CN110261257B - Method and device for judging precooling effect of spherical fruits - Google Patents
Method and device for judging precooling effect of spherical fruits Download PDFInfo
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- CN110261257B CN110261257B CN201910381242.2A CN201910381242A CN110261257B CN 110261257 B CN110261257 B CN 110261257B CN 201910381242 A CN201910381242 A CN 201910381242A CN 110261257 B CN110261257 B CN 110261257B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
Abstract
In order to solve the problem of inaccurate result obtained by a method for measuring the spherical fruit precooling effect in the prior art, the invention provides a method and a device for judging the spherical fruit precooling effect, wherein the temperature and the humidity in a closed measuring chamber are adjusted to set values; then, taking out the refrigerated spherical fruits, enabling the spherical fruits to contact with atmospheric air for heat exchange, and putting the spherical fruits into a measuring chamber when the surface temperature of the spherical fruits is the same as the temperature value of the measuring chamber; setting the test duration and the mass loss rate value range; then, measuring the quality loss rate of the spherical fruits in real time, and reducing the value of the quality loss rate by reducing the temperature in the measuring chamber when the value of the quality loss rate of the spherical fruits is out of the range of the set value; and when the value of the mass loss rate is within the set value range, keeping the temperature in the measuring chamber until the preset test duration is reached. The method can ensure that the result of measuring the precooling effect of the spherical fruits is more accurate.
Description
Technical Field
The invention relates to the field of fruit precooling effect verification, in particular to a method and a device for judging a spherical fruit precooling effect.
Background
The fruits survive in the form of living bodies after being picked. Its own nutrients and moisture are continuously reduced and cannot be supplemented, the quality thereof is continuously reduced, and the storage period is greatly shortened. Pre-cooling refers to rapidly reducing the temperature of the fruit to a temperature suitable for storage by refrigeration techniques. Researches show that the rotting rate of the fruits which are not subjected to the pre-cooling treatment only reaches 25% -30% in the transportation process, and the rotting rate can be reduced to 3% -10% after the pre-cooling treatment. Therefore, the precooling treatment can effectively reduce the field heat of the fruits and prolong the storage period of the fruits, and plays an important role in ensuring the quality of the fruits. The criterion for judging the precooling effect is the change of the temperature and the quality loss rate of the fruit. The method has important practical significance and economic significance for simply and effectively measuring the temperature and the mass loss rate of the spherical fruits.
The existing spherical fruit precooling effect is also measured through the change of the mass loss rate, but the adopted mode is that the spherical fruit is placed in an environment with constant temperature, such as 0.5-2 ℃, and the mass loss rate is measured and calculated after the spherical fruit is kept for a period of time, so that the judgment of the spherical fruit precooling effect is realized.
In the process of the above method, since the mass loss rate of the spherical fruit is continuously changed at a constant temperature, the temperature is not necessarily constant even in the process of performing cold storage of the spherical fruit. Therefore, the existing method for measuring the precooling effect of the spherical fruit has inaccuracy.
Disclosure of Invention
In order to solve the problem that the result obtained by a method for measuring the spherical fruit precooling effect in the prior art is inaccurate, the invention provides a method and a device for judging the spherical fruit precooling effect.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for judging the precooling effect of spherical fruits adopts the technical scheme that: firstly, adjusting the temperature and the humidity in a closed measuring chamber to set values; then, taking out the refrigerated spherical fruits, enabling the spherical fruits to contact with atmospheric air for heat exchange, and putting the spherical fruits into a measuring chamber when the surface temperature of the spherical fruits is the same as the temperature value of the measuring chamber; setting the test duration and the mass loss rate value range; then, measuring the quality loss rate of the spherical fruits in real time, and reducing the value of the quality loss rate by reducing the temperature in the measuring chamber when the value of the quality loss rate of the spherical fruits is out of the range of the set value; and when the value of the mass loss rate is within the set value range, keeping the temperature in the measuring chamber until the preset test duration is reached.
A device comprises a measuring chamber for measuring, a temperature control assembly for adjusting the temperature in the measuring chamber, a humidity control assembly for adjusting the humidity in the measuring chamber, a pressure sensor for acquiring the quality of spherical fruits, a temperature and humidity integrated sensor for acquiring the temperature and humidity in the measuring chamber and a control assembly;
the control assembly is electrically connected with the temperature and humidity integrated sensor and is used for collecting and measuring the indoor temperature and humidity;
the control assembly is electrically connected with the pressure sensor and the temperature control assembly respectively and used for collecting data of the pressure sensor, obtaining the mass loss rate of the spherical fruits according to the mass data, comparing the obtained mass loss rate with a set mass loss rate value range, controlling the temperature control assembly according to a comparison result and adjusting the temperature and the humidity in the measuring chamber.
The invention has the beneficial effects that: according to the invention, the temperature and humidity in the space for storing the spherical fruits are adjusted by monitoring the value of the mass loss rate of the spherical fruits, so that the mass loss rate of the spherical fruits is always kept at a stable stage, and the result of measuring the precooling effect of the spherical fruits is more accurate.
Drawings
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
Detailed Description
The present application is further described below with reference to the accompanying drawings.
As shown in fig. 1, a method for judging the precooling effect of spherical fruits has the technical scheme that: firstly, adjusting the temperature and the humidity in a closed measuring chamber 5 to set values; then, taking out the refrigerated spherical fruits, enabling the spherical fruits to contact with atmospheric air for heat exchange, measuring by using an infrared temperature measurer, and putting the spherical fruits into a measuring chamber 5 when the surface temperature of the spherical fruits is the same as the temperature value of the measuring chamber; setting the test duration and the mass loss rate value range; then, measuring the quality loss rate of the spherical fruits in real time, and reducing the value of the quality loss rate by reducing the temperature in the measuring chamber 5 when the value of the quality loss rate of the spherical fruits is out of the set value range; and when the value of the mass loss rate is within the set value range, keeping the temperature in the measuring chamber until the preset test duration is reached.
The basic concept of the invention is as follows: and under the condition of ensuring that the quality loss rate of the spherical fruits is basically unchanged, measuring the final quality loss rate of the spherical fruits after a period of time, thereby obtaining the optimal value of the precooling effect of the spherical fruits. Different from the traditional measuring and calculating means, the method can be more suitable for the actual scene and obtain more accurate results. Meanwhile, the method can also be applied to spherical fruits or other objects needing to be refrigerated, and the refrigerated objects can be stored for a longer time by means of keeping the quality loss rate and controlling the temperature and the humidity of the stored objects.
As shown in fig. 2, an apparatus using the method for determining the pre-cooling effect of spherical fruits has the following technical scheme: the device comprises a measuring chamber 5 for measuring, a variable frequency fan 4 for adjusting the temperature in the measuring chamber 5, a container 11 for adjusting the humidity in the measuring chamber 5, wherein an evaporation solution, a pressure sensor 8 for acquiring the quality of spherical fruits, a temperature and humidity integrated sensor 10 for acquiring the temperature and the humidity in the measuring chamber 5, a display 12 and a main control unit 13 are arranged in the container 11; the main control unit 13 is electrically connected with the temperature and humidity integrated sensor 10 and is used for collecting the temperature and humidity in the measuring chamber 5; the main control unit 13 is electrically connected with the pressure sensor 8 and the variable frequency fan 4 respectively, and is used for collecting data of the pressure sensor 8, obtaining the mass loss rate of the spherical fruits according to the mass data, comparing the obtained mass loss rate with a set mass loss rate value range, controlling the temperature control assembly according to a comparison result, and adjusting the temperature and the humidity in the measuring chamber.
Specifically, the measuring chamber 5 is composed of an organic glass box body 6, and heat-insulating cotton is arranged on the outer side of the organic glass box body 6, and the thickness of the heat-insulating cotton is 1 cm; the plexiglass cabinet 6 forms a refrigeration chamber 3. In the traditional mode, the spherical fruits are directly put into the refrigerating chamber 3 for measurement, but the airflow is not smooth due to the fact that the refrigerating chamber 3 is a cuboid, and the cooling speed is low.
In order to ensure a rapid decrease of the temperature inside the measuring chamber 5, the temperature control assembly comprises a refrigeration unit for adjusting the inside of the measuring chamber 5 and an L-shaped baffle 9A arranged above the pressure sensor 8; the L-shaped baffle 9A is arranged in the measuring chamber 5 in an inverted mode, the short side of the L-shaped baffle 9A is connected with the bottom surface of the measuring chamber 5, and the outer side face of the long side of the L-shaped baffle 9A and the measuring chamber 5 form an air return duct 9.
Specifically, the refrigeration unit includes frequency conversion fan 4, refrigeration piece 2 and radiator 1, and wherein, the working gas circuit of frequency conversion fan 4 is: the airflow sucked by the variable frequency fan 4 is firstly cooled through the radiator 1, then passes through the refrigerating sheet 2 and enters the input end of the variable frequency fan 4; the output end of the variable frequency fan 4 is arranged on the short edge of the L-shaped baffle 9A and supplies air to the space formed by the long edge of the L-shaped baffle 9A and the bottom surface of the measuring chamber 5. After entering the space formed by the long edge of the L-shaped baffle plate 9A and the bottom surface of the measuring chamber 5, the cold air is discharged from a hot air outlet 5A arranged on the bottom surface of the measuring chamber 5 through an air return duct 9. Preferably, the hot gas outlet 5A is provided on the bottom surface of the measuring chamber 5 on the side close to the variable frequency fan 4.
In order to measure accurately, the pressure sensor 8 and the temperature and humidity integrated sensor 10 are arranged between the inner side surface of the long side of the L-shaped baffle 9A and the bottom surface of the measuring chamber 5.
Further, the control assembly comprises a display 12 and a main control unit 13; the display 12 is electrically connected with the main control unit 13 and is used for displaying temperature and humidity data collected by the main control unit 13 and the quality loss rate of the spherical fruits arranged in the measuring chamber 5; the main control unit 13 comprises a single chip microcomputer system and a data acquisition instrument 14; the data acquisition instrument 14 acquires data of the pressure sensor 8 and the temperature and humidity integrated sensor 10 and transmits the data to the single chip microcomputer system. The single chip microcomputer system judges temperature and humidity data and data of the quality loss rate of the spherical fruits according to needs, and measures the final quality loss rate of the spherical fruits after a period of time under the condition that the quality loss rate of the spherical fruits is basically unchanged, so that the optimal value of the precooling effect of the spherical fruits is obtained.
For convenient observation, an anemoscope 7 is arranged in the measuring chamber 5; the anemometer 7 may be electrically connected to the control assembly, send wind speed information to the main control unit 13, and be displayed in the display 12.
Specifically, the evaporation solution provided in the container 11 may be a sodium chloride solution.
Specifically, the display 12 may be an LCD12864 LCD.
Specifically, the model of the pressure sensor 8 may be an HX711 pressure sensor.
Specifically, the type of the temperature and humidity integrated sensor 10 may be an AMT1001 temperature and humidity integrated sensor.
Specifically, the variable frequency fan 4 may be a G-100A variable frequency fan.
Specifically, the type of the single chip microcomputer in the single chip microcomputer system is STC89C52RC single chip microcomputer.
Specifically, the data acquisition instrument 14 may be a paperless recorder MIK-R200D.
Similarly, the control unit of the present invention may further comprise a keyboard, such as a QYF-JP02 keyboard, for inputting the temperature, humidity, mass loss rate, etc. set in the measuring chamber 5.
The square description in the invention is based on FIG. 2; meanwhile, the technologies not described in detail in the present invention are the prior arts.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. The utility model provides a judge device of spherical fruit precooling effect which characterized in that: the fruit quality measuring device comprises a measuring chamber (5) for measuring, a temperature control assembly for adjusting the temperature in the measuring chamber (5), a humidity control assembly for adjusting the humidity in the measuring chamber (5), a pressure sensor (8) for acquiring the quality of spherical fruits, a temperature and humidity integrated sensor (10) for acquiring the temperature and the humidity in the measuring chamber (5) and a control assembly;
the control assembly is electrically connected with the temperature and humidity integrated sensor (10) and is used for collecting the temperature and the humidity in the measuring chamber (5);
the control assembly is electrically connected with the pressure sensor (8) and the temperature control assembly respectively and is used for acquiring data of the pressure sensor (8), obtaining the mass loss rate of the spherical fruits according to the mass data, comparing the obtained mass loss rate with a set mass loss rate value range, and controlling the temperature control assembly according to a comparison result to adjust the temperature and the humidity in the measuring chamber;
the control assembly comprises a display (12) and a main control unit (13);
the display (12) is electrically connected with the main control unit (13) and is used for displaying temperature and humidity data collected by the main control unit (13) and the quality loss rate of spherical fruits arranged in the measuring chamber (5);
wherein, the main control unit (13) comprises a singlechip system and a data acquisition instrument (14); the data acquisition instrument (14) acquires data of the pressure sensor (8) and the temperature and humidity integrated sensor (10) and transmits the data to the single chip microcomputer system.
2. The apparatus of claim 1, wherein: the measuring chamber (5) is composed of an organic glass box body (6), and heat-insulating cotton is arranged on the outer side of the organic glass box body (6).
3. The apparatus of claim 1, wherein: the temperature control assembly comprises a refrigeration unit for adjusting the inside of the measuring chamber (5) and an L-shaped baffle (9A) arranged above the pressure sensor (8);
wherein the L-shaped baffle (9A) is inverted in the measuring chamber (5), and the short side of the L-shaped baffle (9A) is connected with the bottom surface of the measuring chamber (5), so that the outer side surface of the long side of the L-shaped baffle (9A) and the measuring chamber (5) form an air return channel (9); a hot air outlet (5A) is arranged on the bottom surface of the measuring chamber (5);
wherein, the pressure sensor (8) and the temperature and humidity integrated sensor (10) are arranged between the inner side surface of the long side of the L-shaped baffle (9A) and the bottom surface of the measuring chamber (5).
4. The apparatus of claim 1, wherein: the humidity control assembly comprises a container (11) for controlling humidity, and an evaporation solution is arranged in the container (11).
5. The apparatus of claim 1, wherein: the wind speed measuring device also comprises an anemometer (7) arranged in the measuring chamber (5); the anemometer (7) is electrically connected with the control component.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910381242.2A CN110261257B (en) | 2019-05-08 | 2019-05-08 | Method and device for judging precooling effect of spherical fruits |
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| CN201910381242.2A CN110261257B (en) | 2019-05-08 | 2019-05-08 | Method and device for judging precooling effect of spherical fruits |
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| CN110261257B true CN110261257B (en) | 2022-03-11 |
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