CN1067330A - Electric appliance with magnetic controlled isolating switch - Google Patents
Electric appliance with magnetic controlled isolating switch Download PDFInfo
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- CN1067330A CN1067330A CN 92103717 CN92103717A CN1067330A CN 1067330 A CN1067330 A CN 1067330A CN 92103717 CN92103717 CN 92103717 CN 92103717 A CN92103717 A CN 92103717A CN 1067330 A CN1067330 A CN 1067330A
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- 230000000694 effects Effects 0.000 abstract description 17
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Abstract
Isolated magnetic control switch of the present invention replaces traditional reaction spring and transmission mechanism with the magnetic control system that magnetic element constitutes, and contact is carried out Touchless manipulation, when magnet 1 is in the service position, attract each other with public magnet 2, magnet 2 overcomes the reverse suction of counter-force magnet 4, moves downward rapidly, drives the contact disjunction, and maintenance off-state, after magnet 1 is removed, drive magnetic force and disappear, magnet 2 and 4 effects, magnet 2 upwards returns rapidly and makes contact closure, and is kept closed.Magnetic switch is by independently magnetic control contact system and operated by magnetic force system form mutually.Magnetic switch can adopt various arc quenching methods and seal approach, has memory and half memory function, is applicable to various environment.
Description
Electric appliance with magnetic controlled isolating switch.
The technical scheme of the present invention system " electric appliance with magnetic controlled isolating switch ".The technical field that belongs to contact switch electrical equipment.
" electric appliance with magnetic controlled isolating switch " is the shortcoming at traditional contact switch electrical equipment, and the characteristic of utilizing magnetic force is reformed from principle, 26S Proteasome Structure and Function aspect existing device for switching and the novel electrical equipment of a class that forms.
In present technique known, contact switch electrical equipment is made up of contact system and actuating system two large divisions.By mechanical transmission mechanism and reaction spring, actuating system is controlled contact system, realizes switch motion.
The mode of operation of contact switch electrical equipment has operation electriomagnet, hydraulic operation, pneumatic operation, energy-stored spring operation, electric motor operated and dependent manual operation etc.
There is following shortcoming in traditional contact switch electrical equipment:
1, since contact system and actuating system by mechanical connection and frequent movement, for the seal protection of contact system with adopt effective arc extinguishing measure to bring difficulty.Adopt bellows to seal as vaccum electric apparatus as mechanical elasticity, the manufacturing process complexity, the cost height, clearance between open contacts is limited, has limited the range of application and the superiority of vaccum electric apparatus and gives full play to.SF6 breaker mechanism complexity, the sealing difficulty, fault is frequent, Operation and Maintenance complexity etc.Common open type device for switching is poor to adaptive capacity to environment, and the contact vulnerable to pollution reduces useful life and causes contact fault.
2, the gearing and the tripping mechanism of the electromagnet of traditional contact switch electrical equipment employing heaviness, reaction spring, complexity make the switching device complex structure, and volume and weight is big, the manufacturing cost height, and energy-consuming consumptive material is many.Be in operation and frequently clash into, vibrate, wear and tear, have a strong impact on the dynamo-electric life-span of device for switching.
The objective of the invention is shortcoming, start with, the 26S Proteasome Structure and Function of traditional device for switching is reformed significantly, so that further improve the technical merit and the serviceability of device for switching from the character and the action principle that change actuating force at existing device for switching.
Design of the present invention is a special nature of utilizing magnetic force, give full play to the advantage of permanent magnet, control replacement electromagnet reaction spring mechanism, replace mechanical contact effect with contactless effect with magnetic force, change original device for switching structure, form novel magnetic switch electrical equipment.
Concrete reform measure of the present invention is with the fixing permanent magnet replacement of the reaction spring of device for switching, to be called the counter-force magnet; Change armature into movable permanent magnet (or magnetic induction body), be called public magnet; Public magnet is coupled together with pull bar and moving contact, so just constituted a magnetic control contact system drive magnet or permanent magnet (title magnet) and operating means thereof and constituted the magnetic operating system.Magnetic control contact system and magnetic operating system are system independently mutually.With two independently system in combination get up just to have constituted electric appliance with magnetic controlled isolating switch.When the magnet of actuating system and the public magnet of contact system are done the time spent, public magnet drives the contact action.When driving magnetic force and disappear, public magnet is subjected to the counter-force magnet oppositely to attract to drive contact to recover, finished switch motion.
Cooperate with other protection components and magnetic switch electrical equipment,,, can reach quick, accurate, reliable protection purpose with the magnetic force delivery mode by the control electromagnet.
Below the isolated magnetic control vacuum circuit-breaker controlled with permanent magnetism be example, elaborate.Isolated magnetic control vacuum circuit-breaker operation principle.
Accompanying drawing one is a magnetic control vacuum circuit-breaker principle schematic.
The magnetic control contact system is divided into contact chamber (arc control device) and magnetic control chamber two parts.The magnetic force control system magnet of only drawing.Operating means slightly.
The number in the figure meaning:
1-magnet 6-sliding bearing 12-division board
The public magnet 7-of 2-moving contact (nonferromagnetic)
3-insulated tension pole 8-fixed contact 13-operates pull bar
4-counter-force magnet 9-conducting rod 14-contacts the chamber
(magnetic induction body) 10-radome (arc control device)
5-touch spring 11-shell 15-magnetic control chamber
By accompanying drawing one as can be known, when magnet 1 is in the service position and public magnet 2 attract each other, 2 have overcome the reverse suction of counter-force magnet 4, move downward rapidly, drive the contact disjunction, and keep off-state by 1 and 2 suction.After magnet 1 is removed, drive magnetic force and disappear, public magnet 2 and 4 effects of counter-force magnet, 2 upwards return rapidly and make contact closure and keep stable closure state by 2 and 4 suction.
The pull characteristics of magnetic control vacuum circuit-breaker and spring load characteristic.
Accompanying drawing two a are depicted as the pull characteristics and the spring load characteristic schematic diagram of above-mentioned magnetic control vacuum circuit-breaker.Ordinate F among the figure
XAnd F
FRepresent suction and counter-force respectively, abscissa L table magnet pitch from.A, B are respectively the position of magnet 1 and counter-force magnet 4, and C, D are respectively the position after public magnet 2 adhesives and the release, and curve 1 is pull characteristics, and curve 2 is a spring load characteristic.As seen from the figure, when driving the magnetic force disappearance, the accelerated motion under the counter-force effect of public magnet turns back to position D; Public magnet has overcome counter-force accelerated motion in-position C when driving magneticaction.Suitably select the magnetic energy of each magnet of magnetic control system and regulate A, B, each position of C, D, can satisfy the required manipulation force of all kinds of switches.
B is the pull characteristics and the spring load characteristic schematic diagram of traditional electromagnetic switch electrical equipment.By the contrast of scheming a and b force characteristic as can be seen, the hurried increase of magnetic switch electrical equipment suction in attracting process, counter-force is hurried to be reduced; The hurried increase of counter-force in dispose procedure.The force characteristic of this specific character and traditional electromagnetic switch has essential distinction.Therefore, the magnetic switch electrical equipment contact stabilization that is swift in motion has the magnetic padlock effect.
According to purposes and specific requirement, the actuating mode of magnetic switch electrical equipment has permanent magnetic operating, the actuating of direct current polarization electromagnet, and the actuating of direct current double-coil electromagnet exchanges various actuating modes such as double-coil electromagnet actuating.The operational power of permanent magnetic operating mode has electromagnetism, hydraulic pressure, pneumatic, energy-stored spring, motor, manpower etc.
Nd-Fe-Bo permanent magnet material is known as " magnetic king ", adopts neodymium iron boron can make device miniaturization, lightweight, high efficiency.
Because the magnetic control contact system constitutes an independent system, can make vacuum type, gas-filled type, hermetic type as required, sealing is folding and open type.Can take various arc extinguishing measures, both can improve the performance of device for switching, can enlarge the scope of application again.The magnetic switch electrical equipment of different types can be applied to particular job conditions such as general industry condition and mine, metallurgy, chemical industry, boats and ships, aviation.
Utilize the magnetic padlock effect of permanent magnet, magnetic switch electrical equipment can be made memory-type and half memory-type (energy-saving), to realize the operation of electric power system energy-saving silencing.
Because magnetic switch electrical equipment and traditional device for switching have common design feature, promptly are made up of contact system and actuating system.Therefore, magnetic switch electrical apparatus technology scheme goes for high-low pressure power transmission and distribution and control protection system.As high-low pressure circuit breaker, automatic switch, contactor, relay, button and various manual operation switch.Because the magnetic control electrical structure is simple, reliable operation, has good memory function, accommodative ability of environment is strong, and is easy to operate, can be used for replacing the not device for switching of frequent movement such as isolating switch, on-load switch and disconnecting link switch.
Electric appliance with magnetic controlled isolating switch of the present invention is compared with traditional contact switch electrical equipment, has following substantive distinguishing features and marked improvement.
1, adopts magnetic force to control, cancelled complicated mechanism, heavy iron core and reaction spring.Its result is simplified structure significantly, reduced volume, and weight reduction cuts down the consumption of energy, and economical with materials is eliminated noise, alleviates vibration, reduces production costs, and improves the dynamo-electric life-span.
2, adopt magnetic force noncontact type of action, make magnetic control contact system and magnetic operating system realize that mechanism isolates.Its result makes contact system constitute independently system, can easily take protection and arc extinguishing measures such as vacuum, inflation, sealing.This improves breaking capacity to increasing clearance between open contacts, improves the dynamo-electric life-span, strengthens environmental resistance, and it is significant to enlarge range of application (comprising the direct current disjunction).
3, adopt protection component and magnetic switch electrical matching to use, realize route protection with the magnetic force delivery mode, can improve rapidity, the sensitivity of protection, reliability has been exempted the complex mechanism of mechanical dropout simultaneously, has simplified operation.
4, utilize the magnetic padlock effect of permanent magnet can realize that the permanent magnetism of magnetic switch electrical equipment keeps, and obtains memory function.Work of relay crawl and contactor memory work cooperate, and can make operation power realize memorize.
Application example (description of drawings of holding concurrently).
Example one, isolated magnetic control vacuum circuit-breaker.
Accompanying drawing three is depicted as isolated magnetic control vacuum circuit-breaker (outdoor type) schematic diagram.
A is the T type, and b is the Y type.The magnetic control contact system is made up of contact chamber (vacuum interrupter) 12 and magnetic control chamber 13.Contact the chamber by conducting rod 1, shell 2 radomes 3, fixed contact 4, moving contact 5 is formed.The magnetic control chamber is by inductor 6, insulated tension pole 7, and public magnet 8 is formed.
The magnetic operating system is by magnet 9, and power set 10, insulated tension pole and lever system 11 are formed (the pillar shell slightly).Power set 10 move up and down magnet 9 by pull bar 11, leave or arrive the service position, and public magnet is moved by 6 and 9 reciprocation, drive contact and finish a deciliter action, and the outage back keeps.
Example two, isolated magnetic control high-voltage sf6 circuit breaker.
Accompanying drawing four is isolated magnetic control high-voltage sf6 circuit breaker schematic diagram.
A is the T type, and b is the Y type.The arc control device left-right symmetric.A partly for existing arc quenching chamber structure, increases the magnetic control chamber again among the figure, and the connecting rod of public magnet and arc control device is connected, and shell is hermetically sealed, just constitutes SF6 magnetic control contact system.This circuit breaker operation principle is identical with example one, no longer describes in detail.
Example three, isolated magnetic control vacuum contactor.
Accompanying drawing five is isolated magnetic control vacuum contactor schematic diagram.
A is the permanent magnetic operating type of alternating electromagnet operation. Alternating electromagnet 1 and 2 alternating movements make magnet 4 reciprocating motions by connecting rod 3, arrive and leave the service position, and under forward and reverse suction alternating action, public magnet 5 moves up and down, and drive contact 6 and realize deciliter action and maintenance.
B is the permanent magnetic operating type of direct current double-coil electromagnet operation.
The magnetic control contact system is identical with a.The magnetic operating system is made up of d-c solenoid 1, insulation " worker " shape support 3 and permanent magnet 1 and 4.When coil produces the forward magnetizing flux because permanent magnet 1 is relative with 4 same polarities, institute so that " worker " shape support move downward.Because the effect of magnet 4 and public magnet 5 weakens, 5 move upward and make contact closure under the effect of magnetic induction body 6, and this moment, the outage back was kept by 5 and 6 suction.When producing reverse magnetizing flux.Magnet 4 rises, and public magnet 5 moves downward contact is disconnected, and the outage back is kept by 4 and 5 suction.
Employing has the neodymium-iron-boron permanent magnet of high-coercive force, selects suitable working point and adopts effective shielding measure, can make permanent magnet 1 and 4 keep magnetic property stable under the effect of alternation direct current flux.
A and b are the memory-type contactor.
C is for exchanging the direct actuating type of double-coil electromagnet.
Contact adopts the inclined-plane contact form can reduce electrodynamic action.The public inductor 2 that the magnetic control chamber is made up of the ferromagnetic substance of biplate structure, counter-force magnet 3 and auxiliary induction body 4 are formed.The biplate combination is for driving magnetic field and counter-force magnetic field are kept apart.When the energising of the main coil of electromagnet 1,2 are attracted and move downward, contact closure, and auxiliary induction body 4 produces the magnetic padlock effects with magnet 3 simultaneously, and this moment, a coil electricity was paid in the main coil outage, can keep reaching the energy-saving silencing purpose with very little magnetic potential.After paying coil blackout, because the active force disequilibrium, 2 are attracted to move upward by 3, and contact disconnects, and keeps off-state by 2 and 3 suction.This switch is half memory-type.
After replacing above-mentioned interchange double-coil electromagnet with the direct current polarization electromagnet, the permanent magnet in the polarized electromagnet has played the maintenance effect of above-mentioned pair of coil.So as long as after the forward energising adhesive, outage can keep, oppositely energising can discharge, and has obtained memory function.
Example four isolated magnetic control automatic switches.
Accompanying drawing six is isolated magnetic control automatic switch schematic diagram.
A is the permanent-magnetic operation type automatic switch of twin coil alternating electromagnet operation.When the main coil of electromagnet 1 is switched on, make magnet 4 move left to active position by leverage 2 and attract public inductor 5 to make contact closure, simultaneously spring 3 energy storage.At this moment, because 4 and 5 magnetic padlock effect, electromagnet can change into pays the coil electricity maintenance, the energy-saving silencing operation.When paying coil blackout, switch discharges and reaches the route protection purpose under the effect of spring 3.
B is a dependent manual operation permanent-magnetic operation type automatic switch.Operation principle and a are basic identical, and different is manual closing operation, the mechanical tripping protection.This automatic switch also can adopt other power to close a floodgate.
Isolated magnetic control automatic switch can adopt various arc-suppressing methods, as vacuum type, fills the SF6 formula, compressed air type, air pressing type, air-generating etc.Characteristics such as this switch has and is swift in motion, and highly sensitive, breaking capacity is big, and the dynamo-electric life-span is long, easy to operate, and accommodative ability of environment is strong.Can replace on-load switch, isolating switch, disconnecting link switch etc.
Example five, isolated magnetic control relay.
Accompanying drawing seven is isolated magnetic control relay schematic diagram:
A is a direct current polarization electromagnet actuating formula.DC electromagnet 1 setting-in permanent magnet, it is forward and reverse excitatory to carry out direct current by twin coil, and 2 and 3 are respectively public inductor and counter-force magnet.Polarized electromagnet adopts the magnetizing flux action, and permanent magnet flux keeps, and the degaussing magnetic flux discharges, and is a kind of memory-type relay.Suitably reduce permanent magnet flux, can realize half memory-type work.
B is a direct current double-coil electromagnet actuating formula relay.The forward magnetic flux attracts electromagnet 1 and public magnet 2 and moves; Counter magnetic flux makes 1 and 2 repulsions and discharges.Energy-conserving action after 4 adhesives of auxiliary magnet is a kind of half memory-type device, and the suction that suitably strengthens auxiliary magnet 4 can rely on the magnetic padlock effect to realize the outage memory work.
C is for exchanging double-coil electromagnet actuating formula relay, and operation principle is identical with the c of example three, no longer explanation.
Isolated magnetic control relay can be made into vacuum type, and forms such as sealed type are to adapt to service conditions such as aviation, boats and ships, mine.
Example six, isolated magnetic control hand switch.
Accompanying drawing eight is depicted as isolated magnetic control hand switch schematic diagram.
This class switch is used for single-phase operation circuit, and operating current is less, be mainly to adapt to fire, explosive medium, and corrosive gas, particular job conditions such as conductivity dust are used.
A is the twisting operation type switch, is used for the occasion of frequent operation.Operating grip has forward, zero-bit and reverse three positions.There are two cover switching devices to be assemblied in side by side in the shell.1 is handle among the figure, and 2 is magnet, and 5 is the counter-force magnet, and 3,4 are the magnetic induction body.Operate the position of the moving conversion driving magnet of armrest, and handle has detent mechanism to guarantee that the position is accurate.
B is plug-type operation type switch, is used for the not occasion of frequent operation.Manual mobile magnet 2 is operated, and operation principle is identical with a.This switch also can replace middle-size and small-size disconnecting link switch, adapts to particular job conditional request.
Example seven isolated magnetic control safety switches.
Accompanying drawing nine is isolated magnetic control safety switch schematic diagram.
This button can use under dangerous and harsh environmental conditions.
A is the single-point button.With finger presses button cap 1, spring 2 is compressed, and magnet 3 is the adhesive action near inductor 4.Finger is decontroled then and is discharged, and is kept by counter-force magnet 6 and inductor 5.B is a block push button.Be used for the operation of miniature motor under the specific condition.Button cap 1 is pressed, magnet 2 and the action of public magnet 3 suction shafts.Suction by inductor 5 and magnet 6 after letting go keeps.When pressing by cap 8, magnet 9 and 10 attracts, and by lever 12 magnet 7 is risen, and 6 and 7 suction make 6 to move down switch release.Make 7 to descend by spring 11 effects after letting go, the suction by 3 and 4 keeps.
Claims (8)
1, the technical scheme of the present invention system " electric appliance with magnetic controlled isolating switch " belongs to the contact switch technical field of electric appliances.
In present known prior art, contact switch electrical equipment is made up of contact system and two main parts of operating system; These two parts interknit by gearing and reaction spring, adopt the contact operation to realize switch motion.
" electric appliance with magnetic controlled isolating switch " is made up of magnetic control contact system and operated by magnetic force system.Two partly all are equipped with magnetic element and constitute mutually independently system.Rely on magneticaction, the magnetic operating system carries out noncontact to the magnetic control contact system and controls, and realizes switch motion.
2, according to the described magnetic switch electrical equipment of claim 1, it is characterized in that the magnetic control contact system by contact, touch spring, contact supporting (pull bar) arc-control device, permanent magnet, the magnetic induction body, binding post and shell are formed.
3, according to the described magnetic switch electrical equipment of claim 1, it is characterized in that the affiliated element of contact system is divided in contact chamber (arc control device) and magnetic control is indoor, constitute an independent system jointly.Therefore, the magnetic control contact system can be made vacuum type, air-sweeping type, gas-filled type, hermetic type, the various structures of protection and open type.
4, according to the described magnetic switch electrical equipment of claim 1, it is characterized in that the actuating mode of magnetic operating system has permanent magnetic operating, the actuating of direct current polarization electromagnet, the actuating of direct current double-coil electromagnet exchanges double-coil electromagnet actuating etc.In the permanent magnetic operating mode, the mechanical movement energy of permanent magnet can be electromagnet, hydraulic pressure, pneumatic.Energy-stored spring, motor and manpower etc.
5,, it is characterized in that magnetic operating system and magnetic control contact system are combined into an integral body mutually and constitute " electric appliance with magnetic controlled isolating switch " element according to the described magnetic switch electrical equipment of claim 1.The magnetic operating system carries out the magnetic force noncontact to the magnetic control contact system and controls, and realizes switch motion.
6, according to the described magnetic switch electrical equipment of claim 1.It is characterized in that control electromagnet circuit, adopt the electromagnetism delivery mode, can realize that electric power system protects automatically with protection components such as electronics control magnetic switch electrical equipment.
7, it is characterized in that according to the described magnetic switch electrical equipment of claim 1, according to instructions for use, electric appliance with magnetic controlled isolating switch can make memory type, energy-saving type and general wink the dynamic formula device.
8, according to the described magnetic switch electrical equipment of claim 1.It is characterized in that " electric appliance with magnetic controlled isolating switch " of the present invention technical scheme is applicable to the high pressure power transmission and distribution, low power supply, electric power control and the affiliated contact switch electrical equipment of protection system of being press-fitted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92103717 CN1067330A (en) | 1992-05-17 | 1992-05-17 | Electric appliance with magnetic controlled isolating switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92103717 CN1067330A (en) | 1992-05-17 | 1992-05-17 | Electric appliance with magnetic controlled isolating switch |
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| Publication Number | Publication Date |
|---|---|
| CN1067330A true CN1067330A (en) | 1992-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92103717 Pending CN1067330A (en) | 1992-05-17 | 1992-05-17 | Electric appliance with magnetic controlled isolating switch |
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| Country | Link |
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| CN (1) | CN1067330A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100538949C (en) * | 2004-02-03 | 2009-09-09 | Abb有限公司 | Switching device |
| CN104485265A (en) * | 2014-12-29 | 2015-04-01 | 刁俊起 | Permanent magnet driving circuit breaker |
| CN104736370A (en) * | 2012-09-25 | 2015-06-24 | 沃尔沃建筑设备公司 | An arrangement, a method and a computer program for controlling filling of a tank |
| CN105167705A (en) * | 2015-09-23 | 2015-12-23 | 河北工业大学 | Window-cleaning robot and operation method thereof |
| CN109470280A (en) * | 2018-10-29 | 2019-03-15 | 成都齐思科技有限责任公司 | A kind of highly reliable contactless position is close to measuring device |
| CN110571103A (en) * | 2019-09-06 | 2019-12-13 | 浙江中亿豪科技有限公司 | hydraulic electromagnetic breaker belt connector |
| CN110890249A (en) * | 2018-09-08 | 2020-03-17 | 王在彬 | Magnetic force driven high-voltage switch |
| CN111627762A (en) * | 2020-04-27 | 2020-09-04 | 张丽英 | An automatic electrical engineering distribution circuit breaker |
| CN111679180A (en) * | 2020-06-11 | 2020-09-18 | 迈拓仪表股份有限公司 | Method and device for detecting on-off of magnetic control waterproof button |
| CN113851333A (en) * | 2021-09-13 | 2021-12-28 | 特沃斯(上海)实业有限公司 | Magnetic limit switch |
| CN116946718A (en) * | 2023-07-26 | 2023-10-27 | 长沙君祥科技有限公司 | Conveying bottle pipeline detection device for magnetic induction |
-
1992
- 1992-05-17 CN CN 92103717 patent/CN1067330A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100538949C (en) * | 2004-02-03 | 2009-09-09 | Abb有限公司 | Switching device |
| CN104736370A (en) * | 2012-09-25 | 2015-06-24 | 沃尔沃建筑设备公司 | An arrangement, a method and a computer program for controlling filling of a tank |
| CN104485265A (en) * | 2014-12-29 | 2015-04-01 | 刁俊起 | Permanent magnet driving circuit breaker |
| CN104485265B (en) * | 2014-12-29 | 2017-08-25 | 刁俊起 | A kind of permanent magnetic drive breaker |
| CN105167705A (en) * | 2015-09-23 | 2015-12-23 | 河北工业大学 | Window-cleaning robot and operation method thereof |
| CN110890249A (en) * | 2018-09-08 | 2020-03-17 | 王在彬 | Magnetic force driven high-voltage switch |
| CN109470280A (en) * | 2018-10-29 | 2019-03-15 | 成都齐思科技有限责任公司 | A kind of highly reliable contactless position is close to measuring device |
| CN110571103A (en) * | 2019-09-06 | 2019-12-13 | 浙江中亿豪科技有限公司 | hydraulic electromagnetic breaker belt connector |
| CN111627762A (en) * | 2020-04-27 | 2020-09-04 | 张丽英 | An automatic electrical engineering distribution circuit breaker |
| CN111627762B (en) * | 2020-04-27 | 2022-09-09 | 张丽英 | An automatic electrical engineering distribution circuit breaker |
| CN111679180A (en) * | 2020-06-11 | 2020-09-18 | 迈拓仪表股份有限公司 | Method and device for detecting on-off of magnetic control waterproof button |
| CN113851333A (en) * | 2021-09-13 | 2021-12-28 | 特沃斯(上海)实业有限公司 | Magnetic limit switch |
| CN116946718A (en) * | 2023-07-26 | 2023-10-27 | 长沙君祥科技有限公司 | Conveying bottle pipeline detection device for magnetic induction |
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