Multi-mode heated roasting apparatus and control system, control method thereof

Abstract

The present application relates to a multi-mode heating baking equipment and its control system and method. The multi-mode heating baking equipment comprises a baking cavity, a heat exchange cavity, a first cavity and a second cavity. A driving motor is fixed to the top of the second cavity. The output end of the driving motor is connected to a grill inside the baking cavity through a rotating shaft. A centrifugal fan is fixed to the top of the heat exchange cavity. A combustion machine and a heat exchanger are installed inside the heat exchange cavity. A radiation plate for generating infrared radiation is installed inside the baking cavity. The radiation plate is connected to the heat exchange cavity. The smoke or air inside the heat exchange cavity enters the radiation plate, so that the radiation plate generates infrared radiation to heat the food in the baking cavity. The radiation plate enables the baking equipment to have infrared radiation heating function, which can uniformly heat the food. By controlling the plate surface temperature of the radiation plate to match the wavelength range required for food baking, the energy utilization rate and baking quality are improved.

Description

Technical Field

[0001] This invention relates to the field of baking equipment technology, and in particular to a multi-mode heating baking device and its control system and control method. Background Technology

[0002] Most baking equipment uses fuel combustion or electric power to generate hot air for baking food. Their working mechanism is generally as follows: For fuel combustion baking equipment, in the heat exchange chamber, the high-temperature flue gas generated by the combustion of oil and gas indirectly heats the air through a heat exchanger. The hot air is then sent into the baking chamber to bake the food. The return air then returns to the heat exchange chamber and is heated again by the flue gas. The low-temperature flue gas generated during heat exchange (usually around 300 degrees Celsius) is directly discharged into the external environment. For electric heating baking equipment, in the heat exchange chamber, the air is directly heated by electric heating elements. The heated air is then sent into the baking chamber to bake the food. The return air then returns to the heat exchange chamber and is heated again by the electric heating elements. This cycle continues to bake the food in the baking chamber.

[0003] Existing methods for baking food using hot air have the following disadvantages:

[0004] (1) Hot air heating of food, from the perspective of heating principle, mainly heats food from the outside to the inside through heat conduction and convection heat exchange. For food containing a large amount of gas inside (such as mooncakes and bread with fillings), this heating method cannot prevent the gas inside the food from expanding, which poses an explosion hazard.

[0005] (2) The heat exchange method is singular and the temperature control range of the baking chamber is narrow, making it difficult to meet the baking needs of different types of food.

[0006] (3) For fuel-fired baking equipment, the exhaust temperature is too high, and a lot of heat is lost in the exhaust gas, resulting in low energy utilization efficiency of the equipment. Summary of the Invention

[0007] To address the shortcomings of existing production technologies, the applicant provides a multi-mode heating baking device and its control system and method. By setting up a radiant plate, the baking device has an infrared radiation heating function, which can evenly heat food. By controlling the surface temperature of the radiant plate to match the wavelength range required for food baking, the energy utilization rate and baking quality of the baking device are improved.

[0008] The technical solution adopted in this invention is as follows:

[0009] A multi-mode heating baking device includes a baking cavity, wherein the opposite side walls of the baking cavity are made of mesh plates, and several ventilation mesh holes are provided on the end face of the mesh plates. A heat exchange cavity is provided outside one mesh plate, and a first cavity is provided outside the other mesh plate. A microwave device for generating microwaves is installed in the first cavity. A second cavity is provided outside the top surface of the baking cavity, and the second cavity is connected to the first cavity.

[0010] A drive motor is fixed to the outside of the top of the second cavity. The output end of the drive motor is connected to a rotating shaft. The end of the rotating shaft passes through the second cavity and extends into the interior of the baking cavity, where it is connected to the baking rack inside the baking cavity. The drive motor drives the baking rack to rotate through the rotating shaft.

[0011] A centrifugal fan is fixed to the top of the heat exchange chamber. A heat exchange outlet and a heat exchange inlet are arranged sequentially from top to bottom on one side wall of the heat exchange chamber. The heat exchange inlet is connected to the baking chamber, and the heat exchange outlet is connected to the second chamber. A burner and a heat exchanger are installed inside the heat exchange chamber. The heat exchanger is provided with a flue gas outlet that is connected to the external environment.

[0012] The burner generates flue gas and introduces it into the heat exchanger, thereby heating the air inside the heat exchange chamber and outside the heat exchanger. The heated air is then directed by a centrifugal fan through the heat exchange outlet into the second chamber. The flue gas after heat exchange is then discharged into the external environment through the exhaust port.

[0013] The baking cavity is fitted with a radiation plate for generating infrared radiation. The medium inlet and medium outlet of the radiation plate are connected to the heat exchange cavity through a pipeline assembly. The flue gas or air inside the heat exchange cavity enters the radiation plate, causing the radiation plate to generate infrared radiation, thereby heating the food inside the baking cavity.

[0014] As a further improvement to the above technical solution:

[0015] The radiant plate is located between the two mesh plates.

[0016] The structure of the radiant panel is as follows: it includes galvanized steel plates, graphite plates and insulation cotton arranged in sequence. A serpentine tube is arranged between the insulation cotton and the graphite plates. Graphite paper is wrapped around the end face of the serpentine tube facing the insulation cotton.

[0017] The serpentine tube is made of copper.

[0018] The top of the baking cavity is equipped with both an emergency exhaust system and a regular exhaust system.

[0019] The emergency ventilation device includes a safety valve and a vent pipe;

[0020] The conventional ventilation system includes a safety valve and an exhaust pipe.

[0021] The baking cavity is fitted with a cabinet door.

[0022] A control system for a baking device based on the above-mentioned multi-mode heating includes a data acquisition and storage module, a data processing module, and a microprocessor module;

[0023] The microprocessor module contains a pre-stored baking process database;

[0024] The data acquisition and storage module includes a probe assembly, which detects environmental parameters inside the baking equipment.

[0025] The data processing module compares the environmental parameters with the corresponding parameters in the baking process database.

[0026] As a further improvement to the above technical solution:

[0027] The probe assembly includes several temperature probes, several flow probes, a pressure probe, and an electrical energy measuring instrument.

[0028] A control method based on the above-described control system includes the following steps:

[0029] S1. Obtain baking process parameters for different types of food through testing and experimentation;

[0030] S2. Store the acquired baking process parameters into the microprocessor module to build a baking process database;

[0031] S3. Based on the type of food to be baked, select the corresponding baking process parameters from the baking process database, and use these baking process parameters to bake the food.

[0032] S4. When there are no baking process parameters corresponding to the food to be baked in the baking process database, select the baking process parameters corresponding to the food type whose relative error in the composition ratio of the food to be baked is within 10% and whose relative error in the moisture content is within 5%, and perform baking. The definition of relative error is:

[0033]

[0034] Meanwhile, during the baking process, the data processing module optimizes the baking process parameters by using the environmental parameters obtained from the data acquisition and storage module, and the microprocessor module saves the optimized baking process parameters.

[0035] The beneficial effects of this invention are as follows:

[0036] This invention has a compact and reasonable structure and is easy to operate. It can be used individually or in combination with infrared radiation heating, hot air heating, and microwave heating. Infrared radiation heating can heat food evenly, hot air heating allows for easy adjustment of hot air temperature and flow rate by adjusting fuel combustion and air volume, and microwave heating can heat food from the inside out, maximizing energy utilization, ensuring the safety of the food baking process, and improving baking quality.

[0037] The present invention also has the following advantages:

[0038] (1) By using a variety of heating methods individually or in combination, the present invention can broaden the temperature control range of baking equipment and the applicability of baking products.

[0039] (2) In this invention, microwave heating can heat food from the inside out, while infrared radiation and hot air heating can heat food from the outside in. The combined use of these three heating methods can effectively improve the baking quality and ensure the safety of the baking process.

[0040] (3) In this invention, infrared radiation heating can utilize the waste heat of flue gas after heat exchange, thereby reducing the emission temperature of flue gas and improving energy utilization efficiency.

[0041] (4) In this invention, both microwave heating and infrared radiation heating can be controlled by adjusting the output frequency to match the food baking requirements, thereby improving the baking quality of the baking equipment while increasing the heat utilization efficiency.

[0042] (5) The present invention has a compact structure, reasonable layout, is easy to process and manufacture, and has low manufacturing cost. At the same time, the control system in the present invention has a simple control method, and the baking operation process based on the control system is simple, and operators can use it without professional training. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of the present invention.

[0044] Figure 2 This is the front view of the present invention.

[0045] Figure 3 This is a schematic diagram of the structure of the mesh plate in this invention.

[0046] Figure 4 This is a cross-sectional view of the radiating plate in this invention.

[0047] Figure 5 This is a flowchart of the control method in this invention.

[0048] The components are: 1. Heat exchange chamber; 2. Burner; 3. Heat exchanger; 4. Centrifugal fan; 5. Heat exchange inlet; 6. Heat exchange outlet; 7. Smoke outlet; 8. Baking chamber; 9. Radiant plate; 10. Mesh plate; 11. Drive motor; 12. Rotating shaft; 13. Grill rack; 14. First chamber; 15. Second chamber;

[0049] 901. Galvanized steel sheet; 902. Graphite sheet; 903. Serpentine tube; 904. Thermal insulation cotton; 905. Graphite paper. Detailed Implementation

[0050] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0051] Example 1:

[0052] like Figures 1-4 As shown, the multi-mode heating baking equipment of this embodiment includes a baking cavity 8. Both sides of the baking cavity 8 are made of mesh plates 10. Several ventilation holes are provided on the end face of the mesh plates 10. A heat exchange cavity 1 is provided outside one mesh plate 10, and a first cavity 14 is provided outside the other mesh plate 10. A microwave device for generating microwaves is installed inside the first cavity 14. A second cavity 15 is provided outside the top surface of the baking cavity 8, and the second cavity 15 communicates with the first cavity 14. A drive motor 11 is fixed to the top of the second cavity 15. The output end of the drive motor 11 is connected to a rotating shaft 12. The end of the rotating shaft 12 passes through the second cavity 15 and extends into the interior of the baking cavity 8, connecting to a baking rack 13 inside the baking cavity 8. The drive motor 11 drives the baking rack 13 to rotate through the rotating shaft 12. A centrifugal fan 4 is fixed to the top of the heat exchange cavity 1. One side wall of the heat exchange cavity 1 is formed by... The baking chamber 1 is equipped with a heat exchange outlet 6 and a heat exchange inlet 5. The heat exchange inlet 5 is connected to the baking chamber 8, and the heat exchange outlet 6 is connected to the second chamber 15. The heat exchange chamber 1 is equipped with a burner 2 and a heat exchanger 3. The heat exchanger 3 is equipped with a flue gas outlet 7 that is connected to the external environment. The burner 2 generates flue gas and introduces it into the interior of the heat exchanger 3, thereby heating the air inside the heat exchange chamber 1 and outside the heat exchanger 3. The heated air is then introduced into the second chamber 15 through the heat exchange outlet 6 by a centrifugal fan 4. The flue gas after heat exchange is discharged into the external environment through the flue gas outlet 7. The baking chamber 8 is equipped with a radiation plate 9 for generating infrared radiation. The medium inlet and medium outlet of the radiation plate 9 are connected to the heat exchange chamber 1 through a pipeline assembly. The flue gas or air inside the heat exchange chamber 1 enters the interior of the radiation plate 9, causing the radiation plate 9 to generate infrared radiation, thereby heating the food inside the baking chamber 8.

[0053] In this embodiment, the burner 2 is a dual-purpose oil and gas burner, used to generate high-temperature flue gas through fuel combustion;

[0054] Heat exchanger 3 includes a combustion chamber, a smoke box, a heat exchange tube bundle, and an exhaust pipe. It is used to exchange heat between the high-temperature flue gas generated by the burner 2 and the air in the heat exchange chamber 1 to generate circulating hot air. Figure 2 In the image, the arrows indicate the direction of hot air circulation.

[0055] The hot air generated in the heat exchange chamber 1 can also be generated by electric heating. The burner 2 and heat exchanger 3 are replaced by electric heaters. The air in the heat exchange chamber 1 is directly heated by the electric heaters. Under the action of the centrifugal fan 4, the air heated by the electric heaters forms a circulating hot air. The hot air temperature is achieved by controlling the output power and air volume of the electric heaters. This hot air can also be used as a heat source for the radiant plate 9 and is introduced into the serpentine tube 903.

[0056] Baking chamber 8 is a closed food baking space. Hot air in heat exchange chamber 1 is driven by centrifugal fan 4 and enters baking chamber 8 through second chamber 15 and first chamber 14 in sequence to bake the food in baking chamber 8.

[0057] The radiant plate 9 is located between the two mesh plates 10. The structure of the radiant plate 9 includes a galvanized steel plate 901, a graphite plate 902, and insulation cotton 904 stacked sequentially. A serpentine tube 903 is arranged between the insulation cotton 904 and the graphite plate 902. Graphite paper 905 is wrapped around the end face of the serpentine tube 903 facing the insulation cotton 904. The serpentine tube 903 is made of copper. The radiant plate 9 is placed on the opposite side of the baking cavity 8 door. Smoke or hot air enters the radiant plate 9 to heat it, causing it to emit infrared radiation to heat and bake the food. The temperature of the radiant plate 9 is adjusted by the temperature of the incoming smoke or hot air to achieve the best infrared radiation heating effect.

[0058] The radiant plate 9 adopts a three-layer structure, consisting of a smooth galvanized steel plate 902, a graphite plate 902, and an asbestos insulation cotton 904, with the thickness of the outer layer being smooth. The serpentine tube 903 is wrapped with graphite paper 905 and placed between the graphite plate 902 and the insulation cotton 904.

[0059] The 903 serpentine tube is made of metal, preferably copper. Copper tubes are easy to bend and have good sealing and pressure resistance.

[0060] The high emissivity of galvanized steel sheet 903 is beneficial for radiative heat exchange.

[0061] The graphite plate 902 has a high thermal conductivity, which can reduce thermal resistance and increase the heat transfer area between the serpentine tube 903 and the galvanized steel plate 901.

[0062] Hot air or flue gas flows inside the serpentine tube 903, transferring heat to the galvanized steel plate 901, causing it to generate infrared radiation.

[0063] The microwave device in this embodiment includes a microwave generator, a microwave waveguide, a microwave stirrer, a microwave isolation layer, and a microwave suppressor. The microwave generator generates microwaves whose frequency or wavelength is close to the inherent frequency or absorption wavelength of water molecules to facilitate rapid and efficient baking. The microwave waveguide introduces microwaves into the baking chamber, and the microwave waveguide has an outlet on the side wall of the baking chamber. The microwave stirrer stirs the microwaves entering the baking chamber, ensuring uniform microwave distribution for heating the food. The microwave stirrer is located at the inlet of the microwave waveguide and uses electromagnetic stirring. The uniformity of microwave distribution is adjusted by adjusting the electromagnetic power. The microwave isolation layer is a unidirectional filtering channel, allowing microwaves to pass through it into the baking chamber and preventing microwaves from escaping. The microwave isolation layer is located at the outlet of the microwave waveguide. The microwave suppressor prevents microwaves from escaping from the baking chamber.

[0064] The top of the baking chamber 8 is equipped with an emergency ventilation device and a regular ventilation device. The emergency ventilation device includes a safety valve and a vent pipe, which can prevent the gas inside the baking chamber 8 from expanding due to heat, causing the pressure to increase beyond the limit and resulting in an explosion. The regular ventilation device includes a safety valve and an exhaust pipe. When the gas inside the baking chamber 8 expands due to heat and the pressure reaches the set value, its safety valve opens to exhaust the gas.

[0065] The baking cavity 8 is equipped with a cabinet door. When the baking equipment is working, the cabinet door is closed, making the baking cavity 8 a closed space to improve the working efficiency of the baking equipment.

[0066] Example 2:

[0067] Based on the multi-mode heating baking equipment provided in Embodiment 1, this embodiment provides a control system, including a data acquisition and storage module, a data processing module, and a microprocessor module; the microprocessor module pre-stores a baking process database; the data acquisition and storage module includes a probe assembly that detects environmental parameters within the baking equipment; the data processing module compares the environmental parameters with corresponding parameters in the baking process database; the probe assembly includes several temperature probes, several flow probes, a pressure probe, and an electrical energy measuring instrument.

[0068] In this embodiment, the microprocessor module can construct a baking process database based on the baking process parameters of known types of food obtained from experiments; at the same time, the microprocessor module sends instructions to the burner 2 to control the output temperature of the burner 2, thereby adjusting the temperature inside the baking cavity 8.

[0069] The data processing module compares the environmental parameters with the corresponding parameters in the baking process database and sends the results to the microprocessor module, forming the criteria for the microprocessor module to send instructions to the burner 2;

[0070] The data acquisition and storage module is used to collect and store the structural parameters, fuel type, start / stop status, ambient temperature, baking mode, and baking time of the baking equipment.

[0071] The baking mode includes the internal pressure of the baking cavity 8, the hot air inlet temperature and flow parameters of the baking cavity 8, the hot air or flue gas inlet temperature and flow parameters of the radiant plate 9, and the operating frequency of the microwave device.

[0072] Within the baking chamber 8, a temperature probe is installed on the mesh plate 10 near the first chamber 14 to detect the inlet temperature of the hot air in the baking chamber 8; a temperature probe and a flow probe are installed on the mesh plate 10 near the heat exchange chamber 1 to detect the outlet temperature and flow rate of the hot air in the baking chamber 8; a pressure probe is also installed inside the baking chamber 8 to detect the internal pressure of the baking chamber 8, ensuring the safety of the baking process; a temperature probe is installed at the medium inlet of the radiant plate 9 to detect the inlet temperature of the hot air or flue gas; a temperature probe and a flow probe are installed at the medium outlet to detect the outlet temperature and flow rate of the hot air or flue gas.

[0073] A flow probe is installed at the fuel inlet of burner 2 to detect fuel flow.

[0074] Temperature probes and flow probes are installed at the 7 exhaust outlets to detect the temperature and flow rate of the flue gas flowing out of the heat exchanger 3;

[0075] The baking equipment is also equipped with an electrical energy meter to monitor whether the baking equipment is working properly;

[0076] The control signal lines of the aforementioned temperature probe, flow probe, pressure probe, power meter, microwave device, and safety valve are all electrically connected to the microprocessor module;

[0077] When the gas pressure inside the baking chamber 8 reaches the set value, the safety valve of the conventional exhaust device opens to exhaust gas; when the gas pressure inside the baking chamber 8 increases rapidly to the limit pressure, the safety valve of the emergency exhaust device opens to perform emergency exhaust.

[0078] Using the control system in this embodiment, the baking equipment can achieve at least seven heating modes: hot air mode, infrared radiation mode, hot air mode, hot air and infrared radiation hybrid mode, hot air and microwave hybrid mode, microwave and infrared radiation hybrid mode, and hot air, infrared radiation and microwave hybrid mode. During the food baking process, various heating modes can operate simultaneously or intermittently, and the specific control method is determined according to the baking requirements.

[0079] In hot air mode, the burner 2 starts and generates high-temperature flue gas, which enters the heat exchanger 3 and heats the air inside the heat exchange chamber 1 and outside the heat exchanger 3. The heated air passes through the heat exchange outlet 6, the second chamber 15, and the first chamber 14 in sequence, and enters the baking chamber 8 through the ventilated mesh of the mesh plate 10 near the first chamber 14. After directly contacting the food in the baking chamber 8, it passes through the ventilated mesh of the mesh plate 10 and the heat exchange inlet 5 in sequence and enters the heat exchange chamber 1. It is then heated again by the heat exchanger 3, and the cycle continues.

[0080] In infrared mode, the hot air generated by the burner 2 and heat exchanger 3 in the heat exchange chamber 1 flows into the serpentine tube 903 through the pipe assembly connected to the medium inlet of the radiant plate 9, thereby causing the radiant plate 9 to generate infrared radiation to heat the food in the baking chamber 8. The hot air in the serpentine tube 903 flows back to the heat exchange chamber 1 through the pipe assembly connected to the medium outlet for reheating, and so on.

[0081] Meanwhile, the high-temperature flue gas generated by the burner 2 and flowing into the heat exchanger 3 for heat exchange can also be used as a heat source for the radiant plate 9.

[0082] The flue gas in the heat exchanger 3 is connected to the pipeline group, so that the flue gas in the heat exchanger 3 flows into the serpentine tube 903, so that the radiant plate 9 generates infrared radiation. The flue gas flowing out of the serpentine tube 903 is discharged into the external environment through the pipeline group connected to the flue gas outlet, which can improve energy utilization.

[0083] In microwave mode, microwaves generated by the microwave device enter the baking cavity 8 through the ventilated mesh of the mesh plate 10 near the first cavity 14 to bake the food.

[0084] In the hot air and infrared radiation mixed mode, food baking is carried out by a combination of hot air heating and infrared radiation heating. Part of the hot air in the heat exchange chamber 1 is sent into the baking chamber 8 for hot air heating, and the other part flows into the serpentine tube 903, so that the radiation plate 9 generates infrared radiation. After cooling, all the hot air returns to the heat exchange chamber 1 for heat exchange again, and so on.

[0085] In the hot air and microwave hybrid mode, food baking is carried out by a combination of hot air heating and microwave heating. The hot air in the heat exchange chamber 1 is directly sent into the baking chamber 8 for hot air heating. After cooling, the hot air returns to the heat exchange chamber 1 for heat exchange again, and so on. At the same time, the microwave device generates microwaves and introduces them into the baking chamber 8 to microwave bake the food.

[0086] In the microwave and infrared radiation hybrid mode, the microwave device generates microwaves and introduces them into the baking cavity 8 to microwave bake the food; at the same time, the hot air in the heat exchange cavity 1 flows into the serpentine tube 903, causing the radiation plate 9 to generate infrared radiation. After cooling down, all the hot air returns to the heat exchange cavity 1 to exchange heat again, and so on.

[0087] In the hot air, infrared radiation, and microwave hybrid mode, food baking is carried out by a combination of hot air heating, infrared radiation heating, and microwave heating. Part of the hot air in the heat exchange cavity 1 is sent into the baking cavity 8 for hot air heating, and the other part flows into the serpentine tube 903, so that the radiation plate 9 generates infrared radiation. After cooling, all the hot air returns to the heat exchange cavity 1 for heat exchange again, and so on. At the same time, the microwave device generates microwaves and introduces them into the baking cavity 8 to microwave bake the food.

[0088] Example 3:

[0089] like Figure 5 As shown, utilizing the multi-mode heating baking equipment provided in Embodiment 1 and the control system provided in Embodiment 2, this embodiment provides a control method, including the following steps:

[0090] S1. Obtain baking process parameters for different types of food through testing and experimentation;

[0091] S1.1. Baking process parameters include: food type and quantity, baking mode and baking time, hot air inlet temperature and flow rate of baking cavity 8 in baking mode, allowable safe pressure and ultimate pressure in baking cavity 8, hot air or flue gas inlet temperature and flow rate of radiant plate 9, and operating frequency and stirring speed of microwave device.

[0092] S1.2. When formulating baking process parameters, factors such as the structural parameters of the baking equipment, the type of fuel used by the burner 2, and the ambient air temperature need to be considered.

[0093] S2. Store the acquired baking process parameters into the microprocessor module to build a baking process database;

[0094] S3. Based on the type of food to be baked, select the corresponding baking process parameters from the baking process database, and use these baking process parameters to bake the food.

[0095] S4. When there are no baking process parameters corresponding to the food to be baked in the baking process database, select the baking process parameters corresponding to the food type whose relative error in the composition ratio of the food to be baked is within 10% and whose relative error in the moisture content is within 5%, and perform baking. The definition of relative error is:

[0096]

[0097] Meanwhile, during the baking process, the data processing module optimizes the baking process parameters by using the environmental parameters obtained from the data acquisition and storage module, and the microprocessor module saves the optimized baking process parameters.

[0098] Example 4:

[0099] Using the control method provided in Embodiment 3, this embodiment takes salted egg yolk mooncakes as an example to provide a specific baking process, including the following steps:

[0100] Step 1: Wrap the raw salted egg yolks around the other fillings and dough to make mooncake dough;

[0101] Step 2: Spray a chitosan solution with a mass concentration of approximately 1% onto the surface of the mooncake dough;

[0102] The chitosan solution sprayed on the surface of the mooncake dough is a natural preservative that is harmless to the human body. It also helps prevent the mooncake from cracking and spoiling and improves its preservation effect.

[0103] Step 3: Since metal baking trays cannot be used in microwave baking, a ceramic baking tray is used in this embodiment. The mooncake dough is placed on the ceramic baking tray and sent into the baking cavity 8, and then placed on the baking rack 13.

[0104] Start the microwave device and set its operating frequency to 2500MHz-2800MHz;

[0105] The output temperature of the burner 2 is set such that the surface temperature of the radiant plate 9 is 170℃-230℃;

[0106] Set the baking time to 14-18 minutes;

[0107] Step 4: After completing Step 3, remove the mooncakes from baking cavity 8, brush the surface of the salted egg yolk mooncakes with egg yolk liquid twice, and then put them back into baking cavity 8 for baking. Set the baking time to 6-10 minutes, and keep the other parameters unchanged.

[0108] Step 5: After completing Step 4, remove the baked mooncakes and let them cool at room temperature for at least 24 hours to complete the mooncake baking process.

[0109] Example 5:

[0110] Using the control method provided in Embodiment 3, this embodiment takes salted egg yolk mooncakes as an example to provide another specific baking process, including the following steps:

[0111] Step 1: Wrap the raw salted egg yolks with other fillings and dough to form mooncake dough, and spray the surface of the mooncake dough with a chitosan solution with a mass concentration of about 1%.

[0112] Step 2: Place the mooncake dough on the ceramic baking tray and put it into the baking cavity 8;

[0113] First, the hot air baking mode is adopted, and the output temperature of the burner 2 is set so that the hot air inlet temperature in the baking chamber 8 is 130℃-150℃, and the baking time is set to 3 minutes-5 minutes;

[0114] The hot air baking mode uses convection heat exchange, which ensures that the mooncake dough is heated evenly, allowing the outer shell of the mooncake dough to mature and set.

[0115] Step 3: After the convection baking mode is finished, switch to microwave baking mode;

[0116] Turn on the microwave device, set its operating frequency to 2500MHz-2800MHz, and set the baking time to 13-16 minutes;

[0117] Since the outer shell of the mooncake dough has less moisture after being baked by hot air, while the filling inside the mooncake dough has more moisture, the microwave baking mode causes the water molecules in the filling to move quickly, and at the same time, the salted egg yolk in the center of the filling is heated quickly, baking the salted egg yolk to about 80% cooked.

[0118] Step 4: Brush the surface of the removed egg yolk mooncakes with egg yolk liquid twice, then place them into baking cavity 8;

[0119] Apply a thin layer of egg yolk liquid to the surface of the egg yolk mooncake. After the egg yolk liquid dries on the surface of the mooncake, apply a thicker layer of egg yolk liquid again.

[0120] Because the surface temperature of freshly baked mooncakes is high, when brushing on the egg yolk for the first time, a thin layer of egg yolk should be brushed on first to quickly cool the surface of the mooncakes, and then a thicker layer of egg yolk should be brushed on second time to spread the egg yolk evenly.

[0121] Step 5: After the microwave baking mode is finished, switch to the infrared baking mode;

[0122] The output temperature of the burner 2 is set such that the surface temperature of the radiant plate 9 is 150℃-210℃;

[0123] Set the baking time to 6-10 minutes, and use infrared radiation to give the mooncakes a golden crust.

[0124] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A multi-mode heating baking device, characterized in that: The baking cavity (8) includes a baking chamber (8), and the two opposite side walls of the baking chamber (8) are made of mesh plates (10). Several ventilation mesh holes are provided on the end face of the mesh plates (10). A heat exchange chamber (1) is provided on the outside of one mesh plate (10), and a first cavity (14) is provided on the outside of the other mesh plate (10). A microwave device for generating microwaves is installed in the first cavity (14). A second cavity (15) is provided on the outside of the top surface of the baking cavity (8), and the second cavity (15) is connected to the first cavity (14). A drive motor (11) is fixed to the outside of the top of the second cavity (15). The output end of the drive motor (11) is connected to a rotating shaft (12). The end of the rotating shaft (12) passes through the second cavity (15) and extends into the interior of the baking cavity (8), and is connected to the baking rack (13) inside the baking cavity (8). The drive motor (11) drives the baking rack (13) to rotate through the rotating shaft (12). A centrifugal fan (4) is fixed to the outside of the top of the heat exchange chamber (1). A heat exchange outlet (6) and a heat exchange inlet (5) are arranged sequentially from top to bottom on one side wall of the heat exchange chamber (1). The heat exchange inlet (5) is connected to the baking chamber (8), and the heat exchange outlet (6) is connected to the second chamber (15). A burner (2) and a heat exchanger (3) are installed inside the heat exchange chamber (1). The heat exchanger (3) is provided with a flue gas outlet (7) that is connected to the external environment. The burner (2) generates flue gas and passes it into the interior of the heat exchanger (3), thereby heating the air inside the heat exchange chamber (1) and outside the heat exchanger (3). The heated air is then passed through the heat exchange outlet (6) into the second chamber (15) by the centrifugal fan (4). The flue gas after heat exchange is discharged to the external environment through the exhaust port (7). The baking cavity (8) is fitted with a radiation plate (9) for generating infrared radiation. The medium inlet and medium outlet of the radiation plate (9) are connected to the heat exchange cavity (1) through a pipeline group. The flue gas or air inside the heat exchange cavity (1) enters the radiation plate (9), causing the radiation plate (9) to generate infrared radiation, thereby heating the food in the baking cavity (8). The radiating plate (9) is located between the two mesh plates (10); The structure of the radiant plate (9) is as follows: it includes a galvanized steel plate (901), a graphite plate (902) and insulation cotton (904) arranged in sequence. A serpentine tube (903) is arranged between the insulation cotton (904) and the graphite plate (902). Graphite paper (905) is wrapped around the end face of the serpentine tube (903) facing the insulation cotton (904).

2. The multi-mode heating baking equipment as described in claim 1, characterized in that: The serpentine tube (903) is made of copper.

3. The multi-mode heating baking equipment as described in claim 1, characterized in that: The top of the baking cavity (8) is equipped with an emergency exhaust device and a regular exhaust device.

4. The multi-mode heating baking equipment as described in claim 3, characterized in that: The emergency ventilation device includes a safety valve and a vent pipe; The conventional ventilation system includes a safety valve and an exhaust pipe.

5. The baking equipment with multi-mode heating as described in claim 1, characterized in that: The baking cavity (8) is fitted with a cabinet door.

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