Touch Down Grab Bucket
Touch Down Grab(Mill Scale Grab) Single rope operated Clamshell BucketOperation cycle: - Grab in open condition to be lifted from unloading point. After reaching loading point, operator lowers the grab onto material. After grab touches the material, operator has to release the rope. Operator has to lower the rope so at one point the touch down mechanism releases the latch which holds the grab buckets with the top pulley block. Operator then have to tighten the rope so grab starts closing. After grab closes completely, operator has to tighten the rope so grab will be lifted along with material inside. Operator as to lower the grab where material is to be unloaded. After touching ground, operator has to lower the rope slightly so the latch will release the buckets from top pulley block. Operator has to tighten the rope so grab will start opening & material will be unloaded. This cycle is to be repeated.
Rehandling Clamshell Grab Bucket (Mechanical Operation)
ü Operation - Two wire / Three wire / Four wire Mechanical.
ü Wear Plates/ Tooth points - Steel cast Cr-Mn on bottom face of Grab and fixed to bucket with HT CSK bolts.
ü Materials for Construction –All Plates & Flats - IS 2062: 2011 (Grade E350). All Shafts & Pins – EN 24 Hardened & ground. Bushes - PB (IS 7811-1986). Wire rope pullies - IS 1030: 1998 grade 280-450W, rope grooves flame hardened. Pullies will be provided with sealed ball bearings for dry working For wet working these will be with PB bushes.
ü All welded parts will be stress relieved and shot blasted before painting.