Modular Chipper Inserts for Consistent Wood Chip Size

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Solution Overview

Problem

Wood grinders struggle to produce high-quality wood chips from lower quality wood waste due to inherent limitations in existing conversion systems, leading to inconsistent chip size and quality, and the cost of acquiring a separate wood chipper is prohibitive for many wood processors.

Innovation Solution

The development of chipper inserts that can be assembled on a hammermill rotor to create a continuous chipper drum with cutter pockets and double-edged blades, allowing for selective conversion of a wood grinder into a chipper, with features like offset cutters and spacer inserts to minimize dead spaces and control chip size, and the ability to reverse cutters for extended use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a wood grinder is converted to a chipper using conventional knife inserts with large spaces between them, then the wood grinder can produce wood chips, but the chip quality is poor and chip size is inconsistent

Engineering Contradiction:

ImproveAbility to convert wood grinder to chipperVSAvoidChip size consistency

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The rotor is divided into multiple segments or zones with different insert configurations. Some regions have knife inserts for chipping, while other regions have hammer inserts for grinding, allowing the single rotor to perform both functions with optimized performance in each zone

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The rotor is designed to accommodate multiple types of inserts (knife and hammer) that can be interchangeably mounted on the same rotor structure, making the wood grinder universally capable of both chipping and grinding operations without requiring separate machinery

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If conventional knife inserts are used in a wood grinder rotor, then the machine can be converted to a chipper, but dead spaces are created that reduce chip quality

Engineering Contradiction:

ImproveConvertibility to chipperVSAvoidChip quality

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The rotor design allows dynamic configuration of inserts based on operational needs. The spacing and positioning of knife inserts can be adjusted or reconfigured to eliminate dead spaces, and the system can adapt between chipping and grinding modes by changing insert arrangements

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Different regions of the rotor are designed with different insert types and configurations optimized for specific functions. Knife inserts are positioned in locations that eliminate dead spaces and optimize chip quality, while hammer inserts are positioned for effective grinding, with each local area having quality optimized for its specific purpose

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If a processor purchases both a wood grinder and a wood chipper, then both high and low quality wood waste can be processed, but the cost is prohibitive

Engineering Contradiction:

ImproveAbility to process different wood qualityVSAvoidNumber of machines required

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The functionality of separate wood grinder and wood chipper machines is merged into a single rotor system. By combining different insert types on one rotor, the system consolidates multiple machine functions into one device, reducing the total number of machines needed

Inventive Principle:

Principle #5Merging (Combining)

4Object-affected harmful factors

If hammer inserts are used in a wood grinder, then lower quality wood waste with contaminants can be processed, but the output is ground wood not suitable for pneumatic feed systems

Engineering Contradiction:

ImproveAbility to handle contaminantsVSAvoidClumping tendency of ground wood

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The insert configuration parameters are changed based on the wood quality being processed. For lower quality wood with contaminants, hammer inserts provide durable processing, while for higher quality wood suitable for chips, knife inserts are used to produce non-clumping output appropriate for pneumatic feed systems

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8061640B2Interchangable chipper inserts for wood grinder

Publication Date: 2011.11.22 ALAMO GROUP

AI summary

A plurality of chipper inserts that may be installed on a hammermill rotor in place of the hammer inserts to selectively convert the rotor to a chipper. The chipper inserts include drum surfaces that cooperatively define a chipper drum. The chipper inserts may include cutter inserts that have a cutter disposed in a cutter pocket. The chipper drum may be a generally continuous cylindrical interrupted essentially only by the cutter pockets. The cutters and cutter pockets may be positioned in essentially any desired pattern around the drum. The chipper inserts may include a left cutter insert, a center cutter insert, a right cutter insert and three different size spacer inserts. The different types of cutter inserts and spacer inserts may be installed about the rotor with at least one left cutter insert mounted on the left end of the chipper drum and at least one right cutter insert mounted on the right end of the chipper drum. The chipper inserts may be configured in quadrant sections, such that it takes four inserts to extend around the rotor.