CN102155965A - Method for measuring weight of powder filled in capsule through comparison - Google Patents
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- CN102155965A CN102155965A CN2010105854823A CN201010585482A CN102155965A CN 102155965 A CN102155965 A CN 102155965A CN 2010105854823 A CN2010105854823 A CN 2010105854823A CN 201010585482 A CN201010585482 A CN 201010585482A CN 102155965 A CN102155965 A CN 102155965A
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Abstract
The invention relates to a method for measuring the weigh of powder filled in a capsule through comparison. In the method, the difference between the weight of powder filled in a capsule and the weight of powder filled in a standard capsule is measured by comparing the capsule with a standard capsule, wherein the comparing process comprises the following steps: putting the capsule to be measured and the standard capsule into a container, charging high-pressure (N atmospheric pressure) gas in the container, quickly discharging the high-pressure gas in the container to make the container in the normal-pressure state after the high-pressure gas penetrates into the capsule to be measured and the standard capsule, measuring the length of the expanded capsule to be measured and the expanded standard capsule after the capsule to be measured and the standard capsule expand under the action of internal and external pressure difference, and measuring the difference between the weight of the powder filled in the capsule to be measured and the weight of the powder filled in the standard capsule according to a formula. The method can realize the capsule weight sorting just by measuring capsule length and the change of the capsule length, is simple and efficient, is easy to implement, has low requirement on equipment for implementing the method and is easy to popularize.
Description
Technical field
The present invention relates to a kind of method of measuring the weight of the medicinal powder that loads in the capsule.
Background technology
In the pharmaceuticals industry field, because influence of various factors such as the stability of capsule filling apparatus self and medicinal powder self-characteristic, make in the production run of capsule that the weight of institute's powder charge powder is that the capsule grain heavily exists fluctuation in it, and for the medicine of treatment disease, the amount of contained drug in the unit dose, be heavy just must being stabilized in the narrower scope of grain of every capsules, so pharmacy corporation can heavily carry out strict management and control and measurement to the grain of capsule, detects and reject the heavy undesirable defect ware of grain.
At present the method that capsule is carried out a remeasurement mainly is to utilize various mechanical balances, electronic balance or utilize the various weighing-appliances of weight sensor principle to carry out direct weighing measurement, but all there is this many drawback in these modes.The weighing process of various mechanical balances, electronic balance all needs to operate manually, and drawback is: detection speed is slow, inefficiency, complex operation; Can't realize on-line automatic weighing, can only be used for sampling observation, can't realize that capsule pursue grain weighs, this method still has a lot of the undesirable capsules of weight to be detected to the monitoring dynamics of capsule grain weight and limited.Though and the various equipment work efficiency of weight sensor principle of utilizing significantly improves, can realize capsule is weighed by grain, its remarkable drawback is also arranged: equipment precision, cost are very expensive, are unfavorable for promoting at pharmacy corporation; System complex, maintenance difficulties is big, the maintenance cost height.
Summary of the invention
The purpose of this invention is to provide a kind of contrast formula assay method, it can efficiently, automatically measure capsule filling medicinal powder weight, and realizes that cost can be very low.
To achieve these goals, first aspect present invention provides a kind of comparative determination method of capsule filling medicinal powder weight, may further comprise the steps:
(a) with one known in the normal capsules of powder charge grain weight amount and capsule length be with reference to capsule, with the length adjustment of capsule to be measured to the equal in length of reference capsule;
(b) put into a container with capsule to be measured with reference to capsule, seal this container and in this container, charge into N atmospheric gases at high pressure, make gases at high pressure infiltrate capsule to be measured in the capsule cap of capsule and the slit between the utricule and with reference to the inside of capsule;
(c) quick gases at high pressure in the amount discharge container make and recover atmospheric pressure state in the container, capsule to be measured and expand under the inside and outside differential pressure effect respectively with reference to capsule;
(d) measure respectively the length h1 of the capsule to be measured after the expansion and expand after the length h2 with reference to capsule, calculate the difference of the shared volume of filling medicinal powder and the ratio of capsule cross-sectional area in capsule to be measured and the reference capsule according to formula (h1-h2)/N.After gases at high pressure in container were discharged rapidly, the known gases at high pressure of N value made capsule be expanded to interior external pressure once more till the balance, and the degrees of expansion according to capsule can compare calculating with capsule to be measured with reference to capsule at an easy rate then.
Further, can also calculate powder charge grain weight amount in the capsule to be measured according to function m 2-m1=ρ * S* (h1-h2)/N, wherein m1 represents the weight of powder charge powder in the capsule to be measured, the weight that the m2 representative is known with reference to powder charge powder in the capsule, ρ represents the density of powder charge powder in the capsule to be measured, and S represents the cross-sectional area of capsule to be measured.Calculate capsule to be measured poor with reference to the weight of powder charge powder in the capsule, thereby can calculate the weight of filling medicinal powder in the capsule to be measured.
Second aspect present invention provides a kind of comparative determination method of capsule filling medicinal powder weight, and it may further comprise the steps:
(a) choose normal capsules that length equates with it for reference to capsule according to the specification of capsule to be measured, the length of normal capsules and Qi Nei powder charge grain weight amount are known;
(b) put into a container with capsule to be measured with reference to capsule, seal this container and in this container, charge into N atmospheric gases at high pressure, make gases at high pressure infiltrate capsule to be measured and with reference to the inside of capsule;
(c) quick gases at high pressure in the amount discharge container make and recover atmospheric pressure state in the container, capsule to be measured and expand under the inside and outside differential pressure effect respectively with reference to capsule;
(d) measure respectively the length h1 of the capsule to be measured after the expansion and expand after the length h2 with reference to capsule, calculate the difference of the shared volume of filling medicinal powder and the ratio of capsule cross-sectional area in capsule to be measured and the reference capsule according to formula (h1-h2)/N.
What the technical program was different with first technical scheme is: can carry out according to the specification of capsule to be measured when choosing with reference to capsule, and not remake length, do not handle by capsule to be measured, equally, also be to calculate the poor of capsule to be measured and normal capsules filling medicinal powder weight, thereby draw the weight of filling medicinal powder in the capsule to be measured according to the degrees of expansion of capsule.
Third aspect present invention provides a kind of comparative determination method of capsule filling medicinal powder weight, and it may further comprise the steps:
(a) with one known in the normal capsules of powder charge grain weight amount and capsule length be with reference to capsule, measure the length of capsule to be measured, and according to Δ=capsule length to be measured-go out difference DELTA with reference to the capsule length computation;
(b) put into a container with capsule to be measured with reference to capsule, seal this container and in this container, charge into N atmospheric gases at high pressure, make gases at high pressure infiltrate capsule to be measured and with reference to the inside of capsule;
(c) quick gases at high pressure in the amount discharge container make and recover atmospheric pressure state in the container, capsule to be measured and expand under the inside and outside differential pressure effect respectively with reference to capsule;
(d) measure respectively the length h1 of the capsule to be measured after the expansion and expand after the length h2 with reference to capsule, calculate the difference of the shared volume of filling medicinal powder and the ratio of capsule cross-sectional area in capsule to be measured and the reference capsule according to formula (h1-h2-Δ)/(N-1)-Δ.
Before capsule to be measured and normal capsules are made expansion process, measure the length difference between the two capsules earlier, equally also can measure the weight of filling medicinal powder in the capsule to be measured according to the degrees of expansion of capsule.
Advantage of the present invention is: by the gases at high pressure of importing default air pressure two kinds of capsules are expanded, and utilize formula to calculate weight poor of powder charge powder in capsule to be measured and the normal capsules according to the degrees of expansion of capsule, can realize only by measuring capsule length and changing capsule being carried out heavily sorting of grain, this method is simple and feasible.Compare with the weight sensor class screening installation of weighing, this method is all very low to the requirement of the collection of the measure of precision of equipment, signal and aspects such as intractability and anti-interference, the equipment cost that is used to carry out this method also can be lower, and be convenient to safeguard, is beneficial at pharmacy corporation and promotes the use of.In addition, this method can realize the very high efficiency of separation, also can realize the capsule grain is heavily carried out online by the grain sorting.
Embodiment
The present invention measures medicinal powder weight in the capsule to be measured by the weight differential that contrasts powder charge powder in capsule to be measured and the normal capsules, main thought is: the difference that the medicinal powder volume difference of capsule is converted to its inner directly related with medicinal powder volume volume of air, and amplify the difference of volume of air doubly same by the method that feeding gases at high pressure in capsule expand capsule, then according to the difference in length of the capsule after expanding, and in conjunction with utilizing fixing funtcional relationship formula to come by judging the loading amount of capsule traditional Chinese medicine powder to be measured with the normal capsules mode of comparing.Below in conjunction with several embodiment content of the present invention is described in detail.
Embodiment one:
According to the specification of the standard reference capsule of ready known grain heavy (filling medicinal powder weight in the capsule), the capsule to be measured of same model waited to hold handle, also promptly: arrive the length adjustment of capsule to be measured identical with the standard reference capsule.Capsule is after can under the normal pressure situation, its inside is except medicinal powder, there is a part of atmospheric air (1 atmospheric pressure) in meeting more or less, because the capsule diameter of same model is identical, sectional area is identical, spherical crown partial shape, the volume of utricule capsule cap end are also identical, so for the same model capsule of pressing equal in length, its total measurement (volume) is identical, that is to say, the shared inner space volume of medicinal powder equates with the summation of volume of air; For simplicity, below when calculating, do not consider the volume of the spherical crown part of utricule capsule cap end, only consider that the volume of air of barrel portion can.Because sectional area is identical, the capsule gas volume is directly proportional with the length of gas column.Then normal capsules and capsule to be measured are put into closed container, in container, charge into N atmospheric pressure gas, make gases at high pressure infiltrate capsule along the slit between utricule capsule cap, the pressure of the original atmospheric air post of capsule will rise gradually so, after treating the capsule inside and outside air pressure balance, air pressure in the container that gases at high pressure in the rapid amount discharge container make becomes 1 atmospheric pressure rapidly, so meanwhile, the high pressure gas of capsule is known from experience the inner and outer air pressure difference rapid expanding that forms because of suddenly, the utricule capsule cap of pressing is strutted to two ends, capsule pressing length is increased.Measure the length h2 after length h1 after capsule to be measured expands and normal capsules expand, because the volume of medicinal powder can not change, so to be measured capsule and the length of gas column in normal capsules poor of the difference of h1 and h2 after expanding just.According to Boyle's law as can be known: the quantitative gas in closed container, under constant temperature, the pressure of gas and the volume relation of being inversely proportional to.Therefore, the gas column length of the capsule after expanding in theory should be N times before expanding, hence one can see that, gas column length difference before expanding in capsule to be measured and the normal capsules should be (h1-h2)/N, conversely, the normal capsules before expanding and the volume differences of the medicinal powder in the capsule to be measured also are S* (h1-h2)/N, further, can draw following formula 1:
M2-m1=ρ * S* (h1-h2)/N formula 1
In the formula, m2 represents the weight of filling medicinal powder in the normal capsules, and m1 represents the weight of filling medicinal powder in the capsule to be measured, and ρ represents the density of medicinal powder, and S represents the sectional area of capsule.ρ and S and m2 can directly be known according to the model of capsule, in fact, as long as develop the value that just can calculate m1 according to formula 1, load the weight of medicinal powder in the capsule just to be measured.
It should be noted in the mode that capsule is expanded, reduce leaking of capsule gas as far as possible, perhaps keep not leaking as far as possible, this target can realize by quick opening container or necessary seal approach.
Certainly, this embodiment also can slightly once change, such as: according to the specification of capsule to be measured the normal capsules of same model is waited to hold and handles, that is: with the length adjustment of normal capsules to equating with capsule to be measured.This mode is the another kind application that present embodiment does not change flesh and blood, does not repeat them here.
Embodiment two:
Choose same model normal capsules that length equates with it as the reference capsule according to the specification of capsule to be measured, capsule to be measured and normal capsules are put into closed container and charged into N atmospheric pressure gas, follow-up step and embodiment one are identical.The ratio N of same length difference, compression pressure and normal pressure according to the capsule after expanding, the density of medicinal powder, the sectional area of capsule inner chamber, and the grain that the grain of normal capsules heavily calculates capsule to be measured weighs.
The difference of this embodiment and embodiment one is the first step, no longer is the arbitrary standards capsule when choosing with reference to capsule, but the length of capsule to be measured is chosen requirement as one, so just need not appearances such as capsule work to be measured to be handled again.
Embodiment three:
Choose the heavy normal capsules of known grain, measure its length h2 ', and measure the length h1 ' of capsule to be measured, the difference DELTA of h1 ' and h2 ' is noted, then capsule to be measured and normal capsules are put into a container, seal this container and in this container, charge into N atmospheric gases at high pressure, consistent among follow-up step and embodiment one and the embodiment two, measure the length h2 after length h1 after capsule to be measured expands and normal capsules expand at last, come the difference of filling medicinal powder weight in basis of calculation capsule and the capsule to be measured according to following formula 2.
M2-m1=ρ * S*[(h1-h2-Δ)/(N-1)-and Δ] formula 2
In the formula, m2 represents the weight of filling medicinal powder in the normal capsules, and m1 represents the weight of filling medicinal powder in the capsule to be measured, and ρ represents the density of medicinal powder, and S represents the sectional area of capsule.
The reckoning process of formula 2 is set forth in detail hereinafter.
In fact, Δ comprises the length difference of capsule to be measured and normal capsules inner air post and length difference two parts of medicinal powder post, and expand finish after the length difference h1-h2 of capsule to be measured and normal capsules also comprised the length difference of air column and length difference two parts of medicinal powder post, and because the volume of medicinal powder is constant before and after capsule expands, therefore the length difference of the two capsules after two expansions with expand before the difference h1-h2-Δ of length difference of two capsules should be the poor of the interior air column length variations value of capsule to be measured and normal capsules.Equally, according to Boyle's law as can be known, the N before the air column length after the expansion should be and expands doubly, hence one can see that following formula 3.
The h1-h2-Δ=(N-1) (H1 '-H2 ') formula 3
In the formula, the length of the gas column in the capsule to be measured before H1 ' representative is expanded, the length of the gas column in the normal capsules before H2 ' representative is expanded.
Develop the formula 4 that can draw preceding capsule to be measured of calculating expansion and normal capsules length difference from formula 3, that is:
H1 '-H2 '=(h1-h2-Δ)/(N-1) formula 4
According to the result of formula 4 and in conjunction with the overall length difference Δ of capsule to be measured before expanding and normal capsules as can be known: the difference of the volume of capsule to be measured and normal capsules traditional Chinese medicine powder should be the S*[(h1-h2-Δ)/(N-1)-Δ], thereby just can release formula 2, and utilize formula 2 to calculate the value of the weight m1 of capsule filling medicinal powder to be measured.
In the practical application, the disclosed method of the present invention is mainly used in carries out the monitoring of fluctuation range to filling medicinal powder weight in the capsule, and capsule is being carried out grain heavily during sorting, all are the heavy standard values of known grain, the grain that is normal capsules mentioned above is heavy, and configured the heavy permission fluctuation range of capsule grain in advance, grain focuses on the certified products that are in the allowed band, and grain focuses on the defect ware that is outside the allowed band.In other words, promptly be: the length difference after expanding with normal capsules in capsule expansion to be measured back also should fluctuate within the specific limits, when the difference of the length after length that capsule to be measured expands and the normal capsules expansion exceeds this allowed band, the heavy heavy permission fluctuation range of grain that also just exceeded of the grain of this capsule to be measured is unacceptable product; When the difference of the length after length that capsule to be measured expands expands with normal capsules was in this allowed band, the grain of this capsule to be measured is heavy also just to be in the permission fluctuation range that grain weighs, and is certified products.When practical application, need not to calculate the value of the weight m1 of filling medicinal powder in the capsule to be measured thus usually, only need be by the length before and after capsule to be measured and the normal capsules expansion is measured respectively, situation of change by capsule length before and after expanding, whether the grain that can judge capsule to be measured fast heavily is in the acceptability limit, the capsule that length variations is exceeded allowed band is rejected, thereby realizes the heavily sorting of grain of capsule.
More than specific embodiment of the present invention is illustrated in conjunction with diagram; but protection content of the present invention is not only limited to above embodiment, in affiliated technical field of the present invention, and the common knowledge of a GPRS; just can in its technology main idea scope, carry out diversified change.
Claims (6)
1. the comparative determination method of capsule filling medicinal powder weight is characterized in that may further comprise the steps:
(a). with one known in the normal capsules of powder charge grain weight amount and capsule length be with reference to capsule, with the length adjustment of capsule to be measured to the equal in length of reference capsule;
(b). put into a container with capsule to be measured with reference to capsule, seal this container and in this container, charge into N atmospheric gases at high pressure, make gases at high pressure infiltrate capsule to be measured and with reference to the inside of capsule;
(c). quick gases at high pressure in the amount discharge container make and recover atmospheric pressure state in the container, capsule to be measured and expand under the inside and outside differential pressure effect respectively with reference to capsule;
(d). measure the length h1 of the capsule to be measured after the expansion respectively and expand after the length h2 with reference to capsule, calculate the difference of the shared volume of filling medicinal powder and the ratio of capsule cross-sectional area in capsule to be measured and the reference capsule according to formula (h1-h2)/N.
2. method according to claim 1, it is characterized in that: afterwards in step (d), calculate powder charge grain weight amount in the capsule to be measured according to function m 2-m1=ρ * S* (h1-h2)/N, wherein m1 represents the weight of powder charge powder in the capsule to be measured, the weight that the m2 representative is known with reference to powder charge powder in the capsule, ρ represents the density of powder charge powder in the capsule to be measured, and S represents the cross-sectional area of capsule to be measured.
3. the comparative determination method of capsule filling medicinal powder weight is characterized in that may further comprise the steps:
(a). choose normal capsules that length equates with it for reference to capsule according to the specification of capsule to be measured, the length of normal capsules and Qi Nei powder charge grain weight amount are known;
(b). put into a container with capsule to be measured with reference to capsule, seal this container and in this container, charge into N atmospheric gases at high pressure, make gases at high pressure infiltrate capsule to be measured and with reference to the inside of capsule;
(c). quick gases at high pressure in the amount discharge container make and recover atmospheric pressure state in the container, capsule to be measured and expand under the inside and outside differential pressure effect respectively with reference to capsule;
(d). measure the length h1 of the capsule to be measured after the expansion respectively and expand after the length h2 with reference to capsule, calculate the difference of the shared volume of filling medicinal powder and the ratio of capsule cross-sectional area in capsule to be measured and the reference capsule according to formula (h1-h2)/N.
4. method according to claim 3, it is characterized in that: afterwards in step (d), calculate powder charge grain weight amount in the capsule to be measured according to function m 2-m1=ρ * S* (h1-h2)/N, wherein m1 represents the weight of powder charge powder in the capsule to be measured, the weight that the m2 representative is known with reference to powder charge powder in the capsule, ρ represents the density of powder charge powder in the capsule to be measured, and S represents the cross-sectional area of capsule to be measured.
5. the comparative determination method of capsule filling medicinal powder weight is characterized in that may further comprise the steps:
(a). with one known in the normal capsules of powder charge grain weight amount and capsule length be with reference to capsule, measure the length of capsule to be measured, and according to Δ=capsule length to be measured-go out difference DELTA with reference to the capsule length computation;
(b). put into a container with capsule to be measured with reference to capsule, seal this container and in this container, charge into N atmospheric gases at high pressure, make gases at high pressure infiltrate capsule to be measured and with reference to the inside of capsule;
(c). quick gases at high pressure in the amount discharge container make and recover atmospheric pressure state in the container, capsule to be measured and expand under the inside and outside differential pressure effect respectively with reference to capsule;
(d). measure the length h1 of the capsule to be measured after the expansion respectively and expand after the length h2 with reference to capsule, calculate the difference of the shared volume of filling medicinal powder and the ratio of capsule cross-sectional area in capsule to be measured and the reference capsule according to formula (h1-h2-Δ)/(N-1)-Δ.
6. method according to claim 5, it is characterized in that: afterwards in step (d), according to function m 2-m1=ρ * S*[(h1-h2-Δ)/(N-1)-and Δ] calculate powder charge grain weight amount in the capsule to be measured, wherein m1 represents the weight of powder charge powder in the capsule to be measured, the weight that the m2 representative is known with reference to powder charge powder in the capsule, ρ represents the density of powder charge powder in the capsule to be measured, and S represents the cross-sectional area of capsule to be measured.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105854823A CN102155965A (en) | 2010-12-04 | 2010-12-04 | Method for measuring weight of powder filled in capsule through comparison |
| CN201110432538.6A CN102538926B (en) | 2010-12-04 | 2011-12-02 | Method for measuring content of filled powdered medicine in capsule |
| CN201110432746.6A CN102564541B (en) | 2010-12-04 | 2011-12-02 | Method for measuring content of medicine powder filled in capsule |
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| CN2010105854823A CN102155965A (en) | 2010-12-04 | 2010-12-04 | Method for measuring weight of powder filled in capsule through comparison |
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| CN102155965A true CN102155965A (en) | 2011-08-17 |
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| CN2010105854823A Pending CN102155965A (en) | 2010-12-04 | 2010-12-04 | Method for measuring weight of powder filled in capsule through comparison |
| CN201110432746.6A Active CN102564541B (en) | 2010-12-04 | 2011-12-02 | Method for measuring content of medicine powder filled in capsule |
| CN201110432538.6A Active CN102538926B (en) | 2010-12-04 | 2011-12-02 | Method for measuring content of filled powdered medicine in capsule |
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| CN201110432746.6A Active CN102564541B (en) | 2010-12-04 | 2011-12-02 | Method for measuring content of medicine powder filled in capsule |
| CN201110432538.6A Active CN102538926B (en) | 2010-12-04 | 2011-12-02 | Method for measuring content of filled powdered medicine in capsule |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112033517A (en) * | 2020-08-26 | 2020-12-04 | 河南省计量科学研究院 | Dynamic calibration method for checkweigher |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2109565B (en) * | 1981-10-20 | 1985-04-17 | Carmichael Fire And Bulk Limit | Weighing flowable materials |
| US5385044A (en) * | 1993-08-25 | 1995-01-31 | Ecolab Inc. | Method of using a thermo-chromatic detergent level indicator |
| GB9926335D0 (en) * | 1999-11-05 | 2000-01-12 | Powderject Res Ltd | Apparatus and method for dispensing small quantities of particles |
| ITBO20040190A1 (en) * | 2004-04-02 | 2004-07-02 | Mg 2 Srl | MACHINE FOR DOSING A PRODUCT INSIDE CAPSULES |
| ITBO20040601A1 (en) * | 2004-09-30 | 2004-12-30 | Ima Spa | METHOD FOR CHECKING CAPSULES |
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2010
- 2010-12-04 CN CN2010105854823A patent/CN102155965A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112033517A (en) * | 2020-08-26 | 2020-12-04 | 河南省计量科学研究院 | Dynamic calibration method for checkweigher |
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| CN102564541B (en) | 2014-02-26 |
| CN102538926B (en) | 2014-02-26 |
| CN102538926A (en) | 2012-07-04 |
| CN102564541A (en) | 2012-07-11 |
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Open date: 20110817 |