Energy-saving coffee baking equipment based on waste heat circulation and regulation and control method thereof

Abstract

The invention relates to the technical field of energy-saving electric appliances, in particular to energy-saving coffee baking equipment based on waste heat circulation and a regulation and control method thereof.The method comprises the steps that on the basis that waste heat circulation is started in a cooling stage, waste heat circulation is also started in a preset first explosion stage; according to the difference between the surface temperature, collected at the starting moment of the preset first explosion stage, of the bottom heating pipe and the preset first explosion temperature, the relative temperature deviation at the starting moment of the preset first explosion stage is determined, and therefore self-adaptive adjustment is conducted on the heating power for the first time; performing self-adaptive adjustment on the heating power for the second time according to the temperature change condition in the preset observation time period under the power adjustment for the first time; similarly, each heating power adjustment after the second heating power adjustment is realized. According to the invention, the rationality of adjusting the heating power in the first explosion stage is improved, so that energy saving in the first explosion stage is realized, and the overall energy-saving effect of the coffee baking equipment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy-saving electrical appliances, and in particular to energy-saving coffee roasting equipment based on waste heat circulation and a control method thereof. Background Art

[0002] The coffee roasting process often requires a large amount of heat, which is often directly dissipated into the air, resulting in energy waste. Some coffee roasting equipment has an internal waste heat circulation system. By recycling the hot air flow, the coffee beans are evenly heated, and the heat source provides additional heat, achieving energy savings and stabilizing the roasting temperature, while also improving the roasted coffee bean quality.

[0003] Currently, energy conservation efforts for coffee roasting equipment typically utilize waste heat recycling during the cooling phase near the end of roasting, as the cooling phase requires minimal temperature control. However, since the roasting process includes more than just the cooling phase, including other roasting stages, such as the first crack, recycling waste heat only during the cooling phase often results in poor overall energy conservation for coffee roasting equipment. Summary of the Invention

[0004] In order to solve the technical problem of poor overall energy-saving effect of coffee roasting equipment, the present invention proposes energy-saving coffee roasting equipment based on waste heat circulation and a control method thereof.

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

[0006] 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 the relative temperature deviation at the start time of the preset first explosion stage is determined based on the difference between the surface temperature of the bottom heating pipe collected at the start time of the preset first explosion stage and the preset first explosion temperature;

[0007] According to 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 adaptively adjusted for the first time, a preset observation time period under the first power adjustment is established;

[0009] According to the temperature change during the preset observation period under the first power adjustment, the heating power is adaptively adjusted for the second time;

[0010] Similarly, each heating power adjustment after the second heating power adjustment in the preset first explosion stage includes: adaptively adjusting the heating power according to the temperature change in the preset observation time 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 start time of the preset first explosion stage and the preset first explosion temperature is determined as the temperature difference factor at the start time 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 time of the preset first explosion stage is determined according to the ratio of the temperature difference factor at the start time of the preset first explosion stage to the temperature difference factor of the stage.

[0015] In combination with the first aspect above, in a possible implementation, the first adaptive adjustment of the heating power according to the relative temperature deviation at the start time of the preset first explosion stage includes:

[0016] The difference between the surface temperature of the bottom heating tube collected at the start 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 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 a positive number, the first correction power is set to 0, and the heating power is adjusted to the first correction power to implement the first heating power adjustment, wherein the first correction power is the heating power to be adjusted 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, a 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, thereby implementing 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 according to the temperatures at different preset positions 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.

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

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

[0022] The theoretical heating power of the heating tube when the temperature in the roasting box reaches the first crack temperature of the coffee beans is determined as the target theoretical power;

[0023] Determining the difference between the target theoretical power and the initial heating power as the initial power deviation, and determining the product of the initial power deviation and the initial temperature deviation as the initial power increment;

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

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

[0026] The absolute value of the difference between the temperatures at each of two preset positions collected at the start time of the preset first explosion stage is determined as the position temperature difference, thereby obtaining a set of position temperature differences at the start time of the preset first explosion stage;

[0027] Determining the temperature distribution uniformity at the start time of the preset first explosion stage according to the maximum value in the position temperature difference set at the start time of the preset first explosion stage;

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

[0029] If the temperature distribution uniformity at the start of the preset first explosion stage is less than or equal to the preset uniformity threshold, 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 a possible implementation, adaptively adjusting the heating power for the second time based on the temperature change within the preset observation time period under the first power adjustment includes:

[0031] 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 at different preset locations collected at the end of the preset observation period under the first power adjustment, and record it as the marked distribution uniformity. There are three preset locations, namely, the top, middle, and bottom heating tubes of the baking oven.

[0032] Collecting the temperature at each preset position at each moment within a preset observation time period under the first power adjustment to obtain a temperature sequence at each preset position under the first power adjustment;

[0033] 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;

[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 top temperature change direction value;

[0035] If the mark distribution uniformity is greater than the preset uniformity threshold and the top temperature change direction value is a positive number, the second correction power is set to 0, and the heating power is adjusted to the second correction power to implement the second heating power adjustment, wherein the second correction power is the heating power to be adjusted during the second heating power adjustment;

[0036] 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, then the second correction power is set to 0, and the heating power is adjusted to the second correction power to implement the second heating power adjustment;

[0037] If the mark distribution uniformity is greater than a preset uniformity threshold, the top temperature change direction value is a non-positive number, and the top temperature change rate is greater than a preset change threshold, then a 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 implement a second heating power adjustment;

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

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

[0040] determining the difference in heating power before and after the first power adjustment as a first power difference;

[0041] determining the target weight as 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;

[0042] multiplying the first power difference by the target weight to determine a 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 combination with the first aspect above, in a possible implementation, adjusting the heating power according to the relative temperature deviation at the end of the preset observation time 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 a positive number, the second correction power is set to 0, and the heating power is adjusted to the second correction power to implement 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 non-positive, a second corrected power is determined based on the marked temperature deviation and the heating power detected at the end of the preset observation time period under the first power adjustment, and the heating power is adjusted to the second corrected power to implement the second heating power adjustment;

[0048] If the marked 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 achieve the second heating power adjustment.

[0049] In combination with the first aspect above, in a possible implementation, determining the second corrected power according to the temperature sequence of different preset positions under the first power adjustment includes:

[0050] Determine the difference between the latter temperature and the former temperature of each adjacent two temperatures in the temperature sequence of each preset position under the first power adjustment as a reference temperature difference, and obtain a reference temperature difference set for each preset position under the first power adjustment;

[0051] Determine the average of all reference temperature differences in the reference temperature difference set at each preset position under the first power adjustment as the temperature trend characteristic value at each preset position under the first power adjustment;

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

[0053] P2=P1×(1-a end );

[0054] Wherein, P2 is the second corrected power; P1 is the first corrected power; a end is the marking temperature deviation;

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

[0056] P2=P1×(1+a end );

[0057] Wherein, P2 is the second corrected power; P1 is the first corrected power; a end is the marking temperature deviation;

[0058] If the temperature trend characteristic values of all preset positions under the first power adjustment are not all negative and not all positive, then the standard deviation of all temperatures in the temperature sequence of each preset position under the first power adjustment is determined as the target standard deviation of each preset position under the first power adjustment; based on the target standard deviation and temperature trend characteristic values of different preset positions under the first power adjustment, the formula corresponding to the similarity of the temperature characteristics in the box is determined as follows:

[0059] c = 1-norm(c1×c2);

[0060]

[0061] Where c is the similarity of temperature characteristics in the box; norm() is the normalization function; c1 represents the similarity of temperature characteristics between different positions in the box; c2 represents the overall temperature fluctuation in the box; N is the number of preset positions; i and k are the serial numbers of different preset positions; || is the absolute value function; F i is the temperature trend characteristic value of the i-th preset position under the first power adjustment; F k is the temperature trend characteristic value of the kth preset position under the first power adjustment; σ i is the target standard deviation of the i-th preset position under the first power adjustment; σ kis the target standard deviation of the kth preset position under the first power adjustment;

[0062] If the similarity of the temperature characteristics in the box is greater than a preset similarity threshold, the second correction power is set to the first correction power;

[0063] If the similarity of the temperature characteristics in the box is less than or equal to the preset similarity threshold, the second corrected 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 circulation, comprising a processor and a memory, wherein the processor is configured to process instructions stored in the memory to implement the method in the above-mentioned first aspect or any possible implementation manner of the first aspect.

[0065] In a third aspect, a server is provided, comprising a memory and a processor. The memory is configured to store executable program code, and the processor is configured to call and execute the executable program code from the memory, so that the device executes the method of the first aspect or any possible implementation of the first aspect.

[0066] In a fourth aspect, a computer program product is provided, comprising: a computer program code, which, when executed on a computer, enables the computer to execute the method in the first aspect or any possible implementation of the first aspect.

[0067] In a fifth aspect, a computer-readable storage medium is provided, which stores a computer program code. When the computer program code runs on a computer, the computer executes the method in the above-mentioned first aspect or any possible implementation of the first aspect.

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

[0069] The control method for energy-saving coffee roasting equipment based on waste heat circulation of the present invention not only activates the waste heat circulation during the cooling phase, but also activates the waste heat circulation during the preset first cracking phase, and adaptively adjusts the heating power at different times during the preset first cracking phase, thereby achieving energy saving during the first cracking phase and improving the overall energy saving effect of the coffee roasting equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

[0072] Figure 2 The figure is a structural diagram of a computer device of the present invention. DETAILED DESCRIPTION

[0073] To further illustrate the technical means and effects employed by the present invention to achieve its intended objectives, the following, in conjunction with the accompanying drawings and preferred embodiments, describes in detail the specific implementations, structures, features, and effects of the technical solutions proposed by the present invention. In the following description, references to "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0074] Unless defined otherwise, 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 belongs.

[0075] refer to Figure 1 , showing the process of some embodiments of the control method of energy-saving coffee roasting equipment based on waste heat circulation of the present invention. The control method of energy-saving coffee roasting equipment based on waste heat circulation includes the following steps:

[0076] Step S1: 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 the relative temperature deviation at the start time 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, may 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 may be the stage when the temperature inside the coffee roasting equipment reaches the first crack temperature but not the second crack temperature. The second crack stage may be the stage when the temperature inside the coffee roasting equipment reaches the second crack temperature. The second crack temperature is higher than the first crack temperature. The cooling stage may be the cooling stage at the end of the roasting process. An energy-saving coffee roasting equipment based on waste heat circulation may be one that utilizes waste heat circulation to achieve energy savings. For example, an energy-saving coffee roasting equipment based on waste heat circulation may be a cocoa bean energy-saving roasting device with waste heat multi-layer circulation disclosed in patent application No. 202123331716.4, which achieves energy savings through waste heat circulation. In embodiments of the present invention, the waste heat circulation is activated not only during the cooling stage at the end of the roasting process, but also, for example, during the first crack stage. The preset first crack stage may be the stage during which the coffee roasting equipment maintains residual heat after the first crack is completed during the roasting process, i.e., the first crack stage. The bottom heating pipe may be a heating pipe located at the bottom of the coffee roasting equipment. The surface temperature of the bottom heating tube may be the temperature of the upper surface of the heating tube at the bottom of the coffee roasting device. The preset first crack temperature may be a pre-set first crack temperature, which may be equal to 170 degrees Celsius.

[0078] It should be noted that first crack and second crack are stages in the coffee roasting process, occurring first and then second. First crack occurs at a lower temperature, while second crack has a higher temperature. Typically, first crack is at 170°C, and second crack at 220°C. During first crack, the temperature must be kept neither too high nor too low—that is, it must not fall below the first crack temperature nor rise above the second crack temperature. Otherwise, the first crack stage often fails to progress continuously. Alternatively, the beans within the roaster may struggle to maintain uniformity, for example, with some beans reaching the first crack temperature while others have already reached the second crack temperature, thus affecting roast quality. Therefore, strict temperature control is required during the first crack of the roaster, ensuring that all beans reach the first crack stage but not the second. During the first crack, it is important to ensure that there are no significant differences in the beans' stage within the roaster and that the crack points at all locations are synchronized. Residual heat circulation can be used to maintain the roasting temperature during this process. Adjusting the heating power of the heating tubes during this process prevents excessive temperatures and achieves energy savings.

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

[0080] In the first step, the absolute value of 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 temperature difference factor at the start time of the preset first explosion stage.

[0081] In the second step, the difference between the preset second explosion temperature and the preset first explosion temperature is determined as the stage temperature difference factor.

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

[0083] The third step is to determine the relative temperature deviation at the start time of the preset first explosion stage according to the ratio of the temperature difference factor at the start time of the preset first explosion stage to the temperature difference factor of the above stage.

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

[0085]

[0086] Where a0 is the relative temperature deviation at the start of the first detonation stage. || is the absolute value function. T10 is the surface temperature of the bottom heating pipe measured at the start of the first detonation stage. T1 is the first detonation temperature. T2 is the second detonation temperature. |T10-T1| is the temperature difference factor at the start of the first detonation stage. T2-T1 is the stage temperature difference factor.

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

[0088] Step S2: adaptively adjusting the heating power for the first time according to the relative temperature deviation at the start time of the preset first explosion stage.

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

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

[0091] In the first step, 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.

[0092] In the second step, if the initial temperature deviation is greater than the preset adjustment threshold and the initial temperature difference index is a positive number, the first correction power is set to 0, and the heating power is adjusted to the first correction power to achieve the first heating power adjustment.

[0093] The preset adjustment threshold may be a pre-set threshold, which may be equal to 2%. The first correction power may be the heating power to be adjusted when the heating power is adjusted for the first time.

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

[0095] In the third step, if the initial temperature deviation is greater than the preset adjustment threshold and the initial temperature difference index is non-positive, a 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.

[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 non-positive, it often indicates that the temperature is seriously low. Relying solely on waste heat circulation is often not enough to maintain the current temperature. It is often necessary to increase the heating power of the current heating tube to increase the baking temperature in the baking box.

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

[0098] In the first sub-step, the heating power detected at the start time of the preset first explosion stage is determined as the initial heating power.

[0099] In the second sub-step, the theoretical heating power of the heating tube when the temperature in the roasting box reaches the first crack temperature of the coffee beans is determined as the target theoretical power.

[0100] Among them, the roasting box equipment is also the coffee roasting equipment.

[0101] It should be noted that the target theoretical power is often the heating power of the heating tube when the equipment reaches the first crack temperature of the coffee beans, which is pre-set when the equipment leaves the factory.

[0102] In the third sub-step, 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.

[0103] In a fourth sub-step, the sum of the initial heating power and the initial power increment is determined as the first corrected power.

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

[0105] P1=P0+a0×(P-P0);

[0106] Where P1 is the first corrected power. P0 is the heating power measured at the start of the first crack, also known as 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 start of the first crack, also known as the initial temperature deviation. P is the theoretical heating power of the heating tube when the temperature inside the roasting oven reaches the first crack temperature of the coffee beans, also known as the target theoretical power.

[0107] It should be noted that while the theoretical power only considers the effect of the heat provided by the heating tubes on the box temperature, the actual required heating power is often less than the theoretical power due to the residual heat cycle during the first explosion stage. P1 can represent the actual required heating power.

[0108] In the fourth step, if the initial temperature deviation is less than or equal to the preset adjustment threshold, the first correction power is determined based on the temperatures at different preset positions 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 positions may be pre-set positions. For example, there may be three preset positions, which may be: the upper surface of the heating tube at the top of the coffee roasting device, the middle of the coffee roasting device, and the bottom of the coffee roasting device.

[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 tube, so as to minimize the situation where the heating tube needs to be restarted during the residual heat circulation stage after stopping the operation.

[0111] For example, determining the first corrected power according to the temperatures at different preset positions collected at the start time of the preset first explosion stage may include the following sub-steps:

[0112] In the first sub-step, the absolute value of the difference between the temperatures at each two preset positions collected at the start time of the preset first explosion stage is determined as the position temperature difference, thereby obtaining a set of position 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 time of the preset first explosion stage according to the maximum value in the position temperature difference set at the start time of the preset first explosion stage.

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

[0115]

[0116] Where b0 is the temperature distribution uniformity at the start of the preset first detonation stage. ΔT0 is the maximum value in the set of position temperature differences at the start of the preset first detonation stage, that is, the maximum absolute value of the temperature differences between different preset positions collected at the start of the preset first detonation stage. T1 is the preset first detonation temperature.

[0117] It's important to note that a larger b0 value indicates a higher consistency in temperature at different preset locations at the start of the first crack, which in turn indicates a more uniform temperature distribution within the coffee roasting machine. A more uniform temperature distribution makes the bottom temperature more representative of the actual roasting temperature within the entire coffee roasting machine, facilitating the optimal waste heat cycle and enabling the heater to be turned off.

[0118] In the third sub-step, if the temperature distribution uniformity at the start of the preset first explosion stage is greater than a preset uniformity threshold, the first correction power is set to a preset minimum power without turning off the heating tube.

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

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

[0121] It should be noted that when the temperature distribution uniformity at the start of the preset first crack stage is less than or equal to the preset uniformity threshold, the temperature distribution is considered to be insufficiently uniform. There is a large temperature difference between different temperatures throughout the coffee roasting equipment, and the roasting temperature of coffee beans at different locations varies greatly, seriously affecting the roasting quality of the coffee beans. In this case, increasing the motor power and thus the speed of the stirring shaft can make the temperatures of each layer in the box tend to be consistent, which can improve the roasting quality and maintain the current heating power of the heating tube, that is, the heating tube does not need to be adjusted.

[0122] Step S3: constructing a preset observation time period under the first power adjustment based on the moment when the heating power is adaptively adjusted for the first time.

[0123] It should be noted that the start time of the preset observation time period under the first power adjustment may be the next time after the first time the heating power is adaptively adjusted. The duration corresponding to the preset observation time period under the first power adjustment may be pre-set, which may be 2 minutes.

[0124] Step S4: adaptively adjust the heating power for the second time according to the temperature change within the preset observation time period under the first power adjustment.

[0125] It should be noted that the second time the heating power is adaptively adjusted may be the time next to the end time of the preset observation time 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 at different preset locations collected at the end of the preset observation period under the first power adjustment. This is recorded 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 time period under the first power adjustment can be the same as the method for obtaining the temperature distribution uniformity at the start of the preset first explosion stage, which will not be repeated here.

[0129] In the second step, the temperature at each preset position is collected at each moment in the preset observation time period under the first power adjustment to obtain a temperature sequence of each preset position under the first power adjustment.

[0130] In the third step, the top temperature change rate is determined 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 of the top of the baking oven under the first power adjustment may be the temperature at the end of a preset observation period under the first power adjustment. The first temperature in the temperature sequence of the top of the baking oven under the first power adjustment may 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 change of top temperature can be:

[0133]

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

[0135] In the fourth step, 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 top temperature change direction value.

[0136] In the fifth step, if the uniformity of the mark distribution is greater than the preset uniformity threshold and the top temperature change direction value is positive, 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.

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

[0138] It should be noted that when the mark distribution uniformity is greater than the preset uniformity threshold and the top temperature change direction value is positive, it often indicates that the temperature distribution is uniform and there is a temperature rise; it often means that maintaining a lower heating power of the heating tube at this time can also ensure that the temperature of the roasting box is maintained at a high state. At this time, it means that the roasting temperature can often be maintained until the coffee beans in the roasting box complete the first crack stage based on the residual heat circulation alone. In this case, 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 non-positive, and the top temperature change rate is less than or equal to the preset change threshold, 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.

[0140] It should be noted that when the uniformity of the above-mentioned mark distribution is greater than the preset uniformity threshold, the top temperature change direction value is non-positive, and the top temperature change rate 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; it often indicates that maintaining a lower heating power of the heating tube at this time can also ensure that the temperature of the roasting box is maintained at a high state. At this time, it means that the roasting temperature can often be maintained until the coffee beans in the roasting box complete the first crack stage based on the residual heat cycle alone. In this case, the heating tube can often be turned off.

[0141] In the seventh step, if the uniformity of the above-mentioned mark distribution is greater than the preset uniformity threshold, and the top temperature change direction value is non-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 decrease in the top temperature change exceeds a threshold, it often indicates that after reducing the heating power of the heating tube, the temperature inside the roasting box drops rapidly. At this time, relying solely on low-power heating and waste heat circulation is often not enough to ensure the temperature inside the roasting box to complete the roasting of the coffee beans. In this case, the heating power of the heating tube should often be increased.

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

[0144] In the first sub-step, the difference between the heating powers before and after the first power adjustment is determined as a first power difference.

[0145] In the second sub-step, 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 the target weight.

[0146] In the third sub-step, the product of the first power difference and the target weight is determined as the target power increment factor.

[0147] In the fourth sub-step, the sum of the heating power after the first power adjustment and the target power increment factor is determined as the second corrected power.

[0148] For example, based on the heating power before and after the first power adjustment and the top temperature change rate, 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, that is, the heating power after the first power adjustment. P0 is the heating power detected at the start of the preset first explosion stage, that is, the heating power before the first power adjustment. δT1 is the rate of change of the top temperature. T end is the last temperature in the temperature sequence of the oven top at the first power adjustment. P0-P1 is the first power difference. is the target weight. is the target power increment factor.

[0151] In the eighth step, 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 time period under the first power adjustment, and adjust the heating power according to the relative temperature deviation at the end of the preset observation time period under the first power adjustment to achieve the second heating power adjustment.

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

[0153] In the first sub-step, the relative temperature deviation at the end of the preset observation time 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 time period under the first power adjustment and the preset first explosion temperature is determined 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 a positive number, 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 non-positive, the second corrected power is determined based on the above-mentioned marked temperature deviation and the heating power detected at the end of the preset observation time period under the first power adjustment, and the heating power is adjusted to the second corrected power to achieve the second heating power adjustment. The method for obtaining the second corrected power in this sub-step can be the same as the method for obtaining the first corrected power in the third step in step S2, and will not be repeated again.

[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 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 achieve the second heating power adjustment.

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

[0158] First, the difference between the latter and the previous temperature in each adjacent two temperatures in the temperature sequence of each preset position under the first power adjustment is determined as the reference temperature difference, thereby obtaining a 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 at the preset position under the first power adjustment may be:

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

[0161] Among them, f i,j is the jth reference temperature difference in the reference temperature difference set at the i-th preset position under the first power adjustment. i is the sequence number of the preset position. j is the sequence number of the reference temperature difference in the reference temperature difference set. T i,j+1 is the j+1th temperature in the temperature sequence of the i-th preset position under the first power adjustment. i,j is the jth temperature in the temperature sequence of the i-th preset position under the first power adjustment.

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

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

[0164] P2=P1×(1-a end );

[0165] Wherein, P2 is the second corrected power; P1 is the first corrected power; a end is the marker temperature deviation.

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

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

[0168] P2=P1×(1+a end );

[0169] Wherein, P2 is the second corrected power; P1 is the first corrected power; a end is the marker temperature deviation.

[0170] Continuing, if the temperature trend characteristic values of all preset positions under the first power adjustment are not all negative and not all positive, the standard deviation of all temperatures in the temperature sequence of each preset position under the first power adjustment is determined as the target standard deviation of each preset position under the first power adjustment; based on the target standard deviation and temperature trend characteristic values of different preset positions under the first power adjustment, the formula corresponding to the similarity of the temperature characteristics in the cabinet is determined as follows:

[0171] c = 1-norm(c1×c2);

[0172]

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

[0174] It should be noted that, when c is larger, it often indicates that the temperature stability in the coffee roasting equipment is higher.

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

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

[0177] It's important to note that if the temperature characteristics within the roaster are highly similar, the combined heat provided by the heating tubes and the residual heat circulation ensures sufficient heat for the first crack. Turning off the heating tubes or adjusting their power at this point will disrupt the stable temperature within the roaster, affecting the roasting quality of the coffee beans. Therefore, adjusting the heating tube power is not necessary.

[0178] Finally, if the similarity of the temperature characteristics in the box is less than or equal to the preset similarity threshold, the second corrected power is set to the preset minimum power.

[0179] Step S5, similarly, 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.

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

[0181] Optionally, after multiple adaptive adjustments to the heating power, if none of these adjustments resulted in a change in the heating power, a straight line fit is performed to the similarities in the chamber temperature characteristics during these multiple adaptive adjustments, with time plotted on the horizontal axis and the similarities in the chamber temperature characteristics plotted on the vertical axis. If the slope of this fitted line is non-negative, this often indicates that despite no adjustment to the heating tube power during these observation periods, the roasting chamber temperature gradually stabilized, indicating that the current heating tube heating temperature often met the first crack temperature requirement during the roasting process. The heating tube power is not adjusted at this point. If the slope of this fitted line is negative, this often indicates that over time, temperatures at different locations may have experienced severe stratification and a trend of increasing stratification, making it difficult to achieve consistent roasting temperatures. This is often considered to be a temperature anomaly, and stirring alone is often insufficient to achieve consistent roasting temperatures. In this case, the heating tubes can be turned off to prevent burning of the coffee beans at the bottom, while water is added to the container to ensure sufficient airflow for residual heat circulation.

[0182] Optionally, the waste heat cycle can be started in the preset second explosion stage to achieve energy saving in the preset second explosion stage, and 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, which will not be repeated here.

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

[0184] Figure 2 FIG. 1 is a schematic diagram of the structure of a computer device provided by an embodiment of the present invention. For example, 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. When the processor 202 executes the computer program 203, the computer device can execute any of the control methods for energy-saving coffee roasting equipment based on waste heat circulation described above.

[0185] Based on the same inventive concepts as the above-described method embodiments, the present invention provides a server comprising a memory and a processor. The memory is configured to store executable program code, and the processor is configured to retrieve and execute the executable program code from the memory, thereby causing the server to execute any of the above-described methods for controlling energy-saving coffee roasting equipment based on waste heat recycling.

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

[0187] Based on the same inventive concept as the above-described method embodiment, the present invention provides a computer-readable storage medium storing computer program code. When the computer program code is executed on a computer, the computer executes any of the above-described methods for controlling energy-saving coffee roasting equipment based on waste heat circulation.

[0188] In summary, on the basis of starting the waste heat circulation in the cooling stage, the waste heat circulation is also started in the preset first crack stage, and the heating power at different times of the preset first crack stage is adaptively adjusted, thereby achieving energy saving in the first crack stage and 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, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A control method for energy-saving coffee roasting equipment based on waste heat circulation, characterized in that: The following steps are involved: 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 the relative temperature deviation at the start time of the preset first explosion stage is determined based on the difference between the surface temperature of the bottom heating pipe collected at the start time of the preset first explosion stage and the preset first explosion temperature; According to the relative temperature deviation at the start time of the preset first explosion stage, the heating power is adaptively adjusted for the first time; Based on the moment when the heating power is adaptively adjusted for the first time, a preset observation time period under the first power adjustment is established; According to the temperature change during the preset observation period under the first power adjustment, the heating power is adaptively adjusted for the second time; Similarly, each heating power adjustment after the second heating power adjustment in the preset first explosion stage includes: adaptively adjusting the heating power according to the temperature change in the preset observation time period under the previous power adjustment.

2. The control method of energy-saving coffee roasting equipment based on waste heat circulation according to claim 1, characterized in that: The step of determining the relative temperature deviation at the start time of the preset first explosion stage according to 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: The absolute value of 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 temperature difference factor at the start time of the preset first explosion stage; The difference between the preset second explosion temperature and the preset first explosion temperature is determined as the stage temperature difference factor; The relative temperature deviation at the start time of the preset first explosion stage is determined according to the ratio of the temperature difference factor at the start time of the preset first explosion stage to the temperature difference factor of the stage.

3. The control method of energy-saving coffee roasting equipment based on waste heat circulation according to claim 1, characterized in that: The first adaptive adjustment of the heating power according to the relative temperature deviation at the start time of the preset first explosion stage includes: The difference between the surface temperature of the bottom heating tube collected at the start 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 of the preset first explosion stage is determined as the initial temperature deviation; If the initial temperature deviation is greater than the preset adjustment threshold and the initial temperature difference index is a positive number, the first correction power is set to 0, and the heating power is adjusted to the first correction power to implement the first heating power adjustment, wherein the first correction power is the heating power to be adjusted during the first heating power adjustment; If the initial temperature deviation is greater than the preset adjustment threshold and the initial temperature difference index is non-positive, a 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, thereby implementing 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 temperatures at different preset positions 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.

4. The control method of energy-saving coffee roasting equipment based on waste heat circulation according to claim 3, characterized in that: The determining of the first corrected power according to the initial temperature deviation and the heating power detected at the start time of the preset first explosion stage includes: The heating power detected at the start of the preset first explosion stage is determined as the initial heating power; The theoretical heating power of the heating tube when the temperature in the roasting box reaches the first crack temperature of the coffee beans is determined as the target theoretical power; Determining the difference between the target theoretical power and the initial heating power as the initial power deviation, and determining the product of the initial power deviation and the initial temperature deviation as the initial power increment; The sum of the initial heating power and the initial power increment is determined as the first corrected power.

5. The control method of energy-saving coffee roasting equipment based on waste heat circulation according to claim 3, characterized in that: The determining of the first corrected power according to the temperatures at different preset positions collected at the start time of the preset first explosion stage includes: The absolute value of the difference between the temperatures at each of two preset positions collected at the start time of the preset first explosion stage is determined as the position temperature difference, thereby obtaining a set of position temperature differences at the start time of the preset first explosion stage; Determining the temperature distribution uniformity at the start time of the preset first explosion stage according to the maximum value in the position temperature difference set at the start time of the preset first explosion stage; If the temperature distribution uniformity at the start of the preset first explosion stage is greater than a preset uniformity threshold, the first corrected power is set to a preset minimum power; If the temperature distribution uniformity at the start of the preset first explosion stage is less than or equal to the preset uniformity threshold, the first correction power is set to the heating power detected at the start of the preset first explosion stage.

6. The control method of energy-saving coffee roasting equipment based on waste heat circulation according to claim 5, characterized in that: The second adaptive adjustment of the heating power according to the temperature change in the preset observation time period under the first power adjustment includes: 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 at different preset locations collected at the end of the preset observation period under the first power adjustment, and record it as the marked distribution uniformity. There are three preset locations, namely, the top, middle, and bottom heating tubes of the baking oven. Collecting the temperature at each preset position at each moment within a preset observation time period under the first power adjustment to obtain a temperature sequence at each preset position under the first power adjustment; 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; 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 top temperature change direction value; If the mark distribution uniformity is greater than the preset uniformity threshold and the top temperature change direction value is a positive number, the second correction power is set to 0, and the heating power is adjusted to the second correction power to implement the second heating power adjustment, wherein the second correction power is the heating power to be adjusted during 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, then the second correction power is set to 0, and the heating power is adjusted to the second correction power to implement the second heating power adjustment; If the mark distribution uniformity is greater than a preset uniformity threshold, the top temperature change direction value is a non-positive number, and the top temperature change rate is greater than a preset change threshold, then a 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 implement a second heating power adjustment; If the uniformity of the mark distribution is less than or equal to the preset uniformity threshold, determine the relative temperature deviation at the end of the preset observation time period under the first power adjustment, and adjust the heating power according to the relative temperature deviation at the end of the preset observation time period under the first power adjustment to achieve the second heating power adjustment.

7. The control method of energy-saving coffee roasting equipment based on waste heat circulation according to claim 6, characterized in that: The determining of the second corrected power according to the heating power before and after the first power adjustment and the top temperature change rate includes: determining the difference in heating power before and after the first power adjustment as a first power difference; determining the target weight as 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; multiplying the first power difference by the target weight to determine 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 corrected power.

8. The control method of energy-saving coffee roasting equipment based on waste heat circulation according to claim 6, characterized in that: The step of adjusting the heating power according to the relative temperature deviation at the end of the preset observation time period under the first power adjustment includes: 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; If the marked temperature deviation is greater than the preset adjustment threshold and the marked 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 implement the second heating power adjustment; If the marked temperature deviation is greater than the preset adjustment threshold and the marked temperature difference index is non-positive, a second corrected power is determined based on the marked temperature deviation and the heating power detected at the end of the preset observation time period under the first power adjustment, and the heating power is adjusted to the second corrected power to implement the second heating power adjustment; If the marked 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 achieve the second heating power adjustment.

9. The control method of energy-saving coffee roasting equipment based on waste heat circulation according to claim 8, characterized in that: The determining of the second corrected power according to the temperature sequence of different preset positions under the first power adjustment includes: Determine the difference between the latter temperature and the former temperature of each adjacent two temperatures in the temperature sequence of each preset position under the first power adjustment as a reference temperature difference, and obtain a reference temperature difference set for each preset position under the first power adjustment; Determine the average of all reference temperature differences in the reference temperature difference set at each preset position under the first power adjustment as the temperature trend characteristic value at 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, then the formula corresponding to the second corrected power is determined according to the marked temperature deviation: P2=P1×(1-a end ); Wherein, P2 is the second corrected power; P1 is the first corrected power; a end is the marking temperature deviation; If the temperature trend characteristic values of all preset positions under the first power adjustment are negative, then the formula corresponding to the second corrected power is determined according to the marked temperature deviation: P2=P1×(1+a end ); Wherein, P2 is the second corrected power; P1 is the first corrected power; a end is the marking temperature deviation; If the temperature trend characteristic values of all preset positions under the first power adjustment are not all negative and not all positive, then the standard deviation of all temperatures in the temperature sequence of each preset position under the first power adjustment is determined as the target standard deviation of each preset position under the first power adjustment; based on the target standard deviation and temperature trend characteristic values of different preset positions under the first power adjustment, the formula corresponding to the similarity of the temperature characteristics in the box is determined as follows: c = 1-norm(c1×c2); Where c is the similarity of temperature characteristics in the box; norm() is the normalization function; c1 represents the similarity of temperature characteristics between different positions in the box; c2 represents the overall temperature fluctuation in the box; N is the number of preset positions; i and k are the serial numbers of different preset positions; || is the absolute value function; F i is the temperature trend characteristic value of the i-th preset position under the first power adjustment; F k is the temperature trend characteristic value of the kth preset position under the first power adjustment; σ i is the target standard deviation of the i-th preset position under the first power adjustment; σ k is the target standard deviation of the kth preset position under the first power adjustment; If the similarity of the temperature characteristics in the box is greater than a preset similarity threshold, the second correction power is set to the first correction power; If the similarity of the temperature characteristics in the box is less than or equal to the preset similarity threshold, the second corrected power is set to the preset minimum power.

10. An energy-saving coffee roasting device based on waste heat circulation, characterized in that: The invention comprises a processor and a memory, wherein the processor is used to process instructions stored in the memory to implement a control method for energy-saving coffee roasting equipment based on waste heat circulation according to any one of claims 1 to 9.

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