CN107060525A - A kind of safe electronic coded lock of built-in ultrasonic piezoelectric vibrator array - Google Patents
A kind of safe electronic coded lock of built-in ultrasonic piezoelectric vibrator array Download PDFInfo
- Publication number
- CN107060525A CN107060525A CN201611189101.3A CN201611189101A CN107060525A CN 107060525 A CN107060525 A CN 107060525A CN 201611189101 A CN201611189101 A CN 201611189101A CN 107060525 A CN107060525 A CN 107060525A
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- China
- Prior art keywords
- piezoelectric vibrator
- lock
- ultrasonic piezoelectric
- circuit
- key
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B49/00—Electric permutation locks; Circuits therefor ; Mechanical aspects of electronic locks; Mechanical keys therefor
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B45/00—Alarm locks
- E05B45/06—Electric alarm locks
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/30—Piezoelectric or electrostrictive devices with mechanical input and electrical output, e.g. functioning as generators or sensors
Abstract
The present invention relates to antitheft equipment technical field, a kind of safe electronic coded lock of built-in ultrasonic piezoelectric vibrator array, including key, lock core, lock body and ultrasonic piezoelectric vibrator.Ultrasonic piezoelectric vibrator is to bond to get up to make curve disk-type composite oscillator through conducting resinl by a piece of piezoelectric ceramic wafer and piece of metal disk.The present invention is exactly to increase ultrasonic piezoelectric vibrator and signal processing circuit below the spring of common lock.During key is inserted, ultrasonic piezoelectric vibrator array is produced piezoelectric voltage by the pressure deformation of spring, and piezoelectric voltage is after signal processing circuit or opening door lock, or sound and light alarm.Experiments verify that easy to use, precision is high, lock itself it is highly reliable, can effectively prevent burglar from souning out, good anti-theft effect.
Description
Technical field
The present invention relates to antitheft equipment, specifically a kind of safe electronic coded lock of built-in ultrasonic piezoelectric vibrator array.
Background technology
Antitheft door and safety box (cabinet) are the important barriers for ensureing citizen's life and health and property safety.It is existing to improve anti-
Stealing the main method of the safety coefficient of lock has：Increase the quantity of the tooth of anti-theft key or change the species of key bit, such as it is bilateral
Key, cross key, flat key etc..But burglar utilizes other professional unlocking tools such as skeleton key or pin, thin wire
Repeatedly sound out, still can open easily.Then in the market occurs in that a small amount of brand-new theftproof lock, and such as grant number is
Be provided with a kind of CN204571520U utility model patent " theftproof lock ", the key bar of the theftproof lock piezoelectric ceramics battery and
Infrared receiver tube and electric pushrod are provided with infrared emission tube, the lockhole of lock core.Piezoelectricity is made pottery during key is inserted
Porcelain battery is squeezed generation energy of position, and driving infrared emission tube transmitting infrared ray, infrared receiver tube receives signal and is transmitted to
Electric pushrod, electric pushrod will join a class in the middle of the course pull-out, so as to complete unlocking process.But this method cost is high, and it is passive anti-
Steal, burglar repeatedly sound out when can not active in time alarm.And for example grant number is CN203947896U utility model patent
It is provided with " Hall safety lock ", the key bar of the theftproof lock on magnetic pole and projection module, lock body and is respectively equipped with corresponding Hall
Element and piezoelectric ceramics induction installation.After key insertion, Hall element produces Hall voltage, piezoelectric ceramics induction installation generation pressure
Piezoelectric voltage, Hall voltage and piezoelectric voltage are converted into low and high level (i.e. 0,1 data signal) by voltage comparator respectively and delivered to
Password identification circuit is alarmed after completing the identification of password, opening door lock after identification is correct, mistake.But this method is not smart enough
Really, because voltage comparator can only be converted into low and high level, false-alarm wrong report is easily caused, causes correct key not open door but,
There is inconvenience more.
The content of the invention
It is an object of the invention to overcome the shortcomings of that prior art is present, and provide a kind of built-in ultrasonic piezoelectric vibrator array
Safe electronic coded lock, increase ultrasonic piezoelectric vibrator and signal processing circuit below the spring of common lock.Key insertion
During, ultrasonic piezoelectric vibrator array is produced piezoelectric voltage by the pressure deformation of spring, and piezoelectric voltage is by signal transacting electricity
Behind road or opening door lock, or sound and light alarm.
The purpose of the present invention is completed by following technical solution.The safety of this built-in ultrasonic piezoelectric vibrator array
Electronic password lock, including key and lock core, key can be inserted into driving lock core in lock core and rotated in lock body 3, have lock chamber in lock body,
Lock intracavitary has and the one-to-one pellet of tooth on the key, is connected with pellet under spring, spring and is connected with ultrasonic piezoelectric vibrator,
Ultrasonic piezoelectric vibrator is connected by shielded conductor with signal processing circuit；Key insert during, ultrasonic piezoelectric vibrator by
The pressure deformation of spring produces piezoelectric voltage, and piezoelectric voltage is after signal processing circuit or opening door lock, or sound and light alarm.
Described ultrasonic piezoelectric vibrator is to be bonded by a piece of piezoelectric ceramic wafer and piece of metal disk through conducting resinl
Curve disk-type composite oscillator is made, the negative pole and metal disk of piezoelectric ceramic wafer bond, the another side of metal disk
Bonded with support becket.
Described piezoelectric ceramic wafer selects reception type p14 piezoelectrics, and metal disk selects invar.
Signal processing circuit includes power amplification circuit, and power amplification circuit is electrically connected with analog-digital converter ADC, and modulus turns
Parallel operation ADC13 is electrically connected with password detection circuit, and password detection circuit is electrically connected with sound light alarming circuit, meanwhile, power amplification
Circuit, analog-digital converter ADC, password detection circuit, sound light alarming circuit are and power electric connection；Ultrasonic piezoelectric vibrator formation
The piezoelectric voltage signal that array is produced is converted to data signal input password detection circuit, password inspection by analog-digital converter ADC
Password of the signal that slowdown monitoring circuit detection is received with being stored in is compared, and whether consistent sees, unanimously unlocks, otherwise unlatching sound
Optical alarm circuit.
Beneficial effects of the present invention are：A kind of safe electronic coded lock of built-in ultrasonic piezoelectric vibrator array of the present invention, makes
It is high with convenient, precision, lock itself it is highly reliable, can effectively prevent burglar from souning out, good anti-theft effect.
Brief description of the drawings
Fig. 1 is unlocking structure schematic diagram of the invention.
Fig. 2 is key figure of the invention.
Fig. 3 is the structural representation of the ultrasonic piezoelectric vibrator of the present invention.
Fig. 4 is signal processing circuit flow chart of the invention.
In figure：1- keys, 2- lock cores, 3- lock bodies, 4- locks chamber, 5- pellets, 6- springs, 7- ultrasonic piezoelectric vibrators, 8- piezoelectricity
Ceramic disks, 9- metal disks, 10- supports becket, 11- shielded conductors, 12- power amplification circuits, 13- analog-digital converters
ADC, 14- password detection circuit, 15- sound light alarming circuits, 16- power supplys, the tooth of 17- keys first, the tooth of 18- keys second, 19- keys
The 3rd tooth of spoon, 20- key bars, 21- the shank of the keys, 22- keyholes.
Embodiment
Detailed introduction is done to the present invention below in conjunction with accompanying drawing：
The safe electronic coded lock of this built-in ultrasonic piezoelectric vibrator array of the present invention, by taking unilateral tooth as an example, such as
Shown in Fig. 1, including key 1, lock core 2, lock body 3, lock chamber 4, pellet 5, spring 6, ultrasonic piezoelectric vibrator 7 and signal processing circuit.
The key 1 includes having rugged key bit on keyhole 22, the shank of the key 21 and key bar 20, key bar,
As shown in Fig. 2 for the sake of simplicity, three teeth (tooth of 17- keys first, the tooth of 18- keys second, the tooth of 19- keys the 3rd) have only been drawn,
And set the height respectively h1, h2, h3 of three teeth successively from front to back.
Key 1 can be inserted into driving lock core 2 in lock core 2 and be rotated in lock body 3, and having in lock body 3 in lock chamber 4, lock chamber 4 has and key
It is connected with the one-to-one pellet 5 of tooth on spoon 1, pellet 5 under spring 6, spring 6 and is connected with ultrasonic piezoelectric vibrator 7, excess sound pressure
Electric tachometer indicator 7 is connected by shielded conductor 11 with signal processing circuit；During key is inserted, ultrasonic piezoelectric vibrator 7 is by bullet
The pressure deformation of spring 6 produces piezoelectric voltage, and piezoelectric voltage is after signal processing circuit or opening door lock, or sound and light alarm.
Each described lock intracavitary has a pellet, a spring and a set of ultrasonic piezoelectric vibrator.Pellet connecting spring,
Spring connects ultrasonic piezoelectric vibrator.All pellets are highly consistent, and all springs are all by strictly testing and choosing carefully out
, to ensure that stiffness (stubborn) coefficient k of spring is almost consistent.
Described ultrasonic piezoelectric vibrator 7 is to be bonded by a piece of piezoelectric ceramic wafer 8 and piece of metal disk 9 through conducting resinl
To make curve disk-type composite oscillator, the negative pole and metal disk 9 of piezoelectric ceramic wafer 8 bond, metal disk 9 it is another
Simultaneously bonded with support becket 10, as shown in figure 3, piezoelectric ceramic wafer and metal disk smooth enough must could bond jail
Lean on.Beam frequency frDepending on the radius-thickness ratio of oscillator, material character and border supporting condition.
A is the constant that border supporting condition is determined in formula：A=0.467 when node is fixed；A=0.233 when periphery is fixed.
The present invention uses periphery fixation, therefore A takes 0.233.T is composite oscillator thickness, r1、r、r2Respectively the half of piezoelectric ceramic wafer
The radius in footpath, the radius of support periphery circle and metal disk, and r1≤r≤r2, the radius r of piezoelectric ceramic piece1With the half of sheet metal
Footpath r2The ratio between X=r1/r2＞ 0.7, just can make the impedance ratio of oscillator relatively low, optimal as X=1.Y is the synthesis poplar of two panels material
Family name's modulus, ρ is the integral density of two panels material, and σ is the synthesis Poisson's ratio of two panels material.In the case where boundary condition is fixed,
The change of frequency and t/r2It is directly proportional.In audible voice range, this kind of vibrator diameter is more in φ 10~φ 50mm, and gross thickness is 0.4
In the range of~0.5mm.The optimum diameter of curve disk-type composite oscillator of the present invention is φ 3mm, i.e. r=1.5mm, composite oscillator
Gross thickness most preferably t=0.45mm, wherein piezoelectric ceramic wafer thickness t1=0.2mm.Oscillation turns into be listened beyond human ear
The ultrasonic wave of power scope, can both prevent noise pollution, effectively can prevent burglar from being eavesdropped using stethoscope again.Metal disk is preferably selected
Select linear expansion coefficient and the immediate metal of piezoelectric ceramics preferably.The average linear coefficient of expansion of piezoelectric ceramics is about αl≈
2.5×10-6/ DEG C (20 DEG C), through looking into and verifying, the trade mark is 4J36 invar (Invar Steel) at Curie temperature Tc (230 DEG C)
The following average linear coefficient of expansion is about αl≈1.5×10-6/ DEG C (20 DEG C), and invar is hard, conducts electricity very well, thus it is of the invention
The material selection invar of metal disk 9.The density p of known piezoelectric ceramics1=7.6 × 103kg/m3, the density p of invar2=8.1
×103kg/m3, volume is almost equal, then integral density ρ ≈ 7.9 × 103kg/m3.The piezoelectric ceramic wafer 8 of the present invention is selected and connect
Receipts type p14 piezoelectrics, because the section bar material has higher piezoelectric strain constant d33=6.4 × 10-10C/n, it is meant that use it
The ultrasonic piezoelectric vibrator receiving sensitivity of making is higher.The free relative dielectric constant of the section bar material is
In formula, ε0For the dielectric constant of vacuum (or free space), ε0=8.85 × 10-12(F/m), ε is that absolute dielectric is normal
Number, wherein, F represents electric capacity CtUnit farad.
Absolute dielectric constant ε and element electric capacity Ct, electrode area S and electrode spacing t1Between relation be
S is electrode area m in formula2, t1For electrode spacing m, CtFor resonant capacitance F.
Analyzed below by taking a tooth as an example, after key inserts lock core, according to Hooke's law, in elastic limit, spring
Elastic force
F1=-k△H (n) (formula 4)
According to Newton force educational level interaction, then curve disk-type composite oscillator be under pressure
F=-F1=k△H (n) (formula 5)
Then curve disk-type composite oscillator produces electric charge
Q=Fd33=k△hd33(c) (formula 6)
Monolithic component is used for the curve disk-type composite oscillator of the present invention, then curve disk-type composite oscillator is produced
Raw voltage
Formula 3 is substituted into, and is obtained
Formula 2 is substituted into, and assumes that the element of curve disk-type composite oscillator of the present invention is full electrode, then
Substitute into, it is known that obtaining
U≈0.6018k△H (v) (formula 10)
In formula,△H is the change m of key tooth height.
Assuming that the power amplifier voltage amplification factor of the present invention is β, then
E=β U=0.6018 β kΔH (v) (formula 11)
B=0.6018 β k are made, then
E=B△H (v) (formula 12)
As can be seen here, the height change of voltage E of the invention only with key bit△H is relevant.
The signal processing circuit is as shown in figure 4, including power amplification circuit 12, power amplification circuit 12 and analog-to-digital conversion
Device ADC13 is electrically connected, and analog-digital converter ADC13 is electrically connected with password detection circuit 14, password detection circuit 14 and sound and light alarm
Circuit 15 is electrically connected, meanwhile, power amplification circuit 12, analog-digital converter ADC13, password detection circuit 14, sound light alarming circuit
15 electrically connect with power supply 16；The piezoelectric voltage signal that the array of the formation of ultrasonic piezoelectric vibrator 7 is produced passes through analog-digital converter
ADC13 is converted to data signal input password detection circuit 14, and password detection circuit 14 detects the signal that receives and has been stored in
Password is compared, and whether consistent sees, unanimously unlocks, otherwise open sound light alarming circuit 15.
The voltage U that curve disk-type composite oscillator is produced is very faint, first pass through power amplifier amplify β times be E after, then by mould
Number converter ADC is converted to data signal, and input password detection circuit is compared with having deposited password, unlocked if matching, no
Sound and light alarm if matching.Whole circuit needs power supply to power, and on the one hand power supply is connect on fire-fighting emergent circuit, on the other hand connects solely
On vertical dc-battery.Cause to open the door with anti-power failure, or deliberately power-off causes sound light alarming circuit slow again after failing to burglar
Slow sound out is unlocked.
In the specific implementation, as shown in figure 3, ultrasonic piezoelectric vibrator 7 is by a piece of piezoelectric ceramic wafer 8 and piece of metal circle
Piece 9 is bonded to get up to make curve disk-type composite oscillator through conducting resinl, and the negative pole and metal disk 9 of piezoelectric ceramic wafer 8 are bonded
Get up, another side and the support becket 10 of metal disk 9 are bonded.Piezoelectric ceramic wafer 8 and metal disk 9 must be smooth enough
It is firm to bond.Piezoelectric ceramic wafer 8 selects reception type p14 piezoelectrics, and metal disk 9 selects invar.Ultrasonic piezoelectricity shakes
Son 7 is connected by shielded conductor 11 with signal processing circuit.
During unlocking, in the insertion lock core 2 of key 1, as shown in Figure 1 and Figure 2, the first tooth of key 17, key second on key 1
Tooth 18, the tooth 19 of key the 3rd depress pellet 5 successively, and according to formula 12, the piezoelectric voltage that ultrasonic piezoelectric vibrator array 7 is produced is as follows
Shown in table 1：
Table 1
| Three tooth oscillator voltages | Two tooth oscillator voltages | One tooth oscillator voltage | |
| Key enters a tooth | E31=Bh1 | E21=0 | E11=0 |
| Key enters two teeth | E32=B (h2-h1) | E22=Bh1 | E12=0 |
| Key enters three teeth | E33=B (h3-h2+h1) | E23=B (h2-h1) | E13=Bh1 |
Thus table is visible, during unlocking, and the piezoelectric voltage change procedure that three tooth oscillators are produced is：E31→E32→E33, while two
Tooth oscillator produce piezoelectric voltage change procedure be：0→E22→E23, a tooth oscillator produce piezoelectric voltage change procedure be：0
→0→E13.Password detection circuit 14 exactly detect that the signal received is compared with data in the table being stored in, see whether one
Cause, unanimously unlock, otherwise open sound light alarming circuit 15.The piezoelectric voltage that ultrasonic piezoelectric vibrator array 7 of the present invention is produced
Signal is converted to data signal input password detection circuit 14 by analog-digital converter ADC13 and is compared, and precision is high, anti-theft
Sound out effect ideal.Meanwhile, original-pack key precision is high, the saltation layer relative coarseness that people's malice intentionally is matched somebody with somebody, the present invention
Also it can recognize in time and sound and light alarm, anti-theft effect is splendid.
It is understood that it will be understood by those skilled in the art that being subject to technical scheme and inventive concept
It should all belong to the protection domain of appended claims of the invention with replacing or changing.
Claims (4)
1. a kind of safe electronic coded lock of built-in ultrasonic piezoelectric vibrator array, it is characterised in that：Including key (1) and lock core
(2), key (1) can be inserted into driving lock core (2) in lock core (2) and be rotated in lock body (3), there is lock chamber (4) in lock body (3), lock chamber
(4) have in the one-to-one pellet of tooth (5) on key (1), be connected with pellet (5) under spring (6), spring (6) and connect
There is ultrasonic piezoelectric vibrator (7), ultrasonic piezoelectric vibrator (7) is connected by shielded conductor (11) with signal processing circuit；Key is inserted
During, ultrasonic piezoelectric vibrator (7) is produced piezoelectric voltage by the pressure deformation of spring (6), and piezoelectric voltage is by signal
Manage after circuit or opening door lock, or sound and light alarm.
2. the safe electronic coded lock of built-in ultrasonic piezoelectric vibrator array according to claim 1, it is characterised in that：It is described
Ultrasonic piezoelectric vibrator (7) be to bond to get up to make through conducting resinl by a piece of piezoelectric ceramic wafer (8) and piece of metal disk (9)
Curve disk-type composite oscillator, the negative pole and metal disk (9) of piezoelectric ceramic wafer (8) bond, metal disk (9) it is another
Simultaneously bonded with support becket (10).
3. the safe electronic coded lock of built-in ultrasonic piezoelectric vibrator array according to claim 2, it is characterised in that：It is described
Piezoelectric ceramic wafer (8) select reception type p14 piezoelectrics, metal disk (9) selects invar.
4. the safe electronic coded lock of built-in ultrasonic piezoelectric vibrator array according to claim 1, it is characterised in that：Signal
Process circuit includes power amplification circuit (12), and power amplification circuit (12) is electrically connected with analog-digital converter ADC (13), and modulus turns
Parallel operation ADC (13) is electrically connected with password detection circuit (14), and password detection circuit (14) is electrically connected with sound light alarming circuit (15),
Meanwhile, power amplification circuit (12), analog-digital converter ADC (13), password detection circuit (14), sound light alarming circuit (15) with
Power supply (16) is electrically connected；The piezoelectric voltage signal that the array of ultrasonic piezoelectric vibrator (7) formation is produced passes through analog-digital converter ADC
(13) data signal input password detection circuit (14) is converted to, the signal that password detection circuit (14) detection is received is with being stored in
Password be compared, whether consistent see, it is consistent if unlock, otherwise open sound light alarming circuit (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611189101.3A CN107060525B (en) | 2016-12-21 | 2016-12-21 | A kind of safe electronic coded lock of built-in ultrasonic piezoelectric vibrator array |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611189101.3A CN107060525B (en) | 2016-12-21 | 2016-12-21 | A kind of safe electronic coded lock of built-in ultrasonic piezoelectric vibrator array |
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| Publication Number | Publication Date |
|---|---|
| CN107060525A true CN107060525A (en) | 2017-08-18 |
| CN107060525B CN107060525B (en) | 2019-01-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112832640A (en) * | 2021-01-15 | 2021-05-25 | 李汉清 | Energy-saving type anti-theft door |
| CN114926924A (en) * | 2022-05-25 | 2022-08-19 | 青岛黄海学院 | Deep encryption lock terminal and method for Internet of things |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050235714A1 (en) * | 2002-04-11 | 2005-10-27 | Erik Lindstrom | Electro-mechanical cylinder lock-key combination with optical code |
| GB2492612A (en) * | 2012-02-20 | 2013-01-09 | Jeremy Ross Nedwell | Decoding a mechanical lock by detecting vibrational response of a tumbler |
| CN203947896U (en) * | 2014-07-15 | 2014-11-19 | 中国人民解放军装甲兵工程学院 | Hall safety lock |
| CN204571520U (en) * | 2015-03-23 | 2015-08-19 | 东北大学 | A kind of theftproof lock |
-
2016
- 2016-12-21 CN CN201611189101.3A patent/CN107060525B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050235714A1 (en) * | 2002-04-11 | 2005-10-27 | Erik Lindstrom | Electro-mechanical cylinder lock-key combination with optical code |
| GB2492612A (en) * | 2012-02-20 | 2013-01-09 | Jeremy Ross Nedwell | Decoding a mechanical lock by detecting vibrational response of a tumbler |
| CN203947896U (en) * | 2014-07-15 | 2014-11-19 | 中国人民解放军装甲兵工程学院 | Hall safety lock |
| CN204571520U (en) * | 2015-03-23 | 2015-08-19 | 东北大学 | A kind of theftproof lock |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112832640A (en) * | 2021-01-15 | 2021-05-25 | 李汉清 | Energy-saving type anti-theft door |
| CN114926924A (en) * | 2022-05-25 | 2022-08-19 | 青岛黄海学院 | Deep encryption lock terminal and method for Internet of things |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107060525B (en) | 2019-01-18 |
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