• What was needed: Hauling earth from pits up to 65 metres deep. This is made possible by a pulley module from the French company Ets Payant, which is attached under the boom of an excavator
• Requirements: 100% freedom from lubrication and maintenance, resistance, insensitivity to weathering effects, withstanding strong impacts and high weight
• Products used: plain bearings with and without flange, washers, double joints, linear guides, aluminium shafts, liners, pillow blocks, sliding plates, trapezoidal lead screw, trapezoidal lead screw nut
• Success for the customer: The igus® solutions can be found in the most diverse areas: in the centre pins for the folding arms of the roller reefing systems, the centre pins on the housings for fastening the hoses to the shaft end support, the guidances of the dampers for tensioning the hoses in the housings and the guidances and drives for the carriages of the winding machine. Thereby all igus® parts fulfil the desired requirements: easy installation, maintenance-free, insensitive to moisture and dust.

Video in French

Problem

The pulley module is an equipment that can be attached to a standard 40-ton hydraulic excavator. It is designed to extract mining waste from the excavation of pits up to 65m deep. It consists of a module with winches and hose reels. This module weighs almost seven tons and is attached under the boom of the machine with a quick-change system. Furthermore, a guide roller module is installed, which is attached to the end of the dipper arm of the excavator with a quick-change system. The cables and hydraulic hoses are attached to a hydraulic clamshell bucket with spreader, which have a system for dampening the tensile forces. Four machines are currently being used on the GRAND PARIS EXPRESS construction site; the construction of a metro line on the outskirts of Paris that has to pass under existing networks and tunnels, which explains the great depths that have to be reached without any problems. Thus, a small space is necessary of the machine. 

Solution

The vertical line of the centre of gravity of the winch and hose reel module runs within the area where the tracks rest on the ground, which contributes to the stability of the entire unit. Accordingly, all installed parts must withstand the heavy weight, which poses no problem for the igus® parts. With the TGP equipment (Terrain Grande Profondeur), the machine is very powerful, compact and relatively easy to transport. In terms of easy folding and a long service life, the igus® solutions were able to prove themselves against the metallic alternatives. No maintenance or regular lubrication is required. The small requirement of space of this machine, both during transport and at work, are an advantage for these construction sites in urban environments.  In the transport position with the hose reels folded in, the machine is identical to the basic excavator in all three dimensions. 

dryspin® trapezoidal lead screw

dryspin® trapezoidal lead screw nut

iglidur® G, flanged bearing

iglidur® G, sleeve bearing

iglidur® G, thrust washer

igubal® double joints

drylin® R, aluminium shaft

drylin® R, liner

drylin® R, pillow block

drylin® R, sliding plates

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