A warm roll device for a strip rolling mill with internal and external electromagnetic control and its operation method

Abstract

The present invention provides a plate and strip rolling mill warming roller device with internal and external electromagnetic joint control and an operating method thereof, belonging to the technical field of steel rolling equipment in the metallurgical industry; the device comprises a rolling roller equally divided into an operating side and a transmission side, the two sides are divided into a plurality of sections, each section is provided with an electromagnetic induction heating device group and a temperature equalizing ring, the outside of the rolling roller is provided with an external roller induction heater group corresponding to each section, and the inside and outside of the rolling roller are provided with a temperature measuring device; the present invention adopts an electromagnetic joint control mode of an internal roller induction heater group and an external roller induction heater group to improve the technical defects of the rolling roller in a single warming roller mode with weak temperature compensation effect, poor heating capacity and insufficient control means; under the joint drive of the internal and external induction heating devices, the roller temperature hit rate and the axial / circumferential temperature control capabilities are significantly improved, which can effectively reduce the temperature drop of the target rolled piece during the rolling process and control it to complete rolling within the suitable rolling temperature range.

Description

Technical Field

[0001] The present invention relates to the technical field of steel rolling equipment in the metallurgical industry, and in particular to a plate and strip rolling mill warm roller device with internal and external electromagnetic joint control and an operating method thereof. Background Art

[0002] Non-ferrous metal materials such as titanium-aluminum alloys, magnesium-aluminum alloys, and high-precision copper foil are easily affected by the temperature sensitivity of their material properties and are difficult to form. The temperature sensitivity of their material properties is often manifested as brittle fracture in certain temperature ranges, while the ductility is good in the remaining temperature ranges. Therefore, when processing such materials, it is necessary to pay special attention to the rolling temperature, and controlling the rolling temperature is the key to achieving their good ductility. In this context, near-isothermal rolling with a small temperature drop of the rolled piece is an ideal rolling method for processing such metal materials. The so-called near-isothermal rolling is to adjust the roller temperature of the working rolls of the plate and strip mill so that the temperature of the upper and lower working rolls is controlled at a higher level, reducing the heat exchange between the rollers and the temperature drop of the rolled piece during the rolling process, so as to keep the rolling temperature of the slab as close as possible to the suitable rolling temperature range of the corresponding metal material.

[0003] Currently, there are many methods for increasing the temperature of the rolls to establish near-isothermal rolling conditions. These methods can be categorized by their temperature-rise principles into flame temperature rise, fluid temperature rise, electronic temperature rise, and electromagnetic temperature rise. Flame temperature rise involves heating the roll surface with an external flame device. While this method directly increases the temperature, it is highly polluting and has low heating efficiency. Fluid temperature rise involves injecting a high-temperature hot fluid into or onto the roll surface to increase the roll temperature. This also suffers from low temperature-rise efficiency, and internal injection of the fluid requires openings, which reduces roll stiffness. Electronic temperature rise involves placing electronic components inside the roll, using the heat generated by these components to increase the roll temperature. However, since the heat source is located internally, it is far from the surface and has low heating efficiency. Electromagnetic temperature rise involves heating the roll using internal or external electromagnetic induction devices. The electromagnetic heating method employed by electromagnetic temperature rise is both non-contact and more environmentally friendly. If the electromagnetic induction device is placed externally on the roll, it can form a high-temperature skin layer on the roll surface, efficiently heating the roll surface. If the electromagnetic induction device is placed internally on the roll, the roll must adopt a modular structure. To achieve efficient heating, the electromagnetic induction device must be close to the inner wall of the roll sleeve, and the roll wall thickness must be small, so that the high-temperature skin layer on the inner wall can quickly transfer heat to the roll surface. However, despite these differences, the two electromagnetic induction device placement methods for electromagnetic temperature rise have different drawbacks. Existing electromagnetic temperature rise devices for rolls located externally are affected by the difficulty in controlling the spatial magnetic field, resulting in poor axial temperature uniformity and failing to meet the axial temperature difference requirements of such rolling mills. Existing electromagnetic temperature rise devices located internally on the roll are affected by the thin wall and internal structure of the roll, reducing roll stiffness and the maximum force capacity that the roll can bear. Therefore, there is an urgent need to develop a temperature rise device and method for plate and strip mill rolls that effectively controls the axial temperature difference and maintains high roll stiffness, thereby ensuring the processing of non-ferrous metal materials such as titanium-aluminum alloys, magnesium-aluminum alloys, and high-precision copper foil. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a plate and strip rolling mill warming roller device with internal and external electromagnetic joint control and its operation method to solve the technical problem in the prior art that the electromagnetic temperature rising device inside the roller has poor axial temperature distribution uniformity, resulting in low roller stiffness and load-bearing capacity.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A plate and strip rolling mill warming device with internal and external electromagnetic linkage control, comprising a roll core, the roll core being evenly divided into an operating side and a transmission side, the operating side and the transmission side being respectively provided with a heating device group, the operating side and the transmission side being each divided into at least two sections, each section of the operating side and each section of the transmission side being provided with a heating device group, and each heating device group being correspondingly sleeved with a temperature averaging ring;

[0007] The number and position of the induction heater groups outside the rollers correspond to the number and position of the heating device groups provided on the roller cores;

[0008] The heating device group includes induction heating blocks arranged at equal intervals. The heating device group and the roller outer induction heater group are controlled by electromagnetic induction. Temperature measuring devices are provided inside and outside the roller.

[0009] Preferably, the roller core has a stepped symmetrical structure on both sides with the central axis as the symmetry axis, each step on the operating side corresponds to each of the areas divided on the operating side, and each step on the transmission side corresponds to each of the areas divided on the transmission side; the temperature equalizing ring outer shell is provided with a roller sleeve.

[0010] Preferably, the stepped structure arrangement on both sides of the center axis of the roller core includes:

[0011] Five steps are arranged from the end of the roller core to the middle of the roller core. The outermost step on the operating side and the transmission side is the first step, and the first step is used to carry the roller bearing; the second to fifth steps are arranged in sequence from the first step to the middle of the roller core on the operating side and the transmission side.

[0012] Preferably, the operating side and the transmission side are divided into the same areas, both including: Zone II, Zone III and Zone IV; the second to fourth steps of the operating side correspond to Zone IV to Zone II of the operating side respectively; the second to fourth steps of the transmission side correspond to Zone IV to Zone II of the transmission side respectively; the fifth steps of the operating side and the transmission side are flush and coplanar and correspond to the center Zone I of the middle part of the roller core.

[0013] Preferably, a heating device group is provided on the steps corresponding to each area of the operating side and the transmission side, and the layout of the heating device groups in mutually symmetrical areas is also symmetrical to each other; the central area I is provided with an electromagnetic induction heating device in area I.

[0014] Preferably, on the operating side, the diameters of the steps from the first step to the fifth step become larger in sequence;

[0015] On the transmission side, the step diameters from the first step to the fifth step increase sequentially.

[0016] Preferably, the outer roller induction heater group is arranged outside the roll core and is divided into an operating side and a transmission side which are the same as the roll core, and the operating side and the transmission side of the outer roller induction heater group correspond to the operating side and the transmission side of the roll core respectively in length position;

[0017] The operating side of the roller outer induction heater group is divided into zone II, zone III and zone IV which are the same as the operating side of the roll core, and the zones II, III and IV on the operating side of the roller outer induction heater group correspond one to one with the zones II, III and IV on the operating side of the roll core;

[0018] The transmission side of the roller outer induction heater group is divided into zone II, zone III and zone IV which are the same as the transmission side of the roll core, and the zones II, III and IV on the transmission side of the roller outer induction heater group correspond one to one with the zones II, III and IV on the transmission side of the roll core;

[0019] The middle portion of the roller outer induction heater group is divided into a center zone I which is the same as the middle portion of the roller core, and the center zone I of the roller outer induction heater group corresponds in position and length to the center zone I of the roller core;

[0020] Each divided area of the roller outer induction heater group is independently powered; the axial length of each partition of the roller outer induction heater group is equal to the axial length of the heating device group of each partition of the corresponding roller core.

[0021] A method for operating a warm roller device for a plate and strip rolling mill with internal and external electromagnetic joint control, the method utilizing the warm roller device for a plate and strip rolling mill with internal and external electromagnetic joint control, characterized in that the method comprises the following steps:

[0022] S1. Preset warm roller process parameters;

[0023] S2. Calculating the power distribution of the electromagnetic joint control inside and outside the roller according to the weight ratio coefficient;

[0024] S3, switching the warm roller device to the internal and external electromagnetic joint control mode to realize the internal electromagnetic induction heating control of the warm roller device;

[0025] S4, regulating the warm roller; comparing the actual temperature outside the roller with the preset temperature Tt to realize the external electromagnetic induction heating control of the warm roller device;

[0026] S5. Coordinate and control the circumferential temperature uniformity of the roll according to the temperature values of each section of the roll surface;

[0027] S6. Coordinate and control the axial temperature uniformity of the roll according to the temperature values of each section of the roll surface;

[0028] S7, check the stability of the warm roller;

[0029] S8. Execute rolling based on the constructed warm roll temperature field.

[0030] Preferably, the preset process parameters of the warm roller in S1 include:

[0031] S101, according to the upper limit temperature T of the heating of the roller material max Calculate the target setting value of roller temperature T according to the suitable rolling temperature range [T1, T2] of the rolled material t , where T1 is the minimum temperature suitable for rolling of the rolled material, T2 is the maximum temperature suitable for rolling of the rolled material, and the target setting value of the roll temperature T t The calculation formula is formula (1):

[0032]

[0033] S102, according to the roller temperature target setting value T t , calculate the overall roller temperature deviation ΔT h , roller axial temperature deviation ΔT a And the roller circumferential temperature deviation ΔT r , the overall roller temperature deviation ΔT h , the roller axial temperature deviation value ΔT a And the roller circumferential temperature deviation value ΔT r The calculation formula is formula (2):

[0034]

[0035] S103, according to the roller temperature target setting value T t And the overall roller temperature deviation ΔT h , set the weight ratio coefficient of the roller inner heating device group and the roller outer induction heater group to k n With k y , and k n >k y According to the roller axial temperature deviation value ΔT a And the roller circumferential temperature deviation value ΔT r , set the rotation speed v of the warm roller;

[0036] The internal and external electromagnetic joint control power distribution of S2 includes:

[0037] S201, according to the weight ratio coefficient k in S103 n With k y , the roller warming power P roll Divided into internal temperature rise power p n and external temperature rise power P y , the internal temperature rise power p n The calculation formula is formula (5), the external temperature rise power p y The calculation formula is formula (6):

[0038]

[0039] k1+k2=1 (4)

[0040] Among them, k1 and k2 are efficiency coefficients;

[0041] The endogenous electromagnetic induction heating control of the warm roller device in S3 includes:

[0042] S301. Determine formula (5) based on formula (3) and formula (4):

[0043] P n =k1P roll (5)

[0044] The average coil power of the induction heating device group inside the roller is calculated. The average coil power of the IV, III and II zones on the operating side of the roller core and the IV, III and II zones on the transmission side of the roller core are all 0.125p n The average coil power of the center I zone of the roller core is 0.25p n ;

[0045] S302: Prioritize driving the induction heating device group inside the roller to control the temperature field inside the roller, that is, prioritize the internal electromagnetic control mode until the roller surface temperature reaches 60% T t Then, the roller outer induction heater group is turned on, thereby switching to the internal and external electromagnetic joint control mode;

[0046] The external electromagnetic induction heating control of the warm roller device in S4 includes:

[0047] S401, formula (6) is obtained based on formula (3) and formula (4):

[0048] P y =k2P roll (6)

[0049] The average coil power of the roller outer induction heater group is calculated. The average coil power of the IV zone, III zone and II zone on the operating side of the roller outer induction heater group and the IV zone, III zone and II zone on the transmission side of the roller outer induction heater group are all 0.125p y The average coil power of the center zone I of the roller outer induction heater group is 0.25p y ;

[0050] S402: After the system enters the internal and external electromagnetic joint control mode, the roller outer induction heater group and the spindle motor of the working roller are driven to adjust the roller warming according to the preset value of the roller warming roller rotation speed v; at the same time, the temperature average value of the roller outer temperature detection point is calculated based on the detection value of the temperature of each section detection point outside the roller by the external temperature measuring device. and the roller temperature target setting value T t Make a comparison;

[0051] If the roller temperature stabilizes, At this time, the warm roller has a good effect;

[0052] If the roller temperature stabilizes, This indicates that the temperature of the warm roller has not reached the preset temperature and needs to be increased. roll to 105% of the original parameter, and repeat step S2 until it reaches

[0053] Preferably, the coordinated control of the circumferential temperature uniformity of the rollers in S5 includes:

[0054] S501, based on the temperature detection value of each section of the roller surface by the external temperature measuring device, calculate the actual temperature difference of the circumferential temperature of each section of the roller, and compare the circumferential temperature deviation value ΔT of the roller r The roll can be divided into multiple axial sections according to the operating side or transmission side, namely, Zone IV, Zone III, Zone II, and the center Zone I; each section is equipped with a roll surface temperature detection device to detect the temperature of each section in real time;

[0055] S502, as the warm roller progresses, within a single warm roller cycle, [t, t+2πr / v], t is the minimum time within a single warm roller cycle, t+2πr / v is the maximum time within a single warm roller cycle, wherein r is the cross-sectional radius of the roll, and v is the rotation speed of the roll;

[0056] The roller surface temperature detection device samples and calculates the temperature extreme difference ΔT in the section in real time r-real The value is used as the actual circumferential temperature difference of the section and the circumferential temperature deviation value of the roller ΔT r contrast;

[0057] If ΔT r-real <ΔT r , then the circumferential temperature difference in this section is small and the circumferential temperature uniformity is good;

[0058] If ΔT r-real >ΔT r , then there is a circumferential temperature non-uniformity problem in this section, and the temperature of the roller outer induction heater group in this section should be increased;

[0059] S503: If there are three or more sections with circumferential temperature non-uniformity, it indicates that the roll speed of the warm roll process does not meet the circumferential temperature uniformity requirement, and the warm roll rotation speed v is increased by 5% of the original parameter;

[0060] The S6 roll axial temperature uniformity coordinated control includes:

[0061] S601, calculate the actual axial temperature difference between the sections of the roller according to the temperature detection value of each section of the roller surface by the external temperature measuring device of the roller, and compare the axial temperature deviation value ΔT of the roller a ; Among them, the actual axial temperature difference between each section is the extreme difference value ΔT of the temperature set of each section a-real ;

[0062] S602: As the warm roller progresses, when step S402 shows that the warm roller is in good condition, real-time sampling and calculation of ΔT a-real , and make the following comparison:

[0063] If ΔT a-real <ΔT a , then the axial temperature difference in this section is small and the axial temperature uniformity is good;

[0064] If ΔT a-real >ΔT a , then there is a temperature non-uniformity problem in the axial direction of this section, and the current power in the area with large temperature difference should be increased;

[0065] The S7 test for the stability of the warm roller includes:

[0066] After the roller temperature and axial temperature difference and circumferential temperature difference meet the preset values, continue to test for 3 minutes. If ΔT h , ΔT a and ΔT r If there is no temperature fluctuation of more than 5℃, it is judged that the stability of the warm roller is good at this time; if ΔT h , ΔT a and ΔT r If temperature fluctuations exceed 5°C, the internal and external electromagnetic joint control heating devices must be switched to PID mode for continuous control.

[0067] Compared with the prior art, the present invention has at least the following beneficial effects:

[0068] This solution utilizes electromagnetic induction heating devices that are jointly controlled inside and outside the rolls. The internal device achieves internal temperature rise, effectively avoiding the problems of low heat penetration and high heat dissipation from the roll surface caused by external heating. The external device acts as a supplementary device, moderately absorbing some of the roll temperature rise and promoting uniform roll surface temperature. Driven by the combined internal and external induction heating devices, the roll temperature hit rate and axial and circumferential temperature control capabilities are significantly improved.

[0069] The present invention utilizes electromagnetic induction heating devices arranged in multiple sections within the roller and induction heaters arranged in multiple sections outside the roller, leveraging the combined control of these internal and external heating devices to achieve multi-segment axial roller temperature control. The multi-segmented electromagnetic induction heating devices employed in this invention are densely packed axially to fill axial voids and enhance the roller's axial stiffness. Furthermore, in terms of radial cross-section, the device's fan-shaped heating block structure, combined with its small-angle, evenly spaced layout, meets the requirements for circumferential temperature uniformity for this type of roller while minimizing variations in circumferential stiffness. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable one skilled in the relevant art to make and use the present disclosure.

[0071] Figure 1 A half-section structural diagram of a warm roller device for a plate and strip rolling mill with internal and external electromagnetic joint control according to an embodiment of the present invention;

[0072] Figure 2 A half-section structural diagram of a roll core of a warm roll device for a plate and strip rolling mill with internal and external electromagnetic joint control according to an embodiment of the present invention;

[0073] Figure 3 This is a cross-sectional view of zone I of a warm roll device for a plate and strip rolling mill with internal and external electromagnetic joint control according to an embodiment of the present invention;

[0074] Figure 4 This is a cross-sectional view of zone II of a warm roll device for a plate and strip rolling mill with internal and external electromagnetic joint control according to an embodiment of the present invention;

[0075] Figure 5 This is a cross-sectional view of zone III of a warm roll device for a plate and strip rolling mill with internal and external electromagnetic joint control according to an embodiment of the present invention;

[0076] Figure 6 This is a cross-sectional view of zone IV of a warm roll device for a plate and strip rolling mill with internal and external electromagnetic joint control according to an embodiment of the present invention;

[0077] Figure 7 This is a schematic diagram of internal and external electromagnetically controlled heating of a warm roll device of a strip rolling mill according to an embodiment of the present invention;

[0078] Figure 8 This is an overall structural diagram of a plate and strip mill warming roller device with internal and external electromagnetic joint control according to an embodiment of the present invention;

[0079] Figure 9 This is a three-dimensional half-section diagram of a plate and strip rolling mill warm roller device with internal and external electromagnetic joint control according to an embodiment of the present invention.

[0080] [reference numerals]

[0081] 1. Temperature-averaging copper ring in zone IV on the operating side; 2. Temperature-averaging copper ring in zone III on the operating side; 3. Temperature-averaging copper ring in zone II on the operating side; 4. Electromagnetic roller core controlled by internal and external electromagnetics; 5. Electromagnetic induction heating device group in zone IV on the operating side; 6. Electromagnetic induction heating device group in zone III on the operating side; 7. Electromagnetic induction heating device group in zone II on the operating side; 8. Roller sleeve; 9. Temperature-averaging copper ring in zone IV on the transmission side; 10. Temperature-averaging copper ring in zone III on the transmission side; 11. Temperature-averaging copper ring in zone II on the transmission side; 12. Temperature-averaging copper ring in zone I on the center; 13. Electromagnetic induction heating device group in zone IV on the transmission side; 14. Electromagnetic induction heating device group in zone III on the transmission side Magnetic induction heating device group; 15. Electromagnetic induction heating device group in zone II on the transmission side; 16. Electromagnetic induction heating device group in zone I on the center; 17. Roller outer induction heater group; 17-1. Roller outer induction heater group in zone IV on the operating side; 17-2. Roller outer induction heater group in zone III on the operating side; 17-3. Roller outer induction heater group in zone II on the operating side; 17-4. Roller outer induction heater group in zone I on the center; 17-5. Roller outer induction heater group in zone II on the transmission side; 17-6. Roller outer induction heater group in zone III on the transmission side; 17-7. Roller outer induction heater group in zone IV on the transmission side.

[0082] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the appended claims. DETAILED DESCRIPTION

[0083] The following describes in detail, with reference to the accompanying drawings and specific embodiments, a plate and strip mill warming roller device with internal and external electromagnetic linkage control and its operating method, provided by the present invention. It is also noted that, to provide a more detailed description, the following embodiments are best and preferred embodiments, and those skilled in the art may employ alternative implementations for known technologies. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0084] It should be noted that references in the specification to "one embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes such specific features, structures, or characteristics. In addition, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

[0085] In general, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending at least in part on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0086] It will be understood that the meanings of “on,” “over,” and “above” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes being “on” something with intervening features or layers, and “on” or “over” means not only “on” or “above” something, but also includes being “on” or “above” something with no intervening features or layers.

[0087] Additionally, spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as illustrated in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein should be similarly interpreted accordingly.

[0088] like Figures 1-9 As shown, the present application provides a plate and strip mill warm roller device with internal and external electromagnetic joint control and an operating method thereof.

[0089] like Figures 1-9 As shown, the roll core 4 includes a solid roll. The roll core 4 is divided into an operating side and a transmission side with the central axis as the axis of symmetry. The central axis is parallel to the end faces of the roll core 4. The operating side and the transmission side are symmetrically divided into multiple regions. In the embodiment of the present application, the operating side and the transmission side are preferably divided into four regions. The operating side is divided into operating side region IV, operating side region III, and operating side region II. The transmission side is divided into transmission side region IV, transmission side region III, and transmission side region II. The two adjacent regions of the operating side and the transmission side together constitute the central region I. The regions IV of the operating side and the transmission side are symmetrical to each other, the regions III of the operating side and the transmission side are symmetrical to each other, and the regions II of the operating side and the transmission side are symmetrical to each other.

[0090] like Figures 1-6As shown, the roll core 4 has a stepped, symmetrical structure with its central axis as the axis of symmetry. The stepped structure, centered around the central axis of the roll core 4, features gradient roller segments of equal length arranged symmetrically on both sides. In this embodiment of the present application, the stepped structures on both the operating and transmission sides preferably have five steps, i.e., five steps from the end of the roll core 4 to the central axis of the roll core 4. The outermost end of the operating and transmission sides, i.e., the end of the roll core 4, forms the first step, serving as the roll neck for mounting the roll bearing. Steps two to five are sequentially provided on the operating and transmission sides from their respective first steps to the central axis of the roll core 4.

[0091] The second to fourth steps on the operating side correspond to operating side Zones IV, III, and II, respectively; the second to fourth steps on the transmission side correspond to drive side Zones IV, III, and II, respectively. The fifth steps on the operating and transmission sides are flush and coplanar, corresponding to Zone I in the center of the roll core 4. Each step is equipped with a heating device group: the second to fourth steps on the operating side are equipped with electromagnetic induction heating device group 5 for Zone IV, electromagnetic induction heating device group 6 for Zone III, and electromagnetic induction heating device group 7 for Zone II; the second to fourth steps on the transmission side are equipped with electromagnetic induction heating device group 13 for Zone IV, electromagnetic induction heating device group 14 for Zone III, and electromagnetic induction heating device group 15 for Zone II.

[0092] The electromagnetic induction heating device groups corresponding to the steps in the symmetrical areas are also arranged and installed symmetrically, that is, the operating side electromagnetic induction heating device group and the transmission side electromagnetic induction heating device group are symmetrically arranged on the operating side and transmission side of the roller core 4.

[0093] The symmetrical relationship of the electromagnetic induction heating device groups is as follows: the electromagnetic induction heating device group 5 in zone IV on the operating side and the electromagnetic induction heating device group 13 in zone IV on the transmission side are symmetrically arranged and are respectively installed on the second step structures on the operating side and the transmission side, serving as the end roller temperature control group of the device of this embodiment; the electromagnetic induction heating device group 6 in zone III on the operating side and the electromagnetic induction heating device group 14 in zone III on the transmission side are symmetrically arranged and are respectively installed on the third step structures on the operating side and the transmission side, serving as the secondary end roller temperature control group of the device of this embodiment; the electromagnetic induction heating device group 7 in zone II on the operating side and the electromagnetic induction heating device group 15 in zone II on the transmission side are symmetrically arranged and are respectively installed on the fourth step structures on the operating side and the transmission side, serving as the secondary middle roller temperature control group of the device of the present invention; the electromagnetic induction heating device group 16 in zone I on the center is independently installed in the middle of the device of this embodiment, on the fifth step structure corresponding to zone I in the center of the roller core 4, for middle roller temperature control.

[0094] Each step corresponding to the heating device group is equipped with a corresponding temperature-averaging ring. In the embodiment of the present application, copper rings are preferably used. That is, the present application includes an operating side IV zone temperature-averaging copper ring 1, an operating side III zone temperature-averaging copper ring 2, an operating side II zone temperature-averaging copper ring 3, a transmission side IV zone temperature-averaging copper ring 9, a transmission side III zone temperature-averaging copper ring 10, a transmission side II zone temperature-averaging copper ring 11, and a center I zone temperature-averaging copper ring 12. An integral roller sleeve 8 is provided on the outside of all the temperature-averaging rings.

[0095] The symmetrical step diameters of the operating side and the transmission side are the same. The first step diameter of the operating side and the transmission side is D1, the second step diameter of the operating side and the transmission side is D2, the third step diameter of the operating side and the transmission side is D3, the fourth step diameter of the operating side and the transmission side is D4, and the fifth step diameter of the operating side and the transmission side is D5. The diameters of the first to fifth steps of the operating side and the transmission side increase in sequence, that is, D1 <D2<D3<D4<D5。

[0096] like Figure 7 As shown, an electromagnetic induction-controlled outer roller induction heater group 17 is correspondingly provided on the outside of the roller core 4. The outer roller induction heater group 17 is also divided into an operating side and a transmission side that are the same as the operating side and the transmission side of the roller core 4 with the central axis as the axis of symmetry. The operating side and the transmission side of the outer roller induction heater group 17 correspond to the operating side and the transmission side of the roller core 4 in length position respectively.

[0097] The operating side of the outer roller induction heater group 17 is divided into zone II, zone III and zone IV which are the same as the operating side of the roll core 4, and zone II, zone III and zone IV of the operating side of the roll core 4 correspond one-to-one to zone II, zone III and zone IV of the operating side of the roll core 4; the transmission side of the outer roller induction heater group 17 is divided into zone II, zone III and zone IV which are the same as the transmission side of the roll core 4, and zone II, zone III and zone IV of the transmission side of the roll core 4 correspond one-to-one to zone II, zone III and zone IV of the transmission side of the roll core 4; that is, zone II, zone III and zone IV on both sides of the outer roller induction heater group 17 are symmetrical to each other, and the middle part of the outer roller induction heater group 17 is divided into a center zone I which is the same as the middle part of the roll core 4, and the center zone I of the outer roller induction heater group 17 corresponds in position and length to the center zone I of the roll core 4.

[0098] The roller external induction heater groups 17 are divided into an operating side zone IV roller external induction heater group 17-1, an operating side zone III roller external induction heater group 17-2, an operating side zone II roller external induction heater group 17-3, a center zone I roller external induction heater group 17-4, a drive side zone II roller external induction heater group 17-5, a drive side zone III roller external induction heater group 17-6, and a drive side zone IV roller external induction heater group 17-7. Each zone of the roller external induction heater group 17 corresponds in number and position to the corresponding heating device group within the zone of the roll core 4.

[0099] The axial length of the roller external induction heater group 17-1 in zone IV on the operating side and the roller external induction heater group 17-7 in zone IV on the transmission side is equal to the axial length of the electromagnetic induction heating device group 5 in zone IV on the operating side and the electromagnetic induction heating device group 13 in zone IV on the transmission side; the axial length of the roller external induction heater group 17-2 in zone III on the operating side and the roller external induction heater group 17-6 in zone III on the transmission side is equal to the axial length of the electromagnetic induction heating device group 6 in zone III on the operating side and the electromagnetic induction heating device group 14 in zone III on the transmission side; the axial length of the roller external induction heater group 17-3 in zone II on the operating side and the roller external induction heater group 17-5 in zone II on the transmission side is equal to the axial length of the electromagnetic induction heating device group 7 in zone II on the operating side and the electromagnetic induction heating device group 15 in zone II on the transmission side; the axial length of the roller external induction heater group 17-4 in zone I on the center is equal to the axial length of the electromagnetic induction heating device group 16 in zone I on the center.

[0100] The external roller induction heater assembly 17 is an arc-shaped heater, with the arc preferably corresponding to an angle of 60°. Each section of the external roller induction heater assembly 17 is independently powered by multiple power supplies, enabling independent control of multiple sections. Each section of the external roller induction heater assembly 17 is separated by 3 mm to prevent magnetic field confluence between coils, which could cause short circuits. The external roller induction heater assembly 17 is fixed to the rolling mill arch, providing an induction heat source for the rotating rollers. Temperature measuring devices are installed on and outside the roller core 4.

[0101] The electromagnetic induction heating device group of the embodiment of the present application is a multi-component combination structure, and each electromagnetic induction heating device group includes a plurality of (preferably 6 in the embodiment of the present application) fan-shaped electromagnetic induction heating blocks and matching induction coils arranged at the same angle and equal intervals; between different electromagnetic induction device groups, the fan-shaped electromagnetic induction heating blocks only have different inner diameters, while the outer diameters are all equal to the inner diameters of each temperature-averaging copper ring. In order to achieve uniform circumferential temperature rise in each section, a temperature-averaging copper ring is provided on the outside of the electromagnetic induction heating block. In addition to achieving uniform circumferential heat transfer of the roller, the temperature-averaging copper ring can also play the role of assembly constraint and spatial positioning between the electromagnetic induction heating blocks of each group and the roller core 4.

[0102] The fan-shaped electromagnetic induction heating block is wound with a spiral coil, with a spacing of greater than 1mm between the coil and the fan-shaped electromagnetic induction heating block to prevent contact between the coil and the heating block due to vibration of the alternating current. The coil is wound in a rigid hollow copper tube, which allows cooling water to flow through it to cool the coil. The spacing between the coil and the fan-shaped electromagnetic induction heating block is less than 3mm to prevent the loss of magnetothermal efficiency caused by the electromagnetic induction proximity effect.

[0103] like Figures 1-9As shown, the embodiment of the present application provides an operating method for a plate and strip mill warming roller device with internal and external electromagnetic joint control. The method utilizes the plate and strip mill warming roller device with internal and external electromagnetic joint control, and the specific operating steps include:

[0104] S1: preset warm roller process parameters;

[0105] S101, according to the upper limit temperature T of the heating of the roller material max Calculate the target setting value of roller temperature T according to the suitable rolling temperature range [T1, T2] of the rolled material t , where T1 is the minimum temperature suitable for rolling of the rolled material, T2 is the maximum temperature suitable for rolling of the rolled material, and the target setting value of the roll temperature T t The calculation formula is formula (1):

[0106]

[0107] S102, according to the roller temperature target setting value T t , calculate the overall roller temperature deviation ΔT h , roller axial temperature deviation ΔT a And the roller circumferential temperature deviation ΔT r , the overall deviation of roller temperature ΔT h , roller axial temperature deviation ΔT a And the roller circumferential temperature deviation ΔT r The calculation formula is formula (2):

[0108]

[0109] S103, according to the roller temperature target setting value T t And the overall deviation of roller temperature ΔT h , set the weight ratio coefficient k of the electromagnetic induction heating device group inside the roller and the induction heater group outside the roller 17 n With k y , and k n >k y ; According to the roller axial temperature deviation value ΔT a And the roller circumferential temperature deviation ΔT r , set the rotation speed v of the warm roller.

[0110] S2: Calculate the power distribution of the electromagnetic joint control inside and outside the roller according to the weight ratio coefficient;

[0111] S201, according to the weight ratio coefficient k in S103 n With k y , the roller warming power P roll Divided into internal temperature rise power p n and external temperature rise power p y, internal temperature rise power p n The calculation formula is formula (5), the external temperature rise power p y The calculation formula is formula (6):

[0112]

[0113] Wherein, k1 and k2 are efficiency coefficients, which can be determined by those skilled in the art based on experience.

[0114] S3: Realize the internal electromagnetic induction heating control of the warm roller device;

[0115] S301: Formula (5) is obtained based on formula (3) and formula (4) in S201:

[0116] P n =k1P roll (5)

[0117] Calculate the average coil power of the induction heating device group inside the roller; the average coil power of the roller core 4 operating side IV, III and II area and the roller core 4 transmission side IV, III and II area is 0.125p n , and the average coil power of the center I zone of the roller core 4 is 0.25p n (Center I zone includes the transmission side and the operating side areas);

[0118] S302: Prioritize driving the induction heating device group inside the roller to control the temperature field inside the roller, that is, prioritize the internal electromagnetic control mode until the roller surface temperature reaches 60% T t After that, the roller outer induction heater group 17 is turned on, thereby switching to the internal and external electromagnetic joint control mode.

[0119] S4: realize external electromagnetic induction heating control of the warm roller device;

[0120] S401: Formula (6) is obtained based on formula (3) and formula (4) in S201:

[0121] P y =k2P roll (6)

[0122] Calculate the average coil power of the roller outer induction heater group 17, where the average coil power of the roller outer induction heater group 17 operating side zone IV, zone III and zone II and the roller outer induction heater group 17 driving side zone IV, zone III and zone II are 0.125p y , while the average coil power of the center I zone of the roller induction heater group 17 is 0.25p y (Center I zone includes the transmission side and the operating side areas);

[0123] S402: After the system enters the internal and external electromagnetic joint control mode, the roller outer induction heater group 17 and the spindle motor of the working roller are driven to adjust the roller warming according to the preset value of the roller warming roller rotation speed v; at the same time, based on the detection values of the temperature of each section detection point outside the roller by the external temperature measuring device, the temperature average value of the roller outer temperature detection point is calculated. and the roller temperature target setting value T t Make a comparison;

[0124] If the roll temperature stabilizes At this time, the warm roller has a good effect;

[0125] If the roll temperature stabilizes This indicates that the temperature of the warm roller has not reached the preset temperature and needs to be increased. roll To 105% of the original parameter, and repeat S2 until it reaches

[0126] S5: Coordinated control of the circumferential temperature uniformity of the rolls;

[0127] S501: Calculate the actual circumferential temperature difference of each section of the roll according to the temperature measurement value of each section of the roll surface by the temperature measuring device installed outside the roll, and compare the circumferential temperature deviation value ΔT of the roll r Among them, the roller can be divided into multiple axial sections according to the IV zone, III zone, II zone and the center I zone on the operating side or the transmission side; each section in the roller is equipped with a roller surface temperature detection device, which can detect the temperature conditions of each section in real time.

[0128] S502: As the warm roller progresses, within a single warm roller cycle [t, t+2πr / v], where t is the minimum time within a single warm roller cycle, t+2πr / v is the maximum time within a single warm roller cycle, r is the cross-sectional radius of the roll, and v is the rotation speed of the roll warm roller; the roll surface temperature detection device samples in real time and calculates the temperature extreme difference value ΔT within the section r-real The value is used as the actual circumferential temperature difference of the section and compared with the circumferential temperature deviation of the roller;

[0129] If ΔT r-real <ΔT r , it is judged that the circumferential temperature difference in this section is small and the circumferential temperature uniformity is good;

[0130] If ΔT r-real >ΔT r , then there is a circumferential temperature non-uniformity problem in this section, and the temperature of the roller outer induction heater group 17 in this section needs to be increased;

[0131] S503: If there are three or more sections with temperature non-uniformity, it indicates that the roll speed of the warm roll process does not meet the circumferential temperature uniformity requirement, and the warm roll rotation speed v needs to be increased by 5% of the original parameter.

[0132] S6: Coordinate and control the axial temperature uniformity of the roll;

[0133] S601: Calculate the actual axial temperature difference between the sections of the roll according to the temperature detection value of each section of the roll surface by the external temperature measuring device of the roll, and compare the axial temperature deviation value ΔT of the roll a ; Among them, the actual axial temperature difference between each section is the extreme difference value ΔT of the temperature set of each section a-real ;

[0134] S602: As the warm roller progresses, when step S402 shows that the warm roller is in good condition, real-time sampling and calculation of ΔT a-real , and make the following comparison:

[0135] If ΔT a-real <ΔT a , it is judged that the axial temperature difference in this section is small and the axial temperature uniformity is good;

[0136] If ΔT a-real >ΔT a , then there is a temperature non-uniformity problem in the axial direction of this section, and the current power in the area with large temperature difference needs to be increased.

[0137] S7: Check the stability of the warm roller;

[0138] After the roller temperature and axial temperature difference and circumferential temperature difference meet the preset values, continue to test for 3 minutes. If ΔT h , ΔT a and ΔT r If there is no temperature fluctuation of more than 5℃, it is judged that the stability of the warm roller is good at this time; if ΔT h , ΔT a and ΔT r If temperature fluctuations exceed 5°C, the internal and external electromagnetic joint control heating devices must be switched to PID mode for continuous control.

[0139] S8: Based on the constructed warm roll temperature field, rolling is performed.

[0140] Example 1

[0141] In this embodiment, the diameters of the first to fifth steps are D1 = 270 mm, D2 = 300 mm, D3 = 340 mm, D4 = 380 mm and D5 = 400 mm, respectively.

[0142] The upper limit temperature T of the heating of the roll material in S101 max=350℃, the suitable rolling temperature range of the rolled material is [1100℃, 1250℃], calculate the target setting value of the roller temperature T t =280℃.

[0143] Calculate the overall roller temperature deviation ΔT in S102 h =28℃, roller axial temperature deviation ΔT a =14℃ and the roller circumferential temperature deviation ΔT r =8.4℃.

[0144] In S103, the weight ratio coefficient k of the roller inner induction heating device group and the roller outer induction heater group 17 is set. n =0.7 and k y =0.3, set the rolling roller warm roller rotation speed v=8m / s.

[0145] In S2, the roll warming power P is adjusted according to the two weight ratio coefficients. roll =1.62kW is divided into internal temperature rise power p n =1.134kW and external temperature rise power p y =0.486kW.

[0146] In S301, the average coil power of zones IV, III, and II on the operating side and zones IV, III, and II on the transmission side is 0.142 kW, while the average coil power of the center zone I is 0.284 kW.

[0147] In S302, the internal induction heating device group of the roller is driven first to control the temperature field inside the roller, that is, the internal electromagnetic control mode is adopted first; after the roller surface temperature reaches 168°C, the external induction heater group 17 of the roller is turned on, thereby switching to the internal and external electromagnetic joint control mode.

[0148] In S4, the average coil power of zones IV, III, and II on the operating side and zones IV, III, and II on the transmission side is 0.061kW, while the average coil power of zone I in the center is 0.122kW;

[0149] Calculate the average temperature of the roller outer temperature detection point And with the preset temperature T t By comparison, the results show that |257℃-280℃|≤23℃, at this time the warm roller has a good effect.

[0150] In S5, as the temperature roller progresses, the roller surface temperature detection device samples and calculates the temperature extreme difference ΔT in the section in real time. r-real =6.9°C. By comparison, the circumferential temperature difference of the roller is small and the circumferential temperature uniformity is good.

[0151] The actual axial temperature difference between each section in S6 is the extreme difference value ΔT of the temperature set of each section a-real =13.8℃. By comparison, the axial temperature difference of the roller is small and the axial temperature uniformity is good.

[0152] In S7, after the roller temperature and the temperature difference between the axis and the circumference meet the preset values, the test is continued for 3 minutes. No temperature fluctuation of more than 5°C is found in the three indicators. At this time, the warm roller is in good stability.

[0153] S8: Based on the constructed warm roll temperature field, rolling is performed.

[0154] The technical effect of this invention is the use of electromagnetic induction heating devices that are jointly controlled inside and outside the roll. The internal device achieves internal temperature rise, effectively avoiding the problems of low heat penetration and high heat dissipation from the roll surface under external heating. The external device acts as a supplementary means to moderately absorb some of the roll temperature rise and promote uniform roll surface temperature. The combined operation of the internal and external induction heating devices significantly improves the roll temperature hit rate and the ability to control both axial and circumferential temperature.

[0155] The present invention utilizes electromagnetic induction heating devices arranged in multiple sections within the roller and induction heaters arranged in multiple sections outside the roller, leveraging the combined control of these internal and external heating devices to achieve multi-segment axial roller temperature control. The multi-segmented electromagnetic induction heating devices employed in this invention are densely packed axially to fill axial voids and enhance the roller's axial stiffness. Furthermore, in terms of radial cross-section, the device's fan-shaped heating block structure, combined with its small-angle, evenly spaced layout, meets the requirements for circumferential temperature uniformity for this type of roller while minimizing variations in circumferential stiffness.

[0156] The present invention encompasses any alternatives, modifications, equivalents, and solutions that fall within the spirit and scope of the present invention. To provide a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art will be able to fully understand the present invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0157] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A plate and strip mill warming roller device with internal and external electromagnetic joint control, characterized in that: The roll core is evenly divided into an operating side and a transmission side, and the operating side and the transmission side are respectively provided with a heating device group. The operating side and the transmission side are each divided into at least two sections. Each section of the operating side and each section of the transmission side is provided with a heating device group, and each heating device group is correspondingly provided with a temperature-averaging ring. The number and position of the induction heater groups outside the rollers correspond to the number and position of the heating device groups provided on the roller cores; The heating device group includes induction heating blocks arranged at equal intervals. The heating device group and the roller outer induction heater group are controlled by electromagnetic induction. Temperature measuring devices are provided inside and outside the roller. The roller core has a stepped symmetrical structure on both sides with the central axis as the symmetry axis, each step on the operating side corresponds to each of the areas divided on the operating side, and each step on the transmission side corresponds to each of the areas divided on the transmission side; a roller sleeve is provided on the outer shell of the temperature uniformity ring; A heating device group is provided on the steps corresponding to each area of the operating side and the transmission side, and the heating device groups in the symmetrical areas are also arranged symmetrically.

2. The plate and strip mill warm roller device with internal and external electromagnetic joint control according to claim 1 is characterized in that: The stepped structure arrangement on both sides of the central axis of the roller core includes: Five steps are arranged from the end of the roller core to the middle of the roller core. The outermost step on the operating side and the transmission side is the first step, and the first step is used to carry the roller bearing; the second to fifth steps are arranged in sequence from the first step to the middle of the roller core on the operating side and the transmission side.

3. The plate and strip mill warm roller device with internal and external electromagnetic joint control according to claim 2 is characterized in that: The operating side and the transmission side are divided into the same areas, both including: Zone II, Zone III and Zone IV; the second to fourth steps of the operating side correspond to Zones IV to II of the operating side respectively; the second to fourth steps of the transmission side correspond to Zones IV to II of the transmission side respectively; the fifth steps of the operating side and the transmission side are flush and coplanar and correspond to the center Zone I of the middle of the roller core.

4. The plate and strip mill warm roller device with internal and external electromagnetic joint control according to claim 3 is characterized in that: The central zone I is provided with a zone I electromagnetic induction heating device.

5. The plate and strip mill warm roller device with internal and external electromagnetic joint control according to claim 2, characterized in that: On the operating side, the diameters of the steps from the first step to the fifth step become larger in sequence; On the transmission side, the step diameters from the first step to the fifth step increase sequentially.

6. The plate and strip mill warming roller device with internal and external electromagnetic joint control according to claim 4 is characterized in that: The outer roller induction heater group is arranged outside the roll core and is divided into an operating side and a transmission side that are the same as the roll core. The operating side and the transmission side of the outer roller induction heater group correspond to the operating side and the transmission side of the roll core respectively in length position. The operating side of the roller outer induction heater group is divided into zone II, zone III and zone IV which are the same as the operating side of the roll core, and the zones II, III and IV on the operating side of the roller outer induction heater group correspond one to one with the zones II, III and IV on the operating side of the roll core; The transmission side of the roller outer induction heater group is divided into zone II, zone III and zone IV which are the same as the transmission side of the roll core, and the zones II, III and IV on the transmission side of the roller outer induction heater group correspond one to one with the zones II, III and IV on the transmission side of the roll core; The middle portion of the roller outer induction heater group is divided into a center zone I which is the same as the middle portion of the roller core, and the center zone I of the roller outer induction heater group corresponds in position and length to the center zone I of the roller core; Each divided area of the roller outer induction heater group is independently powered; the axial length of each partition of the roller outer induction heater group is equal to the axial length of the heating device group of each partition of the corresponding roller core.

7. A method for operating a warm roll device for a plate and strip rolling mill with internal and external electromagnetic joint control, the method utilizing the warm roll device for a plate and strip rolling mill with internal and external electromagnetic joint control as claimed in any one of claims 1 to 6, characterized in that: The method comprises the following steps: S1. Preset warm roller process parameters; S2. Calculate the power distribution of the electromagnetic joint control inside and outside the roller according to the weight ratio coefficient; S3, switching the warm roller device to the internal and external electromagnetic joint control mode to realize the internal electromagnetic induction heating control of the warm roller device; S4, regulating the warm roller; comparing the actual temperature outside the roller with the preset temperature Tt to realize the external electromagnetic induction heating control of the warm roller device; S5. Coordinate and control the circumferential temperature uniformity of the roll according to the temperature values of each section of the roll surface; S6. Coordinate and control the axial temperature uniformity of the roll according to the temperature values of each section of the roll surface; S7, check the stability of the warm roller; S8. Execute rolling based on the constructed warm roll temperature field.

8. The method for operating the warm roller device of a plate and strip rolling mill with internal and external electromagnetic joint control according to claim 7, characterized in that: The preset process parameters of the warm roller in S1 include: S101, according to the upper limit temperature T of the heating of the roller material max Calculate the target setting value of roller temperature T according to the suitable rolling temperature range [T1, T2] of the rolled material t , where T1 is the minimum temperature suitable for rolling of the rolled material, T2 is the maximum temperature suitable for rolling of the rolled material, and the target setting value of the roll temperature T t The calculation formula is formula (1): S102, according to the roller temperature target setting value T t , calculate the overall roller temperature deviation ΔT h , roller axial temperature deviation ΔT a And the roller circumferential temperature deviation ΔT r , the overall roller temperature deviation ΔT h , the roller axial temperature deviation value ΔT a And the roller circumferential temperature deviation value ΔT r The calculation formula is formula (2): S103, according to the roller temperature target setting value T t And the overall roller temperature deviation ΔT h , set the weight ratio coefficient of the roller inner heating device group and the roller outer induction heater group to k n With k y , and k n >k y According to the roller axial temperature deviation value ΔT a And the roller circumferential temperature deviation value ΔT r , set the rotation speed v of the warm roller; The internal and external electromagnetic joint control power distribution of S2 includes: S201, according to the weight ratio coefficient k in S103 n With k y , the roller warming power P roll Divided into internal temperature rise power p n and external temperature rise power p y , the internal temperature rise power p n The calculation formula is formula (5), the external temperature rise power p y The calculation formula is formula (6): k1+k2=1 (4) Among them, k1 and k2 are efficiency coefficients; The endogenous electromagnetic induction heating control of the warm roller device in S3 includes: S301. Determine formula (5) based on formula (3) and formula (4): P n =k1P roll (5) The average coil power of the induction heating device group inside the roller is calculated. The average coil power of the IV, III and II zones on the operating side of the roller core and the IV, III and II zones on the transmission side of the roller core are all 0.125p n The average coil power of the center I zone of the roller core is 0.25p n ; S302: Prioritize driving the induction heating device group inside the roller to control the temperature field inside the roller, that is, prioritize the internal electromagnetic control mode until the roller surface temperature reaches 60% T t Then, the roller outer induction heater group is turned on, thereby switching to the internal and external electromagnetic joint control mode; The external electromagnetic induction heating control of the warm roller device in S4 includes: S401, formula (6) is obtained based on formula (3) and formula (4): P y =k2P roll (6) The average coil power of the roller outer induction heater group is calculated. The average coil power of the IV zone, III zone and II zone on the operating side of the roller outer induction heater group and the IV zone, III zone and II zone on the transmission side of the roller outer induction heater group are all 0.125p y The average coil power of the center zone I of the roller outer induction heater group is 0.25p y ; S402: After the system enters the internal and external electromagnetic joint control mode, the roller outer induction heater group and the spindle motor of the working roller are driven to adjust the roller warming according to the preset value of the roller warming roller rotation speed v; at the same time, the temperature average value of the roller outer temperature detection point is calculated based on the detection value of the temperature of each section detection point outside the roller by the external temperature measuring device. and the roller temperature target setting value T t Make a comparison; If the roller temperature stabilizes, At this time, the warm roller has a good effect; If the roller temperature stabilizes, This indicates that the temperature of the warm roller has not reached the preset temperature and needs to be increased. roll to 105% of the original parameter, and repeat step S2 until it reaches 9. The method for operating the warm roller device of a plate and strip rolling mill with internal and external electromagnetic joint control according to claim 8, characterized in that: The S5 coordinated control of the circumferential temperature uniformity of the rolls includes: S501, based on the temperature detection value of each section of the roller surface by the external temperature measuring device, calculate the actual temperature difference of the circumferential temperature of each section of the roller, and compare the circumferential temperature deviation value ΔT of the roller r The roll can be divided into multiple axial sections according to the operating side or transmission side, namely, Zone IV, Zone III, Zone II, and the center Zone I; each section is equipped with a roll surface temperature detection device to detect the temperature of each section in real time; S502, as the warm roller progresses, within a single warm roller cycle, [t, t+2πr / v], t is the minimum time within a single warm roller cycle, t+2πr / v is the maximum time within a single warm roller cycle, wherein r is the cross-sectional radius of the roll, and v is the rotation speed of the roll; The roller surface temperature detection device samples and calculates the temperature extreme difference ΔT in the section in real time r-real The value is used as the actual circumferential temperature difference of the section and the circumferential temperature deviation value of the roller ΔT r contrast; If ΔT r-real <ΔT r , then the circumferential temperature difference in this section is small and the circumferential temperature uniformity is good; If ΔT r-real >ΔT r , then there is a circumferential temperature non-uniformity problem in this section, and the temperature of the roller outer induction heater group in this section should be increased; S503: If there are three or more sections with circumferential temperature non-uniformity, it indicates that the roll speed of the warm roll process does not meet the circumferential temperature uniformity requirement, and the warm roll rotation speed v is increased by 5% of the original parameter; The S6 roll axial temperature uniformity coordinated control includes: S601, calculate the actual axial temperature difference between the sections of the roller according to the temperature detection value of each section of the roller surface by the external temperature measuring device of the roller, and compare the axial temperature deviation value ΔT of the roller a ; Among them, the actual axial temperature difference between each section is the extreme difference value ΔT of the temperature set of each section a-real ; S602: As the warm roller progresses, when step S402 shows that the warm roller is in good condition, real-time sampling and calculation of ΔT a-real , and make the following comparison: If ΔT a-real <ΔT a , then the axial temperature difference in this section is small and the axial temperature uniformity is good; If ΔT a-real >ΔT a , then there is a temperature non-uniformity problem in the axial direction of this section, and the current power in the area with large temperature difference should be increased; The S7 test for the stability of the warm roller includes: After the roller temperature and axial temperature difference and circumferential temperature difference meet the preset values, continue to test for 3 minutes. If ΔT h , ΔT a and ΔT r If there is no temperature fluctuation of more than 5℃, it is judged that the stability of the warm roller is good at this time; if ΔT h , ΔT a and ΔT r If temperature fluctuations exceed 5°C, the internal and external electromagnetic joint control heating devices must be switched to PID mode for continuous control.

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