roller press operation.pps

7/24/2019 Roller Press Operation.pps

1/20

Hydraulic control ROLCOX

of the rolls1

Fixed Roller

Movable Roller

Left Right

Hydraulic oil tankPump HT 1 M 01

Next


2/20

HT 1 V 3/4 Prop. valve right

HT 1 V 1/2 Prop. valve let

HT 1 V 0! "mergency valve

HT 1 V 10Pre##ure decrea#e valve let

$ one %ay valve &

HT 1 V 11Pre##ure decrea#e valve right

$ one %ay valve &

HT 1 V 0' (etraction cylinder valve

HT 1 M 01 Hydraulic pump

HT 1 V 0) *ypa## valve right

HT 1 V 0+ *ypa## valve let

Left Right

Retraction cylinder

Fixed Roller

Retraction cylinder

Hydraulic oil tank

Movable Roller

Pre## cylinder

V 0!

V 0'

Pump HT 1 M 01

V 0)V 0+

V 10 V 11

2

Next

Next

Next

Next

Next

Next

Next

Next

Next

V 1/2 V 3/4


3/20

+ Bearing dist. = 0 mm

R ! Frame

"a# sensor Limit s$itch

ress cylinder

Fixed Bearing

% Roller dist. = 10 mm fix

"a# = 10 mm

Movable Bearing

Next

(etraction cylinder

Next

Next

Next

Next

meas&red by

,i#tance -lock


4/20

This is the point where the bearing distance is 0.

For the gap measuring this point is 4 m Amp.

The bearing blocks are fixed in a way that the

rollers can never touch each other physically

FixedRoller

Movable Roller

Left ight

!istance pieces

Movble

Roller

FixedRoller

Left ight

!istance between the bearings used as lower

limit for the pressure control.

"f distance is less pressure control will be

deactivated.

Roller distance 10mm = "a# 10 mm

Roller distance 10 mm

+ Bearing dist. 1' mm

= "a# 2' mm

"a# = 10 mm

Set points (

0 mm $ *earing di#tance & 0mm

P min Pre##ure control

normal operation

min 1 mm $ *earing di#tance &

Next

Movable Roller

Next

Next

Next

P 5 min Pre##ure control 66

Next

"a# = 2' mm


5/20

L min

Movable

Roller

FixedRollerLeft ight

"a# = %' mm

Movable

FixedRoller

Leftight

"a# = (' mm

L2arameter set in the L). *et only once.

Range from '.0 to %0.0 mm

ct&al set #oint 2' mm

, *et #oint for material feeding -


Set points

L min

+ L2 + 10 Bearing dist. %' mm

'

Next

= "a# %' mm+ L2 Bearing dist. 2' mm

Next

L2

+ 10 mmntil this val&e the rollers are #&shed bac/

d&ring start the main motors.

= "a# (' mm


Next

Next


6/20

Movable

Roller


"a# = ' mm maxim&m


+ Bearing dist. '' mm

= "a# ' mm

imit #%itchMa7imum di#tance allo%ed

-et%een the -earing#. $ + mm ap &

,etermined -y a mechanical #%itch.

ver + mm gap the roller pre## %ill

#top %ith ma7. gap alarm.

Set points

ormal o#eration

Movable

Roller

Next

Next

O!

L2

L min

8 10 mmMovable

Roller

Movable

Roller


7/20

Movble

Roller

V 0!

V 0'

#ydraulic oil tank

Pump HT 1 M 01

$ress cylinder

ter reaching o 2 8 10 mm9 the main drive# %ill -e

#tarted one -y one.

3

%tart $ group

At every start the emergency valve is energi&ed

to close the hydraulic circuit.

The movable roller will be moved

by the retraction cylinders to 2 8 10 mm : 4 mm

To release the oil of the main cylinders the bypass valves

and the pressure decrease valves are energi&ed 'opened(.

This will occur with standing rollers.

Next

V 0+V 0+ V 0)V 0)

Next

NextNext

Next

V 0!

Movable

Roller

Left

Fixed

Roller ight

"a# = (' mm

Next

Next

L min

L2

+ 10 mm

V 11

V 3/4

V 10

V 1/2

V 10

V 0+V 0+ V 0)V 0)

V 3/4V 1/2

V 0)V 0)V 0)V 0)V 0+V 0+V 0+V 0+

V 11

"alve closed

"alve open


8/20

Next

V 0'

;tart (P group

(etraction cylinder# are dra%n -ack -y #pring#.

After L) will be reached in pre bin the shut off *ate will be opened

to release material flow to the rollers.

4

Next

L) "a# = %' mm

"n case if during moving back the movable roller an oil pressure

is measured of more than 40 bar ' normal + 40 bar (, the start will

be interrupted by an alarm signal.

Fault has to be acknowledged at the roller press after checking.

$ossible causes-

aterial between the rollers.

!isturbance in the hydraulic circuit.

oller can not move free.

After bearing distance is on both sides L) the roller press group will

be released and feeding of the pre bin can be started.

Next

Next

Movble

Roller

V 0!

#ydraulic oil tank

Pump HT 1 M 01

$ress cylinder

V 0+V 0+ V 0)V 0)V 0!

Movable

Roller

Left

FixedRoller ight

"a# = (' mm

V 10

V 3/4V 1/2

V 0)V 0)V 0)V 0)V 0+V 0+V 0+V 0+

V 11

ter thi# the mova-le roller %ill -e pu#hed -ack to

2 -y the main cylinder# rom 4 mm to 3 mm.

Thi# happen# %ith running roller#.

V 0'

Next

V 0+V 0+ V 0)V 0)

V 11V 10

V 1/2 V 3/4V 1/2 V 3/4

"a# = %' mm

Pump #top# and valve# %ill -e clo#ed.


9/20

V 3/4V 1/2 V 3/4V 1/2

V 0!

V 0'

V 0)V 0+

$ress cylinder

Left ightFixedRoller

The proportional valves will increase pressure to the

main cylinders up until the set point.

#ydraulic pump start.

5

#ydraulic oil tank

Pump HT 1 M 01

Next

%tart $ressure controlAfter the start program is ready the pressure

control will start automatically.

After opening of the shut off gate there will get

material between the rollers.

Next

Movable Roller

Next

V 11V 10


10/20

$ressure control

/y the intake behaviour of the running rollers

combined with the pressure of the column ' gap (

of material on the rollers the material flow will

tend to press the rollers apart.

#ydraulic oil tank

V 3/4 12)

V 0'

Pump HT 1 M 01

V 0! V 0)V 0+

Left ight

$ress cylinder

Movable Roller

Fixed Roller

3hen the hydraulic reaches thevalue set pointtolerance

the proportional valves will be closed

and the pump will stop.

10

Pre#.;et point

At this value the material counter pressure

and the cylinder pressure will be on balance.

< 10 -ar

8 10 -ar

12) V 3/4

Next

Next

V 11V 10


11/20

cc&m&lator

"as , 2 - ress&re = 50 bar100 bar

1%' bar

12' bar

11' bar

;et point 12 -ar

#ydraulic oil tank

V 3/4 12)

V 0'

Pump HT 1 M 01

V 0! V 0)V 0+

Left ightFixedRoller

$ress cylinder

Movable Roller

50

bar

*tart

6 50 bar

$ressure control

$ressure variations with in tolerance will be

compensated by the 5) accumulators.

11

12) V 3/4

100

bar Next

12' bar

Next

V 11V 10


12/20

ote=This can happen at both sides at the same time but also

on one of both sides, depending of pressure measurement onthis side.

V 3/4 12)

10

V 0'

#ydraulic oil tank

Pump HT 1 M 01

V 0! V 0)V 0+


12

They will remain open until the set point

operation pressure 6 tolerance is reached.

After this the valves will be closed.

$ressure control

3hen the hydraulic exceeds the pressure 'value(

set point 6 tolerance the proportional valves will open and the

pressure decrease valves will be opened 'energi&ed(.

1%' bar

12' bar

11' bar

( m m#

7haracteristics of proportional valves.

1007

100

7

12 m m#

0 7

Proportion valve

pre##ure

increa#e

20 m m#

Proportion valve

pre##ure

decrea#e

;et point

%0 7

%0 7

8 m Amp

V 3/4

Next

$ress cylinder

Movable Roller

Next

Next

V 11V 11V 10


13/20

$ressure control

3hen the hydraulic gets beneath the pressure 'value(

set point 9 tolerance the proportional valves will be

opened and the pump will start.

:24 12)

08

#ydraulic oil tank

$ump #T 1 01

0; 0


14/20

A certain deviation is due to non homogenate mixture

of raw materials 'coarse, fine, wet, dry(.

*ap 'l( *ap 'r(>

:24 12)

08

#ydraulic oil tank

$ump #T 1 01

0; 0 *ap'diff(

*ap'diff( ? *ap'diff(toll.

7orrection will be done first on the side with the bigger

gap -y pre##ure increa#ing.

7orrection is permitted until operation pressure 6 @ bar.

1(

"f this value is exceeded the skewing will be corrected.

*ap correction

A deviation in gap width between left and right

in permitted until a preset value.

This will remain so until gap difference tolerance

has been reached. %et point 4 mm.

After this the valves will close again and pump will stop.

$resscilinder

Movble

Roller$resscilinder

Movble

Roller$ress cylinder

Movable Roller

12)

Next

Next

Next

11V 10


15/20

:24 12)

10 08

#ydraulic oil tank

$ump #T 1 01

0; 0


16/20

12) :24

After this correction pressure control will be reactivated.

"f pressure difference between left and right exceeds a

preset maximum ' :0 bar ( an alarm will be generated

and pressure will be released at both sides.

*ap 'diff( + *ap 'diff(toll. ' 4 mm (

08

#ydraulic oil tank

$ump #T 1 01

0; 0


17/20

7urrent control

/y means of to much adusting of operation pre##ureordue to changing material properties

the electrical loadof the main drives can become to high.

"f this load exceeds a preset maximum the pressure will

be reduced.

08

#ydraulic oil tank

$ump #T 1 01

0; 0 4@ mm gap

or until the drives get below operation load.

$ress cylinder

Movable Roller

Next

V 11V 11V 10V 10

Next


18/20

V 10V 11

$ *roup stop

The $ressure decrease valves will open,

the proportional valves will open,

and the emergency valve will open.

#ydraulic oil tank

$ump #T 1 01

Left ightFixRoller

14

$ress cylinder

Movble

Roller

FixedRoller

Movable Roller

08

0; 0


19/20

Roller #ress

8osing "ate

min. os.

o#en

9#en

the

8osing

"ate

8osing

"ate in

Movable

Roller

Fixed

Roller

15

close

R ! Bin

*lide "ate.

o#ened

max. os.

8osing

"ate

Last


20/20

20

roller press operation.pps

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