KNECHT HV 25-1 User manual

Status 07.2022 Version 1.0 | Translation
Operating Instructions
Circular Knife Grinding Attachment
HV 25-1 | HV 25-2
HV 25-2
HV 25-1

3
Circular Knife Grinding Attachment HV 25-1 | HV 25-2
Manufacturer
KNECHT Maschinenbau GmbH
Witschwender Straße 26
88368 Bergatreute
Germany
Phone [phone]
Fax [phone]
[email protected]
www.knecht.eu
Documents for machine operator
Operating Instructions
Date of issue of the operating instructions
July 29, 2022
Copyright
The copyright for these operating instructions as well as other documents for the machine operator is held
by KNECHT Maschinenbau GmbH. They are provided only to customers and operators of our products and
are included with the machine.
These documents may neither be reproduced, nor made accessible to third parties, in particular rival firms,
without our express permission.
Operating Instructions

4
1. Important notes 7
1.1 Preface to the operating instructions 7
1.2 Warnings and symbols in the operating instructions 7
1.3 Figure and item numbers in the operating instructions 8
2. Safety 9
2.1 Basic safety instructions 9
2.1.1 Observe notes in the operating instructions 9
2.1.2 Obligation on the part of the operator 9
2.1.3 Obligation on the part of the personnel 9
2.1.4 Hazards involved in handling the circular knife grinding attachment 9
2.1.5 Malfunctions 10
2.2 Intended use 10
2.3 Warranty and liability 10
2.4 Safety regulations 11
2.4.1 Organizational measures 11
2.4.2 Protective equipment 11
2.4.3 Informal safety measures 11
2.4.4 Selection and qualification of personnel 11
2.4.5 Machine control system 12
2.4.6 Safety measures in normal operation 12
2.4.7 Hazards due to electrical power sources 12
2.4.8 Particular hazard areas 12
2.4.9 Servicing (maintenance, repair) and fault rectification 12
2.4.10 Structural alterations to the circular knife grinding attachment 13
2.4.11 Cleaning the circular knife grinding attachment 13
2.4.12 Lubricants/oils and greases 13
2.4.13 Relocation of the grinding machine with circular knife grinding attachment 13
3. Description 14
3.1 Intended use 14
3.2 Technical specifications 14
3.2.1 Circular knife grinding attachment HV 25-1 14
3.2.2 Circular knife grinding attachment HV 25-2 15
3.3 Functional description 15
3.4 Assembly description 16
3.4.1 Circular knife grinding attachment HV 25-1 for circular knives d. 80–250 mm 16
3.4.2 Circular knife grinding attachment HV 25-2 for circular knives d. 250–470 mm 17
4. Transport 18
4.1 Transport aids 18
Table of Contents

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4.2 Transport damage 18
4.3 Transport to another installation site 18
5. Installation 19
5.1 Selection of qualified personnel 19
5.2 Installation site 19
5.3 Settings 19
5.4 Initial start-up of the circular knife grinding attachment 19
6. Commissioning 20
6.1 Mounting the Circular knife grinding attachment HV 25-1 | HV 25-2 20
7. Operation 23
7.1 Grinding circular knives d. 80–250 mm on the grinding wheel 23
7.1.1 Clamping the circular knife 23
7.1.2 Positioning the circular knife on the grinding wheel 25
7.1.3 Swiveling the circular knife grinding attachment 25
7.1.4 Setting the grinding angle 26
7.1.5 Grinding the circular knife 27
7.1.6 Deburring the circular knife 28
7.2 Grinding circular knives d. 250–470 mm on the grinding wheel 29
7.2.1 Clamping the circular knife 29
7.2.2 Positioning the circular knife on the grinding wheel 31
7.2.3 Setting the grinding angle 31
7.2.4 Grinding the circular knife 33
7.2.5 Deburring the circular knife 34
8. Care and maintenance 35
8.1 Cleaning 35
8.1.1 Lubricant table 35
8.2 Maintenance plan (one-shift operation) 35
9. Disassembly and disposal 36
9.1 Disassembly 36
9.2 Disposal 36
Table of Contents

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10. Service, spare parts and accessories 37
10.1 Postal address 37
10.2 Service 37
10.3 Spare parts 37
10.4 Accessories 38
10.4.1 Abrasives used, etc. 38
11. Appendix 39
11.1 EU Declaration of Conformity 39
Table of Contents

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1.1 Preface to the operating instructions
These operating instructions are intended to make it easy to learn how to use the circular knife
grinding attachment and to properly utilize its features.
These operating instructions contain important notes on how to operate the circular knife grind-
ing attachment safely, properly, and efficiently. Your attention helps to avoid hazards, reduce
repair costs and downtimes, and to increase the reliability and service life of the circular knife
grinding attachment.
The operating instructions must always be stored in the location that the circular knife grinding
attachment is used.
The operating instructions must be read and applied by every person tasked with working with
the circular knife grinding attachment, e.g.:
• transport, installation, commissioning
• operation, including error rectification during operation, as well as
• servicing (maintenance, repair).
Recognized technical standards for safe and professional work must be observed in addition to
these operating instructions and the binding accident prevention regulations applicable in the
country of use and at the place of use.
1.2 Warnings and symbols in the operating instructions
The operating instructions use the following symbols/designations that must be followed:
The hazard triangle with the signal word “CAUTION” serves as a work
safety notice for all work for which there is a risk of personal injury or
death.
In these cases, work should be done with special attention and care.
ATTENTION
“ATTENTION” is written in places where special attention must be paid to
prevent damage or destruction of the grinding machine or its surroundings.
NOTE ”NOTICE” refers to user tips and especially useful information.
1. Important notes
CAUTION

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1.3 Figure and item numbers in the operating instructions
If the text refers to a component of the machine which is shown in a picture, the figure and
position number is given in brackets.
Example: (7-17/1) means picture number 7-17, position 1.
Fit the mounting flange d.70 mm (7-17/1) with the hole
(7-17/2) facing downwards onto the locating locating bolt
(7-17/3).
1. Important notes
Figure 7-17 Holding flange d. 70
2
1
3

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2.1 Basic safety instructions
2.1.1 Observe notes in the operating instructions
The basic prerequisite for safe handling and uninterrupted operation of this circular knife grinding
attachment is knowledge of the basic safety instructions and regulations.
• These operating instructions contain important notes on how to operate the circular knife
grinding attachment safely.
• All persons carrying out work on the circular knife grinding attachment must follow these
operating instructions, in particular the safety notices.
• In addition, the rules and regulations regarding accident prevention at the place of use are to
be observed.
2.1.2 Obligation on the part of the operator
The operator is obliged to allow only those persons to work on the circular knife grinding
attachment, who
• are familiar with the basic occupational safety and accident prevention regulations and have
received instruction in handling the circular knife grinding attachment,
• have read and understood the operating instructions, in particular the section entitled “Safety”
and the warning notes, and have provided signed confirmation of this.
The safety-awareness of the personnel at work will be monitored at regular intervals.
2.1.3 Obligation on the part of the personnel
All personnel working on the circular knife grinding attachment shall be obliged, before starting
work, to
• observe basic occupational safety and accident prevention regulations,
• read the operating instructions, particularly the section entitled “Safety” and the warning notes,
and provide signed confirmation that they have understood them.
2.1.4 Hazards involved in handling the circular knife grinding attachment
The circular knife grinding attachment has been built to the latest technological standards and the
recognized rules of technical safety. In spite of this, its use poses inherent risks which could result
in bodily harm or even death of the user or third persons, or damage to the circular knife grinding
attachment or other property.
The circular knife grinding attachment may only be used
• for its intended purpose, and
2. Safety

10
• in faultless condition with regard to safety-related aspects.
Malfunctions that may impair safety are to be eliminated immediately.
2.1.5 Malfunctions
If safety-relevant malfunctions occur with the circular knife grinding attachment, or if the
processing behavior indicates that such malfunctions may have occurred, the circular knife
grinding attachment must be stopped immediately and until such time as the malfunction has
been found and eliminated.
Allow only authorized trained personnel to eliminate the malfunctions.
2.2 Intended use
The circular knife grinding attachment is only for grinding circular knives from 80-250 mm
(HV 25-1) and 250-470 mm (HV 25-2). It is meant to be installed onto KNECHT grinding machines
of the S 20 series only.
All circular knives must be clamped onto corresponding holding fixtures. First, check whether the
holding fixture matches the knife to be ground. The knife can only be ground if this is the case.
Any other use is considered to be improper. KNECHT Maschinenbau GmbH is not liable for any
damage arising from this. The user alone bears this risk.
Use as intended includes the observance of all the notes in the operating instructions.
ATTENTION The circular knife grinding attachment is
being used improperly if, for example
• it is installed onto grinding machines other
than the KNECHT S 20 series,
• the circular knife has been clamped incor-
rectly,
• fixtures are not properly attached.
2.3 Warranty and liability
Warranty and liability claims in case of personal injury or property damage are excluded if such
damage is attributable to one or more of the following causes:
• improper use of the circular knife grinding attachment,
• improper transport, commissioning, operation, and maintenance of the circular knife grinding
attachment,
2. Safety

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• operating the circular knife grinding attachment with defective safety devices, or using
improperly attached or malfunctioning safety and protective equipment,
• failure to observe the instructions with regard to transportation, commissioning, operation,
maintenance and repair of the circular knife grinding attachment,
• unauthorized structural alterations to the circular knife grinding attachment,
• failure to monitor machine parts that are subject to wear, and
• use of unapproved replacement and wear parts.
Use only original replacement and wear parts. If externally purchased parts are used, it is not
guaranteed that they have been designed and manufactured to meet the requirements in terms
of stress and safety.
2.4 Safety regulations
2.4.1 Organizational measures
Inspect all available safety devices regularly.
Observe prescribed intervals for recurring maintenance work or as specified in the operating
instructions!
2.4.2 Protective equipment
Before commissioning the circular knife grinding attachment, always ensure that all protective
equipment is properly mounted and in functional condition.
Protective equipment may be removed only after the circular knife grinding attachment has
stopped and has been secured against accidental restart.
When delivering spare parts, the protective equipment must be attached by the operator as
stipulated.
2.4.3 Informal safety measures
The operating instructions must be permanently available at the place of use of the circular knife
grinding attachment. In addition to the operating instructions, the generally applicable as well as
locally relevant accident prevention regulations must also be made available and observed.
All safety and hazard warnings on the circular knife grinding attachment must be complete and
clearly legible.
2.4.4 Selection and qualification of personnel
Only trained and instructed personnel may work on the circular knife grinding attachment.
Observe the legally permitted minimum age!
2. Safety

12
The responsibilities of personnel with respect to commissioning, operation, maintenance, and
repair must be clearly specified.
Personnel still undergoing training or instruction may only work on the circular knife grinding
attachment under the permanent supervision of an experienced person!
2.4.5 Machine control system
Only trained and instructed personnel are allowed to turn on and operate the machine.
2.4.6 Safety measures in normal operation
Do not operate the machine in any unsafe manner. Only operate the circular knife grinding
attachment if all safety devices are installed and fully functional.
At least once per shift (or per day), check the circular knife grinding attachment for externally
visible damage and proper functioning of the safety devices.
Immediately report any changes present (including those of the operating behavior) to the
responsible office or person. If necessary, immediately shut down the circular knife grinding
attachment and secure it against restart.
Before you switch on the grinding machine, ensure that no one can be injured by the start-up
of the machine.
In the event of a malfunction, immediately stop the grinding machine and secure it against re-
start. Rectify malfunctions immediately.
2.4.7 Hazards due to electrical power sources
Work on electrical systems or operating materials may only be performed by a qualified
electrician, in accordance with electrical regulations.
Defects, such as damaged cables, cable connections, etc. must be immediately rectified by an
authorized specialist.
2.4.8 Particular hazard areas
In the area of the grinding wheel, wet-grinding belt and finned brushes, there is a hazard of
pinching and being drawn in, e.g. clothing, fingers and hair. Wear suitable personal protective
equipment.
2.4.9 Servicing (maintenance, repair) and fault rectification
Maintenance work is to be carried out on schedule by trained personnel. Inform operating
personnel before beginning repair work. Designate a supervisor responsible for this.
2. Safety

13
For all service work, the grinding machine is to be disconnected from the current supply and
secured against accidental restart.
Remove power plug. Secure repair area as necessary.
After completing maintenance work and rectifying any faults, install all safety devices and verify
that they are fully functional.
2.4.10 Structural alterations to the circular knife grinding attachment
Modifications, retrofitting or rebuilds of the circular knife grinding attachment are not allowed
without the permission of the manufacturer. This also applies for installation and configuration of
the safety devices.
Any conversion work requires the written permission from KNECHT Maschinenbau GmbH.
Immediately replace machine parts that are not in perfect condition.
Use only original replacement and wear parts. If externally purchased parts are used, it is not
guaranteed that they have been designed and manufactured to meet the requirements in terms
of stress and safety.
2.4.11 Cleaning the circular knife grinding attachment
Properly handle any cleaning agents and materials used and dispose of them in an environmentally
friendly manner.
Dispose of the wear parts and replacement parts in a safe and environment friendly manner.
2.4.12 Lubricants/oils and greases
When using oils and greases, follow the safety regulations applicable to the product. Comply with
the special regulations for the food areas.
2.4.13 Relocation of the grinding machine with circular knife grinding attachment
Disconnect the grinding machine with the circular knife grinding attachment from any external
power supply, even in the event of a minor change of location. Before restarting the grinding
machine, connect it properly to the power supply.
For loading work, use only lifting equipment and load-bearing devices with sufficient lifting ca-
pacity. Appoint a qualified instructor for the lifting operation.
No persons other than those designated for this work may be present in the loading and installa-
tion area.
Use only a suitable transport vehicle with sufficient carrying capacity. Secure loads safely. See also
chapter 4 of the operating instructions for the S 20 Universal Wet-Sharpening Machine. When
restarting the machine, proceed only in accordance with the operating instructions.
2. Safety

approx. 250 mm
approx. 340 mm
approx. 270 mm
approx. 340 mm
approx. 250 mm
approx. 340 mm
approx. 270 mm
approx. 340 mm
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3. Description
3.1 Intended use
The Circular knife grinding attachments HV 25-1 and HV 25-2 are used to grind circular knives.
The devices are used on the KNECHT grinding machines of the S 20 model series.
3.2 Technical specifications
3.2.1 Circular knife grinding attachment HV 25-1
Height �������������������������������������������������������������� approx. 250 mm
Width ��������������������������������������������������������������� approx. 270 mm
Depth ��������������������������������������������������������������� approx. 340 mm
Weight ��������������������������������������������������������������� approx. 2,5 kg
Grinding range ������������������������������������������� circular knives d. 80–250 mm
Figure 3-1 Dimensions in mm (HV 25-1 side view / top view)

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3. Description
3.2.2 Circular knife grinding attachment HV 25-2
Height ������������������������������������������������������������������ ca. 370 mm
Width ������������������������������������������������������������������� ca. 550 mm
Depth ������������������������������������������������������������������� ca. 500 mm
Weight ��������������������������������������������������������������������� ca. 6 kg
Grinding range ������������������������������������������ circular knives d. 250–470 mm
3.3 Functional description
For grinding circular knives (d. 80–250 mm), the Circular knife grinding attachment HV 25-1 is
mounted on the S 20 grinding machine.
For grinding circular knives (d. 250–470 mm), the Circular knife grinding attachment HV 25-2 is
mounted on the S 20 grinding machine.
The circular knife grinding attachments enable angle-precise grinding with simple operation and
very little effort. Circular knives with chipping on the cutting edge can be easily repaired here.
Figure 3-2 Dimensions in mm (HV 25-2 front view / top view)
approx. 370 mm
approx. 550 mm
approx. 500 mm
approx. 550 mm
approx. 370 mm
approx. 550 mm
approx. 500 mm
approx. 550 mm

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3. Description
3.4 Assembly description
3.4.1 Circular knife grinding attachment HV 25-1 for circular knives d. 80–250 mm
1 Hand wheel for angle adjustment
2 Grinding lever
3 Locking pin
4 Circular knife d. 90 mm
5 Grinding wheel with guard
Figure 3-3 Circular knife grinding attachment HV 25-1
2
3
1
5
4

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3. Description
3.4.2 Circular knife grinding attachment HV 25-2 for circular knives d. 250– 470 mm
1 Hand wheel for angle adjustment
2 Circular knife d. 430 mm
3 Knife guard
4 Grinding lever SH 104
5 Deburring device
Figure 3-4 Circular knife grinding attachment HV 25-2
5
4
1
3
2

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4.1 Transport aids
To transport the circular knife grinding attachment, use only adequately dimensioned transport aids.
4.2 Transport damage
If damage is detected after unloading, during acceptance of the delivery, immediately inform
KNECHT Maschinenbau GmbH and the forwarding agent. If necessary, an independent expert
must be called in immediately.
Remove packaging and fastening straps. Dispose of packaging in an environmentally friendly
manner.
4.3 Transport to another installation site
For transport to another installation site, ensure that the space requirements are fulfilled (see
operating instructions S 20 | S 20 B, chapter 3.2.2).
The circular knife grinding attachment must be secured properly during transport.
4. Transport
When transporting, observe the local applicable safety and accident
prevention regulations.
CAUTION

19
5.1 Selection of qualified personnel
We recommend having installation work on the circular knife grinding
attachment carried out by trained KNECHT personnel.
We are not liable for any damage resulting from improper installation.
CAUTION
5.2 Installation site
When determining the installation site, bear in mind the space required for installation as well as
maintenance and repair work on the circular knife grinding attachment (see operating instructions
S 20 | S 20 B chapter 3.2.2).
5.3 Settings
KNECHT Maschinenbau GmbH will configure the various components before delivery.
ATTENTION Unauthorized changes to the preset values
are not permitted and can damage the circu-
lar knife grinding attachment and grinding
machine.
5.4 Initial start-up of the circular knife grinding attachment
Completely install and inspect the protective equipment before commissioning.
The circular knife grinding attachment is only suitable for attachment to KNECHT grinding
machines of the S 20 model series.
Have all protective equipment checked for proper functioning by
authorized trained personnel before commissioning the machine.
CAUTION
5. Installation

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6.1 Mounting the Circular knife grinding attachment HV 25-1 |
HV 25-2
Engage the locking bolt (6-1/1).
The grinding arm is now locked against swiveling.
Using a 4 mm hexagon screwdriver, loosen the
two M8 set screws (6-2/1) counterclockwise.
6. Commissioning
All work must be performed by authorized trained personnel.
Observe the locally applicable safety and accident prevention regulations.
There is a risk that hands, hair, and clothing may be pulled in while the
grinding machine is switched on.
Serious injury may result. Wear personal protective equipment.
CAUTION
Figure 6-1 Engaging the locking bolt
Figure 6-2 Loosening the set screws
1
1

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Pull the standard mounting head (6-3/1) off the
side of the grinding arm.
Push the circular knife grinding attachment
HV 25-1 | HV 25-2 (6-4/1) completely onto the
grinding arm from the right.
Using a 4 mm hexagon screwdriver, tighten the
two M8 set screws (6-5/1) in a clockwise direc-
tion.
The circular knife grinding attachment is now
firmly connected to the grinding arm.
Figure 6-3 Removing the mounting head
Figure 6-4 Mounting the circular knife grinding
attachment
Figure 6-5 Tightening the circular knife grinding
attachment
1
1
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6. Commissioning