CN107561992B

CN107561992B - Intelligent kitchen fixed heat source monitoring and reminding device and method

Info

Publication number: CN107561992B
Application number: CN201711000063.7A
Authority: CN
Inventors: 董兵; 沈晓春
Original assignee: Guangdong Industry Technical College
Current assignee: Guangdong Industry Technical College
Priority date: 2017-10-24
Filing date: 2017-10-24
Publication date: 2023-10-27
Anticipated expiration: 2037-10-24
Also published as: WO2019080341A9; SG11202003631QA; CN107561992A; WO2019080341A1

Abstract

The invention discloses an intelligent kitchen fixed heat source monitoring reminding device and method, wherein the device comprises a controller, a stepping motor control circuit, an infrared detector, a stepping motor 0-degree position identification circuit, a state indicator lamp, keys and a voice circuit, wherein the stepping motor control circuit, the infrared detector, the stepping motor 0-degree position identification circuit, the state indicator lamp, the keys and the voice circuit are connected with the controller; the stepping motor control circuit is connected with a stepping motor; the infrared detector comprises a driving circuit, a binary pyroelectric infrared sensor, a filter amplifier, a grid curtain executing mechanism and a Fresnel lens. The method disclosed by the invention comprises the steps of automatically identifying the opening state of the fixed heat source when a kitchen is unmanned through the data analysis of two states of human body monitoring and heat source scanning, automatically determining the voice playing period according to the radiation intensity of the fixed heat source, and automatically playing voice alarm information. The intelligent household control system can effectively monitor the fixed heat source in the kitchen and realize intelligent household control under the conditions of automatic identification of indoor people and no people.

Description

Intelligent kitchen fixed heat source monitoring and reminding device and method

Technical Field

The invention relates to the field of heat source monitoring and reminding research, in particular to an intelligent kitchen fixed heat source monitoring and reminding device and method.

Background

Along with the continuous acceleration of the aging steps of China, potential safety hazards caused by improper use of fixed heat sources (gas stove fire, electromagnetic oven, electric frying pan and the like) in a kitchen are also increasing. As the memory of the aged is reduced, the fire (or the kitchen appliance switch) is forgotten frequently, so that food in a pot on the kitchen fire is heated for a long time, food boiling paste occurs, the condition that an electromagnetic oven, an electric frying pan and a pot burn out occurs, and particularly, the gas fire burns in an unattended state for a long time, and the danger of life and property safety such as fire and the like can be brought. In the prior art, the intelligent household control device is not specially used for monitoring and reminding the fixed heat source in the kitchen, so that the intelligent household control device can automatically identify whether the fixed heat source exists in the kitchen or not under the condition of people exist in the kitchen, thereby effectively preventing kitchen fire accidents and danger of life and property safety, improving life safety quality and being the direction of research of technicians in the field.

Disclosure of Invention

The invention mainly aims to overcome the defects and shortcomings of the prior art, and provides an intelligent kitchen fixed heat source monitoring reminding device and method, which have two states of human body monitoring and heat source scanning monitoring, and solve the problem that the existing infrared monitoring device cannot automatically identify a static human body and a fixed heat source, so that the fixed heat source of a kitchen can be effectively monitored, and the safe intelligent household control of the kitchen is realized.

In order to achieve the above purpose, the invention adopts the following technical scheme:

the invention relates to an intelligent kitchen fixed heat source monitoring and reminding device which comprises a controller, a stepping motor control circuit, an infrared detector, a stepping motor 0-degree position identification circuit, a status indicator lamp, keys and a voice circuit, wherein the stepping motor control circuit, the infrared detector, the stepping motor 0-degree position identification circuit, the status indicator lamp, the keys and the voice circuit are connected with the controller; the stepping motor control circuit is connected with a stepping motor; the infrared detector is used for completing the monitoring of a mobile human body and the detection of the infrared radiation quantity of all fixed heat sources in a kitchen and comprises a driving circuit, a binary pyroelectric infrared sensor, a filter amplifier, a grid executing mechanism and a Fresnel lens, wherein the filter amplifier is connected with a controller, the binary pyroelectric infrared sensor is connected with the filter amplifier, the Fresnel lens is arranged at the front end of the binary pyroelectric infrared sensor, the driving circuit is connected with the controller, and the grid executing mechanism is connected with the driving circuit; the driving circuit is used for generating forward and reverse direct current to flow through the direct current electromagnet under the control of the controller; the grid curtain executing mechanism is used for realizing automatic switching of two states of human body monitoring and heat source scanning under the drive of the driving circuit; the dual pyroelectric infrared sensor is used for identifying a moving heat source; the Fresnel lens is used for gathering infrared rays radiated by a target to a binary pyroelectric infrared sensor positioned at a lens focus, the binary pyroelectric infrared sensor is used for identifying a moving heat source, and the filter amplifier is used for filtering and amplifying weak pulse signals output by the binary pyroelectric infrared sensor.

As a preferable technical scheme, the Fresnel lens gathers infrared rays radiated by a target to a binary pyroelectric infrared sensor positioned at a lens focus through a narrow band of concentric circles on a mirror surface of the Fresnel lens, and divides an induction angle into an interval 'bright area' and an interval 'dark area', and when a human body moves to the induction angle, generated continuous light pulses are radiated to the binary pyroelectric infrared sensor.

As an optimal technical scheme, the grid executing mechanism comprises a direct-current electromagnet, a direct-current electromagnet fixing frame, a permanent magnet, a limiting baffle, a grid stay bar and three hinges, wherein the three hinges are coaxially connected in a cylindrical lamination manner; the direct-current electromagnet is arranged in the direct-current electromagnet fixing frame; the permanent magnet is fixed at the root of the grid support rod; the lower part of the grid support rod is used for installing a grid; the grid curtain stay bar is made of nonferrous metal, a round permanent magnet is fixed at the root of the grid curtain stay bar through four screw fixing holes, the surface area of the round permanent magnet is consistent with that of a direct current electromagnet, the other two screw fixing holes are used for fixedly connecting the grid curtain stay bar with a second hinge, and a grid curtain installed below the grid curtain stay bar is made of black paper so as to lighten the weight of the grid curtain.

As a preferable technical scheme, the model of the filter amplifier is BIS0001; the stepping motor is driven by a driver ULN2003 to drive a 28BYJ48 type stepping motor; the voice circuit adopts an ISD1700 voice chip; the controller adopts an STC15F2K60S2 singlechip.

As an optimal technical scheme, the controller, the voice circuit and the stepping motor 0-degree position recognition circuit are arranged in the shell, and the status indicator lamp and the keys are arranged on a front panel of the shell; the infrared detector is connected to a stepping motor in the shell through a stepping motor rotating shaft.

As an optimal technical scheme, the 0-degree position identification circuit of the stepping motor consists of an LED lamp on a middle line of the infrared detector and a photoresistor in a gap at the 0-degree position on the middle line of the box body; the LED lamp on the mid-line of the infrared detector is a 0-degree position lamp;

the keys are arranged at the bottom end of the box body; the state indication is respectively represented by three LED lamps as three working states of heat source scanning, human body monitoring and system self-checking.

The power supply is realized by the switch power supply module and is used for generating +5V and +12V power supplies, and the +5V power supplies supply power to a stepping motor control circuit, a stepping motor 0-degree position identification circuit, a status indicator lamp, a language circuit and the stepping motor of a controller in the box body; the +12V power supply supplies power to the infrared detector through an external signal power line.

The invention also provides a monitoring method of the intelligent kitchen fixed heat source monitoring reminding device, which comprises the following steps:

s1, starting up and initializing; when no person enters the kitchen and all the fixed heat sources in the kitchen are closed, the power key of the device is pressed, and the system firstly performs measurement of initialization data;

s2, recognizing that a mobile human body target enters a kitchen; after the startup initialization is completed, the system is switched into a human body monitoring state; when a person enters a kitchen, the binary pyroelectric infrared sensor filters and amplifies a received pulse signal of infrared radiation of a mobile human body, then sends the pulse signal to the controller for signal processing, and after the fact that a mobile human body target exists in an induction angle is judged, the controller of the device sends a control instruction to a driving circuit in the infrared detector to drive a direct current electromagnet to generate a magnetic pole with polarity different from that of a permanent magnet on a grid support rod, and a second grid is attracted to a direct current electromagnet fixing frame, namely the second grid is closed, and the first grid is kept open unchanged, so that the induction angle is halved; when the human body target is monitored, the device indicates that a human body enters a kitchen, the device does not alarm a heat source, otherwise, the device is used as the human body to enter the kitchen for treatment, and the device returns to a human body monitoring state;

S3, recognizing that a mobile human body target leaves the kitchen; after the human body is confirmed to enter a kitchen, a controller of the device sends a control instruction to a driving circuit in the infrared detector, and the process of the step S2 is opposite to that of the first grid to the position of the direct current electromagnet fixing frame, namely the first grid is closed, and the second grid is kept open unchanged, so that the induction angle is halved; when the human body target is monitored, indicating that the mobile human body leaves the kitchen, otherwise, processing the mobile human body as a person in the kitchen, and returning to a human body monitoring state;

s4, identifying whether a fixed heat source is started in an unmanned state in the kitchen; firstly, judging whether the kitchen is in an unmanned state or not in a human body monitoring state, and when the unmanned state in the kitchen is monitored, starting to identify the opening state of a fixed heat source in the kitchen;

s5, identifying the heat source danger degree and automatically giving an alarm by voice; when the fire on the fixed heat source in the induction angle is big fire, the infrared radiation quantity is big, the collected infrared data is big, and the detection is continuously carried out for N times a _i When the number value of (2) exceeds the set maximum value, the controller automatically accelerates the playing of the voice circuit for a set time period, and when the set playing time is reached, the controller controls the voice circuit to send out 'you have a fire on the kitchen is on, the fire is larger, you have left the kitchen for XX minutes, please pay attention to safety'; when the furnace fire is small fire, the infrared radiation quantity is small, the collected infrared data is small, and the continuous detection is carried out for N times a _i When the value of the number exceeds the set minimum value, the controller automatically lengthens the play set time period of the voice circuit, and when the set play time is reached, the controller controls the voice circuit to send out 'the kitchen is on with fire, the fire is small fire, the kitchen is away from XX minutes, and the safety is noted'; when the fire is middle fire, the infrared radiation amount is medium, the collected infrared data is between the intermediate values, and the a is continuously detected for N times _i When the value of (2) exceeds the set intermediate value, the controller automatically plays the voice circuit for a set time period to be moderate, and when the set play time is reached, the controller controls the voice circuit to send out 'you have a fire in a kitchen is on, the fire is the intermediate fire, you leave the kitchen for XX minutes, please note safety';

s6, re-acquisition and updating of initialization data; when step S4 determines that no person is in the kitchen and no fixed heat source is on, the initial comparison value will change due to uncertainty of the current environment including sunlight and infrared radiation, temperature difference between day and night, and opening and closing of kitchen windows, and re-measurement is needed, and the method is the same as step S1, wherein the initial comparison value V of the human monitoring state is obtained by re-measurement _n And the initial comparison value A of the fixed heat source at each angle in the heat source scanning state _i Covering the original value, providing initialization data for the next recognition, and entering the next step;

s7, storing the fixed heat source and the static human body angle; resetting the timing of the alarm accumulated time, storing the confirmed fixed heat source and static human body angle, and preparing for the next time the user uses the kitchen;

s8, self-checking test; the self-checking button is pressed, at the moment, the system self-checking lamp is on, the controller firstly enters a human body monitoring state, when the infrared receiver receives a mobile human body signal and can recognize the mobile human body signal, the corresponding human body monitoring lamp is on, and otherwise, the human body monitoring lamp is flashing, so that the state has a fault; the controller then enters the heat source scanning, the direct current electromagnetic suction belt drives the grid curtain stay bars to be closed, the stepping motor performs scanning movement, when the infrared receiver receives a fixed heat source signal and can perform azimuth identification, the corresponding heat source scanning lamp is lighted, and otherwise, the heat source scanning lamp is lighted.

As a preferred technical solution, in step S1, the measurement of the initialization data includes the following steps:

s11, entering a human body monitoring state; the controller of the device firstly sends a control instruction to a driving circuit in the infrared detector, drives the grid executing mechanism to generate driving force, namely, the direct current electromagnet generates magnetic poles with the same polarity as that of the permanent magnet on the grid supporting rod, and pushes the two grids to the position of the limiting baffle plate, so that the first grid and the second grid are both opened, the infrared detector is at the 0-degree position, and the device is in a human body monitoring state;

S12, collecting an initial comparison value V of the human body monitoring state _n The method comprises the steps of carrying out a first treatment on the surface of the The controller controls the stepping motor to return to the 0 degree position after stepping by 1 degree and 18Hz of stepping pulse frequency and +5 degrees, and simultaneously stores the infrared data value V measured by the infrared detector in the state _n As an initial comparison value identifying that no person is in the kitchen and no fixed heat source is on, storing in a data memory of the controller; the infrared data value V _n Namely, the initial comparison value V of the human body monitoring state _n ；

S13, entering a heat source scanning state; the controller of the device sends a control instruction to a driving circuit in the infrared detector again, and drives the grid executing mechanism to generate attraction force, namely, the direct current electromagnet generates magnetic poles with different polarities from the permanent magnets on the grid supporting rods, and the two grids are attracted to the positions of the direct current electromagnet fixing frame to enable the first grid and the second grid to be closed, so that the infrared detector is at the 0-degree position, and the device is in a heat source scanning state;

s14, collecting initial comparison value A of fixed heat source at each angle in heat source scanning state _i The method comprises the steps of carrying out a first treatment on the surface of the The controller controls the stepping motor to jump back to the 0-degree position after stepping by +90 degrees at the stepping angle of 1-degree and the stepping pulse frequency of 18Hz, and simultaneously stores the infrared data value A measured by the infrared detector at every 1-degree in the state ₊₁ ，…A _+i …A ₊₈₉ ,A ₊₉₀ In a data memory of the controller; similarly, scanning from 0 deg. to-90 deg. and storing the infrared data value A measured by the infrared detector every 1 deg. in this state _-1 ，…A _-i …A _-89 ,A _-90 In a data memory of the controller; the infrared data value A _i I.e. the initial comparison value A of the fixed heat source _i 。

As a preferable technical solution, in step S4, the step of identifying whether the fixed heat source is turned on in the unmanned state in the kitchen includes the following steps:

s41, the device recognizes the human body running-out mode from the human body monitoring state to be switched into the human body monitoring state, when the moving human body is monitored, the device returns to the step S3 according to the fact that people in a kitchen process, and otherwise, the device enters the next step;

s42, infrared radiation current value v in human body monitoring state induction angle _n Is obtained and compared; the controller controls the stepping motor to return to the 0 degree position after stepping by 1 degree and 18Hz of stepping pulse frequency and +5 degrees, and simultaneously stores the infrared data value v measured by the infrared detector in the state _n And comparing with an initial comparison value V which is stored in the data memory, is unmanned in the kitchen and has no fixed heat source on _n Comparing, if v _n >V _n Indicating that no person exists in the kitchen, starting a fixed heat source, entering the next step of identification, otherwise, judging that no person exists in the kitchen, starting no fixed heat source, and returning to the step S2;

S43, collecting heat source data of 0-90 degrees in a heat source scanning state; the controller further controls the stepping motor to step the angle1 degree and stepping pulse frequency 18Hz, stepping +90 degree and then jumping back to 0 degree position, and simultaneously measuring infrared data value a of the infrared detector at every 1 degree in the state ₊₁ ，…a _+i …a ₊₈₉ ,a ₊₉₀ Stored in a data memory of the controller;

s44, entering a human body monitoring state and staying for T1 time, when a mobile human body is monitored, processing according to the existence of people in a kitchen, returning to the step S3, and otherwise, entering the next step;

s45, collecting heat source data of 0-90 degrees in a heat source scanning state; in the same step S43, the controller controls the stepping motor to jump back to the 0 degree position after stepping by-90 degrees at a stepping angle of 1 degree and a stepping pulse frequency of 18Hz, and the infrared data value a measured by the infrared detector at each 1 degree in the state _-1 ，…a _-i …a _-89 ,a _-90 Stored in a data memory of the controller;

s46, entering a human body monitoring state, staying for T2 time, when a mobile human body is monitored, processing according to the existence of people in a kitchen, returning to the step S3, and otherwise, entering the next step;

s47, comparing infrared radiation data of the fixed heat sources at all angles; infrared data value a of heat source actually measured at each angle _i Initial comparison value A with fixed Heat Source _i Comparison, if a _i >A _i Indicating that there is a fixed heat source at the angle i, otherwise, returning to step S4 to measure a _i And for each group of data a _i Comparing the values with the upper group, wherein the value rise indicates that the heat source temperature rises, otherwise, the heat source temperature falls; the numerical value is large, the heat source temperature is high, the detection is continuously carried out for N times, when the numerical value of the angle is higher than a set value, the angle is stored, the next step is carried out, otherwise, when all the angle data are lower than the set value, no person is judged to be in the kitchen, no fixed heat source is started, and the step S6 is carried out;

s48, identifying a static human body in the kitchen; continuously detecting a for N times _i Comparing the values with the upper group, when a _i Numerical value is mutated to A or less _i And remain unchanged, indicating that there is a static human body at angle i, and the human body leaves to cause infrared radiationData are mutated and reduced and treated according to someone in the kitchen; otherwise, the next step is carried out.

Compared with the prior art, the invention has the following advantages and effects:

1. according to the invention, through the data analysis of two states of human body monitoring and heat source scanning, whether a person uses various heat sources in a kitchen is automatically identified, and when the human body leaves the kitchen and the heat source is not closed, the voice playing period can be automatically determined according to the radiation intensity of the fixed heat source, and the voice alarm information can be automatically played.

2. The invention uses the controller to control the opening and closing switching of the grid curtain, realizes the automatic switching of two states of human body monitoring and heat source scanning, and solves the problem that the existing infrared monitoring device can not automatically identify the static human body and the fixed heat source.

3. According to the invention, the controller collects and processes the radiation values of all directions of the infrared detector under the heat source scanning state, so that the automatic identification of the fixed heat source direction and the radiation intensity is realized.

4. The intelligent household control system is also suitable for intelligently identifying the characteristics of the indoor stationary or movable human body, and can perform angle positioning on the indoor static human body, so that intelligent household control under the conditions of automatically identifying the indoor presence and absence of people is realized.

Drawings

FIG. 1 is a schematic diagram of the circuit components of the intelligent kitchen fixed heat source monitoring and reminding device;

FIG. 2 is a side view of the intelligent kitchen fixed heat source monitoring reminding device;

FIG. 3 is a front view of the intelligent kitchen fixed heat source monitoring reminding device structure of the invention;

FIG. 4 is a schematic diagram of an infrared detector grid actuator structure of the present invention;

FIG. 5 is a schematic diagram of an exploded construction of an infrared detector grid actuator of the present invention;

FIG. 6 is a schematic diagram of the operation of the infrared detector of the present invention in a heat source scanning state;

FIG. 7 is a schematic diagram of the operation of the infrared detector of the present invention in a human monitoring state;

FIG. 8 is a schematic diagram of the operation of the infrared detector of the present invention in a human monitoring state to identify a moving human entering mode;

FIG. 9 is a schematic diagram of the operation of the infrared detector of the present invention in a human monitoring state to identify human walk-out mode;

fig. 10 is a software program flow chart of the present invention.

The reference numerals in the figures illustrate: 1. an infrared detector; 2. a case body; 3. a stepping motor rotating shaft; 4. externally connecting a signal power line; 5. a stepping motor; 6. a circuit board; 7. a controller; 8. an external horn interface; 9. a key; 10. a status indication; 11. a 0 ° position gap; 12. a 0 ° position light; 13. a Fresnel lens; 14. sensing an angle; 15. a direct current electromagnet; 16. a direct current electromagnet fixing frame; 17. a first hinge; 18. a second hinge; 19. a third hinge; 20. a limit baffle; 21. grid supporting rods; 22. a permanent magnet; 23. a grid curtain; 24. a binary pyroelectric infrared sensor; 25. a first grid; 26. a second grid; 27. a gate slit.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Examples:

as shown in fig. 1, the circuit composition of the intelligent kitchen fixed heat source monitoring and reminding device comprises a controller, a stepping motor control circuit, an infrared detector 1, a stepping motor 0-degree position identification circuit, a status indicator lamp, keys and a voice circuit, wherein the stepping motor control circuit, the infrared detector 1, the stepping motor 0-degree position identification circuit, the status indicator lamp, the keys and the voice circuit are connected with the controller; the stepping motor control circuit is connected with the stepping motor; the infrared detector is used for completing the monitoring of a mobile human body and the detection of the infrared radiation quantity of all fixed heat sources in a kitchen, and comprises a driving circuit, a binary pyroelectric infrared sensor, a filter amplifier, a grid executing mechanism and a Fresnel lens 13, wherein the filter amplifier is connected with a controller, the binary pyroelectric infrared sensor is connected with the filter amplifier, the Fresnel lens is arranged at the front end of the binary pyroelectric infrared sensor, the driving circuit is connected with the controller, and the grid executing mechanism is connected with the driving circuit.

As shown in fig. 2 and 3, the intelligent kitchen fixed heat source monitoring reminding device structure comprises an infrared detector 1 and a box body 2, wherein the infrared detector 1 and the box body 2 are connected through a stepping motor rotating shaft 3, and power supply of the infrared detector and detected infrared radiation signals are connected with a circuit in the box body through an external signal power line 4; the box body comprises a stepping motor 5, a circuit board 6 and a controller 7, an external horn interface 8 is arranged at the bottom of the side surface of the box body, a key 9, a state indication 10 and a 0-degree position gap 11 are arranged at the lower part of the front surface of the box body, the key 9 is sequentially provided with a self-checking key and a switching key from left to right, and the state indication 10 is sequentially provided with a human body monitoring key, a heat source scanning key and a system self-checking key from left to right; the front of the infrared detector is provided with a 0-degree position lamp 12.

The infrared detector is used for completing the monitoring of a mobile human body and the detection of the infrared radiation quantity of all fixed heat sources in a kitchen.

The Fresnel lens gathers infrared light radiated by a target to a binary pyroelectric infrared sensor positioned at a lens focus through a special concentric circle narrow band on a mirror surface of the Fresnel lens, and divides an induction angle into an interval 'bright area' and an interval 'dark area', and when a human body moves to the induction angle, generated continuous light pulses are radiated to the binary pyroelectric infrared sensor.

The dual pyroelectric infrared sensor is used for identifying a moving heat source. When no human body and heat source radiate infrared signals in the kitchen, the incident infrared rays are not output by the binary sensor. When the human body is stationary in the kitchen or the fixed heat source is started, the sensor does not output similar to the condition that the external infrared rays are incident. The binary pyroelectric infrared sensor receives different infrared radiation and outputs a pulse signal when and only when a human body moves in a kitchen or the infrared detector moves, and the amplitude of the pulse signal is proportional to the received infrared radiation.

The filter amplifier is used for filtering and amplifying the weak pulse signals output by the binary pyroelectric infrared sensor, and the model of the filter amplifier is BIS0001.

The driving circuit is used for generating forward or reverse direct current to flow through the miniature direct current electromagnet under the control of the controller, so that attraction force or thrust force to the permanent magnet on the grid support rod is generated, and the grid support rod on the hinge is driven to rotate, so that switching between two states of human body monitoring and heat source scanning is formed. The driving circuit is realized by two push-pull power amplifier circuits consisting of NPN type transistors and PNP type transistors which are symmetrical in pairs.

As shown in fig. 4 and 5, the grid actuating mechanism is composed of a direct current electromagnet 15, a direct current electromagnet fixing frame 16, a first hinge 17, a second hinge 18, a third hinge 19, a limit baffle 20, a grid support rod 21 and a permanent magnet 22, and screw fixing holes are formed in the direct current electromagnet fixing frame 16, the limit baffle 20, the grid support rod 21 and the permanent magnet 22. The grid curtain executing mechanism is used for realizing automatic switching between two states of human body monitoring and heat source scanning under the drive of the driving circuit.

The grid curtain stay bar is used for receiving a human body moving target signal under the maximum induction angle in a human body monitoring state, and the grid curtain slit forming the minimum induction angle in a heat source scanning state is used for detecting the heat source infrared radiation quantity of each angle. The grid support rod is made of nonferrous metal (such as aluminum alloy), a round permanent magnet is fixed at the root of the grid support rod through four screw fixing holes, the surface area of the round permanent magnet is one to the surface area of the direct current electromagnet, the other two screw fixing holes are used for fixedly connecting the grid support rod with the second hinge, and the grid 23 arranged below the grid support rod is made of black paper.

The limiting baffle is used for limiting the rotation angle of the grid curtain stay bar by taking the second hinge as the axis. The limit baffle is made of nonferrous metal (such as aluminum alloy), and two screw fixing holes are used for fixedly connecting the limit baffle with the first hinge.

The direct-current electromagnet is used for generating attraction force or thrust to drive the grid curtain stay bars to rotate to form two states. When the flowing direct current electromagnet is in one direction, the generated magnetic pole is opposite to the magnetic pole of the permanent magnet, and the direct current electromagnet attracts the grid support rod with the permanent magnet to rotate to the position of the direct current magnet, namely the position of the heat source scanning state; conversely, when the flowing direct current electromagnet is in the other direction, the generated magnetic pole is the same as the magnetic pole of the permanent magnet, and the direct current electromagnet pushes the grid support rod with the permanent magnet to rotate to the position of the limit baffle, namely the position of the human body monitoring state; the direct current electromagnet is fixed on the direct current electromagnet fixing frame, the direct current electromagnet fixing frame is made of nonferrous metal (such as aluminum alloy), the direct current electromagnet is fixed through four screw fixing holes, and the other two screw fixing holes are used for fixedly connecting the direct current electromagnet fixing frame with the third hinge. The first hinge, the second hinge and the third hinge are connected through coaxial cylindrical lamination.

The hinge is used for connecting the three parts of the direct current electromagnet fixing frame, the limiting baffle and the grid curtain supporting rod into a whole. The first hinge is coaxial with the third hinge and is fixed on the box body of the infrared detector, the limit baffle plate on the first hinge and the direct current electromagnet fixed frame on the third hinge form a grid rotation angle, the grid rotation angle is related to the induction angle of the infrared detector, and the grid rotation angle=90-the maximum induction angle/2.

The stepper motor is a 28BYJ48 type stepper motor driven by a driver ULN 2003. When the step driver ULN2003 receives the pulse signal sent by the controller, the step motor control circuit drives the step motor to drive the infrared detector to rotate forward or backward by a corresponding angle according to the set step direction, and the angular displacement of the step motor is controlled by controlling the number of the output pulses through the controller, so that the purpose of directionally collecting the infrared radiation data of all angles is achieved. The 0-degree position identification circuit of the stepping motor consists of an LED lamp on the middle line of the infrared detector and a photoresistor in a gap at the 0-degree position on the middle line of the box body. Only when the stepping motor drives the center line of the infrared controller to rotate to be coincident with the center line of the box body, the light of the LED can be received by the photoresistor on the circuit board of the box body, so that the 0-degree position identification is realized; and the LED lamp on the mid-line of the infrared detector is a 0-degree position lamp.

The voice circuit adopts an ISD1700 voice chip. The chip contains the omnibearing integrated system functions of automatic gain control, microphone preamplifier, loudspeaker driving circuit, oscillator and memory, etc. The chip adopts the direct storage analog signal technology, and can permanently store the voice alarm signal which is recorded in advance. And when the automatic sectional broadcasting is performed, under the control of the controller, the periodical sectional broadcasting is automatically performed according to the dangerous degree of the fixed heat source in the unmanned state in the kitchen. The external loudspeaker is connected with a loudspeaker driving circuit in the voice circuit and is used for being externally connected to rooms such as a living room outside a kitchen, so that a user can conveniently hear voice alarm at any time and timely handle dangerous situations in the kitchen.

The controller adopts an STC15F2K60S2 singlechip. Besides the chip has large capacity, high speed and wide working voltage, the STC15F2K60S2 singlechip is mainly provided with a large capacity on-chip EEPROM (FLASH) inside, and can be used for storing the infrared radiation data of each angle at present and the infrared radiation data of each angle in advance, and storing the voice playing period, the accumulated time of unmanned fires in a kitchen and the like according to the infrared data of a fixed heat source; the high-speed 8-channel 10-bit ADC arranged inside can be used for directly collecting infrared radiation data of the infrared detector at different angles under a heat source scanning state and the like.

The key circuit is arranged at the bottom end of the box body. The monitoring device is provided with two keys, one is a power switch key of the device, and the other is a self-checking key; the state indication is respectively represented by three LED lamps as three working states of heat source scanning, human body monitoring and system self-checking. Pressing a power switch key, and powering up the device; if the monitoring reminding device needs to be checked to judge whether the operation is normal, the self-checking button is pressed, at the moment, the system self-checking lamp is on, the device firstly enters a human body monitoring state, when the infrared receiver receives a mobile human body signal and can identify, the corresponding human body monitoring lamp is on, otherwise, the human body monitoring lamp is shiny, and the state is fault; the device automatically enters a heat source scanning state after the detection of a human body monitoring state, the direct current electromagnet is attracted to drive the grid screen to be closed, the stepping motor performs scanning motion, when the infrared receiver receives a fixed heat source signal and can perform azimuth identification, the corresponding heat source scanning lamp is on, otherwise, the heat source scanning lamp is shiny, and the state is indicated to have faults.

The switch power supply module is used for generating +5V and +12V power supplies, and the +5V power supplies power to a stepping motor control circuit, a stepping motor 0-degree position identification circuit, a status indicator lamp, a language circuit and the stepping motor of the controller in the box body; the +12V power supply supplies power to the infrared detector through an external signal power line.

In this embodiment, the infrared detector is retrofitted with the basic principle of detecting a fixed heat source by rotation of the infrared detector. The infrared detector is integrally arranged on a rotating shaft of the stepping motor above the box body, so that the infrared detector can rotate from 0 degree (namely, at the middle position) to +90 degrees (namely, can rotate to 90 degrees right) and-90 degrees (namely, can rotate to 90 degrees left), and heat source radiation signal data are fixed at all angles in a kitchen and are scanned and stored.

When in engineering installation, the box body is hung on the wall surface of a kitchen. The installation position is opposite to sunlight, the visual field is wide, the distance is high, the specific position depends on the site of the kitchen entrance, and the kitchen entrance is arranged on the left side facing the device.

The operation schematic diagram of the heat source scanning state of the infrared detector is shown in fig. 6, the operation schematic diagram of the human body monitoring state of the infrared detector is shown in fig. 7, the operation schematic diagram of the human body monitoring state identification moving human body entering mode of the infrared detector is shown in fig. 8, and the operation schematic diagram of the human body walking mode of the infrared detector is shown in fig. 9. The infrared detector consists of a 0-degree position LED lamp, a driving circuit, a binary pyroelectric infrared sensor, a filter amplifier, a grid curtain executing mechanism and a columnar Fresnel lens. Wherein the binary pyroelectric infrared sensor 24 is located at the focal point of the cylindrical fresnel lens 13 so as to collect the infrared light radiated from the target on the sensor; the width of the grid gap 27 is the width of a 'dark zone' added between two 'bright zones', so as to ensure that the infrared radiant energy of the heat source in the corresponding angle, namely the induction angle 14, is effectively received by the sensor when the heat source is scanned; the controller controls the direct current electromagnet 15 on the grid executing mechanism through the driving circuit, and simultaneously cooperates with the first hinge 17, the second hinge 18 and the limit baffle 20 to realize opening and closing operations of the first grid 25 and the second grid 26. In fig. 8, the arrow direction is the direction of human body ingress from the kitchen doorway; in fig. 9, the arrow direction is the direction in which the human body walks out of the kitchen doorway.

In this embodiment, a reminding method of an intelligent kitchen fixed heat source monitoring reminding device includes the following steps:

s1, starting up and initializing; when no person enters the kitchen and all the fixed heat sources in the kitchen are closed, the power ammonium key of the device is pressed, and the system firstly performs the measurement of the initialization data;

s11, entering a human body monitoring state; the controller of the device firstly sends a control instruction to a driving circuit in the infrared detector, drives the grid executing mechanism to generate driving force, namely, the direct current electromagnet generates magnetic poles with the same polarity as that of the permanent magnet on the grid supporting rod, and pushes the two grids to the position of the limiting baffle plate, so that the first grid and the second grid are both opened, the infrared detector is at the 0-degree position, and the device is in a human body monitoring state; the working schematic diagram of the human body monitoring state of the infrared detector is shown in fig. 7;

s12, collecting an initial comparison value V of the human body monitoring state _n The method comprises the steps of carrying out a first treatment on the surface of the The controller controls the stepping motor to return to the 0 degree position after stepping by 1 degree and 18Hz of stepping pulse frequency and +5 degrees, and simultaneously stores the infrared data value V measured by the infrared detector in the state _n The initial comparison value which is used as the initial comparison value for identifying that no person exists in the kitchen and no fixed heat source is started is stored in a data memory of the controller; the infrared data value V _n Namely, the initial comparison value V of the human body monitoring state _n ；

S2, recognizing that a mobile human body target enters a kitchen; after the startup initialization is completed, the system is switched into a human body monitoring state; when a person enters a kitchen, the binary pyroelectric infrared sensor filters and amplifies a received pulse signal of infrared radiation of a moving human body, then sends the pulse signal to the controller for signal processing, and after the fact that a moving human body target exists in a human body induction angle is judged, the controller of the device sends a control instruction to a driving circuit in the infrared detector to drive the direct current electromagnet to generate a magnetic pole with polarity different from that of a permanent magnet on a grid support rod, and the second grid is attracted to the position of a direct current electromagnet fixing frame, namely, the second grid is closed, and the first grid is kept open unchanged, so that the induction angle is halved. The operation schematic diagram of the infrared detector in the human body monitoring state recognition mobile human body entering mode is shown in fig. 8. If the human body target can still be monitored, the device indicates that the human body enters the kitchen, the device does not alarm the heat source, otherwise, the device returns to the human body monitoring state as the human body does not enter the kitchen for treatment.

S3, recognizing that a mobile human body target leaves the kitchen; after the human body is confirmed to enter the kitchen, the controller of the device sends a control instruction to the driving circuit in the infrared detector, and the process of the step S2 is opposite to that of the first grid to the position of the direct current electromagnet fixing frame, namely, the first grid is closed, and the second grid is kept open unchanged, so that the induction angle is halved. The operation schematic diagram of the infrared detector in the human body monitoring state for identifying the human body running-out mode is shown in fig. 9. If a human body target is monitored, the mobile human body is indicated to leave the kitchen, otherwise, the mobile human body is treated as a person in the kitchen, and the mobile human body returns to a human body monitoring state.

s42, infrared radiation current value v in human body monitoring state induction angle _n Is obtained and compared; the controller controls the stepping motor to return to the 0 degree position after stepping by 1 degree and 18Hz of stepping pulse frequency and +5 degrees, and simultaneously stores the infrared data value v measured by the infrared detector in the state _n And compared with an initial comparison value V which has been stored in the data memory and which is unoccupied in the kitchen without any fixed heat source being turned on _n Comparing, if v _n >V _n Indicating that no person exists in the kitchen, turning on a fixed heat source, entering the next step of identification, otherwise, judging that no person exists in the kitchen, turning on any fixed heat source, and returning to the step S2;

s43, collecting heat source data of 0-90 degrees in a heat source scanning state; the controller controls the stepping motor to jump back to the 0-degree position after stepping by +90 degrees at the stepping angle of 1-18 Hz and the stepping pulse frequency, and simultaneously, the infrared data value a measured by the infrared detector at each 1-degree in the state is obtained ₊₁ ，…a _+i …a ₊₈₉ ,a ₊₉₀ Stored in a data memory of the controller;

s45, collecting heat source data of 0-90 degrees in a heat source scanning state; in the same way as in step S43, the controller further controls the stepper motor to have a step angle of 1 DEG and a step pulse frequency of 18Hz, stepping by-90 degrees, then jumping back to 0 degree position, and measuring infrared data value a of the infrared detector at each 1 degree in the state _-1 ，…a _-i …a _-89 ,a _-90 Stored in a data memory of the controller;

s47, comparing infrared radiation data of the fixed heat sources at all angles; infrared data value a of heat source actually measured at each angle _i Initial comparison value A with fixed Heat Source _i Comparison, if a _i >A _i Indicating that there is a fixed heat source at the angle i, otherwise, returning to step S4 to measure a _i And for each group of data a _i Comparing the values with the upper group, wherein the value rise indicates that the heat source temperature rises, otherwise, the heat source temperature falls; the large value indicates that the temperature of the heat source is high, the heat source is continuously detected for N times, when the angle value is higher than a set value, the angle is stored, the next step is carried out, otherwise, when all the angle data is lower than the set value, no one or any fixed heat source is started in the kitchen, and the step S6 is carried out;

s48, identifying a static human body in the kitchen; continuously detecting a for N times _i Comparing the values with the upper group, when a _i The value is suddenly changed to be less than or equal to A at a certain moment _i The angle i is kept unchanged, which indicates that a static human body exists at the angle i, and the infrared radiation data of the human body is mutated and reduced after the human body leaves, so that the human body is treated by people in a kitchen; otherwise, the next step is carried out.

S5, identifying the heat source danger degree and automatically giving an alarm by voice; when the fire on the fixed heat source in the induction angle is big fire, the infrared radiation quantity is big, the collected infrared data is big, and the detection is continuously carried out for N times a _i When the number value of (2) exceeds the set maximum value, the controller automatically accelerates the playing of the voice circuit for a set time period, and when the set playing time is up, the controller controls the voice circuit to be connected to a loudspeaker outside a kitchen through a lead wire at a loudspeaker interface to emit' you have a fire on the kitchen is on, the fire is larger, you leave the kitchen for XX minutes, pleaseNote safety "; when the furnace fire is small fire, the infrared radiation quantity is small, the collected infrared data is small, and the continuous detection is carried out for N times a _i When the number value of (1) exceeds the set minimum value, the controller automatically lengthens the playing set time period of the voice circuit, and when the set playing time is reached, the controller controls the voice circuit to send out a 'fire in a kitchen is open, the fire is small, the user leaves the kitchen for XX minutes, and the user notices safety' through a loudspeaker connected to the outside of the kitchen through a lead wire at a loudspeaker interface; when the fire is middle fire, the infrared radiation amount is medium, the collected infrared data is between the intermediate values, and the a is continuously detected for N times _i When the numerical value of (1) exceeds a set intermediate value, the controller automatically plays the voice circuit for a set time period to be moderate, and when the set play time is reached, the controller controls the voice circuit to send out that a loudspeaker connected to the outside of a kitchen through a lead wire at a loudspeaker interface is on, the fire is a middle fire, and the fire leaves the kitchen for XX minutes, and the safety is noted;

s6, re-acquisition and updating of initialization data; when step S4 determines that no person is in the kitchen and no fixed heat source is on, the initial comparison value will change due to uncertainty of the current environment, including sunlight infrared radiation, temperature difference between day and night, and opening and closing of kitchen windows, and re-measurement is needed, and the method is the same as step S1, wherein the initial comparison value V of the human body monitoring state is obtained by re-measurement _n And the initial comparison value A of the fixed heat source at each angle in the heat source scanning state _i Covering the original value, providing initialization data for the next recognition, and entering the next step;

In this embodiment, as shown in fig. 10, the software program flow chart includes the following steps:

1. program initialization

The method mainly carries out initial configuration of internal resources of the controller, including reset sources, clocks, serial ports, AD, external memories, voltage references, ports, crystal oscillators, interrupts and the like, and aims to prepare for normal operation of the controller.

2. Searching for the position of the starting point 0 DEG of the motor

The main function is to find the 0 degree boundary of the stepping motor as the starting point for acquiring the infrared radiation data in the induction angle area of the infrared detector by the program when the stepping motor rotates reciprocally in the range of 18 degrees/s plus or minus 90 degrees.

3. Collecting dynamic initialization comparison data

The method mainly collects environmental data in two states in an induction angle area of the outer detector under dynamic state.

The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the protection scope of the present invention is subject to the claims.

Claims

1. The intelligent kitchen fixed heat source monitoring and reminding device is characterized by comprising a controller, a stepping motor control circuit, an infrared detector, a stepping motor 0-degree position identification circuit, a status indicator lamp, keys and a voice circuit, wherein the stepping motor control circuit, the infrared detector, the stepping motor 0-degree position identification circuit, the status indicator lamp, the keys and the voice circuit are connected with the controller; the stepping motor control circuit is connected with a stepping motor; the infrared detector is used for completing the monitoring of a mobile human body and the detection of the infrared radiation quantity of all fixed heat sources in a kitchen and comprises a driving circuit, a binary pyroelectric infrared sensor, a filter amplifier, a grid executing mechanism and a Fresnel lens, wherein the filter amplifier is connected with a controller, the binary pyroelectric infrared sensor is connected with the filter amplifier, the Fresnel lens is arranged at the front end of the binary pyroelectric infrared sensor, the driving circuit is connected with the controller, and the grid executing mechanism is connected with the driving circuit; the driving circuit is used for generating forward and reverse direct current to flow through the direct current electromagnet under the control of the controller; the grid curtain executing mechanism is used for realizing automatic switching of two states of human body monitoring and heat source scanning under the drive of the driving circuit; the dual pyroelectric infrared sensor is used for identifying a moving heat source; the Fresnel lens is used for gathering infrared rays radiated by a target to a binary pyroelectric infrared sensor positioned at a lens focus, the binary pyroelectric infrared sensor is used for identifying a moving heat source, and the filter amplifier is used for filtering and amplifying weak pulse signals output by the binary pyroelectric infrared sensor;

The Fresnel lens gathers infrared light rays radiated by a target to a binary pyroelectric infrared sensor positioned at a lens focus through a concentric circle narrow band on a mirror surface of the Fresnel lens, and divides an induction angle into an interval 'bright area' and an interval 'dark area', and when a human body moves to the induction angle, generated continuous light pulses are radiated to the binary pyroelectric infrared sensor;

the grid curtain actuating mechanism comprises a direct current electromagnet, a direct current electromagnet fixing frame, a permanent magnet, a limiting baffle, a grid curtain supporting rod and three hinges, wherein the three hinges are coaxially connected in a cylindrical lamination manner; the direct-current electromagnet is arranged in the direct-current electromagnet fixing frame; the permanent magnet is fixed at the root of the grid support rod; the lower part of the grid support rod is used for installing a grid; the grid curtain stay bar is made of nonferrous metal, a round permanent magnet is fixed at the root of the grid curtain stay bar through four screw fixing holes, the surface area of the round permanent magnet is consistent with that of a direct current electromagnet, the other two screw fixing holes are used for fixedly connecting the grid curtain stay bar with a second hinge, and a grid curtain installed below the grid curtain stay bar is made of black paper so as to lighten the weight of the grid curtain.

2. The intelligent kitchen fixed heat source monitoring and reminding device according to claim 1, wherein the model of the filter amplifier is BIS0001; the stepper motor is a 28BYJ48 type stepper motor driven by a driver ULN 2003; the voice circuit adopts an ISD1700 voice chip; the controller adopts an STC15F2K60S2 singlechip.

3. The intelligent kitchen fixed heat source monitoring and reminding device according to claim 1, wherein the controller, the voice circuit and the stepping motor 0 degree position identification circuit are arranged in a shell, and the status indicator lamp and the keys are arranged on a front panel of the shell; the infrared detector is connected to a stepping motor in the shell through a stepping motor rotating shaft.

4. The intelligent kitchen fixed heat source monitoring and reminding device according to claim 3, wherein the stepping motor 0-degree position identification circuit consists of an LED lamp on a middle line of an infrared detector and a photoresistor in a 0-degree position gap on the middle line of a box body; the LED lamp on the mid-line of the infrared detector is a 0-degree position lamp;

5. The intelligent kitchen fixed heat source monitoring and reminding device according to claim 1, further comprising a power supply for supplying power to the monitoring and reminding device, wherein the power supply is realized by a switch power supply module and is used for generating +5V and +12V power supplies, and the +5V power supplies power to a stepping motor control circuit, a stepping motor 0-degree position identification circuit, a status indicator lamp, a voice circuit and the stepping motor of the controller in the box body; the +12V power supply supplies power to the infrared detector through an external signal power line.

6. The method for monitoring a stationary heat source monitoring reminder for an intelligent kitchen according to any one of claims 1 to 5, comprising the steps of:

s5, identifying the heat source danger degree and automatically giving an alarm by voice; when the fire on the fixed heat source in the induction angle is big fire,the infrared radiation quantity is large, the collected infrared data is large, and the detection is continuously carried out for N times a _i When the numerical value of (1) exceeds the set maximum value, the controller automatically quickens the playing set time period of the voice circuit, and when the set playing time is reached, the controller controls the voice circuit to send out that the horn connected to the outside of the kitchen through the lead wire at the horn interface is open, the fire is larger, the fire leaves the kitchen for XX minutes, and the safety is noted; when the furnace fire is small fire, the infrared radiation quantity is small, the collected infrared data is small, and the continuous detection is carried out for N times a _i When the number value of (1) exceeds the set minimum value, the controller automatically lengthens the playing set time period of the voice circuit, and when the set playing time is reached, the controller controls the voice circuit to send out a 'fire in a kitchen is open, the fire is small, the user leaves the kitchen for XX minutes, and the user notices safety' through a loudspeaker connected to the outside of the kitchen through a lead wire at a loudspeaker interface; when the fire is middle fire, the infrared radiation amount is medium, the collected infrared data is between the intermediate values, and the infrared data value a is continuously detected for N times _i When the numerical value of (1) exceeds a set intermediate value, the controller automatically plays the voice circuit for a set time period to be moderate, and when the set play time is reached, the controller controls the voice circuit to send out that a loudspeaker connected to the outside of a kitchen through a lead wire at a loudspeaker interface is on, the fire is a middle fire, and the fire leaves the kitchen for XX minutes, and the safety is noted;

7. The method of claim 6, wherein in step S1, the measuring of the initialization data comprises the steps of:

S14, collecting initial comparison value A of fixed heat source at each angle in heat source scanning state _i The method comprises the steps of carrying out a first treatment on the surface of the The controller controls the stepping motor to jump back to the 0-degree position after stepping by +90 degrees at the stepping angle of 1-degree and the stepping pulse frequency of 18Hz, and simultaneously stores the infrared data value A measured by the infrared detector at every 1-degree in the state ₊₁ ，… A _+i …A ₊₈₉ ,A ₊₉₀ In a data memory of the controller; similarly, scanning from 0 deg. to-90 deg. and storing the infrared data value A measured by the infrared detector every 1 deg. in this state _-1 ，…A _-i …A _-89 ,A _-90 In a data memory of the controller; the infrared data value A _i I.e. the initial comparison value A of the fixed heat source _i 。

8. The method for monitoring the intelligent kitchen fixed heat source monitoring reminding device according to claim 6, wherein in step S4, the step of identifying whether the fixed heat source is turned on in an unmanned state in the kitchen comprises the following steps:

s43, collecting heat source data of 0-90 degrees in a heat source scanning state; the controller controls the stepping motor to jump back to the 0-degree position after stepping by +90 degrees at the stepping angle of 1-18 Hz and the stepping pulse frequency, and simultaneously, the infrared data value a measured by the infrared detector at each 1-degree in the state is obtained ₊₁ ，… a _+i …a ₊₈₉ ,a ₊₉₀ Stored in a data memory of the controller;

s47, comparing infrared radiation data of the fixed heat sources at all angles; infrared data value a of heat source actually measured at each angle _i Initial comparison value A with fixed Heat Source _i Comparison, if a _i > A _i Indicating that there is a fixed heat source at the angle i, otherwise, returning to step S4 to measure a _i And for each group of data a _i Comparing the values with the upper group, wherein the value rise indicates that the heat source temperature rises, otherwise, the heat source temperature falls; the numerical value is large, the heat source temperature is high, the detection is continuously carried out for N times, when the numerical value of the angle is higher than a set value, the angle is stored, the next step is carried out, otherwise, when all the angle data are lower than the set value, no person is judged to be in the kitchen, no fixed heat source is started, and the step S6 is carried out;

s48, identifying a static human body in the kitchen; continuously detecting a for N times _i Comparing the values with the upper group, when a _i Numerical value is mutated to be less than or equal toA _i The infrared radiation data of the human body is mutated and reduced after the human body leaves and is treated by people in a kitchen; otherwise, the next step is carried out.