What is creep speed in hoist?
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.
What is inching on a crane?
Inching provides a way to approach a load destination with great accuracy. It allows the operator to make small inching movements one-by-one. When the joystick movement is activated, the load will move only the predefined distance. If the joystick is released during the inching movement, the load immediately stops.
What is hoist speed?
Lifting speeds are generally of the range 0.5 mtr/min to 15 mtr/min. It should be very critically handled as a little bit of carelessness might lead to hazards and accidents in the industries. The speed of the hoists depends on the weight of the materials to be lifted, i.e., the lifting capacity.
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?
Lift speed is usually expressed in m/sec (metres per second). Platform Lifts under the Machinery Directive are limited to a maximum speed of 0.15m/sec (150mm per second). In order to calculate the time that the lift will take to complete a single journey you will need to divide the total lift travel by the speed.
What is long travel in crane?
Motions of an EOT Crane – Hoisting Motion Travel is used to take the hoist up and down. Cross Travel: – Cross travel is used to take the hoist left or right. Long Travel: – Long travel is used to take the crane forward or backward.
How fast can a crane move?
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.
What is span of crane?
The crane span is the measured center-to-center distance between the runway beams. An overhead crane’s span is essentially its width across the bay—or the measured center-to-center distance between the runway beams.
What is fall in crane?
Concerning crane suspended loads, OSHA states that the fall zone is considered to be “the area (including, but not limited to, the area directly beneath the load) in which it is reasonably foreseeable that partially or completely suspended materials could fall in the event of an accident.” Although OSHA does not limit …
How do you calculate lifting torque?
To calculate load torque, multiply the force (F) by the distance away from the rotational axis, which is the radius of the pulley (r). If the mass of the load (blue box) is 20 Newtons, and the radius of the pulley is 5 cm away, then the required torque for the application is 20 N x 0.05 m = 1 Nm.
What is number of falls in crane?
3: Main hoisting line falls -The main hoisting line of this crane has six falls, which means that each fall supports 1/6 of the lifted weight, so the crane’s wire diameter would be smaller than in the case of a single lifting wire, supporting all the tensions.
What is the full form of EOT?
From Wikipedia, the free encyclopedia. Electric overhead traveling crane or EOT crane is one of the most common types of overhead crane, also called bridge cranes, which consist of parallel runways with a traveling bridge spanning the gap.
What is the starting frequency of a hoist operation?
1 SN ET02 (1)Max. starting frequency The starting frequency is the cumulative sum of the inching operation count, so this must be calculated by estimating the number of inchings per hoist round trip. (Starts/h)=2 n N Example calculation
What is the speed of a standard lift hoist?
Standard Lift Hoisting Speed (m/min) Motor Output (kW) Link Chain Dia. (mm) No. of Rating Power Cord Length 3(6) 10 0.45 50Hz 50Hz 60Hz 60Hz 6.3 1 7.2 0.63 6.3 1 4.6 0.8 7.1 1 2.3 0.8 7.1 2 1.5 0.8 7.1 3 0.9 12 8.5 5.5 2.8 1.8 1.1 0.55 0.75 1.0 1.0 1.0 1.0 0.8 7.1 5 30% ED 25% ED 5m DUAL SPEED (3 PHASE) SINGLE PHASE SN(H)
How to choose an electric chain hoist?
When selecting an electric chain hoist, the operating environment, operating time, and operating frequency must be taken into consideration. Operation Method 2(3) Standard model CE Making model Pushbutton Switch single speed 50Hz 60Hz dual speed 4(5) single speed dual speed 6(7) single speed dual speed
What is the load condition of a 1-ton electric chain hoist?
When a 0.4t load is suspended on a 1-ton rated load electric chain hoist for a one-way trip, with a no-load return trip. (The lifting sling is 0.3t). In this case, the load condition is comparable to “medium” and the average operating time per day is 2 hours or less.