CN110991599A - Paper counting display device - Google Patents
Paper counting display device Download PDFInfo
- Publication number
- CN110991599A CN110991599A CN201911382135.8A CN201911382135A CN110991599A CN 110991599 A CN110991599 A CN 110991599A CN 201911382135 A CN201911382135 A CN 201911382135A CN 110991599 A CN110991599 A CN 110991599A
- Authority
- CN
- China
- Prior art keywords
- module
- plate
- paper
- sensor circuit
- control module
- 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.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
- G06M7/00—Counting of objects carried by a conveyor
- G06M7/02—Counting of objects carried by a conveyor wherein objects ahead of the sensing element are separated to produce a distinct gap between successive objects
- G06M7/06—Counting of flat articles, e.g. of sheets of paper
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
- G06M1/00—Design features of general application
- G06M1/27—Design features of general application for representing the result of count in the form of electric signals, e.g. by sensing markings on the counter drum
- G06M1/272—Design features of general application for representing the result of count in the form of electric signals, e.g. by sensing markings on the counter drum using photoelectric means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention provides a paper counting display device, which comprises a DSP control module, a sensor circuit, a paper measuring device module, a serial port communication module, an auxiliary power supply module, a liquid crystal display module and keys, wherein the DSP control module is used for controlling the paper counting display device; the liquid crystal display module and the keys are connected with the DSP control module, the DSP control module is connected with the sensor circuit through the serial port communication module, and the sensor circuit is connected with the paper measuring device module; and the DSP control module and the sensor circuit are connected with the auxiliary power supply module. The invention has two working modes of self-calibration and formal measurement, and can be automatically switched by setting a key. The invention has the advantages of low design cost, low power loss, high sensitivity, high resolution, strong reliability, strong anti-electromagnetic interference capability, wide application range and good practical value.
Description
Technical Field
The invention relates to the technical field of paper counting, in particular to a paper counting display device.
Background
Paper count is very common operation in people's life, the industrial production, and current paper all goes on through the mode of assembly line in process of production, and the paper that accomplishes processing earlier stage is through carrying the bench at the paper and carrying, then packs together appointed quantity of paper. Today, the computer technology is developing at a high speed, most of the paper counting work is still completed by adopting a special paper counter. Generally, a counter is arranged on a paper conveying table to count the number of the paper conveyed on the conveying table, and a worker stops the equipment after reaching a specified number on the counter and then packs the paper. Because human vision and physical power all have certain limit, long-time paper products index causes very big examination to the manual work, its count is with high costs, precision stability is poor, and some printing factories avoid the printed matter to be impaired, and practical electronic scale estimates paper quantity through the mode of weight demarcation, owing to receive the influence of air humidity, paper homogeneity, counter precision itself, and the accuracy of the paper count result that reachs can't obtain guaranteeing.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a paper counting display device, which solves the technical problem of low precision of the existing paper counter.
The technical scheme of the invention is realized as follows:
a paper counting display device comprises a DSP control module, a sensor circuit, a paper measuring device module, a serial port communication module, an auxiliary power supply module, a liquid crystal display module and keys; the liquid crystal display module and the keys are connected with the DSP control module, the DSP control module is connected with the sensor circuit through the serial port communication module, and the sensor circuit is connected with the paper measuring device module; and the DSP control module and the sensor circuit are connected with the auxiliary power supply module.
The paper measuring device module includes a plate capacitor connected to the sensor circuit.
The plate capacitor comprises a plate A and a plate B, wherein the plate A is connected with the sensor circuit through a lead a, and the plate B is connected with the sensor circuit through a lead B; the polar plate A is positioned right above the polar plate B, and a gap is reserved between the polar plate A and the polar plate B.
The sensor circuit is an MSP430 module, and the liquid crystal display module is an LCD.
The capacitance C between the polar plate A and the polar plate B is as follows:
wherein, in the step (A),
，
is the distance between the polar plate A and the polar plate B,Sthe area of the positive electrode plate A and the positive electrode plate B is just opposite,
in order to have a dielectric constant,
in order to have a dielectric constant in a vacuum,
is the relative dielectric constant.
The capacitance value of the capacitance C is calculated by the following method: according to the oscillation condition of the LC oscillation circuit: capacitive reactance equals inductive reactance, resulting in: x C1 +X C2 =X L Wherein X is C1 Is capacitive reactance of the capacitor to be measured, X C2 Is capacitor capacitance reactance, X, in LC oscillating circuit L Is the inductive reactance of an inductor in an LC oscillating circuit,ffrequency of LC oscillating circuit, X C1 = 1/(2πf*C 1 )，X C2 = 1/(2πf*C 2 )，X L = 2πfL，C 1 In order to measure the capacitance of the capacitor to be measured,C 2 is the capacitor capacitance, and L is the inductor inductance; the capacitance of the capacitor to be measuredC 1 = C 2 /((2πf) 2 *L*C 2 - 1)。
A method for using a paper counting display device comprises the following steps:
step one, connecting a polar plate A and a polar plate B with a power supply;
initializing an interruption interval t, and interrupting after every interval t time;
initializing LCD liquid crystal display, reading a state value of a measuring key, judging whether measurement is started or not, if so, updating the LCD liquid crystal display and sending out a buzzing sound by a buzzer of a DSP control module, otherwise, setting the state value of the measuring key to be 0, and ending the interrupt execution step IV;
step four, the sensor circuit detects the capacitance value between the polar plate A and the polar plate B in real time to form capacitance parameters, and the capacitance parameters are transmitted to the DSP control module after M times of average values are obtained;
step five, the DSP control module receives data of the sensor circuit and compares the data with a preset numerical value interval to judge the number of paper sheets;
and step six, scanning the mechanical keys connected with the DSP control module row by row and column by column to judge whether a preset measuring key is pressed down, if so, the state value of the measuring key is 1, returning to the step four, otherwise, the state value of the measuring key is 0, and circularly executing the step four.
The beneficial effect that this technical scheme can produce: the invention can freely switch two working modes of self calibration and formal measurement by setting the key; the invention has the advantages of low design cost, low power loss, high sensitivity, high resolution, strong reliability, strong anti-electromagnetic interference capability, wide application range and good practical value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a block diagram of a measurement system according to the present invention;
FIG. 3 is a graph of typical oscillation frequency versus load capacitance;
FIG. 4 is a graph of exemplary oscillation frequency versus load capacitance;
FIG. 5 is an overall power block diagram of the present invention;
FIG. 6 is a measurement flow chart of the present invention;
FIG. 7 is a flowchart of an interrupt routine of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Embodiment 1, the present invention provides a paper counting display device, as shown in fig. 2, including a DSP control module, a sensor circuit, a paper measuring device module, a serial communication module, an auxiliary power supply module, a liquid crystal display module, and a key; the liquid crystal display module and the keys are connected with the DSP control module, the DSP control module is connected with the sensor circuit through the serial port communication module, and the sensor circuit is connected with the paper measuring device module; the DSP control module and the sensor circuit are both connected with the auxiliary power supply module, the input voltage of the auxiliary power supply module is 220V, and the output voltage of the auxiliary power supply module is 5V. The sensor circuit is an MSP430 module, the MSP430 module has low system power consumption, low working voltage and high data sampling speed, data storage and transmission speed, and can finish the transmission of a large amount of data in a short time; meanwhile, the device has built-in communication capability with a universal serial communication interface, is better communicated with a system main control module to realize rapid data transmission, selects a TI corporation MSP430 development board as a capacitance sensor, and mainly comprises an MSP430G2553, an MSP430F1612, an SBW & UART interface and a buck chip module. The DSP control module adopts a DSP chip, a Harvard structure with separated programs and data is adopted in the DSP chip, a special high-speed hardware multiplier is provided, assembly line operation is widely adopted, a special DSP instruction is provided, the execution time of a single instruction is 8-10 times faster than that of a 16-bit single-chip microcomputer, one-time multiplication and addition operation is 16-30 times faster, and various digital signals can be processed in a short time. The liquid crystal display module is an LCD liquid crystal display, and the LCD liquid crystal display has the advantages of large display information quantity, high display quality, low power consumption, long service life and the like.
As shown in fig. 1, the sheet measuring device module includes a plate capacitor connected to a sensor circuit. The plate capacitor comprises a plate A and a plate B, wherein the plate A is connected with the sensor circuit through a lead a, and the plate B is connected with the sensor circuit through a lead B; the polar plate A is positioned right above the polar plate B, and a gap is reserved between the polar plate A and the polar plate B. When the fringe effect is not considered, the capacitance C between the plate A and the plate B is:
wherein, in the step (A),
，
is the distance between the polar plate A and the polar plate B,Sthe area of the positive electrode plate A and the positive electrode plate B is just opposite,
in order to have a dielectric constant,
in order to have a dielectric constant in a vacuum,
is the relative dielectric constant. By applying paper between plates A and B, the capacitorɛThe value will change, thus changing the capacity value, and the corresponding capacity values of the paper sheets with different numbers will be different. And converting the change into frequency change by detecting the change of the capacity value, and finally calculating the number of the added paper according to the frequency under different capacity values.
The present invention uses the MSP430 module as a low cost sensor system responsible for capturing and converting the varying capacitance measurements to frequency values, and then utilizes I2C, the communication transmits the data to the DSP control module. In a hardware circuit, the pins capable of realizing the capacitance sensing function are P2.0, P2.1, P2.2, P2.3, P2.4 and P2.5, and the invention actually adopts the P2.0 and GND pins as the terminals of the paper measuring device. The process of detecting the conversion of the capacitance into the frequency is mainly performed according to the typical characteristic of the MSP430, i.e. the pin oscillator frequency, and the relationship between the typical oscillation frequency and the load capacitance is shown in fig. 3 and 4 under different voltages.
The capacitance value of the capacitance C is calculated similarly to an LC oscillation circuit: according to the oscillation condition of the LC oscillation circuit: capacitive reactance equals inductive reactance, resulting in: x C1 +X C2 =X L Wherein X is C1 Is capacitive reactance of the capacitor to be measured, X C2 Is capacitor capacitance reactance, X, in LC oscillating circuit L Is the inductive reactance of an inductor in an LC oscillating circuit,ffrequency of LC oscillating circuit, X C1 = 1/(2πf*C 1 )，X C2 = 1/ (2πf*C 2 )，X L = 2πfL，C 1 In order to measure the capacitance of the capacitor to be measured,C 2 is the capacitor capacitance, and L is the inductor inductance; the capacitance of the capacitor to be measuredC 1 = C 2 /((2πf) 2 *L*C 2 -1). Therefore, the input end of each detection channel of the DSP chip is connected with an inductor and a capacitor to form an LC oscillating circuit, the sensing end of the capacitor to be detected is connected with the LC oscillating circuit,an oscillation frequency is generated, and the value of the capacitance to be measured can be calculated according to the frequency value.
Embodiment 2, as shown in fig. 6 and 7, a method for using a paper counting display device includes the following steps:
step one, connecting a polar plate A and a polar plate B with a power supply;
initializing an interruption interval t, and interrupting after every interval t time;
initializing LCD liquid crystal display, reading a state value of a measuring key, judging whether measurement is started or not, if so, updating the LCD liquid crystal display and sending out a buzzing sound by a buzzer of a DSP control module, otherwise, setting the state value of the measuring key to be 0, and ending the interrupt execution step IV;
step four, the sensor circuit detects the capacitance value between the polar plate A and the polar plate B in real time to form capacitance parameters, and the capacitance parameters are transmitted to the DSP control module after M times of average values are obtained;
step five, the DSP control module receives data of the sensor circuit and compares the data with a preset numerical value interval to judge the number of paper sheets;
and step six, scanning the mechanical keys connected with the DSP control module row by row and column by column to judge whether a preset measuring key is pressed down, if so, the state value of the measuring key is 1, returning to the step four, otherwise, the state value of the measuring key is 0, and circularly executing the step four.
Experiment and simulation
After the system is finished, the anti-interference capability of the whole system is tested, and the main test conditions are as follows: the indoor wind speed test method and the results are as follows:
the test method comprises the following steps: an air conditioner is arranged indoors, the temperature is set to be 25 ℃, the measuring distance is 1m, and the influence of the air conditioner on the stability of the system under low-speed, medium-speed and high-speed wind is tested respectively. The number of the paper sheets is fixed to be 20, and the average value of data acquired by the MSP430 module measured for 5 times at the same wind speed is 36560, 36528 and 36890 respectively. Therefore, the system has stronger anti-interference capability.
During the whole testing process of the paper measuring device system, errors mainly come from the following aspects:
(1) the small difference of the opposite area when the polar plate is placed;
(2) the pressure value when the polar plate clamps the A4 paper each time;
(3) and (4) whether sundries exist on the selected board surface when the copper-clad board is cut.
Based on the analysis, the invention adopts an object with fixed weight as a pressure source, selects the copper-clad plate with better plate surface, improves the mechanical structure of the measuring device, standardizes the operation of each measuring step and aims to further reduce the measuring error.
The TMS320F28335 chip-based minimum system board is used as a main control module, and the chip-based minimum system board comprises an RS232 serial interface, a reset key, a CAP1-3 and QEP interface and an external expansion interface module besides the chip. The MSP430 module is originally supplied with 3.3V power, and can be supplied with 5V power after the crystal oscillator is welded, and the overall power supply scheme of the system is shown in FIG. 5.
Self-calibration test: the quantity of 5, 10, 15, 20, 25, 30 and 35 is verified by taking 5A 4 papers as a verification unit, and a function curve of the variation of the analog capacity value along with the number of the papers is established by sections so as to determine the number judgment interval. It can be seen that a self-calibration function can be implemented.
Self-checking display test: the measuring polar plates A and B are separated, and whether the liquid crystal screen displays short circuit or not is observed: NO' will measure the pole plate A and the pole plate B contact, observe the LCD screen to show "whether short circuit: YES ". Therefore, the self-checking display function can be realized.
Number of sheets 1-10 tests: one to ten sheets of A4 paper are sequentially placed between the measuring polar plates A and B, measurement is started by one key, the number of the current measured paper displayed by the liquid crystal screen, whether the buzzer sounds or not, the data value collected by the MSP430 and the time from pressing the same measuring starting key to buzzing each time of measurement are recorded. As shown in Table 1, the number of sheets 1-10 tested met the system requirements of the present invention.
TABLE 1 measurement data Table
Number of sheets 15-30 tests: 15 to 30 pieces of A4 paper are sequentially placed between the measuring polar plates A and B, measurement is started by one key, the number of the current measured paper displayed by the liquid crystal screen, whether the buzzer sounds or not, the data value collected by the MSP430 and the time from pressing the same measuring starting key to sounding in each measurement are recorded. As shown in Table 2, the sheet number of 15-30 sheets tested satisfied the system requirements.
TABLE 2 measurement data Table
Number of sheets 30 or more: thirty or more pieces of A4 paper are sequentially placed between the measuring polar plates A and B, measurement is started by one key, the number of the current measured paper displayed by the liquid crystal screen, whether the buzzer sounds or not, the data value collected by the MSP430 and the time from pressing the same measuring starting key to sounding in each measurement are recorded. As shown in table 3, the number of sheets of 30 or more was tested to meet the system requirements.
TABLE 3 measurement data Table
According to the number results of the paper sheets in different ranges measured each time, the measurement precision of the system is high, and 100% of accuracy is achieved when 1-20 paper sheets and more than 30A 4 paper sheets are measured. Secondly, the data change collected from the MSP430 module each time can reflect that the system has certain stability. Finally, the system has higher sensitivity and can quickly display the number of the measured paper sheets after the measurement starting key is pressed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A paper counting display device is characterized by comprising a DSP control module, a sensor circuit, a paper measuring device module, a serial port communication module, an auxiliary power supply module, a liquid crystal display module and keys; the liquid crystal display module and the keys are connected with the DSP control module, the DSP control module is connected with the sensor circuit through the serial port communication module, and the sensor circuit is connected with the paper measuring device module; and the DSP control module and the sensor circuit are connected with the auxiliary power supply module.
2. The paper count display device of claim 1 wherein the paper measuring device module includes a plate capacitor, the plate capacitor being connected to the sensor circuit.
3. The paper count display device of claim 2, wherein the plate capacitor comprises a plate a and a plate B, the plate a being connected to the sensor circuit by a wire a, the plate B being connected to the sensor circuit by a wire B; the polar plate A is positioned right above the polar plate B, and a gap is reserved between the polar plate A and the polar plate B.
4. The paper count display device of claim 1, wherein the sensor circuit is an MSP430 module and the LCD module is an LCD.
5. The paper count display device of claim 1, wherein the capacitance C between plate a and plate B is:
wherein, in the step (A),
，
is the distance between the polar plate A and the polar plate B,Sthe area of the positive electrode plate A and the positive electrode plate B is just opposite,
in order to have a dielectric constant,
in order to have a dielectric constant in a vacuum,
is the relative dielectric constant.
6. The sheet count display device according to claim 5, wherein the capacitance value of the capacitance C is calculated by: according to the oscillation condition of the LC oscillation circuit: capacitive reactance equals inductive reactance, resulting in: x C1 +X C2 =X L Wherein X is C1 Is capacitive reactance of the capacitor to be measured, X C2 Is capacitor capacitance reactance, X, in LC oscillating circuit L Is the inductive reactance of an inductor in an LC oscillating circuit,ffrequency of LC oscillating circuit, X C1 = 1/(2πf*C 1 )，X C2 = 1/(2πf*C 2 )，X L = 2πfL，C 1 In order to measure the capacitance of the capacitor to be measured,C 2 is the capacitor capacitance, and L is the inductor inductance; the capacitance of the capacitor to be measuredC 1 = C 2 /((2πf) 2 *L*C 2 - 1)。
7. Use of the device according to any of claims 1-6, characterized in that it comprises the following steps:
step one, connecting a polar plate A and a polar plate B with a power supply;
initializing an interruption interval t, and interrupting after every interval t time;
initializing LCD liquid crystal display, reading a state value of a measuring key, judging whether measurement is started or not, if so, updating the LCD liquid crystal display and sending out a buzzing sound by a buzzer of a DSP control module, otherwise, setting the state value of the measuring key to be 0, and ending the interrupt execution step IV;
step four, the sensor circuit detects the capacitance value between the polar plate A and the polar plate B in real time to form capacitance parameters, and the capacitance parameters are transmitted to the DSP control module after M times of average values are obtained;
step five, the DSP control module receives data of the sensor circuit and compares the data with a preset numerical value interval to judge the number of paper sheets;
and step six, scanning the mechanical keys connected with the DSP control module row by row and column by column to judge whether a preset measuring key is pressed down, if so, the state value of the measuring key is 1, returning to the step four, otherwise, the state value of the measuring key is 0, and circularly executing the step four.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911382135.8A CN110991599B (en) | 2019-12-28 | 2019-12-28 | Paper count display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911382135.8A CN110991599B (en) | 2019-12-28 | 2019-12-28 | Paper count display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110991599A true CN110991599A (en) | 2020-04-10 |
| CN110991599B CN110991599B (en) | 2023-08-01 |
Family
ID=70078382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911382135.8A Active CN110991599B (en) | 2019-12-28 | 2019-12-28 | Paper count display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110991599B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111578831A (en) * | 2020-04-13 | 2020-08-25 | 芜湖职业技术学院 | Test paper quantity counting device and working method thereof |
| CN111595844A (en) * | 2020-06-03 | 2020-08-28 | 山西医科大学第二医院 | Glucometer test paper storage counting device and counting method thereof |
| CN112749775A (en) * | 2020-12-18 | 2021-05-04 | 杭州电子科技大学 | Paper counting assembly based on measure electric capacity |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007094957A (en) * | 2005-09-30 | 2007-04-12 | Oki Electric Ind Co Ltd | Paper sheet counter and paper sheet check system using the same |
| CN103363887A (en) * | 2012-04-11 | 2013-10-23 | 北京华夏聚龙自动化股份公司 | Novel material thickness measuring method |
| CN104161481A (en) * | 2014-09-01 | 2014-11-26 | 河海大学常州校区 | Capacitive intelligent management system for toilet paper boxes |
| CN205112662U (en) * | 2015-11-13 | 2016-03-30 | 天津艺虹印刷发展有限公司 | Printing machine paper feed count system |
| WO2017197574A1 (en) * | 2016-05-17 | 2017-11-23 | 深圳市汇顶科技股份有限公司 | Capacitance detection device |
| CN110598829A (en) * | 2019-09-16 | 2019-12-20 | 西安科技大学 | Paper quantity detection method and device |
| CN210466456U (en) * | 2019-10-16 | 2020-05-05 | 杭州师范大学钱江学院 | Paper quantity detection device based on capacitive sensor |
-
2019
- 2019-12-28 CN CN201911382135.8A patent/CN110991599B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007094957A (en) * | 2005-09-30 | 2007-04-12 | Oki Electric Ind Co Ltd | Paper sheet counter and paper sheet check system using the same |
| CN103363887A (en) * | 2012-04-11 | 2013-10-23 | 北京华夏聚龙自动化股份公司 | Novel material thickness measuring method |
| CN104161481A (en) * | 2014-09-01 | 2014-11-26 | 河海大学常州校区 | Capacitive intelligent management system for toilet paper boxes |
| CN205112662U (en) * | 2015-11-13 | 2016-03-30 | 天津艺虹印刷发展有限公司 | Printing machine paper feed count system |
| WO2017197574A1 (en) * | 2016-05-17 | 2017-11-23 | 深圳市汇顶科技股份有限公司 | Capacitance detection device |
| CN110598829A (en) * | 2019-09-16 | 2019-12-20 | 西安科技大学 | Paper quantity detection method and device |
| CN210466456U (en) * | 2019-10-16 | 2020-05-05 | 杭州师范大学钱江学院 | Paper quantity detection device based on capacitive sensor |
Non-Patent Citations (1)
| Title |
|---|
| 董明磊;赵春宇;陈大跃;: "数字式微电容测量***及其应用" * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111578831A (en) * | 2020-04-13 | 2020-08-25 | 芜湖职业技术学院 | Test paper quantity counting device and working method thereof |
| CN111595844A (en) * | 2020-06-03 | 2020-08-28 | 山西医科大学第二医院 | Glucometer test paper storage counting device and counting method thereof |
| CN112749775A (en) * | 2020-12-18 | 2021-05-04 | 杭州电子科技大学 | Paper counting assembly based on measure electric capacity |
| CN112749775B (en) * | 2020-12-18 | 2022-05-06 | 杭州电子科技大学 | Paper counting assembly based on measure electric capacity |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110991599B (en) | 2023-08-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110991599A (en) | Paper counting display device | |
| CN102187319B (en) | Apparatus and method for inspecting capacitive touch screen panel using LC resonant frequency variation | |
| CN101571468B (en) | Automatic detector for textural properties of hardness and viscosity of cooked rice grains | |
| CN201340367Y (en) | Material elastic property tester | |
| CN107085177B (en) | Ultrasonic water meter PCB circuit on-line detection method and device | |
| CN104215858A (en) | Constant temperature crystal oscillator temperature stability automatic test system and method | |
| CN201681147U (en) | Storage battery testing circuit | |
| CN2847282Y (en) | Novel textile fiber water content detector | |
| CN105022013B (en) | A kind of programmable resistance tester | |
| CN206804135U (en) | A kind of portable multi-function synthesis constitution analyzer and system | |
| CN211928089U (en) | Detection device for printed circuit board assembly | |
| CN2687684Y (en) | Digital capacitive-inductance measuring instrument | |
| CN204666458U (en) | Sour pick-up unit is inhaled in a kind of dividing plate pressurization | |
| CN204177955U (en) | The self-service calibrating installation of a kind of three-phase electric energy meter based on man-machine touth-interactive | |
| CN110244033B (en) | Portable urine detection device and detection method thereof | |
| CN112379206A (en) | Capacitive fingerprint module performance testing device and module performance testing method | |
| CN202256238U (en) | Portable edible oil quality test device | |
| CN218788021U (en) | Oxygen concentration and temperature tester and test tool | |
| CN201796001U (en) | Oil quality detector | |
| CN201673210U (en) | High frequency dielectric loss measurement apparatus for enamelled wires | |
| CN201413283Y (en) | Automatic detector for texture characteristics of rigidity and viscosity of cooked rice grain | |
| CN104655353A (en) | Micro power digital pressure gauge and pressure measuring method | |
| CN212620646U (en) | Temperature drift detection equipment of linear displacement sensor | |
| CN219066124U (en) | Device for detecting multipoint height difference of touch screen | |
| Wang et al. | The Design of Paper Calculator based on Capacitance Sensor |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |