CN111623857A - High-precision multi-point metering intelligent belt scale - Google Patents
High-precision multi-point metering intelligent belt scale Download PDFInfo
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- CN111623857A CN111623857A CN202010522700.2A CN202010522700A CN111623857A CN 111623857 A CN111623857 A CN 111623857A CN 202010522700 A CN202010522700 A CN 202010522700A CN 111623857 A CN111623857 A CN 111623857A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G11/00—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers
- G01G11/003—Details; specially adapted accessories
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G11/00—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers
- G01G11/14—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers using totalising or integrating devices
- G01G11/16—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers using totalising or integrating devices being electrical or electronic means
- G01G11/18—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers using totalising or integrating devices being electrical or electronic means using digital counting
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Abstract
The invention relates to material conveying and weighing measurement, in particular to a high-precision multi-point measurement intelligent belt scale which comprises a belt, a weighing platform, a velometer, a signal processing module and an upper distributed control system, wherein the weighing platform is arranged on the upper part of the belt; the weighing platform is provided with a plurality of parts and consists of a carrier roller, a weighing frame and a high-precision digital sensor; the belt is supported by the carrier roller, and the carrier roller is connected with the high-precision digital sensor through a lever type scale frame with a precision bearing to obtain weight data; the velometer with the non-fixed wide tread structure is kept in contact with the belt, and belt speed data are measured; the signal processing module collects weight data and speed data, eliminates error data, calculates to obtain instantaneous flow of the transmitted materials, and reports the instantaneous flow to the upper distributed control system. Each intelligent belt scale only needs to comprise at least four groups of weighing platforms, and accurate instantaneous flow can be obtained. The invention reduces the number of parallel weighing platforms, increases the accuracy and stability of weighing and metering and further reduces the cost.
Description
Technical Field
The invention relates to material conveying and weighing, in particular to a high-precision multi-point metering intelligent belt scale.
Background
In the existing industrial production, a scale frame of a metering belt scale adopts a two-end double-sensor direct-pressure structure, and the gravity of materials directly acts on a sensor through the scale frame. At the moment, when the material moves at a high speed and passes through the metering carrier roller, a horizontal component force is generated on the carrier roller, so that the metering precision of the weighing sensor on the material is influenced. In order to ensure enough metering precision, the number of weighing platforms on one belt scale is eight weighing platforms or even more than ten weighing platforms, the metering length is long, and the installation engineering amount is large.
Meanwhile, the velometer in the prior art is fixed and is in surface contact with the upper belt of the conveying belt. If the belt is loose or tight, the speed measuring wheel is easy to be unstably contacted with the belt, so that the speed measuring precision is reduced. Moreover, the width of the wheel surface of the prior velometer is too narrow, so that the prior velometer is easy to wear and even scratch the belt after being worn.
The sensors adopted in the prior art are analog sensors and analog signal processing, and are easily interfered to influence the metering result.
Disclosure of Invention
The invention aims to provide a high-precision multi-point metering intelligent belt scale, which mainly solves the problems in the prior art, can increase the accuracy of weighing and metering, and simultaneously reduces the number of parallel weighing platforms to further reduce the cost.
In order to achieve the purpose, the technical scheme adopted by the invention is to provide a high-precision multi-point metering intelligent belt scale, which is characterized in that: comprises a belt, a weighing platform, a velometer, a signal processing module and an upper distributed control system; the weighing platform is provided with a plurality of parts and consists of a carrier roller, a weighing frame and a high-precision digital sensor; the belt is supported by the carrier roller, and the carrier roller is connected with the high-precision digital sensor through the scale frame; the velometer is in contact with the belt, and the real-time running speed of the belt is measured; the signal processing module collects and processes the weight data from the high-precision digital sensor and the speed data of the velometer to obtain the instantaneous flow of the materials transmitted on the belt and reports the instantaneous flow to the superior centralized and decentralized control system.
Furthermore, the scale frame is a lever-type structure scale frame adopting a precision bearing.
Furthermore, each weighing platform corresponds to one high-precision digital sensor; the high-precision digital sensor and the first fulcrum and the second fulcrum of the precision bearing of the lever-type structure scale frame form an isosceles triangle structure.
Further, the velometer is a non-fixed wide tread structure.
Further, the velometer is held in stable contact with the lower belt surface of the belt by gravity.
Further, at least four of the weighing platforms are arranged in parallel; at least two sets of said support rollers of said weighing platform are completely within the metering zone.
Further, the high-precision digital sensor comprises a digital compensation circuit, a temperature sensor, an RS485 interface and digital compensation software; the high-precision digital sensor has the compensation functions of linearity, hysteresis and creep, and the digital compensation software is matched with the temperature sensor and has the real-time temperature compensation function; and after the original data are compensated, the original data are transmitted to the signal processing module through the RS485 interface.
Further, after the signal processing module receives the weight data and the speed data, the processing step includes:
step S101, averaging all the weight data obtained in a sampling period T to obtain a weight average value;
step S102, integrating the weight average value by using a speed signal acquired by the velometer to obtain instantaneous flow;
and step S103, reporting the instantaneous flow.
Further, after the signal processing module receives the weight data and the speed data, the processing step includes:
step S201, eliminating a maximum weight value and a minimum weight value from all the weight data obtained in a sampling period T;
step S202, averaging the weight data after the maximum weight value and the minimum weight value are eliminated to obtain a standard reference value;
step S203, comparing all the weight data obtained in a sampling period T with the standard reference value, and eliminating the weight data which are not in the positive and negative thresholds of the standard reference value to obtain an optimized weight data set;
step S204, averaging the optimized weight data set to obtain a weight average value;
step S205, integrating the weight average value by using the speed signal collected by the velometer to obtain instantaneous flow;
and step S206, reporting the instantaneous flow.
Further, the threshold is 20%.
In view of the above technical features, the present invention has the following advantages:
1. the invention adopts the lever type scale frame with the precision bearing, and the horizontal component forces of the materials to the carrier roller are mutually offset through the friction torque acting on the rotating shaft, so that the weighing sensor is only acted by the force vertical to the scale frame, and the weighing is more accurate.
2. The invention adopts a single-sensor weighing structure, and in the single-sensor structure, a sensor fulcrum arranged in the middle of a scale frame and bearing fulcrums at two ends form a group of triangular structures, so that the sensor is not influenced by unbalance loading and the like, and the weighing is more stable.
3. The speed measuring device is in surface contact with the lower belt, and adopts a gravity type principle, so that the speed measuring wheel is always in stable contact with the belt surface under the action of gravity, the speed measurement is stable, and the wheel surface is wide, durable and not easy to wear.
4. The scale frame of the invention can meet the precision requirement only by adopting four weighing platforms. Two sections of metering carrier rollers are completely arranged in the metering area in the arrangement of the four weighing platforms, so that the influence generated by the tension change of the belt can be controlled in the metering area, the influence of the tension change on the whole set of weighing system is eliminated, and the metering precision of the whole set of metering system is further improved.
5. The invention introduces the high-precision digital sensor to replace an analog sensor, eliminates abnormal data by matching with a digital metering method, and optimizes the error value of the weight acquisition signal of the equipment, thereby ensuring that the measurement data is more accurate.
Drawings
FIG. 1 is a general schematic diagram of a preferred embodiment of an intelligent belt scale of the present invention;
FIG. 2 is a front view of the general arrangement of a preferred embodiment of the intelligent belt scale of the present invention;
FIG. 3 is a top plan view of the general arrangement of a preferred embodiment of the intelligent belt scale of the present invention;
FIG. 4 is a front view of a velometer and a scale bed of a preferred embodiment of the intelligent belt scale of the present invention;
FIG. 5 is a top view of a velometer and a scale platform of a preferred embodiment of the intelligent belt scale of the present invention;
FIG. 6 is a schematic view of the arrangement of the velometer of the intelligent belt scale according to the preferred embodiment of the present invention;
FIG. 7 is an electrical connection diagram of a preferred embodiment of the intelligent belt scale of the present invention;
fig. 8 is a data processing flow diagram of a preferred embodiment of the intelligent belt scale of the present invention;
fig. 9 is another data processing flow diagram of a preferred embodiment of the intelligent belt scale of the present invention.
Wherein: 100-weighing platform, 200-velometer, 300-belt, 400-signal processing module, 500-upper distributed control system 500;
101-carrier roller, 102-precision bearing, 103-connecting mechanism and 104-high-precision digital sensor;
1021-first fulcrum, 1022-second fulcrum.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Referring to fig. 1 to 9, the technical solution adopted by the present invention is to provide a high-precision multi-point metering intelligent belt scale, which is characterized in that: comprises a belt 300, a weighing platform 100, a velometer 200, a signal processing module 400 and an upper centralized and decentralized control system 500; the weighing platform 100 comprises a plurality of parts and consists of a carrier roller 101, a weighing frame and a high-precision digital sensor 104; the belt 300 is supported by the carrier roller 101, and the carrier roller 101 is connected with the high-precision digital sensor 104 through the scale frame; the velometer 200 is in contact with the belt 300, and measures the real-time running speed of the belt 300; the signal processing module 400 collects and processes the weight data from the high-precision digital sensor 104 and the speed data of the velometer 200 to obtain the instantaneous flow rate of the material transported on the belt 300, and reports the instantaneous flow rate to the upper level centralized and decentralized control system 500.
Further, the scale frame is a lever-type structure scale frame adopting a precision bearing 102.
Further, each scale platform 100 corresponds to one of the high-precision digital sensors 104; the high-precision digital sensor 104 and the first fulcrum 1021 and the second fulcrum 1022 of the precision bearing 102 of the lever-type scale frame form an isosceles triangle structure.
Further, the velometer 200 is a non-fixed wide tread configuration.
Further, the tachometer 200 is stably in contact with the lower belt surface of the belt 300 by gravity.
Further, at least four of the weighing platforms 100 arranged side by side are included; at least two sets of the idlers 101 of the scale platform 100 are completely within the metering region.
Further, the high-precision digital sensor 104 includes a digital compensation circuit, a temperature sensor, an RS485 interface, and digital compensation software; the high-precision digital sensor 104 has the compensation functions of linearity, hysteresis and creep, and the digital compensation software is matched with the temperature sensor to have the real-time temperature compensation function; the original data is compensated and then transmitted to the signal processing module 400 through the RS485 interface.
Further, after the signal processing module 400 receives the weight data and the speed data, the processing steps include:
step S101, averaging all the weight data obtained in a sampling period T to obtain a weight average value;
step S102, integrating the weight average value by using the speed signal acquired by the velometer 200 to obtain instantaneous flow;
and step S103, reporting the instantaneous flow.
Further, after the signal processing module 400 receives the weight data and the speed data, the processing steps include:
step S201, eliminating a maximum weight value and a minimum weight value from all the weight data obtained in a sampling period T;
step S202, averaging the weight data after the maximum weight value and the minimum weight value are eliminated to obtain a standard reference value;
step S203, comparing all the weight data obtained in a sampling period T with the standard reference value, and eliminating the weight data which are not in the positive and negative thresholds of the standard reference value to obtain an optimized weight data set;
step S204, averaging the optimized weight data set to obtain a weight average value;
step S205, integrating the weight average value by using the speed signal acquired by the velometer 200 to obtain instantaneous flow;
and step S206, reporting the instantaneous flow.
Further, the threshold is 20%.
In the embodiment of the method, the first step,
referring to fig. 1, 2 and 3, a high-precision multi-point metering intelligent belt scale according to a preferred embodiment of the present invention includes a belt 300, a weighing platform 100, a velometer 200, a signal processing module 400 and an upper centralized control system 500. The weighing platform 100 supports the belt 300, measures the weight data of the material on the belt 300, and transmits the data to the signal processing module 400. The velometer 200 is located at one end of the belt scale, measures the real-time running speed of the belt 300, and transmits the real-time running speed to the signal processing module 400. The signal processing module 400 collects and processes the weight data from the weighing platform 100 and the speed data of the velometer 200 to obtain the instantaneous flow of the transported material, and then reports the instantaneous flow to the upper distributed control system 500.
A belt scale comprises at least four side-by-side weighing platforms 100, in this embodiment four side-by-side weighing platforms 100 are arranged, and the two central groups of weighing platforms 100 are located entirely within the measuring region.
Referring to fig. 4, 5 and 6, a platform 100 of a high-precision multi-point measurement intelligent belt scale according to a preferred embodiment of the present invention is composed of a supporting roller 101, a frame and a high-precision digital sensor 104. The scale frame is a lever-type structure scale frame adopting a precision bearing 102, the precision bearing 102 is arranged at one end of a lever and is used as a fulcrum of the lever, a connecting mechanism 103 on the lever is upwards connected with a carrier roller 101 to transfer the vertical weight of a material, and a high-precision digital sensor 104 is arranged at the other end of the lever. Each scale platform 100 corresponds to only one high-precision digital sensor 104. The high precision digital sensor 104 is located in the middle of the platform and forms an isosceles triangle with the first fulcrum 1021 and the second fulcrum 1022 of the precision bearing 102.
The high-precision digital sensor 104 is provided with an amplifying and A/D converting circuit on the basis of an analog sensor, and performs linear, lag, creep and other compensation through a digital compensation circuit and a process, and the built-in temperature sensor can perform real-time temperature compensation by matching with added compensation software, and has adjustable address, convenient application and interchange, and remote diagnosis and correction. In addition, intelligent automatic control software is also configured, has sensitive function, and can complete all or most of functions such as weighing signal detection and processing, logic judgment, closed-loop control, bidirectional communication, circulating self-detection and self-diagnosis, automatic correction and compensation, automatic calculation and the like. The millivolt signal of the sensor is only provided with a special cable of a few millimeters from the strain gauge to the front section of the amplifier, so that the lead is ensured not to introduce errors and electromagnetic signal interference to the maximum extent. Then, because a high-precision 24-bit A/D converter is adopted in the A/D conversion part, the signals in the analog section are ensured to have almost no loss and any interference, and the signal conversion is ensured to be free from errors. Meanwhile, weak errors of the data output by the A/D converter due to various environmental parameter changes are calculated and corrected by a core processor CPU of the high-precision digital sensor 104. Compared with an analog sensor, the high-precision digital sensor 104 has high anti-interference capability and high signal-to-noise ratio, reduces the loss of a weighing signal, improves the metering accuracy and improves the transmission speed. And finally, the CPU outputs the processed data through an RS485 interface. The RS485 signal can realize industrial-level communication, the farthest distance can reach 1.2km, and the sensor can reliably work in a severe electromagnetic interference background environment, so that the defects of short transmission distance and high requirement on the environment of the analog sensor are overcome. The high-precision digital sensor 104 employed in the present embodiment is a DUB2 series digital sensor.
The velometer 200 is a non-fixed wide tread structure, and is stably contacted with the lower belt surface of the belt 300 through gravity, so that when the tightness of the belt 300 changes, the belt 300 can still be automatically pressed down, and the real-time speed of the belt 300 can be accurately obtained. The specific model of the velometer 200 used in the present embodiment is LE626 velometer.
Referring to fig. 7, in a high-precision multi-point metering intelligent belt scale according to a preferred embodiment of the present invention, the weight data obtained from the weighing platform 100 and the speed data obtained from the speed detector 200 are collected to the signal processing module 400, processed uniformly and obtained an instantaneous flow rate, and then reported to the upper centralized control system 500 through the TB1 interface. The specific model of the signal processing module 400 adopted in the present embodiment is a metering device CFC series.
Referring to fig. 8, after the signal processing module receives the weight data and the speed data of the tester collected by the high-precision digital sensor, the processing steps include:
step S101, averaging all the weight data obtained in a sampling period T to obtain a weight average value. In the present embodiment, the sampling period T is once every 1 second.
And S102, integrating the weight average value by using the speed data acquired by the velometer to obtain the instantaneous flow.
And step S103, reporting the instantaneous flow to an upper distributed control system.
Referring to fig. 9, after the signal processing module receives the weight data and the speed data of the tester collected by the high-precision digital sensor, the processing steps may further include:
in step S201, the maximum weight value and the minimum weight value are eliminated from all the weight data obtained in one sampling period T. In the present embodiment, the sampling period T is once every 1 second.
Step S202, averaging the weight data after the maximum weight value and the minimum weight value are eliminated, and obtaining a standard reference value.
This procedure is used to eliminate sporadic bias data to avoid the effect of extreme bias data on the measurement due to transient disturbances.
Step S203, comparing all weight data obtained in a sampling period T with a standard reference value, and eliminating weight data which are not in the positive and negative thresholds of the standard reference value to obtain an optimized weight data set.
In the process, the data with overlarge distribution deviation is eliminated by using the standard reference value as a scale, and the weight data are further smoothed. In this embodiment, the sampling period T is 1 second, the threshold is 20%, that is, the weight data outside the plus or minus 20% of the standard reference value is eliminated, and does not participate in the calculation of the subsequent steps.
Step S204, averaging the optimized weight data set to obtain a weight average value;
step S205, integrating the weight average value by using the speed signal collected by the velometer to obtain instantaneous flow;
and step S206, reporting the instantaneous flow.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a high accuracy multiple spot measurement intelligence belt weigher which characterized in that: comprises a belt, a weighing platform, a velometer, a signal processing module and an upper distributed control system; the weighing platform is provided with a plurality of parts and consists of a carrier roller, a weighing frame and a high-precision digital sensor; the belt is supported by the carrier roller, and the carrier roller is connected with the high-precision digital sensor through the scale frame; the velometer is in contact with the belt, and the real-time running speed of the belt is measured; the signal processing module collects and processes the weight data from the high-precision digital sensor and the speed data of the velometer to obtain the instantaneous flow of the materials transmitted on the belt and reports the instantaneous flow to the superior centralized and decentralized control system.
2. The intelligent belt scale of claim 1, wherein the scale frame is a lever-type structure scale frame employing precision bearings.
3. The intelligent belt scale of claim 2, wherein each of the weighing platforms corresponds to one of the high-precision digital sensors; the high-precision digital sensor and the first fulcrum and the second fulcrum of the precision bearing of the lever-type structure scale frame form an isosceles triangle structure.
4. The intelligent belt scale of claim 1, wherein the velometer is a non-fixed wide tread configuration.
5. The intelligent belt scale of claim 4, wherein the velometer is held in stable contact with the lower belt face of the belt by gravity.
6. The intelligent belt scale of claim 1, comprising at least four of said weighing platforms arranged in parallel; at least two sets of said support rollers of said weighing platform are completely within the metering zone.
7. The intelligent belt scale of claim 1, wherein: the high-precision digital sensor comprises a digital compensation circuit, a temperature sensor, an RS485 interface and digital compensation software; the high-precision digital sensor has the compensation functions of linearity, hysteresis and creep, and the digital compensation software is matched with the temperature sensor and has the real-time temperature compensation function; and after the original data are compensated, the original data are transmitted to the signal processing module through the RS485 interface.
8. The intelligent belt scale of claim 1, wherein after the signal processing module receives the weight data and the speed data, the processing step comprises:
step S101, averaging all the weight data obtained in a sampling period T to obtain a weight average value;
step S102, integrating the weight average value by using a speed signal acquired by the velometer to obtain instantaneous flow;
and step S103, reporting the instantaneous flow.
9. The intelligent belt scale of claim 1, wherein after the signal processing module receives the weight data and the speed data, the processing step comprises:
step S201, eliminating a maximum weight value and a minimum weight value from all the weight data obtained in a sampling period T;
step S202, averaging the weight data after the maximum weight value and the minimum weight value are eliminated to obtain a standard reference value;
step S203, comparing all the weight data obtained in a sampling period T with the standard reference value, and eliminating the weight data which are not in the positive and negative thresholds of the standard reference value to obtain an optimized weight data set;
step S204, averaging the optimized weight data set to obtain a weight average value;
step S205, integrating the weight average value by using the speed signal collected by the velometer to obtain instantaneous flow;
and step S206, reporting the instantaneous flow.
10. The intelligent belt scale of claim 9, wherein the threshold is 20%.
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| CN202010522700.2A CN111623857A (en) | 2020-06-10 | 2020-06-10 | High-precision multi-point metering intelligent belt scale |
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| JPH03274424A (en) * | 1990-03-26 | 1991-12-05 | Shiyuzui Honten:Kk | Measuring method of object to be transferred with large variation of flow rate by belt scale |
| CN101113923A (en) * | 2007-07-23 | 2008-01-30 | 南京三埃测控有限公司 | Bulk material high precision belt weighing array system |
| CN101122778A (en) * | 2007-09-19 | 2008-02-13 | 山西万立科技有限公司 | Embedded type weighing system based on intelligent fuzzy control |
| CN201159664Y (en) * | 2008-02-21 | 2008-12-03 | 无锡跃进科技有限公司 | Electronic belt conveyor scale |
| CN202033095U (en) * | 2011-03-21 | 2011-11-09 | 白银有色集团股份有限公司 | Fixing device for speed measuring drum of electronic scale |
| CN103630217A (en) * | 2012-08-28 | 2014-03-12 | 厦门烟草工业有限责任公司 | Electronic scale outlet balance flow control method |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03274424A (en) * | 1990-03-26 | 1991-12-05 | Shiyuzui Honten:Kk | Measuring method of object to be transferred with large variation of flow rate by belt scale |
| CN101113923A (en) * | 2007-07-23 | 2008-01-30 | 南京三埃测控有限公司 | Bulk material high precision belt weighing array system |
| CN101122778A (en) * | 2007-09-19 | 2008-02-13 | 山西万立科技有限公司 | Embedded type weighing system based on intelligent fuzzy control |
| CN201159664Y (en) * | 2008-02-21 | 2008-12-03 | 无锡跃进科技有限公司 | Electronic belt conveyor scale |
| CN202033095U (en) * | 2011-03-21 | 2011-11-09 | 白银有色集团股份有限公司 | Fixing device for speed measuring drum of electronic scale |
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