Abrasive Cutting Tool Vibration for Efficient Electric Construction Equipment
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Solution Overview
Problem
Electrically powered construction equipment, such as power cutters and core drills, exhibit reduced cutting efficiency compared to combustion engine-powered counterparts due to the absence of vibration, which is beneficial for cleaning abrasive elements and improving interaction with the work object.
Innovation Solution
Incorporating a vibration device that generates controlled non-ultrasonic vibrations below 15 kHz, preferably below 5 kHz or 1 kHz, to emulate combustion engine vibrations, which can be activated/deactivated by user input, configured for amplitude and frequency, and integrated with the tool axle to enhance cutting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electric motor is used to power abrasive cutting tool, then environmental friendliness and quiet operation are improved, but cutting efficiency deteriorates due to absence of vibration
Solution Approach 1:
The patent applies mechanical vibration by introducing a vibration device that generates controlled vibrations in the frequency range of 1-15 kHz (preferably 2-5 kHz) to the abrasive cutting tool. This vibration cleans the abrasive elements during operation, removing debris and restoring cutting edges, thereby maintaining high cutting efficiency in electrically powered equipment without requiring combustion engine vibrations
Solution Approach 2:
The patent changes the vibration frequency parameter from the traditional combustion engine range to an optimized 1-15 kHz range (preferably 2-5 kHz). This parameter optimization allows the vibration device to effectively clean abrasive elements while being compatible with electric motor operation, resolving the contradiction between environmental benefits and cutting efficiency
2Productivity
If vibration device is added to generate controlled vibrations, then cutting efficiency is improved, but device complexity increases
Solution Approach 1:
The vibration device is designed to be integrated with the existing electric motor and drive arrangement, allowing the same motor to serve both as the primary power source for the abrasive cutting tool and as the driver for the vibration device through a coupling mechanism. This multi-functionality reduces overall system complexity despite adding vibration capability
Solution Approach 2:
The patent introduces a coupling mechanism as an intermediary between the electric motor and the vibration device. This coupling allows efficient transmission of vibratory motion while maintaining independence of the two functions, enabling easy integration without significantly increasing overall device complexity
3Productivity
If vibration frequency is set below 15 kHz to emulate combustion engine vibration, then cleaning effect of abrasive elements is improved, but precision of vibration control deteriorates
Solution Approach 1:
The patent incorporates a control device that receives feedback from sensors monitoring the vibration frequency and amplitude. This feedback loop allows the control device to adjust the motor parameters in real-time, maintaining precise control of vibration frequency within the 1-15 kHz range and optimizing the cleaning effect of abrasive elements during operation
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 vibration device improves cutting efficiency by cleaning abrasive elements and enhancing the interaction between the abrasive elements and the work object, mimicking the benefits of combustion engine vibrations without the drawbacks.
Implementation Method 1
a vibration device arranged to generate a controlled amount of vibration of the abrasive cutting tool. The vibration is generated in a frequency band below 15 kHz, i.e., the vibration is a non-ultrasonic vibration
Data Source
AI summary
Electrically powered construction equipment (100, 1200, 1300, 1400, 1500) comprising an electric motor (120) arranged to power an abrasive cutting tool (130) via a drive arrangement (200), the abrasive cutting tool (130) comprising abrasive elements (131) arranged on a carrier (132) of the cutting tool (130), where the abrasive elements (131) are arranged distanced from each other on the carrier (132) and follow a closed path during operation of the construction equipment, the construction equipment (100, 1200, 1300, 1400, 1500) further comprising a vibration device (120, 300, 350, 400, 500, 600, 700, 800) arranged to generate a controlled amount of vibration of the abrasive cutting tool (130), wherein the vibration is generated in a frequency band below 15 kHz.