Electric Hammer Vibration Reducer with Load-Adaptive Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric hammer vibration reduction techniques, such as dynamic vibration reducers and counter weights, require further improvement to optimize vibration reduction under both loaded and unloaded driving conditions.
Innovation Solution
An electric hammer with a vibration reducing mechanism that adjusts its amplitude, frequency, and phase to optimize vibration cancellation, using a dynamic vibration reducer or counter weight mechanism driven by a motor controller that detects load conditions through motor current changes, allowing for optimized vibration reduction in both modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a dynamic vibration reducer or counter weight mechanism is used to reduce vibration during hammering operations, then vibration reduction effectiveness is improved under loaded conditions, but the device complexity and control system complexity increase
Solution Approach 1:
The patent replaces mechanical detection mechanisms with an electrical detection system that uses motor current as a proxy for load conditions. The motor controller detects load changes through current variations and automatically adjusts the vibration reducing mechanism accordingly, eliminating the need for separate mechanical sensors and switches while achieving the same control function
Solution Approach 2:
The motor controller is given multiple functions: it not only controls the driving motor but also detects load conditions through current monitoring and controls the vibration reducing mechanism. This multi-functional approach consolidates what would otherwise require separate dedicated components into a single integrated controller, reducing overall system complexity
2Object-affected harmful factors
If the vibration reducing mechanism is always driven at maximum amplitude to optimize vibration reduction under loaded conditions, then vibration reduction effectiveness is improved during hammering, but energy consumption increases during unloaded operation
Solution Approach 1:
The vibration reducing mechanism transitions from a static, fixed-amplitude system to a dynamic, variable-amplitude system. The drive amplitude is continuously adjusted based on real-time detection of load conditions, allowing the system to operate at maximum amplitude only when needed (during loaded hammering) and reduce or eliminate amplitude during unloaded operation, thereby optimizing energy consumption
Solution Approach 2:
The system implements a feedback control loop where the motor controller continuously monitors motor current to detect load conditions and uses this information to adjust the vibration reducing mechanism's drive amplitude accordingly. This closed-loop feedback ensures the vibration reduction is optimized for current operating conditions while minimizing unnecessary energy consumption
3Measurement precision
If mechanical detection mechanisms are used to detect load conditions and control the vibration reducing mechanism, then control accuracy is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent substitutes mechanical detection mechanisms (such as load cells, pressure sensors, or mechanical switches) with an electrical detection approach using motor current monitoring. The motor controller measures current variations that naturally occur with changing load conditions, providing accurate load detection through electrical parameters rather than mechanical sensors, thereby simplifying the device structure
Solution Approach 2:
The motor itself serves a dual function: it not only drives the hammering mechanism but also provides the detection signal through its current consumption. The motor controller leverages the existing electrical parameters of the motor operation to detect load conditions without requiring separate dedicated detection components, allowing the system to self-monitor its own operational state
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 solution effectively reduces vibration during hammering operations by adjusting the vibration reducing mechanism's drive based on load conditions, enhancing performance under both loaded and unloaded conditions without the need for mechanical detection mechanisms, thus simplifying the control system and improving overall vibration reduction efficiency.
Implementation Method 1
a motor controller that detects load conditions through motor current changes
Implementation Method 2
a vibration reducing mechanism that adjusts its amplitude, frequency, and phase to optimize vibration cancellation
Data Source
AI summary
An electric hammer comprising a hammer bit performing hammering work on a work, a drive motor, a hammering piece driven by the drive motor to apply a hammering force to the hammer bit, and a mechanism for damping vibration generated during hammering. The damping performance of the electric hammer is enhanced by causing the driving amount applied to the damping mechanism to vary between a first mode where the damping mechanism generates vibration of the hammer bit subjected to an external force from the work during the load driving time and thereby optimizes the damping and a second mode where the damping mechanism generates vibration corresponding to the vibration of the hammer bit not subjected to an external force from the work during the no-land driving time and optimizes damping.