Ring Saw Water-Flushing Guide Roller for Low-Friction Cutting

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Solution Overview

Problem

Ring saws experience high frictional losses and laborious blade replacement due to inefficient guidance systems and abrasive dust/sudge wear, particularly with traditional eccentric drives and water cooling methods.

Innovation Solution

The ring saw incorporates a tool holder with a guide roller and roll system, featuring conical guide grooves and rotatable components to minimize friction, and a water guide that cleans the guide roller before reaching the blade, reducing wear and facilitating tool-free blade exchange through a movable driving wheel and bevel gear mechanism.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If water is used to cool the ring saw blade, then the blade is cooled effectively, but the water carries dust and sludge into the ring saw causing high wear

Engineering Contradiction:

Improveblade coolingVSAvoidabrasive wear from dust and sludge

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The harmful dust and sludge are extracted from the water stream by the guide roller positioned upstream, separating the cooling function from the contaminant removal function. The guide roller acts as a filter that removes particles before water reaches the blade, allowing effective cooling without introducing abrasive contaminants.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The guide roller serves as an intermediary element between the water source and the ring saw blade. It mediates the interaction by cleaning the water stream and positioning the water flow to cool the blade without allowing dust and sludge to enter the ring saw mechanism.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Power

If traditional guidance systems are used with eccentric drives, then the ring saw blade can be driven, but high frictional losses occur and blade replacement is laborious

Engineering Contradiction:

Improveblade driving capabilityVSAvoidfrictional losses

Core Design Contradiction:

PowerVSLoss of energy

Solution Approach 1:

The guide roller is designed to be freely rotatable about an axis that slopes relative to the cutting plane, allowing dynamic adaptation to the blade's motion. This rotational freedom reduces friction by enabling the guide roller to self-adjust during operation, maintaining optimal contact with the blade while minimizing energy loss.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Instead of using traditional fixed guidance systems that create high friction, the invention inverts the approach by using a movable, rotatable guide roller that follows the blade's motion. This reverses the conventional paradigm of fixed guides, transforming the guidance system into a dynamic, low-friction mechanism.

Inventive Principle:

Principle #13The other way round (Inversion)

3Temperature

If the guide roller is positioned to cool the blade directly, then cooling is effective, but the guide roller accumulates dust and sludge reducing its lifespan

Engineering Contradiction:

Improveblade cooling efficiencyVSAvoidguide roller lifespan

Core Design Contradiction:

TemperatureVSDuration of action of stationary object

Solution Approach 1:

The guide roller is positioned upstream in the water flow direction, performing preliminary cleaning of the water stream before it reaches the blade. This preliminary action removes dust and sludge from the water, preventing accumulation on the guide roller and extending its operational life while maintaining effective cooling.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The guide roller converts the potentially harmful water stream carrying dust and sludge into a beneficial cleaning mechanism. By positioning itself upstream, the guide roller uses the water flow to clean itself and the surrounding area, transforming the harmful contaminated water into a self-cleaning mechanism that extends component lifespan.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 design reduces frictional losses, extends guide roller life, and simplifies blade replacement by allowing tool-free operation, while the water guide minimizes abrasive wear and maintains cleanliness.

Implementation Method 1

A water guide has an outlet, which is directed at the guide roller. The guide roller is cleaned by the water

Methodology Applied

Scientific EffectFluid spray cleaning: Fluid Spray

Implementation Method 2

The ring saw blade is cooled by means of water

Methodology Applied

Scientific EffectConvection cooling: Convection

Implementation Method 3

A guide roller is arranged on one side of the cutting plane in order to guide the ring saw blade from one side

Methodology Applied

Scientific EffectRolling friction: Roller

Data Source

PatentUS20220355402A1Ring Saw with Water Flushing System

Publication Date: 2022.11.10 HILTI AG

AI summary

A ring saw includes a ring saw blade, a tool holder that guides the ring saw blade in a cutting plane, a receiving space in which the tool holder is disposed, a motor, and a driving wheel where the ring saw blade is drivable in the cutting plane by the driving wheel and the driving wheel is coupled to the motor. A guide roller is disposed on a side of the cutting plane where the ring saw blade is guidable by the guide roller from the side and where an outlet of a water flushing system is directed at the guide roller.