阅读说明：本技术 避免炉底辊辊面异物粘附的方法及避免氧化铁皮粘附的装置 (Method for preventing foreign matter from adhering to roller surface of hearth roller and device for preventing iron scale from adhering ) 是由 郑刚平 朱久平 于 2020-06-17 设计创作，主要内容包括：本发明公开了一种避免炉底辊辊面异物粘附的方法及避免氧化铁皮粘附的装置,其特点是包括如下步骤：A.炉底辊辊面粘附异物类型的识别,所述粘附异物的类型包括焊渣结瘤和氧化铁皮；B.焊渣结瘤的处理：对钢卷焊接的焊缝进行抛光修磨处理；C.氧化铁皮的处理：调整退火炉膛氧含量,减少氧化铁皮脱落量；炉底辊冷却水回水温度控制在40℃以下。本发明的有益效果是简单易行,控制元素简单,易于调节,能够避免炉底辊异物粘附的产生,有效地降低了炉底辊压入的发生,提高机组作业率。(The invention discloses a method for avoiding the adhesion of foreign matters on the roller surface of a hearth roller and a device for avoiding the adhesion of iron scales, which are characterized by comprising the following steps of: A. identifying the type of foreign matters adhered to the roller surface of the hearth roller, wherein the type of the foreign matters adhered to the roller surface comprises welding slag nodulation and iron scale; B. and (3) treatment of welding slag nodulation: polishing and grinding the welding seam welded on the steel coil; C. treating iron scale: adjusting the oxygen content of the annealing furnace to reduce the falling amount of iron scales; the return water temperature of the cooling water of the hearth roll is controlled below 40 ℃. The invention has the advantages of simplicity, easy implementation, simple control elements and easy adjustment, can avoid the generation of the adhesion of foreign matters on the hearth roller, effectively reduces the occurrence of the pressing-in of the hearth roller and improves the operation rate of a unit.)

1. A method for avoiding the adhesion of foreign matters on the roller surface of a hearth roller is characterized by comprising the following steps:

A. identifying the type of foreign matters adhered to the roller surface of the hearth roller, wherein the type of the foreign matters adhered to the roller surface comprises welding slag nodulation and iron scale;

B. and (3) treatment of welding slag nodulation: polishing and grinding the welding seam welded on the steel coil;

C. treating iron scale: adjusting the oxygen content of the annealing furnace to reduce the falling amount of iron scales; the return water temperature of the cooling water of the hearth roll is controlled below 40 ℃.

2. The method for preventing the foreign matters from adhering to the roller surface of the hearth roller according to claim 1, wherein the method comprises the following steps: and C, in the step C, in order to realize the return water temperature of the cooling water of the hearth roll below 40 ℃, the inlet water temperature of the cooling water of the hearth roll is controlled to be 15-25 ℃.

3. The method for preventing the adhesion of foreign matters on the roller surface of the hearth roller according to claim 1 or 2, wherein: and the cooling water adopted in the step C is industrial water.

4. The method for preventing the adhesion of foreign matters on the roller surface of the hearth roller according to claim 1 or 2, wherein: and step C, controlling the return water temperature of the cooling water of the hearth roller to be below 40 ℃ by adopting a device for avoiding the adhesion of iron scales on the roller surface of the hearth roller of the annealing furnace, wherein the device comprises the hearth roller, a water circulation tank, an industrial water refrigerator and a water supply pump, the hearth roller is provided with an input end and an output end, and the output end, the water circulation tank, the industrial water refrigerator, the water supply pump and the input end are sequentially connected by a pipeline.

5. The method for preventing the foreign matters from adhering to the roller surface of the hearth roller according to claim 4, wherein the method comprises the following steps: the temperature of the cooling water from the industrial water refrigerating machine to the input end is 15-25 ℃.

6. The method for preventing the foreign matters from adhering to the roller surface of the hearth roller according to claim 4, wherein the method comprises the following steps: the device for preventing the iron scale on the roller surface of the bottom roller of the annealing furnace from adhering adopts industrial water as cooling water.

7. The utility model provides an avoid device of stove bottom roller roll surface iron scale adhesion, includes the stove bottom roller, set up input and output on the stove bottom roller, its characterized in that: the water circulation system is characterized by further comprising a water circulation tank, an industrial water refrigerator and a water supply pump, wherein the output end, the water circulation tank, the industrial water refrigerator, the water supply pump and the input end are sequentially connected through pipelines.

8. The apparatus for preventing the scale from adhering to the roll surface of a hearth roll according to claim 7, wherein: the cooling medium in the device for preventing the iron scale on the roller surface of the bottom roller of the annealing furnace from being adhered is industrial water.

9. The apparatus for preventing the adhesion of oxide scale on the surface of a hearth roll according to claim 7 or 8, wherein: the temperature of the cooling water from the industrial water refrigerating machine to the input end is 15-25 ℃.

10. An annealing furnace characterized by comprising an apparatus for preventing the adhesion of oxide scale on the surface of a hearth roll according to any one of claims 1 to 9.

Technical Field

The invention belongs to the technical field of stainless steel heat treatment, and particularly relates to a method for avoiding pressing defects of foreign matters adhered to a hearth roller and a device for avoiding iron scale adhesion in a heat treatment process of a thermal annealing and pickling engineering steel strip.

Technical Field

The stainless steel annealing heat treatment process is generally divided into discontinuous annealing and continuous annealing, wherein the discontinuous annealing means that a stainless steel coil finishes annealing heat treatment in a discontinuous annealing furnace (namely a bell-type furnace), the layout of the bell-type annealing furnace is independent, and the annealing operation can be carried out by adopting hydrogen medium reduction or hydrogen-free reduction. The continuous annealing refers to the purpose that the steel coil passes through a continuous horizontal annealing furnace in a belt-shaped manner at a constant speed after being flattened so as to achieve the annealing. The steel strip supporting roll matched with the annealing furnace is usually made of ceramic fiber rolls and steel rolls, and indirect cooling water is arranged in a roll core of the furnace bottom roll and used for cooling a furnace bottom roll body. The Chinese patent application, application number CN201020670180.1, application date 2010.12.20, grant publication number CN201999964U, grant publication date 2011.10.05, disclose a hearth roll cooling water circulation system, which comprises a hearth roll and a cooling tower, and is characterized in that the input end of the hearth roll is in conduction connection with the output end of the cooling tower through a first pipeline, a water storage tank is arranged below the output end of the hearth roll, and the water storage tank is in conduction connection with the input end of the cooling tower through a second pipeline; the outlet pressure of the hearth roll in the water circulation system is 0, the pressure difference between the cooling water inlet and the cooling water outlet is increased, so that the cooling water can smoothly circulate in the hearth roll, the phenomenon that the pipeline is blocked by scale is avoided, and the outlet pressure is 0, so that the water leakage phenomenon can not occur at the outlet, and the corrosion damage phenomenon of elements such as bearings is greatly reduced; meanwhile, the hearth roll is not broken due to overheating deformation. In actual production, because the steel band is in close contact with the bottom roller of the annealing furnace in a high-temperature atmosphere, and the steel band has large sag, foreign matters are easily adhered to the bottom roller after the bottom roller is pressed and abraded, and the foreign matters are pressed into the surface of the steel band to influence the surface quality of the steel band.

Disclosure of Invention

1. Technical problem to be solved

Aiming at solving the problem that the adhesion of the iron scale foreign matters on the roller surface of the bottom roller of the annealing furnace in the prior art is not good, the invention aims to provide the method for avoiding the adhesion of the foreign matters on the roller surface of the bottom roller of the annealing furnace and the device for avoiding the adhesion of the iron scale, which are simple and feasible, have simple control elements and easy adjustment, can avoid the adhesion of the foreign matters on the bottom roller of the furnace, effectively reduce the press-in of the bottom roller of the furnace, improve the operation rate of a unit and reduce the resource consumption.

2. Technical scheme

In order to overcome the defects of the prior art, the invention adopts the following technical scheme:

a method for avoiding the adhesion of foreign matters on the roller surface of a hearth roller is characterized by comprising the following steps:

A. identifying the type of foreign matters adhered to the roller surface of the hearth roller, wherein the type of the foreign matters adhered to the roller surface comprises welding slag nodulation and iron scale;

B. and (3) treatment of welding slag nodulation: polishing and grinding the welding seam welded on the steel coil;

C. treating iron scale: adjusting the oxygen content of the annealing furnace to reduce the falling amount of iron scales; the return water temperature of the cooling water of the hearth roll is controlled below 40 ℃.

In a specific embodiment of the invention, in the step C, in order to realize that the return water temperature of the cooling water of the hearth roll is below 40 ℃, the inlet water temperature of the cooling water of the hearth roll is controlled to be 15-25 ℃.

In a specific embodiment of the present invention, the cooling water used in step C is industrial water.

In a specific embodiment of the invention, the step C adopts a device for avoiding the adhesion of iron scale on the roller surface of the hearth roller of the annealing furnace to control the temperature of the cooling water return water of the hearth roller to be below 40 ℃, the device comprises the hearth roller, a water circulation tank, an industrial water refrigerator and a water supply pump, the hearth roller is provided with an input end and an output end, and the output end, the water circulation tank, the industrial water refrigerator, the water supply pump and the input end are sequentially connected through pipelines.

In a specific embodiment of the invention, the temperature of the cooling water from the industrial water refrigerator to the input end is 15-25 ℃.

The device is characterized by further comprising a water circulation tank, an industrial water refrigerator and a water supply pump, wherein the output end, the water circulation tank, the industrial water refrigerator, the water supply pump and the input end are sequentially connected through pipelines.

In a specific embodiment of the invention, the cooling medium in the device for avoiding the iron scale adhesion on the roller surface of the bottom roller of the annealing furnace is industrial water.

In a specific embodiment of the invention, the temperature of the cooling water from the industrial water refrigerator to the input end is 15-25 ℃.

The invention also aims to provide an annealing furnace which is characterized by comprising the device for preventing the scale on the roller surface of the hearth roller from adhering.

Based on comprehensive consideration of yield, quality and cost, technicians analyze the generation mechanism of the foreign matter adhesion of the hearth roll, and researches show that the foreign matter adhesion on the surface of the hearth roll is mainly divided into two types through on-site material object comparison and tests: scale and dross nodulation. The formation of the weld nugget is required to weld the front and rear strip steels in order to achieve continuous annealing of the strip steels. The welding slag nodulation can be eliminated by polishing and coping the welding seam at the welding position of the steel coil. The problem of the falling of the iron scale part on a furnace bottom roller can be solved by adjusting the oxygen content of the annealing furnace chamber for the iron scale, but the problem that the iron scale is adhered to the roller surface can not be solved. Through the cause of iron scale adhesion on the roller surface of the hearth roller, the defect probability that roller marks are formed due to the fact that the iron scale adhesion occurs on the surface of the hearth roller at the hearth roller cooling water return temperature of 45-60 ℃ is increased, and the roller surface iron scale adhesion hardly occurs when the hearth roller cooling water return temperature is lower than 40 ℃. Therefore, the problem that iron scales are adhered to the surface of the hearth roll is solved, and the temperature of cooling water of the hearth roll is reduced. In the prior art, cooling water of a furnace bottom roller is provided by a drinking water pool, the indirect circulating cooling is realized, cooling water return water is radiated by a cooling fan at the top of the water pool, the temperature is reduced by about 10 ℃, and the temperature difference space between inlet water and outlet water of the cooling water is limited.

3. Advantageous effects

Compared with the prior art, the invention has the beneficial effects that: the invention improves the original annealing furnace bottom roller cooling process design, changes the cooling water from the heat dissipation of the drinking water pool cooling fan to the cooling of the industrial water refrigerator, supplies the refrigeration industrial water to the annealing furnace bottom roller, has low investment cost, simple and easy operation, simple control elements and easy adjustment, can avoid the generation of the adhesion of foreign matters on the furnace bottom roller, effectively reduces the occurrence of the furnace bottom roller pressing-in, improves the operation rate of a machine set, has obvious improvement result, and completely solves the bottleneck of the furnace bottom roller pressing-in the years.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic diagram of the present invention.

In the figure: 1-hearth roll 2-input end 3-output end 4-water circulation tank 5-industrial water refrigerator 6-water supply pump.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, not all embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the invention.

In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, a method for preventing the adhesion of foreign matters on the surface of a hearth roll comprises the following steps:

A. identifying the type of foreign matters adhered to the roller surface of the hearth roller 1, wherein the type of the foreign matters adhered comprises welding slag nodulation and iron scale;

B. and (3) treatment of welding slag nodulation: polishing and grinding the welding seam welded on the steel coil;

C. treating iron scale: adjusting the oxygen content of the annealing furnace to reduce the falling amount of iron scales; the return water temperature of the cooling water of the hearth roll 1 is controlled below 40 ℃.

And C, in the treatment of the iron scale in the step C, in order to realize that the return water temperature of the cooling water of the hearth roller 1 is below 40 ℃, the inlet water temperature of the cooling water of the hearth roller 1 is controlled to be 15-25 ℃.

And C, adopting industrial water as cooling water.

And step C, controlling the return water temperature of cooling water of the hearth roller 1 to be below 40 ℃ by adopting a device for avoiding the adhesion of iron scales on the roller surface of the hearth roller of the annealing furnace, wherein the device comprises the hearth roller 1, a water circulation tank 4, an industrial water refrigerator 5 and a water supply pump 6, an input end 2 and an output end 3 are arranged on the hearth roller 1, and the output end 3, the water circulation tank 4, the industrial water refrigerator 5, the water supply pump 6 and the input end 2 are sequentially connected through pipelines.

The temperature of the cooling water from the industrial water refrigerator 5 to the input end 2 is 15-25 ℃.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.