A cutting fluid recovery system

Abstract

The present invention relates to the technical field of cutting fluid recycling, and specifically relates to a cutting fluid recycling system, which includes a filtration tank. An inlet water pipe, an outlet water pipe, a sludge discharge port and a controller are provided on the filtration tank. The system also includes a detection device. A detection device for detecting the internal microbial environment of the filtration tank is installed on the filtration tank. An antibacterial device for cooperating with the detection device to inhibit microorganisms is installed on the filtration tank. The detection device includes a detection tube installed on the filtration tank, and a PH monitor is provided at one end of the detection tube located outside the filtration tank. The present invention measures the bacterial environment through a PH-type automatically calibrated detection device. When the PH value of the cutting fluid exceeds the set value, a gas-guided feeding antibacterial device that matches the detection device is used to destroy the environment suitable for the survival of microorganisms in the cutting fluid recycling system, including oxygen content, PH value, etc., and more comprehensively curb the survival and reproduction of microorganisms.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting fluid recovery, and particularly to a cutting fluid recovery system. Background Art

[0002] During the metal machining process, the cutting waste liquid is difficult to directly treat due to its complex composition and good chemical stability. Moreover, the toxic substances in the cutting fluid involve environmental protection issues, so the treatment cost is extremely high. Therefore, it is necessary to extend the service life of the cutting fluid through various cutting fluid recovery systems as much as possible to reduce production costs.

[0003] Cutting fluids can be divided into oil-based cutting fluids and water-based cutting fluids. According to statistics, the current usage amount of oil-based cutting fluids accounts for 20% of the total amount, and water-based cutting fluids account for 80%. Among water-based cutting fluids, emulsified cutting fluids occupy the largest share of usage. Because the emulsion contains oil and water, under the action of emulsifiers, the oil and water are blended into a uniform dispersion. Therefore, the emulsion has both the lubricity and rust prevention of oil and the excellent cooling performance of water. And its use cost is low, which is widely used in various metal cutting processes.

[0004] However, the biggest disadvantage of emulsions is their poor biological stability and rapid bacterial growth and reproduction. According to statistics, the large-scale reproduction of bacteria and microorganisms has greatly affected the recycling of cutting fluids. Once the cutting fluid is damaged by microorganisms, it can only be scrapped and cannot be recycled, shortening its service life by 65%-85%. Other methods of inhibiting microorganisms, such as heat sterilization, require a large amount of energy, and at the same time, the evaporation of water vapor will cause a large amount of surrounding equipment to corrode and rust.

[0005] The cutting fluid recovery systems of the prior art have relatively perfect solutions for filtering and recovering impurities such as solid metals and metal compounds, but there are still significant shortcomings in the detection and inhibition of microorganisms in cutting fluids. For example, the monitoring methods are costly and lagging. Since the existing pH detectors need to be frequently cleaned and calibrated, otherwise large deviations are likely to occur. The prior art mainly relies on manual sampling at regular intervals for detection. When the cutting production volume reaches the peak, the manual sampling at regular intervals will show obvious lag, and the microorganisms will reproduce too fast to damage the cutting fluid. When the cutting production volume is at the bottom, the manual sampling at regular intervals will lead to an increase in labor costs. And after detecting that the microorganisms exceed the limit, the existing measures to inhibit microorganisms still mainly rely on manually adding microbial inhibitors, which are difficult to implement timely and accurately according to the detection results.

[0006] Therefore, a cutting fluid recovery system is proposed. Summary of the Invention

[0007] The purpose of the present invention is to provide a cutting fluid recovery system. A detection device with automatic PH calibration is used to measure the bacterial environment. When the PH value of the cutting fluid exceeds the set value, a gas-guided feeding antibacterial device that matches the detection device is used to destroy the environment suitable for the survival of microorganisms in the cutting fluid recovery system, including oxygen content, PH value, etc., to more comprehensively curb the survival and reproduction of microorganisms and solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A cutting fluid recovery system includes a filtration tank. The filtration tank is provided with a water inlet pipe, a water outlet pipe, a sludge discharge port and a controller. It also includes a detection device. A detection device for detecting the internal microbial environment of the filtration tank is installed on the filtration tank. An antibacterial device for suppressing microorganisms in cooperation with the detection device is installed on the filtration tank. The detection device includes a detection tube installed on the filtration tank. The detection tube penetrates the filtration tank. A PH monitor is provided at one end of the detection tube outside the filtration tank. The detection probe of the PH monitor is located inside the detection tube. A discharge valve is provided at the end of the detection tube far from the filtration tank. A valve I is provided between the PH monitor on the detection tube and the filtration tank. The detection tube is located on the horizontal equal division plane of the volume of the filtration tank.

[0010] The types of microorganisms in water-based cutting fluid include bacteria and fungi. The main bacteria are Escherichia coli, Streptococcus pneumoniae, Proteus, Pseudomonas, Salmonella, Staphylococcus, etc. The fungi are mainly molds and yeasts. Under suitable conditions, these microorganisms divide once every 20 - 30 minutes and can grow in geometric progression. The environmental parameters affecting the survival and reproduction of microorganisms include the content of nutrients, oxygen content, temperature and PH value in the cutting fluid. Considering cost and cutting performance, the content of nutrients in the cutting fluid is mainly related to the type of cutting fluid. To ensure cutting performance, it is difficult to adjust it. Adjusting the temperature of the cutting fluid storage environment has a high energy consumption cost because it requires a high temperature of 100 degrees Celsius to instantly kill microorganisms, or the cutting fluid is continuously stored under a constant temperature condition of more than 55 degrees Celsius. The use costs of the above two solutions are both relatively high, and reliable heating equipment and heat preservation equipment need to be added to the cutting fluid circulation system, which is also not conducive to the upgrade and transformation of existing equipment.

[0011] At the same time, raising the temperature of the cutting fluid will cause a sharp increase in the water vapor evaporation rate and cause a large amount of surrounding equipment to corrode and rust.

[0012] When the PH value of the cutting fluid is low, microorganisms are prone to divide and reproduce. At the same time, a large number of microbial metabolites will further exacerbate the decline of the PH value in the cutting fluid. Therefore, detecting the PH value of the cutting fluid can indirectly detect the microbial reproduction situation and the reproduction environment situation in the cutting fluid.

[0013] The detection device needs to be installed on the container for storing cutting fluid in the cutting fluid recovery system, which can be a filter tank with a filtering function or other containers for storing cutting fluid.

[0014] Since solid impurities that are not completely filtered are likely to accumulate at the bottom layer of the cutting fluid inside the filter tank, and foam or suspended biofilms are likely to form on the top layer of the cutting fluid inside the filter tank. Whether it is solid impurities, foam or biofilms, they will all affect the detection results of the pH monitor. Therefore, a detection tube for sampling is set on the horizontal equal division plane of the volume of the filter tank, which can reduce the detection error of the pH monitor. By setting the cooperation of the discharge valve and valve 1, intermittent detection and continuous monitoring can be achieved. For example, continuously opening valve 1 and closing the discharge valve can enable the detection probe of the pH monitor to be always connected to the cutting fluid in the filter tank through the detection tube, so as to achieve continuous monitoring. Another example is that from the perspective of energy conservation and the reliability of detection data, when intermittent detection is required, the discharge valve and valve 1 are opened simultaneously to let a part of the cutting fluid flow out through the detection tube, and then they are closed simultaneously. At this time, the cutting fluid remaining inside the detection tube is completely in an independent and isolated state. After the cutting fluid inside the detection tube stabilizes, the pH monitor can obtain relatively accurate detection results.

[0015] Preferably, a cleaning tube for zeroing the detection probe is provided between valve 1 and the pH monitor on the detection tube. The cleaning tube is connected to an external pure water source. A valve 2 is provided on the cleaning tube. The detection tube is a zigzag tube, and the non-horizontal section of the detection tube is connected to the filter tank and the non-connected horizontal section is placed horizontally. The detection probe of the pH monitor is vertically placed on the horizontal section of the detection tube. The cleaning tube is located below the non-horizontal section of the detection tube and is symmetrically arranged with the non-horizontal section of the detection tube.

[0016] The detection probe of the pH monitor needs to be frequently rinsed with pure water to zero, and the detection probe is placed vertically to ensure the accuracy of the detection effect. By setting the cooperation of the discharge valve, valve 1 and valve 2, zeroing of the detection probe can be achieved, that is, closing valve 1 and opening the discharge valve and valve 2, so that the pure water in the cleaning tube can rinse the detection probe. The layout that the cleaning tube is located below the non-horizontal section of the detection tube and is symmetrically arranged with the non-horizontal section of the detection tube can enable the sediment or suspended substances that may exist in the detection tube to be taken out together when the cleaning tube rinses the detection probe. At the same time, the cleaning tube and the detection tube can be connected using a standard Y-shaped pipe splitter, which can save equipment costs without affecting the overall transmission performance.

[0017] At the same time, closing the discharge valve and only opening valve 1 and valve 2 can allow pure water to enter and combine with the cutting fluid to make up water and dilute it when the concentration of the cutting fluid is too high due to the evaporation of water.

[0018] The antibacterial device includes a jet pipe vertically inserted into the interior of the filter tank. An air pump is installed at one end of the jet pipe away from the filter tank. A branch pipe is provided at the position of the jet pipe at the top of the filter tank. A powder feeder for dispensing antibacterial materials or alkaline materials is provided at one end of the branch pipe away from the jet pipe. The powder feeder is electrically connected to a pH monitor.

[0019] When the pH value changes from <7.5 to >8.5, the concentration of microorganisms will be reduced by more than 90%. When the pH value is 9.0 - 9.5, the reproduction of microorganisms is relatively slow and the liquid is not easily deteriorated. If the pH value is too high, the corrosion of the liquid to metals will increase. If the pH value is too low, microorganisms are likely to breed, and at the same time, it will cause metal rust. Therefore, the recommended pH values are generally 7.5 - 8.5 for the emulsion used in processing aluminum and zinc alloys, and 8.5 - 9.5 for processing steel materials.

[0020] When the air pump is started, compressed air enters the filter tank through the jet pipe, destroying the living environment of anaerobic bacteria in the cutting fluid in the filter tank. At the same time, the powder feeder dispenses powdery antibacterial materials or alkaline materials for improving the pH value into the branch pipe, and sucks the powdery materials on the branch pipe into the cutting fluid in the filter tank by the principle of fast flow rate and low pressure, enabling the powder to be mixed with the cutting fluid more evenly and efficiently.

[0021] The powder feeder can adopt the feed feeding device in the breeding industry for timed and quantitative feeding, or can also feed according to the set program based on the detection results of the controller and the pH monitor. The antibacterial materials can be o-phenylphenol, tetrachlorophenol, parachlorometaxylenol, etc. Using them in combination or alternately can reduce the drug resistance generated by microorganisms. The alkaline materials for improving the pH value can select pH regulators such as sodium bicarbonate, sodium carbonate or slaked lime powder.

[0022] Preferably, a plurality of shunt pipes for guiding air are connected to the bottom of the jet pipe. The shunt pipes are arranged in multiple layers with different heights. A circular nozzle is opened at one end of each shunt pipe away from the jet pipe. The shape of the shunt pipe is an arc centered on the jet pipe, and the nozzle spaces of the shunt pipes at different heights are staggered.

[0023] The shunt pipes arranged in multiple layers and staggered can make the air and materials entering the filter tank through the jet pipe contact and exchange with the cutting fluid more comprehensively and evenly. The arc-shaped shunt pipes can make the cutting fluid in the filter tank rotate, which not only improves the efficiency of material exchange but also can quickly increase the oxygen content in the cutting fluid to inhibit anaerobic bacteria that are likely to produce malodor. Since the proportion of anaerobic bacteria in the cutting fluid is much larger than that of aerobic bacteria, inhibiting anaerobic bacteria can greatly extend the life of the cutting fluid. At the same time, the rotation of the cutting fluid can make the sampling of the pH monitor more universal and representative, that is, the detected pH result is closer to the objective fact.

[0024] Preferably, each of the nozzles except the lowest one is arranged to incline upward by 15 to 30 degrees in the vertical plane. A circular cover plate is rotatably mounted on each of the nozzles of the shunt pipe through a torsion spring shaft, and a washer for reducing the gap between the cover plate and the nozzle of the shunt pipe is provided on the circular cover plate. The inner bottom wall of the jet pipe is inclined, and a nozzle inclined downward by 15 to 30 degrees is arranged at the lowest position of the inclined surface.

[0025] When the nozzles are arranged to incline upward by 15 to 30 degrees in the vertical plane, when the jet pipe sprays air into the cutting fluid, the cutting fluid can form an upward rotating spiral eddy under the cooperation of air. The cutting fluid is violently rotated and stirred, and can be in full contact with air, stirring and dispersing the bottom sediment and the top suspended matter. Since both the bottom sediment and the top suspended matter are beneficial environments for the reproduction of microorganisms, stirring and dispersing the bottom sediment and the top suspended matter can further curb the living environment of microorganisms in the cutting fluid. The circular cover plate rotatably mounted through the torsion spring shaft can close the nozzle under the action of the torsion spring when the jet pipe does not spray air into the cutting fluid, reducing the entry of sediment into the jet pipe through the shunt pipe, thereby reducing the formation of solid blockages caused by the reproduction of microorganisms in the sediment to block the jet pipe and the nozzles of the shunt pipe. The inner bottom wall of the jet pipe is inclined, and a nozzle inclined downward by 15 to 30 degrees is arranged at the lowest position of the inclined surface, so that a small amount of sediment entering the jet pipe can be completely discharged by the shunt pipe at the lowest position during the next air guiding of the jet pipe. Compared with other upward inclined shunt pipes, the downward inclination of the shunt pipe at the lowest position can ensure the maximum spraying pressure. Since the sediment is located at the lowest position in the jet pipe, this setting can further avoid the blockage of the shunt pipe at the lowest position.

[0026] Preferably, the material of the jet pipe or the shunt pipe is stainless steel. Similarly, aluminum alloy, copper alloy or other corrosion-resistant and high-strength resin materials can also be used. Considering the comprehensive material performance, use cost and maturity of parts supply, stainless steel has relatively greater advantages.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. By cooperating with the opening and closing of the first valve and the discharge valve, the real-time monitoring of the pH value of the cutting fluid can be realized, the living environment of microorganisms in the cutting fluid can be detected more stably and continuously, and the intermittent detection of the pH value of the cutting fluid can also be realized. The detection result is more accurate and reliable, and the probe of the detection equipment does not need to be immersed in the cutting fluid all the time, and the probability of probe damage can also be reduced, improving the flexibility of the equipment detection means as a whole.

[0029] 2. By setting the cooperation of the discharge valve, valve 1 and valve 2, zeroing of the detection probe can be achieved. That is, by closing valve 1 and opening the discharge valve and valve 2, the pure water in the cleaning pipe can be used to flush the detection probe of the PH monitor, thereby ensuring the accuracy of the detection effect. At the same time, by closing the discharge valve and only opening valve 1 and valve 2, pure water can enter the filtration tank and be combined with the cutting fluid to make up water and dilute it when the concentration of the cutting fluid becomes too high due to the evaporation of water.

[0030] 3. By compressing air with an air pump, the compressed air enters the filtration tank through the jet pipe, which can destroy the living environment of anaerobic bacteria in the cutting fluid in the filtration tank. At the same time, the powder feeder puts powdery antibacterial materials or alkaline materials for improving the PH value into the branch pipe, and the powdery materials on the branch pipe are inhaled and sprayed into the cutting fluid in the filtration tank through the principle of fast flow rate and low pressure, enabling the powder to be mixed with the cutting fluid more evenly and efficiently. Brief Description of the Drawings

[0031] Figure 1 is the structural schematic diagram of the present invention;

[0032] Figure 2 is the top view of the present invention;

[0033] Figure 3 is Figure 2 the sectional view taken along A-A of

[0034] Figure 4 is the structural schematic diagram of the jet pipe and the shunt pipe of the present invention;

[0035] Figure 5 is Figure 4 the enlarged view of part B of

[0036] In the figure: 1. Filtration tank; 2. Water inlet pipe; 3. Water outlet pipe; 4. Silt discharge port; 5. Detection pipe; 6. PH monitor; 7. Discharge valve; 8. Valve 1; 9. Cleaning pipe; 10. Valve 2; 11. Jet pipe; 12. Branch pipe; 13. Powder feeder; 14. Shunt pipe; 15. Cover plate. Detailed Embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described below are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0038] Please refer to Figures 1 to 5 , as the first embodiment of the present invention:

[0039] Production conditions: High-frequency production, rapid recycling of cutting fluid, and a large amount of external grease and impurities mixed into the cutting fluid.

[0040] Equipment conditions: Keep valve 1 open continuously while closing drain valve 7, and the PH monitor 6 monitors continuously.

[0041] Install the equipment as Figures 1 to 5 shown. The used cutting fluid enters the filter tank 1 from the water inlet pipe 2 and is discharged from the water outlet pipe 3 after being filtered by the filter tank 1.

[0042] Under normal operating conditions, the PH value of the cutting fluid needs to be maintained between 8.0 and 9.0 to better balance rust prevention, lubrication, and inhibition of microorganisms. Since valve 1 is kept open continuously while drain valve 7 is closed, the PH monitor 6 is in a continuous monitoring state. During high-frequency production, the cutting fluid is recycled relatively quickly, and the cutting fluid in the filter tank 1 is in a flowing state as a whole. The PH monitor 6 can obtain relatively average values. When the PH monitor 6 detects that the PH in the cutting fluid drops to the set lower limit value, the PH monitor 6 sends a signal to the controller, and the controller controls the air pump to start. The air pump discharges compressed air into the jet pipe 11, and the air flows out from the shunt pipe 14 of the jet pipe 11. When the air flows out from the shunt pipe 14, the air flow will push open the cover plate 15 under the action of the torsion spring shaft, so that the compressed air can enter the filter tank 1 from the nozzle. Since each of the nozzles except the lowest position is arranged at an angle of 15 to 30 degrees upward in the vertical plane, when the jet pipe 11 sprays air into the cutting fluid, the cutting fluid, with the cooperation of the air, forms an upward rotating spiral eddy current. The cutting fluid is violently rotated and stirred, enabling it to come into full contact with the air, and stirring and dispersing the bottom sediment and top suspended matter to destroy the breeding environment of microorganisms.

[0043] Due to the multi-layer staggered arrangement of the shunt pipes 14, the air and materials entering the filter tank 1 come into more comprehensive and uniform contact and exchange with the cutting fluid. At the same time, the controller controls the powder feeder 13 to put powdery antibacterial materials or alkaline materials for improving the PH value into the branch pipe 12, and inhales the powdery materials on the branch pipe 12 into the jet pipe through the principle of fast flow rate and low pressure. The air mixed with the powder materials is sprayed into the cutting fluid in the filter tank 1. Since the arc-shaped shunt pipe 14 can stir up the cutting fluid in the filter tank 1, the efficiency of material and cutting fluid exchange is relatively high at this time. After the materials are completely dissolved and mixed with the cutting fluid, the controller turns off the air pump, then the shunt pipe 14 no longer ejects air flow, and the cover plate 15 rotates under the action of the torsion spring shaft to cover the nozzle, preventing sediment from entering the shunt pipe 14, thereby reducing the formation of solid blockages by microorganisms breeding in the sediment to block the nozzles of the jet pipe 11 and the shunt pipe 14. Even if a small amount of sediment enters the jet pipe 11, these sediments can be completely discharged by the lowest-position shunt pipe 14 during the next air conduction of the jet pipe 11.

[0044] At this time, the alkaline material raises the pH value of the cutting fluid to ensure that the cutting fluid is in a state of inhibiting microorganisms. The antibacterial material eliminates most of the microorganisms and keeps the cutting fluid in an antibacterial state for a long time. On the other hand, the increase in the pH value of the cutting fluid can ensure the rust prevention performance of the cutting fluid.

[0045] Subsequently, the controller closes valve 8, opens drain valve 7 and valve 10, discharges the remaining cutting fluid in the detection tube 5, and simultaneously rinses and zeros the detection probe of the pH monitor 6 with pure water. After rinsing and zeroing, valve 10 is immediately closed, and valve 8 is opened. At this time, the cutting fluid in the filtration tank 1 flows out, taking the pure water that has been rinsed and zeroed in the detection tube 5 out of the detection tube 5. Subsequently, the controller closes drain valve 7. At this time, the detection probe of the pH monitor 6 is always connected to the cutting fluid in the filtration tank 1 through the detection tube 5. Thus, the detection device and the antibacterial device jointly and coordinately complete an operation and re-enter the detection cycle.

[0046] As the second embodiment of the present invention:

[0047] Production conditions: low-frequency production or long-term static storage state.

[0048] Equipment conditions: Continuously close valve 8 and drain valve 7, open them when detection is required, and the pH monitor 6 monitors intermittently.

[0049] Since the reproduction and division of microorganisms have periodic regularity, they can reproduce rapidly in a suitable environment, and the overall quantity increases according to a quadratic function. The reproduction rate is slower in an unsuitable environment. Therefore, it is more suitable to adopt an intermittent detection method with higher precision and lower energy consumption.

[0050] In the state of low-frequency production or long-term static storage, the cutting fluid circulates slowly. Even if the cutting fluid in the filtration tank 1 is in a static or low-speed motion state as a whole, since the detection tube 5 for sampling is located on the horizontal equal division plane of the volume of the filtration tank 1, it can reduce the influence of solid impurities at the bottom layer, floating foam or suspended biofilm at the top layer of the cutting fluid on the detection result, and the pH monitor 6 can obtain a relatively average value of the cutting fluid.

[0051] Close valve two 10, and at the same time open drain valve 7 and valve one 8 to allow a part of the cutting fluid to flow out through the detection tube 5, and then close them simultaneously. At this time, the cutting fluid remaining inside the detection tube 5 is completely in an independent and isolated state. After the cutting fluid inside the detection tube 5 stabilizes, the PH monitor 6 can obtain a relatively accurate detection result. Subsequently, the controller controls the opening of drain valve 7 and valve two 10 to discharge the remaining cutting fluid in the detection tube 5, and at the same time, the detection probe of the PH monitor 6 is rinsed with pure water to zero. After rinsing to zero, first close valve two 10 and then close drain valve 7. At this time, the detection probe of the PH monitor 6 is in an environment where it is not immersed in any liquid, and it can always provide a relatively accurate detection result when the next detection is carried out.

[0052] When the PH monitor 6 detects that the PH in the cutting fluid drops to the set lower limit value, the function of the antibacterial device operates in the same manner as in Embodiment 1, and will not be elaborated here.

[0053] It is worth mentioning that, based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

Claims

1. A cutting fluid recovery system, comprising: A filter tank (1), on which a water inlet pipe (2), a water outlet pipe (3), a sludge discharge port (4) and a controller are provided; Characterized in that it further comprises: A detection device, and a detection device for detecting the internal microbial environment of the filter tank (1) is installed on the filter tank (1); An antibacterial device, and an antibacterial device for cooperating with the detection device to inhibit microorganisms is installed on the filter tank (1); The detection device includes a detection tube (5) installed on the filter tank (1), the detection tube (5) penetrates the filter tank (1), a pH monitor (6) is provided at one end of the detection tube (5) outside the filter tank (1), the detection probe of the pH monitor (6) is located inside the detection tube (5), a discharge valve (7) is provided at the end of the detection tube (5) far from the filter tank (1), a valve one (8) is provided between the pH monitor (6) and the filter tank (1) on the detection tube (5), the detection tube (5) is located on the horizontal equal division plane of the volume of the filter tank (1), and both the valve one (8) and the discharge valve (7) are electrically connected to the controller; A cleaning tube (9) for calibrating the detection probe is provided between the valve one (8) and the pH monitor (6) on the detection tube (5), the cleaning tube (9) is communicated with an external pure water source, a valve two (10) is provided on the cleaning tube (9), and both the pH monitor (6) and the valve two (10) are electrically connected to the controller; The detection tube (5) is a folded tube, and the non-horizontal section of the detection tube (5) is communicated with the filter tank (1), the other section of the detection tube (5) that is not connected to the filter tank (1) is horizontally placed, the detection probe of the pH monitor (6) is vertically placed on the horizontal section of the detection tube (5), and the cleaning tube (9) is located below the non-horizontal section of the detection tube (5) and is symmetrically arranged with the non-horizontal section of the detection tube (5); The antibacterial device includes a jet tube (11) vertically inserted into the filter tank (1), an air pump is installed at one end of the jet tube (11) far from the filter tank (1), a branch tube (12) is provided at the position of the jet tube (11) at the top of the filter tank (1), a powder feeder (13) for feeding antibacterial materials or improving the pH value environment of the cutting fluid is provided at one end of the branch tube (12) far from the jet tube (11), the powder feeder (13) is electrically connected to the pH monitor (6), and the air pump is electrically connected to the controller; A plurality of shunt tubes (14) for guiding air are communicated at the bottom of the jet tube (11), the shunt tubes (14) are arranged in multiple layers with different heights, and a nozzle is provided at one end of each shunt tube (14) far from the jet tube (11); The shunt tube (14) is in the shape of an arc centered on the jet tube (11), and the nozzles of the shunt tubes (14) at different heights are arranged with staggered spaces; Except for the nozzles at the lowest position, each of the nozzles is arranged to incline upward by 15 to 30 degrees in the vertical plane, the inner bottom wall of the jet tube (11) is inclined, and a nozzle inclined downward by 15 to 30 degrees is arranged at the lowest position of the inclined plane.

2. The cutting fluid recovery system according to claim 1, wherein: A circular cover plate (15) is rotatably mounted on the nozzle of each shunt pipe (14) through a torsion spring shaft, and a washer for reducing the gap between the cover plate (15) and the nozzle of the shunt pipe (14) is provided on the circular cover plate (15).

3. The cutting fluid recovery system according to claim 1, wherein: The jet pipe (11) or the shunt pipe (14) is made of stainless steel.

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