SU1650248A1 - Grinding member for drum mill - Google Patents

Abstract

The invention relates to the grinding of materials and can be used at concentrating factories in ferrous and nonferrous metallurgy, in the building materials industry, in the chemical and other industries, where drum mills are used. The aim of the invention is to increase the efficiency of the grinding element in operation by increasing its working surface. The grinding element for the mill drum is an axially symmetric elongated body made in the form of a rod 1 placed in a sheath 2 of non-metallic material, which is attached with an internal gap and fixed on the ends of the rod t working elements 3 of wear-resistant material made in the form of truncated cones contacting alternately large and smaller bases and having each central conical opening, the larger base of which is located on the side of the smaller base is truncated cone, 3 Il. (L

Description

1

The invention relates to the grinding of materials and can be used at concentrating factories in ferrous and nonferrous metallurgy, in the building materials industry, in the chemical and other industries, where drum mills are used.

The purpose of the invention is to increase the efficiency of the grinding element by increasing the working surface.

Figure 1 shows the grinding element in the collection, a longitudinal section; Fig. 2 shows the layout of adjacent rows of grinding elements, top view; fig. 3 - the same, view along the axis of a series of elements.

The grinding element for a drum mill is an axially symmetric extended body made in the form of a metal or plastic rod 1 placed in a sheath 2 of non-metallic material that is worn with an internal clearance and fixed on the ends of the rod 1 working elements 3 of wear-resistant material, for example bleached cast iron, made in the form of truncated cones. The latter are in contact with each other alternately by large and smaller bases and each have a central conical opening, the larger base of which is located on the side of the smaller base of the truncated cone. The elements 3 are fastened at the ends of the rods 1 with cotter pins 4 and washers 5.

The grinding elements work when the drum rotates and feeds the source material into it in the same way as the rod load. The work elements of the outer row, pressed against the lining of the drum mill small load, fixed

relative to the lining and rotate with it around the drum axis until it reaches the highest point of its slope, inclined to the horizontal at an angle close to 20 °, and then roll down along the slope to the lining, rotating at the same time around the axes of the rods 1 The rows of grinding elements located closer to the center move along a similar trajectory, but shorter.

When the upper elements are rolled along the lower ones, the particles of material that are on their contacting and moving one relative to the other surfaces are comminuted. A portion of the material is crushed on the surface of the lining when it comes in contact with the load of grinding elements. The ground material is discharged from the mill drum as usual.

Claims (1)

A grinding element for a drum mill, made in the form of an axisymmetric elongated body, characterized in that, in order to increase its efficiency by increasing the working surface, the elongated body is made in the form of a rod placed in a sheath of non-metallic material, on which working elements are worn with an internal gap and fixed on the ends of the rod, of wear-resistant material, made in the form of truncated cones, which are alternately in contact with each other larger and smaller bases and having each central conical opening, the larger base of which is located on the side of the smaller base of the truncated cone. l-gpf