A drilling mud separation apparatus for separating drilling cuttings from a drilling fluid and a method of operating the same

Abstract

The present application relates to a kind of cuttings well fluid separation equipment, more particularly to a kind of well fluid separation equipment in drilling cuttings and its operating method, technical implementation scheme of the present application, a kind of well fluid separation equipment in drilling cuttings, including conveyor shell, feeding pipe, lower hopper, transmission shaft, large transmission wheel, small transmission wheel etc.;First drain hole is opened in conveyor shell, discharge port is opened in the side above conveyor shell, feeding pipe is communicated with the side below conveyor shell, lower hopper is connected on feeding pipe, transmission shaft is rotatably connected in the center of conveyor shell, and small transmission wheel is connected to the output shaft of transmission motor.The oil-based cuttings are conveyed upward by the spiral blade, and the liquid in the water storage tank is sprayed on the oil-based cuttings on the spiral blade by the spray head through the water pump, so that the oil-based liquid attached to the cuttings is preliminarily separated from the cuttings.

Description

Technical Field

[0001] This invention relates to a cuttings-fluid separation device, and more particularly to a cuttings-fluid separation device and its operating method. Background Technology

[0002] During the use of oil-based drilling fluids, a large amount of oil-based rock cuttings containing oil-based drilling fluid are generated. Currently, the main methods for treating oil-based rock cuttings are hazardous waste treatment or other methods such as heat treatment, negative pressure oxygen-free treatment, and distillation to extract the liquid. However, the above methods for treating oil-based rock cuttings are all costly, have low processing efficiency, and are not suitable for the rapid treatment of oil-based drilling fluids in small-scale drilling operations. Summary of the Invention

[0003] To overcome the shortcomings of current methods for treating oil-based drilling cuttings, which mainly involve hazardous waste disposal or other methods such as heat treatment, negative pressure anaerobic treatment, and distillation to separate the liquid, the technical problem to be solved is to provide a rapid separation device for drilling fluid in drilling cuttings and its operation method.

[0004] The technical implementation scheme of the present invention is as follows: a drilling cuttings and well fluid separation device, comprising a conveyor housing, a feeding pipe, a hopper, a conveyor shaft, a large conveyor wheel, a small conveyor wheel, a conveyor motor, and spiral blades. The conveyor housing has a first drainage hole, a discharge port on one side above the conveyor housing, a feeding pipe connected to one side below the conveyor housing, a hopper connected to the feeding pipe, a conveyor shaft rotatably connected to the center of the conveyor housing, a small conveyor wheel connected to the output shaft of the conveyor motor, a small conveyor wheel connected to the large conveyor wheel via a belt, spiral blades on the conveyor shaft, and a second drainage hole on the spiral blades.

[0005] Further explanation: It also includes a support ring, a support frame, a barrel shell, an outer hopper, an inner hopper, a discharge shell, a baffle plate, a connecting plate, and a perforated plate. The barrel shell is fixed to the support frame by the support ring. The outer hopper is connected to the top of the barrel shell, and the inner hopper is connected to the inside. A ventilation channel is left between the outer hopper and the inner hopper. The discharge shell is connected to the outer wall of the outer hopper. The conveyor shell is set inside the outer hopper. The perforated plate passes through the conveyor shell and is set inside the inner hopper. The perforated plate is connected to the conveyor shaft by the connecting plate. The baffle plate is connected to the inside of the inner hopper and is located above the perforated plate.

[0006] To further explain, it also includes a water storage tank and a water outlet valve. The water storage tank is mounted on the support frame, and the tank shell is connected to the top of the water storage tank. The water storage tank and the tank shell are connected, and the water outlet valve is connected to the lower side wall of the water storage tank. The water outlet valve is equipped with a valve.

[0007] To further explain, it also includes tracks, a coarse screen, and a filter cloth. There are two elongated holes on one side of the water storage tank, and two tracks are provided inside the water storage tank. A coarse screen is slidably installed in the upper elongated hole and the upper track, and a filter cloth is slidably installed in the lower elongated hole and the lower track.

[0008] To further explain, it also includes nozzles, a water pump, and water pipes. The water pump is installed inside the water storage tank, and multiple nozzles are installed at an angle on the side wall of the conveyor housing. The water outlet pipe of the water pump is connected to the nozzles through the water pipes.

[0009] To further explain, it also includes a top cover, a blower motor, and a fan. The top cover is located above the outer hopper, and the blower motor is located above the top cover. The shaft of the blower motor passes through the top cover and connects to the fan.

[0010] To further explain, it also includes air guide vanes, with multiple air guide vanes installed on the inner wall of the barrel shell.

[0011] To further explain, it also includes a receiving pipe and a cap. The receiving pipe is connected to the outlet below the discharge shell, and a cap is provided below the receiving pipe. One side of the cap is rotatably connected to the outer wall of the receiving pipe, and the other side of the cap can be fixed to the receiving pipe by a detachable pin.

[0012] To further explain, it also includes a bushing, a rotating rod, a torsion spring, and a lever. The bushing is located inside the outer bucket. The rotating rod passes through the inner bucket and is rotatably connected to the bushing. The torsion spring is located inside the bushing. One end of the torsion spring is connected to the rotating rod, and the other end of the torsion spring is connected to the bushing. Multiple levers are connected to the rotating rod.

[0013] An operating method for a drilling cuttings-fluid separation device includes the following steps:

[0014] A. Add an appropriate amount of liquid to the water storage tank, turn on the water pump, conveyor motor, and blower motor. The blower motor drives the fan to blow air into the cavity between the conveyor casing and the outer hopper, inner hopper, and barrel casing. Add the oil-based rock chips to be processed into the lower hopper. The oil-based rock chips flow into the conveyor casing through the feeding pipe. The spiral blades convey the oil-based rock chips upward. The water pump sprays the liquid in the water storage tank onto the oil-based rock chips on the spiral blades through the nozzle, so that the oil-based liquid adhering to the rock chips is initially separated from the rock chips, and the debris on the rock chips is also washed away. As the spiral spacing of the spiral blades gradually decreases, the oil-based rock chips conveyed upward are gradually squeezed and shrunk. The squeezing pressure causes the liquid in the oil-based rock chips to be squeezed out. The air guide arc on the inner wall of the barrel casing directs the air to the first drain hole of the conveyor casing. The air force blows out the fluid in the oil-based rock chips located on the spiral blades inside the conveyor casing. The rock chips flow out from the upper discharge port through the spiral blades.

[0015] B. The rock chips flowing out of the discharge port fall into the orifice plate. The rotation of the orifice plate disperses the rock chips. The air blown by the fan blows the residual fluid of the rock chips into the cavity below the orifice plate. The rock chips separated in the second stage are sent out from the discharge shell.

[0016] C. The fluid flows into the water storage tank. The rock fragments remaining in the fluid fall into the coarse screen above the water storage tank, while the finer rock fragments fall into the filter cloth below. The liquid then flows into the interior of the water storage tank.

[0017] Compared with the prior art, the present invention has the following advantages: The present invention uses spiral blades to convey oil-based rock cuttings upwards, and a water pump sprays the liquid in the water tank onto the oil-based rock cuttings on the spiral blades through a nozzle, so that the oil-based liquid adhering to the rock cuttings is initially separated from the rock cuttings.

[0018] Both the spiral blades and the conveyor housing of this invention are provided with through holes. The oil-based rock fragments conveyed by the spiral blades are gradually squeezed and reduced in size. The squeezing pressure causes the liquid inside the oil-based rock fragments to be squeezed out, thereby realizing the function of physical separation of oil-based rock fragments.

[0019] The invention also includes a powerful blower. The air blown by the fan blows the fluid remaining in the rock cuttings into the cavity below the orifice plate. The air guide vanes on the inner wall of the barrel guide the air to the first drainage hole of the conveyor housing. The air force blows the fluid in the oil-based rock cuttings located on the spiral blades inside the conveyor housing out. The rock cuttings flow out from the upper discharge port through the spiral blades, and the rock cuttings separated in the second stage are sent out from the discharge shell. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0022] Figure 3 This is a three-dimensional structural diagram of the outer and inner hoppers of the present invention.

[0023] Figure 4 This is a three-dimensional structural diagram of the conveyor housing of the present invention.

[0024] Figure 5 This is a three-dimensional structural diagram of the helical blade of the present invention.

[0025] Figure 6 This is a three-dimensional structural diagram of the water storage tank of the present invention.

[0026] Figure 7 This is a three-dimensional structural diagram of the coarse screen and filter cloth of the present invention.

[0027] Figure 8 This is a three-dimensional structural diagram of the rotating rod and lever of the present invention.

[0028] Explanation of reference numerals in the attached drawings: 1: Conveyor casing; 2: First drain hole; 3: Discharge port; 4: Feed pipe; 5: Discharge hopper; 6: Conveyor shaft; 7: Large conveyor wheel; 8: Small conveyor wheel; 9: Conveyor motor; 10: Spiral blade; 11: Second drain hole; 12: Support ring; 13: Support frame; 14: Barrel shell; 15: Outer hopper; 151: Inner hopper; 152: Baffle plate; 153: Discharge shell; 1 6: Connecting plate; 17: Perforated plate; 18: Water storage tank; 181: Long hole; 182: Track; 19: Coarse screen; 20: Filter cloth; 21: Water outlet valve; 22: Nozzle; 23: Water pump; 24: Water pipe; 25: Top cover; 26: Blower motor; 27: Fan; 28: Air guide arc; 29: Material receiving pipe; 30: Screw cap; 31: Bushing; 32: Rotating rod; 33: Torsion spring; 34: Lever. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention. Example

[0030] A drilling cuttings-fluid separation device, such as Figure 1-8As shown, the barrel shell 14 is fixed to the support frame 13 by the support ring 12. Multiple air guide vanes 28 are provided on the inner wall of the barrel shell 14. An outer hopper 15 is connected to the top of the barrel shell 14, and an inner hopper 151 is connected to the inner side. A ventilation channel is provided between the outer hopper 15 and the inner hopper 151. A discharge shell 153 is connected to the outer wall of the outer hopper 15. The conveyor shell 1 is located inside the outer hopper 15. A perforated plate 17 passes through the conveyor shell 1 and is located inside the inner hopper 151. The perforated plate 17 is connected to the conveyor shaft 6 via a connecting plate 16. A baffle plate 152 is connected to the inner side of the 51, and the baffle plate 152 is located above the perforated plate 17. An outer hopper 15 is connected to the upper part of the barrel shell 14. An inner hopper 151 is connected to the inner side of the outer hopper 15. A ventilation channel is left between the outer hopper 15 and the inner hopper 151. A top cover 25 is provided above the outer hopper 15. A blower motor 26 is provided above the top cover 25. The shaft of the blower motor 26 passes through the top cover 25 and is connected to a fan 27. A discharge shell 153 is connected to the outer wall of the outer hopper 15. A receiving pipe 29 is connected to the outlet below the discharge shell 153. A cap 30 is provided below the receiving pipe 29. One side of the cap 30 is rotatably connected to the outer wall of the receiving pipe 29, and the other side of the cap 30 can be fixed to the receiving pipe 29 by a detachable pin. The conveyor housing 1 is set inside the outer hopper 15. The perforated plate 17 passes through the conveyor housing 1 and is set in the inner hopper 151. The perforated plate 17 is connected to the conveyor shaft 6 through the connecting plate 16. A baffle plate 152 is connected to the inner side of the inner hopper 151. The baffle plate 152 is located above the perforated plate 17. A first drainage hole 2 is opened on the conveyor housing 1. A discharge port 3 is opened on one side of the upper part of the housing 1. A feeding pipe 4 is connected to one side of the lower part of the conveyor housing 1. A hopper 5 is connected to the feeding pipe 4. A conveyor shaft 6 is rotated and connected to the center of the conveyor housing 1. The output shaft of the conveyor motor 9 is connected to a small conveyor wheel 8. The small conveyor wheel 8 and the large conveyor wheel 7 are connected by a belt. The conveyor shaft 6 is provided with a spiral blade 10. A second drain hole 11 is opened on the spiral blade 10. The spiral blade 10 contacts the inner wall of the conveyor housing 1. The spiral spacing of the spiral blade 10 gradually decreases from coarse to fine.

[0031] A water storage tank 18 is provided on the support frame 13. A barrel shell 14 is connected to the top of the water storage tank 18 and the water storage tank 18 is connected to the barrel shell 14. A water outlet valve 21 is connected to the lower side wall of the water storage tank 18. A valve is provided on the water outlet valve 21. Two elongated holes 181 are opened on one side of the water storage tank 18. Two tracks 182 are provided inside the water storage tank 18. A coarse screen 19 is slidably arranged in the upper elongated hole 181 and the upper track 182. A filter cloth 20 is slidably arranged in the lower elongated hole 181 and the lower track 182.

[0032] A water pump 23 is installed inside the water storage tank 18. Multiple nozzles 22 are inclined on the side wall of the conveyor housing 1. The water outlet pipe 24 of the water pump 23 is connected to the nozzles 22 through the water pipe 24.

[0033] The outer bucket 15 is provided with a bushing 31. The rotating rod 32 passes through the inner bucket 151 and is rotatably connected to the outer bucket 15 and the bushing 31. The bushing 31 is provided with a torsion spring 33. One end of the torsion spring 33 is connected to the rotating rod 32, and the other end of the torsion spring 33 is connected to the bushing 31. Multiple levers 34 are connected to the rotating rod 32.

[0034] Working principle:

[0035] Add an appropriate amount of liquid to the water storage tank 18, turn on the water pump 23, the conveyor motor 9 and the blower motor 26. The blower motor 26 drives the fan 27 to blow air into the cavity between the conveyor housing 1 and the outer hopper 15, the inner hopper 151 and the barrel shell 14. Add the oil-based rock chips to be processed into the lower hopper 5. The oil-based rock chips flow into the conveyor housing 1 through the feeding pipe 4. The spiral blades 10 convey the oil-based rock chips upward. The water pump 23 sprays the liquid in the water storage tank 18 onto the oil-based rock chips on the spiral blades 10 through the nozzle 22, so that the oil-based liquid adhering to the rock chips is initially separated from the rock chips, and the debris on the rock chips is also washed away. As the spiral spacing of the spiral blades 10 gradually decreases, the oil-based rock chips conveyed upward are gradually squeezed and shrunk. The squeezing pressure causes the liquid in the oil-based rock chips to be squeezed out. The liquid flows out of the conveyor housing 1, and the rock chips flow out from the discharge port 3.

[0036] Rock cuttings flowing out of outlet 3 fall onto orifice plate 17. When the rock cuttings rotate on orifice plate 17 and pass through lever 34, lever 34 separates the clumps of rock cuttings, making the rock cuttings more dispersed and spread evenly on orifice plate 17. When lever 34 is subjected to sufficient pressure, rotating rod 32 will rotate and deflect to prevent lever 34 from breaking. When lever 34 is no longer under pressure, torsion spring 33 rebounds and rotates rod 32 to reset.

[0037] Meanwhile, the lever 34 blade can be replaced with a rotating stirring mechanism to disperse rock chips. The specific mechanism can be switched according to the density of the rock chips. The stirring mechanism can be driven by a motor, and multiple stirring rods can be designed on the lever 34 for rotating crushing (not shown in the plan).

[0038] The air blown by the fan 27 blows the fluid remaining in the rock cuttings into the cavity below the orifice plate 17. The air guide arc 28 on the inner wall of the barrel shell 14 guides the air to the first drain hole 2 of the conveyor shell 1. The air force blows the fluid in the oil-based rock cuttings on the spiral blades 10 inside the conveyor shell 1 out. The rock cuttings flow out from the upper discharge port 3 through the spiral blades 10. The rock cuttings that are separated in the second stage are sent out from the discharge shell 153.

[0039] A cap 30 is provided below the receiving pipe 29 of the discharge shell 153. One side of the cap 30 is rotatably connected to the outer wall of the receiving pipe 29, and the other side of the cap 30 can be fixed to the receiving pipe 29 by a detachable pin. The closed receiving pipe 29 can prevent air leakage. At the same time, the receiving pipe 29 can also store dried rock chips. When the receiving pipe 29 is full of rock chips, the cap 30 can be opened and tools can be used to remove the rock chips from the receiving pipe 29.

[0040] The fluid flows into the water storage tank 18. The rock fragments remaining in the fluid fall into the coarse screen 19 above the water storage tank 18, while the finer rock fragments fall into the filter cloth 20 below. The liquid flows into the interior of the water storage tank 18.

[0041] An operating method for a drilling cuttings-fluid separation device includes the following steps:

[0042] A. Add an appropriate amount of liquid to the water storage tank 18, and turn on the water pump 23, the conveyor motor 9, and the blower motor 26. The blower motor 26 drives the fan 27 to blow air into the cavity between the conveyor casing 1 and the outer hopper 15, the inner hopper 151, and the barrel casing 14. Add the oil-based rock chips to be processed into the lower hopper 5. The oil-based rock chips flow into the conveyor casing 1 through the feed pipe 4. The spiral blades 10 convey the oil-based rock chips upward. The water pump 23 sprays the liquid in the water storage tank 18 onto the oil-based rock chips on the spiral blades 10 through the nozzle 22. The oil-based liquid adhering to the rock cuttings is initially separated from the rock cuttings, and the debris on the rock cuttings is also washed away. As the pitch of the spiral blades 10 gradually decreases, the oil-based rock cuttings conveyed upward are gradually squeezed and reduced in size. The squeezing pressure causes the liquid inside the oil-based rock cuttings to be squeezed out. The air guide arc 28 on the inner wall of the barrel shell 14 guides the air to the first drainage hole 2 of the conveyor shell 1. The air force blows out the fluid inside the oil-based rock cuttings on the spiral blades 10 inside the conveyor shell 1. The rock cuttings flow out from the upper discharge port 3 through the spiral blades 10.

[0043] B. The rock chips flowing out of the discharge port 3 fall into the orifice plate 17. The orifice plate 17 rotates to disperse the rock chips. The air blown by the fan 27 blows the residual fluid of the rock chips into the cavity below the orifice plate 17. The rock chips separated in the second stage are sent out from the discharge shell 153.

[0044] C. The fluid flows into the water storage tank 18. The rock fragments remaining in the fluid fall into the coarse screen 19 above the water storage tank 18, and the finer rock fragments fall into the filter cloth 20 below. The liquid flows into the interior of the water storage tank 18.

[0045] Although the invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims should be given the broadest interpretation so as to cover all variations and equivalent structures and functions.

Claims

1. A drilling cuttings-fluid separation device, characterized in that, It includes a conveyor housing (1), a feeding pipe (4), a hopper (5), a conveyor shaft (6), a large conveyor wheel (7), a small conveyor wheel (8), a conveyor motor (9), and a spiral blade (10). The conveyor housing (1) has a first drainage hole (2), a discharge port (3) on one side above the conveyor housing (1), a feeding pipe (4) connected to one side below the conveyor housing (1), a hopper (5) connected to the feeding pipe (4), a conveyor shaft (6) rotatably connected to the center of the conveyor housing (1), a small conveyor wheel (8) connected to the output shaft of the conveyor motor (9), a small conveyor wheel (8) connected to the large conveyor wheel (7) by a belt, a spiral blade (10) on the conveyor shaft (6), and a second drainage hole (11) on the spiral blade (10). It also includes a support ring (12), a support frame (13), a barrel shell (14), an outer hopper (15), an inner hopper (151), a discharge shell (153), a baffle plate (152), a connecting plate (16), and a perforated plate (17). The barrel shell (14) is fixed to the support frame (13) by the support ring (12). The outer hopper (15) is connected to the top of the barrel shell (14), and the inner hopper (151) is connected to the inside. A ventilation channel is left between the outer hopper (15) and the inner hopper (151). The discharge shell (153) is connected to the outer wall of the outer hopper (15). The conveyor shell (1) is set inside the outer hopper (15). The perforated plate (17) passes through the conveyor shell (1) and is set inside the inner hopper (151). The perforated plate (17) is connected to the conveyor shaft (6) by the connecting plate (16). The baffle plate (152) is connected to the inside of the inner hopper (151). The baffle plate (152) is located above the perforated plate (17). It also includes a water storage tank (18) and a water outlet valve (21). The water storage tank (18) is provided on the support frame (13). The upper part of the water storage tank (18) is connected to the barrel shell (14). The water storage tank (18) is connected to the barrel shell (14). The lower side wall of the water storage tank (18) is connected to the water outlet valve (21). The water outlet valve (21) is provided with a valve. It also includes a track (182), a coarse screen (19) and a filter cloth (20). Two elongated holes (181) are opened on one side of the water storage tank (18). Two tracks (182) are provided inside the water storage tank (18). The coarse screen (19) is slidably installed in the upper elongated hole (181) and the upper track (182), and the filter cloth (20) is slidably installed in the lower elongated hole (181) and the lower track (182). It also includes a nozzle (22), a water pump (23) and a water pipe (24). The water pump (23) is installed in the water storage tank (18). Multiple nozzles (22) are inclined on the side wall of the conveyor housing (1). The water outlet pipe (24) of the water pump (23) is connected to the nozzle (22) through the water pipe (24).

2. The drilling cuttings-fluid separation device according to claim 1, characterized in that, It also includes a top cover (25), a blower motor (26) and a fan (27). The top cover (25) is located above the outer bucket (15), and the blower motor (26) is located above the top cover (25). The shaft of the blower motor (26) passes through the top cover (25) and connects to the fan (27).

3. The drilling cuttings-fluid separation device according to claim 2, characterized in that, It also includes air guide arcs (28), and multiple air guide arcs (28) are provided on the inner wall of the barrel shell (14).

4. The drilling cuttings-fluid separation device according to claim 3, characterized in that, It also includes a receiving pipe (29) and a cap (30). The outlet below the discharge shell (153) is connected to the receiving pipe (29). A cap (30) is provided below the receiving pipe (29). One side of the cap (30) is rotatably connected to the outer wall of the receiving pipe (29), and the other side of the cap (30) is fixed to the receiving pipe (29) by a detachable pin.

5. The drilling cuttings-fluid separation device according to claim 4, characterized in that, It also includes a bushing (31), a rotating rod (32), a torsion spring (33) and a lever (34). The bushing (31) is provided inside the outer bucket (15). The rotating rod (32) passes through the inner bucket (151) and is rotatably connected to the bushing (31) of the outer bucket (15). The torsion spring (33) is provided inside the bushing (31). One end of the torsion spring (33) is connected to the rotating rod (32), and the other end of the torsion spring (33) is connected to the bushing (31). Multiple levers (34) are connected to the rotating rod (32).

6. An operating method for the drilling cuttings-fluid separation equipment according to any one of claims 1-5, characterized in that, Includes the following steps: A. Add an appropriate amount of liquid to the water storage tank (18), turn on the water pump (23), the conveyor motor (9), and the blower motor (26). The blower motor (26) drives the fan (27) to blow air into the cavity between the conveyor housing (1) and the outer hopper (15), inner hopper (151), and barrel shell (14). Add the oil-based rock cuttings to be processed into the lower hopper (5). The oil-based rock cuttings flow into the conveyor housing (1) through the feeding pipe (4). The spiral blades (10) convey the oil-based rock cuttings upward. The water pump (23) sprays the liquid in the water storage tank (18) onto the spiral blades (151) through the nozzle (22). The oil-based rock chips on the 0) allow the oil-based liquid adhering to the rock chips to be initially separated from the rock chips, and can also wash away the debris on the rock chips. As the spiral spacing of the spiral blades (10) gradually decreases, the oil-based rock chips conveyed upward are gradually squeezed and shrunk. The squeezing pressure causes the liquid in the oil-based rock chips to be squeezed out. The air guide arc (28) on the inner wall of the barrel shell (14) guides the air to the first drainage hole (2) of the conveyor shell (1). The air force blows out the fluid in the oil-based rock chips on the spiral blades (10) inside the conveyor shell (1). The rock chips flow out from the upper discharge port (3) through the spiral blades (10); B. Rock cuttings flowing out of the discharge port (3) fall into the orifice plate (17). The orifice plate (17) rotates to disperse the rock cuttings. The air blown by the fan (27) blows the residual fluid of the rock cuttings into the cavity below the orifice plate (17). The rock cuttings separated in the second stage are sent out from the discharge shell (153). C. The fluid flows into the water storage tank (18), and the residual rock fragments in the fluid fall into the coarse screen (19) above the water storage tank (18), while the finer rock fragments fall into the filter cloth (20) below, and the liquid flows into the interior of the water storage tank (18).

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