steel ball mill for coal crushing

Abstract

The invention discloses a steel ball mill for coal crushing. The steel ball mill comprises a milling rod and a milling body, and is characterized by further comprising a connecting component and steel balls; the connecting component is fixed to the bottom of the milling rod and connected with the top face of the milling body through four screws; the milling body is arranged to be of a hollow structure, and the multiple freely-moving steel balls are placed in the milling body; and the milling body comprises a cylinder component and an arc component, and the arc component is arranged at the bottom of the cylinder component and is arranged to be a spherical segment with the bottom end being a circular plane. According to the steel ball mill for coal crushing, the shearing force of the arc bottom is much larger than acting force applied by the hand of people to holding the milling rod, and therefore the labor intensity of a sample preparation person can be reduced; during crushing, the maximum shearing force of the arc bottom is concentrated on the contact part of the mill bottom and coal briquettes, the crushing speed of the coal briquettes is increased, and the labor productivity is improved; and when the coal briquettes are crushed through the steel balls in a milling manner, contact grinding rather than striking crushing is carried out, and therefore sample splashing is not likely to occur.

Description

technical field [0001] The invention relates to a steel ball mill for crushing coal, belonging to the technical field of coal grinding tools. Background technique [0002] For coal grinding tools, the standard GB474-2008 "Coal Sample Preparation Method" and GB / T19494.2-2004 "Coal Mechanized Sampling Part 2: Coal Sample Preparation" are described in the 8th and 7th clauses respectively "Mechanical equipment should be used for crushing, but it is allowed to crush large samples manually to the maximum feed particle size of the first crushing stage." At present, the types of rollers used by coal inspection laboratories in the coal preparation process are generally vertical and horizontal. The purpose of using rollers is mainly reflected in two aspects: 1. When the coal sample has a lot of moisture or the coal sample is very sticky, mechanical crushing The passability of the equipment cannot meet the operation requirements; 2. When the distribution of large particles in the coal...

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Problems solved by technology

[0003] In the course of daily use, it is found that the traditional vertical mill and horizontal mill have the following disadvantages: 1. Inconvenient to use, the bottom surface of the vertical mill is flat, and the friction force is relatively large during use, so it is impossible to achieve a large output with a small amount of work

2. Does not conform to body mechanics: Horizontal milling requires the user to operate in a half-squatting state, and long-term milling will cause a large labor load and waist damage to the human body

3. The scope of application is narrow: limited to the weight of the roller itself, in the face of large-sized coal blocks or hard coal blocks, neither of the two types of rollers can effectively complete the crushing of them

4. When using a vertical mill, it is easy to cause the coal sample to splash and affect the representativeness

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