I would have expected a more precise question from Fichtner. Please elaborate on the thread intent. ■

Hi Kartik...

Principal considerations relative to elevators include justification, location, size, type & operating characteristics..

Elevators rests on a number of interrelated factors...

1) Foot traffic between the intake deck & crusher house levels.

2) Vertical distances

3) Portable equipment movement

& many more .............

Three or less operating levels with total vertical distance of 12m (40 ft) or less will seldom justify an elevator. .....

Rajesh ...... ■

You still haven't got a meaningful answer to a rather meaningless question.

Give us a clue to what you're looking for. ■

I'm still totally confused! ■

I daren't venture further comment lest my understanding of English should be yet again called into question. ■

Originally Posted by louispanjang

I daren't venture further comment lest my understanding of English should be yet again called into question.

I hadn't noted you suffering problems expressing yourself in English

Reading it all again, you don't think he's talking about a lift do you?

Would make getting to a high level a lot easier than a load of stairs (with my advancing years I don't like a lot of stairs ).

PS, I like all the new features we've got on the forum ■

From the last 2 replies I now feel confident to formulate some sort of reply.

Consider that if you fit a very heavy duty lift/elevator (as our N American colleagues say) then there will be an issue of monorail interference with the lift cage roof and the hoisting cables. To reduce that problem you will have to go for an Alimak type of lift where the cage climbs along a vertical rack. You will have to then provide a, preferably rail mounted, trolley to collect and transfer the equipment from the working floors to the cage. If you don't use an Alimak & trolley then you have to sling the gear under the cage bridle which is messy and can be dangerous. Miners used to sling machinery under the cage above 5000m shafts in Saath Efrika..but they really knew the score..."better men than I am..."

You will still need the stairs for emegency egress.

I would need the stairs anyway to follow up my excercise regime after a quadruple heart bypass. ■

1) for lifting large heavy items you have a lifting well big enough for the largest item from ground level to the top floor with heavy duty lifting beams according the loads to be lifted and side access at all intermediate floor levels.

2) for old materials handling engineers you have a personnel lift (or elevator for the US citizens) with access to all floors.

3) for health and safety you also have stairs. Additionally this allows for the times when some plonker leaves the lift door ajar and it won't come when you press the call button! ■

Many existing crusher houses are satisfactory without elevators/lift, & rather definite justification should be apparent to warrant crusher house design.

Elevators/Lift should be basically the passenger type, Fright or combination freight-passenger types may required where crusher house area are planed for warehousing or when needed for maintenance shop.

Generally....

Lift beam shall be extended to outside of the crusher house through suitable opening fixed with steel door with extended platform & removable hand railings to to enable removal of equipment to ground level.......... ■

Originally Posted by KARTHIK.T

In crusher house whether elevator is required? If required what is the purpose.

First:

A freight elevator rated for the heaviest possible component, a bridge crane or jib crane is a necessity.

Second don't make the mistake of not ordering a bridge crane with too short a cable lift; it needs to go all the way to the ground and more length with one wrap on a spooling drum and having extra cable drum wraps are a necessity with a multi cable block and tackle sheave block.

You need it for both large parts such as conveyor drive units, motors, gear boxes, replacement conveyor belt rolls, replacement steel plating for ore chutes, crusher bearings flywheels, electric motors, reduction gear boxes wear plates and liners for a jaw crusher, crusher rolls for a roll crusher, cones, dies, springs, wear plates/shoes for a short head cone crusher, and smaller parts, and to move tools, welders, and to save time and labor. An Alimak raise climber is an excellent choice for a building exterior installation and it (Alimak) has an excellent track record world wide.

OK, this time I am assuming the crusher house has not been built yet by the nature of T. Karthiks statement.

First a crusher does not need to be elevated to work.

Second a crusher can go almost anywhere if you brreak it down/dissassemble it enough-ask me I have done it.

Yes louis cable slings are an ugly thing to hang machinery parts on but they work.

The reason most crushers and screeners are elevated is to take advantage of a limited work area and gravity as the overhead area is open to the outside so to speak allowing one to concentrate all the necesary functions primary breaker/ primary screener/secondary crusher/final screener size with over size going to recrush or waste depending on the ore type.

That is why coal breaker building were built into hillsides to allow the use of gravity to load coal cars after the coal was broken and sized and dumped into bunkers below the breaker building and above the railroad siding tracks.

If the system is designed properly-in this mine mechanics opinion;

The power plant has a well area with a rail line to recieve components-boiler structures, harp pipes, turbines, generators, superheaters, heat exchangers, piping bundles, ready mix concrete or bagged concrete for floors and coal bunkers, water circulating and recirculating pumps, basement piping, ash/water pumps for coal ashes.

Ideally the plant shell will have been built entirely with the bridge crane accessing the entire plant from above with clear head room in the case of a stoker fired plant but a pulverised coal plant will normally have its boilers anchored to the roof and going all the way to the basement where the pump room is located-but there is nothing to say a boiler could not be secured to a steel frame above the boiler but below the bridge crane.

A pulverised coal plant is built from the bottom up installing all the basement machinery, stairs, intake water pumps, re-circulating pumps for heat recapture and cooling water discharge pumps, heat exchangers/recyclers, piping, de-aerators, wire trays, wiring, coal grinders, coal scales, coal blower fans to blow coal into all four corners of the boiler etc. the turbine floor is last as the turbine or turbines sit on a steel formwork foundation that goes all the way to the basement due to the related plumbing and piping for high pressure steam, low pressure steam return condensate and vents to the roof for the turbines.

A coal stoker plant is built the same way.

OK now to a primary breaker/crusher house:

A primary crusher will have a receiving hopper with a slow speed apron feeder to uniformly feed the crusher rather than have a surge of broken ore all at once.

Below the crusher a conveyor takes away the broken coal to be screened again or recirculated to a second screen for re-crushing.

The coal passing through the screens is delivered to a another take away conveyor to be burned.

A large gyratory bowl crusher may be used for primary breaking of ore, the crusher may also have a hydraulic grab for oversize rocks or a hydraulic hammer to break them. A crusher of this type is ment for rock ores usually.

The crusher may or may not have a bottom discharge as in the case of a WR Stamler belt feeder breaker, Mclanahan belt feeder breaker or Long Airdox Roscoe belt feeder breaker where it is discharged horizontally to a conveyor.

A roll crusher sizer such as those built by Pennsylvania Crusher are used to break and size coal prior to use.

A coal crusher sizer has a top feed and bottom discharge with one or two rolls with carbide breaker bits or hammer mills.

A coal stock piling system will quite often have a crusher sizer at its center draw point underground to feed, break, and convey coal all at once.

lzaharis ■