Hydraulic Cranes

By Bhavesh Patwa (116120319007)Mukesh Marvadi (116120319008)

Branch: Mechanical Engineering

Dr. S. & S.S. Gandhi College of Engineering and Technology

Outline

• Introduction

• Construction • Working

• Application

Introduction

• The hydraulic crane is used for transferring or raising heavy loads.

• It can be used up to loads 2500 kN.• It is widely used in loading and unloading

ship, warehouses, workshop, heavy industries and dock sidings.

Construction

Parts of hydraulic crane

• Tie• Jib• Guide pulley• Jigger• Hollow vertical post

Construction

• The jib and tie are attached to the vertical post .jib is hinged near the foot of the vertical post .

Construction

• Hydraulic jigger consist of a movable ram sliding in a fixed cylinder . The sliding ram , one end is connected to set of movable pulley block and other end is contact with water.

Construction

• One end of wire rope fixed with cylinder body is taken round all the pulley of the two sets of pulley and at the end passes round the guide pulley block.

• The free end of the wire rope is attached with a hook for suspending the load.

Working

During the lifting the load by crane, the high pressure water is admitted into the fixed cylinder of jigger.

Working

The pressuriesed water forces the sliding ram to move right with movable pulley bock.

Working

So that the distance between two pulley blocks increases

Working

Which causes the wire passing over the guide pulley is pulled by the jigger and hence the load attached to hook is lifted.

Working

For lower the load, close inlet valve and open wast valve so that water is forced out the cylinder hence ram moves towards the left and distance between two pulley blocks decreases, which release the wire rope and the load is lowering down

Application

• Hydraulic crane used for lowering workshop, foundary, loading and unloading of ship and Railway wagons and heavy industries.

Thank You…