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Sand making machine used in sand manufacturing plant

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Sand making machine used in sand manufacturing plant

June 16, 2023 nflg 0 Comments

Lay out of sand manufacturing plant is similar to Stone crushing plant . It consist of Feeding hopper, Rotopactor, Sand screen , conveyors/ elevators, electrical prime movers and controls, etc. For manufacturing Sand at large scale it is manufactured directly from bigger size stones up to 500 mm size. This bigger stones should be crushed to minus 8 mm for feeding in Rotopactor.

For reducing the stone to minus 12 mm particles, Big size stone crushers are employed. For making Sand from stone up to 500 mm feed size, A primary crusher is employed to break the stone in minus 75 mm pieces. These –75 mm pieces are further broken in Secondary crusher. Here the size is made below 40mm. This minus 40mm is further reduced to minus 12 mm size in V.S.I Crusher, and then finally it is crushed in Rotopactor and sand is manufactured.

Small machines can be used along with stone crusher units, Where Grit and fine particles are waste. With Two crushers a 15 ton per hour capacity machine can be installed. Generally 20mm metal and sand are having demand. Other size metal is not selling fast. A special arrangement can be recommended. One 20X12 Crusher, One V.S.I. Crusher of Capacity 30 Tons per hour, and a Rotopactor can give about 15 tons metal and 15 tons sand per hour. The Crusher is set for crushing minus 40 mm crushed size, this is then fed to V.S.I. Crusher, where it is reduced and 20 mm metal is separated, and remaining is crushed below 10mm, which is further crushed to make Sand. This arrangement can give more production more economically than two crushers. The 20mm metal such produced is having cubical shape. ( Cubical metal gives good strength to concrete.

The Rotopactor is a specially designed machine for manufacturing of the sand from grit. It is having a Rotating Disc, which throw the stone particles at vigorous velocity, which collides with annular rings. It breaks and rebounded in up ward direction. Again it falls down making a complete screen of stone particles. The new particles thrown from rotor, collides against these screen and breaks the stone into finer particles.

The design of the Rotopactor disc and annular ring is of very special type, which give very efficient result. The maximum collision is stone on stone. In the process the final particle are of cubical shape and its sharp edges are rounded off. The stone particles are ejected from the Rotor due to centrifugal force at a particular angle, which strikes with the annular ring (anvil ring ) and diverted in circular path. The kinetic energy of the particles makes it move in a designated path. Next particles coming are colliding on these particles so as a results bigger particles breaks in to small pieces. These small particles roles around while moving in a circular path. The residual kinetic energy is utilized in giving good surface texture of the particle. The edges are rounded and surface became smooth.

In this process fine dust particles are produced below 75 microns, Presence of these finer particles in sand gives more plasticity to sand. Finer particles are not more than 3 to 4 percent from hard Rock. From the outlet of the machine in operation these are emitted from the machine, which creates pollution. A small quantity of water sprinkled over the feed material, makes these fine particle to stick over the sand, so reduces the pollution. The water should be small quantity, not more then 60 to 75 ltrs. for 100 cft sand. More water will creates jamming of the machine and coating of water over stone gives cushioning effect so reduces the production. The capacity of the machine is a factor of H. P. available and depends upon the hardness of the raw material and feed size. Softer material and smaller the feed size gives more Production.

The design of the rotor is very special (patented). The flow through the rotor is positive with less wear. The wear and tear of the rotor is minimized due to stone lining formed inside the rotor. The wear plates are of special design (patented) and made from special material, The material passing over the plates is guided in upwards directions so reduces the wearing of the plates, gives long wear life. All the wearing points are made of special material, gives very long life. Wearing of annular ring is minimized due to the stone screen formed. The wearing out cost of the rotor is less compared to any other machine.

Approximately depends upon the feed material. It may vary according to the hardness of the stone, and the feed size.
The wearing of rotor is a critical problem. When the rotor gets worn out it becomes un balance, and creates vibration to the machine. A vibration control; meter is fitted in the machines, which stops the machine automatically when the amplitude of vibration crosses a particular limit. The reason of stopping is indicated on the panel board.

The bearing housing is a very unique design, with oil lubricating system. The complete weight of the Shaft and Rotor is counter balance by Lubricating oil. Complete system is floating in oil. There is very negligible frictional loss. This is a unique technology, Reduces frictional load. Circulating oil lubricates the bearings. The driven shaft is lifted due to oil pressure so the load on the bearings reduces. The heat generated in the bearings is reduced. The heat generated in the bearing is taken by Oil. Oil is cooled in a heat exchanger cooling system by circulating water. Water is cooled in a radiator with air circulating fan. A Temperature control unit is fitted with the machine, which restrict the machine to operate, if due to any reason the temperature of the cooling oil increases the scheduled limit. All this system assures a very long bearing life.

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