Screens feeders-maintenace sandvik
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Sandvik Mining and Construction
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Sandvik Mining and Construction
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Terms
1. Screen body2. Screen cloths / screening
media3. Drive motor / unit4. Mechanism5. Spring support6. Dust encapsulation (option,
not shown in photo)
1
2
43
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Spring support pedestals
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Widht of the screen in metres 1,0 1,2 1,5 1,8 2,1 2,4 2,7 3 ,0
Center distance of spring support pedestals in mm
1400 1600 1900 2200 2500 2800 3100 3400
1°height difference in mm 24 28 33 38 44 49 54 59
2°height difference in mm 49 56 66 77 87 98 108 119
3°height difference in mm 73 84 99 115 131 147 162 170
� Table below shows what 1, 2 and 3 degrees inaccuracy in spring pedestal on one side of the screen means in mm to screen’s level.
1°
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~ÅÅÉäÉê~íáçå=EdJÑçêÅÉF=çÑ=íÜÉ=ëÅêÉÉå=áë=åçí=ÉñÅÉÉÇÉÇKStroke Stroke length
frequency Linear stroke screens (like LF) Circular s troke screens (like SC, CS,…)(stroke in centre of the screen)
920 rpm 9.5 mm 8 mm
820 rpm 12.0 mm 10 mm
730 rpm 15.0 mm 13 mm
� Remember that increased stroke length shortens the bearing life time!
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`áêÅìä~ê=ëíêçâÉ=ëÅêÉÉåë PKQ=Ó PKT=d
iáåÉ~ê=ëíêçâÉ=ëÅêÉÉåë QKR=Ó RKM=d
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− ^äï~óë=^ph=colj=c^`qlovI=fc=kbba=ql=`e^kdb=olq^qflk=pmbbaW=tolkd=pmbba=�p`obbk=`^k=ork=kb^o=lc=k^qro^i=cobnrbk`v=� p`obbk=_lav=c^firob
2
3
4
5
6
7
8
500 600 700 800 900 1000 1100 1200 1300
3
5
7
9111315171921
G-f
orce
rotation speed (rpm)
Stroke length (mm)
Sandvik Mining and Construction
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Shape of SC / CS / XS – screens stroke(screens, where the mechanism is close to gravity point of the unit)
� Stroke is circular
Shape of MSO-screens stroke
� Stroke is elliptical in end of the screen, circular in the middle
� Stroke angle is hard to determinate.
� In G-force calculations the stroke in the middle should be used
Sandvik Mining and Construction
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Shape of LF-screens and feeders stroke
two shafts
� Stroke is mainly linear (just a bit elliptic)
� Stroke angle is about 60 degrees.
Sandvik Mining and Construction
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SANDVIK
Sandvik Mining and Construction
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SANDVIK
Example:
Linear stroke screens Circular stroke screens
Stroke length Stroke angle Stroke length
12 mm 55 degrees 12 mm
sáÄê~íáåÖ=pÅêÉÉå=píêçâÉ=äÉåÖÜí=~åÇ=ëíêçâÉ=~åÖäÉ
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Bearing size
Bearing house Shaft
Diameter Tolerance Diameter Tolerance
B16 170P6-0,036
-0,06180g6
-0,010
-0,029
B20 215P6-0,041
-0,070100g6
-0,012
-0,034
B24 260P6-0,047
-0,079120g6
-0,012
-0,034
B30 320P6-0,051
-0,087150g6
-0,014
-0,039
B34 360P6-0,051
-0,087170f6
-0,043
-0,068
B38
with
bushing
460H7
Bearing house
+0,063
+0,000
190f6-0,050
-0,079
460k7
(Bushing outside Ø)
+0,068
+0,005
400P6
(Bushing inside Ø)
-0,051
-0,087
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PARALLEL MISALIGNMENT PARALLEL MISALIGNMENT
Sandvik Mining and Construction
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Centre Distance Allowance For Installation(Flanged Pulleys Removed)
and Tensioning (mm)
Additional Centre Distance Allowance For Installation Over Flanged Pulleys
Belt Installation Allowanc
e
Tensioning Allowance (Any Drive)
Belt Pitch One Pulley Flanged
(mm)
Both Pulleys Flanged
(mm)
1000mm and under 1,8 0,8 5mm8mm14mm
122236
193358
Over 1000mm to 1780mm 2,8 0,8 LH
2532
3548
Over 1780mm to 2540mm 3,3 1,0
Over 2540mm to 3300mm 4,1 1,0
Over 3300mm 5,3 1,3
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Insert push into pulley
Insert screws and locate on shaft
Sandvik Mining and Construction
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Tighten screws alternately
Tighten screws finger tight
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To remove
Sandvik Mining and Construction
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Sandvik Mining and Construction
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Trouble Possible cause Correction
Screen does not start or it stops during operation.
1. Electrical fault.Check wiring and components and correct.
2. Too high oil viscocityChnage oil to correspond ambient temperature.
3. V-belts slipping or broken.Check condition and tension of belts.
4. Timing belt broken.Check condition and tension of belts.
Screen running incorrectly (in motion).
1.Screen contacts something during operation (base,m chute, material, ice etc.)
Arrange space for screen to run correctly.
2.V-belt/timing belt pulleys and/or V-belts/timing belts are worn.
Change new ones.
3.Drive equipment is wrongly positioned in relation to vibrating shaft.
Move and adjust according to instructions.
4. Screen base not solid enough. Support.
5. Springs broken or tiredChange springs. Screen is galloping – overloaded – add springs.
Sandvik Mining and Construction
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Trouble Possible cause Correction
Drive equipment deflects and vibrates too much.
1. Fastenings has loosed. Tighten the fastening bolts .
Screen supporting frame deflects and vibrates too much.
1.Construction is too light orinsufficient bracing.
Add support and brace.
2.Foundations of screen frame are notstrong enough.
Build up foundations.
3.Support structure critical frequencytoo close to to operating speed.
Build up foundations.
Unusual noise during operation.
1.There are loose or damaged parts in the screen.
Tighten, repair or change the part. At the same time check all screws for tightness. Check the reason for damage.
2.Screen contacts something during operation.
Arrange space for screen to run.
3. Screen meshes are loose. Tighten according to inst ructions
4. Bearing damage. See bearing damage.
5. Broken spring.Change spring after checking the cause.
Sandvik Mining and Construction
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Trouble Possible cause Correction
Unusual noise during operation (continued).
6.There are stones, dust, tools etc inside the counterweight guards.
Clean regularly.
7. There are stones between springs.Clean the spring systems regularly and prevent material from building up between the springs.
Screen bearings overheat.
1.Incorrect amount of oil in vibrating shaft.
Check oil level.
2. Wrong type or old oil in shaft. Change oil.
3. Bearing damage. See bearing damage.
4.High temperatures in the environment or material.
Arrange ventilation and change the oil suitable for high temperatures.
5. Too high speed. Lower speed.
Sandvik Mining and Construction
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Trouble Possible cause Correction
Bearing damage.
1 Normal life of bearing exceeded.
Check amount of operating hours and always replace damaged bearing with a new one. Check also possible reasons for the damage.
2. Insufficient lubrication.Check lubrication maintenance and possible oil leakages.
3. Unsuitable oil. Change oil type.
4.Foreign material (steel, sand etc.) in oil.
Check the cause (some damaged part, dirty conditions during oil change, dirty cans in handling of oil etc.)
5.Shaft is not in level position, when the other bearing is overfilled and the other underfilled with oil.
Adjust the screen to the right position according to instructions.
6. Axial loads bearing stuck on shaft.Use corrosion protection lubricant between shaft and bearing. See item 6.8
Sandvik Mining and Construction
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Trouble Possible cause Correction
Bearing damage (continued).7. Too high speed. Lower speed.
8. Too high G-force. Reduce stroke length/speed.
Oil leakage.
1. Breather is clogged. Clean or change breather regu larly.
2.Seals are worn out or damaged (for instance during assembly). Do not reuse old seals
Change the seals being careful that the new ones are not damaged during installation.
3. Wear ring is worn out.Change wear ring to a new one. It is advisable to change a new ring at the same time with shaft sealing.
4. Oil level assembly loose or leakage. Tighten it.
Sandvik Mining and Construction
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Trouble Possible cause Correction
Aperture in screen meshes is clogging or screen capacity is insufficient.
1. Stroke angle or form incorrect. Adjust according t o instructions.
2. Stroke lenght is too short.Adjust counterweights according to instructions.
3. Too low frequency.Alter V-belt ratio by changing sheave.
4.
Unsuitable meshes (for instance too thick meshes in relation to aperture, shape of opening unsuitable, too small net opening percent etc).
Install suitable mesh.
5.Material includes plenty of clay, mud or other impurities.
Wash material before screening.
6. Too high feed rate to the screen. Reduce the feed rate.
7.Incorrect rotation direction of the stroke.
Change the rotation direction.
Sandvik Mining and Construction
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Trouble Possible cause Correction
Material flows mostly on one side of the screen.
1. Incorrect feed to the screen.Re-position the feed so that it is evenly spread across the whole width of the screen.
2.Screen is not running in the right position.
Check the horizontal position of the spring pedestals.
Too much material collecting at feed end of the screen.
1. Conveying rate of screen too low. See corrections above.
2. Too high feed rate or uneven feed. Adjust feed rat e.
3.Material fed against the conveying direction of the screen
Arrange feed as per manual chapter 3.2.
4.Direction of the screen rotation incorrect.
Check direction of rotation and change if necessary.
5.Too heavy material load from the chute above.
Adjust feed chute to remove head load.
Sandvik Mining and Construction
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Trouble Possible cause Correction
Screen meshes wear or break in some places rapidly; unusual high wear of meshes.
1.Wrong tensioning of meshes in some places, or generally in the whole screen.
Check and retighten screen meshes according to instructions regularly.
2.Fed material falls onto the screen mesh instead of the receiving area.
Re-position feed arrangement.
3.Screen mesh unsuitable for screened material.
Change the mesh. (for instance steel wire mesh to rubber mesh).
4.High capacity of screen and highly abrasive material.
Change the mesh. (for instance steel wire mesh to rubber mesh).
Material spills from chutes onto maintenance platforms etc.
1.Feed or discharge chutes unsuitable or incorrectly installed.
Re-install and seal. It is not permitted to connect extra parts to the screen body as this can impair the operation or damage the screen.
2.
Screen worn so badly that material is leaking from feed or discharge areas or side plates. This can happen if wear plates are not changed in good time or if they are loose.
Check the condition and fixing of wear plates and change in good time according to instructions. Check also tightening of the bolts regularly.
Sandvik Mining and Construction
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Trouble Possible cause Correction
In dust sealed screens, dust escapes.
1. Leak in the dust enclosure. Seal.
2.Insufficient suction in the dust enclosure.
Increase suction of vacuum inside the enclosure.
Supporting springs of the screen tilt too much.
1.Fastening screws in the springing system loose.
Tighten and change ifnecessary.
Sandvik Mining and Construction
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