Coal mine drainage system

Abstract

This invention discloses a coal mine drainage system, belonging to the field of drainage technology. It includes a power supply switch circuit and a drainage device. The power supply switch circuit is connected to the drainage device via a magnetic starter. The power supply switch circuit includes a time-delay relay. The protection output point of the power supply protector and the normally closed contact of the power supply auxiliary relay are connected to the coil circuit of the time-delay relay. A rotary switch is connected in series between the time-delay relay and the power supply protector. The normally closed contact of the time-delay relay is connected to the power supply reset button, and the normally open contact is connected to the power supply closing button. The drainage device includes drainage equipment, a pneumatic knife gate valve, and a gate valve control device. The drainage pipeline is connected to the inlet of the drainage equipment. The outlet of the drainage equipment is connected to a check valve and then connected to a central pump room. The gate valve control device is connected to the pneumatic knife gate valve, which is installed on the drainage pipeline of the old mine. This invention can easily realize automatic power-on start-up and automatic water shut-off functions, achieving unattended operation at the drainage site.

Description

Technical Field

[0001] This invention belongs to the field of drainage system technology, and specifically relates to a coal mine drainage system. Background Technology

[0002] The drainage power supply system for the old working face of the coal mine after the longwall mining has been completed is relatively simple. One KJZ-400 power supply unit is installed on site as the main power supply for the drainage point, one integrated lighting power supply unit is used for the lighting of the drainage point, and two QJZ-40 / 1140 (660) magnetic starters (with automatic water level control) are used to supply power to the water pumps at the drainage point. The current drainage power supply system has the following defects: after the upper power supply trips, the water in the old working face cannot be automatically shut off, causing water damage accidents. In order to shut off the water in time, it is necessary to arrange for a dedicated person to patrol in three shifts, which requires a large amount of manpower.

[0003] Among related technologies, Chinese utility model patent with authorization announcement number CN211786730U discloses a PLC-controlled automatic drainage device for coal mines, including an explosion-proof enclosure. The enclosure houses a PLC controller and an intrinsically safe power inverter connected to the PLC controller. The intrinsically safe power inverter includes two intrinsically safe power inverters connected in parallel. Each intrinsically safe power inverter is connected to a 127V AC power line. The PLC controller is connected to a liquid level sensor installed in a temporary water tank. The PLC controller is connected via a control line to a vacuum electromagnetic starter for controlling the start of an underground electric water pump or a solenoid valve for controlling the start of an underground air pump. This allows the automatic drainage device to be integrated into a temporary drainage system without altering existing temporary drainage equipment in the coal mine, enabling unattended automatic drainage.

[0004] Chinese utility model patent with authorization announcement number CN204189040U discloses an automatic drainage control device for underground coal mines, including: a power supply, a water level sensor, an intermediate relay ZJ1, a time delay relay SJ1, and a switch K1 connected to a water pump. The switch K1 includes: a live wire K1.8, a neutral wire K1.9, a ground wire K1.13, a start wire K1.1, and a self-protection wire K1.2 connected to the connection between the start button and the stop button. The switch K1 is connected to the power supply, the intermediate relay ZJ1, and the time delay relay SJ1.

[0005] However, these automated drainage systems require PLCs or other controllers and water level sensors, resulting in high investment costs. Furthermore, the drainage points at old ponds are not permanent (it takes an average of 3 months to complete the drainage of water from one working face of an old pond), and the automated drainage system equipment needs to be moved and debugged after the location is changed. Summary of the Invention

[0006] The technical problem to be solved by this invention is how to realize the automatic shut-off and start-up of the power supply system for the old pond drainage.

[0007] The present invention solves the above-mentioned technical problems through the following technical means:

[0008] This invention proposes a coal mine drainage system, the system comprising a power supply switch circuit and a drainage device, wherein the power supply switch circuit is connected to the drainage device via a magnetic starter;

[0009] The power supply switch circuit includes a time delay relay. The protection output point of the power supply protector and the normally closed contact of the power supply auxiliary are connected to the coil circuit of the time delay relay. A rotary switch is connected in series between the time delay relay and the power supply protector. The normally closed contact of the time delay relay is connected to the power supply reset button, and the normally open contact is connected to the power supply closing button.

[0010] The drainage device includes drainage equipment, a pneumatic knife gate valve, and a gate valve control device. The drainage pipeline from the old pond is connected to the inlet of the drainage equipment. The outlet of the drainage equipment is connected to a check valve and then connected to the central pump room. The gate valve control device is connected to the pneumatic knife gate valve, and the pneumatic knife gate valve is installed on the drainage pipeline from the old pond.

[0011] The selective closing system of the power supply switch circuit in this invention uses the power supply switch protection point and the normally closed closing auxiliary point as the prerequisite and exit condition for automatic closing. It cleverly utilizes the normally open and normally closed points of the time-delay relay to simulate the entire process of manual switch closing, achieving safe and reliable selective closing of the power supply switch. Furthermore, only one time-delay relay needs to be added to the circuit; this relay is small, low-cost, and easy to install and debug. By setting up a pneumatic knife gate valve and gate valve control equipment, and changing the inlet and outlet air passages of the pneumatic knife gate valve on the old pond's drainage pipeline, the opening and closing of the drainage pipeline can be achieved. This invention can easily realize automatic power-on start-up drainage and automatic water shut-off functions, achieving unattended operation at the drainage site.

[0012] Furthermore, the drainage equipment includes a main drainage pump and a secondary drainage pump, wherein the automatic drainage level start detector of the main drainage pump is lower than the automatic drainage level start detector of the secondary drainage pump;

[0013] Water from the old pond enters the inlet of the main drainage pump and the auxiliary drainage pump. The outlets of the main drainage pump and the auxiliary drainage pump are connected to the inlet of the main drainage pipe after the check valve is closed.

[0014] Furthermore, the gate valve control device includes a drainage pipeline, which includes a first pipeline and a second pipeline. The first pipeline is arranged along the water flow direction, and the second pipeline is connected to the wall of the first pipeline.

[0015] A float is installed in the first pipeline, and the float is counterweighted.

[0016] A baffle is arranged in the second pipeline, and a sealing hole is opened on the baffle. A pneumatic two-position four-way reversing valve is arranged above the baffle. The valve stem of the pneumatic two-position four-way reversing valve passes through the sealing hole and is flexibly connected to the float.

[0017] The pressure port and return port of the pneumatic two-position four-way reversing valve are connected to the air source, and the two output ports of the pneumatic two-position four-way reversing valve are respectively connected to the air supply port and return port of the pneumatic knife gate valve.

[0018] Furthermore, the inlet of the first pipeline is connected to the outlet of the drainage equipment, and the outlet of the first pipeline is connected to the central pump room.

[0019] Furthermore, a first annular connector is connected between the valve stem and the float.

[0020] Furthermore, a second annular connector is connected between the float and the corner of the drainage pipe, the corner being the connection point between the first pipe and the second pipe.

[0021] Furthermore, the angle between the second pipeline and the first pipeline satisfy .

[0022] Furthermore, the gate valve control device includes an electromagnetic pneumatic directional valve, a transformer, and an air source. The secondary side of the transformer is connected in series with a fuse and then connected to the coil of the electromagnetic pneumatic directional valve. The pressure port and return port of the electromagnetic pneumatic directional valve are connected to the air source. The two output ports of the pneumatic two-position four-way directional valve are respectively connected to the air supply port and return port of the pneumatic knife gate valve.

[0023] Furthermore, the air source is connected to the electromagnetic pneumatic directional valve via a PVC hose and a first conversion connector, and the interface of the pneumatic knife gate valve is connected to the electromagnetic pneumatic directional valve via a second conversion connector.

[0024] Furthermore, the controller is a transformer for controlling the electromagnetic force starter of the water pump.

[0025] The advantages of this invention are:

[0026] (1) The selective closing system of the power supply switch circuit set in this invention uses the power supply switch protection point and the normally closed closing auxiliary point as the prerequisite and exit condition for automatic closing. It cleverly utilizes the normally open and normally closed points of the delayed connection relay to simulate the entire process of manual closing of the switch, so as to realize the safety and reliability of selective closing of the power supply switch. Moreover, only one delayed time relay needs to be added to the circuit. The relay is small in size, low in cost, and easy to install and debug. By setting up a pneumatic knife gate valve and gate valve control equipment, the opening and closing of the water discharge pipeline can be realized by changing the air inlet and outlet passage of the pneumatic knife gate valve on the old pond water discharge pipeline. This invention can easily realize the automatic power-on start drainage and automatic water shut-off functions, so as to realize unattended operation at the drainage site.

[0027] (2) When the power supply system is interrupted, there will be no water flow in the drainage pipeline. This invention takes advantage of this feature after the power outage and sets up a float trigger device in the water pump drainage pipeline to trigger the pneumatic two-position four-way reversing valve, change the air inlet and outlet passage of the pneumatic knife gate valve on the old pond water discharge pipeline, and realize the opening and closing of the water discharge pipeline.

[0028] (3) For drainage systems with a large number of drainage pumps, the present invention controls the pneumatic knife gate valve by setting an electromagnetic pneumatic reversing valve. The power supply of the electromagnetic pneumatic reversing valve is taken from the secondary side of the transformer. The gas passage of the electromagnetic pneumatic reversing valve can be switched between the two states of the electromagnetic valve being energized and de-energized, so as to realize the opening and closing of the pneumatic knife gate valve.

[0029] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0030] Figure 1 This is a structural diagram of the power supply switch circuit in the first embodiment of the present invention;

[0031] Figure 2 This is a structural diagram of the time relay contact in the first embodiment of the present invention;

[0032] Figure 3 This is a circuit diagram of the closing button and reset button in the first embodiment of the present invention;

[0033] Figure 4 This is a structural diagram of the drainage device in the second embodiment of the present invention;

[0034] Figure 5 This is a structural diagram of the gate valve control device in the second embodiment of the present invention;

[0035] Figure 6 This is a structural diagram of the drainage device in the third embodiment of the present invention.

[0036] In the picture:

[0037] 1-Old pond water inlet and outlet pipeline; 2-Pneumatic knife gate valve; 3-Main drainage pump; 4-Auxiliary drainage pump; 5-First check valve; 6-Second check valve; 7-Drainage pipeline; 71-First pipeline; 72-Second pipeline; 8-Float; 9-Baffle; 10-Pneumatic two-position four-way directional valve; 11-First annular connector; 12-Second annular connector; 13-Air source; 14-Transformer; 15-Fuse; 16-Solenoid pneumatic directional valve. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, 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.

[0039] like Figure 1 As shown, the first embodiment of the present invention proposes a coal mine drainage system, the system including a power supply switch circuit and a drainage device, wherein the power supply switch circuit is connected to the drainage device via a magnetic starter;

[0040] The power supply switch circuit includes a time delay relay. The protection output point of the power supply protector and the normally closed contact of the power supply auxiliary are connected to the coil circuit of the time delay relay. A rotary switch is connected in series between the time delay relay and the power supply protector. The normally closed contact of the time delay relay is connected to the power supply reset button, and the normally open contact is connected to the power supply closing button.

[0041] The drainage device includes drainage equipment, a pneumatic knife gate valve 2, and a gate valve control device. The old pond water drainage pipeline 1 is connected to the inlet of the drainage equipment. The outlet of the drainage equipment is connected to a check valve and then connected to the central pump room. The gate valve control device is connected to the pneumatic knife gate valve 2. The pneumatic knife gate valve 2 is installed on the old pond water drainage pipeline.

[0042] Specifically, such as Figure 1 As shown, XN is a rotary switch. When the rotary switch is open, the automatic closing main control circuit is disconnected. J1-1 is the normally open output contact of the power supply protection, and DL-1 is the normally closed auxiliary contact of the power supply switch contactor. Both are connected to the coil circuit of the time delay relay. The DC12V of the time delay relay coil comes from the power supply switch protector. The normally closed contact of the time delay relay is connected to the power supply reset button, and the normally open contact is connected to the power supply closing button.

[0043] The operating procedure is as follows: After power is restored from the upstream unit, the feeder switch begins a self-test. If no fault is found during the self-test, the normally open contact of the feeder switch protector changes to a normally closed contact. The time delay relay coil is energized and begins timing, and the feeder reset button is closed. After the timing expires, the normally closed contact of the time delay relay opens, completing the reset action. The normally open contact closes, the feeder closing button closes, and the feeder is closed. After closing, the feeder closing auxiliary contact connected in series in the main control circuit opens, the time delay relay coil is de-energized, and the main control circuit exits. After the feeder is de-energized, the next detection and closing cycle begins.

[0044] This solution enables selective automatic closing of the power supply after a power outage and subsequent power restoration, provided that there are no faults in the switches and loads at the drainage site. Furthermore, the automatic closing device must be deactivated after closing, without affecting the protection shutdown function during switch operation.

[0045] Furthermore, after the electro-optical explosion-proof feeder switch is powered on again, the normal manual operation steps are as follows: first press the reset button and then release it; after the switch completes its self-test, press the closing button and release it; if the switch is fault-free, the power supply is successful.

[0046] In this embodiment, selective automatic closing needs to simulate: after the reset button is pressed and released, after a delay, the closing button is pressed and released again. After closing, the magnetic starter is energized, and the drainage device closes to drain water according to the water level. Therefore, the goal of the selective closing design is: after the power supply is energized, the reset point (normally open) is connected and disconnected. After a delay, the closing point (normally open) is pressed to connect and disconnect. After the switch is closed, it automatically closes and exits the working state, and is put back into operation after power is restored.

[0047] The working principle of the power supply switch circuit in this embodiment is as follows:

[0048] like Figure 2 As shown, the time delay relay has normally closed contacts 1 and 4, normally open contacts 1 and 3, and power input terminals 2 and 7. After being powered on, it starts to delay according to the set time. When the time is up, the corresponding normally open contact becomes normally closed and the normally closed contact opens.

[0049] After the power supply switch is powered on, it performs a self-test. If there is no fault in the switch or the line, protection point J1-1 changes from normally open to normally closed, the time relay coil is energized, and normally closed point J2-2 opens, preparing for closing. When the closing button is pressed, the closing coil outputs, and the switch closes. When opening, pressing the opening button J2-1 closes, the opening coil outputs, and the switch opens.

[0050] like Figure 3 As shown, the principle of the reset button's press and release action is as follows: After the switch is powered on, the normally closed contact M-2 of the time relay shorts FG, realizing the press action of the power supply switch reset button. After the time relay's timing expires, the normally closed contact M-2 opens, realizing the release action of the power supply reset button.

[0051] The principle of pressing and releasing the closing button: After the timer of the delay relay expires, the normally open contact M-1 changes from normally open to normally closed, completing the pressing action of the closing button. After the switch is closed, the auxiliary normally closed contact of the feeder switch contactor opens, the main control circuit of automatic closing is de-energized, the normally open contact M-1 of the time relay opens, the closing button release action is completed, and the automatic closing is disengaged.

[0052] In addition, such as Figure 4 As shown, based on the disclosure of the first embodiment above, a second embodiment of the present invention is proposed, which is applicable to a dual-pump drainage system.

[0053] In this embodiment, the drainage device includes a drainage device, a pneumatic knife gate valve 2, and a gate valve control device. The old pond water drainage pipeline 1 is connected to the inlet of the drainage device. The outlet of the drainage device is connected to a check valve and then connected to the central pump room. The gate valve control device is connected to the pneumatic knife gate valve 2. The pneumatic knife gate valve 2 is installed on the old pond water drainage pipeline.

[0054] The drainage equipment includes a main drainage pump 3 and an auxiliary drainage pump 4, wherein the automatic drainage level start detector of the main drainage pump 3 is lower than that of the auxiliary drainage pump 4.

[0055] Water from the old pond enters the inlet of the main drainage pump 3 and the auxiliary drainage pump 4. The outlets of the main drainage pump 3 and the auxiliary drainage pump 4 are connected to the inlet of the main drainage pipe after the first check valve 5 and the second check valve 6 are closed.

[0056] It should be noted that the model of the pneumatic knife gate valve 2 is PZ673H-16C DN150. In the dual-pump drainage system, the discharge volume of the old pond is greater than the drainage capacity of one pump but less than the drainage capacity of two pumps. The drainage system is divided into a main drainage pump 3 and an auxiliary drainage pump 4. When the automatic drainage level start detector of the main drainage pump is lower than that of the auxiliary pump, the main drainage pump 3 drains water when the water level is low, and the auxiliary drainage pump 4 starts after the water level rises.

[0057] Specifically, the starting water level of the main drainage pump 3 is lower than that of the auxiliary pump. The outlet of the main drainage pump 3 and the outlet of the auxiliary drainage pump 4 enter the main drainage main pipe after the first check valve 5 and the second check valve 6 are closed respectively. The main drainage main pipe is connected to the gate valve control equipment.

[0058] In one embodiment, such as Figure 5 As shown, the gate valve control device includes a drainage pipeline 7, which includes a first pipeline 71 and a second pipeline 72. The first pipeline 71 is arranged along the water flow direction, and the second pipeline 72 is connected to the wall of the first pipeline 71.

[0059] A float 8 is installed in the first pipeline 71, and the float 8 has a counterweight inside;

[0060] A baffle 9 is arranged in the second pipeline 72. A sealing hole is opened on the baffle 9. A pneumatic two-position four-way reversing valve 10 is arranged above the baffle 9. The valve stem of the pneumatic two-position four-way reversing valve 10 passes through the sealing hole and is flexibly connected to the float 8.

[0061] The pressure port and return port of the pneumatic two-position four-way reversing valve 10 are connected to the air source 13, and the two output ports of the pneumatic two-position four-way reversing valve 10 are respectively connected to the air supply port and the air return port of the pneumatic knife gate valve 2.

[0062] It should be noted that the power sources for underground equipment are mainly electricity and compressed air. Mine power supply systems are complex, and the power supply to drainage points may come from a higher-level distribution point. There are many user units and locations, and power outages are frequent due to construction needs or malfunctions. Therefore, using electricity to drive gate valves is unreliable. Mine pneumatic power comes from the surface compressed air room, which typically has backup compressed air units and a dual-circuit power supply, making compressed air outages unlikely. Therefore, compressed air is reliable, and pneumatic knife gate valves that can be driven by compressed air should be selected.

[0063] Since the float is driven by the drainage in the pipeline, the water pressure and the movement trajectory of the float after impact are varied. Rigid connections have a large impact force on the connection and are prone to jamming. Soft connections can adapt well to the variability of the water impact angle and are also convenient for the implementation of this device. Only the length of the connecting rod and the diameter of the float need to be determined.

[0064] Furthermore, the pneumatic knife gate valve 2 consists of a cylinder and a gate valve. The pneumatic inlet and outlet ports connect to the two outlet passages of the two-position four-way valve. The pneumatic two-position four-way valve stem has two working positions; pulling out or pressing down the stem switches between the two positions, i.e., switching between two gas passages, one normally open and one normally closed. This achieves the switching of the cylinder's air supply passage, thereby enabling the gate valve to move up and down, opening or closing the gate valve.

[0065] By setting up a partition 9 with a sealing hole, the valve stem of the pneumatic two-position four-way directional valve 10 passes through the sealing hole and connects to the float 8, ensuring the sealing of the second pipeline 72 and preventing water from flowing out of the second pipeline 72.

[0066] If the system loses power, there will be no water flow in the drainage pipe 7. Taking advantage of this characteristic after the power outage, a float ball 8 is installed in the water pump drainage pipe 7. The diameter of the float ball 8 is smaller than the inner diameter of the second pipe 72. It is used to trigger the pneumatic two-position four-way reversing valve 10, change the air inlet and outlet passage of the pneumatic knife gate valve 2 on the old pond water discharge pipe, and realize the opening and closing of the water discharge pipe.

[0067] In one embodiment, the inlet of the first pipe 71 is connected to the outlet of the main drainage pipe, and the outlet of the first pipe 71 is connected to the central pump room.

[0068] In one embodiment, the weight of the counterweight inside the float 8 is such that the pneumatic two-position four-way directional valve 10 can pull the valve stem of the pneumatic directional valve when there is no water in the pipeline.

[0069] In one embodiment, a first annular connector 11 is connected between the valve stem and the float 8.

[0070] It should be noted that the ring connection is a specific implementation of the soft connection, and those skilled in the art can choose other soft connection methods according to the actual situation.

[0071] In one embodiment, a second annular connector 12 is connected between the float 8 and the corner of the drain pipe 7, wherein the corner is the connection point between the first pipe 71 and the second pipe 72.

[0072] It should be noted that after the float 8 is fixed to the corner of the pipeline via the second annular connector 12, the rotatable angle between the float and the annular connector increases. If it is fixed elsewhere, the connector may be blocked by the corner of the pipeline when the float floats on the water.

[0073] In one embodiment, the angle between the second conduit 72 and the first conduit 71 is... satisfy .

[0074] In this embodiment, after the second pipe 72 is connected to the first pipe 71, a Y-shaped structure is formed instead of a T-shaped structure. This is mainly to maximize the adaptation to the direction of water flow. The float is impacted by the water coming from the pipe and moves in a circular motion along the float connecting rod. When it approaches the interface of the second pipe 72 of the Y-shaped device, it moves upward under buoyancy and triggers the pneumatic reversing valve. In addition, the length of the second annular connector + the diameter of the float is less than or equal to the inner diameter of the second pipe, and the inclination angle of the second pipe 72 is consistent with the water flow, ensuring smooth movement of the float and reducing the possibility of jamming.

[0075] In this embodiment, the drainage device operates as follows: Two submersible sand-draining pumps are installed in a water-filled tank. The upper stage of each pump is a magnetic starter with automatic water level control. After the main drainage pump 3 starts draining water, the water in the drainage pipe 7 impacts the float 8. The float 8 drives the valve stem to switch to a pneumatic two-position four-way valve. Gas enters the lower chamber of the pneumatic knife gate valve 2, opening the knife gate valve and allowing old pond water to enter the water tank, thus starting the drainage system. After the pump power is cut off, the water flow in the drainage pipe 7 disappears. The float 8 falls under its own weight, pulling the valve stem of the pneumatic two-position four-way reversing valve 10 to switch the air supply path of the pneumatic knife gate valve 2. Gas enters the upper chamber of the knife gate valve, closing it. After the pump is powered on, the drainage system is pneumatically activated, and the knife gate valve opens to release water into the next cycle.

[0076] In addition, such as Figure 6As shown, based on the content disclosed in the first embodiment above, a third embodiment of the present invention is proposed, which is applicable to drainage systems with a large number of drainage pumps.

[0077] In this embodiment, the drainage device includes a drainage device, a pneumatic knife gate valve 2, and a gate valve control device. The old pond water drainage pipeline 1 is connected to the inlet of the drainage device. The outlet of the drainage device is connected to a check valve and then connected to the central pump room. The gate valve control device is connected to the pneumatic knife gate valve 2. The pneumatic knife gate valve 2 is installed on the old pond water drainage pipeline.

[0078] The drainage equipment includes multiple drainage pumps. The outlet of each drainage pump is connected to the inlet of the main drainage pipe after the check valve is closed. The outlet of the main drainage pipe is connected to the central pump room.

[0079] The gate valve control device includes an electromagnetic pneumatic reversing valve 16, a transformer 14, and an air source 13. The secondary side of the transformer 14 is connected to the coil of the electromagnetic pneumatic reversing valve 16 after a fuse 15 is connected in series. The pressure port and return port of the electromagnetic pneumatic reversing valve 16 are connected to the air source 13. The two output ports of the pneumatic two-position four-way reversing valve 10 are respectively connected to the air supply port and the air return port of the pneumatic knife gate valve 2.

[0080] In this embodiment, the electromagnetic pneumatic reversing valve 16 is model 4V210-08 AC110V. A fuse 15 is connected in series with the 24V secondary side of the transformer 14 to supply power to the coil of the electromagnetic pneumatic reversing valve 16, preventing the coil of the electromagnetic pneumatic reversing valve 16 from burning out. After the primary side of the transformer 14 is powered on, the coil is energized and reversed. The gas passage of the explosion-proof electromagnetic pneumatic reversing valve 16 can be switched between the two states of the solenoid valve being energized and de-energized, so as to realize the opening and closing of the pneumatic knife gate valve 2.

[0081] In one embodiment, the air source 13 is connected to the electromagnetic pneumatic directional valve 16 via a PVC hose and a first conversion connector, and the interface of the pneumatic knife gate valve 2 is connected to the electromagnetic pneumatic directional valve 16 via a second conversion connector.

[0082] Specifically, the connection between the electromagnetic pneumatic directional valve 16 and the pneumatic knife gate valve 2 is a threaded interface, while the connection between the valve and the air source 13 is a quick-connect interface.

[0083] Specifically, since the interface specifications of the air source 13, the electromagnetic pneumatic reversing valve 16 and the pneumatic knife gate valve 2 are different, a conversion connector is set during connection in this embodiment to achieve correct connection.

[0084] In one embodiment, the controller is a water pump electromagnetic starter control transformer 14.

[0085] The working principle of the drainage device in this embodiment is as follows:

[0086] After the magnetic starter powered by the water pump is energized, the electromagnetic pneumatic directional valve 16 is energized, driving the valve stem to move, switching the air supply path of the pneumatic knife gate valve 2, opening the pneumatic knife gate valve 2 to release water, and the water pump pneumatically drains water when the water level reaches the drainage line. After the water level drops to the lower drainage limit, the water pump stops, continues to release water, and then restarts.

[0087] When the magnetic starter is de-energized, the electromagnetic pneumatic reversing valve 16 loses power, the electromagnetic pneumatic reversing valve 16 reverses, the air supply path of the pneumatic knife gate valve 2 is switched, and the pneumatic knife gate valve 2 closes to stop water discharge.

[0088] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0089] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0090] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A coal mine drainage system, characterized in that, The system includes a power supply switch circuit and a drainage device, wherein the power supply switch circuit is connected to the drainage device via a magnetic starter; The power supply switch circuit includes a time delay relay. The protection output point of the power supply protector and the normally closed contact of the power supply auxiliary are connected to the coil circuit of the time delay relay. A rotary switch is connected in series between the time delay relay and the power supply protector. The normally closed contact of the time delay relay is connected to the power supply reset button, and the normally open contact is connected to the power supply closing button. The drainage device includes drainage equipment, a pneumatic knife gate valve, and a gate valve control device. The drainage pipeline from the old pond is connected to the inlet of the drainage equipment. The outlet of the drainage equipment is connected to a check valve and then connected to the central pump room. The gate valve control device is connected to the pneumatic knife gate valve. The pneumatic knife gate valve is installed on the drainage pipeline from the old pond. The gate valve control device includes a drainage pipeline, which includes a first pipeline and a second pipeline. The first pipeline is arranged along the water flow direction, and the second pipeline is connected to the wall of the first pipeline to form a Y-shaped structure. A float is installed in the first pipeline, and the float is counterweighted. A baffle is arranged in the second pipeline, and a sealing hole is opened on the baffle. A pneumatic two-position four-way reversing valve is arranged above the baffle. The valve stem of the pneumatic two-position four-way reversing valve passes through the sealing hole and is flexibly connected to the float. The pressure port and return port of the pneumatic two-position four-way reversing valve are connected to the air source, and the two output ports of the pneumatic two-position four-way reversing valve are respectively connected to the air supply port and return port of the pneumatic knife gate valve.

2. The coal mine drainage system as described in claim 1, characterized in that, The drainage equipment includes a main drainage pump and a secondary drainage pump, wherein the automatic drainage level start detector of the main drainage pump is lower than that of the secondary drainage pump. Water from the old pond enters the inlet of the main drainage pump and the auxiliary drainage pump. The outlets of the main drainage pump and the auxiliary drainage pump are connected to the inlet of the main drainage pipe after the check valve is closed.

3. The coal mine drainage system as described in claim 1, characterized in that, A first annular connector is connected between the valve stem and the float.

4. The coal mine drainage system as described in claim 1, characterized in that, A second annular connector is connected between the float and the corner of the drainage pipe, where the corner is the connection point between the first pipe and the second pipe.

5. The coal mine drainage system as described in claim 1, characterized in that, Angle between the second pipeline and the first pipeline satisfy .

6. The coal mine drainage system as described in claim 1, characterized in that, The gate valve control device includes an electromagnetic pneumatic directional valve, a transformer, and an air source. The secondary side of the transformer is connected to the coil of the electromagnetic pneumatic directional valve after a fuse is connected in series. The pressure port and return port of the electromagnetic pneumatic directional valve are connected to the air source. The two output ports of the pneumatic two-position four-way directional valve are respectively connected to the air supply port and return port of the pneumatic knife gate valve.

7. The coal mine drainage system as described in claim 6, characterized in that, The air source is connected to the electromagnetic pneumatic directional valve via a PVC hose and a first conversion connector, and the interface of the pneumatic knife gate valve is connected to the electromagnetic pneumatic directional valve via a second conversion connector.

8. The coal mine drainage system as described in claim 6, characterized in that, The transformer is controlled by an electromagnetic starter powered by a water pump.

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