Electromagnetic device and method for detecting the amount of magnetic material on a magnetic medium

Abstract

The application provides an electromagnetic iron remover device and method for detecting the magnetic substance load on a magnetic medium net, comprising a magnetic medium net magnetic cavity, a detection coil, a signal detection circuit and a control unit, a plurality of layers of magnetic medium nets are arranged in the magnetic medium net magnetic cavity; a plurality of detection coils are arranged on the inner side of the cavity wall of the magnetic medium net magnetic cavity, the signal detection circuit is connected with the detection coils, and is used for detecting the change of the inductance value of the detection coil in the process that the magnetic medium net adsorbs iron filings; the control unit is connected with the signal detection circuit, is used for judging the adsorption state of the magnetic medium net according to the change of the inductance value, and is used for controlling the working state of the magnetic medium net magnetic cavity. The application realizes the real-time detection of the magnetic substance load on the magnetic medium net of the electromagnetic iron remover based on the detection coil, and can realize the high-efficiency automatic screening and magnetic separation function of the iron remover.

Description

Technical Field

[0001] This invention belongs to the field of detection device technology, specifically relating to an electromagnetic iron remover device and method for detecting the magnetic load on a magnetic dielectric mesh. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] In industries such as plastics, glass, ceramics, chemicals, powder processing materials, and non-metallic minerals, powder raw materials often contain impurities such as iron powder and magnetic substances. To improve powder purity, various industries use iron separators to remove these impurities. Currently, widely used iron separators operate on a timed shutdown mode to remove magnetic materials from the magnetic mesh. However, the content of magnetic impurities in powders varies considerably. When the content of magnetic impurities is low, the magnetic material load on the magnetic mesh is often too low after the timed shutdown, thus the efficiency of the iron separator in this mode urgently needs improvement. When the content of magnetic impurities is high, the magnetic mesh is already fully loaded before the timed shutdown, so this mode also suffers from unsatisfactory impurity removal effects. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes an electromagnetic separator device and method for detecting the magnetic material load on a magnetic mesh. This invention utilizes a detection coil to achieve real-time detection of the magnetic material load on the magnetic mesh of the electromagnetic separator, enabling high-efficiency automatic screening and magnetic separation functions.

[0005] According to some embodiments, the present invention adopts the following technical solution:

[0006] An electromagnetic iron separator device for detecting the magnetic charge on a magnetic mesh includes a magnetic cavity of the magnetic mesh, a detection coil, a signal detection circuit, and a control unit, wherein:

[0007] The magnetic cavity of the magnetic mesh is provided with several layers of magnetic mesh;

[0008] The inner wall of the magnetic cavity of the magnetic mesh is provided with several turns of detection coil. The signal detection circuit is connected to the detection coil and is used to detect the change in the inductance value of the detection coil during the process of the magnetic mesh adsorbing iron filings.

[0009] The control unit is connected to the signal detection circuit and is used to determine the adsorption state of the magnetic mesh based on the change in inductance value, so as to control the working state of the magnetic cavity of the magnetic mesh.

[0010] As an alternative implementation, an excitation coil is wound around the magnetic cavity of the magnetic mesh, and the excitation coil is used to make the magnetic mesh magnetic.

[0011] As an alternative implementation, the detection coil is connected in series with a capacitor and then connected to the excitation source.

[0012] As a further implementation, the capacitor resonates with the detection coil when the magnetic mesh is unloaded.

[0013] As an alternative implementation, the signal detection circuit is used to detect the voltage value across the capacitor.

[0014] As an alternative implementation, the inductance of the detection coil increases as the amount of iron filings adsorbed on the magnetic mesh increases, and the voltage across the capacitor decreases accordingly.

[0015] As an alternative implementation, the control unit is used to determine the magnetic material load on the magnetic mesh of the iron separator based on the detected voltage data. When the voltage value drops to a threshold, it is determined that the magnetic mesh is fully loaded and the magnetic cavity of the magnetic mesh is controlled to stop working.

[0016] As a further implementation, the control unit is connected to the power supply circuit of the excitation coil, and when it is determined that the magnetic mesh is in a fully loaded state, the power supply circuit of the excitation coil is cut off.

[0017] As an alternative implementation, the threshold is determined based on a pre-trained model trained using existing data on capacitor voltage and magnetic adsorption of magnetic materials in a magnetic mesh.

[0018] The working method of the above-mentioned electromagnetic iron separator includes the following steps:

[0019] When the inductance of the detection coil reaches the set value, it is determined that the magnetic mesh is fully loaded. The magnetic cavity of the magnetic mesh is then controlled to stop working, and the magnetic mesh is shaken to remove the substances that have been adsorbed on it.

[0020] As an alternative implementation, the voltage value across the capacitor connected in series with the detection coil is obtained, the voltage amplitude and phase are extracted, preprocessed, and the preprocessed voltage value is compared with the threshold. If the voltage value is less than or equal to the threshold, it indicates that the inductance value has reached the set value.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] This invention does not require significant modifications to the structure of the electromagnetic iron separator. It only requires the addition of a detection coil wound inside the magnetic cavity of the separator. During the process of the magnetic mesh adsorbing magnetic impurities mixed in the mineral powder, the signal detection circuit detects the voltage change across the capacitor connected in series with the detection coil. This invention achieves real-time detection of the magnetic material load on the magnetic mesh based on the detection coil. By controlling the operation of the iron separator according to the magnetic material load on the magnetic mesh, it can effectively improve iron removal efficiency and significantly increase powder purity.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0024] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0025] Figure 1 This is a schematic diagram of the installation of the detection coil;

[0026] Figure 2 This is a circuit diagram for signal detection.

[0027] Figure 3 To detect the trend of coil inductance value changing with the amount of magnetic material loaded on the magnetic mesh;

[0028] Figure 4 This is a schematic diagram of the measurement principle of the detection device;

[0029] Figure 5 Flowchart of a method for detecting the magnetic charge on a magnetically measured dielectric mesh;

[0030] Figure 6 This is a block diagram of the signal detection circuit. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] Example 1

[0035] An electromagnetic iron removal device capable of real-time detection of the magnetic material load on a magnetic mesh includes a detection coil, a signal detection circuit, and a control unit connected in sequence. When the iron remover is working, the detection coil is wound inside the magnetic cavity of the iron remover. The signal detection circuit is used to detect the change in the inductance value of the detection coil during the adsorption of iron filings by the magnetic mesh. The control unit controls the working state of the electromagnetic iron remover based on the change in the inductance value.

[0036] This embodiment uses a detection coil to realize real-time detection of the magnetic material load on the magnetic medium. The working mode of the iron remover is controlled according to the magnetic material load on the magnetic medium, which can effectively improve the iron removal efficiency and greatly improve the purity of the powder.

[0037] The electromagnetic iron removal device contains multiple layers of magnetic mesh, and an excitation coil is wound around the outside of the magnetic cavity. When in operation, the magnetic mesh becomes magnetic.

[0038] In this embodiment, when the powder passes through the magnetic cavity, the magnetic mesh adsorbs the magnetic impurities mixed in the mineral powder, and the inductance value of the detection coil changes accordingly; the signal detection circuit detects the change in voltage across the capacitor connected in series with the detection coil; based on the detected voltage change data, the magnetic material load on the magnetic mesh of the iron separator is determined; when the threshold voltage is reached, that is, when the magnetic mesh is fully loaded, the control unit controls the excitation coil to be de-energized, the magnetic field disappears, the magnetic mesh is demagnetized, and the iron powder, magnetic medium, etc. on the magnetic mesh fall to the iron outlet and are discharged.

[0039] The structure of the detection coil is as follows Figure 1 As shown, it includes multiple turns, wound around the inner side of the magnetic cavity wall; the detection coil is connected in series with a capacitor and then connected to the control unit circuit.

[0040] The specific circuit design involves a capacitor located on an external circuit connected to the detection coil. When the magnetic mesh is unloaded, this capacitor resonates with the detection coil at a frequency of several megahertz. For example... Figure 2 As shown, the signal detection circuit is used to detect the voltage across the capacitor connected in series with the coil.

[0041] An alternating current of a certain frequency is passed through the detection coil, generating an alternating magnetic field. In the model construction of the detection coil, since the magnetic mesh and magnetic impurities such as iron filings can be equivalent to a large-gap iron core, its inductance value is:

[0042]

[0043] Among them, S C S is the effective cross-sectional area of ​​the iron core. S l is the equivalent area of ​​coil leakage flux. g l is the actual air gap length in the magnetic circuit of the iron core. C The average magnetic circuit length of the iron core is given by μ, where N is the number of turns in the inductor coil. ～ is the alternating permeability of the iron core. Due to μ... ～10 3 The order of magnitude is so small that it can be ignored. C Regarding the influence of L, L mainly changes with l. g It changes with the changes.

[0044] During the operation of the magnetic mesh, as it changes from being unloaded with iron filings to being fully loaded with them, multiple layers of magnetic mesh made of magnetically conductive medium are arranged from top to bottom inside the iron cavity. This is equivalent to the air gap length l of the equivalent magnetic core of the detection coil. g As the capacitance decreases, the self-inductance L of the detection coil increases, and its trend is as follows: Figure 3 As shown.

[0045] Therefore, the resonant state of the inductor and capacitor is disrupted, the circuit resistance increases, the circuit current decreases, and the voltage across the capacitor drops from its peak value. When the magnetic mesh is fully loaded, the capacitor voltage will drop to the threshold voltage.

[0046] In actual use, by constructing a dataset of capacitor voltage and magnetic material adsorption amount on the magnetic mesh, a model is established and trained to achieve real-time detection of the magnetic material load on the magnetic mesh. Based on the magnetic material load on the magnetic mesh, the working mode of the iron remover is controlled, effectively improving the iron removal efficiency and powder purity.

[0047] It also includes an excitation source that generates a waveform and converts it into a sine wave. The sine wave is then amplified and stabilized by a power amplification circuit to drive the detection coil, providing a constant driving current to the detection coil.

[0048] The control unit includes a main controller, which processes the detected voltage data to determine the adsorption state of the magnetic mesh. The main controller is also connected to other protection modules / circuits, such as overvoltage protection circuits, amplification circuits, filtering circuits, and A / D conversion circuits. These can all use existing circuits and will not be described in detail here.

[0049] The control unit also includes a control switch for controlling the on / off state of the excitation circuit.

[0050] Specifically, based on the detected voltage change data, the system's subsequent operating state can be determined and controlled, such as... Figure 6 As shown, the voltage value across the capacitor connected in series with the detection coil is acquired in real time, the voltage amplitude and phase are extracted, and preprocessed; the preprocessed voltage value is compared with the threshold voltage to determine whether to stop the excitation circuit and shake the magnetic mesh to remove iron filings, magnetic materials, etc.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art without creative effort within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An electromagnetic iron separator device for detecting the magnetic charge on a magnetic mesh, characterized in that, It includes a magnetic mesh cavity, a detection coil, a signal detection circuit, and a control unit, wherein: The magnetic cavity of the magnetic mesh is provided with several layers of magnetic mesh; The inner wall of the magnetic cavity of the magnetic mesh is provided with several turns of detection coil, including an excitation source. The excitation source generates a waveform and converts it into a sine wave. After the sine wave is amplified and stabilized by a power amplification circuit, it drives the detection coil, providing a constant driving current to the detection coil. The detection coil is connected in series with a capacitor and then connected to the excitation source. When the magnetic mesh is unloaded, the capacitor resonates with the detection coil. A signal detection circuit is connected to the detection coil to detect the change in the inductance value of the detection coil during the process of the magnetic mesh adsorbing iron filings. The electromagnetic iron removal device is provided with multiple layers of magnetic mesh, and an excitation coil is wound outside the magnetic cavity. When working, the magnetic mesh becomes magnetic. The control unit is used to determine the magnetic material load on the magnetic mesh of the iron separator based on the detected voltage data. When the voltage value drops to the threshold, it is determined that the magnetic mesh is fully loaded and the magnetic cavity of the magnetic mesh stops working. The control unit is connected to the signal detection circuit and is used to determine the adsorption state of the magnetic mesh based on the change in inductance value, so as to control the working state of the magnetic cavity of the magnetic mesh. When the powder passes through the magnetic cavity, the magnetic mesh adsorbs magnetic impurities mixed in the powder, causing a change in the inductance of the detection coil. The signal detection circuit detects the change in voltage across the capacitor connected in series with the detection coil. Based on the detected voltage change data, the magnetic material load on the magnetic mesh of the iron separator is determined. The threshold is determined based on a pre-trained model, which is trained using existing data on capacitor voltage and magnetic adsorption of magnetic materials in a magnetic mesh.

2. The electromagnetic iron separator device for detecting the magnetic load on a magnetic dielectric mesh as described in claim 1, characterized in that, The signal detection circuit is used to detect the voltage across the capacitor.

3. The electromagnetic iron separator device for detecting the magnetic load on a magnetic dielectric mesh as described in claim 1, characterized in that, The inductance of the detection coil increases as more iron filings are adsorbed onto the magnetic mesh, and the voltage across the capacitor decreases accordingly.

4. The operating method of the electromagnetic iron separator device according to any one of claims 1-3, characterized in that, Includes the following steps: When the inductance of the detection coil reaches the set value, it is determined that the magnetic mesh is fully loaded. The magnetic cavity of the magnetic mesh is then controlled to stop working, and the magnetic mesh is shaken to remove the substances that have been adsorbed on it.

5. The working method as described in claim 4, characterized in that, Obtain the voltage value across the capacitor connected in series with the detection coil, extract the voltage amplitude and phase, perform preprocessing, and compare the preprocessed voltage value with the threshold. If the voltage value is less than or equal to the threshold, it indicates that the inductance value has reached the set value.

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