What is the purpose of a shaft?

What is the purpose of a shaft?

A shaft is a rotating machine element, usually circular in cross section, which is used to transmit power from one part to another, or from a machine which produces power to a machine which absorbs power.

What is a tunnel shaft?

: a narrow watertight compartment through which the propeller shaft of a ship passes from the after engine-room bulkhead to the stern tube.

Why is it important for shaft tunnel to be watertight?

The tunnel must be watertight to ensure integrity should the shaft seal cease to operate correctly. The forward end of the tunnel is fitted with a sliding watertight door to seal off the tunnel if necessary. The structure is made to be capable of withstanding the water pressure should the tunnel become open to the sea.

What is a shaft in excavation?

Shafts are the doorways to the underground tunnel, serving as the location at which all material enters and exits. They vary in size and depth, and their design and construction are key to the successful completion of any tunnelling project.

What are the advantages of shaft mining?

So what about the benefits?

• Shaft mines can extended the deepest.
• One of the easiest ways to obtain coal and other materials buried deep underground out of reach for surface mining.
• As seen in the area, mining creates many jobs.It also brings people to places with lower populations.

What are shafts and how are they useful in shaft mining?

use in mining The principal means of access to an underground ore body is a vertical opening called a shaft. The shaft is excavated, or sunk, from the surface downward to a depth somewhat below the deepest planned mining horizon.

What is the difference between a shaft and a tunnel?

Shaft: a long, narrow, typically vertical hole that gives access to a mine, accommodates a lift in a building, or provides ventilation. Tunnel: an artificial underground passage, especially one built through a hill or under a building, road, or river.

How are shafts classified?

Shafts are mainly classified into two types: Transmission shafts are used to transmit power between the source and the machine absorbing power. e.g., countershafts, line shafts, and all factory shafts. Machine shafts are an integral part of the machine itself.

What’s the difference between a tunnel and shaft?

How water ingress through the shaft tunnel can be prevented?

The rubber seal sandwiched by the propeller hub and protective bronze liner, prevents ingress of sea water which would act as an electrolyte to promote galvanic corrosion of the exposed part of the shaft. A defective seal permits corrosion and wastage.

What are the advantages of a shaft headgear?

Headgear provides a strap that goes behind the neck or head to apply this pressure. Speeds Up Treatment Time – Lastly, one of the major benefits of headgear is that it can speed up treatment in cases that may otherwise be complex and time-consuming to treat.