Dampers pneumatic interlock

Abstract

The utility model discloses a kind of air door pneumatic interlocking device, belong to coal mine underground ventilation facility technical field. Including first air door and second air door, a set of pneumatic control assembly is equipped on each air door, including door buckle, door bolt, air cylinder, control air valve and gas pipeline. Door buckle is fixed in door frame, door bolt connects air cylinder piston rod and is aligned with it. Gas pipeline includes same gas source gas pipeline, first exhaust pipe and second exhaust pipe, realizes cross connection: the outlet of first air door control air valve is connected second air door cylinder by first exhaust pipe, the outlet of second air door control air valve is connected first air door cylinder by second exhaust pipe. Control air valve is linked with air door, when one air door opens, its control air valve opens, compressed air drives the cylinder of another air door, so that door bolt is inserted into door buckle and realizes locking;Air door is closed to reset control air valve, and release locking. By compressed air as power, discard easily worn mechanical components, high reliability, long life, low cost.

Description

Technical Field

[0001] This utility model belongs to the technical field of underground ventilation facilities in coal mines, and specifically relates to a pneumatic interlocking device for air doors. Background Technology

[0002] In underground coal mine ventilation systems, air doors are crucial ventilation facilities. Their function is to isolate or guide airflow, ensuring that fresh air flows to the working face along a predetermined route, while simultaneously expelling polluted air from the mine. To prevent airflow short-circuiting when personnel or vehicles pass through, the "Coal Mine Safety Regulations" mandate that at least two positively interlocked air doors must be installed in connecting roadways for pedestrians and vehicles, ensuring that these two air doors cannot be open simultaneously.

[0003] Currently, mechanical interlocking devices are commonly used in mines to achieve the interlocking function of air doors. Representative existing mechanical interlocking technologies mainly rely on gravity and spring reset principles, using mechanical components such as traction ropes and pulley systems for linkage. For example, a rotating bolt is installed on the rotating side of the air door, and two air doors are connected by a pull rope. When one air door is opened, the pull rope is pulled, causing the rotating bolt on the other air door to rotate under the tension, thus locking the door. However, existing mechanical air door interlocking devices generally have the following drawbacks: First, core transmission components (such as traction ropes and springs) are prone to aging, wear, and failure under long-term use and harsh working conditions, making it difficult to guarantee the reliability of the interlocking over time; second, the mechanical structure requires high installation precision and component fit, and even minor deviations or deformations can lead to interlocking failure. Utility Model Content

[0004] The purpose of this invention is to provide a pneumatic interlocking device for dampers, thereby improving the reliability and durability of damper interlocking.

[0005] The technical solution adopted in this utility model is: a pneumatic interlocking device for dampers, including a first damper and a second damper. Each damper is equipped with a pneumatic control assembly, which includes a door latch, a door bolt, a cylinder, a control valve, and an air supply pipeline. The door latch is fixed to the door frame of the damper; the door bolt is fixed to the door leaf of the damper and connected to the piston rod end of the cylinder; the door bolt and the door latch are aligned; the air supply pipeline includes a gas supply pipeline from the same air source, a first exhaust pipe, and a second exhaust pipe. The outlet of the control valve on the first damper is connected to the second damper via the first exhaust pipe. The cylinders are connected; the outlet of the control valve on the second damper is connected to the cylinder on the first damper through the second exhaust pipe; the inlet of the control valve on the first damper and the inlet of the control valve on the second damper are connected to the same air supply pipeline; the control valve is linked to the door leaf of the corresponding damper through the operating mechanism; when one damper is opened, its control valve is triggered to open, compressed air is delivered to the cylinder of the other damper, driving the door bolt to extend into the door latch to achieve locking; when the damper is closed, the control valve is reset, the cylinder returns to its position, the door bolt exits the door latch to release the locking.

[0006] Furthermore, the operating mechanism includes an operating handle installed on the damper frame and a pressure plate fixed to the damper leaf; the operating handle is rotatably installed on the damper frame, with one end being the driving end and the other end being the operating end. The driving end cooperates with the valve switch controlling the air valve, and the operating end cooperates with the pressure plate; and an elastic reset mechanism is provided between the operating handle and the damper frame; when the damper is closed, the pressure plate presses down on the operating end of the operating handle, and the driving end of the operating handle puts the valve switch in the open position; when the damper is opened, the pressure plate releases the operating end of the operating handle, and the driving end of the operating handle, under the action of the elastic reset mechanism, drives the valve switch to the closed position.

[0007] Furthermore, the operating lever includes an operating rod rotatably connected to the damper frame, one end of the operating rod is welded with a fork-shaped frame, and a rotating wheel that controls the valve switch of the air valve is installed on the fork-shaped frame; the other end of the operating rod is equipped with a pulley that cooperates with the pressure plate.

[0008] Furthermore, the control valve and the operating lever are fixed to the damper frame via a mounting bracket.

[0009] Furthermore, the mounting bracket is L-shaped, including a first upright plate and a second upright plate vertically welded to one side of the first upright plate; the control air valve is fixed to the first upright plate; a rotating fulcrum is welded to the first upright plate; the operating handle is installed on the rotating fulcrum and is rotatably connected to the first upright plate via the rotating fulcrum.

[0010] Furthermore, the elastic reset mechanism is a spring sleeve, including a sleeve and a telescopic spring disposed inside the sleeve. One end of the sleeve is welded to the second vertical plate, and the other end is provided with an opening for movably assembling the operating handle. The opening passes through the sleeve radially and extends axially. The operating handle is movably disposed on the spring sleeve, and the telescopic spring inside the spring sleeve is located between the second vertical plate and the operating handle.

[0011] Furthermore, the gas supply pipeline includes a main gas pipe, a first branch gas pipe, and a second branch gas pipe, and the main gas pipe is connected to the first branch gas pipe and the second branch gas pipe through a T-joint.

[0012] Furthermore, the cylinder is horizontally installed at the lower part of the damper door, and the door bolt is welded to the piston rod of the cylinder.

[0013] Furthermore, the door latch is a buckle or slot that matches the door bolt.

[0014] The beneficial effects of this utility model are as follows: This pneumatic interlocking device for dampers uses compressed air as a power source, which is less affected by mechanical wear, dust, and humidity. It fundamentally eliminates the easily worn and failed mechanical traction ropes of existing technologies, solving the core problems of poor reliability and short lifespan of mechanical interlocks, ensuring long-lasting and effective interlocking. Furthermore, using compressed air as a power source allows direct use of the existing compressed air pipelines in coal mines, eliminating the need for additional motors or hydraulic systems. This results in low cost, low energy consumption, and easy installation, making it particularly suitable for large-scale application in coal mine environments. The cylinder and bolt structures are also simple, facilitating installation and maintenance. Attached Figure Description

[0015] Figure 1 A schematic diagram of the installation of the pneumatic interlock device for the damper;

[0016] Figure 2 A schematic diagram showing the simultaneous closure of damper No. 1 and damper No. 2;

[0017] Figure 3 Diagram showing No. 1 damper closed and No. 2 damper open;

[0018] Figure 4 Diagram showing the No. 1 damper open and the No. 2 damper closed;

[0019] Figure 5 This is a top view of the spring sleeve;

[0020] Figure 6 Install the right view for the operating mechanism.

[0021] In the diagram, the components are: 1. Door latch; 2. Control valve; 2-1. Valve switch; 3. Door bolt; 4. Cylinder; 5. Air supply line from the same air source; 5. Main air pipe; 5-1. First branch air pipe; 5-2. Second branch air pipe; 5-3. T-connector; 5-4. First exhaust pipe; 6. Second exhaust pipe; 7. Pressure plate; 8. Operating handle; 9. Operating lever; 9-1. Fork frame; 9-2. Rotating wheel; 9-3. Pulley; 9-4. Mounting bracket; 10. First upright plate; 10-1. Second upright plate; 10-2. Spring sleeve; 12. Sleeve; 12-1. Telescopic spring; 12-2. Opening; 12-3. Rotating fulcrum; 13. Door frame; 14. Left upright frame; 14-1. Right upright frame; 14-2. Crossbeam; 14-3. Door leaf; 15. First air door A; Second air door B. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] In this specification, unless otherwise stated, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientation or positional relationship shown is for the purpose of describing the present invention only, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0024] Pneumatic interlock device for damper, such as Figures 1-4 As shown, it includes a first air door A and a second air door B. The first air door A and the second air door B adopt the same structure, that is, each of them is equipped with a set of pneumatic control components. The pneumatic control components include a door latch 1, a door bolt 3, a cylinder 4, a control valve 2, and an air supply pipeline.

[0025] The door latch 1 is fixed to the door frame of the damper. (See attached...) Figure 1 In the disclosed embodiments, the right vertical frame 14-2 of the door frame 14 is hinged to the door leaf, so the door latch 1 is usually fixed to the left vertical frame 14-1 of the door frame 14. Of course, the door latch 1 can also be fixed to the crossbeam 14-2. When the left vertical frame 14-1 of the door frame 14 is hinged to the door leaf, the door latch 1 is usually fixed to the right vertical frame 14-2 of the door frame 14. The following description assumes that the door latch 1 is fixed to the left vertical frame 14-1 of the door frame 14.

[0026] The bolt 3 is fixed to the door leaf 15 of the damper and connected to the piston rod end of the cylinder 4; the bolt 3 is aligned with the latch 1. Thus, when the piston rod of the cylinder 4 extends, it pushes the bolt 3 into the latch 1, locking the damper. When the piston rod of the cylinder 4 retracts, it causes the bolt 3 to disengage from the latch 1, releasing the damper from locking.

[0027] The gas supply pipeline includes a gas supply pipeline 5 with the same gas source, a first exhaust pipe 6, and a second exhaust pipe 7. The outlet of the control valve 2 on the first damper A is connected to the cylinder 4 on the second damper B through the first exhaust pipe 6; the outlet of the control valve 2 on the second damper B is connected to the cylinder 4 on the first damper A through the second exhaust pipe 7; the inlets of the control valve 2 on the first damper A and the control valve 2 on the second damper B are connected to the gas supply pipeline 5 with the same gas source. "Same gas source" means that the air pressure source of the control valve 2 on the first damper A and the control valve 2 on the second damper B is the same. The gas supply pipeline 5 with the same gas source includes a main gas pipe 5-1, a first branch gas pipe 5-2, and a second branch gas pipe 5-3. The main gas pipe 5-1 is connected to the first branch gas pipe 5-2 and the second branch gas pipe 5-3 through a tee connector 5-4. The main air pipe 5-1 is connected to the underground compressed air pipeline of the coal mine. The airflow is distributed through the tee (25) and valve. The control valve 2 of the first air door A is connected to the cylinder 4 of the second air door, and the control valve 2 of the second air door is connected to the cylinder 4 of the first air door to achieve cross control.

[0028] The control valve 2 is linked to the door leaf of the corresponding damper via an operating mechanism. When one damper is opened, its control valve 2 is triggered to open, and compressed air is delivered to the cylinder 4 of the other damper, driving the door bolt 3 to extend into the latch 1 to lock it. When the damper is closed, the control valve 2 resets, the cylinder 4 returns to its original position, and the door bolt 3 disengages from the latch 1 to release the lock. This ensures that the two dampers cannot be opened simultaneously.

[0029] This pneumatic interlocking device for dampers uses compressed air as a power source, fundamentally eliminating the easily worn and failed mechanical traction ropes and springs in existing technologies, and solving the core problems of poor reliability and short lifespan of mechanical interlocking.

[0030] The cross-pipeline design establishes an absolutely reliable interlocking logic. This ensures that under any circumstances, the opening of one damper will immediately and forcibly lock the other damper, effectively preventing airflow short circuits and providing extremely high safety.

[0031] It can utilize the existing compressed air pipelines in the coal mine as the air source, without the need for additional motors or hydraulic systems, making the device low in cost, low in energy consumption, and easy to install, making it particularly suitable for large-scale application in coal mine environments.

[0032] like Figure 6As shown, the operating mechanism includes an operating handle 9 installed on the damper frame and a pressure plate 8 fixed to the damper leaf. The operating handle 9 is rotatably installed on the damper frame, with one end being the driving end and the other end being the operating end. The driving end cooperates with the valve switch 2-1 controlling the air valve 2, and the operating end cooperates with the pressure plate 8. An elastic reset mechanism is provided between the operating handle 9 and the damper frame. When the damper is closed, the pressure plate 8 presses the operating end of the operating handle 9 against the door frame 14, and the driving end of the operating handle 9 moves away from the valve switch 2-1, causing the valve switch 2-1 to open automatically, or the valve switch 2-1 directly drives the valve switch 2-1 to open, thus placing the valve switch 2-1 in the open working position. When the damper is open, the pressure plate 8 rotates away from the door frame 14 with the door leaf 15, releasing the pressure on the operating end of the operating handle 9. The operating handle 9 rotates and resets under the action of the elastic reset mechanism, and its driving end pushes the valve switch 2-1 during rotation, placing the valve switch 2-1 in the closed working position. This operating mechanism, through the coordination of lever 9 and pressure plate 8, precisely converts the signal into an on / off signal for the air valve, with a direct and error-free triggering mechanism. The elastic reset mechanism ensures that after the damper is closed, lever 9 and control air valve 2 automatically reset to the standby state, requiring no manual intervention and achieving a high degree of automation. It realizes the state transition of unlocking upon closing and locking upon opening. The simple and direct mechanical structure significantly reduces the risk of jamming and malfunction compared to complex rope and pulley systems.

[0033] Furthermore, the operating handle 9 includes an operating rod 9-1 rotatably connected to the damper frame. One end of the operating rod 9-1 is welded to a fork-shaped bracket 9-2, on which a rotating wheel 9-3, cooperating with the valve switch 2-1 of the control valve 2, is mounted. The other end of the operating rod 9-1 is equipped with a pulley 9-4 that cooperates with the pressure plate 8. By placing the rotating wheel 9-3 and pulley 9-4 at the key contact points of the operating handle 9, sliding friction is transformed into rolling friction, greatly reducing resistance and component wear during operation, making the action more sensitive and convenient, and significantly extending the operating mechanism and its service life. The gentle contact between the rotating wheel 9-3 and the valve switch 2-1 avoids hard impacts and scratches on the valve core of the control valve 2, protecting precision pneumatic components and improving the reliability of the entire system.

[0034] To improve overall integrity, the control valve 2 and operating handle 9 are fixed to the damper frame via mounting bracket 10. In this embodiment, the control valve 2 and operating handle 9 are installed on the crossbeam 14-3 of the damper frame. By setting up the mounting bracket 10, the control valve 2 and operating handle 9 are integrated into a single unit. This allows for pre-assembly and debugging before on-site installation, greatly simplifying the installation process and improving efficiency. Subsequent maintenance also allows for easy disassembly and repair.

[0035] The mounting bracket 10 is L-shaped and includes a first upright plate 10-1 and a second upright plate 10-2 vertically welded to one side of the first upright plate 10-1; the control air valve 2 is fixed on the first upright plate 10-1; a rotation fulcrum 13 is welded on the first upright plate 10-1; the operating handle 9 is installed on the rotation fulcrum 13 and is rotatably connected to the first upright plate 10-1 via the rotation fulcrum 13.

[0036] The L-shaped mounting bracket 10 is simple and sturdy, providing reliable support for the control valve 2 and the operating handle 9. The design of the first upright plate 10-1 and the second upright plate 10-2 achieves functional zoning, making the layout of pneumatic components and mechanical transmission components clear and non-interfering, thus optimizing space utilization. The rotation fulcrum 13 is directly welded to the first upright plate 10-1, ensuring the stability and accuracy of the rotation center of the operating handle 9 and avoiding trigger failure due to loose fulcrum.

[0037] Preferably, the elastic reset mechanism is a spring sleeve 12, such as... Figure 5 and Figure 6 As shown, the device includes a sleeve 12-1 and a telescopic spring 12-2 disposed within the sleeve 12-1. One end of the sleeve 12-1 is welded to the second vertical plate 10-2, and the other end has an opening 12-3 for movably assembling the operating handle 9. The opening 12-3 extends radially through the sleeve 12-1 and axially. The operating handle 9 is movably disposed within the spring sleeve 12, and the telescopic spring within the spring sleeve 12 is located between the second vertical plate 10-2 and the operating handle 9. The structure of the sleeve 12-1 encapsulates the telescopic spring 12-2, effectively preventing downhole dust and debris from entering the spring, avoiding spring failure due to corrosion or jamming, and ensuring the absolute reliability of the reset action. The opening 12-3 on the sleeve 12-1 allows for flexible movement of the operating handle and also provides good guidance and limitation for its movement trajectory, preventing the operating handle 9 from swaying or derailing during the reset process, making the action more precise.

[0038] The cylinder 4 is horizontally mounted on the lower part of the damper door, and the bolt 3 is welded to the piston rod of the cylinder 4. By horizontally mounting the cylinder on the lower part of the door and welding the bolt to the piston rod, the thrust of the cylinder is directly used for locking, resulting in high transmission efficiency. The welded connection is robust and can withstand frequent impacts and vibrations, making it ideal for harsh underground working conditions.

[0039] The door latch 1 is a buckle or slot that matches the door bolt 3.

[0040] The installation method for this pneumatic interlock device for the damper is as follows:

[0041] First, process the first vertical plate 10-1 (approximately 200mm × 90mm × 3mm), and weld the second vertical plate 10-2 (200mm × 30mm × 3mm) onto it. Fix the control valve 2 to the top of the first vertical plate 10-1. The spring sleeve 12 is machined from a 6-point pipe, with two-thirds open, and welded to the second vertical plate 10-2. The operating lever 9 is mounted on the first vertical plate 10-1 via a pivot point 13. One end of the operating lever is fitted with a pulley for contacting the pressure plate 8, and the other end is fitted with a pulley (bearing) for pressing the valve core of the control valve 2. A telescopic spring is placed inside the spring sleeve 12, so that the operating lever is pressed down by the pressure plate 8 when the damper is closed.

[0042] Cylinder 4 is horizontally mounted on the lower part of the damper door, and door bolt 3 is welded to the cylinder piston rod. Door latch 1 is bolted to the lower corner of the door frame, corresponding to door bolt 3. Compressed air is introduced into the main air pipe 5-1, and then branched through valves and tee connectors 5-4 to the control valves 2 of the two dampers. The first exhaust pipe 6 of the control valve 2 of the first damper is connected to the cylinder 4 of the second damper, and the first exhaust pipe 7 of the control valve 2 of the second damper is connected to the cylinder 4 of the first damper, achieving cross-control.

[0043] Working principle:

[0044] When no one is passing by, such as Figure 2 As shown, with both dampers closed, the control valves 2 on both dampers are in the closed state, no air pressure passes through the control valves 2, the door bolt 3 is not inserted into the door latch 1, and the dampers can be opened. Figure 4 As shown, when someone opens the first air damper, the damper door rotates, causing the pressure plate 8 to disengage from the operating handle 9. The operating handle 9, under the action of a spring, rotates around the fulcrum 13, and its end pulley presses down the valve core of the control valve 2. The valve opens, compressed air enters the second air damper cylinder 4, pushing the piston rod out. The second air damper's latch 3 inserts into the door latch 1, locking the second air damper. When the first air damper closes, the pressure plate 8 presses down the operating lever, the valve resets, the cylinder 4 returns to its original position, and the lock is released. Similarly, as... Figure 3 As shown, when the second air door is opened, the first air door is locked.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pneumatic interlocking device for dampers, comprising a first damper (A) and a second damper (B), characterized in that... Each damper is equipped with a pneumatic control assembly, which includes a door latch (1), a door bolt (3), a cylinder (4), a control valve (2), and an air supply line. The door latch (1) is fixed to the door frame of the damper; the door bolt (3) is fixed to the door leaf of the damper and connected to the piston rod end of the cylinder (4); the door bolt (3) is aligned with the door latch (1); The gas supply pipeline includes a gas supply pipeline (5), a first exhaust pipe (6), and a second exhaust pipe (7). The outlet of the control valve (2) on the first damper (A) is connected to the cylinder (4) on the second damper (B) through the first exhaust pipe (6). The outlet of the control valve (2) on the second damper (B) is connected to the cylinder (4) on the first damper (A) through the second exhaust pipe (7). The inlet of the control valve (2) on the first damper (A) and the inlet of the control valve (2) on the second damper (B) are connected to the gas supply pipeline (5). The control valve (2) is linked to the door leaf of the corresponding damper through the operating mechanism; when one damper is opened, its control valve (2) is triggered to open, and compressed air is delivered to the cylinder (4) of the other damper, driving the door bolt (3) to extend into the door latch (1) to achieve locking; when the damper is closed, the control valve (2) is reset, the cylinder (4) returns to its position, and the door bolt (3) exits the door latch (1) to release the locking.

2. The pneumatic interlock device for the damper according to claim 1, characterized in that, The operating mechanism includes an operating handle (9) installed on the damper frame and a pressure plate (8) fixed to the damper door leaf; the operating handle (9) is rotatably installed on the damper frame, with one end being the driving end and the other end being the operating end. The driving end cooperates with the valve switch (2-1) of the control air valve (2), and the operating end cooperates with the pressure plate (8); and an elastic reset mechanism is provided between the operating handle (9) and the damper frame; when the damper is closed, the pressure plate (8) presses down on the operating end of the operating handle (9), and the driving end of the operating handle (9) puts the valve switch (2-1) in the open working position; when the damper is opened, the pressure plate (8) releases the operating end of the operating handle (9), and the driving end of the operating handle (9) drives the valve switch (2-1) to the closed working position under the action of the elastic reset mechanism.

3. The pneumatic interlock device for the damper according to claim 2, characterized in that, The operating handle (9) includes an operating rod (9-1) rotatably connected to the door frame of the damper. One end of the operating rod (9-1) is welded with a fork-shaped frame (9-2), and a rotating wheel (9-3) that cooperates with the valve switch (2-1) of the control air valve (2) is installed on the fork-shaped frame (9-2). The other end of the operating rod (9-1) is equipped with a pulley (9-4) that cooperates with the pressure plate (8).

4. The pneumatic interlock device for the damper according to claim 2 or 3, characterized in that, The control valve (2) and the operating handle (9) are fixed to the door frame via the mounting bracket (10).

5. The pneumatic interlock device for the damper according to claim 4, characterized in that, The mounting bracket (10) is L-shaped and includes a first upright plate (10-1) and a second upright plate (10-2) vertically welded to one side of the first upright plate (10-1); The control valve (2) is fixed on the first vertical plate (10-1); A rotation fulcrum (13) is welded onto the first upright plate (10-1); The operation handle (9) is installed on the rotation fulcrum (13) and is rotatably connected to the first upright plate (10-1) via the rotation fulcrum (13).

6. The pneumatic interlock device for the damper according to claim 5, characterized in that, The elastic reset mechanism is a spring sleeve (12), including a sleeve (12-1) and a telescopic spring (12-2) disposed in the sleeve (12-1). One end of the sleeve (12-1) is welded to the second vertical plate (10-2), and the other end is provided with an opening (12-3) for movably assembling the operating handle (9). The opening (12-3) passes radially through the sleeve (12-1) and extends axially. The operating handle (9) is movably disposed in the spring sleeve (12), and the telescopic spring in the spring sleeve (12) is located between the second vertical plate (10-2) and the operating handle (9).

7. The pneumatic interlock device for dampers according to any one of claims 1 to 3, characterized in that, The gas supply pipeline (5) includes a main gas pipe (5-1), a first branch gas pipe (5-2), and a second branch gas pipe (5-3). The main gas pipe (5-1) is connected to the first branch gas pipe (5-2) and the second branch gas pipe (5-3) through a three-way connector (5-4).

8. The pneumatic interlock device for dampers according to any one of claims 1 to 3, characterized in that, The cylinder (4) is horizontally installed at the lower part of the door leaf, and the door bolt (3) is welded to the piston rod of the cylinder (4).

9. The pneumatic interlock device for dampers according to any one of claims 1 to 3, characterized in that, The door latch (1) is a buckle or slot that matches the door bolt (3).

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