A cutting fluid filtering device and a numerical control machine tool containing the same

Abstract

The present application relates to a kind of cutting fluid filtering device and numerical control machine tool containing the device, the cutting fluid filtering device includes: collection pool, the lower end of collection pool is fixed with adapter, the lower end of adapter is fixed with electromagnetic filtering mechanism, the right side upper portion of electromagnetic filtering mechanism is connected with conveying flow channel, the right side port of conveying flow channel is connected with circulating pump, the upper end of circulating pump is connected with liquid outlet flow channel, the present application adopts electromagnetic and physical filtration combined mode, can effectively remove large particle iron filings and small oil oxidation product in cutting fluid, and through innovative electromagnetic filtration and fluid dynamics design, realizes the efficient, fast and continuous separation of oil oxidation product and iron filings in cutting fluid, significantly improve the cleanliness, stability and service life of cutting fluid, while reducing maintenance cost and operation complexity, to provide more efficient, stable and economic solution for cutting processing.

Description

Technical Field

[0001] This invention relates to the field of CNC machine tools, and more particularly to a cutting fluid filtration device and a CNC machine tool containing the device. Background Technology

[0002] As a crucial piece of equipment in modern manufacturing, CNC machine tools have seen increasing application, leading to greater emphasis on cutting fluid filtration technology. Cutting fluid plays a vital role in cooling, lubrication, and cleaning during the cutting process. However, over time, a large amount of cutting chips, grease, and other impurities accumulate in the cutting fluid. These oil oxidation products are generated due to the cutting fluid's contact with oxygen in the air during prolonged use and at high temperatures. These oil oxidation products degrade the cutting fluid's performance, affecting machining quality and tool life. Therefore, regular cutting fluid replacement or the use of additives such as antioxidants and rust inhibitors are necessary to extend the cutting fluid's lifespan and maintain its performance. Traditional cutting fluid filtration methods often employ mechanical filtration, such as filter paper and filter screens. While these methods effectively remove large particles, the filter screens are prone to clogging, requiring frequent replacement and cleaning, increasing maintenance costs and workload.

[0003] To address these issues, existing technologies have proposed some improvements, but certain limitations remain. For example, patent CN113546756A discloses a rapid purification and filtration system and method for cutting fluid, which uses a magnetic rod to collect iron filings in the cutting fluid. However, it still has the following shortcomings: 1. Difficulty in collecting and adsorbing oil oxidation products: Oil oxidation products usually exist in the cutting fluid as fine particles or in a suspended state. Due to their small particle size and light weight, oil oxidation products are difficult to collect and adsorb effectively in the fluid. 2. During the cutting process, steel or other metal materials generate tiny iron or metal filings, which are suspended in the cutting fluid. During the filtration process, because these tiny iron filings are small in size and light in density, they often slip through the fluid flow and are not completely captured and removed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention aims to provide a cutting fluid filtration device and a CNC machine tool incorporating the device. It solves the problems existing in the prior art by generating a strong electric field through an electromagnet and embedded electrode plates in the electromagnetic filtration mechanism, forming a specific electric field fluidization region. Because oil oxidation products carry specific charges, they are influenced by the electric field force and move towards the region of high electric field strength. This makes it easier for oil oxidation products to form an affinity with the electromagnet surface and be effectively adsorbed and removed. Furthermore, the multiple annular electrode plates embedded in the inner wall of the chip collection chamber, arranged in a ring, further improve the range and efficiency of the electric field. These electrode plates increase the coverage of the electric field fluidization region, allowing oil oxidation products to be adsorbed and removed over a wider area, thus improving filtration efficiency.

[0005] Adsorption of Tiny Iron Scrap: The unique design of the buffer chamber effectively slows the flow rate of the cutting fluid. Utilizing the shape of the buffer chamber and the layout of the arc-shaped baffles, rapid and effective separation of tiny iron scraps from the fluid is achieved. This hydrodynamic design not only reduces the flow velocity of tiny iron scraps but also guides them above the elastic valves. In conjunction with the characteristics of the elastic valves, the gap between the two valves automatically opens when the iron scraps approach, forming an open channel that allows the scraps to fall rapidly under gravity and be adsorbed. This comprehensive design ensures that tiny iron scraps are effectively and quickly captured and concentrated in a specific collection chamber, thus preventing them from re-entering the cutting fluid flow and maintaining the cleanliness and stability of the cutting fluid.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a cutting fluid filtration device and a CNC machine tool containing the device. The cutting fluid filtration device includes: a collection tank, an adapter fixed to the lower end of the collection tank, an electromagnetic filtering mechanism fixed to the lower end of the adapter, a conveying channel connected to the upper right side of the electromagnetic filtering mechanism, a circulating pump connected to the right port of the conveying channel, and an outlet channel connected to the upper end of the circulating pump.

[0007] The electromagnetic filter mechanism includes a filter tube, a chip collection chamber sealed at the bottom of the filter tube, an electromagnet fixed at the bottom of the chip collection chamber, a T-shaped pipe inserted at the top of the filter tube, a return pipe sleeved at the axial position of the T-shaped pipe, and a filter screen fixed between the chip collection chamber and the return pipe.

[0008] Preferably, multiple electrode plates are embedded in the inner wall of the chip collection cavity.

[0009] Preferably, the lower end of the return pipe extends into the interior of the chip collection chamber.

[0010] Preferably, the multiple electrode plates are arranged in a ring.

[0011] Preferably, the conveying channel includes a conveying pipe sleeved on the right side of the three-way pipe, a buffer chamber is provided in the middle of the conveying pipe, multiple iron powder collection chambers are fixed at the lower end of the conveying pipe, a rubidium magnet is fixed at the bottom of the iron powder collection chamber, a valve clamp is provided at the bottom of the conveying pipe, and two elastic valves are fixed on the inner side of the valve clamp.

[0012] Preferably, a hemispherical buffer chamber is provided on the left side of the buffer chamber, and an array of arc-shaped baffles is provided on the buffer chamber. A liquid outlet pipe is provided through the middle of the buffer chamber.

[0013] Preferably, the elastic valves are symmetrically arranged, with the middle of the two elastic valves attached together, and their arc-shaped ends fixed to the two end faces of the valve clip.

[0014] Preferably, a membrane filter is fixed in the middle of the liquid outlet channel.

[0015] Preferably, the filter screen has a pore size of 0.3-0.5 mm.

[0016] The present invention aims to provide a cutting fluid filtration device and a CNC machine tool incorporating the device. This invention employs a combination of electromagnetic and physical filtration to effectively remove large iron filings and minute oil oxidation products from the cutting fluid. It utilizes a specially designed electromagnet and embedded electrode plate to generate a strong electric field in the filtered liquid. This electric field significantly enhances the adsorption capacity of oil oxidation products and iron filings in the cutting fluid. The physical filter screen and valve clamps further ensure the filtration effect and maintain the cleanliness of the cutting fluid. Through innovative electromagnetic filtration and fluid dynamics design, it achieves efficient, rapid, and continuous separation of oil oxidation products and iron filings from the cutting fluid, significantly improving the cleanliness, stability, and service life of the cutting fluid, while reducing maintenance costs and operational complexity. This provides a more efficient, stable, and economical solution for machining operations. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall invention.

[0018] Figure 2 This is a cross-sectional view of the electromagnetic filtering mechanism in this invention.

[0019] Figure 3 This is a cross-sectional view of the conveying channel in this invention.

[0020] Figure 4 This is a cross-sectional view at point A in this invention.

[0021] Figure 5 This is a cross-sectional view of the buffer compartment in this invention.

[0022] Figure 6 This is a flow diagram of the liquid in this invention.

[0023] In the diagram: 1-Collection tank 2-Adapter 3-Electromagnetic filter mechanism 4-Transport channel 5-Circulation pump 6-Discharge channel 7-Membrane filter 31-Filter tube 32-Collection chamber 33-Electromagnet 34-T-connector 35-Return pipe 36-Filter screen 41-Transport pipe 42-Buffer chamber 43-Iron powder collection chamber 44-Neodymium magnet 45-Valve clamp 46-Elastic valve 321-Electrode plate 421-Buffer chamber 422-Breakthrough strip 423-Discharge pipe. Detailed Implementation

[0024] The following will refer to the appendix in the examples of this invention. Figures 1-6 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The present invention provides a technical solution: a cutting fluid filtration device, comprising a collection tank 1, an adapter 2 fixed at the lower end of the collection tank 1, characterized in that an electromagnetic filtering mechanism 3 is fixed at the lower end of the adapter 2, a conveying channel 4 is connected to the upper right side of the electromagnetic filtering mechanism 3, a circulation pump 5 is connected to the right port of the conveying channel 4, an outlet channel 6 is connected to the upper end of the circulation pump 5, and a membrane filter 7 is fixed in the middle of the outlet channel 6.

[0026] Collection tank 1 is used to collect and gather the cutting fluid to be filtered, serving as the starting point of the entire filtration system. Adapter 2 is used to connect collection tank 1 to electromagnetic filter mechanism 3, providing a fluid transmission path. Electromagnetic filter mechanism 3 is used to generate an electric field: an electric field is generated by an electromagnet and an embedded electrode plate to adsorb and separate oil oxidation products and iron filings in the cutting fluid.

[0027] The delivery channel 4 guides the flow of cutting fluid, directing the cutting fluid treated by the electromagnetic filter towards the circulation pump. The circulation pump 5 circulates the cutting fluid, drawing it from the electromagnetic filter and returning it to the working area, maintaining its recycling and providing flow pressure: the pump provides the necessary flow pressure to ensure flow stability and speed. The outlet channel 6 serves as the main channel for the cutting fluid to return from the circulation pump to the working area. The membrane filter 7 further purifies the cutting fluid before it returns to the working area, removing any remaining microparticles and oil oxidation products to ensure the final quality of the cutting fluid. Through the synergistic action of these components, this cutting fluid filtration device effectively removes oil oxidation products and metal filings from the cutting fluid, improving its cleanliness and stability, thereby extending its service life and improving machining quality.

[0028] The electromagnetic filter mechanism 3 includes a filter tube 31, a chip collection chamber 32 sealed to the bottom of the filter tube 31, an electromagnet 33 fixed to the bottom of the chip collection chamber 32, a three-way pipe 34 inserted into the top of the filter tube 31, a return pipe 35 sleeved at the axial position of the three-way pipe 34, and a filter screen 36 fixed between the chip collection chamber 32 and the return pipe 35; the upper end of the return pipe 35 extends through to the adapter 2, and the lower end of the return pipe 35 extends through to the interior of the chip collection chamber 32.

[0029] The filter tube 31 provides a filtration channel. Through the inner wall of the filter tube, the cutting fluid flows through the electromagnetic filtration area, causing the oil oxidation products and iron filings in the cutting fluid to be adsorbed. The chip collecting chamber 32 collects iron filings. Due to the adsorption effect of the electromagnet, the iron filings in the cutting fluid are concentrated and fixed at the bottom of the chip collecting chamber. It also helps to further separate some of the oil oxidation products adsorbed on the iron filings and reduce interference with subsequent processing. Multiple electrode plates 321 are embedded in the inner wall of the chip collecting chamber 32. The multiple electrode plates 321 are arranged in a ring. The electromagnet 33 generates a magnetic field at the bottom of the chip collecting chamber. The functions of these components are:

[0030] 1. Electric Field Generation: When the electromagnet and electrode plates in the electromagnetic filter mechanism work together, these electrode plates generate and enhance the electric field effect under the action of the electromagnet. The magnetic field generated by the electromagnet interacts with the electric field of the electrode plates to form a strong electric field fluidization region, which helps to effectively adsorb and separate oil oxidation products and iron filings in the cutting fluid.

[0031] 2. Directional movement of oil oxidation products: Because oil oxidation products carry a specific charge, the electric field within the electromagnetic filtration mechanism affects their direction of movement. Under the influence of this strong electric field, the oil oxidation products are attracted to areas with high electric field strength, making it easier for them to develop an affinity for the electromagnet surface and be effectively adsorbed and removed.

[0032] 3. Improved Adsorption Efficiency: The annular arrangement of the electrode plates enhances the uniformity and stability of the electric field. This helps to improve the adsorption efficiency of oil oxidation products and iron filings in the electromagnetic filtration mechanism, making it more thorough and efficient.

[0033] 4. Improved filtration accuracy: The electrode plates not only generate an electric field, but also serve as a key component of the filtration device. Through the gaps between the electrode plates, the cutting fluid can flow freely while blocking most oil oxidation products and iron filings, thus achieving efficient and precise filtration.

[0034] By using multiple electrode plates 321 embedded in the chip collection chamber, the electromagnetic filtration mechanism not only achieves effective adsorption and separation of oil oxidation products and iron filings, but also greatly improves filtration accuracy and efficiency, ensuring efficient purification and reuse of cutting fluid.

[0035] The tee pipe 34 guides the fluid, serving as the outlet of the filter pipe, directing the treated cutting fluid to the subsequent return pipe and delivery pipeline. Sealing function: By sealing with the return pipe 35, it ensures that the cutting fluid can only enter the delivery pipeline through the right-side outlet of the tee pipe 34. Functions of the return pipe 35: Circulation: Returns the filtered and adsorbed cutting fluid to the system, maintaining its recycling. Cutting fluid distribution: Distributes the cutting fluid evenly to the filter pipe and tee pipe, ensuring that each portion of the cutting fluid is effectively filtered. The filter screen 36 has a pore size of 0.3-0.5 mm. Its function is secondary filtration: Before the cutting fluid flows through the return pipe, it further captures and separates any remaining oil oxidation products and small particles. System protection: Prevents excessively large particles or substances from entering the subsequent circulation system, protecting the normal operation of the circulation pump and other equipment.

[0036] Through the synergistic effect of the above components, the electromagnetic filtration mechanism effectively removes oil oxidation products and iron filings from the cutting fluid, thereby improving the cleanliness of the cutting fluid, extending its service life, and reducing the frequency and cost of equipment maintenance.

[0037] The conveying channel 4 includes a conveying pipe 41 sleeved on the right side of the three-way pipe 34. A buffer chamber 42 is provided in the middle of the conveying pipe 41. Multiple iron powder collection chambers 43 are fixed at the lower end of the conveying pipe 41. A neodymium magnet 44 is fixed at the bottom of the iron powder collection chamber 43. A valve clamp 45 is provided at the bottom of the conveying pipe 41. Two elastic valves 46 are fixed on the inner side of the valve clamp 45.

[0038] The delivery pipe 41 guides the filtered cutting fluid smoothly from the electromagnetic filter mechanism to the next processing stage. Its design ensures the stability and uniformity of the cutting fluid flow. The presence of the buffer chamber 42 helps slow the flow rate of the cutting fluid, avoiding liquid shock and fluctuations caused by excessively rapid flow. This helps stabilize the flow of the cutting fluid while providing more time for effective separation of iron filings and oil oxidation products. The design within the buffer chamber 42, including the hemispherical buffer cavity 421, the arc-shaped baffles 422, and the outlet pipe 423, is primarily designed to optimize the flow and stability of the cutting fluid for more effective iron filings separation and cutting fluid treatment. The following is a detailed description of the function of each part: The hemispherical buffer cavity 421 helps slow the flow rate of the cutting fluid, thereby preventing liquid shock and fluctuations caused by excessively rapid flow. This gentle flow facilitates the deposition of solid particles (such as iron filings) within the cutting fluid. The arc-shaped baffles 422 are designed in an array form, generating minute liquid flow disturbances within the buffer cavity 421. These baffles help to evenly distribute solid particles within the cutting fluid. The outlet pipe 423 runs through the middle of the buffer tank 42, and its main function is to guide the treated cutting fluid smoothly out of the buffer tank 42 to subsequent processing stages or circulation. It ensures that the cutting fluid flows out of the buffer tank stably and evenly, while avoiding any potential flow instability or backflow problems.

[0039] The iron powder collection chamber 43 is designed to collect and store adsorbed iron filings. A neodymium magnet 44 fixed to its bottom provides additional magnetic attraction, ensuring more efficient iron filings collection. This adsorption mechanism utilizes the magnetism of the iron filings, making them easier to capture and concentrate.

[0040] The elastic valves 46 are symmetrically arranged, with two elastic valves 46 joined together at their midpoints, and their arc-shaped ends fixed to the two end faces of the valve clamp 45. The valve clamp 45 and the two elastic valves 46 fixed inside it work together to allow the elastic valves to open when a large amount of iron filings enters, allowing the iron filings to pass through smoothly while blocking the excessively rapid flow of cutting fluid. After the iron filings are absorbed and stored in the iron powder collection chamber 43, the elastic valves will close again to prevent the iron filings from re-entering the cutting fluid flow.

[0041] Through this series of designs, the delivery channel 4 can not only effectively separate and collect iron filings in the cutting fluid, but also ensure the stable flow of the cutting fluid, thereby achieving efficient and precise cutting fluid treatment and reuse.

[0042] The working principle of this invention can be divided into the following stages:

[0043] 1. Cutting fluid collection stage: The cutting fluid to be filtered first flows into the collection tank. Here, the cutting fluid is prepared and introduced into the filtration device.

[0044] 2. Electric Field Generation in the Electromagnetic Filter Mechanism: When the cutting fluid enters the electromagnetic filter mechanism, the electromagnets and embedded electrode plates within the mechanism begin to operate, generating a strong electric field. This electric field creates a specific electric field fluidization region within the electromagnetic filter mechanism.

[0045] 3. Adsorption and separation of oil oxidation products and iron filings: First, the cutting fluid flows through the return pipe 35 to the bottom of the chip collection chamber 32:

[0046] Adsorption of oil oxidation products: Because oil oxidation products carry a specific charge, they are affected by the electric field and move towards regions with high electric field strength. During this process, oil oxidation products readily develop an affinity for the electromagnet surface and are adsorbed and removed.

[0047] Adsorption of iron filings: The strong magnetic properties of an electromagnet can quickly attract iron filings from the cutting fluid. At the same time, due to the physical or chemical affinity between oil oxidation products and iron filings, such as van der Waals forces, they will also be attracted to the surface of the electromagnet.

[0048] 4. Cutting fluid return: The fluid flows upward through the filter screen 36 between the return pipe 35 and the chip collection chamber 32, through the cavity between the return pipe 35 and the filter pipe 31, to the right outlet of the three-way pipe 34 and to the delivery channel 4.

[0049] 5. Filtration of Fine Iron Scrap: At higher flow rates, some fine iron scraps may enter the delivery channel 4 along with the cutting fluid flow. This cutting fluid first impacts the buffer chamber 42, slowing the flow rate and guiding the fine iron scraps above the elastic valve 46. Here, the neodymium magnet 44 generates an attractive force, causing the fine iron scraps to be adsorbed into the iron powder collection chamber 43. After adsorption is complete, the elastic valve 46 returns to its original shape.

[0050] 6. Circulation and Discharge: The cutting fluid, after being filtered through multiple layers, is drawn in by the circulation pump 5, pressurized and transported to the discharge channel 6, and then introduced into the cutting fluid nozzle of the machine tool for recycling.

[0051] In this way, the cutting fluid filtration device of the present invention can effectively remove oil oxidation products and iron filings from the cutting fluid, ensuring the cleanliness and stability of the cutting fluid, extending the service life of the cutting fluid, and improving the processing quality and the service life of the equipment.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cutting fluid filtration device, comprising: A collection tank (1) is provided with an adapter (2) fixed at its lower end. The adapter (2) is characterized in that an electromagnetic filter mechanism (3) is fixed at its lower end. A conveying channel (4) is connected to the upper right side of the electromagnetic filter mechanism (3). A circulation pump (5) is connected to the right side port of the conveying channel (4). An outlet channel (6) is connected to the upper end of the circulation pump (5). The electromagnetic filtering mechanism (3) includes a filter tube (31), a chip collection chamber (32) is sealed at the bottom of the filter tube (31), an electromagnet (33) is fixed at the bottom of the chip collection chamber (32), a three-way pipe (34) is inserted into the top of the filter tube (31), a return pipe (35) is sleeved at the axial position of the three-way pipe (34), and a filter screen (36) is fixed between the chip collection chamber (32) and the return pipe (35). Multiple electrode plates (321) are embedded in the inner wall of the chip collection cavity (32). The upper end of the return pipe (35) extends through the adapter (2), and the lower end of the return pipe (35) extends through the interior of the chip collection chamber (32).

2. The cutting fluid filtration device according to claim 1, characterized in that, The multiple electrode plates (321) are arranged in a ring shape.

3. The cutting fluid filtration device according to claim 1, characterized in that, The conveying channel (4) includes a conveying pipe (41) sleeved on the right side of the three-way pipe (34). A buffer chamber (42) is provided in the middle of the conveying pipe (41). Multiple iron powder collection chambers (43) are fixed at the lower end of the conveying pipe (41). A rubidium magnet (44) is fixed at the bottom of the iron powder collection chamber (43). A valve clamp (45) is provided at the bottom of the conveying pipe (41). Two elastic valves (46) are fixed on the inner side of the valve clamp (45).

4. A cutting fluid filtration device according to claim 3, characterized in that, The buffer chamber (42) has a hemispherical buffer cavity (421) on its left side, and an arc-shaped baffle strip (422) is arranged on the buffer cavity (421). The buffer chamber (423) has a liquid outlet pipe (423) running through its middle.

5. A cutting fluid filtration device according to claim 3, characterized in that, The elastic valves (46) are symmetrically arranged, and the two elastic valves (46) are connected in the middle, with their arc-shaped ends fixed to the two end faces of the valve clamp (45).

6. A cutting fluid filtration device according to claim 1, characterized in that, A membrane filter (7) is fixed in the middle of the liquid outlet channel (6).

7. A cutting fluid filtration device according to claim 1, characterized in that, The filter screen (36) has a pore size of 0.3-0.5 mm.

8. A CNC machine tool, characterized in that, Includes the cutting fluid filtration device as described in any one of claims 1-7.

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