• CRADLE TO GRAVE
In bulk handling, the rolling and colliding loosen aggregate and assist particles through the grate.
Linear up-and-down motion is highly effective for sand biofiltration and particulate dewatering. With vibrators mounted on rails above the material flow, the internal weights lift and drop a specialised screen made of durable fine mesh. This motion causes the separation of particulates from the screen. With each cycle, air is introduced between the particulates, and water is forced out, allowing only moisture and particles microns in size to pass through.
Both units are highly effective in punishing industrial constant-duty environments. The low-maintenance components ensure longlasting performance and peace of mind, backed by an industryleading 3-year warranty.
A well-designed screening system is extensively tested in many applications to find deficiencies.
Hydraulic vibrators set on a sand dewatering screening system delivering linear motion.
Elliptical rotational motion is prominent in agriculture for the threshing process, but also in recycling and bulk processing. Set in front of or behind the screen, the action causes the material to move forward, then back, using the screen as a tool to not only separate, but also, in the case of grains, remove the husk from the seed. This“ cheese grater” effect also helps remove loose dirt from quarried rock and fines from mined raw material.
Electric and hydraulic screen vibrators The weight and volume of the bulk handling environment require a powerful vibrator to do the job effectively. While electric screen vibrators are common, hydraulic vibrators are more applicable for portable screen applications where no electricity is available. The movement of a hydraulic screen vibrator is driven by a hydraulic pump that delivers pressurised fluid to the motor. The motor then converts the fluid power into rotational motion, which is transferred to eccentric weights. Eccentric weight is a rotating mass that is offset from the centre of rotation, creating an unbalanced force. Industrial electric vibrators for material screening should use inverter-duty rated and Class H insulated windings to prevent overheating in continuous-duty environments. Martin ® Engineering’ s Screen Vibrators produce up to 16 500lbs( 7 483kg) of centrifugal force. The adjustable eccentric weights tailor performance for 3- or 4-panel screens, featuring low-maintenance, greaseable, long-lasting cylindrical roller bearings. The highstrength cast aluminium cases are IP66 rated for dust and water protection, with available explosion-proof models that bear the cETL, ATEX, and IECEx marks for use in hazardous locations.
An example of a hydraulic screen vibrator is the Martin ® Hydraulic Screen Vibrator, which provides up to 8 300lbs( 3 855kg) of centrifugal force for efficient material separation. The IP66 enclosure ensures a dry and grit-free internal environment and uses the same mounting bolt patterns as electric vibrators.
As we’ ve demonstrated, proper vibration is essential, but it is also a wear part, so high-quality, durable equipment is vital to prevent excessive downtime. Along with a solid guarantee, the equipment manufacturer or representative should be responsive and able to provide a replacement quickly.
A well-constructed system, along with proper calibration and placement of vibrators for the application, is essential for efficient and optimised screen separation. To further extend the equipment’ s life, these systems should be easy to maintain and accessible, ensuring both workplace safety and lower operational costs. •
References:
1. B. Ramatsetse, K. Mpofu, O. Makinde, et al; Design And Structure Optimization Of A Reconfigurable Vibrating Screen For The Mining And Mineral Processing Industries. Tshwane University of Technology. New technology and innovation in the Minerals Industry Colloquium, Southern African Institute of Mining and Metallurgy, Emperors Palace, June 2016.
2. T. Linhares, A da Silva Scari, C. Vimieiro; Causes Of Failures In Vibrating Screens: A Literature Review. Minerals Engineering, Volume 218, November 2024
About author: Susie is an experienced Business Development and Marketing specialist at Martin Engineering USA, where she plays a key role in driving strategic growth initiatives.
36 • African Mining • April 2026 www. africanmining. co. za