CN112985551A - Electronic belt scale electrical parameter testing method based on virtual instrument - Google Patents
Electronic belt scale electrical parameter testing method based on virtual instrument Download PDFInfo
- Publication number
- CN112985551A CN112985551A CN202110173604.6A CN202110173604A CN112985551A CN 112985551 A CN112985551 A CN 112985551A CN 202110173604 A CN202110173604 A CN 202110173604A CN 112985551 A CN112985551 A CN 112985551A
- Authority
- CN
- China
- Prior art keywords
- belt
- weight
- scale
- labview
- sensor
- 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.)
- Pending
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 21
- 230000005484 gravity Effects 0.000 claims abstract description 12
- 238000005303 weighing Methods 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 20
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000010421 standard material Substances 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000006870 function Effects 0.000 abstract description 5
- 238000007620 mathematical function Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/14—Devices for determining tare weight or for cancelling out the tare by zeroising, e.g. mechanically operated
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Conveyors (AREA)
Abstract
The invention provides an electronic belt scale electrical parameter testing method based on a virtual instrument, which comprises the following steps: s1, a connecting system, wherein a speed measurement sensor and a gravity sensor are arranged on rotating shafts of a plurality of carrier rollers rotating by a belt, two data acquisition cards are respectively connected with the gravity sensor and the speed measurement sensor, the data acquisition cards are merged into a case, and are connected into a PC (personal computer) through a USB (universal serial bus) interface, and LabVIEW software installed in the PC is used; s2, deducting the dead weight of the belt and the scale frame, and measuring the weight by adopting a weighing bridge frame and a resistance strain sensor; and S3, accumulating the material flow M in the time interval t. The invention adopts a virtual instrument graphical software programming technology and a powerful mathematical function library of LabVIEW to display and integrate the acquired data, so that the LabVIEW graphical software integrated instrument has the basic functions of the traditional instrument, and simultaneously fully utilizes the advantages of LabVIEW graphical language programming to develop a good human-computer interface.
Description
Technical Field
The invention relates to the technical field of belt weighers, in particular to a virtual instrument-based method for testing electrical parameters of an electronic belt weigher.
Background
The electronic belt scale is a device capable of continuously weighing the weight of bulk granular materials, not only can weigh the weight of the materials conveyed on a conveying belt at a certain moment, but also can cumulatively weigh the total weight of the conveyed materials within a certain period of time. Therefore, the electronic belt scale is widely applied to occasions such as coal mines, cement, chemical industry, granaries, wharfs and the like.
The main components of the electronic belt scale are measuring sensor (weighing and speed measuring), bearing device (scale frame), signal processing device (amplifying and integrating device) and display. The sensor detects the parameters, converts the parameters into electric signals, needs signal processing and finally displays the measured values. The existing belt scale electric detection part is mostly composed of an amplifier, a multiplier, an integrator, a frequency/voltage converter, a display instrument, or hardware such as a single chip microcomputer, an LED or an LCD display, and the like, as shown in fig. 1-2, two paths of signals obtained by measuring through a sensor are amplified through a signal amplifier, then are sent to the multiplier and the integrator, and then are sent to the display instrument for display; as shown in fig. 2, a test circuit is formed by a single chip microcomputer, signals collected by the sensor are amplified by circuits such as an operational amplifier and the like, then are subjected to a/D conversion by an analog-to-digital conversion chip, and then converted results are sent to the single chip microcomputer and are displayed on an LED or an LCD through driving display. At each step, hardware circuitry is required to implement the various functions.
The whole measurement process needs more hardware equipment, so the defects of poor flexibility, low precision, poor reliability, unfriendly man-machine interaction interface and the like exist.
Disclosure of Invention
Aiming at the defects in the background technology, a virtual instrument is adopted, and software programming is emphasized to replace partial hardware equipment so as to measure and display the electric parameters of the belt scale and achieve the purposes of high measurement precision, strong reliability, stable performance and excellent man-machine interaction interface, therefore, the invention provides a method for testing the electric parameters of the electronic belt scale based on the virtual instrument, and the specific scheme is as follows:
a virtual instrument based electronic belt scale electrical parameter testing method comprises the following steps:
s1, connecting a system, wherein a speed measuring sensor is arranged on a roller of a driven wheel, a gravity sensor is used for detecting the pressure of a carrier roller, two data acquisition cards are respectively connected with the gravity sensor and the speed measuring sensor, the data acquisition cards are merged into a case, are connected into a PC (personal computer) through a USB (universal serial bus) interface and use LabVIEW software installed in the PC;
s2, deducting the dead weight of the belt and the scale frame, and measuring the weight by adopting a weighing bridge frame and a resistance strain sensor;
and S3, accumulating the material flow M in the time interval t.
Specifically, the specific steps of step S2 are as follows:
s21, when the material on the belt passes through the top of the scale frame, the material weight W (t) of the electronic belt scale in a certain weighing interval L under the condition of deducting the self weight is as follows:
W(t)＝(G-Z)×L
wherein G represents the gross weight of the material per unit length of the belt, and kg/m; z represents the zero value of the weight of the belt and the scale frame, and L represents the interval length;
s22, obtaining an output voltage signal U1 of the gravity sensor and a voltage signal U2 of the speed measuring sensor after frequency or voltage conversion, multiplying the voltage signal U1 and the voltage signal U2 by a multiplier, outputting the multiplied voltage signals to a PC (personal computer), and obtaining the instantaneous weight Q (t) of the belt in unit time by the PC, wherein the instantaneous weight Q (t) is as follows:
Q(t)＝L×(G-Z)×v(t)
wherein Q (t) represents the weight of the transported material per unit time in kilograms per second; v (t) represents belt speed, m/sec.
Specifically, step S3 specifically includes:
integrating Q (t) over time, and accumulating the material flow M in the time interval t as:
wherein k is the range coefficient and Z is the dynamic zero value in the integral formula, i.e. the dynamic tare weight of the belt and scale frame.
Specifically, the method of determining the weight Z of the belt and the scale in step S21 includes: the zero value is the average value of a circle of the running of an empty belt, the calculation process of the dynamic zero value is called zero setting, the zero setting is realized by pressing a zero setting key of an analog icon key on a designed front panel and realizing the operation by a zero setting subprogram.
Specifically, the equation coefficient value K in step S22 is obtained by: firstly, a standard material or a standard weight passes through a belt scale, then the weight value of the passed standard material is input at the zero calibration position of a front panel, and then a measuring range coefficient K is calculated by software.
The invention has the beneficial effects that: the invention adopts the virtual instrument software programming technology to display and integrate data, so that the virtual instrument software programming technology has the basic functions of the traditional instrument, fully utilizes the advantages of LabVIEW graphical language programming and develops a good human-computer interface. The front panel simulates a real instrument panel, interacts with a user, and the program block diagram realizes logic functions, performs data acquisition, operation, storage and other operations, and is equivalent to a functional component in an instrument box. Compared with the prior art which uses a hardware circuit, the developed electrical detection method takes graphical software as a core. The application provides a software-based measurement method. Compared with the defect that measurement is realized by depending on a hardware circuit and a plurality of discrete instruments in the prior art, the method takes LabVIEW software as a core and is assisted by a small amount of hardware, a virtual operation interface is designed on a PC display screen, the software is simple to maintain, the product updating period is short, and the method is a testing method for replacing instruments by software.
Drawings
FIG. 1 is a block diagram of a prior art instrument composition test circuit;
FIG. 2 is a block diagram of a prior art monolithic computer composition test circuit;
FIG. 3 is a schematic diagram of the system components of the present method;
fig. 4 is a system software modularization flow chart.
In the figure: 1. a speed measuring sensor; 2. a gravity sensor; 3. a carrier roller; 4. material preparation; 5. leather belt
Detailed Description
Referring to fig. 3-4, a virtual instrument-based electronic belt scale electrical parameter testing method includes the following steps:
s1, connecting a system, wherein the speed measuring sensor 1 is arranged on a roller of a driven wheel, the gravity sensor is used for detecting the pressure of the carrier roller 3, two data acquisition cards are respectively connected with the gravity sensor 2 and the speed measuring sensor 1, the data acquisition cards are merged into a case, and are accessed into a PC (personal computer) through a USB (universal serial bus) interface, and LabVIEW software installed in the PC is used; .
S2, deducting the dead weight of the belt 5 and the scale frame, and measuring the weight by adopting a weighing bridge frame and a resistance strain sensor; the method comprises the following specific steps:
s21, when the material 4 on the belt 5 passes through the top of the scale frame, the weight W (t) of the material 4 in a certain weighing interval L of the electronic belt 5 scale is as follows under the condition of deducting the self weight:
W(t)＝(G-Z)×L
wherein G represents the gross weight of the material 4 per unit length of the belt 5, kg/m; z represents the zero value of the weight of the belt 5 and the scale stand, L represents the interval length;
specifically, the zero value of the weight is the average value of the empty belt running for one circle, the dynamic zero value is obtained by zeroing, the zeroing is realized by changing the state of a zeroing key, and the changed state is uploaded to the PC. The solving method of the step is realized by LabVIEW software, and the LabVIEW compiles subprograms, wherein each subprogram comprises a front panel, a program block diagram and an icon.
S22, obtaining an output voltage signal U1 of the gravity sensor 2, converting a voltage signal U2 output by the speed measuring sensor 1 through frequency or voltage conversion into a digital quantity through A/D conversion by a data acquisition card, inputting the digital quantity into a PC, multiplying the corresponding voltage signal U1 and the corresponding voltage signal U2 by a multiplier of a mathematical operation tool in LabVIEW to obtain the instantaneous weight Q (t) of the belt 5 in unit time, wherein the instantaneous weight Q (t) is as follows:
Q(t)＝L×(G-Z)×v(t)
wherein Q (t) represents the weight of the transported material 4 per unit time in kg/sec; v (t) represents the belt 5 speed, m/s;
s3, integrating q (t) with time, and calculating the cumulative flow M of the material 4 in the time interval t as:
where k is the range coefficient and Z is the dynamic zero value in the integral formula, i.e. the dynamic tare weight of the belt 5 and scale frame.
In step S21, the method for determining the weight Z of the belt 5 and the scale frame is: the zero value of the weight is the average value of the empty belt 5 running for one circle, the calculation process of the dynamic zero value is zero adjustment, the zero adjustment is carried out by changing the state of a zero adjustment key, and the changed state is uploaded to the PC.
The method for obtaining the range coefficient value K in step S22 is: firstly, a standard material 4 or a standard weight passes through a belt 5 scale, then the weight value of the passed standard material 4 is input at the zero calibration position of a front panel, and then a measuring range coefficient K is calculated.
The whole operation is realized by a 'mathematic' operation tool carried by LabVIEW software.
The application adopts LabVIEW software installed by a PC, adopts the programming characteristics of structuralization and modularization to program each module, is called as a subprogram, and has the following use steps:
the method comprises the following steps of compiling a 'login' subprogram, entering a system 'main menu' module after success, wherein the main menu adopts a 'While circulation' structure, and the circulation comprises a parameter setting (comprising an 'alarm threshold value', 'zero calibration standard value', 'start-stop' setting and inputting control), a 'data acquisition' subprogram, an 'alarm' subprogram and the like, wherein the data acquisition comprises a 'weighing instantaneous acquisition', 'weighing accumulation' subprogram, a 'display', 'zero calibration' and a 'data storage' subprogram:
(1) collecting various parameters such as weighing parameters, belt 5 rotating speed and the like in real time, and simultaneously creating an instrument front panel;
(2) by utilizing a LabVIEW graphical programming mode, calling a numerical value → a display control, a waveform → a waveform chart and a table control in a front panel control, namely displaying and recording measurement information in real time in various modes such as numbers, graphs and tables, carrying out subtraction operation on an actual value and a set value, and outputting and calling a Boolean → indicator lamp control to enable the front panel control to have an overrun alarm function;
(3) the test data is stored, and the reading is convenient.
After all the parameters are detected, the parameters are transmitted to a data acquisition card, sent to a computer, and subjected to graphical programming by LabVIEW software, so that real-time parameters are displayed on a computer display screen, and the motor of the belt 5 is controlled to run and start and stop. The electrical measurement system has good stability and high accuracy, and is convenient to install and debug. The LabVIEW software is characterized by being structured and modularized in programming, the modules are programmed one by one and called at any time, and a software flow chart is shown in figure 4.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A virtual instrument based electronic belt scale electrical parameter testing method is characterized by comprising the following steps:
s1, connecting a system, wherein a speed measuring sensor is arranged on a roller of a driven wheel, a gravity sensor is used for detecting the pressure of a carrier roller, two data acquisition cards are respectively connected with the gravity sensor and the speed measuring sensor, the data acquisition cards are merged into a case, are connected into a PC (personal computer) through a USB (universal serial bus) interface and use LabVIEW software installed in the PC;
s2, deducting the dead weight of the belt and the scale frame, and measuring the weight by adopting a weighing bridge frame and a resistance strain sensor;
and S3, accumulating the material flow M in the time interval t.
2. The method for testing the electrical parameters of the electronic belt scale based on the virtual instrument as claimed in claim 1, wherein the step S2 comprises the following steps:
s21, when the material on the belt passes through the top of the scale frame, the material weight W (t) of the electronic belt scale in a certain weighing interval L under the condition of deducting the self weight is as follows:
W(t)＝(G-Z)×L
wherein G represents the gross weight of the material per unit length of the belt, and kg/m; z represents the zero value of the weight of the belt and the scale frame, and L represents the interval length;
s22, obtaining an output voltage signal U1 of the gravity sensor, converting a voltage signal U2 output by the speed measuring sensor through frequency or voltage conversion into a digital quantity through A/D conversion by a data acquisition card, inputting the digital quantity into a PC, multiplying the corresponding voltage signal U1 and the corresponding voltage signal U2 by a multiplier of a mathematical operation tool in LabVIEW, outputting the voltage signal U1 and the voltage signal U2 to the PC, and obtaining the instantaneous weight Q (t) of the belt in unit time by the PC, wherein the instantaneous weight Q (t) is as follows:
Q(t)＝L×(G-Z)×v(t)
wherein Q (t) represents the weight of the transported material per unit time in kilograms per second; v (t) represents belt speed, m/sec.
3. The method for testing the electrical parameters of the electronic belt scale based on the virtual instrument as claimed in claim 1, wherein the step S3 is specifically as follows:
integrating Q (t) over time, and accumulating the material flow M in the time interval t as:
wherein k is the range coefficient and Z is the dynamic zero value in the integral formula, i.e. the dynamic tare weight of the belt and scale frame.
4. The method as claimed in claim 1, wherein the method for determining the weight Z of the belt and the frame in step S21 comprises: the zero value of the weight is the average value of the empty belt running for one circle, the calculation process of the dynamic zero value is zero adjustment, the zero adjustment is carried out by changing the state of a zero adjustment key, and the changed state is uploaded to the PC.
5. The method as claimed in claim 1, wherein the step S22 of determining the value of the measurement coefficient K is as follows: firstly, a standard material or a standard weight passes through a belt scale, then a passing standard material weight value is input at a zero calibration position of a front panel, and a measuring range coefficient K is calculated by a function tool carried by LabVIEW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110173604.6A CN112985551A (en) | 2021-02-06 | 2021-02-06 | Electronic belt scale electrical parameter testing method based on virtual instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110173604.6A CN112985551A (en) | 2021-02-06 | 2021-02-06 | Electronic belt scale electrical parameter testing method based on virtual instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112985551A true CN112985551A (en) | 2021-06-18 |
Family
ID=76347803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110173604.6A Pending CN112985551A (en) | 2021-02-06 | 2021-02-06 | Electronic belt scale electrical parameter testing method based on virtual instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112985551A (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1052372A (en) * | 1989-12-06 | 1991-06-19 | 首都钢铁公司 | Microcomputer controlled nucleon operated belt conveyor scale |
| EP0565740A1 (en) * | 1992-04-11 | 1993-10-20 | Carl Schenck Ag | Method and apparatus for determining the extraction flow rate of a belt weigher |
| EP1371955A1 (en) * | 2002-06-14 | 2003-12-17 | Mettler-Toledo GmbH | Object-oriented method, system and software for a gravimetric measuring device |
| WO2010068697A2 (en) * | 2008-12-09 | 2010-06-17 | Datalogic Scanning, Inc. | Systems and methods for reducing weighing errors associated with partially off-scale items |
| CN102175569A (en) * | 2011-03-01 | 2011-09-07 | 武汉理工大学 | Underground iron ore dynamic weighing and real-time grate analyzing method |
| CN102853888A (en) * | 2012-09-12 | 2013-01-02 | 西南石油大学 | Multifunctional high-precision weighing system based on virtual technology |
| CN203349907U (en) * | 2013-07-10 | 2013-12-18 | 李向阳 | Dynamic zero point belt weigher |
| US20160252387A1 (en) * | 2012-10-15 | 2016-09-01 | Purolator Inc. | System, method, and computer readable medium for determining the weight of items in non-singulated and non-spaced arrangements on a conveyor system |
| CN106482813A (en) * | 2015-08-24 | 2017-03-08 | 黑龙江省康格尔科技有限公司 | A kind of using method of suspension electronic belt weighing device |
| CN107036689A (en) * | 2016-12-02 | 2017-08-11 | 江苏师范大学 | A kind of adhesive tape conveyor conveying capacity on-line monitoring method and its device |
| CN206725056U (en) * | 2017-05-26 | 2017-12-08 | 福建科达衡器有限公司 | A kind of four carrying roller belted electronic balances of port and pier |
| WO2018000802A1 (en) * | 2016-06-27 | 2018-01-04 | 山西新元自动化仪表有限公司 | Impact plate belt scale and weighing method thereof |
| CN108151836A (en) * | 2017-12-14 | 2018-06-12 | 徐州格雷安环保设备有限公司 | A kind of high-precision suspension array belt weigher |
| CN110926573A (en) * | 2018-09-19 | 2020-03-27 | 深圳龙澄高科技环保股份有限公司 | Dynamic weighing system |
| CN111157085A (en) * | 2019-12-26 | 2020-05-15 | 中交一航局安装工程有限公司 | Array type belt conveyor weighing device and installation process thereof |
-
2021
- 2021-02-06 CN CN202110173604.6A patent/CN112985551A/en active Pending
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1052372A (en) * | 1989-12-06 | 1991-06-19 | 首都钢铁公司 | Microcomputer controlled nucleon operated belt conveyor scale |
| EP0565740A1 (en) * | 1992-04-11 | 1993-10-20 | Carl Schenck Ag | Method and apparatus for determining the extraction flow rate of a belt weigher |
| EP1371955A1 (en) * | 2002-06-14 | 2003-12-17 | Mettler-Toledo GmbH | Object-oriented method, system and software for a gravimetric measuring device |
| WO2010068697A2 (en) * | 2008-12-09 | 2010-06-17 | Datalogic Scanning, Inc. | Systems and methods for reducing weighing errors associated with partially off-scale items |
| CN102175569A (en) * | 2011-03-01 | 2011-09-07 | 武汉理工大学 | Underground iron ore dynamic weighing and real-time grate analyzing method |
| CN102853888A (en) * | 2012-09-12 | 2013-01-02 | 西南石油大学 | Multifunctional high-precision weighing system based on virtual technology |
| US20160252387A1 (en) * | 2012-10-15 | 2016-09-01 | Purolator Inc. | System, method, and computer readable medium for determining the weight of items in non-singulated and non-spaced arrangements on a conveyor system |
| CN203349907U (en) * | 2013-07-10 | 2013-12-18 | 李向阳 | Dynamic zero point belt weigher |
| CN106482813A (en) * | 2015-08-24 | 2017-03-08 | 黑龙江省康格尔科技有限公司 | A kind of using method of suspension electronic belt weighing device |
| WO2018000802A1 (en) * | 2016-06-27 | 2018-01-04 | 山西新元自动化仪表有限公司 | Impact plate belt scale and weighing method thereof |
| CN107036689A (en) * | 2016-12-02 | 2017-08-11 | 江苏师范大学 | A kind of adhesive tape conveyor conveying capacity on-line monitoring method and its device |
| CN206725056U (en) * | 2017-05-26 | 2017-12-08 | 福建科达衡器有限公司 | A kind of four carrying roller belted electronic balances of port and pier |
| CN108151836A (en) * | 2017-12-14 | 2018-06-12 | 徐州格雷安环保设备有限公司 | A kind of high-precision suspension array belt weigher |
| CN110926573A (en) * | 2018-09-19 | 2020-03-27 | 深圳龙澄高科技环保股份有限公司 | Dynamic weighing system |
| CN111157085A (en) * | 2019-12-26 | 2020-05-15 | 中交一航局安装工程有限公司 | Array type belt conveyor weighing device and installation process thereof |
Non-Patent Citations (1)
| Title |
|---|
| 魏丽: "基于LabVIEW的动态称重系统的设计", 《唐山学院学报》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106442888B (en) | Automobile environment-protection exhaust pollution analyte detection chassis dynamometer integrated correction system | |
| CN107478382B (en) | Automatic detection device and detection method for pressure instrument | |
| CN102879457B (en) | 3-dimensional metal magnetic memory detector device and detection method | |
| CN105629052A (en) | Chip power consumption real-time detection method | |
| Moghavvemi et al. | A reliable and economically feasible remote sensing system for temperature and relative humidity measurement | |
| CN106382977A (en) | Temperature compensating method for improving truck scale accuracy | |
| Wedha et al. | Design and build Mini Digital Scale using internet of things | |
| CN112985551A (en) | Electronic belt scale electrical parameter testing method based on virtual instrument | |
| US7104139B2 (en) | System and method for load sensing using piezoelectric effect | |
| CN101929936A (en) | Book defect automatic detection method and detection device | |
| CN107607144B (en) | Sensor baseline drift correction method and detection equipment | |
| Chen et al. | Embedded electronic scale measuring system based on STM32 single chip microcomputer | |
| CN110926573A (en) | Dynamic weighing system | |
| CN107607143A (en) | A kind of method and detection device of sensor base line drift correction | |
| Ge et al. | High precision weight measurement of liquid viscosity | |
| CN201094091Y (en) | Electronic scale checking apparatus | |
| CN2160111Y (en) | Portable intelligent temperature detection calibrator | |
| CN112462597A (en) | Coal quantity logic calculation method for coal feeder by adopting SAMA (sampling and analysis) diagram | |
| Huang et al. | Wireless voltage and resistance meter based on STC89S52 and bluetooth module HC-05 | |
| CN110595932A (en) | Device and method for measuring weight concentration of ore pulp | |
| Hamdi | Design of a Rice Weighing Tool with Sound Output Using Arduino Uno | |
| CN100357707C (en) | Hand-held multifunctional instrument for testing, analyzing and recording dynamic signal | |
| CN2674088Y (en) | Instrument for testing resistivity of well drilling liquid | |
| Bogrekci et al. | Development of Load Cell and Real Time Force Measurement System | |
| Song et al. | Design of a simple and multifunctional liquid parameter measuring instrument based on MSP430 single chip microcomputer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210618 |