For Thai mining and cement engineering companies, choosing Suma ASNU40–ASNU60 in the critical lift sections is essentially a backstop system upgrade: it improves safety margins during shutdowns and significantly reduces downtime caused by backstop failure. As a result, more design institutes now specify ASNU directly in the bill of materials at the design stage, turning the heavy-duty one-way clutch from a small accessory into a key element of the drive solution.In Thai quarries and cement plants, inclined belt conveyors are standard equipment, but many site owners share the same headache: whenever there is a sudden power outage or an emergency stop, the belt runs backward, and tons of material rush down the slope. This not only causes serious spillage, but can also overload the tail pulley, gearbox and support structure. Traditional solutions combine a ratchet mechanism with a standard deep groove ball bearing. Under heavy dust and frequent shock loads, the pawls wear quickly, backlash increases, and the backstop becomes unreliable “consumable hardware”.

To cope with these heavy-duty and high-shock conditions, we recommend using Suma ASNU series roller-type one-way clutch bearings for Thai engineering companies. This range comes with an integral inner race; typical sizes such as ASNU40, ASNU50 and ASNU60 cover the common 40–60 mm shaft diameters used on slope conveyor drives. A full complement of rollers works between the inner and outer raceways, providing a large contact area and lower surface stress, which is much better suited to absorbing the high impact torque that occurs when the belt stops. The outer race is mounted directly in the housing, providing both radial support and backstop function, without the need for bulky external ratchet mechanisms.

In a real project, a Thai quarry retrofitted several key conveyors: the tail and intermediate incline drives were standardized to Suma ASNU series. Only minor changes to end covers and housings were required to fit the new bearings. After the upgrade, the belt may still move slightly during deceleration, but is quickly locked by ASNU, and the dramatic “full-length reverse run” almost disappeared. The maintenance team reports that the housing structure is simpler, daily inspection focuses on lubrication and clearance of the ASNU bearings, and spare parts management has been streamlined from a mix of ratchets and bearings to just a few fixed Suma models.