CN110806256B - Online real-time calculation and judgment method for electronic belt scale - Google Patents
Online real-time calculation and judgment method for electronic belt scale Download PDFInfo
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- CN110806256B CN110806256B CN201911162026.5A CN201911162026A CN110806256B CN 110806256 B CN110806256 B CN 110806256B CN 201911162026 A CN201911162026 A CN 201911162026A CN 110806256 B CN110806256 B CN 110806256B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/01—Testing or calibrating of weighing apparatus
Abstract
The invention discloses an on-line real-time calculation and judgment method of an electronic belt scale, which takes a material signal of the electronic belt scale as a trigger condition, collects a weight collection value and a speed collection value, an instantaneous flow collection value and an accumulated weight collection value output by the electronic belt scale, and calculates an instantaneous flow calculation value and an accumulated weight calculation value; and calculating the ratio of the collection points of the instantaneous flow collection value to the total collection points within the upper limit and the lower limit of the instantaneous flow calculation value and the ratio of the collection points of the accumulated weight collection value to the total collection points within the upper limit and the lower limit of the accumulated weight calculation value to obtain the qualification rate of the instantaneous flow collection value and the accumulated weight collection value. The method for judging the matching of the instantaneous flow and the accumulated weight of the electronic belt scale realizes the real-time monitoring of the weighing accuracy of the electronic belt scale and the estimation of the risk of weighing errors, can alarm and stop in time through real-time judgment, reduces the condition of quality damage of production materials, and greatly improves the process monitoring strength of the electronic belt scale.
Description
Technical Field
The invention relates to the technical field of electronic belt weighers, in particular to an online real-time calculation and judgment method for an electronic belt weigher.
Background
The electronic belt scale is an important device of a production line in the manufacturing industry, and realizes accurate measurement of moving materials. In the 03 edition of cigarette process specification, the stability of the material flow (instantaneous weight) of the processing procedure is taken as an index for measuring the processing capacity, and each manufacturer tries to improve the index. Whether the process material flow is stable or not is guaranteed by the constant-flow electronic belt scale, so each electronic belt scale manufacturer thinks many methods on the stability of the material flow, for example, the height of the material on the electronic belt scale is mechanically controlled, the height of the material passing through a weighing area is consistent, and the research on the tension degree of a belt is also a method for guaranteeing the stability of the material weighing. However, in actual production, the sampled data is also greatly corrected, for example, the instantaneous flow exceeds a threshold value and is directly negative; data averaging and the like distort the instantaneous flow, but the accumulated weight (total material weight) is measured by a metering method without a correction program, so that the material flow deviates from the accumulated weight, and the material flow is used for guiding the feeding amount.
Different manufacturers of electronic belt scales pursue stabilization of instantaneous flow and accuracy of accumulated weight, and neglect the matching of the instantaneous flow and the accumulated weight. The prior art does not have a method for measuring the matching of the instantaneous flow and the accumulated weight; the on-line blending material is generally blended according to the instantaneous flow, the accumulated weight of two materials is generally used for calculating precision calculation, and the blending material process is inaccurate due to the fact that the instantaneous flow and the accumulated weight of the electronic belt scale are not matched, so that the quality of the produced material is influenced.
Disclosure of Invention
The invention aims to provide an on-line real-time calculation and evaluation method for an electronic belt scale, which is used for solving the problems that the use of the electronic belt scale in the prior art does not consider the matching property of instantaneous flow and accumulated weight and does not measure the matching property, and the problems that the application of a blending material is not accurate and the quality of a produced material is influenced due to the mismatching of the instantaneous flow and the accumulated weight are solved.
The invention solves the problems through the following technical scheme:
an on-line real-time calculation and judgment method for an electronic belt scale comprises the following steps:
step S1: the method comprises the following steps of taking a material signal of the electronic belt scale as a trigger condition, collecting a weight collection value and a speed collection value, an instantaneous flow collection value and an accumulated weight collection value output by the electronic belt scale, and calculating an instantaneous flow calculation value and an accumulated weight calculation value:
instantaneous flow calculation value is weight collection value multiplied by speed collection value
Wherein n is the sampling frequency of each batch of materials, and n is the production duration/sampling frequency;
step S2: calculating the instantaneous flow qualification rate and the accumulated weight qualification rate in the acquisition process, specifically:
during sampling, the instantaneous flow collection values satisfying formula (1) are counted:
instantaneous flow calculated value X (1-M)1%) < instantaneous flow rate acquisition value < instantaneous flow rate calculation value x (1+ M)1％) (1)
Dividing the counting result by the sampling times to obtain the instantaneous flow qualification rate;
counting the accumulated weight collection values satisfying formula (2):
cumulative weight calculated value X (1-M)2% of the weight of the composition < the cumulative weight of the composition < x (1+ M)2％) (2)
Dividing the counting result by the sampling times to obtain the accumulated weight qualified rate;
wherein M is1For instantaneous flow fluctuation range values, M2To accumulate weight fluctuation range values.
And further monitoring the risk of weighing errors and taking an alarm or stopping operation according to the obtained instantaneous flow qualified rate and the accumulated weight qualified rate.
Firstly, establishing a judgment scheme of the metering process of the electronic belt scale according to a calculation formula of an instantaneous flow calculation value and an accumulated weight calculation value; secondly, setting a judgment standard index of the electronic belt scale according to the formulas (1) and (2), and recalculating the load and the speed of the electronic belt scale on the basis; and finally, the PLC programming is applied to realize real-time automatic online scoring. The invention realizes the real-time monitoring of the weighing accuracy of the electronic belt scale and the estimation of the weighing error risk, can alarm and stop in time through real-time judgment, reduces the condition of the quality damage of the produced materials, and greatly improves the process monitoring strength of the electronic belt scale.
And further, adjusting the feeding flow and the feeding proportion to match the instantaneous flow with the accumulated weight according to the obtained instantaneous flow qualified rate and the accumulated weight qualified rate.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention provides a method for judging the matching of the instantaneous flow and the accumulated weight of an electronic belt scale, which realizes the real-time monitoring of the weighing accuracy of the electronic belt scale and the estimation of the risk of weighing errors, can alarm and stop in time through real-time judgment, reduces the condition of damaged quality of production materials and greatly improves the process monitoring strength of the electronic belt scale.
(2) The invention researches the weighing accuracy and the matching between the instantaneous flow and the accumulated flow of the electronic belt scale, enhances the feeding control capability and improves the precision and the instantaneous precision of the feeding process. The acquisition, counting and qualification rate calculation in the invention are automatically executed by programs, no requirement for increasing the operator is required, and the calculation is completely carried out under the automatic condition.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1:
an on-line real-time calculation and judgment method for an electronic belt scale comprises the following steps:
step S1: the method comprises the following steps of taking a material signal of the electronic belt scale as a trigger condition, collecting a weight collection value and a speed collection value, an instantaneous flow collection value and an accumulated weight collection value output by the electronic belt scale, and calculating an instantaneous flow calculation value and an accumulated weight calculation value:
instantaneous flow calculation value is weight collection value multiplied by speed collection value
Wherein n is the sampling frequency of each batch of materials, and n is the production duration/sampling frequency;
step S2: calculating the instantaneous flow qualification rate and the accumulated weight qualification rate in the acquisition process, specifically:
during sampling, the instantaneous flow collection values satisfying formula (1) are counted:
instantaneous flow calculated value X (1-M)1%) < instantaneous flow rate acquisition value < instantaneous flow rate calculation value x (1+ M)1％) (1)
Dividing the counting result by the sampling times to obtain the instantaneous flow qualification rate;
counting the accumulated weight collection values satisfying formula (2):
cumulative weight calculated value X (1-M)2% of the weight of the composition < the cumulative weight of the composition < x (1+ M)2％) (2)
Dividing the counting result by the sampling times to obtain the accumulated weight qualified rate;
wherein M is1For instantaneous flow fluctuation range values, M2To accumulate weight fluctuation range values. The two values are set as variables, the range of the upper limit and the lower limit can be set according to actual conditions, and the assessment standard needs to be changed according to different field conditions in practice.
The data collected by the sampling unit (weight sensor and speed sensor) of the electronic belt scale is transmitted to the central controller to simulate the running environment of the electronic belt scale, in other words, a theoretical model of the electronic belt scale is made, and the calculated (instantaneous flow and accumulated weight) in the theoretical model is compared with the output value (instantaneous flow and accumulated weight) of the electronic belt scale to determine the deviation degree. The determination of the two range values is a practical and groped process and is determined according to the influence degree of the previous model and the deviation degree of the electronic belt scale on the processing process.
And further monitoring the risk of weighing errors and taking an alarm or stopping operation according to the obtained instantaneous flow qualified rate and the accumulated weight qualified rate.
Firstly, establishing a judgment scheme of the metering process of the electronic belt scale according to a calculation formula of an instantaneous flow calculation value and an accumulated weight calculation value; secondly, setting a judgment standard index of the electronic belt scale according to the formulas (1) and (2), and recalculating the load and the speed of the electronic belt scale on the basis; and finally, the PLC programming is applied to realize real-time automatic online scoring. The invention realizes the real-time monitoring of the weighing accuracy of the electronic belt scale and the estimation of the weighing error risk, can alarm and stop in time through real-time judgment, reduces the condition of the quality damage of the produced materials, and greatly improves the process monitoring strength of the electronic belt scale.
And further, adjusting the feeding flow and the feeding proportion to match the instantaneous flow with the accumulated weight according to the obtained instantaneous flow qualified rate and the accumulated weight qualified rate.
The weight of the belt weigher is divided into instant weight and accumulated weight, the instant weight is used for calculating the instant feed liquid application amount, and finally the accumulated amount of the feed liquid application amount and the accumulated amount of the electronic belt weigher are used for calculating the proportion, so that the inconsistent feeding proportion can be caused when the instant flow and the accumulated weight of the electronic belt weigher are inconsistent, and the deviation of feeding precision is caused. Therefore, the consistency problem of the instant quantity and the cumulant quantity of the electronic belt scale is judged in the process, if the quantity is unqualified, the matching performance of the quantity and the cumulant quantity is improved by adjusting equipment, and the precision of a feeding link is improved. The judgment method is implemented by PLC program execution, called by main program in subprogram mode, instantaneous flow is calculated by weight acquisition value and speed acquisition value, upper and lower limits are calculated by instantaneous flow obtained by calculation, and qualified rate accumulation is triggered by using material signal of electronic belt scale as condition. Sampling is carried out according to the sampling frequency, the counter carries out counting when the sampling flow is within the upper limit and the lower limit, when the material signal of the belt scale is lost, the counting is stopped, and the obtained counting result is divided by the total sampling times to obtain the final judgment result. And calculating theoretical cumulant according to a calculation formula, calculating upper and lower limits, counting samples in the range, and scoring according to the proportion of the samples occupying all sampling points.
Although the present invention has been described herein with reference to the illustrated embodiments thereof, which are intended to be preferred embodiments of the present invention, it is to be understood that the invention is not limited thereto, and that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure.
Claims (3)
1. An on-line real-time calculation and judgment method for an electronic belt scale is characterized by comprising the following steps:
step S1: the method comprises the following steps of taking a material signal of the electronic belt scale as a trigger condition, collecting a weight collection value and a speed collection value, an instantaneous flow collection value and an accumulated weight collection value output by the electronic belt scale, and calculating an instantaneous flow calculation value and an accumulated weight calculation value:
instantaneous flow calculation value is weight collection value multiplied by speed collection value
Wherein n is the sampling frequency of each batch of materials, and n is the production duration/sampling frequency;
step S2: calculating the instantaneous flow qualification rate and the accumulated weight qualification rate in the acquisition process, specifically:
during sampling, the instantaneous flow collection values satisfying formula (1) are counted:
instantaneous flow calculated value X (1-M)1%) < instantaneous flow rate acquisition value < instantaneous flow rate calculation value x (1+ M)1％) (1)
Dividing the counting result by the sampling times to obtain the instantaneous flow qualification rate;
counting the accumulated weight collection values satisfying formula (2):
cumulative weight calculated value X (1-M)2% of the weight of the composition < the cumulative weight of the composition < x (1+ M)2％) (2)
Dividing the counting result by the sampling times to obtain the accumulated weight qualified rate;
wherein M is1For instantaneous flow fluctuation range values, M2To accumulate weight fluctuation range values.
2. The on-line real-time calculation and evaluation method of the electronic belt scale according to claim 1, further comprising monitoring a risk of weighing error and taking an alarm or shutdown operation according to the obtained instantaneous flow rate qualification rate and the accumulated weight qualification rate.
3. The on-line real-time calculation and evaluation method of the electronic belt scale according to claim 1, further comprising adjusting the feeding flow and the feeding proportion to match the instantaneous flow with the accumulated weight according to the obtained instantaneous flow qualification rate and the accumulated weight qualification rate.
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| CN111896087B (en) * | 2020-08-12 | 2021-10-22 | 无锡跃进科技有限公司 | Dynamic metering method for hopper scale |
| CN114719945B (en) * | 2022-04-01 | 2023-07-21 | 广东中烟工业有限责任公司 | Flow control precision self-adapting method, system and computer medium for controlling electronic belt scale |
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