Tension annealing device for strip

Abstract

The tension annealing device comprises a sectional area detection device and an annealing furnace which are sequentially arranged on a strip conveying path, wherein the sectional area detection device is used for detecting sectional area information of a strip to enter the annealing furnace; the annealing furnace comprises a tension applying device, and the tension applying device applies target tension to the strip entering the annealing furnace at least based on the sectional area information. Therefore, the consistency of the nanocrystalline strip obtained through tension annealing is improved.

Description

Technical Field

[0001] The invention relates to the technical field of annealing, and in particular to a tension annealing device for a strip. Background Art

[0002] Nanocrystalline alloys are obtained by annealing and crystallizing amorphous alloys. The amorphous phase is a metastable phase, and a higher energy barrier must be overcome to convert it into a crystalline state, so the crystallization process needs to provide sufficient free energy. The commonly used method is the tension method, that is, the tension annealing heat treatment method is used to anneal and crystallize the amorphous alloy to obtain a nanocrystalline alloy.

[0003] Existing tension annealing devices mainly perform tension annealing on amorphous nanocrystalline ribbons to obtain nanocrystalline ribbons, but the consistency of the nanocrystalline ribbons is poor. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In response to the current problems, an embodiment of the present invention provides a tension annealing device for a strip, the tension annealing device comprising: a cross-sectional area detection device and an annealing furnace arranged in sequence on the strip transmission path; wherein the cross-sectional area detection device is used to detect the cross-sectional area information of the strip to enter the annealing furnace; the annealing furnace comprises a tension applying device, and the tension applying device applies a target tension to the strip entering the annealing furnace based at least on the cross-sectional area information.

[0006] In some embodiments of the present application, the tension applying device includes: two first tension roller groups located on the strip transfer path and arranged at intervals; wherein the cross-sectional area information includes: first cross-sectional area information of the strip that is about to enter between the two first tension roller groups; the tension applying device dynamically adjusts the rotational speed difference between the two first tension roller groups based at least on the first cross-sectional area information to apply a target tension to the strip between the two first tension roller groups.

[0007] In some embodiments of the present application, the annealing furnace also includes a first temperature control device for controlling the annealing temperature at a target annealing temperature; the tension applying device dynamically adjusts the rotational speed difference between the two first tension roller groups based at least on the first cross-sectional area information and the target annealing temperature to apply the target tension to the strip entering the annealing furnace.

[0008] In some embodiments of the present application, the tension applying device dynamically adjusts the speed difference between the two first tension roller groups based on the first cross-sectional area information, the target annealing temperature, and the cross-sectional area-speed difference correspondence relationship to apply the target tension to the strip entering the annealing furnace; wherein the cross-sectional area-speed difference correspondence relationship is obtained by testing the annealing furnace based on the target annealing temperature and the target tension.

[0009] In some embodiments of the present application, the number of annealing furnaces is at least two; the target annealing temperatures of different annealing furnaces are different, and / or the target tensions of different annealing furnaces are different.

[0010] In some embodiments of the present application, the cross-sectional area detection device includes: two second tension roller groups located on the strip transfer path and spaced apart, the rotational speed difference between the two second tension roller groups being maintained at a preset rotational speed difference; and a tension detection device for detecting tension change information of the strip between the two second tension roller groups; wherein the cross-sectional area information includes: second cross-sectional area information of the strip between the two second tension roller groups; the cross-sectional area detection device determines the second cross-sectional area information based at least on the tension change information and the preset rotational speed difference, and calculates the first cross-sectional area information based on the second cross-sectional area information.

[0011] In some embodiments of the present application, the spacing between the two first tension roller groups is a first spacing, and the spacing between the two second tension roller groups is a second spacing; wherein the first spacing is an integer multiple of the second spacing.

[0012] In some embodiments of the present application, the cross-sectional area detection device also includes a second temperature control device for controlling the detection temperature at a preset detection temperature, and the preset detection temperature is lower than the target annealing temperature of the annealing furnace; the cross-sectional area detection device determines the second cross-sectional area information based at least on the tension change information, the preset rotation speed difference and the preset detection temperature.

[0013] In some embodiments of the present application, the cross-sectional area detection device determines the second cross-sectional area information based on the tension change information, the preset rotation speed difference, the preset detection temperature, and the cross-sectional area-tension correspondence relationship; The cross-sectional area-tension correspondence is obtained by testing the cross-sectional area detection device based on a preset detection temperature and a preset rotation speed difference.

[0014] In some embodiments of the present application, the tension annealing device further includes: a cooling furnace disposed on the strip transfer path and located after the annealing furnace; and a temperature detection device for detecting the temperature of the strip at the outlet of the cooling furnace.

[0015] According to the tension annealing device of the strip provided by the present invention, a cross-sectional area detection device is added to detect the cross-sectional area information of the strip to be entered into the annealing furnace, so that the tension applying device applies the target tension to the strip entering the annealing furnace based on at least the cross-sectional area information. The present application takes into account the influence of the cross-sectional area change of the strip on the consistency of the nanocrystalline strip obtained by tension annealing. When the cross-sectional area of ​​the strip to be entered into the annealing furnace changes, the tension applying device can be adjusted based on the change of the cross-sectional area information to ensure that a constant target tension is applied to the strip entering the annealing furnace, so as to improve the consistency of the nanocrystalline strip obtained by tension annealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following drawings of the present invention are used to understand the present invention as part of the present invention. The embodiments of the present invention are shown in the drawings and the description thereof is used to explain the principle of the present invention.

[0017] In the attached figure: Figure 1 A schematic block diagram of a strip tension annealing device according to an embodiment of the present invention is shown; Figure 2 A schematic cross-sectional view of a tension annealing device for a strip according to another embodiment of the present invention is shown; Figure 3 A schematic cross-sectional structure diagram of a strip tension annealing device according to another embodiment of the present invention is shown.

[0018] Reference numerals: 10- Strip 20- Cross-sectional area detection device 21-Second tension roller group 22-Tension detection device 30- Annealing furnace 31- Tension applying device 32-first tension roller group 40-cooling furnace 41-third tension roller group 42-temperature detection device 50-Atmosphere gas inlet DETAILED DESCRIPTION

[0019] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0020] It should be understood that the present invention can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present invention to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0021] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there may be no intervening elements or layers. It should be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.

[0022] Spatially relative terms such as "under," "below," "below," "under," "above," "above," etc., may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that in addition to the orientations shown in the figures, the spatially relative terms are intended to include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "on" the other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0023] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0024] Nanocrystalline alloys are obtained by annealing and crystallizing amorphous alloys. The amorphous phase is a metastable phase, and a high energy barrier must be overcome to convert it into a crystalline state, so the crystallization process needs to provide sufficient free energy. Currently, the commonly used production methods to provide energy for the crystallization process of amorphous materials include heating, magnetization, pressure and tension. Among them, magnetization and heating are relatively mature; pressure has not been widely used because of its slow production efficiency; the tension method is limited by the fact that long-term crystallization forms a periodic nano-stripe structure inside, which leads to a sharp increase in the brittleness of the strip.

[0025] Current research results have shown that amorphous materials undergo α relaxation and β relaxation during annealing. The former (α relaxation) mainly occurs during long-term annealing at high temperature, and has no obvious effect on soft magnetic properties, but will greatly reduce mechanical properties; the latter (β relaxation) mainly occurs during short-term annealing at low temperature, and has no effect on mechanical properties, but can significantly improve soft magnetic properties. β relaxation can be activated by stress and is strongly associated with the grain nucleation process.

[0026] Among them, stress activation can be achieved through tension annealing heat treatment. Therefore, tension annealing heat treatment needs to provide as much tension as possible while keeping warm. However, the increased brittleness after annealing makes the strip easy to break, resulting in a limited tension value applied during the tension annealing process.

[0027] Regarding the tension annealing method, the related technology uses static tension equipment to apply tension to the strip, avoiding the problem of strip breakage caused by mechanical vibration, equipment offset and other problems, and realizing isothermal tension / magnetic field coupling annealing. The related technology also uses multiple separate heating furnace units, adjusts the tension of each heating furnace body through tension fine-tuning rollers, and synchronously adjusts the tension during the cooling process, realizing tension-magnetic field coupling annealing.

[0028] However, the existing strip production method cannot produce strips with completely consistent thickness and width or very small deviation, resulting in poor consistency of amorphous nanocrystalline strips subjected to tension annealing. The present application found that if only a tension roller is used to maintain a constant speed difference to apply a so-called "constant" tension to the strip in each heating furnace, in fact, due to the difference in the cross-sectional area of ​​the strip, the tension applied to different sections of the strip will have a certain difference. The difference in tension will cause a significant difference in the degree of crystallization of the amorphous strip, which will lead to poor consistency of the final nanocrystalline strip.

[0029] In addition, in actual engineering applications, high-temperature annealing often requires a higher temperature. In some scenarios, the annealing temperature needs to be maintained above 600°C. There is currently no tension sensor that can work at high-temperature annealing temperatures, and it is not possible to place a tension sensor separately in each annealing furnace to detect the tension change information applied to the strip. Related technologies usually establish tension detection and control systems at both ends of the strip being tension annealed, and cannot perform tension detection and control on individual temperature zones. That is, there is no practical method in the current tension annealing furnace to accurately control the tension of strips in different temperature zones.

[0030] Therefore, in view of the existence of the aforementioned technical problems, reference Figure 1 The embodiment of the present invention provides a tension annealing device for a strip 10, which includes: a cross-sectional area detection device 20 and an annealing furnace 30 which are sequentially arranged on the transmission path of the strip 10. The strip 10 to be tension annealed first passes through the cross-sectional area detection device 20, and then enters the annealing furnace 30 for annealing after exiting the cross-sectional area detection device 20.

[0031] The cross-sectional area detection device 20 is used to detect the cross-sectional area information of the strip 10 that will enter the annealing furnace 30. The annealing furnace 30 includes a tension applying device 31, which applies a target tension to the strip 10 entering the annealing furnace 30 based at least on the cross-sectional area information.

[0032] In the related technology, at the beginning of tension annealing, only the cross-sectional area information of a part of the strip is statically obtained as the cross-sectional area information of the strip. Then, based on the cross-sectional area information of the strip obtained, the target tension is applied to the strip entering the annealing furnace. While the strip is moving along the transfer path, although the strip entering the annealing furnace will continue to change, based on the small change in the cross-sectional area of ​​the strip, the cross-sectional area of ​​the strip in the annealing furnace is assumed to remain unchanged, so that the target tension can be continuously applied to the strip by default. In the related technology shown above, due to the poor consistency of the strips currently produced, its cross-sectional area cannot be kept constant or the error is kept in a very small and negligible range. As the strip moves along the transfer path, the cross-sectional area of ​​the strip entering the annealing furnace changes, which causes the actual tension applied to the strip to fluctuate, that is, the actual tension applied to the strip will not remain constant at the target tension. When the actual tension applied to the strip changes, it will affect the consistency of the nanocrystalline strip obtained by tension annealing.

[0033] The above embodiment of the present application has the following specific beneficial effects: Compared with the method of intercepting the cross-sectional area value of a part of the strip 10 as the cross-sectional area information of the strip 10 in the related art, the above embodiment adds a cross-sectional area detection device 20 to detect the cross-sectional area information of the strip 10 to enter the annealing furnace 30, and determines whether the cross-sectional area of ​​the strip 10 to enter the annealing furnace 30 changes, so that the tension applying device 31 applies the target tension to the strip 10 entering the annealing furnace 30 at least based on the cross-sectional area information. The above embodiment takes into account the influence of the cross-sectional area change of the strip 10 on the consistency of the nanocrystalline strip 10 obtained by tension annealing. When the cross-sectional area of ​​the strip 10 to enter the annealing furnace 30 changes, the tension applying device 31 can be adjusted based on the cross-sectional area information to ensure that the actual tension applied to the strip 10 entering the annealing furnace 30 is equal to the constant target tension, thereby improving the consistency of the nanocrystalline strip 10 obtained by tension annealing. The above structures are described in detail below in conjunction with the accompanying drawings.

[0034] For example, the strip 10 to be tension annealed may be an amorphous nanocrystalline strip 10, which is subjected to tension annealing to obtain a nanocrystalline strip 10. The strip 10 refers to a long strip structure with a constant cross section or a slightly changed cross section.

[0035] Exemplarily, the strip 10 described above can adjust the brittleness level after annealing by adding trace elements such as Co and Ni to meet the needs of normal production.

[0036] In the process of tension annealing the strip 10 by the tension annealing device shown above, the strip 10 is not cut, but the strip 10 is passed through, such as but not limited to, an unwinding device, a conveyor belt device, a winding device, etc., so that the strip 10 is tension annealed during the movement. In the process of tension annealing, the strip 10 moves along the transmission path through, such as but not limited to, a tension roller, a transmission roller, etc. Specifically, the strip 10 first enters the cross-sectional area detection device 20 to detect the cross-sectional area information, and the strip 10 that exits the cross-sectional area detection device 20 then enters the annealing furnace 30 for annealing.

[0037] There are many ways to arrange the cross-sectional area detection device 20 and the annealing furnace 30. Some of the ways are described as follows.

[0038] In some embodiments, the detection method of the cross-sectional area detection device 20 is related to the type of the tension applying device 31 in the annealing furnace 30. For example, the tension applying device 31 can apply tension by, for example, but not limited to, a tension roller, or can apply tension on the strip 10 by other methods such as pulling. Correspondingly, the detection method of the cross-sectional area detection device 20 can also be adjusted accordingly.

[0039] For example, when tension is applied to the strip 10 by a tension roller, the principle is to adjust the speed difference between the two tension roller groups to adjust the tension applied to the strip 10 between the two tension roller groups. At this time, the cross-sectional area information detected by the cross-sectional area detection device 20 may be the cross-sectional area information of the section of the strip 10 between the two tension roller groups that will enter the annealing furnace 30. Exemplarily, the cross-sectional area information may be the average cross-sectional area information of the section of the strip 10. Correspondingly, the cross-sectional area detection device 20 may be a detection device capable of detecting the average cross-sectional area information of a certain section of the strip 10.

[0040] In other embodiments, the detection method of the cross-sectional area detection device 20 and the detection method of the tension applying device 31 of the annealing furnace 30 may also be independent of each other and unrelated.

[0041] As follows, some exemplary configurations of the annealing furnace 30 and the cross-sectional area detection device 20 are introduced.

[0042] When setting up the annealing furnace 30 and the tension applying device 31, various methods may be adopted, and some methods are exemplarily introduced as follows.

[0043] Exemplary, reference Figure 1 and Figure 2, the tension applying device 31 may include: two first tension roller groups 32 located on the transmission path of the strip 10 and spaced apart. The cross-sectional area information includes: the first cross-sectional area information of the strip 10 that will enter between the two first tension roller groups 32; at this time, the tension applying device 31 dynamically adjusts the speed difference of the two first tension roller groups 32 based on at least the first cross-sectional area information, so as to apply the target tension to the strip 10 between the two first tension roller groups 32.

[0044] The above embodiment has the following beneficial effects: by adopting two first tension roller groups 32 as a way to apply tension to the strip 10, the structure of the tension applying device 31 can be simplified, and it is also beneficial to realize tension annealing of the strip 10 during the movement of the strip 10. It is also convenient to adjust the actual tension applied to the strip 10 between the two first tension roller groups 32 by adjusting the speed difference of the two first tension roller groups 32. When the cross-sectional area of ​​the strip 10 that is about to enter between the two first tension roller groups 32 changes, it will be reflected in the above-mentioned first cross-sectional area information. Afterwards, based on the first cross-sectional area information, the speed difference of the two first tension roller groups 32 is dynamically adjusted to ensure that the actual tension applied to the strip 10 between the two first tension roller groups 32 is always kept at the target tension, thereby improving the consistency of the nanocrystalline strip 10 obtained by tension annealing.

[0045] Specifically, refer to Figure 2 , the strip 10 can be driven to move along the transfer path of the strip 10 by adjusting the rotation speeds of the two first tension roller groups 32; and the rotation speed difference between the two first tension roller groups 32 can also be adjusted to adjust the tension applied to the strip 10 between the two first tension roller groups 32. When adjusting the rotation speed difference between the two first tension roller groups 32, the above embodiment dynamically adjusts the rotation speed difference between the two first tension roller groups 32 based on the first cross-sectional area information of the strip 10 that will enter between the two first tension roller groups 32, with the target tension applied to the strip 10 between the two first tension roller groups 32 as the adjustment target, to achieve the above adjustment target, and ensure that the actual tension applied to the strip 10 between the two first tension roller groups 32 is always kept at the target tension, thereby improving the consistency of the obtained nanocrystalline strip 10.

[0046] It should be noted that the first cross-sectional area information of the strip 10 that is about to enter between the two first tension roller groups 32 may be a variety of information characterizing the cross-sectional area change. For example, the first cross-sectional area information may refer to: the average cross-sectional area information of the strip 10 between the two first tension roller groups 32.

[0047] Exemplarily, the annealing furnace 30 may also include a first temperature control device (not shown in the figure) for controlling the annealing temperature at a target annealing temperature. At this time, the tension applying device 31 dynamically adjusts the speed difference of the two first tension roller groups 32 based at least on the first cross-sectional area information and the target annealing temperature to apply the target tension to the strip 10 entering the annealing furnace 30. That is, when the first temperature control device is provided in the annealing furnace 30, the tension applying device 31 dynamically adjusts the speed difference of the two first tension roller groups 32 based on the target annealing temperature in addition to the first cross-sectional area information to ensure that the actual tension applied to the strip 10 entering the annealing furnace 30 is equal to the target tension.

[0048] The above embodiment has the following beneficial effects: the influence of the annealing temperature of the strip 10 on the tension annealing effect is also considered, and the annealing temperature of the annealing furnace 30 is controlled at a constant target annealing temperature through the first temperature control device, so that the degree of thermal deformation of the strip 10 entering the annealing furnace 30 is consistent, so that when the speed difference between the two first tension roller groups 32 is dynamically adjusted, it is also based on the target annealing temperature to ensure that the actual tension applied to the strip 10 entering the annealing furnace 30 remains at the target tension, thereby improving the consistency of the obtained nanocrystalline strip 10.

[0049] Exemplary, reference Figure 1 and Figure 2 When the tension applying device 31 uses the first tension roller group 32, the tension applying device 31 dynamically adjusts the speed difference of the two first tension roller groups 32 based on the first cross-sectional area information, the target annealing temperature, and the cross-sectional area-speed difference correspondence relationship to apply the target tension to the strip 10 entering the annealing furnace 30. The cross-sectional area-speed difference correspondence relationship is obtained by testing the annealing furnace 30 based on the target annealing temperature and the target tension.

[0050] The above embodiment has the following beneficial effects: when dynamically adjusting the speed difference between the two first tension roller groups 32, it is also based on the cross-sectional area-speed difference correspondence, wherein the cross-sectional area-speed difference correspondence is obtained by testing the annealing furnace 30 based on the target annealing temperature and the target tension, thereby being able to consider the influence of the overall structure of the annealing furnace 30 on the tension annealing, and being able to more accurately and quantitatively adjust the speed difference between the two first tension roller groups 32 to ensure that the actual tension applied to the strip 10 entering the annealing furnace 30 is maintained at the target tension, thereby improving the consistency of the obtained nanocrystalline strip 10.

[0051] It should be noted that the reference Figure 2There is a speed difference ΔV between the two first tension roller groups 32 in the annealing furnace 30, and the speed difference ΔV is in a stable functional relationship with the actual tension of the strip 10 in the annealing furnace 30: F=f(ΔV). This function is a nonlinear function, which is related to the cross-sectional area of ​​the strip 10, the annealing temperature, the actual furnace installation conditions, etc.

[0052] During the application process, before each individual annealing furnace 30 leaves the factory, a characteristic curve of the actual tension and speed difference / annealing temperature of the annealing furnace 30, i.e., F=f(ΔV, T), can be individually tested with a dedicated testing device, and F=f(ΔV, T) can be saved in the tension annealing device or the control system of the annealing furnace 30, and the characteristic curve can be verified and tested regularly.

[0053] During the application process, refer to Figure 2 , the annealing temperature of the annealing furnace 30 can be set to the target annealing temperature, and the actual tension of the strip 10 can be maintained at the target tension. The target annealing temperature and the target tension are preset in advance and can be adjusted according to the type of the strip 10. When the target annealing temperature and the target tension are known and remain unchanged, the corresponding relationship between the cross-sectional area and the rotation speed difference can be measured in advance, and then the rotation speed difference can be adjusted accordingly according to the cross-sectional area information detected by the cross-sectional area detection device 20, so that the actual tension of the strip 10 between the two first tension roller groups 32 is maintained at the target tension.

[0054] Exemplarily, the number of annealing furnaces 30 is at least two. Specifically, the number of annealing furnaces 30 can be any value of two, three, four, or not less than two. The target annealing temperatures of different annealing furnaces 30 are different, and / or the target tensions of different annealing furnaces 30 are different. That is, at least one of the two indicators of target annealing temperature and target tension in different annealing furnaces 30 is different. Thus, zoned temperature-controlled tension annealing of the strip 10 is achieved.

[0055] Exemplarily, the number of annealing furnaces 30 can be three, that is, the above-mentioned annealing furnace 30 is a three-annealing furnace 30 architecture. The target annealing temperatures of the three annealing furnaces 30 can be 510° C., 590° C., and 400° C., respectively. The target tensions of the three annealing furnaces 30 can be 15N, 20N, and 10N, respectively. In the above manner, it is possible to achieve separate and precise tension control of multiple annealing temperature zones.

[0056] Exemplarily, the furnace wall of each annealing furnace 30 may be made of a heat-insulating structure to avoid unnecessary energy loss.

[0057] Exemplarily, when there are multiple annealing furnaces 30, the multiple annealing furnaces 30 can form a whole. Except for the position where the strip 10 passes through, the other furnace walls of different annealing furnaces 30 are isolated by insulation structures to avoid different target annealing temperature areas directly affecting each other, resulting in the inability to accurately control the annealing temperature.

[0058] It should be noted that when there are multiple annealing furnaces 30, each annealing furnace 30 can be tested based on the target annealing temperature and target tension of the annealing furnace 30 to obtain the corresponding relationship between the cross-sectional area and the rotation speed difference of the annealing furnace 30, so as to perform the above-mentioned actual tension adjustment.

[0059] When setting the cross-sectional area detection device 20, a variety of methods may be used, and some of the setting methods are exemplarily introduced below.

[0060] Exemplary, reference Figure 2 The cross-sectional area detection device 20 may include: two second tension roller groups 21 located on the transmission path of the strip 10 and spaced apart, and the speed difference between the two second tension roller groups 21 is maintained at a preset speed difference. The cross-sectional area detection device 20 may also include a tension detection device 22, and the tension detection device 22 is used to detect the tension change information of the strip 10 between the two second tension roller groups 21. The cross-sectional area information includes: the second cross-sectional area information of the strip 10 between the two second tension roller groups 21. The cross-sectional area detection device 20 also determines the second cross-sectional area information based on at least the tension change information and the preset speed difference, and calculates the first cross-sectional area information based on the second cross-sectional area information.

[0061] The above embodiment has the following beneficial effects: by adopting two second tension roller groups 21 and a tension detection device 22 to form a cross-sectional area detection device 20, the second cross-sectional area information of the strip 10 between the two second tension roller groups 21 is first detected, and then the first cross-sectional area information is determined based on the second cross-sectional area information, thereby facilitating the adjustment of the rotation speed difference between the two first tension roller groups 32.

[0062] refer to Figure 2 When calculating the first cross-sectional area information based on the second cross-sectional area information, it is necessary to use the first spacing between the two first tension roller groups 32 and the second spacing between the two second tension roller groups 21. The accuracy of the first cross-sectional area information calculated based on the second cross-sectional area information can be improved by adjusting the relationship between the first spacing and the second spacing.

[0063] Exemplarily, the distance between the two first tension roller groups 32 is a first distance, referring to Figure 2 The first spacing can be represented by D1. The spacing between the two second tension roller groups 21 is the second spacing, refer to Figure 2, the second spacing can be represented by D2. The first spacing D1 is an integer multiple of the second spacing D2.

[0064] The above embodiment has the following beneficial effects: the second cross-sectional area information obtained by the above calculation is the average cross-sectional area information of the strip 10 between the two second tension roller groups 21, and by making the first spacing an integer multiple of the second spacing, the first cross-sectional area information calculated based on the second cross-sectional area information is the average cross-sectional area information of the strip 10 between the two first tension roller groups 32, thereby improving the accuracy of adjusting the rotation speed difference between the two first tension roller groups 32.

[0065] Exemplary, reference Figure 2 The first spacing D1 can be any integer multiple of the second spacing D2, such as one, two, or three times. For example, the second spacing between the two second tension roller groups 21 in the cross-sectional area detection device 20 can be equal to the first spacing between the two first tension roller groups 32. Figure 2 The first spacing D1 is equal to the second spacing D2. Of course, in other embodiments, the first spacing D1 may be twice, three times, four times, etc., of the second spacing D2.

[0066] Exemplary, reference Figure 2 The annealing time in each annealing furnace 30 can be controlled by the rotation speed of the first tension roller group 32 and the first spacing D1 of the first tension roller group 32. Specifically, the first spacing D1 divided by the rotation speed of the first tension roller group 32 is the annealing time in the annealing furnace 30.

[0067] In addition, the overall annealing time of the strip 10 is also related to the number of annealing furnaces 30. One or more annealing furnaces 30 can be set in the above manner, and different target annealing temperatures and target tensions can be set to perform multi-annealing temperature zone tension annealing control.

[0068] Exemplarily, when there are multiple annealing furnaces 30, the sizes of different annealing furnaces 30 may be the same or different. When the sizes of different annealing furnaces 30 are different, since the relationship between the different sizes cannot be accurately calculated, in some embodiments, each size requires a corresponding cross-sectional area detection device 20 to avoid deviation caused by the size. For example, the first spacing D1 in different annealing furnaces 30 may be equal or unequal.

[0069] Exemplarily, when there are multiple annealing furnaces 30, multiple annealing furnaces 30 may share one cross-sectional area detection device 20. At this time, preferably, the second spacing D2 between the two second tension roller groups 21 in the cross-sectional area detection device 20 may be the greatest common divisor of the first spacing D1 between the two first tension roller groups 32 in all annealing furnaces 30. Thus, the first spacing of each annealing furnace 30 is an integer multiple of the second spacing of the cross-sectional area detection device 20.

[0070] For example, there are three annealing furnaces 30, and the first spacing D1 in the three annealing furnaces 30 can be 5 units, 10 units, and 15 units respectively. Then, only one cross-sectional area detection device 20 can be provided, and the second spacing D2 between the two second tension roller groups 21 in the cross-sectional area detection device 20 can be 5 units.

[0071] In other embodiments, when there are multiple annealing furnaces 30 , a corresponding cross-sectional area detection device 20 may be provided for each annealing furnace 30 , so that the first spacing of each annealing furnace 30 is an integer multiple of the second spacing of the corresponding cross-sectional area detection device 20 .

[0072] For example, there are three annealing furnaces 30, and the first spacing D1 in the three annealing furnaces 30 can be 5 units, 10 units, and 15 units, respectively. Then three cross-sectional area detection devices 20 can be provided, and the three cross-sectional area detection devices 20 correspond to the three annealing furnaces 30 one by one. Among them, the second spacing D2 in the cross-sectional area detection device 20 corresponding to the annealing furnace 30 with a first spacing D1 of 5 units can be 5 units. The second spacing D2 in the cross-sectional area detection device 20 corresponding to the annealing furnace 30 with a first spacing D1 of 10 units can be 10 units. The second spacing D2 in the cross-sectional area detection device 20 corresponding to the annealing furnace 30 with a first spacing D1 of 15 units can be 15 units.

[0073] Exemplarily, the cross-sectional area detection device 20 may further include a second temperature control device (not shown in the figure) for controlling the detection temperature at a preset detection temperature, and the preset detection temperature is lower than the target annealing temperature of the annealing furnace 30. The cross-sectional area detection device 20 determines the second cross-sectional area information based on at least the tension change information, the preset rotation speed difference and the preset detection temperature.

[0074] The above embodiment has the following beneficial effects: by providing a second temperature control device in the cross-sectional area detection device 20, the detection temperature is controlled at a preset detection temperature lower than the target annealing temperature, thereby reducing the high temperature resistance requirement of the tension detection device 22 used in the cross-sectional area detection device 20, and using a tension detection device 22 that is not resistant to high temperatures, thereby reducing the configuration difficulty of the tension detection device 22, that is, tension detection can be completed using the existing tension detection device 22. In addition, the cross-sectional area detection device 20 determines the second cross-sectional area information based on the preset detection temperature in addition to the tension change information and the preset speed difference, thereby improving the accuracy of the determined second cross-sectional area information.

[0075] When the tension detection device 22 is provided, the tension detection device 22 may use a tension sensor, which is provided between the two second tension roller groups 21 to detect the tension of the strip 10 between the two second tension roller groups 21. It should be noted that the tension detected by the tension sensor can be used as the average tension of the strip 10 between the two tension roller groups, and correspondingly, the second cross-sectional area information calculated based on the tension detected by the tension sensor is the average cross-sectional area information of the strip 10 between the two second tension roller groups 21.

[0076] Exemplarily, the cross-sectional area detection device 20 determines the second cross-sectional area information based on the tension change information, the preset rotational speed difference, the preset detection temperature, and the cross-sectional area-tension correspondence; wherein the cross-sectional area-tension correspondence is obtained by testing the cross-sectional area detection device 20 based on the preset detection temperature and the preset rotational speed difference.

[0077] The above-mentioned embodiment has the following beneficial effects: the cross-sectional area detection device 20 is tested in advance based on a preset detection temperature and a preset rotational speed difference to obtain a cross-sectional area-tension correspondence relationship. Then, during the application process, the detection temperature of the cross-sectional area detection device 20 is controlled at the preset detection temperature, and the rotational speed difference between the two second tension roller groups 21 is maintained at the preset rotational speed difference. By real-time detection of tension change information, and based on the real-time detected tension change information and the cross-sectional area-tension correspondence relationship, the second cross-sectional area information can be calculated, which not only simplifies the difficulty of cross-sectional area detection, but also improves the accuracy of cross-sectional area detection.

[0078] It should be noted that when there are multiple cross-sectional area detection devices 20, each cross-sectional area detection device 20 is tested in advance based on a preset detection temperature and a preset rotation speed difference to obtain a cross-sectional area-tension correspondence relationship, and then the cross-sectional area detection device 20 uses the above-mentioned method to detect the cross-sectional area information of the strip 10 passing through the cross-sectional area detection device 20.

[0079] Exemplary, reference Figure 2The cross-sectional area detection device 20 may further include a furnace body for accommodating two second tension roller groups 21, the tension detection device 22 and the second temperature control device, so as to achieve heat isolation between the cross-sectional area detection device 20 and the outside world, and simplify the control of the detection temperature of the cross-sectional area detection device 20.

[0080] For example, the tension sensor disposed between the two second tension roller groups 21 can detect in real time the actual tension on the strip 10 at a predetermined preset detection temperature and a predetermined preset speed difference, and can obtain the actual tension deviation caused by the difference in the cross-sectional area of ​​the strip 10. This deviation is proportional to the actual tension, so the second cross-sectional area information of the strip 10 between the two second tension roller groups 21 can be directly calculated. Then, the first cross-sectional area information can be calculated based on the second cross-sectional area information.

[0081] As follows, Figure 2 The tension detection device 22 is taken as an example to illustrate the specific working process.

[0082] First, the time when a section of the strip 10 appears in the annealing furnace 30 can be calculated based on the rotational speed of all the tension roller groups in the tension detection device 22, and the rotational speed difference between the two first tension roller groups 32 in the annealing furnace 30 can be adjusted when the section of the strip 10 reaches a predetermined position (for example, when the section of the strip 10 enters between the two first tension roller groups 32) so that the actual tension between the two first tension roller groups 32 is maintained at the target tension.

[0083] Furthermore, the detection interval of the cross-sectional area detection device 20 can be the second spacing D2 between the two second tension roller groups 21 divided by the moving speed of the strip 10 and then multiplied by 2, that is, in the strip 10 between the two second tension roller groups 21, each half of the strip 10 is detected and calibrated once. Specifically, the detection interval of the cross-sectional area detection device 20 is the detection interval of the tension detection device 22, and each time the second cross-sectional area information is obtained, the first cross-sectional area information is calculated based on the latest second cross-sectional area information. Correspondingly, since the strip 10 is transmitted sequentially along the transmission path, each time the first cross-sectional area information is obtained, the speed difference between the two first tension roller groups 32 can be adjusted accordingly, so that the actual tension of the strip 10 between the two first tension roller groups 32 is maintained at the target tension.

[0084] Of course, it should be noted that the detection interval of the cross-sectional area detection device 20 is not limited to that described in the above example. In addition, real-time detection can also be performed to ensure more accurate control of the strip 10. However, real-time detection will bring higher costs and a shorter time for tension deviation retesting, which is suitable for occasions with extremely high product requirements.

[0085] Exemplary, reference Figure 3The tension annealing device may further include: a cooling furnace 40 disposed on the transfer path of the strip 10 and located after the annealing furnace 30 , and a temperature detection device 42 for detecting the temperature of the strip 10 at the outlet of the cooling furnace 40 .

[0086] The above embodiment has the following beneficial effects: by providing a cooling furnace 40 and providing a temperature detection device 42 at the outlet of the cooling furnace 40, it is possible to ensure that the temperature of the strip 10 is cooled to a temperature below a certain temperature (for example, it is possible to ensure that the temperature of the strip 10 is cooled to a temperature below 200°C), thereby avoiding severe oxidation reactions that affect the performance of the strip 10.

[0087] After annealing, the brittleness of the strip 10 increases sharply due to the completion of the crystallization process. If there is a large tension in the cooling furnace 40, the strip 10 is very likely to break. Therefore, the tension on the strip 10 entering the cooling furnace 40 can be made as small as possible to avoid the strip 10 from breaking. For example, a longer cooling furnace 40 can be set along the conveying path of the strip 10 to ensure that the strip 10 is cooled to a certain temperature before being output from the cooling furnace 40.

[0088] Exemplary, reference Figure 3 Two third tension roller groups 41 may be provided in the cooling furnace 40, and the two third tension roller groups 41 are used to drive the strip 10 to be transmitted along the strip 10 transmission path in the cooling furnace 40. Exemplarily, the rotation speeds of the two third tension roller groups 41 may be the same, so that the tension on the strip 10 entering the cooling furnace 40 is as small as possible.

[0089] For example, the arrangement of the cross-sectional area detection device 20, the annealing furnace 30 and the cooling furnace 40 can be, but not limited to, a straight line, an S-shaped or other linear arrangement, which can be adjusted according to production needs. Figure 3 The tension annealing device includes a cross-sectional area detection device 20, an annealing furnace 30 and a cooling furnace 40 which are sequentially arranged along the transmission path of the strip 10. After the arrangement of the cross-sectional area detection device 20, the annealing furnace 30 and the cooling furnace 40 is determined, a certain number of tension roller groups, transmission rollers and other driving devices that drive the strip 10 to be transmitted along the transmission path can be added to the transmission path as needed.

[0090] Exemplary, reference Figure 3 The cross-sectional area detection device 20 can be directly connected to the annealing furnace 30, that is, the outlet of the cross-sectional area detection device 20 is connected to the inlet of the annealing furnace 30, so that after being transmitted from the outlet of the cross-sectional area detection device 20, it directly enters the annealing furnace 30 through the inlet of the annealing furnace 30.

[0091] In other embodiments, the cross-sectional area detection device 20 may not be directly connected to the annealing furnace 30, that is, the outlet of the cross-sectional area detection device 20 is spaced from the inlet of the annealing furnace 30, and after being transmitted from the outlet of the cross-sectional area detection device 20, it is transmitted for a certain distance and then enters the annealing furnace 30 through the inlet of the annealing furnace 30. In the above manner, the deviation caused by the large difference between the detection temperature of the cross-sectional area detection device 20 and the annealing temperature in the annealing furnace 30 to the temperature fluctuation of the strip 10 can be avoided. At this time, preferably, a furnace body can be added between the cross-sectional area detection device 20 and the annealing furnace 30 to ensure the density of nitrogen in the annealing furnace 30, and also to ensure that the strip 10 is always surrounded by the atmosphere gas.

[0092] Exemplarily, due to the production needs of the nanocrystalline ribbon 10, the annealing furnace 30 and the cooling furnace 40 may be filled with an atmospheric gas to protect the ribbon 10 and prevent oxidation of the ribbon 10. In a more preferred embodiment, the cross-sectional area detection device 20 may also be filled with an atmospheric gas to protect the ribbon 10. Exemplarily, the atmospheric gas may be a gas that is difficult to oxidize, such as, but not limited to, nitrogen, an inert gas, or the like.

[0093] The filling method of the atmosphere gas is specifically related to the arrangement of different furnace bodies. Figure 3 Each annealing furnace 30 is equipped with a separate atmosphere gas inlet 50, and gas sensors are provided at the inlet and outlet of the annealing furnace 30 to detect the density of the atmosphere gas, so as to ensure that the strip 10 in the annealing furnace 30 is completely protected by the atmosphere gas. Exemplarily, an atmosphere gas outlet can also be provided in the annealing furnace 30, so that the atmosphere gas in the annealing furnace 30 can flow dynamically, thereby ensuring the quality of the atmosphere gas in the annealing furnace 30.

[0094] Exemplarily, when the cross-sectional area detection device 20 is directly connected to the annealing furnace 30, an atmosphere gas input port 50 may be provided on the cross-sectional area detection device 20. Exemplarily, when the cooling furnace 40 is also directly connected to the annealing furnace 30, an atmosphere gas output port may be provided on the cooling furnace 40, and the annealing furnace 30 is completely sealed except for the strip 10 inlet and the strip 10 outlet, so as to ensure that the strip 10 in the annealing furnace 30 is always under the protection of the atmosphere gas.

[0095] The various embodiments shown above can achieve accurate control of the actual tension in different annealing furnaces 30 to be equal to the target tension at a relatively high annealing temperature. It can also eliminate the tension deviation caused by the change in the cross-sectional area such as the thickness and width of the strip 10, ensuring the consistency of the product. In addition, the tension annealing device shown above has a simple architecture, and all accessories are mature products on the market, which are easy to implement. Therefore, the manufacturing cost of the tension annealing device can be reduced, and the continuous production of the strip 10 can be achieved.

[0096] The present invention has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A tension annealing device for a strip, characterized in that: include: A cross-sectional area detection device and an annealing furnace are sequentially arranged on the strip transfer path; Wherein, the cross-sectional area detection device is used to detect the cross-sectional area information of the strip that will enter the annealing furnace; The annealing furnace includes a tension applying device, which applies a target tension to the strip entering the annealing furnace based on at least the cross-sectional area information.

2. The tension annealing device according to claim 1, characterized in that: The tension applying device comprises: two first tension roller groups located on the strip transfer path and spaced apart; Wherein, the cross-sectional area information includes: first cross-sectional area information of the strip that is about to enter between the two first tension roller groups; The tension applying device dynamically adjusts the rotation speed difference between the two first tension roller groups based at least on the first cross-sectional area information, so as to apply the target tension to the strip between the two first tension roller groups.

3. The tension annealing device according to claim 2, characterized in that: The annealing furnace also includes a first temperature control device for controlling the annealing temperature at a target annealing temperature; The tension applying device dynamically adjusts the rotation speed difference between the two first tension roller groups based at least on the first cross-sectional area information and the target annealing temperature to apply the target tension to the strip entering the annealing furnace.

4. The tension annealing device according to claim 3, characterized in that: The tension applying device dynamically adjusts the speed difference between the two first tension roller groups based on the first cross-sectional area information, the target annealing temperature, and the cross-sectional area-speed difference correspondence relationship to apply the target tension to the strip entering the annealing furnace; The cross-sectional area-rotation speed difference correspondence relationship is obtained by testing the annealing furnace based on the target annealing temperature and the target tension.

5. The tension annealing device according to claim 3, characterized in that: The number of the annealing furnaces is at least two; The target annealing temperatures are different between different annealing furnaces, and / or the target tensions are different between different annealing furnaces.

6. The tension annealing device according to any one of claims 2 to 5, characterized in that: The cross-sectional area detection device comprises: Two second tension roller groups are located on the strip transfer path and are spaced apart from each other, and the speed difference between the two second tension roller groups is maintained at a preset speed difference; and A tension detection device, used for detecting the tension change information of the strip between the two second tension roller groups; Wherein, the cross-sectional area information includes: the second cross-sectional area information of the strip between the two second tension roller groups; The cross-sectional area detection device determines the second cross-sectional area information based at least on the tension change information and the preset rotation speed difference, and calculates the first cross-sectional area information based on the second cross-sectional area information.

7. The tension annealing device according to claim 6, characterized in that: The distance between the two first tension roller sets is a first distance, and the distance between the two second tension roller sets is a second distance; Wherein, the first spacing is an integer multiple of the second spacing.

8. The tension annealing device according to claim 6, characterized in that: The cross-sectional area detection device further comprises a second temperature control device for controlling the detection temperature at a preset detection temperature, wherein the preset detection temperature is lower than a target annealing temperature of the annealing furnace; The cross-sectional area detection device determines the second cross-sectional area information based at least on the tension change information, the preset rotation speed difference and the preset detection temperature.

9. The tension annealing device according to claim 8, characterized in that: The cross-sectional area detection device determines the second cross-sectional area information based on the tension change information, the preset rotation speed difference, the preset detection temperature, and the cross-sectional area-tension correspondence relationship; The cross-sectional area-tension correspondence relationship is obtained by testing the cross-sectional area detection device based on the preset detection temperature and the preset rotation speed difference.

10. The tension annealing device according to claim 1, characterized in that: Also includes: A cooling furnace disposed on the strip transfer path and located after the annealing furnace; as well as A temperature detection device is used to detect the temperature of the strip at the outlet of the cooling furnace.

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