Dry-method sand manufacturing machine

Abstract

The invention relates to the technical field of sand manufacturing equipment, and particularly relates to a dry-method sand manufacturing machine. The dry-method sand manufacturing machine comprises a feeding port, an upper shell, a lower shell, grinding rollers, a grinding disc, a support, an overhauling device, an inner screening device, a working cylinder, a scraper blade, a discharge port, a reduction box, a coupler, a main motor and foundation bolts, wherein the feeding port is arranged in the central position of the upper part of the upper shell, the discharge port is arranged on a bottom plate of the lower shell, the grinding rollers are uniformly distributed on the grinding disc, the inner screening device is fixed on the upper shell through a regulating device, and the support can support the grinding rollers, the upper shell and the lower shell and is connected with a base through the foundation bolts. The dry-method sand manufacturing machine provided by the invention has the advantages that the sand grade is conveniently regulated through regulating the size of grinding force of the grinding rollers and a gap between a moving ring and a static ring, the reasonable fineness modulus is controlled, and the content of mountain flour in machine-made sand is regulated; meanwhile, few needle-shaped and sheet sand is manufactured by the machine under the action of a grinding force and a shear force, and the machine-made sand is good in particle shape; in addition, by virtue of a dry method for manufacturing, the appropriate mountain flour content in machine-made sand is remained, the grade of the machine-made sand is optimized, and meanwhile, the water resource is saved.

Description

technical field [0001] The invention relates to the technical field of sand making equipment, in particular to a dry sand making machine. Background technique [0002] With the pull of domestic demand, the investment in infrastructure such as roads and railways in various places is increasing, and there is an urgent need for a large amount of sand and gravel. In order to protect the ecological balance, the state expressly prohibits unauthorized excavation of natural sand (except for cleaning rivers). The supply of natural sand cannot keep up with the demand. Therefore, the development of machine-made sand is very urgently put on the agenda. In view of the fact that machine-made sand is mechanically crushed after rock blasting or pebbles are mechanically crushed and screened, its strength and other properties are superior to natural sand. On the other hand, some metal and non-metal mines produce a large amount of tailings in the process of mining and processing, which urge...

AI Technical Summary

Problems solved by technology

[0004] a. The grain shape is not good, and there are too many needles and flakes. There are rock problems here, but it is mainly caused by equipment selection, which is caused by jaw crusher or hammer crusher.

[0005] b. The gradation is not completely reasonable, and the fineness modulus is too large. In order to reduce mechanical wear and reduce production costs, most enterprises produce machine-made sand with a fineness modulus of more than 3.0, while the fineness modulus of prepared concrete is best at around 2.6

[0006] c. The problem of washing away all the stone powder existing in wet sand making

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