BS EN 1009-4:2020 pdf download
BS EN 1009-4:2020 pdf download.Machines for mechanical processing of minerals and similar solid materials – Safety Part 4: Specific requirements for screening machinery.
4.2 Ergonomics requirements for screening machines maintenance
4.2.1 General
According to EN 1009.1:2020, the EN ISO 14122 serIes, EN 547’1:1996+Al:2008 and EN 547-21996+A1:20O8 apply.
The design of screening machines shall be such that the frequency and duration of maintenance operations in the screen, in which an operator is required to enter, are minimized.
The design of screening machines should be such that inspection, cleaning and maintenance operations can be performed from a position outside of the screen box. This can be achieved for example by providing means to adjust the screen tension from outside the screen box, providing access hatches in the body of the screen In order to allow upper limb access to the tensioning bolts, reducing the size of the screening media in order to facilitate the ease of removal of screening medias.
In complement to EN 1009-1:2020, 4.2.1, the minimum dimensions given in 42.2 and 4.2.3 shall he considered taking Into account any maintenance hatches and moveable parts that are Incorporated Into screening machines. For example:
— moveable conveyors (for example, raising, lowering, sliding conveyors);
— moveable feeding hoppers;
— moveable chute;
— splitting of screens.
Where inspection, cleaning or maintenance is performed when moveable parts are in the raised position, these moveable parts shall be mechanically secured with a device, for example locking pin. These devices shall be permanently affixed to the machine or stored on a safe place on the machine.
Inspection, cleaning and maintenance procedures shall be described in the instruction handbook (folding. dismantling meshes and lining, mechanical parts, etc.), see Clause 6.
In all cases described in 4.2.2 and 4.2.3, the reach distances may be increased depending on the length of a tool, if such tool is intended to be used according to the instruction handbook of the manufacturer.
The mesh material can be metallic, rubber (RU) or polyurethane (PU) with tensioning or modular system. Whatever Is the mesh material the Inspection, cleaning and maintenance procedures shall be described in the instruction handbook (folding, dismantling meshes and lining. mechanical parts, etc.), see Clause 6.
4.2.2 Minimum dimensions for Inspection
4.2,2.1 Inspection laterally from outside through an opening for one upper limb
As one arm is sufficient for access through an access opening with a minimum diameter. C. of 141 mm for Inspection from outside, maximum dimension for one upper limb to reach the Inspection area (R) shall be 495 mm (see Figure 1). It may be increased if the access openings, C, are larger than the minimum dimensions.
4.2.4.4 Working space to work inside
4.2.4.4.1 General
For maintenance on the upper deck of a screen, safety devices e.g. guardrails. anti-fall device) shall be installed during the operations and shall be described in the maintenance manual.
For maintenance from the rear or the front between two decks, the minimum width (A) shall be 645 mm (see Figure 8).
The distance between two decks under cross beam shall be 550 mm except for replacement or upgrade on an existing plant due to space constraints, this minimum distance (H2) may be 450 mm.
When it is not necessary to access beneath the obstacle(s) (see 4.2.4.4.2 and 4.2.4.4.3), the height below obstacle(s) under which the operator can work shall be at least 300 mm.
When It Is not necessary to access beneath the obstacl4s) nor needed to use tool, then the height below the obstacle does not apply (e.g. self-supporting media) and the working procedure shall be provided in the Instructions for use
4.2.4.4.2 Case of a single punctual obstacle (e.g. transmission mechanism)
The length of a punctual obstacle shall be no more than 393 mm, under the condition that access is possible from each side of the obstacle (see Figure 9 and Figure 10).
