Cutting fluid recycling system and method

Abstract

The invention relates to a cutting fluid recycling system and method which are mainly used for solving the technical problems that an existing cutting waste fluid treatment and recycling system is high in cost and single in transportation line, and cutting fluid is prone to spoilage. The invention discloses a cutting fluid recycling system which comprises at least one fluid supply main pipe, at least one fluid return main pipe, a buffer fluid tank, a purifying and filtering device, a fluid supply control valve and a fluid return control valve. Cutting fluid discharged by machining equipment flows back to the buffer liquid box through the liquid return main pipe, the buffer liquid box conveys the cutting fluid to the purification and filtration device, a coarse filter and a fine filter in the purification and filtration device sequentially conduct coarse filtration and fine filtration on the cutting fluid, and the cutting fluid obtained after fine filtration is conveyed into a liquid box of the machining equipment through the liquid supply main pipe. The cutting fluid recycling device has the advantages of high efficiency and low cost.

Description

Technical Field

[0001] The invention relates to a cutting fluid discharge method, and in particular to a cutting fluid circulation recovery system and method. Background Art

[0002] Cutting fluid is a liquid used in the metalworking process, primarily to improve machining conditions, efficiency, and quality. Routine maintenance of cutting fluid is crucial for ensuring machining quality, reducing operating costs, extending service life, and achieving green production. Neglecting maintenance not only leads to rapid deterioration of cutting fluid performance but also can cause equipment corrosion, workpiece contamination, and employee health risks.

[0003] The main measures to maintain cutting fluid performance and ensure processing quality are:

[0004] (1) Control concentration: If the cutting fluid concentration is too low (<3%), it will lead to insufficient lubricity and aggravate tool wear (shortening tool life by 30% to 50%). If the concentration is too high (>10%), it will easily remain on the workpiece surface, affecting subsequent coating or welding processes. A refractometer should be used to check and monitor the concentration daily.

[0005] (2) Maintaining a stable pH value: The ideal pH range is 8.5-9.5. When pH is less than 8, bacterial reproduction is accelerated (the number of colonies can exceed 10 within 24 hours). 6 CFU / mL), producing harmful gases such as hydrogen sulfide; pH>10 will corrode aluminum alloy workpieces.

[0006] (3) Remove impurities: Metal debris (such as iron chips, aluminum powder) will scratch the surface of the workpiece (Ra value increases by 20%-40%). The equipment needs to be equipped with a real-time filter to achieve the filtering effect of the cutting fluid, so that the iron chip removal efficiency is greater than 95% and the filtration accuracy is greater than 50μm.

[0007] Patent CN109260818A discloses a chip waste liquid treatment device and chip recovery system. This system separates and purifies chips and cutting fluid through the coordination of a vacuum paper belt filter, a fluid supply device, and an electrical control cabinet. However, the equipment is complex, and the transportation of the cutting fluid primarily relies on pumps, resulting in high costs. Furthermore, the system's transportation route is relatively simple, with the cutting fluid flowing through a single circuit within the machine tool. This makes it prone to corruption, equipment corrosion, and environmental pollution. Furthermore, the system has a short service life and high operating costs. Summary of the Invention

[0008] The purpose of the present invention is to solve the technical problems of high cost, single transportation route and easy corruption and deterioration of cutting fluid in existing chip waste liquid treatment and recovery systems, and to propose a cutting fluid circulation recovery system and method.

[0009] To solve the above technical problems, the present invention provides the following technical solutions:

[0010] A cutting fluid recycling system is used to recycle cutting fluid discharged from processing equipment, including equipment-end filters located in the clean liquid area and dirty liquid area of ​​the processing equipment liquid tank;

[0011] The outlet of the equipment-side filter located in the dirty liquid area leads to the clean liquid area, and the outlet of the equipment-side filter located in the clean liquid area leads to the cutting fluid input port of the processing equipment;

[0012] The special feature of the invention is that it comprises at least one liquid supply main pipe and liquid return main pipe, as well as a buffer liquid tank, a purification and filtering device, a liquid supply control valve and a liquid return control valve;

[0013] One end of the liquid return pipe is used to connect to the overflow port of the dirty liquid area of ​​the processing equipment, and the other end is connected to the input port of the buffer liquid tank; a liquid return power pump is provided at the other end of the liquid return pipe;

[0014] The purification and filtering device includes a dirty liquid tank, a discharge pipe, and a clean liquid tank;

[0015] The input port of the dirty liquid tank is connected to the output port of the buffer liquid tank, and the output port is connected to one end of the discharge pipe; a coarse filter is provided in the dirty liquid tank;

[0016] The other end of the discharge pipe is connected to the input port of the clean liquid tank;

[0017] The clean liquid tank is provided with a fine filter, the output port of the clean liquid tank is connected to one end of the liquid supply pipe, and the other end of the liquid supply pipe is connected to the clean liquid area input port of the processing equipment, so as to provide filtered cutting fluid to the processing equipment; the liquid supply pipe is provided with a liquid supply pump;

[0018] The liquid supply control valve is installed at the other end of the liquid supply main pipe to control the on and off of the liquid supply main pipe; the liquid return control valve is installed at one end of the liquid return main pipe to control the on and off of the liquid return main pipe.

[0019] Further, it also includes at least one overflow pipe;

[0020] One end of the overflow pipe is connected to the overflow port of the dirty liquid area of ​​the processing equipment, and the other end is connected to one end of the liquid return main pipe.

[0021] Furthermore, the number of the overflow pipes is N, where N≥1; one end of the overflow pipe is connected to the overflow port of the dirty liquid area of ​​N processing equipment respectively;

[0022] It also includes N liquid return branches and N liquid supply branches;

[0023] One end of each of the N liquid return branch pipes is connected to the other end of the overflow pipe, and the other end of the liquid return branch pipe is connected to the liquid return main pipe;

[0024] One end of the N liquid supply branch pipes is connected to the liquid supply main pipe, and the other end is connected to the liquid purification area input port of the processing equipment.

[0025] Furthermore, the purification and filtering device also includes a slag receiving box; the slag receiving box is connected to the fine filter and is used to collect the waste slag after filtration.

[0026] Furthermore, the coarse filter adopts scraping to perform coarse filtration, and the filtration accuracy is 100 μm;

[0027] The fine filter adopts a paper tape for fine filtration, and the filtration accuracy is ≤30μm.

[0028] Furthermore, the clean liquid tank is provided with an oil remover, which adopts a concentrated oil removal method;

[0029] The body of the dirty liquid tank is provided with a liquid level sensor and a visual liquid level gauge for displaying four liquid levels: overflow level, high level, low level and shutdown level, and also has an alarm function.

[0030] Furthermore, an online detection sensor is provided on the liquid supply main pipe to detect the flow rate of the liquid supply main pipe to prevent the flow rate of the liquid supply main pipe from being too large, causing the clean liquid area of ​​the processing equipment to overflow the cutting fluid;

[0031] The buffer liquid tank is provided with a lifting pump for outputting the cutting fluid in the buffer liquid tank to the dirty liquid tank;

[0032] A liquid level controller is also provided in the clean liquid area of ​​the processing equipment and is connected to the liquid supply control valve.

[0033] The present invention also provides a cutting fluid recycling method, which is based on the above-mentioned cutting fluid recycling system and has the following features:

[0034] S1. The dirty liquid after use by the processing equipment is collected in the dirty liquid area; a portion of the cutting fluid in the dirty liquid area is filtered by the equipment-side filter and flows into the clean liquid area through the discharge port. The cutting fluid in the clean liquid area is filtered by the equipment-side filter and then used for processing; the other portion of the cutting fluid in the dirty liquid area automatically flows into the return liquid main through the overflow port;

[0035] S2, open the liquid return control valve and the liquid return power pump to transport the cutting fluid in the liquid return main pipe to the buffer liquid tank;

[0036] S3, after the cutting fluid in the buffer tank reaches the high liquid level, it flows into the dirty liquid tank;

[0037] S4, the cutting fluid is filtered by the coarse filter in the dirty liquid tank and flows into the clean liquid tank through the discharge pipe; the cutting fluid is filtered by the fine filter in the clean liquid tank;

[0038] S5. Open the liquid supply control valve and the liquid supply pump to deliver the finely filtered cutting fluid to the liquid supply main. The cutting fluid in the liquid supply main flows into the clean liquid area of ​​the processing equipment, completing the recycling of the cutting fluid.

[0039] Furthermore, in step S1, another portion of the cutting fluid in the dirty liquid areas of the N processing equipment automatically flows into the N overflow pipes through the overflow ports, and is collected into the liquid return main pipe through the N liquid return branch pipes;

[0040] In step S5, the cutting fluid in the main fluid supply pipe is delivered to different processing equipment through N fluid supply branch pipes.

[0041] Furthermore, after a certain amount of cutting fluid is added to the clean liquid area in the processing equipment, the liquid level controller controls the liquid supply control valve to close.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. The present invention provides a cutting fluid circulation and recovery system, comprising at least one liquid supply pipe and a liquid return pipe, as well as a buffer liquid tank, a purification and filtering device, a liquid supply control valve, and a liquid return control valve; the cutting fluid discharged from the processing equipment flows back to the buffer liquid tank through the liquid return pipe, and the buffer liquid tank conveys the cutting fluid to the purification and filtering device. The coarse filter and the fine filter in the purification and filtering device sequentially perform coarse filtration and fine filtration on the cutting fluid, and the cutting fluid after fine filtration is conveyed to the liquid tank of the processing equipment through the liquid supply pipe, thereby realizing the recycling and reuse of the cutting fluid, and having the advantages of high efficiency and low cost.

[0044] 2. The present invention provides a cutting fluid circulation and recovery system, in which an overflow pipe is provided to collect the cutting fluid discharged by the processing equipment. The return fluid relies on automatic overflow, and there is no need to separately configure a power lift pump and a lift fluid tank for the processing equipment. Only a return fluid power pump needs to be installed on the return fluid main pipe. The average investment is about 15,000 yuan per unit, which is much lower than the industry average investment of 50,000 yuan per unit.

[0045] 3. The present invention provides a cutting fluid circulation and recovery system, which is provided with a liquid return main pipe, a liquid return branch pipe and an overflow pipe, so that the cutting fluid can flow, and the intervention of oxygen is increased during the flow process, which prevents the cutting fluid from being corrupted and deteriorating in a static state, and helps to increase the life of the cutting fluid.

[0046] 4. The present invention provides a simple method for recycling and recovering cutting fluid. By opening the liquid supply control valve, liquid return control valve, liquid supply pump, and liquid return power pump, the cutting fluid can be automatically purified and recovered. This method requires no specialized personnel for management and maintenance, and features a one-button start function. This method effectively ensures machining quality, reduces operating costs, and extends the service life of the cutting fluid, creating a green technology with near-zero waste liquid emissions.

[0047] 5. The present invention provides a cutting fluid recycling method. The purified cutting fluid meets the following requirements: 95% of impurity particles are ≤30 μm in size, the impurity content is ≤150 mg / L after filtration with a 5 μm filter membrane, and the fluid is odorless and clear in color. Concentration and pH detection sensors have a detection accuracy of ≤0.1%.

[0048] 6. The present invention provides a cutting fluid recycling method, which employs multiple return and supply branches, connected in series or parallel, to simultaneously connect multiple processing equipment. Using this production line, the cutting fluid lifespan is extended to over one year, cutting fluid stock consumption is reduced by over 20%, maintenance costs are lowered by over 100,000 yuan per year, water consumption is reduced by over 25%, and waste fluid emissions are reduced by over 90%. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a schematic diagram of the layout of an embodiment of a cutting fluid recycling system of the present invention;

[0050] Figure 2 This is a schematic diagram of the connection of a purification and filtration device in an embodiment of a cutting fluid recycling system of the present invention;

[0051] Figure 3 This is a schematic diagram of the layout of the liquid tank pipeline of the processing equipment in an embodiment of the cutting fluid circulation and recovery system of the present invention.

[0052] Description of reference numerals:

[0053] 1. Purification and filtration device; 11. Dirt liquid tank; 12. Coarse filter; 13. Discharge pipe; 14. Degreaser; 15. Clean liquid tank; 16. Fine filter; 17. Slag receiving box; 18. Liquid supply pump; 19. Online detection sensor;

[0054] 21. Liquid return main pipe; 22. Liquid return branch pipe; 3. Buffer liquid tank; 41. Liquid supply main pipe; 42. Liquid supply branch pipe; 43. Liquid return power pump;

[0055] 5. Overflow pipe; 6. Equipment end filter; 7. Liquid level controller; 8. Liquid supply control valve; 9. Liquid return control valve. DETAILED DESCRIPTION

[0056] The present invention will be further described below with reference to the accompanying drawings and examples.

[0057] The present invention provides a cutting fluid recycling system, such as Figures 1 to 3 As shown, it includes at least one liquid supply main pipe 41 and liquid return main pipe 21, N liquid return branch pipes 22, N liquid supply branch pipes 42, N overflow pipes 5, N ≥ 1; as well as a buffer liquid tank 3, a purification and filtering device 1, a liquid supply control valve 8 and a liquid return control valve 9.

[0058] The cutting fluid recycling system is used to recycle cutting fluid discharged from processing equipment. The processing equipment's fluid tank is divided into a clean fluid area and a dirty fluid area, both of which are equipped with a device-side filter 6. A liquid level controller 7 is also installed in the clean fluid area of ​​the processing equipment. The outlet of the device-side filter 6 in the dirty fluid area leads to the clean fluid area, while the outlet of the device-side filter 6 in the clean fluid area leads to the cutting fluid inlet of the processing equipment.

[0059] One end of each of the N overflow pipes 5 is connected to the overflow ports of the waste liquid areas of the N processing equipment. The other end is connected to one end of each of the N return branch pipes 22. The other ends of the N return branch pipes 22 are connected to the return main pipe 21. The other end of the return main pipe 21 is connected to the inlet of the buffer liquid tank 3. A return power pump 43 is installed on the return main pipe 21.

[0060] The purification and filtering device 1 includes a dirty liquid tank 11 , a discharge pipe 13 , an oil remover 14 , a clean liquid tank 15 , and a slag receiving box 17 .

[0061] The inlet of the dirty liquid tank 11 is connected to the outlet of the buffer liquid tank 3, which in turn is connected to one end of a discharge pipe 13. A lift pump is installed within the buffer liquid tank 3 to pump the cutting fluid from the buffer liquid tank 3 into the dirty liquid tank 11. A coarse filter 12 is installed within the dirty liquid tank 11. This filter uses scraping and filtration to achieve a filtration accuracy of 100 μm. This filter effectively separates and discharges most of the cuttings from the dirty liquid.

[0062] The other end of the discharge pipe 13 is connected to the input port of the clean liquid tank 15 .

[0063] A fine filter 16 is installed within the clean fluid tank 15. A slag collection box 17 is connected to the fine filter 16 to collect the filtered waste residue. Fine filter 16 uses a paper tape for fine filtration, with a filtration accuracy of ≤30μm. The finely filtered cutting fluid meets the filtration accuracy requirements.

[0064] The output port of the clean liquid tank 15 is connected to one end of the liquid supply main 41. N liquid supply branches 42 each have one end connected to the liquid supply main 41 and the other end connected to the input port of the clean liquid area of ​​the processing equipment, providing filtered cutting fluid to the processing equipment. The liquid supply main 41 is equipped with a liquid supply pump 18 and an online detection sensor 19. The online detection sensor 19 is used to detect the flow rate of the liquid supply main 41. This prevents excessive flow from the liquid supply main 41, which could cause cutting fluid to overflow from the clean liquid area of ​​the processing equipment.

[0065] Cutting fluid is very easy to spoil when it is in a static state. Therefore, the present invention is provided with an overflow pipe 5 and a liquid return main pipe 21 and a liquid return branch pipe 22 to make the cutting fluid flow, increase the oxygen introduced during the flow process, and help to extend the life of the cutting fluid.

[0066] The degreaser 14 utilizes a concentrated degreasing method. It effectively removes any oil floating on the cutting fluid surface. The skimmed oil, which also contains emulsions or foam, undergoes further oil-water separation. The net oil content is required to be below 1%. After treatment, the amount of oil floating on the cutting fluid surface in the dirty liquid tank 11 is limited to 5% of the total surface area. The amount of oil floating on the cutting fluid surface in the processing equipment's fluid tank is limited to 10% of the total surface area.

[0067] The purification and filtering device 1 also includes a control display screen, which has automatic monitoring of the cutting fluid index concentration and pH value, an automatic proportioning and adding function of the cutting fluid, and an automatic allocation and selection control function for production modes such as series and parallel.

[0068] The liquid supply control valve 8 is installed at the other end of the liquid supply main pipe 41 to control the on / off of the liquid supply main pipe 41. The liquid return control valve 9 is installed at one end of the liquid return main pipe 21 to control the on / off of the liquid return main pipe 21. The liquid supply control valve 8 is connected to the liquid level controller 7.

[0069] Both the supply control valve 8 and the return control valve 9 can be opened and closed very slowly to ensure absolute pipeline stability and safety, mitigating the risk of water hammer caused by valve opening and closing. The supply main pipe 41 is provided with necessary supports. The return main pipe 21 is designed for flow rates to prevent blockage and backflow of return liquid, and is equipped with a check valve. All piping designs fully consider dynamic and static loads, ensuring adequate structural support for static and dynamic forces, ensuring no noticeable displacement during operation. All piping is free of any internal or external scale.

[0070] The present invention also provides a cutting fluid recycling method, based on the above-mentioned cutting fluid recycling system, comprising the following steps:

[0071] S1. Cutting fluid used in processing equipment is collected in the dirty liquid area; a portion of the cutting fluid in the dirty liquid areas of N processing equipment is filtered through the equipment-side filter 6 and flows into the clean liquid area through the discharge port. The cutting fluid in the clean liquid area is filtered through the equipment-side filter 6 and used for processing; another portion of the cutting fluid in the dirty liquid areas of N processing equipment automatically flows into N overflow pipes 5 through the overflow port and is collected into the liquid return main pipe 21 through the liquid return branch pipe 22;

[0072] S2, open the liquid return control valve 9 and the liquid return power pump 43 to transport the cutting fluid in the liquid return main pipe 21 to the buffer liquid tank 3;

[0073] S3, after the cutting fluid in the buffer tank 3 reaches the high liquid level, it flows into the dirty liquid tank 11;

[0074] S4, the cutting fluid is filtered by the coarse filter 12 in the dirty liquid tank 11 and flows into the clean liquid tank 15 through the discharge pipe 13; the cutting fluid is filtered by the fine filter 16 in the clean liquid tank 15;

[0075] S5. Open the liquid supply control valve 8 and the liquid supply pump 18 to deliver the finely filtered cutting fluid to the liquid supply main pipe 41. The cutting fluid in the liquid supply main pipe 41 is delivered to different processing equipment through N liquid supply branches 42, completing the recycling of the cutting fluid.

[0076] The method of the present invention can be used to connect new production lines and equipment in parallel or series without restriction. The number of new production lines and equipment only affects the total flow rate. The return pump model, the size of the liquid tank of the purification and filtration device, and the diameter of the supply and return main pipes can be appropriately increased.

[0077] like Figure 1 The example shown is a filtration system with 4 production lines and 28 devices. Figure 1 Production line 1 is connected in series with production line 2, and production line 3 is connected in series with production line 3. At the same time, the two series production lines are also connected in parallel with each other.

[0078] When all four production lines are connected in series, the purification and filtration device 1 is paired with the processing equipment 1 to 28, and all processing equipment can simultaneously achieve real-time purification and filtration, with a filtration flow rate of about 6-10 ml / min. The liquid supply control valve 8 is normally open, and the overflow pipe 5 and the return liquid control valve 9 are normally open. Cutting fluid is continuously added to the liquid tank in the clean liquid area of ​​the processing equipment. After the cutting fluid in the clean liquid area of ​​the processing equipment is added to a certain amount, the liquid level controller 7 controls the liquid supply control valve 8 to close. Prevent excessive addition of cutting fluid, which may cause overflow. After the cutting fluid in the dirty liquid area reaches a high liquid level, the excess cutting fluid flows out from the overflow port to the return liquid branch pipe 22 or the return liquid main pipe 21.

[0079] When all four production lines are connected in parallel, the purification and filtration device 1 is connected to the processing equipment in a 1-to-1 or 1-to-many manner. All machine tools are grouped and the cutting fluid is filtered one by one or group by group with purification and filtration, and the filtration flow rate is about 30-50ml / min.

[0080] The two implementations share the same cutting fluid filtration steps, differing only in the filtration flow rate and applicable operating conditions. The series mode is suitable for single-machine fluid tanks less than 300L, where the cutting fluid is in poor condition, such as high impurity content and excessive oil. The parallel mode is suitable for fluid tanks greater than 300L, where the cutting fluid is in good condition, such as low impurity content and minimal oil.

[0081] The liquid tank volume of a single processing equipment is about 1.6m 3 In this embodiment, there are 28 processing equipments with a total volume of about 44.8m 3. When the system is shut down, the cutting fluid in the pipeline is fully returned to the system to prevent overflow. A buffer device is provided at the input port of the dirty liquid tank 11 to prevent turbulence and foaming of the liquid. The dirty liquid tank 11 is provided with an emptying port at the bottom plate, equipped with a manual butterfly valve and a quick-connect flange. The body of the dirty liquid tank 11 is provided with a liquid level sensor and a visual liquid level gauge, which can display four liquid levels: overflow level, high level, low level, and shutdown level, and also has an alarm function. Ensure that the cutting fluid does not overflow or is emptied. The body of the dirty liquid tank 11 is made of Q235 steel plate, the side panels are made of channel steel as the frame, and the cover of the box is made of anti-slip patterned steel plate. The thickness of the side panels of the box is ≥6mm, and the thickness of the bottom plate is ≥10mm. Each box is provided with a discharge port, equipped with a manual butterfly valve, and a quick-connect flange. The dirty liquid tank 11 is equipped with an emptying pump, and the output pressure of the emptying pump is ≥1.5bar.

[0082] The purification and filtration unit 1 is equipped with a filter jam monitor to monitor the scraper chain's operating status at all times. The PLC monitors the chain drive motor's speed and load to ensure proper system operation, providing prompt alarms should any system problems arise. In the event of a chain jam, a chain jam alarm and shutdown protection are provided. A reverse slow-speed reversing function is also included. Moving components, including the sprocket, scraper, chain guide, and sprocket shaft, are made of high-quality materials that are wear-resistant, corrosion-resistant, and tensile-resistant, ensuring a long service life and easy maintenance. Power components are wear-resistant, corrosion-resistant, and tension-resistant, making them easy to maintain. Chain links are quick-change for easy routine maintenance and replacement. The drive systems for the coarse filter 12 and fine filter 16 are equipped with overload protection. Measures are in place to prevent chips from jamming the chain, and the scraper chain's operating status is monitored at all times. Automatic cleaning of chips and other solid impurities adhering to the chain and scraper prevents the long-term accumulation of dirt on moving components. The support mesh for the coarse filter 12 and the fine filter 16 is made of high-quality stainless steel. The contact area with the belt is smooth and polished, ensuring no damage to the circulating belt and monitoring for blockage. The coarse filter 12 and the fine filter 16 are designed for reliability and stability, and feature bottom cleaning piping for real-time flushing and filtration to prevent accumulation. The filtration system requires maintenance every two years or more.

Claims

1. A cutting fluid recycling system for recycling cutting fluid discharged from a processing device, comprising device-end filters (6) located in a clean liquid area and a dirty liquid area of ​​a processing device fluid tank; The outlet of the equipment end filter (6) located in the dirty liquid area leads to the clean liquid area, and the outlet of the equipment end filter (6) located in the clean liquid area leads to the cutting fluid input port of the processing equipment; Its characteristics are: It comprises at least one liquid supply main pipe (41) and a liquid return main pipe (21), as well as a buffer liquid tank (3), a purification and filtering device (1), a liquid supply control valve (8) and a liquid return control valve (9); One end of the liquid return main pipe (21) is connected to the overflow port of the dirty liquid area of ​​the processing equipment, and the other end is connected to the input port of the buffer liquid tank (3); a liquid return power pump (43) is provided at the other end of the liquid return main pipe (21); The purification and filtering device (1) comprises a dirty liquid tank (11), a discharge pipe (13), and a clean liquid tank (15); The input port of the dirty liquid tank (11) is connected to the output port of the buffer liquid tank (3), and the output port is connected to one end of a discharge pipe (13); a coarse filter (12) is provided in the dirty liquid tank (11); The other end of the discharge pipe (13) is connected to the input port of the clean liquid tank (15); A fine filter (16) is provided in the clean liquid tank (15), the output port of the clean liquid tank (15) is connected to one end of a liquid supply pipe (41), and the other end of the liquid supply pipe (41) is connected to an input port of a clean liquid area of ​​a processing device, for providing filtered cutting fluid to the processing device; a liquid supply pump (18) is provided on the liquid supply pipe (41); The liquid supply control valve (8) is installed at the other end of the liquid supply main pipe (41) and is used to control the on-off of the liquid supply main pipe (41); the liquid return control valve (9) is installed at one end of the liquid return main pipe (21) and is used to control the on-off of the liquid return main pipe (21).

2. A cutting fluid recycling system according to claim 1, characterized in that: Also includes at least one overflow pipe (5); One end of the overflow pipe (5) is connected to the overflow port of the dirty liquid area of ​​the processing equipment, and the other end is connected to one end of the liquid return main pipe (21).

3. A cutting fluid recycling system according to claim 2, characterized in that: The number of the overflow pipes (5) is N, where N≥1; one end of the overflow pipe (5) is respectively connected to the overflow ports of the dirty liquid areas of N processing equipment; It also includes N liquid return branches (22) and N liquid supply branches (42); One end of each of the N liquid return branch pipes (22) is connected to the other end of the overflow pipe (5), and the other end of the liquid return branch pipe (22) is connected to the liquid return main pipe (21); One end of the N liquid supply branch pipes (42) is communicated with the liquid supply main pipe (41), and the other end is connected to the liquid purification zone input port of the processing equipment.

4. The cutting fluid recycling system according to claim 1, characterized in that: The purification and filtering device (1) further comprises a slag receiving box (17); the slag receiving box (17) is connected to the fine filter (16) and is used to collect the filtered waste slag.

5. A cutting fluid recycling system according to claim 4, characterized in that: The coarse filter (12) adopts scraping to perform coarse filtration, and the filtration accuracy is 100 μm; The fine filter (16) adopts a paper tape for fine filtration, and the filtration accuracy is ≤30 μm.

6. The cutting fluid recycling system according to claim 1, characterized in that: The clean liquid tank (15) is provided with an oil remover (14), and the oil remover (14) adopts a concentrated oil removal method; The body of the dirty liquid tank (11) is provided with a liquid level sensor and a visual liquid level gauge for displaying four liquid levels, namely overflow liquid level, high liquid level, low liquid level and shutdown liquid level, and also has an alarm function.

7. The cutting fluid recycling system according to claim 1, characterized in that: The liquid supply main pipe (41) is provided with an online detection sensor (19) for detecting the flow rate of the liquid supply main pipe (41) to prevent the flow rate of the liquid supply main pipe (41) from being too large, thereby causing the clean liquid area of ​​the processing equipment to overflow the cutting fluid; A lifting pump is provided in the buffer liquid tank (3) for outputting the cutting fluid in the buffer liquid tank (3) to the dirty liquid tank (11); A liquid level controller (7) is also provided in the liquid purification area of ​​the processing equipment and is connected to the liquid supply control valve (8).

8. A cutting fluid recycling method, based on a cutting fluid recycling system according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, the dirty liquid after being used by the processing equipment is collected in the dirty liquid area; a part of the cutting fluid in the dirty liquid area is filtered by the equipment end filter (6) and flows into the clean liquid area through the discharge port, and the cutting fluid in the clean liquid area is filtered by the equipment end filter (6) and used for processing; another part of the cutting fluid in the dirty liquid area automatically flows into the liquid return main (21) through the overflow port; S2, open the liquid return control valve (9) and the liquid return power pump (43) to transport the cutting fluid in the liquid return main pipe (21) to the buffer liquid tank (3); S3, after the cutting fluid in the buffer liquid tank (3) reaches the high liquid level, it flows into the dirty liquid tank (11); S4, the cutting fluid is filtered by the coarse filter (12) in the dirty liquid tank (11), and then flows into the clean liquid tank (15) through the discharge pipe (13); the cutting fluid is filtered by the fine filter (16) in the clean liquid tank (15); S5. Open the liquid supply control valve (8) and the liquid supply pump (18) to deliver the finely filtered cutting fluid to the liquid supply main pipe (41). The cutting fluid in the liquid supply main pipe (41) flows into the clean liquid area of ​​the processing equipment, completing the cutting fluid recycling.

9. A cutting fluid recycling method according to claim 8, characterized in that: In step S1, another part of the cutting fluid in the dirty liquid area of ​​N processing equipment automatically flows into N overflow pipes (5) through the overflow port, and is collected into the liquid return main pipe (21) through N liquid return branch pipes (22); In step S5, the cutting fluid in the liquid supply main pipe (41) is delivered to different processing equipment through N liquid supply branch pipes (42).

10. A cutting fluid recycling method according to claim 9, characterized in that: After a certain amount of cutting fluid is added to the clean liquid area of ​​the processing equipment, the liquid level controller (7) controls the liquid supply control valve (8) to close.

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