The tap sieve, also known as tapping standard sieve shaker, is a special sieving equipment used for powder particle size classification and particle size testing in laboratories and small-batch production. It is mainly applicable to fine particle and powder materials in abrasives, geology, chemical, pharmaceutical, building materials and other industries. Its core operation relies on the compound motion of horizontal reciprocating swing + vertical tapping vibration, which makes materials fully disperse and pass through the sieve mesh to achieve efficient and accurate classification.
The equipment consists of a motor, transmission mechanism, eccentric wheel, tapping mechanism, sieve frame bracket and multi-layer standard sieve frames. During operation, the motor drives the main shaft to rotate through gears and transmission belts. The eccentric mechanism on the main shaft converts rotary motion into horizontal reciprocating swing of the sieve body, spreading materials evenly on the sieve mesh surface and moving them forward. Meanwhile, the main shaft drives the cam and ejector rod mechanism, enabling the upper hammer to deliver periodic and high-intensity vertical tapping on the sieve frame to generate instantaneous impact force.
Under the combined effect of reciprocating swing and vertical tapping, materials keep rolling and jumping. It avoids material accumulation and agglomeration, and effectively prevents fine particles from blocking the sieve pores. Fine powder smaller than the sieve pore size smoothly passes through the mesh into the lower sieve frame, while coarse particles larger than the pore size remain on the corresponding sieve layer. After gradual screening by multi-layer sieves with different pore sizes, materials are accurately separated according to particle diameter.
The equipment is usually equipped with a time control device, which can set the sieving time according to material characteristics. It will stop automatically when the set time is reached, ensuring the consistency and repeatability of test results. Featuring compact structure, stable operation, strong sieving force and high precision, the tap sieve is especially suitable for fine powder, micro powder and viscous materials that are difficult to screen by ordinary vibrating sieves, serving as a commonly used device for particle size detection and classification.
