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Nordberg GP series cone crushers
Wear parts application guide
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Wear parts application guide - Nordberg GP series cone crusher
GP cone crusher and basic conceptsGP cone crusher is a compressive
crusher where f eed material is
crushed between a fixed concave
and a movable mantle. Bigger
rock particles are crushed against
the mantle and concave. This is
called single-laer crushing.
!maller rock particles are crushed
between other rock par ticles"
which is called multi-laer crush-
ing. multi-laer crushing plas a
significant role in the GP cavit.
This improves the end pr oduct
#losed side setting $#!!%
The closed side setting defines the r eduction
ratio in GP cone crusher and has significant
bearing on product gradation" capacit and
power draw.
The closed side setting is measured fr om
the bottom of the mantle to the bottom of
the concave at their closest coincidence dur-
ing the grating ccle.
Nip angle
The nip angle is the the angle between the
mantle and the concave. Too large nip angle
reduces the capacit and increases the wear
due to f eed material is bouncing upwards in
the cavit.
& eduction r atio
The reduction ratio means the reduction fac-
tor between f eed and a product. This ratio is
usuall taken from the '() point of the f eed
and product cur ve. * tpical reduction ratio
for the GP secondar crusher is +-, and" f or
the GP fine crusher " .,-+.
shape and reduces wear in wear
parts.
eed opening
The f eed opening defines the maximum f eed
si/e to the crusher . 0n GP cone" the closed
side f eed opening is measured from the top
of the concave to the top of the mantle
when the mantle is at the closed side setting
position.
The maximum f eed si/e in GP cone is the
same as closed side f eed opening. maximum
f eed si/es are also stated in cavit configura-
tion tables later in the guide.
Reduction ratio = F80 /
P80
Product F eed
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Good feed level and distribution
2ow to operate a GP cone crusher 0n order to get optimum capacit
and maximum lif etime of wear
parts" consider the f ollowing
points3
. #heck the feed arr angement3
4 The crusher should be choke f ed so that
the crushing chamber is full all the time.
This is important" especiall in fine crushing.
#hoke f eeding maximi/es the amount of
multi-laer crushing" and improves wear
shape and crushing efficienc.
Too big feed material Too small feed material
5. #heck the feed si/e and gr adation3
4 6versi/e f eed material decreases capacit
. #hoke f eed level for GP secondar
crusher is at the level of the mantle
fixing nut
5. #hoke f eed level for GP fine crusher
is max meter above the top bear ing
ar rangement
4 The f eed must be distributed evenl +7(8across the crushing chamber . 9neven f eed
distribution ma cause unbalanced crushing
f or ces and uneven wearing in the GP con-
cave.
4 eed should not be segregated $for exam-
ple finer material in other side of cavit%.
4 The flow of the f eed should be stable and
continuous. $2owever GP cone crusher can
be used in pulse f ed applications as the
head spin is minimi/ed.%
4 #irculation is needed when producing high
:ualit pr oducts.
and can cause unnecessar loads to the
crusher .
4 Too small f eed si/e for the cavit increases
wearing at the bottom part of liners and
ma cause poor utili/ation rate of wear parts.
4 ines $(-1% should be screened awa bef or e
the crusher as the ma cause pack ing. $GPsecondar is not sensitive to fines%
4 eed gradation should be stable $no gaps
in f eed%.
Note3 eed material characteristics
such as gradation" bulk densit" mois-
tur e" cla content and crushabilit
have significant impact on crusher
capacit.
e e d
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eed material characteristics 6perating par ameters
!hape of ; #.!.!. in pr oduct
#apacit increases
4 !etting increases -> Power draw decreases
1. #heck the str ok e
4 !troke increases -> #apacit increases4 !troke increases -> Power draw increases
,. #heck the cavit in use
4 Based on f eed si/e
4 Based on re:uired end product si/e which
gives re:uired setting range
4 #heck the crushing ratio.
7. #heck the wear profile of the liners3 *
distorted wear profile ma decr ease
capacit" increase wearing and incr ease
crushing f or ces
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GP fine cone crusher cavit selection
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C C
GP ineAifficultand
Aifficult and non ?edium and ?edium and non
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# D #oarse
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When to change linersHiners must be changed bef or e
the are worn through in order to
prevent damage to frame or
head. Hiners should be changed
no later than when the * dimen-
sion is (-, mm depending oncrusher model.
Production aspects ma sometimes favour
changing of wear parts before the are
full utili/ed. 2ourl capacit or product
:ualit ma decrease towards the end of
liner life- time and it ma be economical to
change the liner before the end of its
lif etime.
* distorted wear profile tpicall causes a
reduction in capacit. 6ther smptoms of
distorted wear profiles are high power and pressure and short lif etime of wear parts. *
distorted wear profile ma lead to liners
having to be replaced before the are full
worn.
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egal noticeetso reserves the right to make changes in
pecifications and other information con-
ined in this publication without prior
otice and the reader should in all cases
onsult metso to determine whether an
uch changes have been made. This manuala not be reproduced and is intended f or
he exclusive use of metso customer .
he terms and conditions governing the sale
f metso hardware products and the licens-
g and use of metso software products con-
sts solel of those set f or th in the wr itten
ontract between metso and its customer .
o statement contained in this publication"
cluding statements regarding capacit"
uitabilit for use" or per f or mance of pr od-
cts" shall be considered a warrant b
etso for an purpose or give rise to an
abilit of metso.
no event will metso be liable for an
cidental" indirect" special" or conse:uential
amages $including lost profits%" arising out
f or relating to this publication or the
infor- ation contained in it" even if metso
has
een advised" k new" or should have k nown
f the possibilit of such damages.
etso" 5(,. *ll rights r eser ved.
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