KR100967712B1 - Magnetic Filter For Recycling the Roll Milling Oil - Google Patents

Abstract

An object of the present invention is to provide an electromagnetic filter for recirculating hot rolled oil, which is capable of achieving smooth purification of rolled oil and perfect collection of iron-based fine particles by designing a cartridge type filter mesh and properly constructing a magnetic / nonmagnetic mesh. There is this.

Accordingly, the present invention provides a hexahedral filter case configured to be easily attached to or removed from the inner space of the main body case of the electromagnetic filter, a stainless mesh installed on the inner wall of the filter case, a thick carbon steel mesh net repeatedly stacked between the stainless meshes, and a thin permalloy. Including the mesh net, it is magnetized by the magnetic flux passing between the pole pieces of the left and right yoke is installed in the inner space of the main body case to filter the iron-based fine particles contained in the rolling oil flowing from the lower chamber to the upper chamber side It provides an electromagnetic filter for rolling oil circulation purification, comprising a filter unit.

Yoke, chamber, filter case, carbon steel mesh net, permalloy mesh net

Description

Magnetic Filter for Recycling the Roll Milling Oil

1 is a perspective view showing an electromagnetic filter for rolling oil circulation purification according to the present invention;

Figure 2 is a cross-sectional view showing an electromagnetic filter for rolling oil circulation purification according to the present invention,

3A and 3B are a perspective view and a sectional view showing a filter unit employed in the electromagnetic filter for rolling oil circulation purification according to the present invention;

4 is a view showing the inside of the filter mesh net showing the actual of FIG. 3 according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic filter used to circulate and purify rolling oil, and more particularly, to rolling oil by a mesh filter which is easily magnetized by high magnetic fields in the course of circulating reuse of rolling oil (mainly lubricating oil) used in steel rolling processes. The present invention relates to an electromagnetic filter for rolling oil circulation purification which improves the surface quality of a steel sheet and reduces the amount of rolling oil used by filtering various iron-based fine particles contained therein.

Iron-based fine particles of several hundred microns or less are suspended in the rolled oil and cannot be completely filtered by a general filtration device. Accordingly, in order to circulate and reuse the collected rolled oil, a separate filtration device must be installed between the existing Hoffman filter and the rolling mill to remove only fine iron-based fine particles that have not been removed using physical properties such as high magnetic force. do.

A technique using a high gradient magnetic filter that filters and removes iron-based foreign substances to improve water quality or to recycle water in industrial water circulation has been identified academically since the 1975s (C.de). Lauter and H. Kolm, IEEE Trans.on Magn., MAG-11 (5), 1975, p. 1570 and JA Oberteuffer.I. Wechaler and NJ McNallan, IEEE Trans.on Magn., MAG-11 (5), 1975, p. 1591). Since then, in the laboratory, based on the results of many studies on its efficiency, it began to be used ten years later.

A device that performs filtration of iron-based particles of rolled oil by winding a solenoid coil, which is an electromagnet, generally around a pipe through which fluid flows, and generating a magnetic field (US Pat. No. 4,279,748 1981, Japanese Patent No. 60-179109, 1985) ) And a rotary magnetic separator (US Pat. No. 4,445,228, 1984) capable of filtering the iron-based particles contained in the rolled oil by classifying them by magnetic properties such as desired particles in the fluid.

However, the rotary filtration device of such a conventional filtration device is limited in the design technology of the electromagnetic (electromagnetic), which is a device for generating a magnetic field which is the core principle of the magnetic filter, the size of the electromagnet is inefficiently enlarged to obtain a high magnetic field In the case of a filtration device having a solenoid coil-like electromagnet type, there was a problem in that the installation structure of the electromagnet was simple, but high magnetic field force was not generated, and thus the filtration efficiency was low.

In order to solve the problems of the prior art, Korean patents (Patent Application No. 2000-38698, Patent Application No. 2001-0063394) have a device for generating a high magnetic field and smooth circulation of the rolling oil, back washing technology (back washing) And the like.

However, the conventional technology also has a specific design technology of the filter mesh is not perfect, the performance of the filter is rapidly dropped with time due to the problem of sticking on the side of the wall due to the magnetization of the iron-based particles accumulated in the filter after using the filter for a certain time.

Accordingly, the present invention has been made to solve the above problems, by designing a filter (cartridge) filter mesh, by properly configuring the magnetic / non-magnetic mesh to achieve a smooth collection of rolling oil and a perfect collection of iron-based fine particles at the same time It is an object of the present invention to provide an electromagnetic filter for recycling doped oil recirculation.

Another object of the present invention is to simplify maintenance and extend the service life, while maximizing the filtration efficiency of the rolling oil circulated rolling oil recirculation electromagnetic filter that can extend the use time of the circulating oil circulating purification electromagnetic filter indefinitely. In providing.

The present invention to achieve the above object,

In the storage tank for storing the rolled oil used in the steel sheet rolling process of the rolling equipment, the apparatus for filtering the iron-based particulate matter between the Hoffman filter and the cleaning tank to remove the foreign matter contained in the rolling oil,

A hollow body case in which the lower chamber into which the rolling oil flows in, and the upper chamber through which the rolling oil is discharged through the cleaning tank and the outflow line are disposed in communication;

The left and right yokes, in which end portions are in contact with both left and right sides of the hollow body case, and coils of a predetermined amount are wound so that magnetic flux can be passed in a direction crossing the extension line between the upper and lower chambers when power is applied. ,

It includes a filter unit which is installed in the inner space of the main body case to be filtered by the magnetic flux passing between the left and right yoke, the iron-based fine particles contained in the rolling oil flowing from the lower chamber to the upper chamber side,

The filter unit repeatedly supports a nonmagnetic filter case for support in the form of a cartridge installed between the pole pieces of the left and right yokes, and an ultra low carbon steel mesh net and permalloy mesh net that enters the filter case and has good magnetization sensitivity. Layered filter meshes.

Here, the permalloy mesh net is composed of a wire made of iron-nickel (Ni; 42 to 80 wt%) of a diameter of 0.5 to 2 mm in thickness, and the ultra low carbon steel mesh net is extremely low of 1.0 to 2.0 mm in diameter. Made of carbon steel wire material.

In addition, the mesh net is preferably laminated repeatedly in the filter case between the pole pieces so as to be parallel to the flow of the rolling oil.

In addition, it is preferable that the filter part distributes the support nonmagnetic stainless steel mesh closer to the pole piece side on the inner wall of the filter case between the pole pieces.

In addition, the filter unit may further include a magnetic induction sensor that frequently detects a change in the magnetic susceptibility that changes as the deposition amount of the iron-based particulate matter filtered by a long time filtration increases.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing an electromagnetic filter for rolling oil circulation purification according to the present invention, Figure 2 is a cross-sectional view showing an electromagnetic filter for rolling oil circulation purification according to the present invention, Figure 3 (a), (b) is in accordance with the present invention A plan view, a side view, and a perspective view showing a filter portion employed in an electromagnetic filter for rolling oil circulation purification.

According to the drawings, the main body case 10 is connected to each other via the inlet line (2a), the lower chamber (30b) and the outflow line (2a) is introduced into the rolling oil in which the first coarse foreign matter filtered ) Is in communication with each other, the upper chamber 30a for discharging the filtered rolling oil is discharged while passing through the main body case 10, respectively, and is opened to the interview portion freely so that the rolling oil can flow in one direction. It is.

The inflow and outflow lines 2a and 2b are provided with valve members 3a and 3b, respectively, to properly control the flow of the rolling oil.

In addition, the first and second yokes 21 and 22 which generate a magnetic flux of a constant intensity when the power is applied, the pole pieces which are end portions on both the left and right sides of the hollow body case 10 are in contact with each other, and the yoke core 25 Position is fixed. In addition, a predetermined amount of coils 23 and 24 are wound around the bodies of the first and second yokes 21 and 22 so as to form magnetic flux in a direction transverse to the direction in which rolling oil flows when an external power source is applied. have.

Here, the yoke core 25 is made of an electrical steel sheet so as to minimize the electrical energy loss, and the first and second yokes 21 having end portions contacting the outer surfaces of the body case to minimize the outflow of magnetic flux. 22) is made of ultra-low carbon steel material to maximize the tube rate and maximize the concentration of magnetic flux.

On the other hand, the filter unit is magnetized by the magnetic flux passing between the first and second yoke 21, 22 when the power is applied to the internal space of the main body case 10 to filter the iron-based fine particles contained in the rolling oil Is installed on.

This filter part is a hexahedral filter case 12 configured to be easily attached to and detached from the chamber of the main body case, and a non-magnetic stainless steel for support provided on the inner wall 31a and 31b side of the filter case and disposed near the pole piece. The mesh 34 includes a thick carbon steel mesh net 33 and a thin permalloy mesh net 32 repeatedly stacked inside the filter case.

The stainless mesh 34 has a magnetic field generated while the external magnetic field is loaded on the filter case 12, and the fine powder contained in the rolling oil concentrates on the inner wall side of the case to block the flow of the rolling oil. It is to prevent the phenomenon.

Therefore, in the case of the mesh directly contacting the inner walls 31a and 31b of the filter case, the stainless mesh 34 is used.                     

Here, the mesh nets 32 and 33 of the filter unit are arranged side by side in the same longitudinal direction as the flow of the rolling oil flowing to the lower and upper chambers.

That is, the laying directions of the mesh nets 32 and 33 positioned inside the filter are placed in a bookshelf in a direction parallel to the direction in which the rolling oil flows, and the magnetic flux passes in the transverse direction. At this time, the chamber wall of the main body case which is in contact with the first and second yokes 21 and 22 does not allow magnetic flux to pass through the wall, but instead transmits the magnetic flux through the chamber wall at right angles to the flow direction flowing with the flow rate. The effect of filtering should be great. Therefore, the chamber wall must be made of non-magnetic (stainless) material.

In addition, the mesh net (mdsh net) 32, 33 is excellent in corrosion resistance to the rolling oil, its service life is long, its magnetic tube rate is large, it is easily due to the magnetic flux flowing between the first and second yoke (21, 22) The diameter of the carbon steel wire constituting the mesh nets (32, 33) composed of an iron-nickel-based alloy (42 wt.% To 80 wt.%) To magnetize the iron-based fine particles contained in the rolling oil to be completely removed. Silver 1.0-2.0 mm, permalloy wire diameter is suitable 0.5-2.0 mm.

The volume fraction of the carbon steel wire and permalloy wire of the mesh net can be controlled by controlling the number of the nets. Carbon steel wire uses galvanized wire to retain corrosion resistance to rolled oil.

The volume fraction of the carbon steel mesh net and permalloy net depends on the conditions of use of the rolling oil, but if it is necessary to remove fine particles of 10 micrometer particle size, the volume fraction of the carbon steel mesh net is 60-70%. To allow somewhat coarse particles (20-30 micrometer particle size), if the smooth flow of the rolling oil is more important, it is preferable to set the volume fraction of the permalloy mesh net to 60-70%.

The operation of the present invention having the configuration as described above will be described.

First, the rolling oil used in the rolling equipment becomes coarse foreign substances of several hundred microns or more while continuously passing through the storage tank and the Hoffman filter in order to recycle, but iron-based fine particles having a size of less than that are contained in the rolling oil.

The rolling oil having such iron-based fine particles flows into the lower chamber 30b through the inflow line and flows out to the upper chamber 30a through the filter part accommodated in the chamber of the main body case.

The coils 23 and 24 wound on the first and second yokes 21 and 22 while the oil flowing through the filter unit through the upper chambers 30a and 30b are in communication with the outer circumferential surface of the main body case. When the external power is applied to each side, the magnetic flux generated in the first and second yokes flows perpendicularly to the flow of the rolling oil, and strongly magnetizes the mesh nets 32 and 33 inside the filter unit located between the pole pieces. Let's go.

In this case, the mesh net is placed at a level with the flow of the flow velocity, which does not cause any problem in the normal flow of the rolling oil.

Meanwhile, as the rolling oil passes through the gap between the mesh net and the net, the iron-based fine particles are attached to the strongly magnetized mesh nets 32 and 33, and the remaining rolling oil is reused through the upper chamber 30a as a cleaning tank. Supplied.                     

On the other hand, the mesh net constituting the filter inside the magnetic induction sensor (39) for detecting a change in the magnetic susceptibility (variable) as the deposition amount of the iron-based particulate matter filtered due to the long time filtration action of the filter portion increases Equipped with.

Therefore, when a certain amount of foreign matter is deposited on the mesh net of the filter unit and detected by the magnetic induction sensor, and the potato rate reaches a preset value, the back washing and maintenance time for the filter unit is detected and notified to the worker. do.

That is, when it is desired to backwash the filter unit as the backwashing fluid based on the detection value of the magnetic induction sensor 39, the power supply to the first and second yokes 21 and 22 is cut off so that the mesh net of the filter unit ( 32,33) in the state of the loss of magnetic force, the expansion operation during the filtration operation to widen the gap between the mesh net of the filter portion to facilitate backwashing and desorption of the attached foreign matter, the magnetic field is loaded during the operation of the filter, the fine particles of iron-based Is attached to the mesh net to maximize the effect of filtration.

At this time, when the outer wall of the filter body case chamber is a magnetic material (conductive steel material), the iron-based fine particles are locally accumulated on the wall contacting with the yoke and are changed into a solid state, thereby ultimately blocking the gap of the filter mesh. Therefore, it must be made of a metal material such as a non-magnetic material (stainless steel) to exert the effect of penetrating into the whole filter without disturbing the magnetic flux from the yoke that supplies the magnetic flux in the transverse direction from the left and right sides.

In addition, the choice of materials is important for the mesh net material such as increased corrosion resistance from the rolling oil, mechanical strength, susceptibility magnetized from an external magnetic field, and low cost of the material.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to know that those who have knowledge of this can easily know.

According to the electromagnetic filter for recycling the rolled oil according to the present invention as described above, the magnetized fine particles contained in the rolled oil can be filtered by passing the magnetic flux in a direction crossing the rolled oil flowing in one direction to magnetize the rolled oil. It is possible to increase the filtration efficiency of and to extend the service life of the rolled oil.

In addition, since the filter unit can be easily replaced with a prefabricated cartridge type, the operator can easily perform maintenance and maintenance work, and the cleaning magnetization program is automated by the program to change the magnetization ability as the iron particles are filtered and deposited. By automatically performing the rolling oil filtration operation, the effect of remarkably improving the workability of the operator can be obtained.

Claims (4)

In the storage tank for storing the rolled oil used in the steel sheet rolling process of the rolling equipment, the apparatus for filtering the iron-based particulate matter between the Hoffman filter and the cleaning tank to remove the foreign matter contained in the rolling oil, A hollow body case in which the lower chamber into which the rolling oil flows in, and the upper chamber through which the rolling oil is discharged through the cleaning tank and the outflow line are disposed in communication; The left and right yokes, in which the ends are in contact with both left and right sides of the hollow body case and a coil is wound in a predetermined amount so that magnetic flux can be passed in a direction crossing the extension line between the upper and lower chambers when the power is applied. The seat including a hexahedral filter case configured to be easily attached to and detached from the inner space of the main body case, a stainless mesh installed on an inner wall of the filter case, a carbon steel mesh net and a permalloy mesh net repeatedly stacked between the stainless meshes, And a filter unit installed in the inner space of the main body case so as to filter the iron-based fine particles contained in the rolling oil that is magnetized by the magnetic flux passing between the pole pieces of the right yoke and flows from the lower chamber to the upper chamber side. Electromagnetic filter for rolling oil circulation purification, characterized in that it comprises a. The method of claim 1, wherein the permalloy mesh net is composed of iron-nickel (Ni; 42 to 80% by weight) wire having a diameter of 0.5 to 2 mm, the carbon steel mesh net is a very low carbon steel 1.0 to 2.0 mm in diameter Electromagnetic filter for rolling oil circulation purification, characterized in that consisting of a wire. The rolling oil circulation according to claim 1 or 2, wherein the volume fraction of the carbon steel mesh net and the permalloy net sets the volume fraction of the carbon steel mesh net to 60-70% when removing fine particles having a particle size of 10 micrometers. Purification electromagnetic filter. The rolling oil of claim 1, wherein the filter part further comprises a magnetic induction sensor that frequently detects a change in the magnetic susceptibility, which varies as the deposition amount of the iron-based particulate matter filtered by a long time filtration action increases. Electromagnetic filter for circulating purification.

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