Electrical steel coil heating device and cold rolling production line
By designing a heating device for electrical steel coils and using a heating method controlled by a heating tube group and a cover plate, the problem of brittle cracking of high-silicon electrical steel at low temperatures was solved, achieving efficient heating and reducing the risk of brittle cracking.
Patent Information
- Application Number
- CN202422110003.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-08-29
AI Technical Summary
High-silicon electrical steel is prone to brittle cracking in low-temperature environments, resulting in a high risk of brittle cracking during cold rolling in winter, affecting the normal operation of the continuous rolling mill.
A heating device for electrical steel coils is designed, which includes a box, a heating tube group, a saddle, and a drive mechanism. The steel coils are heated to above the ductile-brittle transition temperature by steam in the heating tube group, and the heating efficiency and thermal insulation effect are controlled by opening and closing the cover.
It effectively reduces the risk of brittle cracking of electrical steel strips during uncoiling and straightening, improves heating efficiency and saves energy.
Smart Images
Figure CN223454834U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of steel coil heating, and particularly relates to an electrical steel coil heating device and a cold rolling production line. BACKGROUND
[0002] The silicon content in high-silicon electrical steel is generally higher than 2.8%, and the ductile-brittle transition temperature thereof is relatively high. The strip is extremely prone to brittle cracking in a low-temperature environment. In a continuous rolling mill, the temperature of a factory building is relatively low in winter, and the brittle cracking risk of high-silicon electrical steel coils is great during uncoiling and straightening of the cold rolling mill, which greatly threatens the normal and stable operation of the continuous rolling mill. CONTENT OF THE UTILITY MODEL
[0003] To solve the technical problem of brittle cracking of electrical steel coils during uncoiling and straightening in winter, the application provides an electrical steel coil heating device and a cold rolling production line.
[0004] In the first aspect of the application, an electrical steel coil heating device is provided, comprising:
[0005] A box body and a cover plate are provided with an inner cavity and an opening communicating with the inner cavity;
[0006] A heating pipe group, the heating pipe group comprising a main inlet pipe, a main outlet pipe and a plurality of branch pipes, the main inlet pipe and the main outlet pipe being located outside the box body, the main inlet pipe being communicated with a steam pipe network, one end of each of the branch pipes being communicated with the main inlet pipe, and the other end being communicated with the main outlet pipe, the plurality of branch pipes being arranged on the cavity wall of the inner cavity to enclose a heating cavity;
[0007] A plurality of saddles for supporting the steel coil, the plurality of saddles being located in the heating cavity;
[0008] A driving mechanism for driving the cover plate to slide so as to open or close the opening.
[0009] In some embodiments, the heating pipe group is provided with two, and the two heating pipe groups are symmetrically arranged with the radial direction of the steel coil as the axis of symmetry, and the branch pipes of the two heating pipe groups enclose the heating cavity.
[0010] In some embodiments, the main inlet pipe and the main outlet pipe are both vertically arranged, and the two main outlet pipes are located on the outer side of the two main inlet pipes along the radial direction thereof.
[0011] In some embodiments, the heating pipe group further comprises a main valve and a drain valve, the main valve being communicated with the main inlet pipe, the drain valve being communicated with the main outlet pipe, and the main valve being located on the side of the main inlet pipe away from the box body.
[0012] In some embodiments, the heating tube set further comprises a plurality of intermediate heating tubes, each of which is in communication with a corresponding branch pipe at both ends, and the plurality of intermediate heating tubes are arranged in sequence along the vertical direction and located in the heating cavity to divide the heating cavity into sub-cavities, and the saddles are located in the sub-cavities.
[0013] In some embodiments, a plurality of cover plates are provided, each of which corresponds to two driving mechanisms, and the two driving mechanisms are located on both sides of the corresponding cover plate along the radial direction of the steel coil; when the plurality of cover plates cover the opening, the plurality of cover plates are arranged in sequence along the axial direction of the steel coil, and adjacent two cover plates are overlapped.
[0014] In some embodiments, both side walls of the box along the radial direction of the steel coil are provided with a rack corresponding to one half of the number of the cover plates, and the plurality of racks are arranged in sequence along the vertical direction, and the sawteeth of the racks face downward; the driving mechanism comprises a driving member and a gear, the housing of the driving member is connected to the corresponding slide plate, the output end of the driving member is rotatably arranged and connected to the gear, the gear is engaged with the sawteeth of the rack, and the two ends of the slide plate are rolled on the top surface of the corresponding rack through a supporting roller.
[0015] In some embodiments, the number of saddles is twice the number of cover plates.
[0016] In some embodiments, a temperature sensor and a heat preservation layer wrapped around the outer wall of the box are further included.
[0017] In the second aspect of the present application, a cold rolling production line is provided, which comprises an acid pickling unit, a steel coil heating device of the first aspect, and a cold rolling unit arranged in sequence along the process.
[0018] The electric steel coil heating device provided by the embodiment of the present application comprises a box, a cover plate, a heating pipe group, a plurality of saddles and a driving mechanism. The box is provided with an inner cavity and an opening communicating with the inner cavity, and the electric steel coil can enter the box through the opening. The heating pipe group comprises a main inlet pipe, a main outlet pipe and a plurality of branch pipes. The main inlet pipe and the main outlet pipe are located outside the box so as to be connected with a steam pipe network. The main inlet pipe is communicated with the steam pipe network, and the water vapor in the steam pipe network can enter the main inlet pipe. One end of each branch pipe is communicated with the main inlet pipe, and the other end is communicated with the main outlet pipe, so that the water vapor enters the branch pipe from the main inlet pipe and is discharged from the main outlet pipe. The plurality of branch pipes are arranged on the cavity wall of the inner cavity to enclose a heating cavity. The water vapor is heat dissipated to the heating cavity through the branch pipes, and then exchanges heat with the steel coil in the heating cavity to heat the steel coil. The plurality of saddles are located in the heating cavity and can support the steel coil to ensure the stability of the steel coil in the heating cavity. The driving mechanism is used to drive the cover plate to slide so as to open or close the opening. When the cover plate opens the opening, the steel coil can enter the heating cavity through the opening or leave the heating cavity through the opening. When the cover plate closes the opening, the cover plate can improve the heat preservation effect of the heating cavity and improve the heating efficiency of the steel coil.
[0019] Since the electric steel coil can be placed in the heating cavity enclosed by the branch pipes through the opening, and the water vapor flows in the branch pipes, the water vapor can heat the air in the heating cavity through the branch pipes, so as to heat the steel coil in the heating cavity to above the ductile-brittle transition temperature, and then the straight head of the coil is taken out. Because the temperature of the electric steel coil is high and the plasticity is good, the risk of brittle fracture in the process of uncoiling the straight head of the electric steel plate strip is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 The structure of the electric steel coil heating device is shown.
[0021] Figure 2 The front view of the electric steel coil heating device is shown.
[0022] Figure 3 The side view of Figure 2 is shown.
[0023] Figure 4 The A-A structure of Figure 2 is shown.
[0024] Figure 5 The partial enlarged view of Figure 4 is shown.
[0025] Figure 6 The assembly drawing of the cover plate, the driving mechanism and the box is shown.
[0026] MARKED DESCRIPTION:
[0027] 10 - box, 11 - inner cavity, 12 - rack, 13 - heat preservation layer, 20 - cover plate, 21 - supporting wheel, 31 - main inlet pipe, 32 - main outlet pipe, 33 - branch pipe, 331 - first pipe section, 332 - second pipe section, 34 - main valve, 35 - drain valve, 36 - intermediate heating pipe, 40 - saddle, 51 - driving member, 52 - gear, 60 - steel coil, 70 - temperature sensor. DETAILED DESCRIPTION
[0028] In order to make the skilled in the art to which the present application belongs more clearly understand the present application, the following will be combined with the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor are within the scope of protection of the present application.
[0029] The first aspect embodiment of the present application provides a steel coil heating device for electrical steel, which can heat the electrical steel coil above the ductile-brittle transition temperature to reduce the risk of brittle fracture during cold rolling and straightening.
[0030] Please refer to Figure 1 and Figure 2 The steel coil heating device for electrical steel provided by the present application comprises a box 10, a cover plate 20, a heating pipe group, a saddle 40 and a driving mechanism. The box 10 is provided with an inner cavity and an opening communicating with the inner cavity, and an electrical steel coil 60 can enter the box 10 through the opening. The heating pipe group comprises a main inlet pipe 31, a main outlet pipe 32 and a plurality of branch pipes 33. The main inlet pipe 31 and the main outlet pipe 32 are located outside the box 10 so as to be connected with a steam pipe network. The main inlet pipe 31 communicates with the steam pipe network, and water vapor in the steam pipe network can enter the main inlet pipe 31. One end of each branch pipe 33 communicates with the main inlet pipe 31, and the other end communicates with the main outlet pipe 32, so that the water vapor enters the branch pipe 33 from the main inlet pipe 31 and is discharged from the main outlet pipe 32. The plurality of branch pipes 33 are arranged on the cavity wall of the inner cavity to enclose a heating cavity. The water vapor is heat dissipated to the heating cavity through the branch pipe 33, and then exchanges heat with the steel coil 60 in the heating cavity to heat the steel coil 60. The saddle 40 is a common structure for placing the steel coil, and a plurality of saddles 40 are provided. The plurality of saddles 40 are located in the heating cavity and can support the steel coil 60 to ensure the stability of the steel coil 60 in the heating cavity. The driving mechanism is used to drive the cover plate 20 to slide so as to open or close the opening. When the opening is opened by the cover plate 20, the steel coil 60 can enter the heating cavity through the opening or leave the heating cavity through the opening. When the opening is closed by the cover plate 20, the cover plate 20 can improve the heat preservation effect of the heating cavity and improve the heating efficiency of the steel coil 60.
[0031] Because the electric steel coil 60 can be placed in the heating cavity enclosed by the branch pipes 33 through the opening, and the water vapor can flow through the branch pipes 33, the water vapor can heat the air in the heating cavity through the branch pipes 33, so as to heat the steel coil 60 in the heating cavity to above the ductile-brittle transition temperature, and then the straight head is taken out through the opening. Because the temperature of the electric steel coil 60 is high, the plasticity is good, so the risk of brittle fracture in the process of uncoiling the straight head of the electric steel strip is reduced.
[0032] In some embodiments, referring to Figure 2 two heating pipe groups are provided, the two heating pipe groups are symmetrically arranged with the radial direction of the steel coil 60 as the axis of symmetry, the branch pipes 33 of the two heating pipe groups enclose the heating cavity, and the two heating pipe groups can independently heat the steel coil 60 on both sides of the heating cavity along the radial direction of the steel coil 60 without affecting each other. In the case that the steel coil 60 is placed on one side of the heating cavity, only the heating pipe group on this side can be turned on, and the heating pipe group on the other side can be turned off to save energy. In other embodiments, one heating pipe group can also be provided, and the steel coil 60 in the heating cavity can still be heated.
[0033] In some embodiments, referring to Figure 2 The main inlet pipe 31 and the main outlet pipe 32 are vertically arranged, and the two main outlet pipes 32 are located on the outer side of the two main inlet pipes 31 along the radial direction of the main inlet pipes 31, that is, the main inlet pipes 31 and the main outlet pipes 32 are centrally arranged, which facilitates the maintenance of the main inlet pipes 31 and the main outlet pipes 32. In other embodiments, the main inlet pipes 31 and the main outlet pipes 32 can also be arranged in the horizontal direction, and the main inlet pipes 31 and the main outlet pipes 32 can also be distributed on opposite sides of the box body 10, and the circulation of water vapor and the heating of the steel coil 60 can still be achieved.
[0034] In some embodiments, referring to Figure 2 and Figure 3 The heating pipe group further comprises a main valve 34 and a drain valve 35. The main valve 34 is connected to the main inlet pipe 31, and the drain valve 35 is connected to the main outlet pipe 32. The main valve 34 is located on the side of the main inlet pipe 31 away from the box body 10, and can realize the conduction, cut-off and opening degree adjustment of the main inlet pipe 31. In the case that there is no heating demand for the steel coil 60, the main valve 34 realizes the cut-off of the main inlet pipe 31. In the case that there is a heating demand for the steel coil 60, the main valve 34 realizes the conduction of the main inlet pipe 31. In the case that the temperature in the heating cavity is low, the opening degree can be adjusted to be large, and in the case that the temperature in the heating cavity is high, the opening degree can be adjusted to be small. The drain valve 35 can be called a drain, also called an automatic drain or a condensate drain, and is installed at the terminal of the main outlet pipe 32 to continuously drain the condensed water in the branch pipe 33 to the outside of the pipeline.
[0035] In some embodiments, referring to
[0036] In some embodiments, referring to Figure 4 and Figure 5 the branch pipe 33 can include a first pipe segment 331 and a second pipe segment 332, the main inlet pipe 31, the first pipe segment 331, the second pipe segment 332 and the main outlet pipe 32 are sequentially communicated, the first pipe segment 331 and the second pipe segment 332 are arranged side by side, and the first pipe segment 331 and the second pipe segment 332 are close to the inner wall of the box body 10.
[0037] In some embodiments, referring to Figure 4 the heating pipe group further includes a plurality of intermediate heating pipes 36 corresponding in number to the branch pipes 33, the two ends of each intermediate heating pipe 36 are respectively communicated with corresponding branch pipes 33, the plurality of intermediate heating pipes 36 are sequentially arranged in the vertical direction and located in the heating cavity to divide the heating cavity into two sub-cavities, and the saddles 40 are located in the sub-cavities. In specific implementation process, one sub-cavity can be provided with one saddle 40, or a plurality of saddles 40. The arrangement of the intermediate heating pipes 36 can uniformly heat the four surrounding of the steel coil 60, thereby improving the heating efficiency. In some embodiments, the intermediate heating pipes 36 are arranged in a U shape, and the input end and the output end of the intermediate heating pipe 36 are respectively communicated with the first pipe segment 331 and the second pipe segment 332 to realize the circulation of water vapor in the intermediate heating pipe 36.
[0038] The plurality of intermediate heating pipes 36 corresponding in number to the branch pipes 33 are regarded as an intermediate heating pipe group, two heating pipe groups are symmetrically arranged with the radial direction of the steel coil 60 as the axis of symmetry, each heating pipe group is provided with one intermediate heating pipe group, that is, there are two intermediate heating pipe groups in total, and the two intermediate heating pipe groups are arranged in the axial direction of the steel coil 60 to divide the heating cavity into three sub-cavities. In other embodiments, each heating pipe group can be provided with a plurality of intermediate heating pipe groups, and the plurality of intermediate heating pipe groups are arranged in the axial direction of the steel coil 60 to divide the heating cavity into a plurality of sub-cavities arranged in sequence along the axial direction of the steel coil 60.
[0039] In some embodiments, referring to Figure 2 the cover plate 20 is provided in plurality, the plurality of cover plates 20 are sequentially arranged in the vertical direction, each cover plate 20 corresponds to two driving mechanisms, and the two driving mechanisms are respectively located on the two sides of the corresponding cover plate 20 along the radial direction of the steel coil 60; in the case that the plurality of cover plates 20 cover the opening, the plurality of cover plates 20 are sequentially arranged in the axial direction of the steel coil 60, and the adjacent two cover plates 20 are overlapped.
[0040] In some embodiments, referring to Figure 5, two side walls of the box 10 along the radial direction of the steel coil 60 are provided with a number of racks 12 corresponding to half the number of the cover plates 20, that is, one rack 12 corresponds to two cover plates 20, a plurality of racks 12 are sequentially arranged in the vertical direction, and the sawtooth of the rack 12 faces downward. The driving mechanism comprises a driving member 51, for example, a driving motor, and a gear 52. The housing of the driving member 51 is connected to the corresponding cover plate 20. The output end of the driving member 51 is rotatably arranged and connected to the gear 52. The gear 52 is engaged with the sawtooth of the rack 12. The two ends of the cover plate 20 are respectively rolled on the top surface of the corresponding rack 12 through the carrier roller 21. In the working process, the output end of the driving member 51 rotates, thereby driving the gear 52 to rotate. Since the rack 12 is fixed on the box 10 and remains stationary, the rotating gear 52 is engaged with the fixed rack 12, so that the gear 52 moves along the length direction of the rack 12, thereby driving the driving member 51 and the cover plate 20 to move along the length direction of the rack 12, so as to close or open the opening. In other embodiments, the two sides of the cover plate 20 along the radial direction of the steel coil 60 are connected with at least two rollers, and the two side walls of the box 10 along the radial direction of the steel coil 60 are provided with a number of support rails corresponding to half the number of the cover plates 20. A plurality of support rails are sequentially arranged in the vertical direction. The two cover plates 20 are rotatably arranged on the corresponding support rails through the rollers, and the opening of the box 10 can also be opened or closed by the cover plates 20.
[0041] In some embodiments, the number of cover plates 20 is twice the number of saddles 40, or the number of cover plates 20 is the same as the number of saddles 40. The number of cover plates 20 can be the same as the number of cavities. When the cover plates 20 close the opening, the cover plates 20 are located above the corresponding cavities. In the case of lifting in or out of the steel coil 60, only the corresponding cover plate 20 needs to be opened or closed, thereby reducing heat loss. In some embodiments, the number of cover plates 20 and the number of saddles 40 can both be six. In other embodiments, the number of cover plates 20 can also be different from the number of saddles 40, which is not limited in the present application.
[0042] In some embodiments, referring to Figure 2 The heating device further comprises a temperature sensor 70 and a heat preservation layer 13 wrapped on the outer wall of the box 10. The temperature sensor 70 can detect the temperature in the heating cavity to adjust the opening of the main valve 34 to achieve temperature regulation in the heating cavity. The heat preservation layer 13 can improve the heat preservation performance of the box 10 and improve the heating effect of the steel coil 60.
[0043] In some embodiments, the heating device further comprises a controller electrically connected to the driving member 51 to control the opening and closing of the cover plate 20.
[0044] In the second aspect of the present application, a cold rolling production line is provided, which comprises an acid pickling unit, a steel coil heating device according to any one of the first aspect embodiments, and a cold rolling unit arranged in sequence along the process.
[0045] The electric steel after pickling by the pickling unit can be placed in the heating cavity of the heating device, and after heating is completed, the steel coil 60 is unwound and straightened for cold rolling by the cold rolling unit.
[0046] The cold rolling production line further comprises a crane, which can hoist the pickled steel coil 60 into the heating cavity of the heating device, and can also hoist the heated steel coil 60 out to the unwinding position of the cold rolling unit.
[0047] The heating device of the present application has at least the following advantages:
[0048] (1) The cover plate 20 adopts a modular design, uses a multi-slide, splicing, and translational opening design, perfectly fits the equipment configuration and production needs of a silicon steel plant, has a compact and simple structure, low manufacturing cost, and strong heating capacity.
[0049] (2) The steel coil 60 is loaded and unloaded from the top, and the cover plate 20 can be opened according to the hoisting requirements to open the corresponding saddle 40 position, which reduces the opening degree of the cover plate 20 to the minimum under the condition of meeting the loading and unloading requirements of the steel coil 60, reduces energy loss, and reduces the overall space occupation by more than 20% compared with ordinary top-opening heating equipment.
[0050] (3) The steel coil 60 saddle 40 is configured inside, and the temperature in the box 10 is kept at about 90-100℃ for a long time, which can quickly heat the steel coil 60 in the box 10.
[0051] (4) Each branch is configured in a multi-circuit separate control form, and the heating capacity has a redundant setting, which has the ability to start and stop, increase and decrease the heating circuit according to the heating requirements and equipment state.
[0052] (5) A condensate water recovery system is provided to recover and reuse the steam condensate water.
[0053] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0054] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.
[0055] In the present application, unless otherwise expressly specified and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0056] In addition, in the present application, the description such as "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise expressly specified and limited.
[0057] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.
Claims
1. An electrical steel coil heating device, characterized in that, The application relates to an electric steel coil heating device. The device comprises a box body and a cover plate, an inner cavity and an opening communicating with the inner cavity; A heating pipe group, which comprises a main inlet pipe, a main outlet pipe and a plurality of branch pipes, the main inlet pipe and the main outlet pipe are located outside the box body, the main inlet pipe is communicated with a steam pipe network, one end of each branch pipe is communicated with the main inlet pipe, and the other end is communicated with the main outlet pipe, a plurality of branch pipes are arranged on the cavity wall of the inner cavity to enclose a heating cavity; A plurality of saddles for supporting the steel coil, and a plurality of saddles are located in the heating cavity; A driving mechanism for driving the cover plate to slide to open or close the opening.
2. The electrical steel coil heating apparatus of claim 1, wherein, The heating pipe group is provided with two heating pipe groups which are symmetrically arranged with the radial direction of the steel coil as the axis of symmetry, and the branch pipes of the two heating pipe groups enclose the heating cavity.
3. The electrical steel coil heating apparatus of claim 2, wherein, The main inlet pipe and the main outlet pipe are vertically arranged, and the two main outlet pipes are located on the outer side of the two main inlet pipes along the radial direction thereof.
4. The electrical steel coil heating apparatus of claim 2, wherein, The heating pipe group further comprises a main valve and a drain valve, the main valve is communicated with the main inlet pipe, the drain valve is communicated with the main outlet pipe, and the main valve is located on the side of the main inlet pipe away from the box body.
5. The electrical steel coil heating device according to any one of claims 1-4, characterized in that, The heating pipe group further comprises the same number of intermediate heating pipes as the number of branch pipes, the two ends of the intermediate heating pipe are respectively communicated with the corresponding branch pipes, a plurality of intermediate heating pipes are sequentially arranged in the vertical direction and located in the heating cavity to separate the heating cavity into sub-cavities, and the saddles are located in the sub-cavities.
6. The electrical steel coil heating device according to any one of claims 1-4, characterized in that, The cover plate is provided with a plurality of cover plates which are sequentially arranged in the vertical direction, each cover plate corresponds to two driving mechanisms, and the two driving mechanisms are respectively located on the two sides of the corresponding cover plate along the radial direction of the steel coil; in the case that a plurality of cover plates cover the opening, a plurality of cover plates are sequentially arranged along the axial direction of the steel coil, and adjacent two cover plates are overlapped.
7. The electrical steel coil heating device of claim 6, wherein, Both sides of the box body along the radial direction of the steel coil are provided with a rack corresponding to one half of the number of the cover plates, a plurality of racks are sequentially arranged in the vertical direction, and the sawtooth of the rack faces downward, the driving mechanism comprises a driving member and a gear, the housing of the driving member is connected to the corresponding cover plate, the output end of the driving member is rotatably arranged and connected to the gear, the gear is engaged with the sawtooth of the rack, and both ends of the cover plate are respectively rolled on the top surface of the corresponding rack through a supporting roller.
8. The electrical steel coil heating apparatus of claim 6, wherein, The number of saddles is twice the number of cover plates.
9. The electrical steel coil heating device of any one of claims 1-4, wherein, Further comprising a temperature sensor and a heat preservation layer wrapped on the outer wall of the box body.
10. A cold rolling line, characterized by The application relates to an electric steel coil heating device. The device comprises a box body and a cover plate, an inner cavity and an opening communicating with the inner cavity; A heating pipe group, which comprises a main inlet pipe, a main outlet pipe and a plurality of branch pipes, the main inlet pipe and the main outlet pipe are located outside the box body, the main inlet pipe is communicated with a steam pipe network, one end of each branch pipe is communicated with the main inlet pipe, and the other end is communicated with the main outlet pipe, a plurality of branch pipes are arranged on the cavity wall of the inner cavity to enclose a heating cavity; A plurality of saddles for supporting the steel coil, and a plurality of saddles are located in the heating cavity; A driving mechanism for driving the cover plate to slide to open or close the opening. The heating pipe group is provided with two heating pipe groups which are symmetrically arranged with the radial direction of the steel coil as the axis of symmetry, and the branch pipes of the two heating pipe groups enclose the heating cavity. The main inlet pipe and the main outlet pipe are vertically arranged, and the two main outlet pipes are located on the outer side of the two main inlet pipes along the radial direction thereof. The heating pipe group further comprises a main valve and a drain valve, the main valve is communicated with the main inlet pipe, the drain valve is communicated with the main outlet pipe, and the main valve is located on the side of the main inlet pipe away from the box body. The heating pipe group further comprises the same number of intermediate heating pipes as the number of branch pipes, the two ends of the intermediate heating pipe are respectively communicated with the corresponding branch pipes, a plurality of intermediate heating pipes are sequentially arranged in the vertical direction and located in the heating cavity to separate the heating cavity into sub-cavities, and the saddles are located in the sub-cavities. The cover plate is provided with a plurality of cover plates which are sequentially arranged in the vertical direction, each cover plate corresponds to two driving mechanisms, and the two driving mechanisms are respectively located on the two sides of the corresponding cover plate along the radial direction of the steel coil; in the case that a plurality of cover plates cover the opening, a plurality of cover plates are sequentially arranged along the axial direction of the steel coil, and adjacent two cover plates are overlapped. Both sides of the box body along the radial direction of the steel coil are provided with a rack corresponding to one half of the number of the cover plates, a plurality of racks are sequentially arranged in the vertical direction, and the sawtooth of the rack faces downward, the driving mechanism comprises a driving member and a gear, the housing of the driving member is connected to the corresponding cover plate, the output end of the driving member is rotatably arranged and connected to the gear, the gear is engaged with the sawtooth of the rack, and both ends of the cover plate are respectively rolled on the top surface of the corresponding rack through a supporting roller. The number of saddles is twice the number of cover plates. Further comprising a temperature sensor and a heat preservation layer wrapped on the outer wall of the box body. Including an acid washing unit, the electric steel coil heating device and a cold rolling unit which are sequentially arranged along a process.