CN206503443U - A kind of Permanent-magnet lock set - Google Patents
A kind of Permanent-magnet lock set Download PDFInfo
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- CN206503443U CN206503443U CN201621170033.1U CN201621170033U CN206503443U CN 206503443 U CN206503443 U CN 206503443U CN 201621170033 U CN201621170033 U CN 201621170033U CN 206503443 U CN206503443 U CN 206503443U
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Abstract
The utility model discloses a kind of Permanent-magnet lock set, including permanent-magnetism linear motor, controller and lockset shell, the dead bolt of the power transmission shaft connection lockset of the permanent-magnetism linear motor carries out straight reciprocating motion, the controller connects and controls permanent-magnetism linear motor, permanent-magnetism linear motor includes stator module, mover assembly and motor housing, stator module and mover assembly are installed in motor housing, mover assembly includes power transmission shaft, connecting shaft support and permanent magnet, stator module includes stator core, winding skeleton and winding coil, the dead bolt structure that the utility model is directly connected to lockset by the power transmission shaft of permanent-magnetism linear motor is integral, after input current starts, stator module in motor produces the electromagnetic force that direction alternately changes, suction pushes away permanent magnet, the ejection and withdrawal of dead bolt is driven to realize the switch of lockset.
Description
Technical field
The utility model is related to a kind of field of lockset, more particularly to a kind of includes the lockset of permanent-magnet linear reciprocating motor.
Background technology
Largely had the disadvantage that using electronic lock at present：1) electronic section fault rate is high；2) control circuit is whole
Install on door leaf, easily by mechanical oscillation, the harmful effect of the various external factor such as electric field, magnetic field, and influence overall appearance；
Security is not too much high compared to mechanical anti-theft lock.Therefore, it is necessary to be further improved.
The general direct ejection and withdrawal for using electric rotating machine, driving dead bolt in existing intelligent door lock, but electric rotating machine
Larger with occlusal wear by mechanisms such as gear-box and screw mandrels, process is complicated, and complicated, cost is higher.
The coil windings of current permanent-magnetism linear motor produce electromagnetic force after being powered, and are driven with magnetic mutual action of permanent magnet
Dynamic motor transmission shaft is back and forth moved along a straight line.Existing magneto solves the overall magnetic circuit of motor usually using interior outer iron core,
The presence of interior outer iron core increases air gap between iron core and permanent magnet, iron core and iron core so that motor volume is big, air gap is big, magnetic circuit
It is imperfect to cause magnetic force and electromagnetic force to make full use of and reduce power of motor and efficiency.
Therefore urgently there is a kind of new permanent-magnetism linear motor and the technical scheme of success cleverly applied to lockset.
The content of the invention
In order to overcome the above-mentioned deficiency of prior art, the Permanent-magnet lock set that the utility model is provided passes through permanent-magnetism linear motor
The dead bolt structure that power transmission shaft is directly connected to lockset is integral, after input current starts, and the stator module in motor produces direction and handed over
For the electromagnetic force of change, suction pushes away permanent magnet, drives the ejection and withdrawal of dead bolt to realize the switch of lockset.
To realize object above, the utility model provides following technical scheme：
A kind of Permanent-magnet lock set, it is characterised in that the Permanent-magnet lock set is included outside permanent-magnetism linear motor, controller and lockset
Shell, the dead bolt of the power transmission shaft connection lockset of the permanent-magnetism linear motor carries out straight reciprocating motion, and the controller is connected and controlled
Permanent-magnetism linear motor processed.
Preferably, permanent-magnetism linear motor includes stator module, mover assembly and motor housing；The stator module and dynamic
Sub-component is installed in motor housing；Wherein：
The mover assembly includes power transmission shaft, connecting shaft support and permanent magnet；Prolong from motor internal described power transmission shaft one end
Stretch, connecting shaft support is fixedly installed in the middle part of the power transmission shaft, the permanent magnet is fixed and is embedded in connecting shaft support；
The stator module includes stator core, winding skeleton and winding coil, and stator core is fixedly installed in motor
On the inside of shell, stator core is radially arranged on tooth-shape structure composition winding skeleton, winding skeleton and sets winding coil.
Preferably, first end cap is respectively provided with inside motor housing at stator module two ends, first end cap is fixed
In stator module two ends.
Preferably, motor housing two ends are provided with the middle part of one of end cap in second end cap, second end cap
Axis hole is set, and one end of power transmission shaft passes through axis hole.
Preferably, connecting shaft support is arranged parallel to the pillar of power transmission shaft, and the pillar is provided with guide rail hole, guide rail hole and set
Guide rail, the two ends of the guide rail abut second end cap after passing through connecting shaft support.
Preferably, the end sleeve of guide rail is provided with spring；The permanent magnet is one or more layers structure, and the permanent magnet is along axle
To layering assembling.
Preferably, controller includes single-chip microcomputer, intelligent starting module and power module；
The intelligent starting module, which is received, instructs and verifies that analysis produces unlocking enabled instruction；
The single-chip microcomputer controls permanent-magnetism linear motor motion according to the unlocking enabled instruction；
The power module is that the single-chip microcomputer and intelligent starting module provide power supply.
Preferably, intelligent starting module includes password key unit, fingerprint identification unit, face identification unit, magnetic card sense
Answer the one or more in unit and barcode scanning recognition unit.
Preferably, single-chip microcomputer is also connected with wireless communication module, and the unlocking that the wireless communication module receives remote terminal is opened
Dynamic instruction.
Preferably, controller be also connected with monitoring camera-shooting module, infrared night vision module and one kind in LCD MODULE or
It is a variety of.
Compared with prior art, a kind of Permanent-magnet lock set that the utility model is provided, has the advantages that：
1) Permanent-magnet lock set that the utility model is provided is directly connected to the dead bolt of lockset by the power transmission shaft of permanent-magnetism linear motor
Structure is integral, after input current starts, and the stator module in motor produces the electromagnetic force that direction alternately changes, and suction pushes away permanent magnetism
Body, drives the ejection and withdrawal of dead bolt to realize the switch of lockset.
2) the utility model makes door lock because substituting the electric rotating machine used in existing intelligent door lock using permanent-magnetism linear motor
Structure simpler, implementation process is simple, cost is lower.The utility model straight line intelligent door lock sets energy supply control module.
3) permanent-magnetism linear motor that the Permanent-magnet lock set that the utility model is provided is used uses permanent magnet for magnetic source, permanent magnet two
Reserved outside the surface of pole and corresponding stator module is each corresponded to after reasonable air gap, effectively reduce permanent magnet and iron core, iron core and iron core
Between air gap, the electromagnetic energy for taking full advantage of generation forms complete magnetic circuit, improves the effective power and operating efficiency of motor, solves
Existing motor volume of having determined is big, air gap is big, the imperfect defect for causing magnetic force and electromagnetic force to make full use of of magnetic circuit.
4) permanent-magnetism linear motor that the Permanent-magnet lock set that the utility model is provided is used by permanent magnet by being embedded in power transmission shaft
Connecting shaft support on structure it is integral, winding coil, which is wound on stator core, constitutes stator module, and stator is fixed in shell
Side, makes the magnetic force distribution of permanent magnet uniform, and effectively reduces air gap between mover assembly and stator module, with small volume,
Power is big, energy consumption is low and the characteristics of efficiency high.
3) permanent magnet for the permanent-magnetism linear motor that the Permanent-magnet lock set that the utility model is provided is used is tied using one or more layers
Structure, is plate, multilayer magnet structure is layered assembling vertically, and the multilayer permanent magnet of motor can pass through each layer of permanent magnet
The alternately inverted process of magnetizing forms multiple opposing magnetic fields, by being interacted with the electromagnetic force that each pole of stator core is produced, realizes
The pushing away of mover assembly, drawing effect, eventually form complete motor power system, improve the operating efficiency of motor.
4) permanent-magnetism linear motor that the Permanent-magnet lock set that the utility model is provided is used passes through the stator inside motor housing
Component two ends set the first end cap, the first end cap is installed on stator module two ends and realize positioning and fixed effect, anti-fastening
The movement and loosening of sub-component；The guide rail two ends set in connecting shaft support are fastened by the second end cap, it is therefore prevented that the loosening of guide rail or axle
The movement in direction, serves the guiding and positioning action to electric mover component；Served and added in rail end using spring housing
The effect of straight line back and forth movement that is strong and promoting mover assembly.
Brief description of the drawings
It is of the present utility model by reading the detailed description made to non-limiting example made with reference to the following drawings
Other features, objects and advantages will become more apparent upon：
Fig. 1 is the structural representation of the Permanent-magnet lock set of the utility model embodiment；
Fig. 2 is the configuration schematic diagram of the permanent-magnetism linear motor of the Permanent-magnet lock set of the utility model embodiment；
Fig. 3 is the structural representation of the controller of the Permanent-magnet lock set of the utility model embodiment.
1- power transmission shafts；2- permanent magnets；3- springs；4- stator cores；The end caps of 5- first；5 '-the first end caps；Outside 6- motors
Shell；The end caps of 7- second；7 '-the second end caps；71- axis holes；8- winding coils；9- connecting shaft supports；91- pillars；100- guide rails；11-
Winding skeleton；10- permanent-magnetism linear motors；20- outer casing bases；21- dead bolts；30- controllers；31- single-chip microcomputers；32- intelligent startings
Module；33- power modules.
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that retouched
The embodiment stated is a part of embodiment of the utility model, rather than whole embodiments.Generally here described in accompanying drawing and
The component of the utility model embodiment shown can be arranged and designed with a variety of configurations.Therefore, below to attached
The detailed description of the embodiment of the present utility model provided in figure is not intended to limit claimed scope of the present utility model,
But it is merely representative of selected embodiment of the present utility model.Based on the embodiment in the utility model, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, belongs to the model of the utility model protection
Enclose.
, it is necessary to explanation in description of the present utility model, term " " center ", " on ", " under ", " interior ", the finger such as " outer "
The orientation or position relationship shown be based on orientation shown in the drawings or position relationship, be for only for ease of description the utility model and
Simplify description, rather than indicate or imply that the device or element of meaning there must be specific orientation, with specific azimuth configuration
And operation, therefore it is not intended that to limitation of the present utility model.In addition, term " first ", " second " are only used for describing purpose,
And it is not intended that indicating or implying relative importance.
In description of the present utility model, in addition it is also necessary to which explanation, unless otherwise clearly defined and limited, term " are set
Put ", " installation ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected,
Or be integrally connected；Can be mechanical connection or electrical connection；Can be joined directly together, intermediary can also be passed through
It is indirectly connected to, can is the connection of two element internals.For the ordinary skill in the art, can be according to specific feelings
Condition understands concrete meaning of the above-mentioned term in the utility model.
In addition, the technical scheme between each embodiment of the utility model can be combined with each other, but must be with ability
Domain those of ordinary skill can be implemented as basis, will be understood that when the combination appearance of technical scheme is conflicting or can not realize
The combination of this technical scheme is not present, also not within the protection domain of the utility model requirement.
The utility model is further described with exemplary embodiment below in conjunction with the accompanying drawings, wherein if it is known that technology
Detailed description for showing that feature of the present utility model is unnecessary, then omitted.
Fig. 1 is the structural representation of the Permanent-magnet lock set of the utility model embodiment, and Permanent-magnet lock set includes permanent-magnetism linear motor
10th, the outer casing base 20 of controller 30 and lockset shell, the connection progress straight line of dead bolt 21 of power transmission shaft 1 of permanent-magnetism linear motor 10 is past
Multiple motion, controller 30 connects and controls permanent-magnetism linear motor 10, and the composition one of power transmission shaft 1 of dead bolt 21 and permanent-magnetism linear motor is whole
Body, makes the more preferable more stable drive dead bolt 21 of permanent-magnetism linear motor do mechanical linear motion.
Fig. 2 is the configuration schematic diagram of the permanent-magnetism linear motor of the Permanent-magnet lock set of the utility model embodiment, and permanent magnetism is straight
Line motor 10 includes stator module, mover assembly and motor housing 6.Stator module and mover assembly are installed on motor housing 6
It is interior.Wherein：
The mover assembly includes power transmission shaft 1, connecting shaft support 9 and permanent magnet 2.Prolong from motor internal the one end of power transmission shaft 1
Stretch, connecting shaft support 9 is fixedly installed in the middle part of power transmission shaft 1.Permanent magnet 2 fix be embedded in connecting shaft support 9, permanent magnet 2 with
The structure of connecting shaft support 9 is integral.
The stator module includes stator core 4, winding skeleton 11 and winding coil 8.Wherein, stator core 4 is fixed
The inner side of motor housing 6 is installed on, stator core 4 is radially arranged tooth-shape structure and constitutes winding skeleton 11.Set on winding skeleton 11
Winding coil 8, winding coil 8 is wound on the winding skeleton 11 on the surface of stator core 4 and constitutes stator module.
Stator module is maintained a certain distance with mover assembly, and certain interval is provided between being allowed to.The utility model is provided
Electric machine structure, the magnetic force distribution of permanent magnet 2 is uniform, and effectively reduces air gap between mover assembly and stator module.It is described
Between gap between stator module and mover assembly, specially 0.2mm-0.5mm.
Inside motor housing 6 the first end cap 5 and the first end cap 5 ' are provided at both ends with stator module.First end cap 5 and
One end cap 5 ' is fixed on stator module two ends, is installed on stator module two ends and realizes positioning and fixed effect, prevents stator pack
The movement and loosening of part, it is to avoid produced problem and hidden danger in motor running.
The two ends of motor housing 6 are additionally provided with the second end cap 7 and the second end cap 7 '.Second end cap 7 and the second end cap 7 ' and electricity
Machine shell 6 is fixed and forms inner space, and stator module and mover assembly are installed on and are internally formed complete motor.Meanwhile,
The middle part of second end cap 7 sets axis hole 71, and permanent-magnetism linear motor is extended in one end of power transmission shaft 1 through axis hole 71.
The both sides of connecting shaft support 9 are provided with the pillar 91 parallel to power transmission shaft, and pillar 91 is provided with guide rail hole, guide rail hole
If guide rail 100.The two ends of guide rail 100 abut the second end cap 7 after passing through the pillar 91 of connecting shaft support 9.The two ends of guide rail 100 are fixed
It is interior in the second end cap 7 and the second end cap 7 ', and do not penetrate end cap 7 prevent guide rail loosen or direction of principal axis movement, serve to electricity
The guiding and positioning action of motor-driven sub-component.
Preferably, spring 3 is provided with the end sleeve of guide rail 100, spring 3 is enclosed on guide rail 100, serves and strengthen and promote
The effect of the straight line back and forth movement of mover assembly, further increases the operating efficiency of motor.
Permanent magnet 2 uses one or more layers structure, is plate, multilayer magnet structure is layered assembling vertically, specifically
, the permanent magnet number and the number of plies of mover assembly can be increased and decreased according to the size of power of motor and motor.The multilayer permanent magnet of motor
Multiple opposing magnetic fields can be formed by the alternately inverted process of magnetizing of each layer of permanent magnet, by being produced with each pole of stator core 4
Electromagnetic force interaction, realize the pushing away of mover assembly, drawing effect, eventually form complete motor power system.
Stator core 4 is stamped to form using silicon steel sheet, and stator core 4 includes two and more than two tooth-shape structures, is led to
Cross tooth-shape structure to laminate to form multiple tooth stator core, the tooth-shape structure of stator core 4 is bobbin 11, multiple tooth stator core pair
Should be with the two poles of the earth of permanent magnet 2 into one-to-one corresponding group coil 8 along the wound around coil of winding skeleton 11, power and motor according to needed for motor
Size requirement, may be selected the yoke portion of the axial wound stator core 4 of coil windings 8, the teeth portion of radial direction wound stator core 4 or many
The difference such as circumferencial direction wound around coil winding arrangement between the same layer teeth groove of individual stator core 4.
The quantity of stator core 4 is 1 group or more than 1 group, and the power according to needed for motor is different with motor size and selects, and is led to
Winding winding coil is crossed, after coil windings are powered, the coil of each series and parallel passes to electric current formation induced field, with permanent magnet 2
Magnetic field matches effect, and driving mover assembly produces reciprocating vibration motion, drive power transmission shaft 1 back and forth output power and form complete
Motor power system.
The permanent-magnetism linear motor that the utility model is provided has complete dynamical system, is connected by the two ends of power transmission shaft 1
External devices, realize the reciprocating compression such as cylinder device, promote, and with efficient advantage, can apply to engine, pressure
Contracting machine, air pump, oil pump, water pump, telescopic magic hand, vibration apparatus and all kinds of door locks.
Fig. 3 is the structural representation of the controller of the Permanent-magnet lock set of the utility model embodiment, and controller 30 includes monolithic
Machine 31, intelligent starting module 32 and power module 33.Intelligent starting module 32, which is received, instructs and verifies that analysis produces unlocking and started
Instruction；Single-chip microcomputer 31 controls the (not shown) of permanent-magnetism linear motor 10 to move along a straight line according to unlocking enabled instruction；Power module 33 is
Single-chip microcomputer and intelligent starting module provide power supply.
Power module 33 can be external power interface or disposable battery or TunePower.
The intelligent starting module 32 includes password key unit, fingerprint identification unit, face identification unit, magnetic card sensing
One or more in unit and barcode scanning recognition unit, carry out switch lock by a variety of intelligent unlocking modes, substantially increase lock
Intelligent and application.
Single-chip microcomputer can also connect wireless communication module, and the unlocking for receiving remote terminal by wireless communication module, which starts, to be referred to
Order, the remote switch that user can carry out lockset by the APP on mobile phone is controlled, convenient for users to use and demand.
Controller also adds monitoring camera-shooting by connecting monitoring camera-shooting module, infrared night vision module and LCD MODULE
Function, infrared night viewing function and crystal display, can also increase prompting module, such as loudspeaker, be reminded when electricity bottom
User changes or charged.
The dead bolt that the power transmission shaft of the permanent-magnetism linear motor for the Permanent-magnet lock set that the utility model is provided is directly connected to lockset is constituted
One is overall, after input current starts, and the stator module in motor produces the electromagnetic force that direction alternately changes, and suction pushes away permanent magnet, band
The switch of lockset is realized in the ejection and withdrawal of dynamic dead bolt.
The utility model makes door lock knot because substituting the electric rotating machine used in existing intelligent door lock using permanent-magnetism linear motor
Structure simpler, implementation process is simple, cost is lower.The utility model straight line intelligent door lock sets energy supply control module.
The utility model preferred embodiment is these are only, is not used to limit to the utility model, it is all of the present utility model
Modifications, equivalent substitutions and improvements for being done etc. within spirit and principle, be required to be included in protection domain of the present utility model it
It is interior.
Claims (10)
1. a kind of Permanent-magnet lock set, it is characterised in that the Permanent-magnet lock set includes permanent-magnetism linear motor (10), controller (30) and lock
Has shell, the dead bolt (21) of power transmission shaft (1) the connection lockset of the permanent-magnetism linear motor carries out straight reciprocating motion, the control
Device (30) connects and controls permanent-magnetism linear motor.
2. Permanent-magnet lock set according to claim 1, it is characterised in that the permanent-magnetism linear motor includes stator module, moved
Sub-component and motor housing (6)；The stator module and mover assembly are installed in motor housing (6)；Wherein：
The mover assembly includes power transmission shaft (1), connecting shaft support (9) and permanent magnet (2)；Described power transmission shaft (1) one end is from electricity
Extend inside machine, connecting shaft support (9) is fixedly installed in the middle part of the power transmission shaft (1), the permanent magnet (2) fixes the company of being embedded in
In bracing strut (9)；
The stator module includes stator core (4), winding skeleton (11) and winding coil (8), the fixed peace of stator core (4)
Loaded on the inside of motor housing (6), stator core (4) is radially arranged tooth-shape structure and constitutes winding skeleton (11), winding skeleton (11)
Upper setting winding coil (8).
3. Permanent-magnet lock set according to claim 1, it is characterised in that each at stator module two ends inside the motor housing
Provided with first end cap (5,5 '), first end cap (5,5 ') is fixed on stator module two ends.
4. Permanent-magnet lock set according to claim 1, it is characterised in that the motor housing two ends are provided with second end cap
The middle part of one of end cap sets axis hole (71) in (7,7 '), second end cap (7,7 '), and one end of power transmission shaft (1) is passed through
Axis hole (71).
5. Permanent-magnet lock set according to claim 4, it is characterised in that connecting shaft support (9) is arranged parallel to power transmission shaft (1)
Pillar (91), the pillar (91), which is provided with guide rail hole, guide rail hole, sets guide rail (100), and the two ends of the guide rail (100) are passed through
Connecting shaft support (9) abuts second end cap (7,7 ') afterwards.
6. Permanent-magnet lock set according to claim 5, it is characterised in that the end sleeve of the guide rail is provided with spring (3)；It is described
Permanent magnet (2) is one or more layers structure, and the permanent magnet (2) is layered assembling vertically.
7. the Permanent-magnet lock set according to any one of claim 1-6, it is characterised in that the controller (30) includes monolithic
Machine (31), intelligent starting module (32) and power module (33)；
The intelligent starting module (32), which receives, instructs and verifies that analysis produces unlocking enabled instruction；
The single-chip microcomputer (31) controls permanent-magnetism linear motor motion according to the unlocking enabled instruction；
The power module (33) is that the single-chip microcomputer (31) and intelligent starting module (32) provide power supply.
8. Permanent-magnet lock set according to claim 7, it is characterised in that the intelligent starting module (32) includes password key
One or more in unit, fingerprint identification unit, face identification unit, magnetic card sensing unit and barcode scanning recognition unit.
9. Permanent-magnet lock set according to claim 7, it is characterised in that the single-chip microcomputer (31) is also connected with wireless telecommunications mould
Block, the wireless communication module receives the unlocking enabled instruction of remote terminal.
10. Permanent-magnet lock set according to claim 7, it is characterised in that the controller (30) is also connected with monitoring camera-shooting mould
One or more in block, infrared night vision module and LCD MODULE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621170033.1U CN206503443U (en) | 2016-11-02 | 2016-11-02 | A kind of Permanent-magnet lock set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621170033.1U CN206503443U (en) | 2016-11-02 | 2016-11-02 | A kind of Permanent-magnet lock set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206503443U true CN206503443U (en) | 2017-09-19 |
Family
ID=59844100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621170033.1U Active CN206503443U (en) | 2016-11-02 | 2016-11-02 | A kind of Permanent-magnet lock set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206503443U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106320838A (en) * | 2016-11-02 | 2017-01-11 | 深圳市兆业电子科技有限公司 | Permanent-magnet lock |
| WO2018082507A1 (en) * | 2016-11-02 | 2018-05-11 | 深圳市华一传动技术有限公司 | Permanent magnet linear motor and linear vibrator |
-
2016
- 2016-11-02 CN CN201621170033.1U patent/CN206503443U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106320838A (en) * | 2016-11-02 | 2017-01-11 | 深圳市兆业电子科技有限公司 | Permanent-magnet lock |
| WO2018082507A1 (en) * | 2016-11-02 | 2018-05-11 | 深圳市华一传动技术有限公司 | Permanent magnet linear motor and linear vibrator |
| US10855155B2 (en) | 2016-11-02 | 2020-12-01 | Shenzhen Huayi Transmission Technology Co., Ltd. | Permanent magnet linear motor and linear vibrator |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 3, building 518000, building 3, Li Lang community science park, South Bay Street, Longgang District, Guangdong,, Shenzhen Patentee after: Shenzhen Huayi Transmission Technology Co. Ltd Address before: 3, building 518114, building 3, Li Lang community science park, South Bay Street, Longgang District, Guangdong,, Shenzhen Patentee before: SHENZHAO ZHAOYE ELECTRONIC TECHNOLOGY CO., LTD. |
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