CN110877936A

CN110877936A - Cutting fluid purifying and filtering device

Info

Publication number: CN110877936A
Application number: CN201911306823.6A
Authority: CN
Inventors: 周品文; 李志敏
Original assignee: Zhejiang Cis Intelligent Equipment Co Ltd
Current assignee: Zhejiang Cis Intelligent Equipment Co Ltd
Priority date: 2019-12-18
Filing date: 2019-12-18
Publication date: 2020-03-13
Anticipated expiration: 2039-12-18
Also published as: CN110877936B

Abstract

The invention provides a cutting fluid purifying and filtering device, which comprises an adsorption device; a pre-filter device; an oil-water separation device; the three-stage filtering device is connected with the oil-water separation device; the adsorption device includes: one end of the water pumping pipe is closed, and a water pumping hole is formed in the water pumping pipe; the movable component can be sleeved on the water pumping pipe in a sliding mode along the water pumping pipe, a gap is formed between the movable component and the water pumping pipe in the radial direction, and a suction inlet is formed at the lower portion of the gap; and the telescopic sleeve is provided with a bottom surface fixed by one end of the water pumping pipe, a side surface capable of axially stretching and retracting along the water pumping pipe and a top surface connected with the moving component, at least the side surface of the telescopic sleeve is configured to be capable of allowing liquid to pass through, and when the side surface is stretched and retracted along the axial direction of the water pumping pipe, the top surface drives the moving component to move along the axial direction of the water pumping pipe.

Description

Cutting fluid purifying and filtering device

Technical Field

The invention relates to a cutting fluid purifying and filtering device which is used for recovering floating oil, purifying and recycling cutting fluid.

Background

Modern metal processing can not avoid cooling and lubricating of cutting fluid, but the cutting fluid is extremely easy to be polluted by guide rail oil and particles, the processing precision of a workpiece can be damaged to a certain degree, the yield is reduced, serious cutter loss is caused, and the deterioration of the cutting fluid even causes expensive pollution treatment cost. The cutting fluid is formed into thick floating oil due to the infiltration of guide rail oil, lubricating grease and the like in the using process, a large amount of powder and particle impurities are generated in the cutting process, and therefore a large amount of harmful bacteria such as anaerobic bacteria can be bred, the cutting fluid smells and goes bad, the waste cutting fluid is replaced and treated, much inconvenience is brought to production, the health of workers is endangered, the production cost of enterprises is increased, and the like.

Cutting fluid filtration equipment among the prior art has following shortcoming: the cutting fluid filtering equipment in the prior art has the defects of large scale, incomplete filtering and low oil-water separation degree; in the cutting fluid filtering equipment in the prior art, when water is pumped, a water pumping pipe extends into the bottom of a container to pump the liquid, a large amount of iron cuttings can be sucked, the subsequent separation is not facilitated, and even a filtering device is damaged; when the pumping pipe pumps liquid, a large amount of water is pumped in, so that the filtering efficiency of the subsequent filtering device is reduced.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a cutting fluid purifying and filtering device with a reasonable structural design.

The technical scheme adopted by the embodiment of the invention for solving the problems is as follows: a cutting fluid purifying and filtering device is characterized by comprising:

an adsorption device;

the front-mounted filtering device is connected with the adsorption device;

the oil-water separation device is connected with the pre-filtering device; and

the three-stage filtering device is connected with the oil-water separation device;

the adsorption device includes:

one end of the water pumping pipe is closed, and a water pumping hole is formed in the water pumping pipe;

the movable component can be sleeved on the water pumping pipe in a sliding mode along the water pumping pipe, a gap is formed between the movable component and the water pumping pipe in the radial direction, and a suction inlet is formed at the lower portion of the gap; and

the telescopic sleeve is provided with a bottom surface fixed by one end of the water pumping pipe, a side surface capable of being axially stretched and contracted along the water pumping pipe and a top surface connected with the moving component, at least, the side surface of the telescopic sleeve is configured to be capable of allowing liquid to pass through, and when the side surface is stretched and contracted along the axial direction of the water pumping pipe, the top surface drives the moving component to move along the axial direction of the water pumping pipe.

In the embodiment of the invention, the side surface is configured to expand after absorbing liquid, so that the side surface stretches along the water pumping pipe.

The cross-sectional shape of the side surface in the embodiment of the invention is configured to be wave-shaped or fold-line-shaped.

In the embodiment of the invention, the moving component is provided with a buoyancy structure so as to increase the buoyancy of the moving component.

The buoyancy structure is a groove arranged on the upper surface of the moving component.

The buoyancy structure is a closed inner cavity arranged at the upper part of the moving component.

In the embodiment of the invention, the movable component is provided with an annular mounting groove, and the inner side edge of the top surface of the telescopic sleeve is clamped into the mounting groove for fixing.

In the embodiment of the invention, the position of the suction inlet is lower than that of the water pumping hole.

The telescopic sleeve provided by the embodiment of the invention is made of rubber.

The embodiment of the invention also comprises an installation plate, wherein the installation plate is fixed at the end part of the water pumping pipe so as to seal one end of the water pumping pipe, and the bottom surface of the telescopic sleeve is fixed on the installation plate.

The oil-water separation device of the embodiment of the invention comprises:

a separation cylinder having an accommodation chamber; and

a liquid inlet pipe which is communicated with the separation cylinder and is configured to feed liquid to the separation cylinder;

the upper part of the separating cylinder is provided with a first bin and a second bin, the first bin is communicated with the accommodating cavity through an oil overflow port, the first bin is provided with an oil collecting port, and liquid in the accommodating cavity flows into the first bin through the oil overflow port and is recovered from the oil collecting port;

and a pipe part is arranged in the second bin, the lower end of the pipe part extends into the separating cylinder, the upper end of the pipe part is communicated with the second bin, an outlet part is arranged at the upper end of the pipe part, a water outlet is arranged at the upper end of the outlet part, and the height of the water outlet is lower than the oil overflow port.

The outlet part of the embodiment of the invention comprises a connecting part and an adjusting unit, wherein the adjusting unit can be arranged on the connecting part in an up-and-down adjusting mode along the axial direction of the pipe part so as to adjust the height of the water outlet.

According to the embodiment of the invention, the adjusting unit is in threaded connection with the connecting part, and the connecting part is fixed at the upper end of the pipe part.

The adjusting unit is provided with a holding part.

In the embodiment of the invention, the upper part of the accommodating cavity is provided with an opening part, the position of the opening part is matched with the height positions of the first bin and the second bin, a first cover plate is arranged at the opening part, the first cover plate is provided with a buffer plate, the buffer plate is inclined in the direction away from the liquid inlet pipe in the downward process, the buffer plate divides the opening part into a first part and a second part, the liquid inlet pipe corresponds to the first part, and the second part corresponds to the oil overflow port.

The bottom of the separating cylinder is provided with an emptying pipe.

In the embodiment of the present invention, the lower end of the pipe portion extends at least to a position beyond the middle of the separation cylinder in the height direction.

In the embodiment of the invention, the bottom of the oil overflow port is straight, and the width of the oil overflow port is at least one third of the diameter of the separation cylinder.

The second bin provided by the embodiment of the invention is provided with a backflow port, and the position of the backflow port is lower than that of the water outlet.

Compared with the prior art, the invention has the following advantages and effects: the structure is simple, and the design is reasonable; the cutting fluid is conveyed through the adsorption device in the most direct and scientific mode, so that the floating oil and impurities are separated more efficiently; the front-mounted filter device is arranged in front of the liquid inlet system, primary impurities are filtered before the liquid inlet system, and the front-mounted filter device can be detached and cleaned and is used repeatedly without replacement; after the cutting fluid enters the separation cylinder, the oil layer floats upwards under the action of gravity, oil-water separation is completed through the oil-water separation device, floating oil is discharged from the oil overflow port, the cutting fluid after oil-water separation enters the three-stage filtering device, and is filtered layer by layer, so that the cutting fluid is cleaner to reuse and has high filtering efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic perspective view of a cutting fluid purifying and filtering apparatus according to an embodiment of the present invention.

Fig. 2 is a schematic perspective view of the cutting fluid purifying and filtering apparatus in an embodiment of the present invention, with the cover removed.

Fig. 3 is a schematic three-dimensional structure diagram of the cutting fluid purifying and filtering device in the embodiment of the invention.

Fig. 4 is a schematic perspective view showing a cutting fluid purifying and filtering apparatus in an embodiment of the present invention with a housing removed.

Fig. 5 is a schematic perspective view of the cutting fluid purifying and filtering device in an embodiment of the present invention, with the housing removed.

Fig. 6 is a schematic perspective view of an adsorption apparatus in an embodiment of the present invention.

Fig. 7 is a schematic perspective view of the suction device of the embodiment of the present invention, with the bellows and the moving member removed.

Fig. 8 is a partial sectional structural schematic view of an adsorption apparatus in an embodiment of the present invention.

Fig. 9 is a schematic partial cross-sectional structure of an adsorption device in some embodiments.

Fig. 10 is a schematic partial cross-sectional structure of an adsorption apparatus in some embodiments.

FIG. 11 is a first perspective view of the oil-water separator according to the first embodiment of the present invention.

FIG. 12 is a second perspective view of the oil-water separator according to the embodiment of the present invention.

FIG. 13 is a schematic sectional view showing the oil-water separator according to the embodiment of the present invention.

Fig. 14 is a first perspective view of the first cover plate.

Fig. 15 is a schematic perspective view of the second cover plate.

FIG. 16 is a block diagram showing the construction of a cutting fluid purifying and filtering apparatus according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.

Example 1.

Referring to fig. 1 to 16, the cutting fluid purifying and filtering device of the present embodiment includes an adsorption device 1, a pre-filter device 3, an oil-water separation device 2, a tertiary filter device 4, and a housing 5.

In the embodiment, the pre-filtering device 3 is connected with the adsorption device 1; the oil-water separation device 2 is connected with the pre-filtering device 3; and the third-stage filtering device 4 is connected with the oil-water separation device 2. The connection is specifically performed by using a pipeline, and details are not described here.

In this embodiment, a vacuum pump 6 is provided, the vacuum pump 6 is provided on the pipeline between the adsorption apparatus 1 and the pre-filter apparatus 3, and the vacuum pump 6 provides power to the adsorption apparatus 1, so that the adsorption apparatus 1 can suck liquid and transport the liquid to the next step (e.g., the pre-filter apparatus 3).

In this embodiment, a booster pump 7 is provided, and the booster pump 7 is provided on the pipeline between the oil-water separation device 2 and the tertiary filtration device 4. The booster pump 7 may deliver the liquid to the tertiary filtration device 4.

The vacuum pump 6 and the booster pump 7 are prior art and will not be described herein.

In this embodiment, the pre-filter 3, the oil-water separator 2 and the tertiary filter 4 may be disposed in the housing.

The pre-filter device 3 in this embodiment may use a filter screen or filter paper for filtering, and details are not repeated. The front-mounted filter device 3 can be used for primary impurity filtration, and the filter screen or the filter paper can be detached and cleaned and can be repeatedly used without replacement.

The third-stage filtration device 4 in this embodiment has a triple filtration function. The cutting fluid enters a three-stage filtering device for filtering after oil-water separation and disinfection, the filtering precision is 5-10 microns, the use requirement can be directly met, the recycling is cleaner, and the cleanliness and the effect are higher than those of similar products. The tertiary filtration device 4 is per se prior art and may have triple filtration, e.g. three sets of filtration units with different filtration precision are provided. The filtering precision of the three groups of filtering units is increased in sequence. Specifically, tertiary filter equipment 4 comprises the filter core of tertiary different specifications, and filter core mesh number is different in tertiary filtration, and it is 50 microns respectively to be stainless steel filter core, line filter core 1600 meshes, pp cotton filter core 2000 + 3000 meshes, and the filter core is by thick to smart, filters layer upon layer, and the filtration resistance is little, and it is big to strain the flow, it is big to receive dirty volume, long service life, this product fiber diameter and clearance are adjustable in process of production, and the filter core micropore inlayer is little outer big, increase flow and receive dirty volume, the filter core is difficult for blockking, increase of service life.

The adsorption apparatus 1 of the present embodiment includes a suction pipe 11, a moving member 12, a telescopic sleeve 13, and a mounting plate 14.

One end of the water pumping pipe 11 in this embodiment is closed, the water pumping hole 111 is formed in the water pumping pipe 11, and negative pressure is generated in the water pumping pipe 11 during operation, so that liquid is sucked from the water pumping hole 111. In this embodiment, the vacuum pump 6 may be used to realize the negative pressure in the pumping pipe 11.

The moving member 12 in this embodiment is slidably sleeved on the pumping pipe 11 along the pumping pipe 11, and a gap is formed between the moving member 12 and the pumping pipe 11 in a radial direction, and a suction port 121 is formed at a lower portion of the gap. The present embodiment draws liquid into the gap through the suction port 121 and into the pumping hole 111.

The telescopic sleeve 13 in this embodiment has a bottom surface 131 fixed to the closed end of the pumping tube 11, a side surface 132 capable of axially extending and retracting along the pumping tube 11, and a top surface 133 connected to the moving member 12, at least the side surface 132 of the telescopic sleeve 13 is configured to allow liquid to pass through, and when the side surface 132 extends and retracts along the axial direction of the pumping tube 11, the top surface 133 drives the moving member 12 to move along the axial direction of the pumping tube 11, so that the position of the suction port 121 can be adjusted to adapt to an actual liquid level.

The adsorption device 1 in the embodiment has a simple structure and a reasonable design; through the arrangement of the telescopic sleeve 13, the position of the movable component 12 can be adjusted, so that the suction port 121 is matched with a specific liquid level; when the cutting fluid is to be retrieved to adsorption equipment, with the partly immersion liquid level of telescope tube 13, liquid gets into telescope tube 13 back, adjusts the position of removal component 12 through telescope tube 13 to make the sunction inlet correspond to the upper strata of liquid level, thereby extract the fluid on liquid level upper strata (fluid density is less than water, consequently, fluid can be located the upper strata), the extraction in-process, the liquid on upper strata can continuously get into inside telescope tube 13.

The side 132 is configured to expand upon absorption of liquid, thereby causing the side 132 to telescope along the suction tube 11. Specifically, the side surface 132 absorbs liquid (water or oil), which expands due to its material, so that the overall height of the side surface 132 increases, and the top surface 133 is driven to rise, and when the top surface 133 rises, the moving member 12 is driven to rise, thereby completing the position adjustment of the suction port 121. That is, when the bellows 13 is excessively immersed in the liquid, the suction port 121 is positioned high to prevent the suction of an excessive amount of water located at a relatively lower level.

The cross-sectional shape of the side 132 according to the present embodiment is configured to be wave-shaped or zigzag-shaped, so that the side 132 has a sufficient expansion and contraction amplitude in the axial direction of the pumping tube 11, thereby increasing the adjustment amplitude of the position of the suction port 121.

In this embodiment, the telescopic sleeve 13 is made of rubber in the prior art. The rubber material can expand after absorbing water, so that the telescopic sleeve 13 can stretch. In addition, when the telescopic sleeve 13 is made of the material, the filtering effect is achieved, specifically, the telescopic sleeve 13 can absorb a part of water, the water is prevented from entering the inside to be extracted, and impurities such as iron scraps can be prevented from entering the inside of the telescopic sleeve 13. In some embodiments, the elastic sheath 13 may also be made of water-absorbent resin or other materials, which can achieve the functions of water absorption and expansion and liquid permeation.

The moving member 12 of this embodiment has a buoyancy structure to increase the buoyancy of the moving member 12. If the buoyancy force on the displacement member 12 is not sufficient, the upper part of the gap between the displacement member 12 and the suction pipe 11 may be flooded with a large amount of water because the displacement member 12 is completely submerged. The provision of a buoyant structure, precisely to increase the buoyancy of the mobile member 12, prevents it from being completely submerged.

As shown in fig. 5, in some embodiments, the buoyant structure is a groove 122 disposed on an upper surface of the mobile member 12.

As shown in fig. 4, in some embodiments, the buoyant structure is a closed cavity 123 disposed in an upper portion of the mobile member 12.

In this embodiment, the movable member 12 has an annular mounting groove 124, and the inner edge of the top surface 133 of the telescopic sleeve 13 is clamped into the mounting groove 124 for fixing. If the telescopic sleeve 13 is made of soft material such as rubber, the connection can be detached through the above structure.

In this embodiment, the suction port 121 is located lower than the pumping hole 111. So as to dynamically adjust and absorb the oil in the upper layer by utilizing the characteristic that the position of the suction inlet 121 is adjustable.

The mounting plate 14 in this embodiment is fixed to the end of the pumping pipe 11, so as to seal one end of the pumping pipe 11, and the bottom surface 131 of the telescopic sleeve 13 is fixed to the mounting plate 14. Specifically, the bottom surface 131 may be secured to the mounting plate 14 by bolts.

The present embodiment may further be provided with a fixing unit 15 for fixing the pumping tube 11. Specifically, one end of the fixing unit 15 is fixed to the pumping pipe 11, and the other end thereof may be fixed to various positions of a table, a surface of a container, etc., so that the adsorption device is in a proper position.

The oil-water separator 2 in this embodiment includes a separation cylinder 21 and a liquid inlet pipe 22.

The separation cylinder 21 in this embodiment has a receiving cavity 211, the receiving cavity 211 is used for storing liquid or feeding liquid, the bottom of the receiving cavity 211 is closed, and at least a part of the upper portion is open.

The liquid inlet pipe 22 in this embodiment is communicated with the separation drum 21, and is configured to feed the separation drum 21. In use, waste liquid is transported from the liquid inlet pipe 22 to the accommodating cavity 211.

In this embodiment, a first bin 211 and a second bin 212 are disposed at the upper portion of the separation cylinder 21, the first bin 211 is communicated with the accommodating cavity 211 through an oil overflow port 213, the first bin 211 is provided with an oil collecting port 2111, the liquid in the accommodating cavity 211 flows into the first bin 211 through the oil overflow port 213, and the flowing liquid is recovered from the oil collecting port 2111.

In the second chamber 212 of this embodiment, a pipe 2121 is disposed inside, a lower end of the pipe 2121 extends into the separation cylinder 21, an upper end of the pipe 2121 is communicated with the second chamber 212, an outlet 2122 is disposed at an upper end of the pipe 2121, an upper end of the outlet 2122 has a water outlet 2123, and a height of the water outlet 2123 is lower than the oil overflow port 213. In one embodiment, the height of the water outlet 2123 is slightly lower than the height of the oil overflow port 213, for example, the height of the water outlet 2123 is 3-8 mm lower than the height of the oil overflow port 213. In one embodiment, the height of the water outlet 2123 is equal to or slightly higher than the height of the oil overflow opening 213, for example, the height of the water outlet 2123 is 0 to 5mm higher than the height of the oil overflow opening 213. After the liquid inlet pipe 22 enters the liquid, the liquid level in the accommodating cavity 211 rises, so that the oil floating on the water surface enters the first bin 211 through the oil overflow port 213. The height relationship between the water outlet 2123 and the oil overflow port 213 can control the liquid level height, and thus the oil layer thickness. If the liquid level in the accommodating chamber 211 is too high, the oil overflow port 213 will flow water to the first chamber 211 because the oil layer is too thin, and if the liquid level in the accommodating chamber 211 is too low, the oil overflow port 213 will accumulate oil for a long time or will not discharge oil when the oil layer is too thick.

The embodiment has simple structure and reasonable design; when the device is used, clean water is injected into the accommodating cavity 211, the liquid level of the accommodating cavity is slightly lower than the oil overflow port 213, then waste liquid is injected into the accommodating cavity 211 through the liquid inlet pipe 22, oil in the waste liquid floats on the water surface due to the fact that the density of the oil is lower than that of the water, flows into the first bin 211 through the oil overflow port 213, and is recovered or collected from the oil collection port 2111 of the first bin 211; the cutting fluid purifying and filtering device has the advantages of high separation efficiency, low cost, small volume and simple operation.

The outlet portion 2122 of the present embodiment includes a connecting portion 2124 and an adjusting unit 2125, wherein the adjusting unit 2125 is disposed on the connecting portion 2124 and is adjustable up and down along the axial direction of the pipe portion 2121 to adjust the height of the water outlet 2123. The height of the water outlet 2123 is adjusted by the adjusting unit 2125, so that the liquid level in the accommodating chamber 211 can be controlled, and an oil layer can flow into the first chamber 211 from the oil overflow port 213 more reasonably.

In this embodiment, the adjusting unit 2125 is threadedly coupled to the connecting portion 2124, and the connecting portion 2124 is fixed to the upper end of the tube portion 2121. When the adjusting unit 2125 rotates relative to the connecting portion 2124, the position of the adjusting unit 2125 changes, so that the height of the water outlet 2123 can be adjusted, and the operation is very convenient. In other embodiments, the adjusting unit 2125 may also adopt other structures in the prior art to implement a height-adjustable connection between the adjusting unit 2125 and the connecting portion 2124, such as a socket connection.

The adjusting unit 2125 of this embodiment is provided with a holding portion 2126. Thereby facilitating the rotation of the adjusting unit 2125.

In this embodiment, the upper portion of the accommodating chamber 211 has an opening, the position of the opening matches the height positions of the first bin 211 and the second bin 212, a first cover plate 2128 is disposed at the opening, the first cover plate 2128 has a buffer plate 2129, the buffer plate 2129 inclines in a direction away from the liquid inlet pipe 22 in a downward process, the buffer plate 2129 divides the opening into a first portion and a second portion, the liquid inlet pipe 22 corresponds to the first portion, and the second portion corresponds to the oil overflow port 213. The arrangement of the buffer plate 2129 has a certain buffer function on the cutting fluid entering the accommodating cavity 211 from the fluid inlet pipe 22, so as to form a small cavity, which is beneficial to the concentration of floating oil. Cover 2128 is provided to prevent spillage.

The bottom of the separator drum 21 in this embodiment is provided with a drain pipe 214. So that the cutting fluid in the containing cavity 211 can be drained in time after the equipment stops running.

In this embodiment, the lower end of the pipe portion 2121 extends at least to a position beyond the middle of the separation tube 21 in the height direction. To prevent the upper layer of oil from entering the tube 2121 and draining from the second bin 212.

In this embodiment, the bottom of the oil overflow port 213 is straight, and the width of the oil overflow port 213 is at least one third of the diameter of the separation cylinder 21. So that the oil layer can be quickly passed through the oil overflow port 213.

In this embodiment, the second chamber 212 has a return port 2120, and the return port 2120 is lower than the water outlet 2123. After the water flows into the second chamber 212, the water is discharged from the return port 2120.

The housing 5 in this embodiment has a cover 51, and the cover 51 is detachably mounted on the housing 5. For example, the cover 51 may be fixed to the housing 5 by a hinge, or may be directly detachably fixed to the housing 5. The cover 51 is positioned corresponding to the first bin 211 and the second bin 212, and when the cover 51 is opened, the first bin 211 and the second bin 212 are exposed, thereby facilitating the maintenance and repair. When the impurities are more, the cleaning can be carried out in time.

Referring to fig. 16, the working principle of the present embodiment: a liquid storage tank 8 is arranged for storing cutting liquid; the adsorption device 1 extracts liquid from the liquid storage tank 8 and conveys the liquid to the pre-filter device 3, the pre-filter device 3 preliminarily filters the liquid (filters impurities), and the liquid enters the oil-water separation device 2; set up an oil storage tank 9, oil-water separator 2 carries out the oil-water separation to liquid, and fluid is discharged into oil storage tank 9, and filters out the liquid behind the fluid accessible evacuation pipe 214 on the one hand and directly gets into the liquid reserve tank 8 and go on, and on the other hand liquid accessible pipeline gets into tertiary filter equipment 4 and filters, and the liquid after the filtration directly gets into liquid reserve tank 8 and utilizes.

The above description of the present invention is intended to be illustrative. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. A cutting fluid purifying and filtering device is characterized by comprising:

an adsorption device;

the front-mounted filtering device is connected with the adsorption device;

the oil-water separation device is connected with the pre-filtering device; and

the adsorption device includes:

2. The cutting fluid purifying and filtering device according to claim 1, wherein the side is configured to expand after absorbing the fluid, thereby causing the side to expand and contract along the pumping tube.

3. The cutting fluid purifying and filtering device according to claim 1, wherein the moving member has a buoyancy structure to increase buoyancy of the moving member.

4. The cutting fluid purifying and filtering apparatus according to claim 3, wherein the buoyancy structure is a groove provided on an upper surface of the moving member.

5. The cutting fluid purifying and filtering device according to claim 1, wherein the oil-water separating device comprises:

a separation cylinder having an accommodation chamber; and

6. The cutting fluid purifying and filtering device according to claim 5, wherein the outlet portion includes a connecting portion and an adjusting unit, and the adjusting unit is disposed on the connecting portion and is adjustable up and down along an axial direction of the pipe portion to adjust a height of the water outlet.

7. The cutting fluid purifying and filtering apparatus as claimed in claim 5, wherein the adjusting unit is screw-coupled with the coupling part, and the coupling part is fixed to an upper end of the pipe part.

8. The cutting fluid purifying and filtering apparatus as claimed in claim 5, wherein the receiving chamber has an opening at an upper portion thereof, the opening being positioned to match a height of the first chamber and the second chamber, a first cover plate is provided at the opening, the first cover plate has a buffer plate, the buffer plate is inclined in a direction away from the fluid inlet pipe in a downward process, the buffer plate divides the opening into a first portion and a second portion, the fluid inlet pipe corresponds to the first portion, and the second portion corresponds to the oil overflow port.

9. The cutting fluid purifying and filtering device according to claim 5, wherein the lower end of the tube portion extends at least to a position beyond a middle position in a height direction of the separation cylinder.

10. The cutting fluid purifying and filtering apparatus as claimed in claim 5, wherein the bottom of the oil overflow port is straight, and the width of the oil overflow port is at least one third of the diameter of the separation cylinder.