EN 12321:2003

SLOVENSKI STANDARD
SIST EN 12321:2004
01-junij-2004
Stroji za podzemno pridobivanje – Spisek varnostnih zahtev za odkopni
transporter
Underground mining machinery - Specification for the safety requirements of armoured
face conveyors
Bergbaumaschinen unter Tage - Sicherheitsanforderungen an Kettenkratzerförderer
Machines d'exploitation souterraine - Spécification relative aux prescriptions de sécurité
des transporteurs blindés a chaîne a raclettes
Ta slovenski standard je istoveten z: EN 12321:2003
ICS:
73.100.30 Oprema za vrtanje in Equipment for drilling and
izkopavanje mine excavation
SIST EN 12321:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
EN 12321
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2003
ICS 73.100.30
English version
Underground mining machinery - Specification for the safety
requirements of armoured face conveyors
Machines d'exploitation souterraine - Spécification relative Bergbaumaschinen unter Tage - Sicherheitsanforderungen
aux prescriptions de sécurité des transporteurs blindés à an Kettenkratzerförderer
chaîne à raclettes
This European Standard was approved by CEN on 11 March 2003.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12321:2003 E
worldwide for CEN national Members.

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EN 12321:2003 (E)
Contents
Foreword.3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions.6
4 List of significant hazards.7
5 Safety requirements/protective measures .8
5.1 General.8
5.2 Starting.9
5.3 Stopping.9
5.4 Thermal hazards.10
5.5 Fluid power systems .10
5.6 Hydraulic pipes and hoses .11
5.7 Other dangerous areas.11
5.8 Warning signs .11
5.9 Transport, installation, operation and maintenance .11
5.10 Guarding .12
5.11 Chain locking devices and tensioning devices .12
6 Verification of safety requirements.12
7. Information for use .13
7.1 Instruction handbook .13
7.2 Marking .15
Annex A (Normative) Verification data for safety requirements .16
Annex ZA (informative) Relationship of this European Standard with EU Directives.18
Bibliography .19
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EN 12321:2003 (E)
Foreword
This document (EN 12321:2003) has been prepared by Technical Committee CEN /TC 196 "Machines for
underground mining - Safety", the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an identical text or
by endorsement, at the latest by October 2003, and conflicting national standards shall be withdrawn at the latest
by October 2003.
This document has been prepared under a mandate given to CEN by the European Commission and the European
Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this document.
Annex A is informative.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,
Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
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EN 12321:2003 (E)
Introduction
This European Standard is a type C standard as stated in EN 1070.
The extent to which hazards are covered is indicated in the scope of this standard. When compiling this standard it
has been assumed that:
components are:
- designed in accordance with good engineering practice, taking account of expected shocks and vibrations and
calculation codes, including all failure modes;
- of sound mechanical and electrical construction;
- made of materials with adequate strength and of suitable quality; and
- free of defects.
- harmful materials, such as asbestos are not used;
- components are kept in good repair and working order, so that the required dimensions remain fulfilled despite
wear;
- negotiations have taken place between the manufacturer or authorised representative, purchaser and/or user
(e.g. for fire resistant fluids, safety equipment and load restraining devices).
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EN 12321:2003 (E)
1 Scope
1.1 This European Standard specifies the safety requirements for armoured face conveyors and covers,
conveyor drive units, return units, line pans, chain assemblies, devices for tensioning and locking chains.
This European Standard does not apply to stage loader ancillaries, armoured face conveyors which form part of
mineral bunker systems or operate as spillage conveyors, to haulage systems and guides utilised by extraction
machines, to the technical requirements for cable-less remote controls, to compressed air powered machines, or to
the interfaces between the elements of the conveyor and other machine installations.
Armoured face conveyors are designed for the transport of minerals and rock only.
NOTE Armoured face conveyors can be used as a base for guiding the extraction machine and as a link between the face
roof support and the extraction machine if required.
This European Standard deals with all hazards, hazardous situations and events for the use in mines, when they
are used as intended and for the conditions foreseen by the manufacturer. See clause 4 for the hazards dealt with.
1.2 This European Standard does not cover any hazards resulting from the electrical equipment associated with
the machine. It does not contain any requirements relating to dust suppression or firedamp hazards. Hazards due
to noise are also excluded from this European Standard, but a separate European Standard is in preparation where
hazards due to noise will be addressed.
It is intended for manufacturers producing and marketing complete machines, and for manufacturers assembling
new parts from different origins or assembling new machines even for their own use. These are called
“manufacturers” in this European Standard.
1.3 This European Standard applies to armoured face conveyors which are manufactured after the date of issue
of this European Standard.
2 Normative references
This European Standard incorporates by dated or undated references, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies (including amendments).
EN 292-1:1991, Safety of machinery — Basic concepts, general principles for design —
Part 1: Basic terminology, methodology.
EN 292-2:1991, Safety of machinery — Basic concepts, general principles for design —
Part 2: Technical principles and specifications.
EN 457, Safety of machinery — Auditory danger signals — General requirements, design and testing (ISO 7731:1986,
modified).
EN 547-3, Safety of machinery — Human body measurements — Part 3: Anthropometric data.
EN 563, Safety of machinery - Temperatures of touchable surfaces – Ergonomics data to establish temperature
limit values for hot surfaces.
EN 894-1, Safety of machinery — Ergonomics requirements for the design of displays and control actuators — Part 1:
General principles for human interactions with displays and control actuators.
EN 894-2, Safety of machinery — Ergonomics requirements for the design of displays and control actuators — Part 2:
Displays.
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EN 12321:2003 (E)
EN 894-3, Safety of machinery — Ergonomics requirements for the design of displays and control actuators — Part 3:
Control actuators.
EN 953, Safety of machinery — Guards — General requirements for the design and construction of fixed and
movable guards.
EN 982, Safety of machinery — Safety requirements for fluid power systems and their components — Hydraulics.
EN 1050:1996, Safety of machinery – Principles for risk assessment.
EN 1070:1998, Safety of machinery — Terminology.
EN 13202:2000, Ergonomics of the thermal environment — Temperatures of touchable hot surfaces - Guidance for
establishing surface temperature limit values in production standards with the aid of EN 563.
EN 61310-2, Safety of machinery — Indication, marking and actuation — Part 2: Requirements for marking (IEC
61310-2:1995).
EN ISO 8030, Rubber and plastic hoses — Methods of test for flammibility (ISO 8030:1987)
ISO 3864, Safety colours and safety signs.
ISO 6805, Rubber hoses and hose assemblies for underground mining — Wire-reinforced hydraulic types for coal
mining — Specification.
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions, together, where appropriate, with
those given in EN 1070:1998 apply:
3.1
armoured face conveyor
conveying device used to transport mineral and rock in a steel plate line pan by means of the scrapers of a chain
assembly
3.2
conveyor drive
assembly comprising drive frame, sprocket gearbox, coupling and motor
3.3
return unit
assembly comprising frame and sprocket
3.4
chain assembly
comprising of scrapers and link chain
3.5
sprocket
drive element which can transmit motor torque and the resulting movement to the chain assembly
3.6
scraper
element in the chain assembly which pushes conveyed rock and mineral
3.7
tensioning device
means of tensioning the chain assembly
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EN 12321:2003 (E)
3.8
chainlocking device
means of preventing movement of the chain assembly at the coupling and de-coupling point
3.9
anchorage
means of securing the armoured face conveyor or drive frame against uncontrolled movement
3.10
line pan
intermediate components between the two ends of the conveyor designed to carry the chain assembly/mineral and
rock
3.11
furnishings
auxiliary equipment attached to the armoured face conveyor
4 List of significant hazards
Table 1 — List of significant hazards with associated requirements
EN Hazards according to EN 1050:1996 Relevant clause/subclause of
1050:1996 annex A this standard
annex A
1 Mechanical hazards due to:
- machine parts or workpieces, e.g.:
5.9.2
a) shape;
5.6.1, 5.10, 5.2.1, 5.3.2
b) relative location;
c) mass and stability;
d) mass and velocity (kinetic energy of
5.7, 5.9.2
elements in controlled or uncontrolled motion);
e) inadequacy of mechanical strength;
5.11.1
1.1 Crushing hazard 5.2, 5.3, 5.8, 5.9.1, 5.10, 5.11.1,
5.11.2
1.2 Shearing hazard 5.2, 5.3, 5.8, 5.10, 5.11.1, 5.11.2
1.3 Cutting or severing hazard 5.2, 5.3, 5.8, 5.10, 5.11.1, 5.11.2
1.4 Entanglement hazard 5.2, 5.3, 5.8, 5.10, 5.11.1, 5.11.2
1.5 Drawing-in or trapping hazard 5.2, 5.3, 5.8, 5.10, 5.11.1, 5.11.2
1.6 Impact hazard 5.2, 5.3, 5.7, 5.9, 5.10, 5.11.1,
5.11.2
1.8 Friction or abrasion hazard 5.2, 5.3, 5.11.1
1.9 High pressure fluid injection hazard 5.5.3, 5.6.1
2 Electrical hazard due to:
2.1 Contact of person with live parts (direct 5.8
contact)
3 Thermal hazards, resulting in:
3.1 Burns and scalds by contact with objects or 5.4, 5.5.3, 5.8, 5.10
materials with an extreme high or low
temperature, by flames or explosions and also
by the radiation of heat sources
7 Hazards generated by materials and
substances (and their constituent elements)
processed or used by the machinery
7.1 Hazards from contact with or inhalation of 5.5.2, 5.8, 5.10
harmful fluid, gases, mists, fumes and dusts
7.2 Fire or explosion hazard 5.4
8 Hazards generated by neglecting
ergonomic principles in machinery design,
e.g. hazards from:
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EN 12321:2003 (E)
Table 1 (continued)
EN Hazards according to EN 1050:1996 Relevant clause/subclause of
1050:1996 annex A this standard
annex A
8.1 Unhealthy postures or excessive effort 5.1.2, 5.6.2, 5.9.1, 5.9.2
8.6 Human error 5.1.2, 5.9.2
8.7 Inadequate design, location or identification of 5.1.2
manual controls
8.8 Inadequate design or location of visual display 5.1.2
units
10 Unexpected start-up/over-run/over-speed
(or any similar malfunction) from:
10.2 Restoration of energy supply after an 5.2
interruption
11 Impossibility of stopping the machine in the 5.3.4
best possible conditions
14 Failure of the control circuit 5.3
15 Errors of fitting 5.9.2
17 Falling or ejected objects or fluids 5.7, 5.9.2
18 Loss of stability/overturning of machinery 5.9.1
19 Slip, trip and fall of persons (related to 5.5.3
machinery)
Additional hazards, hazardous situations and hazardous events due to mobility
22 Due to the control system:
22.1 Inadequate location of manual controls 5.3.2
23 From handling the machine (lack of stability)
25 From/to third persons:
25.1 Unauthorised start-up/use 5.2.4, 5.2.2, 5.3.3
25.2 Drift of a part away from its stopping position 5.3.4
25.3 Lack or inadequacy of visual or acoustic 5.2
warning means
26 Insufficient instructions for the 5.4
driver/operator
Additional hazards due to underground work
30 Mechanical hazards/events due to:
32 Fire and explosion 5.4, 5.6.1
5 Safety requirements/protective measures
5.1 General
5.1.1 Initial requirements
The extent to which hazards are covered is indicated in the scope of this standard. In addition machinery shall
conform to EN 292-1 and EN 292-2 for hazards which are not covered by this standard.
For the application of EN 457, EN 953 and EN 982 the manufacturer shall carry out an adequate risk assessment
for the requirements thereof where choice is necessary.
NOTE This specific risk assessment is part of the general risk assessment relating to the hazards not covered by this C
standard.
5.1.2 Control systems
Control devices shall be designed, arranged and marked in accordance with EN 894 and have dimensions
conforming to EN 547-3 so that they can be operated easily and safely. Minimum distances shall be as follows:
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EN 12321:2003 (E)
a) 50 mm for operating handles that require a force of > 50 N;
b) 25 mm for operating handles that require a force of < 50 N;
c) 10 mm between rows of push buttons or switches;
d) 15 mm between separate push buttons;
Control devices shall be designed such that intentional human action is needed. Control devices shall be so
designed, arranged or protected that they cannot be operated accidentally, which could lead to a hazardous
situation.
5.2 Starting
5.2.1 Pre-start warning
The armoured face conveyor shall be provided with audible pre-start warning systems conforming to EN 457. The
intention is
...