Stretching devices EDS, PDS, HDS are intended for stretching of felts in the press part and drying fabric in the PM drying part. According to the way of exerting force of tretching, the stretching can be pneumatic or electric.

Design

This equipment consists of a motion screw with sidewalls, beddings and gearbox on the drive side and with the same parts on the service side. Both sides are connected by a shaft between the gearboxes. On the gearbox of the service side, there is a hand wheel installed. By using the wheel and a special wrench, it is possible to align the axis of beddings so that it is perpendicular to the PM axis. On the gearbox of the drive side, there is an overhung geared electric motor which sets both motion screws in motion at a time. By shifting the guide roll, installed in the stretcher bedding, it is possible to stretch or to relieve the felt (or the drying fabric). The protection of end positions is carried out by contactless inductive sensors which stop the engine when reaching one of the end positions.

Control devices the basic modification of the stretching equipment is without fabric (felt) tension sensing. It can be supplemented with a tension sensing system and automatic regulation of tension forces and accordingly completed with tensometric sensors under one of guide rolls of the fabric (felt) stretched and with a relevant regulation system.

Pneumatic stretching equipment PDS and hydraulic stretching equipment HDS

This equipment consists of two beams (on the service and drive side) with guides and a rack bar. An installed carriage with bearing housing travels on the guides. To provide parallel shifting both on the service and drive side, these carriages are coupled with a connecting shaft and linked to pinions that are engaged in rack bars on the beams. Both carriages can be set in motion by means of two pneumatic cylinders. By shifting the guide roll installed in the stretcher bedding, it is possible to stretch or to relieve the felt. The required stretching value is directly proportional to the air pressure value in the pneumatic cylinders, i.e. it is not necessary to use tensometric sensors, or additional control elements either. The air pressure value can be regulated by a reducing valve in the pneumatic circuit of the stretching equipment.

Main parts

Type EDS

• Stretcher body (1)
• Connecting shaft (2)
• Stretcher drive (electric gearbox) (3)
• Bearing housings (4)

Type PDS, HDS

• Beam with support (5)
• Pneumatic and hydraulic cylinder (6), pneumatic circuit
• Bearing housings (7)

Material

• Stretching system for the press and drying part is made of common steel, press part stretching can be made
• According to customer’s request also of stainless steel

Accessories

• Tensometric sensors with amplifier of output signal
• Hydraulic power unit and control system

Scope of delivery

• Complete machine according to main parts description
• Accessories optionally