Specifically, the locking actuator is a two-position three-normal-flow pneumatic control valve. When no locking signal is received, it can smoothly transmit the opening signal to the cylinder actuator to open the damper. When a locking signal is received, it cuts off the transmission of the opening signal to prevent the damper from opening. Specifically, the cylinder actuator valve is a two-position five-way dual-control pneumatic valve, which is equipped with a throttling speed control valve to control the opening and closing speed of the damper.

[0011] Specifically, the unlocking valve is a two-position three-normally shut-off air control valve; Specifically, the outer door opening control valve, the outer door closing control valve, the inner door opening control valve, and the inner door closing control valve are all two-position two-way self-resetting mechanical push-button valves. When pressed, they output the corresponding pneumatic signal, and when released, they automatically reset.

[0012] Specifically, the gas source processing device is a pneumatic dual unit with pressure regulation and filtration functions.

[0013] Specifically, the cylinder is a standard linear piston cylinder, which is connected to the damper opening and closing mechanism.

[0014] The present invention discloses a pneumatic control system for full-time locking of mine ventilation doors, wherein the outer door opening control valve, the outer door closing control valve, the inner door opening control valve, the inner door closing control valve, the unlocking valve, the cylinder actuation valve, the locking signal valve, and the locking actuation valve are all pneumatic valves, and full-time locking of the two ventilation doors is achieved through pneumatic signals during the entire process of opening and closing the ventilation doors.

[0015] The beneficial effects of this invention are as follows: 1. This invention utilizes pneumatic signal transmission during the opening and closing of airlocks to control the interlocking valve, promptly cutting off the corresponding air passage and achieving interlocking between two airlocks. Specifically, during the airlock closing process, the pneumatic signal transmitted to the interlocking signal valve gradually decreases. This invention, through signal valve conversion, transforms the gradually decreasing pneumatic signal into a stable pneumatic signal, using weak air pressure to drive stable air pressure, thus achieving stable transmission of the interlocking signal, enhancing the reliability of airlocking, and effectively solving the interlocking requirements of mine airlocks across multiple states.

[0016] 2. This invention employs a dual-control pneumatic path design to ensure the independent control of each damper, preventing gas source fluctuations from affecting the overall interlocking. During the opening control process, the stable air pressure output by the cylinder actuator directly triggers the interlocking signal valve, stably transmitting the interlocking signal and ensuring timely interlocking. During the closing control process, the switching function of the interlocking signal valve processes the gradually changing pneumatic signal, ensuring that the interlocking actuator can respond even at a distance, enhancing the system's robustness. Furthermore, when the gas source is interrupted, the unlocking valve allows manual operation of the damper, ensuring emergency passage, while the damper remains tightly closed when the gas source is sufficient to prevent accidental interference, improving mine safety. The system's cylinder actuator can be equipped with a throttling speed control valve to regulate the opening and closing speed, reducing mechanical impact and extending component life.

[0017] Overall, this invention achieves full-time interlocking by optimizing airflow connections and signal conversion, covering the opening, closing, and fully open states of the ventilation doors. This avoids the potential for interlocking failure in existing technologies, effectively prevents safety accidents such as airflow short circuits, and improves the stability of the mine ventilation network. Practical verification has shown that this system can significantly improve underground operation efficiency, reduce maintenance costs, and provide reliable assurance for safe mine production.

[0018] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the pneumatic control system for the full-time locking of mine ventilation doors in this invention.

[0020] Reference numerals: 1-First locking signal valve, 2-First locking actuator valve, 3-First damper outer opening control valve, 4-First damper outer closing control valve, 5-First air source treatment device, 6-First damper inner closing control valve, 7-First damper inner opening control valve, 8-First cylinder actuator valve, 9-First unlocking valve, 10-First cylinder, 11-Second locking signal valve, 12-Second locking actuator valve, 13-Second damper outer opening control valve, 14-Second damper outer closing control valve, 15-Second air source treatment device, 16-Second damper inner closing control valve, 17-Second damper inner opening control valve, 18-Second cylinder actuator valve, 19-Second unlocking valve, 20-Second cylinder. Detailed Implementation

[0021] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0022] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0023] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0024] Example 1 like Figure 1 The diagram shows a pneumatic control system for a mine ventilation door with full-time locking. It includes a first cylinder 10 and a second cylinder 20 that drive the opening and closing of the ventilation door, as well as a first ventilation door control air path and a second ventilation door control air path connected to and controlling the cylinders' operation. The first ventilation door control air path includes a first locking signal valve 1, a first locking execution valve 2, a first ventilation door outer opening control valve 3, a first ventilation door outer closing control valve 4, a first air source processing device 5, a first ventilation door inner closing control valve 6, a first ventilation door inner opening control valve 7, a first cylinder execution valve 8, and a first unlocking valve 9. The second ventilation door control air path has the same structure and includes a second locking signal valve 11, a second locking execution valve 12, a second ventilation door outer opening control valve 13, a second ventilation door outer closing control valve 14, a second air source processing device 15, a second ventilation door inner closing control valve 16, a second ventilation door inner opening control valve 17, a second cylinder execution valve 18, and a second unlocking valve 19.

[0025] As a preferred embodiment, the first damper outer opening control valve 3, the first damper outer closing control valve 4, the first damper inner opening control valve 7, and the first damper inner closing control valve 6 are all two-position two-way self-resetting mechanical push-button valves; the first unlocking valve 9, the first locking signal valve 1, the second unlocking valve 19, and the second locking signal valve 11 are two-position three-way normally closed pneumatic control valves; the first locking actuator valve 2 and the second locking actuator valve 12 are two-position three-way normally open pneumatic control valves; the first cylinder actuator valve 8 and the second cylinder actuator valve 18 are two-position five-way dual-control pneumatic control valves; the first air source processing device 5 and the second air source processing device 15 are pneumatic dual units; and the first cylinder 10 and the second cylinder 20 are standard linear piston cylinders.

[0026] This section uses the first damper control air path as an example for explanation; the second damper control air path should be followed accordingly.

[0027] The first air source processing device 5 provides a stable and clean air source for the first air damper control air path.

[0028] In the first air valve control air circuit, the external air source passes through the first air source processing device 5 and reaches the air inlet of the cylinder actuator valve 8, the first air valve outer side opening control valve 3, the first air valve inner side opening control valve 7, the first air valve outer side closing control valve 4, the first air valve inner side closing control valve 6, the first lock signal valve 1, and the control port of the first unlock valve 9.

[0029] When the air supply is interrupted, the first unlocking valve 9 is normally closed. When the air damper is pushed by hand, the gas in the cylinder can be discharged through the unlocking valve, thereby opening the air damper. When the air supply is sufficient, the first unlocking valve 9 is in the air-venting state. At this time, the air supply can reach the rodless chamber of the cylinder, keeping the air damper tightly closed.

[0030] If the door needs to be opened, press the outer door opening control valve 3 or the inner door opening control valve 7 of the first air door. The pneumatic signal reaches the first control port of the first cylinder actuator valve 8 through the first locking actuator valve 2, driving the first cylinder actuator valve 8 to the first working state. At this time, the air source enters the rodless chamber of the first cylinder 10 through the first outlet of the cylinder actuator valve, and the first cylinder 10 extends to control the opening of the first air door. During the opening process and in the fully open state, the pneumatic signal from the first outlet of the first cylinder actuator valve 8 enters the control port of the first locking signal valve 1 through the three-way connector, driving the first locking signal valve 1 to transmit the locking signal to the control port of the second locking actuator valve 12, cutting off the pneumatic signal path for opening the second air door. At this time, even if the outer door opening control valve 3 or the inner door opening control valve 7 of the first air door is pressed, the opening signal cannot be transmitted to the second cylinder actuator valve 18, and the second air door cannot be opened, thus achieving locking.

[0031] To close the door, press the outer door closing control valve 4 or the inner door closing control valve 6 of the first air damper. The pneumatic signal directly reaches the second control port of the first cylinder actuator valve 8, driving the first cylinder actuator valve 8 to the second working state. At this time, the air source enters the rod chamber of the first cylinder 10 through the second air outlet of the cylinder actuator valve, and the first cylinder retracts, controlling the first air damper to close. During the closing process of the air damper, air enters the rod chamber and exhausts from the rodless chamber. At this time, the locking signal valve converts the gradually decreasing gas signal discharged from the rodless chamber into a stable locking signal and transmits it to the control port of the second locking actuator valve 12, thereby achieving locking in the same way.

[0032] The entire pneumatic control system for the mine air doors' all-time locking is composed of pneumatic valves. It achieves all-time locking of the two air doors through pure pneumatic signals throughout the entire process of air door opening and closing control, and is suitable for ventilation safety in mine connecting roadways.

[0033] Once any damper is completely closed, the air pressure at the control port of the interlock signal valve disappears, and the interlock on the other damper is automatically released.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A pneumatic control system for all-time locking of mine ventilation doors, characterized in that: Includes a cylinder that drives the opening and closing of the damper and a damper control air circuit connected to the cylinder and controlling its operation; The damper control air circuit includes an outer damper opening control valve, an outer damper closing control valve, an inner damper opening control valve, an inner damper closing control valve, an unlocking valve, a cylinder actuation valve, a lockout signal valve, a lockout actuation valve, and an air source processing device. The air source processing device is located at the beginning of the damper control air path, providing a stable and clean air source for the entire control air path; The air outlet of the air source processing device is connected to the air inlet of the cylinder actuator valve, the air inlet of the outer door opening control valve of the damper, the air inlet of the outer door closing control valve of the damper, the air inlet of the inner door opening control valve of the damper, the air inlet of the inner door closing control valve of the damper, the air inlet of the lock signal valve, and the control port of the unlocking valve. The air outlets of the outer door opening control valve and the inner door opening control valve are connected to the air inlet of the locking actuator valve through a three-way connector. The air outlet of the locking actuator valve is then connected to the first control port of the cylinder actuator valve. The door opening pneumatic signal is transmitted to the cylinder actuator valve through the locking actuator valve, driving the cylinder actuator valve to the first working state. The cylinder extends, realizing the opening of the door. The air outlets of the outer and inner closing control valves of the damper are connected to the second control port of the cylinder actuator valve via a three-way connector. The closing pneumatic signal is transmitted to the cylinder actuator valve, which drives the cylinder actuator valve to the second working state. The cylinder retracts, thus closing the damper. The first outlet of the cylinder actuator valve is connected to the rodless chamber interface of the cylinder and the control port of the lock-up signal valve via a three-way connector, and the second outlet is connected to the inlet of the unlocking valve; the outlet of the unlocking valve is connected to the rod chamber interface of the cylinder; when the air supply is sufficient, the unlocking valve maintains a certain air pressure in the rod chamber of the cylinder to keep the damper tightly closed; when the air supply is interrupted, the unlocking valve automatically depressurizes, allowing the damper to be manually pushed.

2. The pneumatic control system for full-time locking of mine ventilation doors according to claim 1, characterized in that: The cylinder and damper control air circuits are two in number, with each cylinder connected to a corresponding damper. The two damper control air circuits are connected by an air pipe to achieve independent or interlocked control of the two dampers.

3. The pneumatic control system for full-time locking of mine ventilation doors according to claim 2, characterized in that: In the two damper control air circuits, the outlet of the interlocking signal valve is connected to the control port of the interlocking execution valve; The locking signal valve is a two-position, three-normally-off pneumatic control valve. Its outlet is connected to the control port of the locking actuator valve in another damper control air circuit. It transmits the pneumatic signal of the damper opening as a locking signal to the locking actuator valve in the other damper control air circuit to prevent the other damper from opening and achieve locking. During the damper opening process and when it is fully open, the locking signal valve converts the pneumatic signal from the first outlet of the cylinder actuator valve into a stable pneumatic signal and transmits it to the locking actuator valve in the other damper control air circuit. During the damper closing process, the locking signal valve also converts the gradually decreasing pneumatic signal discharged from the rodless chamber of the cylinder into a stable pneumatic signal and transmits it to the locking actuator valve in the other damper control air circuit. The locking actuator is a two-position three-normal-flow pneumatic control valve. Its inlet receives opening signals from the outer door opening control valve and the inner door opening control valve. When the locking actuator does not receive a locking signal, it remains in a normally open state and transmits the opening signal to the first control port of the cylinder actuator valve to open the door. When the locking actuator receives a locking signal, it cuts off the transmission of the opening signal to prevent the door from opening and achieves locking.

4. The pneumatic control system for all-time locking of mine ventilation doors according to claim 3, characterized in that: The cylinder actuator valve is a two-position five-way dual-control pneumatic valve. During the opening control process, its first control port receives the door opening signal output by the locking actuator valve and then switches to the first working state to control the cylinder to extend. During the closing control process, its second control port receives the door closing control valve signal from the inner side of the damper and the door closing control valve signal from the outer side of the damper and then switches to the second working state to control the cylinder to retract.

5. The pneumatic control system for full-time locking of mine ventilation doors according to claim 1, characterized in that: The unlocking valve is a two-position three-normal shut-off air control valve.

6. The pneumatic control system for all-time locking of mine ventilation doors according to claim 1, characterized in that: The outer door opening control valve, the outer door closing control valve, the inner door opening control valve, and the inner door closing control valve are all two-position two-way self-resetting mechanical push-button valves. When pressed, they output a pneumatic signal, and when released, they automatically reset.

7. The pneumatic control system for full-time locking of mine ventilation doors according to claim 1, characterized in that: The air source processing device is a pneumatic dual unit that continuously provides a stable, filtered and regulated air source to the air inlet of the cylinder actuator valve, the air inlet of the outer door opening control valve, the air inlet of the outer door closing control valve, the air inlet of the inner door opening control valve, the air inlet of the inner door closing control valve, the air inlet of the lockout signal valve, and the control port of the unlocking valve throughout the entire opening and closing control process.

8. The pneumatic control system for full-time locking of mine ventilation doors according to claim 1, characterized in that: The cylinder is a standard linear piston cylinder, which is connected to the damper opening and closing mechanism.

9. The pneumatic control system for full-time locking of mine ventilation doors according to claim 1, characterized in that: The cylinder actuator valve is equipped with a throttle speed control valve located on its intake and exhaust paths. During the opening and closing control process, it regulates the intake and exhaust flow rates and controls the speed at which the damper opens and closes.

10. The pneumatic control system for all-time locking of mine ventilation doors according to claim 2, characterized in that: The air source processing devices in the two damper control air paths are independent of each other, and provide filtered and pressure-regulated air sources during the opening and closing control of their respective dampers, so as to avoid the impact of single-path air source fluctuations on the overall interlocking function.

11. The pneumatic control system for full-time locking of mine ventilation doors according to claim 2, characterized in that: The outer door opening control valve, outer door closing control valve, inner door opening control valve, inner door closing control valve, unlocking valve, cylinder actuation valve, locking signal valve, and locking actuation valve are all pneumatic valves. They achieve full-time locking of the two doors throughout the entire process of door opening and closing control through pneumatic signals.

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