A multi-stage circulation cavitation demulsification device and control method thereof

Abstract

The present invention relates to the technical field of demulsification devices, and in particular to a multi-stage circulating cavitation demulsification device and a control method thereof. The present invention comprises a base frame, a demulsification tank is fixedly connected to the base frame, a feed port is fixedly connected to the top of the demulsification tank, a discharge port is fixedly connected to the bottom of the demulsification tank, and further comprises: a control unit, which is arranged on the side wall of the base frame; a negative suction pipe, which is arranged inside the demulsification tank; the present invention starts to extract the oil layer through the negative suction pipe by setting a liquid suction adjustment component, and as the oil layer is extracted, the liquid level of the oil layer gradually decreases. During this process, the negative suction component drives the negative suction pipe to move downward synchronously, so that the distance by which the negative suction pipe extends into the oil layer is always maintained at a predetermined condition, and the power of the negative suction component is maintained constant during the extraction process, which helps to avoid frequent adjustment of the power of the negative suction component, thereby causing power loss.

Description

Technical Field

[0001] The invention relates to the field of demulsification devices, and in particular to a multi-stage circulation cavitation demulsification device and a control method thereof. Background Art

[0002] Demulsification refers to the process of destroying the stable state between the oil and water phases in the emulsion, so that one phase that was originally evenly dispersed is separated from the other phase. Emulsions are usually composed of two immiscible liquids (such as oil and water), and usually contain surfactants or emulsifiers to stabilize the mixture. Demulsification can be achieved by a variety of methods, including physical methods, chemical methods or biological methods.

[0003] The prior art discloses some invention patents in the field of demulsification. The Chinese patent with application number 201210066424.9 discloses an automatic demulsification device, including a cylindrical demulsification device housing, characterized in that: a sewage inlet is provided at the bottom of the demulsification device housing, a treated water outlet is provided on the side wall of the demulsification device housing, the top of the demulsification device housing is sealed by a flange, and a plexiglass cover is installed on the top, and an air separator and an oil drain port are installed on the plexiglass cover; a first inner liner is installed inside the demulsification device housing, the bottom of the first inner liner is connected to the sewage inlet, and the outer side of the first inner liner is respectively covered with a second inner liner and a third inner liner, the tops of the first inner liner and the second inner liner are connected, and the bottoms of the second inner liner and the third inner liner are connected. A micro aeration head is provided at the bottom of the demulsification device housing.

[0004] When demulsifying sewage, physical methods are generally used for treatment. For example, a common method is to let it stand. Because the density of oil and water is different, they can be separated by simple gravity sedimentation. Oil is usually lighter than water, so it will float on the water surface. After standing, the oil layer on the top can be collected by tools such as skimmers or scrapers. However, in actual applications, during the collection of the top oil layer, during the liquid extraction process, due to the impact of the flow, the sediment at the bottom may be disturbed, causing part of the sediment to re-suspend and mix into the extracted clear liquid. This phenomenon will reduce the efficiency of separation of clear liquid from oil and water, and increase the difficulty and workload of subsequent purification treatment. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a multi-stage circulation cavitation demulsification device and a control method thereof.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a multi-stage circulating cavitation demulsification device, comprising a base frame, a demulsification tank is fixedly connected to the base frame, a feed inlet is fixedly connected to the top of the demulsification tank, a discharge port is fixedly connected to the bottom of the demulsification tank, and further comprising:

[0007] A control unit, wherein the control unit is arranged on a side wall of the base frame;

[0008] A negative suction pipe, the negative suction pipe is arranged inside the demulsification tank;

[0009] A negative suction component is disposed between the demulsification tank and the control unit, and the negative suction component is communicated with the end of the negative suction pipe;

[0010] A liquid suction adjustment component, when the negative suction pipe sucks the static stratified liquid, the liquid suction adjustment component is used to adjust the liquid entering the negative suction pipe in real time to prevent the disturbance of the clear liquid in the process of sucking the stratified liquid;

[0011] Among them, the present invention starts to extract the oil layer through the negative suction pipe through the setting of the liquid suction adjustment component. As the oil layer is extracted, the liquid level of the oil layer gradually decreases. During this process, the negative suction component drives the negative suction pipe to move downward synchronously, so that the distance that the negative suction pipe extends into the oil layer is always maintained at a predetermined situation, and the power of the negative suction component is maintained constant during the extraction process, which helps to avoid frequent adjustment of the power of the negative suction component and thus power loss. At the same time, the liquid suction adjustment component will also move downward synchronously with the negative suction pipe, and as the depth of the oil layer decreases, the liquid inlet speed of the negative suction pipe is adjusted, so that the liquid inlet speed gradually decreases with the decrease in the depth of the oil layer, thereby helping to prevent the clear liquid at the bottom from being disturbed and mixed with the oil layer during the process of extracting the oil layer.

[0012] Preferably: the liquid suction adjustment assembly includes a connecting plate, the connecting plate is fixedly connected to the outer wall of the negative suction pipe, the bottom of the connecting plate is fixedly connected to an electric push rod, the telescopic end of the electric push rod is fixedly connected to a U-shaped card plate, the side wall of the U-shaped card plate is fixedly connected to a tooth plate, the internal rotation of the negative suction pipe is connected to a rotating rod, the outer wall of the rotating rod is fixedly connected to an adjusting circular plate, the adjusting circular plate is located inside the negative suction pipe, one end of the rotating rod is fixedly connected to a limiting plate, the limiting plate and the outer wall of the negative suction pipe are fixedly connected with a spring, the other end of the rotating rod is fixedly connected to a gear, the gear is located between the two side walls of the U-shaped card plate and meshes with the tooth plate.

[0013] Preferably, the diameter of the adjusting circular plate is equal to the inner wall diameter of the negative suction pipe.

[0014] Preferably, two groups of guide grooves are provided on the surface of the adjusting circular plate, the two groups of guide grooves are symmetrically arranged, and a shielding plate is slidably connected to the adjusting circular plate, and the shielding plate is used to shield one of the guide grooves.

[0015] Preferably: the end of the negative suction pipe is curved, and the end of the negative suction pipe is rotatably connected to the filter screen;

[0016] Among them, by setting the end of the negative suction pipe to be bent, specifically, one end of the negative suction pipe can be bent into a small angle such as a degree angle, so that the negative suction pipe can extend horizontally after entering the container, close to the surface of the oil layer, and the bending position is at the end of the negative suction pipe, that is, the part entering the container. The length of the bent part is set according to actual needs, specifically a few centimeters. Through such a design, it can be ensured that when the oil layer is extracted, the tip of the negative suction pipe is always close to the surface of the oil layer, and will not touch the clear liquid layer at the bottom of the container, thereby reducing the disturbance of the clear liquid at the bottom.

[0017] Preferably: a circular shielding plate is rotatably connected to one side of the filter screen, a groove is provided on one side of the circular shielding plate, rectangular grooves are provided in a circular array inside the groove, a support rod is fixedly connected to the outer wall of the circular shielding plate, and the support rod is fixedly connected to the inner wall of the negative suction pipe;

[0018] A motor is fixedly connected to one side of the circular shielding plate away from the filter screen, an outer wall of an output shaft of the motor is fixedly connected to the filter screen, a sliding rod is rotatably connected to the telescopic end of the motor, and a cleaning rod is fixedly connected to the end of the sliding rod.

[0019] Preferably: the negative suction assembly comprises a fixed block, the top of the fixed block is fixedly connected to a suction machine, the liquid inlet of the suction machine is fixedly connected to a hose, and the hose is fixedly connected to the negative suction pipe;

[0020] The outer wall of the negative suction pipe is fixedly connected with a collar, the outer wall of the collar is fixedly connected with an electric push rod, and the electric push rod is fixedly connected with a fixed block.

[0021] In a second aspect, the present invention provides a control method for a multi-stage circulation cavitation demulsification device, the control method comprising the following steps:

[0022] Acquire first parameter information, wherein the first parameter information at least includes electric push rod start-up and retraction information;

[0023] generating first control information according to the first parameter information;

[0024] The first control information is sent to the electric push rod to control the electric push rod to start pushing out.

[0025] Preferably: a flow monitoring unit is also included, wherein the control method further includes the following steps:

[0026] Acquire second parameter information, wherein the second parameter information at least includes that the liquid inlet flow rate at the end of the negative suction pipe is less than a threshold value obtained by the flow monitoring unit;

[0027] generating second control information according to the second parameter information;

[0028] The second control information is sent to the motor to control the motor to start working.

[0029] Preferably: the flow monitoring unit is specifically a flow detection sensor.

[0030] Among them, the flow detection sensor is installed inside the negative suction pipe and is installed according to actual needs.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention starts to extract the oil layer through the negative suction pipe by setting a liquid suction adjustment component. As the oil layer is extracted, the liquid level of the oil layer gradually decreases. During this process, the negative suction component drives the negative suction pipe to move downward synchronously, so that the distance that the negative suction pipe extends into the oil layer is always maintained at a predetermined level, and the power of the negative suction component is maintained constant during the extraction process, which helps to avoid frequent adjustments to the power of the negative suction component and thus power loss. At the same time, the liquid suction adjustment component also moves downward synchronously with the negative suction pipe, and as the depth of the oil layer decreases, the liquid inlet speed of the negative suction pipe is adjusted, so that the liquid inlet speed gradually decreases as the depth of the oil layer decreases, thereby helping to prevent the clear liquid at the bottom from being disturbed and mixed with the oil layer during the extraction of the oil layer.

[0033] 2. The present invention sets a guide groove. During the rotation of the adjusting circular plate, in order to prevent the adjusting circular plate from being blocked so that the oil layer is difficult to flow through, the guide groove is opened on the adjusting circular plate to ensure that the two sides of the adjusting circular plate are always flowing. At this time, no matter how the adjusting circular plate rotates or is blocked, the negative suction pipe can still extract the oil.

[0034] 3. The present invention provides a cleaning rod, which, on the one hand, utilizes the rotation of the filter to help prevent impurities from accumulating on the filter, and on the other hand, uses the cleaning rod to clean stubborn impurities on the filter that are difficult to clean by the rotation of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a flow chart of the control method of the present invention.

[0036] Figure 2 It is a schematic diagram of the overall structure of the demulsification device of the present invention.

[0037] Figure 3 It is a schematic structural diagram of the present invention along the cross section of the demulsification tank.

[0038] Figure 4 It is a schematic structural diagram of the negative suction pipe and the connection part of the negative suction pipe of the present invention.

[0039] Figure 5 For the present invention Figure 4An enlarged schematic diagram of the structure of section A is shown.

[0040] Figure 6 For the present invention Figure 4 An enlarged schematic diagram of the structure of part B is shown.

[0041] Figure 7 The structure of the present invention after the negative straw section is shown in FIG. Figure 1 .

[0042] Figure 8 For the present invention Figure 7 An enlarged schematic diagram of the C-section structure is shown.

[0043] Fig. 9 The structure of the present invention after the negative straw section is shown in FIG. Figure 2 .

[0044] Fig.10 For the present invention Fig. 9 An enlarged schematic diagram of the D structure is shown.

[0045] Fig.11 It is a schematic structural diagram of the circular shielding plate of the present invention.

[0046] In the figure: 1. base frame; 2. demulsification tank; 201. feed port; 202. discharge port; 3. control unit; 4. negative suction pipe; 5. connecting plate; 6. electric push rod; 7. U-shaped clamping plate; 8. tooth plate; 9. rotating rod; 10. adjusting circular plate; 11. limit plate; 12. spring; 13. gear; 14. guide groove; 15. baffle plate; 16. filter screen; 17. groove; 18. rectangular groove; 19. support rod; 20. motor; 21. slide rod; 22. cleaning rod; 23. fixing block; 24. suction machine; 25. hose; 26. collar; 27. electric push rod; 28. circular baffle plate. DETAILED DESCRIPTION

[0047] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0048] Application scenario: When demulsifying sewage, physical methods are generally used for treatment. For example, a common method is to let it stand. Because the density of oil and water is different, they can be separated by simple gravity sedimentation. Oil is usually lighter than water, so it will float on the water surface. After standing, the oil layer on the top can be collected by tools such as skimmers or scrapers. However, in actual applications, during the collection of the top oil layer, during the liquid extraction process, due to the impact of the flow, the sediment at the bottom may be disturbed, causing part of the sediment to re-suspend and mix into the extracted clear liquid. This phenomenon will reduce the efficiency of separation of clear liquid from oil and water, and increase the difficulty and workload of subsequent purification treatment.

[0049] like Figures 2 to 11 The multi-stage circulating cavitation demulsification device shown comprises a base frame 1, a demulsification tank 2 is fixedly connected to the base frame 1, a feed inlet 201 is fixedly connected to the top of the demulsification tank 2, and a discharge port 202 is fixedly connected to the bottom of the demulsification tank 2, and further comprises:

[0050] A control unit 3, which is arranged on a side wall of the base frame 1;

[0051] A negative suction pipe 4, which is arranged inside the demulsification tank 2;

[0052] A negative suction component is disposed between the emulsion breaking tank 2 and the control unit 3, and the negative suction component is connected to the end of the negative suction pipe 4;

[0053] The liquid suction adjustment component is used to adjust the liquid entering the negative suction pipe 4 in real time when the negative suction pipe 4 sucks the static stratified liquid to prevent the clear liquid from being disturbed during the process of sucking the stratified liquid;

[0054] In the specific implementation, during the operation, the target object is placed inside the demulsification tank 2 and allowed to stand. After standing for a certain period of time, the clear liquid and oil liquid with obvious stratification are obtained, and then the negative suction pipe 4 is extended into the oil liquid to ensure that it can penetrate into the oil layer without touching the bottom. Then, the control unit 3 controls the negative suction component to start working, and then the oil layer is extracted through the negative suction pipe 4. As the oil layer is extracted, the liquid level of the oil layer gradually decreases. During this process, the negative suction component drives the negative suction pipe 4 to move downward synchronously, so that the distance of the negative suction pipe 4 extending into the oil layer is always maintained at a predetermined level, and the power of the negative suction component is maintained constant during the extraction process, which helps to avoid frequent adjustment of the power of the negative suction component, thereby causing power loss.

[0055] At the same time, the liquid suction adjustment component will also move downward synchronously with the negative suction pipe 4, and as the depth of the oil layer decreases, the liquid inlet speed of the negative suction pipe 4 will be adjusted, so that the liquid inlet speed gradually decreases as the depth of the oil layer decreases, thereby helping to prevent the clear liquid at the bottom from being disturbed and mixed with the oil layer during the process of extracting the oil layer.

[0056] It should be noted that the control unit 3 is specifically a controller.

[0057] As a technical optimization scheme of the present invention: the liquid suction adjustment component includes a connecting plate 5, the connecting plate 5 is fixedly connected to the outer wall of the negative suction pipe 4, the bottom of the connecting plate 5 is fixedly connected to an electric push rod 6, the telescopic end of the electric push rod 6 is fixedly connected to a U-shaped card plate 7, the side wall of the U-shaped card plate 7 is fixedly connected to a tooth plate 8, the internal rotation of the negative suction pipe 4 is connected to a rotating rod 9, the outer wall of the rotating rod 9 is fixedly connected to an adjusting circular plate 10, the adjusting circular plate 10 is located inside the negative suction pipe 4, one end of the rotating rod 9 is fixedly connected to a limiting disk 11, the limiting disk 11 and the outer wall of the negative suction pipe 4 are fixedly connected with a spring 12, the other end of the rotating rod 9 is fixedly connected to a gear 13, the gear 13 is located between the two side walls of the U-shaped card plate 7, and meshes with the tooth plate 8;

[0058] In the specific implementation, the control unit 3 controls the electric push rod 6 to start pushing out, the electric push rod 6 pushes the U-shaped card plate 7 to move, the U-shaped card plate 7 drives the tooth plate 8 to move downward, and the tooth plate 8 drives the gear 13 to rotate after contacting with the gear 13, and the gear 13 drives the rotating rod 9 to rotate, and the rotating rod 9 drives the adjusting circular plate 10 to rotate, so that the adjusting circular plate 10 gradually blocks the inside of the negative suction pipe 4. As the adjusting circular plate 10 rotates, the amount of oil passing through is reduced by the blocking of the adjusting circular plate 10, which helps to reduce the adsorption speed after the oil layer is gradually extracted, so that the extraction speed is slowed down after contacting the bottom of the oil layer to prevent the clear liquid from being disturbed.

[0059] As a technical optimization solution of the present invention: the diameter of the circular plate 10 is adjusted to be equal to the inner wall diameter of the negative suction pipe 4;

[0060] In a specific implementation, by setting the diameter of the adjusting circular plate 10 to be equal to the diameter of the negative suction pipe 4 , the inner wall of the negative suction pipe 4 is gradually shielded during the process of rotating shielding.

[0061] As a technical optimization solution of the present invention: two groups of guide grooves 14 are opened on the surface of the adjusting circular plate 10, and the two groups of guide grooves 14 are symmetrically arranged. A shielding plate 15 is slidably connected to the adjusting circular plate 10, and the shielding plate 15 is used to shield one of the guide grooves 14;

[0062] In a specific implementation, during the rotation of the adjusting circular plate 10, in order to prevent the adjusting circular plate 10 from making it difficult for the oil layer to flow through when it is blocked, a guide groove 14 is opened on the adjusting circular plate 10 to ensure that both sides of the adjusting circular plate 10 are always flowing. At this time, no matter how the adjusting circular plate 10 is rotated or blocked, the negative suction pipe 4 can still extract the oil.

[0063] As a technical optimization solution of the present invention: the end of the negative suction pipe 4 is bent, and the end of the negative suction pipe 4 is rotatably connected to the filter screen 16;

[0064] In a specific implementation, the end of the negative suction pipe 4 is set to be bent, specifically, one end of the negative suction pipe 4 can be bent into a small angle (for example, 45 degrees), so that after entering the container, the negative suction pipe 4 can extend horizontally, close to the surface of the oil layer, and the bending position is at the end of the negative suction pipe 4, that is, the part entering the container. The length of the bent part is set according to actual needs, specifically a few centimeters. Through such a design, it can be ensured that when the oil layer is extracted, the tip of the negative suction pipe 4 is always close to the surface of the oil layer, and will not touch the clear liquid layer at the bottom of the container, thereby reducing the disturbance of the clear liquid at the bottom;

[0065] By providing the filter 16, impurities that are not suitable for passing through during the extraction process are filtered out, thereby helping to prevent the impurities from clogging the negative suction pipe 4 and causing difficulty in extracting oil.

[0066] As a technical optimization solution of the present invention: a circular shielding plate 28 is rotatably connected to one side of the filter screen 16, a groove 17 is provided on one side of the circular shielding plate 28, and rectangular grooves 18 are provided in a circular array inside the groove 17, and a support rod 19 is fixedly connected to the outer wall of the circular shielding plate 28, and the support rod 19 is fixedly connected to the inner wall of the negative suction pipe 4;

[0067] A motor 20 is fixedly connected to one side of the circular shielding plate 28 away from the filter screen 16. The outer wall of the output shaft of the motor 20 is fixedly connected to the filter screen 16. The telescopic end of the motor 20 is rotatably connected to a slide rod 21. The end of the slide rod 21 is fixedly connected to a cleaning rod 22.

[0068] In the specific implementation, in order to prevent the filter 16 from being blocked, the control unit 3 controls the motor 20 to start working, and the motor 20 drives the filter 16 to rotate. Because the connecting rod is rotatably connected to the telescopic end of the motor 20, the filter 16 will produce relative movement with the cleaning rod 22. On the one hand, the rotation of the filter 16 itself helps to prevent impurities from accumulating on the filter 16. On the other hand, the cleaning rod 22 is used to clean the stubborn impurities on the filter 16 that are difficult to clean by relying on the rotation of the filter 16 itself.

[0069] As a technical optimization solution of the present invention: the negative suction assembly includes a fixed block 23, the top of the fixed block 23 is fixedly connected to a suction machine 24, the liquid inlet of the suction machine 24 is fixedly connected to a hose 25, and the hose 25 is fixedly connected to the negative suction pipe 4;

[0070] The outer wall of the negative suction pipe 4 is fixedly connected with a collar 26, the outer wall of the collar 26 is fixedly connected with an electric push rod 27, and the electric push rod 27 is fixedly connected with the fixed block 23;

[0071] In a specific implementation, the electric push rod 27 is controlled to drive the collar 26 to move downward, and the collar 26 drives the negative suction pipe 4 to move downward, so that the negative suction pipe 4 and the oil layer are maintained at a predetermined position. In addition, because the negative suction pipe 4 is a hard pipe and is connected to the hose 25, the hose 25 can generate corresponding movement to adapt to the movement of the negative suction pipe 4 during the upward movement of the negative suction pipe 4.

[0072] And the suction machine 24 extracts the oil through the hose 25 and the negative suction pipe 4.

[0073] like Figure 1 A control method for a multi-stage circulation cavitation demulsification device is shown, and the control method comprises the following steps:

[0074] Acquire first parameter information, where the first parameter information at least includes information on starting and contracting the electric push rod 27;

[0075] generating first control information according to the first parameter information;

[0076] The first control information is sent to the electric push rod 6 to control the electric push rod 6 to start pushing out.

[0077] As a technical optimization solution of the present invention: it also includes a flow monitoring unit:

[0078] Acquire second parameter information, where the second parameter information at least includes that the liquid inlet flow rate at the end of the negative suction pipe 4 is less than a threshold value obtained by the flow monitoring unit;

[0079] generating second control information according to the second parameter information;

[0080] The second control information is sent to the motor 20 to control the motor 20 to start working.

[0081] As a technical optimization solution of the present invention: the flow monitoring unit is specifically a flow detection sensor.

[0082] Working principle of the present invention:

[0083] During the operation, the target object is placed inside the demulsification tank 2 and allowed to stand. After standing for a certain period of time, the clear liquid and oil liquid with obvious stratification are obtained. Then, the negative suction pipe 4 is extended into the oil liquid and ensured to penetrate into the oil layer without touching the bottom. Then, the control unit 3 is used to control the negative suction component to start working, and then the oil layer is extracted through the negative suction pipe 4. As the oil layer is extracted, the liquid level of the oil layer gradually decreases. During this process, the negative suction component drives the negative suction pipe 4 to move downward synchronously, so that the distance of the negative suction pipe 4 extending into the oil layer is always maintained at a predetermined level, and the power of the negative suction component is maintained constant during the extraction process, which helps to avoid frequent adjustment of the power of the negative suction component, thereby causing power loss.

[0084] At the same time, the liquid suction adjustment component will also move downward synchronously with the negative suction pipe 4, and as the depth of the oil layer decreases, the liquid inlet speed of the negative suction pipe 4 will be adjusted, so that the liquid inlet speed gradually decreases as the depth of the oil layer decreases, thereby helping to prevent the clear liquid at the bottom from being disturbed and mixed with the oil layer during the process of extracting the oil layer.

[0085] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A multi-stage circulation cavitation demulsification device, comprising a base frame (1), a demulsification tank (2) fixedly connected to the base frame (1), a feed inlet (201) fixedly connected to the top of the demulsification tank (2), and a discharge outlet (202) fixedly connected to the bottom of the demulsification tank (2), characterized in that: Also includes: A control unit (3), the control unit (3) being arranged on a side wall of the base frame (1); A negative suction pipe (4), the negative suction pipe (4) being arranged inside the demulsification tank (2); A negative suction component is arranged between the demulsification tank (2) and the control unit (3), and the negative suction component is connected to the end of the negative suction pipe (4); A liquid suction adjustment component, when the negative suction pipe (4) sucks the static stratified liquid, the liquid suction adjustment component is used to adjust the liquid entering the negative suction pipe (4) in real time to prevent the clear liquid from being disturbed during the process of sucking the stratified liquid; The liquid suction adjustment assembly comprises a connecting plate (5), the connecting plate (5) being fixedly connected to the outer wall of the negative suction pipe (4), the bottom of the connecting plate (5) being fixedly connected to an electric push rod (6), the telescopic end of the electric push rod (6) being fixedly connected to a U-shaped card plate (7), the side wall of the U-shaped card plate (7) being fixedly connected to a tooth plate (8), the interior of the negative suction pipe (4) being rotatably connected to a rotating rod (9), the outer wall of the rotating rod (9) being fixedly connected to an adjusting circular plate (10), the adjusting circular plate (10) being located inside the negative suction pipe (4), one end of the rotating rod (9) being fixedly connected to a limiting plate (11), the limiting plate (11) and the outer wall of the negative suction pipe (4) being fixedly connected to a spring (12), the other end of the rotating rod (9) being fixedly connected to a gear (13), the gear (13) being located between the two side walls of the U-shaped card plate (7) and meshing with the tooth plate (8).

2. A multi-stage circulation cavitation demulsification device according to claim 1, characterized in that: The diameter of the adjusting circular plate (10) is equal to the diameter of the inner wall of the negative suction pipe (4).

3. A multi-stage circulation cavitation demulsification device according to claim 1, characterized in that: Two groups of guide grooves (14) are provided on the surface of the adjusting circular plate (10), and the two groups of guide grooves (14) are symmetrically arranged. A shielding plate (15) is slidably connected to the adjusting circular plate (10), and the shielding plate (15) is used to shield one of the guide grooves (14).

4. The multi-stage circulation cavitation demulsification device according to claim 1, characterized in that: The end of the negative suction pipe (4) is bent, and the end of the negative suction pipe (4) is rotatably connected to the filter screen (16).

5. A multi-stage circulation cavitation demulsification device according to claim 4, characterized in that: A circular shielding plate (28) is rotatably connected to one side of the filter screen (16); a groove (17) is provided on one side of the circular shielding plate (28); rectangular grooves (18) are provided in a circular array inside the groove (17); a support rod (19) is fixedly connected to the outer wall of the circular shielding plate (28); and the support rod (19) is fixedly connected to the inner wall of the negative suction pipe (4); A motor (20) is fixedly connected to the side of the circular baffle plate (28) away from the filter screen (16); the outer wall of the output shaft of the motor (20) is fixedly connected to the filter screen (16); the telescopic end of the motor (20) is rotatably connected to a slide rod (21); and the end of the slide rod (21) is fixedly connected to a cleaning rod (22).

6. The multi-stage circulation cavitation demulsification device according to claim 1, characterized in that: The negative suction assembly comprises a fixed block (23), the top of the fixed block (23) is fixedly connected to a suction machine (24), the liquid inlet of the suction machine (24) is fixedly connected to a hose (25), and the hose (25) is fixedly connected to the negative suction pipe (4); A collar (26) is fixedly connected to the outer wall of the negative suction pipe (4), an electric push rod (27) is fixedly connected to the outer wall of the collar (26), and the electric push rod (27) is fixedly connected to the fixed block (23).

7. A control method for a multi-stage circulation cavitation demulsification device, applicable to a multi-stage circulation cavitation demulsification device as claimed in claim 6, characterized in that: The control method comprises the following steps: Acquiring first parameter information, the first parameter information at least including information on starting and contracting the electric push rod (27); generating first control information according to the first parameter information; The first control information is sent to the electric push rod (6) to control the electric push rod (6) to start pushing out.

8. The control method of a multi-stage circulation cavitation demulsification device according to claim 7, characterized in that: It also includes a flow monitoring unit, wherein the control method further includes the following steps: Acquiring second parameter information, the second parameter information at least including that the liquid inlet flow rate at the end of the negative suction pipe (4) obtained by a flow monitoring unit is less than a threshold value; generating second control information according to the second parameter information; The second control information is sent to the motor (20) to control the motor (20) to start working.

9. The control method of a multi-stage circulation cavitation demulsification device according to claim 8, characterized in that: The flow monitoring unit is specifically a flow detection sensor.

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