Cutting fluid recycling treatment system and purification recovery method

Abstract

The application discloses a cutting fluid recycling treatment system and purification recovery method, which sequentially comprises mutually connected liquid inlet pipe, basket type filtering device, hydraulic cyclone device, jet mixing device, pipeline type electrolysis device and sedimentation tank; the hydraulic cyclone device comprises an outer cylinder, a cyclone and a vortex separation assembly, the vortex separation assembly is arranged below the cyclone and forms a chip collection cavity below the inner cavity of the outer cylinder; the vortex separation assembly comprises vortex vanes, the vortex vanes are curved surfaces which are inclined from bottom to top and outward convex, and the extending direction of the vortex vanes is arranged at an acute angle with the circumferential tangent; the sedimentation tank comprises a tank body, the tank body comprises a gas flotation zone, an inclined plate separation zone and a residue hopper zone from top to bottom; the gas flotation zone is provided with an oil discharge groove, and the inclined plate separation zone is provided with mutually spaced and parallel inclined settling plates; the system realizes efficient purification and recycling of the cutting fluid and metal recovery through five-stage series treatment, and gradually removes solid particles, oil stains and microorganisms in the cutting fluid.

Description

Technical Field

[0001] This invention relates to the technical field of industrial wastewater treatment technology, and in particular to a cutting fluid recycling system and purification and recovery method. Background Technology

[0002] In the machining field, especially in the processing of non-ferrous metals such as aluminum alloys and magnesium alloys, cutting fluids are widely used as cooling, lubrication, rust prevention, and cleaning media. However, as the machining process continues, cutting fluids accumulate large amounts of metal shavings, impurities, and oil, and breed bacteria and mold, leading to performance degradation. High-performance cutting fluid concentrates are expensive, and waste cutting fluids are classified as hazardous waste at the end of their service life, resulting in extremely high outsourcing costs. This places a significant direct economic burden on enterprises and causes a serious waste of resources. Furthermore, in aluminum alloy machining, the generated aluminum shavings are soft and easily form fine fragments that mix into the cutting fluid. These aluminum shavings themselves also have high recycling value.

[0003] Patent document CN120305754B discloses a workstation for multi-stage cutting fluid treatment. The device includes a secondary fluid tank, a separator, a chip collection cart, a primary fluid tank, and a cleaning tank fixedly installed at the top center of the secondary fluid tank. A separator is fixedly installed on one side of the cleaning tank. The device also includes a tertiary fluid tank fixedly installed on the top of the cleaning tank, a conveying assembly on one side of the separator, a cleaning assembly inside the separator, and a filter press assembly on the top of the tertiary fluid tank. The conveying assembly includes an installation groove and a conveying chain plate fixedly installed inside the installation groove. Installation plates are symmetrically fixedly connected to the top of the installation groove.

[0004] Patent document with application publication number CN120643969A discloses a cutting fluid continuous recycling and treatment device, including a collection funnel, an adsorption mechanism, a sedimentation mechanism and a disinfection mechanism. The collection funnel is equipped with an adsorption mechanism that can adsorb iron filings, the adsorption mechanism is equipped with a sedimentation mechanism that can precipitate impurities in the cutting fluid, and the sedimentation mechanism is equipped with a disinfection mechanism that can disinfect the cutting fluid.

[0005] Patent document CN120696831A discloses a cutting fluid recycling system and method, including at least one supply pipe and return pipe, as well as a buffer tank, a purification and filtration device, a supply control valve, and a return control valve. The cutting fluid discharged from the machining equipment flows back to the buffer tank through the return pipe. The buffer tank then transports the cutting fluid to the purification and filtration device. The coarse filter and fine filter in the purification and filtration device sequentially perform coarse filtration and fine filtration on the cutting fluid. The finely filtered cutting fluid is then transported to the tank of the machining equipment through the supply pipe, realizing the recycling and reuse of the cutting fluid. This method has the advantages of high efficiency and low cost.

[0006] In summary, as well as other existing technologies, current cutting fluid purification and recovery equipment generally suffers from numerous problems, such as extremely poor separation efficiency, incomplete purification, ineffective sterilization, and impaired reuse. Summary of the Invention

[0007] In order to solve the problems existing in the prior art, the present invention provides a cutting fluid recycling system and purification and recovery method with better purification effect.

[0008] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a cutting fluid recycling and treatment system, which includes, in sequence, an inlet pipe, a basket filter, a hydrocyclone device, a jet mixing device, and a sedimentation tank connected in series.

[0009] The hydrocyclone device includes an outer cylinder, a cyclone generator, and a vortex separation assembly. The vortex separation assembly is located below the cyclone generator and forms a debris collection cavity below the inner cavity of the outer cylinder. The vortex separation assembly includes vortex blades, which are curved surfaces that are inclined from bottom to top with their convex surfaces facing outwards and whose extension direction is set at an acute angle to the circumferential tangent.

[0010] The sedimentation tank includes a tank body, which from top to bottom includes an air flotation zone, an inclined plate separation zone, and a slag hopper zone;

[0011] The air flotation zone is equipped with an oil drain trough, and the inclined plate separation zone is equipped with mutually spaced and parallel inclined settling plates; the inclined plate separation zone is equipped with a liquid outlet at a height lower than that of the oil drain trough.

[0012] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the basket filter device includes two basket filters connected in parallel, the inlets of the two basket filters are connected to the same liquid inlet pipe, and the outlets of the two basket filters are connected to the hydrocyclone device through the same pipe.

[0013] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the jet mixing device includes a liquid flow pipe and an air inlet pipe. The air inlet pipe is connected to an air source through an air pipe. The air pipe is provided with a check valve and an air intake regulating valve in sequence from the air source to the air inlet pipe.

[0014] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the jet mixing device includes a liquid flow pipe and an air inlet pipe, and the cavity of the liquid flow pipe includes, from the liquid flow inlet end to the liquid flow outlet end, a jet acceleration section, a flow stabilizing throat section, and a diffusion mixing section in sequence;

[0015] The diameter of the jet acceleration section gradually narrows from the liquid inlet end; the flow stabilizing throat section is of constant diameter and its diameter is larger than that of the end of the jet acceleration section; the diameter of the diffusion mixing section gradually widens from the liquid outlet end and its initial diameter is the same as that of the flow stabilizing throat section.

[0016] The liquid flow pipe is provided with a negative pressure annular air chamber at the rear of the jet acceleration section. The air inlet pipe is vertically connected to the liquid flow pipe and is connected to the negative pressure annular air chamber. The connection between the jet acceleration section and the flow stabilizing throat section is staggered to form an air chamber opening that connects to the negative pressure annular air chamber.

[0017] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the inner ring wall of the negative pressure annular gas cavity is a conical surface whose outer diameter gradually decreases from the liquid inlet end to the liquid outlet end of the liquid flow tube, and the outer ring wall of the negative pressure annular gas cavity is a cylindrical surface.

[0018] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: an ozone generator is provided at the air source end of the air intake pipe, and the ozone generated by the ozone generator is drawn into the jet mixing device.

[0019] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is: it further includes a pipeline electrolysis device located between the jet mixing device and the sedimentation tank;

[0020] The pipeline electrolysis device includes a shell, electrolysis chamber partitions spaced apart from each other, and anode plates and cathode plates spaced apart from each other within the shell. The anode plates and cathode plates are supported by the electrolysis chamber partitions to divide the inner cavity of the shell into multiple electrolysis chambers.

[0021] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a vertical flow stabilizing plate is provided in the inclined plate separation zone, extending upward from the upper end of the inclined settling plate. The vertical flow stabilizing plate and the inclined settling plate are integrally formed into a purification plate. The inclined plate separation zone is divided into a flow stabilizing section in the area where the vertical flow stabilizing plate is located and a settling section in the area where the inclined settling plate is located. The liquid outlet is located in the flow stabilizing section.

[0022] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problem is: a cutting fluid purification and recovery method, which is completed by the cutting fluid recycling and treatment system, and includes the following steps in sequence:

[0023] Step A: The mixture to be treated enters the basket filter through the inlet pipe, and the mixture after primary treatment by the basket filter enters the hydrocyclone device.

[0024] Step B: The hydrocyclone device separates heavy and light components through the cyclone separator and vortex separation component. Some of the oil in the mixture overflows from the oil outlet of the hydrocyclone device into the oil phase pipe, and some metal chips settle into the chip collection chamber and are discharged from the system. The mixture that has completed the secondary treatment flows out of the hydrocyclone device and into the jet mixing device.

[0025] Step C: The jet mixing device draws in gas to form a micro vortex, dissolves the gas into the liquid phase, and forms bubbles to adhere to impurities and oil stains, thus achieving three-stage treatment;

[0026] Step D: The mixture processed in the previous step enters the settling tank. Air bubbles adhering to impurities and oil float to the surface through the flotation zone, forming scum that overflows into the oil discharge tank. Larger particles not adhering to the air bubbles settle on the surface of the inclined settling plate in the inclined plate separation zone as they flow downward with the liquid, accumulating and then sliding into the scum hopper area. The mixture is then discharged from the outlet and recycled after passing through the five-stage treatment in the settling tank.

[0027] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problem is as follows: when a pipeline electrolysis device is provided between the jet mixing device and the sedimentation tank, step E is further included between step C and step D;

[0028] Step E: The mixture after three-stage treatment by the jet mixing device passes through the electrolysis chamber of the pipeline electrolysis device. The electric field oxidizes and sterilizes it, while releasing micro-nano bubbles to further adsorb impurities and oil, thus achieving four-stage treatment of the mixture.

[0029] Compared with the prior art, the advantages of the present invention are: the system gradually removes solid particles, oil and microorganisms from the cutting fluid through multi-stage series processing, thereby achieving efficient purification and recycling of the cutting fluid, extending the service life of the cutting fluid, realizing metal recovery, and reducing waste liquid treatment costs. Attached Figure Description

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0031] Figure 1 This is a schematic diagram of the overall cutting fluid recycling and treatment system;

[0032] Figure 2 This is a side perspective view of the tank body of the cutting fluid recycling system.

[0033] Figure 3 This is a schematic diagram of a local system before the settling tank in a cutting fluid recycling and treatment system.

[0034] Figure 4 A schematic diagram of a hydrocyclone device for a cutting fluid recycling and treatment system;

[0035] Figure 5 A cross-sectional view of the jet mixing device in a cutting fluid recycling and treatment system;

[0036] Figure 6 This is a cross-sectional view of a pipeline electrolysis unit in a cutting fluid recycling system.

[0037] Figure label:

[0038] 1. Inlet pipe; 2. Basket filter; 3. Hydrocyclone device; 4. Jet mixing device; 5. Pipeline electrolysis device; 6. Settling tank; 31. Outer cylinder; 32. Swirl generator; 33. Vortex separation assembly; 331. Vortex blades; 61. Tank body; 601. Air flotation zone; 602. Inclined plate separation zone; 603. Slag hopper zone; 62. Oil discharge trough; 63. Inclined settling plate; 64. Outlet; 20. Basket filter; 35. Oil outlet fixing plate; 36. Liquid outlet fixing plate; 37. Oil discharge chamber; 38. Inlet chamber. 8; Drainage chamber 39; Chip collection chamber 34; Guide tube 332; Cylindrical chamber 391; Conical transition chamber 392; Liquid flow pipe 401; Air inlet pipe 402; Inner ring wall 40; Jet acceleration section 41; Flow stabilizing throat section 42; Diffusion mixing section 43; Negative pressure annular air chamber 44; Air chamber opening 45; Check valve 403; Intake volume regulating valve 404; Shell 51; Partition plate 52; Anode plate 53; Cathode plate 54; Electrolysis chamber 50; Vertical flow stabilizing plate 65; Purification plate 600. Detailed Implementation

[0039] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of the invention.

[0040] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it will not be further defined and explained in subsequent figures.

[0041] In the description of this invention, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the die-cast parts of this invention are used. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] like Figure 1-3 As shown, this embodiment provides a cutting fluid recycling system, which includes, in sequence, an inlet pipe 1, a basket filter 2, a hydrocyclone device 3, a jet mixing device 4, a pipeline electrolysis device 5, and a settling tank 6 connected in series.

[0043] like Figure 4 As shown, the hydrocyclone device 3 includes an outer cylinder 31, a cyclone separator 32, and a vortex separation assembly 33. The vortex separation assembly 33 is disposed below the cyclone separator 32, and the inner cavity of the outer cylinder 31 forms a chip collection cavity 34 below it. The vortex blades 331 of the vortex separation assembly 33 are curved surfaces that are inclined from bottom to top and have convex surfaces facing outwards, and their extension direction is set at an acute angle to the circumferential tangent.

[0044] like Figure 1-2 As shown, the settling tank 6 includes a tank body 61, which, from top to bottom, includes an air flotation zone 601, an inclined plate separation zone 602, and a slag hopper zone 603. The air flotation zone 601 is equipped with an oil discharge trough 62, and the inclined plate separation zone 602 is equipped with parallel and spaced-apart inclined settling plates 63. The inclined plate separation zone 602 is equipped with a liquid outlet 64 whose height is lower than that of the oil discharge trough 62.

[0045] like Figure 1-6 As shown, based on this cutting fluid recycling system, this embodiment also provides a cutting fluid purification and recovery method, which specifically includes the following steps.

[0046] Step A: The mixture to be treated enters the basket filter device 2 through the inlet pipe 1. After primary treatment by the basket filter device 2, the mixture enters the hydrocyclone device 3. The basket filter device 2 includes a filter basket. After the mixture passes through the filter basket, larger solid particles are intercepted, which can prevent subsequent equipment from clogging. Larger metal particles can also be recovered by extracting and cleaning the filter basket.

[0047] Step B: The hydrocyclone device 3 separates the heavy and light components of the mixture through the hydrocyclone 32 and the vortex separation component 33. Some of the oil in the mixture overflows from the oil outlet of the hydrocyclone device 3 into the oil phase pipeline, and some metal chips settle into the chip collection chamber 34 and are discharged from the system. The mixture that has completed the secondary treatment flows out of the hydrocyclone device 3 and enters the jet mixing device 4.

[0048] The specific process is as follows: The contaminated cutting fluid to be treated is injected into the inlet chamber 38 of the outer cylinder 31, forming an initial rotation. Under the action of centrifugal force, large particles and high-density impurities, such as larger metal shavings and abrasive grains, are quickly thrown towards the cylinder wall and spiral down along the wall surface, eventually being discharged from the slag discharge port located at the bottom of the inlet chamber 38, achieving the first coarse separation. The remaining mixture of cutting fluid, oil, and small metal shavings, as the light phase, is guided to the inlet of the cyclone 32 in the upper section of the cyclone 32.

[0049] After the mixture enters the cyclone separator 32, it is accelerated to form a high-speed, strong vortex. In the powerful centrifugal force field, the heavy components—cutting fluid and metal chips—are thrown against the conical wall of the cyclone separator 32 and move downwards. Meanwhile, the light components—oil and air—form a low-pressure vortex core in the central axis region. Under the action of the pressure difference, this vortex core carries oil droplets upwards and eventually overflows from the oil outlet at the top, achieving oil-water separation.

[0050] After being degreased by the hydrocyclone 32, the liquid flow, mainly composed of cutting fluid and metal chips, exits at high speed from the outlet of the hydrocyclone 32 and enters the vortex separation component 33, where it is decelerated and separated. The mixture is further lifted to the position of the vortex blade 331. Since the spiral direction of the counter-inclined curved blade is similar to the rotation path of the mixture, a downward guiding channel is formed. This channel guides and decelerates the high-speed swirling liquid, and guides the particles and metal chips that migrate to the cylinder wall due to their higher specific gravity than the liquid phase and centrifugal force downward into the chip collection chamber 34. The further purified mixture then flows out of the hydrocyclone device 3 and into the jet mixing device 4.

[0051] Step C: The jet mixing device 4 draws in gas to form a micro vortex, dissolves the gas into the liquid phase, and forms bubbles to adhere to impurities and oil stains, thus achieving three-stage treatment.

[0052] In this step, the system utilizes the high residual pressure of the hydrocyclone device 3 to introduce the mixture into the jet mixer. Taking advantage of the reduced flow area, increased water velocity, and sudden pressure drop in the jet mixer 4, which creates a negative pressure chamber, gas is drawn in. As the flow area expands forward, the reduced flow velocity creates numerous micro-vortices, ensuring thorough gas-liquid mixing and contact, with the gas dissolving into the liquid phase. These gases then form bubbles that adhere to impurities and oil in the liquid phase, purifying the cutting fluid and achieving air flotation pretreatment.

[0053] Step E: The mixture after three-stage treatment by the jet mixing device 4 passes through the electrode plate of the pipeline electrolysis device 5. The electric field oxidizes and sterilizes it, while releasing micro-nano bubbles to further adsorb impurities and oil stains, thus achieving four-stage treatment of the mixture.

[0054] Specifically, when the liquid phase penetrates the electrode plate assembly, the electric field formed by the positive and negative plates directly oxidizes and sterilizes the fluid. The neutralization effect of the electric field destabilizes the colloids in the cutting fluid, making them easier to separate by flotation or sedimentation. Simultaneously, oxygen is evolved at the anode and hydrogen at the cathode, and the gas generated by electrolysis is in a micro-nano state, increasing the gas phase capacity in the cutting fluid. This provides a larger gas-liquid ratio and more uniform micro-nano bubbles for subsequent flotation separation, enabling the adhesion and separation of finer and more numerous dust, particulate matter, and oily waste. The incoming liquid carrying microbubbles after passing through the jet mixing device 4 forms a multi-dimensional electrode effect in the electric field, resulting in higher electrolytic mass transfer efficiency.

[0055] Step D: The mixture after four stages of treatment enters the settling tank 6. Air bubbles adhering to impurities and oil float to the surface in the flotation zone 601, forming scum that overflows into the oil discharge tank 62. Larger particles not adhering to the air bubbles settle on the surface of the inclined settling plates 63 in the inclined plate separation zone 602 as the liquid flows downwards, accumulating and then sliding into the slag hopper zone 603. The mixture, after five stages of treatment in the settling tank 6, flows out from the outlet 64 and is recycled.

[0056] Specifically, the mixture after four stages of treatment typically enters the dissolved air-water release zone of the settling tank after passing through a dissolved air-water release zone. It is distributed in the lower part of the tank via porous release pipes, then flows upwards and enters the settling tank 6 through the distribution holes at the top of the baffle 52. Oily waste, dust, and fine particulate pollutants are adhered to by large air bubbles and float to the surface, forming scum. Heavier particles not adhered to by air bubbles settle on the surface of the inclined settling plate 63 as the liquid flows downwards, accumulating to a certain thickness before sliding down to the bottom scum hopper. Oil and gas aggregates adhered to by nanobubbles, due to their slow upward movement, rise and accumulate on the back of the inclined settling plate 63 as the liquid flows downwards, moving upwards along the back of the plate and agglomerating until they finally float to the surface, forming scum. When the scum reaches a certain thickness, it overflows into the oil discharge tank 62.

[0057] In summary, the system uses multi-stage series processing to gradually remove solid particles, oil, and microorganisms from the cutting fluid, achieving efficient purification and recycling of the cutting fluid, extending its service life, recovering metal, and reducing waste fluid treatment costs. Alternatively, the system can omit the pipeline electrolysis device 5, thus omitting step E and proceeding directly from step C to step D.

[0058] like Figure 3 As shown, the basket filter device 2 includes two basket filters 20 connected in parallel. The inlets of the two basket filters 20 are connected to the same inlet pipe 1, and the outlets of the two basket filters 20 are connected to the hydrocyclone device 3 through the same pipe. Each filter operates independently, and their outlets merge before entering the hydrocyclone device 3. This parallel design not only shares the filtration load, extends the basket cleaning cycle, and reduces maintenance frequency, but also improves system reliability and continuity. When one filter is clogged or under maintenance, the other can continue to operate, avoiding downtime losses. It also allows for online cleaning or replacement of the basket via valve switching, ensuring uninterrupted system operation.

[0059] like Figure 4 As shown, the cyclone separator 32 is axially fixed in the inner cavity of the outer cylinder 31 by the oil outlet fixing plate 35 and the liquid outlet fixing plate 36, respectively. The inner cavity of the outer cylinder 31 is divided into an oil discharge chamber 37, a liquid inlet chamber 38, a water discharge chamber 39, and a chip collection chamber 34 by the oil outlet fixing plate 35, the liquid outlet fixing plate 36, and the vortex separation assembly 33.

[0060] like Figure 4As shown, the vortex separation assembly 33 includes a cylindrical guide tube 332. The outer ends of each vortex blade 331 are fixed to the inner wall of the outer tube 31, and the inner ends are fixed to the guide tube 332. The lower end of the vortex generator 32 is located in the inner hole of the guide tube 332. Adjacent vortex blades 331 are separated in the axial direction and projected to overlap in the circumferential direction.

[0061] After being deoiled by the cyclone separator 32, the fluid, mainly composed of cutting fluid and metal chips, is swirled out at high speed and enters the guide tube 332 of the vortex separator assembly 33. The guide tube 332 further guides the fluid at the outlet end circumferentially, maintaining its swirling state while reducing its speed. After the fluid flow slows down, the centrifugal force on the metal chips it carries weakens, and they begin to settle under their own gravity. Meanwhile, another portion of the mixture of cutting fluid and even smaller metal chips is further lifted to the position of the vortex blades 331.

[0062] like Figure 4 As shown, the diameter of the chip collection chamber 34 is larger than that of the upper drainage chamber 39. The larger diameter of the chamber causes the flow velocity of the incoming fluid to drop sharply, creating ideal conditions for the final settling of metal chips. The metal chips accumulate here and can be discharged by periodically opening the bottom aluminum discharge valve.

[0063] Preferably, such as Figure 4 As shown, the drainage chamber 39 includes, from top to bottom, a cylindrical chamber 391 with the same diameter as the liquid inlet chamber 38 and a conical transition chamber 392 with an inner diameter that gradually increases from top to bottom.

[0064] The conical transition cavity 392 not only smoothly transitions between the two functional cavities, but its inclined inner wall also physically blocks metal shavings attempting to rise, forcing them to slide downwards and further enhancing the separation effect. The purified water then enters the next step, the jet mixing device 4, from the outlet located on the cylindrical cavity 391 side. Furthermore, the larger inner diameter cavity has higher pressure and lower flow velocity, while the smaller inner diameter cavity has lower pressure and higher flow velocity, thus facilitating the migration of cutting fluid to the drainage cavity 39 and its overflow from the outlet on the cylindrical cavity 391 side.

[0065] like Figure 5 As shown, the jet mixing device 4 includes a liquid flow pipe 401 and an air inlet pipe 402. The cavity of the liquid flow pipe 401 includes, from the liquid flow inlet end to the liquid flow outlet end, a jet acceleration section 41, a flow stabilizing throat section 42, and a diffusion mixing section 43.

[0066] The diameter of the jet acceleration section 41 gradually narrows from the liquid inlet end. The flow stabilizing throat section 42 is of constant diameter and its diameter is larger than that of the end of the jet acceleration section 41. The diameter of the diffusion mixing section 43 gradually widens from the liquid outlet end, and its initial diameter is the same as that of the flow stabilizing throat section 42.

[0067] The liquid flow pipe 401 is provided with a negative pressure annular air chamber 44 at the rear of the jet acceleration section 41. The air inlet pipe 402 is vertically connected to the liquid flow pipe 401 and is connected to the negative pressure annular air chamber 44. The jet acceleration section 41 and the flow stabilizing throat section 42 are staggered at the connection point to form an air chamber opening 45 that connects to the negative pressure annular air chamber 44.

[0068] As the liquid enters the jet acceleration section 41, the pipe diameter narrows, the flow velocity increases, and the pressure decreases, creating a negative pressure at the air chamber opening 45 at the end of the jet acceleration section 41. Gas enters the negative pressure annular air chamber 44 through the inlet pipe 402 and is drawn into the liquid flow through the air chamber opening 45. In the steady flow throat section 42, the gas-liquid mixture is stable; in the diffusion mixing section 43, the pipe diameter widens, the flow velocity decreases, and the pressure rises again, causing bubbles to be sheared and compressed into microbubbles, improving the air flotation effect. The staggered design of the air chamber opening 45 avoids direct fluid impact and improves gas entrainment efficiency.

[0069] like Figure 3 , 5 As shown, the intake pipe 402 is connected to the air source via an air pipe. From the air source to the intake pipe 402, a check valve 403 and an intake flow regulating valve 404 are sequentially installed. The high-speed flowing liquid in the liquid flow pipe 401 generates negative pressure in the injection section, drawing in gas through the intake pipe 402. The check valve 403 ensures unidirectional gas flow, preventing backflow of cutting fluid. The intake flow regulating valve 404 adjusts the gas flow rate by changing its opening, thereby controlling the bubble diameter and enhancing the adhesion between the bubbles and oil contaminants.

[0070] like Figure 3 , 5 As shown, the inner ring wall 40 of the negative pressure annular gas chamber 44 is a conical surface whose outer diameter gradually decreases from the liquid inlet end to the liquid outlet end of the liquid flow pipe body 401, while the outer ring wall of the negative pressure annular gas chamber 44 is a cylindrical surface. The conical design of the inner ring wall ensures continuous liquid flow from the jet acceleration section 41 to the steady flow throat section 42, avoiding eddies caused by sudden expansion and maintaining stability in the negative pressure region.

[0071] like Figure 3 , 5 As shown, an ozone generator is installed at the air source end of the air intake pipe 402, and the ozone generated by the ozone generator is drawn into the jet mixing device 4. The ozone is drawn into the jet mixing device 4 through the air intake pipe 402 and dissolved in the liquid, creating reaction conditions for sterilization and deodorization, that is, using residual pressure to achieve the purpose of dissolving gas and mixing sterilizing agents.

[0072] like Figure 6As shown, the pipeline electrolysis device 5 includes a shell 51, electrolysis chamber partitions 52 spaced apart from each other, and anode plates 53 and cathode plates 54 spaced apart within the shell 51. The anode plates 53 and cathode plates 54 are supported by the electrolysis chamber partitions 52 to divide the inner cavity of the shell 51 into multiple electrolysis chambers 50. After energization, an oxidation reaction occurs at the anode, producing oxidizing substances such as hydroxyl radicals, which decompose organic matter and sterilize; a reduction reaction occurs at the cathode, producing hydrogen microbubbles that adsorb impurities. The electrolysis chamber partitions 52 guide the fluid to meandering, increasing the residence time and improving the reaction efficiency.

[0073] like Figure 1 , 2 As shown, the inclined plate separation zone 602 is equipped with a vertical flow stabilizing plate 65 extending upward from the upper end of the inclined settling plate 63. The vertical flow stabilizing plate 65 and the inclined settling plate 63 are integrally formed into a purification plate 600. The inclined plate separation zone 602 is divided into a flow stabilizing section where the vertical flow stabilizing plate 65 is located and a settling section where the inclined settling plate 63 is located. The liquid outlet 64 is located in the flow stabilizing section. The liquid outlet 64 is a strip-shaped liquid outlet channel, and the liquid outlet channel and the oil discharge channel 62 are located on opposite sides of the settling tank 6 spanned by the purification plate. The purification plate divides the settling tank 6 into multiple channels. The vertical flow stabilizing plate 65 guides the water flow vertically downward, smoothly transitioning to the settling section. In the settling section, particles settle on the surface of the inclined settling plate 63. The vertical flow stabilizing plate 65 can stabilize the water flow, reduce the interference of turbulence on settling, and improve settling efficiency. The liquid outlet 64 is located in the flow stabilizing section to ensure that the outflowing liquid is a clear liquid and to avoid resuspension of settled particles. The oil outlet tank is located on one side of the flotation zone 601 to collect floating oil; the liquid outlet tank is located on the opposite side to collect clarified liquid. This layout achieves spatial isolation between oil and water, avoiding cross-contamination.

[0074] This article uses specific examples to describe the cutting fluid recycling and treatment system and purification and recovery method provided by the present invention. The description of the above embodiments is only for the purpose of helping to understand the present invention and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A cutting fluid recycling and treatment system, characterized in that: It includes, in sequence, an inlet pipe, a basket filter, a hydrocyclone device, a jet mixing device, and a sedimentation tank connected in series; The hydrocyclone device includes an outer cylinder, a cyclone separator, and a vortex separation assembly. The vortex separation assembly is located below the cyclone separator and forms a debris collection chamber below the inner cavity of the outer cylinder. The vortex separation assembly includes a cylindrical guide tube and vortex blades. The outer end of each vortex blade is fixed to the inner wall of the outer cylinder, and the inner end is fixed to the guide tube. The lower end of the cyclone separator is located in the inner hole of the guide tube. The vortex blades are curved surfaces that are inclined from bottom to top with the convex surface facing outward, and the extension direction is set at an acute angle to the circumferential tangent. Adjacent vortex blades are separated in the axial direction and projected to overlap in the circumferential direction. The sedimentation tank includes a tank body, which from top to bottom includes an air flotation zone, an inclined plate separation zone, and a slag hopper zone; The air flotation zone is equipped with an oil drain trough, and the inclined plate separation zone is equipped with mutually spaced and parallel inclined settling plates; the inclined plate separation zone is equipped with a liquid outlet with a height lower than that of the oil drain trough. The inclined plate separation zone is provided with a vertical flow stabilizing plate extending upward from the upper end of the inclined settling plate. The vertical flow stabilizing plate and the inclined settling plate are integrally formed into a purification plate. The inclined plate separation zone is divided into a flow stabilizing section where the vertical flow stabilizing plate is located and a settling section where the inclined settling plate is located. The liquid outlet is located in the flow stabilizing section.

2. The cutting fluid recycling system according to claim 1, characterized in that: The basket filter device includes two basket filters connected in parallel. The inlets of the two basket filters are connected to the same inlet pipe, and the outlets of the two basket filters are connected to the hydrocyclone device through the same pipe.

3. The cutting fluid recycling system according to claim 1, characterized in that: The jet mixing device includes a liquid flow pipe and an air inlet pipe. The air inlet pipe is connected to an air source through an air pipe. The air pipe is provided with a check valve and an air intake regulating valve in sequence from the air source to the air inlet pipe.

4. The cutting fluid recycling and treatment system according to claim 1, characterized in that: The jet mixing device includes a liquid flow pipe and an air inlet pipe. The cavity of the liquid flow pipe includes, from the liquid inlet end to the liquid outlet end, a jet acceleration section, a flow stabilizing throat section, and a diffusion mixing section in sequence. The diameter of the jet acceleration section gradually narrows from the liquid inlet end; the flow stabilizing throat section is of constant diameter and its diameter is larger than that of the end of the jet acceleration section; the diameter of the diffusion mixing section gradually widens from the liquid outlet end and its initial diameter is the same as that of the flow stabilizing throat section. The liquid flow pipe is provided with a negative pressure annular air chamber at the rear of the jet acceleration section. The air inlet pipe is vertically connected to the liquid flow pipe and is connected to the negative pressure annular air chamber. The connection between the jet acceleration section and the flow stabilizing throat section is staggered to form an air chamber opening that connects to the negative pressure annular air chamber.

5. The cutting fluid recycling system according to claim 4, characterized in that: The inner ring wall of the negative pressure annular gas cavity is a conical surface whose outer diameter gradually decreases from the liquid inlet end to the liquid outlet end of the liquid flow tube, and the outer ring wall of the negative pressure annular gas cavity is a cylindrical surface.

6. The cutting fluid recycling system according to claim 3, characterized in that: An ozone generator is installed at the air source end of the air intake pipe, and the ozone generated by the ozone generator is drawn into the jet mixing device.

7. The cutting fluid recycling system according to claim 1, characterized in that: It also includes a pipeline electrolysis device located between the jet mixing device and the settling tank; The pipeline electrolysis device includes a shell, electrolysis chamber partitions spaced apart from each other, and anode plates and cathode plates spaced apart from each other within the shell. The anode plates and cathode plates are supported by the electrolysis chamber partitions to divide the inner cavity of the shell into multiple electrolysis chambers.

8. A method for purifying and recovering cutting fluid, characterized in that... This is accomplished by the cutting fluid recycling system according to any one of claims 1-7, comprising the following steps in sequence: Step A: The mixture to be treated enters the basket filter through the inlet pipe, and the mixture after primary treatment by the basket filter enters the hydrocyclone device. Step B: The hydrocyclone device separates heavy and light components through the cyclone separator and vortex separation component. Some of the oil in the mixture overflows from the oil outlet of the hydrocyclone device into the oil phase pipe, and some metal chips settle into the chip collection chamber and are discharged from the system. The mixture that has completed the secondary treatment flows out of the hydrocyclone device and into the jet mixing device. Step C: The jet mixing device draws in gas to form a micro vortex, dissolves the gas into the liquid phase, and forms bubbles to adhere to impurities and oil stains, thus achieving three-stage treatment; Step D: The mixture processed in the previous step enters the settling tank. Air bubbles adhering to impurities and oil float to the surface through the flotation zone, forming scum that overflows into the oil discharge tank. Larger particles that are not adhered to by air bubbles settle on the surface of the inclined settling plate in the inclined plate separation zone as they flow downward with the liquid flow, and after accumulation, slide down into the scum hopper area. The mixture is then discharged from the outlet and recycled after passing through the five-stage treatment in the settling tank.

9. The cutting fluid purification and recovery method according to claim 8, characterized in that... When a pipeline electrolysis device is installed between the jet mixing device and the settling tank, step E is also included between step C and step D. Step E: The mixture after three-stage treatment by the jet mixing device passes through the electrolysis chamber of the pipeline electrolysis device. The electric field oxidizes and sterilizes it, while releasing micro-nano bubbles to further adsorb impurities and oil, thus achieving four-stage treatment of the mixture.

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