CN109095308A - A kind of elevator race abrasion reliability detection method - Google Patents
A kind of elevator race abrasion reliability detection method Download PDFInfo
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- CN109095308A CN109095308A CN201810816815.5A CN201810816815A CN109095308A CN 109095308 A CN109095308 A CN 109095308A CN 201810816815 A CN201810816815 A CN 201810816815A CN 109095308 A CN109095308 A CN 109095308A
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- reliability
- race
- abrasion
- elevator
- host computer
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Indicating And Signalling Devices For Elevators (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
The invention discloses a kind of elevator races to wear away reliability detection method, reliability monitoring system is worn away including terminal abrasion loss test side, transistroute and host computer, the abrasion data that terminal abrasion loss test side will test is handled and is sent to transfer routing；Transfer routing is transferred to host computer abrasion reliability monitoring system after receiving data；Host computer wears away calculating, real-time display and the storage that reliability monitoring system realizes elevator race abrasion reliability；Processor uses MSP430 single-chip microcontroller, and radio transmitting and receiving chip uses radio transmitting and receiving chip CC110L.Above-mentioned detection method be it is non-contacting, can be realized quickly, high-precision judgment and detection elevator race abrasion the degree of reliability, solve elevator reliability detection key technology, have a wide range of applications.
Description
Technical field
The present invention relates to elevator detection technique fields, and in particular to a kind of elevator race abrasion reliability detection method.
Background technique
Traction elevator holds because having many advantages, such as that high reliablity, highly-safe, hoisting depth is unrestricted in the application
Speed easy to control, therefore be widely applied and become the mainstream elevator in market.The lifting of traction elevator mainly passes through
Tractive driving realizes that the system can complete the fixed lifting of fixed floor, and passenger is facilitated to go on a journey, and meets people on the living conditions
Specific requirements.
But from its in a particular application the case where from the point of view of, its race of existing traction elevator is easy to be worn, and draws
Hair accident constitutes a serious threat to the person and equipment safety.For example, certain office electricity consumption is terraced, device model TKJ1000/
1.75JXW, normal speed 1.75m/s, nominal load capacity 1000kg have been run 5 years, elevator traction sheave two tractions in the outer part
Wirerope grinds traction sheave rope groove, and abrasion loss seriously reaches 3-5mm, finally causes accident.Elevator is during routine use, to equipment
Safety have very high request, it can be seen that, reinforce the detection that wears away to elevator race and have important practical significance.
Currently, elevator traction sheave Abrasion detecting mainly uses the inspection of the scene of a crime and test wirerope pretwist torque etc., this
A little methods are time-consuming and laborious, and cannot quickly, accurately and reliably judgment and detection elevator race wears away situation, cannot be quantitatively
The safety of elevator is monitored from the angle of reliability.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of elevator race abrasion reliability detection
Method, the detection method be it is non-contacting, can be realized quickly, high-precision judgment and detection elevator race abrasion reliable journey
Degree solves the key technology of elevator reliability detection.
To achieve the above object, the present invention provides the following technical scheme that a kind of elevator race wears away reliability detection side
Method, including terminal abrasion loss test side, transistroute and host computer wear away reliability monitoring system, it is characterised in that: the end
The abrasion data that end abrasion loss test side will test is handled and is sent to transfer routing；Transfer routing passes after receiving data
It is defeated by host computer abrasion reliability monitoring system；Host computer wears away reliability monitoring system and realizes elevator race abrasion reliability
Calculating, real-time display and storage；Elevator race wears away reliability detection, and specific step is as follows:
(1) terminal data acquire: the hanging steel rope in traction sheave rope groove, the both ends of wirerope respectively with counterweight and carriage
Connection, fricting movement completes the drive of the landing and rise to carriage between wirerope and traction sheave, using non-cpntact measurement, benefit
The abrasion of elevator race are detected with vortex current sensor；
(2) it terminal data processing: after the collected data of vortex current sensor are by amplification, detection, filtering, passes
It gives processor to be AD converted, converts digital signal for voltage signal, simultaneously as vortex current sensor is by temperature
Spend the temperature-compensating by temperature measured by the temperature sensor inside combination processing device, being segmented to measured value that is affected
Processing, the numerical value after the completion of handling send radio transmitting and receiving chip to by the SPI interface of processor, complete adopting for terminal data
Collection, processing and transmission；
(3) after terminal data transmission wears away reliability monitoring system to host computer, host computer wears away reliability monitoring system
According to calibrated initial value by elevator race abrasion loss is calculated.
Preferably, step (2) includes following sub-step:
(2.1) lock detector is designed using analog multiplier, synchronous detection also uses analog multiplier by synchronization signal
It is multiplied with modulated signal；
(2.2) high-frequency amplifier circuit is set between vortex current sensor fore-lying device and wave detector, for amplifying
The high-frequency signal of acquisition, while being isolated and coming from external interference, cutoff frequency 100HZ；
(2.3) wireless communication be to be realized based on radio transmitting and receiving chip, be set in 315MHz, 433MHz, 868MHz and
ISM the and SRD frequency range of 915MHz；Rf frequency 433MHz is selected, using omnidirectional antenna as transmitting and receiving antenna.
Preferably, processor uses MSP430 single-chip microcontroller, radio transmitting and receiving chip uses radio transmitting and receiving chip CC110L,
Radio transmitting and receiving chip initialization includes the configuration of electrification reset and internal register.
Radio transmitting and receiving chip using cyclic redundancy check code CRC carry out error detection, transmitting terminal according to the position the k to be transmitted two into
Code sequence processed is generated the position the r picket code (CRC code) of a verification with certain rule, is attached to raw information back, constitutes one
A new binary code sequence number is k+r total, then sends；In receiving end, followed according between information code and CRC code
Rule test, with determine transmission in whether malfunction.
Host computer wear away reliability monitoring system host computer abrasion reliability calculating the following steps are included:
(a) according to Reliability Engineering and reliability theory, it is based on probability interference technique, it is close to calculate race wear-out failure probability
Degree；The abrasion loss w of race makes the probability of elevator cisco unity malfunction, is denoted as f (w), is formulated:
In formula, μ is the mean value of race abrasion loss, σ2For the variance of race abrasion loss, w is the abrasion loss of race.
(b) race wear-out failure probability density function is integrated, obtains race abrasion cumulative failure probability, race
The unreliable degree of abrasion is indicated with F (w):
(c) it according to the abrasion loss w of terminal data acquisition and the race of transfer route transmission to host computer, calculates and supervises in real time
The reliability of measuring wheel slot abrasion, is indicated with R (w):
R (w)=1-F (w).
The invention has the advantages that compared with prior art, the present invention uses conductor vortex inductive effect, wireless radio-frequency
The detection method of a non-contacting traction elevator race abrasion reliability is devised with reliability theory.The terminal of system is logical
Cross the alternating magnetic field and the opposite alternating magnetic field that incudes of tested elevator race of vortex current sensor probe coil generation
The superposition that is vortexed causes the effective impedance of probe coil to change to detect elevator race abrasion loss, during the data of abrasion loss pass through
Turn routing and is transmitted to host computer abrasion reliability monitoring system.Host computer wears away reliability monitoring system based on Reliability Engineering
Elevator race abrasion loss is considered as a stochastic variable by probability principle of interference, establishes elevator race abrasion reliability calculating
Model, the present invention can be realized the degree of reliability of quick high-precision judgment and detection elevator race abrasion, it is reliable to solve elevator
Property detection key technology, have a wide range of applications.
The invention will be further described with specific embodiment with reference to the accompanying drawings of the specification.
Detailed description of the invention
Fig. 1 is the system structure diagram of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of vortex of embodiment of the present invention current sensor；
Fig. 3 is the terminal of that embodiment of the invention flow chart of data processing schematic diagram；
Fig. 4 is high-frequency amplifier circuit of embodiment of the present invention schematic diagram；
Fig. 5 is the circuit diagram of wave detector of the embodiment of the present invention；
Fig. 6 is the schematic diagram of processor operating mode of the embodiment of the present invention；
Fig. 7 is the data transmit-receive flow diagram of radio transmitting and receiving chip of the embodiment of the present invention.
Specific embodiment
Referring to Fig. 1 to Fig. 7, a kind of elevator race abrasion reliability detection method disclosed by the invention, including terminal abrasion
It measures test side, transistroute and host computer and wears away reliability monitoring system, the mill that terminal abrasion loss test side will test
Consumption data are handled and are sent to transfer routing；Transfer routing is transferred to host computer abrasion reliability monitoring system after receiving data
System；Host computer wears away calculating, real-time display and the storage that reliability monitoring system realizes elevator race abrasion reliability；Elevator
Race wears away reliability detection, and specific step is as follows:
(1) terminal data acquire: the hanging steel rope in traction sheave rope groove, the both ends of wirerope respectively with counterweight and carriage
Connection, fricting movement completes the drive of the landing and rise to carriage between wirerope and traction sheave, using non-cpntact measurement, benefit
The abrasion of elevator race are detected with vortex current sensor；
(2) it terminal data processing: after the collected data of vortex current sensor are by amplification, detection, filtering, passes
It gives processor to be AD converted, converts digital signal for voltage signal, simultaneously as vortex current sensor is by temperature
Spend the temperature-compensating by temperature measured by the temperature sensor inside combination processing device, being segmented to measured value that is affected
Processing, the numerical value after the completion of handling send radio transmitting and receiving chip to by the SPI interface of processor, complete adopting for terminal data
Collection, processing and transmission；
(3) after terminal data transmission wears away reliability monitoring system to host computer, host computer wears away reliability monitoring system
According to calibrated initial value by elevator race abrasion loss is calculated.
Preferably, processor uses MSP430 single-chip microcontroller, radio transmitting and receiving chip uses radio transmitting and receiving chip CC110L.
Terminal data acquisition: vortex current sensor is exactly to utilize conductor vortex inductive effect, and non electrical quantity is converted
It is measured for coil impedance variation.Vortex current sensor fore-lying device medium-high frequency oscillating current passes through extension cable
Probe coil is flowed into, the magnetic field H of alternation is generated in the coil of probe head1.When tested elevator race is close to this magnetic field, then
The induced current of vortex shape is generated in wheel rooved face, the vortex current field also generates a direction and head coil side at the same time
To opposite alternating magnetic field H2, due to its reactions, the amplitude and phase of head coil high-frequency current are changed, line is caused
The effective impedance of circle changes, conductivityσ, magnetic conductivity ξ, size factor τ, head volume coils and the wheel of this variation and race
Distance D, current strength I and the frequencies omega parameter of rooved face describes.
The functional relation of coil characteristic impedance Z are as follows:
Z=F (τ, ξ, σ, D, I, ω)
In formula, σ is conductivity, ξ is magnetic conductivity, τ is size factor, D is head volume coils at a distance from wheel rooved face, I
For current strength, ω is frequency.
Usually control conductivityσ, magnetic conductivity ξ, size factor τ, current strength I and frequencies omega are constant in a certain range,
Then the characteristic impedance Z of coil just becomes the monotropic function of distance D, it may be assumed that
Z=F (D).
Terminal data processing: after the collected data of vortex current sensor are by amplification, detection, filtering, transmission
It is AD converted to MSP430 single-chip microcontroller.Digital signal is converted by voltage signal, simultaneously as vortex current sensor
Be affected by temperature it is larger, because the invention by combine MSP430 single-chip microcontroller inside temperature sensor measured by temperature, to measurement
The temperature-compensating processing that value is segmented, the numerical value after the completion of handling send wireless receiving and dispatching core to by the SPI interface of single-chip microcontroller
Piece CC110L completes the acquisition, processing and transmission of terminal data, as shown in Figure 3.Terminal data transmission can to host computer abrasion
After degree monitoring system, host computer wears away reliability monitoring system according to calibrated initial value by elevator race is calculated
Abrasion loss.
Preferably, step (2) includes following sub-step:
(2.1) lock detector is designed using analog multiplier, synchronous detection also uses analog multiplier by synchronization signal
It is multiplied with modulated signal；
(2.2) high-frequency amplifier circuit is set between vortex current sensor fore-lying device and wave detector, for amplifying
The high-frequency signal of acquisition, while being isolated and coming from external interference, cutoff frequency 100HZ；
(2.3) wireless communication be to be realized based on radio transmitting and receiving chip, be set in 315MHz, 433MHz, 868MHz and
ISM the and SRD frequency range of 915MHz；Rf frequency 433MHz is selected, using omnidirectional antenna as transmitting and receiving antenna.
The present invention designs lock detector using analog multiplier MC1496.Synchronous detection also uses analog multiplier
Synchronization signal is multiplied by MC1496 with modulated signal, and design circuit is as shown in Figure 5.
vxHold input carrier signal Uc:
Uc(t)=Ucm cosωct
In formula, UcmFor the amplitude of carrier signal, ωcFor the angular frequency of carrier signal.
vyEnd input modulated wave signal Us:
US(t)=Usm cosωctcosΩt
In formula, UsmFor the amplitude of carrier signal, ωcFor the angular frequency of carrier signal, Ω is the angular frequency of modulated signal.
It is multiplied through multiplier, as available from the above equation output signal U0(t) are as follows:
In formula, KEFor proportionality coefficient.
According to formula it is found that realize that synchronous detection need to be by the synchronization signal and modulated signal phase with high frequency carrier with frequency
Multiply, realizes synchronous demodulation.2 ω are filtered out by low-pass filter1After neighbouring frequency component, obtains the low frequency that frequency is Ω and believe
Number:
In formula, UsFor modulated wave signal, UCFor carrier signal,For phase difference.
Output is terminated with the low-pass filter of resistance R11, C6 composition and the capacitance of 1uF, so the circuit is to there is load
Demodulation can be achieved in the amplitude-modulated signal of wave amplitude-modulated signal and suppressed carrier.
Radio transmitting and receiving chip CC110L is a kind of low cost, low-power consumption, without applying for that frequency point, transmission are reliable, it is wireless to support
The single programmable transceiving chip of sensor network technique.Its working frequency range is flexible, can be set in 315MHz, 433MHz,
ISM the and SRD frequency range of 868MHz and 915MHz.Systematic selection rf frequency 433MHz, the frequency range are not necessarily to apply for that frequency range is permitted,
Transmitting is used as using omnidirectional antenna simultaneously and receives antenna so that it is guaranteed that signal transmitting is without dead zone.The present invention uses MSP430 core
The control that piece is carried out basic parameter setting to CC110L and sent and received by SPI mouthfuls, job design mode such as Fig. 6 institute
Show.
The initialization of radio transmitting and receiving chip CC110L.The initialization of radio transmitting and receiving chip CC110L include electrification reset and
The configuration of internal register.MSP430 single-chip microcontroller is read and write inside radio transmitting and receiving chip CC110L by SPI (Serial bus) and is posted
Storage address bit 0X00~0X3F realizes function setting and test.Wherein OX00~OX2E is configuration register address, carries out nothing
The setting of the basic functions such as line transceiving chip CC110L carrier frequency, data rate, data packet processing mode: 0X30~0X3F is shape
State register and command filtering device address, wherein status register is read-only, contains the state of radio transmitting and receiving chip CC110L
Information.
The present invention carries out error detection using cyclic redundancy check code CRC, in transmitting terminal according to the position the k to be transmitted binary code sequence
Column generate the position the r picket code (CRC code) of a verification with certain rule, are attached to raw information back, constitute one newly
Binary code sequence number is k+r total, then sends.In receiving end, according to the rule followed between information code and CRC code
It tests, to determine in transmission whether malfunction.Basic reception, transmission flow are as shown in Figure 7.
The calculating of host computer abrasion reliability
(a) according to Reliability Engineering and reliability theory, it is based on probability interference technique, it is close to calculate race wear-out failure probability
Degree.That is the abrasion loss of race makes the probability of elevator cisco unity malfunction, is denoted as f (w).It is formulated:
In formula, μ is the mean value of race abrasion loss, σ2For the variance of race abrasion loss.
(b) race wear-out failure probability density function is integrated, obtains race abrasion cumulative failure probability, that is, takes turns
The unreliable degree of slot abrasion.It is indicated with F (w).
(3) it according to the abrasion loss w of terminal data acquisition and the race of transfer route transmission to host computer, calculates and supervises in real time
The reliability of measuring wheel slot abrasion, is indicated with R (w).
R (w)=1-F (w)
The present embodiment monitors the abrasion of elevator race:
Measuring elevator race abrasion reliability mean value is 0.2mm, variance 0.05mm；
Wear away reliability monitoring result are as follows: 0.99875.
The present invention using conductor vortex inductive effect, wireless radio-frequency and reliability theory devise one it is non-contacting
The detection method of traction elevator race abrasion reliability.The terminal of system is produced by vortex current sensor probe coil
The vortex superposition for the opposite alternating magnetic field that raw alternating magnetic field incudes with tested elevator race causes the effective impedance of probe coil
It changes to detect elevator race abrasion loss, the data of abrasion loss are transmitted to host computer by transfer routing and wear away reliability prison
Control system.Host computer wears away probability principle of interference of the reliability monitoring system based on Reliability Engineering, elevator race abrasion loss
It is considered as a stochastic variable, establishes the model of elevator race abrasion reliability calculating, the present invention can be realized quickly, in high precision
The degree of reliability of judgment and detection elevator race abrasion, solves the key technology of elevator reliability detection, has and widely answer
Use prospect.
Above-described embodiment is served only for that invention is further explained to specific descriptions of the invention, should not be understood as
Limiting the scope of the present invention, the technician of this field make the present invention according to the content of foregoing invention some non-
The modifications and adaptations of essence are fallen within the scope of protection of the present invention.
Claims (5)
1. a kind of elevator race wears away reliability detection method, including terminal abrasion loss test side, transistroute and host computer mill
Consume reliability monitoring system, it is characterised in that: the abrasion data that terminal abrasion loss test side will test is handled simultaneously
It is sent to transfer routing；Transfer routing is transferred to host computer abrasion reliability monitoring system after receiving data；Host computer abrasion can
Calculating, real-time display and the storage of elevator race abrasion reliability are realized by degree monitoring system；Elevator race wears away reliability
Specific step is as follows for detection:
(1) terminal data acquires: the hanging steel rope in traction sheave rope groove, and the both ends of wirerope connect with counterweight and carriage respectively
It connects, fricting movement completes the drive of the landing and rise to carriage between wirerope and traction sheave, using non-cpntact measurement, utilizes
Vortex current sensor detects the abrasion of elevator race；
(2) it terminal data processing: after the collected data of vortex current sensor are by amplification, detection, filtering, sends to
Processor is AD converted, and converts digital signal for voltage signal, simultaneously as vortex current sensor is by temperature shadow
Temperature measured by the larger temperature sensor by inside combination processing device is rung, at the temperature-compensating being segmented to measured value
Reason, the numerical value after the completion of handling sends radio transmitting and receiving chip to by the SPI interface of processor, complete terminal data acquisition,
Processing and transmission；
(3) terminal data transmission to host computer wear away reliability monitoring system after, host computer wear away reliability monitoring system according to
Calibrated initial value is by being calculated elevator race abrasion loss.
2. a kind of elevator race according to claim 1 wears away reliability detection method, it is characterised in that: step (2) packet
Include following sub-step:
(2.1) using analog multiplier design lock detector, synchronous detection also use analog multiplier by synchronization signal with
Adjust signal multiplication；
(2.2) high-frequency amplifier circuit is set between vortex current sensor fore-lying device and wave detector, for amplifying acquisition
High-frequency signal, while be isolated come from external interference, cutoff frequency 100HZ；
(2.3) wireless communication is realized based on radio transmitting and receiving chip, is set in 315MHz, 433MHz, 868MHz and 915MHz
ISM and SRD frequency range；Rf frequency 433MHz is selected, using omnidirectional antenna as transmitting and receiving antenna.
3. a kind of elevator race according to claim 2 wears away reliability detection method, it is characterised in that: processor uses
MSP430 single-chip microcontroller, radio transmitting and receiving chip use radio transmitting and receiving chip CC110L, and radio transmitting and receiving chip initialization includes powering on again
The configuration of position and internal register.
4. a kind of elevator race according to claim 3 wears away reliability detection method, it is characterised in that: wireless receiving and dispatching core
Piece carries out error detection using cyclic redundancy check code CRC, in transmitting terminal according to the position the k to be transmitted binary code sequence, with certain
Rule generates the position the r picket code (CRC code) of a verification, is attached to raw information back, constitutes a new binary code sequence
Columns is k+r total, then sends；In receiving end, tested according to the rule followed between information code and CRC code,
To determine in transmission whether malfunction.
5. a kind of elevator race according to claim 1 wears away reliability detection method, it is characterised in that: host computer abrasion
Reliability monitoring system host computer abrasion reliability calculating the following steps are included:
(a) according to Reliability Engineering and reliability theory, it is based on probability interference technique, calculates race wear-out failure probability density；
The abrasion loss w of race makes the probability of elevator cisco unity malfunction, is denoted as f (w), is formulated:
In formula, μ is the mean value of race abrasion loss, σ2For the variance of race abrasion loss.
(b) race wear-out failure probability density function is integrated, obtains race abrasion cumulative failure probability, race abrasion
Unreliable degree, with F (w) indicate:
(c) according to the abrasion loss w of terminal data acquisition and the race of transfer route transmission to host computer, calculate and monitor in real time wheel
The reliability of slot abrasion, is indicated with R (w):
R (w)=1-F (w).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810816815.5A CN109095308B (en) | 2018-07-24 | 2018-07-24 | Elevator wheel groove abrasion reliability detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810816815.5A CN109095308B (en) | 2018-07-24 | 2018-07-24 | Elevator wheel groove abrasion reliability detection method |
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| Publication Number | Publication Date |
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| CN109095308A true CN109095308A (en) | 2018-12-28 |
| CN109095308B CN109095308B (en) | 2020-04-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021105545A1 (en) * | 2019-11-27 | 2021-06-03 | Kone Corporation | Monitoring of an elevator system |
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| CN104627762A (en) * | 2014-12-05 | 2015-05-20 | 中国矿业大学 | Detection system and detection method of friction elevator rope groove wear loss |
| CN105197755A (en) * | 2015-10-27 | 2015-12-30 | 苏州中远电梯有限公司 | Elevator device with elevator handrail structure capable of being simplified |
| CN206203616U (en) * | 2016-12-05 | 2017-05-31 | 立达博仕电梯（苏州）有限公司 | A kind of elevator traction sheave deflection wear detector |
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|---|---|---|---|---|
| GB1565293A (en) * | 1976-03-12 | 1980-04-16 | Mitsubishi Electric Corp | Position sensor device for elevator ear |
| EP0183616A2 (en) * | 1984-11-23 | 1986-06-04 | Otis Elevator Company | Elevator brake and safety |
| JPH0351281A (en) * | 1989-07-19 | 1991-03-05 | Hitachi Elevator Eng & Service Co Ltd | Controller of elevator |
| CN203359735U (en) * | 2013-06-17 | 2013-12-25 | 三洋电梯(珠海)有限公司 | Anti-abrasion protecting device for elevator traction wheel and elevator rope |
| CN104627762A (en) * | 2014-12-05 | 2015-05-20 | 中国矿业大学 | Detection system and detection method of friction elevator rope groove wear loss |
| CN105197755A (en) * | 2015-10-27 | 2015-12-30 | 苏州中远电梯有限公司 | Elevator device with elevator handrail structure capable of being simplified |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021105545A1 (en) * | 2019-11-27 | 2021-06-03 | Kone Corporation | Monitoring of an elevator system |
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Application publication date: 20181228 Assignee: HUIZHI INTELLIGENT TECHNOLOGY CO.,LTD. Assignor: Wenzhou University Contract record no.: X2021330000824 Denomination of invention: A reliability detection method for elevator wheel groove wear Granted publication date: 20200421 License type: Common License Record date: 20211220 |