Cutting fluid filtering and recycling system for numerical control machine tool

Abstract

The application discloses a cutting fluid filtering and recycling system for a numerical control machine tool and relates to the technical field of numerical control machine tools, which comprises a box body of a liquid suction filtering box, a control box is installed on the outer wall of the box body, a crankshaft is rotationally arranged in the box body, one end of the crankshaft is connected with a motor output shaft, a slag discharge port is formed in the side wall of the box body, a sealing plate is arranged at the slag discharge port, two groups of piston assemblies are rotationally connected to the outer wall of the crankshaft, a first connecting pipe is arranged between the upper ends of the two groups of piston assemblies, a liquid discharge assembly is arranged in the middle of the first connecting pipe, and a fine filtering assembly is arranged between the two groups of piston assemblies. The application sucks liquid through the piston assembly, and preliminary filtering is performed before liquid suction, so that metal particles are prevented from entering, thereby protecting the inner cavity of the piston cylinder. Meanwhile, the sealing cover is threadedly connected with the extrusion ring, is opened in a screwing manner, and replacement of the wear-resistant cylinder and the piston by workers is facilitated.

Description

Technical Field

[0001] This invention relates to the technical field of CNC machine tools, and more particularly to a cutting fluid filtration and recovery system for CNC machine tools. Background Technology

[0002] Cutting fluid is an industrial liquid used in metal cutting and grinding processes to cool and lubricate tools and workpieces. It is made of a variety of high-performance additives through scientific compounding and has good cooling performance, lubrication performance, rust prevention performance, degreasing and cleaning function, anti-corrosion function, and easy dilution characteristics.

[0003] During cutting, drilling, and other machining processes, cutting fluid is sprayed to cool the fluid and remove metal filings. The cutting fluid and metal filings are discharged together; this metal-filament-containing cutting fluid is called dirty fluid. When recycling cutting fluid, we need to remove the metal filings and other impurities. However, these impurities can damage the pump impeller and sealing components, significantly shortening the pump's lifespan over time. Summary of the Invention

[0004] The purpose of this invention is to provide a cutting fluid filtration and recovery system for CNC machine tools in order to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a cutting fluid filtration and recovery system for CNC machine tools, comprising a liquid suction filter box housing, a control box installed on the outer wall of the housing, a crankshaft rotatably mounted inside the housing, one end of the crankshaft being connected to a motor output shaft, a slag discharge port opened on the side wall of the housing, a sealing plate installed at the slag discharge port, two sets of piston assemblies rotatably connected to the outer wall of the crankshaft, a first connecting pipe installed between the upper ends of the two sets of piston assemblies, a liquid discharge assembly installed in the middle of the first connecting pipe, a fine filtration assembly installed between the two sets of piston assemblies, primary filtration assemblies installed on both sides of the housing for use with the piston assemblies, a connector installed between the piston assembly and the primary filtration assembly, a T-shaped hole installed inside the connector, the connector communicating with the piston assembly and the primary filtration assembly respectively, a second filter screen installed at the lower end of the housing, a second liquid suction pipe installed inside the housing, the second liquid suction pipe communicating with the connector, and a solenoid valve installed inside the second liquid suction pipe;

[0006] The primary filtration assembly includes an outer cylinder. Inside the outer cylinder, a first filter screen and a baffle plate are fixedly arranged from top to bottom. A first liquid extraction pipe is provided at the upper end of the outer cylinder. The first liquid extraction pipe is connected to a connector and is equipped with an electronic valve. The first liquid extraction pipe is located above the first filter screen. A second liquid inlet pipe is connected to the middle position of the outer cylinder. A solenoid valve is installed inside the second liquid inlet pipe. The outlet of the second liquid inlet pipe is located between the first filter screen and the baffle plate. The second liquid inlet pipe passes through and extends to the outside of the outer cylinder. An arc-shaped pipe connected to the two second liquid inlet pipes is fixedly arranged on the outer wall of the outer cylinder. A second connecting pipe is connected to the middle position of the arc-shaped pipe. A third connecting pipe is provided in the middle of the second connecting pipe. Valves are respectively provided in the middle of the third connecting pipe and the upper end of the second connecting pipe. A liquid inlet hopper is connected to the upper end of the second connecting pipe. The liquid inlet hopper is fixed to the outer wall of the outer cylinder. A control group is installed at the baffle plate. A drive group for use with the control group is installed at the lower end of the control group.

[0007] The control assembly includes a rotating shaft rotatably connected to a baffle plate. A one-way bearing is provided between the rotating shaft and the baffle plate. A second scraper is fixedly installed at the upper end of the rotating shaft. A pressure sensor is installed on the inner wall of the outer cylinder at the position of the second scraper. The second scraper is in contact with the upper surface of the baffle plate. A turntable is fixedly installed at the middle position of the rotating shaft. Both the turntable and the outer wall of the baffle plate have sewage outlets with the same structure. The sewage outlets are long and thin. The turntable and the baffle plate are tightly fitted together. A non-standard gear is fixedly installed at the lower end of the turntable. The teeth of the non-standard gear are wedge-shaped. Sealing rubber is provided on the side wall of the turntable.

[0008] Furthermore, the piston assembly includes a piston cylinder, inside which a wear-resistant cylinder is installed. A piston is slidably connected inside the wear-resistant cylinder. A piston rod is installed at the central axis of the piston. The piston is mounted to the lower end of the piston rod by a locking bolt. The piston rod passes through the piston cylinder and extends to the outside. One end of the piston rod located outside the piston cylinder is rotatably connected to a crankshaft. A first liquid inlet pipe and a first connecting pipe are symmetrically provided at the upper end of the piston cylinder. The first liquid inlet pipe communicates with a connector. The first liquid inlet pipe and the first connecting pipe are rotatably connected to the piston cylinder. A one-way valve is provided inside the first liquid inlet pipe and the first connecting pipe. A compression ring for use with the drive assembly is fixedly provided at the lower end of the piston cylinder. A sealing cap is threadedly connected to the lower end of the compression ring. A sealing ring is provided between the sealing cap and the piston cylinder.

[0009] Furthermore, the fine filtration assembly includes an arc-shaped plate, a mounting bracket fixedly mounted on the outer wall of the arc-shaped plate, the mounting bracket being fixedly connected to the outer cylinder, side plates fixedly mounted on both sides of the arc-shaped plate, a first scraper slidably mounted inside the arc-shaped plate, a first fixing rod fixedly mounted at both ends of the first scraper, one end of the first fixing rod being fixed to the outer wall of the piston cylinder, a third filter screen fixedly mounted in the middle of the arc-shaped plate, the third filter screen being arc-shaped and always in contact with the first scraper, a discharge groove being opened at both ends of the third filter screen, the lowest point of the discharge groove being lower than the swing limit height of the first scraper, a collection hopper fixedly mounted at the lower end of the arc-shaped plate, the collection hopper being located at the lower end of the third filter screen, and a second drain pipe fixedly mounted at the lower end of the collection hopper.

[0010] Furthermore, the drive assembly includes a second fixing rod fixed to the inner wall of the outer cylinder. A guide cylinder is slidably sleeved on one end of the second fixing rod. A pressing block is fixedly installed on the end of the guide cylinder away from the second fixing rod. The pressing block passes through the outer cylinder and extends to the outside to cooperate with the extrusion ring. The pressing block is slidably connected to the outer cylinder. A second spring is placed inside the guide cylinder. A locking box is fixedly installed on the upper end of the outer wall of the guide cylinder. A wedge block is movably installed on the side of the locking box near the non-standard gear. A third spring that pushes the wedge block to reset is placed inside the locking box.

[0011] Furthermore, the drainage assembly includes a sealing cylinder fixed in the middle of the first connecting pipe. The sealing cylinder is fixed inside the outer cylinder by a bracket. A liquid guide pipe is fixedly provided at the lower end of the sealing cylinder. The liquid guide pipe is connected to the first connecting pipe. A drainage box is fixedly provided at the lower end of the liquid guide pipe. Two sets of drainage holes are opened at the lower end of the drainage box. The water spray holes are opened in an inverted V shape.

[0012] Furthermore, a processor is installed inside the control box. The output of the processor is electrically connected to each solenoid valve, and the input of the processor is connected to the output of the pressure sensor.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This invention uses a piston assembly to draw liquid. Before drawing the liquid, a preliminary filter is performed to prevent metal particles from entering, thus protecting the inner cavity of the piston cylinder. At the same time, the sealing cap is threadedly connected to the compression ring and can be opened by screwing, making it convenient for workers to replace the wear-resistant cylinder and piston. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal structure of the cutting fluid filtration and recovery system for CNC machine tools proposed in this invention.

[0016] Figure 2This is a schematic diagram of the external casing of the cutting fluid filtration and recovery system for CNC machine tools proposed in this invention;

[0017] Figure 3 This is a schematic diagram of the piston assembly swing limit position of the cutting fluid filtration and recovery system for CNC machine tools proposed in this invention;

[0018] Figure 4 This is a schematic diagram of the first scraper structure of the cutting fluid filtration and recovery system for CNC machine tools proposed in this invention;

[0019] Figure 5 This is a schematic diagram of the primary filtration component of the cutting fluid filtration and recovery system for CNC machine tools proposed in this invention;

[0020] Figure 6 This is a schematic diagram of the control group structure of the cutting fluid filtration and recovery system for CNC machine tools proposed in this invention;

[0021] Figure 7 This is a schematic diagram of the wedge block structure of the cutting fluid filtration and recovery system for CNC machine tools proposed in this invention;

[0022] Figure 8 This is a schematic diagram of the piston assembly structure of the cutting fluid filtration and recovery system for CNC machine tools proposed in this invention.

[0023] In the diagram: 1. Housing; 2. Crankshaft; 3. Piston assembly; 301. Piston cylinder; 302. Piston; 303. Piston rod; 304. First inlet pipe; 305. First connecting pipe; 306. Extrusion ring; 307. Sealing cap; 308. Wear-resistant cylinder; 4. Connector; 5. Drainage assembly; 501. Sealing cylinder; 502. Guide pipe; 503. Drainage box; 6. Control box; 7. Fine filtration assembly; 701. Arc plate; 7011. Mounting bracket; 702. Third filter screen; 703. Feed trough; 704. Collection hopper; 705. Second drain pipe; 706. First scraper; 707. First fixing rod; 8. Second filter screen; 9. Primary filtration assembly ; 901, Outer cylinder; 902, First suction pipe; 903, First filter screen; 904, Second inlet pipe; 905, Baffle plate; 906, Control group; 9061, Non-standard gear; 9062, Rotating shaft; 9063, Turntable; 9064, Sealing rubber; 9065, Second scraper; 907, Drive group; 9071, Pressing block; 9072, Guide cylinder; 9073, Locking box; 9074, Second fixing rod; 9075, Third spring; 9076, Wedge block; 908, Arc-shaped tube; 909, Second connecting pipe; 910, Third connecting pipe; 911, Inlet hopper; 912, Drain outlet; 10, Sealing plate; 11, Second suction pipe. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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.

[0026] Reference Figure 1-8 A cutting fluid filtration and recovery system for CNC machine tools includes a liquid suction filter box 1. A control box 6 is installed on the outer wall of the box 1. A crankshaft 2 is rotatably installed inside the box 1. One end of the crankshaft 2 is connected to the output shaft of a motor. A slag discharge port is opened on the side wall of the box 1. A sealing plate 10 is installed at the slag discharge port. Two sets of piston assemblies 3 are rotatably connected to the outer wall of the crankshaft 2. A first connecting pipe 305 is installed between the upper ends of the two sets of piston assemblies 3. A liquid discharge assembly 5 is installed in the middle of the first connecting pipe 305. A fine filter assembly 7 is installed between the two sets of piston assemblies 3. A primary filter assembly 9 is installed on both sides of the box 1 to cooperate with the piston assembly 3. A connector 4 is installed between the piston assembly 3 and the primary filter assembly 9. A T-shaped hole is provided inside the connector 4. The connector 4 is connected to the piston assembly 3 and the primary filter assembly 9 respectively. A second filter screen 8 is installed at the lower end of the box 1. A second liquid suction pipe 11 is installed inside the box 1. The second liquid suction pipe 11 is connected to the connector 4. A solenoid valve is installed inside the second liquid suction pipe 11.

[0027] The primary filtration assembly 9 includes an outer cylinder 901. Inside the outer cylinder 901, a first filter screen 903 and a barrier plate 905 are fixedly arranged from top to bottom. A first suction pipe 902 is located at the upper end of the outer cylinder 901, connected to a connector 4 and equipped with an electronic valve. The first suction pipe 902 is positioned above the first filter screen 903. A second inlet pipe 904 is connected to the middle of the outer cylinder 901, and a solenoid valve is installed inside the second inlet pipe 904. The outlet of the second inlet pipe 904 is located between the first filter screen 903 and the barrier plate 905. The second inlet pipe 904 penetrates and extends into the outer cylinder 901. 01 Externally, an arc-shaped pipe 908 is fixedly installed on the outer wall of the outer cylinder 901, which is connected to two second liquid inlet pipes 904. A second connecting pipe 909 is connected in the middle of the arc-shaped pipe 908. A third connecting pipe 910 is installed in the middle of the second connecting pipe 909. Valves are respectively installed in the middle of the third connecting pipe 910 and the upper end of the second connecting pipe 909. The upper end of the second connecting pipe 909 is connected to the liquid inlet 911. The liquid inlet 911 is fixed to the outer wall of the outer cylinder 901. A control group 906 is installed at the baffle plate 905. A drive group 907 for use with the control group 906 is installed at the lower end of the control group 906.

[0028] The control unit 906 includes a rotating shaft 9062 rotatably connected to the baffle plate 905. A one-way bearing is provided between the rotating shaft 9062 and the baffle plate 905. A second scraper 9065 is fixedly installed at the upper end of the rotating shaft 9062. A pressure sensor is installed on the inner wall of the outer cylinder 901 at the position of the second scraper 9065. The second scraper 9065 is in contact with the upper surface of the baffle plate 905. A turntable 9063 is fixedly installed at the middle position of the rotating shaft 9062. Both the turntable 9063 and the outer wall of the baffle plate 905 have a drain port 912 with the same structure. The drain port 912 is slender. The turntable 9063 and the baffle plate 905 are in close contact. A non-standard gear 9061 is fixedly installed at the lower end of the turntable 9063. The teeth of the non-standard gear 9061 are wedge-shaped. Sealing rubber 9064 is provided on the side wall of the turntable 9063.

[0029] Furthermore, the piston assembly 3 includes a piston cylinder 301, inside which a wear-resistant cylinder 308 is installed. A piston 302 is slidably connected inside the wear-resistant cylinder 308. A piston rod 303 is installed at the central axis of the piston 302. The piston 302 is installed on the lower end of the piston rod 303 by locking bolts. The piston rod 303 passes through the piston cylinder 301 and extends to the outside. The end of the piston rod 303 located outside the piston cylinder 301 is rotatably connected to the crankshaft 2. A first inlet pipe 304 and a first connecting pipe 30 are symmetrically installed on the upper end of the piston cylinder 301. 5. The piston cylinder 301 is rotatably connected to the first liquid inlet pipe 304 and the first connecting pipe 305 respectively. The first liquid inlet pipe 304 is connected to the connector 4. The first liquid inlet pipe 304 and the first connecting pipe 305 are rotatably connected to the piston cylinder 301. The first liquid inlet pipe 304 and the first connecting pipe 305 are both equipped with one-way valves. The lower end of the piston cylinder 301 is fixedly equipped with a compression ring 306 for use with the drive assembly 907. The lower end of the compression ring 306 is threadedly connected to a sealing cap 307. A sealing ring is provided between the sealing cap 307 and the piston cylinder 301.

[0030] The motor output shaft drives the crankshaft 2 to rotate, the crankshaft 2 drives the piston assembly 3 to swing, and drives the piston rod 303 to reciprocate. When the piston rod 303 moves to the outside of the piston cylinder 301, the piston 302 moves. Because the first liquid inlet pipe 304 and the first connecting pipe 305 are both equipped with one-way valves, the liquid inside the piston cylinder 301 will enter the first connecting pipe 305, and conversely, the cutting fluid inside the second liquid inlet pipe 904 will be drawn into the piston cylinder 301.

[0031] Furthermore, the fine filtration assembly 7 includes an arc-shaped plate 701, with a mounting bracket 7011 fixedly disposed on the outer wall of the arc-shaped plate 701. The mounting bracket 7011 is fixedly connected to the outer cylinder 901. Side plates are fixedly disposed on both sides of the arc-shaped plate 701. A first scraper 706 is slidably disposed inside the arc-shaped plate 701. First fixing rods 707 are fixedly disposed at both ends of the first scraper 706. One end of the first fixing rod 707 is fixed to the outer wall of the piston cylinder 301. The middle of the arc-shaped plate 701... A third filter screen 702 is fixedly installed at a certain position. The third filter screen 702 is arc-shaped and always fits against the first scraper 706. A discharge trough 703 is opened at both ends of the third filter screen 702. The lowest point of the discharge trough 703 is lower than the swing limit height of the first scraper 706. A collection hopper 704 is fixedly installed at the lower end of the arc-shaped plate 701. The collection hopper 704 is located at the lower end of the third filter screen 702. A second drain pipe 705 is fixedly installed at the lower end of the collection hopper 704.

[0032] Furthermore, the drive assembly 907 includes a second fixing rod 9074 fixed to the inner wall of the outer cylinder 901. One end of the second fixing rod 9074 is slidably fitted with a guide cylinder 9072. The end of the guide cylinder 9072 away from the second fixing rod 9074 is fixedly provided with a pressing block 9071. The pressing block 9071 passes through the outer cylinder 901 and extends to the outside to cooperate with the compression ring 306. The pressing block 9071 is slidably connected to the outer cylinder 901. A second spring is placed inside the guide cylinder 9072. A locking box 9073 is fixedly provided at the upper end of the outer wall of the guide cylinder 9072. A wedge block 9076 is movably installed on the side of the locking box 9073 near the non-standard gear 9061. A third spring 9075 is placed inside the locking box 9073 to push the wedge block 9076 to reset.

[0033] Furthermore, the drainage assembly 5 includes a sealing cylinder 501 fixed in the middle of the first connecting pipe 305. The sealing cylinder 501 is fixed inside the outer cylinder 901 by a bracket. A liquid guide pipe 502 is fixedly provided at the lower end of the sealing cylinder 501. The liquid guide pipe 502 is connected to the first connecting pipe 305. A drainage box 503 is fixedly provided at the lower end of the liquid guide pipe 502. Two sets of drainage holes are opened at the lower end of the drainage box 503. The water spray holes are opened in an inverted V shape. Through the V-shaped water spray holes, the cutting fluid is sprayed to the middle position of the third filter screen 702 to prevent the liquid from flowing out from the feed trough 703.

[0034] Furthermore, a processor is installed inside the control box 6. The output of the processor is electrically connected to each solenoid valve, and the input of the processor is connected to the output of the pressure sensor.

[0035] Working principle:

[0036] Filtration: During use, pour the cutting fluid to be processed into the inlet hopper 911, or connect it to the third connecting pipe 910 via a hose. When fluid is introduced through the inlet hopper 911, the valve inside the third connecting pipe 910 must be closed; conversely, close the valve at the upper end of the second connecting pipe 909. The motor starts working, and the motor output shaft drives the crankshaft 2 to rotate. The crankshaft 2 drives the piston assembly 3 to swing and begin drawing in fluid. The cutting fluid enters the arc-shaped pipe 908 from the second connecting pipe 909, and then enters the second inlet pipe 904 from inside the arc-shaped pipe 908. The cutting fluid accumulates inside the outer cylinder 901 until it is drawn in by the first suction pipe 902. The liquid enters the piston cylinder 301, while metal particles are blocked and accumulated inside the outer cylinder 901 by the first filter screen 903. Then it enters the first connecting pipe 305, flows into the guide pipe 502, enters the drain box 503, and finally flows to the surface of the third filter screen 702. The metal residue particles are filtered by the third filter screen 702 and left on the surface of the third filter screen 702. The cutting fluid enters the collection hopper 704, then enters the second drain pipe 705, and flows to the storage tank through the second drain pipe 705. The storage tank is installed outside the box body 1, thus completing the filtration.

[0037] Slag discharge 1: When the piston assembly 3 reciprocates, the piston assembly 3 will drive the first fixed rod 707 to move, and the first fixed rod 707 will drive the first scraper 706 to move, pushing the particles on the surface of the third filter screen 702 into the feed trough 703, thereby cleaning the surface of the third filter screen 702 and preventing the accumulation of particles on the surface of the third filter screen 702.

[0038] Slag discharge 2: When the piston assembly 3 reciprocates, the extrusion ring 306 will strike the pressing block 9071, causing the pressing block 9071 to move into the outer cylinder 901. The pressing block 9071 drives the guide cylinder 9072 to move, and the guide cylinder 9072 drives the locking box 9073 and the wedge block 9076 to move. Since a one-way bearing is provided between the baffle plate 905 and the rotating shaft 9062, the wedge block 9076 can only drive the non-standard gear 9061 to rotate in one direction. The non-standard gear 9061 drives the rotating shaft 9062 to rotate, and the rotating shaft 9062 drives the turntable 9063 to rotate. When the turntable 9063 overlaps with the drain port 912 of the baffle plate 905, the liquid inside the outer cylinder 901 will flow out from the drain port 912.

[0039] At the same time, when the shaft 9062 rotates, it will drive the second scraper 9065 to move, and push the metal particles on the surface of the barrier plate 905 to the drain outlet 912 through the second scraper 9065.

[0040] At the same time, when the turntable 9063 overlaps with the drain port 912 of the baffle plate 905, the second scraper 9065 is also located at the drain port 912. The second scraper 9065 will squeeze the pressure sensor. The pressure sensor will transmit an electrical signal to the processor under pressure. The processor controls the solenoid valve inside the first liquid extraction pipe 902 to close and controls the solenoid valve inside the second liquid extraction pipe 11 to open. At this time, the piston assembly 3 will suck in the cutting fluid at the bottom of the box 1 and guide it to the fine filter assembly 7.

[0041] Liquid is drawn in through piston assembly 3. Before the liquid is drawn in, it is initially filtered to prevent metal particles from entering, thus protecting the inner cavity of piston cylinder 301. At the same time, sealing cover 307 is threadedly connected to extrusion ring 306 and can be opened by screwing, making it convenient for staff to replace wear-resistant cylinder 308 and piston 302.

[0042] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A cutting fluid filtration and recovery system for CNC machine tools, comprising a housing (1) of a suction filter box, wherein a control box (6) is installed on the outer wall of the housing (1), and a crankshaft (2) is rotatably mounted inside the housing (1), one end of the crankshaft (2) being connected to a motor output shaft, and a slag discharge port is provided on the side wall of the housing (1), wherein a sealing plate (10) is provided at the slag discharge port, characterized in that, Two sets of piston assemblies (3) are rotatably connected to the outer wall of the crankshaft (2). A first connecting pipe (305) is provided between the upper ends of the two sets of piston assemblies (3). A drain assembly (5) is provided in the middle of the first connecting pipe (305). A fine filter assembly (7) is provided between the two sets of piston assemblies (3). A primary filter assembly (9) is installed on both sides of the housing (1). A connector (4) is provided between the piston assembly (3) and the primary filter assembly (9). A T-shaped hole is provided inside the connector (4). The connector (4) is connected to the piston assembly (3) and the primary filter assembly (9) respectively. A second filter screen (8) is provided at the lower end of the housing (1). A second liquid extraction pipe (11) is provided inside the housing (1). The second liquid extraction pipe (11) is connected to the connector (4). A solenoid valve is installed inside the second liquid extraction pipe (11). The primary filtration assembly (9) includes an outer cylinder (901). A first filter screen (903) and a barrier plate (905) are fixedly arranged inside the outer cylinder (901) from top to bottom. A first liquid extraction pipe (902) is provided at the upper end of the outer cylinder (901). The first liquid extraction pipe (902) is connected to a connector (4) and equipped with an electronic valve. A second liquid inlet pipe (904) is connected to the middle position of the outer cylinder (901). A solenoid valve is installed inside the second liquid inlet pipe (904). The second liquid inlet pipe (904) penetrates and extends to the outside of the outer cylinder (901). The outer wall of the outer cylinder (901) is fixedly equipped with two second liquid inlet pipes (904). An arc-shaped pipe (908) is connected to the outer cylinder (901). A second connecting pipe (909) is connected to the middle of the arc-shaped pipe (908). A third connecting pipe (910) is provided in the middle of the second connecting pipe (909). Valves are respectively provided in the middle of the third connecting pipe (910) and the upper end of the inner part of the second connecting pipe (909). An inlet hopper (911) is connected to the upper end of the second connecting pipe (909). The inlet hopper (911) is fixed to the outer wall of the outer cylinder (901). A control group (906) is installed at the baffle plate (905). A drive group (907) for use with the control group (906) is installed at the lower end of the control group (906). The control unit (906) includes a rotating shaft (9062) rotatably connected to the baffle plate (905). A one-way bearing is provided between the rotating shaft (9062) and the baffle plate (905). A second scraper (9065) is fixedly provided at the upper end of the rotating shaft (9062). A pressure sensor is installed on the inner wall of the outer cylinder (901) at the position of the second scraper (9065). A turntable (9063) is fixedly installed at the middle position of the rotating shaft (9062). The outer walls of the turntable (9063) and the baffle plate (905) are both provided with sewage outlets (912) with the same structure. The turntable (9063) and the baffle plate (905) are tightly fitted together. A non-standard gear (9061) is fixedly provided at the lower end of the turntable (9063). Sealing rubber (9064) is provided on the side wall of the turntable (9063). The piston assembly (3) includes a piston cylinder (301), inside which a wear-resistant cylinder (308) is installed. A piston (302) is slidably connected inside the wear-resistant cylinder (308). A piston rod (303) is installed at the central axis of the piston (302). The piston rod (303) passes through the piston cylinder (301) and extends to the outside. One end of the piston rod (303) located outside the piston cylinder (301) is rotatably connected to the crankshaft (2). A first liquid inlet pipe (304) is symmetrically provided at the upper end of the piston cylinder (301). The first inlet pipe (304) and the first connecting pipe (305) are connected to the connector (4). The first inlet pipe (304) and the first connecting pipe (305) are rotatably connected to the piston cylinder (301). The first inlet pipe (304) and the first connecting pipe (305) are both equipped with one-way valves. The lower end of the piston cylinder (301) is fixedly equipped with a compression ring (306). The lower end of the compression ring (306) is threadedly connected with a sealing cap (307). A sealing ring is provided between the sealing cap (307) and the piston cylinder (301). The fine filtration assembly (7) includes an arc-shaped plate (701), on the outer wall of which a mounting bracket (7011) is fixedly mounted. The mounting bracket (7011) is fixedly connected to the outer cylinder (901). Side plates are fixedly mounted on both sides of the arc-shaped plate (701). A first scraper (706) is slidably mounted inside the arc-shaped plate (701). A first fixing rod (707) is fixedly mounted at both ends of the first scraper (706). One end of the first fixing rod (707) is fixed to the outside of the piston cylinder (301). The wall has a third filter screen (702) fixedly installed in the middle of the arc plate (701). The third filter screen (702) is arc-shaped and always fits against the first scraper (706). The two ends of the third filter screen (702) are respectively provided with a feeding groove (703). The lowest point of the feeding groove (703) is lower than the swing limit height of the first scraper (706). The lower end of the arc plate (701) is fixedly provided with a collection hopper (704), and the lower end of the collection hopper (704) is fixedly provided with a second drain pipe (705).

2. The cutting fluid filtration and recovery system for CNC machine tools according to claim 1, characterized in that, The drive assembly (907) includes a second fixing rod (9074) fixed to the inner wall of the outer cylinder (901). A guide cylinder (9072) is slidably sleeved on one end of the second fixing rod (9074). A pressing block (9071) is fixedly installed on the end of the guide cylinder (9072) away from the second fixing rod (9074). The pressing block (9071) passes through the outer cylinder (901) and extends to the outside to cooperate with the extrusion ring (306). The pressing block (9071) is slidably connected to the outer cylinder (901). A second spring is placed inside the guide cylinder (9072). A locking box (9073) is fixedly installed on the upper end of the outer wall of the guide cylinder (9072). A wedge block (9076) is movably installed on the side of the locking box (9073) near the non-standard gear (9061). A third spring (9075) is placed inside the locking box (9073) to push the wedge block (9076) to reset.

3. The cutting fluid filtration and recovery system for CNC machine tools according to claim 1, characterized in that, The drainage assembly (5) includes a sealing cylinder (501) fixed in the middle of the first connecting pipe (305). The sealing cylinder (501) is fixed inside the outer cylinder (901) by a bracket. A liquid guide pipe (502) is fixedly provided at the lower end of the sealing cylinder (501). A drainage box (503) is fixedly provided at the lower end of the liquid guide pipe (502). Two sets of drainage holes are provided at the lower end of the drainage box (503).

4. The cutting fluid filtration and recovery system for CNC machine tools according to claim 1, characterized in that, The control box (6) is equipped with a processor. The output of the processor is electrically connected to each solenoid valve, and the input of the processor is connected to the output of the pressure sensor.

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