BS EN 422:2009 pdf free download – Plastics and rubber machines Blow moulding machines Safety requirements.
4.2 Mechanical hazards related to power operated movements during production
NOTE In subclauses 4.2 to 4.4, the sequence of hazards corresponds with the sequence of the safety requirements and/or protective measures specified in subclauses 5.2 to 5.4.
Injuries due to dangerous movements or parts as listed in Table 1 (see 5.2.1).
4.3 Additional hazards associated with machines of specific design
4.3.1 Machines allowing whole body access
Crushing, shearing, impact and entanglement by moving parts when operators have whole body access:
— in the area of movement of the moulds;
between the guard or safety device and dangerous moving parts;
through the discharge aperture.
4.3.2 Rotary machines
Crushing, shearing, drawing-in or impact due to movements of the rotating table.
Crushing, shearing, drawing-in or impact due to movements of the rotating table because of imbalance during mould changing (only in the case of a horizontal axis of rotation).
4.4 Additional hazards when using ancillary equipment
Hazards are dependent on the type of ancillary equipment.
5 Safety requirements and/or protective measures
5.1 General
5.1.1 Basic requirements
Blow moulding machines shall comply with the safety requirements and/or protective measures of this clause. In addition, the machine shall be designed in accordance with the principles of EN ISO 12100 for relevant but not significant hazards which are not dealt with in this document.
The safety related parts of the control system shall be designed in accordance with EN ISO 13849-1:2006. The required performance level (PLr) for each safety function is specified below. See also 7.1.2.
Adjustment elements which must be adjusted during production shall be accessible from outside the danger zone. When these adjustment elements are higher than 2 m above floor level, permanent means of access according to EN ISO 14122 series shall be provided. Where a special tool is necessary for adjustment such a tool shall be supplied by the machine manufacturer.
5.1.2 Safety distances
For fixed guards or machine parts preventing access to the moving moulds (closing and transfer movements), EN ISO 13857:2008 Tables 2 and 4 shall be used. Tables I and 4 shall be used in all other cases.
Electro-sensitive protective equipment (ESPE) shall be positioned in accordance with EN 999:1998.
5.1.3 Emergency stop
The emergency stop shall stop all movement but not necessarily the heating. The stop category shall be 0 or 1 according to EN 60204-1:2006 whichever provides the shorter rundown time. See 7.1 .3.
5.1.4 Fluid systems
Hydraulic and pneumatic systems shall be designed in accordance with respectively EN 982:1996 and EN 983:1996.
The flexible hoses for hydraulic fluids under a pressure of more than 50 bar and for pneumatic fluids of more than 10 bar shall be secured to the machine by additional fastenings (for example chains) limiting the whiplash. On machines equipped with guards, this requirement does not apply to flexible hoses situated inside the guards.
However, additional fastenings for flexible hoses for blowing fluids are also required inside the machine, except if the machine is safeguarded by interlocking guards with guard locking and the pressure in the pneumatic hoses is reduced to under 10 bar before the guard lock can be released. The PL,. for this safety function shall be c.
To avoid injury by ejected fluids accessible hoses and connections shall be covered by guards.