Sand Grain Composition Unit

 The 029 model laboratory unit is intended for the separation of sand base according to grain size and is used in operations in soil laboratories of foundry workshops and central laboratories of enterprises.

Unit components

The bed serves for assembling all components.

The cover is a load-bearing part for all transmission gears.

The table is intended for installing sand testing sieves which serve for the determination of sand grain composition.

Operation principle of the unit

Rotational movement from the electric motor is converted to reciprocating movement by a link and is transferred to a table with sieves by an eccentric shaft. The unit is switched on by a Start button. A time switch automatically switches the unit off after fifteen minutes. The shaking of sieves is produced by a pusher, which is driven by a jaw that in turn rotates due to a bevel gear and pinion. 

The weighed portion part (sand base) remaining after clay bond washing is dried out and placed onto the upper sieve screen. A basin is placed under the lower sieve, the upper one is closed with a cover. The assembled nest of sand testing sieves is installed onto the table and fixed. The operation mode is semiautomatic. After sieving the whole tested sample is divided into twelve parts (11 sieves and one basin). Each part is weighed separately with an accuracy of 0.01 g and the value is multiplied by two. Obtained values are expressed as a percentage of weighing remnants on each sieve in relation to the whole initial 50 g weighed portion.

The unit is supplied partly disassembled, with an operating manual. Upon special order, the unit can be supplied with a fewer quantity of sieves in a nest (sieves numbers are stipulated in the agreement). In this case the unit should be completed with a sieve height adjustment device.

Sieves oscillations number, rpm300±15

Ram strokes number, strokes per minute180±10

Sieves quantity in a nest, pcs11

Operation modeSemiautomated

Screening time, min15

Mains supply current typealternate tree-phase

Frequency of periods, Hz50

Voltage, V380

Electric motor power, kW0.37

Quantity of electric motors, pcs1

Length of unit, mm690

Width of unit, mm360

Height of unit, mm700

Weight of unit, kg80