CN116873681A - Correction method of linear weighing device for elevator - Google Patents
Correction method of linear weighing device for elevator Download PDFInfo
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- CN116873681A CN116873681A CN202310852759.1A CN202310852759A CN116873681A CN 116873681 A CN116873681 A CN 116873681A CN 202310852759 A CN202310852759 A CN 202310852759A CN 116873681 A CN116873681 A CN 116873681A
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- 238000005303 weighing Methods 0.000 title claims abstract description 107
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000012937 correction Methods 0.000 title claims abstract description 13
- 238000012423 maintenance Methods 0.000 claims abstract description 62
- 238000009434 installation Methods 0.000 claims abstract description 9
- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 238000004364 calculation method Methods 0.000 claims description 16
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- 238000001514 detection method Methods 0.000 description 8
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- 229960002485 trolnitrate Drugs 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
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Classifications
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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
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Abstract
The invention discloses a correction method of a linear weighing device for an elevator, which is characterized in that the initial relation between the output value of the weighing device and the load rate of an elevator car and the initial relation between the load rate of the elevator car and a zero-speed maintenance torque current value are measured in the installation stage of the elevator; after the elevator runs for a preset period, monitoring whether the output value of the current weighing device when the elevator car load factor is 0 exceeds a preset range, and correcting the relation between the output value of the weighing device and the elevator car load factor and the relation between the elevator car load factor and the zero-speed maintenance torque current value if the output value exceeds the preset range. Compared with the prior art, the linear fitting method is convenient, the calculated amount is very small, and the correction can be performed by simply calculating only by reading the output value of the weighing device and the torque current value of the elevator car when the load is maintained at zero speed by the elevator driving device.
Description
Technical Field
The invention relates to the technical field of elevators, in particular to a correction method of a linear weighing device for an elevator
Background
The weighing device used in the elevator is mostly characterized in that a tiny mechanical deformation detection value is used for carrying out linear fitting with the load of the elevator car, and the tiny deformation detection value is used for representing the load change of the elevator car.
In the elevator installation adjustment stage, the linear fitting of the micro mechanical deformation detection value and the elevator car load is better, but after a period of use, the micro mechanical deformation detection value caused by the elevator car load change can deviate, and the detection precision of the elevator car load is directly affected. This is mainly related to the following reasons:
1. the micro deformation value is related to the ambient temperature, and the deformation amount can change along with the change of the ambient temperature;
2. because the self weight of the elevator car is relatively large, the measured deformation standard object is compressed or stretched for a long time, and the offset of the detection value when the elevator car is loaded gradually drifts;
3. as the service life of the elevator increases, the components are aged gradually, and the slope of the linear fit of the aged micro mechanical deformation detection value and the elevator car load changes.
For the above problems, the conventional technical solution to solve the problems is to calibrate the weighing device and correct the weighing device by a driving algorithm at regular intervals.
The existing driving algorithm corrects as follows:
CN 109850712A and CN 110316629A use a plurality of coefficients of a preset set of error adjustment estimation formulas, and adjust the plurality of preset coefficients through an adaptive algorithm, where the adjustment calculation process is complex, and there is partial coupling between the coefficients, so that it is difficult to achieve the expected effect. This method is not only a calibration of the weighing device, but also involves calculation of deviations in other elevator traction systems. And the variation of the elevator load is random, if the method is adopted, the calculated amount is huge, the coefficient variation is frequent, and the control stability is not facilitated.
It is therefore an object of the present invention to provide a method for correcting a linear weighing device that is computationally simple.
Disclosure of Invention
In order to solve the technical problems, the invention provides a correction method of a linear weighing device for an elevator, which is used for measuring the initial relation between the output value of the weighing device and the load rate of an elevator car and the initial relation between the load rate of the elevator car and a zero-speed maintenance torque current value in an elevator installation stage; after the elevator runs for a preset period, monitoring whether the output value of the current weighing device when the elevator car load factor is 0 exceeds a preset range, and correcting the relation between the output value of the weighing device and the elevator car load factor and the relation between the elevator car load factor and the zero-speed maintenance torque current value if the output value exceeds the preset range.
Preferably, the initial relation between the output value of the weighing device and the load rate of the elevator car and the initial relation between the load rate of the elevator car and the zero-speed maintenance torque current value are measured in the elevator installation stage;
step S1, measuring a weighing device output value W0 and a zero-speed maintenance torque current value Iz0 when the load factor of the elevator car is 0;
step S2, measuring a weighing device output value W1 and a zero-speed maintenance torque current value Iz1 when the load ratio of the elevator car is L1, wherein 0< L1< Lb, preferably 0< L1<0.3;
step S3, measuring a weighing device output value W2 and a zero-speed maintenance torque current value Iz2 when the load ratio of the elevator car is L2, wherein 1> L2> Lb, preferably 1> L2>0.6;
step S4, measuring a weighing device output value WL and a zero-speed maintenance torque current value IzL when the elevator car load factor is 1;
step S5, calculating a first linear coefficient K1 and a second linear coefficient K2;
step S6, calculating the weighing device output value Wb and the zero-speed maintaining torque current value Izb when the car load factor is Lb.
Preferably, in said step S5, the first linear coefficient K1 is calculated as follows: k1 -L1/(Iz 0-Iz 1); wherein Iz0 is a zero-speed maintenance torque current value when the elevator car load factor is 0, and Iz1 is a zero-speed maintenance torque current value when the elevator car load factor is L1; the calculation formula of the second linear coefficient K2 is as follows: k2 = (L2-1)/(Iz 2-IzL); wherein IzL is a zero-speed maintenance torque current value when the elevator car load factor is 1, iz2 is a zero-speed maintenance torque current value when the elevator car load factor is L2, and IzL is a zero-speed maintenance torque current value when the elevator car load factor is 1; the calculation formula of the value of the elevator car load rate L1 is as follows: l1= (W1-W0)/(WL-W0), where W1 is the weighing device output value when the elevator car load factor is L1, W0 is the weighing device output value when the elevator car load factor is 0, WL is the weighing device output value when the elevator car load factor is 1; the calculation formula of the value of the elevator car load rate L2 is as follows: l2= (W2-W0)/(WL-W0), where W2 is the weighing device output value at an elevator car load factor L2.
Preferably, in the step S6, the calculation formula of the zero-speed maintenance torque current value Izb is: izb = (1+k1×iz0-k2× IzL)/(K1-K2), where Iz0 is a zero-speed maintenance torque current value at an elevator car load factor of 0, and IzL is a zero-speed maintenance torque current value at an elevator car load factor of 1; the calculation formula of the weighing device output value Wb when the car load factor is Lb is: wb=lb (WL-W0), lb=k1 (1+k2×iz0-k2× IzL)/(K1-K2).
Preferably, the specific method for monitoring whether the current output value of the weighing device exceeds the preset range when the load rate of the elevator car is 0 is as follows: when the elevator car is determined to be in an empty load state, reading the current output value W0t of the weighing device when the elevator car load factor is 0; when the absolute value of W0t-W0, |/(WL-W0) is 100 percent more than or equal to DeltaL 0, wherein 10 percent is more than DeltaL 0 and more than 1 percent, the weighing device needs to be corrected; the correction of the weighing device means that the values of W0, wb and WL are corrected and changed, and a new relation curve of the output value of the weighing device and the load rate of the elevator car is formed.
Preferably, the method of correcting W0 is to store W0t directly as W0.
Preferably, the steps of the method of correcting Wb and WL values are as follows:
step T1, measuring a zero-speed maintenance torque current value Izt1 when the load factor of the elevator car is Lt1, wherein Lb is more than Lt1 and more than eta 1, and estimating a weighing device output value Lt1g when the load factor of the elevator car is Lt1 according to the following formula;
Lt1g＝K1*(Izt-Iz0)；Lt1＝(Wt1-W0)/(WL-W0)；
when |Lt1g-Lt1| < DeltaLm, the WL value remains unchanged;
when |Lt1g-Lt1|is not less than ΔLm, the corrected first linear coefficient K1g is calculated according to the following formula:
K1g＝Lt1/(Izt1-Iz0)；
replacing the original K1 with K1g, and calculating Wbg value according to the following formula;
Wbg＝-K1g*(Iz0-Izb)*(WL-W0)+W0；
wbg instead of Wb; wherein 40% > eta 1> 30%,10% > DeltaLm > 1%;
step T2, measuring a zero-speed maintenance torque current value Izt2 when the load factor of the elevator car is Lt2, wherein eta 2 is larger than Lt2 and larger than Lb, and estimating a weighing device output value Lt2g when the load factor of the elevator car is Lt2 according to the following formula;
Lt2g＝K2*(Izt2-IzL)+1；Lt2＝(Wt2-W0)/(WL-W0)；
when |Lt2g-Lt2| < DeltaLm, the WL value remains unchanged;
when |Lt2g-Lt2|ΔLm is not less than, the coefficient K2g is calculated according to the following formula:
K2g＝(Lb-Lt2)/(Izb-Izt2)；
replacing original K2 with K2g, and calculating WLg value according to the following formula;
WLg＝(Wb-W0)/(-K2g*(IzL-Izb)+1)+W0；
WLg instead of WL; wherein 70% > eta 2> 50%,10% > DeltaLm > 1%.
Compared with the prior art, the invention has the advantages of convenient linear fitting and little calculated amount, and can correct by simply calculating only the output value of the weighing device and the torque current value of the elevator car when the elevator driving device reads the load zero-speed maintenance. In the process of correcting the weighing device, the difference value between the zero-speed maintaining current under the current load and the zero-speed current under the no-load or full-load state is utilized to calculate, so that complicated parameters and calculations such as steel wire rope compensation and friction force compensation are not involved, and in the process of initializing the weighing device, when the weight is utilized to adjust the load of the lift car, the position of the lift car is not required, namely the calibration operation of the weighing device is not needed in the middle layer, and the labor is greatly saved. The invention is simple and easy to implement, not only can correct the offset of the weighing device, but also can correct the change of the measurement slope of the linear weighing device in a preferred embodiment.
Drawings
The invention is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a graph of weighing device output versus elevator car load factor;
fig. 2 is a graph of elevator car load factor versus zero speed maintenance torque current value.
Detailed Description
Other advantages and technical effects of the present invention will become more fully apparent to those skilled in the art from the following disclosure, which is a detailed description of the present invention given by way of specific examples. The invention may be practiced or carried out in different embodiments, and details in this description may be applied from different points of view, without departing from the general inventive concept. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. The following exemplary embodiments of the present invention may be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. It should be appreciated that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the technical solution of these exemplary embodiments to those skilled in the art.
The basic principle of a traction elevator system is that a car and a counterweight are suspended on a traction machine by suspension ropes, and the car is operated by controlling the rotation of the traction machine.
The following description and definitions will be applied to the method of correcting a linear weighing device for an elevator of this embodiment.
The elevator car load factor is the ratio of the load in the elevator car to the rated load of the elevator car.
The load rate of the elevator car is 0, which indicates that the inside of the car is empty; the load ratio of the elevator car is 1, which indicates that the load in the car is rated load; the elevator car load factor Lb represents the balance load (such as the mass of the car side, the counterweight side and the like) in the elevator car, and Lb is a commonly-called balance coefficient in the field; the balance factor Lb set after installation of the elevator is usually between 0.4 and 0.5.
The linear weighing device output value is related to the elevator car load factor as shown in fig. 1: w0 is a weighing device output value when the elevator car load factor is 0, WL is a weighing device output value when the elevator car load factor is 1, W1 is a weighing device output value when the elevator car load factor is L1, and W2 is a weighing device output value when the elevator car load factor is L2.
The zero-speed maintenance torque current value refers to a torque current value at which the traction machine drives the car to maintain zero speed when the traction machine band-type brake is opened.
When the elevator is installed and the balance load is adjusted, the corresponding zero-speed maintenance torque current value is provided under different elevator car load rates. The relationship between the elevator car load factor and the zero-speed maintenance torque current value is shown in fig. 2, in which the abscissa is the elevator car load factor and the ordinate is the zero-speed maintenance torque current value. The curve takes the load rate Lb of the elevator car as a demarcation point to form two sections of linear relations. The linear relationship of the elevator car load ratio less than the Lb portion is defined as a first linear coefficient K1 and the linear relationship of the elevator car load ratio greater than the Lb portion is defined as a second linear coefficient K2.
Iz0 is a zero-speed maintenance torque current value when the elevator car load factor is 0; izL is a zero-speed maintenance torque current value at an elevator car load factor of 1; izb is a zero-speed maintenance torque current value at an elevator car load factor Lb; iz1 is a zero-speed maintenance torque current value when the elevator car load factor is L1, wherein 0< L1< Lb; iz2 is a zero-speed maintenance torque current value at an elevator car load factor L2, where 1> L2> Lb.
The embodiment provides a correction method of a linear weighing device for an elevator, which is used for measuring an initial relation between an output value of the weighing device and a load rate of an elevator car and an initial relation between the load rate of the elevator car and a zero-speed maintenance torque current value in an elevator installation stage; after the elevator runs for a preset period, monitoring whether the output value of the current weighing device when the elevator car load factor is 0 exceeds a preset range, and correcting the relation between the output value of the weighing device and the elevator car load factor and the relation between the elevator car load factor and the zero-speed maintenance torque current value if the output value exceeds the preset range.
More specifically, the initial relationship between the output value of the weighing device and the load factor of the elevator and the initial relationship between the load factor of the elevator and the zero-speed maintenance torque current value are measured at the stage of elevator installation.
Step S1, measuring a weighing device output value W0 and a zero-speed maintenance torque current value Iz0 when the load factor of the elevator car is 0;
step S2, measuring a weighing device output value W1 and a zero-speed maintenance torque current value Iz1 when the load ratio of the elevator car is L1, wherein 0< L1< Lb, preferably 0< L1<0.3;
step S3, measuring a weighing device output value W2 and a zero-speed maintenance torque current value Iz2 when the load ratio of the elevator car is L2, wherein 1> L2> Lb, preferably 1> L2>0.6;
step S4, measuring a weighing device output value WL and a zero-speed maintenance torque current value IzL when the elevator car load factor is 1;
step S5, calculating a first linear coefficient K1 and a second linear coefficient K2;
the first linear coefficient K1 is calculated as follows:
k1 -L1/(Iz 0-Iz 1); where Iz0 is the zero speed maintenance torque current value when the elevator car load factor is 0, and Iz1 is the zero speed maintenance torque current value when the elevator car load factor is L1, where 0< L1< Lb.
The calculation formula of the second linear coefficient K2 is as follows
K2 = (L2-1)/(Iz 2-IzL); wherein IzL is a zero-speed maintenance torque current value at an elevator car load factor of 1, and Iz2 is a zero-speed maintenance torque current value at an elevator car load factor of L2, wherein 1> L2> lb.
The calculation formula of the value of the elevator car load rate L1 is as follows: l1= (W1-W0)/(WL-W0), where W1 is the weighing device output value when the elevator car load factor is L1, W0 is the weighing device output value when the elevator car load factor is 0, and WL is the weighing device output value when the elevator car load factor is 1.
The calculation formula of the value of the elevator car load rate L2 is as follows: l2= (W2-W0)/(WL-W0), where W2 is the weighing device output value at an elevator car load factor L2.
Step S6, calculating the weighing device output value Wb and the zero-speed maintaining torque current value Izb when the car load factor is Lb. The corresponding calculation formula is as follows:
Izb＝(1+K1*Iz0-K2*IzL)/(K1-K2)
Lb＝K1*(1+K2*Iz0-K2*IzL)/(K1-K2)
Wb＝Lb*(WL-W0)
the respective values measured by the above steps and the calculated respective values can form a graph of the relationship between the output value of the weighing device and the load factor of the elevator car and a graph of the relationship between the load factor of the elevator car and the zero-speed maintenance torque current value.
The specific method for monitoring whether the output value of the current weighing device exceeds the preset range when the load rate of the elevator car is 0 is as follows:
when the elevator car is determined to be in an empty load state, reading the current output value W0t of the weighing device when the elevator car load factor is 0;
when |W0t-W0|/(WL-W0). Times.100% is equal to or greater than ΔL0, 10% is greater than ΔL0 is greater than 1%, and the weighing device needs to be corrected. The correction of the weighing device means that the values of W0, wb and WL are changed to form a new relation curve of the output value of the weighing device and the load factor of the elevator car.
Correcting W0 can directly store W0t as W0;
the method of correcting Wb and WL is as follows:
a simple method is to change the values of WL and Wb according to the following formula, wl=wl+ (w0t—w0), wb=wb+ (w0t—w0).
However, since the first linear coefficient K1 and the second linear coefficient K2 may also change, the correction accuracy is not high in the simple method, and a method with higher correction accuracy may be adopted, in which the relationship between the output value of the weighing device and the load factor of the elevator car is corrected, and the relationship between the load factor of the elevator car and the zero-speed maintenance torque current value is corrected, as follows.
Step T1, determining a zero-speed maintenance torque current value Izt1 at an elevator car load factor Lt1, wherein Lb > Lt 1> η1, and estimating a weighing device output value Lt1g at an elevator car load factor Lt1 according to the following formula
Lt1g＝K1*(Izt-Iz0)
Lt1＝(Wt1-W0)/(WL-W0)
When |Lt1g-Lt1| < DeltaLm, the WL value remains unchanged;
when |Lt1g-Lt1|is not less than ΔLm, the corrected first linear coefficient K1g is calculated according to the following formula:
K1g＝Lt1/(Izt1-Iz0)
k1g was used instead of the original K1 and Wbg value was calculated according to the following formula
Wbg＝-K1g*(Iz0-Izb)*(WL-W0)+W0
Wbg was used instead of Wb.
Wherein 40% > eta 1> 30%,10% > DeltaLm > 1%.
Step T2, measuring the zero-speed maintenance torque current value Izt2 at an elevator car load factor Lt2, where η2> Lt 2> Lb, and estimating the weighing device output value Lt2g at an elevator car load factor Lt2 according to the following formula
Lt2g＝K2*(Izt2-IzL)+1
Lt2＝(Wt2-W0)/(WL-W0)
When |Lt2g-Lt2| < DeltaLm, the WL value remains unchanged;
when |Lt2g-Lt2|ΔLm is not less than, the coefficient K2g is calculated according to the following formula:
K2g＝(Lb-Lt2)/(Izb-Izt2)
k2g was used instead of the original K2 and WLg value was calculated according to the following formula
WLg＝(Wb-W0)/(-K2g*(IzL-Izb)+1)+W0
WLg replaces WL.
Wherein 70% > eta 2> 50%,10% > DeltaLm > 1%.
Preferably, under the normal service condition of the elevator, the method for judging that the elevator car is empty comprises the following steps: the elevator traction machine does not start and stop in the time T, the change range of the load rate of the elevator car calculated according to the detection value of the weighing device is smaller than a preset threshold value eta min, T is preferably more than 1 minute, and eta min is preferably less than 1 percent.
The change of the output value of the linear weighing device is gradual, and when the output value of the linear weighing device estimated according to the zero-speed maintenance current of the elevator car is particularly large in difference with the actual output value, the linear weighing device can be judged to be faulty, namely the following conditions are met:
when | Wtg-Wt|/(WL-W0). Gtoreq.100%. Gtoreq.DELTA.Lm (max), wherein DELTA.Lm (max) is equal to or greater than 5%
The deviation between the measured value of the linear weighing device and the initialized measured value W0i is limited in a certain range when the linear weighing device is in idle load, and the weighing device is judged to be in fault or the elevator car load is permanently changed when the deviation is excessive, namely when the following conditions are met:
when 100% is equal to or greater than ΔL0i (max), ΔL0t-W0i|/(WL-W0) |100%, wherein ΔL0max is equal to or greater than 25%.
The present invention has been described in detail by way of specific embodiments and examples, but these should not be construed as limiting the invention. Many variations and modifications may be made by one skilled in the art without departing from the principles of the invention, which is also considered to be within the scope of the invention.
Claims (9)
1. A method for correcting a linear weighing device for an elevator is characterized by comprising the following steps of:
measuring an initial relation between an output value of the weighing device and an elevator car load factor and an initial relation between the elevator car load factor and a zero-speed maintenance torque current value in an elevator installation stage;
after the elevator runs for a preset period, monitoring whether the output value of the current weighing device when the elevator car load factor is 0 exceeds a preset range, and correcting the relation between the output value of the weighing device and the elevator car load factor and the relation between the elevator car load factor and the zero-speed maintenance torque current value if the output value exceeds the preset range.
2. The method for correcting a linear weighing apparatus for an elevator according to claim 1, wherein the initial relation between the output value of the weighing apparatus and the load factor of the elevator and the initial relation between the load factor of the elevator and the zero-speed maintenance torque current value are measured at the stage of installation of the elevator;
step S1, measuring a weighing device output value W0 and a zero-speed maintenance torque current value Iz0 when the load factor of the elevator car is 0;
step S2, measuring a weighing device output value W1 and a zero-speed maintenance torque current value Iz1 when the load factor of the elevator car is L1, wherein 0< L1< Lb;
step S3, measuring a weighing device output value W2 and a zero-speed maintenance torque current value Iz2 when the load factor of the elevator car is L2, wherein 1> L2> Lb;
step S4, measuring a weighing device output value WL and a zero-speed maintenance torque current value IzL when the elevator car load factor is 1;
step S5, calculating a first linear coefficient K1 and a second linear coefficient K2;
step S6, calculating the weighing device output value Wb and the zero-speed maintaining torque current value Izb when the car load factor is Lb.
3. The correction method of a linear weighing apparatus for an elevator according to claim 2, wherein in said step S5, a first linear coefficient K1 is calculated as follows:
k1 -L1/(Iz 0-Iz 1); wherein Iz0 is a zero-speed maintenance torque current value when the elevator car load factor is 0, and Iz1 is a zero-speed maintenance torque current value when the elevator car load factor is L1;
the calculation formula of the second linear coefficient K2 is as follows:
k2 = (L2-1)/(Iz 2-IzL); wherein IzL is a zero-speed maintenance torque current value when the elevator car load factor is 1, iz2 is a zero-speed maintenance torque current value when the elevator car load factor is L2, and IzL is a zero-speed maintenance torque current value when the elevator car load factor is 1;
the calculation formula of the value of the elevator car load rate L1 is as follows: l1= (W1-W0)/(WL-W0), where W1 is the weighing device output value when the elevator car load factor is L1, W0 is the weighing device output value when the elevator car load factor is 0, WL is the weighing device output value when the elevator car load factor is 1;
the calculation formula of the value of the elevator car load rate L2 is as follows: l2= (W2-W0)/(WL-W0), where W2 is the weighing device output value at an elevator car load factor L2.
4. The method according to claim 2, wherein in the step S6, the zero-speed maintaining torque current value Izb is calculated by the following equation: izb = (1+k1×iz0-k2× IzL)/(K1-K2), where Iz0 is a zero-speed maintenance torque current value at an elevator car load factor of 0, and IzL is a zero-speed maintenance torque current value at an elevator car load factor of 1;
the calculation formula of the weighing device output value Wb when the car load factor is Lb is: wb=lb (WL-W0), lb=k1 (1+k2×iz0-k2× IzL)/(K1-K2).
5. The method for correcting a linear weighing apparatus for an elevator according to claim 2, wherein the specific method for monitoring whether the current weighing apparatus output value at the time of 0 load factor of the elevator car exceeds the preset range is as follows:
when the elevator car is determined to be in an empty load state, reading the current output value W0t of the weighing device when the elevator car load factor is 0; when the absolute value of W0t-W0, |/(WL-W0) is 100 percent more than or equal to DeltaL 0, wherein 10 percent is more than DeltaL 0 and more than 1 percent, the weighing device needs to be corrected;
the correction of the weighing device means that the values of W0, wb and WL are corrected and changed, and a new relation curve of the output value of the weighing device and the load rate of the elevator car is formed.
6. The method of correcting a linear weighing apparatus for an elevator according to claim 5, wherein the method of correcting W0 is to store W0t directly as W0.
7. The method for correcting a linear scale for an elevator according to claim 5, wherein the method for correcting Wb and WL values comprises the steps of:
step T1, measuring a zero-speed maintenance torque current value Izt1 when the load factor of the elevator car is Lt1, wherein Lb is more than Lt1 and more than eta 1, and estimating a weighing device output value Lt1g when the load factor of the elevator car is Lt1 according to the following formula;
Lt1g＝K1*(Izt-Iz0)；
Lt1＝(Wt1-W0)/(WL-W0)；
when |Lt1g-Lt1| < DeltaLm, the WL value remains unchanged;
when |Lt1g-Lt1|is not less than ΔLm, the corrected first linear coefficient K1g is calculated according to the following formula:
K1g＝Lt1/(Izt1-Iz0)；
replacing the original K1 with K1g, and calculating Wbg value according to the following formula;
Wbg＝-K1g*(Iz0-Izb)*(WL-W0)+W0；
wbg instead of Wb;
wherein 40% > eta 1> 30%,10% > DeltaLm > 1%;
step T2, measuring a zero-speed maintenance torque current value Izt2 when the load factor of the elevator car is Lt2, wherein eta 2 is larger than Lt2 and larger than Lb, and estimating a weighing device output value Lt2g when the load factor of the elevator car is Lt2 according to the following formula;
Lt2g＝K2*(Izt2-IzL)+1；
Lt2＝(Wt2-W0)/(WL-W0)；
when |Lt2g-Lt2| < DeltaLm, the WL value remains unchanged;
when |Lt2g-Lt2|ΔLm is not less than, the coefficient K2g is calculated according to the following formula:
K2g＝(Lb-Lt2)/(Izb-Izt2)；
replacing original K2 with K2g, and calculating WLg value according to the following formula;
WLg＝(Wb-W0)/(-K2g*(IzL-Izb)+1)+W0；
WLg instead of WL;
wherein 70% > eta 2> 50%,10% > DeltaLm > 1%.
8. The method for correcting a linear weighing apparatus for an elevator according to claim 5, wherein the method for determining that the elevator car is in an empty state is such that the elevator hoisting machine does not start or stop for a time T, and the range of change in car load factor calculated from the detected value of the weighing apparatus is smaller than a preset threshold ηmin.
9. The method for correcting a linear weighing apparatus for an elevator according to claim 2, wherein 0< l1<0.3,1> l2>0.6.
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