oSIST prEN ISO 4254-19:2022

Agricultural machinery - Safety - Part 19: Feed mixing machines (ISO/DIS 4254-19:2022)

This document, used together with ISO 4254-1, specifies the safety requirements and their verification
for the design and construction of mounted, semi-mounted, trailed or self-propelled machines that have a combination of two or more of the following functions: loading, mixing, chopping and distributing
silage and/or other feedstuffs or materials used for animal bedding such as straw, to be used by one
operator only. It includes those fitted with a built-in loading crane. In addition, it specifies the type of
information on safe working practices to be provided by the manufacturer.

Landmaschinen - Sicherheit - Teil 19: Futtermischwagen (ISO/DIS 4254-19:2022)

Matériel agricole - Sécurité - Partie 19: Machines de mélange des aliments (ISO/DIS 4254-19:2022)

Kmetijski stroji - Varnost - 19. del: Stroji za mešanje krme (ISO/DIS 4254-19:2022)

General Information

• Status: Not Published
• Public Enquiry End Date: 30-Jun-2022
• ICS: 65.060.99 - Other agricultural machines and equipment
• Technical Committee: IMKG - Machinery for agriculture and forestry
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 21-Apr-2022
• Due Date: 08-Sep-2022
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Mandate: M/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
• Ref Project: prEN ISO 4254-19 - Agricultural machinery - Safety - Part 19: Feed mixing machines (ISO/DIS 4254-19:2022)

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN ISO 4254-19:2022
01-junij-2022

Kmetijski stroji - Varnost - 19. del: Stroji za mešanje krme (ISO/DIS 4254-19:2022)

Agricultural machinery - Safety - Part 19: Feed mixing machines (ISO/DIS 4254-19:2022)

Landmaschinen - Sicherheit - Teil 19: Futtermischwagen (ISO/DIS 4254-19:2022)

Matériel agricole - Sécurité - Partie 19: Machines de mélange des aliments (ISO/DIS

4254-19:2022)
Ta slovenski standard je istoveten z: prEN ISO 4254-19
ICS:
65.060.99 Drugi kmetijski stroji in Other agricultural machines
oprema and equipment
oSIST prEN ISO 4254-19:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 4254-19:2022
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oSIST prEN ISO 4254-19:2022
DRAFT INTERNATIONAL STANDARD
ISO/DIS 4254-19
ISO/TC 23/SC 3 Secretariat: DIN
Voting begins on: Voting terminates on:
2022-04-13 2022-07-06
Agricultural machinery — Safety —
Part 19:
Feed mixing machines
ICS: 65.060.99
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 4254-19:2022(E)
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. © ISO 2022
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oSIST prEN ISO 4254-19:2022
ISO/DIS 4254-19:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

or ISO’s member body in the country of the requester.
ISO copyright office
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Phone: [phone]
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Website: www.iso.org
Published in Switzerland
© ISO 2022 – All rights reserved
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oSIST prEN ISO 4254-19:2022
ISO/DIS 4254-19:2022(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 2

3.1 Machines ...................................................................................................................................................................................................... 2

3.2 Functions ..................................................................................................................................................................................................... 2

4 Safety requirements and/or protective risk reduction measures .................................................................4

4.1 General ........................................................................................................................................................................................................... 4

4.2 Machine controls .................................................................................................................................................................................. 4

4.2.1 Controls located on the workstation or in the operator’s station .......................................... 4

4.2.2 Remote controls .................................................................................................................................................................. 4

4.2.3 Emergency stop ................................................................................................................................................................... 4

4.3 Visibility ....................................................................................................................................................................................................... 5

4.3.1 Visibility of work areas of cutting, loading and cutting/loading devices ....................... 5

4.4 Loading devices ..................................................................................................................................................................................... 8

4.4.1 General ........................................................................................................................................................................................ 8

4.4.2 Loading door .......................................................................................................................................................................... 9

4.5 Cutting devices ....................................................................................................................................................................................... 9

4.5.1 General ........................................................................................................................................................................................ 9

4.5.2 Stopping time...................................................................................................................................................................... 10

4.5.3 Maintenance and repair ............................................................................................................................................ 10

4.5.4 Blockages................................................................................................................................................................................ 11

4.6 Mixing/chopping device .............................................................................................................................................................. 11

4.6.1 Guarding for a machine equipped with cutting, loading, or cutting/loading

tools ........................................................................................................................................... .................................................. 11

4.6.2 Guarding for a machine equipped with distribution device ....................................................12

4.7 Mixing/chopping chamber ........................................................................................................................................................13

4.7.1 Viewing inside chamber............................................................................................................................................13

4.7.2 Reducing material build-up ................................................................................................................................... 13

4.7.3 Manual addition of material .................................................................................................................................. 14

4.7.4 Maintenance and repair ............................................................................................................................................ 14

4.8 Moving floor ........................................................................................................................................................................................... 14

4.9 Distribution device .......................................................................................................................................................................... 14

4.9.1 General ..................................................................................................................................................................................... 14

4.9.2 Conveyors .............................................................................................................................................................................. 15

4.9.3 Augers ....................................................................................................................................................................................... 15

4.9.4 Distributor cylinders ................................................................................................................................................... 15

4.9.5 Impellers ................................................................................................................................................................................. 16

4.10 Scale display........................................................................................................................................................................................... 24

4.11 Noise ............................................................................................................................................................................................................. 25

4.11.1 Noise reduction as a safety requirement ................................................................................................... 25

4.11.2 Verification of requirements on noise .......................................................................................................... 26

4.12 Stability and immobilization ................................................................................................................................................... 26

4.12.1 General ..................................................................................................................................................................................... 26

4.12.2 Supporting devices ........................................................................................................................................................26

4.13 Remote control .................................................................................................................................................................................... 27

4.14 Electro-magnetic compatibility (EMC) .......................................................................................................................... 27

5 Verification of the safety requirements and/or protective risk reduction measures ...........27

6 Information for use ........................................................................................................................................................................................28

6.1 Operator's manual ............................................................................................................................................................................28

6.1.1 General .....................................................................................................................................................................................28

6.1.2 Preparing the machine...............................................................................................................................................28

iii
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oSIST prEN ISO 4254-19:2022
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6.1.3 Operating the machine ...............................................................................................................................................28

6.1.4 Servicing and maintaining the machine ................................... ..................................................................29

6.1.5 Noise ...........................................................................................................................................................................................29

6.2 Marking ......................................................................................................................................................................................................29

6.2.1 General .....................................................................................................................................................................................29

6.2.2 Safety signs .......................................................................................................................................................................... 30

Annex A (informative) List of significant hazards .............................................................................................................................31

Annex B (informative) Examples of machines and components .........................................................................................34

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of Directive 2006/42/EC aimed to be covered .......................................................................... 44

Bibliography .............................................................................................................................................................................................................................47

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oSIST prEN ISO 4254-19:2022
ISO/DIS 4254-19:2022(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to

the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see

www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 23, Tractors and machinery for

agriculture and forestry, Subcommittee SC 3, Safety and comfort.
A list of all parts in the ISO 4254 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html.
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oSIST prEN ISO 4254-19:2022
DRAFT INTERNATIONAL STANDARD ISO/DIS 4254-19:2022(E)
Agricultural machinery — Safety —
Part 19:
Feed mixing machines
1 Scope

This document, used together with ISO 4254-1, specifies the safety requirements and their verification

for the design and construction of silage block cutters and feed mixing machines (for example

feed mixers, bale processors). Feed mixing machines can be stationary, mounted, semi-mounted,

interchangeable towed or self-propelled machines that have a combination of two or more of the

following functions: loading, mixing, chopping and distributing materials used for animal feed or

bedding. In addition, it specifies the type of information on safe working practices to be provided by the

manufacturer.
This document does not apply to:
— machines which pick up green fodder directly from the field;
— loading cranes not attached to a feed mixing machine;

— Autonomous feed mixing machines (including robotic feed systems dealt with in ISO 3991 (under

preparation))

This document deals with the significant hazards, hazardous situations and events relevant to machines

for loading, mixing and/or chopping and distributing silage and/or other feedstuffs, when they are used

as intended and under the conditions foreseen by the manufacturer as listed in Annex A, except for the

hazards arising from:
— failure of the control circuit;
— inadequate seating;
— inadequate lighting;
— travelling of machinery;
— break-up of parts rotating at high speed;

— cutting hazard during service on sharp parts (e.g. blades of the mixing and/or chopping device).

It is not applicable to environmental hazards (except noise). It does not deal with stability when

travelling.

This document is not applicable to machines manufactured before the date of publication of this

document.

Examples of machines and components covered by this document are shown in Annex B.

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.

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oSIST prEN ISO 4254-19:2022
ISO/DIS 4254-19:2022(E)

ISO 3600:2015, Tractors, machinery for agriculture and forestry, powered lawn and garden equipment —

Operator's manuals — Content and format
ISO 4254-1:2013, Agricultural machinery — Safety — Part 1: General requirements

ISO/TR 11688-1:1995, Acoustics — Recommended practice for the design of low-noise machinery and

equipment — Part 1: Planning

ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction

ISO 13851:2019, Safety of machinery — Two-hand control devices — Principles for design and selection

ISO 13855:2010, Safety of machinery — Positioning of safeguards with respect to the approach speeds of

parts of the human body

ISO 13857:2019, Safety of machinery — Safety distances to prevent hazard zones being reached by upper

and lower limbs

ISO 15817:2012, Earth-moving machinery — Safety requirements for remote operator control systems

3 Terms and definitions

For the purposes of this document, the following terms and definitions given in ISO 12100:2010 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1 Machines
3.1.1
feed mixer

machine with an open-top chamber and powered mixing/chopping device(s) for blending of feed stocks

and supplements, and a means for dispensing the blended material

Note 1 to entry: The mixing/chopping devices can consist of, but are not limited to, rotating augers, rotors (for

example paddles, ribbons, bars, knives), or a combination of augers and rotors.

Note 2 to entry: The mixer can be self-propelled, truck-mounted, trailer-mounted, or a stationary configuration.

3.1.2
bale processor

device with an open-top chamber and powered chopping elements intended to chop baled materials

and distribute the processed material
3.1.3
silage block cutter

device with cutting edge(s) that is used to cut a block of material from the remaining material and

transport the material for processing or distribution while maintaining the material density and form

3.2 Functions
3.2.1
mixing
operation to blend two or more different materials to create a mixture
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3.2.2
chopping

operation to break up or reduce the size of the constituent elements of a mass of material

3.2.3
cutting

operation to sever a portion of material from the remaining material loading device

3.3
loading device

element or set of elements attached to the machine that moves material into the chamber

3.3.1
loading crane

powered crane, attached to the machine, comprising a column, which pivots about a base, and a boom

system which is attached to the top of the column for loading material into the chamber

[SOURCE: EN 12999:2011, definition 3.1.1 modified]
3.3.2
loading door

moveable portion of the chamber that opens to serve a loading function of the machine and closes

during mixing or processing of material
3.3.3
loading conveyor
powered mechanism that continually moves material into the chamber
3.3.4
loading bucket

moveable chamber, attached to the machine that lifts material and dumps it into the chamber

3.4
cutting/loading device

element or set of elements attached to the machine, that alone or in combination, serve the functions of

a cutting device and a loading device.
3.5
mixing/chopping device

element or set of elements that blends or size reduces the material after being loaded into the chamber

3.6
cutting device

element or set of elements attached to the machine that performs the cutting function

3.7
distribution device

powered element or set of elements, attached to the machine, which moves the material from the

chamber to a desired location (for example conveyor, belt, auger, distributor cylinder, impeller, blower)

3.8
unloading door
moveable portion of the chamber that opens to unload material
3.9
moving floor

powered conveyor for moving the material within the chamber or on the loading door

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3.10
workstation

position on the machine, other than the operator's station, from which control of at least some machine

functions is possible
3.11
operator's station
position of the operator during machine operations including transport
4 Safety requirements and/or protective risk reduction measures
4.1 General

4.1.1 Machinery shall comply with the safety requirements or protective risk reduction measures of

this clause. In addition, the machine shall be designed according to the principles of relevant parts of

ISO 12100 for hazards relevant but not significant, which are not dealt with by this document.

4.1.2 Unless otherwise specified in this document, the machines shall comply with the requirements

of ISO 4254-1 and with ISO 13857:2019, Table 1, Table 3, Table 4 and Table 6 as appropriate.

4.2 Machine controls
4.2.1 Controls located on the workstation or in the operator’s station

4.2.1.1 Controls shall be designed so that the operator can reach them where intended, for example

by means of an adjustable position.

4.2.1.2 It shall not be possible for the operator to reach unguarded moving working elements while

actuating the control.

4.2.1.3 It shall not be possible to reach the controls from inside the mixing/chopping chamber(s).

4.2.1.4 Stop controls shall have priority over all other controls.
4.2.1.5 Workstation controls shall be hold-to-run.

4.2.1.6 It shall be possible to deactivate workstation functions to limit control to the operator’s

station only.
4.2.1.7 Two-hand controls shall comply with ISO 13851.
4.2.2 Remote controls

Remote operator-controlled machinery shall comply with the requirements as specified in ISO 15817.

4.2.3 Emergency stop

An emergency stop control according to ISO 4254-1:2013, 4.19 shall be installed on self-propelled

machines
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4.3 Visibility
4.3.1 Visibility of work areas of cutting, loading and cutting/loading devices
4.3.1.1 For work area at front of the machine

The operator shall have visibility of the work area at the front of the machine from the operator’s station

and/or the workstation.

The width of the work area is the entire width of any cutting, loading, and cutting/loading devices,

including any entrapment zones.

The height of the work area extends from the highest working position of any cutting, loading, and

cutting/loading devices to a height of 1 m or less from the ground when the machine is in its loading

position

The location of the work area is 200 mm measured from the edge of any cutting, loading, and cutting/

loading devices (see Figure 1). If direct visibility cannot be achieved, devices such as mirrors or closed-

circuit television (CCTV) shall be used to ensure indirect visibility.
Dimensions in millimetres
Key
1 eye position
2 cutting/loading device
3 visibility zone
Figure 1 — Checking of the direct visibility of a self-propelled machine
4.3.1.2 For work area at rear of the machine

The operator shall have visibility of the work area at the rear of the machine from the operator’s station

and/or the workstation.

The width of the work area is the entire width of any cutting, loading, and cutting/loading devices,

including any entrapment zones [see d2 of Figure 2b and 2d].

The height of the work area extends from the highest working position of any cutting, loading, and

cutting/loading devices to a height of 1,5 m or less from the ground when the machine is in its loading

position

NOTE The height of 1,5 m is under further investigation and may be replaced by 1,0 m

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oSIST prEN ISO 4254-19:2022
ISO/DIS 4254-19:2022(E)
The location of the work area is 200 mm to the rear of
— the edge of any cutting, loading, and cutting/loading devices; or
— the machine when the loading door is closed.

If direct visibility of the work area cannot be achieved, at least one of the following shall be achieved:

— indirect visibility through the use of devices such as mirrors or closed-circuit television (CCTV)

and a sound and/or light signal emitted during actuation of cutting, loading, and cutting/loading

devices; or
— a device(s) to detect persons in the hazard zone and inform the operator.
4.3.1.3 For work areas at sides of machine

The operator shall have visibility of the work area at the side of the machine from the operator’s station

and/or the workstation.

The width of the work area is 200 mm measured from the sides of any cutting, loading, and cutting/

loading devices of the machine [see d4 in Figures 2b and 2d)].

The height of the work area extends from the highest working position of any cutting, loading, and

cutting/loading devices to a height of 1.5 m or less from the ground when the machine is in its loading

position
The location of the work area is 200 mm to the rear of:

— indirect visibility through the use of devices such as mirrors or closed-circuit television (CCTV)

and a sound and/or light signal emitted during actuation of cutting, loading, and cutting/loading

devices
— a device(s) to detect persons in the hazard zone and inform the operator
4.3.1.4 Operator’s eye position

The position of the operator’s eye is determined as shown in Figure 1 and Figure 3. A lateral displacement

of the eye of the operator is allowed within ± 300 mm from the centre position.
a) Checking of the visibility for trailed machines with loading door - side view
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oSIST prEN ISO 4254-19:2022
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b) Checking of the visibility for trailed machines with loading door – top view

c) Checking of the visibility for trailed machines with cutting/loading tools – side view

d) Checking of the visibility for trailed machines with cutting/loading tools
Key

h highest position to a minimum height of 1,5 m from the ground of the work area of the cutting/loading tools

and the loading door
d1 width of the loading tools
d2 width of the visibility area - interior width of the machine
d3 excl
...