433MHz heating chamber and solid source industrial thawing equipment

Abstract

The present invention relates to a microwave thawing device, and in particular to a 433MHz heating cavity body and solid-state source industrial thawing equipment. It includes a material conveying device, a metal detector, a microwave processing module, and a motor placed on a frame; a microwave source is respectively provided on the upper and bottom of the microwave processor, the microwave source is connected to the bell mouth through a waveguide, and the two bell mouths are connected to the heating cavity through a microwave window; the microwave source is a 433MHz solid-state microwave source; a reflecting surface adjustment device is provided on the side of the heating cavity, including an inner plate, a screw rod and a scissor mechanism, the screw rod passes through a metal plate, and the end is a handle. The present application uses a high-power density 433MHz microwave to penetrate meat products to ensure that the temperature is uniform inside and outside after thawing. It only takes 2-4 minutes from -18°C to -2°C. After thawing, the color and nutritional content are basically unchanged compared with fresh meat. Continuous production can minimize the reproduction of harmful bacteria. It is currently an advanced method for thawing meat products.

Description

Technical Field

[0001] The invention relates to a microwave thawing device, in particular to a 433MHz heating cavity body and solid source industrial thawing equipment. Background Art

[0002] Microwave thawing is to use the penetrating and selective heating characteristics of microwaves to quickly heat frozen products from -42 to -18 degrees Celsius to a non-drip state of -2 degrees Celsius. Microwave thawing is to use the high-frequency radiation of electromagnetic waves to generate heat from elastic collisions and friction between polar molecules and surrounding molecules. The heating method is generated from the inside of the product material. It has the advantages of low production cost, high efficiency, no bacterial growth in the product and small footprint, which is unmatched by other thawing methods.

[0003] Frozen meat is a good way to keep the quality of meat stable, but when thawing frozen meat, different thawing methods have a great impact on the quality of the thawed meat. Traditional thawing methods include air thawing and water thawing. During the thawing process, heat is transferred from the surface of the meat to the inside by heat transfer. This method not only takes a long time to thaw, but also has a high rate of meat juice loss during the thawing process, and is easily contaminated by microorganisms, which deteriorates the quality of the thawed meat. Therefore, it is considered to use microwave thawing to thaw meat, but most of the main thawing equipment in China is 915MHz and 2450MHz, which are inefficient and have shallow penetration depth of meat packages. Most of them need to be equipped with steam heating thawing function before and after thawing, which is complicated and inconvenient to operate.

[0004] At present, how to achieve high-power, fast and uniform thawing of large, irregularly shaped and different types of food is a technical problem. The existing 915MHz and 2450MHz microwave thawing equipment has low penetration depth, poor uniformity and repeatability, and the cavity design size suitable for 915MHz and 2450MHz is small, and it is not possible to simply enlarge the size proportionally to achieve industrial enlargement. The 433MHz cavity design itself is industrial-level in size, and can meet the requirements of industrial production without industrial enlargement. Summary of the invention

[0005] The technical problem solved by the present invention is the uniformity of thawing. The uniformity of existing equipment has great problems. The uniformity can meet the requirements at low power, but when the microwave power is increased industrially, the rate at which the heated food absorbs microwaves is proportional to the square of the electric field. The increase in power will sharply amplify the uneven heating, resulting in a huge difference in hot and cold spots, leading to the deterioration of the quality of the thawed product. However, many patented equipment can only achieve microwave thawing. For the uniformity of heating and the distribution of the electric field, the heating cavity is not designed, and the problem of uneven thawing cannot be fundamentally solved.

[0006] For example, patent 201810594541 "A high-power industrial microwave thawing device" has the following defects:

[0007] (1) The equipment uses a rotating wave, which is the same as the flat microwave oven in the kitchen. It only increases the disorder of the electric field in probability to improve the uniformity of heating, but cannot fundamentally solve the problems of heating uniformity and overheating effect in corners.

[0008] (2) It is impossible to adjust the design of the heating chamber according to different samples to be thawed. The wave transfer technology increases the degree of disorder of the electric field, and the electric field distribution is unstable and has poor repeatability. It is impossible to make targeted designs for products to be thawed of different types, shapes, and sizes.

[0009] Patent 201811443594 "A device and method for microwave thawing pork" has the following defects: the patent is designed to be used only for thawing pork, and cannot be designed specifically for products to be thawed of different types, shapes and sizes; the pork used in its instrument is 5*5*10CM (212.5g), which is too small and not suitable for industrial thawing.

[0010] To solve the above problems, the present application provides a 433MHz heating chamber and solid source industrial thawing equipment, which can penetrate meat products with high power density 433MHz microwaves to ensure uniform temperature inside and outside after thawing. It only takes 2-4 minutes to reduce the temperature from -18°C to -2°C. The color and nutritional content of meat after thawing are basically unchanged compared with fresh meat. Continuous production can minimize the reproduction of harmful bacteria, which is the most advanced method for thawing meat products.

[0011] To achieve the above-mentioned object, the present application is implemented through the following technical solutions: a 433MHz heating chamber body and solid source industrial thawing equipment, including a material conveying device placed on a frame, a metal detector, a microwave processing module, and a motor;

[0012] The motor is connected to the material conveying device through a line to provide power for it; the material conveying device is a conveying device made of non-metallic material, passes through the microwave processing module, and runs from the metal detector to the rear end;

[0013] The metal detector is set on the side of the feeding end of the conveyor belt to screen out materials containing metal at the feeding port to prevent metal substances from entering the microwave processing module. If a small metal enters, microwaves will enter from around the metal. The temperature of the area around the metal is too high, the temperature difference is large, and the quality is deteriorated; large metal will cause microwave shielding and cannot be thawed; behind the metal detector is the microwave processing module, which includes two or more microwave processors connected in sequence, which can be optimized and combined according to different needs to obtain better heating uniformity;

[0014] The upper and lower parts of the microwave processor are provided with a microwave source, which is connected to the horn through a waveguide. The horn is used to evenly disperse the microwave. It can be designed in advance according to the type and size of the thawed product, and the components can be replaced later as needed to ensure the uniformity of heating. The upper and lower horns are connected to the heating cavity through a microwave window, and the microwave enters the heating cavity through the microwave window. The microwave window can also prevent water vapor and dust from entering the instrument; the microwave enters a heating cavity composed of six walls, and the simple four-dimensional equation system has only one solution for single mode, and multiple solutions for multi-mode. The single-mode design of this application is that the standing wave mode is a standing wave, with stable cold spots and hot spots, good electric field stability, and stable temperature distribution; Nanjing Sanle adopts the rotation wave mode because it adopts multi-mode, the electric field is always in a disordered state, the electric field stability is poor, and it is unstable. It is impossible to determine where the hot spot is and where the cold spot is when the electric field chaos is increased to what degree and how to increase to a sufficient degree of chaos; rotation can improve uniformity, but it is impossible to determine to what extent it can be improved, and there is no relevant research. When the power is amplified, what is the hot spot and what is the hot spot. This time it's hot in one place, next time it's very hot in another place. It's unstable and not repeatable.In the case of multi-mode, it is more difficult to determine the hot and cold spots when changing products; the microwave source is a 433MHz solid-state microwave source. For samples to be thawed of the same volume, shape, size and type, 433MHz has a longer wavelength, a greater penetration depth and a better penetration effect. In addition, 433MHz has fewer standing waves and a large distance between cold and hot spots. The uniformity problem can be solved by thermal type complementarity, while 915MHz and 2450MHz are point-hot and point-cold, and rely on cold and hot spots to transfer heat, and it is impossible to determine where the actual hot and cold spots are; compared with 915MHz and 2450MHz, there are dozens of cold spots and hot spots, and the edge heating effect caused by more points is more obvious, while 433MHz may only have one or two, which is more conducive to the use of thermal type distribution for electric field complementarity design; and because the 433MHz magnetron needs to form a microwave with a wavelength of 669mm-717mm, the magnetron also needs an oscillation cavity. The volume required for the oscillation cavity to generate such a long microwave is very large, so its addition The size of the heat cavity is originally industrial-level, and it can meet the requirements of industrial production without industrial amplification. On the other hand, the use of a solid-state source can greatly reduce the size of the magnetron and power supply, and at the same time it has the characteristics of high controllability, small size, high frequency stability, and real-time feedback and adjustment of the frequency, power (forward / reverse), phase, etc. during equipment operation to improve heating uniformity. A reflective surface adjustment device is provided on the side of the heating cavity, including an inner plate, a screw rod and a scissor mechanism made of metal material. The two ends of the scissor mechanism are fixedly connected to the inner plate and the metal plate on the side of the heating cavity respectively. The screw rod passes through the metal plate and has a handle at the end. The length of the screw rod in the heating cavity is adjusted by turning the handle, thereby adjusting the position of the inner plate and realizing the adjustment of the width of the heating cavity, thereby adjusting the electric field distribution according to actual conditions to ensure heating uniformity. The 433MHz wavelength is very long, and the screw rod and the hole are in contact with each other without gaps, which can prevent microwaves from leaking out.

[0015] Furthermore, the material conveying device includes gears on both sides of the frame, a chain conveyor belt installed on the gears, the chain conveyor belt is made of non-metallic material, and a non-metallic support is provided at the bottom of the conveyor belt.

[0016] Furthermore, an infrared temperature measuring instrument is provided at the discharge end of the material conveying device, which can measure the surface temperature of the sample in real time and monitor the thawing condition.

[0017] Furthermore, the rack is also equipped with a control system, including a PLC and a touch screen connected to the PLC. The PLC controls the material conveying device, metal detector, microwave processing module, infrared temperature measuring instrument and motor through the line. The touch screen is used as the operating position to set operation, alarm, prompt and other instructions, establish a database of thawing material process packages, execute relevant processes according to different materials, and set automatic thawing when there is material and automatic standby when there is no material.

[0018] Furthermore, the microwave window is in the form of a flat plate or a solid cylindrical shape. Among them, the flat plate is a commonly used microwave window, which is easy to make, while the solid cylindrical shape can better focus the microwave; it can be replaced as needed before installation or after the equipment is disassembled to ensure uniform heating.

[0019] Furthermore, the height of the heating chamber is 30-60 cm and the width is 30 cm-60 cm, which is suitable for thawing various standard meat packages (30*60*20 cm) and meat and seafood of different shapes and sizes.

[0020] Furthermore, the front and rear ends of the microwave processing module are openings for the material conveying device to pass through. The inlet and outlet ends of the material conveying device are both provided with microwave suppressors, which include a reflective part and an absorbing part; the reflective part is usually an irregularly shaped metal, and the absorbing part is usually a graphene or silicon carbide plate, which is used to absorb the reflected microwaves. Any microwave suppressor currently sold on the market can be used. For specific structures, please refer to patents 201310631185.1 "Microwave suppressor and tunnel type microwave heating system" and 2018212792024 "An island type microwave suppressor". The test results show that the microwave leakage during the operation of the microwave in this application is generally 1-2.5mW / cm 2 .

[0021] Furthermore, the microwave power of the microwave processor is greater than or equal to 20KW.

[0022] Furthermore, the waveguide tube adopts the national standard BJ4, with a width of 533.4 and a height of 266.7 mm.

[0023] The device is applicable to thawing various standard meat packages (30*60*20cm) and meat and seafood of different shapes and sizes, and can quickly return the temperature of the materials to the temperature range of -4 to -2℃; including standard meat packages (30*60*20cm, with plastic packaging film): duck, quartered beef, ten-quartered beef, sextupled pork, mutton, etc.; irregular shaped and sized foods: lamb legs, whole chickens and ducks, livestock and poultry, etc.; aquatic products: fish slips, shrimp slips, fish paste, frozen shrimp, etc. Different horn sizes, microwave window sizes and types, and heating cavity widths can be designed according to different objects. When changing the thawing object, it is only necessary to replace the corresponding size of the components according to the object. The entire production line does not need to be rebuilt on a large scale, which greatly improves the flexibility of use and saves a lot of costs.

[0024] The thawing process is as follows: the material is placed on the food carrier, and the standard meat block or sample to be thawed is placed on the feeding end of the conveyor belt. After passing the metal detector inspection, the conveyor belt runs automatically. The material is then subjected to microwave treatment in the microwave heating cavity to reach the target thawing temperature. After the temperature is measured by an infrared temperature measuring instrument, the material is discharged from the discharging end to achieve rapid and lossless thawing.

[0025] The beneficial effects of the present invention are:

[0026] (1) The bell mouth has a symmetrical structure up and down, and a single-mode design (single-mode design means there is only one standing wave mode, good electric field stability, and stable temperature distribution). The microwave field is stable, and the thawing uniformity and repeatability are good. The heating cavity is modularly designed, and the electric field distribution is complementary. Compared with a single heating cavity, the uniformity and repeatability are better, and the phenomenon of external heat and internal cold will not occur.

[0027] (2) The cavity width and a series of changes can be made for different samples to obtain the optimal uniformity treatment solution for the material.

[0028] (3) Different meats have different dielectric properties (dielectric constant, dielectric loss, penetration depth) due to their different water content and other components, and their shapes and sizes are different. The heat type and energy distribution of different meats during microwave thawing are different. The present application can achieve the purpose of uniform thawing of different types of food by adjusting the size of the bell mouth, the width of the heating cavity, the size and shape of the microwave window, and the combination of microwave heating cavity modules.

[0029] For example, taking the same size of standard meat package and standard frozen shrimp package (20*30*60) as an example, the existing cavity size is suitable for thawing the standard frozen shrimp package, but for mutton, there are problems such as uneven energy distribution, large temperature difference between hot and cold spots, and insufficient penetration depth.

[0030] (4) Existing equipment can only adjust process parameters but cannot adjust the heating chamber according to different materials. The present application adopts a modular design of the heating chamber with complementary electric field distribution. A lifting device is also designed to change the width of the heating chamber to adjust the energy distribution, thereby achieving the purpose of uniformly thawing different materials.

[0031] (5) This equipment can heat 25 kg of meat from -25℃ to -2℃ in just 2-4 minutes. The penetration depth of 433MHz microwave is twice that of 915MHz and 6 times that of 2450MHz microwave, which is more energy-saving and environmentally friendly. The entire thawing process does not require a large site or a large amount of water, is pollution-free, energy-saving and environmentally friendly. Microwave thawing does not cause blood to flow out, is pollution-free, maintains the original color, and the meat loss rate is less than 1%, making the standard meat package thawed more evenly, without any changes in protein, color and other qualities, without destroying nutrients, and with little material loss.

[0032] (6) The present application adopts a microwave suppressor, which is connected on both sides, so the production process is unobstructed, continuous production can be achieved, and the safety protection function is improved, and microwave leakage will not occur.

[0033] (7) The 433MHz solid-state source occupies a small area, requires little investment, and can save costs.

[0034] (8) Microwave thawing is carried out in a stainless steel closed chamber. The box and conveyor belt can be safely rinsed. No water is required for thawing, no pollution is caused, and bacterial growth is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 It is a structural schematic diagram of the present invention.

[0037] Figure 2 It is a top view of the present invention.

[0038] Figure 3 It is a schematic diagram of the structure of a microwave processor.

[0039] Figure 4 It is a schematic diagram of the structure of a flat microwave window.

[0040] Figure 5 It is a structural schematic diagram of a solid cylindrical microwave window.

[0041] Figure 6 It is a structural schematic diagram of the reflecting surface adjustment device.

[0042] Figure 7 It is the electric field distribution diagram.

[0043] Figure 8 This is a schematic diagram of electric field complementarity (the shaded part is the cold spot, the other parts are the hot spots, and the greater the shadow density, the lower the temperature).

[0044] In the figure, a frame 1, a material conveying device 2, a gear 21, a chain conveyor belt 22, a metal detector 3, a microwave processor 4, a microwave source 41, a waveguide 42, a bell mouth 43, a microwave window 44, a heating chamber 45, an inner plate 451, a screw rod 452, a scissor mechanism 453, a handle 454, a metal plate 46, a motor 5, a control system 6, an infrared temperature measuring instrument 7, a heating chamber a, a heating chamber b, and a heat type c passing through the heating chamber a and the heating chamber b. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0046] Embodiment 1:

[0047] like Figure 1 and Figure 2 As shown, a 433MHz heating chamber and solid source industrial thawing equipment includes a material conveying device 2, a metal detector 3, a microwave processing module, and a motor 5 placed on a frame 1;

[0048] The motor 5 is connected to the material conveying device 2 through a line to provide power for it; the material conveying device 2 is a conveying device made of non-metallic material, passes through the microwave processing module, and runs from the metal detector 3 to the rear end;

[0049] The metal detector 3 is arranged at one side of the feeding end of the conveyor belt, and can detect materials containing metal. After the alarm, manual screening is performed to screen out the materials containing metal at the feeding port to prevent metal substances from entering the microwave processing module. If a small metal enters, microwaves will enter from around the metal, and the temperature of the area around the metal will be too high, the temperature difference will be large, and the quality will deteriorate; large metals will cause microwave shielding and cannot be thawed; the microwave processing module is located behind the metal detector, including two or more microwave processors 4 connected in sequence, which can be optimized and combined according to different needs to obtain better heating uniformity; the microwave heating cavity is modularly designed, that is, there are multiple microwave heating cavities, and different parameter settings can make the thermal type of each heating cavity different, so as to achieve a better heating uniformity. Figure 7 For example, the actual electric field distribution, when the material passes through the first heating chamber and the second heating chamber continuously, the heat type complementation effect can be achieved due to the different energy distribution. Figure 8 For example, if the energy of heating cavity a is concentrated in the middle, that is, the middle is the hot spot area, and the energy of heating cavity b is concentrated on the surroundings, after passing through two microwave heating cavities, the temperature difference between the hot and cold spots will be reduced, achieving better uniformity.

[0050] like Figure 3As shown, a microwave source 41 is provided at the top and bottom of the microwave processor 4, respectively. The microwave source 41 is connected to a bell mouth 43 through a waveguide 42. The bell mouth is used to evenly disperse microwaves. It can be designed in advance according to the type and size of the thawed product, and the components can be replaced later as needed to ensure the uniformity of heating. The upper and lower bell mouths are each connected to a central heating cavity 45 through a microwave window 44. The microwave enters the heating cavity through the microwave window. The microwave window can also prevent water vapor and dust from entering the instrument. The microwave source is a 433MHz solid-state microwave source. Figure 6 As shown, a reflecting surface adjustment device is provided on the side of the heating chamber, including an inner plate 451 made of metal, a screw rod 452 and a scissor mechanism 453. The two ends of the scissor mechanism 453 are respectively fixedly connected to the inner plate 451 and the metal plate 46 on the side of the heating chamber. The screw rod passes through the metal plate and has a handle 454 at the end. The length of the screw rod in the heating chamber is adjusted by turning the handle, thereby adjusting the position of the inner plate to adjust the width of the heating chamber, thereby adjusting the electric field distribution according to actual conditions to ensure uniform heating. The wavelength of 433MHz is very long, and the screw rod and the hole are in wire-to-wire contact without a gap, which can prevent microwaves from leaking out.

[0051] The material conveying device 2 includes gears 21 on both sides of the frame, and a chain conveyor belt 22 installed on the gears. The chain conveyor belt is made of non-metallic material, such as but not limited to plastic material, and a non-metallic support is provided at the bottom of the conveyor belt.

[0052] The discharging end of the material conveying device is provided with an infrared temperature measuring instrument 7, which can measure the surface temperature of the sample in real time and monitor the thawing condition.

[0053] The frame is also provided with a control system 6, including a PLC and a touch screen connected to the PLC. The PLC controls the material conveying device 2, the metal detector 3, the microwave processing module 4, the infrared temperature measuring instrument 7 and the motor 5 through the line. The touch screen is used as an operating position to set operation, alarm, prompt and other instructions, establish a database of thawing material process packages, execute relevant processes according to different materials, and set automatic thawing when there is material and automatic standby when there is no material.

[0054] like Figure 4 As shown, the microwave window is in the shape of a flat plate, which is a commonly used microwave window and is easy to manufacture.

[0055] The front and rear ends of the microwave processing module are open for the material conveying device to pass through. The inlet and outlet ends of the material conveying device are both provided with microwave suppressors, which include a reflective part and an absorbing part. The reflective part is usually an irregularly shaped metal, and the absorbing part is usually a graphene or silicon carbide plate, which is used to absorb the reflected microwaves. Any microwave suppressor currently sold on the market can be used. For specific structures, please refer to patents 201310631185.1 "Microwave suppressor and tunnel type microwave heating system" and 2018212792024 "An island type microwave suppressor". The test results show that the microwave leakage during the operation of the microwave in this application is generally 1-2.5mW / cm 2 .

[0056] Embodiment 2:

[0057] like Figure 5 As shown in FIG. 1 , the microwave window is a solid cylindrical type. The solid cylindrical type can better focus the microwave.

[0058] The height of the heating chamber is 30-60cm and the width is 30cm-60cm, which is suitable for thawing various standard meat packages (30*60*20cm) and meat and seafood of different shapes and sizes.

[0059] The rest are the same as in Example 1.

[0060] Embodiment 3:

[0061] The microwave power of the microwave processor is greater than or equal to 20KW.

[0062] The waveguide adopts the national standard BJ4, with a width of 533.4 and a height of 266.7mm.

[0063] The rest are the same as in Example 1.

[0064] The device is applicable to thawing various standard meat packages (30*60*20cm) and meat and seafood of different shapes and sizes, and can quickly return the temperature of the materials to the temperature range of -4 to -2℃; including standard meat packages (30*60*20cm, with plastic packaging film): duck, quartered beef, ten-quartered beef, sextupled pork, mutton, etc.; irregular shaped and sized foods: lamb legs, whole chickens and ducks, livestock and poultry, etc.; aquatic products: fish slips, shrimp slips, fish paste, frozen shrimp, etc. Different horn sizes, microwave window sizes and types, and heating cavity widths can be designed according to different objects. When changing the thawing object, it is only necessary to replace the corresponding size of the components according to the object. The entire production line does not need to be rebuilt on a large scale, which greatly improves the flexibility of use and saves a lot of costs.

[0065] The thawing process is as follows: the material is placed on the food carrier, and the standard meat block or sample to be thawed is placed on the feeding end of the conveyor belt. After passing the metal detector inspection, the conveyor belt runs automatically. The material is then subjected to microwave treatment in the microwave heating cavity to reach the target thawing temperature. After the temperature is measured by an infrared temperature measuring instrument, the material is discharged from the discharging end to achieve rapid and lossless thawing.

Claims

1. A method for thawing using a 433MHz heating chamber and a solid source industrial thawing device, characterized in that: The 433MHz heating chamber and solid source industrial thawing equipment include a material conveying device, a metal detector, a microwave processing module, and a motor placed on a frame; The motor is connected to the material conveying device through a line; the material conveying device is a conveying device made of non-metallic material, passes through the microwave processing module, and runs from the metal detector to the rear end; an infrared temperature measuring instrument is provided at the discharge end of the material conveying device; the material conveying device includes gears on both sides of the frame, a chain plate conveyor belt installed on the gears, the chain plate conveyor belt is made of non-metallic material, and a non-metallic support is provided at the bottom of the conveyor belt; The metal detector is arranged on one side of the feeding end of the conveyor belt; behind the metal detector is a microwave processing module, which includes two or more microwave processors connected in sequence, and the thermal types of the microwave processors are complementary; The microwave processor is a single-mode design, with a microwave source on the top and bottom respectively, the microwave source is connected to the bell mouth through a waveguide, and the upper and lower bell mouths are connected to the central heating cavity through microwave windows; the microwave source is a 433MHz solid-state microwave source; a reflection surface adjustment device is provided on the side of the heating cavity, including an inner plate made of metal, a screw rod and a scissor mechanism, the two ends of the scissor mechanism are respectively fixedly connected to the inner plate and the metal plate on the side of the heating cavity, the screw rod passes through the metal plate, and the end is a handle; the height of the heating cavity is 30-60cm, and the width is 30cm-60cm; The material is placed on the food carrier, and the food carrier is placed at the feeding end of the conveyor belt. After passing the metal detector inspection, the conveyor belt runs automatically, and then it is microwaved in the microwave heating cavity to reach the target thawing temperature. After the temperature is measured by the infrared temperature measuring instrument, the material is discharged from the discharging end to achieve rapid and lossless thawing. When changing the thawing object, you only need to replace the parts of the corresponding size according to the object.

2. The method according to claim 1, characterized in that: The frame is also provided with a control system, including a PLC and a touch screen connected to the PLC. The PLC controls the material conveying device, metal detector, microwave processing module, infrared temperature measuring instrument and motor through lines.

3. The method according to claim 1, characterized in that: The microwave window is flat or solid cylindrical.

4. The method according to claim 1, characterized in that: The inlet and outlet ends of the material conveying device are both provided with microwave suppressors.

5. The method according to claim 1, characterized in that: The microwave power of the microwave processor is greater than or equal to 20KW.

6. The method according to claim 1, characterized in that: The width of the waveguide is 533.4 mm and the height is 266.7 mm.

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