The above picture shows the “Electric Rope Shovel”

Hydraulic accumulator holds/stores hydraulics fluid at high pressure.

Solar energy is a thermal prime mover.

The belt transmits power by friction only whereas chain drives transfer speed and torque through the use of a linked chain and sprockets. Chain drives are well suited for this task because the sprocket teeth and chain setup results in a positive speed ratio and the ability to transfer a large amount of torque within a compact space.

The power transmitted by belt drive depends on the following factors

• The linear velocity of the belt
• Tension under which the belt is placed on the pulleys
• The contact area between the belt and the smaller pulley. The contact area is measured by measuring the arc of the contact between the belt and the pulley

When belt slips, the driven pulley does not rotate in the same rpm as the driving pulley.

Thus there is to reduction in the velocity ratio of the system. As the slipping of the belt is a common phenomenon, thus the belt tension should monitored and adjusted to maintain required velocity ratio.

It is the ratio between the velocities of the driver and the follower or driven. Let d₁ = Diameter of the driver, d₂ = Diameter of the follower, N₁ = Speed of the driver in r.p.m N₂ = Speed of the follower in r.p.m therefore, Length of the belt that passes over the driver, in one minute = π d₁.N₁ Similarly, length of the belt that passes over the follower, in one minute = π d₂ . N₂

Since the length of belt that passes over the driver in one minute is equal to the length of belt that passes over the follower in one minute, therefore π d₁.N₁ = π d₂ . N₂ Therefore, Velocity ratio, N₂/N₁ = d₁/d₂.

The rolling friction reduces wear and frictional power loss and improves the efficiency of chain drive

An antifriction bearing, also known as a rolling contact bearing. In rolling contact bearings, the contact between the bearing surfaces is rolling instead of sliding as in sliding contact bearings. Due to this low friction offered by rolling contact bearings, these are called antifriction bearings.

Shaft used in machinery is generally made up of Steel. It provides desired strength as well as prevents from rusting unlike wrought iron.