Pneumatic Hammer Mechanism Stroke Optimization
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Solution Overview
Problem
Existing electrically operated chipping hammers with pneumatic hammer mechanisms face a challenge in increasing impact effect without increasing power consumption, which is limited by ergonomic constraints and the need to balance kinetic energy and recoil force.
Innovation Solution
A pneumatic hammer mechanism with a flying mass that moves along an impact axis, featuring an impact surface and an exciting piston with a pneumatic chamber, where the stroke is optimized to achieve a higher velocity during the first phase of movement and deceleration during the second phase, allowing for intermittent standstill and increased impact effect without increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the stroke H of the hammer piston is increased to increase kinetic energy, then the impact effect is improved, but the maximum length of the pneumatic chamber must be increased resulting in a longer hammer mechanism
Solution Approach 1:
The patent applies dynamics by making the stroke H variable rather than fixed. The stroke is dynamically adjusted based on the operational mode (impact mode vs. chipping mode) and the current position of the flying mass within the pneumatic chamber. This allows optimization of kinetic energy generation without requiring a longer mechanical structure, as the effective stroke adapts to the actual working conditions.
Solution Approach 2:
The patent changes the parameter of stroke length H dynamically. By varying the stroke from a first value in impact mode to a second value in chipping mode, and adjusting it based on the flying mass position, the system optimizes performance without increasing the physical length of the hammer mechanism. This parameter change allows the same structure to achieve different performance levels.
2Productivity
If the angular velocity of the hammer piston is increased to increase impact frequency, then productivity is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the stroke H based on the operational mode and flying mass position, which optimizes the balance between impact frequency and power consumption. By varying the stroke rather than maintaining a fixed high angular velocity, the system achieves productive impact frequencies while reducing overall power consumption requirements.
3Power
If the mass of the flying mass is increased to increase kinetic energy, then impact effect is improved, but the recoil force during acceleration increases
Solution Approach 1:
Instead of increasing the mass of the flying mass, the patent changes the parameter of stroke H to optimize kinetic energy generation. By adjusting the stroke length dynamically, the system achieves sufficient kinetic energy with the existing flying mass, thereby avoiding excessive recoil forces that would result from using a heavier flying mass.
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 enhances the impact effect of the chipping hammer while maintaining ergonomic considerations by optimizing the movement phases and pressure changes within the pneumatic chamber, allowing for a higher velocity and increased kinetic energy transfer without increasing power consumption.
Implementation Method 1
The pneumatic chamber 580 is heavily compressed in the process and as a result accelerates the flying mass 569 in the direction of the tool 599
Implementation Method 2
A deceleration of the flying mass 569 is produced by an excess pressure or underpressure in the pneumatic chamber 580
Data Source
AI summary
A pneumatic hammer mechanism is disclosed. The hammer mechanism features: a flying mass, which is movable along an impact axis; an impact surface, which limits a movement of the flying mass along the impact axis in the impact direction; an exciting piston, which limits a movement of the flying mass along the impact axis opposite from the impact direction; a pneumatic chamber between the flying mass and exciting piston; a drive for periodically moving the exciting piston with a stroke along the impact axis, wherein the flying mass is excited to a periodic movement between the impact surface and exciting piston. The stroke is selected as a function of a maximum length of the pneumatic chamber such that the periodic movement of the flying mass on the path between an impact on the impact surface and a minimum approach of the exciting piston intermittently has a velocity of zero.