Pneumatic Hammer Drill Air Trap Shock Absorption
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Solution Overview
Problem
Conventional pneumatic hammer drills experience component damage due to strong impact forces, lead to operator fatigue and hearing issues, and have complex assembly due to precise alignment requirements.
Innovation Solution
Incorporating an air trap arrangement with a protrusion and cavity between the piston and air valve to create a shock-absorbing air cushion, reducing impact forces and simplifying assembly by eliminating the need for precise alignment of air passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the piston rear end and front bearing end are made with flat surfaces for direct contact, then the structure is simple, but the impact force is strong causing component damage and operator injury
Solution Approach 1:
The patent introduces an air cushion as an intermediary between the piston rear end and front bearing end. This air cushion acts as a mediator that absorbs impact forces, preventing direct contact between the flat surfaces while reducing harmful impact effects on components and the operator.
Solution Approach 2:
The patent implements beforehand cushioning by creating an air cushion in advance between moving components. This pre-established cushioning layer absorbs impact energy before it can cause damage to components or injure the operator, resolving the contradiction between structural simplicity and impact force reduction.
2Manufacturing precision
If precise alignment of positioning holes and air passages is required, then air flow is controlled accurately, but assembly becomes complicated
Solution Approach 1:
The patent extracts the alignment requirement by removing the need for precise positioning hole alignment. The air passage is designed to communicate with the pressure chamber through the air valve body without requiring alignment with positioning holes, thereby simplifying assembly while maintaining air flow control functionality.
3Force
If strong impact force is generated for effective hammering, then drilling performance is improved, but operator fatigue and hearing damage occur
Solution Approach 1:
The air cushion serves as an intermediary that selectively absorbs harmful impact forces transmitted to the operator while allowing effective hammering forces to be generated at the tool interface. This resolves the contradiction by protecting the operator from excessive vibration and noise while maintaining drilling performance.
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 air trap arrangement reduces impact forces, enhances damping, and simplifies assembly by providing a shock-absorbing mechanism and eliminating alignment complexities.
Implementation Method 1
trap air between the piston rear end and the front bearing end and around the opening so as to provide a shock-absorbing air cushion when the piston rear end moves towards the front bearing end
Implementation Method 2
Highly compressed air is introduced into the air passage 1212 via the lower handgrip portion 11. The compressed air flows through the valve orifices 1311, 1323 from the air passage 1212 in the pneumatic cylinder 12, and enters a rear side of the pressure chamber 1211 so as to push forwardly the piston 123
Implementation Method 3
a spring element 122 engaged threadedly to the front end 1213, The tool 14 is restored to its original position through a restoring force of the spring element 122
Data Source
AI summary
A pneumatic hammer drill includes: a pneumatic cylinder having a cylinder rear end fitted in a handle body, an air passage, and a pressure chamber; and an air valve adjacent to the cylinder rear end. The air valve has a front bearing end, a valve orifice interconnecting fluidly the air passage and the pressure chamber, and an opening disposed at the front bearing end in communication with the valve orifice. A piston is disposed slidably in the pressure chamber, and has a piston rear end capable of moving towards or away from the front bearing end. An air trap arrangement is associated with the piston rear end and the front bearing end to trap air between the same and around the opening so as to provide a shock-absorbing air cushion when the piston rear end moves towards the front bearing end.