Tail-threading Blower with Flow-preventing Plate for Compact Fibrous Web Machines
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Solution Overview
Problem
Existing tail-threading devices in fibrous-web machines, particularly those for board manufacturing, require significant space and are complex, making them difficult to implement and locate efficiently in the machine.
Innovation Solution
A novel tail-threading arrangement using asymmetrically shaped blowers with flow-preventing plates to divert the tail's travel direction in both machine and cross-machine directions, allowing for a more compact design that fits into smaller spaces and simplifies the cutting process by utilizing air flows to create a vacuum for cutting and conveying the tail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional tail-threading devices are used for board manufacturing, then the cutting and conveying function is achieved, but the device requires significant space and becomes complex
Solution Approach 1:
The patent replaces complex mechanical cutting devices with a pneumatic system. A jet of air is directed at the tail to break it, eliminating the need for mechanical knives and complex mechanical conveyance mechanisms. The air jet serves both as the cutting tool and as the conveying force, significantly simplifying the overall device structure while maintaining reliable tail-threading function.
2Reliability
If conventional tail-threading devices are used, then the cutting function is achieved, but the device is difficult to locate efficiently in the machine
Solution Approach 1:
By replacing the mechanical cutting and conveying system with a pneumatic jet system, the patent creates a compact device that can be easily positioned at optimal locations within the machine. The air jet apparatus requires minimal space and can be directed precisely at the tail, making installation and adjustment straightforward compared to bulky mechanical devices.
3Manufacturing precision
If mechanical knives are used for cutting the tail, then the cutting function is achieved, but stress is applied to the tail during cutting
Solution Approach 1:
The patent substitutes mechanical knife cutting with pneumatic jet breaking. The high-velocity air jet fractures the tail through aerodynamic forces rather than mechanical contact, eliminating the stress and potential damage that would occur with blade contact. This method maintains cutting precision while preserving tail integrity by avoiding direct mechanical force application.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The arrangement reduces the required space for tail-threading, allows for more flexible placement of the device, and effectively handles both paper and board webs by minimizing stress on the tail during cutting, ensuring efficient and precise tail-threading without mechanical knives.
Implementation Method 1
there is arranged an intensive blow blowing away from the roll and the tail falls within the range of a vacuum created by this blow
Implementation Method 2
The discharging air causes an intensive vacuum at the point of the nozzle holes and the tail is sucked fast in the strongly turbulent nozzle flow
Implementation Method 3
a friction element which is arranged to create a vacuum between the friction element and the tail when the blower operates
Data Source
AI summary
The primary object of the invention is an arrangement in the fibrous-web machine for tail-threading of a fibrous web, a tail-threading apparatus and a method for tail-threading. The arrangement comprises a tail-threading apparatus which is arranged to receive a tail separated from the fibrous web and to guide it further to the subsequent section of the fibrous-web machine in the longitudinal direction of the fibrous-web machine, at least one blower (102, 104) which is provided with a flow-preventing plate (103, 105) and arranged to guide the tail towards said tail-threading apparatus for feeding the tail to the tail-threading apparatus, whereby said at least one blower (102, 104) with its flow-preventing plate (103, 105) is arranged to divert the travel direction of tail on the longitudinal vertical plane and the cross-directional vertical plane of the fibrous-web machine, and said tail-threading apparatus comprises a rope nip receiving the tail the tail-threading ropes of which are supported by a rope pulley (108) which is arranged to rotate on a plane in the direction of the longitudinal axis of the fibrous-web machine and oblique in relation to the vertical direction and which is arranged to receive the diverted tail in the diverted travel direction. The invention enables the implementation of a tail-threading process fitting into a smaller space.