Sand is one of the main raw materials of concrete, mortar and corresponding products, including natural sand and machine-made sand. Natural sand is a naturally formed sand bone, which can be directly exploited and used. Nowadays, the construction sand is widely used, and the machine-made sand is completed through the sand production line or the direct machine-made sand. With the continuous development of China's construction economy, natural sand can not meet the requirements of sand for construction,one sand production line can produce enough sand. Through the optimized design of a new type of machine-made sand and stone production enterprise, good source utilization, cleaner production operations and standardized production safety have enabled the enterprise to have good economic, environmental and social benefits.
Since natural sand and gravel are non-renewable high-quality resources in the short term, with the continuous development of capital construction, the high-quality natural sand and gravel resources that can be mined in some areas of our country are gradually decreasing, and there is even no high-quality natural sand and gravel resources that can be mined. In addition, the over exploitation of natural sand and stone has caused increasing pressure on the natural environment. The use of machine-made sand and stone to replace natural sand and stone has become a trend of sustainable development of China's construction industry. The traditional machine-made sand and stone production lines are generally small in scale, they feel that the machine-made sand and stone production is simple and does not need design, the facilities are simple, the mining is disorderly, the good source is wasted, the management is backward, the environment is bad, and the quality is poor, which can not meet the needs of development. Therefore, a new type of machine-made sand and stone production line came into being, and the standardized design of machine-made sand and stone production line is imperative.
Selection basis of machine-made sand and gravel production line:
Determine the product variety, specification and category according to the market demand, and determine the production process and equipment selection. According to the experimental results of process properties, auxiliary facilities and appropriate operators consistent with the production scale and process shall be configured. Through process optimization and rational allocation of good sources, reduce the conveying length, smooth material conveying and transfer, and consider sufficient stacking, loading and unloading and equipment maintenance sites.
Specific processes to be implemented for the design of machine-made sand and gravel production line:
Determine the reasonable elevation and position of the coarse broken platform according to the good source of the mine, The aggregate plant shall be arranged near the quarry to reduce the transportation distance of raw materials. Selection of plant site in the production line:The blasting danger area must be avoided, and the safety distance shall comply with the provisions of relevant specifications, The plant site should be close to the existing transportation roads, water sources and power sources, and away from towns or residential areas. General layout design: On the premise of meeting the process requirements, the general layout shall be as compact as possible, save land, make full use of the existing terrain for design, reduce the quantities of earthwork and stonework, and the coarse breaking position shall be close to the direction of the material incoming from the stockyard, it shall be avoided to arrange important workshops such as crushing, screening and sand making in karst caves, landslides, debris flows and filling sections. Select equipment with high level of electrical automation: Adopt reliable DCS or PLC control system, with high automation level, reduce the fixed number of operating posts and reduce production costs. Building structure: On the premise of meeting the production requirements, it shall be arranged in the open air as far as possible. Pay attention to ventilation, heat dissipation, sound insulation, shock absorption and other measures in the workshop, and take technical measures such as fire prevention, explosion-proof, waterproof and moisture-proof. Mining: In terms of mining, it is necessary to formulate a reasonable mine development and utilization plan. When mining good sources of mines, it is necessary to consider returning farmland to forests, so as to achieve development and utilization, protect the ecology, and build a good source, economical and environment-friendly production line.
