02:35:44 AM 1/27, 2021

Development and application of large mining crusher


Mining stone crusher is mainly used for crushing large ore in the mining process. The process is crushed stone or broken stone, generally refers to the original ore after the mountain blasting, and processed into the finished particle size that meets the demand. With the development of mining crushers, the overall process of mining has been improved to a certain extent, and crushers are listed as core equipment in large-scale mining processing. Crushed stone is used in the fields of coarse ore crushing, medium crushing and fine crushing of ore according to the size of ore feed and particle size. The development of the crusher is based on the continuous improvement of the crusher application, and the product performance is also continuously improved to meet the demand to a greater extent.

In the 1980s, the stone crusher used the two jaw plates to squeeze and bend the material to coarsely or mediumly crush materials of various hardness; if the movable jaw only swings in a circular arc when working In the industry, it is called a simple swinging jaw crusher; if it swings in an arc while working, and it also moves up and down, it is called a complex swinging jaw crusher. The jaw crusher is widely used. In the mining, smelting, building materials, highway, railway, water conservancy and chemical industries, the jaw crusher crushes various materials with a compressive strength not exceeding 320 MPa. Due to the development of requirements, in order to avoid affecting the production due to the replacement of broken parts, hydraulic devices can also be used to achieve insurance and adjustment. Some jaw crushers also directly use hydraulic transmission to drive the movable jaw plate to complete the crushing of materials. These two types of jaw crushers using hydraulic transmission devices are often collectively referred to as hydraulic jaw crushers.

By the early 1970s, the gyroscopic crusher used the gyroscopic motion of the crushing hammer in the cone cavity in the shell to produce squeezing, splitting and bending effects on the material, and it was a large crushing machine that coarsely crushed various hardness ores or rocks. The upper end of the main shaft equipped with the crushing cone is supported in the bushing in the middle of the beam, and the lower end is placed in the eccentric hole of the bushing. When the sleeve rotates, the crushing cone makes an eccentric rotation movement around the center line of the machine. Its crushing action is continuous, so the working efficiency is higher than that of the jaw crusher.

The uniformity of the discharge particle size of medium and fine crushing operations is generally higher than that of coarse crushing operations. Therefore, a parallel zone must be provided at the lower part of the crushing chamber, and at the same time, the rotation speed of the crushing cone must be accelerated so that the materials are in the parallel zone Squeezed more than once. The discharge port of the cone crusher is small, and the non-crushed materials mixed into the feed are more likely to cause accidents. Because the medium and fine crushing operations have strict requirements for the discharge particle size, the discharge port must be adjusted in time after the lining plate is worn, so the cone The safety and adjustment device of the stone crusher is more necessary than the rough crushing operation. The cone crusher is the same as the rotary crusher, but it is only suitable for crushing machinery for medium or fine crushing operations. Cone crushers continue to develop, including spring cone crushers, Simmons cone crushers, single-cylinder hydraulic cone crushers and multi-cylinder hydraulic cone crushers and other stone crushing equipment.

At the same time, hammer crushers and impact crushers continue to develop, especially impact crushers have a larger crushing ratio and can make full use of the high-speed impact energy of the entire rotor. However, due to the easy wear of the hammer, its application in the crushing of hard materials is also limited, usually used for coarse crushing, medium crushing or fine crushing of limestone, coal, calcium carbide, quartz, dolomite, iron sulfide ore, gypsum and chemical raw materials, etc. Brittle materials below medium hardness.

Stone crushers are widely used in many sectors such as mining, smelting, building materials, highways, railways, water conservancy and chemical industries. At present, the commonly used crushing machinery includes jaw crusher, impact crusher, air separation crusher, hammer crusher, impact crusher, roller crusher, composite crusher, etc. used for building materials, bricks and tiles, coal , Metallurgy, mining, electric power, light industry and other industrial sectors, used for crushing coal, shale, coal slag, carbon, lime, cement, coarse soil, medium hard and brittle materials, coarse, medium and fine.


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