SU1595920A1 - Method of packing the case of tapping hole of blast furnace - Google Patents

Abstract

This invention relates to ferrous metallurgy and can be used in other industries to compact materials in confined spaces. The aim of the invention is to increase the durability of the case, increase its service life and reduce the time of stuffing. The method is carried out as follows. Throughout its cross section, a portion of the refractory mass is loaded into the cavity of the case, which is tamped with a device for stuffing the case with three interchangeable heads. In this case, the replaceable head acts on the peripheral annular zone of the case, providing effective mass adhesion to the walls of the case. In a similar way, the second portion of the mass is loaded and the peripheral and central zones are simultaneously rammed, and then a third portion of the mass is loaded and only the central zone is rammed. As a result, a nest is formed under the tip of the gun. In each case of tamping the above zones, the ratios of their cross-sectional areas of the case are maintained within 0.30-0.56. 4 il.

Description

The invention relates to ferrous metallurgy, in particular, to methods of stuffing the case of a pig-iron notch of blast furnaces, and can be used in other areas of compaction of materials in a confined space.

The purpose of the invention is to increase the durability of the case, increase its service life and reduce the time of stuffing.

According to the method, tamping is carried out sequentially by zones; first the peripheral zone, then the peripheral and central zones at the same time and the central zone with the ratio of their areas to the cross-sectional area of the bottle in the range of 0.50-0.56, 0.30-0.35 and 0.45-0.50 respectively At the same time, before the start of the tamping of each zone, another portion of the refractory mass is loaded into the cavity of the case, which overlaps the case over its entire cross section.

The rational ratio of the packing area to the cross-sectional area of the case was determined experimentally by applying tampers of various configurations. When the ratio of the packing area to the cross-sectional area of the sheath is more than 0.56, the quality of the close fit of the refractory mass to the walls of the sheath is not ensured. When the coefficient of wear is less than 0.30, the refractory mass is forced into the gap between the diameter of the cavity of the case and the diameter of the tamper, and the density of adhesion of the mass to the walls of the case increases slightly.

The method is implemented by means of a device for stuffing a case with interchangeable ramming heads.

FIG. 1 shows a device for implementing the stuffing method, general view; in fig. 2 — node I in FIG. 1 (ramming head for stuffing the peripheral zone of the case): FIG 3 is the same ramming head for stuffing the peripheral and central zones at the same time; 4 is the same, the ramming head for stuffing the central zone of the case.

 The device contains a suspension 1 and a working body 2 in the form of an air hammer equipped with three interchangeable ramming heads (hereinafter, tampers).

The first removable tamper 3 has on the working side a cavity with a hole a, amounting to 0.30-0.32 diameter of the case diameter D, and a side two-cone surface with an angle of inclination to the axis

about 30-32 and "; 70-72 °, respectively, to diameters D, 0.75D and P, 0.95P. Pars 1 meter tampers are set according to the conditions of ensuring the required density of the rammable bed, taking into account the test results.

The second shift tamper 4 has

truncated cone on a flat base Smaller diameter of the cone d (0.350 40) 1). and the angle of inclination is

9 I .. with

cone to his

 c / axis is 25-30

The tamping parameters are determined taking into account the same conditions.

- The third removable tamper 5 is made in the form of a flat base with a central cylindrical protrusion of diameter Dj to form the development of the axial seat of the tap channel.

 The method is carried out as follows.

in a way.

0

five

five

A double cone rammer 3 is placed on the pneumatic hammer. In the cavity of the case, 32 kg of mass is laid with an even layer 150 mm thick over the entire cross section of the case. Ram the first layer until the main portion of the mass is redistributed to the walls of the cavity of the case. In this case, directions are created for the day of stuffing of the peripheral zone of the case in the volume formed by the cavity of the case and the surface of the tamper. The ratio of the packing area to the cross-sectional area of the sheath is 0.50-0.56.

Lay the next portion (32 kg of mass) in a uniform layer 150 mm thick, establish a second tamper. Ramming the layer, inserting the rammer to the depth of the truncated cone. At the same time, part of the mass is redistributed to the peripheral zone, it is completely filled, and the remaining part is filled in the central zone, up. her. Combined force directions are created in the volume formed by the surface of the preceding one (its stuffing layer and the tamping surface. The ratio of the areas in this case is 0.30 and 0.35.

The third rammer is installed and the rest of the mass (U kg) is put into the case, filling the case completely. Ramming the layer, inserting a central protrusion, at the same time, the base, tamping overlaps the cavity section, preventing the mass from exiting the shell. The area ratio is 0.45-0.50.

The present invention allows to reduce the number of packing operations, to increase the durability of the case, to increase its service life, to reduce the silent running of the furnace during repairs of the case of the 45 cast iron taphole. This leads to an increase in the output of the metal and to the saving of the conditional fixed costs of redistribution. The economic effect of using the method is approximately 3181 rubles.

thirty

40

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formula of the invention

The method of stuffing the case of a pig-iron notch of a blast furnace, including the sequential laying of the refractory mass by means of a targeted transfer of forces from the working body, its compacting process, which is different. by the fact that, in order to ensure the stability of the case, to increase its life. services and reducing stuffing time, tamping is carried out sequentially by zones: first the peripheral zone, then the peripheral and central zones at the same time and the central zone with respect to their area to area

case cross-section within 0.50-0.56, 0.30-0.35, and 0.45-0.50, respectively, before starting the tamping of each zone, another portion of the refractory mass, crossing the case, is loaded into the cavity of the case p across its cross section.

vt (1

FIG. 2

FIG. 3

Editor M, Petrova

Fy

Савч-авитель В ,. Korobov

Tehred M,. Khodanich Proofreader O. Kravtsova

Order 2890

Circulation 496

VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology cqCP 113035, Moscow, Zh-35, 4/5 Raushsk Nab.

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Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101

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Claims (1)

Claim The method of stuffing the case of the pig-iron notch of the blast furnace, which includes the sequential laying of the refractory mass by means of a targeted transfer of forces from the working body, its tramming, different in that, in order to increase the resistant 1595920 five This case, increasing its service life and reducing the time of stuffing, tamping is carried out sequentially by zones; first the peripheral zone, then the peripheral and central zones at the same time and the central zone with respect to their area to area 6 the cross-section of the case in the range of 0.50-0.56, 0.30-0.35 and 0.45-0.50, respectively, prior to the start of tamping of each zone into the cavity ⁵ case load the next portion of the refractory mass, overlapping the case throughout its cross section. 2 3 1595920