Purpose
In a paper machine there are several forming wires and felts, called fabrics in general, that function to support the paper being manufactured. These fabrics travel over networks of rolls in cyclical patterns. Since all of these rolls cannot be exactly level and aligned with each other, devices are needed to keep the fabrics running properly in the centre of the rolls. These devices, together called a guiding system, function to keep each fabric running in the centre of the rolls of the paper machine.
A Wire and Felt Guiding System is composed of mechanical devices used to keep the fabric running properly in the centre of the rolls over which it travels. This is done by pivoting one end of the guide roll in the proper direction to correct the errant fabric travel.
H & T Proportional Bellows Auto Guide avoids damage to wire or felt caused by their cross-directional movements, over running or pre-mature creasing and the resultant loss of production. An auto guide is the most convenient, reliable and economical device using mill’s normal air supply for its auto operation.
Principle of Guiding
The guiding of fabrics is based on the principle that the fabric will always leave a roll perpendicular to its rotational axis. This is governed by the direction of fabric travel. This dictates that the fabric will always travel toward the end of the roll it encounters first. Hence the guide roll is automatically moved to change the fabric travel.
Design
H & T Wire and Felt Guide consist mainly of a pneumatically operated automatic guide and guide sensor to control the movement of the guide. The guide holds the bearing housing of one end of a roll and moves it back and forth using air-pressurized rubber air bellows. The guide sensor is a control device for the guide and regulates the air flow to each of the guide bellows.
When triggered appropriately, the rubber bellows swivel the guide roll, mounted on-site on the positioning unit, in one or the other direction respectively.
An edge sensing device is required to control the guide that continuously monitors the fabric run that minimize fabric wear by avoiding fabric run-off. It determines the actual position of the fabric and specifies its target position. The one supplied along is the contacting pneumatic type palm assembly.
MODELS
| WIRE/FELT/SCREEN RANGE TYPE Upto 3000 mm wide 80-160/60 From 3000 to 3800 mm 140-200/65 Over 3800 mm wide upto 4500 mm 160-250/70 | |
Specifications
Dimensions
All dimensions in mm.
All models can be provided with manual arrangement also for which the height “H” & “H1” will be increased by 100 mm.
AUTO GUIDE WITH MANUAL ARRANGEMENT
AUTO GUIDE WITHOUT MANUAL ARRANGEMENT
VARIANTS:
Guide is available in two variants
With Bearing Yoke
With Mounting Plate for Pillow or Plummer Block
(With Mounting Plate for Pillow or Plummer Blocks)
The guide is universal type that can be mounted horizontally, vertically or inclined.
| Material of Construction Main Body Mild Steel / Cast Steel / Stainless Steel | |
| Guide Roll bearing housing bracket Cast Steel / Stainless Steel Tracer unit ( Palm Assembly ) Body in Aluminium / Stainless Steel Internal Assembly Bronze and Stainless Steel Sensor Palm Stainless Steel with ceramic insert / Stainless Steel Rotating Roller Stand for Palm SS-304 Rubber Bellows For temp upto 70°C (Upto 108°C on request) Needle Bearings Filled with special high temperature water Resistant grease | |
Guide Positioning
θ = 20º for Wire or 30º for Felt
x = Lead in distance should be 2/3W
y = Lead out distance should be 1/3W
W= Width of wire/felt
PNEUMATIC CONNECTIONS
VR – Volume Control Valve
R – Air Regulator
F – Air Filter
SV – Shut off valve
DV – Drain Valve
W – Wire/felt/screen
P – Palm
SYSTEM ADVANTAGES
Maintaining a straight fabric run with minimum fabric oscillation
- Avoid fabric run-off
- Minimize fabric edge wear
- Reduce sheet breaks
- Optimize Paper Productivity
DESIGN ADVANTAGES
- Well proven reliable design
- Easy installation and zero maintenance
- Efficient and prompt after-sale service by competent engineers/technicians
- Highest tracking accuracy for most demanding applications
- Proportional and accurate response
- Low air consumption
QUESTIONNAIRE FOR FELT/WIRE AUTO GUIDE
- Machine Speed: –
- Roll Diameter/Weight: –
- Position Wet or Dry: –
- Wire/Felt/Screen Width: –
- Surrounding Temperature: –
- Bearing Housing Drawing: –
- Wrap angle over roll: –
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