CN109920665A - A kind of electromagnetism axle-centre lock electric power switch unit - Google Patents
A kind of electromagnetism axle-centre lock electric power switch unit Download PDFInfo
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- CN109920665A CN109920665A CN201910310246.1A CN201910310246A CN109920665A CN 109920665 A CN109920665 A CN 109920665A CN 201910310246 A CN201910310246 A CN 201910310246A CN 109920665 A CN109920665 A CN 109920665A
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Abstract
The present invention discloses a kind of electromagnetism axle-centre lock electric power switch unit, it includes the first electromagnet, armature and contact assembly, the armature Elastic Sliding is connected to the first electromagnet, recess is offered on the armature, the lock that energy reciprocating elastic is swung is provided on first electromagnet, when first electromagnet powers on, armature driving contact assembly is closed and lock is persistently sticked in recess, when outer power drive is latched to enable lock separate with recess, armature elastic reset and contact assembly disconnection.The switching device is by the locking to its axle center armature, so that electromagnet is without being in power-up state for a long time, to improve the service life and reliability of electromagnet, meanwhile, which also has that structure is simple, advantage of save the cost.
Description
Technical field
The present invention relates to power switch and breaker applied technical field more particularly to a kind of electromagnetism axle-centre lock power switches
Device.
Background technique
Power switch is in electrical power trans mission/distribution system for being switched off or on load circuit, for disengagement failure circuit and tool
There is the device name for switching different power supply source functions, classify by voltage class, power switch can be divided into low tension switch, height
It compresses switch, ultra-high pressure switch etc..
Existing common low-tension power switch, mostly uses greatly the closure or disconnection of solenoid actuated electrical contact, passes through
The long-time of electromagnet is attracted, and driving electrical contact is in closed state, in the power switch, in running order electromagnet
It is easy to appear phenomena such as temperature increases, to influence the service life of electromagnet.And electromagnet is when power is off, can generate magnetic
It is stagnant, so that breaking reaction speed is influenced, meanwhile, it being influenced by situations such as voltage ripple of power network, electromagnet is easy to appear malfunction,
To influence the reliability of power switch.In order to avoid the appearance of above situation, some power switches pass through mechanical interlocking device
Its working condition is locked, but these mechanical interlocking devices are bulky, circuit is complicated, higher cost, it is difficult in work
Mass production is realized in industry production.As for general low-voltage circuit breaker, can not be realized with simple, small-sized and inexpensive structure
Remote control driving and remote control monitoring function.
Summary of the invention
The technical problem to be solved in the present invention is that providing a kind of electromagnetism axle-centre lock electric power switch unit, the switching device
By the locking to its axle center armature, so that electromagnet is in power-up state without long-time, to improve making for electromagnet
Use life and reliability.Meanwhile the switching device can be applied on breaker, to increase open circuit reflection speed and controllability,
To realize remote control driving switch function.In addition, the switching device also has, structure is simple, lower-cost advantage.
In order to solve the above technical problems, the present invention adopts the following technical scheme that.
A kind of electromagnetism axle-centre lock electric power switch unit comprising have the first electromagnet, armature and contact assembly, the armature
Elastic Sliding is connected to the first electromagnet, and recess is offered on the armature, and being provided on first electromagnet can reciprocating elastic
The lock of swing, when first electromagnet powers on, armature driving contact assembly is closed and lock is persistently sticked in recess, when
When outer power drive lock is to enable lock separate with recess, armature elastic reset and contact assembly disconnection.
Preferably, it is driven with the external force for enabling lock separate with recess from manual or electromagnetic power for driving lock
It is dynamic.
Preferably, the lock is in semicircle shape setting and its center location is rotationally connected with the first electromagnet, the lock
On be provided with drive rod, drive rod spring is provided between the drive rod and the first electromagnet, the lock is separated with recess
When, the section of lock is bonded with the side of armature, when the lock is sticked within recess, two endpoints of the section of the lock
One of be located at the recess within.
It preferably, further include having lock driving mechanism, the lock driving mechanism includes the second electricity being electrically connected to each other
The magnetic end of magnet and the second driving circuit, second electromagnet is oppositely arranged with drive rod, and the drive rod is in ferromagnetism,
It is attracted when second electromagnet powers on drive rod, and drive rod driving lock is separated with recess.
It preferably, further include having lock driving mechanism, described to latch wedge shaped setting, the tip of the lock is opposite with armature
Setting, the other end are connected to lock driving mechanism by drive rod, drive rod spring, the lock are arranged on the drive rod
Driving mechanism is for driving lock reciprocating elastic to swing.
Preferably, first electromagnet includes shell and coil, and the shell is ferromagnetism shell, and the coil is set
In in shell and the two be in barrel-shaped setting, the lower end of the armature is in the barrel-shaped hollow interior Elastic Sliding.
It preferably, further include having the first driving circuit, the coil is electrically connected to first driving circuit.
Preferably, an armature spring is equipped between the armature and shell.
Preferably, the contact assembly includes one group of electrical contact and at least one set of arcing contact, the arcing contact
Arc-absorption device is connected between electrical contact, when the contact assembly starting is closed, arcing contact is prior to electrical contact
Closure, when the contact assembly starting disconnects, electrical contact is disconnected prior to arcing contact.
Preferably, the contact assembly includes the first contact, the second contact and dielectric separation plate, first contact and
Second contact is oppositely arranged and the two or alternative one are resilient contact, when the contact assembly starting disconnects, the first contact
It is disconnected with the second contact, dielectric separation plate push-in is between the two, when the contact assembly starting is closed, in the first contact and second
Before contact closure, dielectric separation plate removes between the two.
In electromagnetism axle-centre lock electric power switch unit disclosed by the invention, the first electromagnet powers on rear and makees in the engaging of lock
Under, armature driving contact assembly is maintained at closed state, can stop powering to the first electromagnet at this time, so that the first electromagnetism
Iron is not only avoided that the first electromagnet generates heat from being in power-up state, this method for a long time, and power network fluctuation can be prevented to the first electricity
The interference of magnet avoids the first electromagnet from generating malfunction, to improve its service life and unfailing performance.When user is intended to disconnect
, can be by all manual or motor drive mechanism driving lock when contact assembly, to enable lock separate with recess, armature is able to elastic multiple
Position.The beneficial effects of the present invention are by the locking to its axle center armature, so that electromagnet powers on shape without being in for a long time
State, to improve the service life and reliability of electromagnet, meanwhile, which also has that structure is simple, cost is relatively low
Advantage.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of first embodiment of the invention.
Fig. 2 is the structural schematic diagram of another state of first embodiment of the invention.
Fig. 3 is the structural schematic diagram of second embodiment of the invention.
Fig. 4 is the structural schematic diagram of another state of second embodiment of the invention.
Fig. 5 is the structural schematic diagram of third embodiment of the invention.
Fig. 6 is the structural schematic diagram of another state of third embodiment of the invention.
Fig. 7 is the structural schematic diagram of fourth embodiment of the invention.
Fig. 8 is the structural schematic diagram of another state of fourth embodiment of the invention.
Fig. 9 is the structural schematic diagram of the contact assembly in fifth embodiment of the invention.
Figure 10 is the structural schematic diagram of another state of contact assembly in fifth embodiment of the invention.
Figure 11 is the structural schematic diagram of the contact assembly in sixth embodiment of the invention.
Figure 12 is the structural schematic diagram of another state of contact assembly in sixth embodiment of the invention.
Figure 13 is the structural schematic diagram of the contact assembly in seventh embodiment of the invention.
Figure 14 is the structural schematic diagram of another state of contact assembly in seventh embodiment of the invention.
Figure 15 is the circuit structure diagram of the arc-absorption device in seventh embodiment of the invention.
Figure 16 is the structural schematic diagram of the contact assembly in eighth embodiment of the invention.
Figure 17 is the structural schematic diagram of another state of contact assembly in eighth embodiment of the invention.
Figure 18 is the structural schematic diagram of the contact assembly in ninth embodiment of the invention.
Figure 19 is the structural schematic diagram of another state of contact assembly in ninth embodiment of the invention.
Figure 20 is the structural schematic diagram of the contact assembly in tenth embodiment of the invention.
Figure 21 is the structural schematic diagram of another state of contact assembly in tenth embodiment of the invention.
Specific embodiment
The present invention is described in more detail with reference to the accompanying drawings and examples.
The present invention discloses a kind of electromagnetism axle-centre lock electric power switch unit, and specific structure is referring to following examples.
Embodiment 1:
In conjunction with shown in Fig. 1 and Fig. 2, which includes the first electromagnet 1, armature 2 and touching
Head assembly 3,2 Elastic Sliding of armature are connected to the first electromagnet 1, and recess 4, first electromagnetism are offered on the armature 2
The lock 5 that energy reciprocating elastic is swung is provided on iron 1, when first electromagnet 1 powers on, armature 2 drives contact assembly 3 to be closed
And lock 5 is persistently sticked in recess 4, and when outer power drive lock 5 is to enable lock 5 separate with recess 4,2 elastic reset of armature
And contact assembly 3 disconnects.Wherein, for driving lock 5 to enable 5 external force isolated with recess 4 of lock from manual or electricity
Magnetomotive driving.After first electromagnet 1 powers on, under the snap-in function of lock 5, armature 2 drives contact assembly 3 to be maintained at and closes
Conjunction state can stop powering to the first electromagnet 1 at this time, so that the first electromagnet 1 from being in power-up state, the party for a long time
Method is not only avoided that the first electromagnet 1 generates heat, and can prevent power network fluctuation from avoiding the first electromagnet to the interference of the first electromagnet 1
Malfunction is generated, to improve its service life and unfailing performance.It, can be by all manually when user is intended to breaking-off contact component 3
Or electromagnetic drive motivation structure driving lock 5, to enable lock 5 separate with recess 4, armature 2 is able to elastic reset.
The lock 5 is arranged in semicircle shape and its center location is rotationally connected with the first electromagnet 1, sets on the lock 5
It is equipped with drive rod 50, drive rod spring 51, the lock 5 and recess 4 are provided between the drive rod 50 and the first electromagnet 1
When separation, latches 5 section and be bonded with the side of armature 1, when the lock 5 is sticked within recess 4, the section of the lock 5
One of two endpoints be located within the recess 4, the drive rod 50 and drive rod spring 51 for realizing lock 5 reciprocating elastic
It swings.
In the present embodiment, first electromagnet 1 includes shell 11 and coil 10, and the shell 11 is ferromagnetism shell
Body, the coil 10 is set in shell 11 and the two is in barrel-shaped setting, and the lower end of the armature 2 is in the barrel-shaped hollow interior bullet
Property sliding.The switching device further includes having the first driving circuit 12, and the coil 10 is electrically connected to first driving circuit 12, institute
State the first driving circuit 12 for control the first electromagnet 1 power on or power down.Between the upper end and shell 11 of the armature 2
Equipped with an armature spring 7, and realize by the armature spring 7 Elastic Sliding of armature 2.
Embodiment 2:
In conjunction with shown in Fig. 3 and Fig. 4, the present embodiment the difference from embodiment 1 is that, the electromagnetism axle-centre lock electric power switch unit
It further include having lock driving mechanism 6, the lock driving mechanism 6 includes that the second electromagnet 60 and second being electrically connected to each other drives
Dynamic circuit 61, magnetic end and the drive rod 50 of second electromagnet 60 are oppositely arranged, and the drive rod 50 is in ferromagnetism, described
It is attracted when second electromagnet 60 powers on drive rod 50, and the drive rod 50 driving lock 5 is separated with recess 4, described second drives
Motivation structure 61 is powered on for the second electromagnet 60 of control or power down, so that further control drive rod 50 is swung.
Embodiment 3:
In conjunction with shown in Fig. 5 and Fig. 6, as a kind of alternative solution of embodiment 2, the electromagnetism axle-centre lock electric power switch unit is also
It include to latch driving mechanism 6,5 wedge shaped settings of the lock, tip and the armature 2 of the lock 5 is oppositely arranged, the other end
It is connected to lock driving mechanism 6 by drive rod 50, drive rod spring 51, the lock driving are arranged on the drive rod 50
Mechanism 6 is for driving 5 reciprocating elastics of lock to swing.In practical application, which can be solenoid valve, electromagnet,
Or other power mechanisms with same driving capability.
Embodiment 4:
Referring to figs. 7 and 8, as a kind of alternative solution of embodiment 2, the difference of the present embodiment and embodiment 2 exists
In the support arm that drive rod 50 is mutually flexibly connected by two is constituted, after one end of drive rod 50 is arranged with drive rod spring 51, even
It is connected to lock driving mechanism 6, the other end of drive rod 50 is connected to lock 5, and lock driving mechanism 6 passes through lever drive principle
By power transmission to lock 5, enable to latch 5 reciprocally swingings.
Embodiment 5:
In conjunction with shown in Fig. 9 and Figure 10, the contact assembly 3 includes one group of electrical contact and at least one set of arcing contact,
Arc-absorption device 305 is connected between the arcing contact and electrical contact, when the starting of contact assembly 3 is closed, arc extinguishing
Contact is closed prior to electrical contact, and when the starting of contact assembly 3 disconnects, electrical contact is disconnected prior to arcing contact.In contact
In 3 closing course of component, since arcing contact is closed prior to electrical contact, so electric arc caused by the arcing contact first transmits
It to arc-absorption device 305, and is absorbed by arc-absorption device 305, avoids generating electric arc when electrical contact is closed；The touching
Head assembly 3 is in disconnection process, since electrical contact is disconnected prior to arcing contact, so electric arc caused by the electrical contact is first
It is transmitted to arc-absorption device 305, and is absorbed by the arc-absorption device 305, to avoid the production when electrical contact disconnects
Raw electric arc.For more efficient raising arc extinguishing ability, the quantity of the arcing contact is multiple groups, when the contact assembly 3 is closed,
Multiple groups arcing contact is successively closed, and when the contact assembly 3 disconnects, multiple groups arcing contact is successively disconnected.It can by above procedure
To find out, which realizes the on/off control to contact and the absorption to electric arc in a manner of asynchronous, not only
Arc extinction performance is good, and structure is simple, low in cost.
The contact assembly 3 includes the first contact 301 and the second contact 302 being oppositely arranged, institute in practical applications
Stating arcing contact includes the arcing contact 303 being oppositely arranged and resilient contact 304, and the contact assembly 3 includes conduction material
The contact supporting 300 of material, first contact 301 and arcing contact 303 are all set on contact supporting 300, the arc extinguishing touching
Point the distance between 303 and resilient contact 304 are less than the distance between the first contact 301 and the second contact 302.The contact branch
Frame 300 is equipped with a shaft 307, and the contact supporting 300 can be rotated around the shaft 307 in predetermined angle.Power switch
Arcing contact and electrical contact can be enable to be closed or break by driving the contact supporting 300 to rotate in predetermined angle
It opens.
In the present embodiment, the resilient contact 304 is set on an elastic piece 306, also can be set spring etc. other
On the elastomeric element of type.
Embodiment 6:
As a kind of alternative solution of embodiment 5, in conjunction with shown in Figure 11 and Figure 12, the difference of the present embodiment and embodiment 5
It is, push rod 308 is fixed on the contact supporting 300, and the push rod 308 is used to that contact supporting 300 to be driven to move back and forth, with
Enable contact supporting 300 that the first contact 301 and arcing contact 303 is driven to be closed respectively with the second contact 302 and resilient contact 304.
Embodiment 7:
As a kind of alternative solution of embodiment 5, in conjunction with shown in Figure 13 and Figure 14, the difference of the present embodiment and embodiment 1
Be, further include having insulating knockout pin 311, the electrical contact and arcing contact are button switch, the insulating knockout pin 311 to
When preceding mobile, arcing contact and electrical contact are successively closed, when the insulating knockout pin 311 moves backward, electrical contact and arc extinguishing
Contact successively disconnects.
It should be noted that arc-absorption device 305 involved in above-described embodiment 5 to embodiment 7 is in practical application
In, it can be the combination of resistance, capacitor or the two, be also possible to surge absorber.In addition, the arc-absorption device 305 is also
It can be as shown in figure 15 comprising have control circuit 309, resistance R1 and bidirectional triode thyristor D1, the resistance R1 and two-way controllable
Silicon D1 series connection after, be connected between arcing contact and electrical contact, the control signal output of the control circuit 309 with it is two-way
The control terminal of silicon-controlled D1 is connected.The control circuit 309 for exporting control instruction, to drive bidirectional triode thyristor D1 to be connected or
Cut-off, to control the on-state of resistance R1.
Embodiment 8:
In conjunction with shown in Figure 16 and Figure 17, the contact assembly 3 includes the first contact 301, the second contact 302 and insulation
Demarcation plate 321, first contact 301 and the second contact 302 are oppositely arranged and the two or alternative one are resilient contact, institute
When stating the starting disconnection of contact assembly 3, first contact 301 and the second contact 302 are disconnected, both push-in of dielectric separation plate 321
Between, when the starting of contact assembly 3 is closed, before the first contact 301 and the second contact 302 closure, dielectric separation plate 321
It removes between the two.
In order to realize that the first contact 301 and the second contact 302 efficiently separate and dielectric separation plate 321 is effectively by electric arc
Cutting, first contact 301 are fixed in the first support plate 31, and the second support plate 32 is fixed in second contact 302
On, a contact drive block 320 is equipped between first support plate 31 and the second support plate 32, the contact drive block 320
Lower end is wider than end thereon, and the dielectric separation plate 321 is fixed on the lower end of the contact drive block 320, and the contact is driven
When the upper-end part of driving of motion block 320 is between the first support plate 31 and the second support plate 32, the first contact 301 and the second contact 302
Closure；When the lower end of the contact drive block 321 struts the first support plate 31 and the second support plate 32, the first contact 301
It is disconnected with the second contact 302 and dielectric separation plate 321 is pushed into therebetween.
Embodiment 9:
In conjunction with shown in Figure 18 and Figure 19, the present embodiment and the difference of embodiment 8 are, the dielectric separation plate 321 is wedge
Shape plate, when the dielectric separation plate 321 is pushed between the first contact 301 and the second contact 302, the wedge shape of dielectric separation plate 321
End struts the two.
In the present embodiment, the tapered end of the dielectric separation plate 321 is bevelled tip-shape in side band.
Embodiment 10:
In conjunction with shown in Figure 20 and Figure 21, as a kind of alternative solution of embodiment 9, the difference of the present embodiment and embodiment 9
It is, the tapered end of the dielectric separation plate 321 is in two sides with bevelled tip-shape.
It should be noted that above-described embodiment 8,9 and 10 is only preferred embodiment of the invention, it is not limited to this
Invention, under other embodiments of the invention, the first contact 301 and the second contact 302 can also be in the drivings of other external force
Effect is lower to be disconnected or closure, and similarly, dielectric separation plate can also be by electrically driven or be manually pushed back into or remove two
Between a contact.Therefore, equivalent replacement etc. made on basis herein, should all be within protection scope of the present invention.
In electromagnetism axle-centre lock electric power switch unit disclosed by the invention, by the locking to its axle center armature, so that electromagnetism
Iron without being in power-up state for a long time, so that the service life and reliability of electromagnet are improved, meanwhile, the switching device is also
Advantage simple with structure, lower-cost.Herein on basis, which also uses asynchronous arc quenching method, so that
The generated electric arc in closure or disconnection process of contact assembly 3 can be absorbed by arc-absorption device, so as to avoid
Damage of the electric arc to contact；Alternatively, the electric arc between contact is elapsed or even is cut off using dielectric separation plate 321, so that contact
Between effectively insulated.In conjunction with the above several points can be seen that the present invention power switch technical field achieve it is biggish into
Step, and there are preferable market prospects.
The above is preferred embodiments of the present invention, is not intended to restrict the invention, all in technology model of the invention
Interior done modification, equivalent replacement or improvement etc. are enclosed, should be included in the range of of the invention protect.
Claims (10)
1. a kind of electromagnetism axle-centre lock electric power switch unit comprising have the first electromagnet, armature and contact assembly, feature exists
In the armature Elastic Sliding is connected to the first electromagnet, and recess is offered on the armature, is provided on first electromagnet
The lock that energy reciprocating elastic is swung, when first electromagnet powers on, armature drives contact assembly closure and lock persistently engaging
In in recess, when outer power drive is latched to enable lock separate with recess, armature elastic reset and contact assembly disconnection.
2. electromagnetism axle-centre lock electric power switch unit as described in claim 1, which is characterized in that for driving lock to enable lock
The external force separated with recess is from the driving of manual or electromagnetic power.
3. electromagnetism axle-centre lock electric power switch unit as described in claim 1, which is characterized in that the lock is arranged in semicircle shape
And its center location is rotationally connected with the first electromagnet, and drive rod, the drive rod and the first electromagnetism are provided on the lock
Drive rod spring is provided between iron, when the lock is separated with recess, the section of lock is bonded with the side of armature, the lock
When buckle is together within recess, one of two endpoints of the section of the lock are located within the recess.
4. electromagnetism axle-centre lock electric power switch unit as claimed in claim 3, which is characterized in that further include having lock driving machine
Structure, the lock driving mechanism includes the second electromagnet and the second driving circuit being electrically connected to each other, second electromagnet
Magnetic end be oppositely arranged with drive rod, the drive rod be in ferromagnetism, when second electromagnet powers on drive rod be attracted,
And drive rod driving lock is separated with recess.
5. electromagnetism axle-centre lock electric power switch unit as described in claim 1, which is characterized in that further include having lock driving machine
Structure, the wedge shaped setting of lock, tip and the armature of the lock are oppositely arranged, and the other end is connected to lock by drive rod
Driving mechanism is arranged with drive rod spring on the drive rod, and the lock driving mechanism is for driving lock reciprocating elastic to swing.
6. electromagnetism axle-centre lock electric power switch unit as described in claim 1, which is characterized in that first electromagnet includes
Shell and coil, the shell are ferromagnetism shell, and the coil is set in the housing and the two is in barrel-shaped setting, the armature
Lower end is in the barrel-shaped hollow interior Elastic Sliding.
7. electromagnetism axle-centre lock electric power switch unit as claimed in claim 6, which is characterized in that further include having the first driving electric
Road, the coil are electrically connected to first driving circuit.
8. electromagnetism axle-centre lock electric power switch unit as claimed in claim 6, which is characterized in that set between the armature and shell
There is an armature spring.
9. electromagnetism axle-centre lock electric power switch unit as described in claim 1, which is characterized in that the contact assembly includes one
Group electrical contact and at least one set of arcing contact, are connected with arc-absorption device, institute between the arcing contact and electrical contact
When stating contact assembly starting closure, arcing contact is closed prior to electrical contact, when the contact assembly starting disconnects, electrical contact
It is disconnected prior to arcing contact.
10. electromagnetism axle-centre lock electric power switch unit as described in claim 1, which is characterized in that the contact assembly includes
First contact, the second contact and dielectric separation plate, first contact and the second contact be oppositely arranged and the two or the two it
One is resilient contact, and when the contact assembly starting disconnects, the first contact and the second contact are disconnected, both dielectric separation plate push-in
Between, when the contact assembly starting is closed, before the first contact and the second contact closure, dielectric separation plate removes the two
Between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910310246.1A CN109920665B (en) | 2019-04-17 | 2019-04-17 | Electromagnetic axis lock power switch device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910310246.1A CN109920665B (en) | 2019-04-17 | 2019-04-17 | Electromagnetic axis lock power switch device |
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| CN109920665A true CN109920665A (en) | 2019-06-21 |
| CN109920665B CN109920665B (en) | 2022-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910310246.1A Active CN109920665B (en) | 2019-04-17 | 2019-04-17 | Electromagnetic axis lock power switch device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110539888A (en) * | 2019-08-30 | 2019-12-06 | 天津航天中为数据系统科技有限公司 | Automatic power-off device and method for multi-rotor unmanned aerial vehicle |
| CN114183034A (en) * | 2021-11-29 | 2022-03-15 | 江西中盾安保科技有限公司 | Stealthy lock of multiple theftproof formula controls intelligent cabinet |
| CN114300889A (en) * | 2021-12-13 | 2022-04-08 | 西安交通大学 | Household direct current plug and socket with arc extinguish chamber and operation method |
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| CN108140499A (en) * | 2015-10-08 | 2018-06-08 | Abb瑞士股份有限公司 | Switchgear |
| CN107578936A (en) * | 2017-10-11 | 2018-01-12 | 孝感汉光森源电气有限责任公司 | A kind of breaker closing locking device |
| CN107591258A (en) * | 2017-10-25 | 2018-01-16 | 邓长春 | Electromagnetic switch and its application method |
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| CN110539888A (en) * | 2019-08-30 | 2019-12-06 | 天津航天中为数据系统科技有限公司 | Automatic power-off device and method for multi-rotor unmanned aerial vehicle |
| CN110539888B (en) * | 2019-08-30 | 2021-07-13 | 天津航天中为数据系统科技有限公司 | Automatic power-off device and method for multi-rotor unmanned aerial vehicle |
| CN114183034A (en) * | 2021-11-29 | 2022-03-15 | 江西中盾安保科技有限公司 | Stealthy lock of multiple theftproof formula controls intelligent cabinet |
| CN114183034B (en) * | 2021-11-29 | 2024-01-30 | 江西中盾安保科技有限公司 | Multiple theftproof formula stealthy lock accuse intelligent cabinet |
| CN114300889A (en) * | 2021-12-13 | 2022-04-08 | 西安交通大学 | Household direct current plug and socket with arc extinguish chamber and operation method |
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| CN109920665B (en) | 2022-06-24 |
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