RU55649U1 - TABLE ROLLER - Google Patents

Abstract

The utility model relates to rolling production, in particular, to the equipment of hot-rolled sheet mills. The main goal solved by the utility model is to increase the productivity of plate mills and reduce labor costs. The proposed roller table contains rollers with an individual drive, sequentially installed during rolling at distances from each other in the sidewalls, and the roller table additionally contains two conical rollers mounted with the possibility of mutually opposite rotation, the ends of the barrels of the same name of different diameters, while on the ends of the barrels of all the rollers live rolls made circular grooves; the taper of the barrels is 0.01, and these rollers are removed from the working stand of the mill at a distance equal to 0.55 ... 0.60 of the maximum length of the roll; the width of the circular grooves can be 0.09 ... 0.11 of the average barrel diameter D ', their depth is (0.20 ... 0.24) D' and they are located at a distance of (0.28 ... 0, 32) D 'from the axis of the roller.

Description

The utility model relates to rolling production and can be used in the manufacture of thick hot-rolled sheets.

One of the obligatory elements of rolling mills (including plate mills) are transporting roller tables, in particular, discharge conveyors located behind the last mill stand and serving for moving finished profiles or sheets to packaging (packing) devices. Most often, live rolls contain cylindrical drive rollers.

The main design features of the existing roller tables are described, for example, in the reference manual, under the editorship of E.S. Rokotyan “Rolling production”, t.1, M., “Metallurgizdat”, 1962, p. 291-294.

A device is known for transporting sheets of a rolling mill, comprising rollers with plastic disks with ring magnets between them (see Pat. Czechoslovakia Patent No. 108261, class B 21 V, dated August 15, 63), which prevents the sheets from being swollen and slipping. However, the device is unsuitable for hot rolling mills, for example, thick sheets.

The closest analogue to the claimed device is a transport roller table described in the book by A. A. Korolev “Mechanical equipment of rolling and pipe shops”, 1987, p. 195-196, Fig. V.6.

This rolling table for transportation of rolled products (including thick sheets) contains rollers with an individual drive, sequentially installed at a distance from each other and is characterized in that the rollers are hollow and end hubs are welded to their ends, mounted on the shaft.

A disadvantage of the known roller table is the inability to rotate the roll 90 ° in the horizontal plane without the use of additional devices or mechanisms.

This rotation on plate mills is carried out to "break" the width of the roll (ie rolling it in the transverse direction in order to increase the width of the rolling) with a new passage through the stand. Then, after broadening the roll, it is again rotated 90 °, continuing longitudinal rolling. The use of special devices for such an operation reduces the pace of rolling, which reduces the productivity of the mill, and also leads to additional labor costs.

The technical task of the proposed utility model is to increase the performance of plate mills and reduce labor costs.

To solve this problem, the inventive roller table contains rollers with an individual drive, sequentially mounted in the sidewalls at a distance from each other, and additionally contains two conical rollers mounted with the possibility of mutually opposite rotation, the same ends of the barrels of which are of different diameters, while at the ends of the barrels of all roller table rollers are made circular grooves. The taper of the roll barrels is 0.01, the cone rollers are removed from the mill stand by a distance equal to 0.55 ... 0.60 of the maximum length of the roll; the width of the circular grooves can be 0.09 ... 0.11 of the average barrel diameter D ', their depth is (0.20 ... 0.24) D' and they are located at a distance of (0.28 ... 0, 32) D 'from the axis of the roller.

The given ratios of the roller table parameters were obtained experimentally and are empirical.

The essence of the claimed technical solution is to create the possibility of a roll of the roll directly by the roller table itself, to optimize the conicity of the barrels of conical rollers and their distance from the working stand, as well as the presence of special grooves on the ends of all the rollers, which make it possible to reduce the length of all the rollers.

Indeed, one of the crucial operations of making rollers is grinding their trunnions mounted in bearings. At the same time, the fastening elements of the grinding wheel protrude beyond its ends for a certain distance, which in the absence of these circular grooves at the roller makes

increase the trunnion length while increasing the diameter of the roller. This not only increases the dimensions of the roller table (its width), but also leads to an increase in the metal consumption of the rollers, increasing labor costs.

The presence of circular grooves allows the elements of the grinding wheel to "go" beyond the ends of the roller (it rotates when grinding).

The proposed roller table (part of it) is schematically shown in figure 1, and a tapered roller in figure 2 (drive rollers not shown).

Behind the working stand 1, a working live roll is located, the rollers 2 and 3 of which are installed in the sidewalls 4 and at a distance l from each other (arrow is the direction of movement of the roll coming out of the stand). Two rollers 3 are conical and removed from the edge 5 of stand 1 to a distance L = (0.55 ... 0.60) l _max , where l _max is the maximum length of the roll. The taper of the barrel 6 of the roller 3 (see figure 2) is equal to: (Dd): 2l _p = 1: 100 = 0.01, where D and d are, respectively, the larger and smaller diameters of the barrel, l _p is its length.

Tapered rollers are mounted with the possibility of mutually opposite rotation, and their ends with diameters D and d are located on the same (i.e. left or right) sides of the barrels.

At both ends of all the rollers of the roller table, circular grooves 7 are made, located at a distance l _k = (0.28 ... 0.32) × D '(D' is the average diameter of the barrel; for a conical roller D '= (D + d) : 2) from their axis XX. The width of these grooves is b _k = (0.09 ... 0.11) D ', and their depth ћ _k = (0.20 ... 0.24) D'. On the edges of the rollers - trunnions 8.

When rolling with a “breakdown” of the width of the roll, it is stopped on tapered rollers so that the middle of its length approximately coincides with the middle of the distance l between the rollers. Since the roll simultaneously touches only the edges of the barrels of conical rollers with a diameter D, then when the rolls are mutually opposite, the roll turns around and sets it perpendicular to the longitudinal axis of the roller table. Then all the rollers are rotated in one direction and the roll is fed into the mill stand. After rolling, the finished sheet is transported along the rolling table in the direction of the arrow (see Fig. 1).

An experimental verification of the proposed roller table was carried out at the plate mill 4500 of OJSC Magnitogorsk Iron and Steel Works.

For this purpose, when rolling sheets of various sizes, the parameters of the working rolling table of the mill and its rollers were varied. The best results (maximum mill productivity at the lowest labor costs) were obtained using the inventive facility. Deviations from the recommended parameters worsened the achieved indicators.

So, with the conicity of the roll barrels less than 0.01, there were cases of “under-rotation” of the roll to 90 °, and with the taper more than 0.01 it was unacceptable to reduce the value of d (the edge of the barrel of the rollers with the diameter of the barrels of all the rollers), which in some cases removed the rollers from system. When L <0.55l _max (see Fig. 1), the sheets of the greatest length abut against the edge 5 of stand 1, which made them impossible to turn, and L> 0.6l _max increased the total length of the roller table, which reduced the productivity of the mill.

The minimum dimensions b _k and ћ _{k of the} circular end grooves (see FIG. 2), as well as the value of l _{o are} determined by the dimensions of the fastening elements of the grinding wheel (and their vibration during grinding). At b _a> 0,11D 'and l _to> 0,32D' occurred weakening in rollers, leading to frequent replacement of rollers, which reduced productivity of the mill due to downtime for repairs.

Thus, the experiments confirmed the acceptability of the technical solution found to achieve the task.

Technical and economic studies conducted at the plant showed that the use of the proposed working roller table at mill 4500 will increase the productivity of the mill by at least 3% while reducing labor costs by approximately 10%.

Concrete example

The roll of the plate mill has the form shown in figure 1, and its rollers in figure 2.

Device Parameters:

l = 0.9 m; L = 0.57l _max = 0.57 * 9 m≈5.1 m; l _p = 3500 mm; D = 735 mm; d = 665 mm, i.e. taper - (Dd); 2l _p = (735-665): 2 × 3500-0.01;

D '= (D + d): 2 = (735 + 665): 2 = 700 mm;

b _to = 0.1D '= 0.1 × 700 = 70 mm;

ћ _k = 0.22D '= 0.22 × 700 = 154 mm;

l _k = 0.3D '= 0.3 × 700 = 210 mm.

Claims (4)

1. The working roller table of the plate mill, containing rollers with an individual drive, sequentially installed in the sidewalls at a distance from each other, characterized in that the roller table further comprises two conical rollers mounted with the possibility of mutually opposite rotation, the ends of the same name barrels of which are of different diameters, while at the ends of the barrels of all the rollers of the roller table, circular grooves are made. 2. Roller according to claim 1, characterized in that the taper of the barrels of the conical rollers is 0.01. 3. Roller according to claim 1, characterized in that the conical rollers are removed from the working stand of the mill at a distance equal to 0.55 ... 0.60 of the maximum length of the roll. 4. Roller according to claim 1, characterized in that the width of the circular grooves is 0.09 ... 0.11 of the average diameter of the barrel D ', their depth (0.20 ... 0.24) D' and they are located on distance (0.28 ... 0.32) D 'from the axis of the roller.