SU1433497A1 - Drum for self-grinding mill - Google Patents

Abstract

The invention relates to the construction of drums and can be used in mills used for self-grinding of ores and non-metallic materials in the cement, chemical and mining industries. The aim of the invention is to increase the strength and reliability of the drum. The self-grinding mill drum includes a shell 1 with outer longitudinal stiffening ribs 11 and end walls 4, 5 with radial stiffeners 13 and 15 on the outer and inner surfaces. On the outer surface of the shell 1 and the end walls 4, 5 are annular ribs 12, 14 stiffness. 4 hp f-ly, 3 ill.

Description

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11433497

FIELD OF THE INVENTION The invention relates to a self-grinding technique, namely to mills used for self-grinding.

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ores and nonmetallic materials in the cement chemical and mining industries.

The purpose of the invention is to increase the strength and reliability of the drum.

Fig. 1 shows schematically the proposed drum of the self-grinding mill, the sectional view; in Fig. 2, view A in Fig. 1j in Fig. 3, section B-B in Fig. 2; one,

The self-grinding mill drum is a prefab design, the shell 1 of which consists of segments 2 connected by bolts 3. And the end walls 4 and 5 consist of four sectors 6 connected by means of flange fasteners 7, Segments 2 of shell 1 and sectors 6 of walls . 4 and 5 are made of sheet roll, Shell 1 and end walls 4 and 5 are connected by welding. The end walls 4 and 5 are connected by bolt fasteners 8 with loading 9 and unloading 10 pins on the inner diameter. On the outer surface of the shell 1, longitudinal ribs 11 of stiffness welded to the ring Bbw by edge 12 of stiffness are welded. An annular rib 12 is installed in the middle part of the drum, where, during the operation of the mill, the greatest tensions and deformations were recorded, and the outer surface of each of the end walls 4 and 5 welded radial stiffeners 13 and annular fin 14, matched with radial fin 13. The JBoe stiffening rib 14 is located at the place of the observed maximum deformations of walls 4 and 5 at a distance of about 1/4 (Dd) from the internal diameter of the wall, where D and d are the external and internal diameters of the wall. Ribs 11-14 stiffness have a T-profile. On the inner surface of the end walls 4 and 5, additional radial ribs 15 of U-shaped cross-section welded to the ends are welded to the ends, tape 1, the inside surface of the trunnions 9 and 10 and the drum, including the surface of the radial stiffeners, is lined (not shown) made of, for example, manganese steel. Using a lining on the inner surface of the drum, lifters are used to lift

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grinding material to a greater height during rotation of the mill.

The self-grinding mill operates as follows.

The material to be self-comminuted is fed into the drum through a hollow boot trunnion 9. As the drum rotates, pieces of material are lifted with the help of lifters to a certain height and, falling and hitting each other and against the lining of the drum, are destroyed. The grinding product leaves the mill through an unloading trunnion 10. The increased alternating shock and vibration loads that occur during grinding of the material are perceived. The drum, while the additional external radial stiffening ribs in combination with the outer ring and shell edges and 7 orts walls installed in the place of the supposed greatest stresses and strains, are reinforced by ribbing the entire outer surface of the drum and filling the inner walls of the end walls ,, guarantee the reliability and durability of the mill. Execution — all parts of the housing from the rolled stock reduce the cost of the mill and prevent the occurrence of damage associated with the casting defect. Increasing the strength and reliability of the drum allows the mill downtime and costs associated with the repair of the drum. In addition, the structures and the drum can improve the reliability of fastening the grids on the elevators of the unloading device, since the stiffening ribs on the inner side of the end wall in the discharge end of the mill protect the elevators and the grids from impacts of the grinding medium. The reliability of fastening of the end linings and grinding efficiency is increased, since the internal ribs on the loading side reliably fix the end linings by unloading the IR bolts from transverse loads caused by the action of the grinding medium, and the ribs themselves play the role of face lifters, helping to increase the grinding efficiency,

Claims (5)

Claim 1, self-grinding mill drum, pulley shell with outer longitudinal stiffener ribs and end walls with radial stiffeners on the outer surface characterized by the fact that, in order to increase the strength and reliability of the drum, on the inside of the end shank there are additional radial stiffeners welded to the ends of the shell. 2, Pop-drum 1, characterized in that annular stiffening ribs attached to the radial ribs are fixed on the outer side of each end wall. View/} ае.2 3. A drum pop. 1, characterized in that annular ribs are attached to the outer surface of the shell and mated with longitudinal ribs. 4. A drum pop. 1, characterized in that the additional radial stiffeners are made with a U-shaped cross section. 5. Drum on PP. 2 and 3, characterized in that the annular and the radial stiffening ribs of the end walls and shell are made of T-section. / J  f as.d 15