An on-line treatment method for the roll nodules of a silicon steel continuous annealing line furnace

Abstract

This invention discloses an online treatment method for nodules on furnace rollers in a silicon steel annealing line. It relates to the silicon steel production field and aims to solve the problem of time-consuming, labor-intensive, and inefficient surface grinding of disassembled carbon rollers. The key technical solution includes the following steps: S1. Take a low-grade silicon steel plate weighing 15-25 tons and install it into the annealing furnace body; S2. Adjust the gas injector to stop supplying hydrogen used in the annealing process and continuously inject nitrogen into the furnace to maintain a pure nitrogen atmosphere; S3. Raise the internal temperature of the annealing furnace body to 800-950℃; S4. Start the silicon steel production line and perform carbon roller grinding operations. All carbon rollers are kept rotating, and pairs of carbon rollers are stopped sequentially until all carbon rollers are ground; S5. After grinding, start the production line in forward rotation, adjust the furnace atmosphere to hydrogen, raise the internal temperature of the annealing furnace body to 950-1050℃, and continue the annealing operation. This achieves the effect of rapid grinding without disassembling the carbon rollers, saving time and labor.

Description

Technical Field

[0001] This invention relates to the technical field of silicon steel production, and in particular to an online method for treating nodules on furnace rolls in a continuous annealing line for silicon steel. Background Technology

[0002] Annealing is a crucial process in silicon steel production. It's a metal heat treatment process involving slowly heating the metal to a specific temperature, holding it for a sufficient time, and then cooling it at an appropriate rate. The purpose is to reduce hardness, improve machinability, eliminate residual stress, stabilize dimensions, reduce deformation and cracking tendency, refine grain size, adjust microstructure, and eliminate structural defects. More precisely, annealing is a heat treatment process for materials, and continuous annealing furnaces are generally used in the annealing process of strip silicon steel.

[0003] In a current continuous annealing furnace, carbon rollers are used to transport steel strips. When producing high-grade silicon steel strips, the temperature inside the annealing furnace is high, between 950℃ and 1050℃. Under the influence of the furnace atmosphere, carbon and oil on the surface of the carbon rollers easily combine. After cooling, they condense into nodules that adhere to the outer wall of the carbon rollers, seriously affecting the surface quality. This results in scratches or slippage on the surface of the silicon steel strips during transport, requiring timely grinding. However, removing the carbon rollers from the annealing furnace for grinding is too time-consuming and labor-intensive. Summary of the Invention

[0004] The purpose of this invention is to provide an online method for treating nodules on furnace rolls in a silicon steel continuous annealing line.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] The system includes a silicon steel production line, which is equipped with an annealing furnace body. The annealing furnace body has several pairs of carbon rollers arranged along its width. A servo motor for driving the carbon rollers is fixedly installed on the outer wall of the annealing furnace. The two ends of the carbon rollers are rotatably connected to and extend through the inner wall of the annealing furnace body. A gas injection nozzle for adjusting the furnace atmosphere is fixedly installed on the inner wall of the annealing furnace body. The system is characterized by the following steps:

[0007] S1. Take a low-grade silicon steel plate weighing 15-25 tons and install it into the annealing furnace body;

[0008] S2. Adjust the gas injector to stop supplying hydrogen for the annealing process and continuously inject nitrogen into the furnace to maintain a pure nitrogen atmosphere;

[0009] S3. Increase the internal temperature of the annealing furnace body to 800-950℃;

[0010] S4. Start the silicon steel production line and carry out carbon sleeve roller grinding. Keep all carbon sleeve rollers rotating, and stop the rotating pairs of carbon sleeve rollers in sequence until all carbon sleeve rollers are ground.

[0011] S5. After the grinding is completed, start the production line to rotate forward, adjust the atmosphere inside the furnace to hydrogen, raise the internal temperature of the annealing furnace body to 950-1050℃, and continue the annealing operation.

[0012] By adopting the above technical solution, the low-grade silicon steel plate has a lower hardness compared to the low-grade silicon steel plate, and its softness and hardness are more suitable for grinding carbon rollers. By controlling the carbon rollers to stop rotating in sequence by a servo motor, and simultaneously controlling the reciprocating motion of the low-grade silicon steel plate, the stopped carbon rollers can be ground in sequence. Without disassembling the carbon rollers, the nodules on the surface of the carbon rollers can be easily ground off, which is convenient and efficient. The internal temperature is controlled at 800-950℃ to maintain a pure nitrogen atmosphere, which can effectively ensure that no new nodules are formed during the grinding process.

[0013] Furthermore, in step S2, the gas injection nozzle operates at a rate of 1000-1800 m³ / h. 3 Nitrogen gas is injected at a certain flow rate.

[0014] Furthermore, in step S4, the grinding speed of the paired carbon rollers is 10-100 m / min, and the grinding time of the paired carbon rollers is 10-40 min for forward rotation and the same amount of time for reverse rotation.

[0015] Furthermore, the surface of the low-grade silicon steel plate is coated with ceramic abrasive powder.

[0016] By adopting the above technical solutions, the ceramic grinding powder has high purity, good self-sharpening properties, resistance to acid and alkali corrosion, high temperature resistance, and stable thermal properties, which can effectively improve the grinding effect of low-grade silicon steel plates.

[0017] Furthermore, a wear measuring device for measuring the wear degree of the carbon sleeve roller is fixedly installed on the outer wall of the annealing furnace body. The annealing furnace body has a wear measuring opening through its inner wall for the wear measuring device to extend into. The wear measuring device includes an isolation protective cover, which is fixedly installed on the outer wall of the annealing furnace body to cover the wear measuring opening. A hydraulic telescopic column is fixedly engaged with the inner wall of the isolation protective cover. A semi-circular pressure plate is fixedly installed at the end of the hydraulic telescopic column. The semi-circular pressure plate is aligned with the carbon sleeve roller. An elastic pressure-sensitive pad is fixedly installed on the side of the semi-circular pressure plate near the carbon sleeve roller. Several pressure sensors are distributed inside the elastic pressure-sensitive pad.

[0018] Furthermore, the inner wall of the annealing furnace body is hinged with a heat insulation plate with a return spring, and the heat insulation plate covers the damage measurement opening.

[0019] By adopting the above technical solution, the semi-arc pressure plate is stored inside the protective cover when not in use, and will not be easily damaged by external factors affecting its performance. When needed, after the internal temperature of the annealing furnace body drops to room temperature, the hydraulic telescopic rod is extended, and the semi-arc pressure plate will push open the insulation plate through the damage measurement opening and enter the furnace until it moves to the designated position and touches the carbon sleeve roller. The pressure sensor measures the pressure feedback from various parts of the carbon sleeve roller. When the carbon sleeve roller has no wear or low wear, the feedback pressure is evenly distributed and the pressure is within the specified range. When the feedback pressure is unevenly distributed and less than a certain threshold, it can be determined that the carbon sleeve roller has reached the standard of needing replacement. The semi-arc pressure plates wrap around the carbon sleeve roller in pairs, which can measure the wear degree of various parts around the carbon sleeve roller from all directions. When the damage measurement device is not in use, the insulation plate will cover the damage measurement opening to prevent the high temperature backflow in the furnace from damaging the semi-arc pressure plate and its internal electronic components, effectively improving the service life of the damage measurement device.

[0020] In summary, the beneficial technical effects of the present invention are as follows:

[0021] 1. Low-grade silicon steel plates are used to grind off nodules, resulting in quick and efficient maintenance of carbon rollers without disassembly, thus improving the overall working efficiency of the equipment.

[0022] 2. Ceramic grinding powder was applied to low-grade silicon steel plates to improve the grinding effect of effective carbon rollers;

[0023] 3. A wear measurement device is adopted, which can conveniently and effectively measure and evaluate the wear of the carbon roller in all aspects. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention;

[0026] Figure 3 for Figure 2 Enlarged schematic diagram of the structure of section A in the middle.

[0027] In the diagram, 1. Annealing furnace body; 11. Gas injection nozzle; 2. Carbon roller; 3. Servo motor; 4. Low-grade silicon steel plate; 5. Damage measuring device; 51. Isolation protective cover; 52. Hydraulic telescopic column; 53. Damage measuring opening; 54. Semi-arc pressure plate; 55. Elastic pressure-sensitive pad; 56. Insulation board. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Reference Figure 1This invention discloses an online treatment method for nodules on furnace rollers in a silicon steel continuous annealing line. The method includes a silicon steel production line, an annealing furnace body 1, and several pairs of carbon rollers 2 arranged along the width of the furnace body 1. A servo motor 3 is fixedly installed on the outer wall of the furnace to drive the carbon rollers 2 to rotate. The two ends of the carbon rollers 2 are rotatably connected to and pass through the inner wall of the furnace body 1. A gas injection nozzle 11 for adjusting the furnace atmosphere is fixedly installed on the inner wall of the furnace body 1. The method is characterized by the following steps:

[0030] S1. Take a low-grade silicon steel plate 4 weighing 15-25 tons. The surface of the low-grade silicon steel plate 4 is coated with ceramic grinding powder and installed into the annealing furnace body 1.

[0031] S2. Adjust gas injector 11 to stop supplying hydrogen for the annealing process, and continuously inject nitrogen into the furnace to maintain a pure nitrogen atmosphere. Gas injector 11 should be set at 1000-1800 m³ / h. 3 Nitrogen gas is injected at a high flow rate;

[0032] S3. Increase the internal temperature of the annealing furnace body 1 to 800-950℃;

[0033] S4. Start the silicon steel production line and carry out the grinding operation of carbon sleeve roller 2. All carbon sleeve roller 2 are kept rotating, and the pairs of carbon sleeve roller 2 are stopped one by one and kept stationary until all carbon sleeve roller 2 are ground. The grinding speed of the pairs of carbon sleeve roller 2 is 10-100m / min, and the grinding time of the pairs of carbon sleeve roller 2 is 10-40min for forward rotation and the same time for reverse rotation.

[0034] S5. After the grinding is completed, start the production line to rotate forward, adjust the atmosphere inside the furnace to hydrogen, raise the internal temperature of the annealing furnace body 1 to 950-1050℃, and continue the annealing operation.

[0035] The friction between the carbon roller 2 and the surface of the low-grade silicon steel plate 4 smooths the carbon roller 2, eliminating product defects such as pits on the surface of the manufactured products. The low-grade silicon steel plate 4 has a lower hardness than the low-grade silicon steel plate 4, and its softness and hardness are more suitable for grinding the carbon roller 2. By controlling the carbon roller 2 to stop rotating in sequence by the servo motor 3, and simultaneously controlling the reciprocating motion of the low-grade silicon steel plate 4, the stopped carbon roller 2 can be ground in sequence. Without disassembling the carbon roller 2, the nodules on the surface of the carbon roller 2 can be easily ground off, which is convenient and efficient. The internal temperature is controlled at 800-950℃ to maintain a pure nitrogen atmosphere, which can effectively ensure that no new nodules are formed during the grinding process. The ceramic grinding powder has high purity, good self-sharpening properties, acid and alkali corrosion resistance, high temperature resistance, and stable thermal properties, which can effectively improve the grinding effect of the low-grade silicon steel plate 4.

[0036] Reference Figure 2 and Figure 3The annealing furnace body 1 has a wear measuring device 5 fixedly installed on its outer wall to measure the wear of the carbon roller 2. The annealing furnace body 1 has a wear measuring opening 53 through its inner wall for the wear measuring device 5 to extend into. The wear measuring device 5 includes an isolation protective cover 51, which covers the wear measuring opening 53 and is fixedly installed on the outer wall of the annealing furnace body 1. A hydraulic telescopic column 52 is fixedly engaged with the inner wall of the isolation protective cover 51. A semi-circular pressure plate 54 is fixedly installed at the end of the hydraulic telescopic column 52, aligned with the carbon roller 2. An elastic pressure-sensitive pad 55 is fixedly installed on the side of the semi-circular pressure plate 54 closest to the carbon roller 2, and several pressure sensors are distributed inside the elastic pressure-sensitive pad 55. A heat insulation plate 56 with a return spring is hinged to the inner wall of the annealing furnace body 1, covering the wear measuring opening 53. When not in use, the semi-circular pressure plate 54 is stored inside the isolation protective cover 51 and is not easily exposed to the outside environment. Damage affects the performance. When needed, once the internal temperature of the annealing furnace body 1 drops to room temperature, the hydraulic telescopic rod is extended, and the semi-circular pressure plate 54 will push open the insulation plate 56 through the damage testing opening 53 and enter the furnace until it moves to the designated position and touches the carbon sleeve roller 2. The pressure sensor measures the pressure feedback from various parts of the carbon sleeve roller 2. When the carbon sleeve roller 2 has no wear or low wear, the feedback pressure is evenly distributed and the pressure is within the specified range. When the feedback pressure is unevenly distributed and less than a certain threshold, it can be determined that the carbon sleeve roller 2 has reached the standard of needing replacement. The semi-circular pressure plate 54 wraps around the carbon sleeve roller 2 in pairs, which can measure the wear degree of various parts around the carbon sleeve roller 2 from all directions. When the damage testing device 5 is not in use, the insulation plate 56 will cover the damage testing opening 53 to prevent the high temperature backflow in the furnace from damaging the semi-circular pressure plate 54 and its internal electronic components, effectively improving the service life of the damage testing device 5.

[0037] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for online treatment of nodules on furnace rollers in a silicon steel annealing line, comprising a silicon steel production line, wherein the silicon steel production line is provided with an annealing furnace body (1), the annealing furnace body (1) is provided with a plurality of pairs of carbon sleeve rollers (2) along the width direction, a servo motor (3) for driving the carbon sleeve rollers (2) to rotate is fixedly provided on the outer wall of the annealing furnace, the two ends of the carbon sleeve rollers (2) are rotatably connected to and pass through the inner wall of the annealing furnace body (1), and a gas injection nozzle (11) for adjusting the furnace atmosphere is fixedly provided on the inner wall of the annealing furnace body (1), characterized in that, Includes the following steps: S1. Take a low-grade silicon steel plate (4) weighing 15-25 tons and install it into the annealing furnace body (1); S2. Adjust the gas injector (11) to stop supplying hydrogen used in the annealing process and continuously inject nitrogen into the furnace to maintain a pure nitrogen atmosphere; S3. Increase the internal temperature of the annealing furnace body (1), wherein the internal temperature is 800-950℃; S4. Start the silicon steel production line and carry out the grinding operation of carbon sleeve rollers (2). All carbon sleeve rollers (2) are kept rotating, and the pairs of carbon sleeve rollers (2) are stopped in turn and kept stationary until all carbon sleeve rollers (2) are ground. S5. After the grinding is completed, start the production line to rotate forward, adjust the atmosphere in the furnace to hydrogen, raise the internal temperature of the annealing furnace body (1) to 950-1050℃, and continue the annealing operation.

2. The method for online treatment of furnace roll nodules in a silicon steel continuous annealing line according to claim 1, characterized in that: In step S2, the gas nozzle (11) operates at a rate of 1000-1800 m³ / h. 3 Nitrogen gas is injected at a certain flow rate.

3. The method for online treatment of furnace roll nodules in a silicon steel continuous annealing line according to claim 1, characterized in that: In step S4, the grinding speed of the paired carbon rollers (2) is 10-100 m / min, and the grinding time of the paired carbon rollers (2) is 10-40 min for forward rotation and the same time for reverse rotation.

4. The method for online treatment of furnace roll nodules in a silicon steel continuous annealing line according to claim 1, characterized in that: The surface of the low-grade silicon steel plate (4) is coated with ceramic abrasive powder.

5. The method for online treatment of furnace roll nodules in a silicon steel continuous annealing line according to claim 1, characterized in that: The outer wall of the annealing furnace body (1) is fixedly provided with a wear measuring device (5) for measuring the wear degree of the carbon sleeve roller (2). The inner wall of the annealing furnace body (1) is provided with a wear measuring opening (53) for the wear measuring device (5) to extend into. The wear measuring device (5) includes an isolation protective cover (51). The isolation protective cover (51) covers the wear measuring opening (53) and is fixedly provided on the outer wall of the annealing furnace body (1). The inner wall of the isolation protective cover (51) is fixedly fitted with a hydraulic telescopic column (52). A semi-arc pressure plate (54) is fixedly provided at the end of the hydraulic telescopic column (52). The semi-arc pressure plate (54) is aligned with the carbon sleeve roller (2). An elastic pressure-sensitive pad (55) is fixedly provided on the side of the semi-arc pressure plate (54) close to the carbon sleeve roller (2). Several pressure sensors are distributed inside the elastic pressure-sensitive pad (55).

6. The method for online treatment of furnace roll nodules in a silicon steel continuous annealing line according to claim 5, characterized in that: The inner wall of the annealing furnace body (1) is hinged with a heat insulation plate (56) with a reset spring, and the heat insulation plate (56) covers the damage measurement opening (53).

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