CN209879290U - Intelligent energy-saving system for elevator - Google Patents
Intelligent energy-saving system for elevator Download PDFInfo
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- CN209879290U CN209879290U CN201920441522.3U CN201920441522U CN209879290U CN 209879290 U CN209879290 U CN 209879290U CN 201920441522 U CN201920441522 U CN 201920441522U CN 209879290 U CN209879290 U CN 209879290U
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Abstract
The utility model discloses an elevator intelligence economizer system, include: the device comprises a main control module, a timer, a pressure sensor, a plurality of detection modules, a resistor R1, a triode Q1, a diode D1, a relay K1 and a transmission lead; the detection module comprises a sub-controller, an ultrasonic transmitting circuit, an ultrasonic receiving circuit and an infrared detection circuit, wherein the ultrasonic transmitting circuit, the ultrasonic receiving circuit and the infrared detection circuit are all electrically connected with the sub-controller; the transmission lead comprises a trunk line and a branch line, one end of the branch line is connected with the sub-controller, the other end of the branch line is collected into the trunk line, and the trunk line is electrically connected with the main control module; the utility model discloses do not take the demand of elevator before detecting every layer of elevator outer door to and detect in the elevator nobody, host system control elevator stops the function, avoids the elevator to be in standby state for a long time, is favorable to the energy saving, and it is long when the use of extension elevator.
Description
Technical Field
The utility model relates to an elevator intelligent control technical field more relates to an elevator intelligence economizer system.
Background
With the rapid development of national economy and the improvement of the living standard of people, the house and land industry shows a situation of high-speed development, the elevator is widely applied as a vertical transportation tool in a building, and the elevator is developed towards the elevator intellectualization direction more and more.
Few people take the elevator late at night, the elevator is in a standby state for a long time, and the electric energy consumed by the elevator in the standby state is usually ignored by people. In some cases the elevator runs for a short time and the elevator is in standby mode consuming even more power than when the elevator is running. Some elevators stop operating late at night, which also causes inconvenience for users.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the elevator is standby for a long time at night and consumes large electric energy.
The utility model provides a reduce elevator intelligence economizer system of elevator standby consumption night.
The utility model provides a solution of its technical problem is: an elevator intelligent energy saving system, comprising: the device comprises a main control module, a timer, a pressure sensor, a plurality of detection modules, a resistor R1, a triode Q1, a diode D1, a relay K1 and a transmission lead;
the detection module comprises a sub-controller, an ultrasonic transmitting circuit, an ultrasonic receiving circuit and an infrared detection circuit, wherein the ultrasonic transmitting circuit, the ultrasonic receiving circuit and the infrared detection circuit are all electrically connected with the sub-controller;
the transmission lead comprises a trunk line and a branch line, one end of the branch line is connected with the sub-controller, the other end of the branch line is collected into the trunk line, and the trunk line is electrically connected with the main control module;
the timer and the pressure sensor are respectively and electrically connected with the main control module;
one end of the resistor R1 is electrically connected with the output end of the main control module, the other end of the resistor R1 is connected with the base of the three-pole terminal Q1, the collector of the triode Q1 is respectively connected with the anode of the diode D1, one end of the coil of the relay K1 is connected, the emitter of the triode Q1 is grounded, the other end of the coil of the relay K1 and the cathode of the diode D1 are respectively connected with a power supply VCC, one contact of the switch of the relay K1 is connected with an elevator controller, and the other contact of the switch of the relay K1 is connected with the power supply end;
the detection modules are respectively arranged above the outer doors of the elevators at all layers and used for detecting whether people exist in front of the outer doors of the elevators, and the pressure sensor is arranged at the bottom of the elevator and used for detecting pressure numerical value information at the bottom of the elevator.
Further, the ultrasonic wave transmission circuit includes: operational amplifiers A1, A2 and A3, an ultrasonic vibration piece, resistors R2, R3, R4, R5 and R5, wherein one end of the ultrasonic vibration piece is respectively connected with the output end of the operational amplifier A5, one ends of the resistors R5 and R5 are respectively connected, the other end of the ultrasonic vibration piece is respectively connected with the output end of the operational amplifier A5, one end of the resistor R5 is connected, the other ends of the resistors R5 and R5 are respectively connected with a power supply VCC, the other end of the resistor R5 is respectively connected with the inverting input end of the operational amplifier A5 and one end of the resistor R5, the other end of the resistor R5 is grounded, one end of the resistor R5 is connected with the non-inverting input end of the operational amplifier A5, the other end of the resistor R5 is respectively connected with one end of the resistors R5, one end of the R5 and the inverting input end of the operational amplifier A5, the other end of the resistor R3 is connected with the inverting input end of the operational amplifier A3, the other end of the resistor R9 is grounded, and the non-inverting input ends of the operational amplifiers A1 and A3 are connected with the first output end of the sub-controller.
Further, the ultrasonic wave receiving circuit includes: operational amplifiers A4, A5 and A6, resistors R10, R11, R12, R13, R14, R15 and R16, an acoustic-electric sensor and a capacitor C1; one end of the acoustoelectric sensor is respectively connected with a non-inverting input end of an operational amplifier A4 and one end of a capacitor C1, the other end of the acoustoelectric sensor is respectively connected with a non-inverting input end of an operational amplifier A5 and the other end of a capacitor C1, an inverting input end of an operational amplifier A4 is respectively connected with one ends of resistors R10 and R12, an output end of an operational amplifier A4 is respectively connected with the other end of a resistor R12 and one end of a resistor 14, the other end of a resistor R14 is respectively connected with one end of a resistor R16 and an inverting input end of an operational amplifier A6, the other end of a resistor R16 is connected with an output end of an operational amplifier A6, a non-inverting input end of an operational amplifier A6 is respectively connected with one ends of resistors R13 and R15, the other end of a resistor R15 is grounded, the other end of a resistor R13 is respectively connected with one end of a resistor R11 and an output end, the other end of the resistor R10 is connected, and the output end of the operational amplifier A6 is connected with the first input end of the sub-controller.
Further, the infrared detection circuit includes: a resistor R17, a triode Q2, an infrared emission tube D2, an infrared receiving tube U1 and a capacitor C2, wherein the second output end of a terminal controller of the resistor R17 is connected, the other end of the resistor 17 is connected with the base of the triode Q2, the collector of the triode Q2 is connected with a power supply VCC, the emitter of the triode Q2 is connected with the positive electrode of the infrared emission tube D2, the negative electrode of the infrared emission tube D2 is grounded, the output end of the infrared receiving tube U1 is connected with the second input end of the terminal controller, the ground end of the infrared receiving tube U1 is grounded, the power supply end of the infrared receiving tube U1 is connected with the power supply VCC, the positive electrode of the capacitor C2 is connected with the power supply end of the infrared receiving tube U1, and the negative electrode of the capacitor C2 is.
The voice monitoring system further comprises a voice sensor, a first wireless transmission module, a second wireless transmission module and a control terminal, wherein the voice sensor and the first wireless transmission module are respectively electrically connected with the main control module, the second wireless transmission module is electrically connected with the control terminal, and the first wireless transmission module is in wireless communication connection with the second wireless transmission module.
Further, the main control module and the sub-controllers are single-chip microcomputers, and the single-chip microcomputers are STM32F103RCT 6.
The utility model has the advantages that: the utility model discloses detect the demand that all does not take the elevator before every layer of elevator outer door to and when detecting not having the man-hour in the elevator, master control module control elevator stops the function, avoids the elevator to be in standby state for a long time, is favorable to the energy saving, and is long when the use of extension elevator.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.
FIG. 1 is a schematic diagram of the connection of the entire module according to the present embodiment;
fig. 2 is a schematic circuit connection diagram of the detection module in this embodiment.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention. In addition, all the connection relations mentioned herein do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.
Embodiment 1, referring to fig. 1 to 2, an elevator intelligent energy saving system includes: the device comprises a main control module 100, a timer 200, a pressure sensor 300, a plurality of detection modules 400, a resistor R1, a triode Q1, a diode D1, a relay K1 and a transmission lead;
the detection module 400 comprises a sub-controller 410, an ultrasonic wave transmitting circuit 420, an ultrasonic wave receiving circuit 430 and an infrared detection circuit 440, wherein the ultrasonic wave transmitting circuit 420, the ultrasonic wave receiving circuit 430 and the infrared detection circuit 440 are all electrically connected with the sub-controller 410;
the transmission lead comprises a trunk line and a branch line, one end of the branch line is connected with the sub-controller 410, the other end of the branch line is converged into the trunk line, and the trunk line is electrically connected with the main control module 100;
the timer 200 and the pressure sensor 300 are respectively electrically connected with the main control module 100;
one end of the resistor R1 is electrically connected with the output end of the main control module 100, the other end of the resistor R1 is connected with the base of the three-pole terminal Q1, the collector of the triode Q1 is respectively connected with the anode of the diode D1, one end of the coil of the relay K1 is connected, the emitter of the triode Q1 is grounded, the other end of the coil of the relay K1 and the cathode of the diode D1 are respectively connected with a power supply VCC, one contact of the switch of the relay K1 is connected with an elevator controller, and the other contact of the switch of the relay K1 is connected with the power supply end;
the plurality of detection modules 400 are arranged above the outer doors of the elevators at all floors and used for detecting whether people are in front of the outer doors of the elevators, and the pressure sensor 300 is arranged at the bottom of the elevators and used for detecting pressure numerical value information at the bottom of the elevators.
Preferably, the ultrasonic wave transmitting circuit 420 includes: operational amplifiers a1, a2 and A3, an ultrasonic wave vibration reed 421, a resistor R2, R3, R4, R5 and R5, wherein one end of the ultrasonic wave vibration reed 421 is connected to an output terminal of the operational amplifier a5, one ends of the resistor R5 and the resistor R5 are connected, the other end of the ultrasonic wave vibration reed 421 is connected to an output terminal of the operational amplifier a5 and one end of the resistor R5 are connected to a non-inverting input terminal of the operational amplifier a5, the other ends of the resistors R5 and R5 are connected to a power source VCC, the other end of the resistor R5 is connected to an inverting input terminal of the operational amplifier a5 and one end of the resistor R5, the other end of the resistor R5 is connected to an inverting input terminal of the resistors R5 and R5, the other end of the resistor R5 is connected to an inverting input terminal of the operational amplifier a5 and the inverting input terminal of the operational amplifier a5, the other end of the resistor R3 is connected to the inverting input terminal of the operational amplifier A3, the other end of the resistor R9 is grounded, and the non-inverting input terminals of the operational amplifiers a1 and A3 are connected to the first output terminal P1 of the sub-controller 410.
Preferably, the ultrasonic wave receiving circuit 430 includes: operational amplifiers A4, A5 and A6, resistors R10, R11, R12, R13, R14, R15 and R16, an acoustic-electric sensor 431 and a capacitor C1; one end of the acoustoelectric sensor 431 is respectively connected with a non-inverting input end of an operational amplifier A4 and one end of a capacitor C1, the other end of the acoustoelectric sensor 431 is respectively connected with a non-inverting input end of an operational amplifier A5 and the other end of a capacitor C1, an inverting input end of an operational amplifier A4 is respectively connected with one ends of resistors R10 and R12, an output end of an operational amplifier A4 is respectively connected with the other end of a resistor R12 and one end of a resistor 14, the other end of the resistor R14 is respectively connected with one end of a resistor R16 and an inverting input end of an operational amplifier A6, the other end of the resistor R16 is connected with an output end of an operational amplifier A6, a non-inverting input end of an operational amplifier A6 is respectively connected with one ends of resistors R13 and R15, the other end of a resistor R15 is grounded, the other end of a resistor R13 is respectively connected with one end of a resistor R11 and an output end, the other end of the resistor R10 is connected and the output of the operational amplifier a6 is connected to a first input P2 of the sub-controller 410.
Preferably, the infrared detection circuit 440 includes: a resistor R17, a triode Q2, an infrared emission tube D2, an infrared receiving tube U1 and a capacitor C2, wherein one end of the resistor R17 is connected with a second output end P3 of the sub-controller 410, the other end of the resistor 17 is connected with a base electrode of the triode Q2, a collector electrode of the triode Q2 is connected with a power supply VCC, an emitter electrode of the triode Q2 is connected with an anode electrode of the infrared emission tube D2, a cathode electrode of the infrared emission tube D2 is grounded, an output end of the infrared receiving tube U1 is connected with a second input end P4 of the sub-controller 410, a ground end of the infrared receiving tube U1 is grounded, a power supply end VCC of the infrared receiving tube U1 is connected, an anode electrode of the capacitor C2 is connected with a power supply end of the infrared receiving tube U1, and a cathode electrode of the capacitor C.
For optimization, the main control module 100 and the sub-controllers 410 are single-chip microcomputers, and the model of each single-chip microcomputer is STM32F103RCT 6.
The working principle of the embodiment is as follows:
a time period is preset by the timer 200, and in the present embodiment, the preset time period is 1: 00-5: 00, and relatively few people take the elevator in a short time. The timer 200 sends interruption information to the main control module 100 every night, after the main control module 100 receives the interruption information, the main control module 100 drives the pressure sensor 300 and the detection modules 400 to start, the pressure sensor 300 is used for detecting the pressure value at the bottom of the elevator, the infrared detection circuit 440 in the detection modules 400 is used for detecting the infrared signal of the movement of a person in front of the elevator outer door, so as to judge whether the person is in front of the elevator outer door, and the ultrasonic wave transmitting circuit 420 and the ultrasonic wave receiving circuit 430 judge whether the person has the requirement of taking the elevator by measuring the distance between the person or an obstacle and the elevator outer door.
The detection surface of the infrared detection circuit 440 and the emission surface of the ultrasonic emission circuit 420 face the front of the elevator outer door.
The pressure value detected by the pressure sensor 300 is transmitted to the main control module 100 through the a/D conversion circuit.
When the pressure value detected by the pressure sensor 300 exceeds the preset pressure value, the pressure sensor 300 sends a low level signal to the main control module 100, and when the detected pressure value does not exceed the preset pressure value, the pressure sensor 300 sends a high level signal to the main control module 100.
The preset pressure value is adjustable, in this embodiment, the preset pressure value is 200N, and the pressure sensor 300 is mainly used for determining whether a person is in the elevator.
The infrared emission tube D2 and the infrared receiving tube U1 in the infrared detection circuit 440 constitute an infrared pair tube. When the infrared pair transistors of the infrared detection circuit 440 operate, the sub-controller 410 sends a pulse signal to the input terminal of the infrared detection circuit 440 through the output terminal P3, the infrared transmitting tube D2 sends out infrared rays, and when the infrared rays are blocked, the infrared receiving tube U1 outputs a low level signal to the input terminal P4 of the sub-controller 410; when the infrared ray is not blocked, the infrared ray receiving tube U1 outputs a high level signal to the input terminal P4 of the sub-controller 410.
The ultrasonic wave transmitting circuit 420 transmits ultrasonic waves, the ultrasonic waves are reflected after encountering an obstacle in the transmission process, and the ultrasonic wave receiving circuit 430 receives the reflected ultrasonic waves to obtain the distance between the obstacle or the obstacle and the outer door of the elevator. The ultrasonic wave receiving circuit 430 transmits a low level signal to the input terminal P2 of the sub-controller 410 when the distance of the person or the obstacle is less than a preset distance threshold, and the ultrasonic wave receiving circuit 430 transmits a high level signal to the input terminal P2 of the sub-controller 410 when the distance of the person or the obstacle is greater than the preset distance threshold.
In this embodiment, the preset distance threshold is 5 m.
When the sub-controller 410 receives the high level signal sent by the infrared detection circuit 440 and the ultrasonic wave receiving circuit 430 at the same time, it indicates that no person is in front of the elevator outer door within the preset distance threshold range detected by the infrared detection circuit 440 and the ultrasonic wave receiving circuit 430 at the same time, and the sub-controller 410 sends the high level signal to the main control module 100.
When the main control module 100 receives the high level signal sent by the pressure sensor 300 and the high level signal sent by any sub-controller 410 at the same time, the main control module 100 controls the relay K1 to disconnect the power supply of the elevator controller, so that the elevator stops operating.
When the infrared detection technology and the ultrasonic ranging technology simultaneously detect the requirement that the elevator is not taken in front of the outer door of each layer of elevator and the pressure sensor 300 detects that no person exists in the elevator, the main control module 100 controls the elevator to stop operating, so that the elevator is prevented from being in a standby state for a long time, energy conservation is facilitated, and the service life of the elevator is prolonged.
As an optimization, the system further comprises a sound sensor 500, a first wireless transmission module 600, a second wireless transmission module 700 and a control terminal 800, wherein the sound sensor 500 and the first wireless transmission module 600 are respectively electrically connected with the main control module 100, the second wireless transmission module 700 is electrically connected with the control terminal 800, and the first wireless transmission module 600 is in wireless communication connection with the second wireless transmission module 700.
When a preset time period is up, the timer 200 sends interruption information to the main control module 100, after receiving the interruption information, the main control module 100 drives the sound sensor 500 and the first wireless transmission module 600 to start, and the sound sensor 500 is arranged inside the elevator and used for detecting the sound inside the elevator. When the sound sensor 500 detects that the sound in the elevator exceeds 60 decibels, the sound sensor 500 sends a high level signal to the main control module 100, when the main control module 100 receives the high level signal, the main control module sends an early warning signal to the first wireless transmission module 600, and the first wireless transmission module 600 sends the early warning signal to the control terminal 800 through wireless communication with the second wireless transmission module 700. The control terminal 800 is disposed in a guard monitoring room, and the early warning signal received by the control terminal 800 is used to inform a guard person that an emergency situation may occur in the elevator.
The elevator is taken late at night, so that thieves or females are lewd possibly occurring in the elevator, timely alarming or seeking help cannot be realized, and by judging the sound, guard personnel can be reminded to pay attention to the movement of the elevator in time, and the emergency can be prevented in time.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the details of the embodiments shown, but is capable of various modifications and substitutions without departing from the spirit of the invention.
Claims (6)
1. The utility model provides an elevator intelligence economizer system which characterized in that: the method comprises the following steps: the device comprises a main control module, a timer, a pressure sensor, a plurality of detection modules, a resistor R1, a triode Q1, a diode D1, a relay K1 and a transmission lead;
the detection module comprises a sub-controller, an ultrasonic transmitting circuit, an ultrasonic receiving circuit and an infrared detection circuit, wherein the ultrasonic transmitting circuit, the ultrasonic receiving circuit and the infrared detection circuit are all electrically connected with the sub-controller;
the transmission lead comprises a trunk line and a branch line, one end of the branch line is connected with the sub-controller, the other end of the branch line is collected into the trunk line, and the trunk line is electrically connected with the main control module;
the timer and the pressure sensor are respectively and electrically connected with the main control module;
one end of the resistor R1 is electrically connected with the output end of the main control module, the other end of the resistor R1 is connected with the base of the three-pole terminal Q1, the collector of the triode Q1 is respectively connected with the anode of the diode D1, one end of the coil of the relay K1 is connected, the emitter of the triode Q1 is grounded, the other end of the coil of the relay K1 and the cathode of the diode D1 are respectively connected with a power supply VCC, one contact of the switch of the relay K1 is connected with an elevator controller, and the other contact of the switch of the relay K1 is connected with the power supply end;
the detection modules are respectively arranged above the outer doors of the elevators at all layers and used for detecting whether people exist in front of the outer doors of the elevators, and the pressure sensor is arranged at the bottom of the elevator and used for detecting pressure numerical value information at the bottom of the elevator.
2. The intelligent energy-saving system for the elevator according to claim 1, characterized in that: the ultrasonic wave transmitting circuit includes: operational amplifiers A1, A2 and A3, an ultrasonic vibration piece, resistors R2, R3, R4, R5 and R5, wherein one end of the ultrasonic vibration piece is respectively connected with the output end of the operational amplifier A5, one ends of the resistors R5 and R5 are respectively connected, the other end of the ultrasonic vibration piece is respectively connected with the output end of the operational amplifier A5, one end of the resistor R5 is connected, the other ends of the resistors R5 and R5 are respectively connected with a power supply VCC, the other end of the resistor R5 is respectively connected with the inverting input end of the operational amplifier A5 and one end of the resistor R5, the other end of the resistor R5 is grounded, one end of the resistor R5 is connected with the non-inverting input end of the operational amplifier A5, the other end of the resistor R5 is respectively connected with one end of the resistors R5, one end of the R5 and the inverting input end of the operational amplifier A5, the other end of the resistor R3 is connected with the inverting input end of the operational amplifier A3, the other end of the resistor R9 is grounded, and the non-inverting input ends of the operational amplifiers A1 and A3 are connected with the first output end of the sub-controller.
3. The intelligent energy-saving system for the elevator according to claim 1, characterized in that: the ultrasonic wave receiving circuit includes: operational amplifiers A4, A5 and A6, resistors R10, R11, R12, R13, R14, R15 and R16, an acoustic-electric sensor and a capacitor C1; one end of the acoustoelectric sensor is respectively connected with a non-inverting input end of an operational amplifier A4 and one end of a capacitor C1, the other end of the acoustoelectric sensor is respectively connected with a non-inverting input end of an operational amplifier A5 and the other end of a capacitor C1, an inverting input end of an operational amplifier A4 is respectively connected with one ends of resistors R10 and R12, an output end of an operational amplifier A4 is respectively connected with the other end of a resistor R12 and one end of a resistor 14, the other end of a resistor R14 is respectively connected with one end of a resistor R16 and an inverting input end of an operational amplifier A6, the other end of a resistor R16 is connected with an output end of an operational amplifier A6, a non-inverting input end of an operational amplifier A6 is respectively connected with one ends of resistors R13 and R15, the other end of a resistor R15 is grounded, the other end of a resistor R13 is respectively connected with one end of a resistor R11 and an output end, the other end of the resistor R10 is connected, and the output end of the operational amplifier A6 is connected with the first input end of the sub-controller.
4. The intelligent energy-saving system for the elevator according to claim 1, characterized in that: the infrared detection circuit includes: a resistor R17, a triode Q2, an infrared emission tube D2, an infrared receiving tube U1 and a capacitor C2, wherein one end of the resistor R17 is connected with the second output end of the sub-controller, the other end of the resistor 17 is connected with the base of the triode Q2, the collector of the triode Q2 is connected with a power VCC, the emitter of the triode Q2 is connected with the anode of the infrared emission tube D2, the cathode of the infrared emission tube D2 is grounded, the output end of the infrared receiving tube U1 is connected with the second input end of the sub-controller, the ground end of the infrared receiving tube U1 is grounded, the power end of the infrared receiving tube U1 is connected with the power VCC, the anode of the capacitor C2 is connected with the power end of the infrared receiving tube U1, and the cathode of the capacitor C2 is connected with the ground.
5. The intelligent energy-saving system for the elevator according to claim 1, characterized in that: the voice monitoring system is characterized by further comprising a voice sensor, a first wireless transmission module, a second wireless transmission module and a control terminal, wherein the voice sensor and the first wireless transmission module are respectively electrically connected with the main control module, the second wireless transmission module is electrically connected with the control terminal, and the first wireless transmission module is in wireless communication connection with the second wireless transmission module.
6. The intelligent energy-saving system for the elevator according to claim 1, characterized in that: the main control module and the sub-controllers are single-chip microcomputers, and the single-chip microcomputers are STM32F103RCT 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920441522.3U CN209879290U (en) | 2019-04-02 | 2019-04-02 | Intelligent energy-saving system for elevator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920441522.3U CN209879290U (en) | 2019-04-02 | 2019-04-02 | Intelligent energy-saving system for elevator |
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| CN209879290U true CN209879290U (en) | 2019-12-31 |
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| CN201920441522.3U Expired - Fee Related CN209879290U (en) | 2019-04-02 | 2019-04-02 | Intelligent energy-saving system for elevator |
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Granted publication date: 20191231 Termination date: 20210402 |