RU69773U1 - CLEANING ENVIRONMENT OF A DEVICE FOR GRINDING MATERIALS - Google Patents

Abstract

Usage: The utility model relates to the technique of grinding various solid materials and can find application in the chemical, mining, metallurgical industries, as well as in the building materials industry. Objective: increase the life of the grinding media. Essence: The use of rolling bodies of mechanisms and machines made of alloy steel with a hardness of at least 59 Rockwell units and having lost their consumer properties before operation, as a grinding medium for a device for grinding materials.

Description

The utility model relates to the technique of grinding various solid materials and can find application in the chemical, mining, metallurgical industries, as well as in the building materials industry.

The working bodies of the grinding medium of the device for grinding materials are called grinding bodies and they are made in the form of rolling bodies: ball, roller, etc. Depending on the shape of the grinding body, devices for grinding materials are divided into groups, for example: drum mills (ball, rod, etc.), roller mills, roller mills, etc., vibration mills with a swinging housing, etc. (see. Polytechnical Dictionary. M., "Soviet Encyclopedia" p. 294).

Grinding bodies in the process of grinding materials are subjected to intense wear. Therefore, increased wear resistance requirements are imposed on the surface of the grinding body. Grinding bodies are made of alloy steel, most often of steel SHKh-15 and with a hardness of up to 60 Rockwell units. Therefore, the production of grinding media is an expensive production.

In order to reduce the cost of grinding bodies, various products that have been used for their life, for example, disposed railroad tracks (see PM No. 36774 of 12/15/03, 02 C 17/20), disposed artillery shells made of alloy steel, are widely used for their manufacture. (see application for invention No. 98100707 of 01/13/98. 02 C 17/20).

The closest technical solution chosen by the applicant as a prototype is a grinding medium with grinding bodies in the form of a rolling body: a ball, a cylindrical, conical or spherical roller made of alloy steel and having a hardness of at least 60 Rockwell units and made of used bearing life

rolling (see the description of the utility model No. 32708 from 05/12/03. publ. 09/27/03., 02 C 17/20).

The disadvantage of the prototype is the limited life of the rolling elements of ball bearings as grinding bodies due to the fact that the rolling elements have already worked out their life and life for its intended purpose.

The technical task of this utility model is to increase the life of the grinding media.

The problem is solved by using rolling bodies of machines and mechanisms made of alloy steel with a hardness of at least 59 Rockwell units and having lost their consumer properties before operation, as a grinding medium for a device for grinding materials.

Although consumer properties for the intended purpose of rolling bodies of machines and mechanisms have been lost, it is possible to use them for a long time as grinding media for grinding media of various devices for grinding materials. The rolling bodies of machines and mechanisms with lost consumer properties before the start of operation can be compared in terms of performance to grinding media newly manufactured using traditional technologies when the surface layer has not yet been subjected to wear. Therefore, the service life of such grinding bodies is significantly increased in comparison with the prototype.

Conducted patent research did not reveal similar technical solutions, which allows us to conclude about the novelty of the claimed technical solution.

The proposed solution can be widely used in industry in the conditions of lean technologies and the secondary use of materials and products.

The essence of the utility model, which consists in the use of rolling bodies of mechanisms and machines made of steel with a hardness of at least 59 Rockwell units and having lost their consumer properties before operation, as a grinding medium for a device for grinding materials, is explained as follows.

The grinding medium may consist of rolling bodies having the shape of a cylinder, a truncated cone, the shape of a ball, a roller, and be intended for

drum ball mills, for centrifugal mills, for planetary mills, etc. The rolling bodies of mechanisms and machines that have lost their consumer properties include bearing balls and rollers of the bearing assembly, ball joint of the overrunning clutch, ball screw, ball valve, locking device, equipment for calibration tests, constant velocity joint, etc.

The rolling bodies of the above mechanisms and machines can lose their consumer properties before the start of operation, when in some cases, for example, during manufacture, improper installation, improper transportation, loading, unloading, storage, some defects can be detected on the rolling bodies, for example, slight deviation from the form, from the nominal diameter, dents, risks, grinding annealing, etc., as a result of which their use for their intended purpose becomes impossible. But the structure of the metal, the hardness of the product does not change.

It is known that the requirements for rolling bodies in terms of dimensional tolerance are more stringent than for grinding bodies (see GOST 7524-89 on "Grinding steel balls for ball mills", GOST 3722-81 on "Rolling bearings. Balls. Technical conditions", GOST 22696-77 on "Rolling bearings. Short cylindrical rollers. Technical conditions"). Therefore, rolling bodies of mechanisms and machines that have lost their consumer properties before the start of operation can be successfully used as a grinding medium for a device for grinding materials.

Rolling bodies must be made of alloy steel with a hardness of at least 59 Rockwell units. The thickness of the wear-resistant shell of the rolling elements is carried out depending on the diameter of the rolling element from 5 to 15 mm. Among alloyed steels with a hardness of at least 59 Rockwell units, the most widely used material for rolling elements is steel according to GOST 801-78 “Bearing steel. Specifications ": ШХ-15, ШХ4, ШХ15СГ and ШХ20СГ.

The movement of the grinding medium composed of rolling elements is carried out during rotation of the mill drum. In a mixed cascade-waterfall mode of movement of grinding media, for example in a drum ball mill, grinding occurs due to direct impact, abrasion and

crushing material by falling rolling and sliding rolling elements.

Claims (1)

The use of rolling bodies of mechanisms and machines made of alloy steel with a hardness of at least 59 Rockwell units and having lost their consumer properties before operation, as a grinding medium for a device for grinding materials.