CN116772997A - Belt scale weighing error compensation method - Google Patents
Belt scale weighing error compensation method Download PDFInfo
- Publication number
- CN116772997A CN116772997A CN202310820983.2A CN202310820983A CN116772997A CN 116772997 A CN116772997 A CN 116772997A CN 202310820983 A CN202310820983 A CN 202310820983A CN 116772997 A CN116772997 A CN 116772997A
- Authority
- CN
- China
- Prior art keywords
- belt
- current
- belt scale
- error
- scale
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000005303 weighing Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 230000005484 gravity Effects 0.000 claims abstract description 8
- 238000007665 sagging Methods 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000011478 gradient descent method Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000003068 static effect Effects 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 5
- 238000012795 verification Methods 0.000 description 4
- 241000950638 Symphysodon discus Species 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- HOQADATXFBOEGG-UHFFFAOYSA-N isofenphos Chemical group CCOP(=S)(NC(C)C)OC1=CC=CC=C1C(=O)OC(C)C HOQADATXFBOEGG-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Landscapes
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention relates to a belt scale weighing error compensation method, which comprises the following steps: s1, establishing a typical data set, wherein the typical data set comprises n groups of typical belt scale data, and the ith group of typical belt scale data comprises a belt speed difference delta V i Belt sag Δh i Load gravity carrier roller spacing ratio p i And belt balance metering error g i The method comprises the steps of carrying out a first treatment on the surface of the S2, acquiring current data of the belt scale, wherein the current data of the belt scale comprises a current belt speed difference delta V b Current belt sag Δh b Current load gravity idler spacing ratio p b And the current measurement value G of the belt scale b The method comprises the steps of carrying out a first treatment on the surface of the S3, calculating the error compensation value e of the current belt scale b The method comprises the steps of carrying out a first treatment on the surface of the S4, calculating the measurement value after the current belt balance is compensated. The invention can calculate the error according to the error influencing factors and perform error compensation, and has low cost, time saving and labor saving.
Description
Technical Field
The invention relates to the field of weighing, in particular to a belt scale weighing error compensation method.
Background
The belt scale is used as an automatic weighing apparatus for continuously accumulating and weighing, is applied to a conveying system for conveying bulk materials, and can realize rapid automatic weighing. Because the belt scale often works in a severe environment or a complex environment, errors can be generated due to the influence of complex factors. At present, in order to ensure the weighing accuracy of the operation of the electronic belt scale, a method of periodic verification is mainly adopted, for example, calibration and calibration are carried out every 3 months or 6 months according to the operation frequency of the belt scale.
The calibration method mainly comprises the following steps:
(1) Hanging code calibration
The real object of the calibration belt scale provided by the manufacturer is discus marked with weight, and the shape of the real object is the same as that of a weight used on a platform scale. When the weight is directly added to the weighing sensor during hanging code calibration, the weight of the conveyed materials is transferred to the weighing sensor through the belt during actual use of the quantitative feeder, and the weight are not completely the same, namely the hanging code calibration does not consider the tension influence of the belt, and the tension is changed in a great deal along with the material, the thickness, the ambient temperature and the pretightening force of the belt. In addition, inaccurate leverage ratio of the instrument or discus skew can cause calibration errors.
(2) Chain code calibration
The chain code is formed by connecting a plurality of elliptic chain balls into a whole and is placed on a belt of the belt scale, when the conveyor runs, the chain code can keep good contact with the belt, runs stably, and plays a role in simulating load. In theory, the chain code calibration is a calibration method closest to the actual use condition, and the calibration error is relatively low. However, some problems still occur in actual operation: the center line of the chain code deviates from the center line of the belt in the rolling process to bring errors. In order to improve the calibration precision and reduce the linear error of the calibration, chain codes with different weights are required to be provided for different flow rates of the belt scale, so that the cost is too high to achieve.
(3) Physical calibration
The real object calibration uses real objects to calibrate, the conveyed materials are weighed and measured on a static weighing machine (such as an automobile weighing machine), and then are collected to pass through a belt scale for measurement. The weighing measurement value of the static scale is used as a standard, and is compared with the weighing measurement value of the electronic belt scale, so that the measurement accuracy of the electronic belt scale is determined. The substance of the physical verification is a verification method which changes dynamic state into static state. The advantage of the real object calibration is: the material quantity for calibration is large, and the material quantity is completely consistent with the actual measured material property and the unit length weight of the quantitative feeder, so that the calibration precision is high, and the method is the most effective method for detecting the accuracy of the belt scale.
The shortcomings of the physical calibration are: the provision of a standard substance verification system must have two conditions: firstly, the static weighing apparatus needs to be configured by invested funds (often more than hundred thousand or hundreds of thousands of yuan), and secondly, the static weighing apparatus needs to be installed in a sufficient space in the conveying process of the belt scale. Therefore, the real object calibration is high in cost, time-consuming and labor-consuming, and can be implemented only in the period of production stoppage.
It can be seen that several methods have drawbacks and disadvantages. Besides, besides maintaining the accuracy of the belt balance through a method of calibrating the real object period, the belt balance needs to be maintained and checked daily (once a day or once a week), and the real object calibration is time-consuming and labor-consuming, is not suitable for daily maintenance during production, and has certain defects such as lower accuracy and the like in the calibration methods of hanging code calibration, chain code calibration and the like. Seeking other methods for routine maintenance during belt scale production becomes an important issue in automated belt scale production and management.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a belt scale weighing error compensation method which can calculate errors according to error influence factors and compensate the errors, and has the advantages of low cost, time saving and labor saving.
In order to solve the technical problems, the technical scheme of the invention is as follows: a belt scale weighing error compensation method, comprising:
establishing a representative data set comprising n sets of representative belt scale data, the i-th set of representative belt scale data comprising a belt speed differential ΔV i Belt sag Δh i Load gravity carrier roller spacing ratio p i And belt balance metering errorg i ；
Acquiring current data of a belt scale, wherein the current data of the belt scale comprises a current belt speed difference delta V b Current belt sag Δh b Current load gravity idler spacing ratio p b And the current measurement value G of the belt scale b ；
Based onCalculating the error compensation value e of the current belt scale b ；
G-based b -e b Calculating a measurement value after the current belt balance is compensated; wherein,,
x i error factor vector, x, for data of ith group of typical belt scales i ＝(ΔV i ,Δh i ,p i )；
x b Is the error factor vector, x of the current belt scale b ＝(ΔV b ,Δh b ,p b )；
w * Is the optimal error relation coefficient vector.
Further, an optimal error relation coefficient vector w * The calculation method comprises the following steps:
order the
Let the total error objective function be
W is calculated by a gradient descent method,
when (when)When approaching 0, E (w) is the smallest, and the error relation coefficient vector w obtained by iteration is the optimal error relation coefficient vector w * Alpha represents the step size.
Further, the belt speed difference is the difference between the measured speed and the belt scale set speed;
the sagging amount of the belt is the difference between the sagging amount when weighing and the sagging amount of the belt scale when correcting and idling;
the load weight idler spacing ratio is the load weight measured by the belt scale divided by the corresponding idler spacing.
After the technical scheme is adopted, the relation between the error and the corresponding influencing factors is obtained according to the main factors (speed deviation, tension and load) for simulating the error in the real object calibration process and the obtained error data. And in the daily maintenance process during actual production, estimating errors according to the measured error influence factors and performing error compensation. The invention has the advantages of low cost, time and labor saving, less required data quantity and the like, and is suitable for daily maintenance during the production of the belt scale.
Drawings
FIG. 1 is a flow chart of a belt scale weighing error compensation method of the present invention;
fig. 2 is a schematic block diagram of a belt scale weighing error compensation device of the present invention.
Detailed Description
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
As shown in fig. 1, a belt scale weighing error compensation method includes:
s1, establishing a typical data set, wherein the typical data set comprises n groups of typical belt scale data, and the ith group of typical belt scale data comprises a belt speed difference delta V i Belt sag Δh i Load gravity carrier roller spacing ratio p i And belt balance metering error g i ；
S2, acquiring current data of the belt scale, wherein the current data of the belt scale comprises a current belt speed difference delta V b Current belt sag Δh b Current load gravity idler spacing ratio p b And the current measurement value G of the belt scale b ；
S3, based onCalculating the error compensation value e of the current belt scale b ；
S4, based on G b -e b Calculating a measurement value after the current belt balance is compensated;
wherein x is i Error factor vector, x, for data of ith group of typical belt scales i ＝(ΔV i ,Δh i ,p i )；
x b Is the error factor vector, x of the current belt scale b ＝(ΔV b ,Δh b ,p b )；
w * Is the optimal error relation coefficient vector.
n may be 30, 40, 50, 55, etc.
In one embodiment, the optimal error relationship coefficient vector w * The calculation method comprises the following steps:
order the
Let the total error objective function be
W is calculated by a gradient descent method,
when (when)When approaching 0, E (w) is the smallest, and the error relation coefficient vector w obtained by iteration is the optimal error relation coefficient vector w * Alpha represents the step size.
Wherein the error relation coefficient vector w is (w 1 ,w 2 ,w 3 ) The initial value setting of the error relation coefficient vector w may be set randomly, for example, as (0.3,2,0.8).
I.e. < ->Representing the gradient of E (w).
It should be noted that the belt speed difference is the difference between the measured speed and the set speed of the belt scale or the difference between the measured speed and the speed measured by the photoelectric rotation speed sensor of the belt scale itself.
The sagging amount of the belt is the difference between the sagging amount when weighing and the sagging amount of the belt scale when correcting and idling;
the load weight carrier roller spacing ratio is obtained by dividing the load weight measured by the belt scale by the corresponding carrier roller spacing;
metering error g of belt scale i The weight of the material measured by the belt scale is subtracted from the actual weight of the material (obtained by static weighing).
As shown in fig. 2, the belt speed is generally measured by a speed measuring module, which may be a video speed measuring module. The principle of measuring the speed by the video speed measuring module is that the time interval corresponding to the distance between two adjacent frames of objects and the video frame frequency is utilized, therefore, the video speed measuring module can also be used for measuring the sagging amount of the belt, the speed measuring module is connected with a singlechip of the belt scale, and the error compensation value e of the current belt scale is carried out through the singlechip b And calculating the measurement value compensated by the current belt scale, and displaying the measurement value through a display screen connected with the pad singlechip.
The running speed of the belt, the structure and the installation angle of the scale frame, the installation, debugging, management and maintenance processes are objective factors which influence the running precision of the belt scale and generate metering errors. Specifically, the influence of the symmetrical weighing sensor of the belt tension and the belt running resistance, the collimation degree of the weighing carrier roller and the carrier roller shake, the balance body rubs with the carrier roller, the thickness, the material, the shape and the rigidity of the used belt, the drift between the belt and the carrier roller caused by the temperature and humidity influence in the actual environment, the belt deviation caused by equipment aging and other factors can cause the metering error of the belt balance. The above factors cannot be directly measured, or the difficulty of measurement is high, and the cost is high; considering that the belt speed difference, the belt sagging amount change and the load weight carrier roller spacing ratio are relatively easy to measure and calculate, and the relation between the obtained indexes and the metering error is taken as an entry point, so that the coefficient of the metering error along with the belt speed measurement difference, the belt sagging amount change and the load weight carrier roller spacing ratio change is finally obtained, and the metering error compensation of the belt scale is carried out according to the obtained coefficient, so that the belt weight carrier roller spacing ratio measuring device has the advantages of low cost, time saving, labor saving and higher accuracy.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (3)
1. A belt scale weighing error compensation method is characterized in that,
comprising the following steps:
establishing a representative data set comprising n sets of representative belt scale data, the i-th set of representative belt scale data comprising a belt speed differential ΔV i Belt sag Δh i Load gravity carrier roller spacing ratio p i And belt balance metering error g i ；
Acquiring current data of a belt scale, wherein the current data of the belt scale comprises a current belt speed difference delta V b Current belt sag Δh b Current load gravity idler spacing ratio p b And the current measurement value G of the belt scale b ；
Based onCalculating the error compensation value e of the current belt scale b ；
G-based b -e b Calculating a measurement value after the current belt balance is compensated; wherein,,
x i error factor vector, x, for data of ith group of typical belt scales i ＝(ΔV i ,Δh i ,p i )；
x b Is the error factor vector, x of the current belt scale b ＝(ΔV b ,Δh b ,p b )；
w * Is the optimal error relation coefficient vector.
2. A belt scale weighing error compensation method as defined in claim 1, wherein,
optimum error relation coefficient vector w * The calculation method comprises the following steps:
order the
Let the total error objective function be
W is calculated by a gradient descent method,
when (when)When approaching 0, E (w) is the smallest, and the error relation coefficient vector w obtained by iteration is the optimal error relation coefficient vector w * Alpha represents the step size.
3. A belt scale weighing error compensation method as defined in claim 1, wherein,
the belt speed difference is the difference between the measured speed and the belt scale set speed;
the sagging amount of the belt is the difference between the sagging amount when weighing and the sagging amount of the belt scale when correcting and idling;
the load weight idler spacing ratio is the load weight measured by the belt scale divided by the corresponding idler spacing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310820983.2A CN116772997A (en) | 2023-07-05 | 2023-07-05 | Belt scale weighing error compensation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310820983.2A CN116772997A (en) | 2023-07-05 | 2023-07-05 | Belt scale weighing error compensation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116772997A true CN116772997A (en) | 2023-09-19 |
Family
ID=88008052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310820983.2A Withdrawn CN116772997A (en) | 2023-07-05 | 2023-07-05 | Belt scale weighing error compensation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116772997A (en) |
-
2023
- 2023-07-05 CN CN202310820983.2A patent/CN116772997A/en not_active Withdrawn
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105241537B (en) | A kind of method of adjustment of belted electronic balance weighing precision stability | |
| CN103900676A (en) | Method for monitoring durability of electronic belt scale | |
| CN107091677B (en) | Error compensation method and belt scale based on error compensation | |
| CN202393486U (en) | Correcting device of electronic belt scale and correcting weight used for device | |
| CN116772997A (en) | Belt scale weighing error compensation method | |
| US4480705A (en) | Platform calibration factor for conveyor inclination angle | |
| CN108151836A (en) | A kind of high-precision suspension array belt weigher | |
| Aleksandrović et al. | Analysis of belt weigher accuracy limiting factors | |
| CN104880242B (en) | The caliberating device and method of double carrier belted electronic balances | |
| CN112050916B (en) | Method for measuring total mass of material based on vibration frequency of weighing carrier roller | |
| CN206074113U (en) | Bucket wheel machine coal blending weighs update the system | |
| CN112146742A (en) | Real-time dynamic checking electronic belt scale assembly and checking method thereof | |
| CN204944658U (en) | The caliberating device of two carrier belted electronic balance | |
| Živanić et al. | The analysis of influential parameters on calibration and feeding accuracy of belt feeders | |
| CN210268847U (en) | Electronic belt scale body with accurate measurement | |
| CN110319910B (en) | Belt scale automatic code adding online checking method and checking system thereof | |
| CN114543952A (en) | Error self-compensation method of electronic belt scale for cigarette production | |
| CN116358685A (en) | Electronic belt scale bar code correction method | |
| CN205373838U (en) | High accuracy suspension array belt weigher | |
| BR102019004807B1 (en) | SYSTEM AND METHOD FOR MEASURING DYNAMIC TENSION AT ARBITRARY POINTS OF BELT ON A CONVEYOR | |
| CN1472513A (en) | Inner weight correcting method for electronic high-accuracy balance | |
| CN111307255A (en) | Weighing method and system of belt scale | |
| AU676595B2 (en) | Temperature-compensated belt scale | |
| CN220120216U (en) | Electronic belt scale | |
| CN201078742Y (en) | Real-time detection apparatus for lower bearing type belt tension variety |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20230919 |