Five-double full-dry method crushing production line and processing method for high-quality sandstone aggregates

Abstract

The invention discloses a five-double full-dry method crushing production line and processing method for high-quality sand aggregates. The production line comprises a material pretreatment system. A discharge port of the material pretreatment system is connected with a feed port of double-impact crushing equipment of a fine coarse aggregate processing system, a discharge port of the material pretreatment system is connected with a primary classifier, and a discharge port of the primary classifier is connected with a finished product screening and proportion adjusting circulation system. A super-particle-size material outlet of the finished product screening and proportion adjusting circulation system is circularly connected to a feed inlet of double-speed double-frequency crushing sand making equipment. The fine sand aggregates are connected to corresponding finished product bins or are circularly connected to the feed inlet of the double-speed double-frequency crushing sand making equipment, and multi-stage powder selecting equipment is arranged below a fine sand outlet. According to the production line, the production line with multi-stage desliming, double-countering-impact crushing, double-vertical-shaft impact crushing shaping sand making, multi-stage powder selecting and multi-stage circulation is adopted, so that the system productivity and the quality of the finished sand aggregates are improved effectively, the efficient and energy-saving effects are realized, and the practicability is high.

Description

technical field [0001] The invention relates to a high-quality sand and gravel aggregate five-double full-dry crushing production line and a processing method, which belong to the technical field of sand-making production equipment and sand-making production technology. Background technique [0002] At present, in the production of sand and gravel aggregates, the traditional sand and gravel aggregate production line usually uses rod feeders to feed materials evenly, and uses coarse crushing jaw crushers, medium crushing cone crushers or impact crushers for crushing to complete raw material pretreatment, and then The pretreated material enters the vertical shaft crusher for crushing, and enters the screening system for screening. The qualified products enter the finished product warehouse through the finished product belt conveyor, and the oversized materials are transported back to the vertical shaft crusher for mechanical crushing through the return belt conveyor. This conve...

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Problems solved by technology

[0002] At present, in the production of sand and gravel aggregates, the traditional sand and gravel aggregate production line usually uses rod feeders to feed materials evenly, and uses coarse crushing jaw crushers, medium crushing cone crushers or impact crushers for crushing to complete raw material pretreatment, and then The pretreated material enters the vertical shaft crusher for crushing, and enters the screening system for screening. The qualified products enter the finished product warehouse through the finished product belt conveyor, and the oversized materials are transported back to the vertical shaft crusher for mechanical crushing through the return belt conveyor. This conventional crushing production line The advantages are: simple structure, saving equipment investment, but single configuration, low practicability, unable to guarantee product quality and adjust the output ratio, there are many defects: (1) high requirements for raw materials, only using bar feeder for simple The advanced desliming process cannot remove small particles of mud and mud mixed with incoming mine materials. The desilting effect is limited. The treatment of raw materials with high mud content is not clean, which affects the efficiency of subsequent sand making and the quality of finished sand and gravel, and affects the quality of sand and gravel. Aggregate quality affects the quality of concrete, while increasing the use of admixtures, increasing the cost of concrete configuration, and causing the instability of concrete; (2) The traditional production line has low crushing ratio, high energy consumption, and crack defects and needle flakes in the product High content of defects, low output, if you need to increase the feed particle size, you need to replace a larger type of equipment, increase energy consumption; (3) The conventional vertical shaft crusher is mainly used for shaping, the crushing capacity is limited, the crushing ratio is low, the traditional In order to take into account the effects of sand making and shaping, the equipment requires that the feed particle size be less than 15mm to ensure the stability of the equipment. If the production capacity needs to be increased, the number of equipment needs to be increased to ensure it, which increases the investment; (4) The single host process only Single-stage crushing, small crushing ratio, unreasonable product gradation and cannot be adjusted

The processing capacity is low. If you need to increase the output, you must reduce the feed particle size to achieve it. To reduce the feed particle size, you must add a section of crushing, which will also increase equipment investment; (5) The product is single. Because the feed particle size is too small, it can only be produced. Sand cannot produce aggregates (high-quality rice stones and high-quality crushed stones) at the same time. The production is not flexible and cannot meet customer needs. If customers need high-quality rice stones and high-quality crushed stones, it is bound to increase equipment (production line / system) investment; (6) for raw materials Due to the weak processing capacity of the raw material pretreatment section and the sand making section, the proportion of stone powder contained in the machine-made sand is not easy to control, and the ultra-fine powder is not easy to remove, resulting in unreasonable gradation of the machine-made sand. When the raw material contains powder or contains When the mud is high, the cost of dust removal is high; (7) The traditional production line is too simple to form a circulation loop, and the product output ratio cannot be adjusted according to market demand. The ratio is unreasonable, which increases production costs and brings storage pressure in the silo. will affect the production run

(8) The process is simple, and only machine-made sand with a single stone powder content can be produced, and the content of machine-made sand and stone powder is generally 13%-15%, resulting in poor quality stability of concrete, which cannot meet the requirements of machine-made sand with different strengths of high-performance concrete, and increases Concrete Mixing Cost

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