Hydraulic cranes

Working of hydraulic crane

1. Hydraulic Cranes Submitted by- 130094 130095 130096 130097 130098 130099 130100

2. Introduction The hydraulic crane is used for transferring or lifting heavy loads. It can lift loads up to 2500 kN. It is widely used in loading and unloading in ship, warehouses, workshop, heavy industries and dock sidings.

3. Parts of hydraulic crane Hollow vertical post or mast Tie Jib Guide pulley Jigger

4. Fig.1 : Hydraulic Crane

5. Tie & Jib The jib and tie are attached to the vertical post . Jib is hinged near the foot of the vertical post . Jib can be raised or lower in order to change the radius of action.

6. Jigger 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. ` Fixed pulley Movable pulley Sliding Ram cylinder Jigger

7. Fig. : Real view of jigger

8. Ropes 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.

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

10. Working The pressurised water forces the sliding ram to move right with movable pulley bock.

11. Working So that the distance between two pulley blocks increases

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

13. Working For lower the load, close inlet valve and open outlet valve So that water is forced out the cylinder hence ram moves towards the left So the distance between two pulley blocks decreases Which release the wire rope and the load is lowering down

14. Application Hydraulic crane used for loading and unloading of ship and Railway wagons and heavy industries.

15. Advantages and Disadvantages Advantages Cheaper. Easy to operate Construction is simple. Disadvantages Carrying capacity is less than the electric crane. Lifting speed is low, Modern hydraulic crane has an lifting speed of about 75 m per minute.

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