CN214799322U - Magnetic pulse ore discharging circuit for electromagnetic slurry magnetic separator - Google Patents
Magnetic pulse ore discharging circuit for electromagnetic slurry magnetic separator Download PDFInfo
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- CN214799322U CN214799322U CN202121431429.8U CN202121431429U CN214799322U CN 214799322 U CN214799322 U CN 214799322U CN 202121431429 U CN202121431429 U CN 202121431429U CN 214799322 U CN214799322 U CN 214799322U
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Abstract
The utility model discloses a magnetic pulse unloading circuit for an electromagnetic slurry magnetic separator, which belongs to the technical field of a rectification power supply device and comprises a three-phase alternating current power supply, a three-phase transformer, an alternating current reactor, a first three-phase rectification bridge group, a shunt, an electromagnetic coil and a second three-phase rectification bridge group which are coupled in sequence; the shunt is coupled with a shunt signal conditioning circuit, the shunt signal conditioning circuit is coupled with a PID controller, and the PID controller is respectively coupled with the first three-phase rectifier bridge group and the second three-phase rectifier bridge group; the PID controller is coupled with a voltage zero signal sampling circuit; the utility model discloses can pour into periodic pulsating current into for solenoid when solenoid demagnetization unloads the ore deposit, make the medium net piece become wavy "swing", at this moment, the water under high pressure can fully pierce through the tailing of adsorbing on the medium net, does not keep "dead angle", has improved the work efficiency of electromagnetic paste magnet separator, has prolonged the artifical maintenance cycle of medium net piece.
Description
Technical Field
The utility model relates to a rectification power supply technical field, concretely relates to magnetic pulse unloading circuit for electromagnetic paste magnet separator.
Background
The electromagnetic slurry magnetic separator is a device for effectively purifying weak magnetic impurities in nonmetallic minerals by using electromagnetic force applied to the mineral processing industry, and mainly comprises a magnetic system assembly, a plurality of groups of electromagnetic coils connected in parallel, a rectification power supply system, a water circulation cooling device and the like, wherein the working power supply of the electromagnetic coils is a direct current discontinuous power supply. The direct current discontinuous power supply is a direct current power supply with adjustable duty ratio and amplitude which is generated under the closed-loop control method of a rectification power supply. When the electromagnetic coil flows in the direct current with adjustable duty ratio and amplitude, the direct current magnetic field with adjustable duty ratio and amplitude can be generated. When a direct-current magnetic field exists, the nonmetallic minerals with the weak magnetic impurities pass through the cavity of the electromagnetic slurry magnetic separator, the weak magnetic impurities can be adsorbed in the magnetic medium, and the high-purity nonmetallic minerals flow out of the cavity to be purified. When the direct-current magnetic field disappears, the non-metallic minerals with the weak magnetic impurities stop entering the cavity of the electromagnetic slurry magnetic separator, and the weak magnetic impurities in the cavity can be washed out by using high-pressure water to form a working cycle. The electromagnetic slurry magnetic separator operates periodically according to the above described duty cycle.
The traditional direct current discontinuous power supply for the electromagnetic slurry magnetic separator comprises a transformer, a three-phase alternating current circuit breaker, a three-phase alternating current contactor, a three-phase rectifier bridge, a fly-wheel diode, a plate resistor, a resistance-capacitance protection circuit and the like. When the rectifier bridge works, a power grid power supply is firstly switched on by the three-phase alternating current circuit breaker and then flows into the three-phase alternating current contactor, the three-phase alternating current contactor is closed and then enters the three-phase rectifier bridge, the three-phase rectifier bridge rectifies the power to obtain a direct current power supply, and the direct current power supply acts on the electromagnetic coil to generate a stable direct current magnetic field. When the three-phase rectifier bridge stops working, the electric energy stored in the electromagnetic coil forms a loop through the freewheeling diode connected with the plate resistor in series, and the rapid discharge demagnetization is realized through the heating of the resistance of the electromagnetic coil and the active inversion mode, so that the weak magnetic impurities in the cavity are cleaned by the high-pressure water. Because the electromagnetic slurry magnetic separator has the factors of large quantity of medium meshes inside the electromagnetic slurry magnetic separator, dense meshes, uneven distribution of cavities, unreasonable arrangement of peripheral pipelines on the site of equipment and the like, and the problems of incomplete medium mesh washing and short manual maintenance period exist, the medium meshes need to be disassembled for manual cleaning in half a month of operation, and otherwise, the working efficiency and the impurity removal effect of the electromagnetic slurry magnetic separator are influenced.
Aiming at the current situations that the medium net is not thoroughly washed and the manual maintenance period is short, in order to solve the problems that the medium net is not thoroughly washed and the manual maintenance period is short, the stable operation of the electromagnetic slurry magnetic separator is ensured, the working efficiency of the electromagnetic slurry magnetic separator is improved, and the prior art generally adopts the following method for processing:
one, replace the high flow flush pump and/or increase the number of flush pumps. Although the method can increase the ore discharge pressure and the ore discharge flow of the electromagnetic slurry magnetic separator, the tailings at the dead corner of the medium net cannot be cleaned, the stockpiling quantity of the tailings at the dead corner can be accelerated, and weak magnetic minerals which can be adsorbed by the medium net can be reduced in a long time, so that the concentrate grade is influenced finally; the pressure of washing water in the cavity is increased, so that the mechanical abrasion of the medium net is accelerated, and the service life of equipment is influenced; the quantity of the water pumps is increased, the installed power of the control system can be increased, and the production cost is improved.
Secondly, a hydraulic lifting device is additionally arranged on the upper magnetic pole, when the magnetic separation starts to work, a rectification power supply is started, the hydraulic cylinder is controlled to lower the upper magnetic pole head to a lower limit position, the internal medium net is in a 'compaction' state, and the nonmetallic minerals with weak magnetic impurities start to enter the cavity of the electromagnetic slurry magnetic separator; when the magnetic separation time is up, the rectification power supply stops, the hydraulic cylinder is controlled to lift the upper magnetic pole head to the upper limit, the internal medium net is in a fluffy state, and the high-pressure water pump is controlled to flush the tailings. Although the method can solve the problem that the medium net piece in the electromagnetic slurry magnetic separator is not thoroughly washed, the frequent lifting of the upper magnetic pole head can accelerate the mechanical abrasion of the sealing film and cause ore leakage; and the speed of lifting the upper magnetic pole is low, so that the working efficiency of the equipment is influenced, the waiting waste is caused, and the production cost is increased.
And thirdly, replacing the medium mesh with large aperture and additionally installing a compressed air valve. Although the method can prolong the manual maintenance period of the medium mesh in the electromagnetic slurry magnetic separator, the increase of the meshes can reduce the induction field intensity on the surface of the medium, increase the magnetic separation difficulty of fine-grained minerals, and reduce the concentrate grade because some minerals sensitive to the magnetic field intensity cannot be purified.
The existing ore unloading mode for the electromagnetic slurry magnetic separator is mostly influenced by factors such as the field pipeline layout of equipment and the like by improving mechanical parts to improve the washing effect of the magnetic conductive medium net piece, so that the problems that the medium net is not thoroughly washed, the manual maintenance period of the medium net piece is prolonged and the complicated field layout environment is adapted are solved. By adopting the prior art and the method, the medium meshes cannot be thoroughly washed clean, but secondary faults are caused due to mechanical abrasion of parts, the separation efficiency of equipment is directly related, and the electromagnetic slurry magnetic separator cannot work normally in serious cases.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a pair of electromagnetic pulse unloads ore circuit for electromagnetic paste magnet separator, can unload the ore when solenoid demagnetization, inject periodic pulsating current into for solenoid, produce periodic pulsating magnetic field under the pulsating current effect, pulsating magnetic field acts on the medium net piece and can make the medium net piece become wavy "swing", this moment, the high pressure water can fully pierce through the tailing of adsorbing on the medium net, do not keep "dead angle", the work efficiency of electromagnetic paste magnet separator has been improved, the artifical maintenance cycle of medium net piece has been prolonged, also can make magnetic separation concentrate grade obtain the promotion simultaneously.
In order to realize the purpose, the utility model discloses a technical scheme as follows:
a magnetic pulse ore unloading circuit for an electromagnetic slurry magnetic separator comprises a three-phase alternating current power supply, a three-phase transformer, an alternating current reactor, a first three-phase rectifier bridge group, a current divider, an electromagnetic coil and a second three-phase rectifier bridge group which are coupled in sequence; the alternating current reactor is coupled with a power capacitor, and the power capacitor is coupled with the second three-phase rectifier bridge group; the current divider is coupled with a current divider signal conditioning circuit, the current divider signal conditioning circuit is coupled with a PID controller, and the PID controller is respectively coupled with the first three-phase rectifier bridge group and the second three-phase rectifier bridge group; silicon controlled trigger modules are respectively coupled between the PID controller and the first three-phase rectifier bridge group and between the PID controller and the second three-phase rectifier bridge group; and each phase circuit of the three-phase alternating current power supply is coupled with a voltage zero signal sampling circuit, and the voltage zero signal sampling circuit is coupled with the silicon controlled rectifier triggering module.
As a preferred technical solution, the shunt signal conditioning circuit includes an amplifier coupled with the anode of the shunt, the amplifier is coupled with a current output chip, and the current output chip is coupled with the PID controller.
As a preferred technical solution, the first three-phase rectifier bridge group and the second three-phase rectifier bridge group are both connected in parallel with a resistance-capacitance protection circuit.
As a preferred technical solution, the rc protection circuit includes a resistor and a capacitor connected in series.
As a preferable technical solution, the first three-phase rectifier bridge group and the second three-phase rectifier bridge group are both silicon controlled rectifiers.
As a preferred technical solution, the voltage zero signal sampling circuit includes an ac transformer and an optical coupler that are coupled in sequence, the ac transformer is coupled to a one-phase circuit of the three-phase ac power supply, and the optical coupler is coupled to the thyristor trigger module.
The utility model has the advantages of that:
the utility model discloses can pour into periodic pulsating current into for solenoid when solenoid demagnetization unloads the ore deposit, produce periodic pulsating magnetic field under the pulsating current effect, pulsating magnetic field acts on the medium net piece and can make the medium net piece become wavy "swing", at this moment, the high pressure water can fully pierce through the tailing of adsorbing on the medium net, do not keep "dead angle", the work efficiency of electromagnetic paste magnet separator has been improved, the artifical maintenance cycle of medium net piece has been prolonged, also can make magnetic separation concentrate grade obtain promoting simultaneously.
Drawings
FIG. 1 is a main circuit topology structure diagram of a magnetic separator of an electromagnetic slurry machine;
FIG. 2 is a block diagram of the signal conditioning circuit of the shunt of FIG. 1;
FIG. 3 is a block diagram of the system control of FIG. 1;
FIG. 4 is a topology diagram of a voltage zero signal sampling circuit;
fig. 5 is the schematic diagram of the pulse angle and the fitted magnetic field curve during operation of the present invention.
Detailed Description
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1-5, an embodiment of a magnetic pulse ore discharging circuit for an electromagnetic slurry magnetic separator according to the present invention includes a three-phase ac power source (U, V, W), a three-phase transformer (T1), an ac reactor (L1, L2, L3), a first three-phase rectifier bridge group (VT1, VT2, VT3), a shunt (FL), an electromagnetic coil (Z1), and a second three-phase rectifier bridge group (VT4, VT5, VT 6); the alternating-current reactors (L1, L2 and L3) are coupled with a power capacitor (C1), and the power capacitor (C1) is coupled with the second three-phase rectifier bridge group (VT4, VT5 and VT 6); the current divider (FL) is coupled with a current divider signal conditioning circuit, the current divider signal conditioning circuit is coupled with a PID controller, and the PID controller is respectively coupled with the first three-phase rectifier bridge group (VT1, VT2, VT3) and the second three-phase rectifier bridge group (VT4, VT5, VT 6); silicon controlled trigger modules are respectively coupled between the PID controller and the first three-phase rectifier bridge group (VT1, VT2, VT3) and between the PID controller and the second three-phase rectifier bridge group (VT4, VT5, VT 6); each phase circuit of the three-phase alternating current power supply (U, V, W) is coupled with a voltage zero signal sampling circuit, the voltage zero signal sampling circuit is coupled with the silicon controlled rectifier trigger module, the alternating current transformer (T2) and the optical coupler which are sequentially coupled with the voltage zero signal sampling circuit are coupled with one phase circuit of the three-phase alternating current power supply (U, V, W), the optical coupler is coupled with the silicon controlled rectifier trigger module, the number of the voltage zero signal sampling circuits is three, and phase voltage zero-crossing signals of each phase circuit of the three-phase alternating current power supply (U, V, W) can be recorded respectively.
As shown in fig. 1-3, a three-phase alternating current power supply (U, V, W) transmits alternating current to alternating current reactors (L1, L2, L3) through a three-phase transformer (T1), high-order harmonics in the alternating current are filtered out through the alternating current reactors (L1, L2, L3), the alternating current is rectified into direct current through a first three-phase rectifier bridge group (VT1, VT2, VT3), and the direct current power supplies power to an electromagnetic coil (Z1) through a current divider (FL), so that the electromagnetic slurry magnetic separator generates a stable magnetic field to sort impurities; when the electromagnetic coil (Z1) is electrified and magnetized, the power capacitor (C1) is used for rectifying reactive power compensation so as to improve the power factor; when the electromagnetic coil (Z1) discharges, counter electromotive force is generated, the internal energy of the electromagnetic coil (Z1) is actively inverted into the power capacitor (C1) from the negative electrode of the electromagnetic coil (Z1) through the second three-phase rectifier bridge group (VT4, VT5 and VT6), the demagnetization time is saved by adopting an active inversion discharge demagnetization method, the working efficiency of the equipment is improved, the electric energy in the electromagnetic coil (Z1) is effectively recycled, meanwhile, the internal energy of the electromagnetic coil (Z1) is inverted into the power capacitor (C1), energy can be stored for the next power-up and magnetization process, and the electric impact current when the first three-phase rectifier bridge group (VT1, VT2 and VT3) works is further reduced.
It should be noted that, as shown in fig. 1 and fig. 3, the first three-phase rectifier bridge group (VT1, VT2, VT3) and the second three-phase rectifier bridge group (VT4, VT5, VT6) are both set as silicon controlled rectifiers, each silicon controlled rectifier has a control electrode, and the PID controller controls the control electrode of the silicon controlled rectifier by sending a trigger signal through the silicon controlled trigger module, that is, the on-off of the silicon controlled rectifier can be effectively controlled.
In this embodiment, as shown in fig. 2, the shunt signal conditioning circuit includes an amplifier coupled to the positive electrode of the shunt, the amplifier is coupled with a current output chip, and the current output chip is coupled to the PID controller; in practical use, when current passes through the current divider (FL), the current divider (FL) can generate 0-75MV direct current signals along with the magnitude of the current value, the 0-75MV direct current signals are converted into linear 4-20MA current signals after passing through an amplifier and a current output chip, and the 4-20MA current signals are input into an analog quantity channel of a PID controller; specifically, the model of the current output chip may be XTR 111.
In this embodiment, as shown in fig. 1 and fig. 3, the first three-phase bridge rectifier set (VT1, VT2, VT3) and the second three-phase bridge rectifier set (VT4, VT5, VT6) are both connected in parallel with a resistance-capacitance protection circuit, and specifically, the resistance-capacitance protection circuit includes a resistor (R1, R2, R3, R4, R5, R6) and a capacitor (C2, C3, C4, C5, C6, C7) which are respectively connected in series; the silicon controlled rectifiers correspond to the resistance-capacitance protection circuits one by one, and the resistance-capacitance protection circuits can effectively prevent the silicon controlled rectifiers from being broken down by overvoltage at the moment of connection and disconnection.
In this embodiment, the PID controller reads the current signal of 4-20MA and the current value set by the user into PID operation, as shown in FIG. 3. When the electromagnetic coil (Z1) needs to be electrified and magnetized, the linear inverse proportion relation exists between the current signal and the pulse sending angle of the silicon controlled trigger module, and specifically, when the current signal is 20MA, the pulse sending angle of the silicon controlled trigger module is 0 degree; when the current signal is 4MA, the pulse sending angle of the silicon controlled trigger module is 180 degrees, at the moment, the PID controller only outputs a current signal of 12-20MA to the silicon controlled trigger module according to a current value set by a user, the pulse of the silicon controlled trigger module works in a rectification area (0-90 degrees), the actual current value quickly follows the current value set by the user, and in the rising process of the current, if the actual current value is higher than the upper limit value of the PID controller, the PID controller can ensure that the actual current flowing through the electromagnetic coil (Z1) does not exceed the upper limit value of the set current in the process of magnetizing the electromagnetic coil (Z1) or the condition of a power grid changes by reducing the P value and increasing the I value, so that the electromagnetic coil (Z1) can be quickly and accurately magnetized when needing to be magnetized, and the complicated power grid condition can be coped with. When the electromagnetic coil (Z1) is discharged and demagnetized, the PID controller outputs a current signal of 4-12MA to the silicon controlled trigger module, so that the pulse of the silicon controlled trigger module works in an active inversion region (90-180 degrees).
In the present embodiment, as shown in fig. 3 to 5, the voltage zero-point signal sampling circuit sends the recorded phase voltage zero-crossing signal of each phase circuit of the three-phase ac power supply (U, V, W) to the scr trigger module, and under the control of the PID controller, the scr trigger module controls the pulse sending angle through the scr on each phase circuit of the three-phase ac power supply (U, V, W), specifically, a pulse signal with an angle of 89 degrees is output from the first zero-crossing point of the U-phase, a pulse signal with an angle of 88 degrees is output from the first zero-crossing point of the V-phase, a pulse signal with an angle of 87 degrees is output from the first zero-crossing point of the W-phase, the trigger pulse angle is sequentially decreased from the next zero-crossing point of the U-phase, and so on, until the pulse angle is decreased to 40 degrees, the three-phase ac power supply (U, U) is sequentially increased from the next zero-crossing point, V, W) until the angle is increased to 89 degrees, the silicon controlled trigger module stops pulse output, the pulsating magnetic field stops for 8 seconds, one pulsating magnetic field period of the ore unloading stage is finished, the next cycle period is started, the silicon controlled trigger module outputs a pulse signal with the angle of 89 degrees from the first zero crossing point of the U-phase of the three-phase alternating current power supply (U, V, W), and the magnetic pulsation periods are repeated in sequence until the ore unloading time is finished. The utility model discloses can pour into periodic pulsating current into for solenoid when solenoid demagnetization unloads the ore deposit, produce periodic pulsating magnetic field under the pulsating current effect, pulsating magnetic field acts on the medium net piece and can make the medium net piece become wavy "swing", at this moment, the high pressure water can fully pierce through the tailing of adsorbing on the medium net, do not keep "dead angle", the work efficiency of electromagnetic paste magnet separator has been improved, the artifical maintenance cycle of medium net piece has been prolonged, also can make magnetic separation concentrate grade obtain promoting simultaneously.
It should be noted that when the electromagnetic slurry magnetic separator is in normal operation, the magnetic field intensity in the cavity is usually about 5W gauss (Gs), so that the medium mesh has strong magnetism capable of adsorbing magnetic impurities; in the ore unloading stage, the highest magnetic field intensity of the periodic pulsating magnetic field generated by the pulsating current only needs to reach 5000 gauss (Gs), so that the medium mesh can be waved and 'swung', at the moment, the magnetism generated by the medium mesh under the action of the pulsating magnetic field is not enough to adsorb magnetic impurities, and the pause of 8 seconds exists between two magnetic pulsation periods, so that the magnetic impurities can not be washed off from the medium mesh by high-pressure water.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A magnetic pulse ore unloading circuit for an electromagnetic slurry magnetic separator is characterized by comprising a three-phase alternating current power supply, a three-phase transformer, an alternating current reactor, a first three-phase rectifier bridge group, a current divider, an electromagnetic coil and a second three-phase rectifier bridge group which are coupled in sequence; the alternating current reactor is coupled with a power capacitor, and the power capacitor is coupled with the second three-phase rectifier bridge group; the current divider is coupled with a current divider signal conditioning circuit, the current divider signal conditioning circuit is coupled with a PID controller, and the PID controller is respectively coupled with the first three-phase rectifier bridge group and the second three-phase rectifier bridge group; silicon controlled trigger modules are respectively coupled between the PID controller and the first three-phase rectifier bridge group and between the PID controller and the second three-phase rectifier bridge group; and each phase circuit of the three-phase alternating current power supply is coupled with a voltage zero signal sampling circuit, and the voltage zero signal sampling circuit is coupled with the silicon controlled rectifier triggering module.
2. The magnetic pulse ore discharge circuit of claim 1, wherein the shunt signal conditioning circuit comprises an amplifier coupled to the positive electrode of the shunt, the amplifier is coupled to a current output chip, and the current output chip is coupled to the PID controller.
3. The magnetic pulse ore discharging circuit for the electromagnetic slurry magnetic separator as claimed in claim 1, wherein the first three-phase rectifier bridge group and the second three-phase rectifier bridge group are connected in parallel with a resistance-capacitance protection circuit.
4. The magnetic pulse ore discharge circuit for the electromagnetic slurry magnetic separator as claimed in claim 3, wherein the resistance-capacitance protection circuit comprises a resistor and a capacitor connected in series.
5. The magnetic pulse ore discharging circuit for the electromagnetic slurry magnetic separator as claimed in claim 1, wherein said first three-phase rectifier bridge group and said second three-phase rectifier bridge group are both silicon controlled rectifiers.
6. The magnetic pulse ore discharge circuit for the electromagnetic slurry magnetic separator according to claim 1, wherein the voltage zero signal sampling circuit comprises an alternating current transformer and an optical coupler which are coupled in sequence, the alternating current transformer is coupled with a one-phase circuit of the three-phase alternating current power supply, and the optical coupler is coupled with the silicon controlled rectifier trigger module.
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| CN202121431429.8U CN214799322U (en) | 2021-06-26 | 2021-06-26 | Magnetic pulse ore discharging circuit for electromagnetic slurry magnetic separator |
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| CN202121431429.8U CN214799322U (en) | 2021-06-26 | 2021-06-26 | Magnetic pulse ore discharging circuit for electromagnetic slurry magnetic separator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115055281A (en) * | 2022-06-24 | 2022-09-16 | 沈阳隆基电磁科技股份有限公司 | Electromagnetic oscillation iron unloading circuit and electromagnetic oscillation iron unloading method of electromagnetic iron remover |
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2021
- 2021-06-26 CN CN202121431429.8U patent/CN214799322U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115055281A (en) * | 2022-06-24 | 2022-09-16 | 沈阳隆基电磁科技股份有限公司 | Electromagnetic oscillation iron unloading circuit and electromagnetic oscillation iron unloading method of electromagnetic iron remover |
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