Mechanical Seminar Topics Ppt
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The vacuum brake was, for many years, used in place of the air brake as the standard, fail-safe, train brake used by railways. Pneumatic braking systems use compressed air as the force used to push blocks on to wheels.The vacuum brake system is controlled through a brake pipe connecting a brake valve in the driver’s cab with braking equipment on every vehicle.A vacuum is created in the pipe by an ejector or exhauster. The ejector removes atmospheric pressure from the brake pipe to create the vacuum using steam on a steam locomotive, or an exhauster, using electric power on other types of train. With no vacuum the brake is fully applied.
The vacuum in the brake pipe is created and maintained by a motor-driven exhauster. The exhauster has two speeds, high speed and low speed.
The high speed is switched in to create a vacuum and thus release the brakes. Slow speed is used to keep the vacuum at the required level to maintain brake release. Vacuum against small leaks in the brake pipe is maintained by it. Driver controls the brake using this. It has the following positions: “Release”, “Running”, “Lap” and “Brake On”.”Neutral” or “Shut Down” positions are also available which locks the valve out of use. He “Release” position connects the exhauster to the brake pipe and switches the exhauster to full speed. This raises the vacuum in the brake pipe as quickly as possible to get a release.
The exhauster keeps running but at its slow speed in the “Running” position. This ensures that the vacuum is maintained against any small leaks or losses in the brake pipe, connections and hoses.”Lap” is used to shut off the connection between the exhauster and the brake pipe to close off the connection to atmosphere after a brake application has been made.”Brake On” closes off the connection to the exhauster and opens the brake pipe to atmosphere. Categories. (6). (4).
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Seminar Topics Pdf
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