CN201259811Y - Demagnetizer for adhering Nd-Fe-B magnet - Google Patents
Demagnetizer for adhering Nd-Fe-B magnet Download PDFInfo
- Publication number
- CN201259811Y CN201259811Y CNU2008200598161U CN200820059816U CN201259811Y CN 201259811 Y CN201259811 Y CN 201259811Y CN U2008200598161 U CNU2008200598161 U CN U2008200598161U CN 200820059816 U CN200820059816 U CN 200820059816U CN 201259811 Y CN201259811 Y CN 201259811Y
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- demagnetization
- iron
- demagnetizer
- tube
- demagnetizing
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Abstract
The utility model relates to a magnet demagnetizing device. The demagnetizing device for a bonded NdFeB magnet comprises a demagnetizing drum, an inductive heating coil sleeved at the outer side of the demagnetizing drum and a power-frequency coil sleeved at the outer side of the heating coil; wherein the left end and the right end of the demagnetizing drum are respectively provided with a left cover and a right cover; an air intake pipe is arranged at the upper part of the demagnetizing drum; an air outlet pipe is arranged at the lower part of the demagnetizing drum; and a metal lead rail is arranged inside the demagnetizing drum. The demagnetizing device is simple in structure, and when to demagnetizing the bonded NdFeB magnet, a user only needs to put the bonded NdFeB magnet into the demagnetizing drum and heats the demagnetizing drum through high-frequency electromagnetic field to heat the bonded NdFeB magnet to 350-450DEG C in a short time and at the same time import inert gas nitrogen into the demagnetizing drum. In this way, magnet demagnetization efficiency can be improved and oxidation of the magnet can be prevented.
Description
Technical field
The utility model relates to a kind of demagnetizer of magnet.
Background technology
Agglutinate neodymium-iron-boron magnet is the permanent magnetic material of a new generation, has obtained very widely in a lot of fields such as electronics, automobile and has used.In the Agglutinate neodymium-iron-boron magnet commercial process,, need therefore, need do demagnetization to these magnetized magnets and handle bonded permanent magnet such as defective products, waste product and the broken product recycling thereof of having magnetized in order to save cost.On the magnetics principle, can make the magnet demagnetization by applying the demagnetizing field that is higher than the magnet HCJ, because the HCJ Hcj of Agglutinate neodymium-iron-boron magnet is between 640～1200kA/m, has higher HCJ than ferrite permanent magnet, samarium cobalt permanent magnet body etc., therefore, in order to realize demagnetization, need provide very high demagnetizing field.In addition, can also be by the way of heating, heating-up temperature surpasses the Curie temperature of magnet, thereby makes the inner magnetic phase transition that takes place of magnet, reaches the purpose of demagnetization fully.Utilize the method for heating to make the magnet demagnetization, need consider and contain metal dust in the Agglutinate neodymium-iron-boron magnet, should prevent oxidation in the high temperature demagnetization process.
Concrete demagnetizing method mainly contains following several:
The rotating permanent magnet demagnetizing method, utilization is arranged in the magnetic field demagnetization that magnetic roller rotation that permanent magnet material together makes produces, as Chinese patent 02204294.6 " axially through type permanent magnetism demagnetizer ", the magnetic roller that utilizes permanent magnet to make, at the drive backspin of the motor living alternating magnetic field of changing the line of production, make the magnet demagnetization.But, at present all permanent magnets demagnetizing field peak that can produce have only Agglutinate neodymium-iron-boron HCJ 1/3, therefore can not make the Agglutinate neodymium-iron-boron magnet demagnetization to neutral.
Friendship, straight changed electric field demagnetizing method, the oscillating magnetic field of utilizing the alternating current-direct current electric field to produce is opposite to the magnet demagnetization in the magnetic field.Chinese patent 200420018510.3 " demagnetizer that contains the oscillating circuit that demagnetizes " for example, this device comprises the demagnetization oscillating circuit, can obtain the enough wave numbers and the demagnetizing field of lapse rate, and permanent magnet is demagnetized fully.But, as described above, seek out the needed demagnetizing field intensity of Agglutinate neodymium-iron-boron magnet, the power that needs is very big, and degaussion coil also can produce very big heat, considers the problem of energy consumption and heat radiation, if utilize this method to demagnetize for Agglutinate neodymium-iron-boron magnet, cost can be than higher.
The utility model content
The purpose of this utility model is exactly to overcome the above-mentioned defective that prior art exists, and provides a kind of demagnetizer of Agglutinate neodymium-iron-boron magnet, to satisfy the needs of relevant branch of industry.
The demagnetizer of Agglutinate neodymium-iron-boron magnet of the present utility model comprises:
Demagnetization tube, be enclosed within the outside load coil of demagnetization tube and be enclosed within the power frequency coil of heater coil outside, wherein:
The two ends, the left and right sides of demagnetization tube are respectively equipped with Zuo Gai and You Gai;
Demagnetization tube top is provided with air inlet pipe, and the bottom is provided with escape pipe;
Be provided with metal guide rail in the demagnetization tube.
The demagnetizer of above-mentioned Agglutinate neodymium-iron-boron magnet, Zuo Gai and right lid constitute sealed space with demagnetization tube stack shell.
The demagnetizer of the said Agglutinate neodymium-iron-boron magnet of the utility model, preferred scheme are the close load coils of air inlet pipe, just are heated the district; Preferred scheme is that air inlet pipe has two, lays respectively at the both sides of demagnetization tube top load coil.
The demagnetizer of above-mentioned Agglutinate neodymium-iron-boron magnet, preferred scheme also has, and escape pipe has two, lays respectively at the two ends, the left and right sides of demagnetization tube bottom.
Above-mentioned demagnetization tube, it is shaped as cylinder, and outer diameter D generally can be located at 80～120mm, and inner diameter d is 70～110mm, and the length H of cylinder is 300～700mm.Preferred demagnetization tube outer diameter D is 100mm, and inner diameter d is 90mm.Material can be selected the common refractory that can buy on the market, and for example, material is earthenwares such as aluminium oxide, chromium oxide, magnesium oxide or calcium oxide.
Above-mentioned demagnetization tube, Zuo Gai and right lid can be made as copper, stainless steel or other alloys with antirust metal.Zuo Gai and You Gai are equipped with corresponding sealing ring, whole demagnetization tube sealing when covering.
During use, feed inert gas by air inlet pipe and enter the demagnetization tube, leave, remained inert gas in the tube, prevent the magnet oxidation by escape pipe.Inert gas can use technical grade nitrogen, argon gas etc., and magnet can be protected in heating process.
Above-mentioned load coil, the high-frequency induction equipment that can select for use market to buy, preferred high frequency frequency 200～300kHz, the high-frequency induction equipment of power 8～20kw.Radio-frequency induction coil can be provided by supplier, perhaps by the supplier designs coil of system matches therewith.The internal diameter of radio-frequency induction coil is than the big 10～30mm of external diameter of tube 3.
Above-mentioned power frequency coil, design is as the structure of Fig. 3.The power frequency internal coil diameter is than the big 10～30mm of external diameter of radio-frequency induction coil.Adopt the enamelled wire of diameter 1.5～2.0mm, around 300～500 circles, 220V directly inserts with civil power, and AC current control is in 10 amperes, and preferably electric current is 3～7 amperes.
The effect of power frequency coil mainly is that the magnet that is placed on the metal guide rail is shaken, thereby magnet is heated evenly.
Above-mentioned metal guide rail is regulated according to what and heated degree of magnet, and to reach 350～450 degree Celsius, heated magnet definitely can not surpass 500 degree Celsius.
Metal guide rail can adopt stainless steel material to make, and has groove, during use magnet is placed in the groove.
The beneficial effects of the utility model:
The demagnetizer of Agglutinate neodymium-iron-boron magnet described in the utility model, simple in structure, as long as with magnetized Agglutinate neodymium-iron-boron magnet (non-defective unit, defective products, waste product and broken product thereof), put into the demagnetization tube, heat with the electromagnetic field of high frequency, the heating magnet is to 350～450 degree Celsius in the short time (0.5～2 minute), and logical simultaneously inert nitrogen gas prevents the magnet surface oxidation in the demagnetization tube.The magnet demagnetization efficiency was improved, prevented oxidation again.
Description of drawings
Fig. 1 is the demagnetizer structural representation of Agglutinate neodymium-iron-boron magnet
Fig. 2 is the cross sectional representation of metal guide rail
Fig. 3 is the cross sectional representation of induction heating, power frequency coil
Embodiment
Further specify embodiment of the present utility model below in conjunction with accompanying drawing 1,2,3:
The demagnetizer of Agglutinate neodymium-iron-boron magnet described in the utility model comprises:
The two ends, the left and right sides of demagnetization tube 8 are respectively equipped with left side lid and 1 right lid 2;
Be provided with metal guide rail 7 in the demagnetization tube 8.
Relative dimensions is as follows:
Left side lid 1 and right lid 2 can be made with antirust metal (copper, stainless steel or other metals), and left side lid 1 and right lid 2 are equipped with corresponding sealing ring, and therefore whole demagnetization tube 8 is a seal cavity.
Power frequency coil 6 is designed to the structure as Fig. 3.The power frequency internal coil diameter is than the big 10～30mm of external diameter of radio-frequency induction coil.Adopt the enamelled wire of diameter 1.5～2.0mm, around 300～500 circles, 220V directly inserts with civil power, and AC current control is in 10 amperes, and preferably electric current is 3～7 amperes.
Metal guide rail 7 can adopt stainless steel material, and its cross sectional representation such as accompanying drawing 2 are placed the magnet that needs demagnetization in the groove.
The demagnetizer of above-mentioned Agglutinate neodymium-iron-boron magnet, preferred scheme are air inlet pipe 3 close load coils 5, just are heated the district; Preferred scheme is that air inlet pipe 3 has two, lays respectively at the both sides of demagnetization tube 8 top load coils 5.
The demagnetizer of above-mentioned Agglutinate neodymium-iron-boron magnet, preferred scheme also has, and escape pipe 4 has two, lays respectively at the two ends, the left and right sides of demagnetization tube 8 bottoms.
The demagnetizer of Agglutinate neodymium-iron-boron magnet of the present utility model is operation like this:
To magnetized Agglutinate neodymium-iron-boron magnet (non-defective unit, defective products, waste product and broken product thereof, the equivalent diameter of magnet is less than 60mm), put into the demagnetization cylinder metal guide rail on groove on.By the heating of radio-frequency induction coil 5, be subjected to simultaneously power frequency coil 6 power frequency electromagnetic field and shake, regulate the heating power and the heated time of radio-frequency induction coil 5, make magnet be warming up to 350～450 degree Celsius, surpass 500 degree Celsius; The time that is heated only needs 0.5～2 minute, can make the Agglutinate neodymium-iron-boron magnet demagnetization to neutral, and magnet temperature is reduced to room temperature afterwards.Inert gas uses technical grade nitrogen, enters demagnetization tube 8 by air inlet pipe 3, is left by escape pipe 4, makes in the demagnetization tube 8 to be full of inert gas all the time, prevents the magnet surface oxidation.
Claims (12)
1, a kind of demagnetizer of Agglutinate neodymium-iron-boron magnet is characterized in that: comprise demagnetization tube, be enclosed within the outside load coil of demagnetization tube and be enclosed within the power frequency coil of heater coil outside, wherein the two ends, the left and right sides of demagnetization tube are respectively equipped with Zuo Gai and You Gai;
Demagnetization tube top is provided with air inlet pipe, and the bottom is provided with escape pipe;
Be provided with metal guide rail in the demagnetization tube.
2, the demagnetizer of Agglutinate neodymium-iron-boron magnet as claimed in claim 1 is characterized in that: Zuo Gai and You Gai are equipped with corresponding sealing ring, whole demagnetization tube sealing when covering.
3, the demagnetizer of Agglutinate neodymium-iron-boron magnet as claimed in claim 1 is characterized in that: air inlet pipe has two, lays respectively at the both sides of load coil.
4, the demagnetizer of Agglutinate neodymium-iron-boron magnet as claimed in claim 1 is characterized in that: escape pipe has two, lays respectively at the two ends, the left and right sides of demagnetization tube.
5, the demagnetizer of Agglutinate neodymium-iron-boron magnet as claimed in claim 1 is characterized in that: the demagnetization barrel shape is a cylinder, and outer diameter D is 80～120mm, and inner diameter d is 70～110mm, and length H is 300～700mm.
6, the demagnetizer of Agglutinate neodymium-iron-boron magnet as claimed in claim 5 is characterized in that: demagnetization tube outer diameter D is 100mm, and inner diameter d is 90mm.
7, the demagnetizer of Agglutinate neodymium-iron-boron magnet as claimed in claim 1 is characterized in that: the material of preparation demagnetization tube comprises aluminium oxide, chromium oxide, magnesium oxide or calcium oxide refractory ceramic material.
8, the demagnetizer of Agglutinate neodymium-iron-boron magnet as claimed in claim 1, it is characterized in that: metal guide rail is provided with groove.
9, the demagnetizer of Agglutinate neodymium-iron-boron magnet as claimed in claim 1 is characterized in that: the frequency of load coil is 200～300kHz, power 8～20kw.
10, the demagnetizer of Agglutinate neodymium-iron-boron magnet as claimed in claim 1 is characterized in that: the internal diameter of load coil is than the big 10～30mm of external diameter of demagnetization tube.
11, the demagnetizer of Agglutinate neodymium-iron-boron magnet as claimed in claim 1 is characterized in that: the power frequency internal coil diameter is than the big 10～30mm of external diameter of radio-frequency induction coil.
12, the demagnetizer of Agglutinate neodymium-iron-boron magnet as claimed in claim 1 is characterized in that: the power frequency coil adopts the enamelled wire of diameter 1.5～2.0mm, and around 300～500 circles, AC current control is at 3～7 amperes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200598161U CN201259811Y (en) | 2008-06-17 | 2008-06-17 | Demagnetizer for adhering Nd-Fe-B magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200598161U CN201259811Y (en) | 2008-06-17 | 2008-06-17 | Demagnetizer for adhering Nd-Fe-B magnet |
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| Publication Number | Publication Date |
|---|---|
| CN201259811Y true CN201259811Y (en) | 2009-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008200598161U Expired - Fee Related CN201259811Y (en) | 2008-06-17 | 2008-06-17 | Demagnetizer for adhering Nd-Fe-B magnet |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017079183A1 (en) * | 2015-11-06 | 2017-05-11 | Ut-Battelle, Llc | System and method for the recycling of rare earth magnets |
| CN106876088A (en) * | 2017-03-23 | 2017-06-20 | 无锡市卡德姆机械科技有限公司 | Vibration degausser with air-heater |
| CN107424721A (en) * | 2017-09-22 | 2017-12-01 | 上海杰灵磁性器材有限公司 | A kind of pipeline demagnetizer and its application based on permanent-magnet structure |
| CN112737241A (en) * | 2020-12-18 | 2021-04-30 | 浙江英洛华磁业有限公司 | Method of manufacturing a rotor assembly |
| US11230752B2 (en) | 2019-02-25 | 2022-01-25 | Ut-Battelle, Llc | Hard disk drive dismantlement for critical material recovery |
| US11611266B2 (en) | 2018-12-18 | 2023-03-21 | Ut-Battelle, Llc | Automated recovery of rare earth permanent magnets from electric machines |
-
2008
- 2008-06-17 CN CNU2008200598161U patent/CN201259811Y/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017079183A1 (en) * | 2015-11-06 | 2017-05-11 | Ut-Battelle, Llc | System and method for the recycling of rare earth magnets |
| US20170128954A1 (en) * | 2015-11-06 | 2017-05-11 | Ut-Battelle, Llc | System and method for the recycling of rare earth magnets |
| US10643776B2 (en) * | 2015-11-06 | 2020-05-05 | Ut-Battelle, Llc | System and method for the recycling of rare earth magnets |
| US11250980B2 (en) * | 2015-11-06 | 2022-02-15 | Ut-Battelle, Llc | System and method for the recycling of rare earth magnets |
| CN106876088A (en) * | 2017-03-23 | 2017-06-20 | 无锡市卡德姆机械科技有限公司 | Vibration degausser with air-heater |
| CN106876088B (en) * | 2017-03-23 | 2018-07-24 | 无锡市卡德姆机械科技有限公司 | Vibration degausser with air-heater |
| CN107424721A (en) * | 2017-09-22 | 2017-12-01 | 上海杰灵磁性器材有限公司 | A kind of pipeline demagnetizer and its application based on permanent-magnet structure |
| CN107424721B (en) * | 2017-09-22 | 2023-08-29 | 上海杰灵磁性器材有限公司 | Pipeline demagnetizing device based on permanent magnet structure and application thereof |
| US11611266B2 (en) | 2018-12-18 | 2023-03-21 | Ut-Battelle, Llc | Automated recovery of rare earth permanent magnets from electric machines |
| US11230752B2 (en) | 2019-02-25 | 2022-01-25 | Ut-Battelle, Llc | Hard disk drive dismantlement for critical material recovery |
| CN112737241A (en) * | 2020-12-18 | 2021-04-30 | 浙江英洛华磁业有限公司 | Method of manufacturing a rotor assembly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090617 Termination date: 20100617 |