Temperature control system of muffle-free well type heat treatment furnace

Abstract

The present application provides a kind of muffleless well type heat treatment furnace temperature control system, including furnace shell, heating unit for adjusting temperature parameter in furnace shell is arranged in furnace shell, and variable position unit is movably arranged in furnace shell and connected with heating unit, and variable position unit is used to carry heating unit and move in furnace shell, change the shape of heat exchange pipe in furnace shell, the quantity of heating unit and the arrangement state of heating unit;The present application obtains the simulation data of temperature parameter change in heat treatment process in furnace shell by parameterized modeling, to finally determine the optimal structural parameter of heating unit, cooperate with the heat conducting medium that carries out convection in furnace shell is respectively through first pipe fitting and second pipe fitting and forms convection in furnace shell, obtains the temperature field state in furnace shell, realizes the real-time control to heat treatment workpiece temperature, to improve the control precision of furnace temperature, solve the problem of insufficient temperature control effect in heat treatment process.

Description

Technical Field

[0001] This invention relates to the field of heat treatment furnace technology, and in particular to a temperature control system for a muffle-free heat treatment furnace. Background Technology

[0002] To ensure that metal workpieces have good mechanical, physical, and chemical properties, approximately 80% of the parts require heat treatment. The traditional control method for heat treatment furnaces is to automatically adjust the temperature using actuators based on an economical furnace temperature setting. However, most heat treatment processes suffer from drawbacks such as high energy consumption, long processing time, and low thermal efficiency.

[0003] To ensure the heat treatment effect of parts, heating in a specific atmosphere is required, which is generally achieved by sealing the furnace chamber (commonly known as a muffle furnace). However, muffle furnaces operate in a harsh environment, exceeding 930℃ for extended periods during the carburizing process. Heat-resistant steel exposed to such temperatures and carbonaceous atmospheres is prone to deformation and carbon corrosion, resulting in a short service life. For example, a muffle furnace made of 8mm thick Cr25Ni20 heat-resistant steel typically deforms after about 10 months of use, and the deformation increases with use, requiring replacement after about 2 years. This situation makes the muffle furnace a consumable part; each repair and replacement not only results in the loss of a large amount of heat-resistant steel but also wastes significant production time, severely impacting the efficiency of heat treatment production. Furthermore, the presence of the muffle furnace increases the furnace's thermal inertia, making it difficult to quickly reach the preset temperature, leading to excessively high energy consumption in the heat treatment furnace.

[0004] Chinese patent application CN201710411781.7 discloses a tube furnace temperature control system and a tube furnace. The tube furnace temperature control system in this solution places the heating element inside the quartz tube of the tube furnace, and the heating element can be used to directly heat the sample. Compared with the previous external thermal radiation heating, it has the advantages of precise temperature control, fast heating and cooling speed, small heat loss, and greater energy saving and environmental protection.

[0005] However, in this technical solution, the heating element is placed inside the furnace body. During the heating process, the fixed heating element still needs a certain amount of time to heat the entire furnace body to the required temperature. The temperature changes in the areas near and far from the heating element inside the furnace body are different, which cannot be matched to different heating conditions and affects the timeliness of detecting the furnace body temperature value. Similarly, the heating element adopts a relatively simple thermal radiation method, which limits the optimization effect of furnace body temperature control performance. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a muffle-free heat treatment furnace temperature control system. This system obtains simulation data of temperature parameter changes during the heat treatment process within the furnace shell through parametric modeling, ultimately determining the optimal structural parameters of the heating unit. Combined with the detection of convection within the furnace shell via first and second pipe fittings, the system obtains the temperature field state within the furnace shell, enabling real-time control of the workpiece temperature. This improves the accuracy of furnace temperature control and solves the problem of insufficient temperature control during the heat treatment process.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A temperature control system for a muffle-free heat treatment furnace, comprising a furnace shell, and further comprising:

[0009] A heating unit, arranged inside the furnace shell, is used to regulate the temperature parameters inside the furnace shell; and

[0010] The displacement unit, which is connected to the heating unit, is movably located inside the furnace shell. The displacement unit is used to carry the heating unit to move within the furnace shell.

[0011] The heating unit includes a heat exchange tube movably mounted on the displacement unit, with the heat exchange tube located in the circumferential direction of the workpiece inside the furnace shell;

[0012] The heat exchange tube includes a first tube for heating the furnace shell and a second tube for cooling the furnace shell.

[0013] The workpiece is placed inside the furnace shell for heat treatment. The displacement unit pulls the heat exchange tubes in the heating unit to move, changing the shape of the heat exchange tubes, the number of heating units, and the arrangement of the heating units inside the furnace shell. This allows the heat of the heat transfer medium in the heat exchange tubes, which is higher or lower than the furnace shell temperature, to be conducted into the furnace shell along the first or second pipe fitting, thereby controlling the temperature parameters inside the furnace shell.

[0014] Furthermore, the heat exchange tube is made of a flexible material, and the heat exchange tube also includes a first tube section for bending deformation and a second tube section for expansion and contraction deformation;

[0015] The first pipe segment and the second pipe segment are alternately arranged, and the connection between the first pipe segment and the second pipe segment is movably connected to the displacement unit.

[0016] Furthermore, it also includes a heat exchange source for supplying heat exchange medium to the heat exchange tubes. The heat exchange source is arranged outside the furnace shell and forms a closed loop with the heat exchange tubes. The heat exchange source keeps the heat transfer medium in the heat exchange tubes in a flowing state.

[0017] As a preferred embodiment, it also includes a heating section for providing a heat source to the heat exchange tube. The heating section is movably disposed between the first tube section and the second tube section of the heat exchange tube. A heat source is fixed inside the heating section, and the outside of the heating section is movably connected to the displacement unit.

[0018] Furthermore, the displacement unit includes a traction assembly and a drive assembly respectively movably disposed on the inner and outer sides of the furnace shell, and the traction assembly and the drive assembly adopt magnetic transmission; multiple connection points are provided between the traction assembly and the heat exchange tube;

[0019] The movement of the drive component on the outside of the furnace shell causes the traction component to move synchronously on the inside of the furnace shell. The posture of the heat exchange tube is adjusted by the position change of the connection point between the traction component and the heat exchange tube.

[0020] Furthermore, the traction assembly is configured with a magnetic core encased in heat-resistant material, and the traction assembly includes:

[0021] A traction frame, which is circumferentially rotatable along the horizontal plane of the furnace shell;

[0022] The traction unit, movably mounted on the traction frame, moves vertically along the furnace shell; and

[0023] The traction component, which is movably mounted on the traction unit, moves radially along the horizontal plane of the furnace shell. The end of the traction component away from the inner wall of the furnace shell is movably connected to the heat exchange tube.

[0024] Specifically, the driving component includes:

[0025] A drive frame, the drive frame being arranged circumferentially on the outer side of the furnace shell;

[0026] The drive unit, movably mounted on the drive frame, is used for axial movement along the furnace shell; and

[0027] The driving component, which is fixed on the driving part, has a magnetic field generator fixed in it to drive the traction component to move.

[0028] As a preferred embodiment, the device also includes a magnetic field generator fixed in the drive assembly, wherein the magnetic field generator is positioned as follows:

[0029] The drive frame, wherein the magnetic field generator is arranged in the drive frame outside the furnace shell and is used to form a ring magnetic field in the circumferential direction of the furnace shell;

[0030] The drive unit, in which the magnetic field generator is fixedly mounted on the drive frame and used to form a linear magnetic field in the vertical direction of the furnace shell; and

[0031] The driving component, wherein the magnetic field generator is arranged within the driving component in the driving part and is used to form a linear magnetic field radially along the horizontal plane of the furnace shell, and the positions of the driving component and the traction component correspond to the inner and outer sides of the furnace shell.

[0032] As a preferred embodiment, the drive assembly further includes a number of magnetic field generators fixed on the furnace shell and arranged in groups. The drive assembly moves the traction component in the corresponding area inside the furnace shell by means of the magnetic field change between the several adjacent magnetic field generators.

[0033] The magnetic field direction of the magnetic field generator includes a ring magnetic field along the circumference of the furnace shell and a linear magnetic field along the axial direction of the furnace shell and the radial direction of the horizontal plane.

[0034] Furthermore, it also includes a shielding component for limiting the direction of the magnetic field of the magnetic field generator, and the shielding component is arranged in the following positions:

[0035] The drive frame, wherein the shielding component is arranged in a ring and fixed to the upper and lower end faces of the drive frame;

[0036] The drive unit, wherein the shielding member is arranged in an inverted shape and fixed in the vertical circumferential direction of the drive unit, with the opening of the inverted shielding member facing the furnace shell; and

[0037] The drive unit and the shielding component fixed on the drive unit are cylindrical in shape, and the axial direction of the cylindrical shielding component coincides with the radial direction of the horizontal plane of the furnace shell corresponding to the drive unit.

[0038] The beneficial effects of this invention are as follows:

[0039] (1) The present invention uses the shape of the heat exchange tube, the number of heating units and the arrangement of the heating units as design parameters, temperature uniformity as optimization target and the temperature change rate in the center of the furnace as constraint condition. Through parametric modeling, simulation data of temperature parameter changes in the heat treatment process inside the furnace shell are obtained, which is used to finally determine the optimal structural parameters of the heating unit, so as to realize that the heating unit inside the furnace shell is in an optimized structural state and improve the heat treatment effect.

[0040] (2) The present invention arranges sensors such as thermocouples at the ends of the heat exchange tubes to detect temperature parameters, so that the temperature changes of the heat-conducting medium such as gas that convects in the furnace shell are detected as it passes through the heat exchange tubes one after another, and convection is formed in the furnace shell through the first pipe and the second pipe respectively. This avoids heat loss caused by the convection of heat-conducting media with different heat values ​​in the same heat exchange tube, thereby enhancing the heat exchange efficiency, obtaining the temperature field state in the furnace shell, realizing real-time control of the temperature of the heat-treated workpiece, and thus improving the control effect of the furnace body temperature.

[0041] (3) The present invention utilizes the large space of the external heat exchanger to quickly adjust the temperature parameters corresponding to the heat in the heat transfer medium, and utilizes the rapid flow of the heat transfer medium in the closed loop formed between the heat exchanger and the heat exchange tube to further enhance the heat transfer performance of the heat exchange tube, thereby improving the temperature control effect inside the furnace shell.

[0042] (4) The present invention adopts a non-contact transmission magnetic drive method, and controls the pair of traction components in the traction assembly to make the heat exchange tubes construct various shapes, so that the heat exchange tubes change the distance between the heat exchange tubes and the workpieces inside the furnace shell, and uses the thermal inertia of heat conduction to make the final temperature meet the required temperature, and reduces the required temperature adjustment time, and is suitable for different workpieces and heating conditions.

[0043] (5) The present invention uses magnetic field generators arranged on the drive frame, drive part and drive component in the drive assembly to form a composite alternating magnetic field on the outside of the refractory insulation layer of the furnace shell to control the movement of the traction assembly inside the furnace shell. The magnetic field generator reduces the volume occupied by the drive assembly between the refractory insulation layer and the metal shell of the furnace shell.

[0044] (6) The present invention uses shielding components installed on each magnetic field generator in the drive assembly to limit the magnetic field generated by each magnetic field generator to act only on the traction part and traction component inside the furnace shell according to the direction of the magnetic field generated by each magnetic field generator, thereby avoiding interference between adjacent magnetic field generators, ensuring the driving effect of the drive assembly on the traction assembly, maintaining the attitude adjustment accuracy of the heat exchange tube, and thus improving the temperature control effect inside the furnace shell.

[0045] In summary, the present invention has advantages such as adjusting the heating performance of the heat treatment furnace and improving the temperature control effect of the heat treatment furnace. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0047] Figure 2 This is a schematic diagram of the overall internal structure of the present invention;

[0048] Figure 3 This is a schematic diagram of the overall structure of the heating unit and displacement unit of the present invention;

[0049] Figure 4 This is an exploded view of the overall structure of the heating unit and displacement unit of the present invention;

[0050] Figure 5 This is a partial structural diagram of the heating unit and displacement unit of the present invention in operation.

[0051] Figure 6 This is a partial structural diagram of the heating unit and displacement unit in Embodiment 4 of the present invention;

[0052] Figure 7 This is a schematic diagram of the internal overall structure in Embodiment 3 of the present invention;

[0053] Figure 8 for Figure 2 A magnified view of a portion of point A in the middle. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely one device embodiment of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0056] Example 1

[0057] like Figure 1-3 As shown, this embodiment provides a temperature control system for a muffle-free heat treatment furnace, including a furnace shell 1, and further comprising:

[0058] Heating unit 2, which is arranged inside the furnace shell 1, is used to adjust the temperature parameters inside the furnace shell 1; and

[0059] The displacement unit 3, which is connected to the heating unit 2, is movably disposed inside the furnace shell 1. The displacement unit 3 is used to carry the heating unit 2 to move inside the furnace shell 1.

[0060] The heating unit 2 includes a heat exchange tube 21 movably disposed on the displacement unit 3, and the heat exchange tube 21 is located in the circumferential direction of the workpiece inside the furnace shell 1.

[0061] The heat exchange tube 21 includes a first tube 211 for heating the furnace shell 1 and a second tube 212 for cooling the furnace shell 1.

[0062] The workpiece is placed in the furnace shell 1 for heat treatment. The displacement unit 3 pulls the heat exchange tube 21 in the heating unit 2 to move, changing the shape of the heat exchange tube 21, the number of heating units 2, and the arrangement of the heating units 2 in the furnace shell 1. This allows the heat of the heat-conducting medium in the heat exchange tube 21, which is higher or lower than the temperature of the furnace shell 1, to be conducted into the furnace shell 1 along the first pipe fitting 211 or the second pipe fitting 212, thereby controlling the temperature parameters inside the furnace shell 1.

[0063] First, a parametric model of the furnace shell 1 and its heating unit 2 is established using finite element software. Based on the state of the furnace shell 1 and the heat-treated workpiece, including parameters such as temperature, thermal inertia, shape dimensions, and convection velocity and direction of the heat transfer medium, and considering radiative heat transfer and internal heat conduction of the solid, the rated power is selected for heating. The load is simulated and calculated as the furnace heats up under different heat exchange tube 21 shapes, heating unit 2 numbers, and heating unit 2 arrangements. The single-factor comparison method is used to analyze the influence of changes in the structural parameters of the heating unit 2 on the heat flux density and temperature at the monitoring point.

[0064] After obtaining the basic data, the response surface methodology was used to establish functions of the shape of the heat exchange tube 21, the number of heating units 2, and the arrangement of the heating units 2 with respect to the temperature field uniformity. Using the shape of the heat exchange tube 21, the number of heating units 2, and the arrangement of the heating units 2 as design parameters, the temperature uniformity as the optimization objective, and the temperature change rate at the center of the furnace as the constraint, the interior point method in the MATLAB toolbox was used to optimize the structure of the heating system, and finally the optimal structural parameters of the heating unit 2 were determined.

[0065] In this embodiment, before the workpiece is placed in the furnace shell 1 for heat treatment, the state parameters of the workpiece are detected, including the position of the workpiece in the furnace shell 1, the size of the workpiece, the temperature, and the thermal inertia, and incorporated into the corresponding parameterized model. Then, the displacement unit 3 and the heating unit 2 are adjusted accordingly, so that the heat exchange tubes 21 in the furnace shell 1, such as electric heating tubes, are adjusted in arrangement under the drive of the traction component 313 of the displacement unit 3, matching the requirements of the workpiece structure in the parameterized model for the optimal shape of the heat exchange tubes 21, the number of heating units 2, and the arrangement of the heating units 2. Then, during the heat treatment process, the heat transfer medium, such as gas at different temperatures, flows through the heat exchange tubes 21 in the furnace shell 1, and the temperature inside the furnace shell 1 is regulated by the thermal radiation of the heat exchange tubes 21 themselves, thereby realizing that the heat treatment furnace is in an optimized structural state and improving the heat treatment effect.

[0066] For the heating or cooling process of the furnace shell 1, sensors such as thermocouples for detecting temperature parameters are arranged at the ends of the heat exchange tubes 21. The temperature changes of the heat-conducting medium such as gas that is convecting in the furnace shell 1 as it passes through the heat exchange tubes 21 are detected. Convection is formed in the furnace shell 1 through the first pipe fitting 211 and the second pipe fitting 212 respectively. This avoids heat loss caused by the convection of heat-conducting media with different heat values ​​in the same heat exchange tube 21, thereby enhancing the heat exchange efficiency. Furthermore, the temperature field state in the furnace shell 1 is obtained by using the simulation data of temperature parameter changes during the parametric modeling process, so as to realize the real-time control of the temperature of the heat-treated workpiece and thus improve the control effect of the furnace body temperature.

[0067] like Figure 4-5 As shown, the heat exchange tube 21 is made of flexible material, and the heat exchange tube 21 also includes a first tube section 213 for bending deformation and a second tube section 214 for expansion and contraction deformation;

[0068] The first pipe segment 213 and the second pipe segment 214 are alternately arranged, and the connection between the first pipe segment 213 and the second pipe segment 214 is movably connected to the displacement unit 3.

[0069] Before the workpiece is placed in the furnace shell 1 for heat treatment, according to the detected shape of the workpiece, the displacement unit 3 is driven by the traction component 313 in the displacement unit 3. The displacement unit 3, which is movably connected to the heat exchange tube 21, is connected by a universal joint between them. This causes the adjacent universal joints to move along the non-axial direction of the first tube section 213 and / or the axial direction of the second tube section 214. This causes the heat exchange tube 21 to change its shape under the bending deformation of the first tube section 213 and the expansion and contraction deformation of the second tube section 214. The heat exchange tube 21 is then distributed in a suitable position in the circumferential space of the workpiece, so that the workpiece surface and the heat exchange tube 21 in the furnace shell 1 maintain the same distance, thereby improving the uniformity of temperature change during the heat treatment of the workpiece.

[0070] like Figure 1-2 As shown, it also includes a heat exchange source 22 for supplying heat exchange medium to the heat exchange tube 21. The heat exchange source 22 is arranged outside the furnace shell 1 and forms a closed loop with the heat exchange tube 21. The heat exchange source 22 keeps the heat transfer medium in the heat exchange tube 21 in a flowing state.

[0071] In this embodiment, when adjusting the temperature inside the furnace shell 1, heat is conducted through the electric heating tube of the heat exchange tube 21, and the heat of the heat transfer medium is directly adjusted in the heat exchange source 22. By utilizing the large space of the external heat exchange source 22, the temperature parameters corresponding to the heat in the heat transfer medium are quickly adjusted. Furthermore, the rapid flow of the heat transfer medium in the closed loop formed between the heat exchange source 22 and the heat exchange tube 21 further enhances the heat transfer performance of the heat exchange tube 21, thereby improving the temperature control effect inside the furnace shell 1.

[0072] like Figure 5As shown, it also includes a heating part 210 for providing a heat source to the heat exchange tube 21. The heating part 210 is movably disposed between the first tube section 213 and the second tube section 214 of the heat exchange tube 21. A heat source is fixed inside the heating part 210, and the outer side of the heating part 210 is movably connected to the displacement unit 3.

[0073] The deformation of the heat exchange tube 21 under the action of the first tube section 213 and the second tube section 214 causes the electric heating element arranged therein to easily come into contact with the inner wall of the heat exchange tube 21, thus damaging the heat exchange performance. Through the heating part 210 arranged in the heat exchange tube 21, the outer side of the heating part 210 is movably connected to the traction member 313 of the displacement unit 3, keeping the electric heating element and the heating part 210 in a relatively static state during the shape change process of the heat exchange tube 21, maintaining the heating performance of the electric heating element of the heat source in the heating part 210, and cooperating with the loop formed between the heating part 210 and the heat exchange source 22, so that when the heat transfer medium flows through the heating part 210, the heating part 210 acts as a bend in the closed loop, and a secondary flow appears in the later section of the heat transfer medium flow, which strengthens the disturbance of the heat transfer medium, increases the flow velocity, and promotes the transfer of heat from the heating part 210 to the entire heat exchange tube 21, thereby improving the temperature control effect inside the furnace shell 1.

[0074] like Figure 2-5 As shown, the displacement unit 3 includes a traction component 31 and a drive component 32 that are movably disposed on the inner and outer sides of the furnace shell 1, respectively. The traction component 31 and the drive component 32 adopt magnetic transmission. Multiple connection points are provided between the traction component 31 and the heat exchange tube 21.

[0075] The movement of the drive assembly 32 on the outside of the furnace shell 1 causes the traction assembly 31 to move synchronously on the inside of the furnace shell 1. The posture of the heat exchange tube 21 is adjusted by the position change of the connection point between the traction assembly 31 and the heat exchange tube 21.

[0076] In this embodiment, the drive assembly 32 is arranged in the space between the outer side of the refractory insulation layer 10 of the furnace shell 1 and the inner side of the metal outer shell 11 of the furnace shell 1. By adopting a non-contact magnetic drive method, the movement of the heat exchange tube 21 is avoided from affecting the structural sealing of the furnace shell 1. At the same time, multiple connection points between the traction assembly 31 and the heat exchange tube 21 are arranged in pairs at the connection points of adjacent first tube segments 213 and second tube segments 214 in the heat exchange tube 21. By controlling the paired traction members 313 in the traction assembly 31, the heat exchange tube 21 is constructed into various shapes, so that the distance between the heat exchange tube 21 and the workpiece is changed inside the furnace shell 1. For example, in the later stage of the heating or cooling process, the heat exchange tube 21 is moved away from or closer to the workpiece. The thermal inertia of heat conduction is used to make the final temperature meet the required temperature and reduce the required temperature adjustment time, which is suitable for different workpieces and heating conditions.

[0077] like Figure 3-5As shown in Figure 8, the traction assembly 31 is a magnetic core material wrapped with heat-resistant material, and the traction assembly 31 includes:

[0078] The traction frame 311 is circumferentially rotatable along the horizontal plane of the furnace shell 1;

[0079] The traction unit 312, movably mounted on the traction frame 311, moves along the vertical direction of the furnace shell 1; and

[0080] The traction member 313, which is movably mounted on the traction part 312, moves radially along the horizontal plane of the furnace shell 1. The end of the traction member 313 away from the inner wall of the furnace shell 1 is movably connected to the heat exchange tube 21.

[0081] In this embodiment, the traction frame 311, traction part 312, and traction member 313, which are movably connected to each other in the traction assembly 31, are used to drive the heat exchange tube 21 to move along the circumferential, axial, and radial directions of the furnace shell 1 under the action of the drive assembly 32. By setting it as a magnetic core material wrapped with heat-resistant material such as aerogel, the magnetic driving effect of the traction assembly 31 is maintained on the outside of the refractory insulation layer 10 of the furnace shell 1, thereby realizing the movement of the movable connection part between the traction assembly 31 and the heat exchange tube 21 in any direction within the furnace shell 1.

[0082] like Figure 3-5 As shown in Figures 8 and 9, the driving component 32 includes:

[0083] Drive frame 321, the drive frame 321 is arranged in the circumferential direction on the outside of the furnace shell 1;

[0084] Drive unit 322, movably mounted on drive frame 321, is used for axial movement along furnace shell 1; and

[0085] The driving component 323 is fixedly mounted on the driving part 322 and has a magnetic field generator 324 fixedly mounted therein, which drives the traction component 313 to move.

[0086] In this embodiment, the drive frame 321, drive section 322, and drive component 323 are respectively arranged in the drive assembly 32. The motors on the drive frame 321 and drive section 322 drive the drive components to move along the circumference and axial direction of the furnace shell 1, respectively. This allows the drive component 323 to be moved to any position on the furnace shell 1. In conjunction with the magnetic field generator 324 on the drive component 323, a magnetic field is formed radially along the horizontal plane of the furnace shell 1 on the outside of the refractory insulation layer 10. This controls the movement of the traction assembly 31 at the corresponding position inside the furnace shell 1. The rotational and reciprocating drive frame 321 and drive section 322, as well as the magnetic field generator 324 in the drive component 323, reduce the volume occupied by the drive assembly 32 between the refractory insulation layer 10 and the metal shell 11 of the furnace shell 1, and ensure the stability of the temperature control process of the furnace shell 1.

[0087] Example 2

[0088] like Figure 2-4 As shown in Figures 8 and 9, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 2 and Embodiment 1 is as follows:

[0089] It also includes a magnetic field generator 324 fixed in the drive assembly 32, the magnetic field generator 324 being arranged in the following positions:

[0090] Drive frame 321, the magnetic field generator 324 is arranged in drive frame 321 outside the furnace shell 1 and is used to form a ring magnetic field in the circumferential direction of the furnace shell 1;

[0091] Drive unit 322, the magnetic field generator 324 is fixed in drive unit 322 on drive frame 321 and used to form a linear magnetic field in the vertical direction of furnace shell 1; and

[0092] The driving component 323, the magnetic field generator 324 is arranged in the driving part 322 and is used to form a linear magnetic field in the radial direction along the horizontal plane of the furnace shell 1, and the positions of the driving component 323 and the traction component 313 correspond to the inner and outer sides of the furnace shell 1.

[0093] In this embodiment, a composite alternating magnetic field is formed on the outside of the refractory insulation layer 10 of the furnace shell 1 by magnetic field generators 324 arranged on the drive frame 321, drive part 322 and drive component 323 of the drive assembly 32, respectively, to control the movement of the traction assembly 31 inside the furnace shell 1. The magnetic field generator 324 reduces the volume occupied by the drive assembly 32 between the refractory insulation layer 10 and the metal shell 11 of the furnace shell 1. The electromagnetism effect can also be used to make the magnetic field generator 324 generate a sufficiently large driving force on the small volume magnetic core material in the traction assembly 31. At the same time, the metal shell 11 of the furnace shell 1 can shield the magnetic field generated by the magnetic field generator 324 from the interference of the external environment, thereby ensuring the stability of the temperature control process of the furnace shell 1.

[0094] Example 3

[0095] like Figure 7 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 3 and Embodiment 1 is as follows:

[0096] The drive assembly 32 also includes a number of magnetic field generators 324 fixed on the furnace shell 1 and arranged in groups. The drive assembly 32 pulls the traction member 313 in the corresponding area inside the furnace shell 1 to move through the magnetic field change between the several adjacent magnetic field generators 324.

[0097] The magnetic field direction of the magnetic field generator 324 includes a ring magnetic field along the circumference of the furnace shell 1 and a linear magnetic field along the axial direction of the furnace shell 1 and the radial direction of the horizontal plane.

[0098] In this embodiment, magnetic field generators 324, such as electromagnetic generators, are evenly distributed on the outside of the furnace shell 1. The composite alternating magnetic field generated by the magnetic field generators 324 causes the annular magnetic field or linear magnetic field generated by the magnetic field generators 324 in the corresponding traction component 31 area to drive the traction component 313 to move along the traction frame 311 or traction part 312. The traction component 31 is driven by the electromagnetic generators of the magnetic field generators 324, thereby adjusting the attitude of the heat exchange tube 21 inside the furnace shell 1. This further reduces the volume occupied by the drive component 32 between the refractory insulation layer 10 and the metal shell 11 of the furnace shell 1, reduces the structural impact on the furnace shell 1, and thus maintains the temperature control effect inside the furnace shell 1.

[0099] Example 4

[0100] like Figure 6 As shown, components that are the same as or corresponding to those in Embodiments 1 to 3 are referred to using the same reference numerals as those in Embodiment 1. For simplicity, only the differences from Embodiments 1 to 3 are described below. The difference between Embodiment 4 and Embodiments 1 to 3 is as follows:

[0101] It also includes a shielding member 325 for limiting the direction of the magnetic field of the magnetic field generator 324, and the shielding member 325 is arranged in the following positions:

[0102] The drive frame 321, wherein the shielding component 325 is arranged in a ring and fixed to the upper and lower end faces of the drive frame 321;

[0103] The drive unit 322, wherein the shielding member 325 is U-shaped and fixed in the vertical circumferential direction of the drive unit 322, and the opening of the U-shaped shielding member 325 faces the furnace shell 1; and

[0104] The drive component 323 and the shield 325 fixed on the drive component 323 are cylindrical in shape, and the axial direction of the cylindrical shield 325 coincides with the radial direction of the drive component 323 corresponding to the horizontal plane of the furnace shell 1.

[0105] In the composite alternating magnetic field formed among multiple magnetic field generators 324 within the drive assembly 32, on the one hand, it is used to drive the movement of the traction assembly 31 within the furnace shell 1 to adjust the posture of the heat exchange tube 21 and improve the temperature control performance within the furnace shell 1. On the other hand, magnetic fields that are close to each other will interfere with each other, affecting the driving effect of the drive assembly 32 on the traction part 312 and the traction component 313. By using shielding components 325 on each magnetic field generator 324 in the drive assembly 32, the magnetic field generated by each magnetic field generator 324 is restricted to act only on the traction part 312 and the traction component 313 inside the furnace shell 1 according to the direction of the magnetic field generated by each magnetic field generator 324, thereby avoiding interference between close magnetic field generators 324, ensuring the driving effect of the drive assembly 32 on the traction assembly 31, maintaining the posture adjustment accuracy of the heat exchange tube 21, and thus improving the temperature control effect within the furnace shell 1.

[0106] Work steps

[0107] Step 1: Before placing the workpiece into the furnace shell 1 for heat treatment, the state parameters of the workpiece are detected, including the position of the workpiece in the furnace shell 1, the size of the workpiece, the temperature, and the thermal inertia, and incorporated into the corresponding parameterized model. Then, the displacement unit 3 and the heating unit 2 are adjusted accordingly, so that the heat exchange tubes 21 in the furnace shell 1, such as electric heating tubes, are adjusted in arrangement under the drive of the traction component 313 of the displacement unit 3, matching the requirements of the workpiece structure in the parameterized model for the optimal shape of the heat exchange tubes 21, the number of heating units 2, and the arrangement of the heating units 2. Then, during the heat treatment process, the heat transfer medium, such as gas at different temperatures, flows through the heat exchange tubes 21 in the furnace shell 1, and the temperature inside the furnace shell 1 is regulated by the thermal radiation of the heat exchange tubes 21 themselves.

[0108] Step 2: Before the workpiece is placed in the furnace shell 1 for heat treatment, according to the detected shape of the workpiece, the displacement unit 3 is driven by the traction component 313 in the displacement unit 3. The displacement unit 3, which is movably connected to the heat exchange tube 21, is connected by a universal joint between them. This causes the adjacent universal joints to move along the non-axial direction of the first tube section 213 and / or the axial direction of the second tube section 214. This causes the heat exchange tube 21 to change its shape under the bending deformation of the first tube section 213 and the expansion and contraction deformation of the second tube section 214. This allows the heat exchange tube 21 to be distributed in a suitable position in the circumferential space of the workpiece, so that the surface of the workpiece and the heat exchange tube 21 in the furnace shell 1 maintain the same distance.

[0109] Step 3: When adjusting the temperature inside the furnace shell 1, heat is conducted through the electric heating tube of the heat exchange tube 21, and the heat of the heat transfer medium is directly adjusted in the heat exchange source 22. The larger space of the external heat exchange source 22 is used to quickly adjust the temperature parameters corresponding to the heat in the heat transfer medium, and the heat transfer medium flows rapidly in the closed loop formed between the heat exchange source 22 and the heat exchange tube 21.

[0110] Step 4: The traction frame 311, traction part 312 and traction component 313, which are movably connected to each other in the traction assembly 31, are used to drive the heat exchange tube 21 to move along the circumferential, axial and radial directions of the furnace shell 1 under the action of the drive assembly 32. By setting it as a magnetic core material wrapped with heat-resistant material such as aerogel, the magnetic drive of the traction assembly 31 is maintained on the outside of the refractory insulation layer 10 of the furnace shell 1, thereby realizing the movement of the movable connection part between the traction assembly 31 and the heat exchange tube 21 in any direction inside the furnace shell 1.

[0111] Step 5: The magnetic field generators 324, which are respectively arranged on the drive frame 321, drive part 322 and drive component 323 in the drive assembly 32, form a composite alternating magnetic field on the outside of the refractory insulation layer 10 of the furnace shell 1 to control the movement of the traction assembly 31 inside the furnace shell 1.

[0112] Step 6: The shielding component 325 installed on each magnetic field generator 324 in the drive assembly 32 restricts the magnetic field generated by each magnetic field generator 324 to act only on the traction part 312 and traction component 313 inside the furnace shell 1, thereby avoiding interference between adjacent magnetic field generators 324, ensuring the driving effect of the drive assembly 32 on the traction assembly 31, and maintaining the attitude adjustment accuracy of the heat exchange tube 21.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A temperature control system for a muffle-free heat treatment furnace, comprising a furnace shell, characterized in that, Also includes: A heating unit, which is arranged inside the furnace shell, is used to regulate the temperature parameters inside the furnace shell; as well as The displacement unit, which is connected to the heating unit, is movably located inside the furnace shell. The displacement unit is used to carry the heating unit to move within the furnace shell. The heating unit includes a heat exchange tube movably mounted on the displacement unit, with the heat exchange tube located in the circumferential direction of the workpiece inside the furnace shell; The heat exchange tube includes a first tube for heating the furnace shell and a second tube for cooling the furnace shell. The workpiece is placed in the furnace shell for heat treatment. The displacement unit pulls the heat exchange tube in the heating unit to move, changing the shape of the heat exchange tube, the number of heating units and the arrangement of the heating units in the furnace shell. This allows the heat of the heat transfer medium in the heat exchange tube, which is higher or lower than the furnace shell temperature, to be conducted to the furnace shell along the first or second pipe fitting, thereby controlling the temperature parameters inside the furnace shell. The heat exchange tube is made of a flexible material and includes a first tube section for bending deformation and a second tube section for expansion and contraction deformation. The first pipe segment and the second pipe segment are alternately arranged, and the connection between the first pipe segment and the second pipe segment is movably connected to the displacement unit; The displacement unit includes a traction component and a drive component that are movably disposed on the inner and outer sides of the furnace shell, respectively. The traction component and the drive component adopt magnetic transmission. Multiple connection points are provided between the traction component and the heat exchange tube. The movement of the drive component on the outside of the furnace shell causes the traction component to move synchronously on the inside of the furnace shell. The posture of the heat exchange tube is adjusted by the change in the position of the connection point between the traction component and the heat exchange tube. The traction assembly is a magnetic core material wrapped with heat-resistant material, and the traction assembly includes: A traction frame, which is circumferentially rotatable along the horizontal plane of the furnace shell; The traction unit, movably mounted on the traction frame, moves vertically along the furnace shell; and The traction component, which is movably mounted on the traction unit, moves radially along the horizontal plane of the furnace shell. The end of the traction component away from the inner wall of the furnace shell is movably connected to the heat exchange tube. The driving component includes: A drive frame, the drive frame being arranged circumferentially on the outer side of the furnace shell; The drive unit, movably mounted on the drive frame, is used for axial movement along the furnace shell; and The driving component, which is fixed on the driving part, has a magnetic field generator fixed in place to drive the traction component to move. It also includes a magnetic field generator fixed in the drive assembly, and the magnetic field generator is arranged in the following positions: The drive frame, wherein the magnetic field generator is arranged in the drive frame outside the furnace shell and is used to form a ring magnetic field in the circumferential direction of the furnace shell; The drive unit, in which the magnetic field generator is fixedly mounted on the drive frame and used to form a linear magnetic field in the vertical direction of the furnace shell; and The driving component, wherein the magnetic field generator is arranged within the driving component in the driving part and is used to form a linear magnetic field radially along the horizontal plane of the furnace shell, and the positions of the driving component and the traction component correspond to the inner and outer sides of the furnace shell.

2. The temperature control system for a muffle-free well-type heat treatment furnace according to claim 1, characterized in that, It also includes a heat exchange source for supplying heat exchange medium to the heat exchange tubes. The heat exchange source is arranged outside the furnace shell and forms a closed loop with the heat exchange tubes. The heat exchange source keeps the heat transfer medium in the heat exchange tubes in a flowing state.

3. The temperature control system for a muffle-free heat treatment furnace according to claim 2, characterized in that, It also includes a heating section for providing a heat source to the heat exchange tube. The heating section is movably disposed between the first tube section and the second tube section of the heat exchange tube. A heat source is fixed inside the heating section, and the outside of the heating section is movably connected to the displacement unit.

4. The temperature control system for a muffle-free well-type heat treatment furnace according to claim 1, characterized in that, The drive assembly also includes several magnetic field generators fixed on the furnace shell and arranged in groups. The drive assembly pulls the traction component in the corresponding area inside the furnace shell to move by the magnetic field change between several adjacent magnetic field generators. The magnetic field direction of the magnetic field generator includes a ring magnetic field along the circumference of the furnace shell and a linear magnetic field along the axial direction of the furnace shell and the radial direction of the horizontal plane.

5. The temperature control system for a muffle-free well-type heat treatment furnace according to claim 4, characterized in that, It also includes a shielding component for limiting the direction of the magnetic field of the magnetic field generator, and the shielding component is arranged in the following positions: The drive frame, wherein the shielding component is arranged in a ring and fixed to the upper and lower end faces of the drive frame; The drive unit, wherein the shielding member is arranged in an inverted shape and fixed in the vertical circumferential direction of the drive unit, with the opening of the inverted shielding member facing the furnace shell; and The drive unit and the shielding component fixed on the drive unit are cylindrical in shape, and the axial direction of the cylindrical shielding component coincides with the radial direction of the horizontal plane of the furnace shell corresponding to the drive unit.

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