Shredder Casing Segmentation via Mechanical Fastening

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Solution Overview

Problem

Conventional shredder machine casings face issues with welding distortion, leading to maintenance challenges and potential mechanical weak points due to large-surface welding assemblies, which complicates dimensional tolerance maintenance and increases post-processing efforts.

Innovation Solution

The method involves connecting machine casing components using screws or bolts instead of welding, employing high-strength materials like 19 Mn B 4, 35 B2, or 30 Cr 4, and utilizing retaining ring bolts with helical securing grooves to ensure secure fixation and resistance to vibrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If large-surface welding assembly groups are used to construct machine casings, then the machine casing can be produced as a unified structure, but welding distortion occurs which renders maintenance of dimensional tolerances difficult and creates mechanical weak points

Engineering Contradiction:

Improvestructural integrityVSAvoiddimensional tolerance

Core Design Contradiction:

Stability of the object's compositionVSManufacturing precision

Solution Approach 1:

The machine casing is divided into multiple component parts that are connected by screws or bolts rather than welded together. This segmentation allows each component to be manufactured separately with controlled dimensions, avoiding the welding distortion that affects large-surface welding assembly groups while maintaining structural integrity through mechanical fastening.

Inventive Principle:

Principle #1Segmentation

2Stability of the object's composition

If large-surface welding assembly groups are used, then the machine casing can be constructed as a unified structure, but the effort for minimizing welding distortion and post-processing becomes great

Engineering Contradiction:

Improvestructural integrityVSAvoidproduction time

Core Design Contradiction:

Stability of the object's compositionVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Component parts of the machine casing are pre-assembled into sub-assemblies using screws or bolts before final assembly. This preliminary mechanical fastening eliminates the need for extensive post-welding distortion correction and post-processing, significantly reducing production time while maintaining structural integrity.

Inventive Principle:

Principle #10Preliminary action

3Stability of the object's composition

If welding is used to connect machine casing components, then a unified structure is achieved, but mechanical weak points are created due to welding distortion

Engineering Contradiction:

Improvestructural integrityVSAvoidmechanical strength

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The welding process is replaced with a mechanical fastening system using screws or bolts to connect machine casing components. This substitution eliminates the thermal effects and distortion associated with welding, creating reliable mechanical connections that maintain structural integrity without introducing welding-induced weak points.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

This approach reduces welding distortion, ensures consistent quality, and allows for faster production and varied designs, while maintaining reliability and durability of the shredding device under operational stress, with reduced need for extensive stock and minimizing welding seam stress.

Implementation Method 1

connecting at least some of the component parts and/or assembly groups of the machine casing to each other by means of the screws or bolts

Methodology Applied

Scientific EffectMechanical Fastening: Mechanical Fastener

Implementation Method 2

utilizing retaining ring bolts with helical securing grooves to ensure secure fixation and resistance to vibrations

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 3

retaining ring bolts with helical securing grooves

Methodology Applied

Scientific EffectMechanical Interlocking: Mechanical Fastener

Data Source

PatentUS8844115B2Production method for a shredding device

Publication Date: 2014.09.30 LINDNER MANUEL

AI summary

A method for producing a machine casing of a shredding device includes providing component parts and/or assembly groups of the machine casing of the shredding device. Retaining ring bolts are provided, and at least some of the component parts and/or assembly groups of the machine casing are connected to each other through use of the retaining bolt rings.