Electromagnetic chamber assembly, electromagnetic heating control method, metal meal box for electromagnetic coil heating, food cooking apparatus and food vending apparatus

Abstract

The present invention relates to an electromagnetic chamber assembly, an electromagnetic heating control method, a metal meal box for electromagnetic coil heating, a food cooking apparatus and a food vending apparatus. The electromagnetic chamber assembly comprises: a heating chamber, which comprises a heating cavity used for containing a metal meal box, the metal meal box comprising at least one planar part and at least one bending part, and the heating chamber being configured to enable the metal meal box to turn over in a heating process; and a coil, configured to wind around the heating chamber, the heating chamber and the coil being configured to reduce the difference between the magnetic fields formed by the planar part and the bending part of the metal meal box so as to uniformly heat food in the metal meal box. When the electromagnetic chamber assembly is applied to food heating scenarios, food can be loaded into the meal box made of a metal material, and then the meal box is placed in the heating cavity in the heating chamber, such that the meal box is heated by means of the magnetic fields generated by the coil; as the difference between the magnetic fields formed by the coil winding around the heating chamber in the planar part and the bending part of the metal meal box is relatively small, the food in the meal box can be uniformly heated.

Description

An electromagnetic bin assembly and electromagnetic heating control method, a metal lunch box for electromagnetic coil heating, a food cooking device, and a food vending device Technical Field

[0001] The present application relates to the field of electromagnetic heating technology, and more specifically, to an electromagnetic chamber assembly and a control method for electromagnetic heating, a metal lunch box for electromagnetic coil heating, a food cooking device, and a food vending device. Background Art

[0002] Electromagnetic heating, also known as electromagnetic induction heating (IH), is a heating technology. It works by generating an alternating magnetic field through components of an electronic circuit board. When a metal container is placed in this magnetic field, alternating currents (eddy currents) are generated within the container due to the cutting of the alternating magnetic field lines. These eddy currents cause carriers at the bottom of the container to move at high speeds and irregularly. The collision and friction between these carriers and atoms generates heat energy, which in turn produces the heating effect. Electromagnetic heating fundamentally improves the low thermal efficiency of traditional resistive heating methods, such as heaters and coils.

[0003] The Chinese patent application with application number 202320979666.0 and filing date April 21, 2023, filed by Shenzhen Weichu Technology Co., Ltd., discloses an "electromagnetic heating device," which includes a heating chamber disposed within the device body for placing a lunch box, and a plurality of coil winding grooves disposed on the back side of the inner wall of the heating chamber for winding a coil, the coil being wound on the coil winding grooves and electrically connected thereto. The inventors of this application have discovered that there are still some technical problems that need to be solved when an automatic cooking machine adopts electromagnetic heating. Summary of the Invention

[0004] In response to the technical problems existing in the prior art, the present invention proposes an electromagnetic bin assembly, comprising: a heating bin, which includes a heating cavity for accommodating a metal lunch box, wherein the metal lunch box includes at least one planar portion and at least one bent portion, wherein the heating bin is configured so that the metal lunch box flips during the heating process; and a coil, which is configured to be wound around the heating bin; wherein the heating bin and the coil are configured to reduce the difference in magnetic fields formed on the planar portion and the bent portion of the metal lunch box, so as to uniformly heat the food in the metal lunch box.

[0005] The electromagnetic chamber assembly as described above, wherein the heating chamber includes a winding drum configured to provide a plurality of wire slots for winding the coil.

[0006] One or more electromagnetic chamber assemblies as described above, wherein the winding reel includes a shell, the inner wall of the shell is used to cover the surface of the heating chamber, the outer wall of the shell includes a first area and a second area, the first area is provided with a winding groove, the second area is not provided with a winding groove or the second area is provided with a winding groove but the groove spacing is greater than the winding groove in the first area, the shell has a bending portion, and the second area at least covers the bending portion.

[0007] As described above, in one or more electromagnetic chamber components, the first region and the second region are adjacent to each other; preferably, the first region is distributed around the second region.

[0008] As described above, one or more electromagnetic chamber assemblies, the shell includes a first plate body corresponding to the top or bottom surface of the heating chamber and a second plate body corresponding to the side surface of the heating chamber, and the bending portion is located at the junction of the first plate body and the second plate body.

[0009] In the one or more electromagnetic chamber assemblies as described above, the first plate body and the second plate body are both flat plate structures.

[0010] As described above, in one or more electromagnetic chamber assemblies, the extension direction of the bending portion is the first direction, and the ratio of the size of the area of ​​the bending portion covered by the second area in the first direction to the size of the shell in the first direction is in the range of [0.5, 1].

[0011] As described above, for one or more electromagnetic magazine assemblies, the slot spacing of the winding slots in the second area decreases along a direction perpendicular to the extension direction of the bending portion and away from the bending portion.

[0012] As described above, one or more electromagnetic chamber assemblies, the second area is provided with a through hole penetrating the shell.

[0013] As described above, in one or more electromagnetic chamber assemblies, the second area covers the bending portion and the area near the bending portion.

[0014] As described above, in one or more electromagnetic chamber assemblies, a portion of the outer wall of the shell located in the first area has a raised portion, and the raised portion is close to the bent portion.

[0015] As described above, in one or more electromagnetic chamber assemblies, the inner wall of the first plate body corresponding to the first area includes a first inner wall and a second inner wall, the first inner wall is used to contact and cooperate with the heating chamber, and the second inner wall is used to cooperate with the heating chamber with a gap.

[0016] As described above, one or more electromagnetic chamber components are provided with a plurality of side-by-side winding grooves corresponding to the second inner wall along the direction close to the bending portion, and the bottoms of the plurality of side-by-side winding grooves gradually move away from the first inner wall along the direction close to the bending portion.

[0017] As for the one or more electromagnetic magazine assemblies described above, a winding groove is provided in the second area, and the winding groove in the first area is connected to the winding groove in the second area.

[0018] As described above, in one or more electromagnetic chamber assemblies, the shell is a solid non-metallic structural part, preferably a high-temperature resistant plastic structural part.

[0019] As described above, the one or more electromagnetic chamber assemblies, the shell is U-shaped and has two bending parts.

[0020] In the one or more electromagnetic chamber assemblies as described above, the coil is embedded in the winding groove.

[0021] As described above, one or more electromagnetic chamber assemblies, the heating chamber has a corner, and the corner is arranged corresponding to the bending portion; the angle of the inner wall of the shell at the bending portion is smaller than the angle at the corner position of the heating chamber, so that there is a gap between the shell and the heating chamber at the corner position.

[0022] As described above, one or more electromagnetic chamber components, the top and bottom of the inner side of the heating chamber are provided with microcrystalline panels.

[0023] As described above, one or more electromagnetic chamber components, the heating chamber includes a first chamber body and a second chamber body, and the first chamber body and the second chamber body form the heating chamber; the first chamber body and the second chamber body are each connected to one of the winding reels.

[0024] As described above, in one or more electromagnetic bin assemblies, the first bin body is integrally connected to one of the winding reels, and the second bin body is integrally connected to another of the winding reels.

[0025] As described above, one or more electromagnetic chamber assemblies, the heating chamber is a non-metallic structural part.

[0026] As described above, one or more electromagnetic chamber assemblies are connected to the mounting frame in a relatively rotatable manner, and the mounting frame is further connected to a driving device for driving the electromagnetic chamber assembly to rotate.

[0027] The one or more electromagnetic chamber assemblies as described above include an induction plate fixedly arranged relative to the heating chamber and a first induction device fixedly arranged relative to the mounting frame. The induction plate can trigger the first induction device to determine whether the heating chamber has been rotated by a preset angle.

[0028] As described above, one or more electromagnetic chamber assemblies, the output shaft of the driving device is connected to a driving wheel, the heating chamber is connected to a driven wheel, and the driving wheel and the driven wheel are connected by a transmission belt; the induction plate is arranged on the driven wheel, and the first induction device is installed on the mounting frame.

[0029] As described above, one or more electromagnetic bin assemblies, the transmission belt is provided with an accessory, and the mounting frame is provided with a second sensing device. The accessory can move with the transmission belt to the sensing position of the second sensing device, and the second sensing device is connected to the drive device signal. The second sensing device is configured to send a signal to cause the drive device to rotate in the opposite direction when it detects that the accessory moves to the sensing position.

[0030] As for one or more electromagnetic bin assemblies as described above, a bin door is also provided on the mounting frame, and the bin door can selectively cover the opening of the heating chamber. A protrusion is connected to the side of the bin door facing the heating chamber, and a limiting structure is provided in the heating bin. The limiting structure and the protrusion are used to limit the lunch box from two opposite sides of the lunch box.

[0031] As described above, in one or more electromagnetic chamber assemblies, the protrusion is rotatably connected to the chamber door, and the rotation axis coincides with the rotation axis of the heating chamber.

[0032] One or more electromagnetic chamber components as described above also include a control board, which is provided with a processing unit and a control circuit connected to the processing unit. The first sensing device, the second sensing device and the driving device are all connected to the processing unit through the control circuit signal.

[0033] One or more electromagnetic chamber components as described above, wherein the processing method after power failure includes the following steps: S1: restoring the power supply of the electromagnetic heating module; S2: the processing unit sends a signal to the driving device to make the transmission belt move along a preset direction; S3: when the accessory triggers the second sensing device, the second sensing device sends a signal to the processing unit, and at this time, the processing unit sends a signal to the driving device to make the driving device reverse and work according to a preset program.

[0034] One or more electromagnetic bin assemblies as described above, wherein the heating bin includes: a bin body, which has a heating cavity for placing a lunch box; a wire winding reel, which is installed on the side of the bin body, the inner wall of the wire winding reel covers the side of the bin body, and the outer wall of the wire winding reel is provided with a wire groove for arranging the wires, so as to achieve heating of the lunch box placed in the bin body; wherein the wire winding reel has a first area, and a plurality of first-type wire grooves are provided in the first area, the first-type wire grooves include straight wire grooves and arc-shaped wire grooves connected to the straight wire grooves, the straight wire grooves are arranged to extend in a straight line along a first direction, and the straight wire grooves are spaced apart along a second direction, the arc-shaped wire grooves are arranged to extend in an arc-shaped manner along the second direction, and the arc-shaped wire grooves are spaced apart along the first direction, so that the wires arranged in the first-type wire grooves are arranged in a plurality of runway shapes spaced apart from the inside to the outside; the first direction is approximately perpendicular to the second direction.

[0035] As described above, one or more electromagnetic chamber components, the winding reel also has a second area, which is located in the first area; a plurality of second-type wire grooves are provided in the second area, and the second-type wire grooves are arranged as circular rings spaced and coaxially distributed from the inside to the outside, so that the wires arranged in the second-type wire grooves are arranged in a plurality of circular rings; wherein the second-type wire grooves are connected to the first-type wire grooves, so that the wires are wound through the second-type wire grooves in turn and then enter the first-type wire grooves for winding.

[0036] As for the one or more electromagnetic chamber components described above, the connection between the arc-shaped wire groove and the straight wire groove is set as an arc transition, and the radius of the arc is set to 8-24% of the straight wire groove of the same ring.

[0037] As described above, one or more electromagnetic bin assemblies, the depth of the second type of wire trough is greater than the depth of the first type of wire trough, so that the number of wire layers arranged in the second type of wire trough is greater than the number of wire layers in the first type of wire trough; and / or, the depth of the straight wire trough gradually decreases from the inside to the outside along the second direction, so that the number of wire layers arranged in the straight wire trough is correspondingly reduced.

[0038] As described above, one or more electromagnetic chamber components, the winding reel includes a first side plate and two second side plates respectively connected to the two sides of the first side plate, and the angle between the second side plate and the first side plate is set to be an obtuse angle; wherein the first area and the second area are located on the first side plate; a hollow is provided at the connection between the first side plate and the second side plate, and the hollow is used for heat dissipation.

[0039] One or more electromagnetic bin assemblies as described above further include: a magnetic isolation layer located between the winding drum and the bin body; the magnetic isolation layer includes a magnetic core or a magnetic isolation member, and the length of the magnetic isolation layer is set to 5-35% of the length of the winding drum.

[0040] One or more electromagnetic bin assemblies as described above also include: a temperature equalizing member, which is connected to the inner wall of the bin body, and the other side of the temperature equalizing member is away from the bin body and is in contact with the lunch box; the thermal conductivity coefficient of the temperature equalizing member is set to be above 5W / (K*m); the temperature equalizing member includes a first temperature equalizing plate, the first temperature equalizing plate is connected to the first side plate, and the thickness of the first temperature equalizing plate is adjusted according to the size of the lunch box.

[0041] The one or more electromagnetic chamber components as described above include: a frame; a driving component installed on the frame, and the driving component is connected to the power input end of the chamber body to drive the electromagnetic heating chamber component to rotate.

[0042] As described above, one or more electromagnetic bin assemblies, the driving assembly includes: a motor, a driving wheel, a driven wheel and a transmission member connected to the motor, the transmission member is sleeved on the driving wheel and the driven wheel, and the driven wheel is connected to the power input end of the bin body; the electromagnetic heating device also includes: a first detection assembly, which is used to detect whether the lunch box placed in the bin body is in a horizontal position, and to detect the number of rotations of the bin body; the first detection assembly includes a first sensor and a first induction member, the first sensor is mounted on the frame, and the first induction member is mounted on the driven wheel; the first induction member is close to the first sensor so that the first sensor detects a signal; the second detection assembly is used to detect whether the number of rotations of the bin body exceeds a preset range to prevent the cables connecting the wires in the wire trough from being excessively entangled; the second detection assembly includes a second sensor and a second induction member, the second sensor is mounted on the frame, and the second induction member is mounted on the transmission member; the second induction member is close to the second sensor, and the second sensor detects a signal to stop the motor from rotating.

[0043] In some embodiments, a wire groove for accommodating and fixing the wire is provided on the winding reel, and the wire is wound multiple times in the first wire groove along the straight wire groove and the arc-shaped wire groove in sequence to form a coil, thereby presenting a runway-shaped coil. In this way, the runway-shaped coil can not only cover a larger heating area on the top or bottom surface of the lunch box, but also avoid the generation of low-temperature areas on the diagonal line of the rectangular heating surface, and avoid the generation of obvious high-temperature points, thereby effectively improving the uniformity of the electromagnetic coil heating the rectangular surface, and preventing uneven heating from causing local sticking of the pot.

[0044] According to another aspect of the present invention, there is provided a food cooking device comprising one or more electromagnetic chamber assemblies as described above.

[0045] According to another aspect of the present invention, a food vending device includes one or more electromagnetic bin assemblies as described above.

[0046] According to another aspect of the present invention, a method for controlling electromagnetic heating is provided, comprising: placing a metal lunch box into a heating chamber, wherein the heating chamber uses an electromagnetic coil to heat the metal lunch box, and the metal lunch box contains ingredients to be cooked; starting the heating chamber to execute a cooking process; and controlling multiple parameters during the cooking process in the heating chamber to ensure the safety and accuracy of the cooking process.

[0047] The method as described above further includes: obtaining a cooking process; obtaining a category of ingredients to be cooked based on the obtained cooking process; obtaining an initial temperature inside the heating chamber; comparing the obtained initial temperature inside the chamber with a set reference temperature; obtaining a temperature compensation strategy based on the comparison result between the initial temperature inside the chamber and the set reference temperature and the category of ingredients to be cooked; and sending the cooking process and the temperature compensation strategy to the corresponding heating chamber so that the heating chamber executes the cooking process and the temperature compensation strategy.

[0048] One or more methods as described above, the temperature compensation strategy is obtained based on the comparison result between the initial temperature in the warehouse and the set reference temperature and the category of the food to be cooked, including: obtaining a temperature difference based on the initial temperature in the warehouse and the set reference temperature; determining the duration of adjusting the input power of the heating warehouse based on the temperature difference and the temperature compensation coefficient; wherein the temperature compensation coefficient is set according to the category of the food to be cooked and adjusted according to the temperature of the food after cooking; obtaining a first power difference based on the input power after adjustment and the input power before adjustment; and determining a first energy for compensating the heating warehouse based on the first power difference and the duration.

[0049] One or more methods as described above, wherein the first power difference is obtained based on the input power after adjustment and the input power before adjustment, including: if the initial temperature inside the warehouse body is lower than the set reference temperature, then increasing the input power of the heating warehouse to compensate for the added energy of the heating warehouse; if the initial temperature inside the warehouse body is higher than the set reference temperature, then decreasing the input power of the heating warehouse to compensate for the reduced energy of the heating warehouse.

[0050] One or more methods as described above also include: obtaining the real-time average power of the electromagnetic coil heating in the first time period; comparing the real-time average power with the current input power; obtaining a power correction strategy based on the comparison result of the real-time average power and the current input power; and dynamically adjusting the current input power of the electromagnetic coil heating according to the power correction strategy.

[0051] As described above, one or more methods, the real-time average power of the electromagnetic coil heating in the first time period is obtained, including: obtaining the current value and voltage value of the electromagnetic coil heating in the first time period, calculating the current value and voltage value of the electromagnetic coil heating according to a preset interval frequency to obtain the real-time synthetic power of the electromagnetic coil heating; calculating the real-time synthetic power by weighted average or moving weighted average to obtain the real-time average power.

[0052] One or more methods as described above, the power correction strategy is obtained based on the comparison result of the real-time average power and the current input power, including: obtaining a second power difference between the current input power and the real-time average power; obtaining a corrected power based on the current input power and the second power difference; inputting the corrected power so that the electromagnetic coil of the heating chamber is heated according to the corrected power.

[0053] In some embodiments, by comparing the initial temperature inside the chamber with the set reference temperature, a temperature compensation strategy is implemented to increase or decrease the power of the electromagnetic coil of the heating chamber, so that the initial temperature inside the chamber can reach the set reference temperature. In this way, during the cooking process, there will be no difference in the total energy absorbed by the food, and inconsistent temperatures of the food after cooking can be avoided, thereby achieving consistent controllable heating of the food, thereby improving the taste of the cooked food and further improving the user experience.

[0054] In some embodiments, a current and voltage monitoring circuit board is provided in the vending machine to collect power data during the electromagnetic heating process of the heating chamber. The heating power of the electromagnetic coil can be monitored in real time, and the real-time average power can be calculated by moving weighted average or weighted average. The real-time average power is compared with the current input power, and the current input power is dynamically adjusted according to the comparison result to achieve power closed-loop control. In this way, within a certain power adjustment range, the voltage fluctuation of the power supply system can be avoided, which causes large power changes, thereby improving the consistency of the cooked food; at the same time, it can compensate for the differences in the power output modules and keep the heating power of the electromagnetic coil stable.

[0055] In some embodiments, by real-time monitoring of the heating power of the electromagnetic coil, the real-time average power is compared with a preset safety threshold, and based on the comparison strategy, it can be determined whether there is a risk of the lunch box melting through. In this way, the risk of the lunch box melting through can be discovered in time. At this time, the electromagnetic coil can be controlled to stop heating, and the heating chamber can be controlled to stop working, and the frying is ended. Therefore, even if the wall thickness of the aluminum foil box is thin and the heating power is too large, especially when heating solid or semi-fluid ingredients, the aluminum foil box is not easy to melt through.

[0056] One or more methods as described above further include: obtaining the current value and voltage value of the electromagnetic coil heating in the first time period, calculating the current value and voltage value of the electromagnetic coil heating according to a preset interval frequency to obtain the real-time synthetic power of the electromagnetic coil heating; calculating the real-time synthetic power to obtain the real-time average power; comparing the real-time average power with the preset safety threshold, and judging whether there is a risk of the lunch box melting through based on the comparison strategy; when it is determined that there is a risk of the lunch box melting through, controlling the electromagnetic coil to stop heating.

[0057] As described above, one or more methods compare the real-time average power with the preset safety threshold, and judge whether there is a risk of the lunch box melting through based on the comparison strategy, including: if the real-time average power is higher than the preset safety threshold, then determine that the heating is abnormal, and record and accumulate the number of heating abnormalities in the first time period; judge whether the accumulated number of heating abnormalities is greater than the set threshold; if the accumulated number of heating abnormalities is greater than the set threshold, then determine that there is a risk of the lunch box melting through.

[0058] As described above, one or more methods, the current value and voltage value of the electromagnetic coil heating in the first time period are obtained, and the current value and voltage value of the electromagnetic coil heating are calculated according to a preset interval frequency to obtain the real-time synthetic power of the electromagnetic coil heating, including: calculating the current value and voltage value of the electromagnetic coil heating once every 50-300ms.

[0059] In some embodiments, by real-time monitoring of the heating power of the electromagnetic coil, the real-time average power is compared with a preset safety threshold, and based on the comparison strategy, it can be determined whether there is a risk of the lunch box melting through. In this way, the risk of the lunch box melting through can be discovered in time. At this time, the electromagnetic coil can be controlled to stop heating, and the heating chamber can be controlled to stop working, and the frying is ended. Therefore, even if the wall thickness of the aluminum foil box is thin and the heating power is too large, especially when heating solid or semi-fluid ingredients, the aluminum foil box is not easy to melt through.

[0060] According to another aspect of the present invention, a metal lunch box for electromagnetic coil heating is provided, comprising: a box body made of aluminum foil and provided with a receiving cavity for storing ingredients to be cooked; the box body comprises a bottom and side walls connected to the bottom, and the angle between the side walls and the horizontal plane where the bottom is located is set to an obtuse angle; the wall thickness of the box body is set to 0.05 mm-0.3 mm.

[0061] The metal lunch box for electromagnetic coil heating as described above is suitable for heating using one or more of the methods described above.

[0062] As described above, for one or more metal lunch boxes for electromagnetic coil heating, preferably, the wall thickness of the box body is set to 0.08mm-0.15mm.

[0063] As described above, one or more metal lunch boxes for electromagnetic coil heating, the side walls include a first side wall and a second side wall, and the two sides of the first side wall are respectively connected to the bottom and the second side wall; wherein the angle between the first side wall and the horizontal plane where the bottom is located is smaller than the angle between the second side wall and the horizontal plane where the bottom is located.

[0064] For one or more metal lunch boxes for electromagnetic coil heating as described above, the angle between the first side wall and the horizontal plane where the bottom is located is set to 95-105 degrees; the angle between the second side wall and the horizontal plane where the bottom is located is set to 98-110 degrees.

[0065] When the electromagnetic coil is used to heat the box body of the one or more metal lunch boxes for electromagnetic coil heating as described above, the inductance is set to 30-200 μH and the frequency is set to 10-50 kHz.

[0066] In one or more metal lunch boxes for electromagnetic coil heating as described above, the ingredients to be cooked include solid ingredients or semi-fluid ingredients; wherein the semi-fluid ingredients are a mixture of solid and liquid, and the solid and liquid can be separated from each other; or, the semi-fluid ingredients are a mixture of solid and liquid that cannot be separated; and the proportion of the liquid mass in the semi-fluid ingredients to the total mass is less than 30%.

[0067] In some embodiments, the side walls of the box body are set to be slightly inclined outward to increase the volume of the accommodating cavity, so that more food can be stored; compared with the lunch box whose side walls are perpendicular to the bottom, the aluminum foil box is less deformed by the stored food; and by setting a reasonable box body wall thickness, the aluminum foil box has better structural strength and is not easy to deform, and the production cost is low. When the electromagnetic coil is used to directly heat the box body, the heating effect of the food is better, which can avoid the phenomenon of the cooked food becoming mushy during the heating process, and can increase the heating speed of the box body. The box body can realize heat transfer to improve the heating speed and heating effect of the food, thereby improving the heating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Below, the preferred embodiments of the present invention will be further described in detail with reference to the accompanying drawings, in which:

[0069] FIG1 is a schematic structural diagram of an electromagnetic heating module provided in an embodiment of the present application from a first viewing angle;

[0070] FIG2 is a schematic structural diagram of an electromagnetic heating module provided in an embodiment of the present application from a second viewing angle;

[0071] Figure 3 is an overall cross-sectional view of the lunch box after it is placed in the electromagnetic heating module;

[0072] FIG4 is a schematic structural diagram of an electromagnetic chamber assembly provided in an embodiment of the present application;

[0073] FIG5 is a schematic diagram of the corner position of the heating chamber provided in an embodiment of the present application;

[0074] FIG6 is a schematic structural diagram of a first storage body connected to a winding drum assembly;

[0075] FIG7 is a top view of the structure shown in FIG4;

[0076] FIG8 is a cross-sectional view of the section AA in FIG7;

[0077] FIG9 is a partial enlarged view of point C in FIG8 ;

[0078] FIG10 is a cross-sectional view at BB in FIG7 ;

[0079] FIG11 is a top view of the structure shown in FIG10 ;

[0080] FIG12 is a schematic structural diagram of a winding reel assembly provided in an embodiment of the present application;

[0081] FIG13 is a schematic diagram of the three-dimensional structure of the winding drum provided in an embodiment of the present application;

[0082] FIG14 is a schematic cross-sectional view perpendicular to a first direction of a winding reel provided in an embodiment of the present application;

[0083] FIG15 is a bottom view of FIG14;

[0084] FIG16 is one of the configuration methods of the first area and the second area provided in an embodiment of the present application;

[0085] FIG17 is a second configuration method of the first area and the second area provided in an embodiment of the present application;

[0086] FIG18 is a third configuration method of the first area and the second area provided in an embodiment of the present application;

[0087] FIG19 is a fourth configuration method of the first area and the second area provided in an embodiment of the present application;

[0088] FIG20 is a fifth configuration method of the first area and the second area provided in an embodiment of the present application;

[0089] FIG. 21 is a sixth configuration method of the first area and the second area provided in an embodiment of the present application.

[0090] FIG22 is a schematic structural diagram of an electromagnetic heating chamber assembly provided in an embodiment of the present application;

[0091] FIG23 is a structural diagram 1 of a winding reel provided in an embodiment of the present application;

[0092] FIG24 is a structural diagram 2 of a winding reel provided in an embodiment of the present application;

[0093] FIG25 schematically shows the winding shape of the electromagnetic heating coil;

[0094] FIG26 schematically shows a schematic diagram of a magnetic field simulation of an electromagnetic heating coil;

[0095] FIG27 is a structural schematic diagram 1 of an electromagnetic heating chamber device provided in an embodiment of the present application;

[0096] FIG28 is a structural schematic diagram 2 of the electromagnetic heating chamber device provided in an embodiment of the present application;

[0097] FIG29 is a structural schematic diagram 3 of the electromagnetic heating chamber device provided in an embodiment of the present application.

[0098] Figure 30 is a schematic structural diagram of the heating chamber of an embodiment of the present application.

[0099] Figure 31 is a structural block diagram of a control device for electromagnetic heating provided in an embodiment of the present application.

[0100] Figure 32 is a flow chart of a control method for electromagnetic heating provided in an embodiment of the present application.

[0101] Figure 33 is a flow chart of another electromagnetic heating control method provided in an embodiment of the present application.

[0102] FIG34 is a flowchart of another electromagnetic heating control method provided in an embodiment of the present application.

[0103] Figure 35 is a schematic diagram of the processing process of an electromagnetic heating control method provided in an embodiment of the present application.

[0104] Figure 36 is a schematic diagram of the processing process of another electromagnetic heating control method provided in an embodiment of the present application.

[0105] Figure 37 is a schematic diagram of the processing process of another electromagnetic heating control method provided in an embodiment of the present application.

[0106] Figure 38 is a schematic diagram of the changes in the temperature and power curves of the aluminum foil box during the electromagnetic heating process provided in an embodiment of the present application.

[0107] Figure 39 is a structural block diagram of another electromagnetic heating control device provided in an embodiment of the present application.

[0108] FIG40 is a schematic structural diagram of an aluminum foil box for electromagnetic coil heating provided in an embodiment of the present application;

[0109] FIG41 is a schematic diagram showing the effect of the box after cooking;

[0110] FIG42 schematically shows the changing trend of the deformation of the aluminum foil box;

[0111] FIG43 is a schematic structural diagram of a heating chamber provided in an embodiment of the present application;

[0112] FIG44 is a flow chart 1 of a control method for electromagnetic coil heating provided in an embodiment of the present application;

[0113] FIG45 is a flow chart 2 of a control method for electromagnetic coil heating provided in an embodiment of the present application;

[0114] FIG46 is a schematic structural diagram of a control device for electromagnetic coil heating provided in an embodiment of the present application;

[0115] Figure 47 is a schematic diagram of an electronic device used to implement the control method of electromagnetic coil heating in an embodiment of the present application. DETAILED DESCRIPTION

[0116] This application claims priority from and is incorporated by reference into the present application by the following patent application:

[0117] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0118] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without making any creative efforts shall fall within the scope of protection of the present application.

[0119] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0120] In the description of this application, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0121] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0122] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0123] In some applications where electromagnetic heating is used, it is necessary to heat an object from multiple sides. Therefore, coils need to be set on multiple sides of the object to heat the object. For example, in some applications, electromagnetic heating is used to heat a roughly rectangular metal lunch box containing food. The heating chamber used for heating has a cavity that matches the shape of the lunch box, so that the heating chamber can drive the lunch box to rotate during rotation, thereby stirring the food. The inventors of this application discovered that at the intersection of two sides, the magnetic fields generated by different coils overlap, causing the magnetic field intensity near the intersection of the two sides to be too large, resulting in excessive energy concentration, resulting in uneven heating of the heated object, and the object being burned near the intersection of the two sides. For example, for a lunch box that is approximately rectangular, the intersection of the two sides can be understood as the edge of the lunch box, or the intersection of the two side panels to form a corner. That is, the magnetic fields generated by the coils used to heat the two sides of the lunch box at the corresponding intersection of the two sides overlap. For a lunch box that is approximately cylindrical, the position where the two side surfaces intersect can be understood as the position where the circumferential surface or conical surface of the lunch box intersects with the top or bottom plane to form a corner, that is, the magnetic fields generated by the coils for heating from the circumferential surface of the lunch box and from the bottom surface of the lunch box at the bottom corner of the lunch box are superimposed on each other.

[0124] For the convenience of explanation, the electromagnetic heating module 100 provided in an embodiment of the present application is taken as an example for explanation. As shown in Figures 1 to 3, the electromagnetic heating module 100 includes an electromagnetic chamber assembly 200 that adopts electromagnetic heating for heating. As shown in Figures 4 to 11, an electromagnetic chamber assembly 200 provided in an embodiment of the present application includes a heating chamber 300 and a winding disk assembly 400 shown in Figure 12. The winding disk assembly 400 includes a winding disk 500 and a coil arranged on the winding disk 500. Furthermore, the winding disk 500 has a winding groove 520, and the coil is embedded in the winding groove 520. The interior of the heating chamber 300 has a heating cavity 330 for accommodating the heated object. It should not be difficult for those skilled in the art to understand that the electromagnetic heating module 100 provided in the embodiment of the present application adopts electromagnetic heating to heat the object. When the electromagnetic heating module 100 is used in a scenario of heating food, the food can be put into a lunch box 600 made of metal material, and then the lunch box 600 can be placed in the heating cavity 330 inside the heating chamber 300, so that the magnetic field generated by the coil can be used to make the lunch box 600 heat up, thereby heating the food in the lunch box 600.

[0125] Furthermore, some embodiments provide a heating chamber 300 comprising a first chamber body 310 and a second chamber body 320, which are connected to each other to form a heating chamber 330. Accordingly, some embodiments provide an electromagnetic chamber assembly 200 comprising two wire winding drums 500, which are mounted on the outer surface of the heating chamber 300 from both sides thereof. In the embodiments of the present application, there is no particular limitation on the corresponding connection relationship between the wire winding drums 500 and the first chamber body 310 and the second chamber body 320 in the heating chamber 300. For example, in one embodiment, one wire winding drum 500 may be completely mounted on the first chamber body 310, and the other wire winding drum 500 may be completely mounted on the second chamber body 320. In this embodiment, a wire winding drum 500 may be first mounted on each of the first chamber body 310 and the second chamber body 320, and then the first chamber body 310 and the second chamber body 320 may be connected to form the heating chamber 300. In other embodiments, the two wire winding drums 500 may each be connected to the first bin body 310 at one portion and to the second bin body 320 at the other portion. In this embodiment, the first bin body 310 and the second bin body 320 are often connected to form the heating bin 300 first, and then the two wire winding drums 500 are connected to the outside of the heating bin 300. Furthermore, in the embodiments of the present application, there is no particular limitation on the connection method between the wire winding drum 500 and the heating bin 300. In some embodiments, the wire winding drum 500 may be bonded to the first bin body 310 or integrally formed. Accordingly, the wire winding drum 500 and the first bin body 310 may both be made of non-metallic structural parts, such as high-temperature resistant plastic or ceramic materials.

[0126] In an embodiment of the present application, the structure of the first warehouse body 310 may be the same as or different from the structure of the second warehouse body 320, and the structure of the winding drum 500 connected to the first warehouse body 310 may be the same as or different from the structure of the winding drum 500 connected to the second warehouse body 320.

[0127] As shown in Figures 8 and 10 , some embodiments provide a heating chamber 300 having a generally hexagonal cross-section, comprising a top surface, a bottom surface, and four side surfaces. The top surface and two side surfaces connected to the top surface are located in a first chamber body 310, while the bottom surface and two side surfaces connected to the bottom surface are located in a second chamber body 320. Corners 340 are formed at the junctions of the top surface and the side surfaces, and at the junctions of the bottom surface and the side surfaces.

[0128] Furthermore, some embodiments provide a winding reel 500 including a housing 510 having a winding groove 520 disposed thereon. The housing 510 also has a bend 517 corresponding to the corner 340 of the heating chamber 300. Winding grooves 520 are disposed on both sides of the bend 517. Specifically, the coil in the winding groove 520 disposed on one side of the bend 517 heats the object in the heating chamber 330 from the top or bottom of the heating chamber 300, while the coil in the winding groove 520 disposed on the other side of the bend 517 heats the object in the heating chamber 330 from the side of the heating chamber 300. Furthermore, microcrystalline panels 350 are disposed on the top and bottom of the interior of the heating chamber 300. The microcrystalline panels 350 are configured to contact the lunch box 600. The microcrystalline panels 350 have good thermal conductivity, facilitating uniform heat transfer from the bottom of the lunch box 600 and preventing the lunch box 600 from overheating instantaneously, thereby heating the food more evenly. There is no particular limitation on the connection method between the microcrystalline panel 350 and the heating chamber 300, and a high-temperature resistant colloid can be used for bonding. In the embodiment of the present application, the housing 510 is preferably made of a material with insulating properties, such as a plastic material, or can be made of other solid non-metallic materials with insulating properties.

[0129] Furthermore, in some embodiments, the shell 510 includes an inner wall and an outer wall, wherein the inner wall is the surface of the shell 510 facing the heating chamber 300 after the shell 510 is installed in the heating chamber 300, and correspondingly, the outer wall is the surface facing away from the heating chamber 300, and the winding groove 520 is arranged on the outer wall of the shell 510.

[0130] The heating chamber assembly provided in the above embodiment includes a winding drum 500 having winding grooves 520 on both sides of a bend 517. By providing coils in the winding grooves 520 on both sides of the bend 517, heating of an object can be achieved from different sides of the heating chamber 300. Therefore, the magnetic fields generated by the coils on both sides of the bend 517 are superimposed near the bend 517. It is readily understood that the coils are wound from a single or multiple wires 700.

[0131] Furthermore, in some embodiments of the winding reel 500, as shown in Figures 16 to 21, the outer wall includes a first area 511 and a second area 512, the first area 511 is provided with a first winding groove 521, and the second area 512 is not provided with a winding groove 520, or the second area 512 is provided with a second winding groove 522, but the groove spacing of the second winding groove 522 in the second area 512 is greater than the groove spacing of the first winding groove 521 in the first area 511. It is not difficult to understand that the larger the groove spacing, the fewer the number of winding grooves 520 per unit area, and thus the fewer coils that can be set per unit area. That is, the winding density of the coil installed on the winding reel 500 is greater in the first area 511 and less in the second area 512. Accordingly, in some embodiments, the first area 511 is provided with a first coil, the second area 512 is not provided with a coil, or the second area 512 is provided with a second coil, and the winding density of the second coil is less than the winding density of the first coil.

[0132] Furthermore, the second region 512 at least covers the bent portion 517 of the housing 510. It should be noted that the second region 512 covering the bent portion 517 means that part of the second region 512 is located at the bent portion 517, not that the bent portion 517 is completely located within the second region 512.

[0133] Furthermore, in some embodiments, the coil disposed in the first winding groove 521 is used to heat the object in the heating chamber 300 from the top surface of the heating chamber 300; when the second winding groove 522 covers the bend 517, the coil in the second winding groove 522 can heat the object in the heating chamber 300 from the bend 517; in some embodiments, as shown in FIG16 , the coil in the second winding groove 522 can also heat the object in the heating chamber 300 from the top and side surfaces of the heating chamber 300. It is not difficult to understand that by disposing the second winding groove 522 with a smaller distribution density in the second area 512 of the winding drum 500 and making the second area 512 cover the bend 517, the winding density of the coil at the bend 517 of the housing 510 is smaller after the coil is disposed in the winding drum 500. Therefore, the magnetic field strength generated by the coil at the corner 340 of the heating chamber 300 can be reduced, thereby improving the problem of objects in the heating chamber 330 being overheated at the corner 340 and being burnt, thereby making the objects more evenly heated. In other embodiments, although the second region 512 covers the bend 517, no winding groove is provided at the bend 517. In other words, the second winding groove 522 in the second region 512 can heat the objects in the heating chamber 300 from the side.

[0134] When coils are installed in the winding slots 520 of the winding drum 500, the slot spacing can be understood as the distance between the conductor in one winding slot 520 and the conductor in another adjacent winding slot 520. When no coils are installed in the winding drum 500, the slot spacing can be understood as the distance between two slots on the winding drum 500 for mounting coils. For example, in embodiments where the winding slots 520 are separated by slot walls 530, the thicker the slot walls 530, the greater the slot spacing. It is easy to understand that the thicker the slot walls 530, the greater the spacing between adjacent winding slots 520, the fewer the number of winding slots 520 and coils per unit area, and the lower the coil winding density. The slot spacing can also be understood as the distance between adjacent slot walls 530. The greater the distance between the slot walls 530, the greater the slot spacing, the fewer the number of winding slots 520 per unit area, and the lower the coil winding density, even if the number and specifications of the conductors 700 installed in the winding slots 520 are the same.

[0135] The slot spacing between the first region 511 and the second region 512 provided in the above embodiment is different. Accordingly, the winding density of the coils in the first region 511 and the coils in the second region 512 is different. Therefore, the first region 511 and the second region 512 can each be provided with an independent coil. In this embodiment, the first region 511 and the second region 512 can be non-adjacent, or the first region 511 and the second region 512 can be adjacent, but the first winding slot 521 in the first region 511 and the second winding slot 522 in the second region 512 are not connected.

[0136] In other embodiments, the coils provided in the first region 511 and the second region 512 may be wound with a single wire or multiple wires connected in series, and the winding density of the wire decreases after the wire is wound from the first region 511 to the second region 512. In this embodiment, the first region 511 and the second region 512 may be provided adjacent to each other, and optionally, the first winding groove 521 in the first region 511 is connected to the second winding groove 522 in the second region 512, so that the wire in the first winding groove 521 in the first region 511 can be wound to the second winding groove 522 in the second region 512. As shown in FIG16 , the portion of the second region 512 covered by the bend 517 is provided with a second winding groove 522 extending perpendicular to the direction in which the bend 517 extends, and the second winding groove 522 is connected to the first winding groove 521 in the first region 511.

[0137] The extension direction of the bend 517 is defined as the first direction (i.e., the direction indicated by arrow A in FIG13 ). Furthermore, within the second region 512 , there are second winding grooves 522 extending parallel to the first direction. In a direction perpendicular to the first direction and away from the bend 517 (i.e., the direction indicated by arrows B and C in FIG13 ), the groove spacing between the second winding grooves 522 within the second region 512 increases. Specifically, it can be understood that the groove spacing between the second winding grooves 522 gradually increases, or it can be understood that the groove spacing increases to a certain value and remains unchanged. In this embodiment, the groove spacing of the second winding grooves 522 within the second region 512 is greater than the groove spacing of the first winding grooves 521 within the first region 511, which means that the minimum groove spacing of the second winding grooves 522 extending along the bend 517 within the second region 512 is greater than the maximum groove spacing of the first winding grooves 521 extending along the bend 517 within the first region 511.

[0138] Of course, as shown in Figure 16, there may also be a second winding groove 522 extending perpendicular to the first direction in the second area 512. Furthermore, the second winding groove 522 extending perpendicular to the first direction in the second area 512 may be extended to connect to the first winding groove 521 in the first area 511, or may simply connect two second winding grooves 522 extending parallel to the first direction in the second area 512.

[0139] Furthermore, in some embodiments, as shown in FIG16 , the first winding slots 521 within the first region 511 have equal slot spacing. A third region 513 is provided between the first region 511 and the second region 512. Third winding slots 523 are provided within the third region 513. Furthermore, the slot spacing within the third winding slots 523 can gradually vary. For example, the slot spacing of the third winding slots 523 closer to the first region 511 is smaller, while the slot spacing of the third winding slots 523 closer to the second region 512 is larger. This allows the winding density of the coils within the first region 511 to gradually change to the winding density of the coils within the second region 512, passing through the winding density of the coils within the third region 513. This allows the generated magnetic field strength to vary uniformly. The first winding slots 521, the second winding slots 522, and the third winding slots 523 are merely used to distinguish the winding slots 520 located in different regions.

[0140] Furthermore, in some embodiments, as shown in FIG17 , a third region 513 is provided between the first region 511 and the second region 512. Different numbers of wires 700 are arranged in the third winding slots 523 of the third region 513 so that the winding density is lower near the bend 517 and higher away from the bend 517. Within the third region 513, the number of wires 700 in the third winding slots 523 gradually increases in a direction perpendicular to the direction of extension of the bend 517 and away from the bend 517 (i.e., from the bend 517 toward the first region 511). Specifically, as shown in FIG17 , the number of wires 700 in the third winding slots 523 increases from one to two. The number of wires 700 in the first winding slots 521 in the first region 511 is three, while the number of wires 700 in the second winding slots 522 in the second region 512 is two. In some other embodiments, the number of the wires 700 in the second winding slot 522 may also change gradually.

[0141] In the above-mentioned embodiments, winding grooves 520 are provided in the second region 512. In other embodiments, winding grooves 520 may not be provided in the second region 512. As shown in FIG18 , a fourth winding groove 524 is provided on the outer wall of the shell 510. The coil provided in the fourth winding groove 524 can heat the object in the heating chamber 300 from the side of the heating chamber 300. Furthermore, the coil provided in the fourth winding groove 524 can also heat the object in the heating chamber 300 from the bend 517 and the top surface. In this embodiment, there is no restriction on the variation pattern of the slot spacing of the fourth winding grooves 524 in the fourth region 514. For example, the slot spacing of the fourth winding grooves 524 can gradually increase or decrease in a direction perpendicular to the first direction, or first increase and then decrease, or remain unchanged. There is no restriction on the size of the slot pitch of the fourth winding slots 524 in the fourth area 514 . For example, the minimum slot pitch of the fourth winding slots 524 may be greater than the slot pitch of the first winding slots 521 , or may be less than or equal to the slot pitch of the first winding slots 521 .

[0142] In an embodiment where the second region 512 is not provided with a winding groove 520, as shown in Figures 18 and 19, a through hole 5121 can be provided in the second region 512 to dissipate heat or reduce weight. Furthermore, in this embodiment, the area surrounded by the second region 512 is all through holes 5121 that penetrate the shell 510. Furthermore, in order to better improve the problem of objects in the heating chamber 330 being burned by heat near the corner 340, the ratio of the size of the area of ​​the bent portion 517 covered by the second region 512 in the first direction to the size of the shell 510 in the first direction is in the range of [0.5, 1]. For an embodiment where the second region 512 is all through holes 5121, the ratio of the size of the area of ​​the bent portion 517 covered by the second region 512 in the first direction to the size of the shell 510 in the first direction is in the range of [0.5, 1).

[0143] Furthermore, in the embodiment where the second region 512 is not provided with the winding groove 520 , the second region 512 may be adjacent to the first region 511 , or may be surrounded by the fourth region 514 and thus not adjacent to the first region 511 .

[0144] In some embodiments, the second region 512 covers the bend 517 to reduce the magnetic field strength at the corresponding corner 340 within the heating chamber 330, thereby improving the problem of the heated object being burned near the corner 340. The second region 512 may cover only the bend 517 or also the area near the bend 517. Furthermore, the second region 512 may cover a portion of the bend 517 facing the first region 511 or a portion of the bend 517 facing away from the first region 511.

[0145] Taking the case where the housing 510 has two bent portions 517 as an example, in some embodiments, as shown in Figures 13, 14, and 20, the housing 510 is U-shaped, and the second region 512 completely covers the bent portion 517. Thus, the outer wall of the housing 510 is divided into a second region 512, a first region 511, and a second region 512, which are sequentially arranged. That is, in a direction perpendicular to the first direction, the first region 511 is located between the two second regions 512. In other embodiments, as shown in Figure 19, the second region 512 only partially covers the bent portion 517. Thus, the outer wall of the housing 510 is divided into a first region 511 and two second regions 512 separated by the first region 511. Furthermore, the second region 512 is surrounded by the inner side of the first region 511, that is, the first region 511 is distributed around the second region 512.

[0146] In some embodiments, the structure of the wire winding reel 500 is shown in Figures 8 to 15 . The housing 510 includes a first plate 515 corresponding to the top or bottom surface of the heating chamber 300 and a second plate 516 corresponding to the side surface of the heating chamber 300. Furthermore, in the electromagnetic chamber assembly 200 provided in this embodiment, a wire winding reel 500 is mounted on each of the first chamber 310 and the second chamber 320. Each of the first chamber 310 and the second chamber 320 includes two side surfaces. Accordingly, a second plate 516 is disposed on each side of the first plate 515 of the housing 510. The intersection of the first plate 515 and the second plate 516 forms a bend 517 of the housing 510. The first plate 515 and the second plate 516 are generally plate-shaped structures. Specifically, the first plate 515 and the second plate 516 are smaller in one direction and larger in the other two directions, resulting in the first plate 515 and the second plate 516 having a generally plate-shaped structure. The first plate 515, the second plate 516, and the surface of the bent portion 517 facing away from the heating chamber 300 form the outer wall of the shell 510. A groove wall 530 is provided on the surface of the first plate 515 and the second plate 516 facing away from the heating chamber 300 to form a winding groove 520. The connection between the first plate 515 and the second plate 516 is not limited to a circular arc transition, i.e., the cross-sectional profile of the bent portion 517 perpendicular to the first direction is not limited to an arc. The first plate 515 and the second plate 516 can also be directly connected using a plate-like structure, i.e., the cross-sectional profile of the bent portion 517 perpendicular to the first direction can also be a broken line segment, wherein the broken line segment can include two or more line segments. A groove wall 530 can also be provided on the surface of the bent portion 517 facing away from the heating chamber 300 to form the winding groove 520.

[0147] The winding groove 520 provided on the first plate 515 can be used to heat the object from the top or bottom surface of the heating chamber 300 after the coil is installed, and the winding groove 520 provided on the second plate 516 can be used to heat the object from the side surface of the heating chamber 300 after the coil is installed.

[0148] In some embodiments, the first plate 515 and the second plate 516 are both flat plate structures to simplify the structure of the housing 510, and the second plate 516 is obliquely connected to the side of the first plate 515. Furthermore, the first plate 515 and the second plate 516 are both rectangular plates.

[0149] Taking the winding reel 500 structure of Figures 13 to 15 as an example, in some embodiments, the first region 511 can be distributed only in a portion of the first plate 515, and the second region 512 can be distributed in the second plate 516 and the bend 517. The first region 511 and the second region 512 can be arranged adjacent to each other as shown in Figure 20, or they can be separated by a third region 513 as shown in Figure 16. In some embodiments, the first region 511 can also be as shown in Figure 18, covering the first plate 515, the bend 517, and the second plate 516, with the second region 512 surrounded by the first region 511. In some embodiments, the first region 511, the third region 513, the second region 512, and the fourth region 514 can also be distributed in sequence as shown in Figure 21.

[0150] In the above embodiments, the winding density of the coils is reduced to thereby reduce the magnetic field strength after the coils are superimposed near the corner 340 of the heating chamber 300. In other embodiments, the distance between the corner 340 of the heating chamber 300 and the coils is increased to reduce the magnetic field strength after the coils are superimposed near the corner 340 of the heating chamber 300, thereby improving the problem of the heated object being burnt at the corner 340 of the heating chamber 300.

[0151] On the one hand, in some embodiments, the coils within some of the first winding slots 521 in the first plate 515 are positioned further away from the corner 340 of the heating chamber 300, thereby increasing the distance between the coils at the corner 340 and the heated object. As shown in Figures 7 to 9, 14, and 18, a portion of the outer wall of the housing 510 included in the first region 511 has a raised portion 518, and the raised portion 518 is located near the bend 517. The raised portion 518 is a structure in the housing 510 that rises toward the side away from the heating chamber 300. The coils within the first winding slots 521 located above the raised portion 518 are further away from the corner 340 of the heating chamber 300 and from the heating chamber 300. Therefore, the magnetic field strength generated by the coil arranged in the first winding groove 521 on the raised portion 518 near the corner 340 of the heating chamber 300 is relatively weak, which can effectively improve the problem of excessive energy concentration at the corner 340 of the heating chamber 300 causing the object to be burnt by heat.

[0152] Accordingly, to reduce the weight of the housing 510, a gap is provided between the inner wall of the housing 510 corresponding to the raised portion 518 and the heating chamber 300. Specifically, as shown in Figures 14 and 15, the side of the first plate 515 facing the heating chamber 300 includes a first inner wall 5151 and a second inner wall 5152. The projection of the raised portion 518 along the thickness direction of the first plate 515 is located on the second inner wall 5152. The first inner wall 5151 is configured to contact the heating chamber 300, while a gap exists between the second inner wall 5152 and the heating chamber 300. Of course, in other embodiments, the second inner wall 5152 may also be flush with the first inner wall 5151.

[0153] Furthermore, a plurality of first winding grooves 521 are provided in parallel in the first region 511 corresponding to the second inner wall 5152 in a direction approaching the bend 517. Furthermore, the bottoms of the plurality of first winding grooves 521 gradually move away from the first inner wall 5151 in a direction approaching the bend 517, so that the distance between the bottoms of the winding grooves 520 on the raised portion 518 and the corner 340 of the heating chamber 300 and the heating chamber 300 gradually increases in the direction of the raised portion 518 approaching the bend 517, thereby preventing the coil from generating an excessively strong magnetic field at the corner 340 of the heating chamber 300. Of course, in other embodiments, a portion of the outer wall of the housing 510 included in the second region 512 may also include the raised portion 518.

[0154] On the other hand, in some embodiments, by positioning the winding groove 520 on the second plate 516 further from the corner 340 of the heating chamber 300, the distance between the coil at the corner 340 and the heated object is increased. This reduces the intensity of the superimposed magnetic fields generated by the coil near the corner 340 of the heating chamber 300, thereby improving the problem of the heated object being burnt at the corner 340 of the heating chamber 300. For example, after the winding reel 500 is installed in the heating chamber 300, a certain gap can be left between the second plate 516 and the corner 340 of the heating chamber 300.

[0155] In one embodiment, the angle α of the inner wall of the shell 510 at the bending portion 517 is smaller than the angle β of the heating chamber 300 at the corner 340; as shown in Figure 11, the connection method of the winding reel 500 and the heating chamber 300 is that the first plate 515 is in contact with the surface of the heating chamber 300, or there may be a gap between the first plate 515 and the surface of the heating chamber 300, and the second plate 516 is in contact with the heating chamber 300 away from the edge of the first plate 515, so that after the shell 510 is installed in the heating chamber 300, there is a gap between the second plate 516 and the corner 340 of the heating chamber 300, so that the winding groove 520 in the second area 512 is farther away from the object in the heating chamber 330, which can effectively improve the problem of excessive energy concentration at the corner 340 of the heating chamber 300.

[0156] The above embodiment can improve the problem of excessive magnetic field strength at the corner 340 of the heating chamber 300 due to the superposition of the magnetic fields of the coils. In some embodiments of the winding reel assembly 400, a magnet 410 is further provided on the winding reel 500, which plays a role in magnetic concentration to avoid insufficient magnetic field strength at local positions in the heating chamber 330 inside the heating chamber 300. For example, in some embodiments, magnets 410 are provided on both the first plate 515 and the second plate 516 to improve the negative impact caused by the low coil density near the bend 517. Furthermore, in some embodiments, the shell 510 is also connected to a magnetic core bracket for mounting the magnet 410; a temperature probe can also be provided on the shell 510 to detect the temperature of the heating chamber 300; in order to avoid excessive current, a fuse is also provided in the control board for controlling the coil. In some embodiments, the fuse is a temperature fuse, and the surface of the fuse is in contact with the coil, so that when the temperature of the coil rises to a certain value, the fuse is disconnected, so that the control board used to control the coil is powered off, and no current flows through the coil, and the heating process of the heating chamber 300 is stopped.

[0157] This application also provides an electromagnetic heating module 100 for heating an object using the electromagnetic chamber assembly 200 provided by the above-described technical solution. In some embodiments, the electromagnetic heating module 100 includes a mounting frame 110, to which the electromagnetic chamber assembly 200 is rotatably connected. The mounting frame 110 is also provided with a drive device 120 for driving the electromagnetic chamber assembly 200 to rotate. It is readily understood that during the heating process of the electromagnetic chamber assembly 200, the electromagnetic chamber is driven to rotate by the drive device 120, so that the object within the electromagnetic chamber assembly 200 is heated more evenly.

[0158] In one embodiment, a belt drive is used to drive the electromagnetic chamber assembly 200 to rotate. Specifically, as shown in Figures 1 to 3, a transmission belt 130 is used between the driving device 120 and the electromagnetic chamber assembly 200 for belt transmission; the driving device 120 can be a motor.

[0159] Furthermore, since the electromagnetic chamber assembly 200 includes a coil, the coil needs to be connected to an external power supply. In order to prevent the electromagnetic chamber assembly 200 from rotating too much in the same direction and causing the wires connecting the coils to be entangled on the electromagnetic chamber assembly 200, in an optional solution of the present application, the electromagnetic chamber assembly 200 is continuously rotated forward and reversed to prevent the electromagnetic chamber assembly 200 from rotating too much in the same direction. Specifically, in one embodiment, the output shaft of the driving device 120 is connected to a driving wheel, and one end of the heating chamber 300 is connected to a driven wheel 140, and the driving wheel and the driven wheel 140 are connected by a transmission belt 130. The heating chamber 300 is relatively fixedly connected to an induction plate 141; a first induction device 151 that can be triggered by the induction plate 141 is provided on the mounting frame 110. Further, the induction plate 141 is connected to the driven wheel 140. It is easy to understand that each time the heating chamber 300 rotates one revolution along with the driven wheel 140, the sensor plate 141 triggers the first sensing device 151. This allows the number of revolutions of the heating chamber 300 to be calculated, thereby controlling the number of revolutions of the heating chamber 300. For example, when the rotation angle of the heating chamber 300, measured by the sensor plate 141 and the first sensing device 151, reaches a predetermined angle, the heating chamber 300 is reversed. In some embodiments, the sensor plate 141 is provided on the driven wheel 140. In some embodiments, the heating chamber 300 may reverse after every 180° to 500° of rotation.

[0160] In other embodiments, only the program-controlled driving device 120 may be used for rotation. For example, the program-controlled driving device 120 may be used to rotate forward for a certain angle and then reverse. In some embodiments, the sensing plate 141 may be a sheet-like structure connected to the driven wheel 140, and the first sensing device 151 may be an existing sensor. The sensing position of the first sensing device 151 is a position at which the sensing plate 141 triggers the first sensing device 151.

[0161] Furthermore, when the device suddenly loses power, it may be impossible to determine the rotation direction and the angle of rotation of the electromagnetic chamber assembly 200 before the power outage. In order to avoid this situation causing equipment failure, in an optional embodiment, a second sensing device 152 is further provided on the mounting frame 110 or other position, and an accessory 131 is provided on the transmission belt 130 of the belt transmission mechanism. The position of the second sensing device 152 is used as the origin. After each power outage, the accessory 131 is returned to the origin in a preset direction. It is not difficult to understand that each time the accessory 131 returns to the origin in a preset direction, the rotation angle of the heating chamber 300 and the winding condition of the wire on the heating chamber 300 are the same and known. After the accessory 131 triggers the second sensing device 152, the heating chamber 300 is driven to rotate according to the preset rotation direction and rotation angle.

[0162] In some optional embodiments, the electromagnetic heating module 100 also has a control board, which is provided with a single-chip microcomputer or a chip as a processing unit, and related control circuits. The processing unit is connected to the driving device 120, the first sensing device 151 and the second sensing device 152 through the control circuit to realize signal connection between the first sensing device 151, the second sensing device 152 and the driving device 120.

[0163] Taking the state shown in FIG2 as an example, the processing method for restarting the above-mentioned device after a sudden power outage is explained. The specific method includes: first restoring the power supply to the electromagnetic heating module 100, and after the power is restored, the processing unit sends a signal to the driving device 120 to make the transmission belt 130 move in a preset direction (taking FIG2 as an example, the preset direction is clockwise, and in other embodiments, it can also be counterclockwise), that is, the attachment 131 moves to the upper left, and when the attachment 131 moves to the sensing position of the second sensing device 152, the second sensing device 152 sends a signal to the processing unit. At this time, the processing unit sends a signal to the driving device 120 again to reverse the driving device 120, and then the driving device 120 drives the heating chamber 300 to reverse (that is, rotate counterclockwise) through the transmission belt 130 and work according to the preset program. The preset program here refers to the program for controlling the rotation of the heating chamber 300 to complete the heating of the object in the heating chamber 300. The preset program can be a program that causes the heating chamber 300 to rotate forward a certain angle and then reverse a certain angle, and repeat this cycle until the preset heating time is reached. The preset program can also be a program that causes the heating chamber 300 to rotate with the driven wheel 140, and each time the sensor plate 141 on the driven wheel 140 triggers the first sensing device 151, the driving device 120 drives the heating chamber 300 to reverse. Of course, the preset program can also use other methods to control the periodic reversal of the heating chamber 300. In some embodiments, the driving device 120 can be a servo motor, a stepper motor, etc. Furthermore, the second sensing device 152 can be a limit switch, and the accessory 131 can be a block-shaped structural member that can trigger the second sensing device 152.

[0164] The electromagnetic heating module 100 provided in an embodiment of the present application requires continuous power supply while rotating. This can be achieved by powering the coils via brushes and conductive slip rings. However, the inventors discovered in experiments that using brushes and conductive slip rings to power the coils results in unstable current in the coils, resulting in poor heating performance. Therefore, in one embodiment of the present application, a wire is used to connect the coils to a power source, and the heating chamber 300 rotates in a regular, periodic forward and reverse direction. This ensures that the heating chamber 300 rotates while heating food, while also ensuring a stable current is supplied to the coils during rotation.

[0165] In some embodiments of the present application, a door 160 is further provided on the mounting frame 110 to cover the opening of the heating chamber 330, so that the object in the heating chamber 330 is enclosed inside the heating bin 300. Further, the door 160 can be a flip - type structure, and the door 160 covers the opening of the heating chamber 330 by rotating around an axis; it can also be a lifting - type structure, and the door 160 covers the opening of the heating chamber 330 by moving in the vertical and horizontal directions. Further, a limiting structure is provided inside the heating bin 300, and a protrusion 161 is provided on the door 160. The object is limited from both sides of the object in the heating bin 300 by the limiting structure and the protrusion 161 on the door 160, so as to prevent the object from detaching from the heating bin 300 during the rotation of the heating bin 300. Among them, the limiting structure can be a plane for limiting provided inside the heating chamber 330, or the wall body at one end of the heating bin 300 opposite to the door 160. It is easy to understand that when the door 160 covers the opening of the heating chamber 330, the protrusion 161 is located inside the contour line of the opening of the heating chamber 330, and the size of the protrusion 161 should be such that it can limit the meal box 600 while not having too much impact on the discharge of oil fume inside the heating bin 300. Calculated by the orthographic projection area along the rotation axis line of the heating bin 300, the projection area of the protrusion 161 can be 1 / 10 - 2 / 3 of the opening area of the heating chamber 330. Further, the projection area of the protrusion 161 can be 1 / 5 - 2 / 3 or 1 / 4 - 1 / 2 of the opening area of the heating chamber 330. The protrusion 161 can be an independent structure or a combination of multiple structures. When the protrusion 161 is a combination of multiple structures, it can be multiple columnar structures, which are basically the same as the multiple columnar structures. When the door 160 covers the opening of the heating chamber 330, the protrusion 161 is basically located near the rotation axis line of the heating bin 300. Optionally, the protrusion 161 is a cylindrical structure rotatably provided on the door 160, and the rotation axis is coincident with the rotation axis of the heating bin 300. In some embodiments, the protrusion 161 can be a block - shaped structural member, or a sheet metal part bent into a "U" - shape, and the opening of the sheet metal part faces the door 160 so that the surface facing the heating bin 300 of the protrusion 161 is a flat surface. In order to reduce the impact of the protrusion 161 on the rotation process of the meal box 600, the protrusion 161 can be configured to be rotatably connected to the door 160. For example, a rotating shaft can be used to connect the protrusion 161 and the door 160.

[0166] The present application also provides an automatic vending device, including the wire reel 500 or the wire reel assembly 400 or the electromagnetic bin assembly 200 or the electromagnetic heating module 100 provided in the above - mentioned embodiments. The electromagnetic heating module 100 provided in the embodiments of the present application can be applied not only to the unattended automatic vending device, but also to the frying equipment in the central kitchen.

[0167] At present, in the relevant technology, when electromagnetic heating is adopted, especially for the heating body with a rectangular surface, if the coil adopts a rectangular wire slot arrangement, the diagonal line of the rectangular heating surface is usually a low temperature area, and obvious high temperature points are easily generated in other areas; if the coil adopts a circular wire slot arrangement, the heating area is mainly concentrated on the projected area of ​​the circular coil, and the areas on both sides of the long side of the rectangular surface heating body are usually low temperature areas.

[0168] Based on this, the embodiment of the present invention provides an electromagnetic heating chamber assembly 100, as shown in Figures 22 to 24, comprising a wire reel 11 and a chamber body 12. The chamber body 12 has a heating chamber 31 for placing a lunch box 30. One end of the chamber body 12 is provided with an opening communicating with the heating chamber 31 for taking and placing the lunch box 30. The other end of the chamber body 12 is provided as a power input end. The wire reel 11 is mounted on the side of the chamber body 12. The inner wall of the wire reel 11 covers the side of the chamber body 12. The outer wall of the wire reel 11 is provided with a wire groove for setting the wire to achieve heating of the lunch box 30 placed in the chamber body 12. The wire reel 11 has a first area. A plurality of first-type wire grooves 13 are provided in the first area, and the first-type wire grooves 13 include straight wire grooves and arc-shaped wire grooves connected to the straight wire grooves. The straight wire grooves are arranged to extend in a straight line along the first direction, and the straight wire grooves are spaced apart along the second direction. The arc-shaped wire grooves are arranged to extend in an arc shape along the second direction, and the arc-shaped wire grooves are spaced apart along the first direction, so that the wires arranged in the first-type wire grooves 13 are arranged in a plurality of runway shapes spaced apart from the inside to the outside; the first direction is approximately perpendicular to the second direction.

[0169] In an embodiment of the present application, the first direction is set to the Y direction, for example, and the second direction is set to the X direction, for example. The lunch box 30 to be cooked can be set to a metal lunch box, such as an aluminum foil box; the aluminum foil box can be made of food-grade aluminum alloy with aluminum as the base material. The lunch box 30 may include a lid and a bottom box, the lid is provided with a protruding first edge, and the bottom box is provided with a protruding second edge, the first edge is buckled on the second edge to seal the lid and the bottom box; when cutting along the first direction or the second direction, the cross-sections of the lid and the bottom box are both set to be trapezoidal. The length of the maximum side of the lunch box 30 to be cooked along the X direction (which can be defined as the narrow side) is smaller than the length of the maximum side along the Y direction (which can be defined as the long side). The narrow side of the lunch box 30 placed in the heating chamber faces the opening, and the long side of the lunch box 30 extends along the Y direction. The top and bottom surfaces of the lunch box 30 are rectangular surfaces. The inner wall of the winding drum 11 covers the side of the bin body 12. The first area can be set to correspond to the top and bottom surfaces of the lunch box 30. The narrow side of the lunch box 30 can be corresponded to the arc-shaped wire groove area, and the long side of the lunch box 30 can be corresponded to the straight wire groove area. The wire is wound in the first wire groove 13 along the straight wire groove and the arc-shaped wire groove in sequence for multiple turns to form a coil, thereby presenting a runway-shaped coil. In this way, the runway-shaped coil can not only cover a larger heating area of ​​the top or bottom surface of the lunch box 30, but also avoid the generation of low-temperature areas on the diagonal line of the rectangular heating surface, and avoid the generation of obvious high-temperature points, thereby effectively improving the uniformity of the electromagnetic coil heating the rectangular surface, and preventing uneven heating from causing local sticking of the pot.

[0170] In the embodiment of the present application, Figure 25 shows the winding shape of the electromagnetic heating coil. Through finite element simulation, magnetic field simulation is performed on the rectangular coil shown in Figure 25a, the circular coil shown in Figure 25b, and the runway-shaped coil wound in a transitional slot arrangement from circular to rectangular as proposed in the embodiment of the present application as shown in Figure 25c. The results are shown in Figure 26. Correspondingly, Figure 26d is a schematic diagram of the magnetic field simulation of the rectangular coil, Figure 26e is a schematic diagram of the magnetic field simulation of the circular coil, and Figure 26f is a schematic diagram of the magnetic field simulation of the runway-shaped coil; the color in Figure 26 changes from level 1 to 7, which means that the temperature gradually changes from low to high. Figure 26d shows that when a rectangular coil is used for electromagnetic heating, it is easy to produce local excessive temperature, and the four high-temperature points are very Obviously, the temperature in the diagonal area is too low, resulting in unsatisfactory heating uniformity. FIG26e shows that the heating temperature on the projected area of ​​the circular coil is relatively uniform, but the temperature on the uncovered outer right-angled area is lower. FIG26f shows that the heating area of ​​the runway-shaped coil is larger and the heating temperature is relatively uniform. The simulation results show that the magnetic field uniformity of the runway-shaped coil wound by the circular to rectangular transition slot arrangement has been greatly optimized. The magnetic field variances of the rectangular, circular and runway-shaped coil schemes are 0.297, 0.139 and 0.078 respectively. In the magnetic field simulation of the runway-shaped coil wound by the circular to rectangular transition slot arrangement proposed in the embodiment of the present application, the magnetic field variance is reduced by 74% compared with the magnetic field variance of the rectangular coil scheme.

[0171] In some embodiments, the winding reel 11 further has a second area, which is located in the first area; a plurality of second-type wire grooves 14 are provided in the second area, and the second-type wire grooves 14 are arranged as circular rings spaced and coaxially distributed from the inside to the outside, so that the wires arranged in the second-type wire grooves 14 are arranged in a plurality of circular rings; wherein the second-type wire grooves 14 are connected to the first-type wire grooves 13, so that the wires are wound through the second-type wire grooves 14 in sequence and then enter the first-type wire grooves 13 for winding.

[0172] Specifically, the second area is located at the center of the winding drum 11. The second type of wire groove 14 in the second area is set to be circular, which is more conducive to winding the coil; the center position can be set as the winding starting point of the wire.

[0173] In some embodiments, the winding reel 11 includes a first side panel and two second side panels respectively connected to the two sides of the first side panel, and the angle between the second side panel and the first side panel is set to an obtuse angle; wherein the first area and the second area are located on the first side panel; a hollow is provided at the connection between the first side panel and the second side panel, and the hollow is used for heat dissipation.

[0174] Specifically, in order to facilitate installation and disassembly, two winding drums 11 can be provided, and they can be symmetrically arranged, and can be installed on the side of the warehouse body 12 by threaded fasteners; the wire grooves in the first area and the second area can be provided on the first side panel, and a third area can be provided on the winding drum 11, and the third area can surround the outer periphery of the first area, and a third type of annular wire groove 15 is provided in the third area, and the third type of wire groove 15 can surround the first side panel and the two second side panels, so that the side walls of the lunch box 30 can also be heated evenly; in order to avoid excessive concentration of energy at the connection between the first side panel and the second side panel, no wires may be arranged at this connection, and a hollowing may be provided for heat dissipation.

[0175] In some embodiments, the depth of the second wire groove 14 is greater than the depth of the first wire groove 13, so that the number of wire layers arranged in the second wire groove 14 is greater than the number of wire layers arranged in the first wire groove 13. Specifically, the widths of the first wire groove 13 and the second wire groove 14 can be set to be the same, and can be set slightly larger than the outer diameter of the wire to fix the wire. The center position of the winding drum 11 is the starting point of the winding. At this position, the extension direction of the coil changes rapidly, and the generated magnetic fields partially cancel each other out. The groove depth of the second wire groove 14 in the second area is greater than the groove depth of the first wire groove 13. This can accommodate more wire layers. For example, three layers of wire can be arranged in the second wire groove 14, and two or one layers of wire can be arranged in the first wire groove 13. Therefore, more layers of wire are arranged in the second wire groove 14 in the second area. In the vertical direction, the more coil turns increase the current, which can increase the magnetic field strength to compensate for the offset magnetic field, thereby making the lunch box 30 more evenly heated.

[0176] In some embodiments, the depth of the straight wire groove gradually decreases from the inside to the outside along the second direction, so that the number of layers of wires arranged in the straight wire groove is correspondingly reduced. Specifically, the depth of the straight wire groove gradually decreases from the inside to the outside along the X direction, that is, from the middle of the first side panel to the sides close to the second side panel, the depth of the straight wire groove gradually decreases, and accordingly, the number of layers of wires in the straight wire groove gradually decreases, thereby avoiding excessive concentration of energy at the connection between the first side panel and the second side panel, resulting in uneven heating of the heated lunch box. In addition, from the middle of the first side panel to the sides close to the second side panel, the first side panel gradually arches, which can correspondingly increase the distance between the coil and the chamber body 12, thereby avoiding excessive concentration of energy at the connection between the first side panel and the second side panel, resulting in uneven heating of the heated lunch box. The specific form of the arch is not limited, and the cross-section of the arch position (perpendicular to the long side direction of the lunch box) can be a step-shaped or a smooth curve.

[0177] In some embodiments, the connection between the arc-shaped wire groove and the straight wire groove is set to be an arc transition, and the radius of the arc is set to 8-24% of the straight wire groove of the same ring.

[0178] In some embodiments, the arc-shaped wire groove and the second wire groove 14 are coaxially arranged.

[0179] In some embodiments, the electromagnetic heating chamber assembly 100 further includes: a magnetic isolation layer, which is located between the winding drum 11 and the chamber body 12; the magnetic isolation layer includes a magnetic core or a magnetic isolation member, the material of the magnetic isolation layer is set to ferrite or nanocrystal, and the length of the magnetic isolation layer is set to 5-35% of the length of the winding drum.

[0180] Specifically, between the winding reel 11 and the warehouse body 12, the magnetic field at a specific position can be reduced by adding a magnetic core or a magnetic isolation sheet, thereby reducing the temperature; for example, the magnetic core material is ferrite or nanocrystal, with a thickness of 2-6mm, and the core length accounts for 5-35% of the winding reel length. If the core length is too short, the magnetic isolation capacity is limited; if the core length is too long, the coil energy conversion efficiency is reduced, the winding reel 11 temperature is too high, and the energy consumption is large.

[0181] In some embodiments, the electromagnetic heating chamber assembly 100 further includes: a temperature equalizing member 16, which is connected to the inner wall of the chamber body 12, and the other side of the temperature equalizing member 16 away from the chamber body 12 is in contact with the lunch box 30; the thermal conductivity coefficient of the temperature equalizing member 16 is set to above 5W / (K*m); in an exemplary embodiment, the thermal conductivity coefficient of the temperature equalizing member 16 is set to 20-30W / (K*m); the temperature equalizing member 16 includes a first temperature equalizing plate, which is connected to the first side plate, and the thickness of the first temperature equalizing plate is adjusted according to the size of the lunch box 30.

[0182] Specifically, when the heating method is electromagnetic heating, the chamber 12 can be made of non-metallic materials (such as high-temperature resistant plastics or ceramics), and the lunch box is an aluminum foil box. In order to make the lunch box heated more evenly, a temperature equalizing plate can be set at the bottom of the lunch box to contact the lunch box and play a role in structural support. The temperature equalizing plate has a large thermal conductivity coefficient and is not conductive or magnetic, so as to avoid the occurrence of electromagnetic shielding. The temperature equalizing plate material can be set as a ceramic material, such as a microcrystalline glass plate with a thermal conductivity coefficient of 1.7W / (K*m). Furthermore, a material with a higher thermal conductivity coefficient can be selected to replace the microcrystalline panel, such as alumina (thermal conductivity coefficient is 20-30W / (K*m)), silicon carbide (thermal conductivity coefficient is about 83.6W / (K*m)) and other high thermal conductivity ceramics. If the temperature equalizing plate is made of alumina material to heat the food, the high thermal conductivity of the alumina plate greatly improves the temperature uniformity of electromagnetic heating. The heat absorbing plate and the chamber body 12 can be bonded together using a high-temperature resistant colloid. By selecting heat absorbing plates of varying thickness, the size of the lunch boxes that the electromagnetic chamber can accommodate can be fine-tuned. For example, the thicker the heat absorbing plate, the smaller the spacing between the upper and lower heat absorbing plates, allowing for smaller lunch boxes to be accommodated. A smaller spacing between the upper and lower heat absorbing plates can also reduce the shaking of the lunch box during rotation. The chamber body 12 can also be provided with through-holes in the area covered by the heat absorbing plates to reduce its weight.

[0183] In some embodiments, the housing 12 may include a first housing 121 and a second housing 122 symmetrically disposed with respect to the first housing 121. The first and second housings 121, 122 are connected as a single unit via threaded fasteners. The cross-section of the housing 12 is generally hexagonal, i.e., the housing 12 includes a top surface, a bottom surface, and four side surfaces. Correspondingly, the two winding drums 11 cover the side surfaces of the first and second housings 121, 122, respectively. A magnet 17 may be disposed on the outside of the winding drums 11 to serve as a magnetic field concentration mechanism, thereby preventing insufficient magnetic field strength at local locations within the heating chamber.

[0184] The present invention also provides an electromagnetic heating device, as shown in Figures 27-29, comprising a frame 21, an electromagnetic heating chamber assembly 100, and a drive assembly. Both the electromagnetic heating chamber assembly 100 and the drive assembly are mounted on the frame 21. The drive assembly is connected to the power input terminal of the chamber body 12 to drive the electromagnetic heating chamber assembly 100 to rotate.

[0185] In some embodiments, the drive assembly includes: a motor 22, a driving wheel 23 connected to the motor 22, a driven wheel 24, and a transmission member 29, the transmission member 29 is sleeved on the driving wheel 23 and the driven wheel 24, and the driven wheel 24 is connected to the power input end of the warehouse body 12; the electromagnetic heating device also includes:

[0186] The first detection assembly includes a first sensor 25 and a first sensing member 26. The first sensor 25 is mounted on the frame 21, and the first sensing member 26 is mounted on the driven wheel 24. When the first sensing member 26 approaches the first sensor 25 and the first sensor 25 detects a signal, it is used to detect whether the lunch box 30 placed in the bin 12 is in a horizontal position and to detect the number of rotations of the bin 12.

[0187] The second detection component, its second sensor 27 and second sensing member 28, the second sensor 27 is installed on the frame 21, and the second sensing member 28 is installed on the transmission member 29; when the second sensing member 28 approaches the second sensor 27 and the second sensor 27 detects a signal, the motor 22 stops rotating to prevent the number of rotations of the warehouse body 12 from exceeding a preset range, thereby preventing the cables connecting the wires in the wire trough from being excessively entangled.

[0188] Specifically, the transmission member 29 can be set as a synchronous belt or a belt to achieve meshing transmission with the driving wheel 23 and the driven wheel 24; the first sensor 25 is set as a proximity photoelectric sensor, for example, and the first sensor 25 can be set at the bottom of the frame 21, and the second sensor 27 is set as a limit switch. Each time the device is restarted, for example, the motor 22 rotates forward, driving the first sensing member 26 on the belt to rotate and triggering the first sensor 25. At this time, it can be determined that the lunch box 30 placed in the warehouse body 12 is in a horizontal position; the motor 22 then performs a first direction change, that is, the motor 22 reverses, thereby driving the electromagnetic warehouse to rotate a preset angle. When the second sensing member 28 on the belt is driven to rotate and trigger the limit switch, the motor 22 stops, and then the motor 22 performs a second direction change, that is, the motor 22 rotates forward, so that the belt drives the electromagnetic warehouse to rotate a preset angle. When the limit switch is triggered again, the motor 22 stops, and then the motor 22 performs a third direction change, and rotates reciprocatingly in this cycle; wherein, the number of times the first sensing member 26 triggers the first sensor 25 can be counted as the number of rotations of the warehouse body 12.

[0189] In some embodiments, the electromagnetic heating device further includes a limiting assembly comprising a baffle and a limiting block. The baffle is mounted on the frame 21 and has a notch formed therein that mates with the transmission member 29 to allow the transmission member 29 to pass through the notch. The limiting block is mounted on the transmission member 29; when the limiting block contacts the baffle, the transmission member 29 is prevented from passing through the notch. By providing the baffle and the limiting block, when the limiting block contacts the baffle, the transmission member 29 is prevented from passing through the notch. This prevents damage to the device caused by excessive rotation of the motor 22 when the travel switch is triggered without stopping the motor 22.

[0190] The present application also provides a vending machine including the aforementioned electromagnetic heating device. The vending machine may further include a refrigerator and a cooking cabinet. The refrigerator may store food containers to be cooked, which may contain fresh pre-processed ingredients. The cooking cabinet may be equipped with multiple electromagnetic heating devices, which may be used to stir-fry the pre-processed ingredients on-site or use other cooking methods to enhance the taste and freshness of the food.

[0191] The corresponding electromagnetic heating device is selected based on the cooking process to cook the ingredients, and the food boxes to be cooked are then transferred to the corresponding electromagnetic heating chamber assembly 100. The electromagnetic heating chamber assembly can utilize electromagnetic coil heating. As shown in Figure 8, the electromagnetic heating device may also include a chamber door 201. A heating chamber is disposed within the chamber body, which accommodates the food boxes 30 to be cooked. The chamber door 201 is configured to move up and down. When the chamber door 201 descends to a first position, it seals the heating chamber. When the chamber door 201 ascends to a second position, the food boxes to be cooked can enter the heating chamber for heating or the cooked food boxes can be removed. A motor drives the electromagnetic heating chamber assembly to rotate, causing the food boxes 30 to be cooked to rotate and stir the food inside. The vending machine can set different parameters such as heating time, temperature, power, and stir-frying speed based on the type of food to be cooked, ensuring uniform high-temperature stir-frying of the food, fully inducing the Maillard reaction, and enhancing the taste.

[0192] A control method for electromagnetic heating in an embodiment of the present application can be applied to a vending machine. The vending machine may include a refrigerator and a stir-fry cabinet. The refrigerator can store lunch boxes to be cooked, and the lunch boxes to be cooked can store fresh pre-processed ingredients. Multiple heating chambers can be set in the stir-fry cabinet, and the pre-processed ingredients can be stir-fried on-site using the heating chambers or other cooking methods to improve the taste and freshness of the food.

[0193] The corresponding heating chamber 20 is selected based on the cooking process, and the food boxes to be cooked are sent to the corresponding heating chamber 20. The heating method of the heating chamber can be electromagnetic coil heating. As shown in Figure 30, the heating chamber 20 includes a chamber door 201 and a chamber body 202. The heating chamber is located within the chamber body and is used to accommodate the food boxes 10 to be cooked. The chamber door 201 is configured to move up and down. When the chamber door 201 descends to a first position, the chamber door 201 seals the heating chamber. When the chamber door 201 rises to a second position, the food boxes to be cooked can enter the heating chamber for heating or the cooked food boxes can be removed. The heating chamber 20 can also be equipped with a drive mechanism, which may include a drive motor, for example, to enable the heating chamber to rotate, thereby driving the food boxes 10 to be cooked to flip and stir the ingredients inside.

[0194] The vending machine can set different parameters such as heating time, temperature, power, and stir-frying speed according to the type of ingredients to be cooked, so that the ingredients are stir-fried evenly at high temperature, fully undergoing the Maillard reaction and improving the taste. As shown in Figure 31, the vending machine may also include an industrial computer 11 and a main controller 12. The industrial computer 11 can be connected to the main controller 12 and configured to send instructions to the main controller to start the drive motor and / or start the electromagnetic coil heating, etc., which are not listed here one by one. The electromagnetic coil 13 and the drive motor 14 are all connected to the main controller so that the electromagnetic coil heating can be controlled to stop when the stir-frying is completed, and the heating chamber can be controlled to stop working. A temperature sensor 15 can be provided in the chamber body 202 for detecting the temperature inside the heating chamber; the temperature sensor 15 can be connected to the industrial computer 11, and the temperature sensor sends the detected temperature inside the chamber to the industrial computer 11 for processing.

[0195] Among them, the industrial computer 11 is, for example, a processor, which may include one or more central processing units (CPUs), graphics processing units (GPUs), application-specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or combinations thereof. The processor is capable of executing software or computer-readable instructions stored in a memory to perform the methods or operations described herein. The processor can be implemented in several different ways. For example, the processor can include one or more embedded processors, processor cores, microprocessors, logic circuits, hardware finite state machines (FSMs), digital signal processors (DSPs), or combinations thereof.

[0196] Currently, in the relevant technology, the stir-frying chamber of the vending machine can cook food on-site. If ingredients of the same temperature are placed in stir-frying chambers of different temperatures, although the energy converted from the induction heating of the electromagnetic coil is consistent, the total energy absorbed by the ingredients during the stir-frying process is different due to the different ambient temperatures in the chambers. Specifically, the temperature of the dishes after stir-frying is inconsistent, which affects the taste of the food and leads to a poor user experience.

[0197] Based on this, an embodiment of the present application proposes a control method for electromagnetic heating.

[0198] FIG32 shows a flow chart of a method for controlling electromagnetic heating according to an embodiment of the present application. The method includes the following specific steps:

[0199] S110: Get cooking process;

[0200] S120: Obtaining the category of ingredients to be cooked based on the acquired cooking process;

[0201] S130: Obtaining the initial temperature of the heating chamber;

[0202] S140: Compare the obtained initial temperature inside the chamber with the set reference temperature;

[0203] S150: Obtaining a temperature compensation strategy based on the comparison result between the initial temperature in the chamber and the set reference temperature and the type of the food to be cooked;

[0204] S160: Send the cooking process and temperature compensation strategy to the corresponding heating chamber so that the heating chamber executes the cooking process and temperature compensation strategy; wherein, the heating chamber uses an electromagnetic coil to heat the lunch box, and a lunch box is provided in the chamber body of the heating chamber, and the lunch box stores ingredients to be cooked.

[0205] In an embodiment of the present application, a user can open a client (app program) installed on a terminal device to order food, or order food on a vending machine. The industrial computer 11 receives the order and obtains the corresponding cooking process based on the menu selected by the user. The cooking process may include different parameters such as heating time, temperature, power, and stir-fry speed. The categories of ingredients to be cooked may include stir-fry ingredients and non-stir-fry ingredients. Stir-fry ingredients include, for example, various stir-fried dishes, and non-stir-fry ingredients include, for example, clay pot rice, steamed rice, and stewed soup. The cooking process for stir-fry ingredients may include parameters such as stir-fry speed, that is, the heating chamber rotates clockwise or counterclockwise at intervals to drive the lunch box to be cooked to flip over, so as to stir the ingredients in the lunch box to be cooked. When cooking non-stir-fry ingredients, the lunch box does not need to be flipped. The initial temperature inside the chamber can be obtained through the temperature sensor. When the lunch box containing the ingredients to be cooked is placed in the heating chamber, the heating chamber may have just started working, and the initial temperature inside the chamber is the ambient temperature, such as around 20°C; or the heating chamber has just cooked the last portion of ingredients, and the initial temperature inside the chamber may be higher, such as around 70°C; the set reference temperature can be determined according to the ingredients to be cooked. For example, if the temperature of the cooking ingredients needs to be within the range of 80-85°C, then the reference temperature inside the heating chamber can be set to 60°C. Therefore, the initial temperature inside the chamber is compared with the set reference temperature. If the initial temperature inside the chamber is consistent with the set reference temperature, the heating chamber does not need to be heated when cooking starts. Energy compensation; if the initial temperature inside the warehouse is lower than the set reference temperature, a certain power can be added to the electromagnetic coil when cooking begins, and as the temperature difference between the two increases, the power increase time increases; conversely, if the initial temperature inside the warehouse is higher than the set reference temperature, the power is reduced, and the higher the initial temperature inside the warehouse, the more power is reduced; by increasing or decreasing the power, the temperature compensation strategy is processed so that the initial temperature inside the warehouse reaches the set reference temperature, so that during the cooking process, there will be no difference in the total energy absorbed by the ingredients, and the temperature inconsistency of the ingredients after cooking can be avoided, thereby achieving consistent control of the heating of the ingredients, thereby improving the taste of the cooked food, and thus improving the user experience.

[0206] In some embodiments, step S150: obtaining a temperature compensation strategy based on the comparison result of the initial temperature in the chamber with the set reference temperature and the type of the food to be cooked, may include the following specific steps:

[0207] S151: Obtaining a temperature difference based on the initial temperature in the bin and the set reference temperature;

[0208] S152: Determining a duration for adjusting the input power of the heating chamber based on the temperature difference and a temperature compensation coefficient; wherein the temperature compensation coefficient is set based on the type of food to be cooked and adjusted based on the temperature of the food after cooking;

[0209] S153: Obtaining a first power difference according to the adjusted input power and the input power before adjustment;

[0210] S154: Determine the first energy for compensating the heating chamber according to the first power difference and the duration.

[0211] Specifically, in order to make the initial temperature in the chamber reach the set reference temperature through the temperature compensation strategy of increasing or decreasing power, the power increase or decrease can be set to 10%-20% of the input rated power of the heating chamber. The duration after adjusting the input power of the heating chamber can be calculated by the following formula: t = a × |T-T0|

[0212] Where a is the temperature compensation coefficient, expressed in S / °C; T is the initial temperature inside the chamber; and T0 is the set reference temperature. The temperature compensation coefficient is set based on the type of food being cooked and adjusted based on the temperature of the food after cooking. For example, when cooking clay pot rice, optimal results are considered when the temperature of the ingredients in the process heat chamber (e.g., a set reference temperature of 60°C) is between 80-85°C. If the chamber temperature is 20°C, the power is increased by 15% of the rated input power of the heating chamber. Calculation shows that the duration of this adjustment is 145 seconds. After heating for 145 seconds, heat the clay pot rice ingredients according to the cooking process. If the temperature of the cooked clay pot rice ingredients is detected to be 80-85°C, it is determined that the temperature compensation coefficient is better; if the temperature of the cooked clay pot rice ingredients is detected to be lower than 80°C, or higher than 85°C, then adjust the temperature compensation coefficient appropriately. This makes it easy to achieve consistent control of the heating of the ingredients, so as to improve the taste of the cooked food and thus improve the user experience. In other embodiments, the heating power can be automatically adjusted according to the difference between the actual temperature in the chamber detected by the temperature sensor and the set reference temperature. Therefore, the input power after adjustment and the input power before adjustment can be calculated to obtain a first power difference; the first energy for compensating the heating chamber can be calculated by the following formula: Q = (P2-P1) × t = (P2-P1) × a × |T-T0|

[0213] Where P2 is the input power after adjustment, and P1 is the input power before adjustment.

[0214] In an exemplary embodiment, obtaining a first power difference based on the adjusted input power and the input power before adjustment includes:

[0215] If the initial temperature inside the chamber is lower than the set reference temperature, the input power of the heating chamber is increased to compensate for the added energy of the heating chamber;

[0216] If the initial temperature inside the chamber is higher than the set reference temperature, the input power of the heating chamber is lowered to compensate for the reduced energy of the heating chamber.

[0217] In the embodiment of the present application, as shown in FIG33 , the control method of electromagnetic heating may further include the following specific steps:

[0218] S210: Obtaining the real-time average power of the electromagnetic coil heating in the first time period;

[0219] S220: Compare the real-time average power with the current input power;

[0220] S230: Obtaining a power correction strategy based on a comparison result between the real-time average power and the current input power;

[0221] S240: Dynamically adjust the current input power of the electromagnetic coil heating according to the power correction strategy.

[0222] Specifically, a current and voltage monitoring circuit board can be set in the vending machine to collect power data during the electromagnetic heating process of the heating chamber. The heating power of the electromagnetic coil can be monitored in real time, and the real-time average power can be calculated by moving weighted average or weighted average. The real-time average power is compared with the current input power, and the current input power is dynamically adjusted according to the comparison result to achieve power closed-loop control. In this way, within a certain power adjustment range, the voltage fluctuation of the power supply system can be avoided, which causes a large change in power, thereby improving the consistency of the cooked food; at the same time, it can compensate for the differences in power output modules and keep the heating power of the electromagnetic coil stable.

[0223] In some embodiments, step S210: obtaining the real-time average power of electromagnetic coil heating during the first time period includes the following specific steps:

[0224] S211: Acquire the current value and voltage value of the electromagnetic coil heating in the first time period, and calculate the current value and voltage value of the electromagnetic coil heating according to a preset interval frequency to obtain the real-time synthetic power of the electromagnetic coil heating;

[0225] S212: Calculate the real-time composite power by using a weighted average or a moving weighted average method to obtain a real-time average power.

[0226] Specifically, by acquiring the current and voltage values ​​of the electromagnetic coil heating, the heating power of the electromagnetic coil is monitored in real time. The current and voltage values ​​of the electromagnetic coil heating can be calculated once every 50-300ms. For example, the real-time combined power can be calculated once every 300ms. Within 3s, the real-time combined power can be obtained 10 times. The real-time average power can be calculated by taking a weighted average of these 10 real-time combined powers.

[0227] In some embodiments, step S230: obtaining a power correction strategy based on the comparison result of the real-time average power and the current input power, includes the following specific steps:

[0228] S231: Obtaining a second power difference between the current input power and the real-time average power;

[0229] S232: Obtaining a corrected power based on the difference between the current input power and the second power;

[0230] S233: Inputting a correction power so that the electromagnetic coil of the heating chamber is heated according to the correction power.

[0231] Specifically, the first time period is set to 3S, for example. If the current input power is higher than the real-time average power and the second power difference is positive, the second power difference is added to the current input power to obtain the corrected power. At this time, the corrected power is higher than the previous input power. If the current input power is lower than the real-time average power and the second power difference is negative, the second power difference is added to the current input power to obtain the corrected power. At this time, the corrected power is lower than the previous input power. In this way, the electromagnetic coil of the heating chamber is heated according to the corrected power to achieve dynamic power adjustment.

[0232] At present, in the related technology, thin aluminum foil lunch boxes are directly heated by electromagnetic heating. Due to the thin thickness of the aluminum foil lunch box, when the heating power is too large, especially when heating solid food and viscous food, there is a problem that the aluminum foil lunch box is easy to melt through, resulting in only liquid food being able to be heated.

[0233] In view of this, in the embodiment of the present application, as shown in FIG34 , the control method of electromagnetic heating may further include the following specific steps:

[0234] S310: Obtaining the real-time average power of electromagnetic coil heating in the first time period;

[0235] S320: Compare the real-time average power with a preset safety threshold, and determine whether there is a risk of the lunch box melting through based on the comparison strategy;

[0236] S330: When it is determined that there is a risk of the lunch box melting through, the electromagnetic coil is controlled to stop heating.

[0237] Specifically, when the lunch box is an aluminum foil box, and the wall thickness of the aluminum foil box is 0.05-0.3mm, the wall thickness of the aluminum foil box body can preferably be set between 0.08-0.15mm, especially when the ingredients to be cooked stored in the aluminum foil box are solid ingredients or semi-fluid ingredients, it is easy to cause the aluminum foil box to melt through. Because when an electromagnetic coil is used to heat an aluminum foil box with a thinner wall, it is not easy to melt through when the ingredients are liquid (or food with a large proportion of liquid, such as spicy hot pot, soup noodles, etc.). The reason is that the liquid has a large contact area with the box body and the contact is good. The liquid has a large heat capacity and fast heat conduction, and can quickly transfer the heat on the box body to the ingredients, avoiding excessive heat or heat concentration in the box body, and the risk of melting through is small; when heating solid or semi-fluid ingredients with a small proportion of liquid, the heat transfer speed is slow, resulting in heat concentration, and the food is easy to become partially mushy. Moreover, the thinner the lunch box, the lower the strength, the smaller the heat capacity, and the easier it is to melt through. Based on this, in the embodiment of the present application Because the aluminum foil box is located inside the heating chamber and is disposable, it is not convenient to place a temperature sensor to directly monitor the temperature of the aluminum foil box. By monitoring the heating power of the electromagnetic coil in real time and comparing the real-time average power with a preset safety threshold, a comparison strategy can be used to determine whether there is a risk of the lunch box melting through. This allows for timely detection of the risk of the lunch box melting through. At this time, the electromagnetic coil can be controlled to stop heating, and the heating chamber can be controlled to stop working, ending the frying process. Therefore, even if the aluminum foil box has a thin wall thickness and the heating power is too high, especially when heating solid or semi-fluid ingredients, the aluminum foil box is not easily melted through. It is understood that the aluminum foil box in the embodiment of the present application can also be used for steaming staple foods such as rice, and the cooked rice is less likely to become mushy.

[0238] In some embodiments, the real-time composite power is calculated using a moving weighted average method to obtain the real-time average power, which can accurately monitor the risk of abnormal power fluctuations causing the lunch box to melt through.

[0239] In some embodiments, step S320: comparing the real-time average power with a preset safety threshold and determining whether there is a risk of the lunch box melting through based on a comparison strategy, includes the following specific steps:

[0240] S321: If the real-time average power is higher than the preset safety threshold, it is determined that the heating is abnormal, and the number of heating abnormalities in the first time period is recorded and accumulated;

[0241] S322: Determine whether the accumulated number of heating abnormalities is greater than a set threshold;

[0242] S323: If the accumulated number of heating anomalies is greater than the set threshold, it is determined that there is a risk of the lunch box melting through.

[0243] Specifically, if the real-time average power is higher than the preset safety threshold, for example, the preset safety threshold is 1.2 times the rated power, the heating is judged to be abnormal, and the number of heating abnormalities within 10 seconds is recorded and accumulated; it is judged whether the accumulated number of heating abnormalities is greater than the set threshold; if the accumulated number of heating abnormalities is greater than the set threshold, for example, the accumulated number of heating abnormalities within 10 seconds exceeds 8 times, it is judged that there is a risk of the lunch box melting through.

[0244] In an embodiment of the present application, the heating power of the electromagnetic coil is monitored in real time by obtaining the current and voltage values ​​of the electromagnetic coil heating. For example, the real-time composite power can be calculated once for the current and voltage values ​​of the electromagnetic coil heating every 100ms, and the real-time composite power is calculated using a moving weighted average method to obtain the real-time average power; the real-time average power is compared with a preset safety threshold, and according to a comparison strategy, for example, if the real-time average power is higher than the preset safety threshold, a heating anomaly is determined, and the number of heating anomalies within 10 seconds is recorded and accumulated; it is determined whether the accumulated number of heating anomalies is greater than the set threshold; if the accumulated number of heating anomalies is greater than the set threshold, for example, if the accumulated number of heating anomalies within 10 seconds exceeds 8 times, it is determined that there is a risk of the lunch box melting through. At this time, the electromagnetic coil can be controlled to stop heating, and the heating chamber can be controlled to stop working, and the frying is terminated, indicating that the grid voltage fluctuation is large, which has a great impact on the frying, and there is a risk of the lunch box melting through. This not only prevents the risk of contaminating the heating chamber due to the aluminum foil box melting through, but also avoids malfunction and damage to the entire vending machine equipment. In addition, under this technical solution, the aluminum foil box with a thinner wall thickness can be suitable for cooking solid or semi-fluid ingredients.

[0245] In some embodiments, the ingredients to be cooked may include solid ingredients or semi-fluid ingredients; wherein the semi-fluid ingredients are a mixture of solid and liquid, and the solid and liquid can be separated from each other; or, the semi-fluid ingredients are a mixture of solid and liquid that cannot be separated; and the proportion of the mass of the liquid in the semi-fluid ingredients to the total mass is less than 30%. Specifically, semi-fluid ingredients refer to a type of food that is between solid ingredients and liquid ingredients. In the embodiment of the present application, when the electromagnetic coil is used to directly heat the box body, the semi-fluid ingredients that can be cooked are as follows: a. Semi-fluid ingredients are a mixture of solid and liquid, and the solid and liquid can be separated from each other, and the proportion of the mass of the liquid to the total mass is less than 30%, such as pasta, porridge, etc.; b. Semi-fluid ingredients are viscous ingredients in which the solid and liquid cannot be separated, such as sesame paste, mashed potatoes, etc.

[0246] The above describes the implementation of the embodiments of the present application and the advantages brought by them through multiple embodiments. The following describes the specific processing process of the embodiments of the present application in detail with reference to Figures 35-37 in conjunction with specific examples.

[0247] 1. The temperature compensation process is as follows:

[0248] S11: receiving the frying process;

[0249] S12: Obtain the category of the stir-fried dish according to the received stir-frying process;

[0250] S13: Obtaining the temperature inside the chamber;

[0251] S14: Compare the temperature inside the chamber with the set reference temperature; if the temperature inside the chamber is lower than the set reference temperature, proceed to the next step; otherwise, jump to step S16;

[0252] S15: If the temperature inside the bin is lower than the set reference temperature, the cold bin compensation curve is executed and the process goes to step S17;

[0253] S16: If the temperature inside the chamber is higher than the set reference temperature, the hot chamber compensation curve is executed;

[0254] S17: The temperature compensation curve is sent to the heating chamber together with the frying process.

[0255] For example: when cooking clay pot rice, before temperature compensation, use a cold chamber (for example, the initial temperature inside the chamber is 20°C) to cook the clay pot rice, and the temperature of the clay pot rice after cooking is 70-80°C; with the same cooking process, use a hot chamber (for example, the initial temperature inside the chamber is 60°C) to cook the clay pot rice, and the temperature of the clay pot rice after cooking is 80-85°C, and the cooking effect of the hot chamber meets the corresponding requirements, and the food tastes better after cooking, so the initial temperature T of the chamber cooked in the hot chamber (such as 60°C) can be used as the set reference temperature T0.

[0256] Therefore, it is necessary to perform energy compensation on the cold chamber (the initial temperature inside the chamber is lower than the set reference temperature), such as increasing the input power of the heating chamber, setting the duration to t1, increasing the power to ΔP, and replenishing the energy to Q1 = ΔP × t; t1 changes linearly with the temperature inside the chamber. The lower the actual initial temperature T inside the chamber, the longer the duration t1, and the closer the initial temperature T inside the chamber is to the set reference temperature T0, the shorter the duration, and the duration t1 = a1 × (T0-T). In this way, the temperature of the clay pot rice after cooking in the cold chamber can reach about 80-85°C, which is the same as the temperature of the clay pot rice after cooking in the hot chamber (such as 60°C). It can be seen that the heat compensation for the cold chamber is Q1 = ΔP × a1 × (T0-T);

[0257] Similarly, for a high-temperature chamber (the initial temperature inside the chamber is higher than the set reference temperature), that is, when the initial chamber temperature T (such as 100°C) is higher than the set reference temperature T0 (60°C), energy reduction compensation is required. The reduced power ΔP, duration t2, and energy reduction Q2 = -ΔP×t2; then the duration t2 = a2×(T-T0), and the heat compensation for the high-temperature chamber Q2 = -ΔP×a2×(T-T0), is energy reduction compensation. In this way, the temperature of the clay pot rice cooked in the high-temperature chamber can reach about 80-85°C. Among them, a1 and a2 are temperature compensation coefficients, and the cold chamber compensation curve and the hot chamber compensation curve are duration curves, which are mainly reflected in the difference in the size of the temperature compensation coefficient. Since different dishes have different frying processes and different ways of energy exchange, the power compensation schemes used need to be differentiated; for example, different compensation curves can be used for stir-fried ingredients and non-stir-fried ingredients.

[0258] 2. The processing process of power closed-loop control is as follows:

[0259] S21: The heating chamber performs the frying process and inputs the heating power P of the electromagnetic coil;

[0260] S22: obtaining the current value and voltage value of the electromagnetic coil heating in the first time period, and calculating the current value and voltage value of the electromagnetic coil heating according to a preset interval frequency to obtain the real-time synthetic power P1-Pn of the electromagnetic coil heating;

[0261] S23: Calculate using a weighted average method to obtain the real-time average power Pa;

[0262] S24: Calculating the difference ΔP between the input heating power and the real-time average power;

[0263] S25: The heating chamber executes the adjusted power P';

[0264] S26: Determine whether the frying time has ended; if the frying time has not ended, proceed to the next step; otherwise, jump to step S29;

[0265] S27: If the frying time has not ended, obtain the current value and voltage value of the electromagnetic coil heating in the next time period, and calculate the real-time synthetic power according to the preset interval frequency;

[0266] S28: Calculate using a moving weighted average method to obtain the real-time average power Pa; then repeat steps S24-S26;

[0267] S29: When the frying is finished, the electromagnetic coil is controlled to stop heating, and the heating chamber is controlled to stop working.

[0268] For example, every 300 ms, the current and voltage of the electromagnetic coil are reported once through the monitoring circuit board, and the real-time combined power P1 can be obtained according to the current and voltage values. After 3 s, the system can collect P1 - P10, a total of 10 real-time combined power data. At this time, the 10 real-time combined power data are weighted and averaged to obtain the real-time average power Pa = (P1 + P2 + ··· + P10) / 10. The real-time average power Pa is compared with the current input power P. If Pa < P, the power difference ΔP = P - Pa. The power difference ΔP is summed with the current input power P to obtain the adjusted power P' = P + ΔP. On the contrary, when Pa > P, the adjusted power P' = P - ΔP. In addition, the real-time combined power data can be subjected to moving weighted averaging to achieve dynamic adjustment of the input power. For example, after 3.3 s, the system can collect P2 - P11, a total of 10 real-time combined power data. At this time, the 10 real-time combined power data are weighted and averaged to obtain the dynamic real-time average power Pa = (P2 + P3 + ··· + P11) / 10, that is, the real-time average power can be calculated according to the preset interval frequency. The number of real-time combined power data used is fixed. After new data is collected, the earliest collected data before is not used to avoid the abnormal fluctuations of power being averaged due to too much data used, which is not conducive to monitoring.

[0269] III. The control process for preventing the lunch box from melting through is as follows:

[0270] S31: The heating chamber executes the frying process;

[0271] S32: Read the current and voltage and calculate the combined power;

[0272] Read the current value and voltage value of the electromagnetic coil heating in real time, and calculate the current value and voltage value of the electromagnetic coil heating according to the preset interval frequency to obtain the real-time combined power of the electromagnetic coil heating.

[0273] S33: Perform moving weighted averaging on the real-time combined power;

[0274] S34: Compare the current real-time average power with the target value to determine whether the current real-time average power exceeds the safety range;

[0275] The target value is, for example, the set rated power, and the safety range is, for example, 1.2 times the rated power. Determine whether the current real-time average power exceeds the safety range. If it exceeds the safety range, proceed to the next step. If it does not exceed the safety range, execute step S37.

[0276] S35: If it exceeds the safety range, it is determined that the heating is abnormal, and the number of abnormal times is recorded and accumulated;

[0277] S36: Determine whether the accumulated number of abnormal times is greater than the set value;

[0278] Among them, if the accumulated number of abnormalities is greater than the set value, the abnormality is reported and the frying ends; if the accumulated number of abnormalities is not greater than the set value, the next step is executed.

[0279] S37: Execute power closed-loop control; the real-time average power may continue to be monitored to see if it exceeds a set threshold. If it exceeds 1.1 times the set threshold, the current input power may be corrected to keep the input power within the set threshold, thereby achieving uniform heating of thin-walled aluminum foil boxes. Alternatively, steps S21-S27 above may be executed to achieve power closed-loop control.

[0280] S38: Continue to perform the stir-frying process; according to the set parameters such as heating time, temperature, power, stir-frying speed, etc., the ingredients in the aluminum foil box are evenly heated to improve the taste of the cooked food.

[0281] S39: The frying is finished; that is, the electromagnetic coil is controlled to stop heating, and the heating chamber is controlled to stop working.

[0282] For example, when using a 0.1mm-thick aluminum foil container as a heating container to hold ingredients for cooking, the container has a certain upper limit on the power it can withstand. If this limit is exceeded, the container may melt through. Therefore, to prevent melting through caused by abnormal voltage fluctuations in the power grid, real-time power monitoring is required. If the power exceeds a certain range within a certain period of time, an abnormality is reported and heating of the container is stopped. For example, a 0.1mm-thick aluminum foil container will melt through after 10 minutes of dry heating at 350W. The higher the power, the shorter the time to melt through; for example, at 1000W, melting through occurs in about 3 seconds.

[0283] Although the embodiments of the present application described above can perform closed-loop power control, abnormal power fluctuations will be averaged out and weakened. However, the power surge can sometimes be extremely high due to the impact on the power grid. During the cooking process of clay pot rice, the temperature and power curves of the aluminum foil box are shown in Figure 38. Clay pot rice does not need to be stir-fried during cooking, so the upper cover has almost no contact with the ingredients. Among them, temperature curve g shows the temperature change of the bottom box over time when it is heated, and the rising process is relatively gentle; temperature curve f shows the temperature change of the upper cover over time when it is heated, and the rising slope of the curve is large, that is, temperature curve f rises faster and higher than temperature curve g. The power curve e shows the power variation over time when the bottom box is heated. The instantaneous power fluctuates greatly from 17:50:16 to 17:54:01, and is relatively stable in subsequent time periods. The power curve h shows the power variation over time when the upper cover is heated. The power is relatively stable from 17:50:16 to 17:55:53, and fluctuates greatly in the subsequent time periods. During the cooking process of clay pot rice, the power curve e of the bottom box can be used as the main monitoring data to assess whether there is a risk of the lunch box melting through, and the power curve h of the upper cover can be used as reference monitoring data. It can be seen that the system can collect statistics for different power ranges. For example, if the input power is set to 350W, power closed-loop control can be implemented when the monitored real-time power is within the range of 350-400W; when the monitored real-time power is within the range of 400-500W, if the real-time power exceeds the set input power of 350W for 10 times every 10S, an abnormality must be reported, that is, there is a risk of the lunch box melting through, and the electromagnetic coil heating should be stopped at this time; and for the monitored real-time power in a higher range, such as 500-800W, more stringent monitoring methods can be adopted. If the real-time power exceeds the set input power of 350W for 6 times every 10S, an abnormality must be reported, that is, there is a risk of the lunch box melting through, and the electromagnetic coil heating should be stopped at this time; when the monitored real-time power is above 800W, the number of monitored abnormalities is set to be as small as possible, etc. This method can effectively solve the problem of lunch box melting through caused by abnormal power fluctuations.

[0284] Corresponding to the method embodiment of the present application, the present application also provides an electromagnetic heating control device, as shown in FIG39 , comprising:

[0285] A first acquisition module 510 is used to acquire a cooking process;

[0286] A category module 520 is used to obtain the category of the ingredients to be cooked based on the acquired cooking process;

[0287] A second acquisition module 530 is used to obtain the initial temperature of the heating chamber;

[0288] A comparison module 540 is configured to compare the obtained initial temperature inside the chamber with a set reference temperature;

[0289] A compensation module 550 is configured to obtain a temperature compensation strategy based on a comparison result between the initial temperature in the chamber and a set reference temperature and the type of food to be cooked;

[0290] The sending module 560 is used to send the cooking process and temperature compensation strategy to the corresponding heating chamber so that the heating chamber executes the cooking process and temperature compensation strategy; wherein, the heating chamber uses an electromagnetic coil to heat the lunch box, and a lunch box is provided in the chamber body of the heating chamber, and the lunch box contains ingredients to be cooked.

[0291] Using electromagnetic heating technology to heat lunch boxes can currently be divided into the following three heating methods: the first is direct heating of magnetic materials, such as using iron materials to make lunch boxes. However, iron lunch boxes are thick and expensive in the vending industry. The second is adding a magnetic sheet to the bottom of the aluminum foil lunch box. For example, if the magnetic sheet is set as an iron sheet, this is expensive, the process is complicated, and the heating speed is slow. The third is direct heating of the aluminum foil lunch box, which is low-cost and has been widely used in the vending industry. However, when the thickness of the aluminum foil lunch box is thin, on the one hand, the lunch box has poor structural strength and is prone to deformation. On the other hand, it leads to poor heating effect of the ingredients and is prone to localized mushy. When the lunch box is too thick, on the one hand, the cost increases, and on the other hand, the heating efficiency will decrease. Due to the hysteresis of heat transfer due to the skin effect, the heating speed of the aluminum foil lunch box will slow down, affecting the heating speed and heating effect of the ingredients.

[0292] In view of this, an embodiment of the present application provides an aluminum foil box for electromagnetic coil heating, as shown in Figure 40, comprising: a box body 11, which is provided with a accommodating cavity for storing ingredients to be cooked; the box body 11 includes a bottom and a side wall connected to the bottom, and the angle between the side wall and the horizontal plane where the bottom is located is set to an obtuse angle; the wall thickness of the box body 11 is set to 0.05mm-0.3mm; the outer wall of the box body 11 is in contact with the electromagnetic coil 12, and when the electromagnetic coil 12 is used to heat the box body 11, the ingredients to be cooked contained in the box body 11 can be cooked.

[0293] Specifically, the side walls of the box body 11 are set to be slightly inclined outward to increase the volume of the accommodating cavity, so that more food can be stored; compared with the lunch box in which the side walls of the box body 11 are perpendicular to the bottom, the aluminum foil box in the embodiment of the present application is less deformed by the stored food; by setting a reasonable wall thickness of the box body 11, the structural strength of the aluminum foil box is better and not easy to deform, and the production cost is low. When the electromagnetic coil 12 is used to directly heat the box body 11, the heating effect of the food is better, and the phenomenon of the cooked food becoming mushy during the heating process can be avoided, and the heating speed of the box body 11 can be increased. The box body 11 can realize heat transfer to improve the heating speed and heating effect of the food, thereby improving the heating efficiency.

[0294] In some embodiments, in order to improve the structural strength of the aluminum foil box and save production costs, the wall thickness of the box body 11 is preferably set to a range of 0.08 mm to 0.15 mm.

[0295] In an exemplary embodiment, as shown in FIG41 , the cooking effect when the wall thickness of the box body 11 is 0.05 mm is not difficult to see from FIG41 that a small area of ​​the bottom of the box body 11 contains mushy food. In addition, for example, the dimensions of the length, width, and height of the box body 11 are specifically 160×100×60 mm. As shown in FIG42 , the relationship between the deformation (mm) and the wall thickness (mm) of the aluminum foil box under 1 kg of food is shown. The ordinate is the deformation percentage of the box body 11, that is, the percentage of the deformation of the box body 11 / the wall thickness. The abscissa is the wall thickness of the aluminum foil box. The curve shows the trend of the deformation of the aluminum foil box. It can be seen from the data in FIG42 that when the wall thickness of the aluminum foil box is less than 0.05 mm, the deformation percentage of the aluminum foil box exceeds 20%. As the wall thickness continues to increase, the deformation percentage increases. The ratio is getting smaller and smaller. When the wall thickness is greater than 0.15mm, the deformation of the box body 11 caused by 1Kg of food squeezing the box body 11 is less affected. The thicker the wall, the greater the cost and difficulty of processing. Therefore, the wall thickness of the box body 11 can be set between 0.05-0.3mm, and preferably the wall thickness range of the box body 11 can be set between 0.08-0.15mm. At this time, the strength and economy of the aluminum foil box are better. Moreover, when the electromagnetic coil 12 is used to directly heat the box body 11, the heating effect of the food is better, and it is not easy for the food to become mushy during the heating process.

[0296] In some embodiments, the side wall includes a first side wall and a second side wall, and the two sides of the first side wall are respectively connected to the bottom and the second side wall; wherein the angle between the first side wall and the horizontal plane where the bottom is located is smaller than the angle between the second side wall and the horizontal plane where the bottom is located.

[0297] Specifically, the first side wall and the second side wall of the box body 11 are set to be gradually inclined slightly outward from bottom to top. This setting is consistent with the force of food squeezing the box body 11 outward. This not only increases the volume of the accommodating cavity, but also reduces the deformation of the box body 11 caused by the stored food, thereby improving the structural strength of the box body 11.

[0298] In an exemplary embodiment, the angle between the first side wall and the horizontal plane where the bottom is located is set to 95-105 degrees; the angle between the second side wall and the horizontal plane where the bottom is located is set to 98-110 degrees.

[0299] Specifically, the connection between the first side wall and the second side wall of the box body 11 can be set to a protruding arc, and the protruding surface of the arc can be set to face the accommodating cavity. For example, the angle between the first side wall and the horizontal plane where the bottom is located is set to 95 degrees, and the angle between the second side wall and the horizontal plane where the bottom is located is set to 100 degrees. Such an inclination angle can not only increase the volume of the accommodating cavity, but also reduce the compression deformation of the box body 11 by the stored food, thereby improving the structural strength of the box body 11.

[0300] In some embodiments, the box body 11 of the aluminum foil box may include a box cover and a bottom box, the box cover is provided with a protruding first edge, the bottom box is provided with a protruding second edge, the first edge is buckled on the second edge to seal the box cover and the bottom box; the cross-sections of the box cover and the bottom box can be set to be trapezoidal by cutting along the length direction or the width direction.

[0301] At present, in the related technology, thin aluminum foil lunch boxes are directly heated by electromagnetic heating. Due to the thin thickness of the aluminum foil lunch box, when the heating power is too large, especially when heating solid food and viscous food, there is a problem that the aluminum foil lunch box is easy to melt through, resulting in only liquid food being able to be heated.

[0302] In view of this, an embodiment of the present application provides a control method for electromagnetic coil heating, based on the above-mentioned aluminum foil box for electromagnetic coil heating, as shown in FIG44 , which may include the following specific steps:

[0303] S110: placing the aluminum foil box into a heating chamber so that the heating chamber performs a corresponding frying process; wherein the heating chamber uses an electromagnetic coil to heat the aluminum foil box, and the aluminum foil box contains ingredients to be cooked;

[0304] S120: Obtaining a current value and a voltage value of the electromagnetic coil heating in the first time period, and calculating the current value and the voltage value of the electromagnetic coil heating according to a preset interval frequency to obtain a real-time synthetic power of the electromagnetic coil heating;

[0305] S130: Calculate the real-time composite power to obtain the real-time average power;

[0306] S140: Compare the real-time average power with a preset safety threshold, and determine whether there is a risk of the lunch box melting through based on the comparison strategy;

[0307] S150: When it is determined that there is a risk of the lunch box melting through, the electromagnetic coil is controlled to stop heating.

[0308] Specifically, since the aluminum foil box is located inside the body of the heating chamber and the aluminum foil box is disposable, it is not convenient to arrange a temperature sensor to directly monitor the temperature of the aluminum foil box. By real-time monitoring of the heating power of the electromagnetic coil, the real-time average power is compared with the preset safety threshold, and according to the comparison strategy, for example, when the real-time average power is higher than the preset safety threshold, the preset safety threshold can be set to a certain range of values ​​higher than the rated power, and it can be determined that there is a risk of the lunch box melting through. In this way, the risk of the lunch box melting through can be discovered in time. At this time, the electromagnetic coil can be controlled to stop heating, and further, the heating chamber can be controlled to stop working and the frying can be ended. Therefore, even if the wall thickness of the aluminum foil box is thin, for example, the wall thickness is 0.05-0.3mm, when the heating power is too large, especially when heating solid food or semi-fluid food, the aluminum foil box is not easy to melt through.

[0309] In some embodiments, the real-time composite power may be calculated using a moving weighted average method to obtain the real-time average power.

[0310] In some embodiments, step S140: comparing the real-time average power with a preset safety threshold and determining whether there is a risk of the lunch box melting through based on a comparison strategy may include the following specific steps:

[0311] S141: If the real-time average power is higher than the preset safety threshold, it is determined that the heating is abnormal, and the number of heating abnormalities in the first time period is recorded and accumulated;

[0312] S142: Determine whether the accumulated number of heating anomalies is greater than a set threshold;

[0313] S143: If the accumulated number of heating anomalies is greater than the set threshold, it is determined that there is a risk of the lunch box melting through.

[0314] Specifically, if the real-time average power is higher than the preset safety threshold, for example, the preset safety threshold is 1.2 times the rated power, the heating is judged to be abnormal, and the number of heating abnormalities within 10 seconds is recorded and accumulated; it is judged whether the accumulated number of heating abnormalities is greater than the set threshold; if the accumulated number of heating abnormalities is greater than the set threshold, for example, the accumulated number of heating abnormalities within 10 seconds exceeds 8 times, it is judged that there is a risk of the lunch box melting through.

[0315] In some embodiments, step S120: obtaining the current value and voltage value of the electromagnetic coil heating in the first time period, and calculating the current value and voltage value of the electromagnetic coil heating according to a preset interval frequency to obtain the real-time synthetic power of the electromagnetic coil heating, includes:

[0316] The current and voltage values ​​of the electromagnetic coil heating are calculated once every 50-300ms.

[0317] In an embodiment of the present application, the vending machine may include a refrigerator and a stir-fry cabinet. The refrigerator may store aluminum foil boxes to be cooked, and the aluminum foil boxes to be cooked may store fresh pre-processed ingredients. The stir-fry cabinet may be provided with multiple heating chambers, and the pre-processed ingredients may be stir-fried on-site using the heating chambers or other cooking methods to improve the taste and freshness of the food.

[0318] The corresponding heating chamber 20 is selected based on the stir-frying process, and the aluminum foil container to be cooked is placed in the corresponding heating chamber 20. The heating chamber can utilize electromagnetic coil heating. As shown in Figure 43, the heating chamber 20 comprises a chamber body 202 and a chamber door 201. A heating chamber is located within the chamber body, accommodating the aluminum foil container 10 to be cooked. The chamber door 201 is configured to move up and down. When the chamber door 201 descends to a first position, it seals the heating chamber. When the chamber door 201 ascends to a second position, the aluminum foil container to be cooked can enter the heating chamber for heating, or the cooked aluminum foil container can be removed. The heating chamber 20 can also be equipped with a drive mechanism to enable rotation, thereby rotating the aluminum foil container 10 to stir the ingredients within. The main controller can set different parameters such as heating time, temperature, power, and stir-frying speed based on the type of ingredients to be cooked, ensuring uniform high-temperature stir-frying of the ingredients, fully inducing the Maillard reaction, and enhancing the taste. The electromagnetic coil and drive mechanism are connected to a main controller to control the electromagnetic coil heating to stop and the heating chamber to stop operating when the stir-frying is completed. A processor can be connected to the main controller and configured to send instructions to the main controller to start the drive mechanism (e.g., a motor) and / or start the electromagnetic coil heating, etc., which are not listed here one by one.

[0319] In an embodiment of the present application, the heating power of the electromagnetic coil is monitored in real time by obtaining the current and voltage values ​​of the electromagnetic coil heating. For example, the real-time synthetic power can be calculated once for the current and voltage values ​​of the electromagnetic coil heating every 100ms, and the real-time synthetic power is calculated using a moving weighted average method to obtain the real-time average power; the real-time average power is compared with a preset safety threshold, and according to a comparison strategy, for example, if the real-time average power is higher than the preset safety threshold, a heating anomaly is determined, and the number of heating anomalies within 10 seconds is recorded and accumulated; it is determined whether the accumulated number of heating anomalies is greater than the set threshold; if the accumulated number of heating anomalies is greater than the set threshold, for example, the accumulated number of heating anomalies within 10 seconds exceeds 8 times, it is determined that there is a risk of the lunch box melting through. At this time, the electromagnetic coil can be controlled to stop heating, and further, the heating chamber can be controlled to stop working, and the frying is terminated, indicating that the grid voltage fluctuation is large, which has a great impact on the frying, and there is a risk of the lunch box melting through. This not only prevents the risk of contaminating the heating chamber due to the aluminum foil box melting through, but also avoids malfunction and damage to the entire vending machine equipment. In addition, under this technical solution, the aluminum foil box with a thinner wall thickness can be suitable for cooking solid or semi-fluid ingredients.

[0320] In some embodiments, the food to be cooked may include solid food or semi-fluid food; wherein the semi-fluid food is a mixture of solid and liquid, and the solid and liquid can be separated from each other; or, the semi-fluid food is a mixture of solid and liquid that cannot be separated; and the proportion of liquid mass in the semi-fluid food to the total mass is less than 30%.

[0321] Specifically, semi-fluid ingredients refer to a type of food that is between solid and liquid. In the embodiment of the present application, when the electromagnetic coil is used to directly heat the box body, the following semi-fluid ingredients can be cooked: a. Semi-fluid ingredients are a mixture of solid and liquid, where the solid and liquid can be separated, and the liquid mass accounts for less than 30% of the total mass, such as pasta and porridge; b. Semi-fluid ingredients are viscous ingredients where the solid and liquid cannot be separated, such as sesame paste and mashed potatoes. When an electromagnetic coil is used to heat an aluminum foil box with a thin wall thickness, and the food is liquid (or food with a large proportion of liquid, such as spicy hot pot, noodle soup, etc.), it is not easy to melt through. The reason is that the liquid has a large and good contact area with the box body, the liquid has a large heat capacity and fast thermal conductivity, and can quickly transfer the heat on the box body to the food, avoiding excessive heat or heat concentration in the box body, and the risk of melting through is small; when heating solid or semi-fluid food with a small proportion of liquid, the heat transfer speed is slow, resulting in heat concentration, and the food is prone to localized mushy. In addition, the thinner the lunch box, the lower the strength and the smaller the heat capacity, and the easier it is to melt through. Based on this, in the embodiment of the present application, by real-time monitoring of the heating power of the electromagnetic coil, the real-time average power is compared with a preset safety threshold, and according to the comparison strategy, it is possible to determine whether there is a risk of melting through the lunch box. In this way, the risk of melting through the lunch box can be detected in time. At this time, the electromagnetic coil can be controlled to stop heating, and the heating chamber can be controlled to stop working, and the frying is ended. Therefore, even if the wall thickness of the aluminum foil box is thin and the heating power is too high, especially when heating solid food or semi-fluid food, the aluminum foil box is not easy to melt through. It is understandable that the aluminum foil box in the embodiment of the present application can also be used for steaming and cooking staple foods such as rice, and the cooked rice is not prone to becoming mushy.

[0322] In some embodiments, when an electromagnetic coil is used to heat the box, the inductance is set to 30-200 μH and the frequency is set to 10-50 kHz. By properly setting the electromagnetic coil heating parameters, when cooking solid or semi-fluid ingredients, thinner aluminum foil boxes can be heated more evenly by setting reasonable electromagnetic heating parameters, such as setting the inductance to 30-200 μH and the frequency to 10-50 kHz.

[0323] The above describes the implementation of the embodiments of the present application and the advantages brought by them through multiple embodiments. The following describes the specific processing process of the embodiments of the present application in detail with reference to specific examples.

[0324] Another electromagnetic coil heating control method provided in an embodiment of the present application, based on the aluminum foil box for electromagnetic coil heating described above, as shown in FIG45 , may include the following specific steps:

[0325] S210: frying is performed;

[0326] The aluminum foil box can be placed in a heating chamber, and the heating chamber performs a corresponding frying process according to the menu selection; wherein the heating chamber uses an electromagnetic coil to heat the aluminum foil box, and the aluminum foil box stores the ingredients to be cooked.

[0327] S220: Read current and voltage and calculate synthetic power;

[0328] The current value and voltage value of the electromagnetic coil heating are read in real time, and the current value and voltage value of the electromagnetic coil heating are calculated according to a preset interval frequency to obtain the real-time synthetic power of the electromagnetic coil heating.

[0329] S230: Performing a moving weighted average on the real-time composite power;

[0330] For example, every 300ms, the current and voltage of the electromagnetic coil are reported once through the monitoring circuit board, and the real-time synthetic power P1 can be obtained based on the current and voltage values; after 3s, the system can collect P1--P10, a total of 10 real-time synthetic power data, and at this time, the 10 real-time synthetic power data will be weighted averaged to obtain the real-time average power Pa=(P1+P2+···+P10) / 10; after 3.3s, the system can collect P2--P11, a total of 10 real-time synthetic power data, and at this time, the 10 real-time synthetic power data will be weighted averaged to obtain the dynamic real-time average power Pa=(P2+P3+···+P11) / 10, that is, the real-time average power can be calculated according to the preset interval frequency, and the number of real-time synthetic power data used is fixed. After collecting and adding new data, the previously collected data will not be used to avoid the abnormal fluctuation of power caused by excessive use of data being averaged and not conducive to monitoring.

[0331] S240: Compare the current real-time average power with the target value to determine whether the current real-time average power exceeds a safe range;

[0332] The target value is, for example, the set rated power, and the safety range is, for example, 1.2 times the rated power. Determine whether the current real-time average power exceeds the safety range; if it exceeds the safety range, execute the next step; if it does not exceed the safety range, execute step S270.

[0333] S250: If it exceeds the safety range, it is determined to be a heating abnormality, and the number of abnormalities is recorded and accumulated;

[0334] S260: Determine whether the accumulated number of abnormalities is greater than the set value;

[0335] Among them, if the accumulated number of abnormalities is greater than the set value, report the abnormality and end the frying; if the accumulated number of abnormalities is not greater than the set value, perform the next step.

[0336] S270: Perform power closed-loop control; among them, it is possible to continue to monitor whether the real-time average power exceeds the set threshold. When it exceeds 1.1 times the set threshold, the current input power can be corrected to control the input power within the set threshold range to achieve uniform heating of the aluminum foil box with a relatively thin wall thickness.

[0337] For example, compare the real-time average power Pa with the current input power P. If Pa < P, the power difference ΔP = P - Pa. Sum the power difference ΔP and the current input power P, then the adjusted power P' = P + ΔP; conversely, when Pa > P, the adjusted power P' = P - ΔP. Perform a moving weighted average on the real-time combined power data to achieve dynamic adjustment of the input power.

[0338] S280: Continue to perform the frying process; according to the set parameters such as heating time, temperature, power, and frying speed, make the ingredients in the aluminum foil box evenly heated to improve the taste of the cooked food.

[0339] S290: End the frying; that is, control the electromagnetic coil to stop heating and control the heating chamber to stop working.

[0340] Corresponding to the method embodiment of the present application, the embodiment of the present application further provides a control device for electromagnetic coil heating. Based on the aluminum foil box for electromagnetic coil heating, as shown in FIG. 46, specifically, it may include:

[0341] A frying module 510, which is used to put the aluminum foil box into the heating chamber to make the heating chamber perform the corresponding frying process; among them, the heating chamber uses an electromagnetic coil to heat the aluminum foil box, and the aluminum foil box stores the ingredients to be cooked;

[0342] An acquisition module 520, which is used to acquire the current value and voltage value of the electromagnetic coil heating in the first time period, and calculate the current value and voltage value of the electromagnetic coil heating at a preset interval frequency to obtain the real-time combined power of the electromagnetic coil heating;

[0343] A calculation module 530, which is used to calculate the real-time combined power by means of moving weighted average to obtain the real-time average power;

[0344] A determination module 540, which is used to compare the real-time average power with a preset safety threshold and judge whether there is a risk of the lunch box melting through according to the comparison strategy;

[0345] The control module 550 is used to control the electromagnetic coil to stop heating when it is determined that there is a risk of the lunch box melting through.

[0346] The electronic device in the embodiments of the present application can be a user terminal device, a server, another computing device, or a cloud server. Figure 47 shows a schematic diagram of the hardware structure of the electronic device in the embodiments of the present application. The electronic device can include a processor 601 and a memory 602 storing computer program instructions. When the processor 601 executes the computer program instructions, it implements the process or function of any of the above-mentioned embodiments.

[0347] Specifically, the processor 601 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application. The memory 602 may include a large-capacity memory for data or instructions. For example, the memory 602 may be at least one of the following: a hard disk drive (HDD), a read-only memory (ROM), a random access memory (RAM), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a tape, a universal serial bus (USB) drive, or other physical / tangible memory storage device. For another example, the memory 602 may include a removable or non-removable (or fixed) medium. For another example, the memory 602 may be inside or outside the integrated gateway disaster recovery device. The memory 602 may be a non-volatile solid-state memory. In other words, the memory 602 typically includes a tangible (non-transitory) computer-readable storage medium (such as a memory device) encoded with computer-executable instructions, and when the software is executed (such as by one or more processors), the operations described in the method of the embodiments of the present application may be performed. The processor 601 implements the process or function of any method in the above embodiments by reading and executing computer program instructions stored in the memory 602.

[0348] In one example, the electronic device shown in FIG47 may further include a communication interface 603 and a bus 610. The processor 601, the memory 602, and the communication interface 603 are connected via the bus 610 and communicate with each other. The communication interface 603 is primarily used to implement communication between the various modules, devices, units, and / or devices in the embodiments of the present application. The bus 610 includes hardware, software, or both, and can couple the components of the online data traffic metering device to each other. For example, the bus may include at least one of the following: an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industrial Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industrial Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Area Bus (VLB) bus, or other suitable buses. The bus 610 may include one or more buses. Although the embodiments of the present application describe or illustrate a specific bus, the embodiments of the present application may consider any suitable bus or interconnection method.

[0349] In combination with the method in the above embodiments, an embodiment of the present application also provides a computer-readable storage medium, which stores computer program instructions. When the computer program instructions are executed by a processor, they implement the process or function of any method in the above embodiments.

[0350] In addition, an embodiment of the present application further provides a computer program product, which stores computer program instructions. When the computer program instructions are executed by a processor, the process or function of any one of the methods in the above embodiments is implemented.

[0351] The flowcharts and / or block diagrams of the methods, devices, systems and computer program products of the embodiments of the present application are described above by way of example, and various aspects thereof are described. It should be understood that each box in the flowchart and / or block diagram or a combination thereof may be implemented by computer program instructions, or may be implemented by dedicated hardware that performs a specified function or action, or may be implemented by a combination of dedicated hardware and computer instructions. For example, these computer program instructions may be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to form a machine that enables these instructions executed by such a processor to enable the implementation of the functions / actions specified in each box in the flowchart and / or block diagram or a combination thereof. Such a processor may be a general-purpose processor, a special-purpose processor, a special application processor or a field programmable logic circuit.

[0352] The functional blocks shown in the block diagram of the embodiment of the present application can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc.; when implemented in software, it is a program or code segment used to perform the required task. The program or code segment can be stored in a memory or transmitted on a transmission medium or a communication link via a data signal carried in a carrier. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0353] It should be noted that the present application is not limited to the specific configurations and processes described above or shown in the figures. The above is only a specific implementation method of the present application. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the described system, device, module or unit can refer to the corresponding process in the method embodiment without further description. It should be understood that the scope of protection of the present application is not limited to this. Any technician familiar with the technical field can think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the scope of protection of the present application.

[0354] The above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention.

Claims

1. An electromagnetic bin assembly, comprising: A heating bin, which includes a heating cavity for accommodating a metal lunch box, wherein the metal lunch box includes at least one flat portion and at least one bent portion, and wherein the heating bin is configured such that the metal lunch box flips during the heating process; and A coil, which is configured to wind around the heating bin; Wherein, the heating bin and the coil are configured to reduce the difference in the magnetic field formed in the flat portion and the bent portion of the metal lunch box, so as to uniformly heat the food ingredients in the metal lunch box.

2. The electromagnetic bin assembly according to claim 1, wherein the heating bin includes a winding disc, which is configured to provide a plurality of wire grooves for the coil to wind around.

3. The electromagnetic bin assembly according to claim 2, wherein the winding disc includes a housing, the inner wall of the housing is used to cover the surface of the heating bin, the outer wall of the housing includes a first region and a second region, the first region is provided with wire grooves, the second region is not provided with wire grooves or the second region is provided with wire grooves but the groove pitch is greater than that of the wire grooves in the first region, the housing has a bent portion, and the second region at least covers the bent portion.

4. The electromagnetic bin assembly according to claim 1, wherein the heating bin includes: A bin body, which has a heating cavity for placing a lunch box; A winding disc, which is installed on the side of the bin body, the inner wall of the winding disc covers the side of the bin body, and wire grooves for arranging wires are provided on the outer wall of the winding disc to heat the lunch box placed in the bin body; wherein, the winding disc has a first region, and a plurality of first type wire grooves are provided in the first region, the first type wire grooves include straight wire grooves and arc-shaped wire grooves communicated with the straight wire grooves, the straight wire grooves are arranged to extend linearly along a first direction, and the straight wire grooves are spaced along a second direction, the arc-shaped wire grooves are arranged to extend in an arc shape along the second direction, and the arc-shaped wire grooves are spaced along the first direction, so that the wires arranged in the first type wire grooves are arranged in a plurality of runway shapes spaced from the inside to the outside; the first direction and the second direction are substantially perpendicular.

5. A food cooking device, which includes the electromagnetic bin assembly according to any one of claims 1-4.

6. A food vending device, which includes the electromagnetic bin assembly according to any one of claims 1-4.

7. A control method for electromagnetic heating, comprising: Putting a metal lunch box into the heating bin, wherein the heating bin uses an electromagnetic coil to heat the metal lunch box, and the metal lunch box stores food ingredients to be cooked; Starting the heating bin to execute the cooking process; And By controlling a plurality of parameters during the cooking process executed by the heating bin, to ensure that the cooking process is completed safely and accurately.

8. The method according to claim 7, further comprising: Obtaining the cooking process; According to the obtained cooking process, to obtain the category of food ingredients to be cooked; Obtaining the initial temperature inside the bin body of the heating bin; Comparing the obtained initial temperature inside the bin body with the set reference temperature; According to the comparison result of the initial temperature inside the bin body and the set reference temperature and the category of food ingredients to be cooked, to obtain a temperature compensation strategy; Send the cooking process and temperature compensation strategy to the corresponding heating chamber so that the heating chamber executes the cooking process and temperature compensation strategy.

9. The method according to claim 7, further comprising: Obtain the current value and voltage value of the electromagnetic coil heating within the first time period, and calculate the current value and voltage value of the electromagnetic coil heating at a preset interval frequency to obtain the real-time combined power of the electromagnetic coil heating; Calculate the real-time average power from the real-time combined power; Compare the real-time average power with a preset safety threshold, and judge whether there is a risk of the lunch box melting through according to the comparison strategy; When it is determined that there is a risk of the lunch box melting through, control the electromagnetic coil to stop heating.

10. A metal lunch box for electromagnetic coil heating, comprising: The box body, the material of which is aluminum foil and is provided with a receiving cavity for storing the ingredients to be cooked; the box body includes a bottom and a side wall connected to the bottom, and the included angle between the side wall and the horizontal plane where the bottom is located is set as an obtuse angle; the wall thickness of the box body is set to be 0.05mm - 0.3mm.

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