The PERMOLEX-POLAR Centrifuge


The continously operating centrifuge for the recovery of coolants when swarf and grinding sludge are processed


SEVEN ADVANTAGES IN ONE MACHINE

  • Suitable for swarf of all common metall classes and grinding sludge
     
  • Very low residual moisture achievable
     
  • High wear resistance due to manganese lining
     
  • Continuous and fully automatic operation
     
  • Low maintenance and service cost
     
  • Very high operational reliability
     
  • Short payback period
     


PERMOLEX-POLAR K41
with conveyor and collection tank


THE COMPACT PERMOLEX-POLAR CENTRIFUGE K40K

The small, continuously operating swarf centrifuge for short, pourable swarf up to 20 mm
  • Compact construction
     
  • Low maintenance and service cost
     
  • Little residual moisture after drying of swarf
Dimensions
Height: 1400mm, space required: 1120mm x 1300mm, swarf discharge: ø700mm

PERMOLEX-POLAR K40K

Facility Example:

A Permolex-Polar K40K which is charged by a scraper conveyor discharges the dry swarf in swarf trolleys provided by customer.

PERMOLEX-POLAR K40K


THE PERFORMANCE OF THE PERMOLEX-POLAR CENTRIFUGES

K41 - K101:
The metal swarf mixed with coolants or grinding sludge are conveyed by means of a suitable controllable conveying device such as hinge conveyors, scraper conveyors or screw conveyors. The metering screw (optional for K41 – K101) in the charging hopper of the centrifuge has the task to feed the materials evenly into the drum. According to the kind of swarf, coolant and continuity of the swarf flow to the centrifuge the use of the metering screw can be dispensed with. For swarf tending to get stuck or to stick (e. g. aluminium) the use of the metering device is basically recommended.

Due to the particular drum design and the effect of the centrifugal force swarf is spun against the inner wall of the centrifugal drum and is then slowly pushed upward within the drum by succeeding swarf. The throughput capacity of the centrifuge and thus the dwell time of the swarf in the drum are determined by controlling the conveying speed of the conveyor.

At the largest drum diameter the coolant passes out of the drum through an exchangeable bar screen into the spinning off area.

The dried swarf is pushed over the upper drum rim. Outside it is spun against an exchangeable manganese rebounding ring. Swarf and coolant are separately led out of the centrifuge.

Through a discharge tube the spun-off coolant gets sideways out of the machine. The dried swarf falls downward out of the centrifuge onto a suitable conveying device placed behind or directly into a container placed below.

There has to be a continuous flow of liquid within the flushing device to prevent superfine swarf which is discharged with the coolant to deposit in the spinning off area. Coolant can be added from a container placed behind or e. g. directly from a central coolant supply facility.

Permolex-Polar centrifuges can optionally be equipped with hot-air heating which heats the centrifuge and thus leads to a reduction of the viscosity of the used coolant.

Depending on the kind of swarf and coolant the attainable value of residual moisture can be improved.


K40K:
The centrifuge can be directly charged by the discharge conveyor of your processing machine. If necessary the transfer chute has to be slightly adapted. Through the charging hopper swarf is fed into the lower part of the drum.

Due to the drum design and to the centrifugal force swarf is pushed upward along the inner drum wall. At the same time they pass the bar screen where the adhering coolant is spun-off.

Finally swarf is pushed over the upper drum rim and spun outside against the rebounding ring. There they fall down out of the machine alternatively into a container or a transport conveyor.
 


PERMOLEX-POLAR K51
with metering screw
cross-sectional representation
 



PERMOLEX-POLAR K40K
cross-sectional representation
 


THE CONSTRUCTION OF THE PERMOLEX-POLAR CENTRIFUGES
K41 - K101:
The centrifuge is mounted on a solid step bearing. This bearing contains the elastically mounted carrier of the centrifugal motor which is directly connected with the drum. Due to this construction the drum can stabilize itself in case of unbalance. As soon as unbalances occur which cannot be adjusted an unbalance switch stops the centrifuge.

The inner baffle ring as well as the centrifugal case are equipped with manganese steel or they are completely made of manganese steel. Thus wear due to swarf impinging with high speed is considerably reduced.

Swarf is discharged directly downward out of the centrifuge. The very simple construction of the centrifuge is hardly susceptible to failure; thus maintenance and service costs are very low.


K40K:
The Permolex-Polar K40K is mounted in elastic rubber springs within a stable case. The overhead mounting plate carries the case as well as the motor with the centrifugal drum.

The motor is arranged in the center of the drum thus keeping the height of the machine low.

The baffle ring is made of wear-resistant manganese sheet steel.
 


OPTIONAL EQUIPMENT FOR THE PERMOLEX-POLAR CENTRIFUGES K41 - K101

The electromagnetic lid locking only permits the opening of the maintenance lid after the centrifugal drum has come to a standstill. The standstill is monitored by an initiator. In case of drum standstill the notice “possible to open lid” is shown on the operator’s board. By means of a press button the electromagnetic locking is released; and the lid can be opened. In the standard design the maintenance lid is fastly bolted to the centrifugal case.
  		Lid locking

The metering screw in the charging hopper of the centrifuge evenly charges the swarf in the center of the drum and prevents that the hopper opening is clogged by swarf that has got stuck.

In the case of blocking the screw changes its sense of rotation and thus tries to eliminate the blocking. The screw can be supplied with a clockwise or counter-clockwise sense of rotation depending on how swarf is put into the charging hopper.

When the hopper opening of the conveyor is mounted the grate covering in the area of the feeding hopper (see picture flushing-in device) has to be cut out accordingly. The covering serves as protection against interference within the area of the metering screw.
  		Metering screw

The flushing-in device is used for swarf tending to stick in the feeding hopper. The nozzle is connected with the coolant connection of the flushing-out device. A fine coolant flow is guided through this nozzle to the feeding hopper, which flushes adhering swarf into the centrifugal drum. In the case of cast iron swarf the flushing-in device is principally used due to the behavior of the cast iron swarf, which tends to stick strongly.
  		Flushing-in device

By using a heater the internal area of the centrifuge and thus the passing swarf and coolant are heated by blowing hot air into the area. The viscosity of the coolant is reduced. The coolant can be separated from the swarf surface more easily and in many cases the attainable value of the residual moisture can be considerably reduced. The heater can be supplied with different performance levels. The heater is alternatively controlled via a three-stage switch, thermostat or PT 100.
  		Heater


THE PERMOLEX-POLAR CENTRIFUGES IN USE
PERMOLEX-POLAR K41 and HYDRO-POLAR ZST 7 to dry swarf and grinding sludge from a filtering device.
Feeding via screw conveyor


THE BROCHURES OF THE PERMOLEX-POLAR CENTRIFUGES FOR DOWNLOAD
The PERMOLEX-POLAR brochure comprises eight pages (DIN A4) and can be downloaded as zipped ADOBE PDF file in the folowing languages:
German:
PERMOLEX-POLAR - Brochure as ADOBE PDF file (zipped)
544  kByte
permolexpolar_de.pdf
Englisch:
PERMOLEX-POLAR - Brochure as ADOBE PDF file (zipped)
518 kByte
permolexpolar_en.pdf
French:
PERMOLEX-POLAR - Brochure as ADOBE PDF file (zipped)
1.835 kByte
permolexpolar_fr.pdf
Spanish:
PERMOLEX-POLAR - Brochure as ADOBE PDF file (zipped)
522  kByte
permolexpolar_sp.pdf
Italian:
PERMOLEX-POLAR - Brochure as ADOBE PDF file (zipped)
518 kByte
permolexpolar_it.pdf
Czech:
PERMOLEX-POLAR - Brochure as ADOBE PDF file (zipped)
519 kByte
permolexpolar_cz.pdf
Polish:
PERMOLEX-POLAR - Brochure as ADOBE PDF file (zipped)
523  kByte
permolexpolar_pl.pdf
To unzip the file a special program such as e. g. WinZIP is required.The PDF file in the ZIP file can be displayed and printed with the ADOBE ACROBAT reader.


TECHNICAL DATA OF THE PERMOLEX-POLAR CENTRIFUGES
    K40K K41 K51
Throughput capacity Steel
Grey cast iron
Brass
Aluminium
Grinding sludge 		up to 0,5 m³/h
up to 0,4 m³/h
up to 0,4 m³/h
up to 0,5 m³/h
not suitable 		up to 0,5 m³/h
up to 0,4 m³/h
up to 0,4 m³/h
up to 0,5 m³/h
up to 0,2 m³/h 		0,5-1,7 m³/h
0,5-1,7 m³/h
0,5-1,7 m³/h
0,5-1,7 m³/h
0,2-0,6 m³/h
Drum Diameter
Height
Rotational speed ² 		400 mm
303 mm
1.480 rpm 		400 mm
303 mm
1.400 rpm 		500 mm
386 mm
980/1.400 rpm
Motor Power approx.
Voltage ³ 		3 kW
400 V / 50 Hz 		6,5 kW
400 V / 50 Hz 		6,5 kW
400 V / 50 Hz
    K61 K81 K101
Throughput capacity Steel
Grey cast iron
Brass
Aluminium
Grinding sludge ¹ 		1,7-3,4 m³/h
1,7-3,4 m³/h
1,7-3,4 m³/h
1,7-3,4 m³/h
0,6-1,2 m³/h 		3,4-6 m³/h
3,4-6 m³/h
3,4-6 m³/h
3,4-6 m³/h
1,2-2 m³/h 		6-10 m³/h
6-10 m³/h
6-10 m³/h
6-10 m³/h
2-3,5 m³/h
Drum Diameter
Height
Rotational speed ² 		600 mm
400 mm
980/1.400 rpm 		800 mm
430 mm
735/980 rpm 		1.000 mm
600 mm
735/980 rpm
Motor Power approx.
Voltage ³ 		7,5 kW
400 V / 50 Hz 		7,5 kW
400 V / 50 Hz 		15 kW
400 V / 50 Hz
Standard values for
apparent weight of
swarf 		Steel
0,5-1,0 kg/ltr. 		Grey cast iron
0,8-1,5 kg/ltr. 		Brass
0,5-1,5 kg/ltr. 		Aluminium
0,1-0,7 kg/ltr.
Standard values for
apparent weight of
grinding sludge 		0,5-1,5 kg/ltr.
¹ Only after previous expert opinion of a grinding sludge sample.
² At 50 Hz standard frequency, other speeds possible upon request. The second rotational speed is at disposal upon request depending on application.
³ Other voltage / standard frequency possible upon request.


THE PERMOLEX-POLAR DRUM


Standard design


INSIGHT INTO THE PERMOLEX-POLAR


A photomontage of the interior view of a PERMOLEX-POLAR CENTRIFUGE.

Here the motor drum arrangement in the centrifugal casing is clearly seen.


THE PERMOLEX-POLAR CENTRIFUGE IN A DE-OILING FACILITY


Swarf is discharged via a hoist-tipping device into a swarf crusher type RS300E. After they were crushed by the crusher a scraper conveyor conveys short swarf into the PERMOLEX-POLAR Centrifuge K51 . The dried swarf is discharged into provided containers via a scraper conveyor with swivelling chute.


PRACTICAL EXAMPLE OF THE PERMOLEX-POLAR CENTRIFUGES

Problem:
In a well-known automotive factory various quantities of swarf is produced in different operational processes.
Representatively for a variety of applications we want to present two solutions here:

Solution 1:
Swarf with much emulsion adhering to it comes from the separator of a filtering device and is transported with a scraper conveyor to a PERMOLEX-POLAR centrifuge type K51. The machine is designed in a way that the extra emergence of swarf at the end of a shift can be processed without an increase of the desired value of residual moisture.
Solution 2:
Emulsion-coated swarf which is produced in two transfer lines is conveyed to a PERMOLEX-POLAR centrifuge type K8 after being processed in a swarf crusher.
After the swarf has been freed from the coolant it is conveyed to an overhead hopper by interlinked scraper conveyors.

Extensions:
PERMOLEX-POLAR centrifuges are extremely suitable for use in swarf processing facilities without employing staff. They can be combined with all swarf conveying systems.



HOW TO CONTACT US
Address: Gebr. Steimel GmbH & Co.
Johann-Steimel-Platz 1
53773 Hennef
Germany
Phone:
Fax:
Email:
Website: 		+49 (0) 22 42 - 88 09 -0
+49 (0) 22 42 - 88 09 -187
vtz@steimel.com
www.steimel.com


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