Drainage device for coal mining working face of coal mine

Abstract

The invention relates to the technical field of coal mining, in particular to a drainage device for a coal mining working face of a coal mine. The drainage device comprises a cylinder body, a filter cover, a filter assembly and a plurality of backflushing assemblies, the filter cover sleeves the lower area of the peripheral wall of the cylinder body, a plurality of through holes for water to pass through are formed in the filter cover, a movable plate and a fixed plate are axially arranged in the cylinder body at intervals, the movable plate is slidably connected into the cylinder body, and the fixed plate is fixedly connected with the cylinder body. And a plurality of connecting holes are formed in the bottom of the cylinder body, and water in the filter cover can be driven to enter the cylinder body through the connecting holes through axial sliding of the movable plate. The filtering assembly is arranged at the bottom of the cylinder body and covers the connecting hole, and the backflushing assembly is arranged in the cylinder body and located between the fixing plate and the connecting hole. The filter assembly is subjected to periodic backwashing through the backwashing assembly, pulverized coal and fine particles attached to the surface of the filter assembly are removed, it is ensured that drainage work is continuously and efficiently conducted, and meanwhile the manual dismounting and cleaning frequency is reduced.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and in particular to a drainage device for coal mining faces. Background Technology

[0002] In coal mining, drainage at the working face is a crucial aspect of ensuring operational safety and production efficiency. Currently, coal mine drainage systems generally use ordinary centrifugal pumps or mud pumps as core equipment. However, the working face environment is complex, and impurities such as coal dust, rock cuttings, and silt from aquifers generated during tunneling operations can enter the drainage system with seepage water. These fine particles and suspended solids easily adhere to the surface of the pump inlet filter screen or deposit in the impeller channels during drainage, leading to gradual equipment blockage.

[0003] Traditional water pumps with fixed filter screens are ill-suited for high-concentration impurities. Coal dust particles easily penetrate the filter screen and accumulate inside the pump chamber, causing impeller wear or flow channel blockage. Blockage necessitates shutdown and manual cleaning of the filter screen or impeller, which is not only time-consuming and labor-intensive but also poses safety hazards in the confined underground space. During maintenance, the drainage system is forced to shut down, preventing timely drainage of water seepage from the working face, which can easily lead to backflow, equipment immersion, or even water inrush accidents, seriously threatening mine safety. The continuous erosion and wear of the pump body and seals by coal dust and hard particles significantly increases equipment failure rates and maintenance costs. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a drainage device for coal mining faces, which solves the technical problems of low filtration efficiency, frequent equipment blockage, difficult manual maintenance, high risk of drainage interruption and short equipment life caused by water with high impurity content.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] This invention provides a drainage device for a coal mining face, comprising a cylinder, a filter cover, a filter assembly, and multiple backflushing assemblies. The filter cover is fitted onto the lower part of the outer peripheral wall of the cylinder, and has multiple through holes for water supply. Movable plates and fixed plates are axially spaced within the cylinder, with the fixed plates closer to the bottom of the cylinder than the movable plates. The movable plates are slidably connected to the cylinder, and the fixed plates are fixedly connected to the cylinder. Multiple connection holes are provided at the bottom of the cylinder. The axial sliding of the movable plates allows water from the filter cover to enter the cylinder through the connection holes. The filter assembly is located at the bottom of the cylinder and covers the connection holes, used to filter the water entering the cylinder. Multiple backflushing assemblies are located within the cylinder and between the fixed plates and the connection holes, used to backflush the filter assembly.

[0009] Preferably, the filter assembly includes a connecting frame and multiple filter screens; the connecting frame is rotatably mounted on the bottom of the cylinder, the multiple filter screens are fixedly connected to the connecting frame, and the multiple filter screens are arranged one-to-one with multiple connecting holes.

[0010] Preferably, the backwash assembly includes a sealing plate, a connecting pipe, a third one-way valve, a cover, and a lifting unit; the top end of the connecting pipe is fixedly connected to the bottom end of the fixed plate, and the connecting pipe, the third one-way valve, and the cover are fixedly connected in sequence, with the lifting unit slidably disposed inside the connecting pipe; the cover is disposed directly above the connecting hole; the fixed plate has a connecting hole for the lifting unit to move, and the sealing plate is disposed between the movable plate and the fixed plate, and fixedly connected to the top end of the lifting unit; when the backwash assembly is working, some water between the movable plate and the fixed plate enters the cover through the connecting pipe and the third one-way valve, and the water discharged from the cover flows through the connecting hole to backwash the corresponding filter screen.

[0011] Preferably, it also includes a buffer assembly; the buffer assembly is detachably connected to the bottom of the filter cover and is connected to the filter screen area corresponding to the bottom of the cover through multiple pipes, for discharging the wastewater generated by backwashing to the outside of the cylinder.

[0012] Preferably, the inner diameter of the cover is the same as the diameter of the filter screen.

[0013] Preferably, it further includes a power assembly; the power assembly includes a transmission unit and a rotation unit; the transmission unit is axially disposed in the cylinder body and is used to drive the movable plate to move axially along the cylinder body to change the distance between the movable plate and the fixed plate; when the distance increases, the filtered water enters between the movable plate and the fixed plate; when the distance decreases, the water between the movable plate and the fixed plate is forced above the movable plate and discharged through the output pipe on the side wall of the cylinder body; the rotation unit is disposed at the bottom of the transmission unit and is used to drive the connecting frame of the filter assembly to rotate around the axis of the connecting frame.

[0014] Preferably, the transmission unit includes a rotating shaft and a bushing; the rotating shaft is provided with an external thread section, the bushing is provided with an internal thread that mates with the external thread section, and the movable plate is fixedly connected to the bushing; by driving the rotating shaft to rotate, the bushing and the movable plate are moved axially along the rotating shaft.

[0015] Preferably, the rotating unit includes a drive shaft and a shaft body; the top end of the drive shaft is fixedly connected to the bottom end of the rotating shaft of the transmission unit; the top end of the shaft body is rotatably connected to the bottom end of the drive shaft, and the bottom end of the shaft body is fixedly connected to the connecting frame of the filter assembly; when the rotating shaft of the transmission unit rotates, it drives the shaft body to rotate through the drive shaft, thereby driving the filter assembly to rotate.

[0016] Preferably, the rotating unit further includes a spring, a prism, and an electromagnet; the bottom section of the drive shaft has a first groove, and the top section of the shaft has a second groove, with the first groove and the second groove communicating with each other; the spring is located in the first groove, with its top end fixedly connected to the top of the first groove and its bottom end fixedly connected to the prism, the prism being slidably disposed in the first groove and the second groove, and the electromagnet being fixedly installed at the bottom of the second groove; when the electromagnet is energized, it attracts the prism to slide downward and stretches the spring, causing the prism to simultaneously engage in the first groove and the second groove, at which point the rotational motion of the drive shaft can be transmitted to the shaft through the prism to drive the filter assembly to rotate.

[0017] Preferably, the movable plate is provided with a first check valve, and the fixed plate is provided with a second check valve;

[0018] The first check valve allows water to flow unidirectionally from the bottom of the movable plate to the top of the movable plate, and the second check valve allows water to flow unidirectionally from the bottom of the fixed plate to the top of the fixed plate.

[0019] (III) Beneficial Effects

[0020] The beneficial effects of this invention are:

[0021] The present invention provides a drainage device for a coal mining face. The drainage device includes a cylinder, a filter cover, a filter assembly, and multiple backwashing assemblies. It can periodically backwash the filter assembly through the backwashing assemblies, effectively removing coal dust and fine particles attached to the surface of the filter assembly, so that the filter assembly can restore its filtration capacity in time and avoid the filter assembly from losing filtration efficiency due to long-term blockage. This ensures that the drainage work can be carried out continuously and efficiently, while reducing the frequency of manual disassembly and cleaning.

[0022] By setting up a graded filtration structure with filter cover and filter components, the through holes of the filter cover can intercept large particulate impurities (such as coal blocks and rock fragments), and the filter components further filter fine coal powder, forming a dual protection system that greatly reduces the possibility of impurities entering the pump body, significantly reduces the probability of equipment blockage, and extends service life.

[0023] Multiple backwash components can clean the filter components in different areas simultaneously or at different times. Even if some filter components are clogged, the others can still maintain the drainage function, avoiding the shutdown of the entire drainage system due to local failure. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a drainage device for a coal mining face according to the present invention.

[0025] Figure 2 This is a schematic diagram of the overall structure of a drainage device for a coal mining face according to the present invention from another perspective.

[0026] Figure 3 This is a partial cross-sectional schematic diagram of a drainage device for a coal mining face according to the present invention.

[0027] Figure 4 This is a cross-sectional schematic diagram of a drainage device for a coal mining face according to the present invention.

[0028] Figure 5 This is a schematic diagram of the power assembly structure;

[0029] Figure 6 This is a partial cross-sectional schematic diagram of the recoil assembly.

[0030] [Explanation of Labels in the Attached Image]

[0031] 1: Cylinder block; 11: Movable plate; 12: Fixed plate; 13: Connecting hole; 14: First check valve; 15: Second check valve;

[0032] 2: Filter cover; 21: Through hole;

[0033] 3: Filter assembly; 31: Connecting bracket; 32: Filter screen;

[0034] 4: Backflush assembly; 41: Sealing plate; 42: Connecting pipe; 43: Third check valve; 44: Cover; 45: Lifting unit; 451: Bracket; 452: Elastic element; 453: Connecting rod; 454: Connecting block;

[0035] 5: Buffer assembly; 51: First annular plate; 52: Second annular plate; 521: Drainage hole; 53: Rubber membrane;

[0036] 6: Power assembly; 61: Transmission unit; 611: Moving shaft; 612: Bushing; 62: Rotating unit; 621: Drive shaft; 6211: First slide groove; 622: Shaft body; 6221: Second slide groove; 623: Spring; 624: Prism; 625: Electromagnet; 626: Sensor; 63: Drive motor;

[0037] 7: Output tube;

[0038] 8: Pipe body;

[0039] 9: Vertical connectors. Detailed Implementation

[0040] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0042] Example:

[0043] like Figure 1 and Figure 3 As shown, this embodiment provides a drainage device for a coal mining face. The drainage device includes a cylinder 1, a filter cover 2, a filter assembly 3, and multiple backflushing assemblies 4. The filter cover 2 is fitted onto the lower part of the outer peripheral wall of the cylinder 1, and there is a gap between the inner annular peripheral wall of the filter cover 2 and the outer annular peripheral wall of the cylinder 1 to allow water flow. Multiple through holes 21 for water flow are provided on the filter cover 2. Movable plates 11 and fixed plates 12 are axially spaced inside the cylinder 1. The fixed plates 12 are closer to the bottom of the cylinder 1 than the movable plates 11, so as to... Figure 3 and Figure 4In terms of orientation, the movable plate 11 is located above the fixed plate 12. The movable plate 11 is slidably connected to the cylinder body 1, and the fixed plate 12 is fixedly connected to the cylinder body 1. Multiple connection holes 13 are provided at the bottom of the cylinder body 1. Through the axial sliding of the movable plate 11, water between the filter cover 2 and the cylinder body 1 can be driven to enter the interior of the cylinder body 1 through the connection holes 13. The filter assembly 3 is located at the bottom of the cylinder body 1 and covers the connection holes 13, used to filter the water entering the cylinder body 1. By setting up a graded filtration structure of the filter cover 2 and the filter assembly 3, the through holes 21 of the filter cover 2 can intercept large particles of impurities such as coal lumps and rock fragments, and the filter assembly 3 further filters fine coal powder, forming a dual protection system that significantly reduces the possibility of impurities entering the pump body, significantly reduces the probability of equipment blockage, and extends service life. Multiple backwashing components 4 are located inside the cylinder body 1 and between the fixed plate 12 and the connection holes 13, used to backwash the filter assembly 3. The backwash assembly 4 periodically backwashes the filter assembly 3, effectively removing coal dust and fine particles adhering to the surface of the filter assembly 3. This allows the filter assembly 3 to quickly restore its filtration capacity, preventing a decrease in filtration efficiency due to long-term clogging. This ensures continuous and efficient drainage while reducing the frequency of manual disassembly and cleaning. Furthermore, multiple backwash assemblies 4 can clean filter assemblies 3 in different areas simultaneously or at different times. Even if some filter assemblies 3 become clogged, the others can still maintain drainage function, preventing the entire drainage system from shutting down due to localized malfunctions.

[0044] like Figure 3 and Figure 4 As shown, the bottom wall of the filter cover 2 is located below the bottom wall of the cylinder body 1, and the bottom wall of the cylinder body 1 and the bottom wall of the filter cover 2 are fixedly connected by at least two vertical connectors 9. The gap between the bottom side wall of the cylinder body 1 and the filter cover 2 forms a channel for water to flow in. Preferably, at least two vertical connectors 9 are integrally formed with the annular outer peripheral wall of the cylinder body 1 and are evenly arranged in the circumferential direction of the cylinder body 1.

[0045] like Figure 4 As shown, the internal space of the cylinder 1 is divided into three chambers by the fixed plate 12 and the movable plate 11: from bottom to top, the first chamber is located between the bottom of the cylinder 1 and the fixed plate 12, the second chamber is located between the fixed plate 12 and the movable plate 11, and the third chamber is located between the movable plate 11 and the top of the cylinder 1.

[0046] Preferably, such as Figure 3As shown, the movable plate 11 is equipped with a first one-way valve 14, and the fixed plate 12 is equipped with a second one-way valve 15. The first one-way valve 14 allows water to flow unidirectionally from the bottom to the top of the movable plate 11, and the second one-way valve 15 allows water to flow unidirectionally from the bottom to the top of the fixed plate 12. This arrangement ensures that water can only flow from the first chamber into the second chamber, and then from the second chamber into the third chamber, thus achieving orderly water transport between chambers while preventing water backflow.

[0047] Water from the coal mining face enters the filter cover 2 through the through hole 21. The water enters the bottom of the cylinder 1 through the channel between the cylinder 1 and the bottom of the filter cover 2. It is filtered by the filter assembly 3. The filtered water enters the first chamber of the cylinder 1 through the connection hole 13, then flows from the second chamber into the third chamber, and finally flows out from the output pipe 7 on the side wall of the cylinder 1.

[0048] like Figure 3 As shown, the filter assembly 3 includes a connecting frame 31 and multiple filter screens 32. The connecting frame 31 is rotatably mounted on the bottom of the cylinder 1, and the multiple filter screens 32 are fixedly connected to the connecting frame 31, with each filter screen 32 corresponding to a different connection hole 13. The rotatable connecting frame 31 drives the multiple filter screens 32 to work in turn, allowing a single filter screen 32 to rotate to the backwashing position when cleaning is required, while the remaining filter screens 32 continue filtering normally, thus achieving uninterrupted continuous operation of the drainage device. Simultaneously, the one-to-one correspondence between the multiple filter screens 32 and the connection holes 13 effectively increases the filtration area, improves drainage efficiency, and enables efficient backwashing.

[0049] In a preferred embodiment of the present invention, eight filter screens 32 and eight connecting holes 13 are provided. The filter screens 32 are evenly distributed along the circumferential direction of the connecting frame 31.

[0050] like Figure 4 and Figure 5 As shown, the drainage device also includes a power assembly 6, which comprises a transmission unit 61 and a rotation unit 62. The transmission unit 61 is axially disposed within the cylinder 1 and is used to drive the movable plate 11 to move axially along the cylinder 1, thereby changing the distance between the movable plate 11 and the fixed plate 12. When the distance increases, filtered water enters between the movable plate 11 and the fixed plate 12, i.e., water from the first chamber enters the second chamber; when the distance decreases, water between the movable plate 11 and the fixed plate 12 is forced above the movable plate 11, i.e., water from the second chamber enters the third chamber and is discharged through the output pipe 7 on the side wall of the cylinder 1. The rotation unit 62 is located at the bottom of the transmission unit 61 and is used to drive the connecting frame 31 of the filter assembly 3 to rotate around the axis of the connecting frame 31.

[0051] like Figure 4As shown, the transmission unit 61 includes a rotating shaft 611 and a bushing 612. The rotating shaft 611 has an external thread section, and the bushing 612 has an internal thread that mates with the external thread section. The movable plate 11 is fixedly connected to the bushing 612. By driving the rotating shaft 611 to rotate, the bushing 612 and the movable plate 11 are moved axially along the rotating shaft 611.

[0052] Preferably, the power assembly 6 further includes a drive motor 63, the output end of which is fixedly connected to the top of the rotating shaft 611 to drive the rotating shaft 611 to rotate.

[0053] like Figure 5 As shown, the rotating unit 62 includes a drive shaft 621 and a shaft body 622. The top end of the drive shaft 621 is fixedly connected to the bottom end of the rotating shaft 611 of the transmission unit 61. The top end of the shaft body 622 is rotatably connected to the bottom end of the drive shaft 621, and the bottom end of the shaft body 622 is fixedly connected to the connecting frame 31 of the filter assembly 3. When the rotating shaft 611 of the transmission unit 61 rotates, it drives the shaft body 622 to rotate through the drive shaft 621, thereby driving the filter assembly 3 to rotate.

[0054] Furthermore, the rotating unit 62 also includes a spring 623, a prism 624, and an electromagnet 625. The bottom section of the drive shaft 621 has a first groove 6211, and the top section of the shaft body 622 has a second groove 6221, with the first groove 6211 and the second groove 6221 communicating with each other. The spring 623 is disposed within the first groove 6211, its top end fixedly connected to the top of the first groove 6211, and its bottom end fixedly connected to the prism 624. The prism 624 is slidably disposed within the first groove 6211 and the second groove 6221. The electromagnet 625 is fixedly installed at the bottom of the second groove 6221.

[0055] When the electromagnet 625 is energized, the adsorption prism 624 slides downward and stretches the spring 623, so that the prism 624 is simultaneously engaged in the first slide groove 6211 and the second slide groove 6221. At this time, the rotational motion of the drive shaft 621 can be transmitted to the shaft body 622 through the prism 624 to drive the filter assembly 3 to rotate.

[0056] Preferably, the rotating unit 62 further includes a sensor 626 and a controller. The sensor 626 is fixed to the top of the first slide 6211 and is used to detect the downward position of the prism 624. When the prism 624 is detected to have descended to the desired position, the sensor 626 transmits a signal to the drive motor 63 through the controller. After receiving the signal, the controller immediately controls the drive motor 63 to perform a fixed-angle rotation, which in turn drives the connecting frame 31 to rotate through the transmission shaft 621 and the shaft body 622, so that the next filter screen 32 to be cleaned rotates into the working area of ​​the backwash assembly 4, thereby realizing the sequential cleaning of the filter screens 32.

[0057] like Figure 6As shown, the backwash assembly 4 includes a sealing plate 41, a connecting pipe 42, a third one-way valve 43, a cover 44, and a lifting unit 45. The top end of the connecting pipe 42 is fixedly connected to the bottom end of the fixed plate 12. The connecting pipe 42, the third one-way valve 43, and the cover 44 are sequentially fixedly connected. The lifting unit 45 is slidably disposed inside the connecting pipe 42. The cover 44 is disposed directly above the connecting hole 13, and the bottom of the cover 44 abuts against the bottom wall of the cylinder 1. The fixed plate 12 has a connecting hole for the lifting unit 45 to move. The sealing plate 41 is disposed between the movable plate 11 and the fixed plate 12, and is fixedly connected to the top end of the lifting unit 45. Part of the water between the movable plate 11 and the fixed plate 12 enters the cover 44 through the connecting pipe 42 and the third one-way valve 43. The water discharged from the cover 44 flows through the connecting hole 13 to backwash the corresponding filter screen 32.

[0058] Furthermore, the lifting unit 45 includes a bracket 451, an elastic element 452, a connecting rod 453, and a connecting block 454. The bracket 451, elastic element 452, and connecting block 454 are arranged sequentially from top to bottom. The bracket 451 is fixedly connected to the inner wall of the connecting pipe 42, and the bracket 451 has a channel inside for the connecting rod 453 to slide. The top end of the connecting rod 453 is fixedly connected to the bottom of the sealing plate 41, and the bottom end is fixedly connected to the connecting block 454. The elastic element 452 is arranged around the connecting rod 453, and both ends of the elastic element 452 abut against the bracket 451 and the connecting block 454, respectively.

[0059] When the movable plate 11 moves downward and compresses the second chamber, the pressure inside the chamber increases, and high-pressure water simultaneously acts on the third one-way valve 43 and the sealing plate 41. When the pressure rises to the opening threshold of the third one-way valve 43, the valve of the third one-way valve 43 opens, and high-pressure water is sprayed out through the connecting pipe 42 and the cover 44, starting to backwash the filter screen 32. At this time, because the total downward pressure generated by the water pressure acting on the entire area of ​​the sealing plate 41 is still less than the pre-tightening force of the elastic element 452, the sealing plate 41 remains open, and backwashing continues. As the movable plate 11 continues to move downward, the pressure in the second chamber further increases. When the total pressure on the sealing plate 41 exceeds the pre-tightening force of the elastic element 452, it will push the connecting rod 453 and the sealing plate 41 downward until the inlet channel of the connecting pipe 42 is completely closed. The upstream water source is cut off, the pressure in the connecting pipe 42 drops, the third one-way valve 43 automatically closes, and the backwashing ends. Subsequently, the downward power of the movable plate 11 will be used entirely to discharge the clean water from the second chamber into the third chamber through the first one-way valve 14, ensuring the efficiency of the main drainage system. This achieves intelligent backflushing operation and effectively guarantees the efficiency of the main drainage system.

[0060] It should be noted that when the movable plate 11 moves upward, the pressure in the second chamber forms a negative pressure relative to the first chamber, and the clean water in the first chamber is drawn in through the first one-way valve 14. At this time, although a small amount of water enters the connecting pipe 42, its pressure is far below the opening threshold of the third one-way valve 43, so backwashing cannot be initiated, and the device is in a single filtration and water intake state.

[0061] Preferably, the inner diameter of the cover 44 is the same as the diameter of the filter screen 32. This ensures that the rinsing range matches the working area of ​​the filter screen, achieving thorough cleaning while avoiding waste of water and energy.

[0062] In a preferred embodiment of the present invention, two recoil components 4 are provided. The two recoil components 4 are arranged symmetrically about the axis of the cylinder block 1.

[0063] like Figure 2 As shown, the drainage device also includes a buffer assembly 5. The buffer assembly 5 is detachably connected to the bottom of the filter cover 2 and is connected to the filter screen 32 area corresponding to the bottom of the cover 44 through multiple pipes 8, for discharging the wastewater generated by backwashing to the outside of the cylinder 1.

[0064] Specifically, such as Figure 4 As shown, the top end of the tube body 8 is spaced apart from the connecting hole 13 on the bottom wall of the cylinder body 1 to provide clearance for the rotation of the filter assembly 3. The bottom end of the tube body 8 is fixedly connected to the bottom wall of the filter cover 2, and the bottom wall of the filter cover 2 is provided with a channel communicating with the tube body 8. Preferably, the tube body 8 and the filter cover 2 are integrally formed.

[0065] Preferably, the buffer assembly 5 includes a first annular plate 51 and a second annular plate 52 coaxially fixed to the bottom of the filter cover 2, and an annular rubber membrane 53 fixed to the bottom of the two annular plates. The second annular plate 52 has multiple drainage holes 521 extending through it, and the outlet ends of the multiple tubes 8 are located between the first annular plate 51 and the second annular plate 52.

[0066] The wastewater generated during backwashing enters the annular chamber between the first annular plate 51 and the second annular plate 52 through the pipe body 8, impacting the rubber membrane 53 and causing it to deform elastically. This deformation process absorbs the impact of the water flow and temporarily stores and buffers the wastewater by expanding the volume of the chamber, thereby significantly reducing the wastewater flow velocity. The buffered wastewater is then gently discharged back into the water area outside the filter cover 2 through the drain hole 521. Through physical buffering and delayed release, the high-speed backwash wastewater containing high concentrations of impurities is effectively prevented from being directly and rapidly re-inhaled into the filtration process, thus significantly reducing the risk of secondary contamination of the filter screen 32 and the frequency of repeated cleaning. Combined with the rotating cleaning mechanism of multiple filter screens 32, this device can perform long-term, high-efficiency, and continuous drainage operations without stopping the machine.

[0067] The working process of the drainage device used in coal mining faces is as follows:

[0068] S1. Wastewater containing impurities from the coal mine working face passes through the filter cover 2, is filtered by the filter screen 32, and becomes clean water, which enters the first chamber through the connection hole 13. The drive motor 63 drives the transmission unit 61 to rotate in the forward direction, causing the movable plate 11 to move upward, so that the pressure in the second chamber is negative relative to the first chamber. When the pressure difference between the first chamber and the second chamber reaches the opening threshold of the second one-way valve 15, the second one-way valve 15 opens, and the clean water enters the second chamber through the second one-way valve 15. At the same time, the forward rotation of the transmission unit 61 can also drive the connecting frame 31 of the filter assembly 3 to rotate through the rotation unit 62, so as to drive the filter screen 32 to rotate by a specific angle.

[0069] S2. The drive motor 63 drives the transmission unit 61 to rotate in the opposite direction, causing the movable plate 11 to move downward and squeeze the second chamber. The pressure in the second chamber increases, and the pressure difference between the first chamber and the second chamber is less than the opening threshold of the second one-way valve 15, causing the second one-way valve 15 to close. When the pressure difference between the second chamber and the third chamber reaches the opening threshold of the first one-way valve 14, the first one-way valve 14 opens, and clean water enters the third chamber through the first one-way valve 14 and is finally discharged from the output pipe 7. At the same time, the high-pressure water flow generated by the downward movement of the movable plate 11 also enters the connecting pipe 42 of the backwash assembly 4 to backwash the filter screen 32 corresponding to the backwash assembly 4.

[0070] S21. When the movable plate 11 moves down, high-pressure water enters the connecting pipe 42 of the backwash assembly 4. When the water pressure in the connecting pipe 42 rises to a certain level, it can open the third one-way valve 43. High-pressure water is sprayed out from the cover 44 to backwash the filter screen 32.

[0071] S22. When the movable plate 11 moves further down, the sealing plate 41 moves down under pressure, automatically cutting off the backwash water flow to the filter screen 32 to stop backwashing.

[0072] S23. The wastewater generated by backwashing enters the buffer assembly 5 through the pipe body 8. The rubber membrane 53 undergoes elastic deformation under the impact of the wastewater, which plays a role in temporary storage and buffering, and finally allows the wastewater to be discharged back to the external water area smoothly and slowly through the drain hole 521.

[0073] S3. Repeat steps S1 and S2 to automatically cycle through the drainage, filter screen 32 rotation and backwashing processes, so as to achieve uninterrupted and continuous drainage of the coal mining face.

[0074] In the description of this invention, it should be understood that 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0075] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0076] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0077] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0078] 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 modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A drainage device for a coal mining face, characterized in that, It includes a cylinder block (1), a filter cover (2), a filter assembly (3), and multiple backwash assemblies (4). The filter cover (2) is fitted onto the lower part of the outer peripheral wall of the cylinder (1), and the filter cover (2) has multiple through holes (21) for water supply. The cylinder (1) is provided with a movable plate (11) and a fixed plate (12) spaced apart along the axial direction. The fixed plate (12) is closer to the bottom of the cylinder (1) than the movable plate (11). The movable plate (11) is slidably connected to the cylinder (1), and the fixed plate (12) is fixedly connected to the cylinder (1). The bottom of the cylinder (1) is provided with a plurality of connecting holes (13). By sliding the movable plate (11) axially, water in the filter cover (2) can be driven to enter the interior of the cylinder (1) through the connecting holes (13). The filter assembly (3) is located at the bottom of the cylinder (1) and covers the connection hole (13) for filtering the water entering the cylinder (1). Multiple backwashing components (4) are disposed inside the cylinder (1) and located between the fixing plate (12) and the connecting hole (13) for backwashing the filter assembly (3).

2. The drainage device for coal mining faces as described in claim 1, characterized in that: The filter assembly (3) includes a connecting frame (31) and multiple filter screens (32); The connecting frame (31) is rotatably mounted on the bottom of the cylinder (1), and a plurality of filter screens (32) are fixedly connected to the connecting frame (31), and the plurality of filter screens (32) are arranged in a one-to-one correspondence with the plurality of connecting holes (13).

3. The drainage device for coal mining faces as described in claim 2, characterized in that: The recoil assembly (4) includes a sealing plate (41), a connecting pipe (42), a third one-way valve (43), a cover (44), and a lifting unit (45). The top end of the connecting pipe (42) is fixedly connected to the bottom end of the fixing plate (12). The connecting pipe (42), the third one-way valve (43) and the cover (44) are fixedly connected in sequence. The lifting unit (45) is slidably disposed inside the connecting pipe (42). The cover (44) is positioned directly above the connecting hole (13); The fixed plate (12) has a connecting hole for the lifting unit (45) to move. The sealing plate (41) is located between the movable plate (11) and the fixed plate (12) and is fixedly connected to the top of the lifting unit (45). When the backwash assembly (4) is working, some water between the movable plate (11) and the fixed plate (12) enters the cover (44) through the connecting pipe (42) and the third one-way valve (43). The water discharged from the cover (44) flows through the connecting hole (13) to backwash the corresponding filter screen (32).

4. The drainage device for coal mining faces as described in claim 3, characterized in that: It also includes a buffer component (5); The buffer assembly (5) is detachably connected to the bottom of the filter cover (2) and is connected to the filter screen (32) area corresponding to the bottom of the cover (44) through multiple tubes (8) for discharging the sewage generated by backwashing to the outside of the cylinder (1).

5. The drainage device for coal mining faces as described in claim 3, characterized in that: The inner diameter of the cover (44) is the same as the diameter of the filter (32).

6. The drainage device for coal mining faces as described in claim 2, characterized in that: It also includes the power component (6); The power assembly (6) includes a transmission unit (61) and a rotation unit (62). The transmission unit (61) is axially disposed inside the cylinder (1) and is used to drive the movable plate (11) to move along the axial direction of the cylinder (1) to change the distance between the movable plate (11) and the fixed plate (12). When the gap increases, filtered water enters between the movable plate (11) and the fixed plate (12); when the gap decreases, the water between the movable plate (11) and the fixed plate (12) is forced above the movable plate (11) and discharged through the output pipe (7) on the side wall of the cylinder (1). The rotating unit (62) is located at the bottom of the transmission unit (61) and is used to drive the connecting frame (31) of the filter assembly (3) to rotate around the axis of the connecting frame (31).

7. The drainage device for a coal mining face as described in claim 6, characterized in that: The transmission unit (61) includes a rotating shaft (611) and a bushing (612). The rotating shaft (611) is provided with an external thread section, the bushing (612) is provided with an internal thread that mates with the external thread section, and the movable plate (11) is fixedly connected to the bushing (612). By driving the rotating shaft (611) to rotate, the bushing (612) and the movable plate (11) are moved along the axial direction of the rotating shaft (611).

8. The drainage device for a coal mining face as described in claim 7, characterized in that: The rotating unit (62) includes a drive shaft (621) and a shaft body (622). The top end of the drive shaft (621) is fixedly connected to the bottom end of the rotating shaft (611) of the drive unit (61); The top end of the shaft (622) is rotatably connected to the bottom end of the drive shaft (621), and the bottom end of the shaft (622) is fixedly connected to the connecting frame (31) of the filter assembly (3). When the rotating shaft (611) of the transmission unit (61) rotates, it drives the shaft body (622) to rotate through the transmission shaft (621), thereby driving the filter assembly (3) to rotate.

9. The drainage device for a coal mining face as described in claim 8, characterized in that: The rotating unit (62) also includes a spring (623), a prism (624), and an electromagnet (625). The bottom section of the drive shaft (621) is provided with a first sliding groove (6211), and the top section of the shaft body (622) is provided with a second sliding groove (6221). The first sliding groove (6211) and the second sliding groove (6221) are interconnected. The spring (623) is disposed in the first slide groove (6211), its top end is fixedly connected to the top of the first slide groove (6211), and its bottom end is fixedly connected to the prism (624). The prism (624) is slidably disposed in the first slide groove (6211) and the second slide groove (6221). The electromagnet (625) is fixedly installed at the bottom of the second slide groove (6221). When the electromagnet (625) is energized, it attracts the prism (624) to slide downward and stretches the spring (623), so that the prism (624) is simultaneously engaged in the first slide groove (6211) and the second slide groove (6221). At this time, the rotational motion of the drive shaft (621) can be transmitted to the shaft body (622) through the prism (624) to drive the filter assembly (3) to rotate.

10. The drainage device for a coal mining face as described in claim 6, characterized in that: The movable plate (11) is provided with a first one-way valve (14), and the fixed plate (12) is provided with a second one-way valve (15). The first one-way valve (14) allows water to flow unidirectionally from the bottom of the movable plate (11) to the top of the movable plate (11), and the second one-way valve (15) allows water to flow unidirectionally from the bottom of the fixed plate (12) to the top of the fixed plate (12).

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