Coarse and fine crushing integrated type middling coal wet crushing machine

Abstract

A coarse and fine crushing integrated type middling coal wet crushing machine is especially suitable for crushing and dissociating high-water-content middling coal obtained after gravity separation and medium draining in a coal preparation plant. The coarse and fine crushing integrated type middling coal wet crushing machine comprises a feed hopper, a first crushing chamber, a second crushing chamber and a discharge hopper. The first crushing chamber is located above the second crushing chamber and communicated with the second crushing chamber. Blade type crushing rollers are arranged in the first crushing chamber and used for coarsely crushing the middling coal, and groove type crushing rollers are arranged in the second crushing chamber and used for finely crushing the coarsely crushed middling coal. Anti-blocking flushing water pipes are arranged on the lower side inner wall of the first crushing chamber and the lower side inner wall of the second crushing chamber respectively. The coarse and fine crushing integrated type middling coal wet crushing machine is simple in structure, coarse crushing and fine crushing of the high-water-content middling coal are achieved in the same machine, and blocking is unlikely to occur; the upper limit of particle sizes of crushed products is low, the particle sizes of the products are uniform, and the frequency of excessive crushing phenomena is low; no dust is generated during crushing, and secondary separation in gravity separation of the middling coal after crushing and dissociation is facilitated.

Description

technical field [0001] The invention relates to a coarse and fine crushing integrated medium coal wet crusher, which is especially suitable for crushing and dissociating medium coal with high moisture content after gravity separation and de-intermediation in coal preparation plants. Background technique [0002] At present, the secondary separation of re-selected coal in coking coal preparation plants has attracted more and more attention. After the re-selected coal is crushed and dissociated, about 20% of coking clean coal can be obtained through re-sorting. However, in order to separate the clean coal from the re-selected coal, the heavy-selected coal must first be crushed and dissociated to about 2mm in bulk with high water content (maximum particle size 50mm-100mm). Existing industrial crushing equipment, such as jaw crushers, hammer crushers, impact crushers, toothed roller crushers, etc., are mainly used to crush coal with low moisture content, and the upper limit of t...

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Problems solved by technology

Existing industrial crushing equipment, such as jaw crushers, hammer crushers, impact crushers, toothed roller crushers, etc., are mainly used to crush coal with low moisture content, and the upper limit of the crushing particle size is generally above 13mm. If the above-mentioned crushing equipment is used to crush and dissociate heavy coal with high water content (maximum particle size 50mm-100mm) to about 2mm, there are problems such as low equipment processing capacity, easy blockage of the crushing cavity, over-crushing of the product, and low crushing efficiency. The problem is that even though toothed roller crushers have been widely used in coal preparation plants, it is difficult to crush coal blocks to about 2mm through a reasonable tooth profile design

Although there are reports in the literature that coal preparation plants use impact crushers to crush and re-select coal, they have not been used for a long time because the crushing chamber is easy to block and often has problems such as parking.

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