CN110656822A - Electronic lock of shopping cart - Google Patents
Electronic lock of shopping cart Download PDFInfo
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- CN110656822A CN110656822A CN201810687039.3A CN201810687039A CN110656822A CN 110656822 A CN110656822 A CN 110656822A CN 201810687039 A CN201810687039 A CN 201810687039A CN 110656822 A CN110656822 A CN 110656822A
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- 230000007246 mechanism Effects 0.000 claims abstract description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 36
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 23
- 229910052744 lithium Inorganic materials 0.000 claims description 23
- 238000003780 insertion Methods 0.000 claims description 20
- 230000037431 insertion Effects 0.000 claims description 20
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- 230000000903 blocking effect Effects 0.000 claims description 12
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- 238000005516 engineering process Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
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Classifications
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B73/00—Devices for locking portable objects against unauthorised removal; Miscellaneous locking devices
- E05B73/0005—Devices for locking portable objects against unauthorised removal; Miscellaneous locking devices using chains, cables or the like
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
- E05B47/02—Movement of the bolt by electromagnetic means; Adaptation of locks, latches, or parts thereof, for movement of the bolt by electromagnetic means
- E05B47/026—Movement of the bolt by electromagnetic means; Adaptation of locks, latches, or parts thereof, for movement of the bolt by electromagnetic means the bolt moving rectilinearly
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
- E05B2047/0048—Circuits, feeding, monitoring
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
- E05B2047/0048—Circuits, feeding, monitoring
- E05B2047/0071—Connecting lockparts by electronic communication means only, e.g. bus systems, time multiplexing
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- Handcart (AREA)
Abstract
The invention discloses an electronic lock of a shopping cart, which comprises a key plug board, an upper shell, a lower connecting seat electromagnetic actuating mechanism, a driving module, a communication module, a locking signal trigger circuit unit and an MCU unit, wherein the lower connecting seat is used for being fixed on a push rod of the shopping cart, the upper shell is fixed on the lower connecting seat, one side surface of the upper shell is provided with a key jack, the key plug board is provided with a clamping hole, the MCU unit is connected with a data input and output end of the communication module, an output end of the locking signal trigger circuit unit and a control end of the driving module, the communication module, the MCU unit, the locking signal trigger circuit unit and the driving module are all fixed in the upper shell, the electromagnetic actuating mechanism is fixed in the upper shell and positioned beside the key jack, when the key jack is inserted into the key plug board and the key plug board locks the signal trigger circuit unit, the moving shaft of the electromagnetic actuating mechanism drives the lock tongue to be inserted into the clamping hole of the key inserting plate, so that the key inserting plate cannot be pulled out.
Description
Technical Field
The invention relates to the technical field of electronic locks, in particular to a control circuit of an electronic lock.
Background
The current shopping cart lock adopts a coin lock, for example, the invention creation patent with the patent application number of 200420059445.9 discloses a coin lock for shopping carts, the invention patent document with the patent application number of 03810668.X discloses a mortgage lock for transport carts, and the invention creation document with the patent application number of 201620005872.1 discloses an integrated coin lock for shopping carts, and as seen from the above documents, the shopping cart lock has the following defects that the structure is a mechanical structure to complete unlocking and locking, and the coin lock has the following structure: 1. the structure is complex, the assembly process is multiple, and the cost is high; 2. when in use, coins need to be mortared, which is not suitable for the current payment mode and brings inconvenience to consumers; 3. due to the adoption of a complex mechanical structure, the coin feeder runs for a long time, and is difficult to avoid abrasion, so that the coin feeding or the closing retreating is difficult; 4. when coins cannot enter, the rear vehicle cannot be used, and when the coin is difficult to retreat, the lock is easily knocked down by violence of a consumer, and the two situations bring management troubles to a manager.
Summary of the invention
The invention aims to provide an electronic lock of a shopping cart, which is used for manufacturing the electronic lock of the shopping cart and solves the technical defects of the existing electronic lock of the shopping cart in the background technology.
In order to achieve the purpose, the invention adopts the following technical means: the utility model provides a shopping cart electronic lock, includes key picture peg, upper housing and lower connecting seat, the connecting seat is used for fixing on the push rod of shopping cart down, upper housing is fixed under on the connecting seat, open a side of upper housing has the key jack, it has the card hole to open on the key picture peg, include:
the electromagnetic actuating mechanism is used for driving the lock tongue to unlock and lock;
the output end of the driving module is connected with an electromagnetic coil of the electromagnetic actuating mechanism;
the communication module is used for establishing a communication channel and transmitting data;
the locking signal trigger circuit unit is used for generating a locking trigger signal when a key is inserted;
the MCU unit is connected with the data input and output end of the communication module, the output end of the locking signal trigger circuit unit and the control end of the driving module, and is used for receiving an unlocking instruction input by the communication module, outputting a control signal to the driving module according to the unlocking instruction to drive the electromagnetic actuating mechanism to unlock, receiving a locking trigger signal output by the locking signal trigger circuit unit, and outputting a control signal to the driving module according to the locking trigger signal to drive the electromagnetic actuating mechanism to lock;
the power supply module respectively provides required voltage for the locking signal trigger circuit unit, the driving module, the communication module and the MCU unit;
communication module, MCU unit, blocking signal trigger circuit unit and drive module all fix in last casing, electromagnetism actuating mechanism fixes in last casing and is located the key jack by, when key jack was inserted the key picture peg and key picture peg triggers blocking signal trigger circuit unit, electromagnetism actuating mechanism's motion shaft drive spring bolt is inserted in the card hole of key picture peg so that the key picture peg can't be extracted.
Further, the blocking signal trigger circuit unit includes first resistance and dabs the switch, the one end of first resistance is connected with power module's output, the other end of first resistance is connected with the one end of dabbing the switch, an IO end of MCU unit, dabbing the other end ground connection of switch, when key picture peg inserted key jack and targets in place, thereby the key picture peg touching dabs the switch and makes to dabble the switch and switch on.
Further, the blocking signal trigger circuit unit includes proximity switch and optoelectronic coupler, proximity switch's power end is connected with power module's output, proximity switch's earthing terminal ground connection, proximity switch's output is connected with optoelectronic coupler's first input, optoelectronic coupler's second input is connected with power module's output after the resistance, optoelectronic coupler's first output is connected with MCU unit's an IO end, optoelectronic coupler's second output ground connection, when the key picture peg inserted the key jack and targets in place, the key picture peg makes proximity switch response action.
Further, the electromagnetic actuating mechanism comprises a shell, an electromagnetic coil, an electromagnet, a spring and an iron block, wherein the electromagnet is fixedly arranged in the shell, the electromagnetic coil is wound on the electromagnet, the iron block is in a stepped column shape, the large head of the iron block is arranged in the shell, the small head of the iron block penetrates through a through hole formed in the shell, the spring is arranged in the shell, two ends of the spring are respectively connected with the electromagnet and the iron block, the spring is in a compression state, and the electromagnetic coil is connected with the output end of the driving module.
Furthermore, the driving module comprises a voltage dividing resistor unit, a switch tube and a fly-wheel diode, the IO end of the MCU unit is connected to the base of the switch tube through the voltage dividing resistor unit, the collector of the switch tube is connected to the anode of the fly-wheel diode and one input end of the electromagnetic actuator, the cathode of the fly-wheel diode and the other input end of the electromagnetic actuator are connected to the output end of the power module, and the emitter of the switch tube is grounded.
Further, the power module comprises a solar panel, a charging chip, a lithium battery boosting circuit unit and two DC-DC voltage reduction circuit units, the power output end of the solar panel is connected with the power end of the charging chip, the output end of the charging chip is connected with the lithium battery and charges the lithium battery, the state feedback end of the charging chip is connected with one IO end of the MCU unit, the input end of the lithium battery booster circuit unit is connected with the lithium battery, the output end of the circuit outputs a 5VDC power supply, the 5VDC power supply is converted into a power supply required by the locking signal trigger circuit unit, the driving module, the communication module and the MCU unit through two DC-DC voltage reduction circuit units, the solar panel is fixed on the top surface of the upper shell, and the charging chip, the lithium battery boosting circuit unit and the two paths of DC-DC voltage reduction circuit units are all located in the upper shell.
Furthermore, one side of the upper shell or the lower connecting seat, which is opposite to the key insertion hole, is fixedly connected with the key insertion plate through a chain, and the length of the chain ensures that the key insertion plate cannot be inserted into the key insertion hole of the electronic lock.
Furthermore, the locking signal trigger circuit unit, the driving module, the communication module and the MCU are arranged on one substrate.
Further, including the pronunciation broadcast unit, the pronunciation broadcast unit is connected with the MCU unit, the pronunciation broadcast unit sets up in the last casing and the loudspeaker in the pronunciation broadcast unit is located the through-hole next door that sets up in last casing one side.
Further, including the display module assembly, the display module assembly is connected with the MCU unit, the display module assembly is installed on the surface of last casing.
Compared with the prior art, the invention has the beneficial effects that: the invention can realize remote control of unlocking the electromagnetic actuating mechanism only by installing the client on the mobile phone, and the key triggers the electromagnetic actuating mechanism to lock without pressing coins, thereby being suitable for the living habits of modern people and bringing convenience to consumers and managers.
Drawings
Fig. 1 is a block diagram of an electric control structure created by the present invention.
Fig. 2 is a schematic circuit diagram of the MCU unit and the latch signal triggering circuit unit in the present invention.
Fig. 3 is another circuit schematic diagram of the latch signal triggering circuit unit in the invention.
Fig. 4 shows a schematic circuit diagram of the GPRS module in the invention.
Fig. 5 is a schematic circuit diagram of the bluetooth module in the invention.
Fig. 6 is a schematic circuit diagram of the power module according to the invention.
Fig. 7 is a schematic circuit diagram of the solar panel charging circuit in the invention.
Fig. 8 is a schematic structural diagram of an electromagnetic actuator in the invention.
Fig. 9 is a schematic circuit diagram of a driving module according to the present invention.
Fig. 10 is a schematic circuit diagram of the voice playback unit in the invention.
Fig. 11 is a schematic view of the overall structure of the electronic lock according to the present invention.
Fig. 12 is a schematic structural view of the upper housing assembly of the electronic lock (without the key board inserted) according to the present invention.
Fig. 13 is a schematic structural view (inserting a key board) of the upper shell assembly of the electronic lock of the invention.
Detailed Description
In order to make the content of the invention clearer, the following detailed description of the embodiments of the invention is made with reference to the accompanying drawings. It should be noted that for the sake of clarity, the figures and the description omit representation and description of parts known to those skilled in the art that are not relevant to the inventive concept.
Referring to fig. 1 and 9-13, an electronic lock for a shopping cart comprises a key board 1, an upper housing 2 and a lower connecting seat 3, wherein the lower connecting seat 3 is used for being fixed on a push rod 4 of the shopping cart, the upper housing 2 is fixed on the lower connecting seat 3, a key insertion hole 2-1 is formed in one side surface of the upper housing 2, a locking hole 1-1 is formed in the key board 1, the connecting mode of the lower connecting seat 3 and the upper housing 2 and the lower connecting seat 3 are the prior art, the connecting mode in the patent documents mentioned in the background can be adopted, the prior art is divided into a clamping mode (refer to 201620005872.1 patent document) and a screw connection mode (refer to 200420059445.9 patent document), and the invention further comprises:
the electromagnetic actuating mechanism 5 is used for driving the bolt 6 to unlock and lock;
the output end of the driving module is connected with the electromagnetic actuating mechanism 5;
the communication module is used for establishing a communication channel and transmitting data;
the locking signal trigger circuit unit is used for generating a locking trigger signal when the key flashboard is inserted into the key jack in place;
the MCU unit is connected with the data input and output end of the communication module, the output end of the locking signal trigger circuit unit and the control end of the driving module, and is used for receiving an unlocking instruction input by the communication module, outputting a control signal to the driving module according to the unlocking instruction to drive the electromagnetic actuating mechanism to unlock, receiving a locking trigger signal output by the locking signal trigger circuit unit, and outputting a control signal to the driving module according to the locking trigger signal to drive the electromagnetic actuating mechanism to lock;
the power supply module respectively provides required voltage for the locking signal trigger circuit unit, the driving module, the communication module and the MCU unit; the locking signal trigger circuit unit, the driving module, the communication module and the MCU unit are arranged on a PCB substrate, and the PCB substrate is fixed in the upper shell through screws. The front end of the key inserting plate 1 is provided with a triggering part for triggering the locking signal triggering circuit unit, and the structural shape of the triggering part can be changed according to actual conditions.
The communication module, the MCU unit, the locking signal trigger circuit unit and the driving module are all fixed in the upper shell 2, the electromagnetic actuating mechanism 5 is fixed in the upper shell 2 and is positioned beside the key insertion hole 2-1, when the key insertion hole 2-1 is inserted into the key insertion plate 1 and the key insertion plate 1 triggers the locking signal trigger circuit unit, the moving shaft of the electromagnetic actuating mechanism 5 drives the lock tongue 6 to be inserted into the clamping hole 1-1 of the key insertion plate 1 so that the key insertion plate 1 cannot be pulled out of the electronic lock.
The remote unlocking device receives a remote unlocking command, the MCU unit controls the electromagnetic actuating mechanism to be powered on and unlocked through the driving module, the locking signal triggering circuit unit is triggered through the key plug board, and the MCU unit controls the electromagnetic actuating mechanism to be powered off and locked through the driving module.
On the basis of the above embodiment, as shown in fig. 2, the MCU unit includes a single chip microcomputer, a crystal oscillator circuit unit, a boot mode configuration circuit unit, an emulator interface, and a serial interface, and the crystal oscillator circuit unit, the boot mode configuration circuit unit, the emulator interface, and the serial interface are connected to corresponding ports of the single chip microcomputer. The MCU unit adopts a single chip microcomputer with the model number of STM32F103C8T6, two output pins of the Boot mode configuration circuit unit are connected with B00T0 and B00T1 pins of the single chip microcomputer, the crystal oscillator circuit unit is connected with a fifth pin and a sixth pin of the single chip microcomputer, the emulator interface is connected with a seventh pin, a thirty-nine pin, a thirty-seven pin and a thirty-four pin of the single chip microcomputer, the serial interface is connected with a thirty-first pin and a thirty-third pin of the single chip microcomputer, the power supply module outputs 3.3VDC power to supply power to the MCU unit, the single chip microcomputer, the crystal oscillator circuit unit, the Boot mode configuration circuit unit, the emulator interface and the serial interface are all in the prior art, and the specific structures of the single chip microcomputer, the crystal oscillator circuit unit, the. When the boot mode configuration circuit unit puts pins B00T0 and B00T1 of the singlechip into 1 and 0, the singlechip downloads programs through a serial interface, and when the boot mode configuration circuit unit puts pins B00T0 and B00T1 of the singlechip into 0 and 0, the singlechip is connected with a simulator through a simulator interface to realize online debugging.
In the invention, two preferable schemes of the locking signal trigger circuit unit are that the first scheme is as follows: as shown in fig. 2, 11-13, the blocking signal trigger circuit unit includes a first resistor R6 and a tact switch 7, one end of the first resistor R6 is connected to the output end of the power module, the other end of the first resistor R6 is connected to one end of the tact switch 7 and one IO end of the MCU unit, and the other end of the tact switch 7 is grounded. The key touches the light touch switch, the output voltage of blocking signal trigger circuit unit is pulled down by the high level, blocking signal trigger circuit unit inputs the low level for the twenty-fifth pin of singlechip, the singlechip adopts low level signal or falling edge signal as trigger signal, the blocking signal trigger circuit unit structure that adopts light touch switch 7 is simpler, and is with low costs, and easy to realize, but need the contact, long-term reliability is general, light touch switch 7 is located the upper shell, the portion in figure 9 is a outstanding point portion, can directly touch blocking signal trigger circuit unit. When the key inserting plate 1 is inserted into the key inserting hole 2-1 to the right position, the triggering part of the key inserting plate touches the tact switch 7 so as to enable the tact switch 7 to be conducted.
The second mode is as follows: as shown in fig. 3, the blocking signal trigger circuit unit includes a proximity switch P1 and a photocoupler U2, a power supply end of the proximity switch P1 is connected to an output end of the power module, a ground end of the proximity switch P1 is grounded, an output end of the proximity switch P1 is connected to a first input end of the photocoupler U2, a second input end of the photocoupler U2 is connected to an output end of the power module after passing through a resistor, a first output end of the photocoupler U2 is connected to an output end of the power module after passing through a resistor, a first output end of the photocoupler is connected to an IO end of the MCU unit, and a second output end of the photocoupler is grounded. When a key is inserted, the output of the proximity switch P1 is pulled down to a low level from a default high level, at the moment, two input ends of a photoelectric coupler U2 are pulled down to a low level from a pressure difference, the output end of the photoelectric coupler U2 is pulled down to a low level from a high level, the level of a fiber pin of the single chip microcomputer is pulled down to a low level from a high level, the single chip microcomputer adopts a low level signal or a falling edge signal as a trigger signal, the structure is non-contact triggering, the implementation is easy, the reliability is good, when the proximity switch is arranged in an upper shell, and the key plug board is inserted into a key jack in place, the proximity switch is enabled to perform a sensing action by the key plug board, and the.
In the invention, as shown in fig. 4, a 5VDC power supply is reduced to a 3.5 to 4.4VDC power supply after passing through an LDO regulator (MIC29302BU), but the specific voltage is determined according to the model of a GPRS chip U3, a GPRS chip U3 adopts a SIM800C chip or a SIM800 chip and the like, the GPRS chip U3 is supplied with the appropriate DC power supply voltage by adjusting resistors R10 and R11, a SIM1 module is a SIM card holder and is connected with the GPRS chip, a PAD1 represents an antenna and is connected to the GPRS chip through an RC pi filter circuit, the RC pi filter circuit can realize impedance matching of the antenna, a TXD end and an RXD end of the GPRS chip are converted by a level conversion circuit and then are connected with a UART end and a singlechip 2_ TX end and a singlechip 634 _ RX end of the triode 6324 shown in fig. 4, and a level conversion circuit 3Q 2, q1\ Q4 and a plurality of resistors, wherein the level switching circuit is a conventional technology, the circuit diagram is not limited to the circuit diagram provided by the invention and the invention creates the circuit diagram shown in the figure 3, the GPRS _ RESET end and the GPRS _ SWITCH ON end of the singlechip pull down the RESET end and the PWRKEY end of the GPRS chip through a triode SWITCH circuit (composed of triodes Q8 and Q7), thereby realizing the mode that the singlechip controls the working modes of the GPRS module, such as initialization, dormancy, working and the like. Fig. 5 shows a schematic structural diagram of a bluetooth module, the bluetooth module uses a cc2540 bluetooth chip, peripheral circuits connected to the cc2540 bluetooth chip are all in the prior art, and not described in detail again, two io terminals of the bluetooth chip are connected to a UART3_ TX terminal and a UART3_ RX terminal of a single chip, a RESET terminal of the bluetooth chip is connected to a lanrelet terminal of the single chip, a power module provides a 3.3VDC power to the bluetooth module, and the single chip can RESET and initialize the bluetooth module. Although the circuit diagrams of the GPRS module and the bluetooth module are given in the creation of the invention, the circuit diagram structures of the GPRS module and the bluetooth module are not limited to the creation of the invention, and have a relationship with a specifically selected chip, and the wifi module has a plurality of types, which are not described herein. The wireless communication module is used in the shopping cart electronic lock.
As shown in fig. 8, the electromagnetic actuator comprises a shell 5-1, an electromagnetic coil 5-2, an electromagnet 5-3, a spring 5-4 and an iron block 5-5-5, the electromagnet 5-3 is fixedly arranged in the shell 5-1, the electromagnetic coil 5-2 is wound on the electromagnet 5-3, the iron block 5-5 is in a stepped column shape, the big end part of the iron block 5-5 is arranged in the shell 5-1, the small head of the iron block 5-5 passes through a through hole arranged on the shell 5-1, the spring 4 is arranged in the shell 5-1, and the two ends of the spring are respectively connected with the electromagnet 5-3 and the iron block 5-5, the spring 4 is in a compressed state, and the electromagnetic coil 5-2 is connected with the output end of the driving circuit. Under the condition of not electrifying, the spring 5-4 is in a compressed state, and a lock tongue connected with an iron block is clamped in a clamping hole on the key inserting plate, so that the consumption of electric energy can be reduced; the electromagnetic coil is electrified, the electromagnet generates a magnetic field, attracts the iron block, overcomes the resistance of the spring, and accordingly the iron block drives the lock tongue to be pulled out of the clamping hole in the key plug board to complete unlocking.
In order to drive the electromagnetic actuator, as shown in fig. 9, the driving module in the invention is a voltage dividing resistor unit, a switching tube and a freewheeling diode D2, an IO end of the MCU unit is connected to a base of the switching tube through the voltage dividing resistor unit, a collector of the transistor Q9 is connected to an anode of the freewheeling diode D and an input end of the electromagnetic actuator, a cathode of the freewheeling diode D and another input end of the electromagnetic actuator are simultaneously connected to an output end of the power module, and a radio-frequency electrode of the switching tube is grounded. The IO end output high level voltage of MCU unit is inputed to triode Q9's base after partial pressure through divider resistance unit (R38 and R39), triode Q9 switches on, then solenoid circular telegram, when the voltage of the IO end of MCU unit becomes low level, the triode cuts off, solenoid cuts off the power supply, because solenoid has the electric energy, carry out the afterflow through freewheel diode D, progressively lose the electricity, if there is no freewheel diode, the electric energy in the solenoid is very big in the twinkling of an eye during the outage, can produce the impact to triode and power module, destroy components and parts.
On the basis of the technical scheme, under the scene of being applied to the shopping cart electronic lock, the power module can be directly powered by the lithium battery and is converted into the power needed by each module through the DC-DC conversion circuit, but lithium battery charging is a problem and is inconvenient for long-term management, therefore, as shown in fig. 6 and 7, the power module comprises a solar panel 8, a charging chip, a lithium battery boosting circuit unit and two DC-DC voltage reduction circuit units, the power output end of the solar panel is connected with the power end of the charging chip, the output end of the charging chip is connected with the lithium battery and is charged, the state feedback end of the charging chip is connected with one IO end of the MCU unit, the input end of the lithium battery boosting circuit unit is connected with the lithium battery, the output end of the lithium battery boosting circuit unit outputs 5VDC power, and the 5VDC power is converted into the locking signal trigger circuit, The drive module, the required power of communication module and MCU unit, the chip that charges adopts QX4054 chip that charges, its first pin is connected to the io end of singlechip, feed back the charge state to the singlechip, lithium cell booster circuit unit adopts ME2109FM5G booster chip control SC 8205's MOS pipe, and the feedback circuit who comprises resistance R36 and resistance R37 feeds back output voltage to ME2109FM5G booster chip, thereby guarantee SC 8205's MOS pipe output stable 5VDC power, and convert 3.3VDC power into by LDO step-down chip AMS 1117. Solar panel gives the 5V power of charging chip power supply, and charging chip charges for the lithium cell, and the lithium cell is 3.7V probably, through solar energy power supply, does not need often to change the battery, is convenient for maintain, solar panel 8 is fixed on the top surface of last casing, and is fixed through pasting the mode, charging chip, lithium cell boost circuit unit and two way DC-DC buck circuit unit all set up on the base plate, and solar panel 8 passes through the wire and the interface is connected with charging chip electricity.
On the basis of the technical scheme, further, the voice playing device comprises a voice playing unit, wherein the voice playing unit is connected with an MCU unit, referring to fig. 10 and 12, the voice playing unit is powered by 3.3VDC, the voice playing unit is arranged in the upper shell 2, a loudspeaker 9 in the voice playing unit is positioned beside a through hole 2-2 arranged on one side of the upper shell 2, and the through hole 2-2 plays three roles: 1. broadcasting is not blocked; 2. ventilating and radiating; 3. radio frequency signals conveniently enter the upper shell, and the strength of the radio frequency signals is guaranteed. The MCU unit controls the voice playing unit to play voice, and the voice content is controlled by the MCU unit.
On the basis of the above technical scheme, further, including the display module assembly, the display module assembly is connected with the MCU unit, the display module assembly is installed on the surface of upper housing 2 (the attached drawing does not show the display module assembly). The display module adopts the liquid crystal module of which the model is LS013B7DH01 and is powered by a 5VDC power supply, and the MCU unit controls the liquid crystal module to display.
In the invention, one side of the upper shell 2 or the lower connecting seat 3, which is opposite to the key insertion hole, is fixedly connected with the key insertion plate 1 through a chain 10, the length of the chain 10 ensures that the key insertion plate 1 cannot be inserted into the key insertion hole 2-1 of the electronic lock, and the chain 10 is connected to the key insertion plate 1 and the electronic lock in a welding or clamping manner.
A control method of an electronic lock of a shopping cart comprises the following steps:
1) the communication module is successfully connected with the server;
2) the MCU unit receives a remote unlocking command through a data transceiving end connected with the communication module;
3) the MCU unit executes an unlocking command, namely outputs a high-level control signal to the driving module, the driving module powers on an electromagnetic coil in the electromagnetic actuating mechanism, the electromagnetic actuating mechanism drives the lock tongue to unlock, unlocking is completed, and the MCU unit sends the current locking state to the server through the communication module;
4) when the key inserting plate is inserted, the key inserting plate triggers the locking signal triggering circuit unit, and the locking signal triggering circuit unit outputs a switching value triggering signal to the MCU unit;
5) the MCU unit receives and identifies the switching value trigger signal, responds to and outputs a low level control signal to the driving module, the driving module cuts off the power of an electromagnetic coil in the electromagnetic actuating mechanism, the electromagnetic actuating mechanism drives the lock tongue to be locked, locking is completed, and the MCU unit sends the current locking state to the server through the communication module.
The MCU unit judges the current state of the lock according to the level of the IO end connected with the driving module, the high level represents the unlocking state, and the low level represents the locking state.
Further, in step 1), when the communication module adopts a GPRS module and a Bluetooth module at the same time, the MCU unit determines whether the connection between the Bluetooth module and the GPRS module and the server is successful, and if the connection between the Bluetooth module and the GPRS module is successful, the MCU unit controls the GPRS module to sleep and stand by, and executes step 2); if any one of the Bluetooth module and the GPRS module is successfully connected, the MCU unit executes the step 2). This step can reduce power consumption and achieve energy conservation.
Further, the switching value trigger signal in step 2) is a low level signal or a falling edge signal. By the method, the server can realize unlocking of the remote control electronic lock, but cannot control locking, the MCU unit is triggered by the key plug board to control locking, the MCU unit feeds back a charging state signal of the charging chip to the server through the communication module, and the server monitors the operation condition of the charging circuit.
When the shopping cart electronic lock is used, a row of shopping carts are arranged in a row, the key inserting plate of the electronic lock of the shopping cart in front is inserted into the key inserting hole of the electronic lock of the shopping cart in back, and the key inserting plate cannot be inserted into the key inserting hole of the electronic lock of the shopping cart, so that the shopping cart electronic lock enables the shopping carts in the row to be connected, and the shopping carts are managed.
Finally, it should be noted that: the above-mentioned embodiments are intended to illustrate rather than limit the invention, and a person skilled in the art may still make modifications to the solutions described in the examples, and any modifications and changes made to the invention shall be considered as the scope of the invention.
Claims (10)
1. The utility model provides a shopping cart electronic lock, includes key picture peg, upper housing and lower connecting seat, the connecting seat is used for fixing on the push rod of shopping cart down, upper housing is fixed under on the connecting seat, open a side of upper housing has the key jack, it has the card hole to open on the key picture peg, its characterized in that includes:
the electromagnetic actuating mechanism is used for driving the lock tongue to unlock and lock;
the output end of the driving module is connected with an electromagnetic coil of the electromagnetic actuating mechanism;
the communication module is used for establishing a communication channel and transmitting data;
the locking signal trigger circuit unit is used for generating a locking trigger signal when a key is inserted;
the MCU unit is connected with the data input and output end of the communication module, the output end of the locking signal trigger circuit unit and the control end of the driving module, and is used for receiving an unlocking instruction input by the communication module, outputting a control signal to the driving module according to the unlocking instruction to drive the electromagnetic actuating mechanism to unlock, receiving a locking trigger signal output by the locking signal trigger circuit unit, and outputting a control signal to the driving module according to the locking trigger signal to drive the electromagnetic actuating mechanism to lock;
the power supply module respectively provides required voltage for the locking signal trigger circuit unit, the driving module, the communication module and the MCU unit;
communication module, MCU unit, blocking signal trigger circuit unit and drive module all fix in last casing, electromagnetism actuating mechanism fixes in last casing and is located the key jack by, when key jack was inserted the key picture peg and key picture peg triggers blocking signal trigger circuit unit, electromagnetism actuating mechanism's motion shaft drive spring bolt is inserted in the card hole of key picture peg so that the key picture peg can't be extracted.
2. The shopping cart electronic lock of claim 1, wherein the locking signal triggering circuit unit comprises a first resistor and a tact switch, one end of the first resistor is connected with the output end of the power module, the other end of the first resistor is connected with one end of the tact switch and one IO end of the MCU unit, the other end of the tact switch is grounded, and when the key plug board is inserted into the key jack in place, the key plug board touches the tact switch so that the tact switch is turned on.
3. The shopping cart electronic lock of claim 1, wherein the locking signal trigger circuit unit includes a proximity switch and a photoelectric coupler, a power end of the proximity switch is connected to an output end of the power module, a ground end of the proximity switch is grounded, an output end of the proximity switch is connected to a first input end of the photoelectric coupler, a second input end of the photoelectric coupler is connected to an output end of the power module after passing through a resistor, a first output end of the photoelectric coupler is connected to an output end of the power module after passing through the resistor, a first output end of the photoelectric coupler is connected to an IO end of the MCU unit, a second output end of the photoelectric coupler is grounded, and when the key plug board is inserted into the key plug hole in place, the key plug board enables the proximity switch to perform an inductive action.
4. The shopping cart electronic lock as claimed in claim 1, wherein the electromagnetic actuator includes a housing, an electromagnetic coil, an electromagnet, a spring and an iron block, the electromagnet is fixedly disposed in the housing, the electromagnetic coil is wound on the electromagnet, the iron block is in a stepped column shape, a large end of the iron block is disposed in the housing, a small end of the iron block passes through a through hole disposed on the housing, the spring is disposed in the housing and has two ends respectively connected to the electromagnet and the iron block, the spring is in a compressed state, and the electromagnetic coil is connected to an output end of the driving module.
5. The shopping cart electronic lock of claim 1, wherein the driving module includes a voltage-dividing resistor unit, a switching tube and a freewheeling diode, the IO terminal of the MCU unit is connected to the base of the switching tube through the voltage-dividing resistor unit, the collector of the switching tube is connected to the anode of the freewheeling diode and one input terminal of the electromagnetic actuator, the cathode of the freewheeling diode and the other input terminal of the electromagnetic actuator are simultaneously connected to the output terminal of the power module, and the emitter of the switching tube is grounded.
6. The shopping cart electronic lock of claim 1, wherein the power module includes a solar panel, a charging chip, a lithium battery voltage boost circuit unit and a two-way DC-DC voltage step-down circuit unit, the power output end of the solar panel is connected with the power end of the charging chip, the output end of the charging chip is connected with the lithium battery and charges the lithium battery, the state feedback end of the charging chip is connected with one IO end of the MCU unit, the input end of the lithium battery booster circuit unit is connected with the lithium battery, the output end of the circuit outputs a 5VDC power supply, the 5VDC power supply is converted into a power supply required by the locking signal trigger circuit unit, the driving module, the communication module and the MCU unit through two DC-DC voltage reduction circuit units, the solar panel is fixed on the top surface of the upper shell, and the charging chip, the lithium battery boosting circuit unit and the two paths of DC-DC voltage reduction circuit units are all located in the upper shell.
7. The shopping cart electronic lock as claimed in claim 1, wherein one side of the upper housing or the lower connecting base opposite to the key insertion hole is fixedly connected to the key insertion plate by a chain, and the length of the chain is ensured so that the key insertion plate cannot be inserted into the key insertion hole of the electronic lock.
8. The shopping cart electronic lock of any one of claims 1-7, wherein the locking signal trigger circuit unit, the driving module, the communication module and the MCU unit are disposed on a substrate.
9. The shopping cart electronic lock of any one of claims 1-7, comprising a voice playing unit, wherein the voice playing unit is connected to the MCU unit, the voice playing unit is disposed in the upper housing, and a speaker in the voice playing unit is disposed beside a through hole disposed at one side of the upper housing.
10. The shopping cart electronic lock of any one of claims 1-7, comprising a display module, the display module being connected to the MCU unit, the display module being mounted on an outer surface of the upper housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810687039.3A CN110656822A (en) | 2018-06-28 | 2018-06-28 | Electronic lock of shopping cart |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810687039.3A CN110656822A (en) | 2018-06-28 | 2018-06-28 | Electronic lock of shopping cart |
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| Publication Number | Publication Date |
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| CN110656822A true CN110656822A (en) | 2020-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810687039.3A Pending CN110656822A (en) | 2018-06-28 | 2018-06-28 | Electronic lock of shopping cart |
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| CN (1) | CN110656822A (en) |
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