阅读说明：本技术 一种防止保温罩内钢卷表面氧化的露点方法 (Dew point method for preventing surface oxidation of steel coil in heat-insulating cover ) 是由 曾龙华 陈勇 徐嘉春 李�杰 贾伟 张晓健 于 2018-06-19 设计创作，主要内容包括：本发明公开了一种防止保温罩内钢卷表面氧化的露点方法,其特征是,在热卷轧制、卷取、打捆后,通过钢卷运输链或移动小车将钢卷直接移送至冷轧机组,在上述钢卷运输过程中,采用保温罩对钢卷做在线保温处理,利用热卷余热直接完成退火调质；保温罩设排气孔及相应的控制阀；保温罩为复合结构,采用保温材料做夹层。(The invention discloses a dew point method for preventing the surface oxidation of a steel coil in a heat-insulating cover, which is characterized in that after hot coil rolling, coiling and bundling, the steel coil is directly transferred to a cold rolling unit by a steel coil conveying chain or a moving trolley, in the steel coil conveying process, the heat-insulating cover is adopted to carry out on-line heat-insulating treatment on the steel coil, and the annealing tempering is directly finished by utilizing the waste heat of the hot coil; the heat-insulating cover is provided with an exhaust hole and a corresponding control valve; the heat-insulating cover is of a composite structure and adopts heat-insulating materials as interlayers.)

1. A dew point method for preventing the surface oxidation of a steel coil in a heat-insulating cover is characterized in that after hot coil rolling, coiling and bundling, the steel coil is directly transferred to a cold rolling unit through a steel coil conveying chain or a moving trolley, in the steel coil conveying process, the heat-insulating cover is adopted to carry out on-line heat-insulating treatment on the steel coil, and the annealing and tempering are directly completed by utilizing the waste heat of the hot coil; the heat-insulating cover is provided with an exhaust hole and a corresponding control valve; the heat-insulating cover is of a composite structure, and a heat-insulating material is used as an interlayer; and the steel coil enters the heat-insulating cover, and the exhaust hole control valve is opened for more than 1 hour.

2. The dew point method of preventing oxidation of a surface of a steel coil within an insulated enclosure of claim 1, wherein said moving cart comprises,

a base plate;

the steel coil fixing seat is arranged in the center of the bottom plate;

the tray is of an annular structure and is horizontally sleeved in the middle of the steel coil fixing seat;

the lower end of the heat-preservation cover is provided with an opening, the heat-preservation cover covers the tray, and the volume of the inner cavity of the heat-preservation cover is larger than that of the steel coil;

and a plurality of exhaust holes and corresponding control valves are arranged on the heat-insulating cover.

3. The dew point method of preventing oxidation of a surface of a steel coil within an insulated enclosure of claim 1, wherein said moving cart comprises,

a tray;

the steel coil fixing seat is arranged in the center of the tray;

the lower end of the heat-preservation cover is provided with an opening, the heat-preservation cover covers the tray, and the volume of the inner cavity of the heat-preservation cover is larger than that of the steel coil;

and a plurality of exhaust holes and corresponding control valves are arranged on the heat-insulating cover.

4. The dew point method for preventing the surface oxidation of the steel coil in the heat preservation cover as claimed in claim 1, 2 or 3, wherein the heat preservation cover is a composite structure, the outer protection layer is a high-strength steel plate, the middle layer is a heat preservation material, and the inner layer is a high temperature resistant stainless steel plate.

5. The dew point method of claim 3, wherein the vent hole is formed in an outer protective layer of the heat-insulating cover.

Technical Field

The invention relates to a hot rolling process, in particular to a dew point method for preventing the surface of a steel coil in a heat-insulating cover from being oxidized.

Background

A heat-insulating cover device for hot coil is a heat-insulating slow-cooling device developed for improving steel types such as cold and hot-rolled high-strength steel, adopts a totally-enclosed sealing mode for ensuring heat-insulating effect, but has good heat-insulating and sealing effects in the implementation process, and the surface of a steel coil can be seriously oxidized, so that the surface oxide scales of the steel coil of an inner ring and an outer ring drop, the surface quality of the steel coil is damaged, and the use of post-process production and users is influenced.

Conventionally, non-oxidizing gases such as nitrogen are used to prevent oxidation in order to control oxidation. As the prior art is filled with non-oxidizing gases such as nitrogen and the like, the process cost is high and the flow is complex.

Disclosure of Invention

The invention aims to provide a dew point method for preventing the surface oxidation of a steel coil in a heat-insulating cover, which is different from the traditional method of filling non-oxidizing gas to control the oxidation, and adopts the technical scheme that the inside and the outside of a heat-insulating cover device are provided with exhaust holes and heat-insulating materials are sandwiched between the exhaust holes and the heat-insulating materials, so that the surface oxidation of the steel coil is simply and efficiently controlled.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a dew point method for preventing the surface oxidation of a steel coil in a heat-insulating cover is characterized in that after hot coil rolling, coiling and bundling, the steel coil is directly transferred to a cold rolling unit through a steel coil conveying chain or a moving trolley, in the steel coil conveying process, the heat-insulating cover is adopted to carry out on-line heat-insulating treatment on the steel coil, and the annealing and tempering are directly completed by utilizing the waste heat of the hot coil; the heat-insulating cover is provided with an exhaust hole and a corresponding control valve; the heat-insulating cover is of a composite structure, and a heat-insulating material is used as an interlayer; and the steel coil enters the heat-insulating cover, and the exhaust hole control valve is opened for more than 1 hour.

Further, the mobile trolley comprises a bottom plate; the steel coil fixing seat is arranged in the center of the bottom plate; the tray is of an annular structure and is horizontally sleeved in the middle of the steel coil fixing seat; the lower end of the heat-preservation cover is provided with an opening, the heat-preservation cover covers the tray, and the volume of the inner cavity of the heat-preservation cover is larger than that of the steel coil; and a plurality of exhaust holes and corresponding control valves are arranged on the heat-insulating cover.

The movable trolley comprises a tray; the steel coil fixing seat is arranged in the center of the tray; the lower end of the heat-preservation cover is provided with an opening, the heat-preservation cover covers the tray, and the volume of the inner cavity of the heat-preservation cover is larger than that of the steel coil; and a plurality of exhaust holes and corresponding control valves are arranged on the heat-insulating cover.

Preferably, the heat-insulating cover is of a composite structure, the outer protective layer is a high-strength steel plate, the middle layer is a heat-insulating material, and the inner layer is a high-temperature-resistant stainless steel plate. The middle of the steel coil is provided with a heat insulation material as an interlayer, so that the heat insulation effect of the steel coil is ensured.

Preferably, the exhaust hole is arranged on an outer protection layer of the heat preservation cover.

The steel coil is insulated in the insulation cover, and because the insulation cover has good sealing performance and high temperature, oxygen in the insulation cover is mainly contacted with the surface of the outer ring of the steel coil, and the surface of the outer ring of the steel coil is fully oxidized after long-time insulation, so that iron sheets on the surface of the steel coil drop.

After the steel coil enters the heat-insulating cover, the control valve is opened to open the exhaust holes of the heat-insulating cover, the opening time is longer than 1 hour, and the water vapor of the heat-insulating cover is fully discharged. The outer ring of the steel coil is convected with the outside air through the exhaust holes, the local hot air contacted with the outer ring is discharged, the overhigh surface temperature oxidation of the outer ring of the steel coil of the heat preservation cover is prevented, and the control valve is closed to carry out closed heat preservation after the integral temperature of the steel coil is uniform after 1 hour.

The invention has the beneficial effects that:

1. the technical scheme is simple and efficient.

2. The control method has a good control effect on the oxidation control of the surface of the steel coil in the heat-insulating cover.

3. The heat preservation effect is ensured.

Drawings

Fig. 1 is a schematic structural diagram 1 of a mobile cart according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram 2 of a mobile cart according to an embodiment of the present invention.

FIG. 3 is a schematic structural view of a heat-insulating cover according to an embodiment of the present invention.

Detailed Description

According to the dew point method for preventing the surface of the steel coil in the heat-insulating cover from being oxidized, after hot coil rolling, coiling and bundling, the steel coil is directly transferred to a cold rolling unit through a steel coil conveying chain or a moving trolley, in the steel coil conveying process, the heat-insulating cover is adopted to carry out online heat-insulating treatment on the steel coil, and annealing and tempering are directly completed by utilizing the waste heat of the hot coil; the heat-insulating cover is provided with an exhaust hole and a corresponding control valve; the heat-insulating cover is of a composite structure, and a heat-insulating material is used as an interlayer; and the steel coil enters the heat-insulating cover, and the exhaust hole control valve is opened for more than 1 hour.

Referring to fig. 1 and 2, the mobile cart of the present invention comprises,

a base plate 1;

the steel coil fixing seat 2 is arranged in the center of the bottom plate 1;

the tray 3 is of an annular structure and is horizontally sleeved in the middle of the steel coil fixing seat 2;

the lower end of the heat-insulating cover 4 is opened and covers the tray 3, and the volume of the inner cavity of the heat-insulating cover is larger than that of the steel coil 100; the heat preservation cover 4 is provided with an exhaust hole and a corresponding control valve 41.

Referring to fig. 3, the traveling carriage of the present invention, which includes,

the bottom surface of the tray 3 is provided with two guide rails which are matched with the roller way conveying chain in parallel;

the steel coil fixing seat 2 is arranged on the tray 3;

the heat preservation cover 4 is covered outside the steel coil fixing seats 2, the volume of the inner cavity of the heat preservation cover is larger than the volume of at least one steel coil 100+ one steel coil fixing seat 2, and the lower end of the heat preservation cover 4 is movably connected to the tray 3; the heat preservation cover 4 is provided with a plurality of exhaust holes and corresponding control valves 41.

Preferably, the heat-insulating cover 4 is of a composite structure, the outer protective layer is a high-strength steel plate, the middle layer is a heat-insulating material, and the inner layer is a high-temperature-resistant stainless steel plate.

Preferably, the exhaust hole is arranged on an outer protection layer of the heat preservation cover.

After the steel coil enters the heat-insulating cover, the control valve is opened to open the exhaust holes of the heat-insulating cover, the opening time is longer than 1 hour, and the water vapor of the heat-insulating cover is fully discharged. The outer ring of the steel coil is convected with the outside air through the exhaust holes, the local hot air contacted with the outer ring is discharged, the overhigh surface temperature oxidation of the outer ring of the steel coil of the heat preservation cover is prevented, and the control valve is closed to carry out closed heat preservation after the integral temperature of the steel coil is uniform after 1 hour.