CN201662547U - Milk freezing point tester - Google Patents
Milk freezing point tester Download PDFInfo
- Publication number
- CN201662547U CN201662547U CN201020118552XU CN201020118552U CN201662547U CN 201662547 U CN201662547 U CN 201662547U CN 201020118552X U CN201020118552X U CN 201020118552XU CN 201020118552 U CN201020118552 U CN 201020118552U CN 201662547 U CN201662547 U CN 201662547U
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- Prior art keywords
- freezing point
- milk
- temperature
- point tester
- ultrasonic
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- Expired - Fee Related
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Abstract
The utility model discloses a milk freezing point tester, which comprises a power board, a temperature measuring platform, a control processing component, a casing, a man-machine interactive platform and an ultrasonic excitation device which is used for evenly exciting fluid to be tested. The control processing component is connected with the temperature measuring platform and the man-machine interactive platform. The ultrasonic excitation device is connected with the control processing component. The ultrasonic excitation device comprises an ultrasonic transducer and an ultrasonic generator. The milk freezing point tester can quickly and accurately measure freezing point value of milk samples, accordingly control purchase quality and inspection quality of milk, is helpful for increasing productivity of milk products, is more convenient for field operation because the price of the finished tester is far lower than that of imported equipment and both volume and weight are smaller than that of past instruments, and can reduce production cost of the milk products after popularization and application.
Description
Technical field
The utility model belongs to electronics and computer application field, particularly a kind of freezing point tester that is used to measure the raw milk relative moisture content.
Background technology
Current social dairy produce has been a kind of food very universal during people live, and the quality of its quality has become the important content that people extremely pay attention to.For the manufacturing enterprise of dairy products, its quality as raw-material milk will cause direct influence to manufactured goods.Excessive water mixing, doping not only force enterprise to replenish the production technology link, increase production cost, have also caused the waste of the energy simultaneously.At present, the international method of detection milk relative moisture content is a cryoscopic method.This is that no matter water mixing or doping, the variation of its freezing point is all with fairly obvious because the freezing point of milk is a more stable physical quantity.
Freezing point is that the solid-liquid of material coexists and a critical temperature during balance mutually.Measure this temperature of milk, the sample of milk can being suckled is put in the cold-trap, in below freezing cold excessively, cross when being chilled to a certain fixed temperature when newborn sample, carry out seeding, separate out heat during crystallization, make newborn sample temperature recovery to peak, and keep constant at short notice, constitute the freezing point temperature platform.Read the freezing point value that this temperature is newborn sample.
At present domestic similar instrument volume is big, weight big, stirred crystallization poor quality, so popularization degree and utilization factor are lower, the total quality that has also influenced milk on certain aspect detects.And overseas equipment, it costs an arm and a leg on the one hand, and is incompatible with domestic actual operating position on function on the other hand.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of volume little, in light weight at the deficiencies in the prior art, and crystalline is measured by freezing test comes the electronic device of test sample relative moisture content to milk.
In order to solve above-mentioned technical matters, the technical solution of the utility model is as follows:
A kind of milk freezing point tester, comprise power module, temperature survey platform, control treatment part, housing, man-machine conversation platform, control treatment part is connected with the man-machine conversation platform with the temperature survey platform, it is characterized in that, also comprise the ultrasonic exciting device that is used to make the even exciting of fluid to be measured, this ultrasonic exciting device is connected with control treatment part.
Described power module is a Switching Power Supply.
Described ultrasonic wave excitation device comprises ultrasonic transducer and ultrasonic generator, and ultrasonic transducer places the measuring table rear.
Described temperature survey platform comprises the test tube and the temperature probe that is connected successively, lifting arm, bridge for measuring temperature, operational amplifier, A/D converter that is used to hold fluid to be measured, also comprises the normal voltage generation circuit that links to each other with bridge for measuring temperature, A/D converter, the semiconductor cold-trap that places the test tube outside; Temperature probe places the centre of temperature survey platform and ultrasonic transducer.
Described lifting arm is connected with step motor by worm gearing.
Described man-machine conversation platform comprises LCDs, control panel.
Described temperature probe is high-precision beaded glass type thermistor, adopts 16 A/D converters of high precision, and proofreaies and correct bridge for measuring temperature with software mode, and described normal voltage generation circuit has adopted has the integrated from the temperature control Voltage stabilizing module of temperature compensation.
Described semiconductor cold-trap has adopted semiconductor chilling plate to freeze, and adopts the secondary refrigeration modes, for the precision that guarantees to measure, has adopted the closed loop thermal control circuit in condenser temperature control.
Realize the mensuration of freezing point platform with corresponding software, make the measurement degree of stability of instrument higher, reliability is stronger, speed is faster, described software mode is proofreaied and correct temperature measurement circuit, comprise two aspects: the one, temperature probe is placed mixture of ice and water, by the arm resistance of adjusting bridge for measuring temperature the corresponding A/D conversion value of observed temperature is adjusted to 7FFFH (sixteen bit system representation), finish zeroing; The 2nd, when calibrating with titer, in software according to measured value to former temperature---voltage curve is done linear transformation, set up new temperature---voltage curve.By entering normal operating conditions together after the calibration, the observed temperature value will be corresponding one by one with the A/D value according to the new curve that software is set up.
According to GB/T-1995 in the Chinese food industrial standard " the cow's milk method of inspection ", the utility model adopts two kinds of titer calibrations, i.e. A titer and B titers.Its FPD=408m ℃ of " A " calibration solution, its FPD of " B " calibration criterion liquid is 600m ℃.Start shooting every day and must calibrate analyzer after the preheating, after calibration is normal, can detect the freezing point value of milk.
The utility model has the advantages that, adopted energy-efficient, volume is little, lightweight Switching Power Supply; With the little ultrasonic wave excitation system that can make the advanced person of the even vibration of liquid in light weight of volume; Lifting arm by the worm drive lifting arm, makes the back and forth movement direction face of lifting arm vertical with the rotation direction face of motor with advanced step motor technology, avoids causing the motor permanent damages because of external force.Complete machine manufacturing cost and use cost are all relatively low.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is another structural representation of the present utility model.
Fig. 3 is a theory diagram of the present utility model.
Fig. 4 is the utility model program flow diagram.
Fig. 5 is a mensuration program flow diagram of the present utility model.
Fig. 6 is a ultrasonic wave excitation member principle block diagram of the present utility model.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
The thermosensitive resistance measurement specimen temperature is converted into voltage signal by bridge for measuring temperature, compares, calculates its freezing point value after amplifying, and the commentaries on classics calculation is water percentage.
The basic mechanical design feature index of this instrument is as follows:
Temperature-measuring range: 0.0000 ℃～-1.0000 ℃
Thermometric resolution: 0.0001 ℃
Freezing point thermometric precision: less than ± 4m ℃
Sample size: 2.5 ± 0.1ml
Detection time: 2～3min
Operating ambient temperature: 10～30 ℃
With reference to the accompanying drawings 1, man-machine conversation platform 10 comprises that LCDs 22, control panel 23, control panel have a plurality of tactile keyboards 14, corresponding running program separately.
With reference to the accompanying drawings 2, accompanying drawing 3, milk freezing point tester comprises Switching Power Supply 24, control treatment part 1, ultrasonic wave excitation parts 2, temperature survey platform 100, man-machine conversation platform 10, mini-printer 102, housing 7.24 of described Switching Power Supplies and control processing circuit rear and close housing 7, wherein control treatment part 1 is connected with ultrasonic exciting parts 2, temperature survey platform 100, man-machine conversation platform 10, mini-printer 102, mini-printer 102 is positioned at the right front of housing 7 bottoms, and mini-printer 102 is the apolegamy device.Ultrasonic exciting parts 2 comprise ultrasonic generator 106 and ultrasonic transducer 107, and ultrasonic transducer 107 is arranged on temperature survey platform 100 rears.Temperature survey platform 100 comprises successively the high precision measuring temperature sensor 11 that connects, lifting arm 25, bridge for measuring temperature, operational amplifier, A/D converter, the normal voltage generation circuit 16 that links to each other with bridge for measuring temperature, A/D converter, temperature probe 11 is partly drawn from temperature survey platform 100 intermediate hollows, during test, change by software detection temperature sensor temperature value, and make ultrasonic transducer 107 correspondingly carry out the ultrasound wave radiation test fluid.Described lifting arm 25 is with advanced step motor technology, by worm screw control lifting arm 25, makes the back and forth movement direction face of lifting arm 25 vertical with the rotation direction face of motor, has avoided causing the motor permanent damages because of external force.In order to reduce the volume of motor, alleviate complete machine weight, lifting arm selects for use hardness higher, the material of lighter weight (as engineering plastics etc.).
At test tube 14 arranged outside semiconductor cold-traps 17, temperature probe 11 places in the test tube 14,3～8 millimeters apart from the test tube bottom.Contain non freezing solution in the space between test tube 14 and measuring seat 19 (not shown)s and be convenient to conduct heat.
Referring to Fig. 4, be the use process flow diagram of milk freezing point tester, the time in whole correction and measuring process is to realize by real-time clock control assembly 109.
At first connect the power switch of analyzer back, preheating 20 minutes (deciding) according to environment temperature.At first to calibrate before each the detection.When display screen 22 " thermometric " becomes " school A ", represent that analyzer semiconductor cold-trap 17 has reached working temperature.Analyzer can detect.
With putting into the test tube flat 19 of freezing point apparatus behind 2.5+0.1 milliliter " A " the calibration criterion liquid injecting tube, press " school A " button on the panel 23, the temperature probe 11 that has thermistor enters in the test tube solution with lifting arm 25, the calibration beginning.In " school A " process, Ice making machine at first show " carrying out school A ... " on the display panelShake soon test tube 14 about 2 seconds of ultrasonic transducer 107 after about 1 minute, analyzer is measured temperature survey platform 100, calibrates simultaneously.When display screen 22 showed " school A:-0.4080 ", expression was calibrated successfully.This moment, lifting arm 25 rose automatically.If display screen 22 shows " school A failure " or " whether taking calibration solution by mistake ", then use " A " titer to recalibrate.
The standard value error of the freezing point value temperature of surveying and A calibration criterion liquid be no more than 2m ℃, it is qualified to think, carries out next step, as surpassing 2m ℃, needs to recalibrate.
With putting into the test tube flat 19 of freezing point apparatus behind 2.5+0.1 milliliter " B " the calibration criterion liquid injecting tube, press " school B " button on the lower panel 23, temperature probe 11 enters in the test tube 14 with lifting arm 25, and " school B " tests beginning.The same school of following steps " A " testing procedure.
Calibration finishes, and display screen " school B " becomes " school B:-0.6000 ", and expression is calibrated successfully.This moment, lifting arm 25 rose automatically, waited for test next time.
If display screen shows " school B failure " or " whether taking titer by mistake ", then use " B " titer and recalibrate.
After finishing with the calibration of 2 kinds of titers, can detect the milk sample.With putting into the test tube flat 14 of freezing point apparatus behind the 2.5+0.1 ml milk milk sample injecting tube, press " startup " button on the panel 23, lifting arm 25 descends, the test beginning.Detection finishes, and lifting arm 25 rises automatically.LCDs 22 shows milk milk sample freezing point value and relative moisture content thereof.
Adopt data to be stored in the nonvolatile memory 108, analyzer has mini-printer 102 ports, the user can come out test result single or Print All as required, also can be connected the unloading that realizes data with external communication device 101 by the RS232 interface.
As shown in Figure 5, ultrasonic wave excitation parts 2 make ultrasonic generator 106 drive ultrasonic transducer 107 startups by the control signal of control treatment part 1, produce the ultrasonic vibration test fluid, and Fig. 6 is the ultrasound wave workflow diagram.
Claims (9)
1. milk freezing point tester, comprise power module, temperature survey platform, control treatment part, housing, man-machine conversation platform, control treatment part is connected with the man-machine conversation platform with the temperature survey platform, it is characterized in that, also comprise the ultrasonic exciting device that is used to make the even exciting of fluid to be measured, this ultrasonic exciting device is connected with control treatment part.
2. according to the milk freezing point tester of claim 1, it is characterized in that described power module is a Switching Power Supply.
3. according to the milk freezing point tester of claim 1, it is characterized in that the ultrasonic wave excitation parts comprise ultrasonic transducer and ultrasonic generator composition, ultrasonic transducer places the temperature survey platform rear.
4. milk freezing point tester according to claim 1, it is characterized in that, described temperature survey platform comprises the test tube and the temperature probe that is connected successively, lifting arm, bridge for measuring temperature, operational amplifier, A/D converter that is used to hold fluid to be measured, also comprises the normal voltage generation circuit that links to each other with bridge for measuring temperature, A/D converter, the semiconductor cold-trap that places the test tube outside; Temperature probe places the centre of temperature survey platform and ultrasonic transducer.
5. milk freezing point tester according to claim 4 is characterized in that described lifting arm is connected with step motor by worm gearing.
6. milk freezing point tester according to claim 1 is characterized in that: described man-machine conversation platform comprises LCDs, control panel.
7. milk freezing point tester according to claim 4, its feature with: described temperature probe is high-precision beaded glass type thermistor, adopts 16 A/D converters of high precision.
8. milk freezing point tester according to claim 4, its feature adopt and have the integrated from the temperature control Voltage stabilizing module of temperature compensation producing circuit with: described normal voltage.
9. milk freezing point tester according to claim 4, its feature with, described semiconductor cold-trap has adopted semiconductor chilling plate to freeze, and adopts the secondary refrigeration modes, adopts the closed loop thermal control circuit in condenser temperature control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020118552XU CN201662547U (en) | 2010-02-25 | 2010-02-25 | Milk freezing point tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020118552XU CN201662547U (en) | 2010-02-25 | 2010-02-25 | Milk freezing point tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201662547U true CN201662547U (en) | 2010-12-01 |
Family
ID=43232967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020118552XU Expired - Fee Related CN201662547U (en) | 2010-02-25 | 2010-02-25 | Milk freezing point tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201662547U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914584A (en) * | 2012-09-29 | 2013-02-06 | 南昌大学 | Rapid detection system and detection method for lactogenesis mixing |
| CN106018460A (en) * | 2016-06-27 | 2016-10-12 | 东莞理工学院 | Measurement device and method for quickly measuring condensation point of liquid drop |
-
2010
- 2010-02-25 CN CN201020118552XU patent/CN201662547U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914584A (en) * | 2012-09-29 | 2013-02-06 | 南昌大学 | Rapid detection system and detection method for lactogenesis mixing |
| CN102914584B (en) * | 2012-09-29 | 2015-04-15 | 南昌大学 | Rapid detection system and detection method for lactogenesis mixing |
| CN106018460A (en) * | 2016-06-27 | 2016-10-12 | 东莞理工学院 | Measurement device and method for quickly measuring condensation point of liquid drop |
| CN106018460B (en) * | 2016-06-27 | 2019-04-26 | 东莞理工学院 | A kind of measuring device and method for rapid survey drop condensation point |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101201 Termination date: 20170225 |