Backwashing multi-stage composite constant-temperature filter and filtering method

Abstract

The filter comprises trundles, the trundles are symmetrically arranged on a main water tank, a washing support is fixedly connected to the main water tank, a washing motor is fixedly connected to the washing support, the output end of the washing motor is fixedly connected to a washing water pump, and the output end of the washing motor is fixedly connected to the washing water pump. The flushing water pump is fixedly connected to the flushing bracket; according to the invention, after primary filtration by the magnet filter, large-particle impurities are secondarily filtered by the water tank filter screen, and third-stage fine filtration is carried out by the filter element, so that the purity of the cutting fluid is improved, and the temperature can be constant in a set temperature range under the action of the coil immersion type water cooling machine; the water cooling machine coil pipe can make the grinding liquid reach the set temperature more quickly, the filtering precision is high, and constant-temperature control over the grinding liquid can be achieved; the smudginess condition of the filter element is automatically monitored through the pressure gauge, and the filter element can be automatically and efficiently cleaned, so that the operation stability of the equipment is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of filters, and in particular to a backwashing multi-stage composite constant temperature filter and a filtering method. Background Art

[0002] Grinding liquid is an industrial liquid, which is mainly used for grinding workpieces to improve the surface finish and reduce the surface roughness of the workpieces. The grinding liquid tank is a container for storing and circulating grinding liquid in the grinding equipment. The grinding liquid tank will be used to filter and purify the recovered grinding liquid for the next use. However, the existing grinding liquid tank still has shortcomings. First of all, for parts with very high processing precision requirements, such as part diameter tolerance of 1 micron, roundness of 1 micron, surface roughness Ra0.1, under such high precision requirements, the conventionally configured grinding liquid tank only has a natural sedimentation or filtration function, no constant temperature function, no high-precision filtration, such a grinding liquid tank will be difficult to meet the processing precision; secondly, the existing grinding liquid tank cannot monitor the dirtiness of the internal filtering function components, and it is difficult to automatically and efficiently clean them, affecting the operating stability of the equipment; therefore, it is necessary to design a backwashing multi-stage composite constant temperature filter. Summary of the invention

[0003] The purpose of the present invention is to provide a backwashing multi-stage composite constant temperature filter and a filtering method to solve the problem that the existing grinding liquid water tank has very high requirements for parts with very high processing precision, such as part diameter tolerance of 1 micron, roundness of 1 micron, surface roughness Ra0.1. Under such high precision requirements, the conventionally configured grinding liquid water tank has only a natural sedimentation function, no constant temperature function, and no high-precision filtration. Such a grinding liquid water tank will be difficult to meet the processing precision, and it will be impossible to monitor the dirtiness of the internal filtering function components, and it is also difficult to automatically and efficiently clean them, affecting the operating stability of the equipment.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a backwashing multi-stage composite constant temperature filter, comprising casters, the casters are symmetrically arranged on a main water tank, a flushing bracket is fixedly connected to the main water tank, a flushing motor is fixedly connected to the flushing bracket, the output end of the flushing motor is fixedly connected to a flushing water pump, the flushing water pump is fixedly connected to the flushing bracket, a flushing / pumping water inlet pipe is fixedly connected to the flushing / pumping water inlet pipe, a sewage suction pipe is fixedly connected to the sewage suction pipe, a sewage suction end angle seat valve is fixedly connected to the flushing / pumping A clean water suction pipe is fixedly connected to the water inlet pipe, a clean water suction end angle seat valve is fixedly connected to the clean water suction pipe, a flushing / pumping outlet pipe is fixedly connected to the flushing water pump, the flushing water pump is fixedly connected to the main water tank, the main water tank is fixedly connected to the water tank clean water sink, the water tank clean water sink is fixedly connected with a clean water outlet pump, the water tank clean water sink is fixedly connected with a water tank handle, an electric control mounting bracket is fixedly connected to one side of the water tank clean water sink, the electric control mounting bracket is fixedly connected with an electric control box, the electric control box is fixedly connected with a pressure controller, and the electric control box is fixedly connected with an air source processing component.

[0005] As a further technical solution of the present invention, the water tank clean water tank is fixedly connected with a coil immersed water cooler, the coil immersed water cooler is fixedly connected with a water cooler coil, the water tank clean water tank is fixedly connected with a filter barrel, the filter barrel is fixedly connected with a filter overflow pipe, the filter overflow pipe is fixedly connected with a flushing / overflow conversion joint, the flushing / overflow conversion joint is fixedly connected with an overflow angle seat valve, the flushing / overflow conversion joint is fixedly connected with a backwashing angle seat valve, the backwashing angle seat valve is fixedly connected to the filter overflow pipe, the backwashing angle seat valve is fixedly connected with a backwashing air intake pipe, the backwashing angle seat valve is fixedly connected with one end of the backwashing main pipe, the other end of the backwashing main pipe is fixedly connected to the sewage main water pipe backwashing / filter adapter, the sewage main water pipe backwashing / filter adapter is fixedly connected to the sewage main pipe, and one end of the sewage main pipe is fixedly connected to the flushing / pumping outlet pipe.

[0006] As a further technical solution of the present invention, the other end of the sewage main pipe is fixedly connected to a sewage main water pipe filter inlet pipeline, a sewage main water pipe filter inlet pipeline is fixedly connected to a sewage main water pipe angle seat valve, the sewage main water pipe filter inlet pipeline is fixedly connected to a filter barrel, and a pressure gauge is fixedly connected to the filter barrel.

[0007] As a further technical solution of the present invention, the filter barrel is fixedly connected to a filtration and sewage discharge main water pipe, a backwash sewage discharge angle seat valve is fixedly connected to the filtration and sewage discharge main water pipe, a flushing sewage discharge angle valve is fixedly connected to the filtration and sewage discharge main water pipe, and a flushing sewage discharge port is fixedly connected to the flushing sewage discharge angle valve.

[0008] As a further technical solution of the present invention, a float switch is arranged in the water tank cleaning tank, a sewage sedimentation water tank is closely attached to one side of the water tank cleaning tank, a sewage water tank overflow pipe is fixedly connected to the sewage sedimentation water tank, a cleaning water tank overflow port is opened on the water tank cleaning tank, a water tank filter is fixedly connected to the water tank cleaning tank, the water tank filter is fixedly connected to the main water tank, a magnet filter is fixedly connected to the main water tank, and a sewage main water pipe interface is fixedly connected to the magnet filter.

[0009] As a further technical solution of the present invention, a filter barrel cover is fixedly connected to the filter barrel, a filter element locking nut is fixedly connected to the filter barrel cover, a filter element locking nut is fixedly connected to a filter element fixing plate, and the filter element fixing plate is tightly attached to the filter barrel cover.

[0010] As a further technical solution of the present invention, a filter element is fixedly connected to the filter element fixing plate, the filter element is fixedly connected to the filter barrel bottom shell, and the filter barrel bottom shell is fixedly connected to the filter barrel bracket.

[0011] The backwashing multi-stage composite constant temperature filter provided by the present invention has the advantages that: by starting the magnet filter, the machine drainage pipe is connected to the sewage main water pipe interface on the magnet filter, the grinding liquid filtered by the first stage of the magnet filter flows to the water tank filter net for second-stage filtration, and the grinding liquid flows to the sewage tank of the main water tank. At the same time, the corresponding button on the electric control box for controlling the start of the flushing motor is pressed, and the flushing motor starts to drive the flushing water pump to work. The flushing water pump pumps the grinding liquid that has passed the secondary filtration to the sewage main pipe through the sewage suction pipe, and the grinding liquid flows to the angle seat valve of the sewage main water pipeline into the filter barrel, and is filtered through the filter element for the third stage. The grinding liquid is purified to a state that can meet the use, and the grinding liquid comes to the water tank through the filter overflow pipe. Clean water tank, the grinding liquid that has been filtered through three stages in the water tank clean water tank can maintain a constant temperature within the set temperature range under the action of the coil immersed water chiller. The water chiller coil can make the grinding liquid reach the set temperature faster. The constant temperature grinding liquid is injected into the processing position through the clean water outlet pump. The qualified grinding liquid is filtered with an accuracy of 5 microns, and this process repeats. When the depth of the grinding liquid in the clean water tank exceeds the setting range of the float switch, the flushing water pump will be controlled to stop working, and the overflowing water will flow into the sewage tank of the main water tank through the overflow port of the clean water tank. When the water level of the clean water tank drops, the flushing water pump will work again and repeat the above process. After the first-level filtration of the magnet filter, the large particles of impurities are filtered by the water tank filter net at the second level, and then filtered. The core is used for the third-level filtration and fine filtration to improve the purity of the cutting fluid. Through the effect of the coil immersed water cooler, the temperature can be kept constant in the set temperature range. The water cooler coil can make the grinding fluid reach the set temperature faster, with high filtration accuracy and constant temperature control of the grinding fluid. When the filter element in the filter barrel filters too many impurities, it will cause the pressure in the filter barrel to be too high, which can be checked from the pressure gauge, and the pressure alarm will also work to remind you that the filter element needs to be backwashed and cleaned. The filter element is backwashed and cleaned with pneumatic and water media. When the alarm is received, the angle seat valve at the sewage suction end will be closed, the angle seat valve of the sewage main water pipeline will be closed, and the angle seat valve at the clean water suction end will be started. Clean water will be introduced from the clean water suction pipe and will be pumped into the clean water through the flushing water pump. Clean water is led to the top of the filter barrel through the sewage main pipe and the backwash main pipe, and reaches the inside of the filter barrel through the water inlet hole on the filter barrel cover. In this process, compressed air will be used to enter the air source treatment component for processing, and then filled into the filter barrel through the backwash air inlet pipe. Clean water is used under pressure to clean the filter element. Sewage and particulate impurities are discharged from the filter sewage main water pipe on the bottom shell of the filter barrel to the sewage sedimentation tank. After sedimentation in the sewage sedimentation tank, clean water is led back to the main water tank through the sewage tank overflow pipe. After cleaning, repeat the above steps, the backwash multi-stage composite constant temperature filter can be used normally, can automatically monitor the dirtiness of the filter element, and can automatically and efficiently clean the filter element, ensuring the operating stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the position of the pressure gauge in the present invention; Figure 3 It is a schematic diagram of the position of the water cooling machine coil in the present invention; Figure 4 It is a schematic diagram of the position of the locking nut of the filter element in the present invention; Figure 5 It is a schematic diagram of the position of the filter barrel bracket in the present invention.

[0014] In the figure: 1. Casters; 2. Main water tank; 3. Sewage main water pipe backwash / filter adapter; 4. Flushing motor; 5. Flushing bracket; 6. Flushing water pump; 7. Flushing / pumping water inlet pipe; 8. Flushing / pumping water outlet pipe; 9. Clean water outlet pump; 10. Pressure controller; 11. Electric control box; 12. Coil immersed water chiller; 13. Backwash angle seat valve; 14. Flushing / overflow adapter; 15. Overflow angle seat valve; 16. Pressure gauge; 17. Backwash sewage angle seat valve; 18. Flushing sewage angle valve; 19. Flushing sewage port; 20. Sewage sedimentation tank; 21. Sewage tank overflow pipe; 22. Water tank filter; 23. Magnet filter; 24. Backwash air intake pipe; 25. Angle seat valve for sewage main water pipe; 26. Water tank and water purification tank; 27. Filter inlet pipeline for sewage main water pipe; 28. Interface for sewage main water pipe; 29. ​​Overflow port of water purification tank; 30. Sewage main pipe; 31. Backwash main pipe; 32. Angle seat valve for sewage suction end; 33. Sewage suction pipe; 34. Water purification suction pipe; 35. Angle seat valve for water purification suction end; 36. Water tank handle; 37. Filter barrel; 38. Filter and sewage main water pipe; 39. Filter overflow pipe; 40. Water cooling machine coil; 41. Float switch; 42. Electronic control mounting bracket; 43. Air source treatment unit; 44. Filter element locking nut; 45. Filter element fixing plate; 46. Filter element; 47. Filter barrel cover; 48. Filter barrel bottom shell; 49. Filter barrel bracket. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] Please see attached Figure 1 -Attached Figure 5, an embodiment provided by the present invention: a backwashing multi-stage composite constant temperature filter, comprising a caster 1, the caster 1 is symmetrically arranged on a main water tank 2, a flushing bracket 5 is fixedly connected to the main water tank 2, a flushing motor 4 is fixedly connected to the flushing bracket 5, an output end of the flushing motor 4 is fixedly connected to a flushing water pump 6, the flushing water pump 6 is fixedly connected to the flushing bracket 5, a flushing / pumping water inlet pipe 7 is fixedly connected to the flushing / pumping water inlet pipe 7, a sewage suction pipe 33 is fixedly connected to the sewage suction pipe 33, a sewage suction end angle seat valve 32 is fixedly connected to the sewage suction pipe 33, a clean water suction pipe 34 is fixedly connected to the flushing / pumping water inlet pipe 7, a clean water suction pipe 34 is fixedly connected to the clean water suction pipe 34, a clean water suction end angle seat valve 35 is fixedly connected to the flushing water pump 6 / Water pumping outlet pipe 8, flushing water pump 6 is fixedly connected to the main water tank 2, the main water tank 2 is fixedly connected to the water tank clean water tank 26, the water tank clean water tank 26 is fixedly connected with a clean water outlet pump 9, the water tank clean water tank 26 is fixedly connected with a water tank handle 36, one side of the water tank clean water tank 26 is fixedly connected with an electric control mounting bracket 42, the electric control mounting bracket 42 is fixedly connected with an electric control box 11, the electric control box 11 is fixedly connected with a pressure controller 10, the electric control box 11 is fixedly connected with an air source processing component 43, the water tank clean water tank 26 is fixedly connected with a coil immersed water cooler 12, the coil immersed water cooler 12 is fixedly connected with a water cooler coil 40, the water tank clean water tank 26 is fixedly connected with a filter barrel 37, the filter barrel 37 is fixedly connected with a filter overflow The filter overflow pipe 39 is fixedly connected with a flushing / overflow conversion joint 14, the flushing / overflow conversion joint 14 is fixedly connected with an overflow angle seat valve 15, the flushing / overflow conversion joint 14 is fixedly connected with a backwashing angle seat valve 13, the backwashing angle seat valve 13 is fixedly connected to the filter overflow pipe 39, the backwashing angle seat valve 13 is fixedly connected with a backwashing air intake pipe 24, the backwashing angle seat valve 13 is fixedly connected with one end of the backwashing main pipe 31, the other end of the backwashing main pipe 31 is fixedly connected to the sewage main water pipe backwashing / filter adapter 3, the sewage main water pipe backwashing / filter adapter 3 is fixedly connected to the sewage main pipe 30, one end of the sewage main pipe 30 is fixedly connected to the flushing / pumping outlet pipe 8, and the other end of the sewage main pipe 30 is fixedly connected to the backwashing / filter adapter 3. A sewage main water pipe filter inlet pipe 27 is connected to the sewage main water pipe filter inlet pipe 27, and a sewage main water pipe angle seat valve 25 is fixedly connected to the sewage main water pipe filter inlet pipe 27. The sewage main water pipe filter inlet pipe 27 is fixedly connected to the filter barrel 37, and a pressure gauge 16 is fixedly connected to the filter barrel 37. A filter sewage main water pipe 38 is fixedly connected to the filter barrel 37, and a backwash sewage angle seat valve 17 is fixedly connected to the filter sewage main water pipe 38. A flushing sewage angle valve 18 is fixedly connected to the filtering sewage main water pipe 38, and a flushing sewage angle valve 18 is fixedly connected to the flushing sewage angle valve 18. A float switch 41 is provided in the water tank clean water tank 26, and a sewage sedimentation water tank 20 is closely attached to one side of the water tank clean water tank 26, and a sewage tank overflow pipe 21 is fixedly connected to the sewage sedimentation water tank 20.A clean water tank overflow port 29 is provided on the clean water tank 26 of the water tank, a water tank filter net 22 is fixedly connected to the water tank clean water tank 26, the water tank filter net 22 is fixedly connected to the main water tank 2, a magnet filter 23 is fixedly connected to the main water tank 2, a sewage main water pipe interface 28 is fixedly connected to the magnet filter 23, a filter barrel cover 47 is fixedly connected to the filter barrel cover 47, a filter element locking nut 44 is fixedly connected to the filter element locking nut 44, a filter element fixing plate 45 is fixedly connected to the filter element fixing plate 45, the filter element fixing plate 45 is tightly attached to the filter barrel cover 47, a filter element 46 is fixedly connected to the filter element fixing plate 45, the filter element 46 is fixedly connected to the filter barrel bottom shell 48, the filter element 46 is used to filter the grinding liquid, the filter barrel bottom shell 48 is fixedly connected to the filter barrel bracket 49, and the filter barrel bracket 49 is used to provide support for the filter barrel bottom shell 48; The above-mentioned filtering method of a backwashing multi-stage composite constant temperature filter includes the following steps: first, the magnet filter 23 is started, the machine drainage pipe is connected to the sewage main water pipe interface 28 on the magnet filter 23, the grinding liquid filtered by the magnet filter 23 flows to the water tank filter 22 for the second stage of filtration, and the grinding liquid flows to the sewage tank of the main water tank 2, and at the same time, the corresponding button on the electric control box 11 for controlling the start of the flushing motor 4 is pressed, and the flushing motor 4 is started to drive the flushing water pump 6 to work, and the flushing water pump 6 will pass through the secondary filter The filtered grinding liquid is pumped to the sewage main pipe 30 through the sewage suction pipe 33, and the grinding liquid flows to the angle seat valve 25 of the sewage main water pipe and enters the filter barrel 37. It is filtered for the third level through the filter element 46, and the grinding liquid is purified to a state that meets the use requirements. The grinding liquid passes through the filter overflow pipe 39 to the water tank clean water tank 26. The temperature of the grinding liquid that has been filtered for the third level in the water tank clean water tank 26 can be kept constant within the set temperature range under the action of the coil immersed water chiller 12. The water chiller coil 40 can make the grinding liquid reach the set temperature faster, and constant temperature grinding The liquid is injected into the processing position through the clean water outlet pump 9, and the qualified grinding liquid is filtered with an accuracy of 5 microns, and this process is repeated; when the depth of the grinding liquid in the clean water tank 26 of the water tank exceeds the setting range of the float switch 41, the flushing water pump 6 will be controlled to stop working, and the overflowing water will flow into the sewage tank of the main water tank 2 through the overflow port 29 of the clean water tank. When the water level of the clean water tank 26 of the water tank drops, the flushing water pump 6 will work again and repeat the above process; after the first-level filtration of the magnet filter 23, the large particles of impurities will be filtered by the water tank filter 22 at the second level , and then the filter element 46 performs the third-level filtration and fine filtration to improve the purity of the cutting fluid. Through the action of the coil immersed water chiller 12, the temperature can be kept constant within the set temperature range. The water chiller coil 40 can make the grinding fluid reach the set temperature faster, with high filtration accuracy and can achieve constant temperature control of the grinding fluid. When the filter element 46 in the filter barrel 37 filters too many impurities, it will cause the pressure in the filter barrel 37 to be too high, which can be checked from the pressure gauge 16, and the pressure alarm will also work to remind you that the filter element 46 needs to be backwashed and cleaned.The filter element 46 is backwashed and cleaned with pneumatic and water media. When an alarm is received, the angle seat valve 32 at the sewage suction end is closed, the angle seat valve 25 of the sewage main water pipeline is closed, and the angle seat valve 35 at the clean water suction end is started. Clean water will be introduced from the clean water suction pipe 34, and the clean water will be introduced to the top of the filter barrel 37 through the sewage main pipe 30 and the backwashing main pipe 31 via the flushing water pump 6, and then come into the filter barrel 37 through the water inlet hole on the filter barrel cover 47. In this process, compressed air will be used to enter the air source treatment component 43 for treatment, and the backwashing air intake pipe 24 will be used to clean the clean water. Fill the filter barrel 37, pressurize and use clean water to clean the filter element 46, and the sewage and particulate impurities are discharged from the main water pipe 38 for filtering and draining on the bottom shell 48 of the filter barrel to the sewage sedimentation tank 20. After sedimentation in the sewage sedimentation tank 20, the clean water is led back to the main water tank 2 through the overflow pipe 21 of the sewage tank. After cleaning, repeat the above steps, the backwashing multi-stage composite constant temperature filter can be used normally, and the dirtiness of the filter element 46 can be automatically monitored, and the filter element 46 can be automatically and efficiently cleaned, ensuring the operation stability of the equipment. ;

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A backwashing multi-stage composite constant temperature filter, comprising a caster (1), characterized in that: The casters (1) are symmetrically arranged on the main water tank (2); a flushing bracket (5) is fixedly connected to the main water tank (2); a flushing motor (4) is fixedly connected to the flushing bracket (5); an output end of the flushing motor (4) is fixedly connected to a flushing water pump (6); the flushing water pump (6) is fixedly connected to the flushing bracket (5); a flushing / pumping water inlet pipe (7) is fixedly connected to the flushing / pumping water inlet pipe (7); a sewage suction pipe (33) is fixedly connected to the sewage suction pipe (33); a sewage suction end angle seat valve (32) is fixedly connected to the flushing / pumping water inlet pipe (7); a clean water suction pipe (34) is fixedly connected to the clean water suction pipe (34); A clean water suction end angle seat valve (35) is provided, a flushing / pumping water outlet pipe (8) is fixedly connected to the flushing water pump (6), the flushing water pump (6) is fixedly connected to the main water tank (2), the main water tank (2) is fixedly connected to the water tank clean water tank (26), a clean water outlet pump (9) is fixedly connected to the water tank clean water tank (26), a water tank handle (36) is fixedly connected to the water tank clean water tank (26), an electric control mounting bracket (42) is fixedly connected to one side of the water tank clean water tank (26), an electric control box (11) is fixedly connected to the electric control mounting bracket (42), a pressure controller (10) is fixedly connected to the electric control box (11), and an air source processing component (43) is fixedly connected to the electric control box (11).

2. A backwashing multi-stage composite constant temperature filter according to claim 1, characterized in that: The water tank clean water tank (26) is fixedly connected to a coil immersed water cooling machine (12), the coil immersed water cooling machine (12) is fixedly connected to a water cooling machine coil (40), the water tank clean water tank (26) is fixedly connected to a filter barrel (37), the filter barrel (37) is fixedly connected to a filter overflow pipe (39), the filter overflow pipe (39) is fixedly connected to a flushing / overflow conversion joint (14), the flushing / overflow conversion joint (14) is fixedly connected to an overflow angle seat valve (15), and the flushing / overflow conversion joint (14) is fixedly connected to a backwashing angle seat valve (13), the backwash angle seat valve (13) is fixedly connected to the filter overflow pipe (39), the backwash angle seat valve (13) is fixedly connected to the backwash air inlet pipe (24), the backwash angle seat valve (13) is fixedly connected to one end of the backwash main pipe (31), the other end of the backwash main pipe (31) is fixedly connected to the sewage main water pipe backwash / filtration adapter (3), the sewage main water pipe backwash / filtration adapter (3) is fixedly connected to the sewage main pipe (30), and one end of the sewage main pipe (30) is fixedly connected to the flushing / pumping outlet pipe (8).

3. A backwashing multi-stage composite constant temperature filter according to claim 2, characterized in that: The other end of the sewage main pipe (30) is fixedly connected to a sewage main water pipe filter inlet pipe (27), to which a sewage main water pipe angle seat valve (25) is fixedly connected, and the sewage main water pipe filter inlet pipe (27) is fixedly connected to a filter barrel (37), to which a pressure gauge (16) is fixedly connected.

4. A backwashing multi-stage composite constant temperature filter according to claim 3, characterized in that: The filter barrel (37) is fixedly connected to a filter sewage discharge main water pipe (38), a backwash sewage discharge angle seat valve (17) is fixedly connected to the filter sewage discharge main water pipe (38), a flush sewage discharge angle valve (18) is fixedly connected to the filter sewage discharge main water pipe (38), and a flush sewage discharge port (19) is fixedly connected to the flush sewage discharge angle valve (18).

5. The backwashing multi-stage composite constant temperature filter according to claim 1, characterized in that: A float switch (41) is provided in the water tank cleaning tank (26); a sewage settling tank (20) is closely attached to one side of the water tank cleaning tank (26); a sewage tank overflow pipe (21) is fixedly connected to the sewage settling tank (20); a cleaning tank overflow port (29) is provided on the water tank cleaning tank (26); a water tank filter (22) is fixedly connected to the water tank cleaning tank (26); the water tank filter (22) is fixedly connected to the main water tank (2); a magnet filter (23) is fixedly connected to the main water tank (2); and a sewage main water pipe interface (28) is fixedly connected to the magnet filter (23).

6. A backwashing multi-stage composite constant temperature filter according to claim 3, characterized in that: The filter barrel (37) is fixedly connected to a filter barrel cover (47), a filter element locking nut (44) is fixedly connected to the filter barrel cover (47), the filter element locking nut (44) is fixedly connected to a filter element fixing plate (45), and the filter element fixing plate (45) is tightly attached to the filter barrel cover (47).

7. A backwashing multi-stage composite constant temperature filter according to claim 6, characterized in that: A filter element (46) is fixedly connected to the filter element fixing plate (45), the filter element (46) is fixedly connected to the filter barrel bottom shell (48), and the filter barrel bottom shell (48) is fixedly connected to the filter barrel bracket (49).

8. A filtering method for backwashing a multi-stage composite constant temperature filter according to any one of claims 1 to 7, characterized in that: The following steps are involved: First, the magnet filter (23) is started, and the machine drainage pipe is connected to the sewage main water pipe interface (28) on the magnet filter (23). The grinding liquid that has passed the first-stage filtration of the magnet filter (23) flows to the water tank filter (22) for the second-stage filtration, and then flows to the sewage tank of the main water tank (2). At the same time, the corresponding button on the electric control box (11) for controlling the start of the flushing motor (4) is pressed, and the flushing motor (4) is started to drive the flushing water pump (6) to work. The flushing water pump (6) pumps the grinding liquid that has passed the second-stage filtration to the sewage main pipe (30) through the sewage suction pipe (33), and the grinding liquid flows to the sewage main water tank (2). The pipeline angle seat valve (25) enters the filter barrel (37), and is filtered through the filter element (46) for the third stage. The grinding liquid is purified to a state that meets the requirements of use. The grinding liquid comes to the water tank clean water tank (26) through the filter overflow pipe (39). The temperature of the grinding liquid that has been filtered through the third stage in the water tank clean water tank (26) can be kept constant within the set temperature range under the action of the coil immersed water cooling machine (12). The water cooling machine coil (40) can make the grinding liquid reach the set temperature faster. The constant temperature grinding liquid is injected into the processing position through the clean water outlet pump (9). The accuracy of the filtered qualified grinding liquid is 5 microns, and this process is repeated; When the depth of the grinding liquid in the clean water tank (26) of the water tank exceeds the setting range of the float switch (41), the flushing water pump (6) is controlled to stop working, and the overflowing water flows into the sewage tank of the main water tank (2) through the overflow port (29) of the clean water tank. When the water level in the clean water tank (26) of the water tank drops, the flushing water pump (6) is restarted and the above process is repeated; After the first-stage filtration by the magnet filter (23), the large particles of impurities are filtered by the water tank filter (22) for the second stage, and then the filter element (46) performs the third stage of fine filtration to improve the purity of the cutting fluid. Through the action of the coil immersed water cooling machine (12), the temperature can be kept constant within the set temperature range. The water cooling machine coil (40) can make the grinding fluid reach the set temperature more quickly. When the impurities filtered by the filter element (46) in the filter barrel (37) are too much, the pressure in the filter barrel (37) will be too high, which can be checked from the pressure gauge (16). The pressure alarm works to remind the need to backwash and clean the filter element (46); The filter element (46) is backwashed and cleaned by using pneumatic and water media. When an alarm is received, the angle seat valve (32) at the sewage suction end is closed, the angle seat valve (25) at the sewage main water pipeline is closed, and the angle seat valve (35) at the clean water suction end is started. Clean water is introduced from the clean water suction pipe (34), and the clean water is led to the top of the filter barrel (37) through the sewage main pipe (30) and the backwashing main pipe (31) by the flushing water pump (6), and then reaches the filter barrel (37) through the water inlet hole on the filter barrel cover (47). ) inside, during this process, compressed air is used to enter the air source treatment component (43) for treatment, and is filled into the filter barrel (37) through the backwash air intake pipe (24). Clean water is used under pressure to clean the filter element (46), and the sewage and particulate impurities are discharged from the main filter and sewage pipe (38) on the bottom shell (48) of the filter barrel to the sewage sedimentation tank (20). After sedimentation in the sewage sedimentation tank (20), the clean water is led back to the main water tank (2) through the sewage tank overflow pipe (21), and the cleaning is completed.

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