Multi-stage reflux precipitation type circulating filtration device

Abstract

The utility model relates to the technical field of filtering and recycling of cutting fluid, in particular to a multi-stage backflow precipitation type circulating filtering device which comprises a liquid storage container and a filtering cover, the liquid storage container is provided with a feeding port and a discharging port which are respectively communicated with a liquid storage space formed in the liquid storage container, and the filtering cover is arranged in the liquid storage container. The filter cover is mounted in the internal liquid storage space of the liquid storage container, and the cutting liquid enters the liquid storage container from the feeding opening, is filtered by the filter cover and is discharged from the discharging opening; the relative height of the inlet in the liquid storage container is lower than the relative height of the outlet, so that the cutting liquid penetrates through the filter cover from bottom to top, and the filtering operation is completed. In conclusion, the extensible small liquid storage pipe is arranged to form a multi-stage precipitating and filtering circulation structure, so that the cutting liquid can be precipitated and filtered for multiple times, the standard of repeated use is achieved, the use of consumables can be reduced, the energy consumption can be reduced, and the energy can be saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of cutting fluid's filtration and recycling, especially to a multistage backflow sedimentation type circulating filter device. BACKGROUND

[0002] Cutting fluid (cutting fluid, coolant) is a kind of industrial liquid used in metal cutting, polishing process, used to cool and lubricate tool and workpiece, cutting fluid is made of a variety of super strong functional additives by scientific compound, and it has good cooling performance, lubricating performance, antirust performance, oil removal cleaning function, anticorrosion function, easy dilution characteristics.

[0003] In the production process, in order to reduce the use cost of cutting fluid, cutting fluid is recycled, that is, after spraying on tool and workpiece, it is stored for next time spraying, but because tool is processed on workpiece, a large amount of debris is generated, so a large amount of impurities is left in recycled cutting fluid, in order to avoid the blockage of cutting fluid conveying pipeline, the existing recovery device is provided with a filter structure in the pipeline.

[0004] The Chinese patent document with publication number CN104587723A discloses a cutting fluid negative pressure type paper belt filter device, which comprises a filter box body, a filter belt transmission mechanism is installed in the filter box body, a vacuum chamber is arranged at the lower part of the filter box body, a square groove is arranged at the upper part of the filter box body, a filter paper is installed in the square groove, a dirty liquid inlet is installed in the filter belt transmission mechanism, the front end of the filter belt transmission mechanism is connected with a transmission device, and the transmission device is connected with a dirty paper box through a connecting pipe.

[0005] Therefore, it is necessary to develop a multistage backflow sedimentation type circulating filter device, which can reduce the use of consumables, reduce energy consumption and save energy during the filtering process of cutting fluid. UTILITY MODEL CONTENT

[0006] The utility model is aimed at providing a technical scheme for solving the above problems.

[0007] The utility model provides a kind of multistage backflow sedimentation type circulating filter device, including liquid storage container and filter cover, the liquid storage container is equipped with inlet and outlet, and respectively with the liquid storage space formed in its inside form intercommunication state, the filter cover is installed in the internal liquid storage space of liquid storage container, and make cutting fluid from inlet into liquid storage container, after being filtered by filter cover, discharge from outlet;The relative height of inlet is lower than the relative height of outlet in the liquid storage container, to make cutting fluid from below to above pass through filter cover, complete filtering operation.

[0008] As a further scheme of the utility model: the filter cover is equipped with filter assembly, and the filter assembly is used for filtering operation on impurities in cutting fluid.

[0009] As a further scheme of the utility model: the filter cover is equipped with adsorption assembly, and the adsorption assembly is used for magnetic adsorption operation on magnetizable material in cutting fluid.

[0010] As a further scheme of the utility model: the filter cover is equipped with filter assembly and adsorption assembly fixed to each other, the filter assembly is equipped with basket, and filter material is placed in the inside of the basket, to be used for filtering operation on cutting fluid;The adsorption assembly is equipped with hollow pipe, and one end of the hollow pipe extends upward to form open end, and the other end is fixed to the basket and is equipped with closed structure to form closed end;Magnetic piece and pull rod are arranged in the inside of the hollow pipe, one end of the pull rod is fixed to the magnetic piece, and the magnetic piece penetrates into the closed end of the hollow pipe, and the other end of the pull rod extends out of the hollow pipe to form hand holding end.

[0011] As a further scheme of the utility model: the filter cover is further equipped with auxiliary spring and auxiliary net, one end of the auxiliary spring is fixed to the open end of the upper part of the hollow pipe, and the other end is fixed to the outer peripheral side wall of the basket, and forms spiral support structure around the hollow pipe, and the auxiliary net is sleeved on the support structure formed by the auxiliary spring, and one end thereof is fixed to the outer peripheral side wall of the basket, and the other end is fixed to the open end of the upper part of the hollow pipe.

[0012] As a further scheme of the utility model: the filter cover is further equipped with sealing ring, and the inner side wall of the sealing ring is fixed to the outer peripheral side wall of the basket, and the outer side wall abuts against the inner side wall of the filter container, to prevent cutting fluid from flowing through the gap between the filter container and the basket.

[0013] As a further scheme of the utility model: the bottom of the liquid storage container is further equipped with blowdown, and the blowdown forms intercommunication state with the liquid storage space inside the liquid storage container, to discharge impurities precipitated in the inside of the liquid storage container.

[0014] As a further scheme of the utility model: the bottom of the liquid storage container is further provided with a dirt suction pipe, one end of the dirt suction pipe is communicated with the dirt outlet, and the other end of the dirt suction pipe is formed with a dirt suction opening for placing a dirt suction device to suck the impurities deposited in the liquid storage container.

[0015] As a further scheme of the utility model: the liquid storage container is provided with a first liquid storage pipe and a second liquid storage pipe, the first liquid storage pipe and the second liquid storage pipe are respectively provided with a filter cover, the first liquid storage pipe is provided with a first inlet and a first outlet, the relative height of the first inlet in the first liquid storage pipe is lower than the relative height of the first outlet, the second liquid storage pipe is provided with a second inlet and a second outlet, the relative height of the second inlet in the second liquid storage pipe is lower than the relative height of the second outlet, the first inlet is used for placing used cutting fluid, the first outlet is in communication with the second inlet, and the second outlet is used for discharging filtered cutting fluid.

[0016] As a further scheme of the utility model: the liquid storage container is further provided with a third liquid storage pipe, the third liquid storage pipe is provided with a filter cover, the third liquid storage pipe is provided with a third inlet and a third outlet, the relative height of the third inlet in the third liquid storage pipe is lower than the relative height of the third outlet, the second outlet is in communication with the third inlet, and the third outlet is used for discharging filtered cutting fluid.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] 1. By arranging the liquid storage container with the inlet lower than the outlet, the cutting fluid can pass through the filter cover from bottom to top, so that the cutting fluid can be subjected to sedimentation treatment and filtration treatment, and can be recycled.

[0019] 2. Two treatment devices are arranged in the filter cover, one of which is used for filtering or adsorbing the impurities by using activated carbon, and the other of which is used for adsorbing the iron filings in the cutting fluid by using a magnetic steel pipe, so as to reduce the probability of the activated carbon being blocked by the iron filings.

[0020] 3. A plurality of liquid storage pipes can be arranged, and the cutting fluid can be subjected to multiple times of sedimentation and filtration by using the plurality of liquid storage pipes and filter covers, so as to improve the purity of the cutting fluid.

[0021] Therefore, through the improvement, the multi-stage reflux sedimentation type circulating filter device can be provided, the small-sized liquid storage pipe which can be expanded is arranged to form a multi-stage sedimentation and filtration circulating structure, the cutting fluid can be subjected to multiple times of sedimentation and filtration, the standard of repeated use is reached, the use of consumables can be reduced, the energy consumption is reduced, and the energy is saved.

[0022] The additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter in the description. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0024] Figure 1 is a structural schematic view of the whole of the present application;

[0025] Figure 2 is a structural schematic view of the first discharge port and the third discharge port of the present application;

[0026] Figure 3 is a structural schematic view of the filter cover and the liquid storage container of the present application being separated;

[0027] Figure 4 is a structural schematic view of the open port and the pollution discharge port of the present application;

[0028] Figure 5 is a structural schematic view of the filter cover of the present application;

[0029] Figure 6 is a structural schematic view of the magnetic member being lifted of the present application.

[0030] The reference signs and names in the drawings are as follows:

[0031] 10 first liquid storage pipe; 11 first discharge port; 12 first discharge port; 20 second liquid storage pipe; 21 second discharge port; 22 second discharge port; 30 third liquid storage pipe; 31 third discharge port; 32 third discharge port; 40 liquid storage container; 41 open port; 42 pollution discharge port; 43 pollution suction pipe; 44 transition pipe; 50 filter cover; 51 sealing ring; 52 auxiliary spring; 53 auxiliary net; 60 filter assembly; 61 basket; 62 filter material; 63 screen; 70 adsorption assembly; 71 hollow pipe; 72 open end; 73 closed end; 74 magnetic member; 75 pull rod; 76 hand holding end. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0033] Please refer to Figures 1 to 6 In the embodiments of the utility model, a multi-stage backflow sedimentation type circulating filter device comprises a liquid storage container 40 and a filter cover 50. The liquid storage container 40 is provided with an inlet and an outlet, and is in communication with the liquid storage space formed in the interior thereof. The filter cover 50 is installed in the interior liquid storage space of the liquid storage container 40, and the cutting fluid enters the liquid storage container 40 from the inlet, is filtered by the filter cover 50, and is discharged from the outlet. The relative height of the inlet of the liquid storage container 40 is lower than that of the outlet, so that the cutting fluid passes through the filter cover 50 from bottom to top, and the filtering operation is completed.

[0034] Specifically, since the metal processing liquid, such as cutting fluid, contains metal particles, iron filings or iron powder and other impurities generated in the processing process after being used, the liquid storage container 40 flowing from bottom to top can be provided, so that the heavier impurities are automatically precipitated downward and accumulated at the bottom, thereby preventing secondary pollution of the cutting fluid. Since the cutting fluid flows slowly, the small filter device can not be provided with a sealed structure, thereby facilitating the inspection or replacement of the filter cover 50. The upper portion of the liquid storage container 40 is provided with an opening 41, and the relative height of the opening 41 of the liquid storage container 40 needs to be higher than that of the outlet, so as to prevent the cutting fluid from overflowing from the opening 41. The filter cover 50 can be placed into the interior of the liquid storage container 40 through the opening 41, and the filter cover 50 is kept in the liquid storage space between the inlet and the outlet, so that the cutting fluid can enter from the inlet, then pass through the filter cover 50 for filtering operation, and then be discharged from the outlet.

[0035] Secondly, in order to prevent the filter cover 50 from falling to the bottom of the liquid storage container 40 and losing the filtering effect, a certain blocking structure can be provided to limit the filter cover 50. For example, the size of the sealing ring 51 around the filter cover 50 can be relatively large, so that a certain pulling force needs to be applied to move the filter cover 50 when it is put in or taken out. Since the cutting fluid flows slowly in the interior of the liquid storage container 40, it will not push the placement position of the filter cover 50. The filter cover 50 can be firmly installed at a specific position of the liquid storage container 40 under the elastic force of the sealing ring 51.

[0036] Furthermore, a limiting step (not shown in the figure) can be provided on the inner side wall of the liquid storage container 40 between the inlet and the filter cover 50 to support the filter cover 50 and prevent it from falling off. Alternatively, a hook (not shown in the figure) or similar structure can be provided at the upper end of the hollow tube 71 of the filter cover 50, so that after the filter cover 50 is installed inside the liquid storage container 40, it can be hung on the side wall of the opening 41 of the liquid storage container 40 using the hook to prevent it from falling off.

[0037] In another embodiment, the filter cover 50 is provided with a filter assembly 60, which is used to filter impurities in the cutting fluid. Specifically, an existing filter assembly 60 can be installed inside the filter cover 50 to filter the cutting fluid. For example, a filter screen 63 with a certain pore size can be used for filtration, or activated carbon can be used for filtration, or filter cotton can be used for filtration.

[0038] In another embodiment, the filter cover 50 is provided with an adsorption component 70, which is used to magnetically adsorb magnetically adsorbable materials in the cutting fluid. Specifically, an existing adsorption component 70 can also be installed inside the filter cover 50 to adsorb and treat the cutting fluid. For example, a magnetic adsorption structure can be used to adsorb iron filings in the cutting fluid.

[0039] In another embodiment, such as Figure 5 and Figure 6 As shown, preferably, the filter cover 50 is provided with a filter assembly 60 and an adsorption assembly 70 fixedly connected to each other. The filter assembly 60 is provided with a basket 61, and the basket 61 contains filter material 62 for filtering cutting fluid. The adsorption assembly 70 is provided with a hollow tube 71, one end of which extends upward to form an open end 72, and the other end is fixedly connected to the basket 61 and has a closed structure to form a closed end 73. The hollow tube 71 is provided with a magnetic component 74 and a pull rod 75 inside. One end of the pull rod 75 is fixedly connected to the magnetic component 74 and the magnetic component 74 passes through the closed end 73 of the hollow tube 71. The other end of the pull rod 75 extends out of the hollow tube 71 for a certain length to form a grip end 76.

[0040] Specifically, the basket 61 has a certain height, thus forming a filtration space with a certain volume. The filter material 62 is placed in the filtration space to filter the flowing cutting fluid. Screens 63 may also be provided at the upper and lower ends of the basket 61 to limit the position of the filter material 62 inside, while not obstructing the passage of the cutting fluid. The filter material 62 is preferably zero-valent iron micro-electrolytic activated carbon particles, as found in existing products, to filter or adsorb impurities in the cutting fluid.

[0041] Secondly, the hollow pipe 71 is preferably made of stainless steel pipe and forms a structure with a closed lower end and an open upper end. The closed structure can be formed by welding a stainless steel cover directly. The magnetic member 74 is preferably made of a magnet with strong magnetism and forms a corresponding magnet column. The pull rod 75 can be made of plastic or metal and has one end fixed to the magnetic member 74 and the other end forming a hand holding end 76, so that the magnetic member 74 can be pulled in the hollow pipe 71.

[0042] Thirdly, when the magnetic member 74 is located at the closed end 73 of the bottom of the hollow pipe 71, its magnetism can be transmitted to the stainless steel pipe, causing the outer wall of the stainless steel pipe to have corresponding magnetism, thereby adsorbing magnetizable substances in the cutting fluid, such as iron filings in the cutting fluid. When adsorption reaches a certain degree or after a period of operation, the magnetic member 74 can be lifted upward by the pull rod 75 to move away from the closed end 73 of the bottom of the hollow pipe 71, thereby weakening the magnetic force at the bottom end of the hollow pipe 71, and then the iron filings adsorbed on the outer wall of the hollow pipe 71 can fall downward, achieving the effect of cleaning most of the iron filings at the lower end of the stainless steel pipe. Subsequently, the magnetic member 74 is reset by being lowered, and the lower end of the hollow pipe 71 restores the magnetic force, and the adsorption of iron filings in the cutting fluid is performed again.

[0043] As shown in Figure 5 and Figure 6 Preferably, the filter cover 50 is also provided with an auxiliary spring 52 and an auxiliary net 53. One end of the auxiliary spring 52 is fixed to the open end 72 of the upper part of the hollow pipe 71, and the other end is fixed to the outer peripheral side wall of the basket 61, forming a spiral support structure around the hollow pipe 71. The auxiliary net 53 is sleeved on the support structure formed by the auxiliary spring 52, with one end fixed to the outer peripheral side wall of the basket 61 and the other end fixed to the open end 72 of the upper part of the hollow pipe 71.

[0044] Specifically, since the diameter of the hollow pipe 71 is smaller than the diameter of the basket 61, the two ends of the auxiliary spring 52 are fixed to the open end 72 of the hollow pipe 71 and the outer peripheral side wall of the basket 61, respectively, forming a spiral winding conical support structure. The auxiliary net 53 is preferably made of 500-mesh nylon net, thereby forming a filter net for strengthening the filtration of impurities in the cutting fluid, without hindering the flow of the cutting fluid.

[0045] Secondly, the cutting fluid flows from bottom to top, first passing through the activated carbon filter space of the basket 61 for filtration, and at the same time being magnetically attracted by the magnetism of the closed end 73 of the stainless steel pipe, then flowing into the inside of the auxiliary net 53, and then being further filtered by the auxiliary net 53, and finally flowing through the auxiliary net 53 to the discharge port.

[0046] AsFigure 5 and Figure 6 As shown in Figs. 8 and 9, preferably, the filter cover 50 is further provided with a sealing ring 51, the inner side wall of the sealing ring 51 is fixed to the outer peripheral side wall of the basket 61, and the outer side wall abuts against the inner side wall of the filter container, so as to prevent the cutting fluid from flowing through the gap between the filter cover 50 and the liquid storage pipe.

[0047] Specifically, in order to prevent the cutting fluid from flowing through the gap between the filter cover 50 and the liquid storage pipe without being filtered, the sealing ring 51 can be arranged on the outer periphery of the filter cover 50, and the sealing ring 51 abuts against the basket 61 of the filter cover 50 and the inner side wall of the liquid storage pipe respectively, so as to form a sealed connection. Meanwhile, the filter cover 50 can be supported.

[0048] As shown in Figs. 8 and 9, Figure 3 and Figure 4 Preferably, the bottom of the liquid storage container 40 is further provided with a sewage outlet 42, which is in communication with the liquid storage space inside the liquid storage container 40, and is used for discharging the impurities deposited inside the liquid storage container 40. The bottom of the liquid storage container 40 is further provided with a sewage suction pipe 43, one end of the sewage suction pipe 43 is communicated with the sewage outlet 42, and the other end is formed with a sewage suction opening, which is used for placing a sewage suction device, so as to suck the impurities deposited inside the liquid storage container 40.

[0049] Specifically, when the external metalworking equipment stops working, i.e. the cutting fluid is not continuously put into the filter device, the sewage outlet 42 can be directly opened, and the impurities deposited at the bottom of the liquid storage container 40 can be completely discharged. The liquid storage container 40 can also be washed by injecting a cleaning liquid at the opening 41. However, although the impurities can be completely discharged by directly opening the sewage outlet 42, the remaining cutting fluid inside the liquid storage container 40 will also be discharged, which is easy to cause waste. Therefore, the operation of completely discharging the impurities by directly opening the sewage outlet 42 can be performed once in a relatively long interval.

[0050] Secondly, during the daily use, when it is found that a certain amount of impurities has been accumulated at the bottom of the liquid storage container 40, or after a period of operation, the sewage suction device can be directly used to perform the sewage suction operation through the upper opening of the sewage suction pipe 43, so as to remove a small amount of impurities. Since the upper opening of the sewage suction pipe 43 can be arranged flush with the top opening of the liquid storage container 40, the removal of the impurities through the sewage suction pipe 43 can be performed at any time, even when the filter device is in operation. The sewage suction device can be a long suction pipe operated manually, or a liquid pump operated electrically.

[0051] In addition, when the liquid storage container 40 is provided with multiple liquid storage pipes, the drain port 42 and the suction pipe 43 can be provided separately for each liquid storage pipe, or the drain port 42 and the suction pipe 43 of multiple liquid storage pipes can be provided integrally. Both solutions can discharge or suck out the impurities deposited at the bottom of the liquid storage container 40.

[0052] In one embodiment, preferably, the liquid storage container 40 is provided with a first liquid storage pipe 10 and a second liquid storage pipe 20, the first liquid storage pipe 10 and the second liquid storage pipe 20 are respectively provided with a filter cover 50, the first liquid storage pipe 10 is provided with a first inlet port 11 and a first outlet port 12, the relative height of the first inlet port 11 is lower than the relative height of the first outlet port 12, the second liquid storage pipe 20 is provided with a second inlet port 21 and a second outlet port 22, the relative height of the second inlet port 21 is lower than the relative height of the second outlet port 22, the first inlet port 11 is used to put used cutting fluid, the first outlet port 12 is in communication with the second inlet port 21, and the second outlet port 22 is used to discharge filtered cutting fluid.

[0053] Specifically, in this embodiment, two-stage filtering devices can be formed by providing the first liquid storage pipe 10 and the second liquid storage pipe 20, so that the cutting fluid can be repeatedly used after being filtered twice by the filter cover 50. The first outlet port 12 and the second inlet port 21 can be connected by a transition pipe 44 to form a communication state.

[0054] In another embodiment, as shown in Figures 1 to 4 Preferably, the liquid storage container 40 is further provided with a third liquid storage pipe 30, the third liquid storage pipe 30 is provided with a filter cover 50, the third liquid storage pipe 30 is provided with a third inlet port 31 and a third outlet port 32, the relative height of the third inlet port 31 is lower than the relative height of the third outlet port 32, the second outlet port 22 and the third inlet port 31 form a communication state, and the third outlet port 32 is used to discharge filtered cutting fluid.

[0055] Specifically, compared with the previous embodiment, the third liquid storage pipe 30 is added in this embodiment to form a three-stage filtering device, so that the cutting fluid can be repeatedly used after being filtered three times by the filter cover 50. The second outlet port 22 and the third inlet port 31 can be connected by a transition pipe 44 to form a communication state.

[0056] In addition, it can be understood that more liquid storage pipes and filter covers 50 can be provided according to the actual use scene to form more stages of the circulating filtering device.

[0057] In use, first, the metal processing fluid, such as cutting fluid, can flow into the middle and lower segment of the liquid storage container 40 through the inlet, and the bottom drain port 42 is kept closed and sealed when no draining is performed. Thus, as the cutting fluid continues to be injected, the liquid will flow back up to the top. And then, the cutting fluid will pass through the filter cover 50 from bottom to top, and then be discharged from the outlet of the upper segment of the liquid storage container 40, so as to achieve the corresponding cleanliness and be reused repeatedly. For the multi-stage filter device, the cutting fluid can pass through the first liquid storage pipe 10, the second liquid storage pipe 20 and the third liquid storage pipe 30 in sequence, so that the cutting fluid can be filtered and adsorbed by the corresponding filter cover 50 in sequence, so as to achieve the corresponding cleanliness and be reused repeatedly.

[0058] When the external metal processing equipment is working normally, the cutting fluid can be continuously injected into the filter device for continuous and circulating precipitation and filtration treatment, so that the cutting fluid can be reused repeatedly, the consumption of the cutting fluid is reduced, and the processing cost is reduced.

[0059] When the equipment stops working, the cutting fluid can also continue to be precipitated in the liquid storage container 40, so that the impurities continue to be precipitated in the drain port 42, and the subsequent draining treatment is facilitated.

[0060] It should be noted that the cutting fluid mentioned in the present application not only refers to the cutting fluid in metal processing, but also refers to the coolant and other metal processing fluids in electro-processing and electro-erosion processing. At the same time, the circulating filter device in the present application can also be used in all scenes where liquid needs to be reused or purified and filtered. For example, the water in the breeding pool can be filtered. In this case, a magnet can not be used, or other materials in the prior art can be used for scalable purification and filtration treatment to expand its application range. The main use scene of the present circulating filter device is the cooling fluid circulating filter use scene in the wire cutting electric spark machine tool processing. However, it is not limited to this use scene, but also applicable to other engineering, agricultural, family, factory, building, chemical and other industries. As long as the use scene needs to be filtered and treated, the circulating filter device in the present application can be installed and configured.

[0061] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A multi-stage reflux sedimentation circulating filtration device, characterized in that, The application relates to a cutting fluid filtering device, which comprises a storage container (40) and a filtering cover (50), the storage container (40) is provided with an inlet and an outlet, and is in communication with an internal storage space, the filtering cover (50) is installed in the internal storage space of the storage container (40), cutting fluid enters the storage container (40) from the inlet, is filtered by the filtering cover (50), and is discharged from the outlet; the relative height of the inlet is lower than that of the outlet, so that the cutting fluid passes through the filtering cover (50) from bottom to top and filtering is completed.

2. The multi-stage backwash sedimentation type circulating filter apparatus according to claim 1, wherein The filtering cover (50) is provided with a filtering assembly (60) for filtering impurities in the cutting fluid.

3. The multi-stage backwash sedimentation type circulating filter apparatus according to claim 1, wherein The filtering cover (50) is provided with an adsorption assembly (70) for magnetically adsorbing the magnetically adsorbable substances in the cutting fluid.

4. The multi-stage, backflow, settling, circulating filter apparatus of claim 1, wherein, The filtering cover (50) is provided with the filtering assembly (60) and the adsorption assembly (70) which are fixed to each other, the filtering assembly (60) is provided with a basket (61), filtering material (62) is arranged in the basket (61) and used for filtering the cutting fluid, the adsorption assembly (70) is provided with a hollow pipe (71), one end of the hollow pipe (71) extends upwards to form an open end (72), the other end of the hollow pipe (71) is fixed to the basket (61) and is provided with a closed structure to form a closed end (73), the hollow pipe (71) is internally provided with a magnetic piece (74) and a pull rod (75), one end of the pull rod (75) is fixed to the magnetic piece (74) and the magnetic piece (74) penetrates into the closed end (73) of the hollow pipe (71), the other end of the pull rod (75) extends out of the hollow pipe (71) by a certain length to form a hand holding end (76).

5. A multi-stage backwash sedimentation type circulating filter apparatus according to claim 4, wherein The filtering cover (50) is further provided with an auxiliary spring (52) and an auxiliary net (53), one end of the auxiliary spring (52) is fixed to the open end (72) of the upper part of the hollow pipe (71), the other end of the auxiliary spring (52) is fixed to the peripheral side wall of the basket (61) and forms a spiral supporting structure around the hollow pipe (71), the auxiliary net (53) is sleeved on the supporting structure formed by the auxiliary spring (52) and one end of the auxiliary net (53) is fixed to the peripheral side wall of the basket (61) and the other end of the auxiliary net (53) is fixed to the open end (72) of the upper part of the hollow pipe (71).

6. The multi-stage, backflow, settling, cyclic filter apparatus of claim 4, wherein, The filtering cover (50) is further provided with a sealing ring (51), the inner side wall of the sealing ring (51) is fixed to the peripheral side wall of the basket (61) and the outer side wall of the sealing ring (51) abuts against the inner side wall of the filtering container, so that the cutting fluid is prevented from flowing through the gap between the filtering container and the basket (61).

7. The multi-stage, backflow, settling, cyclic filter apparatus of claim 1 wherein, The bottom of the storage container (40) is further provided with a sewage outlet (42), the sewage outlet (42) is in communication with the internal storage space of the storage container (40) and is used for discharging the impurities deposited in the internal storage space of the storage container (40).

8. The multi-stage, backflow, settling, cyclic filter apparatus of claim 7, wherein, The bottom of the liquid storage container (40) is also provided with a dirt suction pipe (43), one end of the dirt suction pipe (43) is communicated with the dirt discharge port (42), and the other end is formed with a dirt suction opening for placing a dirt suction device to suck the impurities deposited in the liquid storage container (40).

9. The multi-stage, back-flow, settling, cyclic, filter apparatus of claim 1, wherein, The liquid storage container (40) is provided with a first liquid storage pipe (10) and a second liquid storage pipe (20), the first liquid storage pipe (10) and the second liquid storage pipe (20) are respectively provided with a filter cover (50), the first liquid storage pipe (10) is provided with a first inlet (11) and a first outlet (12), the relative height of the first inlet (11) is lower than that of the first outlet (12); the second liquid storage pipe (20) is provided with a second inlet (21) and a second outlet (22), the relative height of the second inlet (21) is lower than that of the second outlet (22); the first inlet (11) is used for placing used cutting fluid, the first outlet (12) is in communication with the second inlet (21), and the second outlet (22) is used for discharging filtered cutting fluid.

10. The multi-stage, backflow, settling, cyclic filter apparatus of claim 9, wherein, The liquid storage container (40) is also provided with a third liquid storage pipe (30), the third liquid storage pipe (30) is provided with a filter cover (50), the third liquid storage pipe (30) is provided with a third inlet (31) and a third outlet (32), the relative height of the third inlet (31) is lower than that of the third outlet (32); the second outlet (22) is in communication with the third inlet (31), and the third outlet (32) is used for discharging filtered cutting fluid.

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