CN109681041A - A kind of electromagnetic clutch - Google Patents
A kind of electromagnetic clutch Download PDFInfo
- Publication number
- CN109681041A CN109681041A CN201910034764.5A CN201910034764A CN109681041A CN 109681041 A CN109681041 A CN 109681041A CN 201910034764 A CN201910034764 A CN 201910034764A CN 109681041 A CN109681041 A CN 109681041A
- Authority
- CN
- China
- Prior art keywords
- axle sleeve
- hollow channel
- fixed frame
- coil
- electromagnetic clutch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
- E05B47/06—Controlling mechanically-operated bolts by electro-magnetically-operated detents
- E05B47/0676—Controlling mechanically-operated bolts by electro-magnetically-operated detents by disconnecting the handle
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
- E05B47/06—Controlling mechanically-operated bolts by electro-magnetically-operated detents
- E05B47/0603—Controlling mechanically-operated bolts by electro-magnetically-operated detents the detent moving rectilinearly
Abstract
The invention discloses a kind of electromagnetic clutch, including shell, cavity is provided in the shell, the cavity inner wall is fixedly connected with electromagnetism fixed frame, opening is provided at the top of the electromagnetism fixed frame, coil is provided in the electromagnetism fixed frame, the opening is fixedly installed electromagnet core sealing plate, magnet is provided between the electromagnet core sealing plate and the coil, the middle part of the coil is provided with connected pathways along the direction of its central axes, axle sleeve is provided in the connected pathways, the top of the axle sleeve is successively pierced by the magnet, electromagnet core sealing plate, the top surface of shell, reset spring is socketed on the outside of the axle sleeve, the top of the axle sleeve is provided with the shaft shoulder, the top of the axle sleeve is connected with clutch supporting plate, the present invention is non-contact transmission, reduce the phase mutual friction between structure motion, and it reduces using power consumption, It improves service life, performance is more stable.
Description
Technical field
The present invention relates to a kind of lockset more particularly to a kind of electromagnetic clutch.
Background technique
With the development of science and technology lockset industry has also obtained quick development, electronic lock, the application range of smart lock are more next
Wider, more more and more universal use in daily life, using control modes of these locks on the market now is usually that motor rotates
Clutch is realized in the compression of rear pin shaft detent push the spring, be will appear motor stator at this time and is repeatedly rubbed with the contact wear and spring for visiting brush
It wipes, the damage of compression, the core component of lock goes wrong, and lock cannot use and be difficult to repair, and lockset needs long-term maintain
Power supply state, and lockset is powered usually using 5# battery, electric quantity consumption is very fast, and usage experience is poor.
Summary of the invention
The technical problem to be solved by the present invention is needing a kind of clutch applied to lockset, rubbing when capable of reducing using
It wipes, and reduces power consumption when use, improve service life.
The solution that the present invention solves its technical problem is: a kind of electromagnetic clutch, including shell, sets in the shell
It is equipped with cavity, the cavity inner wall is fixedly connected with electromagnetism fixed frame, and opening is provided at the top of the electromagnetism fixed frame, described
Coil is provided in electromagnetism fixed frame, the opening is fixedly installed electromagnet core sealing plate, the electromagnet core sealing plate and the line
It is provided with magnet between circle, the middle part of the coil is provided with connected pathways along the direction of its central axes, in the connected pathways
It is provided with axle sleeve, the top of the axle sleeve is successively pierced by the top surface of the magnet, electromagnet core sealing plate, shell, and the axle sleeve is in institute
It states and is moved back and forth in shell along the central axes direction of the coil, reset spring, the axle sleeve are socketed on the outside of the axle sleeve
Top be provided with the shaft shoulder, the top of the reset spring is connected to the bottom side of the shaft shoulder, and the bottom end of the reset spring is supported
It is connected to the top side of the electromagnet core sealing plate, the top of the axle sleeve is connected with clutch supporting plate.
The present invention provides a kind of electromagnetic clutch, including shell, and the cavity of contained structure component is provided in shell, assembly
When, first coil can be fixed in electromagnetism fixed frame, then magnet is fixed on to the top of coil, it then will using electromagnet core sealing plate
The opening of electromagnetism fixed frame connects and rivets fixation, makes magnet compacting at the top of coil, the electricity that will finally assemble again
Magnetically fixed frame is fixed in the cavity, and reset spring is nested into the outside of axle sleeve from the bottom up from the bottom end of axle sleeve, will reset bullet
Along the connected pathways that the central axes of coil are inserted into coil, axle sleeve can move back and forth spring in connected pathways, when coil is passed through
When forward current, the magnetic field that coil generates in the middle part of magnetic fields, with magnet is in the same direction, so that axle sleeve is moved to inside cavity, resets
Spring is compressed, and axle sleeve drives clutch supporting plate to move downward, and when coil leads to reverse current, coil generates magnetic fields, with
Reverse magnetic field in the middle part of magnet, compressed reset spring restore to the original state, and elastic force moves axle sleeve to far from inside cavity, axis
Set drives clutch supporting plate to move upwards, and such clutch mode is sequentially connected with clutch on clutch supporting plate as in practical applications
Pin is in and out of clutch card slot so that on-of pin is different according to the direction of coil current, when realizing pushing lock body handle, if can
Lock tongue activity is driven, to realize the opening operation of lockset, it can be seen that, the structure of this electromagnetic clutch, which can effectively reduce, finishes
The friction that structure generates when moving, reduces the failure rate of clutch in lockset, improves service life.
As a further improvement of the above technical scheme, the bottom surface top side of the electromagnetism fixed frame is right against the axle sleeve
Position setting helps suction column, described that the top surface for inhaling column is helped to be provided with the locating slot to match with the axle sleeve lower shape.
As a further improvement of the above technical scheme, the bottom end of the axle sleeve is coniform.
As a further improvement of the above technical scheme, the axle sleeve is from top to bottom disposed with along wherein axis direction
First hollow channel and the second hollow channel, first hollow channel and the second hollow channel are interconnected, in described first
The internal diameter in empty channel is greater than the internal diameter of second hollow channel, and the top of first hollow channel is fixedly connected with shaft-cup,
Central spindle is provided in first hollow channel, the top exterior walls of the central spindle are provided with limit section, the outer diameter of the limit section
Greater than the internal diameter of second hollow channel, the bottom end of the central spindle sequentially passes through second hollow channel, helps and inhale column, electromagnetism
The bottom surface of fixed frame, the top of the central spindle are socketed with buffer spring, and the top of the buffer spring is connected to the shaft-cup
Bottom surface, the bottom end of the buffer spring are connected to the top surface of the limit section.
As a further improvement of the above technical scheme, the two sidewalls of the cavity are provided with slideway, the slideway with
The central axes of the axle sleeve are parallel to each other, and the clutch supporting plate includes the slide bar being respectively arranged in two slideways, and two
It is connected with connecting rod between the bottom end of the slide bar, the connecting rod is set to the lower section of the central spindle, two slide bars
Gag lever post is connected between top, the top of the axle sleeve is connected to the bottom side of the gag lever post, and the gag lever post is arc-shaped,
The circular arc opening of the gag lever post faces away from the axle sleeve side.
As a further improvement of the above technical scheme, it is provided in the gag lever post along the arc length direction of the gag lever post
Curved channel.
Beneficial effect using above-mentioned further scheme is: cooperate between structure it is tight, it is stable, it can be achieved that no power feelings
Clutch is maintained under condition opens or closes state, and power consumption is lower.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described.Obviously, described attached drawing is a part of the embodiments of the present invention, rather than is all implemented
Example, those skilled in the art without creative efforts, can also be obtained according to these attached drawings other designs
Scheme and attached drawing.
Fig. 1 is whole interior structural schematic diagram when being passed through forward current of the invention；
Fig. 2 is whole interior structural schematic diagram when being passed through reverse current of the invention.
In figure: 1- shell, 2- electromagnetism fixed frame, 3- coil, 4- electromagnet core sealing plate, 5- magnet, 6- axle sleeve, 7- reset bullet
Spring, the 8- shaft shoulder, 9-, which are helped, inhales column, 10- locating slot, 11- slide bar, 12- connecting rod, 13- gag lever post, 14- central spindle, 15- buffer spring.
Specific embodiment
It is carried out below with reference to technical effect of the embodiment and attached drawing to design of the invention, specific structure and generation clear
Chu is fully described by, to be completely understood by the purpose of the present invention, feature and effect.Obviously, described embodiment is this hair
Bright a part of the embodiment, rather than whole embodiments, based on the embodiment of the present invention, those skilled in the art are not being paid
Other embodiments obtained, belong to the scope of protection of the invention under the premise of creative work.In addition, be previously mentioned in text
All connection relationships not singly refer to that component directly connects, and referring to can be according to specific implementation situation, by adding or reducing connection
Auxiliary, Lai Zucheng more preferably connection structure.Each technical characteristic in the invention, under the premise of not conflicting conflict
It can be with combination of interactions.
Referring to Fig.1, a kind of electromagnetic clutch, including shell 1, cavity is provided in the shell 1, and the cavity inner wall is solid
Surely it is connected with electromagnetism fixed frame 2, the top of the electromagnetism fixed frame 2 is provided with opening, and setting is wired in the electromagnetism fixed frame 2
Circle 3, the opening is fixedly installed electromagnet core sealing plate 4, is provided with magnet between the electromagnet core sealing plate 4 and the coil 3
5, the middle part of the coil 3 is provided with connected pathways along the direction of its central axes, and axle sleeve 6, institute are provided in the connected pathways
The top for stating axle sleeve 6 is successively pierced by the top surface of the magnet 5, electromagnet core sealing plate 4, shell 1, and the axle sleeve 6 is in the shell 1
Central axes direction along the coil 3 moves back and forth, and the outside of the axle sleeve 6 is socketed with reset spring 7, the top of the axle sleeve 6
End is provided with the shaft shoulder 8, and the top of the reset spring 7 is connected to the bottom side of the shaft shoulder 8, and the bottom end of the reset spring 7 is supported
It is connected to the top side of the electromagnet core sealing plate 4, the top of the axle sleeve 6 is connected with clutch supporting plate.
It can be seen from the above, the present invention provides a kind of electromagnetic clutch, including shell 1, contained structure structure is provided in shell 1
Coil 3 when assembly, can be first fixed in electromagnetism fixed frame 2, then magnet 5 is fixed on to the top of coil 3, so by the cavity of part
The opening of electromagnetism fixed frame 2 is connected and riveted fixation using electromagnet core sealing plate 4 afterwards, makes the compacting of magnet 5 on the top of coil 3
Portion, it is finally again that the electromagnetism fixed frame 2 assembled is fixed in the cavity, reset spring 7 is covered from the bottom up from the bottom end of axle sleeve 6
Enter to the outside of axle sleeve 6, by reset spring 7 along the connected pathways that the central axes of coil 3 are inserted into coil 3, axle sleeve 6 can passed through
Break-through moves back and forth in road, and the electromagnetic force that coil 3 generates is greater than the magnetic force that magnet 5 generates, and the magnetic force that magnet 5 generates, which is greater than, to be resetted
The elastic force that spring 7 generates, and the resultant force of the elastic force of the magnetic force of magnet 5 and reset spring 7 is less than the electromagnetic force that coil 5 generates,
When coil 3 is passed through forward current, coil 3 generates magnetic fields, in the same direction with the magnetic field at the middle part of magnet 5, so that axle sleeve 6 is to cavity
Internal motion, reset spring 7 are compressed, and axle sleeve 6 drives clutch supporting plate to move downward, when coil 3 leads to reverse current, coil
3 generate magnetic fields, and the reverse magnetic field with the middle part of magnet 5, compressed reset spring 7 restores to the original state, elastic force make axle sleeve 6 to
It is moved far from inside cavity, axle sleeve 6 drives clutch supporting plate to move upwards, and such clutch mode is as in practical applications, in clutch
It is sequentially connected with on-of pin on supporting plate, so that on-of pin is different according to 3 sense of current of coil, is in and out of clutch card slot, realizes
When pushing lock body handle, if lock tongue can be driven movable, to realize the opening operation of lockset, it can be seen that, this electromagnetic clutch
The structure of device can effectively reduce the friction generated when structure motion, reduce the failure rate of clutch in lockset, improve and use
Service life.
It is further used as preferred embodiment, the bottom surface top side of the electromagnetism fixed frame 2 is right against the position of the axle sleeve 6
It installs to be equipped with to help and inhales column 9, it is described that the top surface for inhaling column 9 is helped to be provided with the locating slot 10 to match with 6 lower shape of axle sleeve, when
When axle sleeve 6 is moved to inside cavity, axle sleeve 6 is inserted into the locating slot 10 for helping and inhaling column 9, help inhale column 9 can bottom to axle sleeve 6 into
The problem of row is fixed, and bottom shakes when axle sleeve 6 being avoided to move to inside cavity, leads to the position inaccurate of clutch supporting plate,
In addition, axle sleeve 6 also plays biography magnetic action to the magnetism of magnet 5, axle sleeve 6 and being inserted into helps inhale column 9 after, axle sleeve 6, which can and help, inhales column 9
Magnetic connection is generated, the spring force that magnetic force needs to restore after reset spring 7 can be overcome to be compressed may make 6 band of axle sleeve
Dynamic clutch supporting plate is maintained at a certain particular state, and not needing to be powered maintains, and reduces Energy in use.
It is further used as preferred embodiment, the bottom end of the axle sleeve 6 is coniform, the shape and axle sleeve of locating slot 10
The shape of 6 bottom ends is adapted, coniform to play guiding role, so that axle sleeve 6 is more smooth when being inserted into locating slot 10.
It is further used as preferred embodiment, the axle sleeve 6 is from top to bottom disposed with along wherein axis direction
One hollow channel and the second hollow channel, first hollow channel and the second hollow channel are interconnected, and described first is hollow
The internal diameter in channel is greater than the internal diameter of second hollow channel, and the top of first hollow channel is fixedly connected with shaft-cup, institute
It states and is provided with central spindle 14 in the first hollow channel, the top exterior walls of the central spindle 14 are provided with limit section, described to limit the outer of section
Diameter is greater than the internal diameter of second hollow channel, and the bottom end of the central spindle 14 sequentially passes through second hollow channel, helps suction column
9, the bottom surface of electromagnetism fixed frame 2, the top of the central spindle 14 are socketed with buffer spring 15, and the top of the buffer spring 15 abuts
In the bottom surface of the shaft-cup, the bottom end of the buffer spring 15 is connected to the top surface of the limit section, and magnet 5 can be improved in central spindle 14
With the magnetic flux of coil 3, the biography magnetic effect of axle sleeve 6 is improved, so that axle sleeve 6 and help the magnetic connection inhaled between column 9 more stable,
When axle sleeve 6 is moved to inside cavity, axle sleeve 6 can be quickly toward close to the direction movement for inhaling column 9 be helped, and central spindle 14 follows under axle sleeve 6
Meeting is dropped so that the first hollow channel changes with the magnetic flux in the second hollow channel, so that moving downward for central spindle 14 is hindered
Hinder, central spindle 14 at this time can compress buffer spring 15, by the elastic force of buffer spring 15, be inserted into central spindle 14 slowly and help suction column
Inside 9, and it is pierced by the bottom surface of electromagnetism fixed frame 2, when overall operation is more steady.
Be further used as preferred embodiment, the two sidewalls of the cavity are provided with slideway, the slideway with it is described
The central axes of axle sleeve 6 are parallel to each other, and the clutch supporting plate includes the slide bar 11 being respectively arranged in two slideways, two institutes
It states and is connected with connecting rod 12 between the bottom end of slide bar 11, the connecting rod 12 is set to the lower section of the central spindle 14, described in two
Gag lever post 13 is connected between the top of slide bar 11, the top of the axle sleeve 6 is connected to the bottom side of the gag lever post 13, the limit
Position bar 13 is arc-shaped, and the circular arc opening of the gag lever post 13 faces away from 6 side of axle sleeve, since axle sleeve 6 can drive limit
Position bar 13 is up and down, and slide bar 11 can slide in the slideway of cavity, and slide bar 11 may make the movement of gag lever post 13 more steady, keeps away
Exempt from it to rotate around axle sleeve 6.
It is further used as preferred embodiment, is provided in the gag lever post 13 along the arc length direction of the gag lever post 13
Curved channel can facilitate and on-of pin is stuck in curved channel, and move in curved channel, make to the movement position of on-of pin
It limits out.
Better embodiment of the invention is illustrated above, but the invention is not limited to the implementation
Example, those skilled in the art can also make various equivalent modifications on the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent variation or replacement are all included in the scope defined by the claims of the present application.
Claims (6)
1. a kind of electromagnetic clutch, it is characterised in that: including shell, cavity, the inner wall of the cavity are provided in the shell
It is fixedly connected with electromagnetism fixed frame, opening is provided at the top of the electromagnetism fixed frame, setting is wired in the electromagnetism fixed frame
It encloses, is fixedly installed electromagnet core sealing plate in the opening, is provided with magnet between the electromagnet core sealing plate and the coil, it is described
The middle part of coil is provided with connected pathways along the direction of its central axes, and axle sleeve is provided in the connected pathways, the axle sleeve
Top is successively pierced by the top surface of the magnet, electromagnet core sealing plate, shell, and the axle sleeve is in the shell along the coil
Axis direction moves back and forth, and reset spring is socketed on the outside of the axle sleeve, the top of the axle sleeve is provided with the shaft shoulder, described multiple
The top of position spring is connected to the bottom side of the shaft shoulder, and the bottom end of the reset spring is connected to the top of the electromagnet core sealing plate
Side, the top of the axle sleeve are connected with clutch supporting plate.
2. a kind of electromagnetic clutch according to claim 1, it is characterised in that: the bottom surface top side of the electromagnetism fixed frame is just
Suction column is helped for the position setting of the axle sleeve, the top surface for helping suction column is provided with to match with the axle sleeve lower shape
Locating slot.
3. a kind of electromagnetic clutch according to claim 2, it is characterised in that: the bottom end of the axle sleeve is coniform.
4. a kind of electromagnetic clutch according to claim 2, it is characterised in that: the axle sleeve is along wherein axis direction by upper
The first hollow channel and the second hollow channel are disposed under, first hollow channel is mutually interconnected with the second hollow channel
Logical, the internal diameter of first hollow channel is greater than the internal diameter of second hollow channel, and the top of first hollow channel is solid
Surely it is connected with shaft-cup, central spindle is provided in first hollow channel, the top exterior walls of the central spindle are provided with limit section, described
The outer diameter for limiting section is greater than the internal diameter of second hollow channel, and it is hollow logical that the bottom end of the central spindle sequentially passes through described second
Road helps the bottom surface for inhaling column, electromagnetism fixed frame, and the top of the central spindle is socketed with buffer spring, and the top of the buffer spring is supported
It is connected to the bottom surface of the shaft-cup, the bottom end of the buffer spring is connected to the top surface of the limit section.
5. a kind of electromagnetic clutch according to claim 4, it is characterised in that: the two sidewalls of the cavity are provided with cunning
The central axes in road, the slideway and the axle sleeve are parallel to each other, and the clutch supporting plate includes being respectively arranged at two slideways
Interior slide bar, is connected with connecting rod between the bottom end of two slide bars, and the connecting rod is set to the lower section of the central spindle, and two
Gag lever post is connected between the top of slide bar described in item, the top of the axle sleeve is connected to the bottom side of the gag lever post, the limit
Position bar is arc-shaped, and the circular arc opening of the gag lever post faces away from the axle sleeve side.
6. a kind of electromagnetic clutch according to claim 5, it is characterised in that: along the gag lever post in the gag lever post
Arc length direction is provided with curved channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910034764.5A CN109681041A (en) | 2019-01-15 | 2019-01-15 | A kind of electromagnetic clutch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910034764.5A CN109681041A (en) | 2019-01-15 | 2019-01-15 | A kind of electromagnetic clutch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109681041A true CN109681041A (en) | 2019-04-26 |
Family
ID=66192327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910034764.5A Pending CN109681041A (en) | 2019-01-15 | 2019-01-15 | A kind of electromagnetic clutch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109681041A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3325139A (en) * | 1963-11-15 | 1967-06-13 | Eldima A G | Electromagnetic driving magnet |
| JP2001143927A (en) * | 1999-11-16 | 2001-05-25 | Aichi Electric Co Ltd | Device for reducing noise of solenoid |
| DE102005056435A1 (en) * | 2005-11-26 | 2007-06-06 | Harting Automotive Gmbh & Co. Kg | Locking device for a magnetic lifting system having a functional armature and a locking armature separated by a sleeve |
| CN101162640A (en) * | 2007-09-04 | 2008-04-16 | 曹湛斌 | Magnetic core structure of bistable electro-magnet for intelligent lockset |
| US20080308761A1 (en) * | 2007-06-18 | 2008-12-18 | Smc Corporation | Two-port solenoid valve |
| CN201723004U (en) * | 2010-04-13 | 2011-01-26 | 宁波瑞仕特自动门技术有限公司 | Electromagnetic lock core |
| CN203931706U (en) * | 2014-07-03 | 2014-11-05 | 宁波丰欣电磁科技有限公司 | The electromagnet that a kind of stroke is adjustable |
| CN104485195A (en) * | 2014-12-24 | 2015-04-01 | 常熟开关制造有限公司(原常熟开关厂） | Electromagnet with buffer structure |
| CN205318952U (en) * | 2015-12-02 | 2016-06-15 | 宁波兴茂电子科技有限公司 | Electronic lock electro -magnet |
| CN209761062U (en) * | 2019-01-15 | 2019-12-10 | 广东南帆智能家居有限公司 | Electromagnetic clutch |
-
2019
- 2019-01-15 CN CN201910034764.5A patent/CN109681041A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3325139A (en) * | 1963-11-15 | 1967-06-13 | Eldima A G | Electromagnetic driving magnet |
| JP2001143927A (en) * | 1999-11-16 | 2001-05-25 | Aichi Electric Co Ltd | Device for reducing noise of solenoid |
| DE102005056435A1 (en) * | 2005-11-26 | 2007-06-06 | Harting Automotive Gmbh & Co. Kg | Locking device for a magnetic lifting system having a functional armature and a locking armature separated by a sleeve |
| US20080308761A1 (en) * | 2007-06-18 | 2008-12-18 | Smc Corporation | Two-port solenoid valve |
| CN101162640A (en) * | 2007-09-04 | 2008-04-16 | 曹湛斌 | Magnetic core structure of bistable electro-magnet for intelligent lockset |
| CN201723004U (en) * | 2010-04-13 | 2011-01-26 | 宁波瑞仕特自动门技术有限公司 | Electromagnetic lock core |
| CN203931706U (en) * | 2014-07-03 | 2014-11-05 | 宁波丰欣电磁科技有限公司 | The electromagnet that a kind of stroke is adjustable |
| CN104485195A (en) * | 2014-12-24 | 2015-04-01 | 常熟开关制造有限公司(原常熟开关厂） | Electromagnet with buffer structure |
| CN205318952U (en) * | 2015-12-02 | 2016-06-15 | 宁波兴茂电子科技有限公司 | Electronic lock electro -magnet |
| CN209761062U (en) * | 2019-01-15 | 2019-12-10 | 广东南帆智能家居有限公司 | Electromagnetic clutch |
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