On-line cooling liquid purification device for machining

Abstract

The utility model relates to an on-line cooling liquid purification device for machining. The on-line cooling liquid purification device comprises a stock solution bin for containing to-be-treated cooling liquid, a feeding pump, a silicon carbide ceramic membrane assembly, a backwashing pump and a liquid storage tank, a liquid inlet regulating valve, a liquid inlet pneumatic valve and a liquid inlet pressure gauge are sequentially mounted between communicating pipelines of the silicon carbide ceramic membrane component and the feeding pump; the silicon carbide ceramic membrane assembly comprises a shell, the top of the shell is communicated with a liquid inlet, the side wall of the shell is connected with a clean liquid outlet, and the bottom of the shell is communicated with a drain outlet; the top of the stock solution bin communicates with a drain outlet, and the bottom of the stock solution bin communicates with a feeding pump; an outlet of the feeding pump is communicated with the liquid inlet; and the clean liquid outlet is respectively communicated with a liquid storage tank and a backwashing pump. According to the utility model, the cooling liquid used by the machining equipment is continuously purified under the condition that the machining equipment is not stopped, and the filter membrane can be repeatedly and circularly used after being backwashed, so that the filtering and purifying cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of membrane filtration, in particular to an on-line purification device for coolant used in machining. Background Art

[0002] In the machining industry, when performing operations such as wire cutting, turning, drilling, grinding, etc., in order to reduce the machining temperature, reduce the wear and thermal deformation of cutting tools, coolant is often added to ensure machining efficiency and product quality. During the use of the coolant, it will be contaminated by various pollutants, including fine chips, dust, oil stains, etc. of the machined material. After the uncleaned coolant enters the circulation system, not only the cooling efficiency is reduced, but it may also contaminate other equipment. Therefore, the coolant needs to be replaced regularly after being used for a period of time.

[0003] In order to extend the service life of the coolant and improve the oil change cycle of the cold replenishing liquid, it is necessary to process the contaminated coolant through a filtering device to remove pollutants such as fine chips, dust, and oil stains contained in the coolant, so that the coolant can restore its functions of cooling, lubricating, and decontaminating. Therefore, developing an on-line purification equipment for coolant used in the machining industry plays an important role in extending the service life of the coolant, reducing production costs, and ensuring product quality.

[0004] During the use of the existing coolant, bag filters are used for on-line purification and filtration, which can only remove large particles therein, cannot completely purify the coolant, and the filter bags need to be frequently replaced. Not only is the treatment effect poor, but the operating cost is also increased. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an on-line purification device for coolant used in machining, which can effectively remove pollutants such as fine chips, dust, and oil stains in the used coolant, and the coolant index after treatment reaches the new coolant standard. The filter membrane can also be repeatedly used through backwashing.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model relates to an on-line purification device for coolant in machining, which comprises a stock solution tank, a feeding pump, a silicon carbide ceramic membrane module and a liquid storage tank; the silicon carbide ceramic membrane module comprises a shell, and a silicon carbide ceramic membrane is arranged inside the shell; a liquid inlet of the membrane module is communicated and arranged at the top of the shell, a purified liquid outlet is connected and arranged on the side wall of the shell, a backwashing inlet is connected to the middle of the side wall of the shell, and a sewage outlet is communicated and arranged at the bottom of the shell; the inlet end of the feeding pump is communicated with the stock solution tank, the outlet end of the feeding pump is communicated with the liquid inlet of the membrane module, and a liquid inlet regulating valve and a liquid inlet pressure gauge are sequentially installed between the connecting pipeline of the silicon carbide ceramic membrane module and the feeding pump; the purified liquid outlet is communicated with a liquid production port, and a liquid production pressure gauge, a liquid production pneumatic valve and a liquid production flowmeter are sequentially communicated between the purified liquid outlet and the liquid production port; the liquid storage tank is provided with a backwashing air inlet, a liquid storage tank liquid inlet, a pressure relief port and a first backwashing outlet, the backwashing inlet is communicated with the first backwashing outlet, and a backwashing pneumatic valve, a backwashing pressure gauge and a backwashing pump are sequentially communicated between the backwashing inlet and the first backwashing outlet; backwashing pneumatic valves are communicated between the liquid storage tank and the pressure relief port and between the liquid storage tank liquid inlet and the liquid production port; the backwashing air inlet is communicated with an air storage tank or an air source; the air storage tank is communicated with an air compressor.

[0008] In the above on-line purification device for coolant in machining, the silicon carbide ceramic membrane module comprises a first silicon carbide ceramic membrane module and a second silicon carbide ceramic membrane module; a first liquid production pressure gauge and a first liquid production pneumatic valve are installed at the liquid outlet of the first silicon carbide ceramic membrane module, a second liquid production pressure gauge and a second liquid production pneumatic valve are installed at the liquid outlet of the second silicon carbide ceramic membrane module, and a third liquid production pneumatic valve and a liquid production flowmeter are sequentially communicated between the liquid outlet of the first silicon carbide ceramic membrane module and the liquid outlet of the second silicon carbide ceramic membrane module and the liquid production port; first backwashing pneumatic valves and second backwashing pneumatic valves are installed at the backwashing inlets of the first silicon carbide ceramic membrane module and the second silicon carbide ceramic membrane module; a backwashing pressure gauge, a third backwashing pneumatic valve and a backwashing pump are sequentially arranged between the first backwashing pneumatic valve, the second backwashing pneumatic valve and the first backwashing outlet; the liquid storage tank is further provided with a second backwashing outlet, and a fourth backwashing pneumatic valve is connected between the second backwashing outlet and the backwashing pressure gauge; a fifth backwashing pneumatic valve is installed at the pressure relief port; the liquid storage tank liquid inlet is communicated with the third liquid production pneumatic valve, and a sixth backwashing pneumatic valve is communicated between the liquid storage tank liquid inlet and the third liquid production pneumatic valve; a seventh backwashing pneumatic valve is communicated between the backwashing air inlet and the air storage tank.

[0009] In the above on-line purification device for coolant in machining, a liquid inlet thermometer is further installed between the connecting pipelines of the liquid inlet regulating valve and the liquid inlet pressure gauge, and the liquid inlet thermometer is used for measuring and displaying the liquid inlet temperature.

[0010] In the above on-line purification device for coolant in machining, a fixing frame is installed outside the shell, and the fixing frame comprises a clamp and a support seat. The clamp is fixedly sleeved on the outer peripheral side of the shell, and the support seat is fixedly arranged at the bottom of the clamp.

[0011] In the above-mentioned on-line purification device for the coolant used in machining, a liquid level gauge is inlaid on the outer peripheral wall of the front of the liquid storage tank, and an installation bracket is fixedly arranged at the bottom of the liquid storage tank.

[0012] The beneficial effects of the present utility model are as follows:

[0013] The filter membrane is a silicon carbide ceramic membrane, which is fired at high temperature. The filter membrane has an asymmetric structure and has the advantages of large flux, high precision, high strength, acid corrosion resistance, long service life, etc.

[0014] The filtration process adopts a dead-end filtration process. The device has the advantages of small floor area, low energy consumption, acid corrosion resistance, etc., and does not require additional manpower during the production process, and has an automatic backwashing function to ensure high filtration efficiency of the equipment.

[0015] Two membrane modules are installed in the device. When one module needs to be backwashed due to fouling, the other membrane module is started. After the filter membrane is backwashed, its filtration performance is restored. The two groups of silicon carbide ceramic membrane modules can be used alternately to continuously purify the used coolant without stopping the machine, greatly reducing the filtration and purification cost. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the present utility model adopting a single group of silicon carbide ceramic membrane modules and using liquid backwashing;

[0017] Figure 2 It is a schematic structural diagram of the present utility model adopting a single group of silicon carbide ceramic membrane modules and using gas backwashing;

[0018] Figure 3 It is a schematic structural diagram of the present utility model adopting two groups of silicon carbide ceramic membrane modules combined with gas-liquid backwashing;

[0019] Figure 4 It is a schematic structural diagram of the silicon carbide ceramic membrane module of the present utility model;

[0020] Figure 5 It is a schematic structural diagram of the liquid storage tank of the present utility model.

[0021] In the figure: 1 - stock solution tank; 2 - feed pump; 3 - inlet liquid regulating valve; 4 - inlet liquid thermometer; 5 - inlet liquid pressure gauge; 601 - first inlet liquid pneumatic valve; 602 - second inlet liquid pneumatic valve; 701 - first silicon carbide ceramic membrane module; 702 - second silicon carbide ceramic membrane module; 71 - outer shell; 711 - membrane module inlet; 712 - purified liquid outlet; 713 - sewage outlet; 714 - backwash inlet; 72 - fixing rack; 721 - clamp; 722 - support seat; 801 - first sewage pneumatic valve; 802 - second sewage pneumatic valve; 901 - first sewage outlet; 902 - second sewage outlet; 101 - first product liquid pressure gauge; 102 - second product liquid pressure gauge; 111 - first backwash pneumatic valve; 112 - second backwash pneumatic valve; 113 - third backwash pneumatic valve; 114 - fourth backwash pneumatic valve; 115 - fifth backwash pneumatic valve; 116 - sixth backwash pneumatic valve; 117 - seventh backwash pneumatic valve; 12 - backwash pressure gauge; 13 - backwash pump; 14 - liquid storage tank; 141 - liquid level gauge; 142 - mounting bracket; 143 - backwash air inlet; 144 - liquid storage tank inlet; 145 - pressure relief port; 146 - first backwash outlet; 147 - second backwash outlet; 15 - air storage tank; 16

[0022] - air compressor; 17 - pressure relief port; 181 - first product liquid pneumatic valve; 182 - second product liquid pneumatic valve; 183 - third product liquid pneumatic valve; 19 - product liquid flowmeter; 20 - product liquid outlet. Specific embodiments

[0023] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0024] Embodiment 1

[0025] Reference Figure 1 、 Figure 4 And Figure 5, this embodiment provides an on-line purification device for coolant used in machining, which includes a stock solution tank 1, a feed pump 2, a silicon carbide ceramic membrane module, and a liquid storage tank 14; the silicon carbide ceramic membrane module includes a housing 71, and a silicon carbide ceramic membrane is arranged inside the housing 71; a liquid inlet 711 of the membrane module is connected and communicated at the top of the housing 71, a purified liquid outlet 712 is connected and arranged on the side wall of the housing 71, a backwashing inlet 714 is connected to the middle of the side wall of the housing 71, and a sewage discharge port 713 is connected and communicated at the bottom of the housing 71; the inlet end of the feed pump 2 is connected and communicated with the stock solution tank 1, the outlet end of the feed pump 2 is connected and communicated with the liquid inlet 711 of the membrane module, and a liquid inlet regulating valve 3 and a liquid inlet pressure gauge 5 are sequentially installed between the connecting pipeline of the silicon carbide ceramic membrane module and the feed pump 2; the purified liquid outlet 712 is connected and communicated with a liquid production port 20, and a liquid production pressure gauge, a liquid production pneumatic valve, and a liquid production flowmeter 19 are sequentially connected and communicated between the purified liquid outlet 712 and the liquid production port 20; the liquid storage tank 14 is provided with a backwashing air inlet 143, a liquid storage tank liquid inlet 144, a pressure relief port 145, and a first backwashing outlet 146, the backwashing inlet 714 is connected and communicated with the first backwashing outlet 146, and a backwashing pneumatic valve, a backwashing pressure gauge 12, and a backwashing pump 13 are sequentially connected and communicated between the backwashing inlet 714 and the first backwashing outlet 146; backwashing pneumatic valves are connected and communicated between the liquid storage tank 14 and the pressure relief port 145, and between the liquid storage tank liquid inlet 144 and the liquid production port 20. This embodiment adopts liquid backwashing. The backwashing pump 13 reversely pumps the purified coolant back into the silicon carbide ceramic membrane module for backwashing, and the sewage after washing is discharged from the sewage discharge port of the silicon carbide ceramic membrane module.

[0026] Embodiment Two

[0027] Reference Figure 2 , the difference between another embodiment of the present utility model and the embodiment lies in that the backwashing pump 13 is removed, that is, gas backwashing is used instead of liquid backwashing. The specific structure is that the backwashing air inlet 143 is connected and communicated with a gas storage tank 15 or a gas source; the gas storage tank 15 is connected and communicated with an air compressor 16. Compressed air rushes into the silicon carbide ceramic membrane module, thereby performing backwashing, and the dirt after washing is discharged from the sewage discharge port of the silicon carbide ceramic membrane module.

[0028] Embodiment Three

[0029] Reference Figure 3, this embodiment also provides a third on-line purification device for coolant used in machining. The silicon carbide ceramic membrane module includes a first silicon carbide ceramic membrane module 701 and a second silicon carbide ceramic membrane module 702. A first product liquid pressure gauge 101 and a first product liquid pneumatic valve 181 are installed at the liquid outlet of the first silicon carbide ceramic membrane module 701. A second product liquid pressure gauge 102 and a second product liquid pneumatic valve 182 are installed at the liquid outlet of the second silicon carbide ceramic membrane module 702. A third product liquid pneumatic valve 183 and a product liquid flowmeter 19 are sequentially connected between the liquid outlets of the first silicon carbide ceramic membrane module 701 and the second silicon carbide ceramic membrane module 702 and the product liquid port 20. First reverse flush pneumatic valves 111 and second reverse flush pneumatic valves 112 are installed at the reverse flush inlets of the first silicon carbide ceramic membrane module 701 and the second silicon carbide ceramic membrane module 702. A reverse flush pressure gauge 12, a third reverse flush pneumatic valve 113 and a reverse flush pump 13 are sequentially arranged between the first reverse flush pneumatic valves 111, the second reverse flush pneumatic valves 112 and the first reverse flush outlet 146. The liquid storage tank 14 is also provided with a second reverse flush outlet 147, and a fourth reverse flush pneumatic valve 114 is connected between the second reverse flush outlet 147 and the reverse flush pressure gauge 12. A fifth reverse flush pneumatic valve 115 is installed at the pressure relief port 145. The liquid inlet of the liquid storage tank 14 is communicated with the third product liquid pneumatic valve 183, and a sixth reverse flush pneumatic valve 116 is communicated between the liquid inlet of the liquid storage tank 14 and the third product liquid pneumatic valve 183. A seventh reverse flush pneumatic valve 117 is communicated between the reverse flush air inlet 143 and the air storage tank 14.

[0030] This embodiment combines two reverse flush methods, namely liquid reverse flush and gas reverse flush. Any one of the methods can be selected for reverse flush according to actual needs. Two silicon carbide ceramic membrane modules are installed. When one module is fouled and needs to be reverse flushed, the other membrane module is started. After the filter membrane is reverse flushed, its filtering performance is restored. The two silicon carbide ceramic membrane modules can be used alternately to continuously purify the used coolant without stopping the machine.

[0031] In the above embodiment, the head of the feeding pump 2 is 10m - 40m. The raw water is pressurized by the feeding pump and then enters the first silicon carbide ceramic membrane module 701 and the second silicon carbide ceramic membrane module 702 with a pressure of 0.22 bar, which is displayed by the inlet liquid pressure gauge 5. Both the first silicon carbide ceramic membrane module 701 and the second silicon carbide ceramic membrane module 702 are provided with 168 silicon carbide ceramic membranes. The pore diameters of the used silicon carbide ceramic membranes are all 100 nm, and the membrane areas of the silicon carbide ceramic membrane modules are all 94㎡.

[0032] Before the system works, ensure that all start valves are in the closed state. Open the first liquid inlet pneumatic valve 601, the first liquid production pneumatic valve 181, and the third liquid production pneumatic valve 183 in sequence. Then turn on the feed pump 2. The coolant to be processed flows from the stock solution tank 1 into the feed pump 2, and after the pressure is increased, it enters the first silicon carbide ceramic membrane module 701 in sequence. The stock solution is filtered and purified by the silicon carbide ceramic membrane module. The filtered and purified coolant is output through the liquid production port 20. The liquid production flow rate is kept constant at 130 m 3 / h, and the flow rate is displayed by the liquid production flowmeter 19.

[0033] To ensure the continuous operation of the equipment, when the pollutants are enriched to a certain amount on the filtration surface of the first silicon carbide ceramic membrane module 701, that is, when the difference between the readings of the inlet liquid pressure gauge 5 and the first liquid production water pressure gauge 101 is greater than 1 bar, open the second liquid inlet pneumatic valve 602 and the second liquid production pneumatic valve 182 in sequence, and close the first liquid inlet pneumatic valve 601 and the first liquid production pneumatic valve 181 to complete the switching of the two modules. At this time, the second silicon carbide ceramic membrane module 702 is used for filtration, the filtration of the first silicon carbide ceramic membrane module 701 is stopped, and the first silicon carbide ceramic membrane module 701 is backwashed.

[0034] In this embodiment, a sixth backwashing pneumatic valve is installed between the liquid inlet of the top of the liquid storage tank 14 and the liquid production pipeline. Opening the sixth backwashing pneumatic valve can supplement water into the liquid storage tank for backwashing. The first backwashing pneumatic valve 111, the second backwashing pneumatic valve 112, the third backwashing pneumatic valve 113, the fourth backwashing pneumatic valve 114, the fifth backwashing pneumatic valve 115, and the seventh backwashing pneumatic valve 117 are used for backwashing control. The backwashing uses two processes of water backwashing and air-water backwashing alternately. First, water backwashing is used to backwash the first silicon carbide ceramic membrane module 701. Open the first sewage pneumatic valve 801, the first backwashing pneumatic valve 111, the third backwashing pneumatic valve 113, and the fifth backwashing pneumatic valve 115 in sequence, and start the backwashing pump to backwash the first silicon carbide ceramic membrane module 701. The backwashing time lasts for 30 s, and the backwashed concentrated water is discharged from the first sewage outlet 901.

[0035] When the pollutants are enriched to a certain amount on the filtration surface of the second silicon carbide ceramic membrane module 702, that is, when the difference between the readings of the influent pressure gauge 5 and the second product water pressure gauge 102 is greater than 1 bar, open the first influent pneumatic valve 601 and the first product liquid pneumatic valve 181, and close the second influent pneumatic valve 602 and the second product liquid pneumatic valve 182. At this time, the first silicon carbide ceramic membrane module 701 is used for filtration, the filtration of the second silicon carbide ceramic membrane module 702 is stopped, and the second silicon carbide ceramic membrane module 702 is backwashed. First, the second silicon carbide ceramic membrane module 702 is backwashed by water backwashing. Sequentially open the second sewage pneumatic valve 802, the second backwashing pneumatic valve 112, the third backwashing pneumatic valve 113, and the fifth backwashing pneumatic valve 115. Start the backwashing pump to backwash the first silicon carbide ceramic membrane module 702. The backwashing time lasts for 30 s, and the backwashed concentrated water is discharged from the first sewage outlet 902.

[0036] During the actual use process, after 5 times of water backwashing, the membrane module also needs to be subjected to a gas-water mixed flushing to further clean the membrane surface. The first silicon carbide ceramic membrane module 701 is subjected to gas-water mixed flushing. Sequentially open the first sewage pneumatic valve 801, the first backwashing pneumatic valve 111, the fourth backwashing pneumatic valve 114, and the seventh backwashing pneumatic valve 114. The air pressure in the air storage tank 15 is used to apply pressure to the water in the liquid storage tank 14 to perform gas-water backwashing on the first silicon carbide ceramic membrane module 701. The backwashing time is 5 s, and the backwashing pressure is 5.5 bar, which is displayed by the backwashing pressure gauge 12.

[0037] In the specific setting, the first silicon carbide ceramic membrane module 701 and the second silicon carbide ceramic membrane module 702 include a housing 71 and a silicon carbide ceramic membrane inside the housing 71. The top of the housing 71 is connected and provided with a membrane module influent port 711, the side wall of the housing 71 is connected and provided with a purified liquid outlet 712, the middle part of the side wall of the housing 71 is connected and provided with a backwashing inlet 714, and the bottom of the housing 71 is connected and provided with a sewage outlet 713. Thus, a structure of upper influent, side product, and lower sewage discharge is formed on the housing 71 of the silicon carbide ceramic membrane module. A fixing frame 72 is installed outside the housing 71. The fixing frame 72 includes a clamp 721 and a support seat 722. The clamp 721 is fixedly sleeved on the outer peripheral side of the housing 71, and the support seat 722 is fixedly arranged at the bottom of the clamp 721. The housing 71 is installed and fixed through the clamp 721 and the support seat 722 to enable the stable operation of the first silicon carbide ceramic membrane module 701 and the second silicon carbide ceramic membrane module 702.

[0038] In this embodiment, a liquid level gauge 141 is inlaid on the outer peripheral wall of the front of the liquid storage tank 14. The position of the liquid level gauge is convenient for observing the water volume in the liquid storage tank 14. An installation bracket 142 is fixedly arranged at the bottom of the liquid storage tank.

[0039] In some specific embodiments, a liquid inlet thermometer 4 is further installed between the feed pump and the communication pipeline of the liquid inlet pressure gauge 5. The liquid inlet thermometer 4 is used to measure and display the liquid inlet temperature. The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. An online purification device for machining coolant, characterized in that: The invention comprises a raw liquid tank (1), a feed pump (2), a silicon carbide ceramic membrane assembly and a liquid storage tank (14); the silicon carbide ceramic membrane assembly comprises a shell (71), and a silicon carbide ceramic membrane is arranged inside the shell (71); the top of the shell (71) is connected to a membrane assembly liquid inlet (711), the side wall of the shell (71) is connected to a clean liquid outlet (712), the middle of the side wall of the shell (71) is connected to a backwash inlet (714), and the bottom of the shell (71) is connected to a sewage outlet (713); the inlet end of the feed pump (2) is connected to the raw liquid tank (1), the outlet end of the feed pump (2) is connected to the membrane assembly liquid inlet (711), and a liquid inlet regulating valve (3) and a liquid inlet pressure gauge (5) are installed in sequence between the connecting pipeline between the silicon carbide ceramic membrane assembly and the feed pump (2); the clean liquid outlet (712) is connected to a production liquid outlet (20), and the clean liquid outlet (714) is connected to a backwash inlet (714). A liquid production pressure gauge, a liquid production pneumatic valve and a liquid production flow meter (19) are sequentially connected between the liquid storage tank (712) and the liquid production port (20); the liquid storage tank (14) is provided with a backwash air inlet (143), a liquid storage tank liquid inlet (144), a pressure relief port (145) and a first backwash outlet (146); the backwash inlet (714) is connected to the first backwash outlet (146); a backwash pneumatic valve, a backwash pressure gauge (12) and a backwash pump (13) are sequentially connected between the backwash inlet (714) and the first backwash outlet (146); a backwash pneumatic valve is connected between the liquid storage tank (14) and the pressure relief port (145), and between the liquid storage tank liquid inlet (144) and the liquid production port (20); the backwash air inlet (143) is also connected to an air storage tank (15) or an air source, and the air storage tank (15) is connected to an air compressor (16).

2. The online purification device for machining coolant according to claim 1, characterized in that: The silicon carbide ceramic membrane assembly comprises a first silicon carbide ceramic membrane assembly (701) and a second silicon carbide ceramic membrane assembly (702); a first liquid production pressure gauge (101) and a first liquid production pneumatic valve (181) are installed at the liquid outlet of the first silicon carbide ceramic membrane assembly (701), a second liquid production pressure gauge (102) and a second liquid production pneumatic valve (182) are installed at the liquid outlet of the second silicon carbide ceramic membrane assembly (702), a third liquid production pneumatic valve (183) and a liquid production flowmeter (19) are connected in sequence between the liquid outlet of the first silicon carbide ceramic membrane assembly (701) and the liquid outlet of the second silicon carbide ceramic membrane assembly (702) and the liquid production port (20); a first backwashing pneumatic valve (111) and a second backwashing pneumatic valve (112) are installed at the backwashing inlets of the first silicon carbide ceramic membrane assembly (701) and the second silicon carbide ceramic membrane assembly (702). ); a backwash pressure gauge (12), a third backwash pneumatic valve (113) and a backwash pump (13) are arranged in sequence between the first backwash pneumatic valve (111), the second backwash pneumatic valve (112) and the first backwash outlet (146); the liquid storage tank (14) is also provided with a second backwash outlet (147), and a fourth backwash pneumatic valve (114) is connected between the second backwash outlet (147) and the backwash pressure gauge (12); a fifth backwash pneumatic valve (115) is installed at the pressure relief port (145); the liquid storage tank liquid inlet (144) is connected to the third liquid production pneumatic valve (183), and a sixth backwash pneumatic valve (116) is connected between the liquid storage tank liquid inlet (144) and the third liquid production pneumatic valve (183); and a seventh backwash pneumatic valve (117) is connected between the backwash air inlet (143) and the air storage tank (15).

3. The online purification device for machining coolant according to claim 1, characterized in that: A liquid inlet temperature gauge (4) is also installed between the connecting pipeline between the liquid inlet regulating valve (3) and the liquid inlet pressure gauge (5), and the liquid inlet temperature gauge (4) is used to measure and display the liquid inlet temperature.

4. The online purification device for machining coolant according to claim 1, characterized in that: A fixing frame (72) is installed outside the shell (71), and the fixing frame comprises a clamp (721) and a support seat (722). The clamp (721) is fixedly sleeved on the outer peripheral side of the shell, and the support seat (722) is fixedly arranged on the bottom of the clamp (721).

5. The online purification device for machining coolant according to claim 1, characterized in that: A liquid level meter (141) is inlaid on the outer peripheral wall of the front side of the liquid storage tank (14), and a mounting bracket (142) is fixedly provided at the bottom of the liquid storage tank.

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