Pulp Screen Plate Grooves for Low-Wear Rotor Gap Control

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Solution Overview

Problem

Wear strips on pulp screening machines wear out quickly, leading to increased gaps between the rotor and screen plate, which reduces cleaning efficiency, throughput, and de-flaking rate.

Innovation Solution

Replace conventional strip-type projections with concave grooves on the screen plate, forming an even gap with the rotor, minimizing impurity entry and wear by designing grooves with varying widths and depths to adapt to impurity accumulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If wear strips are installed on the screen plate surface, then cleaning function and de-flaking function are provided, but the wear strips wear out quickly and create larger gaps between the rotor and screen plate surface

Engineering Contradiction:

Improvecleaning efficiencyVSAvoidwear strip life

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

Instead of adding protruding wear strips that create gaps, the patent inverts the approach by creating concave grooves that receive and contain wear material. The grooves are designed to accommodate wear strips or wear-resistant material while maintaining a flush surface, thereby eliminating the gap problem while preserving the cleaning and de-flaking functions.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent embeds wear strips or wear-resistant material within concave grooves on the screen plate surface. This nesting approach allows the wear strips to be contained within the grooves, preventing them from protruding and creating gaps with the rotor, while still providing the necessary cleaning and de-flaking functions.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If wear strips are used on the screen plate, then cleaning and de-flaking functions are achieved, but the gap between rotor and screen plate increases, reducing throughput and de-flaking rate

Engineering Contradiction:

Improvecleaning functionVSAvoidthroughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent inverts the conventional approach by instead of having protruding wear strips that increase the gap, it creates concave grooves that maintain a flush surface with the rotor, thereby minimizing the gap and maximizing throughput while still providing cleaning and de-flaking functions through the groove structure.

Inventive Principle:

Principle #13The other way round (Inversion)

3Reliability

If wear strips are installed on the screen plate, then cleaning function is provided, but impurities enter the gap between rotor vanes and screen plate, increasing wear

Engineering Contradiction:

Improvecleaning efficiencyVSAvoidimpurity entry and wear

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent embeds wear-resistant material or wear strips within concave grooves, creating a nested structure that prevents impurities from entering between the rotor vanes and screen plate. The grooves act as containment structures that trap wear debris and prevent it from interfering with the rotor-screen plate interface, thereby reducing wear.

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentUS12509823B2Screen plate and pulp screening machine

Publication Date: 2025.12.30 ANDRITZ CHINA

AI summary

A screen plate for a pulp screening machine. On the side towards the rotor of the pulp screening machine, the screen plate has concave grooves. Except in the region of the grooves, an even gap is formed between the vane of the rotor and the surface of the screen plate, wherein the rotor vane front edge of the pulp screening machine is arranged at an angle to the grooves. Also, a pulp screening machine with the screen plate.