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Stretching devices EDS, PDS are intended for stretching of felts in press part and drying wire in PM drying part. As for induced forces for stretching the equipment can be delivered with pneumatic or electric control.ELECTRIC STRETCHING EQUIPMENT EDS
Design
This equipment consists of a motion screw with sidewalls, bedaring arrangements and a gearbox on the drive side and with the same parts on the control side. Both sides are coupled with a connecting shaft between gearboxes. On the gearbox of the control side there is a hand wheel installed. By means of this wheel and a special wrench it is possible to align the axis of bearing arrangements so that it is across the PM axis. On the gearbox of the drive side there is an overhung geared electric motor which sets both motion screws in motion concurrently. By shifting the guide roll, installed in the stretcher bearing, it is possible to stretch or to relieve the felt (or the drying wire).
Control instrumentation: a basic modification of the stretching equipment is without wire (felt) tension sensing. It can be retrofitted with a tension sensing system and automatic regulation of drawing forces and accordingly completed with tensometric sensors under one of guide rolls of the wire (felt) to be stretched and with relevant regulating system.
Control instrumentation: a basic modification of the stretching equipment is without wire (felt) tension sensing. It can be retrofitted with a tension sensing system and automatic regulation of drawing forces and accordingly completed with tensometric sensors under one of guide rolls of the wire (felt) to be stretched and with relevant regulating system.
Main parts
- stretcher body (1)
- connecting shaft (2)
- stretcher drive (electric gearbox) (3)
- bearing housings (4)
Accessories
- tensometric sensors with amplifier of output signals
Scope of delivery
- complete machine according to main parts description
- accessories optionally
Material
- for drying part - structural steel St 52; for press part - standard modification is made of structural steel St 52; optionally steel 1.4301
Machine design and work safety are in compliance with EU standards.
Advantages
- fully automatic operation
- low operating costs
- functionality and reliability in service
PNEUMATIC STRETCHING EQUIPMENT PDS
Design
This equipment consists of two beams (on the control and drive side) with guides and a rack bar. An installed carriage travels on the guides with its bearing housing. To provide parallel shifting both on the control and drive side these carriages are coupled with a connecting shaft and linked to pinions being engaged in rack bars on beams. Both carriages can be set in motion by means of two pneumatic rolls.
By shifting the guide roll, installed in the stretcher bearing, it is possible to stretch or to relieve the felt. The required stretching value is directly proportional to the air pressure value in both pneumatic cylinders, i.e. it is necessary to use neither tensometric sensors nor additional control elements. Air pressure value can be regulated by a governor valve in the pneumatic circuit of the stretching equipment.
By shifting the guide roll, installed in the stretcher bearing, it is possible to stretch or to relieve the felt. The required stretching value is directly proportional to the air pressure value in both pneumatic cylinders, i.e. it is necessary to use neither tensometric sensors nor additional control elements. Air pressure value can be regulated by a governor valve in the pneumatic circuit of the stretching equipment.
Main parts
- bearer with support (1)
- pneumatic cylinder (2)
- bearing housings (3)
- pneumatic circuit
Technical parameters
Electric stretching equipment EDSPneumatic stretching equipment PDS
Example of stretching equipment installation in paper machine
Photos
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