ROSTA Screen Mounts Long-life Suspensions for Screens and Shaker Conveyors

    ROSTA Oscillating elastic suspensions for all types of screening Oscillating Mountings Rocker arms and drive heads for crank shaft driven shaker conveyors – maintenance-free and long lasting guide arms for shakers – resilient rod heads for alternating loads Spring accumulators for natural frequency shakers – for the powerful, harmonic actuation of feeders – energy-saving and silent power packs Double rocker arms for high speed shaker conveyors – 1 : 1 mass balancing, reaction neutral suspensions – high dynamic spring rates for natural frequency systems

Oscillating Mountings machines and shaker conveyors Vibration absorbing mounts for circular and linear motion screens – long lasting – high isolation degree – corrosion-resistant – overload-proof maintenance-free, long lasting, noiseless, corrosion-resistant and overload-proof for all oscillatory equipments and machinery Universal joint suspensions for gyratory sifters – long lasting articulations for guiding horizontal gyrations – offering extremely high supporting force, up to 40'000 N per mounting

Selection table for free oscillating systems (with unbalanced excitation) One mass system circular motion screen Oscillating Mountings One mass system linear motion screen Two mass system with counterframe One mass system linear motion screen hanging Oscillating Mounting – universal mounting. High vibration isolation and low residual force transmission. Natural frequencies approx. 2–3 Hz. 9 sizes from 50 N to 20’000 N per AB. Oscillating Mounting for impact loading and high production peaks. (Heavy Duty) Natural frequencies approx. 2.5–3.5 Hz. 6 sizes from 500 N to 14’000 N per AB-HD. Oscillating...

Selection table for guided systems (crank driven) One mass shaker “brute-force” system One mass shaker “natural frequency” system Two mass shaker “fast-runner” system with reaction force-compensation Single Rocker with adjustable length. Single Rocker with decided center distance. 6 sizes up to 2’500 N for flange fixation. 6 sizes up to 2’500 N for central fixation. Oscillating Mountings Models with right-hand and left-hand threads. 7 sizes up to 5’000 N per rocker suspension. Double Rocker with decided center distance. 5 sizes up to 2’500 N for flange fixation. 4 sizes up to 1’600 N for central...

Technology of free oscillating systems with unbalanced excitation Oscillating Mountings Introduction Free oscillating systems are either activated in using exci­ers, t unbalanced motors or unbalanced shafts. The oscillation amplitude, type of vibration and the direction of vibration of the screen are determined by the dimensioning and arrangement of these actuators. The excitation force, the angle of inclination of the excitation, the inclination of the screen-box and the position of the center of g ­ ravity determine the resulting oscillation amplitude of the device. The oscillation amplitude,...

Linear motion screens Linear vibrating screens are preferably mounted on ROSTA oscillating mountings type AB or AB-HD. Depending on the positioning of the exciter on the screening frame, the feed-end: discharge-end load distribution can be different. The feed-end side is normally lighter, as the exciters are positioned close to the discharge-end and thereby pull the material through the screening frame; in many cases, the feed-end: discharge-end distribution is thereby 40% to 60%. In the interest of an even suspension, it is thereby recommended to mount the screening frame on six or more ROSTA...

conveying direction Design layout and evaluation Subject Mass of the empty channel and drive • Example Unit of which approx. 50 % coupling * Total vibrating mass * Mass distribution: feed end discharge end Acceleration due to gravity Load per corner feed end Load per corner discharge end Calculation formulas • Element choice in example Oscillating stroke empty channel Oscillating stroke in operation Motor revolutions Centrifugal force of both drives Oscillating machine factor Machine acceleration • Natural frequency suspensions fe Oscillating stroke (Amplitude peak to peak) Working torque of...

Technology Determination of the average material conveying speed vm Main influencing factors: – Conveying ability of the material – Height of the bulk goods – Screen box inclination – Position of unbalanced motors – Position of the center of gravity 53 32 Diagram for angle of inclination β = 45° to the horizontal Resonance amplification and continuous running Laboratory measurements of a typical development of the residual forces on a ROSTA screen suspension: vertical force continuous running The horizontal line out of the intercept point of stroke (7.7 mm) and motor revolutions (960 rpm) is...

Compression load AB-HD The deflection values are based on our catalogue specifications and should be understood as approximate values. Please consult also our tolerance specifications in chapter “Technology” in the general catalogue. Final element deflection = s x 1,09 Diagrams showing the vertical deflection s (in mm) by compression or tensile load G (in kN). The shown values comprehend the initial cold flow settling after one day of operation. The final element deflection after the full cold flow compensation (after approx. 1 year) is usually factor x 1,09 higher (depending on specific application,...

Oscillating Mountings Type AB G Load capacity Gmin. – Gmax. [N] B* B A* A max. unmax. unloaded load loaded load Capacity limits by different rpm Dynamic spring value Natural frequency Gmin. – Gmax. [Hz] Values in nominal load range at 960 rpm and sw of 8 mm These types can be combined with one another (identical heights and operation behaviour) Material structure * compression load Gmax. and final cold flow compensation (after approx. 1 year). ** eparate assembly instructions are available, please ask for details. s Oscillating Mountings ROSTA blue painted Nodular cast iron Steel welded construction...