A multi-stage purification device for blackened cutting oil

Abstract

The utility model discloses a multistage purification device of blackening cutting oil, aims at solving the problem that prior art cannot make blackening cutting oil restore light and transparent state. The device includes device body, and the body is equipped with metal impurity separation cabin, oxidation product adsorption cabin, microbial inhibition cabin in proper order along the cutting oil flow direction, and the liquid inlet is connected with the metal impurity separation cabin, and the clean liquid mouth is connected with the microbial inhibition cabin, and the cabins are connected in series through the flow limiting valve and the communicating pipe, and the control box is arranged on the outside of the body. The metal impurity separation cabin is three sub-cavities, and is equipped with collecting basket, magnetic roller and scrap plate; the oxidation product adsorption cabin is equipped with detachable composite adsorption assembly and observation window; the microbial inhibition cabin is equipped with ultraviolet sterilization module and labyrinth spoiler. The device targets to remove blackening factors, can restore the light and transparent appearance and performance of cutting oil, and is stable in operation and convenient to maintain.

Description

Technical Field

[0001] This utility model relates to cutting fluid treatment equipment in the field of machining, specifically to a multi-stage purification device for blackened cutting oil. Background Technology

[0002] During machining, cutting oils, after long-term recycling, are prone to gradually darkening in color due to factors such as the incorporation of metal debris, the formation of dark-colored products from oxidation, and the accumulation of microbial metabolites. This not only affects their cooling and lubrication performance but also reduces the feasibility of recycling. Restoring darkened cutting oils to a light and clear state is a key requirement for extending their service life and reducing consumable costs for enterprises.

[0003] In the prior art, the "cutting oil recovery device" with announcement number CN212858746U removes solid impurities such as iron filings through multi-stage filtration and magnetic adsorption, which improves the cleanliness of cutting oil to a certain extent. However, this technology does not treat oxidation products (such as aldehydes and ketones) and microbial metabolites that cause the oil to turn black. The purified cutting oil is still difficult to restore to a light and clear state due to the residual dark components.

[0004] Another announcement, CN221964720U, describes a "cutting oil filtration system" that improves the stability of cutting oil through temperature control and basic filtration. However, its filtration accuracy is limited, and it cannot effectively remove fine suspended impurities and soluble dark-colored substances. Furthermore, it does not involve a special treatment module for oil that has turned black, making it difficult to achieve the core goal of making the blackened cutting oil lighter and clearer.

[0005] Therefore, existing technologies have limitations in solving the problem of cutting oil turning black. They fail to effectively cover the key factors that cause discoloration and cannot restore the blackened cutting oil to a light and clear state. There is an urgent need for a purification device specifically designed to address the problem of oil discoloration, to fill this technological gap. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies that cannot restore blackened cutting oil to a light and clear state. It provides a multi-stage purification device for blackened cutting oil, which specifically removes metallic impurities, oxidation products, and microbial metabolites that cause the oil to turn black, thereby restoring the appearance and basic properties of the blackened cutting oil and extending its recycling cycle.

[0007] To achieve the above objectives, this utility model adopts a "tiered targeted purification" technical approach, designing a synergistic treatment structure for different blackening causes. The specific solution is as follows: A multi-stage purification device for blackening cutting oil includes a device body. Within the device body, along the flow direction of the cutting oil, a metal impurity separation chamber, an oxidation product adsorption chamber, and a microbial inhibition chamber are sequentially arranged. An inlet is located near the top left rear side of the device body, communicating with the metal impurity separation chamber. A purified liquid outlet is located near the bottom right front side of the device body, communicating with the microbial inhibition chamber. The metal impurity separation chamber and the oxidation product adsorption chamber are connected in series via a front flow-limiting valve and a front connecting pipe. The oxidation product adsorption chamber and the microbial inhibition chamber are connected in series via a rear flow-limiting valve and a rear connecting pipe. A control box is located on the outside of the device body.

[0008] Furthermore, the metal impurity separation chamber is divided into three sub-cavities from back to front. The liquid inlet is located in the rear sub-cavity. Overflow outlets are located at the top of the partition between the rear and middle sub-cavities and at the top of the partition between the middle and front sub-cavities, respectively. A coarse slag collection basket is hung in the rear sub-cavity, a fine slag collection basket is hung in the middle sub-cavity, and a suspended micro-slag catcher is provided in the front sub-cavity. The suspended micro-slag catcher includes at least one magnetic roller mounted on the top of the front sub-cavity and one free roller mounted on the top of the front sub-cavity. The lower part of the magnetic roller is submerged in the cutting oil and can rotate independently. The gap between the free roller and the magnetic roller is adjustable. A slag discharge trough is fixed at the front of the front sub-cavity, and an elastic scraper is provided behind the slag discharge trough. The scraper is in contact with the surface of the magnetic roller.

[0009] Furthermore, both ends of the magnetic roller are rotatably connected to the front sub-cavity sidewall via bearing seats, and one end extends through the front sub-cavity sidewall and is connected to the drive motor for transmission.

[0010] Furthermore, a guide groove is fixedly provided on the side wall of the front sub-cavity, with the longitudinal direction of the guide groove along the radial direction of the magnetic roller. A fixed seat is fixedly provided on the side wall of the front sub-cavity at the upper end of the guide groove. The guide groove is slidably fitted with a guide rod, which is connected to the rotating shaft of the free roller and fixedly connected to the lower end of the screw. The upper end of the screw passes through the fixed seat and is tightened by two nuts.

[0011] Furthermore, the left and right side walls of the oxidation product adsorption chamber are provided with one or more sets of slots, and a composite adsorption component is inserted into each set of slots. The composite adsorption component includes a detachable frame and a porous filter layer and an adsorption layer fixed in the frame. The porous filter layer is located upstream, i.e., close to the front connecting pipe, and the adsorption layer is located downstream, i.e., close to the rear connecting pipe. The side wall of the oxidation product adsorption chamber is provided with a transparent observation window, which is arranged along the height direction of the chamber.

[0012] Furthermore, the detachable frame is equipped with sliders on both sides, and the inner wall of the oxidation product adsorption chamber is equipped with corresponding slide rails. The frame is detachably connected by sliding cooperation between the sliders and the slide rails; the height of the transparent observation window is not less than 2 / 3 of the height of the oxidation product adsorption chamber.

[0013] Furthermore, the microbial inhibition chamber is equipped with multiple ultraviolet sterilization modules, each of which includes a lamp tube and a waterproof sleeve covering the outside of the lamp tube, the waterproof sleeve being submerged in the cutting oil.

[0014] Furthermore, the bottom of the microbial inhibition chamber is provided with several flow deflectors, which are arranged in a labyrinthine pattern along the direction of cutting oil flow and are fixed vertically to the bottom of the chamber; the ultraviolet sterilization modules are evenly distributed, with a spacing of 150-250mm between adjacent modules; the height of the flow deflectors is 1 / 3-1 / 2 of the cutting oil level in the microbial inhibition chamber, and the spacing between adjacent flow deflectors is 100-150mm.

[0015] Furthermore, the control box is equipped with a power switch and corresponding operation indicator lights for each compartment, and has a timer controller that is electrically connected to the ultraviolet sterilization module inside.

[0016] Furthermore, the diameters of the front and rear connecting pipes are 50-80mm, and the front and rear flow limiting valves are manually adjustable ball valves; both the inlet and the outlet are equipped with flange interfaces.

[0017] The beneficial technical effects of this utility model are as follows: 1. Targeted solutions address the core causes of cutting oil blackening, restoring both appearance and performance. This device employs a multi-stage synergistic structure of "metal impurity separation—oxidation product adsorption—microbial inhibition" to precisely target and address three key factors that cause cutting oil to darken: the metal impurity separation chamber removes metal debris of different particle sizes in stages, reducing the impact of impurities on the oil's dark color; the oxidation product adsorption chamber specifically adsorbs dark-colored oxidized substances such as aldehydes and ketones, improving the oil's darkening problem at its source; and the microbial inhibition chamber inhibits microbial metabolism, preventing its products from causing secondary discoloration of the oil. Ultimately, this device helps the darkened cutting oil regain its light and clear appearance while reducing the loss of cooling and lubrication performance caused by impurities, oxidation products, and microorganisms.

[0018] 2. Highly efficient separation of metal impurities and less prone to secondary pollution. The metal impurity separation chamber adopts a three-stage progressive processing design: the collection baskets in the rear and middle sub-cavities can respectively intercept coarse and fine particulate impurities, preventing large particulate impurities from clogging subsequent structures; the suspended micro-slag catcher in the front sub-cavity uses magnetic rollers to adsorb fine magnetic impurities, and in conjunction with the elastic scraper, automatically cleans the impurities on the roller surface and guides them into the slag discharge trough, eliminating the need for frequent manual disassembly and cleaning, reducing the risk of secondary pollution from impurities falling back into the oil; and the gap between the free rollers and the magnetic rollers is adjustable, which can adapt to the micro-slag adsorption requirements under different working conditions, improving the flexibility of impurity separation.

[0019] 3. Oxidation products are easily adsorbed and suitable for maintenance needs. The composite adsorption component of the oxidation product adsorption chamber adopts a dual-layer structure of "porous filter layer + adsorption layer". The upstream filter layer can first intercept colloidal impurities to avoid affecting the adsorption effect of the downstream adsorption layer on oxidation products. The adsorption component can be quickly pulled out and replaced through the cooperation of the detachable frame and slide rail. With the transparent observation window of the chamber wall, the status of the adsorption layer can be directly observed, which is convenient for timely replacement to maintain the adsorption effect, reduce the complexity of maintenance operations, and reduce the downtime of the device for maintenance.

[0020] 4. Sufficient microbial inhibition and ensure long-term oil stability. The ultraviolet sterilization module in the microbial inhibition chamber adopts a fully submerged design, combined with a labyrinth-style arrangement of baffles, which can guide the cutting oil to flow fully in the chamber, avoiding local stagnation of oil and thus preventing incomplete sterilization. The baffle structure prolongs the contact time between the oil and ultraviolet light, improves the sterilization coverage, effectively inhibits the reproduction of microorganisms and the generation of their metabolites, reduces problems such as odor and blackening of the oil caused by microbial activity, and extends the cycle of cutting oil reuse.

[0021] 5. The system is stable and easy to operate. The metal impurity separation chamber is connected in series with the subsequent chambers via flow limiting valves and connecting pipes. The flow rate of each chamber can be adjusted according to the degree of cutting oil contamination, avoiding overload of a single chamber from affecting the overall purification effect. The control box integrates operation indicator lights and timer controllers, which can display the working status of each chamber in real time, facilitating quick troubleshooting, and can also preset the running time of the ultraviolet sterilization module, reducing manual operation and improving the stability and convenience of the device operation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0024] Figure 3 This is a structural schematic diagram from another perspective of the present invention. Detailed Implementation

[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the paper. This orientation or positional relationship is only for the convenience of describing this utility model and simplifying the description, and does 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, and therefore should not be construed as a limitation of this utility model.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] like Figure 1-3 The illustrated multi-stage purification device for blackening cutting oil includes a device body 1. Inside the device body 1, along the flow direction of the cutting oil, there are sequentially arranged a metal impurity separation chamber 2, an oxidation product adsorption chamber 3, and a microbial inhibition chamber 4. A liquid inlet 11 is located near the top of the left rear side of the device body 1, and the liquid inlet 11 is connected to the metal impurity separation chamber 2. A clean liquid outlet 12 is located near the bottom of the right front side of the device body 1, and the clean liquid outlet 12 is connected to the microbial inhibition chamber 4. The metal impurity separation chamber 2 and the oxidation product adsorption chamber 3 are connected in series through a front flow limiting valve 5 and a front connecting pipe 6. The oxidation product adsorption chamber 3 and the microbial inhibition chamber 4 are connected in series through a rear flow limiting valve 7 and a rear connecting pipe 8. A control box 9 is located on the outside of the device body 1.

[0029] This embodiment achieves technical effects such as "targeted purification of blackened cutting oil, ensuring stable operation and convenient maintenance." Its core principle revolves around "multi-level targeted treatment + structural-functional synergy," with the specific design logic of each module as follows: I. Comprehensive Multi-Level Purification: Treating each layer according to its "blackening triggers" to achieve comprehensive purification. The device is arranged sequentially along the direction of cutting oil flow: a metal impurity separation chamber 2, an oxidation product adsorption chamber 3, and a microbial inhibition chamber 4. Its core principle is "stage-based targeted treatment based on the key causes of cutting oil blackening (metal impurities, oxidation products, and microbial metabolites)." First, physical impurities are removed through the metal impurity separation chamber 2 (metal debris can cause the oil to darken and hinder subsequent purification), clearing away "interference obstacles" for subsequent adsorption and sterilization. Then, the oxidation product adsorption chamber 3 is used to specifically remove chemical oxidation products (aldehydes and ketones are the core cause of oil blackening), directly solving the root cause of discoloration. Finally, the microbial inhibition chamber 4 inhibits the reproduction of biological microorganisms (microbial metabolism produces dark secretions, causing the oil to turn black again), ensuring the long-term stability of the purified oil.

[0030] The three-stage chambers are connected in series via front and rear connecting pipes, forming a complete process of "pretreatment - deep purification - stable protection" to avoid the problem of incomplete treatment by a single module.

[0031] II. Separation of Metal Impurities: "Overflow stratification + staged screening + self-cleaning" to avoid impurity residue and secondary pollution. The core principle of the metal impurity separation chamber 2 is "overflow-guided flow + physical sieving and grading + magnetic adsorption replenishment", which, combined with a self-cleaning structure, achieves efficient impurity removal. 1. Overflow stratified flow: The partition between the rear sub-cavity and the middle sub-cavity is equipped with an overflow port. After the cutting oil flows in from the inlet 11, it needs to slowly enter the next sub-cavity through the overflow port. During the slow flow, coarse particles (such as large iron filings) naturally settle to the rear coarse slag collection basket 22 due to gravity, while medium particles settle to the fine slag collection basket 23 in the middle sub-cavity. The principle is to "reduce the flow rate and provide sufficient settling time for impurities of different particle sizes". 2. Magnetic adsorption and replenishment: The lower part of the magnetic roller 241 in the front sub-cavity is submerged in the oil, which can adsorb the unsettled suspended micro-slag (especially magnetic metal particles). In conjunction with the adjustable gap free roller 242, it can further "squeeze / intercept" the micro-slag, ensuring that fine particles do not flow out with the oil. 3. Self-cleaning and prevention of secondary pollution: The elastic scraper plate is attached to the surface of the magnetic roller 241. When the magnetic roller rotates, it can automatically scrape off the adsorbed micro-slag and collect it through the slag discharge trough - without the need for manual disassembly and cleaning, avoiding impurities falling back into the oil during the cleaning process, and realizing a closed loop of "adsorption-cleaning-collection".

[0032] III. Adsorption of Oxidation Products: "Pre-blocking followed by adsorption + modular maintenance" to ensure efficient and sustainable adsorption. The core principle of the oxidation product adsorption chamber 3 is "physical interception pretreatment + chemical adsorption deep purification", coupled with modular design to ensure convenient maintenance: 1. "Interception followed by adsorption" coupled purification: In the composite adsorption component, the porous filter layer (upstream) first intercepts residual colloidal particles and fine impurities in the oil. If these substances directly contact the adsorption layer, they will clog the adsorption pores and reduce the adsorption efficiency. The subsequent adsorption layer (downstream) then captures aldehyde and ketone oxidation products through the adsorption of materials such as activated carbon and ion exchange resin. The principle is to "first remove 'interference substances' and then specifically adsorb 'blackening substances' to improve the utilization rate of the adsorption layer." 2. Modular + Visualized Maintenance: The composite adsorption component can be quickly pulled out and replaced by a "slider-rail" mechanism with slot 31; the transparent observation window in the chamber wall allows for direct observation of the color change of the adsorption layer (such as the color deepening after adsorption saturation). The principle is to "reduce the difficulty of replacement through structural design and accurately determine the timing of maintenance through visual monitoring", avoiding failure of the adsorption layer after saturation and affecting the purification effect.

[0033] IV. Microbial Inhibition: "Turbulent flow extends contact + full immersion sterilization" ensures thorough inhibition. The core principle of the microbial inhibition chamber 4 is "extended contact time + expanded sterilization coverage" to avoid secondary deterioration of the oil due to microbial residue. 1. Labyrinth-style turbulence extends the working time: The turbulence plates 42 at the bottom of the chamber are arranged in a labyrinthine manner along the direction of oil flow. The cutting oil needs to pass through multiple turbulence plates before it can flow to the clean liquid outlet 12. This design greatly extends the residence time of the oil in the chamber. The principle is to "give the oil more opportunities to come into contact with the ultraviolet sterilization module 41 and avoid 'rapid flow leading to incomplete sterilization'". 2. Full immersion UV sterilization: The waterproof sleeve of the UV sterilization module 41 is immersed in the cutting oil, which can directly irradiate the oil in all dimensions (instead of just surface irradiation). The principle is to "ensure that the ultraviolet light penetrates into the oil and kills the microorganisms hidden in the oil, avoiding local sterilization dead spots" and inhibiting the metabolic products of microorganisms from the source.

[0034] V. Stable System Operation: "Flow Control + Status Monitoring" ensures overall coordination and ease of operation. The device ensures stable operation through a "flow limiting valve + control box" design, with the core principle being "flow balancing + status visualization": 1. Load balancing with flow limiting valves: The front flow limiting valve 5 and the rear flow limiting valve 7 are manually adjustable ball valves. They can adjust the oil intake of each chamber according to the degree of cutting oil contamination (e.g., slow down the flow rate to give the separation chamber sufficient time if there are many impurities; speed up the flow rate to improve efficiency if there are few impurities). The principle is to "avoid purification failure due to flow overload in a single chamber and ensure the coordinated operation of the three chambers". 2. Convenient management through the control box: The operation indicator lights of the control box 9 can display the working status of each compartment in real time (such as whether the ultraviolet module is normal or overloaded), and the timer controller can preset the ultraviolet sterilization time - the principle is to "reduce the difficulty of troubleshooting through status visualization, reduce manual operation through timer control, and improve the convenience of operation".

[0035] In another preferred embodiment, the metal impurity separation chamber 2 is divided into three sub-cavities from back to front. The liquid inlet 11 is located in the rear sub-cavity. Overflow outlets 21 are respectively provided on the top of the partition between the rear sub-cavity and the middle sub-cavity, and on the top of the partition between the middle sub-cavity and the front sub-cavity. A coarse slag collection basket 22 is hung in the rear sub-cavity, and a fine slag collection basket 23 is hung in the middle sub-cavity. A suspended micro-slag catcher 24 is provided in the front sub-cavity. The suspended micro-slag catcher 24 includes at least one magnetic roller 241 mounted on the top of the front sub-cavity and one free roller 242 mounted on the top of the front sub-cavity. The lower part of the magnetic roller 241 is submerged in the cutting oil and can rotate autonomously. The gap between the free roller 242 and the magnetic roller 241 is adjustable. A slag discharge trough 245 is fixed in front of the front sub-cavity. An elastic scraper 246 is provided behind the slag discharge trough 245. The scraper 246 is in contact with the surface of the magnetic roller 241. By dividing the metal impurity separation chamber into three sub-chambers and guiding the cutting oil to flow slowly through the overflow port at the top of the partition, it provides graded settling conditions for impurities of different particle sizes. The rear coarse slag collection basket can efficiently intercept large metal chips, the middle fine slag collection basket captures medium-sized impurities, and the front suspended micro slag catcher uses a magnetic roller to adsorb fine magnetic micro slag. In addition, the elastic scraper automatically scrapes off impurities from the roller surface and guides them into the slag discharge trough, forming a three-stage progressive impurity removal process of "coarse-fine-micro". This not only avoids the problem of impurity leakage or blockage caused by single-chamber treatment, but also prevents impurities from being mixed into the oil again through the self-cleaning structure, significantly improving the thoroughness and stability of metal impurity removal.

[0036] In another preferred embodiment, the magnetic roller 241 is rotatably connected to the front sub-cavity sidewall via bearing seats 244 at both ends, and one end extends through the front sub-cavity sidewall and is connected to the drive motor 243 for transmission. The drive motor provides stable power to the magnetic roller, ensuring that the magnetic roller can rotate autonomously and at a uniform speed. Compared with passive rotation (relying on the flow of oil), this allows the roller surface to uniformly contact the suspended micro-slag in the oil, avoiding local adsorption saturation or insufficient contact. At the same time, in conjunction with the elastic scraper, it realizes continuous "adsorption-scraping" operation, ensuring the continuity of suspended micro-slag treatment, reducing the problem of micro-slag accumulation caused by the magnetic roller stopping, and improving the continuous operation capability of the metal impurity separation chamber.

[0037] In another preferred embodiment, a guide groove 247 is fixedly provided on the front sub-cavity sidewall. The longitudinal direction of the guide groove 247 is along the radial direction of the magnetic roller 241. A fixing seat 249 is fixedly provided on the front sub-cavity sidewall at the upper end of the guide groove 247. The guide groove 247 is slidably fitted with a guide rod 248. The guide rod 248 is rotatably connected to the rotating shaft of the free roller 242 and fixedly connected to the lower end of the screw 2410. The upper end of the screw 2410 passes through the fixing seat 249 and is tightened by two nuts 2411. By utilizing the cooperative structure of guide grooves, guide rods, and screws, the free rollers can be moved radially along the magnetic roller by adjusting the screws, thereby flexibly adjusting the gap between the free rollers and the magnetic roller. For cutting oils with different levels of contamination (such as differences in micro-slag particle size), the appropriate gap can be precisely set, which avoids the gap being too large, causing fine micro-slag to leak through, and also prevents the gap being too small, which hinders the flow of oil or excessively squeezes impurities, causing wear on the roller surface. This significantly enhances the adaptability of the suspended micro-slag catcher to different working conditions and ensures effective interception of various fine magnetic micro-slags.

[0038] In another preferred embodiment, the left and right side walls of the oxidation product adsorption chamber 3 are provided with one or more sets of slots 31, and a composite adsorption component is inserted into each set of slots 31. The composite adsorption component includes a detachable frame 32 and a porous filter layer 33 and an adsorption layer 34 fixed in the frame. The porous filter layer 33 is located upstream, i.e., close to the front connecting pipe 6, and the adsorption layer 34 is located downstream, i.e., close to the rear connecting pipe 8. The side wall of the oxidation product adsorption chamber 3 is provided with a transparent observation window 35, which is arranged along the height direction of the chamber. The composite adsorption assembly, which connects via slots, employs a dual-layer structure of "upstream porous filter layer + downstream adsorption layer." The porous filter layer first intercepts residual colloidal particles and fine impurities in the oil, preventing them from clogging the pores of the adsorption layer and reducing the adsorption efficiency of oxidation products. The downstream adsorption layer specifically captures aldehydes and ketones, oxidation products that cause the oil to turn black, achieving a synergistic effect of "pretreatment-deep purification." Meanwhile, transparent observation windows arranged along the height of the bulkhead allow for direct observation of color changes in the adsorption layer (such as a darkening of the color after adsorption saturation), facilitating timely monitoring of the adsorption status by operators and providing accurate information for subsequent component replacement, thus preventing adsorption failure from affecting the purification effect.

[0039] In another preferred embodiment, the detachable frame 32 is provided with sliders on both sides, and the inner wall of the oxidation product adsorption chamber 3 is provided with corresponding slide rails. The frame is detachably connected by sliding cooperation between the sliders and the slide rails. The height of the transparent observation window 35 is not less than 2 / 3 of the height of the oxidation product adsorption chamber 3. The detachable frame, through the sliding cooperation between the sliders and the slide rails, allows for quick pulling and replacement of the composite adsorption component, significantly shortening the operation time for component replacement (compared to traditional bolt-fixed structures) and reducing maintenance difficulty. The transparent observation window, which is not less than 2 / 3 of the height of the oxidation product adsorption chamber, can completely cover the oil level range and the adsorption component area inside the chamber, ensuring that operators can clearly observe the oil flow status and the saturation of the adsorption layer, avoiding monitoring blind spots caused by insufficient observation window height, and further improving the convenience and accuracy of maintenance operations.

[0040] In another preferred embodiment, the microbial inhibition chamber 4 is equipped with multiple ultraviolet sterilization modules 41. Each ultraviolet sterilization module 41 includes a lamp tube and a waterproof sleeve covering the outside of the lamp tube, with the waterproof sleeve submerged in the cutting oil. The waterproof sleeve design of the ultraviolet sterilization module allows the lamp tube to be completely submerged in the cutting oil, achieving "full immersion" sterilization. Compared to methods that only irradiate the surface of the oil, this allows ultraviolet light to directly penetrate the interior of the oil, killing microorganisms (such as bacteria and fungi) hidden in the oil. This avoids sterilization dead zones caused by ultraviolet light not being able to reach the deep layers of the oil, effectively inhibiting the dark secretions produced by microbial metabolism, and preventing the purified cutting oil from turning black again due to microbial activity, thus ensuring the long-term stable appearance and performance of the oil.

[0041] In another preferred embodiment, the bottom of the microbial inhibition chamber 4 is provided with a few turbulence baffles 42, which are arranged in a labyrinthine pattern along the flow direction of the cutting oil and are fixed vertically to the bottom of the chamber; the ultraviolet sterilization modules 41 are evenly distributed, and the distance between adjacent modules is 150-250mm; the height of the turbulence baffles 42 is 1 / 3-1 / 2 of the cutting oil level in the microbial inhibition chamber 4, and the distance between adjacent turbulence baffles 42 is 100-150mm. The labyrinthine arrangement of baffles along the direction of cutting oil flow forces the oil to flow around the flow, significantly extending the residence time of the oil in the microbial inhibition chamber and providing sufficient action time for the ultraviolet sterilization module. The uniform spacing (150-250mm) of the ultraviolet sterilization module ensures sterilization coverage without dead corners, while the adaptive design of the baffle height (1 / 3-1 / 2 of the liquid level) and spacing (100-150mm) avoids both excessively high baffles obstructing oil flow and excessively large spacing leading to insufficient turbulence effect. Ultimately, this achieves full contact between the oil and ultraviolet light, significantly improving the microbial kill rate while avoiding energy waste.

[0042] In another preferred embodiment, the control box 9 is equipped with a power switch 91 and corresponding operation indicator lights 92 for each compartment on its surface, and has a timer controller electrically connected to the ultraviolet sterilization module 41 inside. The power switch and operation indicator lights on the surface of the control box can provide real-time feedback on the working status of the metal impurity separation chamber, oxidation product adsorption chamber, and microbial inhibition chamber (such as whether they are operating normally or whether there is an overload), which facilitates operators to quickly troubleshoot faults. The timer controller, which is electrically connected to the ultraviolet sterilization module inside, can preset the sterilization duration and start / stop time, eliminating the need for manual operation and adjustment. This reduces labor costs and avoids problems such as untimely sterilization or excessive energy consumption caused by human error, thus improving the convenience and stability of the device operation.

[0043] In another preferred embodiment, the diameters of the front connecting pipe 6 and the rear connecting pipe 8 are 50-80mm, and the front flow limiting valve 5 and the rear flow limiting valve 7 are manually adjustable ball valves; both the inlet 11 and the clean liquid outlet 12 are equipped with flange interfaces. The 50-80mm diameter front / rear connecting pipes can adapt to the cutting oil processing flow rate of small and medium-sized machining centers, avoiding flow bottlenecks caused by too small a pipe diameter or excessively large a pipe diameter causing excessively fast oil flow rate and insufficient treatment; the manually adjustable front / rear flow limiting valves can flexibly control the oil intake of each chamber according to the degree of cutting oil contamination (such as impurity content and oxidation product concentration), ensuring a balanced load in each stage of metal impurity separation, oxidation product adsorption, and microbial inhibition; the flange interfaces of the inlet and the clean liquid outlet facilitate quick docking of the device with existing cutting oil circulation systems without additional pipeline modifications, significantly improving the installation compatibility and system adaptability of the device.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-stage purification device for blackening cutting oil, characterized in that: The device includes a main body (1), which contains a metal impurity separation chamber (2), an oxidation product adsorption chamber (3), and a microbial inhibition chamber (4) arranged sequentially along the direction of cutting oil flow. An inlet (11) is located near the top of the left rear side of the main body (1), and the inlet (11) is connected to the metal impurity separation chamber (2). A clean liquid outlet (12) is located near the bottom of the right front side of the main body (1), and the clean liquid outlet (12) is connected to the microbial inhibition chamber (4). The metal impurity separation chamber (2) and the oxidation product adsorption chamber (3) are connected in series through a front flow limiting valve (5) and a front connecting pipe (6). The oxidation product adsorption chamber (3) and the microbial inhibition chamber (4) are connected in series through a rear flow limiting valve (7) and a rear connecting pipe (8). A control box (9) is located on the outside of the main body (1).

2. The multi-stage purification device for blackening cutting oil according to claim 1, characterized in that: The metal impurity separation chamber (2) is divided into three sub-chambers from back to front. The liquid inlet (11) is located in the rear sub-chamber. Overflow outlets (21) are located at the top of the partition between the rear and middle sub-chambers and at the top of the partition between the middle and front sub-chambers, respectively. A coarse slag collection basket (22) is hung in the rear sub-chamber, a fine slag collection basket (23) is hung in the middle sub-chamber, and a suspended micro-slag catcher (24) is provided in the front sub-chamber. The suspended micro-slag catcher (24) includes at least one A magnetic roller (241) is mounted on the top of the front sub-cavity, and a free roller (242) is mounted on the top of the front sub-cavity. The lower part of the magnetic roller (241) is submerged in cutting oil and can rotate independently. The gap between the free roller (242) and the magnetic roller (241) is adjustable. A slag discharge trough (245) is fixed at the front of the front sub-cavity. An elastic scraper (246) is provided behind the slag discharge trough (245). The scraper (246) is in contact with the surface of the magnetic roller (241).

3. The multi-stage purification device for blackening cutting oil according to claim 2, characterized in that: The magnetic roller (241) is rotatably connected to the front sub-cavity sidewall at both ends through bearing seats (244), and one end passes through the front sub-cavity sidewall and is connected to the drive motor (243) for transmission.

4. The multi-stage purification device for blackening cutting oil according to claim 2, characterized in that: A guide groove (247) is fixed on the side wall of the front sub-cavity. The longitudinal direction of the guide groove (247) is along the radial direction of the magnetic roller (241). A fixed seat (249) is fixed on the side wall of the front sub-cavity at the upper end of the guide groove (247). The guide groove (247) is slidably fitted with a guide rod (248). The guide rod (248) is connected to the rotating shaft of the free roller (242) and fixed to the lower end of the screw (2410). The upper end of the screw (2410) passes through the fixed seat (249) and is tightened by two nuts (2411).

5. The multi-stage purification device for blackening cutting oil according to claim 1, characterized in that: The oxidation product adsorption chamber (3) has one or more slots (31) on its left and right side walls. Each slot (31) is fitted with a composite adsorption component. The composite adsorption component includes a detachable frame (32) and a porous filter layer (33) and an adsorption layer (34) fixed in the frame. The porous filter layer (33) is located upstream, near the front connecting pipe (6), and the adsorption layer (34) is located downstream, near the rear connecting pipe (8). The side wall of the oxidation product adsorption chamber (3) is provided with a transparent observation window (35), which is arranged along the height of the chamber.

6. The multi-stage purification device for blackening cutting oil according to claim 5, characterized in that: The detachable frame (32) is provided with sliders on both sides, and the inner wall of the oxidation product adsorption chamber (3) is provided with corresponding slide rails. The frame is detachably connected by sliding cooperation between the sliders and the slide rails. The height of the transparent observation window (35) is not less than 2 / 3 of the height of the oxidation product adsorption chamber (3).

7. The multi-stage purification device for blackening cutting oil according to claim 1, characterized in that: The microbial inhibition chamber (4) is equipped with multiple ultraviolet sterilization modules (41). The ultraviolet sterilization module (41) includes a lamp tube and a waterproof sleeve covering the outside of the lamp tube. The waterproof sleeve is submerged in the cutting oil.

8. The multi-stage purification device for blackening cutting oil according to claim 7, characterized in that: The bottom of the microbial inhibition chamber (4) is provided with a few turbulence plates (42). The turbulence plates (42) are arranged in a labyrinthine pattern along the flow direction of the cutting oil and are fixed vertically to the bottom of the chamber. The ultraviolet sterilization modules (41) are evenly distributed, and the distance between adjacent modules is 150-250mm. The height of the turbulence plates (42) is 1 / 3-1 / 2 of the cutting oil level in the microbial inhibition chamber (4), and the distance between adjacent turbulence plates (42) is 100-150mm.

9. The multi-stage purification device for blackening cutting oil according to claim 1, characterized in that: The control box (9) is equipped with a power switch (91) and corresponding operation indicator lights (92) for each compartment on its surface, and has a timer controller that is electrically connected to the ultraviolet sterilization module (41) inside.

10. The multi-stage purification device for blackening cutting oil according to claim 1, characterized in that: The diameter of the front connecting pipe (6) and the rear connecting pipe (8) is 50-80mm, and the front flow limiting valve (5) and the rear flow limiting valve (7) are manually adjustable ball valves; the liquid inlet (11) and the clean liquid outlet (12) are both provided with flange interfaces.

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