SU587992A1 - Milling body - Google Patents

Description

(54) MELORING BODY

one

The invention relates to equipment for the fine grinding of various materials and is intended to create a grinding medium in ball and rod mills used in the mining and non-ferrous industry and in the building materials industry.

The body manipulation used in the practice of grinding, which is a homogeneous body (balls, rods, cylpeps, etc.), has a number of drawbacks. One of the main disadvantages of sushi grinding media is their rapid wear 1.

The closest to the invention in its technical essence is a grinding body consisting of a core and a wear-resistant elastic shell 2. The core is made of metal and is enclosed in a shell in the form of two hollow elements of a wear-resistant material.

The process of grinding material in mills is based on crushing it at the time of the impact of the grinding body on the material and partial abrasion. When the mill rotates, the grinding bodies and the material rise to a certain height and fall.

In the process of impact of grinding bodies on the crushed material, critical stresses arise, leading to its destruction. It should be noted that when using a known grinding body in the process of its falling into the medium of the ground product, the grinding body transfers all the kinetic energy to the material and lining of the mill without additional effects on the material.

The aim of the invention is to increase the grinding ability of grinding bodies. The goal is achieved by the fact that in a grinding body containing a core and a shell, the latter is made in the form of a hollow cylinder, inside of which there is a core in the form of

solid cylinder with a diameter smaller

diameter of the hollow cylinder, and placed in

the shell is free.

With crushed material, the grinding capacity of the medium is increased by the grinding body. The grinding of the material in this case occurs as a result of the impact of the grinding body on the material being ground and the additional oscillation of the grinding body.

Pa of the drawing shows the design of the grinding body.

The grinding body consists of a core in the form of a flat cylinder 1, encased in a shell in the form of a hollow cylinder 2, with the core diameter less than the diameter of a hollow cylinder. There is a gap between the core and the inner wall of the hollow cylinder to allow the oscillatory movement of the core inside the hollow cylinder. The hollow cylinder is closed at both ends.

Example. A test of the grinding body described was conducted under laboratory conditions. In the cylinder, made of steel, was placed a core, made in the form of a solid cylinder of the same material; The core was able to radially move inside the cylinder.

A crushed material (domain granulated slag of a wet granulation) in an amount of 2 kg and grinding bodies of the proposed design in the amount of four pieces were loaded into a laboratory mill. The material was ground for 2 hours at rpm of the mill.

During the operation of the mill, the grinding bodies and the material rise to a certain height and then fall, as a result of the impact of the grinding bodies of the proposed construction on the material and additional oscillations arising after the main impact due to the oscillatory movement of the core inside the hollow cylinder, additional NICKY stresses appear in the material contributing

more intense its destruction and abrasion.

Thus, the proposed grinding body can increase the grinding fineness, reduce the specific energy consumption and increase the productivity of the mill.

Claims (2)

1. Ilevich A. P. Equipment plants of the silicate industry, Gosstroyizdat, M., 1959, p. 237-238. 2. USSR author's certificate No. 321286, cl. In 02C 17/24, 1970.