CN112141844A - Comprehensive detection system for safety assessment of old elevator - Google Patents
Comprehensive detection system for safety assessment of old elevator Download PDFInfo
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- CN112141844A CN112141844A CN202010939355.2A CN202010939355A CN112141844A CN 112141844 A CN112141844 A CN 112141844A CN 202010939355 A CN202010939355 A CN 202010939355A CN 112141844 A CN112141844 A CN 112141844A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0006—Monitoring devices or performance analysers
- B66B5/0018—Devices monitoring the operating condition of the elevator system
- B66B5/0031—Devices monitoring the operating condition of the elevator system for safety reasons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0006—Monitoring devices or performance analysers
- B66B5/0037—Performance analysers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0087—Devices facilitating maintenance, repair or inspection tasks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0087—Devices facilitating maintenance, repair or inspection tasks
- B66B5/0093—Testing of safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M13/00—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles
- F16M13/02—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles for supporting on, or attaching to, an object, e.g. tree, gate, window-frame, cycle
- F16M13/022—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles for supporting on, or attaching to, an object, e.g. tree, gate, window-frame, cycle repositionable
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Indicating And Signalling Devices For Elevators (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
The utility model provides a comprehensive testing system for old elevator safety aassessment, belongs to elevator detection technology field, including host computer, measuring unit includes noise sensor, pincerlike current sensor, voltage test pen, hall current sensor, speed sensor, sensor among the measuring unit links to each other with voltage test pen and host computer, the host computer includes connecting seat, voltage socket, circuit board, lithium cell, connecting seat, voltage socket, lithium cell link to each other with the circuit board respectively, noise sensor, pincerlike current sensor, hall current sensor, speed sensor link to each other through the connecting seat with the circuit board, voltage test pen links to each other through voltage socket with the circuit board. The invention is used for intuitively and accurately monitoring various performance parameters of the old elevator, thereby providing reliable data support for the safety performance evaluation of the old elevator and providing objective judgment basis for the current situation of the old elevator for detection personnel and related units.
Description
Technical Field
The invention belongs to the technical field of elevator detection, and particularly relates to a comprehensive detection system for safety evaluation of old elevators.
Background
With the great increase of the use amount of elevators in China, people are continuously strengthened on the understanding of potential safety hazards of the elevators. In recent years, elevator accidents frequently occur, such as sliding, trapping, rushing to the top, squatting at the bottom and the like, so that personal and property safety of the country and people is endangered, most of the accidents occur in old elevators, and therefore the safety problems of the old elevators gradually become the focus of people's attention and government's attention. The service life of part of components in the elevator equipment reaches a certain age limit, and the problems of wear and aging of components, shortage of spare part sources, reduction of safety performance and the like exist, so that the failure rate is increased finally; the maintenance difficulty of part of elevator equipment is increased and the period is prolonged because the elevator equipment is stopped; some elevator equipment still fall behind the design and manufacture standards at the time, and the performance requirements of the elevator equipment cannot meet the standards of the current laws and regulations.
At present, a plurality of elevator safety evaluation methods exist, but among them, a safety check list method, an analytic hierarchy process, an expert review method and a fuzzy comprehensive evaluation method are frequently applied to the old elevator safety evaluation. The old elevator safety risk rating is divided into qualitative evaluation and quantitative evaluation, but a report obtained by the qualitative evaluation lacks a specific measurement description, so that a user cannot clearly see the specific problems and risk frequency of the old elevator; the result provided by the quantitative evaluation method often has a certain gap with the evaluation requirement, which also makes the relevant units unable to see the relevant problems of old elevators.
The instruments for detecting the performance of the elevator in the market are various, but a safety evaluation system aiming at old elevators in a true sense does not exist. The existing detection instruments are basically indexes that one instrument only correspondingly detects the elevator, so that a special detection department carries a plurality of sets of equipment instruments each time the special detection department detects the elevator on site, the special detection department is very inconvenient to carry and manage, and the working efficiency of detection personnel is also influenced.
Disclosure of Invention
In order to solve the technical problems, the invention provides a comprehensive detection device for safety assessment of old elevators, which is used for intuitively and accurately monitoring various performance parameters of the old elevators, so that reliable data support is provided for the safety performance assessment of the old elevators, and objective judgment basis is provided for detection personnel and related units to the current situations of the old elevators.
The invention adopts the following technical scheme:
the utility model provides a comprehensive testing system for old elevator safety aassessment, includes host computer, measuring unit includes noise sensor, pincerlike current sensor, voltage test pen, hall current sensor, tacho sensor, sensor among the measuring unit links to each other with the host computer with voltage test pen, the host computer includes connecting seat, voltage socket, circuit board, lithium cell, connecting seat, voltage socket, lithium cell link to each other with the circuit board respectively, noise sensor, pincerlike current sensor, hall current sensor, tacho sensor link to each other through the connecting seat with the circuit board, voltage test pen and circuit board link to each other through voltage socket.
Further, the circuit board central processing unit is STM32X103VET6, speed sensor, noise sensor pass through the connecting seat and connect the central processing unit through serial ports analog-to-digital conversion, hall current sensor passes through the connecting seat and connects the central processing unit through operational amplifier AD analog-to-digital conversion, the three-phase voltage of elevator converter U, V, W is gathered to the voltage test pen, pass through the connecting seat and converter, operational amplifier AD conversion connection central processing unit, pincerlike current sensor gathers elevator converter IU, IW, pass through the connecting seat and converter, operational amplifier AD conversion connection central processing unit, central processing unit and bluetooth module serial port communication.
Further, speed sensor includes atress seat, hand (hold) nut, keysets, universal joint, magnetic force meter seat switch, magnetic force meter seat universal rod, universal knob, contact tachometry wheel, encoder shell, backup pad, contact tachometry wheel links to each other through the jackscrew is coaxial with the encoder, the encoder outside is equipped with the encoder shell, the encoder shell links to each other with the atress seat through the backup pad, the built-in pressure spring of atress seat, on the nut was fixed in the keysets to the atress seat, the connecting rod linked to each other with the magnetic force meter seat universal rod through the universal joint, was adjusted fixedly by universal knob, the magnetic force meter seat is equipped with the switch.
Furthermore, the encoder shell is provided with a window for externally arranging a connecting cable of the rotary encoder.
The system further comprises a software operation unit, wherein the software operation unit comprises an elevator carrying quality module, a balance coefficient module, a steel wire rope slippage module, a hall door speed module, an uplink overspeed protection module, an accidental movement module and an old elevator evaluation module, the elevator carrying quality module obtains a measurement result through a vibration curve and a noise curve, the balance coefficient module displays an uplink power curve or a downlink power curve, software can calculate the measurement result to obtain an elevator balance coefficient detection result, and the steel wire rope slippage module displays two speed and time curves of a traction sheave and the steel wire rope to obtain a corresponding detection result; the hall door speed module displays a two-dimensional curve of speed and time to obtain a corresponding measurement result; the uplink overspeed protection module displays a two-dimensional curve of speed and time to obtain a corresponding measurement result; the unexpected moving module displays the speed and time curve of the steel wire rope of the traction sheave to obtain a corresponding detection result; the old elevator evaluation module enters the evaluation function of the traction elevator and the escalator, creates a report and establishes corresponding evaluation software, clicks the evaluation content of the corresponding project according to the actual situation, and realizes the storage, the export and the comprehensive safety condition grade of the corresponding report after all the projects are clicked.
The invention has the advantages and effects that:
the comprehensive detection device and the system for the safety assessment of the old elevator are convenient to carry and high in accuracy, realize the conversion of qualitative detection and quantitative detection, and bring visual and accurate detection data and assessment reports for the detection of the item, thereby providing powerful data support for the detection personnel and relevant units to objectively judge the current situation of the old elevator.
Drawings
FIG. 1 is a block diagram of a fabric connection and data processing system;
FIG. 2 is a schematic diagram of a host architecture;
FIG. 3 is a schematic top view of the mainframe;
FIG. 4 is a schematic diagram of a speed sensor in the measurement unit;
fig. 5 is a schematic diagram of the application of the comprehensive detection device for the safety evaluation of the old elevator.
The components in the figure: 1 is the connecting seat, 2 is the casing, 3 is the voltage socket, 4 is the antenna, 5 is the circuit board, 6 is switch, 7 is the lithium cell, 8 is switch pilot lamp, 9 is the socket that charges, 10 is the atress seat, 11 is the handle nut, 12 is the switching pole, 13 is the universal joint, 14 is magnetic meter seat switch, 15 is the magnetic meter seat, 16 is the magnetic meter seat universal pole, 17 is the universal knob, 18 is the contact tachometer wheel, 19 is the encoder, 20 is the encoder shell, 21 is the backup pad.
Detailed Description
The invention is further explained below with reference to the figures and the examples.
The comprehensive detection device for the safety evaluation of old elevators comprises a main machine unit, a measurement unit and a software operation terminal. The measuring unit comprises a noise sensor, a pincerlike current sensor, a voltage testing pen, a Hall current sensor and a speed measuring sensor. The speed measuring sensor in the measuring unit can adsorb the magnetic gauge stand at a proper position in the measuring process through the magnetic gauge stand switch, the universal rod is adjusted to enable the contact speed measuring wheel to be in close contact with the measured object, the adjusting knob and the handle nut are locked, the contact speed measuring wheel can rotate along with the measured object under the pre-pressure of the pressure spring in the stress base, and the accuracy of data measurement is guaranteed. Each sensor module in the measuring unit is attached with a connecting cable, the other end of the connecting cable can be in data communication with the host, and the voltage test pen is used for connecting the output end of the elevator frequency converter and the host unit.
The comprehensive detection device for safety evaluation of old elevator includes three parts of main machine unit, measuring unit and software operation unit. The measuring unit comprises three noise sensors, a pincerlike current sensor, a voltage testing pen, a Hall current sensor and a speed measuring sensor.
The noise sensor adopts an electronic YAV Z2, the clamp-shaped current sensor adopts a middle-holt sensing CHCS-LS08-50AP402, the Hall current sensor adopts a dazzling Delchang electronic Hall switching current direct current sensor HSTS016L, and the voltage test pen adopts a pure copper crocodile carrying silica gel line to change into a 4mm banana plug test line.
Each sensor module in the measuring unit is connected with a connecting cable which is connected with the connecting seat corresponding to the host in a pluggable manner. The voltage test pen is used for connecting the output end of the elevator frequency converter with the host unit to obtain the three-phase voltage of the frequency converter U, V, W; the pincerlike current sensor acquires current at the output end U, W of the frequency converter; the Hall current sensor acquires the time point from the existence to the nonexistence of the band-type brake current so as to acquire an elevator braking node; selecting different measuring units according to the measured functions to be connected with the host; the host unit is connected with the software operation terminal through wireless communication.
The contact tachometer wheel 18 of the speed sensor in the measuring unit is coaxially connected with the encoder 19 through a jackscrew. The rotary encoder is externally provided with an encoder shell 20, and the encoder shell 20 is provided with a window to realize that a connecting cable of the rotary encoder is externally arranged.
The encoder shell is connected with the stress base 10 through the supporting plate 21 and fixed by screws, the stress base 10 is internally provided with a pressure spring, the contact between the tachometer wheel 18 and a measured object in the measuring process is realized through the pre-pressure of the pressure spring, and the measuring accuracy is ensured. The stressed seat is fixed on the adapter rod 12 through a handle nut 11, the connecting rod 12 is connected with a universal rod 16 of the magnetic meter seat through a universal joint 13, and the stressed seat is adjusted and fixed through a universal knob 17. The magnetic gauge stand 15 is provided with a switch 14, and the adsorption property can be ensured by locking.
The host unit is protected by a casing 2, a lithium battery 7 and a circuit board 5 are arranged in the host unit, wherein various connecting seats connected with the measuring unit, an antenna 4, a charging socket 9 of the lithium battery, a power switch 6 and a power switch indicator light 8 are arranged on the outer wall of the casing.
STM32X103VET6 of ST company is selected for use to circuit board central processing unit, the circuit board sets up each connection socket of measuring unit respectively, be connected with host computer shell measuring unit's connecting seat, speed sensor, noise sensor passes through the connecting seat and connects central processing unit through serial ports analog-to-digital conversion, hall current sensor passes through the connecting seat and connects central processing unit through operational amplifier AD analog-to-digital conversion, voltage test pen gathers elevator converter U, V, W three-phase voltage, pass through the converter through the connecting seat, operational amplifier AD conversion connects central processing unit, pincerlike current sensor gathers elevator converter IU, IW, pass through the converter through the connecting seat, operational amplifier AD conversion connects central processing unit. The central processing unit is in serial port communication with the Bluetooth module to realize Bluetooth wireless connection with the handheld terminal.
The software operation unit is an android intelligent operation terminal and is provided with operation software, and the intelligent operation terminal is connected with the host unit through wireless communication. The software operation unit is provided with old elevator evaluation software, corresponding evaluation contents are selected according to the actual running condition of the elevator and the measured data, and an evaluation report and a safety condition grade are obtained through the analysis of intelligent software.
The software covers eight functional modules, including elevator carrying quality, balance coefficient, steel wire rope slippage, hoistway door speed, uplink overspeed protection, accidental movement and old elevator evaluation software, corresponds to eight functions of the host computer, and selects different measuring units to be connected with the host computer according to the measured functions.
The invention provides an old elevator safety evaluation system, which integrates eight functions into a whole and is used for evaluating an elevator according to detection results of all functions to obtain the specific condition of the detected elevator. The eight major functions include: elevator carrying quality, balance coefficient, steel wire rope slippage, hall door speed, uplink overspeed protection, accidental movement and old elevator evaluation software.
The host unit comprises a hollow casing, a lithium battery, a circuit board and an antenna, wherein the casing is provided with connecting seats with each sensor in the measuring unit, a lithium battery charging seat, an antenna connecting seat, a power switch and a power indicator lamp.
The software operation unit is an android intelligent operation terminal and is provided with operation software, and the intelligent operation terminal is connected with the host unit through wireless communication. The software operation is provided with old elevator evaluation software, corresponding evaluation contents are selected according to the actual running condition of the elevator and the measured data, and an evaluation report and a safety condition grade are obtained through the analysis of intelligent software.
The operation process is roughly as follows:
1. the elevator carrying quality is as follows: and connecting the noise sensor in the measuring unit with the host unit. The host computer is placed to the intermediate position of being surveyed elevator car, and noise sensor is just to the elevator door. And opening a power switch of a host, opening an application program of the old elevator evaluation system of the software operation terminal, entering a menu of the (elevator carrying quality), prompting operation according to software contents, starting the elevator after measurement is started, displaying a noise curve of three vibration curves on an interface in real time at the moment, and finishing measurement after the elevator stops opening a door. And obtaining and storing corresponding measurement results.
2. Elevator balance coefficient: the rated speeds of the up and down of the elevator are measured by the elevator quality module function in the instrument. The three voltage test pens and the two clamp type current sensors are connected with a host respectively, the voltage test pens are connected to the U (yellow), V (green) and W (red) ends of the output end of a frequency converter in the elevator control cabinet according to the sequence, and then the current sensors are clamped to U, W end wires. Entering a software operation terminal (elevator balance coefficient) menu and inputting corresponding measurement parameters. And starting the elevator, and respectively measuring the uplink power and the downlink power of the elevator. At the moment, the software displays the uplink power or the downlink power curve in real time. The software can calculate the measuring result, obtain the elevator balance coefficient detecting result and save.
3. The elevator braking performance is as follows: the speed sensor A and the Hall current sensor are respectively connected with a host, a rotating wheel on the speed sensor A is in pre-pressing contact with a steel wire rope of a traction machine, and then the current sensor is clamped on a positive power supply line of an elevator brake. Entering a software operation terminal (elevator braking capability) menu, inputting corresponding measurement parameters, starting measurement, simultaneously starting elevator running, pressing an elevator emergency stop switch or disconnecting an elevator power supply when the elevator running speed is stable, stopping measurement after the elevator running is stopped, and displaying a two-dimensional curve of speed and time in real time by a software interface to obtain and store a corresponding measurement result.
4. Slippage of the elevator steel wire rope: the speed sensor A and the speed sensor B are respectively connected with a host, a rotating wheel on the speed sensor A is in prepressing contact with a steel wire rope of a traction machine, and a rotating wheel on the speed sensor B is in prepressing contact with the outer diameter of a traction wheel of an elevator. Entering a menu of a software operation terminal (slippage of an elevator steel wire rope), inputting corresponding measurement parameters, starting measurement, simultaneously starting elevator running, and pressing an elevator emergency stop switch or disconnecting an elevator power supply after the elevator running speed is stable. And after the elevator stops running, stopping measurement, and displaying two speed and time curves of the traction sheave and the steel wire rope in real time by the software interface to obtain and store corresponding detection results.
5. Hoistway door speed: the method comprises the steps of connecting a speed sensor A with a host, prepressing and contacting a rotating wheel on the speed sensor A with a hoistway door, entering a software operation terminal (hoistway door speed) menu, inputting corresponding measurement parameters, starting measurement, starting elevator operation at the same time, opening the hoistway door, stopping measurement after the hoistway door is completely opened, displaying a two-dimensional curve of speed and time in real time by a software interface, and obtaining and storing a corresponding measurement result.
6. And (3) uplink overspeed protection: the speed sensor A and the current sensor are respectively connected with a host, a rotating wheel on the speed sensor A is in pre-pressing contact with a steel wire rope of a traction machine, and then the current sensor is clamped on a positive power supply wire of an elevator brake. Entering a software operation terminal (elevator ascending overspeed protection) menu, inputting corresponding measurement parameters, starting measurement, simultaneously carrying out an ascending overspeed protection test on the elevator, stopping measurement after the elevator ascending overspeed protection test is finished, displaying a two-dimensional curve of speed and time in real time by a software interface, and obtaining and storing a corresponding measurement result.
7. Unexpected movement: the speed sensor A is connected with a host, and a rotating wheel on the speed sensor A is in pre-pressing contact with a steel wire rope of the traction machine. Entering a software operation terminal (accidental movement of the elevator) menu, inputting corresponding measurement parameters, starting measurement, simultaneously starting the elevator to perform an accidental movement test of the elevator, stopping measurement after the test is finished, displaying a speed and time curve of a steel wire rope of the traction sheave in real time by a software interface, and obtaining and storing corresponding detection results.
8. Old elevator evaluation: entering a software operation terminal (old elevator evaluation) menu can respectively enter the evaluation functions of the traction elevator and the escalator, creating a report and establishing corresponding evaluation software, and clicking the evaluation content of a corresponding project according to the actual situation. After all the items are clicked, corresponding report storage, export and comprehensive safety condition levels can be achieved.
Claims (5)
1. A comprehensive detection system for safety assessment of old elevators is characterized in that: including host computer, measuring unit includes noise sensor, pincerlike current sensor, voltage test pen, hall current sensor, tacho sensor, sensor among the measuring unit links to each other with the host computer with the voltage test pen, the host computer includes connecting seat (1), voltage socket (3), circuit board (5), lithium cell (7), connecting seat (1), voltage socket (3), lithium cell (7) link to each other with circuit board (5) respectively, noise sensor, pincerlike current sensor, hall current sensor, tacho sensor link to each other through connecting seat (1) with circuit board (5), the voltage test pen links to each other through voltage socket (3) with circuit board (5).
2. The comprehensive detection system for the safety evaluation of old elevators according to claim 1, characterized in that: the circuit board (5) central processing unit is STM32X103VET6, speed sensor, noise sensor pass through the connecting seat and connect central processing unit through serial ports analog-to-digital conversion, hall current sensor passes through the connecting seat and connects central processing unit through operational amplifier AD analog-to-digital conversion, the voltage test pen gathers elevator converter U, V, W three-phase voltage, pass through the connecting seat and connect central processing unit through converter, operational amplifier AD conversion, pincerlike current sensor gathers elevator converter IU, IW, pass through the connecting seat and converter, operational amplifier AD conversion connection central processing unit, central processing unit and bluetooth module serial port communication.
3. The comprehensive detection system for the safety evaluation of old elevators according to claim 1, characterized in that: the speed measuring sensor comprises a stress base (10), a handle nut (11), a switching rod (12), a universal joint (13), a magnetic meter base switch (14), a magnetic meter base (15), a magnetic meter base universal rod (16), a universal knob (17), a contact speed measuring wheel (18), an encoder (19), an encoder shell (20) and a support plate (21), wherein the contact speed measuring wheel (18) is coaxially connected with the encoder (19) through a jackscrew, the encoder shell (20) is arranged outside the encoder (19), the encoder shell (20) is connected with the stress base (10) through the support plate (21), a pressure spring is arranged in the stress base (10), the stress base (10) is fixed on the switching rod (12) through the handle nut (11), the connecting rod (12) is connected with the magnetic meter base universal rod (16) through the universal joint (13) and is adjusted and fixed through the universal knob (17), the magnetic meter base (15) is provided with a switch (14).
4. A comprehensive detection system for old elevator safety evaluation according to claim 3, characterized in that: the encoder shell (20) is provided with a window for externally arranging a connecting cable of the rotary encoder.
5. The comprehensive detection system for the safety evaluation of old elevators according to claim 1, characterized in that: the system also comprises a software operation unit, wherein the software operation unit comprises an elevator carrying quality module, a balance coefficient, a steel wire rope slippage, a hall door speed, an uplink overspeed protection module, an accidental movement module and an old elevator evaluation module, the elevator carrying quality module obtains a measurement result through a vibration curve and a noise curve, the balance coefficient module displays an uplink power curve or a downlink power curve, software can calculate the measurement result to obtain an elevator balance coefficient detection result, and the steel wire rope slippage module displays two speed and time curves of a traction wheel and the steel wire rope to obtain a corresponding detection result; the hall door speed module displays a two-dimensional curve of speed and time to obtain a corresponding measurement result; the uplink overspeed protection module displays a two-dimensional curve of speed and time to obtain a corresponding measurement result; the unexpected moving module displays the speed and time curve of the steel wire rope of the traction sheave to obtain a corresponding detection result; the old elevator evaluation module enters the evaluation function of the traction elevator and the escalator, creates a report and establishes corresponding evaluation software, clicks the evaluation content of the corresponding project according to the actual situation, and realizes the storage, the export and the comprehensive safety condition grade of the corresponding report after all the projects are clicked.
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| CN202010939355.2A CN112141844A (en) | 2020-09-09 | 2020-09-09 | Comprehensive detection system for safety assessment of old elevator |
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| CN202010939355.2A CN112141844A (en) | 2020-09-09 | 2020-09-09 | Comprehensive detection system for safety assessment of old elevator |
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| CN108861917A (en) * | 2018-06-22 | 2018-11-23 | 广西烽火信息技术有限公司 | A method of checking that elevator is run by wechat platform |
| CN109733971A (en) * | 2019-02-28 | 2019-05-10 | 滨州市特种设备检验研究所 | Balance coefficient of elevator detection device and its method |
| CN211310486U (en) * | 2019-11-12 | 2020-08-21 | 洛阳中重自动化工程有限责任公司 | Rope loosening protection system based on wireless positioning |
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|---|---|---|---|---|
| US5578801A (en) * | 1989-04-07 | 1996-11-26 | Technischer Uberwachungs-Verein Bayern E.V. | Apparatus and method for sensing slippage of elevator drive cable over a traction sheave |
| CN101525100A (en) * | 2008-08-29 | 2009-09-09 | 中国特种设备检验协会 | Elevator energy efficiency detector and detection method thereof |
| CN201406235Y (en) * | 2009-03-27 | 2010-02-17 | 北京市朝阳区特种设备检测所 | Dynamic intelligent monitoring device for elevator |
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Application publication date: 20201229 |
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