CN206132191U - Tablet weighing device based on capacitance detector - Google Patents
Tablet weighing device based on capacitance detector Download PDFInfo
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- CN206132191U CN206132191U CN201621208062.2U CN201621208062U CN206132191U CN 206132191 U CN206132191 U CN 206132191U CN 201621208062 U CN201621208062 U CN 201621208062U CN 206132191 U CN206132191 U CN 206132191U
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Abstract
Tablet weighing device based on capacitance detector relates to the weighing -appliance, and the purpose is in order to solve the current problem that the weighing device precision is poor, bulky and the price is expensive. The utility model discloses a converter is used for turning into voltage signal with the capacitor signal that the capacitance detector produced, and the computing circuit is used for will according to the voltage and the relation of weight voltage signal calculates into the weight of tablet to show weight signal transmission to the display, the capacitance detector includes the circular metal plates of the equidistant coaxial setting of two at least vertical directions in edge, and the utmost point board ruler in the middle of being located is very little minimum, and is crescent to the both sides size, all serial numbers be odd for the polar plate wire connect, as a signal output part, all serial numbers are the wire for the polar plate of even number and connect, as another signal output part, be provided with the slope opposite direction of a set of silica gel column, adjacent two sets of silica gel columns between two adjacent polar plates. This tablet weighing device precision is high, small, is applicable to the tablet and weighs.
Description
Technical field
This utility model is related to weighing-appliance.
Background technology
In pharmacy, electronic balance is usually used carries out a point medicine bottling.Single patient in for family or hospital, or only
Only be the volunteer for participating in medical science test, it is not only inconvenient that everyone is equipped with an electronic balance, also uneconomical, and electronic balance without
Medication quantity writing function.Additionally, carry out tablet using existing other electronic weighing devices weigh, device exist low precision,
Volume is big, expensive defect.
Utility model content
Design of the present utility model aims to solve the problem that big and price the problem of existing weighing device low precision, volume.Now carry
For a kind of tablet weighing device based on capacitance detector.
Tablet weighing device based on capacitance detector described in the utility model includes capacitance detector, transducer, meter
Circuit and display are calculated, transducer is used to for the capacitance signal that capacitance detector is produced to be converted into voltage signal, and counting circuit is used
The voltage signal is calculated as into the weight of tablet in the relation according to voltage and weight, and weight signal is sent to display
Shown；
The capacitance detector is a capacitor with multiple electrode plates sensor, and the capacitance detector includes at least two circular gold
Category pole plate 1, all pole plates 1 are vertically equidistantly coaxially disposed successively, and numbering is followed successively by one to n, a pole plate 1 and n
Number pole plate 1 is equivalently-sized, and No. two pole plates 1 are equivalently-sized with n-1 pole plates 1, the size phase of No. three pole plates 1 and n-2 pole plates 1
Together, by that analogy；It is minimum positioned at the middle size of pole plate 1, gradually increase to the size of both sides pole plate 1 from centre；All numberings are
The pole plate 1 of odd number is connected using wire, and as a signal output part of the capacitance detector；All numberings are even number
Pole plate 1 be connected using wire, and as another signal output part of the capacitance detector；Per two adjacent pole plates
The individuality being provided between 1 in one group of silicagel column 2, and every group of silicagel column 2 is inclined and equidistantly be arranged in parallel, same group of silica gel
The individual incline direction of post 2 is identical, and the incline direction of two adjacent groups silicagel column 2 is contrary；The capacitor with multiple electrode plates sensor is used for
The difference of power on pole plate 1 is applied to according to tablet and the capacitance signal of change is produced.
Beneficial effect：
In the capacitance detector of above-mentioned tablet weighing device, the pole plate 1 positioned at top layer and the diameter phase of the pole plate positioned at bottom 1
Together, upper several second layer pole plates 1 are identical with the diameter of lower second pole plate 1 of number, the 3rd pole plate of upper several third layer pole plates 1 and lower number
1 diameter is identical ..., and the diameter with diameter greater than upper several second layer pole plates 1 of top layer pole plate 1, upper several second layer pole plates 1
The diameter ... with diameter greater than upper several third layer pole plates 1, i.e., from centre to both sides, the diameter of pole plate 1 be in incremental variations.Using
This size and structure are arranged, and when capacitance detector carries out weighing operation, tablet are placed on the pole plate 1 of top layer, are compiled
Number be not in relative horizontal displacement for the pole plate 1 of odd number.Additionally, the pole plate 1 that numbering is even number also will not surpass in the horizontal direction
Go out the maximum pole plate 1 of upper and lower area, its action will not be limited because contacting surrounding objects.In the capacitor with multiple electrode plates sensor,
Equivalent to spring, all individualities in every layer of silicagel column 2 form an angle and equidistantly parallel the function of silicagel column 2 with pole plate
Arrange, the inclination direction of silicagel column 2 of adjacent two layers is contrary.Therefore, when structure of the present utility model both ensure that and weigh medicine bottle without
Lateral displacement, turn avoid the shortcoming that uprighting spring easily causes rigidity mutation, be entered using the structure of the capacitance detector of the application
Row is weighed, and has the advantages that sensitivity height, detection accuracy are strong, with low cost.Two signal input parts of transducer connect respectively
Two signal output parts of capacitance detector are connect, the converted device of the capacitance signal that capacitance detector is produced is obtained and tablet after processing
The corresponding voltage signal of weight, and shown by display.Empirical tests, using the capacitance detector of five pole plates, averagely
Sensitivity can reach 23.06mV/g.
Based on the tablet weighing device of above-mentioned capacitance detector, using capacitance detector as core devices, with sensitivity
High, detection accuracy is strong, the advantage of small volume, and the preparation process of capacitance detector is quick and easy, with low cost, reduces
The cost of tablet weighing device.
Description of the drawings
Fig. 1 is the structural representation of capacitor with multiple electrode plates sensor in embodiment one；
Fig. 2 is the cross-sectional view of the Chinese medicine tablet weighing device of embodiment one, and 3 represent transducer in figure, for inciting somebody to action
The capacitance signal that capacitance detector is produced is converted into voltage signal；
Fig. 3 is the relation curve of initial distance between capacitance and pole plate in embodiment one；
Fig. 4 is the voltage-weight distribution curve of five kinds of capacitance detectors in embodiment two, wherein 4 is copper polar plate hairspring,
5 is quadripolar plate copper bulky spring, and 6 is copper polar plate bulky spring, and 7 represent that aluminum substrate carefully dredges spring, and 8 represent the thin short spring of copper polar plate；
Fig. 5 is the Sensitivity comparison figure of five pole plate copper electric capacity in embodiment two and quadripolar plate copper electric capacity, and 9 represent in figure
Five pole plate copper electric capacity, 10 represent quadripolar plate copper electric capacity；
Fig. 6 is the theory diagram of the Chinese medicine tablet weighing device of embodiment three；
Fig. 7 is the circuit diagram of the transducer in embodiment three；
Fig. 8 is the overlooking the structure diagram of the tablet weighing device weighed for single medicine bottle in embodiment three；
Fig. 9 is the overlooking the structure diagram of the tablet weighing device weighed for multiple medicine bottles in embodiment three；
Figure 10 is the theory diagram of the Chinese medicine tablet weighing device of embodiment four.
Specific embodiment
Specific embodiment one：Illustrate present embodiment referring to figs. 1 to Fig. 3, described in present embodiment based on electricity
Holding the tablet weighing device of detector includes capacitance detector, transducer and display, and transducer is used to produce capacitance detector
Raw capacitance signal is converted into voltage signal, and the voltage signal is sent to display is shown；
The capacitance detector is a capacitor with multiple electrode plates sensor, and the capacitance detector includes at least two circular gold
Category pole plate 1, all pole plates 1 are vertically equidistantly coaxially disposed successively, and numbering is followed successively by one to n, a pole plate 1 and n
Number pole plate 1 is equivalently-sized, and No. two pole plates 1 are equivalently-sized with n-1 pole plates 1, the size phase of No. three pole plates 1 and n-2 pole plates 1
Together, by that analogy；It is minimum positioned at the middle size of pole plate 1, gradually increase to the size of both sides pole plate 1 from centre；All numberings are
The pole plate 1 of odd number is connected using wire, and as a signal output part of the capacitance detector；All numberings are even number
Pole plate 1 be connected using wire, and as another signal output part of the capacitance detector；Per two adjacent pole plates
The individuality being provided between 1 in one group of silicagel column 2, and every group of silicagel column 2 is inclined and equidistantly be arranged in parallel, same group of silica gel
The individual incline direction of post 2 is identical, and the incline direction of two adjacent groups silicagel column 2 is contrary；The capacitor with multiple electrode plates sensor is used for
The difference of power on pole plate 1 is applied to according to tablet and the capacitance signal of change is produced.
The core devices of above-mentioned tablet weighing device are capacitance detectors, in design capacitance detector, are needed from following
Several respects consider.
1st, the selection of pole plate 1
The material of the pole plate 1 of capacitance sensor should have the characteristics such as lightweight, intensity is high, conductivity is high and cheap.
Various metals are compared, copper is preferred material.Compared with copper, aluminum is higher, heavy with intensity in addition to conductivity is slightly lower
The lighter advantage of amount, also can be used as a kind of selection.Because plate thickness does not affect capacitance, we must be as far as possible thin by plate designs, only
Want intensity to meet to require.In fact, the product in future with the lighter plastics of weight or glass it is even possible that make pole
Plate, only by plated with conductive material on its surface.
Additionally, in order to weaken impact of the facing area change to capacitance, as shown in figure 1, our structures to pole plate are carried out
Particular design so that the difference of adjacent plate radius isWhen capacitance sensor works, the horizontal moving ranges of any plate
All without beyond the edge of adjacent panels.This structure has two advantages, and one side electric capacity will not be affected too by facing area change
Many, on the other hand first and third, five pole plates are not in relative displacement.Additionally, second, quadripolar plate is also without departing from upper and lower maximum
The pole plate of area, its action will not be limited because contacting surrounding objects.
2nd, between pole plate spring selection
Elastic, repeatable, long-life that elastic column material between pole plate should have, small volume and cheap etc. excellent
Point.Because metal spring easily causes short circuit and is easily caused change in dielectric constant, thus do not select to use.
To avoid using vertical spring post between adjacent copper coin, easily cause the shortcoming of rigidity mutation, we adopt 45 degree of angles
Inclined post is used as the spring between pole plate.When realizing weighing operation using capacitor with multiple electrode plates sensor, meeting between adjacent plate
There is relative movement.Using two adjacent groups post spring setting in opposite direction as shown in Figure 1, interlayer spring direction identical
Arrangement architecture, when weighing device can be made to work, numbering be odd number pole plate 1 between without relative displacement.This structure both ensure that weighs
When medicine bottle without lateral displacement, turn avoid the shortcoming for easily causing rigidity mutation using vertical spring post.
3rd, quantity of polar plate is selected
The sensitive analysis of capacitance sensor：
Capacitance value C can be expressed as follows with geometric parameter and dielectric constant：
Herein the unit of capacitance C is farad (F).εrIt is the dielectric constant of material between pole plate, ε0It is permittivity of vacuum.A
It is the facing area of pole plate, unit is square metre.D is the distance between two-plate, and unit is rice.
The sensitivity of one sensor reflects variable quantity of the output valve with measurement parameter.Our spirits capacitance sensor
Sensitivity is defined asHere △ G are weight of weighing, and △ C are the respective change amounts of capacitance, and the unit of sensitivity S is F/
g。
For LOAD CELLS, in addition to polar plate spacing is apart from d, it is assumed that every other parameter constant.Capacitor's capacity table
Show as follows：
Here d0It is initial distance, △ d are the variable quantities for increasing distance change with load.So, the relative change of electric capacity
Measure and be：If (△ d/d0)<<1,Can with Taylor expansion into：
If omitting high-order term, formula (4) is obtained,
If △ G are the weight of a tablet, K is the coefficient of elasticity of material between pole plate, and △ d are distance between polar plate with being placed on pole
The change of a medicine on plate, then △ G=K △ d.So as to electric capacity may be defined as with the sensitivity that tablet fill weights change：
It is assumed that A and εrKeep constant, then sensitivity S and coefficient of elasticity K and initial distanceIt is inversely proportional to.
If only retaining the first order and quadratic term in Taylor expansion, formula (6) is obtained：
Thus, if equation (5) is for meter sensitivity, relative non-linear error efFor：
As shown in Fig. 3 (a), when K keeps constant,Less, electric capacity is more sensitive.By Fig. 3 (b) as can be seen that only working as △
d/d0When less, △ d/d0With △ C/C0Between just there is approximate linear relationship, this is beneficial to weigh.So as to mean bullet
Property coefficient K should not be designed to too little.
From above discussion, pole plate initial separation d0Less, electric capacity is more sensitive.But, if apart from too small, causing
Range diminishes, while being easily short-circuited.Therefore, on the one hand, in order to increase sensitivity, pole plate initial distance should be designed to try one's best
Little, on the other hand, polar plate spacing will meet the range request that weighs.
From above discussion, coefficient of elasticity K is inversely proportional to sensitivity S, so as to reducing coefficient of elasticity K can increase survey
Amount sensitivity S, but while can also cause range to reduce, in addition, can also cause between △ C and △ d obviously nonlinear dependence
System.Therefore appropriate coefficient of elasticity should be selected.
To solve the contradiction between sensitivity and measurement range, and the linear relationship for having kept as far as possible, we select to make
Use capacitor with multiple electrode plates sensor.Capacitor with multiple electrode plates computing formula is：
Here n is pole plate number.So as to not change elastomeric material elasticity system between initial distance, pole plate facing area and pole plate
In the case of number, the capacitance of capacitor with multiple electrode plates is (n-1) times of two-plate capacitor's capacity.Therefore, the sensitivity of capacitor with multiple electrode plates
Also it is changed into (n-1) times of two-plate capacitance sensitivity.
Specific embodiment two：With reference to Fig. 4 and Fig. 5 explanation present embodiments, present embodiment is to the institute of embodiment one
That what is stated is described further based on the tablet weighing device of capacitance detector, and in present embodiment, described capacitance detector is
Five plates capacitance sensors.Five plates capacitance sensor pole plates are numbered be followed successively by 1,2,3,4 and 5 from top to bottom, wherein, 1 and 5
It is equivalently-sized, it is2 and 4 is equivalently-sized, isThe size of No. 3 pole plates
ForIf its size relationship is as shown in figure 1, plate spacing is h, adjacent plate semidiameter is
It is to reduce the impact for changing and causing to capacitance because of pole plate facing area during working sensor using the size assortment.
Compare through testing repeatedly, the measurement that selecting five kinds of typical capacitance sensors carries out tablet quantity is compared.Table 1 is arranged
The parameter and measurement sensitivity of five kinds of capacitance sensors are gone out.As shown in figure 4, wherein curve 5 be quadripolar plate electric capacity, other curves
It is two plates capacitances.Relation curve during five kinds of capacitance measurements between tablet quantity and output voltage is different, during measurement
Maximum tablet quantity is 100, every tablet weight 1.35g, output voltage signal excursion -2.5-2.5V, Wo Menyong
Its scope is adjusted to 0-5V by MATLAB.It can be seen that the slope of the thin short spring capacitance detector of copper coin is minimum, copper polar plate
Bulky spring capacitance detector slope is slightly larger, the maximum slope of copper polar plate hairspring capacitance detector, but the curve reaches rapidly survey
The upper limit of amount voltage range.Preferably, not only slope is larger, and its end is or not the curve of quadripolar plate copper bulky spring capacitance detector
The upper limit of measurement voltage range can be exceeded.Because spring is meticulous very few, the effect that aluminum substrate carefully dredges spring capacitance detector is worst.
Mapping relations one by one between tablet quantity and output voltage are complicated.For a specific capacitor, with medicine
There is respective change, Jie of material between the change size of capacitance and coefficient of elasticity K, pole plate in piece number change, capacitor plate spacing
Electric constant εrIt is all related to facing area A of pole plate.Additionally, being also complicated by the process that capacitance signal is converted into voltage signal
's.Therefore, exist without absolute linear relationship between tablet quantity and output voltage, this is also just explained in Fig. 4 and Fig. 5
Curve shape.However, good one-to-one relationship and big slope are beneficial to weigh.
From Fig. 4 it can further be seen that sensitivity S ' changes with tablet number change.In table 1, we represent flat with S '
Sensitivity.Can see, most sensitive in table 1 is quadripolar plate capacitance sensor.Its average sensitivity 19.63mV/g.From Fig. 4
With Fig. 5 it will be seen that whole voltage change range should make full use of to measure tablet quantity.Swertia Tablet quality determines
When, we can increase the excursion of capacitance values by the quantity or size of PDMS springs between reduction pole plate.
The average sensitivity of the different capacitance sensors of table 1
From Fig. 4 it will also be appreciated that, the sensitivity of the harder capacitance sensor of spring is poorer, and the slope of curve is less, to the greatest extent
Now range is larger for pipe.Conversely, spring is softer, capacitance sensor is more sensitive, and the slope of curve is bigger.Therefore, aluminum substrate carefully dredges bullet
Spring capacitance curve is worst, and copper polar plate bulky spring electric capacity is preferably, and quadripolar plate copper bulky spring capacitance curve is best.
For capacitance sensor, short pole plate initial separation, thin and few spring, big polar plate area and big plate
Between material dielectric constant will increase sensitivity.And for subsequent conditioning circuit, big amplification will make output signal to tablet
Number change is more sensitive.However, more sensitive electric capacity more easily reaches measuring limit, and circuit amplification is bigger, output electricity
Pressure more easily reaches the upper limit.
Therefore, should be compromised between sensitivity and wide range.A kind of perfect condition is, electric capacity meet range will
When asking, its capacitance excursion is consistent with the output voltage range of circuit, i.e., reach maximum and minima simultaneously.
Fig. 5 show the voltage-weight distribution curve figure of five pole plate copper electric capacity and quadripolar plate copper electric capacity, it can be seen that sensitive
Degree aspect, five plates capacitance outlines are better than quadripolar plate electric capacity.Using five pole plate copper capacitance sensors, repeat one group of experiment.Table 2 is
Voltage during five pole plate copper capacitance measurement tablets and dose relation, tablet quantitative range is 1-100, and voltage change range is
57mV-3170mV.Measured using five pole plate copper capacitance sensors, its average sensitivity reaches 23.06mV/g.
The corresponding relation of the voltage of table 2 and tablet quantity
Specific embodiment three：Present embodiment is illustrated with reference to Fig. 6 to Fig. 9, present embodiment is to the He of embodiment one
The further restriction of the tablet weighing device based on capacitance detector described in two, in present embodiment, the transducer includes
± 2.5V power supplys, transformator T, reference capacitance C0, resistance R1, resistance R2, resistance R3, resistance R4, slide rheostat Rf1, slide become
Resistance device Rf2, slide rheostat Rf3, operational amplifier v0, operational amplifier v1, operational amplifier v2, operational amplifier v3, diode
D1, diode D2, diode D3, diode D4, electric capacity of voltage regulation C1With electric capacity of voltage regulation C2, ± 2.5V power supplys connect capacitance detecting simultaneously
Device CxAn outfan and reference capacitance C0One end, capacitance detector CxAnother outfan connect resistance R simultaneously1's
One end and operational amplifier v0Inverting input connection, operational amplifier v0Normal phase input end connection power supply ground, operation amplifier
Device v0Outfan connect resistance R simultaneously1The other end and resistance R3One end, resistance R3The other end connect to slide simultaneously and become
Resistance device Rf1One end and operational amplifier v2Normal phase input end, operational amplifier v2Outfan simultaneously connection transformer T
One end of primary coil, slide rheostat Rf2One end and slide rheostat Rf2Sliding end, the primary coil of transformator T
Other end connection power supply ground, slide rheostat Rf2The other end simultaneously concatenation operation amplifier v2Inverting input and resistance R4
One end, resistance R4The other end connect resistance R simultaneously2One end and operational amplifier v1Outfan, operational amplifier v1's
Positive input connection power supply ground, operational amplifier v1Reverse input end connect resistance R simultaneously2The other end and reference capacitance
C0The other end, operational amplifier v3Outfan as voltage signal output end.
As shown in fig. 6, the capacitance signal of change to be converted into the voltage signal of change, then, output using transducer
Voltage signal is sent to display, while can also be sent on mobile phone or computer terminal by bluetooth.
In present embodiment, the capacitance of capacitance sensor only has several pico farads, and with the electricity caused by tablet number change
Holding change can be less, and easily receives environmental disturbances.Additionally, a very little change is difficult measuring by common LCR tables
Arrive, and highly sensitive instrument is only used for laboratory.So as to we can only be with highly sensitive interface circuit as an alternative.
As shown in figure 5, the capacitance variations for signifying medicine bottle Chinese medicine tablet quantity for detection, we devise one based on adjustable reference electric capacity
Interface circuit, here, CxAnd C0Measured capacitance (i.e. the capacitance of capacitance detector output) and reference capacitance are represented respectively.Use
Input signal V that voltage change range is ± 2.5V, frequency is 100kHzin.Capacitance is converted into letter by the differentiator of front end two
Number amplitude, further extracts and amplifies the difference of two signals using a difference amplifier.When in medicine bottle without tablet, C0Can make
For the initial value of capacitance sensor, thus V when in medicine bottle without medicineout1Equal to 0.In order to measure conveniently, common bridge-type is generally used
Commutator is by AC signal Vout1It is converted into direct current.
Tablet weighing device can only include a capacitance detector (as shown in Figure 8), for measuring single medicine bottle, also may be used
With comprising multiple capacitance detectors (as shown in Figure 9), for measuring multiple medicine bottles.When comprising multiple capacitance detectors, each
Capacitance detector is equipped with a transducer.
Tablet weighing device described in present embodiment using capacitance detector as core devices, with sensitivity it is high,
Detection accuracy is strong, it is with low cost the advantages of.
Specific embodiment four：Present embodiment is illustrated with reference to Figure 10, present embodiment is to the institute of embodiment one to three
The further restriction of the tablet weighing device based on capacitance detector stated, in present embodiment, the tablet weighing device is also wrapped
Counting circuit is included, the counting circuit is used to that the voltage signal to be calculated as the weight of tablet according to the relation of voltage and weight
Amount, and weight signal is sent to display shown.
Present embodiment increased counting circuit, and the function of counting circuit is the pressure according to capacitance detector and transducer
Power-voltage curve, by the voltage signal that transducer is exported weight signal (i.e. pressure signal) is converted into, can according to Fig. 4 and Fig. 5
Know, if using quadripolar plate or five plates capacitance detectors, pressure-voltage curve can split into two sections or more multistage straight line,
What the slope and intercept of so every section straight line was all to determine, therefore, for the voltage signal that each determines, it can be calculated
Corresponding tablet fill weights.Counting circuit can be using several schemes under several：
(1) realized using multiplier and adder, an input of multiplier is used to be input into slope, another input
For input voltage signal, outfan connects an input of adder, and another input of adder is used for input and cuts
Away from the outfan output weight signal of adder；
(2) using single-chip microcomputer or other can realize the chip of computing function, the software program that it is internally embedded is using existing
There is technology (simply simple addition and multiplication function) can be realized as.
Claims (5)
1. the tablet weighing device of capacitance detector is based on, it is characterised in that including capacitance detector, transducer and display,
Transducer is used to for the capacitance signal that capacitance detector is produced to be converted into voltage signal, and the voltage signal is sent to display
Shown；
The capacitance detector is a capacitor with multiple electrode plates sensor, and the capacitance detector includes at least two circular metal poles
Plate (1), all pole plates (1) are vertically equidistantly coaxially disposed successively, and numbering is followed successively by one to n, a pole plate (1) with
N pole plates (1) are equivalently-sized, and No. two pole plates (1) are equivalently-sized with n-1 pole plates (1), No. three pole plates (1) and n-2 pole plates
(1) equivalently-sized, by that analogy；It is minimum positioned at middle pole plate (1) size, from centre to both sides pole plate (1) size gradually
Increase；
All numberings are that the pole plate (1) of odd number is connected using wire, and as a signal output of the capacitance detector
End；All numberings are that the pole plate (1) of even number is connected using wire, and as another signal output of the capacitance detector
End；
The individuality being provided with one group of silicagel column (2), and every group of silicagel column (2) between per two adjacent pole plates (1) is inclined
And equidistantly be arranged in parallel, the individual incline direction of same group of silicagel column (2) is identical, the inclination side of two adjacent groups silicagel column (2)
To contrary；
The capacitor with multiple electrode plates sensor is used to be applied to the difference of power on pole plate (1) and produce the electric capacity letter of change according to tablet
Number.
2. tablet weighing device according to claim 1, it is characterised in that the transducer includes ± 2.5V power supplys, becomes
Depressor T, reference capacitance C0, resistance R1, resistance R2, resistance R3, resistance R4, slide rheostat Rf1, slide rheostat Rf2, slide become
Resistance device Rf3, operational amplifier v0, operational amplifier v1, operational amplifier v2, operational amplifier v3, diode D1, diode D2, two
Pole pipe D3, diode D4, electric capacity of voltage regulation C1With electric capacity of voltage regulation C2, ± 2.5V power supplys are while connect capacitance detector CxOne output
End and reference capacitance C0One end, capacitance detector CxAnother outfan connect resistance R simultaneously1One end and operation amplifier
Device v0Inverting input connection, operational amplifier v0Normal phase input end connection power supply ground, operational amplifier v0Outfan it is same
When connect resistance R1The other end and resistance R3One end, resistance R3The other end connect slide rheostat R simultaneouslyf1One end and
Operational amplifier v2Normal phase input end, operational amplifier v2Outfan simultaneously one end of the primary coil of connection transformer T,
Slide rheostat Rf2One end and slide rheostat Rf2Sliding end, the primary coil of transformator T the other end connection power supply
Ground, slide rheostat Rf2The other end simultaneously concatenation operation amplifier v2Inverting input and resistance R4One end, resistance R4's
The other end connects resistance R simultaneously2One end and operational amplifier v1Outfan, operational amplifier v1Positive input connection
Power supply ground, operational amplifier v1Reverse input end connect resistance R simultaneously2The other end and reference capacitance C0The other end, computing
Amplifier v3Outfan as voltage signal output end.
3. tablet weighing device according to claim 1 and 2, it is characterised in that also including counting circuit, the calculating electricity
Road is used to that the voltage signal to be calculated as the weight of tablet according to the relation of voltage and weight, and weight signal is sent to aobvious
Show that device is shown.
4. tablet weighing device according to claim 1 and 2, it is characterised in that the inclination angle of two adjacent groups silicagel column (2)
Degree is 45 degree.
5. tablet weighing device according to claim 1 and 2, it is characterised in that pole plate (1) quantity is five.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621208062.2U CN206132191U (en) | 2016-11-09 | 2016-11-09 | Tablet weighing device based on capacitance detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621208062.2U CN206132191U (en) | 2016-11-09 | 2016-11-09 | Tablet weighing device based on capacitance detector |
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| Publication Number | Publication Date |
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| CN206132191U true CN206132191U (en) | 2017-04-26 |
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|---|---|---|---|
| CN201621208062.2U Expired - Fee Related CN206132191U (en) | 2016-11-09 | 2016-11-09 | Tablet weighing device based on capacitance detector |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107242644A (en) * | 2017-06-19 | 2017-10-13 | 深圳市沃特沃德股份有限公司 | Shoe-pad and shoes |
| CN108311414A (en) * | 2018-01-10 | 2018-07-24 | 陈德言 | A kind of tablet press machine tablet automatic detection device |
| CN108405351A (en) * | 2018-01-10 | 2018-08-17 | 陈德言 | A kind of tablet automatic detection device |
| CN109655141A (en) * | 2018-12-29 | 2019-04-19 | 出门问问信息科技有限公司 | The weighing method and device of a kind of electronic equipment |
| CN114655577A (en) * | 2022-03-11 | 2022-06-24 | 杭州瑞禾源科技有限公司 | Portable intelligent drug management equipment and management system |
-
2016
- 2016-11-09 CN CN201621208062.2U patent/CN206132191U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107242644A (en) * | 2017-06-19 | 2017-10-13 | 深圳市沃特沃德股份有限公司 | Shoe-pad and shoes |
| CN108311414A (en) * | 2018-01-10 | 2018-07-24 | 陈德言 | A kind of tablet press machine tablet automatic detection device |
| CN108405351A (en) * | 2018-01-10 | 2018-08-17 | 陈德言 | A kind of tablet automatic detection device |
| CN109655141A (en) * | 2018-12-29 | 2019-04-19 | 出门问问信息科技有限公司 | The weighing method and device of a kind of electronic equipment |
| CN114655577A (en) * | 2022-03-11 | 2022-06-24 | 杭州瑞禾源科技有限公司 | Portable intelligent drug management equipment and management system |
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