oSIST prEN 17923:2023
(Main)Equipment for vine cultivation and wine making - Safety - Must and grape harvest pumps
Equipment for vine cultivation and wine making - Safety - Must and grape harvest pumps
This document specifies the safety requirements for the design of must and grape harvest pumps and the means for verifying these requirements and gives information for the safe use of the machines covered.
This document applies to must and grape harvest pumps, as defined in 3.1, intended for the transfer of fresh, de-stemmed grapes and pomace.
This document deals with all significant hazards, hazardous situations or hazardous events relevant to grape harvest pumps, when it is used as intended and under conditions of misuse which are reasonably foreseeable by the manufacturer, specified in Annex B.
This document does not deal with hazardous phenomena associated with the integration of grape harvest pumps with other machinery.
This document does not give additional requirements for operations subject to special rules (e.g. explosive atmosphere, power supply from electrical networks where the voltage, frequency and tolerance differ from those of the public network).
This document is not applicable to:
— adaptations intended for other fruit harvests;
— pumps for building materials (covered by EN 12001 [1]);
— pumps on grape harvesters;
— reception conquests;
— machines upstream or downstream of the pump.
This document is not applicable to grape harvest pumps manufactured before the date of its publication.
Geräte für den Weinbau und die Weinherstellung - Sicherheit - Maische-, Most- und Wein-Pumpen
Dieses Dokument legt die Sicherheitsanforderungen für die Gestaltung von Maische- und Traubenerntepumpen und die Mittel zur Überprüfung dieser Anforderungen fest und enthält Informationen für die sichere Anwendung der behandelten Maschinen.
Dieses Dokument ist für Maische- und Traubenerntepumpen nach 3.1, die für den Transfer von frischen, entstielten Trauben und Trester vorgesehen sind, anwendbar.
Dieses Dokument behandelt alle signifikanten Gefährdungen, Gefährdungssituationen oder Gefährdungsereignisse in Bezug auf Traubenerntepumpen, wenn sie bestimmungsgemäß und unter den Bedingungen der durch den Hersteller vernünftigerweise vorhersehbaren Fehlanwendungen, wie in Anhang B festgelegt, verwendet werden.
Dieses Dokument behandelt keine gefahrbringenden Phänomene in Verbindung mit der Integration von Traubenerntepumpen in andere Maschinen.
Dieses Dokument enthält keine zusätzlichen Anforderungen für betriebliche Aktivitäten, die besonderen Vorschriften unterliegen (z. B. explosionsfähige Atmosphäre, Stromversorgung aus Stromnetzen, deren Spannung, Frequenz und Toleranz von dem öffentlichen Netzwerk abweichen).
Dieses Dokument ist nicht anwendbar auf:
— für andere Obsternten vorgesehene Anpassungen;
— Pumpen für Baustoffe (behandelt in EN 12001 [1]);
— Pumpen an Traubenerntemaschinen;
— Aufnahmekonzepte;
— der Pumpe vor- oder nachgelagerte Maschinen.
Dieses Dokument gilt nicht für Traubenerntepumpen, die vor dem Datum der Veröffentlichung dieses Dokuments hergestellt wurden.
Matériel viti-vinicole - Sécurité - Pompes à vendange
Le présent document spécifie les prescriptions de sécurité pour la conception et les moyens pour la vérification de ces prescriptions et donne les informations pour l’utilisation en sécurité des machines couvertes.
Le présent document s’applique aux pompes à vendange tels que définies au 3.1 destinées au transfert de la vendange fraîche, égrappée et du marc de décuvage.
Le présent document traite tous les phénomènes dangereux, situations dangereuses ou événements dangereux significatifs qui sont pertinents pour les pompes à vendange, lorsqu'elles sont utilisées normalement et dans les conditions de mauvais usage raisonnablement prévisible par le fabricant, comme spécifié dans l’Annexe B.
Le présent document ne traite pas des phénomènes dangereux associés à l’intégration des pompes à vendange avec d’autres machines.
Le présent document ne donne pas de prescriptions supplémentaires pour des opérations sujettes à des règles spéciales (par exemple, atmosphère explosible, alimentation par réseaux électriques lorsque la tension, la fréquence et la tolérance diffèrent de celles du réseau public).
Le présent document ne s’applique pas :
— aux adaptations destinées à d’autres récoltes fruitières ;
— aux pompes pour matériaux de construction (couvertes par l’EN 12001[1]) ;
— aux pompes sur bennes à vendange ;
— aux conquêts de réception;
— aux machines en amont ou en aval de la pompe.
Ce document ne s'applique pas aux pompes à vendange fabriquées avant sa date de publication.
Oprema za vinogradništvo in proizvodnjo vina - Varnost - Črpalke za mošt in proizvode iz grozdja
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 17923:2023
01-marec-2023
Oprema za vinogradništvo in proizvodnjo vina - Varnost - Črpalke za mošt in
proizvode iz grozdja
Equipment for vine cultivation and wine making - Safety - Must and grape harvest pumps
Geräte für den Weinbau und die Weinherstellung - Sicherheit - Maische-, Most- und
Wein-Pumpen
Matériel viti-vinicole - Sécurité - Pompes à vendange
Ta slovenski standard je istoveten z: prEN 17923
ICS:
65.060.60 Vinogradniška in vinarska Viticultural and wine-making
oprema equipment
oSIST prEN 17923:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 17923:2023
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oSIST prEN 17923:2023
DRAFT
EUROPEAN STANDARD
prEN 17923
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2022
ICS 65.060.60
English Version
Equipment for vine cultivation and wine making - Safety -
Must and grape harvest pumps
Matériel viti-vinicole - Sécurité - Pompes à vendange Geräte für den Weinbau und die Weinherstellung -
Sicherheit - Maische-, Most- und Wein-Pumpen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 144.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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 CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17923:2022 E
worldwide for CEN national Members.
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oSIST prEN 17923:2023
prEN 17923:2022 (E)
Contents . Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 8
4 Safety requirements and/or protective/risk reduction measures . 9
4.1 General . 9
4.2 Requirements common to all machines . 9
4.2.1 Hazardous electrical phenomena . 9
4.2.2 Switching on . 10
4.2.3 Emergency stop device . 10
4.2.4 Remote control . 10
4.2.5 Ergonomics . 10
4.2.6 Stability in use and storage . 11
4.2.7 Moving the machine . 11
4.2.8 Prevention of contact of lower limbs with moving parts involved in the working process 11
4.2.9 Reduction of the risk of contact of upper limbs with moving parts involved in the working
process 17
4.2.10 Preventing blockages and risks during breaking-in . 17
4.2.11 Outlet pipe of the grape harvest pump . 17
4.2.12 Emptying . 19
4.2.13 Noise . 20
4.3 Prevention of the burning hazard . 21
5 Verification of the safety requirements and/or protective/risk reduction measures . 21
6 Information for use . 23
6.1 General . 23
6.2 Signals and warning devices . 23
6.3 Accompanying documents . 27
6.3.1 Instruction handbook . 27
6.3.2 Marking . 29
Annex A (informative) Examples of grape harvest pumps and their application . 31
Annex B (informative) List of significant hazards . 39
Annex C (informative) Examples of technical measures for noise abatement . 42
Annex D (normative) Noise test code for the declaration of noise emission values (accuracy grade 2)
. 43
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Annex E (normative) Foot probe test for must and grape harvest pumps intended for devatting . 47
Annex F (informative) Test regarding prevention of mobility hazards in storage and during manual
handling . 50
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2006/42/EC aimed to be covered . 51
Bibliography . 53
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oSIST prEN 17923:2023
prEN 17923:2022 (E)
European foreword
This document (prEN 17923:2022) has been prepared by Technical Committee CEN/TC 144
“Tractors and machinery for agriculture and forestry”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of
EU Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral
part of this document.
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Introduction
This document is a type-C standard as stated in EN ISO 12100:2010.
This document is of relevance, in particular, for the following stakeholder groups representing the
market players with regard to machinery safety:
— machine manufacturers (small, medium and large enterprises);
— health and safety bodies (regulators, accident prevention organizations, market surveillance
etc.).
Others can be affected by the level of machinery safety achieved with the means of the document by
the above-mentioned stakeholder groups:
— machine users/employers (small, medium and large enterprises);
— machine users/employees (e.g. trade unions, organizations for people with special needs);
— service providers, e.g. for maintenance (small, medium and large enterprises);
— consumers (in case of machinery intended for use by consumers).
The above-mentioned stakeholder groups have been given the possibility to participate in the
drafting process of this document.
The machinery concerned and the extent to which hazards, hazardous situations or hazardous events
are covered are indicated in the Scope of this document. These hazards are specific to must and grape
harvest pumps.
When requirements of this type-C standard are different from those which are stated in type-A or
type-B standards, the requirements of this type-C standard take precedence over the requirements
of the other standards for machines that have been designed and built according to the requirements
of this type-C standard.
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1 Scope
This document specifies the safety requirements for the design of must and grape harvest pumps and
the means for verifying these requirements and gives information for the safe use of the machines
covered.
This document applies to must and grape harvest pumps, as defined in 3.1, intended for the transfer
of fresh, de-stemmed grapes and pomace.
This document deals with all significant hazards, hazardous situations or hazardous events relevant
to grape harvest pumps, when it is used as intended and under conditions of misuse which are
reasonably foreseeable by the manufacturer, specified in Annex B.
This document does not deal with hazardous phenomena associated with the integration of grape
harvest pumps with other machinery.
This document does not give additional requirements for operations subject to special rules (e.g.
explosive atmosphere, power supply from electrical networks where the voltage, frequency and
tolerance differ from those of the public network).
This document is not applicable to:
— adaptations intended for other fruit harvests;
— pumps for building materials (covered by EN 12001 [1]);
— pumps on grape harvesters;
— reception conquests;
— machines upstream or downstream of the pump.
This document is not applicable to grape harvest pumps manufactured before the date of its
publication.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
EN 614-1:2006+A1:2009, Safety of machinery - Ergonomic design principles - Part 1: Terminology and
general principles
EN 620:2021, Continuous handling equipment and systems - Safety requirements for fixed belt
conveyors for bulk materials
EN 894-1:1997+A1:2008, 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 894-2:1997+A1:2008, Safety of machinery - Ergonomics requirements for the design of displays and
control actuators - Part 2: Displays
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EN 894-3:2000+A1:2008, Safety of machinery - Ergonomics requirements for the design of displays and
control actuators - Part 3: Control actuators
EN ISO 11201:2010, Acoustics - Noise emitted by machinery and equipment - Determination of emission
sound pressure levels at a work station and at other specified positions in an essentially free field over a
reflecting plane with negligible environmental corrections (ISO 11201:2010)
EN ISO 11202:2010, Acoustics - Noise emitted by machinery and equipment - Determination of emission
sound pressure levels at a work station and at other specified positions applying approximate
environmental corrections (ISO 11202:2010)
EN ISO 12100:2010, Safety of machinery - General principles for design - Risk assessment and risk
reduction (ISO 12100:2010)
EN ISO 13732-1:2008, Ergonomics of the thermal environment - Methods for the assessment of human
responses to contact with surfaces - Part 1: Hot surfaces (ISO 13732-1:2006)
EN ISO 13849-1:2015, Safety of machinery - Safety-related parts of control systems - Part 1: General
principles for design (ISO 13849-1:2015)
EN ISO 13850:2015, Safety of machinery - Emergency stop function - Principles for design (ISO
13850:2015)
EN ISO 13856-2:2013, Safety of machinery - Pressure-sensitive protective devices - Part 2: General
principles for design and testing of pressure-sensitive edges and pressure-sensitive bars (ISO 13856-
2:2013)
EN ISO 13857:2019, Safety of machinery - Safety distances to prevent hazard zones being reached by
upper and lower limbs (ISO 13857:2019)
EN ISO 14118:2018, Safety of machinery - Prevention of unexpected start-up (ISO 14118:2017)
EN ISO 14119:2013, Safety of machinery - Interlocking devices associated with guards - Principles for
design and selection (ISO 14119:2013)
EN ISO 14120:2015, Safety of machinery - Guards - General requirements for the design and
construction of fixed and movable guards (ISO 14120:2015)
EN ISO 3744:2010, Acoustics - Determination of sound power levels and sound energy levels of noise
sources using sound pressure - Engineering methods for an essentially free field over a reflecting plane
(ISO 3744:2010)
EN ISO 4254-1:2015, Agricultural machinery - Safety - Part 1: General requirements (ISO 4254-1:2013)
EN ISO 4871:2009, Acoustics - Declaration and verification of noise emission values of machinery and
equipment (ISO 4871:1996)
EN ISO 7010:2012/A6:2016, Graphical symbols - Safety colours and safety signs - Registered safety
signs - Amendment 6 (ISO 7010:2011/Amd 6:2014)
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IEC 60204-1:2016+AMD1:2021, Safety of machinery - Electrical equipment of machines - Part 1:
General requirements
1
IEC 60529:1989+AMD1:1999+AMD2:2013, Degrees of protection provided by enclosures (IP Code)
ISO 11684:1995, Tractors, machinery for agriculture and forestry, powered lawn and garden
equipment — Safety signs and hazard pictorials — General principles
ISO 15077:2020, Tractors and self-propelled machinery for agriculture — Operator controls —
Actuating forces, displacement, location and method of operation
ISO 22883:2004, Castors and wheels — Requirements for applications up to 1,1 m/s (4 km/h)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
must and grape harvest
grape harvest
product resulting from the harvesting of grapes intended for wine production, which may be heated
for oenological purposes and is presented in one of the following forms: - full ; - pressed and / or
scratched;- drained;solid fermented (pomace for 3.5)
3.2
must and grape harvest pump
grape harvest pump
movable, stationary machine designed to transfer the must and grape harvest (3.1) by piping and
consisting of transfer/feeding elements (e.g. an auger driven by a motor and a volumetric pump)
Note 1 to entry: Figure A.1 illustrates an example of a must and grape harvest pump.
Note 2 to entry: If the harvest is fermented solid (devatting marc), the machine is generally called a “marc
pump”.
Note 3 to entry: Feeding can be manual, by an upstream machine or by an integrated belt conveyor.
Note 4 to entry: Examples of the use of grape harvest pumps are illustrated in Annex A.
1
As impacted by IEC 60529:1989/COR2:2015.
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3.3
reception
operation consisting in pouring the entire must and grape harvest directly into the hopper of the
must and grape harvest pump (3.2)
Note 1 to entry: An illustration of the reception application is shown in Figure A.2.
3.4
grape harvest transfer
operation consisting in moving the must and grape harvest (3.1) between two stages of vinification
EXAMPLE transfer between the destemmer (3.6) and the press or between the destemmer (3.6) and the
vat.
Note 1 to entry: An illustration of the transfer application is shown in Figure A.3.
3.5
devatting
removal of the grape pomace from the fermentation tanks
Note 1 to entry: An illustration of the devatting application is shown in Figure A.4.
3.6
destemmer
machine that removes the berries from the bunch of grapes
4 Safety requirements and/or protective/risk reduction measures
4.1 General
Machinery shall comply with the safety requirements and/or protective/risk reduction measures of
this clause. In addition, the machine shall be designed according to the principles of
EN ISO 12100:2010 for relevant but not significant hazards which are not dealt with by this
document.
The design shall take account of the internal oscillations which may cause damage to control devices
and protective devices and the need to provide devices to immobilise the machinery (brakes or
chocks).
4.2 Requirements common to all machines
4.2.1 Hazardous electrical phenomena
Electrical installations shall comply with IEC 60204-1:2016+AMD1:2021.
The degree of protection of electrical installations shall be at least IP 55 according to
2
IEC 60529:1989+AMD1:1999+AMD2:2013 .
2
As impacted by IEC 60529:1989/COR2:2015.
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4.2.2 Switching on
4.2.2.1 Service bodies
The design and spacing of the controls shall allow unimpeded operation and unintentional actuation
of other controls in accordance with ISO 15077:2020. The expected results/effects of actions on the
activation controls shall be specified (see ISO 15077:2020, 4.1.1), e.g. through the use of markings
near the controls.
Where a control device is designed and constructed to allow several different actions, i.e. its action
may be ambiguous, the action ordered shall be displayed in clear text and, if necessary, confirmed.
The location of the operating elements shall be such that the operator has a direct view of the working
parts of the machine.
A power-on indicator light shall be provided on the control panel and, if applicable, on the
remote control box.
4.2.2.2 Protection against unintentional operation
The switch-on control shall be designed to prevent unintentional operation, e.g. several movements
required to operate the control, a screen on the control, a button with collar.
4.2.2.3 Protection against unintentional switching on (lockout)
Control devices shall comply with EN ISO 14118:2018.
Restarting under operating conditions can be achieved by the voluntary actuation of a device other
than the normal starting device, placed so that the hopper is visible from the control station.
4.2.3 Emergency stop device
Each control station of the machine shall be equipped with an emergency stop device. Emergency
stop devices shall comply with EN ISO 13850:2015.
The emergency stop device shall be of category 0.
4.2.4 Remote control
If a remote control box is supplied with the machine, it shall be wired and its design shall be such that
the operator has a direct view of the working parts of the machine.
The remote control units shall be regarded as control stations of the machine and comply with the
requirements of 4.2.1.
If there are several control units on the machine, a function (e.g. start, stop, opening) shall only be
operated from one control unit at a time. It shall be possible to change the priority from one control
unit to another.
The control system shall comply with EN ISO 13849-1:2015, performance level c.
4.2.5 Ergonomics
The general principles and requirements of EN 614-1:2006+A1:2009, EN 894-1:1997+A1:2008,
EN 894-2:1997+A1:2008 and EN 894-3:2000+A1:2008 shall be used for ergonomic aspects.
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Gripping handles shall be provided on the machine to facilitate movement while limiting postural
constraints. These handles shall be positioned at a height of between 0,75 m and 1,10 m from the
ground.
When moving, the structure shall not hinder the movements of the operator's lower limbs.
The handling of the guards shall be taken into account during the design, in particular by limiting the
mass of the parts to be handled to 25 kg and by equipping them with gripping means.
4.2.6 Stability in use and storage
The machinery shall be designed to be stable as specified in EN ISO 4254-1:2015, 6.2.1.1 and 6.2.1.3.
Functional test shall be carried out in accordance with F.2.
Machinery fitted with wheels for manual displacement/travelling shall be designed in such a way as
to prevent overturning.
Functional test shall be carried out in accordance with F.3.
The wheel set shall support the maximum working load of the machine. Wheels shall be selected and
tested in accordance with ISO 22883:2004.
A locking system shall be able to keep the machine stationary when in use or when travelling on an
8,5° slope.
4.2.7 Moving the machine
The pump shall be able to be moved and positioned by one person.
If the machine is to be lifted by lifting gear, then means shall be provided to ensure that the machine
is held in place and to prevent it from tipping over (e.g. sleeves).
If the machine stands on wheels, it shall pass the displacement test described in F3.
4.2.8 Prevention of contact of lower limbs with moving parts involved in the working
process
4.2.8.1 General
The machine shall be equipped with a guard allowing a fluid circulation of the harvest avoiding
blockages.
Fixed and movable guards shall comply with EN ISO 14120:2015, except Annexes B and C, which are
not relevant.
Interlocking guard with or without guard locking shall comply with EN ISO 14119:2013.
For the hopper, a special tool supplied with the machine shall be required to disassemble the fixed
guard.
If the guard can be dismantled or moved, it shall be combined with a locking device. The rotation of
the worm screw shall be controlled by the guard locking device, so that opening the guard stops the
screw movement within 0,5 s. The control system performing the stop function in connection with
the locking device shall meet Performance Level c, in accordance with EN ISO 13849-1:2015.
Closing the removable or moveable guard shall not cause the grape harvest pump to be restarted.
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For removable or movable guards, a device shall prevent the operation of the machine when the
configuration is not that intended for the guard, e.g. by means of a key transfer system as described
in EN ISO 14119:2013, B.2.
For machines intended for devatting, the guard shall comply with 4.2.8.2.
For machines intended for use under an upstream machine (e.g. a grape harvesting skip, de-stemmer,
rammer or de-stemmer-rammer), the guard shall comply with 4.2.8.3.
For machines intended for use in manual grape harvest reception, the guard shall comply with 4.2.8.4.
4.2.8.2 Special case of machines for devatting
4.2.8.2.1 Machines for feeding at height < 500 mm
In order to feed the hopper of the grape harvest pump below 500 mm from the ground, an additional
device, either integrated or independent (see Figure 1), is required to transport the product to the
hopper.
When the additional device is integrated in the pump, if this device is a belt conveyor, it shall comply
with EN 620:2021. See example in Figure 1.
The openings and safety distances of the grape harvest pump guards shall comply with
EN ISO 13857:2019, Table 7.
If there is a conveyor belt, the pump shall be provided with points for connection to the water system
for routine cleaning of the conveyor belt. The drain holes can fulfil this function.
For machines fed by an independent conveyor, 4.2.8.3 shall be complied with.
In addition to EN 620:2021, the conveyors shall be designed for quick (less than 1 min) and easy
(without tools) dismantling for easy cleaning. Splashes and liquid leaks shall be prevented by means
of extensions or drains.
Figure 1 — Example of a pump in devatting application with conveyor belt
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4.2.8.2.2 Machines for feeding at height ≥ 500 mm
The machinery shall be designed to prevent contact with the moving parts involved in the working
process, without preventing the passage of material. This requirement is considered to be satisfied
if:
— 4.2.8.1 is complied with, or
— the entire filling opening of the hopper is equipped with a multi-part, multi-level guard with:
— an opening (x) for the passage of the product, which shall be greater than 120 mm, and
— a direct-access guard with openings (y) not less than the dimensions shown in Table 1, and
— an overlap (z) between the two parts so as to prevent direct access to the danger zone, for
example, by a baffle guard, as shown in Figure 2, or
— any other preventive or protective measure which provides at least equivalent protection.
NOTE When devatting, it is possible that an overhang constitutes an obstacle to access to the vat.
In addition, it is permitted that the machine is equipped with equipment to facilitate the flow of
material, e.g. vibrator.
Table 1 — Dimensions of guard openings
Guard (bars), unidirectional type
a h
mm mm
= 60 ≥ 180
a = bars spacing, in mm (see Figure 2)
h = minimum permissible distance between the outer path of the movable transfer elements
(screw) and the guard, in mm (see Figure 2)
These spacings between bars or mesh widths are the best compromise between safety and the
performance required for the passage of the harvest (smaller spacing can retain large materials).
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Key
a maximum permissible bar spacing
h minimum permissible spacing between the external path of the moving transfer elements (worm gear)
and the safety guard
Figure 2 — Guard (bars), unidirectional type
For manually fed machines, the openings and safety clearances of guards with indirect access as
shown in Figure 3 shall be tested with the foot probe as described in Annex E.
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