Drying system

Abstract

The invention provides a drying system, which relates to the technical field of drying equipment, and comprises a cavity for placing a sample to be treated; the heater is used for supplying heat to the cavity; the monitoring module is used for monitoring the temperature in the cavity in real time and acquiring a real-time temperature signal; the control module is used for acquiring a target temperature signal and the real-time temperature signal so as to dynamically control the heater; and the control module compares the real-time temperature signal with the target temperature signal so as to dynamically output a control signal, the output power of the heater is adjusted, and the problems that the temperature of an existing drying system is inconvenient to adjust, and the working efficiency is affected are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of drying equipment, and in particular to a drying system. Background Art

[0002] Heating furnaces are widely used in industrial production and scientific research. Since such objects are easy to use and can control temperature by adjusting output power, thus obtaining better control performance, they are widely used in metallurgy, machinery, chemical industry and other fields. In some industrial process control, industrial heating furnaces are key components, and furnace temperature control accuracy and working stability have become the decisive factors for product quality.

[0003] However, the existing heating furnace uses a radiation heat exchanger, and its temperature regulation is relatively difficult, because its heating method is heating through electric current, and the strength of the current cannot directly control the temperature, and the heat dissipation method of the radiation heat exchanger is radiation, so the temperature changes relatively slowly. When the target temperature needs to be reached, it cannot be adjusted quickly, and the working efficiency is low. Summary of the invention

[0004] In order to overcome the above technical defects, the purpose of the present invention is to provide a drying system to solve the problem that the temperature adjustment of the existing drying system is inconvenient and affects the work efficiency.

[0005] The invention discloses a drying system, comprising:

[0006] a cavity, for placing the sample to be processed;

[0007] A heater for providing heat to the cavity;

[0008] A monitoring module, for monitoring the temperature in the cavity in real time and obtaining a real-time temperature signal;

[0009] A control module, acquiring a target temperature signal and the real-time temperature signal to dynamically control the heater;

[0010] The control module compares the real-time temperature signal with the target temperature signal to dynamically output a control signal to adjust the output power of the heater.

[0011] Preferably, the control module comprises:

[0012] A controller, comparing the real-time temperature signal with the target temperature signal, and outputting a control signal;

[0013] A power regulator adjusts the output power of the heater according to the control signal.

[0014] Preferably, the controller comprises a PID controller.

[0015] Preferably, the controller calculates a proportional control signal, an integral control signal and a differential control signal respectively, and weights and calculates the control signals.

[0016] Preferably, the controller calculates the control signal according to the following formula:

[0017] Among them, K p is the proportional gain determined according to the proportional control signal; T t is the integral time constant determined according to the integral control signal; T D is the differential time constant determined according to the differential control signal; e(t) is the difference between the real-time temperature signal and the target temperature signal.

[0018] Preferably, it also includes:

[0019] An interactive device communicates with the control module to input a target temperature signal and / or perform real-time monitoring.

[0020] Preferably, the interactive device includes a touch screen, a keyboard and a display screen.

[0021] Preferably, a preset program is run on the interactive device to autonomously and dynamically control the control module and the heater.

[0022] Preferably, the monitoring module includes a thermocouple sensor, a thermistor sensor or an infrared sensor.

[0023] Preferably, the heater includes a resistance heater, an electromagnetic induction heater and a radiation heater.

[0024] Compared with the prior art, the above technical solution has the following beneficial effects:

[0025] The drying system provided by the present invention is based on single-loop control. The cavity is heated by a heater. The monitoring module obtains a real-time temperature signal and feeds it back to the control module. Under the control module, a control signal is output to dynamically adjust the output power of the heater based on the comparison between the real-time temperature signal and the target temperature signal, thereby realizing real-time control of the temperature in the cavity and solving the problem that the temperature adjustment of the existing drying system is difficult and affects the work efficiency. Furthermore, through PID control, various disturbances in the working process of the control system can be greatly eliminated, thereby improving the stability of the system output. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a module of a drying system embodiment of the present invention;

[0027] Figure 2 It is a schematic diagram showing a control process in an embodiment of a drying system described in the present invention.

[0028] Reference numerals:

[0029] 1- cavity; 2- heater; 3- monitoring module; 4- control module; 41- controller; 42- power regulator; 5- interactive device. DETAILED DESCRIPTION

[0030] The advantages of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0032] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0033] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0035] In the following description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present invention, and have no specific meanings. Therefore, "module" and "component" can be used interchangeably.

[0036] Embodiment: This embodiment discloses a drying system, which is a design of a temperature control system of a cavity based on a single-loop control system, to achieve rapid and accurate temperature control, thereby improving the stability of the system output temperature. Furthermore, combined with PID control, various disturbances in the working process of the control system can be greatly eliminated, so that the system works in a good state and achieves a better control effect. For details, refer to Figure 1-Figure 2 , the drying system includes:

[0037] The cavity is used to place the sample to be processed. The specific shape and space size can be set according to the actual application scenario. Further, partitions can be set to improve the wide application range.

[0038] The heater provides heat to the cavity. As an option, the heater includes but is not limited to a resistance heater, an electromagnetic induction heater, and a radiation heater, etc., and can also be set to multiple, so as to achieve the heating of the cavity and be responsible for providing the energy required by the heating furnace. Furthermore, according to the control signal sent by the following controller, the device can adjust the heating power to achieve the required temperature and realize rapid temperature control;

[0039] Monitoring module, specifically a temperature control transmitter ( Figure 2 ), real-time monitoring of the temperature in the cavity, obtaining real-time temperature signals, the temperature control transmitter is a device that converts the signal of the temperature sensor into a standardized signal output. It is mainly used for the measurement and control of temperature parameters in industrial processes, and can convert temperature variables into transmittable standardized output signals, such as 4-20mA current signals or 0-5V / 0-10V voltage signals, or even RS485 digital signal outputs. These standardized signals can be easily connected to various control systems, data acquisition systems, and monitoring equipment to achieve remote monitoring and control. The working principle of the temperature control transmitter is usually based on thermocouples or thermal resistor sensors. Therefore, as an option, the monitoring module includes but is not limited to thermocouple sensors, thermal resistor sensors, or infrared sensors. In order to improve the accuracy of the monitoring results, multiple sensors can also be arranged. The sensors convert the measured temperature values ​​into electrical signals for use by the following controllers. It can also be understood that the temperature control transmitter can also apply different wiring methods such as two-wire, three-wire, and four-wire systems according to its power supply and signal transmission methods to adapt to different application scenarios and needs.

[0040] A control module is used to obtain a target temperature signal and the real-time temperature signal to dynamically control the heater; in this embodiment, the control module compares the real-time temperature signal with the target temperature signal (see Figure 2The control module is the core part, which is responsible for, but not limited to, measuring, comparing and controlling the temperature of the cavity. Therefore, the control module establishes mutual communication with the above-mentioned heater, monitoring module, etc.

[0041] In this embodiment, the control module can apply a variety of temperature control strategies, including but not limited to Bang-Bang control, fuzzy logic control, adaptive control, etc. In this embodiment, PID control logic is integrated. Specifically, in this embodiment, the control module includes: a controller ( Figure 2 The temperature controller in the monitoring module compares the real-time temperature signal with the target temperature signal and outputs a control signal; the power regulator adjusts the output power of the heater according to the control signal. The controller receives the real-time temperature signal from the monitoring module and compares it with the set target temperature. The control signal is sent out according to the comparison result, so that the power regulator controls the output power of the heater, thereby realizing the temperature control of the cavity temperature.

[0042] It is understandable that a power regulator is a device used to adjust the load power. Its core component is usually a thyristor, which can adjust the voltage, current and power applied to the AC load in conjunction with the corresponding trigger control circuit. By controlling the conduction angle of the thyristor (i.e. the trigger end), the average voltage and current on the load can be adjusted, thereby achieving load power regulation. It has strong adaptability and a small size, reducing the complexity of the layout of the entire system.

[0043] In this embodiment, the controller includes a PID controller, and the PID controller control process includes proportional (P) control: when the measured temperature is lower than the set point, the controller outputs a signal to increase the output power of the power regulator. Adjustment of the proportional gain affects the speed at which the temperature returns to the set point. Integral (I) control: if there is a steady-state error, that is, the temperature continues to deviate from the set point, the integral action will accumulate the error and increase the control action to eliminate this error. Derivative (D) control: The derivative action predicts the trend of temperature change and adjusts the response of the actuator in advance to reduce overshoot and oscillation of the system.

[0044] In this embodiment, as an example, assuming that the internal temperature of the oven needs to be controlled at 100°C, the PID controller needs to perform the following: Proportional control (P): If the current temperature is 20 degrees Celsius, which is lower than the set temperature of 100 degrees Celsius, the proportional control will generate a control amount according to the temperature difference. For example, if the proportional coefficient is 5, then a temperature difference of 5 degrees will generate a control amount of 25, which may increase the power of the heating device. The advantage of proportional control is that it reacts quickly and can respond immediately to deviations, but using it alone may cause steady-state errors in the system. Integral control (I): As time goes by, if the temperature has not reached the set value, the integral control will take effect. The integral term will accumulate errors, and even if the temperature deviation is small, it will produce a larger control effect after a period of accumulation. For example, if the temperature deviation is 1 degree per second and the integral coefficient is 2, after 10 seconds of accumulation, the integral term will generate a control amount of 20, further increasing the power of the heating device to eliminate the steady-state error. Derivative control (D): When the temperature approaches the set value, the differential term will adjust the control amount according to the rate of temperature change. If the temperature rises too quickly, the differential control will generate a negative control amount to reduce the power of the heating equipment to prevent the temperature from rising too much and exceeding the set value. For example, if the temperature rise rate is 2 degrees per second and the differential coefficient is 3, a control amount of -6 will be generated to reduce the heating power.

[0045] In this embodiment, it can be understood that, during PID control, proportional control, integral control and differential control are performed simultaneously, and by adjusting the parameters of each control of the PID controller, the performance of the system can be optimized, such as reducing overshoot, accelerating response speed or improving stability, etc. Therefore, in this embodiment, the controller calculates the proportional control signal, the integral control signal and the differential control signal respectively, and weights and calculates the control signals.

[0046] Specifically, the controller calculates the control signal by weighted sum according to the following formula:

[0047] Among them, K p is the proportional gain determined according to the proportional control signal; T t is the integral time constant determined according to the integral control signal; T D is the differential time constant determined according to the differential control signal; e(t) is the difference between the real-time temperature signal and the target temperature signal; u(t) is the control signal.

[0048] In this embodiment, based on the above, the real-time temperature signal obtained by the monitoring module is compared with the set target temperature signal, so that the controller controls the output power of the heater, thereby achieving fast and accurate temperature control. It can be understood that the target temperature can be preset before the system is used, and the target temperature can be adjusted during the use of the system, and dynamic control can be performed during the drying process.

[0049] In order to achieve the control of the target temperature signal, in a preferred embodiment, the drying system further includes: an interactive device, which may also be an interface device, which communicates with the control module to input the target temperature signal and / or perform real-time monitoring. A human-machine interface may be set for interaction, so as to facilitate the operator to set and monitor the control system of the cavity. Specifically, the interactive device may include but is not limited to a touch screen (such as Figure 2 touch screen controller), keyboard and display, etc.

[0050] In this embodiment, the interactive device receives user operations to determine the target temperature signal, and can also obtain data of the control module through user clicks to select visual display. Furthermore, a preset program can be run on the interactive device to autonomously and dynamically control the control module and heater. That is, the interactive device runs a preset program through the server to automatically trigger instructions (such as timing or realizing a certain function) to autonomously send target temperature signals or visual display / adjustment instructions, thereby realizing automatic control of the system and improving the working efficiency of the drying system.

[0051] Based on the above, the drying system provided in this embodiment is based on single-loop control, heats the cavity through a heater, monitors the real-time temperature in the cavity through a monitoring module, and feeds back to the control module. Under the control module, based on the comparison between the real-time temperature and the target temperature, a control signal is output to dynamically adjust the output power of the heater, thereby achieving real-time control of the temperature in the cavity. Furthermore, through PID control, various disturbances in the working process of the control system can be greatly eliminated, the stability of the system output can be improved, and the working effect of the system can be improved.

[0052] In addition, in addition to the above-mentioned monitoring module, control module and interactive device, the drying system provided in this embodiment can also connect / add other existing devices to realize other functions in the drying process, which can be based on actual scenarios, including but not limited to heat dissipation, transmission, etc., to improve the breadth of scenario application.

[0053] It should be noted that the embodiments of the present invention have better practicability and do not impose any form of limitation on the present invention. Any technician familiar with the field may use the technical content disclosed above to change or modify it into an equivalent effective embodiment. However, any modification or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A drying system, characterized in that: include: a cavity, for placing the sample to be processed; A heater for providing heat to the cavity; A monitoring module, for monitoring the temperature in the cavity in real time and obtaining a real-time temperature signal; A control module, acquiring a target temperature signal and the real-time temperature signal to dynamically control the heater; The control module compares the real-time temperature signal with the target temperature signal to dynamically output a control signal to adjust the output power of the heater.

2. The drying system according to claim 1, characterized in that: The control module comprises: A controller, comparing the real-time temperature signal with the target temperature signal, and outputting a control signal; A power regulator adjusts the output power of the heater according to the control signal.

3. The drying system according to claim 2, characterized in that: The controller includes a PID controller.

4. The drying system according to claim 3, characterized in that: The controller calculates a proportional control signal, an integral control signal, and a differential control signal respectively, and performs weighted sum calculation of the control signals.

5. The drying system according to claim 4, characterized in that: The controller calculates the control signal according to the following formula: Among them, K p is the proportional gain determined according to the proportional control signal; T t is the integral time constant determined according to the integral control signal; T D is the differential time constant determined according to the differential control signal; e(t) is the difference between the real-time temperature signal and the target temperature signal.

6. The drying system according to claim 1, characterized in that: Also includes: An interactive device communicates with the control module to input a target temperature signal and / or perform real-time monitoring.

7. The drying system according to claim 6, characterized in that: The interactive device includes a touch screen, a keyboard and a display screen.

8. The drying system according to claim 6, characterized in that: A preset program is run on the interactive device to autonomously and dynamically control the control module and the heater.

9. The drying system according to claim 1, characterized in that: The monitoring module includes a thermocouple sensor, a thermal resistor sensor or an infrared sensor.

10. The drying system according to claim 1, characterized in that: The heaters include resistance heaters, electromagnetic induction heaters and radiation heaters.

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