Non-uniform layout optimization method for layout-adjustable heating body group structure

Abstract

The invention provides a non-uniform layout optimization method for a layout-adjustable heating body group structure, and relates to the technical field of vacuum furnaces. Comprising but not limited to indexes such as in-furnace temperature uniformity, workpiece temperature uniformity, in-furnace maximum energy efficiency ratio, workpiece surface heat flux density and the like. Comprising but not limited to optimization of heating body layout parameters of the vacuum sintering furnace, and optimal heating body group layout parameters meeting a target function and boundary conditions can be obtained through the method. After the optimal heating body layout parameters meeting the objective function and the boundary condition are obtained through the heating body non-uniform layout parameter optimization method based on the neural network, the length of the heating body can be dynamically adjusted through the adjustable heating body group.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum furnaces, in particular to a non-uniform layout optimization method for a layout-adjustable heating body group structure. Background Art

[0002] Silicon carbide is a very important semiconductor device, widely used in aerospace, integrated circuits and other fields. The preparation of silicon carbide workpieces is mainly achieved by reactive sintering process, and its production process mainly goes through mixing, pressing, dewaxing and pre-burning, placing silicon cakes, vacuum sintering, grinding and desiliconization, drying, sintering samples and other processing processes. Among them, vacuum sintering is particularly critical, and energy consumption accounts for about 60% of the entire process.

[0003] At present, the main vacuum sintering equipment is the vacuum sintering furnace, in which the heating chamber is the sintering place of the silicon carbide workpiece. The heating chamber provides a uniform temperature environment for the silicon carbide workpiece, which is conducive to the densification of the silicon carbide workpiece at a lower temperature and in a shorter time, thereby avoiding the adverse effects of high-temperature decomposition and abnormal grain growth on the material.

[0004] The layout of the heating body in the heating chamber directly affects the temperature distribution in the furnace, and the temperature distribution in the furnace and the distribution characteristics of the heating body will directly affect the quality of the sintered silicon carbide workpiece. Therefore, the layout design of the heating body in the sintering furnace is an important prerequisite for ensuring the high-quality sintering of silicon carbide workpieces in the vacuum sintering furnace.

[0005] Regarding the above-mentioned related technologies, in the prior art, the heating bodies are usually kept at a certain interval and evenly arranged in a rectangular distribution around the vacuum furnace cavity to form a group of heating bodies; and the heating body group is symmetrically installed under the premise of keeping a certain distance in the vacuum sintering furnace. However, due to the existence of some pores, cracks and limitations of sealing technology near the furnace doors on both sides, there is a large heat loss near the furnace doors on both sides, which makes the temperature distribution in the furnace show a large temperature difference between the furnace doors on both sides and the interior, and the temperature uniformity is not good. The space near the furnace doors on both sides cannot be effectively used for the reaction sintering of silicon carbide workpieces, resulting in a waste of space in the furnace, which to a certain extent limits the number of products produced by the vacuum sintering process and the utilization of the thermal efficiency level of the vacuum sintering furnace. In addition, due to the limitations of the conductive bracket and the electrode lead, the layout position of the heating body group cannot usually be adjusted.

[0006] Chinese patent CN114492079A proposes a method for optimizing a silicon carbide vacuum sintering furnace based on computational heat transfer simulation. According to the parameters of the vacuum sintering furnace body, a thermal radiation and heat conduction model of the vacuum sintering furnace during the heating process is established; computational heat transfer simulation is performed to optimize the original furnace type. However, when faced with a large amount of data such as different furnace types and a large number of different heating body layout parameters, the adjustment of each parameter of the Ansys Fluent calculation model requires re-gridding, and a lot of time is required for iterative calculation. The calculation speed of the result will be particularly slow and the time complexity is high.

[0007] Chinese patent CN203782277U proposes a birdcage-type circular graphite heating body with multiple slots for high-temperature vacuum furnaces. Since the heating body layout parameters are fixed and cannot be adjusted, when the temperature uniformity in the furnace is poor after installation, or other desired indicators cannot be achieved, the heating body layout parameters of the heating system cannot be adjusted according to the actual situation. Summary of the invention

[0008] In view of the shortcomings of the prior art, the present invention aims to provide a non-uniform layout optimization method for a heating body group structure with adjustable layout, comprising:

[0009] Step 1: Based on the four groups of heating body groups, the heating process of the workpiece in the vacuum sintering furnace is simulated to obtain temperature data, wherein the temperature data includes the average temperature in the vacuum furnace, the average temperature of multiple cross sections of the heating chamber in the vacuum furnace, the average temperature of the entire workpiece, the temperature of each temperature measurement point on the workpiece, and the initial temperature of the workpiece;

[0010] Step 2: Calculate the temperature uniformity σ in the furnace, the temperature variability ε of the sintered workpiece, the maximum energy efficiency ratio η in the furnace, and the heat flux density Q / A on the surface of the workpiece based on the temperature data; take the temperature uniformity σ in the furnace, the temperature variability ε of the sintered workpiece, the maximum energy efficiency ratio η in the furnace, and the heat flux density Q / A on the surface of the workpiece as output samples, and take the layout parameters of the four groups of heating bodies as input samples, the output samples and the input samples constitute training samples, and multiple training samples constitute a training sample set;

[0011] Step 3: Train the CNN neural network model based on the training sample set to obtain a performance parameter optimization model;

[0012] Step 4: According to the preset value ranges of the layout parameters of the four groups of heating bodies, real number coding is used to randomly generate an initial population containing 10,000 layout parameters, and a chaotic genetic algorithm is used to add a chaotic factor, set the chaotic immigration ratio, and the number of iterations, and screen the initial population to obtain the target population;

[0013] Step 5: Based on the performance parameter optimization model, one or more target parameters are determined in the target population, and layout parameters corresponding to the target parameters are obtained. Based on the layout parameters of the four groups of heaters, the layout of the four groups of heaters in the heater group structure with adjustable layout is adjusted.

[0014] Optionally, in step 2, the temperature uniformity σ in the furnace, the temperature variability ε of the sintered workpiece, the maximum energy efficiency ratio η in the furnace, and the heat flux density Q / A on the workpiece surface are calculated based on the temperature data by the following formula:

[0015]

[0016] in, is the average temperature in the vacuum furnace, T i is the average temperature of the i-th section of the heating chamber in the vacuum furnace, n is the number of sections;

[0017]

[0018] in, represents the average temperature of the entire workpiece, N represents the number of temperature measurement points taken on the workpiece, T j Represents the temperature of the jth temperature measurement point of the workpiece;

[0019]

[0020] Among them, c g represents the specific heat capacity of the workpiece, represents the average temperature of the entire workpiece, T0 represents the initial temperature of the workpiece, ρ g Indicates the density of the workpiece, V g represents the volume of the workpiece, P represents the furnace heating power, t s Indicates the heating time;

[0021] Q / A=P1 / A;

[0022] Among them, P1 is the heat power absorbed or emitted by the workpiece, and A is the surface area of ​​the workpiece.

[0023] Optionally, in step 3, when the CNN neural network model is trained, the parameters of the CNN neural network model are updated by using the energy equation and the DO radiation model equation of discrete coordinates, wherein the energy equation is:

[0024]

[0025] Where ρ is the density of the radiating material, is the Hamiltonian operator, E is the specific total energy, that is, the total energy per unit mass; t is time, U is velocity, and U = 0 in the solid domain; q is the heat flux, is the work done by viscous stress, p is the pressure, S e is the other lost heat, g is the gravitational acceleration;

[0026] The DO radiation model equation of discrete coordinates is:

[0027]

[0028] where σ is the Stefan-Boltzman constant; s is the scattering coefficient; a is the absorption coefficient; n is the refractive index; r is the Cartesian coordinate of the radiation source in space (x, y, z); s is the unit vector of the radiation direction of the radiation source (n x 、n y 、n z ), I is the radiation intensity, dΩ′ is the spherical element, s' is the unit vector in the other radiation direction, is the incident radiation intensity and T is the temperature.

[0029] Optionally, in step 5, based on the performance parameter optimization model, one or more target parameters are determined in the target population, including:

[0030] For each layout parameter in the target population, the layout parameter is input into the performance parameter optimization model to obtain the corresponding temperature parameter, which includes the temperature uniformity σ in the furnace, the temperature variability ε of the sintered workpiece, the maximum energy efficiency ratio η in the furnace, and the heat flux density Q / A on the surface of the workpiece, so as to obtain the target parameters corresponding to all the layout parameters; one or more target parameters are selected from all the temperature parameters, the temperature uniformity σ in the target parameter is the minimum value among all the temperature uniformities σ, the temperature variability ε of the sintered workpiece is the maximum value among all the temperature variabilities ε of the sintered workpiece, the maximum energy efficiency ratio η in the furnace is the maximum value among all the maximum energy efficiency ratios η in the furnace, and the heat flux density Q / A on the surface of the workpiece is the maximum value of all the heat flux densities Q / A on the surface of the workpiece.

[0031] Optionally, the layout-adjustable heating body group structure is composed of four heating body groups, each heating body group includes four sub-heating body groups, each sub-heating body group includes multiple adjustable conductive brackets and multiple adjustable heating bodies, one adjustable bracket is connected to the first end of the adjustable heating body, and another adjustable bracket is connected to the second end of the adjustable heating body, and the multiple adjustable heating bodies are parallel.

[0032] Optionally, the layout-adjustable heating body group structure is an adjustable parallel heating body group structure, which is composed of four heating body groups, each heating body group includes four sub-heating body groups, and each sub-heating body group includes two adjustable conductive bracket groups, multiple adjustable heating bodies, and multiple heating body conductive bracket fixing devices;

[0033] The adjustable conductive bracket group 1 includes two adjustable conductive brackets 1, two conductive bracket fixing devices, four conductive bracket fixing bolts, two conductive bracket fixing seats and four conductive bracket fixing rings; the two adjustable conductive brackets 1 are parallel, the two conductive bracket fixing devices are parallel, the two adjustable conductive brackets 1 are above the two conductive bracket fixing devices, and there is a gap between the two adjustable conductive brackets 1 and the two conductive bracket fixing devices;

[0034] The adjustable conductive support 1 includes an electrode connector and a conductive support 1 main body, the conductive support 1 main body is a long rectangular parallelepiped, and protruding plate-shaped rectangular parallelepipeds are designed at both ends of the adjustable conductive support 1, the plate-shaped rectangular parallelepiped is designed with a conductive support 1 threaded hole, and the conductive support 1 threaded hole is designed with an internal thread; a plane of the length and width of the conductive support 1 main body is serrated, and the length and height planes of the conductive support 1 main body are connected to the electrode connector; the electrode connector is a plate-shaped rectangular parallelepiped, and the electrode connector is designed with a hole that runs through the centers of two parallel length and width planes, and the length and height planes of the electrode connector are connected to the length and height planes of the conductive support 1 main body;

[0035] The conductive bracket fixing device is a long rectangular parallelepiped, and the two plane ends of the width and height of the conductive bracket fixing device are designed with protruding plate-shaped rectangular parallelepiped, and the plate-shaped rectangular parallelepiped is designed with a threaded hole of the conductive bracket fixing device, and the threaded hole of the conductive bracket fixing device is designed with an internal thread, and one plane of the length and width of the conductive bracket fixing device is serrated;

[0036] The conductive bracket fixing seat is a long rectangular parallelepiped, and the conductive bracket fixing seat is designed with a long hole running through two planes of length and width;

[0037] The conductive support fixing bolt is designed with an external thread, and the conductive support fixing ring is designed with an internal thread, and the external thread of the conductive support fixing bolt is meshed with the internal thread of the conductive support fixing ring;

[0038] The conductive bracket fixing bolt is meshed with the internal thread of a threaded hole of the conductive bracket, the conductive bracket fixing bolt is meshed with the hole of the conductive bracket fixing seat, and the conductive bracket fixing bolt is meshed with the internal thread of the threaded hole of the conductive bracket fixing device;

[0039] The adjustable heating body comprises an adjustable length heating body and a heating body fixing device, wherein the adjustable length heating body is a single rod of an adjustable length heating body, and both ends of the single rod of the adjustable length heating body are designed with external threads, the heating body fixing device is a circular cylinder, and both ends of the inner side of the heating body fixing device are designed with a heating body fixing thread 1 and a heating body fixing thread 2, the thread directions of the heating body fixing thread 1 and the heating body fixing thread 2 are different, and there is a gap between the heating body fixing thread 1 and the heating body fixing thread 2, the heating body fixing thread 1 is meshed with the external thread of one adjustable length heating body, and the heating body fixing thread 2 is meshed with the external thread of another adjustable length heating body, and the outer layer of the heating body fixing device is a heating body fixing sleeve shell;

[0040] The heating body conductive bracket fixing device is a rectangular parallelepiped as a whole, and is designed with a heating body conductive bracket fixing hole that runs through two parallel planes of length and width, and the inner side of the heating body conductive bracket fixing hole is designed with an internal thread, and a conductive bracket fixing shaft protrudes from two parallel planes of width and height;

[0041] The internal thread of the heating body conductive bracket fixing device 1 is meshed with the external thread of the adjustable heating body, and the two conductive bracket fixing shafts 1 of the heating body conductive bracket fixing device 1 are coupled with the gap between the adjustable conductive bracket 1 and the conductive bracket fixing device.

[0042] Optionally, the layout-adjustable heating body group structure is an adjustable triangle-connected heating body group structure, the adjustable triangle-connected heating body group structure is a rectangular parallelepiped, including a plurality of adjustable conductive bracket groups 1, a plurality of adjustable conductive bracket groups 2, a plurality of adjustable conductive bracket groups 3, a plurality of adjustable heating bodies, a plurality of heating body conductive bracket fixing devices 1, and a plurality of heating body conductive bracket fixing devices 2;

[0043] The adjustable conductive bracket group 2 includes two adjustable conductive brackets 2, two adjustable conductive brackets 3, four conductive bracket fixing bolts, two conductive bracket fixing seats and four conductive bracket fixing rings, the two adjustable conductive brackets 2 are parallel, the two adjustable conductive brackets 3 are parallel, the two adjustable conductive brackets 2 are above the two adjustable conductive brackets 3, and there is a gap between the two adjustable conductive brackets 2 and the two adjustable conductive brackets 3;

[0044] The adjustable conductive bracket 2 includes a conductive bracket 2 body and a conductive bracket 2 threaded hole. The adjustable conductive bracket 2 is a rectangular rectangular block with a right angle as a whole. A protruding plate-shaped rectangular block is designed at both ends of the right angle. The plate-shaped rectangular block is designed with a conductive bracket 2 threaded hole. The conductive bracket 2 threaded hole is designed with an internal thread. A plane of the length and width is tooth-shaped on the inner side of the right angle.

[0045] The adjustable conductive bracket 3 includes a conductive bracket 3 body and a conductive bracket 3 threaded hole. The conductive bracket 3 body is a rectangular rectangular block as a whole. A protruding plate-shaped rectangular block is designed at both ends of the right angle. The plate-shaped rectangular block is designed with a conductive bracket 3 threaded hole. The conductive bracket 3 threaded hole is designed with an internal thread. A plane of the length and width is tooth-shaped on the outside of the right angle.

[0046] The adjustable conductive bracket group three includes two adjustable conductive brackets four, two conductive bracket fixing devices, four conductive bracket fixing bolts, two conductive bracket fixing seats and four conductive bracket fixing rings; the two adjustable conductive brackets four are parallel, the two conductive bracket fixing devices are parallel, the two adjustable conductive brackets four are above the two conductive bracket fixing devices, and there is a gap between the two adjustable conductive brackets four and the two conductive bracket fixing devices;

[0047] The adjustable conductive bracket 4 is a long rectangular parallelepiped, and protruding plate-shaped rectangular parallelepipeds are designed at both ends of the adjustable conductive bracket 4, and the plate-shaped rectangular parallelepiped is designed with a threaded hole of the adjustable conductive bracket 4, and the threaded hole of the adjustable conductive bracket 4 is designed with an internal thread; a plane of the length and width of the adjustable conductive bracket 4 is serrated;

[0048] The second heater conductive bracket fixing device is a rectangular parallelepiped, and the second heater conductive bracket fixing device is designed with a second heater conductive bracket fixing hole that passes through two parallel planes of length and width, and an internal thread is designed on the inner side of the second heater conductive bracket fixing hole, and a second conductive bracket fixing shaft protrudes from two adjacent planes of width and height;

[0049] The internal thread of the heating body conductive bracket fixing device 2 is meshed with the external thread of the adjustable heating body, and the two conductive bracket fixing shafts 2 of the heating body conductive bracket fixing device 2 are coupled with the gap between the adjustable conductive bracket 2 and the adjustable conductive bracket 3;

[0050] Two conductive bracket fixing shafts 1 of the conductive bracket fixing device 1 of the heating body are coupled with the gap between the adjustable conductive bracket 4 and the conductive bracket fixing device;

[0051] The conductive bracket fixing bolt is meshed with the internal thread of the threaded hole of the adjustable conductive bracket 2, and the conductive bracket fixing bolt is meshed with the internal thread of the threaded hole of the conductive bracket 3.

[0052] The beneficial effects of adopting the above technical solution are:

[0053] The present invention provides a non-uniform layout optimization method for a heating body group structure with adjustable layout. The method uses a neural network to optimize the heating body layout parameters under specified objective functions, including but not limited to temperature uniformity in the furnace, temperature uniformity of workpieces, maximum energy efficiency ratio in the furnace, heat flux density on the surface of the workpiece, and other indicators. The method can be used to obtain the optimal heating body group layout parameters that meet the objective function and boundary conditions, including but not limited to optimizing the heating body layout parameters of the vacuum sintering furnace under the conditions of satisfying the physical boundary conditions of the vacuum furnace and satisfying the objective function.

[0054] The purpose of the present invention is to provide a heating body group structure with an adjustable layout. The use of the adjustable heating body group solves the problem that the positions of the heating bodies are mostly fixed at the factory and cannot be adjusted. After obtaining the optimal heating body layout parameters that meet the objective function and boundary conditions through the neural network-based heating body non-uniform layout parameter optimization method, the adjustable heating body group can realize dynamic adjustment of the heating body length, dynamic adjustment of the heating body spatial layout, and dynamic adjustment of the heating body group position; by adjusting the layout of the heating body group to the optimal heating body layout parameters, including but not limited to achieving optimization of the temperature uniformity in the furnace, the temperature uniformity of the workpiece, and the heat flux density on the workpiece surface and the maximum energy efficiency ratio in the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a flow chart of a method for optimizing a non-uniform layout of a heating body group structure with adjustable layout in an embodiment of the present invention;

[0056] Figure 2 It is a schematic diagram of optimizing the temperature uniformity in the furnace by comparing the non-uniform layout of the vacuum sintering furnace in the embodiment of the present invention with the original solution;

[0057] Figure 3 It is a schematic diagram of optimizing the workpiece temperature uniformity of the non-uniform layout of the vacuum sintering furnace in the embodiment of the present invention compared with the original solution;

[0058] Figure 4 Schematic diagram of the structure of the adjustable parallel heating body group of the vacuum sintering furnace in the embodiment of the present invention, wherein the adjustable conductive support group 101, the adjustable heating body 102, and the heating body conductive support fixing device 103;

[0059] Figure 5 1 is a schematic structural diagram of an adjustable conductive support set 101 in an embodiment of the present invention, wherein the adjustable conductive support set 1011, a conductive support fixing device 1012, a conductive support fixing bolt 1013, a conductive support fixing seat 1014, and a conductive support fixing ring 1015 are included;

[0060] Figure 61 is a schematic structural diagram of an adjustable conductive support 1011 in an embodiment of the present invention, wherein the adjustable conductive support 10111 includes an electrode connector 10111, a conductive support 1 body 10112, and a conductive support 1 threaded hole 10113;

[0061] Figure 7 Schematic diagram of the structure of the conductive support fixing seat 1014 in the embodiment of the present invention;

[0062] Figure 8 It is a partial enlarged view of the fixing of the conductive support of the adjustable heating body group of the vacuum sintering furnace in the embodiment of the present invention, wherein it includes a conductive support fixing bolt 1013, a conductive support fixing seat 1014, and a conductive support fixing ring 1015;

[0063] Fig. 9 1 is a schematic diagram of the structure of the adjustable heating body 102 in the embodiment of the present invention, wherein the adjustable length heating body 1021, the heating body fixing device 1022, and the heating body conductive bracket fixing device 103;

[0064] Fig.10 Schematic diagram of the structure of the adjustable length heating body 1021 in the embodiment of the present invention;

[0065] Fig.11 1 is a schematic diagram of the structure of the heating body fixing device 1022 in the embodiment of the present invention, wherein it includes a heating body fixing thread 1 10221, a heating body fixing thread 2 10222, and a heating body fixing sleeve shell 10223;

[0066] Fig.12 103 is a schematic structural diagram of a heating body conductive bracket fixing device 103 in an embodiment of the present invention, wherein the device comprises a heating body conductive bracket fixing hole 1031 and a conductive bracket fixing shaft 1032;

[0067] Fig.13 Schematic diagram of the structure of the adjustable triangle-connected heating body group in the embodiment of the present invention, which includes an adjustable conductive bracket group 1 101, an adjustable conductive bracket group 2 104, an adjustable conductive bracket group 3 105, an adjustable heating body 102, a heating body conductive bracket fixing device 1 103 and a heating body conductive bracket fixing device 2 106;

[0068] Fig.14 1 is a schematic diagram of the structure of the adjustable conductive bracket group 2 104 in an embodiment of the present invention, which includes an adjustable conductive bracket 2 1041, an adjustable conductive bracket 3 1042, a conductive bracket fixing bolt 1013, a conductive bracket fixing seat 1014 and a conductive bracket fixing ring 1015;

[0069] Fig.151041 is a schematic structural diagram of an adjustable conductive support 2 in an embodiment of the present invention, wherein the conductive support 2 includes a conductive support 2 body 10411 and a conductive support 2 threaded hole 10412;

[0070] Fig.16 1042 is a schematic structural diagram of an adjustable conductive bracket 3 1042 in an embodiment of the present invention, wherein the conductive bracket 3 body 10421 and the conductive bracket 3 threaded hole 10422 are included;

[0071] Fig.17 1 is a schematic structural diagram of a second heater conductive bracket fixing device 106 in an embodiment of the present invention, which includes a second heater conductive bracket fixing hole 1061 and a second conductive bracket fixing shaft 1062 . DETAILED DESCRIPTION

[0072] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0073] In view of the problems existing in the prior art, the present invention provides a non-uniform layout optimization method for a heating body group structure with adjustable layout, combining Figure 1 , which may include the following steps:

[0074] Step 1: Based on the four groups of heating body groups, the heating process of the workpiece in the vacuum sintering furnace is simulated to obtain temperature data, wherein the temperature data includes the average temperature in the vacuum furnace, the average temperature of multiple cross sections of the heating chamber in the vacuum furnace, the average temperature of the entire workpiece, the temperature of each temperature measurement point on the workpiece, and the initial temperature of the workpiece;

[0075] In the specific implementation process, Ansys can be used to perform Fluent simulation on the optimized non-uniform layout parameters.

[0076] Step 2: Calculate the temperature uniformity σ in the furnace, the temperature variability ε of the sintered workpiece, the maximum energy efficiency ratio η in the furnace, and the heat flux density Q / A on the workpiece surface based on the temperature data; take the temperature uniformity σ in the furnace, the temperature variability ε of the sintered workpiece, the maximum energy efficiency ratio η in the furnace, and the heat flux density Q / A on the workpiece surface as output samples, and take the layout parameters X={x1, x2, x3, x4} of the four groups of heating bodies as input samples, the output samples and the input samples constitute training samples, and multiple training samples constitute a training sample set;

[0077] Among them, the temperature uniformity σ in the furnace, the temperature variability ε of the sintered workpiece, the maximum energy efficiency ratio η in the furnace, and the heat flux density Q / A on the workpiece surface are calculated based on the temperature data and are calculated by the following formula:

[0078]

[0079] in, is the average temperature in the vacuum furnace, T i is the average temperature of the i-th section of the heating chamber in the vacuum furnace, n is the number of sections;

[0080]

[0081] in, represents the average temperature of the entire workpiece, N represents the number of temperature measurement points taken on the workpiece, T j Represents the temperature of the jth temperature measurement point of the workpiece;

[0082]

[0083] Among them, c g represents the specific heat capacity of the workpiece, represents the average temperature of the entire workpiece, T0 represents the initial temperature of the workpiece, ρ g Indicates the density of the workpiece, V g represents the volume of the workpiece, P represents the furnace heating power, t s Indicates the heating time;

[0084] Q / A=P1 / A;

[0085] Among them, P1 is the heat power absorbed or emitted by the workpiece, and A is the surface area of ​​the workpiece.

[0086] Step 3: Train the CNN neural network model based on the training sample set to obtain a performance parameter optimization model;

[0087] Among them, the CNN neural network includes an input layer, a hidden layer, and an output layer. The hidden layer is mainly a number of sub-hidden layers with different numbers of neurons connected in sequence. The input function uses the relu function as the activation function, and the remaining layers use the swish function or other commonly used nonlinear functions σ as the activation function.

[0088] Among them, the performance parameter optimization model can accurately express the temperature uniformity σ in all furnaces within the parameter range, the temperature variability ε of the sintered workpiece, the maximum energy efficiency ratio η in the furnace, and the heat flux density Q / A on the workpiece surface.

[0089] When the CNN neural network model is trained, the parameters of the CNN neural network model are updated through the energy equation and the DO radiation model equation of discrete coordinates, wherein the energy equation is:

[0090]

[0091] Where ρ is the density of the radiating material, is the Hamiltonian operator, E is the specific total energy, that is, the total energy per unit mass; t is time, U is velocity, and U = 0 in the solid domain; q is the heat flux, is the work done by viscous stress, p is the pressure, S e is the other lost heat, g is the gravitational acceleration;

[0092] The DO radiation model equation of discrete coordinates is:

[0093]

[0094] where σ is the Stefan-Boltzman constant; s is the scattering coefficient; a is the absorption coefficient; n is the refractive index; r is the Cartesian coordinate of the radiation source in space (x, y, z); s is the unit vector of the radiation direction of the radiation source (n x 、n y 、n z ), I is the radiation intensity, dΩ′ is the spherical element, s' is the unit vector in the other radiation direction, is the incident radiation intensity and T is the temperature.

[0095] Step 4: According to the preset value ranges of the layout parameters of the four groups of heating bodies, real number coding is used to randomly generate an initial population containing 10,000 layout parameters, and a chaotic genetic algorithm is used to add a chaotic factor, set the chaotic immigration ratio, and the number of iterations, and screen the initial population to obtain the target population;

[0096] Step 5: Based on the performance parameter optimization model, one or more target parameters are determined in the target population, and layout parameters corresponding to the target parameters are obtained. Based on the layout parameters of the four groups of heaters, the layout of the four groups of heaters in the heater group structure with adjustable layout is adjusted.

[0097] Wherein, based on the performance parameter optimization model, one or more target parameters are determined in the target population, including:

[0098] For each layout parameter in the target population, the layout parameter is input into the performance parameter optimization model to obtain the corresponding temperature parameter, which includes the temperature uniformity σ in the furnace, the temperature variability ε of the sintered workpiece, the maximum energy efficiency ratio η in the furnace, and the heat flux density Q / A on the surface of the workpiece, so as to obtain the target parameters corresponding to all the layout parameters; one or more target parameters are selected from all the temperature parameters, the temperature uniformity σ in the target parameter is the minimum value among all the temperature uniformities σ, the temperature variability ε of the sintered workpiece is the maximum value among all the temperature variabilities ε of the sintered workpiece, the maximum energy efficiency ratio η in the furnace is the maximum value among all the maximum energy efficiency ratios η in the furnace, and the heat flux density Q / A on the surface of the workpiece is the maximum value of all the heat flux densities Q / A on the surface of the workpiece.

[0099] Based on the target parameters, the furnace temperature uniformity σ, the sintering workpiece temperature variability ε, the maximum energy efficiency ratio η in the furnace, the workpiece surface heat flux density Q / A, and Figure 2 and Figure 3 , a non-uniform layout scheme, i.e., the scheme of the present invention, can be obtained. Compared with the original layout scheme, the temperature uniformity σ in the furnace is improved by 16%, and the coefficient of temperature variability ε of the workpiece is reduced by 45.12%.

[0100] The layout-adjustable heating body group structure is composed of four heating body groups, each heating body group includes four sub-heating body groups, each sub-heating body group includes multiple adjustable conductive brackets and multiple adjustable heating bodies, one adjustable bracket is connected to the first end of the adjustable heating body, and another adjustable bracket is connected to the second end of the adjustable heating body, and the multiple adjustable heating bodies are parallel.

[0101] Combination Figure 4 The layout-adjustable heating body group structure is an adjustable parallel heating body group structure, which is composed of four heating body groups, each heating body group includes four sub-heating body groups, and each sub-heating body group includes two adjustable conductive bracket groups 101, multiple adjustable heating bodies 102 and multiple heating body conductive bracket fixing devices 103;

[0102] Combination Figure 5 The adjustable conductive bracket group 101 includes two adjustable conductive brackets 1011, two conductive bracket fixing devices 1012, four conductive bracket fixing bolts 1013, two conductive bracket fixing seats 1014 and four conductive bracket fixing rings 1015; the two adjustable conductive brackets 1011 are parallel, the two conductive bracket fixing devices 1012 are parallel, the two adjustable conductive brackets 1011 are above the two conductive bracket fixing devices 1012, and there is a gap between the two adjustable conductive brackets 1011 and the two conductive bracket fixing devices 1012;

[0103] Combination Figure 6The adjustable conductive bracket 1011 includes an electrode connector 10111 and a conductive bracket main body 10112, wherein the conductive bracket main body 10112 is a long rectangular parallelepiped, and protruding plate-shaped rectangular parallelepipeds are designed at both ends of the adjustable conductive bracket 1011, and the plate-shaped rectangular parallelepiped is designed with a conductive bracket threaded hole 10113, and the conductive bracket threaded hole 10113 is designed with an internal thread; a plane of the length and width of the conductive bracket main body 10112 is serrated, and the length and height planes of the conductive bracket main body 10112 are connected to the electrode connector 10111; the electrode connector 10111 is a plate-shaped rectangular parallelepiped, and the electrode connector 10111 is designed with a hole that runs through the centers of two parallel length and width planes, and the length and height planes of the electrode connector 10111 are connected to the length and height planes of the conductive bracket main body 10112;

[0104] Among them, the electrode connector 10111 and the vacuum furnace electrode lead are connected by a soft connection to achieve circuit flow.

[0105] The conductive bracket fixing device 1012 is a long rectangular parallelepiped, and the two plane ends of the width and height of the conductive bracket fixing device 1012 are designed with protruding plate-shaped rectangular parallelepiped, and the plate-shaped rectangular parallelepiped is designed with a conductive bracket fixing device threaded hole 10121, and the conductive bracket fixing device threaded hole 10121 is designed with an internal thread, and a plane of the length and width of the conductive bracket fixing device 1012 is serrated;

[0106] Combination Figure 7 The conductive bracket fixing seat 1014 is a long rectangular parallelepiped, and the conductive bracket fixing seat is designed with a long hole running through two planes of length and width;

[0107] Combination Figure 8 The conductive support fixing bolt 1013 is designed with an external thread, and the conductive support fixing ring 1015 is designed with an internal thread, and the external thread of the conductive support fixing bolt 1013 and the internal thread of the conductive support fixing ring 1015 are meshed;

[0108] The conductive bracket fixing bolt 1013 is meshed with the internal thread of the conductive bracket first threaded hole 10113, the conductive bracket fixing bolt 1013 is meshed with the hole of the conductive bracket fixing seat 1014, and the conductive bracket fixing bolt 1013 is meshed with the internal thread of the conductive bracket fixing device threaded hole 10121;

[0109] Combination Fig. 9 The adjustable heating body 102 includes an adjustable length heating body 1021 and a heating body fixing device 1022. The adjustable length heating body 1021 is a single rod of an adjustable length heating body. Fig.10 The adjustable length heating body single rod is designed with external threads at both ends, and the heating body fixing device 1022 is a circular cylinder. Fig.11 , a heating body fixing thread 10221 and a heating body fixing thread 2 10222 are designed at both ends of the inner side of the heating body fixing device 1022, the thread directions of the heating body fixing thread 10221 and the heating body fixing thread 2 10222 are different, and there is a gap between the heating body fixing thread 10221 and the heating body fixing thread 2 10222, the heating body fixing thread 10221 is engaged with the external thread of one adjustable length heating body, and the heating body fixing thread 2 10222 is engaged with the external thread of another adjustable length heating body, and the outer layer of the heating body fixing device 1022 is a heating body fixing sleeve shell 10223;

[0110] The adjustable heating body 102 should reserve a portion of expansion space to prevent the material from expanding at high temperature. The adjustable heating body is made of graphite with threads at both ends. The length of the heating body is 20 cm.

[0111] Combination Fig.12 The heating body conductive bracket fixing device 103 is a rectangular parallelepiped as a whole, and the heating body conductive bracket fixing device is designed with a heating body conductive bracket fixing hole 1031 that runs through two parallel planes of length and width, and the inner side of the heating body conductive bracket fixing hole 1031 is designed with an internal thread, and a conductive bracket fixing shaft 1032 protrudes from two parallel planes of width and height;

[0112] Among them, the material of the heating body conductive bracket fixing device 103 is graphite, its outer surface is wrapped with a 0.5mm tantalum carbide coating to increase stability, and its inner surface is threaded.

[0113] The internal thread of the heating body conductive bracket fixing device 103 is engaged with the external thread of the adjustable heating body 102, and the two conductive bracket fixing shafts 1032 of the heating body conductive bracket fixing device 103 are coupled with the gap between the adjustable conductive bracket 1011 and the conductive bracket fixing device 1012.

[0114] Combination Fig.13 The heating body group structure with adjustable layout is an adjustable triangle-connected heating body group structure, which is a rectangular parallelepiped, including a plurality of adjustable conductive bracket groups 101, a plurality of adjustable conductive bracket groups 2 104, a plurality of adjustable conductive bracket groups 3 105, a plurality of adjustable heating bodies 102, a plurality of heating body conductive bracket fixing devices 103 and a plurality of heating body conductive bracket fixing devices 2 106;

[0115] Combination Fig.14The adjustable conductive bracket group 2 104 includes two adjustable conductive brackets 2 1041, two adjustable conductive brackets 3 1042, four conductive bracket fixing bolts 1013, two conductive bracket fixing seats 1014 and four conductive bracket fixing rings 1015. The two adjustable conductive brackets 2 1041 are parallel, the two adjustable conductive brackets 3 1042 are parallel, the two adjustable conductive brackets 2 1041 are above the two adjustable conductive brackets 3 1042, and there is a gap between the two adjustable conductive brackets 2 1041 and the two adjustable conductive brackets 3 1042;

[0116] Combination Fig.15 The adjustable conductive bracket 1041 includes a conductive bracket body 10411 and a conductive bracket threaded hole 10412. The conductive bracket body 10411 is a rectangular long rectangular parallelepiped as a whole. Protruding plate-like rectangular parallelepipeds are designed at both ends of the right angles. The plate-like rectangular parallelepiped is designed with a conductive bracket threaded hole 10412. The conductive bracket threaded hole 10412 is designed with an internal thread, and a plane of length and width is tooth-shaped on the inner side of the right angle;

[0117] Combination Fig.16 The adjustable conductive bracket 3 1042 includes a conductive bracket 3 body 10421 and a conductive bracket 3 threaded hole 10422. The conductive bracket 3 body 10421 is a rectangular rectangular block as a whole. Protruding plate-like rectangular blocks are designed at both ends of the right angle. The plate-like rectangular block is designed with a conductive bracket 3 threaded hole 10422. The conductive bracket 3 threaded hole 10422 is designed with an internal thread, and a plane of length and width is tooth-shaped on the outside of the right angle.

[0118] The adjustable conductive bracket group three 105 includes two adjustable conductive brackets four 1051, two conductive bracket fixing devices 1012, four conductive bracket fixing bolts 1013, two conductive bracket fixing seats 1014 and four conductive bracket fixing rings 1015; the two adjustable conductive brackets four 1051 are parallel, the two conductive bracket fixing devices 1012 are parallel, the two adjustable conductive brackets four 1051 are above the two conductive bracket fixing devices 1012, and there is a gap between the two adjustable conductive brackets four 1051 and the two conductive bracket fixing devices 1012;

[0119] The adjustable conductive bracket 4 1051 is a long rectangular parallelepiped, and a protruding plate-shaped rectangular parallelepiped is designed at both ends of the adjustable conductive bracket 4, and the plate-shaped rectangular parallelepiped is designed with a conductive bracket 4 threaded hole 10511, and the conductive bracket 4 threaded hole 10511 is designed with an internal thread; a plane of the length and width of the adjustable conductive bracket 4 is serrated;

[0120] Combination Fig.17The second heating body conductive bracket fixing device 106 is a rectangular parallelepiped, and the second heating body conductive bracket fixing device is designed with a second heating body conductive bracket fixing hole 1061 that passes through two parallel planes of length and width. The inner side of the second heating body conductive bracket fixing hole 1061 is designed with an internal thread, and a second conductive bracket fixing shaft 1062 protrudes from two adjacent planes of width and height;

[0121] The internal thread of the second heating body conductive bracket fixing device 106 is meshed with the external thread of the adjustable heating body 102, and the two conductive bracket fixing shafts 1062 of the second heating body conductive bracket fixing device 106 are coupled with the gap between the second adjustable conductive bracket 1041 and the third adjustable conductive bracket 1042;

[0122] Two conductive support fixing shafts 1032 of the conductive support fixing device 103 of the heating body are coupled with the gap between the adjustable conductive support 1051 and the conductive support fixing device 1012;

[0123] The conductive bracket fixing bolt 1013 is meshed with the internal thread of the threaded hole of the adjustable conductive bracket 2 1041 , and the conductive bracket fixing bolt 1013 is meshed with the internal thread of the threaded hole 10422 of the conductive bracket 3 .

[0124] The adjustable heating body group solves the problem that the current heating body group is fixed and cannot be adjusted, and the position and layout of the heating body group cannot be adjusted according to actual conditions, and at the same time solves the problem that the heating body is difficult to disassemble and replace.

[0125] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) to form a technical solution.

Claims

1. A method for optimizing the non-uniform layout of a heating element group structure with adjustable layout, characterized in that: include: Step 1: Based on the four groups of heating body groups, the heating process of the workpiece in the vacuum sintering furnace is simulated to obtain temperature data, wherein the temperature data includes the average temperature in the vacuum furnace, the average temperature of multiple cross sections of the heating chamber in the vacuum furnace, the average temperature of the entire workpiece, the temperature of each temperature measurement point on the workpiece, and the initial temperature of the workpiece; Step 2: Calculate the temperature uniformity σ in the furnace, the temperature variability ε of the sintered workpiece, the maximum energy efficiency ratio η in the furnace, and the heat flux density Q / A on the surface of the workpiece based on the temperature data; take the temperature uniformity σ in the furnace, the temperature variability ε of the sintered workpiece, the maximum energy efficiency ratio η in the furnace, and the heat flux density Q / A on the surface of the workpiece as output samples, and take the layout parameters of the four groups of heating bodies as input samples, the output samples and the input samples constitute training samples, and multiple training samples constitute a training sample set; Step 3: Train the CNN neural network model based on the training sample set to obtain a performance parameter optimization model; Step 4: According to the preset value ranges of the layout parameters of the four groups of heating bodies, real number coding is used to randomly generate an initial population containing 10,000 layout parameters, and a chaotic genetic algorithm is used to add a chaotic factor, set the chaotic immigration ratio, and the number of iterations, and screen the initial population to obtain the target population; Step 5: Based on the performance parameter optimization model, one or more target parameters are determined in the target population, and layout parameters corresponding to the target parameters are obtained. Based on the layout parameters of the four groups of heaters, the layout of the four groups of heaters in the heater group structure with adjustable layout is adjusted.

2. The non-uniform layout optimization method for a layout-adjustable heating body group structure according to claim 1, characterized in that: In step 2, the temperature uniformity σ in the furnace, the temperature variability ε of the sintered workpiece, the maximum energy efficiency ratio η in the furnace, and the heat flux density Q / A on the workpiece surface are calculated based on the temperature data using the following formula: in, is the average temperature in the vacuum furnace, T i is the average temperature of the i-th section of the heating chamber in the vacuum furnace, n is the number of sections; in, represents the average temperature of the entire workpiece, N represents the number of temperature measurement points taken on the workpiece, T j Represents the temperature of the jth temperature measurement point of the workpiece; Among them, c g represents the specific heat capacity of the workpiece, represents the average temperature of the entire workpiece, T0 represents the initial temperature of the workpiece, ρ g Indicates the density of the workpiece, V g represents the volume of the workpiece, P represents the furnace heating power, t s Indicates the heating time; Q / A=P1 / A; Among them, P1 is the heat power absorbed or emitted by the workpiece, and A is the surface area of ​​the workpiece.

3. The non-uniform layout optimization method for a layout-adjustable heating body group structure according to claim 1, characterized in that: In step 3, when the CNN neural network model is trained, the parameters of the CNN neural network model are updated through the energy equation and the DO radiation model equation of discrete coordinates, where the energy equation is: Where ρ is the density of the radiating material, is the Hamiltonian operator, E is the specific total energy, that is, the total energy per unit mass; t is time, U is velocity, and U = 0 in the solid domain; q is the heat flux, is the work done by viscous stress, p is the pressure, S e is the other lost heat, g is the gravitational acceleration; The DO radiation model equation of discrete coordinates is: where σ is the Stefan-Boltzman constant; s is the scattering coefficient; a is the absorption coefficient; n is the refractive index; r is the Cartesian coordinate of the radiation source in space (x, y, z); s is the unit vector of the radiation direction of the radiation source (n x 、n y 、n z ), I is the radiation intensity, dΩ′ is the spherical element, s' is the unit vector in the other radiation direction, is the incident radiation intensity and T is the temperature.

4. The non-uniform layout optimization method for a layout-adjustable heating body group structure according to claim 1, characterized in that: In step 5, based on the performance parameter optimization model, one or more target parameters are determined in the target population, including: For each layout parameter in the target population, the layout parameter is input into the performance parameter optimization model to obtain the corresponding temperature parameter, which includes the temperature uniformity σ in the furnace, the temperature variability ε of the sintered workpiece, the maximum energy efficiency ratio η in the furnace, and the heat flux density Q / A on the surface of the workpiece, so as to obtain the target parameters corresponding to all the layout parameters; one or more target parameters are selected from all the temperature parameters, the temperature uniformity σ in the target parameter is the minimum value among all the temperature uniformities σ, the temperature variability ε of the sintered workpiece is the maximum value among all the temperature variabilities ε of the sintered workpiece, the maximum energy efficiency ratio η in the furnace is the maximum value among all the maximum energy efficiency ratios η in the furnace, and the heat flux density Q / A on the surface of the workpiece is the maximum value of all the heat flux densities Q / A on the surface of the workpiece.

5. The non-uniform layout optimization method for a layout-adjustable heating body group structure according to claim 1, characterized in that: The layout-adjustable heating body group structure is composed of four heating body groups, each heating body group includes four sub-heating body groups, each sub-heating body group includes multiple adjustable conductive brackets and multiple adjustable heating bodies, one adjustable bracket is connected to the first end of the adjustable heating body, and another adjustable bracket is connected to the second end of the adjustable heating body, and the multiple adjustable heating bodies are parallel.

6. The non-uniform layout optimization method for a layout-adjustable heating body group structure according to claim 5, characterized in that: The layout-adjustable heating body group structure is an adjustable parallel heating body group structure, which is composed of four heating body groups, each heating body group includes four sub-heating body groups, and each sub-heating body group includes two adjustable conductive bracket groups, multiple adjustable heating bodies, and multiple heating body conductive bracket fixing devices; The adjustable conductive bracket group 1 includes two adjustable conductive brackets 1, two conductive bracket fixing devices, four conductive bracket fixing bolts, two conductive bracket fixing seats and four conductive bracket fixing rings; the two adjustable conductive brackets 1 are parallel, the two conductive bracket fixing devices are parallel, the two adjustable conductive brackets 1 are above the two conductive bracket fixing devices, and there is a gap between the two adjustable conductive brackets 1 and the two conductive bracket fixing devices; The adjustable conductive support 1 includes an electrode connector and a conductive support 1 main body, the conductive support 1 main body is a long rectangular parallelepiped, and protruding plate-shaped rectangular parallelepipeds are designed at both ends of the adjustable conductive support 1, the plate-shaped rectangular parallelepiped is designed with a conductive support 1 threaded hole, and the conductive support 1 threaded hole is designed with an internal thread; a plane of the length and width of the conductive support 1 main body is serrated, and the length and height planes of the conductive support 1 main body are connected to the electrode connector; the electrode connector is a plate-shaped rectangular parallelepiped, and the electrode connector is designed with a hole that runs through the centers of two parallel length and width planes, and the length and height planes of the electrode connector are connected to the length and height planes of the conductive support 1 main body; The conductive bracket fixing device is a long rectangular parallelepiped, and the two plane ends of the width and height of the conductive bracket fixing device are designed with protruding plate-shaped rectangular parallelepiped, and the plate-shaped rectangular parallelepiped is designed with a threaded hole of the conductive bracket fixing device, and the threaded hole of the conductive bracket fixing device is designed with an internal thread, and one plane of the length and width of the conductive bracket fixing device is serrated; The conductive bracket fixing seat is a long rectangular parallelepiped, and the conductive bracket fixing seat is designed with a long hole running through two planes of length and width; The conductive support fixing bolt is designed with an external thread, and the conductive support fixing ring is designed with an internal thread, and the external thread of the conductive support fixing bolt is meshed with the internal thread of the conductive support fixing ring; The conductive bracket fixing bolt is meshed with the internal thread of a threaded hole of the conductive bracket, the conductive bracket fixing bolt is meshed with the hole of the conductive bracket fixing seat, and the conductive bracket fixing bolt is meshed with the internal thread of the threaded hole of the conductive bracket fixing device; The adjustable heating body comprises an adjustable length heating body and a heating body fixing device, wherein the adjustable length heating body is a single rod of an adjustable length heating body, and both ends of the single rod of the adjustable length heating body are designed with external threads, the heating body fixing device is a circular cylinder, and both ends of the inner side of the heating body fixing device are designed with a heating body fixing thread 1 and a heating body fixing thread 2, the thread directions of the heating body fixing thread 1 and the heating body fixing thread 2 are different, and there is a gap between the heating body fixing thread 1 and the heating body fixing thread 2, the heating body fixing thread 1 is meshed with the external thread of one adjustable length heating body, and the heating body fixing thread 2 is meshed with the external thread of another adjustable length heating body, and the outer layer of the heating body fixing device is a heating body fixing sleeve shell; The heating body conductive bracket fixing device 1 is a rectangular parallelepiped as a whole, and is designed with a heating body conductive bracket fixing hole 1 that runs through two parallel planes of length and width, and an internal thread is designed on the inner side of the heating body conductive bracket fixing hole 1, and a conductive bracket fixing shaft 1 protrudes from two parallel planes of width and height; The internal thread of the heating body conductive bracket fixing device 1 is meshed with the external thread of the adjustable heating body, and the two conductive bracket fixing shafts 1 of the heating body conductive bracket fixing device 1 are coupled with the gap between the adjustable conductive bracket 1 and the conductive bracket fixing device.

7. The non-uniform layout optimization method for a layout-adjustable heating body group structure according to claim 6, characterized in that: The layout-adjustable heating body group structure is an adjustable triangle-connected heating body group structure, which is a rectangular parallelepiped, including a plurality of adjustable conductive bracket groups 1, a plurality of adjustable conductive bracket groups 2, a plurality of adjustable conductive bracket groups 3, a plurality of adjustable heating bodies, a plurality of heating body conductive bracket fixing devices 1, and a plurality of heating body conductive bracket fixing devices 2; The adjustable conductive bracket group 2 includes two adjustable conductive brackets 2, two adjustable conductive brackets 3, four conductive bracket fixing bolts, two conductive bracket fixing seats and four conductive bracket fixing rings, the two adjustable conductive brackets 2 are parallel, the two adjustable conductive brackets 3 are parallel, the two adjustable conductive brackets 2 are above the two adjustable conductive brackets 3, and there is a gap between the two adjustable conductive brackets 2 and the two adjustable conductive brackets 3; The adjustable conductive bracket 2 includes a conductive bracket 2 body and a conductive bracket 2 threaded hole. The adjustable conductive bracket 2 is a rectangular rectangular block with a right angle as a whole. A protruding plate-shaped rectangular block is designed at both ends of the right angle. The plate-shaped rectangular block is designed with a conductive bracket 2 threaded hole. The conductive bracket 2 threaded hole is designed with an internal thread. A plane of the length and width is tooth-shaped on the inner side of the right angle. The adjustable conductive bracket 3 includes a conductive bracket 3 body and a conductive bracket 3 threaded hole. The conductive bracket 3 body is a rectangular rectangular block as a whole. A protruding plate-like rectangular block is designed at both ends of the right angle. The plate-like rectangular block is designed with a conductive bracket 3 threaded hole. The conductive bracket 3 threaded hole is designed with an internal thread. A plane of the length and width is tooth-shaped on the outside of the right angle. The adjustable conductive bracket group three includes two adjustable conductive brackets four, two conductive bracket fixing devices, four conductive bracket fixing bolts, two conductive bracket fixing seats and four conductive bracket fixing rings; the two adjustable conductive brackets four are parallel, the two conductive bracket fixing devices are parallel, the two adjustable conductive brackets four are above the two conductive bracket fixing devices, and there is a gap between the two adjustable conductive brackets four and the two conductive bracket fixing devices; The adjustable conductive bracket 4 is a long rectangular parallelepiped, and protruding plate-shaped rectangular parallelepipeds are designed at both ends of the adjustable conductive bracket 4, and the plate-shaped rectangular parallelepiped is designed with a threaded hole of the adjustable conductive bracket 4, and the threaded hole of the adjustable conductive bracket 4 is designed with an internal thread; a plane of the length and width of the adjustable conductive bracket 4 is serrated; The second heater conductive bracket fixing device is a rectangular parallelepiped, and the second heater conductive bracket fixing device is designed with a second heater conductive bracket fixing hole that passes through two parallel planes of length and width, and an internal thread is designed on the inner side of the second heater conductive bracket fixing hole, and a second conductive bracket fixing shaft protrudes from two adjacent planes of width and height; The internal thread of the heating body conductive bracket fixing device 2 is meshed with the external thread of the adjustable heating body, and the two conductive bracket fixing shafts 2 of the heating body conductive bracket fixing device 2 are coupled with the gap between the adjustable conductive bracket 2 and the adjustable conductive bracket 3; Two conductive bracket fixing shafts 1 of the conductive bracket fixing device 1 of the heating body are coupled with the gap between the adjustable conductive bracket 4 and the conductive bracket fixing device; The conductive bracket fixing bolt is meshed with the internal thread of the threaded hole of the adjustable conductive bracket 2, and the conductive bracket fixing bolt is meshed with the internal thread of the threaded hole of the conductive bracket 3.

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