BS EN 15163-2008 pdf download.Machines and installations for the exploitation and processing of natural stone — Safety — Requirements for diamond wire saws.
5.2.2.1 Transmission parts
Moving parts, e.g. couplings and drive shafts, shall be provided with fixed guards or interlocking moveable guards to prevent contact. Guards shall comply with EN 953:1997 and in particular with Clauses 5 to 7. Fixed guards shall be used and be held in position either by welding or mounting them in such a way that they can only be opened or removed with the aid of tools or keys. The fixed guards shall not remain in place without their fixings.
Guards shall comply with the provisions of EN 294 on safety distances. Distance guards shall be in accordance with EN 294:1992, Table 1, OpenIng in guards shall be In accordance with EN 294:1992, Table 4.
When frequent access (once a day or more) is required for service or maintenance purposes, instead of fixed guards. moveable interlocking guards as defined in EN 953:1997, 3.5. shall be used. They shall comply with the relevant requirements of EN 953.
The moveable guards and doors shall be equipped with an interlocking device in compliance with
EN 1088:1995, 4.2.1, with a position detector or alternative solutions in accordance with EN 1088:1995, 6.3.
The related parts of the control system shall have a Performance Level not less than EN ISO 13849-1:2006.
Performance Level c.
If, within the limits of the intended use, in particular for outdoor use, unexpected closing of the moveable guard or door is considered to be a significant hazard, provisions shall be made for holding the guard when open.
NOTE The system may be of — for example — a locking, latching or spring-loaded type.
No guard is necessary if the transmission parts are beyond the safety distances due to their location and are
therefore out of reach (see EN 294:1992, 4.2.1).
5.2.2.2 Wire-drive wheel
Drive and idle wire wheels in motion shall be manufactured in accordance with EN ISO 12100-2:2003, 4.3 a) and b). Access to the moving parts of the wire wheels shall be prevented with fixed or interlocking moveable guards according to EN 953, so that a safety distance will be provided for the operator according to EN 294:1992, Table 4, and in case of distance guards, EN 294:1992, Table 2.
In case of interlocking moveable guards, the moveable guards and doors shall be equipped with an interlocking device with guard locking in compliance with EN 1088:1995, 4.2.2, with a position detector or alternative solutions in accordance with EN 1088:1995, 6.3.
If, within the limits of the intended use, in particular for outdoor use, unexpected closing of the moveable guard is considered to be a significant hazard, provisions shall be made for holding the guard when open.
NOTE For stationary diamond wire saws, Annex B contains an example for guarding the wire wheels and the tool not Induded In the working process.
The related parts of the control system shall have a Performance Level of not less than Performance Level c according to EN ISO 13849-1:2006.
The tension system shall be designed to prevent additional stress in the wire generated by non-continuous movement.
For stationary diamond wire saws, the design of the tensioning system shall prevent dangerous movements of the wire-wheel units in case the wire breaks (3 cm/s is considered to be a safe limit for the movement), This system shall have at least mechanical stops preventing the translational motion of the wire-wheel units beyond the limits determined by the manufacturer.
For transportable wire saws and with exception of the starting and the end of the cutting, the wire-tension system shall be regulated during the cutting operation by an automatic control system acting in accordance with the power supplied of the drive motor for the wire—drive wheel. In addition, a device shall be provided limiting the stress of the diamond wire under normal working conditions to a maximum of of the breaking load of the steel wire. This can be achieved by a current limiting device oi- similar device to limit the torque of the drive wheel according to this macimum stress on the diamond wire.
For stability reasons, no counterweight systems shall be used to tension the diamond wire.
5.2.2.4 Height-adjustment head
The height-adjustment system shall be designed in a way to prevent the fall in case of wear of the adjustment
system.
5.2.2.5 Movement of machines on rails
In case of rails with defined length, the rails shall be provided with a system to avoid the machine overrunning the end of rails. Those provisions shall consist of limit switch with positive opening of the contacts and mechanical restraint device. The related parts of the control system shall have a Performance Level of not less than EN ISO 13849-1:2006, Performance Level c.
Transportable diamond wire saws (see Figure 1) shall be equipped with a system preventing the return of the movement on the rails during the cutting operation as well as any uncontrolled movement of more than 10 mm In case of interruption or restoration of energy supply.
5.2.2.6 Block trolley
Powered block trolleys on rails with an integrated control system shall have a provision (e.g. limit stops) to prevent the trolleys overrunning the end of rails. They shall have a system avoiding any non-intended movement during the culling operation.BS EN 15163-2008 pdf download.