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Products & Equipment

Diaphragms

with innovative Monobloc® construction

 

Reduced energy needs, increased efficiency: The installation of a diaphragm can increase the economy of a grinding plant enormously. The Monobloc® frame developed by Christian Pfeiffer is very stable, durable and especially tough in use. This diaphragm construction is seen as today’s most advanced state-of-the-art solution for modern grinding plants.

 

Intermediate Diaphragm

Material flow control and grain size limitation

 

Thanks to the material flow control and the limitation of the largest grain size by the intermediate diaphragm, the material stays in the first grinding compartment until it reaches optimum size; only then it moves into the second compartment  The separation of air and material flow, a major development by Christian Pfeiffer, ensures that so-called dead zones (zones without material being ground) directly behind the intermediate diaphragm are avoided. The result is a clearly more efficient grinding process.

 

  • Separation of the ball mill into two (or three) compartment using the intermediate diaphragm
  • Each compartment is filled with different ball charges and sizes
  • Optimum material flow control and grain size limitation
  • Unique separation of air and material flows in the low-wear material flow arrangement: Avoidance of dead zones and lower wear on the grinding balls on the intermediate diaphragm – use of the entire grinding length of the second (and third) grinding compartment
  • ‘Floating’ installation reduces tension between the mill tube and the diaphragm structure. In this way: There is no tension between the intermediate diaphragm and the mill tube, the mill tube is stabilized, while at the same time, relative movements and deformations of the diaphragm are avoided
  • The structure of the intermediate diaphragm in the Monobloc® version supports the mill tube and works against deformation
  • Easier maintenance and replacement of main wear zones through division of the slotted and backside plates into two to four rings
Intermediate Diaphragm

Discharge Diaphragm

Individual adjustment to the grinding plant

 

The discharge diaphragm allows the ground material to pass but retains the grinding balls in the grinding chamber. Christian Pfeiffer adjusts the diaphragm individually to the existing grinding plant, fixing it either on the discharge mill head or floating on the mill shell.

 

  • Ground material passes through the intermediate diaphragm, grinding balls are retained
  • Fixation on discharge mill head or on the mill shell possible
  • Adjustment of the inner diaphragm plates enables adjustment to the required maximum mill filling level
  • Easier maintenance and replacement of main wear zones through division of the slotted plates into two to four rings
Discharge Diaphragm

Open Lifter Diaphragm

For mills with integrated drying chamber

 

By means of the open lifter diaphragm, the drying chamber integrated into the mill tube is separated from the grinding compartment. The steel grades used can easily withstand the up to 400°C hot gases found in the drying compartment.

  • Separation of grinding compartment and drying chamber integrated into the mill tube
  • Use of steel grades with almost identical thermal expansion coefficients, in order to withstand the high temperatures (300–400°C) and high axial pressure
  • Extremely high mechanical and thermal loads can be absorbed
  • Adjustment of the diaphragm plates enables the adjustment of the central opening to the required maximum mill filling level
  • Construction of the diaphragm in Monobloc® version: supports the mill tube and resists deformation. Can also be supplied in segmented design
  • Easier maintenance and replacement of main wear zones through division of the slotted backside plates into two to four rings
Open Lifter Diaphragm

Double Outlet Diaphragm

For mills with central discharge

 

Mills with central discharge are fitted with a double outlet diaphragm. The material is transported from both head sides of the mill towards the diaphragm, then out through the openings in the mill shell.

 

  • For mills with central discharge (opposite material flow direction)
  • Optimum material loads in the grinding chambers through special retention rings in the diaphragm
  • Adjustment of the diaphragm plates enables the adjustment of the central opening to the required mill filling level
Double Outlet Diaphragm

Slotted and Backside Plates for Diaphragm

Hardened rolled steel and innovative design

 

All diaphragm plates from Christian Pfeiffer are produced using highly wear- and breakage resistant rolled steel which is a superior material compared to plates produced using cast material. The innovative design of the slotted and backside plates makes the entire grinding process even more efficient and ensures a long service life for the equipment.

  • Manufactured using highly wear and breakage resistant special rolled steel with up to 60 HRC
  • Plate slots with optimum narrow conical openings for optimum material flow and high process stability prevent natural blockages: The material is transported onward only after it has been sufficiently ground.
  • Innovative fastening system: Bolt fastening with conical swages ensure accurate fitting for the plates. Efficient use of the plate up to a residual thickness of 8–10 mm. Utilisation rate of 75% compared to 60% in conventional systems. Thanks to the use of tear-off bolts fitting errors are effectively reduced and the plates are securely fixed to the frame.
  • Long service life thanks to simple maintenance and partial replacement of the wear parts: Depending on the mill diameter the slotted plate construction is divided into two to four rings. In the event of wear only those plate rings that are most affected need to be replaced
  • If required special slotted plates with lifters for those areas subjected to the most wear
Backside Plates
Slotted Plates