Threading and trimming water jet

Threading and trimming water jet is designed for trimming of paper web edges in PM wire part and for making a wedge-shaped paper web end for its threading in PM press and drying parts. It is also used for fast paper web cutting in case of web break. Standard design consists of one threading water jet (for  web break case) and two trimming water jets.

Threading water jet (for web break case) is controlled by an electric motor and an electromagnetic clutch with possibility of manual control by a hand wheel. This jet allows to thread the paper web from the PM wire part to the press part and to cut the paper web in case of its break. The threading tail width of the paper web can be set by means of inductive sensors as required.

Trimming water jets are intended for paper web trimming to a required size. They can be adjusted manually within a certain range.

Design

Basic parts of threading and trimming water jet comprise linear rails with a carriage. The threading water jet (for web break) is attached to this carriage travelling on rails. It is driven by cogged belt gearing and a worm-geared electric motor, coupled through an electromagnetic clutch intended for its uncoupling, if necessary. The threading water jet can be controlled manually by a hand wheel then. Its travel speed can be regulated by a frequency converter in dependence on the PM operating speed. The travel itself is monitored by four inductive sensors. Two of them are pre-set to the given threading tail width and the other two are used for protection in end positions. An electric control unit of threading and trimming water jet is located upon customer's requirements. The own threading and trimming jets are provided with removable nozzles with needle-shaped jet. The nozzles distance from the wire is to be set according to the given paper stock. A pressure water supply hose for the threading jet is put on an energy chain. The whole equipment is mounted on stands to main beams of the PM wire part.

Main parts

• linear guides - beam with V-belt pulleys and cogged belt (1)
• worm gearbox (2)
• electromagnetic clutch 
  
• trimming water jets (3)
• threading water jet with travel carriage (4)
• water distribution to trimming water jets and threading water jet
  
• manual drive (5)
• inductive sensors
• guards (6)
• stands with coupling to wire part (7)
  

Accessories

• automatics intended for el. motor switching (threading w. jet)
  

Delivery scope

• complete equipment according to main parts description
  
• accessories optionally
  

Material

• bearing structure and guards - steel 1.4301 or 1.4404
• linear rails - aluminium alloy, steel 1.4301 
  

Technical parameters