These operating instructions for the jaw crusher type BB 51 provide all
the necessary information on the topics listed in the table of contents.
The guide the target group(s) defined for the relevant subjects in safe
and proper handling of the BB 51. Knowledge of the relevant chapters by the appropriate target group(s) is essential for safe and proper
handling.
This technical documentation comprises a reference work and a training guide. The individual chapters are self-contained units.
These operating instructions do not contain any instructions on repairs. Should any repairs become necessary, please contact your supplier or Retsch GmbH.
Target group: All persons dealing with the machine in any way
The BB 51 is a modern, powerful product from Retsch GmbH. It reflects the state of the art. When the machine is handled correctly by
persons familiar with this technical documentation, it is completely
safe and reliable in operation.
Notes on safety
You, as the operator, are responsible for ensuring that the persons appointed to work with the BB 51:
• have read and understood all the stipulations of the chapter
on safety,
• are familiar before commencing work with all instructions
and regulations for the relevant target group,
• have access to the technical documentation for this machine
at all times and without difficulty.
Ensure that new staff have been familiarised with the rules for safe and
proper handling before commencing work on BB 51 either by oral instruction by a competent person and/or by this documentation.
Incorrect operation can lead to damage or injury. You are responsible
for your own safety and that of your staff.
Ensure that no unauthorised persons have access to the BB 51.
For your own protection, have your staff confirm that they have been
instructed in operation of the BB 51. A draft of an appropriate form
can be found at the end of the chapter on safety.
No liability in any form will be accepted for damage or injury resulting
from failure to observe the following notes on safety
These operating instructions do not contain any instructions on repairs. For your own safety, only have repairs performed by Retsch
GmbH or an authorised agent (service technicians).
In such a case, please inform:
The Retsch agency in your country
Your supplier
Retsch GmbH direct
Your service address:
_____________________________
_____________________________
_____________________________
_____________________________
Confirmation
I have read and understood the foreword and the chapter on safety.
The BB 51 is suitable for crushing of medium to extremely hard substances and brittle and hard/tough materials. The achievable final output fineness can be up to 0.5 mm and less, depending on the input material.
The maximum input grain size is 35 mm.
The materials which can be crushed in the BB 51 include the following:
Bakelite // bauxite // concrete // dolomite // ores // feldspar //
granite // graywacke // glass // limestone // gravel // coal // coke
// corundum // quartz // salts // refractory clay // slag // silicates
// silicon // sintered materials // cement clinker, etc.
This machine is not designed as a production machine but as a laboratory machine intended for 8 hour single shifts with 30% total operation time.
Should you require any further details, the Retsch applications laboratory will be pleased to assist.
Do not modify the machine in any way, and use only spare parts and
accessories approved by Retsch.
The conformity with European Directives declared by Retsch
will otherwise be invalidated.
Furthermore, this will lead to all warranty claims being rendered null and void.
Description of function
Comminution in the BB 51 is effected by means of pressure.
The crusher chamber 1 is funnel shaped and tapers down towards
the output end in accordance with the gap width which is infinitely
adjustable in steps of 0.1 mm.
The BB 51 has a gap width adjustment mechanism 5 linked to a fixed
crusher arm 4 and a moving crusher arm 3. Both crusher arms are
fitted with replaceable jaws 2 between which comminution takes
place by means of pressure.
The eccentric motion ( eccentricity=2.4mm / 960min
1028min
-1
at 60Hz ) of the moving crusher arm 3 steadily moves the
input material until it is fine enough to pass through the set gap
width and fall into a withdrawable receptacle 6.
The convex form of the replaceable jaws 2, which may be made of
various different materials accelerates the process of comminution
while preventing compaction and formation of bridges.
The crusher chamber of the BB 51 is enclosed on all sides by a robust
steel plate casing.
The BB 51 can be safely started up even when the hopper lid is open
and the output receptacle withdrawn, as its design in compliance with
EN 294 precludes any inadvertent insertion of hands or objects.
A main switch fitted with a thermal overload relay on the back of the
machine protects against current overload.
Gap width adjustment
From 0 to approx. 10 mm by handwheel in 0.1 mm steps. Digital gap
width indicator.
Throughput, output fineness
The performance data, throughput and achievable final output fineness
are dependent on the breakage behaviour and hardness of the process
material and on the gap width set. They can only be determined empirically.
Rated capacity of withdrawable receptacle
Approx. 1000 ml
Noise data :
Noise measurement to DIN 45635-031-01-KL3
The noise levels are also influenced by the properties of the input material.
Example 1:
Sound power level L
Workplace related emission level L
Service conditions :
Input material: none
Crushing members : zirconia jaws
Gap width set: 2mm
Example 2:
Sound power level L
Workplace related emission level L
Service conditions :
Input material : quartz gravel of grain size approx. 25mm
Crushing members : zirconia jaws
Gap width set: : 2mm
Output grain size: < 5 mm
= 78,3 dB(A)
WA
= 91,7 dB(A)
WA
= 68,7 dB(A)
pAeq
= 83,7 dB(A)
pAeq
IP ratings
IP20
IP00 on the side ventilation slits
Rated power
1100 W
Dimensions
Height: approx. 510mm, Width: approx. 360 mm, Depth: approx. 580 mm
Weight: approx. 79 kg / net
Required mounting surface
(462 mm x 1000 mm; no safety clearances necessary!)
The packaging is suitable for the mode of transport selected. It complies with the general packaging regulations.
Please keep the packaging for the duration of the guarantee period, as your guarantee claim will be endangered in the case of a
complaint or return of the machine in inadequate packaging.
Transport
The handles M available as accessories (Order No. 32.825.0001)
can be used to lift and carry the BB 51. Fig.1
The BB 51 must not be thrown, subjected to impact or shock
during transport. The electrical and mechanical components may
otherwise be damaged
Temperature fluctuations
When there are severe temperature fluctuations (e.g. during air
transport) the BB 51 is to be protected from condensation. The
electrical components may otherwise be damaged.
Interim storage
Also ensure that the BB 51 is stored in a dry location for interim periods.
Supply schedule
• BB 51 with built-in crusher arms and wearing plates.
• 1 mains power cable.
• 1 instruction manual.
Check the delivery for completeness, including the accessories ordered
individually.
Check the perfect function of the BB 51 (see chapter on operation).
On incomplete delivery and / or transport damage, you must notify the forwarding agent and Retsch GmbH immediately (within
24hrs). It may not be possible to take account of later complaints.
If the ambient temperature falls below or exceeds the limits
specified, the electrical and mechanical components may be damaged or the performance data changed to an unknown extent..
Humidity :
Maximum relative humidity 80% at temperatures up to 31°C,
decreasing in a straight line to 50% relative humidity at 40°C.
At higher humidity, the electrical and mechanical components
may be damaged and performance data changed to an unknown
extent.
Site altitude:
max. 2000 m above sea level
Installation
Place the BB 51 jaw crusher on an even and stable surface, eg. a laboratory bench.
Electrical connection
• Consult the type plate for the voltage and frequency of the BB
51.
• Ensure that the values are in agreement with the mains power
supply.
• Connect the BB 51 to the mains using the cable supplied.
Failure to observe the values on the type plate can result in damage to electronic or mechanical components.
The main switch B. is located on the back of the BB 51 Fig.2
• Switch the main switch B on.
The red LED above the STOP button D lights up.
The BB 51 is now ready for operation.
Set gap width to 00.0
The gap width must only be adjusted when the machine is empty.
There must be no input material in the crusher chamber or feed
hopper.
Before starting the BB51 turn the handwheel F through two revolutions anti-clockwise so that the crusher jaws are out of contact with
one another.
• Press the START button C. Fig.3
The red LED above button D goes out, the green LED above button C lights up, the indicator display E reads 00.0. The machine
starts up.
• Turn the handwheel F clockwise until you hear the sound of the
crusher arms meeting.
• Press button G.
The indicator display E reads 00.0.
Gap width and indicator now tally with one another.
• Turning the handwheel F closes the gap.
• Turning the handwheel F opens the gap.
Before adjusting or starting the BB51 you must turn the handwheel
F through two revolutions anti-clockwise.
The crusher jaws are then safely out of contact with one another, thus preventing jamming and possible damage to the
jaws of the BB51.
Adjustment should be carried out regularly so as to ensure that the
indicator display and the actual gap width tally. The greater the load
on the BB 51 and the harder and more abrasive the input material,
the more often a zero point adjustment must be carried out in order
to compensate for wear.
The reading on the indicator display will otherwise not tally
with the actual gap width.
The BB 51 must only be adjusted when the machine is empty.
Jamming will result if there is any material in the crusher chamber or
feed hopper before starting.
This may result in damage to mechanical components.
• Carry out adjustment as described in the preceding section.
• Press the START button C. Fig.4
The green LED above button C lights up, the BB 51 starts up.
• Set the desired gap width using the handwheel F.
Turn anti-clockwise to open the gap.
Turn clockwise to close the gap.
Display E indicates the gap width in mm.
The end of the crushing process is signalled by a change of noise and
the machine can be switched off.
Feeding in the input material
The feed hopper H and the crusher chamber can take input material up to
a grain size of 35 mm.
The feed hopper is not however intended for storage of process material:
its function is solely that of feeding material into the crusher chamber. It
also prevents inadvertent reaching into the crusher chamber, and stops
process material from being ejected.. Fig.5
• Check that the drawer and inserted receptacle are pushed in.
Fig.5
• Open the lid on the feed hopper H.
• Feed the material into the hopper.
• Close the lid on the hopper H.
Feed material into the hopper only when the machine is in operation.
Mechanical components may otherwise be damaged.
The maximum quantity of input material is limited by the capacity of the
withdrawable receptacle. The useful capacity of the receptacle will depend
on the properties of the input material. Remember to empty the receptacle
in good time.
Crushed material must not be allowed to back up in the crusher
chamber. Mechanical components may otherwise be damaged.
The BB 51 must only be stopped when there is no more input material
in the hopper and crushing chamber.
Mechanical components might otherwise jam and be damaged
when the machine is restarted.
• Press the STOP button D. Fig.6
The red LED above button D lights up, the green LED above button C
goes out. The machine stops.
• Press the STOP button D a second time.
The red LED stays lit, the display goes out and the machine is in
standby mode. The last gap width setting is retained and the machine is
still ready for operation.
The crushing process can be continued at any time, provided that the
BB 51 has not been switched off at the main switch on the back of the
machine and the red LED above button D is lit up.
Continuing the crushing process
• Press the START button C. Fig.6
The red LED above button D stays lit, the display indicates the last
gap width setting.
• Press the START button C a second time.
Fig.7
The crushing process continues using the last gap width setting.
Emptying the drawer
• Stop the BB 51
• Pull out the drawer K to the stop.
• Remove the inserted receptacle L and empty it.
The maximum capacity of the receptacle L for particular types of input material must be determined empirically.
When emptying the withdrawable receptacle L first ensure that the B
51 has run empty before stopping it, ie. that there is no more input
material in the crushing chamber or the feed hopper.
The crushed material will otherwise fall into the drawer recess
rather than into the receptacle.
Be sure to always empty the drawer in good time so that the top of the
heap of crushed material does not protrude into the crushing chamber.
The BB 51 is a robust benchtop machine which can predominantly be
used for preliminary pulverisation of hard or brittle materials.
The performance data, throughput and achievable final fineness are
dependent on the breakage behaviour and hardness of the process material, and on the gap width set.
This machine is not designed as a production machine but as a laboratory machine intended for 8 hour single shifts with 30% total operation time.
Do not modify the machine in any way, and use only spare parts and
accessories approved by Retsch.
The conformity with European Directives declared by Retsch
will otherwise be invalidated.
Furthermore, this will lead to all warranty claims being rendered null and void.
Input grain size
The maximum input grain size is determined by the size of the intake
opening, and is max. 35 mm on the BB 51.
Quality of process material
In principle, any hard and brittle process material with a Mohs hardness >3 can be crushed in the BB 51.
Moist or greasy process material with a Mohs hardness <3 tends
merely to compact or cake in the crusher chamber as a result of the
pressure applied by the crusher jaws.
Proper crushing is not possible in such cases.
From time to time the crushing chamber should be cleaned. An Allan
key AF 4 is necessary for this.
Fig.10
• Pull out the mains plug.
• Set the gap width to maximum.
• Remove the cheesehead screw S while at the same time lifting the
feed hopper from its mounting plate.
• Remove the feed hopper.
The crushing chamber is now accessible and can be cleaned using a
small brush or vacuum cleaner of the kind used on computers.
Follow the same procedure in reverse to reassemble.
Operation of the BB 51 with the feed hopper removed is not permissible.
Risk of crushing fingers and hands!
!
Cleaning the interior of the casing
Fine dust may get inside the casing through holes in the drawer recess
and this interior space should be cleaned from time to time using, for
example, a vacuum cleaner of the kind used on computers.
To do this, first dismantle the feed hopper using an Allan key AF4.
Fig.11
Fig.11
• Pull out the mains plug.
• Remove cheesehead screw S.
• Remove the feed hopper.
The interior of the casing is now accessible for cleaning.
Follow the same procedure in reverse to reassemble.
Maintenance
The BB 51 is maintenance-free and no settings need be adjusted when
the machine is used for its designated purpose.
This documentation may only be duplicated or passed on to third parties, its contents passed on or otherwise used with the express approval
of Retsch GmbH.
Contraventions will give rise to liability for damages.
Modifications
We reserve the right to make technical modifications without notice.
Safety regulations (table) for the BB 51 with reference to the individual chapters
Subject Action Hazard
Modifications to the machine
Safety
Packing
Transport
Temperature fluctuations
Scope of supply
Ambient temperature
Humidity
Electrical connection
Operation
Gap width adjustment
Feeding in the input material
Interrupting the crushing process
Emptying the drawer
Cleaning
Cleaning the crushing chamber
Replacing crusher jaws
Do not modify the machine in any way, and use only
spare parts and accessories approved by Retsch.
The conformity with European Directives declared by Retsch will otherwise be invalidated.
Failure to observe the notes on safety can lead to damage to property and personal injury.
Please keep the packing for the duration of the guarantee period.
The BB 51 must not be thrown or otherwise subjected
to impact or vibration during transport.
When there is a likelihood of temperature fluctuations
the BB 51 must be protected against condensation.
In cases of incomplete delivery and/or transport damage, you must notify the forwarding agent and Retsch
GmbH without delay (within 24 hours).
Not below 5°C.
Not above 40°C.
Maximum relative humidity 80% at temperatures up to
31°C or 50% (decreasing in a straight line) at 40°C.
Mains power differs from the values on the type plate. Electrical components may be damaged.
When starting, stopping or interrupting the operation
of the machine, ensure that the crushing chamber and
feed hopper are empty..
Adjustment should be carried out regularly so as to ensure that the indicator display and the actual gap width
tally. The greater the load on the BB 51 and the harder
and more abrasive the input material, the more often a
zero point adjustment must be carried out in order to
compensate for wear.
The BB 51 must only be adjusted when the machine is
empty.
Feed material into the hopper only when the machine
is in operation..
The maximum quantity of input material is limited by
the capacity of the withdrawable receptacle. The useful
capacity of the receptacle will depend on the properties
of the input material. Remember to empty the receptacle in good time.
The BB 51 must only be stopped when there is no
more input material in the hopper and crushing chamber.
When emptying the withdrawable receptacle L first
ensure that the B 51 has run empty before stopping it,
ie. that there is no more input material in the crushing
chamber or the feed hopper.
Be sure to always empty the drawer in good time so
that the top of the heap of crushed material does not
protrude into the crushing chamber..
Do not clean the BB 51 under running water.
Using solvents is prohibited.
Operation of the BB 51 with the feed hopper removed
is not permissible.
Operation of the BB 51 with the feed hopper removed
is not permissible.
This will lead to all warranty claims being rendered
null and void..
We accept no liability whatsoever for any damage or injury resulting from non-observance of the notes on
safety.
Return of goods in inadequate packing may jeopardise
your entitlements under the guarantee.
Electrical and mechanical components may be damaged.
Electrical components may be damaged.
It may not be possible to accept subsequent complaints.
Electrical and mechanical components may be damaged
and performance data change to an unknown extent.
Electrical and mechanical components may be damaged
and performance data change to an unknown extent.
Mechanical components may be damaged by blockage..
The reading on the indicator display will otherwise
not tally with the actual gap width
Mechanical components may be damaged by blockage.
Mechanical components may be damaged.
Crushed material must not be allowed to back up in
the crusher chamber. Mechanical components may
otherwise be damaged.
Mechanical components might otherwise jam and
be damaged when the machine is restarted.
The crushed material will otherwise fall into the
drawer recess rather than into the receptacle.
1. In the case of justified complaints, we will repair or replace the defective parts at no charge.
The purchaser shall only be entitled to withdraw from the contract or reduce the purchase price
when, at our decision, repair is impractical or impossi ble or replacements cannot be supplied or
cannot be supplied in due time, or when a reasonable period of grace of at least six weeks set
by the customer has expired without result due to circumstances within our control.
Should the attempt to repair or replace defective parts finally fail, the customer may at his op-
tion require a reduction of the purchase price or withdraw from the contract. Further claims, in
particular such for damages not suffered by the object itself, such as loss of production, shall be
excluded unless caused by intent or negligence on our part. We pass on the liability of the
manufacturer(s) for bought-in products.
2. We shall bear the direct costs of repair or replacement on condition that the complaint has
proven to be justified. This also applies to the costs of shipment and reasonable costs for dismantling and installation. The customer shall however be obliged to bear the costs of providing
his own fitters and ancillary personnel at site. Should our customer operate abroad, we shall, alternatively, be entitled to bear the costs of rectification, and in particul ar transport, travel and
material costs, ex-German border.
3. The warranty term for newly manufactured goods is two years, for used it is one year.
The guarantee refers to deployment in a laboratory in 1-shift operation. In case of multi-shift
operation or other areas of application, the guarantee term is shortened accordingly.
No warranty is given for parts subject to wear and tear.
4. We warrant that our goods are free of manufacturing defects. The suitability, classification and
function of our goods shall be exclusively determined by the specifications in the acknowledgement of order, even if these deviate from the order. In such cases, the customer shall have the
option of drawing our attention to any deviations from the order within two weeks of receipt of
our acknowledgement, and reaching agreement with us. Should no objection be raised to the
specifications in the acknowledgement of order, these shall be deemed accepted.
In the absence of any agreement to the contrary, we shall accept no liability for the suitability of
the object supplied for the purpose intended by the customer. The same shall apply to performance data expected by the customer, unless we have been able to perform appropriate, realistic
laboratory trials in advance and declared the corresponding performance data to be firm and
binding in writing in our acknowledgement of order.
5. Our warranty shall also become null and void if persons other than those appointed by ourselves
perform repairs or other work on or modifications to goods we have suppli ed or use unsuitable
accessories, provided that their is a causal rel ationship between such actions and the defects
which appear. For the rest, our warranty is dependent on compliance with our operating instructions.
6. If the goods are installed in other systems or production facilities by the customer without our
prior approval, or connected to, linked with or processed on such systems or production facilities, our warranty is exclusively limited to the parts we have supplied.
7. Repair or replacement of defective parts shall be effected at our option either at the poi nt of installation of the object purchased, or at our corporate location. When repairs take place at the
point of installation, the customer is to afford our representative unimpeded access for as long
as required to the object purchased. The customer may for the rest only require the performance of the warranty work during normal local business hours. Shoul d warranty work be performed at the customer’s request outside our normal business hours, the customer is to pay the
additional costs. Should he require further special work over and above the warranty work,
these costs are also to be borne on the basis of our current prices.