A two-stage non-magnetic resistance pipe heating system and temperature control method

Abstract

The present invention provides a two-stage non-magnetic resistance pipe heating system and temperature control method. By using a twisted pair resistance wire heating circuit, the magnetic fields generated by the current during the heating process are offset as much as possible, minimizing the impact of the magnetic field generated by electric heating. Then, the positive and negative reciprocating loop structure design eliminates the remaining subtle magnetic interference, achieving the function of eliminating the additional magnetic field noise caused by heating as much as possible. The present invention uses a three-wire platinum resistance temperature measurement system or a laser temperature measurement system to collect and feedback the heating temperature in real time, thereby improving the accuracy and sensitivity of the non-magnetic temperature sensor in measuring temperature. Therefore, the present invention uses a two-stage non-magnetic heating device to achieve non-magnetization during the heating process; through a temperature regulation control device, the heating temperature during the heating process is continuously controllable and adjustable, expanding the temperature control range; it facilitates the miniaturization of the heating system, and the heating power is adjustable, which is suitable for the heat treatment of pipe materials with different melting points.

Description

Technical Field

[0001] The present invention belongs to the technical field of non-magnetic heat treatment, and in particular relates to a two-stage non-magnetic resistance type pipe heating system and a temperature control method. Background Art

[0002] Non-magnetic heating technology has important application value in heat treatment technology for pipe samples that are extremely sensitive to magnetic field signals, or in optical, electrical, thermal, magnetic and other detection situations that require non-magnetic heating technology. The purpose is to eliminate the influence of additional magnetic field noise caused by heating.

[0003] Currently, non-magnetic heating technologies primarily include hot air flow heating and laser heating. Hot air flow heating uses high-temperature gas to heat an air chamber, injecting a hot air flow into the heating device. While simple and easy to implement, it suffers from low temperature control accuracy and difficulty miniaturizing. Laser heating uses laser radiation to irradiate the target object, achieving non-magnetic heating. However, the localized intensity of the incident heating laser is high, while the overall heating power is low, making it unsuitable for heating certain low-melting-point materials.

[0004] Traditional resistance heating uses a resistance heater to wrap the object and achieves the heating function by adjusting the voltage or current. It is easy to operate and has high temperature control accuracy. However, due to the flow of current in the circuit, traditional electric heating methods are prone to magnetic field noise, making it difficult to achieve non-magnetic heating. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a two-stage non-magnetic resistance pipe heating system and a temperature control method for eliminating the influence of additional magnetic field noise caused by electric heating.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a two-stage non-magnetic resistance pipe heating system, including a temperature adjustment control device, a temperature acquisition device and a two-stage non-magnetic heating device; the temperature adjustment control device includes a main control module, a drive module, a rectifier and voltage regulation module and a filter module connected according to the instruction flow direction; the main control module is used to receive temperature information provided by the temperature acquisition device, and adjust the output power of the rectifier and voltage regulation module through the drive module to control the temperature of the two-stage non-magnetic heating device; the temperature acquisition device adopts a platinum resistance temperature measurement system or a laser temperature measurement system; the two-stage non-magnetic heating device includes a first-stage non-magnetic heating twisted pair resistance wire and a second-stage hollow tubular component; the second-stage hollow tubular component is a forward and reverse reciprocating loop structure, the first-stage non-magnetic twisted pair resistance wire is arranged along the second-stage hollow tubular component, and the first-stage non-magnetic twisted pair resistance wire and the second-stage hollow tubular component form a two-stage non-magnetic electric heating composite structure; the rectifier and voltage regulation module, the filter module and the two-stage non-magnetic heating device form a heating main circuit.

[0007] According to the above scheme, when the input power supply of the temperature control device is single-phase AC220V 50Hz, the temperature adjustment range is room temperature to 1350℃; when the input power supply is three-phase AC380V 50Hz, the temperature adjustment range is room temperature to 3000℃; the temperature control device is also used in heating systems in temperature zones above liquid nitrogen and liquid helium.

[0008] According to the above scheme, the two-stage non-magnetic heating device also includes a non-magnetic heating sleeve for placing the sample; the non-magnetic heating sleeve is placed in the two-stage non-magnetic electric heating composite structure.

[0009] Furthermore, the platinum resistance temperature measurement system is a three-wire system, and the temperature sensor is a platinum resistance thermocouple, which is used to place the platinum thermocouple temperature measurement probe close to the non-magnetic heating sleeve or extend it into the inside of the non-magnetic heating sleeve to perform contact temperature measurement on the component to be measured.

[0010] According to the above scheme, the temperature sensor of the laser temperature measurement system is a laser temperature measurement probe, which realizes non-contact temperature measurement by high-speed laser response to the thermal radiation of the component to be measured.

[0011] According to the above solution, the temperature adjustment control device further comprises a display module connected to the main control module for displaying information including temperature, heating time and set temperature.

[0012] A temperature control method for a two-stage non-magnetic resistance pipe heating system, characterized by comprising the following steps:

[0013] S1: Develop a temperature control plan based on the heating process requirements of the heating pipe sample materials within different power ranges;

[0014] S2: According to the temperature control scheme, select the input power supply as single-phase 220V 50Hz or three-phase 380V 50Hz, and select the temperature measurement system of the temperature acquisition device as a three-wire platinum resistance temperature measurement system or a laser temperature measurement system;

[0015] S3: Place the sample to be heated in the non-magnetic heating sleeve;

[0016] S4: The system is powered on, the temperature control device performs a self-check and starts working, and the temperature acquisition device feeds back real-time temperature information to the temperature control device;

[0017] S5: The main control module of the temperature control device outputs a corresponding control signal through an adaptive algorithm according to the feedback data information to adjust the temperature of the two-stage non-magnetic heating device, and displays information including temperature, heating time and set temperature on the display module;

[0018] S6: The heating process ends, and the heating is stopped and the furnace is cooled or the heating current is gradually reduced by program control until it is completely cooled.

[0019] Furthermore, in step S5, the temperature adjustment of the temperature control device is carried out in the following specific steps:

[0020] The main control module inputs the temperature information collected by the temperature collection device;

[0021] The main control module sends the output instructions to the drive module through the adaptive control algorithm;

[0022] The driving module adjusts the output power of the rectifier and voltage regulator module to control the temperature of the non-magnetic heating device;

[0023] The filter module filters out the rectification harmonics on the main circuit.

[0024] Furthermore, in step S5, the specific steps of eliminating magnetic field noise of the two-stage non-magnetic heating device are as follows:

[0025] When the first-stage non-magnetic heating twisted pair resistance wire is working, the currents in the heating resistance wire are equal in magnitude and opposite in direction, and the magnetic radiation generated cancels each other out, reducing the magnetic field noise generated by the heating current;

[0026] The forward and reverse reciprocating circuit structure of the second-stage hollow tubular member further eliminates the effects of residual magnetism and leakage magnetic noise generated by the current during the heating process.

[0027] A computer memory stores a computer program that can be executed by a computer processor. The computer program executes a temperature control method for a two-stage non-magnetic resistance type pipe heating system.

[0028] The beneficial effects of the present invention are:

[0029] 1. The present invention provides a two-stage non-magnetic resistance pipe heating system and temperature control method. By adopting a twisted pair resistance wire heating circuit, the magnetic fields generated by the current during the heating process are offset as much as possible, thereby minimizing the impact of the magnetic field generated by electric heating. The positive and negative reciprocating loop structure design eliminates any remaining subtle magnetic interference, thereby eliminating the impact of additional magnetic field noise caused by heating.

[0030] 2. The present invention uses a three-wire platinum resistance temperature measurement system to collect and feedback the temperature of the heating device in real time, which solves the impact of resistance value error or temperature error in the resistance circuit, eliminates the voltage error caused by the change of power supply voltage, is not affected by the power supply voltage and the length of the wire, improves the precision and accuracy of temperature measurement, and improves the precision and sensitivity of the two-stage non-magnetic resistance pipe heating system and method; or uses a laser temperature measurement system to collect and feedback the heating temperature in real time. The laser temperature measurement system senses the thermal radiation energy of the component to be measured and is a non-contact temperature measurement, which also improves the accuracy of the non-magnetic temperature sensor in measuring temperature, and also improves the precision and sensitivity of the two-stage non-magnetic resistance pipe heating system and method.

[0031] 3. The present invention adopts a two-stage non-magnetic heating device; the first stage makes the current in the heating resistance wire equal in magnitude and opposite in direction, offsetting the magnetic field noise generated by the current flow; the second stage again offsets the residual magnetism and leakage magnetic interference after the first stage non-magnetic treatment through the forward and reverse reciprocating loop structure design, thereby realizing non-magnetization of the heating process.

[0032] 4. Considering only the heating system in the temperature zone above room temperature, the present invention realizes continuous control and adjustment of the heating temperature from room temperature to 1350°C (single-phase 220V 50Hz) / room temperature to 3000°C (three-phase 380V 50Hz) during the heating process through the temperature adjustment control device, thereby expanding the temperature control range.

[0033] 5. The present invention can meet the diverse size requirements of samples through customized design of the second-stage hollow tubular heating component and the non-magnetic heating sleeve, and facilitates the miniaturization of the non-magnetic heating system.

[0034] 6. The present invention heats the entire sample uniformly, and the heating power is adjustable. It is suitable for non-magnetic heat treatment of pipe materials with different melting points, arbitrary lengths and diameters, as well as bulk materials, powders, films and other samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the module composition of an embodiment of the present invention.

[0036] Figure 2 It is a flow chart of the main program in the temperature control device according to an embodiment of the present invention.

[0037] Figure 3 Schematic diagram of the twisted structure of the first-level non-magnetic heating twisted pair resistance wire in an embodiment of the present invention.

[0038] Figure 4 Schematic diagram of the structure of the second-stage hollow tubular component of an embodiment of the present invention.

[0039] Figure 5 Schematic diagram of the internal composite structure of a two-stage non-magnetic heating device according to an embodiment of the present invention.

[0040] Figure 6 Schematic diagram of a platinum resistance contact temperature measurement AC 220V input heating system according to an embodiment of the present invention.

[0041] Figure 7 Schematic diagram of a platinum resistance contact temperature measurement AC 380V input heating system according to an embodiment of the present invention.

[0042] Figure 8 Schematic diagram of a laser non-contact temperature measurement AC 220V input heating system according to an embodiment of the present invention.

[0043] Figure 9 Schematic diagram of a laser non-contact temperature measurement AC 380V input heating system according to an embodiment of the present invention.

[0044] In the figure: 1. Temperature adjustment control device; 2. Two-stage non-magnetic heating device; 3. Temperature acquisition device; 4. Non-magnetic heating sleeve. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] See also Figure 1 The present invention includes a temperature adjustment control device, a temperature acquisition device and a two-stage non-magnetic heating device, such as Figure 1 shown.

[0047] 1. The temperature regulation control device includes a main control module, a display module, a drive module, a rectifier and voltage regulation module, and a filter module.

[0048] There are two types of input for the temperature control device: single-phase AC220V 50Hz and three-phase AC380V50Hz. Select the appropriate input power according to the requirements of the heating sample, such as Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 As shown, when the input power is single-phase AC220V 50Hz, the temperature adjustment range is room temperature to 1350℃; when the input power is three-phase AC380V 50Hz, the temperature adjustment range is room temperature to 3000℃.

[0049] 2. The temperature acquisition device is a platinum resistance temperature measurement system or a laser temperature measurement system, which consists of a temperature sensor, a data processing module, cables, etc.

[0050] The platinum resistance temperature measurement system is a three-wire platinum resistance temperature measurement system. The temperature sensor is a platinum resistance thermocouple, which is a contact temperature measurement sensor. When measuring, the platinum thermocouple temperature measurement probe is close to the non-magnetic heating sleeve or extends into the inside of the non-magnetic heating sleeve to perform contact temperature measurement on the component to be measured. Figure 6 and Figure 7 shown.

[0051] The temperature sensor of the laser temperature measurement system is a laser temperature measurement probe. During measurement, the laser responds to the thermal radiation of the component to be measured at high speed, realizing non-contact temperature measurement and avoiding the introduction of magnetic field noise interference to the entire non-magnetic heating system, thus ensuring the accuracy and sensitivity of the non-magnetic heating system. Figure 8 and Figure 9 shown.

[0052] 3. The two-stage non-magnetic heating device mainly consists of three parts: the first-stage non-magnetic heating twisted pair resistance wire, the second-stage hollow tubular component and the non-magnetic heating sleeve. The first-stage non-magnetic heating part is as follows: Figure 3 As shown, the second stage non-magnetic heating part is as follows Figure 4 As shown, the non-magnetic heating sleeve is Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 .

[0053] The first stage of the two-stage non-magnetic heating device is a non-magnetic heating twisted pair resistance wire. When working, the currents in the heating resistance wires are equal in magnitude and opposite in direction, and the magnetic radiation generated cancels each other out, which can effectively reduce the magnetic field noise of the heating wire. Figure 3 shown.

[0054] The second-stage hollow tubular component of the two-stage non-magnetic heating device is designed as a forward and reverse reciprocating circuit structure, such as Figure 4 As shown, the interior is the first-level non-magnetic twisted pair resistance wire, and the first-level and second-level non-magnetic heating parts are a composite structure, as shown Figure 5 As shown, the second-stage hollow tubular component again eliminates the influence of residual magnetism and leakage magnetic noise generated by the current during the heating process. Therefore, the two-stage non-magnetic heating device can eliminate magnetic field noise at two levels, thereby improving the accuracy and sensitivity of the entire non-magnetic heating device.

[0055] The rectifier and voltage regulator module and the filter module of the temperature control device and the first-stage twisted heating resistance wire of the two-stage non-magnetic heating device together form a main heating circuit.

[0056] In the two-stage non-magnetic heating device, the sample to be heated needs to be placed in the non-magnetic heating sleeve, such as Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 shown.

[0057] A two-stage non-magnetic resistance pipe heating method of the present invention comprises the following steps:

[0058] Step 1: Develop a temperature control plan for the temperature regulating control device based on the heating process requirements of the pipe sample materials within different power ranges.

[0059] Step 2: According to the temperature control scheme, select the input power supply (single-phase 220V 50Hz or three-phase 380V 50Hz) and the temperature measurement system of the temperature acquisition device (three-wire platinum resistance temperature measurement system or laser temperature measurement system).

[0060] Step 3: Place the sample material to be processed in the non-magnetic heating sleeve.

[0061] Step 4: All components of the heating system are powered on, the temperature control device performs self-check and starts working, the temperature acquisition device feeds back real-time temperature information and inputs it to the temperature control device.

[0062] Step 5: The main control module inside the temperature regulation control device outputs the corresponding control signal through the adaptive algorithm according to the feedback data information, realizes the temperature regulation of the two-stage non-magnetic heating device, and displays the temperature, heating time, set temperature and other information on the display module.

[0063] Step 6: After the heating process is completed, stop heating and cool the furnace or program-controlled cooling to obtain a sample that has undergone non-magnetic heat treatment.

[0064] The main program flow in the temperature control device is as follows: the temperature information collected by the temperature acquisition device is provided as input to the main control module, the main control module outputs instructions to the drive circuit through the adaptive control algorithm, and the temperature of the non-magnetic heating device is controlled by adjusting the output power of the rectifier and voltage regulator module. The filter module filters out the rectifier harmonics on the main circuit, such as Figure 2 shown.

[0065] It should be understood that the size of the serial numbers of the above steps does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of this application.

[0066] Example 1, as Figure 6 As shown:

[0067] 1) The input voltage of this embodiment is single-phase AC220V 50Hz. During the heating process, the temperature adjustment control device can achieve a temperature adjustment range of room temperature to 1350°C;

[0068] 2) In this embodiment, the sample material to be processed is placed in a non-magnetic heating sleeve;

[0069] 3) The temperature acquisition device in this embodiment is a three-wire platinum resistance temperature measurement system;

[0070] 4) In the three-wire platinum resistance temperature measurement system of this embodiment, the platinum thermocouple temperature measurement probe is closely attached to the non-magnetic heating sleeve or extends into the non-magnetic heating sleeve to contact the pipe material to be measured, performing contact temperature measurement on the component to be measured and providing real-time feedback of the temperature during the heating process to the temperature control device;

[0071] 5) The temperature control device outputs instructions to the drive circuit through an adaptive control algorithm based on the real-time collected temperature. Based on the output of the drive circuit, the rectifier and voltage regulator module rectifies and converts the single-phase AC220V 50Hz input voltage and outputs the rectified voltage. This voltage can be used to adjust the current of the first-stage heating resistor in the two-stage non-magnetic heating device, thereby achieving heating temperature regulation within the two-stage non-magnetic heating device.

[0072] 6) The two-stage non-magnetic heating device in this embodiment can achieve non-magnetic heating of the sample.

[0073] Example 2, as Figure 7 As shown:

[0074] 1) The input voltage of this embodiment is three-phase AC 380V 50Hz. During the heating process, the temperature adjustment control device can achieve a temperature adjustment range of room temperature to 3000°C;

[0075] 2) In this embodiment, the sample material to be processed is placed in a non-magnetic heating sleeve;

[0076] 3) The temperature acquisition device in this embodiment is a three-wire platinum resistance temperature measurement system;

[0077] 4) In the three-wire platinum resistance temperature measurement system of this embodiment, the platinum thermocouple temperature measurement probe is closely attached to the non-magnetic heating sleeve or extends into the non-magnetic heating sleeve to contact the pipe to be measured, performing contact temperature measurement on the component to be measured and providing real-time feedback of the temperature during the heating process to the temperature control device;

[0078] 5) The temperature control device outputs instructions to the drive circuit through an adaptive control algorithm based on the real-time collected temperature. Based on the output of the drive circuit, the rectifier and voltage regulator module rectifies and converts the three-phase AC380V 50Hz input voltage and outputs the rectified voltage. This voltage can be used to adjust the current of the first-stage heating resistor in the two-stage non-magnetic heating device, thereby achieving heating temperature regulation within the two-stage non-magnetic heating device.

[0079] 6) The two-stage non-magnetic heating device in this embodiment can achieve non-magnetic heating of the sample.

[0080] Example 3, as Figure 8 As shown:

[0081] 1) The input voltage of this embodiment is single-phase AC220V 50Hz. During the heating process, the temperature adjustment control device can achieve a temperature adjustment range of room temperature to 1350°C;

[0082] 2) In this embodiment, the sample material to be processed is placed in a non-magnetic heating sleeve;

[0083] 3) The temperature acquisition device in this embodiment is a laser temperature measurement system;

[0084] 4) The laser temperature measurement system in this embodiment senses the thermal radiation energy of the component to be measured, which is a non-contact temperature measurement, and provides real-time feedback of the temperature during the heating process to the temperature control device;

[0085] 5) The temperature control device outputs instructions to the drive circuit through an adaptive control algorithm based on the real-time collected temperature. Based on the output of the drive circuit, the rectifier and voltage regulator module rectifies and converts the single-phase AC220V 50Hz input voltage and outputs the rectified voltage. This voltage can be used to adjust the current of the first-stage heating resistor in the two-stage non-magnetic heating device, thereby achieving heating temperature regulation within the two-stage non-magnetic heating device.

[0086] 6) The two-stage non-magnetic heating device in this embodiment can achieve non-magnetic heating of the sample.

[0087] Example 4, as Figure 9 As shown:

[0088] 1) The input voltage of this embodiment is three-phase AC 380V 50Hz. During the heating process, the temperature adjustment control device can achieve a temperature adjustment range of room temperature to 3000°C;

[0089] 2) In this embodiment, the sample material to be processed is placed in a non-magnetic heating sleeve;

[0090] 3) The temperature acquisition device in this embodiment is a laser temperature measurement system;

[0091] 4) The laser temperature measurement system in this embodiment senses the thermal radiation energy of the component to be measured, which is a non-contact temperature measurement, and provides real-time feedback of the temperature during the heating process to the temperature control device;

[0092] 5) The temperature control device outputs instructions to the drive circuit through an adaptive control algorithm based on the real-time collected temperature. Based on the output of the drive circuit, the rectifier and voltage regulator module rectifies and converts the three-phase AC380V 50Hz input voltage and outputs the rectified voltage. This voltage can be used to adjust the current of the first-stage heating resistor in the two-stage non-magnetic heating device, thereby achieving heating temperature regulation within the two-stage non-magnetic heating device.

[0093] 6) The two-stage non-magnetic heating device in this embodiment can achieve non-magnetic heating of the sample.

[0094] The above embodiments are intended only to illustrate the design concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. The scope of protection of the present invention is not limited to the above embodiments. Therefore, any equivalent changes or modifications made based on the principles and design concepts disclosed in the present invention are within the scope of protection of the present invention.

Claims

1. A two-stage non-magnetic resistance pipe heating system, characterized by: It includes a temperature adjustment control device, a temperature acquisition device and a two-stage non-magnetic heating device; The temperature control device includes a main control module, a drive module, a rectifier and voltage regulator module, and a filter module connected according to the instruction flow; the main control module is used to receive temperature information provided by the temperature acquisition device and adjust the output power of the rectifier and voltage regulator module through the drive module to control the temperature of the two-stage non-magnetic heating device; The temperature acquisition device adopts a platinum resistance temperature measurement system or a laser temperature measurement system; The two-stage non-magnetic heating device includes a first-stage non-magnetic heating twisted pair resistance wire and a second-stage hollow tubular member; the second-stage hollow tubular member is a forward and reverse reciprocating loop structure, and the first-stage non-magnetic twisted pair resistance wire is arranged along the second-stage hollow tubular member. The first-stage non-magnetic twisted pair resistance wire and the second-stage hollow tubular member form a two-stage non-magnetic electric heating composite structure; The rectifier and voltage regulator module, the filter module and the two-stage non-magnetic heating device form a main heating circuit.

2. A two-stage non-magnetic resistance pipe heating system according to claim 1, characterized in that: When the input power supply of the temperature control device is single-phase AC220V 50Hz, the temperature adjustment range is room temperature to 1350℃; when the input power supply is three-phase AC380V 50Hz, the temperature adjustment range is room temperature to 3000℃; the temperature control device is also used in heating systems in temperature zones above liquid nitrogen and liquid helium.

3. The two-stage non-magnetic resistance pipe heating system according to claim 1, characterized in that: The two-stage non-magnetic heating device also includes a non-magnetic heating sleeve for placing samples; the non-magnetic heating sleeve is placed in the two-stage non-magnetic electric heating composite structure.

4. A two-stage non-magnetic resistance pipe heating system according to claim 3, characterized in that: The platinum resistance temperature measurement system is a three-wire system. The temperature sensor is a platinum resistance thermocouple. The platinum thermocouple temperature measurement probe is placed close to the non-magnetic heating sleeve or inserted into the non-magnetic heating sleeve to perform contact temperature measurement on the component to be measured.

5. The two-stage non-magnetic resistance pipe heating system according to claim 1, characterized in that: The temperature sensor of the laser temperature measurement system is a laser temperature measurement probe, which realizes non-contact temperature measurement by high-speed laser response to the thermal radiation of the component to be measured.

6. The two-stage non-magnetic resistance pipe heating system according to claim 1, characterized in that: The temperature adjustment control device also includes a display module connected to the main control module for displaying information including temperature, heating time and set temperature.

7. A temperature control method for a two-stage non-magnetic resistance pipe heating system according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Develop a temperature control plan based on the heating process requirements of the heating pipe sample materials within different power ranges; S2: According to the temperature control scheme, select the input power supply as single-phase 220V 50Hz or three-phase 380V 50Hz, and select the temperature measurement system of the temperature acquisition device as a three-wire platinum resistance temperature measurement system or a laser temperature measurement system; S3: Place the sample to be heated in the non-magnetic heating sleeve; S4: The system is powered on, the temperature control device performs a self-check and starts working, and the temperature acquisition device feeds back real-time temperature information to the temperature control device; S5: The main control module of the temperature control device outputs a corresponding control signal through an adaptive algorithm according to the feedback data information to adjust the temperature of the two-stage non-magnetic heating device, and displays information including temperature, heating time and set temperature on the display module; S6: The heating process ends, and the heating is stopped and the furnace is cooled or the heating current is gradually reduced by program control until it is completely cooled.

8. The temperature control method of a two-stage non-magnetic resistance pipe heating system according to claim 7, characterized in that: In step S5, the temperature adjustment of the temperature control device is carried out in the following specific steps: The main control module inputs the temperature information collected by the temperature collection device; The main control module sends the output instructions to the drive module through the adaptive control algorithm; The driving module adjusts the output power of the rectifier and voltage regulator module to control the temperature of the non-magnetic heating device; The filter module filters out the rectification harmonics on the main circuit.

9. The temperature control method of a two-stage non-magnetic resistance pipe heating system according to claim 7, characterized in that: In step S5, the specific steps of eliminating magnetic field noise of the two-stage non-magnetic heating device are as follows: When the first-stage non-magnetic heating twisted pair resistance wire is working, the currents in the heating resistance wire are equal in magnitude and opposite in direction, and the magnetic radiation generated cancels each other out, reducing the magnetic field noise generated by the heating current; The forward and reverse reciprocating circuit structure of the second-stage hollow tubular member further eliminates the effects of residual magnetism and leakage magnetic noise generated by the current during the heating process.

10. A computer memory, characterized in that: A computer program executable by a computer processor is stored therein, and the computer program executes the temperature control method of a two-stage non-magnetic resistance type pipe heating system according to any one of claims 7 to 9.

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