User:Vinay.nitk

DOZERS

Introduction A dozer consists of a large vertically curved steel blade mounted at fixed distance in front of a tractor ,secured by arms on a pivot or shaft near the horizontal centre of the crawlers or wheels and the blade itself cn be lowered or pushed or tilted The operating weights of the dozer are            21,100kg,33,460kg,44,900kg.

Classification of dozers

Dozers can be classified as Wheel-mounted dozers Crawler-mounted dozers On the basis of operating unit used Dozer with cable operated blade Dozer with hydraulically mounted blade

Types of dozers There are six different types of dozers namely Straight or bull dozers Angle dozers Tilt dozers Push dozers U-shaped dozers Brush or rock rakes dozers

1.The straight dozers: the straight dozers are conventional dozers with cutting edge and blade at the right angles to the longitudinal axis of the tractor. The blade can be lowered, raised and slightly tilted but cannot be angled

2.Angle dozers: the angle dozers are those in which the blade can be turned at a particular angle to the direction of the travel which in turn states that the cutting edge and the blade are at a particular defined angle to the longitudinal axis of the tractor.

3.Tilt dozer: the tilt dozer is a modification of the straight dozer has blade which can be pitched through vertical arc of a few degrees when the top of the blade is pitched to the rear

4.Push dozer: the push dozer has a blade which has been reinforced at the centre with heavy steel plate. the shape and size of the blade is such that the rear types of the unit being pushed U-shaped blade dozer: the name itself states the blade is modified and designed such that it is in the u-shape to cater specific needs

Components of the dozer

A dozer consists of the following components namely 1.Blade 2.Arms 3.Undercarriage unit 4.Transmission system 5.Operation system

Blade

It is a rectangular base and the back structure with knife edge riveted to the bottom part. The edge is usually of three pieces a wide centre and two corners which are bolted The body is a steel structure and the edge which projects is made of hard steel. Dimensions are around 4260X1060mm,3460X1280mm

Arms

Arms provided to the dozers are of two types they are 1.push arms 2.pitch arms Push arms: these are heavy hollow beams connected from the hinge points of the body to the bottom of the blade. they are usually mounted on the outside track frame, however there are some designs where the frames are fixed inside of the track frame