What are safety devices of EOT crane?
The main component of EOT cranes are Bridge, Working load limiter, Crab, Hook block, Control cabin or Pendant, Sheaves, Isolating switches, Shock absorber, Direction compass, Hoist limit switches, Upper limit switches, Brakes, Flexible steel wire rope, Load indicator, Lifting hooks and End buffers.
Which types of limit switches are used in cranes and hoists?
Rotary geared type limit switches are suitable for use reversing drives such as hoists, winches, rolling mills and various other mechanisms used such used in steel plants such as coke oven and feeding machinery.
What PPE is used when working on the overhead crane?
All crane operators, riggers and employees who work in the area where overhead cranes are in operation must wear the appropriate PPE, such as hard hats, safety glasses, work gloves and hard-toe boots.
What is the safety factor for cranes?
CMAA safety factor for the wire rope is 5:1 for standard cranes, and 8:1 for molted metal cranes.
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.
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 LMI in Crane?
Load Moment Indicator – LMI
For hydraulic cranes, the LMI reads its load value using a pair of pressure transducers, which read the cylinder pressures of the lift cylinders. An advantage of an LMI is the weight of the boom is calculated as a part of the load calculation.
How many types of limit switches are there?
– There are 4 general types of limit switches: whisker, roller, lever, and plunger.
What is limit switch in Crane?
Limit switches are electromechanical devices that regulate everything from household appliances to industrial machinery. For an overhead crane, they provide solid, established points of reference for maintaining efficiency, reliability and safety standards.
What are the hazards of lifting?
Typical hazards from lifting equipment
- failure of lifting equipment;
- falling loads; and.
- workers being crushed by a moving load or lifting equipment.
4 сент. 2020 г.
What stops the crane from falling over when it lifts something?
Why Don’t Tower Cranes Fall Over? This is mostly down to the concrete base, which is massive and needs to be poured weeks before the crane arrives. The triangulated cross-member structure of the mast gives it more stability and prevents bending. Plus, it’s anchored and bolted to the ground.
Are hard hats required for overhead crane use?
Answer: No. In normal construction operations, OSHA does not consider the boom, load line, and load block of a crane to be “objects” which could become falling objects and thus require overhead protection in addition to hard hats.
What is a 5 to 1 safety factor?
These single use/single trip bags are rated at a 5:1 safety factor ratio (SFR) which means that they have the ability to hold five times the amount of their safe work load (SWL). Remember, although the bag is rated to hold five times the rated safe working load, doing so is unsafe and is not recommended.
How is Crane SWL calculated?
SWL or WLL are calculated by dividing MBL by a safety factor (SF). An example of this would be a chain that has a MBL of 2000 lbf (8.89 kN) would have a SWL or WLL of 400 lbf (1.78 kN) if a safety factor of 5 (5:1, 5 to 1, or 1/5) is used.
What does safety factor mean?
The definition of the safety factor is simple. It is defined as the ratio between the strength of the material and the maximum stress in the part. When the stress in a specific position becomes superior to the strength of the material, the safety factor ratio becomes inferior to 1, this when there is danger.