Temperature control method, temperature control system, dryer and controller for a plurality of dryers

Abstract

The embodiment of the present application provides a temperature adjusting method, a temperature adjusting system, a dryer and a controller for multiple dryers. Each dryer comprises a temperature adjusting mechanism, each temperature adjusting mechanism comprises a hot air door, the multiple dryers use a same heat source, and the temperature adjusting method comprises the following steps: determining a target drying temperature interval of a to-be-dried object in each dryer; in the process of starting the heat source to supply heat to the multiple dryers, acquiring the inlet temperature and the current drying temperature of the hot air door of each dryer in real time, so as to control the temperature adjusting mechanism to adjust the opening degree of the hot air door of each dryer, so that the current drying temperature is in the target drying temperature interval. The hot air is generated by the heat source, and the drying temperature required, the temperature after heat energy loss and the current drying temperature are used to realize accurate temperature control for each dryer. Therefore, heat energy is fully utilized, and the temperature adjusting method of one heat source corresponding to multiple dryers is realized.

Description

Technical Field

[0001] This application relates to the field of agricultural dryer technology, specifically to a temperature control method, temperature control system, dryer, storage medium and controller for multiple dryers. Background Technology

[0002] In grain drying operations, the temperature control requirements are typically very high due to differences in grain variety, operating area, moisture content, and intended use. However, relying on past experience-based drying methods has led to problems such as excessively high breakage and cracking rates in the dried grain. Current grain drying methods usually directly control the drying temperature by controlling the heat source (combustion furnace, electric heat pump, gas furnace). This method has two drawbacks. First, it cannot use a single heat source for multiple grain dryers, as the hot air temperature varies at each stage of the dryer, making it impossible to control the drying temperature of each individual dryer. Second, it is not conducive to the full utilization of heat energy. Each grain dryer is at a different drying stage and requires a different drying temperature; directly controlling the heat source temperature makes it difficult to judge temperature drops and rationally utilize heat energy, resulting in energy loss. Summary of the Invention

[0003] The purpose of this application is to provide a temperature control method, temperature control system, dryer, storage medium, and controller for multiple dryers.

[0004] To achieve the above objectives, a first aspect of this application provides a temperature control method for multiple dryers, each dryer including a temperature control mechanism, each temperature control mechanism including a hot air damper, and multiple dryers using the same heat source. The temperature control method includes:

[0005] Determine the target drying temperature range for the objects to be dried in each dryer;

[0006] During the process of starting the heat source to provide hot air to multiple dryers, the inlet temperature of the hot air damper of each dryer and the current drying temperature are obtained in real time.

[0007] For each dryer, the opening of the hot air damper is adjusted by the temperature control mechanism based on the current drying temperature, the target drying temperature range, and the inlet air temperature, so that the current drying temperature is within the target drying temperature range.

[0008] In embodiments of this application, the temperature control mechanism of each dryer further includes a hot air damper baffle disposed on the hot air damper. For each dryer, controlling the temperature control mechanism to adjust the opening of the hot air damper of the dryer according to the current drying temperature, the target drying temperature range, and the inlet temperature, so that the current drying temperature is within the target drying temperature range, includes: for each dryer, determining a first target angle for rotation of the hot air damper baffle corresponding to the dryer according to the current drying temperature, the target drying temperature range, and the inlet temperature; for each dryer, controlling the hot air damper baffle to rotate to the first target angle to adjust the opening of the hot air damper, so that the current drying temperature is within the target drying temperature range.

[0009] In the embodiments of this application, the temperature control mechanism of each dryer further includes multiple cold air dampers and cold air damper baffles corresponding to each cold air damper. The temperature control method further includes: for each dryer, determining a second target angle at which each cold air damper baffle needs to be closed based on a first target angle; for each dryer, controlling each cold air damper baffle to rotate by the second target angle to adjust the opening of the corresponding cold air damper so as to stabilize the pressure inside the dryer.

[0010] In the embodiments of this application, the temperature control mechanism of each dryer further includes a driver and a stepper motor. The driver includes a position mode. For each dryer, controlling the hot air damper to rotate to a first target angle to adjust the opening of the hot air damper includes: for each dryer, controlling the driver to send a corresponding pulse to the stepper motor according to the first target angle, so that the stepper motor drives the hot air damper to rotate to the first target angle to adjust the opening of the hot air damper.

[0011] In the embodiments of this application, the driver includes a zero-return mode, and the temperature control method further includes: for each dryer, when the dryer finishes drying or switches to the next drying stage, controlling the driver to enter the zero-return mode to control the stepper motor to stop at the zero position, so that the hot air damper stops rotating.

[0012] In embodiments of this application, determining the target drying temperature range for the object to be dried in each dryer includes: for each dryer, obtaining information about the object to be dried, including at least one of temperature, operating area, moisture content, and type; for each dryer, determining the target drying temperature range for the object to be dried based on the information; and / or obtaining the temperature range for each dryer input by the user as the target drying temperature range for the object to be dried in each dryer.

[0013] A second aspect of this application provides a controller configured to perform the temperature control method described above for multiple dryers.

[0014] A third aspect of this application provides a dryer, comprising:

[0015] Temperature control mechanism, including hot air damper, used to adjust the opening degree of hot air damper;

[0016] The first temperature sensor is used to detect the inlet temperature of the hot air damper;

[0017] A second temperature sensor is used to detect the current drying temperature of the dryer; and

[0018] The controller is configured to perform the temperature control method described above for multiple dryers.

[0019] In the embodiments of this application, the temperature control mechanism of the dryer further includes: a hot air damper baffle, which is disposed on the hot air damper and used to adjust the opening degree of the hot air damper; and multiple cold air dampers, each of which is provided with a cold air damper baffle and used to adjust the opening degree of the corresponding cold air damper.

[0020] In embodiments of this application, the temperature control mechanism of the dryer further includes: a driver for sending pulse information to a stepper motor; and a stepper motor for driving the hot air damper to rotate based on the pulse information.

[0021] In embodiments of this application, the dryer further includes: a human-machine interaction device for acquiring information on the object to be dried input by the user for the dryer, the information on the object to be dried including at least one of temperature, operating area, moisture value and type; and / or the human-machine interaction device for acquiring a temperature range for the dryer input by the user; the controller is further configured to use the temperature range input by the user as the target drying temperature range for the corresponding object to be dried in the dryer.

[0022] The fourth aspect of this application provides a temperature control system for multiple dryers, the temperature control system comprising:

[0023] The heat source provides hot air to the dryer;

[0024] At least one of the aforementioned dryers.

[0025] The fifth aspect of this application provides yet another temperature control system for multiple dryers, the temperature control system comprising:

[0026] The heat source provides hot air to multiple dryers;

[0027] At least one dryer, each dryer including a hot air damper, a first temperature sensor, and a second temperature sensor, the first temperature sensor being used to detect the inlet temperature of the corresponding hot air damper, and the second temperature sensor being used to detect the current drying temperature of the corresponding dryer; and

[0028] The controller is configured to perform the temperature control method described above for multiple dryers.

[0029] A sixth aspect of this application provides a machine-readable storage medium storing instructions that, when executed by a controller, configure the controller to perform the aforementioned temperature control method for multiple dryers.

[0030] Through the above technical solution, each temperature control mechanism includes a hot air damper. Multiple dryers use the same heat source, and the target drying temperature range for the object to be dried in each dryer is determined. During the process of starting the heat source to heat multiple dryers, the inlet temperature of the hot air damper and the current drying temperature of each dryer are acquired in real time. For each dryer, the opening of the hot air damper is adjusted according to the current drying temperature, the target drying temperature range, and the inlet temperature to ensure that the current drying temperature is within the target drying temperature range. By generating hot air through the heat source, and then accurately controlling the temperature of each dryer based on the required drying temperature of the object to be dried, the temperature after heat loss, and the current drying temperature, thermal energy is fully utilized, enabling a drying method where one heat source corresponds to multiple dryers, and avoiding excessively frequent damper operation due to temperature adjustment.

[0031] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. In the drawings:

[0033] Figure 1 This illustration schematically shows an application environment for a temperature control system for multiple dryers according to an embodiment of this application;

[0034] Figure 2 A schematic flowchart illustrating a temperature control method for multiple dryers according to an embodiment of this application is shown.

[0035] Figure 3 A schematic diagram of a temperature control mechanism according to an embodiment of this application is shown;

[0036] Figure 4 A schematic diagram of a temperature control mechanism according to yet another embodiment of this application is shown;

[0037] Figure 5 The schematic diagram illustrates a temperature control method for multiple dryers according to another embodiment of this application;

[0038] Figure 6 A schematic diagram of a temperature control algorithm for multiple dryers according to an embodiment of this application is shown.

[0039] Figure 7 A schematic diagram of a dryer according to an embodiment of this application is shown.

[0040] Figure 8 A schematic diagram illustrating a temperature control system for multiple dryers according to an embodiment of this application is shown.

[0041] Figure 9 A schematic diagram of a temperature control system for multiple dryers according to another embodiment of this application is shown.

[0042] Figure 10 A schematic diagram of the electrical control system of each dryer according to an embodiment of this application is shown.

[0043] Figure 11 The diagram illustrates the internal structure of a computer device according to an embodiment of this application.

[0044] Explanation of reference numerals in the attached figures

[0045] 10 - Heat source; 20 - Cloud platform processor; 30 - GPS terminal; 40 - Hot air duct; N1, N2, N3 - Dryer; 51a, 51b, 51c - Temperature control mechanism; 52a, 52b, 52c - First temperature sensor; 1 - Hot air damper; 2 - Hot air damper baffle; 3a, 3b - Cold air damper; 4a, 4b - Cold air damper baffle; 710 - Temperature control mechanism; 711 - Hot air damper; 712 - Hot air damper baffle; 713 - Cold air damper; 714 - Cold air damper baffle; 715 - Driver; 716 - Stepper motor; 720 - First temperature sensor; 730 - Second temperature sensor; 740 - Controller; 810 - Heat source; 910 - Heat source; 920 - Dryer; 930 - Controller Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the embodiments of this application and are not intended to limit the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0047] refer to Figure 1In one embodiment, a temperature control system 100 for multiple dryers is provided. The temperature control system 100 includes a heat source 10, a cloud platform processor 20, a GPS terminal 30, a hot air duct 40, and multiple dryers N1, N2, N3… Dryer N1 includes a temperature control mechanism 51a, a first temperature sensor 52a, and a second temperature sensor 53a. Dryer N2 includes a temperature control mechanism 51b, a first temperature sensor 52b, and a second temperature sensor 53b. Dryer N3 includes a temperature control mechanism 51c, a first temperature sensor 52c, and a second temperature sensor 53c. The dryers can be used to dry materials such as grains, food, medicinal materials, wood, and leather. Each temperature control mechanism's hot air damper is equipped with a first temperature sensor, which can detect the inlet temperature of the hot air damper in real time. Hot air generated by the heat source 10 flows through the hot air duct 40 and into the dryer's interior via the hot air damper through the temperature control mechanism of each dryer. Each dryer is equipped with a second temperature sensor to monitor the current drying temperature inside the dryer in real time. All data generated by the temperature control system 100 is transmitted to the GPS terminal 30 via RS485 communication. The GPS terminal 30 then transmits the data to the cloud platform processing 20 for recording and processing via a wireless transmission protocol.

[0048] Figure 2 A schematic flowchart illustrating a temperature control method for multiple dryers according to an embodiment of this application is shown. Figure 2 As shown in one embodiment of this application, a temperature control method for multiple dryers is provided. Each dryer includes a temperature control mechanism, and each temperature control mechanism includes a hot air damper. The multiple dryers use the same heat source. This embodiment mainly illustrates the application of this method to a controller, and includes the following steps:

[0049] S202, determine the target drying temperature range for the objects to be dried in each dryer.

[0050] S204: During the process of starting the heat source to supply heat to multiple dryers, the inlet temperature of the hot air damper of each dryer and the current drying temperature are obtained in real time.

[0051] S206, for each dryer, adjusts the opening of the hot air damper of the dryer according to the current drying temperature, the target drying temperature range and the air inlet temperature, so that the current drying temperature is within the target drying temperature range.

[0052] The materials to be dried can be grains, food, medicinal herbs, wood, leather, etc. The target drying temperature range refers to the optimal temperature range for drying the material, which is determined by the material's own properties. For example, when drying grains, the target drying temperature range is determined by factors such as the grain variety, moisture content, and the grain's own temperature. During the process of supplying heat to multiple dryers from the heat source, there is some heat loss as hot air is transported to each dryer through hot air ducts. Because the distance between each dryer and the heat source varies, the inlet temperature of the hot air damper in each dryer may differ. There is a temperature drop at the inlet of each dryer, so it is necessary to maintain the inlet temperature of the hot air damper in each dryer higher than the actual drying temperature required by the material. Therefore, the controller can obtain the inlet temperature of the hot air damper in each dryer and the current drying temperature inside each dryer in real time. Based on the current drying temperature, the target drying temperature range, and the inlet air temperature, the controller can control the temperature control mechanism to adjust the opening of the hot air damper in the dryer, thereby adjusting the amount of hot air entering the dryer to ensure that the current drying temperature is within the target drying temperature range. If there is a significant difference between the current drying temperature and the target drying temperature range, the temperature control mechanism can be controlled to increase the opening of the hot air damper. If the current drying temperature is within the target drying temperature range, the temperature control mechanism can be controlled to stop adjusting, maintaining the current opening of the hot air damper. Setting a target drying temperature range avoids frequent adjustments to the hot air damper opening by the temperature control mechanism, thus reducing energy consumption.

[0053] In one embodiment, determining the target drying temperature range for the object to be dried in each dryer includes: for each dryer, obtaining information about the object to be dried, including at least one of temperature, operating area, moisture content, and type; for each dryer, determining the target drying temperature range for the object to be dried based on the information about the object to be dried; and / or obtaining the temperature range for each dryer input by the user as the target drying temperature range for the object to be dried in each dryer.

[0054] For each dryer, the controller can acquire information about the object to be dried inside the dryer. The target drying temperature range is determined by multiple factors. For example, if the object to be dried is grain, different grain varieties require different drying temperatures, different drying stages of the grain have different temperature requirements, and the initial moisture content of the grain also affects the temperature requirements. The controller can acquire at least one of the following: grain temperature, operating area, moisture content, and type. Each dryer can be equipped with a moisture meter to detect the moisture content of the grain. Based on the above information, the controller can divide the drying process into multiple temperature ranges corresponding to different drying stages. Alternatively, the user can input a specific temperature range for each dryer as the target drying temperature range. Specifically, the user can input information about the object to be dried, including temperature, operating area, moisture content, type, and drying time, through the HMI touchscreen. Alternatively, the user can directly input the target drying temperature range for the object through the HMI touchscreen.

[0055] In one embodiment, the temperature control mechanism of each dryer further includes a hot air damper baffle disposed on the hot air damper. For each dryer, controlling the temperature control mechanism to adjust the opening of the hot air damper of the dryer according to the current drying temperature, the target drying temperature range, and the inlet temperature, so that the current drying temperature is within the target drying temperature range, includes: for each dryer, determining a first target angle for rotation of the hot air damper baffle corresponding to the dryer according to the current drying temperature, the target drying temperature range, and the inlet temperature; for each dryer, controlling the hot air damper baffle to rotate to the first target angle to adjust the opening of the hot air damper, so that the current drying temperature is within the target drying temperature range.

[0056] like Figure 3 As shown, each temperature control mechanism includes a hot air damper 1 and a hot air damper baffle 2. The hot air damper baffle 2 is positioned in front of the hot air damper 1, and the opening degree of the hot air damper 1 can be adjusted by rotating the hot air damper baffle 2. Therefore, for each dryer, the controller can determine the first target rotation angle of the hot air damper baffle of that dryer's temperature control mechanism based on the current drying temperature, the target drying temperature range, and the inlet air temperature. Specifically, the rotation range of the hot air damper baffle is 0-90°. At 0°, the baffle completely blocks the hot air inlet, resulting in zero hot air intake. At 90°, the baffle has no blocking effect, and the hot air intake is at its maximum. The opening degree of the hot air damper determines the amount of hot air entering and the drying temperature inside each dryer, and its opening degree is jointly determined by the inlet air temperature of the hot air damper and the target drying temperature range of each object to be dried. In this way, the drying temperature inside each dryer can be the optimal temperature for drying the object.

[0057] In one embodiment, the temperature control mechanism of each dryer further includes multiple cold air dampers and a cold air damper baffle corresponding to each cold air damper. The temperature control method further includes: for each dryer, determining a second target angle at which each cold air damper baffle needs to be closed based on a first target angle; and for each dryer, controlling each cold air damper baffle to rotate by the second target angle to adjust the opening of the corresponding cold air damper so as to stabilize the pressure inside the dryer.

[0058] refer to Figure 3 Each temperature control mechanism includes a hot air damper 1, a hot air damper baffle 2, a cold air damper 3a, a cold air damper baffle 4a, a cold air damper 3b, and a cold air damper baffle 4b. The hot air damper baffle 2 is positioned in front of the hot air damper 1; rotating the hot air damper baffle 2 adjusts the opening of the hot air damper 1. Cold air dampers 3a and 3b are located on either side of the hot air damper. Cold air damper 3a is equipped with a cold air damper baffle 4a, and cold air damper 3b is equipped with a cold air damper baffle 4b. For each dryer, when the hot air damper baffle 2 rotates to a first target angle, the controller determines the second target angle at which the cold air dampers 4a and 4b need to close, and controls them to rotate to the second target angle, thereby adjusting the opening of the two cold air dampers 4a and 4b respectively, maintaining equal negative pressure for the incoming hot air to stabilize the pressure inside the dryer. Specifically, the hot air damper's rotation range is 0-90°. When the hot air damper rotates 0°, it completely blocks the hot air intake, resulting in zero hot air intake, and the cold air damper is at its maximum opening. When the hot air damper rotates 90°, it has no blocking effect, resulting in maximum hot air intake, and the cold air damper is completely closed.

[0059] In one embodiment, the temperature control mechanism of each dryer further includes a driver and a stepper motor. The driver includes a position mode. For each dryer, controlling the hot air damper to rotate to a first target angle to adjust the opening of the hot air damper includes: for each dryer, if the current drying temperature is not within the target drying temperature range, controlling the driver to enter the position mode; and when the driver of each temperature control mechanism is in the position mode, controlling the driver to send a corresponding pulse to the stepper motor according to the first target angle, so that the stepper motor drives the hot air damper to rotate to the first target angle to adjust the opening of the hot air damper.

[0060] In one embodiment, the driver includes a zero-return mode, and the temperature control method further includes: for each dryer, when the dryer finishes drying or switches to the next drying stage, controlling the driver to enter the zero-return mode to control the stepper motor to stop at the zero position, so that the hot air damper stops rotating.

[0061] The opening degree of the hot air damper determines the amount of hot air entering and the drying temperature inside each dryer. This opening degree is determined by factors such as the inlet temperature of the hot air damper and the target drying temperature range for each object to be dried. The target drying temperature range is determined by the temperature of the grain, the operating area, the moisture content, and the type of grain. The controller can obtain the temperature, operating area, moisture content, type, and drying time input by the user on the HMI touchscreen for the object to be dried, and determine the target drying temperature range for each dryer. Based on the inlet temperature of the hot air damper detected by the first temperature sensor, the current drying temperature inside the dryer detected by the second temperature sensor, and the target drying temperature range, the controller can determine the first target rotation angle required for the hot air damper baffle and the second target rotation angle required for each of the two cold air damper panels to close. The controller's built-in PID algorithm then outputs a signal value to the driver, putting the driver into position mode. The driver sends corresponding pulse signals to the stepper motor, which receives these pulse signals and precisely controls its rotation degree; one pulse signal represents 0.8 degrees. Upon receiving a pulse signal, the stepper motor drives the hot air damper to rotate by a first target rotation angle, adjusting the damper's opening to maintain the drying temperature within the target range. When the dryer finishes drying or switches to the next drying stage, the controller puts the driver into a zero-return mode, stopping the stepper motor at the zero position and halting the hot air damper's rotation. (Reference) Figure 4 The temperature control mechanism also includes an HMI touchscreen, PLC controller, driver, moisture meter, stepper motor, electrical protection and actuators (not shown in the figure). The hot air damper is driven by a stepper motor. Stepper motors have advantages such as high control precision and ease of control. The driver can be a communication driver, which has the advantage of freeing it from the constraints of transistor controllers. It can also synchronously upload and record the damper opening and the corresponding hot air temperature.

[0062] refer to Figure 5In one specific embodiment, another temperature control method for multiple dryers is provided. For each dryer, a first temperature sensor detects the inlet temperature of the hot air damper in real time, and a second temperature sensor detects the current drying temperature inside the dryer in real time. Information such as the temperature, operating area, moisture content, and type of grain inside the dryer, input by the user via the HMI touchscreen, is then acquired to set the corresponding target drying temperature range. A PID algorithm program written within the PLC controller processes and calculates the collected data to determine the first target rotation angle of the hot air damper and the second target rotation angle of the cold air damper. This signal is sent to the driver via RS485 communication. The driver converts the received signal into a relevant pulse signal and sends it to the stepper motor, thereby driving the hot air damper to rotate the first target angle. Finally, it is determined whether the adjusted current drying temperature inside the dryer is within the target drying temperature range for this stage. If it is within the range, the temperature control action stops; otherwise, adjustment continues through feedback.

[0063] In one embodiment, since the drying ovens used in grain dryers on the market are coal-fired or biomass ovens, and the temperature control method they employ is often a proportional regulation method, this technology offers fast temperature adjustment but suffers from inaccurate adjustment and insufficient stability. In this embodiment, the drying temperature is primarily adjusted by the opening of the hot air damper, and dynamic control of the valve opening is achieved through a PID program. Because users lack sufficient understanding of the temperature environment characteristics of the grain dryer, the target drying temperature is a range within a certain interval. The PID instruction utilizes a dedicated automatic adjustment function under temperature conditions to achieve PID control of the grain drying temperature. The DVP04PT temperature module measures the current drying temperature of the grain dryer and transmits it to the PLC controller. The DVP32ES200R main unit first uses the automatic temperature adjustment parameter function for preliminary adjustments, automatically calculating the optimal PID temperature control parameters. After adjustment, it automatically modifies the action direction to the adjusted temperature control function and uses the automatically calculated parameters to achieve PID control of the grain drying temperature. The automatically adjusted parameters are used for PID calculation, and the output result serves as the input signal for the driver. Furthermore, based on actual needs, the motion control driver mode under the Mooddbbuuss-RTU communication protocol can be selected as either a homing mode or a position mode. The controller's PID algorithm and the driver's built-in position and homing modes are used to control the stepper motor, thereby precisely controlling the opening of the hot air damper.

[0064] The driver's return-to-zero mode includes the following steps:

[0065] 1. Enable driver operation: After the driver is powered on or reset, it is in a disabled state. Write the control word 0x000F to the driver control register to enable the device.

[0066] 2. Enable zero-return mode: Write 0x06 to object dictionary 6060h to enable zero-return mode.

[0067] 3. Set operating parameters: You need to set parameters such as homing mode (0x6098h), homing speed (0x6099h), homing acceleration / deceleration (0x609Ah), zero offset (0x607C), and zero offset speed (0x609B).

[0068] 4. Start the zero-return process: Select the zero-return mode in register 0x6098h, flip the 4th bit in the control word, and start the zero-return operation. You can check the current status by checking the status word.

[0069] 5. Zero offset: Zero offset is the offset distance between the mechanical origin and the zero point we set. The direction of the offset can be to the left or right of the mechanical origin.

[0070] The drive's position mode includes the following steps:

[0071] 1. Enable driver operation: After the driver is powered on or reset, it is in a disabled state. Write the control word 0x000F to the driver control register to enable the device.

[0072] 2. Enable Position Mode: To enable position mode, 0X01 must first be written to register 6060h. The current motion mode can be viewed from register 6061h. When one position is in operation, a new position can be set; after the current position completes its operation, the second position will start immediately.

[0073] 3. Set operating parameters: Set parameters such as target position (607Ah), speed (6081h), acceleration (6083h), and deceleration (6084h).

[0074] 4. Start / Stop Operation: After writing the above operating parameters for the desired position, set bit 4 of the control word to 1 to start the motor. During motor operation, setting bit 8 of the control word will stop the motor.

[0075] 5. Control word bits: When the status word bit12 is 1, the control word bit4 will be changed from 0 to 1 to acquire the current position value. When the status word bit12 is 0, the current position value will not be acquired.

[0076] In one embodiment, a temperature control method for multiple dryers is provided, including a PID algorithm based on a combined improvement of a heat source-driven grain dryer system. For example... Figure 6 As shown, the system's output monitoring value is provided by the drying temperature sensor (second temperature sensor), and the input value is provided by the hot air temperature sensor (first temperature sensor). The current drying temperature is used as feedback to adjust the hot air damper opening, thereby controlling the amount of hot air entering and adjusting the final output target drying temperature range. The remote terminal transmits the correspondence between the hot air temperature, drying temperature, and hot air damper opening to the cloud for recording via the EGS502-ZE remote terminal. This embodiment uses the PID algorithm tool built into the Delta PLC controller with PID instructions, and the programming software is WPLSoft. The PID instructions are:

[0077] PID S1 S2 S3 D

[0078] Where S1 is the target value (target drying temperature range), S2 is the current value (current drying temperature), and S3-S3+19 are the parameter settings for temperature regulation control. Once all parameters are set, the PID instruction is executed, and the calculation result is temporarily stored in D. The contents of D should be stored in a register without power-off hold function. S3 is the sampling time, S3+1 is the proportional gain Kp, S3+2 is the integral time KI, S3+3 is the derivative gain KD, and S3+4 is the control mode.

[0079] Driver setup and programming include the following steps:

[0080] 1. Create a new project: Click Settings → Open Delta WPLSoft Programming Software → Select the CPU model of the PLC.

[0081] 2. Configure Communication Parameters: Select Communication Settings → Select the COM port for communication → Set Communication Parameters → OK. Slave Parameters: Modbus-RTU mode, 8 data bits, 1 stop bit, no parity. The above parameters are the default for the slave and cannot be modified. The master station settings must be consistent with the slave settings; otherwise, communication will fail. The baud rate can be adjusted according to actual needs, but it must also be consistent between the master and slave stations.

[0082] 3. Explanation of MODRW S1 S2 S3 SN instructions: S1: Unit Address, specified range 0-254, 0 for broadcast mode. S2: MODBUS Function Code. Function codes: 03 for reading a register, 06 for writing a single register, 10 for writing multiple registers. S3: Device Address. Slave register address; please refer to the Chimera drive MODBUS protocol manual for details. S: Source or Destination of data to be read or written. This is a user-defined register where the desired data length is pre-stored. Alternatively, it can be the register where the data is stored after reading. n: Data Length. When using word-type communication function codes, the set data length cannot exceed 100 words.

[0083] There is no limit to the number of times this command can be used in the program. However, when different communication commands use the same communication port at the same time, only one command will be executed. In addition, when using the transmit flags of each communication port, special attention should be paid to setting them on the line before this command; otherwise, it may be easy for the independent communication data of the two communication ports to be mixed up.

[0084] When a communication timeout occurs, the timeout flag will turn ON. If the problem has been resolved, the timeout flag can be cleared to OFF. When using the MODRW command, the timeout period cannot be set to 0; it must be within the range of 100 to 32767 ms. If the timeout period is set to 0, it will execute in 200 ms increments. In Modbus-RTU mode, the user only needs to configure the data to be transmitted, and this command will automatically add a checksum (CRC). The received data is stored in S as a HEX value.

[0085] In one embodiment, a dryer 700 is provided, comprising:

[0086] Temperature control mechanism 710, which includes hot air damper 711, is used to adjust the opening degree of hot air damper 711.

[0087] The first temperature sensor 720 is used to detect the inlet temperature of the hot air damper 711;

[0088] The second temperature sensor 730 is used to detect the current drying temperature of the dryer; and

[0089] The controller 740 is configured to: determine the target drying temperature range of the object to be dried in each dryer; during the process of starting the heat source to heat multiple dryers, acquire the inlet temperature of the hot air damper of each dryer and the current drying temperature in real time; and for each dryer, control the temperature control mechanism to adjust the opening of the hot air damper of the dryer according to the current drying temperature, the target drying temperature range and the inlet temperature, so that the current drying temperature is within the target drying temperature range.

[0090] In one embodiment, the temperature control mechanism 710 further includes: a hot air damper 712 disposed on a corresponding hot air damper 711 for adjusting the opening degree of the corresponding hot air damper 711; and a plurality of cold air dampers 713, each cold air damper 713 being provided with a cold air damper 714 for adjusting the opening degree of the corresponding cold air damper 713. The controller 740 is further configured to: for each dryer, determine a first target angle for rotation of the hot air damper corresponding to the dryer based on the current drying temperature, the target drying temperature range, and the inlet temperature; for each dryer, control the hot air damper to rotate to the first target angle to adjust the opening degree of the hot air damper so that the current drying temperature is within the target drying temperature range; for each dryer, determine a second target angle for closure of each cold air damper based on the first target angle; for each dryer, control each cold air damper to rotate to the second target angle to adjust the opening degree of the corresponding cold air damper so that the pressure inside the dryer is stable.

[0091] refer to Figure 3 The temperature control mechanism includes a hot air damper 1, a hot air damper baffle 2, a cold air damper 3a, a cold air damper baffle 4a, a cold air damper 3b, and a cold air damper baffle 4b. The hot air damper baffle 2 is located in front of the hot air damper 1; the opening of the hot air damper 1 can be adjusted by rotating the hot air damper baffle 2. Cold air dampers 3a and 3b are located on either side of the hot air damper. Cold air damper 3a is equipped with a cold air damper baffle 4a, and cold air damper 3b is equipped with a cold air damper baffle 4b.

[0092] In one embodiment, the temperature control mechanism 710 further includes: a driver 715 for sending pulse information to a stepper motor; and a stepper motor 716 for driving the hot air damper to rotate based on the pulse information. (Reference) Figure 4The temperature control mechanism also includes an HMI touchscreen, a PLC controller, a driver, a moisture meter, a stepper motor, electrical protection devices, and actuators (not shown in the figure). The hot air damper is driven by a stepper motor. Stepper motors have advantages such as high control precision and ease of control. The stepper motor can receive pulse signals sent by the driver to precisely control its rotation. One pulse signal represents 0.8 degrees. The PLC controller's built-in algorithm outputs a signal value to the driver, putting the driver in position mode. The driver sends corresponding pulse signals to the stepper motor, causing the stepper motor to drive the hot air damper to rotate by a first target rotation angle, thereby adjusting the opening of the hot air damper and ensuring that the drying temperature inside the dryer is within the target drying temperature range. When the dryer finishes drying or switches to the next drying stage, the PLC controller controls the driver to enter a zero-return mode, controlling the stepper motor to stop at the zero position, thus stopping the rotation of the hot air damper.

[0093] In one embodiment, the dryer 700 further includes: a human-machine interface device 750 for acquiring information on the object to be dried input by a user, the information on the object to be dried including at least one of temperature, operating area, moisture content, and type; and / or the human-machine interface device 750 for acquiring a temperature range for each dryer input by a user; the controller 740 is further configured to use the temperature range input by the user as the target drying temperature range for the object to be dried in the corresponding dryer.

[0094] The human-machine interface device can specifically be an HMI touchscreen. Users can obtain information such as the temperature, operating area, moisture content, and type of the object to be dried through the touchscreen, and then determine the target drying temperature range based on this information. Alternatively, the touchscreen can directly obtain the temperature range input by the user for each dryer, which can then be used as the target drying temperature range for the objects to be dried within each dryer.

[0095] In one embodiment, such as Figure 8 As shown, a temperature control system for multiple dryers is provided, comprising:

[0096] Heat source 810 provides hot air to the dryer;

[0097] At least one of the aforementioned dryers 700, each dryer including a temperature control mechanism, including a hot air damper, the temperature control mechanism being used to adjust the opening degree of the hot air damper; a first temperature sensor for detecting the inlet temperature of the hot air damper; a second temperature sensor for detecting the current drying temperature of the dryer; and a controller configured to perform the aforementioned temperature control method for multiple dryers.

[0098] In one embodiment, such as Figure 9 As shown, another temperature control system for multiple dryers is provided, comprising:

[0099] Heat source 910 provides hot air to the dryer;

[0100] At least one dryer 920, each dryer including a hot air damper, a first temperature sensor, and a second temperature sensor, the first temperature sensor being used to detect the inlet temperature of the corresponding hot air damper, and the second temperature sensor being used to detect the current drying temperature of the corresponding dryer; and

[0101] The controller 930 is configured to: determine the target drying temperature range of the object to be dried in each dryer; during the process of starting the heat source to provide hot air to multiple dryers, acquire in real time the inlet temperature of the hot air damper of each dryer and the current drying temperature; and for each dryer, control the temperature control mechanism to adjust the opening of the hot air damper of the dryer according to the current drying temperature, the target drying temperature range and the inlet temperature, so that the current drying temperature is within the target drying temperature range.

[0102] In one embodiment, the dryer 920 further includes: a hot air damper baffle, disposed on the hot air damper, for adjusting the opening degree of the hot air damper; multiple cold air dampers, each cold air damper having a cold air damper baffle, for adjusting the opening degree of the corresponding cold air damper; a driver for sending pulse information to a stepper motor; the stepper motor for driving the hot air damper baffle to rotate based on the pulse information; a human-machine interface device for acquiring information about the object to be dried input by the user for the dryer, the information about the object to be dried including at least one of temperature, operating area, moisture content, and type; and / or the human-machine interface device for acquiring a temperature range for the dryer input by the user; the controller 940 is further configured to use the temperature range input by the user as the target drying temperature range for the corresponding object to be dried in the dryer.

[0103] refer to Figure 10In one embodiment, each dryer has an electrical control system, which includes a control unit, an electrical execution module, an electric grain feeding module, a touchscreen HMI, a remote terminal module, and a digital information acquisition module. The dryer control unit includes an I / O input / output module for the PLC controller and a temperature analog signal acquisition module. This control unit processes not only input switch signals but also corresponding analog and digital signals. It also interacts with other modules for information exchange, control, and monitoring. In this embodiment, a resistance temperature detector (RTD) sensor is used; therefore, the selected temperature analog signal acquisition module is the DVP04PT. This module collects hot air temperature, drying temperature, and grain temperature and uploads them to the main control unit for information processing. The digital information acquisition module transmits the moisture value collected by the Shizuoka moisture meter to the PLC main control unit via RS-485 communication, and then to the HMI. The electrical execution module mainly includes an AC contactor, a thermal overload relay, and an intermediate relay. The output signal from the controller is transmitted to the ventilation motor, elevator, upper and lower auger motors, and swivel motor via the protection provided by the intermediate relay, AC contactor, and thermal overload relay. The remote terminal module can upload data such as the grain dryer's operating time, hot air temperature, drying temperature, operating area, moisture content, grain temperature, and grain type to the Internet of Things (IoT) for remote data recording and monitoring. The touchscreen HMI module can interact with the controller via RS232 communication, allowing users to manually and automatically control various functions of the grain dryer and monitor its operating data. The electric grain feeding module consists of an electric push rod and two intermediate relays, controlled by pressing buttons on the touchscreen. The single temperature control mechanism module comprises an HMI touchscreen, a PLC controller, a driver, a stepper motor, and a hot air damper. The PLC controller collects data on hot air temperature, drying temperature, moisture content, and grain temperature to determine the drying stage of the grain. It then uses a built-in algorithm to send output commands to the driver, which in turn sends pulses to the stepper motor, precisely controlling the opening of the hot air damper. The hot air sensor and temperature sensor used in this example are both PT100 RTD type temperature sensors with a 6-meter long heat-resistant shielded cable, a 6mm diameter probe, and a 500mm probe length. The grain temperature sensor is a PT100 RTD type temperature sensor with a 3-meter long heat-resistant shielded cable, a 12mm diameter probe, and a 100mm probe length. The PLC main controller is a Delta DVP32ES2 controller with 16 inputs and 16 outputs, featuring relay outputs. This controller provides stable outputs and meets the input / output requirements of both DC 24V and AC 220V, making it widely applicable. The controller has two RS485 interfaces and one RS232 interface to facilitate communication with the driver, moisture meter, touchscreen, and remote terminal.The temperature acquisition module is a Delta DVP04PT module, which has four PT100 RTD signal input channels. The input signal is a 4mA-20mA current signal, offering advantages such as fast signal transmission and signal stability. The driver in the single temperature control mechanism is a 2PH880-RC, which is communicative and has four modes: homing mode, speed mode, position mode, and data query mode. The stepper motor is a P86H18156-460-NJ with a power of 400W, which receives pulses from the driver to precisely control the opening of the hot air damper. In this example, the thermal overload relay used in the electrical actuator is a Schneider LRN08N(D3N), with a set current of 8A. When the motor is overloaded, the thermal overload relay will disconnect, thereby cutting off the current to protect the motor. The intermediate relay uses a Schneider RXM2LB2BD+RXZE1M2C (24V) with a base. The relay's coil voltage is 24V, allowing for the switching of 220V high-voltage components via 24V low-voltage control. The AC contactor is an LC1N1810M5N, which can directly control the motor current. The touchscreen HMI is the human-machine interface, featuring automatic grain feeding, automatic drying, automatic ventilation, automatic grain discharge, manual operation, parameter setting, alarm history, intelligent temperature control, electric grain discharge, and automatic moisture meter interfaces. RS232 communication establishes a connection between the touchscreen and the controller, linking the touchscreen's function keys to the PLC controller's registers, enabling control of various grain dryer functions via the touchscreen.

[0104] The above technical solution generates hot air through a heat source and then precisely controls the temperature of each dryer based on the required drying temperature of the object to be dried, the temperature after heat loss, and the current drying temperature, avoiding temperature drops within the hot air duct. This fully utilizes thermal energy, enabling a drying method where one heat source corresponds to multiple dryers, and avoids excessively frequent damper operation due to temperature adjustments. The controller employs a PID algorithm and the driver's built-in position and homing modes to control the stepper motor, thereby precisely controlling the hot air damper opening. A communicable driver is used to drive the stepper motor, overcoming the limitation of PLCs requiring transistor-type components. Drying data—grain temperature, drying temperature, hot air temperature, grain moisture content, drying time, and hot air damper opening—is uploaded to the cloud via a GPS terminal for visualized monitoring. This enables remote monitoring, control, and data analysis of the grain dryer. The temperature control method provided in this application has wide applicability, suitable for both one-to-one heat source grain drying and one-to-many heat source drying methods.

[0105] Figure 2This is a schematic flowchart illustrating a temperature control method for multiple dryers in one embodiment. It should be understood that, although... Figure 2 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 2 At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0106] The controller contains a kernel that retrieves the corresponding program units from memory. One or more kernels can be configured, and temperature control methods for multiple dryers can be implemented by adjusting kernel parameters.

[0107] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0108] This application provides a storage medium storing a program that, when executed by a controller, implements the temperature control method described above for multiple dryers.

[0109] This application provides a controller for running a program, wherein the program executes the temperature control method described above for multiple dryers.

[0110] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 11As shown. The computer device includes a controller A01, a network interface A02, a memory (not shown), and a database (not shown) connected via a system bus. The controller A01 provides computing and control capabilities. The memory includes internal memory A03 and a non-volatile storage medium A04. The non-volatile storage medium A04 stores an operating system B01, a computer program B02, and a database (not shown). The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 stored in the non-volatile storage medium A04. The database stores data for temperature control methods for multiple dryers. The network interface A02 communicates with external terminals via a network connection. When the computer program B02 is executed by the controller A01, it implements a temperature control method for multiple dryers.

[0111] Those skilled in the art will understand that Figure 11 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0112] This application provides an apparatus including a controller, a memory, and a program stored in the memory and executable on the controller. When the controller executes the program, it implements the steps of the temperature control method for multiple dryers described above.

[0113] This application also provides a computer program product that, when executed on a data processing device, is adapted to execute a program that initializes the above-described temperature control method steps for multiple dryers.

[0114] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0115] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a controller of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the controller of the computer or other programmable data processing apparatus, generate instructions for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0116] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0117] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0118] In a typical configuration, a computing device includes one or more controllers (CPUs), input / output interfaces, network interfaces, and memory.

[0119] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0120] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0121] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0122] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A temperature control method for multiple dryers, characterized in that, Each dryer includes a temperature control mechanism, and each temperature control mechanism includes a hot air damper, a hot air damper baffle disposed on the hot air damper, multiple cold air dampers, and a cold air damper baffle corresponding to each cold air damper. The multiple dryers use the same heat source, and the temperature control method includes: Determine the target drying temperature range for the objects to be dried in each dryer; During the process of starting the heat source to provide hot air to the multiple dryers, the inlet temperature of the hot air damper of each dryer and the current drying temperature are acquired in real time. For each dryer, the opening of the hot air damper of the dryer is adjusted by the temperature control mechanism according to the current drying temperature, the target drying temperature range and the air inlet temperature, so that the current drying temperature is within the target drying temperature range; Specifically, for each dryer, controlling the opening of the hot air damper of the dryer by the temperature control mechanism based on the current drying temperature, the target drying temperature range, and the inlet air temperature, so that the current drying temperature is within the target drying temperature range, includes: For each dryer, a first target angle for the rotation of the hot air damper corresponding to the dryer is determined based on the current drying temperature, the target drying temperature range, and the air inlet temperature. For each dryer, the hot air damper is rotated to the first target angle to adjust the opening of the hot air damper so that the current drying temperature is within the target drying temperature range; The temperature control method further includes: For each dryer, determine the second target angle at which each cold air damper needs to be closed based on the first target angle; For each dryer, the second target angle is rotated to control each cold air damper baffle to adjust the opening of the corresponding cold air damper so as to stabilize the pressure inside the dryer.

2. The temperature control method for multiple dryers according to claim 1, characterized in that, The temperature control mechanism of each dryer also includes a driver and a stepper motor. The driver includes a position mode. For each dryer, controlling the hot air damper to rotate to the first target angle and adjusting the opening of the hot air damper includes: For each dryer, the driver sends a corresponding pulse to the stepper motor according to the first target angle, so that the stepper motor drives the hot air damper to rotate to the first target angle, thereby adjusting the opening of the hot air damper.

3. The temperature control method for multiple dryers according to claim 2, characterized in that, The driver includes a zero-return mode, and the temperature control method further includes: For each dryer, when the dryer finishes drying or switches to the next drying stage, the control driver enters the zero-return mode to control the stepper motor to stop at the zero position, so that the hot air damper stops rotating.

4. The temperature control method for multiple dryers according to claim 1, characterized in that, The determination of the target drying temperature range for the objects to be dried in each dryer includes: For each dryer, information about the object to be dried is obtained. This information includes at least one of the following: temperature, operating location, moisture content, and type. For each dryer, determine the target drying temperature range for the object to be dried based on the information of the object to be dried; and / or Obtain the temperature range input by the user for each dryer as the target drying temperature range for the objects to be dried in each dryer.

5. A controller, characterized in that, It is configured to perform the temperature control method for multiple dryers according to any one of claims 1 to 4.

6. A dryer, characterized in that, include: A temperature control mechanism includes a hot air damper, the temperature control mechanism being used to adjust the opening degree of the hot air damper; The first temperature sensor is used to detect the inlet temperature of the hot air damper; A second temperature sensor is used to detect the current drying temperature of the dryer; and The controller as described in claim 5.

7. The dryer according to claim 6, characterized in that, The temperature control mechanism of the dryer also includes: A hot air damper baffle is provided on the hot air damper for adjusting the opening degree of the hot air damper; Multiple cold air dampers, each equipped with a cold air damper baffle, are used to adjust the opening degree of the corresponding cold air damper.

8. The dryer according to claim 7, characterized in that, The temperature control mechanism of the dryer also includes: A driver, used to send pulse information to a stepper motor; A stepper motor is used to drive the hot air damper to rotate based on the pulse information.

9. The dryer according to claim 6, characterized in that, The dryer also includes: Human-computer interaction device for acquiring information about the object to be dried input by the user for the dryer, the information including at least one of temperature, operating area, moisture content, and type; and / or The human-computer interaction device is used to obtain the temperature range for the dryer input by the user; The controller is also used to use the temperature range input by the user as the target drying temperature range for the object to be dried in the corresponding dryer.

10. A temperature control system for multiple dryers, characterized in that, The temperature control system includes: The heat source provides heat to the dryer; At least one dryer as described in claim 6.

11. A temperature control system for multiple dryers, characterized in that, The temperature control system includes: The heat source provides heat to the dryer; At least one dryer, each dryer including a hot air damper, a first temperature sensor, and a second temperature sensor, the first temperature sensor being used to detect the inlet temperature of the corresponding hot air damper, and the second temperature sensor being used to detect the current drying temperature of the corresponding dryer; and The controller as described in claim 5.

12. A machine-readable storage medium storing instructions thereon, characterized in that, When executed by the controller, the instruction causes the controller to be configured to perform the temperature control method for multiple dryers according to any one of claims 1 to 4.

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