A primary oil recovery filtration device and method of use

Abstract

The present application relates to the technical field of petroleum processing, in particular to a kind of petroleum collection primary filter device and its using method, including foot stool and the box body being fixedly connected on foot stool, box cover is connected by bolt on box body, several fixed short poles are fixedly connected on the inner side wall of box body, several fixed short poles are equidistantly arranged around box body central axis, several filter plate fixed vertical poles are fixedly connected to the end of several fixed short poles away from the inner side wall of box body, and several filter plate fixed vertical poles are equidistantly arranged around box body central axis.The present application can continuously filter crude oil by the cylinder formed by several detachable arc-shaped filter plates, and several stirring rods accelerate the filtering process.When impurities are deposited on the conical filter plate, several oblique scraping rods in rotation can further filter the impurities deposited at the bottom and crude oil through the conical filter plate again, and when impurities are deposited to a certain amount, impurities are discharged from the box body by helical blade.

Description

Technical Field

[0001] This invention relates to a filtration device, and more particularly to a primary filtration device for oil extraction and its usage method, belonging to the field of petroleum processing technology. Background Technology

[0002] Petroleum, also known as crude oil, is a brownish-black, flammable, viscous liquid extracted from deep underground. It has been an indispensable resource in the history of industrial development. Petroleum is composed of a mixture of different hydrocarbons. After processing, petroleum can be used in various industries. Petroleum extraction involves extracting crude oil from underground. Because petroleum is formed underground over millions of years, various impurities are also deposited underground along with it. During petroleum extraction, it generally undergoes simple primary filtration before further processing.

[0003] According to Chinese patent document CN217247370U, a high-efficiency filtration device for oil extraction includes a housing, a feed hopper at the top of the housing, a collection box on one side, a filter plate at the top of the housing, a guide plate at the bottom of the filter plate, a filter cylinder at the bottom of the guide plate, a stirring shaft inside the filter cylinder, a crossbar connected to the top of the stirring shaft, scrapers connected to both sides of the crossbar, and stirring blades at the bottom, a drive motor at the bottom of the filter cylinder, collection cylinders on both sides of the drive motor, a limiting post on the inner wall of the housing, a limiting plate connected to the limiting post, a support plate at the bottom of the limiting post, a vibration motor at the bottom of the support plate, a rotating shaft connected to the output end of the vibration motor, a cam connected to the rotating shaft, fixing posts on both sides of the bottom of the filter cylinder, and an oil drain pipe at the bottom of the housing.

[0004] Based on the search of the aforementioned patents and the findings of existing equipment, the aforementioned equipment, in its application, firstly, during the initial filtration, the residue filtered from the oil slides into the collection box through an inclined filter plate. Then, the filtered residue is guided into the collection cylinder through a collection pipe. However, when crude oil is extracted from the ground, it contains impurities of varying sizes, and crude oil is a relatively viscous liquid. In the aforementioned device, if the filtration speed of the filter plate is lower than the crude oil introduction speed, crude oil will be guided into the collection box along with the inclined filter plate. Secondly, the impurities filtered from the crude oil in the filter cylinder are stored in the collection cylinder. This means that as crude oil is continuously filtered, the impurities in the filter cylinder need to be constantly removed, which is time-consuming and labor-intensive. Furthermore, cleaning the collection box or collection cylinder when the device stops working will affect the efficiency of the oil filtration. Moreover, the time required to replace the collection box or collection cylinder will vary depending on the amount of impurities in the crude oil, easily leading to clogging of the entire filtration device and further affecting its filtration efficiency.

[0005] Therefore, it is urgent to improve the primary filtration device for oil extraction in order to solve the above-mentioned problems. Summary of the Invention

[0006] The purpose of this invention is to provide a primary filtration device for oil extraction and its usage method. This device continuously filters crude oil through a cylinder composed of several detachable arc-shaped filter plates. Several stirring rods accelerate the filtration process. When impurities deposit on the conical filter plates, several rotating oblique scrapers further filter the impurities and crude oil deposited at the bottom through the conical filter plates. When a certain amount of impurities accumulates, a servo motor is activated, and the impurities are discharged from the chamber via spiral blades. During this process, regardless of the amount of impurities from the crude oil, the continuously depositing impurities are continuously removed and discharged from the chamber during filtration. When the through holes on the first and second perforated circular plates are not connected, the discharge of impurities stops, preventing leakage of crude oil from the chamber. Several vertical and oblique scrapers ensure that the arc-shaped and conical filter plates do not become clogged during crude oil filtration. With impurities and filter plates readily accessible, the filtration efficiency of crude oil is greatly improved.

[0007] To achieve the above objectives, the main technical solution adopted by the present invention includes: a primary filtration device for oil extraction, comprising a tripod and a housing fixedly connected to the tripod, a housing cover bolted to the housing, a plurality of fixed short rods fixedly connected to the inner side wall of the housing, the plurality of fixed short rods being equidistantly arranged around the central axis of the housing, a plurality of filter plate fixing vertical rods fixedly connected to the ends of the plurality of fixed short rods away from the inner side wall of the housing, the plurality of filter plate fixing vertical rods being equidistantly arranged around the central axis of the housing, arc-shaped filter plates being respectively engaged between the plurality of filter plate fixing vertical rods, and a filter plate base fixedly connected to the ends of the plurality of filter plate fixing vertical rods away from the housing cover, the lower end face of the filter plate base being fixedly connected to... The filter is equipped with a conical filter plate. A slag discharge pipe is connected to the bottom wall of the housing. One end of the slag discharge pipe inside the housing is fixedly connected to the end of the conical filter plate near the bottom wall of the housing, and the slag discharge pipe is connected to the conical filter plate. A cross-shaped rotating shaft is fixedly connected to the inner side wall of the end of the conical filter plate near the bottom wall of the housing. A short rotating shaft is rotatably connected to the lower end face of the cross-shaped rotating shaft. A spiral blade is fixedly connected to the outer surface of the end of the short rotating shaft inside the slag discharge pipe. A first perforated circular plate is fixedly connected to the end of the conical filter plate near the slag discharge pipe. A second perforated circular plate is fixedly connected to the end of the short rotating shaft near the conical filter plate, and the upper surface of the second perforated circular plate is in contact with the lower surface of the first perforated circular plate.

[0008] Preferably, a motor base plate is fixedly connected to the bracket, and a gantry frame is fixedly connected to the motor base plate. The gantry frame is located directly below the slag discharge pipe, and the upper end face of the gantry frame is in contact with the outer surface of the slag discharge pipe. A servo motor is provided on the motor base plate, and the servo motor is located directly below the gantry frame. The rotating short shaft passes through the side wall of the slag discharge pipe and the top wall of the gantry frame, extends into the interior of the gantry frame, and is connected to the output end of the servo motor.

[0009] Preferably, a rotating long shaft is rotatably connected between the upper end face of the cross-shaped rotating shaft and the box cover. Several oblique scrapers are fixedly connected to the side wall of the rotating long shaft near the conical filter plate. The oblique scrapers are equidistantly arranged around the central axis of the box body, and one end face of the oblique scrapers is in contact with the inner side wall of the conical filter plate.

[0010] Preferably, a number of sets of stirring rods are fixedly connected at equal intervals on the rotating long shaft, each set of stirring rods consists of several rods, the several stirring rods are arranged at equal intervals around the central axis of the box, and the several sets of stirring rods are all located directly above the several inclined scrapers.

[0011] Preferably, several stirring blades are bolted to several stirring rods, and a vertical scraper is fixedly connected to one end of each stirring rod away from the long axis of rotation. The side of the vertical scraper away from the long axis of rotation is in contact with the inner wall of several arc-shaped filter plates.

[0012] Preferably, several baffles are fixed at equal intervals on the side of the filter plate fixing vertical rods near the rotation axis, and the side wall of the baffle away from the rotation axis is in contact with the side wall of the arc-shaped filter plate near the rotation axis.

[0013] Preferably, a fixing pressing plate is hinged to the upper end of the side wall of a plurality of filter plate fixing vertical rods away from the long axis of rotation. The lower end face of the fixing pressing plate is in contact with the upper end face of two of the arc-shaped filter plates that are engaged with the filter plate fixing vertical rods. The fixing pressing plate is connected to the upper end face of the filter plate fixing vertical rod by bolts.

[0014] Preferably, a vertical motor is provided on the upper surface of the box cover, and the end of the rotating long shaft away from the bottom wall of the box body passes through the box cover and is connected to the output end of the vertical motor.

[0015] Preferably, the outer wall of the box is connected to an inlet pipe by bolts, one end of the inlet pipe is connected to the inside of the box, and the end of the inlet pipe inside the box is located above the conical filter plate. The bottom of the box is connected to an outlet pipe, and the outlet pipe is fixedly connected to the lower end face of the stand.

[0016] A method for using a primary filtration device for oil extraction includes the following steps:

[0017] S1: First, crude oil collected from underground is introduced into a cylinder composed of several arc-shaped filter plates through an inlet pipe. Under the action of several arc-shaped filter plates, the crude oil is initially filtered. Then, the vertical motor is started, which drives the rotating long shaft to rotate. The rotating long shaft then drives several stirring rods and several inclined scrapers to rotate, thereby accelerating the filtration of crude oil in several arc-shaped filter plates.

[0018] S2: Then, after the crude oil is continuously filtered, the remaining residue after filtration is collected on the conical filter plate. Then, the servo motor is started, and the short shaft is rotated to drive the second perforated circular plate to rotate. When the through hole on the second perforated circular plate rotates to connect with the first perforated circular plate, the impurities accumulated on the conical filter plate will fall onto the spiral blades through the connecting through hole.

[0019] S3: Finally, the crude oil that has passed through several arc-shaped filter plates enters the space between the box and the several arc-shaped filter plates, and then collects at the bottom of the box. Then, the crude oil after primary filtration is discharged from the box through the discharge pipe. Meanwhile, the impurities are continuously driven out of the box through the slag discharge pipe by the spiral blades driven by the rotating short shaft and the rotating long shaft driven by several oblique scrapers.

[0020] This invention has at least the following beneficial effects:

[0021] 1. The filter continuously filters crude oil through a cylinder composed of several detachable arc-shaped filter plates, while several stirring rods accelerate the filtration process. When impurities settle on the conical filter plates, several rotating oblique scrapers further filter the impurities and crude oil deposited at the bottom through the conical filter plates again. When a certain amount of impurities has accumulated, the servo motor is activated, and the impurities are sent out of the chamber through the spiral blades. During this process, regardless of the amount of impurities from the crude oil, the continuously depositing impurities can be continuously removed and sent out of the chamber while filtering the crude oil. When the through holes on the first and second perforated circular plates are not connected, the discharge of impurities will stop, preventing the leakage of crude oil from the chamber. Several vertical scrapers and several oblique scrapers ensure that the arc-shaped and conical filter plates will not become clogged during crude oil filtration. With impurities and filter plates that can be removed at any time, the filtration efficiency of crude oil is greatly improved. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0023] Figure 1 This is a three-dimensional structural schematic diagram provided by the present invention;

[0024] Figure 2 This is a schematic diagram of the equiaxed side cross-sectional structure provided by the present invention;

[0025] Figure 3 This is a partial structural schematic diagram provided by the present invention;

[0026] Figure 4 A schematic diagram of the No. 1 and No. 2 perforated circular plates provided by the present invention;

[0027] Figure 5 Provided by the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0028] Figure 6 Provided by the present invention Figure 2 Enlarged structural diagram at point B.

[0029] In the diagram: 1. Box body; 2. Legs; 3. Box cover; 4. Fixed short rod; 5. Filter plate fixing vertical rod; 6. Arc-shaped filter plate; 7. Filter plate base; 8. Conical filter plate; 9. Slag discharge pipe; 10. Cross shaft bracket; 11. Rotating short shaft; 12. Spiral blade; 13. No. 1 perforated circular plate; 14. No. 2 perforated circular plate; 15. Motor base plate; 16. Gantry frame; 17. Servo motor; 18. Rotating long shaft; 19. Angled scraper; 20. Stirring rod; 21. Stirring blade; 22. Vertical scraper; 23. Baffle; 24. Fixed pressing plate; 25. Vertical motor; 26. Inlet pipe; 27. Outlet pipe. Detailed Implementation

[0030] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0031] like Figures 1-6As shown, the primary filtration device for oil extraction provided in this embodiment includes a stand 2 and a housing 1 fixedly connected to the stand 2. A housing cover 3 is bolted to the housing 1. Several short fixing rods 4 are fixedly connected to the inner wall of the housing 1. The short fixing rods 4 are equidistantly arranged around the central axis of the housing 1. Several filter plate fixing vertical rods 5 are fixedly connected to the ends of the short fixing rods 4 away from the inner wall of the housing 1. The filter plate fixing vertical rods 5 are equidistantly arranged around the central axis of the housing 1. Arc-shaped filter plates 6 are respectively clamped between the filter plate fixing vertical rods 5. A rotating long shaft 18 is rotatably connected between the upper end face of the cross-shaped rotating shaft frame 10 and the housing cover 3. Several sets of stirring rods 20 are fixedly connected at equal intervals on the rotating long shaft 18. Each set of stirring rods 20 consists of several rods. The stirring rods 20 are equidistantly arranged around the central axis of the housing 1. The stirring rods 20 are evenly positioned... Above several inclined scraper rods 19, several stirring rods 20 are respectively bolted with several stirring blades 21. The ends of several stirring rods 20 away from the rotating long axis 18 are respectively fixedly connected with vertical scraper rods 22. The side of the vertical scraper rods 22 away from the rotating long axis 18 contacts the inner wall of several arc-shaped filter plates 6. A vertical motor 25 is provided on the upper end of the box cover 3. The end of the rotating long axis 18 away from the bottom wall of the box body 1 passes through the box cover 3 and is connected to the output end of the vertical motor 25. Under the action of the vertical motor 25 driving the rotating long axis 18, the several stirring rods 20 accelerate the filtration of crude oil and also drive several vertical scraper rods 22 to scrape and clean the inner wall of several arc-shaped filter plates 6. According to different needs, the pushing force of crude oil can be changed by changing the length of several stirring blades 21.

[0032] Furthermore, such as Figures 1-6As shown, several filter plate fixing rods 5 are fixedly connected to filter plate bases 7 at their ends away from the box cover 3. Conical filter plates 8 are fixedly connected to the lower end face of the filter plate bases 7. A slag discharge pipe 9 is connected to the bottom wall of the box body 1. One end of the slag discharge pipe 9 inside the box body 1 is fixedly connected to the end of the conical filter plate 8 near the inner bottom wall of the box body 1, and the slag discharge pipe 9 is connected to the conical filter plate 8. A cross-shaped rotating shaft bracket 10 is fixedly connected to the inner side wall of the end of the conical filter plate 8 near the inner bottom wall of the box body 1. A rotating shaft bracket 10 is rotatably connected to the lower end face of the cross-shaped rotating shaft bracket 10. A short shaft 11 and a rotating long shaft 18 are fixedly connected to a number of oblique scraper rods 19 on the side wall near the conical filter plate 8. These oblique scraper rods 19 are equidistantly arranged around the central axis of the housing 1, with one end face of each rod contacting the inner side wall of the conical filter plate 8. A spiral blade 12 is fixedly connected to the outer surface of one end of the short shaft 11 located inside the slag discharge pipe 9. A perforated circular plate 13 is fixedly connected to one end of the conical filter plate 8 near the slag discharge pipe 9. A second perforated circular plate 14 is fixedly connected, with its upper surface contacting the lower surface of a first perforated circular plate 13. A motor base plate 15 is fixedly connected to the bracket 2, and a gantry frame 16 is fixedly connected to the motor base plate 15. The gantry frame 16 is located directly below the slag discharge pipe 9, with its upper surface contacting the outer surface of the slag discharge pipe 9. A servo motor 17 is mounted on the motor base plate 15, located directly below the gantry frame 16. A short rotating shaft 11 passes through the side wall of the slag discharge pipe 9 and... The top wall of the gantry 16 extends into the interior of the gantry 16 and is connected to the output end of the servo motor 17. The vertical motor 25 is started, which drives the rotating long shaft 18 to rotate. The rotating long shaft 18 then drives several stirring rods 20 and several inclined scrapers 19 to rotate, thereby accelerating the filtration of crude oil in several arc-shaped filter plates 6. When impurities are deposited on the conical filter plate 8, the rotating several inclined scrapers 19 will further filter the impurities deposited at the bottom and the crude oil again through the conical filter plate 8.

[0033] Furthermore, such as Figures 1-6As shown, several filter plate fixing vertical rods 5 are equidistantly fixed with several baffles 23 on the side near the rotating long axis 18. The baffles 23 and the filter plate fixing vertical rods 5 form a partition to fix several arc-shaped filter plates 6. The side wall of the baffle 23 away from the rotating long axis 18 is in contact with the side wall of the arc-shaped filter plate 6 near the rotating long axis 18. The upper end of the side wall of the filter plate fixing vertical rods 5 away from the rotating long axis 18 is respectively hinged with a fixing pressing plate 24. Two of the fixing pressing plates 24 are engaged with the filter plate fixing vertical rods 5 at their lower ends. The upper surfaces of the arc-shaped filter plates 6 are in contact with each other. The fixed pressing plate 24 is connected to the upper surface of the filter plate fixing vertical rod 5 by bolts. The outer wall of the box body 1 is connected to the inlet pipe 26 by bolts. One end of the inlet pipe 26 is connected to the inside of the box body 1, and the end of the inlet pipe 26 inside the box body 1 is located above the conical filter plate 8. The bottom of the box body 1 is connected to the outlet pipe 27, and the outlet pipe 27 is fixedly connected to the lower surface of the stand 2. When it is necessary to replace the arc-shaped filter plate 6, loosen the bolts that fix the pressing plate 24, and then pull out the arc-shaped filter plate 6 from between several filter plate fixing vertical rods 5.

[0034] like Figures 1-6 As shown in the figure, the method of using a primary filtration device for oil extraction provided in this embodiment includes the following steps:

[0035] S1: First, crude oil collected from underground is introduced into a cylinder composed of several arc-shaped filter plates 6 through the inlet pipe 26. Under the action of several arc-shaped filter plates 6, the crude oil is initially filtered. Then, the vertical motor 25 is started, which drives the rotating long shaft 18 to rotate. The rotating long shaft 18 then drives several stirring rods 20 and several inclined scraper rods 19 to rotate, thereby accelerating the filtration of crude oil in several arc-shaped filter plates 6.

[0036] S2: Then, after the crude oil is continuously filtered, the remaining residue after filtration is collected on the conical filter plate 8. Then, the servo motor 17 is started, and the short shaft 11 is rotated to drive the second perforated circular plate 14 to rotate. When the through hole on the second perforated circular plate 14 rotates to communicate with the first perforated circular plate 13, the impurities accumulated on the conical filter plate 8 will fall onto the spiral blade 12 through the communicating through hole.

[0037] S3: Finally, the crude oil passing through several arc-shaped filter plates 6 enters the space between the housing 1 and several arc-shaped filter plates 6, and then collects at the bottom of the housing 1. Then, the crude oil after primary filtration is discharged from the housing 1 through the discharge pipe 27. Meanwhile, the impurities are continuously driven out of the housing 1 by the spiral blades 12 through the slag discharge pipe 9 under the action of the rotating short shaft 11 and the rotating long shaft 18 driving several inclined scrapers 19 to push the deposited impurities.

[0038] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0039] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes that element.

[0040] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A primary filtration device for oil extraction, comprising a tripod (2) and a housing (1) fixedly connected to the tripod (2), characterized in that: A box cover (3) is bolted to the box body (1). Several fixed short rods (4) are fixedly connected to the inner wall of the box body (1). The several fixed short rods (4) are equidistantly arranged around the central axis of the box body (1). Several filter plate fixing vertical rods (5) are fixedly connected to the ends of the several fixed short rods (4) away from the inner wall of the box body (1). The several filter plate fixing vertical rods (5) are equidistantly arranged around the central axis of the box body (1). Arc-shaped filter plates (6) are respectively snapped between the several filter plate fixing vertical rods (5). A filter plate base (7) is fixedly connected to the ends of the several filter plate fixing vertical rods (5) away from the box cover (3). A conical filter plate (8) is fixedly connected to the lower end face of the filter plate base (7). A slag discharge pipe (9) is connected to the bottom wall of the box body (1). The slag discharge pipe (9) is located in the box body (1). One end of the conical filter plate (8) is fixedly connected to the end of the conical filter plate (8) near the bottom wall of the box (1), and the slag discharge pipe (9) is connected to the conical filter plate (8). A cross-shaped rotating shaft frame (10) is fixedly connected to the inner side wall of the end of the conical filter plate (8) near the bottom wall of the box (1). A rotating short shaft (11) is rotatably connected to the lower end face of the cross-shaped rotating shaft frame (10). A spiral blade (12) is fixedly connected to the outer surface of one end of the rotating short shaft (11) located inside the slag discharge pipe (9). A first perforated circular plate (13) is fixedly connected to the end of the conical filter plate (8) near the slag discharge pipe (9). A second perforated circular plate (14) is fixedly connected to the end of the rotating short shaft (11) near the conical filter plate (8), and the upper end face of the second perforated circular plate (14) is in contact with the lower end face of the first perforated circular plate (13).

2. The primary filtration device for oil extraction according to claim 1, characterized in that: A motor base plate (15) is fixedly connected to the bracket (2), and a gantry frame (16) is fixedly connected to the motor base plate (15). The gantry frame (16) is located directly below the slag discharge pipe (9), and the upper end face of the gantry frame (16) is in contact with the outer surface of the slag discharge pipe (9). A servo motor (17) is provided on the motor base plate (15), and the servo motor (17) is located directly below the gantry frame (16). The rotating short shaft (11) passes through the side wall of the slag discharge pipe (9) and the top wall of the gantry frame (16), extends into the gantry frame (16), and is connected to the output end of the servo motor (17).

3. The primary filtration device for oil extraction according to claim 2, characterized in that: A rotating shaft (18) is rotatably connected between the upper end face of the cross-shaped rotating shaft frame (10) and the box cover (3). Several oblique scrapers (19) are fixedly connected to the side wall of the rotating shaft (18) near the conical filter plate (8). The oblique scrapers (19) are equidistantly arranged around the central axis of the box body (1), and one end face of the oblique scrapers (19) is in contact with the inner side wall of the conical filter plate (8).

4. The primary filtration device for oil extraction according to claim 3, characterized in that: Several sets of stirring rods (20) are fixedly connected at equal intervals on the rotating long shaft (18). Each set of stirring rods (20) consists of several rods. The several stirring rods (20) are arranged at equal intervals around the central axis of the box body (1). The several sets of stirring rods (20) are all located directly above the several inclined scrapers (19).

5. The primary filtration device for oil extraction according to claim 4, characterized in that: Several stirring blades (21) are connected to several stirring rods (20) by bolts. A vertical scraper (22) is fixedly connected to one end of each stirring rod (20) away from the long axis of rotation (18). The side of the vertical scraper (22) away from the long axis of rotation (18) is in contact with the inner wall of several arc-shaped filter plates (6).

6. The primary filtration device for oil extraction according to claim 5, characterized in that: Several filter plate fixing rods (5) are fixed with several baffles (23) at equal intervals on the side of the filter plate fixing rods (5) near the rotating long axis (18), and the side wall of the baffle (23) away from the rotating long axis (18) is in contact with the side wall of the arc-shaped filter plate (6) near the rotating long axis (18).

7. The primary filtration device for oil extraction according to claim 6, characterized in that: Several filter plate fixing rods (5) are hinged to the upper end of the side wall away from the long axis of rotation (18) with fixing pressing plates (24). The lower end face of the fixing pressing plate (24) is in contact with the upper end face of two of the arc-shaped filter plates (6) that are engaged with the filter plate fixing rods (5). The fixing pressing plate (24) is connected to the upper end face of the filter plate fixing rods (5) by bolts.

8. The primary filtration device for oil extraction according to claim 7, characterized in that: A vertical motor (25) is provided on the upper surface of the box cover (3). The end of the rotating long shaft (18) away from the bottom wall of the box body (1) passes through the box cover (3) and is connected to the output end of the vertical motor (25).

9. A primary filtration device for oil extraction according to claim 8, characterized in that: The outer wall of the box (1) is connected to an inlet pipe (26) by bolts. One end of the inlet pipe (26) is connected to the inside of the box (1), and the end of the inlet pipe (26) inside the box (1) is located above the conical filter plate (8). The bottom of the box (1) is connected to an outlet pipe (27), and the outlet pipe (27) is fixedly connected to the lower end face of the stand (2).

10. A method of using the primary filtration device for oil extraction as described in claim 9, characterized in that: Includes the following steps: S1: First, crude oil collected from underground is introduced into a cylinder composed of several arc-shaped filter plates (6) through the inlet pipe (26), and the crude oil is initially filtered under the action of several arc-shaped filter plates (6). Then, the vertical motor (25) is started, which drives the rotating long shaft (18) to rotate. The rotating long shaft (18) then drives several stirring rods (20) and several inclined scrapers (19) to rotate, thereby accelerating the filtration of crude oil in several arc-shaped filter plates (6). S2: Then, after the crude oil is continuously filtered, the remaining residue after filtration is collected on the conical filter plate (8). Then, the servo motor (17) is started, and the short shaft (11) is rotated to drive the second perforated circular plate (14) to rotate. When the through hole on the second perforated circular plate (14) rotates to communicate with the first perforated circular plate (13), the impurities accumulated on the conical filter plate (8) will fall onto the spiral blade (12) through the communicating through hole. S3: Finally, the crude oil that passes through several arc-shaped filter plates (6) enters the space between the box (1) and several arc-shaped filter plates (6) and then gathers at the bottom of the box (1). Then, the crude oil after primary filtration is discharged from the box (1) through the discharge pipe (27). The impurities are driven by the rotating short shaft (11) and driven by the rotating long shaft (18) to push the deposited impurities through several oblique scrapers (19). The spiral blades (12) will continuously drive the impurities through the slag discharge pipe (9) and send them out of the box (1).

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