CN202134309U - Intelligent demagnetizer - Google Patents

Abstract

The utility model relates to an intelligent demagnetizer, which comprises a two-way controllable module, a booster transformer, a rectifier stack, a charging current limiting resistor, a capacitor bank, an output controllable silicon set, the binding post of an external load coil, a voltage sampling module, a current sampling module, an A/D conversion module, a programmable logic controller (PLC), a D/A conversion module, an amplitude control module, a controllable silicon drive module and a human-machine interface intelligent industrial control touch control panel. In the prior art, the conventional demagnetization is realized by attenuating pulses through the natural oscillation mode and the surface magnetic field of a lodestone after the demagnetization process is still high. Therefore, the intelligent demagnetizer mainly solves technical defects that the machining processes of rare earth materials, such as remagnetizing, detecting, redemagnetizing, electroplating and so on, can not be solved and the quality requirements thereof can not be satisfied at all. The intelligent demagnetizer must be operated with the load of an external demagnetization coil and mainly solves the above problem in the prior art. The intelligent demagnetizer has the intelligent function of human-machine conversion and is suitable for the demagnetization of all existing magnetic materials, especially for high-coercive force rare earth magnetic materials that can not be fully demagnetized by other demagnetizers. Meanwhile, due to the adoption of the intelligent demagnetizer, the wave number, the wave period the initial magnitude of a demagnetization wave can be set.

Description

A kind of intelligent demagnetizer

Technical field

The utility model relates to the processing unit to magnetic material, particularly a kind of intelligent demagnetizer.

Background technology

(demagnetization of Hcj >=12000Oe), the main at present nature oscillatory extinction pulse mode that adopts is demagnetized to rare earth element magnet.As shown in Figure 1, it is the structure principle chart of existing natural decaying pulse demagnetizer, in order to reach high-effect, all adopts capacitance energy storage, the pulsed discharge way of output.Obtain high voltage to capacitor group charging energy storage through step-up transformer, export to coil, carry out electricity-magnetic conversion magnetic field takes place to obtain big electric current.Therefore; Be inductive load and storage capacitor and form series resonant tank, the output current wave of its demagnetization forms damped oscillation as shown in Figure 2, after taking off magnetoelectricity stream and acting on loading coil; Depleted rapidly in several cycles; Do not reach the variation of demagnetizing field positive and negative mode that progressively reduces with amplitude tens times, the result is as shown in the table, the table magnetic that magnetite is still remaining very high; That is to say and move back untotally, can't satisfy the magnetizing again of rare earth material at all, detect, demagnetize again, the technology of processing such as plating and the requirement of quality.

Magnetic material coercivity H j (Oe)	Residual surface magnetic field intensity Gs after the demagnetization
		＝13000	≥30
＝17000	≥60
		＝20000	≥100
＝25000	≥200
		＝27000	≥600
＝30000	≥800

[0004] We find that the demagnetization process of magnetic material is as shown in Figure 3 through the research back.After the ferromagnetics magnetization reaches capacity, remove magnetizing field, medium remains with certain magnetic, is referred to as residual magnetic flux density, is expressed as B _RIf will make it to be reduced to zero, must apply the magnetizing field that oppositely acquires a certain degree, be referred to as coercive force, be expressed as H _CCurved section RC is a demagnetization curve.In order to make magnetized state revert to initial point 0, external magnetic field is changed repeatedly positive and negative mode that progressively reduces with amplitude.Find that through our long-term experiment number of times so repeatedly needs more than up to a hundred times, and with a certain amount of amplitude attenuation, just can reach desirable demagnetization effectiveness.

The utility model content

The purpose of the utility model is to provide a kind of intelligent demagnetizer; Mainly solving existing employing nature oscillatory extinction pulse mode demagnetizes; The table magnetic that magnetite is still remaining very high; Can't satisfy the magnetizing again of rare earth material at all, detect, demagnetize again, the technology of processing such as plating and the technological deficiency of quality requirement, the utlity model has interactive intelligent function, can set demagnetization ripple week number, cycle, initial magnitude; Magnetic material demagnetization at present all is suitable for, and particularly other demagnetizers can't move back high-coercive force rare earth class magnetic material clearly.

For realizing above-mentioned purpose, the utility model is to realize like this.

A kind of intelligent demagnetizer is characterized in that: it is made up of binding post, voltage sampling module, current sampling module, A/D modular converter, PLC programmable logic controller (PLC), D/A modular converter, amplitude control module, controllable silicon driver module and the man-machine interface intelligence industry control touch control flow of two-way controlled module, step-up transformer, rectistack, charging current limiter resistance, capacitor group, output control Group of Silicon Controlled Rectifier, external load coil; Wherein: connect the binding post that two-way controlled module, step-up transformer, rectistack, charging current limiter resistance, capacitor group, output control Group of Silicon Controlled Rectifier and external load coil are set successively from mains side; The sampling end of described voltage sampling module is connected on the capacitor group, and its output is connected the signal input part of A/D modular converter; The sampling end of described current sampling module is connected near the coil, and its output also is connected the signal input part of A/D modular converter; The signal output part of described A/D modular converter is connected to the signal input part of PLC programmable logic controller (PLC); The signal output part of described PLC programmable logic controller (PLC) connects the controllable silicon driver module respectively and is connected to the amplitude control module through the D/A modular converter; The signal input part of described PLC programmable logic controller (PLC) also is connected with the industry control of man-machine interface intelligence and touches control flow.

Described intelligent demagnetizer, the interior work of program control in PLC by setting demagnetization ripple week number, cycle, initial magnitude makes output produce the demagnetization ripple of constant amplitude decay.

The utility model is created compared with prior art; Have following advantage and good effect: the utility model intelligence demagnetizer, the current waveform of its output is as shown in Figure 5, accomplishes controlled decay a little progressively; Cycle reaches up to a hundred times, has reached good demagnetization effectiveness.Can with the terres rares high-coercive force (magnetite of Hcj≤35000Oe), disposable demagnetize to Surface field intensity below 10Gs, can satisfy magnetizing, detect, demagnetize again, electroplate processing again and not having the requirement of magnetic shipping of this type magnetite.

Description of drawings

Fig. 1 is the structure principle chart of existing natural decaying pulse demagnetizer.

Fig. 2 is the output current wave figure of existing natural decaying pulse demagnetizer in the demagnetization operation.

Fig. 3 is the demagnetization process B-H figure of magnetic material.

Fig. 4 is the structure principle chart of the utility model.

Fig. 5 is the output current wave figure of the utility model intelligence demagnetizer in the demagnetization operation.

Closed loop Based Intelligent Control sequential chart when Fig. 6 is the utility model use.

Embodiment:

See also Fig. 4, the utility model discloses a kind of intelligent demagnetizer, must under external degaussion coil load, carry out work.As shown in the figure: it is by two-way controlled module (G1/G2), step-up transformer T1, rectistack D1, charging current limiter resistance R 1, capacitor group C, output control Group of Silicon Controlled Rectifier (forward: G3, G4, reverse G5, G6), coil R _L, voltage sampling module, current sampling module, A/D modular converter, PLC programmable logic controller (PLC), D/A modular converter, amplitude control module, controllable silicon driver module and the industry control of man-machine interface intelligence touch control flow and form; Wherein: connect successively from mains side two-way controlled module, step-up transformer, rectistack, charging current limiter resistance, capacitor group, output control Group of Silicon Controlled Rectifier and coil are set; The sampling end of described voltage sampling module is connected on the capacitor group, and its output is connected the signal input part of A/D modular converter; The sampling end of described current sampling module is connected near the coil, and its output also is connected the signal input part of A/D modular converter; The signal output part of described A/D modular converter is connected to the signal input part of PLC programmable logic controller (PLC); The signal output part of described PLC programmable logic controller (PLC) connects the controllable silicon driver module respectively and is connected to the amplitude control module through the D/A modular converter; The signal input part of described PLC programmable logic controller (PLC) also is connected with the industry control of man-machine interface intelligence and touches control flow.Wherein, the G3 of described controllable silicon driver module, G4, G5, G6 end connect G3, G4, G5, the G6 end of output control Group of Silicon Controlled Rectifier respectively, and the G1 of described amplitude control module, G2 end connect G1, the G2 end of two-way controlled module respectively.

According to following formula:

B=μ ₀NI formula (1)

$i_L=\frac{\mathrm{Uc}}{R_L}{e}^{(-\mathrm{\τ\; t})}$ Formula (2)

Expressed suc as formula (1), the magnetic flux density that produces on the coil is directly proportional with the electric current that flows through coil, and is expressed suc as formula (2), and the voltage U c that is charged to of the electric current of output and capacitor group is proportional, and Uc as shown in Figure 4 is by the charging voltage U of T1 secondary side _T2Rectification obtains, and its size depends on U _T2, and follow the voltage U of T1 primary side _T1Change,, just can change U through regulating the angle of flow Φ of bidirectional triode thyristor _T1Thereby, the amplitude of electric current on the control load, thereby the intensity of change demagnetizing field.

The utility model can be capacitance terminal initial charge saturation voltage V through the touch-screen setting voltage value at man-machine interface intelligence industry control touch screen operation interface _C0, and set demagnetization decay number of times and be demagnetization ripple week number, thus, formula (3) has been established the amplitude Vm of each decay, and N representes to set the decay number of times, and formula (4) has confirmed to decay to the n time the voltage magnitude Vn that magnetizes.

$\mathrm{Vm}=\frac{{\mathrm{Vc}}_0}{N}$ Formula (3)

$\mathrm{Vn}=\frac{{\mathrm{Vc}}_0-n\·\mathrm{Vm}}{n}$ Formula (4)

Closed loop Based Intelligent Control sequential was as shown in Figure 6 when the utility model used, and T1+T2=T4=T6, T3=T5, T1+T2+T3=T are one and demagnetize period of wave.Its process is: at the beginning, PLC sends the signal that magnetizes according to program command, converts digital signal to analog signal Vk by the D/A modular converter, controls two-way controlled module (G1/G2) through the amplitude control module.In the T1 period, Vk0 becomes rising waveform (shown in Fig. 6 top), and it is big that the angle of flow of two-way controlled module (G1/G2) also progressively becomes thereupon, is reflected in the also rising simultaneously of voltage U c (shown in Fig. 6 middle part) of magnetizing at electric capacity two ends.At this moment, the voltage sampling of the isolated transmission circuit of high pressure, the level measured voltage Uc is transformed to 0～5V becomes digital signal to offer PLC through the A/D module converts, when Uc rises to set point U _C0The time, PLC is amplitude control signal V _kConstant in V _K0On the level, make after the period that through T2 the electric capacity charging is fully saturated.In the T3 period, PLC opens through controllable silicon driver module triggering G3, G4, and loading coil RL is carried out forward discharge (shown in Fig. 6 bottom), accomplishes the first discharge wave of demagnetization.Once more electric capacity is magnetized in the logical T4 period, different is that the Uc voltage that samples is to compare with UC1 (in interior storage program, calculating according to formula (4)), is that triggering G5, G6 open to the T4 period then, forms loading coil RL is reversed discharge.Begin once more the amount of decrease charging and become loading coil RL forward is discharged to the T5 period.Be recycled to the number of times of setting in this way, just realized the alternation shown in the figure (5) and the demagnetizing field of linear attenuation.Demagnetization T wave period is the electric energy characteristic according to equipment, regulates through being programmed in certain scope.

In sum, being merely the preferred embodiment of the utility model, is not the practical range that is used for limiting the utility model, and promptly all equivalences of doing according to the content of the utility model claim change and modify, and all should be the technological category of the utility model.

Claims (1)

1. intelligent demagnetizer is characterized in that: it touches control flow by binding post, voltage sampling module, current sampling module, A/D modular converter, PLC programmable logic controller (PLC), D/A modular converter, amplitude control module, controllable silicon driver module and the industry control of man-machine interface intelligence of two-way controlled module, step-up transformer, rectistack, charging current limiter resistance, capacitor group, output control Group of Silicon Controlled Rectifier, external load coil and forms; Wherein: connect the binding post that two-way controlled module, step-up transformer, rectistack, charging current limiter resistance, capacitor group, output control Group of Silicon Controlled Rectifier and external load coil are set successively from mains side; The sampling end of described voltage sampling module is connected on the capacitor group, and its output is connected the signal input part of A/D modular converter; The sampling end of described current sampling module is connected near the coil, and its output also is connected the signal input part of A/D modular converter; The signal output part of described A/D modular converter is connected to the signal input part of PLC programmable logic controller (PLC); The signal output part of described PLC programmable logic controller (PLC) connects the controllable silicon driver module respectively and is connected to the amplitude control module through the D/A modular converter; The signal input part of described PLC programmable logic controller (PLC) also is connected with the industry control of man-machine interface intelligence and touches control flow.

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