A device for treating petroleum drilling waste liquid

Abstract

The application belongs to the technical field of drilling waste liquid treatment, and discloses a petroleum drilling waste liquid treatment device, which comprises a base fixed on the ground, a filter cylinder fixedly installed on the base, a first filter screen with a middle recess provided at the bottom end, a residue discharging assembly provided at one side of the first filter screen and used for discharging solid residues, a cleaning assembly provided on the first filter screen and used for accelerating filtration and cleaning residues, a treatment cylinder fixedly connected to the bottom end of the filter cylinder and in communication with the top end of the treatment cylinder, the residue discharging assembly in communication with the treatment cylinder, a stirring assembly provided in the treatment cylinder and in transmission connection with the cleaning assembly, an oil discharging assembly provided on the stirring assembly and used for discharging floating oil, a power assembly fixedly installed on the base and in transmission connection with the stirring assembly. The application has the advantages of compact structure, simple operation, convenient use, less demand for manpower, automatic treatment of petroleum drilling waste liquid, improved treatment efficiency, collection of floating oil, reduced environmental pollution and convenient recycling of floating oil.

Description

Technical Field

[0001] This invention relates to the field of drilling waste fluid treatment technology, and more particularly to an oil drilling waste fluid treatment device. Background Technology

[0002] Oil drilling waste fluid treatment is a crucial environmental protection aspect of oil extraction. Drilling waste fluids contain large amounts of harmful substances, such as oils, heavy metals, and chemical additives. Direct discharge without treatment can cause severe environmental pollution. Therefore, the technology and methods for treating oil drilling waste fluids are of paramount importance.

[0003] Traditional wastewater treatment methods often rely on simple sedimentation and filtration processes, but these methods are not ideal for treating drilling wastewater containing large amounts of solid residue and floating oil. Sedimentation processes are time-consuming and fail to completely remove fine solid particles and floating oil; while simple filtration processes easily clog filter screens, requiring frequent cleaning and reducing treatment efficiency.

[0004] While some improved treatment devices have emerged in the existing technology, these devices are often complex in structure, cumbersome in operation, and have limited treatment effects. For example, some devices improve filtration by setting up multiple layers of filters, but cleaning and replacing the filters becomes more difficult; other devices attempt to accelerate the sedimentation of suspended solids in the waste liquid by adding agitation devices, but the agitation process can easily cause floating oil to redisperse into the waste liquid, thus reducing the treatment effect.

[0005] Therefore, there is an urgent need for a new type of oil drilling waste fluid treatment device to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide an oil drilling waste fluid treatment device to solve the problems existing in the prior art.

[0007] To achieve the above objectives, the present invention provides the following solution: The present invention provides an oil drilling waste fluid treatment device, comprising:

[0008] The base is fixed to the ground and serves as the fixed foundation and frame of the device;

[0009] A filter cylinder is fixedly installed on the base. The bottom end of the filter cylinder is provided with a first filter screen with a central depression. A slag discharge component for discharging solid residue is provided on one side of the first filter screen. A cleaning component for accelerating filtration and cleaning residue is provided on the first filter screen.

[0010] The processing cylinder is fixed to the bottom end of the filter cylinder, and the bottom end of the filter cylinder is connected to the top end of the processing cylinder through the first filter screen. The slag discharge component is connected to the processing cylinder. The processing cylinder is equipped with a stirring component that is pulsatorically connected to the cleaning component. The stirring component is equipped with an oil discharge component for discharging floating oil.

[0011] A power assembly is fixedly mounted on the base and is connected to the stirring assembly via a transmission connection.

[0012] Preferably, the cleaning component includes a cleaning shaft that is drivenly connected to the stirring component. A plurality of arc-shaped cleaning blades are axially and equally spaced on the cleaning shaft. The end of the cleaning blade away from the cleaning shaft is connected to the inner wall of the filter cylinder, and the bottom end of the cleaning blade is slidably disposed with respect to the top surface of the first filter screen.

[0013] Preferably, a flexible cleaning brush is provided at the bottom end of the cleaning blade, the length of the cleaning brush is greater than the distance between the cleaning blade and the first filter screen, and the cleaning brush slides in contact with the first filter screen.

[0014] Preferably, the slag discharge assembly includes a slag discharge port formed on one edge of the filter, and an inclined slag discharge guide is fixedly connected to the bottom end of the slag discharge port. During the rotation of the cleaning blades, the residue adhering to the first filter screen is swept to the edge position and discharged from the slag discharge port.

[0015] Preferably, the bottom end of the slag discharge conduit is provided with an inclined second filter screen, and the side wall of the slag discharge conduit body is provided with a liquid collection hopper corresponding to the second filter screen. The liquid collection hopper is connected to the inner cavity of the processing cylinder through a one-way valve that opens in one direction.

[0016] Preferably, the stirring assembly includes a stirring shaft rotatably connected to the processing cylinder, the stirring shaft being drive-connected to the power assembly; a plurality of stirring rods are provided on the stirring shaft, and a cleaning plate is fixedly connected between the ends of the stirring rods arranged longitudinally and coaxially away from the stirring shaft, the cleaning plate being in sliding contact with the inner wall of the processing cylinder.

[0017] Preferably, the oil outlet assembly includes an oil storage box that slides longitudinally on the stirring shaft. A plurality of oil collecting rods are fixed to the side wall of the oil storage box. The side wall of the oil collecting rods facing the rotation direction has an oil inlet slit. The oil inlet slit communicates with the inner cavity of the oil storage box through an oil guide groove provided in the oil collecting rod.

[0018] Preferably, the bottom of the inner wall of the oil storage box is provided with a plurality of first oil outlet holes, and a sealing plate is provided in the first oil outlet hole to be slidably sealed with the first oil outlet hole. An elastic rod is fixedly connected to the side of the sealing plate facing the inside of the oil storage box, and the elastic rod is fixedly connected to a fixed plate fixed in the oil storage box.

[0019] Preferably, the stirring shaft has a longitudinally arranged oil guide cavity, and the top of the oil guide cavity has a plurality of second oil inlets corresponding longitudinally to the first oil outlet. When the first oil outlet and the second oil inlets are aligned, the elastic rod pushes the sealing plate to insert into the second oil inlet, and the collected oil enters the oil guide cavity.

[0020] Preferably, the base is provided with an oil outlet box, the stirring shaft passes through the oil outlet box and is rotatably connected to the oil outlet box; the bottom end of the oil guide cavity is connected to the oil outlet box through a plurality of second oil outlet holes.

[0021] Compared with the prior art, the present invention has the following advantages and technical effects: The present invention discloses an oil drilling waste fluid treatment device, mainly used for treating waste fluid generated from oil drilling. It mainly includes a fixed base, on which a filter cylinder, a treatment cylinder and a power component are installed. A cleaning component is installed inside the filter cylinder, and the power component serves as the power source for the cleaning component, assisting in discharging the residue produced by the first filter screen 21 from the slag discharge component, thereby achieving solid-liquid separation of the drilling waste fluid. The separation speed is fast and the separation effect is good. The filtered oily liquid enters the treatment cylinder, and an agent that reacts with the oil is added, causing the oil to separate and float to the surface. It is then collected and discharged through the oil discharge component, achieving oil-water separation. The stirring component is used to stir the oily wastewater, accelerate the reaction, and clean the treatment cylinder to avoid residue, thereby achieving rapid oil-water separation. In specific operation, the waste fluid first enters the filter cylinder, where large solid particles are filtered out by the first filter screen. The filtered liquid then enters the treatment cylinder, where a stirring component is installed to further treat the waste fluid. At the same time, the stirring component also drives the oil discharge component to work, collecting the floating oil in the waste fluid. The power component provides power for the entire device.

[0022] This invention features a compact structure, simple operation, and convenient use, requiring minimal manpower. It enables automated treatment of oil drilling waste fluid, improving processing efficiency. Simultaneously, it can collect floating oil, reducing environmental pollution and facilitating the recycling of floating oil. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0024] Figure 1 This is an axial view of the oil drilling waste fluid treatment device of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the oil drilling waste fluid treatment device of the present invention;

[0026] Figure 3 For the present invention Figure 2 A magnified view of part A in the image;

[0027] Figure 4 For the present invention Figure 2 A magnified view of part B in the image;

[0028] Figure 5 For the present invention Figure 2 A magnified view of part C;

[0029] Figure 6 For the present invention Figure 2 A magnified view of part D;

[0030] Figure 7 For the present invention Figure 2 A magnified view of part E in the image;

[0031] Figure 8 This is a top view of the filter assembly of the present invention;

[0032] Figure 9 This is a schematic diagram of the sealing plate of the present invention;

[0033] In the diagram: 1. Base; 2. Filter cylinder; 3. Processing cylinder; 4. Power assembly; 11. Base plate; 12. Column; 13. Reinforcing rod; 14. Fixing ring; 21. First filter screen; 22. Cleaning shaft; 23. Cleaning blade; 24. Cleaning brush; 25. Slag outlet; 26. Slag outlet guide tube; 27. Second filter screen; 28. Liquid collection hopper; 29. ​​One-way valve; 210. Top cover; 211. Liquid inlet; 31. Stirring shaft; 32. Stirring rod; 33. Cleaning plate; 34. Chemical dosing tank; 35. Oil storage box; 36. Collection... 37. Oil rod; 38. Oil inlet slit; 39. Oil guide groove; 30. First oil inlet hole; 310. First oil outlet hole; 311. Sealing plate; 312. Elastic rod; 313. Telescopic rod; 314. Telescopic spring; 315. Oil guide cavity; 316. Second oil inlet hole; 317. Oil outlet box; 318. Second oil outlet hole; 319. Oil outlet pipe; 320. Liquid level sensor; 321. Buoyancy block; 322. Positioning ring; 323. Fixing plate; 41. Power motor; 42. Drive wheel; 43. Driven wheel; 44. Transmission belt. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Reference Figures 1-9 As shown, this embodiment provides an oil drilling waste fluid treatment device, including:

[0037] Base 1, which is fixed to the ground, serves as the fixed foundation and frame of the device;

[0038] The filter cylinder 2 is fixedly installed on the base 1. The bottom end of the filter cylinder 2 is provided with a first filter screen 21 with a central depression. A slag discharge component for discharging solid residue is provided on one side of the first filter screen 21. A cleaning component for accelerating filtration and cleaning residue is provided on the first filter screen 21.

[0039] The processing cylinder 3 is fixed to the bottom end of the filter cylinder 2. The bottom end of the filter cylinder 2 is connected to the top end of the processing cylinder 3 through the first filter screen 21. The slag discharge component is connected to the processing cylinder 3. The processing cylinder 3 is equipped with a stirring component that is connected to the cleaning component. The stirring component is equipped with an oil discharge component for discharging floating oil.

[0040] Power component 4 is fixedly installed on base 1 and is connected to the stirring component via transmission.

[0041] This invention discloses an oil drilling waste fluid treatment device, mainly used for treating waste fluid generated during oil drilling. It mainly includes a fixed base 1, on which a filter cylinder 2, a treatment cylinder 3, and a power assembly 4 are mounted. A cleaning component is installed inside the filter cylinder 2, and the power assembly 4 provides the power for the cleaning component, assisting in discharging the residue filtered by the first filter screen 21 from the slag discharge component, achieving solid-liquid separation of the drilling waste fluid. The separation speed is fast and the separation effect is good. The filtered oily liquid enters the treatment cylinder 3, where an agent that reacts with the oil is added, causing the oil to separate and float to the surface. The oil is collected and discharged through the oil outlet component, achieving oil-water separation. The stirring component is used to stir the oily wastewater, accelerating the reaction and cleaning the treatment cylinder 3 to avoid residue, thus achieving rapid oil-water separation. In specific operation, the waste liquid first enters the filter cylinder 2, where large solid particles are filtered out by the first filter screen 21. The filtered liquid then enters the treatment cylinder 3, where the stirring component further processes the waste liquid. Simultaneously, the stirring component drives the oil outlet component to collect the floating oil in the waste liquid. The power component 4 provides power to the entire device. This invention has a compact structure, is simple to operate, convenient to use, requires little manpower, and can automate the treatment of oil drilling waste liquid, improving treatment efficiency. It also collects floating oil, reducing environmental pollution and facilitating the recycling of floating oil.

[0042] In one embodiment of this application, the outer wall of the treatment tank 3 is provided with a plurality of dosing tanks 34 for adding agents with different functions to the wastewater; each dosing tank 34 is individually controlled and a certain amount of agent can be added to the treatment tank at different times.

[0043] In one embodiment of this application, the base 1 includes a horizontally placed base plate 11, on which a plurality of columns 12 are provided. The outer walls of the processing cylinder 3 and the filter cylinder 2 are provided with a plurality of fixing rings 14, which are fixedly connected to the reinforcing rods 13 provided between adjacent columns 12, so as to facilitate the fixing of the processing cylinder 3 and the filter cylinder 2 and improve the stability of the device.

[0044] In one embodiment of this application, the power assembly 4 includes a power motor 41 mounted on a base plate 11. The output shaft of the power motor 41 is driven by a drive wheel 42. The drive wheel 42 is driven by a driven wheel 43 via a transmission belt 44. The driven wheel 43 can drive the stirring assembly to rotate.

[0045] In one embodiment of this application, the driving wheel 42 and the driven wheel 43 may be pulleys or sprockets, and the transmission belt 44 may be a belt or chain.

[0046] The cleaning component is further optimized by including a cleaning shaft 22 that is connected to the stirring component for transmission. Several arc-shaped cleaning blades 23 are axially spaced at equal intervals on the cleaning shaft 22. The end of each cleaning blade 23 away from the cleaning shaft 22 communicates with the inner wall of the filter cylinder 2, and the bottom end of each cleaning blade 23 slides against the top surface of the first filter screen 21. The cleaning component includes a cleaning shaft 22 and several cleaning blades 23. The cleaning shaft 22 is connected to a power component 4. When the power component 4 is working, the cleaning shaft 22 drives the cleaning blades 23 to rotate, requiring no additional power and reducing the complexity of the equipment. The bottom end of each cleaning blade 23 slides against the top surface of the first filter screen 21, effectively cleaning away residue adhering to the first filter screen 21 and preventing clogging, thus improving filtration efficiency.

[0047] In one embodiment of this application, reference is made to the appendix. Figure 8 As shown, the cleaning blade 23 is designed in an arc shape along the direction of rotation, which can form a structure similar to a screw conveyor, pushing the filtered solid residue out from the recessed first filter screen 21, and finally discharging it from the slag discharge assembly.

[0048] In one embodiment of this application, the top of the filter cylinder 2 is provided with a top cover 210, and the top cover 210 is provided with an inlet 211 for feeding in drilling waste fluid. The inlet 211 is located directly above the cleaning shaft 22.

[0049] In one embodiment of this application, an annular shielding ring is provided inside the filter cylinder 2. The shielding ring slides in contact with the top of the cleaning blade 23. When the residue is pushed by the cleaning blade 23, the shielding ring can prevent the residue from overflowing and can also squeeze the residue for further dehydration.

[0050] The design is further optimized by incorporating a flexible cleaning brush 24 at the bottom of the cleaning blade 23. The length of the cleaning brush 24 is greater than the distance between the cleaning blade 23 and the first filter screen 21, allowing the cleaning brush 24 to slide in contact with the first filter screen 21. This flexible cleaning brush 24 at the bottom of the cleaning blade 23 allows for more effective cleaning of residues on the first filter screen 21 as the blade rotates, improving the cleaning effect. It also avoids rigid contact between the cleaning blade 23 and the first filter screen 21, preventing scratches and extending the lifespan of the first filter screen 21. Furthermore, it facilitates equipment maintenance and reduces operating costs.

[0051] The design is further optimized by including a slag discharge port 25 located on one edge of the filter element. An inclined slag discharge conduit 26 is fixedly connected to the bottom of the slag discharge port 25. During the rotation of the cleaning blades 23, the residue adhering to the first filter screen 21 is swept to the edge and discharged through the slag discharge port 25. When the cleaning blades 23 sweep the residue to the edge of the filter cylinder 2, the residue enters the slag discharge conduit 26 through the slag discharge port 25 and is then discharged from the device. This achieves automated residue discharge, avoids residue accumulation, and improves processing efficiency.

[0052] To further optimize the design, a second, inclined filter screen 27 is installed at the bottom of the slag discharge conduit 26. A liquid collection hopper 28, corresponding to the second filter screen 27, is installed on the side wall of the slag discharge conduit 26. The liquid collection hopper 28 is connected to the inner cavity of the treatment cylinder 3 via a one-way valve 29 that opens in one direction. When the residue is discharged, it slides down the inclined second filter screen 27. The moisture in the residue and any overflowing moisture are filtered by the second filter screen 27, and the residue is discharged. The wastewater is collected in the liquid collection hopper 28 and then discharged back into the treatment cylinder 3 through the one-way valve 29 for further treatment. This reduces the water content in the discharged residue, improves resource utilization, and reduces environmental pollution from untreated wastewater.

[0053] Further optimization of the design includes a stirring assembly comprising a stirring shaft 31 rotatably connected to the treatment cylinder 3, and the stirring shaft 31 being drive-connected to the power assembly 4. Several stirring rods 32 are mounted on the stirring shaft 31, and a cleaning plate 33 is fixedly connected to the end of each stirring rod 32 that is coaxially arranged longitudinally, away from the stirring shaft 31. The cleaning plate 33 slides in contact with the inner wall of the treatment cylinder 3. The stirring shaft 31 is connected to the power assembly 4. When the power assembly 4 operates, the stirring shaft 31 drives the stirring rods 32 to rotate, stirring the waste liquid inside the treatment cylinder 3, accelerating the mixing speed of the added reagents and wastewater, and facilitating the floating of oil in the water, thus improving the treatment effect of the waste liquid and making it more uniform.

[0054] In one embodiment of this application, a liquid level sensor 320 is provided on the stirring shaft 31. When the liquid level reaches a specified position, an alarm is issued and no new sewage is poured in.

[0055] Further optimization of the design includes an oil collection box 35 that slides longitudinally on a stirring shaft 31. Several oil collecting rods 36 are fixed to the side wall of the oil collection box 35. Each oil collecting rod 36 has an oil inlet slit 37 on its side wall facing the rotation direction. The oil inlet slit 37 communicates with the inner cavity of the oil collection box 35 through an oil guide groove 38 located within the oil collecting rod 36. A buoyancy block 321 is provided at the bottom of the oil collection box 35, allowing it to float on the water surface. The oil collecting rods 36 have oil inlet slits 37. When the stirring rod 32 rotates, the floating oil in the waste liquid enters the oil guide groove 38 within the oil collecting rod 36 through the oil inlet slit 37, and then flows into the oil collection box 35 through the first oil inlet hole 39 for storage. This achieves automated collection of floating oil and reduces environmental pollution.

[0056] Further optimizing the design, the bottom of the inner wall of the oil storage box 35 is provided with several first oil outlet holes 310. A sealing plate 311 is installed inside each first oil outlet hole 310, and it is slidably sealed to the first oil outlet hole 310. An elastic rod 312 is fixedly connected to the side of the sealing plate 311 facing the inside of the oil storage box 35. The elastic rod 312 is fixedly connected to a fixed plate fixed inside the oil storage box 35. When the floating oil in the oil storage box 35 accumulates to a certain amount, the pressure on the sealing plate 311 exceeds the pulling force of the elastic rod 312, causing it to be pushed open. The floating oil then flows out through the first oil outlet hole 310, achieving waste oil cleaning and quantitative discharge of floating oil, thus avoiding the overflow problem caused by excessive floating oil in the oil storage box 35.

[0057] In one embodiment of this application, the end of the sealing plate 311 away from the oil storage box 35 extends out of the oil storage box and slides with the outer wall of the stirring shaft 31, so that the oil storage box 35 cannot be opened when it has not reached the set position, thus avoiding leakage of waste oil.

[0058] A further optimized design includes a longitudinally arranged oil guide cavity 315 on the stirring shaft 31. The top of the oil guide cavity 315 has several second oil inlets 316 corresponding longitudinally to the first oil outlet 310. When the first oil outlet 310 aligns with the second oil inlets 316, the elastic rod 312 pushes the sealing plate 311 into the second oil inlet 316, allowing the collected oil to enter the oil guide cavity 315. When the first oil outlet 310 aligns with the second oil inlet 316, the sealing plate 311 is no longer restricted by the stirring shaft 31 and inserts into the second oil inlet 316, opening the first oil outlet 310 and guiding the floating oil into the oil guide cavity 315. This achieves further collection and transfer of the floating oil, facilitating subsequent floating oil treatment.

[0059] In one embodiment of this application, a positioning ring 322 is designed inside the first oil outlet 310 to achieve the positioning of the sealing plate 311.

[0060] In one embodiment of this application, the elastic rod 312 includes a telescopic rod 313 with telescopic capability. The telescopic rod 313 is connected between the sealing plate 311 and the fixing plate 323. A telescopic spring 314 is sleeved on the telescopic rod 313, and the two ends of the telescopic spring 314 are fixedly connected to the fixing plate 323 and the sealing plate 311, respectively.

[0061] Further optimization of the design involves an oil outlet box 317 mounted on the base 1. A stirring shaft 31 passes through the oil outlet box 317 and is rotatably connected to it. The bottom end of the oil guiding cavity 315 is connected to the oil outlet box 317 via several second oil outlet holes 318. When the floating oil in the oil guiding cavity 315 accumulates to a certain amount, it flows into the oil outlet box 317 through the second oil outlet holes 318 and is then discharged through the oil outlet pipe 319, achieving the final discharge of the floating oil and completing the entire waste liquid treatment process. Simultaneously, the oil outlet box 317 facilitates the collection and subsequent treatment of the floating oil.

[0062] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0063] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A device for treating oil drilling waste fluid, characterized in that, include: The base (1) is fixed on the ground and serves as the fixed foundation and frame of the device; The filter cylinder (2) is fixedly installed on the base (1). The bottom end of the filter cylinder (2) is provided with a first filter screen (21) with a central depression. A slag discharge component for discharging solid residue is provided on one side of the first filter screen (21). A cleaning component for accelerating filtration and cleaning residue is provided on the first filter screen (21). The processing cylinder (3) is fixed to the bottom end of the filter cylinder (2). The bottom end of the filter cylinder (2) is connected to the top end of the processing cylinder (3) through the first filter screen (21). The slag discharge assembly is connected to the processing cylinder (3). The processing cylinder (3) is equipped with a stirring assembly that is connected to the cleaning assembly. The stirring assembly is equipped with an oil discharge assembly for discharging floating oil. The power assembly (4) is fixedly installed on the base (1) and is connected to the stirring assembly in a transmission manner. The cleaning assembly includes a cleaning shaft (22) that is connected to the stirring assembly. Several arc-shaped cleaning blades (23) are axially and equally spaced on the cleaning shaft (22). One end of the cleaning blade (23) away from the cleaning shaft (22) is connected to the inner wall of the filter cylinder (2). The bottom end of the cleaning blade (23) is slidably disposed with the top surface of the first filter screen (21). The bottom end of the cleaning blade (23) is provided with a flexible cleaning brush (24). The length of the cleaning brush (24) is greater than the distance between the cleaning blade (23) and the first filter screen (21). The cleaning brush (24) slides in contact with the first filter screen (21). The slag discharge assembly includes a slag discharge port (25) opened on one side edge of the filter cylinder (2). The bottom end of the slag discharge port (25) is fixedly connected to an inclined slag discharge guide pipe (26). During the rotation of the cleaning blade (23), the residue adhering to the first filter screen (21) is swept to the edge position and discharged from the slag discharge port (25). The bottom end of the slag discharge conduit (26) is provided with an inclined second filter screen (27), and the side wall of the slag discharge conduit (26) is provided with a liquid collection hopper (28) corresponding to the second filter screen (27). The liquid collection hopper (28) is connected to the inner cavity of the processing cylinder (3) through a one-way valve (29) that opens to the processing cylinder (3) in one direction.

2. The oil drilling waste fluid treatment device according to claim 1, characterized in that: The stirring assembly includes a stirring shaft (31) rotatably connected to the processing cylinder (3), and the stirring shaft (31) is connected to the power assembly (4) in a transmission manner; a plurality of stirring rods (32) are provided on the stirring shaft (31), and a cleaning plate (33) is fixedly connected between the ends of the stirring rods (32) arranged longitudinally and coaxially away from the stirring shaft (31), and the cleaning plate (33) slides in contact with the inner wall of the processing cylinder (3).

3. The oil drilling waste fluid treatment device according to claim 2, characterized in that: The oil outlet assembly includes an oil storage box (35) that slides longitudinally on the stirring shaft (31). A plurality of oil collecting rods (36) are fixed to the side wall of the oil storage box (35). The side wall of the oil collecting rods (36) facing the rotation direction is provided with an oil inlet slit (37). The oil inlet slit (37) communicates with the inner cavity of the oil storage box (35) through an oil guide groove (38) provided in the oil collecting rods (36).

4. The oil drilling waste fluid treatment device according to claim 3, characterized in that: The bottom of the inner wall of the oil storage box (35) is provided with a plurality of first oil outlet holes (310). A sealing plate (311) is provided in the first oil outlet hole (310) and is slidably sealed to the first oil outlet hole (310). An elastic rod (312) is fixedly connected to the side of the sealing plate (311) facing the inside of the oil storage box (35). The elastic rod (312) is fixedly connected to a fixing plate fixed in the oil storage box (35).

5. The oil drilling waste fluid treatment device according to claim 4, characterized in that: The stirring shaft (31) is provided with a longitudinally arranged oil guide cavity (315). The top of the oil guide cavity (315) is provided with a plurality of second oil inlets (316) that are longitudinally corresponding to the first oil outlet (310). When the first oil outlet (310) and the second oil inlet (316) are aligned, the elastic rod (312) pushes the sealing plate (311) to insert into the second oil inlet (316), and the collected oil enters the oil guide cavity (315).

6. The oil drilling waste fluid treatment device according to claim 5, characterized in that: An oil outlet box (317) is provided on the base (1), and the stirring shaft (31) passes through the oil outlet box (317) and is rotatably connected to the oil outlet box (317); the bottom end of the oil guide cavity (315) is connected to the oil outlet box (317) through a number of second oil outlet holes (318).

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