CN111204628A - Intelligent elevator safety key input device and method for preventing and controlling virus infection - Google Patents
Intelligent elevator safety key input device and method for preventing and controlling virus infection Download PDFInfo
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- CN111204628A CN111204628A CN202010125733.3A CN202010125733A CN111204628A CN 111204628 A CN111204628 A CN 111204628A CN 202010125733 A CN202010125733 A CN 202010125733A CN 111204628 A CN111204628 A CN 111204628A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
- B66B1/46—Adaptations of switches or switchgear
- B66B1/461—Adaptations of switches or switchgear characterised by their shape or profile
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B1/00—Control systems of elevators in general
- B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
- B66B1/3407—Setting or modification of parameters of the control system
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
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Abstract
An intelligent elevator safety key input device for preventing and controlling virus infection and a method thereof, comprises an elevator safety key, wherein a control circuit is arranged in the elevator safety key, the control circuit is composed of a microcontroller and a peripheral sub circuit, a light intensity detection circuit is arranged in the elevator safety key, the light intensity detection circuit memorizes the current environmental light intensity under the control of the microcontroller and converts the current environmental light intensity into a voltage signal to be stored in a memory capacitor, a reflection type photoelectric sensor receiver is used for converting the total light intensity reflected into the interior of the safety key into the voltage signal, the voltage signal is input into a voltage comparator after passing through a same-phase buffer and then is transmitted to the microcontroller after being compared with the memory voltage, after the microcontroller detects the key used by a user, the output signal controls a safety key driving circuit, and after being driven by a photoelectric coupler and a triode Q4, the normally open relay, the invention can effectively prevent the virus from spreading through the car type elevator key.
Description
Technical Field
The invention relates to the technical field of elevators, in particular to an intelligent elevator safety key input device and method for preventing and controlling virus infection.
Background
The lift-cabin type elevator which is seen everywhere in life is generally totally enclosed, and although a few of the lift-cabin type elevators are provided with air exhausting and ventilating devices, the air circulation in the lift-cabin type elevator is still poor. Since 2019 in winter, a novel coronavirus begins to spread, and the spreading secrecy is one of the main reasons for the rapid spread of the coronavirus, particularly the coronavirus is spread through a common elevator key.
Some car type elevators of high-rise buildings are easy to retain viruses for a long time because the car is almost closed, and particularly, the elevator keys frequently contacted by users are easy to be attached with the viruses. However, the elevator is an important living facility, and is indispensable, and a user needs to press the button of the corresponding floor and the button for opening and closing the door to use the elevator, which provides convenience for the spread of viruses.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the intelligent elevator safety key input device and the method thereof for preventing and controlling the virus infection, so that a user can start the function of a corresponding key by only approaching the elevator key without contacting the elevator key, the virus can be effectively prevented from being spread through a car type elevator key, and the intelligent elevator safety key input device has the characteristics of simple structure and good implementation effect, and plays an important role in preventing epidemic situation from spreading.
In order to achieve the purpose, the invention adopts the technical scheme that:
an intelligent elevator safety key input device for preventing and controlling virus infection comprises an elevator safety key 9, wherein a control circuit is arranged inside the elevator safety key 9, the control circuit is composed of a microcontroller 1 and a peripheral sub-circuit, the peripheral sub-circuit comprises a reflection type photoelectric sensor receiver 2, a reflection type photoelectric sensor emitter 6, a triode Q, an in-phase buffer 3, a voltage comparator 4, a photoelectric coupler 7, a diode D, a relay 8, a safety key 9, an LED display device 10 and a necessary resistance capacitor, a light intensity detection circuit is arranged inside the elevator safety key 9, the light intensity detection circuit memorizes the current ambient light intensity and converts the current ambient light intensity into a voltage signal under the control of the microcontroller 1 and stores the voltage signal in a memory capacitor 5, and the reflection type photoelectric sensor receiver 2 is used for converting the total light intensity reflected into the interior of the safety key 9 into the voltage signal, when a user uses a key (places a hand right in front of the key), the reflection type photoelectric sensor receiver 2 converts total light intensity (current environment light intensity + reflected light intensity) reflected into the inside of the safety key 9 into a voltage signal, the voltage signal is input into the voltage comparator 4 after passing through the in-phase buffer 3, the signal is transmitted to the microcontroller 1 after being compared with the memory voltage, after the microcontroller 1 detects the key to be used by the user, the output signal controls the safety key driving circuit, after the key is driven by the photoelectric coupler 7 and the triode Q4, the normally open contact of the control relay 8 is closed, and the automatic pressing of the elevator safety key 9 is realized.
The micro controller 1 is directly connected with the reflective photoelectric sensor receiver 2, the reflective photoelectric sensor emitter 6, the voltage comparator 4, the photoelectric coupler 7 and the LED display device 10, the micro controller 1 is a low-power-consumption embedded micro controller LPC2103, the reflective photoelectric sensor emitter 6 is controlled by the micro controller 1, the voltage comparator 4 compares electric signals corresponding to light intensity changes and outputs the electric signals to the micro controller 1, the micro controller 1 processes the signals and then outputs low-level control safety key driving circuits to the photoelectric coupler 7, and the LED display device 10 is used for assisting an administrator in elevator parameter setting.
Four triodes Q are arranged in each safety key control circuit, the four triodes Q1, Q2, Q3 and Q4 are controlled by the microcontroller 1 and control other devices, Q1, Q2 and Q3 are arranged in the light intensity detection circuit, Q1 is used for controlling the work of the emitter 6 of the reflection type photoelectric sensor, Q2 is used for controlling the charging of the memory capacitor 5 and memorizing the light intensity of the environment, Q3 is used for controlling the work of the voltage comparator 4, and Q4 is arranged in the safety key drive circuit and amplifies the current output by the photoelectric coupler 7 and then drives the relay 8 to work. Diode D functions as an overcurrent protection transistor Q4.
The reflective photoelectric sensor receiver 2 and the reflective photoelectric sensor emitter 6 are arranged in a light intensity detection circuit, and the power supply of the reflective photoelectric sensor emitter 6 is controlled by a triode Q1 controlled by the microcontroller 1. When the microcontroller 1 outputs a low level, the reflective photoelectric sensor emitter 6 does not work, the electric signal output by the reflective photoelectric sensor receiver 2 only represents the ambient light intensity and is stored in the memory capacitor 5, after the microcontroller 1 outputs a high level control signal, the power supply of the reflective photoelectric sensor emitter 6 is switched on to emit infrared light, the infrared light is reflected by a hand right in front of the safety key 9 and then is received by the reflective photoelectric sensor receiver 2, and the electric signal corresponding to the total light intensity (the ambient light intensity and the reflected light intensity) is output to the in-phase buffer 3.
The in-phase buffer 3 is formed by connecting operational amplifiers, and the input of the in-phase buffer is connected with the output end of the receiver 2 of the reflection type photoelectric sensor.
The power supply of the voltage comparator 4 is controlled by a triode Q3 controlled by the microcontroller 1, the in-phase input end of the voltage comparator is connected with the in-phase buffer 3 during working, the voltage corresponding to the total light intensity (the ambient light intensity + the reflected light intensity) is input, the reverse-phase input end of the voltage comparator is connected with the memory capacitor 5, the voltage corresponding to the ambient light intensity is input, and the two are compared to output signals to the microcontroller 1 for processing.
The memory capacitor 5 is used for memorizing the voltage quantity corresponding to the current environmental light intensity output by the front-stage circuit before the safety key is used and is used as a reference voltage, after the safety key is fully charged, the triode Q2 is controlled to be cut off by the microcontroller 1, the memory capacitor 5 outputs the environmental reference voltage to the inverting input end of the voltage comparator 4, the voltage quantity corresponding to the total light intensity (the environmental light intensity and the reflected light intensity) of the non-inverting input end is compared and then is output to the microcontroller 1, and the automatic detection function of the safety key 9 is realized.
And the coil of the relay 8 is connected with the triode Q4 and is driven by the amplified current, the normally open contact of the relay 8 is closed, and the corresponding key 9 is automatically pressed.
The safety key 9 is made of transparent hard glass materials, and the two ends of the safety key 9 are connected with anti-shake capacitors in parallel.
An intelligent elevator safety key input method for preventing and controlling virus infection comprises the following steps;
the user only needs to place the hand right in front of the safety key 9 without touching, and the microcontroller 1 controls the corresponding key 9 to be automatically pressed down after the short time delay T2; if the user wants to go to a negative floor (such as a second floor), hands are sequentially placed right in front of the safety keys of the '2' and the '2', and the safety key 9 is automatically closed after the short time delay T2; if the user wants to input two-digit floors such as 12 floors, the user puts hands in front of the keys 1 and 2 in sequence in the same way, the microcontroller 1 delays T2 for a short time to ensure that the user finishes inputting, and then the relay 8 is controlled to automatically press the corresponding safety key 9 to start the elevator;
when a user wants to go up and down the floor outside the car, the microcontroller 1 controls the corresponding key 9 to be automatically pressed only by approaching the hand to the △ or ▽ keys;
the acquisition of the environmental light intensity and the comparison of the voltage quantity corresponding to the light intensity reflected by the key 9 are controlled by the control signal output by the microcontroller 1, the microcontroller 1 firstly sends a low level control signal and lasts for a time T1, at the moment, the emitter 6 of the reflective photoelectric sensor does not work, the receiver 2 of the reflective photoelectric sensor only receives the environmental light intensity, outputs a corresponding electric signal and stores the corresponding electric signal in the memory capacitor 5 as the reference voltage of the environmental light intensity;
the short time delay T1 of the microcontroller 1 can ensure that the environmental light intensity is fully collected, the voltage of the memory capacitor 5 is stable, then a high level is output and the short time delay T2 is output, the emitter 6 of the reflective photoelectric sensor emits infrared light, after the infrared light is reflected by a hand right in front of the safety key 9, the enhanced light (consisting of the environmental light intensity and the reflected light intensity) is received by the reflective photoelectric sensor receiver 2 and output as a corresponding voltage quantity, the infrared light passes through the in-phase buffer 3 and is input to the in-phase input end of the voltage comparator 4, the memory capacitor 5 inputs the previously collected environmental reference voltage to the reverse phase input end of the voltage comparator 4, and the voltage comparator 4 outputs a low level signal to the microcontroller 1;
after receiving the first low level signal sent by the voltage comparator 4, the microcontroller 1 judges whether the user still contacts other digital keys through time delay T2, so as to determine whether the user wants to go to a floor with one digit or a floor with two digits, and after the time delay of T2 is finished, if the user goes to the floor with one digit, the relay 8 is driven to automatically press the safety key 9; if the user goes to two floors, the relay 8 automatically presses the corresponding two keys, and then the function of the high-rise elevator is realized by the least safety keys.
The microcontroller 1 is connected with the LED display device 10 and is mainly used for an administrator operating system, the administrator approaches an 'F' key 2s in a safety key 9 by hand, the LED display device 10 can prompt password authentication, and after the password authentication is correct, an elevator parameter setting mode is entered, parameter setting of 'ambient light intensity acquisition time T1', 'key signal temporary storage time T2', 'floor upper limit' and 'floor lower limit' is sequentially carried out, and the device can be automatically stored after the setting is finished. If an error occurs, the administrator puts the hands right in front of the F key again for 2s to reset and clear, namely, the parameters are set again, and the specific numerical values are determined according to the actual conditions of installation environments in different regions;
wherein, the "ambient light intensity acquisition time T1" ensures that the memory capacitor 5 can be fully charged to a voltage stable state, the voltage thereof can accurately represent the current ambient light intensity, T1 generally does not exceed 1ms, and the "key signal temporary storage time T2" is mainly used for the situation that the user wants to go to a two-digit floor or a ground floor: when the microcontroller 1 detects the first key input by the user, the response is not immediate, but a short T2 delay is generated, so that the user can input a second digit in sufficient time, in general, 2s is set at T2, the 'upper floor limit' and the 'lower floor limit' form an effective key range, the effective amount is determined according to the actual floor number of the building, the input exceeding the range is invalid, and the key driving circuit cannot be started.
After the elevator is initialized, the manager can reset the elevator parameters (including the environmental light intensity acquisition time T1, the key signal temporary storage time T2, the upper floor limit and the lower floor limit) through password authentication, or can continue to use the last set value, then the microcontroller 1 sends out a control signal, firstly outputs low level control lasting for T1 time to make the emitter 6 of the reflection type photoelectric sensor not work, the receiver 2 only receives the environmental light intensity and converts the environmental light intensity into a voltage quantity to be stored in the memory capacitor 5, if no user uses the elevator, the change of the environmental light intensity in the elevator car is continuously updated and memorized, if the user uses the elevator key, the microcontroller 1 sends a high level control signal to enable the emitter 6 of the reflection type photoelectric sensor to work, and the receiver 2 receives the ambient light intensity and the reflected light intensity at the moment, converts the ambient light intensity and the reflected light intensity into corresponding voltage and sends the voltage into the voltage comparator 4. The voltage comparator 4 outputs a signal to the microcontroller 1 after comparison, the microcontroller 1 temporarily stores the signal, waits for whether other safety keys are used within the time of T2 (if the user wants to go to 12 layers, the digital '1' is detected, and the digital '2' is detected again within the time of T2), then the microcontroller 1 sends a signal corresponding to the safety key 9 to be used by the user to the corresponding photoelectric coupler 7, the output is amplified by the triode Q4 and then drives the relay 8, and the function that the safety key 9 can be automatically pressed without contact is realized.
The invention has the beneficial effects that:
1. when the safety button is used by a user, the user does not need to touch the button by hand, and only needs to approach the corresponding button, the safety button can be automatically pressed down, and the function of the corresponding button is realized.
2. The number of the keys is small, the function of a high-rise elevator can be still realized through simple combination, and the intelligent elevator is more intelligent.
3. The non-contact keys can prevent viruses from spreading through the elevator keys.
4. The applicability is strong, and the elevator can be additionally installed in the existing elevator and can also be used in the design of a new elevator.
Drawings
FIG. 1 is a schematic diagram of the hardware system of the invention.
Fig. 2 is a schematic view of a security key panel.
Fig. 3 is a flow chart of the invention.
Fig. 4 is a general diagram of the internal control circuit of the safety key.
Fig. 5 is a partially enlarged schematic view of a safety key control circuit in an elevator car.
Fig. 6 is a partially enlarged schematic view of an elevator car external safety key control circuit.
Fig. 7 is an enlarged schematic view of the light intensity detection control circuit of the digital "0" safety key.
Fig. 8 is an enlarged schematic diagram of a digital "0" security key driving control circuit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the hardware system of the present invention includes a microcontroller 1, a reflective photoelectric sensor receiver 2, a reflective photoelectric sensor transmitter 6, a transistor Q, an in-phase buffer 3, a voltage comparator 4, a photoelectric coupler 7, a diode D, a relay 8, a safety button 9, an LED display device 10, and necessary resistance capacitors. The core part microcontroller 1 is a low-power consumption embedded microcontroller LPC2103, has stable control performance, smaller package and extremely low power consumption, and meets the requirements of energy conservation and environmental protection.
The safety key 9 is made of a light-transmitting hard glass material, so that infrared light emitted by the emitter 6 of the reflection type photoelectric sensor in the internal circuit can be fully transmitted, is received by the receiver 2 after being reflected by a hand before encountering the key 9, is converted into a corresponding electric signal, and is fed back to the microcontroller 1 after being processed by the voltage comparator 4. The device automatically collects the ambient light intensity and converts the ambient light intensity into reference voltage to be stored in the memory capacitor 5, when a user uses the safety key 9, the user only needs to approach the safety key without touching the safety key, the corresponding key can be automatically detected and controlled by the microcontroller 1, the safety key driving circuit is started, the coil of the relay 8 is electrified to act, the normally open contact is closed, the corresponding key 9 of the elevator is automatically pressed down, the non-contact safety key function is realized, and viruses are prevented from being attached to the elevator key to be transmitted.
Referring to fig. 2, numbers of 0-9, minus sign and door-opening sign are marked below the safety keys in the elevator car
Door closing symbol
And the symbol "F" of the key set by the manager, and the symbol "△" for going upstairs and the symbol for going downstairs are arranged on each floor outside the elevator car doorNumber ▽. each key contains the internal hardware system of fig. 1, implementing the function of a contactless, i.e. automatic, key.
According to the use method of the intelligent elevator safety key for preventing and controlling virus infection, a user only needs to place a hand right in front of the safety key 9 without contacting, and the microcontroller 1 can control the corresponding key 9 to be automatically pressed down after a short time delay of T2; if the user wants to go to a negative floor (such as a second floor), hands are sequentially placed right in front of the safety keys of the '2' and the '2', and the safety key 9 is automatically closed after the short time delay T2; if the user wants to input two-digit floors such as 12 floors, the user puts hands in front of the keys 1 and 2 in sequence in the same way, the microcontroller 1 delays the time T2 for a short time to ensure that the user finishes inputting, and then the relay 8 is controlled to automatically press the corresponding safety key 9 to start the elevator.
Referring to fig. 3, the working flow of the present invention is as follows: after the elevator is initialized, the administrator can reset the elevator parameters (including "ambient light intensity acquisition time T1", "key signal temporary storage time T2", "upper floor limit" and "lower floor limit") by password authentication, or can continue to use the previous set values. Then the microcontroller 1 sends out a control signal, firstly outputs low level control lasting for T1 time to make the emitter 6 of the reflective photoelectric sensor not work, the receiver 2 only receives the ambient light intensity and converts the ambient light intensity into a voltage quantity to be stored in the memory capacitor 5, if no user uses the elevator, the change of the ambient light intensity in the elevator car is continuously updated and memorized, if the user uses the elevator key, the microcontroller 1 sends out a high level control signal to make the emitter 6 of the reflective photoelectric sensor work, at the moment, the receiver 2 receives the ambient light intensity and the reflected light intensity, converts the ambient light intensity into a corresponding voltage quantity and sends the voltage quantity to the voltage comparator 4. The voltage comparator 4 outputs a signal to the microcontroller 1 after comparison, the microcontroller 1 temporarily stores the signal, waits for whether other safety keys are used within the time of T2 (if the user wants to go to 12 layers, the digital '1' is detected, and the digital '2' is detected again within the time of T2), then the microcontroller 1 sends a signal corresponding to the safety key 9 to be used by the user to the corresponding photoelectric coupler 7, the output is amplified by the triode Q4 and then drives the relay 8, and the function that the safety key 9 can be automatically pressed without contact is realized.
Referring to fig. 4, a general diagram of an internal control circuit of the safety key includes a microcontroller 1, a reflective photoelectric sensor receiver 2, a reflective photoelectric sensor transmitter 6, a triode Q, an in-phase buffer 3, a voltage comparator 4, a photoelectric coupler 7, a diode D, a relay 8, a safety key 9, and necessary resistor capacitors. Microcontroller 1 exports low level control signal to the light intensity detection circuit earlier, switch on triode Q2, and triode Q1 and Q3 are in the off-state, reflection type photoelectric sensor's transmitter 6 is out of work, receiver 2 only receives the ambient light intensity, convert to the magnitude of voltage and charge for memory capacitor 5 after through in-phase buffer 3, keep corresponding magnitude of voltage in memory capacitor 5, this moment because triode Q3 ends, voltage comparator 4 is out of work, avoided transmitting the maloperation signal to microcontroller 1, the circuit is in the light intensity signal acquisition stage. After the T1 time delay, the microcontroller 1 outputs high level control signals to each light intensity detection circuit immediately, the triode Q2 is cut off, the Q1 and the Q3 are conducted, the emitter 6 of the reflection type photoelectric sensor is powered on to emit infrared light, the infrared light is reflected by a hand right in front of the key 9 and then is received by the receiver 2, the light intensity is the sum of the ambient light intensity and the reflected light intensity, and the receiver 2 outputs corresponding electric signals to the non-inverting input end of the voltage comparator 4 through the non-inverting buffer 3. Since the transistor Q2 is in the off state, the memory capacitor (5) holds the voltage corresponding to the previous ambient light intensity and outputs the voltage to the inverting input terminal of the voltage comparator 4. Since the transistor Q3 is in the on state, the voltage comparator 4 operates normally, and outputs a low level signal to the microcontroller 1 because the voltage level at the non-inverting input terminal is smaller than the voltage level at the inverting input terminal. After receiving the first low level signal, microcontroller 1 starts T2 time delay, judge whether the user continues to be close to other buttons during this period (if the user will go to the two-digit floor or the negative floor), microcontroller 1 will send low level control signal to the drive circuit of corresponding button 9 after the short time delay is over, put through optoelectronic coupler 7, drive triode Q4 (diode D plays the effect of overcurrent protection triode), the signal after the amplification drives relay (8) again, make its normally open contact closed, correspond button 9 and press automatically, realize the safety button function, furthest reduces and potential virus contact, prevent that the virus from propagating through the elevator button.
Referring to fig. 5, the partial enlarged schematic diagram of the safety key control circuit in the elevator car comprises various (0-9-),
"F") internal control circuitry for the security key.
Referring to fig. 6, the partial enlarged schematic diagram of the control circuit of the safety key outside the elevator car comprises the internal control circuit of the safety keys '△' and '▽' for opening the door at each floor.
Referring to fig. 7 and 8, the enlarged schematic diagram of the internal control circuit of the digital "0" safety key includes a key light intensity detection circuit fig. 7 and a partial enlarged view of the key driving circuit fig. 8.
An intelligent elevator safety key input device for preventing and controlling virus infection comprises an elevator safety key 9 with good light transmission performance, wherein the elevator safety key 9 is made of light transmission hard glass materials, a control circuit is arranged in the elevator safety key 9 and consists of a microcontroller 1 and a peripheral sub-circuit, the peripheral sub-circuit comprises a reflection type photoelectric sensor receiver 2, a reflection type photoelectric sensor emitter 6, a triode Q, an in-phase buffer 3, a voltage comparator 4, a photoelectric coupler 7, a diode D, a relay 8, a safety key 9, an LED display device 10 and a necessary resistance capacitor, a light intensity detection circuit (specifically arranged position) memorizes the current environmental light intensity under the control of the microcontroller 1 and converts the current environmental light intensity into a voltage signal to be stored in a memory capacitor 5, and the reflection type photoelectric sensor receiver 2 converts the total light intensity reflected into the interior of the safety key 9 into a voltage signal, the elevator safety key is input into the voltage comparator 4 through the in-phase buffer 3, signals are transmitted to the microcontroller 1 after being compared with the memory voltage, after the microcontroller 1 detects a key to be used by a user, the output signals control the safety key driving circuit, and after being driven by the photoelectric coupler 7 and the triode Q4, the normally open contact of the relay 8 is controlled to be closed, so that the function of automatically pressing the elevator safety key 9 is realized.
The reflective photoelectric sensor comprises a microcontroller 1, a reflective photoelectric sensor receiver 2, a reflective photoelectric sensor emitter 6, a voltage comparator 4, a photoelectric coupler 7 and an LED display device 10, wherein the microcontroller 1 is a low-power-consumption embedded microcontroller LPC2103 with stable performance, the reflective photoelectric sensor emitter 6 is controlled by the microcontroller 1, the voltage comparator 4 compares electric signals corresponding to light intensity changes and outputs the electric signals to the microcontroller 1, the microcontroller 1 processes the signals and then outputs low-level control safety key driving circuits to the photoelectric coupler 7, and the LED display device 10 is used for assisting an administrator in elevator parameter setting.
Four triodes Q are arranged in each safety key control circuit, the four triodes Q1, Q2, Q3 and Q4 are controlled by the microcontroller 1 and control other devices, Q1, Q2 and Q3 are arranged in the light intensity detection circuit, Q1 controls the work of the emitter 6 of the reflection type photoelectric sensor, Q2 controls the charging of the memory capacitor 5 and memorizes the light intensity of the environment, Q3 controls the work of the voltage comparator 4, Q4 is arranged in the safety key drive circuit, the current output by the photoelectric coupler 7 is amplified and then drives the relay 8 to work, and the diode D plays a role of overcurrent protection triode Q4.
The reflective photoelectric sensor receiver 2 and the reflective photoelectric sensor emitter 6 are arranged in the light intensity detection circuit, the power supply of the reflective photoelectric sensor emitter 6 is controlled by a triode Q1 controlled by the microcontroller 1, when the microcontroller 1 outputs a low level, the reflective photoelectric sensor emitter 6 does not work, the electric signal output by the reflective photoelectric sensor receiver 2 only represents the ambient light intensity and is stored in the memory capacitor 5, after the microcontroller 1 outputs a high level control signal, the power supply of the reflective photoelectric sensor emitter 6 is switched on to emit infrared light, the infrared light is reflected by a hand right in front of the safety key 9 and then received by the reflective photoelectric sensor receiver 2, and the electric signal corresponding to the total light intensity (the ambient light intensity plus the reflected light intensity) is output to the in-phase buffer 3.
The in-phase buffer 3 is formed by connecting operational amplifiers, the input of the in-phase buffer is connected with the output end of the receiver 2 of the reflection type photoelectric sensor, an electric signal corresponding to light intensity is obtained, on one hand, the influence of a rear-stage circuit on an input signal is isolated, on the other hand, the driving capability is increased, so that the memory capacitor (5) can quickly track the input signal, and the purpose of memorizing the current environmental light intensity is achieved.
The power supply of the voltage comparator 4 is controlled by a triode Q3 controlled by the microcontroller 1, the in-phase input end of the voltage comparator is connected with the in-phase buffer 3 during working, the voltage corresponding to the total light intensity (the ambient light intensity + the reflected light intensity) is input, the reverse-phase input end of the voltage comparator is connected with the memory capacitor 5, the voltage corresponding to the ambient light intensity is input, and the two are compared to output signals to the microcontroller 1 for processing.
The memory capacitor 5 is used for memorizing the voltage quantity corresponding to the current environmental light intensity output by the front-stage circuit before the safety key is used and is used as a reference voltage, after the safety key is fully charged, the triode Q2 is controlled to be cut off by the microcontroller 1, the memory capacitor 5 outputs the environmental reference voltage to the inverting input end of the voltage comparator 4, the voltage quantity corresponding to the total light intensity (the environmental light intensity and the reflected light intensity) of the non-inverting input end is compared and then is output to the microcontroller 1, and the automatic detection function of the safety key 9 is realized.
The photoelectric coupler 7 is connected in the safety key driving circuit, is controlled by the microcontroller 1, is used as an optical coupler to realize the conversion of an electric-optical-electric signal, increases the function of electric isolation, reduces interference, and outputs to drive the triode Q4 so as to drive the relay 8 to act.
And the coil of the relay 8 is connected with the triode Q4 and is driven by the amplified current, the normally open contact of the relay 8 is closed, and the corresponding key 9 is automatically pressed.
The safety key 9 is made of a light-transmitting hard glass material, infrared light inside the key 9 can fully penetrate through the safety key 9, the infrared light is reflected by a hand right in front of the safety key 9 and then penetrates through the safety key 9 again, the infrared light is received by the receiver 2 of the reflection type photoelectric sensor to generate a corresponding electric signal, the two ends of the safety key 9 are connected in parallel with an anti-shake capacitor, interference is reduced, and stability of the safety key is further enhanced.
The LED display device 10 is connected with the microcontroller 1 and is mainly used for an administrator operating system, the administrator approaches an 'F' key 2s in the safety key 9 with hands, the LED display device 10 can prompt password authentication, and after the password authentication is correct, the elevator parameter setting mode is entered, parameter setting of 'ambient light intensity acquisition time T1', 'key signal temporary storage time T2', 'floor upper limit' and 'floor lower limit' is sequentially carried out, and the device can be automatically stored after the setting is finished. If an error occurs, the administrator can reset and clear the key by placing the hand right in front of the 'F' key for 2s again, namely, the parameters are set again, and the specific values are determined according to the actual conditions of installation environments in different regions.
The "ambient light intensity acquisition time T1" ensures that the memory capacitor 5 can be fully charged to a voltage stable state, the voltage of the memory capacitor can accurately represent the current ambient light intensity, and T1 generally does not exceed 1 ms. The "key signal temporary storage time T2" is mainly used in the case where the user wants to go to a two-digit floor or a ground floor: when the microcontroller 1 detects the first key input by the user, the response is not immediate, but a short T2 delay is generated, so that the user can input a second digit in sufficient time, in general, 2s is set at T2, the 'upper floor limit' and the 'lower floor limit' form an effective key range, the effective amount is determined according to the actual floor number of the building, the input exceeding the range is invalid, and the key driving circuit cannot be started.
Claims (9)
1. An intelligent elevator safety key input device for preventing and controlling virus infection is characterized by comprising an elevator safety key (9), wherein a control circuit is arranged in the elevator safety key (9), the control circuit is composed of a microcontroller (1) and a peripheral sub-circuit, the peripheral sub-circuit comprises a reflection type photoelectric sensor receiver (2), a reflection type photoelectric sensor emitter (6), a triode Q, an in-phase buffer (3), a voltage comparator (4), a photoelectric coupler (7), a diode D, a relay (8), the safety key (9), an LED display device (10) and a necessary resistance capacitor, a light intensity detection circuit is arranged in the elevator safety key (9), the light intensity detection circuit memorizes current environmental light intensity under the control of the microcontroller (1) and converts the current environmental light intensity into a voltage signal to be stored in a memory capacitor (5), reflection type photoelectric sensor receiver (2) are arranged in getting into the inside total light intensity of safety button (9) with the reflection and turn into voltage signal, input in voltage comparator (4) behind cophase buffer (3), with memory voltage comparison after to microcontroller (1) transmission signal, microcontroller (1) detects the button that the user will use after, output signal control safety button drive circuit, through optoelectronic coupler (7), triode Q4 drive back, control relay (8) normally open contact is closed, be used for realizing that elevator safety button (9) are automatic to be pressed.
2. The intelligent elevator safety key input device for preventing and controlling virus infection according to claim 1, it is characterized in that the microcontroller (1) is directly connected with the reflective photoelectric sensor receiver (2), the reflective photoelectric sensor emitter (6), the voltage comparator (4), the photoelectric coupler (7) and the LED display device (10), the microcontroller (1) is a low-power-consumption embedded microcontroller LPC2103, the emitter (6) of the reflective photoelectric sensor is controlled by the microcontroller (1), the voltage comparator (4) compares the electric signals corresponding to the light intensity change and outputs the electric signals to the microcontroller (1), the microcontroller (1) processes the signals and outputs low level to the photoelectric coupler (7) to control the safety key driving circuit, the LED display device (10) is used for assisting an administrator in setting elevator parameters.
3. The intelligent elevator safety key input device for preventing and controlling virus infection according to claim 1, characterized in that four triodes Q are provided in each safety key control circuit, four triodes Q1, Q2, Q3 and Q4 are all controlled by the microcontroller 1 and control other devices, Q1, Q2 and Q3 are in the light intensity detection circuit, Q1 is used for controlling the operation of the emitter 6 of the reflective photoelectric sensor, Q2 is used for controlling the charging of the memory capacitor 5, Q3 is used for controlling the operation of the voltage comparator 4, and Q4 is in the safety key drive circuit and amplifies the current output by the photoelectric coupler (7) to drive the relay (8) to operate.
4. The intelligent elevator safety key input device for preventing and controlling virus infection according to claim 1, characterized in that the reflective photoelectric sensor receiver (2) and the reflective photoelectric sensor emitter (6) are in a light intensity detection circuit, and the power supply of the reflective photoelectric sensor emitter (6) is controlled by a triode Q1 controlled by the microcontroller (1).
5. An intelligent elevator safety key input device for preventing and controlling virus infection according to claim 1, characterized in that the in-phase buffer (3) is formed by connecting operational amplifiers, and the input of the in-phase buffer is connected with the output end of the receiver (2) of the reflection type photoelectric sensor.
6. The intelligent elevator safety key input device for preventing and controlling virus infection according to claim 1, characterized in that the safety key (9) is made of transparent hard glass material, and the two ends of the safety key (9) are connected in parallel with an anti-shake capacitor.
7. An intelligent elevator safety key input method for preventing and controlling virus infection is characterized by comprising the following steps;
the user only needs to place the hand right in front of the safety key (9) without touching, and the microcontroller (1) can control the corresponding key (9) to be automatically pressed down after the short time delay T2; if the user wants to go to a negative floor (such as a second floor), hands are sequentially placed right in front of the safety keys of the- (2) and the (2), and the safety key (9) is automatically closed after a short time delay T2; if the user wants to input two-digit floors such as 12 floors, the user puts hands in front of the keys 1 and 2 in sequence in the same way, the microcontroller (1) delays T2 for a short time to ensure that the user finishes inputting, and then the relay (8) is controlled to automatically press the corresponding safety key (9) to start the elevator;
when a user wants to go up and down the floor outside the car, the microcontroller (1) can control the corresponding key (9) to be automatically pressed only by approaching a hand to the △ or ▽ key;
the acquisition of the environmental light intensity and the comparison of the voltage quantity corresponding to the light intensity reflected by the key (9) are controlled by the control signal output by the microcontroller (1), the microcontroller (1) firstly sends a low level control signal and lasts for a time T1, at the moment, the emitter (6) of the reflective photoelectric sensor does not work, and the receiver (2) of the reflective photoelectric sensor only receives the environmental light intensity, outputs a corresponding electric signal and stores the corresponding electric signal in the memory capacitor (5) as the reference voltage of the environmental light intensity;
the short time delay T1 of the microcontroller 1 can ensure that the ambient light intensity is fully collected and the voltage of the memory capacitor (5) is stable, then a high level is output and the short time delay T2 is output, the emitter (6) of the reflective photoelectric sensor emits infrared light, after the infrared light is reflected by a hand right in front of the safety key (9), the enhanced light is received by the reflective photoelectric sensor receiver (2) and is output as a corresponding voltage quantity, the infrared light passes through the in-phase buffer (3) and is input to the in-phase input end of the voltage comparator (4), the memory capacitor (5) inputs the previously collected ambient reference voltage to the reverse phase input end of the voltage comparator (4), and the voltage comparator (4) outputs a low level signal to the microcontroller (1);
after receiving a first low level signal sent by the voltage comparator (4), the microcontroller (1) judges whether the user still contacts other digital keys or not through time delay T2, so that whether the user wants to go to a one-digit floor or a two-digit floor is determined, and after the time delay T2 is finished, if the user goes to the one-digit floor, the relay (8) is driven to automatically press the safety key (9); if the user goes to two floors, the relay (8) automatically presses the corresponding two keys, and then the function of the high-rise elevator is realized by the least safety keys.
8. The intelligent elevator safety key input method for preventing and controlling virus infection according to claim 7, characterized in that the microcontroller (1) is connected with an LED display device (10) and is mainly used for an administrator operating system, the administrator approaches an 'F' key 2s in the safety key (9) with hands, the LED display device (10) prompts password authentication, and enters an elevator parameter setting mode after the password authentication is correct, so as to sequentially perform parameter setting of 'ambient light intensity acquisition time T1', 'key signal temporary storage time T2', 'upper floor limit', 'lower floor limit', and the device can be automatically stored after the setting is completed. If an error occurs, the administrator puts the hands right in front of the F key again for 2s to reset and clear, namely, the parameters are set again, and the specific numerical values are determined according to the actual conditions of installation environments in different regions;
wherein, the "ambient light intensity acquisition time T1" ensures that the memory capacitor (5) can be fully charged to a voltage stable state, the voltage can accurately show the current ambient light intensity, T1 generally does not exceed 1ms, and the "key signal temporary storage time T2" is mainly used for the condition that the user wants to go to a two-digit floor or an underground floor: when the microcontroller (1) detects a first key input by a user, the first key does not respond immediately, but short T2 delay is generated, the purpose is to input a second digit for the user with sufficient time, in general, 2s is set for T2, the 'upper floor limit' and the 'lower floor limit' form an effective key range, the setting is carried out according to the actual floor number of a building, the input exceeding the range is invalid, and a key driving circuit cannot be started.
9. The intelligent elevator safety key input method using anti-virus infection as claimed in claim 7, characterized in that after the elevator is initialized, the administrator can reset the elevator parameters through password authentication, or continue to use the previous set value, then the microcontroller (1) sends out control signal, first outputs low level control lasting T1 time to make the emitter (6) of the reflective type photoelectric sensor not work, its receiver (2) only receives the ambient light intensity, converts it into voltage quantity to be stored in the memory capacitor (5), if no user uses the elevator, it continuously updates and memorizes the change of the ambient light intensity in the elevator car, if the user uses the elevator key, the microcontroller (1) sends out high level control signal to make the emitter (6) of the reflective type photoelectric sensor work, at this time, the receiver (2) receives the ambient light intensity and the reflected light intensity, convert into corresponding magnitude of voltage and send into voltage comparator (4), voltage comparator (4) carry out output signal after comparing and give microcontroller (1), microcontroller 1 signal of keeping in temporary storage, wait whether other safety button will use in the T2 time still, then microcontroller (1) sends the signal that safety button (9) that the user will use correspond to corresponding optoelectronic coupler (7), output drives relay (8) after triode Q4 enlargies, realize that safety button (9) need not contact can the function of pressing automatically.
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