CN112201431A - Online demagnetization circuit of quick response bearing ring - Google Patents
Online demagnetization circuit of quick response bearing ring Download PDFInfo
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- CN112201431A CN112201431A CN202011120580.XA CN202011120580A CN112201431A CN 112201431 A CN112201431 A CN 112201431A CN 202011120580 A CN202011120580 A CN 202011120580A CN 112201431 A CN112201431 A CN 112201431A
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- demagnetization
- branch
- bearing ring
- voltage
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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
- H01F13/006—Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material
Abstract
The invention relates to an online demagnetization circuit of a quick response bearing ring, belonging to the technical field of bearing manufacture, comprising an electronic starting circuit, a time delay control circuit and a voltage-controlled voltage regulator, wherein the electronic starting circuit comprises: the primary side starting branch is provided with a proximity switch, a photoelectric coupler and a first resistor in series, and the proximity switch is arranged on a discharging channel of the discharging mechanical device; the secondary side starting branch is connected with the output end of the photoelectric coupler, a second resistor and a switching tube in series, the base electrode of the secondary side starting branch is connected with the second resistor, and the collector electrode of the secondary side starting branch is connected with a power supply; the time delay control circuit comprises a charging branch and a discharging branch which are connected in parallel, a capacitive element is arranged in the charging branch in series, and the capacitive element is connected with an emitter of the switching tube; the low-voltage input end of the voltage-controlled voltage regulator is connected with the capacitive element, and the output end of the voltage-controlled voltage regulator is connected with the demagnetization coil. The demagnetization circuit can enable the bearing ring to be in a demagnetization coil, and the magnetism of the bearing ring is eliminated under the condition of the magnetic field intensity as large as possible, so that the effective and reliable demagnetization is realized.
Description
Technical Field
The invention belongs to the technical field of bearing manufacturing, and particularly relates to an online demagnetization circuit of a quick response bearing ring.
Background
The full-automatic bearing production line is widely used in the bearing manufacturing industry, and many grinding devices on the bearing production line use an electromagnetic coreless fixture as a tool for supporting a bearing ring and adsorb the bearing ring on a magnetic pole for grinding. After the grinding processing is finished, partial residual magnetism is remained on the bearing ring, the bearing ring can be moved into the discharging channel by the discharging mechanical device, the bearing ring can roll downwards along the inclined discharging channel and enters the demagnetizing device for demagnetization, and the bearing ring automatically leaves the demagnetizing device after the magnetism of the bearing ring is eliminated and enters the next processing procedure.
At present, the demagnetization mode of a full-automatic bearing production line is a coil decreasing type demagnetization mode, the principle of the demagnetization mode is that the demagnetization mode consists of a large coil, a medium coil and a small coil, a bearing ring achieves the demagnetization effect of gradually attenuating a magnetic field through a plurality of coils with different wire diameters and different turns, and after demagnetization, the dispersion of residual magnetic values of each bearing ring is large, the residual magnetic exceeding rate is high, and energy is not saved.
In addition, there is also a demagnetization mode controlled by an electronic circuit, for example, chinese patent application publication No. CN104538150A, which proposes a bearing ring demagnetization device, the device includes a CPU unit, a first/second driving circuit, a first/second layer coil, a sensor, a data input and display unit, etc., and the device has the disadvantages of complicated circuit, high manufacturing cost, high failure rate, and difficult maintenance. Similar to other electronic control demagnetization circuits, when the bearing ring passes through the demagnetization coil, the response of the trigger circuit and the demagnetization coil is not matched properly or the demagnetization response is not appropriate, so that the technical requirement of the bearing ring cannot be met due to demagnetization.
Disclosure of Invention
The invention aims to provide an online demagnetization circuit of a quick response bearing ring, which is used for solving the problem of poor demagnetization effect of the conventional demagnetization device.
Based on the purpose, the technical scheme of the online demagnetization circuit of the quick response bearing ring is as follows:
the device comprises an electronic starting circuit, a time delay control circuit and a voltage-controlled voltage regulator, wherein the electronic starting circuit comprises a primary side starting branch and a secondary side starting branch, a proximity switch, a photoelectric coupler and a first resistor are serially arranged in the primary side starting branch, and the proximity switch is arranged on a discharging channel of a discharging mechanical device and is arranged on one side of a bearing ring inlet of a demagnetization coil; the output end of the photoelectric coupler, a second resistor and a switching tube are serially arranged in the secondary side starting branch, the base electrode of the switching tube is connected with the second resistor, and the collector electrode of the switching tube is used for being connected with a power supply;
the delay control circuit comprises a charging branch and a discharging branch, the charging branch and the discharging branch are connected in parallel, a capacitive element is connected in series in the charging branch, and the capacitive element is connected with an emitter of the switching tube;
the low voltage input end of the voltage-controlled voltage regulator is connected with the capacitive element, the high voltage input end of the voltage-controlled voltage regulator is used for connecting an alternating current power supply, and the output end of the voltage-controlled voltage regulator is connected with a demagnetization coil and used for generating a demagnetization magnetic field of the bearing ring.
The beneficial effects of the above technical scheme are:
the demagnetization circuit can eliminate the magnetism of the bearing ring in the demagnetization coil under the state of the magnetic field intensity as large as possible when the bearing ring passes through the proximity switch in the rolling and sliding process of the blanking channel, the response speed of the magnetic field is high, the demagnetization circuit can be triggered quickly, the magnetic force of the magnetic field is gradually attenuated and loses the constraint on the bearing ring after the bearing ring is demagnetized in the demagnetization coil, and the bearing ring can automatically roll to the next process along the blanking channel. The online demagnetization circuit has stable working performance and strong working reliability, and the circuit can respond quickly, so that the residual magnetic value of the demagnetized bearing ring can meet the process requirement, and the demagnetization effect is good. The starting of the proximity switch trigger circuit is completed in the moment when the demagnetization coil reaches the required magnetic field intensity, and the bearing ring rolling downwards is prevented from entering the demagnetization coil, so that the demagnetization coil cannot reach a normal demagnetization state after response delay to influence the demagnetization effect.
Furthermore, a potentiometer is serially arranged in the discharging branch, and discharging time (namely demagnetization time) is controlled by adjusting the size of the potentiometer so as to adapt to effective demagnetization of bearing rings of different models.
In other embodiments, a third resistor is connected in series in the discharge branch for effective demagnetization of a bearing ring of a fixed model. As another embodiment, the potentiometer and the third resistor may be connected in series in the discharge branch.
Furthermore, a power supply connected with a collector of the switch tube is an integrated power supply in the voltage-controlled voltage regulator, so that the component composition of a demagnetization circuit is reduced, and the cost is reduced.
Drawings
Fig. 1 is a circuit diagram of online demagnetization in an embodiment of the present invention;
FIG. 2 is a schematic view of the on-line demagnetization of the bearing ring in the embodiment of the invention;
fig. 3 is a plan view of the bearing ring in an embodiment of the present invention in an operating state of online demagnetization (i.e., a view a-a of fig. 2);
the reference numerals in fig. 1 are explained as follows:
the circuit comprises a Y-voltage-controlled voltage regulator, a K-proximity switch, a G-photoelectric coupler, R1, R2, R3-resistors, a C-capacitor, a T-triode, a W-potentiometer and an L-demagnetization coil;
the reference numerals in fig. 2 and 3 are explained as follows:
1-bearing ring, 2-demagnetization coil, 3-demagnetization circuit, 4-blanking channel and 5-proximity switch.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The present embodiment provides an online demagnetization circuit of a fast response bearing ring, and the structure of the circuit is shown in fig. 1, and the circuit includes an electronic start circuit, a delay control circuit, a voltage-controlled voltage regulator Y, and a demagnetization coil L. The electronic starting circuit comprises a primary side starting branch and a secondary side starting branch, wherein a proximity switch K (namely a position switch), an input end of a photoelectric coupler G and a resistor R1 are connected in series on the primary side starting branch, and the proximity switch is used for being arranged on the side edge of a discharging channel of the discharging mechanical device, namely on the side of an inlet of a bearing ring of the demagnetization coil; the output end of the photoelectric coupler G, the resistor R2 and the triode T are arranged on the secondary side starting branch in series, the base electrode of the triode T is connected with the resistor R2, and the collector electrode and the anode of the diode (namely the anode of the output end) in the photoelectric coupler G are connected to a +12V power supply, in the embodiment, the power supply is taken from the +12V power supply end of the voltage-controlled voltage regulator Y. As another embodiment, a power supply module may be specially configured to supply power to the electronic start-up circuit.
The time delay control circuit comprises a charging branch and a discharging branch, wherein a capacitor C is arranged in the charging branch in series, a potentiometer W and a resistor R3 are arranged in the discharging branch in series, after the charging branch and the discharging branch are connected in parallel, one end of the charging branch is connected with a low-voltage input end (which is 0-5V direct-current voltage) of the voltage-controlled voltage regulator Y, and the other end of the charging branch is connected with a ground end COM of the voltage-controlled voltage regulator Y.
And for the voltage-controlled voltage regulator Y, two groups of input ends and one group of output ends are arranged, the input ends comprise a low-voltage input end and a high-voltage input end, the low-voltage input end is used for connecting a delay control circuit, the high-voltage input end is used for connecting a 220V alternating-current power supply, and the output end is connected with the demagnetization coil L. In this embodiment, the demagnetization coil L is disposed at the grinding and blanking position, and the blanking channel penetrates through the demagnetization coil, and the two cooperate with each other to provide a space for demagnetizing in the magnetic field for the bearing ring rolling downward along the blanking channel.
The working principle of the voltage-controlled voltage regulator is as follows: when the control voltage of the input end is 0V, the output voltage of the voltage-controlled voltage regulator is 0V; when the control voltage of the input end is +5V, the output voltage of the voltage-controlled voltage regulator is 220V; when the control voltage is increased from 0V to +5V, the output voltage of the voltage-controlled voltage regulator is increased from 0V to 220V, and the voltage at two ends of the demagnetization coil is also increased from 0V to 220V; when the control voltage is reduced from +5V to 0V, the output voltage of the voltage-controlled voltage regulator is also reduced from 220V to 0V, and the voltage at two ends of the demagnetization coil is also reduced from 220V to 0V.
The implementation principle of the demagnetization circuit 3 is described below with reference to the demagnetization application scenarios of the bearing ring shown in fig. 2 and 3:
when the bearing ring 1 is magnetically processed from the grinding machine, enters the blanking channel 4 and rolls downwards to move forwards, an electronic starting circuit is conducted through a proximity switch K (5), current flows from a +12V power supply through the proximity switch K (5), a photoelectric coupler G and a resistor R1 to a ground end COM, then an output end of the photoelectric coupler G flows to a base electrode b of a triode T through a resistor R2, the triode T is conducted in a saturated mode, an emission stage e of the triode T charges a capacitor C in a charging branch circuit, voltage at two ends of the capacitor C rises rapidly, input voltage of a trigger voltage-controlled voltage regulator Y rises from 0V to 5V, voltage on an output end electromagnetic coil L (2) of the voltage-controlled voltage regulator Y is instantly increased from alternating current 0V to 220V, and the voltage at an input end and an output end rises to play roles in voltage regulation (namely voltage control) and buffering protection of the electromagnetic coil L, avoid the big current impact of solenoid L.
The time from the moment that the bearing ring 1 triggers the proximity switch K (5) to the moment that the demagnetization coil L (2) enters a current conduction demagnetization working state is very short, and the response speed is very high. The bearing ring 1 enters the electromagnetic coil L (2) and is magnetically attracted therein by the electromagnetic coil L (2).
When the bearing ring 1 leaves the proximity switch K (5), the proximity switch K (5) is switched off, the photoelectric coupler G is cut off, the triode T is also cut off, the capacitor C discharges to the potentiometer W and the resistor R3 in the discharging branch, and the voltage on the capacitor C is gradually reduced from 5V. In this embodiment, the discharge time τ of the capacitor C is equal to C (W + R3), and the discharge time, that is, the time required for the terminal voltage of the demagnetization coil L (2) to decrease from 220V to 0V is set according to the demagnetization time required for the bearing rings of different types.
When the electromagnetic force of the demagnetization coil L (2) is smaller than the downward sliding force of the bearing ring 1, the bearing ring 1 rolls out of the electromagnetic coil L (2), and the magnetism of the bearing ring 1 is eliminated.
The whole demagnetization process can be simplified into the following six steps:
1) the bearing ring is processed and then enters the blanking channel to roll forward;
2) triggering a proximity switch, and quickly and softly starting the current of the demagnetization coil;
3) the bearing ring enters the demagnetization coil;
4) the bearing ring is demagnetized in the demagnetization coil;
5) discharging the capacitor, and alternately attenuating the magnetic field of the demagnetizing coil;
6) and the bearing ring rolls away from the demagnetization coil, and after demagnetization is finished, the bearing ring enters the next processing procedure.
In this embodiment, the demagnetization coil is a component that generates a demagnetization field, and is manufactured according to technical parameters such as the size and specification of the bearing ring to be demagnetized. After the power is switched on, the bearing ring is demagnetized in a magnetic field in the demagnetization coil, and when the current is reduced to the point that the bearing ring cannot be restrained to stay in the coil, the bearing ring can automatically roll out along the inclined discharging channel through the demagnetization coil.
In the electronic starting circuit of this embodiment, the switching tube serially connected to the secondary side starting circuit is a triode, and as another embodiment, another switching tube, such as a MOS tube or an IGBT, may also be used.
In the delay control circuit of this embodiment, the resistive elements connected in series to the discharge branch are a potentiometer and a resistor R3, and as other embodiments, the potentiometer or the resistor may be used alone, but the difference is that when the potentiometer is used alone, effective demagnetization of bearing rings of various types can still be achieved by adjusting the potentiometer; when the resistor is independently adopted, the resistance value cannot be adjusted, and the effective demagnetization of the bearing ring with a fixed model can be realized.
The demagnetization circuit of the invention has the following characteristics:
(1) the electronic starting circuit and the time delay control circuit are used for rapidly triggering the voltage-controlled voltage regulating circuit. The reason is that because the demagnetization coil is an inductive load, the starting current of the coil is several times of the normal running current at the moment of electrifying, so that impact and damage are generated on the demagnetization circuit and the demagnetization coil, the starting speed is slow, the bearing ring cannot timely enter the optimal state for demagnetization, and the process requirements cannot be met. Therefore, the electronic starting circuit and the time delay control circuit are arranged when demagnetization is started, so that a very short soft starting measure is provided, and the demagnetization time can be controlled to control the time of demagnetization attenuation.
(2) The voltage-controlled voltage regulator is used for providing current for generating a magnetic field for the electromagnetic coil, so that the electronic starting circuit and the time-delay control circuit control the change of the magnetic field of the demagnetization coil through the voltage-controlled voltage regulator to achieve the purpose of eliminating residual magnetism of the bearing ring, namely, the change of direct-current voltage at the input end is used for controlling the change of alternating-current voltage at two ends of the demagnetization coil at the output end.
In conclusion, when the bearing ring passes through the proximity switch, the demagnetization circuit is started by induction, the magnetic field intensity in the demagnetization coil can quickly reach a set value, the coil is in a demagnetization current conduction state required by work, the bearing ring entering the demagnetization coil is demagnetized by a strong magnetic field, the process of alternating attenuation of the magnetic field is also the process of online demagnetization of the bearing ring, the bearing ring can slowly roll away from the magnetic field after demagnetization, the effects of quick start and effective demagnetization are achieved, and the reliability is high.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (3)
1. An online demagnetization circuit of a quick response bearing ring is characterized by comprising an electronic starting circuit, a time delay control circuit and a voltage-controlled voltage regulator, wherein the electronic starting circuit comprises a primary starting branch and a secondary starting branch, a proximity switch, a photoelectric coupler and a first resistor are connected in series in the primary starting branch, and the proximity switch is arranged on a discharging channel of a discharging mechanical device and on one side of a bearing ring inlet of a demagnetization coil; the output end of the photoelectric coupler, a second resistor and a switching tube are serially arranged in the secondary side starting branch, the base electrode of the switching tube is connected with the second resistor, and the collector electrode of the switching tube is used for being connected with a power supply;
the delay control circuit comprises a charging branch and a discharging branch, the charging branch and the discharging branch are connected in parallel, a capacitive element is connected in series in the charging branch, and the capacitive element is connected with an emitter of the switching tube;
the low voltage input end of the voltage-controlled voltage regulator is connected with the capacitive element, the high voltage input end of the voltage-controlled voltage regulator is used for connecting an alternating current power supply, and the output end of the voltage-controlled voltage regulator is connected with a demagnetization coil and used for generating a demagnetization magnetic field of the bearing ring.
2. An on-line demagnetization circuit of a fast response bearing ring as recited in claim 1 wherein a potentiometer and/or a third resistor are serially connected in said discharge branch.
3. The on-line demagnetization circuit of a fast response bearing ring as claimed in claim 1, wherein the power supply connected to the collector of the switching tube is an integrated power supply in the voltage-controlled voltage regulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011120580.XA CN112201431B (en) | 2020-10-19 | 2020-10-19 | Online demagnetization circuit of quick response bearing ring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011120580.XA CN112201431B (en) | 2020-10-19 | 2020-10-19 | Online demagnetization circuit of quick response bearing ring |
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| CN112201431A true CN112201431A (en) | 2021-01-08 |
| CN112201431B CN112201431B (en) | 2022-02-11 |
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| CN202011120580.XA Active CN112201431B (en) | 2020-10-19 | 2020-10-19 | Online demagnetization circuit of quick response bearing ring |
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| CN1529515A (en) * | 2003-10-08 | 2004-09-15 | 深圳创维－Rgb电子有限公司 | External demagnetizing method and device |
| US20060066973A1 (en) * | 2004-09-30 | 2006-03-30 | Agere Systems Inc. | Write head demagnetizer |
| CN101552086A (en) * | 2008-12-26 | 2009-10-07 | 洛阳轴研科技股份有限公司 | Multi-functional circuit design for energy conservation of bearing demagnetization machine |
| CN101552085A (en) * | 2008-12-26 | 2009-10-07 | 洛阳轴研科技股份有限公司 | Method and circuit configuration for self-demagnetization of bearing after induction heating |
| CN202258635U (en) * | 2011-09-13 | 2012-05-30 | 威海铁鹰数控有限公司 | Magnetizing and demagnetizing controller for electromagnetic chuck of grinder |
| CN104538150A (en) * | 2014-12-18 | 2015-04-22 | 河南机电高等专科学校 | Bearing ring demagnetizing device |
| CN105093140A (en) * | 2015-08-19 | 2015-11-25 | 国网四川省电力公司阿坝供电公司 | Transformer remanence detection and demagnetization method and device |
| CN108247539A (en) * | 2017-12-30 | 2018-07-06 | 襄阳福坦铁路轴承有限公司 | A kind of magnetising or demagnetising apparatus of grinding machine |
-
2020
- 2020-10-19 CN CN202011120580.XA patent/CN112201431B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1529515A (en) * | 2003-10-08 | 2004-09-15 | 深圳创维－Rgb电子有限公司 | External demagnetizing method and device |
| US20060066973A1 (en) * | 2004-09-30 | 2006-03-30 | Agere Systems Inc. | Write head demagnetizer |
| CN101552086A (en) * | 2008-12-26 | 2009-10-07 | 洛阳轴研科技股份有限公司 | Multi-functional circuit design for energy conservation of bearing demagnetization machine |
| CN101552085A (en) * | 2008-12-26 | 2009-10-07 | 洛阳轴研科技股份有限公司 | Method and circuit configuration for self-demagnetization of bearing after induction heating |
| CN202258635U (en) * | 2011-09-13 | 2012-05-30 | 威海铁鹰数控有限公司 | Magnetizing and demagnetizing controller for electromagnetic chuck of grinder |
| CN104538150A (en) * | 2014-12-18 | 2015-04-22 | 河南机电高等专科学校 | Bearing ring demagnetizing device |
| CN105093140A (en) * | 2015-08-19 | 2015-11-25 | 国网四川省电力公司阿坝供电公司 | Transformer remanence detection and demagnetization method and device |
| CN108247539A (en) * | 2017-12-30 | 2018-07-06 | 襄阳福坦铁路轴承有限公司 | A kind of magnetising or demagnetising apparatus of grinding machine |
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| CN112201431B (en) | 2022-02-11 |
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