Pulse current targeted heat compensation method and device based on local electromagnetic induction heating

Abstract

The invention provides a pulse current targeted heat compensation method and device based on local electromagnetic induction heating, and relates to the technical field of heat treatment of metal materials for rail transit. An induction coil assembly is used for heating the special-shaped steel rail until the temperature reaches 800 DEG C, a thermal infrared imager is used for recording and generating temperature distribution diagrams of the tread and the side face of the special-shaped steel rail, the difference between the obtained temperature distribution diagrams and a preset target temperature curve is obtained, first-time temperature compensation is carried out, and temperature data are recorded; and an induction heating model of the special-shaped steel rail is established, and second-time temperature compensation is carried out. The device comprises a base assembly, a three-axis movement assembly, a placement assembly, a lifting assembly, an electrode adjusting assembly and an induction coil assembly. According to the method, temperature distribution can be accurately controlled, cooling zones can be optimized, and energy consumption can be reduced, so that the stability and reliability of the quality of special-shaped steel rail products are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat treatment of metal materials for rail transit, and particularly relates to a pulse current targeted heat supplement method and device based on local electromagnetic induction heating. BACKGROUND

[0002] With the rapid development of high-speed railway technology, the improvement of train running speed puts forward higher requirements for the structure and performance of the track. The profiled rail (steel rail with two rail types) produced in the prior art generally has surface defects such as cracks, overburning and local pits, and the grain size of the metallographic structure is large, which makes it difficult to meet the safety and reliability requirements of high-speed train operation.

[0003] In the production process of traditional profiled rails, the stress is mainly generated from three aspects of thermal stress, mechanical stress and material properties. These stresses will cause multiple negative effects: first, they will cause the deformation of the rail structure, reduce the track smoothness and increase the running noise; second, the stress concentration area is prone to fatigue cracks, which shortens the service life; at the same time, tensile stress will deteriorate the toughness and hardness of the rail, and compressive stress may cause local hardening and aggravate wear, and even cause size instability or stress corrosion cracking due to long-term stress release. Meanwhile, the optimization of the processing flow by means of controlled cooling technology (graded cooling), online stress detection and homogenization treatment (such as annealing) cannot completely achieve complete stress control.

[0004] For example, patent 207210863U discloses a rail longitudinal heating inductor, which cannot guarantee the uniformity of quenching hardness and quenching layer depth. Patent CN109234501B discloses a device and process for pulse current assisted rail online induction heating, which adopts a basic quenching process and lacks a dynamic temperature compensation mechanism, making it difficult to meet the high-precision quenching requirements; at the same time, the local heating response is lagging, which is prone to cause quenching quality fluctuations, the cooling partition and the thermal stress regulation rely on empirical parameters, which has poor adaptability; and the pulse current frequency is single, which cannot optimize the heat conduction efficiency through low-frequency-high-frequency segmented heat supplement, resulting in high energy consumption and insufficient quenching uniformity. At the same time, the existing technology has the following technical defects when performing heat treatment on profiled rails: first, the temperature control precision is insufficient, and it is difficult to achieve partitioned temperature control of the forming section, the transition section and the heat affected zone; second, the cooling speed and partition control are difficult, which easily causes uneven hardness distribution and excessive width of the softening zone; in addition, when performing local targeted heating, the surface layer temperature of the rail end face rapidly rises due to the skin effect, and at the same time, the heat is conducted from the end face surface layer to the inside of the rail and the two sides of the rail head through heat conduction, and the temperature gradually decreases. On the middle section of the rail, the overall temperature gradually decreases from the outer surface of the rail head to the inside of the rail, resulting in a large temperature difference between the inside and outside of the rail.

[0005] The above technical defects are more difficult to achieve uniform heating and partition cooling when facing complex cross-section steel rails, thereby causing quality defects such as local overheating, insufficient hardening layer depth or unqualified toughness index. In view of the above problems, it is urgent to develop a heat treatment method capable of precisely controlling temperature distribution, optimizing cooling partition, improving production efficiency and reducing energy consumption, realizing the stability and reliability of the quality of special-shaped rail products, and meeting the urgent needs of rail transportation for high-performance and long-life steel rails. SUMMARY

[0006] In order to solve the above problems of the prior art, the purpose of the present application is to provide a pulse current targeted heat compensation method and device based on local electromagnetic induction heating. First, the infrared thermal imager records and generates the temperature distribution diagram of the tread and side surface of the special-shaped rail heated by the induction coil assembly, and the temperature difference between the obtained temperature distribution diagram and the preset target temperature curve is calculated. If the temperature difference is greater than the threshold value, the first temperature compensation is performed; then, according to the temperature data after the first temperature compensation, the induction heating model of the special-shaped rail is established, and the second temperature compensation is performed, so that the overall temperature of the special-shaped rail is homogenized during the heating process, and precise heat compensation is realized. At the same time, the independent electrode head module moves under the action of the electrode adjusting assembly to generate a new magnetic field with the original magnetic field generated by the induction coil assembly, and a new overall electromagnetic field is generated at the rail head of the special-shaped rail. The new electromagnetic field can generate current heat effect at the place where the temperature difference exceeds the threshold value, so as to further reduce the temperature difference of the special-shaped rail, thereby changing the quality and mechanical properties of the surface of the special-shaped rail.

[0007] Specifically, in one aspect, the present application provides a pulse current targeted heat compensation method based on local electromagnetic induction heating, and the specific steps are as follows: S1, use the three-axis motion assembly to run the special-shaped rail located on the placing assembly to the lower side of the induction coil assembly, and adjust the distance between the special-shaped rail and the induction coil assembly, and adjust the distance between the independent electrode head modules.

[0008] S2, use the lifting assembly to contact the independent electrode head module and the tread of the special-shaped rail, and judge the pressure therebetween. When the pressure meets the requirements, step S3 is entered.

[0009] S3, use the induction coil assembly to heat the special-shaped rail until the temperature reaches 800℃, and record and generate the temperature distribution diagram of the tread and side surface of the special-shaped rail by the infrared thermal imager.

[0010] S4, calculate the difference between the temperature distribution curve obtained in step S3 and the preset target temperature curve. If the temperature difference is greater than the threshold value of 100℃, the first temperature compensation is performed and the temperature data is recorded. If the temperature difference is less than or equal to the threshold value of 100℃, the temperature data is directly recorded.

[0011] S5. Based on the temperature data obtained in step S4, establish an induction heating model for the irregular-shaped steel rail. The specific process is as follows: S51. Establish the transient heat transfer expression for irregularly shaped steel rails.

[0012] S52. Based on step S51, and taking into account the number of turns of the coil in the induction coil assembly, the wire diameter of the coil, and the distance between the coil and the special-shaped steel rail, establish the relationship between the coil temperature and the average temperature difference of the coil at the three-dimensional coordinates (x, y, z) at time t.

[0013] S53. Using sensitivity indicators, parameters affecting the temperature difference and thermal stress of the irregular steel rail are obtained from the pulse current frequency, pulse heating power, and pulse width sensor distance.

[0014] S54. Based on the main influencing parameters obtained in step S53, including pulse current frequency and pulse heating power, a mapping relationship model between the main influencing parameters and the temperature uniformity and thermal stress after reheating is obtained, and the expression is: ; Where m is the number of neurons in the hidden layer. The weights from the hidden layer to the output layer. Let i be the center vector of the i-th neuron. Let be the kernel width of the i-th neuron, and b be the bias term. This represents the predicted temperature non-uniformity after the first temperature compensation.

[0015] S55. Based on the mapping relationship model obtained in step S54, set the threshold for the second temperature compensation, and determine the temperature points on the irregular steel rail that require the second temperature compensation.

[0016] S56. Perform a second temperature compensation based on the temperature point obtained in step S55. If the temperature difference is less than 100℃ and greater than 30℃, perform the second temperature compensation until the temperature is less than or equal to 30℃. If the deviation is less than or equal to 30℃, the heat treatment at that temperature point is complete. During the second temperature compensation process, continuously monitor the temperature of the special-shaped rail. If the temperature difference of the special-shaped rail is still greater than 100℃, return to step S4.

[0017] Preferably, in step S2, the specific judgment process is as follows: if the pressure between the independent electrode head module and the irregular rail tread is greater than 10N and less than 50N, then proceed to step S3; if the pressure between the independent electrode head module and the irregular rail tread is less than or equal to 10N or greater than or equal to 50N, then continue to use the lifting component to adjust the pressure between the two until it is greater than 10N and less than 50N.

[0018] Preferably, in step S4, the specific implementation process of the first temperature compensation is as follows: first, a low-frequency pulse current with a frequency of 20HZ to 50HZ is applied to the irregular steel rail using an induction coil assembly until the overall thickness of the irregular steel rail is uniformly heated to 825 to 845°C; then, a high-frequency pulse current with a frequency of 10kHz to 50kHz is applied to the irregular steel rail until the temperature difference is lower than the threshold.

[0019] Preferably, in step S51, the transient heat transfer expression for the irregularly shaped rail is: ; Where T(x,y,z,t) is the temperature of the special-shaped rail at time t at the three-dimensional coordinates (x,y,z), ρ is the density of the special-shaped rail, c is the specific heat capacity of the special-shaped rail, and k is the thermal conductivity of the special-shaped rail. The density of the heat source within the induction heating coil assembly. This represents the density of the heat source within the pulse current.

[0020] Preferably, in step S52, the difference between the coil temperature and the average coil temperature at the three-dimensional coordinates (x, y, z) at time t is... Relational expression: ; in, =[fpulse,Ppulse,delec] is the key optimization parameter vector. To be the maximum temperature difference predicted after optimization, The maximum thermal stress predicted after optimization. This is the optimized predicted heat replenishment efficiency.

[0021] Preferably, in step S53, the expression for the sensitivity index is: ; Where p is the parameter to be filtered. Let p be the average sensitivity of the temperature field. Let p be the average sensitivity of parameter to the stress field, and r be the number of Morris samples. Let ΔTj0 be the maximum temperature difference of the irregular-shaped rail after the change of p in the j-th sampling, and let ΔTj0 be the maximum temperature difference of the irregular-shaped rail when p is the baseline value in the j-th sampling. The maximum thermal stress of the irregular-shaped rail after the change of p in the j-th displacement sampling is... The maximum thermal stress of the irregular-shaped rail when p is the baseline value in the j-th sampling is given. Let p be the step size of the change.

[0022] Preferably, in step S55, the expression for determining the temperature point requiring a second temperature compensation is: ; Where (x,y,z) are the three-dimensional coordinates of the irregularly shaped rail. Let (x, y, z) be the temperature difference at coordinates (x, y, z). The threshold for the second temperature compensation. Let (x, y, z) be the maximum thermal stress at coordinates (x, y, z). For stress safety threshold, The effective heating area for the irregularly shaped steel rail is defined by S(x,y,z)=1, which indicates that the point requires secondary heating and provides target coordinates for subsequent electrode position adjustments.

[0023] On the other hand, the present invention provides a pulse current targeted heating device based on a local electromagnetic induction heating method, comprising a base assembly, a three-axis motion assembly, a placement assembly, a lifting assembly, an electrode adjustment assembly, and an induction coil assembly. In the lifting assembly, the output end of the lifting motor is connected to the input end of the fifth ball screw, and the second slide rail sliders are symmetrically arranged at both ends of the fifth ball screw. The slider in the second slide rail slider and the nut in the fifth ball screw are connected to the first end of the fixed frame in the electrode adjustment assembly via a connector. In the electrode adjustment assembly, the output shaft of the motor is connected to the input end of the gear. The gear meshes with the upper rack and the lower rack respectively. The fixed ends of the upper rack and the lower rack are connected through the optical axis and the optical axis fixing plate respectively. The output end of the DC motor is connected to the input end of the drive gear. The drive gear meshes with the gear. The output ends of the drive gear and the gear are connected to the input ends of the first sprocket and the second sprocket respectively. The first sprocket and the second sprocket are connected to the third sprocket and the fourth sprocket respectively through the chain. The output ends of the third sprocket and the fourth sprocket are connected to the input ends of the first pinion and the second pinion respectively. The first pinion and the second pinion are connected to the special rack respectively. The first mounting end and the second mounting end of the independent electrode head module are connected to the fixed end of the slider in the third slide rail and the fixed end of the special rack respectively. The second end of the electrode box cover is equipped with a laser displacement sensor. The graphite electrode head is connected to the fourth mounting end of the motor housing through the electrode sheet.

[0024] Preferably, the three-axis motion assembly includes a stepper motor, a ball screw, a slide rail slider, a transmission gear, a synchronous belt, and a Y-axis adapter plate. The output shaft of the X-axis stepper motor is connected to the input end of the first ball screw. The first slide rail slider is symmetrically arranged at both ends of the first ball screw. The nut end of the first ball screw and the slider end of the first slide rail slider are respectively connected to the first end of the aluminum profile frame. The output end of the Z-axis stepper motor is connected to the input end of the second ball screw through the first transmission gear. The fixed end of the second ball screw is connected to the second end of the aluminum profile frame. The first transmission gear is connected to the second transmission gear through the synchronous belt. The output end of the second transmission gear is connected to the input end of the third ball screw. The nut of the third ball screw is connected to the first end of the Y-axis adapter plate. The second end of the Y-axis adapter plate is connected to the fixed end of the fourth ball screw. The Y-axis stepper motor is connected to the input end of the fourth ball screw 214.

[0025] Preferably, the induction coil assembly includes an induction coil fixing plate, a connecting seat, an infrared thermal imager, a U-shaped magnetic conductor, and a U-shaped cooling water channel. The U-shaped cooling water channel and the U-shaped magnetic conductor are connected. The U-shaped cooling water channel has an inlet and an outlet at one end near the U-shaped magnetic conductor. The induction coil fixing plate is connected to the infrared thermal imager through the connecting seat.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the method of this invention, the pulsed current generates instantaneous Joule heating when passing through the metal, leading to a rapid increase and subsequent cooling of the local temperature. This thermal cycle promotes grain recrystallization, reduces residual stress, and also reduces carbon segregation in the near-surface region, significantly lowering the residual stress gradient; while the internal region of the irregularly shaped rail shows no significant carbon segregation, resulting in more uniform residual stress. Simultaneously, the pulsed current provides supplementary heating to the irregularly shaped rail and strengthens and enhances its metal structure and properties.

[0027] 2. In the device of this invention, the contour heating coil is located on the tread surface and side surface of the rail head of the irregularly shaped rail. The contour heating coil can be customized according to the specific shape of the irregularly shaped rail and the areas to be heated, achieving precise zone heating of different parts such as the forming section, transition section, and heat-affected zone. This helps ensure that each critical area reaches the ideal austenitizing temperature and avoids quality problems caused by local overheating or underheating. At the same time, the contour heating coil can more evenly transfer energy to the rail surface, reduce the temperature gradient, and improve the overall heating quality.

[0028] 3. In this invention, during induction heating, the temperature of the rail head tread surface is higher than that of the side surface. The distance between the pulse current application mechanism and the irregular steel rail is adjusted by the lead screw in the XYZ three-dimensional motion mechanism. The distance between the two graphite rods is adjusted to ensure that the graphite rods are in contact with the steel rail. An auxiliary pulse current is applied to the rail head, so that most of the pulse current is concentrated on the side of the rail head and the irregular steel rail is subjected to heat treatment. At the same time, the metal structure of the rail head can be specifically improved.

[0029] 4. The pulse current-assisted induction heating method of this invention, with its precise temperature control, flexible zone heating characteristics, and high energy utilization rate, effectively solves the problems of uneven temperature distribution, difficult cooling control, high energy consumption, low efficiency, and poor quality stability in the existing heat treatment of irregularly shaped rails. This not only achieves uniform heating and optimized cooling of rails with complex cross-sections, significantly improving the hardness uniformity, wear resistance, and fatigue life of irregularly shaped rails, but also possesses good automation adaptability, facilitating large-scale and intelligent production, and providing a high-performance, long-life rail heat treatment solution for the rail transit industry. Attached Figure Description

[0030] Figure 1 This is a flowchart of the pulsed current targeted heating method based on local electromagnetic induction heating according to the present invention; Figure 2 This is an overall structural diagram of the pulse current targeted heating device based on local electromagnetic induction heating according to the present invention. Figure 3 This is a structural diagram of the triaxial motion component in the pulsed current targeted heating device based on local electromagnetic induction heating of the present invention; Figure 4 This is a structural diagram of the components placed in the pulse current targeted heating device based on local electromagnetic induction heating of the present invention; Figure 5 This is a structural diagram of the lifting component in the pulse current targeted heating device based on local electromagnetic induction heating of the present invention; Figure 6 This is a first partial view of the electrode adjustment assembly in the pulse current targeted heating device based on local electromagnetic induction heating of the present invention. Figure 7 This is a second part view of the electrode adjustment assembly in the pulse current targeted heating device based on local electromagnetic induction heating of the present invention. Figure 8 This is a structural diagram of the induction coil assembly in the pulse current targeted heating device based on local electromagnetic induction heating of the present invention; Figure 9 This is a structural diagram of the irregularly shaped steel rail in the pulsed current targeted heating device based on local electromagnetic induction heating of the present invention.

[0031] Key reference numerals: Base assembly 1, first profile 101, caster wheel 102, power supply 103; Three-axis motion assembly 2, X-axis stepper motor 201, first ball screw 202, first slide rail slider 204, Z-axis stepper motor 205, first transmission gear 206, second ball screw 207, aluminum profile frame 208, synchronous belt 209, second transmission gear 210, third ball screw 211, Y-axis adapter plate 212, Y-axis stepper motor 213, fourth ball screw 214; Placement assembly 3, fiberglass board 301, support frame 302, first support plate 303; Lifting assembly 4, lifting frame 401, lifting motor 402, fifth ball screw 403, second slide rail slider 404, connector 405; Electrode adjustment assembly 5, motor 501, motor fixing plate 502, fixing frame 503, gears. 504, Upper rack 505, Lower rack 506, Optical axis 507, Optical axis fixing plate 508, Electrode housing 509, DC motor 510, Electrode sheet 511, Coupling 512, Drive gear 513, Gear 514, First sprocket 515, Second sprocket 516, Third sprocket 517, Fourth sprocket 518, First pinion 519, Second pinion 520, Special rack 521, Third slide rail slider 522, Independent electrode head module 523, Laser displacement sensor 524, Graphite electrode head 525, Induction coil assembly 6, Induction coil fixing plate 601, Connecting seat 602, Infrared thermal imager 603, U-shaped magnetic conductor 604, U-shaped cooling water channel 605, Inlet 606, Outlet 607, Bottom surface of special-shaped steel rail 7, Tread surface of special-shaped steel rail 8, Side surface of special-shaped steel rail 9. Detailed Implementation

[0032] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0033] A pulsed current targeted heating method based on local electromagnetic induction heating is proposed. This method uses pulsed current-assisted induction heating to remove residual stress from irregularly shaped steel rails. Simultaneously, the pulsed current is used to replenish the heat of the irregularly shaped steel rails and strengthen and improve their metal structure and properties. The structure of the irregularly shaped steel rail is as follows: Figure 9 As shown. Figure 1 As shown, the specific steps include the following: S1. Using the three-axis motion assembly 2, the irregular steel rail located on the placement assembly 3 is moved at a speed of 5-10 mm / s to the bottom of the induction coil assembly 6. The bottom surface 7 of the irregular steel rail contacts the fiberglass board 301. At this time, the distance between the tread surface 8 of the irregular steel rail and the induction coil assembly 6 is 20-50 mm, and the distance between the side surface 9 of the irregular steel rail and the induction coil 6 is 20-50 mm. At the same time, the distance between the independent electrode head modules 523 symmetrically distributed on both sides of the irregular guide rail in the electrode adjustment assembly 5 is adjusted to 100-160 mm.

[0034] S2. Using the lifting assembly 4, the independent electrode head module 523 and the irregular rail tread surface 8 are brought into contact. If the pressure between the independent electrode head module 523 and the irregular rail tread surface 8 is greater than 10N and less than 50N, then proceed to step S3. If the pressure between the independent electrode head module 523 and the irregular rail tread surface 8 is less than or equal to 10N or greater than or equal to 50N, then continue to use the lifting assembly 4 to adjust the pressure between the two until it is greater than 10N and less than 50N.

[0035] S3. Use the induction coil assembly 6 to heat the irregular steel rail for 26 seconds until the temperature of the irregular steel rail reaches 800℃. Record the initial temperature field data of the irregular steel rail using the infrared thermal imager 603, and generate temperature distribution maps of the irregular steel rail tread 8 and the irregular steel rail side 9.

[0036] S4. Subtract the temperature distribution map obtained in step S3 from the preset target temperature curve. If the temperature difference is greater than the threshold of 100℃, the induction coil assembly 6 is used to perform the first temperature compensation on the irregular steel rail. First, a low-frequency pulse current with a frequency of 20HZ to 50HZ is applied to the irregular steel rail using the induction coil assembly 6 until the overall thickness of the irregular steel rail is uniformly heated to 825-845℃. Then, a high-frequency pulse current with a frequency of 10kHz to 50kHz is applied to the irregular steel rail until the temperature difference is lower than the threshold and the temperature data is recorded. The strong penetrating power of the low-frequency current ensures that the temperature inside and on the top surface of the irregular steel rail rises uniformly. The high-frequency pulse current improves the heating efficiency of the irregular steel rail surface by means of the current skin effect, further reducing the temperature difference and completing the first temperature compensation of the pulse current. If the temperature difference is less than or equal to the threshold of 100℃, the temperature data is recorded directly.

[0037] S5. Based on the temperature data obtained in step S4, an induction heating model for the irregular-shaped rail is established. Key parameters affecting the temperature distribution and stress field changes of the irregular-shaped rail are obtained, and these key parameters are optimized and adjusted. Based on the adjusted results, the longitudinal relative position of the independent electrode head module 523 is controlled. The longitudinal relative position of the independent electrode head modules 523, symmetrically distributed on both sides of the irregular-shaped rail, is used to perform a second temperature compensation on the irregular-shaped rail. The specific implementation process is as follows: S51. Establish the transient heat transfer expression for irregularly shaped steel rails: ; in, Let be the temperature of the irregularly shaped rail at time t (x, y, z), ρ be the density of the irregularly shaped rail, c be the specific heat capacity of the irregularly shaped rail, and k be the thermal conductivity of the irregularly shaped rail. The density of the heat source within the induction heating coil assembly. This represents the density of the heat source within the pulse current.

[0038] S52. Based on step S51, and combining parameters such as the number of turns of the coil in the induction coil assembly 6, the wire diameter of the coil, and the distance between the coil and the irregular steel rail, an optimized expression is established for the difference between the coil temperature and the average coil temperature at the three-dimensional coordinates (x, y, z) at time t: ; in, =[fpulse,Ppulse,delec] is the key optimization parameter vector. To be the maximum temperature difference predicted after optimization, The maximum thermal stress predicted after optimization. To optimize the predicted heat replenishment efficiency. Furthermore, From step S51 The result is obtained by taking the maximum absolute value of the difference between the node temperature and the global average temperature. Depend on It is derived from the thermo-elastic-plastic constitutive relation. The difference between the maximum temperature difference before and after reheating, obtained from step S51, is divided by the maximum temperature difference before reheating.

[0039] S53. Using sensitivity indicators, parameters such as pulse current frequency, pulse heating power, and pulse width, as well as the distance between the sensor and the irregular-shaped rail, are used to obtain parameters affecting the temperature difference and thermal stress of the irregular-shaped rail. The expression for the sensitivity indicator is: ; Where p is the parameter to be filtered. Let p be the average sensitivity of the temperature field. Let p be the average sensitivity of parameter to the stress field, and r be the number of samples. The maximum temperature difference of the irregular-shaped rail after the change of p in the j-th sampling is given. The maximum temperature difference of the irregular-shaped rail when p is the baseline value in the j-th sampling. The maximum thermal stress of the irregular-shaped rail after the change of p in the j-th sampling is given. The maximum thermal stress of the irregular-shaped rail when p is the baseline value in the j-th sampling is given. Let p be the step size of the change. Furthermore, , , , All are obtained from the temperature field solved in step S51. From step S52 Parameter range setting.

[0040] S54. Based on the influencing parameters obtained in step S53, including the pulse current frequency and pulse heating power, a mapping relationship model between the main influencing parameters and the temperature uniformity and thermal stress after reheating is obtained, and the expression is: ; Where m is the number of neurons in the hidden layer. The weights from the hidden layer to the output layer. Let i be the center vector of the i-th neuron. Let be the kernel width of the i-th neuron, and b be the bias term. This represents the predicted temperature non-uniformity after the first heating cycle.

[0041] Specifically, the mapping relationship model is based on the input vector. (Corresponding to the temperature difference and pulse frequency before reheating), combined with the center vector of the hidden layer neurons. Weight and kernel width Output temperature non-uniformity after heat compensation The expression for the input vector is: ; in, The temperature difference before reheating the irregularly shaped steel rails. This refers to the low-frequency frequency of the pulse current in the induction coil assembly. This refers to the low-frequency frequency of the pulse current in the induction coil assembly. This is the initial heating power. This is the initial heating time. Furthermore, The temperature field obtained in step S51 is used to calculate the difference between the temperature at each point and the average temperature. Corresponding to step S52 fpulse, Corresponding to Ppulse.

[0042] S55. Based on the mapping relationship model obtained in step S54, set the threshold for the second temperature compensation. The threshold is when the temperature deviates from the average temperature by more than 30℃ and the thermal stress exceeds 240MPa. Then, determine the temperature points on the irregularly shaped rails that require the second temperature compensation. The expression is: ; Where (x,y,z) are the three-dimensional coordinates of the irregularly shaped rail. Let (x, y, z) be the temperature difference at coordinates (x, y, z). The threshold for the second temperature compensation. Let (x, y, z) be the maximum thermal stress at coordinates (x, y, z). For stress safety threshold, For the effective heating area of ​​the irregularly shaped steel rail, S(x,y,z)=1 indicates that this point requires secondary heating, providing target coordinates for subsequent electrode position adjustment. Furthermore, Solved by step S51 The difference between the temperature at this point and the average temperature before the second heating is calculated. Combined with step S54 set up, Solved by step S51 Based on the thermo-elastic-plastic constitutive relation, From step S52 The spacing of the independent electrode head module 523 is determined by the spacing of the electrode head module 523.

[0043] S56. Perform a second temperature compensation based on the temperature point obtained in step S55. When the temperature difference is less than 100℃ and greater than 30℃, perform the second temperature compensation based on the mapping relationship model constructed in step S54, combined with the main influencing parameters in the induction coil assembly 6 selected in step S53 and the adjustment of the spacing of the independent electrode head module 523. If the deviation is less than or equal to 30℃, it is determined that the heat treatment of the temperature point is completed. During the second temperature compensation process, the temperature of the irregular steel rail is continuously monitored. If the temperature difference of the irregular steel rail is still greater than 100℃, step S4 is repeated. The heat compensation process can be accurately located by the independent electrode head module 523 in the abnormal area.

[0044] This invention applies a pulsed current to remove residual stress within the irregularly shaped rail while simultaneously induction heating it. By synchronously arranging induction coil assemblies 6 on the tread surface 8 and side surface 9 of the irregularly shaped rail, the heating contact area is significantly increased, and the magnetic flux density per unit area is enhanced, thereby improving the heating efficiency of the irregularly shaped rail per unit time. During induction heating, due to the combined effects of heat conduction and skin effect, temperature differences exist between different parts of the irregularly shaped rail and the irregular transition section. The distance between the electrode adjustment assembly 5 and the irregularly shaped rail is adjusted by the lifting assembly 4, and the spacing of the independent electrode head modules 523 symmetrically arranged on both sides of the irregularly shaped rail is adjusted by the gears and racks in the electrode moving platform of the electrode adjustment assembly 5, ensuring that the spacing of the independent electrode head modules 523 does not affect the normal heating of the induction coil assembly 6. Applying an auxiliary pulsed current to the irregularly shaped rail while electromagnetically heating allows most of the pulsed current to concentrate on the side surface 9 and the irregular transition section of the rail, ultimately strengthening the area in direct contact with the train wheel disc.

[0045] A pulsed current targeted heating method device based on local electromagnetic induction heating, such as Figure 2As shown, the assembly includes a base assembly 1, a three-axis motion assembly 2, a placement assembly 3, a lifting assembly 4, an electrode adjustment assembly 5, and an induction coil assembly 6. The base assembly 1 is an integral support frame used to fix and support the various functional components. The three-axis motion assembly 2 is mounted on the base assembly 1 and is used to achieve precise positioning and movement of the irregular steel rail in the X, Y, and Z directions. The placement assembly 3 is used to place and support the irregular steel rail to be processed. The lifting assembly 4 can move up and down in the vertical direction to adjust the height of the electrode adjustment assembly 5. The electrode adjustment assembly 5 is connected to the lower end of the lifting assembly 4 and is used to apply multi-frequency pulse current to the tread surface of the irregular steel rail to achieve layered heating.

[0046] Base component 1, such as Figure 2 As shown, it includes a caster wheel 102, a power supply 103, and a first profile 101. The first profile 101 forms the base body through corner brackets. The caster wheel 102 is located at the lower end of the base body, and the power supply 103 is located inside the base body.

[0047] The XYZ directions of the three-axis motion component 2 are as follows: Figure 3 As shown, the system includes an X-axis stepper motor 201, a first ball screw 202, a first slide rail slider 204, a Z-axis stepper motor 205, a first transmission gear 206, a second ball screw 207, an aluminum profile frame 208, a synchronous belt 209, a second transmission gear 210, a third ball screw 211, a Y-axis adapter plate 212, a Y-axis stepper motor 213, and a fourth ball screw 214. The output shaft of the X-axis stepper motor 201 is connected to the input end of the screw in the first ball screw 202. The first slide rail slider 204 is symmetrically arranged at both ends of the first ball screw 202. The nut end of the first ball screw 202 and the slider end of the first slide rail slider 204 are respectively connected to the first... The Z-axis stepper motor 205 is connected to the input end of the first transmission gear 206 and the second ball screw 207. The fixed end of the second ball screw 207 is connected to the second end of the aluminum profile frame 208. The first transmission gear 206 is connected to the second transmission gear 210 via the synchronous belt 209. The output end of the second transmission gear 210 is connected to the input end of the third ball screw 211. The nut in the third ball screw 211 is connected to the first end of the Y-axis adapter plate 212. The second end of the Y-axis adapter plate 212 is connected to the fixed end of the fourth ball screw 214. The Y-axis stepper motor 213 is connected to the input end of the fourth ball screw 214.

[0048] Place component 3, such as Figure 4 As shown, it includes a fiberglass board 301, a support frame 302 and a first support plate 303. The fiberglass board 301 is connected to the first end of the support frame 302 and the first support plate 303. The second end of the first support plate 303 is connected to the fixed end of the nut in the fourth ball screw 214.

[0049] Lifting component 4, such as Figure 5 As shown, the assembly includes a lifting frame 401, a lifting motor 402, a fifth ball screw 403, a second slide rail slider 404, and a connector 405. The first fixed end of the lifting frame 401 is connected to the third end of the aluminum profile frame 208 in the three-axis motion assembly 2. The fixed end of the lifting motor 402 is connected to the second fixed end of the lifting frame 401. The output end of the lifting motor 402 is connected to the input end of the screw in the fifth ball screw 403. The second slide rail slider 404 is symmetrically arranged at both ends of the fifth ball screw 403. The slider in the second slide rail slider 404 and the nut in the fifth ball screw 403 are connected to the first end of the fixed frame 503 in the electrode adjustment assembly 5 through the connector 405.

[0050] Electrode adjustment component 5, such as Figure 6 and Figure 7 As shown, the device includes a motor 501, a motor mounting plate 502, a mounting frame 503, a gear 504, an upper rack 505, a lower rack 506, an optical axis 507, an optical axis mounting plate 508, an electrode housing 509, a DC motor 510, an electrode sheet 511, a coupling 512, a drive gear 513, a large gear 514, a first sprocket 515, a second sprocket 516, a third sprocket 517, a fourth sprocket 518, a first pinion 519, a second pinion 520, a special rack 521, a third slide rail slider 522, an independent electrode head module 523, a laser displacement sensor 524, and a graphite electrode head 525. The motor 501, gear 504, upper rack 505, lower rack 506, optical axis 507, and optical axis mounting plate 508 form an electrode moving platform. Figure 6 As shown; the electrode housing 509, DC motor 510, electrode plate 511, coupling 512, drive gear 513, gear 514, first sprocket 515, second sprocket 516, third sprocket 517, fourth sprocket 518, first pinion 519, second pinion 520, special rack 521, third slide rail slider 522, independent electrode head module 523, laser displacement sensor 524, and graphite electrode head 525 constitute an independently movable electrode assembly, such as... Figure 7 As shown.

[0051] The fixed end of the motor 501 is connected to the second end of the motor fixing plate 502 and the fixing frame 503. The output shaft of the motor 501 is connected to the input end of the gear 504. The gear 504 meshes with the upper rack 505 and the lower rack 506 respectively. The fixed ends of the upper rack 505 and the lower rack 506 are connected to the optical shaft 507 and the optical shaft fixing plate 508 respectively. The connecting ends of the upper rack 505 and the lower rack 506 are connected to the first mounting end of the motor housing 509 respectively through the connecting sheet metal.

[0052] The fixed end of the DC motor 510 is connected to the second mounting end of the motor housing 509. The output end of the DC motor 510 is connected to the input end of the drive gear 513 via a coupling 512. The drive gear 513 and gear 514 are meshed together. The output ends of the drive gear 513 and gear 514 are respectively connected to the input ends of the first sprocket 515 and the second sprocket 516. The first sprocket 515 and the second sprocket 516 are respectively connected to the third sprocket 517 and the fourth sprocket 518 via a chain. The output ends of the third sprocket 517 and the fourth sprocket 518 are respectively connected to the first pinion 519 and the second pinion 520. The input end is connected, the first pinion 519 and the second pinion 520 are respectively connected to the special rack 521, the fixed end of the slide rail in the third slide rail slider 522 is connected to the third mounting end of the motor housing 509, the first mounting end and the second mounting end of the independent electrode head module 523 are respectively connected to the fixed end of the slider in the third slide rail slider 522 and the fixed end of the special rack 521, the third mounting end of the motor housing 509 is connected to the first end of the electrode box cover, the second end of the electrode box cover is provided with a laser displacement sensor 524, and the graphite electrode head 525 is connected to the fourth mounting end of the motor housing 509 through the electrode plate 511.

[0053] The longitudinal adjustment method of the independent movable electrode assembly is as follows: a DC motor 510 drives a large drive gear 513, a large drive gear 514, a first sprocket 515, and a second sprocket 516 via a coupling 512. The first sprocket 515 and the second sprocket 516 drive a third sprocket 517 and a fourth sprocket 518 via a chain. The chain drives a small gear coaxial with the sprockets to rotate. The small gear drives a specially designed rack 521 to achieve longitudinal position adjustment of the independent electrode head module 523 on both sides of the irregular steel rail. The symmetrically distributed and coupled drive gears 513 and 514 enable one DC motor to drive the symmetrical longitudinal position adjustment of two independent electrode head modules 523, achieving precise pulse current heating at specific locations. The independent electrode head module 523 incorporates a pressure sensor, a positioning module, an electrode head telescopic structure, and a manual electrode head telescopic structure.

[0054] Induction coil assembly 6, such as Figure 8 As shown, the assembly includes an induction coil mounting plate 601, a connecting seat 602, an infrared thermal imager 603, a U-shaped magnetic conductor 604, and a U-shaped cooling water channel 605. The U-shaped cooling water channel 605 and the U-shaped magnetic conductor 604 are connected. The induction coil assembly 6 has a circulating water structure. The U-shaped cooling water channel 605 has an inlet 606 and an outlet 607 at one end near the U-shaped magnetic conductor 604. The inlet 606 and the outlet 607 are respectively located on both sides of the U-shaped cooling water channel 605. The circulating water system can be connected to an external cooling water source. The induction coil mounting plate 601 is connected to the infrared thermal imager 603 through the connecting seat 602.

[0055] When in operation, the induction coil assembly 6 is positioned on the tread surface 8 and side surface 9 of the irregular-shaped rail, with the winding direction of the induction coil assembly 6 perpendicular to the length direction of the irregular-shaped rail. The induction coil assembly 6 is connected to an external power source via positive and negative electrode plates. The induction coil assembly 6 consists of two groups connected in series. The shape of the induction coil assembly 6 matches the outer contour of the irregular-shaped rail, with a spacing not exceeding 20mm at any point. The induction coil assembly 6 is U-shaped, employing a contoured coil similar to the shape of the irregular-shaped rail, which increases the induction heating area of ​​the irregular-shaped rail, increases the magnetic flux density per unit area, and improves the heating efficiency of the irregular-shaped rail per unit time, meeting the requirements of mass production.

[0056] The control unit of the device of this invention includes a data acquisition and analysis module, a parameter adjustment module, and a PID control module. The data acquisition and analysis module is used to collect position data, pressure data, temperature data, current data, and electrode spacing data of the irregularly shaped steel rail, and to process and analyze the collected data. The parameter adjustment module calculates the optimal heating scheme based on the data provided by the data acquisition and analysis module. The PID control module controls the equipment to perform the heating action according to the parameters provided by the parameter adjustment module. The key parameters are those critical to the temperature field distribution and stress field changes of the irregularly shaped steel rail, specifically including the frequency of the electromagnetic induction heater, the current density passing through the irregularly shaped steel rail, the moving speed of the irregularly shaped steel rail, the pulse adjustment strategy, the pulse current frequency change rate, and the current change mode.

[0057] The heat compensation algorithm is a key component in addressing the uneven temperature distribution across complex cross-sections of irregularly shaped steel rails. Its core functions include: supporting parameter rendering and status management within a multi-module visualization interface; real-time display of the heating temperature field, equipment operating parameters, and energy efficiency data for the irregularly shaped steel rail; driving the coordinated movement of the three-axis motion component 2, lifting component 4, and electrode adjustment component 5 to achieve precise positioning and dynamic current application of the irregularly shaped steel rail; collecting and structuredly analyzing comprehensive process data such as temperature, pressure, current, and energy efficiency; and using a built-in intelligent algorithm module to filter key parameters, predict heating effects, and solve for the optimal process solution. The heat compensation algorithm is mainly divided into three modules: a data acquisition and analysis module, a parameter adjustment module, and a PID control module. Each module of the heat compensation algorithm spans multiple process stages, forming a closed-loop process.

[0058] The core function of the data acquisition and analysis module is to collect, process, and analyze data throughout the entire process, providing data raw materials for other code modules. The module acquires the position data of the irregular-shaped rail using the laser displacement sensor 524, processes the data, and determines the relative position of the irregular-shaped rail and the induction coil assembly 6. This provides data support for the three-axis motion assembly 2, enabling it to adjust its position to ensure that the distance between the irregular-shaped rail tread and the induction coil assembly 6 is 20-50mm, and the distance between the side of the irregular-shaped rail and the induction coil assembly 6 is also 20-50mm. The module also acquires pressure data from the pressure sensor, determining whether the pressure is greater than 10N and less than 50N. If the pressure is less than 10N or greater than 50N, the data is fed back to the PID control module to adjust the pressure. Finally, the module acquires real-time temperature data of the irregular-shaped rail surface using an infrared thermal imager 603, repairs defects through neighborhood interpolation, smooths the data using Kalman filtering, and generates a temperature field distribution map. Next, the infrared thermal imager 603 is used to acquire real-time temperature images of the heated irregular-shaped rail. A grayscale-temperature mapping algorithm is then used to generate temperature distribution maps of the irregular-shaped rail tread (8) or side surface (9), by assigning different shades of grayscale to different temperatures. The data acquisition and analysis module utilizes the infrared thermal imager 603 to rapidly acquire near-surface temperature changes, pulse current waveforms from the current sensor, and electrode spacing data from the position sensor.

[0059] The core function of the parameter adjustment module is to generate optimal parameters based on data. Based on the temperature difference data and initial current-temperature parameters provided by the data acquisition and analysis module, the module calculates the optimal heating scheme. The data is then used to predict parameters via an OLHD-RBF neural network (Optimal Latin Hypercubic-Radial Basis Function Neural Network), followed by parameter optimization using the MIGA algorithm (Multi-Island Genetic Algorithm). This optimization can be applied at frequencies ranging from 500-200Hz for low frequencies and 10-50kHz for high frequencies, outputting the core current parameters for the first temperature compensation. Next, the module uses the temperature distribution map and the data acquired after the first temperature compensation from the data acquisition and analysis module. It then uses the MIGA algorithm to optimize the parameters and combine this with location data to select hot spots for the second temperature compensation. Finally, it outputs the optimal parameters for the second temperature compensation and transmits these optimized parameters to the PID control module for the second temperature compensation.

[0060] The core function of the PID control module is to translate optimized parameters into device actions, driving hardware operation. The PID control module receives the position data of the irregularly shaped rail from the data acquisition and analysis module, generates a fifth-order polynomial motion trajectory using the PathPlanner class (motion trajectory planning class) in the code, and controls the stepper motor in the three-axis motion component 2 using the Modbus-RTU protocol. With a repeatability error of <1mm, it precisely displaces the irregularly shaped rail below the induction coil component 6, maintaining a distance of 20-50mm between the rail tread surface 8 and the induction coil component 6, and a distance of 20-50mm between the rail side 9 and the induction coil component 6. The PID control module also receives pressure data from the data acquisition and analysis module, calculates the motor speed using the PIDController class (PID controller class) in the code, and adjusts the electrode height accordingly to stabilize the pressure at the target value ±5N. Upon receiving the parameters for the first temperature compensation, the PID control module sends a command to the pulse current transposer via the CAN bus, controlling the current output accuracy to ±0.3% FS. Simultaneously, it drives the independent electrode head module 523 to maintain alignment with the abnormal area within the irregularly shaped rail, ensuring precise and efficient heat compensation. The PID control module then receives the parameters for the second temperature compensation from the parameter adjustment module. The PID controller then moves the DC motor 510 to move the independent electrode head module 523, precisely positioning the electrode at the heat compensation point and completing the accurate heat compensation.

[0061] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method of pulsed current targeted heat addition based on local electromagnetic induction heating, characterized in that, The specific steps are as follows: S1, use the three-axis motion assembly to run the special-shaped rail located on the placing assembly to the lower side of the induction coil assembly, adjust the distance between the special-shaped rail and the induction coil assembly, and adjust the distance between the independent electrode head module at the same time; S2, use the lifting assembly to contact the independent electrode head module and the special-shaped rail tread, and judge the pressure therebetween; when the pressure meets the requirements, proceed to step S3; S3, use the induction coil assembly to heat the special-shaped rail until the temperature reaches 800 DEG C, and record and generate the temperature distribution diagram of the special-shaped rail tread and the side of the special-shaped rail through the infrared thermal imager; S4, difference between the temperature distribution curve obtained in step S3 and the preset target temperature curve; if the temperature difference is greater than the threshold value 100 DEG C, first temperature compensation is performed and the temperature data is recorded; if the temperature difference is less than or equal to the threshold value 100 DEG C, the temperature data is directly recorded; S5, according to the temperature data obtained in step S4, an induction heating model of the special-shaped rail is established, and the specific process is as follows: S51, establish the transient heat transfer expression of the special-shaped rail; S52, on the basis of step S51, combine the number of turns of the coil, the wire diameter of the coil and the distance between the coil and the special-shaped rail in the induction coil assembly to establish the relationship between the temperature difference of the coil at t time and the average temperature of the coil at t time; S53, use the sensitivity index to obtain the influence parameters of the temperature difference and the thermal stress of the special-shaped rail from the pulse current frequency, the pulse heating power and the pulse width of the inductor and the distance between the special-shaped rail; S54, according to the main influence parameters obtained in step S53, including the pulse current frequency and the pulse heating power, the mapping relationship model between the main influence parameters and the temperature uniformity after heat compensation and the thermal stress is obtained, and the expression is as follows: ； where m is the number of hidden layer neurons, is the weight from the hidden layer to the output layer, is the center vector of the i-th neuron, is the kernel width of the i-th neuron, and b is the bias term, is the predicted temperature non-uniformity after the first temperature compensation; S55, according to the mapping relationship model obtained in step S54, set the threshold value of the second temperature compensation, and judge the temperature points of the special-shaped rail which need to be compensated for the second time; S56, according to the temperature points obtained in step S55, perform the second temperature compensation; when the temperature difference is less than 100 DEG C and greater than 30 DEG C, the second temperature compensation is performed until the temperature is less than or equal to 30 DEG C; if the deviation is less than or equal to 30 DEG C, the heat treatment of the temperature point is completed; in the process of the second temperature compensation, the temperature of the special-shaped rail is continuously monitored; if the temperature difference of the special-shaped rail is still greater than 100 DEG C, return to step S4.

2. The method of claim 1, wherein the method is a method of pulsed current targeted heat addition based on local electromagnetic induction heating. In step S2, the specific judgment process is as follows: if the pressure between the independent electrode head module and the special-shaped rail tread is greater than 10 N and less than 50 N, proceed to step S3; if the pressure between the independent electrode head module and the special-shaped rail tread is less than or equal to 10 N or greater than or equal to 50 N, continue to adjust the pressure between the two by using the lifting assembly until it is greater than 10 N and less than 50 N.

3. The method of claim 2, wherein the method is a method of pulsed current targeted heat addition based on local electromagnetic induction heating. In step S4, the specific implementation process of the first temperature compensation is: first, the induction coil assembly is used to apply a low-frequency pulse current with a frequency of 20-50 Hz to the special-shaped steel rail, until the overall thickness of the special-shaped steel rail is uniformly heated to 825-845℃, then a high-frequency pulse current with a frequency of 10-50 kHz is applied to the special-shaped steel rail, until the temperature difference is less than the threshold value.

4. The method of claim 1, wherein the method is a method of localized electromagnetic induction heating based pulse current targeted reheat, further comprising: In step S51, the transient heat transfer expression of the special-shaped steel rail is: ； Wherein, T(x, y, z, t) is the temperature of the special-shaped steel rail at the three-dimensional coordinate (x, y, z) at time t, p is the density of the special-shaped steel rail, c is the specific heat capacity of the special-shaped steel rail, k is the thermal conductivity of the special-shaped steel rail, is the density of the internal heat source of the induction heating coil assembly, is the density of the internal heat source of the pulse current.

5. The method of claim 1, wherein the method is a method of localized electromagnetic induction heating based pulse current targeted reheat, further comprising: In step S52, the difference between the coil temperature and the coil average temperature at the three-dimensional coordinates (x, y, z) at time t is calculated. The relationship expression: ； wherein, = [fpulse, Ppulse, delec] is the vector of key optimization parameters, is the maximum temperature difference of the prediction after optimization, is the maximum thermal stress of the prediction after optimization, is the heat compensation efficiency of the prediction after optimization.

6. The method of claim 1, wherein the method is a method of localized electromagnetic induction heating based pulse current targeted reheat, further comprising: In step S53, the sensitivity index expression is: ； wherein p is a parameter to be screened, is the average sensitivity of the temperature field to the parameter p, is the average sensitivity of the stress field to the parameter p, and r is the number of Morris sampling, is the maximum temperature difference of the profiled rail after the change of the parameter p in the jth sampling, and ΔTj0 is the maximum temperature difference of the profiled rail when the parameter p is the reference value in the jth sampling, is the maximum thermal stress of the profiled rail after the change of the parameter p in the jth sampling, is the maximum thermal stress of the profiled rail when the parameter p is the reference value in the jth sampling, is the change step of the parameter p.

7. The method of claim 1, wherein the method is a method of localized electromagnetic induction heating based pulse current targeted reheat, further comprising: In step S55, the expression for judging the temperature point that needs to be compensated for the second time is: ； where (x, y, z) is the three-dimensional coordinate of the profiled rail, is the temperature difference at coordinate (x, y, z), is the threshold of the second temperature compensation, is the maximum thermal stress at coordinate (x, y, z), is the stress safety threshold, is the effective heating area of the profiled rail, S(x, y, z) = 1 indicates that the point needs secondary heating, and provides target coordinates for subsequent electrode position adjustment.

8. A local electromagnetic induction heating based pulsed current targeted heat supplementing device for use in the local electromagnetic induction heating based pulsed current targeted heat supplementing method according to any one of claims 1 to 7, characterized in that: It comprises a base assembly, a three-axis motion assembly, a placing assembly, a lifting assembly, an electrode adjusting assembly and an induction coil assembly; In the lifting assembly, the output end of the lifting motor is connected with the input end of the screw rod in the fifth ball screw, and the second slide rail sliders are symmetrically arranged at the two ends of the fifth ball screw, and the slider in the second slide rail slider is connected with the nut in the fifth ball screw through the connecting piece and the first end of the fixed frame in the electrode adjusting assembly; In the electrode adjusting assembly, the output shaft of the motor is connected with the input end of the gear, the gear is respectively engaged with the upper rack and the lower rack, the fixed ends of the upper rack and the lower rack are respectively connected through the optical shaft and the optical shaft fixing plate, the output end of the DC motor is connected with the input end of the driving gear, the driving gear is engaged with the gear, the output ends of the driving gear and the gear are respectively connected with the input ends of the first sprocket and the second sprocket, the first sprocket and the second sprocket are respectively connected with the third sprocket and the fourth sprocket through the chain, the output ends of the third sprocket and the fourth sprocket are respectively connected with the input ends of the first pinion and the second pinion, the first pinion and the second pinion are respectively connected with the special rack, the first mounting end and the second mounting end of the independent electrode head module are respectively connected with the fixed end of the slider in the third slide rail slider and the fixed end of the special rack, the second end of the electrode box cover is provided with a laser displacement sensor, and the graphite electrode head is connected with the fourth mounting end of the electrode box through the electrode sheet and the motor box.

9. The localized electromagnetic induction heating based pulsed current targeted reheat device of claim 8, wherein: The three-axis motion assembly comprises a stepping motor, a ball screw, a slide rail slider, a transmission gear, a synchronous belt and a Y-direction adapter plate, the output shaft of the X-direction stepping motor is connected with the input end of the screw rod in the first ball screw, the first slide rail sliders are symmetrically arranged at the two ends of the first ball screw, and the nut end of the first ball screw and the slider end of the first slide rail slider are respectively connected with the first end of the aluminum profile frame, the output end of the Z-direction stepping motor is connected with the input end of the screw rod in the second ball screw through the first transmission gear, the fixed end of the screw rod in the second ball screw is connected with the second end of the aluminum profile frame, the first transmission gear is connected with the second transmission gear through the synchronous belt, the output end of the second transmission gear is connected with the input end of the screw rod in the third ball screw, the nut in the third ball screw is connected with the first end of the Y-direction adapter plate, the second end of the Y-direction adapter plate is connected with the fixed end of the screw rod in the fourth ball screw, and the Y-direction stepping motor is connected with the input end of the screw rod in the fourth ball screw.

10. The localized electromagnetic induction heating based pulse current targeted reheat device according to claim 8, wherein: The induction coil assembly comprises an induction coil fixing plate, a connecting seat, an infrared thermal imager, a U-shaped magnet conductor and a U-shaped cooling water channel, the U-shaped cooling water channel is connected with the U-shaped magnet conductor, the U-shaped cooling water channel is respectively provided with a water inlet and a water outlet at one end close to the U-shaped magnet conductor, and the induction coil fixing plate is connected with the infrared thermal imager through the connecting seat.

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