A cutting fluid centralized supply and return device

Abstract

The utility model relates to cutting fluid supply and return technical field discloses a kind of cutting fluid centralized supply and return device, including liquid supply tank, the right side of the liquid supply tank is fixedly connected with shunt tank, the upper surface of the liquid supply tank is fixedly connected with first cutting fluid pump, the output end of the first cutting fluid pump is fixedly communicated with supply pipeline, the outer surface of the supply pipeline is fixedly communicated with first flow control valve, the device is by setting first filter pipeline, second filter pipeline and filter drum, built-in with semicircle clamping groove clamping coarse, fine filter screen, cooperate second turbidity sensor, third cutting fluid pump and second cutting fluid pump, when detecting that filtering is substandard, PLC programmable controller closes second cutting fluid pump, opens third cutting fluid pump, makes that substandard cutting fluid is guided back to back liquid main pipe circulation filtering by backflow pipe, avoid impurity residue, ensure that cutting fluid is clean, solve single filtration cannot secondary processing problem, reduce tool wear and workpiece scratch.

Description

Technical Field

[0001] This utility model relates to the field of cutting fluid supply and return technology, and more specifically, to a centralized cutting fluid supply and return device. Background Technology

[0002] Cutting fluid supply and recycling refers to a series of operations that deliver cutting fluid to the machining area and recycle the used cutting fluid to meet the cutting fluid demand during the machining process. Cutting fluid can cool and lubricate the cutting tools and workpieces, and can also flush away the chips generated during machining, thereby improving machining quality and tool life. Typically, the traditional cutting fluid supply and recycling method is to equip each machining equipment with a separate cutting fluid supply and recycling system. The equipment includes its own reservoir, pump, filter, etc. In actual machining production, the operator operates these devices to supply cutting fluid to the corresponding machine tool. The used cutting fluid then flows back to the reservoir through the corresponding return pipeline for subsequent reuse.

[0003] While existing centralized supply and recycling systems enable centralized supply and recycling of cutting fluid from multiple machines, most currently employ a single filtration device to uniformly filter the centrally recycled cutting fluid. Due to significant differences in chip size and impurity content generated by different processing equipment, the mixed recycled fluid contains both fine grinding debris and large iron filings. If a single filtration device uses a fine filter screen, it is easily clogged by large impurities, requiring frequent shutdowns for cleaning and affecting production continuity. If a coarse filter screen is used, it cannot effectively filter fine particles, causing the recycled cutting fluid to carry impurities into the processing area, exacerbating tool wear and workpiece surface scratches, reducing machining accuracy, shortening the service life of the cutting fluid, and increasing replacement frequency and production costs. Utility Model Content

[0004] (a) Technical problems to be solved In view of the above situation and to overcome the defects of the prior art, this utility model provides a cutting fluid centralized supply and return device, which aims to solve the problems in the background art.

[0005] (II) Technical Solution To achieve the above objectives, this application provides the following technical solution: a centralized cutting fluid supply and return device, comprising a supply tank, a distribution box fixedly connected to the right side of the supply tank, a first cutting fluid pump fixedly connected to the upper surface of the supply tank, a supply pipe fixedly connected to the output end of the first cutting fluid pump, a first flow control valve fixedly connected to the outer surface of the supply pipe, five distribution pipes fixedly connected to the bottom end of the distribution box, a second flow control valve fixedly connected to the outer surface of each distribution pipe, a second cutting fluid pump fixedly connected to the rear upper surface of the supply tank, a main connecting pipe fixedly connected to the input end of the second cutting fluid pump, a first filter pipe and a second filter pipe fixedly connected to the end of the main connecting pipe away from the second cutting fluid pump, the bottom ends of the first filter pipe and the second filter pipe together fixedly connected to a return main pipe, five return branch pipes fixedly connected to the end of the return main pipe near the distribution box, and the outer surfaces of the first filter pipe and the second filter pipe fixedly connected to... The system includes filter cartridges, each with a removable cover bolted to its back. Three coarse filter screens and three fine filter screens are fixedly connected to the inner walls of the two removable covers. Each filter cartridge has three semi-circular slots on its inner wall. A flow sensor, a pressure sensor, and a first turbidity sensor are fixedly connected to the end of the main return pipe near one of the five return branch pipes. The first and second filter pipes are located at the ends away from the five return branch pipes. A second turbidity sensor and a third flow control valve are fixedly connected to the outer surfaces of both the first and second filter pipes. A first return pipe and a second return pipe are fixedly connected to the outer surfaces of the first and second filter pipes near the main connecting pipe, respectively. A third cutting fluid pump is fixedly connected to the outer surfaces of the first and second return pipes near the first filter pipe and the second return pipe near the second filter pipe. A PLC programmable controller is fixedly connected to the front of the supply tank.

[0006] The present invention is further configured such that the input end of the first cutting fluid pump extends into the interior of the supply tank, the end of the supply pipe away from the first cutting fluid pump extends into the interior of the distribution tank, the output end of the second cutting fluid pump extends into the interior of the supply tank, the outer surface of each coarse filter screen and the outer surface of each fine filter screen are engaged with the interior of the semi-circular slot, each second turbidity sensor is located above the filter cylinder, each third flow control valve is located below the filter cylinder, the end of the first return pipe away from the first filter pipe and the end of the second return pipe away from the second filter pipe are both fixedly connected to the outer surface of the return main pipe, the first return pipe and the second return pipe are both located in the middle of the first turbidity sensor and the first filter pipe, and the PLC programmable controller is electrically connected to the first cutting fluid pump, the first flow control valve, the second flow control valve, the second cutting fluid pump, the flow sensor, the pressure sensor, the first turbidity sensor, the second turbidity sensor, the third flow control valve and the third cutting fluid pump respectively through wires.

[0007] The present invention is further configured such that a base is fixedly connected to the bottom surface of the liquid supply tank, and the upper surface of the base is in contact with the outer surfaces of the five return pipes and the outer surface of the return main pipe.

[0008] The present invention is further configured such that a support base is fixedly connected to the outer right side surface of the diversion box, and the bottom surface of the support base is fixedly connected to the upper surface of the base.

[0009] The present invention is further provided that a scale plate is provided on the outside of the liquid supply tank, and the outer surface of the scale plate is fixedly connected to the inner wall of the front of the liquid supply tank.

[0010] The present invention is further configured such that an injection pipe is fixedly connected to the upper surface of the liquid supply tank, and a discharge pipe is fixedly connected to the lower back of the liquid supply tank.

[0011] (III) Beneficial Effects Compared with the prior art, the beneficial effects of this utility model are: 1. By setting up a first filter pipe, a second filter pipe, and corresponding filter cylinders, with coarse and fine filter screens respectively installed in the filter cylinders and engaging with semi-circular slots, and in conjunction with a second turbidity sensor, a third cutting fluid pump, and a second cutting fluid pump, when the second turbidity sensor detects that the filtered cutting fluid is substandard, the PLC programmable controller will automatically shut down the second cutting fluid pump and turn on the third cutting fluid pump, so that the substandard cutting fluid is guided back to the main return pipe through the first or second return pipe and re-enters the filter pipe for circulation filtration. This achieves a filtration detection effect of detection, judgment, and circulation, enabling repeated filtration of substandard cutting fluid, avoiding impurity residue due to incomplete filtration in a single step, ensuring that the cleanliness of the cutting fluid entering the supply tank meets the requirements, solving the problem that existing single filtration devices cannot perform secondary treatment of substandard liquids, ensuring the cooling and lubrication effect of the cutting fluid during processing, and reducing tool wear and workpiece surface scratches; 2. By presetting the threshold number of filtration cycles using a PLC programmable controller, and coordinating with flow sensors, pressure sensors, and the on / off control of dual filtration pipelines, if the required number of filtration cycles still fails to meet the standard after reaching the threshold, the PLC programmable controller will automatically adjust the corresponding third flow control valve to open the coarse and fine filtration channels. This allows the cutting fluid to pass through the coarse filter to intercept large impurities and the fine filter to filter fine particles, achieving multi-stage deep filtration. By automatically switching filtration channels based on the number of cycles, it can specifically address the problem of filtration failure caused by stubborn impurities, avoiding the waste of energy due to repeated cycles caused by insufficient precision of a single filter. At the same time, it eliminates the need for manual adjustment of the filtration mode, reducing labor costs and ensuring filtration efficiency and precision. Furthermore, it avoids the shortcomings of existing centralized supply and return devices that cannot adapt to complex return fluid compositions due to fixed filtration modes, ensuring production continuity and processing quality stability. Attached Figure Description

[0012] Figure 1 This is a three-dimensional overall structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the liquid return main pipe of this utility model; Figure 3 This is a three-dimensional structural diagram of the coarse filter screen and the fine filter screen of this utility model; Figure 4 This is a three-dimensional structural diagram of the semi-circular slot of this utility model.

[0013] In the diagram: 1. Liquid supply tank; 2. PLC programmable controller; 3. Discharge pipe; 4. Scale plate; 5. First cutting fluid pump; 6. Supply pipe; 7. First flow control valve; 8. Second flow control valve; 9. Diverter pipe; 10. Return pipe; 11. Support base; 12. Base; 13. Diverter box; 14. First return pipe; 15. First filter pipe; 16. Main connecting pipe; 17. Third cutting fluid pump; 18. Injection pipe; 19. Second cutting fluid pump; 20. Main return pipe; 21. Flow sensor; 22. Pressure sensor; 23. First turbidity sensor; 24. Second return pipe; 25. Third flow control valve; 26. Removal cover; 27. Second turbidity sensor; 28. Filter cartridge; 29. ​​Second filter pipe; 30. Coarse filter screen; 31. Fine filter screen; 32. Semi-circular slot. Detailed Implementation

[0014] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0015] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0016] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0017] Please see Figures 1-4The system includes a fluid supply tank 1, a distribution box 13 fixedly connected to the right side of the fluid supply tank 1, a first cutting fluid pump 5 fixedly connected to the upper surface of the fluid supply tank 1, a supply pipe 6 fixedly connected to the output end of the first cutting fluid pump 5, a first flow control valve 7 fixedly connected to the outer surface of the supply pipe 6, five distribution pipes 9 fixedly connected to the bottom end of the distribution box 13, a second flow control valve 8 fixedly connected to the outer surface of each distribution pipe 9, and a second cutting fluid pump 19 fixedly connected to the upper rear surface of the fluid supply tank 1. The input end of the second cutting fluid pump 19 is fixedly connected to... A main connecting pipe 16 is provided. The end of the main connecting pipe 16 furthest from the second cutting fluid pump 19 is fixedly connected to a first filter pipe 15 and a second filter pipe 29. The bottom ends of the first filter pipe 15 and the second filter pipe 29 are both fixedly connected to a return main pipe 20. Five return branch pipes 10 are fixedly connected to the end of the return main pipe 20 near the distribution box 13. Filter cartridges 28 are fixedly connected to the outer surfaces of both the first filter pipe 15 and the second filter pipe 29. The back of each filter cartridge 28 is fixedly connected to a bolt. The inner walls of the two disassembly covers 26 are respectively fixedly connected to three coarse filter screens 30 and three fine filter screens 31. Each filter cylinder 28 has three semi-circular slots 32 on its inner wall. The end of the main return pipe 20 near the five return branch pipes 10 is respectively fixedly connected to a flow sensor 21, a pressure sensor 22, and a first turbidity sensor 23. The first filter pipe 15 and the second filter pipe 29 are both located at the end away from the five return branch pipes 10. The outer surfaces of the first filter pipe 15 and the second filter pipe 29 are... A second turbidity sensor 27 and a third flow control valve 25 are fixedly connected. The outer surface of the first filter pipe 15 near the main connecting pipe 16 and the outer surface of the second filter pipe 29 near the main connecting pipe 16 are respectively fixedly connected to a first return pipe 14 and a second return pipe 24. The outer surface of the first return pipe 14 near the first filter pipe 15 and the outer surface of the second return pipe 24 near the second filter pipe 29 are both fixedly connected to a third cutting fluid pump 17. A PLC programmable controller 2 is fixedly connected to the front of the fluid supply tank 1.

[0018] Specifically, cutting fluid is stored in the supply tank 1. Starting the first cutting fluid pump 5 pumps the cutting fluid from the supply tank 1 into the supply pipe 6. Adjusting the first flow control valve 7 controls the total flow rate of the cutting fluid in the supply pipe 6. After entering the distribution box 13 via the supply pipe 6, the cutting fluid is distributed to various processing equipment through five distribution pipes 9. Adjusting the second flow control valve 8 on each distribution pipe 9 adapts to the fluid supply needs of different equipment. Used cutting fluid flows into the main return pipe 20 through five return pipes 10. Flow sensor 21, pressure sensor 22, and first turbidity sensor 23 monitor the return flow rate, pressure, and initial turbidity, respectively. Subsequently, the cutting fluid enters the first filter pipe 15 or the second filter pipe 29, passing through the filter cartridge 28. The coarse filter 30 or fine filter 31 inside filters impurities. The semi-circular slot 32 positions the filter. The cover 26 can be removed for easy cleaning or replacement of the filter. The second turbidity sensor 27 detects the turbidity of the filtered cutting fluid. The third flow control valve 25 controls the opening and closing of the filter pipe. If the filtration does not meet the standard, the third cutting fluid pump 17 is started to guide the cutting fluid back to the return main pipe 20 for re-filtration through the first return pipe 14 or the second return pipe 24. If the filtration meets the standard, the second cutting fluid pump 19 draws it back to the supply tank 1 through the main connecting pipe 16. The PLC programmable controller 2 realizes the automatic control of each component, which solves the problem that the existing single filtration device cannot balance efficiency and accuracy, and realizes centralized supply and return of cutting fluid and precise filtration.

[0019] Please see Figures 1-4 The input end of the first cutting fluid pump 5 extends into the interior of the supply tank 1. The end of the supply pipe 6 away from the first cutting fluid pump 5 extends into the interior of the distribution box 13. The output end of the second cutting fluid pump 19 extends into the interior of the supply tank 1. The outer surface of each coarse filter screen 30 and the outer surface of each fine filter screen 31 are engaged with the interior of the semi-circular slot 32. Each second turbidity sensor 27 is located above the filter cartridge 28. Each third flow control valve 25 is located below the filter cartridge 28. The end of the first return pipe 14 away from the first filter pipe 15 and the second return pipe 19 are connected to the first filter pipe 15. The end of the flow pipe 24 away from the second filter pipe 29 is fixedly connected to the outer surface of the return main pipe 20. The first return pipe 14 and the second return pipe 24 are both located in the middle of the first turbidity sensor 23 and the first filter pipe 15. The PLC programmable controller 2 is electrically connected to the first cutting fluid pump 5, the first flow control valve 7, the second flow control valve 8, the second cutting fluid pump 19, the flow sensor 21, the pressure sensor 22, the first turbidity sensor 23, the second turbidity sensor 27, the third flow control valve 25, and the third cutting fluid pump 17 through wires.

[0020] Specifically, the input end of the first cutting fluid pump 5 passes through the inside of the supply tank 1 to ensure that cutting fluid can be drawn. The end of the supply pipe 6 away from the first cutting fluid pump 5 passes through the inside of the distribution box 13 to ensure that the cutting fluid can smoothly enter the distribution box 13. The output end of the second cutting fluid pump 19 passes through the inside of the supply tank 1 to ensure that the filtered cutting fluid can be returned to the supply tank 1. The coarse filter screen 30 and the fine filter screen 31 are engaged with the semi-circular slot 32, which not only ensures the stable installation of the filter screen, but also facilitates disassembly and replacement. The second turbidity sensor 27 is located above the filter cylinder 28 to accurately detect the filtration of the cutting fluid. The turbidity of the liquid is controlled by the third flow control valve 25 located below the filter cartridge 28 to facilitate the control of the flow direction of the filtered cutting fluid. The first return pipe 14 and the second return pipe 24 are connected to the return main pipe 20 and are located in the middle of the first turbidity sensor 23 and the first filter pipe 15, ensuring that the substandard cutting fluid can be efficiently returned for re-filtration. The PLC programmable controller 2 is electrically connected to each component through wires, and can receive data from each sensor and control the actions of each pump and valve to realize the automated operation of the device, avoid human operation errors, and further improve the stability and filtration accuracy of the supply and return system.

[0021] Please see Figures 1-4 A base 12 is fixedly connected to the bottom surface of the liquid supply tank 1. The upper surface of the base 12 is in contact with the outer surface of the five return pipes 10 and the outer surface of the return main pipe 20.

[0022] Specifically, by having the upper surface of the base 12 contact the outer surfaces of the five return branch pipes 10 and the return main pipe 20, it can provide stable support for the supply tank 1, preventing it from tipping over, and also support the return branch pipes 10 and the return main pipe 20, preventing the connections from loosening or the pipes from deforming due to their own weight, ensuring the smooth flow of the return pipeline, solving the problem of the lack of support and easy damage to the pipeline in the existing device, and ensuring the continuity of the cutting fluid recovery process.

[0023] Please see Figures 1-4 A support base 11 is fixedly connected to the outer right side of the distribution box 13, and the bottom surface of the support base 11 is fixedly connected to the upper surface of the base 12.

[0024] Specifically, a support base 11 is fixed to the outer right side of the distribution box 13. The bottom surface of the support base 11 is fixedly connected to the upper surface of the base 12, which can provide auxiliary support for the distribution box 13. This prevents the distribution box 13 from bearing its own weight and the weight of the distribution pipe 9 by relying solely on its connection with the supply tank 1. It also prevents the connection between the distribution box 13 and the supply tank 1 from breaking or failing to seal, ensuring that the distribution box 13 stably distributes the cutting fluid. This avoids uneven fluid supply caused by the shaking of the distribution box 13 and ensures normal fluid supply to each processing equipment.

[0025] Please see Figures 1-4A scale plate 4 is provided on the outside of the liquid supply tank 1. The outer surface of the scale plate 4 is fixedly connected to the inner wall of the front of the liquid supply tank 1. An injection pipe 18 is fixedly connected to the upper surface of the liquid supply tank 1, and a discharge pipe 3 is fixedly connected to the lower back of the liquid supply tank 1.

[0026] Specifically, by fixing the scale plate 4 on the outer side of the supply tank 1 to the inner wall of the front of the supply tank 1, the staff can intuitively observe the liquid level of the cutting fluid in the supply tank 1 through the scale plate 4, which is convenient for timely replenishment of cutting fluid and avoids damage to the first cutting fluid pump 5 due to dry running due to low liquid level. The injection pipe 18 on the upper surface of the supply tank 1 provides a convenient channel for replenishing cutting fluid, and the injection can be completed without disassembling other parts. The discharge pipe 3 on the lower back of the supply tank 1 facilitates the discharge of waste liquid when the cutting fluid deteriorates or when the supply tank 1 needs to be cleaned. This solves the problems of inconvenient liquid level observation and cumbersome liquid injection and drainage in the existing device, and improves the convenience of device maintenance.

[0027] Working principle: In use, cutting fluid is first stored in the supply tank 1. The operator can observe the fluid level using the scale plate 4 on the inner wall of the front of the supply tank 1. If the fluid level is insufficient, it is replenished through the injection pipe 18. If the cutting fluid deteriorates or the supply tank 1 needs to be cleaned, it is drained through the discharge pipe 3. The first cutting fluid pump 5 is started, and its input end penetrates the inside of the supply tank 1 to draw cutting fluid, which is then transported to the distribution box 13 through the supply pipe 6. During this process, the total fluid supply can be controlled by adjusting the first flow control valve 7 on the supply pipe 6. The distribution box 13 is connected to the base via the support seat 11 on the right side. The base 12 is fixed and simultaneously supports the supply tank 1, return branch pipe 10, and return main pipe 20 to prevent pipe deformation. After the cutting fluid enters the distribution box 13, it is distributed to each processing equipment through five branch pipes 9. The second flow control valve 8 on each branch pipe 9 can be adapted to the fluid supply needs of different equipment. After use, the cutting fluid flows into the return main pipe 20 through the five return branch pipes 10. The flow sensor 21, pressure sensor 22, and first turbidity sensor 23 on the return main pipe 20 monitor the return flow rate, pressure, and initial turbidity, respectively. The cutting fluid then enters the first filter pipe 15 or the second filter pipe 29. When the cutting fluid flows through the filter cylinder 28, the coarse filter screen 30 or fine filter screen 31 inside engages with the semi-circular slot 32 to achieve filtration. The second turbidity sensor 27 above the filter cylinder 28 detects the turbidity after filtration, and the third flow control valve 25 below controls the opening and closing of the pipe. The disassembly cover 26 on the back of the filter cylinder 28 facilitates subsequent cleaning of the filter screen. If the second turbidity sensor 27 detects that the filtration does not meet the standard, the PLC programmable controller 2 controls the start of the third cutting fluid pump 17, which guides the cutting fluid back to the return main pipe 20 for re-filtration through the first return pipe 14 or the second return pipe 24. If the filtration meets the standard, the PLC programmable controller controls the start of the second cutting fluid pump 19, whose output end passes through the inside of the supply tank 1, and draws the cutting fluid back to the supply tank 1 through the main connecting pipe 16 to complete the circulation. Throughout the process, the PLC programmable controller 2 achieves automated control through wires and electrical connections with each component, solving the problem that existing single filtration devices cannot balance efficiency and accuracy, and ensuring stable centralized supply and return of cutting fluid and accurate filtration.

[0028] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A centralized cutting fluid supply and return device, comprising a fluid supply tank (1), characterized in that: A flow divider (13) is fixedly connected to the right side of the supply tank (1). A first cutting fluid pump (5) is fixedly connected to the upper surface of the supply tank (1). The output end of the first cutting fluid pump (5) is fixedly connected to a supply pipe (6). A first flow control valve (7) is fixedly connected to the outer surface of the supply pipe (6). Five flow dividers (9) are fixedly connected to the bottom end of the flow divider (13). A second flow control valve (8) is fixedly connected to the outer surface of each flow divider (9). A second cutting fluid pump (19) is fixedly connected to the upper rear side of the supply tank (1). The input end of the second cutting fluid pump (19) is fixedly connected to... There is a main connecting pipe (16), and the end of the main connecting pipe (16) away from the second cutting fluid pump (19) is fixedly connected to the first filter pipe (15) and the second filter pipe (29). The bottom end of the first filter pipe (15) and the bottom end of the second filter pipe (29) are fixedly connected to the return main pipe (20). The end of the return main pipe (20) near the distribution box (13) is fixedly connected to five return branch pipes (10). The outer surface of the first filter pipe (15) and the outer surface of the second filter pipe (29) are both fixedly connected to filter cylinders (28). The back of each filter cylinder (28) is fixedly connected to a bolt. The two disassembled covers (26) are respectively fixedly connected to the inner walls of three coarse filter screens (30) and three fine filter screens (31). Each filter cylinder (28) has three semi-circular slots (32) on its inner wall. The end of the return main pipe (20) near the five return branch pipes (10) is respectively fixedly connected to a flow sensor (21), a pressure sensor (22) and a first turbidity sensor (23). The first filter pipe (15) and the second filter pipe (29) are both located at the end away from the five return branch pipes (10). The outer surface of the first filter pipe (15) and the outer surface of the second filter pipe (29) are respectively fixedly connected to the flow sensor (21), the pressure sensor (22) and the first turbidity sensor (23). The surface is fixedly connected to a second turbidity sensor (27) and a third flow control valve (25). The outer surface of the first filter pipe (15) near the main connecting pipe (16) and the outer surface of the second filter pipe (29) near the main connecting pipe (16) are respectively fixedly connected to a first return pipe (14) and a second return pipe (24). The outer surface of the first return pipe (14) near the first filter pipe (15) and the outer surface of the second return pipe (24) near the second filter pipe (29) are both fixedly connected to a third cutting fluid pump (17). The front of the liquid supply tank (1) is fixedly connected to a PLC programmable controller (2).

2. The cutting fluid centralized supply and return device according to claim 1, characterized in that: The input end of the first cutting fluid pump (5) extends into the interior of the supply tank (1), and the end of the supply pipe (6) away from the first cutting fluid pump (5) extends into the interior of the distribution box (13). The output end of the second cutting fluid pump (19) extends into the interior of the supply tank (1). The outer surface of each coarse filter screen (30) and the outer surface of each fine filter screen (31) are engaged with the interior of the semi-circular slot (32). Each second turbidity sensor (27) is located above the filter cylinder (28), and each third flow control valve (25) is located below the filter cylinder (28). The end of the first return pipe (14) away from the first filter pipe (15) and the second... The ends of the two return pipes (24) away from the second filter pipe (29) are fixedly connected to the outer surface of the return main pipe (20). The first return pipe (14) and the second return pipe (24) are both located in the middle of the first turbidity sensor (23) and the first filter pipe (15). The PLC programmable controller (2) is electrically connected to the first cutting fluid pump (5), the first flow control valve (7), the second flow control valve (8), the second cutting fluid pump (19), the flow sensor (21), the pressure sensor (22), the first turbidity sensor (23), the second turbidity sensor (27), the third flow control valve (25), and the third cutting fluid pump (17) through wires.

3. The cutting fluid centralized supply and return device according to claim 1, characterized in that: The bottom surface of the liquid supply tank (1) is fixedly connected to a base (12), and the upper surface of the base (12) is in contact with the outer surface of the five return pipes (10) and the outer surface of the return main pipe (20).

4. A centralized cutting fluid supply and return device according to claim 3, characterized in that: A support base (11) is fixedly connected to the outer right side of the diversion box (13), and the bottom surface of the support base (11) is fixedly connected to the upper surface of the base (12).

5. A centralized cutting fluid supply and return device according to claim 1, characterized in that: A scale plate (4) is provided on the outside of the liquid supply tank (1), and the outer surface of the scale plate (4) is fixedly connected to the inner wall of the front of the liquid supply tank (1).

6. The cutting fluid centralized supply and return device according to claim 1, characterized in that: The upper surface of the liquid supply tank (1) is fixedly connected to an injection pipe (18), and the lower back of the liquid supply tank (1) is fixedly connected to a discharge pipe (3).

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