CN113148795A - Elevator abnormal operation alarm control system - Google Patents

Elevator abnormal operation alarm control system Download PDF

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Publication number
CN113148795A
CN113148795A CN202110070401.4A CN202110070401A CN113148795A CN 113148795 A CN113148795 A CN 113148795A CN 202110070401 A CN202110070401 A CN 202110070401A CN 113148795 A CN113148795 A CN 113148795A
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resistor
elevator
module
capacitor
diode
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CN113148795B (en
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王银辉
王要辉
杨六云
朱超辉
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Asia Fuji Elevator Co ltd
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Asia Fuji Elevator Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00Control systems of elevators in general
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B3/00Applications of devices for indicating or signalling operating conditions of elevators
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
    • B66B5/021Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions the abnormal operating conditions being independent of the system

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Indicating And Signalling Devices For Elevators (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)

Abstract

本发明公开了一种电梯异常运行报警控制系统,包括市电电源、降压整流滤波模块、发光模块、稳压模块、电梯工作模块、电梯控制模块、电梯故障报警模块,所述市电电源连接降压整流滤波模块、电梯工作模块,降压整流滤波模块连接发光模块,发光模块连接稳压模块,稳压模块连接电梯工作模块,电梯工作模块连接电梯控制模块,电梯控制模块连接电梯故障报警模块,与现有技术相比,本发明的有益效果是:本发明增加了自动报警装置,在检测到电梯的运行装置出现问题时,电梯出现移动或者开关门故障时,这时报警电路将会导通,发出响亮的声音,提醒电梯出现了故障。

Figure 202110070401

The invention discloses an elevator abnormal operation alarm control system, comprising a mains power supply, a step-down rectification filter module, a light-emitting module, a voltage regulator module, an elevator working module, an elevator control module, and an elevator fault alarm module. The mains power supply is connected to The step-down rectifier and filter module, the elevator working module, the step-down rectifier and filter module is connected to the light-emitting module, the light-emitting module is connected to the voltage-stabilizing module, the voltage-stabilizing module is connected to the elevator working module, the elevator working module is connected to the elevator control module, and the elevator control module is connected to the elevator fault alarm module Compared with the prior art, the beneficial effects of the present invention are: the present invention adds an automatic alarm device, when it is detected that there is a problem with the running device of the elevator, when the elevator moves or fails to open and close the door, the alarm circuit will lead to Through, a loud sound is issued to remind the elevator that there is a fault.

Figure 202110070401

Description

Elevator abnormal operation alarm control system
Technical Field
The invention relates to the field of elevators, in particular to an abnormal operation alarm control system for an elevator.
Background
According to statistics, more than ten thousand elevators are used in China at 34.6, and the elevators grow at the speed of about 5 to 6 ten thousand elevators every year. The elevator service has more than 100 years of history in China, but the rapid increase of the number of elevators in China occurs after the eighties of the twentieth century, and the technical level of the elevators in China is synchronous with the world at present. In 2002, in 5 months, the world natural heritage, namely the Shannan Zhang nationality Wuling Yuan scenic spot, is provided with an outdoor elevator which is called the highest in the world and a double-layer sightseeing elevator which is called the highest in the world. In 12 months, the Chinese Elevator edition department publishes a monthly calendar for the public welfare propaganda of the safe elevator taking and civilization taking in 2003, and introduces the knowledge of the safe elevator taking to people in the form of cartoons. By 2002, international elevators in China have been held for 5 years in 1996, 1997, 1998, 2000, and 2002. The exhibition exchanges elevator technology and market information of all countries in the world, and promotes the development of the elevator industry.
The elevator on the existing market often needs to be manually triggered to alarm device when the elevator breaks down, is not convenient enough, and is more convenient if the elevator can be changed into automatic.
Disclosure of Invention
The invention aims to provide an abnormal operation alarm control system of an elevator, which aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides an elevator abnormal operation alarm control system, includes mains supply, step-down rectification filter module, light emitting module, voltage stabilizing module, elevator work module, elevator control module, elevator trouble alarm module, mains supply connects step-down rectification filter module, elevator work module, and light emitting module is connected to step-down rectification filter module, and light emitting module connects voltage stabilizing module, and voltage stabilizing module connects elevator work module, and elevator control module connects elevator trouble alarm module.
As a still further scheme of the invention: the commercial power supply is composed of 220V alternating current, the voltage reduction rectification filtering module is composed of a transformer W, a rectifier T and a pi-type filter Y, the light emitting module is composed of a resistor R1, a capacitor C1, a resistor R2, a diode D1 and a resistor R4, the voltage stabilizing module is composed of a voltage stabilizer U1, a resistor R3 and a potentiometer RP1, the elevator working module is composed of a switch door, a switch S2 and a switch S1, and a mobile voltage VCC, the elevator control module is composed of an integrated circuit U2, a capacitor C2, a capacitor C3, a resistor R5, a resistor R6, a triode V1, a diode D2, a diode D3, a relay J1 and a relay J1, and the elevator fault alarm module is composed of a resistor R1, a MOS tube V1, a capacitor C1, a resistor R1 and a SPEAKER AKSPEER.
The input end of a transformer W is connected with a mains supply, one end of the output end of the transformer W is connected with a port 1 of a rectifier T, the other end of the output end of the transformer W is connected with a port 3 of the rectifier T, a port 2 of the rectifier T is connected with a port 2 of a pi-type filter Y, a port 4 of the rectifier T is connected with a port 1 of the pi-type filter Y, a port 3 of the pi-type filter Y is connected with a resistor R1, a capacitor C1 and a resistor R2, a port 4 of the pi-type filter Y is connected with the other end of a resistor R1 and the other end of a capacitor C1, the other end of a resistor R2 is connected with the anode of a diode D1 and the input end of a voltage stabilizer U1, the cathode of the diode D1 is connected with a resistor R4, the other end of the resistor R4 is grounded, the ground end of a voltage stabilizer U1 is connected with a resistor R3 and a potentiometer RP1, the other end of the potentiometer RP1 is grounded, the output end of the voltage stabilizer U1 is connected with the other end of the resistor R3 and the other end of the rectifier T3, A button.
The other end of the button is connected with a pin No. 4 of an integrated circuit U2, a pin No. 8 of an integrated circuit U2 and a resistor R6, the other end of a resistor R6 is connected with a pin No. 7 of an integrated circuit U2 and a resistor R5, the other end of a resistor R5 is connected with a pin No. 2 of an integrated circuit U2, a pin No. 6 of an integrated circuit U2 and a capacitor C3, the other end of the capacitor C3 is grounded, a pin No. 1 of the integrated circuit U3 is grounded, a pin No. 5 of the integrated circuit U3 is connected with the capacitor C3, the other end of the capacitor C3 is grounded, a pin No. 3 of the integrated circuit U3 is connected with the resistor R3, the relay J3, the cathode of a diode D3, the cathode of the diode D3, the G pole of a MOS tube V3, the other end of the relay J3 is grounded, the other end of the relay J3 is connected with the MOS tube S3, the D pole of the MOS transistor V2 is connected with a resistor R8, the other end of the resistor R8 is connected with the in-phase end of the resistor R9 and the in-phase end of an amplifier U3, the other end of the resistor R9 is grounded, the output end of the amplifier U3 is connected with a resistor R10, a resistor R11 and a loudspeaker SPEAKER, the other end of the resistor R10 is grounded, the other end of the loudspeaker SPEAKER is grounded, the other end of the resistor R11 is connected with the inverted end of a capacitor C4 and the amplifier U3, and the other end of the capacitor C4 is grounded.
As a still further scheme of the invention: the relay J1, the relay J2 and the relay J4 are time relays and are connected in a normally closed mode.
As a still further scheme of the invention: the diode D1 is a light emitting diode, and the diode D2 and the diode D3 are voltage stabilizing diodes.
As a still further scheme of the invention: the triode V1 and the triode V3 are photosensitive NPN triodes, and the MOS transistor V2 is a PMOS transistor.
As a still further scheme of the invention: when light emitted by the diode D1 irradiates bases of the phototriode V1 and the phototriode V3, bases of the phototriode V1 and the phototriode V3 are conducted; when the light emitted by the diode D1 does not irradiate the bases of the phototriode V1 and the phototriode V3, the bases of the phototriode V1 and the phototriode V3 are cut off.
As a still further scheme of the invention: the voltage stabilizer U1 is 78L 05.
As a still further scheme of the invention: the integrated circuit U2 model is a 555 timer.
As a still further scheme of the invention: the amplifier U3 is model AD 8606.
As a still further scheme of the invention: the capacitor C4 causes the amplifier U3 to output a square wave signal by discharging.
Compared with the prior art, the invention has the beneficial effects that: the automatic alarm device is added, when the running device of the elevator is detected to have a problem and the elevator has a fault of moving or opening and closing the door, the alarm circuit is conducted to make a loud sound to remind the elevator of the fault.
Drawings
Fig. 1 is a schematic diagram of an alarm control system for abnormal operation of an elevator.
Fig. 2 is a circuit diagram of an alarm control system for abnormal operation of an elevator.
Fig. 3 is a circuit diagram of the pi-type filter Y.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Example 1: please refer to fig. 1, an elevator abnormal operation alarm control system is used for providing a mains supply of a power supply, a voltage reduction rectification filter module for converting 220V alternating current into stable direct current, a light emitting module for a light emitting control circuit, a voltage stabilizing module for stabilizing output voltage, an elevator working module for normal operation of an elevator, an elevator control module for controlling operation of the elevator, and an elevator fault alarm module for alarming when the elevator is in fault, wherein the mains supply is connected with the voltage reduction rectification filter module and the elevator working module, the voltage reduction rectification filter module is connected with the light emitting module, the light emitting module is connected with the voltage stabilizing module, the voltage stabilizing module is connected with the elevator working module, the elevator working module is connected with the elevator control module, and the elevator control module is connected with the elevator fault alarm module.
The specific circuit is as shown in fig. 2, the commercial power supply is composed of 220V ac power, the buck rectification filter module is composed of a transformer W, a rectifier T and a pi-type filter Y, the light emitting module is composed of a resistor R1, a capacitor C1, a resistor R2, a diode D1 and a resistor R4, the voltage stabilizing module is composed of a voltage stabilizer U1, a resistor R3 and a potentiometer RP1, the elevator working module is composed of a switch gate, a switch S2, a switch S1, a mobile circuit and a voltage VCC, the elevator control module is composed of an integrated circuit U2, a capacitor C2, a capacitor C3, a resistor R5, a resistor R6, a triode V1, a diode D2, a diode D3, a relay J1 and a relay J2, and the elevator fault alarm module is composed of a resistor R7, a resistor R8, a resistor R9, a resistor R10, a MOS tube V2, a capacitor C4, a resistor R11 and a SPEAKER.
The input end of a transformer W is connected with a mains supply, one end of the output end of the transformer W is connected with a port 1 of a rectifier T, the other end of the output end of the transformer W is connected with a port 3 of the rectifier T, the rectifier T is composed of a bridge rectifier circuit and converts alternating current into direct current, a port 2 of the rectifier T is connected with a port 2 of a pi-type filter Y, a port 4 of the rectifier T is connected with the port 1 of the pi-type filter Y, the port 3 of the pi-type filter Y is connected with a resistor R1, a capacitor C1 and a resistor R2, the port 4 of the pi-type filter Y is connected with the other end of the resistor R1 and the other end of the capacitor C1, the other end of the resistor R2 is connected with the anode of a diode D1 and the input end of a voltage stabilizer U1, the cathode of the diode D1 is connected with a resistor R4, the diode D1 is a light-emitting diode, emitted light irradiates the base of a triode V1, and the triode V1, the triode V1, The triode V3 is conducted, the other end of the resistor R4 is grounded, the grounding end of the voltage stabilizer U1 is connected with the resistor R3 and the potentiometer RP1, the other end of the potentiometer RP1 is grounded, and the output end of the voltage stabilizer U1 is connected with the other end of the resistor R3 and the button.
The other end of the button is connected with a pin No. 4 of an integrated circuit U2, a pin No. 8 of an integrated circuit U2 and a resistor R6, the other end of a resistor R6 is connected with a pin No. 7 of an integrated circuit U2 and a resistor R5, the other end of a resistor R5 is connected with a pin No. 2 of an integrated circuit U2, a pin No. 6 of an integrated circuit U2 and a capacitor C3, the other end of the capacitor C3 is grounded, a pin No. 1 of the integrated circuit U3 is grounded, a pin No. 5 of the integrated circuit U3 is connected with the capacitor C3, the other end of the capacitor C3 is grounded, a pin No. 3 of the integrated circuit U3 is connected with the resistor R3, the relay J3, the cathode of a diode D3, the cathode of the diode D3, the G pole of a MOS tube V3, the other end of the relay J3 is grounded, the other end of the relay J3 is connected with the MOS tube S3, the D pole of the MOS tube V2 is connected with a resistor R8, the other end of a resistor R8 is connected with a resistor R9 and the in-phase end of an amplifier U3, the other end of a resistor R9 is grounded, the output end of an amplifier U3 is connected with a resistor R10, a resistor R11 and a loudspeaker SPEAKER, the other end of a resistor R10 is grounded, the other end of the loudspeaker SPEAKER is grounded, the other end of the resistor R11 is connected with a capacitor C4 and the inverting end of the amplifier U3, the other end of the capacitor C4 is grounded, a relay J1 and a relay J2 are time relays, the time relay J1 works for a period of time, the switch S1 is opened, the time relay is closed in a reciprocating mode, the time relay does not work, the switch S1 is closed, the time relay J2 works for a period of time, the switch S2 is opened, the reciprocating switch is opened, the time relay J2 does not work, the switch S2 is closed, the relay J4 is a time relay, the relay J4 works for a period of time, the time relay J4 works, the switch is opened, and the switch door is opened in the interior of the switch, When the power switches at two positions are moved and the relay J4 does not work, the power to the switch door and the moving power supply are conducted, and the operation is repeated.
The working principle of the invention is as follows: the circuit is conducted to supply power to a voltage stabilizer U1 (78L 05) through voltage reduction, rectification and filtering, a voltage stabilizer U1 outputs stable direct current, when a person presses a button, a pin 4 and a pin 8 of an integrated circuit U2 (555 timer) are electrified, the integrated circuit U2 is conducted, a relay J1 and a relay J2 work, after a period of time, a switch S1 and a switch S2 are disconnected, a door is opened, the elevator stops moving, people enter the elevator, when the person passes through the elevator, illumination of a diode D1 is blocked, at the moment, a triode V1 and a triode V3 are disconnected, even if a closed circuit of the switch S1 and the switch S2 is still not conducted, the people enter the elevator, after the people enter the elevator, no person enters the elevator for a period of time, normal elevator door closing time is a short period when the relays J1 and the relay J4 are simultaneously conducted, the relays J1 and J4 work, and the elevator runs, when the elevator door is closed, the voltage output to the integrated circuit U2 by the button is disconnected, the relay J3 stops working, and the elevator runs normally; when the elevator has a fault, a button is pressed down, the relay J4 works, the relay J1 and the relay J2 do not work, the elevator stops at a certain floor, the MO2 tube V2 is conducted, square wave signals are output through the amplifier U3 (AD 8606), the SPEAKER SPEAKER is made to sound, and the fact that the conduction has the fault is reminded.
In embodiment 2, based on embodiment 1, fig. 3 is a circuit diagram of a pi-type filter Y, an unstable direct current (in the same direction and different sizes) output by a rectifier T is converted into a stable direct current through a capacitor CX1, a capacitor CX2 and an inductor LX, and the capacitor CX1, the capacitor CX2 and the inductor LX discharge electric energy to achieve the purpose of outputting the stable direct current.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (9)

1. An elevator abnormal operation alarm control system comprises a mains supply, a voltage reduction rectification filter module, a light emitting module, a voltage stabilization module, an elevator working module, an elevator control module and an elevator fault alarm module, and is characterized in that the mains supply is connected with the voltage reduction rectification filter module and the elevator working module, the voltage reduction rectification filter module is connected with the light emitting module, the light emitting module is connected with the voltage stabilization module, the voltage stabilization module is connected with the elevator working module, the elevator working module is connected with the elevator control module, the elevator control module is connected with the elevator fault alarm module, the mains supply is composed of 220V alternating current, the voltage reduction rectification filter module is composed of a transformer W, a rectifier T and a pi-shaped filter Y, the light emitting module is composed of a resistor R1, a capacitor C1, a resistor R2, a diode D1 and a resistor R4, the voltage stabilization module is composed of a voltage stabilizer U1, a resistor R3 and a potentiometer RP1, the elevator fault alarm system comprises an elevator working module, an elevator control module, a power supply module and a power supply module, wherein the elevator working module consists of a switch door, a switch S2, a switch S1, a mobile circuit and a voltage VCC, the elevator control module consists of an integrated circuit U2, a capacitor C2, a capacitor C3, a resistor R5, a resistor R6, a triode V1, a diode D2, a diode D3, a relay J1 and a relay J2, and the elevator fault alarm module consists of a resistor R7, a resistor R8, a resistor R9, a resistor R10, a MOS (metal oxide semiconductor) tube V2, a capacitor C4, a resistor R11 and a loudspeaker SPEAKER;
the input end of a transformer W is connected with a mains supply, one end of the output end of the transformer W is connected with a port 1 of a rectifier T, the other end of the output end of the transformer W is connected with a port 3 of the rectifier T, a port 2 of the rectifier T is connected with a port 2 of a pi-type filter Y, a port 4 of the rectifier T is connected with a port 1 of the pi-type filter Y, a port 3 of the pi-type filter Y is connected with a resistor R1, a capacitor C1 and a resistor R2, a port 4 of the pi-type filter Y is connected with the other end of a resistor R1 and the other end of a capacitor C1, the other end of a resistor R2 is connected with the anode of a diode D1 and the input end of a voltage stabilizer U1, the cathode of the diode D1 is connected with a resistor R4, the other end of the resistor R4 is grounded, the ground end of a voltage stabilizer U1 is connected with a resistor R3 and a potentiometer RP1, the other end of the potentiometer RP1 is grounded, the output end of the voltage stabilizer U1 is connected with the other end of the resistor R3 and the other end of the rectifier T3, A button;
the other end of the button is connected with a pin No. 4 of an integrated circuit U2, a pin No. 8 of an integrated circuit U2 and a resistor R6, the other end of a resistor R6 is connected with a pin No. 7 of an integrated circuit U2 and a resistor R5, the other end of a resistor R5 is connected with a pin No. 2 of an integrated circuit U2, a pin No. 6 of an integrated circuit U2 and a capacitor C3, the other end of the capacitor C3 is grounded, a pin No. 1 of the integrated circuit U3 is grounded, a pin No. 5 of the integrated circuit U3 is connected with the capacitor C3, the other end of the capacitor C3 is grounded, a pin No. 3 of the integrated circuit U3 is connected with the resistor R3, the relay J3, the cathode of a diode D3, the cathode of the diode D3, the G pole of a MOS tube V3, the other end of the relay J3 is grounded, the other end of the relay J3 is connected with the MOS tube S3, the D pole of the MOS transistor V2 is connected with a resistor R8, the other end of the resistor R8 is connected with the in-phase end of the resistor R9 and the in-phase end of an amplifier U3, the other end of the resistor R9 is grounded, the output end of the amplifier U3 is connected with a resistor R10, a resistor R11 and a loudspeaker SPEAKER, the other end of the resistor R10 is grounded, the other end of the loudspeaker SPEAKER is grounded, the other end of the resistor R11 is connected with the inverted end of a capacitor C4 and the amplifier U3, and the other end of the capacitor C4 is grounded.
2. The alarm control system for abnormal operation of elevator according to claim 1, wherein the relay J1, the relay J2 and the relay J4 are time relays and are connected in a normally closed mode.
3. The alarm control system for abnormal operation of elevator as claimed in claim 1, wherein said diode D1 is a light emitting diode, and said diodes D2 and D3 are zener diodes.
4. The alarm control system for the abnormal operation of the elevator as claimed in claim 1, wherein the transistors V1 and V3 are photo NPN transistors, and the MOS transistor V2 is a PMOS transistor.
5. The elevator abnormal operation alarm control system according to claim 4, wherein when light emitted from the diode D1 is irradiated on the bases of the phototriode V1 and the phototriode V3, the bases of the phototriode V1 and the phototriode V3 are conducted; when the light emitted by the diode D1 does not irradiate the bases of the phototriode V1 and the phototriode V3, the bases of the phototriode V1 and the phototriode V3 are cut off.
6. The elevator abnormal operation alarm control system of claim 1, wherein said voltage regulator U1 is model 78L 05.
7. The elevator abnormal operation alarm control system of claim 1, wherein the integrated circuit U2 model is a 555 timer.
8. The elevator abnormal operation alarm control system according to claim 1, wherein the amplifier U3 is model AD 8606.
9. The elevator abnormal operation alarm control system according to claim 8, wherein the capacitor C4 makes the amplifier U3 output a square wave signal by sucking and discharging electricity.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2235958Y (en) * 1994-11-01 1996-09-25 成都市长江机电研究所 Elevator emergency flat-layer and door-opening device
CN2248703Y (en) * 1995-12-07 1997-03-05 梁民鑫 Device for monitoring operation state of elevator
CN106586755A (en) * 2017-02-06 2017-04-26 上海峰景移动科技有限公司 Detection device and method for contact of elevator door lock in elevator safety circuit
CN206705428U (en) * 2016-12-08 2017-12-05 西继迅达(许昌)电梯有限公司 A kind of elevator safety loop detects circuit
CN212334289U (en) * 2020-03-25 2021-01-12 北京品科众联物联网科技有限公司 Elevator door lock loop short circuit remote monitoring system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2235958Y (en) * 1994-11-01 1996-09-25 成都市长江机电研究所 Elevator emergency flat-layer and door-opening device
CN2248703Y (en) * 1995-12-07 1997-03-05 梁民鑫 Device for monitoring operation state of elevator
CN206705428U (en) * 2016-12-08 2017-12-05 西继迅达(许昌)电梯有限公司 A kind of elevator safety loop detects circuit
CN106586755A (en) * 2017-02-06 2017-04-26 上海峰景移动科技有限公司 Detection device and method for contact of elevator door lock in elevator safety circuit
CN212334289U (en) * 2020-03-25 2021-01-12 北京品科众联物联网科技有限公司 Elevator door lock loop short circuit remote monitoring system

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Denomination of invention: An Alarm Control System for Abnormal Operation of Elevators

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