Metalworking fluid filtration equipment and filtration process

Abstract

The present invention provides a metalworking fluid filtering device and a filtering process, which relate to the technical field of filtering devices. The metalworking fluid filtering device includes a shell and a vibration device. A cylindrical filter screen with a vertical axis is provided in the shell. A first chamber is formed inside the cylindrical filter screen, a second chamber is formed between the cylindrical filter screen and the shell, and a collecting chamber is formed on the shell below the cylindrical filter screen. Metalworking fluid containing impurities enters the first chamber in the cylindrical filter screen from a liquid inlet, passes through the cylindrical filter screen to flow to the second chamber under the action of liquid pressure, and is discharged from a liquid outlet. Impurities such as waste chips in the metalworking fluid are filtered through the cylindrical filter screen and are located in the first chamber. They enter the collecting chamber under the action of gravity and are collected. At the same time, the vibration device vibrates the cylindrical filter screen to vibrate off impurities attached to the cylindrical filter screen, thereby reducing the probability of blockage and avoiding affecting the filtering effect and equipment operation.

Description

Technical Field

[0001] The present invention relates to the technical field of filtering equipment, in particular to a metalworking fluid filtering equipment and a filtering process. Background Art

[0002] Metalworking fluids are functional liquids used in metal cutting, grinding, forming (stamping, rolling, drawing, etc.), and heat treatment processes. They primarily perform four core functions: lubrication, cooling, cleaning, and rust prevention. They reduce friction and wear between tools and workpieces, dissipate heat generated during machining, flush away chips and metal powder, and prevent corrosion of machine tools and workpieces. Widely used in various metalworking applications, they significantly improve machining efficiency, workpiece surface quality, and extend tool life.

[0003] During use, metalworking fluids mix with impurities such as scrap metallurgy generated during the metalworking process. To improve the utilization rate of metalworking fluids, filtration equipment is typically used to recycle the fluids. This removes impurities generated during processing, extends the fluid's lifespan, and reduces production costs. However, existing metalworking fluid filtration equipment can easily clog the filter screen due to scrap metallurgy and other impurities, impacting filtration efficiency and equipment operation.

[0004] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Summary of the Invention

[0005] Based on this, it is necessary to provide a metalworking fluid filtering device to address the problems existing in current filtering equipment.

[0006] The above purpose is achieved through the following technical solutions:

[0007] A metalworking fluid filtering device includes a shell and a vibration device, wherein a liquid inlet and a liquid outlet are respectively formed on both sides of the shell, a cylindrical filter screen with a vertical axis is provided in the shell, an opening is formed at the lower end of the cylindrical filter screen, a first chamber is formed in the cylindrical filter screen, the liquid inlet is connected to the first chamber through the opening, a second chamber connected to the liquid outlet is formed between the cylindrical filter screen and the shell, a collecting chamber is formed on the shell below the cylindrical filter screen, and the collecting chamber is used to collect impurities in the metalworking fluid; the vibration device is arranged in the shell, and the vibration device is used to vibrate the cylindrical filter screen.

[0008] Furthermore, a coil spring is provided in the cylindrical filter screen, and the circumferential surface of the cylindrical filter screen is bent in sequence along the trajectory of the coil spring to form a spiral corrugated structure. The upper end of the coil spring is connected to the shell, and the lower end of the coil spring is connected to the output end of the vibration device. The vibration device causes the cylindrical filter screen to vibrate axially back and forth through the coil spring.

[0009] Furthermore, an inner surface of the coil spring is formed with an inclined surface, and the inclined surface is inclined from top to bottom and from outside to inside.

[0010] Furthermore, the outer surface of the coil spring is a curved surface.

[0011] Furthermore, a screw is threadedly connected to the shell, the end of the screw extends into the second chamber and is provided with a pressure plate, and the upper end of the coil spring is connected to the pressure plate.

[0012] Furthermore, the vibration device is an electromagnetic vibrator, which generates a leakage magnetic field around it when in operation to absorb ferromagnetic impurities in the metalworking fluid.

[0013] Furthermore, the liquid inlet faces the electromagnetic vibrator.

[0014] Furthermore, a spherical shell is rotatably provided in the collection chamber, and a material port is provided on the spherical shell. The spherical shell can rotate between a first position and a second position. When in the first position, the material port faces the opening to collect impurities in the metalworking fluid. When in the second position, the material port turns away from the opening to discharge the impurities collected in the metalworking fluid.

[0015] Furthermore, a plurality of blind holes are formed on the outer surface of the spherical shell at equal intervals along its circumference, and the axes of the plurality of blind holes and the axis of the feed port are located on the same vertical plane.

[0016] In addition, the present invention also provides the following technical solutions:

[0017] A metalworking fluid filtration process comprises the following steps:

[0018] Allow metalworking fluids containing impurities to settle;

[0019] The supernatant after sedimentation is introduced into a pre-filtration unit for pre-filtration to obtain a pre-filtered liquid;

[0020] The pre-filtered liquid is introduced into the housing from the liquid inlet, and the pre-filtered liquid passes through the cylindrical filter screen from the first chamber into the second chamber to obtain the fine filtered liquid which is discharged from the liquid outlet. Impurities sink from the first chamber to the collection chamber and are collected.

[0021] The fine filtrate is ultrasonically sterilized, and the pH value and concentration of the fine filtrate are adjusted to the target range.

[0022] The beneficial effects of the present invention are as follows: metalworking fluid containing impurities enters the first chamber in the cylindrical filter screen from the liquid inlet, passes through the cylindrical filter screen under the action of liquid pressure and flows to the second chamber, and is discharged from the liquid outlet; while impurities such as waste chips in the metalworking fluid are filtered through the cylindrical filter screen and are located in the first chamber, and are collected in the collection chamber under the action of gravity; at the same time, the vibration device vibrates the cylindrical filter screen to vibrate off impurities attached to the cylindrical filter screen, thereby reducing the probability of blockage and avoiding affecting the filtering effect and equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 An axonometric view of a metalworking fluid filtration device provided in an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A top view of the metalworking fluid filtration equipment;

[0025] Figure 3 for Figure 2 AA section view of the metalworking fluid filtration equipment;

[0026] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0027] Figure 5 for Figure 3 A partial enlarged view of point C in the middle;

[0028] Figure 6 for Figure 3 Schematic diagram of the structure of the mesosphere shell;

[0029] Figure 7 for Figure 3 Schematic diagram of the connection of the coil spring.

[0030] in:

[0031] 100, housing; 101, liquid inlet; 102, liquid outlet;

[0032] 200, vibrating device; 201, lower mounting frame; 202, upper mounting frame; 203, first leak hole; 204, second leak hole; 205, corrugated sleeve;

[0033] 300, cylindrical filter; 301, first chamber; 302, second chamber; 303, collecting chamber; 304, coil spring; 305, cylinder; 306, inclined plane; 307, screw; 308, pressure plate; 309, knob; 310, ball shell; 311, feed port; 312, sealing ring; 313, blind hole. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0036] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0037] like Figures 1 to 7 As shown, an embodiment of the present invention provides a metalworking fluid filtering device, including a shell 100 and a vibration device 200, wherein a liquid inlet 101 and a liquid outlet 102 are respectively formed on both sides of the shell 100, a cylindrical filter screen 300 with a vertical axis is provided in the shell 100, an opening is formed at the lower end of the cylindrical filter screen 300, a first chamber 301 is formed in the cylindrical filter screen 300, the liquid inlet 101 is connected to the first chamber 301 through the opening, a second chamber 302 connected to the liquid outlet 102 is formed between the cylindrical filter screen 300 and the shell 100, a collecting chamber 303 is formed on the shell 100 and is located below the cylindrical filter screen 300, and the collecting chamber 303 is used to collect impurities in the metalworking fluid; the vibration device 200 is arranged in the shell 100, and the vibration device 200 is used to vibrate the cylindrical filter screen 300.

[0038] The metalworking fluid containing impurities enters the first chamber 301 in the cylindrical filter 300 through the liquid inlet 101, passes through the cylindrical filter 300 under the action of liquid pressure, flows to the second chamber 302, and is discharged from the liquid outlet 102. The waste chips and other impurities in the metalworking fluid are filtered by the cylindrical filter 300 and remain in the first chamber 301. Under the action of gravity, they enter the collection chamber 303 for collection. At the same time, the vibration device 200 vibrates the cylindrical filter 300 to vibrate and remove impurities attached to the cylindrical filter 300, thereby reducing the probability of blockage and avoiding affecting the filtering effect and equipment operation.

[0039] The collecting chamber 303 is connected to the first chamber 301 through an opening.

[0040] Preferably, a coil spring 304 is provided in the cylindrical filter 300, and the circumferential surface of the cylindrical filter 300 is bent in sequence along the trajectory of the coil spring 304 to form a spiral corrugated structure. The upper end of the coil spring 304 is connected to the shell 100, and the lower end of the coil spring 304 is connected to the output end of the vibration device 200. The vibration device 200 causes the cylindrical filter 300 to vibrate axially back and forth through the coil spring 304.

[0041] The output end of the vibration device 200 drives the coil spring 304 to vibrate axially and reciprocatingly as a whole, so that the cylindrical filter screen 300 vibrates axially and reciprocatingly. At the same time, the coil spring 304 is locally deformed to perform axial reciprocating expansion and contraction, so that the cylindrical filter screen 300 is expanded and contracted axially along its corrugated structure, so as to more efficiently remove impurities attached to the cylindrical filter screen 300. At the same time, the coil spring 304 also supports the axial vibration and axial expansion and contraction of the cylindrical filter screen 300.

[0042] Furthermore, impurities in the metalworking fluid within first chamber 301 sink under gravity, causing accumulation of impurities on the underside of cylindrical filter screen 300. This results in high filtration pressure, poor filtration efficiency, and even clogging of the underside of cylindrical filter screen 300. The output end of vibrating device 200 drives coil spring 304 and cylindrical filter screen 300 to axially reciprocate, with the vibration amplitude and efficiency increasing as the area nears the underside of cylindrical filter screen 300. This solves the aforementioned problem and reduces the probability of clogging of cylindrical filter screen 300.

[0043] Among them, the cylindrical filter screen 300 is made of elastic material, which can reciprocate and expand and contract in its axial direction, and can also produce slight deformation in the radial direction. When the cylindrical filter screen 300 is impacted by the metalworking fluid and the impurities therein, it can achieve a buffering effect by generating deformation, thereby preventing the cylindrical filter screen 300 from being damaged by the impact.

[0044] A cylindrical body 305 is formed within the housing 100. The left end of the cylindrical body 305 communicates with the liquid inlet 101. The lower end of the cylindrical filter 300 is fixed to the upper end of the cylindrical body 305, so that the upper end of the cylindrical body 305 communicates with the first chamber 301, and the lower end of the cylindrical body 305 communicates with the collection chamber 303. Metalworking fluid enters the cylindrical body 305 through the liquid inlet 101 and rises to the first chamber 301 within the cylindrical filter 300. After being filtered, it enters the second chamber 302 and is discharged through the liquid outlet 102. Impurities remain in the first chamber 301 and sink, passing through the cylindrical body 305 and into the collection chamber 303.

[0045] Preferably, see Figure 4 The inner surface of the coil spring 304 is formed with an inclined surface 306, which is inclined from top to bottom and from outside to inside.

[0046] After the impurities attached to the cylindrical filter screen 300 are vibrated off by the vibration device 200 , they slide downward along the inclined surface 306 , thereby reducing the probability of the impurities attaching to the cylindrical filter screen 300 again after being removed.

[0047] Preferably, the outer surface of the coil spring 304 is an arc surface to reduce wear between the coil spring 304 and the cylindrical filter screen 300 and extend the service life.

[0048] Preferably, a screw 307 is threadedly connected to the housing 100 , the end of the screw 307 extends into the second chamber 302 and is provided with a pressure plate 308 , and the upper end of the coil spring 304 is connected to the pressure plate 308 .

[0049] The screw 307 is rotated to drive the pressure plate 308 to rise and fall, thereby adjusting the axial vibration amplitude and axial expansion and contraction amplitude of the cylindrical filter screen 300 , and at the same time, the filtering speed of the cylindrical filter screen 300 can be adjusted.

[0050] The upper end of the screw rod 307 is fixed with a knob 309, and the lower end is fixed to the pressure plate 308. A seal is provided between the screw rod 307 and the housing 100 to achieve a sealed connection between the two.

[0051] The upper end of the cylindrical filter screen 300 is closed and abuts or is fixed to the pressure plate 308. The upper end of the coil spring 304 abuts or is fixed to the upper end of the cylindrical filter screen 300.

[0052] Preferably, the vibration device 200 is an electromagnetic vibrator, which generates a leakage magnetic field around it when in operation to absorb ferromagnetic impurities in the metalworking fluid.

[0053] The leakage magnetic field generated by the electromagnetic vibrator during operation attracts ferromagnetic impurities in the metalworking fluid, reducing the probability of ferromagnetic impurities entering the cylindrical filter 300 and thereby reducing the probability of clogging of the cylindrical filter 300. The adsorbed ferromagnetic impurities are vibrated off by the electromagnetic vibrator and, under the influence of gravity, are collected in the collection chamber 303.

[0054] The electromagnetic vibrator is arranged in the cylinder 305. Figure 3 、 Figure 7 The cylinder 305 is provided with a lower mounting frame 201 and an upper mounting frame 202. The base of the electromagnetic vibrator is fixed to the lower mounting frame 201, and the upper mounting frame 202 is fixed to the output end of the electromagnetic vibrator. The lower end of the coil spring 304 is fixed to the upper mounting frame 202. The lower mounting frame 201 is provided with a first leakage hole 203, and the upper mounting frame 202 is provided with a second leakage hole 204. After the impurities in the first chamber 301 sink, they enter the collection chamber 303 through the second leakage hole 204 and the first leakage hole 203 in sequence. In addition, a corrugated sleeve 205 is provided between the lower mounting frame 201 and the upper mounting frame 202 to protect the electromagnetic vibrator and isolate the metalworking fluid and impurities outside the corrugated sleeve 205. The power supply circuit of the electromagnetic vibrator can pass through the housing 100 or the cylinder 305 and is equipped with a corresponding power supply and controller to facilitate control of start and stop and selection of different operating conditions.

[0055] Among them, the electromagnetic vibrator includes: an electromagnet system, which includes a coil, an iron core and a yoke; an armature; an elastic system; a mass; a base or frame, etc. The electromagnetic vibrator generates an alternating magnetic field by driving the coil with current, causing the magnetic attraction between the iron core and the armature to change periodically. It mainly includes: the attraction stage, in which power is applied to generate magnetic force and overcome the resistance of the elastic system, pulling the output end to move to store energy; the reset stage, in which power is removed, the elastic system releases potential energy, and pushes the output end to move in the opposite direction; the above-mentioned attraction stage and reset stage are cycled at high frequency to form micro-vibration. The specific structure and working principle of the electromagnetic vibrator are all existing technologies and will not be elaborated here.

[0056] Additionally, electromagnetic vibrators can generate leakage magnetic fields for the following reasons: First, to enable the armature to vibrate, the electromagnetic vibrator's magnetic circuit requires one or more working air gaps, such as the gap between the armature and the core. However, the magnetic resistance of an air gap is much greater than that of the magnetically conductive material. As the magnetic field passes through the air gap, it diffuses, causing some magnetic lines of force to escape. Second, if the magnetic permeability of the magnetic circuit material is not high enough, the magnetic lines of force tend to seek paths with lower magnetic resistance, causing some magnetic lines of force to escape. The resulting leakage magnetic field can attract ferromagnetic materials such as iron, nickel, cobalt, and their alloys.

[0057] Preferably, the liquid inlet 101 faces the electromagnetic vibrator.

[0058] The metalworking fluid and the impurities therein entering through the liquid inlet 101 first flow to the vicinity of the electromagnetic vibrator, where the ferromagnetic impurities therein are adsorbed, while further preventing the cylindrical filter screen 300 from being directly impacted and damaged.

[0059] The axes of the liquid inlet 101 and the liquid outlet 102 are both horizontal and collinear, and both ends are provided with connecting flanges. The axis of the cylindrical filter screen 300 is perpendicular to the axes of the liquid inlet 101 and the liquid outlet 102.

[0060] Preferably, a spherical shell 310 is rotatably provided in the collection chamber 303, and a material port 311 is opened on the spherical shell 310. The spherical shell 310 can rotate between a first position and a second position. When in the first position, the material port 311 faces the opening to collect impurities in the metalworking fluid. When in the second position, the material port 311 faces away from the outlet to discharge the impurities collected in the metalworking fluid.

[0061] Since the metalworking fluid centralized filtration system usually has a heavy workload and a long continuous working time, the collection or discharge of impurities is controlled by controlling the rotation of the spherical shell 310 between the first position and the second position, without deliberately controlling the filtration equipment to stop, thereby achieving non-stop cleaning of impurities.

[0062] In fact, the collection chamber 303 is only used to set the spherical shell 310 itself, and the cavity inside the spherical shell 310 plays the role of collecting impurities. The outer surface of the spherical shell 310 is evenly spaced with multiple sealing rings 312 to achieve a rotating sealed connection between the spherical shell 310 and the collection chamber 303. Figure 3 、 Figure 5 The axis of rotation of the spherical shell 310 is located at the center of the spherical shell 310, and a rotating shaft can be provided to support the rotation of the spherical shell 310.

[0063] Among them, see Figure 3 When filtering metalworking fluid, the inlet 311 of spherical shell 310 faces upward, that is, spherical shell 310 is in the first position, to collect impurities in the metalworking fluid. During the filtration process, the lower end of path b is blocked by spherical shell 310, while path a is maintained open by first chamber 301, second chamber 302, and liquid outlet 102. Therefore, the metalworking fluid tends to flow along the path with less resistance, that is, the metalworking fluid mainly flows along path a. Impurities, under the influence of their own gravity, mainly flow along path b and are collected in spherical shell 310.

[0064] Preferably, see Figure 5 、 Figure 6 The outer surface of the spherical shell 310 is provided with a plurality of blind holes 313 at equal intervals along its circumference, and the axes of the plurality of blind holes 313 and the axis of the material port 311 are located in the same vertical plane.

[0065] By inserting a specific tool such as a crowbar into the blind hole 313 and rotating the crowbar to rotate the ball shell 310, the ball shell 310 is rotated between the first position and the second position, changing the direction of the material opening 311, and facilitating operation.

[0066] The collection chamber 303 has openings at both ends. The opening at the upper end is connected to the cylinder 305, the liquid inlet 101 and the first chamber 301, and the opening at the lower end is connected to the external environment, which is convenient for inserting specific tools such as crowbars.

[0067] Of course, other driving structures can also be provided to rotate the ball shell 310. For example, a rotatable hand wheel or a wrench can be provided to directly drive the ball shell 310 to rotate, similar to the switch structure of a ball valve or the like.

[0068] An embodiment of the present invention further provides a metalworking fluid filtration process, comprising the following steps:

[0069] Allow metalworking fluids containing impurities to settle;

[0070] The supernatant after sedimentation is introduced into a pre-filtration unit for pre-filtration to obtain a pre-filtered liquid;

[0071] The pre-filtered liquid is introduced into the housing 100 through the liquid inlet 101. The pre-filtered liquid passes through the cylindrical filter 300 from the first chamber 301 and enters the second chamber 302 to obtain the refined filtered liquid which is discharged from the liquid outlet 102. Impurities are collected by sinking from the first chamber 301 to the collection chamber 303.

[0072] The fine filtrate is ultrasonically sterilized, and the pH value and concentration of the fine filtrate are adjusted to the target range.

[0073] Among them, the static sedimentation time can be 0.5 to 3 hours. The pre-filtration unit can adopt a bag filter with a self-cleaning function, and the backwash pressure is ≥0.3Mpa. The filter material accuracy of the pre-filtration unit is greater than the filter material accuracy of the cylindrical filter 300. The frequency of ultrasonic sterilization can be 15 to 40kHz, and the sterilization time can be 30 to 120 minutes. The target pH range of the fine filtrate can be 8.2 to 9.5, and the target concentration range can be 3% to 12%. Of course, other processes can also be added between the above steps to improve the recovery quality of the metalworking fluid.

[0074] The machine tool is equipped with a liquid return device, which is sequentially connected to a pre-filtration unit and housing 100 to perform pre-filtration and fine filtration. The liquid outlet 102 of housing 100 is connected to the liquid inlet of a liquid supply pump assembly, which can also be connected to a liquid storage tank. The liquid outlet of the liquid supply pump assembly is connected to a liquid supply pipeline to supply liquid for the metalworking process of the machine tool. The above-mentioned configuration of the metalworking fluid and the machine tool is conventional and will not be described in detail here.

[0075] When the metalworking fluid filtering device of the present invention is used, after the pre-filtered liquid, i.e., the metalworking fluid containing impurities, is introduced into the housing 100 through the liquid inlet 101, the metalworking fluid containing impurities enters the cylinder 305 and rises to the first chamber 301 in the cylindrical filter 300. Under the action of liquid pressure, it passes through the cylindrical filter 300 and flows to the second chamber 302, and is discharged from the liquid outlet 102, completing the filtering process. The flow direction of the metalworking fluid is as follows: Figure 3 Middle a path.

[0076] Waste chips and other impurities in the metalworking fluid are filtered by the cylindrical filter 300 and remain in the first chamber 301. They sink under the action of gravity and enter the collection chamber 303 through the second leakage hole 204 and the first leakage hole 203 to be collected. The flow direction of the impurities is as follows: Figure 3 Path b. Impurities collected in the collection chamber 303 can be periodically discharged by inserting a specific tool, such as a crowbar, into the blind hole 313 and rotating the crowbar to rotate the ball shell 310 from the first position to the second position, with the material port 311 facing downward to discharge the collected impurities. This eliminates the need to intentionally shut down the filtering equipment, thereby achieving non-stop impurity cleaning.

[0077] During the above-mentioned filtering process, the vibration device 200, i.e., the electromagnetic vibrator, is in operation, and the output end of the vibration device 200 drives the coil spring 304 to vibrate axially and reciprocally as a whole, so that the cylindrical filter screen 300 vibrates axially and reciprocally. At the same time, the coil spring 304 is locally deformed to perform axial reciprocating expansion and contraction, so that the cylindrical filter screen 300 is axially and reciprocatingly expanded and contracted along its corrugated structure, so as to more efficiently remove impurities attached to the cylindrical filter screen 300, reduce the probability of clogging, and avoid affecting the filtering effect and equipment operation. At the same time, the closer the electromagnetic vibrator is to the lower side of the cylindrical filter screen 300, the greater the vibration amplitude and the better the vibration effect. This solves the problem of high filtration pressure and poor filtration effect caused by the accumulation of impurities on the lower side of the cylindrical filter screen 300, and reduces the probability of clogging of the cylindrical filter screen 300.

[0078] At the same time, when impacted by the metalworking fluid and the impurities therein, the cylindrical filter 300 deforms to provide a cushioning effect, preventing damage to the cylindrical filter 300. Furthermore, the metalworking fluid first flows to the vicinity of the electromagnetic vibrator, where ferromagnetic impurities are attracted by the leakage magnetic field generated by the electromagnetic vibrator. This reduces the probability of ferromagnetic impurities entering the cylindrical filter 300, thereby reducing the probability of clogging the cylindrical filter 300 and further preventing damage to the cylindrical filter 300 from direct impact. The adsorbed ferromagnetic impurities are then vibrated off by the electromagnetic vibrator and collected in the collection chamber 303 under the influence of gravity.

[0079] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A metalworking fluid filtering device, characterized in that: The invention comprises a housing and a vibration device, wherein a liquid inlet and a liquid outlet are respectively formed on two sides of the housing, a cylindrical filter screen with a vertical axis is provided in the housing, an opening is formed at the lower end of the cylindrical filter screen, a first chamber is formed in the cylindrical filter screen, the liquid inlet is communicated with the first chamber through the opening, a second chamber is formed between the cylindrical filter screen and the housing, and the second chamber is communicated with the liquid outlet, a collection chamber is formed on the housing and is located below the cylindrical filter screen, and the collection chamber is used to collect impurities in the metalworking fluid; the vibration device is disposed in the housing and is used to vibrate the cylindrical filter screen; A coil spring is provided in the cylindrical filter screen, and the circumferential surface of the cylindrical filter screen is bent in sequence along the trajectory of the coil spring to form a spiral corrugated structure. The upper end of the coil spring is connected to the shell, and the lower end of the coil spring is connected to the output end of the vibration device. The vibration device causes the cylindrical filter screen to vibrate axially and reciprocatingly through the coil spring; a screw is threadedly connected to the shell, and the end of the screw extends into the second chamber and is provided with a pressure plate, the upper end of the coil spring is connected to the pressure plate, and the vibration device is an electromagnetic vibrator. When the electromagnetic vibrator is in operation, a leakage magnetic field is generated around it to absorb ferromagnetic impurities in the metalworking fluid, and the liquid inlet faces the electromagnetic vibrator.

2. The metalworking fluid filtering equipment according to claim 1, characterized in that: An inclined surface is formed on the inner surface of the coil spring, and the inclined surface is inclined from top to bottom and from outside to inside.

3. The metalworking fluid filtering equipment according to claim 1, characterized in that: The outer surface of the coil spring is a curved surface.

4. The metalworking fluid filtering equipment according to claim 1, characterized in that: A spherical shell is rotatably provided in the collection chamber, and a material port is provided on the spherical shell. The spherical shell can rotate between a first position and a second position. When in the first position, the material port faces the opening to collect impurities in the metalworking fluid. When in the second position, the material port faces away from the opening to discharge the impurities collected in the metalworking fluid.

5. The metalworking fluid filtering equipment according to claim 4, characterized in that: The outer surface of the spherical shell is provided with a plurality of blind holes at equal intervals along its circumference, and the axes of the plurality of blind holes and the axis of the material port are located on the same vertical plane.

6. A metalworking fluid filtration process, using the metalworking fluid filtration equipment according to any one of claims 1 to 5, characterized in that: The following steps are involved: Allow metalworking fluids containing impurities to settle; The supernatant after sedimentation is introduced into a pre-filtration unit for pre-filtration to obtain a pre-filtered liquid; The pre-filtered liquid is introduced into the housing from the liquid inlet, and the pre-filtered liquid passes through the cylindrical filter screen from the first chamber into the second chamber to obtain the fine filtered liquid which is discharged from the liquid outlet. Impurities sink from the first chamber to the collection chamber and are collected. The fine filtrate is ultrasonically sterilized, and the pH value and concentration of the fine filtrate are adjusted to the target range.

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