Why is shaft mining dangerous?

Falling in a shaft for even a short distance can cause serious injury or even death. The entire area near an opening is often unstable and may cave into the shaft at any time, carrying an unwary trespasser with it. The dangers associated with mine tunnels, or adits, are not always as obvious as with shafts.

What do you call the two parts of a lift that goes down a mine?

Answer: The sheave wheel is a pulley wheel that sits above the mine shaft. The hoist cable passes over the sheave wheel and then down the shaft of the mine. The sheave wheel reduces the sliding friction of the mine cable.

What does the headgear of a mine do?

Mine headgear constructions support wheel mechanisms for suspending winding cables that transport workers and ore up and down deep level shafts. These strange anthropomorphic structures have become the iconic symbol for mining.

How does a mining headframe work?

A headframe is a simple structure, essentially serving as the top of an elevator shaft, allowing miners to be transported deep into the mine, and back to the surface again, and also allowing ore and waste rock to be transported to the surface.

What is the difference between two mine winches?

So what are the differences between the two? The biggest difference is that a hoist is designed to both lift and lower a load, whereas a winch is designed to pull a load – and depending on design, hold it in place.

What happens in a winding house of a mine?

Part 1: The winch or hoist is in a winding house. This part of the system is used to wind or unwind the steel cable. The mine cage and the skips are lowered into the mine when a steel cable unwinds from the winch. The mine cage and skips are raised when the steel cable winds up again.

What does a counterweight do for a mine winding system?

A counterweight is a weight that, by applying an opposite force, provides balance and stability of a mechanical system. The purpose of a counterweight is to make lifting the load faster and more efficient, which saves energy and is less taxing on the lifting machine.

Do you think I beams are good thing to use for head frame support Why?

The shape of I beams makes them excellent for unidirectional bending parallel to the web. The horizontal flanges resist the bending movement, while the web resists the shear stress. They are also cost effective, since the “I” shape is an economic design that doesn’t use excess steel.

What Is a Winding House?

Winding house definitions Building where a winding-engine was housed to operate a winding mechanism and the winding drum around which the cable or rope was wound.

What a sheave wheel is and what its function is?

A sheave (/ʃiːv/) or pulley wheel is a grooved wheel often used for holding a belt, wire rope, or rope and incorporated into a pulley. The sheave spins on an axle or bearing inside the frame of the pulley. Sheaves can be used to redirect a cable or rope, lift loads, and transmit power.

What is a winding engine driver?

Job Description: To operate/hoist to obtain production levels as required by the production / mining plan and supervise the stockpile crew. Tasks and Responsibilities: • Facilitate the safe hoisting of persons, materials and ore, up and down the shaft. • Record conditions of winding engine daily.

What is an Onsetter?

i. The person in charge of loading and unloading of cages or skips at the pit bottom, and also the signaling to the pithead.

Which direction is an I beam stronger?

vertical

What is the strongest beam shape?

The most efficient shape for both directions in 2D is a box (a square shell) however the most efficient shape for bending in any direction is a cylindrical shell or tube. But, for unidirectional bending, the I or wide flange beam is superior.

What a sheave wheel is and what it does?

What does Sheaving mean?

Sheave definitions To collect and bind into a sheaf. Sheave is defined as to gather and bind into a collection, often done with grain plants. An example of sheave is to group together wheat.

What’s the difference between a shiv and a pulley?

A pulley is one of six types of simple machines. A sheave (pronounced “shiv”) is actually part of the pulley system. The sheave is the rotating, grooved wheel inside the pulley. This is the piece that the rope fits into.

What does Sheeve mean?

(ʃiːv ) a wheel with a grooved rim, esp one used as a pulley.

What does sheaves mean in the Bible?

Sheaves of grain are revered in the Bible and in ancient cultures. The bundles were appreciated for the hard work that went into growing, harvesting and drying out these beneficial crops. It was the focus of a popular gospel song in the late 1800s.

What does Sieve mean?

A sieve is a tool used for separating solids from liquids or larger pieces of something from smaller pieces. It consists of a metal or plastic ring with a wire or plastic net underneath, which the liquid or smaller pieces pass through.