Saimo SM Sweep Sampling System
Saimo's belt sampling systems can be either a two stage or a three-stage sampling system. The two-stage sampling system is ideally suited for smaller particle size and lower tonnages applications. The three-stage sampling system is mostly used for greater particle size and higher flow rate applications.
The two-stage sampling system is capable of handling coal sized not greater than 100mm at a flowrate not exceeding 2000t/h. The collected sample is delivered from the primary sampler to the belt feeder and crusher where the initial divided sample can be processed.
The secondary sampler installed downstream after a secondary feeder is able to extract the final sample which is fed into a dustproof and watertight collector for laboratory analysis.
The three-stage sampling system is well suited to handle particle sizes of greater than 100mm at a flowrate of greater than 2000t/h. The primary sampler collects a sample from the belt in compliance with the applicable standard.
The sample is then delivered through a belt feeder to the secondary sampler at the minimum increment weights as prescribed by ASTM D 2234, and subsequently via a conveyor to a crusher where the sample is reduced to 100% -4 mesh and 95% -8 mesh.
The sample is then metered by a belt feeder to the tertiary sampler where a final division of the sample is carried out. The final sample is collected in a dustproof and watertight container for transportation to the laboratory where final analysis is performed.
Belt Feeder employed in sample preparation systems offers an economic and reliable means to continuously feed a smooth sample stream to the crusher, divider and other equipment. The feedrate can be controlled and adjusted according to the specific application.
The crusher in the sample preparation system is utilized to reduce the sample to a predetermined particle size suitable for further reduction by a divider. The hammer type crusher mill has grate bars configured in suitable sizes and spacing according to the particle size requirement.
The divider is also called a secondary or tertiary sampler. Saimo dividers have two different types: the sweep type is used for extraction of reliable sample from streams on the belt, whereas the reciprocating type takes a sample from the falling coal stream.
The sweep type divider is usually used in self-contained sampling units featuring compact construction. The division ratio can be changed by means of adjusting belt speed and action interval of the divider. The reciprocating type divider is ideally suited for multi-stage sampling applications, in which the division ratio can be changed by adjusting belt speed, action interval of the divider and the cutter opening.
The final sample is fed into one can of the multi-station collector for storage. The dustproof construction of the collector reduces sample contamination and loss of moisture. Each sample can is automatically exchangeable. Sample collectors are furnished as 4,8,12 or 16 station rotary models for specific applications.
Residue Returns System
The residue return system is employed to return the rejected sample back into the mainstream after a sample is procured. Different devices can be used for this purpose, such as bucket elevator, screw feeder and belt conveyor.
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