CREEP SPEED: A very slow, constant, continuous, fixed rate of motion of the hoist, trolley, or bridge: usually established at 1% to 10% of the normal full load speed.
How fast is a crane?
How Far? When migrating, Whooping Cranes can fly at speeds of anywhere from 60 – 80 kilometres per hour (kph) or more. If they have a tail wind, the birds can reach speeds of over 100 kph. Daily distancess average around 400 kilometres and the birds stay aloft for 7 or more hours.
What is LT and CT in Crane?
LT motion : Long Travel Motion. CT motion : Cross Travel Motion. Bridge : the structural portion on which the trolley/crab moves. LT End carriage : Structure which houses Long Travel Wheels. CT End carriage : Structure which houses Cross Travel Wheels.
How is hoist speed calculated?
Most hoist motors are rated for 15 minute continuous operation. By dividing length of lift by lifting speed in feet per minute, you can determine if you have exceeded this rating. If there is any doubt, contact CraneTec. On two speed hoists, the slow speed is generally one-fourth the hoist main speed.
How many types of EOT crane are there?
There are various types of EOT (electric overhead travel) cranes 1. Single Girder EOT Crane 2. Double Girder EOT Crane Single Girder EOT Crane – Sparkline manufactures and supplies a wide range of single girder EOT cranes in various configurations according to customer requirements.
What eats a crane?
In the United States, animals such as raccoons, fox, and bears may prey on the eggs or young. Wolves prey on unfledged whooping cranes at Wood Buffalo National Park. Adult cranes can usually escape these predators, but cannot escape large birds of prey such as golden eagles.
Where do Cranes sleep at night?
Most species of cranes sleep at night standing on the ground. They generally prefer to stand in shallow water, often on one leg, with their heads and necks tucked on or under one of their shoulders. In the breeding season cranes will sleep at or near to their nests so they can guard their eggs or chicks.
What is full form of EOT crane?
Electric overhead traveling crane or EOT crane is one of the most common types of overhead crane, or called bridge cranes, which consist of parallel runways with a traveling bridge spanning the gap.
Which motor is used in EOT crane?
While series DC motors consume more power than PMDC motors to produce their electromagnetic field, they’re powerful, efficient at high speeds and produce the most torque; hence, they are used for heavy duty winches. Shunt DC motors are used in constant speed applications, 18 such as reel drives.
What is crab in EOT crane?
The lifting crab of a EOT crane is an independent two motion machine and consists of the hoist machinery built on to a frame, which is mounted on runner wheels, and driven by a motor through suitable gearing. The crab is also known as trolley. … The motion of the crab is derived from an electric motor.
What is CDF in motor?
Cyclic duration factor : (CDF) : The ratio between the period of loading including starting and electric braking and the duration of the duty-cycle expressed as percentage. … D.C. Injection braking : A form of braking of an induction motor in which a separate dc supply is used to magnetise the motor.
How do I know what power my engine needs?
Calculating Mechanical Power Requirements
For linear motion, power is the product of force multiplied by the distance per unit time. In the case of rotational motion, the analogous calculation for power is the product of torque multiplied by the rotational distance per unit time.
How does a mine hoist work?
Friction hoists are mounted on the ground above the mine shaft, or at the top of the headframe. Friction hoists utilize tail ropes and counterweights and do not have the haulage rope fixed to the wheel, but instead passed around it.
How does EOT crane work?
EOT Crane Working Principle
1. … The ring gear of drum transmit driving force to drum set, then through wire ropes and pulleys drive crane hook up and down, so as to finish the lifting of the heavy objects up and down. 2. Transmission of crane Trolley traveling system: the driving force of crane trolley is from motor.
What is Bay length of EOT crane?
Scope: Design, manufacture, Erection, Commissioning, Trial run and supply of 3 TON capacity electrically operated overhead travelling crane conforming to IS: 807, 3177 & 3938 tested to 25% overload with a span 18 meters, Lift 7.5 meters and bay length 28 meters and as per the detailed specifications in the annexure. E.
What is DSL in EOT crane?
Direct Supply Line (DSL) refers to Angle Iron bus bars, supported on insulators, arranged length wise, at a safe height, in open to provide electric supply to EOT (Electric Overhead Travel) Cranes.