BS EN 1612:2019 pdf free.Plastics and rubber machines – Reaction moulding machines and plants – Safety requirements.
The access to all the moving parts during production shall be prevented by distance guards in accordance with EN ISO 13857:2008, Table 2 and Table 4 and EN ISO 14120:2015, in combination with one or more of the following safeguards, in order to stop all dangerous movements if actuated: — interlocking guards with or without guard locking in accordance with EN ISO 14119:2013; for interlocked guards where full body access is possible, it shall be possible to open them from the inside without the use of ancillary means; — trip devices: — electro-sensitive protective equipment in accordance with EN 61496-1:2013, type 2; — pressure-sensitive protective mats in accordance with EN ISO 13856-1:2013; — laser scanner in accordance with EN 61496-1:2013. Interlocking guards without guard locking and trip devices shall be positioned in accordance with EN ISO 13855:2010. If full body access is possible a reset device according to EN ISO 13849-1:2015, 5.2.2 shall be installed to prevent the unexpected restart when somebody is inside the protected area.The PLr of the safety related parts of the control system in accordance with EN ISO 13849-1:2015 for the stopping of dangerous moving parts of the machine shall be as follows: — handling unit (e.g. for parts or mixing head or moulds) ≤3 axes: PLr = c; — handling unit (e.g. for parts or mixing head or moulds) > 3 axes: PLr = d;
Because of the need to replace hoses a shot counter for dynamic load changes shall be provided for metering unit and mixing head that work at a pressure of more than 40 bar. See 6.3 d), 1). Adjustment devices on the mixing head, for example screws or pins shall be designed in such a way that they are retained in the head so that unintentional complete removal of these devices and the resulting outflow of fluids is prevented.In case of any failure of the energy supply, it shall be prevented that fluids are released from the mixing head by means of a valve which shall automatically close. See also 4A for restart function.For a manually operated mixing head, a hold to run control device shall enable the release of the fluids or a stop button shall be provided at the mixing head. The safety related parts of the control system shall be PLr = b of EN ISO 13849-1:2015.Where the release of the fluid from the mixing head is not electrically controlled, an additional manual valve at the mixing head shall be installed to stop the flow of the components in case of emergency.BS EN 1612 pdf download.