A centrifugal purification method and device for superfinishing oil of bearing groove

Abstract

The application discloses a kind of superfinishing oil centrifugal purification method and device for bearing channel superfinishing, belong to bearing precision machining technical field.The method is by collecting the turbid superfinishing oil containing iron filings powder and oilstone degerminates powder mixed into oilstone ash suspension, then by centrifugal separator, solid powder is thrown out using density difference, after obtaining clear superfinishing oil, it is sent back to superfinishing machine and recycled.The application replaces traditional filtering mode by centrifugal separation, can completely remove the submicron level oilstone ash that traditional filter element cannot stop, eliminate the quality problems such as slip, sand injury, broken wire during superfinishing process, further reduce bearing assembly noise and channel corrosion risk, while greatly reducing the cost of consumables, further prolong the service life of superfinishing oil.

Description

Technical Field

[0001] This invention relates to the technical field of precision machining equipment for bearings, specifically to a method and apparatus for ultra-precision oil centrifugal purification for ultra-precision machining of bearing raceways. Background Technology

[0002] The ultra-precision machining of the inner and outer ring raceways of a bearing involves grinding the raceway surface back and forth with an oilstone to reduce roughness. During this process, the oilstone itself also wears down—as its resin or metal matrix wears down, the diamond or CBN particles inside fall off. Simultaneously, the bearing raceways being machined also produce extremely fine iron filings. These two types of powder mix together and suspend in the ultra-precision oil. Over time, the oil turns grayish-black, often referred to in the industry as "oil lime," and after a period of processing, the ultra-precision oil becomes dark and cloudy. Purifying the ultra-precision oil using ordinary wound filter cartridges or diatomaceous earth filters cannot completely remove it; very fine, dark-colored sludge will remain suspended within the ultra-precision oil. Filtration and purification methods are costly in two ways. First, they are expensive (filter cartridges or diatomaceous earth, labor time, and electricity consumption). Second, the sludge in the oil can cause slippage and poor cooling in the ultra-fine grooves, affecting the quality of ultra-fine grooves, such as sand damage, broken wires, slippage and incomplete ultra-fine groove penetration, and incomplete ultra-fine groove penetration on one side. Furthermore, after the sludge is squeezed and ground by the oilstone and the groove of the bearing ring, the oil limestone produced on the surface of the groove is not easy to clean, causing corrosion of the product grooves or high decibel values ​​in the noise test after bearing assembly.

[0003] What methods were used to process these oilstones in the past? The most common methods were using a wound filter cartridge or adding diatomaceous earth as a filter aid. However, anyone who has actually worked in this field knows that neither of these methods is ideal. They cannot completely filter the essential oils, and very fine, dark sludge will remain suspended in the essential oils. This is because the powder detached from the oilstone is too fine, some even submicron-sized, and the filter cartridge simply cannot hold it. Diatomaceous earth is also ineffective; after filtration, the oil is still grayish, and there is still a layer of black sludge at the bottom.

[0004] What's more troublesome is that when the oil carries this black sludge during superfinding, the oilstone will slip on the grooves, and the sludge spots in the grooves will corrode them. The outer diameter surface and groove surface cannot be cleaned properly, resulting in white spots, and cooling will also be inadequate. Meanwhile, the products often come out with sand particles, broken wires, and sometimes the grooves are super-clear on one side but still mottled on the other, making cleaning even more of a headache—oil and lime are squeezed onto the groove surface, and even after ultrasonic cleaning for a long time, there are still residues. When the bearings are assembled later, the noise level is measured, and the decibel value often exceeds the standard. With more customer complaints, there are more rework.

[0005] Another issue is cost. Filter cartridges need to be replaced frequently, and diatomaceous earth is also expensive. In addition, there is the labor time required for downtime to change materials, which adds up to a considerable expense. Moreover, the waste filter cartridges and waste diatomaceous earth are considered hazardous waste, which incurs additional costs for disposal.

[0006] Therefore, the industry has focused on improving filter element precision in recent years, from 50μm to 10μm and then to 5μm, generally believing that "improving filter element precision can solve the problem." Some have used magnetic rollers to remove iron filings, but oilstone powder is non-magnetic and cannot be removed, remaining in the oil. Frankly, there's a long-standing technological bias in the industry—the belief that as long as the filter element is fine enough and has enough filtration stages, the oil will be clean, but few have considered alternative methods, such as separation based on density difference rather than interception. Summary of the Invention

[0007] The purpose of this invention is to provide a method and apparatus for centrifugal purification of ultrafine oil for ultra-precision machining of bearing raceways, thereby solving the problems of existing oil-lime filtration methods mentioned in the background section. This invention utilizes density differences to eject powder, thus addressing the existing problems.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a method for centrifugal purification of ultrafine oil for ultrafine machining of bearing raceways, comprising the following steps: S1. Collection: Collect the turbid ultrafine oil produced during the ultrafine machining process of bearing grooves. The turbid ultrafine oil contains oil lime suspension, which is a mixture of iron filings powder and oilstone granulation powder. S2. Centrifugal separation: The turbid super-essential oil collected in step S1 is introduced into a centrifugal separator. The centrifugal force field causes the denser solid particles to settle on the inner wall of the centrifugal separator drum, while the less dense pure super-essential oil gathers in the central area of ​​the centrifugal force field, thereby achieving solid-liquid separation. The solid particles include iron filings and oilstone granulation powder. S3. Clean oil recovery: The pure ultrafine oil obtained after centrifugal separation is exported from the centrifuge and sent back to the ultrafine oil machine for recycling; S4. Sludge removal: Regularly clean the oil sludge deposited inside the centrifuge drum.

[0009] The present invention is further optimized by pre-filtering the turbid super essential oil before introducing it into the centrifuge in step S2 to remove particles with a particle size greater than 50 μm.

[0010] The present invention is further optimized such that the separation factor of the centrifuge is controlled between 500 and 3000.

[0011] This invention also discloses an ultra-fine oil centrifugal purification device, which comprises: A centrifuge has a high-speed rotating drum inside for liquid-solid centrifugal separation of input turbid ultrafine oil; the centrifuge has a liquid inlet and a clean liquid outlet, and an openable cleaning cover is hinged on the top of the centrifuge. An oil inlet pipeline, one end of which is connected to the ultrafine oil sludge discharge port of the ultrafine machine, and the other end is connected to the liquid inlet of the centrifugal separator; A transfer pump is installed on the oil inlet pipeline to provide power; A clean liquid recovery pipeline, one end of which is connected to the clean liquid outlet of the centrifuge, and the other end is connected to the ultrafine oil cleaning liquid storage tank of the ultrafine machine or directly connected to the ultrafine oil circulation pipeline. A slag discharge container is used to collect the separated oil sludge powder, wherein the rotation speed of the centrifugal separator drum is configured to make its separation factor reach a predetermined range so as to simultaneously separate iron filings powder and oilstone granulation powder.

[0012] The invention is further optimized in that the inner wall of the centrifugal separator drum is detachably fitted with a disposable or washable plastic bushing to facilitate the rapid removal of deposited sludge.

[0013] In a further optimization of the present invention, the delivery pump is a gear pump or a diaphragm pump capable of adjusting the flow rate.

[0014] The invention is further optimized by including a control box, which is used to control the start and stop of the centrifuge, the speed and the working status of the transfer pump. The control box is also electrically connected to a control panel and a timer that can perform timed slag discharge of the centrifuge.

[0015] Compared with the prior art, the beneficial effects of the present invention are that the advantages of the present invention compared with the original filtration method are very obvious: 1. The oil is clean, the whetstone is no longer slippery, the cooling is in place, sand particles and broken wires have basically disappeared, there is no oil and lime residue on the surface of the channel, cleaning is much easier, the noise after assembly has also decreased, and batches that used to easily exceed the standards can now pass. 2. More economical: The centrifuge of this invention has no consumables, so there is no need to buy filter cartridges or diatomaceous earth; cleaning the sludge takes only ten minutes or so, which is much faster than changing filter cartridges, and the oil itself can be used for a longer time - it used to have to be changed every three to five days, but now it can be used for half a month and the oil is still clean. 3. It is more convenient, as there is no need to frequently stop the machine to change the filter element, thus increasing the effective production time; rework and waste are also reduced, and workers do not have to deal with rust and noise complaints all day long. 4. More environmentally friendly, with no waste filter cartridges or waste diatomaceous earth. The oil sludge is just iron powder and stone powder, with a simple composition, making it easier to process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram showing the connection between the centrifuge and the ultraprecision machine in Example 1; Figure 2 This is a schematic diagram of the internal structure of a centrifuge.

[0017] Figure 3 This refers to the internal structure of the centrifuge drum in Example 1; Figure 4 This is a schematic diagram of the process flow of a centrifugal purification method for ultra-precision machining of bearing raceways in Example 1.

[0018] In the diagram: 1. Oil inlet pipeline; 2. Ultrafine mill; 3. Centrifuge; 3. Clean liquid outlet; 301. Drive belt; 302. Liquid inlet; 303. Plastic bushing; 304. Rotary drum; 305. Base frame; 306. Centrifuge chamber; 307. Motor; 308. Main drive wheel; 309. Auxiliary drive wheel; 310. Cleaning cover plate; 306. Upper transfer pump; 4. Clean liquid recovery pipeline; 5. Slag discharge container; 6. Control box; 7. Control panel; 9. Timer; 8. 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] Example 1 Please see Figures 1-3 As shown in this embodiment, a centrifugal purification method for ultra-precision machining of bearing raceways is disclosed, which consists of four steps: S1. Remove the oil: Extract the grayish-black, turbid superfine oil containing oil and lime from the superfine machine 2. S2. Centrifugation: Pump the oil into the centrifuge. When the drum rotates at 305, the heavy solids—whether iron filings or oilstone powder—are all thrown to the wall, while the clear oil remains in the middle. The separation factor of the centrifuge should be controlled between 500 and 3000. If the powder is too fine, turn it faster; if the oil viscosity is too high, turn it lower. Adjust the speed flexibly according to the actual situation. S3. Reuse: The cleaned oil from the centrifuge is directly returned to the ultrafine mill 2 for continued use. At this point, the oil is clear, and no black spots are visible under a microscope. S4. Slag removal: When the oil sludge in the rotating drum 305 reaches a certain level, stop the machine and clean it. The oil sludge is dry and looks like a blackish-gray mud cake. Just scrape it off directly.

[0021] This embodiment also discloses an ultra-fine oil centrifugal purification device, which includes: A centrifuge 3 has a high-speed rotating drum 305 inside for liquid-solid centrifugal separation of the input turbid ultra-fine oil; the centrifuge 3 has a liquid inlet 303 and a clean liquid outlet 301, and an openable cleaning cover 3061 is hinged on the top of the centrifuge 3, and the liquid inlet 303 is set on the cleaning cover 3061. An oil inlet pipe 1 is provided, one end of which is connected to the ultrafine oil sludge discharge port of the ultrafine machine 2, and the other end is connected to the liquid inlet 303 of the centrifugal separator 3. A transfer pump 4 is installed on the oil inlet pipeline 1 to provide power; A clean liquid recovery pipeline 5, one end of which is connected to the clean liquid outlet 301 of the centrifuge 3, and the other end is connected to the ultrafine oil cleaning liquid storage tank of the ultrafine machine 2 or directly connected to the ultrafine oil circulation pipeline. A slag container 6 is used to collect the separated oil sludge powder. The rotation speed of the drum 305 of the centrifugal separator 3 is configured to make its separation factor reach a predetermined range so as to simultaneously separate iron filings powder and oilstone granulation powder. A control box 7 is used to control the start and stop, speed and working status of the centrifuge 3 and the transfer pump 4. The control box 7 is also electrically connected to the control console 9 and the timer 8 that can perform timed slag discharge of the centrifuge 3. During operation, by pre-setting the start and stop time and slag removal reminder, the operation can be basically automated, making the whole structure simpler and the operation more convenient; and achieving rapid automation.

[0022] In this embodiment, the centrifuge 3 includes a base frame 306, a centrifuge chamber 307, a motor 308, a main drive wheel 309, and an auxiliary drive wheel 310. The centrifuge chamber 307 and the motor 308 are both mounted on the base frame 306. The output shaft of the motor 308 passes through the base frame 306 and is connected to the main drive wheel 309. The drum 305 is rotatably connected inside the centrifuge chamber 307, and the auxiliary drive wheel 310 is located at the bottom of the drum 305. A drive belt 302 connects the auxiliary drive wheel 310 and the main drive wheel 309. The motor 308 has the following parameters: 220V / 0.35KW, 1410 rpm. During operation, the motor 308 drives the main drive wheel 309 to rotate, and then the drive belt 302 drives the auxiliary drive wheel 310 to rotate, ultimately driving the drum 305 to rotate. In order to facilitate the cleaning of the drum 305 later, the side of the cleaning cover plate 3061 is hinged to the top of the base frame 306 via a rotating shaft. The liquid inlet 303 is set on the cleaning cover plate 3061. In order to facilitate the avoidance of obstacles later, the oil input pipe 1 on the output shaft of the delivery pump 4 is rotatably connected to the output shaft of the delivery pump 4. When it is necessary to open the cleaning cover plate 3061, the oil input pipe 1 on the output shaft of the delivery pump 4 can be rotated to avoid the inability to open the cleaning cover plate 3061.

[0023] In this embodiment, the sludge discharge container 6 is slidably placed on the base frame 306. When the sludge deposited on the inner wall of the drum 305 reaches a certain thickness, the machine can be stopped for cleaning. Cleaning operation instructions During the operation of the centrifuge, iron filings and oilstone powder continuously accumulate on the inner wall of the drum. Depending on the turbidity of the oil and the operating time of the equipment, sludge removal is usually required after a certain period of operation (such as a continuous production shift or a certain number of cumulative operating hours).

[0024] The sludge removal procedure is as follows: Turn off the centrifuge power and wait for the drum to stop rotating completely. Then, open the cleaning cover 3061 and remove the oil sludge cake into the sludge discharge container 6. If there is no bushing inside the drum 305, use a special scraper to remove the oil sludge cake adhering to the inner wall of the drum. Be sure to remove it thoroughly to avoid uneven vibration during the next operation. If a plastic bushing is pre-installed inside the drum, simply pull out the bushing along with the oil sludge and replace it with a new bushing. This process can be significantly shortened. The removed oil sludge cake is blackish-gray, dry, and hard. Its main components are iron filings and oilstone powder. It can be directly treated or recycled as solid waste.

[0025] In a further optimization of this embodiment, to reduce cleaning hassles, a disposable or washable plastic bushing 304 is detachably installed on the inner wall of the drum 305 of the centrifuge 3 to facilitate the quick removal of deposited sludge. In this embodiment, a plastic bushing 304 can be placed inside the drum 305; the bushing can then be removed and replaced with a new one, which is much faster than shoveling sludge. In addition, it is best to pass the oil through a coarse filter screen, 50μm is sufficient, before it enters the centrifuge to prevent large particles from clogging the centrifuge. Moreover, the entire supporting device is relatively simple: a pipe is connected to the sludge port of the ultrafine separator 2, with a gear pump or diaphragm pump installed in the middle, which can also adjust the flow rate, and connected to the centrifuge; the clean oil from the centrifuge is then sent back to the ultrafine separator 2. The following experiment illustrates this: A factory's ultra-precision production line for the inner raceway of deep groove ball bearings uses a light yellow and transparent ultra-precision oil. After continuous processing for a certain period, the oil turns grayish-black, and even after passing it through a wire-wound filter, it remains gray. Spot checks of the products revealed a high rate of sand particles and broken wires on the raceway surface. Even after cleaning, wiping the raceway surface with a white cloth left black marks. When assembled into bearings and tested for noise, a significant proportion exceeded the noise standard. The centrifugation scheme implemented in this example: A centrifuge was installed on-site, with the separation factor adjusted to around 2000; the pump flow rate was controlled within a suitable range; after the centrifuge ran continuously for a period of time, a sample was taken from the oil outlet, and the oil returned to a light yellow and transparent color, with no black spots visible under a microscope. The cleaned oil was returned to the ultrafine polisher for continued use. After continuous operation, daily product sampling revealed: sand particles and broken wires were virtually invisible, and the yield rate significantly improved; the surface of the channels showed no black marks after wiping with a white cloth; the noise level was completely within acceptable limits after assembly, with a significantly lower decibel value than before; after the centrifuge ran for a certain period, a certain thickness of sludge accumulated in the drum, which was cleaned after a short shutdown; the ultrafine oil replacement cycle was significantly extended; in terms of cost, previously purchasing filter cartridges, diatomaceous earth, plus labor and electricity costs, was a considerable expense; now, the centrifuge's power consumption is significantly lower, and the cleaning time is negligible; the consumption of ultrafine oil has also decreased significantly.

[0026] Another factory produces ultra-fine outer ring grooves for tapered roller bearings. This production line has a large output, and the ultra-fine oil gets dirty quickly, requiring frequent oil changes. Previously, they used a diatomaceous earth filter, which required changing the diatomaceous earth multiple times a day, each time requiring a long downtime, resulting in considerable diatomaceous earth costs per month. Moreover, the products consistently had a problem with broken wires, with fine lines frequently visible on the groove surface, leading to constant complaints from the quality control department. After using the centrifugal purification device of this invention, the separation factor was adjusted to around 1500.

[0027] The feedback from the site was as follows: After one shift of centrifuge operation, the oil changed from dark gray to light yellow. After continuous operation for a period of time, the oil remained clear and did not become cloudy again; the problem of broken wires has basically disappeared; quality inspection of a large number of products revealed only a very few with slight broken wires, and the depth was very shallow, unlike before; the cleaning process has also been simplified; previously, the ultrafine-finished rings had to be soaked in the cleaning machine for a long time, and sometimes had to be brushed manually; now the cleaning time has been greatly reduced, and they can be wiped clean with a white cloth; the most obvious improvement was in the assembly workshop feedback; previously, after assembly, a considerable proportion of noise levels were too high, requiring disassembly and re-washing; rings processed with oil purified by centrifugation had assembly noise levels all within acceptable limits. In terms of cost: Diatomaceous earth no longer needs to be purchased, significantly reducing consumable costs; downtime is reduced, and effective production hours are significantly increased; the frequency of changing super oil is greatly reduced, resulting in significant savings in oil costs; According to feedback from this company: they used to think that the problem was with the oilstone, and tried several brands of oilstones, but the broken wires still occurred. However, after using the method of this invention, they discovered that the problem was not with the oilstone at all, but with the powder in the oil. Once the powder was removed, the broken wires naturally disappeared.

[0028] The ultrafine oil separated by the centrifugal separator of this invention is very clean. Its working principle is to separate the oil and solids by utilizing the difference in specific gravity. The separated oil does not contain powdery sludge mixed with oilstone granulation powder and iron filings. This ensures the ultrafine quality of the groove surface of the product in the ultrafine process. The purified ultrafine oil can give full play to its lubricating and cooling effects. The clean ultrafine oil can also be used to rinse the groove of the ultrafine product, ensuring that the groove surface is not uncleaned due to oilstone residue, thereby reducing the occurrence of groove corrosion and reducing the noise level after bearing assembly. At the same time, centrifugal purification can extend the service life of the ultrafine oil, avoid frequent replacement of ultrafine oil and filter element, and increase effective working time.

[0029] Acceleration type: ≤9dB; Speed ​​type: Low frequency ≤17um / s, Mid frequency ≤5um / s, High frequency ≤3um / s.

[0030] Example 2 Meanwhile, since different separation factors have different effects, several settings were tested on site: When the separation factor is low: it is still a bit turbid after spinning, and scattered particles can be seen under a microscope, so the effect is not ideal.

[0031] 500 to 1000: Basically cleared, with a few particles occasionally visible; usable but not optimal.

[0032] 1000 to 2000: The oil is clear and transparent, and particles are barely visible under a microscope. This range is recommended.

[0033] 2000 to 3000: Very clean and better results, but power consumption increases accordingly.

[0034] Over 3000: The cleanliness is not much different from over 2000, but the power consumption is significantly higher, which is not cost-effective.

[0035] In conclusion, the range of 500 to 3000 was determined by comprehensively considering both effectiveness and cost. Below 500, the effect is insufficient; above 3000, the cost-effectiveness decreases.

[0036] 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 method for centrifugal purification of ultra-fine oil used in ultra-precision machining of bearing raceways, characterized in that, Includes the following steps: S1. Collection: Collect the turbid ultrafine oil produced during the ultrafine machining process of bearing grooves. The turbid ultrafine oil contains oil lime suspension, which is a mixture of iron filings powder and oilstone granulation powder. S2, centrifugal separation: The turbid super oil collected in step S1 is introduced into a centrifugal separator (3). The centrifugal force field is used to make the denser solid particles settle on the inner wall of the drum (305) of the centrifugal separator (3), while the less dense pure super oil gathers in the central area of ​​the centrifugal force field, thereby achieving solid-liquid separation; wherein, the solid particles include iron filings powder and oilstone granulation powder. S3, Clean oil recovery: The pure ultrafine oil obtained after centrifugal separation is exported from the centrifuge (3) and sent back to the ultrafine oil machine (2) for recycling; S4. Sludge removal: The oil sludge deposited in the drum (305) of the centrifuge is cleaned regularly.

2. The method for centrifugal purification of ultra-fine oil for ultra-precision machining of bearing raceways according to claim 1, characterized in that, Before introducing the turbid super oil into the centrifuge (3) in step S2, the turbid super oil is pre-filtered to remove particles with a diameter greater than 50 μm.

3. The method for centrifugal purification of ultra-fine oil for ultra-precision machining of bearing raceways according to claim 1, characterized in that, The separation factor of the centrifuge (3) is controlled between 500 and 3000.

4. A superfine oil centrifugal purification device applied to the method of any one of claims 1-3, characterized in that, Include: A centrifuge (3) is provided with a high-speed rotating drum (305) inside, which is used to perform liquid-solid centrifugal separation on the input turbid super essential oil; the centrifuge (3) is provided with a liquid inlet (303) and a clean liquid outlet (301), and an openable cleaning cover (3061) is hinged on the top of the centrifuge (3). An oil inlet pipe (1) is provided, one end of which is connected to the ultrafine oil sludge discharge port of the ultrafine machine (2), and the other end is connected to the liquid inlet (303) of the centrifugal separator (3). A delivery pump (4) is installed on the oil inlet pipeline (1) to provide power; A clean liquid recovery pipeline (5) is provided, with one end of the clean liquid recovery pipeline (5) connected to the clean liquid outlet (301) of the centrifuge (3) and the other end connected to the ultrafine oil cleaning liquid storage tank of the ultrafine machine (2) or directly connected to the ultrafine oil circulation pipeline. A slag container (6) is used to collect the separated oil sludge powder, wherein the rotation speed of the drum (305) of the centrifugal separator (3) is configured to make its separation factor reach a predetermined range so as to simultaneously separate iron filings powder and oilstone granulation powder.

5. The ultra-fine oil centrifugal purification device according to claim 4, characterized in that, The centrifuge (3) includes a base frame (306), a centrifuge box (307), a motor (308), a main drive wheel (309), and an auxiliary drive wheel (310). The centrifuge box (307) and the motor (308) are both mounted on the base frame (306). The output shaft of the motor (308) passes through the base frame (306) and is connected to the main drive wheel (309). The drum (305) is rotatably connected inside the centrifuge box (307), and the auxiliary drive wheel (310) is provided at the bottom of the drum (305). A drive belt (302) is connected between the auxiliary drive wheel (310) and the main drive wheel (309).

6. The ultra-fine oil centrifugal purification device according to claim 5, characterized in that, The inner wall of the drum (305) of the centrifuge (3) is detachably fitted with a disposable or washable plastic bushing (304) to facilitate the rapid removal of deposited sludge.

7. The ultra-fine oil centrifugal purification device according to claim 5, characterized in that, The delivery pump (4) is a gear pump or diaphragm pump with adjustable flow rate.

8. The ultra-fine oil centrifugal purification device according to claim 5, characterized in that, It also includes a control box (7), which is used to control the start and stop of the centrifuge (3), the speed and the working status of the transfer pump (4), and the control box (7) is also electrically connected to a control panel (9) and a timer (8) that can discharge slag from the centrifuge (3) at regular intervals.

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