CN109230952B - Method and system for monitoring tension and performance degradation of elevator traction steel belt - Google Patents
Method and system for monitoring tension and performance degradation of elevator traction steel belt Download PDFInfo
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- CN109230952B CN109230952B CN201811158274.8A CN201811158274A CN109230952B CN 109230952 B CN109230952 B CN 109230952B CN 201811158274 A CN201811158274 A CN 201811158274A CN 109230952 B CN109230952 B CN 109230952B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/12—Checking, lubricating, or cleaning means for ropes, cables or guides
- B66B7/1207—Checking means
- B66B7/1215—Checking means specially adapted for ropes or cables
- B66B7/1223—Checking means specially adapted for ropes or cables by analysing electric variables
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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
Abstract
The invention provides a method and a system for monitoring tension and performance degradation of an elevator traction steel belt, and belongs to the field of elevator monitoring. Injecting specific current into the steel wire rope core of each steel belt, and detecting the voltage value of the steel wire rope core of each steel belt; the elevator is operated for the next period, and the initial characteristic value of the steel wire rope core of each steel belt in the initial state of the elevator is calculated and recorded; when the elevator runs, acquiring whole-course data in a set time period, calculating and storing characteristic values of the steel wire rope cores of all the steel belts; and judging whether the steel wire rope cores of all the steel belts of the elevator have the problems of unbalanced tension or degraded performance of the steel belts according to the characteristic values. The invention has the beneficial effects that: the wire rope cores of all steel belts can be monitored simultaneously; the tension variation and the tension variation trend of each steel belt can be accurately detected; and monitoring the tension unevenness and the performance degradation trend of each steel strip in real time.
Description
Technical Field
The invention relates to an elevator monitoring method, in particular to a method and a system for monitoring tension and performance degradation of an elevator traction steel belt.
Background
The elevator traction steel belt is mainly formed by fusing a plurality of steel wire rope cores which are arranged in parallel and polymer materials which are externally coated. In actual operation the wire rope core carries the vast majority of the load on the steel belt. When the elevator runs, once a steel wire rope core in the steel belt is damaged, the tensile strength of the elevator traction steel belt is reduced, and the safe use of the elevator traction steel belt is influenced. When the tension of the steel belt is unbalanced or the performance of the steel belt is degraded, the tension cannot be judged and processed in time, the service life of each part of the elevator is influenced, and the safe operation of the elevator can be directly influenced.
At present, no unified elevator traction steel belt inspection standard and method exist in China, and the current standard specification mainly aims at traction steel wire rope elevators. TSGT 7001-2009 elevator supervision and inspection rules-traction and forced drive elevators-have allowed the use of other types of suspension devices (e.g. traction steel belts). At present, no specific terms for the inspection requirements of the traction steel belt exist, and the inspection requirements of the steel wire rope in relevant standard specifications can be referred to. GB/T10060-2011 Elevator installation and acceptance Specification: the average tension of any of the hoisting ropes or chains is not more than 5%. GB50310-2016 Elevator engineering construction quality acceptance Specification: the deviation of the tension of each wire rope from the average value should not be more than 5%. The existing patents and documents are directed to the detection of a steel wire rope core in a steel belt, but the tension change and the performance degradation trend of the steel belt cannot be accurately judged. The patent 'a method and device for monitoring the condition of an elevator bearing component' is to detect the resistance of a steel wire rope core by applying an electric signal to the steel wire rope core in a steel belt, and determine the condition of the steel wire rope core. The patent elevator dragging steel belt rope breakage detection method and device detects the last voltage signal by applying the first voltage signal, and judges whether the steel wire rope core in the steel belt is normally connected, the method can only judge whether the steel wire rope core is broken, the method can not judge the tension imbalance and the performance degradation trend of each steel belt, and the accurate safety monitoring and the prejudgment of the service life of the steel belt can not be realized. The method for measuring the uniformity of the tension of the traditional elevator traction steel wire rope mainly comprises the following steps: (1) the tension meter and the steel ruler are matched for measurement, the elevator car is firstly moved to the upper two thirds of the travel, and the tension value of each steel wire rope pulled by the same distance is respectively measured by a tester at the top of the elevator car through the tension meter. Due to the difficulty in operation, the method can not only ensure the measurement precision and detect the local tension value of the steel wire rope, but also stop the work of the elevator, has low efficiency and can not realize real-time monitoring; (2) the document DGZ elevator steel wire rope tension uniformity tester research and application aims at measuring the uniformity of the tension of the traditional elevator traction steel wire rope, and the basic principle is that a relation model of radial force and longitudinal force is deduced by analyzing the deformation characteristics of the steel wire rope after radial stress; (3) the patent elevator drags wire rope tension degree of consistency analysis tester also aims at the tensile even degree measurement of traditional elevator dragging wire rope, and this instrument adopts photoelectric probe to gather each wire rope's vibration cycle respectively, converts the vibration cycle into vibration frequency, calculates each wire rope's tension percentage value through the frequency and tensile functional relation again. The testing method cannot be used for detecting the tension of the steel belt, and the functional relation of the method cannot be universal for different traction steel wire ropes.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for monitoring the tension and the performance degradation of an elevator traction steel belt and a system for realizing the monitoring method.
The method comprises the following steps:
s1: injecting a specific current I into the steel wire rope core of each steel belt, and detecting the voltage value U of the steel wire rope core of each steel belt;
s2: the elevator is operated for the next period, and the initial characteristic value of the steel wire rope core of each steel belt in the initial state of the elevator is calculated and recorded;
s3: when the elevator runs, acquiring whole-course data in a set time period, calculating and storing characteristic values of the steel wire rope cores of all the steel belts;
s4: and judging whether the steel wire rope cores of all the steel belts of the elevator have the problems of unbalanced tension or degraded performance of the steel belts according to the characteristic values.
The invention is further improved, and the method also comprises the step S5: and comparing each characteristic value with the initial characteristic value, and evaluating the service life of each steel strip according to the comparison result and the change trend.
The invention is further improved in that in step S2, an initial floor for elevator operation is set, a period is such that the elevator goes from the initial floor to the highest floor to the lowest floor and then back to the initial floor, and the initial characteristic value includes the resistance r of the wire rope core of each steel strip of the initial floor0Fluctuation value vpp at runtime0Variance S0 2Standard deviation S0And the covariance matrix V of the data of each steel strip0。
In a further improvement of the present invention, in step S3, the characteristic values include: resistance r of initial layer resistor, fluctuation value vpp in operation, variance S2Standard deviation S and covariance matrix V of each root datum.
In step S4, the method for judging the tension imbalance of the steel strip includes:
in the period, the fluctuation value of the resistance of a certain steel belt is far larger or smaller than that of other steel belts, and the steel belt has the problem of uneven tension with other steel belts, namely
Or
The m-th steel strip has the problem of uneven tension with other steel strips, vppmRefers to the fluctuation value of the resistance of the mth steel strip,
means the average value of the resistance fluctuation values of all the steel strips except the m-th steel strip, a1、a2The set threshold value is indicated, and the m-th steel strip has the problem of uneven tension with other steel strips;
in this period, the increasing and decreasing trend of the resistance value of each steel strip is compared, the increasing and decreasing trend of a certain steel strip is inconsistent with that of other steel strips, and the tension of the steel strip is not uniform with that of other steel strips, namely the steel strip has the problem that the tension of the steel strip is not uniform
Rm' means the rate of change of the resistance of the m-th steel strip,
means the average value of the resistance change rates of all the steel strips except the m-th steel strip,
the contrast value of the resistance increasing and decreasing trend of the mth steel strip and other steel strips, a3Means the set threshold value, the m steel strip and other steel stripsThe problem of uneven tension;
during the period, when the resistance value of a certain steel belt does not fluctuate during the operation of the elevator, the steel belt has the problem of uneven tension with other steel belts, namely vppm<a4，vppmRefers to the fluctuation value of the resistance of the m-th steel strip, a4The m-th steel strip has the problem of uneven tension with other steel strips.
The invention is further improved, and the method for judging the performance degradation of the steel strip comprises the following steps:
the variation trend of different characteristic values of the same steel strip follows the law, when the variation trend of a certain characteristic value of a certain steel strip suddenly changes, the performance degradation problem of the steel strip occurs, namely when the g is met1(rm)＞b1、g2(vppm)＞b2And g3(Sm)＞b3In one of these three conditions, the m-th strip presents a degradation problem and it is necessary to monitor the strip characteristics, where b1、b2、b3To a set threshold value, rmResistance value of initial layer of mth steel strip, vppmThe fluctuation value of the resistance of the m-th steel strip, SmStandard deviation of resistance of m-th steel strip, g1(rm)、g2(vppm)、g3(Sm) Respectively representing the variation trends of the resistance value, the fluctuation value and the standard deviation when the steel strip runs;
according to the covariance matrix
When the parameters of a certain steel strip are suddenly changed, the steel strip has the performance degradation problem, n refers to the total number of the steel strips, v refers to the total number of the steel stripsijThe covariance value of the resistance of the ith and jth steel strips when h (v)i1,…,vin)＞b4When the i-th steel strip has a performance degradation problem, the characteristics of the steel strip need to be monitored, wherein, b4To set the threshold value, h (v)i1,…,vin) The mean value of the covariance of the resistance of the ith steel strip and the resistance of other steel strips is obtained;
comparing the variation of the same characteristic value of each steel stripTendency, the data of a certain steel strip is inconsistent with the change tendency of other steel strips, and the steel strip has the problem of performance degradation, namely when the requirement is met
And
in one of these three conditions, the m-th strip presents a degradation problem and it is necessary to monitor the strip characteristics, where c1、c2、c3To a set threshold value, rmThe resistance value of the initial layer of the mth steel strip,
the average value of the resistance values of the initial layers of all the steel strips except the m-th steel strip, vppmThe fluctuation value of the resistance of the m-th steel strip,
the average value of the resistance fluctuation values of all the steel strips except the m-th steel strip, vppmThe fluctuation value of the resistance of the m-th steel strip, SmIs the standard deviation of the resistance of the m-th steel strip,
the average value of the standard deviation of the resistances of all the steel strips except the m-th steel strip is obtained,
the resistance value of the initial layer of the mth steel strip is increased or decreased and is compared with the resistance value of other steel strips,
the resistance fluctuation value of the mth steel strip is the contrast value of the resistance fluctuation value of other steel strips,
the comparison value of the standard deviation increase and decrease trend of the resistance of the mth steel strip and other steel strips is shown.
The invention is further improved, a plurality of steel wire rope cores are arranged in the steel belt, and the method and the system for monitoring the tension and the performance degradation of the elevator traction steel belt also comprise a single steel belt detection step: injecting specific current into each steel wire rope core in a single steel belt, detecting the voltage value of each steel wire rope core in the steel belt, and then monitoring each steel wire rope core in the steel belt by adopting the steps S2-S4.
The invention also provides a system for realizing the method for monitoring the tension and the performance degradation of the elevator traction steel belt, which comprises a specific current generating source, a voltage detection module, a storage module and a data processing module, wherein the specific current generating source comprises a plurality of groups of periodic current sources which are respectively connected with the steel wire rope cores of the steel belts; the voltage detection module is used for collecting the voltage of the steel wire rope core of each steel belt and detecting the resistance of the steel wire rope core of each steel belt according to the collected specific current; and the data processing module receives the data of the voltage detection module, calculates the characteristic value, stores the characteristic value in the storage module, and judges whether the steel belts and the steel wire rope cores of the steel belts are normal or not.
The invention is further improved, and the data processing module further comprises a service life evaluation unit for comparing each characteristic value with the initial characteristic value and evaluating the service life of each steel strip according to the comparison result and the change trend.
The invention is further improved and also comprises an alarm device which is connected with the data processing module.
The elevator is further improved by the elevator control system, and the elevator control system further comprises a display module for displaying the state of each steel belt and a communication module for communicating with the elevator main control unit and uploading data of each steel belt of the elevator.
The invention is further improved, when monitoring the performance of each steel wire rope core in a single steel strip and evaluating the service life of the steel wire rope core, the specific current generating source of the embodiment also comprises a plurality of groups of periodic current sources which are respectively connected with each steel wire rope core in each steel strip; the voltage detection module is also used for collecting the voltage of each steel wire rope core in each steel strip and detecting the resistance of each steel wire rope core according to the collected specific current.
Compared with the prior art, the invention has the beneficial effects that: all steel wire rope cores of all steel belts can be monitored simultaneously; the tension variation and the tension variation trend of each steel belt can be accurately detected; and monitoring the tension unevenness and the performance degradation trend of each steel strip in real time.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a schematic view of a tension imbalance monitoring process;
FIG. 3 is a schematic diagram of a performance degradation monitoring process;
FIG. 4 is a schematic diagram of the system of the present invention;
FIG. 5 is resistance data of No. 1 steel belt wire rope core;
FIG. 6 is resistance data of No. 2 steel belt wire rope core;
fig. 7 is resistance value data of the steel cord core of No. 3 steel belt.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in figure 1, the monitoring method of the invention is that after the elevator is installed, the resistance value of the steel wire rope core in each steel belt is detected in real time by the system of the invention, the tension and the performance of the steel belt are directly related to the resistance value, the tension variation, the unevenness and the performance degradation trend of each steel belt are monitored by extracting corresponding characteristic values and analyzing the tension variation and the performance degradation condition of each steel belt by comparing the historical data of the resistance value of each steel belt. The respective steps are explained in detail below.
Step 1: injecting a specific current I into the steel wire rope core of each steel belt; in the embodiment, a specific current I is injected into the steel wire rope core of each steel belt, the specific current is set according to the resistance value of the steel belt, so that the detection voltage range is in a preset voltage range, if the detection voltage range is between 0.8V and 1.2V and the resistance value of 9 layers of elevator steel belts is about 15 omega, the current is set to 70mA, namely the detection voltage value is 1.05V.
Step 2: after injecting a specific current I, detecting the voltage value U of the steel wire rope core of each steel belt;
step 3: and calculating the resistance value R of the wire rope core of each steel belt at the moment according to the detected voltage value U and the specific current value I.
Step 4: when the monitoring method is adopted for the first time, an elevator initial layer is set, the elevator needs to run in the whole process from the initial layer to the highest position and then to the bottommost layer and return to the initial layer, the whole-process data is recorded, the characteristic values of all steel belts are calculated and stored, and the characteristic values comprise: resistance r of the initial layer0(the resistance when the elevator stops at the initial floor is a calibrated value R0) Fluctuation value vpp at runtime0Variance S0 2Standard deviation S0And covariance matrix V of each root data0；
Step 5: and setting a time period, storing the resistance data of each steel belt in the set time period when the elevator stops running to an initial layer, calculating and recording the characteristic value of each steel belt, and judging whether the steel belt has the problem of unbalanced tension.
Of course, the following two cases 2 can be adopted for detection in this example:
(1) regularly detecting (setting time according to requirements), wherein the elevator is in a maintenance state at the moment, recording whole-course data according to the whole-course operation from an initial layer to the highest position and then to the lowest layer and back to the initial layer, calculating and storing characteristic values of each steel strip, and if the data can be acquired by performing maintenance detection in a fixed few minutes every week;
(2) real-time detection, after elevator operation a period of time T, save each steel band resistance data, calculate the eigenvalue of each steel band and record, judge whether the steel band appears the unbalanced tension problem, wherein time T sets up according to the operational environment and the behavior of elevator, when the elevator is in the condition of frequent operation or operational environment is abominable, time T sets up to shorter time (like 3 hours), when the elevator is in the condition of infrequent operation or operational environment is better, time T sets up to longer time (like 8 hours).
As shown in fig. 2, the evaluation of the tension unbalance of the present example is performed according to the following steps:
step 51: calculating each steel belt according to the resistance value of each steel belt in the periodAnd recording the following characteristic values: fluctuation value vpp, variance S at runtime2Standard deviation S and covariance matrix V of each data, if the elevator stops to the initial layer in the period, recording resistance r of the initial layer;
step 52: judging whether the fluctuation value of the resistance of a certain steel belt is far larger or smaller than that of other steel belts or not in the period of time, if so, solving the problem that the tension of the steel belt is not uniform with that of other steel belts, namely
Or
The m-th steel strip has the problem of uneven tension with other steel strips, vppmRefers to the fluctuation value of the resistance of the mth steel strip,
means the average value of the resistance fluctuation values of all the steel strips (except the m-th steel strip), a1、a2The set threshold value is indicated, and the m-th steel strip has the problem of uneven tension with other steel strips;
step 53: in the period, the increasing and decreasing trends of the resistance values of the steel belts are compared to judge whether the increasing and decreasing trend of a certain steel belt is inconsistent with that of other steel belts, if so, the steel belt has the problem of uneven tension with other steel belts, namely
Rm' means the rate of change of the resistance of the m-th steel strip,
means the average value of the resistance change rates of all the steel strips (except the m-th steel strip),
the contrast value of the resistance increasing and decreasing trend of the mth steel strip and other steel strips, a3The set threshold value is indicated, and the m-th steel strip has the problem of uneven tension with other steel strips;
step 54: in the period, whether the resistance value of a certain steel belt does not fluctuate during the operation of the elevator or not occurs, if so, the steel belt has the problem of uneven tension with other steel belts, namely vppm<a4，vppmRefers to the fluctuation value of the resistance of the m-th steel strip, a4The set threshold value is indicated, and the m-th steel strip has the problem of uneven tension with other steel strips;
step 55: and when the elevator works again for the time T, storing the resistance data of each steel belt, replacing the original data, and repeating Step51-Step 55.
It should be noted that the steps Step51-Step54 can be detected in any order as long as the four detections are completed.
Step 6: and recording the characteristic value of each steel strip, detecting the trend of each characteristic, comparing each steel strip, and judging whether the steel strip has the performance degradation problem.
As shown in fig. 3, the evaluation of the performance degradation of this example is performed according to the following steps:
step 61: the variation trend of different characteristic values of the same steel strip is according to a specific rule, when the variation trend of a certain characteristic value of a certain steel strip is suddenly changed, the performance degradation problem of the steel strip occurs, namely when the g is satisfied1(rm)＞b1、g2(vppm)＞b2And g3(Sm)＞b3In one of these three conditions, the m-th strip presents a degradation problem and it is necessary to monitor the strip characteristics, where b1、b2、b3To a set threshold value, rmResistance value of initial layer of mth steel strip, vppmThe fluctuation value of the resistance of the m-th steel strip, SmStandard deviation of resistance of m-th steel strip, g1(rm)、g2(vppm)、g3(Sm) Respectively representing the variation trends of the resistance value, the fluctuation value and the standard deviation when the steel strip runs;
step 62: according to the covariance matrix
When parameters of a certain steel stripSudden changes, the steel strip has performance degradation problem, n is the total number of steel strips, vijThe covariance value of the resistances of the ith and jth steel strips is obtained when h (v)i1,…,vin)＞b4When the i-th steel strip has a performance degradation problem, the characteristics of the steel strip need to be monitored, wherein, b4To set the threshold value, h (v)i1,…,vin) The mean value of the covariance of the resistance of the ith steel strip and the resistance of the other steel strips.
Step 63: comparing the change trends of the same characteristic values of the steel strips, if the change trend of the data of a certain steel strip is inconsistent with that of other steel strips, the steel strip has the problem of performance degradation, namely, when the change trends of the data of the certain steel strip are met
And
in one of these three conditions, the m-th strip presents a degradation problem and it is necessary to monitor the strip characteristics, where c1、c2、c3To a set threshold value, rmThe resistance value of the initial layer of the mth steel strip,
the average value of the resistance values of the initial layers of all the steel strips (except the m-th steel strip), vppmThe fluctuation value of the resistance of the m-th steel strip,
the average value of the resistance fluctuation values of all steel strips (except the m-th steel strip), vppmThe fluctuation value of the resistance of the m-th steel strip, SmIs the standard deviation of the resistance of the m-th steel strip,
is the average value of the standard deviation of the resistance of all the steel strips except the m-th steel strip,
for the m-th strip to startThe increase and decrease trend of the resistance value of the layer resistor is compared with the contrast value of other steel belts,
the resistance fluctuation value of the mth steel strip is the contrast value of the resistance fluctuation value of other steel strips,
the comparison value of the standard deviation increase and decrease trend of the resistance of the mth steel strip and other steel strips is shown.
Likewise, steps 61-Step63 in this example can be detected in any order as long as the three detections are completed.
Step 7: and comparing and changing the trend according to the characteristic values and the initial characteristic values to evaluate the service life of each steel belt.
The method is not only suitable for monitoring a plurality of steel belts and different wire rope cores in the plurality of steel belts, but also suitable for monitoring different wire rope cores in one steel belt.
The invention mainly aims at the change of the bearing capacity of each dragging steel belt caused by various factors in the using process of the elevator, monitors the tension change trend and the performance degradation of each steel belt in real time and ensures the safe operation of the elevator. Through the real-time monitoring system, when the tension of each steel belt is unbalanced or the tension of the steel belt changes suddenly and the performance is degraded, the steel belt is monitored in time. When the scrapping phenomenon occurs, the elevator stops working in time and gives an alarm, and elevator maintenance personnel can accurately maintain the elevator and eliminate potential safety hazards. Under the condition of ensuring the safety of the elevator, the resources are utilized to the maximum, and an important basis is provided for workers to overhaul, maintain the elevator and evaluate the service life of the elevator.
The invention also provides a system for realizing the method for monitoring the tension and the performance degradation of the elevator traction steel belt, which comprises a specific current generating source, a voltage detection module, a storage module and a data processing module, wherein the specific current generating source comprises a plurality of groups of periodic current sources which are respectively connected with the steel wire rope cores of the steel belts; the voltage detection module is used for collecting the voltage of the steel wire rope core of each steel belt and detecting the resistance of the steel wire rope core of each steel belt according to the collected specific current; and the data processing module receives the data of the voltage detection module, calculates the characteristic value, stores the characteristic value in the storage module, and judges whether the steel belts and the steel wire rope cores of the steel belts are normal or not. Preferably, the data processing module further comprises a service life evaluation unit for comparing each characteristic value with the initial characteristic value and evaluating the service life of each steel strip according to the comparison result and the variation trend.
The embodiment also comprises an alarm device which is connected with the data processing module. The elevator control system also comprises a display module for displaying the state of each steel belt and a communication module for communicating with the elevator main control unit and uploading data of each steel belt of the elevator.
As shown in fig. 4, one end of the elevator traction steel belt 4 of this example is fixed by a fixing structure 1, and the other end is connected to a specific current generation source and voltage detection module 2, which are connected to a data processing device 3.
The specific current generating source comprises a plurality of groups of precise periodic current sources, and the precise periodic current sources are injected into the steel wire rope cores of the steel belts; the voltage detection module comprises a plurality of groups of voltage signal acquisition circuits for acquiring the voltage of each steel belt steel wire rope core and detecting the resistance of each steel belt steel wire rope core according to the voltage and a specific current value.
The data processing device 3 is internally provided with processing software, and a data processing module, a display module, an alarm device and a communication module are integrated on hardware. The storage module of the embodiment can be provided with an independent storage unit in the data processing device, and can also upload data to the elevator main control unit or the elevator operation detection system for storage; in addition, the alarm unit of the embodiment can also be directly connected to the elevator main control unit, and when the steel belt has a problem, the elevator stops working.
As shown in fig. 5 to 7, the resistance value data of the steel belt wire rope core No. 1 to 3 when a certain elevator is in operation, wherein the ordinate is the resistance value and the abscissa is the detection time. When the elevator is in operation, the resistance values of the 3 steel belt steel wire rope cores are jittered, and when the elevator stops at a certain floor, the resistance values are in a certain value. As shown in fig. 6 and 7, the tendency of the No. 2 steel strip and the No. 3 steel strip to flutter was consistent, and the No. 1 steel strip in fig. 5 was inconsistent with the No. 2 and No. 3 steel strips, indicating that the No. 1 steel strip had a problem. In the embodiment, the resistance values of the steel belts are collected every 1S, wherein the resistance value of the steel belt No. 1 is [15.795,15.795, …,15.798,15.798], as shown in fig. 5, the resistance value of the No. 2 steel strip is [15.612,15.611, …,15.612,15.612], as shown in fig. 6, the resistance value of the No. 3 steel strip is [15.374,15.374, …,15.379,15.379], as shown in fig. 7, the covariance calculation of the resistance value of the steel strip No. 1 and the resistance value of the steel strip No. 2 f (1,2) — 0.0106, the covariance calculation of the resistance value of the steel strip No. 2 and the resistance value of the steel strip No. 3 f (2,3) — 0.0551, the covariance calculation of the resistance value of the steel strip No. 1 and the resistance value of the steel strip No. 3 f (1,3) — 0.0117, step62 according to the invention, steel strip number 1 had a negative relationship to steel strips numbers 2 and 3, therefore, the tendency is different, and the No. 1 steel strip has the problems of tension imbalance and performance degradation with other steel strips. Of course, the time interval for collecting data can be set according to requirements, and the shorter the interval time is, the more accurate the calculated result is.
The invention has the following beneficial effects:
1) by adopting the monitoring method and the monitoring system, the wire rope cores of all steel belts can be monitored simultaneously;
2) the monitoring method and the system can accurately detect the tension variation of each steel belt;
3) the monitoring method and the monitoring system can monitor the change trend of the tension of each steel strip in real time;
4) by adopting the monitoring method and the system, the tension unevenness of each steel belt can be monitored in real time;
5) the monitoring method and the monitoring system can monitor the performance degradation trend of each steel strip in real time;
6) the monitoring method and the system can be used for prejudging the service life of the steel belt;
7) the monitoring method and the monitoring system are convenient to calculate on the basis of ensuring the measurement precision.
The above-described embodiments are intended to be illustrative, and not restrictive, of the invention, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. The method for monitoring the tension and the performance degradation of the elevator traction steel belt is characterized by comprising the following steps of:
s1: injecting a specific current I into the steel wire rope core of each steel belt, and detecting the voltage value U of the steel wire rope core of each steel belt;
s2: the elevator is operated for the next period, and the initial characteristic value of the steel wire rope core of each steel belt in the initial state of the elevator is calculated and recorded;
s3: when the elevator runs, acquiring whole-course data in a set time period, calculating and storing characteristic values of the steel wire rope cores of all the steel belts;
s4: judging whether the steel wire rope cores of all the steel belts of the elevator have the problems of unbalanced tension or degraded performance of the steel belts according to the characteristic values;
in step S2, an elevator operation initial floor is set, a period is such that the elevator goes from the initial floor to the highest floor to the lowest floor and then back to the initial floor, and the initial characteristic value includes the resistance value r of the wire rope core of each steel strip of the initial floor0Fluctuation value of resistance at run time vpp0Variance S0 2Standard deviation S0And the covariance matrix V of the resistance data of each steel strip0，
In step S3, the feature values include: resistance r of initial layer resistor, fluctuation value vpp and variance S of resistor during operation2A standard deviation S and a covariance matrix V of resistance data of each steel strip,
in step S4, the method for judging the tension unbalance of the steel strip includes:
in the period, the fluctuation value of the resistance of a certain steel belt is far larger or smaller than that of other steel belts, and the steel belt has the problem of uneven tension with other steel belts, namely
The m-th strip has a problem of uneven tension with other strips, vppmRefers to the fluctuation value of the resistance of the mth steel strip,
means the average value of the resistance fluctuation values of all the steel strips except the m-th steel strip, a1A set threshold value is designated;
in this period, the increasing and decreasing trend of the resistance value of each steel strip is compared, the increasing and decreasing trend of a certain steel strip is inconsistent with that of other steel strips, and the tension of the steel strip is not uniform with that of other steel strips, namely the steel strip has the problem that the tension of the steel strip is not uniform
The m-th steel strip has the problem of uneven tension with other steel strips,
refers to the rate of change of the resistance of the mth steel strip,
means the average value of the resistance change rates of all the steel strips except the m-th steel strip,
the contrast value of the resistance increasing and decreasing trend of the mth steel strip and other steel strips, a3A set threshold value is designated;
during the period, when the resistance value of a certain steel belt does not fluctuate during the operation of the elevator, the steel belt has the problem of uneven tension with other steel belts, namely vppm<a4The m-th strip has a problem of uneven tension with other strips, vppmRefers to the fluctuation value of the resistance of the m-th steel strip, a4Refers to a set threshold.
2. The method for monitoring the tension and performance degradation of an elevator traction steel belt according to claim 1, wherein the method comprises the steps of: further comprising step S5: and comparing each characteristic value with the initial characteristic value, and evaluating the service life of each steel strip according to the comparison result and the change trend.
3. The method for monitoring the tension and performance degradation of the elevator traction steel belt according to claim 1 or 2, wherein: the method for monitoring the tension and the performance degradation of the elevator traction steel belt further comprises the following steps: injecting specific current into each steel wire rope core in a single steel belt, detecting the voltage value of each steel wire rope core in the steel belt, and then monitoring each steel wire rope core in the steel belt in real time by adopting the steps S2-S4.
4. The system for realizing the method for monitoring the tension and the performance degradation of the elevator traction steel belt according to any one of claims 1 to 3 is characterized in that: the device comprises a specific current generating source, a voltage detection module, a storage module and a data processing module, wherein the specific current generating source comprises a plurality of groups of periodic current sources which are respectively connected with the steel wire rope cores of all steel belts; the voltage detection module is used for collecting the voltage of the steel wire rope core of each steel belt and detecting the resistance of the steel wire rope core of each steel belt according to the voltage and the specific current; and the data processing module receives the data of the voltage detection module, calculates the characteristic value, stores the characteristic value in the storage module, and judges whether the steel belts and the steel wire rope cores of the steel belts are normal or not.
5. The system of claim 4, wherein: the data processing module also comprises a service life evaluation unit which is used for comparing each characteristic value with the initial characteristic value and evaluating the service life of each steel strip according to the comparison result and the change trend.
6. The system according to claim 4 or 5, characterized in that: the elevator monitoring system further comprises an alarm device, a display module and a communication module, wherein the alarm device is connected with the data processing module, the display module is used for displaying the state of each steel belt, and the communication module is communicated with the elevator main control unit and uploads the data of each steel belt of the elevator.
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| CN113401752A (en) * | 2020-03-16 | 2021-09-17 | 奥的斯电梯公司 | Method and device for detecting the condition of a surface insulation layer of an elevator traction belt |
| CN111606169B (en) * | 2020-05-06 | 2021-12-28 | 西人马联合测控（泉州）科技有限公司 | Method, device and system for detecting faults of traction ropes of elevator car |
| CN111620217A (en) * | 2020-07-07 | 2020-09-04 | 广东卓梅尼技术股份有限公司 | Elevator steel wire rope fault determination method and system based on tension monitoring technology |
| CN111847169A (en) * | 2020-07-31 | 2020-10-30 | 河池学院 | Elevator traction steel wire rope state monitoring and early warning system and method based on algorithm model |
| CN112966225B (en) * | 2021-03-22 | 2023-03-31 | 南昌航空大学 | Steel wire rope safety life assessment method based on normal distribution |
| CN113086792B (en) * | 2021-03-26 | 2022-05-03 | 广州广日电梯工业有限公司 | Maintenance method for elevator traction member and maintenance device for elevator traction member |
| CN114803763B (en) * | 2022-06-30 | 2022-09-09 | 锐创软件技术(启东)有限公司 | Variable speed goods elevator abnormity detection method based on neural network |
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| IN2014DN08262A (en) * | 2012-04-02 | 2015-05-15 | Otis Elevator Co | |
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