Rope threading system

Rope threading system is used for automatic paper web threading through the threading ropes from press part via drying section onto the reel of the paper machine.

Design

It consists of set of pulleys, rope stretchers and if necessary rope drive. As next equipment can be used auxilliary chutes and air pipes with nozzles to be placed in transfer points. Two-rope system is applied normally, but for heavier paper kinds three-rope system can be used.

Rope pulleys

Pulleys dimensions (diameter, width, groove depth) depend on machine speed and paper substance weight.

Main parts

• pneumatic rope stretching
• set of pulleys with holders

Material

• standard design is common steel, eventually stainless steel according to customer´s inquiry

Accessories

• threading rope drive

Ropes drive

is used when the threading ropes do not pass through the drying cylinders or when the web contact is not enough for the rope dragging which might cause slips. The speed of the electric motor is controlled by a frequency converter and is deduced from the speed of a closest suitable roll. The drive is provided with a safety cover.

Scope of delivery

• complete machine according to the main parts description
• accessories optionally

Advantages

• reliability in service
• easy operation and maintenance

Machine design and work safety are in compliance with EU standards.

Leading pulleys

They serve for creating of a threading rope vee guiding (lower depth of a groove) in points of the transfer.

Guiding pulleys

They are designed for threading rope guiding in the machine (higher depth of a groove). They can be produced in a single or double modification.

Rope stretching system

This system is designed for stretching of the threading ropes individually. Its size depends on an overall rope length of a threading circle.

Vertical mechanical rope stretching device

Is done by a system of weights. The system allows rope stretching by a doubled stroke (L = 2 x STROKE).

Vertical pneumatic stretching

Vertical pneumatic stretching is done by pneumatic cylinders controlled by a pneumatic control board. The system allows rope stretching by a quadruple stroke of pneumatic cylinders (L = 4 x STROKE). Maximum rope stretching stroke (pulleys in end positions) is signalled by magnetic position sensors.

Horizontal pneumatic stretching

Is done by pneumatic cylinders controlled by a pneumatic control board. The system allows rope stretching by a quadruple stroke of pneumatic cylinders (L = 4 x STROKE). Maximum rope stretching stroke (pulleys in end positions) is signalled by magnetic position sensors.

Advantages of the pneumatic rope stretching

Continuous and easy setting of the necessary force of the threading ropes and a possibility of a force release when the paper is threaded in a fully automatic device.

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