Filter Plate Welded Edge Bead for Abrasion Resistance

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Solution Overview

Problem

Conventional filter cloths in filter presses have a short service life due to mechanical stress and abrasive wear, particularly at seams and cloth neck areas, leading to frequent maintenance and operational disruptions.

Innovation Solution

Implementing a welded connection between filter cloth edges instead of traditional sewing, using heat or pressure to create a permanent, abrasion-resistant bond that protects the connection from abrasive particles and reduces production time and costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If sewing is used to attach filter cloth to filter plate, then the filter cloth can be securely fastened, but the sewing needle damages the filter fabric creating needle holes that impair separation efficiency and the thread wears down due to abrasive effect

Engineering Contradiction:

Improvesecure fastening of filter clothVSAvoidneedle holes impairing separation efficiency and thread wear

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention extracts and removes the harmful sewing needle and thread from the filter cloth attachment process. Instead of using sewing, the patent uses a bead formed by folding and welding the filter cloth edge itself, eliminating needle holes and thread wear while maintaining secure fastening through the bead-in-groove mechanism.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention replaces the mechanical sewing system (needle and thread) with a thermal welding system. The filter cloth edge is folded and welded to form a bead, which is then inserted into a groove on the filter plate. This substitution eliminates the harmful effects of needle penetration and thread abrasion while achieving reliable attachment.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of manufacture

If conventional sewing methods are used to connect filter cloth edges, then the filter cloth can be assembled, but the seams and cloth neck areas suffer from mechanical stress and abrasive wear leading to short service life

Engineering Contradiction:

Improvefilter cloth assemblyVSAvoidservice life of filter cloth

Core Design Contradiction:

Ease of manufactureVSDuration of action of stationary object

Solution Approach 1:

The invention changes the physical state and connection method of the filter cloth edge. Instead of mechanical sewing, the edge is folded and welded (thermal connection) to form a bead. This parameter change from mechanical to thermal connection eliminates wear at the connection point while maintaining ease of assembly, significantly extending service life.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If thread is used to secure filter cloth, then the filter cloth can be attached to the filter plate, but the thread wears down due to considerable mechanical stress from abrasive effect of flowing liquid

Engineering Contradiction:

Improveattachment of filter clothVSAvoidoperating period before thread wear

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The invention extracts and eliminates the thread from the attachment system. The filter cloth edge is folded and welded to form a bead that is inserted into a groove on the filter plate, creating a threadless attachment system that is immune to thread wear from abrasive liquid flow.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention replaces the consumable thread (which wears out and requires replacement) with a durable welded bead structure. The welded connection is permanent and resistant to wear, eliminating the need for frequent replacement due to thread degradation.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 welded connection significantly extends the service life of filter cloths by preventing wear and tear, reducing maintenance needs, and maintaining filtration efficiency with improved durability and cost-effectiveness.

Implementation Method 1

at least partially connected to each other by a welded joint

Methodology Applied

Scientific EffectWelding: Welding

Implementation Method 2

using heat or pressure to create a permanent, abrasion-resistant bond

Methodology Applied

Scientific EffectHeat: Heating

Data Source

PatentEP2514498B1Filter plate

Publication Date: 2019.10.23 MAYER LUDWIG

Figure 1~6
Figure 3~4

AI summary

The filter cloth (2) has a woven fabric turned downwardly in an edge region (22) such that a filter cloth region (23a) is arranged on another filter cloth region (23b). The both regions are partially connected with each other by individual welding connections that are spaced from each other. The fabric is made of thermoplastic material e.g. polypropylene, polyethylene terephthalate and polyamide, and/or organic fibers e.g. cotton and glass- or carbon fibers. An accommodating space (24) is formed in the edge region to accommodate a flexible accommodating body (25) e.g. O-ring and string. An independent claim is also included for a filter plate.