Mine forward air door airflow short circuit prevention driving device and air path system

Abstract

The invention discloses a mine forward air door airflow short circuit prevention driving device and an air path system. The driving device comprises a first main control box, a first auxiliary control box, a second main control box and a second auxiliary control box. The gas path system comprises a first series control gas path, a second series control gas path, a parallel interlocking control gas path and a driving control gas path. Mutual locking control of the air doors on the two sides can be achieved while jamming of the mechanical locking device is avoided; meanwhile, a dual-pressure valve arranged in the control box assembly detects and judges the air pressure of the air doors on the two sides, the air door on the low-pressure side is locked through low-pressure side output, the air flow short circuit problem caused when the two air doors are opened at the same time is solved, the working efficiency of a using unit is effectively improved, and safety guarantee is provided for coal mine safety production; the first main control box is communicated with the first auxiliary control box in series, the second main control box is communicated with the second auxiliary control box in series, the first main control box and the second main control box are communicated in a parallel interlocking mode, and when a gas circuit breaks down, a problem part can be rapidly found out.

Description

Technical Field

[0001] This invention relates to the field of mine ventilation door control technology, and in particular to a mine forward ventilation door airflow anti-short circuit drive device and air circuit system. Background Technology

[0002] In underground coal mines, intake shafts are responsible for supplying fresh air, while return shafts exhaust stale air. The main intake and return airways are the main channels for air circulation, and the air walls and doors in the connecting roadways play a crucial role in controlling the direction of airflow and preventing air mixing. If the air walls develop cracks or are not completely sealed, or if there are insufficient numbers of air doors, they may not close tightly, or there is a lack of automated control, fresh air may bypass the underground working area and flow directly from the intake shaft into the return shaft through the connecting roadways. This phenomenon of fresh air directly mixing with stale air and not flowing along the predetermined route is called airflow short-circuiting. It can lead to insufficient airflow in the working area, causing serious safety hazards such as gas accumulation and dust explosions.

[0003] In underground coal mine ventilation systems, to ensure stable airflow and prevent short circuits, two air doors installed at intervals must not be opened simultaneously. Currently, the industry's conventional solutions to this problem mainly employ mechanical interlocking devices, pneumatic control devices, or a combination of both. However, the underground environment is complex. Humid air can easily cause metal parts to rust, and particulate impurities such as coal dust and rock powder can enter the gaps in the slide rails and latches, causing the mechanical interlocking devices to jam, preventing the air doors from opening properly and affecting the passage of personnel and equipment. Furthermore, when the underground air pressure is unstable, the pneumatic control device may experience air leaks or insufficient pressure, leading to the failure of the cylinder locking force. If the control valve malfunctions and cannot accurately switch the air path, it can cause both air doors to open simultaneously, resulting in airflow short circuits and threatening safe production underground. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art by proposing a short-circuit prevention drive device and air circuit system for mine forward ventilation doors.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a mine forward ventilation door airflow short-circuit protection drive device, comprising:

[0006] A control box assembly and a cylinder assembly, wherein the control box assembly and the cylinder assembly are connected by a pipeline;

[0007] The control box assembly includes a first main control box, a first auxiliary control box, a second main control box, and a second auxiliary control box. The first main control box and the first auxiliary control box are connected in series via pipelines, and the second main control box and the second auxiliary control box are connected in series via pipelines. The first main control box and the second main control box are connected in parallel and interlocked via pipelines. The control box assembly is used for closed-loop control of the cylinder assembly.

[0008] In some embodiments, a set of switch buttons are provided on the outside of the first main control box, the first auxiliary control box, the second main control box, and the second auxiliary control box. The switch buttons include a green button and a red button. The green button is used to drive the cylinder assembly to open the damper, and the red button is used to drive the cylinder assembly to close the damper.

[0009] In some embodiments, the first main control box is provided with a dual-control pneumatic valve a, which is connected to a single-control pneumatic valve a and a shuttle valve a1. The single-control pneumatic valve a is connected to a shuttle valve a2, and the shuttle valve a1 is connected to a shuttle valve a3 and a dual-pressure valve a.

[0010] In some embodiments, the second main control box is provided with a dual-control pneumatic valve b, which is connected to a single-control pneumatic valve b and a shuttle valve b1. The single-control pneumatic valve b is connected to a shuttle valve b2, and the shuttle valve b1 is connected to a shuttle valve b3.

[0011] In some embodiments, the first auxiliary control box is equipped with an oil-water separator, which is connected to the air circuit interface and the switch button of the first auxiliary control box via a tee, and the air circuit interface and the switch button of the second auxiliary control box are connected.

[0012] In some embodiments, the cylinder assembly includes a first drive cylinder and a second drive cylinder, the first drive cylinder being connected to a first main control box via a pipeline, and the second drive cylinder being connected to a second main control box via a pipeline, the cylinder assembly driving the damper to open or close.

[0013] In a second aspect, the present invention also provides a mine forward ventilation door airflow short-circuit prevention gas path system, for connecting via pipeline to the mine forward ventilation door airflow short-circuit prevention drive device as described in the first aspect, the gas path system comprising:

[0014] The first series control air circuit is used to connect the first main control box and the first auxiliary control box in series.

[0015] The second series control air circuit is used to connect the second main control box and the second auxiliary control box in series.

[0016] Parallel interlock control air circuit, used to connect the first main control box and the second main control box in parallel;

[0017] The drive control air circuit is used to connect the control box assembly and the cylinder assembly in series.

[0018] In some embodiments, the first main control box and the first auxiliary control box are connected in series through corresponding first air passage ports, and the second main control box and the second auxiliary control box are connected in series through corresponding second air passage ports.

[0019] In some embodiments, the first main control box and the second main control box are connected in parallel through a correspondingly configured third air passage port, the first main control box and the first drive cylinder box are connected in series through a correspondingly configured fourth air passage port, and the second main control box and the second drive cylinder box are connected in series through a correspondingly configured fourth air passage port.

[0020] In some embodiments, the first main control box, the first auxiliary control box, the second main control box, and the second auxiliary control box are provided with interconnected pressure relief ports.

[0021] The present invention has the following beneficial effects:

[0022] 1. In this invention, when both air doors are closed, pressing one button controls one side's cylinder assembly to open the air door, while the other air door cannot be opened. Pressing both buttons will only open one side of the air door at most, avoiding jamming of the mechanical locking device and achieving mutual locking control of the two air doors. The dual-pressure valve inside the control box assembly detects and judges the air pressure of the two air doors, and locks the low-pressure side air door through the low-pressure side output, solving the problem of airflow short circuit between the two air doors, effectively improving the working efficiency of the user unit, and providing safety guarantee for coal mine safe production.

[0023] 2. In this invention, the first main control box and the first auxiliary control box are connected in series through pipelines, the second main control box and the second auxiliary control box are connected in series through pipelines, and the first main control box and the second main control box are connected in parallel and interlocked through pipelines. When a fault occurs in the gas circuit, the problem location can be quickly identified. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the principle of the airflow anti-short circuit drive device proposed in this invention. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the principle of the airflow anti-short circuit drive device proposed in this invention. Figure 2 ;

[0026] Figure 3 This is a schematic diagram of the principle of the airflow anti-short circuit drive device proposed in this invention. Figure 3 ;

[0027] Figure 4 This is a schematic diagram of the principle of the airflow anti-short circuit drive device proposed in this invention. Figure 4 ;

[0028] Figure 5 This is a schematic diagram of the principle of the airflow anti-short circuit drive device proposed in this invention. Figure 5 ;

[0029] Figure 6 Schematic diagram of the airflow anti-short circuit air circuit system proposed in this invention Figure 1 ;

[0030] Figure 7 Schematic diagram of the airflow anti-short circuit air circuit system proposed in this invention Figure 2 ;

[0031] Figure 8 This is a schematic diagram of the airflow anti-short circuit airflow system proposed in this invention. Figure 3 ;

[0032] Figure 9 This is a schematic diagram of the airflow anti-short circuit airflow system proposed in this invention. Figure 4 .

[0033] Legend:

[0034] 1. Control box assembly; 11. First main control box; 111. Dual-control pneumatic valve a; 112. Single-control pneumatic valve a; 113. Shuttle valve a1; 114. Shuttle valve a2; 115. Shuttle valve a3; 116. Dual-pressure valve a; 12. First auxiliary control box; 121. Oil-water separator; 13. Second main control box; 131. Dual-control pneumatic valve b; 132. Single-control pneumatic valve b; 133. Shuttle valve b1; 134. Shuttle valve b2; 13 5. Shuttle valve b3; 14. Second auxiliary control box; 2. Cylinder assembly; 21. First drive cylinder; 22. Second drive cylinder; 3. Switch button; 31. Green button; 32. Red button; 4. First series control air circuit; 41. First air circuit port; 5. Second series control air circuit; 51. Second air circuit port; 6. Parallel interlock control air circuit; 61. Third air circuit port; 7. Drive control air circuit; 71. Fourth air circuit port. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] This application provides a mine forward ventilation door airflow short-circuit prevention drive device and air circuit system, solving the problems of mechanical interlocking devices jamming in the prior art, which prevents the ventilation door from opening normally, affecting the passage of personnel and equipment; and cylinder locking force failure, and control valve failure that cannot accurately switch the air circuit, resulting in both ventilation doors opening simultaneously, causing airflow short-circuit problems and threatening underground safe production. In this application, pressing a button on one side controls the cylinder assembly on one side to drive the ventilation door to open, while the other ventilation door cannot be opened. Pressing buttons on both sides allows only one ventilation door to open at most, avoiding jamming of the mechanical interlocking device and achieving mutual interlocking control of the two ventilation doors. Furthermore, the dual-pressure valve inside the control box assembly detects and judges the air pressure of both ventilation doors, locking the low-pressure side ventilation door through the low-pressure side output, solving the airflow short-circuit problem between the two ventilation doors, effectively improving the work efficiency of the user and providing safety assurance for coal mine safe production.

[0037] Please refer to the following examples for details:

[0038] Reference Figures 1-5 The present invention provides an embodiment of a mine forward ventilation door airflow anti-short circuit drive device, the specific structure of which includes: a control box assembly 1 and a cylinder assembly 2, and the control box assembly 1 and the cylinder assembly 2 are connected by a pipeline to form a complete closed-loop control system.

[0039] Furthermore, the control box assembly 1 includes a first main control box 11, a first auxiliary control box 12, a second main control box 13, and a second auxiliary control box 14. The first main control box 11 and the first auxiliary control box 12 are connected in series via pipelines, while the second main control box 13 and the second auxiliary control box 14 are connected in series via pipelines. The first main control box 11 and the second main control box 13 are also connected in parallel via pipelines and interlocked. This allows for rapid identification of the problem area when a fault occurs in the air circuit, while simultaneously enabling closed-loop control of the cylinder assembly 2, ensuring the accuracy and reliability of the damper's operation.

[0040] Specifically, the first main control box 11 is equipped with a dual-control pneumatic valve a111, which is connected to a single-control pneumatic valve a112 and a shuttle valve a1113. The single-control pneumatic valve a112 is connected to a shuttle valve a2114, and the shuttle valve a1113 is connected to a shuttle valve a3115 and a dual-pressure valve a116. Correspondingly, the second main control box 13 is equipped with a dual-control pneumatic valve b131, which is connected to a single-control pneumatic valve b132 and a shuttle valve b1133. The single-control pneumatic valve b132 is connected to a shuttle valve b2134, and the shuttle valve b1133 is connected to a shuttle valve b3135.

[0041] For example, the dual-control pneumatic valves a111 and b131 are two-position five-way dual-control pneumatic valves of model 4A420-15: the valve core position is switched by two control signals (P1, P2) to realize the switching of the air source direction in the pneumatic system. The five interfaces include an air inlet (P), a working port (A / B), and an exhaust port (R / S); while the single-control pneumatic valves a112 and b132 are two-position three-way single-control pneumatic valves of model 3A110-08NO (NO indicates normally open, and the corresponding function can also be achieved by modifying a two-position five-way valve and a plug): the valve core position is switched by a single control signal (P1) to realize the opening and closing of the air path at the pilot end. The three interfaces include an air inlet (P), a working port (A), and an exhaust port (R).

[0042] It should be noted that each of the single-control pneumatic valves a112 and b132 has an additional pneumatic port on one side. When gas is introduced, the internal spring is compressed, thus shutting off the pneumatic path connecting to the valve body (i.e., Figure 3 A5 port and Figure 4 (B7 port in the middle), thus ensuring that pressing one button can control the cylinder assembly on one side to drive the damper to open, while the damper on the other side cannot be opened.

[0043] Furthermore, shuttle valves a1113, a2114, a3115, b1133, b2134, and b3135 adopt ST-02 type OR valves (the corresponding functions can also be achieved by splicing two one-way valves and a three-way valve): two air inlets (P1, P2) and one air outlet (A), with the higher pressure passage from the air inlets leading to port A; while dual-pressure valve a116 adopts STH-01 type AND valves: two air inlets (P1, P2) and one air outlet (A), with output only at port A when both P1 and P2 have pressure.

[0044] Understandably, referring to Figures 2-5The P port of the dual-control pneumatic valves a111 and b131 is connected to an external air supply source, while the A and B ports are connected to the inlet and outlet ports of the corresponding cylinder assembly 2, respectively. The R and S ports serve as exhaust ports for discharging air from the source. Furthermore, the two control terminals of the dual-control pneumatic valve a111 are connected to the single-control pneumatic valve a112 and the shuttle valve a1113, respectively, and the two control terminals of the dual-control pneumatic valve b131 are connected to the single-control pneumatic valve b132 and the shuttle valve b1133, respectively, thus achieving bidirectional control of the cylinder assembly 2's movement. The output of the pneumatic control valve a112 is connected to the shuttle valve a2114, and the output of the single-control pneumatic control valve b132 is connected to the shuttle valve b2134, which are used to realize the manual control of the side damper switch button 3 respectively; the two inputs of the shuttle valve a1113 are connected to the double-control pneumatic control valve a111 and the external control signal respectively, the output of the shuttle valve a1113 is connected to the shuttle valve a3115 and the double pressure valve a116, and the output of the shuttle valve b1133 is connected to the shuttle valve b3135, which are used to realize the logical combination of signals and the closed-loop interlocking mechanism.

[0045] Furthermore, the first auxiliary control box 12 is equipped with an oil-water separator 121. The oil-water separator 121 is connected to the air interface and switch button 3 of the first auxiliary control box 12 via a three-way valve. The air interface of the second auxiliary control box 14 is connected to the switch button 3. Specifically, the oil-water separator 121 is a BFC-4000 model. Structurally, it is a two-unit design. Other similar structures include, but are not limited to, three-unit and single-unit designs. It can effectively filter oil droplets, water droplets, and solid particulate impurities in compressed air, ensuring that the compressed air entering the control system is clean and dry. At the same time, an independent air source filter can be connected to the outside of the control box assembly 1 as a device for treating the air source.

[0046] Correspondingly, each of the first main control box 11, the first auxiliary control box 12, the second main control box 13, and the second auxiliary control box 14 is equipped with a set of conspicuous switch buttons 3. Specifically, the switch buttons 3 include a green button 31 and a red button 32; the green button 31 is used to drive the cylinder assembly 2 to open the damper, and the red button 32 is used to drive the cylinder assembly 2 to close the damper; after the button is pressed, the control system will determine whether opening is allowed based on the current status, and drive the corresponding drive cylinder to act through the air circuit signal.

[0047] Furthermore, the cylinder assembly 2 includes a first drive cylinder 21 and a second drive cylinder 22, which are used to drive the opening and closing of the two dampers, respectively. Specifically, the first drive cylinder 21 is connected to the first main control box 11 through a dedicated air pipeline, and the second drive cylinder 22 is connected to the second main control box 13 through a dedicated air pipeline. Through precise air circuit control, the cylinder assembly 2 can achieve smooth opening and closing of the dampers. The opening and closing times can be precisely adjusted by control valves such as air circuit throttle valves to meet the usage requirements under different working conditions.

[0048] Reference Figures 6-9 The present invention also provides an embodiment of a mine forward ventilation door airflow short-circuit prevention air circuit system, which is used to connect the mine forward ventilation door airflow short-circuit prevention drive device as described in the above embodiment through a pipeline. The air circuit system includes: a first series control air circuit 4, a second series control air circuit 5, a parallel interlock control air circuit 6, and a drive control air circuit 7.

[0049] The first main control box 11 and the first auxiliary control box 12 are connected in series via a first series control air path 4 formed by corresponding first air path ports 41. The second main control box 13 and the second auxiliary control box 14 are connected in series via a second series control air path 5 formed by corresponding second air path ports 51. The first main control box 11 and the second main control box 13 are connected in parallel via a parallel interlocking control air path 6 formed by corresponding third air path ports 61. Correspondingly, the first main control box 11 and the first drive cylinder 21 box are connected in series via a drive control air path 7 formed by corresponding fourth air path ports 71. The second main control box 13 and the second drive cylinder 22 box are connected in series via a drive control air path 7 formed by corresponding fourth air path ports 71.

[0050] Please continue reading. Figure 6 This is a schematic diagram of the air circuit connections between the control box components:

[0051] First, the first air passage port 41 includes an air source port A1, an opening port A2, and a closing port A3: the external air source connected to the first auxiliary control box 12 is divided into three paths by a three-way valve. One path goes through the air source port A1 and connects to the P port of the dual-control air valve a111 inside the first main control box 11. Another path goes through the opening port A2 and connects to the green button 31 outside the first auxiliary control box 12 and the shuttle valve a2114 inside the first main control box 11. The third path goes through the closing port A3 and connects to the red button 32 outside the first auxiliary control box 12 and the shuttle valve a3115 inside the first main control box 11.

[0052] Correspondingly, the second air passage port 51 includes an air source port B1, an opening port B2, and a closing port B3. One path connects to the P port of the dual-control air valve b131 inside the second main control box 13 via the air source port B1. Another path connects to the green button 31 outside the second auxiliary control box 14 and the shuttle valve b2134 inside the second main control box 13 via the opening port B2. Finally, another path connects to the red button 32 outside the second auxiliary control box 14 and the shuttle valve b3135 inside the second main control box 13 via the closing port B3.

[0053] It should be explained in detail that the first main control box 11, the first auxiliary control box 12, the second main control box 13, and the second auxiliary control box 14 are provided with interconnected pressure relief ports A4 / B4. Port A4 is connected to the P port of the dual-control pneumatic valve a111 inside the first main control box 11, and port B4 is connected to the P port of the dual-control pneumatic valve b131 inside the second main control box 13. Through the pressure relief ports A4 / B4, a hand-operated pressure relief valve can be connected externally (opening the pressure relief valve on any control box component 1 will discharge the air source from the inside) to realize the pressure relief operation of the entire pneumatic system (as prior art, not shown in the figure).

[0054] In addition, the third air circuit port 61 includes multiple sets of corresponding interlocked control ports A5 / B5, A6 / B6, A7 / B7, A8 / B8, and A9 / B9: port A5 is connected to the single-control pneumatic valve a112 inside the first main control box 11, and port B5 is connected to port A of the double-control pneumatic valve b131 inside the second main control box 13; port A6 is connected to the double-pressure valve a116 inside the first main control box 11, and port B6 is connected to the shuttle valve b1133 inside the second main control box 13; Port A7 is connected to the dual-pressure valve a116 inside the first main control box 11, and port B7 is connected to the single-control pneumatic valve b132 inside the second main control box 13; port A8 is connected to the dual-pressure valve a116 inside the first main control box 11, and port B8 is connected to the A port of the dual-control pneumatic valve b131 inside the second main control box 13; port A9 is connected to the P port of the dual-control pneumatic valve a111 inside the first main control box 11, and port B9 is connected to the P port of the dual-control pneumatic valve b131 inside the second main control box 13.

[0055] In addition, the fourth air passage port 71 includes a damper opening port and a damper closing port: the damper opening port and the damper closing port of the first main control box 11 are connected to the first drive cylinder 21, and the damper opening port and the damper closing port of the second main control box 13 are connected to the second drive cylinder 22.

[0056] It is understood that the external air source provides power to the control box assembly 1 through the following path: main air source → oil-water separator 121 in the first auxiliary control box 12 (three-way valve → separate air supply to ports A1, A2, and A3) → port A1 (air source outlet) in the first auxiliary control box 12 → port A1 (air source inlet) in the first main control box 11 → port A9 (air source outlet) in the first main control box 11: the air inlet of the two-position five-way double control valve a in the first main control box 11, and the red button 32 and green button in the first main control box 11. Air supply from the inlet of button 31; air supply from the pressure relief valve in the first main control box 11 → port B9 in the second main control box 13 (air source inlet: air supply from the two-position five-way valve b in the second main control box 13, air supply from the red button 32 and green button 31 in the second main control box 13; air supply from the pressure relief valve in the second main control box 13) → port B4 in the second main control box 13 (air source outlet) → port B4 in the second auxiliary control box 14 (air source inlet) → air supply from the red button 32 and green button 31 in the second main control box 13.

[0057] In this configuration, port A2 of the first auxiliary control box 12 is connected to the air outlet of the green button 31 on the door opening side, and port A2 inside the first main control box 11 is connected to one side of the shuttle valve a2114 on the door opening side (the symmetrical side of the shuttle valve a2114 is connected to the air outlet of the green button 31 on the door opening side of the first auxiliary control box 12), and the ports A2 of the two are connected by an air pipe, so that opening the door has an equivalent function; port A3 of the first auxiliary control box 12 is connected to the air outlet of the red button 32 on the door closing side, and port A2 inside the first main control box 11 is connected to the air outlet of the green button 31 on the door opening side. 3 is connected to the side of the shuttle valve a3115 on the closing side (the side of the shuttle valve a2114 is symmetrically connected to the air outlet of the red button 32 on the closing side of the first auxiliary control box 12), and the ports A3 of the above two are connected through air pipes. When the closing button is pressed separately or simultaneously, they have equivalent effects; the port A4 in the first auxiliary control box 12 is connected to the air outlet of the pressure relief valve, and the A4 in the first main control box 11 is connected to the air outlet of the pressure relief valve. The two are connected through air pipes. Pulling either pressure relief valve can realize the emergency pressure relief function.

[0058] The airflow path between the first main control box 11 and the second main control box 13 is as follows: (1) Port A5 of the first main control box 11 → Port B5 of the second main control box 13: Port A5 of the first main control box 11 is connected to the pilot end of the single-control pneumatic valve a112, and Port B5 of the second main control box 13 is connected to the outlet end of the double-control pneumatic valve b131 (or the open port of the cylinder assembly 2 or the port A8 of the first main control box 11). The two are connected to achieve the interlocking of the closing of the other side of the air door when one side of the air door is opened; (2) The case of Port A7 of the first main control box 11 → Port B7 of the second main control box 13 is the same; (3) Port A6 of the first main control box 11 → Port B6 of the second main control box 13: Port A6 of the first main control box 11 is connected to the double-control pneumatic valve b131. The output end of the pressure valve a116 (which simultaneously performs the closing action on the door shutting valve a1113), and the port B6 of the second main control box 13 are connected to one end of the door shutting valve b1133; (4) The port A8 of the first main control box 11 → the port B8 of the second main control box 13: The port A8 of the first main control box 11 is connected to one side of the input end of the double pressure valve a116 (the symmetrical side of this side is connected to the air outlet of the double control air valve a111), and the port B8 of the second main control box 13 is connected to the air outlet of the double control air valve b131. When the two are connected, the double pressure valve a116 is triggered to judge the air pressure operation when any two switch buttons 3 of the first auxiliary control box 12, the first main control box 11, the second main control box 13 and the second auxiliary control box 14 are pressed synchronously.

[0059] Working principle (the air path in the first main control box 11 and the second main control box 13 is as follows) Figures 7-9 As shown):

[0060] (i) When both air doors are closed, pressing one button controls the cylinder assembly 2 on one side to open the air door, while the other air door cannot be opened. Pressing both buttons will only open one air door at most, achieving mutual interlocking control of the two air doors. At the same time, the dual-pressure valve a116 inside the control box assembly 1 detects and judges the air pressure of the two air doors, and locks the low-pressure side air door through the low-pressure side output, solving the airflow short-circuit problem between the two air doors, effectively improving the work efficiency of the user unit, and providing safety guarantee for coal mine safe production (the first main control box 11 or the second main control box 13 represent one side respectively). The following explanation is based on pressing the green button 31 on the first main control box 11 side as an example:

[0061] When the green door opening button on shuttle valve a2114 inside the first main control box 11 is pressed, shuttle valve a2114 inside the first main control box 11 opens the air path. The air source is introduced through shuttle valve a2114 and single-control air valve a112 to one side of double-control air valve a111. After the valve core inside the valve body is reversed, the total air source enters the valve core through port P of double-control air valve a111. The air source is then split into three after exiting port A of double-control air valve a111, flowing to double-pressure valve a116, cylinder open port, and port A7 respectively (double-pressure valve a116 only works when air is supplied from both sides simultaneously). Figure 7 The red line on the dual-pressure valve a116 inside the first main control box 11 indicates that the interface is not conductive, thus opening the damper on that side; another path connects to port B7 in the second main control box 13 through port A7 in the first main control box 11, putting the single-control pneumatic valve b132 in the second main control box 13 into operation (at this time, port P of the single-control pneumatic valve b132 is closed). Figure 7 (Represented by red lines); when the green button 31 for opening the door on the shuttle valve b2134 inside the second main control box 13 is pressed, the air source cannot pass through the dual-control air control valve b131 (the dual-control air control valve b131 cannot be switched), so the air source cannot work; that is, when one side of the door is opened, the other side cannot be opened.

[0062] When the green door opening button on shuttle valve b2134 inside the second main control box 13 is pressed, its air circuit logic is similar to that described above, and will not be repeated here.

[0063] (II) When both dampers are closed, if the door opening buttons are pressed simultaneously on both sides of the first main control box 11 and the second main control box 13, only one damper can be opened at most. The airflow path within the first main control box 11 and the second main control box 13 is as follows: Figure 8 and Figure 9 As shown:

[0064] When the green button 31 for opening the door is pressed simultaneously on both sides of the first main control box 11 and the second main control box 13, if the dual-pressure valve a116 is not installed, the original interlocking function of the control box will fail (the dual-control pneumatic valve a111 inside the first main control box 11 works before the single-control pneumatic valve a112, and the dual-control pneumatic valve b131 inside the second main control box 13 works before the single-control pneumatic valve b132): When the air source in the first main control box 11 enters the dual-control pneumatic valve a111 through the P port of the single-control pneumatic valve b132 to reverse the valve core, the air source will flow through the A port of the dual-control pneumatic valve a111 to the first drive cylinder 21 to open the damper on that side; the situation in the second main control box 13 is the same, and will not be described again.

[0065] When the green door opening button 31 is pressed simultaneously on both sides of the first main control box 11 and the second main control box 13, if the corresponding dual-pressure valve a116 is installed, the interlocking function of the control boxes will not fail (under this condition, the dual-pressure valve a116 inside the first main control box 11 is triggered to work): Port B8 of the second main control box 13 is connected to port A8 on one side of the dual-pressure valve a116 inside the first main control box 11 through an air circuit. One of the air sources in the dual-control air valve a111 inside the first main control box 11 flows through the lower end of the dual-pressure valve a116. Under this condition, the dual-pressure valve a116 is triggered to work, and the following two situations will occur:

[0066] (1) If the air pressure input on both sides of the double pressure valve a116 is equal, the valve core of the double pressure valve a116 will remain balanced under the action of equal air pressure on both sides. There will be air pressure output at the output end, and the air pressure at the output end is equal to the air pressure at the input end. At this time, the air source at the output end is output through the double pressure valve a116 inside the first main control box 11, and flows to the double control air control valve a111 through the shuttle valve a1113, so that the valve core reverses and performs a closing action again.

[0067] (2) If the air pressure input on both sides of the dual pressure valve a116 is not equal, the air source at the low pressure end is output through the dual pressure valve a116 inside the first main control box 11, and flows to the dual control air control valve a111 through the shuttle valve a1113, so that the valve core is reversed and then the door closing action is performed again.

[0068] For example, the air source output from the second main control box 13 passes through port B8 to port A8 and then to the dual-pressure valve a116. If the air source pressure at this end is low, according to the operating logic of the low-pressure side output of the dual-pressure valve a116, the air source output from the dual-pressure valve a116 in the first main control box 11 causes the dual-control pneumatic valve a111 to reverse again in a very short time. This causes the air source inside the first main control box 11 to flow to port B of the dual-control pneumatic valve a111, and then to the close port of the cylinder assembly 2 to perform the closing action, which results in the damper on this side being unable to open.

[0069] In summary, under both scenarios 1 and 2, the dual-pressure valve a116 installed inside the control box assembly 1 can detect and determine the air pressure of the two dampers, and then lock the low-pressure damper by outputting from the low-pressure side. This ensures that when the green button 31 for opening the door is pressed on both sides at the same time, only one damper can be opened, thus effectively solving the problem of airflow short circuit between the two dampers.

[0070] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A short-circuit protection drive device for a mine forward ventilation door, characterized in that, include: A control box assembly and a cylinder assembly, wherein the control box assembly and the cylinder assembly are connected by a pipeline; The control box assembly includes a first main control box, a first auxiliary control box, a second main control box, and a second auxiliary control box. The first main control box and the first auxiliary control box are connected in series via pipelines, and the second main control box and the second auxiliary control box are connected in series via pipelines. The first main control box and the second main control box are connected in parallel and interlocked via pipelines. The control box assembly is used for closed-loop control of the cylinder assembly.

2. The mine forward ventilation door anti-short circuit drive device according to claim 1, characterized in that, The first main control box, the first auxiliary control box, the second main control box, and the second auxiliary control box are equipped with a set of switch buttons on their exteriors. The switch buttons include a green button and a red button. The green button is used to drive the cylinder assembly to open the damper, and the red button is used to drive the cylinder assembly to close the damper.

3. The mine forward ventilation door anti-short circuit drive device according to claim 2, characterized in that, The first main control box is equipped with a dual-control pneumatic valve a. The dual-control pneumatic valve a is connected to a single-control pneumatic valve a and a shuttle valve a1. The single-control pneumatic valve a is connected to a shuttle valve a2. The shuttle valve a1 is connected to a shuttle valve a3 and a dual-pressure valve a.

4. The mine forward ventilation door anti-short circuit drive device according to claim 2, characterized in that, The second main control box is equipped with a dual-control pneumatic valve b, which is connected to a single-control pneumatic valve b and a shuttle valve b1. The single-control pneumatic valve b is connected to a shuttle valve b2, and the shuttle valve b1 is connected to a shuttle valve b3.

5. The mine forward ventilation door anti-short circuit drive device according to claim 2, characterized in that, The first auxiliary control box is equipped with an oil-water separator, which is connected to the air circuit interface and the switch button of the first auxiliary control box via a tee. The air circuit interface of the second auxiliary control box is connected to the switch button.

6. The mine forward ventilation door anti-short circuit drive device according to claim 1, characterized in that, The cylinder assembly includes a first drive cylinder and a second drive cylinder. The first drive cylinder is connected to a first main control box via a pipeline, and the second drive cylinder is connected to a second main control box via a pipeline. The cylinder assembly drives the damper to open or close.

7. A short-circuit prevention airflow system for mine forward ventilation doors, characterized in that, The air circuit system is used to connect via pipeline to the mine forward ventilation airflow anti-short circuit drive device as described in any one of claims 1 to 6, and the air circuit system includes: The first series control air circuit is used to connect the first main control box and the first auxiliary control box in series. The second series control air circuit is used to connect the second main control box and the second auxiliary control box in series. Parallel interlock control air circuit, used to connect the first main control box and the second main control box in parallel; The drive control air circuit is used to connect the control box assembly and the cylinder assembly in series.

8. The mine forward ventilation door anti-short-circuit air path system according to claim 7, characterized in that, The first main control box and the first auxiliary control box are connected in series through corresponding first air passage ports, and the second main control box and the second auxiliary control box are connected in series through corresponding second air passage ports.

9. The mine forward ventilation door anti-short-circuit air passage system according to claim 7, characterized in that, The first main control box and the second main control box are connected in parallel through a correspondingly configured third air passage port. The first main control box and the first drive cylinder box are connected in series through a correspondingly configured fourth air passage port. The second main control box and the second drive cylinder box are connected in series through a correspondingly configured fourth air passage port.

10. The mine forward ventilation door anti-short-circuit gas path system according to claim 7, characterized in that, The first main control box, the first auxiliary control box, the second main control box, and the second auxiliary control box are equipped with pressure relief ports that are interconnected.

Images