Protection of in-running Nips

8/15/2019 Protection of in-running Nips

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Protection of in-running

nips

Presented by: Arun E T S7 ME, 13


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Introduction

In-running nips, or convergence zones, ornip points, are danger zones !ere partso" t!e body can be dra n in or crus!ed#

Eg: conveyors, printing presses, paper$ac!ines, etc#


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1. Creation of in-running nips

by cy%inders in contact &or very c%ose'turning in opposite directions

by t o cy%inders not in contact


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by a cy%inder c%ose to a stationaryob(ect

by a cy%inder in contact it! a be%t&c!ain' or t!e or)ed $ateria%


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I" t!e in-running nip cannot be e%i$inated,a *+ed enc%osing guard s!ou%d be used to

protect t!e or)ers "ro$ t!e !azards#


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2. Delimiting the drawing-in zone

In-running nips create danger zones, a%so ca%%eddra ing-in zones

!ose dept! p varies it! t!e dia$eter o" t!ecy%inders

T!e sa"ety distance sd $ust t!en be

$easured in re%ation to t!e accessib%e end o"t!is dra ing-in zone

ca%%ed t!e peri$eter o" t!e dra ing-in zone


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ang%e t!at beco$es even $ore acute !ent!e cy%inder radii are %arge#


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T!e danger zone is t!e ang%e bet eent!e t o cy%inders and is 1. $$ in!eig!t#


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In t!e case o" t o cy%inders not in contact, or acy%inder c%ose to a stationary co$ponent, t!edept! o" t!e dra ing-in zone varies in re%ation to:

› t!e dia$eter o" t!e cy%inders› gap bet een t!e cy%inders› gap bet een t!e cy%inder and t!e stationary

co$ponent#


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3. General information on the useof ed nip guards

T!e ang%e bet een t!e guard and t!e cy%inder, t!ebe%t or t!e $ateria% driven by t!e cy%inder $ust be at%east /0 and idea%%y 20

do not provide appropriate protection against t!e

ris)s o" !air or c%ot!ing being dra n in


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!he use of a nip guard Is prohi"itedif#

i" t!e $a+i$u$ c%earance o" $$cannot be $aintained bet een t!e

guard and t!e sur"ace o" t!e cy%inderand be%t

i" t!e cy%inder or t!e be%t is not s$oot!&grooves, burrs, unevenness, notc!es,corrugated rubber, abrasive "abric,etc#'


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a$ Protection of two c%linders incontact


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"$ Protection of two c%linders not incontact

I" t!e gap bet een t!e t o ro%%ers is at %east 100 $$,1.0$$ or 300 $$, t!en t!e in-running nip i%% no %onger beconsidered as !azardous "or !ands, ar$s or t!e entirebody#

anot!er sa"eguard $ust be provided to %i$it access tot!e danger zone i" t!e gap is %ess t!an 300 $$#


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c$ Protection of a c%linder close to astationar% component

d$ i f %li d i


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d$ Protection of a c%linder incontact with a stationar% &atsurface

T!e nip guard $ust be %ocated at t!esa"ety distance sd "ro$ t!e dra ing-inzone


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e$ Protection of a c%linder incontact with a "elt or a &at mo'ingcomponent

4ip guards can consist o" so%id s!apesor ang%ed de5ectors it! side pane%s


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!han( %ou)

Documents

Protection of in-running Nips