Front-Side Rotor Bit Extraction for Quiet Paving Machine Service

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Solution Overview

Problem

Existing methods for removing bits from rotors in paving machines are inefficient, requiring frequent replacement and involving constrained working conditions, noise pollution, and reduced visibility due to the need to access the bits from the back side of the bit holder.

Innovation Solution

A bit removal device comprising a support, an extractor, and an actuator that engages the bit holder from the front side, allowing the extractor to move relative to the support to extract the bit without requiring specific bit holders or backside access, utilizing hydraulic, pneumatic, or electric actuators for universal compatibility and reduced noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If bits are removed from the back side of the bit holder, then the bit can be extracted, but the technician's visibility is reduced and the working area is constrained

Engineering Contradiction:

Improvebit removal accessibilityVSAvoidtechnician visibility

Core Design Contradiction:

Ease of operationVSIllumination intensity

Solution Approach 1:

The patent inverts the conventional approach by removing bits from the front side of the bit holder rather than the back side. The extractor engages the bit from the front, allowing the technician to work from the accessible front side of the rotor housing, thereby improving visibility and working conditions while maintaining effective bit removal capability.

Inventive Principle:

Principle #13The other way round (Inversion)

2Productivity

If conventional bit removal tools are used, then bits can be removed, but significant noise pollution is generated

Engineering Contradiction:

Improvebit removal efficiencyVSAvoidnoise pollution

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces conventional mechanical impact-based removal tools with a controlled extraction system. The extractor uses a controlled mechanical advantage system with an actuator that applies gradual, controlled force to extract the bit, eliminating the loud impacts and noise associated with traditional hammer-based removal methods while maintaining removal efficiency.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If specific types of bit holders with back openings are used, then bits can be removed from the back, but the device lacks universal compatibility

Engineering Contradiction:

Improvebit holder accessibilityVSAvoidbit holder compatibility

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent designs the extractor and support system to be universally compatible with various bit holder types. The support engages the bit holder from the front side in a manner that accommodates different bit holder geometries, and the extractor can engage the bit itself rather than requiring specific features on the bit holder, thereby achieving universal compatibility across different bit holder designs.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11203103B2Rotor bit removal device

Publication Date: 2021.12.21 CATERPILLAR PAVING PROD INC

AI summary

A bit removal device may include a support, an extractor coupled to the support, and an actuator. The support is configured to engage a bit holder from a front side of the bit holder. The extractor is configured to engage a bit from the front side of the bit holder. The actuator is configured to move the extractor relative to the support to extract the bit from the bit holder.