Light wave hot air pizza oven intelligent control system and light wave hot air pizza oven

Abstract

The present invention provides an intelligent control system for a light wave hot air pizza oven, comprising: a light wave heating module, a hot air module, a temperature sensor, a humidity sensor, and an intelligent control module installed within the light wave hot air pizza oven. The intelligent control module operates as follows: S1: system initialization; S2: driving the hot air module to heat the pizza oven according to set initialization parameters, while simultaneously invoking the temperature sensor and the humidity sensor to collect temperature and humidity data; S3: calculating the optimal temperature T1 at which the light wave heating module intervenes; S4: when the temperature sensor detects that the pizza has reached the optimal intervention temperature T1, invoking a PID calculation program to control the light wave heating module to intervene, allowing the light wave hot air pizza oven to quickly reach the set target temperature T2 and rapidly heat the pizza crust. This intelligent control system can accurately determine the optimal intervention point for light wave heating, implement an optimal heating strategy for the material surface and the surface, and optimize energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of food processing equipment, and in particular to an intelligent control system of a light wave hot air pizza oven and a light wave hot air pizza oven. Background Art

[0002] A hot air stove is a device that heats and cooks food in a sealed space. Existing hot air stoves generally use resistance heating. This means that the heating element is first powered to increase temperature. Some of the heat generated by the heating element is transferred to the air, while another portion is radiated to the gas container wall. Then, some of the heat is transferred through the air to the gas container wall, and then to the gas through the gas container wall. The remaining radiated heat is transferred directly through the gas container wall to the gas. Heat transferred through the air undergoes two heat transfers before reaching the gas. Consequently, this heating method results in significant heat loss, slow heating rates, and high power consumption.

[0003] When powered on, a lightwave oven generates a voltage drop when current flows through the heating wire, generating power that is converted into heat. Halogen-containing inert gas is filled in the heating wire's glass tube, generating light radiation. This radiation is focused by a concave reflector and reflected onto the glass-ceramic plate, which is converted into heat. The heat generated by the heating wire also transfers to the glass-ceramic plate, heating the object being heated. The heating element in a lightwave oven is a lightwave tube. When powered on, the light emitted strikes the reflective surface of the concave reflector, concentrating the radiation. This concentrated heat, combined with the power input from the lightwave tube itself, is simultaneously transferred to the high-temperature glass-ceramic plate, heating it to a temperature of 600-800°C within seconds. This heat is then transferred to the object being heated. This heat transfer method achieves thermal efficiency exceeding 95%, providing efficient and rapid heating of the object. This demonstrates the unique ability of a lightwave oven to simultaneously convert both electrical energy and light radiation into heat.

[0004] In the actual baking process, high-quality pizza has its own heating requirements, that is, the crust needs to be crispy, but the middle part needs to be kept soft and sticky. Existing pizza ovens generally use hot air heating and baking, but the slow baking with hot air has the following main defects: (1) high energy consumption and slow speed. It takes 8-20 minutes to bake a pizza normally; (2) due to low heating efficiency and slow baking speed, it is difficult to achieve the effect of crispy crust while keeping the middle part soft and sticky (because the middle part will gradually become crispy after a long heating time); (3) it is impossible to accurately find the best intervention point of light wave heating, and it is impossible to achieve the best heating strategy for the surface of the material and the surface, and it is impossible to optimize energy consumption. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention proposes a light wave hot air pizza oven intelligent control system and a light wave hot air pizza oven. The intelligent control system can accurately find the optimal intervention point of light wave heating when using a mixed heating mode of light wave and hot air, realize the optimal heating strategy for the material surface and the surface, and optimize energy consumption.

[0006] To implement the above technical solution, the present invention provides an intelligent control system for a light wave hot air pizza oven, comprising: a light wave heating module, a hot air module, a temperature sensor, a humidity sensor, and an intelligent control module installed in the light wave hot air pizza oven. The intelligent control module is electrically connected to the light wave heating module, the hot air module, the temperature sensor, and the humidity sensor, respectively. The intelligent control module operates as follows:

[0007] S1, system initialization;

[0008] S2. According to the set initialization parameters, the hot air module is driven to heat the pizza oven, and the temperature sensor and humidity sensor are called to collect temperature and humidity.

[0009] S3, calculating the optimal temperature T1 when the light wave heating module is involved;

[0010] S4. When the temperature sensor detects that the pizza has been heated to the optimal intervention temperature T1, the PID calculation program is called to control the light wave heating module to intervene, so that the light wave hot air pizza oven quickly reaches the set target temperature T2 and quickly heats the pizza crust.

[0011] Preferably, in step S3, the optimal temperature T1 when the light wave heating module is involved is calculated by the following method:

[0012] S31. According to Newton's law of cooling, when an object is exposed to hot air, its surface temperature will gradually approach the temperature of the hot air over time. The formula for calculating the change in the object's surface temperature is as follows:

[0013] ;

[0014] Where, T(t) is the temperature of the material at time t, T 环境 is the temperature of hot air, T 初始 is the initial temperature of the material, k is a positive constant that depends on the properties of the material and the hot air, and t is the heating time;

[0015] S32. A regression equation was established with drying time as an influencing factor. The drying time and process parameter optimization equation was:

[0016] ;

[0017] In formula 2, is the drying time for the material surface to rise from temperature T1 to target temperature T2 during the light wave heating process, min; X1 is the light wave temperature control temperature, °C; X2 is the drying time per cycle, min; X3 is the temperature difference, i.e. T2-T1, °C;

[0018] S33. The light wave tube in the light wave heating module converts electrical energy into thermal energy. The electrothermal equivalent is calculated from the electric power:

[0019] ;

[0020] In formula 3, Q is the heat generated by the resistor when it is energized, in J, U is the operating voltage across the resistor, in V, and Rt is the resistance of the resistor in the operating state, in Ω;

[0021] According to Joule's law, the electric power P required for thermoelectricity is calculated according to Formula 4:

[0022] ;

[0023] S34. Based on the required total electrical power P, the system can accurately calculate the time required for the light wave heating process according to formula 3 and formula 4. , and then reversely calculate the temperature difference X3 according to formula 2. Since the target temperature T2 is known, the material surface temperature T1 can be accurately calculated. This is the best time to intervene with light wave heating.

[0024] Preferably, in step S4, the process of calling the PID calculation program to control the intervention of the light wave heating module is as follows:

[0025] S41, determine the fuzzy PID control formula:

[0026] ;

[0027] Among them, △P is the output value of the PID algorithm result; K P is the proportional coefficient; e is the deviation; T i is the integration constant; T d is a differential constant; t is the current moment, which is a continuous variable;

[0028] S42, according to the discrete calculation formula

[0029] ;

[0030] in, is the input signal of the signal sampler. When t=0, the sampler is closed for T seconds. The smaller the period T is, the more data is obtained and the better the control effect is.

[0031] S43, determine T and T according to formula 6 i 、T d After obtaining the deviation value e at each moment, the operation value of each time period n is calculated. The processor calculates the operation value to realize fuzzy PID control.

[0032] The present invention also provides a light wave hot air pizza oven, comprising: the above-mentioned light wave hot air pizza oven intelligent control system, and also comprising a movable shelf box, a light wave hot air oven is installed on the top of the movable shelf box, a pizza conveying device passes through the left and right sides of the light wave hot air oven horizontally, a control box is installed on one side of the light wave hot air oven, and a control panel is installed on the control box.

[0033] Preferably, the light wave hot air furnace includes an outer box body, an inner box body is installed in the outer box body, the light wave heating module, hot air module, temperature sensor, and humidity sensor are all installed in the inner box body, the hot air module includes a fan installed on the top of the inner box body and arranged vertically downward, an annular electric heating tube is installed on the periphery of the fan blades at the front end of the fan, and a uniform wind hole plate is installed on the top of the inner box body below the annular electric heating tube, and uniform wind holes are evenly opened on the surface of the uniform wind hole plate; the light wave heating module includes a plurality of upper carbon fiber light wave tubes installed in the inner box body and below the uniform wind hole plate, and a plurality of lower carbon fiber light wave tubes installed at the bottom of the inner box body, and the pizza conveying device passes through the left and right sides of the inner box body of the light wave hot air furnace in the horizontal direction and is located between the upper carbon fiber light wave tube and the lower carbon fiber light wave tube.

[0034] Preferably, the pizza conveying device includes a frame, which is fixedly mounted on the top of the mobile shelf box, with an active roller and a passive roller mounted on the left and right ends of the frame respectively, and a plurality of chain transmission gears are mounted on the active roller and the passive roller respectively, and a ring transmission chain is mounted between the corresponding chain transmission gears, and the conveying motor is mounted on one side of the active roller and connected to the transmission shaft of the active roller.

[0035] Preferably, a support and protection frame is installed between the upper carbon fiber light wave tube and the lower carbon fiber light wave tube in the inner box of the light wave hot air furnace, the upper end of the annular transmission chain passes over the support and protection frame, and the lower end of the annular transmission chain passes under the support and protection frame.

[0036] Preferably, heat dissipation holes are evenly arranged on the back plate of the outer box body, two parallel and spaced heat dissipation fans are installed on the top of the back plate, one end of the exhaust pipe is installed on the back plate, and the other end of the exhaust pipe extends into the inner box body.

[0037] Preferably, a shelf is provided in the mobile shelf box, and a plurality of universal wheels are provided at the bottom of the mobile shelf box.

[0038] The beneficial effects of the light wave hot air pizza oven intelligent control system and the light wave hot air pizza oven provided by the invention are:

[0039] (1) The intelligent control system of this light wave hot air pizza oven is highly intelligent. When using the light wave and hot air mixed heating mode, it can accurately find the best intervention point of light wave heating to achieve high-quality pizza baking. First, the pizza is heated slowly at a low temperature by hot air heating, and the pizza is heated evenly. Then, the best intervention point of light wave heating is accurately found, and light wave heating is used to quickly heat the pizza crust, so that the middle part of the pizza with fillings can remain soft and glutinous while achieving a crispy effect on the crust, greatly improving the quality of pizza baking. It can also effectively reduce energy consumption, realize the best heating strategy for pizza, optimize energy consumption, and reduce the time of pizza baking. Normally, it takes 4-8 minutes to bake a pizza.

[0040] (2) This light wave hot air pizza oven has a simple structure, reasonable design, high intelligence, high heating efficiency, and uniform heat distribution in the oven. When actually working, you only need to place the pizza to be baked on the pizza conveyor. The pizza conveyor will drive the pizza to be baked from left to right into the inner box of the hot air oven. The annular electric heating tube works to heat the air, and then the heated air is evenly transported from top to bottom through the uniform air hole plate through the fan to ensure that the hot air in the inner box is evenly distributed. At the optimal temperature intervention point, the upper carbon fiber light wave tube and the lower carbon fiber light wave tube are controlled to work simultaneously, and the top and bottom surfaces of the pizza are quickly heated at the same time, so that the middle part of the pizza can remain soft and glutinous while achieving a crispy crust, thereby improving the quality of pizza baking. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a front view of the three-dimensional structure of the light wave hot air pizza oven in the present invention.

[0042] Figure 2 This is a rear view of the three-dimensional structure of the light wave hot air pizza oven of the present invention.

[0043] Figure 3 Schematic diagram of the internal structure of the light wave hot air pizza oven in the present invention Figure I .

[0044] Figure 4 Schematic diagram of the internal structure of the light wave hot air pizza oven in the present invention Figure II .

[0045] Figure 5 This is a schematic diagram of the explosion of the internal structure of the light wave hot air pizza oven in the present invention.

[0046] In the figure: 1. Mobile shelf box; 2. Pizza conveyor; 21. Frame; 22. Active roller; 23. Passive roller; 24. Conveying motor; 25. Chain drive gear; 26. Support and protection frame; 3. Light wave hot air furnace; 31. Outer box; 32. Back plate; 33. Inner box; 34. Cooling fan; 35. Exhaust pipe; 36. Fan; 37. Ring electric heating tube; 38. Air uniformity plate; 39. Intelligent control module; 310. Upper carbon fiber light wave tube; 311. Lower carbon fiber light wave tube; 4. Control box; 5. Control panel; 6. Shelf; 7. Universal wheel. DETAILED DESCRIPTION

[0047] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary persons in this field without creative work are within the scope of protection of the present invention.

[0048] Example 1: A light wave hot air pizza oven.

[0049] Reference Figures 1 to 5 As shown, a light wave hot air pizza oven comprises: a mobile shelf box 1, wherein the mobile shelf box 1 is provided with a shelf 6 for temporarily storing pizzas before or after baking, and a plurality of universal wheels 7 are provided at the bottom of the mobile shelf box 1 to facilitate the overall movement of the pizza oven. A light wave hot air oven 3 is installed on the top of the mobile shelf box 1, and a pizza conveyor 2 runs through the left and right sides of the light wave hot air oven 3 in the transverse direction. The pizza conveyor 2 comprises a frame 21, which is fixedly mounted on the top of the mobile shelf box 1, and a driving roller 22 and a passive roller 23 are respectively mounted on the left and right ends of the frame 21, and a plurality of chain transmission gears 25 are correspondingly mounted on the driving roller 22 and the passive roller 23, and a ring transmission chain is installed between the corresponding chain transmission gears 25. A conveying motor 24 is mounted on one side of the driving roller 22 and is connected to the transmission shaft of the driving roller 22. During actual operation, the active roller 22 is driven to rotate by the conveying motor 24, which in turn drives the annular transmission chain to rotate. The pizza to be baked is placed on the annular transmission chain and moves from left to right under the drive of the annular transmission chain. When it moves to the inner box 33 of the hot air oven, it can stop rotating until the pizza is baked, and then take the pizza out of the hot air oven.

[0050] The control box 4 is installed on one side of the light wave hot air stove 3. A control panel 5 is installed on the control box 4. During actual operation, the working parameters of the pizza oven can be controlled by the control panel 5.

[0051] The light wave hot air oven 3 includes an outer box 31, an inner box 33 is installed in the outer box 31, and the light wave heating module, hot air module, temperature sensor, and humidity sensor are all installed in the inner box. The hot air module includes a fan 36 installed on the top of the inner box 33 and arranged vertically downward. An annular electric heating tube 37 is installed on the periphery of the fan blades at the front end of the fan 36. A uniform wind hole plate 38 is installed on the top of the inner box 33 below the annular electric heating tube 37. Uniform wind holes are evenly opened on the surface of the uniform wind hole plate 38. The light wave heating module includes a plurality of upper carbon fiber light wave tubes 310 arranged side by side and spaced apart, which are installed in the inner box 33 and located below the uniform wind hole plate 38, and a plurality of lower carbon fiber light wave tubes 311 arranged side by side and spaced apart, which are installed at the bottom of the inner box 33. The pizza conveying device 2 passes through the left and right sides of the inner box 33 of the light wave hot air oven in the horizontal direction and is located between the upper carbon fiber light wave tube 310 and the lower carbon fiber light wave tube 311. During operation, the pizza to be baked is simply placed on the pizza conveyor 2, which then drives the pizza from left to right into the inner box 33 of the hot air oven. The annular electric heating tube 37 heats the air, and then the fan 36 evenly transports the heated air from top to bottom through the uniform air plate 38, ensuring that the hot air in the inner box 33 is evenly distributed. The upper carbon fiber light wave tube 310 and the lower carbon fiber light wave tube 311 are controlled to operate simultaneously at the optimal temperature intervention point, rapidly heating the top and bottom surfaces of the pizza. When the pizza is finished baking, the pizza conveyor 2 takes the baked pizza out of the inner box 33, and the baked pizza can be temporarily stored in the mobile shelf box 1.

[0052] A support and protection frame 26 is installed in the inner box 33 of the hot air oven between the upper carbon fiber light wave tube 310 and the lower carbon fiber light wave tube 311. The upper end of the circular transmission chain passes over the support and protection frame 26, and the lower end of the circular transmission chain passes under the support and protection frame 26. In actual operation, the support and protection frame 26 can ensure that the pizza can be well supported and protected during the baking process.

[0053] The back panel 32 of the outer housing 31 is evenly distributed with cooling holes. Two parallel, spaced-apart cooling fans 34 are installed on top of the back panel 32. One end of a smoke exhaust pipe 35 is mounted on the back panel 32, and the other end of the smoke exhaust pipe 35 extends into the inner housing 33. During operation, the cooling holes on the back panel 32 and the cooling fans 34 allow rapid heat dissipation from the outside of the inner housing 33, while smoke generated during pizza baking is discharged through the smoke exhaust pipe 35. An intelligent control module 39 is installed in the cavity between the inner and outer housings 33 and 31, enabling automatic control of the pizza oven during operation.

[0054] The light wave hot air pizza oven has a simple structure, reasonable design, high intelligence, high heating efficiency, and uniform heat distribution in the oven. During actual operation, it is only necessary to place the pizza to be baked on the pizza conveyor 2, and the pizza conveyor 2 will drive the pizza to be baked from left to right into the inner box of the light wave hot air oven 3. The annular electric heating tube 37 works to heat the air, and then the heated air is evenly transported from top to bottom through the uniform air hole plate 38 by the fan 36, ensuring that the hot air in the inner box 33 is evenly distributed, and the upper carbon fiber light wave tube 310 and the lower carbon fiber light wave tube 311 are controlled to work simultaneously at the optimal temperature intervention point, so as to quickly heat the top and bottom surfaces of the pizza at the same time, so that the middle part of the pizza can remain soft and glutinous while achieving a crispy crust, thereby improving the quality of pizza baking.

[0055] Example 2: An intelligent control system for a light wave hot air pizza oven.

[0056] Reference Figures 1 to 5 As shown, an intelligent control system for a light wave hot air pizza oven includes: a light wave heating module, a hot air module, a temperature sensor, a humidity sensor, and an intelligent control module installed in the light wave hot air pizza oven. The intelligent control module is electrically connected to the light wave heating module, the hot air module, the temperature sensor, and the humidity sensor respectively. The light wave heating module includes an upper carbon fiber light wave tube 310 and a lower carbon fiber light wave tube 311. The hot air module includes a fan 36 and a ring electric heating tube 37. The intelligent control module operates as follows:

[0057] S1. The system is powered on, the main program starts initialization, and sets a series of parameters;

[0058] S2. According to the set initialization parameters, the hot air module is driven to heat the pizza oven, and the temperature sensor and humidity sensor are called to collect temperature and humidity. In the actual working process, the system will drive the annular electric heating tube 37 to heat the air, and then the heated air is evenly transported from top to bottom through the uniform air hole plate 38 by the fan 36, and the pizza placed in the inner box 33 is heated by hot air. The purpose of hot air heating is to heat the crust and the middle part of the pizza slowly first, to ensure that the pizza is heated evenly, and to make the crust and the middle part of the pizza cooked, and then enable light wave rapid heating, using light wave high temperature heating to quickly heat the pizza crust in a short time, so that the pizza crust becomes crispy, and based on the different materials of the middle part of the pizza, it will not quickly become crispy in a short time, and will still remain soft and sticky. However, when the light wave heating module intervenes is the core problem that the present invention needs to solve.

[0059] S3. Calculate the optimal temperature T1 when the light wave heating module is engaged. In actual operation, hot air heating is slow and consumes the most energy, while light wave heating is fast and consumes less energy. Light wave heating can reach a high temperature of 600°C-800°C in seconds, and then transfers heat to the heated object. This heat transfer method can achieve a thermal efficiency of over 95%, effectively and quickly heating the heated object. For a food like pizza, it is necessary to keep the center of the filling soft and glutinous, while also keeping the crust crispy. However, in the actual heating process, if hot air alone is used to heat the pizza, it is difficult to achieve the effect of a crispy crust while keeping the center of the filling soft and glutinous. The main reason is that during the long period of hot air heating the pizza crust, a large amount of heat is also transferred to the center of the filling, causing the center of the filling to slowly harden, which will seriously affect the taste of the pizza. Since the crust of the pizza is flour, and the middle part is a mixture of flour, cheese, meat, fruit, cream, etc., the heating temperature and speed are different. Therefore, when the light wave and hot air mixed heating mode is turned on, the hot air heating needs to be turned on first. When the hot air heats the pizza to a certain temperature, the light wave heating is started again, and then the pizza crust is quickly heated in a short time, while minimizing the impact on the middle part with the stuffing. This can not only achieve the lowest energy consumption and shorten the pizza heating time, but also ensure the best taste of the pizza after heating. Therefore, how to calculate the optimal temperature T1 when the light wave heating module intervenes is the core problem solved by the present invention.

[0060] To solve the above problem, the present invention specifically calculates the optimal temperature T1 when the light wave heating module is involved in the following way:

[0061] S31. According to Newton's law of cooling, when an object is exposed to hot air, its surface temperature will gradually approach the temperature of the hot air over time. The formula for calculating the change in the object's surface temperature is as follows:

[0062] ;

[0063] Where, T(t) is the temperature of the material at time t, T 环境 is the temperature of hot air, T 初始 is the initial temperature of the material, k is a positive constant that depends on the properties of the material and the hot air, and t is the heating time;

[0064] S32. A regression equation was established with drying time as an influencing factor. The drying time and process parameter optimization equation was:

[0065] ;

[0066] In formula 2, is the drying time for the material surface to rise from temperature T1 to target temperature T2 during the light wave heating process, min; X1 is the light wave temperature control temperature, °C; X2 is the drying time per cycle, min; X3 is the temperature difference, i.e. T2-T1, °C;

[0067] S33. The light wave tube in the light wave heating module converts electrical energy into thermal energy. The electrothermal equivalent is calculated from the electric power:

[0068] ;

[0069] In formula 3, Q is the heat generated by the resistor when it is energized, in J, U is the operating voltage across the resistor, in V, and Rt is the resistance of the resistor in the operating state, in Ω;

[0070] According to Joule's law, the electric power P required for thermoelectricity is calculated according to Formula 4:

[0071] ;

[0072] S34. Based on the required total electrical power P, the system can accurately calculate the time required for the light wave heating process according to formula 3 and formula 4. Then, using Formula 2, we reverse-calculate the temperature difference X3. Since the target temperature T2 is known, we can accurately calculate the material surface temperature T1, which indicates the optimal time to intervene with light wave heating. When the system intervenes at the optimal temperature T1, it controls the upper and lower carbon fiber light wave tubes to operate simultaneously, rapidly heating both the top and bottom surfaces of the pizza. This keeps the center of the pizza soft and glutinous while achieving a crispy crust, improving the quality of the pizza.

[0073] S4. When the temperature sensor detects that the pizza has been heated to the optimal intervention temperature T1, the PID calculation program is called to control the light wave heating module to intervene, so that the light wave hot air pizza oven quickly reaches the set target temperature T2 and quickly heats the pizza crust.

[0074] The process of calling the PID calculation program to control the intervention of the light wave heating module is as follows:

[0075] S41, determine the fuzzy PID control formula:

[0076] ;

[0077] Among them, △P is the output value of the PID algorithm result; K P is the proportional coefficient; e is the deviation; T i is the integration constant; T d is a differential constant; t is the current moment, which is a continuous variable;

[0078] S42, according to the discrete calculation formula

[0079] ;

[0080] in, is the input signal of the signal sampler. When t=0, the sampler is closed for T seconds. The smaller the period T is, the more data is obtained and the better the control effect is.

[0081] S43, determine T and T according to formula 6 i 、T d After obtaining the deviation value e at each moment, the operation value of each time period n is calculated. The processor calculates the operation value to realize fuzzy PID control.

[0082] During the calculation process, the intelligent control system continuously detects the variable values ​​of the environment, instantly obtains the deviation change rate, and then accurately controls the temperature inside the pizza oven through fuzzy control to achieve control of the controller parameter values.

[0083] The intelligent control system of this light wave hot air pizza oven is highly intelligent. When using the light wave and hot air mixed heating mode, it can accurately find the best intervention point of light wave heating to achieve high-quality pizza baking. First, the pizza is heated slowly at a low temperature through hot air heating to ensure that the pizza is heated evenly. Then, the best intervention point of light wave heating is accurately found, and light wave heating is used to quickly heat the pizza crust, so that the middle part of the pizza with material remains soft and glutinous while achieving a crispy effect on the crust, greatly improving the quality of pizza baking, and can effectively reduce energy consumption, realize the best heating strategy for pizza, optimize energy consumption, and reduce pizza baking time. It only takes 4-8 minutes to bake a pizza, which greatly shortens the pizza baking time.

[0084] The above description is only a preferred embodiment of the present invention, but the present invention should not be limited to the contents disclosed in the embodiment and the drawings. Therefore, any equivalent or modification completed without departing from the spirit disclosed in the present invention shall fall within the scope of protection of the present invention.

Claims

1. A light wave hot air pizza oven intelligent control system, characterized in that include: The light wave heating module, hot air module, temperature sensor, humidity sensor and intelligent control module installed in the light wave hot air pizza oven are electrically connected to the light wave heating module, hot air module, temperature sensor and humidity sensor respectively. The intelligent control module operates as follows: S1, system initialization; S2. According to the set initialization parameters, the hot air module is driven to heat the pizza oven, and the temperature sensor and humidity sensor are called to collect temperature and humidity. S3, calculating the optimal temperature T1 when the light wave heating module is involved; S4. When the temperature sensor detects that the pizza has been heated to the optimal intervention temperature T1, the PID calculation program is called to control the light wave heating module to intervene, so that the light wave hot air pizza oven quickly reaches the set target temperature T2 and quickly heats the pizza crust; In step S3, the optimal temperature T1 when the light wave heating module is involved is calculated as follows: S31. According to Newton's law of cooling, when an object is exposed to hot air, its surface temperature will gradually approach the temperature of the hot air over time. The formula for calculating the change in the object's surface temperature is as follows: ； Where, T(t) is the temperature of the material at time t, T 环境 is the temperature of hot air, T 初始 is the initial temperature of the material, k is a positive constant that depends on the properties of the material and the hot air, and t is the heating time; S32. A regression equation was established with drying time as an influencing factor. The drying time and process parameter optimization equation was: ； In formula 2, is the drying time for the material surface to rise from temperature T1 to target temperature T2 during the light wave heating process, min; X1 is the light wave temperature control temperature, °C; X2 is the drying time per cycle, min; X3 is the temperature difference, i.e. T2-T1, °C; S33. The light wave tube in the light wave heating module converts electrical energy into thermal energy. The electrothermal equivalent is calculated from the electric power: ； In formula 3, Q is the heat generated by the resistor when it is energized, in J, U is the operating voltage across the resistor, in V, and Rt is the resistance of the resistor in the operating state, in Ω; According to Joule's law, the electric power P required for thermoelectricity is calculated according to Formula 4: ； S34. Based on the required total electrical power P, the system can accurately calculate the time required for the light wave heating process according to formula 3 and formula 4 , and then reversely calculate the temperature difference X3 according to formula 2. Since the target temperature T2 is known, the material surface temperature T1 can be accurately calculated. This is the best time to intervene with light wave heating.

2. The light wave hot air pizza oven intelligent control system according to claim 1, characterized in that: In step S4, the process of calling the PID calculation program to control the light wave heating module to intervene is as follows: S41, determine the fuzzy PID control formula: ； Among them, △P is the output value of the PID algorithm result; K P is the proportional coefficient; e is the deviation; T i is the integration constant; T d is a differential constant; t is the current moment, which is a continuous variable; S42, according to the discrete calculation formula ; in, is the input signal of the signal sampler. When t=0, the sampler is closed for T seconds. The smaller the period T is, the more data is obtained and the better the control effect is. S43, determine T and T according to formula 6 i 、T d After obtaining the deviation value e at each moment, the operation value of each time period n is calculated. The processor calculates the operation value to realize fuzzy PID control.

3. A light wave hot air pizza oven, characterized in that include: The light wave hot air pizza oven intelligent control system as described in any one of claims 1-2 further includes a movable shelf box, a light wave hot air oven is installed on the top of the movable shelf box, a pizza conveyor device passes through the left and right sides of the light wave hot air oven horizontally, a control box is installed on one side of the light wave hot air oven, and a control panel is installed on the control box.

4. The light wave hot air pizza oven according to claim 3, characterized in that: The light wave hot air furnace includes an outer box body, an inner box body is installed in the outer box body, and the light wave heating module, hot air module, temperature sensor, and humidity sensor are all installed in the inner box body. The hot air module includes a fan installed on the top of the inner box body and arranged vertically downward, and an annular electric heating tube is installed on the periphery of the fan blades at the front end of the fan. A uniform wind hole plate is installed on the top of the inner box body below the annular electric heating tube, and uniform wind holes are evenly opened on the surface of the uniform wind hole plate; the light wave heating module includes a plurality of upper carbon fiber light wave tubes installed in the inner box body and below the uniform wind hole plate, and a plurality of lower carbon fiber light wave tubes installed at the bottom of the inner box body. The pizza conveying device passes through the left and right sides of the inner box body of the light wave hot air furnace in the horizontal direction and is located between the upper carbon fiber light wave tube and the lower carbon fiber light wave tube.

5. The light wave hot air pizza oven according to claim 4, characterized in that: The pizza conveying device includes a frame, which is fixedly installed on the top of the mobile shelf box. A driving roller and a passive roller are respectively installed on the left and right ends of the frame. A plurality of chain transmission gears are correspondingly installed on the driving roller and the passive roller. A ring transmission chain is installed between the corresponding chain transmission gears. The conveying motor is installed on one side of the driving roller and connected to the transmission shaft of the driving roller.

6. The light wave hot air pizza oven according to claim 5, characterized in that: A support and protection frame is installed between the upper carbon fiber light wave tube and the lower carbon fiber light wave tube in the inner box of the light wave hot air furnace. The upper end of the annular transmission chain passes above the support and protection frame, and the lower end of the annular transmission chain passes below the support and protection frame.

7. The light wave hot air pizza oven according to claim 4, characterized in that: The back plate of the outer box body is evenly provided with heat dissipation holes, and two parallel and spaced heat dissipation fans are installed on the top of the back plate. One end of the exhaust pipe is installed on the back plate, and the other end of the exhaust pipe extends into the inner box body.

8. The light wave hot air pizza oven according to claim 3, characterized in that: A shelf is arranged in the movable shelf box, and a plurality of universal wheels are arranged at the bottom of the movable shelf box.

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