LJH Group Limited / News Articles / Taurus Waste Recycling

LJH Waste Sorting Plant for Taurus

The LJH Group of companies have recently supplied a complete waste sorting plant to Taurus Waste Recycling of Aldershot. The company were commissioned to design, manufacture, supply and install the plant to comply with European Directive 98/37/CE, with all conveyors fully guarded to BS 7300. This heavy-duty design is based on many years experience of producing high quality mechanical handling plants for the quarrying and material handling industries.

The Taurus waste sorting system was designed to specific criteria and is required to handle a wide range of material; mainly commercial and domestic skip waste at the rate of 50 tonnes per hour depending on material bulk, density and condition.

Feed material was limited to 450mm maximum size and 25kgs maximum weight; any combustible or corrosive material was removed. The system allows manual selection and rejection of particular materials not required in the end product, into 40 cubic yard skips. The design also allows cleaned material to be fed into the crusher and produce a clean crushed material, alternatively, it allows cleaned material to feed directly into a separate bay or skip by means of a bifurcated chute. A 10m conveyor provides for a stockpile of approximately 100 tonnes of crushed material to be produced.

The system is currently fed by an existing mobile screening plant, fitted with a 5-inch punch plate screen which regulates the feed size, and then a 10’ x 5’ double deck screen removes the fines. The oversize material is discharged into the waste system feed hopper, which is constructed with 10mm thick plate suitably stiffened and braced. The hopper has a feed height of 2.65 metres and a feed width of 3.94 metres; this is sized accordingly so that it can also be side-fed by the loading shovel direct. At the feed section the belt is supported on rubber impact bars complete with a low friction running surface, close-pitched parallel idlers are fitted there after. The inclined conveyor section is fitted with high-sided steel skirts which are provided along its entire length to prevent material slippage, additionally soft rubber sealing strips which are easily adjustable for wear are fitted to minimise spillage of fine material. This section of the conveyor carries material up to the horizontal picking section and is of a heavy-duty stringer construction.

The picking section of the conveyor is constructed with heavy duty fully welded gantry construction to minimise the amount of support legs required in the skip area situated below which has a nominal clearance height of 3.95 metres. This section is housed within a 6.5 metres x 3.6 metres wide operator’s cabin, which is fitted with lighting and heating to provide for greater operator comfort.

The picking belt stations comprise of 1200mm x 400mm discharge chute with an adjacently mounted emergency stop on each. There are two picking belt stations on either side. The picking section of the conveyor belt is supported on low friction, ultra high molecular weight polyurethane running strips.

The conveyor belt is 1200mm wide x 21.80 metre centres driven by a hydraulically geared motor rated at 4 kw coupled to the head shaft and the head drum is lagged with rubber diamond pattern material to prevent belt slippage.

The cleaned material is then fed into a Parker 800 x 500Rocksizer single toggle jaw crusher supported on a heavy-duty fully welded skid mounted frame and includes feed and discharge chutes to suit. This machine is equipped with straight-toothed manganese steel jaws (inverted for maximum wear life) and replaceable manganese steel liners and is driven by a Caterpillar 3116 DITA 160HP emission regulated powerpack, which provides 160HP at 1970 rpm unloaded and 1800 rpm loaded. Access is provided by a 600mm wide catwalk around the sides of the crusher and powerpack with galvanised hand railing and standards. Acoustic treatment was made to the engine steel sheet canopy and outlet louvers to the radiator.

The crushed material is then discharged onto a stockpiling conveyor fitted with steel skirts which are provided along its entire length to prevent material slippage, additionally soft rubber sealing strips which are easily adjustable for wear are fitted to minimise spillage of fine material. The conveyor is driven using a 5.5 kw hydraulic motor coupled to the head drum shaft, and the head drum is lagged with rubber diamond pattern material to prevent belt slippage.

The plant design encompassed particular attention to material transfer points to minimise blockages and material spillage and maximised the utilisation of available space at the site.

It also provided Taurus with the ease of routine maintenance and a high service factor on all transmission units to ensure long life if properly maintained. LJH also standardised on consumables and wearing parts providing a minimal spare parts stock holding.