Design of screw jack Y. Mohan S S Ram.

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Presentation transcript:

Design of screw jack Y. Mohan S S Ram

Screw jack A screw jack is a portable device consisting of a screw mechanism used to raise or lower the load Jack is simple and widely used device They are 2 types of jacks Hydraulic jack(cylinder and piston mechanism) mechanical (hand operated)

Applications of screw jack Paper, press, printing industry Gypsum factories Sheet metal forming machinery Mechanical lifting applications Platform lifting applications Food processing machinery Construction sector Bridge jacks for road and bridge lifting Shipyards Opening and closing of penstocks Industrial process Roll form machinery Mining industry Defence industry Lift tables Stage setup applications

In screw jack applications, the hazards are dropping, tipping or slipping of machines or their parts during the operation. The main reasons Jack is overloaded Load is improperly secured on the jack Jack not placed on hard and level surface Jack is used for a purpose for which it is not designed Proper size ,strength and stability are essential requirements for the design of the screw jack

Construction of screw jack Name of component material Frame Grey cast iron Screw Steel 30c8 Nut Phosphor Bronze Grade-1 Handle Cup Set screw Commercial steel washer

Inner diameter(D1), Outer diameter(D2) and thickness of the nut collar

The cup fitted with a pin of diameter Diameter of head D3 = 1.75 do The cup fitted with a pin of diameter D4 = D3/4

Buckling