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Accessafe adeguamento sicurezze di una testa verniciante

Perimetra functional safety for protection guard upgrade of a coating head

Introduction

Accessafe was commissioned to develop a safety upgrade project on a coating head machine, which the commissioning company had made available to the workers at their factory before thr introduction of the DPR 459/96 regulation and therefore without CE marking.

On the basis of the on-site evaluation and the information provided by the operators who worked on the plant, it was determined that the Machines needed to conform with the minimum requirements of annexe 5 of the Italian Legislative Decree 81/08. The upgrade makes the machine meet the requirements of the directive: ATEX 2014/34, the Machinery Directive 42/2006 and conformite to the harmonised standards listed below:

  • EN 12100: 2010 Machinery Safety
  • EN ISO 13857: 2008 Safety distance for upper and lower limbs
  • EN 349: 2008 Minimum gaps to avoid crushing hazards
  • EN ISO13850: 2015 Emergency stops
  • EN 14119: 2013Interlocking devices connected to the guards
  • EN 14120: 2015 Fixed and movable guards
  • EN 1037: 2008 Prevention of unexpected start-up
  • EN 547: 2009-1 Human body measurements: whole body access openings
  • EN 547: 2009-2 Human body measurements– limb access openings
  • EN 547: 2009-3 Human body measurements – anthropometric data
  • EN ISO 14738: 2009 – Anthropometric requirements for work stations
  • EN 60204-1:2006 – Machine Electrical equipment
  • EN 61439-1:2012 Low voltage electric cabinets- General rules
  • EN 13849-1: 2016 Safety-related parts of control systems

Project development

The project design included the use of panels with vertical aluminium profiled frames and galvanised mesh suitable for the machine hazard zones as per EN ISO 1357:2008 as an infill.

The profiles used for the project have the following dimensions:: 32X32 – 32X45 – 18.5 X32 – 18.5X45 – 45X45 – 32X45, and have been built in conformance with the pertinent standard requirements of EN 14120:2015.

Accessafe Safety Adaptation of a Coating Head

We have selected Euchner ATEX certified position sensors, here below the list of specific models: CES ( 1-2-3-4-7-8-9-10-11-12 ) and pedestrian access points behind the CET (5- 6) as in the illustration below:

Euchner brand position sensors

The previous mentioned components were positioned as follows:

Euchner brand position sensors
Positioning Euchner brand position sensors
Euchner brand position sensors

Working conditions

The machine is equipped with two work groups called A and B, what follows is the safety elements function mode for both coating heads analysed.

When group A-B are running, the safety logic will follow the conditions below:

Working conditions
Working conditions

Please note that in absence of the above listed conditions, the machine cannot run.

MAINTENANCE PROCEDURES ONCE UPGRADE HAS BEEN COMPLETED

For cases in which entrance through rear door is needed, Accessafe has fitted the door with a key-switch panel which activates access request. Once it has been activated by pressing the request button, a stop request will be sent to the group in question, which, once it has come to a stop, will activate the access unlocking relay allowing the operator to safely enter the work area. When a maintenance intervention is needed, a command for the interested coating head extraction will be activated and the machine cycle will be interrupted by disarming the sensor (sensor 2 for group A – sensor 3 for group B), and blocking any possible movement.

Once the extraction has been completed a safety sensor will be activated in “REST” position (called N1 for group A and N4 fro group B).

Once this procedure has been completed the extracted head cannot be activated and it will be possible to remove and open the protection housing to reach parts object of the maintenance operations. The second head is still in place and can work in the conditions of armoured sensors, as previously described, thanks to the protection housings put in place which will prevent the maintenance operator from reaching moving parts.

At the end of the maintenance intervention, all the fixed guards shall be put back into place and the movable guards shall be closed, such operation is assured by positioning and activating the safety sensors. If such operations have not been carried out, it will be impossible to reset or move in any way the serviced coating head. If all conditions above have been met, it is possible to reset safety sensors using the blue light push button which will emit a signal to warn the machine is restarting.

When the button is pressed a ray of continuous light will light the area and it will be possible to give the move into group position command by activating the safety sensor and starting the machine work cycle.

Accessafe has fitted two mushroom emergency buttons in the vicinty of operator’s stationing area at the head of the two coating groups.

Further analysis by Marco Vaccarone

CMSE® Certified Machinery Safety Expert

In this case we were faced with the securing of a Pick and Place manipulator with a vacuum picking organ performing at low speed, due to the fragility of the product, so lower than 250 mm/sec.  and 5 pieces/ hour. 

This allowed us to manage product haul-off opening as a residual risk by affixing dedicated warning signs  (Directive 92/58/CEE) which inform about the possible hazard should the operator mounts on the conveyor belt. By doing so we have achieved a safety solution which does not require the use of photoelectric barriers.

Voir plus de projets de Perimentra

Demande d'informations supplémentaires

Vous voulez des conseils sur l’état de sécurité de vos machines ? Envoyez une demande de devis à fast@accessafe.eu.

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