The harp screen, also known as the piano wire screen, is formed with a single face of highly tensioned wires. The harp screen’s wires are connected at both ends and feature a metal hook. The long wires are tightly grasped by a transverse band in the harp screen at a great distance. This procedure ensures that the screen also produces its discordant frequency in addition to the screening device’s vibrations. This prevents screen meshes from being clogged or plugged.
The wires, either straight or crimped, are protected with some wide-area cross supports in harp screens. Because of the material to be screened and the force of the screening machine, each wire becomes agitated. The extra vibrations generated throughout the procedure reduce the possibility of sticking, blindness, or pegging.
Harp screens for Your tasks
With your mobile screening plant, Harp screens are ideal for screening fines and other rigid materials. This screen media is continuously being the most efficient and productive globally, and it solves more difficulties than not when it comes to damp and sticky materials.
Harp screens, on average, screen 80 percent more than similar aperture woven wire mesh, resulting in more tonnes per hour of production. Harp screens have extremely low material build-up since there are no cross-wires and thus no corners for particles to accumulate. The diameter of the wire is often lower than that of wire mesh, resulting in less surface area for particles to adhere to.
If you’re screening challenging materials using woven wire mesh, you can be experiencing screen blinding and pegging. Consider utilizing a harp screen to get a more efficient result with sticky and moist aggregate. Unlike woven mesh, harp screens are composed of individually tensioned wires that run straight and hook to hook.
During the screening process, these wires move independently and cut through the material, resulting in increased output rates and a higher proportion of open space.
There are situations when a harp screen isn’t necessary, such as when massive materials fall straight on the harp.
Because they are not meant for impact, you will need to remove the oversize goods or have protection from the above deck. Long flat pieces can result in oversize the finished product depending on what material you’re screening and your product sizing needs.
The harp screen must be fitted appropriately to provide the most extended life from the screen, which means the tension bar must be into the back of the hook before tension, and the profiles must be correctly placed onto the stringers. Recheck the screen tension after four to six hours of use from installation and make any required adjustments.
Most screen tension changes are made within the first two weeks of use. Because of their manufacture and use, wire screens will stretch and lose their initial tension. These screens’ tension should be checked regularly.
The hooks are built to last while still being simple to install. Plastic profiles are available in a round shape to fit over round top capping rubber or a square profile to fit directly over your stringer rail. Because the wire used to make Harp screens has a higher carbon content (about 30%) than conventional woven mesh, it has the most extended wear life. The highest production screens on the market are harp screens.