CN204044572U - A kind of speed-controlling device that tests the speed based on high-building intelligent escape device - Google Patents
A kind of speed-controlling device that tests the speed based on high-building intelligent escape device Download PDFInfo
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- CN204044572U CN204044572U CN201420505687.XU CN201420505687U CN204044572U CN 204044572 U CN204044572 U CN 204044572U CN 201420505687 U CN201420505687 U CN 201420505687U CN 204044572 U CN204044572 U CN 204044572U
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Abstract
The utility model provides a kind of speed-controlling device that tests the speed based on high-building intelligent escape device, its Hall element is attached on escaping device for high-rise building wheel disc, when escaping device for high-rise building runs, voltage signal is produced when this Hall element detects that field signal inputs, and this voltage signal is transferred to Hall element signal input circuit, this Hall element signal input circuit compare this Hall element export voltage signal and a predetermined voltage signals obtain a pulse signal, and by this pulse signal transmission to single-chip minimum system, single-chip minimum system is according to this pulse signal, calculate the travelling speed of escaping device for high-rise building, this single-chip minimum system is by control step motor-drive circuit, rotating and reverse of control step motor.This speed-controlling device that tests the speed can adjust automatically according to different users, possess independently return function, towards being civilianly easy to promote, advantage that security performance is good.
Description
Technical field
The utility model relates to escaping device for high-rise building, particularly relates to a kind of speed-controlling device that tests the speed based on high-building intelligent escape device.
Background technology
Along with the continuous quickening of urban construction paces, increasing high-rise residential building, office building, mall etc. appear at national each big and medium-sized cities.In building, the safety problem of personnel has become our unavoidable problem.The escape of tradition building in danger uses self-control rope and the most universal the easiest in fire of high-rise building, play what act on be high-altitude slow-falling device.
According to the existing descending lifeline of analysis, there is following deficiency: (1) cannot realize the Based Intelligent Control of decline rate, and security is poor.(2) function independently returned is not possessed, a people can only be met to escape needs, can not back and forth use, current only minority has the descending lifeline returning function also to be needed to carry out manual operation aloft and returns, service efficiency and rescue efficiency lowly, cannot adapt to the use under many people's needs evacuation situation; (3) complex structure, manufacturing cost is high, can not promote towards family or personal user.We have invented a kind of speed-controlling device that tests the speed based on high-building intelligent escape device newly for this reason, solve above technical matters.
Summary of the invention
The purpose of this utility model be to provide a kind of speed automatically can adjust according to different users, possess independently return function, towards being civilianly easy to promote, the speed-controlling device that tests the speed based on high-building intelligent escape device that security performance is good.
The purpose of this utility model realizes by following technical measures:
Based on the speed-controlling device that tests the speed of high-building intelligent escape device, Hall element should be comprised based on the speed-controlling device that tests the speed of high-building intelligent escape device, stepper motor and control circuit board, this control circuit board comprises Hall element signal input circuit, stepper motor driving circuit and single-chip minimum system, this Hall element is connected to this control circuit board, be attached on escaping device for high-rise building wheel disc, when escaping device for high-rise building runs, voltage signal is produced when this Hall element detects that field signal inputs, and this voltage signal is transferred to this Hall element signal input circuit, this Hall element signal input circuit is connected to this Hall element, the voltage signal and the predetermined voltage signals that compare the output of this Hall element obtain a pulse signal, and give this single-chip minimum system by this pulse signal transmission, this single-chip minimum system is connected to this Hall element signal input circuit and this stepper motor driving circuit, and according to this pulse signal, calculate the travelling speed of escaping device for high-rise building, this stepper motor driving circuit is connected to this stepper motor, this single-chip minimum system is by controlling this stepper motor driving circuit, control rotating and reverse of this stepper motor.
The purpose of this utility model also realizes by following technical measures:
This Hall element signal input circuit comprises potentiometer, voltage comparator, LED and row's pin, the first input end of this voltage comparator is connected to the output terminal of this Hall element, second input end of this voltage device is connected to the output terminal of this potentiometer, the output signal of voltage signal and this potentiometer that this voltage comparator compares the output of this Hall element is to obtain this pulse signal, this LED is connected to supply voltage and is somebody's turn to do between the output terminal of voltage comparator, and when the voltage signal of the output of this Hall element is greater than the output signal of this potentiometer, this LED is bright, one pin of this row's pin is connected to the output terminal of this voltage comparator, to give this single-chip minimum system by this pulse signal transmission.
Display screen and display screen display circuit should be also comprised based on the speed-controlling device that tests the speed of high-building intelligent escape device, this display screen is connected to this display screen display circuit, this display screen display circuit is positioned at this control circuit board, and be connected to this single-chip minimum system, the travelling speed of this escaping device for high-rise building is transferred to this display screen display circuit by this single-chip minimum system, with the travelling speed making this display screen show this escaping device for high-rise building.
This display screen is LCD1602 liquid crystal display, and this display screen display circuit comprises potentiometer, with the contrast regulating this display screen to show.
When the travelling speed of this escaping device for high-rise building is not more than the safe decline rate of setting in advance, this stepper motor does not work, when the travelling speed of this escaping device for high-rise building is greater than the safe decline rate of setting in advance, this single-chip minimum system transmission reverse control signal gives this stepper motor driving circuit, reverses to make this stepper motor.
This stepper motor driving circuit comprises big current Darlington ULN2003, first row pin and second row pin, this single-chip minimum system is connected to the input end of this big current Darlington ULN2003 by this first row pin, and this stepper motor is connected to the output terminal of this big current Darlington ULN2003 by this second row pin.
This single-chip minimum system comprises STC89C52 single-chip microcomputer, crystal oscillating circuit and reset circuit, this crystal oscillating circuit is connected to this STC89C52 single-chip microcomputer, for producing the clock frequency needed for this STC89C52 single-chip microcomputer in conjunction with this STC89C52 single-chip microcomputer internal circuit, this reset circuit is connected to this STC89C52 single-chip microcomputer, for by this STC89C52 monolithic processor resetting.
12V accumulator and DC-DC module should be also comprised based on the speed-controlling device that tests the speed of high-building intelligent escape device, this DC-DC module is connected to this 12V accumulator and this control circuit board, and the DC voltage of the 12V provided by this 12V accumulator is converted to 5V voltage, for this control circuit board is powered.
Also direct current generator should be comprised based on the speed-controlling device that tests the speed of high-building intelligent escape device, this direct current generator wiring is connected to this 12V accumulator, by this 12V storage battery power supply, this direct current generator is by switch control rule, after opening switch, this direct current generator rotates, to drive escaping device for high-rise building wire spool to reverse, escaping device for high-rise building is gone up to initial position, uses to provide next escape personnel.
The computing formula of the travelling speed of this escaping device for high-rise building is:
V＝4*π*π*R1*R2/t
Wherein R1 is that magnet installs radius, and R2 is the peripheral mean radius of wiring, and t is the mistiming between two pulses of this pulse signal.
The speed-controlling device that tests the speed based on high-building intelligent escape device in the utility model, decline rate at that time can be measured according to the Hall current sensor that escaping device for high-rise building adheres to, computing through single-chip microcomputer shows corresponding decline rate in LED charactron, make it compared with prior setting speed, and control step motor compresses escape device brake handle to realize the effect of Braking mode, motor reversal can be utilized after a people completes escape to drive escape device to go up for the next man's use, achieve the advantage of recycling.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the utility model embodiment;
Fig. 2 is the system circuit diagram of the single-chip microcomputer in Fig. 1;
Fig. 3 is the circuit diagram of Hall element in Fig. 1 and Hall element signal input circuit;
Fig. 4 is the stepper motor driving circuit figure in Fig. 1;
Fig. 5 is the circuit diagram of display screen in Fig. 1 and display screen display circuit.
Embodiment
For other objects, the feature and advantage that make the utility model above-mentioned can become apparent, cited below particularly go out preferred embodiment, and coordinate institute's accompanying drawings, be described in detail below.
As shown in Figure 1, the structural drawing of the speed-controlling device that tests the speed based on high-building intelligent escape device of the present utility model.Hall element 2, display screen 3, stepper motor 4, direct current generator 7,12V accumulator 5, DC-DC module 6 and control circuit board 1 should be comprised based on the speed-controlling device that tests the speed of high-building intelligent escape device, control circuit board 1 is made up of peripheral control circuits, single-chip minimum system 14, and peripheral control circuits is by Hall element signal input circuit 1111, display screen display circuit 12 and stepper motor driving circuit 13.Hall element 2, display screen 3, stepper motor 4 access single-chip minimum system 14 after accessing Hall element signal input circuit 1111, display screen display circuit 12, stepper motor driving circuit 13 respectively, are controlled by single-chip minimum system 14.12V accumulator 5 is powered directly to direct current generator 7, and is converted to 5V voltage by DC-DC module 6, and for control circuit board 1 is powered, wherein DC-DC module 6 adopts the modular circuit that market has existed.
Hall element 2 is connected to control circuit board 1, be attached on escape device wheel disc, when escaping device for high-rise building starts to run downwards, produce voltage signal when Hall element 2 detects that field signal inputs, and this voltage signal is transferred to Hall element signal input circuit 11.
Hall element signal input circuit 11 is connected to Hall element 2, and the output signal of the voltage signal and potentiometer that compare Hall element 2 output obtains a pulse signal, and pulse signal is inputted single-chip minimum system 14.
Hall element signal input circuit 11 comprises potentiometer, voltage comparator, LED and row's pin.The first input end of this voltage comparator is connected to the output terminal of this Hall element 2, second input end of voltage comparator is connected to the output terminal of potentiometer, the output signal of its voltage signal and potentiometer of comparing Hall element 2 output is to obtain a pulse signal, led is connected between supply voltage and the output terminal of voltage comparator, and when the output signal of Hall element 2 is greater than the output signal of potentiometer, LED lamp is bright.One pin of row's pin is connected to the output terminal of voltage comparator, with by this pulse signal transmission to single-chip microcomputer.
As shown in Figure 3, in Hall element signal input circuit, the pin 1 of Hall element 3144 accesses supply voltage VCC, pin 2 accesses power supply ground GND, pin 3 accesses 3 pins (+end) of voltage comparator U1A, potentiometer RP2 mono-tunnel access supply voltage VCC, one access power supply ground, tunnel GND, 2 pins (-end) of another road access voltage comparator, the pin 8 one tunnel access supply voltage VCC of voltage comparator, another road contact resistance R2, the pin 2 of access row pin J3 after LED1, the pin 4 of voltage comparator accesses power supply ground GND, power supply ground GND is accessed on pin 1 one tunnel after connecting electric capacity C4, the pin 2 of another road access J3, the pin 1 of J3 accesses supply voltage VCC, pin 3 accesses power supply ground GND, the pin 2 of J3 is the signal output part of circuit, be connected to the pin P3.3 of single-chip microcomputer.By regulator potentiometer RP2, change the sensitivity of Hall element 2, when making Hall element magnetic field be detected, its pin 3 output voltage values is greater than the output voltage values of potentiometer RP2, compared by voltage comparator U1A, pin 1 output low level of output voltage comparer U1A, now LED1 lamp is bright, otherwise output high level, LED1 lamp is dark.
Display screen 3 is connected to control circuit board 1, and under the control of control circuit board 1, the travelling speed of display escaping device for high-rise building.In one embodiment, display screen 3 is LCD1602 liquid crystal display.LCD1602 liquid crystal display is industrial character mode lcd, 16x02 i.e. 32 characters (16 row 2 row) can be shown simultaneously, the character generator of its inside has stored 160 different dot character figures, these characters have: the capital and small letter of arabic numeral, English alphabet, conventional symbol etc., and each character has a fixing code.Due to LCD1602 identification is ASCII character, can use ASCII character indirect assignment, in mcu programming, and also available characters constant or variable assignments.
Display screen display circuit 12 is connected to display screen 3, for transmitting display data, provides power supply, provides backlight, regulates contrast.
As shown in Figure 5, display screen display circuit comprises potentiometer, the contrast shown for regulating display screen, data is shown more clear.The pin VSS of LCD1602 liquid crystal display accesses power supply ground GND, pin VCC accesses supply voltage VCC, pin V0 accesses power supply ground GND after connecting potentiometer RP1, pin RS is connected to single-chip microcomputer pin P2.4, pin R/W is connected to single-chip microcomputer P2.5, and pin E is connected to single-chip microcomputer P2.6, and pin DB0-DB7 is connected to single-chip microcomputer P0.0-P0.7, pin BLA accesses supply voltage VCC, and pin BLK accesses power supply ground GND.When opening master switch, system power-on reset, Single Chip Microcomputer (SCM) program initialization, by character constant assignment, makes LCD1602 display screen show speed=0.0m/s.
Stepper motor 4 is connected to control circuit board 1, and under the control of control circuit board 1, carry out motor to rotate and reverse, when decline rate is not more than the safe decline rate of setting in advance, stepper motor 4 does not work, when decline rate is greater than the safe decline rate of setting in advance, stepper motor 4 rotates forward and drives high-rise building escape device hydraulic braking handle to slow down, thus control device decline rate is stable.
Stepper motor driving circuit 13 is connected to stepper motor 4, and single-chip minimum system 14 is by controlling this stepper motor driving circuit 13, rotating and reverse of control step motor 4.
Stepper motor driving circuit 13 comprises big current Darlington ULN2003, row pin J1 and row's pin J2.Single Chip Microcomputer (SCM) system is connected to the input end of big current Darlington ULN2003 by row's pin J1, and stepper motor is connected to the output terminal of big current Darlington ULN2003 by row's pin J2.
As shown in Figure 4, described stepper motor driving circuit is withstand voltage by height, big current Darlington ICULN2003 forms, its pin COM1 accesses power supply ground GND, pin COM2 accesses supply voltage VCC, pin 2,3,4,5 is connected respectively to single-chip microcomputer P1.1, P1.2, P1.3, P1.4, J1, J2 are row's pin, and the pin 1 of J2 accesses supply voltage VCC.
In described stepper motor driving circuit, OUT2-OUT5 pin is connected to the connector socket of stepper motor, controls motor rotate and reverse by the level of the OUT2-OUT5 pin of control ULN2003 chip.Represent high level with 1,0 represents low level, and when the state of OUT2-OUT5 pin is following order: 0111,0011,1011,1001,1101,1100,1110,0110, stepper motor rotates forward; When the state of OUT2-OUT5 pin is following order: 0110,1110,1100,1101,1001,1011,0011,0111, stepper motor reverses.When decline rate is greater than the safe decline rate of setting in advance, stepper motor rotates forward and drives high-rise building escape device hydraulic braking handle to slow down, thus control device decline rate is stable.During this period, LCD1602 display screen real-time displaying device decline rate, blinking red lamp, the speed of the frequency reflection device decline rate of blinking red lamp.
Direct current generator 7 wiring is connected to the both positive and negative polarity of 12V accumulator 5.Direct current generator 7, by switch control rule, is opened switch rear motor and is rotated, and is with the rotation of moving-wire wheel to carry out reversion coiling, when reversion coiling, Hall element still can respond to generation pulse signal, and sends into single-chip minimum system 14 and calculate speed reversal, is output in display screen 3.Now, need not carry out Braking mode due to during the coiling of line wheel, stepper motor 4 does not work.When after people's safe landing, open motor switch, direct current generator 7 rotates and drives the reversion of high-rise building escape device wire spool, escape device is gone up to initial position, uses to provide next escape personnel.
Single-chip minimum system 14 is connected to Hall element signal input circuit 11, display screen display circuit 12, stepper motor driving circuit 13, the pulse signal that single-chip minimum system 14 provides according to Hall element signal input circuit 11, calculate the travelling speed of escaping device for high-rise building, and the travelling speed of this escaping device for high-rise building is transferred to display screen display circuit 12, to be shown by display screen 3.When decline rate is not more than the safe decline rate of setting in advance, stepper motor 4 does not work, when decline rate is greater than the safe decline rate of setting in advance, single-chip minimum system 14 transmits reverse control signal to stepper motor driving circuit 13, reverses to make stepper motor 4.Direct current generator 7 is controlled by switch, does not control by single-chip minimum system 14.
When escaping device for high-rise building starts to run downwards, the Hall current sensor be attached on escape device wheel disc detects has field signal to input, the signal output part of the Hall element circuit now shown in Fig. 2 becomes low level from high level, obtain corresponding pulse thus, by the mistiming between formulae discovery two pulses, obtain auto levelizer decline rate
V＝4*π*π*R1*R2/t
Wherein R1 is that magnet installs radius, and R2 is the peripheral mean radius of wiring, and t is the mistiming that Hall current sensor detects between two pulses.Magnet is arranged in the line wheel position corresponding with Hall element, to ensure that line wheel often turns around magnet and Hall element near to provide pulse signal, during wiring is wound around and takes turns online.
Be illustrated in figure 2 governor circuit figure of the present utility model, single-chip minimum system is made up of STC89C52 single-chip microcomputer, crystal oscillating circuit and reset circuit.Crystal oscillating circuit is connected to single-chip microcomputer, for producing the clock frequency needed for single-chip microcomputer in conjunction with single-chip microcomputer internal circuit.Reset circuit is connected to single-chip microcomputer, for by monolithic processor resetting.
STC89C52 is a kind of low-power consumption, high-performance CMOS 8 8-digit microcontroller of STC Corporation's production, has 8K in-system programmable components flash storage.On a single chip, 8 dexterous bit CPUs and in-system programmable components Flash is had.STC89C52 chip be numbered U1, in crystal oscillating circuit, pin XTAL1 mono-tunnel connects ground connection after electric capacity C3, accesses a road of pin XTAL2 after another road of pin XTAL1 connects crystal oscillator X1, and another road of pin XTAL2 connects ground connection after electric capacity C2.In reset circuit, ground connection after the contact resistance R1 of pin RST mono-road, supply voltage VCC is accessed after connecting electric capacity C1 in another road of pin RST, is connected between supply voltage VCC with power supply ground GND with button.
12V accumulator 5 is connected to direct current generator 7 and DC-DC module 6, one tunnel is used for providing 12V DC voltage to direct current generator 7, the 12V DC voltage that battery provides by one route DC-DC module 6 converts 5V DC voltage to, and this DC voltage is that the control circuit board 1 of single-chip microcomputer is powered.
Claims (10)
1. the speed-controlling device that tests the speed based on high-building intelligent escape device, it is characterized in that, Hall element should be comprised based on the speed-controlling device that tests the speed of high-building intelligent escape device, stepper motor and control circuit board, this control circuit board comprises Hall element signal input circuit, stepper motor driving circuit and single-chip minimum system, this Hall element is connected to this control circuit board, be attached on escaping device for high-rise building wheel disc, when escaping device for high-rise building runs, voltage signal is produced when this Hall element detects that field signal inputs, and this voltage signal is transferred to this Hall element signal input circuit, this Hall element signal input circuit is connected to this Hall element, the voltage signal and the predetermined voltage signals that compare the output of this Hall element obtain a pulse signal, and give this single-chip minimum system by this pulse signal transmission, this single-chip minimum system is connected to this Hall element signal input circuit and this stepper motor driving circuit, and according to this pulse signal, calculate the travelling speed of escaping device for high-rise building, this stepper motor driving circuit is connected to this stepper motor, this single-chip minimum system is by controlling this stepper motor driving circuit, control rotating and reverse of this stepper motor.
2. a kind of speed-controlling device that tests the speed based on high-building intelligent escape device according to claim 1, it is characterized in that, this Hall element signal input circuit comprises potentiometer, voltage comparator, LED and row's pin, the first input end of this voltage comparator is connected to the output terminal of this Hall element, second input end of this voltage device is connected to the output terminal of this potentiometer, the output signal of voltage signal and this potentiometer that this voltage comparator compares the output of this Hall element is to obtain this pulse signal, this LED is connected to supply voltage and is somebody's turn to do between the output terminal of voltage comparator, and when the voltage signal of the output of this Hall element is greater than the output signal of this potentiometer, this LED is bright, one pin of this row's pin is connected to the output terminal of this voltage comparator, to give this single-chip minimum system by this pulse signal transmission.
3. a kind of speed-controlling device that tests the speed based on high-building intelligent escape device according to claim 1, it is characterized in that, display screen and display screen display circuit should be also comprised based on the speed-controlling device that tests the speed of high-building intelligent escape device, this display screen is connected to this display screen display circuit, this display screen display circuit is positioned at this control circuit board, and be connected to this single-chip minimum system, the travelling speed of this escaping device for high-rise building is transferred to this display screen display circuit by this single-chip minimum system, with the travelling speed making this display screen show this escaping device for high-rise building.
4. a kind of speed-controlling device that tests the speed based on high-building intelligent escape device according to claim 3, it is characterized in that, this display screen is LCD1602 liquid crystal display, and this display screen display circuit comprises potentiometer, with the contrast regulating this display screen to show.
5. a kind of speed-controlling device that tests the speed based on high-building intelligent escape device according to claim 1, it is characterized in that, when the travelling speed of this escaping device for high-rise building is not more than the safe decline rate of setting in advance, this stepper motor does not work, when the travelling speed of this escaping device for high-rise building is greater than the safe decline rate of setting in advance, this single-chip minimum system transmission reverse control signal gives this stepper motor driving circuit, reverses to make this stepper motor.
6. a kind of speed-controlling device that tests the speed based on high-building intelligent escape device according to claim 1, it is characterized in that, this stepper motor driving circuit comprises big current Darlington ULN2003, first row pin and second row pin, this single-chip minimum system is connected to the input end of this big current Darlington ULN2003 by this first row pin, and this stepper motor is connected to the output terminal of this big current Darlington ULN2003 by this second row pin.
7. a kind of speed-controlling device that tests the speed based on high-building intelligent escape device according to claim 1, it is characterized in that, this single-chip minimum system comprises STC89C52 single-chip microcomputer, crystal oscillating circuit and reset circuit, this crystal oscillating circuit is connected to this STC89C52 single-chip microcomputer, for producing the clock frequency needed for this STC89C52 single-chip microcomputer in conjunction with this STC89C52 single-chip microcomputer internal circuit, this reset circuit is connected to this STC89C52 single-chip microcomputer, for by this STC89C52 monolithic processor resetting.
8. a kind of speed-controlling device that tests the speed based on high-building intelligent escape device according to claim 1, it is characterized in that, 12V accumulator and DC-DC module should be also comprised based on the speed-controlling device that tests the speed of high-building intelligent escape device, this DC-DC module is connected to this 12V accumulator and this control circuit board, and the DC voltage of the 12V provided by this 12V accumulator is converted to 5V voltage, for this control circuit board is powered.
9. a kind of speed-controlling device that tests the speed based on high-building intelligent escape device according to claim 8, it is characterized in that, also direct current generator should be comprised based on the speed-controlling device that tests the speed of high-building intelligent escape device, this direct current generator wiring is connected to this 12V accumulator, by this 12V storage battery power supply, this direct current generator is by switch control rule, after opening switch, this direct current generator rotates, reverse to drive escaping device for high-rise building wire spool, escaping device for high-rise building is gone up to initial position, uses to provide next escape personnel.
10. a kind of speed-controlling device that tests the speed based on high-building intelligent escape device according to claim 1, it is characterized in that, the computing formula of the travelling speed of this escaping device for high-rise building is:
V＝4*π*π*R1*R2/t
Wherein R1 is that magnet installs radius, and R2 is the peripheral mean radius of wiring, and t is the mistiming between two pulses of this pulse signal.
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| CN201420505687.XU CN204044572U (en) | 2014-09-03 | 2014-09-03 | A kind of speed-controlling device that tests the speed based on high-building intelligent escape device |
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| CN201420505687.XU CN204044572U (en) | 2014-09-03 | 2014-09-03 | A kind of speed-controlling device that tests the speed based on high-building intelligent escape device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105467888A (en) * | 2014-09-03 | 2016-04-06 | 王子龙 | Velocity-measurement velocity-control apparatus based on high-rise building intelligent escape device |
| CN105989704A (en) * | 2015-02-15 | 2016-10-05 | 上海卜珑智能科技有限公司 | Apparatus for realizing intelligent data measurement through sensor and Bluetooth communication mode |
| CN115218579A (en) * | 2022-07-20 | 2022-10-21 | 海信家电集团股份有限公司 | Refrigerator and door opening control method thereof |
-
2014
- 2014-09-03 CN CN201420505687.XU patent/CN204044572U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105467888A (en) * | 2014-09-03 | 2016-04-06 | 王子龙 | Velocity-measurement velocity-control apparatus based on high-rise building intelligent escape device |
| CN105989704A (en) * | 2015-02-15 | 2016-10-05 | 上海卜珑智能科技有限公司 | Apparatus for realizing intelligent data measurement through sensor and Bluetooth communication mode |
| CN115218579A (en) * | 2022-07-20 | 2022-10-21 | 海信家电集团股份有限公司 | Refrigerator and door opening control method thereof |
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Granted publication date: 20141224 Termination date: 20150903 |
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