27-06-2014, 12:05 PM
MECHANICAL WORKSHOP
MECHANICAL WORKSHOP.pptx (Size: 377.88 KB / Downloads: 23)
INTRODUCTION
Indian Railway is a department owned and controlled by the Govt.of India,via the Ministry of Railways.
Indian railway is divided into various zones,which are further divided into divisions.
Gorakhpur is the zonal headquarter of the North Eastern Railway zone.
The formal inauguration ceremony of IR was performed on 16th April 1853 with the first passenger train steamed out of Howrah station destined for Hooghly, a distance of 36 km .
PRACTICAL TRAINING UNDER NER
We have received the scheduled Summer Practical Training as a part of our curriculum, from 15th June to 5th of July, 2012 under Mechanical workshop North Eastern Railway, Gorakhpur.
I have done my summer training under guidance of MR. H. P. Yadav, MR. R. P. Yadav and MR. Molai Prashad.
We've studied about the following mechanical part
BREAKING SYSTEM
Types of brakes
Vacuum brake,
Air brake.
Air Brake
Brakes are the devices,which are basically used to control the speed of machine part or decreases its speed or maintains the uniform or rest by working against the forces or couples working over the machine part.
Air brakes is the new method of breaking system that is far more sufficient than the vacuum breaks.
Mainly the brakes are made by gray cast iron .
Cont.
The vast majority of the world's trains are equipped with braking systems which use compressed air as the force to push blocks on to wheels or pads on to discs. These systems are known as "air brakes" or "pneumatic brakes". The compressed air is transmitted along the train through a "brake pipe". Changing the level of air pressure in the pipe causes a change in the state of the brake on each vehicle. It can apply the brake, release it or hold it "on" after a partial application. The system is in widespread use throughout the world.
"triple valve", so called because it originally comprised three valves - a "slide valve", incorporating a "graduating valve" and a "regulating valve". It also has functions - to release the brake, to apply it and to hold it at the current level of application. The triple valve contains a slide valve which detects changes in the brake pipe pressure and rearranges the connections inside the valve accordingly. It either:
recharges the auxiliary reservoir and opens the brake cylinder exhaust,
closes the brake cylinder exhaust and allows the auxiliary reservoir air to feed into the brake cylinder
or holds the air pressures in the auxiliary reservoir and brake cylinder at the current level.