Transverse magnetic flux induction heating twenty-high roll mill backing roll

Abstract

The invention belongs to the technical field of production control of cold-rolled strip steel in the metallurgical industry, and particularly relates to a twenty-high rolling mill backing roll with transverse magnetic flux induction heating, which comprises a mandrel and a plurality of saddle assemblies, and the saddle assemblies are uniformly arranged along the axial direction of the mandrel. A back lining bulging device is arranged between every two adjacent saddle assemblies, the back lining bulging devices are connected with the mandrel through bearings, magnetic gathering devices are installed between the back lining bulging devices and the bearings, and disc-shaped induction heating coils are installed between the magnetic gathering devices and the back lining bulging devices. Alternating current is utilized to generate an alternating magnetic field through the disc-shaped induction heating coil, eddy current is induced in the backing bulging device and converted into heat energy under the action of internal resistance, the roll shape can be regulated and controlled by directly changing the shape of the backing bulging device, and the roll shape adjusting step is simplified.

Description

Technical Field

[0001] The invention belongs to the technical field of cold-rolled strip steel production control in the metallurgical industry, and in particular relates to a twenty-high mill backing roller heated by transverse magnetic flux induction. Background Art

[0002] As an important product of the steel industry, the production capacity of cold-rolled steel strip reflects a country's technological strength in this field. Especially in high-end technology fields such as electronic communications and aerospace, the requirements for the shape and thickness of cold-rolled steel strip are becoming more and more stringent. The 20-roll cold rolling mill occupies an important position in the production of difficult-to-deform metal strips due to its unique advantages. However, the 20-roll rolling mill also has some complexity and cost issues, especially its roll shape adjustment mechanism.

[0003] First, the roll shape adjustment mechanism of the twenty-high mill is large and complex, which increases the number and complexity of the equipment. This complexity not only increases the manufacturing cost of the equipment, but also increases the difficulty of subsequent maintenance and operation. In particular, when adjusting the roll shape, it is necessary to rely on the coordinated work of multiple mechanisms and components, which increases the complexity and uncertainty of regulation; secondly, the radial adjustment of the roll shape relies on the eccentric mechanism to deform the support roll mandrel at the saddle assembly. Although this indirect regulation method can achieve the adjustment of the roll shape, it does not directly act on the backing bearing, thereby increasing the complexity and error of regulation. In addition, due to the nonlinear factors that may exist in the deformation process, the accuracy and stability of the regulation will also be affected; thirdly, as an important part of the twenty-high mill, the hydraulic system provides the necessary power and control functions, but also brings additional equipment costs and maintenance costs. The sealing requirements of the hydraulic system are extremely high. Once leaked, it will not only cause environmental pollution, but also pollute the surface of the strip, reducing the yield rate and production efficiency of the finished product. Summary of the invention

[0004] In order to solve the above-mentioned problems of redundant hydraulic mechanism and complicated roller shape adjustment, the present invention provides a twenty-roll mill backing roller with transverse magnetic flux induction heating.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A backing roller of a twenty-roller rolling mill for transverse magnetic flux induction heating comprises a core shaft and a saddle assembly, wherein the saddle assemblies are provided in plurality and are evenly arranged along the axial direction of the core shaft, a backing bulging device is arranged between two adjacent saddle assemblies, grooves are arranged at both ends of the backing bulging device, bearings are assembled in the grooves, the backing bulging device is connected to the core shaft through the bearings, a magnetic focusing device is installed between the backing bulging device and the bearings, a disc-shaped induction heating coil is installed between the magnetic focusing device and the backing bulging device, a pressing gear is installed at both ends of the core shaft by key connection, a distance ring is fixedly installed between the pressing gear and the saddle assembly, the distance ring is sleeved on the core shaft, an axial through hole is opened on the core shaft, a plurality of radial through holes corresponding to the disc-shaped induction heating coils are arranged on the core shaft, the axial through hole is connected to the radial through hole, and the two ends of the disc-shaped induction heating coil are connected to a variable frequency power supply.

[0007] Furthermore, a magnetic shielding ring is installed between the disc-shaped induction heating coil and the core shaft, one end face of the magnetic shielding ring is in contact with the bearing, and the other end face of the magnetic shielding ring is in contact with the backing bulging device. The magnetic shielding ring is used to enhance the internal temperature rise effect. The magnetic shielding ring is made of ceramic material to prevent other components from being heated.

[0008] Furthermore, a heat-insulating magnetic shielding ring is installed between the bearing and the magnetic focusing device. The heat-insulating magnetic shielding ring is interference-fitted with the backing bulging device to ensure normal rotation of the backing bulging device. The heat-insulating magnetic shielding ring is made of ceramic material to prevent other components from being heated.

[0009] Furthermore, the disc-shaped induction heating coil is made by winding the induction heating wire N times from the inside to the outside to achieve transverse magnetic flux heating. The disc-shaped induction heating coil is stacked with M layers along the axial direction to enhance the transverse magnetic flux heating effect.

[0010] Furthermore, the saddle assembly includes a wabe, which is fixedly connected to the frame, and the lower surface of the wabe is connected to a saddle ring by screws, the inner circle of the saddle ring is connected to the outer circle of the needle bearing, the inner circle of the needle bearing is connected to the outer ring of the eccentric ring, and the inner ring of the eccentric ring is installed on the core shaft by key connection.

[0011] Furthermore, a layer of heat insulating material is placed in the contact area between the backing bulging device and the mandrel to prevent heat transfer to the mandrel.

[0012] Furthermore, the magnetic field focusing device is an iron-based nanocrystalline alloy soft magnetic material, which is used to focus the magnetic flux generated around the disc-shaped induction heating coil.

[0013] Furthermore, a plurality of temperature sensors are evenly distributed between the backing bulging device and the disc-shaped induction heating coil, and the temperature sensors are used to accurately control the induction heating temperature.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. The present invention adopts the principle of electromagnetic induction heating, uses alternating current to pass through a disc-shaped induction heating coil to generate an alternating magnetic field, induces eddy currents inside the backing bulging device, and converts them into heat energy under the action of internal resistance. The roller shape can be regulated by directly changing the shape of the backing bulging device, simplifying the roller shape adjustment steps.

[0016] 2. The present invention adopts a magnetic field focusing device and uses a magnetic shielding ring and a heat-insulating magnetic shielding ring in combination, thereby improving the heating effect of electromagnetic induction.

[0017] 3. The present invention omits the complex hydraulic control mechanism and uses transverse magnetic flux induction heating instead, which has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the mandrel of the present invention;

[0020] Figure 3 It is a schematic diagram of the structure of the internal arrangement of the groove of the backing bulging device of the present invention;

[0021] Figure 4 It is a schematic structural diagram of the groove of the backing bulging device of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the disc-shaped induction heating coil of the present invention;

[0023] Figure 6 It is a structural schematic diagram of the magnetic field focusing device of the present invention;

[0024] Figure 7 It is a structural schematic diagram of the saddle assembly of the present invention;

[0025] Figure 8 A schematic diagram of the backing roller shape of the present invention;

[0026] In the figure, the core shaft 1, the axial through hole 101, the radial through hole 102, the saddle assembly 2, the wabe 201, the saddle ring 202, the needle bearing 203, the eccentric ring 204, the backing bulging device 3, the groove 4, the bearing 5, the magnetic focusing device 6, the disc-shaped induction heating coil 7, the pressing gear 8, the distance ring 9, the magnetic shielding ring 10, and the heat-insulating magnetic shielding ring 11. DETAILED DESCRIPTION

[0027] In order to further illustrate the technical solution of the present invention, the present invention is further described below through embodiments.

[0028] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 7 As shown, a backing roller of a twenty-roll mill with transverse magnetic flux induction heating comprises a core shaft 1 and a saddle assembly 2, wherein the saddle assembly 2 has a plurality of saddle assemblies 2, and the saddle assemblies 2 are evenly arranged along the axial direction of the core shaft 1, and a backing bulging device 3 is arranged between two adjacent saddle assemblies 2, and a heat-insulating material layer is placed in the contact area between the backing bulging device 3 and the core shaft 1 to prevent heat transfer to the core shaft 1, grooves 4 are arranged at both ends of the backing bulging device 3, and bearings 5 ​​are assembled in the grooves 4, and the backing bulging device 3 is connected to the core shaft 1 through the bearings 5, and a magnetic concentrator 6 is installed between the backing bulging device 3 and the bearings 5, and a disc-shaped induction heating coil 7 is installed between the magnetic concentrator 6 and the backing bulging device 3, and a plurality of temperature sensors are evenly distributed between the backing bulging device 3 and the disc-shaped induction heating coil 7, and the temperature sensors are used to accurately control the induction heating temperature, and the magnetic concentrator 6 is an iron-based nanocrystalline alloy soft magnetic material, which is used to gather the magnetic flux generated around the disc-shaped induction heating coil 7, and the bearings 5 ​​and the magnetic concentrator 6 are connected. A heat-insulating and magnetic-shielding ring 11 is installed between the core shaft 1 and the saddle assembly 2. The heat-insulating and magnetic-shielding ring 11 has an interference fit with the backing bulging device 3 to ensure the normal rotation of the backing bulging device 3. The heat-insulating and magnetic-shielding ring 11 is made of ceramic material to prevent other components from being heated. A pressing gear 8 is installed at both ends of the core shaft 1 by a key connection. A distance ring 9 is fixedly installed between the pressing gear 8 and the saddle assembly 2. The distance ring 9 is sleeved on the core shaft 1. A magnetic-shielding ring 10 is installed between the disc-shaped induction heating coil 7 and the core shaft 1. The magnetic-shielding ring One end face of the magnetic shielding ring 10 is in contact with the bearing 5, and the other end face of the magnetic shielding ring 10 is in contact with the backing bulging device 3. The magnetic shielding ring 10 is used to improve the internal temperature rise effect. The magnetic shielding ring 10 is made of ceramic material to prevent other components from being heat transferred. An axial through hole 101 is opened on the core shaft 1, and a plurality of radial through holes 102 corresponding to the disc-shaped induction heating coil 7 are arranged on the core shaft 1. The axial through hole 101 is connected to the radial through hole 102, and both ends of the disc-shaped induction heating coil 7 are connected to the variable frequency power supply.

[0029] like Figure 5 As shown, the saddle assembly 2 includes a wafer 201, which is fixedly connected to the frame. The lower surface of the wafer 201 is connected to a saddle ring 202 by screws. The inner circle of the saddle ring 202 is connected to the outer circle of a needle roller bearing 203. The inner circle of the needle roller bearing 203 is connected to the outer ring of an eccentric ring 204. The inner ring of the eccentric ring 204 is installed on the core shaft 1 by a key connection.

[0030] like Figure 6As shown, the disc-shaped induction heating coil 7 is made of an induction heating wire wound N times from inside to outside to achieve transverse magnetic flux heating. The disc-shaped induction heating coil 7 is stacked with M layers along the axial direction to enhance the transverse magnetic flux heating effect.

[0031] The present invention adopts the principle of electromagnetic induction heating, and uses alternating current to generate an alternating magnetic field through a disc-shaped induction heating coil 7, inducing eddy currents inside the backing bulging device 3, which are converted into thermal energy under the action of internal resistance. The backing bulging device 3 expands due to heat, thereby realizing roller shape regulation and further realizing plate shape control.

[0032] The above shows and describes the main features and advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0033] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A twenty-high mill backing roll heated by transverse magnetic flux induction, characterized in that: The invention comprises a core shaft (1) and a saddle assembly (2), wherein the saddle assembly (2) is provided in a plurality and the saddle assemblies (2) are evenly arranged along the axial direction of the core shaft (1), a backing bulging device (3) is provided between two adjacent saddle assemblies (2), grooves (4) are provided at both ends of the backing bulging device (3), bearings (5) are installed in the grooves (4), the backing bulging device (3) is connected to the core shaft (1) via the bearings (5), a magnetic concentrator (6) is installed between the backing bulging device (3) and the bearings (5), and a magnetic concentrator (6) is installed between the magnetic concentrator (6) and the backing bulging device (3). A disc-shaped induction heating coil (7) is installed, and the two ends of the core shaft (1) are equipped with a pressing gear (8) by key connection. A distance ring (9) is fixedly installed between the pressing gear (8) and the saddle assembly (2), and the distance ring (9) is sleeved on the core shaft (1). The core shaft (1) is provided with an axial through hole (101), and the core shaft (1) is provided with a plurality of radial through holes (102) corresponding to the disc-shaped induction heating coil (7) one by one. The axial through hole (101) is connected to the radial through hole (102), and the two ends of the disc-shaped induction heating coil (7) are connected to a variable frequency power supply.

2. A twenty-high mill backing roll with transverse magnetic flux induction heating according to claim 1, characterized in that: A magnetic shielding ring (10) is installed between the disc-shaped induction heating coil (7) and the core shaft (1); one end face of the magnetic shielding ring (10) is in contact with the bearing (5), and the other end face of the magnetic shielding ring (10) is in contact with the backing bulging device (3); the magnetic shielding ring (10) is used to enhance the internal temperature rise effect; the magnetic shielding ring (10) is made of ceramic material to prevent other components from being heated.

3. A twenty-high mill backing roll with transverse magnetic flux induction heating according to claim 1, characterized in that: A heat-insulating magnetic shielding ring (11) is installed between the bearing (5) and the magnetic focusing device (6); the heat-insulating magnetic shielding ring (11) is interference-fitted with the backing bulging device (3) to ensure normal rotation of the backing bulging device (3); and the heat-insulating magnetic shielding ring (11) is made of ceramic material to prevent other components from being heated.

4. A twenty-high mill backing roll with transverse magnetic flux induction heating according to claim 1, characterized in that: The disc-shaped induction heating coil (7) is made by winding an induction heating wire N times from the inside to the outside to achieve transverse magnetic flux heating. The disc-shaped induction heating coil (7) is stacked with M layers in the axial direction to enhance the transverse magnetic flux heating effect.

5. The twenty-high mill backing roll with transverse magnetic flux induction heating according to claim 1, characterized in that: The saddle assembly (2) comprises a wafer (201), wherein the wafer (201) is fixedly connected to a frame, and a saddle ring (202) is connected to the lower surface of the wafer (201) by screws, wherein the inner circle of the saddle ring (202) is connected to the outer circle of a needle roller bearing (203), and the inner circle of the needle roller bearing (203) is connected to the outer ring of an eccentric ring (204), and the inner ring of the eccentric ring (204) is mounted on the core shaft (1) by means of a key connection.

6. A twenty-high mill backing roll heated by transverse magnetic flux induction heating according to claim 1, characterized in that: A heat-insulating material layer is placed in the contact area between the backing bulging device (3) and the mandrel (1) to prevent heat transfer to the mandrel (1).

7. A twenty-high mill backing roll heated by transverse magnetic flux induction heating according to claim 1, characterized in that: The magnetic field collecting device (6) is made of an iron-based nanocrystalline alloy soft magnetic material and is used to collect the magnetic flux generated around the disc-shaped induction heating coil (7).

8. The twenty-high mill backing roll heated by transverse magnetic flux induction heating according to claim 1, characterized in that: A plurality of temperature sensors are evenly distributed between the backing bulging device (3) and the disc-shaped induction heating coil (7), and the temperature sensors are used to accurately control the induction heating temperature.

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