CN2857001Y - Fast detector for fresh meat quality - Google Patents
Fast detector for fresh meat quality Download PDFInfo
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- CN2857001Y CN2857001Y CN 200520010507 CN200520010507U CN2857001Y CN 2857001 Y CN2857001 Y CN 2857001Y CN 200520010507 CN200520010507 CN 200520010507 CN 200520010507 U CN200520010507 U CN 200520010507U CN 2857001 Y CN2857001 Y CN 2857001Y
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- fresh meat
- leachate
- spoilage
- switching control
- house steward
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Abstract
A detecting device for quickly detecting spoilage of fresh meat is a pipe-line system comprising an injection opening for the lixivium of sample fresh meat; a cylinder pattern measuring-proof cavity for extractive liquid, which is positioned behind the injection opening and is provided with a switching control valve at each end part; a transfer pump positioned behind the measuring-proof cavity; and a lixivium discharge opening positioned behind the transfer pump. Four electrode terminals are arranged inside of the measuring-proof cavity, namely two current electrodes at the front and back ends and two voltage electrodes positioned at the inner sides of the current electrodes, according to the four-electrode method. The lixivium measuring-proof circuit comprises the four electrode terminals, a sinusoid signal generator, an A-to-D switching device, a stabilized circuit, a calculator, a display and a controller. Comparing with the current device for measuring fresh meat using TVB-N method, the pipe-line system of the utility model has the advantages of that the structure is compact, the operation is simple, the testing time is shorter, the test needs no agent and the device can be made into portable for locale testing.
Description
Technical field
The utility model relates to a kind of pick-up unit of spoilage of fresh meat.
Background technology
Along with improving constantly of China people's living standard, meat products occupies significant proportion in people's diet structure.Because fresh meat is rich in nutritional labeling and moisture, and is very easily putrid and deteriorated, is related to food hygiene, its consequence is influence people healthy, and therefore, it is heavy day by day that the market meat products detects task, and the research of fresh meat freshness detection technique becomes very necessary.At present, domestic check livestock and poultry meat is mainly based on organoleptic examination (vision, sense of smell, sense of touch), and laboratory inspection is auxilliary.And have all more complicated of laboratory method now, therefore, have only when organoleptic examination can not be judged the just chamber of experimentizing calibrating.The main content of measuring volatility base nitrogen (TVB-N) in the fresh meat is with the objective indicator as the evaluation freshness of meat.TVB-N is the volatility alkalescence material that protein produces under the effect of bacterium and catabolic enzyme, the cardinal principle of this method is during according to spoilage of fresh meat, the growth of ion concentration and the metamorphic grade of the fresh meat relation of being proportionate, promptly ion concentration increases along with the progressively rotten of fresh meat.Yet when detecting fresh meat with the TVB-N method, the conditional request of reagent preparation is higher, and expense is big; And operative skill requires high, and minute is long, and instrument is easy cleaning not also.Therefore, existing TVB-N pick-up unit can not adapt to growing needs, more is not suitable for testing at the scene.
Shen Lian waits [" Food Science " 1996 (Vol.17 No.3) clearly, the research of electrochemical process fast detecting meat freshness] show the conductivity and the TVB-N of fresh meat leachate by experiment, total number of bacteria and other comprehensive index of formulating have good correlativity, draw electricity and lead the freshness that can replace these indexs to judge fresh meat.Zhou Dongxiang etc. [" Shanghai Aquatic Products Univ. 9CN)'s journal ", in September, 1997 (Vol.6 No.3) is with the method research of electrochemical process fast detecting freshness of freshwater fish] with silver carp as sample, the relation of conductivity and fresh-water fishes freshness is studied, the conductivity and the TVB-N that have drawn for silver carp have the favorable linearity correlativity, can be with its index as the freshness of judging silver carp.Regrettably, they and other do not have the positive correlation according to the conductivity and the spoilage of fresh meat degree of fresh meat leachate per capita, further propose the concrete grammar and the device of the conductivity of measuring samples fresh meat leachate.
The utility model content
The purpose of this utility model provides a kind of device of fast detecting spoilage of fresh meat.
For reaching the purpose of this utility model, a kind of like this device for fast detecting of spoilage of fresh meat is provided, this device is a piping system.This piping system comprise the sample fresh meat leachate inlet, be positioned at its two ends after this inlet the leachate impedance measurement chamber of the column type of a switching control pilot respectively arranged, be positioned at the discharge pump after this measurements chamber and be positioned at this discharge pump leachate escape hole afterwards.In measuring the chamber, be arranged with four electrode terminals according to four electrode method, that is: its rear and front end is that the inboard of two galvanic electrodes, two galvanic electrodes is two voltage electrodes, and these four electrodes and operational amplifier, sine wave signal generator, A/D conversion equipment, mu balanced circuit, arithmetical unit, display and controller are formed the leachate impedance measuring circuit jointly.
In this pick-up unit, adopting four electrode method is in order to eliminate the influence of contact resistance.The principle of four electrode method is (with reference to figure 2), when electric current I is passed through galvanic electrode (C1, the C2) terminal of resistor R (fluid column of simulation leachate), by voltage U between measuring voltage electrode (P1, the P2) two ends, calculate resistance value R=U/I, such resistor is called four-terminal resistor.When the resistance of voltmeter V is higher, the electric current that flows through voltmeter V very hour, even lead-in wire has resistance (R
P1, R
P2) exist, can not produce big voltage drop, so the reading of voltmeter V can be represented the pressure drop at resistor R two ends yet.In the closed-loop path by galvanic electrode (C1, C2) terminal, even leaded resistance (R
C1, R
C2) exist, flowing through the electric current I of resistor R, also can accurately measure by galvanometer A.Therefore all lead resistances in the circuit are little to the measurement result influence, so R=V/A is arranged.
When detecting, the inlet of sample fresh meat leachate from this device injected; After being defined as the column type fluid column in the measurement chamber of this leachate at this device, logical the going up of two galvanic electrodes detected electric current; Simultaneously, measure the voltage between two voltage electrodes, use formula
Calculate two leachate impedance Z between voltage electrode; Calculate the conductivity of sample fresh meat leachate again; At last, according to the positive correlation of the conductivity and the spoilage of fresh meat degree of fresh meat leachate, determine that the sample fresh meat is whether rotten or judge its metamorphic grade.
From the scheme of above-mentioned realization the utility model purpose, be not difficult to find out, compare with existing device with TVB-N method detection fresh meat, easier with applied principle of the utility model device and method.Because, the responsive parameter of easily measuring again of reaction when conductivity is spoilage of fresh meat.So, detect fresh meat with the method for the utility model utilization, can reach the purpose of fast detecting; From introducing, operation also is not difficult to find out in the step of detection method that the utility model uses, there is not, also do not need to prepare any reagent.Testing cost will reduce widely.Simultaneously, not high to the requirement of detecting operation technical ability yet.Compare with the existing device that detects fresh meat with the TVB-N method, piping system of the present utility model is quite compact, simple to operate, can make portablely as required, is highly suitable for the on-the-spot device that detects.
Below in conjunction with accompanying drawing the utility model is further described.
Description of drawings
The systematic schematic diagram of the device for fast detecting of Fig. 1---spoilage of fresh meat of the present utility model
Fig. 2---the four electrode method schematic diagram that the utility model adopted
Fig. 3---measure the partial enlarged drawing in chamber among Fig. 1
Embodiment
A kind of device for fast detecting of spoilage of fresh meat, this device are a piping system (with reference to figure 1).This piping system comprise the sample fresh meat leachate inlet 1, be positioned at its two ends after this inlet 1 the leachate impedance measurement chamber 2 of the column type of a switching control pilot (V1, V2) respectively arranged, be positioned at the discharge pump 3 after this measurements chamber 2 and be positioned at this discharge pump 3 leachate escape hole 4 afterwards.Leachate escape hole 4 inserts in the waste collection case.Be arranged with four electrode terminals according to four electrode method in measuring chamber 2, that is: its rear and front end is that the inboard of two galvanic electrodes (C1, C2), two galvanic electrodes (C1, C2) is two voltage electrodes (P1, P2).These four electrodes and operational amplifier, sine wave signal generator, A/D conversion equipment, mu balanced circuit, arithmetical unit, display and controller are formed the leachate impedance measuring circuit jointly.
Disclose so far, those skilled in the art only by conventional electronic production and debugging, just can correctly reproduce the utility model again in conjunction with superiority introduction of the present utility model; Can also require to design its technical characterictic various installed identical according to some additional performance with the essential features of device of the present utility model.So the disclosed content of above-mentioned embodiment also is following each routine summation, in following each example, do not give unnecessary details with the identical content of this summation part.
Embodiment 1 (with reference to figure 1):
This example is on the basis of said summation part, the instantiation that this device for fast detecting, especially wherein leachate impedance measuring circuit are enumerated.
In this example, sine wave signal generator, A/D conversion equipment and arithmetical unit are connected with controller respectively, and controller is connected with display again with arithmetical unit.The signal output part of this sine wave signal generator successively with a galvanic electrode C1, described measurement chamber 2 in input end polyphone of fresh meat leachate, another galvanic electrode C2 and an operational amplifier A 2, another input end grounding of this operational amplifier A 2; The output terminal that described two voltage electrodes (P1, P2) are connected to these two operational amplifiers (A1, A2) on two input ends of another operational amplifier A 1 is connected with the A/D conversion equipment respectively.
Embodiment 2 (with reference to figure 1):
This example is on the basis of summation part or embodiment 1, and this device for fast detecting is carried out an improved example.The part identical with them do not given unnecessary details.
In this example, be provided with a photoelectric sensor S1 at leachate inlet 1 and apart from it between the nearest switching control pilot V1, respectively be provided with a photoelectric sensor (S2, S3) at two galvanic electrodes (C1, C2) and apart between their nearest separately switching control pilots (V1, V2); Three photoelectric sensors (S1, S2, S3) all are connected with controller.
Embodiment 3 (with reference to figure 1):
This example is on the basis of said summation part, embodiment 1 or embodiment 2, to giving an example that this device for fast detecting further improves.The part identical with them do not given unnecessary details.
In this example, the switching control pilot V2 of close discharge pump 3 (discharge pump 3 in this example is peristaltic pump) is a two position two-way valve, and the switching control pilot V1 of close leachate inlet 1 is three two-port valves.Be connected with one at these three two-port valve places and clean house steward 5, be connected with distilled water input pipe 6, salt water inlet pipe 7 on this cleaning house steward 5 and be positioned at the pressurized air input pipe 8 of distal-most end.This distilled water input pipe 6, salt water inlet pipe 7 respectively have three two-port valves (V3, V4) with the connection place of cleaning house steward 5, and pressurized air input pipe 8 has a two position two-way valve V5 with the connection place of cleaning house steward 5.
Embodiment 4 (with reference to figure 1):
This example is on the basis of embodiment 3, and is further improved for example to it.The part identical with embodiment 3 do not given unnecessary details.
In this example, three all two-port valves all are connected with controller by a multi-way switch with two position two-way valve (V1, V2, V3, V4, V5).
Now, the device of utilization embodiment 4, whether detection step rotten or its metamorphic grade is further disclosed to fresh meat.
When each the measurement:
(1) with disposable needle tubing the leachate of sample fresh meat is injected this piping system from inlet 1.
(2) after photoelectric sensor S1 has the leachate signal, by the multi-way switch of controller control switching control pilot V1 is transferred to the position that allows leachate can enter measurement chamber 2, start peristaltic pump (being discharge pump 3) simultaneously chamber 2 is measured in the leachate inspiration.
(3) after photoelectric sensor S2, S3 all have the leachate signal, by the multi-way switch of controller control switching control pilot V1 and switching control pilot V2 are transferred to off-position, then begin to measure record and video data.Wherein, the electric current of two galvanic electrodes (C1, C2) of flowing through adopts sinusoidal ac signal, and sine wave signal generator adopts the controlled programmable signal generator chip of frequency.Only need select the fixed frequency relatively sensitiveer, for example a 1kHz when doing general mensuration for use to sample.When spoilage of fresh meat, the conductivity of rotten sample will be higher than the conductivity of normal sample, and sensor two terminal impedances diminish, and size and character (character comprises capacitive character and resistive etc.) according to impedance calculate rotten grade by the arithmetical unit that links to each other with controller.
The utilization computing formula is respectively
With
Wherein, Z---the leachate impedance between two voltage electrodes (P1, P2)
---the voltage between two voltage electrodes (P1, P2);
ρ---leachate conductivity
D---the diameter of column type leachate
L---and the distance between two voltage electrodes (P1, P2)
Then, according to the positive correlation of this conductivity and spoilage of fresh meat degree, judge whether it goes bad and rotten degree.
Optional multi-frequency pattern when making classification and determination, along with frequency increases, whole measuring process will increase.
(4) measurement data that directly shows according to the display in the pick-up unit draws the rotten grade of meat.
(5) measure finish after, come by-pass cock operation valve V1 by controller by multi-way switch, allow testing conduit with clean house steward 5 UNICOMs; Then, open three two-port valves (V3, V4) and two position two-way valve V5 by controller in turn by multi-way switch, allow distilled water input pipe 6, salt water inlet pipe 7 and pressurized air input pipe 8 take turns and cleaning house steward 5 UNICOMs, with the compressed air rinsing testing conduit after distilled water, salt solution, the filtration.Finish one-time detection.
Claims (7)
1, a kind of device for fast detecting of spoilage of fresh meat is characterized in that, this device is a piping system; This piping system comprise the sample fresh meat leachate inlet (1), be positioned at this inlet (1) its two ends afterwards the leachate impedance measurement chamber (2) of the column type of a switching control pilot (V1, V2) respectively arranged, be positioned at this measurement chamber (2) afterwards discharge pump (3) and be positioned at this discharge pump (3) leachate escape hole (4) afterwards; In measuring chamber (2), be arranged with four electrode terminals according to four electrode method, its rear and front end be that the inboard of two galvanic electrodes (C1, C2), two galvanic electrodes (C1, C2) is two voltage electrodes (P1, P2), these four electrodes and operational amplifier, sine wave signal generator, A/D conversion equipment, mu balanced circuit, arithmetical unit, display and controller are formed the leachate impedance measuring circuit jointly.
2, the device for fast detecting of spoilage of fresh meat according to claim 1 is characterized in that: described sine wave signal generator, A/D conversion equipment and arithmetical unit are connected with controller respectively, and controller is connected with display again with arithmetical unit; The signal output part of this sine wave signal generator successively with a galvanic electrode (C1), described measurement chamber (2) in input end polyphone of fresh meat leachate, another galvanic electrode (C2) and an operational amplifier (A2), another input end grounding of this operational amplifier (A2); Described two voltage electrodes (P1, P2) are connected on two input ends of another operational amplifier (A1); The output terminal of these two operational amplifiers (A1, A2) is connected with described A/D conversion equipment respectively.
3, the device for fast detecting of spoilage of fresh meat according to claim 1 and 2, it is characterized in that: be provided with a photoelectric sensor (S1) at described leachate inlet (1) and apart from it between the nearest switching control pilot (V1), respectively be provided with a photoelectric sensor (S2, S3) at described galvanic electrode (C1, C2) and apart between their nearest separately switching control pilots (V1, V2); Three photoelectric sensors (S1, S2, S3) all are connected with described controller.
4, the device for fast detecting of spoilage of fresh meat according to claim 1 and 2 is characterized in that, the switching control pilot (V2) of close described discharge pump (3) is a two position two-way valve; Switching control pilot (V1) near described leachate inlet (1) is three two-port valves, be connected with one at these three two-port valve places and clean house steward (5), be connected with distilled water input pipe (6), salt water inlet pipe (7) on this cleaning house steward (5) and be positioned at the pressurized air input pipe (8) of distal-most end; This distilled water input pipe (6), salt water inlet pipe (7) respectively have three two-port valves (V3, V4) with the connection place of cleaning house steward (5), and pressurized air input pipe (8) has a two position two-way valve (V5) with the connection place of cleaning house steward (5).
5, the device for fast detecting of spoilage of fresh meat according to claim 3 is characterized in that, the switching control pilot (V2) of close described discharge pump (3) is a two position two-way valve; Switching control pilot (V1) near described leachate inlet (1) is three two-port valves, be connected with one at these three two-port valve places and clean house steward (5), be connected with distilled water input pipe (6), salt water inlet pipe (7) on this cleaning house steward (5) and be positioned at the pressurized air input pipe (8) of distal-most end; This distilled water input pipe (6), salt water inlet pipe (7) respectively have three two-port valves (V3, V4) with the connection place of cleaning house steward (5), and pressurized air input pipe (8) has a two position two-way valve (V5) with the connection place of cleaning house steward (5).
6, the device for fast detecting of spoilage of fresh meat according to claim 4 is characterized in that, three all two-port valves all are connected with described controller by a multi-way switch with two position two-way valve (V1, V2, V3, V4, V5).
7, the device for fast detecting of spoilage of fresh meat according to claim 5 is characterized in that, three all two-port valves all are connected with described controller by a multi-way switch with two position two-way valve (V1, V2, V3, V4, V5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520010507 CN2857001Y (en) | 2005-12-14 | 2005-12-14 | Fast detector for fresh meat quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520010507 CN2857001Y (en) | 2005-12-14 | 2005-12-14 | Fast detector for fresh meat quality |
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| Publication Number | Publication Date |
|---|---|
| CN2857001Y true CN2857001Y (en) | 2007-01-10 |
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|---|---|---|---|
| CN 200520010507 Expired - Lifetime CN2857001Y (en) | 2005-12-14 | 2005-12-14 | Fast detector for fresh meat quality |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100343659C (en) * | 2005-12-14 | 2007-10-17 | 重庆大学 | Method and apparatus for quickly detecting spoilage of fresh meat |
| CN103760193A (en) * | 2014-02-13 | 2014-04-30 | 南京农业大学 | Method for quickly identifying freezing-thawing frequency of poultry meat |
| CN109564650A (en) * | 2016-07-22 | 2019-04-02 | 开利公司 | Sanitation management system for Perishable Freight Transport |
-
2005
- 2005-12-14 CN CN 200520010507 patent/CN2857001Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100343659C (en) * | 2005-12-14 | 2007-10-17 | 重庆大学 | Method and apparatus for quickly detecting spoilage of fresh meat |
| CN103760193A (en) * | 2014-02-13 | 2014-04-30 | 南京农业大学 | Method for quickly identifying freezing-thawing frequency of poultry meat |
| CN103760193B (en) * | 2014-02-13 | 2015-07-01 | 南京农业大学 | Method for quickly identifying freezing-thawing frequency of poultry meat |
| CN109564650A (en) * | 2016-07-22 | 2019-04-02 | 开利公司 | Sanitation management system for Perishable Freight Transport |
| CN109564650B (en) * | 2016-07-22 | 2024-05-10 | 开利公司 | Sanitation management system for perishable cargo transportation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20051214 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |