Passive lock system for hazardous chemical substance management cabinet

Abstract

The utility model discloses a passive lockset system used for a hazardous chemical substance management cabinet, the passive lockset system comprises a passive induction lock cylinder, an induction magnetic coil and a magnetic lock key, the induction magnetic coil is fixed on the front side of a cabinet door, the passive induction lock cylinder is fixed on the inner side of the cabinet door, the passive induction lock cylinder is located below the induction magnetic coil, and the magnetic lock key is fixed on the inner side of the cabinet door. A lock groove is formed in the side edge of the cabinet door, a main control panel is arranged in the magnetic lock key and comprises a main control module and a wireless power supply receiving module, the passive induction lock cylinder comprises a lock cylinder structure, an unlocking power structure and a driving plate, the unlocking power structure is installed above the driving plate, the driving plate is electrically connected with the unlocking power structure and the induction magnetic coil, and the main control module is connected with the main control module. The driving board comprises a motor driving module and a Hall sensing module. The passive lock system does not need to be powered by an external power supply or a built-in power supply battery, so that the safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of dangerous chemical management cabinet, specifically relates to a passive lock system for dangerous chemical management cabinet. BACKGROUND

[0002] Dangerous chemical management cabinet is the equipment for storing flammable, explosive, corrosive or toxic dangerous chemicals in the laboratory, which plays an isolating role for these chemical drugs to prevent leakage, volatilization or reaction with other substances.

[0003] At present, the dangerous chemical management cabinet usually adopts electronic password lock, fingerprint lock or traditional mechanical lock as lock, which has the following some shortcomings:

[0004] 1) Electronic password lock, fingerprint lock needs external power supply or built-in power supply battery, needs to rely on external power supply, and electronic password lock or fingerprint lock needs continuous power supply, and when power failure or battery depletion, it will not be able to open normally, leading to the situation that dangerous chemicals cannot be quickly stored and taken in emergency, and the long-term maintenance cost of electronic password lock and fingerprint lock is high;

[0005] 2) Mechanical lock is inconvenient to manage, needs to be equipped with physical key, has the risk of key loss, copying or unauthorized use by personnel, is not convenient for unified management, and if the key is lost, technical unlocking or violent unlocking of fixed cabinet lock or padlock needs a lot of time and energy. INVENTION CONTENTS

[0006] The utility model solves the technical problem in the prior art, provides a passive lock system which does not need external power supply or built-in power supply battery, saves complicated power supply wiring and power supply installation process, does not need networking operation, installation and maintenance are relatively simple, and dangerous chemicals are safe in storage and use.

[0007] To solve the above technical problems, the utility model adopts the following technical scheme:

[0008] A passive lock system for dangerous chemical management cabinet, including passive lock system arranged on the cabinet door of dangerous chemical management cabinet, the passive lock system includes passive induction lock core, induction magnetic coil, magnetic force lock key located outside the induction magnetic coil and matched with the induction magnetic coil, the induction magnetic coil is fixed to the front side of the cabinet door, the passive induction lock core is fixed to the inner side of the cabinet door, the passive induction lock core is located below the induction magnetic coil, and the side edge of the cabinet door is provided with a lock groove;

[0009] The magnetic force lock key is internally provided with a main control board, the main control board includes a main control module and a wireless power supply receiving module, and the wireless power supply receiving module is electrically connected with the main control module.

[0010] The master control module comprises a master control chip U2 and a radio frequency circuit, the model of the master control chip U2 is NRF51822, and the master control chip U2 is electrically connected with the radio frequency circuit.

[0011] The passive induction lock cylinder comprises a lock cylinder structure matched with the cabinet door lock slot, an unlocking power structure, and a driving plate, the unlocking power structure is installed above the driving plate, the lock cylinder structure is installed on one side of the unlocking power structure and the driving plate, and the driving plate is electrically connected with the unlocking power structure and the induction magnetic coil.

[0012] The driving plate comprises a motor driving module and a Hall sensor module, and the motor driving module and the Hall sensor module of the driving plate are electrically connected with the master control module of the master control board.

[0013] Further, the passive induction lock cylinder comprises a lock cylinder fixing plate, two groups of lock latches installed on the upper end face of the lock cylinder fixing plate, a linkage plate, an unlocking action bar, a sliding rail, and a sliding block, the two groups of lock latches are symmetrically distributed on the upper end face of the lock cylinder fixing plate, one end of each group of lock latches is connected to the two sides of the linkage plate, and the other end of each group of lock latches can be telescoped in the lock slot, the unlocking action bar and the sliding rail are installed between the two groups of lock latches, the unlocking action bar is installed on one side of the sliding rail, the sliding block is fixed to the middle part of the linkage plate, the sliding block is in sliding cooperation with the sliding rail, the linkage plate is provided with a limiting groove and a sliding groove facilitating the sliding block to drive the linkage plate to move along the sliding rail, the limiting groove is located on one side of the sliding groove, the top of one end of the unlocking action bar is fixed with a limiting protrusion, the bottom of one end of the unlocking action bar is provided with a spring, the spring is located below the limiting protrusion and is fixed to the lock cylinder fixing plate, the unlocking action bar can abut against the limiting groove of the linkage plate through the limiting protrusion, and the outer part of each group of lock latches is sleeved with an elastic element.

[0014] Further, the side edge of each group of lock latches is fixed with a magnet, and the magnet is located on one side of the Hall sensor module on the driving plate.

[0015] Further, the unlocking power structure comprises a micro motor and a handle matched with the unlocking action bar of the passive induction lock cylinder, the motor shaft of the micro motor is connected with the handle, and the micro motor is installed on the upper end of the driving plate and is electrically connected with the motor driving module of the driving plate.

[0016] Further, the radio frequency circuit comprises an inductor L4, an inductor L5, a capacitor C10, an inductor L3, a capacitor C12, a capacitor C13, one end of the inductor L3 is electrically connected with one end of the capacitor C10 and one end of the capacitor C12, the other end of the inductor L3 is electrically connected with the capacitor C13, the other end of the capacitor C10 is electrically connected with one end of the inductor L4, one end of the inductor L4 is also electrically connected with the 32th pin of the master control chip U2, one end of the inductor L5 is electrically connected with the other end of the inductor L4 and the 31th pin of the master control chip U2, the other end of the inductor L5 is electrically connected with the 30th pin of the master control chip U2.

[0017] Further, the wireless power supply receiving module comprises a wireless power supply receiving chip U1, an inductor L2, a Schottky diode D1, a capacitor C5, a capacitor C6, a Schottky diode D2, a power inductor L1, a resistor R3, a resistor R5, a capacitor C7, the model of the wireless power supply receiving chip U1 is T3168, the 2nd pin of the wireless power supply receiving chip U1 is electrically connected with one end of the Schottky diode D1 and one end of the capacitor C6, the two ends of the inductor L2 are respectively electrically connected with the two ends of the capacitor C5 so as to form an LC oscillation circuit, the two ends of the inductor L2 are also electrically connected with the other end of the Schottky diode D1 and the other end of the capacitor C6, the 3rd pin of the wireless power supply receiving chip U1 is electrically connected with one end of the Schottky diode D2 and one end of the power inductor L1, the 4th pin of the wireless power supply receiving chip U1 is electrically connected with the other end of the Schottky diode D2, the other end of the power inductor L1 is electrically connected with one end of the resistor R3, one end of the resistor R3 is also electrically connected with one end of the resistor R5, the other end of the resistor R3 is electrically connected with the 5th pin of the wireless power supply receiving chip U1 and one end of the capacitor C7, the other end of the capacitor C7 is electrically connected with the other end of the resistor R5.

[0018] Further, the motor driving module comprises a triode Q2, a resistor R4, a MOSFET tube Q1, a motor connecting seat P1, a Schottky diode D3, the base of the triode Q2 is electrically connected with the 43th pin of the master control chip U2 of the master control board, the two ends of the resistor R4 are respectively electrically connected with the base of the triode Q2 and the G pole of the MOSFET tube Q1, the two ends of the Schottky diode D3 are respectively electrically connected with the 1st pin and the 2nd pin of the motor connecting seat P1, the D pole of the MOSFET tube Q1 is electrically connected with the 1st pin of the motor connecting seat P1 and one end of the Schottky diode D3, the motor driving module is electrically connected with the micro motor of the unlocking power structure through the motor connecting seat P1.

[0019] Further, the Hall sensor module comprises a full-pole Hall switch P2, a resistor R7, a resistor R8 and a capacitor C18, the full-pole Hall switch P2 is of a model of HAL253UA, a third pin of the full-pole Hall switch P2 is electrically connected with one end of the resistor R8, one end of the capacitor C18 and an eleventh pin of the main control chip U2, and a second pin of the full-pole Hall switch P2 is electrically connected with one end of the resistor R7.

[0020] Further, the magnetic lock key comprises a magnetic lock shell, and the main control board is arranged in the interior of the magnetic lock shell.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] 1、 the passive lock system of the utility model includes passive induction lock cylinder, induction magnetic coil, magnetic lock key which is located outside induction magnetic coil and cooperates with induction magnetic coil, induction magnetic coil is fixed to front side of cabinet door, passive induction lock cylinder is fixed to inner side of cabinet door, passive induction lock cylinder is located below induction magnetic coil, side of cabinet door is equipped with lock groove, magnetic lock key is built -in main control board, main control board includes main control module and wireless power supply receiving module, passive induction lock cylinder includes lock cylinder structure, unlocking power structure, drive board, unlocking power structure is installed above drive board, drive board is electrically connected with unlocking power structure, induction magnetic coil, drive board includes motor drive module and hall sensor module, wireless power supply receiving module is electrically connected with motor drive module, motor drive module and hall sensor module of drive board are electrically connected with main control module of main control board.

[0023] 2、 the main control board of the utility model includes main control chip U2 and radio frequency circuit, the model of main control chip U2 is NRF51822, main control chip U2 is electrically connected with radio frequency circuit, the forty-third pin of main control chip U2 is electrically connected with motor drive module, main control chip U2 supports bluetooth low power consumption and other 2.4GHz protocol, can carry out wireless communication with terminal equipment through 2.4GHz transceiver in main control chip U2, adopts bluetooth communication, need not networking operation, avoids the risk of data leakage of the dangerous chemical product management cabinet stored due to hacker attack. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the structure schematic view of the utility model dangerous chemical product management cabinet;

[0025] Figure 2 Figure 1 is a schematic view of the relationship between the passive lock system and the cabinet door of the present application;

[0026] Figure 3 Figure 2 is a schematic view of the relationship between the passive lock system and the cabinet door of the present application from another angle;

[0027] Figure 4 Figure 3 is a schematic view of the structure of the magnetic key of the present application;

[0028] Figure 5 Figure 4 is a schematic view of the structure of the passive induction lock cylinder of the present application;

[0029] Figure 6 Figure 5 is a schematic view of the structure of the passive induction lock cylinder of the present application from another angle;

[0030] Figure 7 Figure 6 is a schematic view of the state of the bolt extension in the passive induction lock cylinder of the present application;

[0031] Figure 8 Figure 7 is a schematic view of the state of the bolt retraction in the passive induction lock cylinder of the present application;

[0032] Figure 9 Figure 8 is a circuit schematic of the main control board of the present application;

[0033] Figure 10 Figure 9 is a circuit schematic of the wireless power supply receiving module of the present application;

[0034] Figure 11 Figure 10 is a circuit schematic of the motor driving module of the present application;

[0035] Figure 12 Figure 11 is a circuit schematic of the Hall sensor module of the present application;

[0036] Figure 13 Figure 12 is a circuit schematic of the voltage stabilizing circuit module of the present application.

[0037] In the figure, passive induction lock cylinder 1, lock cylinder structure 11, elastic element 111, bolt 112, linkage plate 113, limiting groove 1131, sliding groove 1132, unlocking action bar 114, limiting protrusion 1141, sliding rail 115, sliding block 116, lock cylinder fixing plate 117, spring 118, unlocking power structure 12, micro motor 121, handle 122, motor fixing seat 123, driving plate 13, induction magnetic coil 2, magnetic key 3, main control board 31, cabinet door 4, lock slot 41, handle 42, hazardous chemical management cabinet 5. DETAILED DESCRIPTION

[0038] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0039] As shown in Figures 1-4 The utility model discloses an embodiment provides a passive lock system for dangerous chemical management cabinet 5, including being located in dangerous chemical management cabinet 5's cabinet door 4 on passive lock system, this passive lock system includes passive induction lock core 1, induction magnetic coil 2, the outside of induction magnetic coil 2 and with induction magnetic coil 2 cooperation's magnetic lock key 3, induction magnetic coil 2 is fixed on the front side of cabinet door 4, passive induction lock core 1 is fixed on the inside of cabinet door 4, passive induction lock core 1 is located below induction magnetic coil 2, and the side of cabinet door 4 is equipped with lock slot 41, and the magnetic lock key 3 is built -in main control board 31, and main control board 31 includes main control module and wireless power supply receiving module, and wireless power supply receiving module is electrically connected with main control module, and this passive induction lock core 1 includes with cabinet door 4 lock slot 41 cooperation's lock core structure, unlocking power structure 12, drive board 13, unlocking power structure 12 is installed in the upper side of drive board 13, and lock core structure is installed in unlocking power structure 12 and the one side of drive board 13, and drive board 13 is electrically connected with unlocking power structure 12, induction magnetic coil 2, wherein, drive board 13 includes motor drive module and hall sensor module, and the motor drive module of drive board 13, hall sensor module are all electrically connected with the main control module of main control board 31. When realizing specifically, the magnetic lock key 3 includes magnetic lock shell, and main control board 31 is built -in the inside of magnetic lock shell, and cabinet door 4 is installed handle 42, and by setting handle 42, it is convenient to open cabinet door 4, and the cabinet door 4 is set as transparent cabinet door 4, and it is convenient to observe the medicine situation inside dangerous chemical management cabinet 5.

[0040] The utility model discloses a main control board 31 includes main control chip U2 and radio frequency circuit, the model of main control chip U2 is NRF51822, and main control chip U2 is connected with radio frequency circuit electricity through its 32 pin, 31 pin, 30 pin, and the 43 pin of main control chip U2 is connected with motor drive module electricity. The utility model discloses a main control chip U2 adopts the model NRF51822 chip, and the inside integration of NRF51822 chip is a 2.4GHz bluetooth transceiver and an ARM Cortex-M0 core, supports bluetooth low power consumption and other 2.4GHz protocol, can carry out wireless communication with terminal equipment through the 2.4GHz transceiver of main control chip U2, and the wireless communication connection of terminal equipment of magnetic lock key 3 through main control board 31 can receive the signal sent by terminal equipment, and terminal equipment sends the signal of opening lock to magnetic lock key 3, and the inductive current of the interaction of electromagnetic induction between magnetic lock key 3 and inductive magnetic coil 2 is generated, since drive board 13 is connected with inductive magnetic coil 2 electricity, and the drive power supply of opening lock power structure 12 is converted into the drive power supply of opening lock power structure 12 through drive board 13, and the lock bolt 112 of opening lock power structure 12 drive lock core structure 11 telescopic, realizes the operation of locking and unlocking.

[0041] When being specifically realized, the main control board 31 of the utility model further includes a voltage stabilizing circuit module, the voltage stabilizing circuit module includes a voltage stabilizer LDO1, capacitors C20, C22, C19 and C21, the model of the voltage stabilizer is ME6211C33M5G, one end of the capacitor C20 is electrically connected with one end of the capacitor C22 and the first pin of the voltage stabilizer LDO1, the third pin of the voltage stabilizer LDO1 is electrically connected with one end of the capacitor C22, and the fifth pin of the voltage stabilizer LDO1 is electrically connected with one end of the capacitor C19 and one end of the capacitor C21. The voltage stabilizing circuit module is composed of the voltage stabilizer with the model ME6211C33M5G and the capacitors C20, C22, C19 and C21, the input voltage is converted into the voltage required by the main control module by using the voltage stabilizer LDO1, passive power supply of the main control module is realized, the first pin of the voltage stabilizer LDO1 is an input pin (VIN), the capacitors C20 and C22 connected with the input pin are input filter capacitors, mainly play the role of inhibiting input noise, filtering high-frequency noise and ripple from the power supply, and ensuring the stability of the input voltage; the fifth pin of the voltage stabilizer LDO1 is an output pin (VOUT), the capacitors C19 and C21 connected with the output pin are output filter capacitors, play the role of reducing the ripple of the output voltage and stabilizing the output voltage, and reduce the influence of voltage fluctuation on the system.

[0042] As Figures 5-8As shown in the utility model embodiment, the passive induction lock cylinder 1 includes a lock cylinder fixing plate 117 and two groups of lock latches 112, a linkage plate 113, an unlocking action bar 114, a sliding rail 115 and a sliding block 116 installed on the upper end face of the lock cylinder fixing plate 117. The two groups of lock latches 112 are symmetrically distributed on the upper end face of the lock cylinder fixing plate 117. One end of each group of lock latches 112 is connected to the two sides of the linkage plate 113. The other end of each group of lock latches 112 can be extended and retracted in the lock slot. The unlocking action bar 114 and the sliding rail 115 are installed between the two groups of lock latches 112. The sliding block 116 is fixed to the middle part of the linkage plate 113. The sliding block 116 is in sliding cooperation with the sliding rail 115. The unlocking action bar 114 is installed on one side of the sliding rail 115. The linkage plate 113 is provided with a limiting groove 1131 and a sliding groove 1132 for facilitating the movement of the sliding block 116 along the sliding rail 115. The limiting groove 1131 is located on one side of the sliding groove 1132. The top of one end of the unlocking action bar 114 is fixed with a limiting protrusion 1141. The bottom of one end of the unlocking action bar 114 is provided with a spring 118. The spring 118 is located below the limiting protrusion 1141 and is fixed to the lock cylinder fixing plate 117. The unlocking action bar 114 can press against the limiting groove 1131 of the linkage plate 113 through the limiting protrusion 1141. The outer part of each group of lock latches 112 is sleeved with an elastic element 111. The unlocking power structure 12 includes a micro motor 121, a rotating handle 122 matched with the unlocking action bar 114 of the passive induction lock cylinder 1 and a motor fixing seat 123. The motor shaft of the micro motor 121 is connected to the rotating handle 122. The micro motor 121 is installed on the upper end of the driving plate 13 and is electrically connected to the motor driving module of the driving plate 13. The micro motor 121 is fixed to the motor fixing seat 123. The micro motor 121 is installed on the upper end of the driving plate 13 through the motor fixing seat 123.

[0043] When the cabinet door 4 is locked, the lock latches 112 connected to the linkage plate 113 of the passive induction lock cylinder 1 are in an extended state. The linkage plate 113 will press the elastic elements 111 on the lock latches 112, so that the elastic elements 111 are in a compressed state. The limiting protrusion 1141 on the unlocking action bar 114 will press against the limiting groove 1131 of the linkage plate 113.

[0044] When the cabinet door 4 is to be unlocked, the micro motor 121 is used to rotate the rotating handle 122. When the rotating handle 122 rotates downward, it will press the unlocking action bar 114, so that the limiting protrusion 1141 on the unlocking action bar 114 no longer presses against the limiting groove 1131 of the linkage plate 113. Under the elastic action of the elastic elements 111 on the lock latches 112, the linkage plate 113 will rebound. The linkage plate 113 is matched with the sliding rail 115 through the sliding block 116, so that the linkage plate 113 and the lock latches 112 will be retracted, that is, the unlocking operation of the passive induction lock cylinder 1 is realized.

[0045] The elastic element 111 is mainly arranged to provide reset elastic force for the lock tongue 112, conveniently extends and retracts the lock tongue 112, and realizes the extension and retraction of the lock tongue 112 in the lock slot 41 through the cooperation of the unlocking action strip 114, the linkage plate 113, the sliding block 116 and the sliding rail 115, thereby realizing the unlocking and locking operation of the passive induction lock cylinder 1.

[0046] As Figures 9-13 As shown in the utility model embodiment, the radio frequency circuit comprises an inductor L4, an inductor L5, a capacitor C10, an inductor L3, a capacitor C12 and a capacitor C13, one end of the inductor L3 is electrically connected with one end of the capacitor C10 and one end of the capacitor C12, the other end of the inductor L3 is electrically connected with the capacitor C13, the other end of the capacitor C10 is electrically connected with one end of the inductor L4, one end of the inductor L4 is also electrically connected with the 32th pin of the main control chip U2, one end of the inductor L5 is electrically connected with the other end of the inductor L4 and the 31th pin of the main control chip U2, the other end of the inductor L5 is electrically connected with the 30th pin of the main control chip U2. The 32th pin and the 31th pin of the main control chip U2 are ANT1 and ANT2 double antennas, the radio frequency circuit is combined with the inductor L3, the inductor L4, the inductor L5, the capacitor C10, the capacitor C12 and the capacitor C13 to form an impedance matching network, the impedance matching network supports ANT1 / ANT2 double antenna switching and enhances the receiving and transmitting capability of the signal of the main control board 31.

[0047] In a specific implementation of this utility model, the wireless power supply receiving module includes a wireless power supply receiving chip U1, an inductor L2, a capacitor C5, a Schottky diode D1, a capacitor C6, a Schottky diode D2, a power inductor L1, a resistor R3, a resistor R5, and a capacitor C7. The wireless power supply receiving chip U1 is a T3168. Pin 2 of the wireless power supply receiving chip U1 is electrically connected to one end of the Schottky diode D1 and one end of the capacitor C6. The two ends of the inductor L2 are electrically connected to the two ends of the capacitor C5 to form an LC oscillation circuit. The two ends of the inductor L2 are also connected to the Schottky diode D1. The other end of diode D1 and the other end of capacitor C6 are electrically connected. Pin 3 of wireless power receiver chip U1 is electrically connected to one end of Schottky diode D2 and one end of power inductor L1. Pin 4 of wireless power receiver chip U1 is electrically connected to the other end of Schottky diode D2. The other end of power inductor L1 is electrically connected to one end of resistor R3. One end of resistor R3 is also electrically connected to one end of resistor R5. The other end of resistor R3 is electrically connected to pin 5 of wireless power receiver chip U1 and one end of capacitor C7. The other end of capacitor C7 is electrically connected to the other end of resistor R5. The wireless power receiving module uses a wireless power receiving chip U1 as the wireless energy receiving chip. Electrical energy is coupled through an inductor L2. In the LC oscillation circuit formed by inductor L2 and capacitor C5, when capacitor C5 charges and discharges, a current is generated, which in turn produces a magnetic field. Because the energy of capacitor C5 and inductor L2 periodically transforms, this LC oscillation circuit can generate periodically changing electric and magnetic fields, i.e., an alternating magnetic field. When the magnetic lock key 3 is close to the induction coil 2, the alternating magnetic field generated by the LC oscillation circuit inside the magnetic lock key 3 is used, based on electromagnetic... Based on the principle of induction, the induction magnetic coil 2 cuts the magnetic field lines to generate alternating current. The wireless power supply receiver chip U1 can also receive the alternating current through inductor L2, and then convert it into DC voltage through Schottky diode D1. In addition, the wireless power supply receiver chip U1 is connected to the voltage regulator circuit module through the output terminal of pin 3. The voltage regulator circuit module stabilizes the output voltage to power the main control chip U2. The Schottky diodes D1 and D2 designed in the wireless power supply receiver module also play a role in preventing reverse connection of the power supply and protecting the downstream circuit components. The capacitance of capacitor C6 is 10μF / 25V. Capacitor C6 can filter out the ripple in the input voltage of the wireless power supply receiver chip U1 and stabilize the input voltage. Capacitor C7 is used as an output filter capacitor, which works with power inductor L1 to suppress high-frequency ripple and provide a stable DC output, providing a reliable power foundation for subsequent circuits.

[0048] In the embodiment of the utility model, this motor drive module includes triode Q2, resistance R4, MOSFET tube Q1, motor connecting seat P1, schottky diode D3, the base of triode Q2 is electrically connected with the 43th pin of main control chip U2, the both ends of resistance R4 are electrically connected with the base of triode Q2 and the G pole of MOSFET tube Q1 respectively, the both ends of schottky diode D3 are electrically connected with the 1st pin and the 2nd pin of motor connecting seat P1 respectively, the D pole of MOSFET tube Q1 is electrically connected with the 1st pin of motor connecting seat P1 and one end of schottky diode D3, and the motor drive module is electrically connected with micro motor 121 of unlocking power structure 12 through motor connecting seat P1. When being specifically realized, the model of triode Q2 is 9014, triode Q2 is NPN type, the model of MOSFET tube Q1 is AO3401A, and the model of schottky diode D3 is SS34, the conduction of triode Q2 is controlled through the 43th pin of main control chip U2, thereby controlling subsequent MOSFET tube Q1 circuit, resistance R4 is connected between triode Q2 and the G pole of MOSFET tube Q1, mainly plays the current-limiting effect, prevents the excessive current from damaging MOSFET tube Q1, the MOSFET tube Q1 mainly is used as switch, the G pole voltage of MOSFET tube Q1 controls the conduction between D pole and S pole, and motor connecting seat P1 is mainly electrically connected with micro motor 121, when MOSFET tube Q1 is conducted, the current flows through micro motor 121, makes it work, schottky diode D3 is electrically connected with the both ends of motor connecting seat P1, and the connected schottky diode D3 mainly plays the effect of preventing reverse voltage and freewheeling diode, when micro motor 121 is powered off, since micro motor 121 is electrically connected with motor connecting seat P1, therefore, the reverse electromotive force in coil will be released, and schottky diode D3 can protect MOSFET tube Q1 from being punctured.

[0049] The utility model discloses a magnet is fixed on the side of each group of lock tongue 112, and the magnet is located on the side of hall sensor module on the driving plate 13, and through the lock tongue 112 in the telescopic process, the relative distance between the magnet and hall sensor module will be changed. When being specifically realized, the hall sensor module includes all pole hall switch P2, resistance R7, resistance R8, capacitor C18, the model of all pole hall switch P2 is HAL253UA, the 3rd pin of all pole hall switch P2 is electrically connected with one end of resistance R8, one end of capacitor C18 and the 11th pin of main control chip U2, and the 2nd pin of all pole hall switch P2 is electrically connected with one end of resistance R7. The hall sensor module detects the state of passive induction lock cylinder 1 through all pole hall switch P2, and judges the closing or opening state of passive induction lock cylinder 1 through the approach or departure of the magnet on the lock tongue 112, for example: when the lock tongue 112 of passive induction lock cylinder 1 is locked in place, the magnetic field change triggers all pole hall switch P2, and the 2nd pin output of all pole hall switch P2 is connected to the 11th pin of main control chip U2, when all pole hall switch P2 detects the magnetic field change, all pole hall switch P2 sends the locking signal to main control chip U2, and makes main control chip U2 control the operation of micro motor 121, the hall sensor module provides current-limiting protection for all pole hall switch P2 through resistance R7, prevents power fluctuation or short-circuit damage all pole hall switch P2, resistance R8 is connected to VCC as pull-up resistance, and the output signal is pulled up to the effective level, capacitor C18 mainly plays the role of de-bouncing filter, eliminates signal jitter, capacitor C18 and resistance R8 constitute RC low pass filter circuit, filter the high-frequency noise in all pole hall switch P2 output signal, and ensure that main control chip U2 receives stable level signal.

[0050] The power supply principle of the passive lock system is as follows:

[0051] When the external magnetic force lock key 3 approaches the induction magnetic coil 2, an alternating magnetic field is generated by using the LC oscillation circuit in the magnetic force lock key 3, and the induction magnetic coil 2 will cut the magnetic induction line to generate alternating current based on the principle of electromagnetic induction. The wireless power supply receiving chip U1 on the main control board 31 in the magnetic force lock key 3 can receive the alternating current generated by the induction magnetic coil 2 as a wireless energy receiving chip, and since the induction magnetic coil 2 is electrically connected with the driving plate 13, the generated alternating current can be used to drive the motor driving module on the driving plate 13.

[0052] The unlocking principle of the passive lock system is as follows:

[0053] When the lock tongue 112 is in the extended locking state, the full-pole Hall switch P2 of the Hall sensing module is in the closed state, and the opening signal can be sent to the magnetic lock key 3 through the terminal device; after the magnetic lock key 3 receives the opening signal through the main control chip U2 on the internal main control board 31, the main control chip U2 sends the opening signal to the driving board 13, controls the triode Q2 in the motor driving module on the driving board 13 to be turned on, makes the MOSFET tube Q1 be turned on, drives the micro motor 121 connected with the motor seat P1 to rotate, and the micro motor 121 rotates and drives the rotating handle 122 to rotate downward, so that the opening action strip 114 is pressed downward, the limiting protrusion 1141 on the opening action strip 114 no longer abuts against the limiting groove 1131 of the linkage plate 113, the linkage plate 113 is rebounded under the elastic action of the elastic element 111 on the lock tongue 112, the linkage plate 113 is matched with the slide rail 115 through the sliding block 116, so that the linkage plate 113 and the lock tongue 112 are retracted, and the opening is realized; when the lock tongue 112 is opened, the full-pole Hall switch P2 of the Hall sensing module changes, sends the signal to the main control chip U2, the main control chip U2 sends the signal to the micro motor 121, so that the rotation is stopped, and the cabinet door 4 can be opened by pulling the handle 42 on the cabinet door 4.

[0054] Compared with the prior art, the technical scheme disclosed in the above embodiment has the following beneficial effects:

[0055] In the above embodiment, the passive lock system of the utility model utilizes the electromagnetic induction interaction between the induction magnetic coil 2 and the magnetic lock key 3 to generate current, the main control board 31 is built-in the magnetic lock key 3, the wireless power supply receiving module is arranged on the main control board 31, the driving board 13 is electrically connected with the induction magnetic coil 2, the wireless power supply receiving module on the main control board 31 in the magnetic lock key 3 is matched with the induction magnetic coil 2, the wireless power supply receiving module can receive the generated alternating current, and the main control board 31 in the magnetic lock key 3 is powered, in addition, since the induction magnetic coil 2 is also electrically connected with the driving board 13 of the passive induction lock cylinder 1, therefore, the generated current can also power the driving board 13 of the passive induction lock cylinder 1, so that the passive lock system does not need to be externally connected with a power supply or built-in a battery, the external cable and the power supply installation process are saved, the installation and maintenance are relatively simple, the safety of the passive lock system is further ensured, the external cable does not affect the appearance of the dangerous chemical product management cabinet 5, the magnetic lock key 3 adopts the Bluetooth communication mode between the main control chip U2 of the main control board 31 and the terminal device, does not need to be operated in a networked mode, avoids the data leakage of the dangerous chemical products stored in the dangerous chemical product management cabinet 5 caused by hacker attacks, and ensures the safety of the dangerous chemical products in the storage and use process. In addition, compared with the traditional electronic fingerprint lock or electronic password lock, the passive lock system has a lower price, because the passive lock system does not need to be externally connected with a power supply and built-in a power supply battery, only needs the installation cost of the passive lock system, and the overall cost of safety management can be reduced.

[0056] The utility model has been described in detail above, the above-mentioned are only the preferred embodiment of the utility model, and cannot limit the utility model implementation range, namely, all equal changes and modifications made according to the scope of the application should still belong to the utility model coverage.

Claims

1. A passive locking system for a hazardous chemical management cabinet, characterized in that: The system includes a passive locking system installed on the door of a hazardous materials management cabinet. The passive locking system includes a passive induction lock cylinder, an induction magnetic coil, and a magnetic lock key located outside the induction magnetic coil and cooperating with the induction magnetic coil. The induction magnetic coil is fixed to the front side of the cabinet door, the passive induction lock cylinder is fixed to the inside side of the cabinet door, the passive induction lock cylinder is located below the induction magnetic coil, and the side of the cabinet door is provided with a lock groove. The magnetic lock key has a built-in main control board, which includes a main control module and a wireless power supply receiving module. The wireless power supply receiving module is electrically connected to the main control module. The main control module includes a main control chip U2 and an radio frequency circuit. The main control chip U2 is model NRF51822, and the main control chip U2 is electrically connected to the radio frequency circuit. The passive induction lock cylinder includes a lock cylinder structure that mates with the cabinet door lock slot, an unlocking power structure, and a drive plate. The unlocking power structure is installed above the drive plate, and the lock cylinder structure is installed on one side of the unlocking power structure and the drive plate. The drive plate is electrically connected to the unlocking power structure and the induction magnetic coil. The drive board includes a motor drive module and a Hall sensor module, both of which are electrically connected to the main control module of the main control board.

2. The passive locking system for hazardous chemical management cabinets according to claim 1, characterized in that: The passive induction lock cylinder includes a lock cylinder fixing plate and two sets of bolts, a linkage plate, an unlocking action bar, a slide rail, and a slider mounted on the upper surface of the lock cylinder fixing plate. The two sets of bolts are symmetrically distributed on the upper surface of the lock cylinder fixing plate. One end of each set of bolts is connected to both sides of the linkage plate, and the other end of each set of bolts can extend and retract within the lock groove. The unlocking action bar and the slide rail are installed between the two sets of bolts. The unlocking action bar is installed on one side of the slide rail. The slider is fixed to the middle of the linkage plate and slides with the slide rail. The linkage plate is provided with a limiting groove and a sliding groove to facilitate the slider to drive the linkage plate to move along the slide rail. The limiting groove is located on one side of the sliding groove. A limiting protrusion is fixed to the top of one end of the unlocking action bar, and a spring is provided at the bottom of one end of the unlocking action bar. The spring is located below the limiting protrusion and fixed to the lock cylinder fixing plate. The unlocking action bar can press against the limiting groove of the linkage plate through the limiting protrusion. Both sets of bolts are covered with elastic elements.

3. The passive locking system for hazardous chemical management cabinets according to claim 2, characterized in that: Each set of latches has a magnet fixed to its side, and the magnet is located on one side of the Hall sensor module on the drive board.

4. The passive locking system for hazardous chemical management cabinets according to claim 1, characterized in that: The unlocking power structure includes a micro motor and a rotating handle that cooperates with the unlocking action bar of the passive induction lock cylinder. The motor shaft of the micro motor is connected to the rotating handle. The micro motor is mounted on the upper end of the drive plate and is electrically connected to the motor drive module of the drive plate.

5. The passive locking system for a hazardous chemical management cabinet according to claim 1, characterized in that: The radio frequency circuit includes inductor L4, inductor L5, capacitor C10, inductor L3, capacitor C12, and capacitor C13. One end of inductor L3 is electrically connected to one end of capacitor C10 and one end of capacitor C12, and the other end of inductor L3 is electrically connected to capacitor C13. The other end of capacitor C10 is electrically connected to one end of inductor L4, and one end of inductor L4 is also electrically connected to pin 32 of the main control chip U2. One end of inductor L5 is electrically connected to the other end of inductor L4 and pin 31 of the main control chip U2, and the other end of inductor L5 is electrically connected to pin 30 of the main control chip U2.

6. The passive locking system for a hazardous chemical management cabinet according to claim 1, characterized in that: The wireless power supply receiver module includes a wireless power supply receiver chip U1, an inductor L2, a Schottky diode D1, capacitors C5 and C6, a Schottky diode D2, a power inductor L1, resistors R3 and R5, and capacitor C7. The wireless power supply receiver chip U1 is a T3168. Pin 2 of the wireless power supply receiver chip U1 is electrically connected to one end of the Schottky diode D1 and one end of the capacitor C6. The two ends of the inductor L2 are electrically connected to the two ends of the capacitor C5 to form an LC oscillation circuit. The two ends of the inductor L2 are also connected to the other end of the Schottky diode D1. One end of the wireless power supply receiver chip U1 is electrically connected to the other end of the capacitor C6. The third pin of the wireless power supply receiver chip U1 is electrically connected to one end of the Schottky diode D2 and one end of the power inductor L1. The fourth pin of the wireless power supply receiver chip U1 is electrically connected to the other end of the Schottky diode D2. The other end of the power inductor L1 is electrically connected to one end of the resistor R3. One end of the resistor R3 is also electrically connected to one end of the resistor R5. The other end of the resistor R3 is electrically connected to the fifth pin of the wireless power supply receiver chip U1 and one end of the capacitor C7. The other end of the capacitor C7 is electrically connected to the other end of the resistor R5.

7. The passive locking system for a hazardous chemical management cabinet according to claim 1, characterized in that: The motor drive module includes a transistor Q2, a resistor R4, a MOSFET Q1, a motor connector P1, and a Schottky diode D3. The base of the transistor Q2 is electrically connected to pin 43 of the main control chip U2 on the main control board. The two ends of the resistor R4 are electrically connected to the base of the transistor Q2 and the gate of the MOSFET Q1, respectively. The two ends of the Schottky diode D3 are electrically connected to pins 1 and 2 of the motor connector P1, respectively. The drain of the MOSFET Q1 is electrically connected to pin 1 of the motor connector P1 and one end of the Schottky diode D3. The motor drive module is electrically connected to the micromotor of the unlocking power structure through the motor connector P1.

8. The passive locking system for a hazardous chemical management cabinet according to claim 1, characterized in that: The Hall sensor module includes an omnipolar Hall switch P2, resistors R7 and R8, and capacitor C18. The omnipolar Hall switch P2 is model HAL253UA. The third pin of the omnipolar Hall switch P2 is electrically connected to one end of resistor R8, one end of capacitor C18, and the 11th pin of the main control chip U2. The second pin of the omnipolar Hall switch P2 is electrically connected to one end of resistor R7.

9. The passive locking system for a hazardous chemical management cabinet according to claim 1, characterized in that: The magnetic lock key includes a magnetic lock housing, and the main control board is built into the magnetic lock housing.

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