Hammer Drill Air Replenishment Mechanism for Material Adaptation
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Solution Overview
Problem
Existing hammer drills lack the ability to adjust performance characteristics based on the hardness of the material being cut, leading to suboptimal performance in varying conditions.
Innovation Solution
Incorporating an air replenishment mechanism that adjusts the timing and volume of air refreshment during the hammer cycle to optimize performance for different materials, using multiple bleed holes or a valve to control air flow, allowing for customizable air spring refreshment based on the material's hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single fixed air replenishment hole is used in the cylinder, then the device structure is simple, but the performance characteristics cannot be adjusted for different material hardness
Solution Approach 1:
The patent applies the dynamics principle by making the air replenishment system adjustable rather than fixed. The air replenishment hole can be positioned at different locations along the cylinder, and its size can be varied, allowing the system to adapt its characteristics based on material hardness. This transforms a static system into a dynamic one that can modify its behavior to suit different operating conditions.
Solution Approach 2:
The patent implements parameter changes by varying key parameters of the air replenishment mechanism, specifically the position and size of the air replenishment hole. By changing these parameters, the air spring compression characteristics are modified, which in turn adjusts the hammer's impact characteristics to match different material hardness levels.
2Productivity
If the air spring is refreshed at fixed timing during the hammer cycle, then the mechanism is simple, but the energy transfer efficiency cannot be optimized for different material hardness
Solution Approach 1:
The patent applies dynamics by enabling variable timing of air replenishment relative to the hammer cycle. The air replenishment can occur at different positions in the cylinder stroke, allowing optimization of energy transfer for different material hardness levels. This creates a dynamic control system that can adjust timing based on operational requirements.
Solution Approach 2:
The patent implements parameter changes by modifying the timing parameter of air replenishment within the hammer cycle. By adjusting when the air replenishment hole is accessed during the piston's reciprocating motion, the system optimizes the air spring's compression and rebound characteristics to maximize energy transfer efficiency for different materials.
3Adaptability or versatility
If the air replenishment hole position is fixed, then the manufacturing is simple, but the performance cannot be adapted to hard or soft materials
Solution Approach 1:
The patent applies segmentation by providing multiple discrete air replenishment hole positions along the cylinder rather than a single fixed position. This allows the system to offer distinct performance characteristics for different material hardness levels while maintaining a relatively simple manufacturing process for each individual hole position.
Solution Approach 2:
The patent implements parameter changes by varying the position parameter of the air replenishment hole along the cylinder length. By providing options at different positions, the system can adapt to different material hardness levels. The manufacturing complexity is managed by treating each position as a separate design option rather than requiring complex continuous adjustment mechanisms.
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 solution enables the hammer drill to adapt its performance characteristics to suit hard or soft materials, improving efficiency and effectiveness by adjusting the restitution coefficient, energy transfer, and air spring compression, thereby enhancing the overall cutting process.
Implementation Method 1
the reciprocating movement of the piston reciprocatingly driving the ram via an air spring to impart impacts to a cutting tool
Implementation Method 2
an air replenishment mechanism which is capable of refreshing the air spring during certain time periods within the hammer cycle
Data Source
AI summary
A hammer drill having a motor mounted within a body and an output spindle; a tool holder mounted on the body capable of holding a cutting tool; a hammer mechanism having a piston; a reciprocating drive for converting rotary movement of the motor into reciprocating movement of the piston; a ram reciprocatingly driven by the piston via an air spring to strike a cutting tool held in the tool holder, the hammer mechanism performing one hammer cycle each time the ram strikes a cutting tool during normal use; an air replenishment mechanism capable of refreshing the air spring during certain time periods during normal use; the air replenishment mechanism capable of being adjusted to refresh the air spring during time periods within the hammer cycle and/or the system allows different volumes of air into or out of the air spring during the refreshment time periods.