Roller RESCUER of unary Ø 35/27 mm of AL of 13 kN
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- Year2013
The block roller for relief of efforts on a raising of freights and increase of the efficiency (E) in polispastny systems.
It is used with ropes diameters to 14 mm.
At long-term use with steel cables production of special hummock rollers under the concrete diameter of a cable is necessary.
For improvement of sliding on axes and increases in efficiency all rollers of TM Krok are completed with swing ball-bearings. And only small rollers with a diameter of 35 mm and less for increase in loading capacity instead of the rolling bearing can be completed with modern bearings of sliding.
In general, the efficiency of rollers increases with increase in internal diameter of a stream of a pulley of a roller, reduction of friction of swing and reduction of tension of a bend of a working cable (rope). And the size of the last depends on a ratio of diameter of a cable to diameter of a pulley, rigidity of a cable, an arrangement of locks and, even, on a pulley flute profile. For determination of efficiency it is necessary to find experimentally a ratio of mass of the lifted freight to traction effort. For the same roller when using different cables of efficiency it will be various. Therefore the categorical statement that some block has such efficiency without indication of other conditions, no more than advertizing course (as, for example, that new medicine is so many percent more effective than former).
Pulleys and cheeks of block rollers are made of steel or of a high-strength aluminum alloy, and an axis — of the high-alloyed thermoprocessed steel.
For reduction of resistance of twisting of a cargo rope (a cable or a rope) it is necessary to fix the lifted freight to a cargo rope via the swivel.
It is necessary to remember that at a freight raising through an unary blochyok, to the place of fastening of the block roller to anchor knot the DOUBLE force of mass of freight works!
- Rated load: 10 kN
- Maximum load: 13 kN
- Weight: 80 g
- Diameter of a roller external/internal: 35/27 mm
- Roller thickness: not less than 14 mm