A composite structure electric heating roller device with independent temperature control function
By designing a composite structure electric heating roller device with independent temperature control, the problem of uneven temperature caused by rapid heat dissipation at the edge of the sheet was solved by using gradient heating, thereby improving the uniformity of sheet deformation and the forming quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
- Filing Date
- 2026-04-15
- Publication Date
- 2026-06-09
AI Technical Summary
Traditional hot rolling composite methods suffer from uneven temperature and edge cracking due to rapid heat dissipation at the edges of the sheet during the rolling process. Existing preheating rolling rolls cannot effectively compensate for the temperature drop at the edges of the sheet, resulting in uneven deformation.
Design a composite structure electrically heated roll device with independent temperature control function. It adopts a covered electric heating layer and a wedge-shaped insulating bushing structure. Gradient heating is achieved through arc contour design and embedded graphene surface contact. Combined with independent upper and lower power supply units and a hydraulic cylinder pressing auxiliary system, gradient heating and temperature compensation in the width direction of the plate are realized.
It effectively improves the metal flowability at the edge of the sheet, enhances the density of the interface bonding and the coordination of deformation, reduces the risk of edge cracking, and improves the forming quality and yield.
Smart Images
Figure CN122164751A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of metal layered composite plate rolling forming, and in particular to a composite structure electrically heated rolling mill device with independent temperature control function. Background Technology
[0002] Layered metal composite plates can combine the excellent properties of two or more different metals, achieving comprehensive performance that is difficult to achieve with a single metal. They also save precious metals, reduce costs, and increase efficiency, making them a key material in high-end equipment and energy-saving fields. However, in the traditional hot-rolling composite method, the direct contact between the cold rolls and the hot-rolled workpiece during rolling causes the surface metal to cool instantly. This not only easily leads to problems such as roll sticking and surface cracks, but also results in excessively low roll temperatures causing the surface layer of the plate to be hard while the core is soft, leading to uneven deformation of the plate.
[0003] In recent years, in response to the problems existing in the traditional hot rolling composite method, many methods have been implemented to preheat the rolls before rolling, which effectively improves the temperature difference between the rolls and the hot rolled workpiece, making the plasticity of the sheet more coordinated during the deformation process, thereby significantly improving the interface bonding quality and sheet shape accuracy.
[0004] However, preheating the rolls during rolling also has certain technical limitations and potential drawbacks. After the sheet and rolls are heated, the edges dissipate heat relatively quickly, resulting in uneven overall temperature distribution. The rolls cannot effectively compensate for the temperature drop at the edges of the sheet, leading to uneven sheet deformation and the risk of edge cracks.
[0005] Therefore, in order to solve the problems of uneven heat distribution and edge cracking caused by rapid heat dissipation at the edge of the plate during preheating rolling, it is urgent to develop a composite structure electrically heated rolling mill device that can effectively compensate for the temperature loss at the edge of the plate. Summary of the Invention
[0006] The purpose of this invention is to provide a composite structure electrically heated rolling mill device with independent temperature control function to solve the above-mentioned problems, effectively solve the problem of uneven temperature distribution during rolling, and improve the deformation uniformity and surface quality of metal layered composite plates.
[0007] To achieve the above objectives, the present invention provides the following solution: a composite structure electrically heated roll device with independent temperature control function, characterized in that: it includes a frame, a covered electrically heated roll assembly, and an electrical component; the covered electrically heated roll assembly includes a roll shaft, an electrically heated layer, a wedge-shaped insulating bushing, a roll sleeve, and an insulating coating; the electrically heated layer is made of a conductive material with suitable resistivity, its inner surface adopts an arc-shaped contour design, and its side is designed with an arc-shaped groove and uses embedded graphene surface contact conductivity to improve conductivity and achieve gradient heating and temperature compensation in the width direction of the plate; the electrically heated layer and the roll shaft are connected by an interference fit of a wedge-shaped insulating bushing, which also achieves electrical insulation between the electrically heated layer and the roll shaft; the roll sleeve is fitted onto and adheres to the outer surface of the electrically heated layer, and its inner wall is coated with an insulating coating to block current conduction to the roll sleeve; the electrical component is installed on the rear side of the frame through a guide rail to realize the electrically heated function of the roll, and is also compatible with the hydraulic cylinder pressing auxiliary system.
[0008] Preferably, the composite structure electrically heated roll device with independent temperature control function is characterized in that: the energizing component includes a conductive rod support, a conductive rod, a conductive extension rod, and a spring; the conductive rod support is connected to sliders at both ends and mounted on a guide rail, which is fixed to the rear side of the frame; the conductive rod passes horizontally through the conductive rod support and is supported by the conductive rod support; the bottom of the conductive extension rod is fitted onto the conductive rod inside the conductive rod support, one end of the spring is connected to one side of the bottom of the conductive extension rod, the other end of the spring is connected to one side inside the conductive rod support, the output end of the conductive extension rod extends towards the electric heating layer and maintains surface contact with the arc-shaped slot on the side of the electric heating layer, and the energizing component is vertically aligned with the frame. Independent upper and lower power supply units are set for the corresponding upper and lower covered electric heating roll assemblies. The upper power supply assembly can move up and down along the guide rail with the slider to adapt to the hydraulic cylinder pressing auxiliary system. The lower power supply assembly is fixed to the bottom of the guide rail. The position of the upper covered electric heating roll assembly is adjusted according to the required pressing rate. The position of the conductive rod support is adjusted by the guide rail and the slider. The position of the conductive extension rod is adjusted according to the length of the electric heating layer. The spring will continuously apply axial pressure to the conductive extension rod, so that its output end is stably attached to the side of the electric heating layer. After the pulse power supply is turned on, the current is transmitted to the electric heating layer through the conductive rod and the conductive extension rod. The electric heating layer is energized and heats up, and the heat is evenly transferred to the rolled plate through the roll sleeve.
[0009] The present invention has the following technical effects: 1. The inner surface of the electric heating layer adopts an arc-shaped contour design, which can realize gradient heating and temperature compensation along the width direction of the plate, effectively compensate for the heat loss at the edge of the plate, and reduce the risk of edge cracking during rolling. 2. This gradient heating method can improve the fluidity of the metal at the edge of the plate, promote the migration and diffusion of interfacial substances, and make the edge interface more dense and uniform. 3. Gradient heating can significantly improve the problem of uneven temperature distribution in the sheet during rolling, improve the plasticity uniformity and deformation coordination of the sheet, ensure the overall forming quality, and increase the yield. 4. A wedge-shaped insulating bushing is installed between the roller and the electric heating layer to form an interference fit, which can not only make the three parts fit tightly, but also effectively isolate the current and prevent the current from flowing into the roller. 5. The power supply component is arranged on the rear side of the rolling mill and is integrated and installed through guide rails and sliders. It does not affect the rotation of the rolls and the workpiece feed. The slider can be moved along the guide rail to flexibly adjust the contact position with the electric heating layer. The power supply component is set as two independent power supply units, which can achieve simultaneous power supply heating or individual power supply heating. Attached Figure Description
[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0011] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 2 This is a schematic diagram of the encased electrically heated roll assembly of the present invention. Figure 3 This is a schematic diagram of the power-conducting component of the present invention. Among them, 1. Frame; 2. Roller; 3. Electric heating layer; 4. Wedge-shaped insulating bushing; 5. Roller sleeve; 6. Insulating coating; 7. Guide rail; 8. Hydraulic cylinder; 9. Conductive rod support; 10. Conductive rod; 11. Conductive extension rod; 12. Spring; 13. Slider; 14. Pulse power supply; 15. Rolled plate; 16. Cable; 17. Switch; 18. Switch. Detailed Implementation Plan
[0012] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described examples are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0013] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0014] Reference Figure 1-3This embodiment provides a composite structure electrically heated roller device with independent temperature control function, characterized in that: it includes a frame (1), a covered electrically heated roller assembly, and an electrically connected assembly; the covered electrically heated roller assembly includes a roller shaft (2), an electrically heated layer (3), a wedge-shaped insulating bushing (4), a roller sleeve (5), and an insulating coating (6); the electrically heated layer (3) is made of a conductive material with a suitable resistivity, and its inner surface adopts an arc-shaped contour design, and its contour curve can adopt a sine curve, cosine curve, etc., and the side is designed with an arc-shaped groove and adopts embedded graphene surface contact conductivity to improve conductivity and realize gradient heating and temperature compensation in the width direction of the plate; the wedge-shaped insulating bushing (4) is connected to the roller shaft (2) The two ends are axially embedded in the gap between the roller shaft (2) and the electric heating layer (3). The inner hole and the outer cylindrical surface of the roller shaft (2) and the outer surface and the inner surface of the electric heating layer (3) are respectively interference connected to achieve tight fit and circumferential and axial positioning of the three. At the same time, the electric heating layer (3) and the roller shaft (2) are electrically insulated to block the current conduction. The roller sleeve (5) is made of high thermal conductivity material, fitted on the outer surface of the electric heating layer (3) and attached to it. Its inner wall is coated with an insulating coating (6) to block the current conduction to the roller sleeve (5). The power supply component is installed on the rear side of the frame (1) through the guide rail (7) to realize the power supply heating function of the roll, and at the same time, it is compatible with the pressing auxiliary system of the hydraulic cylinder (8).
[0015] Further optimization of the scheme: the power-conducting components include a conductive rod bracket (9), a conductive rod (10), a conductive extension rod (11), and a spring (12); the conductive rod bracket (9) is connected to sliders (13) at both ends and mounted on a guide rail (7), which is fixed to the rear side of the frame (1); the conductive rod (10) passes horizontally through the conductive rod bracket (9) and is supported by the conductive rod bracket (9); the bottom of the conductive extension rod (11) is fitted onto the conductive rod (10) inside the conductive rod bracket (9), and one end of the spring (12) is connected to one side of the bottom of the conductive extension rod (11), while the other end of the spring (12) is connected to the conductive rod. Inside the bracket (9), the output end of the conductive extension rod (11) is made of graphene material and extends towards the electric heating layer (3), maintaining surface contact with the arc-shaped slot on the side of the electric heating layer (3) to achieve rotational power supply; the power supply component is provided with upper and lower independent power supply units respectively for the upper and lower covered electric heating roller components along the vertical direction of the frame (1). The upper power supply component can move up and down along the guide rail (7) with the slider (13) to adapt to the pressing auxiliary system of the hydraulic cylinder (8). The lower power supply component is fixed to the bottom end of the guide rail (7). The upper covered electric heating roller component is adjusted according to the required pressing rate. The position is adjusted by the guide rail (7) and the slider (13) working together to drive the conductive rod bracket (9) to move along the guide rail (7), thereby adjusting the overall position of the power supply assembly. Then, the position of the conductive extension rod (11) is adjusted according to the axial length of the electric heating layer (3). The spring (12) will continuously apply axial pressure to the conductive extension rod (11), so that its output end forms a stable surface contact with the side of the electric heating layer (3), ensuring reliable current transmission and laying the foundation for subsequent roll heating and rolling operations. The power supply of each power supply unit is controlled by the switches (17) and (18) on the parallel cable (16). The power source of the component is a pulse power supply (14), which is independently installed on the ground on one side of the frame (1). It is connected to the two ends of the conductive rod (10) in the energized component through the cable (16) to form a complete power supply circuit. After the pulse power supply (14) is turned on, the current is stably transmitted to the electric heating layer (3) through the conductive rod (10) and the conductive extension rod (11). The electric heating layer (3) generates uniform heat after being energized. The heat is conducted through the roller sleeve (5) and then directly acts on the rolled plate (15) entering the roll gap by the roller sleeve (5), so that the rolled plate (15) maintains a uniform and stable process temperature during the rolling process.
[0016] Compared to traditional rolling mill equipment, the core advantage and innovation of this invention lies in the design of a covered electric heating roll assembly. By using gradient heating of the electric heating layer to compensate for temperature, it reduces the occurrence of cracks at the edge of the plate, making the plate temperature more uniform during rolling, improving the plasticity uniformity and deformation coordination of the plate. Furthermore, it adopts a parallel power supply circuit, which can independently supply power to the upper and lower rolls to meet the needs of different materials and processes.
[0017] In the description of this invention, it should be understood that the terms "upper", "lower", "rear", "inner", "outer", "bottom", "horizontal", "vertical", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.
[0018] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims
1. A composite structure electrically heated roll device with independent temperature control function, characterized in that: The device includes a frame (1), an encased electric heating roll assembly, and an energizing assembly. The encased electric heating roll assembly includes a roll shaft (2), an electric heating layer (3), a wedge-shaped insulating bushing (4), a roll sleeve (5), and an insulating coating (6). The electric heating layer (3) is made of a conductive material with suitable resistivity. Its inner surface adopts an arc-shaped contour design, and the side is designed with an arc-shaped groove. It adopts embedded graphene surface contact conductivity to improve conductivity and realize gradient heating and temperature compensation in the width direction of the plate. The electric heating layer (3) and the roll shaft (2) are interference-fitted by a wedge-shaped insulating bushing (4). The roll sleeve (5) is fitted onto the outer surface of the electric heating layer (3) and fits against it. Its inner wall is coated with an insulating coating (6) to block the current from being conducted to the roll sleeve (5). The energizing assembly is installed on the rear side of the frame (1) through a guide rail (7) to realize the energizing heating function of the roll and is also compatible with the pressing auxiliary system of the hydraulic cylinder (8).
2. The composite structure electrically heated roll device with independent temperature control function according to claim 1, characterized in that: The power-conducting assembly includes a conductive rod bracket (9), a conductive rod (10), a conductive extension rod (11), and a spring (12). The conductive rod bracket (9) is connected to sliders (13) at both ends and mounted on a guide rail (7). The guide rail (7) is fixed to the rear side of the frame (1). The conductive rod (10) passes horizontally through the conductive rod bracket (9) and is supported by the conductive rod bracket (9). The bottom of the conductive extension rod (11) is fitted onto the conductive rod (10) inside the conductive rod bracket (9). One side of the bottom of the conductive extension rod (11) is connected to one end of the spring (12), and the other end of the spring (12) is connected to one side inside the conductive rod bracket (9). The output end of the conductive extension rod (11) extends toward the electric heating layer (3) and maintains surface contact with the arc-shaped slot on the side of the electric heating layer (3). The power-conducting assembly corresponds to the upper and lower two covered electric heating elements along the vertical direction of the frame (1). The heating roll assembly is equipped with independent upper and lower power supply units. The upper power supply assembly can move up and down along the guide rail (7) with the slider (13) to adapt to the pressing auxiliary system of the hydraulic cylinder (8). The lower power supply assembly is fixed to the bottom of the guide rail (7). The upper covered electric heating roll assembly is adjusted according to the required pressing rate. The position of the conductive rod support (9) is adjusted by the guide rail (7) and the slider (13). The position of the conductive extension rod (11) is adjusted according to the length of the electric heating layer (3). The spring (12) will continuously apply axial pressure to the conductive extension rod (11) so that its output end is stably attached to the side of the electric heating layer (3). After the pulse power supply (14) is turned on, the current is transmitted to the electric heating layer (3) through the conductive rod (10) and the conductive extension rod (11). The electric heating layer (3) is energized and heats up, and the heat is evenly transferred to the rolled plate (15) through the roller sleeve (5).