KR102144236B1 - Device for displaying magnetic flux density of electromagnetic filter system - Google Patents

Abstract

Provided is a device for displaying the gauss of an electromagnet of an electromagnetic separator to measure and display magnetic flux density that is formed in the electromagnet to easily set a filtering state of an electromagnetic filter of the electromagnetic separator. According to the present invention, the device comprises: a housing having a bore perforated in the center thereof, having a coil wound around the periphery thereof with respect to the bore, and having coolant stored therein; the electromagnetic filter inserted into the bore and including a matrix filter which absorbs and filters foreign matter of a magnetic material included in a raw material supplied to the bore when current flows in the coil; a power conversion device responding to a voltage control signal to convert alternating current (AC) voltage into direct current (DC) power and supply the DC power to both ends of the coil; a power monitor using a voltage applied to a shunt resistor connected between an input terminal of the AC voltage and a power terminal of the power conversion device to measure a consumption current, which is a current flowing in the coil, of the electromagnetic filter; and a control unit including a memory storing length information of the matrix filter of the electromagnetic filter, a reference electromagnet magnetic flux density value, and a resistance value of the shunt resistor. When the AC voltage is supplied to the power conversion device, the control unit supplies the voltage control signal to the power conversion device, uses the current value measured in the power monitor to calculate a magnetic flux density B by a mathematical formula, B = (μ x N x I) / d (wb/m^2), thereby finding and displaying the magnetic flux density of the electromagnetic filter on a touch screen.

Description

Electromagnet Gaussian display device of electromagnet iron removal machine TECHNICAL FIELD [Device for displaying magnetic flux density of electromagnetic filter system]

The present invention relates to an electromagnet filter system (electromagnetic filter system), and more specifically, a magnetic flux density (B) formed in an electromagnet in order to easily set a filtering state of an electromagnet filter in an electromagnet detacher. ) Is measured and displayed, and the magnetic flux density is kept constant even though the temperature of the coil increases due to long-term operation. The present invention relates to an electromagnet Gaussian display device of an electromagnet stripper.

The electromagnet filter system refers to a system that absorbs and extracts iron contained in minerals and separates them from minerals. Such an electromagnet filter system is also referred to as an electromagnet de-iron or a magnetic filter.

Various minerals are used in the electric and electronic industries that manufacture batteries and electric and electronic products that we use widely, the ceramic industry that uses clay minerals, and the semiconductor industry. In this industrial field, when iron is mixed in minerals, it causes quality deterioration, so only materials that exclude iron as much as possible can be used to produce safe and efficient products.

As an example of the most representative industry, there is a battery industry. In the secondary battery, electrodes of a positive electrode and a negative electrode are formed, and in order to manufacture such an electrode, an electrode active material must be applied to the electrode. Examples of the electrode active material include lithium or manganese-containing composite metal oxides such as LiCoO ₂ , LiNiO ₂ , LiMnO ₂ , LiMn ₂ O ₄ , LiFeVO ₄ , and LixNiyCozMnwO ₂ .

In order to obtain the above electrode active material, it must be separated from minerals such as petalite containing lithium, iron meteorite containing cobalt, and manganese containing iron and manganese. However, when an electrode material such as lithium, cobalt, and manganese from the separated mineral contains an iron component, an efficient slurry for coating an electrode plate cannot be properly made.

As an example of an apparatus for removing iron content contained in minerals for making a slurry for secondary battery electrodes, it is common to use an electromagnet filter (de-ironing machine). An example of such a de-ironing machine is Patent No. 2016875 (registered on Aug. 26, 2019), which the applicant of the present application patented, "Automatic de-ironing system for refining raw materials for secondary batteries".

The electromagnet stripper described in the above patent document is put in the center of the coil bobbin or the bore of the coil to screen foreign substances such as iron in different ways depending on the type of raw material for removing foreign substances. The rod-shaped magnetic filter (also referred to as a screen filter or matrix filter in the art) can be replaced. The types of magnetic filters have various structures, such as a matrix, a net, or a mesh net.

The electromagnet magnetic flux density of the electromagnet stripper is required to be 1 Tesla (1 Wb/m ² ). Tesla is the MKS unit system, and the field uses the CGS unit system, so the magnetic flux density is set to 10,000 gauss (G).

The electromagnet filter according to the prior art has a configuration in which a rod-shaped screen (matrix filter) is put in the bore of the coil, and the electric resistance of the coil decreases as the temperature of the coil increases due to continuous operation. The current increases and the magnetic flux density changes.

For example, even if the electromagnet filter was operated with the electric flux density set to 10,000G during the initial operation, there is a problem in that the magnetic flux density increases as a large amount of current flows due to a decrease in the coil resistance value due to continuous operation.

In this case, the system operator must adjust the magnetic flux density of the electromagnet by adjusting the voltage and current input to the electromagnet. However, the conventional electromagnet filter is not equipped with a device for displaying the magnetic flux density of the electromagnet, so a person without much driving experience cannot easily adjust the magnetic flux density of the electromagnet.

10-2016875 B1 (2019.08.26.)

Therefore, the present invention has been devised to solve the above problems, and when power is applied in an electromagnet de-ironing machine that attaches and removes foreign substances of a magnetic material such as iron contained in raw materials used for manufacturing products in a specific industry, It is to provide a magnetic flux density display device of an electromagnet filter that can measure the magnetic flux density and display it in an MKS or CGS unit system.

Another object of the present invention is to provide an apparatus for operating an electromagnet filter system that maintains a constant magnetic flux density of an electromagnet filter even when the electromagnet stripper is operated for a long time.

The present invention for achieving the above object is a housing in which a through bore is formed in the center, a coil is wound around the bore based on the bore, and a cooling liquid is accommodated therein, and is inserted into the bore. An electromagnet filter comprising a matrix filter configured to absorb and filter foreign substances contained in the raw material supplied to the bore while current is flowing through the coil; A switching mode power supply (SMPS) for converting an AC voltage to DC in response to a voltage control signal and providing it to both ends of the coil; A power monitor measuring current consumption of the electromagnet filter, that is, a current flowing through the coil by using a voltage applied to a shunt resistor connected between the input terminal of the AC voltage and the power terminal of the power conversion device; And a memory storing matrix filter length information of the electromagnet filter, winding (number) information of the coil 12, and an electromagnet reference magnetic flux density value, and when the AC voltage is supplied to the power conversion device, the voltage control signal is The magnetic flux of the electromagnet filter is supplied to a power conversion device, and the magnetic flux density B is calculated using the equation "B = (μ·N·I)/d [wb/㎡]" using the current value measured by the power monitor. It characterized in that it comprises a control unit to determine the density and display it on the touch screen.

In the above equation, μ is the permeability of the matrix filter, N is the number of windings of the coil, I is the current flowing through the coil, and d is the length of the matrix filter (electromagnet).

The control unit converts the magnetic flux density value of the MKS (meter, kilogram second) unit system calculated by the equation into Gauss, which is a value of the centimeter, gram second (CGS) unit system, and displays it on the touch screen. .

The control unit converts a voltage control signal for adjusting an output of the power conversion device when a comparison value of the calculated magnetic flux density value and the electromagnet reference magnetic flux density value stored in the memory exceeds a preset tolerance. do.

The power monitor includes a shunt resistor connected between the input terminal of the AC voltage and a power terminal of the power conversion device, and a voltmeter connected in parallel to the shunt resistor to measure a voltage drop between both terminals of the shunt resistor, The voltage value measured by the voltmeter is converted into a digital signal and is provided with an analog-to-digital converter.

The control unit is characterized in that the current flowing through the coil is measured according to Ohm's Law based on the value of the shunt resistance and the voltage output from the voltmeter.

As described above, in the present invention, the magnetic flux density value of the electromagnet which is proportional to the current flowing through the coil constituting the electromagnet is calculated and displayed by detecting the current flowing through the coil. Since the value of can be easily monitored, it is possible to precisely operate the electromagnet stripper. In addition, when the magnetic flux density of the electromagnet exceeds the value of the set magnetic flux density, the magnetic flux density of the electromagnet filter can always be operated within a certain range by automatically adjusting the output of the power converter supplying a driving voltage to the coil constituting the electromagnet. .

1 is a schematic diagram of a magnetic flux density display device of an electromagnet de-ironing machine according to a preferred embodiment of the present invention.
FIG. 2 is a flow diagram of a magnetic flux density measurement and display control procedure of the controller illustrated in FIG. 1.
3 is an exemplary view of the touch screen shown in FIG. 1.

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

Since the present invention can apply various transformations and have various embodiments, the best embodiments will be described in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all conversions, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the present invention, when it is determined that a detailed description of a related known technology may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

Referring to FIG. 1, an electromagnet de-ironing machine 1 according to the present invention includes an electromagnet filter 10 and a control circuit 20 for driving and controlling the electromagnet filter 10.

The filter elements constituting the electromagnet filter 10 are contained in a housing 11 made of non-magnetic stainless steel. The housing 11 has a bore bR formed at the center thereof, and a coil 12 is wound around the bore bR to form a coil member. Since the number of turns of the coil 12 closely affects the magnetic flux density of the electromagnet filter 10, it must be properly wound according to the design of the required magnetic flux density.

The inside of the housing 11 in which the coil 12 is wound is filled with a cooling liquid for cooling heat generated when an electric current flows through the coil 12. For example, cooling oil or the like can be considered. The cooling oil is cooled by a chiller, and the cooled cooling oil is circulated into the housing 11 through an oil cooler and a circulation pump.

A canister 13 made of non-magnetic stainless steel is inserted into the bore bR penetrated up and down in the center of the housing 11, and a magnetic matrix or various shapes inside the canister 13 A matrix filter (or screen) 14 of a predetermined length (d) made in a shape of a heart is inserted to constitute an electromagnet.

In the above configuration, when a current flows through both ends of the coil 11 wound in an annular shape, magnetic force is generated in the matrix filter 14 located at the center of the coil 11 as already known. The magnetic flux density B generated by the matrix filter 14 is shown in Equation 1 below.

[Equation 1]

B = (μ·N·I)/d [wb/㎡]

In Equation 1, μ is the magnetic permeability of the matrix filter, N is the number of turns of the coil, I is the current flowing through the coil, and d is the length (electromagnet) of the matrix filter.

The electromagnet filter 10 configured as described above is driven by the control of an AC voltage AC and a control circuit 20 connected to both ends of the coil 11 of the electromagnet filter 10.

The control circuit 20 has a power switch (Ps) and a shunt resistor 31 connected in series to one side of the AC voltage 10 and one terminal of the power conversion device 21, and the AC voltage 10 ) And the other terminal of the power converter 21 are directly connected.

At this time, the connection node of the power switch Ps and the shunt resistor 31 and the other terminal of the AC voltage are connected to the control unit 40.

A power monitor 35 is connected to both terminals of the shunt resistor 31. The power monitor 35 includes a volt meter 32 connected in parallel to the shunt resistor 31 and an analog to digital converter (ADC) that converts the output of the volt meter 32 into a digital signal ( 33).

The power monitor 35 is for measuring the current flowing through the coil 12, which is a load of the electronic circuit 20, and the shunt resistor 31 includes one side of the coil 11 and a power conversion device ( 21) may be connected between the output nodes.

The control unit 40 includes a power supply unit 41 that rectifies the AC voltage AC to output an operating voltage, length information of the matrix filter 14 of the electromagnet filter 10, and the winding of the coil 12 (the number of detections). ) Information, a memory 42 storing information such as an electromagnet reference magnetic flux density value (Bref), and a voltage control signal VCTL to the voltage conversion circuit 21 by being operated by the operating voltage of the power supply unit 41 A controller 43 that calculates the magnetic flux density B of the electromagnet filter 10 using the digital signal output from the power monitor 35 and the information stored in the memory 42 and displays it through the touch screen 50 ).

FIG. 2 is a flowchart illustrating a procedure for measuring and displaying a magnetic flux density of the controller illustrated in FIG. 1, and FIG. 3 is a diagram illustrating an exemplary display of the touch screen illustrated in FIG. 1.

The operation of the electromagnet iron removal machine 1 according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

When the user turns on the power switch Ps, the AC voltage AC is inputted to the control circuit 40 and at the same time inputted to the power conversion circuit 21 through the shunt resistor 31.

The power supply unit 41 in the control circuit 40 rectifies an AC voltage (AC) and converts the level to supply the operating power of the control unit 40. In an exemplary embodiment of the present invention, the operation power of the control unit 40 is supplied through the power supply unit 41, but a battery is used or a DC voltage of 0 to 5 volts is output after level conversion from the power conversion circuit 21. Can be operated by

At this time, the controller 43 provides the initially set voltage control signal VCTL to the power conversion circuit 21. The power conversion circuit 21 converts the AC voltage AC input through the shunt resistor 31 into a voltage of DC 0 to 380 volts and supplies current to both ends of the coil 12 of the electromagnet filter 10 .

When a current flows through the coil 12, a magnetic field according to the Fleming's right-hand rule is formed in the matrix filter 14. The magnetic flux density (B) due to the magnetic field is proportional to the current flowing through the coil 12.

When the power-on is performed in the process S1 of FIG. 2, the controller 43 transmits the digital signal IS output from the ADC 33 and the resistance value of the shunt resistor 21 to the coil 12 in the process S2. Calculate the flowing current value. That is, the voltage drop (V) across the shunt resistor (21) and the resistance value (R) of the shunt resistor (21) are detected by a calculation formula based on Ohm's law to detect a current (I = V/R) flowing through the coil.

Thereafter, the controller 43 reads the length information of the matrix filter 14 stored in the memory 42, the winding (number of vibrations) information of the coil 12, and an electromagnet reference magnetic flux density value stored in the memory 42 in step S3, and the detected coil The magnetic flux density B of the electromagnet filter 10 is calculated by Equation 1 described above using the current I of (12) and the information read from the memory 42.

The value of the magnetic flux density B of the electromagnet filter 10 calculated by Equation 1 is the MKS unit system value [wb/m2]. The controller 43 converts the calculated magnetic flux density (B) of the MKS unit system into a value of the CGS unit system in step S4. For example, when the value of the magnetic flux density B calculated by Equation 1 is 1 [wb/m 2 ], it is converted into information of 10,000 Gauss.

Thereafter, the controller 43 displays the value of the magnetic flux density B of the CGS unit system on the touch screen 50 as shown in FIG. 3 in step S5.

Therefore, the operator of the electromagnet stripper 1 can easily check the magnetic flux density of the electromagnet filter 10 with a Gauss value when operating the initial system. When the Gaussian value displayed on the touch screen 50 is not a desired value, the magnetic flux density B of the electromagnet filter 10 can be easily adjusted using a voltage/current control button displayed on the touch screen 50.

When the temperature of the coil 12 in the housing 10 increases due to the continuous operation of the electromagnet filter 10, the current flows very well, and the value of the magnetic flux density B increases as the electromagnet filter 10 continues to operate.

When the value of the magnetic flux density B calculated by Equation 1 exceeds the error range of the reference magnetic flux density value set in the memory 42, the controller 43 adjusts the voltage control signal VCTL to obtain a voltage conversion circuit. The magnetic flux density of the electromagnet filter 10 is adjusted by dropping the output of (21).

Conversely, when the value of the magnetic flux density B calculated by Equation 1 falls below the value out of the error range of the reference magnetic flux density value set in the memory 42, the controller 43 transmits the voltage control signal VCTL. By adjusting the output of the voltage conversion circuit 21 to increase, the magnetic flux density of the electromagnet filter 10 may be increased.

Although the above has been described with reference to preferred embodiments of the present invention, those of ordinary skill in the art can variously modify and modify the present invention within the scope not departing from the spirit and scope of the present invention described in the claims. You will understand that you can change it.

1: electromagnet iron removal machine,
10: electromagnet filter,
11: housing, 12: coil, 13: canister, 14: matrix filter,
20: control circuit.
21: voltage conversion circuit. 31: shunt resistance, 32: volt meter,
33: ADC, 35: power monitor,
40: control unit,
41: power unit, 42: memory, 43: controller,
50: touch screen

Claims (5)

In the electromagnet Gauss display device of the electromagnet iron removal machine,
A through bore is formed in the center, a coil is wound around the bore, and a housing in which a cooling liquid is accommodated, and is inserted into the bore and supplied to the bore while current flows through the bore. An electromagnet filter composed of a matrix filter that absorbs and filters foreign substances of magnetic material contained in the raw material;
A power conversion device for converting an AC voltage to DC in response to a voltage control signal and providing it to both ends of the coil;
A power monitor configured to measure a current flowing through the coil using a voltage applied to a shunt resistor connected between the input terminal of the AC voltage and a power terminal of the power conversion device;
And a memory storing matrix filter length information of the electromagnet filter, coil winding information, and electromagnet reference magnetic flux density value, and supplying the voltage control signal to the power conversion device when the AC voltage is supplied to the power conversion device. And a controller for displaying the magnetic flux density of the electromagnet filter on a touch screen by calculating by the following equation using the current value measured by the power monitor,
The control unit converts a voltage control signal for adjusting the output of the power conversion device when a comparison value of the calculated magnetic flux density value and the electromagnet reference magnetic flux density value stored in the memory exceeds a preset tolerance. The electromagnet Gauss display device of the electromagnet scraper.
B = (μ·N·I)/d [wb/m²], where μ is the permeability of the matrix filter, N is the number of turns of the coil, I is the current flowing through the coil, and d is the length (electromagnet) of the matrix filter.
delete The method of claim 1, wherein the power monitor measures a voltage drop between both terminals of the shunt resistor by being connected in parallel to a shunt resistor connected between the input terminal of the AC voltage and a power terminal of the power conversion device, and the shunt resistor. An electromagnet Gaussian display device of an electromagnet iron removal machine, comprising: a voltmeter;
The electromagnet Gaussian display device of claim 3, wherein the control unit divides a voltage value output from the voltmeter by a resistance value of the shunt resistance to measure a current flowing through the coil.
The method according to any one of claims 1, 3 to 4, wherein the control unit converts the magnetic flux density value of the MKS unit system calculated by the equation into Gauss (G), which is the value of the CGS unit system, and displays it on the touch screen. Electromagnet Gaussian display device of the electromagnet iron removal machine, characterized in that.

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