An integrated online purification and monitoring system for emulsified cutting fluid

Abstract

The present invention discloses an integrated online purification and monitoring system for emulsified cutting fluid. The system can realize online purification of cutting fluid, measurement of true concentration, pollution aging evaluation and precise operation and maintenance of stock solution replenishment, thereby achieving quality stability of processed products and consistency of products of different batches; by integrating various online sensors, the physical and chemical properties of cutting fluid can be measured in real time, and the effective concentration and degree of pollution aging can be output and quantified, replacing traditional offline detection, thereby improving the authenticity and real-time performance of detection. The concentration of cutting fluid can be effectively controlled by replenishing stock solution online, and the effective concentration can be controlled within ±1% of the set value, avoiding concentration fluctuations and improving the quality stability of product production.

Description

Technical Field

[0001] The invention relates to an integrated online purification and monitoring system for emulsified cutting fluid. Background Art

[0002] Cutting fluid plays a role in cooling, lubricating, cleaning and rust prevention, and is an important component in the field of mechanical processing. Cutting fluids are generally divided into three types: fully synthetic cutting fluids, semi-synthetic cutting fluids and emulsified cutting fluids. Depending on the cutting load and lubrication requirements, the base oil content is different. During the service process, cutting fluids will produce various external pollutants. The life span is short and the tank needs to be replaced every 3 to 6 months, resulting in a large amount of hazardous waste emissions, which has become one of the important bottlenecks for the green development of the equipment manufacturing industry.

[0003] During the metal processing process, external impurities such as metal debris, metal powder, dust and other solid impurities will continuously enter the cutting fluid. The accumulation of these impurities will cause the cutting fluid to decompose and fail. The heat generated during the workpiece processing and the metal debris produce a chemical reaction, causing the cutting fluid to deteriorate, reducing the lubrication performance and cooling capacity of the cutting fluid. At the same time, various mineral oils and fats, such as guide oil, hydraulic oil and other miscellaneous oils, will be brought in, which will cause the concentration of the cutting fluid to change, the pH value to decrease, and cause corrosion of metal workpieces; the lubrication effect will deteriorate, the performance of the cutting fluid will become difficult to control, the tool wear phenomenon will be serious, and the quality of the machining surface will deteriorate; it will also cause more foam in the cutting fluid; the particle size of the cutting emulsion will increase, and the cleaning performance will be affected.

[0004] At present, the concentration of cutting fluid is mostly measured offline using a handheld refractometer. However, the mixing of miscellaneous oils and electrolytes in the cutting fluid during use causes a large deviation in the refractive index, making it difficult to measure its true effective concentration. It requires regular calibration by professional manufacturers, which makes it difficult to meet the accuracy and timeliness of concentration control. At the same time, auxiliary pH and conductivity detection are used to determine the risk of bacterial growth and rust, and corresponding additives are added to the tank side, such as pH adjusters (alkali maintenance), chelating agents, etc. The current industry status is that manual addition of stock solutions and additives to the tank side leads to large fluctuations or even distortion in the control of cutting fluid concentration, which seriously affects the quality stability of processed products and the consistency of different batches of products. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to provide an integrated online purification and monitoring system for emulsified cutting fluid. The system purifies the cutting fluid in real time through a purification component, thereby enabling real-time monitoring of the actual concentration of the cutting fluid. The fluid replenishment component is activated based on the monitored actual concentration to replenish the cutting fluid, thereby achieving quality stability of the processed products.

[0006] Technical solution: The integrated online purification and monitoring system of emulsified cutting fluid described in the present invention includes a purification component, a monitoring component and a fluid replenishment component. The purification component includes a liquid suction float floating on the surface of the tank liquid, a pre-filter device, a vacuum air float tank and a butterfly centrifuge. A pressure regulating valve is provided on the connecting pipeline connecting the liquid suction float and the vacuum air float tank; a monitoring component is provided on the pipeline that is pumped from the liquid storage tank to the liquid distribution tank in the emulsified cutting fluid storage tank after centrifugal filtration by the butterfly centrifuge; the monitoring component includes a main pipeline with a bypass pipeline, one end of the main pipeline is connected to the liquid storage tank, and the other end of the main pipeline is connected to the liquid distribution tank, and the bypass pipeline is provided with an online refractometer, an online pH meter, an online conductivity tester, an online viscosity tester ... an online refractometer, an online pH meter, an online conductivity tester, an online viscometer and a pressure sensor; an online refractometer, an online pH meter, an online conductivity tester, an online viscometer and a pressure sensor are respectively connected to an external PLC control box through cables; the liquid replenishment component comprises a stock liquid storage tank, a defoamer liquid storage bottle, a pH adjuster liquid storage bottle, a hard water complexing agent liquid storage bottle, a bactericide liquid storage bottle and a corrosion inhibitor liquid storage bottle; the stock liquid storage tank, the defoamer liquid storage bottle, the pH adjuster liquid storage bottle, the hard water complexing agent liquid storage bottle, the bactericide liquid storage bottle and the corrosion inhibitor liquid storage bottle are respectively connected to a liquid distribution box through connecting pipelines, a flow pump is arranged on the connecting pipeline between the liquid replenishment component and the liquid distribution box, and the flow pump is respectively connected to an external PLC control box through cables; the liquid in the liquid distribution box is pumped into the tank liquid.

[0007] Among them, a liquid level meter is installed in the original liquid storage tank; float level gauges are installed in the defoamer storage bottle, pH adjuster storage bottle, hard water complexing agent storage bottle, bactericide storage bottle and corrosion inhibitor storage bottle. The liquid level meter and float level gauge are connected to the external PLC control box through cables respectively.

[0008] Among them, there is also an ozone generator. The cutting fluid in the storage tank is sterilized by the ozone generator after online monitoring and then enters the liquid distribution box. The ozone generator continuously mixes ozone into the cutting fluid for sterilization, ensuring that the ozone concentration in the cutting fluid is ≥ 0.3mg / L. The sterilization rate reaches 99.96% after continuous circulation for more than 2 times.

[0009] Wherein, the pre-filter device is a basket filter, which performs coarse filtration on the tank liquid to prevent large-size solid impurities or debris from damaging the butterfly centrifuge.

[0010] The air pressure in the vacuum air flotation tank is adjusted to 0.02-0.04Mpa through a pressure regulating valve, and the pressure regulating valve is connected to an external PLC control box through a cable.

[0011] Among them, a deflection valve is provided on the main pipeline of the monitoring component, and two bypass isolation valves are provided on the bypass pipeline. The two bypass isolation valves are respectively located at the liquid inlet end and the liquid outlet end of the bypass pipeline, and the cutting fluid is transferred from the liquid storage tank to the liquid distribution tank through a pump; the main pipeline pressure is adjusted by the deflection valve to provide a pressure difference in the bypass pipeline to realize the circulation of the cutting fluid in the bypass pipeline; the bypass isolation valve at the liquid inlet end is first opened and the bypass isolation valve at the liquid outlet end is closed at the same time, and the opening of the deflection valve is adjusted (so that a pressure difference is generated between the front and rear ends of the pipeline) to make the pressure in the bypass pipeline greater than 0.05mPa, and then the bypass isolation valve at the liquid outlet end is opened to realize the measurement of the corresponding sensor on the bypass pipeline; the deflection valve and the two bypass isolation valves can be connected to the external PLC control box via a cable, and can also be adjusted manually without electronic control. After adjusting the opening of the deflection valve, the entire monitoring process does not need to be adjusted again. During routine maintenance, the two bypass isolation valves on the bypass pipeline are closed, and the corresponding sensors on the bypass pipeline can be repaired or replaced without affecting the flow of tank liquid in the main pipeline.

[0012] Among them, the rotation speed of the butterfly centrifuge needs to be greater than 5000r / min, the centrifugal force generated can reach 6000G, and the solid impurity separation accuracy is 2μm.

[0013] The centrifugal tank of the butterfly centrifuge is equipped with a floating oil collection box and a slag block collection box respectively. The purified and separated cutting fluid is pressurized by a centripetal pump and flows out; the floating oil is agglomerated and freely flows out of the drum as a light phase; the particles settle in the drum as a heavy phase and are triggered by a pressure sensor to be intermittently and automatically discharged from the centrifugal tank.

[0014] Among them, the liquid inlet of the machine tool liquid tank and the liquid outlet corresponding to the liquid suction float are distributed diagonally in the machine tool liquid tank, so that the supplemented original liquid and additives are evenly dispersed in the tank liquid; the liquid inlet of the machine tool liquid tank is connected to the liquid distribution box.

[0015] Among them, the defoaming agent storage bottle is also connected to the liquid storage tank through a connecting pipeline, and a flow meter and a flow pump are provided on the connecting pipeline. The flow meter and the flow pump are respectively connected to the external PLC control box through cables. In order to avoid excessive addition of defoaming agent per unit time, which affects the authenticity of the cutting fluid concentration detected by the online monitoring sensor, the defoaming agent addition flow rate is ≤10mL / min.

[0016] The system of the present invention first removes various pollutants in the cutting fluid, prolongs the service life of the cutting fluid, reduces waste fluid discharge, and reduces the damage and pollution of the cutting fluid to workers and the environment; at the same time, it measures the effective real concentration and pollution degree of the cutting fluid online, and automatically replenishes the fluid to maintain the effective range of the cutting fluid concentration, thereby ensuring the batch consistency and stability of the processed products.

[0017] Beneficial effects: The system of the present invention can realize the precise operation and maintenance of online purification of cutting fluid, measurement of true concentration, pollution aging evaluation and stock solution replenishment, so as to achieve the quality stability of processed products and the consistency of products of different batches; the system of the present invention adopts a combination of vacuum flotation and butterfly centrifugation to efficiently remove external pollution such as solid impurities and impurities oil, effectively reduce the influence of external pollution on the physical and chemical properties of cutting fluid, and thus obtain the true concentration of cutting fluid; at the same time, ozone and vacuum flotation are combined to carry out efficient sterilization and bacteriostasis, and the vacuum flotation device increases the dissolved oxygen concentration in the circulation system to avoid the growth of anaerobic bacteria; ozone, as a strong oxidant, can oxidize and decompose the enzymes required for glucose inside bacteria, inactivate and kill bacteria, and avoid the large-scale growth of bacteria in cutting fluid; thereby, the solid impurity and bacteria removal rate is ≥99%, the filtration accuracy is higher than 2 microns, and bacteria cannot be detected by plate counting method; no impurities oil is precipitated when standing at 35°C for 24 hours; the recovery rate of cutting fluid is ≥90%, and the concentration and pH value retention rate are ≥95%. At the same time, by adding additives online, the service life of the cutting fluid can be greatly extended from 2 to 3 months to 1 to 2 years, and the discharge of waste fluid can be effectively reduced. By integrating various online sensors, the physical and chemical properties of the cutting fluid can be measured in real time, and the effective concentration and degree of pollution and aging can be output and quantified, replacing traditional offline detection, improving the authenticity and real-time nature of the detection. The concentration of the cutting fluid can be effectively controlled by replenishing the stock solution online. The effective concentration can be controlled within ±1% of the set value to avoid concentration fluctuations and improve the quality stability of product production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a system principle diagram of the system of the present invention;

[0019] Figure 2 It is the structural principle diagram of the online rehydration component;

[0020] Figure 3 This is the structural principle diagram of the online monitoring component. DETAILED DESCRIPTION

[0021] like Figures 1 to 3As shown, the integrated online purification and monitoring system of emulsified cutting fluid of the present invention comprises a purification component, a monitoring component and a fluid replenishment component, wherein the purification component comprises a liquid suction float 1 floating on the surface of the tank liquid, a basket filter 2, a vacuum air float tank 4 and a butterfly centrifuge 6, and a pressure regulating valve 3 is provided on the connecting pipeline connecting the liquid suction float 1 and the vacuum air float tank 4; a monitoring component is provided on the pipeline in the emulsified cutting fluid storage tank 9 after centrifugal filtration by the butterfly centrifuge 6 and pumped from the storage tank 9 to the liquid distribution tank 18; the monitoring component comprises a main pipeline with a bypass pipeline, one end of the main pipeline is connected to the storage tank 9, and the other end of the main pipeline is connected to the liquid distribution tank 18, and an online refractometer 12, an online pH meter 13, an online conductivity tester 14, an online viscometer 15 and a pressure sensor 16 are provided on the bypass pipeline; the online refractometer 12, the online pH meter 13, the online conductivity tester 14, the online viscometer 15 and the pressure sensor 16 are respectively connected to an external PLC control box through cables The liquid replenishment component includes a stock liquid storage tank 19, a defoamer storage bottle 20, a pH adjuster storage bottle 21, a hard water complexing agent storage bottle 22, a bactericide storage bottle 23 and a corrosion inhibitor storage bottle 24; the stock liquid storage tank 19, the defoamer storage bottle 20, the pH adjuster storage bottle 21, the hard water complexing agent storage bottle 22, the bactericide storage bottle 23 and the corrosion inhibitor storage bottle 24 are respectively connected to the liquid distribution box 18 through connecting pipes, and the connecting pipes between the liquid replenishment component and the liquid distribution box 18 are connected to the liquid distribution box 18. A flow pump 30 is provided on the top, and a liquid level meter 29 is provided in the stock liquid storage tank 19. A float level meter 31 is provided in the defoamer storage bottle 20, the pH adjuster storage bottle 21, the hard water complexing agent storage bottle 22, the bactericide storage bottle 23 and the corrosion inhibitor storage bottle 24. The float level meter 31, the liquid level meter 29 and the flow pump 30 are respectively connected to the external PLC control box through cables; the liquid in the liquid distribution box 18 is sent to the machine tool tank 32 through the diaphragm pump II25. The liquid inlet 33 of the machine tool tank 32 and the liquid outlet corresponding to the liquid suction float are diagonally distributed in the machine tool tank 32, so that the replenished stock liquid and additives are evenly dispersed in the tank liquid.

[0022] The liquid inlet of the vacuum air flotation tank 4 is connected to the liquid suction float 1. Because the cutting fluid may be contaminated with miscellaneous oil or oil separation problems to varying degrees during use, the cutting fluid system in the machine tool liquid tank 32 changes, and the particle size of the cutting fluid gradually increases from bottom to top, and there is even obvious floating oil on the liquid surface. In order to clean up the floating oil and large-particle cutting fluid in time, the liquid suction float 1 is used to extract the liquid. The liquid suction float 1 floats on the liquid surface and can immediately absorb the large-particle floating oil that has aggregated and floated up into the vacuum air flotation tank 4, thereby greatly improving the processing efficiency and effect of the purification component. A detachable basket filter 2 is installed between the liquid suction float 1 and the liquid inlet of the vacuum air float tank 4. The basket filter 2 can prevent large particles of impurities from entering the butterfly centrifuge 6; the liquid outlet of the vacuum air float tank 4 is connected to the vacuum water pump 5, and a pressure regulating valve 3 is also installed between the liquid suction float 1 and the liquid inlet of the vacuum air float tank 4. The pressure regulating valve 3 keeps the air pressure in the tank at 0.03MPa. The vacuum air float tank 4 directly sucks the tank liquid into the vacuum tank through the liquid suction float 1. The liquid suction float 1 will also suck a certain amount of air. The pressure reduction in the vacuum air float tank 4 will precipitate a large amount of fine dissolved gas, and together with the air sucked by the liquid suction float 1, a highly dispersed gas-liquid mixture will occur in the vacuum air float tank 4. The highly dispersed tiny bubbles will destroy the stability of the original system of solid particles and oil particles, making them more likely to aggregate and separate and form scum and floating oil.

[0023] The butterfly centrifuge 6 is connected to the liquid storage tank 9 and is equipped with a defoaming agent to replenish the liquid to avoid the generation of tank foam and overflow. In order to avoid excessive addition of defoaming agent per unit time, which affects the authenticity of the online monitoring sensor detecting the concentration of the cutting fluid, the defoaming agent addition flow rate is ≤10mL / min. The cutting fluid in the liquid storage tank 9 is pumped to the liquid distribution tank 18 by a diaphragm pump I10. A bypass pipeline is first connected in parallel to the pumping main pipeline to install the online monitoring sensor assembly. The pressure and flow rate of the bypass pipeline are controlled by the deflection valve 11 on the main pipeline. Then, an ozone generator 17 is installed in series between the main pipeline and the liquid distribution tank 18. Ozone is continuously mixed into the cutting fluid through the ozone generator 17 for sterilization, ensuring that the ozone concentration in the cutting fluid is ≥0.3mg / L or more. The sterilization rate reaches 99.96% after continuous circulation for more than 2 times.

[0024] A pressure regulating valve 3 is installed between the special liquid suction float 1 and the vacuum air float tank 4 to control the air pressure in the vacuum air float tank 4 at 0.03Mpa. The tank liquid is continuously pumped into the butterfly centrifuge 6 and the liquid storage tank 9 under the drive of the vacuum water pump 5. The pressure regulating valve 3 adjusts the pressure of the vacuum air float tank 4 to achieve the floating of the mixed air and the dissolved gas in the tank liquid, destroy the stability of the mixed oil system, and achieve the coalescence of the unstable emulsion; the unstable emulsion system is pumped into the high-speed butterfly centrifuge 6 by the vacuum water pump 5 to achieve the three-phase separation of low-density mixed oil, system-stabilizing cutting fluid and high-density solid impurities, and the floating oil collection box 7 and the slag block collection box 8 are respectively used for the separation. Collect miscellaneous oil and solid impurities, the speed of the butterfly centrifuge 6 is greater than 5000r / min, and the separation accuracy of solid impurities is not more than 2μm; a liquid level sensor is provided in the liquid storage tank 9, and the defoaming agent storage bottle 20 is also connected to the liquid storage tank 9 through a connecting pipeline. A flow meter and a flow pump are provided on the connecting pipeline. The flow meter and the flow pump are connected to the external PLC control box through cables respectively. In order to avoid excessive addition of defoaming agent per unit time, which affects the authenticity of the cutting fluid concentration detected by the online monitoring sensor, the defoaming agent addition flow rate is ≤10mL / min, and the overflow of the liquid storage tank 9 is avoided by controlling the large-flow diaphragm pump I10.

[0025] A deflection valve 11 is provided on the main pipeline of the monitoring component, and two bypass isolation valves 28 are provided on the bypass pipeline. The two bypass isolation valves 28 are respectively located at the liquid inlet end and the liquid outlet end of the bypass pipeline. The cutting fluid is transferred from the liquid storage tank 9 to the liquid distribution tank 18 through the diaphragm pump I10; the main pipeline pressure is adjusted by the deflection valve 11 to provide a bypass pipeline pressure difference to realize the circulation of the cutting fluid in the bypass pipeline; specifically: first open the bypass isolation valve 28 at the liquid inlet end and close the bypass isolation valve 28 at the liquid outlet end at the same time, adjust the opening of the deflection valve 11 (so that a pressure difference is generated between the front and rear ends of the main pipeline) so that the pressure in the bypass pipeline is greater than 0.05mPa (the pressure of the bypass pipeline is detected by the pressure sensor 16), and then open the bypass isolation valve 28 at the liquid outlet end to realize the measurement of the corresponding sensor on the bypass pipeline. The bypass pipe is provided with a sensor flow cell 27, which can realize online detection of the online refractometer 12, the online pH meter 13, the online conductivity tester 14, the online viscometer 15 and the pressure sensor 16, with a sampling frequency of not less than 30 times / h. The online refractometer 12 can output the refractive index (nD) of the cutting fluid, with a measurement range of 1.3200-1.3650; the online viscometer (online viscosity sensor) 15 adopts tuning fork mechanical resonance, with a measurement range of 0-20mm2 / s and a measurement accuracy of 3% Value, and has high measurement repeatability and application cost performance; the online pH meter 13 and the online conductivity tester 14 also have temperature compensation function.

[0026] The purified and adjusted cutting fluid in the liquid distribution box 18 is pumped to the machine tool liquid tank 32 through a large-flow diaphragm pump II25. A liquid level sensor is provided in the liquid distribution box 18, and overflow of the liquid distribution box 18 is avoided by controlling the large-flow diaphragm pump II25. The liquid distribution box 18 is also equipped with an online liquid replenishment component to realize online replenishment (automatic replenishment through PLC control) of the stock solution and additives (auxiliary agents include pH adjusters, hard water complexing agents, bactericides, defoamers, and corrosion inhibitors). The defoamer is polyether-modified polysiloxane, the pH adjuster is diethanolamine, the hard water complexing agent is ethylenediaminetetraacetic acid (EDTA), the bactericide can be selected as BK bactericide, and the corrosion inhibitor is a combination of 40% sodium benzoate and 60% borate.

[0027] The vacuum water pump 5, diaphragm pump I10 and diaphragm pump II25 of the present invention are connected to the external PLC control box through cables. Liquid level sensors are provided in the liquid storage tank 9 and the liquid distribution tank 18, and the start and stop of the vacuum water pump 5, diaphragm pump I10 and diaphragm pump II25 are controlled by the PLC control unit to avoid overflow.

[0028] The PLC controller is used to collect data from each sensor in real time, determine the effective concentration and contamination degree of the cutting fluid, and output it quantitatively; the on-site human-machine interaction interface can display the detection data in real time, and use a touch screen and sound and light alarm for human-machine interaction; through the boundary conditions input such as the machine tool tank liquid volume, effective concentration, and contamination degree, the original liquid and additives are automatically replenished according to the set control threshold, so that the effective concentration is controlled within ±1% of the set value. The on-site process records and data are communicated and interacted with the factory control room in real time through the industrial bus.

[0029] Table 1 is a comparison of the effects of using the system of the present invention to operate and maintain the cutting fluid in the machine tool tank and using the existing method to operate and maintain the cutting fluid in the machine tool tank.

[0030] Table 1

[0031]

Claims

1. An integrated online purification and monitoring system for emulsified cutting fluid, characterized in that: The invention comprises a purification component, a monitoring component and a liquid replenishment component. The purification component comprises a liquid suction float (1) floating on the surface of the tank liquid, a pre-filter device (2), a vacuum air float tank (4) and a butterfly centrifuge (6). A pressure regulating valve (3) is provided on the connecting pipeline connecting the liquid suction float (1) and the vacuum air float tank (4), and the air pressure in the tank is maintained at 0.03 MPa through the pressure regulating valve (3). A monitoring component is provided on the pipeline from the liquid storage tank (9) to the liquid distribution tank (18) after the emulsified cutting fluid is centrifugally filtered by the butterfly centrifuge (6). The monitoring component comprises a main pipeline with a bypass pipeline, one end of the main pipeline is connected to the liquid storage tank (9), and the other end of the main pipeline is connected to the liquid distribution tank (18). The bypass pipeline is provided with an online refractometer (12), an online pH meter (13), an online conductivity tester (14), an online viscosity meter (15) and a pressure sensor (16). The online refractometer (1 2), the online pH meter (13), the online conductivity tester (14), the online viscosity meter (15) and the pressure sensor (16) are respectively connected to the external PLC control box through cables; the liquid replenishing component comprises a stock liquid storage tank (19), a defoaming agent storage bottle (20), a pH adjusting agent storage bottle (21), a hard water complexing agent storage bottle (22), a bactericide storage bottle (23) and a corrosion inhibitor storage bottle (24); the stock liquid storage tank (19), the defoaming agent storage bottle (20), the pH adjusting agent storage bottle (21), the hard water complexing agent storage bottle (22), the bactericide storage bottle (23) and the corrosion inhibitor storage bottle (24) are respectively connected to the liquid distribution box (18) through connecting pipelines, and a flow pump (30) is provided on the connecting pipeline between the liquid replenishing component and the liquid distribution box (18), and the flow pump (30) is respectively connected to the external PLC control box through cables; the liquid in the liquid distribution box (18) is pumped into the tank liquid; The main pipeline of the monitoring component is provided with a deflection valve (11), and the bypass pipeline is provided with two bypass isolation valves (28), the two bypass isolation valves (28) being respectively located at the liquid inlet end and the liquid outlet end of the bypass pipeline, and the cutting fluid is transferred from the liquid storage tank (9) to the liquid distribution tank (18) by a pump; the main pipeline pressure is adjusted by the deflection valve (11), a bypass pipeline pressure difference is provided, and the circulation of the cutting fluid in the bypass pipeline is realized; the rotation speed of the butterfly centrifuge (6) is greater than 5000 r / min, and the solid impurity separation accuracy is not greater than 2 μm.

2. The integrated online purification and monitoring system for emulsified cutting fluid according to claim 1 is characterized in that: A liquid level meter (29) is provided in the stock liquid storage tank (19); a float liquid level meter (31) is provided in each of the defoamer liquid storage bottle (20), the pH adjuster liquid storage bottle (21), the hard water complexing agent liquid storage bottle (22), the bactericide liquid storage bottle (23) and the corrosion inhibitor liquid storage bottle (24); the liquid level meter (29) and the float liquid level meter (31) are respectively connected to an external PLC control box via cables.

3. The integrated online purification and monitoring system for emulsified cutting fluid according to claim 1 is characterized in that: An ozone generator (17) is also provided. The cutting fluid in the liquid storage tank (9) is sterilized by the ozone generator (17) after online monitoring and then enters the liquid distribution tank (18).

4. The integrated online purification and monitoring system for emulsified cutting fluid according to claim 1 is characterized in that: The pre-filter device (2) is a basket filter.

5. The integrated online purification and monitoring system for emulsified cutting fluid according to claim 1 is characterized in that: The air pressure in the vacuum air flotation tank (4) is adjusted to 0.02-0.04 MPa via a pressure regulating valve (3), and the pressure regulating valve (3) is connected to an external PLC control box via a cable.

6. The integrated online purification and monitoring system for emulsified cutting fluid according to claim 1 is characterized in that: The centrifugal tank of the butterfly centrifuge (6) is connected to the floating oil collection box (7) and the slag block collection box (8).

7. The integrated online purification and monitoring system for emulsified cutting fluid according to claim 1 is characterized in that: The liquid inlet (33) of the machine tool liquid tank (32) and the liquid outlet corresponding to the liquid suction float are distributed diagonally in the machine tool liquid tank (32); the liquid inlet (33) of the machine tool liquid tank (32) is connected to the liquid distribution box (18).

8. The integrated online purification and monitoring system for emulsified cutting fluid according to claim 1 is characterized in that: The defoaming agent liquid storage bottle (20) is also connected to the liquid storage box (9) via a connecting pipeline, and a flow meter and a flow pump are provided on the connecting pipeline. The flow meter and the flow pump are respectively connected to an external PLC control box via cables.

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