Introduction to machine sand equipment knowledge

With the pull of domestic demand, the investment in infrastructure such as roads and railways is increasing, and a large amount of sandstone is urgently needed. In order to protect the ecological balance, the state expressly prohibits the excavation of natural sand (except for clearing river courses). The supply of natural sand can hardly keep up with demand. Therefore, the development of the mechanism sand is very urgent to mention the agenda. In view of the fact that the mechanical sand is rock blasting, mechanical sand or river pebbles are sanded and sieved by sand making machine, and its strength and other properties are superior to natural sand. Mechanical sand is superior to natural sand in both physical and chemical properties. We must stand at the strategic height, establish and implement the scientific development concept, enhance the sense of responsibility of human environmental protection, vigorously develop and actively promote the mechanism sand equipment. Although China's research and development of mechanical sand technology and equipment started late, the development is slow. Some large-scale water conservancy projects use artificial sand. Many of the key sand making machines are imported from abroad. There is still a certain gap between the development of domestic mechanical sand equipment and the advanced level of foreign countries. However, we believe that after a period of hard work, it is able to catch up with or surpass foreign similar equipment. Nowadays, it is still good to use some mechanical sand equipment in China. It is worthwhile to choose sand making materials as appropriate. The requirements of sand and gravel industry are different from those of mine grinding industry. At present, most of the companies that produce sand-making equipment are responsible for the mining machinery manufacturing industry. Therefore, we must first understand the requirements of sand and gravel. 1. The granule requirements of the mining equipment for sand making materials are fine. In general, the needle-like material enters the mill and is more susceptible to grinding. The requirements for gravel are contrary to the above, and the requirements for grain size and grain size are very strict. The reason is that the cubic sand has a function of locking each other due to its angular shape. The continuous grading of the sand can greatly reduce the gap. At the same time, the cubic sand occupies a larger surface area than the round sand, which makes the asphalt and materials or cement and materials stick together to reduce the possibility of displacement. 2 According to the definition of the mechanism sand: rock particles with a particle size of less than 4.75 mm made by mechanical Sand making machine and sieving after soil removal treatment. But does not contain soft rock, weathering rock particles. 3 sand specifications: sand specifications are divided into coarse, medium and fine according to the fineness modulus (Mx). Among them: the fineness modulus of coarse sand is 3.7~3.1, the fineness modulus of sand is 3.3~3.0, the fineness modulus of fine sand is 2.2~1.64, and the grade of sand is divided into: I, II, III according to its technical requirements. Three levels. Uses: Class I sand is suitable for concrete with strength grade greater than C6. Class II is applicable to concrete, hydraulic concrete with strength grades C30~C60 and antifreeze, impermeability or other requirements. Class III sand is suitable for concrete and construction mortars with a strength class less than C30. Characteristics: The particle size of sand is between 4.75~0.15mm, and the stone powder less than 0.075mm should have certain limits. The particle size is 4.75, 2.36, 1.18, 0.60, 0.30, 0.15, preferably continuous, and each A certain grade should have a certain percentage, and its granular shape is preferably a cube, and its needle-like content is also required. There are many mining equipments suitable for the production of sand. However, for the moment, there are mainly the following seven types: 1. Vertical impact sand making machine; 2. Counterattack fine sand making machine; 3. Jaw crusher; 4. Roller sand making machine 5. Cone sand making machine; 6. Rod mill. These sand making equipment have different characteristics and each has different uses.