pühapäev, 31. oktoober 2010

Benefits of trolley assist

Maximizes productivity:

Higher speeds on grade with more powerful AC drives
On-grade speed (v) is limited by the available power

The truck speed increases because the trolley line can supply more power than existing diesel engines (5,200HP vs. 2,700 HP, speed increases by 90%).
Higher speed on trolley means shorter cycle time and higher productivity — or fewer trucks for the same production.

Reduces fuel and engine maintenance costs:

Without trolley, 70% to 80% of fuel is consumed on grade.
Trolley assist dramatically reduces engine power demand on grade (engine idles on direct trolley).
Engine overhaul intervals are proportional to the amount of fuel burned (e.g., 1 overhaul for every 540,000 gallons of fuel).
As a result, the engine overhaul intervals can be doubled or tripled.

Economic analysis with trolley calculator:

Eliminates the myth of complexity providing an easy to understand, fundamental feasibility analysis.
Inputs are mine-specific system parameters like cycle length, grade, production requirements, prices of diesel fuel and electricity, etc.
Quickly provides first feasibility results analyzing benefits, costs, and payback.

Environmental impact:

Reduced noise with Trolley Assist because engine idles. Trolley lines can be installed on any grade, including level ground, because vehicle speed is independent of voltage line.
Reduced noise from quiet grid blower and silent retard resistors.
Trolley operation improves air quality by reducing diesel engine emissions.

More flexibility for maximum performance:

With AC trolley assist, vehicle speed is independent of the line voltage — the driver can run at any speed.
Connection with trolley line is possible at all speeds.
Transition occurs quickly and smoothly under full diesel power with no coasting, no jerk, and with automatic connection to any trolley line voltage.

Who's using trolley assist today?

South Africa and Namibia:

Sishen Iron Ore — 41 units
Grootegeluk Coal Mine — 26 units
Palabora Mining Company — 27 units (19 in production)
Rossing Uranium — 11 units

North America:

Barrick Goldstrike Mines — 22 units

Trolley assist is typically used in deep pit mines with haul roads that don't move too frequently or where diesel fuel is much more expensive than electric fuel.

Trolleys at Sishen Iron Ore Mine, South Africa

Why aren't more mines using trolley assist?

Unfamiliarity:
Mines don't know enough about trolley assist and how it can increase productivity and profitability.
Perception of high capital cost and long payback period:
Increased productivity, especially from AC drive trucks, energy, and maintenance cost savings can lead to attractive payback periods of 1 to 3 years.
Perception of high maintenance costs for wayside and truck installed trolley equipment:
Original "railway" equipment has been modified and adapted for mining environment. Models for preventive maintenance are available from existing installations.
Less flexibility than normal truck operation:
True, trolley assist is not for everybody, but it should be considered for every new mine plan.

Boost your productivity with Trolley Assist

Efficiency on top

This is trolley assist. Normally, speed on grade is limited by diesel engine horsepower. If a truck could get more power by connecting to an overhead electric line while going uphill, it could climb faster. The engine would be idling and fuel consumption would be reduced by 95%. Noise and emissions would diminish, and productivity and engine lifetime would rise significantly.

Without a doubt, trolley operation takes some getting used to. But in mines with longer uphill hauls the economics can be particularly attractive – and trolley operation can become an invaluable supplement to the overall mine plan, achieving payback within a few years.

Higher speeds, shorter cycle times, leaner fleets

The Siemens AC drive can produce up to 5,200 HP when operated with an overhead trolley line. This can double the speed on grade and significantly reduce truck cycle times. For example, if the cycle time is reduced by 20%, 32 trucks on trolley produce the same as 40 trucks on diesel.

"Taking the line" and other technicalities

In contrast to trucks with DC drive, trucks with Siemens AC drive can connect to trolley at any speed, independent of the trolley line voltage. In addition, trucks can operate at existing line voltages of 1400V–1600V DC or on new, more efficient, high-voltage lines with 2600V. Trucks can even operate in mines with mixed systems, automatically detecting the line voltage. When the truck "takes the line," it automatically switches to either high-voltage Direct Trolley operation or low-voltage Diesel Boost Trolley operation.

Reduced operating and maintenance costs

Loaded travel on uphill grades typically accounts for 70–80% of a truck’s total fuel consumption. Depending on the relative cost of electric energy, this can translate into very attractive savings in operating costs. In addition, with engine operating and maintenance costs tied directly to fuel consumption, trolley assist further lowers your cost per ton because the time between engine overhauls may double or more.

One-Stop Trolley Shopping – from Siemens

Siemens can perform a site-specific evaluation – including haul profile data, cycle times, production requirements and energy prices – and create a cost-benefit analysis for possible trolley scenarios in your mine. Experience has shown that the higher productivity and the reductions in energy and maintenance costs lead to an attractive IRR and payback time of 1 to 3 years. In addition, we can supply all trolley equipment and services – on the truck as well as in the mine. That includes pantographs, overhead lines, substations, and line position sensors – together with financing, maintenance, and service support.

Trolley Assist: We do the math for you.

How quickly is the investment paid back? Our experience has shown that the higher productivity and the reductions in energy and maintenance costs lead to payback time of 1 to 3 years.

We consider site-specific variables to determine the economic feasibility of trolley assist. We will conduct your site-specific evaluation – including haul profile data, cycle times, production requirements and energy prices – and create a customized cost-benefit analysis for possible trolley scenarios in your mine.

http://www.sea.siemens.com/us/Industry_Solutions/Mining/mining-solutions/Pages/Trolley-Assist-Haul-Trucks.aspx

Trollikallurid

Trolley trucks on steep mining slopes

By Bruno De Wachter / Published on Mon, 2009-05-11 04:30

Improving operational, environmental, and financial performance

In discussions regarding electric vehicles, the argument is often heard that electric drives have to surrender to internal combustion drives when it comes to output power. That is a myth, as is proved by giant electrically driven mining trucks of 3,000 hp.

These trucks are used in mines throughout the world. They convert power from a diesel engine into electricity, which is then used in an electric drive system. The main reason for this energetic detour is to ease braking and speed regulation. Using an internal combustion engine for such a powerful truck would require an enormous gearbox and a complex braking system, involving a considerable amount of maintenance.

Siemens recently developed a new technology for improving the performance of this kind of electric vehicle: trolley trucks. The trolley mining trucks function like streetcars, using pantographs that connect to catenaries. This enables the doubling of the power output from the usual 3,000 hp to 6,000 hp. Such a high power is especially useful on steep mining slopes. The system makes use of grid electricity instead of a diesel engine, which significantly increases the environmental performance and reduces the energy cost.

Thanks to the improved operational performance and the lowered energy cost, the trolley installation is paid back in three years. The trolley system also allows for connecting the trucks to nearby renewable energy generation units.

teisipäev, 19. oktoober 2010

Pinnasepump

http://dredge.ee/?cid=2

Mis on pinnasepump

PINNASEPUMP - pinnasepump on mehhanismide, agregaatide ja seadmetega varustatud ujuvseadeldis veealuse pinnase töötlemiseks, selle kättesaamiseks, vajalikku kohta transportimiseks ja maha laadimiseks. Pinnasepumba abil saate oma soove täita kõige erinevamates valdkondades: puhastada veemahuteid alates pargitiigist või kombinaadi settekaevust kuni jõe ja järve süvendamiseni, ammutada karjäärist liiva ja kruusa, järvest muda.

VÄIKESEMÕÕTMELINE PINNASEPUMP - väike pinnasepump, kõige väiksema pinnasepumba konstruktsioon võimaldab töid teostada 2-3 m laiustes ja mitte sügavamates kui 0,5 m kanalites ja tiikides. Pinnasepumpade mass on alates 3-5 tonnist väikeste puhul kuni 50 tonni kõige suuremate puhul.

MOBIILNE PINNASEPUMP - pinnasepumba teisaldamine tervikuna (väiksemate võimsuste puhul) või plokkide kaupa (suurte võimsuste puhul) toimub tavalise veoautoga.

Pinnasepumbaseade kujutab endast võimsat pumpa, mis on suures osas monteeritud ujuvpontoonidele ning enamasti nimetatakse seda pinnasepumbaks. Erinevate teostatavate tööde ja kasutusvaldkondade puhul on vajalikud erinevad pinnasepumpade mudelid sõltuvalt konkreetsetest tingimustest, milles pinnasepumpa kasutatakse, pinnase koostisest, töötlemise sügavusest, transportimiskaugusest ning pinnase tõstmise kõrgusest, teede olemasolust pinnasepumba kohaletoimetamiseks ja elektrienergia olemasolust, autonoomsest kütuse ja määrdeainete süsteemist, hoolduslaevade olemasolust, ilmastikutingimustest ning paljudest teistest asjaoludest. Pinnasepumpade tootlikkus on väga erinev - alates 10 m³/h kuni 200 m³/h pinnase puhul, mille töötlemissügavus on alates 0,5 kuni 12-15 m veepinnast. Lisaseadmed on kaasaegsed - alates jõuagregaatidest kuni kontrollivate ja mõõtvate seadmeteni. Vajalik on mitte rohkem kui kahest inimesest koosnev meeskond ning pinnasepumba juhtimine toimub soojast ja mugavast ruumist juhthoobade ja nuppude abil.

esmaspäev, 18. oktoober 2010

Compactor

From Wikipedia, the free encyclopedia

Refurbished Soil Compactor

Landfill compactor

A sheepsfoot compactor/roller operated by U.S. Navy Seabees

Rammax remote controlled compactor

A compactor is a machine or mechanism used to reduce the size of waste material or soil throughcompaction. A trash compactor is often used by homes and businesses to reduce the volume of trash.

Normally powered by hydraulics, compactors take many shapes and sizes. In landfill sites for example, a large bulldozer with spiked wheels called a landfill compactor is used to drive over waste deposited bywaste collection vehicles (WCVs).

WCVs themselves incorporate a compacting mechanism which is used to increase the payload of the vehicle and reduce the number of times it has to empty. This usually takes the form of hydraulically-powered sliding plates which sweep out the collectionhopper and compress the material into what has already been loaded.

Different compactors are used in scrap metalprocessing, the most familiar being the car crusher. Such devices can either be of the "pancake" type, where a scrap automobile is flattened by a huge descending hydraulically-powered plate. The other type is the baling press, where the automobile is compressed from several directions until it resembles a large cube.

[hide]

[edit]Commercial use

Many retail and service businesses, such as fast food, restaurants, and hotels, use compactors to reduce the volume of non-recyclable waste as well as curb nuisance such as rodents and smell. In the hospitality industry tolerance for such nuisances is particularly low. These compactors typically come in electric and hydraulic operation, with quite a few loading configurations. Most popular loading configurations fall under the following:

Ground-Access;
Walk-On;
Secured Indoor Chute.

These compactors are almost exclusively of welded steel construction for two reasons: durability under pressure and exposure to the elements, as compactors are installed either completely outdoors or sometimes under a covered loading dock.

[edit]Residential use

There are also trash compactors, hydraulic or manual, designed for residential use which. Likewise, they reduce the volume of garbage. For example, some compactors reduce the volume of polystyrene to 1/30.

Styrofoam compactor.jpg

styrofoam compactor

[edit]Municipal use

In addition to the waste vehicle and landfill use, there are solar-powered trash compactors that can hold the equivalent of 200 gallons of trash before they need to be emptied. The primary manufacturer of these devices is BigBelly Solar^[1]

[edit]Construction industry

"Jumping Jack" compactor

In construction, there are three main types of compactor; the plate compactor, the "Jumping Jack" and the road roller. The roller type compactors are used for compacting crushed rock as the base layer underneath concrete or stone foundations or slabs. The plate compactor has a large vibrating baseplate and is suited for creating a level grade, while the jumping jack compactor has a smaller foot. The jumping jack type is mainly used to compact the backfill in narrow trenchesfor water or gas supply pipes etc. Road rollers may also have vibrating rollers.

In England the name "wacker plate" or just "wacker" is commonly used to refer to plate compactors, derived from the name of Wacker Construction Equipment AG, a well-known manufacturer of such devices. The name is pronounced in the English style as whacker as opposed to the correct German vacker. A "Jumping Jack" compactor is colloquially referred to as "Paddy's Motorbike", due to the traditional resource of Irish construction labourers, and the way that the operator appears to "ride" the hammer holding the handles like a motorcycle.^{[citation needed]}

[edit]Patents

U.S. Patent 2,234,098 — Can crusher and baler — 1941
U.S. Patent 7,145,450 - Compactor Service & Monitoring System - 2006

[edit]See also

[edit]References

^ Solar Compactors Make Mincemeat of Trash, All Things Considered, NPR, July 17, 2007

[edit]External links

Look up compactor inWiktionary, the free dictionary.

Preventing Injuries When Working With Ride-On Roller/Compactors, a publication from the U.S.National Institute for Occupational Safety and Health

Categories: Tools | Engineering vehicles | Waste collection

Mäetehnika

Pages