RU2597181C1 - Heat-shielding installation above the rolling table of hot-strip mill - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to production of hot-rolled strips on wide strip mills in ferrous metallurgy. Heat-shielding installation comprises several consecutive sections with individual drive of their movement from the rolling table or to rolling table, in working position shielding cover above the roller conveyor. Sections are equipped with inclined baffles and in the installed above the roller conveyor working position are connected to each other to form above the roller conveyor continuous screening roof with a possibility of individual disconnection of the sections for their movement from the rolling table.

EFFECT: reduce of height of screening surfaces location relative to the level of the body of the rolling table, increase of efficiency of heat preservation by the semifinished rolled products and reduce of cooling of its edges.

1 cl, 4 dwg

Description

The present invention relates to the production of hot rolled strips on broadband mills (ShPS, p.) In the steel industry.

To reduce the heat loss of rolled metal from its upper surface on the ShPS of the city, heat-saving installations (screens) are used.

The heat shield of the intermediate roller table of a strip mill is known, made in the form of a series of sections of an endless tape made of heat-resistant material (see, for example, AS No. 1574303, B21B 39/00 of 08/05/1988).

The actual operating conditions of the ShPS joint intermediate roller table of the city, when, along with solving the problems of conveying the rolling stock along the live table, there is a need to service (including repair) the rolling table, as well as to remove the rolling jam stuck in the finishing group of stands, exclude the use of this heat shield on the intermediate roller table ShPS

The aforementioned led to the implementation of heat-shielding installations over the ShPs rolling table of the city in the form of a series of sections arranged in series, forming a shielding "roof" above the roller table during the movement of hot strip metal along the roller table.

Known heat-shielding installation above the intermediate roller table of a strip hot rolling mill, containing a series of successively arranged sections with an individual drive for moving them from the roller table with the possibility of removing sections from the roller table in case of industrial need and to the roller table forming a shielding roof over the roller table in the process of screening rolling, while sections equipped with chippers [see, for example, MPT International, 4/1997, p. 126 ... 130].

The disadvantages of the known heat shielding installation are:

firstly, the unsatisfactory design of the sections of the sliding impacts of the front end of the rolling moving along the roller table, which significantly reduces the overall performance of the screen sections;

secondly, the unsatisfactory perception by the design of the sections of the end impacts on them of the front end of the rolling rolling along the rolling table. These impacts occur due to the jump of the previous section of the installation upon impact of a tackle on it and, accordingly, there is a hit of the front end of the tackle at the end of the subsequent section.

The noted design flaws of the known heat-shielding installation lead to the necessity of arranging the screen sections at an altitude of about 250 mm from the level of the barrels of the intermediate roller table, which reduces the efficiency of the installation for preserving heat by hot rolling and especially its edges.

A heat-shielding installation is known above the rolling table of a hot rolling strip mill, containing a series of sections arranged in series with an individual drive for moving them from the roller table or to the roller table forming a shielding "roof" above the roller table, while the sections are equipped with inclined chippers [see, for example, A. Koryshev . "Development of a heat-preserving shielding installation for an intermediate live roll of wide-band hot rolling mills." Abstract of diss. Ph.D. M .: MISiS, 1992].

By the set of essential features, this known design of a heat shielding installation is closest to the proposed installation, therefore, taken as a prototype.

A significant disadvantage of the known heat-shielding installation is the destruction of the section structures due to the already noted end impacts of the front end of the rolling moving along the rolling table. Destruction occurs due to the rise (including a jump) of the previous installation section during a sliding tackle strike on inclined chippers, as a result, the front end of the tackle hits the end of the subsequent section.

In aggregate, this drawback eliminates the lowering of the screening surfaces of the sections below 250 mm from the level of the barrels of the roller table rollers, which significantly reduces the effective use of the heat shielding unit to reduce cooling of the hot roll and especially cooling of its side edges.

The proposed heat-shielding installation over the rolling table of a strip hot rolling mill is free of this drawback. It eliminated the possibility of hitting the end of the installation sections of the front end of the rolling moving along the rolling table. Thus, conditions have been created that allow the shielding sections to be lowered significantly below 250 mm (up to 100 mm) from the level of the rolls of barrels and on this basis to increase the effect of heat preservation by hot rolling, especially its lateral edges. On this basis, to reduce the energy and power parameters of rolling in finishing stands, to improve the rollability of the strip edges, to reduce wear of the work rolls in contact with the edge sections of the roll. In addition, metal losses due to cracking of the side edges during subsequent cold rolling are reduced.

The above technical results are achieved due to the fact that in a heat shielding installation above the roller table of a hot rolling strip mill, comprising a series of successively arranged sections with an individual drive for moving them from the roller table or to the roller table, forming a shielding roof over the roller table and equipped with inclined chippers, according to the invention, installed above sections with a rolling table are rigidly connected to each other by means of rods with the side of the sections located on the outside of the roller table odes of horizontal movement of the rods, with the possibility of separation of the sections for their individual movement from the roller table or to the roller table.

The heat shielding installation over the roller table of a strip hot rolling mill is illustrated by the drawings in FIG. 1-4. In FIG. 1 sections of a heat shielding unit are shown inoperative when they are individually retracted from the roller table. In FIG. 2 shows a side view of a section of the roller table with a series of sections arranged successively above it in their working position, rigidly connected to each other; in FIG. 3 is a top view of a portion of the roller table with a series of sections successively connected above it in a working position and connected rigidly to each other and forming a screening roof; in FIG. 4 is a preferred embodiment of a rigid connection sections in their working position.

On the rolling table 1 of a strip hot rolling mill, a heat-shielding installation is used, made in the form of successive sections 2 with screens 3 mounted on them (Fig. 1). Section 2 is equipped with inclined chippers 4 (Fig. 1 and 2). Each section is equipped with a drive 5 (for example, a hydraulic cylinder or a pneumatic cylinder) for their individual movement by turning to the roller table or from the roller table. Sections 2 of the heat-shielding installation by moving from the drive 5 can occupy idle (Fig. 1) and working (Fig. 2 and 3) positions relative to the roller table 1. In the working position (Fig. 2 and 3), the screens 3 of sections 2 form a shielding roof over the roller table 1 (surface) 6. In this case, in the operating position, the sections are rigidly connected to each other by means of rods 7 located on the side of the sections external to the roller table and equipped with a drive for their horizontal movement 8 (Fig. 2-4). The drive 8 of the movement of the rods 7 is also located on the side 1 of the sections 2, external from the roller table (preferably pneumatic cylinders, taking into account the relatively high temperature conditions in the operating area of the drive; a drive from a gear motor is possible). An integral part of the heat-shielding installation is the input device 9, which provides the bending of the front end of the roll 10 (PC in Fig. 2).

The heat-shielding installation above the roller table of a strip hot rolling mill provides a reduction in heat loss by the upper surface of the roll 10 due to the shielding roof (surface) 6 and works as follows.

To reduce heat loss by the upper surface of the roll 10 of section 2 of the heat-shielding installation, the drive 5 is transferred from the idle position (Fig. 1) to the working position (Fig. 2 and 3), forming in the working position a shielding roof (surface) 6. The shielding roof 6 is formed by connecting individual sections between themselves using rods 7 from the drive 8 (Fig. 4). The front end of the roll 10 (PC in Fig. 2) during the movement of the roll (see arrow in Fig. 2) bends along the rolling table 1 to the rolling table 1, passing the input device 9. In the subsequent movement along the live table, the rolled PC can hit the inclined chippers 4 sections 2 (Fig. 2). Due to the connection of the sections 2 marked by the rods 7, the impact of the rolling PC on the inclined chippers 4 does not lead to the bouncing of the corresponding section. In addition, due to the execution of the bumpers 4 inclined, the PC slides along these bumpers of the sections, which together with the marked connection of the sections with rods 7 eliminates the impact of the PC of the tackle at the end of the next section in the direction of its movement.

The marked design of the heat-shielding installation above the roller table of the strip hot rolling mill allows to reduce the distance h (Fig. 2) between the screening roof (surface) 6 and the level of the barrels of the roller table rollers 1. In addition, this position is ensured due to the ratio h ₁ <h, where the distance h ₁ form when passing the PC tackle 10 through the input device 9 (Fig. 1).

With respect to wide-band hot rolling mills, designed for the use of rolling stock 10 with a thickness of up to 50 mm, a distance h is taken, for example, equal to 100 mm in comparison with 250 mm in a known installation. This reduces heat loss by the upper surface of the rolled 10 and, most importantly, reduces the cooling of the edges of the rolled. The effectiveness of the proposed technical solution is enhanced by the use of a known shielding of the bottom surface of the tackle in the installation by using air scale filling the cavities in the inter-roller plates when the distance between the upper level of the scale and the lower surface of the tackle does not exceed 50 mm.

If for technical reasons it is necessary to raise one (or several) sections 2 into an inoperative position, the rods 7 of the sections to be lifted from the connection are removed by a drive 8.

Together, the use of this technical solution along with an additional decrease in cooling of the tackle significantly improves the quality of the edges of the finished hot-rolled strips due to less cooling of the edges. The latter is especially important when rolling in a wide strip mill.

Claims (1)

A heat-shielding installation of the rolling table of a hot rolling strip mill, comprising a series of sections arranged individually with an individual drive to move them from the rolling table or to the rolling table, forming a shielding roof in a position mounted above the roller table and provided with inclined chippers, characterized in that the sections are rigidly connected to each other in the position installed above the roller table with the other by means of rods with the horizontal movement of the rods located on the outside of the roller table side of the sections with POSSIBILITY disconnection of individual sections for movement of the roller conveyor or roller conveyor.

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