CN106698175B - Magnetic unit and ring type electric permanent magnetic chuck thereof - Google Patents
Magnetic unit and ring type electric permanent magnetic chuck thereof Download PDFInfo
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- CN106698175B CN106698175B CN201510790719.4A CN201510790719A CN106698175B CN 106698175 B CN106698175 B CN 106698175B CN 201510790719 A CN201510790719 A CN 201510790719A CN 106698175 B CN106698175 B CN 106698175B
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- 230000002441 reversible effect Effects 0.000 claims abstract description 45
- 230000002427 irreversible effect Effects 0.000 claims abstract description 43
- 230000005284 excitation Effects 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 12
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 11
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 7
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 claims description 7
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 claims description 6
- 229910000859 α-Fe Inorganic materials 0.000 claims description 6
- 230000004907 flux Effects 0.000 claims description 5
- -1 manganese Aluminum carbon Chemical compound 0.000 claims description 4
- WBWJXRJARNTNBL-UHFFFAOYSA-N [Fe].[Cr].[Co] Chemical compound [Fe].[Cr].[Co] WBWJXRJARNTNBL-UHFFFAOYSA-N 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 230000006698 induction Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910000828 alnico Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 229910000926 A-3 tool steel Inorganic materials 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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Abstract
本发明所提供的环式电永磁吸盘，包括外壳，及设于外壳内的至少一个磁性单元，所述外壳包裹磁性单元，并用螺丝进行固定，其中所述磁性单元包括可逆磁环、不可逆磁环、导磁板及励磁线圈，所述不可逆磁环镶嵌在可逆磁环内且两者的高度相等；所述导磁板固定地设置在所述可逆磁环与不可逆磁环相贴合的两个端面上；所述励磁线圈缠绕在不可逆磁环的外部，并相对于不可逆磁环包裹设置。本发明可进行双面作业，且工作时对工件的吸持作业不仅受力平衡，而且吸力大。
The ring-type electro-permanent magnet chuck provided by the present invention includes a casing and at least one magnetic unit arranged in the casing. The casing wraps the magnetic unit and is fixed with screws, wherein the magnetic unit includes a reversible magnetic ring, an irreversible magnetic A ring, a magnetic conductive plate and an excitation coil, the irreversible magnetic ring is embedded in the reversible magnetic ring and the heights of the two are equal; the magnetic conductive plate is fixedly arranged on the two sides where the reversible magnetic ring and the irreversible magnetic ring fit each end face; the excitation coil is wound on the outside of the irreversible magnetic ring, and is wrapped around the irreversible magnetic ring. The invention can perform double-sided operation, and the suction operation of the workpiece during operation not only has a balanced force, but also has a large suction force.
Description
Technical Field
The invention belongs to the technical field of ring-type electric permanent magnetic chucks, and particularly relates to a magnetic unit and a ring-type electric permanent magnetic chuck thereof.
Background
The electric control permanent magnetic chuck is a novel hoisting device which combines electromagnetic property and permanent magnetic property. The magnetic pole structure of the electric control permanent magnetic chuck is divided into an inner part and an outer part, the outer part is a magnetic yoke, the inner part is composed of an upper layer of high coercivity neodymium iron boron and a magnetic pole block, wherein the neodymium iron boron permanent magnet is distributed between the side surface of the magnetic pole block and the magnetic yoke; the lower layer consists of medium coercive-force alnico magnetic steel capable of magnetizing the lower layer in forward and reverse directions and an excitation coil. When the electric control permanent magnet sucker works, the reversible magnetic steel is positively and negatively magnetized by the exciting coil, and the distribution of magnetic induction lines on the surface of the ring type electric permanent magnet sucker is changed, so that the sucking and releasing functions of the ring type electric permanent magnet sucker are realized.
At present, the existing electric control permanent magnetic chuck has the Chinese invention patent with the patent application number of '201410263876.5' and the name of 'a ring type electric permanent magnetic chuck' and the Chinese utility model patent with the patent application number of '201320761602. X' and the name of 'a ring type electric permanent magnetic chuck with full magnetic pole magnetic force detection and temperature detection', and the magnetic pole structures of the ring type electric permanent magnetic chuck are similar to the structure. Although the structure can effectively realize the function of the ring-type electric permanent magnetic chuck, the thickness and the size of the ring-type electric permanent magnetic chuck are limited because the magnetic poles forming the ring-type electric permanent magnetic chuck are composed of an upper layer and a lower layer.
In view of the above technical problems, people have conducted continuous research and proposed chinese invention patent with patent application number "201410261653.5" entitled "a dual-magnet electric control permanent magnetic chuck with parallel poles". This patent specifically discloses an automatically controlled permanent magnet chuck of two magnets of utmost point direction parallel, and it has reduced the whole thickness of ring type electric permanent magnet chuck through the parallel arrangement of reversible magnet steel and irreversible magnet steel, nevertheless because the coil is not whole closely around reversible magnet steel, the excitation coil was kept away from to reversible magnet steel part just is difficult for being magnetized, leads to irreversible magnet steel to magnetize unevenly. Because the reversible magnetic steel is unevenly magnetized, the uniformity of the suction force of the ring type electric permanent magnetic chuck on the workpiece is affected, and the workpiece is easy to fall off. In order to avoid the falling of the workpiece, the full magnetization of the reversible magnetic steel can be ensured only by increasing the number of turns of the coil and increasing the current. Accordingly, the magnitude of the current and the number of turns of the coil directly affect the service life of the coil and the volume of the ring type electric permanent magnetic chuck. In addition, the existing ring-type electric permanent magnetic chuck only has one holding surface, and for occasions needing two holding surfaces, only a method of increasing the ring-type electric permanent magnetic chuck or adopting mechanical structure conversion can be adopted, so that the cost or the fault possibility of equipment is increased.
Disclosure of Invention
The object of the present invention is to provide a magnetic unit and a ring-type electric permanent magnetic chuck thereof for solving the above technical problems.
The magnetic unit comprises a reversible magnetic ring, an irreversible magnetic ring, a magnetic conduction plate and an excitation coil, wherein the irreversible magnetic ring is embedded in the reversible magnetic ring and the irreversible magnetic ring are equal in height; the magnetic conducting plates are fixedly arranged on two end faces, attached to the reversible magnetic ring and the irreversible magnetic ring, of the reversible magnetic ring; the excitation coil is wound outside the irreversible magnetic ring and is wrapped and arranged relative to the irreversible magnetic ring.
As a preferred scheme of the present invention, the cross sections of the reversible magnetic ring and the irreversible magnetic ring are uniformly arranged in a circular or square structure with a central hole, and the magnetic induction lines are distributed along the height direction.
As a preferable scheme of the invention, the material of the reversible magnetic ring comprises manganese-aluminum-carbon, aluminum-nickel-cobalt or iron-chromium-cobalt, and the coercive force of the reversible magnetic ring is 30-200 kA/m.
As a preferable scheme of the invention, the material of the irreversible magnetic ring comprises permanent magnetic ferrite, samarium cobalt or neodymium iron boron, and the coercive force of the irreversible magnetic ring is 600-2000 kA/m.
The invention also provides a ring type electric permanent magnetic chuck which comprises a shell and at least one magnetic unit, wherein the shell wraps the magnetic unit and is fixed by screws.
As a preferable aspect of the present invention, the electric permanent magnetic chuck includes a plurality of magnetic units, and the plurality of magnetic units are arranged in a lateral direction with respect to the housing.
As a preferable aspect of the present invention, the electric permanent magnetic chuck includes a plurality of magnetic units, and the plurality of magnetic units are longitudinally stacked with respect to the housing.
Due to the application of the technical scheme, compared with the prior art, the ring type electric permanent magnetic chuck provided by the invention has the following advantages: 1. through reasonable structural arrangement of the magnetic units, the upper end surface and the lower end surface of the ring-type electric permanent magnetic chuck can be simultaneously sucked or unloaded, so that the defect that only one end surface of the existing ring-type electric permanent magnetic chuck is used as a working surface is overcome; 2. the whole ring-type electric permanent magnetic chuck structure is centrosymmetric, so that the magnetic lines of force of the magnetic units are uniformly distributed, and the stress balance of the ring-type electric permanent magnetic chuck on a workpiece is further promoted; 3. the annular reversible magnetic ring and the annular irreversible magnetic ring are structurally arranged, so that a working surface of the annular electric permanent magnetic chuck is provided with a central hole, and the central hole not only plays a role in isolating magnetic lines of force on two sides of the magnetic ring so as to enhance the performance of the annular electric permanent magnetic chuck, but also can be used as a material conveying space; 4. the magnetic units are applied to the ring-type electric permanent magnetic chuck, the suction force of the ring-type electric permanent magnetic chuck in unit area can be improved in a mode of longitudinally overlapping the magnetic units, and the total suction force of the ring-type electric permanent magnetic chuck can be increased in a mode of transversely arranging the magnetic units; 5. because the whole structure of the magnetic unit is simple and the processing is convenient, the volume of the magnetic unit can be easily reduced or enlarged, and then the ring type electric permanent magnetic chuck applying the magnetic unit can be used for manufacturing a micro electromechanical switching device or a large ring type electric permanent magnetic chuck.
Drawings
FIG. 1 is a schematic view of a magnetic cell according to the present invention.
Fig. 2 is a schematic structural view of the magnetic unit of the present invention configured in a circular structure.
FIG. 3 is a schematic diagram of the magnetic unit of the present invention configured in a square configuration.
FIG. 4 is a schematic view of the magnetic flux distribution of the ring-type electro-permanent magnetic chuck according to the present invention, wherein the ring-type electro-permanent magnetic chuck is in an unloaded state.
Fig. 5 is a schematic view of the magnetic flux distribution of the ring-type electro-permanent magnetic chuck according to the present invention, wherein the ring-type electro-permanent magnetic chuck is in a holding state.
FIG. 6 is a schematic diagram of the magnetic unit of the present invention assembled to the ring-type electro-permanent magnetic chuck in a vertically stacked manner.
FIG. 7 is a schematic view of the magnetic units of the present invention assembled in a lateral arrangement to a ring-type electro-permanent magnetic chuck.
FIG. 8 is a top view of the ring-type electro-permanent magnetic chuck in accordance with the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Referring to fig. 6-8, the ring-type electric permanent magnetic chuck 100 of the present invention includes a housing 10 and a magnetic unit 20 disposed in the housing 10, wherein the housing 10 includes the magnetic unit 20 and is fixed by a screw 30. It can be understood that the external structure of the outer shell 10 of the electric permanent magnetic chuck 100 of the present embodiment is specifically matched with the structure of the magnetic unit, and the outer end surface of the outer shell 10 and the magnetic unit 20 are fixed by a plurality of plastic screws.
Referring to fig. 1-3, the magnetic unit 20 specifically includes a reversible magnetic ring 21, an irreversible magnetic ring 22, a magnetic conductive plate 23, and an excitation coil 24. The heights of the reversible magnetic ring 21 and the irreversible magnetic ring 22 are equal, the inner diameter of the reversible magnetic ring 21 is equal to the outer diameter of the irreversible magnetic ring 22, and the irreversible magnetic ring 22 is specifically embedded in the reversible magnetic ring 21, preferably, the thickness of the irreversible magnetic ring 22 is slightly larger than that of the reversible magnetic ring 21. The magnetic conductive plates 23 are specifically fixed on the upper and lower surfaces of the reversible magnetic ring 21 and the irreversible magnetic ring 22, and are attached to the reversible magnetic ring 21 and the irreversible magnetic ring 22; the excitation coil 24 is specifically wound around the exterior of the reversible magnetic ring 21 and is wrapped around the irreversible magnetic ring 22.
As can be seen from the above combination of the specific components of the magnetic unit 20 and the arrangement of the positional relationship between the components, the magnetic unit 20 of the present invention has a vertically symmetric structure, so that the upper and lower end surfaces of the magnetic unit 20 can be used as the operation surfaces, and further the magnetic unit 20 is specifically assembled into the electric permanent magnetic chuck 100 for use, so that the upper and lower end surfaces of the electric permanent magnetic chuck 100 can be simultaneously sucked or unloaded, thereby making up the defect that the existing ring-type electric permanent magnetic chuck has only one end surface as the working surface. Meanwhile, the magnetic unit 20 has a simple overall structure and is convenient to process, so that the volume of the magnetic unit 20 can be easily reduced or enlarged, and the electric permanent magnetic chuck 100 using the magnetic unit 20 can be used for manufacturing a micro electromechanical switching device or a large ring-type electric permanent magnetic chuck.
The cross sections of the reversible magnetic ring 21 and the irreversible magnetic ring 22 are uniformly arranged to be circular or square structures provided with central holes, and the magnetic induction lines are distributed along the height direction, so that the magnetic unit 20 is integrally of a centrosymmetric structure, the magnetic force lines of the magnetic unit 20 are uniformly distributed, and the stress balance of the electric permanent magnetic chuck 100 when acting on a workpiece is further promoted; the magnetic conducting plate 23 is made of a metal soft magnetic material to play a role of a magnetic conducting yoke, and specifically, materials which can be adopted include silicon steel, No. 45 steel, A3 steel and the like, wherein the magnetic conductivity and the saturation magnetic induction intensity of the low-carbon steel are high, so that the surface magnetic field and the suction force of the ring-type electric permanent magnetic chuck are increased. The magnetic conductive plate 23 is applied to the electric permanent magnetic chuck 100, and is specifically connected and fixed with the casing 10 through a screw 30.
The material of the irreversible magnetic ring 22 includes permanent magnetic ferrite, samarium cobalt or neodymium iron boron, and the coercivity of the irreversible magnetic ring is 600 to 2000kA/m, that is, the material of the irreversible magnetic ring 22 of the present invention may specifically be at least one of permanent magnetic ferrite, samarium cobalt or neodymium iron boron. The permanent magnetic ferrite material is cheap, but has low performance. In order to improve the suction force, the irreversible magnetic ring 22 is preferably made of neodymium iron boron magnet. The reason is that the neodymium iron boron magnet has the most excellent magnetic performance at normal temperature, but the magnetic performance of the neodymium iron boron magnet is greatly influenced by temperature, the remanence and the coercive force are gradually reduced along with the temperature increase, and the temperature coefficient of the coercive force is about five per thousandth of degree. Therefore, in order to ensure that the magnet has certain magnetic performance at a higher working temperature (such as 100 ℃), the normal-temperature magnetic performance, particularly the coercive force, needs to be high enough, so that the coercive force of the magnet is preferably not lower than 600kA/m in comprehensive consideration. Compared with the working temperature of the neodymium iron boron magnet which is about 200 ℃ at most, the samarium cobalt magnet has extremely low coercive force temperature coefficient and the highest working temperature of nearly 500 ℃, so that the samarium cobalt is most suitable for the ring type electric permanent magnetic chuck used under the high temperature condition (more than 200 ℃).
Because of the current limitation of the excitation coil 24, the reversible magnetic ring 21 is usually made of permanent magnetic material with low coercive force so as to easily commutate the magnetic field, and the material of the reversible magnetic ring 21 of the invention specifically comprises permanent magnetic ferrite, samarium cobalt or neodymium iron boron, and the coercive force of the material is 30-200 kA/m. Alnico magnets may also be used in order to obtain the highest possible remanence. The permanent magnet can be divided into five types with high remanence and eight types with high coercivity, wherein the temperature coefficient of the coercivity of the eight types of magnets can reach two ten-thousandth per degree, the long-time working temperature can be 500 ℃, but the coercivity is too high, so that the permanent magnet is not suitable for application of the ring-type electric permanent magnet sucker. Therefore, the five types of magnetic steel are more suitable to be selected, and the requirements of moderate coercive force, high use temperature and good stability are met.
It can be understood that, in order to make the electric permanent magnetic chuck 100 work normally, a current controller (not shown) is also needed, and the electric permanent magnetic chuck 100 can hold and unload the workpiece during the work by charging and discharging the exciting coil 24. Preferably, the controller outputs direct current by using silicon controlled rectifier rectification, and has the functions of current direction switching, overcurrent protection, excitation coil temperature detection, magnetic field intensity measurement and the like.
Referring to fig. 4 and 5, when the magnetic poles of the reversible magnetic ring 21 and the irreversible magnetic ring 22 are oriented in opposite directions, the magnetic lines of force form a closed loop in the magnetic unit 20, and no magnetic flux passes through the workpiece, and the attraction force of the magnetic unit 20 to the workpiece is small or close to zero; when the reversible magnetic ring 21 is reversely magnetized, the magnetic poles of the reversible magnetic ring 21 and the irreversible magnetic ring 22 have the same orientation, the magnetic field of the reversible magnetic ring 21 and the magnetic field of the irreversible magnetic ring 22 are mutually overlapped, a large amount of magnetic flux passes through a workpiece, and the workpiece is attracted.
The electric permanent magnetic chuck 100 of the present invention specifically includes at least one magnetic unit 20 according to the use requirement, and when the electric permanent magnetic chuck 100 of the present invention includes a plurality of magnetic units 20, the magnetic units 20 may be disposed in the housing 10 in a longitudinal overlapping manner or a transverse arrangement manner. Accordingly, when the plurality of magnetic units 20 in the housing 10 are longitudinally overlapped, the suction force per unit area of the workpiece when the electric permanent magnetic chuck 100 works can be increased to ensure the suction effect of the electric permanent magnetic chuck 100 on the workpiece; when the plurality of magnetic units 20 in the housing 10 are arranged in the transverse direction, the number of suction points per unit area of the workpiece when the electric permanent magnetic chuck 100 works can be increased, so as to ensure the suction effect of the electric permanent magnetic chuck 100 on the workpiece.
As can be seen from the above, the irreversible magnetic ring 22 and the reversible magnetic ring 21 which constitute the magnetic unit 20 are both configured to have a structure with a central hole, such that when the magnet units 20 are assembled in the housing 10 in a longitudinally superposed manner, the electric permanent magnetic chuck 100 is integrally formed with a communicating central hole, when assembled in a lateral arrangement within housing 10, will result in the electro-permanent magnetic chuck 100 integrally forming a plurality of sub-central apertures, it being understood that, the nature of the central hole formed by the electric permanent magnetic chuck 100 integrally depends on the shapes of the irreversible magnetic ring 22 and the reversible magnetic ring 21, and the central hole is applied on the electric permanent magnetic chuck 100, the function of isolating magnetic lines of force on two sides can be performed on the irreversible magnetic ring 22 and the reversible magnetic ring 21, so as to further enhance the performance of the electric permanent magnetic chuck 100, and meanwhile, the function can also be used as a processing space for other special parts in the electric permanent magnetic chuck 100.
As a preferred embodiment of the present invention, the electric permanent magnetic chuck 100 of the present invention is attached with thermistors 241 on the surface of the exciting coil 24 of each magnet unit 20, respectively, for monitoring the temperature of the exciting coil 24 to prevent the exciting coil 24 from being damaged due to high temperature.
In summary, the ring-type electric permanent magnetic chuck provided by the present invention has the following advantages compared with the prior art: 1. through reasonable structural arrangement of the magnetic units, the upper end surface and the lower end surface of the ring-type electric permanent magnetic chuck can be simultaneously sucked or unloaded, so that the defect that only one end surface of the existing ring-type electric permanent magnetic chuck is used as a working surface is overcome; 2. the whole ring-type electric permanent magnetic chuck structure is centrosymmetric, so that the magnetic lines of force of the magnetic units are uniformly distributed, and the stress balance of the ring-type electric permanent magnetic chuck on a workpiece is further promoted; 3. the annular reversible magnetic ring and the annular irreversible magnetic ring are structurally arranged, so that a working surface of the annular electric permanent magnetic chuck is provided with a central hole, and the central hole not only plays a role in isolating magnetic lines of force on two sides of the magnetic ring so as to enhance the performance of the annular electric permanent magnetic chuck, but also can be used as a material conveying space; 4. the magnetic units are applied to the ring-type electric permanent magnetic chuck, the suction force of the ring-type electric permanent magnetic chuck in unit area can be improved in a mode of longitudinally overlapping the magnetic units, or a mode of transversely arranging the magnetic units can be adopted, or the magnetic units are longitudinally overlapped firstly, and then the overlapped parts are transversely arranged, so that the total suction force of the ring-type electric permanent magnetic chuck is increased; 5. because the whole structure of the magnetic unit is simple and the processing is convenient, the volume of the magnetic unit can be easily reduced or enlarged, and then the ring type electric permanent magnetic chuck applying the magnetic unit can be used for manufacturing a micro electromechanical switching device or a large ring type electric permanent magnetic chuck.
The invention is not to be considered as limited to the details of the foregoing description, but is to be construed in all aspects as including all variations, modifications, equivalents and alternatives falling within the spirit and scope of the invention.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510790719.4A CN106698175B (en) | 2015-11-17 | 2015-11-17 | Magnetic unit and ring type electric permanent magnetic chuck thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510790719.4A CN106698175B (en) | 2015-11-17 | 2015-11-17 | Magnetic unit and ring type electric permanent magnetic chuck thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106698175A CN106698175A (en) | 2017-05-24 |
| CN106698175B true CN106698175B (en) | 2022-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510790719.4A Active CN106698175B (en) | 2015-11-17 | 2015-11-17 | Magnetic unit and ring type electric permanent magnetic chuck thereof |
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| Country | Link |
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| CN (1) | CN106698175B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI688828B (en) * | 2018-08-24 | 2020-03-21 | 創王光電股份有限公司 | Photoresist processing system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2230566B3 (en) * | 1973-05-25 | 1977-01-07 | Deutsche Edelstahlwerke Ag | |
| JP2000185890A (en) * | 1998-12-21 | 2000-07-04 | Daihatsu Motor Co Ltd | Attracting device |
| CN201647792U (en) * | 2010-04-13 | 2010-11-24 | 昆山苇一机械有限公司 | Electro-permanent magnet lifting jack |
| ITMI20122047A1 (en) * | 2012-11-30 | 2014-05-31 | Sgm Gantry Spa | LIFT WITH ELECTROPERMANENT MAGNETS |
| CN203699637U (en) * | 2013-12-16 | 2014-07-09 | 天津神封科技发展有限公司 | Vertical switch type permanent magnetic chuck |
| CN104015082B (en) * | 2014-06-13 | 2017-05-10 | 株洲悍威磁电科技有限公司 | Electric permanent magnetic chuck |
| CN204038842U (en) * | 2014-09-10 | 2014-12-24 | 浙江东亿磁业有限公司 | A kind of explosion-proof multipath magnetic circuit sucker |
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