CN109616278B - Intelligent nano powder demagnetizer and demagnetization method - Google Patents
Intelligent nano powder demagnetizer and demagnetization method Download PDFInfo
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- CN109616278B CN109616278B CN201910078484.4A CN201910078484A CN109616278B CN 109616278 B CN109616278 B CN 109616278B CN 201910078484 A CN201910078484 A CN 201910078484A CN 109616278 B CN109616278 B CN 109616278B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
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Abstract
The invention discloses an intelligent nano powder demagnetizer, which comprises a control module, an amplitude amplification module, a power amplification module and a demagnetizing coil, wherein the amplitude amplification module is connected with the control module; the signal output end of the control module is connected with the signal input end of the amplitude amplification module, the signal output end of the amplitude amplification module is connected with the signal input end of the power amplification module, and the power amplification module is electrically connected with the demagnetizing coil. The control module generates a sine wave signal according to an input control command, and the sine wave signal is input into the demagnetizing coil to generate a demagnetizing magnetic field after amplitude amplification and power amplification. The advantages are that: the invention can accurately control the frequency, demagnetizing time, demagnetizing times, strength of demagnetizing magnetic field, etc. of demagnetizing current, can make different demagnetizing schemes according to different demagnetizing objects, and is especially suitable for nanoscale powder demagnetizing.
Description
Technical Field
The invention relates to the field of demagnetizers, in particular to an intelligent nano powder demagnetizer and a demagnetization method.
Background
In the prior art, most demagnetizers adopt low-frequency large current to generate an alternating magnetic field which is gradually reduced according to an exponential law so as to achieve the purpose of demagnetization. When the size of a demagnetizing object is relatively large, the demagnetizer in the prior art can achieve a good demagnetizing effect. However, in practical use, it is often necessary to demagnetize a substance having an extremely small size of the order of nanometers. If the nano-scale metal and the oxidized powder thereof need to be oxidized when the transmission electron microscope is used, otherwise, the problem of powder agglomeration is easy to occur. In contrast, in the demagnetizing device of the prior art, when powder with a diameter of less than 100nm is demagnetized, the size of the demagnetizing field is not easy to control, and when the demagnetizing field is too large, the powder generates heat effect during demagnetization and is sintered into a block. Namely, the demagnetizer in the prior art can destroy the self shape of a demagnetized object when demagnetizing the nano powder. Therefore, when demagnetizing a nanoscale powder, the control of the magnitude of the magnetic field in the demagnetizing field is essential for demagnetization.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide an intelligent nano powder demagnetizer and a demagnetizing method. The invention can accurately control the frequency, demagnetizing time, demagnetizing times, strength of demagnetizing magnetic field, etc. of demagnetizing current, can make different demagnetizing schemes according to different demagnetizing objects, and is especially suitable for nanoscale powder demagnetizing.
The invention relates to an intelligent nano powder demagnetizer which comprises a control module, an amplitude amplification module, a power amplification module and a demagnetizing coil, wherein the amplitude amplification module is connected with the control module; the signal output end of the control module is connected with the signal input end of the amplitude amplification module, the signal output end of the amplitude amplification module is connected with the signal input end of the power amplification module, and the power amplification module is electrically connected with the demagnetizing coil.
Preferably, the control module generates a sine wave signal according to an input control command and inputs the sine wave signal into the amplitude amplification module; the amplitude amplification module is used for carrying out amplitude amplification on the sine wave signal and inputting the sine wave signal into the power amplification module; the power amplification module is used for generating demagnetizing current after power amplification is carried out on the sine wave signal, and the demagnetizing current is input into the demagnetizing coil to generate a demagnetizing magnetic field; the control instruction comprises degaussing times, degaussing time and degaussing current frequency.
Preferably, the control module comprises an STM32 singlechip, and further comprises a clock circuit and a reset circuit which are electrically connected with the STM32 singlechip.
Preferably, the device further comprises a capacitive touch screen, and the capacitive touch screen is in signal interaction with the control module.
Preferably, the touch screen power supply further comprises a voltage-stabilized power supply module for supplying power to the control module, the amplitude amplification module, the power amplification module and the capacitive touch screen.
Preferably, the amplitude amplifying module is a programmable voltage amplifier, and the programmable voltage amplifier comprises a VCA821 chip.
Preferably, the power amplification module comprises a TDA7294 chip.
Preferably, the degaussing coil be the high frequency coil two terminal surfaces department of high frequency coil all be equipped with the organic glass board, be equipped with high frequency ferrite magnetic stripe on the surface that one of them organic glass board kept away from high frequency coil, high frequency ferrite magnetic stripe around the central point of terminal surface put evenly the arrangement.
Preferably, the degaussing coil is in a shape of a disc, and the diameter of the degaussing coil is 130mm-150 mm; the organic glass plate is a cube, the side length of the organic glass plate is 170mm-190mm, and the thickness of the organic glass plate is 3mm-5 mm.
One demagnetization method comprises the following steps: the control module generates a sine wave signal according to the input control instruction, and the sine wave signal is input into the demagnetizing coil to generate a demagnetizing magnetic field after amplitude amplification and power amplification.
The invention relates to an intelligent nano powder demagnetizer and a demagnetization method, which have the advantages that:
1. the control module generates a sine wave signal according to the control instruction, the sine wave signal is subjected to amplitude amplification through the amplitude amplification module, then power amplification is carried out through the power amplification module, a demagnetizing current is provided for the demagnetizing coil, and the demagnetizing current generates a demagnetizing magnetic field at the demagnetizing coil to demagnetize an object needing demagnetizing. Because the sine wave signal is generated by the control module, the frequency, the demagnetizing time, the demagnetizing times, the strength of the demagnetizing magnetic field and the like of the demagnetizing current can be accurately controlled by the control module, and different demagnetizing schemes can be formulated according to different demagnetizing objects. And the demagnetization process is automatically controlled by the control module without manual adjustment. The invention can demagnetize demagnetized objects with different sizes, is particularly suitable for the demagnetization of nanoscale powder, can accurately control the strength of a demagnetizing magnetic field, and solves the problem that the powder is sintered and agglomerated due to overlarge magnetic field.
2. The single chip microcomputer is stable in control and low in cost, and is suitable for being used as a control element of the control module.
3. STM32 series single-chip microcomputer has the advantages of high performance, low cost and low energy consumption.
4. The capacitive touch screen is used for displaying relevant information of the demagnetizer according to the signal output by the control module, namely relevant information of the demagnetizing process, and inputting relevant instructions to the control module through the capacitive touch screen, and is mainly used for inputting relevant parameters of the demagnetizing process. The capacitive touch screen has the advantage of convenience in operation and control, and human-computer interaction is realized through the capacitive touch screen.
5. The voltage-stabilized power supply module can output different voltages, such as +/-20V, +5V, +3.3V and the like, so as to meet the working voltage requirements of different modules.
6. The program-controlled voltage amplifier has the characteristic of being controllable through a program, and the amplification amplitude of the program-controlled voltage amplifier can be controlled, so that the related parameters of the demagnetization process can be better controlled. The VCA821 chip has the advantages of good gain amplification effect, no need of an external buffer circuit, linear change of voltage control gain and good controllability.
7. The TDA7294 chip has the advantages of small size, high output power, low distortion and perfect protection function. Suitable as a core element of the power amplification module of the present invention. The power amplification module formed by the chip has the advantages of wide frequency band, high power, capability of meeting the amplification of different demagnetizing currents and wide application range.
8. The organic glass plate is used for fixing the demagnetizing coil, the high-frequency ferrite magnetic strips uniformly distributed around the center of the end face can linearly enhance the magnetic induction intensity of the demagnetizing coil after the coil is electrified, and the demagnetizing magnetic field intensity generated by the demagnetizing coil can be controlled by controlling the parameters of the demagnetizing current. Because the magnetic induction intensity of the high-frequency ferrite magnetic strip is in a linear relation with the magnitude of the demagnetizing current, the high-frequency ferrite magnetic strip enhances the magnetic induction intensity of the demagnetizing coil and simultaneously enhances the controllability of the demagnetizing coil.
9. The shape and the size of the degaussing coil can obtain a good degaussing magnetic field, and the shape and the size of the organic glass plate are convenient to process and good in fixing effect.
Drawings
FIG. 1 is a block diagram of an intelligent nanopowder demagnetizer of the present invention;
FIG. 2 is a circuit diagram of an amplitude amplification block;
fig. 3 is a circuit diagram of a power amplification module;
fig. 4 is a top view of the degaussing coil;
fig. 5 is a front view of the degaussing coil;
FIG. 6 is a flow chart of the steps of a degaussing method of the present invention.
Description of reference numerals: the device comprises a control module 1, an amplitude amplification module 2, a power amplification module 3, a demagnetizing coil 4, a capacitive touch screen 5, an organic glass plate 6 and a high-frequency ferrite magnetic strip 61.
Detailed Description
As shown in fig. 1, the intelligent nano-powder demagnetizer of the present invention comprises a control module 1, an amplitude amplification module 2, a power amplification module 3, and a demagnetizing coil 4; the signal output end of the control module 1 is connected with the signal input end of the amplitude amplification module 2, the signal output end of the amplitude amplification module 2 is connected with the signal input end of the power amplification module 3, and the power amplification module 3 is electrically connected with the demagnetizing coil 4.
The working principle of the invention is as follows: the control module 1 generates a sine wave signal according to the control instruction, and the sine wave signal is subjected to amplitude amplification through the amplitude amplification module 2 to reach a voltage amplitude enough to drive the power amplification module 3 and then is input into the power amplification module 3. The power amplification module 3 performs power amplification on the signal, and then the demagnetizing current is transmitted to the demagnetizing coil 4 by the amplified signal. After entering the degaussing coil 4, the degaussing current generates a vertical alternating magnetic field, i.e. a degaussing magnetic field. The demagnetizing magnetic field demagnetizes a demagnetized object in the magnetic field. The frequency and amplitude of the generated sine wave are controlled by the control module, the frequency, demagnetizing time, demagnetizing times, strength of a demagnetizing magnetic field and the like of the demagnetizing current can be controlled, and different demagnetizing schemes are formulated according to different demagnetizing objects.
The demagnetization process is automatically controlled by the control module without manual adjustment. The invention is especially suitable for the demagnetization of nano-scale powder, can effectively control the strength of a demagnetization magnetic field, and solves the problem that the powder is sintered and agglomerated due to overlarge magnetic field.
The control module 1 comprises a single chip microcomputer, and further comprises a clock circuit and a reset circuit which are electrically connected with the single chip microcomputer. The singlechip is an STM32 singlechip. STM32 series single-chip microcomputer has the advantages of high performance, low cost and low energy consumption. Suitable as a control element of the control module 1 of the invention.
The device further comprises a capacitive touch screen 5, wherein the capacitive touch screen 5 is in signal interaction with the control module 1. The capacitive touch screen 5 is used for inputting an operation instruction and displaying state information of the demagnetizer so as to complete man-machine interaction. The capacitive touch screen has the advantage of convenience in operation and control.
The device further comprises a voltage-stabilized power supply module for supplying power to the control module 1, the amplitude amplification module 2, the power amplification module 3 and the capacitive touch screen 5. Different modules need different working voltages, so a voltage-stabilized power supply module with multiple output ends needs to be arranged to provide different working voltages. Such as + -20V, +5V, +3.3V, etc.
The amplitude amplifying module 2 is a programmable voltage amplifier, and the programmable voltage amplifier comprises a VCA821 chip. The power amplification module 3 comprises a TDA7294 chip.
The STM32 singlechip is powered by 3.3V power supply, the amplitude of output signal is less than 3V, and the degaussing coil 4 needs to be led in sine wave current with ampere magnitude to generate degaussing magnetic field. Therefore, the output signal of the singlechip must be amplified through a circuit. The amplification of the amplitude is mainly achieved by a program-controlled voltage amplifier, and the internal circuit of the VCA821 chip is mainly composed of two input buffers and an output current feedback amplifier as shown in FIG. 2, so that a complete variable gain amplifier is constructed, and the amplifier does not need external buffering. The maximum gain may be set between 6 db and 32 db. When a +/-5V power supply is adopted for supplying power, the gain control voltage is changed from 0V to +2V, the gain of the VCA821 chip is in dB unit, and the output can be between 0 and 20 dB. The voltage control gain of the VCA821 chip is linearly changed, and the gain amplification effect is good.
The TDA7294 chip is a product of Italian microelectronics corporation, and has the characteristics of small volume, high output power, small distortion and complete protection function. As shown in FIG. 3, the power amplifier module 3 formed by the chip can be powered by positive and negative power supplies, and can provide a sufficient degaussing current when the voltage is + -20V and the output power reaches about 60W.
The degaussing coil 4 be high frequency coil two terminal surfaces department of high frequency coil all be equipped with organic glass board 6, be equipped with high frequency ferrite magnetic stripe 61 on the surface that one of them organic glass board 6 kept away from high frequency coil, high frequency ferrite magnetic stripe 61 around the central point of terminal surface put evenly arranging. The degaussing coil 4 is in a disc shape, and the diameter of the degaussing coil is 130mm-150 mm; the organic glass plate 6 is a cube, the side length of the organic glass plate is 170mm-190mm, and the thickness of the organic glass plate is 3mm-5 mm.
In the present embodiment, as shown in fig. 4 and 5, the degaussing coil 4 is wound by using a metallic copper enameled wire with a diameter of 0.50mm, and has a disc shape. The degaussing coil 4 has an inductance of 30mH and a diameter of 140 mm. The upper end face and the lower end face of the degaussing coil 4 are respectively fixed by two pieces of square organic glass with the thickness of 4mm and the side length of 180 mm. Four high-frequency ferrite magnetic strips are uniformly arranged at the bottom of one piece of organic glass around the central position of the end face so as to enhance the magnetic induction intensity, further enhance the demagnetizing field and improve the demagnetizing effect of the demagnetizing coil.
A degaussing method is characterized in that a control module 1 generates a sine wave signal according to an input control instruction, and the sine wave signal is input into a degaussing coil 4 to generate a degaussing magnetic field after amplitude amplification and power amplification. In this embodiment, the control command includes a degaussing frequency, a degaussing time, and a degaussing current frequency. The sine wave signal is subjected to amplitude amplification through the amplitude amplification module 2, power amplification is performed on the sine wave signal through the power amplification module 3, then a degaussing current is generated and input into the degaussing coil 4 to generate a degaussing magnetic field, and a degaussing object is degaussed.
The control flow of the present invention is as shown in fig. 6, and the demagnetizer is initialized after being turned on, the timer in the clock circuit is initialized, the capacitive touch screen 5 is initialized, and each module is initialized. The degausser enters a wait for command input state. If the capacitive touch screen 5 has an instruction input, the demagnetizer prompts the input of the number of continuous demagnetization, the time of each demagnetization and the value of the demagnetization current frequency. After the three input operations are finished, the system outputs sine wave voltage with specified parameters, and amplitude amplification is carried out through the amplitude amplification module 2. Then the magnetic field is input into a power amplification module 3, power amplification is carried out through the power amplification module 3, and the magnetic field is input into a demagnetizing coil 4 to generate a demagnetizing magnetic field for demagnetizing.
It will be apparent to those skilled in the art that various other changes and modifications may be made in the above-described embodiments and concepts and all such changes and modifications are intended to be within the scope of the appended claims.
Claims (8)
1. An intelligent nano powder demagnetizer is characterized by comprising a control module (1), an amplitude amplification module (2), a power amplification module (3) and a demagnetizing coil (4); the signal output end of the control module (1) is connected with the signal input end of the amplitude amplification module (2), the signal output end of the amplitude amplification module (2) is connected with the signal input end of the power amplification module (3), and the power amplification module (3) is electrically connected with the demagnetizing coil (4);
the degaussing coil (4) is a high-frequency coil, two end faces of the high-frequency coil are respectively provided with an organic glass plate (6), the surface of one of the organic glass plates (6) far away from the high-frequency coil is provided with a high-frequency ferrite magnetic stripe (61), and the high-frequency ferrite magnetic stripes (61) are uniformly arranged around the center of the end faces;
the control module (1) generates a sine wave signal according to an input control instruction and inputs the sine wave signal into the amplitude amplification module (2); the amplitude amplification module (2) amplifies the amplitude of the sine wave signal and inputs the sine wave signal into the power amplification module (3); the power amplification module (3) performs power amplification on the sine wave signal to generate a demagnetizing current, and inputs the demagnetizing current into the demagnetizing coil (4) to generate a demagnetizing magnetic field; the control instruction comprises degaussing times, degaussing time and degaussing current frequency.
2. The intelligent nano-powder demagnetizer of claim 1, wherein the control module (1) comprises an STM32 single chip microcomputer, and further comprises a clock circuit and a reset circuit which are electrically connected with the STM32 single chip microcomputer.
3. The intelligent nano-powder demagnetizer of claim 1, further comprising a capacitive touch screen (5), wherein the capacitive touch screen (5) is in signal interaction with the control module (1).
4. The intelligent nano-powder demagnetizer of claim 3, further comprising a voltage-stabilized power supply module for supplying power to the control module (1), the amplitude amplification module (2), the power amplification module (3) and the capacitive touch screen (5).
5. The intelligent nanopowder demagnetizer of claim 1, wherein the amplitude amplification module (2) is a programmable voltage amplifier comprising a VCA821 chip.
6. An intelligent nanopowder demagnetizer according to claim 1, wherein the power amplification module (3) comprises a TDA7294 chip.
7. An intelligent nanopowder demagnetizer as recited in claim 1, wherein the demagnetizing coil (4) is in the shape of a disc with a diameter of 130mm-150 mm; the organic glass plate (6) is a cube, the side length of the organic glass plate is 170-190 mm, and the thickness of the organic glass plate is 3-5 mm.
8. A demagnetizing method using the intelligent nano-powder demagnetizer as defined in any one of claims 1-7, wherein the control module (1) generates a sine wave signal according to an input control command, and the sine wave signal is subjected to amplitude amplification and power amplification and then input to the demagnetizing coil (4) to generate a demagnetizing field.
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| CN101702361B (en) * | 2009-11-17 | 2011-08-10 | 武汉市长江电气发展有限公司 | Ultra-low frequency alternating-current (AC) constant-current demagnetization device of large transformer or mutual inductor and demagnetization detection method |
| CN202134309U (en) * | 2011-05-10 | 2012-02-01 | 上海瑞穗磁气有限公司 | Intelligent demagnetizer |
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| CN105225791B (en) * | 2015-10-30 | 2017-06-13 | 北京自动化控制设备研究所 | A kind of overall degaussing gear of magnetic shielding barrel |
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| CN108933015B (en) * | 2018-07-20 | 2020-11-06 | 深圳普诺玛商业安全设备有限公司 | Demagnetization circuit, demagnetizer and control method of demagnetization circuit |
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| JP2006230124A (en) * | 2005-02-18 | 2006-08-31 | Nippon Denji Sokki Kk | Power supply for magnetization |
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Application publication date: 20190412 Assignee: Yulin Landaxun Electronic Technology Co.,Ltd. Assignor: Yulin Normal University Contract record no.: X2022450000543 Denomination of invention: An intelligent nano powder degaussing device and degaussing method Granted publication date: 20210511 License type: Common License Record date: 20221229 |