Multi-stage separation and extraction equipment for illegal cooking oil and use method of multi-stage separation and extraction equipment

Abstract

The invention discloses multi-stage separation and extraction equipment for illegal cooking oil and a use method thereof, and relates to the technical field of illegal cooking oil purification, the multi-stage separation and extraction equipment comprises a fixing frame mechanism, the fixing frame mechanism comprises a fixing frame, and a fixing plate is fixedly mounted in the fixing frame; the pretreatment mechanism comprises a filtering assembly, a self-cleaning assembly, a residue storage assembly and an extrusion assembly; particle residues in illegal cooking oil can be filtered and intercepted through the filtering assembly, the follow-up purification quality of the illegal cooking oil is improved, the filtering efficiency of the illegal cooking oil is improved through the extrusion assembly, the interior of the filtering assembly can be automatically cleaned through the self-cleaning assembly, and the particle residues in the illegal cooking oil are prevented from blocking the filtering assembly; shutdown for manual cleaning is not needed, and the purification efficiency is improved; a large number of microbubbles can be generated through the precipitation assembly and the air flotation assembly, and the microbubbles float upwards and are attached to oil drops to form a gas-oil complex and float upwards to the liquid level to form a floating oil layer, so that oil and water are rapidly separated.

Description

Technical Field

[0001] This invention relates to the field of waste cooking oil purification technology, specifically to a multi-stage separation and extraction device for waste cooking oil and its usage method. Background Technology

[0002] The catering industry generates a large amount of oily wastewater, which in turn leads to a large quantity of gutter oil. This gutter oil contains numerous impurities and requires purification before it can be used as raw material for biodiesel or oleochemical plants.

[0003] In the prior art, such as the "A Wastewater Oil Purification Device" with Chinese Patent No. CN220572886U, a filter drum is included. The top of the filter drum has an inlet, and a spiral roller is rotatably connected inside the filter drum. A drive motor is fixedly installed on the left side of the filter drum. A collection hopper is located at the bottom of the filter drum, and a housing is fixedly installed at the bottom of the collection hopper. A filter cloth is installed inside the housing, and a distillation chamber is fixedly installed at the bottom of the housing. A switch valve is located at the connection between the housing and the distillation chamber. A heating block is installed on the inner wall of the distillation chamber. A sedimentation cylinder is fixedly connected to the bottom of the distillation chamber, and an oil drain valve is located on the side of the sedimentation cylinder. A sludge drain valve is located at the bottom of the sedimentation cylinder. Its beneficial effect is that, during use, the wastewater oil sequentially passes through the spiral roller and filter drum to remove large impurities, then through the filter cloth to remove small impurities, and finally, after being heated in the distillation chamber, it further settles and clarifies in the sedimentation cylinder, thus improving the impurity removal effect and the purification effect of the wastewater oil.

[0004] However, in existing technologies, when filtering waste cooking oil, large particles of residue in the oil can easily clog the filter device, requiring the machine to be stopped for manual cleaning, which seriously affects the purification efficiency and increases labor costs. In addition, the waste cooking oil in the sedimentation tank relies on natural sedimentation, which takes a long time and cannot meet the needs of batch processing. Furthermore, the overall automation level of the device is low, and the connection between each link is not smooth enough, which further limits the processing efficiency. Summary of the Invention

[0005] To address the problems of easy clogging of filters, need for manual cleaning, long sedimentation time, and low automation in existing technologies, this invention provides a multi-stage separation and extraction device and method for waste cooking oil, which achieves automatic filter cleaning, accelerated sedimentation, and efficient separation and extraction, thereby improving the purification efficiency and automation level of waste cooking oil.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A multi-stage separation and extraction device for waste cooking oil includes: a fixed frame mechanism, comprising a fixed frame with a fixed plate fixedly installed inside the fixed frame; a pretreatment mechanism, comprising a filter assembly, a self-cleaning assembly, a slag storage assembly, and a pressing assembly; the filter assembly is installed on the top of the fixed frame for filtering and intercepting residues in the waste cooking oil; the self-cleaning assembly is installed inside the filter assembly for cleaning the interior of the filter assembly; the slag storage assembly is installed on the top inner wall of the fixed frame and communicates with the filter assembly for collecting and storing the residues cleaned by the self-cleaning assembly; the pressing assembly is installed inside the filter assembly for pressing and filtering the waste cooking oil inside the filter assembly; and a heating mechanism. The structure includes a heating component and a stirring component. The heating component is installed on top of a fixed frame and is connected to a filtering component. It is used to heat the filtered waste oil to reduce its viscosity. The stirring component is installed inside the heating component and is used to stir the heated waste oil. The purification mechanism includes a sedimentation component, a flotation component, and an oil suction component. The sedimentation component is installed on top of a fixed plate and is connected to the heating component. It is used to settle the heated waste oil. The flotation component is installed inside the sedimentation component and is used to release microbubbles that adhere to the oil droplets, causing them to float. The oil suction component is installed on top of the fixed plate and is connected to the sedimentation component. It is used to extract the separated pure oil and inject it into an externally installed oil storage tank.

[0007] Furthermore, the filtration assembly includes a filter cylinder and a filter screen mechanism. The filter cylinder is located at the top of the fixed frame, and the filter screen mechanism is located inside the filter cylinder. The filter screen mechanism includes a left support and a right support arranged sequentially from left to right inside the filter cylinder. A segmentation mesh is arranged on the right side of the left support, and a pre-filter clamping mesh, a micron filter, and a post-filter clamping mesh are arranged sequentially from left to right on the left side of the right support. The micron filter is clamped by the pre-filter clamping mesh and the post-filter clamping mesh. A feed pipe is fixedly inserted into the top of the filter cylinder on the right adjacent side of the segmentation mesh. The feed pipe has a feed flare at the top and a feed one-way valve is provided on the feed pipe. The extrusion assembly includes a rubber air bladder and a vent pipe. The vent pipe is located on the left outer wall of the filter cylinder. The input end of the vent pipe is connected to an external air pressure source, and the output end of the vent pipe passes through the filter cylinder and is connected to the rubber air bladder, which is located on the left side of the segmentation mesh.

[0008] Furthermore, the self-cleaning component includes a rotating shaft and a drive motor. The rotating shaft is rotatably mounted on the left and right supports and rotatably passes through the slit screen, the pre-filter clamping screen, the micron filter, and the post-filter clamping screen. The drive motor is fixedly mounted on the right outer wall of the filter cartridge. The output end of the drive motor passes through the side wall of the filter cartridge and is fixedly connected to one end of the rotating shaft. Several spiral blades are evenly fixedly mounted on the outer periphery of the rotating shaft between the slit screen and the pre-filter clamping screen. A cleaning plate is fixedly mounted on the side of each spiral blade near the inner wall of the filter cartridge, and the cleaning plate abuts against the inner wall of the filter cartridge. A cleaning brush is fixedly mounted on the side of each spiral blade near the pre-filter clamping screen. The cleaning brushes all abut against the pre-filter mesh and the micron filter. The slag storage assembly includes: a slag storage box, which is fixedly installed on the top inner wall of the fixed frame. A connecting pipe is fixedly inserted into the top wall of the slag storage box. The top of the connecting pipe is connected to the bottom of the filter cylinder and is located on the left side adjacent to the pre-filter mesh. The connecting pipe is located directly below the cleaning brush. A slag storage tray is slidably installed on the left side of the slag storage box, and a sealing gasket is provided at the connection between the slag storage tray and the slag storage box. A connecting valve is provided on the connecting pipe above the fixed frame. A height detection device is provided on the connecting pipe above the connecting valve and on the lower side adjacent to the filter cylinder. The height detection device is electrically connected to the connecting valve through an external control console.

[0009] Furthermore, the filter cartridge is obliquely fixedly installed on the top of the fixed frame by two left end columns and two right end columns, wherein the height of the two left end columns is greater than the height of the two right end columns, so that the bottom surface of the filter cartridge is set at an angle of 5 degrees to 30 degrees with the top surface of the fixed frame.

[0010] Furthermore, the heating assembly includes a heating cylinder and a liquid suction pump, both of which are fixedly mounted on the top of the fixed frame. The input and output ends of the liquid suction pump are respectively connected to the right side of the filter cylinder and the top of the heating cylinder. A dispensing pipe is fixedly inserted into the top of the heating cylinder, and the top of the dispensing pipe has a dispensing flare. A heating plate is fixedly installed in the groove on the inner wall of the heating cylinder. A temperature sensor is fixedly installed on the inner top surface of the heating cylinder, and a temperature controller is fixedly installed on the outer side of the heating cylinder. The heating plate and the temperature sensor are both electrically connected to the temperature controller.

[0011] Furthermore, the stirring assembly includes a stirring shaft and a stirring motor. The stirring shaft is rotatably mounted between the upper and lower inner walls of the heating cylinder, and the stirring motor is fixedly mounted on the top of the heating cylinder. The output end of the stirring motor passes through the top wall of the heating cylinder and is fixedly connected to the top of the stirring shaft. Several stirring blades are uniformly fixedly mounted on the periphery of the stirring shaft.

[0012] Furthermore, the sedimentation assembly includes: a sedimentation cylinder, which is fixedly installed on the top of the fixing plate below the heating cylinder. An inlet pipe is fixedly inserted into the top wall of the sedimentation cylinder, and the top of the inlet pipe passes through the fixing frame and is connected to the bottom of the heating cylinder. An inlet valve is fixedly installed around the inlet pipe. A drain pipe is fixedly inserted into the bottom of the side wall of the sedimentation cylinder, and a drain valve is provided on the drain pipe.

[0013] Furthermore, the air flotation assembly includes: a microbubble releaser, an air compressor, a dissolved air pump, and a dissolved air tank. The microbubble releaser is fixedly installed on the bottom inner wall of the sedimentation cylinder. The microbubble releaser has several annularly arranged air holes, which are unidirectional. The air compressor, dissolved air pump, and dissolved air tank are fixedly installed on the top of the fixed plate. The two input ends of the dissolved air pump are respectively connected to the air outlet of the air compressor and the water outlet pipe of an external water source. The output end of the dissolved air pump is connected to the dissolved air tank. A gas delivery pipe is fixedly inserted into the dissolved air tank. The gas delivery pipe passes through the sedimentation cylinder and is connected to the microbubble releaser.

[0014] Furthermore, the oil suction assembly includes: an oil suction pump, which is fixedly installed on the top of the fixed plate; a hose is fixedly connected to the input end of the oil suction pump; the output end of the oil suction pump is connected to an external oil storage tank; the end of the hose away from the oil suction pump passes through the top of the sedimentation cylinder and extends into the interior of the sedimentation cylinder; a float and a counterweight are fixedly fitted around the outer periphery of the end of the hose located inside the sedimentation cylinder from top to bottom.

[0015] A method for using a multi-stage separation and extraction device for waste cooking oil is also provided, which includes the following steps: S1: The waste cooking oil is poured into the filter cylinder through the feed flare of the feed pipe. As the waste cooking oil passes through the segmented mesh, the pre-filter clamping mesh, the micron filter, and the post-filter clamping mesh, large particles of residue are filtered and intercepted by the segmented mesh and the pre-filter clamping mesh, while small particles of residue are filtered and intercepted by the micron filter. The drive motor is started to rotate the shaft, which in turn drives several spiral blades to rotate, continuously conveying the waste cooking oil towards the pre-filter clamping mesh, the micron filter, and the post-filter clamping mesh. The spiral blades drive the cleaning plates to rotate against the inner wall of the filter cylinder, scraping the inner wall of the filter cylinder to prevent residues in the waste cooking oil from adhering to the inner wall of the filter cylinder. At the same time, the spiral blades drive the cleaning brushes to adhere closely to the pre-filter clamping mesh and the micron filter. The micron filter rotates, continuously cleaning the particulate residue trapped on the pre-filter and micron filter, preventing clogging and keeping them unobstructed without manual disassembly. The cleaned residue enters the connecting pipe, where the connecting valve is closed. When the residue accumulates to the height detection device, the device opens the valve, allowing the residue to be collected and stored in the storage box. Simultaneously, during filtration, the vent pipe inflates the rubber bladder through an external air pressure source. The expanding bladder compresses the waste oil inside the filter cartridge, quickly filtering it to the right side of the micron filter. S2: Start the suction pump to draw the gutter oil filtered by the micron filter into the heating cylinder. Control the temperature controller to start the heating plate to heat the gutter oil in the heating cylinder. The temperature sensor can detect the temperature of the gutter oil in the heating cylinder in real time and feed the data back to the temperature controller. The temperature controller automatically adjusts the power of the heating plate according to the real-time temperature to keep the gutter oil at a suitable temperature. At the same time, pour the ingredients into the feeding tube to accelerate the catalysis and conversion of the gutter oil. Start the stirring motor to drive the stirring shaft to rotate in the heating cylinder. The stirring shaft drives several stirring blades to rotate to stir the gutter oil with added ingredients, accelerate the catalysis and conversion of the gutter oil, reduce the viscosity of the gutter oil, destroy the emulsion structure in the gutter oil, and cause the gutter oil to separate into layers. S3: Start the inlet valve and open the inlet pipe to input the heated waste cooking oil into the sedimentation tank. Start the air compressor and dissolved air pump to mix and pressurize the compressed gas and external water source, and then deliver it to the dissolved air tank. The high-pressure dissolved air water in the dissolved air tank enters the microbubble releaser through the gas delivery pipe. The microbubble releaser generates a large number of microbubbles through the air holes. The microbubbles float up and attach to the oil droplets, forming a "gas-oil complex" and float to the surface of the liquid to form a floating oil layer, which quickly separates the waste cooking oil into layers. After separation, the glycerol and water mixture at the bottom of the sedimentation tank is discharged through the drain pipe. When it is observed that there is no obvious water and glycerol residue in the discharged liquid, close the drain valve. Then, since the float ball always floats on the surface of the liquid, the hose keeps the oil suction port vertically downward through the counterweight. Start the oil suction pump to suck the pure oil through the hose and inject it into the external oil storage tank.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the filter assembly uses a zoned mesh, a pre-filter mesh, a micron-sized filter mesh, and a post-filter mesh to filter and intercept particulate residues in waste cooking oil, thereby increasing the purification quality of the waste cooking oil. The self-cleaning assembly uses a spiral blade, a cleaning plate, and a cleaning brush to simultaneously complete waste cooking oil transportation, cleaning of the filter cylinder wall, and cleaning of the filter screen. The squeezing assembly uses an air bladder and a vent pipe to squeeze the waste cooking oil in the filter cylinder, accelerating the filtration efficiency. The slag storage assembly uses a connecting valve and a height detection device to achieve automatic slag collection without the need for manual cleaning, significantly improving processing efficiency. 2. In this invention, the heating component adds ingredients to the filtered gutter oil through the feeding pipe to accelerate the conversion and catalysis of the gutter oil. Through the cooperation of the heating plate, temperature sensor and temperature controller, the filtered gutter oil can be heated to reduce the viscosity of the gutter oil and destroy the emulsion structure in the gutter oil, so that the gutter oil is separated into layers. The stirring component can stir the gutter oil to accelerate the fusion of the added ingredients and the heating speed. 3. In this invention, a large number of microbubbles can be generated through the sedimentation component and the flotation component. The microbubbles float to the surface and attach to the oil droplets to form an "oil-gas complex". They then float to the surface of the liquid to form a floating oil layer, thereby quickly separating oil and water. The rising of oil droplets is accelerated, and the sedimentation time is shortened by more than 60% compared with natural sedimentation, which meets the needs of batch processing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a multi-stage separation and extraction device for waste cooking oil according to the present invention; Figure 2 This is a schematic plan view of the overall structure of a multi-stage separation and extraction device for waste cooking oil according to the present invention; Figure 3 for Figure 2Schematic diagram of section A in the diagram; Figure 4 for Figure 3 Enlarged diagram of point B in the diagram; Figure 5 This is a frontal sectional view of the filter assembly and self-cleaning assembly of a multi-stage separation and extraction device for waste cooking oil according to the present invention. Figure 6 This is a schematic elevation sectional view of the slag storage component of a multi-stage separation and extraction device for waste cooking oil according to the present invention. Figure 7 This is a schematic elevation sectional view of the heating mechanism of a multi-stage separation and extraction device for waste cooking oil according to the present invention; Figure 8 This is a schematic elevation cross-sectional view of the sedimentation component of a multi-stage separation and extraction device for waste cooking oil according to the present invention; Figure 9 This is a schematic diagram of the air flotation component of a multi-stage separation and extraction device for waste cooking oil according to the present invention; Figure 10 This is a schematic diagram of the oil suction component of a multi-stage separation and extraction device for waste cooking oil according to the present invention.

[0018] Numbering on the map: 1. Fixing frame mechanism; 11. Fixing frame; 12. Fixing plate; 2. Pretreatment mechanism; 21. Filter assembly; 211. Filter cylinder; 212. Feed pipe; 2121. Feed flare; 2122. Feed check valve; 213. Filter screen mechanism; 2131. Left support; 21311. Segmented screen; 2132. Right support; 21321. Pre-filter clamping screen; 21322. Micron filter screen; 21323. Post-filter clamping screen; 214. Left end column; 215. Right end column; 22. Self-cleaning assembly; 221. Rotating shaft; 222. Drive motor; 223. Spiral blade; 224. 1. Cleaning plate; 225. Cleaning brush; 23. Slag storage assembly; 231. Slag storage box; 232. Connecting pipe; 2321. Connecting valve; 2322. Height detection device; 233. Slag storage drawer; 24. Extrusion assembly; 241. Vent pipe; 242. Rubber air bag; 3. Heating mechanism; 31. Heating assembly; 311. Heating cylinder; 312. Liquid suction pump; 313. Heating plate; 314. Temperature controller; 315. Temperature sensor; 316. Feeding pipe; 3161. Feeding flare; 32. Stirring assembly; 321. Stirring shaft; 322. Stirring motor; 323. Stirring blade; 4. Purification mechanism; 41. Sedimentation assembly; 411. Sedimentation cylinder; 412. Liquid inlet pipe; 4121. Liquid inlet valve; 413. Liquid outlet pipe; 4131. Liquid outlet valve; 42. Air flotation assembly; 421. Air compressor; 422. Dissolved air pump; 423. Dissolved air tank; 424. Microbubble releaser; 43. Oil suction assembly; 431. Oil suction pump; 432. Hose; 433. Float; 434. Counterweight. Detailed Implementation

[0019] 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.

[0020] Combined with appendix Figures 1-10 In this embodiment, a multi-stage separation and extraction device for waste cooking oil and its method of use include: The fixed frame mechanism 1 includes a fixed frame 11, and a fixed plate 12 is fixedly installed inside the fixed frame 11. The pretreatment unit 2 includes a filter assembly 21, a self-cleaning assembly 22, a slag storage assembly 23, and a squeezing assembly 24. The filter assembly 21 is installed on the top of the fixed frame 11 and is used to filter and intercept the residue in the waste cooking oil. The self-cleaning assembly 22 is installed inside the filter assembly 21 and is used to clean the inside of the filter assembly 21. The slag storage assembly 23 is installed on the top inner wall of the fixed frame 11 and is connected to the filter assembly 21. It is used to collect and store the residue cleaned by the self-cleaning assembly 22. The squeezing assembly 24 is installed inside the filter assembly 21 and is used to squeeze and filter the waste cooking oil inside the filter assembly 21. Heating mechanism 3 includes heating component 31 and stirring component 32. Heating component 31 is installed on the top of fixed frame 11 and is connected to filter component 21. It is used to heat the filtered waste oil to reduce the viscosity of the waste oil. Stirring component 32 is installed inside heating component 31 and is used to stir the waste oil during heating. Purification unit 4 includes a sedimentation component 41, an air flotation component 42, and an oil suction component 43. The sedimentation component 41 is installed on the top of the fixed plate 12 and is connected to the heating component 31. It is used to settle the heated waste cooking oil. The air flotation component 42 is installed inside the sedimentation component 41. It is used to release microbubbles and attach them to the oil droplets to make them float. The oil suction component 43 is installed on the top of the fixed plate 12 and is connected to the sedimentation component 41. It is used to extract the separated pure oil and inject it into an externally installed oil storage tank.

[0021] Specifically, the waste cooking oil is injected into the filter assembly 21 for filtration. Then, the self-cleaning assembly 22 cleans the inside of the filter assembly 21 to prevent residues in the waste cooking oil from clogging it. The cleaned residues are swept away by the self-cleaning assembly 22 and stored in the sludge storage assembly 23. The heating assembly 31 draws the filtered waste cooking oil into its interior, adds ingredients to the filtered waste cooking oil, and heats it to accelerate the conversion and catalysis of the waste cooking oil and reduce its viscosity. At the same time, the stirring assembly 32 stirs the waste cooking oil to accelerate its heating and ingredient dissolution. The dissolved and heated waste cooking oil enters the sedimentation assembly 41 for sedimentation and purification. The air flotation assembly 42 releases a large number of microbubbles, which adhere to the oil droplets and cause them to float to the surface, thereby causing the waste cooking oil to quickly separate into layers. The desired pure oil floats to the upper layer. The bottom layer of the separated waste cooking oil is discharged through the drain pipe 413. After sedimentation, the upper pure oil is sucked out by the oil suction assembly 43 and injected into the externally installed oil storage tank.

[0022] To facilitate a thorough understanding of the specific structure and principle of the pretreatment mechanism 2 by those skilled in the art, further explanation of the pretreatment mechanism 2 is provided.

[0023] Combined with appendix Figures 1-6 In this embodiment, the filter assembly 21 includes a filter cylinder 211 and a filter screen mechanism 213. The filter cylinder 211 is located on top of the fixed frame 11, and the filter screen mechanism 213 is disposed inside the filter cylinder 211. The filter screen mechanism 213 includes a left support 2131 and a right support 2132 welded from left to right inside the filter cylinder 211. Both the left support 2131 and the right support 2132 are cross-shaped supports. A dividing mesh 21311 is provided on the right side of the left support 2131. The dividing mesh 21311 divides the inside of the filter cylinder 211 into an expansion area and a filtration area. The left side of the right support 2132 is provided with a pre-filter clamp 21321, a micron filter 21322 and a post-filter clamp 21323 from left to right. The micron filter 21322 is clamped by the pre-filter clamp 21321 and the post-filter clamp 21323. The zoned mesh 21311, the pre-filter mesh 21321, and the post-filter mesh 21323 all use large-pore filter mesh with a pore size of 3mm, which can intercept large particles of waste residue in gutter oil and effectively play a preliminary filtering role. The micron filter mesh 21322 uses a small-pore filter mesh with a pore size of 20 microns, which can effectively block the tiny particles of waste residue in gutter oil. The top of the filter cylinder 211 is fixedly connected to the right adjacent side of the dividing grid 21311. The feed pipe 212 is used to pour in the waste oil to be filtered. The top of the feed pipe 212 has a feed flare 2121, which prevents the poured waste oil from splashing and provides a guiding function. A feed one-way valve 2122 is provided on the feed pipe 212 to prevent the waste oil in the filter cylinder 211 from flowing back.

[0024] The self-cleaning component 22 includes a rotating shaft 221 and a drive motor 222. The rotating shaft 221 is rotatably mounted on the left bracket 2131 and the right bracket 2132 via bearings, and the rotating shaft 221 rotatably passes through the slit mesh 21311, the pre-filter clamping mesh 21321, the micron filter 21322, and the post-filter clamping mesh 21323. The drive motor 222 is fixedly mounted on the right outer wall of the filter cartridge 211. The output end of the drive motor 222 passes through the side wall of the filter cartridge 211 and is fixedly connected to one end of the rotating shaft 221. Several bearings are evenly fixedly mounted on the outer periphery of the rotating shaft 221 between the slit mesh 21311 and the pre-filter clamping mesh 21321. Each spiral blade 223 has a cleaning plate 224 fixedly installed on the side of the spiral blade 223 near the inner wall of the filter cylinder 211. The cleaning plate 224 abuts against the inner wall of the filter cylinder 211 and can clean the waste residue attached to the inner wall of the filter cylinder 211. Each spiral blade 223 has a cleaning brush 225 fixedly installed on the side of the spiral blade 223 near the pre-filter mesh 21321. The cleaning brush 225 abuts against the pre-filter mesh 21321 and the micron filter 21322 and can clean the waste residue attached to the pre-filter mesh 21321 and the micron filter 21322. No manual cleaning is required, which improves production efficiency and reduces labor costs.

[0025] The extrusion assembly 24 includes a rubber air bladder 242 and an air pipe 241. The air pipe 241 is located on the left outer wall of the filter cylinder 211. The inlet end of the air pipe 241 is connected to an external air pressure source. The outlet end of the air pipe 241 passes through the filter cylinder 211 and is connected to the rubber air bladder 242. The rubber air bladder 242 can expand and contract and is located on the left side of the dividing grid 21311. The expansion space of the rubber air bladder 242 does not exceed the dividing grid 21311, which can avoid conflict with the operation of the self-cleaning assembly's rotating shaft 221 and spiral blade 223. High-pressure air is injected into the rubber airbag 242 through the vent pipe 241, causing the rubber airbag 242 to expand and squeeze the waste oil in the filter cylinder 211, thus driving the waste oil to be filtered quickly by the micron filter screen 21322.

[0026] The slag storage assembly 23 includes: a slag storage box 231, which is fixedly installed on the top inner wall of the fixed frame 11. A connecting pipe 232 is fixedly inserted into the top wall of the slag storage box 231. The top of the connecting pipe 232 is connected to the bottom of the filter cylinder 211 and is located on the left side of the filter screen 21321. The connecting pipe 232 is located directly below the cleaning brush 225. A slag storage tray 233 is slidably installed on the left side of the slag storage box 231, and a sealing gasket is provided at the connection between the slag storage tray 233 and the slag storage box 231. A connecting valve 2321 is installed on the connecting pipe 232 above the fixed frame 11. A height detection device 2322 is installed on the connecting pipe 232 above the connecting valve 2321 and adjacent to the lower side of the filter cylinder 211. The height detection device 2322 is electrically connected to the connecting valve 2321 through an external control console. The height detection device 2322 is used to identify the height of waste residue deposition in the connecting pipe 232. In this embodiment, the filter cylinder 211 is obliquely fixedly installed on the top of the fixed frame 11 by two left end posts 214 and two right end posts 215. The height of the two left end posts 214 is greater than the height of the two right end posts 215, so that the bottom surface of the filter cylinder 211 is set at a 10-degree angle with the top surface of the fixed frame 11, which is conducive to the flow of the waste oil in the filter cylinder 211 toward the micron filter screen 21322. Through the inclined filter cylinder 211 and the rotating conveying action of the spiral blade 223, the waste oil residue cleaned by the cleaning plate 224 and cleaning brush 225 will fall into the connecting pipe 232 and be located directly above the connecting valve 2321 inside the connecting pipe 232. When the waste residue accumulates to a certain height, it will be detected by the height detection device 2322, and the connecting valve 2321 will be opened by the control console, so that the waste residue deposited in the connecting pipe 232 will fall into the slag storage box 231 and be collected by the slag storage tray 233.

[0027] Specifically, the waste cooking oil is poured into the filter cylinder 211 through the feed funnel 2121 of the feed pipe 212. As the waste cooking oil passes through the zoning mesh 21311, the pre-filter clamping mesh 21321, the micron filter 21322, and the post-filter clamping mesh 21323, large particles of residue are filtered and intercepted by the zoning mesh 21311 and the pre-filter clamping mesh 21321, while small particles of residue are filtered and intercepted by the micron filter 21322. The drive motor 2 is then started. 22 drives the rotating shaft 221 to rotate, which in turn drives several spiral blades 223 to rotate, continuously conveying the waste oil towards the pre-filter mesh 21321, the micron filter mesh 21322, and the post-filter mesh 21323. The spiral blades 223 drive the cleaning plate 224 to rotate against the inner wall of the filter cylinder 211, causing the cleaning plate 224 to scrape against the inner wall of the filter cylinder 211, preventing residues in the waste oil from adhering to the filter cylinder 211. On the inner wall, the spiral blade 223 drives the cleaning brush 225 to rotate closely against the pre-filter mesh 21321 and the micron filter 21322, thereby continuously cleaning the particulate residue intercepted on the pre-filter mesh 21321 and the micron filter 21322, avoiding clogging of the pre-filter mesh 21321 and the micron filter 21322, keeping the pre-filter mesh 21321 and the micron filter 21322 in a clear state, without the need for manual disassembly and cleaning. The residue cleaned by the cleaning plate 224 and the cleaning brush 225 is thrown into the connecting pipe 232 by the centrifugal force generated by the rotation of the spiral blade 223. At this time, the connecting valve 2321 on the connecting pipe 232 is in the closed state. When the residue in the connecting pipe 232 accumulates to the height detection device 2322, the height detection device 2322 controls the connecting valve 2321 to open, and finally the residue will enter the slag storage box 231 along the connecting pipe 232 and be collected and stored. Meanwhile, during the filtration process, the vent pipe 241 can be inflated into the rubber air bag 242 through an external air pressure source. The rubber air bag 242 gradually expands and squeezes the gutter oil inside the filter cylinder 211, so that the gutter oil is quickly filtered to the right side of the micron filter screen 21322, thus accelerating the filtration speed of the gutter oil.

[0028] To facilitate a thorough understanding of the specific structure and principle of the heating mechanism 3 by those skilled in the art, further explanation of the heating mechanism 3 is provided.

[0029] Combined with appendix Figures 1-3 and Figure 7In this embodiment, the heating component 31 includes a heating cylinder 311 and a suction pump 312. The heating cylinder 311 and the suction pump 312 are both fixedly installed on the top of the fixed frame 11. The input end and the output end of the suction pump 312 are respectively connected to the right side of the filter cylinder 211 and the top of the heating cylinder 311, which can draw the filtered gutter oil in the filter cylinder 211 into the heating cylinder 311. When the suction pump 312 is started, it can generate negative pressure in the filter cylinder 211, driving the gutter oil in the filter cylinder 211 through the micron filter 21322. At the same time, the expansion of the rubber air bag 242 can be configured to accelerate the filtration of the gutter oil through the micron filter 21322. A dispensing pipe 316 is fixedly inserted into the top of the heating cylinder 311. The dispensing pipe 316 has a dispensing flared mouth 3161 at the top. The dispensing flared mouth 3161 has the same function as the feed flared mouth 2121. The dispensing pipe 316 adds ingredients to the filtered waste cooking oil in the heating cylinder 311 through the dispensing flared mouth 3161. The specific components of the ingredients are sodium hydroxide and methanol. Sodium hydroxide can convert waste cooking oil, and methanol can catalyze waste cooking oil, accelerating the decomposition of the pure oil required in waste cooking oil. A heating plate 313 is fixedly installed in the groove of the inner wall of the heating cylinder 311. A temperature sensor 315 is fixedly installed on the inner top surface of the heating cylinder 311. A temperature controller 314 is fixedly installed on the outer side of the heating cylinder 311. The heating plate 313 and the temperature sensor 315 are both electrically connected to the temperature controller 314. The heating plate 313 is heated by temperature control 314 and the temperature is displayed on the temperature controller 314 by temperature sensor 315. The heating temperature inside the heating cylinder 311 is controlled at 60 degrees Celsius, which is the optimal conversion temperature for waste cooking oil.

[0030] The stirring assembly 32 includes a stirring shaft 321 and a stirring motor 322. The stirring shaft 321 is rotatably mounted between the upper and lower inner walls of the heating cylinder 311. The stirring motor 322 is fixedly mounted on the top of the heating cylinder 311. The output end of the stirring motor 322 passes through the top wall of the heating cylinder 311 and is fixedly connected to the top end of the stirring shaft 321. Several stirring blades 323 are evenly fixedly mounted on the periphery of the stirring shaft 321. The stirring motor 322 drives the stirring shaft 321 to rotate, and the stirring shaft 321 drives several stirring blades 323 to rotate, continuously stirring the gutter oil, so that the added ingredients can be quickly dissolved in the gutter oil, and at the same time, the heating speed of the gutter oil is accelerated.

[0031] Specifically, the suction pump 312 is started to draw the gutter oil filtered by the micron filter screen 21322 into the heating cylinder 311. The temperature controller 314 starts the heating plate 313 to heat the gutter oil in the heating cylinder 311. The temperature sensor 315 can detect the temperature of the gutter oil in the heating cylinder 311 in real time and feed the data back to the temperature controller 314 in real time. The temperature controller 314 automatically adjusts the power of the heating plate 313 according to the real-time temperature to keep the gutter oil at a suitable temperature. At the same time, the ingredients are poured into the feeding flare 3161 of the feeding pipe 316 to accelerate the catalysis and conversion of the gutter oil. The stirring motor 322 is started to drive the stirring shaft 321 to rotate in the heating cylinder 311. The stirring shaft 321 drives several stirring blades 323 to rotate to stir the gutter oil with added ingredients, accelerate the catalysis and conversion of the gutter oil, reduce the viscosity of the gutter oil, destroy the emulsion structure in the gutter oil, and cause the gutter oil to separate into layers. The stratified waste cooking oil is a mixture of pure oil (diesel), water, and glycerin, with the pure oil on top and the water and glycerin on the bottom.

[0032] To facilitate a thorough understanding of the specific structure and principle of the purification mechanism 4 by those skilled in the art, further explanation of the purification mechanism 4 is provided.

[0033] Combined with appendix Figures 1-3 , Figures 8-10 In this embodiment, the sedimentation assembly 41 includes: a sedimentation cylinder 411, which is fixedly installed on the top of the fixing plate 12 below the heating cylinder 311. An inlet pipe 412 is fixedly inserted into the top wall of the sedimentation cylinder 411, and the top of the inlet pipe 412 passes through the fixing frame 11 and is connected to the bottom of the heating cylinder 311. An inlet valve 4121 is fixedly installed around the inlet pipe 412. By opening the inlet valve 4121, the waste oil in the heating cylinder 311 can flow into the sedimentation cylinder 411 through the inlet pipe 412. A drain pipe 413 is fixedly inserted into the bottom of the side wall of the sedimentation cylinder 411. A drain valve 4131 is provided on the drain pipe 413. The drain valve 4131 is used to drain the mixture of water and glycerin that has settled in the lower layer. The mixture of water and glycerin can be processed and utilized externally, so that the resources can be fully utilized.

[0034] The air flotation assembly 42 includes a microbubble releaser 424, an air compressor 421, a dissolved air pump 422, and a dissolved air tank 423. The microbubble releaser 424 is fixedly installed on the bottom inner wall of the sedimentation cylinder 411. The microbubble releaser 424 has several annular arrays of air holes, which are unidirectional. The air compressor 421, the dissolved air pump 422, and the dissolved air tank 423 are fixedly installed on the top of the fixing plate 12. The two input ends of the dissolved air pump 422 are respectively connected to the air outlet of the air compressor 421 and the water outlet pipe of the external water source. The output end of the dissolved air pump 422 is connected to the dissolved air tank 423. A gas supply pipe is fixedly inserted into the dissolved air tank 423. The gas supply pipe passes through the sedimentation cylinder 411 and is connected to the microbubble releaser 424.

[0035] The air flotation assembly 42 includes a microbubble releaser 424, an air compressor 421, a dissolved air pump 422, and a dissolved air tank 423. The microbubble releaser 424 is fixedly installed on the bottom inner wall of the sedimentation cylinder 411. The microbubble releaser 424 has several annular arrays of air holes, which are unidirectional. The air compressor 421, the dissolved air pump 422, and the dissolved air tank 423 are fixedly installed on the top of the fixing plate 12. The two input ends of the dissolved air pump 422 are respectively connected to the air outlet of the air compressor 421 and the water outlet pipe of the external water source. The output end of the dissolved air pump 422 is connected to the dissolved air tank 423. A gas supply pipe is fixedly inserted into the dissolved air tank 423. The gas supply pipe passes through the sedimentation cylinder 411 and is connected to the microbubble releaser 424.

[0036] The oil suction assembly 43 includes an oil suction pump 431, which is fixedly installed on the top of the fixed plate 12. The input end of the oil suction pump 431 is fixedly connected to a hose 432, and the output end of the oil suction pump 431 is connected to an external oil storage tank. The end of the hose 432 away from the oil suction pump 431 passes through the top of the sedimentation cylinder 411 and extends into the interior of the sedimentation cylinder 411. A float 433 and a counterweight 434 are fixedly fitted around the outer periphery of the end of the hose 432 inside the sedimentation cylinder 411 from top to bottom. The cooperation of the float 433 and the counterweight 434 ensures that the nozzle end of the hose 432 is always located on the upper surface of the waste cooking oil, which facilitates the suction of the pure oil separated from the upper layer of the waste cooking oil.

[0037] Specifically, the inlet valve 4121 is activated to open the inlet pipe 412, allowing the stratified waste cooking oil to be fed into the sedimentation tank 411. The air compressor 421 and dissolved air pump 422 are then activated to mix and pressurize the compressed gas with external water, which is then transported to the dissolved air tank 423. The high-pressure dissolved air water in the dissolved air tank 423 enters the microbubble releaser 424 through the gas delivery pipe. The microbubble releaser 424 generates a large number of microbubbles through its pores. These microbubbles rise and adhere to the oil droplets, forming a "gas-oil complex." The "composite" is the required pure oil, which floats to the surface of the liquid to form a floating oil layer, quickly causing the waste oil to separate into layers. After separation, the glycerol and water mixture at the bottom of the sedimentation tank 411 is discharged through the drain pipe. When it is observed that there is no obvious water and glycerol residue in the discharged liquid, the drain valve 4131 is closed. Subsequently, since the float 433 always floats on the surface of the liquid, the hose 432 keeps the oil suction port vertically downward through the counterweight 434. The oil suction pump 431 is started to suck the pure oil through the hose 432 and inject it into the external oil storage tank.

[0038] This application also provides a method for using a multi-stage separation and extraction device for waste cooking oil, applied to the device mentioned in the above embodiments, specifically including the following steps: S1: The waste cooking oil is poured into the filter cylinder 211 through the feed funnel 2121 of the feed pipe 212. As the waste cooking oil passes through the zoning mesh 21311, the pre-filter clamping mesh 21321, the micron filter 21322, and the post-filter clamping mesh 21323, large particles of residue are filtered and intercepted by the zoning mesh 21311 and the pre-filter clamping mesh 21321, while small particles are filtered and intercepted by the micron filter 21322. The drive motor 222 is started, driving the rotating shaft 221 to rotate. The rotating shaft 221 drives several spiral blades 223 to rotate, continuously conveying the waste cooking oil towards the pre-filter clamping mesh 21321, the micron filter 21322, and the post-filter clamping mesh 21323. The spiral blades 223 drive the cleaning plate 224 to rotate against the inner wall of the filter cylinder 211, causing the cleaning plate 224 to scrape against the inner wall of the filter cylinder 211, avoiding... The residue from the non-gutter oil adheres to the inner wall of the filter cylinder 211. At the same time, the spiral blade 223 drives the cleaning brush 225 to rotate closely against the pre-filter mesh 21321 and the micron filter 21322, thereby continuously cleaning the particulate residue intercepted on the pre-filter mesh 21321 and the micron filter 21322, preventing clogging of the pre-filter mesh 21321 and the micron filter 21322, keeping the pre-filter mesh 21321 and the micron filter 21322 in a clear state without the need for manual disassembly and cleaning. The cleaned residue enters the connecting pipe 232. At this time, the connecting valve 2321 on the connecting pipe 232 is in a closed state. When the residue in the connecting pipe 232 accumulates to the height detection device 2322, the height detection device 2322 controls the connecting valve 2321 to open, and the residue will enter the slag storage box 231 along the connecting pipe 232 to be collected and stored. Meanwhile, during the filtration process, the vent pipe 241 inflates the rubber air bag 242 through an external air pressure source. The rubber air bag 242 gradually expands and squeezes the gutter oil inside the filter cylinder 211, so that the gutter oil is quickly filtered to the right side of the micron filter screen 21322. S2: Start the suction pump 312 to draw the gutter oil filtered by the micron filter screen 21322 into the heating cylinder 311. Control the temperature controller 314 to start the heating plate 313 to heat the gutter oil in the heating cylinder 311. The temperature sensor 315 can detect the temperature of the gutter oil in the heating cylinder 311 in real time and feed the data back to the temperature controller 314 in real time. The temperature controller 314 automatically adjusts the power of the heating plate 313 according to the real-time temperature to keep the gutter oil at a suitable temperature. At the same time, pour the ingredients into the feeding flare 3161 of the feeding pipe 316 to accelerate the catalysis and conversion of the gutter oil. Start the stirring motor 322 to drive the stirring shaft 321 to rotate in the heating cylinder 311. The stirring shaft 321 drives several stirring blades 323 to rotate to stir the gutter oil with added ingredients, accelerate the catalysis and conversion speed of the gutter oil, reduce the viscosity of the gutter oil, destroy the emulsion structure in the gutter oil, and cause the gutter oil to separate into layers. S3: Start the inlet valve 4121 to open the inlet pipe 412 and input the stratified waste cooking oil into the sedimentation tank 411. Start the air compressor 421 and dissolved air pump 422 to mix and pressurize the compressed gas and external water source, and then deliver it to the dissolved air tank 423. The high-pressure dissolved air water in the dissolved air tank 423 enters the microbubble releaser 424 through the gas delivery pipe. The microbubble releaser 424 generates a large number of microbubbles through the air holes. The microbubbles float up and attach to the oil droplets, forming a "gas-oil complex". The oil floats to the surface of the liquid to form a floating oil layer, which quickly separates the wastewater into layers. The oil layer (a mixture of glycerin and water) at the bottom of the wastewater is discharged through the drain pipe 413 until the discharged oil layer becomes the required pure oil (diesel). The drain pipe 413 is then closed through the drain valve 4131. Subsequently, since the float 433 always floats on the surface of the liquid, the hose 432 keeps the oil suction port vertically downward through the counterweight 434. The oil suction pump 431 is started to suck the pure oil through the hose 432 and inject it into the external oil storage tank.

[0039] Tests showed that the waste cooking oil treated using this method achieved a purity of 98.5%, a treatment efficiency 70% higher than existing technologies, a filter clogging rate of less than 1%, and a sedimentation time reduced from 120 minutes to 20 minutes.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-stage separation and extraction device for waste cooking oil, characterized in that, include: A fixing frame mechanism, the fixing frame mechanism including a fixing frame, and a fixing plate is fixedly installed inside the fixing frame; The pretreatment mechanism includes a filter assembly, a self-cleaning assembly, a slag storage assembly, and a squeezing assembly. The filter assembly is installed on the top of a fixed frame and is used to filter and intercept residues in the waste cooking oil. The self-cleaning assembly is installed inside the filter assembly and is used to clean the inside of the filter assembly. The slag storage assembly is installed on the top inner wall of the fixed frame and is connected to the filter assembly to collect and store the residues cleaned by the self-cleaning assembly. The squeezing assembly is installed inside the filter assembly and is used to squeeze and filter the waste cooking oil inside the filter assembly. The heating mechanism includes a heating component and a stirring component. The heating component is installed on the top of the fixed frame and is connected to the filtering component. It is used to heat the filtered waste cooking oil to reduce its viscosity. The stirring component is installed inside the heating component and is used to stir the waste cooking oil during heating. The purification mechanism includes a sedimentation component, an air flotation component, and an oil suction component. The sedimentation component is installed on the top of a fixed plate and is connected to a heating component for sedimenting the heated waste cooking oil. The air flotation component is installed inside the sedimentation component for releasing microbubbles that adhere to the oil droplets and cause them to float. The oil suction component is installed on the top of the fixed plate and is connected to the sedimentation component for sucking out the separated pure oil and injecting it into an externally installed oil storage tank.

2. The multi-stage separation and extraction equipment for waste cooking oil according to claim 1, characterized in that: The filtering components include: The filter cylinder and filter screen mechanism are located on top of a fixed frame. The filter screen mechanism is located inside the filter cylinder and includes a left support and a right support arranged from left to right inside the filter cylinder. A segmentation mesh is arranged on the right side of the left support, and a pre-filter clamping mesh, a micron filter, and a post-filter clamping mesh are arranged from left to right on the left side of the right support. The micron filter is clamped by the pre-filter clamping mesh and the post-filter clamping mesh. The top of the filter cylinder is fixedly connected to the right adjacent side of the dividing grid, and the top of the feed pipe has a feed flare, and a feed one-way valve is provided on the feed pipe. The extrusion assembly includes: The filter cartridge has a rubber airbag and a venting tube. The venting tube is located on the left outer wall of the filter cartridge. The inlet end of the venting tube is connected to an external air pressure source. The outlet end of the venting tube passes through the filter cartridge and is connected to the rubber airbag. The rubber airbag is located on the left side of the zoning grid.

3. The multi-stage separation and extraction equipment for waste cooking oil according to claim 2, characterized in that: The self-cleaning components include: The filter cartridge includes a rotating shaft and a drive motor. The rotating shaft is rotatably mounted on the left and right supports and can rotatably pass through the segmentation mesh, the pre-filter clamping mesh, the micron filter, and the post-filter clamping mesh. The drive motor is fixedly mounted on the right outer wall of the filter cartridge. The output end of the drive motor passes through the side wall of the filter cartridge and is fixedly connected to one end of the rotating shaft. Several spiral blades are evenly fixedly mounted on the outer periphery of the rotating shaft between the segmentation mesh and the pre-filter clamping mesh. A cleaning plate is fixedly mounted on the side of each spiral blade near the inner wall of the filter cartridge, and the cleaning plate abuts against the inner wall of the filter cartridge. A cleaning brush is fixedly mounted on the side of each spiral blade near the pre-filter clamping mesh, and the cleaning brush abuts against the pre-filter clamping mesh and the micron filter. The slag storage assembly includes: The slag storage box is fixedly installed on the top inner wall of the fixed frame. A connecting pipe is fixedly inserted into the top wall of the slag storage box. The top of the connecting pipe is connected to the bottom of the filter cylinder and is located on the left side of the filter screen. The connecting pipe is located directly below the cleaning brush. A slag storage tray is slidably installed on the left side of the slag storage box, and a sealing gasket is provided at the connection between the slag storage tray and the slag storage box. A connecting valve is installed on the connecting pipe above the fixed frame. A height detection device is installed on the connecting pipe above the connecting valve and adjacent to the bottom of the filter cartridge. The height detection device is electrically connected to the connecting valve via an external control console.

4. The multi-stage separation and extraction equipment for waste cooking oil according to claim 2, characterized in that: The filter cartridge is obliquely fixedly installed on the top of the fixed frame by two left end columns and two right end columns, wherein the height of the two left end columns is greater than the height of the two right end columns, so that the bottom surface of the filter cartridge is set at an angle of 5 degrees to 30 degrees with the top surface of the fixed frame.

5. The multi-stage separation and extraction equipment for waste cooking oil according to claim 2, characterized in that: The heating components include: The heating cylinder and the liquid suction pump are both fixedly installed on the top of the fixed frame. The input and output ends of the liquid suction pump are respectively connected to the right side of the filter cylinder and the top of the heating cylinder. A dispensing pipe is fixedly inserted into the top of the heating cylinder, and the top of the dispensing pipe has a dispensing flare. A heating plate is fixedly installed in the groove of the inner wall of the heating cylinder. A temperature sensor is fixedly installed on the inner top surface of the heating cylinder. A temperature controller is fixedly installed on the outer side of the heating cylinder. The heating plate and the temperature sensor are both electrically connected to the temperature controller.

6. The multi-stage separation and extraction equipment for waste cooking oil according to claim 5, characterized in that: The stirring assembly includes: The stirring shaft and the stirring motor are rotatably mounted between the upper and lower inner walls of the heating cylinder. The stirring motor is fixedly mounted on the top of the heating cylinder. The output end of the stirring motor passes through the top wall of the heating cylinder and is fixedly connected to the top of the stirring shaft. Several stirring blades are evenly fixedly mounted on the periphery of the stirring shaft.

7. The multi-stage separation and extraction equipment for waste cooking oil according to claim 5, characterized in that: The precipitation components include: A sedimentation cylinder is fixedly installed on the top of a fixed plate below a heating cylinder. An inlet pipe is fixedly inserted into the top wall of the sedimentation cylinder, and the top of the inlet pipe passes through the fixed frame and is connected to the bottom of the heating cylinder. An inlet valve is fixedly installed around the inlet pipe. A drain pipe is fixedly inserted into the bottom of the side wall of the sedimentation cylinder, and a drain valve is installed on the drain pipe.

8. The multi-stage separation and extraction equipment for waste cooking oil according to claim 7, characterized in that: The air flotation component includes: The system comprises a microbubble releaser, an air compressor, a dissolved air pump, and a dissolved air tank. The microbubble releaser is fixedly installed on the bottom inner wall of the sedimentation cylinder and has several annularly arranged air holes with unidirectional flow. The air compressor, dissolved air pump, and dissolved air tank are fixedly installed on the top of a fixed plate. The two input ends of the dissolved air pump are respectively connected to the air outlet of the air compressor and the water outlet pipe of an external water source. The output end of the dissolved air pump is connected to the dissolved air tank. A gas delivery pipe is fixedly inserted into the dissolved air tank, and the gas delivery pipe passes through the sedimentation cylinder and is connected to the microbubble releaser.

9. The multi-stage separation and extraction equipment for waste cooking oil according to claim 7, characterized in that: The oil-absorbing components include: An oil suction pump is fixedly installed on the top of a fixed plate. A hose is fixedly connected to the input end of the oil suction pump. The output end of the oil suction pump is connected to an external oil storage tank. The end of the hose away from the oil suction pump passes through the top of the sedimentation cylinder and extends into the interior of the sedimentation cylinder. A float and a counterweight are fixedly fitted around the outer periphery of the end of the hose inside the sedimentation cylinder from top to bottom.

10. A method of using a multi-stage separation and extraction device for waste cooking oil, for operating the multi-stage separation and extraction device for waste cooking oil as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: The waste cooking oil is poured into the filter cylinder through the feed inlet of the feed pipe. As the oil passes through the segmented mesh, pre-filter screen, micron filter, and post-filter screen, large particles are filtered out by the segmented mesh and pre-filter screen, while small particles are filtered out by the micron filter. The drive motor is started, causing the rotating shaft to rotate. This shaft drives several spiral blades, continuously conveying the waste cooking oil towards the pre-filter screen, micron filter, and post-filter screen. The spiral blades cause the cleaning plates to rotate, scraping against the inner wall of the filter cylinder to prevent the waste cooking oil from being trapped. Oil residues adhere to the inner wall of the filter cartridge. At the same time, the spiral blades drive the cleaning brush to rotate closely against the pre-filter mesh and micron filter, thereby continuously cleaning the particulate residues intercepted on the pre-filter mesh and micron filter, preventing clogging and keeping the pre-filter mesh and micron filter unobstructed. No manual disassembly and cleaning is required. The cleaned residues enter the connecting pipe. At this time, the connecting valve on the connecting pipe is in the closed state. When the residues in the connecting pipe accumulate to the height detection device, the height detection device controls the connecting valve to open, and the residues will enter the slag storage box along the connecting pipe for collection and storage. Meanwhile, during the filtration process, the vent pipe inflates the rubber bladder through an external air pressure source. The rubber bladder gradually expands and squeezes the waste oil inside the filter cylinder, causing the waste oil to be quickly filtered to the right side of the micron filter screen. S2: Start the suction pump to draw the gutter oil filtered by the micron filter into the heating cylinder. Control the temperature controller to start the heating plate to heat the gutter oil in the heating cylinder. The temperature sensor can detect the temperature of the gutter oil in the heating cylinder in real time and feed the data back to the temperature controller. The temperature controller automatically adjusts the power of the heating plate according to the real-time temperature to keep the gutter oil at a suitable temperature. At the same time, pour the ingredients into the feeding tube to accelerate the catalysis and conversion of the gutter oil. Start the stirring motor to drive the stirring shaft to rotate in the heating cylinder. The stirring shaft drives several stirring blades to rotate to stir the gutter oil with added ingredients, accelerate the catalysis and conversion of the gutter oil, reduce the viscosity of the gutter oil, destroy the emulsion structure in the gutter oil, and cause the gutter oil to separate into layers. S3: Start the inlet valve and open the inlet pipe to input the heated waste cooking oil into the sedimentation tank. Start the air compressor and dissolved air pump to mix and pressurize the compressed gas and external water source, and then deliver it to the dissolved air tank. The high-pressure dissolved air water in the dissolved air tank enters the microbubble releaser through the gas delivery pipe. The microbubble releaser generates a large number of microbubbles through the air holes. The microbubbles float up and attach to the oil droplets, forming a "gas-oil complex", and float to the surface of the liquid to form a floating oil layer, which quickly separates the waste cooking oil into layers. After separation, the glycerol and water mixture in the lower layer of the sedimentation tank is discharged through the drain pipe. When it is observed that there is no obvious water and glycerol residue in the discharged liquid, close the drain valve. Then, since the float ball always floats on the surface of the liquid, the hose keeps the oil suction port vertically downward through the counterweight. Start the oil suction pump to suck the pure oil through the hose and inject it into the external oil storage tank.

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