Device and method for centrifugally purifying grinding fluid

Abstract

The invention discloses a device and method for centrifugally purifying grinding fluid, and relates to the technical field of solid-liquid separation and purification. A first liquid inlet and a first liquid outlet are formed in the upper portion of the dirty liquid tank, and the first liquid inlet of the dirty liquid tank is communicated with the liquid outlet of the magnetic separator; a liquid inlet II and a liquid outlet II for outputting purified liquid are formed in the upper part of the liquid purifying box; the liquid inlet II is communicated with the liquid outlet I; a third liquid outlet in the bottom of the liquid purifying box is communicated with a liquid inlet of the magnetic separator through a conveying pipe so as to circularly convey and filter impurity-containing liquid; a liquid inlet pipeline of the deslagging centrifugal machine is communicated with a fourth liquid outlet in the bottom of the dirty liquid box, and a liquid outlet pipeline of the deslagging centrifugal machine is communicated with a liquid inlet of the magnetic separator so as to centrifugally purify the impurity-containing liquid at the bottom of the dirty liquid box and separate impurities. According to the device, the emulsion can be efficiently recycled and utilized, the working intensity of receiving, storing, discharging and transporting the emulsion dirt is reduced, the equipment maintenance cost is reduced, and the purification efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-liquid separation and purification, and particularly to a device and method for centrifugally purifying grinding fluid. Background Art

[0002] Currently, in the fields of full automation and environmental protection production in steel mills, various display screen processing fields in the semiconductor industry, and the grinding fluid purification fields of various grinders in the machining industry, a large amount of impurities are generated in the grinding fluid of grinders every day. At present, manual cleaning is required, with heavy workload, low efficiency, and high equipment failure rate. The transformation of the emulsion filtration system for roll grinders is currently one of the more severe problems in China. At present, in China, the emulsion is filtered and recycled by adopting a three-stage filtration mode of paper belt filtration, magnetic filtration, and sedimentation tank filtration. Generally speaking, the filtration effect is not good, resulting in large losses in the later stage, and a large amount of manpower is required to clean the sedimentation tank and handle hazardous waste and other tasks, leading to a large workload in the reception, storage, and external transportation of emulsion sludge, and high costs for hazardous waste treatment and equipment maintenance in the production line. It is impossible to effectively realize the efficient recovery and utilization of the emulsion and effectively purify the environment.

[0003] Therefore, how to design a device and method for centrifugally purifying grinding fluid, which can efficiently recover and utilize the emulsion, reduce the workload and intensity of emulsion sludge reception, storage, and external transportation, reduce the equipment maintenance cost, and improve the purification efficiency, is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides a device and method for centrifugally purifying grinding fluid, aiming to solve the technical problems that the traditional grinding fluid purification system cannot efficiently recover and utilize the emulsion and the workload of emulsion sludge treatment is large.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] On the one hand, the present invention provides a device for centrifugally purifying grinding fluid, including:

[0007] A magnetic separator for discharging magnetic impurities in the liquid to be treated;

[0008] A dirty liquid tank, with a first liquid inlet and a first liquid outlet provided at the upper part of the dirty liquid tank. The first liquid inlet of the dirty liquid tank is communicated with the liquid discharge port of the magnetic separator to receive the impurity-containing liquid discharged therefrom;

[0009] A purified liquid tank, an inlet two for liquid is provided at the upper part of the purified liquid tank and an outlet two for outputting purified liquid; the inlet two of the purified liquid tank is communicated with the outlet one to receive the impurity-containing liquid discharged from the dirty liquid tank; the outlet three at the bottom of the purified liquid tank is communicated with the inlet of the magnetic separator through a conveying pipe to circularly convey and filter the impurity-containing liquid.

[0010] A slag-discharging centrifuge, the inlet pipeline of the slag-discharging centrifuge is communicated with the outlet four at the bottom of the dirty liquid tank, and the outlet pipeline of the slag-discharging centrifuge is communicated with the inlet of the magnetic separator to centrifugally purify the impurity-containing liquid at the bottom of the dirty liquid tank and separate out impurities.

[0011] When the device for centrifugally purifying grinding fluid of the present invention is in use, the dirty liquid (such as emulsified liquid or oil liquid containing impurities) output by the grinding equipment is first conveyed to the magnetic separator to remove large-particle iron powder impurities, and the discharged large-particle iron powder impurities can be centrally recovered and processed; the dirty liquid after primary purification discharged from the magnetic separator enters the dirty liquid tank through the inlet one for primary precipitation purification; the impurity-containing liquid after precipitation at the upper part of the dirty liquid tank enters the purified liquid tank through the outlet one and the inlet two for secondary precipitation purification, and the qualified purified liquid after secondary precipitation purification at the upper part of the purified liquid tank is output to the grinding equipment for recycling. The impurity-containing liquid with a high impurity content at the bottom of the dirty liquid tank is conveyed to the slag-discharging centrifuge through the outlet four for centrifugal purification. Since the impurity-containing liquid at the bottom of the dirty liquid tank is in a flowing state, the problem of difficult cleaning caused by a large amount of impurities deposited on the inner wall at the bottom of the dirty liquid tank is solved; the cyclic centrifugal purification by the slag-discharging centrifuge not only improves the purification effect and efficiency of the dirty liquid, but also enables the impurities in the liquid to be centrally discharged and processed. Moreover, the liquid output by the slag-discharging centrifuge passes through the magnetic separator again for impurity removal, further improving the purification effect. The impurity-containing liquid with a high impurity content at the bottom of the purified liquid tank is discharged through the outlet three and circularly conveyed to the magnetic separator for cyclic purification and slag removal. Since the impurity-containing liquid at the bottom of the purified liquid tank is in a flowing state, the problem of difficult cleaning caused by a large amount of impurities deposited on the inner wall at the bottom of the purified liquid tank is solved, and the purification effect of the purified liquid tank can be further improved. In the process of continuously transferring the sludge impurities in the liquid in the purified liquid tank to the dirty liquid tank, the present invention finally discharges them centrally through the magnetic separator and the slag-discharging centrifuge, without the need to stop the machine to clean the sludge impurities deposited in the dirty liquid tank and the purified liquid tank, greatly reducing the intensity of the sludge treatment work, and being able to realize the efficient recovery and utilization of liquids such as emulsified liquid or oil liquid to be decontaminated.

[0012] As a further improvement of the above technical solution, it further includes a blowing and impurity-removing mechanism; the blowing and impurity-removing mechanism includes a gas source and a blowing pipe, and the gas source is connected and communicated with the blowing pipe to supply gas.

[0013] The lower part of the dirty liquid tank is in the shape of a conical funnel; the air blowing port of the air blowing pipe is arranged corresponding to the inclined wall surface at the lower part inside the dirty liquid tank, so as to remove the impurities deposited on the inclined wall surface at the lower part inside the dirty liquid tank by blowing air.

[0014] The beneficial effects of the above technical solution are as follows: Start the air blowing and impurity removing mechanism, and make the air blowing port of its air blowing pipe blow air towards the inclined wall surface at the lower part inside the dirty liquid tank, so that the impurities deposited on the inclined wall surface at the lower part inside the dirty liquid tank are detached and re - mixed into the liquid, and then discharged through the liquid outlet four for cyclic purification and centralized slag discharging treatment, effectively solving the problems that the impurities deposited in the dirty liquid tank are difficult to clean and affect the purification efficiency and effect. By blowing air into the liquid through the air blowing pipe, the oxygen content in the liquid can be increased to reduce the generation of anaerobic bacteria, and further improve the purification quality and quality of liquids such as emulsified liquid.

[0015] As a further improvement of the above technical solution, the dirty liquid tank and the clean liquid tank are arranged horizontally opposite to each other; the magnetic separator is arranged on one side of the dirty liquid tank away from the clean liquid tank above the dirty liquid tank; the first liquid inlet is located at the upper end of one side of the dirty liquid tank away from the clean liquid tank, and the liquid discharge port of the magnetic separator corresponds to above the first liquid inlet; the first liquid outlet is opened on the side wall of the dirty liquid tank close to the clean liquid tank, the second liquid inlet is opened on the side wall of the clean liquid tank close to the dirty liquid tank, and the second liquid inlet is horizontally corresponding to and communicated with the first liquid outlet;

[0016] A slag collection hopper is provided below the slag discharge port of both the magnetic separator and the slag discharge centrifuge.

[0017] The beneficial effects of the above technical solution are as follows: The layout of the dirty liquid tank, the clean liquid tank and the magnetic separator realizes the structural compactness of the purification system, occupies less space, and is conducive to transformation and layout in the existing workshop. The slag collection hopper can centrally store the waste slag and impurities discharged from the corresponding magnetic separator and slag centrifuge, and facilitate the hoisting and external transportation work, reducing the working intensity.

[0018] As a further improvement of the above technical solution, it further includes a liquid transportation control component; the liquid transportation control component includes a first pump body, a second pump body, a first valve, a second valve and a first connecting pipe;

[0019] The input port of the delivery pipe is communicated with the third liquid outlet, and the output port of the delivery pipe is communicated with the liquid inlet of the magnetic separator; the first pump body is installed on the delivery pipe; the first valve is installed on the liquid inlet pipeline, and the second pump body is installed on the liquid inlet pipeline at a position corresponding to between the first valve and the liquid inlet of the liquid inlet pipeline; one end of the first connecting pipe is connected and communicated with a position on the liquid inlet pipeline corresponding to between the first valve and the second pump body, and the other end of the first connecting pipe is connected and communicated with a position on the delivery pipe corresponding to between the first pump body and the output port of the delivery pipe; the second valve is installed on the first connecting pipe.

[0020] As a further improvement of the above technical solution, the liquid delivery control assembly further includes a second connecting pipe, a third valve and a fourth valve;

[0021] The third valve is installed on the delivery pipe at a position corresponding to between the first pump body and the input port of the delivery pipe; one end of the second connecting pipe is connected and communicated with a position on the delivery pipe corresponding to between the third valve and the input port of the delivery pipe, and the other end of the second connecting pipe is connected and communicated with a position on the liquid inlet pipeline corresponding to between the second pump body and the liquid inlet of the liquid inlet pipeline; the fourth valve is installed on the second connecting pipe.

[0022] As a further improvement of the above technical solution, the liquid delivery control assembly further includes a fifth valve and a sixth valve; the fifth valve is installed on the liquid inlet pipeline at a position corresponding to between the second pump body and the other end of the second connecting pipe; the sixth valve is installed on the delivery pipe at a position corresponding to between the other end of the first connecting pipe and the output port of the delivery pipe.

[0023] As a further improvement of the above technical solution, a liquid level gauge is further included, and the liquid level gauge is arranged on the clean liquid tank to monitor the liquid level height of the liquid in the clean liquid tank.

[0024] As a further improvement of the above technical solution, skimmers for skimming off the waste oil in the liquid inside are configured on both the dirty liquid tank and the clean liquid tank.

[0025] On the other hand, the present invention provides a method for centrifugally purifying grinding fluid, using the device for centrifugally purifying grinding fluid, and the specific steps include:

[0026] Step 1: Under the normal operation condition of the device for centrifugally purifying grinding fluid, start the magnetic separator, input the liquid to be treated into the magnetic separator to separate out magnetic impurities, and the liquid removing the magnetic impurities is input into the dirty liquid tank for primary precipitation purification;

[0027] Step 2: The liquid after primary precipitation purification in the dirty liquid tank is transported to the clean liquid tank for secondary precipitation purification;

[0028] Step 3: The impurity-containing liquid at the bottom of the clean liquid tank is transported to the magnetic separator through the delivery pipe to discharge the impurities deposited at the bottom of the clean liquid tank, and cyclic filtration and impurity removal are performed; the impurity-containing liquid at the bottom of the dirty liquid tank is transported to the slag discharge centrifuge through the liquid inlet pipeline to discharge the impurities deposited at the bottom of the dirty liquid tank, and the slag discharge centrifuge centrifugally purifies the input impurity-containing liquid to separate the impurities, and the purified liquid is transported to the magnetic separator through the liquid outlet pipeline for cyclic purification.

[0029] As a further improvement of the above technical solution, the following steps are further included:

[0030] Step 4: When the slag discharge centrifuge fails, Valve 1 closes, and Valves 2, 5, and 6 all open, and Pump 2 starts to pump the impurity-containing liquid at the bottom of the dirty liquid tank through the liquid inlet pipeline, Connecting Pipe 1, and delivery pipe to the magnetic separator for cyclic purification;

[0031] When Pump 1 fails, Valves 3 and 2 both close, and Valves 1, 4, and 5 all open, and Pump 2 starts to pump the impurity-containing liquid at the bottoms of the dirty liquid tank and the clean liquid tank through the delivery pipe, Connecting Pipe 2, and liquid inlet pipeline to the slag discharge centrifuge for cyclic purification;

[0032] When Pump 2 fails, Valves 5 and 6 both close, and Valves 1, 2, 3, and 4 all open, and Pump 1 starts to pump the impurity-containing liquid at the bottoms of the dirty liquid tank and the clean liquid tank through the delivery pipe, Connecting Pipe 2, Connecting Pipe 1, and liquid inlet pipeline to the slag discharge centrifuge for cyclic purification;

[0033] Step 5: Set the upper and lower liquid level limits of the clean liquid tank. When the liquid level gauge detects that the liquid level in the clean liquid tank is higher than the upper liquid level limit or lower than the lower liquid level limit, an alarm is given and the slag discharge centrifuge is shut down.

[0034] It can be seen from the above technical solution that compared with the prior art, the present invention discloses a device and method for centrifugally purifying grinding fluid, having the following advantages and beneficial effects:

[0035] The present invention can achieve clean production and improve the workshop environment; reduce the overlong downtime and cost caused by cleaning the impurities at the bottom of the water tank; reduce the workload of on-site workers, lower the labor intensity, and save the labor cost for cleaning the water tank; the sludge separated by the slag discharge centrifuge is drier than the sludge manually cleaned, and the subsequent treatment of the sludge is more convenient.

[0036] The present invention can be used for the upgrading and transformation of the emulsion filtration system of roll grinders. The purified emulsion has a higher cleanliness, which can improve the machining accuracy and the surface quality of the rolls. It can significantly extend the service life of the emulsion, reduce the cost of purchasing new liquid, reduce the labor and material costs generated by the replacement of filter materials and the like due to filtering the emulsion, as well as the quantity of these waste hazardous wastes to be treated, and can also significantly reduce the maintenance cost of the original emulsion filtration device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0038] Figure 1 Schematic diagram of the overall structure of a device for centrifugally purifying grinding fluid according to the present invention;

[0039] Figure 2 Schematic three-dimensional diagram of the structure of the dirty liquid tank, clean liquid tank, magnetic separator and slag discharge centrifuge of a device for centrifugally purifying grinding fluid according to the present invention;

[0040] Figure 3 Schematic top view of the structure of the dirty liquid tank, clean liquid tank, magnetic separator and slag discharge centrifuge of a device for centrifugally purifying grinding fluid according to the present invention;

[0041] Figure 4 Schematic front view of the structure of the dirty liquid tank, clean liquid tank, magnetic separator and slag discharge centrifuge of a device for centrifugally purifying grinding fluid according to the present invention;

[0042] Figure 5 Schematic side view of the structure of the dirty liquid tank, clean liquid tank, magnetic separator and slag discharge centrifuge of a device for centrifugally purifying grinding fluid according to the present invention;

[0043] Figure 6 Schematic diagram of the structure of the dirty liquid tank of a device for centrifugally purifying grinding fluid according to the present invention and the layout state of the air blowing pipes;

[0044] In the figure: 1. Magnetic separator; 2. Dirty liquid tank; 21. First liquid inlet; 22. First liquid outlet; 23. Fourth liquid outlet; 3. Clean liquid tank; 31. Second liquid inlet; 32. Second liquid outlet; 33. Third liquid outlet; 34. Delivery pipe; 35. Sampling port; 4. Slag discharge centrifuge; 41. Liquid inlet pipeline; 42. Liquid outlet pipeline; 5. Blowing and impurity cleaning mechanism; 51. Blowing pipe; 6. Slag collection hopper; 7. Liquid delivery control assembly; 701. First pump body; 702. Second pump body; 703. First valve; 704. Second valve; 705. First connecting pipe; 706. Second connecting pipe; 707. Third valve; 708. Fourth valve; 709. Fifth valve; 710. Sixth valve; 711. First check valve; 712. Second check valve; 713. Sewage discharge valve; 8. Liquid level gauge; 9. Skimmer; 10. Dirty liquid output pipe of grinding equipment. Detailed implementation mode

[0045] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0047] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0048] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] According to an embodiment of the present invention, as Figures 1 to 6 shown, a device for centrifugally purifying grinding fluid includes: a magnetic separator 1, a dirty liquid tank 2, a clean liquid tank 3, and a slag discharging centrifuge 4.

[0050] The magnetic separator 1 is used to receive the impurity-containing liquid to be processed and separate and discharge the magnetic impurities in the impurity-containing liquid to be processed. The dirty liquid output pipe 10 of the grinding equipment is connected to the inlet of the magnetic separator 1 to convey the dirty liquid (impurity-containing liquid) containing sludge impurities to it.

[0051] The upper part of the dirty liquid tank 2 is provided with a first liquid inlet 21 and a first liquid outlet 22. The first liquid inlet 21 of the dirty liquid tank 2 is connected to the liquid discharge port of the magnetic separator 1 to receive the impurity-containing liquid discharged by the magnetic separator 1.

[0052] The upper part of the clean liquid tank 3 is provided with a second liquid inlet 31 and a second liquid outlet 32 for outputting the purified liquid; the second liquid outlet 32 is connected to the grinding equipment through a pipeline to supply liquid to the grinding equipment; the second liquid inlet 31 of the clean liquid tank 3 is connected to the first liquid outlet 22 to receive the impurity-containing liquid discharged by the dirty liquid tank 2; the third liquid outlet 33 at the bottom of the clean liquid tank 3 is connected to the liquid inlet of the magnetic separator 1 through a delivery pipe 34 to perform cyclic conveyance and filtration of the impurity-containing liquid to remove impurities.

[0053] The inlet pipeline 41 of the slag discharging centrifuge 4 is connected to the fourth liquid outlet 23 at the bottom of the dirty liquid tank 2, and the outlet pipeline 42 of the slag discharging centrifuge 4 is connected to the liquid inlet of the magnetic separator 1 to perform centrifugal purification on the impurity-containing liquid at the bottom of the dirty liquid tank 2 and separate out impurities.

[0054] When the centrifugal purification grinding fluid device of this embodiment is in use, the dirty fluid containing impurities such as emulsified fluid or oil fluid output by the grinding equipment is first transported to the magnetic separator 1 to remove large particle iron powder impurities. The discharged large particle iron powder impurities can be centrally recovered and processed. The dirty fluid discharged from the magnetic separator 1 and purified in the first step enters the dirty fluid tank 2 through the first liquid inlet 21 for primary precipitation purification. The impurity-containing liquid after precipitation in the upper part of the dirty fluid tank 2 enters the clean fluid tank 3 through the first liquid outlet 22 and the second liquid inlet 31 for secondary precipitation purification. The qualified clean fluid after secondary precipitation purification in the upper part of the clean fluid tank 3 is output through the second liquid outlet 32 to the grinding equipment for recycling. The impurity-containing liquid with a high impurity content at the bottom of the dirty fluid tank 2 is transported to the slag discharge centrifuge 4 through the fourth liquid outlet 23 for centrifugal purification. Since the impurity-containing liquid at the bottom of the dirty fluid tank 2 is in a flowing state, the problem of difficult cleaning caused by a large amount of impurities deposited on the inner wall at the bottom of the dirty fluid tank 2 is solved. The cyclic centrifugal purification by the slag discharge centrifuge 4 not only improves the purification effect and efficiency of the dirty fluid, but also enables the impurities in the liquid to be centrally discharged and processed. Moreover, the liquid output by the slag discharge centrifuge 4 is passed through the magnetic separator 1 again for impurity removal, further improving the purification effect. The impurity-containing liquid with a high impurity content at the bottom of the clean fluid tank 3 is discharged through the third liquid outlet 33 and cyclically transported to the magnetic separator 1 for cyclic purification and slag removal. Since the impurity-containing liquid at the bottom of the clean fluid tank 3 is in a flowing state, the problem of difficult cleaning caused by a large amount of impurities deposited on the inner wall at the bottom of the clean fluid tank 3 is solved, and the purification effect of the clean fluid tank 3 can also be further improved. In the process of continuously transferring the sludge impurities in the liquid in the clean fluid tank 3 of the present invention to the dirty fluid tank 2, they are finally centrally discharged through the magnetic separator 1 and the slag discharge centrifuge 4. There is no need to stop the machine to clean the deposited sludge impurities in the dirty fluid tank 2 and the clean fluid tank 3, greatly reducing the intensity of the sludge treatment work, and enabling efficient recovery and utilization of liquids such as emulsified fluid or oil fluid to be decontaminated.

[0055] Specifically, the magnetic separator 1 can be a comb-tooth type large-flow magnetic separator. The slag discharge centrifuge 4 can be an automatic slag discharge rotor purifier, model: Huaxing FZ200-D, including a centrifuge chassis.

[0056] In some embodiments, it further includes a blowing and impurity removal mechanism 5; the blowing and impurity removal mechanism 5 includes a gas source and a blowing pipe 51, and the gas source is connected and communicates with the blowing pipe 51 to supply gas.

[0057] The lower part of the dirty fluid tank 2 is in the shape of a conical funnel; the blowing port of the blowing pipe 51 is arranged corresponding to the inclined wall surface at the lower part inside the dirty fluid tank 2 to remove the impurities deposited on the inclined wall surface at the lower part inside the dirty fluid tank 2 by blowing.

[0058] Start the air blowing and impurity cleaning mechanism 5 so that the air blowing port of the air blowing pipe 51 inclines towards the lower inner inclined wall surface of the dirty liquid tank 2 to blow air, so that the impurities deposited on the lower inner inclined wall surface of the dirty liquid tank 2 are detached and remixed into the liquid, and then discharged through the fourth liquid outlet 23 for cyclic purification and centralized slag discharge treatment, effectively solving the problems of difficult cleaning of the deposited impurities in the dirty liquid tank 2 and affecting the purification efficiency and effect. By aerating into the liquid through the air blowing pipe 51, the oxygen content in the liquid can be promoted to increase to reduce the generation of anaerobic bacteria, and further improve the purification quality and quality of liquids such as emulsions.

[0059] Specifically, there are multiple air blowing pipes 51, and the multiple air blowing pipes 51 are evenly distributed circumferentially along the lower part inside the dirty liquid tank 2; the air blowing directions of the air blowing ports of the multiple air blowing pipes 51 are all arranged circumferentially along the lower part inside the dirty liquid tank 2 to drive the liquid in the lower part inside the dirty liquid tank 2 to rotate clockwise or counterclockwise around the vertical axis to form a liquid vortex by blowing air, and then drive the impurities blown off the inner wall surface of the dirty liquid tank 2 to converge towards the center of the liquid vortex, and then facilitate the centralized discharge of the impurities through the fourth liquid outlet 23.

[0060] Specifically, the air source can be a gas pump or an air compressor; one end of the air blowing pipe 51 is connected to the air outlet of the air source, and the other end of the air blowing pipe 51 is fixed on the lower inner inclined wall surface of the dirty liquid tank 2, and the other end of the air blowing pipe 51 can be shaped by bending to adjust the air blowing direction of the air blowing port. A jet nozzle can be installed at the air blowing port of the air blowing pipe 51 to improve the jet pressure and the effect of jetting and impurity cleaning.

[0061] In some embodiments, the lower parts of both the dirty liquid tank 2 and the clean liquid tank 3 are in the shape of a conical funnel. A plurality of air blowing pipes 51 are also evenly arranged circumferentially on the inclined wall surface of the lower inner conical funnel shape in the clean liquid tank 3 to blow air and clean impurities on the lower inner inclined wall surface of the clean liquid tank 3.

[0062] In some embodiments, the dirty liquid tank 2 and the clean liquid tank 3 are arranged horizontally opposite to each other; the magnetic separator 1 is arranged on one side of the dirty liquid tank 2 away from the clean liquid tank 3 above the dirty liquid tank 2; the first liquid inlet 21 is located at the upper end of one side of the dirty liquid tank 2 away from the clean liquid tank 3, and the liquid discharge port of the magnetic separator 1 corresponds to above the first liquid inlet 21; the first liquid outlet 22 is opened on the side wall of the dirty liquid tank 2 close to the clean liquid tank 3, and the second liquid inlet 31 is opened on the side wall of the clean liquid tank 3 close to the dirty liquid tank 2, and the second liquid inlet 31 is horizontally corresponding to and communicated with the first liquid outlet 22.

[0063] Below the slag discharge ports of both the magnetic separator 1 and the slag discharge centrifuge 4, there are slag collection hoppers 6.

[0064] The layout of the dirty liquid tank 2, the clean liquid tank 3 and the magnetic separator 1 realizes the structural compactness of the purification system, occupies a small space, and is conducive to transformation and layout in the existing workshop. The slag collection hopper 6 can centrally store the sewage slag impurities discharged from the corresponding magnetic separator 1 and the slag centrifuge 4, and is convenient for hoisting and external transportation work, reducing the working intensity.

[0065] Specifically, the dirty liquid tank 2 is arranged closely adjacent to the clean liquid tank 3. Both are installed on the same frame, and the dirty liquid tank 2 and the clean liquid tank 3 are welded into an integral structure. The first liquid outlet 22 of the dirty liquid tank 2 coincides with the second liquid inlet 31 of the clean liquid tank 3 to form an overflow port. The liquid in the upper part of the dirty liquid tank 2 can overflow into the clean liquid tank 3 through the overflow port. The second liquid outlet 32 of the clean liquid tank 3 is located on the side wall of the clean liquid tank 3 away from the dirty liquid tank 2. The fourth liquid outlet 23 is opened at the bottom end of the dirty liquid tank 2, and the third liquid outlet 33 is opened at the bottom end of the clean liquid tank 3. The slag discharge centrifuge 4 is installed on the frame and is arranged corresponding to the upper part of the clean liquid tank 3, so that the overall structure is more compact, the occupied space is smaller, and it is more conducive to the layout in the existing workshop.

[0066] In some embodiments, a sampling port 35 is opened on the outer peripheral side wall of the upper part of the clean liquid tank 3, and a sampling valve is installed at the position corresponding to the sampling port 35 on the outer peripheral side wall of the upper part of the clean liquid tank 3. Opening the sampling valve can discharge the purified liquid in the clean liquid tank, so that the inspection personnel can timely understand the liquid purification situation.

[0067] In some embodiments, a liquid delivery control assembly 7 is further included; the liquid delivery control assembly 7 includes a first pump body 701, a second pump body 702, a first valve 703, a second valve 704 and a first connecting pipe 705.

[0068] The input port of the delivery pipe 34 is communicated with the third liquid outlet 33, and the output port of the delivery pipe 34 is communicated with the liquid inlet of the magnetic separator 1; the first pump body 701 is installed on the delivery pipe 34; the first valve 703 is installed on the liquid inlet pipeline 41, and the second pump body 702 is installed at the position between the first valve 703 and the liquid inlet of the liquid inlet pipeline 41 on the liquid inlet pipeline 41; one end of the first connecting pipe 705 is connected and communicated with the position on the liquid inlet pipeline 41 between the first valve 703 and the second pump body 702, and the other end of the first connecting pipe 705 is connected and communicated with the position on the delivery pipe 34 between the first pump body 701 and the output port of the delivery pipe 34; the second valve 704 is installed on the first connecting pipe 705.

[0069] In some embodiments, the liquid delivery control assembly 7 further includes a second connecting pipe 706, a third valve 707 and a fourth valve 708.

[0070] The third valve 707 is installed at the position on the delivery pipe 34 between the first pump body 701 and the input port of the delivery pipe 34; one end of the second connecting pipe 706 is connected and communicated with the position on the delivery pipe 34 between the third valve 707 and the input port of the delivery pipe 34, and the other end of the second connecting pipe 706 is connected and communicated with the position on the liquid inlet pipeline 41 between the second pump body 702 and the liquid inlet of the liquid inlet pipeline 41; the fourth valve 708 is installed on the second connecting pipe 706.

[0071] In some embodiments, the liquid delivery control assembly 7 further includes a fifth valve 709 and a sixth valve 710; the fifth valve 709 is installed on the liquid inlet pipeline 41 at a position corresponding to the position between the second pump body 702 and the other end of the second connecting pipe 706; the sixth valve 710 is installed on the delivery pipe 34 at a position corresponding to the position between the other end of the first connecting pipe 705 and the output port of the delivery pipe 34.

[0072] Specifically, both the first pump body 701 and the second pump body 702 are impurity pumps, with the model of Southern TD 32-21G / 2SWSCJ; the first valve 703 and the second valve 704 are automatic valves; the third valve 707, the fourth valve 708, the fifth valve 709 and the sixth valve 710 are manual valves.

[0073] In some embodiments, the liquid delivery control assembly 7 further includes a first check valve 711 and a second check valve 712; the first check valve 711 is installed on the delivery pipe 34 at a position corresponding to the position between the other end of the first connecting pipe 705 and the first pump body 701; the second check valve 712 is installed on the liquid inlet pipeline 41 at a position corresponding to the position between one end of the first connecting pipe 705 and the second pump body 702. For the conducting directions of the first check valve 711 and the second check valve 712, refer to Figure 1 the directions indicated by the arrows in

[0074] In some embodiments, the liquid delivery control assembly 7 further includes a drain valve 713; drain valves 713 are installed at the input end of the delivery pipe 34 corresponding to the third valve 707 and at the input end of the liquid inlet pipeline 41 corresponding to the fifth valve 709.

[0075] In some embodiments, a liquid level gauge 8 is further included, and the liquid level gauge 8 is arranged on the clean liquid tank 3 to monitor the liquid level in the clean liquid tank 3.

[0076] Specifically, the liquid level gauge 8 can be a two-point liquid level gauge, configured with an ultra-high liquid level and low liquid level alarm function.

[0077] In some embodiments, both the dirty liquid tank 2 and the clean liquid tank 3 are configured with an oil skimmer 9 for skimming the oil in the liquid inside them.

[0078] Specifically, the oil skimmer 9 is a belt type oil skimmer.

[0079] In some embodiments, the first valve 703, the second valve 704, the third valve 707, the fourth valve 708, the fifth valve 709 and the sixth valve 710 can all be selected as electrically controlled valves; the first pump body 701, the second pump body 702, the first valve 703, the second valve 704, the third valve 707, the fourth valve 708, the fifth valve 709, the sixth valve 710, the liquid level gauge 8, the oil skimmer 9, the magnetic separator 1, the slag discharging centrifuge 4 and the gas source are all electrically connected to the controller and are all controlled by the controller.

[0080] In some embodiments, a grinding fluid proportioning device is further included; the second liquid outlet 32 is connected and communicated with the liquid storage tank of the grinding fluid proportioning device through a conveying pipeline to convey the purified grinding fluid into the liquid storage tank of the grinding fluid proportioning device; a grinding fluid detector is installed in the liquid storage tank of the grinding fluid proportioning device to detect whether the grinding fluid is qualified; when it is unqualified, the missing components are added until the proportion of each component of the grinding fluid is adjusted to meet the standard; the liquid storage tank of the grinding fluid proportioning device is communicated with the grinding fluid supply pipeline of grinding equipment such as a machine tool through a liquid supply pipeline to supply qualified grinding fluid.

[0081] Another embodiment of the present invention provides a method for centrifugally purifying grinding fluid, using a device for centrifugally purifying grinding fluid. The specific steps include:

[0082] Step 1: When the device for centrifugally purifying grinding fluid is operating normally, valve four 708 is normally closed, and valve two 704 is normally closed; start the magnetic separator 1, input the liquid to be treated into the magnetic separator 1 to separate magnetic impurities, and the liquid from which the magnetic impurities are removed is input into the dirty liquid tank 2 for primary precipitation purification.

[0083] Step 2: The liquid purified by primary precipitation in the dirty liquid tank 2 is conveyed into the clean liquid tank 3 for secondary precipitation purification.

[0084] Step 3: Start pump one 701, and convey the impurity-containing liquid at the bottom of the clean liquid tank 3 to the magnetic separator 1 through the conveying pipe 34 to discharge the impurities deposited at the bottom of the clean liquid tank 3 and perform cyclic filtration to remove impurities; start pump two 702, and convey the impurity-containing liquid at the bottom of the dirty liquid tank 2 to the slag discharge centrifuge 4 through the liquid inlet pipeline 41 to discharge the impurities deposited at the bottom of the dirty liquid tank 2, and the slag discharge centrifuge 4 centrifugally purifies the input impurity-containing liquid to separate impurities, and conveys the purified liquid to the magnetic separator 1 through the liquid outlet pipeline 42 for cyclic purification.

[0085] In some embodiments, the following steps are further included:

[0086] Step 4: When the slag discharge centrifuge 4 fails, close valve one 703, open valve two 704, valve five 709 and valve six 710, start pump two 702, and pump the impurity-containing liquid at the bottom of the dirty liquid tank 2 through the liquid inlet pipeline 41, connecting pipe one 705 and conveying pipe 34 to the magnetic separator 1 for cyclic purification. At this time, close valve four 708, open valve three 707, and pump one 701 remains in the started state to convey the impurity-containing liquid at the bottom of the clean liquid tank 3 to the magnetic separator 1.

[0087] When the pump body 1 (701) malfunctions, both the valve 3 (707) and the valve 2 (704) are closed, while the valve 1 (703), the valve 4 (708), and the valve 5 (709) are all open. Then the pump body 2 (702) starts, and pumps the impurity-containing liquid at the bottoms of the dirty liquid tank 2 and the clean liquid tank 3 through the delivery pipe 34, the connecting pipe 2 (706), and the liquid inlet pipeline 41 to the slag discharge centrifuge 4 for cyclic purification.

[0088] When the pump body 2 (702) malfunctions, both the valve 5 (709) and the valve 6 (710) are closed, while the valve 1 (703), the valve 2 (704), the valve 3 (707), and the valve 4 (708) are all open. Then the pump body 1 (701) starts, and pumps the impurity-containing liquid at the bottoms of the dirty liquid tank 2 and the clean liquid tank 3 through the delivery pipe 34, the connecting pipe 2 (706), the connecting pipe 1 (705), and the liquid inlet pipeline 41 to the slag discharge centrifuge 4 for cyclic purification.

[0089] Step 5: Set the upper and lower liquid level limits of the clean liquid tank 3. When the liquid level gauge 8 detects that the liquid level in the clean liquid tank 3 is higher than the upper liquid level limit or lower than the lower liquid level limit, an alarm is given and the slag discharge centrifuge 4 is stopped.

[0090] The following gives a specific example of the transformation project of the emulsion purification system for a hot rolling grinder in a certain factory.

[0091] Table 1

[0092] Material Name Model Specification Material Unit Monthly Consumption Budget Unit Price Budget Total Price Required Delivery Date Declaration Region Usage Youshilu Water-soluble Cutting Fluid SC-95 Barrel 8 3600 28800 Hot Rolling 1580 Grinding Roll Workshop For Grinding Machine

[0093] Table 2

[0094]

[0095] The above data are the falling-off amounts of the grinding wheel sand grains and the roll iron powder when a grinder works continuously for 15 hours, that is, the data of "roll reduction" and "sand body reduction" in the above table.

[0096] Number of roll processing grinders in the hot rolling workshop of a certain factory: 6; Flow rate of a single grinder: 300 L / Min; Daily slag discharge amount of a single grinder: 33.6 kg / hour (combining the data of "roll reduction" and "sand body reduction", 64508 cm 2 ×7.8 (iron specific gravity) / 15 (hours) = 33544.16 grams / hour, that is, ≈33.6 kg / hour);

[0097] Floor area in the workshop pit where equipment and slag hoppers can be placed: Pit size: length 6.4 × width 4 m = 25.6 m 2 ; Water tank size: length 3.5 × width 1.5 m = 5.25 m 2 , Aggregate slag hopper size: length 1.5 × width 1.2 m = 1.8 m 2 , Extended size of the grinder guide rail above: length 1.5 × width 2.8 m = 4.2 m 2That is, the available floor area is (25.6 - 5.25 - 1.8) × 0.5 (space allowance) = 9.3 m 2 ;The available area in the air is (25.6 - 4.2) × 0.8 (space allowance) = 17.12 m 2 。

[0098] The original water tank on-site is transformed according to the design requirements and is divided into two-stage conical water tanks, namely the dirty liquid tank and the clean liquid tank. The dirty liquid tank accounts for 4.5 m 2 、and the clean liquid tank accounts for 2 m 2 ;Compressed air is used to blow the four inclined surfaces at the bottom of the water tank to ensure that there is no impurity accumulation on the inclined surfaces and to promote the reduction of the oxygen content in the water body to reduce the generation of anaerobic bacteria; One of the two return pumps is in use and the other is in standby. The centrifugal liquid extraction ports at the bottoms of the dirty liquid tank and the clean liquid tank are connected by flanges.

[0099] The dirty liquid first passes through a comb-tooth type large-flow magnetic separator, and the emulsified liquid after removing some large-particle iron powder impurities falls into the dirty liquid tank.

[0100] The inlet of the liquid inlet pipeline of the slag discharge centrifuge is designed at the bottom of the V-shaped conical bottom water tank, which is conducive to the centrifuge collecting the liquid with a higher impurity content; A multi-stage sedimentation baffle structure is designed in the water tank to block the impact force of the incoming liquid, which can effectively slow down the flow and accelerate the sedimentation of impurities, and make full use of the sedimentation principle to improve the working efficiency of the centrifuge; The processing flow rate of the centrifuge is greater than the impurity accumulation speed, which can effectively avoid the accumulation and caking at the bottom caused by untimely impurity cleaning.

[0101] Self-circulation path: Design a loop from the liquid outlet of the impurity pump to the magnetic separator. If the slag discharge centrifuge stops for maintenance or fails, it is automatically switched through the PLC controller to form a circulation path that does not pass through the slag discharge centrifuge, so that the impurities at the bottom of the water tank are always in a flowing state, avoiding the accumulation and caking of impurities at the bottom.

[0102] Each of the dirty liquid tank and the clean liquid tank is equipped with a belt type oil skimmer for skimming most of the miscellaneous oil in the incoming liquid.

[0103] The slag discharge centrifuge circulates and purifies the emulsified liquid in the dirty liquid tank and discharges slag automatically at regular intervals; An inclined slag discharge chute is installed at the slag outlet of the slag discharge centrifuge, and the slag falls into a separately pre-placed slag collection hopper. After the slag hopper is full of slag, it is lifted away for treatment by a crane.

[0104] The purified emulsified liquid is supplied to equipment such as machine tools through the existing liquid supply pump for use.

[0105] The slag discharge centrifuge 4 can select a centrifugal purifier equipment. Introduction of the centrifugal purifier equipment (FZ200-D), equipment principle: The oil or liquid to be separated is sucked into the high-speed rotor purifier by the feed pump for high-speed rotation and separation. Due to the specific gravity, the heavy-phase material is separated on the rotor wall, and the light-phase liquid naturally flows out from the bottom in the middle of the rotor. Under a certain gravity field and centrifugal radius, this equipment can minimally separate impurities as small as 5μm. When the impurities in the rotor reach a certain thickness, this equipment automatically discharges the slag.

[0106] Equipment operation process: The liquid to be treated enters the centrifuge through the auxiliary pump; the impurities in the dirty liquid are highly separated and adhere to the inner wall of the cylinder; the treated liquid is discharged back into the circulation tank; after the inner wall of the cylinder is covered with impurities, the equipment starts the automatic slag removal function; the rotation speed of the cylinder is automatically reduced, and the built-in scraper starts to operate for slag removal; the removed impurities fall into the slag collection hopper below the equipment from the slag discharge port.

[0107] Equipment characteristics: Applicable to the filtration, treatment, dehydration and recovery of micron-sized particles in various industrial emulsions; has a high-efficiency separation function, with a rotation speed of up to 3800 RPM; improves the service life of the emulsion, improves the cleanliness of the emulsion, reduces the blockage of nozzles in the equipment, and reduces the number of times of cleaning the circulation tank; circulates and purifies the liquid, can effectively remove particles larger than 5um in the emulsion, and improves the product cleanliness; the equipment automatically discharges slag and operates intelligently, without the need for personnel to operate and monitor, and can work continuously; the equipment does not affect the operation of the original emulsion circulation system; there are no consumables such as filter elements, filter cloths, and filter papers, only requiring electricity and compressed air.

[0108] For the basic parameters of the centrifugal purifier equipment, please refer to Table 3.

[0109] Table 3

[0110]

[0111] Benefit comparison after the project is put into production in Table 4

[0112]

[0113]

[0114] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0115] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for centrifugal purification of grinding fluid, characterized in that: include: A magnetic separator (1) for discharging magnetic impurities from the liquid to be treated; A dirty liquid tank (2), wherein a liquid inlet (21) and a liquid outlet (22) are provided at the upper portion of the dirty liquid tank (2), and the liquid inlet (21) of the dirty liquid tank (2) is connected to the liquid outlet of the magnetic separator (1) to receive the impurity-containing liquid discharged therefrom; A clean liquid tank (3), wherein the upper portion of the clean liquid tank (3) is provided with a second liquid inlet (31) and a second liquid outlet (32) for outputting purified liquid; the second liquid inlet (31) of the clean liquid tank (3) is connected to the first liquid outlet (22) to receive the impure liquid discharged from the dirty liquid tank (2); the third liquid outlet (33) at the bottom of the clean liquid tank (3) is connected to the liquid inlet of the magnetic separator (1) through a delivery pipe (34) to circulate and filter the impure liquid; A slag discharge centrifuge (4), wherein the liquid inlet pipeline (41) of the slag discharge centrifuge (4) is connected to the liquid outlet port 23 at the bottom of the dirty liquid tank (2), and the liquid outlet pipeline (42) of the slag discharge centrifuge (4) is connected to the liquid inlet of the magnetic separator (1), so as to centrifugally purify the impurity-containing liquid at the bottom of the dirty liquid tank (2) and separate out impurities.

2. The device for centrifugally purifying grinding fluid according to claim 1, characterized in that: It also includes an air blowing and cleaning mechanism (5); the air blowing and cleaning mechanism (5) includes an air source and an air blowing pipe (51), the air source is connected to and communicates with the air blowing pipe (51) to supply air; The lower part of the dirty liquid tank (2) is in the shape of a conical funnel; the blowing port of the blowing pipe (51) is arranged corresponding to the lower inclined wall surface of the dirty liquid tank (2) so as to remove impurities deposited on the lower inclined wall surface of the dirty liquid tank (2) by blowing.

3. The device for centrifugally purifying grinding fluid according to claim 1, characterized in that: The dirty liquid tank (2) and the clean liquid tank (3) are arranged horizontally opposite to each other; the magnetic separator (1) is arranged above the dirty liquid tank (2) on a side of the dirty liquid tank (2) away from the clean liquid tank (3); the liquid inlet 1 (21) is located at the upper end of a side of the dirty liquid tank (2) away from the clean liquid tank (3), and the liquid discharge port of the magnetic separator (1) corresponds to the upper side of the liquid inlet 1 (21); the liquid outlet 1 (22) is provided on a side wall of the dirty liquid tank (2) close to the clean liquid tank (3), and the liquid inlet 2 (31) is provided on a side wall of the clean liquid tank (3) close to the dirty liquid tank (2), and the liquid inlet 2 (31) horizontally corresponds to and is connected to the liquid outlet 1 (22); A slag collecting bucket (6) is provided below the slag discharge ports of the magnetic separator (1) and the slag discharge centrifuge (4).

4. The device for centrifugally purifying grinding fluid according to claim 1, characterized in that: It also includes a liquid delivery control component (7); the liquid delivery control component (7) includes a pump body 1 (701), a pump body 2 (702), a valve 1 (703), a valve 2 (704) and a connecting pipe 1 (705); The input port of the delivery pipe (34) is connected to the liquid outlet port three (33), and the output port of the delivery pipe (34) is connected to the liquid inlet port of the magnetic separator (1); the pump body one (701) is installed on the delivery pipe (34); the valve one (703) is installed on the liquid inlet pipeline (41), and the pump body two (702) is installed on the liquid inlet pipeline (41) at a position corresponding to the valve one (703) and the liquid inlet port of the liquid inlet pipeline (41); one end of the connecting pipe one (705) is connected to and connected to a position on the liquid inlet pipeline (41) corresponding to the valve one (703) and the pump body two (702), and the other end of the connecting pipe one (705) is connected to and connected to a position on the delivery pipe (34) corresponding to the pump body one (701) and the output port of the delivery pipe (34); the valve two (704) is installed on the connecting pipe one (705).

5. The device for centrifugally purifying grinding fluid according to claim 4, characterized in that: The liquid delivery control assembly (7) further comprises a connecting pipe 2 (706), a valve 3 (707) and a valve 4 (708); The valve three (707) is installed on the delivery pipe (34) at a position corresponding to the pump body one (701) and the input port of the delivery pipe (34); one end of the connecting pipe two (706) is connected to and communicates with the position on the delivery pipe (34) corresponding to the valve three (707) and the input port of the delivery pipe (34), and the other end of the connecting pipe two (706) is connected to and communicates with the position on the liquid inlet pipeline (41) between the pump body two (702) and the liquid inlet of the liquid inlet pipeline (41); the valve four (708) is installed on the connecting pipe two (706).

6. A device for centrifugal purification of grinding fluid according to claim 5, characterized in that: The liquid delivery control component (7) also includes a valve five (709) and a valve six (710); the valve five (709) is installed on the liquid inlet pipeline (41) at a position corresponding to between the pump body two (702) and the other end of the connecting pipe two (706); the valve six (710) is installed on the delivery pipe (34) at a position corresponding to between the other end of the connecting pipe one (705) and the output port of the delivery pipe (34).

7. The device for centrifugally purifying grinding fluid according to claim 1, characterized in that: It also comprises a liquid level meter (8), which is arranged on the clean liquid tank (3) to monitor the liquid level of the liquid in the clean liquid tank (3).

8. The device for centrifugally purifying grinding fluid according to claim 1, characterized in that: The dirty liquid tank (2) and the clean liquid tank (3) are both provided with an oil skimmer (9) for skimming off the miscellaneous oil in the liquid therein.

9. A method for centrifugally purifying grinding fluid, characterized in that: The device for centrifugally purifying grinding fluid according to any one of claims 1 to 8 comprises the following specific steps: Step 1: When a centrifugal grinding fluid purification device is operating normally, the magnetic separator (1) is started, the liquid to be treated is input into the magnetic separator (1) to separate magnetic impurities, and the liquid from which the magnetic impurities have been removed is input into a dirty liquid tank (2) for primary precipitation purification; Step 2: The liquid after primary sedimentation purification in the dirty liquid tank (2) is transported to the clean liquid tank (3) for secondary sedimentation purification; Step three: conveying the impurity-containing liquid at the bottom of the clean liquid tank (3) to the magnetic separator (1) through the conveying pipe (34) so ​​that the impurities deposited at the bottom of the clean liquid tank (3) are discharged, and circulating filtering and impurity removal are performed; conveying the impurity-containing liquid at the bottom of the dirty liquid tank (2) to the slag discharge centrifuge (4) through the liquid inlet pipeline (41) so that the impurities deposited at the bottom of the dirty liquid tank (2) are discharged, and the slag discharge centrifuge (4) performs centrifugal purification on the input impurity-containing liquid to separate the impurities, and conveying the purified liquid to the magnetic separator (1) through the liquid outlet pipeline (42) for circulating purification.

10. A method for centrifugally purifying grinding fluid according to claim 9, characterized in that: The following steps are also included: Step 4: When the slag discharge centrifuge (4) fails, valve 1 (703) is closed, valve 2 (704), valve 5 (709) and valve 6 (710) are all opened, pump body 2 (702) is started, and the impurity liquid at the bottom of the dirty liquid tank (2) is pumped to the magnetic separator (1) through the liquid inlet pipeline (41), connecting pipe 1 (705) and delivery pipe (34) for circulation and purification; When the pump body 1 (701) fails, the valve 3 (707) and the valve 2 (704) are closed, the valve 1 (703), the valve 4 (708) and the valve 5 (709) are opened, and the pump body 2 (702) is started to pump the impurity liquid at the bottom of the dirty liquid tank (2) and the clean liquid tank (3) through the delivery pipe (34), the connecting pipe 2 (706) and the liquid inlet pipeline (41) to the slag discharge centrifuge (4) for circulation and purification; When the pump body 2 (702) fails, the valve 5 (709) and the valve 6 (710) are both closed, the valve 1 (703), the valve 2 (704), the valve 3 (707) and the valve 4 (708) are all opened, and the pump body 1 (701) is started to pump the impurity liquid at the bottom of the dirty liquid tank (2) and the clean liquid tank (3) through the delivery pipe (34), the connecting pipe 2 (706), the connecting pipe 1 (705) and the liquid inlet pipeline (41) to the slag discharge centrifuge (4) for circulation and purification; Step 5: Setting the upper and lower limits of the liquid level of the clean liquid tank (3). When the liquid level meter (8) detects that the liquid level in the clean liquid tank (3) is higher than the upper limit or lower than the lower limit, an alarm is sounded and the slag discharge centrifuge (4) is shut down.

Images