Energy-saving coffee roasting device based on waste heat circulation and its control method

Abstract

This invention relates to the field of energy-saving electrical appliance technology, specifically to an energy-saving coffee roasting equipment based on waste heat circulation and its control method. The method includes: activating waste heat circulation during the cooling phase, and also activating it during a preset first crack phase; determining the relative temperature deviation at the start of the preset first crack phase based on the difference between the surface temperature of the bottom heating element collected at the start of the preset first crack phase and the preset first crack temperature, thereby adaptively adjusting the heating power for the first time; and adaptively adjusting the heating power a second time based on the temperature changes within a preset observation period under the first power adjustment; similarly, adjusting the heating power for each subsequent adjustment after the second adjustment. This invention improves the rationality of adjusting the heating power during the first crack phase, thereby achieving energy savings during the first crack phase and improving the overall energy-saving effect of the coffee roasting equipment.

Description

Technical Field

[0001] This invention relates to the field of energy-saving electrical appliance technology, specifically to an energy-saving coffee roasting equipment based on waste heat recycling and its control method. Background Technology

[0002] Coffee roasting often requires a significant amount of heat, which is frequently lost directly into the air, resulting in energy waste. Some coffee roasting equipment incorporates a waste heat circulation system. By circulating hot air, the coffee beans are heated evenly, and the heat source provides additional heat, achieving energy savings, stabilizing the roasting temperature, and improving the quality of the roasted coffee beans.

[0003] Currently, because the temperature control requirements are relatively low during the cooling phase after roasting, energy-saving measures for coffee roasting equipment are usually implemented during this final cooling phase. However, since the coffee roasting process includes other stages besides the cooling phase, such as the first crack, relying solely on waste heat recycling during the cooling phase often results in poor overall energy efficiency for the coffee roasting equipment. Summary of the Invention

[0004] To address the technical problem of poor overall energy efficiency in coffee roasting equipment, this invention proposes an energy-saving coffee roasting equipment based on waste heat recycling and its control method.

[0005] In a first aspect, the present invention provides a control method for an energy-saving coffee roasting equipment based on waste heat recycling, the method comprising:

[0006] Based on the waste heat circulation being activated during the cooling phase, waste heat circulation is also activated during the preset first explosion phase. The relative temperature deviation at the start of the preset first explosion phase is determined based on the difference between the surface temperature of the bottom heating tube collected at the start of the preset first explosion phase and the preset first explosion temperature.

[0007] Based on the relative temperature deviation at the start time of the preset first explosion stage, the heating power is adaptively adjusted for the first time.

[0008] Based on the moment when the heating power is first adaptively adjusted, a preset observation period is constructed for the first power adjustment.

[0009] Based on the temperature changes during the preset observation period under the first power adjustment, the heating power is adaptively adjusted a second time.

[0010] Similarly, for each heating power adjustment after the second heating power adjustment within the preset first explosion stage, the following applies: adaptive adjustment of the heating power based on the temperature change within the preset observation period under the previous power adjustment.

[0011] In conjunction with the first aspect above, in one possible implementation, determining the relative temperature deviation at the start time of the preset first explosion stage based on the difference between the surface temperature of the bottom heating tube collected at the start time of the preset first explosion stage and the preset first explosion temperature includes:

[0012] The absolute value of the difference between the surface temperature of the bottom heating tube collected at the beginning of the preset first explosion stage and the preset first explosion temperature is determined as the temperature difference factor at the beginning of the preset first explosion stage.

[0013] The difference between the preset second explosion temperature and the preset first explosion temperature is determined as the stage temperature difference factor;

[0014] The relative temperature deviation at the start of the preset first explosion stage is determined based on the ratio of the temperature difference factor at the start of the preset first explosion stage to the stage temperature difference factor.

[0015] In conjunction with the first aspect above, in one possible implementation, the first adaptive adjustment of the heating power based on the relative temperature deviation at the preset start time of the first explosion stage includes:

[0016] The difference between the surface temperature of the bottom heating tube collected at the start time of the preset first explosion stage and the preset first explosion temperature is determined as the initial temperature difference index, and the relative temperature deviation at the start time of the preset first explosion stage is determined as the initial temperature deviation.

[0017] If the initial temperature deviation is greater than the preset adjustment threshold and the initial temperature difference index is positive, then the first correction power is set to 0, and the heating power is adjusted to the first correction power to realize the first heating power adjustment. The first correction power is the heating power that needs to be adjusted to during the first heating power adjustment.

[0018] If the initial temperature deviation is greater than the preset adjustment threshold and the initial temperature difference index is non-positive, then the first correction power is determined based on the initial temperature deviation and the heating power detected at the start time of the preset first explosion stage, and the heating power is adjusted to the first correction power to achieve the first heating power adjustment;

[0019] If the initial temperature deviation is less than or equal to the preset adjustment threshold, the first correction power is determined based on the temperature collected at different preset locations at the start time of the preset first explosion stage, and the heating power is adjusted to the first correction power to achieve the first heating power adjustment.

[0020] In conjunction with the first aspect above, in one possible implementation, determining the first correction power based on the initial temperature deviation and the heating power detected at the preset start time of the first explosion stage includes:

[0021] The heating power detected at the start time of the preset first explosion stage is determined as the initial heating power;

[0022] The theoretical heating power of the heating element when the temperature inside the roasting oven reaches the first crack temperature of the coffee beans is determined as the target theoretical power.

[0023] The difference between the target theoretical power and the initial heating power is determined as the initial power deviation, and the product of the initial power deviation and the initial temperature deviation is determined as the initial power increment.

[0024] The sum of the initial heating power and the initial power increment is determined as the first correction power.

[0025] In conjunction with the first aspect above, in one possible implementation, determining the first correction power based on the temperatures collected at different preset locations at the start time of the preset first explosion stage includes:

[0026] The absolute value of the temperature difference between every two preset locations collected at the start time of the preset first explosion stage is determined as the location temperature difference, thus obtaining the set of location temperature differences at the start time of the preset first explosion stage.

[0027] The temperature distribution uniformity at the start of the preset first explosion stage is determined based on the maximum value in the set of location temperature differences at the start of the preset first explosion stage.

[0028] If the temperature distribution uniformity at the start of the first explosion stage is greater than the preset uniformity threshold, then the first correction power is set to the preset minimum power.

[0029] If the temperature distribution uniformity at the start of the preset first explosion stage is less than or equal to a preset uniformity threshold, then the first correction power is set to the heating power detected at the start of the preset first explosion stage.

[0030] In conjunction with the first aspect above, in one possible implementation, the second adaptive adjustment of the heating power based on the temperature change during a preset observation period under the first power adjustment includes:

[0031] Based on the absolute value of the temperature difference between different preset locations collected at the end of the preset observation period under the first power adjustment, the temperature distribution uniformity at the end of the preset observation period under the first power adjustment is determined and denoted as the marked distribution uniformity. There are three preset locations: the top, middle and bottom heating tubes of the baking oven.

[0032] The temperature at each preset location is collected at each moment during the preset observation period under the first power adjustment, and the temperature sequence of each preset location under the first power adjustment is obtained.

[0033] The rate of change of the top temperature is determined by the absolute value of the difference between the last temperature and the first temperature in the temperature sequence of the top of the baking oven under the first power adjustment.

[0034] The difference between the last temperature and the first temperature in the temperature sequence of the top of the baking oven under the first power adjustment is determined as the value of the direction of the top temperature change.

[0035] If the uniformity of the mark distribution is greater than the preset uniformity threshold and the top temperature change direction value is positive, then the second correction power is set to 0, and the heating power is adjusted to the second correction power to realize the second heating power adjustment. The second correction power is the heating power that needs to be adjusted to during the second heating power adjustment.

[0036] If the uniformity of the mark distribution is greater than a preset uniformity threshold, the top temperature change direction value is not positive, and the top temperature change rate is less than or equal to a preset change threshold, then the second correction power is set to 0, and the heating power is adjusted to the second correction power to achieve the second heating power adjustment.

[0037] If the uniformity of the mark distribution is greater than a preset uniformity threshold, and the top temperature change direction value is not positive, and the top temperature change rate is greater than a preset change threshold, then based on the heating power before and after the first power adjustment and the top temperature change rate, a second correction power is determined, and the heating power is adjusted to the second correction power to achieve the second heating power adjustment.

[0038] If the uniformity of the mark distribution is less than or equal to a preset uniformity threshold, the relative temperature deviation at the end of the preset observation period under the first power adjustment is determined, and the heating power is adjusted according to the relative temperature deviation at the end of the preset observation period under the first power adjustment to achieve the second heating power adjustment.

[0039] In conjunction with the first aspect above, in one possible implementation, determining the second correction power based on the heating power before and after the first power adjustment, and the rate of change of the top temperature, includes:

[0040] The difference in heating power before and after the first power adjustment is defined as the first power difference.

[0041] The ratio of the rate of change of the top temperature to the last temperature in the temperature sequence of the top of the baking oven under the first power adjustment is determined as the target weight;

[0042] The product of the first power difference and the target weight is determined as the target power increment factor;

[0043] The sum of the heating power after the first power adjustment and the target power increment factor is determined as the second corrected power.

[0044] In conjunction with the first aspect above, in one possible implementation, adjusting the heating power based on the relative temperature deviation at the end of the preset observation period under the first power adjustment includes:

[0045] The relative temperature deviation at the end of the preset observation period under the first power adjustment is determined as the marked temperature deviation, and the difference between the surface temperature of the bottom heating tube collected at the end of the preset observation period under the first power adjustment and the preset first explosion temperature is determined as the marked temperature difference index.

[0046] If the marked temperature deviation is greater than the preset adjustment threshold and the marked temperature difference index is positive, then the second correction power is set to 0, and the heating power is adjusted to the second correction power to achieve the second heating power adjustment;

[0047] If the marked temperature deviation is greater than the preset adjustment threshold and the marked temperature difference index is a non-positive number, then based on the marked temperature deviation and the heating power detected at the end of the preset observation period under the first power adjustment, the second correction power is determined, and the heating power is adjusted to the second correction power to achieve the second heating power adjustment;

[0048] If the marked temperature deviation is less than or equal to the preset adjustment threshold, then the second correction power is determined based on the temperature sequence of different preset positions under the first power adjustment, and the heating power is adjusted to the second correction power to achieve the second heating power adjustment.

[0049] In conjunction with the first aspect above, in one possible implementation, determining the second correction power based on the temperature sequence at different preset positions under the first power adjustment includes:

[0050] The difference between the second and the first temperature in the temperature sequence of each preset position under the first power adjustment is determined as the reference temperature difference, thus obtaining the reference temperature difference set of each preset position under the first power adjustment.

[0051] The mean of all reference temperature differences in the reference temperature difference set for each preset position under the first power adjustment is determined as the temperature trend characteristic value for each preset position under the first power adjustment.

[0052] If the temperature trend characteristic values ​​of all preset positions are positive under the first power adjustment, then the formula corresponding to the second correction power is determined based on the marked temperature deviation:

[0053] P2=P1×(1-a end );

[0054] Where P2 is the second correction power; P1 is the first correction power; a end It indicates the temperature deviation;

[0055] If the temperature trend characteristic values ​​of all preset positions are negative under the first power adjustment, then the formula corresponding to the second correction power is determined based on the marked temperature deviation:

[0056] P2=P1×(1+a end );

[0057] Where P2 is the second correction power; P1 is the first correction power; a end It indicates the temperature deviation;

[0058] If the temperature trend characteristic values ​​of all preset locations under the first power adjustment are neither all negative nor all positive, then the standard deviation of all temperatures in the temperature sequence of each preset location under the first power adjustment is determined as the target standard deviation for each preset location under the first power adjustment. Based on the target standard deviation and temperature trend characteristic values ​​of different preset locations under the first power adjustment, the formula corresponding to the similarity of temperature characteristics inside the chamber is determined as follows:

[0059] c = 1 - norm(c1 × c2);

[0060]

[0061] Where c represents the similarity of temperature characteristics within the chamber; norm() is the normalization function; c1 represents the similarity of temperature characteristics between different locations within the chamber; c2 represents the overall temperature fluctuation within the chamber; N is the number of preset locations; i and k are the indices of the different preset locations; || is the absolute value function; F i It is the temperature trend characteristic value of the i-th preset position under the first power adjustment; F k It is the temperature trend characteristic value of the k-th preset position under the first power adjustment; σ i σ is the target standard deviation of the i-th preset position under the first power adjustment; kIt is the target standard deviation of the k-th preset position under the first power adjustment;

[0062] If the similarity of temperature characteristics inside the chamber is greater than the preset similarity threshold, then the second correction power is set to the first correction power.

[0063] If the similarity of temperature characteristics inside the chamber is less than or equal to a preset similarity threshold, then the second correction power is set to the preset minimum power.

[0064] In a second aspect, the present invention provides an energy-saving coffee roasting device based on waste heat recycling, including a processor and a memory, wherein the processor is used to process instructions stored in the memory to implement the method in the first aspect or any possible implementation thereof.

[0065] Thirdly, a server is provided, including a memory and a processor. The memory is used to store executable program code, and the processor is used to call and run the executable program code from the memory, causing the device to perform the methods of the first aspect or any possible implementation thereof.

[0066] Fourthly, a computer program product is provided, comprising: computer program code, which, when run on a computer, causes the computer to perform the methods described in the first aspect or any possible implementation thereof.

[0067] Fifthly, a computer-readable storage medium is provided that stores computer program code, which, when executed on a computer, causes the computer to perform the methods described in the first aspect or any possible implementation thereof.

[0068] The present invention has the following beneficial effects:

[0069] The present invention provides a control method for an energy-saving coffee roasting equipment based on waste heat circulation. In addition to activating waste heat circulation during the cooling stage, the method also activates waste heat circulation during the preset first crack stage and adaptively adjusts the heating power at different times during the preset first crack stage, thereby achieving energy saving during the first crack stage and improving the overall energy-saving effect of the coffee roasting equipment. Attached Figure Description

[0070] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0071] Figure 1 This is a flowchart of the control method for the energy-saving coffee roasting equipment based on waste heat recycling according to the present invention;

[0072] Figure 2 This is a schematic diagram of the structure of a computer device according to the present invention. Detailed Implementation

[0073] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the specific implementation methods, structures, features, and effects of the technical solution proposed according to the present invention are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0075] refer to Figure 1 This document illustrates the flow chart of some embodiments of the control method for an energy-saving coffee roasting equipment based on waste heat recycling according to the present invention. The control method for this energy-saving coffee roasting equipment based on waste heat recycling includes the following steps:

[0076] Step S1: Based on the waste heat circulation being started during the cooling stage, waste heat circulation is also started during the preset first explosion stage. The relative temperature deviation at the start of the preset first explosion stage is determined based on the difference between the surface temperature of the bottom heating tube collected at the start time of the preset first explosion stage and the preset first explosion temperature.

[0077] The coffee roasting equipment, also known as a roasting oven, can include multiple roasting stages during the roasting process, such as a first crack stage, a second crack stage, and a cooling stage. The first crack stage is when the temperature inside the coffee roasting equipment reaches the first crack temperature but not the second crack temperature. The second crack stage is when the temperature inside the coffee roasting equipment reaches the second crack temperature, which is higher than the first crack temperature. The cooling stage is the cooling stage at the end of the roasting process. Energy-saving coffee roasting equipment based on waste heat circulation can be coffee roasting equipment that achieves energy saving by utilizing waste heat circulation. For example, energy-saving coffee roasting equipment based on waste heat circulation can be a cocoa bean energy-saving roasting device with multi-layer waste heat circulation as described in application number 202123331716.4, which achieves energy saving through waste heat circulation. This invention embodiment not only activates waste heat circulation during the cooling stage at the end of the roasting process, but also activates it during the first crack stage. The preset first crack stage can be the stage where the coffee roasting equipment maintains residual heat after the first crack during the roasting process, i.e., the first crack stage. The bottom heating element can be a heating element located at the bottom of the coffee roasting equipment. The surface temperature of the bottom heating element can be the temperature of the upper surface of the heating element at the bottom of the coffee roasting equipment. The preset first burst temperature can be a pre-set first burst temperature, which can be equal to 170 degrees Celsius.

[0078] It's important to note that the first and second cracks are stages in the coffee roasting process. The first crack occurs first, followed by the second. The first crack occurs at a lower temperature, while the second crack occurs at a higher temperature. Typically, the first crack temperature is around 170 degrees Celsius, and the second crack temperature is around 220 degrees Celsius. During the first crack, the temperature cannot be too high or too low—it cannot fall below the first crack temperature or rise above the second crack temperature—otherwise, the first crack stage often cannot be sustained; or the coffee beans in the roasting chamber may not be able to reach the same state, for example, some coffee beans may not have reached the first crack stage while others have already reached the second crack temperature, thus affecting the roasting quality. Therefore, strict temperature control is required during the first crack roasting process to ensure that all coffee beans reach the first crack stage but do not proceed to the second crack stage. During the first crack, to ensure that there is no significant difference in the stages of coffee bean development within the chamber and that the cracking points of coffee beans in all locations are synchronized, residual heat circulation can be used to maintain the roasting temperature. During this process, the heating power of the heating elements can be adjusted to avoid overheating and achieve energy savings.

[0079] As an example, this step may include the following steps:

[0080] The first step is to determine the absolute value of the difference between the surface temperature of the bottom heating tube collected at the beginning of the preset first explosion stage and the preset first explosion temperature as the temperature difference factor at the beginning of the preset first explosion stage.

[0081] The second step is to determine the difference between the preset second explosion temperature and the preset first explosion temperature as the stage temperature difference factor.

[0082] The preset second explosion temperature can be a pre-set second explosion temperature, which can be 220 degrees Celsius.

[0083] The third step is to determine the relative temperature deviation at the start of the preset first explosion stage based on the ratio of the temperature difference factor at the start of the preset first explosion stage to the temperature difference factor of the above-mentioned stages.

[0084] For example, the formula for determining the relative temperature deviation at the preset start time of the first explosion stage can be:

[0085]

[0086] Where a0 is the relative temperature deviation at the preset start time of the first explosion stage. || is the absolute value function. T10 is the surface temperature of the bottom heating tube collected at the preset start time of the first explosion stage. T1 is the preset first explosion temperature. T2 is the preset second explosion temperature. |T10-T1| is the temperature difference factor at the preset start time of the first explosion stage. T2-T1 is the stage temperature difference factor.

[0087] It should be noted that when a0 is larger, it often indicates that the surface temperature of the bottom heating tube deviates more from the first explosion temperature at the beginning of the preset first explosion stage, which often means that temperature adjustment is more necessary.

[0088] Step S2: Based on the relative temperature deviation at the start time of the preset first explosion stage, the heating power is adaptively adjusted for the first time.

[0089] It should be noted that the moment when the heating power is first adaptively adjusted can be the moment after the preset start time of the first explosion stage.

[0090] As an example, this step may include the following steps:

[0091] The first step is to determine the difference between the surface temperature of the bottom heating tube collected at the start time of the preset first explosion stage and the preset first explosion temperature as the initial temperature difference index, and to determine the relative temperature deviation at the start time of the preset first explosion stage as the initial temperature deviation.

[0092] The second step is to set the first correction power to 0 and adjust the heating power to the first correction power if the initial temperature deviation is greater than the preset adjustment threshold and the initial temperature difference index is positive. This achieves the first heating power adjustment.

[0093] The preset adjustment threshold can be a pre-set threshold, which can be equal to 2%. The first correction power can be the heating power that needs to be adjusted to during the first heating power adjustment.

[0094] It should be noted that if the initial temperature deviation is greater than the preset adjustment threshold and the initial temperature difference is positive, it often indicates that the baking temperature is too high. In this case, the heating element should be stopped, and the stirring shaft speed should be increased to ensure uniform temperature within the oven. Setting the heating power to 0 means turning off the heating element.

[0095] The third step is to determine the first correction power based on the initial temperature deviation and the heating power detected at the beginning of the first explosion stage, and adjust the heating power to the first correction power to achieve the first heating power adjustment.

[0096] It should be noted that when the initial temperature deviation is greater than the preset adjustment threshold and the initial temperature difference index is not positive, it often indicates that the temperature is seriously low. Relying solely on residual heat circulation is often insufficient to maintain the current temperature, and it is often necessary to increase the heating power of the current heating element to raise the baking temperature inside the baking oven.

[0097] For example, determining the first correction power based on the aforementioned initial temperature deviation and the heating power detected at the preset start time of the first explosion stage may include the following sub-steps:

[0098] The first sub-step involves determining the heating power detected at the start time of the preset first explosion stage as the initial heating power.

[0099] The second sub-step is to determine the theoretical heating power of the heating element when the temperature inside the roasting oven reaches the first crack temperature of the coffee beans, as the target theoretical power.

[0100] Among them, roasting equipment is coffee roasting equipment.

[0101] It should be noted that the target theoretical power is often the heating power of the heating element that is preset at the factory to reach the first crack temperature of the coffee beans.

[0102] The third sub-step is to determine the difference between the target theoretical power and the initial heating power as the initial power deviation, and to determine the product of the initial power deviation and the initial temperature deviation as the initial power increment.

[0103] The fourth sub-step is to determine the sum of the initial heating power and the initial power increment as the first correction power.

[0104] For example, based on the initial temperature deviation and the heating power detected at the start time of the preset first explosion stage, the formula for determining the first correction power can be:

[0105] P1 = P0 + a0 × (P - P0);

[0106] Where P1 is the first corrected power. P0 is the heating power detected at the preset start time of the first crack stage, i.e., the initial heating power. a0×(P-P0) is the initial power increment. P-P0 is the initial power deviation. a0 is the relative temperature deviation at the preset start time of the first crack stage, i.e., the initial temperature deviation. P is the theoretical heating power of the heating element when the temperature inside the roasting oven reaches the first crack temperature of the coffee beans, i.e., the target theoretical power.

[0107] It should be noted that since the theoretical power only considers the effect of the heat provided by the heating element on the chamber temperature, but there is residual heat circulation during the first explosion stage to achieve heat recycling, the actual heating power required is often less than the theoretical power. P1 can represent the actual heating power required.

[0108] Fourth step: If the initial temperature deviation is less than or equal to the preset adjustment threshold, then the first correction power is determined based on the temperature at different preset locations collected at the start time of the preset first explosion stage, and the heating power is adjusted to the first correction power to achieve the first heating power adjustment.

[0109] The preset position can be a pre-set location. For example, there can be three preset positions, which can be: the top of the coffee roasting equipment, the middle of the coffee roasting equipment, and the upper surface of the heating tube at the bottom of the coffee roasting equipment.

[0110] It should be noted that when the initial temperature deviation is less than or equal to the preset adjustment threshold, further judgment is needed on whether to stop the operation of the heating element, so as to minimize the situation where the heating element needs to be restarted during the waste heat circulation stage after it has been stopped.

[0111] For example, determining the first correction power based on the temperature collected at different preset locations at the start time of the preset first explosion stage may include the following sub-steps:

[0112] The first sub-step involves determining the absolute value of the temperature difference between every two preset locations collected at the start time of the preset first explosion stage as the location temperature difference, thus obtaining the set of location temperature differences at the start time of the preset first explosion stage.

[0113] The second sub-step is to determine the temperature distribution uniformity at the start of the preset first explosion stage based on the maximum value in the set of location temperature differences at the start of the preset first explosion stage.

[0114] For example, the formula for determining the uniformity of temperature distribution at the preset start time of the first explosion stage can be:

[0115]

[0116] Where b0 represents the temperature distribution uniformity at the preset start time of the first explosion stage. ΔT0 is the maximum value in the set of location temperature differences at the preset start time of the first explosion stage, which is the maximum absolute value of the temperature difference between different preset locations collected at the preset start time of the first explosion stage. T1 is the preset first explosion temperature.

[0117] It should be noted that a larger b0 value generally indicates a higher consistency in temperature across different preset locations at the start of the preset first crack stage; this also generally indicates a more uniform temperature distribution within the coffee roasting equipment. A more uniform temperature distribution means that the temperature at the bottom is more representative of the actual roasting temperature within the entire coffee roasting equipment, providing better conditions for residual heat circulation and allowing the heating element to be turned off.

[0118] In the third sub-step, if the temperature distribution uniformity at the start of the first explosion stage is greater than the preset uniformity threshold, then the first correction power is set to the preset minimum power, and the heating tube is not turned off.

[0119] The preset uniformity threshold can be a pre-set threshold, which can be 0.95. The preset minimum power can be the lowest non-zero heating power when the heating element is working.

[0120] The fourth sub-step is to set the first correction power to the heating power detected at the start time of the first explosion stage if the temperature distribution uniformity at the preset start time of the first explosion stage is less than or equal to the preset uniformity threshold.

[0121] It should be noted that if the temperature distribution uniformity at the start of the first crack stage is less than or equal to the preset uniformity threshold, the temperature distribution uniformity is considered insufficient. There is a large temperature difference between different parts of the coffee roasting equipment, and the roasting temperature of coffee beans in different locations varies greatly, which seriously affects the roasting quality of coffee beans. At this time, the motor power is increased to increase the speed of the stirring shaft, so that the temperature of each layer in the chamber tends to be uniform, which can improve the roasting quality and maintain the current heating power of the heating tube, that is, the heating tube is not adjusted.

[0122] Step S3: Based on the moment when the heating power is first adaptively adjusted, construct a preset observation period under the first power adjustment.

[0123] It should be noted that the start time of the preset observation period under the first power adjustment can be the moment immediately following the moment when the heating power is first adaptively adjusted. The duration of the preset observation period under the first power adjustment can be preset, and can be 2 minutes.

[0124] Step S4: Based on the temperature changes during the preset observation period under the first power adjustment, the heating power is adaptively adjusted a second time.

[0125] It should be noted that the second adaptive adjustment of the heating power can be made at the moment following the end of the preset observation period under the first power adjustment.

[0126] As an example, this step may include the following steps:

[0127] The first step is to determine the temperature distribution uniformity at the end of the preset observation period under the first power adjustment based on the absolute value of the temperature difference between different preset locations collected at the end of the preset observation period under the first power adjustment. This uniformity is denoted as the marked distribution uniformity. There are three preset locations: the top, middle, and bottom heating tubes of the baking oven.

[0128] It should be noted that the method for obtaining the temperature distribution uniformity at the end of the preset observation period under the first power adjustment can be the same as the method for obtaining the temperature distribution uniformity at the beginning of the preset first explosion stage, and will not be repeated here.

[0129] The second step involves collecting the temperature at each preset location at each moment during the preset observation period under the first power adjustment, thus obtaining the temperature sequence of each preset location under the first power adjustment.

[0130] The third step is to determine the rate of change of the top temperature based on the absolute value of the difference between the last temperature and the first temperature in the temperature sequence of the top of the baking oven under the first power adjustment.

[0131] The last temperature in the temperature sequence at the top of the baking oven under the first power adjustment can be the temperature at the end of the preset observation period under the first power adjustment. The first temperature in the temperature sequence at the top of the baking oven under the first power adjustment can be the temperature at the start of the preset observation period under the first power adjustment.

[0132] For example, the formula for determining the rate of temperature change at the top can be:

[0133]

[0134] Where δT1 is the rate of change of the top temperature. || is the absolute value function. T end It is the last temperature in the temperature sequence at the top of the baking oven under the first power adjustment. begin It is the first temperature in the temperature sequence of the top of the baking oven under the first power adjustment.

[0135] The fourth step is to determine the difference between the last temperature and the first temperature in the temperature sequence of the top of the baking oven under the first power adjustment as the value of the direction of the top temperature change.

[0136] Fifth step: If the uniformity of the above-mentioned mark distribution is greater than the preset uniformity threshold and the temperature change direction value at the top is positive, then set the second correction power to 0 and adjust the heating power to the second correction power to achieve the second heating power adjustment.

[0137] The second correction power can be the heating power that needs to be adjusted to during the second heating power adjustment.

[0138] It should be noted that when the uniformity of the marking distribution is greater than the preset uniformity threshold and the temperature change direction value at the top is positive, it often indicates that the temperature distribution is uniform and there is a temperature rise. This often means that maintaining a lower heating power of the heating tube can also ensure that the temperature of the roasting chamber is maintained at a higher level. In this case, it means that the roasting temperature can often be maintained until the coffee beans in the roasting chamber complete the first crack stage by relying solely on residual heat circulation. In this situation, the heating tube can often be turned off.

[0139] Step 6: If the uniformity of the above-mentioned mark distribution is greater than the preset uniformity threshold, the top temperature change direction value is not positive, and the top temperature change rate is less than or equal to the preset change threshold, then the second correction power is set to 0, and the heating power is adjusted to the second correction power to achieve the second heating power adjustment.

[0140] It should be noted that when the uniformity of the above-mentioned markings is greater than the preset uniformity threshold, the direction of the temperature change at the top is not positive, and the rate of temperature change at the top is less than or equal to the preset change threshold, it often indicates that the temperature distribution is uniform and the temperature drop is small. This often indicates that maintaining a lower heating power of the heating tube can also ensure that the temperature of the roasting chamber remains high. In this case, it means that the roasting temperature can often be maintained until the coffee beans in the roasting chamber complete the first crack stage based solely on residual heat circulation. In this situation, the heating tube can often be turned off.

[0141] Step 7: If the uniformity of the above-mentioned mark distribution is greater than the preset uniformity threshold, and the top temperature change direction value is not positive, and the top temperature change rate is greater than the preset change threshold, then the second correction power is determined based on the heating power before and after the first power adjustment and the top temperature change rate, and the heating power is adjusted to the second correction power to achieve the second heating power adjustment.

[0142] It should be noted that if the rate of temperature change at the top decreases beyond the threshold, it often indicates that the temperature inside the roasting chamber drops rapidly after reducing the heating power of the heating element. In this case, relying solely on low-power heating and residual heat circulation is often insufficient to ensure that the temperature inside the roasting chamber is sufficient to roast the coffee beans. Therefore, the heating power of the heating element should usually be increased.

[0143] For example, determining the second corrected power based on the heating power before and after the first power adjustment, and the rate of change of the top temperature, may include the following sub-steps:

[0144] The first sub-step is to determine the difference in heating power before and after the first power adjustment as the first power difference.

[0145] The second sub-step is to determine the target weight as the ratio of the aforementioned top temperature change rate to the last temperature in the temperature sequence of the top of the baking oven under the first power adjustment.

[0146] The third sub-step involves multiplying the aforementioned first power difference by the aforementioned target weight to determine the target power increment factor.

[0147] The fourth sub-step involves determining the second corrected power as the sum of the heating power after the first power adjustment and the aforementioned target power increment factor.

[0148] For example, based on the heating power before and after the first power adjustment, and the rate of change of the top temperature, the formula for determining the second corrected power can be:

[0149]

[0150] Where P2 is the second corrected power. P1 is the first corrected power, which is the heating power after the first power adjustment. P0 is the heating power detected at the preset start time of the first explosion stage, which is the heating power before the first power adjustment. δT1 is the rate of change of the top temperature. T end This is the last temperature in the temperature sequence at the top of the baking oven under the first power adjustment. P0-P1 is the first power difference. It is the target weight. It is the target power increment factor.

[0151] Step 8: If the uniformity of the above-mentioned mark distribution is less than or equal to the preset uniformity threshold, determine the relative temperature deviation at the end of the preset observation period under the first power adjustment, and adjust the heating power according to the relative temperature deviation at the end of the preset observation period under the first power adjustment to achieve the second heating power adjustment.

[0152] For example, adjusting the heating power based on the relative temperature deviation at the end of the preset observation period under the first power adjustment may include the following sub-steps:

[0153] The first sub-step is to determine the relative temperature deviation at the end of the preset observation period under the first power adjustment as the marked temperature deviation, and to determine the difference between the surface temperature of the bottom heating tube collected at the end of the preset observation period under the first power adjustment and the preset first explosion temperature as the marked temperature difference index.

[0154] In the second sub-step, if the marked temperature deviation is greater than the preset adjustment threshold and the marked temperature difference index is positive, then the second correction power is set to 0, and the heating power is adjusted to the second correction power to achieve the second heating power adjustment.

[0155] In the third sub-step, if the marked temperature deviation is greater than the preset adjustment threshold and the marked temperature difference index is a non-positive number, then based on the marked temperature deviation and the heating power detected at the end of the preset observation period under the first power adjustment, the second correction power is determined, and the heating power is adjusted to the second correction power to achieve the second heating power adjustment. The method for obtaining the second correction power in this sub-step can be the same as the method for obtaining the first correction power in the third step of step S2, and will not be repeated here.

[0156] In the fourth sub-step, if the marked temperature deviation is less than or equal to the preset adjustment threshold, the second correction power is determined based on the temperature sequence of different preset positions under the first power adjustment, and the heating power is adjusted to the second correction power to achieve the second heating power adjustment.

[0157] For example, determining the second corrected power based on the temperature sequence at different preset positions under the first power adjustment may include the following steps:

[0158] First, the difference between the next temperature and the previous temperature in the temperature sequence of each preset position under the first power adjustment is determined as the reference temperature difference, thus obtaining the reference temperature difference set for each preset position under the first power adjustment.

[0159] For example, the formula for determining the reference temperature difference in the reference temperature difference set for the preset position under the first power adjustment can be:

[0160] fi,j =T i,j+1 -T i,j ;

[0161] Among them, f i,j It is the j-th reference temperature difference in the set of reference temperature differences for the i-th preset position under the first power adjustment. i is the index of the preset position. j is the index of the reference temperature difference in the set of reference temperature differences. T i,j+1 It is the (j+1)th temperature in the temperature sequence of the i-th preset position under the first power adjustment. i,j It is the j-th temperature in the temperature sequence of the i-th preset position under the first power adjustment.

[0162] Next, the mean value of all reference temperature differences in the reference temperature difference set for each preset position under the first power adjustment is determined as the temperature trend characteristic value for each preset position under the first power adjustment.

[0163] Then, if the temperature trend characteristic values ​​of all preset positions are positive under the first power adjustment, the formula corresponding to the second correction power is determined based on the marked temperature deviation:

[0164] P2=P1×(1-a end );

[0165] Where P2 is the second correction power; P1 is the first correction power; a end It indicates the temperature deviation.

[0166] It should be noted that if the temperature trend characteristic values ​​of all preset positions are positive under the first power adjustment, it indicates that the temperature inside the baking oven has increased before and after the observation stage. However, the overall temperature change is not significant at this time. Therefore, the heating element cannot be turned off directly or adjusted to the lowest power. Instead, the heating power of the heating element can be fine-tuned.

[0167] Secondly, if the temperature trend characteristic values ​​of all preset positions are negative under the first power adjustment, then the formula corresponding to the second correction power is determined based on the marked temperature deviation:

[0168] P2=P1×(1+a end );

[0169] Where P2 is the second correction power; P1 is the first correction power; a end It indicates the temperature deviation.

[0170] Continuing, if the temperature trend characteristic values ​​of all preset locations under the first power adjustment are neither all negative nor all positive, then the standard deviation of all temperatures in the temperature sequence of each preset location under the first power adjustment is determined as the target standard deviation for each preset location under the first power adjustment. Based on the target standard deviation and temperature trend characteristic values ​​of different preset locations under the first power adjustment, the formula corresponding to the similarity of temperature characteristics inside the chamber is determined as follows:

[0171] c = 1 - norm(c1 × c2);

[0172]

[0173] Where c represents the similarity of temperature characteristics within the chamber; norm() is the normalization function; c1 represents the similarity of temperature characteristics between different locations within the chamber; c2 represents the overall temperature fluctuation within the chamber; N is the number of preset locations; i and k are the indices of the different preset locations; || is the absolute value function; F i It is the temperature trend characteristic value of the i-th preset position under the first power adjustment; F k It is the temperature trend characteristic value of the k-th preset position under the first power adjustment; σ i σ is the target standard deviation of the i-th preset position under the first power adjustment; k It is the target standard deviation of the k-th preset position under the first power adjustment.

[0174] It should be noted that the larger the value of 'c', the higher the temperature stability within the coffee roasting equipment.

[0175] Furthermore, if the similarity of temperature characteristics inside the chamber is greater than the preset similarity threshold, the second correction power is set to the first correction power.

[0176] The preset similarity threshold can be a pre-set threshold, which can be 0.95.

[0177] It should be noted that if the temperature characteristics within the roasting chamber are highly similar, then the combined effect of the heat provided by the heating element and the residual heat circulation is necessary to ensure sufficient heat for the first crack process within the roasting chamber. Turning off the heating element or adjusting its power at this point would disrupt the stable temperature within the chamber, thus affecting the roasting quality of the coffee beans. Therefore, it is advisable not to adjust the heating element power in this situation.

[0178] Finally, if the temperature characteristic similarity inside the chamber is less than or equal to the preset similarity threshold, the second correction power is set to the preset minimum power.

[0179] Step S5, similarly, for each heating power adjustment after the second heating power adjustment within the preset first explosion stage, includes: adaptively adjusting the heating power based on the temperature change within the preset observation period under the previous power adjustment.

[0180] It should be noted that the method for adaptively adjusting the heating power after the second adjustment can be the same as the method for the second adjustment. For example, the method for adaptively adjusting the heating power for the third adjustment can be the same as the method for the second adjustment, and will not be elaborated further here.

[0181] Optionally, after multiple adaptive adjustments to the heating power, if these adjustments do not result in a change in the heating power, a linear fit is performed on the similarity of the temperature characteristics within the chamber during these multiple adaptive adjustments. The horizontal axis represents time, and the vertical axis represents the similarity of the temperature characteristics within the chamber. If the slope of the fitted line is non-negative, it often indicates that although the power of the heating element was not adjusted during these observation stages, the temperature of the roasting chamber gradually stabilized. This suggests that the current heating temperature of the heating element often meets the first burst temperature requirement during roasting. In this case, the power of the heating element is not adjusted. If the slope of the fitted line is negative, it often indicates that over time, severe temperature stratification and a stratification trend may have occurred at different locations, and this trend is becoming increasingly severe. In this case, it is often impossible to achieve consistent roasting temperatures, and it is often considered that a temperature anomaly has occurred. Stirring alone is often insufficient to achieve consistent roasting temperatures. In this case, the heating element can be turned off to prevent the coffee beans at the bottom from burning, and moisture can be added to the container to ensure sufficient airflow for residual heat circulation.

[0182] Optionally, waste heat circulation can be started in the preset second explosion stage to achieve energy saving in the preset second explosion stage. The method for adjusting the heating power in the preset second explosion stage can refer to the method for adjusting the heating power in the preset first explosion stage, and will not be repeated here.

[0183] Based on the same inventive concept as the above-described method embodiments, the present invention provides an energy-saving coffee roasting device based on waste heat recycling, including a processor and a memory. The processor is used to process instructions stored in the memory to implement the above-described control method for an energy-saving coffee roasting device based on waste heat recycling.

[0184] Figure 2 This is a schematic diagram of the structure of a computer device provided in an embodiment of the present invention. For example, as shown... Figure 2As shown, the computer device 200 includes: a memory 201, a processor 202, and a computer program 203 stored in the memory 201 and running on the processor 202, wherein when the processor 202 executes the computer program 203, the computer device can execute any of the control methods of the energy-saving coffee roasting equipment based on waste heat circulation described above.

[0185] Based on the same inventive concept as the above-described method embodiments, the present invention provides a server, including a memory and a processor. The memory stores executable program code, and the processor retrieves and runs the executable program code from the memory, causing the device to execute any of the above-described control methods for energy-saving coffee roasting equipment based on waste heat recycling.

[0186] Based on the same inventive concept as the above-described method embodiments, the present invention provides a computer program product comprising: computer program code, which, when executed on a computer, causes the computer to perform any of the above-described control methods for energy-saving coffee roasting equipment based on waste heat circulation.

[0187] Based on the same inventive concept as the above-described method embodiments, the present invention provides a computer-readable storage medium storing computer program code, which, when executed on a computer, causes the computer to perform any of the above-described control methods for energy-saving coffee roasting equipment based on waste heat recycling.

[0188] In summary, by initiating waste heat circulation during the cooling phase and also during the preset first crack phase, and by adaptively adjusting the heating power at different times during the preset first crack phase, energy saving is achieved during the first crack phase, thereby improving the overall energy-saving effect of the coffee roasting equipment.

[0189] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method of regulating an energy-saving coffee roasting apparatus based on a residual heat cycle, characterized by, The method comprises the following steps: On the basis of starting the waste heat cycle in the cooling stage, the waste heat cycle is also started in the preset first explosion stage, and a relative temperature deviation at the starting moment of the preset first explosion stage is determined according to the difference between the surface temperature of the bottom heating tube collected at the starting moment of the preset first explosion stage and the preset first explosion temperature; The heating power is adaptively adjusted for the first time according to the relative temperature deviation at the starting moment of the preset first explosion stage; A preset observation time period under the first power adjustment is constructed based on the time of adaptively adjusting the heating power for the first time; The heating power is adaptively adjusted for the second time according to the temperature change in the preset observation time period under the first power adjustment; For each heating power adjustment after the second heating power adjustment in the preset first explosion stage, the heating power is adaptively adjusted according to the temperature change in the preset observation time period under the previous power adjustment; The heating power is adaptively adjusted for the first time according to the relative temperature deviation at the starting moment of the preset first explosion stage, comprising: the difference between the surface temperature of the bottom heating tube collected at the starting moment of the preset first explosion stage and the preset first explosion temperature is determined as an initial temperature difference index, and the relative temperature deviation at the starting moment of the preset first explosion stage is determined as an initial temperature deviation; if the initial temperature deviation is greater than a preset adjustment threshold and the initial temperature difference index is a positive number, a first correction power is set to 0, and the heating power is adjusted to the first correction power to realize the first heating power adjustment, wherein the first correction power is the heating power to be adjusted to in the first heating power adjustment; if the initial temperature deviation is greater than the preset adjustment threshold and the initial temperature difference index is a non-positive number, the first correction power is determined according to the initial temperature deviation and the heating power detected at the starting moment of the preset first explosion stage, and the heating power is adjusted to the first correction power to realize the first heating power adjustment; if the initial temperature deviation is less than or equal to the preset adjustment threshold, the first correction power is determined according to the temperature at different preset positions collected at the starting moment of the preset first explosion stage, and the heating power is adjusted to the first correction power to realize the first heating power adjustment.

2. The method of claim 1, wherein the method is characterized by, The relative temperature deviation at the starting moment of the preset first explosion stage is determined according to the difference between the surface temperature of the bottom heating tube collected at the starting moment of the preset first explosion stage and the preset first explosion temperature, comprising: The absolute value of the difference between the surface temperature of the bottom heating tube collected at the starting moment of the preset first explosion stage and the preset first explosion temperature is determined as a temperature difference factor at the starting moment of the preset first explosion stage; The difference between the preset second explosion temperature and the preset first explosion temperature is determined as a stage temperature difference factor; The relative temperature deviation at the starting moment of the preset first explosion stage is determined according to the ratio of the temperature difference factor at the starting moment of the preset first explosion stage to the stage temperature difference factor.

3. The method of claim 1, wherein the method is characterized by, The first correction power is determined according to the initial temperature deviation and the heating power detected at the starting moment of the preset first explosion stage, comprising: The heating power detected at the start time of the preset first explosive stage is determined as an initial heating power; The theoretical heating power of the heating pipe when the temperature in the roasting box device reaches the first explosive temperature of the coffee beans is determined as a target theoretical power; The difference between the target theoretical power and the initial heating power is determined as an initial power deviation, and the product of the initial power deviation and the initial temperature deviation is determined as an initial power increment; The sum of the initial heating power and the initial power increment is determined as a first corrected power.

4. The method of claim 1, wherein the method is characterized by, The first corrected power is determined according to the temperatures collected at different preset positions at the start time of the preset first explosive stage, including: The absolute value of the difference between the temperatures collected at each two preset positions at the start time of the preset first explosive stage is determined as a position temperature difference, to obtain a position temperature difference set at the start time of the preset first explosive stage; The temperature distribution uniformity at the start time of the preset first explosive stage is determined according to the maximum value in the position temperature difference set at the start time of the preset first explosive stage; If the temperature distribution uniformity at the start time of the preset first explosive stage is greater than a preset uniformity threshold, the first corrected power is set as a preset minimum power; If the temperature distribution uniformity at the start time of the preset first explosive stage is less than or equal to the preset uniformity threshold, the first corrected power is set as the heating power detected at the start time of the preset first explosive stage.

5. The method of claim 4, wherein the method further comprises: The second adaptive adjustment of the heating power is performed according to the temperature change in a preset observation period after the first power adjustment, including: The temperature distribution uniformity at the end time of the preset observation period after the first power adjustment is determined according to the absolute value of the difference between the temperatures collected at different preset positions at the end time of the preset observation period after the first power adjustment, and is denoted as a marked distribution uniformity, wherein the preset positions are three, which are the top, middle and bottom heating pipes of the roasting box; The temperature at each preset position is collected at each time in the preset observation period after the first power adjustment, to obtain a temperature sequence of each preset position after the first power adjustment; The top temperature change rate is determined according to the absolute value of the difference between the last temperature and the first temperature in the temperature sequence of the top after the first power adjustment; The top temperature change direction value is determined according to the difference between the last temperature and the first temperature in the temperature sequence of the top after the first power adjustment; If the marked distribution uniformity is greater than the preset uniformity threshold, and the top temperature change direction value is positive, the second corrected power is set as 0, and the heating power is adjusted to the second corrected power to realize the second heating power adjustment, wherein the second corrected power is the heating power to be adjusted in the second heating power adjustment. If the mark distribution uniformity is greater than the preset uniformity threshold, the top temperature change direction value is a non-positive number, and the top temperature change rate is less than or equal to the preset change threshold, the second correction power is set to 0, and the heating power is adjusted to the second correction power to realize the second heating power adjustment; If the mark distribution uniformity is greater than the preset uniformity threshold, and the top temperature change direction value is a non-positive number, and the top temperature change rate is greater than the preset change threshold, the second correction power is determined according to the heating power before and after the first power adjustment and the top temperature change rate, and the heating power is adjusted to the second correction power to realize the second heating power adjustment; If the mark distribution uniformity is less than or equal to the preset uniformity threshold, the relative temperature deviation at the end time of the preset observation period under the first power adjustment is determined, and the heating power is adjusted according to the relative temperature deviation at the end time of the preset observation period under the first power adjustment to realize the second heating power adjustment.

6. The method of claim 5, wherein the method further comprises: The second correction power is determined according to the heating power before and after the first power adjustment and the top temperature change rate, including: The difference between the heating power before and after the first power adjustment is determined as a first power difference; The ratio of the top temperature change rate to the last temperature in the temperature sequence of the top of the baking oven under the first power adjustment is determined as a target weight; The product of the first power difference and the target weight is determined as a target power increment factor; The sum of the heating power after the first power adjustment and the target power increment factor is determined as the second correction power.

7. The method of claim 5, wherein the method further comprises: determining a temperature of the coffee beans; and adjusting the temperature of the coffee beans based on the determined temperature of the coffee beans. The heating power is adjusted according to the relative temperature deviation at the end time of the preset observation period under the first power adjustment, including: The relative temperature deviation at the end time of the preset observation period under the first power adjustment is determined as a mark temperature deviation, and the difference between the surface temperature of the bottom heating tube collected at the end time of the preset observation period under the first power adjustment and a preset first explosion temperature is determined as a mark temperature difference index; If the mark temperature deviation is greater than a preset adjustment threshold, and the mark temperature difference index is a positive number, the second correction power is set to 0, and the heating power is adjusted to the second correction power to realize the second heating power adjustment; If the mark temperature deviation is greater than the preset adjustment threshold, and the mark temperature difference index is a non-positive number, the second correction power is determined according to the mark temperature deviation and the heating power detected at the end time of the preset observation period under the first power adjustment, and the heating power is adjusted to the second correction power to realize the second heating power adjustment; If the mark temperature deviation is less than or equal to the preset adjustment threshold, the second correction power is determined according to the temperature sequence of different preset positions under the first power adjustment, and the heating power is adjusted to the second correction power to realize the second heating power adjustment.

8. The method of claim 7, wherein the method further comprises: The second correction power is determined according to the temperature sequence of different preset positions under the first power adjustment, including: A difference between a later temperature and an earlier temperature of every two adjacent temperatures in the temperature sequence of each preset position under the first power adjustment is determined as a reference temperature difference, to obtain a reference temperature difference set of each preset position under the first power adjustment; An average of all reference temperature differences in the reference temperature difference set of each preset position under the first power adjustment is determined as a temperature trend characteristic value of each preset position under the first power adjustment; If the temperature trend characteristic values of all preset positions under the first power adjustment are positive, a formula corresponding to the second correction power is determined according to the marked temperature deviation as: ； wherein, is a second modified power; is a first modified power; is a flag temperature deviation; If the temperature trend characteristic values of all preset positions under the first power adjustment are negative, a formula corresponding to the second correction power is determined according to the marked temperature deviation as: ； wherein, is a second modified power; is a first modified power; is a flag temperature deviation; If the temperature trend characteristic values of all preset positions under the first power adjustment are neither all negative nor all positive, a standard deviation of all temperatures in the temperature sequence of each preset position under the first power adjustment is determined as a target standard deviation of each preset position under the first power adjustment; a formula corresponding to the temperature characteristic similarity in the box is determined according to the target standard deviation and the temperature trend characteristic value of different preset positions under the first power adjustment as: ； ； ； wherein c is a temperature characteristic similarity in the cabinet; is a normalization function; characterizes a temperature characteristic similarity between different positions in the cabinet; characterizes an overall temperature fluctuation in the cabinet; N is the number of preset positions; i and k are the serial numbers of different preset positions; is an absolute value function; is a temperature trend characteristic value of the i-th preset position under the first power adjustment; is a temperature trend characteristic value of the k-th preset position under the first power adjustment; is a target standard deviation of the i-th preset position under the first power adjustment; is a target standard deviation of the k-th preset position under the first power adjustment; If the temperature characteristic similarity in the box is greater than a preset similarity threshold, the second correction power is set as the first correction power; If the temperature characteristic similarity in the box is less than or equal to the preset similarity threshold, the second correction power is set as a preset minimum power.

9. An energy saving coffee roasting apparatus based on residual heat cycle, characterized in that, A processor and a memory are included, the processor is used to process instructions stored in the memory to realize the regulation method of the energy-saving coffee roasting device based on the waste heat cycle in any one of claims 1-8.

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