Temperature control system and heating system for an annealing process

Abstract

This utility model relates to the field of annealing technology and discloses a temperature control system and heating system for the annealing process, including: a heating power supply, a temperature acquisition module, and a control module. The control module includes a PLC controller, an input / output module, and an opto-isolation module. The PLC controller incorporates a mature temperature control method, deeply integrating the dynamic response (millisecond level) of the heating power supply with the PLC's logic control and PID regulation, overcoming the lag of traditional open-loop control or manual adjustment. The opto-isolation module blocks high-voltage interference, solving the problem of temperature control deviation caused by interference in traditional annealing processes.

Description

Technical Field

[0001] This utility model relates to the field of annealing technology, specifically to a temperature control system and heating system for the annealing process. Background Technology

[0002] In the metal processing, annealing is a crucial step in improving material properties and eliminating internal stress. Especially when involving localized or overall heat treatment operations, precise temperature control directly determines the final quality of the workpiece. Currently, the industry commonly uses temperature gauges or simple closed-loop control systems to regulate the temperature during annealing. However, these traditional control methods have significant drawbacks. On the one hand, their dynamic response speed is slow, making it difficult to adapt to the complex and ever-changing heat load demands during annealing in real time. On the other hand, the system has weak anti-interference capabilities; external environmental factors (such as power grid voltage fluctuations and electromagnetic interference) can easily lead to inaccurate temperature control, resulting in uneven workpiece performance or even scrapping. Utility Model Content

[0003] In view of this, the present invention provides a temperature control system and a heating system for the annealing process to solve the problem of how to improve temperature control accuracy.

[0004] In a first aspect, this utility model provides a temperature control system for an annealing process, comprising: a heating power supply, a temperature acquisition module, and a control module. The control module includes a PLC controller, an input / output module, and an opto-isolation module. The temperature acquisition module is connected to a power supply voltage at its power supply terminal and is used to acquire the temperature of the annealed workpiece. The heating power supply is connected to AC power at its power supply terminal, and its input terminal is connected to the output terminal of the opto-isolation module. The output terminal of the heating power supply is connected to a heater. The heater is used to heat the annealed workpiece. The PLC controller is connected to a power supply voltage at its power supply terminal, and its input terminal is connected to the output terminal of the temperature acquisition module. The output terminal of the PLC controller is connected to the input terminal of the input / output module. The output terminal of the input / output module is connected to the input terminal of the opto-isolation module. The opto-isolation module is connected to a power supply voltage at its power supply terminal, and its output terminal is connected to the input terminal of the heating power supply.

[0005] In this invention, the control module incorporates a mature temperature control method, deeply integrating the dynamic response (millisecond level) of the heating power supply with the logic control and PID regulation of the PLC, overcoming the lag of traditional open-loop control or manual adjustment. By using an opto-isolation module to block high-voltage interference, the problem of temperature control deviation caused by interference during traditional annealing processes is solved.

[0006] In one alternative implementation, the heating power source is a variable frequency heating power source.

[0007] In one optional embodiment, the heating power supply includes: a rectifier circuit, a filter circuit, an inverter circuit, and a rectifier control circuit. The DC side of the rectifier circuit is connected to AC power, the AC side of the rectifier circuit is connected to the DC side of the inverter circuit through the filter circuit, and the control terminal of the rectifier circuit is connected to the output terminal of the rectifier control circuit. The AC side of the inverter circuit is connected to the heater, and the input terminal of the rectifier control circuit is connected to the output terminal of the control module.

[0008] In one alternative implementation, the temperature acquisition module includes a dual-color infrared thermometer.

[0009] In one optional implementation, the control module includes: a PLC controller, an input / output module, and an opto-isolation module. The power supply terminal of the PLC controller is connected to a power supply voltage; the input terminal of the PLC controller is connected to the output terminal of the temperature acquisition module; the output terminal of the PLC controller is connected to the input terminal of the input / output module; the output terminal of the input / output module is connected to the input terminal of the opto-isolation module; the power supply terminal of the opto-isolation module is connected to a power supply voltage; and the output terminal of the opto-isolation module is connected to the input terminal of the heating power supply.

[0010] In one optional implementation, the control module further includes a serial communication module, wherein the input terminal of the PLC controller is connected to the output terminal of the temperature acquisition module through the serial communication module.

[0011] In one optional embodiment, the temperature control system for the annealing process further includes a power supply, wherein the input terminal of the power supply is connected to AC power, and the output terminal of the power supply is connected to the power supply terminal of the temperature acquisition module and the power supply terminal of the control module.

[0012] In one alternative embodiment, the temperature control system for the annealing process further includes a first control switch, wherein the first control switch is connected between the power supply and the input terminal of the AC power.

[0013] In one alternative embodiment, the temperature control system for the annealing process further includes a second control switch, wherein the second control switch is connected between the heating power supply and the AC power supply.

[0014] In one alternative implementation, the temperature control system for the annealing process further includes a human-machine interface module, wherein the human-machine interface module is connected to the control module.

[0015] Secondly, this utility model provides a heating system, including: a temperature control system and a heater for the annealing process of the first aspect and any optional embodiment thereof. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a composition diagram of the temperature control system according to an embodiment of the present utility model;

[0018] Figure 2 This is a composition diagram of another temperature control system according to an embodiment of the present utility model;

[0019] Figure 3 This is a composition diagram of another temperature control system according to an embodiment of the present utility model;

[0020] Figure 4 This is a composition diagram of another temperature control system according to an embodiment of the present utility model;

[0021] Figure 5 This is a composition diagram of another temperature control system according to an embodiment of the present utility model;

[0022] Figures 6(a) to 6(d) This is a detailed circuit diagram of the temperature control system according to an embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] This embodiment provides a temperature control system for the annealing process. This system consists of multiple functional modules operating collaboratively, designed to precisely regulate temperature changes during the annealing process to meet the stringent requirements of the workpiece annealing process. Figure 1 As shown, the temperature control system includes: a heating power supply, a temperature acquisition module, and a control module.

[0025] like Figure 1 As shown, the power supply terminal of the temperature acquisition module is connected to the power supply voltage, and the temperature acquisition module is used to acquire the temperature of the annealed workpiece.

[0026] Specifically, the temperature acquisition module integrates a high-precision temperature sensor, which can quickly and accurately acquire the real-time temperature of the annealed workpiece.

[0027] Optionally, this module employs advanced signal processing technology to amplify, filter, and convert the acquired temperature signal to analog-to-digital conversion, ensuring stable and reliable output temperature data and providing accurate data for subsequent temperature control. Simultaneously, the temperature acquisition module possesses strong anti-interference capabilities, enabling stable operation in complex industrial environments and preventing data deviations caused by external electromagnetic interference or other factors.

[0028] like Figure 1 As shown, the power supply terminal of the heating power supply is connected to AC power, the input terminal of the heating power supply is connected to the output terminal of the control module, and the output terminal of the heating power supply is connected to the heater.

[0029] Specifically, the power supply terminal of the heating power supply is connected to standard AC power, serving as the core of the energy supply for the entire heating system. Its input terminal is connected to the output terminal of the control module via a dedicated electrical connection cable. This connection method ensures rapid transmission and stable reception of control signals, guaranteeing that the heating power supply adjusts its output power in a timely manner according to control commands. The output terminal of the heating power supply is closely connected to the heater. Based on the commands from the control module, it converts the input AC power into a form of electrical energy suitable for the heater's operation and provides stable and controllable electrical energy to the heater through precise power regulation, thereby achieving effective control of the heating power for the annealed workpiece. The heating power supply has overcurrent and overvoltage protection functions, automatically cutting off the power supply in abnormal situations to ensure safe system operation.

[0030] like Figure 1 As shown, the heater is used to heat the annealed workpiece.

[0031] Specifically, the heater, as a device that directly provides heat to the annealed workpiece, can efficiently convert electrical energy into heat energy and uniformly transfer it to the annealed workpiece through scientific structural design and material selection. The heating elements used have excellent thermal conductivity and high-temperature resistance, maintaining a stable heating effect during long-term operation. Furthermore, the heating zone of the heater can be customized according to the shape and size of the annealed workpiece, ensuring uniform heating of all parts of the workpiece and meeting the annealing process requirements of different workpieces.

[0032] like Figure 1 As shown, the power supply terminal of the control module is connected to the power supply voltage, and the input terminal of the control module is connected to the output terminal of the temperature acquisition module.

[0033] Specifically, the control module is also connected to a stable power supply voltage and internally incorporates a high-performance microprocessor and dedicated control algorithms. The input of the control module is connected to the output of the temperature acquisition module via a data transmission line, enabling it to receive real-time temperature data of the annealed workpiece from the temperature acquisition module. The control module analyzes and processes the acquired annealed workpiece temperature data, calculates the required heating power using its internal control algorithm, and outputs a control signal to the heating power supply.

[0034] Optionally, the control module controls the output power of the heating power supply by controlling the voltage reference value of the closed-loop control loop of the heating power supply based on the annealed workpiece temperature data. For example, the control module performs in-depth analysis and processing of the collected temperature data according to a preset annealing process curve, calculating the deviation between the current temperature and the target temperature. Based on this deviation value, and combined with an advanced PID (Proportional-Integral-Derivative) control algorithm, the control module generates a corresponding adjustment command. Subsequently, the control module converts this adjustment command into a voltage reference value adjustment signal for the closed-loop control loop of the heating power supply and sends it to the closed-loop control system of the heating power supply. Upon receiving the voltage reference value adjustment signal, the closed-loop control system immediately and precisely adjusts the input voltage of the heating power supply, controlling the output power of the heating power supply by changing the voltage magnitude. This achieves precise control of the annealed workpiece temperature, ensuring that the annealing process strictly follows the predetermined process requirements and guaranteeing the quality and performance of the annealed workpiece.

[0035] In some alternative implementations, such as Figure 2 As shown, the heating power supply includes: a rectifier circuit, a filter circuit, an inverter circuit, and a rectifier control circuit.

[0036] like Figure 2 As shown, the DC side of the rectifier circuit is connected to AC power, the AC side of the rectifier circuit is connected to the DC side of the inverter circuit through a filter circuit, and the control terminal of the rectifier circuit is connected to the output terminal of the rectifier control circuit.

[0037] Specifically, the rectifier circuit adopts a three-phase bridge fully controlled rectifier topology, consisting of six thyristors. Its DC side is connected to 380V three-phase power frequency AC through a circuit breaker, responsible for converting AC to pulsating DC. The trigger electrode of each thyristor is connected to the output terminal of the rectifier control circuit. By controlling the size of the trigger angle α (0°~180°), the amplitude of the rectified output voltage can be adjusted.

[0038] like Figure 2 As shown, the AC side of the inverter circuit is connected to the heater.

[0039] Optionally, the inverter circuit adopts a single-phase full-bridge topology constructed with IGBT modules, containing four IGBTs. Its DC side is connected in parallel with the output of the filter circuit, and the DC power is converted into AC power with adjustable frequency through high-frequency PWM modulation. The AC side of the inverter circuit is connected to the heater.

[0040] like Figure 2 As shown, the input terminal of the rectifier control circuit is connected to the output terminal of the control module.

[0041] Specifically, the rectifier control circuit receives a voltage reference signal from the control module at its input. This signal is converted to a digital value by an internal ADC and compared with a synchronization signal to generate six trigger pulses with a 60° phase difference. After optocoupler isolation and power amplification, the trigger pulses drive the thyristors in the rectifier circuit. The control circuit also features overcurrent and overvoltage protection; when an abnormal signal is detected, the trigger pulses are immediately blocked.

[0042] Optionally, in a practical application scenario, such as Figure 2 As shown, this heating power supply is a medium-frequency induction heating power supply, which can convert 50Hz AC power into AC power with a variable frequency of approximately 20kHz. The AC power (three-phase 380V) is converted to DC power after passing through an AC / DC rectifier circuit and a filter circuit, and then converted back to single-phase AC power of approximately 20kHz through an inverter circuit, thus achieving a conversion of the power supply's output voltage frequency. By changing the magnitude of the given signal, the rectifier firing angle is changed, thereby changing the output voltage and thus the output power.

[0043] In some alternative implementations, the temperature acquisition module includes a dual-color infrared thermometer.

[0044] Specifically, the dual-color infrared thermometer, based on Planck's law of radiation, employs dual-wavelength detection technology. Through two built-in high-sensitivity infrared detectors, it simultaneously receives infrared radiation energy from the workpiece surface at two different wavelengths (typically 0.8μm-1.1μm and 1.3μm-1.6μm). This dual-wavelength detection method endows it with superior temperature measurement performance: when there are local obstructions on the workpiece surface, such as smoke or water vapor, although these media absorb and scatter some infrared radiation, the attenuation of the two wavelengths is essentially the same. By calculating the ratio of the radiant energy of the two wavelengths, the instrument can effectively eliminate media interference and accurately obtain the true temperature of the object being measured. Even in extreme environments, its temperature measurement error can still be controlled within ±1℃.

[0045] In some alternative implementations, such as Figure 3 As shown, the control module includes: a PLC controller, an input / output module, and an opto-isolation module.

[0046] like Figure 3As shown, the power supply terminal of the PLC controller is connected to the power supply voltage, the input terminal of the PLC controller is connected to the output terminal of the temperature acquisition module, and the output terminal of the PLC controller is connected to the input terminal of the input / output module.

[0047] Specifically, the PLC controller analyzes and processes the collected temperature data based on the built-in PID control algorithm, and transmits the processed control commands to the input / output module in the form of digital signals through a dedicated communication bus.

[0048] like Figure 3 As shown, the output terminal of the input / output module is connected to the input terminal of the opto-isolation module.

[0049] Specifically, in the system, its input terminals receive control command signals from the PLC controller. These signals are processed by an internal level conversion circuit and converted into standard level signals suitable for the opto-isolation module to receive. The output terminals are connected to the input terminals of the opto-isolation module via terminal blocks, using a crimp-type wiring method to ensure the reliability of the electrical connection.

[0050] like Figure 3 As shown, the power supply terminal of the opto-isolation module is connected to the power supply voltage, and the output terminal of the opto-isolation module is connected to the input terminal of the heating power supply.

[0051] Specifically, the opto-isolation module internally employs an optocoupler composed of a light-emitting diode (LED) and a phototransistor. When the control signal transmitted from the input / output module reaches the input terminal of the opto-isolation module, the LED converts the electrical signal into an optical signal, which is then transmitted to the phototransistor via an optical channel. The phototransistor then converts the optical signal back into an electrical signal for output. This opto-isolation method blocks high-voltage interference from entering the control circuit from the power side, preventing signal distortion or equipment damage. It also eliminates ground loop current and common-mode voltage, ensuring a pure control signal. The output terminal of the opto-isolation module is connected to the input terminal of the rectifier control circuit of the heating power supply, transmitting the isolated control signal to the heating power supply. This enables precise control of the heating power supply's output power while ensuring the stability and safety of the control system.

[0052] In some alternative implementations, based on Figure 2 The structure shown employs a hybrid control strategy in the temperature control system: "fixed current heating in the initial stage + switching to PID control after reaching the threshold." This strategy accelerates the heating process while avoiding overshoot. The specific implementation method is as follows:

[0053] ① Fixed current heating stage:

[0054] When the temperature is below the set threshold (e.g., 80% of the target temperature), a fixed current is output (e.g., 80% of the range), which is determined by equation (1).

[0055] I fixed =I max ×k boost (1)

[0056] Among them, I max The maximum allowable current for the heater, e.g., 20mA corresponds to 100% output; k boost The acceleration factor is usually taken as 0.7 to 0.9, such as 0.8, which means heating with 80% power.

[0057] ② Switching condition judgment

[0058] When the temperature reaches or exceeds the threshold, switch to PID control to regulate the output current, where the target temperature for PID control is determined by equation (2).

[0059] T threshold =T target ×α(2)

[0060] Among them, T target α is the target temperature, such as 200℃; α is the switching ratio, usually 0.7 to 0.9, such as 0.8, which means that the PID switches when 80% of the target is reached.

[0061] ③PID control

[0062]

[0063] e(t) = T target -T actual (4)

[0064] Where u(t) is the PID output; e(t) is the temperature error; T actual This refers to the actual temperature; K. p K i K d These are the proportional, integral, and differential coefficients, respectively.

[0065] In some alternative implementations, such as Figure 4 As shown, the control module also includes a serial communication module, wherein the input terminal of the PLC controller is connected to the output terminal of the temperature acquisition module through the serial communication module.

[0066] Specifically, the serial communication module adopts the RS-485 industrial serial communication standard and receives temperature feedback data through differential signal transmission technology. The module incorporates a magnetically coupled isolation chip (ISO7762) to achieve electrical isolation between the communication line and the control system, with an isolation voltage of up to 2500Vrms. In industrial environments, especially in situations with strong electromagnetic interference such as those involving frequency converters and high-current equipment, it enhances anti-interference capabilities compared to analog signals in industrial environments (particularly in situations with frequency converters and high current).

[0067] In some alternative implementations, such as Figure 5 As shown, the temperature control system for the annealing process also includes a power supply, wherein the input terminal of the power supply is connected to AC power, and the output terminal of the power supply is connected to the power supply terminal of the temperature acquisition module and the power supply terminal of the control module.

[0068] In some alternative embodiments, the temperature control system for the annealing process further includes: a first control switch and a second control switch, wherein the first control switch is connected between the power supply and the input terminal of the AC power supply, and the second control switch is connected between the heating power supply and the AC power supply.

[0069] Specifically, the specific circuit structure of the temperature control system is as follows: Figures 6(a) to 6(b) As shown. It mainly includes: a main power switch; a 24V power supply switch (i.e., the first control switch); a 24V DC power supply (i.e., the power supply); an opto-isolation module; a heating device power supply switch (i.e., the second control switch); a medium-frequency heating device (i.e., the heating power supply); a PLC controller; an input / output module; a serial communication module; and a dual-color infrared thermometer.

[0070] Figures 6(a) to 6(b) In this circuit, QF1 is the main power switch, mainly used to control the on / off state of the main power supplies L1, L2, L3 and N; QF2 is mainly a 24V DC power supply. It receives a 220V input voltage and simultaneously outputs two sets of 24V voltages. Specifically, 1+ and 2+ output 24V+, and 1- and 2- output 24V-, providing 24V power to the PLC controller, opto-isolation module, and dual-color infrared thermometer.

[0071] Figures 6(a) to 6(b) In the process, pins 1 and 2 of the opto-isolation module are the power supply terminals, receiving 24V+ and 24V- respectively. Pins 5 and 6 are the analog signal input terminals, connected to pins 6 and 7 of the output bus X12 of the input / output module (K2) using shielded twisted-pair cables. The G and SV pins of its output terminals are connected to the 0V and 5V pins of the intermediate frequency heating device using shielded twisted-pair cables respectively. The output power of the induction heating power supply device is controlled by controlling the magnitude of the given voltage (0-5V).

[0072] Figures 6(a) to 6(b)In the middle, the medium frequency heating device controls the on / off of 380V three-phase AC power through switch QF3; the PLC controller (i.e. K1) adopts Siemens S7-SMART-CPU-ST20. Terminal 1 (1M) of its X11 row is the reference potential connected to 24V- as the common terminal (reference point) of the input signal. Terminals 6 (L+) and 7 (M) are connected to 24V+ and 24V- respectively as the power input terminals of the PLC controller, used to power the CPU. Terminals 1 (2L+) and 2 (2M) of the X12 row are used to provide power to the output points.

[0073] Figures 6(a) to 6(b) In the analog input / output module (K2), terminals 1 (L+) and 2 (M) of the X10 row are connected to 24V+ and 24V- respectively, which are the working power supply terminals of the module and are used to power the internal circuit of the module. Terminals 6 (0M) and 7 (0) of the X12 row are the reference ground and output signal terminals of analog output channel 0, which are connected to the given signal input terminal of the medium frequency annealing furnace. The output power of the induction heating power supply can be controlled by outputting a continuously changing voltage signal (0-5V).

[0074] Figures 6(a) to 6(b) In the serial communication module (K3), terminals 2 (Tx / B) and 5 (Rx / A) of the X20 row are the signal lines of the RS485 communication interface, which are connected to terminals 6 (B) and 5 (A) of the thermometer respectively, and the real-time temperature of the infrared thermometer is read through the Modbus RTU protocol.

[0075] In some alternative implementations, the temperature control system for the annealing process further includes a human-machine interface module, wherein the human-machine interface module is connected to the control module.

[0076] Specifically, operators can set annealing process parameters through a touch screen or other input devices, monitor the system's operating status in real time, and achieve intelligent management of temperature control throughout the entire annealing process.

[0077] This embodiment provides a heating system, including: a temperature control system and a heater for the annealing process of the above embodiments and any optional embodiments thereof.

[0078] The temperature control system for the annealing process includes a heating power supply, a temperature acquisition module, and a control module. The power supply terminal of the temperature acquisition module is connected to the power supply voltage, and the temperature acquisition module is used to acquire the temperature of the annealed workpiece. The power supply terminal of the heating power supply is connected to AC power, the input terminal of the heating power supply is connected to the output terminal of the control module, and the output terminal of the heating power supply is connected to the heater. The heater is used to heat the annealed workpiece. The power supply terminal of the control module is connected to the power supply voltage, and the input terminal of the control module is connected to the output terminal of the temperature acquisition module.

[0079] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A temperature control system for an annealing process, characterized by, include: The system includes a heating power supply, a temperature acquisition module, and a control module. The control module comprises a PLC controller, an input / output module, and an opto-isolation module. The power supply terminal of the temperature acquisition module is connected to the power supply voltage, and the temperature acquisition module is used to acquire the temperature of the annealed workpiece; The power supply terminal of the heating power supply is connected to AC power, the input terminal of the heating power supply is connected to the output terminal of the opto-isolation module, and the output terminal of the heating power supply is connected to the heater. The heater is used to heat the annealed workpiece; The power supply terminal of the PLC controller is connected to the power supply voltage, the input terminal of the PLC controller is connected to the output terminal of the temperature acquisition module, and the output terminal of the PLC controller is connected to the input terminal of the input / output module. The output terminal of the input / output module is connected to the input terminal of the opto-isolation module; The power supply terminal of the opto-isolation module is connected to the power supply voltage, and the output terminal of the opto-isolation module is connected to the input terminal of the heating power supply.

2. The temperature control system for an annealing process according to claim 1, wherein, The heating power supply is a variable frequency heating power supply.

3. The temperature control system for an annealing process according to claim 2, wherein, The heating power supply includes: a rectifier circuit, a filter circuit, an inverter circuit, and a rectifier control circuit, wherein... The DC side of the rectifier circuit is connected to AC power, the AC side of the rectifier circuit is connected to the DC side of the inverter circuit through the filter circuit, and the control terminal of the rectifier circuit is connected to the output terminal of the rectifier control circuit. The AC side of the inverter circuit is connected to the heater; The input terminal of the rectifier control circuit is connected to the output terminal of the control module.

4. The temperature control system for an annealing process of claim 1, wherein, The temperature acquisition module includes a dual-color infrared thermometer.

5. The temperature control system for an annealing process of claim 1, wherein, The control module further includes a serial communication module, wherein... The input terminal of the PLC controller is connected to the output terminal of the temperature acquisition module through the serial communication module.

6. The temperature control system of an annealing process according to claim 1, wherein, Also includes: power supply Power supply, among which, The input terminal of the power supply is connected to AC power, and the output terminal of the power supply is connected to the power supply terminal of the temperature acquisition module and the power supply terminal of the control module.

7. The temperature control system for the annealing process according to claim 6, characterized in that, Also includes: The first control switch, wherein... The first control switch is connected between the power supply and the input terminal of the AC power.

8. The temperature control system for the annealing process according to claim 1, characterized in that, Also includes: The second control switch, wherein... The second control switch is connected between the heating power supply and the AC power.

9. The temperature control system for the annealing process according to claim 1, characterized in that, Also includes: Human-computer interaction module, in which, The human-computer interaction module is connected to the control module.

10. A heating system, characterized in that, include: The temperature control system and heater for the annealing process according to any one of claims 1-9.

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