CN115644234A - Low-voltage electrostatic field combined with vacuum thawing device and method - Google Patents

Abstract

A low-voltage electrostatic field combined vacuum thawing device, which uses a vacuum sensor and a humidity sensor to monitor the vacuum and humidity in the thawing chamber respectively, and generates the corresponding current vacuum value and current humidity value; the thawing control device judges the current vacuum degree When the value corresponds to the preset reference vacuum value, control the vacuum pump device to maintain work, and also control the humidifier to work so that the current humidity value in the thawing chamber corresponds to the preset reference humidity value and control the low-voltage static electricity The generator starts to work; when the thawing control device judges that the current temperature value of the frozen meat provided by the ultrasonic temperature measurement system corresponds to the pre-stored reference temperature value, it controls the low-voltage electrostatic generator to stop working, and controls the vacuum regulating valve to work so that the thawing chamber The internal pressure returns to normal pressure, so the use of low-voltage electrostatic field can destroy the steady-state structure of water and form ion wind to accelerate thawing. The present application also provides a low-voltage electrostatic field combined vacuum thawing method.

Description

Low-voltage electrostatic field combined with vacuum thawing device and method

technical field

The invention relates to the technical field of meat thawing, in particular to a low-voltage electrostatic field combined vacuum thawing device and method.

Background technique

Meat food can provide human beings with rich and necessary nutrients, such as protein, fat and minerals. However, these nutrients also provide excellent growth substrates for endogenous enzymes and spoilage microorganisms during storage and processing, and the quality and safety of meat foods are greatly affected. Freezing is one of the most common methods used to extend the shelf life of meat products by inhibiting microbial growth and spoilage. Therefore, meat products are usually frozen for storage, transportation and sale. Thawing becomes a necessary and critical step before frozen meat enters subsequent processing and cooking treatments. However, quality loss inevitably occurs during the thawing process, including color deterioration, decreased water retention capacity, texture changes, and protein denaturation, among others. The quality of thawed meat may be affected by many factors, such as animal species, slaughtering and processing methods, freezing and thawing, and special attention should be paid to the thawing method.

Traditional meat thawing is carried out in air and water. In addition to being time consuming, such methods often lead to severe loss of meat quality. In addition, other new thawing methods, such as ultra-high pressure, microwave, and ultrasound, have also been widely studied and applied to thawing. Although these methods can effectively shorten the thawing time, there are many disadvantages. Ultra-high pressure thawing has a great impact on muscle tissue, because high pressure can easily cause protein denaturation and tissue structural damage, and high pressure has extremely high requirements on equipment, and the cost is expensive; The absorption speed of the microwave varies, resulting in uneven heating, and the meat in some areas is completely thawed, while other parts remain frozen, and the penetration of microwaves is weak due to the frequency, and deep thawing cannot be performed for large-volume frozen meat. ; The power consumption of ultrasonic thawing is high, the equipment is expensive, and it is difficult to carry out large-scale application in industry.

Contents of the invention

In view of this, the invention discloses a low-voltage electrostatic field combined vacuum thawing device with high thawing efficiency and reduced meat quality loss.

There is also provided a low-voltage electrostatic field combined vacuum thawing method with high thawing efficiency and reduced meat quality loss.

A low-voltage electrostatic field combined vacuum thawing device, including a box door, a box body, a humidifier, an ultrasonic probe, a vacuum regulating valve, a vacuum sensor, a humidity sensor, a low-voltage electrostatic field plate, a thawing control device, a low-voltage electrostatic generator, an ultrasonic A temperature measurement system; the box has a disconnected thawing chamber and an electrical chamber;

The thawing chamber is provided with a humidifier, an ultrasonic probe, a vacuum sensor, a humidity sensor, a vacuum regulating valve, and a low-voltage electrostatic field plate; two opposite inner walls of the thawing chamber are respectively provided with a low-voltage electrostatic field plate; The thawing chamber is connected with a vacuum pump device through a pipeline;

A thawing control device, a low-voltage electrostatic generator, and an ultrasonic temperature measurement system are installed in the right electric cavity, and the thawing control device, a low-voltage electrostatic generator, an ultrasonic temperature measurement system, a vacuum sensor, a humidity sensor, a vacuum regulating valve, and a humidifier electric The low-voltage electrostatic generator is also electrically connected to the low-voltage electrostatic field plate, and the ultrasonic temperature measurement system is electrically connected to the ultrasonic probe;

The low-voltage electrostatic generator is used to form a symmetrical low-voltage electrostatic field with relatively consistent electric field strength between the two low-voltage electrostatic field plates, and ensure that the low-voltage electrostatic field completely covers the frozen meat to be thawed, and makes the two low-voltage electrostatic fields Corona wind is generated between the field plates;

The ultrasonic probe is used to transmit the monitored temperature signal of frozen meat to the ultrasonic temperature measurement system in real time. The ultrasonic temperature measurement system generates the corresponding current temperature value of frozen meat according to the temperature signal of frozen meat, and provides the current temperature value of frozen meat to the thawing control device The vacuum degree sensor and the humidity sensor monitor the vacuum degree and humidity in the thawing chamber respectively, and generate corresponding current vacuum degree value and current humidity value, and provide the current vacuum degree value and current humidity value to the thawing control device;

The thawing control device responds to the startup operation, controls the vacuum pump device to start working, and when it is judged that the current vacuum value corresponds to the preset reference vacuum value, controls the vacuum pump device to maintain work so that the current vacuum value is consistent with the preset reference vacuum value. Corresponding to the degree value;

When the thawing control device judges that the current vacuum value corresponds to the preset reference vacuum value, it also controls the humidifier to work so that the current humidity value in the thawing chamber corresponds to the preset reference humidity value, and the thawing control When the device determines that the current humidity value corresponds to the preset reference humidity value, it also controls the low-voltage electrostatic generator to start working; when the thawing control device determines that the current temperature value of the frozen meat corresponds to the pre-stored reference temperature value, it controls The low-voltage electrostatic generator stops working, and controls the vacuum regulating valve to work so that the pressure in the thawing chamber returns to normal pressure.

A low-voltage electrostatic field combined vacuum thawing method, the method is applied to the above-mentioned low-voltage electrostatic field combined vacuum thawing device, comprising the following steps:

Put frozen meat products in the thawing cavity of the box and close the door;

Use the vacuum degree sensor and the humidity sensor to monitor the vacuum degree and humidity in the thawing chamber respectively, and generate the corresponding current vacuum degree value and current humidity value;

In response to the start-up operation, the thawing control device controls the vacuum pump device to start working, and when it is judged that the current vacuum degree value corresponds to the preset reference vacuum degree value, controls the vacuum pump device to maintain operation so that the current vacuum degree value is consistent with the preset reference vacuum degree value. Corresponding to the degree value;

When the thawing control device judges that the current vacuum value corresponds to the preset reference vacuum value, it also controls the operation of the humidifier so that the current humidity value in the thawing chamber corresponds to the preset reference humidity value;

After judging that the current humidity value corresponds to the preset reference humidity value, the thawing control device also controls the low-voltage electrostatic generator to start working;

Use an ultrasonic probe to monitor the temperature of frozen meat and generate a corresponding frozen meat temperature signal;

Use the ultrasonic temperature measurement system to generate the corresponding current temperature value of the frozen meat according to the temperature signal of the frozen meat;

When the thawing control device determines that the current temperature of the frozen meat corresponds to the pre-stored reference temperature, it controls the low-voltage electrostatic generator to stop working, and controls the vacuum regulating valve to restore the pressure in the thawing chamber to normal pressure.

In the above-mentioned low-voltage electrostatic field combined vacuum thawing device and method, the vacuum degree and humidity in the thawing chamber are monitored respectively by using the vacuum degree sensor and the humidity sensor, and the corresponding current vacuum degree value and current humidity value are generated; the thawing control device controls the vacuum pump device to start When judging that the current vacuum value corresponds to the preset reference vacuum value, control the vacuum pump device to maintain work so that the current vacuum value corresponds to the preset reference vacuum value; When the current vacuum value corresponds to the preset reference vacuum value, the humidifier is also controlled to work so that the current humidity value in the thawing chamber corresponds to the preset reference humidity value; the thawing control device determines the current humidity The value corresponds to the preset reference humidity value, and also controls the low-voltage electrostatic generator to start working; uses the ultrasonic probe and the ultrasonic temperature measurement system to obtain the current temperature value of the frozen meat in the thawing chamber; When the current temperature value of the meat corresponds to the pre-stored reference temperature value, control the low-voltage electrostatic generator to stop working, and control the vacuum regulating valve to work so that the pressure in the thawing chamber returns to normal pressure, so that the low-voltage electrostatic field can destroy the water. Steady-state structure and the formation of ion wind to accelerate thawing. During this process, the vacuum pump device keeps the vacuum in the thawing chamber within the reference vacuum value, so as to alleviate the impact of charged ions produced by the ionized air of the low-voltage electrostatic field on the lipids of frozen meat. And the oxidation of protein, and maintain the quality of protein gel, at the same time by releasing latent heat to the surface of frozen meat, accelerate the speed of thawing, thereby shortening the thawing time.

Description of drawings

Fig. 1 is a schematic structural diagram of a low-voltage electrostatic field combined vacuum thawing device in a preferred embodiment.

Fig. 2 is a schematic flow chart of the low-voltage electrostatic field combined with vacuum thawing method.

In the figure: low-voltage electrostatic field combined vacuum thawing device 100, box door 101, box body 102, thawing chamber 1021, electrical chamber 1022, stage 1023, thawing waste liquid collection tray 1024, humidifier 103, ultrasonic probe 104, vacuum regulator Valve 105, vacuum degree sensor 106, humidity sensor 107, low-voltage electrostatic field plate 108, thawing control device 109, low-voltage electrostatic generator 110, ultrasonic temperature measurement system 111, vacuum pump device 112, step S100 of the low-voltage electrostatic field combined vacuum thawing method Go to step S107.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

As shown in Figure 1, a low-voltage electrostatic field combined vacuum thawing device 100 provided by the present application includes a box door 101, a box body 102, a humidifier 103, an ultrasonic probe 104, a vacuum regulating valve 105, a vacuum sensor 106, and a humidity sensor 107 , a low-voltage electrostatic field plate 108, a thawing control device 109 with data processing functions, a low-voltage electrostatic generator 110, an ultrasonic temperature measurement system 111, and a vacuum pump device 112; ;

A humidifier 103, an ultrasonic probe 104, a vacuum regulating valve 105, a vacuum sensor 106, a humidity sensor 107, a vacuum regulating valve 105, and a low-voltage electrostatic field plate 108 are arranged in the thawing chamber 1021; A low-voltage electrostatic field plate 108 is arranged on each of the two inner walls; the thawing chamber 1021 is connected to the vacuum pump device 112 through a pipeline.

The thawing control device 109, low-voltage electrostatic generator 110, ultrasonic temperature measurement system 111 are set in the right electrical chamber 1022, and the thawing control device 109, low-voltage electrostatic generator 110, ultrasonic temperature measurement system 111, vacuum degree sensor 106, humidity sensor 107. The vacuum regulating valve 105 is electrically connected to the humidifier 103, the low-voltage electrostatic generator 110 is also electrically connected to the low-voltage electrostatic field plate 108, and the ultrasonic temperature measurement system 111 is electrically connected to the ultrasonic probe 104.

The low-voltage electrostatic generator 110 is used to form a symmetrical and relatively consistent low-voltage electrostatic field between the two low-voltage electrostatic field plates 108, and to ensure that the low-voltage electrostatic field will completely cover the frozen meat to be thawed, and make the two Corona wind is generated between the low-voltage electrostatic field pole plates 108. The two low-voltage electrostatic field plates 108 arranged oppositely ensure the uniformity and consistency of the electric field around the frozen meat, so that the corona wind generated by the two low-voltage electrostatic field plates 108 can collide relatively stably, and then drive the air in the air. Scattered charged particles contact with more air to form new charged particles, increase the contact probability and contact time between charged particles and ice crystals in frozen meat, and then ensure the heat required for thawing, thereby improving thawing efficiency and thawing Uniformity.

The ultrasonic probe 104 is used to transmit the monitored frozen meat temperature signal to the ultrasonic temperature measurement system 111 in real time, and the ultrasonic temperature measurement system 111 generates a corresponding frozen meat current temperature value according to the frozen meat temperature signal, and provides the frozen meat current temperature value to Thawing control device 109; the vacuum degree sensor 106 and the humidity sensor 107 monitor the vacuum degree and humidity in the thawing chamber respectively, and generate corresponding current vacuum degree value and current humidity value, and provide the current vacuum degree value and current humidity value To the thawing control device 109;

The thawing control device 109 responds to the start operation, controls the vacuum pump device 112 to start working, and when it is judged that the current vacuum degree value corresponds to the preset reference vacuum degree value, controls the vacuum pump device 112 to maintain work so that the current vacuum degree value is consistent with the preset reference vacuum degree value. Corresponding to the reference vacuum value;

When the thawing control device 109 judges that the current vacuum value corresponds to the preset reference vacuum value, it also controls the operation of the humidifier 103 so that the current humidity value in the thawing chamber 1021 corresponds to the preset reference humidity value The thawing control device 109 also controls the low-voltage electrostatic generator 110 to start working after judging that the current humidity value corresponds to the preset reference humidity value; When the value is corresponding, the low-voltage electrostatic generator 110 is controlled to stop working, and the vacuum regulating valve 105 is controlled to work so that the pressure in the thawing chamber returns to normal pressure.

Wherein, an object stage 1023 and a thawing waste liquid collection tray 1024 are arranged in the thawing chamber 1021 , and the thawing waste liquid collection tray 1024 is located below the object stage 1023 . The ultrasonic probe 104 is set in the thawing chamber 1021 at the top middle of the stage 1023. The accuracy of the ultrasonic temperature measurement system is within 1°C, and the resolution reaches 0.001°C. Cut surface temperature characteristics. The ultrasonic temperature measurement system 111 and the ultrasonic probe 104 are used to monitor the temperature change during the thawing process. First, no drilling is required to obtain channels, and the temperature field distribution of the frozen meat will not be damaged; second, the geometric center of the frozen meat can be accurately obtained. The temperature ensures the accuracy of judging the completion of thawing of frozen meat.

Wherein, the humidifier 103 is installed on the top of the thawing chamber 1021, and the range of the reference humidity value is 80%-85%; the reference vacuum value is 2000Pa; the reference temperature value is 4°C; The field plate 108 is a zinc alloy with a size of W260mm×D170mm×H7mm, and the distance between the two plates is 30-40cm; the low-voltage electrostatic generator 110 outputs a direct current of 2500V and 0.2mA, so that the two low-voltage electrostatic generators Corona wind is produced between the field plates 108, the box body 102 is insulated, and the shell is grounded; a vacuum regulating valve 105 is also arranged on the pipeline, and two vacuum regulating valves 105 are opened simultaneously to shorten the temperature in the thawing chamber. The time required for the pressure to return to normal pressure.

In this embodiment, the above-mentioned thawing control device 109 is a microcomputer, and the thawing control device 109 includes a central processing unit, a memory, an input and output interface circuit and a bus hardware structure, and the memory may store operating systems, network communication programs, and user interface programs. And frozen meat thawing control program. The operating system is a program that manages and controls the hardware and software resources of the device, and supports the operation of the frozen meat thawing control program and other software or programs. After the central processing unit in the thawing control device 109 runs the frozen meat thawing control program stored in the memory, it produces the following functional modules:

A starting unit, used to control the vacuum pump device 112 to start working in response to the starting operation;

The vacuum degree judging unit, when judging that the current vacuum degree value corresponds to the preset reference vacuum degree value, outputs a first execution command to the vacuum degree maintaining unit and the humidity control unit;

The vacuum maintenance unit controls the vacuum pump device 112 to keep working in response to the first execution command, so that the current vacuum value corresponds to the preset reference vacuum value;

The humidity control unit, in response to the first execution command, also controls the humidifier 103 to work so that the current humidity value in the thawing chamber 1021 corresponds to the preset reference humidity value, and the humidity control unit is also used to determine the current humidity value Corresponding to the preset reference humidity value, output a second control command to the low-voltage electrostatic generator, and the low-voltage electrostatic generator 110 starts working in response to the second control command;

The thawing judging unit is used to receive the current temperature value of the frozen meat provided by the ultrasonic temperature measuring system 111, and output a third control command to the low-voltage electrostatic generator when it is judged that the current temperature value of the frozen meat corresponds to the pre-stored reference temperature value 110. The vacuum degree maintaining unit and the vacuum regulating valve 105; the low-voltage electrostatic generator 110 responds to the third control command and stops working; the vacuum degree maintaining unit responds to the third control command and controls the vacuum pump device 112 to stop working, so The vacuum regulating valve 105 responds to the third control command, and the vacuum regulating valve 105 is opened to restore the pressure in the thawing chamber to normal pressure.

Further, please refer to Fig. 2 at the same time, the present application also provides a low-voltage electrostatic field combined vacuum thawing method, which is applied to the above-mentioned low-voltage electrostatic field combined vacuum thawing device, including the following steps:

Step S100, placing frozen meat products in the thawing cavity of the box and closing the box door;

Step S101, using the vacuum degree sensor and the humidity sensor to monitor the vacuum degree and humidity in the thawing chamber respectively, and generating the corresponding current vacuum degree value and current humidity value;

Step S102, in response to the start-up operation, the thawing control device controls the vacuum pump device to start working, and when it is judged that the current vacuum degree value corresponds to the preset reference vacuum degree value, controls the vacuum pump device to maintain work so that the current vacuum degree value is consistent with the preset reference vacuum degree value. Corresponding to the benchmark vacuum value; the benchmark vacuum value is 2000Pa;

Step S103, when the thawing control device determines that the current vacuum value corresponds to the preset reference vacuum value, it also controls the operation of the humidifier so that the current humidity value in the thawing chamber corresponds to the preset reference humidity value , the range of the reference humidity value is 80%-85%;

Step S104, after judging that the current humidity value corresponds to the preset reference humidity value, the thawing control device also controls the low-voltage electrostatic generator to start working;

Step S105, using the ultrasonic probe to monitor the temperature of the frozen meat, and generating a corresponding frozen meat temperature signal;

Step S106, using the ultrasonic temperature measurement system to generate the corresponding current temperature value of the frozen meat according to the temperature signal of the frozen meat;

Step S107, when the thawing control device judges that the current temperature value of the frozen meat corresponds to the pre-stored reference temperature value, control the low-voltage electrostatic generator to stop working, and control the vacuum regulating valve to work so that the pressure in the thawing chamber returns to normal. pressure, the reference temperature value is 4°C.

For ease of understanding, the following is an example to illustrate the technical solution of the present application: take the hind leg of a lamb matured for 24 hours after slaughter as raw material, divide it into meat pieces of 4cm×4cm×3cm weighing about 50±2g, and place them in a -18°C refrigerator for freezing 24 hours.

Take out the frozen mutton pieces, put them on the stage in the thawing chamber, and close the door;

The operator turns on the power supply, and the vacuum degree in the thawing chamber preset in the above-mentioned thawing control device is 2000Pa, and the humidity range is 80%-85%;

The thawing control device controls the vacuum pump device to start working so that the vacuum degree in the thawing chamber is continuously maintained at 2000Pa; the thawing control device controls the humidifier to start working, and the humidity in the thawing chamber rises. When it is 85%, control the humidifier to stop working to prevent condensation. When it is judged that the humidity in the thawing chamber is lower than 80%, control the humidifier 103 to work immediately to increase humidity to prevent dry consumption in the electric field;

When the thawing control device judges that the humidity in the thawing chamber is between 80% and 85%, it controls the low-voltage electrostatic generator to work so that the low-voltage electrostatic generator can generate 2500V, 0.2mA direct current between the low-voltage electrostatic field plates. Form an electric field with a symmetrical arc-shaped distribution and a relatively consistent intensity;

When the thawing control device judges that the current temperature value of the frozen meat corresponds to the pre-stored reference temperature value, it indicates that the thawing is over, controls the vacuum pump device to stop working and the vacuum regulating valve to open, and takes out the meat piece after the thawing chamber returns to normal pressure.

The thawing speed of the mutton processed by the technical scheme of the present application is 1.85 times and 1.54 times that of using low-voltage electrostatic field and vacuum thawing alone; The thawing loss of the treatment was 4.71% and 4.05% respectively; the carbonyl content of the mutton sample treated by this method was the lowest (3.65mmol/mg), which was not significantly different from that of fresh meat (3.45mmol/mg) (P<0.05). The carbonyl content of the samples after low-voltage electrostatic field and vacuum thawing were 4.4mmol/mg and 4.3mmol/mg respectively; the total sulfhydryl content of the mutton samples treated by the technical scheme of the present application was reduced by 2.8% compared with the fresh sample, corresponding to The total thiol content of samples using low-voltage electrostatic field and vacuum thawing alone decreased by 8.2% and 6.1%, respectively. In summary, this method has the shortest thawing time, inhibits protein oxidative denaturation, and reduces juice loss.

Claims (7)

1. The utility model provides a vacuum thawing apparatus is united to low pressure electrostatic field, includes chamber door, box, its characterized in that: the device also comprises a humidifier, an ultrasonic probe, a vacuum regulating valve, a vacuum degree sensor, a humidity sensor, a low-voltage electrostatic field polar plate, a thawing control device, a low-voltage electrostatic generator and an ultrasonic temperature measuring system; the box body is provided with a unfreezing cavity and an electric cavity which are not communicated;

a humidifier, an ultrasonic probe, a vacuum degree sensor, a humidity sensor, a vacuum regulating valve and a low-voltage electrostatic field polar plate are arranged in the unfreezing cavity; two opposite inner walls of the unfreezing cavity are respectively provided with a low-voltage electrostatic field polar plate; the thawing cavity is connected with a vacuum pump device through a pipeline;

a thawing control device, a low-voltage electrostatic generator and an ultrasonic temperature measuring system are arranged in the right-side electric cavity, the thawing control device is electrically connected with the low-voltage electrostatic generator, the ultrasonic temperature measuring system, the vacuum degree sensor, the humidity sensor, the vacuum regulating valve and the humidifier, the low-voltage electrostatic generator is also electrically connected with the low-voltage electrostatic field pole plate, and the ultrasonic temperature measuring system is electrically connected with the ultrasonic probe;

the low-voltage electrostatic generator is used for forming a symmetrical low-voltage electrostatic field with relatively consistent electric field intensity between the two low-voltage electrostatic field polar plates, ensuring that the low-voltage electrostatic field completely covers meat to be thawed and generating corona wind between the two low-voltage electrostatic field polar plates;

the ultrasonic probe is used for transmitting the monitored frozen meat temperature signal to the ultrasonic temperature measuring system in real time, and the ultrasonic temperature measuring system generates a corresponding frozen meat current temperature value according to the frozen meat temperature signal and provides the frozen meat current temperature value to the unfreezing control device; the vacuum degree sensor and the humidity sensor respectively monitor the vacuum degree and the humidity in the thawing cavity, generate corresponding current vacuum degree value and current humidity value, and provide the current vacuum degree value and the current humidity value for the thawing control device;

the unfreezing control device responds to the starting operation, controls the vacuum pump device to start working, and controls the vacuum pump device to maintain working when judging that the current vacuum value corresponds to the preset reference vacuum value, so that the current vacuum value corresponds to the preset reference vacuum value;

when judging that the current vacuum value corresponds to a preset reference vacuum value, the unfreezing control device also controls the humidifier to work so that the current humidity value in the unfreezing cavity corresponds to the preset reference humidity value, and when judging that the current humidity value corresponds to the preset reference humidity value, the unfreezing control device also controls the low-voltage electrostatic generator to start working; and when judging that the current temperature value of the frozen meat corresponds to the pre-stored reference temperature value, the thawing control device controls the low-voltage electrostatic generator to stop working and controls the vacuum regulating valve to work so as to recover the pressure in the thawing cavity to normal pressure.

2. The low-voltage electrostatic field combined vacuum thawing device according to claim 1, characterized in that: the intracavity that unfreezes is provided with the objective table and unfreezes the waste liquid catch tray, and the waste liquid catch tray that unfreezes is located the below of objective table.

3. The low-voltage electrostatic field combined vacuum thawing device according to claim 2, characterized in that:

the ultrasonic probe is arranged in the middle of the upper side of the thawing cavity, which is opposite to the objective table, the precision of the ultrasonic temperature measurement system is within 1 ℃, the resolution reaches 0.001 ℃, and the section temperature characteristic of the frozen meat is inverted through a two-dimensional field reconstruction algorithm.

4. The low-voltage electrostatic field combined vacuum thawing device according to claim 1, characterized in that: the humidifier is arranged at the top of the unfreezing cavity, and the range of the reference humidity value is 80% -85%; the reference vacuum degree value is 2000Pa; the reference temperature value was 4 ℃.

5. The low-voltage electrostatic field combined vacuum thawing device according to claim 1, characterized in that: the low-voltage electrostatic field polar plate is made of zinc alloy, the size of the low-voltage electrostatic field polar plate is W260mm multiplied by D170mm multiplied by H7mm, and the distance between the two polar plates is 30-40 cm; the low-voltage electrostatic generator outputs direct current of 2500V and 0.2mA so as to generate corona wind between the two low-voltage electrostatic field polar plates.

6. The low-voltage electrostatic field combined vacuum thawing device according to claim 1, characterized in that: the box body is insulated, and the shell is grounded; the pipeline is also provided with the vacuum regulating valve.

7. A low-voltage electrostatic field combined vacuum unfreezing method is applied to the low-voltage electrostatic field combined vacuum unfreezing device of any one of claims 1 to 6 and comprises the following steps:

putting the frozen meat product into a thawing cavity of the box body and closing a box door;

respectively monitoring the vacuum degree and the humidity in the thawing cavity by using a vacuum degree sensor and a humidity sensor, and generating a corresponding current vacuum degree value and a current humidity value;

responding to the starting operation, controlling the vacuum pump device to start working by the unfreezing control device, and controlling the vacuum pump device to maintain working when the current vacuum value is judged to correspond to the preset reference vacuum value so as to enable the current vacuum value to correspond to the preset reference vacuum value;

when the thawing control device judges that the current vacuum value corresponds to a preset reference vacuum value, the thawing control device also controls the humidifier to work so that the current humidity value in the thawing cavity corresponds to the preset reference humidity value;

the unfreezing control device also controls the low-voltage electrostatic generator to start working after judging that the current humidity value corresponds to a preset reference humidity value;

monitoring the temperature of the frozen meat by using an ultrasonic probe, and generating a corresponding frozen meat temperature signal;

generating a corresponding frozen meat current temperature value according to the frozen meat temperature signal by using an ultrasonic temperature measurement system;

and when judging that the current temperature value of the frozen meat corresponds to the pre-stored reference temperature value, the thawing control device controls the low-voltage electrostatic generator to stop working and controls the vacuum regulating valve to work so as to recover the pressure in the thawing cavity to normal pressure.

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